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WIP FPC-III support
[linux/fpc-iii.git] / fs / ocfs2 / suballoc.c
blob8c8cf7f4eb34e50a0203f833c72f81c077a52015
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
42 struct 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
57 static 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
68 static inline u16 ocfs2_find_victim_chain(struct ocfs2_chain_list *cl);
69 static 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);
76 static 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
83 static 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);
88 static 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);
93 static 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);
98 static int ocfs2_test_bg_bit_allocatable(struct buffer_head *bg_bh,
99 int nr);
100 static 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);
106 static inline int ocfs2_block_group_reasonably_empty(struct ocfs2_group_desc *bg,
107 u32 wanted);
108 static inline u32 ocfs2_desc_bitmap_to_cluster_off(struct inode *inode,
109 u64 bg_blkno,
110 u16 bg_bit_off);
111 static inline void ocfs2_block_to_cluster_group(struct inode *inode,
112 u64 data_blkno,
113 u64 *bg_blkno,
114 u16 *bg_bit_off);
115 static 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
120 void 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
140 void ocfs2_free_alloc_context(struct ocfs2_alloc_context *ac)
141 {
142 ocfs2_free_ac_resource(ac);
143 kfree(ac);
144 }
145
146 static 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, ...) \
152 do { \
153 if (resize) \
154 mlog(ML_ERROR, fmt, ##__VA_ARGS__); \
155 else \
156 return ocfs2_error(sb, fmt, ##__VA_ARGS__); \
157 } while (0)
158
159 static 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
200 static 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 */
241 int 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
268 static 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
295 int 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
316 out:
317 return rc;
318 }
319
320 static 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
342 static 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
398 bail:
399 if (status)
400 mlog_errno(status);
401 return status;
402 }
403
404 static 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
418 static struct buffer_head *
419 ocfs2_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
459 bail:
460 return status ? ERR_PTR(status) : bg_bh;
461 }
462
463 static 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
483 static 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
541 bail:
542 return status;
543 }
544
545 static 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
575 static struct buffer_head *
576 ocfs2_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
644 bail:
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 */
653 static 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 (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
750 bail:
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
764 static 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;
848 bail:
849 brelse(bh);
850
851 if (status)
852 mlog_errno(status);
853 return status;
854 }
855
856 static 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
864 static 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
872 void 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
878 static 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 = (u16)slot;
883 else if (type == EXTENT_ALLOC_SYSTEM_INODE)
884 osb->s_meta_steal_slot = (u16)slot;
885 spin_unlock(&osb->osb_lock);
886 }
887
888 static 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
902 static int ocfs2_get_inode_steal_slot(struct ocfs2_super *osb)
903 {
904 return __ocfs2_get_steal_slot(osb, INODE_ALLOC_SYSTEM_INODE);
905 }
906
907 static int ocfs2_get_meta_steal_slot(struct ocfs2_super *osb)
908 {
909 return __ocfs2_get_steal_slot(osb, EXTENT_ALLOC_SYSTEM_INODE);
910 }
911
912 static 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
945 static 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
951 static 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
957 int 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
998 extent_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;
1008 bail:
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
1019 int 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
1028 int 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
1099 inode_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;
1109 bail:
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.. */
1122 int 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. */
1143 static 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) {
1174 retry:
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;
1210 bail:
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
1221 int 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 */
1251 static 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 struct journal_head *jh;
1256 int ret;
1257
1258 if (ocfs2_test_bit(nr, (unsigned long *)bg->bg_bitmap))
1259 return 0;
1260
1261 if (!buffer_jbd(bg_bh))
1262 return 1;
1263
1264 jh = bh2jh(bg_bh);
1265 spin_lock(&jh->b_state_lock);
1266 bg = (struct ocfs2_group_desc *) jh->b_committed_data;
1267 if (bg)
1268 ret = !ocfs2_test_bit(nr, (unsigned long *)bg->bg_bitmap);
1269 else
1270 ret = 1;
1271 spin_unlock(&jh->b_state_lock);
1272
1273 return ret;
1274 }
1275
1276 static int ocfs2_block_group_find_clear_bits(struct ocfs2_super *osb,
1277 struct buffer_head *bg_bh,
1278 unsigned int bits_wanted,
1279 unsigned int total_bits,
1280 struct ocfs2_suballoc_result *res)
1281 {
1282 void *bitmap;
1283 u16 best_offset, best_size;
1284 int offset, start, found, status = 0;
1285 struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data;
1286
1287 /* Callers got this descriptor from
1288 * ocfs2_read_group_descriptor(). Any corruption is a code bug. */
1289 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
1290
1291 found = start = best_offset = best_size = 0;
1292 bitmap = bg->bg_bitmap;
1293
1294 while((offset = ocfs2_find_next_zero_bit(bitmap, total_bits, start)) != -1) {
1295 if (offset == total_bits)
1296 break;
1297
1298 if (!ocfs2_test_bg_bit_allocatable(bg_bh, offset)) {
1299 /* We found a zero, but we can't use it as it
1300 * hasn't been put to disk yet! */
1301 found = 0;
1302 start = offset + 1;
1303 } else if (offset == start) {
1304 /* we found a zero */
1305 found++;
1306 /* move start to the next bit to test */
1307 start++;
1308 } else {
1309 /* got a zero after some ones */
1310 found = 1;
1311 start = offset + 1;
1312 }
1313 if (found > best_size) {
1314 best_size = found;
1315 best_offset = start - found;
1316 }
1317 /* we got everything we needed */
1318 if (found == bits_wanted) {
1319 /* mlog(0, "Found it all!\n"); */
1320 break;
1321 }
