Loading...
1/* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * move_extents.c
5 *
6 * Copyright (C) 2011 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#include <linux/fs.h>
18#include <linux/types.h>
19#include <linux/mount.h>
20#include <linux/swap.h>
21
22#include <cluster/masklog.h>
23
24#include "ocfs2.h"
25#include "ocfs2_ioctl.h"
26
27#include "alloc.h"
28#include "aops.h"
29#include "dlmglue.h"
30#include "extent_map.h"
31#include "inode.h"
32#include "journal.h"
33#include "suballoc.h"
34#include "uptodate.h"
35#include "super.h"
36#include "dir.h"
37#include "buffer_head_io.h"
38#include "sysfile.h"
39#include "refcounttree.h"
40#include "move_extents.h"
41
42struct ocfs2_move_extents_context {
43 struct inode *inode;
44 struct file *file;
45 int auto_defrag;
46 int partial;
47 int credits;
48 u32 new_phys_cpos;
49 u32 clusters_moved;
50 u64 refcount_loc;
51 struct ocfs2_move_extents *range;
52 struct ocfs2_extent_tree et;
53 struct ocfs2_alloc_context *meta_ac;
54 struct ocfs2_alloc_context *data_ac;
55 struct ocfs2_cached_dealloc_ctxt dealloc;
56};
57
58static int __ocfs2_move_extent(handle_t *handle,
59 struct ocfs2_move_extents_context *context,
60 u32 cpos, u32 len, u32 p_cpos, u32 new_p_cpos,
61 int ext_flags)
62{
63 int ret = 0, index;
64 struct inode *inode = context->inode;
65 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
66 struct ocfs2_extent_rec *rec, replace_rec;
67 struct ocfs2_path *path = NULL;
68 struct ocfs2_extent_list *el;
69 u64 ino = ocfs2_metadata_cache_owner(context->et.et_ci);
70 u64 old_blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cpos);
71
72 ret = ocfs2_duplicate_clusters_by_page(handle, inode, cpos,
73 p_cpos, new_p_cpos, len);
74 if (ret) {
75 mlog_errno(ret);
76 goto out;
77 }
78
79 memset(&replace_rec, 0, sizeof(replace_rec));
80 replace_rec.e_cpos = cpu_to_le32(cpos);
81 replace_rec.e_leaf_clusters = cpu_to_le16(len);
82 replace_rec.e_blkno = cpu_to_le64(ocfs2_clusters_to_blocks(inode->i_sb,
83 new_p_cpos));
84
85 path = ocfs2_new_path_from_et(&context->et);
86 if (!path) {
87 ret = -ENOMEM;
88 mlog_errno(ret);
89 goto out;
90 }
91
92 ret = ocfs2_find_path(INODE_CACHE(inode), path, cpos);
93 if (ret) {
94 mlog_errno(ret);
95 goto out;
96 }
97
98 el = path_leaf_el(path);
99
100 index = ocfs2_search_extent_list(el, cpos);
101 if (index == -1) {
102 ret = ocfs2_error(inode->i_sb,
103 "Inode %llu has an extent at cpos %u which can no longer be found\n",
104 (unsigned long long)ino, cpos);
105 goto out;
106 }
107
108 rec = &el->l_recs[index];
109
110 BUG_ON(ext_flags != rec->e_flags);
111 /*
112 * after moving/defraging to new location, the extent is not going
113 * to be refcounted anymore.
114 */
115 replace_rec.e_flags = ext_flags & ~OCFS2_EXT_REFCOUNTED;
116
117 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode),
118 context->et.et_root_bh,
119 OCFS2_JOURNAL_ACCESS_WRITE);
120 if (ret) {
121 mlog_errno(ret);
122 goto out;
123 }
124
125 ret = ocfs2_split_extent(handle, &context->et, path, index,
126 &replace_rec, context->meta_ac,
127 &context->dealloc);
128 if (ret) {
129 mlog_errno(ret);
130 goto out;
131 }
132
133 ocfs2_journal_dirty(handle, context->et.et_root_bh);
134
135 context->new_phys_cpos = new_p_cpos;
136
137 /*
138 * need I to append truncate log for old clusters?
139 */
140 if (old_blkno) {
141 if (ext_flags & OCFS2_EXT_REFCOUNTED)
142 ret = ocfs2_decrease_refcount(inode, handle,
143 ocfs2_blocks_to_clusters(osb->sb,
144 old_blkno),
145 len, context->meta_ac,
146 &context->dealloc, 1);
147 else
148 ret = ocfs2_truncate_log_append(osb, handle,
149 old_blkno, len);
150 }
151
152 ocfs2_update_inode_fsync_trans(handle, inode, 0);
153out:
154 ocfs2_free_path(path);
155 return ret;
156}
157
158/*
159 * lock allocators, and reserving appropriate number of bits for
160 * meta blocks and data clusters.
161 *
162 * in some cases, we don't need to reserve clusters, just let data_ac
163 * be NULL.
164 */
165static int ocfs2_lock_allocators_move_extents(struct inode *inode,
166 struct ocfs2_extent_tree *et,
167 u32 clusters_to_move,
168 u32 extents_to_split,
169 struct ocfs2_alloc_context **meta_ac,
170 struct ocfs2_alloc_context **data_ac,
171 int extra_blocks,
172 int *credits)
173{
174 int ret, num_free_extents;
175 unsigned int max_recs_needed = 2 * extents_to_split + clusters_to_move;
176 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
177
178 num_free_extents = ocfs2_num_free_extents(osb, et);
179 if (num_free_extents < 0) {
180 ret = num_free_extents;
181 mlog_errno(ret);
182 goto out;
183 }
184
185 if (!num_free_extents ||
186 (ocfs2_sparse_alloc(osb) && num_free_extents < max_recs_needed))
187 extra_blocks += ocfs2_extend_meta_needed(et->et_root_el);
188
189 ret = ocfs2_reserve_new_metadata_blocks(osb, extra_blocks, meta_ac);
190 if (ret) {
191 mlog_errno(ret);
192 goto out;
193 }
194
195 if (data_ac) {
196 ret = ocfs2_reserve_clusters(osb, clusters_to_move, data_ac);
197 if (ret) {
198 mlog_errno(ret);
199 goto out;
200 }
201 }
202
203 *credits += ocfs2_calc_extend_credits(osb->sb, et->et_root_el);
204
205 mlog(0, "reserve metadata_blocks: %d, data_clusters: %u, credits: %d\n",
206 extra_blocks, clusters_to_move, *credits);
207out:
208 if (ret) {
209 if (*meta_ac) {
210 ocfs2_free_alloc_context(*meta_ac);
211 *meta_ac = NULL;
212 }
213 }
214
215 return ret;
216}
217
218/*
219 * Using one journal handle to guarantee the data consistency in case
220 * crash happens anywhere.
221 *
222 * XXX: defrag can end up with finishing partial extent as requested,
223 * due to not enough contiguous clusters can be found in allocator.
224 */
225static int ocfs2_defrag_extent(struct ocfs2_move_extents_context *context,
226 u32 cpos, u32 phys_cpos, u32 *len, int ext_flags)
227{
228 int ret, credits = 0, extra_blocks = 0, partial = context->partial;
229 handle_t *handle;
230 struct inode *inode = context->inode;
231 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
232 struct inode *tl_inode = osb->osb_tl_inode;
233 struct ocfs2_refcount_tree *ref_tree = NULL;
234 u32 new_phys_cpos, new_len;
235 u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
236
237 if ((ext_flags & OCFS2_EXT_REFCOUNTED) && *len) {
238 BUG_ON(!ocfs2_is_refcount_inode(inode));
239 BUG_ON(!context->refcount_loc);
240
241 ret = ocfs2_lock_refcount_tree(osb, context->refcount_loc, 1,
242 &ref_tree, NULL);
243 if (ret) {
244 mlog_errno(ret);
245 return ret;
246 }
247
248 ret = ocfs2_prepare_refcount_change_for_del(inode,
249 context->refcount_loc,
250 phys_blkno,
251 *len,
252 &credits,
253 &extra_blocks);
254 if (ret) {
255 mlog_errno(ret);
256 goto out;
257 }
258 }
259
260 ret = ocfs2_lock_allocators_move_extents(inode, &context->et, *len, 1,
261 &context->meta_ac,
262 &context->data_ac,
263 extra_blocks, &credits);
264 if (ret) {
265 mlog_errno(ret);
266 goto out;
267 }
268
269 /*
270 * should be using allocation reservation strategy there?
