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1// SPDX-License-Identifier: GPL-2.0-or-later
2/* -*- mode: c; c-basic-offset: 8; -*-
3 * vim: noexpandtab sw=8 ts=8 sts=0:
4 *
5 * suballoc.c
6 *
7 * metadata alloc and free
8 * Inspired by ext3 block groups.
9 *
10 * Copyright (C) 2002, 2004 Oracle. All rights reserved.
11 */
12
13#include <linux/fs.h>
14#include <linux/types.h>
15#include <linux/slab.h>
16#include <linux/highmem.h>
17
18#include <cluster/masklog.h>
19
20#include "ocfs2.h"
21
22#include "alloc.h"
23#include "blockcheck.h"
24#include "dlmglue.h"
25#include "inode.h"
26#include "journal.h"
27#include "localalloc.h"
28#include "suballoc.h"
29#include "super.h"
30#include "sysfile.h"
31#include "uptodate.h"
32#include "ocfs2_trace.h"
33
34#include "buffer_head_io.h"
35
36#define NOT_ALLOC_NEW_GROUP 0
37#define ALLOC_NEW_GROUP 0x1
38#define ALLOC_GROUPS_FROM_GLOBAL 0x2
39
40#define OCFS2_MAX_TO_STEAL 1024
41
42struct ocfs2_suballoc_result {
43 u64 sr_bg_blkno; /* The bg we allocated from. Set
44 to 0 when a block group is
45 contiguous. */
46 u64 sr_bg_stable_blkno; /*
47 * Doesn't change, always
48 * set to target block
49 * group descriptor
50 * block.
51 */
52 u64 sr_blkno; /* The first allocated block */
53 unsigned int sr_bit_offset; /* The bit in the bg */
54 unsigned int sr_bits; /* How many bits we claimed */
55};
56
57static u64 ocfs2_group_from_res(struct ocfs2_suballoc_result *res)
58{
59 if (res->sr_blkno == 0)
60 return 0;
61
62 if (res->sr_bg_blkno)
63 return res->sr_bg_blkno;
64
65 return ocfs2_which_suballoc_group(res->sr_blkno, res->sr_bit_offset);
66}
67
68static inline u16 ocfs2_find_victim_chain(struct ocfs2_chain_list *cl);
69static int ocfs2_block_group_fill(handle_t *handle,
70 struct inode *alloc_inode,
71 struct buffer_head *bg_bh,
72 u64 group_blkno,
73 unsigned int group_clusters,
74 u16 my_chain,
75 struct ocfs2_chain_list *cl);
76static int ocfs2_block_group_alloc(struct ocfs2_super *osb,
77 struct inode *alloc_inode,
78 struct buffer_head *bh,
79 u64 max_block,
80 u64 *last_alloc_group,
81 int flags);
82
83static int ocfs2_cluster_group_search(struct inode *inode,
84 struct buffer_head *group_bh,
85 u32 bits_wanted, u32 min_bits,
86 u64 max_block,
87 struct ocfs2_suballoc_result *res);
88static int ocfs2_block_group_search(struct inode *inode,
89 struct buffer_head *group_bh,
90 u32 bits_wanted, u32 min_bits,
91 u64 max_block,
92 struct ocfs2_suballoc_result *res);
93static int ocfs2_claim_suballoc_bits(struct ocfs2_alloc_context *ac,
94 handle_t *handle,
95 u32 bits_wanted,
96 u32 min_bits,
97 struct ocfs2_suballoc_result *res);
98static int ocfs2_test_bg_bit_allocatable(struct buffer_head *bg_bh,
99 int nr);
100static int ocfs2_relink_block_group(handle_t *handle,
101 struct inode *alloc_inode,
102 struct buffer_head *fe_bh,
103 struct buffer_head *bg_bh,
104 struct buffer_head *prev_bg_bh,
105 u16 chain);
106static inline int ocfs2_block_group_reasonably_empty(struct ocfs2_group_desc *bg,
107 u32 wanted);
108static inline u32 ocfs2_desc_bitmap_to_cluster_off(struct inode *inode,
109 u64 bg_blkno,
110 u16 bg_bit_off);
111static inline void ocfs2_block_to_cluster_group(struct inode *inode,
112 u64 data_blkno,
113 u64 *bg_blkno,
114 u16 *bg_bit_off);
115static int ocfs2_reserve_clusters_with_limit(struct ocfs2_super *osb,
116 u32 bits_wanted, u64 max_block,
117 int flags,
118 struct ocfs2_alloc_context **ac);
119
120void ocfs2_free_ac_resource(struct ocfs2_alloc_context *ac)
121{
122 struct inode *inode = ac->ac_inode;
123
124 if (inode) {
125 if (ac->ac_which != OCFS2_AC_USE_LOCAL)
126 ocfs2_inode_unlock(inode, 1);
127
128 inode_unlock(inode);
129
130 iput(inode);
131 ac->ac_inode = NULL;
132 }
133 brelse(ac->ac_bh);
134 ac->ac_bh = NULL;
135 ac->ac_resv = NULL;
136 kfree(ac->ac_find_loc_priv);
137 ac->ac_find_loc_priv = NULL;
138}
139
140void ocfs2_free_alloc_context(struct ocfs2_alloc_context *ac)
141{
142 ocfs2_free_ac_resource(ac);
143 kfree(ac);
144}
145
146static u32 ocfs2_bits_per_group(struct ocfs2_chain_list *cl)
147{
148 return (u32)le16_to_cpu(cl->cl_cpg) * (u32)le16_to_cpu(cl->cl_bpc);
149}
150
151#define do_error(fmt, ...) \
152do { \
153 if (resize) \
154 mlog(ML_ERROR, fmt, ##__VA_ARGS__); \
155 else \
156 return ocfs2_error(sb, fmt, ##__VA_ARGS__); \
157} while (0)
158
159static int ocfs2_validate_gd_self(struct super_block *sb,
160 struct buffer_head *bh,
161 int resize)
162{
163 struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data;
164
165 if (!OCFS2_IS_VALID_GROUP_DESC(gd)) {
166 do_error("Group descriptor #%llu has bad signature %.*s\n",
167 (unsigned long long)bh->b_blocknr, 7,
168 gd->bg_signature);
169 }
170
171 if (le64_to_cpu(gd->bg_blkno) != bh->b_blocknr) {
172 do_error("Group descriptor #%llu has an invalid bg_blkno of %llu\n",
173 (unsigned long long)bh->b_blocknr,
174 (unsigned long long)le64_to_cpu(gd->bg_blkno));
175 }
176
177 if (le32_to_cpu(gd->bg_generation) != OCFS2_SB(sb)->fs_generation) {
178 do_error("Group descriptor #%llu has an invalid fs_generation of #%u\n",
179 (unsigned long long)bh->b_blocknr,
180 le32_to_cpu(gd->bg_generation));
181 }
182
183 if (le16_to_cpu(gd->bg_free_bits_count) > le16_to_cpu(gd->bg_bits)) {
184 do_error("Group descriptor #%llu has bit count %u but claims that %u are free\n",
185 (unsigned long long)bh->b_blocknr,
186 le16_to_cpu(gd->bg_bits),
187 le16_to_cpu(gd->bg_free_bits_count));
188 }
189
190 if (le16_to_cpu(gd->bg_bits) > (8 * le16_to_cpu(gd->bg_size))) {
191 do_error("Group descriptor #%llu has bit count %u but max bitmap bits of %u\n",
192 (unsigned long long)bh->b_blocknr,
193 le16_to_cpu(gd->bg_bits),
194 8 * le16_to_cpu(gd->bg_size));
195 }
196
197 return 0;
198}
199
200static int ocfs2_validate_gd_parent(struct super_block *sb,
201 struct ocfs2_dinode *di,
202 struct buffer_head *bh,
203 int resize)
204{
205 unsigned int max_bits;
206 struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data;
207
208 if (di->i_blkno != gd->bg_parent_dinode) {
209 do_error("Group descriptor #%llu has bad parent pointer (%llu, expected %llu)\n",
210 (unsigned long long)bh->b_blocknr,
211 (unsigned long long)le64_to_cpu(gd->bg_parent_dinode),
212 (unsigned long long)le64_to_cpu(di->i_blkno));
213 }
214
215 max_bits = le16_to_cpu(di->id2.i_chain.cl_cpg) * le16_to_cpu(di->id2.i_chain.cl_bpc);
216 if (le16_to_cpu(gd->bg_bits) > max_bits) {
217 do_error("Group descriptor #%llu has bit count of %u\n",
218 (unsigned long long)bh->b_blocknr,
219 le16_to_cpu(gd->bg_bits));
220 }
221
222 /* In resize, we may meet the case bg_chain == cl_next_free_rec. */
223 if ((le16_to_cpu(gd->bg_chain) >
224 le16_to_cpu(di->id2.i_chain.cl_next_free_rec)) ||
225 ((le16_to_cpu(gd->bg_chain) ==
226 le16_to_cpu(di->id2.i_chain.cl_next_free_rec)) && !resize)) {
227 do_error("Group descriptor #%llu has bad chain %u\n",
228 (unsigned long long)bh->b_blocknr,
229 le16_to_cpu(gd->bg_chain));
230 }
231
232 return 0;
233}
234
235#undef do_error
236
237/*
238 * This version only prints errors. It does not fail the filesystem, and
239 * exists only for resize.
240 */
241int ocfs2_check_group_descriptor(struct super_block *sb,
242 struct ocfs2_dinode *di,
243 struct buffer_head *bh)
244{
245 int rc;
246 struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data;
247
248 BUG_ON(!buffer_uptodate(bh));
249
250 /*
251 * If the ecc fails, we return the error but otherwise
252 * leave the filesystem running. We know any error is
253 * local to this block.
254 */
255 rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &gd->bg_check);
256 if (rc) {
257 mlog(ML_ERROR,
258 "Checksum failed for group descriptor %llu\n",
259 (unsigned long long)bh->b_blocknr);
260 } else
261 rc = ocfs2_validate_gd_self(sb, bh, 1);
262 if (!rc)
263 rc = ocfs2_validate_gd_parent(sb, di, bh, 1);
264
265 return rc;
266}
267
268static int ocfs2_validate_group_descriptor(struct super_block *sb,
269 struct buffer_head *bh)
270{
271 int rc;
272 struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data;
273
274 trace_ocfs2_validate_group_descriptor(
275 (unsigned long long)bh->b_blocknr);
276
277 BUG_ON(!buffer_uptodate(bh));
278
279 /*
280 * If the ecc fails, we return the error but otherwise
281 * leave the filesystem running. We know any error is
282 * local to this block.
283 */
284 rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &gd->bg_check);
285 if (rc)
286 return rc;
287
288 /*
289 * Errors after here are fatal.
290 */
291
292 return ocfs2_validate_gd_self(sb, bh, 0);
293}
294
295int ocfs2_read_group_descriptor(struct inode *inode, struct ocfs2_dinode *di,
296 u64 gd_blkno, struct buffer_head **bh)
297{
298 int rc;
299 struct buffer_head *tmp = *bh;
300
301 rc = ocfs2_read_block(INODE_CACHE(inode), gd_blkno, &tmp,
302 ocfs2_validate_group_descriptor);
303 if (rc)
304 goto out;
305
306 rc = ocfs2_validate_gd_parent(inode->i_sb, di, tmp, 0);
307 if (rc) {
308 brelse(tmp);
309 goto out;
310 }
311
312 /* If ocfs2_read_block() got us a new bh, pass it up. */
313 if (!*bh)
314 *bh = tmp;
315
316out:
317 return rc;
318}
319
320static void ocfs2_bg_discontig_add_extent(struct ocfs2_super *osb,
321 struct ocfs2_group_desc *bg,
322 struct ocfs2_chain_list *cl,
323 u64 p_blkno, unsigned int clusters)
324{
325 struct ocfs2_extent_list *el = &bg->bg_list;
326 struct ocfs2_extent_rec *rec;
327
328 BUG_ON(!ocfs2_supports_discontig_bg(osb));
329 if (!el->l_next_free_rec)
330 el->l_count = cpu_to_le16(ocfs2_extent_recs_per_gd(osb->sb));
331 rec = &el->l_recs[le16_to_cpu(el->l_next_free_rec)];
332 rec->e_blkno = cpu_to_le64(p_blkno);
333 rec->e_cpos = cpu_to_le32(le16_to_cpu(bg->bg_bits) /
334 le16_to_cpu(cl->cl_bpc));
335 rec->e_leaf_clusters = cpu_to_le16(clusters);
336 le16_add_cpu(&bg->bg_bits, clusters * le16_to_cpu(cl->cl_bpc));
337 le16_add_cpu(&bg->bg_free_bits_count,
338 clusters * le16_to_cpu(cl->cl_bpc));
339 le16_add_cpu(&el->l_next_free_rec, 1);
340}
341
342static int ocfs2_block_group_fill(handle_t *handle,
343 struct inode *alloc_inode,
344 struct buffer_head *bg_bh,
345 u64 group_blkno,
346 unsigned int group_clusters,
347 u16 my_chain,
348 struct ocfs2_chain_list *cl)
349{
350 int status = 0;
351 struct ocfs2_super *osb = OCFS2_SB(alloc_inode->i_sb);
352 struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data;
353 struct super_block * sb = alloc_inode->i_sb;
354
355 if (((unsigned long long) bg_bh->b_blocknr) != group_blkno) {
356 status = ocfs2_error(alloc_inode->i_sb,
357 "group block (%llu) != b_blocknr (%llu)\n",
358 (unsigned long long)group_blkno,
359 (unsigned long long) bg_bh->b_blocknr);
360 goto bail;
361 }
362
363 status = ocfs2_journal_access_gd(handle,
364 INODE_CACHE(alloc_inode),
365 bg_bh,
366 OCFS2_JOURNAL_ACCESS_CREATE);
367 if (status < 0) {
368 mlog_errno(status);
369 goto bail;
370 }
371
372 memset(bg, 0, sb->s_blocksize);
373 strcpy(bg->bg_signature, OCFS2_GROUP_DESC_SIGNATURE);
374 bg->bg_generation = cpu_to_le32(osb->fs_generation);
375 bg->bg_size = cpu_to_le16(ocfs2_group_bitmap_size(sb, 1,
376 osb->s_feature_incompat));
377 bg->bg_chain = cpu_to_le16(my_chain);
378 bg->bg_next_group = cl->cl_recs[my_chain].c_blkno;
379 bg->bg_parent_dinode = cpu_to_le64(OCFS2_I(alloc_inode)->ip_blkno);
380 bg->bg_blkno = cpu_to_le64(group_blkno);
381 if (group_clusters == le16_to_cpu(cl->cl_cpg))
382 bg->bg_bits = cpu_to_le16(ocfs2_bits_per_group(cl));
383 else
384 ocfs2_bg_discontig_add_extent(osb, bg, cl, group_blkno,
385 group_clusters);
386
387 /* set the 1st bit in the bitmap to account for the descriptor block */
388 ocfs2_set_bit(0, (unsigned long *)bg->bg_bitmap);
389 bg->bg_free_bits_count = cpu_to_le16(le16_to_cpu(bg->bg_bits) - 1);
390
391 ocfs2_journal_dirty(handle, bg_bh);
392
393 /* There is no need to zero out or otherwise initialize the
394 * other blocks in a group - All valid FS metadata in a block
395 * group stores the superblock fs_generation value at
396 * allocation time. */
397
398bail:
399 if (status)
400 mlog_errno(status);
401 return status;
402}
403
404static inline u16 ocfs2_find_smallest_chain(struct ocfs2_chain_list *cl)
405{
406 u16 curr, best;
407
408 best = curr = 0;
409 while (curr < le16_to_cpu(cl->cl_count)) {
410 if (le32_to_cpu(cl->cl_recs[best].c_total) >
411 le32_to_cpu(cl->cl_recs[curr].c_total))
412 best = curr;
413 curr++;
414 }
415 return best;
416}
417
418static struct buffer_head *
419ocfs2_block_group_alloc_contig(struct ocfs2_super *osb, handle_t *handle,
420 struct inode *alloc_inode,
421 struct ocfs2_alloc_context *ac,
422 struct ocfs2_chain_list *cl)
423{
424 int status;
425 u32 bit_off, num_bits;
426 u64 bg_blkno;
427 struct buffer_head *bg_bh;
428 unsigned int alloc_rec = ocfs2_find_smallest_chain(cl);
429
430 status = ocfs2_claim_clusters(handle, ac,
431 le16_to_cpu(cl->cl_cpg), &bit_off,
432 &num_bits);
433 if (status < 0) {
434 if (status != -ENOSPC)
435 mlog_errno(status);
436 goto bail;
437 }
438
439 /* setup the group */
440 bg_blkno = ocfs2_clusters_to_blocks(osb->sb, bit_off);
441 trace_ocfs2_block_group_alloc_contig(
442 (unsigned long long)bg_blkno, alloc_rec);
443
444 bg_bh = sb_getblk(osb->sb, bg_blkno);
445 if (!bg_bh) {
446 status = -ENOMEM;
447 mlog_errno(status);
448 goto bail;
449 }
450 ocfs2_set_new_buffer_uptodate(INODE_CACHE(alloc_inode), bg_bh);
451
452 status = ocfs2_block_group_fill(handle, alloc_inode, bg_bh,
453 bg_blkno, num_bits, alloc_rec, cl);
454 if (status < 0) {
455 brelse(bg_bh);
456 mlog_errno(status);
457 }
458
459bail:
460 return status ? ERR_PTR(status) : bg_bh;
461}
462
463static int ocfs2_block_group_claim_bits(struct ocfs2_super *osb,
464 handle_t *handle,
465 struct ocfs2_alloc_context *ac,
466 unsigned int min_bits,
467 u32 *bit_off, u32 *num_bits)
468{
469 int status = 0;
470
471 while (min_bits) {
472 status = ocfs2_claim_clusters(handle, ac, min_bits,
473 bit_off, num_bits);
474 if (status != -ENOSPC)
475 break;
476
477 min_bits >>= 1;
478 }
479
480 return status;
481}
482
483static int ocfs2_block_group_grow_discontig(handle_t *handle,
484 struct inode *alloc_inode,
485 struct buffer_head *bg_bh,
486 struct ocfs2_alloc_context *ac,
487 struct ocfs2_chain_list *cl,
488 unsigned int min_bits)
489{
490 int status;
491 struct ocfs2_super *osb = OCFS2_SB(alloc_inode->i_sb);
492 struct ocfs2_group_desc *bg =
493 (struct ocfs2_group_desc *)bg_bh->b_data;
494 unsigned int needed = le16_to_cpu(cl->cl_cpg) -
495 le16_to_cpu(bg->bg_bits) / le16_to_cpu(cl->cl_bpc);
496 u32 p_cpos, clusters;
497 u64 p_blkno;
498 struct ocfs2_extent_list *el = &bg->bg_list;
499
500 status = ocfs2_journal_access_gd(handle,
501 INODE_CACHE(alloc_inode),
502 bg_bh,
503 OCFS2_JOURNAL_ACCESS_CREATE);
504 if (status < 0) {
505 mlog_errno(status);
506 goto bail;
507 }
508
509 while ((needed > 0) && (le16_to_cpu(el->l_next_free_rec) <
510 le16_to_cpu(el->l_count))) {
511 if (min_bits > needed)
512 min_bits = needed;
513 status = ocfs2_block_group_claim_bits(osb, handle, ac,
514 min_bits, &p_cpos,
515 &clusters);
516 if (status < 0) {
517 if (status != -ENOSPC)
518 mlog_errno(status);
519 goto bail;
520 }
521 p_blkno = ocfs2_clusters_to_blocks(osb->sb, p_cpos);
522 ocfs2_bg_discontig_add_extent(osb, bg, cl, p_blkno,
523 clusters);
524
525 min_bits = clusters;
526 needed = le16_to_cpu(cl->cl_cpg) -
527 le16_to_cpu(bg->bg_bits) / le16_to_cpu(cl->cl_bpc);
528 }
529
530 if (needed > 0) {
531 /*
532 * We have used up all the extent rec but can't fill up
533 * the cpg. So bail out.
534 */
535 status = -ENOSPC;
536 goto bail;
537 }
538
539 ocfs2_journal_dirty(handle, bg_bh);
540
541bail:
542 return status;
543}
544
545static void ocfs2_bg_alloc_cleanup(handle_t *handle,
546 struct ocfs2_alloc_context *cluster_ac,
547 struct inode *alloc_inode,
548 struct buffer_head *bg_bh)
549{
550 int i, ret;
551 struct ocfs2_group_desc *bg;
552 struct ocfs2_extent_list *el;
553 struct ocfs2_extent_rec *rec;
554
555 if (!bg_bh)
556 return;
557
558 bg = (struct ocfs2_group_desc *)bg_bh->b_data;
559 el = &bg->bg_list;
560 for (i = 0; i < le16_to_cpu(el->l_next_free_rec); i++) {
561 rec = &el->l_recs[i];
562 ret = ocfs2_free_clusters(handle, cluster_ac->ac_inode,
563 cluster_ac->ac_bh,
564 le64_to_cpu(rec->e_blkno),
565 le16_to_cpu(rec->e_leaf_clusters));
566 if (ret)
567 mlog_errno(ret);
568 /* Try all the clusters to free */
569 }
570
571 ocfs2_remove_from_cache(INODE_CACHE(alloc_inode), bg_bh);
572 brelse(bg_bh);
573}
574
575static struct buffer_head *
576ocfs2_block_group_alloc_discontig(handle_t *handle,
577 struct inode *alloc_inode,
578 struct ocfs2_alloc_context *ac,
579 struct ocfs2_chain_list *cl)
580{
581 int status;
582 u32 bit_off, num_bits;
583 u64 bg_blkno;
584 unsigned int min_bits = le16_to_cpu(cl->cl_cpg) >> 1;
585 struct buffer_head *bg_bh = NULL;
586 unsigned int alloc_rec = ocfs2_find_smallest_chain(cl);
587 struct ocfs2_super *osb = OCFS2_SB(alloc_inode->i_sb);
588
589 if (!ocfs2_supports_discontig_bg(osb)) {
590 status = -ENOSPC;
591 goto bail;
592 }
593
594 status = ocfs2_extend_trans(handle,
595 ocfs2_calc_bg_discontig_credits(osb->sb));
596 if (status) {
597 mlog_errno(status);
598 goto bail;
599 }
600
601 /*
602 * We're going to be grabbing from multiple cluster groups.
603 * We don't have enough credits to relink them all, and the
604 * cluster groups will be staying in cache for the duration of
605 * this operation.
606 */
607 ac->ac_disable_chain_relink = 1;
608
609 /* Claim the first region */
610 status = ocfs2_block_group_claim_bits(osb, handle, ac, min_bits,
611 &bit_off, &num_bits);
612 if (status < 0) {
613 if (status != -ENOSPC)
614 mlog_errno(status);
615 goto bail;
616 }
617 min_bits = num_bits;
618
619 /* setup the group */
620 bg_blkno = ocfs2_clusters_to_blocks(osb->sb, bit_off);
621 trace_ocfs2_block_group_alloc_discontig(
622 (unsigned long long)bg_blkno, alloc_rec);
623
624 bg_bh = sb_getblk(osb->sb, bg_blkno);
625 if (!bg_bh) {
626 status = -ENOMEM;
627 mlog_errno(status);
628 goto bail;
629 }
630 ocfs2_set_new_buffer_uptodate(INODE_CACHE(alloc_inode), bg_bh);
631
632 status = ocfs2_block_group_fill(handle, alloc_inode, bg_bh,
633 bg_blkno, num_bits, alloc_rec, cl);
634 if (status < 0) {
635 mlog_errno(status);
636 goto bail;
637 }
638
639 status = ocfs2_block_group_grow_discontig(handle, alloc_inode,
640 bg_bh, ac, cl, min_bits);
641 if (status)
642 mlog_errno(status);
643
644bail:
645 if (status)
646 ocfs2_bg_alloc_cleanup(handle, ac, alloc_inode, bg_bh);
647 return status ? ERR_PTR(status) : bg_bh;
648}
649
650/*
651 * We expect the block group allocator to already be locked.