1322 }
1323
1324 if (best_size) {
1325 res->sr_bit_offset = best_offset;
1326 res->sr_bits = best_size;
1327 } else {
1328 status = -ENOSPC;
1329 /* No error log here -- see the comment above
1330 * ocfs2_test_bg_bit_allocatable */
1331 }
1332
1333 return status;
1334 }
1335
1336 int ocfs2_block_group_set_bits(handle_t *handle,
1337 struct inode *alloc_inode,
1338 struct ocfs2_group_desc *bg,
1339 struct buffer_head *group_bh,
1340 unsigned int bit_off,
1341 unsigned int num_bits)
1342 {
1343 int status;
1344 void *bitmap = bg->bg_bitmap;
1345 int journal_type = OCFS2_JOURNAL_ACCESS_WRITE;
1346
1347 /* All callers get the descriptor via
1348 * ocfs2_read_group_descriptor(). Any corruption is a code bug. */
1349 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
1350 BUG_ON(le16_to_cpu(bg->bg_free_bits_count) < num_bits);
1351
1352 trace_ocfs2_block_group_set_bits(bit_off, num_bits);
1353
1354 if (ocfs2_is_cluster_bitmap(alloc_inode))
1355 journal_type = OCFS2_JOURNAL_ACCESS_UNDO;
1356
1357 status = ocfs2_journal_access_gd(handle,
1358 INODE_CACHE(alloc_inode),
1359 group_bh,
1360 journal_type);
1361 if (status < 0) {
1362 mlog_errno(status);
1363 goto bail;
1364 }
1365
1366 le16_add_cpu(&bg->bg_free_bits_count, -num_bits);
1367 if (le16_to_cpu(bg->bg_free_bits_count) > le16_to_cpu(bg->bg_bits)) {
1368 return ocfs2_error(alloc_inode->i_sb, "Group descriptor # %llu has bit count %u but claims %u are freed. num_bits %d\n",
1369 (unsigned long long)le64_to_cpu(bg->bg_blkno),
1370 le16_to_cpu(bg->bg_bits),
1371 le16_to_cpu(bg->bg_free_bits_count),
1372 num_bits);
1373 }
1374 while(num_bits--)
1375 ocfs2_set_bit(bit_off++, bitmap);
1376
1377 ocfs2_journal_dirty(handle, group_bh);
1378
1379 bail:
1380 return status;
1381 }
1382
1383 /* find the one with the most empty bits */
1384 static inline u16 ocfs2_find_victim_chain(struct ocfs2_chain_list *cl)
1385 {
1386 u16 curr, best;
1387
1388 BUG_ON(!cl->cl_next_free_rec);
1389
1390 best = curr = 0;
1391 while (curr < le16_to_cpu(cl->cl_next_free_rec)) {
1392 if (le32_to_cpu(cl->cl_recs[curr].c_free) >
1393 le32_to_cpu(cl->cl_recs[best].c_free))
1394 best = curr;
1395 curr++;
1396 }
1397
1398 BUG_ON(best >= le16_to_cpu(cl->cl_next_free_rec));
1399 return best;
1400 }
1401
1402 static int ocfs2_relink_block_group(handle_t *handle,
1403 struct inode *alloc_inode,
1404 struct buffer_head *fe_bh,
1405 struct buffer_head *bg_bh,
1406 struct buffer_head *prev_bg_bh,
1407 u16 chain)
1408 {
1409 int status;
1410 /* there is a really tiny chance the journal calls could fail,
1411 * but we wouldn't want inconsistent blocks in *any* case. */
1412 u64 bg_ptr, prev_bg_ptr;
1413 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) fe_bh->b_data;
1414 struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data;
1415 struct ocfs2_group_desc *prev_bg = (struct ocfs2_group_desc *) prev_bg_bh->b_data;
1416
1417 /* The caller got these descriptors from
1418 * ocfs2_read_group_descriptor(). Any corruption is a code bug. */
1419 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
1420 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(prev_bg));
1421
1422 trace_ocfs2_relink_block_group(
1423 (unsigned long long)le64_to_cpu(fe->i_blkno), chain,
1424 (unsigned long long)le64_to_cpu(bg->bg_blkno),
1425 (unsigned long long)le64_to_cpu(prev_bg->bg_blkno));
1426
1427 bg_ptr = le64_to_cpu(bg->bg_next_group);
1428 prev_bg_ptr = le64_to_cpu(prev_bg->bg_next_group);
1429
1430 status = ocfs2_journal_access_gd(handle, INODE_CACHE(alloc_inode),
1431 prev_bg_bh,
1432 OCFS2_JOURNAL_ACCESS_WRITE);
1433 if (status < 0)
1434 goto out;
1435
1436 prev_bg->bg_next_group = bg->bg_next_group;
1437 ocfs2_journal_dirty(handle, prev_bg_bh);
1438
1439 status = ocfs2_journal_access_gd(handle, INODE_CACHE(alloc_inode),
1440 bg_bh, OCFS2_JOURNAL_ACCESS_WRITE);
1441 if (status < 0)
1442 goto out_rollback_prev_bg;
1443
1444 bg->bg_next_group = fe->id2.i_chain.cl_recs[chain].c_blkno;
1445 ocfs2_journal_dirty(handle, bg_bh);
1446
1447 status = ocfs2_journal_access_di(handle, INODE_CACHE(alloc_inode),
1448 fe_bh, OCFS2_JOURNAL_ACCESS_WRITE);
1449 if (status < 0)
1450 goto out_rollback_bg;
1451
1452 fe->id2.i_chain.cl_recs[chain].c_blkno = bg->bg_blkno;
1453 ocfs2_journal_dirty(handle, fe_bh);
1454
1455 out:
1456 if (status < 0)
1457 mlog_errno(status);
1458 return status;
1459
1460 out_rollback_bg:
1461 bg->bg_next_group = cpu_to_le64(bg_ptr);
1462 out_rollback_prev_bg:
1463 prev_bg->bg_next_group = cpu_to_le64(prev_bg_ptr);
1464 goto out;
1465 }
1466
1467 static inline int ocfs2_block_group_reasonably_empty(struct ocfs2_group_desc *bg,
1468 u32 wanted)
1469 {
1470 return le16_to_cpu(bg->bg_free_bits_count) > wanted;
1471 }
1472
1473 /* return 0 on success, -ENOSPC to keep searching and any other < 0
1474 * value on error. */
1475 static int ocfs2_cluster_group_search(struct inode *inode,
1476 struct buffer_head *group_bh,
1477 u32 bits_wanted, u32 min_bits,
1478 u64 max_block,
1479 struct ocfs2_suballoc_result *res)
1480 {
1481 int search = -ENOSPC;
1482 int ret;
1483 u64 blkoff;
1484 struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *) group_bh->b_data;
1485 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1486 unsigned int max_bits, gd_cluster_off;
1487
1488 BUG_ON(!ocfs2_is_cluster_bitmap(inode));
1489
1490 if (gd->bg_free_bits_count) {
1491 max_bits = le16_to_cpu(gd->bg_bits);
1492
1493 /* Tail groups in cluster bitmaps which aren't cpg
1494 * aligned are prone to partial extension by a failed
1495 * fs resize. If the file system resize never got to
1496 * update the dinode cluster count, then we don't want
1497 * to trust any clusters past it, regardless of what
1498 * the group descriptor says. */
1499 gd_cluster_off = ocfs2_blocks_to_clusters(inode->i_sb,
1500 le64_to_cpu(gd->bg_blkno));
1501 if ((gd_cluster_off + max_bits) >
1502 OCFS2_I(inode)->ip_clusters) {
1503 max_bits = OCFS2_I(inode)->ip_clusters - gd_cluster_off;
1504 trace_ocfs2_cluster_group_search_wrong_max_bits(
1505 (unsigned long long)le64_to_cpu(gd->bg_blkno),
1506 le16_to_cpu(gd->bg_bits),
1507 OCFS2_I(inode)->ip_clusters, max_bits);
1508 }
1509
1510 ret = ocfs2_block_group_find_clear_bits(osb,
1511 group_bh, bits_wanted,
1512 max_bits, res);
1513 if (ret)
1514 return ret;
1515
1516 if (max_block) {
1517 blkoff = ocfs2_clusters_to_blocks(inode->i_sb,
1518 gd_cluster_off +
1519 res->sr_bit_offset +
1520 res->sr_bits);
1521 trace_ocfs2_cluster_group_search_max_block(
1522 (unsigned long long)blkoff,
1523 (unsigned long long)max_block);
1524 if (blkoff > max_block)
1525 return -ENOSPC;
1526 }
1527
1528 /* ocfs2_block_group_find_clear_bits() might
1529 * return success, but we still want to return
1530 * -ENOSPC unless it found the minimum number
1531 * of bits. */
1532 if (min_bits <= res->sr_bits)
1533 search = 0; /* success */
1534 else if (res->sr_bits) {
1535 /*
1536 * Don't show bits which we'll be returning
1537 * for allocation to the local alloc bitmap.
