Loading...
1/* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * refcounttree.c
5 *
6 * Copyright (C) 2009 Oracle. All rights reserved.
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public
10 * License version 2 as published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 */
17
18#include <linux/sort.h>
19#include <cluster/masklog.h>
20#include "ocfs2.h"
21#include "inode.h"
22#include "alloc.h"
23#include "suballoc.h"
24#include "journal.h"
25#include "uptodate.h"
26#include "super.h"
27#include "buffer_head_io.h"
28#include "blockcheck.h"
29#include "refcounttree.h"
30#include "sysfile.h"
31#include "dlmglue.h"
32#include "extent_map.h"
33#include "aops.h"
34#include "xattr.h"
35#include "namei.h"
36#include "ocfs2_trace.h"
37#include "file.h"
38
39#include <linux/bio.h>
40#include <linux/blkdev.h>
41#include <linux/slab.h>
42#include <linux/writeback.h>
43#include <linux/pagevec.h>
44#include <linux/swap.h>
45#include <linux/security.h>
46#include <linux/fsnotify.h>
47#include <linux/quotaops.h>
48#include <linux/namei.h>
49#include <linux/mount.h>
50#include <linux/posix_acl.h>
51
52struct ocfs2_cow_context {
53 struct inode *inode;
54 u32 cow_start;
55 u32 cow_len;
56 struct ocfs2_extent_tree data_et;
57 struct ocfs2_refcount_tree *ref_tree;
58 struct buffer_head *ref_root_bh;
59 struct ocfs2_alloc_context *meta_ac;
60 struct ocfs2_alloc_context *data_ac;
61 struct ocfs2_cached_dealloc_ctxt dealloc;
62 void *cow_object;
63 struct ocfs2_post_refcount *post_refcount;
64 int extra_credits;
65 int (*get_clusters)(struct ocfs2_cow_context *context,
66 u32 v_cluster, u32 *p_cluster,
67 u32 *num_clusters,
68 unsigned int *extent_flags);
69 int (*cow_duplicate_clusters)(handle_t *handle,
70 struct inode *inode,
71 u32 cpos, u32 old_cluster,
72 u32 new_cluster, u32 new_len);
73};
74
75static inline struct ocfs2_refcount_tree *
76cache_info_to_refcount(struct ocfs2_caching_info *ci)
77{
78 return container_of(ci, struct ocfs2_refcount_tree, rf_ci);
79}
80
81static int ocfs2_validate_refcount_block(struct super_block *sb,
82 struct buffer_head *bh)
83{
84 int rc;
85 struct ocfs2_refcount_block *rb =
86 (struct ocfs2_refcount_block *)bh->b_data;
87
88 trace_ocfs2_validate_refcount_block((unsigned long long)bh->b_blocknr);
89
90 BUG_ON(!buffer_uptodate(bh));
91
92 /*
93 * If the ecc fails, we return the error but otherwise
94 * leave the filesystem running. We know any error is
95 * local to this block.
96 */
97 rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &rb->rf_check);
98 if (rc) {
99 mlog(ML_ERROR, "Checksum failed for refcount block %llu\n",
100 (unsigned long long)bh->b_blocknr);
101 return rc;
102 }
103
104
105 if (!OCFS2_IS_VALID_REFCOUNT_BLOCK(rb)) {
106 rc = ocfs2_error(sb,
107 "Refcount block #%llu has bad signature %.*s\n",
108 (unsigned long long)bh->b_blocknr, 7,
109 rb->rf_signature);
110 goto out;
111 }
112
113 if (le64_to_cpu(rb->rf_blkno) != bh->b_blocknr) {
114 rc = ocfs2_error(sb,
115 "Refcount block #%llu has an invalid rf_blkno of %llu\n",
116 (unsigned long long)bh->b_blocknr,
117 (unsigned long long)le64_to_cpu(rb->rf_blkno));
118 goto out;
119 }
120
121 if (le32_to_cpu(rb->rf_fs_generation) != OCFS2_SB(sb)->fs_generation) {
122 rc = ocfs2_error(sb,
123 "Refcount block #%llu has an invalid rf_fs_generation of #%u\n",
124 (unsigned long long)bh->b_blocknr,
125 le32_to_cpu(rb->rf_fs_generation));
126 goto out;
127 }
128out:
129 return rc;
130}
131
132static int ocfs2_read_refcount_block(struct ocfs2_caching_info *ci,
133 u64 rb_blkno,
134 struct buffer_head **bh)
135{
136 int rc;
137 struct buffer_head *tmp = *bh;
138
139 rc = ocfs2_read_block(ci, rb_blkno, &tmp,
140 ocfs2_validate_refcount_block);
141
142 /* If ocfs2_read_block() got us a new bh, pass it up. */
143 if (!rc && !*bh)
144 *bh = tmp;
145
146 return rc;
147}
148
149static u64 ocfs2_refcount_cache_owner(struct ocfs2_caching_info *ci)
150{
151 struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci);
152
153 return rf->rf_blkno;
154}
155
156static struct super_block *
157ocfs2_refcount_cache_get_super(struct ocfs2_caching_info *ci)
158{
159 struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci);
160
161 return rf->rf_sb;
162}
163
164static void ocfs2_refcount_cache_lock(struct ocfs2_caching_info *ci)
165{
166 struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci);
167
168 spin_lock(&rf->rf_lock);
169}
170
171static void ocfs2_refcount_cache_unlock(struct ocfs2_caching_info *ci)
172{
173 struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci);
174
175 spin_unlock(&rf->rf_lock);
176}
177
178static void ocfs2_refcount_cache_io_lock(struct ocfs2_caching_info *ci)
179{
180 struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci);
181
182 mutex_lock(&rf->rf_io_mutex);
183}
184
185static void ocfs2_refcount_cache_io_unlock(struct ocfs2_caching_info *ci)
186{
187 struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci);
188
189 mutex_unlock(&rf->rf_io_mutex);
190}
191
192static const struct ocfs2_caching_operations ocfs2_refcount_caching_ops = {
193 .co_owner = ocfs2_refcount_cache_owner,
194 .co_get_super = ocfs2_refcount_cache_get_super,
195 .co_cache_lock = ocfs2_refcount_cache_lock,
196 .co_cache_unlock = ocfs2_refcount_cache_unlock,
197 .co_io_lock = ocfs2_refcount_cache_io_lock,
198 .co_io_unlock = ocfs2_refcount_cache_io_unlock,
199};
200
201static struct ocfs2_refcount_tree *
202ocfs2_find_refcount_tree(struct ocfs2_super *osb, u64 blkno)
203{
204 struct rb_node *n = osb->osb_rf_lock_tree.rb_node;
205 struct ocfs2_refcount_tree *tree = NULL;
206
207 while (n) {
208 tree = rb_entry(n, struct ocfs2_refcount_tree, rf_node);
209
210 if (blkno < tree->rf_blkno)
211 n = n->rb_left;
212 else if (blkno > tree->rf_blkno)
213 n = n->rb_right;
214 else
215 return tree;
216 }
217
218 return NULL;
219}
220
221/* osb_lock is already locked. */
222static void ocfs2_insert_refcount_tree(struct ocfs2_super *osb,
223 struct ocfs2_refcount_tree *new)
224{
225 u64 rf_blkno = new->rf_blkno;
226 struct rb_node *parent = NULL;
227 struct rb_node **p = &osb->osb_rf_lock_tree.rb_node;
228 struct ocfs2_refcount_tree *tmp;
229
230 while (*p) {
231 parent = *p;
232
233 tmp = rb_entry(parent, struct ocfs2_refcount_tree,
234 rf_node);
235
236 if (rf_blkno < tmp->rf_blkno)
237 p = &(*p)->rb_left;
238 else if (rf_blkno > tmp->rf_blkno)
239 p = &(*p)->rb_right;
240 else {
241 /* This should never happen! */
242 mlog(ML_ERROR, "Duplicate refcount block %llu found!\n",
243 (unsigned long long)rf_blkno);
244 BUG();
245 }
246 }
247
248 rb_link_node(&new->rf_node, parent, p);
249 rb_insert_color(&new->rf_node, &osb->osb_rf_lock_tree);
250}
251
252static void ocfs2_free_refcount_tree(struct ocfs2_refcount_tree *tree)
253{
254 ocfs2_metadata_cache_exit(&tree->rf_ci);
255 ocfs2_simple_drop_lockres(OCFS2_SB(tree->rf_sb), &tree->rf_lockres);
256 ocfs2_lock_res_free(&tree->rf_lockres);
257 kfree(tree);
258}
259
260static inline void
261ocfs2_erase_refcount_tree_from_list_no_lock(struct ocfs2_super *osb,
262 struct ocfs2_refcount_tree *tree)
263{
264 rb_erase(&tree->rf_node, &osb->osb_rf_lock_tree);
265 if (osb->osb_ref_tree_lru && osb->osb_ref_tree_lru == tree)
266 osb->osb_ref_tree_lru = NULL;
267}
268
269static void ocfs2_erase_refcount_tree_from_list(struct ocfs2_super *osb,
270 struct ocfs2_refcount_tree *tree)
271{
272 spin_lock(&osb->osb_lock);
273 ocfs2_erase_refcount_tree_from_list_no_lock(osb, tree);
274 spin_unlock(&osb->osb_lock);
275}
276
277static void ocfs2_kref_remove_refcount_tree(struct kref *kref)
278{
279 struct ocfs2_refcount_tree *tree =
280 container_of(kref, struct ocfs2_refcount_tree, rf_getcnt);
281
282 ocfs2_free_refcount_tree(tree);
283}
284
285static inline void
286ocfs2_refcount_tree_get(struct ocfs2_refcount_tree *tree)
287{
288 kref_get(&tree->rf_getcnt);
289}
290
291static inline void
292ocfs2_refcount_tree_put(struct ocfs2_refcount_tree *tree)
293{
294 kref_put(&tree->rf_getcnt, ocfs2_kref_remove_refcount_tree);
295}
296
297static inline void ocfs2_init_refcount_tree_ci(struct ocfs2_refcount_tree *new,
298 struct super_block *sb)
299{
300 ocfs2_metadata_cache_init(&new->rf_ci, &ocfs2_refcount_caching_ops);
301 mutex_init(&new->rf_io_mutex);
302 new->rf_sb = sb;
303 spin_lock_init(&new->rf_lock);
304}
305
306static inline void ocfs2_init_refcount_tree_lock(struct ocfs2_super *osb,
307 struct ocfs2_refcount_tree *new,
308 u64 rf_blkno, u32 generation)
309{
310 init_rwsem(&new->rf_sem);
311 ocfs2_refcount_lock_res_init(&new->rf_lockres, osb,
312 rf_blkno, generation);
313}
314
315static struct ocfs2_refcount_tree*
316ocfs2_allocate_refcount_tree(struct ocfs2_super *osb, u64 rf_blkno)
317{
318 struct ocfs2_refcount_tree *new;
319
320 new = kzalloc(sizeof(struct ocfs2_refcount_tree), GFP_NOFS);
321 if (!new)
322 return NULL;
323
324 new->rf_blkno = rf_blkno;
325 kref_init(&new->rf_getcnt);
326 ocfs2_init_refcount_tree_ci(new, osb->sb);
327
328 return new;
329}
330
331static int ocfs2_get_refcount_tree(struct ocfs2_super *osb, u64 rf_blkno,
332 struct ocfs2_refcount_tree **ret_tree)
333{
334 int ret = 0;
335 struct ocfs2_refcount_tree *tree, *new = NULL;
336 struct buffer_head *ref_root_bh = NULL;
337 struct ocfs2_refcount_block *ref_rb;
338
339 spin_lock(&osb->osb_lock);
340 if (osb->osb_ref_tree_lru &&
341 osb->osb_ref_tree_lru->rf_blkno == rf_blkno)
342 tree = osb->osb_ref_tree_lru;
343 else
344 tree = ocfs2_find_refcount_tree(osb, rf_blkno);
345 if (tree)
346 goto out;
347
348 spin_unlock(&osb->osb_lock);
349
350 new = ocfs2_allocate_refcount_tree(osb, rf_blkno);
351 if (!new) {
352 ret = -ENOMEM;
353 mlog_errno(ret);
354 return ret;
355 }
356 /*
357 * We need the generation to create the refcount tree lock and since
358 * it isn't changed during the tree modification, we are safe here to
359 * read without protection.
360 * We also have to purge the cache after we create the lock since the
361 * refcount block may have the stale data. It can only be trusted when
362 * we hold the refcount lock.
363 */
364 ret = ocfs2_read_refcount_block(&new->rf_ci, rf_blkno, &ref_root_bh);
365 if (ret) {
366 mlog_errno(ret);
367 ocfs2_metadata_cache_exit(&new->rf_ci);
368 kfree(new);
369 return ret;
370 }
371
372 ref_rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
373 new->rf_generation = le32_to_cpu(ref_rb->rf_generation);
374 ocfs2_init_refcount_tree_lock(osb, new, rf_blkno,
375 new->rf_generation);
376 ocfs2_metadata_cache_purge(&new->rf_ci);
377
378 spin_lock(&osb->osb_lock);
379 tree = ocfs2_find_refcount_tree(osb, rf_blkno);
380 if (tree)
381 goto out;
382
383 ocfs2_insert_refcount_tree(osb, new);
384
385 tree = new;
386 new = NULL;
387
388out:
389 *ret_tree = tree;
390
391 osb->osb_ref_tree_lru = tree;
392
393 spin_unlock(&osb->osb_lock);
394
395 if (new)
396 ocfs2_free_refcount_tree(new);
397
398 brelse(ref_root_bh);
399 return ret;
400}
401
402static int ocfs2_get_refcount_block(struct inode *inode, u64 *ref_blkno)
403{
404 int ret;
405 struct buffer_head *di_bh = NULL;
406 struct ocfs2_dinode *di;
407
408 ret = ocfs2_read_inode_block(inode, &di_bh);
409 if (ret) {
410 mlog_errno(ret);
411 goto out;
412 }
413
414 BUG_ON(!ocfs2_is_refcount_inode(inode));
415
416 di = (struct ocfs2_dinode *)di_bh->b_data;
417 *ref_blkno = le64_to_cpu(di->i_refcount_loc);
418 brelse(di_bh);
419out:
420 return ret;
421}
422
423static int __ocfs2_lock_refcount_tree(struct ocfs2_super *osb,
424 struct ocfs2_refcount_tree *tree, int rw)
425{
426 int ret;
427
428 ret = ocfs2_refcount_lock(tree, rw);
429 if (ret) {
430 mlog_errno(ret);
431 goto out;
432 }
433
434 if (rw)
435 down_write(&tree->rf_sem);
436 else
437 down_read(&tree->rf_sem);
438
439out:
440 return ret;
441}
442
443/*
444 * Lock the refcount tree pointed by ref_blkno and return the tree.
445 * In most case, we lock the tree and read the refcount block.
446 * So read it here if the caller really needs it.
447 *
448 * If the tree has been re-created by other node, it will free the
449 * old one and re-create it.
450 */
451int ocfs2_lock_refcount_tree(struct ocfs2_super *osb,
452 u64 ref_blkno, int rw,
453 struct ocfs2_refcount_tree **ret_tree,
454 struct buffer_head **ref_bh)
455{
456 int ret, delete_tree = 0;
457 struct ocfs2_refcount_tree *tree = NULL;
458 struct buffer_head *ref_root_bh = NULL;
459 struct ocfs2_refcount_block *rb;
460
461again:
462 ret = ocfs2_get_refcount_tree(osb, ref_blkno, &tree);
463 if (ret) {
464 mlog_errno(ret);
465 return ret;
466 }
467
468 ocfs2_refcount_tree_get(tree);
469
470 ret = __ocfs2_lock_refcount_tree(osb, tree, rw);
471 if (ret) {
472 mlog_errno(ret);
473 ocfs2_refcount_tree_put(tree);
474 goto out;
475 }
476
477 ret = ocfs2_read_refcount_block(&tree->rf_ci, tree->rf_blkno,
478 &ref_root_bh);
479 if (ret) {
480 mlog_errno(ret);
481 ocfs2_unlock_refcount_tree(osb, tree, rw);
482 goto out;
483 }
484
485 rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
486 /*
487 * If the refcount block has been freed and re-created, we may need
488 * to recreate the refcount tree also.
489 *
490 * Here we just remove the tree from the rb-tree, and the last
491 * kref holder will unlock and delete this refcount_tree.
492 * Then we goto "again" and ocfs2_get_refcount_tree will create
493 * the new refcount tree for us.
494 */
495 if (tree->rf_generation != le32_to_cpu(rb->rf_generation)) {
496 if (!tree->rf_removed) {
497 ocfs2_erase_refcount_tree_from_list(osb, tree);
498 tree->rf_removed = 1;
499 delete_tree = 1;
500 }
501
502 ocfs2_unlock_refcount_tree(osb, tree, rw);
503 /*
504 * We get an extra reference when we create the refcount
505 * tree, so another put will destroy it.
506 */
507 if (delete_tree)
508 ocfs2_refcount_tree_put(tree);
509 brelse(ref_root_bh);
510 ref_root_bh = NULL;
511 goto again;
512 }
513
514 *ret_tree = tree;
515 if (ref_bh) {
516 *ref_bh = ref_root_bh;
517 ref_root_bh = NULL;
518 }
519out:
520 brelse(ref_root_bh);
521 return ret;
522}
523
524void ocfs2_unlock_refcount_tree(struct ocfs2_super *osb,
525 struct ocfs2_refcount_tree *tree, int rw)
526{
527 if (rw)
528 up_write(&tree->rf_sem);
529 else
530 up_read(&tree->rf_sem);
531
532 ocfs2_refcount_unlock(tree, rw);
533 ocfs2_refcount_tree_put(tree);
534}
535
536void ocfs2_purge_refcount_trees(struct ocfs2_super *osb)
537{
538 struct rb_node *node;
539 struct ocfs2_refcount_tree *tree;
540 struct rb_root *root = &osb->osb_rf_lock_tree;
541
542 while ((node = rb_last(root)) != NULL) {
543 tree = rb_entry(node, struct ocfs2_refcount_tree, rf_node);
544
545 trace_ocfs2_purge_refcount_trees(
546 (unsigned long long) tree->rf_blkno);
547
548 rb_erase(&tree->rf_node, root);
549 ocfs2_free_refcount_tree(tree);
550 }
551}
552
553/*
554 * Create a refcount tree for an inode.
555 * We take for granted that the inode is already locked.
556 */
557static int ocfs2_create_refcount_tree(struct inode *inode,
558 struct buffer_head *di_bh)
559{
560 int ret;
561 handle_t *handle = NULL;
562 struct ocfs2_alloc_context *meta_ac = NULL;
563 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
564 struct ocfs2_inode_info *oi = OCFS2_I(inode);
565 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
566 struct buffer_head *new_bh = NULL;
567 struct ocfs2_refcount_block *rb;
568 struct ocfs2_refcount_tree *new_tree = NULL, *tree = NULL;
569 u16 suballoc_bit_start;
570 u32 num_got;
571 u64 suballoc_loc, first_blkno;
572
573 BUG_ON(ocfs2_is_refcount_inode(inode));
574
575 trace_ocfs2_create_refcount_tree(
576 (unsigned long long)OCFS2_I(inode)->ip_blkno);
577
578 ret = ocfs2_reserve_new_metadata_blocks(osb, 1, &meta_ac);
579 if (ret) {
580 mlog_errno(ret);
581 goto out;
582 }
583
584 handle = ocfs2_start_trans(osb, OCFS2_REFCOUNT_TREE_CREATE_CREDITS);
585 if (IS_ERR(handle)) {
586 ret = PTR_ERR(handle);
587 mlog_errno(ret);
588 goto out;
589 }
590
591 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
592 OCFS2_JOURNAL_ACCESS_WRITE);
593 if (ret) {
594 mlog_errno(ret);
595 goto out_commit;
596 }
597
598 ret = ocfs2_claim_metadata(handle, meta_ac, 1, &suballoc_loc,
599 &suballoc_bit_start, &num_got,
600 &first_blkno);
601 if (ret) {
602 mlog_errno(ret);
603 goto out_commit;
604 }
605
606 new_tree = ocfs2_allocate_refcount_tree(osb, first_blkno);
607 if (!new_tree) {
608 ret = -ENOMEM;
609 mlog_errno(ret);
610 goto out_commit;
611 }
612
613 new_bh = sb_getblk(inode->i_sb, first_blkno);
614 if (!new_bh) {
615 ret = -ENOMEM;
616 mlog_errno(ret);
617 goto out_commit;
618 }
619 ocfs2_set_new_buffer_uptodate(&new_tree->rf_ci, new_bh);
620
621 ret = ocfs2_journal_access_rb(handle, &new_tree->rf_ci, new_bh,
622 OCFS2_JOURNAL_ACCESS_CREATE);
623 if (ret) {
624 mlog_errno(ret);
625 goto out_commit;
626 }
627
628 /* Initialize ocfs2_refcount_block. */
629 rb = (struct ocfs2_refcount_block *)new_bh->b_data;
630 memset(rb, 0, inode->i_sb->s_blocksize);
631 strcpy((void *)rb, OCFS2_REFCOUNT_BLOCK_SIGNATURE);
632 rb->rf_suballoc_slot = cpu_to_le16(meta_ac->ac_alloc_slot);
633 rb->rf_suballoc_loc = cpu_to_le64(suballoc_loc);
634 rb->rf_suballoc_bit = cpu_to_le16(suballoc_bit_start);
635 rb->rf_fs_generation = cpu_to_le32(osb->fs_generation);
636 rb->rf_blkno = cpu_to_le64(first_blkno);
637 rb->rf_count = cpu_to_le32(1);
638 rb->rf_records.rl_count =
639 cpu_to_le16(ocfs2_refcount_recs_per_rb(osb->sb));
640 spin_lock(&osb->osb_lock);
641 rb->rf_generation = osb->s_next_generation++;
642 spin_unlock(&osb->osb_lock);
643
644 ocfs2_journal_dirty(handle, new_bh);
645
646 spin_lock(&oi->ip_lock);
647 oi->ip_dyn_features |= OCFS2_HAS_REFCOUNT_FL;
648 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
649 di->i_refcount_loc = cpu_to_le64(first_blkno);
650 spin_unlock(&oi->ip_lock);
651
652 trace_ocfs2_create_refcount_tree_blkno((unsigned long long)first_blkno);
653
654 ocfs2_journal_dirty(handle, di_bh);
655
656 /*
657 * We have to init the tree lock here since it will use
658 * the generation number to create it.
659 */
660 new_tree->rf_generation = le32_to_cpu(rb->rf_generation);
661 ocfs2_init_refcount_tree_lock(osb, new_tree, first_blkno,
662 new_tree->rf_generation);
663
664 spin_lock(&osb->osb_lock);
665 tree = ocfs2_find_refcount_tree(osb, first_blkno);
666
667 /*
668 * We've just created a new refcount tree in this block. If
669 * we found a refcount tree on the ocfs2_super, it must be
670 * one we just deleted. We free the old tree before
671 * inserting the new tree.
672 */
673 BUG_ON(tree && tree->rf_generation == new_tree->rf_generation);
674 if (tree)
675 ocfs2_erase_refcount_tree_from_list_no_lock(osb, tree);
676 ocfs2_insert_refcount_tree(osb, new_tree);
677 spin_unlock(&osb->osb_lock);
678 new_tree = NULL;
679 if (tree)
680 ocfs2_refcount_tree_put(tree);
681
682out_commit:
683 ocfs2_commit_trans(osb, handle);
684
685out:
686 if (new_tree) {
687 ocfs2_metadata_cache_exit(&new_tree->rf_ci);
688 kfree(new_tree);
689 }
690
691 brelse(new_bh);
692 if (meta_ac)
693 ocfs2_free_alloc_context(meta_ac);
694
695 return ret;
696}
697
698static int ocfs2_set_refcount_tree(struct inode *inode,
699 struct buffer_head *di_bh,
700 u64 refcount_loc)
701{
702 int ret;
703 handle_t *handle = NULL;
704 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
705 struct ocfs2_inode_info *oi = OCFS2_I(inode);
706 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
707 struct buffer_head *ref_root_bh = NULL;
708 struct ocfs2_refcount_block *rb;
709 struct ocfs2_refcount_tree *ref_tree;
710
711 BUG_ON(ocfs2_is_refcount_inode(inode));
712
713 ret = ocfs2_lock_refcount_tree(osb, refcount_loc, 1,
714 &ref_tree, &ref_root_bh);
715 if (ret) {
716 mlog_errno(ret);
717 return ret;
718 }
719
720 handle = ocfs2_start_trans(osb, OCFS2_REFCOUNT_TREE_SET_CREDITS);
721 if (IS_ERR(handle)) {
722 ret = PTR_ERR(handle);
723 mlog_errno(ret);
724 goto out;
725 }
726
727 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
728 OCFS2_JOURNAL_ACCESS_WRITE);
729 if (ret) {
730 mlog_errno(ret);
731 goto out_commit;
732 }
733
734 ret = ocfs2_journal_access_rb(handle, &ref_tree->rf_ci, ref_root_bh,
735 OCFS2_JOURNAL_ACCESS_WRITE);
736 if (ret) {
737 mlog_errno(ret);
738 goto out_commit;
739 }
740
741 rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
742 le32_add_cpu(&rb->rf_count, 1);
743
744 ocfs2_journal_dirty(handle, ref_root_bh);
745
746 spin_lock(&oi->ip_lock);
747 oi->ip_dyn_features |= OCFS2_HAS_REFCOUNT_FL;
748 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
749 di->i_refcount_loc = cpu_to_le64(refcount_loc);
750 spin_unlock(&oi->ip_lock);
751 ocfs2_journal_dirty(handle, di_bh);
752
753out_commit:
754 ocfs2_commit_trans(osb, handle);
755out:
756 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
757 brelse(ref_root_bh);
758
759 return ret;
760}
761
762int ocfs2_remove_refcount_tree(struct inode *inode, struct buffer_head *di_bh)
763{
764 int ret, delete_tree = 0;
765 handle_t *handle = NULL;
766 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
767 struct ocfs2_inode_info *oi = OCFS2_I(inode);
768 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
769 struct ocfs2_refcount_block *rb;
770 struct inode *alloc_inode = NULL;
771 struct buffer_head *alloc_bh = NULL;
772 struct buffer_head *blk_bh = NULL;
773 struct ocfs2_refcount_tree *ref_tree;
774 int credits = OCFS2_REFCOUNT_TREE_REMOVE_CREDITS;
775 u64 blk = 0, bg_blkno = 0, ref_blkno = le64_to_cpu(di->i_refcount_loc);
776 u16 bit = 0;
777
778 if (!ocfs2_is_refcount_inode(inode))
779 return 0;
780
781 BUG_ON(!ref_blkno);
782 ret = ocfs2_lock_refcount_tree(osb, ref_blkno, 1, &ref_tree, &blk_bh);
783 if (ret) {
784 mlog_errno(ret);
785 return ret;
786 }
787
788 rb = (struct ocfs2_refcount_block *)blk_bh->b_data;
789
790 /*
791 * If we are the last user, we need to free the block.
792 * So lock the allocator ahead.
793 */
794 if (le32_to_cpu(rb->rf_count) == 1) {
795 blk = le64_to_cpu(rb->rf_blkno);
796 bit = le16_to_cpu(rb->rf_suballoc_bit);
797 if (rb->rf_suballoc_loc)
798 bg_blkno = le64_to_cpu(rb->rf_suballoc_loc);
799 else
800 bg_blkno = ocfs2_which_suballoc_group(blk, bit);
801
802 alloc_inode = ocfs2_get_system_file_inode(osb,
803 EXTENT_ALLOC_SYSTEM_INODE,
804 le16_to_cpu(rb->rf_suballoc_slot));
805 if (!alloc_inode) {
806 ret = -ENOMEM;
807 mlog_errno(ret);
808 goto out;
809 }
810 inode_lock(alloc_inode);
811
812 ret = ocfs2_inode_lock(alloc_inode, &alloc_bh, 1);
813 if (ret) {
814 mlog_errno(ret);
815 goto out_mutex;
816 }
817
818 credits += OCFS2_SUBALLOC_FREE;
819 }
820
821 handle = ocfs2_start_trans(osb, credits);
822 if (IS_ERR(handle)) {
823 ret = PTR_ERR(handle);
824 mlog_errno(ret);
825 goto out_unlock;
826 }
827
828 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
829 OCFS2_JOURNAL_ACCESS_WRITE);
830 if (ret) {
831 mlog_errno(ret);
832 goto out_commit;
833 }
834
835 ret = ocfs2_journal_access_rb(handle, &ref_tree->rf_ci, blk_bh,
836 OCFS2_JOURNAL_ACCESS_WRITE);
837 if (ret) {
838 mlog_errno(ret);
839 goto out_commit;
840 }
841
842 spin_lock(&oi->ip_lock);
843 oi->ip_dyn_features &= ~OCFS2_HAS_REFCOUNT_FL;
844 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
845 di->i_refcount_loc = 0;
846 spin_unlock(&oi->ip_lock);
847 ocfs2_journal_dirty(handle, di_bh);
848
849 le32_add_cpu(&rb->rf_count , -1);
850 ocfs2_journal_dirty(handle, blk_bh);
851
852 if (!rb->rf_count) {
853 delete_tree = 1;
854 ocfs2_erase_refcount_tree_from_list(osb, ref_tree);
855 ret = ocfs2_free_suballoc_bits(handle, alloc_inode,
856 alloc_bh, bit, bg_blkno, 1);
857 if (ret)
858 mlog_errno(ret);
859 }
860
861out_commit:
862 ocfs2_commit_trans(osb, handle);
863out_unlock:
864 if (alloc_inode) {
865 ocfs2_inode_unlock(alloc_inode, 1);
866 brelse(alloc_bh);
867 }
868out_mutex:
869 if (alloc_inode) {
870 inode_unlock(alloc_inode);
871 iput(alloc_inode);
872 }
873out:
874 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
875 if (delete_tree)
876 ocfs2_refcount_tree_put(ref_tree);
877 brelse(blk_bh);
878
879 return ret;
880}
881
882static void ocfs2_find_refcount_rec_in_rl(struct ocfs2_caching_info *ci,
883 struct buffer_head *ref_leaf_bh,
884 u64 cpos, unsigned int len,
885 struct ocfs2_refcount_rec *ret_rec,
886 int *index)
887{
888 int i = 0;
889 struct ocfs2_refcount_block *rb =
890 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
891 struct ocfs2_refcount_rec *rec = NULL;
892
893 for (; i < le16_to_cpu(rb->rf_records.rl_used); i++) {
894 rec = &rb->rf_records.rl_recs[i];
895
896 if (le64_to_cpu(rec->r_cpos) +
897 le32_to_cpu(rec->r_clusters) <= cpos)
898 continue;
899 else if (le64_to_cpu(rec->r_cpos) > cpos)
900 break;
901
902 /* ok, cpos fail in this rec. Just return. */
903 if (ret_rec)
904 *ret_rec = *rec;
905 goto out;
906 }
907
908 if (ret_rec) {
909 /* We meet with a hole here, so fake the rec. */
910 ret_rec->r_cpos = cpu_to_le64(cpos);
911 ret_rec->r_refcount = 0;
912 if (i < le16_to_cpu(rb->rf_records.rl_used) &&
913 le64_to_cpu(rec->r_cpos) < cpos + len)
914 ret_rec->r_clusters =
915 cpu_to_le32(le64_to_cpu(rec->r_cpos) - cpos);
916 else
917 ret_rec->r_clusters = cpu_to_le32(len);
918 }
919
920out:
921 *index = i;
922}
923
924/*
925 * Try to remove refcount tree. The mechanism is:
926 * 1) Check whether i_clusters == 0, if no, exit.
927 * 2) check whether we have i_xattr_loc in dinode. if yes, exit.
928 * 3) Check whether we have inline xattr stored outside, if yes, exit.
929 * 4) Remove the tree.
930 */
931int ocfs2_try_remove_refcount_tree(struct inode *inode,
932 struct buffer_head *di_bh)
933{
934 int ret;
935 struct ocfs2_inode_info *oi = OCFS2_I(inode);
936 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
937
938 down_write(&oi->ip_xattr_sem);
939 down_write(&oi->ip_alloc_sem);
940
941 if (oi->ip_clusters)
942 goto out;
943
944 if ((oi->ip_dyn_features & OCFS2_HAS_XATTR_FL) && di->i_xattr_loc)
945 goto out;
946
947 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL &&
948 ocfs2_has_inline_xattr_value_outside(inode, di))
949 goto out;
950
951 ret = ocfs2_remove_refcount_tree(inode, di_bh);
952 if (ret)
953 mlog_errno(ret);
954out:
955 up_write(&oi->ip_alloc_sem);
956 up_write(&oi->ip_xattr_sem);
957 return 0;
958}
959
960/*
961 * Find the end range for a leaf refcount block indicated by
962 * el->l_recs[index].e_blkno.
963 */
964static int ocfs2_get_refcount_cpos_end(struct ocfs2_caching_info *ci,
965 struct buffer_head *ref_root_bh,
966 struct ocfs2_extent_block *eb,
967 struct ocfs2_extent_list *el,
968 int index, u32 *cpos_end)
969{
970 int ret, i, subtree_root;
971 u32 cpos;
972 u64 blkno;
973 struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
974 struct ocfs2_path *left_path = NULL, *right_path = NULL;
975 struct ocfs2_extent_tree et;
976 struct ocfs2_extent_list *tmp_el;
977
978 if (index < le16_to_cpu(el->l_next_free_rec) - 1) {
979 /*
980 * We have a extent rec after index, so just use the e_cpos
981 * of the next extent rec.
982 */
983 *cpos_end = le32_to_cpu(el->l_recs[index+1].e_cpos);
984 return 0;
985 }
986
987 if (!eb || (eb && !eb->h_next_leaf_blk)) {
988 /*
989 * We are the last extent rec, so any high cpos should
990 * be stored in this leaf refcount block.
991 */
992 *cpos_end = UINT_MAX;
993 return 0;
994 }
995
996 /*
997 * If the extent block isn't the last one, we have to find
998 * the subtree root between this extent block and the next
999 * leaf extent block and get the corresponding e_cpos from
1000 * the subroot. Otherwise we may corrupt the b-tree.
1001 */
1002 ocfs2_init_refcount_extent_tree(&et, ci, ref_root_bh);
1003
1004 left_path = ocfs2_new_path_from_et(&et);
1005 if (!left_path) {
1006 ret = -ENOMEM;
1007 mlog_errno(ret);
1008 goto out;
1009 }
1010
1011 cpos = le32_to_cpu(eb->h_list.l_recs[index].e_cpos);
1012 ret = ocfs2_find_path(ci, left_path, cpos);
1013 if (ret) {
1014 mlog_errno(ret);
1015 goto out;
1016 }
1017
1018 right_path = ocfs2_new_path_from_path(left_path);
1019 if (!right_path) {
1020 ret = -ENOMEM;
1021 mlog_errno(ret);
1022 goto out;
1023 }
1024
1025 ret = ocfs2_find_cpos_for_right_leaf(sb, left_path, &cpos);
1026 if (ret) {
1027 mlog_errno(ret);
1028 goto out;
1029 }
1030
1031 ret = ocfs2_find_path(ci, right_path, cpos);
1032 if (ret) {
1033 mlog_errno(ret);
1034 goto out;
1035 }
1036
1037 subtree_root = ocfs2_find_subtree_root(&et, left_path,
1038 right_path);
1039
1040 tmp_el = left_path->p_node[subtree_root].el;
1041 blkno = left_path->p_node[subtree_root+1].bh->b_blocknr;
1042 for (i = 0; i < le16_to_cpu(tmp_el->l_next_free_rec); i++) {
1043 if (le64_to_cpu(tmp_el->l_recs[i].e_blkno) == blkno) {
1044 *cpos_end = le32_to_cpu(tmp_el->l_recs[i+1].e_cpos);
1045 break;
1046 }
1047 }
1048
1049 BUG_ON(i == le16_to_cpu(tmp_el->l_next_free_rec));
1050
1051out:
1052 ocfs2_free_path(left_path);
1053 ocfs2_free_path(right_path);
1054 return ret;
1055}
1056
1057/*
1058 * Given a cpos and len, try to find the refcount record which contains cpos.
1059 * 1. If cpos can be found in one refcount record, return the record.
1060 * 2. If cpos can't be found, return a fake record which start from cpos
1061 * and end at a small value between cpos+len and start of the next record.
1062 * This fake record has r_refcount = 0.
1063 */
1064static int ocfs2_get_refcount_rec(struct ocfs2_caching_info *ci,
1065 struct buffer_head *ref_root_bh,
1066 u64 cpos, unsigned int len,
1067 struct ocfs2_refcount_rec *ret_rec,
1068 int *index,
1069 struct buffer_head **ret_bh)
1070{
1071 int ret = 0, i, found;
1072 u32 low_cpos, uninitialized_var(cpos_end);
1073 struct ocfs2_extent_list *el;
1074 struct ocfs2_extent_rec *rec = NULL;
1075 struct ocfs2_extent_block *eb = NULL;
1076 struct buffer_head *eb_bh = NULL, *ref_leaf_bh = NULL;
1077 struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
1078 struct ocfs2_refcount_block *rb =
1079 (struct ocfs2_refcount_block *)ref_root_bh->b_data;
1080
1081 if (!(le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL)) {
1082 ocfs2_find_refcount_rec_in_rl(ci, ref_root_bh, cpos, len,
1083 ret_rec, index);
1084 *ret_bh = ref_root_bh;
1085 get_bh(ref_root_bh);
1086 return 0;
1087 }
1088
1089 el = &rb->rf_list;
1090 low_cpos = cpos & OCFS2_32BIT_POS_MASK;
1091
1092 if (el->l_tree_depth) {
1093 ret = ocfs2_find_leaf(ci, el, low_cpos, &eb_bh);
1094 if (ret) {
1095 mlog_errno(ret);
1096 goto out;
1097 }
1098
1099 eb = (struct ocfs2_extent_block *) eb_bh->b_data;
1100 el = &eb->h_list;
1101
1102 if (el->l_tree_depth) {
1103 ret = ocfs2_error(sb,
1104 "refcount tree %llu has non zero tree depth in leaf btree tree block %llu\n",
1105 (unsigned long long)ocfs2_metadata_cache_owner(ci),
1106 (unsigned long long)eb_bh->b_blocknr);
1107 goto out;
1108 }
1109 }
1110
1111 found = 0;
1112 for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
1113 rec = &el->l_recs[i];
1114
1115 if (le32_to_cpu(rec->e_cpos) <= low_cpos) {
1116 found = 1;
1117 break;
1118 }
1119 }
1120
1121 if (found) {
1122 ret = ocfs2_get_refcount_cpos_end(ci, ref_root_bh,
1123 eb, el, i, &cpos_end);
1124 if (ret) {
1125 mlog_errno(ret);
1126 goto out;
1127 }
1128
1129 if (cpos_end < low_cpos + len)
1130 len = cpos_end - low_cpos;
1131 }
1132
1133 ret = ocfs2_read_refcount_block(ci, le64_to_cpu(rec->e_blkno),
1134 &ref_leaf_bh);
1135 if (ret) {
1136 mlog_errno(ret);
1137 goto out;
1138 }
1139
1140 ocfs2_find_refcount_rec_in_rl(ci, ref_leaf_bh, cpos, len,
1141 ret_rec, index);
1142 *ret_bh = ref_leaf_bh;
1143out:
1144 brelse(eb_bh);
1145 return ret;
1146}
1147
1148enum ocfs2_ref_rec_contig {
1149 REF_CONTIG_NONE = 0,
1150 REF_CONTIG_LEFT,
1151 REF_CONTIG_RIGHT,
1152 REF_CONTIG_LEFTRIGHT,
1153};
1154
1155static enum ocfs2_ref_rec_contig
1156 ocfs2_refcount_rec_adjacent(struct ocfs2_refcount_block *rb,
1157 int index)
1158{
1159 if ((rb->rf_records.rl_recs[index].r_refcount ==
1160 rb->rf_records.rl_recs[index + 1].r_refcount) &&
1161 (le64_to_cpu(rb->rf_records.rl_recs[index].r_cpos) +
1162 le32_to_cpu(rb->rf_records.rl_recs[index].r_clusters) ==
1163 le64_to_cpu(rb->rf_records.rl_recs[index + 1].r_cpos)))
1164 return REF_CONTIG_RIGHT;
1165
1166 return REF_CONTIG_NONE;
1167}
1168
1169static enum ocfs2_ref_rec_contig
1170 ocfs2_refcount_rec_contig(struct ocfs2_refcount_block *rb,
1171 int index)
1172{
1173 enum ocfs2_ref_rec_contig ret = REF_CONTIG_NONE;
1174
1175 if (index < le16_to_cpu(rb->rf_records.rl_used) - 1)
1176 ret = ocfs2_refcount_rec_adjacent(rb, index);
1177
1178 if (index > 0) {
1179 enum ocfs2_ref_rec_contig tmp;
1180
1181 tmp = ocfs2_refcount_rec_adjacent(rb, index - 1);
1182
1183 if (tmp == REF_CONTIG_RIGHT) {
1184 if (ret == REF_CONTIG_RIGHT)
1185 ret = REF_CONTIG_LEFTRIGHT;
1186 else
1187 ret = REF_CONTIG_LEFT;
1188 }
1189 }
1190
1191 return ret;
1192}
1193
1194static void ocfs2_rotate_refcount_rec_left(struct ocfs2_refcount_block *rb,
1195 int index)
1196{
1197 BUG_ON(rb->rf_records.rl_recs[index].r_refcount !=
1198 rb->rf_records.rl_recs[index+1].r_refcount);
1199
1200 le32_add_cpu(&rb->rf_records.rl_recs[index].r_clusters,
1201 le32_to_cpu(rb->rf_records.rl_recs[index+1].r_clusters));
1202
1203 if (index < le16_to_cpu(rb->rf_records.rl_used) - 2)
1204 memmove(&rb->rf_records.rl_recs[index + 1],
1205 &rb->rf_records.rl_recs[index + 2],
1206 sizeof(struct ocfs2_refcount_rec) *
1207 (le16_to_cpu(rb->rf_records.rl_used) - index - 2));
1208
1209 memset(&rb->rf_records.rl_recs[le16_to_cpu(rb->rf_records.rl_used) - 1],
1210 0, sizeof(struct ocfs2_refcount_rec));
1211 le16_add_cpu(&rb->rf_records.rl_used, -1);
1212}
1213
1214/*
1215 * Merge the refcount rec if we are contiguous with the adjacent recs.
1216 */
1217static void ocfs2_refcount_rec_merge(struct ocfs2_refcount_block *rb,
1218 int index)
1219{
1220 enum ocfs2_ref_rec_contig contig =
1221 ocfs2_refcount_rec_contig(rb, index);
1222
1223 if (contig == REF_CONTIG_NONE)
1224 return;
1225
1226 if (contig == REF_CONTIG_LEFT || contig == REF_CONTIG_LEFTRIGHT) {
1227 BUG_ON(index == 0);
1228 index--;
1229 }
1230
1231 ocfs2_rotate_refcount_rec_left(rb, index);
1232
1233 if (contig == REF_CONTIG_LEFTRIGHT)
1234 ocfs2_rotate_refcount_rec_left(rb, index);
1235}
1236
1237/*
1238 * Change the refcount indexed by "index" in ref_bh.
1239 * If refcount reaches 0, remove it.