652 */
653static int ocfs2_block_group_alloc(struct ocfs2_super *osb,
654 struct inode *alloc_inode,
655 struct buffer_head *bh,
656 u64 max_block,
657 u64 *last_alloc_group,
658 int flags)
659{
660 int status, credits;
661 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) bh->b_data;
662 struct ocfs2_chain_list *cl;
663 struct ocfs2_alloc_context *ac = NULL;
664 handle_t *handle = NULL;
665 u16 alloc_rec;
666 struct buffer_head *bg_bh = NULL;
667 struct ocfs2_group_desc *bg;
668
669 BUG_ON(ocfs2_is_cluster_bitmap(alloc_inode));
670
671 cl = &fe->id2.i_chain;
672 status = ocfs2_reserve_clusters_with_limit(osb,
673 le16_to_cpu(cl->cl_cpg),
674 max_block, flags, &ac);
675 if (status < 0) {
676 if (status != -ENOSPC)
677 mlog_errno(status);
678 goto bail;
679 }
680
681 credits = ocfs2_calc_group_alloc_credits(osb->sb,
682 le16_to_cpu(cl->cl_cpg));
683 handle = ocfs2_start_trans(osb, credits);
684 if (IS_ERR(handle)) {
685 status = PTR_ERR(handle);
686 handle = NULL;
687 mlog_errno(status);
688 goto bail;
689 }
690
691 if (last_alloc_group && *last_alloc_group != 0) {
692 trace_ocfs2_block_group_alloc(
693 (unsigned long long)*last_alloc_group);
694 ac->ac_last_group = *last_alloc_group;
695 }
696
697 bg_bh = ocfs2_block_group_alloc_contig(osb, handle, alloc_inode,
698 ac, cl);
699 if (IS_ERR(bg_bh) && (PTR_ERR(bg_bh) == -ENOSPC))
700 bg_bh = ocfs2_block_group_alloc_discontig(handle,
701 alloc_inode,
702 ac, cl);
703 if (IS_ERR(bg_bh)) {
704 status = PTR_ERR(bg_bh);
705 bg_bh = NULL;
706 if (status != -ENOSPC)
707 mlog_errno(status);
708 goto bail;
709 }
710 bg = (struct ocfs2_group_desc *) bg_bh->b_data;
711
712 status = ocfs2_journal_access_di(handle, INODE_CACHE(alloc_inode),
713 bh, OCFS2_JOURNAL_ACCESS_WRITE);
714 if (status < 0) {
715 mlog_errno(status);
716 goto bail;
717 }
718
719 alloc_rec = le16_to_cpu(bg->bg_chain);
720 le32_add_cpu(&cl->cl_recs[alloc_rec].c_free,
721 le16_to_cpu(bg->bg_free_bits_count));
722 le32_add_cpu(&cl->cl_recs[alloc_rec].c_total,
723 le16_to_cpu(bg->bg_bits));
724 cl->cl_recs[alloc_rec].c_blkno = bg->bg_blkno;
725 if (le16_to_cpu(cl->cl_next_free_rec) < le16_to_cpu(cl->cl_count))
726 le16_add_cpu(&cl->cl_next_free_rec, 1);
727
728 le32_add_cpu(&fe->id1.bitmap1.i_used, le16_to_cpu(bg->bg_bits) -
729 le16_to_cpu(bg->bg_free_bits_count));
730 le32_add_cpu(&fe->id1.bitmap1.i_total, le16_to_cpu(bg->bg_bits));
731 le32_add_cpu(&fe->i_clusters, le16_to_cpu(cl->cl_cpg));
732
733 ocfs2_journal_dirty(handle, bh);
734
735 spin_lock(&OCFS2_I(alloc_inode)->ip_lock);
736 OCFS2_I(alloc_inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
737 fe->i_size = cpu_to_le64(ocfs2_clusters_to_bytes(alloc_inode->i_sb,
738 le32_to_cpu(fe->i_clusters)));
739 spin_unlock(&OCFS2_I(alloc_inode)->ip_lock);
740 i_size_write(alloc_inode, le64_to_cpu(fe->i_size));
741 alloc_inode->i_blocks = ocfs2_inode_sector_count(alloc_inode);
742 ocfs2_update_inode_fsync_trans(handle, alloc_inode, 0);
743
744 status = 0;
745
746 /* save the new last alloc group so that the caller can cache it. */
747 if (last_alloc_group)
748 *last_alloc_group = ac->ac_last_group;
749
750bail:
751 if (handle)
752 ocfs2_commit_trans(osb, handle);
753
754 if (ac)
755 ocfs2_free_alloc_context(ac);
756
757 brelse(bg_bh);
758
759 if (status)
760 mlog_errno(status);
761 return status;
762}
763
764static int ocfs2_reserve_suballoc_bits(struct ocfs2_super *osb,
765 struct ocfs2_alloc_context *ac,
766 int type,
767 u32 slot,
768 u64 *last_alloc_group,
769 int flags)
770{
771 int status;
772 u32 bits_wanted = ac->ac_bits_wanted;
773 struct inode *alloc_inode;
774 struct buffer_head *bh = NULL;
775 struct ocfs2_dinode *fe;
776 u32 free_bits;
777
778 alloc_inode = ocfs2_get_system_file_inode(osb, type, slot);
779 if (!alloc_inode) {
780 mlog_errno(-EINVAL);
781 return -EINVAL;
782 }
783
784 inode_lock(alloc_inode);
785
786 status = ocfs2_inode_lock(alloc_inode, &bh, 1);
787 if (status < 0) {
788 inode_unlock(alloc_inode);
789 iput(alloc_inode);
790
791 mlog_errno(status);
792 return status;
793 }
794
795 ac->ac_inode = alloc_inode;
796 ac->ac_alloc_slot = slot;
797
798 fe = (struct ocfs2_dinode *) bh->b_data;
799
800 /* The bh was validated by the inode read inside
801 * ocfs2_inode_lock(). Any corruption is a code bug. */
802 BUG_ON(!OCFS2_IS_VALID_DINODE(fe));
803
804 if (!(fe->i_flags & cpu_to_le32(OCFS2_CHAIN_FL))) {
805 status = ocfs2_error(alloc_inode->i_sb,
806 "Invalid chain allocator %llu\n",
807 (unsigned long long)le64_to_cpu(fe->i_blkno));
808 goto bail;
809 }
810
811 free_bits = le32_to_cpu(fe->id1.bitmap1.i_total) -
812 le32_to_cpu(fe->id1.bitmap1.i_used);
813
814 if (bits_wanted > free_bits) {
815 /* cluster bitmap never grows */
816 if (ocfs2_is_cluster_bitmap(alloc_inode)) {
817 trace_ocfs2_reserve_suballoc_bits_nospc(bits_wanted,
818 free_bits);
819 status = -ENOSPC;
820 goto bail;
821 }
822
823 if (!(flags & ALLOC_NEW_GROUP)) {
824 trace_ocfs2_reserve_suballoc_bits_no_new_group(
825 slot, bits_wanted, free_bits);
826 status = -ENOSPC;
827 goto bail;
828 }
829
830 status = ocfs2_block_group_alloc(osb, alloc_inode, bh,
831 ac->ac_max_block,
832 last_alloc_group, flags);
833 if (status < 0) {
834 if (status != -ENOSPC)
835 mlog_errno(status);
836 goto bail;
837 }
838 atomic_inc(&osb->alloc_stats.bg_extends);
839
840 /* You should never ask for this much metadata */
841 BUG_ON(bits_wanted >
842 (le32_to_cpu(fe->id1.bitmap1.i_total)
843 - le32_to_cpu(fe->id1.bitmap1.i_used)));
844 }
845
846 get_bh(bh);
847 ac->ac_bh = bh;
848bail:
849 brelse(bh);
850
851 if (status)
852 mlog_errno(status);
853 return status;
854}
855
856static void ocfs2_init_inode_steal_slot(struct ocfs2_super *osb)
857{
858 spin_lock(&osb->osb_lock);
859 osb->s_inode_steal_slot = OCFS2_INVALID_SLOT;
860 spin_unlock(&osb->osb_lock);
861 atomic_set(&osb->s_num_inodes_stolen, 0);
862}
863
864static void ocfs2_init_meta_steal_slot(struct ocfs2_super *osb)
865{
866 spin_lock(&osb->osb_lock);
867 osb->s_meta_steal_slot = OCFS2_INVALID_SLOT;
868 spin_unlock(&osb->osb_lock);
869 atomic_set(&osb->s_num_meta_stolen, 0);
870}
871
872void ocfs2_init_steal_slots(struct ocfs2_super *osb)
873{
874 ocfs2_init_inode_steal_slot(osb);
875 ocfs2_init_meta_steal_slot(osb);
876}
877
878static void __ocfs2_set_steal_slot(struct ocfs2_super *osb, int slot, int type)
879{
880 spin_lock(&osb->osb_lock);
881 if (type == INODE_ALLOC_SYSTEM_INODE)
882 osb->s_inode_steal_slot = slot;
883 else if (type == EXTENT_ALLOC_SYSTEM_INODE)
884 osb->s_meta_steal_slot = slot;
885 spin_unlock(&osb->osb_lock);
886}
887
888static int __ocfs2_get_steal_slot(struct ocfs2_super *osb, int type)
889{
890 int slot = OCFS2_INVALID_SLOT;
891
892 spin_lock(&osb->osb_lock);
893 if (type == INODE_ALLOC_SYSTEM_INODE)
894 slot = osb->s_inode_steal_slot;
895 else if (type == EXTENT_ALLOC_SYSTEM_INODE)
896 slot = osb->s_meta_steal_slot;
897 spin_unlock(&osb->osb_lock);
898
899 return slot;
900}
901
902static int ocfs2_get_inode_steal_slot(struct ocfs2_super *osb)
903{
904 return __ocfs2_get_steal_slot(osb, INODE_ALLOC_SYSTEM_INODE);
905}
906
907static int ocfs2_get_meta_steal_slot(struct ocfs2_super *osb)
908{
909 return __ocfs2_get_steal_slot(osb, EXTENT_ALLOC_SYSTEM_INODE);
910}
911
912static int ocfs2_steal_resource(struct ocfs2_super *osb,
913 struct ocfs2_alloc_context *ac,
914 int type)
915{
916 int i, status = -ENOSPC;
917 int slot = __ocfs2_get_steal_slot(osb, type);
918
919 /* Start to steal resource from the first slot after ours. */
920 if (slot == OCFS2_INVALID_SLOT)
921 slot = osb->slot_num + 1;
922
923 for (i = 0; i < osb->max_slots; i++, slot++) {
924 if (slot == osb->max_slots)
925 slot = 0;
926
927 if (slot == osb->slot_num)
928 continue;
929
930 status = ocfs2_reserve_suballoc_bits(osb, ac,
931 type,
932 (u32)slot, NULL,
933 NOT_ALLOC_NEW_GROUP);
934 if (status >= 0) {
935 __ocfs2_set_steal_slot(osb, slot, type);
936 break;
937 }
938
939 ocfs2_free_ac_resource(ac);
940 }
941
942 return status;
943}
944
945static int ocfs2_steal_inode(struct ocfs2_super *osb,
946 struct ocfs2_alloc_context *ac)
947{
948 return ocfs2_steal_resource(osb, ac, INODE_ALLOC_SYSTEM_INODE);
949}
950
951static int ocfs2_steal_meta(struct ocfs2_super *osb,
952 struct ocfs2_alloc_context *ac)
953{
954 return ocfs2_steal_resource(osb, ac, EXTENT_ALLOC_SYSTEM_INODE);
955}
956
957int ocfs2_reserve_new_metadata_blocks(struct ocfs2_super *osb,
958 int blocks,
959 struct ocfs2_alloc_context **ac)
960{
961 int status;
962 int slot = ocfs2_get_meta_steal_slot(osb);
963
964 *ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
965 if (!(*ac)) {
966 status = -ENOMEM;
967 mlog_errno(status);
968 goto bail;
969 }
970
971 (*ac)->ac_bits_wanted = blocks;
972 (*ac)->ac_which = OCFS2_AC_USE_META;
973 (*ac)->ac_group_search = ocfs2_block_group_search;
974
975 if (slot != OCFS2_INVALID_SLOT &&
976 atomic_read(&osb->s_num_meta_stolen) < OCFS2_MAX_TO_STEAL)
977 goto extent_steal;
978
979 atomic_set(&osb->s_num_meta_stolen, 0);
980 status = ocfs2_reserve_suballoc_bits(osb, (*ac),
981 EXTENT_ALLOC_SYSTEM_INODE,
982 (u32)osb->slot_num, NULL,
983 ALLOC_GROUPS_FROM_GLOBAL|ALLOC_NEW_GROUP);
984
985
986 if (status >= 0) {
987 status = 0;
988 if (slot != OCFS2_INVALID_SLOT)
989 ocfs2_init_meta_steal_slot(osb);
990 goto bail;
991 } else if (status < 0 && status != -ENOSPC) {
992 mlog_errno(status);
993 goto bail;
994 }
995
996 ocfs2_free_ac_resource(*ac);
997
998extent_steal:
999 status = ocfs2_steal_meta(osb, *ac);
1000 atomic_inc(&osb->s_num_meta_stolen);
1001 if (status < 0) {
1002 if (status != -ENOSPC)
1003 mlog_errno(status);
1004 goto bail;
1005 }
1006
1007 status = 0;
1008bail:
1009 if ((status < 0) && *ac) {
1010 ocfs2_free_alloc_context(*ac);
1011 *ac = NULL;
1012 }
1013
1014 if (status)
1015 mlog_errno(status);
1016 return status;
1017}
1018
1019int ocfs2_reserve_new_metadata(struct ocfs2_super *osb,
1020 struct ocfs2_extent_list *root_el,
1021 struct ocfs2_alloc_context **ac)
1022{
1023 return ocfs2_reserve_new_metadata_blocks(osb,
1024 ocfs2_extend_meta_needed(root_el),
1025 ac);
1026}
1027
1028int ocfs2_reserve_new_inode(struct ocfs2_super *osb,
1029 struct ocfs2_alloc_context **ac)
1030{
1031 int status;
1032 int slot = ocfs2_get_inode_steal_slot(osb);
1033 u64 alloc_group;
1034
1035 *ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
1036 if (!(*ac)) {
1037 status = -ENOMEM;
1038 mlog_errno(status);
1039 goto bail;
1040 }
1041
1042 (*ac)->ac_bits_wanted = 1;
1043 (*ac)->ac_which = OCFS2_AC_USE_INODE;
1044
1045 (*ac)->ac_group_search = ocfs2_block_group_search;
1046
1047 /*
1048 * stat(2) can't handle i_ino > 32bits, so we tell the
1049 * lower levels not to allocate us a block group past that
1050 * limit. The 'inode64' mount option avoids this behavior.
1051 */
1052 if (!(osb->s_mount_opt & OCFS2_MOUNT_INODE64))
1053 (*ac)->ac_max_block = (u32)~0U;
1054
1055 /*
1056 * slot is set when we successfully steal inode from other nodes.
1057 * It is reset in 3 places:
1058 * 1. when we flush the truncate log
1059 * 2. when we complete local alloc recovery.
1060 * 3. when we successfully allocate from our own slot.
1061 * After it is set, we will go on stealing inodes until we find the
1062 * need to check our slots to see whether there is some space for us.
1063 */
1064 if (slot != OCFS2_INVALID_SLOT &&
1065 atomic_read(&osb->s_num_inodes_stolen) < OCFS2_MAX_TO_STEAL)
1066 goto inode_steal;
1067
1068 atomic_set(&osb->s_num_inodes_stolen, 0);
1069 alloc_group = osb->osb_inode_alloc_group;
1070 status = ocfs2_reserve_suballoc_bits(osb, *ac,
1071 INODE_ALLOC_SYSTEM_INODE,
1072 (u32)osb->slot_num,
1073 &alloc_group,
1074 ALLOC_NEW_GROUP |
1075 ALLOC_GROUPS_FROM_GLOBAL);
1076 if (status >= 0) {
1077 status = 0;
1078
1079 spin_lock(&osb->osb_lock);
1080 osb->osb_inode_alloc_group = alloc_group;
1081 spin_unlock(&osb->osb_lock);
1082 trace_ocfs2_reserve_new_inode_new_group(
1083 (unsigned long long)alloc_group);
1084
1085 /*
1086 * Some inodes must be freed by us, so try to allocate
1087 * from our own next time.
1088 */
1089 if (slot != OCFS2_INVALID_SLOT)
1090 ocfs2_init_inode_steal_slot(osb);
1091 goto bail;
1092 } else if (status < 0 && status != -ENOSPC) {
1093 mlog_errno(status);
1094 goto bail;
1095 }
1096
1097 ocfs2_free_ac_resource(*ac);
1098
1099inode_steal:
1100 status = ocfs2_steal_inode(osb, *ac);
1101 atomic_inc(&osb->s_num_inodes_stolen);
1102 if (status < 0) {
1103 if (status != -ENOSPC)
1104 mlog_errno(status);
1105 goto bail;
1106 }
1107
1108 status = 0;
1109bail:
1110 if ((status < 0) && *ac) {
1111 ocfs2_free_alloc_context(*ac);
1112 *ac = NULL;
1113 }
1114
1115 if (status)
1116 mlog_errno(status);
1117 return status;
1118}
1119
1120/* local alloc code has to do the same thing, so rather than do this
1121 * twice.. */
1122int ocfs2_reserve_cluster_bitmap_bits(struct ocfs2_super *osb,
1123 struct ocfs2_alloc_context *ac)
1124{
1125 int status;
1126
1127 ac->ac_which = OCFS2_AC_USE_MAIN;
1128 ac->ac_group_search = ocfs2_cluster_group_search;
1129
1130 status = ocfs2_reserve_suballoc_bits(osb, ac,
1131 GLOBAL_BITMAP_SYSTEM_INODE,
1132 OCFS2_INVALID_SLOT, NULL,
1133 ALLOC_NEW_GROUP);
1134 if (status < 0 && status != -ENOSPC)
1135 mlog_errno(status);
1136
1137 return status;
1138}
1139
1140/* Callers don't need to care which bitmap (local alloc or main) to
1141 * use so we figure it out for them, but unfortunately this clutters
1142 * things a bit. */
1143static int ocfs2_reserve_clusters_with_limit(struct ocfs2_super *osb,
1144 u32 bits_wanted, u64 max_block,
1145 int flags,
1146 struct ocfs2_alloc_context **ac)
1147{
1148 int status, ret = 0;
1149 int retried = 0;
1150
1151 *ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
1152 if (!(*ac)) {
1153 status = -ENOMEM;
1154 mlog_errno(status);
1155 goto bail;
1156 }
1157
1158 (*ac)->ac_bits_wanted = bits_wanted;
1159 (*ac)->ac_max_block = max_block;
1160
1161 status = -ENOSPC;
1162 if (!(flags & ALLOC_GROUPS_FROM_GLOBAL) &&
1163 ocfs2_alloc_should_use_local(osb, bits_wanted)) {
1164 status = ocfs2_reserve_local_alloc_bits(osb,
1165 bits_wanted,
1166 *ac);
1167 if ((status < 0) && (status != -ENOSPC)) {
1168 mlog_errno(status);
1169 goto bail;
1170 }
1171 }
1172
1173 if (status == -ENOSPC) {
1174retry:
1175 status = ocfs2_reserve_cluster_bitmap_bits(osb, *ac);
1176 /* Retry if there is sufficient space cached in truncate log */
1177 if (status == -ENOSPC && !retried) {
1178 retried = 1;
1179 ocfs2_inode_unlock((*ac)->ac_inode, 1);
1180 inode_unlock((*ac)->ac_inode);
1181
1182 ret = ocfs2_try_to_free_truncate_log(osb, bits_wanted);
1183 if (ret == 1) {
1184 iput((*ac)->ac_inode);
1185 (*ac)->ac_inode = NULL;
1186 goto retry;
1187 }
1188
1189 if (ret < 0)
1190 mlog_errno(ret);
1191
1192 inode_lock((*ac)->ac_inode);
1193 ret = ocfs2_inode_lock((*ac)->ac_inode, NULL, 1);
1194 if (ret < 0) {
1195 mlog_errno(ret);
1196 inode_unlock((*ac)->ac_inode);
1197 iput((*ac)->ac_inode);
1198 (*ac)->ac_inode = NULL;
1199 goto bail;
1200 }
1201 }
1202 if (status < 0) {
1203 if (status != -ENOSPC)
1204 mlog_errno(status);
1205 goto bail;
1206 }
1207 }
1208
1209 status = 0;
1210bail:
1211 if ((status < 0) && *ac) {
1212 ocfs2_free_alloc_context(*ac);
1213 *ac = NULL;
1214 }
1215
1216 if (status)
1217 mlog_errno(status);
1218 return status;
1219}
1220
1221int ocfs2_reserve_clusters(struct ocfs2_super *osb,
1222 u32 bits_wanted,
1223 struct ocfs2_alloc_context **ac)
1224{
1225 return ocfs2_reserve_clusters_with_limit(osb, bits_wanted, 0,
1226 ALLOC_NEW_GROUP, ac);
1227}
1228
1229/*
1230 * More or less lifted from ext3. I'll leave their description below:
1231 *
1232 * "For ext3 allocations, we must not reuse any blocks which are
1233 * allocated in the bitmap buffer's "last committed data" copy. This
1234 * prevents deletes from freeing up the page for reuse until we have
1235 * committed the delete transaction.
1236 *
1237 * If we didn't do this, then deleting something and reallocating it as
1238 * data would allow the old block to be overwritten before the
1239 * transaction committed (because we force data to disk before commit).
1240 * This would lead to corruption if we crashed between overwriting the
1241 * data and committing the delete.
1242 *
1243 * @@@ We may want to make this allocation behaviour conditional on
1244 * data-writes at some point, and disable it for metadata allocations or
1245 * sync-data inodes."
1246 *
1247 * Note: OCFS2 already does this differently for metadata vs data
1248 * allocations, as those bitmaps are separate and undo access is never
1249 * called on a metadata group descriptor.
1250 */
1251static int ocfs2_test_bg_bit_allocatable(struct buffer_head *bg_bh,
1252 int nr)
1253{
1254 struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data;
1255 int ret;
1256
1257 if (ocfs2_test_bit(nr, (unsigned long *)bg->bg_bitmap))
1258 return 0;
1259
1260 if (!buffer_jbd(bg_bh))
1261 return 1;
1262
1263 jbd_lock_bh_state(bg_bh);
1264 bg = (struct ocfs2_group_desc *) bh2jh(bg_bh)->b_committed_data;
1265 if (bg)
1266 ret = !ocfs2_test_bit(nr, (unsigned long *)bg->bg_bitmap);
1267 else
1268 ret = 1;
1269 jbd_unlock_bh_state(bg_bh);
1270
1271 return ret;
1272}
1273
1274static int ocfs2_block_group_find_clear_bits(struct ocfs2_super *osb,
1275 struct buffer_head *bg_bh,
1276 unsigned int bits_wanted,
1277 unsigned int total_bits,
1278 struct ocfs2_suballoc_result *res)
1279{
1280 void *bitmap;
1281 u16 best_offset, best_size;
1282 int offset, start, found, status = 0;
1283 struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data;
1284
1285 /* Callers got this descriptor from
1286 * ocfs2_read_group_descriptor(). Any corruption is a code bug. */
1287 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
1288
1289 found = start = best_offset = best_size = 0;
1290 bitmap = bg->bg_bitmap;
1291
1292 while((offset = ocfs2_find_next_zero_bit(bitmap, total_bits, start)) != -1) {
1293 if (offset == total_bits)
1294 break;
1295
1296 if (!ocfs2_test_bg_bit_allocatable(bg_bh, offset)) {
1297 /* We found a zero, but we can't use it as it
1298 * hasn't been put to disk yet! */
1299 found = 0;
1300 start = offset + 1;
1301 } else if (offset == start) {
1302 /* we found a zero */
1303 found++;
1304 /* move start to the next bit to test */
1305 start++;
1306 } else {
1307 /* got a zero after some ones */
1308 found = 1;
1309 start = offset + 1;
1310 }
1311 if (found > best_size) {
1312 best_size = found;
1313 best_offset = start - found;
1314 }
1315 /* we got everything we needed */
1316 if (found == bits_wanted) {
1317 /* mlog(0, "Found it all!\n"); */
1318 break;
1319 }
1320 }
1321
1322 if (best_size) {
1323 res->sr_bit_offset = best_offset;
1324 res->sr_bits = best_size;
1325 } else {
1326 status = -ENOSPC;
1327 /* No error log here -- see the comment above
1328 * ocfs2_test_bg_bit_allocatable */
1329 }
1330
1331 return status;
1332}
1333
1334int ocfs2_block_group_set_bits(handle_t *handle,
1335 struct inode *alloc_inode,
1336 struct ocfs2_group_desc *bg,
1337 struct buffer_head *group_bh,
1338 unsigned int bit_off,
1339 unsigned int num_bits)
1340{
1341 int status;
1342 void *bitmap = bg->bg_bitmap;
1343 int journal_type = OCFS2_JOURNAL_ACCESS_WRITE;
1344
1345 /* All callers get the descriptor via
1346 * ocfs2_read_group_descriptor(). Any corruption is a code bug. */
1347 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
1348 BUG_ON(le16_to_cpu(bg->bg_free_bits_count) < num_bits);
1349
1350 trace_ocfs2_block_group_set_bits(bit_off, num_bits);
1351
1352 if (ocfs2_is_cluster_bitmap(alloc_inode))
1353 journal_type = OCFS2_JOURNAL_ACCESS_UNDO;
1354
1355 status = ocfs2_journal_access_gd(handle,
1356 INODE_CACHE(alloc_inode),
1357 group_bh,
1358 journal_type);
1359 if (status < 0) {
1360 mlog_errno(status);
1361 goto bail;
1362 }
1363
1364 le16_add_cpu(&bg->bg_free_bits_count, -num_bits);
1365 if (le16_to_cpu(bg->bg_free_bits_count) > le16_to_cpu(bg->bg_bits)) {
1366 return ocfs2_error(alloc_inode->i_sb, "Group descriptor # %llu has bit count %u but claims %u are freed. num_bits %d\n",
1367 (unsigned long long)le64_to_cpu(bg->bg_blkno),
1368 le16_to_cpu(bg->bg_bits),
1369 le16_to_cpu(bg->bg_free_bits_count),
1370 num_bits);
1371 }
1372 while(num_bits--)
1373 ocfs2_set_bit(bit_off++, bitmap);
1374
1375 ocfs2_journal_dirty(handle, group_bh);
1376
1377bail:
1378 return status;
1379}
1380
1381/* find the one with the most empty bits */
1382static inline u16 ocfs2_find_victim_chain(struct ocfs2_chain_list *cl)
1383{
1384 u16 curr, best;
1385
1386 BUG_ON(!cl->cl_next_free_rec);
1387
1388 best = curr = 0;
1389 while (curr < le16_to_cpu(cl->cl_next_free_rec)) {
1390 if (le32_to_cpu(cl->cl_recs[curr].c_free) >
1391 le32_to_cpu(cl->cl_recs[best].c_free))
1392 best = curr;
1393 curr++;
1394 }
1395
1396 BUG_ON(best >= le16_to_cpu(cl->cl_next_free_rec));
1397 return best;
1398}
1399
1400static int ocfs2_relink_block_group(handle_t *handle,
1401 struct inode *alloc_inode,
1402 struct buffer_head *fe_bh,
1403 struct buffer_head *bg_bh,
1404 struct buffer_head *prev_bg_bh,
1405 u16 chain)
1406{
1407 int status;
1408 /* there is a really tiny chance the journal calls could fail,
1409 * but we wouldn't want inconsistent blocks in *any* case. */
1410 u64 bg_ptr, prev_bg_ptr;
1411 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) fe_bh->b_data;
1412 struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data;
1413 struct ocfs2_group_desc *prev_bg = (struct ocfs2_group_desc *) prev_bg_bh->b_data;
1414
1415 /* The caller got these descriptors from
1416 * ocfs2_read_group_descriptor(). Any corruption is a code bug. */
1417 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
1418 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(prev_bg));
1419
1420 trace_ocfs2_relink_block_group(
1421 (unsigned long long)le64_to_cpu(fe->i_blkno), chain,
1422 (unsigned long long)le64_to_cpu(bg->bg_blkno),
1423 (unsigned long long)le64_to_cpu(prev_bg->bg_blkno));
1424
1425 bg_ptr = le64_to_cpu(bg->bg_next_group);
1426 prev_bg_ptr = le64_to_cpu(prev_bg->bg_next_group);
1427
1428 status = ocfs2_journal_access_gd(handle, INODE_CACHE(alloc_inode),
1429 prev_bg_bh,
1430 OCFS2_JOURNAL_ACCESS_WRITE);
1431 if (status < 0)
1432 goto out;
1433
1434 prev_bg->bg_next_group = bg->bg_next_group;
1435 ocfs2_journal_dirty(handle, prev_bg_bh);
1436
1437 status = ocfs2_journal_access_gd(handle, INODE_CACHE(alloc_inode),
1438 bg_bh, OCFS2_JOURNAL_ACCESS_WRITE);
1439 if (status < 0)
1440 goto out_rollback_prev_bg;
1441
1442 bg->bg_next_group = fe->id2.i_chain.cl_recs[chain].c_blkno;
1443 ocfs2_journal_dirty(handle, bg_bh);
1444
1445 status = ocfs2_journal_access_di(handle, INODE_CACHE(alloc_inode),
1446 fe_bh, OCFS2_JOURNAL_ACCESS_WRITE);
1447 if (status < 0)
1448 goto out_rollback_bg;
1449
1450 fe->id2.i_chain.cl_recs[chain].c_blkno = bg->bg_blkno;
1451 ocfs2_journal_dirty(handle, fe_bh);
1452
1453out:
1454 if (status < 0)
1455 mlog_errno(status);
1456 return status;
1457
1458out_rollback_bg:
1459 bg->bg_next_group = cpu_to_le64(bg_ptr);
1460out_rollback_prev_bg:
1461 prev_bg->bg_next_group = cpu_to_le64(prev_bg_ptr);
1462 goto out;
1463}
1464
1465static inline int ocfs2_block_group_reasonably_empty(struct ocfs2_group_desc *bg,
1466 u32 wanted)
1467{
1468 return le16_to_cpu(bg->bg_free_bits_count) > wanted;
1469}
1470
1471/* return 0 on success, -ENOSPC to keep searching and any other < 0
1472 * value on error. */
1473static int ocfs2_cluster_group_search(struct inode *inode,
1474 struct buffer_head *group_bh,
1475 u32 bits_wanted, u32 min_bits,
1476 u64 max_block,
1477 struct ocfs2_suballoc_result *res)
1478{
1479 int search = -ENOSPC;
1480 int ret;
1481 u64 blkoff;
1482 struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *) group_bh->b_data;
1483 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1484 unsigned int max_bits, gd_cluster_off;
1485
1486 BUG_ON(!ocfs2_is_cluster_bitmap(inode));
1487
1488 if (gd->bg_free_bits_count) {
1489 max_bits = le16_to_cpu(gd->bg_bits);
1490
1491 /* Tail groups in cluster bitmaps which aren't cpg
1492 * aligned are prone to partial extension by a failed
1493 * fs resize. If the file system resize never got to
1494 * update the dinode cluster count, then we don't want
1495 * to trust any clusters past it, regardless of what
1496 * the group descriptor says. */
1497 gd_cluster_off = ocfs2_blocks_to_clusters(inode->i_sb,
1498 le64_to_cpu(gd->bg_blkno));
1499 if ((gd_cluster_off + max_bits) >
1500 OCFS2_I(inode)->ip_clusters) {
1501 max_bits = OCFS2_I(inode)->ip_clusters - gd_cluster_off;
1502 trace_ocfs2_cluster_group_search_wrong_max_bits(
1503 (unsigned long long)le64_to_cpu(gd->bg_blkno),
1504 le16_to_cpu(gd->bg_bits),
1505 OCFS2_I(inode)->ip_clusters, max_bits);
1506 }
1507
1508 ret = ocfs2_block_group_find_clear_bits(osb,
1509 group_bh, bits_wanted,
1510 max_bits, res);
1511 if (ret)
1512 return ret;
1513
1514 if (max_block) {
1515 blkoff = ocfs2_clusters_to_blocks(inode->i_sb,
1516 gd_cluster_off +
1517 res->sr_bit_offset +
1518 res->sr_bits);
1519 trace_ocfs2_cluster_group_search_max_block(
1520 (unsigned long long)blkoff,
1521 (unsigned long long)max_block);
1522 if (blkoff > max_block)
1523 return -ENOSPC;
1524 }
1525
1526 /* ocfs2_block_group_find_clear_bits() might
1527 * return success, but we still want to return
1528 * -ENOSPC unless it found the minimum number
1529 * of bits. */
1530 if (min_bits <= res->sr_bits)
1531 search = 0; /* success */
1532 else if (res->sr_bits) {
1533 /*
1534 * Don't show bits which we'll be returning
1535 * for allocation to the local alloc bitmap.