1538 */
1539 ocfs2_local_alloc_seen_free_bits(osb, res->sr_bits);
1540 }
1541 }
1542
1543 return search;
1544 }
1545
1546 static int ocfs2_block_group_search(struct inode *inode,
1547 struct buffer_head *group_bh,
1548 u32 bits_wanted, u32 min_bits,
1549 u64 max_block,
1550 struct ocfs2_suballoc_result *res)
1551 {
1552 int ret = -ENOSPC;
1553 u64 blkoff;
1554 struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) group_bh->b_data;
1555
1556 BUG_ON(min_bits != 1);
1557 BUG_ON(ocfs2_is_cluster_bitmap(inode));
1558
1559 if (bg->bg_free_bits_count) {
1560 ret = ocfs2_block_group_find_clear_bits(OCFS2_SB(inode->i_sb),
1561 group_bh, bits_wanted,
1562 le16_to_cpu(bg->bg_bits),
1563 res);
1564 if (!ret && max_block) {
1565 blkoff = le64_to_cpu(bg->bg_blkno) +
1566 res->sr_bit_offset + res->sr_bits;
1567 trace_ocfs2_block_group_search_max_block(
1568 (unsigned long long)blkoff,
1569 (unsigned long long)max_block);
1570 if (blkoff > max_block)
1571 ret = -ENOSPC;
1572 }
1573 }
1574
1575 return ret;
1576 }
1577
1578 int ocfs2_alloc_dinode_update_counts(struct inode *inode,
1579 handle_t *handle,
1580 struct buffer_head *di_bh,
1581 u32 num_bits,
1582 u16 chain)
1583 {
1584 int ret;
1585 u32 tmp_used;
1586 struct ocfs2_dinode *di = (struct ocfs2_dinode *) di_bh->b_data;
1587 struct ocfs2_chain_list *cl = (struct ocfs2_chain_list *) &di->id2.i_chain;
1588
1589 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
1590 OCFS2_JOURNAL_ACCESS_WRITE);
1591 if (ret < 0) {
1592 mlog_errno(ret);
1593 goto out;
1594 }
1595
1596 tmp_used = le32_to_cpu(di->id1.bitmap1.i_used);
1597 di->id1.bitmap1.i_used = cpu_to_le32(num_bits + tmp_used);
1598 le32_add_cpu(&cl->cl_recs[chain].c_free, -num_bits);
1599 ocfs2_journal_dirty(handle, di_bh);
1600
1601 out:
1602 return ret;
1603 }
1604
1605 void ocfs2_rollback_alloc_dinode_counts(struct inode *inode,
1606 struct buffer_head *di_bh,
1607 u32 num_bits,
1608 u16 chain)
1609 {
1610 u32 tmp_used;
1611 struct ocfs2_dinode *di = (struct ocfs2_dinode *) di_bh->b_data;
1612 struct ocfs2_chain_list *cl;
1613
1614 cl = (struct ocfs2_chain_list *)&di->id2.i_chain;
1615 tmp_used = le32_to_cpu(di->id1.bitmap1.i_used);
1616 di->id1.bitmap1.i_used = cpu_to_le32(tmp_used - num_bits);
1617 le32_add_cpu(&cl->cl_recs[chain].c_free, num_bits);
1618 }
1619
1620 static int ocfs2_bg_discontig_fix_by_rec(struct ocfs2_suballoc_result *res,
1621 struct ocfs2_extent_rec *rec,
1622 struct ocfs2_chain_list *cl)
1623 {
1624 unsigned int bpc = le16_to_cpu(cl->cl_bpc);
1625 unsigned int bitoff = le32_to_cpu(rec->e_cpos) * bpc;
1626 unsigned int bitcount = le16_to_cpu(rec->e_leaf_clusters) * bpc;
1627
1628 if (res->sr_bit_offset < bitoff)
1629 return 0;
1630 if (res->sr_bit_offset >= (bitoff + bitcount))
1631 return 0;
1632 res->sr_blkno = le64_to_cpu(rec->e_blkno) +
1633 (res->sr_bit_offset - bitoff);
1634 if ((res->sr_bit_offset + res->sr_bits) > (bitoff + bitcount))
1635 res->sr_bits = (bitoff + bitcount) - res->sr_bit_offset;
1636 return 1;
1637 }
1638
1639 static void ocfs2_bg_discontig_fix_result(struct ocfs2_alloc_context *ac,
1640 struct ocfs2_group_desc *bg,
1641 struct ocfs2_suballoc_result *res)
1642 {
1643 int i;
1644 u64 bg_blkno = res->sr_bg_blkno; /* Save off */
1645 struct ocfs2_extent_rec *rec;
1646 struct ocfs2_dinode *di = (struct ocfs2_dinode *)ac->ac_bh->b_data;
1647 struct ocfs2_chain_list *cl = &di->id2.i_chain;
1648
1649 if (ocfs2_is_cluster_bitmap(ac->ac_inode)) {
1650 res->sr_blkno = 0;
1651 return;
1652 }
1653
1654 res->sr_blkno = res->sr_bg_blkno + res->sr_bit_offset;
1655 res->sr_bg_blkno = 0; /* Clear it for contig block groups */
1656 if (!ocfs2_supports_discontig_bg(OCFS2_SB(ac->ac_inode->i_sb)) ||
1657 !bg->bg_list.l_next_free_rec)
1658 return;
1659
1660 for (i = 0; i < le16_to_cpu(bg->bg_list.l_next_free_rec); i++) {
1661 rec = &bg->bg_list.l_recs[i];
1662 if (ocfs2_bg_discontig_fix_by_rec(res, rec, cl)) {
1663 res->sr_bg_blkno = bg_blkno; /* Restore */
1664 break;
1665 }
1666 }
1667 }
1668
1669 static int ocfs2_search_one_group(struct ocfs2_alloc_context *ac,
1670 handle_t *handle,
1671 u32 bits_wanted,
1672 u32 min_bits,
1673 struct ocfs2_suballoc_result *res,
1674 u16 *bits_left)
1675 {
1676 int ret;
1677 struct buffer_head *group_bh = NULL;
1678 struct ocfs2_group_desc *gd;
1679 struct ocfs2_dinode *di = (struct ocfs2_dinode *)ac->ac_bh->b_data;
1680 struct inode *alloc_inode = ac->ac_inode;
1681
1682 ret = ocfs2_read_group_descriptor(alloc_inode, di,
1683 res->sr_bg_blkno, &group_bh);
1684 if (ret < 0) {
1685 mlog_errno(ret);
1686 return ret;
1687 }
1688
1689 gd = (struct ocfs2_group_desc *) group_bh->b_data;
1690 ret = ac->ac_group_search(alloc_inode, group_bh, bits_wanted, min_bits,
1691 ac->ac_max_block, res);
1692 if (ret < 0) {
1693 if (ret != -ENOSPC)
1694 mlog_errno(ret);
1695 goto out;
1696 }
1697
1698 if (!ret)
1699 ocfs2_bg_discontig_fix_result(ac, gd, res);
1700
1701 /*
1702 * sr_bg_blkno might have been changed by
1703 * ocfs2_bg_discontig_fix_result
1704 */
1705 res->sr_bg_stable_blkno = group_bh->b_blocknr;
1706
1707 if (ac->ac_find_loc_only)
1708 goto out_loc_only;
1709
1710 ret = ocfs2_alloc_dinode_update_counts(alloc_inode, handle, ac->ac_bh,
1711 res->sr_bits,
1712 le16_to_cpu(gd->bg_chain));
1713 if (ret < 0) {
1714 mlog_errno(ret);
1715 goto out;
1716 }
1717
1718 ret = ocfs2_block_group_set_bits(handle, alloc_inode, gd, group_bh,
1719 res->sr_bit_offset, res->sr_bits);
1720 if (ret < 0) {
1721 ocfs2_rollback_alloc_dinode_counts(alloc_inode, ac->ac_bh,
1722 res->sr_bits,
1723 le16_to_cpu(gd->bg_chain));
1724 mlog_errno(ret);
1725 }
1726
1727 out_loc_only:
1728 *bits_left = le16_to_cpu(gd->bg_free_bits_count);
1729
1730 out:
1731 brelse(group_bh);
1732
1733 return ret;
1734 }
1735
1736 static int ocfs2_search_chain(struct ocfs2_alloc_context *ac,
1737 handle_t *handle,
1738 u32 bits_wanted,
1739 u32 min_bits,
1740 struct ocfs2_suballoc_result *res,
1741 u16 *bits_left)
1742 {
1743 int status;
1744 u16 chain;
1745 u64 next_group;
1746 struct inode *alloc_inode = ac->ac_inode;
1747 struct buffer_head *group_bh = NULL;
1748 struct buffer_head *prev_group_bh = NULL;
1749 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) ac->ac_bh->b_data;
1750 struct ocfs2_chain_list *cl = (struct ocfs2_chain_list *) &fe->id2.i_chain;
1751 struct ocfs2_group_desc *bg;
1752
1753 chain = ac->ac_chain;
1754 trace_ocfs2_search_chain_begin(
1755 (unsigned long long)OCFS2_I(alloc_inode)->ip_blkno,
1756 bits_wanted, chain);
1757
1758 status = ocfs2_read_group_descriptor(alloc_inode, fe,
1759 le64_to_cpu(cl->cl_recs[chain].c_blkno),
1760 &group_bh);
1761 if (status < 0) {
1762 mlog_errno(status);
1763 goto bail;
1764 }
1765 bg = (struct ocfs2_group_desc *) group_bh->b_data;
1766
1767 status = -ENOSPC;
1768 /* for now, the chain search is a bit simplistic. We just use
1769 * the 1st group with any empty bits. */
1770 while ((status = ac->ac_group_search(alloc_inode, group_bh,
1771 bits_wanted, min_bits,
1772 ac->ac_max_block,
1773 res)) == -ENOSPC) {
1774 if (!bg->bg_next_group)
1775 break;
1776
1777 brelse(prev_group_bh);
1778 prev_group_bh = NULL;
1779
1780 next_group = le64_to_cpu(bg->bg_next_group);
1781 prev_group_bh = group_bh;
1782 group_bh = NULL;
1783 status = ocfs2_read_group_descriptor(alloc_inode, fe,
1784 next_group, &group_bh);
1785 if (status < 0) {
1786 mlog_errno(status);
1787 goto bail;
1788 }
1789 bg = (struct ocfs2_group_desc *) group_bh->b_data;
1790 }
1791 if (status < 0) {
1792 if (status != -ENOSPC)
1793 mlog_errno(status);
1794 goto bail;
1795 }
1796
1797 trace_ocfs2_search_chain_succ(
1798 (unsigned long long)le64_to_cpu(bg->bg_blkno), res->sr_bits);
1799
1800 res->sr_bg_blkno = le64_to_cpu(bg->bg_blkno);
1801
1802 BUG_ON(res->sr_bits == 0);
1803 if (!status)
1804 ocfs2_bg_discontig_fix_result(ac, bg, res);
1805
1806 /*
1807 * sr_bg_blkno might have been changed by
1808 * ocfs2_bg_discontig_fix_result
1809 */
1810 res->sr_bg_stable_blkno = group_bh->b_blocknr;
1811
1812 /*
1813 * Keep track of previous block descriptor read. When
1814 * we find a target, if we have read more than X
1815 * number of descriptors, and the target is reasonably
1816 * empty, relink him to top of his chain.