271 *
272 * if (context->data_ac)
273 * context->data_ac->ac_resv = &OCFS2_I(inode)->ip_la_data_resv;
274 */
275
276 inode_lock(tl_inode);
277
278 if (ocfs2_truncate_log_needs_flush(osb)) {
279 ret = __ocfs2_flush_truncate_log(osb);
280 if (ret < 0) {
281 mlog_errno(ret);
282 goto out_unlock_mutex;
283 }
284 }
285
286 handle = ocfs2_start_trans(osb, credits);
287 if (IS_ERR(handle)) {
288 ret = PTR_ERR(handle);
289 mlog_errno(ret);
290 goto out_unlock_mutex;
291 }
292
293 ret = __ocfs2_claim_clusters(handle, context->data_ac, 1, *len,
294 &new_phys_cpos, &new_len);
295 if (ret) {
296 mlog_errno(ret);
297 goto out_commit;
298 }
299
300 /*
301 * allowing partial extent moving is kind of 'pros and cons', it makes
302 * whole defragmentation less likely to fail, on the contrary, the bad
303 * thing is it may make the fs even more fragmented after moving, let
304 * userspace make a good decision here.
305 */
306 if (new_len != *len) {
307 mlog(0, "len_claimed: %u, len: %u\n", new_len, *len);
308 if (!partial) {
309 context->range->me_flags &= ~OCFS2_MOVE_EXT_FL_COMPLETE;
310 ret = -ENOSPC;
311 goto out_commit;
312 }
313 }
314
315 mlog(0, "cpos: %u, phys_cpos: %u, new_phys_cpos: %u\n", cpos,
316 phys_cpos, new_phys_cpos);
317
318 ret = __ocfs2_move_extent(handle, context, cpos, new_len, phys_cpos,
319 new_phys_cpos, ext_flags);
320 if (ret)
321 mlog_errno(ret);
322
323 if (partial && (new_len != *len))
324 *len = new_len;
325
326 /*
327 * Here we should write the new page out first if we are
328 * in write-back mode.
329 */
330 ret = ocfs2_cow_sync_writeback(inode->i_sb, context->inode, cpos, *len);
331 if (ret)
332 mlog_errno(ret);
333
334out_commit:
335 ocfs2_commit_trans(osb, handle);
336
337out_unlock_mutex:
338 inode_unlock(tl_inode);
339
340 if (context->data_ac) {
341 ocfs2_free_alloc_context(context->data_ac);
342 context->data_ac = NULL;
343 }
344
345 if (context->meta_ac) {
346 ocfs2_free_alloc_context(context->meta_ac);
347 context->meta_ac = NULL;
348 }
349
350out:
351 if (ref_tree)
352 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
353
354 return ret;
355}
356
357/*
358 * find the victim alloc group, where #blkno fits.
359 */
360static int ocfs2_find_victim_alloc_group(struct inode *inode,
361 u64 vict_blkno,
362 int type, int slot,
363 int *vict_bit,
364 struct buffer_head **ret_bh)
365{
366 int ret, i, bits_per_unit = 0;
367 u64 blkno;
368 char namebuf[40];
369
370 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
371 struct buffer_head *ac_bh = NULL, *gd_bh = NULL;
372 struct ocfs2_chain_list *cl;
373 struct ocfs2_chain_rec *rec;
374 struct ocfs2_dinode *ac_dinode;
375 struct ocfs2_group_desc *bg;
376
377 ocfs2_sprintf_system_inode_name(namebuf, sizeof(namebuf), type, slot);
378 ret = ocfs2_lookup_ino_from_name(osb->sys_root_inode, namebuf,
379 strlen(namebuf), &blkno);
380 if (ret) {
381 ret = -ENOENT;
382 goto out;
383 }
384
385 ret = ocfs2_read_blocks_sync(osb, blkno, 1, &ac_bh);
386 if (ret) {
387 mlog_errno(ret);
388 goto out;
389 }
390
391 ac_dinode = (struct ocfs2_dinode *)ac_bh->b_data;
392 cl = &(ac_dinode->id2.i_chain);
393 rec = &(cl->cl_recs[0]);
394
395 if (type == GLOBAL_BITMAP_SYSTEM_INODE)
396 bits_per_unit = osb->s_clustersize_bits -
397 inode->i_sb->s_blocksize_bits;
398 /*
399 * 'vict_blkno' was out of the valid range.
400 */
401 if ((vict_blkno < le64_to_cpu(rec->c_blkno)) ||
402 (vict_blkno >= ((u64)le32_to_cpu(ac_dinode->id1.bitmap1.i_total) <<
403 bits_per_unit))) {
404 ret = -EINVAL;
405 goto out;
406 }
407
408 for (i = 0; i < le16_to_cpu(cl->cl_next_free_rec); i++) {
409
410 rec = &(cl->cl_recs[i]);
411 if (!rec)
412 continue;
413
414 bg = NULL;
415
416 do {
417 if (!bg)
418 blkno = le64_to_cpu(rec->c_blkno);
419 else
420 blkno = le64_to_cpu(bg->bg_next_group);
421
422 if (gd_bh) {
423 brelse(gd_bh);
424 gd_bh = NULL;
425 }
426
427 ret = ocfs2_read_blocks_sync(osb, blkno, 1, &gd_bh);
428 if (ret) {
429 mlog_errno(ret);
430 goto out;
431 }
432
433 bg = (struct ocfs2_group_desc *)gd_bh->b_data;
434
435 if (vict_blkno < (le64_to_cpu(bg->bg_blkno) +
436 le16_to_cpu(bg->bg_bits))) {
437
438 *ret_bh = gd_bh;
439 *vict_bit = (vict_blkno - blkno) >>
440 bits_per_unit;
441 mlog(0, "find the victim group: #%llu, "
442 "total_bits: %u, vict_bit: %u\n",
443 blkno, le16_to_cpu(bg->bg_bits),
444 *vict_bit);
445 goto out;
446 }
447
448 } while (le64_to_cpu(bg->bg_next_group));
449 }
450
451 ret = -EINVAL;
452out:
453 brelse(ac_bh);
454
455 /*
456 * caller has to release the gd_bh properly.
457 */
458 return ret;
459}
460
461/*
462 * XXX: helper to validate and adjust moving goal.
463 */
464static int ocfs2_validate_and_adjust_move_goal(struct inode *inode,
465 struct ocfs2_move_extents *range)
466{
467 int ret, goal_bit = 0;
468
469 struct buffer_head *gd_bh = NULL;
470 struct ocfs2_group_desc *bg;
471 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
472 int c_to_b = 1 << (osb->s_clustersize_bits -
473 inode->i_sb->s_blocksize_bits);
474
475 /*
476 * make goal become cluster aligned.
477 */
478 range->me_goal = ocfs2_block_to_cluster_start(inode->i_sb,
479 range->me_goal);
480 /*
481 * validate goal sits within global_bitmap, and return the victim
482 * group desc
483 */
484 ret = ocfs2_find_victim_alloc_group(inode, range->me_goal,
485 GLOBAL_BITMAP_SYSTEM_INODE,
486 OCFS2_INVALID_SLOT,
487 &goal_bit, &gd_bh);
488 if (ret)
489 goto out;
490
491 bg = (struct ocfs2_group_desc *)gd_bh->b_data;
492
493 /*
494 * moving goal is not allowd to start with a group desc blok(#0 blk)
495 * let's compromise to the latter cluster.
496 */
497 if (range->me_goal == le64_to_cpu(bg->bg_blkno))
498 range->me_goal += c_to_b;
499
500 /*
501 * movement is not gonna cross two groups.
502 */
503 if ((le16_to_cpu(bg->bg_bits) - goal_bit) * osb->s_clustersize <
504 range->me_len) {
505 ret = -EINVAL;
506 goto out;
507 }
508 /*
509 * more exact validations/adjustments will be performed later during
510 * moving operation for each extent range.
511 */
512 mlog(0, "extents get ready to be moved to #%llu block\n",
513 range->me_goal);
514
515out:
516 brelse(gd_bh);
517
518 return ret;
519}
520
521static void ocfs2_probe_alloc_group(struct inode *inode, struct buffer_head *bh,
522 int *goal_bit, u32 move_len, u32 max_hop,
523 u32 *phys_cpos)
524{
525 int i, used, last_free_bits = 0, base_bit = *goal_bit;
526 struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data;
527 u32 base_cpos = ocfs2_blocks_to_clusters(inode->i_sb,
528 le64_to_cpu(gd->bg_blkno));
529
530 for (i = base_bit; i < le16_to_cpu(gd->bg_bits); i++) {
531
532 used = ocfs2_test_bit(i, (unsigned long *)gd->bg_bitmap);
533 if (used) {
534 /*
535 * we even tried searching the free chunk by jumping
536 * a 'max_hop' distance, but still failed.