1536 */
1537 ocfs2_local_alloc_seen_free_bits(osb, res->sr_bits);
1538 }
1539 }
1540
1541 return search;
1542}
1543
1544static int ocfs2_block_group_search(struct inode *inode,
1545 struct buffer_head *group_bh,
1546 u32 bits_wanted, u32 min_bits,
1547 u64 max_block,
1548 struct ocfs2_suballoc_result *res)
1549{
1550 int ret = -ENOSPC;
1551 u64 blkoff;
1552 struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) group_bh->b_data;
1553
1554 BUG_ON(min_bits != 1);
1555 BUG_ON(ocfs2_is_cluster_bitmap(inode));
1556
1557 if (bg->bg_free_bits_count) {
1558 ret = ocfs2_block_group_find_clear_bits(OCFS2_SB(inode->i_sb),
1559 group_bh, bits_wanted,
1560 le16_to_cpu(bg->bg_bits),
1561 res);
1562 if (!ret && max_block) {
1563 blkoff = le64_to_cpu(bg->bg_blkno) +
1564 res->sr_bit_offset + res->sr_bits;
1565 trace_ocfs2_block_group_search_max_block(
1566 (unsigned long long)blkoff,
1567 (unsigned long long)max_block);
1568 if (blkoff > max_block)
1569 ret = -ENOSPC;
1570 }
1571 }
1572
1573 return ret;
1574}
1575
1576int ocfs2_alloc_dinode_update_counts(struct inode *inode,
1577 handle_t *handle,
1578 struct buffer_head *di_bh,
1579 u32 num_bits,
1580 u16 chain)
1581{
1582 int ret;
1583 u32 tmp_used;
1584 struct ocfs2_dinode *di = (struct ocfs2_dinode *) di_bh->b_data;
1585 struct ocfs2_chain_list *cl = (struct ocfs2_chain_list *) &di->id2.i_chain;
1586
1587 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
1588 OCFS2_JOURNAL_ACCESS_WRITE);
1589 if (ret < 0) {
1590 mlog_errno(ret);
1591 goto out;
1592 }
1593
1594 tmp_used = le32_to_cpu(di->id1.bitmap1.i_used);
1595 di->id1.bitmap1.i_used = cpu_to_le32(num_bits + tmp_used);
1596 le32_add_cpu(&cl->cl_recs[chain].c_free, -num_bits);
1597 ocfs2_journal_dirty(handle, di_bh);
1598
1599out:
1600 return ret;
1601}
1602
1603void ocfs2_rollback_alloc_dinode_counts(struct inode *inode,
1604 struct buffer_head *di_bh,
1605 u32 num_bits,
1606 u16 chain)
1607{
1608 u32 tmp_used;
1609 struct ocfs2_dinode *di = (struct ocfs2_dinode *) di_bh->b_data;
1610 struct ocfs2_chain_list *cl;
1611
1612 cl = (struct ocfs2_chain_list *)&di->id2.i_chain;
1613 tmp_used = le32_to_cpu(di->id1.bitmap1.i_used);
1614 di->id1.bitmap1.i_used = cpu_to_le32(tmp_used - num_bits);
1615 le32_add_cpu(&cl->cl_recs[chain].c_free, num_bits);
1616}
1617
1618static int ocfs2_bg_discontig_fix_by_rec(struct ocfs2_suballoc_result *res,
1619 struct ocfs2_extent_rec *rec,
1620 struct ocfs2_chain_list *cl)
1621{
1622 unsigned int bpc = le16_to_cpu(cl->cl_bpc);
1623 unsigned int bitoff = le32_to_cpu(rec->e_cpos) * bpc;
1624 unsigned int bitcount = le16_to_cpu(rec->e_leaf_clusters) * bpc;
1625
1626 if (res->sr_bit_offset < bitoff)
1627 return 0;
1628 if (res->sr_bit_offset >= (bitoff + bitcount))
1629 return 0;
1630 res->sr_blkno = le64_to_cpu(rec->e_blkno) +
1631 (res->sr_bit_offset - bitoff);
1632 if ((res->sr_bit_offset + res->sr_bits) > (bitoff + bitcount))
1633 res->sr_bits = (bitoff + bitcount) - res->sr_bit_offset;
1634 return 1;
1635}
1636
1637static void ocfs2_bg_discontig_fix_result(struct ocfs2_alloc_context *ac,
1638 struct ocfs2_group_desc *bg,
1639 struct ocfs2_suballoc_result *res)
1640{
1641 int i;
1642 u64 bg_blkno = res->sr_bg_blkno; /* Save off */
1643 struct ocfs2_extent_rec *rec;
1644 struct ocfs2_dinode *di = (struct ocfs2_dinode *)ac->ac_bh->b_data;
1645 struct ocfs2_chain_list *cl = &di->id2.i_chain;
1646
1647 if (ocfs2_is_cluster_bitmap(ac->ac_inode)) {
1648 res->sr_blkno = 0;
1649 return;
1650 }
1651
1652 res->sr_blkno = res->sr_bg_blkno + res->sr_bit_offset;
1653 res->sr_bg_blkno = 0; /* Clear it for contig block groups */
1654 if (!ocfs2_supports_discontig_bg(OCFS2_SB(ac->ac_inode->i_sb)) ||
1655 !bg->bg_list.l_next_free_rec)
1656 return;
1657
1658 for (i = 0; i < le16_to_cpu(bg->bg_list.l_next_free_rec); i++) {
1659 rec = &bg->bg_list.l_recs[i];
1660 if (ocfs2_bg_discontig_fix_by_rec(res, rec, cl)) {
1661 res->sr_bg_blkno = bg_blkno; /* Restore */
1662 break;
1663 }
1664 }
1665}
1666
1667static int ocfs2_search_one_group(struct ocfs2_alloc_context *ac,
1668 handle_t *handle,
1669 u32 bits_wanted,
1670 u32 min_bits,
1671 struct ocfs2_suballoc_result *res,
1672 u16 *bits_left)
1673{
1674 int ret;
1675 struct buffer_head *group_bh = NULL;
1676 struct ocfs2_group_desc *gd;
1677 struct ocfs2_dinode *di = (struct ocfs2_dinode *)ac->ac_bh->b_data;
1678 struct inode *alloc_inode = ac->ac_inode;
1679
1680 ret = ocfs2_read_group_descriptor(alloc_inode, di,
1681 res->sr_bg_blkno, &group_bh);
1682 if (ret < 0) {
1683 mlog_errno(ret);
1684 return ret;
1685 }
1686
1687 gd = (struct ocfs2_group_desc *) group_bh->b_data;
1688 ret = ac->ac_group_search(alloc_inode, group_bh, bits_wanted, min_bits,
1689 ac->ac_max_block, res);
1690 if (ret < 0) {
1691 if (ret != -ENOSPC)
1692 mlog_errno(ret);
1693 goto out;
1694 }
1695
1696 if (!ret)
1697 ocfs2_bg_discontig_fix_result(ac, gd, res);
1698
1699 /*
1700 * sr_bg_blkno might have been changed by
1701 * ocfs2_bg_discontig_fix_result
1702 */
1703 res->sr_bg_stable_blkno = group_bh->b_blocknr;
1704
1705 if (ac->ac_find_loc_only)
1706 goto out_loc_only;
1707
1708 ret = ocfs2_alloc_dinode_update_counts(alloc_inode, handle, ac->ac_bh,
1709 res->sr_bits,
1710 le16_to_cpu(gd->bg_chain));
1711 if (ret < 0) {
1712 mlog_errno(ret);
1713 goto out;
1714 }
1715
1716 ret = ocfs2_block_group_set_bits(handle, alloc_inode, gd, group_bh,
1717 res->sr_bit_offset, res->sr_bits);
1718 if (ret < 0) {
1719 ocfs2_rollback_alloc_dinode_counts(alloc_inode, ac->ac_bh,
1720 res->sr_bits,
1721 le16_to_cpu(gd->bg_chain));
1722 mlog_errno(ret);
1723 }
1724
1725out_loc_only:
1726 *bits_left = le16_to_cpu(gd->bg_free_bits_count);
1727
1728out:
1729 brelse(group_bh);
1730
1731 return ret;
1732}
1733
1734static int ocfs2_search_chain(struct ocfs2_alloc_context *ac,
1735 handle_t *handle,
1736 u32 bits_wanted,
1737 u32 min_bits,
1738 struct ocfs2_suballoc_result *res,
1739 u16 *bits_left)
1740{
1741 int status;
1742 u16 chain;
1743 u64 next_group;
1744 struct inode *alloc_inode = ac->ac_inode;
1745 struct buffer_head *group_bh = NULL;
1746 struct buffer_head *prev_group_bh = NULL;
1747 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) ac->ac_bh->b_data;
1748 struct ocfs2_chain_list *cl = (struct ocfs2_chain_list *) &fe->id2.i_chain;
1749 struct ocfs2_group_desc *bg;
1750
1751 chain = ac->ac_chain;
1752 trace_ocfs2_search_chain_begin(
1753 (unsigned long long)OCFS2_I(alloc_inode)->ip_blkno,
1754 bits_wanted, chain);
1755
1756 status = ocfs2_read_group_descriptor(alloc_inode, fe,
1757 le64_to_cpu(cl->cl_recs[chain].c_blkno),
1758 &group_bh);
1759 if (status < 0) {
1760 mlog_errno(status);
1761 goto bail;
1762 }
1763 bg = (struct ocfs2_group_desc *) group_bh->b_data;
1764
1765 status = -ENOSPC;
1766 /* for now, the chain search is a bit simplistic. We just use
1767 * the 1st group with any empty bits. */
1768 while ((status = ac->ac_group_search(alloc_inode, group_bh,
1769 bits_wanted, min_bits,
1770 ac->ac_max_block,
1771 res)) == -ENOSPC) {
1772 if (!bg->bg_next_group)
1773 break;
1774
1775 brelse(prev_group_bh);
1776 prev_group_bh = NULL;
1777
1778 next_group = le64_to_cpu(bg->bg_next_group);
1779 prev_group_bh = group_bh;
1780 group_bh = NULL;
1781 status = ocfs2_read_group_descriptor(alloc_inode, fe,
1782 next_group, &group_bh);
1783 if (status < 0) {
1784 mlog_errno(status);
1785 goto bail;
1786 }
1787 bg = (struct ocfs2_group_desc *) group_bh->b_data;
1788 }
1789 if (status < 0) {
1790 if (status != -ENOSPC)
1791 mlog_errno(status);
1792 goto bail;
1793 }
1794
1795 trace_ocfs2_search_chain_succ(
1796 (unsigned long long)le64_to_cpu(bg->bg_blkno), res->sr_bits);
1797
1798 res->sr_bg_blkno = le64_to_cpu(bg->bg_blkno);
1799
1800 BUG_ON(res->sr_bits == 0);
1801 if (!status)
1802 ocfs2_bg_discontig_fix_result(ac, bg, res);
1803
1804 /*
1805 * sr_bg_blkno might have been changed by
1806 * ocfs2_bg_discontig_fix_result
1807 */
1808 res->sr_bg_stable_blkno = group_bh->b_blocknr;
1809
1810 /*
1811 * Keep track of previous block descriptor read. When
1812 * we find a target, if we have read more than X
1813 * number of descriptors, and the target is reasonably
1814 * empty, relink him to top of his chain.
1815 *
1816 * We've read 0 extra blocks and only send one more to
1817 * the transaction, yet the next guy to search has a
1818 * much easier time.
1819 *
1820 * Do this *after* figuring out how many bits we're taking out
1821 * of our target group.
1822 */
1823 if (!ac->ac_disable_chain_relink &&
1824 (prev_group_bh) &&
1825 (ocfs2_block_group_reasonably_empty(bg, res->sr_bits))) {
1826 status = ocfs2_relink_block_group(handle, alloc_inode,
1827 ac->ac_bh, group_bh,
1828 prev_group_bh, chain);
1829 if (status < 0) {
1830 mlog_errno(status);
1831 goto bail;
1832 }
1833 }
1834
1835 if (ac->ac_find_loc_only)
1836 goto out_loc_only;
1837
1838 status = ocfs2_alloc_dinode_update_counts(alloc_inode, handle,
1839 ac->ac_bh, res->sr_bits,
1840 chain);
1841 if (status) {
1842 mlog_errno(status);
1843 goto bail;
1844 }
1845
1846 status = ocfs2_block_group_set_bits(handle,
1847 alloc_inode,
1848 bg,
1849 group_bh,
1850 res->sr_bit_offset,
1851 res->sr_bits);
1852 if (status < 0) {
1853 ocfs2_rollback_alloc_dinode_counts(alloc_inode,
1854 ac->ac_bh, res->sr_bits, chain);
1855 mlog_errno(status);
1856 goto bail;
1857 }
1858
1859 trace_ocfs2_search_chain_end(
1860 (unsigned long long)le64_to_cpu(fe->i_blkno),
1861 res->sr_bits);
1862
1863out_loc_only:
1864 *bits_left = le16_to_cpu(bg->bg_free_bits_count);
1865bail:
1866 brelse(group_bh);
1867 brelse(prev_group_bh);
1868
1869 if (status)
1870 mlog_errno(status);
1871 return status;
1872}
1873
1874/* will give out up to bits_wanted contiguous bits. */
1875static int ocfs2_claim_suballoc_bits(struct ocfs2_alloc_context *ac,
1876 handle_t *handle,
1877 u32 bits_wanted,
1878 u32 min_bits,
1879 struct ocfs2_suballoc_result *res)
1880{
1881 int status;
1882 u16 victim, i;
1883 u16 bits_left = 0;
1884 u64 hint = ac->ac_last_group;
1885 struct ocfs2_chain_list *cl;
1886 struct ocfs2_dinode *fe;
1887
1888 BUG_ON(ac->ac_bits_given >= ac->ac_bits_wanted);
1889 BUG_ON(bits_wanted > (ac->ac_bits_wanted - ac->ac_bits_given));
1890 BUG_ON(!ac->ac_bh);
1891
1892 fe = (struct ocfs2_dinode *) ac->ac_bh->b_data;
1893
1894 /* The bh was validated by the inode read during
1895 * ocfs2_reserve_suballoc_bits(). Any corruption is a code bug. */
1896 BUG_ON(!OCFS2_IS_VALID_DINODE(fe));
1897
1898 if (le32_to_cpu(fe->id1.bitmap1.i_used) >=
1899 le32_to_cpu(fe->id1.bitmap1.i_total)) {
1900 status = ocfs2_error(ac->ac_inode->i_sb,
1901 "Chain allocator dinode %llu has %u used bits but only %u total\n",
1902 (unsigned long long)le64_to_cpu(fe->i_blkno),
1903 le32_to_cpu(fe->id1.bitmap1.i_used),
1904 le32_to_cpu(fe->id1.bitmap1.i_total));
1905 goto bail;
1906 }
1907
1908 res->sr_bg_blkno = hint;
1909 if (res->sr_bg_blkno) {
1910 /* Attempt to short-circuit the usual search mechanism
1911 * by jumping straight to the most recently used
1912 * allocation group. This helps us maintain some
1913 * contiguousness across allocations. */
1914 status = ocfs2_search_one_group(ac, handle, bits_wanted,
1915 min_bits, res, &bits_left);
1916 if (!status)
1917 goto set_hint;
1918 if (status < 0 && status != -ENOSPC) {
1919 mlog_errno(status);
1920 goto bail;
1921 }
1922 }
1923
1924 cl = (struct ocfs2_chain_list *) &fe->id2.i_chain;
1925
1926 victim = ocfs2_find_victim_chain(cl);
1927 ac->ac_chain = victim;
1928
1929 status = ocfs2_search_chain(ac, handle, bits_wanted, min_bits,
1930 res, &bits_left);
1931 if (!status) {
1932 if (ocfs2_is_cluster_bitmap(ac->ac_inode))
1933 hint = res->sr_bg_blkno;
1934 else
1935 hint = ocfs2_group_from_res(res);
1936 goto set_hint;
1937 }
1938 if (status < 0 && status != -ENOSPC) {
1939 mlog_errno(status);
1940 goto bail;
1941 }
1942
1943 trace_ocfs2_claim_suballoc_bits(victim);
1944
1945 /* If we didn't pick a good victim, then just default to
1946 * searching each chain in order. Don't allow chain relinking
1947 * because we only calculate enough journal credits for one
1948 * relink per alloc. */
1949 ac->ac_disable_chain_relink = 1;
1950 for (i = 0; i < le16_to_cpu(cl->cl_next_free_rec); i ++) {
1951 if (i == victim)
1952 continue;
1953 if (!cl->cl_recs[i].c_free)
1954 continue;
1955
1956 ac->ac_chain = i;
1957 status = ocfs2_search_chain(ac, handle, bits_wanted, min_bits,
1958 res, &bits_left);
1959 if (!status) {
1960 hint = ocfs2_group_from_res(res);
1961 break;
1962 }
1963 if (status < 0 && status != -ENOSPC) {
1964 mlog_errno(status);
1965 goto bail;
1966 }
1967 }
1968
1969set_hint:
1970 if (status != -ENOSPC) {
1971 /* If the next search of this group is not likely to
1972 * yield a suitable extent, then we reset the last
1973 * group hint so as to not waste a disk read */
1974 if (bits_left < min_bits)
1975 ac->ac_last_group = 0;
1976 else
1977 ac->ac_last_group = hint;
1978 }
1979
1980bail:
1981 if (status)
1982 mlog_errno(status);
1983 return status;
1984}
1985
1986int ocfs2_claim_metadata(handle_t *handle,
1987 struct ocfs2_alloc_context *ac,
1988 u32 bits_wanted,
1989 u64 *suballoc_loc,
1990 u16 *suballoc_bit_start,
1991 unsigned int *num_bits,
1992 u64 *blkno_start)
1993{
1994 int status;
1995 struct ocfs2_suballoc_result res = { .sr_blkno = 0, };
1996
1997 BUG_ON(!ac);
1998 BUG_ON(ac->ac_bits_wanted < (ac->ac_bits_given + bits_wanted));
1999 BUG_ON(ac->ac_which != OCFS2_AC_USE_META);
2000
2001 status = ocfs2_claim_suballoc_bits(ac,
2002 handle,
2003 bits_wanted,
2004 1,
2005 &res);
2006 if (status < 0) {
2007 mlog_errno(status);
2008 goto bail;
2009 }
2010 atomic_inc(&OCFS2_SB(ac->ac_inode->i_sb)->alloc_stats.bg_allocs);
2011
2012 *suballoc_loc = res.sr_bg_blkno;
2013 *suballoc_bit_start = res.sr_bit_offset;
2014 *blkno_start = res.sr_blkno;
2015 ac->ac_bits_given += res.sr_bits;
2016 *num_bits = res.sr_bits;
2017 status = 0;
2018bail:
2019 if (status)
2020 mlog_errno(status);
2021 return status;
2022}
2023
2024static void ocfs2_init_inode_ac_group(struct inode *dir,
2025 struct buffer_head *parent_di_bh,
2026 struct ocfs2_alloc_context *ac)
2027{
2028 struct ocfs2_dinode *di = (struct ocfs2_dinode *)parent_di_bh->b_data;
2029 /*
2030 * Try to allocate inodes from some specific group.
2031 *
2032 * If the parent dir has recorded the last group used in allocation,
2033 * cool, use it. Otherwise if we try to allocate new inode from the
2034 * same slot the parent dir belongs to, use the same chunk.
2035 *
2036 * We are very careful here to avoid the mistake of setting
2037 * ac_last_group to a group descriptor from a different (unlocked) slot.
2038 */
2039 if (OCFS2_I(dir)->ip_last_used_group &&
2040 OCFS2_I(dir)->ip_last_used_slot == ac->ac_alloc_slot)
2041 ac->ac_last_group = OCFS2_I(dir)->ip_last_used_group;
2042 else if (le16_to_cpu(di->i_suballoc_slot) == ac->ac_alloc_slot) {
2043 if (di->i_suballoc_loc)
2044 ac->ac_last_group = le64_to_cpu(di->i_suballoc_loc);
2045 else
2046 ac->ac_last_group = ocfs2_which_suballoc_group(
2047 le64_to_cpu(di->i_blkno),
2048 le16_to_cpu(di->i_suballoc_bit));
2049 }
2050}
2051
2052static inline void ocfs2_save_inode_ac_group(struct inode *dir,
2053 struct ocfs2_alloc_context *ac)
2054{
2055 OCFS2_I(dir)->ip_last_used_group = ac->ac_last_group;
2056 OCFS2_I(dir)->ip_last_used_slot = ac->ac_alloc_slot;
2057}
2058
2059int ocfs2_find_new_inode_loc(struct inode *dir,
2060 struct buffer_head *parent_fe_bh,
2061 struct ocfs2_alloc_context *ac,
2062 u64 *fe_blkno)
2063{
2064 int ret;
2065 handle_t *handle = NULL;
2066 struct ocfs2_suballoc_result *res;
2067
2068 BUG_ON(!ac);
2069 BUG_ON(ac->ac_bits_given != 0);
2070 BUG_ON(ac->ac_bits_wanted != 1);
2071 BUG_ON(ac->ac_which != OCFS2_AC_USE_INODE);
2072
2073 res = kzalloc(sizeof(*res), GFP_NOFS);
2074 if (res == NULL) {
2075 ret = -ENOMEM;
2076 mlog_errno(ret);
2077 goto out;
2078 }
2079
2080 ocfs2_init_inode_ac_group(dir, parent_fe_bh, ac);
2081
2082 /*
2083 * The handle started here is for chain relink. Alternatively,
2084 * we could just disable relink for these calls.
2085 */
2086 handle = ocfs2_start_trans(OCFS2_SB(dir->i_sb), OCFS2_SUBALLOC_ALLOC);
2087 if (IS_ERR(handle)) {
2088 ret = PTR_ERR(handle);
2089 handle = NULL;
2090 mlog_errno(ret);
2091 goto out;
2092 }
2093
2094 /*
2095 * This will instruct ocfs2_claim_suballoc_bits and
2096 * ocfs2_search_one_group to search but save actual allocation
2097 * for later.
