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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6
[linux-2.6/cjktty.git] / fs / ocfs2 / suballoc.c
blob71998d4d61d5caa9f80e0a01d6816729260849c1
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 #define MLOG_MASK_PREFIX ML_DISK_ALLOC
33 #include <cluster/masklog.h>
34
35 #include "ocfs2.h"
36
37 #include "alloc.h"
38 #include "blockcheck.h"
39 #include "dlmglue.h"
40 #include "inode.h"
41 #include "journal.h"
42 #include "localalloc.h"
43 #include "suballoc.h"
44 #include "super.h"
45 #include "sysfile.h"
46 #include "uptodate.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 mlog(0, "Validating group descriptor %llu\n",
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 mlog_entry_void();
393
394 if (((unsigned long long) bg_bh->b_blocknr) != group_blkno) {
395 ocfs2_error(alloc_inode->i_sb, "group block (%llu) != "
396 "b_blocknr (%llu)",
397 (unsigned long long)group_blkno,
398 (unsigned long long) bg_bh->b_blocknr);
399 status = -EIO;
400 goto bail;
401 }
402
403 status = ocfs2_journal_access_gd(handle,
404 INODE_CACHE(alloc_inode),
405 bg_bh,
406 OCFS2_JOURNAL_ACCESS_CREATE);
407 if (status < 0) {
408 mlog_errno(status);
409 goto bail;
410 }
411
412 memset(bg, 0, sb->s_blocksize);
413 strcpy(bg->bg_signature, OCFS2_GROUP_DESC_SIGNATURE);
414 bg->bg_generation = cpu_to_le32(OCFS2_SB(sb)->fs_generation);
415 bg->bg_size = cpu_to_le16(ocfs2_group_bitmap_size(sb, 1,
416 osb->s_feature_incompat));
417 bg->bg_chain = cpu_to_le16(my_chain);
418 bg->bg_next_group = cl->cl_recs[my_chain].c_blkno;
419 bg->bg_parent_dinode = cpu_to_le64(OCFS2_I(alloc_inode)->ip_blkno);
420 bg->bg_blkno = cpu_to_le64(group_blkno);
421 if (group_clusters == le16_to_cpu(cl->cl_cpg))
422 bg->bg_bits = cpu_to_le16(ocfs2_bits_per_group(cl));
423 else
424 ocfs2_bg_discontig_add_extent(osb, bg, cl, group_blkno,
425 group_clusters);
426
427 /* set the 1st bit in the bitmap to account for the descriptor block */
428 ocfs2_set_bit(0, (unsigned long *)bg->bg_bitmap);
429 bg->bg_free_bits_count = cpu_to_le16(le16_to_cpu(bg->bg_bits) - 1);
430
431 ocfs2_journal_dirty(handle, bg_bh);
432
433 /* There is no need to zero out or otherwise initialize the
434 * other blocks in a group - All valid FS metadata in a block
435 * group stores the superblock fs_generation value at
436 * allocation time. */
437
438 bail:
439 mlog_exit(status);
440 return status;
441 }
442
443 static inline u16 ocfs2_find_smallest_chain(struct ocfs2_chain_list *cl)
444 {
445 u16 curr, best;
446
447 best = curr = 0;
448 while (curr < le16_to_cpu(cl->cl_count)) {
449 if (le32_to_cpu(cl->cl_recs[best].c_total) >
450 le32_to_cpu(cl->cl_recs[curr].c_total))
451 best = curr;
452 curr++;
453 }
454 return best;
455 }
456
457 static struct buffer_head *
458 ocfs2_block_group_alloc_contig(struct ocfs2_super *osb, handle_t *handle,
459 struct inode *alloc_inode,
460 struct ocfs2_alloc_context *ac,