1817 *
1818 * We've read 0 extra blocks and only send one more to
1819 * the transaction, yet the next guy to search has a
1820 * much easier time.
1821 *
1822 * Do this *after* figuring out how many bits we're taking out
1823 * of our target group.
1824 */
1825 if (!ac->ac_disable_chain_relink &&
1826 (prev_group_bh) &&
1827 (ocfs2_block_group_reasonably_empty(bg, res->sr_bits))) {
1828 status = ocfs2_relink_block_group(handle, alloc_inode,
1829 ac->ac_bh, group_bh,
1830 prev_group_bh, chain);
1831 if (status < 0) {
1832 mlog_errno(status);
1833 goto bail;
1834 }
1835 }
1836
1837 if (ac->ac_find_loc_only)
1838 goto out_loc_only;
1839
1840 status = ocfs2_alloc_dinode_update_counts(alloc_inode, handle,
1841 ac->ac_bh, res->sr_bits,
1842 chain);
1843 if (status) {
1844 mlog_errno(status);
1845 goto bail;
1846 }
1847
1848 status = ocfs2_block_group_set_bits(handle,
1849 alloc_inode,
1850 bg,
1851 group_bh,
1852 res->sr_bit_offset,
1853 res->sr_bits);
1854 if (status < 0) {
1855 ocfs2_rollback_alloc_dinode_counts(alloc_inode,
1856 ac->ac_bh, res->sr_bits, chain);
1857 mlog_errno(status);
1858 goto bail;
1859 }
1860
1861 trace_ocfs2_search_chain_end(
1862 (unsigned long long)le64_to_cpu(fe->i_blkno),
1863 res->sr_bits);
1864
1865 out_loc_only:
1866 *bits_left = le16_to_cpu(bg->bg_free_bits_count);
1867 bail:
1868 brelse(group_bh);
1869 brelse(prev_group_bh);
1870
1871 if (status)
1872 mlog_errno(status);
1873 return status;
1874 }
1875
1876 /* will give out up to bits_wanted contiguous bits. */
1877 static int ocfs2_claim_suballoc_bits(struct ocfs2_alloc_context *ac,
1878 handle_t *handle,
1879 u32 bits_wanted,
1880 u32 min_bits,
1881 struct ocfs2_suballoc_result *res)
1882 {
1883 int status;
1884 u16 victim, i;
1885 u16 bits_left = 0;
1886 u64 hint = ac->ac_last_group;
1887 struct ocfs2_chain_list *cl;
1888 struct ocfs2_dinode *fe;
1889
1890 BUG_ON(ac->ac_bits_given >= ac->ac_bits_wanted);
1891 BUG_ON(bits_wanted > (ac->ac_bits_wanted - ac->ac_bits_given));
1892 BUG_ON(!ac->ac_bh);
1893
1894 fe = (struct ocfs2_dinode *) ac->ac_bh->b_data;
1895
1896 /* The bh was validated by the inode read during
1897 * ocfs2_reserve_suballoc_bits(). Any corruption is a code bug. */
1898 BUG_ON(!OCFS2_IS_VALID_DINODE(fe));
1899
1900 if (le32_to_cpu(fe->id1.bitmap1.i_used) >=
1901 le32_to_cpu(fe->id1.bitmap1.i_total)) {
1902 status = ocfs2_error(ac->ac_inode->i_sb,
1903 "Chain allocator dinode %llu has %u used bits but only %u total\n",
1904 (unsigned long long)le64_to_cpu(fe->i_blkno),
1905 le32_to_cpu(fe->id1.bitmap1.i_used),
1906 le32_to_cpu(fe->id1.bitmap1.i_total));
1907 goto bail;
1908 }
1909
1910 res->sr_bg_blkno = hint;
1911 if (res->sr_bg_blkno) {
1912 /* Attempt to short-circuit the usual search mechanism
1913 * by jumping straight to the most recently used
1914 * allocation group. This helps us maintain some
1915 * contiguousness across allocations. */
1916 status = ocfs2_search_one_group(ac, handle, bits_wanted,
1917 min_bits, res, &bits_left);
1918 if (!status)
1919 goto set_hint;
1920 if (status < 0 && status != -ENOSPC) {
1921 mlog_errno(status);
1922 goto bail;
1923 }
1924 }
1925
1926 cl = (struct ocfs2_chain_list *) &fe->id2.i_chain;
1927
1928 victim = ocfs2_find_victim_chain(cl);
1929 ac->ac_chain = victim;
1930
1931 status = ocfs2_search_chain(ac, handle, bits_wanted, min_bits,
1932 res, &bits_left);
1933 if (!status) {
1934 if (ocfs2_is_cluster_bitmap(ac->ac_inode))
1935 hint = res->sr_bg_blkno;
1936 else
1937 hint = ocfs2_group_from_res(res);
1938 goto set_hint;
1939 }
1940 if (status < 0 && status != -ENOSPC) {
1941 mlog_errno(status);
1942 goto bail;
1943 }
1944
1945 trace_ocfs2_claim_suballoc_bits(victim);
1946
1947 /* If we didn't pick a good victim, then just default to
1948 * searching each chain in order. Don't allow chain relinking
1949 * because we only calculate enough journal credits for one
1950 * relink per alloc. */
1951 ac->ac_disable_chain_relink = 1;
1952 for (i = 0; i < le16_to_cpu(cl->cl_next_free_rec); i ++) {
1953 if (i == victim)
1954 continue;
1955 if (!cl->cl_recs[i].c_free)
1956 continue;
1957
1958 ac->ac_chain = i;
1959 status = ocfs2_search_chain(ac, handle, bits_wanted, min_bits,
1960 res, &bits_left);
1961 if (!status) {
1962 hint = ocfs2_group_from_res(res);
1963 break;
1964 }
1965 if (status < 0 && status != -ENOSPC) {
1966 mlog_errno(status);
1967 goto bail;
1968 }
1969 }
1970
1971 set_hint:
1972 if (status != -ENOSPC) {
1973 /* If the next search of this group is not likely to
1974 * yield a suitable extent, then we reset the last
1975 * group hint so as to not waste a disk read */
1976 if (bits_left < min_bits)
1977 ac->ac_last_group = 0;
1978 else
1979 ac->ac_last_group = hint;
1980 }
1981
1982 bail:
1983 if (status)
1984 mlog_errno(status);
1985 return status;
1986 }
1987
1988 int ocfs2_claim_metadata(handle_t *handle,
1989 struct ocfs2_alloc_context *ac,
1990 u32 bits_wanted,
1991 u64 *suballoc_loc,
1992 u16 *suballoc_bit_start,
1993 unsigned int *num_bits,
1994 u64 *blkno_start)
1995 {
1996 int status;
1997 struct ocfs2_suballoc_result res = { .sr_blkno = 0, };
1998
1999 BUG_ON(!ac);
2000 BUG_ON(ac->ac_bits_wanted < (ac->ac_bits_given + bits_wanted));
2001 BUG_ON(ac->ac_which != OCFS2_AC_USE_META);
2002
2003 status = ocfs2_claim_suballoc_bits(ac,
2004 handle,
2005 bits_wanted,
2006 1,
2007 &res);
2008 if (status < 0) {
2009 mlog_errno(status);
2010 goto bail;
2011 }
2012 atomic_inc(&OCFS2_SB(ac->ac_inode->i_sb)->alloc_stats.bg_allocs);
2013
2014 *suballoc_loc = res.sr_bg_blkno;
2015 *suballoc_bit_start = res.sr_bit_offset;
2016 *blkno_start = res.sr_blkno;
2017 ac->ac_bits_given += res.sr_bits;
2018 *num_bits = res.sr_bits;
2019 status = 0;
2020 bail:
2021 if (status)
2022 mlog_errno(status);
2023 return status;
2024 }
2025
2026 static void ocfs2_init_inode_ac_group(struct inode *dir,
2027 struct buffer_head *parent_di_bh,
2028 struct ocfs2_alloc_context *ac)
2029 {
2030 struct ocfs2_dinode *di = (struct ocfs2_dinode *)parent_di_bh->b_data;
2031 /*
2032 * Try to allocate inodes from some specific group.