2098 */
2099 ac->ac_find_loc_only = 1;
2100
2101 ret = ocfs2_claim_suballoc_bits(ac, handle, 1, 1, res);
2102 if (ret < 0) {
2103 mlog_errno(ret);
2104 goto out;
2105 }
2106
2107 ac->ac_find_loc_priv = res;
2108 *fe_blkno = res->sr_blkno;
2109 ocfs2_update_inode_fsync_trans(handle, dir, 0);
2110out:
2111 if (handle)
2112 ocfs2_commit_trans(OCFS2_SB(dir->i_sb), handle);
2113
2114 if (ret)
2115 kfree(res);
2116
2117 return ret;
2118}
2119
2120int ocfs2_claim_new_inode_at_loc(handle_t *handle,
2121 struct inode *dir,
2122 struct ocfs2_alloc_context *ac,
2123 u64 *suballoc_loc,
2124 u16 *suballoc_bit,
2125 u64 di_blkno)
2126{
2127 int ret;
2128 u16 chain;
2129 struct ocfs2_suballoc_result *res = ac->ac_find_loc_priv;
2130 struct buffer_head *bg_bh = NULL;
2131 struct ocfs2_group_desc *bg;
2132 struct ocfs2_dinode *di = (struct ocfs2_dinode *) ac->ac_bh->b_data;
2133
2134 /*
2135 * Since di_blkno is being passed back in, we check for any
2136 * inconsistencies which may have happened between
2137 * calls. These are code bugs as di_blkno is not expected to
2138 * change once returned from ocfs2_find_new_inode_loc()
2139 */
2140 BUG_ON(res->sr_blkno != di_blkno);
2141
2142 ret = ocfs2_read_group_descriptor(ac->ac_inode, di,
2143 res->sr_bg_stable_blkno, &bg_bh);
2144 if (ret) {
2145 mlog_errno(ret);
2146 goto out;
2147 }
2148
2149 bg = (struct ocfs2_group_desc *) bg_bh->b_data;
2150 chain = le16_to_cpu(bg->bg_chain);
2151
2152 ret = ocfs2_alloc_dinode_update_counts(ac->ac_inode, handle,
2153 ac->ac_bh, res->sr_bits,
2154 chain);
2155 if (ret) {
2156 mlog_errno(ret);
2157 goto out;
2158 }
2159
2160 ret = ocfs2_block_group_set_bits(handle,
2161 ac->ac_inode,
2162 bg,
2163 bg_bh,
2164 res->sr_bit_offset,
2165 res->sr_bits);
2166 if (ret < 0) {
2167 ocfs2_rollback_alloc_dinode_counts(ac->ac_inode,
2168 ac->ac_bh, res->sr_bits, chain);
2169 mlog_errno(ret);
2170 goto out;
2171 }
2172
2173 trace_ocfs2_claim_new_inode_at_loc((unsigned long long)di_blkno,
2174 res->sr_bits);
2175
2176 atomic_inc(&OCFS2_SB(ac->ac_inode->i_sb)->alloc_stats.bg_allocs);
2177
2178 BUG_ON(res->sr_bits != 1);
2179
2180 *suballoc_loc = res->sr_bg_blkno;
2181 *suballoc_bit = res->sr_bit_offset;
2182 ac->ac_bits_given++;
2183 ocfs2_save_inode_ac_group(dir, ac);
2184
2185out:
2186 brelse(bg_bh);
2187
2188 return ret;
2189}
2190
2191int ocfs2_claim_new_inode(handle_t *handle,
2192 struct inode *dir,
2193 struct buffer_head *parent_fe_bh,
2194 struct ocfs2_alloc_context *ac,
2195 u64 *suballoc_loc,
2196 u16 *suballoc_bit,
2197 u64 *fe_blkno)
2198{
2199 int status;
2200 struct ocfs2_suballoc_result res;
2201
2202 BUG_ON(!ac);
2203 BUG_ON(ac->ac_bits_given != 0);
2204 BUG_ON(ac->ac_bits_wanted != 1);
2205 BUG_ON(ac->ac_which != OCFS2_AC_USE_INODE);
2206
2207 ocfs2_init_inode_ac_group(dir, parent_fe_bh, ac);
2208
2209 status = ocfs2_claim_suballoc_bits(ac,
2210 handle,
2211 1,
2212 1,
2213 &res);
2214 if (status < 0) {
2215 mlog_errno(status);
2216 goto bail;
2217 }
2218 atomic_inc(&OCFS2_SB(ac->ac_inode->i_sb)->alloc_stats.bg_allocs);
2219
2220 BUG_ON(res.sr_bits != 1);
2221
2222 *suballoc_loc = res.sr_bg_blkno;
2223 *suballoc_bit = res.sr_bit_offset;
2224 *fe_blkno = res.sr_blkno;
2225 ac->ac_bits_given++;
2226 ocfs2_save_inode_ac_group(dir, ac);
2227 status = 0;
2228bail:
2229 if (status)
2230 mlog_errno(status);
2231 return status;
2232}
2233
2234/* translate a group desc. blkno and it's bitmap offset into
2235 * disk cluster offset. */
2236static inline u32 ocfs2_desc_bitmap_to_cluster_off(struct inode *inode,
2237 u64 bg_blkno,
2238 u16 bg_bit_off)
2239{
2240 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2241 u32 cluster = 0;
2242
2243 BUG_ON(!ocfs2_is_cluster_bitmap(inode));
2244
2245 if (bg_blkno != osb->first_cluster_group_blkno)
2246 cluster = ocfs2_blocks_to_clusters(inode->i_sb, bg_blkno);
2247 cluster += (u32) bg_bit_off;
2248 return cluster;
2249}
2250
2251/* given a cluster offset, calculate which block group it belongs to
2252 * and return that block offset. */
2253u64 ocfs2_which_cluster_group(struct inode *inode, u32 cluster)
2254{
2255 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2256 u32 group_no;
2257
2258 BUG_ON(!ocfs2_is_cluster_bitmap(inode));
2259
2260 group_no = cluster / osb->bitmap_cpg;
2261 if (!group_no)
2262 return osb->first_cluster_group_blkno;
2263 return ocfs2_clusters_to_blocks(inode->i_sb,
2264 group_no * osb->bitmap_cpg);
2265}
2266
2267/* given the block number of a cluster start, calculate which cluster
2268 * group and descriptor bitmap offset that corresponds to. */
2269static inline void ocfs2_block_to_cluster_group(struct inode *inode,
2270 u64 data_blkno,
2271 u64 *bg_blkno,
2272 u16 *bg_bit_off)
2273{
2274 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2275 u32 data_cluster = ocfs2_blocks_to_clusters(osb->sb, data_blkno);
2276
2277 BUG_ON(!ocfs2_is_cluster_bitmap(inode));
2278
2279 *bg_blkno = ocfs2_which_cluster_group(inode,
2280 data_cluster);
2281
2282 if (*bg_blkno == osb->first_cluster_group_blkno)
2283 *bg_bit_off = (u16) data_cluster;
2284 else
2285 *bg_bit_off = (u16) ocfs2_blocks_to_clusters(osb->sb,
2286 data_blkno - *bg_blkno);
2287}
2288
2289/*
2290 * min_bits - minimum contiguous chunk from this total allocation we
2291 * can handle. set to what we asked for originally for a full
2292 * contig. allocation, set to '1' to indicate we can deal with extents
2293 * of any size.
2294 */
2295int __ocfs2_claim_clusters(handle_t *handle,
2296 struct ocfs2_alloc_context *ac,
2297 u32 min_clusters,
2298 u32 max_clusters,
2299 u32 *cluster_start,
2300 u32 *num_clusters)
2301{
2302 int status;
2303 unsigned int bits_wanted = max_clusters;
2304 struct ocfs2_suballoc_result res = { .sr_blkno = 0, };
2305 struct ocfs2_super *osb = OCFS2_SB(ac->ac_inode->i_sb);
2306
2307 BUG_ON(ac->ac_bits_given >= ac->ac_bits_wanted);
2308
2309 BUG_ON(ac->ac_which != OCFS2_AC_USE_LOCAL
2310 && ac->ac_which != OCFS2_AC_USE_MAIN);
2311
2312 if (ac->ac_which == OCFS2_AC_USE_LOCAL) {
2313 WARN_ON(min_clusters > 1);
2314
2315 status = ocfs2_claim_local_alloc_bits(osb,
2316 handle,
2317 ac,
2318 bits_wanted,
2319 cluster_start,
2320 num_clusters);
2321 if (!status)
2322 atomic_inc(&osb->alloc_stats.local_data);
2323 } else {
2324 if (min_clusters > (osb->bitmap_cpg - 1)) {
2325 /* The only paths asking for contiguousness
2326 * should know about this already. */
2327 mlog(ML_ERROR, "minimum allocation requested %u exceeds "
2328 "group bitmap size %u!\n", min_clusters,
2329 osb->bitmap_cpg);
2330 status = -ENOSPC;
2331 goto bail;
2332 }
2333 /* clamp the current request down to a realistic size. */
2334 if (bits_wanted > (osb->bitmap_cpg - 1))
2335 bits_wanted = osb->bitmap_cpg - 1;
2336
2337 status = ocfs2_claim_suballoc_bits(ac,
2338 handle,
2339 bits_wanted,
2340 min_clusters,
2341 &res);
2342 if (!status) {
2343 BUG_ON(res.sr_blkno); /* cluster alloc can't set */
2344 *cluster_start =
2345 ocfs2_desc_bitmap_to_cluster_off(ac->ac_inode,
2346 res.sr_bg_blkno,
2347 res.sr_bit_offset);
2348 atomic_inc(&osb->alloc_stats.bitmap_data);
2349 *num_clusters = res.sr_bits;
2350 }
2351 }
2352 if (status < 0) {
2353 if (status != -ENOSPC)
2354 mlog_errno(status);
2355 goto bail;
2356 }
2357
2358 ac->ac_bits_given += *num_clusters;
2359
2360bail:
2361 if (status)
2362 mlog_errno(status);
2363 return status;
2364}
2365
2366int ocfs2_claim_clusters(handle_t *handle,
2367 struct ocfs2_alloc_context *ac,
2368 u32 min_clusters,
2369 u32 *cluster_start,
2370 u32 *num_clusters)
2371{
2372 unsigned int bits_wanted = ac->ac_bits_wanted - ac->ac_bits_given;
2373
2374 return __ocfs2_claim_clusters(handle, ac, min_clusters,
2375 bits_wanted, cluster_start, num_clusters);
2376}
2377
2378static int ocfs2_block_group_clear_bits(handle_t *handle,
2379 struct inode *alloc_inode,
2380 struct ocfs2_group_desc *bg,
2381 struct buffer_head *group_bh,
2382 unsigned int bit_off,
2383 unsigned int num_bits,
2384 void (*undo_fn)(unsigned int bit,
2385 unsigned long *bmap))
2386{
2387 int status;
2388 unsigned int tmp;
2389 struct ocfs2_group_desc *undo_bg = NULL;
2390
2391 /* The caller got this descriptor from
2392 * ocfs2_read_group_descriptor(). Any corruption is a code bug. */
2393 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
2394
2395 trace_ocfs2_block_group_clear_bits(bit_off, num_bits);
2396
2397 BUG_ON(undo_fn && !ocfs2_is_cluster_bitmap(alloc_inode));
2398 status = ocfs2_journal_access_gd(handle, INODE_CACHE(alloc_inode),
2399 group_bh,
2400 undo_fn ?
2401 OCFS2_JOURNAL_ACCESS_UNDO :
2402 OCFS2_JOURNAL_ACCESS_WRITE);
2403 if (status < 0) {
2404 mlog_errno(status);
2405 goto bail;
2406 }
2407
2408 if (undo_fn) {
2409 jbd_lock_bh_state(group_bh);
2410 undo_bg = (struct ocfs2_group_desc *)
2411 bh2jh(group_bh)->b_committed_data;
2412 BUG_ON(!undo_bg);
2413 }
2414
2415 tmp = num_bits;
2416 while(tmp--) {
2417 ocfs2_clear_bit((bit_off + tmp),
2418 (unsigned long *) bg->bg_bitmap);
2419 if (undo_fn)
2420 undo_fn(bit_off + tmp,
2421 (unsigned long *) undo_bg->bg_bitmap);
2422 }
2423 le16_add_cpu(&bg->bg_free_bits_count, num_bits);
2424 if (le16_to_cpu(bg->bg_free_bits_count) > le16_to_cpu(bg->bg_bits)) {
2425 if (undo_fn)
2426 jbd_unlock_bh_state(group_bh);
2427 return ocfs2_error(alloc_inode->i_sb, "Group descriptor # %llu has bit count %u but claims %u are freed. num_bits %d\n",
2428 (unsigned long long)le64_to_cpu(bg->bg_blkno),
2429 le16_to_cpu(bg->bg_bits),
2430 le16_to_cpu(bg->bg_free_bits_count),
2431 num_bits);
2432 }
2433
2434 if (undo_fn)
2435 jbd_unlock_bh_state(group_bh);
2436
2437 ocfs2_journal_dirty(handle, group_bh);
2438bail:
2439 return status;
2440}
2441
2442/*
2443 * expects the suballoc inode to already be locked.
2444 */
2445static int _ocfs2_free_suballoc_bits(handle_t *handle,
2446 struct inode *alloc_inode,
2447 struct buffer_head *alloc_bh,
2448 unsigned int start_bit,
2449 u64 bg_blkno,
2450 unsigned int count,
2451 void (*undo_fn)(unsigned int bit,
2452 unsigned long *bitmap))
2453{
2454 int status = 0;
2455 u32 tmp_used;
2456 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) alloc_bh->b_data;
2457 struct ocfs2_chain_list *cl = &fe->id2.i_chain;
2458 struct buffer_head *group_bh = NULL;
2459 struct ocfs2_group_desc *group;
2460
2461 /* The alloc_bh comes from ocfs2_free_dinode() or
2462 * ocfs2_free_clusters(). The callers have all locked the
2463 * allocator and gotten alloc_bh from the lock call. This
2464 * validates the dinode buffer. Any corruption that has happened
2465 * is a code bug. */
2466 BUG_ON(!OCFS2_IS_VALID_DINODE(fe));
2467 BUG_ON((count + start_bit) > ocfs2_bits_per_group(cl));
2468
2469 trace_ocfs2_free_suballoc_bits(
2470 (unsigned long long)OCFS2_I(alloc_inode)->ip_blkno,
2471 (unsigned long long)bg_blkno,
2472 start_bit, count);
2473
2474 status = ocfs2_read_group_descriptor(alloc_inode, fe, bg_blkno,
2475 &group_bh);
2476 if (status < 0) {
2477 mlog_errno(status);
2478 goto bail;
2479 }
2480 group = (struct ocfs2_group_desc *) group_bh->b_data;
2481
2482 BUG_ON((count + start_bit) > le16_to_cpu(group->bg_bits));
2483
2484 status = ocfs2_block_group_clear_bits(handle, alloc_inode,
2485 group, group_bh,
2486 start_bit, count, undo_fn);
2487 if (status < 0) {
2488 mlog_errno(status);
2489 goto bail;
2490 }
2491
2492 status = ocfs2_journal_access_di(handle, INODE_CACHE(alloc_inode),
2493 alloc_bh, OCFS2_JOURNAL_ACCESS_WRITE);
2494 if (status < 0) {
2495 mlog_errno(status);
2496 ocfs2_block_group_set_bits(handle, alloc_inode, group, group_bh,
2497 start_bit, count);
2498 goto bail;
2499 }
2500
2501 le32_add_cpu(&cl->cl_recs[le16_to_cpu(group->bg_chain)].c_free,
2502 count);
2503 tmp_used = le32_to_cpu(fe->id1.bitmap1.i_used);
2504 fe->id1.bitmap1.i_used = cpu_to_le32(tmp_used - count);
2505 ocfs2_journal_dirty(handle, alloc_bh);
2506
2507bail:
2508 brelse(group_bh);
2509
2510 if (status)
2511 mlog_errno(status);
2512 return status;
2513}
2514
2515int ocfs2_free_suballoc_bits(handle_t *handle,
2516 struct inode *alloc_inode,
2517 struct buffer_head *alloc_bh,
2518 unsigned int start_bit,
2519 u64 bg_blkno,
2520 unsigned int count)
2521{
2522 return _ocfs2_free_suballoc_bits(handle, alloc_inode, alloc_bh,
2523 start_bit, bg_blkno, count, NULL);
2524}
2525
2526int ocfs2_free_dinode(handle_t *handle,
2527 struct inode *inode_alloc_inode,
2528 struct buffer_head *inode_alloc_bh,
2529 struct ocfs2_dinode *di)
2530{
2531 u64 blk = le64_to_cpu(di->i_blkno);
2532 u16 bit = le16_to_cpu(di->i_suballoc_bit);
2533 u64 bg_blkno = ocfs2_which_suballoc_group(blk, bit);
2534
2535 if (di->i_suballoc_loc)
2536 bg_blkno = le64_to_cpu(di->i_suballoc_loc);
2537 return ocfs2_free_suballoc_bits(handle, inode_alloc_inode,
2538 inode_alloc_bh, bit, bg_blkno, 1);
2539}
2540
2541static int _ocfs2_free_clusters(handle_t *handle,
2542 struct inode *bitmap_inode,
2543 struct buffer_head *bitmap_bh,
2544 u64 start_blk,
2545 unsigned int num_clusters,
2546 void (*undo_fn)(unsigned int bit,
2547 unsigned long *bitmap))
2548{
2549 int status;
2550 u16 bg_start_bit;
2551 u64 bg_blkno;
2552
2553 /* You can't ever have a contiguous set of clusters
2554 * bigger than a block group bitmap so we never have to worry
2555 * about looping on them.
2556 * This is expensive. We can safely remove once this stuff has
2557 * gotten tested really well. */
2558 BUG_ON(start_blk != ocfs2_clusters_to_blocks(bitmap_inode->i_sb,
2559 ocfs2_blocks_to_clusters(bitmap_inode->i_sb,
2560 start_blk)));
2561
2562
2563 ocfs2_block_to_cluster_group(bitmap_inode, start_blk, &bg_blkno,
2564 &bg_start_bit);
2565
2566 trace_ocfs2_free_clusters((unsigned long long)bg_blkno,
2567 (unsigned long long)start_blk,
2568 bg_start_bit, num_clusters);
2569
2570 status = _ocfs2_free_suballoc_bits(handle, bitmap_inode, bitmap_bh,
2571 bg_start_bit, bg_blkno,
2572 num_clusters, undo_fn);
2573 if (status < 0) {
2574 mlog_errno(status);
2575 goto out;
2576 }
2577
2578 ocfs2_local_alloc_seen_free_bits(OCFS2_SB(bitmap_inode->i_sb),
2579 num_clusters);
2580
2581out:
2582 if (status)
2583 mlog_errno(status);
2584 return status;
2585}
2586
2587int ocfs2_free_clusters(handle_t *handle,
2588 struct inode *bitmap_inode,
2589 struct buffer_head *bitmap_bh,
2590 u64 start_blk,
2591 unsigned int num_clusters)
2592{
2593 return _ocfs2_free_clusters(handle, bitmap_inode, bitmap_bh,
2594 start_blk, num_clusters,
2595 _ocfs2_set_bit);
2596}
2597
2598/*
2599 * Give never-used clusters back to the global bitmap. We don't need
2600 * to protect these bits in the undo buffer.
2601 */
2602int ocfs2_release_clusters(handle_t *handle,
2603 struct inode *bitmap_inode,
2604 struct buffer_head *bitmap_bh,
2605 u64 start_blk,
2606 unsigned int num_clusters)
2607{
2608 return _ocfs2_free_clusters(handle, bitmap_inode, bitmap_bh,
2609 start_blk, num_clusters,
2610 _ocfs2_clear_bit);
2611}
2612
2613/*
2614 * For a given allocation, determine which allocators will need to be
2615 * accessed, and lock them, reserving the appropriate number of bits.
2616 *
2617 * Sparse file systems call this from ocfs2_write_begin_nolock()
2618 * and ocfs2_allocate_unwritten_extents().
2619 *
2620 * File systems which don't support holes call this from
2621 * ocfs2_extend_allocation().
2622 */
2623int ocfs2_lock_allocators(struct inode *inode,
2624 struct ocfs2_extent_tree *et,
2625 u32 clusters_to_add, u32 extents_to_split,
2626 struct ocfs2_alloc_context **data_ac,
2627 struct ocfs2_alloc_context **meta_ac)
2628{
2629 int ret = 0, num_free_extents;
2630 unsigned int max_recs_needed = clusters_to_add + 2 * extents_to_split;
2631 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2632
2633 *meta_ac = NULL;
2634 if (data_ac)
2635 *data_ac = NULL;
2636
2637 BUG_ON(clusters_to_add != 0 && data_ac == NULL);
2638
2639 num_free_extents = ocfs2_num_free_extents(et);
2640 if (num_free_extents < 0) {
2641 ret = num_free_extents;
2642 mlog_errno(ret);
2643 goto out;
2644 }
2645
2646 /*
2647 * Sparse allocation file systems need to be more conservative
2648 * with reserving room for expansion - the actual allocation
2649 * happens while we've got a journal handle open so re-taking
2650 * a cluster lock (because we ran out of room for another
2651 * extent) will violate ordering rules.
2652 *
2653 * Most of the time we'll only be seeing this 1 cluster at a time
2654 * anyway.
2655 *
2656 * Always lock for any unwritten extents - we might want to
2657 * add blocks during a split.
2658 */
2659 if (!num_free_extents ||
2660 (ocfs2_sparse_alloc(osb) && num_free_extents < max_recs_needed)) {
2661 ret = ocfs2_reserve_new_metadata(osb, et->et_root_el, meta_ac);
2662 if (ret < 0) {
2663 if (ret != -ENOSPC)
2664 mlog_errno(ret);
2665 goto out;
2666 }
2667 }
2668
2669 if (clusters_to_add == 0)
2670 goto out;
2671
2672 ret = ocfs2_reserve_clusters(osb, clusters_to_add, data_ac);
2673 if (ret < 0) {
2674 if (ret != -ENOSPC)
2675 mlog_errno(ret);
2676 goto out;
2677 }
2678
2679out:
2680 if (ret) {
2681 if (*meta_ac) {
2682 ocfs2_free_alloc_context(*meta_ac);
2683 *meta_ac = NULL;
2684 }
2685
2686 /*
2687 * We cannot have an error and a non null *data_ac.
2688 */
2689 }
2690
2691 return ret;
2692}
2693
2694/*
2695 * Read the inode specified by blkno to get suballoc_slot and
2696 * suballoc_bit.
2697 */
2698static int ocfs2_get_suballoc_slot_bit(struct ocfs2_super *osb, u64 blkno,
2699 u16 *suballoc_slot, u64 *group_blkno,
2700 u16 *suballoc_bit)
2701{
2702 int status;
2703 struct buffer_head *inode_bh = NULL;
2704 struct ocfs2_dinode *inode_fe;
2705
2706 trace_ocfs2_get_suballoc_slot_bit((unsigned long long)blkno);
2707
2708 /* dirty read disk */
2709 status = ocfs2_read_blocks_sync(osb, blkno, 1, &inode_bh);
2710 if (status < 0) {
2711 mlog(ML_ERROR, "read block %llu failed %d\n",
2712 (unsigned long long)blkno, status);
2713 goto bail;
2714 }
2715
2716 inode_fe = (struct ocfs2_dinode *) inode_bh->b_data;
2717 if (!OCFS2_IS_VALID_DINODE(inode_fe)) {
2718 mlog(ML_ERROR, "invalid inode %llu requested\n",
2719 (unsigned long long)blkno);
2720 status = -EINVAL;
2721 goto bail;
2722 }
2723
2724 if (le16_to_cpu(inode_fe->i_suballoc_slot) != (u16)OCFS2_INVALID_SLOT &&
2725 (u32)le16_to_cpu(inode_fe->i_suballoc_slot) > osb->max_slots - 1) {
2726 mlog(ML_ERROR, "inode %llu has invalid suballoc slot %u\n",
2727 (unsigned long long)blkno,
2728 (u32)le16_to_cpu(inode_fe->i_suballoc_slot));
2729 status = -EINVAL;
2730 goto bail;
2731 }
2732
2733 if (suballoc_slot)
2734 *suballoc_slot = le16_to_cpu(inode_fe->i_suballoc_slot);
2735 if (suballoc_bit)
2736 *suballoc_bit = le16_to_cpu(inode_fe->i_suballoc_bit);
2737 if (group_blkno)
2738 *group_blkno = le64_to_cpu(inode_fe->i_suballoc_loc);
2739
2740bail:
2741 brelse(inode_bh);
2742
2743 if (status)
2744 mlog_errno(status);
2745 return status;
2746}
2747
2748/*
2749 * test whether bit is SET in allocator bitmap or not. on success, 0
2750 * is returned and *res is 1 for SET; 0 otherwise. when fails, errno
2751 * is returned and *res is meaningless. Call this after you have
2752 * cluster locked against suballoc, or you may get a result based on
2753 * non-up2date contents
2754 */
2755static int ocfs2_test_suballoc_bit(struct ocfs2_super *osb,
2756 struct inode *suballoc,
2757 struct buffer_head *alloc_bh,
2758 u64 group_blkno, u64 blkno,
2759 u16 bit, int *res)
2760{
2761 struct ocfs2_dinode *alloc_di;
2762 struct ocfs2_group_desc *group;
2763 struct buffer_head *group_bh = NULL;
2764 u64 bg_blkno;
2765 int status;
2766
2767 trace_ocfs2_test_suballoc_bit((unsigned long long)blkno,
2768 (unsigned int)bit);
2769
2770 alloc_di = (struct ocfs2_dinode *)alloc_bh->b_data;
2771 if ((bit + 1) > ocfs2_bits_per_group(&alloc_di->id2.i_chain)) {
2772 mlog(ML_ERROR, "suballoc bit %u out of range of %u\n",
2773 (unsigned int)bit,
2774 ocfs2_bits_per_group(&alloc_di->id2.i_chain));
2775 status = -EINVAL;
2776 goto bail;
2777 }
2778
2779 bg_blkno = group_blkno ? group_blkno :
2780 ocfs2_which_suballoc_group(blkno, bit);
2781 status = ocfs2_read_group_descriptor(suballoc, alloc_di, bg_blkno,
2782 &group_bh);
2783 if (status < 0) {
2784 mlog(ML_ERROR, "read group %llu failed %d\n",
2785 (unsigned long long)bg_blkno, status);
2786 goto bail;
2787 }
2788
2789 group = (struct ocfs2_group_desc *) group_bh->b_data;
2790 *res = ocfs2_test_bit(bit, (unsigned long *)group->bg_bitmap);
2791
2792bail:
2793 brelse(group_bh);
2794
2795 if (status)
2796 mlog_errno(status);
2797 return status;
2798}
2799
2800/*
2801 * Test if the bit representing this inode (blkno) is set in the
2802 * suballocator.
2803 *
2804 * On success, 0 is returned and *res is 1 for SET; 0 otherwise.
2805 *
2806 * In the event of failure, a negative value is returned and *res is
2807 * meaningless.
2808 *
2809 * Callers must make sure to hold nfs_sync_lock to prevent
2810 * ocfs2_delete_inode() on another node from accessing the same
2811 * suballocator concurrently.
2812 */
2813int ocfs2_test_inode_bit(struct ocfs2_super *osb, u64 blkno, int *res)
2814{
2815 int status;
2816 u64 group_blkno = 0;
2817 u16 suballoc_bit = 0, suballoc_slot = 0;
2818 struct inode *inode_alloc_inode;
2819 struct buffer_head *alloc_bh = NULL;
2820
2821 trace_ocfs2_test_inode_bit((unsigned long long)blkno);
2822
2823 status = ocfs2_get_suballoc_slot_bit(osb, blkno, &suballoc_slot,
2824 &group_blkno, &suballoc_bit);
2825 if (status < 0) {
2826 mlog(ML_ERROR, "get alloc slot and bit failed %d\n", status);
2827 goto bail;
2828 }
2829
2830 inode_alloc_inode =
2831 ocfs2_get_system_file_inode(osb, INODE_ALLOC_SYSTEM_INODE,
2832 suballoc_slot);
2833 if (!inode_alloc_inode) {
2834 /* the error code could be inaccurate, but we are not able to
2835 * get the correct one. */
2836 status = -EINVAL;
2837 mlog(ML_ERROR, "unable to get alloc inode in slot %u\n",
2838 (u32)suballoc_slot);
2839 goto bail;
2840 }
2841
2842 inode_lock(inode_alloc_inode);
2843 status = ocfs2_inode_lock(inode_alloc_inode, &alloc_bh, 0);
2844 if (status < 0) {
2845 inode_unlock(inode_alloc_inode);
2846 iput(inode_alloc_inode);
2847 mlog(ML_ERROR, "lock on alloc inode on slot %u failed %d\n",
2848 (u32)suballoc_slot, status);
2849 goto bail;
2850 }
2851
2852 status = ocfs2_test_suballoc_bit(osb, inode_alloc_inode, alloc_bh,
2853 group_blkno, blkno, suballoc_bit, res);
2854 if (status < 0)
2855 mlog(ML_ERROR, "test suballoc bit failed %d\n", status);
2856
2857 ocfs2_inode_unlock(inode_alloc_inode, 0);
2858 inode_unlock(inode_alloc_inode);
2859
2860 iput(inode_alloc_inode);
2861 brelse(alloc_bh);
2862bail:
2863 if (status)
2864 mlog_errno(status);
2865 return status;
2866}
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * suballoc.c
4 *
5 * metadata alloc and free
6 * Inspired by ext3 block groups.