537 */
538 if ((i - base_bit) > max_hop) {
539 *phys_cpos = 0;
540 break;
541 }
542
543 if (last_free_bits)
544 last_free_bits = 0;
545
546 continue;
547 } else
548 last_free_bits++;
549
550 if (last_free_bits == move_len) {
551 *goal_bit = i;
552 *phys_cpos = base_cpos + i;
553 break;
554 }
555 }
556
557 mlog(0, "found phys_cpos: %u to fit the wanted moving.\n", *phys_cpos);
558}
559
560static int ocfs2_move_extent(struct ocfs2_move_extents_context *context,
561 u32 cpos, u32 phys_cpos, u32 *new_phys_cpos,
562 u32 len, int ext_flags)
563{
564 int ret, credits = 0, extra_blocks = 0, goal_bit = 0;
565 handle_t *handle;
566 struct inode *inode = context->inode;
567 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
568 struct inode *tl_inode = osb->osb_tl_inode;
569 struct inode *gb_inode = NULL;
570 struct buffer_head *gb_bh = NULL;
571 struct buffer_head *gd_bh = NULL;
572 struct ocfs2_group_desc *gd;
573 struct ocfs2_refcount_tree *ref_tree = NULL;
574 u32 move_max_hop = ocfs2_blocks_to_clusters(inode->i_sb,
575 context->range->me_threshold);
576 u64 phys_blkno, new_phys_blkno;
577
578 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
579
580 if ((ext_flags & OCFS2_EXT_REFCOUNTED) && len) {
581 BUG_ON(!ocfs2_is_refcount_inode(inode));
582 BUG_ON(!context->refcount_loc);
583
584 ret = ocfs2_lock_refcount_tree(osb, context->refcount_loc, 1,
585 &ref_tree, NULL);
586 if (ret) {
587 mlog_errno(ret);
588 return ret;
589 }
590
591 ret = ocfs2_prepare_refcount_change_for_del(inode,
592 context->refcount_loc,
593 phys_blkno,
594 len,
595 &credits,
596 &extra_blocks);
597 if (ret) {
598 mlog_errno(ret);
599 goto out;
600 }
601 }
602
603 ret = ocfs2_lock_allocators_move_extents(inode, &context->et, len, 1,
604 &context->meta_ac,
605 NULL, extra_blocks, &credits);
606 if (ret) {
607 mlog_errno(ret);
608 goto out;
609 }
610
611 /*
612 * need to count 2 extra credits for global_bitmap inode and
613 * group descriptor.
614 */
615 credits += OCFS2_INODE_UPDATE_CREDITS + 1;
616
617 /*
618 * ocfs2_move_extent() didn't reserve any clusters in lock_allocators()
619 * logic, while we still need to lock the global_bitmap.
620 */
621 gb_inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE,
622 OCFS2_INVALID_SLOT);
623 if (!gb_inode) {
624 mlog(ML_ERROR, "unable to get global_bitmap inode\n");
625 ret = -EIO;
626 goto out;
627 }
628
629 inode_lock(gb_inode);
630
631 ret = ocfs2_inode_lock(gb_inode, &gb_bh, 1);
632 if (ret) {
633 mlog_errno(ret);
634 goto out_unlock_gb_mutex;
635 }
636
637 inode_lock(tl_inode);
638
639 handle = ocfs2_start_trans(osb, credits);
640 if (IS_ERR(handle)) {
641 ret = PTR_ERR(handle);
642 mlog_errno(ret);
643 goto out_unlock_tl_inode;
644 }
645
646 new_phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, *new_phys_cpos);
647 ret = ocfs2_find_victim_alloc_group(inode, new_phys_blkno,
648 GLOBAL_BITMAP_SYSTEM_INODE,
649 OCFS2_INVALID_SLOT,
650 &goal_bit, &gd_bh);
651 if (ret) {
652 mlog_errno(ret);
653 goto out_commit;
654 }
655
656 /*
657 * probe the victim cluster group to find a proper
658 * region to fit wanted movement, it even will perfrom
659 * a best-effort attempt by compromising to a threshold
660 * around the goal.
661 */
662 ocfs2_probe_alloc_group(inode, gd_bh, &goal_bit, len, move_max_hop,
663 new_phys_cpos);
664 if (!*new_phys_cpos) {
665 ret = -ENOSPC;
666 goto out_commit;
667 }
668
669 ret = __ocfs2_move_extent(handle, context, cpos, len, phys_cpos,
670 *new_phys_cpos, ext_flags);
671 if (ret) {
672 mlog_errno(ret);
673 goto out_commit;
674 }
675
676 gd = (struct ocfs2_group_desc *)gd_bh->b_data;
677 ret = ocfs2_alloc_dinode_update_counts(gb_inode, handle, gb_bh, len,
678 le16_to_cpu(gd->bg_chain));
679 if (ret) {
680 mlog_errno(ret);
681 goto out_commit;
682 }
683
684 ret = ocfs2_block_group_set_bits(handle, gb_inode, gd, gd_bh,
685 goal_bit, len);
686 if (ret) {
687 ocfs2_rollback_alloc_dinode_counts(gb_inode, gb_bh, len,
688 le16_to_cpu(gd->bg_chain));
689 mlog_errno(ret);
690 }
691
692 /*
693 * Here we should write the new page out first if we are
694 * in write-back mode.
695 */
696 ret = ocfs2_cow_sync_writeback(inode->i_sb, context->inode, cpos, len);
697 if (ret)
698 mlog_errno(ret);
699
700out_commit:
701 ocfs2_commit_trans(osb, handle);
702 brelse(gd_bh);
703
704out_unlock_tl_inode:
705 inode_unlock(tl_inode);
706
707 ocfs2_inode_unlock(gb_inode, 1);
708out_unlock_gb_mutex:
709 inode_unlock(gb_inode);
710 brelse(gb_bh);
711 iput(gb_inode);
712
713out:
714 if (context->meta_ac) {
715 ocfs2_free_alloc_context(context->meta_ac);
716 context->meta_ac = NULL;
717 }
718
719 if (ref_tree)
720 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
721
722 return ret;
723}
724
725/*
726 * Helper to calculate the defraging length in one run according to threshold.
727 */
728static void ocfs2_calc_extent_defrag_len(u32 *alloc_size, u32 *len_defraged,
729 u32 threshold, int *skip)
730{
731 if ((*alloc_size + *len_defraged) < threshold) {
732 /*
733 * proceed defragmentation until we meet the thresh
734 */
735 *len_defraged += *alloc_size;
736 } else if (*len_defraged == 0) {
737 /*
738 * XXX: skip a large extent.
739 */
740 *skip = 1;
741 } else {
742 /*
743 * split this extent to coalesce with former pieces as
744 * to reach the threshold.
745 *
746 * we're done here with one cycle of defragmentation
747 * in a size of 'thresh', resetting 'len_defraged'
748 * forces a new defragmentation.
749 */
750 *alloc_size = threshold - *len_defraged;
751 *len_defraged = 0;
752 }
753}
754
755static int __ocfs2_move_extents_range(struct buffer_head *di_bh,
756 struct ocfs2_move_extents_context *context)
757{
758 int ret = 0, flags, do_defrag, skip = 0;
759 u32 cpos, phys_cpos, move_start, len_to_move, alloc_size;
760 u32 len_defraged = 0, defrag_thresh = 0, new_phys_cpos = 0;
761
762 struct inode *inode = context->inode;
763 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
764 struct ocfs2_move_extents *range = context->range;
765 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
766
767 if ((i_size_read(inode) == 0) || (range->me_len == 0))
768 return 0;
769
770 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
771 return 0;
772
773 context->refcount_loc = le64_to_cpu(di->i_refcount_loc);
774
775 ocfs2_init_dinode_extent_tree(&context->et, INODE_CACHE(inode), di_bh);
776 ocfs2_init_dealloc_ctxt(&context->dealloc);
777
778 /*
779 * TO-DO XXX:
780 *
781 * - xattr extents.
782 */
783
784 do_defrag = context->auto_defrag;
785
786 /*
787 * extents moving happens in unit of clusters, for the sake
788 * of simplicity, we may ignore two clusters where 'byte_start'
789 * and 'byte_start + len' were within.