1240 */
1241static int ocfs2_change_refcount_rec(handle_t *handle,
1242 struct ocfs2_caching_info *ci,
1243 struct buffer_head *ref_leaf_bh,
1244 int index, int merge, int change)
1245{
1246 int ret;
1247 struct ocfs2_refcount_block *rb =
1248 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
1249 struct ocfs2_refcount_list *rl = &rb->rf_records;
1250 struct ocfs2_refcount_rec *rec = &rl->rl_recs[index];
1251
1252 ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh,
1253 OCFS2_JOURNAL_ACCESS_WRITE);
1254 if (ret) {
1255 mlog_errno(ret);
1256 goto out;
1257 }
1258
1259 trace_ocfs2_change_refcount_rec(
1260 (unsigned long long)ocfs2_metadata_cache_owner(ci),
1261 index, le32_to_cpu(rec->r_refcount), change);
1262 le32_add_cpu(&rec->r_refcount, change);
1263
1264 if (!rec->r_refcount) {
1265 if (index != le16_to_cpu(rl->rl_used) - 1) {
1266 memmove(rec, rec + 1,
1267 (le16_to_cpu(rl->rl_used) - index - 1) *
1268 sizeof(struct ocfs2_refcount_rec));
1269 memset(&rl->rl_recs[le16_to_cpu(rl->rl_used) - 1],
1270 0, sizeof(struct ocfs2_refcount_rec));
1271 }
1272
1273 le16_add_cpu(&rl->rl_used, -1);
1274 } else if (merge)
1275 ocfs2_refcount_rec_merge(rb, index);
1276
1277 ocfs2_journal_dirty(handle, ref_leaf_bh);
1278out:
1279 return ret;
1280}
1281
1282static int ocfs2_expand_inline_ref_root(handle_t *handle,
1283 struct ocfs2_caching_info *ci,
1284 struct buffer_head *ref_root_bh,
1285 struct buffer_head **ref_leaf_bh,
1286 struct ocfs2_alloc_context *meta_ac)
1287{
1288 int ret;
1289 u16 suballoc_bit_start;
1290 u32 num_got;
1291 u64 suballoc_loc, blkno;
1292 struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
1293 struct buffer_head *new_bh = NULL;
1294 struct ocfs2_refcount_block *new_rb;
1295 struct ocfs2_refcount_block *root_rb =
1296 (struct ocfs2_refcount_block *)ref_root_bh->b_data;
1297
1298 ret = ocfs2_journal_access_rb(handle, ci, ref_root_bh,
1299 OCFS2_JOURNAL_ACCESS_WRITE);
1300 if (ret) {
1301 mlog_errno(ret);
1302 goto out;
1303 }
1304
1305 ret = ocfs2_claim_metadata(handle, meta_ac, 1, &suballoc_loc,
1306 &suballoc_bit_start, &num_got,
1307 &blkno);
1308 if (ret) {
1309 mlog_errno(ret);
1310 goto out;
1311 }
1312
1313 new_bh = sb_getblk(sb, blkno);
1314 if (new_bh == NULL) {
1315 ret = -ENOMEM;
1316 mlog_errno(ret);
1317 goto out;
1318 }
1319 ocfs2_set_new_buffer_uptodate(ci, new_bh);
1320
1321 ret = ocfs2_journal_access_rb(handle, ci, new_bh,
1322 OCFS2_JOURNAL_ACCESS_CREATE);
1323 if (ret) {
1324 mlog_errno(ret);
1325 goto out;
1326 }
1327
1328 /*
1329 * Initialize ocfs2_refcount_block.
1330 * It should contain the same information as the old root.
1331 * so just memcpy it and change the corresponding field.
1332 */
1333 memcpy(new_bh->b_data, ref_root_bh->b_data, sb->s_blocksize);
1334
1335 new_rb = (struct ocfs2_refcount_block *)new_bh->b_data;
1336 new_rb->rf_suballoc_slot = cpu_to_le16(meta_ac->ac_alloc_slot);
1337 new_rb->rf_suballoc_loc = cpu_to_le64(suballoc_loc);
1338 new_rb->rf_suballoc_bit = cpu_to_le16(suballoc_bit_start);
1339 new_rb->rf_blkno = cpu_to_le64(blkno);
1340 new_rb->rf_cpos = cpu_to_le32(0);
1341 new_rb->rf_parent = cpu_to_le64(ref_root_bh->b_blocknr);
1342 new_rb->rf_flags = cpu_to_le32(OCFS2_REFCOUNT_LEAF_FL);
1343 ocfs2_journal_dirty(handle, new_bh);
1344
1345 /* Now change the root. */
1346 memset(&root_rb->rf_list, 0, sb->s_blocksize -
1347 offsetof(struct ocfs2_refcount_block, rf_list));
1348 root_rb->rf_list.l_count = cpu_to_le16(ocfs2_extent_recs_per_rb(sb));
1349 root_rb->rf_clusters = cpu_to_le32(1);
1350 root_rb->rf_list.l_next_free_rec = cpu_to_le16(1);
1351 root_rb->rf_list.l_recs[0].e_blkno = cpu_to_le64(blkno);
1352 root_rb->rf_list.l_recs[0].e_leaf_clusters = cpu_to_le16(1);
1353 root_rb->rf_flags = cpu_to_le32(OCFS2_REFCOUNT_TREE_FL);
1354
1355 ocfs2_journal_dirty(handle, ref_root_bh);
1356
1357 trace_ocfs2_expand_inline_ref_root((unsigned long long)blkno,
1358 le16_to_cpu(new_rb->rf_records.rl_used));
1359
1360 *ref_leaf_bh = new_bh;
1361 new_bh = NULL;
1362out:
1363 brelse(new_bh);
1364 return ret;
1365}
1366
1367static int ocfs2_refcount_rec_no_intersect(struct ocfs2_refcount_rec *prev,
1368 struct ocfs2_refcount_rec *next)
1369{
1370 if (ocfs2_get_ref_rec_low_cpos(prev) + le32_to_cpu(prev->r_clusters) <=
1371 ocfs2_get_ref_rec_low_cpos(next))
1372 return 1;
1373
1374 return 0;
1375}
1376
1377static int cmp_refcount_rec_by_low_cpos(const void *a, const void *b)
1378{
1379 const struct ocfs2_refcount_rec *l = a, *r = b;
1380 u32 l_cpos = ocfs2_get_ref_rec_low_cpos(l);
1381 u32 r_cpos = ocfs2_get_ref_rec_low_cpos(r);
1382
1383 if (l_cpos > r_cpos)
1384 return 1;
1385 if (l_cpos < r_cpos)
1386 return -1;
1387 return 0;
1388}
1389
1390static int cmp_refcount_rec_by_cpos(const void *a, const void *b)
1391{
1392 const struct ocfs2_refcount_rec *l = a, *r = b;
1393 u64 l_cpos = le64_to_cpu(l->r_cpos);
1394 u64 r_cpos = le64_to_cpu(r->r_cpos);
1395
1396 if (l_cpos > r_cpos)
1397 return 1;
1398 if (l_cpos < r_cpos)
1399 return -1;
1400 return 0;
1401}
1402
1403static void swap_refcount_rec(void *a, void *b, int size)
1404{
1405 struct ocfs2_refcount_rec *l = a, *r = b;
1406
1407 swap(*l, *r);
1408}
1409
1410/*
1411 * The refcount cpos are ordered by their 64bit cpos,
1412 * But we will use the low 32 bit to be the e_cpos in the b-tree.
1413 * So we need to make sure that this pos isn't intersected with others.
1414 *
1415 * Note: The refcount block is already sorted by their low 32 bit cpos,
1416 * So just try the middle pos first, and we will exit when we find
1417 * the good position.
1418 */
1419static int ocfs2_find_refcount_split_pos(struct ocfs2_refcount_list *rl,
1420 u32 *split_pos, int *split_index)
1421{
1422 int num_used = le16_to_cpu(rl->rl_used);
1423 int delta, middle = num_used / 2;
1424
1425 for (delta = 0; delta < middle; delta++) {
1426 /* Let's check delta earlier than middle */
1427 if (ocfs2_refcount_rec_no_intersect(
1428 &rl->rl_recs[middle - delta - 1],
1429 &rl->rl_recs[middle - delta])) {
1430 *split_index = middle - delta;
1431 break;
1432 }
1433
1434 /* For even counts, don't walk off the end */
1435 if ((middle + delta + 1) == num_used)
1436 continue;
1437
1438 /* Now try delta past middle */
1439 if (ocfs2_refcount_rec_no_intersect(
1440 &rl->rl_recs[middle + delta],
1441 &rl->rl_recs[middle + delta + 1])) {
1442 *split_index = middle + delta + 1;
1443 break;
1444 }
1445 }
1446
1447 if (delta >= middle)
1448 return -ENOSPC;
1449
1450 *split_pos = ocfs2_get_ref_rec_low_cpos(&rl->rl_recs[*split_index]);
1451 return 0;
1452}
1453
1454static int ocfs2_divide_leaf_refcount_block(struct buffer_head *ref_leaf_bh,
1455 struct buffer_head *new_bh,
1456 u32 *split_cpos)
1457{
1458 int split_index = 0, num_moved, ret;
1459 u32 cpos = 0;
1460 struct ocfs2_refcount_block *rb =
1461 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
1462 struct ocfs2_refcount_list *rl = &rb->rf_records;
1463 struct ocfs2_refcount_block *new_rb =
1464 (struct ocfs2_refcount_block *)new_bh->b_data;
1465 struct ocfs2_refcount_list *new_rl = &new_rb->rf_records;
1466
1467 trace_ocfs2_divide_leaf_refcount_block(
1468 (unsigned long long)ref_leaf_bh->b_blocknr,
1469 le16_to_cpu(rl->rl_count), le16_to_cpu(rl->rl_used));
1470
1471 /*
1472 * XXX: Improvement later.
1473 * If we know all the high 32 bit cpos is the same, no need to sort.
1474 *
1475 * In order to make the whole process safe, we do:
1476 * 1. sort the entries by their low 32 bit cpos first so that we can
1477 * find the split cpos easily.
1478 * 2. call ocfs2_insert_extent to insert the new refcount block.
1479 * 3. move the refcount rec to the new block.
1480 * 4. sort the entries by their 64 bit cpos.
1481 * 5. dirty the new_rb and rb.
1482 */
1483 sort(&rl->rl_recs, le16_to_cpu(rl->rl_used),
1484 sizeof(struct ocfs2_refcount_rec),
1485 cmp_refcount_rec_by_low_cpos, swap_refcount_rec);
1486
1487 ret = ocfs2_find_refcount_split_pos(rl, &cpos, &split_index);
1488 if (ret) {
1489 mlog_errno(ret);
1490 return ret;
1491 }
1492
1493 new_rb->rf_cpos = cpu_to_le32(cpos);
1494
1495 /* move refcount records starting from split_index to the new block. */
1496 num_moved = le16_to_cpu(rl->rl_used) - split_index;
1497 memcpy(new_rl->rl_recs, &rl->rl_recs[split_index],
1498 num_moved * sizeof(struct ocfs2_refcount_rec));
1499
1500 /*ok, remove the entries we just moved over to the other block. */
1501 memset(&rl->rl_recs[split_index], 0,
1502 num_moved * sizeof(struct ocfs2_refcount_rec));
1503
1504 /* change old and new rl_used accordingly. */
1505 le16_add_cpu(&rl->rl_used, -num_moved);
1506 new_rl->rl_used = cpu_to_le16(num_moved);
1507
1508 sort(&rl->rl_recs, le16_to_cpu(rl->rl_used),
1509 sizeof(struct ocfs2_refcount_rec),
1510 cmp_refcount_rec_by_cpos, swap_refcount_rec);
1511
1512 sort(&new_rl->rl_recs, le16_to_cpu(new_rl->rl_used),
1513 sizeof(struct ocfs2_refcount_rec),
1514 cmp_refcount_rec_by_cpos, swap_refcount_rec);
1515
1516 *split_cpos = cpos;
1517 return 0;
1518}
1519
1520static int ocfs2_new_leaf_refcount_block(handle_t *handle,
1521 struct ocfs2_caching_info *ci,
1522 struct buffer_head *ref_root_bh,
1523 struct buffer_head *ref_leaf_bh,
1524 struct ocfs2_alloc_context *meta_ac)
1525{
1526 int ret;
1527 u16 suballoc_bit_start;
1528 u32 num_got, new_cpos;
1529 u64 suballoc_loc, blkno;
1530 struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
1531 struct ocfs2_refcount_block *root_rb =
1532 (struct ocfs2_refcount_block *)ref_root_bh->b_data;
1533 struct buffer_head *new_bh = NULL;
1534 struct ocfs2_refcount_block *new_rb;
1535 struct ocfs2_extent_tree ref_et;
1536
1537 BUG_ON(!(le32_to_cpu(root_rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL));
1538
1539 ret = ocfs2_journal_access_rb(handle, ci, ref_root_bh,
1540 OCFS2_JOURNAL_ACCESS_WRITE);
1541 if (ret) {
1542 mlog_errno(ret);
1543 goto out;
1544 }
1545
1546 ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh,
1547 OCFS2_JOURNAL_ACCESS_WRITE);
1548 if (ret) {
1549 mlog_errno(ret);
1550 goto out;
1551 }
1552
1553 ret = ocfs2_claim_metadata(handle, meta_ac, 1, &suballoc_loc,
1554 &suballoc_bit_start, &num_got,
1555 &blkno);
1556 if (ret) {
1557 mlog_errno(ret);
1558 goto out;
1559 }
1560
1561 new_bh = sb_getblk(sb, blkno);
1562 if (new_bh == NULL) {
1563 ret = -ENOMEM;
1564 mlog_errno(ret);
1565 goto out;
1566 }
1567 ocfs2_set_new_buffer_uptodate(ci, new_bh);
1568
1569 ret = ocfs2_journal_access_rb(handle, ci, new_bh,
1570 OCFS2_JOURNAL_ACCESS_CREATE);
1571 if (ret) {
1572 mlog_errno(ret);
1573 goto out;
1574 }
1575
1576 /* Initialize ocfs2_refcount_block. */
1577 new_rb = (struct ocfs2_refcount_block *)new_bh->b_data;
1578 memset(new_rb, 0, sb->s_blocksize);
1579 strcpy((void *)new_rb, OCFS2_REFCOUNT_BLOCK_SIGNATURE);
1580 new_rb->rf_suballoc_slot = cpu_to_le16(meta_ac->ac_alloc_slot);
1581 new_rb->rf_suballoc_loc = cpu_to_le64(suballoc_loc);
1582 new_rb->rf_suballoc_bit = cpu_to_le16(suballoc_bit_start);
1583 new_rb->rf_fs_generation = cpu_to_le32(OCFS2_SB(sb)->fs_generation);
1584 new_rb->rf_blkno = cpu_to_le64(blkno);
1585 new_rb->rf_parent = cpu_to_le64(ref_root_bh->b_blocknr);
1586 new_rb->rf_flags = cpu_to_le32(OCFS2_REFCOUNT_LEAF_FL);
1587 new_rb->rf_records.rl_count =
1588 cpu_to_le16(ocfs2_refcount_recs_per_rb(sb));
1589 new_rb->rf_generation = root_rb->rf_generation;
1590
1591 ret = ocfs2_divide_leaf_refcount_block(ref_leaf_bh, new_bh, &new_cpos);
1592 if (ret) {
1593 mlog_errno(ret);
1594 goto out;
1595 }
1596
1597 ocfs2_journal_dirty(handle, ref_leaf_bh);
1598 ocfs2_journal_dirty(handle, new_bh);
1599
1600 ocfs2_init_refcount_extent_tree(&ref_et, ci, ref_root_bh);
1601
1602 trace_ocfs2_new_leaf_refcount_block(
1603 (unsigned long long)new_bh->b_blocknr, new_cpos);
1604
1605 /* Insert the new leaf block with the specific offset cpos. */
1606 ret = ocfs2_insert_extent(handle, &ref_et, new_cpos, new_bh->b_blocknr,
1607 1, 0, meta_ac);
1608 if (ret)
1609 mlog_errno(ret);
1610
1611out:
1612 brelse(new_bh);
1613 return ret;
1614}
1615
1616static int ocfs2_expand_refcount_tree(handle_t *handle,
1617 struct ocfs2_caching_info *ci,
1618 struct buffer_head *ref_root_bh,
1619 struct buffer_head *ref_leaf_bh,
1620 struct ocfs2_alloc_context *meta_ac)
1621{
1622 int ret;
1623 struct buffer_head *expand_bh = NULL;
1624
1625 if (ref_root_bh == ref_leaf_bh) {
1626 /*
1627 * the old root bh hasn't been expanded to a b-tree,
1628 * so expand it first.
1629 */
1630 ret = ocfs2_expand_inline_ref_root(handle, ci, ref_root_bh,
1631 &expand_bh, meta_ac);
1632 if (ret) {
1633 mlog_errno(ret);
1634 goto out;
1635 }
1636 } else {
1637 expand_bh = ref_leaf_bh;
1638 get_bh(expand_bh);
1639 }
1640
1641
1642 /* Now add a new refcount block into the tree.*/
1643 ret = ocfs2_new_leaf_refcount_block(handle, ci, ref_root_bh,
1644 expand_bh, meta_ac);
1645 if (ret)
1646 mlog_errno(ret);
1647out:
1648 brelse(expand_bh);
1649 return ret;
1650}
1651
1652/*
1653 * Adjust the extent rec in b-tree representing ref_leaf_bh.
1654 *
1655 * Only called when we have inserted a new refcount rec at index 0
1656 * which means ocfs2_extent_rec.e_cpos may need some change.
1657 */
1658static int ocfs2_adjust_refcount_rec(handle_t *handle,
1659 struct ocfs2_caching_info *ci,
1660 struct buffer_head *ref_root_bh,
1661 struct buffer_head *ref_leaf_bh,
1662 struct ocfs2_refcount_rec *rec)
1663{
1664 int ret = 0, i;
1665 u32 new_cpos, old_cpos;
1666 struct ocfs2_path *path = NULL;
1667 struct ocfs2_extent_tree et;
1668 struct ocfs2_refcount_block *rb =
1669 (struct ocfs2_refcount_block *)ref_root_bh->b_data;
1670 struct ocfs2_extent_list *el;
1671
1672 if (!(le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL))
1673 goto out;
1674
1675 rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
1676 old_cpos = le32_to_cpu(rb->rf_cpos);
1677 new_cpos = le64_to_cpu(rec->r_cpos) & OCFS2_32BIT_POS_MASK;
1678 if (old_cpos <= new_cpos)
1679 goto out;
1680
1681 ocfs2_init_refcount_extent_tree(&et, ci, ref_root_bh);
1682
1683 path = ocfs2_new_path_from_et(&et);
1684 if (!path) {
1685 ret = -ENOMEM;
1686 mlog_errno(ret);
1687 goto out;
1688 }
1689
1690 ret = ocfs2_find_path(ci, path, old_cpos);
1691 if (ret) {
1692 mlog_errno(ret);
1693 goto out;
1694 }
1695
1696 /*
1697 * 2 more credits, one for the leaf refcount block, one for
1698 * the extent block contains the extent rec.
1699 */
1700 ret = ocfs2_extend_trans(handle, 2);
1701 if (ret < 0) {
1702 mlog_errno(ret);
1703 goto out;
1704 }
1705
1706 ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh,
1707 OCFS2_JOURNAL_ACCESS_WRITE);
1708 if (ret < 0) {
1709 mlog_errno(ret);
1710 goto out;
1711 }
1712
1713 ret = ocfs2_journal_access_eb(handle, ci, path_leaf_bh(path),
1714 OCFS2_JOURNAL_ACCESS_WRITE);
1715 if (ret < 0) {
1716 mlog_errno(ret);
1717 goto out;
1718 }
1719
1720 /* change the leaf extent block first. */
1721 el = path_leaf_el(path);
1722
1723 for (i = 0; i < le16_to_cpu(el->l_next_free_rec); i++)
1724 if (le32_to_cpu(el->l_recs[i].e_cpos) == old_cpos)
1725 break;
1726
1727 BUG_ON(i == le16_to_cpu(el->l_next_free_rec));
1728
1729 el->l_recs[i].e_cpos = cpu_to_le32(new_cpos);
1730
1731 /* change the r_cpos in the leaf block. */
1732 rb->rf_cpos = cpu_to_le32(new_cpos);
1733
1734 ocfs2_journal_dirty(handle, path_leaf_bh(path));
1735 ocfs2_journal_dirty(handle, ref_leaf_bh);
1736
1737out:
1738 ocfs2_free_path(path);
1739 return ret;
1740}
1741
1742static int ocfs2_insert_refcount_rec(handle_t *handle,
1743 struct ocfs2_caching_info *ci,
1744 struct buffer_head *ref_root_bh,
1745 struct buffer_head *ref_leaf_bh,
1746 struct ocfs2_refcount_rec *rec,
1747 int index, int merge,
1748 struct ocfs2_alloc_context *meta_ac)
1749{
1750 int ret;
1751 struct ocfs2_refcount_block *rb =
1752 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
1753 struct ocfs2_refcount_list *rf_list = &rb->rf_records;
1754 struct buffer_head *new_bh = NULL;
1755
1756 BUG_ON(le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL);
1757
1758 if (rf_list->rl_used == rf_list->rl_count) {
1759 u64 cpos = le64_to_cpu(rec->r_cpos);
1760 u32 len = le32_to_cpu(rec->r_clusters);
1761
1762 ret = ocfs2_expand_refcount_tree(handle, ci, ref_root_bh,
1763 ref_leaf_bh, meta_ac);
1764 if (ret) {
1765 mlog_errno(ret);
1766 goto out;
1767 }
1768
1769 ret = ocfs2_get_refcount_rec(ci, ref_root_bh,
1770 cpos, len, NULL, &index,
1771 &new_bh);
1772 if (ret) {
1773 mlog_errno(ret);
1774 goto out;
1775 }
1776
1777 ref_leaf_bh = new_bh;
1778 rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
1779 rf_list = &rb->rf_records;
1780 }
1781
1782 ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh,
1783 OCFS2_JOURNAL_ACCESS_WRITE);
1784 if (ret) {
1785 mlog_errno(ret);
1786 goto out;
1787 }
1788
1789 if (index < le16_to_cpu(rf_list->rl_used))
1790 memmove(&rf_list->rl_recs[index + 1],
1791 &rf_list->rl_recs[index],
1792 (le16_to_cpu(rf_list->rl_used) - index) *
1793 sizeof(struct ocfs2_refcount_rec));
1794
1795 trace_ocfs2_insert_refcount_rec(
1796 (unsigned long long)ref_leaf_bh->b_blocknr, index,
1797 (unsigned long long)le64_to_cpu(rec->r_cpos),
1798 le32_to_cpu(rec->r_clusters), le32_to_cpu(rec->r_refcount));
1799
1800 rf_list->rl_recs[index] = *rec;
1801
1802 le16_add_cpu(&rf_list->rl_used, 1);
1803
1804 if (merge)
1805 ocfs2_refcount_rec_merge(rb, index);
1806
1807 ocfs2_journal_dirty(handle, ref_leaf_bh);
1808
1809 if (index == 0) {
1810 ret = ocfs2_adjust_refcount_rec(handle, ci,
1811 ref_root_bh,
1812 ref_leaf_bh, rec);
1813 if (ret)
1814 mlog_errno(ret);
1815 }
1816out:
1817 brelse(new_bh);
1818 return ret;
1819}
1820
1821/*
1822 * Split the refcount_rec indexed by "index" in ref_leaf_bh.
1823 * This is much simple than our b-tree code.
1824 * split_rec is the new refcount rec we want to insert.
1825 * If split_rec->r_refcount > 0, we are changing the refcount(in case we
1826 * increase refcount or decrease a refcount to non-zero).
1827 * If split_rec->r_refcount == 0, we are punching a hole in current refcount
1828 * rec( in case we decrease a refcount to zero).
1829 */
1830static int ocfs2_split_refcount_rec(handle_t *handle,
1831 struct ocfs2_caching_info *ci,
1832 struct buffer_head *ref_root_bh,
1833 struct buffer_head *ref_leaf_bh,
1834 struct ocfs2_refcount_rec *split_rec,
1835 int index, int merge,
1836 struct ocfs2_alloc_context *meta_ac,
1837 struct ocfs2_cached_dealloc_ctxt *dealloc)
1838{
1839 int ret, recs_need;
1840 u32 len;
1841 struct ocfs2_refcount_block *rb =
1842 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
1843 struct ocfs2_refcount_list *rf_list = &rb->rf_records;
1844 struct ocfs2_refcount_rec *orig_rec = &rf_list->rl_recs[index];
1845 struct ocfs2_refcount_rec *tail_rec = NULL;
1846 struct buffer_head *new_bh = NULL;
1847
1848 BUG_ON(le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL);
1849
1850 trace_ocfs2_split_refcount_rec(le64_to_cpu(orig_rec->r_cpos),
1851 le32_to_cpu(orig_rec->r_clusters),
1852 le32_to_cpu(orig_rec->r_refcount),
1853 le64_to_cpu(split_rec->r_cpos),
1854 le32_to_cpu(split_rec->r_clusters),
1855 le32_to_cpu(split_rec->r_refcount));
1856
1857 /*
1858 * If we just need to split the header or tail clusters,
1859 * no more recs are needed, just split is OK.
1860 * Otherwise we at least need one new recs.
1861 */
1862 if (!split_rec->r_refcount &&
1863 (split_rec->r_cpos == orig_rec->r_cpos ||
1864 le64_to_cpu(split_rec->r_cpos) +
1865 le32_to_cpu(split_rec->r_clusters) ==
1866 le64_to_cpu(orig_rec->r_cpos) + le32_to_cpu(orig_rec->r_clusters)))
1867 recs_need = 0;
1868 else
1869 recs_need = 1;
1870
1871 /*
1872 * We need one more rec if we split in the middle and the new rec have
1873 * some refcount in it.
1874 */
1875 if (split_rec->r_refcount &&
1876 (split_rec->r_cpos != orig_rec->r_cpos &&
1877 le64_to_cpu(split_rec->r_cpos) +
1878 le32_to_cpu(split_rec->r_clusters) !=
1879 le64_to_cpu(orig_rec->r_cpos) + le32_to_cpu(orig_rec->r_clusters)))
1880 recs_need++;
1881
1882 /* If the leaf block don't have enough record, expand it. */
1883 if (le16_to_cpu(rf_list->rl_used) + recs_need >
1884 le16_to_cpu(rf_list->rl_count)) {
1885 struct ocfs2_refcount_rec tmp_rec;
1886 u64 cpos = le64_to_cpu(orig_rec->r_cpos);
1887 len = le32_to_cpu(orig_rec->r_clusters);
1888 ret = ocfs2_expand_refcount_tree(handle, ci, ref_root_bh,
1889 ref_leaf_bh, meta_ac);
1890 if (ret) {
1891 mlog_errno(ret);
1892 goto out;
1893 }
1894
1895 /*
1896 * We have to re-get it since now cpos may be moved to
1897 * another leaf block.
1898 */
1899 ret = ocfs2_get_refcount_rec(ci, ref_root_bh,
1900 cpos, len, &tmp_rec, &index,
1901 &new_bh);
1902 if (ret) {
1903 mlog_errno(ret);
1904 goto out;
1905 }
1906
1907 ref_leaf_bh = new_bh;
1908 rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
1909 rf_list = &rb->rf_records;
1910 orig_rec = &rf_list->rl_recs[index];
1911 }
1912
1913 ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh,
1914 OCFS2_JOURNAL_ACCESS_WRITE);
1915 if (ret) {
1916 mlog_errno(ret);
1917 goto out;
1918 }
1919
1920 /*
1921 * We have calculated out how many new records we need and store
1922 * in recs_need, so spare enough space first by moving the records
1923 * after "index" to the end.
1924 */
1925 if (index != le16_to_cpu(rf_list->rl_used) - 1)
1926 memmove(&rf_list->rl_recs[index + 1 + recs_need],
1927 &rf_list->rl_recs[index + 1],
1928 (le16_to_cpu(rf_list->rl_used) - index - 1) *
1929 sizeof(struct ocfs2_refcount_rec));
1930
1931 len = (le64_to_cpu(orig_rec->r_cpos) +
1932 le32_to_cpu(orig_rec->r_clusters)) -
1933 (le64_to_cpu(split_rec->r_cpos) +
1934 le32_to_cpu(split_rec->r_clusters));
1935
1936 /*
1937 * If we have "len", the we will split in the tail and move it
1938 * to the end of the space we have just spared.
1939 */
1940 if (len) {
1941 tail_rec = &rf_list->rl_recs[index + recs_need];
1942
1943 memcpy(tail_rec, orig_rec, sizeof(struct ocfs2_refcount_rec));
1944 le64_add_cpu(&tail_rec->r_cpos,
1945 le32_to_cpu(tail_rec->r_clusters) - len);
1946 tail_rec->r_clusters = cpu_to_le32(len);
1947 }
1948
1949 /*
1950 * If the split pos isn't the same as the original one, we need to
1951 * split in the head.
1952 *
1953 * Note: We have the chance that split_rec.r_refcount = 0,
1954 * recs_need = 0 and len > 0, which means we just cut the head from
1955 * the orig_rec and in that case we have done some modification in
1956 * orig_rec above, so the check for r_cpos is faked.
1957 */
1958 if (split_rec->r_cpos != orig_rec->r_cpos && tail_rec != orig_rec) {
1959 len = le64_to_cpu(split_rec->r_cpos) -
1960 le64_to_cpu(orig_rec->r_cpos);
1961 orig_rec->r_clusters = cpu_to_le32(len);
1962 index++;
1963 }
1964
1965 le16_add_cpu(&rf_list->rl_used, recs_need);
1966
1967 if (split_rec->r_refcount) {
1968 rf_list->rl_recs[index] = *split_rec;
1969 trace_ocfs2_split_refcount_rec_insert(
1970 (unsigned long long)ref_leaf_bh->b_blocknr, index,
1971 (unsigned long long)le64_to_cpu(split_rec->r_cpos),
1972 le32_to_cpu(split_rec->r_clusters),
1973 le32_to_cpu(split_rec->r_refcount));
1974
1975 if (merge)
1976 ocfs2_refcount_rec_merge(rb, index);
1977 }
1978
1979 ocfs2_journal_dirty(handle, ref_leaf_bh);
1980
1981out:
1982 brelse(new_bh);
1983 return ret;
1984}
1985
1986static int __ocfs2_increase_refcount(handle_t *handle,
1987 struct ocfs2_caching_info *ci,
1988 struct buffer_head *ref_root_bh,
1989 u64 cpos, u32 len, int merge,
1990 struct ocfs2_alloc_context *meta_ac,
1991 struct ocfs2_cached_dealloc_ctxt *dealloc)
1992{
1993 int ret = 0, index;
1994 struct buffer_head *ref_leaf_bh = NULL;
1995 struct ocfs2_refcount_rec rec;
1996 unsigned int set_len = 0;
1997
1998 trace_ocfs2_increase_refcount_begin(
1999 (unsigned long long)ocfs2_metadata_cache_owner(ci),
2000 (unsigned long long)cpos, len);
2001
2002 while (len) {
2003 ret = ocfs2_get_refcount_rec(ci, ref_root_bh,
2004 cpos, len, &rec, &index,
2005 &ref_leaf_bh);
2006 if (ret) {
2007 mlog_errno(ret);
2008 goto out;
2009 }
2010
2011 set_len = le32_to_cpu(rec.r_clusters);
2012
2013 /*
2014 * Here we may meet with 3 situations:
2015 *
2016 * 1. If we find an already existing record, and the length
2017 * is the same, cool, we just need to increase the r_refcount
2018 * and it is OK.
2019 * 2. If we find a hole, just insert it with r_refcount = 1.
2020 * 3. If we are in the middle of one extent record, split
2021 * it.
2022 */
2023 if (rec.r_refcount && le64_to_cpu(rec.r_cpos) == cpos &&
2024 set_len <= len) {
2025 trace_ocfs2_increase_refcount_change(
2026 (unsigned long long)cpos, set_len,
2027 le32_to_cpu(rec.r_refcount));
2028 ret = ocfs2_change_refcount_rec(handle, ci,
2029 ref_leaf_bh, index,
2030 merge, 1);
2031 if (ret) {
2032 mlog_errno(ret);
2033 goto out;
2034 }
2035 } else if (!rec.r_refcount) {
2036 rec.r_refcount = cpu_to_le32(1);
2037
2038 trace_ocfs2_increase_refcount_insert(
2039 (unsigned long long)le64_to_cpu(rec.r_cpos),
2040 set_len);
2041 ret = ocfs2_insert_refcount_rec(handle, ci, ref_root_bh,
2042 ref_leaf_bh,
2043 &rec, index,
2044 merge, meta_ac);
2045 if (ret) {
2046 mlog_errno(ret);
2047 goto out;
2048 }
2049 } else {
2050 set_len = min((u64)(cpos + len),
2051 le64_to_cpu(rec.r_cpos) + set_len) - cpos;
2052 rec.r_cpos = cpu_to_le64(cpos);
2053 rec.r_clusters = cpu_to_le32(set_len);
2054 le32_add_cpu(&rec.r_refcount, 1);
2055
2056 trace_ocfs2_increase_refcount_split(
2057 (unsigned long long)le64_to_cpu(rec.r_cpos),
2058 set_len, le32_to_cpu(rec.r_refcount));
2059 ret = ocfs2_split_refcount_rec(handle, ci,
2060 ref_root_bh, ref_leaf_bh,
2061 &rec, index, merge,
2062 meta_ac, dealloc);
2063 if (ret) {
2064 mlog_errno(ret);
2065 goto out;
2066 }
2067 }
2068
2069 cpos += set_len;
2070 len -= set_len;
2071 brelse(ref_leaf_bh);
2072 ref_leaf_bh = NULL;
2073 }
2074
2075out:
2076 brelse(ref_leaf_bh);
2077 return ret;
2078}
2079
2080static int ocfs2_remove_refcount_extent(handle_t *handle,
2081 struct ocfs2_caching_info *ci,
2082 struct buffer_head *ref_root_bh,
2083 struct buffer_head *ref_leaf_bh,
2084 struct ocfs2_alloc_context *meta_ac,
2085 struct ocfs2_cached_dealloc_ctxt *dealloc)
2086{
2087 int ret;
2088 struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
2089 struct ocfs2_refcount_block *rb =
2090 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
2091 struct ocfs2_extent_tree et;
2092
2093 BUG_ON(rb->rf_records.rl_used);
2094
2095 trace_ocfs2_remove_refcount_extent(
2096 (unsigned long long)ocfs2_metadata_cache_owner(ci),
2097 (unsigned long long)ref_leaf_bh->b_blocknr,
2098 le32_to_cpu(rb->rf_cpos));
2099
2100 ocfs2_init_refcount_extent_tree(&et, ci, ref_root_bh);
2101 ret = ocfs2_remove_extent(handle, &et, le32_to_cpu(rb->rf_cpos),
2102 1, meta_ac, dealloc);
2103 if (ret) {
2104 mlog_errno(ret);
2105 goto out;
2106 }
2107
2108 ocfs2_remove_from_cache(ci, ref_leaf_bh);
2109
2110 /*
2111 * add the freed block to the dealloc so that it will be freed
2112 * when we run dealloc.
2113 */
2114 ret = ocfs2_cache_block_dealloc(dealloc, EXTENT_ALLOC_SYSTEM_INODE,
2115 le16_to_cpu(rb->rf_suballoc_slot),
2116 le64_to_cpu(rb->rf_suballoc_loc),
2117 le64_to_cpu(rb->rf_blkno),
2118 le16_to_cpu(rb->rf_suballoc_bit));
2119 if (ret) {
2120 mlog_errno(ret);
2121 goto out;
2122 }
2123
2124 ret = ocfs2_journal_access_rb(handle, ci, ref_root_bh,
2125 OCFS2_JOURNAL_ACCESS_WRITE);
2126 if (ret) {
2127 mlog_errno(ret);
2128 goto out;
2129 }
2130
2131 rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
2132
2133 le32_add_cpu(&rb->rf_clusters, -1);
2134
2135 /*
2136 * check whether we need to restore the root refcount block if
2137 * there is no leaf extent block at atll.
2138 */
2139 if (!rb->rf_list.l_next_free_rec) {
2140 BUG_ON(rb->rf_clusters);
2141
2142 trace_ocfs2_restore_refcount_block(
2143 (unsigned long long)ref_root_bh->b_blocknr);
2144
2145 rb->rf_flags = 0;
2146 rb->rf_parent = 0;
2147 rb->rf_cpos = 0;
2148 memset(&rb->rf_records, 0, sb->s_blocksize -
2149 offsetof(struct ocfs2_refcount_block, rf_records));
2150 rb->rf_records.rl_count =
2151 cpu_to_le16(ocfs2_refcount_recs_per_rb(sb));
2152 }
2153
2154 ocfs2_journal_dirty(handle, ref_root_bh);
2155
2156out:
2157 return ret;
2158}
2159
2160int ocfs2_increase_refcount(handle_t *handle,
2161 struct ocfs2_caching_info *ci,
2162 struct buffer_head *ref_root_bh,
2163 u64 cpos, u32 len,
2164 struct ocfs2_alloc_context *meta_ac,
2165 struct ocfs2_cached_dealloc_ctxt *dealloc)
2166{
2167 return __ocfs2_increase_refcount(handle, ci, ref_root_bh,
2168 cpos, len, 1,
2169 meta_ac, dealloc);
2170}
2171
2172static int ocfs2_decrease_refcount_rec(handle_t *handle,
2173 struct ocfs2_caching_info *ci,
2174 struct buffer_head *ref_root_bh,
2175 struct buffer_head *ref_leaf_bh,
2176 int index, u64 cpos, unsigned int len,
2177 struct ocfs2_alloc_context *meta_ac,
2178 struct ocfs2_cached_dealloc_ctxt *dealloc)
2179{
2180 int ret;
2181 struct ocfs2_refcount_block *rb =
2182 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
2183 struct ocfs2_refcount_rec *rec = &rb->rf_records.rl_recs[index];
2184
2185 BUG_ON(cpos < le64_to_cpu(rec->r_cpos));
2186 BUG_ON(cpos + len >
2187 le64_to_cpu(rec->r_cpos) + le32_to_cpu(rec->r_clusters));
2188
2189 trace_ocfs2_decrease_refcount_rec(
2190 (unsigned long long)ocfs2_metadata_cache_owner(ci),
2191 (unsigned long long)cpos, len);
2192
2193 if (cpos == le64_to_cpu(rec->r_cpos) &&
2194 len == le32_to_cpu(rec->r_clusters))
2195 ret = ocfs2_change_refcount_rec(handle, ci,
2196 ref_leaf_bh, index, 1, -1);
2197 else {
2198 struct ocfs2_refcount_rec split = *rec;
2199 split.r_cpos = cpu_to_le64(cpos);
2200 split.r_clusters = cpu_to_le32(len);
2201
2202 le32_add_cpu(&split.r_refcount, -1);
2203
2204 ret = ocfs2_split_refcount_rec(handle, ci,
2205 ref_root_bh, ref_leaf_bh,
2206 &split, index, 1,
2207 meta_ac, dealloc);
2208 }
2209
2210 if (ret) {
2211 mlog_errno(ret);
2212 goto out;
2213 }
2214
2215 /* Remove the leaf refcount block if it contains no refcount record. */
2216 if (!rb->rf_records.rl_used && ref_leaf_bh != ref_root_bh) {
2217 ret = ocfs2_remove_refcount_extent(handle, ci, ref_root_bh,
2218 ref_leaf_bh, meta_ac,
2219 dealloc);
2220 if (ret)
2221 mlog_errno(ret);
2222 }
2223
2224out:
2225 return ret;
2226}
2227
2228static int __ocfs2_decrease_refcount(handle_t *handle,
2229 struct ocfs2_caching_info *ci,
2230 struct buffer_head *ref_root_bh,
2231 u64 cpos, u32 len,
2232 struct ocfs2_alloc_context *meta_ac,
2233 struct ocfs2_cached_dealloc_ctxt *dealloc,
2234 int delete)
2235{
2236 int ret = 0, index = 0;
2237 struct ocfs2_refcount_rec rec;
2238 unsigned int r_count = 0, r_len;
2239 struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
2240 struct buffer_head *ref_leaf_bh = NULL;
2241
2242 trace_ocfs2_decrease_refcount(
2243 (unsigned long long)ocfs2_metadata_cache_owner(ci),
2244 (unsigned long long)cpos, len, delete);
2245
2246 while (len) {
2247 ret = ocfs2_get_refcount_rec(ci, ref_root_bh,
2248 cpos, len, &rec, &index,
2249 &ref_leaf_bh);
2250 if (ret) {
2251 mlog_errno(ret);
2252 goto out;
2253 }
2254
2255 r_count = le32_to_cpu(rec.r_refcount);
2256 BUG_ON(r_count == 0);
2257 if (!delete)
2258 BUG_ON(r_count > 1);
2259
2260 r_len = min((u64)(cpos + len), le64_to_cpu(rec.r_cpos) +
2261 le32_to_cpu(rec.r_clusters)) - cpos;
2262
2263 ret = ocfs2_decrease_refcount_rec(handle, ci, ref_root_bh,
2264 ref_leaf_bh, index,
2265 cpos, r_len,
2266 meta_ac, dealloc);
2267 if (ret) {
2268 mlog_errno(ret);
2269 goto out;
2270 }
2271
2272 if (le32_to_cpu(rec.r_refcount) == 1 && delete) {
2273 ret = ocfs2_cache_cluster_dealloc(dealloc,
2274 ocfs2_clusters_to_blocks(sb, cpos),
2275 r_len);
2276 if (ret) {
2277 mlog_errno(ret);
2278 goto out;
2279 }
2280 }
2281
2282 cpos += r_len;
2283 len -= r_len;
2284 brelse(ref_leaf_bh);
2285 ref_leaf_bh = NULL;
2286 }
2287
2288out:
2289 brelse(ref_leaf_bh);
2290 return ret;
2291}
2292
2293/* Caller must hold refcount tree lock. */
2294int ocfs2_decrease_refcount(struct inode *inode,
2295 handle_t *handle, u32 cpos, u32 len,
2296 struct ocfs2_alloc_context *meta_ac,
2297 struct ocfs2_cached_dealloc_ctxt *dealloc,
2298 int delete)
2299{
2300 int ret;
2301 u64 ref_blkno;
2302 struct buffer_head *ref_root_bh = NULL;
2303 struct ocfs2_refcount_tree *tree;
2304
2305 BUG_ON(!ocfs2_is_refcount_inode(inode));
2306
2307 ret = ocfs2_get_refcount_block(inode, &ref_blkno);
2308 if (ret) {
2309 mlog_errno(ret);
2310 goto out;
2311 }
2312
2313 ret = ocfs2_get_refcount_tree(OCFS2_SB(inode->i_sb), ref_blkno, &tree);
2314 if (ret) {
2315 mlog_errno(ret);
2316 goto out;
2317 }
2318
2319 ret = ocfs2_read_refcount_block(&tree->rf_ci, tree->rf_blkno,
2320 &ref_root_bh);
2321 if (ret) {
2322 mlog_errno(ret);
2323 goto out;
2324 }
2325
2326 ret = __ocfs2_decrease_refcount(handle, &tree->rf_ci, ref_root_bh,
2327 cpos, len, meta_ac, dealloc, delete);
2328 if (ret)
2329 mlog_errno(ret);
2330out:
2331 brelse(ref_root_bh);
2332 return ret;
2333}
2334
2335/*
2336 * Mark the already-existing extent at cpos as refcounted for len clusters.
2337 * This adds the refcount extent flag.
2338 *
2339 * If the existing extent is larger than the request, initiate a
2340 * split. An attempt will be made at merging with adjacent extents.
2341 *
2342 * The caller is responsible for passing down meta_ac if we'll need it.
2343 */
2344static int ocfs2_mark_extent_refcounted(struct inode *inode,
2345 struct ocfs2_extent_tree *et,
2346 handle_t *handle, u32 cpos,
2347 u32 len, u32 phys,
2348 struct ocfs2_alloc_context *meta_ac,
2349 struct ocfs2_cached_dealloc_ctxt *dealloc)
2350{
2351 int ret;
2352
2353 trace_ocfs2_mark_extent_refcounted(OCFS2_I(inode)->ip_blkno,
2354 cpos, len, phys);
2355
2356 if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb))) {
2357 ret = ocfs2_error(inode->i_sb, "Inode %lu want to use refcount tree, but the feature bit is not set in the super block\n",
2358 inode->i_ino);
2359 goto out;
2360 }
2361
2362 ret = ocfs2_change_extent_flag(handle, et, cpos,
2363 len, phys, meta_ac, dealloc,
2364 OCFS2_EXT_REFCOUNTED, 0);
2365 if (ret)
2366 mlog_errno(ret);
2367
2368out:
2369 return ret;
2370}
2371
2372/*
2373 * Given some contiguous physical clusters, calculate what we need
2374 * for modifying their refcount.