2033 *
2034 * If the parent dir has recorded the last group used in allocation,
2035 * cool, use it. Otherwise if we try to allocate new inode from the
2036 * same slot the parent dir belongs to, use the same chunk.
2037 *
2038 * We are very careful here to avoid the mistake of setting
2039 * ac_last_group to a group descriptor from a different (unlocked) slot.
2040 */
2041 if (OCFS2_I(dir)->ip_last_used_group &&
2042 OCFS2_I(dir)->ip_last_used_slot == ac->ac_alloc_slot)
2043 ac->ac_last_group = OCFS2_I(dir)->ip_last_used_group;
2044 else if (le16_to_cpu(di->i_suballoc_slot) == ac->ac_alloc_slot) {
2045 if (di->i_suballoc_loc)
2046 ac->ac_last_group = le64_to_cpu(di->i_suballoc_loc);
2047 else
2048 ac->ac_last_group = ocfs2_which_suballoc_group(
2049 le64_to_cpu(di->i_blkno),
2050 le16_to_cpu(di->i_suballoc_bit));
2051 }
2052 }
2053
2054 static inline void ocfs2_save_inode_ac_group(struct inode *dir,
2055 struct ocfs2_alloc_context *ac)
2056 {
2057 OCFS2_I(dir)->ip_last_used_group = ac->ac_last_group;
2058 OCFS2_I(dir)->ip_last_used_slot = ac->ac_alloc_slot;
2059 }
2060
2061 int ocfs2_find_new_inode_loc(struct inode *dir,
2062 struct buffer_head *parent_fe_bh,
2063 struct ocfs2_alloc_context *ac,
2064 u64 *fe_blkno)
2065 {
2066 int ret;
2067 handle_t *handle = NULL;
2068 struct ocfs2_suballoc_result *res;
2069
2070 BUG_ON(!ac);
2071 BUG_ON(ac->ac_bits_given != 0);
2072 BUG_ON(ac->ac_bits_wanted != 1);
2073 BUG_ON(ac->ac_which != OCFS2_AC_USE_INODE);
2074
2075 res = kzalloc(sizeof(*res), GFP_NOFS);
2076 if (res == NULL) {
2077 ret = -ENOMEM;
2078 mlog_errno(ret);
2079 goto out;
2080 }
2081
2082 ocfs2_init_inode_ac_group(dir, parent_fe_bh, ac);
2083
2084 /*
2085 * The handle started here is for chain relink. Alternatively,
2086 * we could just disable relink for these calls.
2087 */
2088 handle = ocfs2_start_trans(OCFS2_SB(dir->i_sb), OCFS2_SUBALLOC_ALLOC);
2089 if (IS_ERR(handle)) {
2090 ret = PTR_ERR(handle);
2091 handle = NULL;
2092 mlog_errno(ret);
2093 goto out;
2094 }
2095
2096 /*
2097 * This will instruct ocfs2_claim_suballoc_bits and
2098 * ocfs2_search_one_group to search but save actual allocation
2099 * for later.
2100 */
2101 ac->ac_find_loc_only = 1;
2102
2103 ret = ocfs2_claim_suballoc_bits(ac, handle, 1, 1, res);
2104 if (ret < 0) {
2105 mlog_errno(ret);
2106 goto out;
2107 }
2108
2109 ac->ac_find_loc_priv = res;
2110 *fe_blkno = res->sr_blkno;
2111 ocfs2_update_inode_fsync_trans(handle, dir, 0);
2112 out:
2113 if (handle)
2114 ocfs2_commit_trans(OCFS2_SB(dir->i_sb), handle);
2115
2116 if (ret)
2117 kfree(res);
2118
2119 return ret;
2120 }
2121
2122 int ocfs2_claim_new_inode_at_loc(handle_t *handle,
2123 struct inode *dir,
2124 struct ocfs2_alloc_context *ac,
2125 u64 *suballoc_loc,
2126 u16 *suballoc_bit,
2127 u64 di_blkno)
2128 {
2129 int ret;
2130 u16 chain;
2131 struct ocfs2_suballoc_result *res = ac->ac_find_loc_priv;
2132 struct buffer_head *bg_bh = NULL;
2133 struct ocfs2_group_desc *bg;
2134 struct ocfs2_dinode *di = (struct ocfs2_dinode *) ac->ac_bh->b_data;
2135
2136 /*
2137 * Since di_blkno is being passed back in, we check for any
2138 * inconsistencies which may have happened between
2139 * calls. These are code bugs as di_blkno is not expected to
2140 * change once returned from ocfs2_find_new_inode_loc()
2141 */
2142 BUG_ON(res->sr_blkno != di_blkno);
2143
2144 ret = ocfs2_read_group_descriptor(ac->ac_inode, di,
2145 res->sr_bg_stable_blkno, &bg_bh);
2146 if (ret) {
2147 mlog_errno(ret);
2148 goto out;
2149 }
2150
2151 bg = (struct ocfs2_group_desc *) bg_bh->b_data;
2152 chain = le16_to_cpu(bg->bg_chain);
2153
2154 ret = ocfs2_alloc_dinode_update_counts(ac->ac_inode, handle,
2155 ac->ac_bh, res->sr_bits,
2156 chain);
2157 if (ret) {
2158 mlog_errno(ret);
2159 goto out;
2160 }
2161
2162 ret = ocfs2_block_group_set_bits(handle,
2163 ac->ac_inode,
2164 bg,
2165 bg_bh,
2166 res->sr_bit_offset,
2167 res->sr_bits);
2168 if (ret < 0) {
2169 ocfs2_rollback_alloc_dinode_counts(ac->ac_inode,
2170 ac->ac_bh, res->sr_bits, chain);
2171 mlog_errno(ret);
2172 goto out;
2173 }
2174
2175 trace_ocfs2_claim_new_inode_at_loc((unsigned long long)di_blkno,
2176 res->sr_bits);
2177
2178 atomic_inc(&OCFS2_SB(ac->ac_inode->i_sb)->alloc_stats.bg_allocs);
2179
2180 BUG_ON(res->sr_bits != 1);
2181
2182 *suballoc_loc = res->sr_bg_blkno;
2183 *suballoc_bit = res->sr_bit_offset;
2184 ac->ac_bits_given++;
2185 ocfs2_save_inode_ac_group(dir, ac);
2186
2187 out:
2188 brelse(bg_bh);
2189
2190 return ret;
2191 }
2192
2193 int ocfs2_claim_new_inode(handle_t *handle,
2194 struct inode *dir,
2195 struct buffer_head *parent_fe_bh,
2196 struct ocfs2_alloc_context *ac,
2197 u64 *suballoc_loc,
2198 u16 *suballoc_bit,
2199 u64 *fe_blkno)
2200 {
2201 int status;
2202 struct ocfs2_suballoc_result res;
2203
2204 BUG_ON(!ac);
2205 BUG_ON(ac->ac_bits_given != 0);
2206 BUG_ON(ac->ac_bits_wanted != 1);
2207 BUG_ON(ac->ac_which != OCFS2_AC_USE_INODE);
2208
2209 ocfs2_init_inode_ac_group(dir, parent_fe_bh, ac);
2210
2211 status = ocfs2_claim_suballoc_bits(ac,
2212 handle,
2213 1,
2214 1,
2215 &res);
2216 if (status < 0) {
2217 mlog_errno(status);
2218 goto bail;
2219 }
2220 atomic_inc(&OCFS2_SB(ac->ac_inode->i_sb)->alloc_stats.bg_allocs);
2221
2222 BUG_ON(res.sr_bits != 1);
2223
2224 *suballoc_loc = res.sr_bg_blkno;
2225 *suballoc_bit = res.sr_bit_offset;
2226 *fe_blkno = res.sr_blkno;