790 */
791 move_start = ocfs2_clusters_for_bytes(osb->sb, range->me_start);
792 len_to_move = (range->me_start + range->me_len) >>
793 osb->s_clustersize_bits;
794 if (len_to_move >= move_start)
795 len_to_move -= move_start;
796 else
797 len_to_move = 0;
798
799 if (do_defrag) {
800 defrag_thresh = range->me_threshold >> osb->s_clustersize_bits;
801 if (defrag_thresh <= 1)
802 goto done;
803 } else
804 new_phys_cpos = ocfs2_blocks_to_clusters(inode->i_sb,
805 range->me_goal);
806
807 mlog(0, "Inode: %llu, start: %llu, len: %llu, cstart: %u, clen: %u, "
808 "thresh: %u\n",
809 (unsigned long long)OCFS2_I(inode)->ip_blkno,
810 (unsigned long long)range->me_start,
811 (unsigned long long)range->me_len,
812 move_start, len_to_move, defrag_thresh);
813
814 cpos = move_start;
815 while (len_to_move) {
816 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &alloc_size,
817 &flags);
818 if (ret) {
819 mlog_errno(ret);
820 goto out;
821 }
822
823 if (alloc_size > len_to_move)
824 alloc_size = len_to_move;
825
826 /*
827 * XXX: how to deal with a hole:
828 *
829 * - skip the hole of course
830 * - force a new defragmentation
831 */
832 if (!phys_cpos) {
833 if (do_defrag)
834 len_defraged = 0;
835
836 goto next;
837 }
838
839 if (do_defrag) {
840 ocfs2_calc_extent_defrag_len(&alloc_size, &len_defraged,
841 defrag_thresh, &skip);
842 /*
843 * skip large extents
844 */
845 if (skip) {
846 skip = 0;
847 goto next;
848 }
849
850 mlog(0, "#Defrag: cpos: %u, phys_cpos: %u, "
851 "alloc_size: %u, len_defraged: %u\n",
852 cpos, phys_cpos, alloc_size, len_defraged);
853
854 ret = ocfs2_defrag_extent(context, cpos, phys_cpos,
855 &alloc_size, flags);
856 } else {
857 ret = ocfs2_move_extent(context, cpos, phys_cpos,
858 &new_phys_cpos, alloc_size,
859 flags);
860
861 new_phys_cpos += alloc_size;
862 }
863
864 if (ret < 0) {
865 mlog_errno(ret);
866 goto out;
867 }
868
869 context->clusters_moved += alloc_size;
870next:
871 cpos += alloc_size;
872 len_to_move -= alloc_size;
873 }
874
875done:
876 range->me_flags |= OCFS2_MOVE_EXT_FL_COMPLETE;
877
878out:
879 range->me_moved_len = ocfs2_clusters_to_bytes(osb->sb,
880 context->clusters_moved);
881 range->me_new_offset = ocfs2_clusters_to_bytes(osb->sb,
882 context->new_phys_cpos);
883
884 ocfs2_schedule_truncate_log_flush(osb, 1);
885 ocfs2_run_deallocs(osb, &context->dealloc);
886
887 return ret;
888}
889
890static int ocfs2_move_extents(struct ocfs2_move_extents_context *context)
891{
892 int status;
893 handle_t *handle;
894 struct inode *inode = context->inode;
895 struct ocfs2_dinode *di;
896 struct buffer_head *di_bh = NULL;
897 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
898
899 if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
900 return -EROFS;
901
902 inode_lock(inode);
903
904 /*
905 * This prevents concurrent writes from other nodes
906 */
907 status = ocfs2_rw_lock(inode, 1);
908 if (status) {
909 mlog_errno(status);
910 goto out;
911 }
912
913 status = ocfs2_inode_lock(inode, &di_bh, 1);
914 if (status) {
915 mlog_errno(status);
916 goto out_rw_unlock;
917 }
918
919 /*
920 * rememer ip_xattr_sem also needs to be held if necessary
921 */
922 down_write(&OCFS2_I(inode)->ip_alloc_sem);
923
924 status = __ocfs2_move_extents_range(di_bh, context);
925
926 up_write(&OCFS2_I(inode)->ip_alloc_sem);
927 if (status) {
928 mlog_errno(status);
929 goto out_inode_unlock;
930 }
931
932 /*
933 * We update ctime for these changes
934 */
935 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
936 if (IS_ERR(handle)) {
937 status = PTR_ERR(handle);
938 mlog_errno(status);
939 goto out_inode_unlock;
940 }
941
942 status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
943 OCFS2_JOURNAL_ACCESS_WRITE);
944 if (status) {
945 mlog_errno(status);
946 goto out_commit;
947 }
948
949 di = (struct ocfs2_dinode *)di_bh->b_data;
950 inode->i_ctime = current_time(inode);
951 di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
952 di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
953 ocfs2_update_inode_fsync_trans(handle, inode, 0);
954
955 ocfs2_journal_dirty(handle, di_bh);
956
957out_commit:
958 ocfs2_commit_trans(osb, handle);
959
960out_inode_unlock:
961 brelse(di_bh);
962 ocfs2_inode_unlock(inode, 1);
963out_rw_unlock:
964 ocfs2_rw_unlock(inode, 1);
965out:
966 inode_unlock(inode);
967
968 return status;
969}
970
971int ocfs2_ioctl_move_extents(struct file *filp, void __user *argp)
972{
973 int status;
974
975 struct inode *inode = file_inode(filp);
976 struct ocfs2_move_extents range;
977 struct ocfs2_move_extents_context *context;
978
979 if (!argp)
980 return -EINVAL;
981
982 status = mnt_want_write_file(filp);
983 if (status)
984 return status;
985
986 if ((!S_ISREG(inode->i_mode)) || !(filp->f_mode & FMODE_WRITE)) {
987 status = -EPERM;
988 goto out_drop;
989 }
990
991 if (inode->i_flags & (S_IMMUTABLE|S_APPEND)) {
992 status = -EPERM;
993 goto out_drop;
994 }
995
996 context = kzalloc(sizeof(struct ocfs2_move_extents_context), GFP_NOFS);
997 if (!context) {
998 status = -ENOMEM;
999 mlog_errno(status);
1000 goto out_drop;
1001 }
1002
1003 context->inode = inode;
1004 context->file = filp;
1005
1006 if (copy_from_user(&range, argp, sizeof(range))) {
1007 status = -EFAULT;
1008 goto out_free;
1009 }
1010
1011 if (range.me_start > i_size_read(inode)) {
1012 status = -EINVAL;
1013 goto out_free;
1014 }
1015
1016 if (range.me_start + range.me_len > i_size_read(inode))
1017 range.me_len = i_size_read(inode) - range.me_start;
1018
1019 context->range = ⦥
1020
1021 if (range.me_flags & OCFS2_MOVE_EXT_FL_AUTO_DEFRAG) {
1022 context->auto_defrag = 1;
1023 /*
1024 * ok, the default theshold for the defragmentation
1025 * is 1M, since our maximum clustersize was 1M also.
1026 * any thought?
1027 */
1028 if (!range.me_threshold)
1029 range.me_threshold = 1024 * 1024;
1030
1031 if (range.me_threshold > i_size_read(inode))
1032 range.me_threshold = i_size_read(inode);
1033
1034 if (range.me_flags & OCFS2_MOVE_EXT_FL_PART_DEFRAG)
1035 context->partial = 1;
1036 } else {
1037 /*
1038 * first best-effort attempt to validate and adjust the goal
1039 * (physical address in block), while it can't guarantee later
1040 * operation can succeed all the time since global_bitmap may
1041 * change a bit over time.
1042 */
1043
1044 status = ocfs2_validate_and_adjust_move_goal(inode, &range);
1045 if (status)
1046 goto out_copy;
1047 }
1048
1049 status = ocfs2_move_extents(context);
1050 if (status)
1051 mlog_errno(status);
1052out_copy:
1053 /*
1054 * movement/defragmentation may end up being partially completed,
1055 * that's the reason why we need to return userspace the finished
1056 * length and new_offset even if failure happens somewhere.
1057 */
1058 if (copy_to_user(argp, &range, sizeof(range)))
1059 status = -EFAULT;
1060
1061out_free:
1062 kfree(context);
1063out_drop:
1064 mnt_drop_write_file(filp);
1065
1066 return status;
1067}
1// SPDX-License-Identifier: GPL-2.0-only
2/* -*- mode: c; c-basic-offset: 8; -*-
3 * vim: noexpandtab sw=8 ts=8 sts=0:
4 *
5 * move_extents.c
6 *
7 * Copyright (C) 2011 Oracle. All rights reserved.