461 struct ocfs2_chain_list *cl)
462 {
463 int status;
464 u32 bit_off, num_bits;
465 u64 bg_blkno;
466 struct buffer_head *bg_bh;
467 unsigned int alloc_rec = ocfs2_find_smallest_chain(cl);
468
469 status = ocfs2_claim_clusters(handle, ac,
470 le16_to_cpu(cl->cl_cpg), &bit_off,
471 &num_bits);
472 if (status < 0) {
473 if (status != -ENOSPC)
474 mlog_errno(status);
475 goto bail;
476 }
477
478 /* setup the group */
479 bg_blkno = ocfs2_clusters_to_blocks(osb->sb, bit_off);
480 mlog(0, "new descriptor, record %u, at block %llu\n",
481 alloc_rec, (unsigned long long)bg_blkno);
482
483 bg_bh = sb_getblk(osb->sb, bg_blkno);
484 if (!bg_bh) {
485 status = -EIO;
486 mlog_errno(status);
487 goto bail;
488 }
489 ocfs2_set_new_buffer_uptodate(INODE_CACHE(alloc_inode), bg_bh);
490
491 status = ocfs2_block_group_fill(handle, alloc_inode, bg_bh,
492 bg_blkno, num_bits, alloc_rec, cl);
493 if (status < 0) {
494 brelse(bg_bh);
495 mlog_errno(status);
496 }
497
498 bail:
499 return status ? ERR_PTR(status) : bg_bh;
500 }
501
502 static int ocfs2_block_group_claim_bits(struct ocfs2_super *osb,
503 handle_t *handle,
504 struct ocfs2_alloc_context *ac,
505 unsigned int min_bits,
506 u32 *bit_off, u32 *num_bits)
507 {
508 int status = 0;
509
510 while (min_bits) {
511 status = ocfs2_claim_clusters(handle, ac, min_bits,
512 bit_off, num_bits);
513 if (status != -ENOSPC)
514 break;
515
516 min_bits >>= 1;
517 }
518
519 return status;
520 }
521
522 static int ocfs2_block_group_grow_discontig(handle_t *handle,
523 struct inode *alloc_inode,
524 struct buffer_head *bg_bh,
525 struct ocfs2_alloc_context *ac,
526 struct ocfs2_chain_list *cl,
527 unsigned int min_bits)
528 {
529 int status;
530 struct ocfs2_super *osb = OCFS2_SB(alloc_inode->i_sb);
531 struct ocfs2_group_desc *bg =
532 (struct ocfs2_group_desc *)bg_bh->b_data;
533 unsigned int needed = le16_to_cpu(cl->cl_cpg) -
534 le16_to_cpu(bg->bg_bits) / le16_to_cpu(cl->cl_bpc);
535 u32 p_cpos, clusters;
536 u64 p_blkno;
537 struct ocfs2_extent_list *el = &bg->bg_list;
538
539 status = ocfs2_journal_access_gd(handle,
540 INODE_CACHE(alloc_inode),
541 bg_bh,
542 OCFS2_JOURNAL_ACCESS_CREATE);
543 if (status < 0) {
544 mlog_errno(status);
545 goto bail;
546 }
547
548 while ((needed > 0) && (le16_to_cpu(el->l_next_free_rec) <
549 le16_to_cpu(el->l_count))) {
550 if (min_bits > needed)
551 min_bits = needed;
552 status = ocfs2_block_group_claim_bits(osb, handle, ac,
553 min_bits, &p_cpos,
554 &clusters);
555 if (status < 0) {
556 if (status != -ENOSPC)
557 mlog_errno(status);
558 goto bail;
559 }
560 p_blkno = ocfs2_clusters_to_blocks(osb->sb, p_cpos);
561 ocfs2_bg_discontig_add_extent(osb, bg, cl, p_blkno,
562 clusters);
563
564 min_bits = clusters;
565 needed = le16_to_cpu(cl->cl_cpg) -
566 le16_to_cpu(bg->bg_bits) / le16_to_cpu(cl->cl_bpc);
567 }
568
569 if (needed > 0) {
570 /*
571 * We have used up all the extent rec but can't fill up
572 * the cpg. So bail out.