2227 ac->ac_bits_given++;
2228 ocfs2_save_inode_ac_group(dir, ac);
2229 status = 0;
2230 bail:
2231 if (status)
2232 mlog_errno(status);
2233 return status;
2234 }
2235
2236 /* translate a group desc. blkno and it's bitmap offset into
2237 * disk cluster offset. */
2238 static inline u32 ocfs2_desc_bitmap_to_cluster_off(struct inode *inode,
2239 u64 bg_blkno,
2240 u16 bg_bit_off)
2241 {
2242 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2243 u32 cluster = 0;
2244
2245 BUG_ON(!ocfs2_is_cluster_bitmap(inode));
2246
2247 if (bg_blkno != osb->first_cluster_group_blkno)
2248 cluster = ocfs2_blocks_to_clusters(inode->i_sb, bg_blkno);
2249 cluster += (u32) bg_bit_off;
2250 return cluster;
2251 }
2252
2253 /* given a cluster offset, calculate which block group it belongs to
2254 * and return that block offset. */
2255 u64 ocfs2_which_cluster_group(struct inode *inode, u32 cluster)
2256 {
2257 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2258 u32 group_no;
2259
2260 BUG_ON(!ocfs2_is_cluster_bitmap(inode));
2261
2262 group_no = cluster / osb->bitmap_cpg;
2263 if (!group_no)
2264 return osb->first_cluster_group_blkno;
2265 return ocfs2_clusters_to_blocks(inode->i_sb,
2266 group_no * osb->bitmap_cpg);
2267 }
2268
2269 /* given the block number of a cluster start, calculate which cluster
2270 * group and descriptor bitmap offset that corresponds to. */
2271 static inline void ocfs2_block_to_cluster_group(struct inode *inode,
2272 u64 data_blkno,
2273 u64 *bg_blkno,
2274 u16 *bg_bit_off)
2275 {
2276 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2277 u32 data_cluster = ocfs2_blocks_to_clusters(osb->sb, data_blkno);
2278
2279 BUG_ON(!ocfs2_is_cluster_bitmap(inode));
2280
2281 *bg_blkno = ocfs2_which_cluster_group(inode,
2282 data_cluster);
2283
2284 if (*bg_blkno == osb->first_cluster_group_blkno)
2285 *bg_bit_off = (u16) data_cluster;
2286 else
2287 *bg_bit_off = (u16) ocfs2_blocks_to_clusters(osb->sb,
2288 data_blkno - *bg_blkno);
2289 }
2290
2291 /*
2292 * min_bits - minimum contiguous chunk from this total allocation we
2293 * can handle. set to what we asked for originally for a full
2294 * contig. allocation, set to '1' to indicate we can deal with extents
2295 * of any size.
2296 */
2297 int __ocfs2_claim_clusters(handle_t *handle,
2298 struct ocfs2_alloc_context *ac,
2299 u32 min_clusters,
2300 u32 max_clusters,
2301 u32 *cluster_start,
2302 u32 *num_clusters)
2303 {
2304 int status;
2305 unsigned int bits_wanted = max_clusters;
2306 struct ocfs2_suballoc_result res = { .sr_blkno = 0, };
2307 struct ocfs2_super *osb = OCFS2_SB(ac->ac_inode->i_sb);
2308
2309 BUG_ON(ac->ac_bits_given >= ac->ac_bits_wanted);
2310
2311 BUG_ON(ac->ac_which != OCFS2_AC_USE_LOCAL
2312 && ac->ac_which != OCFS2_AC_USE_MAIN);
2313
2314 if (ac->ac_which == OCFS2_AC_USE_LOCAL) {
2315 WARN_ON(min_clusters > 1);
2316
2317 status = ocfs2_claim_local_alloc_bits(osb,
2318 handle,
2319 ac,
2320 bits_wanted,
2321 cluster_start,
2322 num_clusters);
2323 if (!status)
2324 atomic_inc(&osb->alloc_stats.local_data);
2325 } else {
2326 if (min_clusters > (osb->bitmap_cpg - 1)) {
2327 /* The only paths asking for contiguousness
2328 * should know about this already. */
2329 mlog(ML_ERROR, "minimum allocation requested %u exceeds "
2330 "group bitmap size %u!\n", min_clusters,
2331 osb->bitmap_cpg);
2332 status = -ENOSPC;
2333 goto bail;
2334 }
2335 /* clamp the current request down to a realistic size. */
2336 if (bits_wanted > (osb->bitmap_cpg - 1))
2337 bits_wanted = osb->bitmap_cpg - 1;
2338
2339 status = ocfs2_claim_suballoc_bits(ac,
2340 handle,
2341 bits_wanted,
2342 min_clusters,
2343 &res);
2344 if (!status) {
2345 BUG_ON(res.sr_blkno); /* cluster alloc can't set */
2346 *cluster_start =
2347 ocfs2_desc_bitmap_to_cluster_off(ac->ac_inode,
2348 res.sr_bg_blkno,
2349 res.sr_bit_offset);
2350 atomic_inc(&osb->alloc_stats.bitmap_data);
2351 *num_clusters = res.sr_bits;
2352 }
2353 }
2354 if (status < 0) {
2355 if (status != -ENOSPC)
2356 mlog_errno(status);
2357 goto bail;
2358 }
2359
2360 ac->ac_bits_given += *num_clusters;
2361
2362 bail:
2363 if (status)
2364 mlog_errno(status);
2365 return status;
2366 }
2367
2368 int ocfs2_claim_clusters(handle_t *handle,
2369 struct ocfs2_alloc_context *ac,
2370 u32 min_clusters,
2371 u32 *cluster_start,
2372 u32 *num_clusters)
2373 {
2374 unsigned int bits_wanted = ac->ac_bits_wanted - ac->ac_bits_given;
2375
2376 return __ocfs2_claim_clusters(handle, ac, min_clusters,
2377 bits_wanted, cluster_start, num_clusters);
2378 }
2379
2380 static int ocfs2_block_group_clear_bits(handle_t *handle,
2381 struct inode *alloc_inode,
2382 struct ocfs2_group_desc *bg,
2383 struct buffer_head *group_bh,
2384 unsigned int bit_off,
2385 unsigned int num_bits,
2386 void (*undo_fn)(unsigned int bit,
2387 unsigned long *bmap))
2388 {
2389 int status;
2390 unsigned int tmp;
2391 struct ocfs2_group_desc *undo_bg = NULL;
2392 struct journal_head *jh;
2393
2394 /* The caller got this descriptor from
2395 * ocfs2_read_group_descriptor(). Any corruption is a code bug. */
2396 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
2397
2398 trace_ocfs2_block_group_clear_bits(bit_off, num_bits);
2399
2400 BUG_ON(undo_fn && !ocfs2_is_cluster_bitmap(alloc_inode));
2401 status = ocfs2_journal_access_gd(handle, INODE_CACHE(alloc_inode),
2402 group_bh,
2403 undo_fn ?