7 *
8 * Copyright (C) 2002, 2004 Oracle. All rights reserved.
9 */
10
11#include <linux/fs.h>
12#include <linux/types.h>
13#include <linux/slab.h>
14#include <linux/highmem.h>
15
16#include <cluster/masklog.h>
17
18#include "ocfs2.h"
19
20#include "alloc.h"
21#include "blockcheck.h"
22#include "dlmglue.h"
23#include "inode.h"
24#include "journal.h"
25#include "localalloc.h"
26#include "suballoc.h"
27#include "super.h"
28#include "sysfile.h"
29#include "uptodate.h"
30#include "ocfs2_trace.h"
31
32#include "buffer_head_io.h"
33
34#define NOT_ALLOC_NEW_GROUP 0
35#define ALLOC_NEW_GROUP 0x1
36#define ALLOC_GROUPS_FROM_GLOBAL 0x2
37
38#define OCFS2_MAX_TO_STEAL 1024
39
40struct ocfs2_suballoc_result {
41 u64 sr_bg_blkno; /* The bg we allocated from. Set
42 to 0 when a block group is
43 contiguous. */
44 u64 sr_bg_stable_blkno; /*
45 * Doesn't change, always
46 * set to target block
47 * group descriptor
48 * block.
49 */
50 u64 sr_blkno; /* The first allocated block */
51 unsigned int sr_bit_offset; /* The bit in the bg */
52 unsigned int sr_bits; /* How many bits we claimed */
53};
54
55static u64 ocfs2_group_from_res(struct ocfs2_suballoc_result *res)
56{
57 if (res->sr_blkno == 0)
58 return 0;
59
60 if (res->sr_bg_blkno)
61 return res->sr_bg_blkno;
62
63 return ocfs2_which_suballoc_group(res->sr_blkno, res->sr_bit_offset);
64}
65
66static inline u16 ocfs2_find_victim_chain(struct ocfs2_chain_list *cl);
67static int ocfs2_block_group_fill(handle_t *handle,
68 struct inode *alloc_inode,
69 struct buffer_head *bg_bh,
70 u64 group_blkno,
71 unsigned int group_clusters,
72 u16 my_chain,
73 struct ocfs2_chain_list *cl);
74static int ocfs2_block_group_alloc(struct ocfs2_super *osb,
75 struct inode *alloc_inode,
76 struct buffer_head *bh,
77 u64 max_block,
78 u64 *last_alloc_group,
79 int flags);
80
81static int ocfs2_cluster_group_search(struct inode *inode,
82 struct buffer_head *group_bh,
83 u32 bits_wanted, u32 min_bits,
84 u64 max_block,
85 struct ocfs2_suballoc_result *res);
86static int ocfs2_block_group_search(struct inode *inode,
87 struct buffer_head *group_bh,
88 u32 bits_wanted, u32 min_bits,
89 u64 max_block,
90 struct ocfs2_suballoc_result *res);
91static int ocfs2_claim_suballoc_bits(struct ocfs2_alloc_context *ac,
92 handle_t *handle,
93 u32 bits_wanted,
94 u32 min_bits,
95 struct ocfs2_suballoc_result *res);
96static int ocfs2_test_bg_bit_allocatable(struct buffer_head *bg_bh,
97 int nr);
98static int ocfs2_relink_block_group(handle_t *handle,
99 struct inode *alloc_inode,
100 struct buffer_head *fe_bh,
101 struct buffer_head *bg_bh,
102 struct buffer_head *prev_bg_bh,
103 u16 chain);
104static inline int ocfs2_block_group_reasonably_empty(struct ocfs2_group_desc *bg,
105 u32 wanted);
106static inline u32 ocfs2_desc_bitmap_to_cluster_off(struct inode *inode,
107 u64 bg_blkno,
108 u16 bg_bit_off);
109static inline void ocfs2_block_to_cluster_group(struct inode *inode,
110 u64 data_blkno,
111 u64 *bg_blkno,
112 u16 *bg_bit_off);
113static int ocfs2_reserve_clusters_with_limit(struct ocfs2_super *osb,
114 u32 bits_wanted, u64 max_block,
115 int flags,
116 struct ocfs2_alloc_context **ac);
117
118void ocfs2_free_ac_resource(struct ocfs2_alloc_context *ac)
119{
120 struct inode *inode = ac->ac_inode;
121
122 if (inode) {
123 if (ac->ac_which != OCFS2_AC_USE_LOCAL)
124 ocfs2_inode_unlock(inode, 1);
125
126 inode_unlock(inode);
127
128 iput(inode);
129 ac->ac_inode = NULL;
130 }
131 brelse(ac->ac_bh);
132 ac->ac_bh = NULL;
133 ac->ac_resv = NULL;
134 kfree(ac->ac_find_loc_priv);
135 ac->ac_find_loc_priv = NULL;
136}
137
138void ocfs2_free_alloc_context(struct ocfs2_alloc_context *ac)
139{
140 ocfs2_free_ac_resource(ac);
141 kfree(ac);
142}
143
144static u32 ocfs2_bits_per_group(struct ocfs2_chain_list *cl)
145{
146 return (u32)le16_to_cpu(cl->cl_cpg) * (u32)le16_to_cpu(cl->cl_bpc);
147}
148
149#define do_error(fmt, ...) \
150do { \
151 if (resize) \
152 mlog(ML_ERROR, fmt, ##__VA_ARGS__); \
153 else \
154 return ocfs2_error(sb, fmt, ##__VA_ARGS__); \
155} while (0)
156
157static int ocfs2_validate_gd_self(struct super_block *sb,
158 struct buffer_head *bh,
159 int resize)
160{
161 struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data;
162
163 if (!OCFS2_IS_VALID_GROUP_DESC(gd)) {
164 do_error("Group descriptor #%llu has bad signature %.*s\n",
165 (unsigned long long)bh->b_blocknr, 7,
166 gd->bg_signature);
167 }
168
169 if (le64_to_cpu(gd->bg_blkno) != bh->b_blocknr) {
170 do_error("Group descriptor #%llu has an invalid bg_blkno of %llu\n",
171 (unsigned long long)bh->b_blocknr,
172 (unsigned long long)le64_to_cpu(gd->bg_blkno));
173 }
174
175 if (le32_to_cpu(gd->bg_generation) != OCFS2_SB(sb)->fs_generation) {
176 do_error("Group descriptor #%llu has an invalid fs_generation of #%u\n",
177 (unsigned long long)bh->b_blocknr,
178 le32_to_cpu(gd->bg_generation));
179 }
180
181 if (le16_to_cpu(gd->bg_free_bits_count) > le16_to_cpu(gd->bg_bits)) {
182 do_error("Group descriptor #%llu has bit count %u but claims that %u are free\n",
183 (unsigned long long)bh->b_blocknr,
184 le16_to_cpu(gd->bg_bits),
185 le16_to_cpu(gd->bg_free_bits_count));
186 }
187
188 if (le16_to_cpu(gd->bg_bits) > (8 * le16_to_cpu(gd->bg_size))) {
189 do_error("Group descriptor #%llu has bit count %u but max bitmap bits of %u\n",
190 (unsigned long long)bh->b_blocknr,
191 le16_to_cpu(gd->bg_bits),
192 8 * le16_to_cpu(gd->bg_size));
193 }
194
195 return 0;
196}
197
198static int ocfs2_validate_gd_parent(struct super_block *sb,
199 struct ocfs2_dinode *di,
200 struct buffer_head *bh,
201 int resize)
202{
203 unsigned int max_bits;
204 struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data;
205
206 if (di->i_blkno != gd->bg_parent_dinode) {
207 do_error("Group descriptor #%llu has bad parent pointer (%llu, expected %llu)\n",
208 (unsigned long long)bh->b_blocknr,
209 (unsigned long long)le64_to_cpu(gd->bg_parent_dinode),
210 (unsigned long long)le64_to_cpu(di->i_blkno));
211 }
212
213 max_bits = le16_to_cpu(di->id2.i_chain.cl_cpg) * le16_to_cpu(di->id2.i_chain.cl_bpc);
214 if (le16_to_cpu(gd->bg_bits) > max_bits) {
215 do_error("Group descriptor #%llu has bit count of %u\n",
216 (unsigned long long)bh->b_blocknr,
217 le16_to_cpu(gd->bg_bits));
218 }
219
220 /* In resize, we may meet the case bg_chain == cl_next_free_rec. */
221 if ((le16_to_cpu(gd->bg_chain) >
222 le16_to_cpu(di->id2.i_chain.cl_next_free_rec)) ||
223 ((le16_to_cpu(gd->bg_chain) ==
224 le16_to_cpu(di->id2.i_chain.cl_next_free_rec)) && !resize)) {
225 do_error("Group descriptor #%llu has bad chain %u\n",
226 (unsigned long long)bh->b_blocknr,
227 le16_to_cpu(gd->bg_chain));
228 }
229
230 return 0;
231}
232
233#undef do_error
234
235/*
236 * This version only prints errors. It does not fail the filesystem, and
237 * exists only for resize.
238 */
239int ocfs2_check_group_descriptor(struct super_block *sb,
240 struct ocfs2_dinode *di,
241 struct buffer_head *bh)
242{
243 int rc;
244 struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data;
245
246 BUG_ON(!buffer_uptodate(bh));
247
248 /*
249 * If the ecc fails, we return the error but otherwise
250 * leave the filesystem running. We know any error is
251 * local to this block.
252 */
253 rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &gd->bg_check);
254 if (rc) {
255 mlog(ML_ERROR,
256 "Checksum failed for group descriptor %llu\n",
257 (unsigned long long)bh->b_blocknr);
258 } else
259 rc = ocfs2_validate_gd_self(sb, bh, 1);
260 if (!rc)
261 rc = ocfs2_validate_gd_parent(sb, di, bh, 1);
262
263 return rc;
264}
265
266static int ocfs2_validate_group_descriptor(struct super_block *sb,
267 struct buffer_head *bh)
268{
269 int rc;
270 struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data;
271
272 trace_ocfs2_validate_group_descriptor(
273 (unsigned long long)bh->b_blocknr);
274
275 BUG_ON(!buffer_uptodate(bh));
276
277 /*
278 * If the ecc fails, we return the error but otherwise
279 * leave the filesystem running. We know any error is
280 * local to this block.
281 */
282 rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &gd->bg_check);
283 if (rc)
284 return rc;
285
286 /*
287 * Errors after here are fatal.
288 */
289
290 return ocfs2_validate_gd_self(sb, bh, 0);
291}
292
293int ocfs2_read_group_descriptor(struct inode *inode, struct ocfs2_dinode *di,
294 u64 gd_blkno, struct buffer_head **bh)
295{
296 int rc;
297 struct buffer_head *tmp = *bh;
298
299 rc = ocfs2_read_block(INODE_CACHE(inode), gd_blkno, &tmp,
300 ocfs2_validate_group_descriptor);
301 if (rc)
302 goto out;
303
304 rc = ocfs2_validate_gd_parent(inode->i_sb, di, tmp, 0);
305 if (rc) {
306 brelse(tmp);
307 goto out;
308 }
309
310 /* If ocfs2_read_block() got us a new bh, pass it up. */
311 if (!*bh)
312 *bh = tmp;
313
314out:
315 return rc;
316}
317
318static void ocfs2_bg_discontig_add_extent(struct ocfs2_super *osb,
319 struct ocfs2_group_desc *bg,
320 struct ocfs2_chain_list *cl,
321 u64 p_blkno, unsigned int clusters)
322{
323 struct ocfs2_extent_list *el = &bg->bg_list;
324 struct ocfs2_extent_rec *rec;
325
326 BUG_ON(!ocfs2_supports_discontig_bg(osb));
327 if (!el->l_next_free_rec)
328 el->l_count = cpu_to_le16(ocfs2_extent_recs_per_gd(osb->sb));
329 rec = &el->l_recs[le16_to_cpu(el->l_next_free_rec)];
330 rec->e_blkno = cpu_to_le64(p_blkno);
331 rec->e_cpos = cpu_to_le32(le16_to_cpu(bg->bg_bits) /
332 le16_to_cpu(cl->cl_bpc));
333 rec->e_leaf_clusters = cpu_to_le16(clusters);
334 le16_add_cpu(&bg->bg_bits, clusters * le16_to_cpu(cl->cl_bpc));
335 le16_add_cpu(&bg->bg_free_bits_count,
336 clusters * le16_to_cpu(cl->cl_bpc));
337 le16_add_cpu(&el->l_next_free_rec, 1);
338}
339
340static int ocfs2_block_group_fill(handle_t *handle,
341 struct inode *alloc_inode,
342 struct buffer_head *bg_bh,
343 u64 group_blkno,
344 unsigned int group_clusters,
345 u16 my_chain,
346 struct ocfs2_chain_list *cl)
347{
348 int status = 0;
349 struct ocfs2_super *osb = OCFS2_SB(alloc_inode->i_sb);
350 struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data;
351 struct super_block * sb = alloc_inode->i_sb;
352
353 if (((unsigned long long) bg_bh->b_blocknr) != group_blkno) {
354 status = ocfs2_error(alloc_inode->i_sb,
355 "group block (%llu) != b_blocknr (%llu)\n",
356 (unsigned long long)group_blkno,
357 (unsigned long long) bg_bh->b_blocknr);
358 goto bail;
359 }
360
361 status = ocfs2_journal_access_gd(handle,
362 INODE_CACHE(alloc_inode),
363 bg_bh,
364 OCFS2_JOURNAL_ACCESS_CREATE);
365 if (status < 0) {
366 mlog_errno(status);
367 goto bail;
368 }
369
370 memset(bg, 0, sb->s_blocksize);
371 strcpy(bg->bg_signature, OCFS2_GROUP_DESC_SIGNATURE);
372 bg->bg_generation = cpu_to_le32(osb->fs_generation);
373 bg->bg_size = cpu_to_le16(ocfs2_group_bitmap_size(sb, 1,
374 osb->s_feature_incompat));
375 bg->bg_chain = cpu_to_le16(my_chain);
376 bg->bg_next_group = cl->cl_recs[my_chain].c_blkno;
377 bg->bg_parent_dinode = cpu_to_le64(OCFS2_I(alloc_inode)->ip_blkno);
378 bg->bg_blkno = cpu_to_le64(group_blkno);
379 if (group_clusters == le16_to_cpu(cl->cl_cpg))
380 bg->bg_bits = cpu_to_le16(ocfs2_bits_per_group(cl));
381 else
382 ocfs2_bg_discontig_add_extent(osb, bg, cl, group_blkno,
383 group_clusters);
384
385 /* set the 1st bit in the bitmap to account for the descriptor block */
386 ocfs2_set_bit(0, (unsigned long *)bg->bg_bitmap);
387 bg->bg_free_bits_count = cpu_to_le16(le16_to_cpu(bg->bg_bits) - 1);
388
389 ocfs2_journal_dirty(handle, bg_bh);
390
391 /* There is no need to zero out or otherwise initialize the
392 * other blocks in a group - All valid FS metadata in a block
393 * group stores the superblock fs_generation value at
394 * allocation time. */
395
396bail:
397 if (status)
398 mlog_errno(status);
399 return status;
400}
401
402static inline u16 ocfs2_find_smallest_chain(struct ocfs2_chain_list *cl)
403{
404 u16 curr, best;
405
406 best = curr = 0;
407 while (curr < le16_to_cpu(cl->cl_count)) {
408 if (le32_to_cpu(cl->cl_recs[best].c_total) >
409 le32_to_cpu(cl->cl_recs[curr].c_total))
410 best = curr;
411 curr++;
412 }
413 return best;
414}
415
416static struct buffer_head *
417ocfs2_block_group_alloc_contig(struct ocfs2_super *osb, handle_t *handle,
418 struct inode *alloc_inode,
419 struct ocfs2_alloc_context *ac,
420 struct ocfs2_chain_list *cl)
421{
422 int status;
423 u32 bit_off, num_bits;
424 u64 bg_blkno;
425 struct buffer_head *bg_bh;
426 unsigned int alloc_rec = ocfs2_find_smallest_chain(cl);
427
428 status = ocfs2_claim_clusters(handle, ac,
429 le16_to_cpu(cl->cl_cpg), &bit_off,
430 &num_bits);
431 if (status < 0) {
432 if (status != -ENOSPC)
433 mlog_errno(status);
434 goto bail;
435 }
436
437 /* setup the group */
438 bg_blkno = ocfs2_clusters_to_blocks(osb->sb, bit_off);
439 trace_ocfs2_block_group_alloc_contig(
440 (unsigned long long)bg_blkno, alloc_rec);
441
442 bg_bh = sb_getblk(osb->sb, bg_blkno);
443 if (!bg_bh) {
444 status = -ENOMEM;
445 mlog_errno(status);
446 goto bail;
447 }
448 ocfs2_set_new_buffer_uptodate(INODE_CACHE(alloc_inode), bg_bh);
449
450 status = ocfs2_block_group_fill(handle, alloc_inode, bg_bh,
451 bg_blkno, num_bits, alloc_rec, cl);
452 if (status < 0) {
453 brelse(bg_bh);
454 mlog_errno(status);
455 }
456
457bail:
458 return status ? ERR_PTR(status) : bg_bh;
459}
460
461static int ocfs2_block_group_claim_bits(struct ocfs2_super *osb,
462 handle_t *handle,
463 struct ocfs2_alloc_context *ac,
464 unsigned int min_bits,
465 u32 *bit_off, u32 *num_bits)
466{
467 int status = 0;
468
469 while (min_bits) {
470 status = ocfs2_claim_clusters(handle, ac, min_bits,
471 bit_off, num_bits);
472 if (status != -ENOSPC)
473 break;
474
475 min_bits >>= 1;
476 }
477
478 return status;
479}
480
481static int ocfs2_block_group_grow_discontig(handle_t *handle,
482 struct inode *alloc_inode,
483 struct buffer_head *bg_bh,
484 struct ocfs2_alloc_context *ac,
485 struct ocfs2_chain_list *cl,
486 unsigned int min_bits)
487{
488 int status;
489 struct ocfs2_super *osb = OCFS2_SB(alloc_inode->i_sb);
490 struct ocfs2_group_desc *bg =
491 (struct ocfs2_group_desc *)bg_bh->b_data;
492 unsigned int needed = le16_to_cpu(cl->cl_cpg) -
493 le16_to_cpu(bg->bg_bits) / le16_to_cpu(cl->cl_bpc);
494 u32 p_cpos, clusters;
495 u64 p_blkno;
496 struct ocfs2_extent_list *el = &bg->bg_list;
497
498 status = ocfs2_journal_access_gd(handle,
499 INODE_CACHE(alloc_inode),
500 bg_bh,
501 OCFS2_JOURNAL_ACCESS_CREATE);
502 if (status < 0) {
503 mlog_errno(status);
504 goto bail;
505 }
506
507 while ((needed > 0) && (le16_to_cpu(el->l_next_free_rec) <
508 le16_to_cpu(el->l_count))) {
509 if (min_bits > needed)
510 min_bits = needed;
511 status = ocfs2_block_group_claim_bits(osb, handle, ac,
512 min_bits, &p_cpos,
513 &clusters);
514 if (status < 0) {
515 if (status != -ENOSPC)
516 mlog_errno(status);
517 goto bail;
518 }
519 p_blkno = ocfs2_clusters_to_blocks(osb->sb, p_cpos);
520 ocfs2_bg_discontig_add_extent(osb, bg, cl, p_blkno,
521 clusters);
522
523 min_bits = clusters;
524 needed = le16_to_cpu(cl->cl_cpg) -
525 le16_to_cpu(bg->bg_bits) / le16_to_cpu(cl->cl_bpc);
526 }
527
528 if (needed > 0) {
529 /*
530 * We have used up all the extent rec but can't fill up
531 * the cpg. So bail out.
532 */
533 status = -ENOSPC;
534 goto bail;
535 }
536
537 ocfs2_journal_dirty(handle, bg_bh);
538
539bail:
540 return status;
541}
542
543static void ocfs2_bg_alloc_cleanup(handle_t *handle,
544 struct ocfs2_alloc_context *cluster_ac,
545 struct inode *alloc_inode,
546 struct buffer_head *bg_bh)
547{
548 int i, ret;
549 struct ocfs2_group_desc *bg;
550 struct ocfs2_extent_list *el;
551 struct ocfs2_extent_rec *rec;
552
553 if (!bg_bh)
554 return;
555
556 bg = (struct ocfs2_group_desc *)bg_bh->b_data;
557 el = &bg->bg_list;
558 for (i = 0; i < le16_to_cpu(el->l_next_free_rec); i++) {
559 rec = &el->l_recs[i];
560 ret = ocfs2_free_clusters(handle, cluster_ac->ac_inode,
561 cluster_ac->ac_bh,
562 le64_to_cpu(rec->e_blkno),
563 le16_to_cpu(rec->e_leaf_clusters));
564 if (ret)
565 mlog_errno(ret);
566 /* Try all the clusters to free */
567 }
568
569 ocfs2_remove_from_cache(INODE_CACHE(alloc_inode), bg_bh);
570 brelse(bg_bh);
571}
572
573static struct buffer_head *
574ocfs2_block_group_alloc_discontig(handle_t *handle,
575 struct inode *alloc_inode,
576 struct ocfs2_alloc_context *ac,
577 struct ocfs2_chain_list *cl)
578{
579 int status;
580 u32 bit_off, num_bits;
581 u64 bg_blkno;
582 unsigned int min_bits = le16_to_cpu(cl->cl_cpg) >> 1;
583 struct buffer_head *bg_bh = NULL;
584 unsigned int alloc_rec = ocfs2_find_smallest_chain(cl);
585 struct ocfs2_super *osb = OCFS2_SB(alloc_inode->i_sb);
586
587 if (!ocfs2_supports_discontig_bg(osb)) {
588 status = -ENOSPC;
589 goto bail;
590 }
591
592 status = ocfs2_extend_trans(handle,
593 ocfs2_calc_bg_discontig_credits(osb->sb));
594 if (status) {
595 mlog_errno(status);
596 goto bail;
597 }
598
599 /*
600 * We're going to be grabbing from multiple cluster groups.
601 * We don't have enough credits to relink them all, and the
602 * cluster groups will be staying in cache for the duration of
603 * this operation.
604 */
605 ac->ac_disable_chain_relink = 1;
606
607 /* Claim the first region */
608 status = ocfs2_block_group_claim_bits(osb, handle, ac, min_bits,
609 &bit_off, &num_bits);
610 if (status < 0) {
611 if (status != -ENOSPC)
612 mlog_errno(status);
613 goto bail;
614 }
615 min_bits = num_bits;
616
617 /* setup the group */
618 bg_blkno = ocfs2_clusters_to_blocks(osb->sb, bit_off);
619 trace_ocfs2_block_group_alloc_discontig(
620 (unsigned long long)bg_blkno, alloc_rec);
621
622 bg_bh = sb_getblk(osb->sb, bg_blkno);
623 if (!bg_bh) {
624 status = -ENOMEM;
625 mlog_errno(status);
626 goto bail;
627 }
628 ocfs2_set_new_buffer_uptodate(INODE_CACHE(alloc_inode), bg_bh);
629
630 status = ocfs2_block_group_fill(handle, alloc_inode, bg_bh,
631 bg_blkno, num_bits, alloc_rec, cl);
632 if (status < 0) {
633 mlog_errno(status);
634 goto bail;
635 }
636
637 status = ocfs2_block_group_grow_discontig(handle, alloc_inode,
638 bg_bh, ac, cl, min_bits);
639 if (status)
640 mlog_errno(status);
641
642bail:
643 if (status)
644 ocfs2_bg_alloc_cleanup(handle, ac, alloc_inode, bg_bh);
645 return status ? ERR_PTR(status) : bg_bh;
646}
647
648/*
649 * We expect the block group allocator to already be locked.