573 */
574 status = -ENOSPC;
575 goto bail;
576 }
577
578 ocfs2_journal_dirty(handle, bg_bh);
579
580 bail:
581 return status;
582 }
583
584 static void ocfs2_bg_alloc_cleanup(handle_t *handle,
585 struct ocfs2_alloc_context *cluster_ac,
586 struct inode *alloc_inode,
587 struct buffer_head *bg_bh)
588 {
589 int i, ret;
590 struct ocfs2_group_desc *bg;
591 struct ocfs2_extent_list *el;
592 struct ocfs2_extent_rec *rec;
593
594 if (!bg_bh)
595 return;
596
597 bg = (struct ocfs2_group_desc *)bg_bh->b_data;
598 el = &bg->bg_list;
599 for (i = 0; i < le16_to_cpu(el->l_next_free_rec); i++) {
600 rec = &el->l_recs[i];
601 ret = ocfs2_free_clusters(handle, cluster_ac->ac_inode,
602 cluster_ac->ac_bh,
603 le64_to_cpu(rec->e_blkno),
604 le32_to_cpu(rec->e_leaf_clusters));
605 if (ret)
606 mlog_errno(ret);
607 /* Try all the clusters to free */
608 }
609
610 ocfs2_remove_from_cache(INODE_CACHE(alloc_inode), bg_bh);
611 brelse(bg_bh);
612 }
613
614 static struct buffer_head *
615 ocfs2_block_group_alloc_discontig(handle_t *handle,
616 struct inode *alloc_inode,
617 struct ocfs2_alloc_context *ac,
618 struct ocfs2_chain_list *cl)
619 {
620 int status;
621 u32 bit_off, num_bits;
622 u64 bg_blkno;
623 unsigned int min_bits = le16_to_cpu(cl->cl_cpg) >> 1;
624 struct buffer_head *bg_bh = NULL;
625 unsigned int alloc_rec = ocfs2_find_smallest_chain(cl);
626 struct ocfs2_super *osb = OCFS2_SB(alloc_inode->i_sb);
627
628 if (!ocfs2_supports_discontig_bg(osb)) {
629 status = -ENOSPC;
630 goto bail;
631 }
632
633 status = ocfs2_extend_trans(handle,
634 ocfs2_calc_bg_discontig_credits(osb->sb));
635 if (status) {
636 mlog_errno(status);
637 goto bail;
638 }
639
640 /*
641 * We're going to be grabbing from multiple cluster groups.
642 * We don't have enough credits to relink them all, and the
643 * cluster groups will be staying in cache for the duration of
644 * this operation.
645 */
646 ac->ac_allow_chain_relink = 0;
647
648 /* Claim the first region */
649 status = ocfs2_block_group_claim_bits(osb, handle, ac, min_bits,
650 &bit_off, &num_bits);
651 if (status < 0) {
652 if (status != -ENOSPC)
653 mlog_errno(status);
654 goto bail;
655 }
656 min_bits = num_bits;
657
658 /* setup the group */
659 bg_blkno = ocfs2_clusters_to_blocks(osb->sb, bit_off);
660 mlog(0, "new descriptor, record %u, at block %llu\n",
661 alloc_rec, (unsigned long long)bg_blkno);
662
663 bg_bh = sb_getblk(osb->sb, bg_blkno);
664 if (!bg_bh) {
665 status = -EIO;
666 mlog_errno(status);
667 goto bail;
668 }
669 ocfs2_set_new_buffer_uptodate(INODE_CACHE(alloc_inode), bg_bh);
670
671 status = ocfs2_block_group_fill(handle, alloc_inode, bg_bh,
672 bg_blkno, num_bits, alloc_rec, cl);
673 if (status < 0) {
674 mlog_errno(status);
675 goto bail;
676 }
677
678 status = ocfs2_block_group_grow_discontig(handle, alloc_inode,
679 bg_bh, ac, cl, min_bits);
680 if (status)
681 mlog_errno(status);
682
683 bail:
684 if (status)
685 ocfs2_bg_alloc_cleanup(handle, ac, alloc_inode, bg_bh);
686 return status ? ERR_PTR(status) : bg_bh;
687 }
688
689 /*
690 * We expect the block group allocator to already be locked.