2375 */
2376static int ocfs2_calc_refcount_meta_credits(struct super_block *sb,
2377 struct ocfs2_caching_info *ci,
2378 struct buffer_head *ref_root_bh,
2379 u64 start_cpos,
2380 u32 clusters,
2381 int *meta_add,
2382 int *credits)
2383{
2384 int ret = 0, index, ref_blocks = 0, recs_add = 0;
2385 u64 cpos = start_cpos;
2386 struct ocfs2_refcount_block *rb;
2387 struct ocfs2_refcount_rec rec;
2388 struct buffer_head *ref_leaf_bh = NULL, *prev_bh = NULL;
2389 u32 len;
2390
2391 while (clusters) {
2392 ret = ocfs2_get_refcount_rec(ci, ref_root_bh,
2393 cpos, clusters, &rec,
2394 &index, &ref_leaf_bh);
2395 if (ret) {
2396 mlog_errno(ret);
2397 goto out;
2398 }
2399
2400 if (ref_leaf_bh != prev_bh) {
2401 /*
2402 * Now we encounter a new leaf block, so calculate
2403 * whether we need to extend the old leaf.
2404 */
2405 if (prev_bh) {
2406 rb = (struct ocfs2_refcount_block *)
2407 prev_bh->b_data;
2408
2409 if (le16_to_cpu(rb->rf_records.rl_used) +
2410 recs_add >
2411 le16_to_cpu(rb->rf_records.rl_count))
2412 ref_blocks++;
2413 }
2414
2415 recs_add = 0;
2416 *credits += 1;
2417 brelse(prev_bh);
2418 prev_bh = ref_leaf_bh;
2419 get_bh(prev_bh);
2420 }
2421
2422 trace_ocfs2_calc_refcount_meta_credits_iterate(
2423 recs_add, (unsigned long long)cpos, clusters,
2424 (unsigned long long)le64_to_cpu(rec.r_cpos),
2425 le32_to_cpu(rec.r_clusters),
2426 le32_to_cpu(rec.r_refcount), index);
2427
2428 len = min((u64)cpos + clusters, le64_to_cpu(rec.r_cpos) +
2429 le32_to_cpu(rec.r_clusters)) - cpos;
2430 /*
2431 * We record all the records which will be inserted to the
2432 * same refcount block, so that we can tell exactly whether
2433 * we need a new refcount block or not.
2434 *
2435 * If we will insert a new one, this is easy and only happens
2436 * during adding refcounted flag to the extent, so we don't
2437 * have a chance of spliting. We just need one record.
2438 *
2439 * If the refcount rec already exists, that would be a little
2440 * complicated. we may have to:
2441 * 1) split at the beginning if the start pos isn't aligned.
2442 * we need 1 more record in this case.
2443 * 2) split int the end if the end pos isn't aligned.
2444 * we need 1 more record in this case.
2445 * 3) split in the middle because of file system fragmentation.
2446 * we need 2 more records in this case(we can't detect this
2447 * beforehand, so always think of the worst case).
2448 */
2449 if (rec.r_refcount) {
2450 recs_add += 2;
2451 /* Check whether we need a split at the beginning. */
2452 if (cpos == start_cpos &&
2453 cpos != le64_to_cpu(rec.r_cpos))
2454 recs_add++;
2455
2456 /* Check whether we need a split in the end. */
2457 if (cpos + clusters < le64_to_cpu(rec.r_cpos) +
2458 le32_to_cpu(rec.r_clusters))
2459 recs_add++;
2460 } else
2461 recs_add++;
2462
2463 brelse(ref_leaf_bh);
2464 ref_leaf_bh = NULL;
2465 clusters -= len;
2466 cpos += len;
2467 }
2468
2469 if (prev_bh) {
2470 rb = (struct ocfs2_refcount_block *)prev_bh->b_data;
2471
2472 if (le16_to_cpu(rb->rf_records.rl_used) + recs_add >
2473 le16_to_cpu(rb->rf_records.rl_count))
2474 ref_blocks++;
2475
2476 *credits += 1;
2477 }
2478
2479 if (!ref_blocks)
2480 goto out;
2481
2482 *meta_add += ref_blocks;
2483 *credits += ref_blocks;
2484
2485 /*
2486 * So we may need ref_blocks to insert into the tree.
2487 * That also means we need to change the b-tree and add that number
2488 * of records since we never merge them.
2489 * We need one more block for expansion since the new created leaf
2490 * block is also full and needs split.
2491 */
2492 rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
2493 if (le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL) {
2494 struct ocfs2_extent_tree et;
2495
2496 ocfs2_init_refcount_extent_tree(&et, ci, ref_root_bh);
2497 *meta_add += ocfs2_extend_meta_needed(et.et_root_el);
2498 *credits += ocfs2_calc_extend_credits(sb,
2499 et.et_root_el);
2500 } else {
2501 *credits += OCFS2_EXPAND_REFCOUNT_TREE_CREDITS;
2502 *meta_add += 1;
2503 }
2504
2505out:
2506
2507 trace_ocfs2_calc_refcount_meta_credits(
2508 (unsigned long long)start_cpos, clusters,
2509 *meta_add, *credits);
2510 brelse(ref_leaf_bh);
2511 brelse(prev_bh);
2512 return ret;
2513}
2514
2515/*
2516 * For refcount tree, we will decrease some contiguous clusters
2517 * refcount count, so just go through it to see how many blocks
2518 * we gonna touch and whether we need to create new blocks.
2519 *
2520 * Normally the refcount blocks store these refcount should be
2521 * contiguous also, so that we can get the number easily.
2522 * We will at most add split 2 refcount records and 2 more
2523 * refcount blocks, so just check it in a rough way.
2524 *
2525 * Caller must hold refcount tree lock.
2526 */
2527int ocfs2_prepare_refcount_change_for_del(struct inode *inode,
2528 u64 refcount_loc,
2529 u64 phys_blkno,
2530 u32 clusters,
2531 int *credits,
2532 int *ref_blocks)
2533{
2534 int ret;
2535 struct buffer_head *ref_root_bh = NULL;
2536 struct ocfs2_refcount_tree *tree;
2537 u64 start_cpos = ocfs2_blocks_to_clusters(inode->i_sb, phys_blkno);
2538
2539 if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb))) {
2540 ret = ocfs2_error(inode->i_sb, "Inode %lu want to use refcount tree, but the feature bit is not set in the super block\n",
2541 inode->i_ino);
2542 goto out;
2543 }
2544
2545 BUG_ON(!ocfs2_is_refcount_inode(inode));
2546
2547 ret = ocfs2_get_refcount_tree(OCFS2_SB(inode->i_sb),
2548 refcount_loc, &tree);
2549 if (ret) {
2550 mlog_errno(ret);
2551 goto out;
2552 }
2553
2554 ret = ocfs2_read_refcount_block(&tree->rf_ci, refcount_loc,
2555 &ref_root_bh);
2556 if (ret) {
2557 mlog_errno(ret);
2558 goto out;
2559 }
2560
2561 ret = ocfs2_calc_refcount_meta_credits(inode->i_sb,
2562 &tree->rf_ci,
2563 ref_root_bh,
2564 start_cpos, clusters,
2565 ref_blocks, credits);
2566 if (ret) {
2567 mlog_errno(ret);
2568 goto out;
2569 }
2570
2571 trace_ocfs2_prepare_refcount_change_for_del(*ref_blocks, *credits);
2572
2573out:
2574 brelse(ref_root_bh);
2575 return ret;
2576}
2577
2578#define MAX_CONTIG_BYTES 1048576
2579
2580static inline unsigned int ocfs2_cow_contig_clusters(struct super_block *sb)
2581{
2582 return ocfs2_clusters_for_bytes(sb, MAX_CONTIG_BYTES);
2583}
2584
2585static inline unsigned int ocfs2_cow_contig_mask(struct super_block *sb)
2586{
2587 return ~(ocfs2_cow_contig_clusters(sb) - 1);
2588}
2589
2590/*
2591 * Given an extent that starts at 'start' and an I/O that starts at 'cpos',
2592 * find an offset (start + (n * contig_clusters)) that is closest to cpos
2593 * while still being less than or equal to it.
2594 *
2595 * The goal is to break the extent at a multiple of contig_clusters.
2596 */
2597static inline unsigned int ocfs2_cow_align_start(struct super_block *sb,
2598 unsigned int start,
2599 unsigned int cpos)
2600{
2601 BUG_ON(start > cpos);
2602
2603 return start + ((cpos - start) & ocfs2_cow_contig_mask(sb));
2604}
2605
2606/*
2607 * Given a cluster count of len, pad it out so that it is a multiple
2608 * of contig_clusters.
2609 */
2610static inline unsigned int ocfs2_cow_align_length(struct super_block *sb,
2611 unsigned int len)
2612{
2613 unsigned int padded =
2614 (len + (ocfs2_cow_contig_clusters(sb) - 1)) &
2615 ocfs2_cow_contig_mask(sb);
2616
2617 /* Did we wrap? */
2618 if (padded < len)
2619 padded = UINT_MAX;
2620
2621 return padded;
2622}
2623
2624/*
2625 * Calculate out the start and number of virtual clusters we need to to CoW.
2626 *
2627 * cpos is vitual start cluster position we want to do CoW in a
2628 * file and write_len is the cluster length.
2629 * max_cpos is the place where we want to stop CoW intentionally.
2630 *
2631 * Normal we will start CoW from the beginning of extent record cotaining cpos.
2632 * We try to break up extents on boundaries of MAX_CONTIG_BYTES so that we
2633 * get good I/O from the resulting extent tree.
2634 */
2635static int ocfs2_refcount_cal_cow_clusters(struct inode *inode,
2636 struct ocfs2_extent_list *el,
2637 u32 cpos,
2638 u32 write_len,
2639 u32 max_cpos,
2640 u32 *cow_start,
2641 u32 *cow_len)
2642{
2643 int ret = 0;
2644 int tree_height = le16_to_cpu(el->l_tree_depth), i;
2645 struct buffer_head *eb_bh = NULL;
2646 struct ocfs2_extent_block *eb = NULL;
2647 struct ocfs2_extent_rec *rec;
2648 unsigned int want_clusters, rec_end = 0;
2649 int contig_clusters = ocfs2_cow_contig_clusters(inode->i_sb);
2650 int leaf_clusters;
2651
2652 BUG_ON(cpos + write_len > max_cpos);
2653
2654 if (tree_height > 0) {
2655 ret = ocfs2_find_leaf(INODE_CACHE(inode), el, cpos, &eb_bh);
2656 if (ret) {
2657 mlog_errno(ret);
2658 goto out;
2659 }
2660
2661 eb = (struct ocfs2_extent_block *) eb_bh->b_data;
2662 el = &eb->h_list;
2663
2664 if (el->l_tree_depth) {
2665 ret = ocfs2_error(inode->i_sb,
2666 "Inode %lu has non zero tree depth in leaf block %llu\n",
2667 inode->i_ino,
2668 (unsigned long long)eb_bh->b_blocknr);
2669 goto out;
2670 }
2671 }
2672
2673 *cow_len = 0;
2674 for (i = 0; i < le16_to_cpu(el->l_next_free_rec); i++) {
2675 rec = &el->l_recs[i];
2676
2677 if (ocfs2_is_empty_extent(rec)) {
2678 mlog_bug_on_msg(i != 0, "Inode %lu has empty record in "
2679 "index %d\n", inode->i_ino, i);
2680 continue;
2681 }
2682
2683 if (le32_to_cpu(rec->e_cpos) +
2684 le16_to_cpu(rec->e_leaf_clusters) <= cpos)
2685 continue;
2686
2687 if (*cow_len == 0) {
2688 /*
2689 * We should find a refcounted record in the
2690 * first pass.
2691 */
2692 BUG_ON(!(rec->e_flags & OCFS2_EXT_REFCOUNTED));
2693 *cow_start = le32_to_cpu(rec->e_cpos);
2694 }
2695
2696 /*
2697 * If we encounter a hole, a non-refcounted record or
2698 * pass the max_cpos, stop the search.
2699 */
2700 if ((!(rec->e_flags & OCFS2_EXT_REFCOUNTED)) ||
2701 (*cow_len && rec_end != le32_to_cpu(rec->e_cpos)) ||
2702 (max_cpos <= le32_to_cpu(rec->e_cpos)))
2703 break;
2704
2705 leaf_clusters = le16_to_cpu(rec->e_leaf_clusters);
2706 rec_end = le32_to_cpu(rec->e_cpos) + leaf_clusters;
2707 if (rec_end > max_cpos) {
2708 rec_end = max_cpos;
2709 leaf_clusters = rec_end - le32_to_cpu(rec->e_cpos);
2710 }
2711
2712 /*
2713 * How many clusters do we actually need from
2714 * this extent? First we see how many we actually
2715 * need to complete the write. If that's smaller
2716 * than contig_clusters, we try for contig_clusters.
2717 */
2718 if (!*cow_len)
2719 want_clusters = write_len;
2720 else
2721 want_clusters = (cpos + write_len) -
2722 (*cow_start + *cow_len);
2723 if (want_clusters < contig_clusters)
2724 want_clusters = contig_clusters;
2725
2726 /*
2727 * If the write does not cover the whole extent, we
2728 * need to calculate how we're going to split the extent.
2729 * We try to do it on contig_clusters boundaries.
2730 *
2731 * Any extent smaller than contig_clusters will be
2732 * CoWed in its entirety.
2733 */
2734 if (leaf_clusters <= contig_clusters)
2735 *cow_len += leaf_clusters;
2736 else if (*cow_len || (*cow_start == cpos)) {
2737 /*
2738 * This extent needs to be CoW'd from its
2739 * beginning, so all we have to do is compute
2740 * how many clusters to grab. We align
2741 * want_clusters to the edge of contig_clusters
2742 * to get better I/O.
2743 */
2744 want_clusters = ocfs2_cow_align_length(inode->i_sb,
2745 want_clusters);
2746
2747 if (leaf_clusters < want_clusters)
2748 *cow_len += leaf_clusters;
2749 else
2750 *cow_len += want_clusters;
2751 } else if ((*cow_start + contig_clusters) >=
2752 (cpos + write_len)) {
2753 /*
2754 * Breaking off contig_clusters at the front
2755 * of the extent will cover our write. That's
2756 * easy.
2757 */
2758 *cow_len = contig_clusters;
2759 } else if ((rec_end - cpos) <= contig_clusters) {
2760 /*
2761 * Breaking off contig_clusters at the tail of
2762 * this extent will cover cpos.
2763 */
2764 *cow_start = rec_end - contig_clusters;
2765 *cow_len = contig_clusters;
2766 } else if ((rec_end - cpos) <= want_clusters) {
2767 /*
2768 * While we can't fit the entire write in this
2769 * extent, we know that the write goes from cpos
2770 * to the end of the extent. Break that off.
2771 * We try to break it at some multiple of
2772 * contig_clusters from the front of the extent.
2773 * Failing that (ie, cpos is within
2774 * contig_clusters of the front), we'll CoW the
2775 * entire extent.
2776 */
2777 *cow_start = ocfs2_cow_align_start(inode->i_sb,
2778 *cow_start, cpos);
2779 *cow_len = rec_end - *cow_start;
2780 } else {
2781 /*
2782 * Ok, the entire write lives in the middle of
2783 * this extent. Let's try to slice the extent up
2784 * nicely. Optimally, our CoW region starts at
2785 * m*contig_clusters from the beginning of the
2786 * extent and goes for n*contig_clusters,
2787 * covering the entire write.
2788 */
2789 *cow_start = ocfs2_cow_align_start(inode->i_sb,
2790 *cow_start, cpos);
2791
2792 want_clusters = (cpos + write_len) - *cow_start;
2793 want_clusters = ocfs2_cow_align_length(inode->i_sb,
2794 want_clusters);
2795 if (*cow_start + want_clusters <= rec_end)
2796 *cow_len = want_clusters;
2797 else
2798 *cow_len = rec_end - *cow_start;
2799 }
2800
2801 /* Have we covered our entire write yet? */
2802 if ((*cow_start + *cow_len) >= (cpos + write_len))
2803 break;
2804
2805 /*
2806 * If we reach the end of the extent block and don't get enough
2807 * clusters, continue with the next extent block if possible.
2808 */
2809 if (i + 1 == le16_to_cpu(el->l_next_free_rec) &&
2810 eb && eb->h_next_leaf_blk) {
2811 brelse(eb_bh);
2812 eb_bh = NULL;
2813
2814 ret = ocfs2_read_extent_block(INODE_CACHE(inode),
2815 le64_to_cpu(eb->h_next_leaf_blk),
2816 &eb_bh);
2817 if (ret) {
2818 mlog_errno(ret);
2819 goto out;
2820 }
2821
2822 eb = (struct ocfs2_extent_block *) eb_bh->b_data;
2823 el = &eb->h_list;
2824 i = -1;
2825 }
2826 }
2827
2828out:
2829 brelse(eb_bh);
2830 return ret;
2831}
2832
2833/*
2834 * Prepare meta_ac, data_ac and calculate credits when we want to add some
2835 * num_clusters in data_tree "et" and change the refcount for the old
2836 * clusters(starting form p_cluster) in the refcount tree.
2837 *
2838 * Note:
2839 * 1. since we may split the old tree, so we at most will need num_clusters + 2
2840 * more new leaf records.
2841 * 2. In some case, we may not need to reserve new clusters(e.g, reflink), so
2842 * just give data_ac = NULL.
2843 */
2844static int ocfs2_lock_refcount_allocators(struct super_block *sb,
2845 u32 p_cluster, u32 num_clusters,
2846 struct ocfs2_extent_tree *et,
2847 struct ocfs2_caching_info *ref_ci,
2848 struct buffer_head *ref_root_bh,
2849 struct ocfs2_alloc_context **meta_ac,
2850 struct ocfs2_alloc_context **data_ac,
2851 int *credits)
2852{
2853 int ret = 0, meta_add = 0;
2854 int num_free_extents = ocfs2_num_free_extents(OCFS2_SB(sb), et);
2855
2856 if (num_free_extents < 0) {
2857 ret = num_free_extents;
2858 mlog_errno(ret);
2859 goto out;
2860 }
2861
2862 if (num_free_extents < num_clusters + 2)
2863 meta_add =
2864 ocfs2_extend_meta_needed(et->et_root_el);
2865
2866 *credits += ocfs2_calc_extend_credits(sb, et->et_root_el);
2867
2868 ret = ocfs2_calc_refcount_meta_credits(sb, ref_ci, ref_root_bh,
2869 p_cluster, num_clusters,
2870 &meta_add, credits);
2871 if (ret) {
2872 mlog_errno(ret);
2873 goto out;
2874 }
2875
2876 trace_ocfs2_lock_refcount_allocators(meta_add, *credits);
2877 ret = ocfs2_reserve_new_metadata_blocks(OCFS2_SB(sb), meta_add,
2878 meta_ac);
2879 if (ret) {
2880 mlog_errno(ret);
2881 goto out;
2882 }
2883
2884 if (data_ac) {
2885 ret = ocfs2_reserve_clusters(OCFS2_SB(sb), num_clusters,
2886 data_ac);
2887 if (ret)
2888 mlog_errno(ret);
2889 }
2890
2891out:
2892 if (ret) {
2893 if (*meta_ac) {
2894 ocfs2_free_alloc_context(*meta_ac);
2895 *meta_ac = NULL;
2896 }
2897 }
2898
2899 return ret;
2900}
2901
2902static int ocfs2_clear_cow_buffer(handle_t *handle, struct buffer_head *bh)
2903{
2904 BUG_ON(buffer_dirty(bh));
2905
2906 clear_buffer_mapped(bh);
2907
2908 return 0;
2909}
2910
2911int ocfs2_duplicate_clusters_by_page(handle_t *handle,
2912 struct inode *inode,
2913 u32 cpos, u32 old_cluster,
2914 u32 new_cluster, u32 new_len)
2915{
2916 int ret = 0, partial;
2917 struct super_block *sb = inode->i_sb;
2918 u64 new_block = ocfs2_clusters_to_blocks(sb, new_cluster);
2919 struct page *page;
2920 pgoff_t page_index;
2921 unsigned int from, to;
2922 loff_t offset, end, map_end;
2923 struct address_space *mapping = inode->i_mapping;
2924
2925 trace_ocfs2_duplicate_clusters_by_page(cpos, old_cluster,
2926 new_cluster, new_len);
2927
2928 offset = ((loff_t)cpos) << OCFS2_SB(sb)->s_clustersize_bits;
2929 end = offset + (new_len << OCFS2_SB(sb)->s_clustersize_bits);
2930 /*
2931 * We only duplicate pages until we reach the page contains i_size - 1.
2932 * So trim 'end' to i_size.
2933 */
2934 if (end > i_size_read(inode))
2935 end = i_size_read(inode);
2936
2937 while (offset < end) {
2938 page_index = offset >> PAGE_SHIFT;
2939 map_end = ((loff_t)page_index + 1) << PAGE_SHIFT;
2940 if (map_end > end)
2941 map_end = end;
2942
2943 /* from, to is the offset within the page. */
2944 from = offset & (PAGE_SIZE - 1);
2945 to = PAGE_SIZE;
2946 if (map_end & (PAGE_SIZE - 1))
2947 to = map_end & (PAGE_SIZE - 1);
2948
2949 page = find_or_create_page(mapping, page_index, GFP_NOFS);
2950 if (!page) {
2951 ret = -ENOMEM;
2952 mlog_errno(ret);
2953 break;
2954 }
2955
2956 /*
2957 * In case PAGE_SIZE <= CLUSTER_SIZE, This page
2958 * can't be dirtied before we CoW it out.
2959 */
2960 if (PAGE_SIZE <= OCFS2_SB(sb)->s_clustersize)
2961 BUG_ON(PageDirty(page));
2962
2963 if (!PageUptodate(page)) {
2964 ret = block_read_full_page(page, ocfs2_get_block);
2965 if (ret) {
2966 mlog_errno(ret);
2967 goto unlock;
2968 }
2969 lock_page(page);
2970 }
2971
2972 if (page_has_buffers(page)) {
2973 ret = walk_page_buffers(handle, page_buffers(page),
2974 from, to, &partial,
2975 ocfs2_clear_cow_buffer);
2976 if (ret) {
2977 mlog_errno(ret);
2978 goto unlock;
2979 }
2980 }
2981
2982 ocfs2_map_and_dirty_page(inode,
2983 handle, from, to,
2984 page, 0, &new_block);
2985 mark_page_accessed(page);
2986unlock:
2987 unlock_page(page);
2988 put_page(page);
2989 page = NULL;
2990 offset = map_end;
2991 if (ret)
2992 break;
2993 }
2994
2995 return ret;
2996}
2997
2998int ocfs2_duplicate_clusters_by_jbd(handle_t *handle,
2999 struct inode *inode,
3000 u32 cpos, u32 old_cluster,
3001 u32 new_cluster, u32 new_len)
3002{
3003 int ret = 0;
3004 struct super_block *sb = inode->i_sb;
3005 struct ocfs2_caching_info *ci = INODE_CACHE(inode);
3006 int i, blocks = ocfs2_clusters_to_blocks(sb, new_len);
3007 u64 old_block = ocfs2_clusters_to_blocks(sb, old_cluster);
3008 u64 new_block = ocfs2_clusters_to_blocks(sb, new_cluster);
3009 struct ocfs2_super *osb = OCFS2_SB(sb);
3010 struct buffer_head *old_bh = NULL;
3011 struct buffer_head *new_bh = NULL;
3012
3013 trace_ocfs2_duplicate_clusters_by_page(cpos, old_cluster,
3014 new_cluster, new_len);
3015
3016 for (i = 0; i < blocks; i++, old_block++, new_block++) {
3017 new_bh = sb_getblk(osb->sb, new_block);
3018 if (new_bh == NULL) {
3019 ret = -ENOMEM;
3020 mlog_errno(ret);
3021 break;
3022 }
3023
3024 ocfs2_set_new_buffer_uptodate(ci, new_bh);
3025
3026 ret = ocfs2_read_block(ci, old_block, &old_bh, NULL);
3027 if (ret) {
3028 mlog_errno(ret);
3029 break;
3030 }
3031
3032 ret = ocfs2_journal_access(handle, ci, new_bh,
3033 OCFS2_JOURNAL_ACCESS_CREATE);
3034 if (ret) {
3035 mlog_errno(ret);
3036 break;
3037 }
3038
3039 memcpy(new_bh->b_data, old_bh->b_data, sb->s_blocksize);
3040 ocfs2_journal_dirty(handle, new_bh);
3041
3042 brelse(new_bh);
3043 brelse(old_bh);
3044 new_bh = NULL;
3045 old_bh = NULL;
3046 }
3047
3048 brelse(new_bh);
3049 brelse(old_bh);
3050 return ret;
3051}
3052
3053static int ocfs2_clear_ext_refcount(handle_t *handle,
3054 struct ocfs2_extent_tree *et,
3055 u32 cpos, u32 p_cluster, u32 len,
3056 unsigned int ext_flags,
3057 struct ocfs2_alloc_context *meta_ac,
3058 struct ocfs2_cached_dealloc_ctxt *dealloc)
3059{
3060 int ret, index;
3061 struct ocfs2_extent_rec replace_rec;
3062 struct ocfs2_path *path = NULL;
3063 struct ocfs2_extent_list *el;
3064 struct super_block *sb = ocfs2_metadata_cache_get_super(et->et_ci);
3065 u64 ino = ocfs2_metadata_cache_owner(et->et_ci);
3066
3067 trace_ocfs2_clear_ext_refcount((unsigned long long)ino,
3068 cpos, len, p_cluster, ext_flags);
3069
3070 memset(&replace_rec, 0, sizeof(replace_rec));
3071 replace_rec.e_cpos = cpu_to_le32(cpos);
3072 replace_rec.e_leaf_clusters = cpu_to_le16(len);
3073 replace_rec.e_blkno = cpu_to_le64(ocfs2_clusters_to_blocks(sb,
3074 p_cluster));
3075 replace_rec.e_flags = ext_flags;
3076 replace_rec.e_flags &= ~OCFS2_EXT_REFCOUNTED;
3077
3078 path = ocfs2_new_path_from_et(et);
3079 if (!path) {
3080 ret = -ENOMEM;
3081 mlog_errno(ret);
3082 goto out;
3083 }
3084
3085 ret = ocfs2_find_path(et->et_ci, path, cpos);
3086 if (ret) {
3087 mlog_errno(ret);
3088 goto out;
3089 }
3090
3091 el = path_leaf_el(path);
3092
3093 index = ocfs2_search_extent_list(el, cpos);
3094 if (index == -1) {
3095 ret = ocfs2_error(sb,
3096 "Inode %llu has an extent at cpos %u which can no longer be found\n",
3097 (unsigned long long)ino, cpos);
3098 goto out;
3099 }
3100
3101 ret = ocfs2_split_extent(handle, et, path, index,
3102 &replace_rec, meta_ac, dealloc);
3103 if (ret)
3104 mlog_errno(ret);
3105
3106out:
3107 ocfs2_free_path(path);
3108 return ret;
3109}
3110
3111static int ocfs2_replace_clusters(handle_t *handle,
3112 struct ocfs2_cow_context *context,
3113 u32 cpos, u32 old,
3114 u32 new, u32 len,
3115 unsigned int ext_flags)
3116{
3117 int ret;
3118 struct ocfs2_caching_info *ci = context->data_et.et_ci;
3119 u64 ino = ocfs2_metadata_cache_owner(ci);
3120
3121 trace_ocfs2_replace_clusters((unsigned long long)ino,
3122 cpos, old, new, len, ext_flags);
3123
3124 /*If the old clusters is unwritten, no need to duplicate. */
3125 if (!(ext_flags & OCFS2_EXT_UNWRITTEN)) {
3126 ret = context->cow_duplicate_clusters(handle, context->inode,
3127 cpos, old, new, len);
3128 if (ret) {
3129 mlog_errno(ret);
3130 goto out;
3131 }
3132 }
3133
3134 ret = ocfs2_clear_ext_refcount(handle, &context->data_et,
3135 cpos, new, len, ext_flags,
3136 context->meta_ac, &context->dealloc);
3137 if (ret)
3138 mlog_errno(ret);
3139out:
3140 return ret;
3141}
3142
3143int ocfs2_cow_sync_writeback(struct super_block *sb,
3144 struct inode *inode,
3145 u32 cpos, u32 num_clusters)
3146{
3147 int ret = 0;
3148 loff_t offset, end, map_end;
3149 pgoff_t page_index;
3150 struct page *page;
3151
3152 if (ocfs2_should_order_data(inode))
3153 return 0;
3154
3155 offset = ((loff_t)cpos) << OCFS2_SB(sb)->s_clustersize_bits;
3156 end = offset + (num_clusters << OCFS2_SB(sb)->s_clustersize_bits);
3157
3158 ret = filemap_fdatawrite_range(inode->i_mapping,
3159 offset, end - 1);
3160 if (ret < 0) {
3161 mlog_errno(ret);
3162 return ret;
3163 }
3164
3165 while (offset < end) {
3166 page_index = offset >> PAGE_SHIFT;
3167 map_end = ((loff_t)page_index + 1) << PAGE_SHIFT;
3168 if (map_end > end)
3169 map_end = end;
3170
3171 page = find_or_create_page(inode->i_mapping,
3172 page_index, GFP_NOFS);
3173 BUG_ON(!page);
3174
3175 wait_on_page_writeback(page);
3176 if (PageError(page)) {
3177 ret = -EIO;
3178 mlog_errno(ret);
3179 } else
3180 mark_page_accessed(page);
3181
3182 unlock_page(page);
3183 put_page(page);
3184 page = NULL;
3185 offset = map_end;
3186 if (ret)
3187 break;
3188 }
3189
3190 return ret;
3191}
3192
3193static int ocfs2_di_get_clusters(struct ocfs2_cow_context *context,
3194 u32 v_cluster, u32 *p_cluster,
3195 u32 *num_clusters,
3196 unsigned int *extent_flags)
3197{
3198 return ocfs2_get_clusters(context->inode, v_cluster, p_cluster,
3199 num_clusters, extent_flags);
3200}
3201
3202static int ocfs2_make_clusters_writable(struct super_block *sb,
3203 struct ocfs2_cow_context *context,
3204 u32 cpos, u32 p_cluster,
3205 u32 num_clusters, unsigned int e_flags)
3206{
3207 int ret, delete, index, credits = 0;
3208 u32 new_bit, new_len, orig_num_clusters;
3209 unsigned int set_len;
3210 struct ocfs2_super *osb = OCFS2_SB(sb);
3211 handle_t *handle;
3212 struct buffer_head *ref_leaf_bh = NULL;
3213 struct ocfs2_caching_info *ref_ci = &context->ref_tree->rf_ci;
3214 struct ocfs2_refcount_rec rec;
3215
3216 trace_ocfs2_make_clusters_writable(cpos, p_cluster,
3217 num_clusters, e_flags);
3218
3219 ret = ocfs2_lock_refcount_allocators(sb, p_cluster, num_clusters,
3220 &context->data_et,
3221 ref_ci,
3222 context->ref_root_bh,
3223 &context->meta_ac,
3224 &context->data_ac, &credits);
3225 if (ret) {
3226 mlog_errno(ret);
3227 return ret;
3228 }
3229
3230 if (context->post_refcount)
3231 credits += context->post_refcount->credits;
3232
3233 credits += context->extra_credits;
3234 handle = ocfs2_start_trans(osb, credits);
3235 if (IS_ERR(handle)) {
3236 ret = PTR_ERR(handle);
3237 mlog_errno(ret);
3238 goto out;
3239 }
3240
3241 orig_num_clusters = num_clusters;
3242
3243 while (num_clusters) {
3244 ret = ocfs2_get_refcount_rec(ref_ci, context->ref_root_bh,
3245 p_cluster, num_clusters,
3246 &rec, &index, &ref_leaf_bh);
3247 if (ret) {
3248 mlog_errno(ret);
3249 goto out_commit;
3250 }
3251
3252 BUG_ON(!rec.r_refcount);
3253 set_len = min((u64)p_cluster + num_clusters,
3254 le64_to_cpu(rec.r_cpos) +
3255 le32_to_cpu(rec.r_clusters)) - p_cluster;
3256
3257 /*
3258 * There are many different situation here.
3259 * 1. If refcount == 1, remove the flag and don't COW.
3260 * 2. If refcount > 1, allocate clusters.
3261 * Here we may not allocate r_len once at a time, so continue
3262 * until we reach num_clusters.
3263 */
3264 if (le32_to_cpu(rec.r_refcount) == 1) {
3265 delete = 0;
3266 ret = ocfs2_clear_ext_refcount(handle,
3267 &context->data_et,
3268 cpos, p_cluster,
3269 set_len, e_flags,
3270 context->meta_ac,
3271 &context->dealloc);
3272 if (ret) {
3273 mlog_errno(ret);
3274 goto out_commit;
3275 }
3276 } else {
3277 delete = 1;
3278
3279 ret = __ocfs2_claim_clusters(handle,
3280 context->data_ac,
3281 1, set_len,
3282 &new_bit, &new_len);
3283 if (ret) {
3284 mlog_errno(ret);
3285 goto out_commit;
3286 }
3287
3288 ret = ocfs2_replace_clusters(handle, context,
3289 cpos, p_cluster, new_bit,
3290 new_len, e_flags);
3291 if (ret) {
3292 mlog_errno(ret);
3293 goto out_commit;
3294 }
3295 set_len = new_len;
3296 }
3297
3298 ret = __ocfs2_decrease_refcount(handle, ref_ci,
3299 context->ref_root_bh,
3300 p_cluster, set_len,
3301 context->meta_ac,
3302 &context->dealloc, delete);
3303 if (ret) {
3304 mlog_errno(ret);
3305 goto out_commit;
3306 }
3307
3308 cpos += set_len;
3309 p_cluster += set_len;
3310 num_clusters -= set_len;
3311 brelse(ref_leaf_bh);
3312 ref_leaf_bh = NULL;
3313 }
3314
3315 /* handle any post_cow action. */
3316 if (context->post_refcount && context->post_refcount->func) {
3317 ret = context->post_refcount->func(context->inode, handle,
3318 context->post_refcount->para);
3319 if (ret) {
3320 mlog_errno(ret);
3321 goto out_commit;
3322 }
3323 }
3324
3325 /*
3326 * Here we should write the new page out first if we are
3327 * in write-back mode.
3328 */
3329 if (context->get_clusters == ocfs2_di_get_clusters) {
3330 ret = ocfs2_cow_sync_writeback(sb, context->inode, cpos,
3331 orig_num_clusters);
3332 if (ret)
3333 mlog_errno(ret);
3334 }
3335
3336out_commit:
3337 ocfs2_commit_trans(osb, handle);
3338
3339out:
3340 if (context->data_ac) {
3341 ocfs2_free_alloc_context(context->data_ac);
3342 context->data_ac = NULL;
3343 }
3344 if (context->meta_ac) {
3345 ocfs2_free_alloc_context(context->meta_ac);
3346 context->meta_ac = NULL;
3347 }
3348 brelse(ref_leaf_bh);
3349
3350 return ret;
3351}
3352
3353static int ocfs2_replace_cow(struct ocfs2_cow_context *context)
3354{
3355 int ret = 0;
3356 struct inode *inode = context->inode;
3357 u32 cow_start = context->cow_start, cow_len = context->cow_len;
3358 u32 p_cluster, num_clusters;
3359 unsigned int ext_flags;
3360 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3361
3362 if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb))) {
3363 return ocfs2_error(inode->i_sb, "Inode %lu want to use refcount tree, but the feature bit is not set in the super block\n",
3364 inode->i_ino);
3365 }
3366
3367 ocfs2_init_dealloc_ctxt(&context->dealloc);
3368
3369 while (cow_len) {
3370 ret = context->get_clusters(context, cow_start, &p_cluster,
3371 &num_clusters, &ext_flags);
3372 if (ret) {
3373 mlog_errno(ret);
3374 break;
3375 }
3376
3377 BUG_ON(!(ext_flags & OCFS2_EXT_REFCOUNTED));
3378
3379 if (cow_len < num_clusters)
3380 num_clusters = cow_len;
3381
3382 ret = ocfs2_make_clusters_writable(inode->i_sb, context,
3383 cow_start, p_cluster,
3384 num_clusters, ext_flags);
3385 if (ret) {
3386 mlog_errno(ret);
3387 break;
3388 }
3389
3390 cow_len -= num_clusters;
3391 cow_start += num_clusters;
3392 }
3393
3394 if (ocfs2_dealloc_has_cluster(&context->dealloc)) {
3395 ocfs2_schedule_truncate_log_flush(osb, 1);
3396 ocfs2_run_deallocs(osb, &context->dealloc);
3397 }
3398
3399 return ret;
3400}
3401
3402/*
3403 * Starting at cpos, try to CoW write_len clusters. Don't CoW
3404 * past max_cpos. This will stop when it runs into a hole or an
3405 * unrefcounted extent.
3406 */
3407static int ocfs2_refcount_cow_hunk(struct inode *inode,
3408 struct buffer_head *di_bh,
3409 u32 cpos, u32 write_len, u32 max_cpos)
3410{
3411 int ret;
3412 u32 cow_start = 0, cow_len = 0;
3413 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3414 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
3415 struct buffer_head *ref_root_bh = NULL;
3416 struct ocfs2_refcount_tree *ref_tree;
3417 struct ocfs2_cow_context *context = NULL;
3418
3419 BUG_ON(!ocfs2_is_refcount_inode(inode));
3420
3421 ret = ocfs2_refcount_cal_cow_clusters(inode, &di->id2.i_list,
3422 cpos, write_len, max_cpos,
3423 &cow_start, &cow_len);
3424 if (ret) {
3425 mlog_errno(ret);
3426 goto out;
3427 }
3428
3429 trace_ocfs2_refcount_cow_hunk(OCFS2_I(inode)->ip_blkno,
3430 cpos, write_len, max_cpos,
3431 cow_start, cow_len);
3432
3433 BUG_ON(cow_len == 0);
3434
3435 context = kzalloc(sizeof(struct ocfs2_cow_context), GFP_NOFS);
3436 if (!context) {
3437 ret = -ENOMEM;
3438 mlog_errno(ret);
3439 goto out;
3440 }
3441
3442 ret = ocfs2_lock_refcount_tree(osb, le64_to_cpu(di->i_refcount_loc),
3443 1, &ref_tree, &ref_root_bh);
3444 if (ret) {
3445 mlog_errno(ret);
3446 goto out;
3447 }
3448
3449 context->inode = inode;
3450 context->cow_start = cow_start;
3451 context->cow_len = cow_len;
3452 context->ref_tree = ref_tree;
3453 context->ref_root_bh = ref_root_bh;
3454 context->cow_duplicate_clusters = ocfs2_duplicate_clusters_by_page;
3455 context->get_clusters = ocfs2_di_get_clusters;
3456
3457 ocfs2_init_dinode_extent_tree(&context->data_et,
3458 INODE_CACHE(inode), di_bh);
3459
3460 ret = ocfs2_replace_cow(context);
3461 if (ret)
3462 mlog_errno(ret);
3463
3464 /*
3465 * truncate the extent map here since no matter whether we meet with
3466 * any error during the action, we shouldn't trust cached extent map
3467 * any more.
3468 */
3469 ocfs2_extent_map_trunc(inode, cow_start);
3470
3471 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
3472 brelse(ref_root_bh);
3473out:
3474 kfree(context);
3475 return ret;
3476}
3477
3478/*
3479 * CoW any and all clusters between cpos and cpos+write_len.
3480 * Don't CoW past max_cpos. If this returns successfully, all
3481 * clusters between cpos and cpos+write_len are safe to modify.
3482 */
3483int ocfs2_refcount_cow(struct inode *inode,
3484 struct buffer_head *di_bh,
3485 u32 cpos, u32 write_len, u32 max_cpos)
3486{
3487 int ret = 0;
3488 u32 p_cluster, num_clusters;
3489 unsigned int ext_flags;
3490
3491 while (write_len) {
3492 ret = ocfs2_get_clusters(inode, cpos, &p_cluster,
3493 &num_clusters, &ext_flags);
3494 if (ret) {
3495 mlog_errno(ret);
3496 break;
3497 }
3498
3499 if (write_len < num_clusters)
3500 num_clusters = write_len;
3501
3502 if (ext_flags & OCFS2_EXT_REFCOUNTED) {
3503 ret = ocfs2_refcount_cow_hunk(inode, di_bh, cpos,
3504 num_clusters, max_cpos);
3505 if (ret) {
3506 mlog_errno(ret);
3507 break;
3508 }
3509 }
3510
3511 write_len -= num_clusters;
3512 cpos += num_clusters;
3513 }
3514
3515 return ret;
3516}
3517
3518static int ocfs2_xattr_value_get_clusters(struct ocfs2_cow_context *context,
3519 u32 v_cluster, u32 *p_cluster,
3520 u32 *num_clusters,
3521 unsigned int *extent_flags)
3522{
3523 struct inode *inode = context->inode;
3524 struct ocfs2_xattr_value_root *xv = context->cow_object;
3525
3526 return ocfs2_xattr_get_clusters(inode, v_cluster, p_cluster,
3527 num_clusters, &xv->xr_list,
3528 extent_flags);
3529}
3530
3531/*
3532 * Given a xattr value root, calculate the most meta/credits we need for
3533 * refcount tree change if we truncate it to 0.
3534 */
3535int ocfs2_refcounted_xattr_delete_need(struct inode *inode,
3536 struct ocfs2_caching_info *ref_ci,
3537 struct buffer_head *ref_root_bh,
3538 struct ocfs2_xattr_value_root *xv,
3539 int *meta_add, int *credits)
3540{
3541 int ret = 0, index, ref_blocks = 0;
3542 u32 p_cluster, num_clusters;
3543 u32 cpos = 0, clusters = le32_to_cpu(xv->xr_clusters);
3544 struct ocfs2_refcount_block *rb;
3545 struct ocfs2_refcount_rec rec;
3546 struct buffer_head *ref_leaf_bh = NULL;
3547
3548 while (cpos < clusters) {
3549 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
3550 &num_clusters, &xv->xr_list,
3551 NULL);
3552 if (ret) {
3553 mlog_errno(ret);
3554 goto out;
3555 }
3556
3557 cpos += num_clusters;
3558
3559 while (num_clusters) {
3560 ret = ocfs2_get_refcount_rec(ref_ci, ref_root_bh,
3561 p_cluster, num_clusters,
3562 &rec, &index,
3563 &ref_leaf_bh);
3564 if (ret) {
3565 mlog_errno(ret);
3566 goto out;
3567 }
3568
3569 BUG_ON(!rec.r_refcount);
3570
3571 rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
3572
3573 /*
3574 * We really don't know whether the other clusters is in
3575 * this refcount block or not, so just take the worst
3576 * case that all the clusters are in this block and each
3577 * one will split a refcount rec, so totally we need
3578 * clusters * 2 new refcount rec.
3579 */
3580 if (le16_to_cpu(rb->rf_records.rl_used) + clusters * 2 >
3581 le16_to_cpu(rb->rf_records.rl_count))
3582 ref_blocks++;
3583
3584 *credits += 1;
3585 brelse(ref_leaf_bh);
3586 ref_leaf_bh = NULL;
3587
3588 if (num_clusters <= le32_to_cpu(rec.r_clusters))
3589 break;
3590 else
3591 num_clusters -= le32_to_cpu(rec.r_clusters);
3592 p_cluster += num_clusters;
3593 }
3594 }
3595
3596 *meta_add += ref_blocks;
3597 if (!ref_blocks)
3598 goto out;
3599
3600 rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
3601 if (le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL)
3602 *credits += OCFS2_EXPAND_REFCOUNT_TREE_CREDITS;
3603 else {
3604 struct ocfs2_extent_tree et;
3605
3606 ocfs2_init_refcount_extent_tree(&et, ref_ci, ref_root_bh);
3607 *credits += ocfs2_calc_extend_credits(inode->i_sb,
3608 et.et_root_el);
3609 }
3610
3611out:
3612 brelse(ref_leaf_bh);
3613 return ret;
3614}
3615
3616/*
3617 * Do CoW for xattr.