650 */
651static int ocfs2_block_group_alloc(struct ocfs2_super *osb,
652 struct inode *alloc_inode,
653 struct buffer_head *bh,
654 u64 max_block,
655 u64 *last_alloc_group,
656 int flags)
657{
658 int status, credits;
659 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) bh->b_data;
660 struct ocfs2_chain_list *cl;
661 struct ocfs2_alloc_context *ac = NULL;
662 handle_t *handle = NULL;
663 u16 alloc_rec;
664 struct buffer_head *bg_bh = NULL;
665 struct ocfs2_group_desc *bg;
666
667 BUG_ON(ocfs2_is_cluster_bitmap(alloc_inode));
668
669 cl = &fe->id2.i_chain;
670 status = ocfs2_reserve_clusters_with_limit(osb,
671 le16_to_cpu(cl->cl_cpg),
672 max_block, flags, &ac);
673 if (status < 0) {
674 if (status != -ENOSPC)
675 mlog_errno(status);
676 goto bail;
677 }
678
679 credits = ocfs2_calc_group_alloc_credits(osb->sb,
680 le16_to_cpu(cl->cl_cpg));
681 handle = ocfs2_start_trans(osb, credits);
682 if (IS_ERR(handle)) {
683 status = PTR_ERR(handle);
684 handle = NULL;
685 mlog_errno(status);
686 goto bail;
687 }
688
689 if (last_alloc_group && *last_alloc_group != 0) {
690 trace_ocfs2_block_group_alloc(
691 (unsigned long long)*last_alloc_group);
692 ac->ac_last_group = *last_alloc_group;
693 }
694
695 bg_bh = ocfs2_block_group_alloc_contig(osb, handle, alloc_inode,
696 ac, cl);
697 if (PTR_ERR(bg_bh) == -ENOSPC)
698 bg_bh = ocfs2_block_group_alloc_discontig(handle,
699 alloc_inode,
700 ac, cl);
701 if (IS_ERR(bg_bh)) {
702 status = PTR_ERR(bg_bh);
703 bg_bh = NULL;
704 if (status != -ENOSPC)
705 mlog_errno(status);
706 goto bail;
707 }
708 bg = (struct ocfs2_group_desc *) bg_bh->b_data;
709
710 status = ocfs2_journal_access_di(handle, INODE_CACHE(alloc_inode),
711 bh, OCFS2_JOURNAL_ACCESS_WRITE);
712 if (status < 0) {
713 mlog_errno(status);
714 goto bail;
715 }
716
717 alloc_rec = le16_to_cpu(bg->bg_chain);
718 le32_add_cpu(&cl->cl_recs[alloc_rec].c_free,
719 le16_to_cpu(bg->bg_free_bits_count));
720 le32_add_cpu(&cl->cl_recs[alloc_rec].c_total,
721 le16_to_cpu(bg->bg_bits));
722 cl->cl_recs[alloc_rec].c_blkno = bg->bg_blkno;
723 if (le16_to_cpu(cl->cl_next_free_rec) < le16_to_cpu(cl->cl_count))
724 le16_add_cpu(&cl->cl_next_free_rec, 1);
725
726 le32_add_cpu(&fe->id1.bitmap1.i_used, le16_to_cpu(bg->bg_bits) -
727 le16_to_cpu(bg->bg_free_bits_count));
728 le32_add_cpu(&fe->id1.bitmap1.i_total, le16_to_cpu(bg->bg_bits));
729 le32_add_cpu(&fe->i_clusters, le16_to_cpu(cl->cl_cpg));
730
731 ocfs2_journal_dirty(handle, bh);
732
733 spin_lock(&OCFS2_I(alloc_inode)->ip_lock);
734 OCFS2_I(alloc_inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
735 fe->i_size = cpu_to_le64(ocfs2_clusters_to_bytes(alloc_inode->i_sb,
736 le32_to_cpu(fe->i_clusters)));
737 spin_unlock(&OCFS2_I(alloc_inode)->ip_lock);
738 i_size_write(alloc_inode, le64_to_cpu(fe->i_size));
739 alloc_inode->i_blocks = ocfs2_inode_sector_count(alloc_inode);
740 ocfs2_update_inode_fsync_trans(handle, alloc_inode, 0);
741
742 status = 0;
743
744 /* save the new last alloc group so that the caller can cache it. */
745 if (last_alloc_group)
746 *last_alloc_group = ac->ac_last_group;
747
748bail:
749 if (handle)
750 ocfs2_commit_trans(osb, handle);
751
752 if (ac)
753 ocfs2_free_alloc_context(ac);
754
755 brelse(bg_bh);
756
757 if (status)
758 mlog_errno(status);
759 return status;
760}
761
762static int ocfs2_reserve_suballoc_bits(struct ocfs2_super *osb,
763 struct ocfs2_alloc_context *ac,
764 int type,
765 u32 slot,
766 u64 *last_alloc_group,
767 int flags)
768{
769 int status;
770 u32 bits_wanted = ac->ac_bits_wanted;
771 struct inode *alloc_inode;
772 struct buffer_head *bh = NULL;
773 struct ocfs2_dinode *fe;
774 u32 free_bits;
775
776 alloc_inode = ocfs2_get_system_file_inode(osb, type, slot);
777 if (!alloc_inode) {
778 mlog_errno(-EINVAL);
779 return -EINVAL;
780 }
781
782 inode_lock(alloc_inode);
783
784 status = ocfs2_inode_lock(alloc_inode, &bh, 1);
785 if (status < 0) {
786 inode_unlock(alloc_inode);
787 iput(alloc_inode);
788
789 mlog_errno(status);
790 return status;
791 }
792
793 ac->ac_inode = alloc_inode;
794 ac->ac_alloc_slot = slot;
795
796 fe = (struct ocfs2_dinode *) bh->b_data;
797
798 /* The bh was validated by the inode read inside
799 * ocfs2_inode_lock(). Any corruption is a code bug. */
800 BUG_ON(!OCFS2_IS_VALID_DINODE(fe));
801
802 if (!(fe->i_flags & cpu_to_le32(OCFS2_CHAIN_FL))) {
803 status = ocfs2_error(alloc_inode->i_sb,
804 "Invalid chain allocator %llu\n",
805 (unsigned long long)le64_to_cpu(fe->i_blkno));
806 goto bail;
807 }
808
809 free_bits = le32_to_cpu(fe->id1.bitmap1.i_total) -
810 le32_to_cpu(fe->id1.bitmap1.i_used);
811
812 if (bits_wanted > free_bits) {
813 /* cluster bitmap never grows */
814 if (ocfs2_is_cluster_bitmap(alloc_inode)) {
815 trace_ocfs2_reserve_suballoc_bits_nospc(bits_wanted,
816 free_bits);
817 status = -ENOSPC;
818 goto bail;
819 }
820
821 if (!(flags & ALLOC_NEW_GROUP)) {
822 trace_ocfs2_reserve_suballoc_bits_no_new_group(
823 slot, bits_wanted, free_bits);
824 status = -ENOSPC;
825 goto bail;
826 }
827
828 status = ocfs2_block_group_alloc(osb, alloc_inode, bh,
829 ac->ac_max_block,
830 last_alloc_group, flags);
831 if (status < 0) {
832 if (status != -ENOSPC)
833 mlog_errno(status);
834 goto bail;
835 }
836 atomic_inc(&osb->alloc_stats.bg_extends);
837
838 /* You should never ask for this much metadata */
839 BUG_ON(bits_wanted >
840 (le32_to_cpu(fe->id1.bitmap1.i_total)
841 - le32_to_cpu(fe->id1.bitmap1.i_used)));
842 }
843
844 get_bh(bh);
845 ac->ac_bh = bh;
846bail:
847 brelse(bh);
848
849 if (status)
850 mlog_errno(status);
851 return status;
852}
853
854static void ocfs2_init_inode_steal_slot(struct ocfs2_super *osb)
855{
856 spin_lock(&osb->osb_lock);
857 osb->s_inode_steal_slot = OCFS2_INVALID_SLOT;
858 spin_unlock(&osb->osb_lock);
859 atomic_set(&osb->s_num_inodes_stolen, 0);
860}
861
862static void ocfs2_init_meta_steal_slot(struct ocfs2_super *osb)
863{
864 spin_lock(&osb->osb_lock);
865 osb->s_meta_steal_slot = OCFS2_INVALID_SLOT;
866 spin_unlock(&osb->osb_lock);
867 atomic_set(&osb->s_num_meta_stolen, 0);
868}
869
870void ocfs2_init_steal_slots(struct ocfs2_super *osb)
871{
872 ocfs2_init_inode_steal_slot(osb);
873 ocfs2_init_meta_steal_slot(osb);
874}
875
876static void __ocfs2_set_steal_slot(struct ocfs2_super *osb, int slot, int type)
877{
878 spin_lock(&osb->osb_lock);
879 if (type == INODE_ALLOC_SYSTEM_INODE)
880 osb->s_inode_steal_slot = (u16)slot;
881 else if (type == EXTENT_ALLOC_SYSTEM_INODE)
882 osb->s_meta_steal_slot = (u16)slot;
883 spin_unlock(&osb->osb_lock);
884}
885
886static int __ocfs2_get_steal_slot(struct ocfs2_super *osb, int type)
887{
888 int slot = OCFS2_INVALID_SLOT;
889
890 spin_lock(&osb->osb_lock);
891 if (type == INODE_ALLOC_SYSTEM_INODE)
892 slot = osb->s_inode_steal_slot;
893 else if (type == EXTENT_ALLOC_SYSTEM_INODE)
894 slot = osb->s_meta_steal_slot;
895 spin_unlock(&osb->osb_lock);
896
897 return slot;
898}
899
900static int ocfs2_get_inode_steal_slot(struct ocfs2_super *osb)
901{
902 return __ocfs2_get_steal_slot(osb, INODE_ALLOC_SYSTEM_INODE);
903}
904
905static int ocfs2_get_meta_steal_slot(struct ocfs2_super *osb)
906{
907 return __ocfs2_get_steal_slot(osb, EXTENT_ALLOC_SYSTEM_INODE);
908}
909
910static int ocfs2_steal_resource(struct ocfs2_super *osb,
911 struct ocfs2_alloc_context *ac,
912 int type)
913{
914 int i, status = -ENOSPC;
915 int slot = __ocfs2_get_steal_slot(osb, type);
916
917 /* Start to steal resource from the first slot after ours. */
918 if (slot == OCFS2_INVALID_SLOT)
919 slot = osb->slot_num + 1;
920
921 for (i = 0; i < osb->max_slots; i++, slot++) {
922 if (slot == osb->max_slots)
923 slot = 0;
924
925 if (slot == osb->slot_num)
926 continue;
927
928 status = ocfs2_reserve_suballoc_bits(osb, ac,
929 type,
930 (u32)slot, NULL,
931 NOT_ALLOC_NEW_GROUP);
932 if (status >= 0) {
933 __ocfs2_set_steal_slot(osb, slot, type);
934 break;
935 }
936
937 ocfs2_free_ac_resource(ac);
938 }
939
940 return status;
941}
942
943static int ocfs2_steal_inode(struct ocfs2_super *osb,
944 struct ocfs2_alloc_context *ac)
945{
946 return ocfs2_steal_resource(osb, ac, INODE_ALLOC_SYSTEM_INODE);
947}
948
949static int ocfs2_steal_meta(struct ocfs2_super *osb,
950 struct ocfs2_alloc_context *ac)
951{
952 return ocfs2_steal_resource(osb, ac, EXTENT_ALLOC_SYSTEM_INODE);
953}
954
955int ocfs2_reserve_new_metadata_blocks(struct ocfs2_super *osb,
956 int blocks,
957 struct ocfs2_alloc_context **ac)
958{
959 int status;
960 int slot = ocfs2_get_meta_steal_slot(osb);
961
962 *ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
963 if (!(*ac)) {
964 status = -ENOMEM;
965 mlog_errno(status);
966 goto bail;
967 }
968
969 (*ac)->ac_bits_wanted = blocks;
970 (*ac)->ac_which = OCFS2_AC_USE_META;
971 (*ac)->ac_group_search = ocfs2_block_group_search;
972
973 if (slot != OCFS2_INVALID_SLOT &&
974 atomic_read(&osb->s_num_meta_stolen) < OCFS2_MAX_TO_STEAL)
975 goto extent_steal;
976
977 atomic_set(&osb->s_num_meta_stolen, 0);
978 status = ocfs2_reserve_suballoc_bits(osb, (*ac),
979 EXTENT_ALLOC_SYSTEM_INODE,
980 (u32)osb->slot_num, NULL,
981 ALLOC_GROUPS_FROM_GLOBAL|ALLOC_NEW_GROUP);
982
983
984 if (status >= 0) {
985 status = 0;
986 if (slot != OCFS2_INVALID_SLOT)
987 ocfs2_init_meta_steal_slot(osb);
988 goto bail;
989 } else if (status < 0 && status != -ENOSPC) {
990 mlog_errno(status);
991 goto bail;
992 }
993
994 ocfs2_free_ac_resource(*ac);
995
996extent_steal:
997 status = ocfs2_steal_meta(osb, *ac);
998 atomic_inc(&osb->s_num_meta_stolen);
999 if (status < 0) {
1000 if (status != -ENOSPC)
1001 mlog_errno(status);
1002 goto bail;
1003 }
1004
1005 status = 0;
1006bail:
1007 if ((status < 0) && *ac) {
1008 ocfs2_free_alloc_context(*ac);
1009 *ac = NULL;
1010 }
1011
1012 if (status)
1013 mlog_errno(status);
1014 return status;
1015}
1016
1017int ocfs2_reserve_new_metadata(struct ocfs2_super *osb,
1018 struct ocfs2_extent_list *root_el,
1019 struct ocfs2_alloc_context **ac)
1020{
1021 return ocfs2_reserve_new_metadata_blocks(osb,
1022 ocfs2_extend_meta_needed(root_el),
1023 ac);
1024}
1025
1026int ocfs2_reserve_new_inode(struct ocfs2_super *osb,
1027 struct ocfs2_alloc_context **ac)
1028{
1029 int status;
1030 int slot = ocfs2_get_inode_steal_slot(osb);
1031 u64 alloc_group;
1032
1033 *ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
1034 if (!(*ac)) {
1035 status = -ENOMEM;
1036 mlog_errno(status);
1037 goto bail;
1038 }
1039
1040 (*ac)->ac_bits_wanted = 1;
1041 (*ac)->ac_which = OCFS2_AC_USE_INODE;
1042
1043 (*ac)->ac_group_search = ocfs2_block_group_search;
1044
1045 /*
1046 * stat(2) can't handle i_ino > 32bits, so we tell the
1047 * lower levels not to allocate us a block group past that
1048 * limit. The 'inode64' mount option avoids this behavior.
1049 */
1050 if (!(osb->s_mount_opt & OCFS2_MOUNT_INODE64))
1051 (*ac)->ac_max_block = (u32)~0U;
1052
1053 /*
1054 * slot is set when we successfully steal inode from other nodes.
1055 * It is reset in 3 places:
1056 * 1. when we flush the truncate log
1057 * 2. when we complete local alloc recovery.
1058 * 3. when we successfully allocate from our own slot.
1059 * After it is set, we will go on stealing inodes until we find the
1060 * need to check our slots to see whether there is some space for us.
1061 */
1062 if (slot != OCFS2_INVALID_SLOT &&
1063 atomic_read(&osb->s_num_inodes_stolen) < OCFS2_MAX_TO_STEAL)
1064 goto inode_steal;
1065
1066 atomic_set(&osb->s_num_inodes_stolen, 0);
1067 alloc_group = osb->osb_inode_alloc_group;
1068 status = ocfs2_reserve_suballoc_bits(osb, *ac,
1069 INODE_ALLOC_SYSTEM_INODE,
1070 (u32)osb->slot_num,
1071 &alloc_group,
1072 ALLOC_NEW_GROUP |
1073 ALLOC_GROUPS_FROM_GLOBAL);
1074 if (status >= 0) {
1075 status = 0;
1076
1077 spin_lock(&osb->osb_lock);
1078 osb->osb_inode_alloc_group = alloc_group;
1079 spin_unlock(&osb->osb_lock);
1080 trace_ocfs2_reserve_new_inode_new_group(
1081 (unsigned long long)alloc_group);
1082
1083 /*
1084 * Some inodes must be freed by us, so try to allocate
1085 * from our own next time.
1086 */
1087 if (slot != OCFS2_INVALID_SLOT)
1088 ocfs2_init_inode_steal_slot(osb);
1089 goto bail;
1090 } else if (status < 0 && status != -ENOSPC) {
1091 mlog_errno(status);
1092 goto bail;
1093 }
1094
1095 ocfs2_free_ac_resource(*ac);
1096
1097inode_steal:
1098 status = ocfs2_steal_inode(osb, *ac);
1099 atomic_inc(&osb->s_num_inodes_stolen);
1100 if (status < 0) {
1101 if (status != -ENOSPC)
1102 mlog_errno(status);
1103 goto bail;
1104 }
1105
1106 status = 0;
1107bail:
1108 if ((status < 0) && *ac) {
1109 ocfs2_free_alloc_context(*ac);
1110 *ac = NULL;
1111 }
1112
1113 if (status)
1114 mlog_errno(status);
1115 return status;
1116}
1117
1118/* local alloc code has to do the same thing, so rather than do this
1119 * twice.. */
1120int ocfs2_reserve_cluster_bitmap_bits(struct ocfs2_super *osb,
1121 struct ocfs2_alloc_context *ac)
1122{
1123 int status;
1124
1125 ac->ac_which = OCFS2_AC_USE_MAIN;
1126 ac->ac_group_search = ocfs2_cluster_group_search;
1127
1128 status = ocfs2_reserve_suballoc_bits(osb, ac,
1129 GLOBAL_BITMAP_SYSTEM_INODE,
1130 OCFS2_INVALID_SLOT, NULL,
1131 ALLOC_NEW_GROUP);
1132 if (status < 0 && status != -ENOSPC)
1133 mlog_errno(status);
1134
1135 return status;
1136}
1137
1138/* Callers don't need to care which bitmap (local alloc or main) to
1139 * use so we figure it out for them, but unfortunately this clutters
1140 * things a bit. */
1141static int ocfs2_reserve_clusters_with_limit(struct ocfs2_super *osb,
1142 u32 bits_wanted, u64 max_block,
1143 int flags,
1144 struct ocfs2_alloc_context **ac)
1145{
1146 int status, ret = 0;
1147 int retried = 0;
1148
1149 *ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
1150 if (!(*ac)) {
1151 status = -ENOMEM;
1152 mlog_errno(status);
1153 goto bail;
1154 }
1155
1156 (*ac)->ac_bits_wanted = bits_wanted;
1157 (*ac)->ac_max_block = max_block;
1158
1159 status = -ENOSPC;
1160 if (!(flags & ALLOC_GROUPS_FROM_GLOBAL) &&
1161 ocfs2_alloc_should_use_local(osb, bits_wanted)) {
1162 status = ocfs2_reserve_local_alloc_bits(osb,
1163 bits_wanted,
1164 *ac);
1165 if ((status < 0) && (status != -ENOSPC)) {
1166 mlog_errno(status);
1167 goto bail;
1168 }
1169 }
1170
1171 if (status == -ENOSPC) {
1172retry:
1173 status = ocfs2_reserve_cluster_bitmap_bits(osb, *ac);
1174 /* Retry if there is sufficient space cached in truncate log */
1175 if (status == -ENOSPC && !retried) {
1176 retried = 1;
1177 ocfs2_inode_unlock((*ac)->ac_inode, 1);
1178 inode_unlock((*ac)->ac_inode);
1179
1180 ret = ocfs2_try_to_free_truncate_log(osb, bits_wanted);
1181 if (ret == 1) {
1182 iput((*ac)->ac_inode);
1183 (*ac)->ac_inode = NULL;
1184 goto retry;
1185 }
1186
1187 if (ret < 0)
1188 mlog_errno(ret);
1189
1190 inode_lock((*ac)->ac_inode);
1191 ret = ocfs2_inode_lock((*ac)->ac_inode, NULL, 1);
1192 if (ret < 0) {
1193 mlog_errno(ret);
1194 inode_unlock((*ac)->ac_inode);
1195 iput((*ac)->ac_inode);
1196 (*ac)->ac_inode = NULL;
1197 goto bail;
1198 }
1199 }
1200 if (status < 0) {
1201 if (status != -ENOSPC)
1202 mlog_errno(status);
1203 goto bail;
1204 }
1205 }
1206
1207 status = 0;
1208bail:
1209 if ((status < 0) && *ac) {
1210 ocfs2_free_alloc_context(*ac);
1211 *ac = NULL;
1212 }
1213
1214 if (status)
1215 mlog_errno(status);
1216 return status;
1217}
1218
1219int ocfs2_reserve_clusters(struct ocfs2_super *osb,
1220 u32 bits_wanted,
1221 struct ocfs2_alloc_context **ac)
1222{
1223 return ocfs2_reserve_clusters_with_limit(osb, bits_wanted, 0,
1224 ALLOC_NEW_GROUP, ac);
1225}
1226
1227/*
1228 * More or less lifted from ext3. I'll leave their description below:
1229 *
1230 * "For ext3 allocations, we must not reuse any blocks which are
1231 * allocated in the bitmap buffer's "last committed data" copy. This
1232 * prevents deletes from freeing up the page for reuse until we have
1233 * committed the delete transaction.
1234 *
1235 * If we didn't do this, then deleting something and reallocating it as
1236 * data would allow the old block to be overwritten before the
1237 * transaction committed (because we force data to disk before commit).
1238 * This would lead to corruption if we crashed between overwriting the
1239 * data and committing the delete.
1240 *
1241 * @@@ We may want to make this allocation behaviour conditional on
1242 * data-writes at some point, and disable it for metadata allocations or
1243 * sync-data inodes."
1244 *
1245 * Note: OCFS2 already does this differently for metadata vs data
1246 * allocations, as those bitmaps are separate and undo access is never
1247 * called on a metadata group descriptor.
1248 */
1249static int ocfs2_test_bg_bit_allocatable(struct buffer_head *bg_bh,
1250 int nr)
1251{
1252 struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data;
1253 struct journal_head *jh;
1254 int ret;
1255
1256 if (ocfs2_test_bit(nr, (unsigned long *)bg->bg_bitmap))
1257 return 0;
1258
1259 jh = jbd2_journal_grab_journal_head(bg_bh);
1260 if (!jh)
1261 return 1;
1262
1263 spin_lock(&jh->b_state_lock);
1264 bg = (struct ocfs2_group_desc *) jh->b_committed_data;
1265 if (bg)
1266 ret = !ocfs2_test_bit(nr, (unsigned long *)bg->bg_bitmap);
1267 else
1268 ret = 1;
1269 spin_unlock(&jh->b_state_lock);
1270 jbd2_journal_put_journal_head(jh);
1271
1272 return ret;
1273}
1274
1275static int ocfs2_block_group_find_clear_bits(struct ocfs2_super *osb,
1276 struct buffer_head *bg_bh,
1277 unsigned int bits_wanted,
1278 unsigned int total_bits,
1279 struct ocfs2_suballoc_result *res)
1280{
1281 void *bitmap;
1282 u16 best_offset, best_size;
1283 int offset, start, found, status = 0;
1284 struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data;
1285
1286 /* Callers got this descriptor from
1287 * ocfs2_read_group_descriptor(). Any corruption is a code bug. */
1288 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
1289
1290 found = start = best_offset = best_size = 0;
1291 bitmap = bg->bg_bitmap;
1292
1293 while((offset = ocfs2_find_next_zero_bit(bitmap, total_bits, start)) != -1) {
1294 if (offset == total_bits)
1295 break;
1296
1297 if (!ocfs2_test_bg_bit_allocatable(bg_bh, offset)) {
1298 /* We found a zero, but we can't use it as it
1299 * hasn't been put to disk yet! */
1300 found = 0;
1301 start = offset + 1;
1302 } else if (offset == start) {
1303 /* we found a zero */
1304 found++;
1305 /* move start to the next bit to test */
1306 start++;
1307 } else {
1308 /* got a zero after some ones */
1309 found = 1;
1310 start = offset + 1;
1311 }
1312 if (found > best_size) {
1313 best_size = found;
1314 best_offset = start - found;
1315 }
1316 /* we got everything we needed */
1317 if (found == bits_wanted) {
1318 /* mlog(0, "Found it all!\n"); */
1319 break;
1320 }
1321 }
1322
1323 if (best_size) {
1324 res->sr_bit_offset = best_offset;
1325 res->sr_bits = best_size;
1326 } else {
1327 status = -ENOSPC;
1328 /* No error log here -- see the comment above
1329 * ocfs2_test_bg_bit_allocatable */
1330 }
1331
1332 return status;
1333}
1334
1335int ocfs2_block_group_set_bits(handle_t *handle,
1336 struct inode *alloc_inode,
1337 struct ocfs2_group_desc *bg,
1338 struct buffer_head *group_bh,
1339 unsigned int bit_off,
1340 unsigned int num_bits)
1341{
1342 int status;
1343 void *bitmap = bg->bg_bitmap;
1344 int journal_type = OCFS2_JOURNAL_ACCESS_WRITE;
1345
1346 /* All callers get the descriptor via
1347 * ocfs2_read_group_descriptor(). Any corruption is a code bug. */
1348 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
1349 BUG_ON(le16_to_cpu(bg->bg_free_bits_count) < num_bits);
1350
1351 trace_ocfs2_block_group_set_bits(bit_off, num_bits);
1352
1353 if (ocfs2_is_cluster_bitmap(alloc_inode))
1354 journal_type = OCFS2_JOURNAL_ACCESS_UNDO;
1355
1356 status = ocfs2_journal_access_gd(handle,
1357 INODE_CACHE(alloc_inode),
1358 group_bh,
1359 journal_type);
1360 if (status < 0) {
1361 mlog_errno(status);
1362 goto bail;
1363 }
1364
1365 le16_add_cpu(&bg->bg_free_bits_count, -num_bits);
1366 if (le16_to_cpu(bg->bg_free_bits_count) > le16_to_cpu(bg->bg_bits)) {
1367 return ocfs2_error(alloc_inode->i_sb, "Group descriptor # %llu has bit count %u but claims %u are freed. num_bits %d\n",
1368 (unsigned long long)le64_to_cpu(bg->bg_blkno),
1369 le16_to_cpu(bg->bg_bits),
1370 le16_to_cpu(bg->bg_free_bits_count),
1371 num_bits);
1372 }
1373 while(num_bits--)
1374 ocfs2_set_bit(bit_off++, bitmap);
1375
1376 ocfs2_journal_dirty(handle, group_bh);
1377
1378bail:
1379 return status;
1380}
1381
1382/* find the one with the most empty bits */
1383static inline u16 ocfs2_find_victim_chain(struct ocfs2_chain_list *cl)
1384{
1385 u16 curr, best;
1386
1387 BUG_ON(!cl->cl_next_free_rec);
1388
1389 best = curr = 0;
1390 while (curr < le16_to_cpu(cl->cl_next_free_rec)) {
1391 if (le32_to_cpu(cl->cl_recs[curr].c_free) >
1392 le32_to_cpu(cl->cl_recs[best].c_free))
1393 best = curr;
1394 curr++;
1395 }
1396
1397 BUG_ON(best >= le16_to_cpu(cl->cl_next_free_rec));
1398 return best;
1399}
1400
1401static int ocfs2_relink_block_group(handle_t *handle,
1402 struct inode *alloc_inode,
1403 struct buffer_head *fe_bh,
1404 struct buffer_head *bg_bh,
1405 struct buffer_head *prev_bg_bh,
1406 u16 chain)
1407{
1408 int status;
1409 /* there is a really tiny chance the journal calls could fail,
1410 * but we wouldn't want inconsistent blocks in *any* case. */
1411 u64 bg_ptr, prev_bg_ptr;
1412 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) fe_bh->b_data;
1413 struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data;
1414 struct ocfs2_group_desc *prev_bg = (struct ocfs2_group_desc *) prev_bg_bh->b_data;
1415
1416 /* The caller got these descriptors from
1417 * ocfs2_read_group_descriptor(). Any corruption is a code bug. */
1418 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
1419 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(prev_bg));
1420
1421 trace_ocfs2_relink_block_group(
1422 (unsigned long long)le64_to_cpu(fe->i_blkno), chain,
1423 (unsigned long long)le64_to_cpu(bg->bg_blkno),
1424 (unsigned long long)le64_to_cpu(prev_bg->bg_blkno));
1425
1426 bg_ptr = le64_to_cpu(bg->bg_next_group);
1427 prev_bg_ptr = le64_to_cpu(prev_bg->bg_next_group);
1428
1429 status = ocfs2_journal_access_gd(handle, INODE_CACHE(alloc_inode),
1430 prev_bg_bh,
1431 OCFS2_JOURNAL_ACCESS_WRITE);
1432 if (status < 0)
1433 goto out;
1434
1435 prev_bg->bg_next_group = bg->bg_next_group;
1436 ocfs2_journal_dirty(handle, prev_bg_bh);
1437
1438 status = ocfs2_journal_access_gd(handle, INODE_CACHE(alloc_inode),
1439 bg_bh, OCFS2_JOURNAL_ACCESS_WRITE);
1440 if (status < 0)
1441 goto out_rollback_prev_bg;
1442
1443 bg->bg_next_group = fe->id2.i_chain.cl_recs[chain].c_blkno;
1444 ocfs2_journal_dirty(handle, bg_bh);
1445
1446 status = ocfs2_journal_access_di(handle, INODE_CACHE(alloc_inode),
1447 fe_bh, OCFS2_JOURNAL_ACCESS_WRITE);
1448 if (status < 0)
1449 goto out_rollback_bg;
1450
1451 fe->id2.i_chain.cl_recs[chain].c_blkno = bg->bg_blkno;
1452 ocfs2_journal_dirty(handle, fe_bh);
1453
1454out:
1455 if (status < 0)
1456 mlog_errno(status);
1457 return status;
1458
1459out_rollback_bg:
1460 bg->bg_next_group = cpu_to_le64(bg_ptr);
1461out_rollback_prev_bg:
1462 prev_bg->bg_next_group = cpu_to_le64(prev_bg_ptr);
1463 goto out;
1464}
1465
1466static inline int ocfs2_block_group_reasonably_empty(struct ocfs2_group_desc *bg,
1467 u32 wanted)
1468{
1469 return le16_to_cpu(bg->bg_free_bits_count) > wanted;
1470}
1471
1472/* return 0 on success, -ENOSPC to keep searching and any other < 0
1473 * value on error. */
1474static int ocfs2_cluster_group_search(struct inode *inode,
1475 struct buffer_head *group_bh,
1476 u32 bits_wanted, u32 min_bits,
1477 u64 max_block,
1478 struct ocfs2_suballoc_result *res)
1479{
1480 int search = -ENOSPC;
1481 int ret;
1482 u64 blkoff;
1483 struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *) group_bh->b_data;
1484 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1485 unsigned int max_bits, gd_cluster_off;
1486
1487 BUG_ON(!ocfs2_is_cluster_bitmap(inode));
1488
1489 if (gd->bg_free_bits_count) {
1490 max_bits = le16_to_cpu(gd->bg_bits);
1491
1492 /* Tail groups in cluster bitmaps which aren't cpg
1493 * aligned are prone to partial extension by a failed
1494 * fs resize. If the file system resize never got to
1495 * update the dinode cluster count, then we don't want
1496 * to trust any clusters past it, regardless of what
1497 * the group descriptor says. */
1498 gd_cluster_off = ocfs2_blocks_to_clusters(inode->i_sb,
1499 le64_to_cpu(gd->bg_blkno));
1500 if ((gd_cluster_off + max_bits) >
1501 OCFS2_I(inode)->ip_clusters) {
1502 max_bits = OCFS2_I(inode)->ip_clusters - gd_cluster_off;
1503 trace_ocfs2_cluster_group_search_wrong_max_bits(
1504 (unsigned long long)le64_to_cpu(gd->bg_blkno),
1505 le16_to_cpu(gd->bg_bits),
1506 OCFS2_I(inode)->ip_clusters, max_bits);
1507 }
1508
1509 ret = ocfs2_block_group_find_clear_bits(osb,
1510 group_bh, bits_wanted,
1511 max_bits, res);
1512 if (ret)
1513 return ret;
1514
1515 if (max_block) {
1516 blkoff = ocfs2_clusters_to_blocks(inode->i_sb,
1517 gd_cluster_off +
1518 res->sr_bit_offset +
1519 res->sr_bits);
1520 trace_ocfs2_cluster_group_search_max_block(
1521 (unsigned long long)blkoff,
1522 (unsigned long long)max_block);
1523 if (blkoff > max_block)
1524 return -ENOSPC;
1525 }
1526
1527 /* ocfs2_block_group_find_clear_bits() might
1528 * return success, but we still want to return
1529 * -ENOSPC unless it found the minimum number
1530 * of bits. */
1531 if (min_bits <= res->sr_bits)
1532 search = 0; /* success */
1533 else if (res->sr_bits) {
1534 /*
1535 * Don't show bits which we'll be returning
1536 * for allocation to the local alloc bitmap.