691 */
692 static int ocfs2_block_group_alloc(struct ocfs2_super *osb,
693 struct inode *alloc_inode,
694 struct buffer_head *bh,
695 u64 max_block,
696 u64 *last_alloc_group,
697 int flags)
698 {
699 int status, credits;
700 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) bh->b_data;
701 struct ocfs2_chain_list *cl;
702 struct ocfs2_alloc_context *ac = NULL;
703 handle_t *handle = NULL;
704 u16 alloc_rec;
705 struct buffer_head *bg_bh = NULL;
706 struct ocfs2_group_desc *bg;
707
708 BUG_ON(ocfs2_is_cluster_bitmap(alloc_inode));
709
710 mlog_entry_void();
711
712 cl = &fe->id2.i_chain;
713 status = ocfs2_reserve_clusters_with_limit(osb,
714 le16_to_cpu(cl->cl_cpg),
715 max_block, flags, &ac);
716 if (status < 0) {
717 if (status != -ENOSPC)
718 mlog_errno(status);
719 goto bail;
720 }
721
722 credits = ocfs2_calc_group_alloc_credits(osb->sb,
723 le16_to_cpu(cl->cl_cpg));
724 handle = ocfs2_start_trans(osb, credits);
725 if (IS_ERR(handle)) {
726 status = PTR_ERR(handle);
727 handle = NULL;
728 mlog_errno(status);
729 goto bail;
730 }
731
732 if (last_alloc_group && *last_alloc_group != 0) {
733 mlog(0, "use old allocation group %llu for block group alloc\n",
734 (unsigned long long)*last_alloc_group);
735 ac->ac_last_group = *last_alloc_group;
736 }
737
738 bg_bh = ocfs2_block_group_alloc_contig(osb, handle, alloc_inode,
739 ac, cl);
740 if (IS_ERR(bg_bh) && (PTR_ERR(bg_bh) == -ENOSPC))
741 bg_bh = ocfs2_block_group_alloc_discontig(handle,
742 alloc_inode,
743 ac, cl);
744 if (IS_ERR(bg_bh)) {
745 status = PTR_ERR(bg_bh);
746 bg_bh = NULL;
747 if (status != -ENOSPC)
748 mlog_errno(status);
749 goto bail;
750 }
751 bg = (struct ocfs2_group_desc *) bg_bh->b_data;
752
753 status = ocfs2_journal_access_di(handle, INODE_CACHE(alloc_inode),
754 bh, OCFS2_JOURNAL_ACCESS_WRITE);
755 if (status < 0) {
756 mlog_errno(status);
757 goto bail;
758 }
759
760 alloc_rec = le16_to_cpu(bg->bg_chain);
761 le32_add_cpu(&cl->cl_recs[alloc_rec].c_free,
762 le16_to_cpu(bg->bg_free_bits_count));
763 le32_add_cpu(&cl->cl_recs[alloc_rec].c_total,
764 le16_to_cpu(bg->bg_bits));
765 cl->cl_recs[alloc_rec].c_blkno = bg->bg_blkno;
766 if (le16_to_cpu(cl->cl_next_free_rec) < le16_to_cpu(cl->cl_count))
767 le16_add_cpu(&cl->cl_next_free_rec, 1);
768
769 le32_add_cpu(&fe->id1.bitmap1.i_used, le16_to_cpu(bg->bg_bits) -
770 le16_to_cpu(bg->bg_free_bits_count));
771 le32_add_cpu(&fe->id1.bitmap1.i_total, le16_to_cpu(bg->bg_bits));
772 le32_add_cpu(&fe->i_clusters, le16_to_cpu(cl->cl_cpg));
773
774 ocfs2_journal_dirty(handle, bh);
775
776 spin_lock(&OCFS2_I(alloc_inode)->ip_lock);
777 OCFS2_I(alloc_inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
778 fe->i_size = cpu_to_le64(ocfs2_clusters_to_bytes(alloc_inode->i_sb,
