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Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target...
[linux-btrfs-devel.git] / fs / ocfs2 / suballoc.c
blobba5d97e4a73e8a43e64fc3cfa55fb9b97d4ec6a5
1 /* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * suballoc.c
5 *
6 * metadata alloc and free
7 * Inspired by ext3 block groups.
8 *
9 * Copyright (C) 2002, 2004 Oracle. All rights reserved.
10 *
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public
13 * License as published by the Free Software Foundation; either
14 * version 2 of the License, or (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public
22 * License along with this program; if not, write to the
23 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
24 * Boston, MA 021110-1307, USA.
25 */
26
27 #include <linux/fs.h>
28 #include <linux/types.h>
29 #include <linux/slab.h>
30 #include <linux/highmem.h>
31
32 #include <cluster/masklog.h>
33
34 #include "ocfs2.h"
35
36 #include "alloc.h"
37 #include "blockcheck.h"
38 #include "dlmglue.h"
39 #include "inode.h"
40 #include "journal.h"
41 #include "localalloc.h"
42 #include "suballoc.h"
43 #include "super.h"
44 #include "sysfile.h"
45 #include "uptodate.h"
46 #include "ocfs2_trace.h"
47
48 #include "buffer_head_io.h"
49
50 #define NOT_ALLOC_NEW_GROUP 0
51 #define ALLOC_NEW_GROUP 0x1
52 #define ALLOC_GROUPS_FROM_GLOBAL 0x2
53
54 #define OCFS2_MAX_TO_STEAL 1024
55
56 struct ocfs2_suballoc_result {
57 u64 sr_bg_blkno; /* The bg we allocated from. Set
58 to 0 when a block group is
59 contiguous. */
60 u64 sr_bg_stable_blkno; /*
61 * Doesn't change, always
62 * set to target block
63 * group descriptor
64 * block.
65 */
66 u64 sr_blkno; /* The first allocated block */
67 unsigned int sr_bit_offset; /* The bit in the bg */
68 unsigned int sr_bits; /* How many bits we claimed */
69 };
70
71 static u64 ocfs2_group_from_res(struct ocfs2_suballoc_result *res)
72 {
73 if (res->sr_blkno == 0)
74 return 0;
75
76 if (res->sr_bg_blkno)
77 return res->sr_bg_blkno;
78
79 return ocfs2_which_suballoc_group(res->sr_blkno, res->sr_bit_offset);
80 }
81
82 static inline void ocfs2_debug_bg(struct ocfs2_group_desc *bg);
83 static inline void ocfs2_debug_suballoc_inode(struct ocfs2_dinode *fe);
84 static inline u16 ocfs2_find_victim_chain(struct ocfs2_chain_list *cl);
85 static int ocfs2_block_group_fill(handle_t *handle,
86 struct inode *alloc_inode,
87 struct buffer_head *bg_bh,
88 u64 group_blkno,
89 unsigned int group_clusters,
90 u16 my_chain,
91 struct ocfs2_chain_list *cl);
92 static int ocfs2_block_group_alloc(struct ocfs2_super *osb,
93 struct inode *alloc_inode,
94 struct buffer_head *bh,
95 u64 max_block,
96 u64 *last_alloc_group,
97 int flags);
98
99 static int ocfs2_cluster_group_search(struct inode *inode,
100 struct buffer_head *group_bh,
101 u32 bits_wanted, u32 min_bits,
102 u64 max_block,
103 struct ocfs2_suballoc_result *res);
104 static int ocfs2_block_group_search(struct inode *inode,
105 struct buffer_head *group_bh,
106 u32 bits_wanted, u32 min_bits,
107 u64 max_block,
108 struct ocfs2_suballoc_result *res);
109 static int ocfs2_claim_suballoc_bits(struct ocfs2_alloc_context *ac,
110 handle_t *handle,
111 u32 bits_wanted,
112 u32 min_bits,
113 struct ocfs2_suballoc_result *res);
114 static int ocfs2_test_bg_bit_allocatable(struct buffer_head *bg_bh,
115 int nr);
116 static inline int ocfs2_block_group_set_bits(handle_t *handle,
117 struct inode *alloc_inode,
118 struct ocfs2_group_desc *bg,
119 struct buffer_head *group_bh,
120 unsigned int bit_off,
121 unsigned int num_bits);
122 static int ocfs2_relink_block_group(handle_t *handle,
123 struct inode *alloc_inode,
124 struct buffer_head *fe_bh,
125 struct buffer_head *bg_bh,
126 struct buffer_head *prev_bg_bh,
127 u16 chain);
128 static inline int ocfs2_block_group_reasonably_empty(struct ocfs2_group_desc *bg,
129 u32 wanted);
130 static inline u32 ocfs2_desc_bitmap_to_cluster_off(struct inode *inode,
131 u64 bg_blkno,
132 u16 bg_bit_off);
133 static inline void ocfs2_block_to_cluster_group(struct inode *inode,
134 u64 data_blkno,
135 u64 *bg_blkno,
136 u16 *bg_bit_off);
137 static int ocfs2_reserve_clusters_with_limit(struct ocfs2_super *osb,
138 u32 bits_wanted, u64 max_block,
139 int flags,
140 struct ocfs2_alloc_context **ac);
141
142 void ocfs2_free_ac_resource(struct ocfs2_alloc_context *ac)
143 {
144 struct inode *inode = ac->ac_inode;
145
146 if (inode) {
147 if (ac->ac_which != OCFS2_AC_USE_LOCAL)
148 ocfs2_inode_unlock(inode, 1);
149
150 mutex_unlock(&inode->i_mutex);
151
152 iput(inode);
153 ac->ac_inode = NULL;
154 }
155 brelse(ac->ac_bh);
156 ac->ac_bh = NULL;
157 ac->ac_resv = NULL;
158 if (ac->ac_find_loc_priv) {
159 kfree(ac->ac_find_loc_priv);
160 ac->ac_find_loc_priv = NULL;
161 }
162 }
163
164 void ocfs2_free_alloc_context(struct ocfs2_alloc_context *ac)
165 {
166 ocfs2_free_ac_resource(ac);
167 kfree(ac);
168 }
169
170 static u32 ocfs2_bits_per_group(struct ocfs2_chain_list *cl)
171 {
172 return (u32)le16_to_cpu(cl->cl_cpg) * (u32)le16_to_cpu(cl->cl_bpc);
173 }
174
175 #define do_error(fmt, ...) \
176 do{ \
177 if (resize) \
178 mlog(ML_ERROR, fmt "\n", ##__VA_ARGS__); \
179 else \
180 ocfs2_error(sb, fmt, ##__VA_ARGS__); \
181 } while (0)
182
183 static int ocfs2_validate_gd_self(struct super_block *sb,
184 struct buffer_head *bh,
185 int resize)
186 {
187 struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data;
188
189 if (!OCFS2_IS_VALID_GROUP_DESC(gd)) {
190 do_error("Group descriptor #%llu has bad signature %.*s",
191 (unsigned long long)bh->b_blocknr, 7,
192 gd->bg_signature);
193 return -EINVAL;
194 }
195
196 if (le64_to_cpu(gd->bg_blkno) != bh->b_blocknr) {
197 do_error("Group descriptor #%llu has an invalid bg_blkno "
198 "of %llu",
199 (unsigned long long)bh->b_blocknr,
200 (unsigned long long)le64_to_cpu(gd->bg_blkno));
201 return -EINVAL;
202 }
203
204 if (le32_to_cpu(gd->bg_generation) != OCFS2_SB(sb)->fs_generation) {
205 do_error("Group descriptor #%llu has an invalid "
206 "fs_generation of #%u",
207 (unsigned long long)bh->b_blocknr,
208 le32_to_cpu(gd->bg_generation));
209 return -EINVAL;
210 }
211
212 if (le16_to_cpu(gd->bg_free_bits_count) > le16_to_cpu(gd->bg_bits)) {
213 do_error("Group descriptor #%llu has bit count %u but "
214 "claims that %u are free",
215 (unsigned long long)bh->b_blocknr,
216 le16_to_cpu(gd->bg_bits),
217 le16_to_cpu(gd->bg_free_bits_count));
218 return -EINVAL;
219 }
220
221 if (le16_to_cpu(gd->bg_bits) > (8 * le16_to_cpu(gd->bg_size))) {
222 do_error("Group descriptor #%llu has bit count %u but "
223 "max bitmap bits of %u",
224 (unsigned long long)bh->b_blocknr,
225 le16_to_cpu(gd->bg_bits),
226 8 * le16_to_cpu(gd->bg_size));
227 return -EINVAL;
228 }
229
230 return 0;
231 }
232
233 static int ocfs2_validate_gd_parent(struct super_block *sb,
234 struct ocfs2_dinode *di,
235 struct buffer_head *bh,
236 int resize)
237 {
238 unsigned int max_bits;
239 struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data;
240
241 if (di->i_blkno != gd->bg_parent_dinode) {
242 do_error("Group descriptor #%llu has bad parent "
243 "pointer (%llu, expected %llu)",
244 (unsigned long long)bh->b_blocknr,
245 (unsigned long long)le64_to_cpu(gd->bg_parent_dinode),
246 (unsigned long long)le64_to_cpu(di->i_blkno));
247 return -EINVAL;
248 }
249
250 max_bits = le16_to_cpu(di->id2.i_chain.cl_cpg) * le16_to_cpu(di->id2.i_chain.cl_bpc);
251 if (le16_to_cpu(gd->bg_bits) > max_bits) {
252 do_error("Group descriptor #%llu has bit count of %u",
253 (unsigned long long)bh->b_blocknr,
254 le16_to_cpu(gd->bg_bits));
255 return -EINVAL;
256 }
257
258 /* In resize, we may meet the case bg_chain == cl_next_free_rec. */
259 if ((le16_to_cpu(gd->bg_chain) >
260 le16_to_cpu(di->id2.i_chain.cl_next_free_rec)) ||
261 ((le16_to_cpu(gd->bg_chain) ==
262 le16_to_cpu(di->id2.i_chain.cl_next_free_rec)) && !resize)) {
263 do_error("Group descriptor #%llu has bad chain %u",
264 (unsigned long long)bh->b_blocknr,
265 le16_to_cpu(gd->bg_chain));
266 return -EINVAL;
267 }
268
269 return 0;
270 }
271
272 #undef do_error
273
274 /*
275 * This version only prints errors. It does not fail the filesystem, and
276 * exists only for resize.
277 */
278 int ocfs2_check_group_descriptor(struct super_block *sb,
279 struct ocfs2_dinode *di,
280 struct buffer_head *bh)
281 {
282 int rc;
283 struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data;
284
285 BUG_ON(!buffer_uptodate(bh));
286
287 /*
288 * If the ecc fails, we return the error but otherwise
289 * leave the filesystem running. We know any error is
290 * local to this block.
291 */
292 rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &gd->bg_check);
293 if (rc) {
294 mlog(ML_ERROR,
295 "Checksum failed for group descriptor %llu\n",
296 (unsigned long long)bh->b_blocknr);
297 } else
298 rc = ocfs2_validate_gd_self(sb, bh, 1);
299 if (!rc)
300 rc = ocfs2_validate_gd_parent(sb, di, bh, 1);
301
302 return rc;
303 }
304
305 static int ocfs2_validate_group_descriptor(struct super_block *sb,
306 struct buffer_head *bh)
307 {
308 int rc;
309 struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data;
310
311 trace_ocfs2_validate_group_descriptor(
312 (unsigned long long)bh->b_blocknr);
313
314 BUG_ON(!buffer_uptodate(bh));
315
316 /*
317 * If the ecc fails, we return the error but otherwise
318 * leave the filesystem running. We know any error is
319 * local to this block.
320 */
321 rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &gd->bg_check);
322 if (rc)
323 return rc;
324
325 /*
326 * Errors after here are fatal.