8 */
9#include <linux/fs.h>
10#include <linux/types.h>
11#include <linux/mount.h>
12#include <linux/swap.h>
13
14#include <cluster/masklog.h>
15
16#include "ocfs2.h"
17#include "ocfs2_ioctl.h"
18
19#include "alloc.h"
20#include "localalloc.h"
21#include "aops.h"
22#include "dlmglue.h"
23#include "extent_map.h"
24#include "inode.h"
25#include "journal.h"
26#include "suballoc.h"
27#include "uptodate.h"
28#include "super.h"
29#include "dir.h"
30#include "buffer_head_io.h"
31#include "sysfile.h"
32#include "refcounttree.h"
33#include "move_extents.h"
34
35struct ocfs2_move_extents_context {
36 struct inode *inode;
37 struct file *file;
38 int auto_defrag;
39 int partial;
40 int credits;
41 u32 new_phys_cpos;
42 u32 clusters_moved;
43 u64 refcount_loc;
44 struct ocfs2_move_extents *range;
45 struct ocfs2_extent_tree et;
46 struct ocfs2_alloc_context *meta_ac;
47 struct ocfs2_alloc_context *data_ac;
48 struct ocfs2_cached_dealloc_ctxt dealloc;
49};
50
51static int __ocfs2_move_extent(handle_t *handle,
52 struct ocfs2_move_extents_context *context,
53 u32 cpos, u32 len, u32 p_cpos, u32 new_p_cpos,
54 int ext_flags)
55{
56 int ret = 0, index;
57 struct inode *inode = context->inode;
58 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
59 struct ocfs2_extent_rec *rec, replace_rec;
60 struct ocfs2_path *path = NULL;
61 struct ocfs2_extent_list *el;
62 u64 ino = ocfs2_metadata_cache_owner(context->et.et_ci);
63 u64 old_blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cpos);
64
65 ret = ocfs2_duplicate_clusters_by_page(handle, inode, cpos,
66 p_cpos, new_p_cpos, len);
67 if (ret) {
68 mlog_errno(ret);
69 goto out;
70 }
71
72 memset(&replace_rec, 0, sizeof(replace_rec));
73 replace_rec.e_cpos = cpu_to_le32(cpos);
74 replace_rec.e_leaf_clusters = cpu_to_le16(len);
75 replace_rec.e_blkno = cpu_to_le64(ocfs2_clusters_to_blocks(inode->i_sb,
76 new_p_cpos));
77
78 path = ocfs2_new_path_from_et(&context->et);
79 if (!path) {
80 ret = -ENOMEM;
81 mlog_errno(ret);
82 goto out;
83 }
84
85 ret = ocfs2_find_path(INODE_CACHE(inode), path, cpos);
86 if (ret) {
87 mlog_errno(ret);
88 goto out;
89 }
90
91 el = path_leaf_el(path);
92
93 index = ocfs2_search_extent_list(el, cpos);
94 if (index == -1) {
95 ret = ocfs2_error(inode->i_sb,
96 "Inode %llu has an extent at cpos %u which can no longer be found\n",
97 (unsigned long long)ino, cpos);
98 goto out;
99 }
100
101 rec = &el->l_recs[index];
102
103 BUG_ON(ext_flags != rec->e_flags);
104 /*
105 * after moving/defraging to new location, the extent is not going
106 * to be refcounted anymore.
107 */
108 replace_rec.e_flags = ext_flags & ~OCFS2_EXT_REFCOUNTED;
109
110 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode),
111 context->et.et_root_bh,
112 OCFS2_JOURNAL_ACCESS_WRITE);
113 if (ret) {
114 mlog_errno(ret);
115 goto out;
116 }
117
118 ret = ocfs2_split_extent(handle, &context->et, path, index,
119 &replace_rec, context->meta_ac,
120 &context->dealloc);
121 if (ret) {
122 mlog_errno(ret);
123 goto out;
124 }
125
126 ocfs2_journal_dirty(handle, context->et.et_root_bh);
127
128 context->new_phys_cpos = new_p_cpos;
129
130 /*
131 * need I to append truncate log for old clusters?
132 */
133 if (old_blkno) {
134 if (ext_flags & OCFS2_EXT_REFCOUNTED)
135 ret = ocfs2_decrease_refcount(inode, handle,
136 ocfs2_blocks_to_clusters(osb->sb,
137 old_blkno),
138 len, context->meta_ac,
139 &context->dealloc, 1);
140 else
141 ret = ocfs2_truncate_log_append(osb, handle,
142 old_blkno, len);
143 }
144
145 ocfs2_update_inode_fsync_trans(handle, inode, 0);
146out:
147 ocfs2_free_path(path);
148 return ret;
149}
150
151/*
152 * lock allocator, and reserve appropriate number of bits for
153 * meta blocks.
154 */
155static int ocfs2_lock_meta_allocator_move_extents(struct inode *inode,
156 struct ocfs2_extent_tree *et,
157 u32 clusters_to_move,
158 u32 extents_to_split,
159 struct ocfs2_alloc_context **meta_ac,
160 int extra_blocks,
161 int *credits)
162{
163 int ret, num_free_extents;
164 unsigned int max_recs_needed = 2 * extents_to_split + clusters_to_move;
165 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
166
167 num_free_extents = ocfs2_num_free_extents(et);
168 if (num_free_extents < 0) {
169 ret = num_free_extents;
170 mlog_errno(ret);
171 goto out;
172 }
173
174 if (!num_free_extents ||
175 (ocfs2_sparse_alloc(osb) && num_free_extents < max_recs_needed))
176 extra_blocks += ocfs2_extend_meta_needed(et->et_root_el);
177
178 ret = ocfs2_reserve_new_metadata_blocks(osb, extra_blocks, meta_ac);
179 if (ret) {
180 mlog_errno(ret);
181 goto out;
182 }
183
184
185 *credits += ocfs2_calc_extend_credits(osb->sb, et->et_root_el);
186
187 mlog(0, "reserve metadata_blocks: %d, data_clusters: %u, credits: %d\n",
188 extra_blocks, clusters_to_move, *credits);
189out:
190 if (ret) {
191 if (*meta_ac) {
192 ocfs2_free_alloc_context(*meta_ac);
193 *meta_ac = NULL;
194 }
195 }
196
197 return ret;
198}
199
200/*
201 * Using one journal handle to guarantee the data consistency in case
202 * crash happens anywhere.
203 *
204 * XXX: defrag can end up with finishing partial extent as requested,
205 * due to not enough contiguous clusters can be found in allocator.
206 */
207static int ocfs2_defrag_extent(struct ocfs2_move_extents_context *context,
208 u32 cpos, u32 phys_cpos, u32 *len, int ext_flags)
209{
210 int ret, credits = 0, extra_blocks = 0, partial = context->partial;
211 handle_t *handle;
212 struct inode *inode = context->inode;
213 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
214 struct inode *tl_inode = osb->osb_tl_inode;
215 struct ocfs2_refcount_tree *ref_tree = NULL;
216 u32 new_phys_cpos, new_len;
217 u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
218 int need_free = 0;
219
220 if ((ext_flags & OCFS2_EXT_REFCOUNTED) && *len) {
221 BUG_ON(!ocfs2_is_refcount_inode(inode));
222 BUG_ON(!context->refcount_loc);
223
224 ret = ocfs2_lock_refcount_tree(osb, context->refcount_loc, 1,
225 &ref_tree, NULL);
226 if (ret) {
227 mlog_errno(ret);
228 return ret;
229 }
230
231 ret = ocfs2_prepare_refcount_change_for_del(inode,
232 context->refcount_loc,
233 phys_blkno,
234 *len,
235 &credits,
236 &extra_blocks);
237 if (ret) {
238 mlog_errno(ret);
239 goto out;
240 }
241 }
242
243 ret = ocfs2_lock_meta_allocator_move_extents(inode, &context->et,
244 *len, 1,
245 &context->meta_ac,
246 extra_blocks, &credits);
247 if (ret) {
248 mlog_errno(ret);
249 goto out;
250 }
251
252 /*
253 * should be using allocation reservation strategy there?
254 *
255 * if (context->data_ac)
256 * context->data_ac->ac_resv = &OCFS2_I(inode)->ip_la_data_resv;
257 */
258
259 inode_lock(tl_inode);
260
261 if (ocfs2_truncate_log_needs_flush(osb)) {
262 ret = __ocfs2_flush_truncate_log(osb);
263 if (ret < 0) {
264 mlog_errno(ret);
265 goto out_unlock_mutex;
266 }
267 }
268
269 /*
270 * Make sure ocfs2_reserve_cluster is called after
271 * __ocfs2_flush_truncate_log, otherwise, dead lock may happen.
272 *
273 * If ocfs2_reserve_cluster is called
274 * before __ocfs2_flush_truncate_log, dead lock on global bitmap
275 * may happen.