779 le32_to_cpu(fe->i_clusters)));
780 spin_unlock(&OCFS2_I(alloc_inode)->ip_lock);
781 i_size_write(alloc_inode, le64_to_cpu(fe->i_size));
782 alloc_inode->i_blocks = ocfs2_inode_sector_count(alloc_inode);
783
784 status = 0;
785
786 /* save the new last alloc group so that the caller can cache it. */
787 if (last_alloc_group)
788 *last_alloc_group = ac->ac_last_group;
789
790 bail:
791 if (handle)
792 ocfs2_commit_trans(osb, handle);
793
794 if (ac)
795 ocfs2_free_alloc_context(ac);
796
797 brelse(bg_bh);
798
799 mlog_exit(status);
800 return status;
801 }
802
803 static int ocfs2_reserve_suballoc_bits(struct ocfs2_super *osb,
804 struct ocfs2_alloc_context *ac,
805 int type,
806 u32 slot,
807 u64 *last_alloc_group,
808 int flags)
809 {
810 int status;
811 u32 bits_wanted = ac->ac_bits_wanted;
812 struct inode *alloc_inode;
813 struct buffer_head *bh = NULL;
814 struct ocfs2_dinode *fe;
815 u32 free_bits;
816
817 mlog_entry_void();
818
819 alloc_inode = ocfs2_get_system_file_inode(osb, type, slot);
820 if (!alloc_inode) {
821 mlog_errno(-EINVAL);
822 return -EINVAL;
823 }
824
825 mutex_lock(&alloc_inode->i_mutex);
826
827 status = ocfs2_inode_lock(alloc_inode, &bh, 1);
828 if (status < 0) {
829 mutex_unlock(&alloc_inode->i_mutex);
830 iput(alloc_inode);
831
832 mlog_errno(status);
833 return status;
834 }
835
836 ac->ac_inode = alloc_inode;
837 ac->ac_alloc_slot = slot;
838
839 fe = (struct ocfs2_dinode *) bh->b_data;
840
841 /* The bh was validated by the inode read inside
842 * ocfs2_inode_lock(). Any corruption is a code bug. */
843 BUG_ON(!OCFS2_IS_VALID_DINODE(fe));
844
845 if (!(fe->i_flags & cpu_to_le32(OCFS2_CHAIN_FL))) {
846 ocfs2_error(alloc_inode->i_sb, "Invalid chain allocator %llu",
847 (unsigned long long)le64_to_cpu(fe->i_blkno));
848 status = -EIO;
849 goto bail;
850 }
851
852 free_bits = le32_to_cpu(fe->id1.bitmap1.i_total) -
853 le32_to_cpu(fe->id1.bitmap1.i_used);
854
855 if (bits_wanted > free_bits) {
856 /* cluster bitmap never grows */
857 if (ocfs2_is_cluster_bitmap(alloc_inode)) {
858 mlog(0, "Disk Full: wanted=%u, free_bits=%u\n",
859 bits_wanted, free_bits);
860 status = -ENOSPC;
861 goto bail;
862 }
863
864 if (!(flags & ALLOC_NEW_GROUP)) {
865 mlog(0, "Alloc File %u Full: wanted=%u, free_bits=%u, "
866 "and we don't alloc a new group for it.\n",
867 slot, bits_wanted, free_bits);
868 status = -ENOSPC;
869 goto bail;
870 }
871
872 status = ocfs2_block_group_alloc(osb, alloc_inode, bh,
873 ac->ac_max_block,
874 last_alloc_group, flags);
875 if (status < 0) {
876 if (status != -ENOSPC)
877 mlog_errno(status);
878 goto bail;
879 }
880 atomic_inc(&osb->alloc_stats.bg_extends);
881
882 /* You should never ask for this much metadata */