327 */
328
329 return ocfs2_validate_gd_self(sb, bh, 0);
330 }
331
332 int ocfs2_read_group_descriptor(struct inode *inode, struct ocfs2_dinode *di,
333 u64 gd_blkno, struct buffer_head **bh)
334 {
335 int rc;
336 struct buffer_head *tmp = *bh;
337
338 rc = ocfs2_read_block(INODE_CACHE(inode), gd_blkno, &tmp,
339 ocfs2_validate_group_descriptor);
340 if (rc)
341 goto out;
342
343 rc = ocfs2_validate_gd_parent(inode->i_sb, di, tmp, 0);
344 if (rc) {
345 brelse(tmp);
346 goto out;
347 }
348
349 /* If ocfs2_read_block() got us a new bh, pass it up. */
350 if (!*bh)
351 *bh = tmp;
352
353 out:
354 return rc;
355 }
356
357 static void ocfs2_bg_discontig_add_extent(struct ocfs2_super *osb,
358 struct ocfs2_group_desc *bg,
359 struct ocfs2_chain_list *cl,
360 u64 p_blkno, unsigned int clusters)
361 {
362 struct ocfs2_extent_list *el = &bg->bg_list;
363 struct ocfs2_extent_rec *rec;
364
365 BUG_ON(!ocfs2_supports_discontig_bg(osb));
366 if (!el->l_next_free_rec)
367 el->l_count = cpu_to_le16(ocfs2_extent_recs_per_gd(osb->sb));
368 rec = &el->l_recs[le16_to_cpu(el->l_next_free_rec)];
369 rec->e_blkno = cpu_to_le64(p_blkno);
370 rec->e_cpos = cpu_to_le32(le16_to_cpu(bg->bg_bits) /
371 le16_to_cpu(cl->cl_bpc));
372 rec->e_leaf_clusters = cpu_to_le16(clusters);
373 le16_add_cpu(&bg->bg_bits, clusters * le16_to_cpu(cl->cl_bpc));
374 le16_add_cpu(&bg->bg_free_bits_count,
375 clusters * le16_to_cpu(cl->cl_bpc));
376 le16_add_cpu(&el->l_next_free_rec, 1);
377 }
378
379 static int ocfs2_block_group_fill(handle_t *handle,
380 struct inode *alloc_inode,
381 struct buffer_head *bg_bh,
382 u64 group_blkno,
383 unsigned int group_clusters,
384 u16 my_chain,
385 struct ocfs2_chain_list *cl)
386 {
387 int status = 0;
388 struct ocfs2_super *osb = OCFS2_SB(alloc_inode->i_sb);
389 struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data;
390 struct super_block * sb = alloc_inode->i_sb;
391
392 if (((unsigned long long) bg_bh->b_blocknr) != group_blkno) {
393 ocfs2_error(alloc_inode->i_sb, "group block (%llu) != "
394 "b_blocknr (%llu)",
395 (unsigned long long)group_blkno,
396 (unsigned long long) bg_bh->b_blocknr);
397 status = -EIO;
398 goto bail;
399 }
400
401 status = ocfs2_journal_access_gd(handle,
402 INODE_CACHE(alloc_inode),
403 bg_bh,
404 OCFS2_JOURNAL_ACCESS_CREATE);
405 if (status < 0) {
406 mlog_errno(status);
407 goto bail;
408 }
409
410 memset(bg, 0, sb->s_blocksize);
411 strcpy(bg->bg_signature, OCFS2_GROUP_DESC_SIGNATURE);
412 bg->bg_generation = cpu_to_le32(OCFS2_SB(sb)->fs_generation);
413 bg->bg_size = cpu_to_le16(ocfs2_group_bitmap_size(sb, 1,
414 osb->s_feature_incompat));
415 bg->bg_chain = cpu_to_le16(my_chain);
416 bg->bg_next_group = cl->cl_recs[my_chain].c_blkno;
417 bg->bg_parent_dinode = cpu_to_le64(OCFS2_I(alloc_inode)->ip_blkno);
418 bg->bg_blkno = cpu_to_le64(group_blkno);
419 if (group_clusters == le16_to_cpu(cl->cl_cpg))
420 bg->bg_bits = cpu_to_le16(ocfs2_bits_per_group(cl));
421 else
422 ocfs2_bg_discontig_add_extent(osb, bg, cl, group_blkno,
423 group_clusters);
424
425 /* set the 1st bit in the bitmap to account for the descriptor block */
426 ocfs2_set_bit(0, (unsigned long *)bg->bg_bitmap);
427 bg->bg_free_bits_count = cpu_to_le16(le16_to_cpu(bg->bg_bits) - 1);
428
429 ocfs2_journal_dirty(handle, bg_bh);
430
431 /* There is no need to zero out or otherwise initialize the
432 * other blocks in a group - All valid FS metadata in a block
433 * group stores the superblock fs_generation value at
434 * allocation time. */
435
436 bail:
437 if (status)
438 mlog_errno(status);
439 return status;
440 }
441
442 static inline u16 ocfs2_find_smallest_chain(struct ocfs2_chain_list *cl)
443 {
444 u16 curr, best;
445
446 best = curr = 0;
447 while (curr < le16_to_cpu(cl->cl_count)) {
448 if (le32_to_cpu(cl->cl_recs[best].c_total) >
449 le32_to_cpu(cl->cl_recs[curr].c_total))
450 best = curr;
451 curr++;
452 }
453 return best;
454 }
455
456 static struct buffer_head *
457 ocfs2_block_group_alloc_contig(struct ocfs2_super *osb, handle_t *handle,
458 struct inode *alloc_inode,
459 struct ocfs2_alloc_context *ac,
460 struct ocfs2_chain_list *cl)
461 {
462 int status;
463 u32 bit_off, num_bits;
464 u64 bg_blkno;
465 struct buffer_head *bg_bh;
466 unsigned int alloc_rec = ocfs2_find_smallest_chain(cl);
467
468 status = ocfs2_claim_clusters(handle, ac,
469 le16_to_cpu(cl->cl_cpg), &bit_off,
470 &num_bits);
471 if (status < 0) {
472 if (status != -ENOSPC)
473 mlog_errno(status);
474 goto bail;
475 }
476
477 /* setup the group */
478 bg_blkno = ocfs2_clusters_to_blocks(osb->sb, bit_off);
479 trace_ocfs2_block_group_alloc_contig(
480 (unsigned long long)bg_blkno, alloc_rec);
481
482 bg_bh = sb_getblk(osb->sb, bg_blkno);
483 if (!bg_bh) {
484 status = -EIO;
485 mlog_errno(status);
486 goto bail;
487 }
488 ocfs2_set_new_buffer_uptodate(INODE_CACHE(alloc_inode), bg_bh);
489
490 status = ocfs2_block_group_fill(handle, alloc_inode, bg_bh,
491 bg_blkno, num_bits, alloc_rec, cl);
492 if (status < 0) {
493 brelse(bg_bh);
494 mlog_errno(status);
495 }
496
497 bail:
498 return status ? ERR_PTR(status) : bg_bh;
499 }
500
501 static int ocfs2_block_group_claim_bits(struct ocfs2_super *osb,
502 handle_t *handle,
503 struct ocfs2_alloc_context *ac,
504 unsigned int min_bits,
505 u32 *bit_off, u32 *num_bits)
506 {
507 int status = 0;
508
509 while (min_bits) {
510 status = ocfs2_claim_clusters(handle, ac, min_bits,
511 bit_off, num_bits);
512 if (status != -ENOSPC)
513 break;
514
515 min_bits >>= 1;
516 }
517
518 return status;
519 }
520
521 static int ocfs2_block_group_grow_discontig(handle_t *handle,
522 struct inode *alloc_inode,
523 struct buffer_head *bg_bh,
524 struct ocfs2_alloc_context *ac,
525 struct ocfs2_chain_list *cl,
526 unsigned int min_bits)
527 {
528 int status;
529 struct ocfs2_super *osb = OCFS2_SB(alloc_inode->i_sb);
530 struct ocfs2_group_desc *bg =
531 (struct ocfs2_group_desc *)bg_bh->b_data;
532 unsigned int needed = le16_to_cpu(cl->cl_cpg) -
533 le16_to_cpu(bg->bg_bits) / le16_to_cpu(cl->cl_bpc);
534 u32 p_cpos, clusters;
535 u64 p_blkno;
536 struct ocfs2_extent_list *el = &bg->bg_list;
537
538 status = ocfs2_journal_access_gd(handle,
539 INODE_CACHE(alloc_inode),
540 bg_bh,
541 OCFS2_JOURNAL_ACCESS_CREATE);
542 if (status < 0) {
543 mlog_errno(status);
544 goto bail;
545 }
546
547 while ((needed > 0) && (le16_to_cpu(el->l_next_free_rec) <
548 le16_to_cpu(el->l_count))) {
549 if (min_bits > needed)
550 min_bits = needed;
551 status = ocfs2_block_group_claim_bits(osb, handle, ac,
552 min_bits, &p_cpos,
553 &clusters);
554 if (status < 0) {
555 if (status != -ENOSPC)
556 mlog_errno(status);
557 goto bail;
558 }
559 p_blkno = ocfs2_clusters_to_blocks(osb->sb, p_cpos);
560 ocfs2_bg_discontig_add_extent(osb, bg, cl, p_blkno,
561 clusters);
562
563 min_bits = clusters;
564 needed = le16_to_cpu(cl->cl_cpg) -
565 le16_to_cpu(bg->bg_bits) / le16_to_cpu(cl->cl_bpc);
566 }
567
568 if (needed > 0) {
569 /*
570 * We have used up all the extent rec but can't fill up
571 * the cpg. So bail out.
572 */
573 status = -ENOSPC;
574 goto bail;
575 }
576
577 ocfs2_journal_dirty(handle, bg_bh);
578
579 bail:
580 return status;
581 }
582
583 static void ocfs2_bg_alloc_cleanup(handle_t *handle,
584 struct ocfs2_alloc_context *cluster_ac,
585 struct inode *alloc_inode,
586 struct buffer_head *bg_bh)
587 {
588 int i, ret;
589 struct ocfs2_group_desc *bg;
590 struct ocfs2_extent_list *el;
591 struct ocfs2_extent_rec *rec;
592
593 if (!bg_bh)
594 return;
595
596 bg = (struct ocfs2_group_desc *)bg_bh->b_data;
597 el = &bg->bg_list;
598 for (i = 0; i < le16_to_cpu(el->l_next_free_rec); i++) {
599 rec = &el->l_recs[i];
600 ret = ocfs2_free_clusters(handle, cluster_ac->ac_inode,
601 cluster_ac->ac_bh,
602 le64_to_cpu(rec->e_blkno),
603 le32_to_cpu(rec->e_leaf_clusters));
604 if (ret)
605 mlog_errno(ret);
606 /* Try all the clusters to free */
607 }
608
609 ocfs2_remove_from_cache(INODE_CACHE(alloc_inode), bg_bh);
610 brelse(bg_bh);
611 }
612
613 static struct buffer_head *
614 ocfs2_block_group_alloc_discontig(handle_t *handle,
615 struct inode *alloc_inode,
616 struct ocfs2_alloc_context *ac,
617 struct ocfs2_chain_list *cl)
618 {
619 int status;
620 u32 bit_off, num_bits;
621 u64 bg_blkno;
622 unsigned int min_bits = le16_to_cpu(cl->cl_cpg) >> 1;
623 struct buffer_head *bg_bh = NULL;
624 unsigned int alloc_rec = ocfs2_find_smallest_chain(cl);
625 struct ocfs2_super *osb = OCFS2_SB(alloc_inode->i_sb);
626
627 if (!ocfs2_supports_discontig_bg(osb)) {
628 status = -ENOSPC;
629 goto bail;
630 }
631
632 status = ocfs2_extend_trans(handle,
633 ocfs2_calc_bg_discontig_credits(osb->sb));
634 if (status) {
635 mlog_errno(status);
636 goto bail;
637 }
638
639 /*
640 * We're going to be grabbing from multiple cluster groups.
641 * We don't have enough credits to relink them all, and the
642 * cluster groups will be staying in cache for the duration of
643 * this operation.
644 */
645 ac->ac_allow_chain_relink = 0;
646
647 /* Claim the first region */
648 status = ocfs2_block_group_claim_bits(osb, handle, ac, min_bits,
649 &bit_off, &num_bits);
650 if (status < 0) {
651 if (status != -ENOSPC)
652 mlog_errno(status);
653 goto bail;
654 }
655 min_bits = num_bits;
656
657 /* setup the group */
658 bg_blkno = ocfs2_clusters_to_blocks(osb->sb, bit_off);
659 trace_ocfs2_block_group_alloc_discontig(
660 (unsigned long long)bg_blkno, alloc_rec);
661
662 bg_bh = sb_getblk(osb->sb, bg_blkno);
663 if (!bg_bh) {
664 status = -EIO;
665 mlog_errno(status);
666 goto bail;
667 }
668 ocfs2_set_new_buffer_uptodate(INODE_CACHE(alloc_inode), bg_bh);
669
670 status = ocfs2_block_group_fill(handle, alloc_inode, bg_bh,
671 bg_blkno, num_bits, alloc_rec, cl);
672 if (status < 0) {
673 mlog_errno(status);
674 goto bail;
675 }
676
677 status = ocfs2_block_group_grow_discontig(handle, alloc_inode,
678 bg_bh, ac, cl, min_bits);
679 if (status)
680 mlog_errno(status);
681
682 bail:
683 if (status)
684 ocfs2_bg_alloc_cleanup(handle, ac, alloc_inode, bg_bh);
685 return status ? ERR_PTR(status) : bg_bh;
686 }
687
688 /*
689 * We expect the block group allocator to already be locked.