3618 */
3619int ocfs2_refcount_cow_xattr(struct inode *inode,
3620 struct ocfs2_dinode *di,
3621 struct ocfs2_xattr_value_buf *vb,
3622 struct ocfs2_refcount_tree *ref_tree,
3623 struct buffer_head *ref_root_bh,
3624 u32 cpos, u32 write_len,
3625 struct ocfs2_post_refcount *post)
3626{
3627 int ret;
3628 struct ocfs2_xattr_value_root *xv = vb->vb_xv;
3629 struct ocfs2_cow_context *context = NULL;
3630 u32 cow_start, cow_len;
3631
3632 BUG_ON(!ocfs2_is_refcount_inode(inode));
3633
3634 ret = ocfs2_refcount_cal_cow_clusters(inode, &xv->xr_list,
3635 cpos, write_len, UINT_MAX,
3636 &cow_start, &cow_len);
3637 if (ret) {
3638 mlog_errno(ret);
3639 goto out;
3640 }
3641
3642 BUG_ON(cow_len == 0);
3643
3644 context = kzalloc(sizeof(struct ocfs2_cow_context), GFP_NOFS);
3645 if (!context) {
3646 ret = -ENOMEM;
3647 mlog_errno(ret);
3648 goto out;
3649 }
3650
3651 context->inode = inode;
3652 context->cow_start = cow_start;
3653 context->cow_len = cow_len;
3654 context->ref_tree = ref_tree;
3655 context->ref_root_bh = ref_root_bh;
3656 context->cow_object = xv;
3657
3658 context->cow_duplicate_clusters = ocfs2_duplicate_clusters_by_jbd;
3659 /* We need the extra credits for duplicate_clusters by jbd. */
3660 context->extra_credits =
3661 ocfs2_clusters_to_blocks(inode->i_sb, 1) * cow_len;
3662 context->get_clusters = ocfs2_xattr_value_get_clusters;
3663 context->post_refcount = post;
3664
3665 ocfs2_init_xattr_value_extent_tree(&context->data_et,
3666 INODE_CACHE(inode), vb);
3667
3668 ret = ocfs2_replace_cow(context);
3669 if (ret)
3670 mlog_errno(ret);
3671
3672out:
3673 kfree(context);
3674 return ret;
3675}
3676
3677/*
3678 * Insert a new extent into refcount tree and mark a extent rec
3679 * as refcounted in the dinode tree.
3680 */
3681int ocfs2_add_refcount_flag(struct inode *inode,
3682 struct ocfs2_extent_tree *data_et,
3683 struct ocfs2_caching_info *ref_ci,
3684 struct buffer_head *ref_root_bh,
3685 u32 cpos, u32 p_cluster, u32 num_clusters,
3686 struct ocfs2_cached_dealloc_ctxt *dealloc,
3687 struct ocfs2_post_refcount *post)
3688{
3689 int ret;
3690 handle_t *handle;
3691 int credits = 1, ref_blocks = 0;
3692 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3693 struct ocfs2_alloc_context *meta_ac = NULL;
3694
3695 /* We need to be able to handle at least an extent tree split. */
3696 ref_blocks = ocfs2_extend_meta_needed(data_et->et_root_el);
3697
3698 ret = ocfs2_calc_refcount_meta_credits(inode->i_sb,
3699 ref_ci, ref_root_bh,
3700 p_cluster, num_clusters,
3701 &ref_blocks, &credits);
3702 if (ret) {
3703 mlog_errno(ret);
3704 goto out;
3705 }
3706
3707 trace_ocfs2_add_refcount_flag(ref_blocks, credits);
3708
3709 if (ref_blocks) {
3710 ret = ocfs2_reserve_new_metadata_blocks(OCFS2_SB(inode->i_sb),
3711 ref_blocks, &meta_ac);
3712 if (ret) {
3713 mlog_errno(ret);
3714 goto out;
3715 }
3716 }
3717
3718 if (post)
3719 credits += post->credits;
3720
3721 handle = ocfs2_start_trans(osb, credits);
3722 if (IS_ERR(handle)) {
3723 ret = PTR_ERR(handle);
3724 mlog_errno(ret);
3725 goto out;
3726 }
3727
3728 ret = ocfs2_mark_extent_refcounted(inode, data_et, handle,
3729 cpos, num_clusters, p_cluster,
3730 meta_ac, dealloc);
3731 if (ret) {
3732 mlog_errno(ret);
3733 goto out_commit;
3734 }
3735
3736 ret = __ocfs2_increase_refcount(handle, ref_ci, ref_root_bh,
3737 p_cluster, num_clusters, 0,
3738 meta_ac, dealloc);
3739 if (ret) {
3740 mlog_errno(ret);
3741 goto out_commit;
3742 }
3743
3744 if (post && post->func) {
3745 ret = post->func(inode, handle, post->para);
3746 if (ret)
3747 mlog_errno(ret);
3748 }
3749
3750out_commit:
3751 ocfs2_commit_trans(osb, handle);
3752out:
3753 if (meta_ac)
3754 ocfs2_free_alloc_context(meta_ac);
3755 return ret;
3756}
3757
3758static int ocfs2_change_ctime(struct inode *inode,
3759 struct buffer_head *di_bh)
3760{
3761 int ret;
3762 handle_t *handle;
3763 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
3764
3765 handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb),
3766 OCFS2_INODE_UPDATE_CREDITS);
3767 if (IS_ERR(handle)) {
3768 ret = PTR_ERR(handle);
3769 mlog_errno(ret);
3770 goto out;
3771 }
3772
3773 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
3774 OCFS2_JOURNAL_ACCESS_WRITE);
3775 if (ret) {
3776 mlog_errno(ret);
3777 goto out_commit;
3778 }
3779
3780 inode->i_ctime = current_time(inode);
3781 di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
3782 di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
3783
3784 ocfs2_journal_dirty(handle, di_bh);
3785
3786out_commit:
3787 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
3788out:
3789 return ret;
3790}
3791
3792static int ocfs2_attach_refcount_tree(struct inode *inode,
3793 struct buffer_head *di_bh)
3794{
3795 int ret, data_changed = 0;
3796 struct buffer_head *ref_root_bh = NULL;
3797 struct ocfs2_inode_info *oi = OCFS2_I(inode);
3798 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
3799 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3800 struct ocfs2_refcount_tree *ref_tree;
3801 unsigned int ext_flags;
3802 loff_t size;
3803 u32 cpos, num_clusters, clusters, p_cluster;
3804 struct ocfs2_cached_dealloc_ctxt dealloc;
3805 struct ocfs2_extent_tree di_et;
3806
3807 ocfs2_init_dealloc_ctxt(&dealloc);
3808
3809 if (!ocfs2_is_refcount_inode(inode)) {
3810 ret = ocfs2_create_refcount_tree(inode, di_bh);
3811 if (ret) {
3812 mlog_errno(ret);
3813 goto out;
3814 }
3815 }
3816
3817 BUG_ON(!di->i_refcount_loc);
3818 ret = ocfs2_lock_refcount_tree(osb,
3819 le64_to_cpu(di->i_refcount_loc), 1,
3820 &ref_tree, &ref_root_bh);
3821 if (ret) {
3822 mlog_errno(ret);
3823 goto out;
3824 }
3825
3826 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL)
3827 goto attach_xattr;
3828
3829 ocfs2_init_dinode_extent_tree(&di_et, INODE_CACHE(inode), di_bh);
3830
3831 size = i_size_read(inode);
3832 clusters = ocfs2_clusters_for_bytes(inode->i_sb, size);
3833
3834 cpos = 0;
3835 while (cpos < clusters) {
3836 ret = ocfs2_get_clusters(inode, cpos, &p_cluster,
3837 &num_clusters, &ext_flags);
3838 if (ret) {
3839 mlog_errno(ret);
3840 goto unlock;
3841 }
3842 if (p_cluster && !(ext_flags & OCFS2_EXT_REFCOUNTED)) {
3843 ret = ocfs2_add_refcount_flag(inode, &di_et,
3844 &ref_tree->rf_ci,
3845 ref_root_bh, cpos,
3846 p_cluster, num_clusters,
3847 &dealloc, NULL);
3848 if (ret) {
3849 mlog_errno(ret);
3850 goto unlock;
3851 }
3852
3853 data_changed = 1;
3854 }
3855 cpos += num_clusters;
3856 }
3857
3858attach_xattr:
3859 if (oi->ip_dyn_features & OCFS2_HAS_XATTR_FL) {
3860 ret = ocfs2_xattr_attach_refcount_tree(inode, di_bh,
3861 &ref_tree->rf_ci,
3862 ref_root_bh,
3863 &dealloc);
3864 if (ret) {
3865 mlog_errno(ret);
3866 goto unlock;
3867 }
3868 }
3869
3870 if (data_changed) {
3871 ret = ocfs2_change_ctime(inode, di_bh);
3872 if (ret)
3873 mlog_errno(ret);
3874 }
3875
3876unlock:
3877 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
3878 brelse(ref_root_bh);
3879
3880 if (!ret && ocfs2_dealloc_has_cluster(&dealloc)) {
3881 ocfs2_schedule_truncate_log_flush(osb, 1);
3882 ocfs2_run_deallocs(osb, &dealloc);
3883 }
3884out:
3885 /*
3886 * Empty the extent map so that we may get the right extent
3887 * record from the disk.
3888 */
3889 ocfs2_extent_map_trunc(inode, 0);
3890
3891 return ret;
3892}
3893
3894static int ocfs2_add_refcounted_extent(struct inode *inode,
3895 struct ocfs2_extent_tree *et,
3896 struct ocfs2_caching_info *ref_ci,
3897 struct buffer_head *ref_root_bh,
3898 u32 cpos, u32 p_cluster, u32 num_clusters,
3899 unsigned int ext_flags,
3900 struct ocfs2_cached_dealloc_ctxt *dealloc)
3901{
3902 int ret;
3903 handle_t *handle;
3904 int credits = 0;
3905 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3906 struct ocfs2_alloc_context *meta_ac = NULL;
3907
3908 ret = ocfs2_lock_refcount_allocators(inode->i_sb,
3909 p_cluster, num_clusters,
3910 et, ref_ci,
3911 ref_root_bh, &meta_ac,
3912 NULL, &credits);
3913 if (ret) {
3914 mlog_errno(ret);
3915 goto out;
3916 }
3917
3918 handle = ocfs2_start_trans(osb, credits);
3919 if (IS_ERR(handle)) {
3920 ret = PTR_ERR(handle);
3921 mlog_errno(ret);
3922 goto out;
3923 }
3924
3925 ret = ocfs2_insert_extent(handle, et, cpos,
3926 ocfs2_clusters_to_blocks(inode->i_sb, p_cluster),
3927 num_clusters, ext_flags, meta_ac);
3928 if (ret) {
3929 mlog_errno(ret);
3930 goto out_commit;
3931 }
3932
3933 ret = ocfs2_increase_refcount(handle, ref_ci, ref_root_bh,
3934 p_cluster, num_clusters,
3935 meta_ac, dealloc);
3936 if (ret) {
3937 mlog_errno(ret);
3938 goto out_commit;
3939 }
3940
3941 ret = dquot_alloc_space_nodirty(inode,
3942 ocfs2_clusters_to_bytes(osb->sb, num_clusters));
3943 if (ret)
3944 mlog_errno(ret);
3945
3946out_commit:
3947 ocfs2_commit_trans(osb, handle);
3948out:
3949 if (meta_ac)
3950 ocfs2_free_alloc_context(meta_ac);
3951 return ret;
3952}
3953
3954static int ocfs2_duplicate_inline_data(struct inode *s_inode,
3955 struct buffer_head *s_bh,
3956 struct inode *t_inode,
3957 struct buffer_head *t_bh)
3958{
3959 int ret;
3960 handle_t *handle;
3961 struct ocfs2_super *osb = OCFS2_SB(s_inode->i_sb);
3962 struct ocfs2_dinode *s_di = (struct ocfs2_dinode *)s_bh->b_data;
3963 struct ocfs2_dinode *t_di = (struct ocfs2_dinode *)t_bh->b_data;
3964
3965 BUG_ON(!(OCFS2_I(s_inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL));
3966
3967 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
3968 if (IS_ERR(handle)) {
3969 ret = PTR_ERR(handle);
3970 mlog_errno(ret);
3971 goto out;
3972 }
3973
3974 ret = ocfs2_journal_access_di(handle, INODE_CACHE(t_inode), t_bh,
3975 OCFS2_JOURNAL_ACCESS_WRITE);
3976 if (ret) {
3977 mlog_errno(ret);
3978 goto out_commit;
3979 }
3980
3981 t_di->id2.i_data.id_count = s_di->id2.i_data.id_count;
3982 memcpy(t_di->id2.i_data.id_data, s_di->id2.i_data.id_data,
3983 le16_to_cpu(s_di->id2.i_data.id_count));
3984 spin_lock(&OCFS2_I(t_inode)->ip_lock);
3985 OCFS2_I(t_inode)->ip_dyn_features |= OCFS2_INLINE_DATA_FL;
3986 t_di->i_dyn_features = cpu_to_le16(OCFS2_I(t_inode)->ip_dyn_features);
3987 spin_unlock(&OCFS2_I(t_inode)->ip_lock);
3988
3989 ocfs2_journal_dirty(handle, t_bh);
3990
3991out_commit:
3992 ocfs2_commit_trans(osb, handle);
3993out:
3994 return ret;
3995}
3996
3997static int ocfs2_duplicate_extent_list(struct inode *s_inode,
3998 struct inode *t_inode,
3999 struct buffer_head *t_bh,
4000 struct ocfs2_caching_info *ref_ci,
4001 struct buffer_head *ref_root_bh,
4002 struct ocfs2_cached_dealloc_ctxt *dealloc)
4003{
4004 int ret = 0;
4005 u32 p_cluster, num_clusters, clusters, cpos;
4006 loff_t size;
4007 unsigned int ext_flags;
4008 struct ocfs2_extent_tree et;
4009
4010 ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(t_inode), t_bh);
4011
4012 size = i_size_read(s_inode);
4013 clusters = ocfs2_clusters_for_bytes(s_inode->i_sb, size);
4014
4015 cpos = 0;
4016 while (cpos < clusters) {
4017 ret = ocfs2_get_clusters(s_inode, cpos, &p_cluster,
4018 &num_clusters, &ext_flags);
4019 if (ret) {
4020 mlog_errno(ret);
4021 goto out;
4022 }
4023 if (p_cluster) {
4024 ret = ocfs2_add_refcounted_extent(t_inode, &et,
4025 ref_ci, ref_root_bh,
4026 cpos, p_cluster,
4027 num_clusters,
4028 ext_flags,
4029 dealloc);
4030 if (ret) {
4031 mlog_errno(ret);
4032 goto out;
4033 }
4034 }
4035
4036 cpos += num_clusters;
4037 }
4038
4039out:
4040 return ret;
4041}
4042
4043/*
4044 * change the new file's attributes to the src.
4045 *
4046 * reflink creates a snapshot of a file, that means the attributes
4047 * must be identical except for three exceptions - nlink, ino, and ctime.
4048 */
4049static int ocfs2_complete_reflink(struct inode *s_inode,
4050 struct buffer_head *s_bh,
4051 struct inode *t_inode,
4052 struct buffer_head *t_bh,
4053 bool preserve)
4054{
4055 int ret;
4056 handle_t *handle;
4057 struct ocfs2_dinode *s_di = (struct ocfs2_dinode *)s_bh->b_data;
4058 struct ocfs2_dinode *di = (struct ocfs2_dinode *)t_bh->b_data;
4059 loff_t size = i_size_read(s_inode);
4060
4061 handle = ocfs2_start_trans(OCFS2_SB(t_inode->i_sb),
4062 OCFS2_INODE_UPDATE_CREDITS);
4063 if (IS_ERR(handle)) {
4064 ret = PTR_ERR(handle);
4065 mlog_errno(ret);
4066 return ret;
4067 }
4068
4069 ret = ocfs2_journal_access_di(handle, INODE_CACHE(t_inode), t_bh,
4070 OCFS2_JOURNAL_ACCESS_WRITE);
4071 if (ret) {
4072 mlog_errno(ret);
4073 goto out_commit;
4074 }
4075
4076 spin_lock(&OCFS2_I(t_inode)->ip_lock);
4077 OCFS2_I(t_inode)->ip_clusters = OCFS2_I(s_inode)->ip_clusters;
4078 OCFS2_I(t_inode)->ip_attr = OCFS2_I(s_inode)->ip_attr;
4079 OCFS2_I(t_inode)->ip_dyn_features = OCFS2_I(s_inode)->ip_dyn_features;
4080 spin_unlock(&OCFS2_I(t_inode)->ip_lock);
4081 i_size_write(t_inode, size);
4082 t_inode->i_blocks = s_inode->i_blocks;
4083
4084 di->i_xattr_inline_size = s_di->i_xattr_inline_size;
4085 di->i_clusters = s_di->i_clusters;
4086 di->i_size = s_di->i_size;
4087 di->i_dyn_features = s_di->i_dyn_features;
4088 di->i_attr = s_di->i_attr;
4089
4090 if (preserve) {
4091 t_inode->i_uid = s_inode->i_uid;
4092 t_inode->i_gid = s_inode->i_gid;
4093 t_inode->i_mode = s_inode->i_mode;
4094 di->i_uid = s_di->i_uid;
4095 di->i_gid = s_di->i_gid;
4096 di->i_mode = s_di->i_mode;
4097
4098 /*
4099 * update time.
4100 * we want mtime to appear identical to the source and
4101 * update ctime.
4102 */
4103 t_inode->i_ctime = current_time(t_inode);
4104
4105 di->i_ctime = cpu_to_le64(t_inode->i_ctime.tv_sec);
4106 di->i_ctime_nsec = cpu_to_le32(t_inode->i_ctime.tv_nsec);
4107
4108 t_inode->i_mtime = s_inode->i_mtime;
4109 di->i_mtime = s_di->i_mtime;
4110 di->i_mtime_nsec = s_di->i_mtime_nsec;
4111 }
4112
4113 ocfs2_journal_dirty(handle, t_bh);
4114
4115out_commit:
4116 ocfs2_commit_trans(OCFS2_SB(t_inode->i_sb), handle);
4117 return ret;
4118}
4119
4120static int ocfs2_create_reflink_node(struct inode *s_inode,
4121 struct buffer_head *s_bh,
4122 struct inode *t_inode,
4123 struct buffer_head *t_bh,
4124 bool preserve)
4125{
4126 int ret;
4127 struct buffer_head *ref_root_bh = NULL;
4128 struct ocfs2_cached_dealloc_ctxt dealloc;
4129 struct ocfs2_super *osb = OCFS2_SB(s_inode->i_sb);
4130 struct ocfs2_refcount_block *rb;
4131 struct ocfs2_dinode *di = (struct ocfs2_dinode *)s_bh->b_data;
4132 struct ocfs2_refcount_tree *ref_tree;
4133
4134 ocfs2_init_dealloc_ctxt(&dealloc);
4135
4136 ret = ocfs2_set_refcount_tree(t_inode, t_bh,
4137 le64_to_cpu(di->i_refcount_loc));
4138 if (ret) {
4139 mlog_errno(ret);
4140 goto out;
4141 }
4142
4143 if (OCFS2_I(s_inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
4144 ret = ocfs2_duplicate_inline_data(s_inode, s_bh,
4145 t_inode, t_bh);
4146 if (ret)
4147 mlog_errno(ret);
4148 goto out;
4149 }
4150
4151 ret = ocfs2_lock_refcount_tree(osb, le64_to_cpu(di->i_refcount_loc),
4152 1, &ref_tree, &ref_root_bh);
4153 if (ret) {
4154 mlog_errno(ret);
4155 goto out;
4156 }
4157 rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
4158
4159 ret = ocfs2_duplicate_extent_list(s_inode, t_inode, t_bh,
4160 &ref_tree->rf_ci, ref_root_bh,
4161 &dealloc);
4162 if (ret) {
4163 mlog_errno(ret);
4164 goto out_unlock_refcount;
4165 }
4166
4167out_unlock_refcount:
4168 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
4169 brelse(ref_root_bh);
4170out:
4171 if (ocfs2_dealloc_has_cluster(&dealloc)) {
4172 ocfs2_schedule_truncate_log_flush(osb, 1);
4173 ocfs2_run_deallocs(osb, &dealloc);
4174 }
4175
4176 return ret;
4177}
4178
4179static int __ocfs2_reflink(struct dentry *old_dentry,
4180 struct buffer_head *old_bh,
4181 struct inode *new_inode,
4182 bool preserve)
4183{
4184 int ret;
4185 struct inode *inode = d_inode(old_dentry);
4186 struct buffer_head *new_bh = NULL;
4187
4188 if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_SYSTEM_FILE) {
4189 ret = -EINVAL;
4190 mlog_errno(ret);
4191 goto out;
4192 }
4193
4194 ret = filemap_fdatawrite(inode->i_mapping);
4195 if (ret) {
4196 mlog_errno(ret);
4197 goto out;
4198 }
4199
4200 ret = ocfs2_attach_refcount_tree(inode, old_bh);
4201 if (ret) {
4202 mlog_errno(ret);
4203 goto out;
4204 }
4205
4206 inode_lock_nested(new_inode, I_MUTEX_CHILD);
4207 ret = ocfs2_inode_lock_nested(new_inode, &new_bh, 1,
4208 OI_LS_REFLINK_TARGET);
4209 if (ret) {
4210 mlog_errno(ret);
4211 goto out_unlock;
4212 }
4213
4214 ret = ocfs2_create_reflink_node(inode, old_bh,
4215 new_inode, new_bh, preserve);
4216 if (ret) {
4217 mlog_errno(ret);
4218 goto inode_unlock;
4219 }
4220
4221 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_XATTR_FL) {
4222 ret = ocfs2_reflink_xattrs(inode, old_bh,
4223 new_inode, new_bh,
4224 preserve);
4225 if (ret) {
4226 mlog_errno(ret);
4227 goto inode_unlock;
4228 }
4229 }
4230
4231 ret = ocfs2_complete_reflink(inode, old_bh,
4232 new_inode, new_bh, preserve);
4233 if (ret)
4234 mlog_errno(ret);
4235
4236inode_unlock:
4237 ocfs2_inode_unlock(new_inode, 1);
4238 brelse(new_bh);
4239out_unlock:
4240 inode_unlock(new_inode);
4241out:
4242 if (!ret) {
4243 ret = filemap_fdatawait(inode->i_mapping);
4244 if (ret)
4245 mlog_errno(ret);
4246 }
4247 return ret;
4248}
4249
4250static int ocfs2_reflink(struct dentry *old_dentry, struct inode *dir,
4251 struct dentry *new_dentry, bool preserve)
4252{
4253 int error;
4254 struct inode *inode = d_inode(old_dentry);
4255 struct buffer_head *old_bh = NULL;
4256 struct inode *new_orphan_inode = NULL;
4257
4258 if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb)))
4259 return -EOPNOTSUPP;
4260
4261
4262 error = ocfs2_create_inode_in_orphan(dir, inode->i_mode,
4263 &new_orphan_inode);
4264 if (error) {
4265 mlog_errno(error);
4266 goto out;
4267 }
4268
4269 error = ocfs2_rw_lock(inode, 1);
4270 if (error) {
4271 mlog_errno(error);
4272 goto out;
4273 }
4274
4275 error = ocfs2_inode_lock(inode, &old_bh, 1);
4276 if (error) {
4277 mlog_errno(error);
4278 ocfs2_rw_unlock(inode, 1);
4279 goto out;
4280 }
4281
4282 down_write(&OCFS2_I(inode)->ip_xattr_sem);
4283 down_write(&OCFS2_I(inode)->ip_alloc_sem);
4284 error = __ocfs2_reflink(old_dentry, old_bh,
4285 new_orphan_inode, preserve);
4286 up_write(&OCFS2_I(inode)->ip_alloc_sem);
4287 up_write(&OCFS2_I(inode)->ip_xattr_sem);
4288
4289 ocfs2_inode_unlock(inode, 1);
4290 ocfs2_rw_unlock(inode, 1);
4291 brelse(old_bh);
4292
4293 if (error) {
4294 mlog_errno(error);
4295 goto out;
4296 }
4297
4298 /* If the security isn't preserved, we need to re-initialize them. */
4299 if (!preserve) {
4300 error = ocfs2_init_security_and_acl(dir, new_orphan_inode,
4301 &new_dentry->d_name);
4302 if (error)
4303 mlog_errno(error);
4304 }
4305out:
4306 if (!error) {
4307 error = ocfs2_mv_orphaned_inode_to_new(dir, new_orphan_inode,
4308 new_dentry);
4309 if (error)
4310 mlog_errno(error);
4311 }
4312
4313 if (new_orphan_inode) {
4314 /*
4315 * We need to open_unlock the inode no matter whether we
4316 * succeed or not, so that other nodes can delete it later.
4317 */
4318 ocfs2_open_unlock(new_orphan_inode);
4319 if (error)
4320 iput(new_orphan_inode);
4321 }
4322
4323 return error;
4324}
4325
4326/*
4327 * Below here are the bits used by OCFS2_IOC_REFLINK() to fake
4328 * sys_reflink(). This will go away when vfs_reflink() exists in
4329 * fs/namei.c.
4330 */
4331
4332/* copied from may_create in VFS. */
4333static inline int ocfs2_may_create(struct inode *dir, struct dentry *child)
4334{
4335 if (d_really_is_positive(child))
4336 return -EEXIST;
4337 if (IS_DEADDIR(dir))
4338 return -ENOENT;
4339 return inode_permission(dir, MAY_WRITE | MAY_EXEC);
4340}
4341
4342/**
4343 * ocfs2_vfs_reflink - Create a reference-counted link
4344 *
4345 * @old_dentry: source dentry + inode
4346 * @dir: directory to create the target
4347 * @new_dentry: target dentry
4348 * @preserve: if true, preserve all file attributes
4349 */
4350static int ocfs2_vfs_reflink(struct dentry *old_dentry, struct inode *dir,
4351 struct dentry *new_dentry, bool preserve)
4352{
4353 struct inode *inode = d_inode(old_dentry);
4354 int error;
4355
4356 if (!inode)
4357 return -ENOENT;
4358
4359 error = ocfs2_may_create(dir, new_dentry);
4360 if (error)
4361 return error;
4362
4363 if (dir->i_sb != inode->i_sb)
4364 return -EXDEV;
4365
4366 /*
4367 * A reflink to an append-only or immutable file cannot be created.
4368 */
4369 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
4370 return -EPERM;
4371
4372 /* Only regular files can be reflinked. */
4373 if (!S_ISREG(inode->i_mode))
4374 return -EPERM;
4375
4376 /*
4377 * If the caller wants to preserve ownership, they require the
4378 * rights to do so.
4379 */
4380 if (preserve) {
4381 if (!uid_eq(current_fsuid(), inode->i_uid) && !capable(CAP_CHOWN))
4382 return -EPERM;
4383 if (!in_group_p(inode->i_gid) && !capable(CAP_CHOWN))
4384 return -EPERM;
4385 }
4386
4387 /*
4388 * If the caller is modifying any aspect of the attributes, they
4389 * are not creating a snapshot. They need read permission on the
4390 * file.
4391 */
4392 if (!preserve) {
4393 error = inode_permission(inode, MAY_READ);
4394 if (error)
4395 return error;
4396 }
4397
4398 inode_lock(inode);
4399 error = dquot_initialize(dir);
4400 if (!error)
4401 error = ocfs2_reflink(old_dentry, dir, new_dentry, preserve);
4402 inode_unlock(inode);
4403 if (!error)
4404 fsnotify_create(dir, new_dentry);
4405 return error;
4406}
4407/*
4408 * Most codes are copied from sys_linkat.
4409 */
4410int ocfs2_reflink_ioctl(struct inode *inode,
4411 const char __user *oldname,
4412 const char __user *newname,
4413 bool preserve)
4414{
4415 struct dentry *new_dentry;
4416 struct path old_path, new_path;
4417 int error;
4418
4419 if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb)))
4420 return -EOPNOTSUPP;
4421
4422 error = user_path_at(AT_FDCWD, oldname, 0, &old_path);
4423 if (error) {
4424 mlog_errno(error);
4425 return error;
4426 }
4427
4428 new_dentry = user_path_create(AT_FDCWD, newname, &new_path, 0);
4429 error = PTR_ERR(new_dentry);
4430 if (IS_ERR(new_dentry)) {
4431 mlog_errno(error);
4432 goto out;
4433 }
4434
4435 error = -EXDEV;
4436 if (old_path.mnt != new_path.mnt) {
4437 mlog_errno(error);
4438 goto out_dput;
4439 }
4440
4441 error = ocfs2_vfs_reflink(old_path.dentry,
4442 d_inode(new_path.dentry),
4443 new_dentry, preserve);
4444out_dput:
4445 done_path_create(&new_path, new_dentry);
4446out:
4447 path_put(&old_path);
4448
4449 return error;
4450}
4451
4452/* Update destination inode size, if necessary. */
4453static int ocfs2_reflink_update_dest(struct inode *dest,
4454 struct buffer_head *d_bh,
4455 loff_t newlen)
4456{
4457 handle_t *handle;
4458 int ret;
4459
4460 dest->i_blocks = ocfs2_inode_sector_count(dest);
4461
4462 if (newlen <= i_size_read(dest))
4463 return 0;
4464
4465 handle = ocfs2_start_trans(OCFS2_SB(dest->i_sb),
4466 OCFS2_INODE_UPDATE_CREDITS);
4467 if (IS_ERR(handle)) {
4468 ret = PTR_ERR(handle);
4469 mlog_errno(ret);
4470 return ret;
4471 }
4472
4473 /* Extend i_size if needed. */
4474 spin_lock(&OCFS2_I(dest)->ip_lock);
4475 if (newlen > i_size_read(dest))
4476 i_size_write(dest, newlen);
4477 spin_unlock(&OCFS2_I(dest)->ip_lock);
4478 dest->i_ctime = dest->i_mtime = current_time(dest);
4479
4480 ret = ocfs2_mark_inode_dirty(handle, dest, d_bh);
4481 if (ret) {
4482 mlog_errno(ret);
4483 goto out_commit;
4484 }
4485
4486out_commit:
4487 ocfs2_commit_trans(OCFS2_SB(dest->i_sb), handle);
4488 return ret;
4489}
4490
4491/* Remap the range pos_in:len in s_inode to pos_out:len in t_inode. */
4492static int ocfs2_reflink_remap_extent(struct inode *s_inode,
4493 struct buffer_head *s_bh,
4494 loff_t pos_in,
4495 struct inode *t_inode,
4496 struct buffer_head *t_bh,
4497 loff_t pos_out,
4498 loff_t len,
4499 struct ocfs2_cached_dealloc_ctxt *dealloc)
4500{
4501 struct ocfs2_extent_tree s_et;
4502 struct ocfs2_extent_tree t_et;
4503 struct ocfs2_dinode *dis;
4504 struct buffer_head *ref_root_bh = NULL;
4505 struct ocfs2_refcount_tree *ref_tree;
4506 struct ocfs2_super *osb;
4507 loff_t pstart, plen;
4508 u32 p_cluster, num_clusters, slast, spos, tpos;
4509 unsigned int ext_flags;
4510 int ret = 0;
4511
4512 osb = OCFS2_SB(s_inode->i_sb);
4513 dis = (struct ocfs2_dinode *)s_bh->b_data;
4514 ocfs2_init_dinode_extent_tree(&s_et, INODE_CACHE(s_inode), s_bh);
4515 ocfs2_init_dinode_extent_tree(&t_et, INODE_CACHE(t_inode), t_bh);
4516
4517 spos = ocfs2_bytes_to_clusters(s_inode->i_sb, pos_in);
4518 tpos = ocfs2_bytes_to_clusters(t_inode->i_sb, pos_out);
4519 slast = ocfs2_clusters_for_bytes(s_inode->i_sb, pos_in + len);
4520
4521 while (spos < slast) {
4522 if (fatal_signal_pending(current)) {
4523 ret = -EINTR;
4524 goto out;
4525 }
4526
4527 /* Look up the extent. */
4528 ret = ocfs2_get_clusters(s_inode, spos, &p_cluster,
4529 &num_clusters, &ext_flags);
4530 if (ret) {
4531 mlog_errno(ret);
4532 goto out;
4533 }
4534
4535 num_clusters = min_t(u32, num_clusters, slast - spos);
4536
4537 /* Punch out the dest range. */
4538 pstart = ocfs2_clusters_to_bytes(t_inode->i_sb, tpos);
4539 plen = ocfs2_clusters_to_bytes(t_inode->i_sb, num_clusters);
4540 ret = ocfs2_remove_inode_range(t_inode, t_bh, pstart, plen);
4541 if (ret) {
4542 mlog_errno(ret);
4543 goto out;
4544 }
4545
4546 if (p_cluster == 0)
4547 goto next_loop;
4548
4549 /* Lock the refcount btree... */
4550 ret = ocfs2_lock_refcount_tree(osb,
4551 le64_to_cpu(dis->i_refcount_loc),
4552 1, &ref_tree, &ref_root_bh);
4553 if (ret) {
4554 mlog_errno(ret);
4555 goto out;
4556 }
4557
4558 /* Mark s_inode's extent as refcounted. */
4559 if (!(ext_flags & OCFS2_EXT_REFCOUNTED)) {
4560 ret = ocfs2_add_refcount_flag(s_inode, &s_et,
4561 &ref_tree->rf_ci,
4562 ref_root_bh, spos,
4563 p_cluster, num_clusters,
4564 dealloc, NULL);
4565 if (ret) {
4566 mlog_errno(ret);
4567 goto out_unlock_refcount;
4568 }
4569 }
4570
4571 /* Map in the new extent. */
4572 ext_flags |= OCFS2_EXT_REFCOUNTED;
4573 ret = ocfs2_add_refcounted_extent(t_inode, &t_et,
4574 &ref_tree->rf_ci,
4575 ref_root_bh,
4576 tpos, p_cluster,
4577 num_clusters,
4578 ext_flags,
4579 dealloc);
4580 if (ret) {
4581 mlog_errno(ret);
4582 goto out_unlock_refcount;
4583 }
4584
4585 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
4586 brelse(ref_root_bh);
4587next_loop:
4588 spos += num_clusters;
4589 tpos += num_clusters;
4590 }
4591
4592out:
4593 return ret;
4594out_unlock_refcount:
4595 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
4596 brelse(ref_root_bh);
4597 return ret;
4598}
4599
4600/* Set up refcount tree and remap s_inode to t_inode. */
4601static int ocfs2_reflink_remap_blocks(struct inode *s_inode,
4602 struct buffer_head *s_bh,
4603 loff_t pos_in,
4604 struct inode *t_inode,
4605 struct buffer_head *t_bh,
4606 loff_t pos_out,
4607 loff_t len)
4608{
4609 struct ocfs2_cached_dealloc_ctxt dealloc;
4610 struct ocfs2_super *osb;
4611 struct ocfs2_dinode *dis;
4612 struct ocfs2_dinode *dit;
4613 int ret;
4614
4615 osb = OCFS2_SB(s_inode->i_sb);
4616 dis = (struct ocfs2_dinode *)s_bh->b_data;
4617 dit = (struct ocfs2_dinode *)t_bh->b_data;
4618 ocfs2_init_dealloc_ctxt(&dealloc);
4619
4620 /*
4621 * If we're reflinking the entire file and the source is inline
4622 * data, just copy the contents.
4623 */
4624 if (pos_in == pos_out && pos_in == 0 && len == i_size_read(s_inode) &&
4625 i_size_read(t_inode) <= len &&
4626 (OCFS2_I(s_inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)) {
4627 ret = ocfs2_duplicate_inline_data(s_inode, s_bh, t_inode, t_bh);
4628 if (ret)
4629 mlog_errno(ret);
4630 goto out;
4631 }
4632
4633 /*
4634 * If both inodes belong to two different refcount groups then
4635 * forget it because we don't know how (or want) to go merging
4636 * refcount trees.
4637 */
4638 ret = -EOPNOTSUPP;
4639 if (ocfs2_is_refcount_inode(s_inode) &&
4640 ocfs2_is_refcount_inode(t_inode) &&
4641 le64_to_cpu(dis->i_refcount_loc) !=
4642 le64_to_cpu(dit->i_refcount_loc))
4643 goto out;
4644
4645 /* Neither inode has a refcount tree. Add one to s_inode. */
4646 if (!ocfs2_is_refcount_inode(s_inode) &&
4647 !ocfs2_is_refcount_inode(t_inode)) {
4648 ret = ocfs2_create_refcount_tree(s_inode, s_bh);
4649 if (ret) {
4650 mlog_errno(ret);
4651 goto out;
4652 }
4653 }
4654
4655 /* Ensure that both inodes end up with the same refcount tree. */
4656 if (!ocfs2_is_refcount_inode(s_inode)) {
4657 ret = ocfs2_set_refcount_tree(s_inode, s_bh,
4658 le64_to_cpu(dit->i_refcount_loc));
4659 if (ret) {
4660 mlog_errno(ret);
4661 goto out;
4662 }
4663 }
4664 if (!ocfs2_is_refcount_inode(t_inode)) {
4665 ret = ocfs2_set_refcount_tree(t_inode, t_bh,
4666 le64_to_cpu(dis->i_refcount_loc));
4667 if (ret) {
4668 mlog_errno(ret);
4669 goto out;
4670 }
4671 }
4672
4673 /* Turn off inline data in the dest file. */
4674 if (OCFS2_I(t_inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
4675 ret = ocfs2_convert_inline_data_to_extents(t_inode, t_bh);
4676 if (ret) {
4677 mlog_errno(ret);
4678 goto out;
4679 }
4680 }
4681
4682 /* Actually remap extents now. */
4683 ret = ocfs2_reflink_remap_extent(s_inode, s_bh, pos_in, t_inode, t_bh,
4684 pos_out, len, &dealloc);
4685 if (ret) {
4686 mlog_errno(ret);
4687 goto out;
4688 }
4689
4690out:
4691 if (ocfs2_dealloc_has_cluster(&dealloc)) {
4692 ocfs2_schedule_truncate_log_flush(osb, 1);
4693 ocfs2_run_deallocs(osb, &dealloc);
4694 }
4695
4696 return ret;
4697}
4698
4699/* Lock an inode and grab a bh pointing to the inode. */
4700static int ocfs2_reflink_inodes_lock(struct inode *s_inode,
4701 struct buffer_head **bh1,
4702 struct inode *t_inode,
4703 struct buffer_head **bh2)
4704{
4705 struct inode *inode1;
4706 struct inode *inode2;
4707 struct ocfs2_inode_info *oi1;
4708 struct ocfs2_inode_info *oi2;
4709 bool same_inode = (s_inode == t_inode);
4710 int status;
4711
4712 /* First grab the VFS and rw locks. */
4713 lock_two_nondirectories(s_inode, t_inode);
4714 inode1 = s_inode;
4715 inode2 = t_inode;
4716 if (inode1->i_ino > inode2->i_ino)
4717 swap(inode1, inode2);
4718
4719 status = ocfs2_rw_lock(inode1, 1);
4720 if (status) {
4721 mlog_errno(status);
4722 goto out_i1;
4723 }
4724 if (!same_inode) {
4725 status = ocfs2_rw_lock(inode2, 1);
4726 if (status) {
4727 mlog_errno(status);
4728 goto out_i2;
4729 }
4730 }
4731
4732 /* Now go for the cluster locks */
4733 oi1 = OCFS2_I(inode1);
4734 oi2 = OCFS2_I(inode2);
4735
4736 trace_ocfs2_double_lock((unsigned long long)oi1->ip_blkno,
4737 (unsigned long long)oi2->ip_blkno);
4738
4739 if (*bh1)
4740 *bh1 = NULL;
4741 if (*bh2)
4742 *bh2 = NULL;
4743
4744 /* We always want to lock the one with the lower lockid first. */
4745 if (oi1->ip_blkno > oi2->ip_blkno)
4746 mlog_errno(-ENOLCK);
4747
4748 /* lock id1 */
4749 status = ocfs2_inode_lock_nested(inode1, bh1, 1, OI_LS_REFLINK_TARGET);
4750 if (status < 0) {
4751 if (status != -ENOENT)
4752 mlog_errno(status);
4753 goto out_rw2;
4754 }
4755
4756 /* lock id2 */
4757 if (!same_inode) {
4758 status = ocfs2_inode_lock_nested(inode2, bh2, 1,
4759 OI_LS_REFLINK_TARGET);
4760 if (status < 0) {
4761 if (status != -ENOENT)
4762 mlog_errno(status);
4763 goto out_cl1;
4764 }
4765 } else
4766 *bh2 = *bh1;
4767
4768 trace_ocfs2_double_lock_end(
4769 (unsigned long long)OCFS2_I(inode1)->ip_blkno,
4770 (unsigned long long)OCFS2_I(inode2)->ip_blkno);
4771
4772 return 0;
4773
4774out_cl1:
4775 ocfs2_inode_unlock(inode1, 1);
4776 brelse(*bh1);
4777 *bh1 = NULL;
4778out_rw2:
4779 ocfs2_rw_unlock(inode2, 1);
4780out_i2:
4781 ocfs2_rw_unlock(inode1, 1);
4782out_i1:
4783 unlock_two_nondirectories(s_inode, t_inode);
4784 return status;
4785}
4786
4787/* Unlock both inodes and release buffers. */
4788static void ocfs2_reflink_inodes_unlock(struct inode *s_inode,
4789 struct buffer_head *s_bh,
4790 struct inode *t_inode,
4791 struct buffer_head *t_bh)
4792{
4793 ocfs2_inode_unlock(s_inode, 1);
4794 ocfs2_rw_unlock(s_inode, 1);
4795 brelse(s_bh);
4796 if (s_inode != t_inode) {
4797 ocfs2_inode_unlock(t_inode, 1);
4798 ocfs2_rw_unlock(t_inode, 1);
4799 brelse(t_bh);
4800 }
4801 unlock_two_nondirectories(s_inode, t_inode);
4802}
4803
4804/* Link a range of blocks from one file to another. */
4805int ocfs2_reflink_remap_range(struct file *file_in,
4806 loff_t pos_in,
4807 struct file *file_out,
4808 loff_t pos_out,
4809 u64 len,
4810 bool is_dedupe)
4811{
4812 struct inode *inode_in = file_inode(file_in);
4813 struct inode *inode_out = file_inode(file_out);
4814 struct ocfs2_super *osb = OCFS2_SB(inode_in->i_sb);
4815 struct buffer_head *in_bh = NULL, *out_bh = NULL;
4816 bool same_inode = (inode_in == inode_out);
4817 ssize_t ret;
4818
4819 if (!ocfs2_refcount_tree(osb))
4820 return -EOPNOTSUPP;
4821 if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
4822 return -EROFS;
4823
4824 /* Lock both files against IO */
4825 ret = ocfs2_reflink_inodes_lock(inode_in, &in_bh, inode_out, &out_bh);
4826 if (ret)
4827 return ret;
4828
4829 /* Check file eligibility and prepare for block sharing. */
4830 ret = -EINVAL;
4831 if ((OCFS2_I(inode_in)->ip_flags & OCFS2_INODE_SYSTEM_FILE) ||
4832 (OCFS2_I(inode_out)->ip_flags & OCFS2_INODE_SYSTEM_FILE))
4833 goto out_unlock;
4834
4835 ret = vfs_clone_file_prep_inodes(inode_in, pos_in, inode_out, pos_out,
4836 &len, is_dedupe);
4837 if (ret <= 0)
4838 goto out_unlock;
4839
4840 /* Lock out changes to the allocation maps and remap. */
4841 down_write(&OCFS2_I(inode_in)->ip_alloc_sem);
4842 if (!same_inode)
4843 down_write_nested(&OCFS2_I(inode_out)->ip_alloc_sem,
4844 SINGLE_DEPTH_NESTING);
4845
4846 ret = ocfs2_reflink_remap_blocks(inode_in, in_bh, pos_in, inode_out,
4847 out_bh, pos_out, len);
4848
4849 /* Zap any page cache for the destination file's range. */
4850 if (!ret)
4851 truncate_inode_pages_range(&inode_out->i_data, pos_out,
4852 PAGE_ALIGN(pos_out + len) - 1);
4853
4854 up_write(&OCFS2_I(inode_in)->ip_alloc_sem);
4855 if (!same_inode)
4856 up_write(&OCFS2_I(inode_out)->ip_alloc_sem);
4857 if (ret) {
4858 mlog_errno(ret);
4859 goto out_unlock;
4860 }
4861
4862 /*
4863 * Empty the extent map so that we may get the right extent
4864 * record from the disk.