1537 */
1538 ocfs2_local_alloc_seen_free_bits(osb, res->sr_bits);
1539 }
1540 }
1541
1542 return search;
1543}
1544
1545static int ocfs2_block_group_search(struct inode *inode,
1546 struct buffer_head *group_bh,
1547 u32 bits_wanted, u32 min_bits,
1548 u64 max_block,
1549 struct ocfs2_suballoc_result *res)
1550{
1551 int ret = -ENOSPC;
1552 u64 blkoff;
1553 struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) group_bh->b_data;
1554
1555 BUG_ON(min_bits != 1);
1556 BUG_ON(ocfs2_is_cluster_bitmap(inode));
1557
1558 if (bg->bg_free_bits_count) {
1559 ret = ocfs2_block_group_find_clear_bits(OCFS2_SB(inode->i_sb),
1560 group_bh, bits_wanted,
1561 le16_to_cpu(bg->bg_bits),
1562 res);
1563 if (!ret && max_block) {
1564 blkoff = le64_to_cpu(bg->bg_blkno) +
1565 res->sr_bit_offset + res->sr_bits;
1566 trace_ocfs2_block_group_search_max_block(
1567 (unsigned long long)blkoff,
1568 (unsigned long long)max_block);
1569 if (blkoff > max_block)
1570 ret = -ENOSPC;
1571 }
1572 }
1573
1574 return ret;
1575}
1576
1577int ocfs2_alloc_dinode_update_counts(struct inode *inode,
1578 handle_t *handle,
1579 struct buffer_head *di_bh,
1580 u32 num_bits,
1581 u16 chain)
1582{
1583 int ret;
1584 u32 tmp_used;
1585 struct ocfs2_dinode *di = (struct ocfs2_dinode *) di_bh->b_data;
1586 struct ocfs2_chain_list *cl = (struct ocfs2_chain_list *) &di->id2.i_chain;
1587
1588 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
1589 OCFS2_JOURNAL_ACCESS_WRITE);
1590 if (ret < 0) {
1591 mlog_errno(ret);
1592 goto out;
1593 }
1594
1595 tmp_used = le32_to_cpu(di->id1.bitmap1.i_used);
1596 di->id1.bitmap1.i_used = cpu_to_le32(num_bits + tmp_used);
1597 le32_add_cpu(&cl->cl_recs[chain].c_free, -num_bits);
1598 ocfs2_journal_dirty(handle, di_bh);
1599
1600out:
1601 return ret;
1602}
1603
1604void ocfs2_rollback_alloc_dinode_counts(struct inode *inode,
1605 struct buffer_head *di_bh,
1606 u32 num_bits,
1607 u16 chain)
1608{
1609 u32 tmp_used;
1610 struct ocfs2_dinode *di = (struct ocfs2_dinode *) di_bh->b_data;
1611 struct ocfs2_chain_list *cl;
1612
1613 cl = (struct ocfs2_chain_list *)&di->id2.i_chain;
1614 tmp_used = le32_to_cpu(di->id1.bitmap1.i_used);
1615 di->id1.bitmap1.i_used = cpu_to_le32(tmp_used - num_bits);
1616 le32_add_cpu(&cl->cl_recs[chain].c_free, num_bits);
1617}
1618
1619static int ocfs2_bg_discontig_fix_by_rec(struct ocfs2_suballoc_result *res,
1620 struct ocfs2_extent_rec *rec,
1621 struct ocfs2_chain_list *cl)
1622{
1623 unsigned int bpc = le16_to_cpu(cl->cl_bpc);
1624 unsigned int bitoff = le32_to_cpu(rec->e_cpos) * bpc;
1625 unsigned int bitcount = le16_to_cpu(rec->e_leaf_clusters) * bpc;
1626
1627 if (res->sr_bit_offset < bitoff)
1628 return 0;
1629 if (res->sr_bit_offset >= (bitoff + bitcount))
1630 return 0;
1631 res->sr_blkno = le64_to_cpu(rec->e_blkno) +
1632 (res->sr_bit_offset - bitoff);
1633 if ((res->sr_bit_offset + res->sr_bits) > (bitoff + bitcount))
1634 res->sr_bits = (bitoff + bitcount) - res->sr_bit_offset;
1635 return 1;
1636}
1637
1638static void ocfs2_bg_discontig_fix_result(struct ocfs2_alloc_context *ac,
1639 struct ocfs2_group_desc *bg,
1640 struct ocfs2_suballoc_result *res)
1641{
1642 int i;
1643 u64 bg_blkno = res->sr_bg_blkno; /* Save off */
1644 struct ocfs2_extent_rec *rec;
1645 struct ocfs2_dinode *di = (struct ocfs2_dinode *)ac->ac_bh->b_data;
1646 struct ocfs2_chain_list *cl = &di->id2.i_chain;
1647
1648 if (ocfs2_is_cluster_bitmap(ac->ac_inode)) {
1649 res->sr_blkno = 0;
1650 return;
1651 }
1652
1653 res->sr_blkno = res->sr_bg_blkno + res->sr_bit_offset;
1654 res->sr_bg_blkno = 0; /* Clear it for contig block groups */
1655 if (!ocfs2_supports_discontig_bg(OCFS2_SB(ac->ac_inode->i_sb)) ||
1656 !bg->bg_list.l_next_free_rec)
1657 return;
1658
1659 for (i = 0; i < le16_to_cpu(bg->bg_list.l_next_free_rec); i++) {
1660 rec = &bg->bg_list.l_recs[i];
1661 if (ocfs2_bg_discontig_fix_by_rec(res, rec, cl)) {
1662 res->sr_bg_blkno = bg_blkno; /* Restore */
1663 break;
1664 }
1665 }
1666}
1667
1668static int ocfs2_search_one_group(struct ocfs2_alloc_context *ac,
1669 handle_t *handle,
1670 u32 bits_wanted,
1671 u32 min_bits,
1672 struct ocfs2_suballoc_result *res,
1673 u16 *bits_left)
1674{
1675 int ret;
1676 struct buffer_head *group_bh = NULL;
1677 struct ocfs2_group_desc *gd;
1678 struct ocfs2_dinode *di = (struct ocfs2_dinode *)ac->ac_bh->b_data;
1679 struct inode *alloc_inode = ac->ac_inode;
1680
1681 ret = ocfs2_read_group_descriptor(alloc_inode, di,
1682 res->sr_bg_blkno, &group_bh);
1683 if (ret < 0) {
1684 mlog_errno(ret);
1685 return ret;
1686 }
1687
1688 gd = (struct ocfs2_group_desc *) group_bh->b_data;
1689 ret = ac->ac_group_search(alloc_inode, group_bh, bits_wanted, min_bits,
1690 ac->ac_max_block, res);
1691 if (ret < 0) {
1692 if (ret != -ENOSPC)
1693 mlog_errno(ret);
1694 goto out;
1695 }
1696
1697 if (!ret)
1698 ocfs2_bg_discontig_fix_result(ac, gd, res);
1699
1700 /*
1701 * sr_bg_blkno might have been changed by
1702 * ocfs2_bg_discontig_fix_result
1703 */
1704 res->sr_bg_stable_blkno = group_bh->b_blocknr;
1705
1706 if (ac->ac_find_loc_only)
1707 goto out_loc_only;
1708
1709 ret = ocfs2_alloc_dinode_update_counts(alloc_inode, handle, ac->ac_bh,
1710 res->sr_bits,
1711 le16_to_cpu(gd->bg_chain));
1712 if (ret < 0) {
1713 mlog_errno(ret);
1714 goto out;
1715 }
1716
1717 ret = ocfs2_block_group_set_bits(handle, alloc_inode, gd, group_bh,
1718 res->sr_bit_offset, res->sr_bits);
1719 if (ret < 0) {
1720 ocfs2_rollback_alloc_dinode_counts(alloc_inode, ac->ac_bh,
1721 res->sr_bits,
1722 le16_to_cpu(gd->bg_chain));
1723 mlog_errno(ret);
1724 }
1725
1726out_loc_only:
1727 *bits_left = le16_to_cpu(gd->bg_free_bits_count);
1728
1729out:
1730 brelse(group_bh);
1731
1732 return ret;
1733}
1734
1735static int ocfs2_search_chain(struct ocfs2_alloc_context *ac,
1736 handle_t *handle,
1737 u32 bits_wanted,
1738 u32 min_bits,
1739 struct ocfs2_suballoc_result *res,
1740 u16 *bits_left)
1741{
1742 int status;
1743 u16 chain;
1744 u64 next_group;
1745 struct inode *alloc_inode = ac->ac_inode;
1746 struct buffer_head *group_bh = NULL;
1747 struct buffer_head *prev_group_bh = NULL;
1748 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) ac->ac_bh->b_data;
1749 struct ocfs2_chain_list *cl = (struct ocfs2_chain_list *) &fe->id2.i_chain;
1750 struct ocfs2_group_desc *bg;
1751
1752 chain = ac->ac_chain;
1753 trace_ocfs2_search_chain_begin(
1754 (unsigned long long)OCFS2_I(alloc_inode)->ip_blkno,
1755 bits_wanted, chain);
1756
1757 status = ocfs2_read_group_descriptor(alloc_inode, fe,
1758 le64_to_cpu(cl->cl_recs[chain].c_blkno),
1759 &group_bh);
1760 if (status < 0) {
1761 mlog_errno(status);
1762 goto bail;
1763 }
1764 bg = (struct ocfs2_group_desc *) group_bh->b_data;
1765
1766 status = -ENOSPC;
1767 /* for now, the chain search is a bit simplistic. We just use
1768 * the 1st group with any empty bits. */
1769 while ((status = ac->ac_group_search(alloc_inode, group_bh,
1770 bits_wanted, min_bits,
1771 ac->ac_max_block,
1772 res)) == -ENOSPC) {
1773 if (!bg->bg_next_group)
1774 break;
1775
1776 brelse(prev_group_bh);
1777 prev_group_bh = NULL;
1778
1779 next_group = le64_to_cpu(bg->bg_next_group);
1780 prev_group_bh = group_bh;
1781 group_bh = NULL;
1782 status = ocfs2_read_group_descriptor(alloc_inode, fe,
1783 next_group, &group_bh);
1784 if (status < 0) {
1785 mlog_errno(status);
1786 goto bail;
1787 }
1788 bg = (struct ocfs2_group_desc *) group_bh->b_data;
1789 }
1790 if (status < 0) {
1791 if (status != -ENOSPC)
1792 mlog_errno(status);
1793 goto bail;
1794 }
1795
1796 trace_ocfs2_search_chain_succ(
1797 (unsigned long long)le64_to_cpu(bg->bg_blkno), res->sr_bits);
1798
1799 res->sr_bg_blkno = le64_to_cpu(bg->bg_blkno);
1800
1801 BUG_ON(res->sr_bits == 0);
1802 if (!status)
1803 ocfs2_bg_discontig_fix_result(ac, bg, res);
1804
1805 /*
1806 * sr_bg_blkno might have been changed by
1807 * ocfs2_bg_discontig_fix_result
1808 */
1809 res->sr_bg_stable_blkno = group_bh->b_blocknr;
1810
1811 /*
1812 * Keep track of previous block descriptor read. When
1813 * we find a target, if we have read more than X
1814 * number of descriptors, and the target is reasonably
1815 * empty, relink him to top of his chain.
1816 *
1817 * We've read 0 extra blocks and only send one more to
1818 * the transaction, yet the next guy to search has a
1819 * much easier time.
1820 *
1821 * Do this *after* figuring out how many bits we're taking out
1822 * of our target group.
1823 */
1824 if (!ac->ac_disable_chain_relink &&
1825 (prev_group_bh) &&
1826 (ocfs2_block_group_reasonably_empty(bg, res->sr_bits))) {
1827 status = ocfs2_relink_block_group(handle, alloc_inode,
1828 ac->ac_bh, group_bh,
1829 prev_group_bh, chain);
1830 if (status < 0) {
1831 mlog_errno(status);
1832 goto bail;
1833 }
1834 }
1835
1836 if (ac->ac_find_loc_only)
1837 goto out_loc_only;
1838
1839 status = ocfs2_alloc_dinode_update_counts(alloc_inode, handle,
1840 ac->ac_bh, res->sr_bits,
1841 chain);
1842 if (status) {
1843 mlog_errno(status);
1844 goto bail;
1845 }
1846
1847 status = ocfs2_block_group_set_bits(handle,
1848 alloc_inode,
1849 bg,
1850 group_bh,
1851 res->sr_bit_offset,
1852 res->sr_bits);
1853 if (status < 0) {
1854 ocfs2_rollback_alloc_dinode_counts(alloc_inode,
1855 ac->ac_bh, res->sr_bits, chain);
1856 mlog_errno(status);
1857 goto bail;
1858 }
1859
1860 trace_ocfs2_search_chain_end(
1861 (unsigned long long)le64_to_cpu(fe->i_blkno),
1862 res->sr_bits);
1863
1864out_loc_only:
1865 *bits_left = le16_to_cpu(bg->bg_free_bits_count);
1866bail:
1867 brelse(group_bh);
1868 brelse(prev_group_bh);
1869
1870 if (status)
1871 mlog_errno(status);
1872 return status;
1873}
1874
1875/* will give out up to bits_wanted contiguous bits. */
1876static int ocfs2_claim_suballoc_bits(struct ocfs2_alloc_context *ac,
1877 handle_t *handle,
1878 u32 bits_wanted,
1879 u32 min_bits,
1880 struct ocfs2_suballoc_result *res)
1881{
1882 int status;
1883 u16 victim, i;
1884 u16 bits_left = 0;
1885 u64 hint = ac->ac_last_group;
1886 struct ocfs2_chain_list *cl;
1887 struct ocfs2_dinode *fe;
1888
1889 BUG_ON(ac->ac_bits_given >= ac->ac_bits_wanted);
1890 BUG_ON(bits_wanted > (ac->ac_bits_wanted - ac->ac_bits_given));
1891 BUG_ON(!ac->ac_bh);
1892
1893 fe = (struct ocfs2_dinode *) ac->ac_bh->b_data;
1894
1895 /* The bh was validated by the inode read during
1896 * ocfs2_reserve_suballoc_bits(). Any corruption is a code bug. */
1897 BUG_ON(!OCFS2_IS_VALID_DINODE(fe));
1898
1899 if (le32_to_cpu(fe->id1.bitmap1.i_used) >=
1900 le32_to_cpu(fe->id1.bitmap1.i_total)) {
1901 status = ocfs2_error(ac->ac_inode->i_sb,
1902 "Chain allocator dinode %llu has %u used bits but only %u total\n",
1903 (unsigned long long)le64_to_cpu(fe->i_blkno),
1904 le32_to_cpu(fe->id1.bitmap1.i_used),
1905 le32_to_cpu(fe->id1.bitmap1.i_total));
1906 goto bail;
1907 }
1908
1909 res->sr_bg_blkno = hint;
1910 if (res->sr_bg_blkno) {
1911 /* Attempt to short-circuit the usual search mechanism
1912 * by jumping straight to the most recently used
1913 * allocation group. This helps us maintain some
1914 * contiguousness across allocations. */
1915 status = ocfs2_search_one_group(ac, handle, bits_wanted,
1916 min_bits, res, &bits_left);
1917 if (!status)
1918 goto set_hint;
1919 if (status < 0 && status != -ENOSPC) {
1920 mlog_errno(status);
1921 goto bail;
1922 }
1923 }
1924
1925 cl = (struct ocfs2_chain_list *) &fe->id2.i_chain;
1926
1927 victim = ocfs2_find_victim_chain(cl);
1928 ac->ac_chain = victim;
1929
1930 status = ocfs2_search_chain(ac, handle, bits_wanted, min_bits,
1931 res, &bits_left);
1932 if (!status) {
1933 if (ocfs2_is_cluster_bitmap(ac->ac_inode))
1934 hint = res->sr_bg_blkno;
1935 else
1936 hint = ocfs2_group_from_res(res);
1937 goto set_hint;
1938 }
1939 if (status < 0 && status != -ENOSPC) {
1940 mlog_errno(status);
1941 goto bail;
1942 }
1943
1944 trace_ocfs2_claim_suballoc_bits(victim);
1945
1946 /* If we didn't pick a good victim, then just default to
1947 * searching each chain in order. Don't allow chain relinking
1948 * because we only calculate enough journal credits for one
1949 * relink per alloc. */
1950 ac->ac_disable_chain_relink = 1;
1951 for (i = 0; i < le16_to_cpu(cl->cl_next_free_rec); i ++) {
1952 if (i == victim)
1953 continue;
1954 if (!cl->cl_recs[i].c_free)
1955 continue;
1956
1957 ac->ac_chain = i;
1958 status = ocfs2_search_chain(ac, handle, bits_wanted, min_bits,
1959 res, &bits_left);
1960 if (!status) {
1961 hint = ocfs2_group_from_res(res);
1962 break;
1963 }
1964 if (status < 0 && status != -ENOSPC) {
1965 mlog_errno(status);
1966 goto bail;
1967 }
1968 }
1969
1970set_hint:
1971 if (status != -ENOSPC) {
1972 /* If the next search of this group is not likely to
1973 * yield a suitable extent, then we reset the last
1974 * group hint so as to not waste a disk read */
1975 if (bits_left < min_bits)
1976 ac->ac_last_group = 0;
1977 else
1978 ac->ac_last_group = hint;
1979 }
1980
1981bail:
1982 if (status)
1983 mlog_errno(status);
1984 return status;
1985}
1986
1987int ocfs2_claim_metadata(handle_t *handle,
1988 struct ocfs2_alloc_context *ac,
1989 u32 bits_wanted,
1990 u64 *suballoc_loc,
1991 u16 *suballoc_bit_start,
1992 unsigned int *num_bits,
1993 u64 *blkno_start)
1994{
1995 int status;
1996 struct ocfs2_suballoc_result res = { .sr_blkno = 0, };
1997
1998 BUG_ON(!ac);
1999 BUG_ON(ac->ac_bits_wanted < (ac->ac_bits_given + bits_wanted));
2000 BUG_ON(ac->ac_which != OCFS2_AC_USE_META);
2001
2002 status = ocfs2_claim_suballoc_bits(ac,
2003 handle,
2004 bits_wanted,
2005 1,
2006 &res);
2007 if (status < 0) {
2008 mlog_errno(status);
2009 goto bail;
2010 }
2011 atomic_inc(&OCFS2_SB(ac->ac_inode->i_sb)->alloc_stats.bg_allocs);
2012
2013 *suballoc_loc = res.sr_bg_blkno;
2014 *suballoc_bit_start = res.sr_bit_offset;
2015 *blkno_start = res.sr_blkno;
2016 ac->ac_bits_given += res.sr_bits;
2017 *num_bits = res.sr_bits;
2018 status = 0;
2019bail:
2020 if (status)
2021 mlog_errno(status);
2022 return status;
2023}
2024
2025static void ocfs2_init_inode_ac_group(struct inode *dir,
2026 struct buffer_head *parent_di_bh,
2027 struct ocfs2_alloc_context *ac)
2028{
2029 struct ocfs2_dinode *di = (struct ocfs2_dinode *)parent_di_bh->b_data;
2030 /*
2031 * Try to allocate inodes from some specific group.
2032 *
2033 * If the parent dir has recorded the last group used in allocation,
2034 * cool, use it. Otherwise if we try to allocate new inode from the
2035 * same slot the parent dir belongs to, use the same chunk.
2036 *
2037 * We are very careful here to avoid the mistake of setting
2038 * ac_last_group to a group descriptor from a different (unlocked) slot.
2039 */
2040 if (OCFS2_I(dir)->ip_last_used_group &&
2041 OCFS2_I(dir)->ip_last_used_slot == ac->ac_alloc_slot)
2042 ac->ac_last_group = OCFS2_I(dir)->ip_last_used_group;
2043 else if (le16_to_cpu(di->i_suballoc_slot) == ac->ac_alloc_slot) {
2044 if (di->i_suballoc_loc)
2045 ac->ac_last_group = le64_to_cpu(di->i_suballoc_loc);
2046 else
2047 ac->ac_last_group = ocfs2_which_suballoc_group(
2048 le64_to_cpu(di->i_blkno),
2049 le16_to_cpu(di->i_suballoc_bit));
2050 }
2051}
2052
2053static inline void ocfs2_save_inode_ac_group(struct inode *dir,
2054 struct ocfs2_alloc_context *ac)
2055{
2056 OCFS2_I(dir)->ip_last_used_group = ac->ac_last_group;
2057 OCFS2_I(dir)->ip_last_used_slot = ac->ac_alloc_slot;
2058}
2059
2060int ocfs2_find_new_inode_loc(struct inode *dir,
2061 struct buffer_head *parent_fe_bh,
2062 struct ocfs2_alloc_context *ac,
2063 u64 *fe_blkno)
2064{
2065 int ret;
2066 handle_t *handle = NULL;
2067 struct ocfs2_suballoc_result *res;
2068
2069 BUG_ON(!ac);
2070 BUG_ON(ac->ac_bits_given != 0);
2071 BUG_ON(ac->ac_bits_wanted != 1);
2072 BUG_ON(ac->ac_which != OCFS2_AC_USE_INODE);
2073
2074 res = kzalloc(sizeof(*res), GFP_NOFS);
2075 if (res == NULL) {
2076 ret = -ENOMEM;
2077 mlog_errno(ret);
2078 goto out;
2079 }
2080
2081 ocfs2_init_inode_ac_group(dir, parent_fe_bh, ac);
2082
2083 /*
2084 * The handle started here is for chain relink. Alternatively,
2085 * we could just disable relink for these calls.
2086 */
2087 handle = ocfs2_start_trans(OCFS2_SB(dir->i_sb), OCFS2_SUBALLOC_ALLOC);
2088 if (IS_ERR(handle)) {
2089 ret = PTR_ERR(handle);
2090 handle = NULL;
2091 mlog_errno(ret);
2092 goto out;
2093 }
2094
2095 /*
2096 * This will instruct ocfs2_claim_suballoc_bits and
2097 * ocfs2_search_one_group to search but save actual allocation
2098 * for later.