276 *
277 */
278 ret = ocfs2_reserve_clusters(osb, *len, &context->data_ac);
279 if (ret) {
280 mlog_errno(ret);
281 goto out_unlock_mutex;
282 }
283
284 handle = ocfs2_start_trans(osb, credits);
285 if (IS_ERR(handle)) {
286 ret = PTR_ERR(handle);
287 mlog_errno(ret);
288 goto out_unlock_mutex;
289 }
290
291 ret = __ocfs2_claim_clusters(handle, context->data_ac, 1, *len,
292 &new_phys_cpos, &new_len);
293 if (ret) {
294 mlog_errno(ret);
295 goto out_commit;
296 }
297
298 /*
299 * allowing partial extent moving is kind of 'pros and cons', it makes
300 * whole defragmentation less likely to fail, on the contrary, the bad
301 * thing is it may make the fs even more fragmented after moving, let
302 * userspace make a good decision here.
303 */
304 if (new_len != *len) {
305 mlog(0, "len_claimed: %u, len: %u\n", new_len, *len);
306 if (!partial) {
307 context->range->me_flags &= ~OCFS2_MOVE_EXT_FL_COMPLETE;
308 ret = -ENOSPC;
309 need_free = 1;
310 goto out_commit;
311 }
312 }
313
314 mlog(0, "cpos: %u, phys_cpos: %u, new_phys_cpos: %u\n", cpos,
315 phys_cpos, new_phys_cpos);
316
317 ret = __ocfs2_move_extent(handle, context, cpos, new_len, phys_cpos,
318 new_phys_cpos, ext_flags);
319 if (ret)
320 mlog_errno(ret);
321
322 if (partial && (new_len != *len))
323 *len = new_len;
324
325 /*
326 * Here we should write the new page out first if we are
327 * in write-back mode.
328 */
329 ret = ocfs2_cow_sync_writeback(inode->i_sb, context->inode, cpos, *len);
330 if (ret)
331 mlog_errno(ret);
332
333out_commit:
334 if (need_free && context->data_ac) {
335 struct ocfs2_alloc_context *data_ac = context->data_ac;
336
337 if (context->data_ac->ac_which == OCFS2_AC_USE_LOCAL)
338 ocfs2_free_local_alloc_bits(osb, handle, data_ac,
339 new_phys_cpos, new_len);
340 else
341 ocfs2_free_clusters(handle,
342 data_ac->ac_inode,
343 data_ac->ac_bh,
344 ocfs2_clusters_to_blocks(osb->sb, new_phys_cpos),
345 new_len);
346 }
347
348 ocfs2_commit_trans(osb, handle);
349
350out_unlock_mutex:
351 inode_unlock(tl_inode);
352
353 if (context->data_ac) {
354 ocfs2_free_alloc_context(context->data_ac);
355 context->data_ac = NULL;
356 }
357
358 if (context->meta_ac) {
359 ocfs2_free_alloc_context(context->meta_ac);
360 context->meta_ac = NULL;
361 }
362
363out:
364 if (ref_tree)
365 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
366
367 return ret;
368}
369
370/*
371 * find the victim alloc group, where #blkno fits.
372 */
373static int ocfs2_find_victim_alloc_group(struct inode *inode,
374 u64 vict_blkno,
375 int type, int slot,
376 int *vict_bit,
377 struct buffer_head **ret_bh)
378{
379 int ret, i, bits_per_unit = 0;
380 u64 blkno;
381 char namebuf[40];
382
383 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
384 struct buffer_head *ac_bh = NULL, *gd_bh = NULL;
385 struct ocfs2_chain_list *cl;
386 struct ocfs2_chain_rec *rec;
387 struct ocfs2_dinode *ac_dinode;
388 struct ocfs2_group_desc *bg;
389
390 ocfs2_sprintf_system_inode_name(namebuf, sizeof(namebuf), type, slot);
391 ret = ocfs2_lookup_ino_from_name(osb->sys_root_inode, namebuf,
392 strlen(namebuf), &blkno);
393 if (ret) {
394 ret = -ENOENT;
395 goto out;
396 }
397
398 ret = ocfs2_read_blocks_sync(osb, blkno, 1, &ac_bh);
399 if (ret) {
400 mlog_errno(ret);
401 goto out;
402 }
403
404 ac_dinode = (struct ocfs2_dinode *)ac_bh->b_data;
405 cl = &(ac_dinode->id2.i_chain);
406 rec = &(cl->cl_recs[0]);
407
408 if (type == GLOBAL_BITMAP_SYSTEM_INODE)
409 bits_per_unit = osb->s_clustersize_bits -
410 inode->i_sb->s_blocksize_bits;
411 /*
412 * 'vict_blkno' was out of the valid range.
413 */
414 if ((vict_blkno < le64_to_cpu(rec->c_blkno)) ||
415 (vict_blkno >= ((u64)le32_to_cpu(ac_dinode->id1.bitmap1.i_total) <<
416 bits_per_unit))) {
417 ret = -EINVAL;
418 goto out;
419 }
420
421 for (i = 0; i < le16_to_cpu(cl->cl_next_free_rec); i++) {
422
423 rec = &(cl->cl_recs[i]);
424 if (!rec)
425 continue;
426
427 bg = NULL;
428
429 do {
430 if (!bg)
431 blkno = le64_to_cpu(rec->c_blkno);
432 else
433 blkno = le64_to_cpu(bg->bg_next_group);
434
435 if (gd_bh) {
436 brelse(gd_bh);
437 gd_bh = NULL;
438 }
439
440 ret = ocfs2_read_blocks_sync(osb, blkno, 1, &gd_bh);
441 if (ret) {
442 mlog_errno(ret);
443 goto out;
444 }
445
446 bg = (struct ocfs2_group_desc *)gd_bh->b_data;
447
448 if (vict_blkno < (le64_to_cpu(bg->bg_blkno) +
449 le16_to_cpu(bg->bg_bits))) {
450
451 *ret_bh = gd_bh;
452 *vict_bit = (vict_blkno - blkno) >>
453 bits_per_unit;
454 mlog(0, "find the victim group: #%llu, "
455 "total_bits: %u, vict_bit: %u\n",
456 blkno, le16_to_cpu(bg->bg_bits),
457 *vict_bit);
458 goto out;
459 }
460
461 } while (le64_to_cpu(bg->bg_next_group));
462 }
463
464 ret = -EINVAL;
465out:
466 brelse(ac_bh);
467
468 /*
469 * caller has to release the gd_bh properly.
470 */
471 return ret;
472}
473
474/*
475 * XXX: helper to validate and adjust moving goal.
476 */
477static int ocfs2_validate_and_adjust_move_goal(struct inode *inode,
478 struct ocfs2_move_extents *range)
479{
480 int ret, goal_bit = 0;
481
482 struct buffer_head *gd_bh = NULL;
483 struct ocfs2_group_desc *bg;
484 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
485 int c_to_b = 1 << (osb->s_clustersize_bits -
486 inode->i_sb->s_blocksize_bits);
487
488 /*
489 * make goal become cluster aligned.
490 */
491 range->me_goal = ocfs2_block_to_cluster_start(inode->i_sb,
492 range->me_goal);
493 /*
494 * validate goal sits within global_bitmap, and return the victim
495 * group desc
496 */
497 ret = ocfs2_find_victim_alloc_group(inode, range->me_goal,
498 GLOBAL_BITMAP_SYSTEM_INODE,
499 OCFS2_INVALID_SLOT,
500 &goal_bit, &gd_bh);
501 if (ret)
502 goto out;
503
504 bg = (struct ocfs2_group_desc *)gd_bh->b_data;
505
506 /*
507 * moving goal is not allowd to start with a group desc blok(#0 blk)
508 * let's compromise to the latter cluster.
509 */
510 if (range->me_goal == le64_to_cpu(bg->bg_blkno))
511 range->me_goal += c_to_b;
512
513 /*
514 * movement is not gonna cross two groups.
515 */
516 if ((le16_to_cpu(bg->bg_bits) - goal_bit) * osb->s_clustersize <
517 range->me_len) {
518 ret = -EINVAL;
519 goto out;
520 }
521 /*
522 * more exact validations/adjustments will be performed later during
523 * moving operation for each extent range.