4865 */
4866 ocfs2_extent_map_trunc(inode_in, 0);
4867 ocfs2_extent_map_trunc(inode_out, 0);
4868
4869 ret = ocfs2_reflink_update_dest(inode_out, out_bh, pos_out + len);
4870 if (ret) {
4871 mlog_errno(ret);
4872 goto out_unlock;
4873 }
4874
4875 ocfs2_reflink_inodes_unlock(inode_in, in_bh, inode_out, out_bh);
4876 return 0;
4877
4878out_unlock:
4879 ocfs2_reflink_inodes_unlock(inode_in, in_bh, inode_out, out_bh);
4880 return ret;
4881}
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * refcounttree.c
4 *
5 * Copyright (C) 2009 Oracle. All rights reserved.
6 */
7
8#include <linux/sort.h>
9#include <cluster/masklog.h>
10#include "ocfs2.h"
11#include "inode.h"
12#include "alloc.h"
13#include "suballoc.h"
14#include "journal.h"
15#include "uptodate.h"
16#include "super.h"
17#include "buffer_head_io.h"
18#include "blockcheck.h"
19#include "refcounttree.h"
20#include "sysfile.h"
21#include "dlmglue.h"
22#include "extent_map.h"
23#include "aops.h"
24#include "xattr.h"
25#include "namei.h"
26#include "ocfs2_trace.h"
27#include "file.h"
28
29#include <linux/bio.h>
30#include <linux/blkdev.h>
31#include <linux/slab.h>
32#include <linux/writeback.h>
33#include <linux/pagevec.h>
34#include <linux/swap.h>
35#include <linux/security.h>
36#include <linux/fsnotify.h>
37#include <linux/quotaops.h>
38#include <linux/namei.h>
39#include <linux/mount.h>
40#include <linux/posix_acl.h>
41
42struct ocfs2_cow_context {
43 struct inode *inode;
44 u32 cow_start;
45 u32 cow_len;
46 struct ocfs2_extent_tree data_et;
47 struct ocfs2_refcount_tree *ref_tree;
48 struct buffer_head *ref_root_bh;
49 struct ocfs2_alloc_context *meta_ac;
50 struct ocfs2_alloc_context *data_ac;
51 struct ocfs2_cached_dealloc_ctxt dealloc;
52 void *cow_object;
53 struct ocfs2_post_refcount *post_refcount;
54 int extra_credits;
55 int (*get_clusters)(struct ocfs2_cow_context *context,
56 u32 v_cluster, u32 *p_cluster,
57 u32 *num_clusters,
58 unsigned int *extent_flags);
59 int (*cow_duplicate_clusters)(handle_t *handle,
60 struct inode *inode,
61 u32 cpos, u32 old_cluster,
62 u32 new_cluster, u32 new_len);
63};
64
65static inline struct ocfs2_refcount_tree *
66cache_info_to_refcount(struct ocfs2_caching_info *ci)
67{
68 return container_of(ci, struct ocfs2_refcount_tree, rf_ci);
69}
70
71static int ocfs2_validate_refcount_block(struct super_block *sb,
72 struct buffer_head *bh)
73{
74 int rc;
75 struct ocfs2_refcount_block *rb =
76 (struct ocfs2_refcount_block *)bh->b_data;
77
78 trace_ocfs2_validate_refcount_block((unsigned long long)bh->b_blocknr);
79
80 BUG_ON(!buffer_uptodate(bh));
81
82 /*
83 * If the ecc fails, we return the error but otherwise
84 * leave the filesystem running. We know any error is
85 * local to this block.
86 */
87 rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &rb->rf_check);
88 if (rc) {
89 mlog(ML_ERROR, "Checksum failed for refcount block %llu\n",
90 (unsigned long long)bh->b_blocknr);
91 return rc;
92 }
93
94
95 if (!OCFS2_IS_VALID_REFCOUNT_BLOCK(rb)) {
96 rc = ocfs2_error(sb,
97 "Refcount block #%llu has bad signature %.*s\n",
98 (unsigned long long)bh->b_blocknr, 7,
99 rb->rf_signature);
100 goto out;
101 }
102
103 if (le64_to_cpu(rb->rf_blkno) != bh->b_blocknr) {
104 rc = ocfs2_error(sb,
105 "Refcount block #%llu has an invalid rf_blkno of %llu\n",
106 (unsigned long long)bh->b_blocknr,
107 (unsigned long long)le64_to_cpu(rb->rf_blkno));
108 goto out;
109 }
110
111 if (le32_to_cpu(rb->rf_fs_generation) != OCFS2_SB(sb)->fs_generation) {
112 rc = ocfs2_error(sb,
113 "Refcount block #%llu has an invalid rf_fs_generation of #%u\n",
114 (unsigned long long)bh->b_blocknr,
115 le32_to_cpu(rb->rf_fs_generation));
116 goto out;
117 }
118out:
119 return rc;
120}
121
122static int ocfs2_read_refcount_block(struct ocfs2_caching_info *ci,
123 u64 rb_blkno,
124 struct buffer_head **bh)
125{
126 int rc;
127 struct buffer_head *tmp = *bh;
128
129 rc = ocfs2_read_block(ci, rb_blkno, &tmp,
130 ocfs2_validate_refcount_block);
131
132 /* If ocfs2_read_block() got us a new bh, pass it up. */
133 if (!rc && !*bh)
134 *bh = tmp;
135
136 return rc;
137}
138
139static u64 ocfs2_refcount_cache_owner(struct ocfs2_caching_info *ci)
140{
141 struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci);
142
143 return rf->rf_blkno;
144}
145
146static struct super_block *
147ocfs2_refcount_cache_get_super(struct ocfs2_caching_info *ci)
148{
149 struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci);
150
151 return rf->rf_sb;
152}
153
154static void ocfs2_refcount_cache_lock(struct ocfs2_caching_info *ci)
155__acquires(&rf->rf_lock)
156{
157 struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci);
158
159 spin_lock(&rf->rf_lock);
160}
161
162static void ocfs2_refcount_cache_unlock(struct ocfs2_caching_info *ci)
163__releases(&rf->rf_lock)
164{
165 struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci);
166
167 spin_unlock(&rf->rf_lock);
168}
169
170static void ocfs2_refcount_cache_io_lock(struct ocfs2_caching_info *ci)
171{
172 struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci);
173
174 mutex_lock(&rf->rf_io_mutex);
175}
176
177static void ocfs2_refcount_cache_io_unlock(struct ocfs2_caching_info *ci)
178{
179 struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci);
180
181 mutex_unlock(&rf->rf_io_mutex);
182}
183
184static const struct ocfs2_caching_operations ocfs2_refcount_caching_ops = {
185 .co_owner = ocfs2_refcount_cache_owner,
186 .co_get_super = ocfs2_refcount_cache_get_super,
187 .co_cache_lock = ocfs2_refcount_cache_lock,
188 .co_cache_unlock = ocfs2_refcount_cache_unlock,
189 .co_io_lock = ocfs2_refcount_cache_io_lock,
190 .co_io_unlock = ocfs2_refcount_cache_io_unlock,
191};
192
193static struct ocfs2_refcount_tree *
194ocfs2_find_refcount_tree(struct ocfs2_super *osb, u64 blkno)
195{
196 struct rb_node *n = osb->osb_rf_lock_tree.rb_node;
197 struct ocfs2_refcount_tree *tree = NULL;
198
199 while (n) {
200 tree = rb_entry(n, struct ocfs2_refcount_tree, rf_node);
201
202 if (blkno < tree->rf_blkno)
203 n = n->rb_left;
204 else if (blkno > tree->rf_blkno)
205 n = n->rb_right;
206 else
207 return tree;
208 }
209
210 return NULL;
211}
212
213/* osb_lock is already locked. */
214static void ocfs2_insert_refcount_tree(struct ocfs2_super *osb,
215 struct ocfs2_refcount_tree *new)
216{
217 u64 rf_blkno = new->rf_blkno;
218 struct rb_node *parent = NULL;
219 struct rb_node **p = &osb->osb_rf_lock_tree.rb_node;
220 struct ocfs2_refcount_tree *tmp;
221
222 while (*p) {
223 parent = *p;
224
225 tmp = rb_entry(parent, struct ocfs2_refcount_tree,
226 rf_node);
227
228 if (rf_blkno < tmp->rf_blkno)
229 p = &(*p)->rb_left;
230 else if (rf_blkno > tmp->rf_blkno)
231 p = &(*p)->rb_right;
232 else {
233 /* This should never happen! */
234 mlog(ML_ERROR, "Duplicate refcount block %llu found!\n",
235 (unsigned long long)rf_blkno);
236 BUG();
237 }
238 }
239
240 rb_link_node(&new->rf_node, parent, p);
241 rb_insert_color(&new->rf_node, &osb->osb_rf_lock_tree);
242}
243
244static void ocfs2_free_refcount_tree(struct ocfs2_refcount_tree *tree)
245{
246 ocfs2_metadata_cache_exit(&tree->rf_ci);
247 ocfs2_simple_drop_lockres(OCFS2_SB(tree->rf_sb), &tree->rf_lockres);
248 ocfs2_lock_res_free(&tree->rf_lockres);
249 kfree(tree);
250}
251
252static inline void
253ocfs2_erase_refcount_tree_from_list_no_lock(struct ocfs2_super *osb,
254 struct ocfs2_refcount_tree *tree)
255{
256 rb_erase(&tree->rf_node, &osb->osb_rf_lock_tree);
257 if (osb->osb_ref_tree_lru && osb->osb_ref_tree_lru == tree)
258 osb->osb_ref_tree_lru = NULL;
259}
260
261static void ocfs2_erase_refcount_tree_from_list(struct ocfs2_super *osb,
262 struct ocfs2_refcount_tree *tree)
263{
264 spin_lock(&osb->osb_lock);
265 ocfs2_erase_refcount_tree_from_list_no_lock(osb, tree);
266 spin_unlock(&osb->osb_lock);
267}
268
269static void ocfs2_kref_remove_refcount_tree(struct kref *kref)
270{
271 struct ocfs2_refcount_tree *tree =
272 container_of(kref, struct ocfs2_refcount_tree, rf_getcnt);
273
274 ocfs2_free_refcount_tree(tree);
275}
276
277static inline void
278ocfs2_refcount_tree_get(struct ocfs2_refcount_tree *tree)
279{
280 kref_get(&tree->rf_getcnt);
281}
282
283static inline void
284ocfs2_refcount_tree_put(struct ocfs2_refcount_tree *tree)
285{
286 kref_put(&tree->rf_getcnt, ocfs2_kref_remove_refcount_tree);
287}
288
289static inline void ocfs2_init_refcount_tree_ci(struct ocfs2_refcount_tree *new,
290 struct super_block *sb)
291{
292 ocfs2_metadata_cache_init(&new->rf_ci, &ocfs2_refcount_caching_ops);
293 mutex_init(&new->rf_io_mutex);
294 new->rf_sb = sb;
295 spin_lock_init(&new->rf_lock);
296}
297
298static inline void ocfs2_init_refcount_tree_lock(struct ocfs2_super *osb,
299 struct ocfs2_refcount_tree *new,
300 u64 rf_blkno, u32 generation)
301{
302 init_rwsem(&new->rf_sem);
303 ocfs2_refcount_lock_res_init(&new->rf_lockres, osb,
304 rf_blkno, generation);
305}
306
307static struct ocfs2_refcount_tree*
308ocfs2_allocate_refcount_tree(struct ocfs2_super *osb, u64 rf_blkno)
309{
310 struct ocfs2_refcount_tree *new;
311
312 new = kzalloc(sizeof(struct ocfs2_refcount_tree), GFP_NOFS);
313 if (!new)
314 return NULL;
315
316 new->rf_blkno = rf_blkno;
317 kref_init(&new->rf_getcnt);
318 ocfs2_init_refcount_tree_ci(new, osb->sb);
319
320 return new;
321}
322
323static int ocfs2_get_refcount_tree(struct ocfs2_super *osb, u64 rf_blkno,
324 struct ocfs2_refcount_tree **ret_tree)
325{
326 int ret = 0;
327 struct ocfs2_refcount_tree *tree, *new = NULL;
328 struct buffer_head *ref_root_bh = NULL;
329 struct ocfs2_refcount_block *ref_rb;
330
331 spin_lock(&osb->osb_lock);
332 if (osb->osb_ref_tree_lru &&
333 osb->osb_ref_tree_lru->rf_blkno == rf_blkno)
334 tree = osb->osb_ref_tree_lru;
335 else
336 tree = ocfs2_find_refcount_tree(osb, rf_blkno);
337 if (tree)
338 goto out;
339
340 spin_unlock(&osb->osb_lock);
341
342 new = ocfs2_allocate_refcount_tree(osb, rf_blkno);
343 if (!new) {
344 ret = -ENOMEM;
345 mlog_errno(ret);
346 return ret;
347 }
348 /*
349 * We need the generation to create the refcount tree lock and since
350 * it isn't changed during the tree modification, we are safe here to
351 * read without protection.
352 * We also have to purge the cache after we create the lock since the
353 * refcount block may have the stale data. It can only be trusted when
354 * we hold the refcount lock.
355 */
356 ret = ocfs2_read_refcount_block(&new->rf_ci, rf_blkno, &ref_root_bh);
357 if (ret) {
358 mlog_errno(ret);
359 ocfs2_metadata_cache_exit(&new->rf_ci);
360 kfree(new);
361 return ret;
362 }
363
364 ref_rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
365 new->rf_generation = le32_to_cpu(ref_rb->rf_generation);
366 ocfs2_init_refcount_tree_lock(osb, new, rf_blkno,
367 new->rf_generation);
368 ocfs2_metadata_cache_purge(&new->rf_ci);
369
370 spin_lock(&osb->osb_lock);
371 tree = ocfs2_find_refcount_tree(osb, rf_blkno);
372 if (tree)
373 goto out;
374
375 ocfs2_insert_refcount_tree(osb, new);
376
377 tree = new;
378 new = NULL;
379
380out:
381 *ret_tree = tree;
382
383 osb->osb_ref_tree_lru = tree;
384
385 spin_unlock(&osb->osb_lock);
386
387 if (new)
388 ocfs2_free_refcount_tree(new);
389
390 brelse(ref_root_bh);
391 return ret;
392}
393
394static int ocfs2_get_refcount_block(struct inode *inode, u64 *ref_blkno)
395{
396 int ret;
397 struct buffer_head *di_bh = NULL;
398 struct ocfs2_dinode *di;
399
400 ret = ocfs2_read_inode_block(inode, &di_bh);
401 if (ret) {
402 mlog_errno(ret);
403 goto out;
404 }
405
406 BUG_ON(!ocfs2_is_refcount_inode(inode));
407
408 di = (struct ocfs2_dinode *)di_bh->b_data;
409 *ref_blkno = le64_to_cpu(di->i_refcount_loc);
410 brelse(di_bh);
411out:
412 return ret;
413}
414
415static int __ocfs2_lock_refcount_tree(struct ocfs2_super *osb,
416 struct ocfs2_refcount_tree *tree, int rw)
417{
418 int ret;
419
420 ret = ocfs2_refcount_lock(tree, rw);
421 if (ret) {
422 mlog_errno(ret);
423 goto out;
424 }
425
426 if (rw)
427 down_write(&tree->rf_sem);
428 else
429 down_read(&tree->rf_sem);
430
431out:
432 return ret;
433}
434
435/*
436 * Lock the refcount tree pointed by ref_blkno and return the tree.
437 * In most case, we lock the tree and read the refcount block.
438 * So read it here if the caller really needs it.
439 *
440 * If the tree has been re-created by other node, it will free the
441 * old one and re-create it.
442 */
443int ocfs2_lock_refcount_tree(struct ocfs2_super *osb,
444 u64 ref_blkno, int rw,
445 struct ocfs2_refcount_tree **ret_tree,
446 struct buffer_head **ref_bh)
447{
448 int ret, delete_tree = 0;
449 struct ocfs2_refcount_tree *tree = NULL;
450 struct buffer_head *ref_root_bh = NULL;
451 struct ocfs2_refcount_block *rb;
452
453again:
454 ret = ocfs2_get_refcount_tree(osb, ref_blkno, &tree);
455 if (ret) {
456 mlog_errno(ret);
457 return ret;
458 }
459
460 ocfs2_refcount_tree_get(tree);
461
462 ret = __ocfs2_lock_refcount_tree(osb, tree, rw);
463 if (ret) {
464 mlog_errno(ret);
465 ocfs2_refcount_tree_put(tree);
466 goto out;
467 }
468
469 ret = ocfs2_read_refcount_block(&tree->rf_ci, tree->rf_blkno,
470 &ref_root_bh);
471 if (ret) {
472 mlog_errno(ret);
473 ocfs2_unlock_refcount_tree(osb, tree, rw);
474 goto out;
475 }
476
477 rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
478 /*
479 * If the refcount block has been freed and re-created, we may need
480 * to recreate the refcount tree also.
481 *
482 * Here we just remove the tree from the rb-tree, and the last
483 * kref holder will unlock and delete this refcount_tree.
484 * Then we goto "again" and ocfs2_get_refcount_tree will create
485 * the new refcount tree for us.
486 */
487 if (tree->rf_generation != le32_to_cpu(rb->rf_generation)) {
488 if (!tree->rf_removed) {
489 ocfs2_erase_refcount_tree_from_list(osb, tree);
490 tree->rf_removed = 1;
491 delete_tree = 1;
492 }
493
494 ocfs2_unlock_refcount_tree(osb, tree, rw);
495 /*
496 * We get an extra reference when we create the refcount
497 * tree, so another put will destroy it.
498 */
499 if (delete_tree)
500 ocfs2_refcount_tree_put(tree);
501 brelse(ref_root_bh);
502 ref_root_bh = NULL;
503 goto again;
504 }
505
506 *ret_tree = tree;
507 if (ref_bh) {
508 *ref_bh = ref_root_bh;
509 ref_root_bh = NULL;
510 }
511out:
512 brelse(ref_root_bh);
513 return ret;
514}
515
516void ocfs2_unlock_refcount_tree(struct ocfs2_super *osb,
517 struct ocfs2_refcount_tree *tree, int rw)
518{
519 if (rw)
520 up_write(&tree->rf_sem);
521 else
522 up_read(&tree->rf_sem);
523
524 ocfs2_refcount_unlock(tree, rw);
525 ocfs2_refcount_tree_put(tree);
526}
527
528void ocfs2_purge_refcount_trees(struct ocfs2_super *osb)
529{
530 struct rb_node *node;
531 struct ocfs2_refcount_tree *tree;
532 struct rb_root *root = &osb->osb_rf_lock_tree;
533
534 while ((node = rb_last(root)) != NULL) {
535 tree = rb_entry(node, struct ocfs2_refcount_tree, rf_node);
536
537 trace_ocfs2_purge_refcount_trees(
538 (unsigned long long) tree->rf_blkno);
539
540 rb_erase(&tree->rf_node, root);
541 ocfs2_free_refcount_tree(tree);
542 }
543}
544
545/*
546 * Create a refcount tree for an inode.
547 * We take for granted that the inode is already locked.
548 */
549static int ocfs2_create_refcount_tree(struct inode *inode,
550 struct buffer_head *di_bh)
551{
552 int ret;
553 handle_t *handle = NULL;
554 struct ocfs2_alloc_context *meta_ac = NULL;
555 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
556 struct ocfs2_inode_info *oi = OCFS2_I(inode);
557 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
558 struct buffer_head *new_bh = NULL;
559 struct ocfs2_refcount_block *rb;
560 struct ocfs2_refcount_tree *new_tree = NULL, *tree = NULL;
561 u16 suballoc_bit_start;
562 u32 num_got;
563 u64 suballoc_loc, first_blkno;
564
565 BUG_ON(ocfs2_is_refcount_inode(inode));
566
567 trace_ocfs2_create_refcount_tree(
568 (unsigned long long)oi->ip_blkno);
569
570 ret = ocfs2_reserve_new_metadata_blocks(osb, 1, &meta_ac);
571 if (ret) {
572 mlog_errno(ret);
573 goto out;
574 }
575
576 handle = ocfs2_start_trans(osb, OCFS2_REFCOUNT_TREE_CREATE_CREDITS);
577 if (IS_ERR(handle)) {
578 ret = PTR_ERR(handle);
579 mlog_errno(ret);
580 goto out;
581 }
582
583 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
584 OCFS2_JOURNAL_ACCESS_WRITE);
585 if (ret) {
586 mlog_errno(ret);
587 goto out_commit;
588 }
589
590 ret = ocfs2_claim_metadata(handle, meta_ac, 1, &suballoc_loc,
591 &suballoc_bit_start, &num_got,
592 &first_blkno);
593 if (ret) {
594 mlog_errno(ret);
595 goto out_commit;
596 }
597
598 new_tree = ocfs2_allocate_refcount_tree(osb, first_blkno);
599 if (!new_tree) {
600 ret = -ENOMEM;
601 mlog_errno(ret);
602 goto out_commit;
603 }
604
605 new_bh = sb_getblk(inode->i_sb, first_blkno);
606 if (!new_bh) {
607 ret = -ENOMEM;
608 mlog_errno(ret);
609 goto out_commit;
610 }
611 ocfs2_set_new_buffer_uptodate(&new_tree->rf_ci, new_bh);
612
613 ret = ocfs2_journal_access_rb(handle, &new_tree->rf_ci, new_bh,
614 OCFS2_JOURNAL_ACCESS_CREATE);
615 if (ret) {
616 mlog_errno(ret);
617 goto out_commit;
618 }
619
620 /* Initialize ocfs2_refcount_block. */
621 rb = (struct ocfs2_refcount_block *)new_bh->b_data;
622 memset(rb, 0, inode->i_sb->s_blocksize);
623 strcpy((void *)rb, OCFS2_REFCOUNT_BLOCK_SIGNATURE);
624 rb->rf_suballoc_slot = cpu_to_le16(meta_ac->ac_alloc_slot);
625 rb->rf_suballoc_loc = cpu_to_le64(suballoc_loc);
626 rb->rf_suballoc_bit = cpu_to_le16(suballoc_bit_start);
627 rb->rf_fs_generation = cpu_to_le32(osb->fs_generation);
628 rb->rf_blkno = cpu_to_le64(first_blkno);
629 rb->rf_count = cpu_to_le32(1);
630 rb->rf_records.rl_count =
631 cpu_to_le16(ocfs2_refcount_recs_per_rb(osb->sb));
632 spin_lock(&osb->osb_lock);
633 rb->rf_generation = osb->s_next_generation++;
634 spin_unlock(&osb->osb_lock);
635
636 ocfs2_journal_dirty(handle, new_bh);
637
638 spin_lock(&oi->ip_lock);
639 oi->ip_dyn_features |= OCFS2_HAS_REFCOUNT_FL;
640 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
641 di->i_refcount_loc = cpu_to_le64(first_blkno);
642 spin_unlock(&oi->ip_lock);
643
644 trace_ocfs2_create_refcount_tree_blkno((unsigned long long)first_blkno);
645
646 ocfs2_journal_dirty(handle, di_bh);
647
648 /*
649 * We have to init the tree lock here since it will use
650 * the generation number to create it.
651 */
652 new_tree->rf_generation = le32_to_cpu(rb->rf_generation);
653 ocfs2_init_refcount_tree_lock(osb, new_tree, first_blkno,
654 new_tree->rf_generation);
655
656 spin_lock(&osb->osb_lock);
657 tree = ocfs2_find_refcount_tree(osb, first_blkno);
658
659 /*
660 * We've just created a new refcount tree in this block. If
661 * we found a refcount tree on the ocfs2_super, it must be
662 * one we just deleted. We free the old tree before
663 * inserting the new tree.
664 */
665 BUG_ON(tree && tree->rf_generation == new_tree->rf_generation);
666 if (tree)
667 ocfs2_erase_refcount_tree_from_list_no_lock(osb, tree);
668 ocfs2_insert_refcount_tree(osb, new_tree);
669 spin_unlock(&osb->osb_lock);
670 new_tree = NULL;
671 if (tree)
672 ocfs2_refcount_tree_put(tree);
673
674out_commit:
675 ocfs2_commit_trans(osb, handle);
676
677out:
678 if (new_tree) {
679 ocfs2_metadata_cache_exit(&new_tree->rf_ci);
680 kfree(new_tree);
681 }
682
683 brelse(new_bh);
684 if (meta_ac)
685 ocfs2_free_alloc_context(meta_ac);
686
687 return ret;
688}
689
690static int ocfs2_set_refcount_tree(struct inode *inode,
691 struct buffer_head *di_bh,
692 u64 refcount_loc)
693{
694 int ret;
695 handle_t *handle = NULL;
696 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
697 struct ocfs2_inode_info *oi = OCFS2_I(inode);
698 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
699 struct buffer_head *ref_root_bh = NULL;
700 struct ocfs2_refcount_block *rb;
701 struct ocfs2_refcount_tree *ref_tree;
702
703 BUG_ON(ocfs2_is_refcount_inode(inode));
704
705 ret = ocfs2_lock_refcount_tree(osb, refcount_loc, 1,
706 &ref_tree, &ref_root_bh);
707 if (ret) {
708 mlog_errno(ret);
709 return ret;
710 }
711
712 handle = ocfs2_start_trans(osb, OCFS2_REFCOUNT_TREE_SET_CREDITS);
713 if (IS_ERR(handle)) {
714 ret = PTR_ERR(handle);
715 mlog_errno(ret);
716 goto out;
717 }
718
719 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
720 OCFS2_JOURNAL_ACCESS_WRITE);
721 if (ret) {
722 mlog_errno(ret);
723 goto out_commit;
724 }
725
726 ret = ocfs2_journal_access_rb(handle, &ref_tree->rf_ci, ref_root_bh,
727 OCFS2_JOURNAL_ACCESS_WRITE);
728 if (ret) {
729 mlog_errno(ret);
730 goto out_commit;
731 }
732
733 rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
734 le32_add_cpu(&rb->rf_count, 1);
735
736 ocfs2_journal_dirty(handle, ref_root_bh);
737
738 spin_lock(&oi->ip_lock);
739 oi->ip_dyn_features |= OCFS2_HAS_REFCOUNT_FL;
740 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
741 di->i_refcount_loc = cpu_to_le64(refcount_loc);
742 spin_unlock(&oi->ip_lock);
743 ocfs2_journal_dirty(handle, di_bh);
744
745out_commit:
746 ocfs2_commit_trans(osb, handle);
747out:
748 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
749 brelse(ref_root_bh);
750
751 return ret;
752}
753
754int ocfs2_remove_refcount_tree(struct inode *inode, struct buffer_head *di_bh)
755{
756 int ret, delete_tree = 0;
757 handle_t *handle = NULL;
758 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
759 struct ocfs2_inode_info *oi = OCFS2_I(inode);
760 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
761 struct ocfs2_refcount_block *rb;
762 struct inode *alloc_inode = NULL;
763 struct buffer_head *alloc_bh = NULL;
764 struct buffer_head *blk_bh = NULL;
765 struct ocfs2_refcount_tree *ref_tree;
766 int credits = OCFS2_REFCOUNT_TREE_REMOVE_CREDITS;
767 u64 blk = 0, bg_blkno = 0, ref_blkno = le64_to_cpu(di->i_refcount_loc);
768 u16 bit = 0;
769
770 if (!ocfs2_is_refcount_inode(inode))
771 return 0;
772
773 BUG_ON(!ref_blkno);
774 ret = ocfs2_lock_refcount_tree(osb, ref_blkno, 1, &ref_tree, &blk_bh);
775 if (ret) {
776 mlog_errno(ret);
777 return ret;
778 }
779
780 rb = (struct ocfs2_refcount_block *)blk_bh->b_data;
781
782 /*
783 * If we are the last user, we need to free the block.
784 * So lock the allocator ahead.
785 */
786 if (le32_to_cpu(rb->rf_count) == 1) {
787 blk = le64_to_cpu(rb->rf_blkno);
788 bit = le16_to_cpu(rb->rf_suballoc_bit);
789 if (rb->rf_suballoc_loc)
790 bg_blkno = le64_to_cpu(rb->rf_suballoc_loc);
791 else
792 bg_blkno = ocfs2_which_suballoc_group(blk, bit);
793
794 alloc_inode = ocfs2_get_system_file_inode(osb,
795 EXTENT_ALLOC_SYSTEM_INODE,
796 le16_to_cpu(rb->rf_suballoc_slot));
797 if (!alloc_inode) {
798 ret = -ENOMEM;
799 mlog_errno(ret);
800 goto out;
801 }
802 inode_lock(alloc_inode);
803
804 ret = ocfs2_inode_lock(alloc_inode, &alloc_bh, 1);
805 if (ret) {
806 mlog_errno(ret);
807 goto out_mutex;
808 }
809
810 credits += OCFS2_SUBALLOC_FREE;
811 }
812
813 handle = ocfs2_start_trans(osb, credits);
814 if (IS_ERR(handle)) {
815 ret = PTR_ERR(handle);
816 mlog_errno(ret);
817 goto out_unlock;
818 }
819
820 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
821 OCFS2_JOURNAL_ACCESS_WRITE);
822 if (ret) {
823 mlog_errno(ret);
824 goto out_commit;
825 }
826
827 ret = ocfs2_journal_access_rb(handle, &ref_tree->rf_ci, blk_bh,
828 OCFS2_JOURNAL_ACCESS_WRITE);
829 if (ret) {
830 mlog_errno(ret);
831 goto out_commit;
832 }
833
834 spin_lock(&oi->ip_lock);
835 oi->ip_dyn_features &= ~OCFS2_HAS_REFCOUNT_FL;
836 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
837 di->i_refcount_loc = 0;
838 spin_unlock(&oi->ip_lock);
839 ocfs2_journal_dirty(handle, di_bh);
840
841 le32_add_cpu(&rb->rf_count , -1);
842 ocfs2_journal_dirty(handle, blk_bh);
843
844 if (!rb->rf_count) {
845 delete_tree = 1;
846 ocfs2_erase_refcount_tree_from_list(osb, ref_tree);
847 ret = ocfs2_free_suballoc_bits(handle, alloc_inode,
848 alloc_bh, bit, bg_blkno, 1);
849 if (ret)
850 mlog_errno(ret);
851 }
852
853out_commit:
854 ocfs2_commit_trans(osb, handle);
855out_unlock:
856 if (alloc_inode) {
857 ocfs2_inode_unlock(alloc_inode, 1);
858 brelse(alloc_bh);
859 }
860out_mutex:
861 if (alloc_inode) {
862 inode_unlock(alloc_inode);
863 iput(alloc_inode);
864 }
865out:
866 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
867 if (delete_tree)
868 ocfs2_refcount_tree_put(ref_tree);
869 brelse(blk_bh);
870
871 return ret;
872}
873
874static void ocfs2_find_refcount_rec_in_rl(struct ocfs2_caching_info *ci,
875 struct buffer_head *ref_leaf_bh,
876 u64 cpos, unsigned int len,
877 struct ocfs2_refcount_rec *ret_rec,
878 int *index)
879{
880 int i = 0;
881 struct ocfs2_refcount_block *rb =
882 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
883 struct ocfs2_refcount_rec *rec = NULL;
884
885 for (; i < le16_to_cpu(rb->rf_records.rl_used); i++) {
886 rec = &rb->rf_records.rl_recs[i];
887
888 if (le64_to_cpu(rec->r_cpos) +
889 le32_to_cpu(rec->r_clusters) <= cpos)
890 continue;
891 else if (le64_to_cpu(rec->r_cpos) > cpos)
892 break;
893
894 /* ok, cpos fail in this rec. Just return. */
895 if (ret_rec)
896 *ret_rec = *rec;
897 goto out;
898 }
899
900 if (ret_rec) {
901 /* We meet with a hole here, so fake the rec. */
902 ret_rec->r_cpos = cpu_to_le64(cpos);
903 ret_rec->r_refcount = 0;
904 if (i < le16_to_cpu(rb->rf_records.rl_used) &&
905 le64_to_cpu(rec->r_cpos) < cpos + len)
906 ret_rec->r_clusters =
907 cpu_to_le32(le64_to_cpu(rec->r_cpos) - cpos);
908 else
909 ret_rec->r_clusters = cpu_to_le32(len);
910 }
911
912out:
913 *index = i;
914}
915
916/*
917 * Try to remove refcount tree. The mechanism is:
918 * 1) Check whether i_clusters == 0, if no, exit.
919 * 2) check whether we have i_xattr_loc in dinode. if yes, exit.
920 * 3) Check whether we have inline xattr stored outside, if yes, exit.
921 * 4) Remove the tree.
922 */
923int ocfs2_try_remove_refcount_tree(struct inode *inode,
924 struct buffer_head *di_bh)
925{
926 int ret;
927 struct ocfs2_inode_info *oi = OCFS2_I(inode);
928 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
929
930 down_write(&oi->ip_xattr_sem);
931 down_write(&oi->ip_alloc_sem);
932
933 if (oi->ip_clusters)
934 goto out;
935
936 if ((oi->ip_dyn_features & OCFS2_HAS_XATTR_FL) && di->i_xattr_loc)
937 goto out;
938
939 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL &&
940 ocfs2_has_inline_xattr_value_outside(inode, di))
941 goto out;
942
943 ret = ocfs2_remove_refcount_tree(inode, di_bh);
944 if (ret)
945 mlog_errno(ret);
946out:
947 up_write(&oi->ip_alloc_sem);
948 up_write(&oi->ip_xattr_sem);
949 return 0;
950}
951
952/*
953 * Find the end range for a leaf refcount block indicated by
954 * el->l_recs[index].e_blkno.
955 */
956static int ocfs2_get_refcount_cpos_end(struct ocfs2_caching_info *ci,
957 struct buffer_head *ref_root_bh,
958 struct ocfs2_extent_block *eb,
959 struct ocfs2_extent_list *el,
960 int index, u32 *cpos_end)
961{
962 int ret, i, subtree_root;
963 u32 cpos;
964 u64 blkno;
965 struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
966 struct ocfs2_path *left_path = NULL, *right_path = NULL;
967 struct ocfs2_extent_tree et;
968 struct ocfs2_extent_list *tmp_el;
969
970 if (index < le16_to_cpu(el->l_next_free_rec) - 1) {
971 /*
972 * We have a extent rec after index, so just use the e_cpos
973 * of the next extent rec.
974 */
975 *cpos_end = le32_to_cpu(el->l_recs[index+1].e_cpos);
976 return 0;
977 }
978
979 if (!eb || !eb->h_next_leaf_blk) {
980 /*
981 * We are the last extent rec, so any high cpos should
982 * be stored in this leaf refcount block.
983 */
984 *cpos_end = UINT_MAX;
985 return 0;
986 }
987
988 /*
989 * If the extent block isn't the last one, we have to find
990 * the subtree root between this extent block and the next
991 * leaf extent block and get the corresponding e_cpos from
992 * the subroot. Otherwise we may corrupt the b-tree.
993 */
994 ocfs2_init_refcount_extent_tree(&et, ci, ref_root_bh);
995
996 left_path = ocfs2_new_path_from_et(&et);
997 if (!left_path) {
998 ret = -ENOMEM;
999 mlog_errno(ret);
1000 goto out;
1001 }
1002
1003 cpos = le32_to_cpu(eb->h_list.l_recs[index].e_cpos);
1004 ret = ocfs2_find_path(ci, left_path, cpos);
1005 if (ret) {
1006 mlog_errno(ret);
1007 goto out;
1008 }
1009
1010 right_path = ocfs2_new_path_from_path(left_path);
1011 if (!right_path) {
1012 ret = -ENOMEM;
1013 mlog_errno(ret);
1014 goto out;
1015 }
1016
1017 ret = ocfs2_find_cpos_for_right_leaf(sb, left_path, &cpos);
1018 if (ret) {
1019 mlog_errno(ret);
1020 goto out;
1021 }
1022
1023 ret = ocfs2_find_path(ci, right_path, cpos);
1024 if (ret) {
1025 mlog_errno(ret);
1026 goto out;
1027 }
1028
1029 subtree_root = ocfs2_find_subtree_root(&et, left_path,
1030 right_path);
1031
1032 tmp_el = left_path->p_node[subtree_root].el;
1033 blkno = left_path->p_node[subtree_root+1].bh->b_blocknr;
1034 for (i = 0; i < le16_to_cpu(tmp_el->l_next_free_rec); i++) {
1035 if (le64_to_cpu(tmp_el->l_recs[i].e_blkno) == blkno) {
1036 *cpos_end = le32_to_cpu(tmp_el->l_recs[i+1].e_cpos);
1037 break;
1038 }
1039 }
1040
1041 BUG_ON(i == le16_to_cpu(tmp_el->l_next_free_rec));
1042
1043out:
1044 ocfs2_free_path(left_path);
1045 ocfs2_free_path(right_path);
1046 return ret;
1047}
1048
1049/*
1050 * Given a cpos and len, try to find the refcount record which contains cpos.
1051 * 1. If cpos can be found in one refcount record, return the record.
1052 * 2. If cpos can't be found, return a fake record which start from cpos
1053 * and end at a small value between cpos+len and start of the next record.
1054 * This fake record has r_refcount = 0.
1055 */
1056static int ocfs2_get_refcount_rec(struct ocfs2_caching_info *ci,
1057 struct buffer_head *ref_root_bh,
1058 u64 cpos, unsigned int len,
1059 struct ocfs2_refcount_rec *ret_rec,
1060 int *index,
1061 struct buffer_head **ret_bh)
1062{
1063 int ret = 0, i, found;
1064 u32 low_cpos, cpos_end;
1065 struct ocfs2_extent_list *el;
1066 struct ocfs2_extent_rec *rec = NULL;
1067 struct ocfs2_extent_block *eb = NULL;
1068 struct buffer_head *eb_bh = NULL, *ref_leaf_bh = NULL;
1069 struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
1070 struct ocfs2_refcount_block *rb =
1071 (struct ocfs2_refcount_block *)ref_root_bh->b_data;
1072
1073 if (!(le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL)) {
1074 ocfs2_find_refcount_rec_in_rl(ci, ref_root_bh, cpos, len,
1075 ret_rec, index);
1076 *ret_bh = ref_root_bh;
1077 get_bh(ref_root_bh);
1078 return 0;
1079 }
1080
1081 el = &rb->rf_list;
1082 low_cpos = cpos & OCFS2_32BIT_POS_MASK;
1083
1084 if (el->l_tree_depth) {
1085 ret = ocfs2_find_leaf(ci, el, low_cpos, &eb_bh);
1086 if (ret) {
1087 mlog_errno(ret);
1088 goto out;
1089 }
1090
1091 eb = (struct ocfs2_extent_block *) eb_bh->b_data;
1092 el = &eb->h_list;
1093
1094 if (el->l_tree_depth) {
1095 ret = ocfs2_error(sb,
1096 "refcount tree %llu has non zero tree depth in leaf btree tree block %llu\n",
1097 (unsigned long long)ocfs2_metadata_cache_owner(ci),
1098 (unsigned long long)eb_bh->b_blocknr);
1099 goto out;
1100 }
1101 }
1102
1103 found = 0;
1104 for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
1105 rec = &el->l_recs[i];
1106
1107 if (le32_to_cpu(rec->e_cpos) <= low_cpos) {
1108 found = 1;
1109 break;
1110 }
1111 }
1112
1113 if (found) {
1114 ret = ocfs2_get_refcount_cpos_end(ci, ref_root_bh,
1115 eb, el, i, &cpos_end);
1116 if (ret) {
1117 mlog_errno(ret);
1118 goto out;
1119 }
1120
1121 if (cpos_end < low_cpos + len)
1122 len = cpos_end - low_cpos;
1123 }
1124
1125 ret = ocfs2_read_refcount_block(ci, le64_to_cpu(rec->e_blkno),
1126 &ref_leaf_bh);
1127 if (ret) {
1128 mlog_errno(ret);
1129 goto out;
1130 }
1131
1132 ocfs2_find_refcount_rec_in_rl(ci, ref_leaf_bh, cpos, len,
1133 ret_rec, index);
1134 *ret_bh = ref_leaf_bh;
1135out:
1136 brelse(eb_bh);
1137 return ret;
1138}
1139
1140enum ocfs2_ref_rec_contig {
1141 REF_CONTIG_NONE = 0,
1142 REF_CONTIG_LEFT,
1143 REF_CONTIG_RIGHT,
1144 REF_CONTIG_LEFTRIGHT,
1145};
1146
1147static enum ocfs2_ref_rec_contig
1148 ocfs2_refcount_rec_adjacent(struct ocfs2_refcount_block *rb,
1149 int index)
1150{
1151 if ((rb->rf_records.rl_recs[index].r_refcount ==
1152 rb->rf_records.rl_recs[index + 1].r_refcount) &&
1153 (le64_to_cpu(rb->rf_records.rl_recs[index].r_cpos) +
1154 le32_to_cpu(rb->rf_records.rl_recs[index].r_clusters) ==
1155 le64_to_cpu(rb->rf_records.rl_recs[index + 1].r_cpos)))
1156 return REF_CONTIG_RIGHT;
1157
1158 return REF_CONTIG_NONE;
1159}
1160
1161static enum ocfs2_ref_rec_contig
1162 ocfs2_refcount_rec_contig(struct ocfs2_refcount_block *rb,
1163 int index)
1164{
1165 enum ocfs2_ref_rec_contig ret = REF_CONTIG_NONE;
1166
1167 if (index < le16_to_cpu(rb->rf_records.rl_used) - 1)
1168 ret = ocfs2_refcount_rec_adjacent(rb, index);
1169
1170 if (index > 0) {
1171 enum ocfs2_ref_rec_contig tmp;
1172
1173 tmp = ocfs2_refcount_rec_adjacent(rb, index - 1);
1174
1175 if (tmp == REF_CONTIG_RIGHT) {
1176 if (ret == REF_CONTIG_RIGHT)
1177 ret = REF_CONTIG_LEFTRIGHT;
1178 else
1179 ret = REF_CONTIG_LEFT;
1180 }
1181 }
1182
1183 return ret;
1184}
1185
1186static void ocfs2_rotate_refcount_rec_left(struct ocfs2_refcount_block *rb,
1187 int index)
1188{
1189 BUG_ON(rb->rf_records.rl_recs[index].r_refcount !=
1190 rb->rf_records.rl_recs[index+1].r_refcount);
1191
1192 le32_add_cpu(&rb->rf_records.rl_recs[index].r_clusters,
1193 le32_to_cpu(rb->rf_records.rl_recs[index+1].r_clusters));
1194
1195 if (index < le16_to_cpu(rb->rf_records.rl_used) - 2)
1196 memmove(&rb->rf_records.rl_recs[index + 1],
1197 &rb->rf_records.rl_recs[index + 2],
1198 sizeof(struct ocfs2_refcount_rec) *
1199 (le16_to_cpu(rb->rf_records.rl_used) - index - 2));
1200
1201 memset(&rb->rf_records.rl_recs[le16_to_cpu(rb->rf_records.rl_used) - 1],
1202 0, sizeof(struct ocfs2_refcount_rec));
1203 le16_add_cpu(&rb->rf_records.rl_used, -1);
1204}
1205
1206/*
1207 * Merge the refcount rec if we are contiguous with the adjacent recs.
1208 */
1209static void ocfs2_refcount_rec_merge(struct ocfs2_refcount_block *rb,
1210 int index)
1211{
1212 enum ocfs2_ref_rec_contig contig =
1213 ocfs2_refcount_rec_contig(rb, index);
1214
1215 if (contig == REF_CONTIG_NONE)
1216 return;
1217
1218 if (contig == REF_CONTIG_LEFT || contig == REF_CONTIG_LEFTRIGHT) {
1219 BUG_ON(index == 0);
1220 index--;
1221 }
1222
1223 ocfs2_rotate_refcount_rec_left(rb, index);
1224
1225 if (contig == REF_CONTIG_LEFTRIGHT)
1226 ocfs2_rotate_refcount_rec_left(rb, index);
1227}
1228
1229/*
1230 * Change the refcount indexed by "index" in ref_bh.