690 */
691 static int ocfs2_block_group_alloc(struct ocfs2_super *osb,
692 struct inode *alloc_inode,
693 struct buffer_head *bh,
694 u64 max_block,
695 u64 *last_alloc_group,
696 int flags)
697 {
698 int status, credits;
699 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) bh->b_data;
700 struct ocfs2_chain_list *cl;
701 struct ocfs2_alloc_context *ac = NULL;
702 handle_t *handle = NULL;
703 u16 alloc_rec;
704 struct buffer_head *bg_bh = NULL;
705 struct ocfs2_group_desc *bg;
706
707 BUG_ON(ocfs2_is_cluster_bitmap(alloc_inode));
708
709 cl = &fe->id2.i_chain;
710 status = ocfs2_reserve_clusters_with_limit(osb,
711 le16_to_cpu(cl->cl_cpg),
712 max_block, flags, &ac);
713 if (status < 0) {
714 if (status != -ENOSPC)
715 mlog_errno(status);
716 goto bail;
717 }
718
719 credits = ocfs2_calc_group_alloc_credits(osb->sb,
720 le16_to_cpu(cl->cl_cpg));
721 handle = ocfs2_start_trans(osb, credits);
722 if (IS_ERR(handle)) {
723 status = PTR_ERR(handle);
724 handle = NULL;
725 mlog_errno(status);
726 goto bail;
727 }
728
729 if (last_alloc_group && *last_alloc_group != 0) {
730 trace_ocfs2_block_group_alloc(
731 (unsigned long long)*last_alloc_group);
732 ac->ac_last_group = *last_alloc_group;
733 }
734
735 bg_bh = ocfs2_block_group_alloc_contig(osb, handle, alloc_inode,
736 ac, cl);
737 if (IS_ERR(bg_bh) && (PTR_ERR(bg_bh) == -ENOSPC))
738 bg_bh = ocfs2_block_group_alloc_discontig(handle,
739 alloc_inode,
740 ac, cl);
741 if (IS_ERR(bg_bh)) {
742 status = PTR_ERR(bg_bh);
743 bg_bh = NULL;
744 if (status != -ENOSPC)
745 mlog_errno(status);
746 goto bail;
747 }
748 bg = (struct ocfs2_group_desc *) bg_bh->b_data;
749
750 status = ocfs2_journal_access_di(handle, INODE_CACHE(alloc_inode),
751 bh, OCFS2_JOURNAL_ACCESS_WRITE);
752 if (status < 0) {
753 mlog_errno(status);
754 goto bail;
755 }
756
757 alloc_rec = le16_to_cpu(bg->bg_chain);
758 le32_add_cpu(&cl->cl_recs[alloc_rec].c_free,
759 le16_to_cpu(bg->bg_free_bits_count));
760 le32_add_cpu(&cl->cl_recs[alloc_rec].c_total,
761 le16_to_cpu(bg->bg_bits));
762 cl->cl_recs[alloc_rec].c_blkno = bg->bg_blkno;
763 if (le16_to_cpu(cl->cl_next_free_rec) < le16_to_cpu(cl->cl_count))
764 le16_add_cpu(&cl->cl_next_free_rec, 1);
765
766 le32_add_cpu(&fe->id1.bitmap1.i_used, le16_to_cpu(bg->bg_bits) -
767 le16_to_cpu(bg->bg_free_bits_count));
768 le32_add_cpu(&fe->id1.bitmap1.i_total, le16_to_cpu(bg->bg_bits));
769 le32_add_cpu(&fe->i_clusters, le16_to_cpu(cl->cl_cpg));
770
771 ocfs2_journal_dirty(handle, bh);
772
773 spin_lock(&OCFS2_I(alloc_inode)->ip_lock);
774 OCFS2_I(alloc_inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
775 fe->i_size = cpu_to_le64(ocfs2_clusters_to_bytes(alloc_inode->i_sb,
776 le32_to_cpu(fe->i_clusters)));
777 spin_unlock(&OCFS2_I(alloc_inode)->ip_lock);
778 i_size_write(alloc_inode, le64_to_cpu(fe->i_size));
779 alloc_inode->i_blocks = ocfs2_inode_sector_count(alloc_inode);
780
781 status = 0;
782
783 /* save the new last alloc group so that the caller can cache it. */
784 if (last_alloc_group)
785 *last_alloc_group = ac->ac_last_group;
786
787 bail:
788 if (handle)
789 ocfs2_commit_trans(osb, handle);
790
791 if (ac)
792 ocfs2_free_alloc_context(ac);
793
794 brelse(bg_bh);
795
796 if (status)
797 mlog_errno(status);
798 return status;
799 }
800
801 static int ocfs2_reserve_suballoc_bits(struct ocfs2_super *osb,
802 struct ocfs2_alloc_context *ac,
803 int type,
804 u32 slot,
805 u64 *last_alloc_group,
806 int flags)
807 {
808 int status;
809 u32 bits_wanted = ac->ac_bits_wanted;
810 struct inode *alloc_inode;
811 struct buffer_head *bh = NULL;
812 struct ocfs2_dinode *fe;
813 u32 free_bits;
814
815 alloc_inode = ocfs2_get_system_file_inode(osb, type, slot);
816 if (!alloc_inode) {
817 mlog_errno(-EINVAL);
818 return -EINVAL;
819 }
820
821 mutex_lock(&alloc_inode->i_mutex);
822
823 status = ocfs2_inode_lock(alloc_inode, &bh, 1);
824 if (status < 0) {
825 mutex_unlock(&alloc_inode->i_mutex);
826 iput(alloc_inode);
827
828 mlog_errno(status);
829 return status;
830 }
831
832 ac->ac_inode = alloc_inode;
833 ac->ac_alloc_slot = slot;
834
835 fe = (struct ocfs2_dinode *) bh->b_data;
836
837 /* The bh was validated by the inode read inside
838 * ocfs2_inode_lock(). Any corruption is a code bug. */
839 BUG_ON(!OCFS2_IS_VALID_DINODE(fe));
840
841 if (!(fe->i_flags & cpu_to_le32(OCFS2_CHAIN_FL))) {
842 ocfs2_error(alloc_inode->i_sb, "Invalid chain allocator %llu",
843 (unsigned long long)le64_to_cpu(fe->i_blkno));
844 status = -EIO;
845 goto bail;
846 }
847
848 free_bits = le32_to_cpu(fe->id1.bitmap1.i_total) -
849 le32_to_cpu(fe->id1.bitmap1.i_used);
850
851 if (bits_wanted > free_bits) {
852 /* cluster bitmap never grows */
853 if (ocfs2_is_cluster_bitmap(alloc_inode)) {
854 trace_ocfs2_reserve_suballoc_bits_nospc(bits_wanted,
855 free_bits);
856 status = -ENOSPC;
857 goto bail;
858 }
859
860 if (!(flags & ALLOC_NEW_GROUP)) {
861 trace_ocfs2_reserve_suballoc_bits_no_new_group(
862 slot, bits_wanted, free_bits);
863 status = -ENOSPC;
864 goto bail;
865 }
866
867 status = ocfs2_block_group_alloc(osb, alloc_inode, bh,
868 ac->ac_max_block,
869 last_alloc_group, flags);
870 if (status < 0) {
871 if (status != -ENOSPC)
872 mlog_errno(status);
873 goto bail;
874 }
875 atomic_inc(&osb->alloc_stats.bg_extends);
876
877 /* You should never ask for this much metadata */
878 BUG_ON(bits_wanted >
879 (le32_to_cpu(fe->id1.bitmap1.i_total)
880 - le32_to_cpu(fe->id1.bitmap1.i_used)));
881 }
882
883 get_bh(bh);
884 ac->ac_bh = bh;
885 bail:
886 brelse(bh);
887
888 if (status)
889 mlog_errno(status);
890 return status;
891 }
892
893 static void ocfs2_init_inode_steal_slot(struct ocfs2_super *osb)
894 {
895 spin_lock(&osb->osb_lock);
896 osb->s_inode_steal_slot = OCFS2_INVALID_SLOT;
897 spin_unlock(&osb->osb_lock);
898 atomic_set(&osb->s_num_inodes_stolen, 0);
899 }
900
901 static void ocfs2_init_meta_steal_slot(struct ocfs2_super *osb)
902 {
903 spin_lock(&osb->osb_lock);
904 osb->s_meta_steal_slot = OCFS2_INVALID_SLOT;
905 spin_unlock(&osb->osb_lock);
906 atomic_set(&osb->s_num_meta_stolen, 0);
907 }
908
909 void ocfs2_init_steal_slots(struct ocfs2_super *osb)
910 {
911 ocfs2_init_inode_steal_slot(osb);
912 ocfs2_init_meta_steal_slot(osb);
913 }
914
915 static void __ocfs2_set_steal_slot(struct ocfs2_super *osb, int slot, int type)
916 {
917 spin_lock(&osb->osb_lock);
918 if (type == INODE_ALLOC_SYSTEM_INODE)
919 osb->s_inode_steal_slot = slot;
920 else if (type == EXTENT_ALLOC_SYSTEM_INODE)
921 osb->s_meta_steal_slot = slot;
922 spin_unlock(&osb->osb_lock);
923 }
924
925 static int __ocfs2_get_steal_slot(struct ocfs2_super *osb, int type)
926 {
927 int slot = OCFS2_INVALID_SLOT;
928
929 spin_lock(&osb->osb_lock);
930 if (type == INODE_ALLOC_SYSTEM_INODE)
931 slot = osb->s_inode_steal_slot;
932 else if (type == EXTENT_ALLOC_SYSTEM_INODE)
933 slot = osb->s_meta_steal_slot;
934 spin_unlock(&osb->osb_lock);
935
936 return slot;
937 }
938
939 static int ocfs2_get_inode_steal_slot(struct ocfs2_super *osb)
940 {
941 return __ocfs2_get_steal_slot(osb, INODE_ALLOC_SYSTEM_INODE);
942 }
943
944 static int ocfs2_get_meta_steal_slot(struct ocfs2_super *osb)
945 {
946 return __ocfs2_get_steal_slot(osb, EXTENT_ALLOC_SYSTEM_INODE);
947 }
948
949 static int ocfs2_steal_resource(struct ocfs2_super *osb,
950 struct ocfs2_alloc_context *ac,
951 int type)
952 {
953 int i, status = -ENOSPC;
954 int slot = __ocfs2_get_steal_slot(osb, type);
955
956 /* Start to steal resource from the first slot after ours. */
957 if (slot == OCFS2_INVALID_SLOT)
958 slot = osb->slot_num + 1;
959
960 for (i = 0; i < osb->max_slots; i++, slot++) {
961 if (slot == osb->max_slots)
962 slot = 0;
963
964 if (slot == osb->slot_num)
965 continue;
966
967 status = ocfs2_reserve_suballoc_bits(osb, ac,
968 type,
969 (u32)slot, NULL,
970 NOT_ALLOC_NEW_GROUP);
971 if (status >= 0) {
972 __ocfs2_set_steal_slot(osb, slot, type);
973 break;
974 }
975
976 ocfs2_free_ac_resource(ac);
977 }
978
979 return status;
980 }
981
982 static int ocfs2_steal_inode(struct ocfs2_super *osb,
983 struct ocfs2_alloc_context *ac)
984 {
985 return ocfs2_steal_resource(osb, ac, INODE_ALLOC_SYSTEM_INODE);
986 }
987
988 static int ocfs2_steal_meta(struct ocfs2_super *osb,
989 struct ocfs2_alloc_context *ac)
990 {
991 return ocfs2_steal_resource(osb, ac, EXTENT_ALLOC_SYSTEM_INODE);
992 }
993
994 int ocfs2_reserve_new_metadata_blocks(struct ocfs2_super *osb,
995 int blocks,
996 struct ocfs2_alloc_context **ac)
997 {
998 int status;
999 int slot = ocfs2_get_meta_steal_slot(osb);
1000
1001 *ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
1002 if (!(*ac)) {
1003 status = -ENOMEM;
1004 mlog_errno(status);
1005 goto bail;
1006 }
1007
1008 (*ac)->ac_bits_wanted = blocks;
1009 (*ac)->ac_which = OCFS2_AC_USE_META;
1010 (*ac)->ac_group_search = ocfs2_block_group_search;
1011
1012 if (slot != OCFS2_INVALID_SLOT &&
1013 atomic_read(&osb->s_num_meta_stolen) < OCFS2_MAX_TO_STEAL)
1014 goto extent_steal;
1015
1016 atomic_set(&osb->s_num_meta_stolen, 0);
1017 status = ocfs2_reserve_suballoc_bits(osb, (*ac),
1018 EXTENT_ALLOC_SYSTEM_INODE,
1019 (u32)osb->slot_num, NULL,
1020 ALLOC_GROUPS_FROM_GLOBAL|ALLOC_NEW_GROUP);
1021
1022
1023 if (status >= 0) {
1024 status = 0;
1025 if (slot != OCFS2_INVALID_SLOT)
1026 ocfs2_init_meta_steal_slot(osb);
1027 goto bail;
1028 } else if (status < 0 && status != -ENOSPC) {
1029 mlog_errno(status);
1030 goto bail;
1031 }
1032
1033 ocfs2_free_ac_resource(*ac);
1034
1035 extent_steal:
1036 status = ocfs2_steal_meta(osb, *ac);
1037 atomic_inc(&osb->s_num_meta_stolen);
1038 if (status < 0) {
1039 if (status != -ENOSPC)
1040 mlog_errno(status);
1041 goto bail;
1042 }
1043
1044 status = 0;
1045 bail:
1046 if ((status < 0) && *ac) {
1047 ocfs2_free_alloc_context(*ac);
1048 *ac = NULL;
1049 }
1050
1051 if (status)
1052 mlog_errno(status);
1053 return status;
1054 }
1055
1056 int ocfs2_reserve_new_metadata(struct ocfs2_super *osb,
1057 struct ocfs2_extent_list *root_el,
1058 struct ocfs2_alloc_context **ac)
1059 {
1060 return ocfs2_reserve_new_metadata_blocks(osb,
1061 ocfs2_extend_meta_needed(root_el),
1062 ac);
1063 }
1064
1065 int ocfs2_reserve_new_inode(struct ocfs2_super *osb,
1066 struct ocfs2_alloc_context **ac)
1067 {
1068 int status;
1069 int slot = ocfs2_get_inode_steal_slot(osb);
1070 u64 alloc_group;
1071
1072 *ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
1073 if (!(*ac)) {
1074 status = -ENOMEM;
1075 mlog_errno(status);
1076 goto bail;
1077 }
1078
1079 (*ac)->ac_bits_wanted = 1;
1080 (*ac)->ac_which = OCFS2_AC_USE_INODE;
1081
1082 (*ac)->ac_group_search = ocfs2_block_group_search;
1083
1084 /*
1085 * stat(2) can't handle i_ino > 32bits, so we tell the
1086 * lower levels not to allocate us a block group past that
1087 * limit. The 'inode64' mount option avoids this behavior.