524 */
525 mlog(0, "extents get ready to be moved to #%llu block\n",
526 range->me_goal);
527
528out:
529 brelse(gd_bh);
530
531 return ret;
532}
533
534static void ocfs2_probe_alloc_group(struct inode *inode, struct buffer_head *bh,
535 int *goal_bit, u32 move_len, u32 max_hop,
536 u32 *phys_cpos)
537{
538 int i, used, last_free_bits = 0, base_bit = *goal_bit;
539 struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data;
540 u32 base_cpos = ocfs2_blocks_to_clusters(inode->i_sb,
541 le64_to_cpu(gd->bg_blkno));
542
543 for (i = base_bit; i < le16_to_cpu(gd->bg_bits); i++) {
544
545 used = ocfs2_test_bit(i, (unsigned long *)gd->bg_bitmap);
546 if (used) {
547 /*
548 * we even tried searching the free chunk by jumping
549 * a 'max_hop' distance, but still failed.
550 */
551 if ((i - base_bit) > max_hop) {
552 *phys_cpos = 0;
553 break;
554 }
555
556 if (last_free_bits)
557 last_free_bits = 0;
558
559 continue;
560 } else
561 last_free_bits++;
562
563 if (last_free_bits == move_len) {
564 *goal_bit = i;
565 *phys_cpos = base_cpos + i;
566 break;
567 }
568 }
569
570 mlog(0, "found phys_cpos: %u to fit the wanted moving.\n", *phys_cpos);
571}
572
573static int ocfs2_move_extent(struct ocfs2_move_extents_context *context,
574 u32 cpos, u32 phys_cpos, u32 *new_phys_cpos,
575 u32 len, int ext_flags)
576{
577 int ret, credits = 0, extra_blocks = 0, goal_bit = 0;
578 handle_t *handle;
579 struct inode *inode = context->inode;
580 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
581 struct inode *tl_inode = osb->osb_tl_inode;
582 struct inode *gb_inode = NULL;
583 struct buffer_head *gb_bh = NULL;
584 struct buffer_head *gd_bh = NULL;
585 struct ocfs2_group_desc *gd;
586 struct ocfs2_refcount_tree *ref_tree = NULL;
587 u32 move_max_hop = ocfs2_blocks_to_clusters(inode->i_sb,
588 context->range->me_threshold);
589 u64 phys_blkno, new_phys_blkno;
590
591 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
592
593 if ((ext_flags & OCFS2_EXT_REFCOUNTED) && len) {
594 BUG_ON(!ocfs2_is_refcount_inode(inode));
595 BUG_ON(!context->refcount_loc);
596
597 ret = ocfs2_lock_refcount_tree(osb, context->refcount_loc, 1,
598 &ref_tree, NULL);
599 if (ret) {
600 mlog_errno(ret);
601 return ret;
602 }
603
604 ret = ocfs2_prepare_refcount_change_for_del(inode,
605 context->refcount_loc,
606 phys_blkno,
607 len,
608 &credits,
609 &extra_blocks);
610 if (ret) {
611 mlog_errno(ret);
612 goto out;
613 }
614 }
615
616 ret = ocfs2_lock_meta_allocator_move_extents(inode, &context->et,
617 len, 1,
618 &context->meta_ac,
619 extra_blocks, &credits);
620 if (ret) {
621 mlog_errno(ret);
622 goto out;
623 }
624
625 /*
626 * need to count 2 extra credits for global_bitmap inode and
627 * group descriptor.
628 */
629 credits += OCFS2_INODE_UPDATE_CREDITS + 1;
630
631 /*
632 * ocfs2_move_extent() didn't reserve any clusters in lock_allocators()
633 * logic, while we still need to lock the global_bitmap.
634 */
635 gb_inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE,
636 OCFS2_INVALID_SLOT);
637 if (!gb_inode) {
638 mlog(ML_ERROR, "unable to get global_bitmap inode\n");
639 ret = -EIO;
640 goto out;
641 }
642
643 inode_lock(gb_inode);
644
645 ret = ocfs2_inode_lock(gb_inode, &gb_bh, 1);
646 if (ret) {
647 mlog_errno(ret);
648 goto out_unlock_gb_mutex;
649 }
650
651 inode_lock(tl_inode);
652
653 handle = ocfs2_start_trans(osb, credits);
654 if (IS_ERR(handle)) {
655 ret = PTR_ERR(handle);
656 mlog_errno(ret);
657 goto out_unlock_tl_inode;
658 }
659
660 new_phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, *new_phys_cpos);
661 ret = ocfs2_find_victim_alloc_group(inode, new_phys_blkno,
662 GLOBAL_BITMAP_SYSTEM_INODE,
663 OCFS2_INVALID_SLOT,
664 &goal_bit, &gd_bh);
665 if (ret) {
666 mlog_errno(ret);
667 goto out_commit;
668 }
669
670 /*
671 * probe the victim cluster group to find a proper
672 * region to fit wanted movement, it even will perfrom
673 * a best-effort attempt by compromising to a threshold
674 * around the goal.
675 */
676 ocfs2_probe_alloc_group(inode, gd_bh, &goal_bit, len, move_max_hop,
677 new_phys_cpos);
678 if (!*new_phys_cpos) {
679 ret = -ENOSPC;
680 goto out_commit;
681 }
682
683 ret = __ocfs2_move_extent(handle, context, cpos, len, phys_cpos,
684 *new_phys_cpos, ext_flags);
685 if (ret) {
686 mlog_errno(ret);
687 goto out_commit;
688 }
689
690 gd = (struct ocfs2_group_desc *)gd_bh->b_data;
691 ret = ocfs2_alloc_dinode_update_counts(gb_inode, handle, gb_bh, len,
692 le16_to_cpu(gd->bg_chain));
693 if (ret) {
694 mlog_errno(ret);
695 goto out_commit;
696 }
697
698 ret = ocfs2_block_group_set_bits(handle, gb_inode, gd, gd_bh,
699 goal_bit, len);
700 if (ret) {
701 ocfs2_rollback_alloc_dinode_counts(gb_inode, gb_bh, len,
702 le16_to_cpu(gd->bg_chain));
703 mlog_errno(ret);
704 }
705
706 /*
707 * Here we should write the new page out first if we are
708 * in write-back mode.
709 */
710 ret = ocfs2_cow_sync_writeback(inode->i_sb, context->inode, cpos, len);
711 if (ret)
712 mlog_errno(ret);
713
714out_commit:
715 ocfs2_commit_trans(osb, handle);
716 brelse(gd_bh);
717
718out_unlock_tl_inode:
719 inode_unlock(tl_inode);
720
721 ocfs2_inode_unlock(gb_inode, 1);
722out_unlock_gb_mutex:
723 inode_unlock(gb_inode);
724 brelse(gb_bh);
725 iput(gb_inode);
726
727out:
728 if (context->meta_ac) {
729 ocfs2_free_alloc_context(context->meta_ac);
730 context->meta_ac = NULL;
731 }
732
733 if (ref_tree)
734 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
735
736 return ret;
737}
738
739/*
740 * Helper to calculate the defraging length in one run according to threshold.
741 */
742static void ocfs2_calc_extent_defrag_len(u32 *alloc_size, u32 *len_defraged,
743 u32 threshold, int *skip)
744{
745 if ((*alloc_size + *len_defraged) < threshold) {
746 /*
747 * proceed defragmentation until we meet the thresh
748 */
749 *len_defraged += *alloc_size;
750 } else if (*len_defraged == 0) {
751 /*
752 * XXX: skip a large extent.
753 */
754 *skip = 1;
755 } else {
756 /*
757 * split this extent to coalesce with former pieces as
758 * to reach the threshold.
759 *
760 * we're done here with one cycle of defragmentation
761 * in a size of 'thresh', resetting 'len_defraged'
762 * forces a new defragmentation.
763 */
764 *alloc_size = threshold - *len_defraged;
765 *len_defraged = 0;
766 }
767}
768
769static int __ocfs2_move_extents_range(struct buffer_head *di_bh,
770 struct ocfs2_move_extents_context *context)
771{
772 int ret = 0, flags, do_defrag, skip = 0;
773 u32 cpos, phys_cpos, move_start, len_to_move, alloc_size;
774 u32 len_defraged = 0, defrag_thresh = 0, new_phys_cpos = 0;
775
776 struct inode *inode = context->inode;
777 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
778 struct ocfs2_move_extents *range = context->range;
779 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
780
781 if ((i_size_read(inode) == 0) || (range->me_len == 0))
782 return 0;
783
784 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
785 return 0;
786
787 context->refcount_loc = le64_to_cpu(di->i_refcount_loc);
788
789 ocfs2_init_dinode_extent_tree(&context->et, INODE_CACHE(inode), di_bh);
790 ocfs2_init_dealloc_ctxt(&context->dealloc);
791
792 /*
793 * TO-DO XXX:
794 *
795 * - xattr extents.