1231 * If refcount reaches 0, remove it.
1232 */
1233static int ocfs2_change_refcount_rec(handle_t *handle,
1234 struct ocfs2_caching_info *ci,
1235 struct buffer_head *ref_leaf_bh,
1236 int index, int merge, int change)
1237{
1238 int ret;
1239 struct ocfs2_refcount_block *rb =
1240 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
1241 struct ocfs2_refcount_list *rl = &rb->rf_records;
1242 struct ocfs2_refcount_rec *rec = &rl->rl_recs[index];
1243
1244 ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh,
1245 OCFS2_JOURNAL_ACCESS_WRITE);
1246 if (ret) {
1247 mlog_errno(ret);
1248 goto out;
1249 }
1250
1251 trace_ocfs2_change_refcount_rec(
1252 (unsigned long long)ocfs2_metadata_cache_owner(ci),
1253 index, le32_to_cpu(rec->r_refcount), change);
1254 le32_add_cpu(&rec->r_refcount, change);
1255
1256 if (!rec->r_refcount) {
1257 if (index != le16_to_cpu(rl->rl_used) - 1) {
1258 memmove(rec, rec + 1,
1259 (le16_to_cpu(rl->rl_used) - index - 1) *
1260 sizeof(struct ocfs2_refcount_rec));
1261 memset(&rl->rl_recs[le16_to_cpu(rl->rl_used) - 1],
1262 0, sizeof(struct ocfs2_refcount_rec));
1263 }
1264
1265 le16_add_cpu(&rl->rl_used, -1);
1266 } else if (merge)
1267 ocfs2_refcount_rec_merge(rb, index);
1268
1269 ocfs2_journal_dirty(handle, ref_leaf_bh);
1270out:
1271 return ret;
1272}
1273
1274static int ocfs2_expand_inline_ref_root(handle_t *handle,
1275 struct ocfs2_caching_info *ci,
1276 struct buffer_head *ref_root_bh,
1277 struct buffer_head **ref_leaf_bh,
1278 struct ocfs2_alloc_context *meta_ac)
1279{
1280 int ret;
1281 u16 suballoc_bit_start;
1282 u32 num_got;
1283 u64 suballoc_loc, blkno;
1284 struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
1285 struct buffer_head *new_bh = NULL;
1286 struct ocfs2_refcount_block *new_rb;
1287 struct ocfs2_refcount_block *root_rb =
1288 (struct ocfs2_refcount_block *)ref_root_bh->b_data;
1289
1290 ret = ocfs2_journal_access_rb(handle, ci, ref_root_bh,
1291 OCFS2_JOURNAL_ACCESS_WRITE);
1292 if (ret) {
1293 mlog_errno(ret);
1294 goto out;
1295 }
1296
1297 ret = ocfs2_claim_metadata(handle, meta_ac, 1, &suballoc_loc,
1298 &suballoc_bit_start, &num_got,
1299 &blkno);
1300 if (ret) {
1301 mlog_errno(ret);
1302 goto out;
1303 }
1304
1305 new_bh = sb_getblk(sb, blkno);
1306 if (new_bh == NULL) {
1307 ret = -ENOMEM;
1308 mlog_errno(ret);
1309 goto out;
1310 }
1311 ocfs2_set_new_buffer_uptodate(ci, new_bh);
1312
1313 ret = ocfs2_journal_access_rb(handle, ci, new_bh,
1314 OCFS2_JOURNAL_ACCESS_CREATE);
1315 if (ret) {
1316 mlog_errno(ret);
1317 goto out;
1318 }
1319
1320 /*
1321 * Initialize ocfs2_refcount_block.
1322 * It should contain the same information as the old root.
1323 * so just memcpy it and change the corresponding field.
1324 */
1325 memcpy(new_bh->b_data, ref_root_bh->b_data, sb->s_blocksize);
1326
1327 new_rb = (struct ocfs2_refcount_block *)new_bh->b_data;
1328 new_rb->rf_suballoc_slot = cpu_to_le16(meta_ac->ac_alloc_slot);
1329 new_rb->rf_suballoc_loc = cpu_to_le64(suballoc_loc);
1330 new_rb->rf_suballoc_bit = cpu_to_le16(suballoc_bit_start);
1331 new_rb->rf_blkno = cpu_to_le64(blkno);
1332 new_rb->rf_cpos = cpu_to_le32(0);
1333 new_rb->rf_parent = cpu_to_le64(ref_root_bh->b_blocknr);
1334 new_rb->rf_flags = cpu_to_le32(OCFS2_REFCOUNT_LEAF_FL);
1335 ocfs2_journal_dirty(handle, new_bh);
1336
1337 /* Now change the root. */
1338 memset(&root_rb->rf_list, 0, sb->s_blocksize -
1339 offsetof(struct ocfs2_refcount_block, rf_list));
1340 root_rb->rf_list.l_count = cpu_to_le16(ocfs2_extent_recs_per_rb(sb));
1341 root_rb->rf_clusters = cpu_to_le32(1);
1342 root_rb->rf_list.l_next_free_rec = cpu_to_le16(1);
1343 root_rb->rf_list.l_recs[0].e_blkno = cpu_to_le64(blkno);
1344 root_rb->rf_list.l_recs[0].e_leaf_clusters = cpu_to_le16(1);
1345 root_rb->rf_flags = cpu_to_le32(OCFS2_REFCOUNT_TREE_FL);
1346
1347 ocfs2_journal_dirty(handle, ref_root_bh);
1348
1349 trace_ocfs2_expand_inline_ref_root((unsigned long long)blkno,
1350 le16_to_cpu(new_rb->rf_records.rl_used));
1351
1352 *ref_leaf_bh = new_bh;
1353 new_bh = NULL;
1354out:
1355 brelse(new_bh);
1356 return ret;
1357}
1358
1359static int ocfs2_refcount_rec_no_intersect(struct ocfs2_refcount_rec *prev,
1360 struct ocfs2_refcount_rec *next)
1361{
1362 if (ocfs2_get_ref_rec_low_cpos(prev) + le32_to_cpu(prev->r_clusters) <=
1363 ocfs2_get_ref_rec_low_cpos(next))
1364 return 1;
1365
1366 return 0;
1367}
1368
1369static int cmp_refcount_rec_by_low_cpos(const void *a, const void *b)
1370{
1371 const struct ocfs2_refcount_rec *l = a, *r = b;
1372 u32 l_cpos = ocfs2_get_ref_rec_low_cpos(l);
1373 u32 r_cpos = ocfs2_get_ref_rec_low_cpos(r);
1374
1375 if (l_cpos > r_cpos)
1376 return 1;
1377 if (l_cpos < r_cpos)
1378 return -1;
1379 return 0;
1380}
1381
1382static int cmp_refcount_rec_by_cpos(const void *a, const void *b)
1383{
1384 const struct ocfs2_refcount_rec *l = a, *r = b;
1385 u64 l_cpos = le64_to_cpu(l->r_cpos);
1386 u64 r_cpos = le64_to_cpu(r->r_cpos);
1387
1388 if (l_cpos > r_cpos)
1389 return 1;
1390 if (l_cpos < r_cpos)
1391 return -1;
1392 return 0;
1393}
1394
1395static void swap_refcount_rec(void *a, void *b, int size)
1396{
1397 struct ocfs2_refcount_rec *l = a, *r = b;
1398
1399 swap(*l, *r);
1400}
1401
1402/*
1403 * The refcount cpos are ordered by their 64bit cpos,
1404 * But we will use the low 32 bit to be the e_cpos in the b-tree.
1405 * So we need to make sure that this pos isn't intersected with others.
1406 *
1407 * Note: The refcount block is already sorted by their low 32 bit cpos,
1408 * So just try the middle pos first, and we will exit when we find
1409 * the good position.
1410 */
1411static int ocfs2_find_refcount_split_pos(struct ocfs2_refcount_list *rl,
1412 u32 *split_pos, int *split_index)
1413{
1414 int num_used = le16_to_cpu(rl->rl_used);
1415 int delta, middle = num_used / 2;
1416
1417 for (delta = 0; delta < middle; delta++) {
1418 /* Let's check delta earlier than middle */
1419 if (ocfs2_refcount_rec_no_intersect(
1420 &rl->rl_recs[middle - delta - 1],
1421 &rl->rl_recs[middle - delta])) {
1422 *split_index = middle - delta;
1423 break;
1424 }
1425
1426 /* For even counts, don't walk off the end */
1427 if ((middle + delta + 1) == num_used)
1428 continue;
1429
1430 /* Now try delta past middle */
1431 if (ocfs2_refcount_rec_no_intersect(
1432 &rl->rl_recs[middle + delta],
1433 &rl->rl_recs[middle + delta + 1])) {
1434 *split_index = middle + delta + 1;
1435 break;
1436 }
1437 }
1438
1439 if (delta >= middle)
1440 return -ENOSPC;
1441
1442 *split_pos = ocfs2_get_ref_rec_low_cpos(&rl->rl_recs[*split_index]);
1443 return 0;
1444}
1445
1446static int ocfs2_divide_leaf_refcount_block(struct buffer_head *ref_leaf_bh,
1447 struct buffer_head *new_bh,
1448 u32 *split_cpos)
1449{
1450 int split_index = 0, num_moved, ret;
1451 u32 cpos = 0;
1452 struct ocfs2_refcount_block *rb =
1453 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
1454 struct ocfs2_refcount_list *rl = &rb->rf_records;
1455 struct ocfs2_refcount_block *new_rb =
1456 (struct ocfs2_refcount_block *)new_bh->b_data;
1457 struct ocfs2_refcount_list *new_rl = &new_rb->rf_records;
1458
1459 trace_ocfs2_divide_leaf_refcount_block(
1460 (unsigned long long)ref_leaf_bh->b_blocknr,
1461 le16_to_cpu(rl->rl_count), le16_to_cpu(rl->rl_used));
1462
1463 /*
1464 * XXX: Improvement later.
1465 * If we know all the high 32 bit cpos is the same, no need to sort.
1466 *
1467 * In order to make the whole process safe, we do:
1468 * 1. sort the entries by their low 32 bit cpos first so that we can
1469 * find the split cpos easily.
1470 * 2. call ocfs2_insert_extent to insert the new refcount block.
1471 * 3. move the refcount rec to the new block.
1472 * 4. sort the entries by their 64 bit cpos.
1473 * 5. dirty the new_rb and rb.
1474 */
1475 sort(&rl->rl_recs, le16_to_cpu(rl->rl_used),
1476 sizeof(struct ocfs2_refcount_rec),
1477 cmp_refcount_rec_by_low_cpos, swap_refcount_rec);
1478
1479 ret = ocfs2_find_refcount_split_pos(rl, &cpos, &split_index);
1480 if (ret) {
1481 mlog_errno(ret);
1482 return ret;
1483 }
1484
1485 new_rb->rf_cpos = cpu_to_le32(cpos);
1486
1487 /* move refcount records starting from split_index to the new block. */
1488 num_moved = le16_to_cpu(rl->rl_used) - split_index;
1489 memcpy(new_rl->rl_recs, &rl->rl_recs[split_index],
1490 num_moved * sizeof(struct ocfs2_refcount_rec));
1491
1492 /*ok, remove the entries we just moved over to the other block. */
1493 memset(&rl->rl_recs[split_index], 0,
1494 num_moved * sizeof(struct ocfs2_refcount_rec));
1495
1496 /* change old and new rl_used accordingly. */
1497 le16_add_cpu(&rl->rl_used, -num_moved);
1498 new_rl->rl_used = cpu_to_le16(num_moved);
1499
1500 sort(&rl->rl_recs, le16_to_cpu(rl->rl_used),
1501 sizeof(struct ocfs2_refcount_rec),
1502 cmp_refcount_rec_by_cpos, swap_refcount_rec);
1503
1504 sort(&new_rl->rl_recs, le16_to_cpu(new_rl->rl_used),
1505 sizeof(struct ocfs2_refcount_rec),
1506 cmp_refcount_rec_by_cpos, swap_refcount_rec);
1507
1508 *split_cpos = cpos;
1509 return 0;
1510}
1511
1512static int ocfs2_new_leaf_refcount_block(handle_t *handle,
1513 struct ocfs2_caching_info *ci,
1514 struct buffer_head *ref_root_bh,
1515 struct buffer_head *ref_leaf_bh,
1516 struct ocfs2_alloc_context *meta_ac)
1517{
1518 int ret;
1519 u16 suballoc_bit_start;
1520 u32 num_got, new_cpos;
1521 u64 suballoc_loc, blkno;
1522 struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
1523 struct ocfs2_refcount_block *root_rb =
1524 (struct ocfs2_refcount_block *)ref_root_bh->b_data;
1525 struct buffer_head *new_bh = NULL;
1526 struct ocfs2_refcount_block *new_rb;
1527 struct ocfs2_extent_tree ref_et;
1528
1529 BUG_ON(!(le32_to_cpu(root_rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL));
1530
1531 ret = ocfs2_journal_access_rb(handle, ci, ref_root_bh,
1532 OCFS2_JOURNAL_ACCESS_WRITE);
1533 if (ret) {
1534 mlog_errno(ret);
1535 goto out;
1536 }
1537
1538 ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh,
1539 OCFS2_JOURNAL_ACCESS_WRITE);
1540 if (ret) {
1541 mlog_errno(ret);
1542 goto out;
1543 }
1544
1545 ret = ocfs2_claim_metadata(handle, meta_ac, 1, &suballoc_loc,
1546 &suballoc_bit_start, &num_got,
1547 &blkno);
1548 if (ret) {
1549 mlog_errno(ret);
1550 goto out;
1551 }
1552
1553 new_bh = sb_getblk(sb, blkno);
1554 if (new_bh == NULL) {
1555 ret = -ENOMEM;
1556 mlog_errno(ret);
1557 goto out;
1558 }
1559 ocfs2_set_new_buffer_uptodate(ci, new_bh);
1560
1561 ret = ocfs2_journal_access_rb(handle, ci, new_bh,
1562 OCFS2_JOURNAL_ACCESS_CREATE);
1563 if (ret) {
1564 mlog_errno(ret);
1565 goto out;
1566 }
1567
1568 /* Initialize ocfs2_refcount_block. */
1569 new_rb = (struct ocfs2_refcount_block *)new_bh->b_data;
1570 memset(new_rb, 0, sb->s_blocksize);
1571 strcpy((void *)new_rb, OCFS2_REFCOUNT_BLOCK_SIGNATURE);
1572 new_rb->rf_suballoc_slot = cpu_to_le16(meta_ac->ac_alloc_slot);
1573 new_rb->rf_suballoc_loc = cpu_to_le64(suballoc_loc);
1574 new_rb->rf_suballoc_bit = cpu_to_le16(suballoc_bit_start);
1575 new_rb->rf_fs_generation = cpu_to_le32(OCFS2_SB(sb)->fs_generation);
1576 new_rb->rf_blkno = cpu_to_le64(blkno);
1577 new_rb->rf_parent = cpu_to_le64(ref_root_bh->b_blocknr);
1578 new_rb->rf_flags = cpu_to_le32(OCFS2_REFCOUNT_LEAF_FL);
1579 new_rb->rf_records.rl_count =
1580 cpu_to_le16(ocfs2_refcount_recs_per_rb(sb));
1581 new_rb->rf_generation = root_rb->rf_generation;
1582
1583 ret = ocfs2_divide_leaf_refcount_block(ref_leaf_bh, new_bh, &new_cpos);
1584 if (ret) {
1585 mlog_errno(ret);
1586 goto out;
1587 }
1588
1589 ocfs2_journal_dirty(handle, ref_leaf_bh);
1590 ocfs2_journal_dirty(handle, new_bh);
1591
1592 ocfs2_init_refcount_extent_tree(&ref_et, ci, ref_root_bh);
1593
1594 trace_ocfs2_new_leaf_refcount_block(
1595 (unsigned long long)new_bh->b_blocknr, new_cpos);
1596
1597 /* Insert the new leaf block with the specific offset cpos. */
1598 ret = ocfs2_insert_extent(handle, &ref_et, new_cpos, new_bh->b_blocknr,
1599 1, 0, meta_ac);
1600 if (ret)
1601 mlog_errno(ret);
1602
1603out:
1604 brelse(new_bh);
1605 return ret;
1606}
1607
1608static int ocfs2_expand_refcount_tree(handle_t *handle,
1609 struct ocfs2_caching_info *ci,
1610 struct buffer_head *ref_root_bh,
1611 struct buffer_head *ref_leaf_bh,
1612 struct ocfs2_alloc_context *meta_ac)
1613{
1614 int ret;
1615 struct buffer_head *expand_bh = NULL;
1616
1617 if (ref_root_bh == ref_leaf_bh) {
1618 /*
1619 * the old root bh hasn't been expanded to a b-tree,
1620 * so expand it first.
1621 */
1622 ret = ocfs2_expand_inline_ref_root(handle, ci, ref_root_bh,
1623 &expand_bh, meta_ac);
1624 if (ret) {
1625 mlog_errno(ret);
1626 goto out;
1627 }
1628 } else {
1629 expand_bh = ref_leaf_bh;
1630 get_bh(expand_bh);
1631 }
1632
1633
1634 /* Now add a new refcount block into the tree.*/
1635 ret = ocfs2_new_leaf_refcount_block(handle, ci, ref_root_bh,
1636 expand_bh, meta_ac);
1637 if (ret)
1638 mlog_errno(ret);
1639out:
1640 brelse(expand_bh);
1641 return ret;
1642}
1643
1644/*
1645 * Adjust the extent rec in b-tree representing ref_leaf_bh.
1646 *
1647 * Only called when we have inserted a new refcount rec at index 0
1648 * which means ocfs2_extent_rec.e_cpos may need some change.
1649 */
1650static int ocfs2_adjust_refcount_rec(handle_t *handle,
1651 struct ocfs2_caching_info *ci,
1652 struct buffer_head *ref_root_bh,
1653 struct buffer_head *ref_leaf_bh,
1654 struct ocfs2_refcount_rec *rec)
1655{
1656 int ret = 0, i;
1657 u32 new_cpos, old_cpos;
1658 struct ocfs2_path *path = NULL;
1659 struct ocfs2_extent_tree et;
1660 struct ocfs2_refcount_block *rb =
1661 (struct ocfs2_refcount_block *)ref_root_bh->b_data;
1662 struct ocfs2_extent_list *el;
1663
1664 if (!(le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL))
1665 goto out;
1666
1667 rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
1668 old_cpos = le32_to_cpu(rb->rf_cpos);
1669 new_cpos = le64_to_cpu(rec->r_cpos) & OCFS2_32BIT_POS_MASK;
1670 if (old_cpos <= new_cpos)
1671 goto out;
1672
1673 ocfs2_init_refcount_extent_tree(&et, ci, ref_root_bh);
1674
1675 path = ocfs2_new_path_from_et(&et);
1676 if (!path) {
1677 ret = -ENOMEM;
1678 mlog_errno(ret);
1679 goto out;
1680 }
1681
1682 ret = ocfs2_find_path(ci, path, old_cpos);
1683 if (ret) {
1684 mlog_errno(ret);
1685 goto out;
1686 }
1687
1688 /*
1689 * 2 more credits, one for the leaf refcount block, one for
1690 * the extent block contains the extent rec.
1691 */
1692 ret = ocfs2_extend_trans(handle, 2);
1693 if (ret < 0) {
1694 mlog_errno(ret);
1695 goto out;
1696 }
1697
1698 ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh,
1699 OCFS2_JOURNAL_ACCESS_WRITE);
1700 if (ret < 0) {
1701 mlog_errno(ret);
1702 goto out;
1703 }
1704
1705 ret = ocfs2_journal_access_eb(handle, ci, path_leaf_bh(path),
1706 OCFS2_JOURNAL_ACCESS_WRITE);
1707 if (ret < 0) {
1708 mlog_errno(ret);
1709 goto out;
1710 }
1711
1712 /* change the leaf extent block first. */
1713 el = path_leaf_el(path);
1714
1715 for (i = 0; i < le16_to_cpu(el->l_next_free_rec); i++)
1716 if (le32_to_cpu(el->l_recs[i].e_cpos) == old_cpos)
1717 break;
1718
1719 BUG_ON(i == le16_to_cpu(el->l_next_free_rec));
1720
1721 el->l_recs[i].e_cpos = cpu_to_le32(new_cpos);
1722
1723 /* change the r_cpos in the leaf block. */
1724 rb->rf_cpos = cpu_to_le32(new_cpos);
1725
1726 ocfs2_journal_dirty(handle, path_leaf_bh(path));
1727 ocfs2_journal_dirty(handle, ref_leaf_bh);
1728
1729out:
1730 ocfs2_free_path(path);
1731 return ret;
1732}
1733
1734static int ocfs2_insert_refcount_rec(handle_t *handle,
1735 struct ocfs2_caching_info *ci,
1736 struct buffer_head *ref_root_bh,
1737 struct buffer_head *ref_leaf_bh,
1738 struct ocfs2_refcount_rec *rec,
1739 int index, int merge,
1740 struct ocfs2_alloc_context *meta_ac)
1741{
1742 int ret;
1743 struct ocfs2_refcount_block *rb =
1744 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
1745 struct ocfs2_refcount_list *rf_list = &rb->rf_records;
1746 struct buffer_head *new_bh = NULL;
1747
1748 BUG_ON(le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL);
1749
1750 if (rf_list->rl_used == rf_list->rl_count) {
1751 u64 cpos = le64_to_cpu(rec->r_cpos);
1752 u32 len = le32_to_cpu(rec->r_clusters);
1753
1754 ret = ocfs2_expand_refcount_tree(handle, ci, ref_root_bh,
1755 ref_leaf_bh, meta_ac);
1756 if (ret) {
1757 mlog_errno(ret);
1758 goto out;
1759 }
1760
1761 ret = ocfs2_get_refcount_rec(ci, ref_root_bh,
1762 cpos, len, NULL, &index,
1763 &new_bh);
1764 if (ret) {
1765 mlog_errno(ret);
1766 goto out;
1767 }
1768
1769 ref_leaf_bh = new_bh;
1770 rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
1771 rf_list = &rb->rf_records;
1772 }
1773
1774 ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh,
1775 OCFS2_JOURNAL_ACCESS_WRITE);
1776 if (ret) {
1777 mlog_errno(ret);
1778 goto out;
1779 }
1780
1781 if (index < le16_to_cpu(rf_list->rl_used))
1782 memmove(&rf_list->rl_recs[index + 1],
1783 &rf_list->rl_recs[index],
1784 (le16_to_cpu(rf_list->rl_used) - index) *
1785 sizeof(struct ocfs2_refcount_rec));
1786
1787 trace_ocfs2_insert_refcount_rec(
1788 (unsigned long long)ref_leaf_bh->b_blocknr, index,
1789 (unsigned long long)le64_to_cpu(rec->r_cpos),
1790 le32_to_cpu(rec->r_clusters), le32_to_cpu(rec->r_refcount));
1791
1792 rf_list->rl_recs[index] = *rec;
1793
1794 le16_add_cpu(&rf_list->rl_used, 1);
1795
1796 if (merge)
1797 ocfs2_refcount_rec_merge(rb, index);
1798
1799 ocfs2_journal_dirty(handle, ref_leaf_bh);
1800
1801 if (index == 0) {
1802 ret = ocfs2_adjust_refcount_rec(handle, ci,
1803 ref_root_bh,
1804 ref_leaf_bh, rec);
1805 if (ret)
1806 mlog_errno(ret);
1807 }
1808out:
1809 brelse(new_bh);
1810 return ret;
1811}
1812
1813/*
1814 * Split the refcount_rec indexed by "index" in ref_leaf_bh.
1815 * This is much simple than our b-tree code.
1816 * split_rec is the new refcount rec we want to insert.
1817 * If split_rec->r_refcount > 0, we are changing the refcount(in case we
1818 * increase refcount or decrease a refcount to non-zero).
1819 * If split_rec->r_refcount == 0, we are punching a hole in current refcount
1820 * rec( in case we decrease a refcount to zero).
1821 */
1822static int ocfs2_split_refcount_rec(handle_t *handle,
1823 struct ocfs2_caching_info *ci,
1824 struct buffer_head *ref_root_bh,
1825 struct buffer_head *ref_leaf_bh,
1826 struct ocfs2_refcount_rec *split_rec,
1827 int index, int merge,
1828 struct ocfs2_alloc_context *meta_ac,
1829 struct ocfs2_cached_dealloc_ctxt *dealloc)
1830{
1831 int ret, recs_need;
1832 u32 len;
1833 struct ocfs2_refcount_block *rb =
1834 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
1835 struct ocfs2_refcount_list *rf_list = &rb->rf_records;
1836 struct ocfs2_refcount_rec *orig_rec = &rf_list->rl_recs[index];
1837 struct ocfs2_refcount_rec *tail_rec = NULL;
1838 struct buffer_head *new_bh = NULL;
1839
1840 BUG_ON(le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL);
1841
1842 trace_ocfs2_split_refcount_rec(le64_to_cpu(orig_rec->r_cpos),
1843 le32_to_cpu(orig_rec->r_clusters),
1844 le32_to_cpu(orig_rec->r_refcount),
1845 le64_to_cpu(split_rec->r_cpos),
1846 le32_to_cpu(split_rec->r_clusters),
1847 le32_to_cpu(split_rec->r_refcount));
1848
1849 /*
1850 * If we just need to split the header or tail clusters,
1851 * no more recs are needed, just split is OK.
1852 * Otherwise we at least need one new recs.
1853 */
1854 if (!split_rec->r_refcount &&
1855 (split_rec->r_cpos == orig_rec->r_cpos ||
1856 le64_to_cpu(split_rec->r_cpos) +
1857 le32_to_cpu(split_rec->r_clusters) ==
1858 le64_to_cpu(orig_rec->r_cpos) + le32_to_cpu(orig_rec->r_clusters)))
1859 recs_need = 0;
1860 else
1861 recs_need = 1;
1862
1863 /*
1864 * We need one more rec if we split in the middle and the new rec have
1865 * some refcount in it.
1866 */
1867 if (split_rec->r_refcount &&
1868 (split_rec->r_cpos != orig_rec->r_cpos &&
1869 le64_to_cpu(split_rec->r_cpos) +
1870 le32_to_cpu(split_rec->r_clusters) !=
1871 le64_to_cpu(orig_rec->r_cpos) + le32_to_cpu(orig_rec->r_clusters)))
1872 recs_need++;
1873
1874 /* If the leaf block don't have enough record, expand it. */
1875 if (le16_to_cpu(rf_list->rl_used) + recs_need >
1876 le16_to_cpu(rf_list->rl_count)) {
1877 struct ocfs2_refcount_rec tmp_rec;
1878 u64 cpos = le64_to_cpu(orig_rec->r_cpos);
1879 len = le32_to_cpu(orig_rec->r_clusters);
1880 ret = ocfs2_expand_refcount_tree(handle, ci, ref_root_bh,
1881 ref_leaf_bh, meta_ac);
1882 if (ret) {
1883 mlog_errno(ret);
1884 goto out;
1885 }
1886
1887 /*
1888 * We have to re-get it since now cpos may be moved to
1889 * another leaf block.
1890 */
1891 ret = ocfs2_get_refcount_rec(ci, ref_root_bh,
1892 cpos, len, &tmp_rec, &index,
1893 &new_bh);
1894 if (ret) {
1895 mlog_errno(ret);
1896 goto out;
1897 }
1898
1899 ref_leaf_bh = new_bh;
1900 rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
1901 rf_list = &rb->rf_records;
1902 orig_rec = &rf_list->rl_recs[index];
1903 }
1904
1905 ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh,
1906 OCFS2_JOURNAL_ACCESS_WRITE);
1907 if (ret) {
1908 mlog_errno(ret);
1909 goto out;
1910 }
1911
1912 /*
1913 * We have calculated out how many new records we need and store
1914 * in recs_need, so spare enough space first by moving the records
1915 * after "index" to the end.
1916 */
1917 if (index != le16_to_cpu(rf_list->rl_used) - 1)
1918 memmove(&rf_list->rl_recs[index + 1 + recs_need],
1919 &rf_list->rl_recs[index + 1],
1920 (le16_to_cpu(rf_list->rl_used) - index - 1) *
1921 sizeof(struct ocfs2_refcount_rec));
1922
1923 len = (le64_to_cpu(orig_rec->r_cpos) +
1924 le32_to_cpu(orig_rec->r_clusters)) -
1925 (le64_to_cpu(split_rec->r_cpos) +
1926 le32_to_cpu(split_rec->r_clusters));
1927
1928 /*
1929 * If we have "len", the we will split in the tail and move it
1930 * to the end of the space we have just spared.
1931 */
1932 if (len) {
1933 tail_rec = &rf_list->rl_recs[index + recs_need];
1934
1935 memcpy(tail_rec, orig_rec, sizeof(struct ocfs2_refcount_rec));
1936 le64_add_cpu(&tail_rec->r_cpos,
1937 le32_to_cpu(tail_rec->r_clusters) - len);
1938 tail_rec->r_clusters = cpu_to_le32(len);
1939 }
1940
1941 /*
1942 * If the split pos isn't the same as the original one, we need to
1943 * split in the head.
1944 *
1945 * Note: We have the chance that split_rec.r_refcount = 0,
1946 * recs_need = 0 and len > 0, which means we just cut the head from
1947 * the orig_rec and in that case we have done some modification in
1948 * orig_rec above, so the check for r_cpos is faked.
1949 */
1950 if (split_rec->r_cpos != orig_rec->r_cpos && tail_rec != orig_rec) {
1951 len = le64_to_cpu(split_rec->r_cpos) -
1952 le64_to_cpu(orig_rec->r_cpos);
1953 orig_rec->r_clusters = cpu_to_le32(len);
1954 index++;
1955 }
1956
1957 le16_add_cpu(&rf_list->rl_used, recs_need);
1958
1959 if (split_rec->r_refcount) {
1960 rf_list->rl_recs[index] = *split_rec;
1961 trace_ocfs2_split_refcount_rec_insert(
1962 (unsigned long long)ref_leaf_bh->b_blocknr, index,
1963 (unsigned long long)le64_to_cpu(split_rec->r_cpos),
1964 le32_to_cpu(split_rec->r_clusters),
1965 le32_to_cpu(split_rec->r_refcount));
1966
1967 if (merge)
1968 ocfs2_refcount_rec_merge(rb, index);
1969 }
1970
1971 ocfs2_journal_dirty(handle, ref_leaf_bh);
1972
1973out:
1974 brelse(new_bh);
1975 return ret;
1976}
1977
1978static int __ocfs2_increase_refcount(handle_t *handle,
1979 struct ocfs2_caching_info *ci,
1980 struct buffer_head *ref_root_bh,
1981 u64 cpos, u32 len, int merge,
1982 struct ocfs2_alloc_context *meta_ac,
1983 struct ocfs2_cached_dealloc_ctxt *dealloc)
1984{
1985 int ret = 0, index;
1986 struct buffer_head *ref_leaf_bh = NULL;
1987 struct ocfs2_refcount_rec rec;
1988 unsigned int set_len = 0;
1989
1990 trace_ocfs2_increase_refcount_begin(
1991 (unsigned long long)ocfs2_metadata_cache_owner(ci),
1992 (unsigned long long)cpos, len);
1993
1994 while (len) {
1995 ret = ocfs2_get_refcount_rec(ci, ref_root_bh,
1996 cpos, len, &rec, &index,
1997 &ref_leaf_bh);
1998 if (ret) {
1999 mlog_errno(ret);
2000 goto out;
2001 }
2002
2003 set_len = le32_to_cpu(rec.r_clusters);
2004
2005 /*
2006 * Here we may meet with 3 situations:
2007 *
2008 * 1. If we find an already existing record, and the length
2009 * is the same, cool, we just need to increase the r_refcount
2010 * and it is OK.
2011 * 2. If we find a hole, just insert it with r_refcount = 1.
2012 * 3. If we are in the middle of one extent record, split
2013 * it.
2014 */
2015 if (rec.r_refcount && le64_to_cpu(rec.r_cpos) == cpos &&
2016 set_len <= len) {
2017 trace_ocfs2_increase_refcount_change(
2018 (unsigned long long)cpos, set_len,
2019 le32_to_cpu(rec.r_refcount));
2020 ret = ocfs2_change_refcount_rec(handle, ci,
2021 ref_leaf_bh, index,
2022 merge, 1);
2023 if (ret) {
2024 mlog_errno(ret);
2025 goto out;
2026 }
2027 } else if (!rec.r_refcount) {
2028 rec.r_refcount = cpu_to_le32(1);
2029
2030 trace_ocfs2_increase_refcount_insert(
2031 (unsigned long long)le64_to_cpu(rec.r_cpos),
2032 set_len);
2033 ret = ocfs2_insert_refcount_rec(handle, ci, ref_root_bh,
2034 ref_leaf_bh,
2035 &rec, index,
2036 merge, meta_ac);
2037 if (ret) {
2038 mlog_errno(ret);
2039 goto out;
2040 }
2041 } else {
2042 set_len = min((u64)(cpos + len),
2043 le64_to_cpu(rec.r_cpos) + set_len) - cpos;
2044 rec.r_cpos = cpu_to_le64(cpos);
2045 rec.r_clusters = cpu_to_le32(set_len);
2046 le32_add_cpu(&rec.r_refcount, 1);
2047
2048 trace_ocfs2_increase_refcount_split(
2049 (unsigned long long)le64_to_cpu(rec.r_cpos),
2050 set_len, le32_to_cpu(rec.r_refcount));
2051 ret = ocfs2_split_refcount_rec(handle, ci,
2052 ref_root_bh, ref_leaf_bh,
2053 &rec, index, merge,
2054 meta_ac, dealloc);
2055 if (ret) {
2056 mlog_errno(ret);
2057 goto out;
2058 }
2059 }
2060
2061 cpos += set_len;
2062 len -= set_len;
2063 brelse(ref_leaf_bh);
2064 ref_leaf_bh = NULL;
2065 }
2066
2067out:
2068 brelse(ref_leaf_bh);
2069 return ret;
2070}
2071
2072static int ocfs2_remove_refcount_extent(handle_t *handle,
2073 struct ocfs2_caching_info *ci,
2074 struct buffer_head *ref_root_bh,
2075 struct buffer_head *ref_leaf_bh,
2076 struct ocfs2_alloc_context *meta_ac,
2077 struct ocfs2_cached_dealloc_ctxt *dealloc)
2078{
2079 int ret;
2080 struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
2081 struct ocfs2_refcount_block *rb =
2082 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
2083 struct ocfs2_extent_tree et;
2084
2085 BUG_ON(rb->rf_records.rl_used);
2086
2087 trace_ocfs2_remove_refcount_extent(
2088 (unsigned long long)ocfs2_metadata_cache_owner(ci),
2089 (unsigned long long)ref_leaf_bh->b_blocknr,
2090 le32_to_cpu(rb->rf_cpos));
2091
2092 ocfs2_init_refcount_extent_tree(&et, ci, ref_root_bh);
2093 ret = ocfs2_remove_extent(handle, &et, le32_to_cpu(rb->rf_cpos),
2094 1, meta_ac, dealloc);
2095 if (ret) {
2096 mlog_errno(ret);
2097 goto out;
2098 }
2099
2100 ocfs2_remove_from_cache(ci, ref_leaf_bh);
2101
2102 /*
2103 * add the freed block to the dealloc so that it will be freed
2104 * when we run dealloc.
2105 */
2106 ret = ocfs2_cache_block_dealloc(dealloc, EXTENT_ALLOC_SYSTEM_INODE,
2107 le16_to_cpu(rb->rf_suballoc_slot),
2108 le64_to_cpu(rb->rf_suballoc_loc),
2109 le64_to_cpu(rb->rf_blkno),
2110 le16_to_cpu(rb->rf_suballoc_bit));
2111 if (ret) {
2112 mlog_errno(ret);
2113 goto out;
2114 }
2115
2116 ret = ocfs2_journal_access_rb(handle, ci, ref_root_bh,
2117 OCFS2_JOURNAL_ACCESS_WRITE);
2118 if (ret) {
2119 mlog_errno(ret);
2120 goto out;
2121 }
2122
2123 rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
2124
2125 le32_add_cpu(&rb->rf_clusters, -1);
2126
2127 /*
2128 * check whether we need to restore the root refcount block if
2129 * there is no leaf extent block at atll.
2130 */
2131 if (!rb->rf_list.l_next_free_rec) {
2132 BUG_ON(rb->rf_clusters);
2133
2134 trace_ocfs2_restore_refcount_block(
2135 (unsigned long long)ref_root_bh->b_blocknr);
2136
2137 rb->rf_flags = 0;
2138 rb->rf_parent = 0;
2139 rb->rf_cpos = 0;
2140 memset(&rb->rf_records, 0, sb->s_blocksize -
2141 offsetof(struct ocfs2_refcount_block, rf_records));
2142 rb->rf_records.rl_count =
2143 cpu_to_le16(ocfs2_refcount_recs_per_rb(sb));
2144 }
2145
2146 ocfs2_journal_dirty(handle, ref_root_bh);
2147
2148out:
2149 return ret;
2150}
2151
2152int ocfs2_increase_refcount(handle_t *handle,
2153 struct ocfs2_caching_info *ci,
2154 struct buffer_head *ref_root_bh,
2155 u64 cpos, u32 len,
2156 struct ocfs2_alloc_context *meta_ac,
2157 struct ocfs2_cached_dealloc_ctxt *dealloc)
2158{
2159 return __ocfs2_increase_refcount(handle, ci, ref_root_bh,
2160 cpos, len, 1,
2161 meta_ac, dealloc);
2162}
2163
2164static int ocfs2_decrease_refcount_rec(handle_t *handle,
2165 struct ocfs2_caching_info *ci,
2166 struct buffer_head *ref_root_bh,
2167 struct buffer_head *ref_leaf_bh,
2168 int index, u64 cpos, unsigned int len,
2169 struct ocfs2_alloc_context *meta_ac,
2170 struct ocfs2_cached_dealloc_ctxt *dealloc)
2171{
2172 int ret;
2173 struct ocfs2_refcount_block *rb =
2174 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
2175 struct ocfs2_refcount_rec *rec = &rb->rf_records.rl_recs[index];
2176
2177 BUG_ON(cpos < le64_to_cpu(rec->r_cpos));
2178 BUG_ON(cpos + len >
2179 le64_to_cpu(rec->r_cpos) + le32_to_cpu(rec->r_clusters));
2180
2181 trace_ocfs2_decrease_refcount_rec(
2182 (unsigned long long)ocfs2_metadata_cache_owner(ci),
2183 (unsigned long long)cpos, len);
2184
2185 if (cpos == le64_to_cpu(rec->r_cpos) &&
2186 len == le32_to_cpu(rec->r_clusters))
2187 ret = ocfs2_change_refcount_rec(handle, ci,
2188 ref_leaf_bh, index, 1, -1);
2189 else {
2190 struct ocfs2_refcount_rec split = *rec;
2191 split.r_cpos = cpu_to_le64(cpos);
2192 split.r_clusters = cpu_to_le32(len);
2193
2194 le32_add_cpu(&split.r_refcount, -1);
2195
2196 ret = ocfs2_split_refcount_rec(handle, ci,
2197 ref_root_bh, ref_leaf_bh,
2198 &split, index, 1,
2199 meta_ac, dealloc);
2200 }
2201
2202 if (ret) {
2203 mlog_errno(ret);
2204 goto out;
2205 }
2206
2207 /* Remove the leaf refcount block if it contains no refcount record. */
2208 if (!rb->rf_records.rl_used && ref_leaf_bh != ref_root_bh) {
2209 ret = ocfs2_remove_refcount_extent(handle, ci, ref_root_bh,
2210 ref_leaf_bh, meta_ac,
2211 dealloc);
2212 if (ret)
2213 mlog_errno(ret);
2214 }
2215
2216out:
2217 return ret;
2218}
2219
2220static int __ocfs2_decrease_refcount(handle_t *handle,
2221 struct ocfs2_caching_info *ci,
2222 struct buffer_head *ref_root_bh,
2223 u64 cpos, u32 len,
2224 struct ocfs2_alloc_context *meta_ac,
2225 struct ocfs2_cached_dealloc_ctxt *dealloc,
2226 int delete)
2227{
2228 int ret = 0, index = 0;
2229 struct ocfs2_refcount_rec rec;
2230 unsigned int r_count = 0, r_len;
2231 struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
2232 struct buffer_head *ref_leaf_bh = NULL;
2233
2234 trace_ocfs2_decrease_refcount(
2235 (unsigned long long)ocfs2_metadata_cache_owner(ci),
2236 (unsigned long long)cpos, len, delete);
2237
2238 while (len) {
2239 ret = ocfs2_get_refcount_rec(ci, ref_root_bh,
2240 cpos, len, &rec, &index,
2241 &ref_leaf_bh);
2242 if (ret) {
2243 mlog_errno(ret);
2244 goto out;
2245 }
2246
2247 r_count = le32_to_cpu(rec.r_refcount);
2248 BUG_ON(r_count == 0);
2249 if (!delete)
2250 BUG_ON(r_count > 1);
2251
2252 r_len = min((u64)(cpos + len), le64_to_cpu(rec.r_cpos) +
2253 le32_to_cpu(rec.r_clusters)) - cpos;
2254
2255 ret = ocfs2_decrease_refcount_rec(handle, ci, ref_root_bh,
2256 ref_leaf_bh, index,
2257 cpos, r_len,
2258 meta_ac, dealloc);
2259 if (ret) {
2260 mlog_errno(ret);
2261 goto out;
2262 }
2263
2264 if (le32_to_cpu(rec.r_refcount) == 1 && delete) {
2265 ret = ocfs2_cache_cluster_dealloc(dealloc,
2266 ocfs2_clusters_to_blocks(sb, cpos),
2267 r_len);
2268 if (ret) {
2269 mlog_errno(ret);
2270 goto out;
2271 }
2272 }
2273
2274 cpos += r_len;
2275 len -= r_len;
2276 brelse(ref_leaf_bh);
2277 ref_leaf_bh = NULL;
2278 }
2279
2280out:
2281 brelse(ref_leaf_bh);
2282 return ret;
2283}
2284
2285/* Caller must hold refcount tree lock. */
2286int ocfs2_decrease_refcount(struct inode *inode,
2287 handle_t *handle, u32 cpos, u32 len,
2288 struct ocfs2_alloc_context *meta_ac,
2289 struct ocfs2_cached_dealloc_ctxt *dealloc,
2290 int delete)
2291{
2292 int ret;
2293 u64 ref_blkno;
2294 struct buffer_head *ref_root_bh = NULL;
2295 struct ocfs2_refcount_tree *tree;
2296
2297 BUG_ON(!ocfs2_is_refcount_inode(inode));
2298
2299 ret = ocfs2_get_refcount_block(inode, &ref_blkno);
2300 if (ret) {
2301 mlog_errno(ret);
2302 goto out;
2303 }
2304
2305 ret = ocfs2_get_refcount_tree(OCFS2_SB(inode->i_sb), ref_blkno, &tree);
2306 if (ret) {
2307 mlog_errno(ret);
2308 goto out;
2309 }
2310
2311 ret = ocfs2_read_refcount_block(&tree->rf_ci, tree->rf_blkno,
2312 &ref_root_bh);
2313 if (ret) {
2314 mlog_errno(ret);
2315 goto out;
2316 }
2317
2318 ret = __ocfs2_decrease_refcount(handle, &tree->rf_ci, ref_root_bh,
2319 cpos, len, meta_ac, dealloc, delete);
2320 if (ret)
2321 mlog_errno(ret);
2322out:
2323 brelse(ref_root_bh);
2324 return ret;
2325}
2326
2327/*
2328 * Mark the already-existing extent at cpos as refcounted for len clusters.
2329 * This adds the refcount extent flag.
2330 *
2331 * If the existing extent is larger than the request, initiate a
2332 * split. An attempt will be made at merging with adjacent extents.
2333 *
2334 * The caller is responsible for passing down meta_ac if we'll need it.