1088 */
1089 if (!(osb->s_mount_opt & OCFS2_MOUNT_INODE64))
1090 (*ac)->ac_max_block = (u32)~0U;
1091
1092 /*
1093 * slot is set when we successfully steal inode from other nodes.
1094 * It is reset in 3 places:
1095 * 1. when we flush the truncate log
1096 * 2. when we complete local alloc recovery.
1097 * 3. when we successfully allocate from our own slot.
1098 * After it is set, we will go on stealing inodes until we find the
1099 * need to check our slots to see whether there is some space for us.
1100 */
1101 if (slot != OCFS2_INVALID_SLOT &&
1102 atomic_read(&osb->s_num_inodes_stolen) < OCFS2_MAX_TO_STEAL)
1103 goto inode_steal;
1104
1105 atomic_set(&osb->s_num_inodes_stolen, 0);
1106 alloc_group = osb->osb_inode_alloc_group;
1107 status = ocfs2_reserve_suballoc_bits(osb, *ac,
1108 INODE_ALLOC_SYSTEM_INODE,
1109 (u32)osb->slot_num,
1110 &alloc_group,
1111 ALLOC_NEW_GROUP |
1112 ALLOC_GROUPS_FROM_GLOBAL);
1113 if (status >= 0) {
1114 status = 0;
1115
1116 spin_lock(&osb->osb_lock);
1117 osb->osb_inode_alloc_group = alloc_group;
1118 spin_unlock(&osb->osb_lock);
1119 trace_ocfs2_reserve_new_inode_new_group(
1120 (unsigned long long)alloc_group);
1121
1122 /*
1123 * Some inodes must be freed by us, so try to allocate
1124 * from our own next time.
1125 */
1126 if (slot != OCFS2_INVALID_SLOT)
1127 ocfs2_init_inode_steal_slot(osb);
1128 goto bail;
1129 } else if (status < 0 && status != -ENOSPC) {
1130 mlog_errno(status);
1131 goto bail;
1132 }
1133
1134 ocfs2_free_ac_resource(*ac);
1135
1136 inode_steal:
1137 status = ocfs2_steal_inode(osb, *ac);
1138 atomic_inc(&osb->s_num_inodes_stolen);
1139 if (status < 0) {
1140 if (status != -ENOSPC)
1141 mlog_errno(status);
1142 goto bail;
1143 }
1144
1145 status = 0;
1146 bail:
1147 if ((status < 0) && *ac) {
1148 ocfs2_free_alloc_context(*ac);
1149 *ac = NULL;
1150 }
1151
1152 if (status)
1153 mlog_errno(status);
1154 return status;
1155 }
1156
1157 /* local alloc code has to do the same thing, so rather than do this
1158 * twice.. */
1159 int ocfs2_reserve_cluster_bitmap_bits(struct ocfs2_super *osb,
1160 struct ocfs2_alloc_context *ac)
1161 {
1162 int status;
1163
1164 ac->ac_which = OCFS2_AC_USE_MAIN;
1165 ac->ac_group_search = ocfs2_cluster_group_search;
1166
1167 status = ocfs2_reserve_suballoc_bits(osb, ac,
1168 GLOBAL_BITMAP_SYSTEM_INODE,
1169 OCFS2_INVALID_SLOT, NULL,
1170 ALLOC_NEW_GROUP);
1171 if (status < 0 && status != -ENOSPC) {
1172 mlog_errno(status);
1173 goto bail;
1174 }
1175
1176 bail:
1177 return status;
1178 }
1179
1180 /* Callers don't need to care which bitmap (local alloc or main) to
1181 * use so we figure it out for them, but unfortunately this clutters
1182 * things a bit. */
1183 static int ocfs2_reserve_clusters_with_limit(struct ocfs2_super *osb,
1184 u32 bits_wanted, u64 max_block,
1185 int flags,
1186 struct ocfs2_alloc_context **ac)
1187 {
1188 int status;
1189
1190 *ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
1191 if (!(*ac)) {
1192 status = -ENOMEM;
1193 mlog_errno(status);
1194 goto bail;
1195 }
1196
1197 (*ac)->ac_bits_wanted = bits_wanted;
1198 (*ac)->ac_max_block = max_block;
1199
1200 status = -ENOSPC;
1201 if (!(flags & ALLOC_GROUPS_FROM_GLOBAL) &&
1202 ocfs2_alloc_should_use_local(osb, bits_wanted)) {
1203 status = ocfs2_reserve_local_alloc_bits(osb,
1204 bits_wanted,
1205 *ac);
1206 if ((status < 0) && (status != -ENOSPC)) {
1207 mlog_errno(status);
1208 goto bail;
1209 }
1210 }
1211
1212 if (status == -ENOSPC) {
1213 status = ocfs2_reserve_cluster_bitmap_bits(osb, *ac);
1214 if (status < 0) {
1215 if (status != -ENOSPC)
1216 mlog_errno(status);
1217 goto bail;
1218 }
1219 }
1220
1221 status = 0;
1222 bail:
1223 if ((status < 0) && *ac) {
1224 ocfs2_free_alloc_context(*ac);
1225 *ac = NULL;
1226 }
1227
1228 if (status)
1229 mlog_errno(status);
1230 return status;
1231 }
1232
1233 int ocfs2_reserve_clusters(struct ocfs2_super *osb,
1234 u32 bits_wanted,
1235 struct ocfs2_alloc_context **ac)
1236 {
1237 return ocfs2_reserve_clusters_with_limit(osb, bits_wanted, 0,
1238 ALLOC_NEW_GROUP, ac);
1239 }
1240
1241 /*
1242 * More or less lifted from ext3. I'll leave their description below:
1243 *
1244 * "For ext3 allocations, we must not reuse any blocks which are
1245 * allocated in the bitmap buffer's "last committed data" copy. This
1246 * prevents deletes from freeing up the page for reuse until we have
1247 * committed the delete transaction.
1248 *
1249 * If we didn't do this, then deleting something and reallocating it as
1250 * data would allow the old block to be overwritten before the
1251 * transaction committed (because we force data to disk before commit).
1252 * This would lead to corruption if we crashed between overwriting the
1253 * data and committing the delete.
1254 *
1255 * @@@ We may want to make this allocation behaviour conditional on
1256 * data-writes at some point, and disable it for metadata allocations or
1257 * sync-data inodes."
1258 *
1259 * Note: OCFS2 already does this differently for metadata vs data
1260 * allocations, as those bitmaps are separate and undo access is never
1261 * called on a metadata group descriptor.
1262 */
1263 static int ocfs2_test_bg_bit_allocatable(struct buffer_head *bg_bh,
1264 int nr)
1265 {
1266 struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data;
1267 int ret;
1268
1269 if (ocfs2_test_bit(nr, (unsigned long *)bg->bg_bitmap))
1270 return 0;
1271
1272 if (!buffer_jbd(bg_bh))
1273 return 1;
1274
1275 jbd_lock_bh_state(bg_bh);
1276 bg = (struct ocfs2_group_desc *) bh2jh(bg_bh)->b_committed_data;
1277 if (bg)
1278 ret = !ocfs2_test_bit(nr, (unsigned long *)bg->bg_bitmap);
1279 else
1280 ret = 1;
1281 jbd_unlock_bh_state(bg_bh);
1282
1283 return ret;
1284 }
1285
1286 static int ocfs2_block_group_find_clear_bits(struct ocfs2_super *osb,
1287 struct buffer_head *bg_bh,
1288 unsigned int bits_wanted,
1289 unsigned int total_bits,
1290 struct ocfs2_suballoc_result *res)
1291 {
1292 void *bitmap;
1293 u16 best_offset, best_size;
1294 int offset, start, found, status = 0;
1295 struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data;
1296
1297 /* Callers got this descriptor from
1298 * ocfs2_read_group_descriptor(). Any corruption is a code bug. */
1299 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
1300
1301 found = start = best_offset = best_size = 0;
1302 bitmap = bg->bg_bitmap;
1303
1304 while((offset = ocfs2_find_next_zero_bit(bitmap, total_bits, start)) != -1) {
1305 if (offset == total_bits)
1306 break;
1307
1308 if (!ocfs2_test_bg_bit_allocatable(bg_bh, offset)) {
1309 /* We found a zero, but we can't use it as it
1310 * hasn't been put to disk yet! */
1311 found = 0;
1312 start = offset + 1;
1313 } else if (offset == start) {
1314 /* we found a zero */
1315 found++;
1316 /* move start to the next bit to test */
1317 start++;
1318 } else {
1319 /* got a zero after some ones */
1320 found = 1;
1321 start = offset + 1;
1322 }
1323 if (found > best_size) {
1324 best_size = found;
1325 best_offset = start - found;
1326 }
1327 /* we got everything we needed */
1328 if (found == bits_wanted) {
1329 /* mlog(0, "Found it all!\n"); */
1330 break;
1331 }
1332 }
1333
1334 if (best_size) {
1335 res->sr_bit_offset = best_offset;
1336 res->sr_bits = best_size;
1337 } else {
1338 status = -ENOSPC;
1339 /* No error log here -- see the comment above
1340 * ocfs2_test_bg_bit_allocatable */
1341 }
1342
1343 return status;
1344 }
1345
1346 static inline int ocfs2_block_group_set_bits(handle_t *handle,
1347 struct inode *alloc_inode,
1348 struct ocfs2_group_desc *bg,
1349 struct buffer_head *group_bh,
1350 unsigned int bit_off,
1351 unsigned int num_bits)
1352 {
1353 int status;
1354 void *bitmap = bg->bg_bitmap;
1355 int journal_type = OCFS2_JOURNAL_ACCESS_WRITE;
1356
1357 /* All callers get the descriptor via
1358 * ocfs2_read_group_descriptor(). Any corruption is a code bug. */
1359 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
1360 BUG_ON(le16_to_cpu(bg->bg_free_bits_count) < num_bits);
1361
1362 trace_ocfs2_block_group_set_bits(bit_off, num_bits);
1363
1364 if (ocfs2_is_cluster_bitmap(alloc_inode))
1365 journal_type = OCFS2_JOURNAL_ACCESS_UNDO;
1366
1367 status = ocfs2_journal_access_gd(handle,
1368 INODE_CACHE(alloc_inode),
1369 group_bh,
1370 journal_type);
1371 if (status < 0) {
1372 mlog_errno(status);
1373 goto bail;
1374 }
1375
1376 le16_add_cpu(&bg->bg_free_bits_count, -num_bits);
1377 if (le16_to_cpu(bg->bg_free_bits_count) > le16_to_cpu(bg->bg_bits)) {
1378 ocfs2_error(alloc_inode->i_sb, "Group descriptor # %llu has bit"
1379 " count %u but claims %u are freed. num_bits %d",
1380 (unsigned long long)le64_to_cpu(bg->bg_blkno),
1381 le16_to_cpu(bg->bg_bits),
1382 le16_to_cpu(bg->bg_free_bits_count), num_bits);
1383 return -EROFS;
1384 }
1385 while(num_bits--)
1386 ocfs2_set_bit(bit_off++, bitmap);
1387
1388 ocfs2_journal_dirty(handle, group_bh);
1389
1390 bail:
1391 if (status)
1392 mlog_errno(status);
1393 return status;
1394 }
1395
1396 /* find the one with the most empty bits */
1397 static inline u16 ocfs2_find_victim_chain(struct ocfs2_chain_list *cl)
1398 {
1399 u16 curr, best;
1400
1401 BUG_ON(!cl->cl_next_free_rec);
1402
1403 best = curr = 0;
1404 while (curr < le16_to_cpu(cl->cl_next_free_rec)) {
1405 if (le32_to_cpu(cl->cl_recs[curr].c_free) >
1406 le32_to_cpu(cl->cl_recs[best].c_free))
1407 best = curr;
1408 curr++;
1409 }
1410
1411 BUG_ON(best >= le16_to_cpu(cl->cl_next_free_rec));
1412 return best;
1413 }
1414
1415 static int ocfs2_relink_block_group(handle_t *handle,