796 */
797
798 do_defrag = context->auto_defrag;
799
800 /*
801 * extents moving happens in unit of clusters, for the sake
802 * of simplicity, we may ignore two clusters where 'byte_start'
803 * and 'byte_start + len' were within.
804 */
805 move_start = ocfs2_clusters_for_bytes(osb->sb, range->me_start);
806 len_to_move = (range->me_start + range->me_len) >>
807 osb->s_clustersize_bits;
808 if (len_to_move >= move_start)
809 len_to_move -= move_start;
810 else
811 len_to_move = 0;
812
813 if (do_defrag) {
814 defrag_thresh = range->me_threshold >> osb->s_clustersize_bits;
815 if (defrag_thresh <= 1)
816 goto done;
817 } else
818 new_phys_cpos = ocfs2_blocks_to_clusters(inode->i_sb,
819 range->me_goal);
820
821 mlog(0, "Inode: %llu, start: %llu, len: %llu, cstart: %u, clen: %u, "
822 "thresh: %u\n",
823 (unsigned long long)OCFS2_I(inode)->ip_blkno,
824 (unsigned long long)range->me_start,
825 (unsigned long long)range->me_len,
826 move_start, len_to_move, defrag_thresh);
827
828 cpos = move_start;
829 while (len_to_move) {
830 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &alloc_size,
831 &flags);
832 if (ret) {
833 mlog_errno(ret);
834 goto out;
835 }
836
837 if (alloc_size > len_to_move)
838 alloc_size = len_to_move;
839
840 /*
841 * XXX: how to deal with a hole:
842 *
843 * - skip the hole of course
844 * - force a new defragmentation
845 */
846 if (!phys_cpos) {
847 if (do_defrag)
848 len_defraged = 0;
849
850 goto next;
851 }
852
853 if (do_defrag) {
854 ocfs2_calc_extent_defrag_len(&alloc_size, &len_defraged,
855 defrag_thresh, &skip);
856 /*
857 * skip large extents
858 */
859 if (skip) {
860 skip = 0;
861 goto next;
862 }
863
864 mlog(0, "#Defrag: cpos: %u, phys_cpos: %u, "
865 "alloc_size: %u, len_defraged: %u\n",
866 cpos, phys_cpos, alloc_size, len_defraged);
867
868 ret = ocfs2_defrag_extent(context, cpos, phys_cpos,
869 &alloc_size, flags);
870 } else {
871 ret = ocfs2_move_extent(context, cpos, phys_cpos,
872 &new_phys_cpos, alloc_size,
873 flags);
874
875 new_phys_cpos += alloc_size;
876 }
877
878 if (ret < 0) {
879 mlog_errno(ret);
880 goto out;
881 }
882
883 context->clusters_moved += alloc_size;
884next:
885 cpos += alloc_size;
886 len_to_move -= alloc_size;
887 }
888
889done:
890 range->me_flags |= OCFS2_MOVE_EXT_FL_COMPLETE;
891
892out:
893 range->me_moved_len = ocfs2_clusters_to_bytes(osb->sb,
894 context->clusters_moved);
895 range->me_new_offset = ocfs2_clusters_to_bytes(osb->sb,
896 context->new_phys_cpos);
897
898 ocfs2_schedule_truncate_log_flush(osb, 1);
899 ocfs2_run_deallocs(osb, &context->dealloc);
900
901 return ret;
902}
903
904static int ocfs2_move_extents(struct ocfs2_move_extents_context *context)
905{
906 int status;
907 handle_t *handle;
908 struct inode *inode = context->inode;
909 struct ocfs2_dinode *di;
910 struct buffer_head *di_bh = NULL;
911 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
912
913 if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
914 return -EROFS;
915
916 inode_lock(inode);
917
918 /*
919 * This prevents concurrent writes from other nodes
920 */
921 status = ocfs2_rw_lock(inode, 1);
922 if (status) {
923 mlog_errno(status);
924 goto out;
925 }
926
927 status = ocfs2_inode_lock(inode, &di_bh, 1);
928 if (status) {
929 mlog_errno(status);
930 goto out_rw_unlock;
931 }
932
933 /*
934 * rememer ip_xattr_sem also needs to be held if necessary
935 */
936 down_write(&OCFS2_I(inode)->ip_alloc_sem);
937
938 status = __ocfs2_move_extents_range(di_bh, context);
939
940 up_write(&OCFS2_I(inode)->ip_alloc_sem);
941 if (status) {
942 mlog_errno(status);
943 goto out_inode_unlock;
944 }
945
946 /*
947 * We update ctime for these changes
948 */
949 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
950 if (IS_ERR(handle)) {
951 status = PTR_ERR(handle);
952 mlog_errno(status);
953 goto out_inode_unlock;
954 }
955
956 status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
957 OCFS2_JOURNAL_ACCESS_WRITE);
958 if (status) {
959 mlog_errno(status);
960 goto out_commit;
961 }
962
963 di = (struct ocfs2_dinode *)di_bh->b_data;
964 inode->i_ctime = current_time(inode);
965 di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
966 di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
967 ocfs2_update_inode_fsync_trans(handle, inode, 0);
968
969 ocfs2_journal_dirty(handle, di_bh);
970
971out_commit:
972 ocfs2_commit_trans(osb, handle);
973
974out_inode_unlock:
975 brelse(di_bh);
976 ocfs2_inode_unlock(inode, 1);
977out_rw_unlock:
978 ocfs2_rw_unlock(inode, 1);
979out:
980 inode_unlock(inode);
981
982 return status;
983}
984
985int ocfs2_ioctl_move_extents(struct file *filp, void __user *argp)
986{
987 int status;
988
989 struct inode *inode = file_inode(filp);
990 struct ocfs2_move_extents range;
991 struct ocfs2_move_extents_context *context;
992
993 if (!argp)
994 return -EINVAL;
995
996 status = mnt_want_write_file(filp);
997 if (status)
998 return status;
999
1000 if ((!S_ISREG(inode->i_mode)) || !(filp->f_mode & FMODE_WRITE)) {
1001 status = -EPERM;
1002 goto out_drop;
1003 }
1004
1005 if (inode->i_flags & (S_IMMUTABLE|S_APPEND)) {
1006 status = -EPERM;
1007 goto out_drop;
1008 }
1009
1010 context = kzalloc(sizeof(struct ocfs2_move_extents_context), GFP_NOFS);
1011 if (!context) {
1012 status = -ENOMEM;
1013 mlog_errno(status);
1014 goto out_drop;
1015 }
1016
1017 context->inode = inode;
1018 context->file = filp;
1019
1020 if (copy_from_user(&range, argp, sizeof(range))) {
1021 status = -EFAULT;
1022 goto out_free;
1023 }
1024
1025 if (range.me_start > i_size_read(inode)) {
1026 status = -EINVAL;
1027 goto out_free;
1028 }
1029
1030 if (range.me_start + range.me_len > i_size_read(inode))
1031 range.me_len = i_size_read(inode) - range.me_start;
1032
1033 context->range = ⦥
1034
1035 if (range.me_flags & OCFS2_MOVE_EXT_FL_AUTO_DEFRAG) {
1036 context->auto_defrag = 1;
1037 /*
1038 * ok, the default theshold for the defragmentation
1039 * is 1M, since our maximum clustersize was 1M also.
1040 * any thought?
1041 */
1042 if (!range.me_threshold)
1043 range.me_threshold = 1024 * 1024;
1044
1045 if (range.me_threshold > i_size_read(inode))
1046 range.me_threshold = i_size_read(inode);
1047
1048 if (range.me_flags & OCFS2_MOVE_EXT_FL_PART_DEFRAG)
1049 context->partial = 1;
1050 } else {
1051 /*
1052 * first best-effort attempt to validate and adjust the goal
1053 * (physical address in block), while it can't guarantee later
1054 * operation can succeed all the time since global_bitmap may
1055 * change a bit over time.
1056 */
1057
1058 status = ocfs2_validate_and_adjust_move_goal(inode, &range);
1059 if (status)
1060 goto out_copy;
1061 }
1062
1063 status = ocfs2_move_extents(context);
1064 if (status)
1065 mlog_errno(status);
1066out_copy:
1067 /*
1068 * movement/defragmentation may end up being partially completed,
1069 * that's the reason why we need to return userspace the finished
1070 * length and new_offset even if failure happens somewhere.
1071 */
1072 if (copy_to_user(argp, &range, sizeof(range)))
1073 status = -EFAULT;
1074
1075out_free:
1076 kfree(context);
1077out_drop:
1078 mnt_drop_write_file(filp);
1079
1080 return status;
1081}