883 BUG_ON(bits_wanted >
884 (le32_to_cpu(fe->id1.bitmap1.i_total)
885 - le32_to_cpu(fe->id1.bitmap1.i_used)));
886 }
887
888 get_bh(bh);
889 ac->ac_bh = bh;
890 bail:
891 brelse(bh);
892
893 mlog_exit(status);
894 return status;
895 }
896
897 static void ocfs2_init_inode_steal_slot(struct ocfs2_super *osb)
898 {
899 spin_lock(&osb->osb_lock);
900 osb->s_inode_steal_slot = OCFS2_INVALID_SLOT;
901 spin_unlock(&osb->osb_lock);
902 atomic_set(&osb->s_num_inodes_stolen, 0);
903 }
904
905 static void ocfs2_init_meta_steal_slot(struct ocfs2_super *osb)
906 {
907 spin_lock(&osb->osb_lock);
908 osb->s_meta_steal_slot = OCFS2_INVALID_SLOT;
909 spin_unlock(&osb->osb_lock);
910 atomic_set(&osb->s_num_meta_stolen, 0);
911 }
912
913 void ocfs2_init_steal_slots(struct ocfs2_super *osb)
914 {
915 ocfs2_init_inode_steal_slot(osb);
916 ocfs2_init_meta_steal_slot(osb);
917 }
918
919 static void __ocfs2_set_steal_slot(struct ocfs2_super *osb, int slot, int type)
920 {
921 spin_lock(&osb->osb_lock);
922 if (type == INODE_ALLOC_SYSTEM_INODE)
923 osb->s_inode_steal_slot = slot;
924 else if (type == EXTENT_ALLOC_SYSTEM_INODE)
925 osb->s_meta_steal_slot = slot;
926 spin_unlock(&osb->osb_lock);
927 }
928
929 static int __ocfs2_get_steal_slot(struct ocfs2_super *osb, int type)
930 {
931 int slot = OCFS2_INVALID_SLOT;
932
933 spin_lock(&osb->osb_lock);
934 if (type == INODE_ALLOC_SYSTEM_INODE)
935 slot = osb->s_inode_steal_slot;
936 else if (type == EXTENT_ALLOC_SYSTEM_INODE)
937 slot = osb->s_meta_steal_slot;
938 spin_unlock(&osb->osb_lock);
939
940 return slot;
941 }
942
943 static int ocfs2_get_inode_steal_slot(struct ocfs2_super *osb)
944 {
945 return __ocfs2_get_steal_slot(osb, INODE_ALLOC_SYSTEM_INODE);
946 }
947
948 static int ocfs2_get_meta_steal_slot(struct ocfs2_super *osb)
949 {
950 return __ocfs2_get_steal_slot(osb, EXTENT_ALLOC_SYSTEM_INODE);
951 }
952
953 static int ocfs2_steal_resource(struct ocfs2_super *osb,
954 struct ocfs2_alloc_context *ac,
955 int type)
956 {
957 int i, status = -ENOSPC;
958 int slot = __ocfs2_get_steal_slot(osb, type);
959
960 /* Start to steal resource from the first slot after ours. */
961 if (slot == OCFS2_INVALID_SLOT)
962 slot = osb->slot_num + 1;
963
964 for (i = 0; i < osb->max_slots; i++, slot++) {
965 if (slot == osb->max_slots)
966 slot = 0;
967
968 if (slot == osb->slot_num)
969 continue;
970
971 status = ocfs2_reserve_suballoc_bits(osb, ac,
972 type,
973 (u32)slot, NULL,
974 NOT_ALLOC_NEW_GROUP);
975 if (status >= 0) {
976 __ocfs2_set_steal_slot(osb, slot, type);
977 break;
978 }
979
980 ocfs2_free_ac_resource(ac);
981 }
982
983 return status;
984 }
985
986 static int ocfs2_steal_inode(struct ocfs2_super *osb,
987 struct ocfs2_alloc_context *ac)