1416 struct inode *alloc_inode,
1417 struct buffer_head *fe_bh,
1418 struct buffer_head *bg_bh,
1419 struct buffer_head *prev_bg_bh,
1420 u16 chain)
1421 {
1422 int status;
1423 /* there is a really tiny chance the journal calls could fail,
1424 * but we wouldn't want inconsistent blocks in *any* case. */
1425 u64 fe_ptr, bg_ptr, prev_bg_ptr;
1426 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) fe_bh->b_data;
1427 struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data;
1428 struct ocfs2_group_desc *prev_bg = (struct ocfs2_group_desc *) prev_bg_bh->b_data;
1429
1430 /* The caller got these descriptors from
1431 * ocfs2_read_group_descriptor(). Any corruption is a code bug. */
1432 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
1433 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(prev_bg));
1434
1435 trace_ocfs2_relink_block_group(
1436 (unsigned long long)le64_to_cpu(fe->i_blkno), chain,
1437 (unsigned long long)le64_to_cpu(bg->bg_blkno),
1438 (unsigned long long)le64_to_cpu(prev_bg->bg_blkno));
1439
1440 fe_ptr = le64_to_cpu(fe->id2.i_chain.cl_recs[chain].c_blkno);
1441 bg_ptr = le64_to_cpu(bg->bg_next_group);
1442 prev_bg_ptr = le64_to_cpu(prev_bg->bg_next_group);
1443
1444 status = ocfs2_journal_access_gd(handle, INODE_CACHE(alloc_inode),
1445 prev_bg_bh,
1446 OCFS2_JOURNAL_ACCESS_WRITE);
1447 if (status < 0) {
1448 mlog_errno(status);
1449 goto out_rollback;
1450 }
1451
1452 prev_bg->bg_next_group = bg->bg_next_group;
1453 ocfs2_journal_dirty(handle, prev_bg_bh);
1454
1455 status = ocfs2_journal_access_gd(handle, INODE_CACHE(alloc_inode),
1456 bg_bh, OCFS2_JOURNAL_ACCESS_WRITE);
1457 if (status < 0) {
1458 mlog_errno(status);
1459 goto out_rollback;
1460 }
1461
1462 bg->bg_next_group = fe->id2.i_chain.cl_recs[chain].c_blkno;
1463 ocfs2_journal_dirty(handle, bg_bh);
1464
1465 status = ocfs2_journal_access_di(handle, INODE_CACHE(alloc_inode),
1466 fe_bh, OCFS2_JOURNAL_ACCESS_WRITE);
1467 if (status < 0) {
1468 mlog_errno(status);
1469 goto out_rollback;
1470 }
1471
1472 fe->id2.i_chain.cl_recs[chain].c_blkno = bg->bg_blkno;
1473 ocfs2_journal_dirty(handle, fe_bh);
1474
1475 out_rollback:
1476 if (status < 0) {
1477 fe->id2.i_chain.cl_recs[chain].c_blkno = cpu_to_le64(fe_ptr);
1478 bg->bg_next_group = cpu_to_le64(bg_ptr);
1479 prev_bg->bg_next_group = cpu_to_le64(prev_bg_ptr);
1480 }
1481
1482 if (status)
1483 mlog_errno(status);
1484 return status;
1485 }
1486
1487 static inline int ocfs2_block_group_reasonably_empty(struct ocfs2_group_desc *bg,
1488 u32 wanted)
1489 {
1490 return le16_to_cpu(bg->bg_free_bits_count) > wanted;
1491 }
1492
1493 /* return 0 on success, -ENOSPC to keep searching and any other < 0
1494 * value on error. */
1495 static int ocfs2_cluster_group_search(struct inode *inode,
1496 struct buffer_head *group_bh,
1497 u32 bits_wanted, u32 min_bits,
1498 u64 max_block,
1499 struct ocfs2_suballoc_result *res)
1500 {
1501 int search = -ENOSPC;
1502 int ret;
1503 u64 blkoff;
1504 struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *) group_bh->b_data;
1505 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1506 unsigned int max_bits, gd_cluster_off;
1507
1508 BUG_ON(!ocfs2_is_cluster_bitmap(inode));
1509
1510 if (gd->bg_free_bits_count) {
1511 max_bits = le16_to_cpu(gd->bg_bits);
1512
1513 /* Tail groups in cluster bitmaps which aren't cpg
1514 * aligned are prone to partial extension by a failed
1515 * fs resize. If the file system resize never got to
1516 * update the dinode cluster count, then we don't want
1517 * to trust any clusters past it, regardless of what
1518 * the group descriptor says. */
1519 gd_cluster_off = ocfs2_blocks_to_clusters(inode->i_sb,
1520 le64_to_cpu(gd->bg_blkno));
1521 if ((gd_cluster_off + max_bits) >
1522 OCFS2_I(inode)->ip_clusters) {
1523 max_bits = OCFS2_I(inode)->ip_clusters - gd_cluster_off;
1524 trace_ocfs2_cluster_group_search_wrong_max_bits(
1525 (unsigned long long)le64_to_cpu(gd->bg_blkno),
1526 le16_to_cpu(gd->bg_bits),
1527 OCFS2_I(inode)->ip_clusters, max_bits);
1528 }
1529
1530 ret = ocfs2_block_group_find_clear_bits(OCFS2_SB(inode->i_sb),
1531 group_bh, bits_wanted,
1532 max_bits, res);
1533 if (ret)
1534 return ret;
1535
1536 if (max_block) {
1537 blkoff = ocfs2_clusters_to_blocks(inode->i_sb,
1538 gd_cluster_off +
1539 res->sr_bit_offset +
1540 res->sr_bits);
1541 trace_ocfs2_cluster_group_search_max_block(
1542 (unsigned long long)blkoff,
1543 (unsigned long long)max_block);
1544 if (blkoff > max_block)
1545 return -ENOSPC;
1546 }
1547
1548 /* ocfs2_block_group_find_clear_bits() might
1549 * return success, but we still want to return
1550 * -ENOSPC unless it found the minimum number
1551 * of bits. */
1552 if (min_bits <= res->sr_bits)
1553 search = 0; /* success */
1554 else if (res->sr_bits) {
1555 /*
1556 * Don't show bits which we'll be returning
1557 * for allocation to the local alloc bitmap.
1558 */
1559 ocfs2_local_alloc_seen_free_bits(osb, res->sr_bits);
1560 }
1561 }
1562
1563 return search;
1564 }
1565
1566 static int ocfs2_block_group_search(struct inode *inode,
1567 struct buffer_head *group_bh,
1568 u32 bits_wanted, u32 min_bits,
1569 u64 max_block,
1570 struct ocfs2_suballoc_result *res)
1571 {
1572 int ret = -ENOSPC;
1573 u64 blkoff;
1574 struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) group_bh->b_data;
1575
1576 BUG_ON(min_bits != 1);
1577 BUG_ON(ocfs2_is_cluster_bitmap(inode));
1578
1579 if (bg->bg_free_bits_count) {
1580 ret = ocfs2_block_group_find_clear_bits(OCFS2_SB(inode->i_sb),
1581 group_bh, bits_wanted,
1582 le16_to_cpu(bg->bg_bits),
1583 res);
1584 if (!ret && max_block) {
1585 blkoff = le64_to_cpu(bg->bg_blkno) +
1586 res->sr_bit_offset + res->sr_bits;
1587 trace_ocfs2_block_group_search_max_block(
1588 (unsigned long long)blkoff,
1589 (unsigned long long)max_block);
1590 if (blkoff > max_block)
1591 ret = -ENOSPC;
1592 }
1593 }
1594
1595 return ret;
1596 }
1597
1598 static int ocfs2_alloc_dinode_update_counts(struct inode *inode,
1599 handle_t *handle,
1600 struct buffer_head *di_bh,
1601 u32 num_bits,
1602 u16 chain)
1603 {
1604 int ret;
1605 u32 tmp_used;
1606 struct ocfs2_dinode *di = (struct ocfs2_dinode *) di_bh->b_data;
1607 struct ocfs2_chain_list *cl = (struct ocfs2_chain_list *) &di->id2.i_chain;
1608
1609 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
1610 OCFS2_JOURNAL_ACCESS_WRITE);
1611 if (ret < 0) {
1612 mlog_errno(ret);
1613 goto out;
1614 }
1615
1616 tmp_used = le32_to_cpu(di->id1.bitmap1.i_used);
1617 di->id1.bitmap1.i_used = cpu_to_le32(num_bits + tmp_used);
1618 le32_add_cpu(&cl->cl_recs[chain].c_free, -num_bits);
1619 ocfs2_journal_dirty(handle, di_bh);
1620
1621 out:
1622 return ret;
1623 }
1624
1625 static int ocfs2_bg_discontig_fix_by_rec(struct ocfs2_suballoc_result *res,
1626 struct ocfs2_extent_rec *rec,
1627 struct ocfs2_chain_list *cl)
1628 {
1629 unsigned int bpc = le16_to_cpu(cl->cl_bpc);
1630 unsigned int bitoff = le32_to_cpu(rec->e_cpos) * bpc;
1631 unsigned int bitcount = le32_to_cpu(rec->e_leaf_clusters) * bpc;
1632
1633 if (res->sr_bit_offset < bitoff)
1634 return 0;
1635 if (res->sr_bit_offset >= (bitoff + bitcount))
1636 return 0;
1637 res->sr_blkno = le64_to_cpu(rec->e_blkno) +
1638 (res->sr_bit_offset - bitoff);
1639 if ((res->sr_bit_offset + res->sr_bits) > (bitoff + bitcount))
1640 res->sr_bits = (bitoff + bitcount) - res->sr_bit_offset;
1641 return 1;
1642 }
1643
1644 static void ocfs2_bg_discontig_fix_result(struct ocfs2_alloc_context *ac,
1645 struct ocfs2_group_desc *bg,
1646 struct ocfs2_suballoc_result *res)
1647 {
1648 int i;
1649 u64 bg_blkno = res->sr_bg_blkno; /* Save off */
1650 struct ocfs2_extent_rec *rec;
1651 struct ocfs2_dinode *di = (struct ocfs2_dinode *)ac->ac_bh->b_data;
1652 struct ocfs2_chain_list *cl = &di->id2.i_chain;
1653
1654 if (ocfs2_is_cluster_bitmap(ac->ac_inode)) {
1655 res->sr_blkno = 0;
1656 return;
1657 }
1658
1659 res->sr_blkno = res->sr_bg_blkno + res->sr_bit_offset;
1660 res->sr_bg_blkno = 0; /* Clear it for contig block groups */
1661 if (!ocfs2_supports_discontig_bg(OCFS2_SB(ac->ac_inode->i_sb)) ||
1662 !bg->bg_list.l_next_free_rec)
1663 return;
1664
1665 for (i = 0; i < le16_to_cpu(bg->bg_list.l_next_free_rec); i++) {
1666 rec = &bg->bg_list.l_recs[i];
1667 if (ocfs2_bg_discontig_fix_by_rec(res, rec, cl)) {
1668 res->sr_bg_blkno = bg_blkno; /* Restore */
1669 break;
1670 }
1671 }
1672 }
1673
1674 static int ocfs2_search_one_group(struct ocfs2_alloc_context *ac,
1675 handle_t *handle,
1676 u32 bits_wanted,
1677 u32 min_bits,
1678 struct ocfs2_suballoc_result *res,
1679 u16 *bits_left)
1680 {
1681 int ret;
1682 struct buffer_head *group_bh = NULL;
1683 struct ocfs2_group_desc *gd;
1684 struct ocfs2_dinode *di = (struct ocfs2_dinode *)ac->ac_bh->b_data;
1685 struct inode *alloc_inode = ac->ac_inode;
1686
1687 ret = ocfs2_read_group_descriptor(alloc_inode, di,
1688 res->sr_bg_blkno, &group_bh);
1689 if (ret < 0) {
1690 mlog_errno(ret);
1691 return ret;
1692 }
1693
1694 gd = (struct ocfs2_group_desc *) group_bh->b_data;
1695 ret = ac->ac_group_search(alloc_inode, group_bh, bits_wanted, min_bits,
1696 ac->ac_max_block, res);
1697 if (ret < 0) {
1698 if (ret != -ENOSPC)
1699 mlog_errno(ret);
1700 goto out;
1701 }
1702
1703 if (!ret)
1704 ocfs2_bg_discontig_fix_result(ac, gd, res);
1705
1706 /*
1707 * sr_bg_blkno might have been changed by
1708 * ocfs2_bg_discontig_fix_result
1709 */
1710 res->sr_bg_stable_blkno = group_bh->b_blocknr;
1711
1712 if (ac->ac_find_loc_only)
1713 goto out_loc_only;
1714