2404 OCFS2_JOURNAL_ACCESS_UNDO :
2405 OCFS2_JOURNAL_ACCESS_WRITE);
2406 if (status < 0) {
2407 mlog_errno(status);
2408 goto bail;
2409 }
2410
2411 jh = bh2jh(group_bh);
2412 if (undo_fn) {
2413 spin_lock(&jh->b_state_lock);
2414 undo_bg = (struct ocfs2_group_desc *) jh->b_committed_data;
2415 BUG_ON(!undo_bg);
2416 }
2417
2418 tmp = num_bits;
2419 while(tmp--) {
2420 ocfs2_clear_bit((bit_off + tmp),
2421 (unsigned long *) bg->bg_bitmap);
2422 if (undo_fn)
2423 undo_fn(bit_off + tmp,
2424 (unsigned long *) undo_bg->bg_bitmap);
2425 }
2426 le16_add_cpu(&bg->bg_free_bits_count, num_bits);
2427 if (le16_to_cpu(bg->bg_free_bits_count) > le16_to_cpu(bg->bg_bits)) {
2428 if (undo_fn)
2429 spin_unlock(&jh->b_state_lock);
2430 return ocfs2_error(alloc_inode->i_sb, "Group descriptor # %llu has bit count %u but claims %u are freed. num_bits %d\n",
2431 (unsigned long long)le64_to_cpu(bg->bg_blkno),
2432 le16_to_cpu(bg->bg_bits),
2433 le16_to_cpu(bg->bg_free_bits_count),
2434 num_bits);
2435 }
2436
2437 if (undo_fn)
2438 spin_unlock(&jh->b_state_lock);
2439
2440 ocfs2_journal_dirty(handle, group_bh);
2441 bail:
2442 return status;
2443 }
2444
2445 /*
2446 * expects the suballoc inode to already be locked.
2447 */
2448 static int _ocfs2_free_suballoc_bits(handle_t *handle,
2449 struct inode *alloc_inode,
2450 struct buffer_head *alloc_bh,
2451 unsigned int start_bit,
2452 u64 bg_blkno,
2453 unsigned int count,
2454 void (*undo_fn)(unsigned int bit,
2455 unsigned long *bitmap))
2456 {
2457 int status = 0;
2458 u32 tmp_used;
2459 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) alloc_bh->b_data;
2460 struct ocfs2_chain_list *cl = &fe->id2.i_chain;
2461 struct buffer_head *group_bh = NULL;
2462 struct ocfs2_group_desc *group;
2463
2464 /* The alloc_bh comes from ocfs2_free_dinode() or
2465 * ocfs2_free_clusters(). The callers have all locked the
2466 * allocator and gotten alloc_bh from the lock call. This
2467 * validates the dinode buffer. Any corruption that has happened
2468 * is a code bug. */
2469 BUG_ON(!OCFS2_IS_VALID_DINODE(fe));
2470 BUG_ON((count + start_bit) > ocfs2_bits_per_group(cl));
2471
2472 trace_ocfs2_free_suballoc_bits(
2473 (unsigned long long)OCFS2_I(alloc_inode)->ip_blkno,
2474 (unsigned long long)bg_blkno,
2475 start_bit, count);
2476
2477 status = ocfs2_read_group_descriptor(alloc_inode, fe, bg_blkno,
2478 &group_bh);
2479 if (status < 0) {
2480 mlog_errno(status);
2481 goto bail;
2482 }
2483 group = (struct ocfs2_group_desc *) group_bh->b_data;
2484
2485 BUG_ON((count + start_bit) > le16_to_cpu(group->bg_bits));
2486
2487 status = ocfs2_block_group_clear_bits(handle, alloc_inode,
2488 group, group_bh,
2489 start_bit, count, undo_fn);
2490 if (status < 0) {
2491 mlog_errno(status);
2492 goto bail;
2493 }
2494
2495 status = ocfs2_journal_access_di(handle, INODE_CACHE(alloc_inode),
2496 alloc_bh, OCFS2_JOURNAL_ACCESS_WRITE);
2497 if (status < 0) {
2498 mlog_errno(status);
2499 ocfs2_block_group_set_bits(handle, alloc_inode, group, group_bh,
2500 start_bit, count);
2501 goto bail;
2502 }
2503
2504 le32_add_cpu(&cl->cl_recs[le16_to_cpu(group->bg_chain)].c_free,
2505 count);
2506 tmp_used = le32_to_cpu(fe->id1.bitmap1.i_used);
2507 fe->id1.bitmap1.i_used = cpu_to_le32(tmp_used - count);
2508 ocfs2_journal_dirty(handle, alloc_bh);
2509
2510 bail:
2511 brelse(group_bh);
2512 return status;
2513 }
2514
2515 int 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
2526 int 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
2541 static 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
2581 out:
2582 return status;
2583 }
2584
2585 int ocfs2_free_clusters(handle_t *handle,
2586 struct inode *bitmap_inode,
2587 struct buffer_head *bitmap_bh,
2588 u64 start_blk,
2589 unsigned int num_clusters)
2590 {
2591 return _ocfs2_free_clusters(handle, bitmap_inode, bitmap_bh,
2592 start_blk, num_clusters,
2593 _ocfs2_set_bit);
2594 }
2595
2596 /*
2597 * Give never-used clusters back to the global bitmap. We don't need
2598 * to protect these bits in the undo buffer.
2599 */
2600 int ocfs2_release_clusters(handle_t *handle,
2601 struct inode *bitmap_inode,
2602 struct buffer_head *bitmap_bh,
2603 u64 start_blk,
2604 unsigned int num_clusters)
2605 {
2606 return _ocfs2_free_clusters(handle, bitmap_inode, bitmap_bh,
2607 start_blk, num_clusters,
2608 _ocfs2_clear_bit);
2609 }
2610
2611 /*
2612 * For a given allocation, determine which allocators will need to be
2613 * accessed, and lock them, reserving the appropriate number of bits.
2614 *
2615 * Sparse file systems call this from ocfs2_write_begin_nolock()
2616 * and ocfs2_allocate_unwritten_extents().
2617 *
2618 * File systems which don't support holes call this from
2619 * ocfs2_extend_allocation().
2620 */
2621 int ocfs2_lock_allocators(struct inode *inode,
2622 struct ocfs2_extent_tree *et,
2623 u32 clusters_to_add, u32 extents_to_split,
2624 struct ocfs2_alloc_context **data_ac,
2625 struct ocfs2_alloc_context **meta_ac)
2626 {
2627 int ret = 0, num_free_extents;
2628 unsigned int max_recs_needed = clusters_to_add + 2 * extents_to_split;
2629 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2630
2631 *meta_ac = NULL;
2632 if (data_ac)
2633 *data_ac = NULL;
2634
2635 BUG_ON(clusters_to_add != 0 && data_ac == NULL);
2636
2637 num_free_extents = ocfs2_num_free_extents(et);
2638 if (num_free_extents < 0) {
2639 ret = num_free_extents;
2640 mlog_errno(ret);
2641 goto out;
2642 }
2643
2644 /*
2645 * Sparse allocation file systems need to be more conservative
2646 * with reserving room for expansion - the actual allocation
2647 * happens while we've got a journal handle open so re-taking
2648 * a cluster lock (because we ran out of room for another
2649 * extent) will violate ordering rules.
2650 *
2651 * Most of the time we'll only be seeing this 1 cluster at a time
2652 * anyway.
2653 *
2654 * Always lock for any unwritten extents - we might want to
2655 * add blocks during a split.
2656 */
2657 if (!num_free_extents ||
2658 (ocfs2_sparse_alloc(osb) && num_free_extents < max_recs_needed)) {
2659 ret = ocfs2_reserve_new_metadata(osb, et->et_root_el, meta_ac);
2660 if (ret < 0) {
2661 if (ret != -ENOSPC)
2662 mlog_errno(ret);
2663 goto out;
2664 }
2665 }
2666
2667 if (clusters_to_add == 0)
2668 goto out;
2669
2670 ret = ocfs2_reserve_clusters(osb, clusters_to_add, data_ac);
2671 if (ret < 0) {
2672 if (ret != -ENOSPC)
2673 mlog_errno(ret);
2674 goto out;
2675 }
2676
2677 out:
2678 if (ret) {
2679 if (*meta_ac) {
2680 ocfs2_free_alloc_context(*meta_ac);
2681 *meta_ac = NULL;
2682 }
2683
2684 /*
2685 * We cannot have an error and a non null *data_ac.