2099 */
2100 ac->ac_find_loc_only = 1;
2101
2102 ret = ocfs2_claim_suballoc_bits(ac, handle, 1, 1, res);
2103 if (ret < 0) {
2104 mlog_errno(ret);
2105 goto out;
2106 }
2107
2108 ac->ac_find_loc_priv = res;
2109 *fe_blkno = res->sr_blkno;
2110 ocfs2_update_inode_fsync_trans(handle, dir, 0);
2111out:
2112 if (handle)
2113 ocfs2_commit_trans(OCFS2_SB(dir->i_sb), handle);
2114
2115 if (ret)
2116 kfree(res);
2117
2118 return ret;
2119}
2120
2121int ocfs2_claim_new_inode_at_loc(handle_t *handle,
2122 struct inode *dir,
2123 struct ocfs2_alloc_context *ac,
2124 u64 *suballoc_loc,
2125 u16 *suballoc_bit,
2126 u64 di_blkno)
2127{
2128 int ret;
2129 u16 chain;
2130 struct ocfs2_suballoc_result *res = ac->ac_find_loc_priv;
2131 struct buffer_head *bg_bh = NULL;
2132 struct ocfs2_group_desc *bg;
2133 struct ocfs2_dinode *di = (struct ocfs2_dinode *) ac->ac_bh->b_data;
2134
2135 /*
2136 * Since di_blkno is being passed back in, we check for any
2137 * inconsistencies which may have happened between
2138 * calls. These are code bugs as di_blkno is not expected to
2139 * change once returned from ocfs2_find_new_inode_loc()
2140 */
2141 BUG_ON(res->sr_blkno != di_blkno);
2142
2143 ret = ocfs2_read_group_descriptor(ac->ac_inode, di,
2144 res->sr_bg_stable_blkno, &bg_bh);
2145 if (ret) {
2146 mlog_errno(ret);
2147 goto out;
2148 }
2149
2150 bg = (struct ocfs2_group_desc *) bg_bh->b_data;
2151 chain = le16_to_cpu(bg->bg_chain);
2152
2153 ret = ocfs2_alloc_dinode_update_counts(ac->ac_inode, handle,
2154 ac->ac_bh, res->sr_bits,
2155 chain);
2156 if (ret) {
2157 mlog_errno(ret);
2158 goto out;
2159 }
2160
2161 ret = ocfs2_block_group_set_bits(handle,
2162 ac->ac_inode,
2163 bg,
2164 bg_bh,
2165 res->sr_bit_offset,
2166 res->sr_bits);
2167 if (ret < 0) {
2168 ocfs2_rollback_alloc_dinode_counts(ac->ac_inode,
2169 ac->ac_bh, res->sr_bits, chain);
2170 mlog_errno(ret);
2171 goto out;
2172 }
2173
2174 trace_ocfs2_claim_new_inode_at_loc((unsigned long long)di_blkno,
2175 res->sr_bits);
2176
2177 atomic_inc(&OCFS2_SB(ac->ac_inode->i_sb)->alloc_stats.bg_allocs);
2178
2179 BUG_ON(res->sr_bits != 1);
2180
2181 *suballoc_loc = res->sr_bg_blkno;
2182 *suballoc_bit = res->sr_bit_offset;
2183 ac->ac_bits_given++;
2184 ocfs2_save_inode_ac_group(dir, ac);
2185
2186out:
2187 brelse(bg_bh);
2188
2189 return ret;
2190}
2191
2192int ocfs2_claim_new_inode(handle_t *handle,
2193 struct inode *dir,
2194 struct buffer_head *parent_fe_bh,
2195 struct ocfs2_alloc_context *ac,
2196 u64 *suballoc_loc,
2197 u16 *suballoc_bit,
2198 u64 *fe_blkno)
2199{
2200 int status;
2201 struct ocfs2_suballoc_result res;
2202
2203 BUG_ON(!ac);
2204 BUG_ON(ac->ac_bits_given != 0);
2205 BUG_ON(ac->ac_bits_wanted != 1);
2206 BUG_ON(ac->ac_which != OCFS2_AC_USE_INODE);
2207
2208 ocfs2_init_inode_ac_group(dir, parent_fe_bh, ac);
2209
2210 status = ocfs2_claim_suballoc_bits(ac,
2211 handle,
2212 1,
2213 1,
2214 &res);
2215 if (status < 0) {
2216 mlog_errno(status);
2217 goto bail;
2218 }
2219 atomic_inc(&OCFS2_SB(ac->ac_inode->i_sb)->alloc_stats.bg_allocs);
2220
2221 BUG_ON(res.sr_bits != 1);
2222
2223 *suballoc_loc = res.sr_bg_blkno;
2224 *suballoc_bit = res.sr_bit_offset;
2225 *fe_blkno = res.sr_blkno;
2226 ac->ac_bits_given++;
2227 ocfs2_save_inode_ac_group(dir, ac);
2228 status = 0;
2229bail:
2230 if (status)
2231 mlog_errno(status);
2232 return status;
2233}
2234
2235/* translate a group desc. blkno and it's bitmap offset into
2236 * disk cluster offset. */
2237static inline u32 ocfs2_desc_bitmap_to_cluster_off(struct inode *inode,
2238 u64 bg_blkno,
2239 u16 bg_bit_off)
2240{
2241 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2242 u32 cluster = 0;
2243
2244 BUG_ON(!ocfs2_is_cluster_bitmap(inode));
2245
2246 if (bg_blkno != osb->first_cluster_group_blkno)
2247 cluster = ocfs2_blocks_to_clusters(inode->i_sb, bg_blkno);
2248 cluster += (u32) bg_bit_off;
2249 return cluster;
2250}
2251
2252/* given a cluster offset, calculate which block group it belongs to
2253 * and return that block offset. */
2254u64 ocfs2_which_cluster_group(struct inode *inode, u32 cluster)
2255{
2256 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2257 u32 group_no;
2258
2259 BUG_ON(!ocfs2_is_cluster_bitmap(inode));
2260
2261 group_no = cluster / osb->bitmap_cpg;
2262 if (!group_no)
2263 return osb->first_cluster_group_blkno;
2264 return ocfs2_clusters_to_blocks(inode->i_sb,
2265 group_no * osb->bitmap_cpg);
2266}
2267
2268/* given the block number of a cluster start, calculate which cluster
2269 * group and descriptor bitmap offset that corresponds to. */
2270static inline void ocfs2_block_to_cluster_group(struct inode *inode,
2271 u64 data_blkno,
2272 u64 *bg_blkno,
2273 u16 *bg_bit_off)
2274{
2275 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2276 u32 data_cluster = ocfs2_blocks_to_clusters(osb->sb, data_blkno);
2277
2278 BUG_ON(!ocfs2_is_cluster_bitmap(inode));
2279
2280 *bg_blkno = ocfs2_which_cluster_group(inode,
2281 data_cluster);
2282
2283 if (*bg_blkno == osb->first_cluster_group_blkno)
2284 *bg_bit_off = (u16) data_cluster;
2285 else
2286 *bg_bit_off = (u16) ocfs2_blocks_to_clusters(osb->sb,
2287 data_blkno - *bg_blkno);
2288}
2289
2290/*
2291 * min_bits - minimum contiguous chunk from this total allocation we
2292 * can handle. set to what we asked for originally for a full
2293 * contig. allocation, set to '1' to indicate we can deal with extents
2294 * of any size.
2295 */
2296int __ocfs2_claim_clusters(handle_t *handle,
2297 struct ocfs2_alloc_context *ac,
2298 u32 min_clusters,
2299 u32 max_clusters,
2300 u32 *cluster_start,
2301 u32 *num_clusters)
2302{
2303 int status;
2304 unsigned int bits_wanted = max_clusters;
2305 struct ocfs2_suballoc_result res = { .sr_blkno = 0, };
2306 struct ocfs2_super *osb = OCFS2_SB(ac->ac_inode->i_sb);
2307
2308 BUG_ON(ac->ac_bits_given >= ac->ac_bits_wanted);
2309
2310 BUG_ON(ac->ac_which != OCFS2_AC_USE_LOCAL
2311 && ac->ac_which != OCFS2_AC_USE_MAIN);
2312
2313 if (ac->ac_which == OCFS2_AC_USE_LOCAL) {
2314 WARN_ON(min_clusters > 1);
2315
2316 status = ocfs2_claim_local_alloc_bits(osb,
2317 handle,
2318 ac,
2319 bits_wanted,
2320 cluster_start,
2321 num_clusters);
2322 if (!status)
2323 atomic_inc(&osb->alloc_stats.local_data);
2324 } else {
2325 if (min_clusters > (osb->bitmap_cpg - 1)) {
2326 /* The only paths asking for contiguousness
2327 * should know about this already. */
2328 mlog(ML_ERROR, "minimum allocation requested %u exceeds "
2329 "group bitmap size %u!\n", min_clusters,
2330 osb->bitmap_cpg);
2331 status = -ENOSPC;
2332 goto bail;
2333 }
2334 /* clamp the current request down to a realistic size. */
2335 if (bits_wanted > (osb->bitmap_cpg - 1))
2336 bits_wanted = osb->bitmap_cpg - 1;
2337
2338 status = ocfs2_claim_suballoc_bits(ac,
2339 handle,
2340 bits_wanted,
2341 min_clusters,
2342 &res);
2343 if (!status) {
2344 BUG_ON(res.sr_blkno); /* cluster alloc can't set */
2345 *cluster_start =
2346 ocfs2_desc_bitmap_to_cluster_off(ac->ac_inode,
2347 res.sr_bg_blkno,
2348 res.sr_bit_offset);
2349 atomic_inc(&osb->alloc_stats.bitmap_data);
2350 *num_clusters = res.sr_bits;
2351 }
2352 }
2353 if (status < 0) {
2354 if (status != -ENOSPC)
2355 mlog_errno(status);
2356 goto bail;
2357 }
2358
2359 ac->ac_bits_given += *num_clusters;
2360
2361bail:
2362 if (status)
2363 mlog_errno(status);
2364 return status;
2365}
2366
2367int ocfs2_claim_clusters(handle_t *handle,
2368 struct ocfs2_alloc_context *ac,
2369 u32 min_clusters,
2370 u32 *cluster_start,
2371 u32 *num_clusters)
2372{
2373 unsigned int bits_wanted = ac->ac_bits_wanted - ac->ac_bits_given;
2374
2375 return __ocfs2_claim_clusters(handle, ac, min_clusters,
2376 bits_wanted, cluster_start, num_clusters);
2377}
2378
2379static int ocfs2_block_group_clear_bits(handle_t *handle,
2380 struct inode *alloc_inode,
2381 struct ocfs2_group_desc *bg,
2382 struct buffer_head *group_bh,
2383 unsigned int bit_off,
2384 unsigned int num_bits,
2385 void (*undo_fn)(unsigned int bit,
2386 unsigned long *bmap))
2387{
2388 int status;
2389 unsigned int tmp;
2390 struct ocfs2_group_desc *undo_bg = NULL;
2391 struct journal_head *jh;
2392
2393 /* The caller got this descriptor from
2394 * ocfs2_read_group_descriptor(). Any corruption is a code bug. */
2395 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
2396
2397 trace_ocfs2_block_group_clear_bits(bit_off, num_bits);
2398
2399 BUG_ON(undo_fn && !ocfs2_is_cluster_bitmap(alloc_inode));
2400 status = ocfs2_journal_access_gd(handle, INODE_CACHE(alloc_inode),
2401 group_bh,
2402 undo_fn ?
2403 OCFS2_JOURNAL_ACCESS_UNDO :
2404 OCFS2_JOURNAL_ACCESS_WRITE);
2405 if (status < 0) {
2406 mlog_errno(status);
2407 goto bail;
2408 }
2409
2410 jh = bh2jh(group_bh);
2411 if (undo_fn) {
2412 spin_lock(&jh->b_state_lock);
2413 undo_bg = (struct ocfs2_group_desc *) jh->b_committed_data;
2414 BUG_ON(!undo_bg);
2415 }
2416
2417 tmp = num_bits;
2418 while(tmp--) {
2419 ocfs2_clear_bit((bit_off + tmp),
2420 (unsigned long *) bg->bg_bitmap);
2421 if (undo_fn)
2422 undo_fn(bit_off + tmp,
2423 (unsigned long *) undo_bg->bg_bitmap);
2424 }
2425 le16_add_cpu(&bg->bg_free_bits_count, num_bits);
2426 if (le16_to_cpu(bg->bg_free_bits_count) > le16_to_cpu(bg->bg_bits)) {
2427 if (undo_fn)
2428 spin_unlock(&jh->b_state_lock);
2429 return ocfs2_error(alloc_inode->i_sb, "Group descriptor # %llu has bit count %u but claims %u are freed. num_bits %d\n",
2430 (unsigned long long)le64_to_cpu(bg->bg_blkno),
2431 le16_to_cpu(bg->bg_bits),
2432 le16_to_cpu(bg->bg_free_bits_count),
2433 num_bits);
2434 }
2435
2436 if (undo_fn)
2437 spin_unlock(&jh->b_state_lock);
2438
2439 ocfs2_journal_dirty(handle, group_bh);
2440bail:
2441 return status;
2442}
2443
2444/*
2445 * expects the suballoc inode to already be locked.
2446 */
2447static int _ocfs2_free_suballoc_bits(handle_t *handle,
2448 struct inode *alloc_inode,
2449 struct buffer_head *alloc_bh,
2450 unsigned int start_bit,
2451 u64 bg_blkno,
2452 unsigned int count,
2453 void (*undo_fn)(unsigned int bit,
2454 unsigned long *bitmap))
2455{
2456 int status = 0;
2457 u32 tmp_used;
2458 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) alloc_bh->b_data;
2459 struct ocfs2_chain_list *cl = &fe->id2.i_chain;
2460 struct buffer_head *group_bh = NULL;
2461 struct ocfs2_group_desc *group;
2462
2463 /* The alloc_bh comes from ocfs2_free_dinode() or
2464 * ocfs2_free_clusters(). The callers have all locked the
2465 * allocator and gotten alloc_bh from the lock call. This
2466 * validates the dinode buffer. Any corruption that has happened
2467 * is a code bug. */
2468 BUG_ON(!OCFS2_IS_VALID_DINODE(fe));
2469 BUG_ON((count + start_bit) > ocfs2_bits_per_group(cl));
2470
2471 trace_ocfs2_free_suballoc_bits(
2472 (unsigned long long)OCFS2_I(alloc_inode)->ip_blkno,
2473 (unsigned long long)bg_blkno,
2474 start_bit, count);
2475
2476 status = ocfs2_read_group_descriptor(alloc_inode, fe, bg_blkno,
2477 &group_bh);
2478 if (status < 0) {
2479 mlog_errno(status);
2480 goto bail;
2481 }
2482 group = (struct ocfs2_group_desc *) group_bh->b_data;
2483
2484 BUG_ON((count + start_bit) > le16_to_cpu(group->bg_bits));
2485
2486 status = ocfs2_block_group_clear_bits(handle, alloc_inode,
2487 group, group_bh,
2488 start_bit, count, undo_fn);
2489 if (status < 0) {
2490 mlog_errno(status);
2491 goto bail;
2492 }
2493
2494 status = ocfs2_journal_access_di(handle, INODE_CACHE(alloc_inode),
2495 alloc_bh, OCFS2_JOURNAL_ACCESS_WRITE);
2496 if (status < 0) {
2497 mlog_errno(status);
2498 ocfs2_block_group_set_bits(handle, alloc_inode, group, group_bh,
2499 start_bit, count);
2500 goto bail;
2501 }
2502
2503 le32_add_cpu(&cl->cl_recs[le16_to_cpu(group->bg_chain)].c_free,
2504 count);
2505 tmp_used = le32_to_cpu(fe->id1.bitmap1.i_used);
2506 fe->id1.bitmap1.i_used = cpu_to_le32(tmp_used - count);
2507 ocfs2_journal_dirty(handle, alloc_bh);
2508
2509bail:
2510 brelse(group_bh);
2511 return status;
2512}
2513
2514int ocfs2_free_suballoc_bits(handle_t *handle,
2515 struct inode *alloc_inode,
2516 struct buffer_head *alloc_bh,
2517 unsigned int start_bit,
2518 u64 bg_blkno,
2519 unsigned int count)
2520{
2521 return _ocfs2_free_suballoc_bits(handle, alloc_inode, alloc_bh,
2522 start_bit, bg_blkno, count, NULL);
2523}
2524
2525int ocfs2_free_dinode(handle_t *handle,
2526 struct inode *inode_alloc_inode,
2527 struct buffer_head *inode_alloc_bh,
2528 struct ocfs2_dinode *di)
2529{
2530 u64 blk = le64_to_cpu(di->i_blkno);
2531 u16 bit = le16_to_cpu(di->i_suballoc_bit);
2532 u64 bg_blkno = ocfs2_which_suballoc_group(blk, bit);
2533
2534 if (di->i_suballoc_loc)
2535 bg_blkno = le64_to_cpu(di->i_suballoc_loc);
2536 return ocfs2_free_suballoc_bits(handle, inode_alloc_inode,
2537 inode_alloc_bh, bit, bg_blkno, 1);
2538}
2539
2540static int _ocfs2_free_clusters(handle_t *handle,
2541 struct inode *bitmap_inode,
2542 struct buffer_head *bitmap_bh,
2543 u64 start_blk,
2544 unsigned int num_clusters,
2545 void (*undo_fn)(unsigned int bit,
2546 unsigned long *bitmap))
2547{
2548 int status;
2549 u16 bg_start_bit;
2550 u64 bg_blkno;
2551
2552 /* You can't ever have a contiguous set of clusters
2553 * bigger than a block group bitmap so we never have to worry
2554 * about looping on them.
2555 * This is expensive. We can safely remove once this stuff has
2556 * gotten tested really well. */
2557 BUG_ON(start_blk != ocfs2_clusters_to_blocks(bitmap_inode->i_sb,
2558 ocfs2_blocks_to_clusters(bitmap_inode->i_sb,
2559 start_blk)));
2560
2561
2562 ocfs2_block_to_cluster_group(bitmap_inode, start_blk, &bg_blkno,
2563 &bg_start_bit);
2564
2565 trace_ocfs2_free_clusters((unsigned long long)bg_blkno,
2566 (unsigned long long)start_blk,
2567 bg_start_bit, num_clusters);
2568
2569 status = _ocfs2_free_suballoc_bits(handle, bitmap_inode, bitmap_bh,
2570 bg_start_bit, bg_blkno,
2571 num_clusters, undo_fn);
2572 if (status < 0) {
2573 mlog_errno(status);
2574 goto out;
2575 }
2576
2577 ocfs2_local_alloc_seen_free_bits(OCFS2_SB(bitmap_inode->i_sb),
2578 num_clusters);
2579
2580out:
2581 return status;
2582}
2583
2584int ocfs2_free_clusters(handle_t *handle,
2585 struct inode *bitmap_inode,
2586 struct buffer_head *bitmap_bh,
2587 u64 start_blk,
2588 unsigned int num_clusters)
2589{
2590 return _ocfs2_free_clusters(handle, bitmap_inode, bitmap_bh,
2591 start_blk, num_clusters,
2592 _ocfs2_set_bit);
2593}
2594
2595/*
2596 * Give never-used clusters back to the global bitmap. We don't need
2597 * to protect these bits in the undo buffer.
2598 */
2599int ocfs2_release_clusters(handle_t *handle,
2600 struct inode *bitmap_inode,
2601 struct buffer_head *bitmap_bh,
2602 u64 start_blk,
2603 unsigned int num_clusters)
2604{
2605 return _ocfs2_free_clusters(handle, bitmap_inode, bitmap_bh,
2606 start_blk, num_clusters,
2607 _ocfs2_clear_bit);
2608}
2609
2610/*
2611 * For a given allocation, determine which allocators will need to be
2612 * accessed, and lock them, reserving the appropriate number of bits.
2613 *
2614 * Sparse file systems call this from ocfs2_write_begin_nolock()
2615 * and ocfs2_allocate_unwritten_extents().
2616 *
2617 * File systems which don't support holes call this from
2618 * ocfs2_extend_allocation().
2619 */
2620int ocfs2_lock_allocators(struct inode *inode,
2621 struct ocfs2_extent_tree *et,
2622 u32 clusters_to_add, u32 extents_to_split,
2623 struct ocfs2_alloc_context **data_ac,
2624 struct ocfs2_alloc_context **meta_ac)
2625{
2626 int ret = 0, num_free_extents;
2627 unsigned int max_recs_needed = clusters_to_add + 2 * extents_to_split;
2628 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2629
2630 *meta_ac = NULL;
2631 if (data_ac)
2632 *data_ac = NULL;
2633
2634 BUG_ON(clusters_to_add != 0 && data_ac == NULL);
2635
2636 num_free_extents = ocfs2_num_free_extents(et);
2637 if (num_free_extents < 0) {
2638 ret = num_free_extents;
2639 mlog_errno(ret);
2640 goto out;
2641 }
2642
2643 /*
2644 * Sparse allocation file systems need to be more conservative
2645 * with reserving room for expansion - the actual allocation
2646 * happens while we've got a journal handle open so re-taking
2647 * a cluster lock (because we ran out of room for another
2648 * extent) will violate ordering rules.
2649 *
2650 * Most of the time we'll only be seeing this 1 cluster at a time
2651 * anyway.
2652 *
2653 * Always lock for any unwritten extents - we might want to
2654 * add blocks during a split.
2655 */
2656 if (!num_free_extents ||
2657 (ocfs2_sparse_alloc(osb) && num_free_extents < max_recs_needed)) {
2658 ret = ocfs2_reserve_new_metadata(osb, et->et_root_el, meta_ac);
2659 if (ret < 0) {
2660 if (ret != -ENOSPC)
2661 mlog_errno(ret);
2662 goto out;
2663 }
2664 }
2665
2666 if (clusters_to_add == 0)
2667 goto out;
2668
2669 ret = ocfs2_reserve_clusters(osb, clusters_to_add, data_ac);
2670 if (ret < 0) {
2671 if (ret != -ENOSPC)
2672 mlog_errno(ret);
2673 goto out;
2674 }
2675
2676out:
2677 if (ret) {
2678 if (*meta_ac) {
2679 ocfs2_free_alloc_context(*meta_ac);
2680 *meta_ac = NULL;
2681 }
2682
2683 /*
2684 * We cannot have an error and a non null *data_ac.
2685 */
2686 }
2687
2688 return ret;
2689}
2690
2691/*
2692 * Read the inode specified by blkno to get suballoc_slot and
2693 * suballoc_bit.
2694 */
2695static int ocfs2_get_suballoc_slot_bit(struct ocfs2_super *osb, u64 blkno,
2696 u16 *suballoc_slot, u64 *group_blkno,
2697 u16 *suballoc_bit)
2698{
2699 int status;
2700 struct buffer_head *inode_bh = NULL;
2701 struct ocfs2_dinode *inode_fe;
2702
2703 trace_ocfs2_get_suballoc_slot_bit((unsigned long long)blkno);
2704
2705 /* dirty read disk */
2706 status = ocfs2_read_blocks_sync(osb, blkno, 1, &inode_bh);
2707 if (status < 0) {
2708 mlog(ML_ERROR, "read block %llu failed %d\n",
2709 (unsigned long long)blkno, status);
2710 goto bail;
2711 }
2712
2713 inode_fe = (struct ocfs2_dinode *) inode_bh->b_data;
2714 if (!OCFS2_IS_VALID_DINODE(inode_fe)) {
2715 mlog(ML_ERROR, "invalid inode %llu requested\n",
2716 (unsigned long long)blkno);
2717 status = -EINVAL;
2718 goto bail;
2719 }
2720
2721 if (le16_to_cpu(inode_fe->i_suballoc_slot) != (u16)OCFS2_INVALID_SLOT &&
2722 (u32)le16_to_cpu(inode_fe->i_suballoc_slot) > osb->max_slots - 1) {
2723 mlog(ML_ERROR, "inode %llu has invalid suballoc slot %u\n",
2724 (unsigned long long)blkno,
2725 (u32)le16_to_cpu(inode_fe->i_suballoc_slot));
2726 status = -EINVAL;
2727 goto bail;
2728 }
2729
2730 if (suballoc_slot)
2731 *suballoc_slot = le16_to_cpu(inode_fe->i_suballoc_slot);
2732 if (suballoc_bit)
2733 *suballoc_bit = le16_to_cpu(inode_fe->i_suballoc_bit);
2734 if (group_blkno)
2735 *group_blkno = le64_to_cpu(inode_fe->i_suballoc_loc);
2736
2737bail:
2738 brelse(inode_bh);
2739
2740 if (status)
2741 mlog_errno(status);
2742 return status;
2743}
2744
2745/*
2746 * test whether bit is SET in allocator bitmap or not. on success, 0
2747 * is returned and *res is 1 for SET; 0 otherwise. when fails, errno
2748 * is returned and *res is meaningless. Call this after you have
2749 * cluster locked against suballoc, or you may get a result based on
2750 * non-up2date contents
2751 */
2752static int ocfs2_test_suballoc_bit(struct ocfs2_super *osb,
2753 struct inode *suballoc,
2754 struct buffer_head *alloc_bh,
2755 u64 group_blkno, u64 blkno,
2756 u16 bit, int *res)
2757{
2758 struct ocfs2_dinode *alloc_di;
2759 struct ocfs2_group_desc *group;
2760 struct buffer_head *group_bh = NULL;
2761 u64 bg_blkno;
2762 int status;
2763
2764 trace_ocfs2_test_suballoc_bit((unsigned long long)blkno,
2765 (unsigned int)bit);
2766
2767 alloc_di = (struct ocfs2_dinode *)alloc_bh->b_data;
2768 if ((bit + 1) > ocfs2_bits_per_group(&alloc_di->id2.i_chain)) {
2769 mlog(ML_ERROR, "suballoc bit %u out of range of %u\n",
2770 (unsigned int)bit,
2771 ocfs2_bits_per_group(&alloc_di->id2.i_chain));
2772 status = -EINVAL;
2773 goto bail;
2774 }
2775
2776 bg_blkno = group_blkno ? group_blkno :
2777 ocfs2_which_suballoc_group(blkno, bit);
2778 status = ocfs2_read_group_descriptor(suballoc, alloc_di, bg_blkno,
2779 &group_bh);
2780 if (status < 0) {
2781 mlog(ML_ERROR, "read group %llu failed %d\n",
2782 (unsigned long long)bg_blkno, status);
2783 goto bail;
2784 }
2785
2786 group = (struct ocfs2_group_desc *) group_bh->b_data;
2787 *res = ocfs2_test_bit(bit, (unsigned long *)group->bg_bitmap);
2788
2789bail:
2790 brelse(group_bh);
2791
2792 if (status)
2793 mlog_errno(status);
2794 return status;
2795}
2796
2797/*
2798 * Test if the bit representing this inode (blkno) is set in the
2799 * suballocator.
2800 *
2801 * On success, 0 is returned and *res is 1 for SET; 0 otherwise.
2802 *
2803 * In the event of failure, a negative value is returned and *res is
2804 * meaningless.
2805 *
2806 * Callers must make sure to hold nfs_sync_lock to prevent
2807 * ocfs2_delete_inode() on another node from accessing the same
2808 * suballocator concurrently.
2809 */
2810int ocfs2_test_inode_bit(struct ocfs2_super *osb, u64 blkno, int *res)
2811{
2812 int status;
2813 u64 group_blkno = 0;
2814 u16 suballoc_bit = 0, suballoc_slot = 0;
2815 struct inode *inode_alloc_inode;
2816 struct buffer_head *alloc_bh = NULL;
2817
2818 trace_ocfs2_test_inode_bit((unsigned long long)blkno);
2819
2820 status = ocfs2_get_suballoc_slot_bit(osb, blkno, &suballoc_slot,
2821 &group_blkno, &suballoc_bit);
2822 if (status < 0) {
2823 mlog(ML_ERROR, "get alloc slot and bit failed %d\n", status);
2824 goto bail;
2825 }
2826
2827 if (suballoc_slot == (u16)OCFS2_INVALID_SLOT)
2828 inode_alloc_inode = ocfs2_get_system_file_inode(osb,
2829 GLOBAL_INODE_ALLOC_SYSTEM_INODE, suballoc_slot);
2830 else
2831 inode_alloc_inode = ocfs2_get_system_file_inode(osb,
2832 INODE_ALLOC_SYSTEM_INODE, suballoc_slot);
2833 if (!inode_alloc_inode) {
2834 /* the error code could be inaccurate, but we are not able to
2835 * get the correct one. */
2836 status = -EINVAL;
2837 mlog(ML_ERROR, "unable to get alloc inode in slot %u\n",
2838 (u32)suballoc_slot);
2839 goto bail;
2840 }
2841
2842 inode_lock(inode_alloc_inode);
2843 status = ocfs2_inode_lock(inode_alloc_inode, &alloc_bh, 0);
2844 if (status < 0) {
2845 inode_unlock(inode_alloc_inode);
2846 iput(inode_alloc_inode);
2847 mlog(ML_ERROR, "lock on alloc inode on slot %u failed %d\n",
2848 (u32)suballoc_slot, status);
2849 goto bail;
2850 }
2851
2852 status = ocfs2_test_suballoc_bit(osb, inode_alloc_inode, alloc_bh,
2853 group_blkno, blkno, suballoc_bit, res);
2854 if (status < 0)
2855 mlog(ML_ERROR, "test suballoc bit failed %d\n", status);
2856
2857 ocfs2_inode_unlock(inode_alloc_inode, 0);
2858 inode_unlock(inode_alloc_inode);
2859
2860 iput(inode_alloc_inode);
2861 brelse(alloc_bh);
2862bail:
2863 if (status)
2864 mlog_errno(status);
2865 return status;
2866}