1715 ret = ocfs2_alloc_dinode_update_counts(alloc_inode, handle, ac->ac_bh,
1716 res->sr_bits,
1717 le16_to_cpu(gd->bg_chain));
1718 if (ret < 0) {
1719 mlog_errno(ret);
1720 goto out;
1721 }
1722
1723 ret = ocfs2_block_group_set_bits(handle, alloc_inode, gd, group_bh,
1724 res->sr_bit_offset, res->sr_bits);
1725 if (ret < 0)
1726 mlog_errno(ret);
1727
1728 out_loc_only:
1729 *bits_left = le16_to_cpu(gd->bg_free_bits_count);
1730
1731 out:
1732 brelse(group_bh);
1733
1734 return ret;
1735 }
1736
1737 static int ocfs2_search_chain(struct ocfs2_alloc_context *ac,
1738 handle_t *handle,
1739 u32 bits_wanted,
1740 u32 min_bits,
1741 struct ocfs2_suballoc_result *res,
1742 u16 *bits_left)
1743 {
1744 int status;
1745 u16 chain;
1746 u64 next_group;
1747 struct inode *alloc_inode = ac->ac_inode;
1748 struct buffer_head *group_bh = NULL;
1749 struct buffer_head *prev_group_bh = NULL;
1750 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) ac->ac_bh->b_data;
1751 struct ocfs2_chain_list *cl = (struct ocfs2_chain_list *) &fe->id2.i_chain;
1752 struct ocfs2_group_desc *bg;
1753
1754 chain = ac->ac_chain;
1755 trace_ocfs2_search_chain_begin(
1756 (unsigned long long)OCFS2_I(alloc_inode)->ip_blkno,
1757 bits_wanted, chain);
1758
1759 status = ocfs2_read_group_descriptor(alloc_inode, fe,
1760 le64_to_cpu(cl->cl_recs[chain].c_blkno),
1761 &group_bh);
1762 if (status < 0) {
1763 mlog_errno(status);
1764 goto bail;
1765 }
1766 bg = (struct ocfs2_group_desc *) group_bh->b_data;
1767
1768 status = -ENOSPC;
1769 /* for now, the chain search is a bit simplistic. We just use
1770 * the 1st group with any empty bits. */
1771 while ((status = ac->ac_group_search(alloc_inode, group_bh,
1772 bits_wanted, min_bits,
1773 ac->ac_max_block,
1774 res)) == -ENOSPC) {
1775 if (!bg->bg_next_group)
1776 break;
1777
1778 brelse(prev_group_bh);
1779 prev_group_bh = NULL;
1780
1781 next_group = le64_to_cpu(bg->bg_next_group);
1782 prev_group_bh = group_bh;
1783 group_bh = NULL;
1784 status = ocfs2_read_group_descriptor(alloc_inode, fe,
1785 next_group, &group_bh);
1786 if (status < 0) {
1787 mlog_errno(status);
1788 goto bail;
1789 }
1790 bg = (struct ocfs2_group_desc *) group_bh->b_data;
1791 }
1792 if (status < 0) {
1793 if (status != -ENOSPC)
1794 mlog_errno(status);
1795 goto bail;
1796 }
1797
1798 trace_ocfs2_search_chain_succ(
1799 (unsigned long long)le64_to_cpu(bg->bg_blkno), res->sr_bits);
1800
1801 res->sr_bg_blkno = le64_to_cpu(bg->bg_blkno);
1802
1803 BUG_ON(res->sr_bits == 0);
1804 if (!status)
1805 ocfs2_bg_discontig_fix_result(ac, bg, res);
1806
1807 /*
1808 * sr_bg_blkno might have been changed by
1809 * ocfs2_bg_discontig_fix_result
1810 */
1811 res->sr_bg_stable_blkno = group_bh->b_blocknr;
1812
1813 /*
1814 * Keep track of previous block descriptor read. When
1815 * we find a target, if we have read more than X
1816 * number of descriptors, and the target is reasonably
1817 * empty, relink him to top of his chain.
1818 *
1819 * We've read 0 extra blocks and only send one more to
1820 * the transaction, yet the next guy to search has a
1821 * much easier time.
1822 *
1823 * Do this *after* figuring out how many bits we're taking out
1824 * of our target group.
1825 */
1826 if (ac->ac_allow_chain_relink &&
1827 (prev_group_bh) &&
1828 (ocfs2_block_group_reasonably_empty(bg, res->sr_bits))) {
1829 status = ocfs2_relink_block_group(handle, alloc_inode,
1830 ac->ac_bh, group_bh,
1831 prev_group_bh, chain);
1832 if (status < 0) {
1833 mlog_errno(status);
1834 goto bail;
1835 }
1836 }
1837
1838 if (ac->ac_find_loc_only)
1839 goto out_loc_only;
1840
1841 status = ocfs2_alloc_dinode_update_counts(alloc_inode, handle,
1842 ac->ac_bh, res->sr_bits,
1843 chain);
1844 if (status) {
1845 mlog_errno(status);
1846 goto bail;
1847 }
1848
1849 status = ocfs2_block_group_set_bits(handle,
1850 alloc_inode,
1851 bg,
1852 group_bh,
1853 res->sr_bit_offset,
1854 res->sr_bits);
1855 if (status < 0) {
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
1864 out_loc_only:
1865 *bits_left = le16_to_cpu(bg->bg_free_bits_count);
1866 bail:
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. */
1876 static 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 ocfs2_error(ac->ac_inode->i_sb,
1902 "Chain allocator dinode %llu has %u used "
1903 "bits but only %u total.",
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 status = -EIO;
1908 goto bail;
1909 }
1910
1911 res->sr_bg_blkno = hint;
1912 if (res->sr_bg_blkno) {
1913 /* Attempt to short-circuit the usual search mechanism
1914 * by jumping straight to the most recently used
1915 * allocation group. This helps us maintain some
1916 * contiguousness across allocations. */
1917 status = ocfs2_search_one_group(ac, handle, bits_wanted,
1918 min_bits, res, &bits_left);
1919 if (!status)
1920 goto set_hint;
1921 if (status < 0 && status != -ENOSPC) {
1922 mlog_errno(status);
1923 goto bail;
1924 }
1925 }
1926
1927 cl = (struct ocfs2_chain_list *) &fe->id2.i_chain;
1928
1929 victim = ocfs2_find_victim_chain(cl);
1930 ac->ac_chain = victim;
1931 ac->ac_allow_chain_relink = 1;
1932
1933 status = ocfs2_search_chain(ac, handle, bits_wanted, min_bits,
1934 res, &bits_left);
1935 if (!status) {
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_allow_chain_relink = 0;
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
1970 set_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
1981 bail:
1982 if (status)
1983 mlog_errno(status);
1984 return status;
1985 }
1986
1987 int 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;
2019 bail:
2020 if (status)
2021 mlog_errno(status);
2022 return status;
2023 }
2024
2025 static 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
2053 static 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
2060 int 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
2111 out:
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
2121 int 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 mlog_errno(ret);
2169 goto out;
2170 }
2171
2172 trace_ocfs2_claim_new_inode_at_loc((unsigned long long)di_blkno,
2173 res->sr_bits);
2174
2175 atomic_inc(&OCFS2_SB(ac->ac_inode->i_sb)->alloc_stats.bg_allocs);
2176
2177 BUG_ON(res->sr_bits != 1);
2178
2179 *suballoc_loc = res->sr_bg_blkno;
2180 *suballoc_bit = res->sr_bit_offset;
2181 ac->ac_bits_given++;
2182 ocfs2_save_inode_ac_group(dir, ac);
2183
2184 out:
2185 brelse(bg_bh);
2186
2187 return ret;
2188 }
2189
2190 int ocfs2_claim_new_inode(handle_t *handle,
2191 struct inode *dir,
2192 struct buffer_head *parent_fe_bh,
2193 struct ocfs2_alloc_context *ac,
2194 u64 *suballoc_loc,
2195 u16 *suballoc_bit,
2196 u64 *fe_blkno)
2197 {
2198 int status;
2199 struct ocfs2_suballoc_result res;
2200
2201 BUG_ON(!ac);
2202 BUG_ON(ac->ac_bits_given != 0);
2203 BUG_ON(ac->ac_bits_wanted != 1);
2204 BUG_ON(ac->ac_which != OCFS2_AC_USE_INODE);
2205
2206 ocfs2_init_inode_ac_group(dir, parent_fe_bh, ac);
2207
2208 status = ocfs2_claim_suballoc_bits(ac,
2209 handle,
2210 1,
2211 1,
2212 &res);
2213 if (status < 0) {
2214 mlog_errno(status);
2215 goto bail;
2216 }
2217 atomic_inc(&OCFS2_SB(ac->ac_inode->i_sb)->alloc_stats.bg_allocs);
2218
2219 BUG_ON(res.sr_bits != 1);
2220
2221 *suballoc_loc = res.sr_bg_blkno;
2222 *suballoc_bit = res.sr_bit_offset;
2223 *fe_blkno = res.sr_blkno;
2224 ac->ac_bits_given++;
2225 ocfs2_save_inode_ac_group(dir, ac);
2226 status = 0;
2227 bail:
2228 if (status)
2229 mlog_errno(status);
2230 return status;
2231 }
2232
2233 /* translate a group desc. blkno and it's bitmap offset into
2234 * disk cluster offset. */
2235 static inline u32 ocfs2_desc_bitmap_to_cluster_off(struct inode *inode,
2236 u64 bg_blkno,
2237 u16 bg_bit_off)
2238 {
2239 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2240 u32 cluster = 0;
2241
2242 BUG_ON(!ocfs2_is_cluster_bitmap(inode));
2243
2244 if (bg_blkno != osb->first_cluster_group_blkno)
2245 cluster = ocfs2_blocks_to_clusters(inode->i_sb, bg_blkno);
2246 cluster += (u32) bg_bit_off;
2247 return cluster;
2248 }
2249
2250 /* given a cluster offset, calculate which block group it belongs to
2251 * and return that block offset. */
2252 u64 ocfs2_which_cluster_group(struct inode *inode, u32 cluster)
2253 {
2254 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2255 u32 group_no;
2256
2257 BUG_ON(!ocfs2_is_cluster_bitmap(inode));
2258
2259 group_no = cluster / osb->bitmap_cpg;
2260 if (!group_no)
2261 return osb->first_cluster_group_blkno;
2262 return ocfs2_clusters_to_blocks(inode->i_sb,
2263 group_no * osb->bitmap_cpg);
2264 }
2265
2266 /* given the block number of a cluster start, calculate which cluster
2267 * group and descriptor bitmap offset that corresponds to. */
2268 static inline void ocfs2_block_to_cluster_group(struct inode *inode,
2269 u64 data_blkno,
2270 u64 *bg_blkno,
2271 u16 *bg_bit_off)
2272 {
2273 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2274 u32 data_cluster = ocfs2_blocks_to_clusters(osb->sb, data_blkno);
2275
2276 BUG_ON(!ocfs2_is_cluster_bitmap(inode));
2277
2278 *bg_blkno = ocfs2_which_cluster_group(inode,
2279 data_cluster);
2280
2281 if (*bg_blkno == osb->first_cluster_group_blkno)
2282 *bg_bit_off = (u16) data_cluster;
2283 else
2284 *bg_bit_off = (u16) ocfs2_blocks_to_clusters(osb->sb,
2285 data_blkno - *bg_blkno);
2286 }
2287
2288 /*
2289 * min_bits - minimum contiguous chunk from this total allocation we
2290 * can handle. set to what we asked for originally for a full
2291 * contig. allocation, set to '1' to indicate we can deal with extents
2292 * of any size.