988 {
989 return ocfs2_steal_resource(osb, ac, INODE_ALLOC_SYSTEM_INODE);
990 }
991
992 static int ocfs2_steal_meta(struct ocfs2_super *osb,
993 struct ocfs2_alloc_context *ac)
994 {
995 return ocfs2_steal_resource(osb, ac, EXTENT_ALLOC_SYSTEM_INODE);
996 }
997
998 int ocfs2_reserve_new_metadata_blocks(struct ocfs2_super *osb,
999 int blocks,
1000 struct ocfs2_alloc_context **ac)
1001 {
1002 int status;
1003 int slot = ocfs2_get_meta_steal_slot(osb);
1004
1005 *ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
1006 if (!(*ac)) {
1007 status = -ENOMEM;
1008 mlog_errno(status);
1009 goto bail;
1010 }
1011
1012 (*ac)->ac_bits_wanted = blocks;
1013 (*ac)->ac_which = OCFS2_AC_USE_META;
1014 (*ac)->ac_group_search = ocfs2_block_group_search;
1015
1016 if (slot != OCFS2_INVALID_SLOT &&
1017 atomic_read(&osb->s_num_meta_stolen) < OCFS2_MAX_TO_STEAL)
1018 goto extent_steal;
1019
1020 atomic_set(&osb->s_num_meta_stolen, 0);
1021 status = ocfs2_reserve_suballoc_bits(osb, (*ac),
1022 EXTENT_ALLOC_SYSTEM_INODE,
1023 (u32)osb->slot_num, NULL,
1024 ALLOC_GROUPS_FROM_GLOBAL|ALLOC_NEW_GROUP);
1025
1026
1027 if (status >= 0) {
1028 status = 0;
1029 if (slot != OCFS2_INVALID_SLOT)
1030 ocfs2_init_meta_steal_slot(osb);
1031 goto bail;
1032 } else if (status < 0 && status != -ENOSPC) {
1033 mlog_errno(status);
1034 goto bail;
1035 }
1036
1037 ocfs2_free_ac_resource(*ac);
1038
1039 extent_steal:
1040 status = ocfs2_steal_meta(osb, *ac);
1041 atomic_inc(&osb->s_num_meta_stolen);
1042 if (status < 0) {
1043 if (status != -ENOSPC)
1044 mlog_errno(status);
1045 goto bail;
1046 }
1047
1048 status = 0;
1049 bail:
1050 if ((status < 0) && *ac) {
1051 ocfs2_free_alloc_context(*ac);
1052 *ac = NULL;
1053 }
1054
1055 mlog_exit(status);
1056 return status;
1057 }
1058
1059 int ocfs2_reserve_new_metadata(struct ocfs2_super *osb,
1060 struct ocfs2_extent_list *root_el,
1061 struct ocfs2_alloc_context **ac)
1062 {
1063 return ocfs2_reserve_new_metadata_blocks(osb,
1064 ocfs2_extend_meta_needed(root_el),
1065 ac);
1066 }
1067
1068 int ocfs2_reserve_new_inode(struct ocfs2_super *osb,
1069 struct ocfs2_alloc_context **ac)
1070 {
1071 int status;
1072 int slot = ocfs2_get_inode_steal_slot(osb);
1073 u64 alloc_group;
1074
1075 *ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
1076 if (!(*ac)) {
1077 status = -ENOMEM;
1078 mlog_errno(status);
1079 goto bail;
1080 }
1081
1082 (*ac)->ac_bits_wanted = 1;
1083 (*ac)->ac_which = OCFS2_AC_USE_INODE;
1084
1085 (*ac)->ac_group_search = ocfs2_block_group_search;
1086
1087 /*
1088 * stat(2) can't handle i_ino > 32bits, so we tell the
1089 * lower levels not to allocate us a block group past that
1090 * limit. The 'inode64' mount option avoids this behavior.