2686 */
2687 }
2688
2689 return ret;
2690 }
2691
2692 /*
2693 * Read the inode specified by blkno to get suballoc_slot and
2694 * suballoc_bit.
2695 */
2696 static int ocfs2_get_suballoc_slot_bit(struct ocfs2_super *osb, u64 blkno,
2697 u16 *suballoc_slot, u64 *group_blkno,
2698 u16 *suballoc_bit)
2699 {
2700 int status;
2701 struct buffer_head *inode_bh = NULL;
2702 struct ocfs2_dinode *inode_fe;
2703
2704 trace_ocfs2_get_suballoc_slot_bit((unsigned long long)blkno);
2705
2706 /* dirty read disk */
2707 status = ocfs2_read_blocks_sync(osb, blkno, 1, &inode_bh);
2708 if (status < 0) {
2709 mlog(ML_ERROR, "read block %llu failed %d\n",
2710 (unsigned long long)blkno, status);
2711 goto bail;
2712 }
2713
2714 inode_fe = (struct ocfs2_dinode *) inode_bh->b_data;
2715 if (!OCFS2_IS_VALID_DINODE(inode_fe)) {
2716 mlog(ML_ERROR, "invalid inode %llu requested\n",
2717 (unsigned long long)blkno);
2718 status = -EINVAL;
2719 goto bail;
2720 }
2721
2722 if (le16_to_cpu(inode_fe->i_suballoc_slot) != (u16)OCFS2_INVALID_SLOT &&
2723 (u32)le16_to_cpu(inode_fe->i_suballoc_slot) > osb->max_slots - 1) {
2724 mlog(ML_ERROR, "inode %llu has invalid suballoc slot %u\n",
2725 (unsigned long long)blkno,
2726 (u32)le16_to_cpu(inode_fe->i_suballoc_slot));
2727 status = -EINVAL;
2728 goto bail;
2729 }
2730
2731 if (suballoc_slot)
2732 *suballoc_slot = le16_to_cpu(inode_fe->i_suballoc_slot);
2733 if (suballoc_bit)
2734 *suballoc_bit = le16_to_cpu(inode_fe->i_suballoc_bit);
2735 if (group_blkno)
2736 *group_blkno = le64_to_cpu(inode_fe->i_suballoc_loc);
2737
2738 bail:
2739 brelse(inode_bh);
2740
2741 if (status)
2742 mlog_errno(status);
2743 return status;
2744 }
2745
2746 /*
2747 * test whether bit is SET in allocator bitmap or not. on success, 0
2748 * is returned and *res is 1 for SET; 0 otherwise. when fails, errno
2749 * is returned and *res is meaningless. Call this after you have
2750 * cluster locked against suballoc, or you may get a result based on
2751 * non-up2date contents
2752 */
2753 static int ocfs2_test_suballoc_bit(struct ocfs2_super *osb,
2754 struct inode *suballoc,
2755 struct buffer_head *alloc_bh,
2756 u64 group_blkno, u64 blkno,
2757 u16 bit, int *res)
2758 {
2759 struct ocfs2_dinode *alloc_di;
2760 struct ocfs2_group_desc *group;
2761 struct buffer_head *group_bh = NULL;
2762 u64 bg_blkno;
2763 int status;
2764
2765 trace_ocfs2_test_suballoc_bit((unsigned long long)blkno,
2766 (unsigned int)bit);
2767
2768 alloc_di = (struct ocfs2_dinode *)alloc_bh->b_data;
2769 if ((bit + 1) > ocfs2_bits_per_group(&alloc_di->id2.i_chain)) {
2770 mlog(ML_ERROR, "suballoc bit %u out of range of %u\n",
2771 (unsigned int)bit,
2772 ocfs2_bits_per_group(&alloc_di->id2.i_chain));
2773 status = -EINVAL;
2774 goto bail;
2775 }
2776
2777 bg_blkno = group_blkno ? group_blkno :
2778 ocfs2_which_suballoc_group(blkno, bit);
2779 status = ocfs2_read_group_descriptor(suballoc, alloc_di, bg_blkno,
2780 &group_bh);
2781 if (status < 0) {
2782 mlog(ML_ERROR, "read group %llu failed %d\n",
2783 (unsigned long long)bg_blkno, status);
2784 goto bail;
2785 }
2786
2787 group = (struct ocfs2_group_desc *) group_bh->b_data;
2788 *res = ocfs2_test_bit(bit, (unsigned long *)group->bg_bitmap);
2789
2790 bail:
2791 brelse(group_bh);
2792
2793 if (status)
2794 mlog_errno(status);
2795 return status;
2796 }
2797
2798 /*
2799 * Test if the bit representing this inode (blkno) is set in the
2800 * suballocator.
2801 *
2802 * On success, 0 is returned and *res is 1 for SET; 0 otherwise.
2803 *
2804 * In the event of failure, a negative value is returned and *res is
2805 * meaningless.
2806 *
2807 * Callers must make sure to hold nfs_sync_lock to prevent
2808 * ocfs2_delete_inode() on another node from accessing the same
2809 * suballocator concurrently.
2810 */
2811 int ocfs2_test_inode_bit(struct ocfs2_super *osb, u64 blkno, int *res)
2812 {
2813 int status;
2814 u64 group_blkno = 0;
2815 u16 suballoc_bit = 0, suballoc_slot = 0;
2816 struct inode *inode_alloc_inode;
2817 struct buffer_head *alloc_bh = NULL;
2818
2819 trace_ocfs2_test_inode_bit((unsigned long long)blkno);
2820
2821 status = ocfs2_get_suballoc_slot_bit(osb, blkno, &suballoc_slot,
2822 &group_blkno, &suballoc_bit);
2823 if (status < 0) {
2824 mlog(ML_ERROR, "get alloc slot and bit failed %d\n", status);
2825 goto bail;
2826 }
2827
2828 if (suballoc_slot == (u16)OCFS2_INVALID_SLOT)
2829 inode_alloc_inode = ocfs2_get_system_file_inode(osb,
2830 GLOBAL_INODE_ALLOC_SYSTEM_INODE, suballoc_slot);
2831 else
2832 inode_alloc_inode = ocfs2_get_system_file_inode(osb,
2833 INODE_ALLOC_SYSTEM_INODE, suballoc_slot);
2834 if (!inode_alloc_inode) {
2835 /* the error code could be inaccurate, but we are not able to
2836 * get the correct one. */
2837 status = -EINVAL;
2838 mlog(ML_ERROR, "unable to get alloc inode in slot %u\n",
2839 (u32)suballoc_slot);
2840 goto bail;
2841 }
2842
2843 inode_lock(inode_alloc_inode);
2844 status = ocfs2_inode_lock(inode_alloc_inode, &alloc_bh, 0);
2845 if (status < 0) {
2846 inode_unlock(inode_alloc_inode);
2847 iput(inode_alloc_inode);
2848 mlog(ML_ERROR, "lock on alloc inode on slot %u failed %d\n",
2849 (u32)suballoc_slot, status);
2850 goto bail;
2851 }
2852
2853 status = ocfs2_test_suballoc_bit(osb, inode_alloc_inode, alloc_bh,
2854 group_blkno, blkno, suballoc_bit, res);
2855 if (status < 0)
2856 mlog(ML_ERROR, "test suballoc bit failed %d\n", status);
2857
2858 ocfs2_inode_unlock(inode_alloc_inode, 0);
2859 inode_unlock(inode_alloc_inode);
2860
2861 iput(inode_alloc_inode);
2862 brelse(alloc_bh);
2863 bail:
2864 if (status)
2865 mlog_errno(status);
2866 return status;
2867 }
Linux with added FPC-III support