2293 */
2294 int __ocfs2_claim_clusters(handle_t *handle,
2295 struct ocfs2_alloc_context *ac,
2296 u32 min_clusters,
2297 u32 max_clusters,
2298 u32 *cluster_start,
2299 u32 *num_clusters)
2300 {
2301 int status;
2302 unsigned int bits_wanted = max_clusters;
2303 struct ocfs2_suballoc_result res = { .sr_blkno = 0, };
2304 struct ocfs2_super *osb = OCFS2_SB(ac->ac_inode->i_sb);
2305
2306 BUG_ON(ac->ac_bits_given >= ac->ac_bits_wanted);
2307
2308 BUG_ON(ac->ac_which != OCFS2_AC_USE_LOCAL
2309 && ac->ac_which != OCFS2_AC_USE_MAIN);
2310
2311 if (ac->ac_which == OCFS2_AC_USE_LOCAL) {
2312 WARN_ON(min_clusters > 1);
2313
2314 status = ocfs2_claim_local_alloc_bits(osb,
2315 handle,
2316 ac,
2317 bits_wanted,
2318 cluster_start,
2319 num_clusters);
2320 if (!status)
2321 atomic_inc(&osb->alloc_stats.local_data);
2322 } else {
2323 if (min_clusters > (osb->bitmap_cpg - 1)) {
2324 /* The only paths asking for contiguousness
2325 * should know about this already. */
2326 mlog(ML_ERROR, "minimum allocation requested %u exceeds "
2327 "group bitmap size %u!\n", min_clusters,
2328 osb->bitmap_cpg);
2329 status = -ENOSPC;
2330 goto bail;
2331 }
2332 /* clamp the current request down to a realistic size. */
2333 if (bits_wanted > (osb->bitmap_cpg - 1))
2334 bits_wanted = osb->bitmap_cpg - 1;
2335
2336 status = ocfs2_claim_suballoc_bits(ac,
2337 handle,
2338 bits_wanted,
2339 min_clusters,
2340 &res);
2341 if (!status) {
2342 BUG_ON(res.sr_blkno); /* cluster alloc can't set */
2343 *cluster_start =
2344 ocfs2_desc_bitmap_to_cluster_off(ac->ac_inode,
2345 res.sr_bg_blkno,
2346 res.sr_bit_offset);
2347 atomic_inc(&osb->alloc_stats.bitmap_data);
2348 *num_clusters = res.sr_bits;
2349 }
2350 }
2351 if (status < 0) {
2352 if (status != -ENOSPC)
2353 mlog_errno(status);
2354 goto bail;
2355 }
2356
2357 ac->ac_bits_given += *num_clusters;
2358
2359 bail:
2360 if (status)
2361 mlog_errno(status);
2362 return status;
2363 }
2364
2365 int ocfs2_claim_clusters(handle_t *handle,
2366 struct ocfs2_alloc_context *ac,
2367 u32 min_clusters,
2368 u32 *cluster_start,
2369 u32 *num_clusters)
2370 {
2371 unsigned int bits_wanted = ac->ac_bits_wanted - ac->ac_bits_given;
2372
2373 return __ocfs2_claim_clusters(handle, ac, min_clusters,
2374 bits_wanted, cluster_start, num_clusters);
2375 }
2376
2377 static int ocfs2_block_group_clear_bits(handle_t *handle,
2378 struct inode *alloc_inode,
2379 struct ocfs2_group_desc *bg,
2380 struct buffer_head *group_bh,
2381 unsigned int bit_off,
2382 unsigned int num_bits,
2383 void (*undo_fn)(unsigned int bit,
2384 unsigned long *bmap))
2385 {
2386 int status;
2387 unsigned int tmp;
2388 struct ocfs2_group_desc *undo_bg = NULL;
2389
2390 /* The caller got this descriptor from
2391 * ocfs2_read_group_descriptor(). Any corruption is a code bug. */
2392 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
2393
2394 trace_ocfs2_block_group_clear_bits(bit_off, num_bits);
2395
2396 BUG_ON(undo_fn && !ocfs2_is_cluster_bitmap(alloc_inode));
2397 status = ocfs2_journal_access_gd(handle, INODE_CACHE(alloc_inode),
2398 group_bh,
2399 undo_fn ?
2400 OCFS2_JOURNAL_ACCESS_UNDO :
2401 OCFS2_JOURNAL_ACCESS_WRITE);
2402 if (status < 0) {
2403 mlog_errno(status);
2404 goto bail;
2405 }
2406
2407 if (undo_fn) {
2408 jbd_lock_bh_state(group_bh);
2409 undo_bg = (struct ocfs2_group_desc *)
2410 bh2jh(group_bh)->b_committed_data;
2411 BUG_ON(!undo_bg);
2412 }
2413
2414 tmp = num_bits;
2415 while(tmp--) {
2416 ocfs2_clear_bit((bit_off + tmp),
2417 (unsigned long *) bg->bg_bitmap);
2418 if (undo_fn)
2419 undo_fn(bit_off + tmp,
2420 (unsigned long *) undo_bg->bg_bitmap);
2421 }
2422 le16_add_cpu(&bg->bg_free_bits_count, num_bits);
2423 if (le16_to_cpu(bg->bg_free_bits_count) > le16_to_cpu(bg->bg_bits)) {
2424 ocfs2_error(alloc_inode->i_sb, "Group descriptor # %llu has bit"
2425 " count %u but claims %u are freed. num_bits %d",
2426 (unsigned long long)le64_to_cpu(bg->bg_blkno),
2427 le16_to_cpu(bg->bg_bits),
2428 le16_to_cpu(bg->bg_free_bits_count), num_bits);
2429 return -EROFS;
2430 }
2431
2432 if (undo_fn)
2433 jbd_unlock_bh_state(group_bh);
2434
2435 ocfs2_journal_dirty(handle, group_bh);
2436 bail:
2437 return status;
2438 }
2439
2440 /*
2441 * expects the suballoc inode to already be locked.
2442 */
2443 static int _ocfs2_free_suballoc_bits(handle_t *handle,
2444 struct inode *alloc_inode,
2445 struct buffer_head *alloc_bh,
2446 unsigned int start_bit,
2447 u64 bg_blkno,
2448 unsigned int count,
2449 void (*undo_fn)(unsigned int bit,
2450 unsigned long *bitmap))
2451 {
2452 int status = 0;
2453 u32 tmp_used;
2454 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) alloc_bh->b_data;
2455 struct ocfs2_chain_list *cl = &fe->id2.i_chain;
2456 struct buffer_head *group_bh = NULL;
2457 struct ocfs2_group_desc *group;
2458
2459 /* The alloc_bh comes from ocfs2_free_dinode() or
2460 * ocfs2_free_clusters(). The callers have all locked the
2461 * allocator and gotten alloc_bh from the lock call. This
2462 * validates the dinode buffer. Any corruption that has happened
2463 * is a code bug. */
2464 BUG_ON(!OCFS2_IS_VALID_DINODE(fe));
2465 BUG_ON((count + start_bit) > ocfs2_bits_per_group(cl));
2466
2467 trace_ocfs2_free_suballoc_bits(
2468 (unsigned long long)OCFS2_I(alloc_inode)->ip_blkno,
2469 (unsigned long long)bg_blkno,
2470 start_bit, count);
2471
2472 status = ocfs2_read_group_descriptor(alloc_inode, fe, bg_blkno,
2473 &group_bh);
2474 if (status < 0) {
2475 mlog_errno(status);
2476 goto bail;
2477 }
2478 group = (struct ocfs2_group_desc *) group_bh->b_data;
2479
2480 BUG_ON((count + start_bit) > le16_to_cpu(group->bg_bits));
2481
2482 status = ocfs2_block_group_clear_bits(handle, alloc_inode,
2483 group, group_bh,
2484 start_bit, count, undo_fn);
2485 if (status < 0) {
2486 mlog_errno(status);
2487 goto bail;
2488 }
2489
2490 status = ocfs2_journal_access_di(handle, INODE_CACHE(alloc_inode),
2491 alloc_bh, OCFS2_JOURNAL_ACCESS_WRITE);
2492 if (status < 0) {
2493 mlog_errno(status);
2494 goto bail;
2495 }
2496
2497 le32_add_cpu(&cl->cl_recs[le16_to_cpu(group->bg_chain)].c_free,
2498 count);
2499 tmp_used = le32_to_cpu(fe->id1.bitmap1.i_used);
2500 fe->id1.bitmap1.i_used = cpu_to_le32(tmp_used - count);
2501 ocfs2_journal_dirty(handle, alloc_bh);
2502
2503 bail:
2504 brelse(group_bh);
2505
2506 if (status)
2507 mlog_errno(status);
2508 return status;
2509 }
2510
2511 int ocfs2_free_suballoc_bits(handle_t *handle,
2512 struct inode *alloc_inode,
2513 struct buffer_head *alloc_bh,
2514 unsigned int start_bit,
2515 u64 bg_blkno,
2516 unsigned int count)
2517 {
2518 return _ocfs2_free_suballoc_bits(handle, alloc_inode, alloc_bh,
2519 start_bit, bg_blkno, count, NULL);
2520 }
2521
2522 int ocfs2_free_dinode(handle_t *handle,
2523 struct inode *inode_alloc_inode,
2524 struct buffer_head *inode_alloc_bh,
2525 struct ocfs2_dinode *di)
2526 {
2527 u64 blk = le64_to_cpu(di->i_blkno);
2528 u16 bit = le16_to_cpu(di->i_suballoc_bit);
2529 u64 bg_blkno = ocfs2_which_suballoc_group(blk, bit);
2530
2531 if (di->i_suballoc_loc)
2532 bg_blkno = le64_to_cpu(di->i_suballoc_loc);
2533 return ocfs2_free_suballoc_bits(handle, inode_alloc_inode,
2534 inode_alloc_bh, bit, bg_blkno, 1);
2535 }
2536
2537 static int _ocfs2_free_clusters(handle_t *handle,
2538 struct inode *bitmap_inode,
2539 struct buffer_head *bitmap_bh,
2540 u64 start_blk,
2541 unsigned int num_clusters,
2542 void (*undo_fn)(unsigned int bit,
2543 unsigned long *bitmap))
2544 {
2545 int status;
2546 u16 bg_start_bit;
2547 u64 bg_blkno;
2548 struct ocfs2_dinode *fe;
2549
2550 /* You can't ever have a contiguous set of clusters
2551 * bigger than a block group bitmap so we never have to worry
2552 * about looping on them.
2553 * This is expensive. We can safely remove once this stuff has
2554 * gotten tested really well. */
2555 BUG_ON(start_blk != ocfs2_clusters_to_blocks(bitmap_inode->i_sb, ocfs2_blocks_to_clusters(bitmap_inode->i_sb, start_blk)));
2556
2557 fe = (struct ocfs2_dinode *) bitmap_bh->b_data;
2558
2559 ocfs2_block_to_cluster_group(bitmap_inode, start_blk, &bg_blkno,
2560 &bg_start_bit);
2561
2562 trace_ocfs2_free_clusters((unsigned long long)bg_blkno,
2563 (unsigned long long)start_blk,
2564 bg_start_bit, num_clusters);
2565
2566 status = _ocfs2_free_suballoc_bits(handle, bitmap_inode, bitmap_bh,
2567 bg_start_bit, bg_blkno,
2568 num_clusters, undo_fn);
2569 if (status < 0) {
2570 mlog_errno(status);
2571 goto out;
2572 }
2573
2574 ocfs2_local_alloc_seen_free_bits(OCFS2_SB(bitmap_inode->i_sb),
2575 num_clusters);
2576
2577 out:
2578 if (status)
2579 mlog_errno(status);
2580 return status;
2581 }
2582
2583 int ocfs2_free_clusters(handle_t *handle,
2584 struct inode *bitmap_inode,
2585 struct buffer_head *bitmap_bh,
2586 u64 start_blk,
2587 unsigned int num_clusters)
2588 {
2589 return _ocfs2_free_clusters(handle, bitmap_inode, bitmap_bh,
2590 start_blk, num_clusters,
2591 _ocfs2_set_bit);
2592 }
2593
2594 /*
2595 * Give never-used clusters back to the global bitmap. We don't need
2596 * to protect these bits in the undo buffer.