2335 */
2336static int ocfs2_mark_extent_refcounted(struct inode *inode,
2337 struct ocfs2_extent_tree *et,
2338 handle_t *handle, u32 cpos,
2339 u32 len, u32 phys,
2340 struct ocfs2_alloc_context *meta_ac,
2341 struct ocfs2_cached_dealloc_ctxt *dealloc)
2342{
2343 int ret;
2344
2345 trace_ocfs2_mark_extent_refcounted(OCFS2_I(inode)->ip_blkno,
2346 cpos, len, phys);
2347
2348 if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb))) {
2349 ret = ocfs2_error(inode->i_sb, "Inode %lu want to use refcount tree, but the feature bit is not set in the super block\n",
2350 inode->i_ino);
2351 goto out;
2352 }
2353
2354 ret = ocfs2_change_extent_flag(handle, et, cpos,
2355 len, phys, meta_ac, dealloc,
2356 OCFS2_EXT_REFCOUNTED, 0);
2357 if (ret)
2358 mlog_errno(ret);
2359
2360out:
2361 return ret;
2362}
2363
2364/*
2365 * Given some contiguous physical clusters, calculate what we need
2366 * for modifying their refcount.
2367 */
2368static int ocfs2_calc_refcount_meta_credits(struct super_block *sb,
2369 struct ocfs2_caching_info *ci,
2370 struct buffer_head *ref_root_bh,
2371 u64 start_cpos,
2372 u32 clusters,
2373 int *meta_add,
2374 int *credits)
2375{
2376 int ret = 0, index, ref_blocks = 0, recs_add = 0;
2377 u64 cpos = start_cpos;
2378 struct ocfs2_refcount_block *rb;
2379 struct ocfs2_refcount_rec rec;
2380 struct buffer_head *ref_leaf_bh = NULL, *prev_bh = NULL;
2381 u32 len;
2382
2383 while (clusters) {
2384 ret = ocfs2_get_refcount_rec(ci, ref_root_bh,
2385 cpos, clusters, &rec,
2386 &index, &ref_leaf_bh);
2387 if (ret) {
2388 mlog_errno(ret);
2389 goto out;
2390 }
2391
2392 if (ref_leaf_bh != prev_bh) {
2393 /*
2394 * Now we encounter a new leaf block, so calculate
2395 * whether we need to extend the old leaf.
2396 */
2397 if (prev_bh) {
2398 rb = (struct ocfs2_refcount_block *)
2399 prev_bh->b_data;
2400
2401 if (le16_to_cpu(rb->rf_records.rl_used) +
2402 recs_add >
2403 le16_to_cpu(rb->rf_records.rl_count))
2404 ref_blocks++;
2405 }
2406
2407 recs_add = 0;
2408 *credits += 1;
2409 brelse(prev_bh);
2410 prev_bh = ref_leaf_bh;
2411 get_bh(prev_bh);
2412 }
2413
2414 trace_ocfs2_calc_refcount_meta_credits_iterate(
2415 recs_add, (unsigned long long)cpos, clusters,
2416 (unsigned long long)le64_to_cpu(rec.r_cpos),
2417 le32_to_cpu(rec.r_clusters),
2418 le32_to_cpu(rec.r_refcount), index);
2419
2420 len = min((u64)cpos + clusters, le64_to_cpu(rec.r_cpos) +
2421 le32_to_cpu(rec.r_clusters)) - cpos;
2422 /*
2423 * We record all the records which will be inserted to the
2424 * same refcount block, so that we can tell exactly whether
2425 * we need a new refcount block or not.
2426 *
2427 * If we will insert a new one, this is easy and only happens
2428 * during adding refcounted flag to the extent, so we don't
2429 * have a chance of spliting. We just need one record.
2430 *
2431 * If the refcount rec already exists, that would be a little
2432 * complicated. we may have to:
2433 * 1) split at the beginning if the start pos isn't aligned.
2434 * we need 1 more record in this case.
2435 * 2) split int the end if the end pos isn't aligned.
2436 * we need 1 more record in this case.
2437 * 3) split in the middle because of file system fragmentation.
2438 * we need 2 more records in this case(we can't detect this
2439 * beforehand, so always think of the worst case).
2440 */
2441 if (rec.r_refcount) {
2442 recs_add += 2;
2443 /* Check whether we need a split at the beginning. */
2444 if (cpos == start_cpos &&
2445 cpos != le64_to_cpu(rec.r_cpos))
2446 recs_add++;
2447
2448 /* Check whether we need a split in the end. */
2449 if (cpos + clusters < le64_to_cpu(rec.r_cpos) +
2450 le32_to_cpu(rec.r_clusters))
2451 recs_add++;
2452 } else
2453 recs_add++;
2454
2455 brelse(ref_leaf_bh);
2456 ref_leaf_bh = NULL;
2457 clusters -= len;
2458 cpos += len;
2459 }
2460
2461 if (prev_bh) {
2462 rb = (struct ocfs2_refcount_block *)prev_bh->b_data;
2463
2464 if (le16_to_cpu(rb->rf_records.rl_used) + recs_add >
2465 le16_to_cpu(rb->rf_records.rl_count))
2466 ref_blocks++;
2467
2468 *credits += 1;
2469 }
2470
2471 if (!ref_blocks)
2472 goto out;
2473
2474 *meta_add += ref_blocks;
2475 *credits += ref_blocks;
2476
2477 /*
2478 * So we may need ref_blocks to insert into the tree.
2479 * That also means we need to change the b-tree and add that number
2480 * of records since we never merge them.
2481 * We need one more block for expansion since the new created leaf
2482 * block is also full and needs split.
2483 */
2484 rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
2485 if (le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL) {
2486 struct ocfs2_extent_tree et;
2487
2488 ocfs2_init_refcount_extent_tree(&et, ci, ref_root_bh);
2489 *meta_add += ocfs2_extend_meta_needed(et.et_root_el);
2490 *credits += ocfs2_calc_extend_credits(sb,
2491 et.et_root_el);
2492 } else {
2493 *credits += OCFS2_EXPAND_REFCOUNT_TREE_CREDITS;
2494 *meta_add += 1;
2495 }
2496
2497out:
2498
2499 trace_ocfs2_calc_refcount_meta_credits(
2500 (unsigned long long)start_cpos, clusters,
2501 *meta_add, *credits);
2502 brelse(ref_leaf_bh);
2503 brelse(prev_bh);
2504 return ret;
2505}
2506
2507/*
2508 * For refcount tree, we will decrease some contiguous clusters
2509 * refcount count, so just go through it to see how many blocks
2510 * we gonna touch and whether we need to create new blocks.
2511 *
2512 * Normally the refcount blocks store these refcount should be
2513 * contiguous also, so that we can get the number easily.
2514 * We will at most add split 2 refcount records and 2 more
2515 * refcount blocks, so just check it in a rough way.
2516 *
2517 * Caller must hold refcount tree lock.
2518 */
2519int ocfs2_prepare_refcount_change_for_del(struct inode *inode,
2520 u64 refcount_loc,
2521 u64 phys_blkno,
2522 u32 clusters,
2523 int *credits,
2524 int *ref_blocks)
2525{
2526 int ret;
2527 struct buffer_head *ref_root_bh = NULL;
2528 struct ocfs2_refcount_tree *tree;
2529 u64 start_cpos = ocfs2_blocks_to_clusters(inode->i_sb, phys_blkno);
2530
2531 if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb))) {
2532 ret = ocfs2_error(inode->i_sb, "Inode %lu want to use refcount tree, but the feature bit is not set in the super block\n",
2533 inode->i_ino);
2534 goto out;
2535 }
2536
2537 BUG_ON(!ocfs2_is_refcount_inode(inode));
2538
2539 ret = ocfs2_get_refcount_tree(OCFS2_SB(inode->i_sb),
2540 refcount_loc, &tree);
2541 if (ret) {
2542 mlog_errno(ret);
2543 goto out;
2544 }
2545
2546 ret = ocfs2_read_refcount_block(&tree->rf_ci, refcount_loc,
2547 &ref_root_bh);
2548 if (ret) {
2549 mlog_errno(ret);
2550 goto out;
2551 }
2552
2553 ret = ocfs2_calc_refcount_meta_credits(inode->i_sb,
2554 &tree->rf_ci,
2555 ref_root_bh,
2556 start_cpos, clusters,
2557 ref_blocks, credits);
2558 if (ret) {
2559 mlog_errno(ret);
2560 goto out;
2561 }
2562
2563 trace_ocfs2_prepare_refcount_change_for_del(*ref_blocks, *credits);
2564
2565out:
2566 brelse(ref_root_bh);
2567 return ret;
2568}
2569
2570#define MAX_CONTIG_BYTES 1048576
2571
2572static inline unsigned int ocfs2_cow_contig_clusters(struct super_block *sb)
2573{
2574 return ocfs2_clusters_for_bytes(sb, MAX_CONTIG_BYTES);
2575}
2576
2577static inline unsigned int ocfs2_cow_contig_mask(struct super_block *sb)
2578{
2579 return ~(ocfs2_cow_contig_clusters(sb) - 1);
2580}
2581
2582/*
2583 * Given an extent that starts at 'start' and an I/O that starts at 'cpos',
2584 * find an offset (start + (n * contig_clusters)) that is closest to cpos
2585 * while still being less than or equal to it.
2586 *
2587 * The goal is to break the extent at a multiple of contig_clusters.
2588 */
2589static inline unsigned int ocfs2_cow_align_start(struct super_block *sb,
2590 unsigned int start,
2591 unsigned int cpos)
2592{
2593 BUG_ON(start > cpos);
2594
2595 return start + ((cpos - start) & ocfs2_cow_contig_mask(sb));
2596}
2597
2598/*
2599 * Given a cluster count of len, pad it out so that it is a multiple
2600 * of contig_clusters.
2601 */
2602static inline unsigned int ocfs2_cow_align_length(struct super_block *sb,
2603 unsigned int len)
2604{
2605 unsigned int padded =
2606 (len + (ocfs2_cow_contig_clusters(sb) - 1)) &
2607 ocfs2_cow_contig_mask(sb);
2608
2609 /* Did we wrap? */
2610 if (padded < len)
2611 padded = UINT_MAX;
2612
2613 return padded;
2614}
2615
2616/*
2617 * Calculate out the start and number of virtual clusters we need to to CoW.
2618 *
2619 * cpos is vitual start cluster position we want to do CoW in a
2620 * file and write_len is the cluster length.
2621 * max_cpos is the place where we want to stop CoW intentionally.
2622 *
2623 * Normal we will start CoW from the beginning of extent record cotaining cpos.
2624 * We try to break up extents on boundaries of MAX_CONTIG_BYTES so that we
2625 * get good I/O from the resulting extent tree.
2626 */
2627static int ocfs2_refcount_cal_cow_clusters(struct inode *inode,
2628 struct ocfs2_extent_list *el,
2629 u32 cpos,
2630 u32 write_len,
2631 u32 max_cpos,
2632 u32 *cow_start,
2633 u32 *cow_len)
2634{
2635 int ret = 0;
2636 int tree_height = le16_to_cpu(el->l_tree_depth), i;
2637 struct buffer_head *eb_bh = NULL;
2638 struct ocfs2_extent_block *eb = NULL;
2639 struct ocfs2_extent_rec *rec;
2640 unsigned int want_clusters, rec_end = 0;
2641 int contig_clusters = ocfs2_cow_contig_clusters(inode->i_sb);
2642 int leaf_clusters;
2643
2644 BUG_ON(cpos + write_len > max_cpos);
2645
2646 if (tree_height > 0) {
2647 ret = ocfs2_find_leaf(INODE_CACHE(inode), el, cpos, &eb_bh);
2648 if (ret) {
2649 mlog_errno(ret);
2650 goto out;
2651 }
2652
2653 eb = (struct ocfs2_extent_block *) eb_bh->b_data;
2654 el = &eb->h_list;
2655
2656 if (el->l_tree_depth) {
2657 ret = ocfs2_error(inode->i_sb,
2658 "Inode %lu has non zero tree depth in leaf block %llu\n",
2659 inode->i_ino,
2660 (unsigned long long)eb_bh->b_blocknr);
2661 goto out;
2662 }
2663 }
2664
2665 *cow_len = 0;
2666 for (i = 0; i < le16_to_cpu(el->l_next_free_rec); i++) {
2667 rec = &el->l_recs[i];
2668
2669 if (ocfs2_is_empty_extent(rec)) {
2670 mlog_bug_on_msg(i != 0, "Inode %lu has empty record in "
2671 "index %d\n", inode->i_ino, i);
2672 continue;
2673 }
2674
2675 if (le32_to_cpu(rec->e_cpos) +
2676 le16_to_cpu(rec->e_leaf_clusters) <= cpos)
2677 continue;
2678
2679 if (*cow_len == 0) {
2680 /*
2681 * We should find a refcounted record in the
2682 * first pass.
2683 */
2684 BUG_ON(!(rec->e_flags & OCFS2_EXT_REFCOUNTED));
2685 *cow_start = le32_to_cpu(rec->e_cpos);
2686 }
2687
2688 /*
2689 * If we encounter a hole, a non-refcounted record or
2690 * pass the max_cpos, stop the search.
2691 */
2692 if ((!(rec->e_flags & OCFS2_EXT_REFCOUNTED)) ||
2693 (*cow_len && rec_end != le32_to_cpu(rec->e_cpos)) ||
2694 (max_cpos <= le32_to_cpu(rec->e_cpos)))
2695 break;
2696
2697 leaf_clusters = le16_to_cpu(rec->e_leaf_clusters);
2698 rec_end = le32_to_cpu(rec->e_cpos) + leaf_clusters;
2699 if (rec_end > max_cpos) {
2700 rec_end = max_cpos;
2701 leaf_clusters = rec_end - le32_to_cpu(rec->e_cpos);
2702 }
2703
2704 /*
2705 * How many clusters do we actually need from
2706 * this extent? First we see how many we actually
2707 * need to complete the write. If that's smaller
2708 * than contig_clusters, we try for contig_clusters.
2709 */
2710 if (!*cow_len)
2711 want_clusters = write_len;
2712 else
2713 want_clusters = (cpos + write_len) -
2714 (*cow_start + *cow_len);
2715 if (want_clusters < contig_clusters)
2716 want_clusters = contig_clusters;
2717
2718 /*
2719 * If the write does not cover the whole extent, we
2720 * need to calculate how we're going to split the extent.
2721 * We try to do it on contig_clusters boundaries.
2722 *
2723 * Any extent smaller than contig_clusters will be
2724 * CoWed in its entirety.
2725 */
2726 if (leaf_clusters <= contig_clusters)
2727 *cow_len += leaf_clusters;
2728 else if (*cow_len || (*cow_start == cpos)) {
2729 /*
2730 * This extent needs to be CoW'd from its
2731 * beginning, so all we have to do is compute
2732 * how many clusters to grab. We align
2733 * want_clusters to the edge of contig_clusters
2734 * to get better I/O.
2735 */
2736 want_clusters = ocfs2_cow_align_length(inode->i_sb,
2737 want_clusters);
2738
2739 if (leaf_clusters < want_clusters)
2740 *cow_len += leaf_clusters;
2741 else
2742 *cow_len += want_clusters;
2743 } else if ((*cow_start + contig_clusters) >=
2744 (cpos + write_len)) {
2745 /*
2746 * Breaking off contig_clusters at the front
2747 * of the extent will cover our write. That's
2748 * easy.
2749 */
2750 *cow_len = contig_clusters;
2751 } else if ((rec_end - cpos) <= contig_clusters) {
2752 /*
2753 * Breaking off contig_clusters at the tail of
2754 * this extent will cover cpos.
2755 */
2756 *cow_start = rec_end - contig_clusters;
2757 *cow_len = contig_clusters;
2758 } else if ((rec_end - cpos) <= want_clusters) {
2759 /*
2760 * While we can't fit the entire write in this
2761 * extent, we know that the write goes from cpos
2762 * to the end of the extent. Break that off.
2763 * We try to break it at some multiple of
2764 * contig_clusters from the front of the extent.
2765 * Failing that (ie, cpos is within
2766 * contig_clusters of the front), we'll CoW the
2767 * entire extent.
2768 */
2769 *cow_start = ocfs2_cow_align_start(inode->i_sb,
2770 *cow_start, cpos);
2771 *cow_len = rec_end - *cow_start;
2772 } else {
2773 /*
2774 * Ok, the entire write lives in the middle of
2775 * this extent. Let's try to slice the extent up
2776 * nicely. Optimally, our CoW region starts at
2777 * m*contig_clusters from the beginning of the
2778 * extent and goes for n*contig_clusters,
2779 * covering the entire write.
2780 */
2781 *cow_start = ocfs2_cow_align_start(inode->i_sb,
2782 *cow_start, cpos);
2783
2784 want_clusters = (cpos + write_len) - *cow_start;
2785 want_clusters = ocfs2_cow_align_length(inode->i_sb,
2786 want_clusters);
2787 if (*cow_start + want_clusters <= rec_end)
2788 *cow_len = want_clusters;
2789 else
2790 *cow_len = rec_end - *cow_start;
2791 }
2792
2793 /* Have we covered our entire write yet? */
2794 if ((*cow_start + *cow_len) >= (cpos + write_len))
2795 break;
2796
2797 /*
2798 * If we reach the end of the extent block and don't get enough
2799 * clusters, continue with the next extent block if possible.
2800 */
2801 if (i + 1 == le16_to_cpu(el->l_next_free_rec) &&
2802 eb && eb->h_next_leaf_blk) {
2803 brelse(eb_bh);
2804 eb_bh = NULL;
2805
2806 ret = ocfs2_read_extent_block(INODE_CACHE(inode),
2807 le64_to_cpu(eb->h_next_leaf_blk),
2808 &eb_bh);
2809 if (ret) {
2810 mlog_errno(ret);
2811 goto out;
2812 }
2813
2814 eb = (struct ocfs2_extent_block *) eb_bh->b_data;
2815 el = &eb->h_list;
2816 i = -1;
2817 }
2818 }
2819
2820out:
2821 brelse(eb_bh);
2822 return ret;
2823}
2824
2825/*
2826 * Prepare meta_ac, data_ac and calculate credits when we want to add some
2827 * num_clusters in data_tree "et" and change the refcount for the old
2828 * clusters(starting form p_cluster) in the refcount tree.
2829 *
2830 * Note:
2831 * 1. since we may split the old tree, so we at most will need num_clusters + 2
2832 * more new leaf records.
2833 * 2. In some case, we may not need to reserve new clusters(e.g, reflink), so
2834 * just give data_ac = NULL.
2835 */
2836static int ocfs2_lock_refcount_allocators(struct super_block *sb,
2837 u32 p_cluster, u32 num_clusters,
2838 struct ocfs2_extent_tree *et,
2839 struct ocfs2_caching_info *ref_ci,
2840 struct buffer_head *ref_root_bh,
2841 struct ocfs2_alloc_context **meta_ac,
2842 struct ocfs2_alloc_context **data_ac,
2843 int *credits)
2844{
2845 int ret = 0, meta_add = 0;
2846 int num_free_extents = ocfs2_num_free_extents(et);
2847
2848 if (num_free_extents < 0) {
2849 ret = num_free_extents;
2850 mlog_errno(ret);
2851 goto out;
2852 }
2853
2854 if (num_free_extents < num_clusters + 2)
2855 meta_add =
2856 ocfs2_extend_meta_needed(et->et_root_el);
2857
2858 *credits += ocfs2_calc_extend_credits(sb, et->et_root_el);
2859
2860 ret = ocfs2_calc_refcount_meta_credits(sb, ref_ci, ref_root_bh,
2861 p_cluster, num_clusters,
2862 &meta_add, credits);
2863 if (ret) {
2864 mlog_errno(ret);
2865 goto out;
2866 }
2867
2868 trace_ocfs2_lock_refcount_allocators(meta_add, *credits);
2869 ret = ocfs2_reserve_new_metadata_blocks(OCFS2_SB(sb), meta_add,
2870 meta_ac);
2871 if (ret) {
2872 mlog_errno(ret);
2873 goto out;
2874 }
2875
2876 if (data_ac) {
2877 ret = ocfs2_reserve_clusters(OCFS2_SB(sb), num_clusters,
2878 data_ac);
2879 if (ret)
2880 mlog_errno(ret);
2881 }
2882
2883out:
2884 if (ret) {
2885 if (*meta_ac) {
2886 ocfs2_free_alloc_context(*meta_ac);
2887 *meta_ac = NULL;
2888 }
2889 }
2890
2891 return ret;
2892}
2893
2894static int ocfs2_clear_cow_buffer(handle_t *handle, struct buffer_head *bh)
2895{
2896 BUG_ON(buffer_dirty(bh));
2897
2898 clear_buffer_mapped(bh);
2899
2900 return 0;
2901}
2902
2903int ocfs2_duplicate_clusters_by_page(handle_t *handle,
2904 struct inode *inode,
2905 u32 cpos, u32 old_cluster,
2906 u32 new_cluster, u32 new_len)
2907{
2908 int ret = 0, partial;
2909 struct super_block *sb = inode->i_sb;
2910 u64 new_block = ocfs2_clusters_to_blocks(sb, new_cluster);
2911 struct page *page;
2912 pgoff_t page_index;
2913 unsigned int from, to;
2914 loff_t offset, end, map_end;
2915 struct address_space *mapping = inode->i_mapping;
2916
2917 trace_ocfs2_duplicate_clusters_by_page(cpos, old_cluster,
2918 new_cluster, new_len);
2919
2920 offset = ((loff_t)cpos) << OCFS2_SB(sb)->s_clustersize_bits;
2921 end = offset + (new_len << OCFS2_SB(sb)->s_clustersize_bits);
2922 /*
2923 * We only duplicate pages until we reach the page contains i_size - 1.
2924 * So trim 'end' to i_size.
2925 */
2926 if (end > i_size_read(inode))
2927 end = i_size_read(inode);
2928
2929 while (offset < end) {
2930 page_index = offset >> PAGE_SHIFT;
2931 map_end = ((loff_t)page_index + 1) << PAGE_SHIFT;
2932 if (map_end > end)
2933 map_end = end;
2934
2935 /* from, to is the offset within the page. */
2936 from = offset & (PAGE_SIZE - 1);
2937 to = PAGE_SIZE;
2938 if (map_end & (PAGE_SIZE - 1))
2939 to = map_end & (PAGE_SIZE - 1);
2940
2941retry:
2942 page = find_or_create_page(mapping, page_index, GFP_NOFS);
2943 if (!page) {
2944 ret = -ENOMEM;
2945 mlog_errno(ret);
2946 break;
2947 }
2948
2949 /*
2950 * In case PAGE_SIZE <= CLUSTER_SIZE, we do not expect a dirty
2951 * page, so write it back.
2952 */
2953 if (PAGE_SIZE <= OCFS2_SB(sb)->s_clustersize) {
2954 if (PageDirty(page)) {
2955 /*
2956 * write_on_page will unlock the page on return
2957 */
2958 ret = write_one_page(page);
2959 goto retry;
2960 }
2961 }
2962
2963 if (!PageUptodate(page)) {
2964 ret = block_read_full_page(page, ocfs2_get_block);
2965 if (ret) {
2966 mlog_errno(ret);
2967 goto unlock;
2968 }
2969 lock_page(page);
2970 }
2971
2972 if (page_has_buffers(page)) {
2973 ret = walk_page_buffers(handle, page_buffers(page),
2974 from, to, &partial,
2975 ocfs2_clear_cow_buffer);
2976 if (ret) {
2977 mlog_errno(ret);
2978 goto unlock;
2979 }
2980 }
2981
2982 ocfs2_map_and_dirty_page(inode,
2983 handle, from, to,
2984 page, 0, &new_block);
2985 mark_page_accessed(page);
2986unlock:
2987 unlock_page(page);
2988 put_page(page);
2989 page = NULL;
2990 offset = map_end;
2991 if (ret)
2992 break;
2993 }
2994
2995 return ret;
2996}
2997
2998int ocfs2_duplicate_clusters_by_jbd(handle_t *handle,
2999 struct inode *inode,
3000 u32 cpos, u32 old_cluster,
3001 u32 new_cluster, u32 new_len)
3002{
3003 int ret = 0;
3004 struct super_block *sb = inode->i_sb;
3005 struct ocfs2_caching_info *ci = INODE_CACHE(inode);
3006 int i, blocks = ocfs2_clusters_to_blocks(sb, new_len);
3007 u64 old_block = ocfs2_clusters_to_blocks(sb, old_cluster);
3008 u64 new_block = ocfs2_clusters_to_blocks(sb, new_cluster);
3009 struct ocfs2_super *osb = OCFS2_SB(sb);
3010 struct buffer_head *old_bh = NULL;
3011 struct buffer_head *new_bh = NULL;
3012
3013 trace_ocfs2_duplicate_clusters_by_page(cpos, old_cluster,
3014 new_cluster, new_len);
3015
3016 for (i = 0; i < blocks; i++, old_block++, new_block++) {
3017 new_bh = sb_getblk(osb->sb, new_block);
3018 if (new_bh == NULL) {
3019 ret = -ENOMEM;
3020 mlog_errno(ret);
3021 break;
3022 }
3023
3024 ocfs2_set_new_buffer_uptodate(ci, new_bh);
3025
3026 ret = ocfs2_read_block(ci, old_block, &old_bh, NULL);
3027 if (ret) {
3028 mlog_errno(ret);
3029 break;
3030 }
3031
3032 ret = ocfs2_journal_access(handle, ci, new_bh,
3033 OCFS2_JOURNAL_ACCESS_CREATE);
3034 if (ret) {
3035 mlog_errno(ret);
3036 break;
3037 }
3038
3039 memcpy(new_bh->b_data, old_bh->b_data, sb->s_blocksize);
3040 ocfs2_journal_dirty(handle, new_bh);
3041
3042 brelse(new_bh);
3043 brelse(old_bh);
3044 new_bh = NULL;
3045 old_bh = NULL;
3046 }
3047
3048 brelse(new_bh);
3049 brelse(old_bh);
3050 return ret;
3051}
3052
3053static int ocfs2_clear_ext_refcount(handle_t *handle,
3054 struct ocfs2_extent_tree *et,
3055 u32 cpos, u32 p_cluster, u32 len,
3056 unsigned int ext_flags,
3057 struct ocfs2_alloc_context *meta_ac,
3058 struct ocfs2_cached_dealloc_ctxt *dealloc)
3059{
3060 int ret, index;
3061 struct ocfs2_extent_rec replace_rec;
3062 struct ocfs2_path *path = NULL;
3063 struct ocfs2_extent_list *el;
3064 struct super_block *sb = ocfs2_metadata_cache_get_super(et->et_ci);
3065 u64 ino = ocfs2_metadata_cache_owner(et->et_ci);
3066
3067 trace_ocfs2_clear_ext_refcount((unsigned long long)ino,
3068 cpos, len, p_cluster, ext_flags);
3069
3070 memset(&replace_rec, 0, sizeof(replace_rec));
3071 replace_rec.e_cpos = cpu_to_le32(cpos);
3072 replace_rec.e_leaf_clusters = cpu_to_le16(len);
3073 replace_rec.e_blkno = cpu_to_le64(ocfs2_clusters_to_blocks(sb,
3074 p_cluster));
3075 replace_rec.e_flags = ext_flags;
3076 replace_rec.e_flags &= ~OCFS2_EXT_REFCOUNTED;
3077
3078 path = ocfs2_new_path_from_et(et);
3079 if (!path) {
3080 ret = -ENOMEM;
3081 mlog_errno(ret);
3082 goto out;
3083 }
3084
3085 ret = ocfs2_find_path(et->et_ci, path, cpos);
3086 if (ret) {
3087 mlog_errno(ret);
3088 goto out;
3089 }
3090
3091 el = path_leaf_el(path);
3092
3093 index = ocfs2_search_extent_list(el, cpos);
3094 if (index == -1) {
3095 ret = ocfs2_error(sb,
3096 "Inode %llu has an extent at cpos %u which can no longer be found\n",
3097 (unsigned long long)ino, cpos);
3098 goto out;
3099 }
3100
3101 ret = ocfs2_split_extent(handle, et, path, index,
3102 &replace_rec, meta_ac, dealloc);
3103 if (ret)
3104 mlog_errno(ret);
3105
3106out:
3107 ocfs2_free_path(path);
3108 return ret;
3109}
3110
3111static int ocfs2_replace_clusters(handle_t *handle,
3112 struct ocfs2_cow_context *context,
3113 u32 cpos, u32 old,
3114 u32 new, u32 len,
3115 unsigned int ext_flags)
3116{
3117 int ret;
3118 struct ocfs2_caching_info *ci = context->data_et.et_ci;
3119 u64 ino = ocfs2_metadata_cache_owner(ci);
3120
3121 trace_ocfs2_replace_clusters((unsigned long long)ino,
3122 cpos, old, new, len, ext_flags);
3123
3124 /*If the old clusters is unwritten, no need to duplicate. */
3125 if (!(ext_flags & OCFS2_EXT_UNWRITTEN)) {
3126 ret = context->cow_duplicate_clusters(handle, context->inode,
3127 cpos, old, new, len);
3128 if (ret) {
3129 mlog_errno(ret);
3130 goto out;
3131 }
3132 }
3133
3134 ret = ocfs2_clear_ext_refcount(handle, &context->data_et,
3135 cpos, new, len, ext_flags,
3136 context->meta_ac, &context->dealloc);
3137 if (ret)
3138 mlog_errno(ret);
3139out:
3140 return ret;
3141}
3142
3143int ocfs2_cow_sync_writeback(struct super_block *sb,
3144 struct inode *inode,
3145 u32 cpos, u32 num_clusters)
3146{
3147 int ret = 0;
3148 loff_t offset, end, map_end;
3149 pgoff_t page_index;
3150 struct page *page;
3151
3152 if (ocfs2_should_order_data(inode))
3153 return 0;
3154
3155 offset = ((loff_t)cpos) << OCFS2_SB(sb)->s_clustersize_bits;
3156 end = offset + (num_clusters << OCFS2_SB(sb)->s_clustersize_bits);
3157
3158 ret = filemap_fdatawrite_range(inode->i_mapping,
3159 offset, end - 1);
3160 if (ret < 0) {
3161 mlog_errno(ret);
3162 return ret;
3163 }
3164
3165 while (offset < end) {
3166 page_index = offset >> PAGE_SHIFT;
3167 map_end = ((loff_t)page_index + 1) << PAGE_SHIFT;
3168 if (map_end > end)
3169 map_end = end;
3170
3171 page = find_or_create_page(inode->i_mapping,
3172 page_index, GFP_NOFS);
3173 BUG_ON(!page);
3174
3175 wait_on_page_writeback(page);
3176 if (PageError(page)) {
3177 ret = -EIO;
3178 mlog_errno(ret);
3179 } else
3180 mark_page_accessed(page);
3181
3182 unlock_page(page);
3183 put_page(page);
3184 page = NULL;
3185 offset = map_end;
3186 if (ret)
3187 break;
3188 }
3189
3190 return ret;
3191}
3192
3193static int ocfs2_di_get_clusters(struct ocfs2_cow_context *context,
3194 u32 v_cluster, u32 *p_cluster,
3195 u32 *num_clusters,
3196 unsigned int *extent_flags)
3197{
3198 return ocfs2_get_clusters(context->inode, v_cluster, p_cluster,
3199 num_clusters, extent_flags);
3200}
3201
3202static int ocfs2_make_clusters_writable(struct super_block *sb,
3203 struct ocfs2_cow_context *context,
3204 u32 cpos, u32 p_cluster,
3205 u32 num_clusters, unsigned int e_flags)
3206{
3207 int ret, delete, index, credits = 0;
3208 u32 new_bit, new_len, orig_num_clusters;
3209 unsigned int set_len;
3210 struct ocfs2_super *osb = OCFS2_SB(sb);
3211 handle_t *handle;
3212 struct buffer_head *ref_leaf_bh = NULL;
3213 struct ocfs2_caching_info *ref_ci = &context->ref_tree->rf_ci;
3214 struct ocfs2_refcount_rec rec;
3215
3216 trace_ocfs2_make_clusters_writable(cpos, p_cluster,
3217 num_clusters, e_flags);
3218
3219 ret = ocfs2_lock_refcount_allocators(sb, p_cluster, num_clusters,
3220 &context->data_et,
3221 ref_ci,
3222 context->ref_root_bh,
3223 &context->meta_ac,
3224 &context->data_ac, &credits);
3225 if (ret) {
3226 mlog_errno(ret);
3227 return ret;
3228 }
3229
3230 if (context->post_refcount)
3231 credits += context->post_refcount->credits;
3232
3233 credits += context->extra_credits;
3234 handle = ocfs2_start_trans(osb, credits);
3235 if (IS_ERR(handle)) {
3236 ret = PTR_ERR(handle);
3237 mlog_errno(ret);
3238 goto out;
3239 }
3240
3241 orig_num_clusters = num_clusters;
3242
3243 while (num_clusters) {
3244 ret = ocfs2_get_refcount_rec(ref_ci, context->ref_root_bh,
3245 p_cluster, num_clusters,
3246 &rec, &index, &ref_leaf_bh);
3247 if (ret) {
3248 mlog_errno(ret);
3249 goto out_commit;
3250 }
3251
3252 BUG_ON(!rec.r_refcount);
3253 set_len = min((u64)p_cluster + num_clusters,
3254 le64_to_cpu(rec.r_cpos) +
3255 le32_to_cpu(rec.r_clusters)) - p_cluster;
3256
3257 /*
3258 * There are many different situation here.
3259 * 1. If refcount == 1, remove the flag and don't COW.
3260 * 2. If refcount > 1, allocate clusters.
3261 * Here we may not allocate r_len once at a time, so continue
3262 * until we reach num_clusters.
3263 */
3264 if (le32_to_cpu(rec.r_refcount) == 1) {
3265 delete = 0;
3266 ret = ocfs2_clear_ext_refcount(handle,
3267 &context->data_et,
3268 cpos, p_cluster,
3269 set_len, e_flags,
3270 context->meta_ac,
3271 &context->dealloc);
3272 if (ret) {
3273 mlog_errno(ret);
3274 goto out_commit;
3275 }
3276 } else {
3277 delete = 1;
3278
3279 ret = __ocfs2_claim_clusters(handle,
3280 context->data_ac,
3281 1, set_len,
3282 &new_bit, &new_len);
3283 if (ret) {
3284 mlog_errno(ret);
3285 goto out_commit;
3286 }
3287
3288 ret = ocfs2_replace_clusters(handle, context,
3289 cpos, p_cluster, new_bit,
3290 new_len, e_flags);
3291 if (ret) {
3292 mlog_errno(ret);
3293 goto out_commit;
3294 }
3295 set_len = new_len;
3296 }
3297
3298 ret = __ocfs2_decrease_refcount(handle, ref_ci,
3299 context->ref_root_bh,
3300 p_cluster, set_len,
3301 context->meta_ac,
3302 &context->dealloc, delete);
3303 if (ret) {
3304 mlog_errno(ret);
3305 goto out_commit;
3306 }
3307
3308 cpos += set_len;
3309 p_cluster += set_len;
3310 num_clusters -= set_len;
3311 brelse(ref_leaf_bh);
3312 ref_leaf_bh = NULL;
3313 }
3314
3315 /* handle any post_cow action. */
3316 if (context->post_refcount && context->post_refcount->func) {
3317 ret = context->post_refcount->func(context->inode, handle,
3318 context->post_refcount->para);
3319 if (ret) {
3320 mlog_errno(ret);
3321 goto out_commit;
3322 }
3323 }
3324
3325 /*
3326 * Here we should write the new page out first if we are
3327 * in write-back mode.
3328 */
3329 if (context->get_clusters == ocfs2_di_get_clusters) {
3330 ret = ocfs2_cow_sync_writeback(sb, context->inode, cpos,
3331 orig_num_clusters);
3332 if (ret)
3333 mlog_errno(ret);
3334 }
3335
3336out_commit:
3337 ocfs2_commit_trans(osb, handle);
3338
3339out:
3340 if (context->data_ac) {
3341 ocfs2_free_alloc_context(context->data_ac);
3342 context->data_ac = NULL;
3343 }
3344 if (context->meta_ac) {
3345 ocfs2_free_alloc_context(context->meta_ac);
3346 context->meta_ac = NULL;
3347 }
3348 brelse(ref_leaf_bh);
3349
3350 return ret;
3351}
3352
3353static int ocfs2_replace_cow(struct ocfs2_cow_context *context)
3354{
3355 int ret = 0;
3356 struct inode *inode = context->inode;
3357 u32 cow_start = context->cow_start, cow_len = context->cow_len;
3358 u32 p_cluster, num_clusters;
3359 unsigned int ext_flags;
3360 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3361
3362 if (!ocfs2_refcount_tree(osb)) {
3363 return ocfs2_error(inode->i_sb, "Inode %lu want to use refcount tree, but the feature bit is not set in the super block\n",
3364 inode->i_ino);
3365 }
3366
3367 ocfs2_init_dealloc_ctxt(&context->dealloc);
3368
3369 while (cow_len) {
3370 ret = context->get_clusters(context, cow_start, &p_cluster,
3371 &num_clusters, &ext_flags);
3372 if (ret) {
3373 mlog_errno(ret);
3374 break;
3375 }
3376
3377 BUG_ON(!(ext_flags & OCFS2_EXT_REFCOUNTED));
3378
3379 if (cow_len < num_clusters)
3380 num_clusters = cow_len;
3381
3382 ret = ocfs2_make_clusters_writable(inode->i_sb, context,
3383 cow_start, p_cluster,
3384 num_clusters, ext_flags);
3385 if (ret) {
3386 mlog_errno(ret);
3387 break;
3388 }
3389
3390 cow_len -= num_clusters;
3391 cow_start += num_clusters;
3392 }
3393
3394 if (ocfs2_dealloc_has_cluster(&context->dealloc)) {
3395 ocfs2_schedule_truncate_log_flush(osb, 1);
3396 ocfs2_run_deallocs(osb, &context->dealloc);
3397 }
3398
3399 return ret;
3400}
3401
3402/*
3403 * Starting at cpos, try to CoW write_len clusters. Don't CoW
3404 * past max_cpos. This will stop when it runs into a hole or an
3405 * unrefcounted extent.
3406 */
3407static int ocfs2_refcount_cow_hunk(struct inode *inode,
3408 struct buffer_head *di_bh,
3409 u32 cpos, u32 write_len, u32 max_cpos)
3410{
3411 int ret;
3412 u32 cow_start = 0, cow_len = 0;
3413 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3414 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
3415 struct buffer_head *ref_root_bh = NULL;
3416 struct ocfs2_refcount_tree *ref_tree;
3417 struct ocfs2_cow_context *context = NULL;
3418
3419 BUG_ON(!ocfs2_is_refcount_inode(inode));
3420
3421 ret = ocfs2_refcount_cal_cow_clusters(inode, &di->id2.i_list,
3422 cpos, write_len, max_cpos,
3423 &cow_start, &cow_len);
3424 if (ret) {
3425 mlog_errno(ret);
3426 goto out;
3427 }
3428
3429 trace_ocfs2_refcount_cow_hunk(OCFS2_I(inode)->ip_blkno,
3430 cpos, write_len, max_cpos,
3431 cow_start, cow_len);
3432
3433 BUG_ON(cow_len == 0);
3434
3435 context = kzalloc(sizeof(struct ocfs2_cow_context), GFP_NOFS);
3436 if (!context) {
3437 ret = -ENOMEM;
3438 mlog_errno(ret);
3439 goto out;
3440 }
3441
3442 ret = ocfs2_lock_refcount_tree(osb, le64_to_cpu(di->i_refcount_loc),
3443 1, &ref_tree, &ref_root_bh);
3444 if (ret) {
3445 mlog_errno(ret);
3446 goto out;
3447 }
3448
3449 context->inode = inode;
3450 context->cow_start = cow_start;
3451 context->cow_len = cow_len;
3452 context->ref_tree = ref_tree;
3453 context->ref_root_bh = ref_root_bh;
3454 context->cow_duplicate_clusters = ocfs2_duplicate_clusters_by_page;
3455 context->get_clusters = ocfs2_di_get_clusters;
3456
3457 ocfs2_init_dinode_extent_tree(&context->data_et,
3458 INODE_CACHE(inode), di_bh);
3459
3460 ret = ocfs2_replace_cow(context);
3461 if (ret)
3462 mlog_errno(ret);
3463
3464 /*
3465 * truncate the extent map here since no matter whether we meet with
3466 * any error during the action, we shouldn't trust cached extent map
3467 * any more.
3468 */
3469 ocfs2_extent_map_trunc(inode, cow_start);
3470
3471 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
3472 brelse(ref_root_bh);
3473out:
3474 kfree(context);
3475 return ret;
3476}
3477
3478/*
3479 * CoW any and all clusters between cpos and cpos+write_len.
3480 * Don't CoW past max_cpos. If this returns successfully, all
3481 * clusters between cpos and cpos+write_len are safe to modify.
3482 */
3483int ocfs2_refcount_cow(struct inode *inode,
3484 struct buffer_head *di_bh,
3485 u32 cpos, u32 write_len, u32 max_cpos)
3486{
3487 int ret = 0;
3488 u32 p_cluster, num_clusters;
3489 unsigned int ext_flags;
3490
3491 while (write_len) {
3492 ret = ocfs2_get_clusters(inode, cpos, &p_cluster,
3493 &num_clusters, &ext_flags);
3494 if (ret) {
3495 mlog_errno(ret);
3496 break;
3497 }
3498
3499 if (write_len < num_clusters)
3500 num_clusters = write_len;
3501
3502 if (ext_flags & OCFS2_EXT_REFCOUNTED) {
3503 ret = ocfs2_refcount_cow_hunk(inode, di_bh, cpos,
3504 num_clusters, max_cpos);
3505 if (ret) {
3506 mlog_errno(ret);
3507 break;
3508 }
3509 }
3510
3511 write_len -= num_clusters;
3512 cpos += num_clusters;
3513 }
3514
3515 return ret;
3516}
3517
3518static int ocfs2_xattr_value_get_clusters(struct ocfs2_cow_context *context,
3519 u32 v_cluster, u32 *p_cluster,
3520 u32 *num_clusters,
3521 unsigned int *extent_flags)
3522{
3523 struct inode *inode = context->inode;
3524 struct ocfs2_xattr_value_root *xv = context->cow_object;
3525
3526 return ocfs2_xattr_get_clusters(inode, v_cluster, p_cluster,
3527 num_clusters, &xv->xr_list,
3528 extent_flags);
3529}
3530
3531/*
3532 * Given a xattr value root, calculate the most meta/credits we need for
3533 * refcount tree change if we truncate it to 0.
3534 */
3535int ocfs2_refcounted_xattr_delete_need(struct inode *inode,
3536 struct ocfs2_caching_info *ref_ci,
3537 struct buffer_head *ref_root_bh,
3538 struct ocfs2_xattr_value_root *xv,
3539 int *meta_add, int *credits)
3540{
3541 int ret = 0, index, ref_blocks = 0;
3542 u32 p_cluster, num_clusters;
3543 u32 cpos = 0, clusters = le32_to_cpu(xv->xr_clusters);
3544 struct ocfs2_refcount_block *rb;
3545 struct ocfs2_refcount_rec rec;
3546 struct buffer_head *ref_leaf_bh = NULL;
3547
3548 while (cpos < clusters) {
3549 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
3550 &num_clusters, &xv->xr_list,
3551 NULL);
3552 if (ret) {
3553 mlog_errno(ret);
3554 goto out;
3555 }
3556
3557 cpos += num_clusters;
3558
3559 while (num_clusters) {
3560 ret = ocfs2_get_refcount_rec(ref_ci, ref_root_bh,
3561 p_cluster, num_clusters,
3562 &rec, &index,
3563 &ref_leaf_bh);
3564 if (ret) {
3565 mlog_errno(ret);
3566 goto out;
3567 }
3568
3569 BUG_ON(!rec.r_refcount);
3570
3571 rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
3572
3573 /*
3574 * We really don't know whether the other clusters is in
3575 * this refcount block or not, so just take the worst
3576 * case that all the clusters are in this block and each
3577 * one will split a refcount rec, so totally we need
3578 * clusters * 2 new refcount rec.