2597 */
2598 int ocfs2_release_clusters(handle_t *handle,
2599 struct inode *bitmap_inode,
2600 struct buffer_head *bitmap_bh,
2601 u64 start_blk,
2602 unsigned int num_clusters)
2603 {
2604 return _ocfs2_free_clusters(handle, bitmap_inode, bitmap_bh,
2605 start_blk, num_clusters,
2606 _ocfs2_clear_bit);
2607 }
2608
2609 static inline void ocfs2_debug_bg(struct ocfs2_group_desc *bg)
2610 {
2611 printk("Block Group:\n");
2612 printk("bg_signature: %s\n", bg->bg_signature);
2613 printk("bg_size: %u\n", bg->bg_size);
2614 printk("bg_bits: %u\n", bg->bg_bits);
2615 printk("bg_free_bits_count: %u\n", bg->bg_free_bits_count);
2616 printk("bg_chain: %u\n", bg->bg_chain);
2617 printk("bg_generation: %u\n", le32_to_cpu(bg->bg_generation));
2618 printk("bg_next_group: %llu\n",
2619 (unsigned long long)bg->bg_next_group);
2620 printk("bg_parent_dinode: %llu\n",
2621 (unsigned long long)bg->bg_parent_dinode);
2622 printk("bg_blkno: %llu\n",
2623 (unsigned long long)bg->bg_blkno);
2624 }
2625
2626 static inline void ocfs2_debug_suballoc_inode(struct ocfs2_dinode *fe)
2627 {
2628 int i;
2629
2630 printk("Suballoc Inode %llu:\n", (unsigned long long)fe->i_blkno);
2631 printk("i_signature: %s\n", fe->i_signature);
2632 printk("i_size: %llu\n",
2633 (unsigned long long)fe->i_size);
2634 printk("i_clusters: %u\n", fe->i_clusters);
2635 printk("i_generation: %u\n",
2636 le32_to_cpu(fe->i_generation));
2637 printk("id1.bitmap1.i_used: %u\n",
2638 le32_to_cpu(fe->id1.bitmap1.i_used));
2639 printk("id1.bitmap1.i_total: %u\n",
2640 le32_to_cpu(fe->id1.bitmap1.i_total));
2641 printk("id2.i_chain.cl_cpg: %u\n", fe->id2.i_chain.cl_cpg);
2642 printk("id2.i_chain.cl_bpc: %u\n", fe->id2.i_chain.cl_bpc);
2643 printk("id2.i_chain.cl_count: %u\n", fe->id2.i_chain.cl_count);
2644 printk("id2.i_chain.cl_next_free_rec: %u\n",
2645 fe->id2.i_chain.cl_next_free_rec);
2646 for(i = 0; i < fe->id2.i_chain.cl_next_free_rec; i++) {
2647 printk("fe->id2.i_chain.cl_recs[%d].c_free: %u\n", i,
2648 fe->id2.i_chain.cl_recs[i].c_free);
2649 printk("fe->id2.i_chain.cl_recs[%d].c_total: %u\n", i,
2650 fe->id2.i_chain.cl_recs[i].c_total);
2651 printk("fe->id2.i_chain.cl_recs[%d].c_blkno: %llu\n", i,
2652 (unsigned long long)fe->id2.i_chain.cl_recs[i].c_blkno);
2653 }
2654 }
2655
2656 /*
2657 * For a given allocation, determine which allocators will need to be
2658 * accessed, and lock them, reserving the appropriate number of bits.
2659 *
2660 * Sparse file systems call this from ocfs2_write_begin_nolock()
2661 * and ocfs2_allocate_unwritten_extents().
2662 *
2663 * File systems which don't support holes call this from
2664 * ocfs2_extend_allocation().
2665 */
2666 int ocfs2_lock_allocators(struct inode *inode,
2667 struct ocfs2_extent_tree *et,
2668 u32 clusters_to_add, u32 extents_to_split,
2669 struct ocfs2_alloc_context **data_ac,
2670 struct ocfs2_alloc_context **meta_ac)
2671 {
2672 int ret = 0, num_free_extents;
2673 unsigned int max_recs_needed = clusters_to_add + 2 * extents_to_split;
2674 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2675
2676 *meta_ac = NULL;
2677 if (data_ac)
2678 *data_ac = NULL;
2679
2680 BUG_ON(clusters_to_add != 0 && data_ac == NULL);
2681
2682 num_free_extents = ocfs2_num_free_extents(osb, et);
2683 if (num_free_extents < 0) {
2684 ret = num_free_extents;
2685 mlog_errno(ret);
2686 goto out;
2687 }
2688
2689 /*
2690 * Sparse allocation file systems need to be more conservative
2691 * with reserving room for expansion - the actual allocation
2692 * happens while we've got a journal handle open so re-taking
2693 * a cluster lock (because we ran out of room for another
2694 * extent) will violate ordering rules.
2695 *
2696 * Most of the time we'll only be seeing this 1 cluster at a time
2697 * anyway.
2698 *
2699 * Always lock for any unwritten extents - we might want to
2700 * add blocks during a split.
2701 */
2702 if (!num_free_extents ||
2703 (ocfs2_sparse_alloc(osb) && num_free_extents < max_recs_needed)) {
2704 ret = ocfs2_reserve_new_metadata(osb, et->et_root_el, meta_ac);
2705 if (ret < 0) {
2706 if (ret != -ENOSPC)
2707 mlog_errno(ret);
2708 goto out;
2709 }
2710 }
2711
2712 if (clusters_to_add == 0)
2713 goto out;
2714
2715 ret = ocfs2_reserve_clusters(osb, clusters_to_add, data_ac);
2716 if (ret < 0) {
2717 if (ret != -ENOSPC)
2718 mlog_errno(ret);
2719 goto out;
2720 }
2721
2722 out:
2723 if (ret) {
2724 if (*meta_ac) {
2725 ocfs2_free_alloc_context(*meta_ac);
2726 *meta_ac = NULL;
2727 }
2728
2729 /*
2730 * We cannot have an error and a non null *data_ac.
2731 */
2732 }
2733
2734 return ret;
2735 }
2736
2737 /*
2738 * Read the inode specified by blkno to get suballoc_slot and
2739 * suballoc_bit.
2740 */
2741 static int ocfs2_get_suballoc_slot_bit(struct ocfs2_super *osb, u64 blkno,
2742 u16 *suballoc_slot, u64 *group_blkno,
2743 u16 *suballoc_bit)
2744 {
2745 int status;
2746 struct buffer_head *inode_bh = NULL;
2747 struct ocfs2_dinode *inode_fe;
2748
2749 trace_ocfs2_get_suballoc_slot_bit((unsigned long long)blkno);
2750
2751 /* dirty read disk */
2752 status = ocfs2_read_blocks_sync(osb, blkno, 1, &inode_bh);
2753 if (status < 0) {
2754 mlog(ML_ERROR, "read block %llu failed %d\n",
2755 (unsigned long long)blkno, status);
2756 goto bail;
2757 }
2758
2759 inode_fe = (struct ocfs2_dinode *) inode_bh->b_data;
2760 if (!OCFS2_IS_VALID_DINODE(inode_fe)) {
2761 mlog(ML_ERROR, "invalid inode %llu requested\n",
2762 (unsigned long long)blkno);
2763 status = -EINVAL;
2764 goto bail;
2765 }
2766
2767 if (le16_to_cpu(inode_fe->i_suballoc_slot) != (u16)OCFS2_INVALID_SLOT &&
2768 (u32)le16_to_cpu(inode_fe->i_suballoc_slot) > osb->max_slots - 1) {
2769 mlog(ML_ERROR, "inode %llu has invalid suballoc slot %u\n",
2770 (unsigned long long)blkno,
2771 (u32)le16_to_cpu(inode_fe->i_suballoc_slot));
2772 status = -EINVAL;
2773 goto bail;
2774 }
2775
2776 if (suballoc_slot)
2777 *suballoc_slot = le16_to_cpu(inode_fe->i_suballoc_slot);
2778 if (suballoc_bit)
2779 *suballoc_bit = le16_to_cpu(inode_fe->i_suballoc_bit);
2780 if (group_blkno)
2781 *group_blkno = le64_to_cpu(inode_fe->i_suballoc_loc);
2782
2783 bail:
2784 brelse(inode_bh);
2785
2786 if (status)
2787 mlog_errno(status);
2788 return status;
2789 }
2790
2791 /*
2792 * test whether bit is SET in allocator bitmap or not. on success, 0
2793 * is returned and *res is 1 for SET; 0 otherwise. when fails, errno
2794 * is returned and *res is meaningless. Call this after you have
2795 * cluster locked against suballoc, or you may get a result based on
2796 * non-up2date contents
2797 */
2798 static int ocfs2_test_suballoc_bit(struct ocfs2_super *osb,
2799 struct inode *suballoc,
2800 struct buffer_head *alloc_bh,
2801 u64 group_blkno, u64 blkno,
2802 u16 bit, int *res)
2803 {
2804 struct ocfs2_dinode *alloc_di;
2805 struct ocfs2_group_desc *group;
2806 struct buffer_head *group_bh = NULL;
2807 u64 bg_blkno;
2808 int status;
2809
2810 trace_ocfs2_test_suballoc_bit((unsigned long long)blkno,
2811 (unsigned int)bit);
2812
2813 alloc_di = (struct ocfs2_dinode *)alloc_bh->b_data;
2814 if ((bit + 1) > ocfs2_bits_per_group(&alloc_di->id2.i_chain)) {
2815 mlog(ML_ERROR, "suballoc bit %u out of range of %u\n",
2816 (unsigned int)bit,
2817 ocfs2_bits_per_group(&alloc_di->id2.i_chain));
2818 status = -EINVAL;
2819 goto bail;
2820 }
2821
2822 bg_blkno = group_blkno ? group_blkno :
2823 ocfs2_which_suballoc_group(blkno, bit);
2824 status = ocfs2_read_group_descriptor(suballoc, alloc_di, bg_blkno,
2825 &group_bh);
2826 if (status < 0) {
2827 mlog(ML_ERROR, "read group %llu failed %d\n",
2828 (unsigned long long)bg_blkno, status);
2829 goto bail;
2830 }
2831
2832 group = (struct ocfs2_group_desc *) group_bh->b_data;
2833 *res = ocfs2_test_bit(bit, (unsigned long *)group->bg_bitmap);
2834
2835 bail:
2836 brelse(group_bh);
2837
2838 if (status)
2839 mlog_errno(status);
2840 return status;
2841 }
2842
2843 /*
2844 * Test if the bit representing this inode (blkno) is set in the
2845 * suballocator.
2846 *
2847 * On success, 0 is returned and *res is 1 for SET; 0 otherwise.
2848 *
2849 * In the event of failure, a negative value is returned and *res is
2850 * meaningless.
2851 *
2852 * Callers must make sure to hold nfs_sync_lock to prevent
2853 * ocfs2_delete_inode() on another node from accessing the same
2854 * suballocator concurrently.
2855 */
2856 int ocfs2_test_inode_bit(struct ocfs2_super *osb, u64 blkno, int *res)
2857 {
2858 int status;
2859 u64 group_blkno = 0;
2860 u16 suballoc_bit = 0, suballoc_slot = 0;
2861 struct inode *inode_alloc_inode;
2862 struct buffer_head *alloc_bh = NULL;
2863
2864 trace_ocfs2_test_inode_bit((unsigned long long)blkno);
2865
2866 status = ocfs2_get_suballoc_slot_bit(osb, blkno, &suballoc_slot,
2867 &group_blkno, &suballoc_bit);
2868 if (status < 0) {
2869 mlog(ML_ERROR, "get alloc slot and bit failed %d\n", status);
2870 goto bail;
2871 }
2872
2873 inode_alloc_inode =
2874 ocfs2_get_system_file_inode(osb, INODE_ALLOC_SYSTEM_INODE,
2875 suballoc_slot);
2876 if (!inode_alloc_inode) {
2877 /* the error code could be inaccurate, but we are not able to
2878 * get the correct one. */
2879 status = -EINVAL;
2880 mlog(ML_ERROR, "unable to get alloc inode in slot %u\n",
2881 (u32)suballoc_slot);
2882 goto bail;
2883 }
2884
2885 mutex_lock(&inode_alloc_inode->i_mutex);
2886 status = ocfs2_inode_lock(inode_alloc_inode, &alloc_bh, 0);
2887 if (status < 0) {
2888 mutex_unlock(&inode_alloc_inode->i_mutex);
2889 mlog(ML_ERROR, "lock on alloc inode on slot %u failed %d\n",
2890 (u32)suballoc_slot, status);
2891 goto bail;
2892 }
2893
2894 status = ocfs2_test_suballoc_bit(osb, inode_alloc_inode, alloc_bh,
2895 group_blkno, blkno, suballoc_bit, res);
2896 if (status < 0)
2897 mlog(ML_ERROR, "test suballoc bit failed %d\n", status);
2898
2899 ocfs2_inode_unlock(inode_alloc_inode, 0);
2900 mutex_unlock(&inode_alloc_inode->i_mutex);
2901
2902 iput(inode_alloc_inode);
2903 brelse(alloc_bh);
2904 bail:
2905 if (status)
2906 mlog_errno(status);
2907 return status;
2908 }
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