3579 */
3580 if (le16_to_cpu(rb->rf_records.rl_used) + clusters * 2 >
3581 le16_to_cpu(rb->rf_records.rl_count))
3582 ref_blocks++;
3583
3584 *credits += 1;
3585 brelse(ref_leaf_bh);
3586 ref_leaf_bh = NULL;
3587
3588 if (num_clusters <= le32_to_cpu(rec.r_clusters))
3589 break;
3590 else
3591 num_clusters -= le32_to_cpu(rec.r_clusters);
3592 p_cluster += num_clusters;
3593 }
3594 }
3595
3596 *meta_add += ref_blocks;
3597 if (!ref_blocks)
3598 goto out;
3599
3600 rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
3601 if (le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL)
3602 *credits += OCFS2_EXPAND_REFCOUNT_TREE_CREDITS;
3603 else {
3604 struct ocfs2_extent_tree et;
3605
3606 ocfs2_init_refcount_extent_tree(&et, ref_ci, ref_root_bh);
3607 *credits += ocfs2_calc_extend_credits(inode->i_sb,
3608 et.et_root_el);
3609 }
3610
3611out:
3612 brelse(ref_leaf_bh);
3613 return ret;
3614}
3615
3616/*
3617 * Do CoW for xattr.
3618 */
3619int ocfs2_refcount_cow_xattr(struct inode *inode,
3620 struct ocfs2_dinode *di,
3621 struct ocfs2_xattr_value_buf *vb,
3622 struct ocfs2_refcount_tree *ref_tree,
3623 struct buffer_head *ref_root_bh,
3624 u32 cpos, u32 write_len,
3625 struct ocfs2_post_refcount *post)
3626{
3627 int ret;
3628 struct ocfs2_xattr_value_root *xv = vb->vb_xv;
3629 struct ocfs2_cow_context *context = NULL;
3630 u32 cow_start, cow_len;
3631
3632 BUG_ON(!ocfs2_is_refcount_inode(inode));
3633
3634 ret = ocfs2_refcount_cal_cow_clusters(inode, &xv->xr_list,
3635 cpos, write_len, UINT_MAX,
3636 &cow_start, &cow_len);
3637 if (ret) {
3638 mlog_errno(ret);
3639 goto out;
3640 }
3641
3642 BUG_ON(cow_len == 0);
3643
3644 context = kzalloc(sizeof(struct ocfs2_cow_context), GFP_NOFS);
3645 if (!context) {
3646 ret = -ENOMEM;
3647 mlog_errno(ret);
3648 goto out;
3649 }
3650
3651 context->inode = inode;
3652 context->cow_start = cow_start;
3653 context->cow_len = cow_len;
3654 context->ref_tree = ref_tree;
3655 context->ref_root_bh = ref_root_bh;
3656 context->cow_object = xv;
3657
3658 context->cow_duplicate_clusters = ocfs2_duplicate_clusters_by_jbd;
3659 /* We need the extra credits for duplicate_clusters by jbd. */
3660 context->extra_credits =
3661 ocfs2_clusters_to_blocks(inode->i_sb, 1) * cow_len;
3662 context->get_clusters = ocfs2_xattr_value_get_clusters;
3663 context->post_refcount = post;
3664
3665 ocfs2_init_xattr_value_extent_tree(&context->data_et,
3666 INODE_CACHE(inode), vb);
3667
3668 ret = ocfs2_replace_cow(context);
3669 if (ret)
3670 mlog_errno(ret);
3671
3672out:
3673 kfree(context);
3674 return ret;
3675}
3676
3677/*
3678 * Insert a new extent into refcount tree and mark a extent rec
3679 * as refcounted in the dinode tree.
3680 */
3681int ocfs2_add_refcount_flag(struct inode *inode,
3682 struct ocfs2_extent_tree *data_et,
3683 struct ocfs2_caching_info *ref_ci,
3684 struct buffer_head *ref_root_bh,
3685 u32 cpos, u32 p_cluster, u32 num_clusters,
3686 struct ocfs2_cached_dealloc_ctxt *dealloc,
3687 struct ocfs2_post_refcount *post)
3688{
3689 int ret;
3690 handle_t *handle;
3691 int credits = 1, ref_blocks = 0;
3692 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3693 struct ocfs2_alloc_context *meta_ac = NULL;
3694
3695 /* We need to be able to handle at least an extent tree split. */
3696 ref_blocks = ocfs2_extend_meta_needed(data_et->et_root_el);
3697
3698 ret = ocfs2_calc_refcount_meta_credits(inode->i_sb,
3699 ref_ci, ref_root_bh,
3700 p_cluster, num_clusters,
3701 &ref_blocks, &credits);
3702 if (ret) {
3703 mlog_errno(ret);
3704 goto out;
3705 }
3706
3707 trace_ocfs2_add_refcount_flag(ref_blocks, credits);
3708
3709 if (ref_blocks) {
3710 ret = ocfs2_reserve_new_metadata_blocks(osb,
3711 ref_blocks, &meta_ac);
3712 if (ret) {
3713 mlog_errno(ret);
3714 goto out;
3715 }
3716 }
3717
3718 if (post)
3719 credits += post->credits;
3720
3721 handle = ocfs2_start_trans(osb, credits);
3722 if (IS_ERR(handle)) {
3723 ret = PTR_ERR(handle);
3724 mlog_errno(ret);
3725 goto out;
3726 }
3727
3728 ret = ocfs2_mark_extent_refcounted(inode, data_et, handle,
3729 cpos, num_clusters, p_cluster,
3730 meta_ac, dealloc);
3731 if (ret) {
3732 mlog_errno(ret);
3733 goto out_commit;
3734 }
3735
3736 ret = __ocfs2_increase_refcount(handle, ref_ci, ref_root_bh,
3737 p_cluster, num_clusters, 0,
3738 meta_ac, dealloc);
3739 if (ret) {
3740 mlog_errno(ret);
3741 goto out_commit;
3742 }
3743
3744 if (post && post->func) {
3745 ret = post->func(inode, handle, post->para);
3746 if (ret)
3747 mlog_errno(ret);
3748 }
3749
3750out_commit:
3751 ocfs2_commit_trans(osb, handle);
3752out:
3753 if (meta_ac)
3754 ocfs2_free_alloc_context(meta_ac);
3755 return ret;
3756}
3757
3758static int ocfs2_change_ctime(struct inode *inode,
3759 struct buffer_head *di_bh)
3760{
3761 int ret;
3762 handle_t *handle;
3763 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
3764
3765 handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb),
3766 OCFS2_INODE_UPDATE_CREDITS);
3767 if (IS_ERR(handle)) {
3768 ret = PTR_ERR(handle);
3769 mlog_errno(ret);
3770 goto out;
3771 }
3772
3773 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
3774 OCFS2_JOURNAL_ACCESS_WRITE);
3775 if (ret) {
3776 mlog_errno(ret);
3777 goto out_commit;
3778 }
3779
3780 inode->i_ctime = current_time(inode);
3781 di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
3782 di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
3783
3784 ocfs2_journal_dirty(handle, di_bh);
3785
3786out_commit:
3787 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
3788out:
3789 return ret;
3790}
3791
3792static int ocfs2_attach_refcount_tree(struct inode *inode,
3793 struct buffer_head *di_bh)
3794{
3795 int ret, data_changed = 0;
3796 struct buffer_head *ref_root_bh = NULL;
3797 struct ocfs2_inode_info *oi = OCFS2_I(inode);
3798 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
3799 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3800 struct ocfs2_refcount_tree *ref_tree;
3801 unsigned int ext_flags;
3802 loff_t size;
3803 u32 cpos, num_clusters, clusters, p_cluster;
3804 struct ocfs2_cached_dealloc_ctxt dealloc;
3805 struct ocfs2_extent_tree di_et;
3806
3807 ocfs2_init_dealloc_ctxt(&dealloc);
3808
3809 if (!ocfs2_is_refcount_inode(inode)) {
3810 ret = ocfs2_create_refcount_tree(inode, di_bh);
3811 if (ret) {
3812 mlog_errno(ret);
3813 goto out;
3814 }
3815 }
3816
3817 BUG_ON(!di->i_refcount_loc);
3818 ret = ocfs2_lock_refcount_tree(osb,
3819 le64_to_cpu(di->i_refcount_loc), 1,
3820 &ref_tree, &ref_root_bh);
3821 if (ret) {
3822 mlog_errno(ret);
3823 goto out;
3824 }
3825
3826 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL)
3827 goto attach_xattr;
3828
3829 ocfs2_init_dinode_extent_tree(&di_et, INODE_CACHE(inode), di_bh);
3830
3831 size = i_size_read(inode);
3832 clusters = ocfs2_clusters_for_bytes(inode->i_sb, size);
3833
3834 cpos = 0;
3835 while (cpos < clusters) {
3836 ret = ocfs2_get_clusters(inode, cpos, &p_cluster,
3837 &num_clusters, &ext_flags);
3838 if (ret) {
3839 mlog_errno(ret);
3840 goto unlock;
3841 }
3842 if (p_cluster && !(ext_flags & OCFS2_EXT_REFCOUNTED)) {
3843 ret = ocfs2_add_refcount_flag(inode, &di_et,
3844 &ref_tree->rf_ci,
3845 ref_root_bh, cpos,
3846 p_cluster, num_clusters,
3847 &dealloc, NULL);
3848 if (ret) {
3849 mlog_errno(ret);
3850 goto unlock;
3851 }
3852
3853 data_changed = 1;
3854 }
3855 cpos += num_clusters;
3856 }
3857
3858attach_xattr:
3859 if (oi->ip_dyn_features & OCFS2_HAS_XATTR_FL) {
3860 ret = ocfs2_xattr_attach_refcount_tree(inode, di_bh,
3861 &ref_tree->rf_ci,
3862 ref_root_bh,
3863 &dealloc);
3864 if (ret) {
3865 mlog_errno(ret);
3866 goto unlock;
3867 }
3868 }
3869
3870 if (data_changed) {
3871 ret = ocfs2_change_ctime(inode, di_bh);
3872 if (ret)
3873 mlog_errno(ret);
3874 }
3875
3876unlock:
3877 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
3878 brelse(ref_root_bh);
3879
3880 if (!ret && ocfs2_dealloc_has_cluster(&dealloc)) {
3881 ocfs2_schedule_truncate_log_flush(osb, 1);
3882 ocfs2_run_deallocs(osb, &dealloc);
3883 }
3884out:
3885 /*
3886 * Empty the extent map so that we may get the right extent
3887 * record from the disk.
3888 */
3889 ocfs2_extent_map_trunc(inode, 0);
3890
3891 return ret;
3892}
3893
3894static int ocfs2_add_refcounted_extent(struct inode *inode,
3895 struct ocfs2_extent_tree *et,
3896 struct ocfs2_caching_info *ref_ci,
3897 struct buffer_head *ref_root_bh,
3898 u32 cpos, u32 p_cluster, u32 num_clusters,
3899 unsigned int ext_flags,
3900 struct ocfs2_cached_dealloc_ctxt *dealloc)
3901{
3902 int ret;
3903 handle_t *handle;
3904 int credits = 0;
3905 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3906 struct ocfs2_alloc_context *meta_ac = NULL;
3907
3908 ret = ocfs2_lock_refcount_allocators(inode->i_sb,
3909 p_cluster, num_clusters,
3910 et, ref_ci,
3911 ref_root_bh, &meta_ac,
3912 NULL, &credits);
3913 if (ret) {
3914 mlog_errno(ret);
3915 goto out;
3916 }
3917
3918 handle = ocfs2_start_trans(osb, credits);
3919 if (IS_ERR(handle)) {
3920 ret = PTR_ERR(handle);
3921 mlog_errno(ret);
3922 goto out;
3923 }
3924
3925 ret = ocfs2_insert_extent(handle, et, cpos,
3926 ocfs2_clusters_to_blocks(inode->i_sb, p_cluster),
3927 num_clusters, ext_flags, meta_ac);
3928 if (ret) {
3929 mlog_errno(ret);
3930 goto out_commit;
3931 }
3932
3933 ret = ocfs2_increase_refcount(handle, ref_ci, ref_root_bh,
3934 p_cluster, num_clusters,
3935 meta_ac, dealloc);
3936 if (ret) {
3937 mlog_errno(ret);
3938 goto out_commit;
3939 }
3940
3941 ret = dquot_alloc_space_nodirty(inode,
3942 ocfs2_clusters_to_bytes(osb->sb, num_clusters));
3943 if (ret)
3944 mlog_errno(ret);
3945
3946out_commit:
3947 ocfs2_commit_trans(osb, handle);
3948out:
3949 if (meta_ac)
3950 ocfs2_free_alloc_context(meta_ac);
3951 return ret;
3952}
3953
3954static int ocfs2_duplicate_inline_data(struct inode *s_inode,
3955 struct buffer_head *s_bh,
3956 struct inode *t_inode,
3957 struct buffer_head *t_bh)
3958{
3959 int ret;
3960 handle_t *handle;
3961 struct ocfs2_super *osb = OCFS2_SB(s_inode->i_sb);
3962 struct ocfs2_dinode *s_di = (struct ocfs2_dinode *)s_bh->b_data;
3963 struct ocfs2_dinode *t_di = (struct ocfs2_dinode *)t_bh->b_data;
3964
3965 BUG_ON(!(OCFS2_I(s_inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL));
3966
3967 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
3968 if (IS_ERR(handle)) {
3969 ret = PTR_ERR(handle);
3970 mlog_errno(ret);
3971 goto out;
3972 }
3973
3974 ret = ocfs2_journal_access_di(handle, INODE_CACHE(t_inode), t_bh,
3975 OCFS2_JOURNAL_ACCESS_WRITE);
3976 if (ret) {
3977 mlog_errno(ret);
3978 goto out_commit;
3979 }
3980
3981 t_di->id2.i_data.id_count = s_di->id2.i_data.id_count;
3982 memcpy(t_di->id2.i_data.id_data, s_di->id2.i_data.id_data,
3983 le16_to_cpu(s_di->id2.i_data.id_count));
3984 spin_lock(&OCFS2_I(t_inode)->ip_lock);
3985 OCFS2_I(t_inode)->ip_dyn_features |= OCFS2_INLINE_DATA_FL;
3986 t_di->i_dyn_features = cpu_to_le16(OCFS2_I(t_inode)->ip_dyn_features);
3987 spin_unlock(&OCFS2_I(t_inode)->ip_lock);
3988
3989 ocfs2_journal_dirty(handle, t_bh);
3990
3991out_commit:
3992 ocfs2_commit_trans(osb, handle);
3993out:
3994 return ret;
3995}
3996
3997static int ocfs2_duplicate_extent_list(struct inode *s_inode,
3998 struct inode *t_inode,
3999 struct buffer_head *t_bh,
4000 struct ocfs2_caching_info *ref_ci,
4001 struct buffer_head *ref_root_bh,
4002 struct ocfs2_cached_dealloc_ctxt *dealloc)
4003{
4004 int ret = 0;
4005 u32 p_cluster, num_clusters, clusters, cpos;
4006 loff_t size;
4007 unsigned int ext_flags;
4008 struct ocfs2_extent_tree et;
4009
4010 ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(t_inode), t_bh);
4011
4012 size = i_size_read(s_inode);
4013 clusters = ocfs2_clusters_for_bytes(s_inode->i_sb, size);
4014
4015 cpos = 0;
4016 while (cpos < clusters) {
4017 ret = ocfs2_get_clusters(s_inode, cpos, &p_cluster,
4018 &num_clusters, &ext_flags);
4019 if (ret) {
4020 mlog_errno(ret);
4021 goto out;
4022 }
4023 if (p_cluster) {
4024 ret = ocfs2_add_refcounted_extent(t_inode, &et,
4025 ref_ci, ref_root_bh,
4026 cpos, p_cluster,
4027 num_clusters,
4028 ext_flags,
4029 dealloc);
4030 if (ret) {
4031 mlog_errno(ret);
4032 goto out;
4033 }
4034 }
4035
4036 cpos += num_clusters;
4037 }
4038
4039out:
4040 return ret;
4041}
4042
4043/*
4044 * change the new file's attributes to the src.
4045 *
4046 * reflink creates a snapshot of a file, that means the attributes
4047 * must be identical except for three exceptions - nlink, ino, and ctime.
4048 */
4049static int ocfs2_complete_reflink(struct inode *s_inode,
4050 struct buffer_head *s_bh,
4051 struct inode *t_inode,
4052 struct buffer_head *t_bh,
4053 bool preserve)
4054{
4055 int ret;
4056 handle_t *handle;
4057 struct ocfs2_dinode *s_di = (struct ocfs2_dinode *)s_bh->b_data;
4058 struct ocfs2_dinode *di = (struct ocfs2_dinode *)t_bh->b_data;
4059 loff_t size = i_size_read(s_inode);
4060
4061 handle = ocfs2_start_trans(OCFS2_SB(t_inode->i_sb),
4062 OCFS2_INODE_UPDATE_CREDITS);
4063 if (IS_ERR(handle)) {
4064 ret = PTR_ERR(handle);
4065 mlog_errno(ret);
4066 return ret;
4067 }
4068
4069 ret = ocfs2_journal_access_di(handle, INODE_CACHE(t_inode), t_bh,
4070 OCFS2_JOURNAL_ACCESS_WRITE);
4071 if (ret) {
4072 mlog_errno(ret);
4073 goto out_commit;
4074 }
4075
4076 spin_lock(&OCFS2_I(t_inode)->ip_lock);
4077 OCFS2_I(t_inode)->ip_clusters = OCFS2_I(s_inode)->ip_clusters;
4078 OCFS2_I(t_inode)->ip_attr = OCFS2_I(s_inode)->ip_attr;
4079 OCFS2_I(t_inode)->ip_dyn_features = OCFS2_I(s_inode)->ip_dyn_features;
4080 spin_unlock(&OCFS2_I(t_inode)->ip_lock);
4081 i_size_write(t_inode, size);
4082 t_inode->i_blocks = s_inode->i_blocks;
4083
4084 di->i_xattr_inline_size = s_di->i_xattr_inline_size;
4085 di->i_clusters = s_di->i_clusters;
4086 di->i_size = s_di->i_size;
4087 di->i_dyn_features = s_di->i_dyn_features;
4088 di->i_attr = s_di->i_attr;
4089
4090 if (preserve) {
4091 t_inode->i_uid = s_inode->i_uid;
4092 t_inode->i_gid = s_inode->i_gid;
4093 t_inode->i_mode = s_inode->i_mode;
4094 di->i_uid = s_di->i_uid;
4095 di->i_gid = s_di->i_gid;
4096 di->i_mode = s_di->i_mode;
4097
4098 /*
4099 * update time.
4100 * we want mtime to appear identical to the source and
4101 * update ctime.
4102 */
4103 t_inode->i_ctime = current_time(t_inode);
4104
4105 di->i_ctime = cpu_to_le64(t_inode->i_ctime.tv_sec);
4106 di->i_ctime_nsec = cpu_to_le32(t_inode->i_ctime.tv_nsec);
4107
4108 t_inode->i_mtime = s_inode->i_mtime;
4109 di->i_mtime = s_di->i_mtime;
4110 di->i_mtime_nsec = s_di->i_mtime_nsec;
4111 }
4112
4113 ocfs2_journal_dirty(handle, t_bh);
4114
4115out_commit:
4116 ocfs2_commit_trans(OCFS2_SB(t_inode->i_sb), handle);
4117 return ret;
4118}
4119
4120static int ocfs2_create_reflink_node(struct inode *s_inode,
4121 struct buffer_head *s_bh,
4122 struct inode *t_inode,
4123 struct buffer_head *t_bh,
4124 bool preserve)
4125{
4126 int ret;
4127 struct buffer_head *ref_root_bh = NULL;
4128 struct ocfs2_cached_dealloc_ctxt dealloc;
4129 struct ocfs2_super *osb = OCFS2_SB(s_inode->i_sb);
4130 struct ocfs2_dinode *di = (struct ocfs2_dinode *)s_bh->b_data;
4131 struct ocfs2_refcount_tree *ref_tree;
4132
4133 ocfs2_init_dealloc_ctxt(&dealloc);
4134
4135 ret = ocfs2_set_refcount_tree(t_inode, t_bh,
4136 le64_to_cpu(di->i_refcount_loc));
4137 if (ret) {
4138 mlog_errno(ret);
4139 goto out;
4140 }
4141
4142 if (OCFS2_I(s_inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
4143 ret = ocfs2_duplicate_inline_data(s_inode, s_bh,
4144 t_inode, t_bh);
4145 if (ret)
4146 mlog_errno(ret);
4147 goto out;
4148 }
4149
4150 ret = ocfs2_lock_refcount_tree(osb, le64_to_cpu(di->i_refcount_loc),
4151 1, &ref_tree, &ref_root_bh);
4152 if (ret) {
4153 mlog_errno(ret);
4154 goto out;
4155 }
4156
4157 ret = ocfs2_duplicate_extent_list(s_inode, t_inode, t_bh,
4158 &ref_tree->rf_ci, ref_root_bh,
4159 &dealloc);
4160 if (ret) {
4161 mlog_errno(ret);
4162 goto out_unlock_refcount;
4163 }
4164
4165out_unlock_refcount:
4166 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
4167 brelse(ref_root_bh);
4168out:
4169 if (ocfs2_dealloc_has_cluster(&dealloc)) {
4170 ocfs2_schedule_truncate_log_flush(osb, 1);
4171 ocfs2_run_deallocs(osb, &dealloc);
4172 }
4173
4174 return ret;
4175}
4176
4177static int __ocfs2_reflink(struct dentry *old_dentry,
4178 struct buffer_head *old_bh,
4179 struct inode *new_inode,
4180 bool preserve)
4181{
4182 int ret;
4183 struct inode *inode = d_inode(old_dentry);
4184 struct buffer_head *new_bh = NULL;
4185
4186 if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_SYSTEM_FILE) {
4187 ret = -EINVAL;
4188 mlog_errno(ret);
4189 goto out;
4190 }
4191
4192 ret = filemap_fdatawrite(inode->i_mapping);
4193 if (ret) {
4194 mlog_errno(ret);
4195 goto out;
4196 }
4197
4198 ret = ocfs2_attach_refcount_tree(inode, old_bh);
4199 if (ret) {
4200 mlog_errno(ret);
4201 goto out;
4202 }
4203
4204 inode_lock_nested(new_inode, I_MUTEX_CHILD);
4205 ret = ocfs2_inode_lock_nested(new_inode, &new_bh, 1,
4206 OI_LS_REFLINK_TARGET);
4207 if (ret) {
4208 mlog_errno(ret);
4209 goto out_unlock;
4210 }
4211
4212 ret = ocfs2_create_reflink_node(inode, old_bh,
4213 new_inode, new_bh, preserve);
4214 if (ret) {
4215 mlog_errno(ret);
4216 goto inode_unlock;
4217 }
4218
4219 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_XATTR_FL) {
4220 ret = ocfs2_reflink_xattrs(inode, old_bh,
4221 new_inode, new_bh,
4222 preserve);
4223 if (ret) {
4224 mlog_errno(ret);
4225 goto inode_unlock;
4226 }
4227 }
4228
4229 ret = ocfs2_complete_reflink(inode, old_bh,
4230 new_inode, new_bh, preserve);
4231 if (ret)
4232 mlog_errno(ret);
4233
4234inode_unlock:
4235 ocfs2_inode_unlock(new_inode, 1);
4236 brelse(new_bh);
4237out_unlock:
4238 inode_unlock(new_inode);
4239out:
4240 if (!ret) {
4241 ret = filemap_fdatawait(inode->i_mapping);
4242 if (ret)
4243 mlog_errno(ret);
4244 }
4245 return ret;
4246}
4247
4248static int ocfs2_reflink(struct dentry *old_dentry, struct inode *dir,
4249 struct dentry *new_dentry, bool preserve)
4250{
4251 int error, had_lock;
4252 struct inode *inode = d_inode(old_dentry);
4253 struct buffer_head *old_bh = NULL;
4254 struct inode *new_orphan_inode = NULL;
4255 struct ocfs2_lock_holder oh;
4256
4257 if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb)))
4258 return -EOPNOTSUPP;
4259
4260
4261 error = ocfs2_create_inode_in_orphan(dir, inode->i_mode,
4262 &new_orphan_inode);
4263 if (error) {
4264 mlog_errno(error);
4265 goto out;
4266 }
4267
4268 error = ocfs2_rw_lock(inode, 1);
4269 if (error) {
4270 mlog_errno(error);
4271 goto out;
4272 }
4273
4274 error = ocfs2_inode_lock(inode, &old_bh, 1);
4275 if (error) {
4276 mlog_errno(error);
4277 ocfs2_rw_unlock(inode, 1);
4278 goto out;
4279 }
4280
4281 down_write(&OCFS2_I(inode)->ip_xattr_sem);
4282 down_write(&OCFS2_I(inode)->ip_alloc_sem);
4283 error = __ocfs2_reflink(old_dentry, old_bh,
4284 new_orphan_inode, preserve);
4285 up_write(&OCFS2_I(inode)->ip_alloc_sem);
4286 up_write(&OCFS2_I(inode)->ip_xattr_sem);
4287
4288 ocfs2_inode_unlock(inode, 1);
4289 ocfs2_rw_unlock(inode, 1);
4290 brelse(old_bh);
4291
4292 if (error) {
4293 mlog_errno(error);
4294 goto out;
4295 }
4296
4297 had_lock = ocfs2_inode_lock_tracker(new_orphan_inode, NULL, 1,
4298 &oh);
4299 if (had_lock < 0) {
4300 error = had_lock;
4301 mlog_errno(error);
4302 goto out;
4303 }
4304
4305 /* If the security isn't preserved, we need to re-initialize them. */
4306 if (!preserve) {
4307 error = ocfs2_init_security_and_acl(dir, new_orphan_inode,
4308 &new_dentry->d_name);
4309 if (error)
4310 mlog_errno(error);
4311 }
4312 if (!error) {
4313 error = ocfs2_mv_orphaned_inode_to_new(dir, new_orphan_inode,
4314 new_dentry);
4315 if (error)
4316 mlog_errno(error);
4317 }
4318 ocfs2_inode_unlock_tracker(new_orphan_inode, 1, &oh, had_lock);
4319
4320out:
4321 if (new_orphan_inode) {
4322 /*
4323 * We need to open_unlock the inode no matter whether we
4324 * succeed or not, so that other nodes can delete it later.
4325 */
4326 ocfs2_open_unlock(new_orphan_inode);
4327 if (error)
4328 iput(new_orphan_inode);
4329 }
4330
4331 return error;
4332}
4333
4334/*
4335 * Below here are the bits used by OCFS2_IOC_REFLINK() to fake
4336 * sys_reflink(). This will go away when vfs_reflink() exists in
4337 * fs/namei.c.
4338 */
4339
4340/* copied from may_create in VFS. */
4341static inline int ocfs2_may_create(struct inode *dir, struct dentry *child)
4342{
4343 if (d_really_is_positive(child))
4344 return -EEXIST;
4345 if (IS_DEADDIR(dir))
4346 return -ENOENT;
4347 return inode_permission(&init_user_ns, dir, MAY_WRITE | MAY_EXEC);
4348}
4349
4350/**
4351 * ocfs2_vfs_reflink - Create a reference-counted link
4352 *
4353 * @old_dentry: source dentry + inode
4354 * @dir: directory to create the target
4355 * @new_dentry: target dentry
4356 * @preserve: if true, preserve all file attributes
4357 */
4358static int ocfs2_vfs_reflink(struct dentry *old_dentry, struct inode *dir,
4359 struct dentry *new_dentry, bool preserve)
4360{
4361 struct inode *inode = d_inode(old_dentry);
4362 int error;
4363
4364 if (!inode)
4365 return -ENOENT;
4366
4367 error = ocfs2_may_create(dir, new_dentry);
4368 if (error)
4369 return error;
4370
4371 if (dir->i_sb != inode->i_sb)
4372 return -EXDEV;
4373
4374 /*
4375 * A reflink to an append-only or immutable file cannot be created.
4376 */
4377 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
4378 return -EPERM;
4379
4380 /* Only regular files can be reflinked. */
4381 if (!S_ISREG(inode->i_mode))
4382 return -EPERM;
4383
4384 /*
4385 * If the caller wants to preserve ownership, they require the
4386 * rights to do so.
4387 */
4388 if (preserve) {
4389 if (!uid_eq(current_fsuid(), inode->i_uid) && !capable(CAP_CHOWN))
4390 return -EPERM;
4391 if (!in_group_p(inode->i_gid) && !capable(CAP_CHOWN))
4392 return -EPERM;
4393 }
4394
4395 /*
4396 * If the caller is modifying any aspect of the attributes, they
4397 * are not creating a snapshot. They need read permission on the
4398 * file.
4399 */
4400 if (!preserve) {
4401 error = inode_permission(&init_user_ns, inode, MAY_READ);
4402 if (error)
4403 return error;
4404 }
4405
4406 inode_lock(inode);
4407 error = dquot_initialize(dir);
4408 if (!error)
4409 error = ocfs2_reflink(old_dentry, dir, new_dentry, preserve);
4410 inode_unlock(inode);
4411 if (!error)
4412 fsnotify_create(dir, new_dentry);
4413 return error;
4414}
4415/*
4416 * Most codes are copied from sys_linkat.
4417 */
4418int ocfs2_reflink_ioctl(struct inode *inode,
4419 const char __user *oldname,
4420 const char __user *newname,
4421 bool preserve)
4422{
4423 struct dentry *new_dentry;
4424 struct path old_path, new_path;
4425 int error;
4426
4427 if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb)))
4428 return -EOPNOTSUPP;
4429
4430 error = user_path_at(AT_FDCWD, oldname, 0, &old_path);
4431 if (error) {
4432 mlog_errno(error);
4433 return error;
4434 }
4435
4436 new_dentry = user_path_create(AT_FDCWD, newname, &new_path, 0);
4437 error = PTR_ERR(new_dentry);
4438 if (IS_ERR(new_dentry)) {
4439 mlog_errno(error);
4440 goto out;
4441 }
4442
4443 error = -EXDEV;
4444 if (old_path.mnt != new_path.mnt) {
4445 mlog_errno(error);
4446 goto out_dput;
4447 }
4448
4449 error = ocfs2_vfs_reflink(old_path.dentry,
4450 d_inode(new_path.dentry),
4451 new_dentry, preserve);
4452out_dput:
4453 done_path_create(&new_path, new_dentry);
4454out:
4455 path_put(&old_path);
4456
4457 return error;
4458}
4459
4460/* Update destination inode size, if necessary. */
4461int ocfs2_reflink_update_dest(struct inode *dest,
4462 struct buffer_head *d_bh,
4463 loff_t newlen)
4464{
4465 handle_t *handle;
4466 int ret;
4467
4468 dest->i_blocks = ocfs2_inode_sector_count(dest);
4469
4470 if (newlen <= i_size_read(dest))
4471 return 0;
4472
4473 handle = ocfs2_start_trans(OCFS2_SB(dest->i_sb),
4474 OCFS2_INODE_UPDATE_CREDITS);
4475 if (IS_ERR(handle)) {
4476 ret = PTR_ERR(handle);
4477 mlog_errno(ret);
4478 return ret;
4479 }
4480
4481 /* Extend i_size if needed. */
4482 spin_lock(&OCFS2_I(dest)->ip_lock);
4483 if (newlen > i_size_read(dest))
4484 i_size_write(dest, newlen);
4485 spin_unlock(&OCFS2_I(dest)->ip_lock);
4486 dest->i_ctime = dest->i_mtime = current_time(dest);
4487
4488 ret = ocfs2_mark_inode_dirty(handle, dest, d_bh);
4489 if (ret) {
4490 mlog_errno(ret);
4491 goto out_commit;
4492 }
4493
4494out_commit:
4495 ocfs2_commit_trans(OCFS2_SB(dest->i_sb), handle);
4496 return ret;
4497}
4498
4499/* Remap the range pos_in:len in s_inode to pos_out:len in t_inode. */
4500static loff_t ocfs2_reflink_remap_extent(struct inode *s_inode,
4501 struct buffer_head *s_bh,
4502 loff_t pos_in,
4503 struct inode *t_inode,
4504 struct buffer_head *t_bh,
4505 loff_t pos_out,
4506 loff_t len,
4507 struct ocfs2_cached_dealloc_ctxt *dealloc)
4508{
4509 struct ocfs2_extent_tree s_et;
4510 struct ocfs2_extent_tree t_et;
4511 struct ocfs2_dinode *dis;
4512 struct buffer_head *ref_root_bh = NULL;
4513 struct ocfs2_refcount_tree *ref_tree;
4514 struct ocfs2_super *osb;
4515 loff_t remapped_bytes = 0;
4516 loff_t pstart, plen;
4517 u32 p_cluster, num_clusters, slast, spos, tpos, remapped_clus = 0;
4518 unsigned int ext_flags;
4519 int ret = 0;
4520
4521 osb = OCFS2_SB(s_inode->i_sb);
4522 dis = (struct ocfs2_dinode *)s_bh->b_data;
4523 ocfs2_init_dinode_extent_tree(&s_et, INODE_CACHE(s_inode), s_bh);
4524 ocfs2_init_dinode_extent_tree(&t_et, INODE_CACHE(t_inode), t_bh);
4525
4526 spos = ocfs2_bytes_to_clusters(s_inode->i_sb, pos_in);
4527 tpos = ocfs2_bytes_to_clusters(t_inode->i_sb, pos_out);
4528 slast = ocfs2_clusters_for_bytes(s_inode->i_sb, pos_in + len);
4529
4530 while (spos < slast) {
4531 if (fatal_signal_pending(current)) {
4532 ret = -EINTR;
4533 goto out;
4534 }
4535
4536 /* Look up the extent. */
4537 ret = ocfs2_get_clusters(s_inode, spos, &p_cluster,
4538 &num_clusters, &ext_flags);
4539 if (ret) {
4540 mlog_errno(ret);
4541 goto out;
4542 }
4543
4544 num_clusters = min_t(u32, num_clusters, slast - spos);
4545
4546 /* Punch out the dest range. */
4547 pstart = ocfs2_clusters_to_bytes(t_inode->i_sb, tpos);
4548 plen = ocfs2_clusters_to_bytes(t_inode->i_sb, num_clusters);
4549 ret = ocfs2_remove_inode_range(t_inode, t_bh, pstart, plen);
4550 if (ret) {
4551 mlog_errno(ret);
4552 goto out;
4553 }
4554
4555 if (p_cluster == 0)
4556 goto next_loop;
4557
4558 /* Lock the refcount btree... */
4559 ret = ocfs2_lock_refcount_tree(osb,
4560 le64_to_cpu(dis->i_refcount_loc),
4561 1, &ref_tree, &ref_root_bh);
4562 if (ret) {
4563 mlog_errno(ret);
4564 goto out;
4565 }
4566
4567 /* Mark s_inode's extent as refcounted. */
4568 if (!(ext_flags & OCFS2_EXT_REFCOUNTED)) {
4569 ret = ocfs2_add_refcount_flag(s_inode, &s_et,
4570 &ref_tree->rf_ci,
4571 ref_root_bh, spos,
4572 p_cluster, num_clusters,
4573 dealloc, NULL);
4574 if (ret) {
4575 mlog_errno(ret);
4576 goto out_unlock_refcount;
4577 }
4578 }
4579
4580 /* Map in the new extent. */
4581 ext_flags |= OCFS2_EXT_REFCOUNTED;
4582 ret = ocfs2_add_refcounted_extent(t_inode, &t_et,
4583 &ref_tree->rf_ci,
4584 ref_root_bh,
4585 tpos, p_cluster,
4586 num_clusters,
4587 ext_flags,
4588 dealloc);
4589 if (ret) {
4590 mlog_errno(ret);
4591 goto out_unlock_refcount;
4592 }
4593
4594 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
4595 brelse(ref_root_bh);
4596next_loop:
4597 spos += num_clusters;
4598 tpos += num_clusters;
4599 remapped_clus += num_clusters;
4600 }
4601
4602 goto out;
4603out_unlock_refcount:
4604 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
4605 brelse(ref_root_bh);
4606out:
4607 remapped_bytes = ocfs2_clusters_to_bytes(t_inode->i_sb, remapped_clus);
4608 remapped_bytes = min_t(loff_t, len, remapped_bytes);
4609
4610 return remapped_bytes > 0 ? remapped_bytes : ret;
4611}
4612
4613/* Set up refcount tree and remap s_inode to t_inode. */
4614loff_t ocfs2_reflink_remap_blocks(struct inode *s_inode,
4615 struct buffer_head *s_bh,
4616 loff_t pos_in,
4617 struct inode *t_inode,
4618 struct buffer_head *t_bh,
4619 loff_t pos_out,
4620 loff_t len)
4621{
4622 struct ocfs2_cached_dealloc_ctxt dealloc;
4623 struct ocfs2_super *osb;
4624 struct ocfs2_dinode *dis;
4625 struct ocfs2_dinode *dit;
4626 loff_t ret;
4627
4628 osb = OCFS2_SB(s_inode->i_sb);
4629 dis = (struct ocfs2_dinode *)s_bh->b_data;
4630 dit = (struct ocfs2_dinode *)t_bh->b_data;
4631 ocfs2_init_dealloc_ctxt(&dealloc);
4632
4633 /*
4634 * If we're reflinking the entire file and the source is inline
4635 * data, just copy the contents.
4636 */
4637 if (pos_in == pos_out && pos_in == 0 && len == i_size_read(s_inode) &&
4638 i_size_read(t_inode) <= len &&
4639 (OCFS2_I(s_inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)) {
4640 ret = ocfs2_duplicate_inline_data(s_inode, s_bh, t_inode, t_bh);
4641 if (ret)
4642 mlog_errno(ret);
4643 goto out;
4644 }
4645
4646 /*
4647 * If both inodes belong to two different refcount groups then
4648 * forget it because we don't know how (or want) to go merging
4649 * refcount trees.
4650 */
4651 ret = -EOPNOTSUPP;
4652 if (ocfs2_is_refcount_inode(s_inode) &&
4653 ocfs2_is_refcount_inode(t_inode) &&
4654 le64_to_cpu(dis->i_refcount_loc) !=
4655 le64_to_cpu(dit->i_refcount_loc))
4656 goto out;
4657
4658 /* Neither inode has a refcount tree. Add one to s_inode. */
4659 if (!ocfs2_is_refcount_inode(s_inode) &&
4660 !ocfs2_is_refcount_inode(t_inode)) {
4661 ret = ocfs2_create_refcount_tree(s_inode, s_bh);
4662 if (ret) {
4663 mlog_errno(ret);
4664 goto out;
4665 }
4666 }
4667
4668 /* Ensure that both inodes end up with the same refcount tree. */
4669 if (!ocfs2_is_refcount_inode(s_inode)) {
4670 ret = ocfs2_set_refcount_tree(s_inode, s_bh,
4671 le64_to_cpu(dit->i_refcount_loc));
4672 if (ret) {
4673 mlog_errno(ret);
4674 goto out;
4675 }
4676 }
4677 if (!ocfs2_is_refcount_inode(t_inode)) {
4678 ret = ocfs2_set_refcount_tree(t_inode, t_bh,
4679 le64_to_cpu(dis->i_refcount_loc));
4680 if (ret) {
4681 mlog_errno(ret);
4682 goto out;
4683 }
4684 }
4685
4686 /* Turn off inline data in the dest file. */
4687 if (OCFS2_I(t_inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
4688 ret = ocfs2_convert_inline_data_to_extents(t_inode, t_bh);
4689 if (ret) {
4690 mlog_errno(ret);
4691 goto out;
4692 }
4693 }
4694
4695 /* Actually remap extents now. */
4696 ret = ocfs2_reflink_remap_extent(s_inode, s_bh, pos_in, t_inode, t_bh,
4697 pos_out, len, &dealloc);
4698 if (ret < 0) {
4699 mlog_errno(ret);
4700 goto out;
4701 }
4702
4703out:
4704 if (ocfs2_dealloc_has_cluster(&dealloc)) {
4705 ocfs2_schedule_truncate_log_flush(osb, 1);
4706 ocfs2_run_deallocs(osb, &dealloc);
4707 }
4708
4709 return ret;
4710}
4711
4712/* Lock an inode and grab a bh pointing to the inode. */
4713int ocfs2_reflink_inodes_lock(struct inode *s_inode,
4714 struct buffer_head **bh_s,
4715 struct inode *t_inode,
4716 struct buffer_head **bh_t)
4717{
4718 struct inode *inode1 = s_inode;
4719 struct inode *inode2 = t_inode;
4720 struct ocfs2_inode_info *oi1;
4721 struct ocfs2_inode_info *oi2;
4722 struct buffer_head *bh1 = NULL;
4723 struct buffer_head *bh2 = NULL;
4724 bool same_inode = (s_inode == t_inode);
4725 bool need_swap = (inode1->i_ino > inode2->i_ino);
4726 int status;
4727
4728 /* First grab the VFS and rw locks. */
4729 lock_two_nondirectories(s_inode, t_inode);
4730 if (need_swap)
4731 swap(inode1, inode2);
4732
4733 status = ocfs2_rw_lock(inode1, 1);
4734 if (status) {
4735 mlog_errno(status);
4736 goto out_i1;
4737 }
4738 if (!same_inode) {
4739 status = ocfs2_rw_lock(inode2, 1);
4740 if (status) {
4741 mlog_errno(status);
4742 goto out_i2;
4743 }
4744 }
4745
4746 /* Now go for the cluster locks */
4747 oi1 = OCFS2_I(inode1);
4748 oi2 = OCFS2_I(inode2);
4749
4750 trace_ocfs2_double_lock((unsigned long long)oi1->ip_blkno,
4751 (unsigned long long)oi2->ip_blkno);
4752
4753 /* We always want to lock the one with the lower lockid first. */
4754 if (oi1->ip_blkno > oi2->ip_blkno)
4755 mlog_errno(-ENOLCK);
4756
4757 /* lock id1 */
4758 status = ocfs2_inode_lock_nested(inode1, &bh1, 1,
4759 OI_LS_REFLINK_TARGET);
4760 if (status < 0) {
4761 if (status != -ENOENT)
4762 mlog_errno(status);
4763 goto out_rw2;
4764 }
4765
4766 /* lock id2 */
4767 if (!same_inode) {
4768 status = ocfs2_inode_lock_nested(inode2, &bh2, 1,
4769 OI_LS_REFLINK_TARGET);
4770 if (status < 0) {
4771 if (status != -ENOENT)
4772 mlog_errno(status);
4773 goto out_cl1;
4774 }
4775 } else {
4776 bh2 = bh1;
4777 }
4778
4779 /*
4780 * If we swapped inode order above, we have to swap the buffer heads
4781 * before passing them back to the caller.
4782 */
4783 if (need_swap)
4784 swap(bh1, bh2);
4785 *bh_s = bh1;
4786 *bh_t = bh2;
4787
4788 trace_ocfs2_double_lock_end(
4789 (unsigned long long)oi1->ip_blkno,
4790 (unsigned long long)oi2->ip_blkno);
4791
4792 return 0;
4793
4794out_cl1:
4795 ocfs2_inode_unlock(inode1, 1);
4796 brelse(bh1);
4797out_rw2:
4798 ocfs2_rw_unlock(inode2, 1);
4799out_i2:
4800 ocfs2_rw_unlock(inode1, 1);
4801out_i1:
4802 unlock_two_nondirectories(s_inode, t_inode);
4803 return status;
4804}
4805
4806/* Unlock both inodes and release buffers. */
4807void ocfs2_reflink_inodes_unlock(struct inode *s_inode,
4808 struct buffer_head *s_bh,
4809 struct inode *t_inode,
4810 struct buffer_head *t_bh)
4811{
4812 ocfs2_inode_unlock(s_inode, 1);
4813 ocfs2_rw_unlock(s_inode, 1);
4814 brelse(s_bh);
4815 if (s_inode != t_inode) {
4816 ocfs2_inode_unlock(t_inode, 1);
4817 ocfs2_rw_unlock(t_inode, 1);
4818 brelse(t_bh);
4819 }
4820 unlock_two_nondirectories(s_inode, t_inode);
4821}