1091 */
1092 if (!(osb->s_mount_opt & OCFS2_MOUNT_INODE64))
1093 (*ac)->ac_max_block = (u32)~0U;
1094
1095 /*
1096 * slot is set when we successfully steal inode from other nodes.
1097 * It is reset in 3 places:
1098 * 1. when we flush the truncate log
1099 * 2. when we complete local alloc recovery.
1100 * 3. when we successfully allocate from our own slot.
1101 * After it is set, we will go on stealing inodes until we find the
1102 * need to check our slots to see whether there is some space for us.
1103 */
1104 if (slot != OCFS2_INVALID_SLOT &&
1105 atomic_read(&osb->s_num_inodes_stolen) < OCFS2_MAX_TO_STEAL)
1106 goto inode_steal;
1107
1108 atomic_set(&osb->s_num_inodes_stolen, 0);
1109 alloc_group = osb->osb_inode_alloc_group;
1110 status = ocfs2_reserve_suballoc_bits(osb, *ac,
1111 INODE_ALLOC_SYSTEM_INODE,
1112 (u32)osb->slot_num,
1113 &alloc_group,
1114 ALLOC_NEW_GROUP |
1115 ALLOC_GROUPS_FROM_GLOBAL);
1116 if (status >= 0) {
1117 status = 0;
1118
1119 spin_lock(&osb->osb_lock);
1120 osb->osb_inode_alloc_group = alloc_group;
1121 spin_unlock(&osb->osb_lock);
1122 mlog(0, "after reservation, new allocation group is "
1123 "%llu\n", (unsigned long long)alloc_group);
1124
1125 /*
1126 * Some inodes must be freed by us, so try to allocate
1127 * from our own next time.
1128 */
1129 if (slot != OCFS2_INVALID_SLOT)
1130 ocfs2_init_inode_steal_slot(osb);
1131 goto bail;
1132 } else if (status < 0 && status != -ENOSPC) {
1133 mlog_errno(status);
1134 goto bail;
1135 }
1136
1137 ocfs2_free_ac_resource(*ac);
1138
1139 inode_steal:
1140 status = ocfs2_steal_inode(osb, *ac);
1141 atomic_inc(&osb->s_num_inodes_stolen);
1142 if (status < 0) {
1143 if (status != -ENOSPC)
1144 mlog_errno(status);
1145 goto bail;
1146 }
1147
1148 status = 0;
1149 bail:
1150 if ((status < 0) && *ac) {
1151 ocfs2_free_alloc_context(*ac);
1152 *ac = NULL;
1153 }
1154
1155 mlog_exit(status);
1156 return status;
1157 }
1158
1159 /* local alloc code has to do the same thing, so rather than do this
1160 * twice.. */
1161 int ocfs2_reserve_cluster_bitmap_bits(struct ocfs2_super *osb,
1162 struct ocfs2_alloc_context *ac)
1163 {
1164 int status;
1165
1166 ac->ac_which = OCFS2_AC_USE_MAIN;
1167 ac->ac_group_search = ocfs2_cluster_group_search;
1168
1169 status = ocfs2_reserve_suballoc_bits(osb, ac,
1170 GLOBAL_BITMAP_SYSTEM_INODE,
1171 OCFS2_INVALID_SLOT, NULL,
1172 ALLOC_NEW_GROUP);
1173 if (status < 0 && status != -ENOSPC) {
1174 mlog_errno(status);
1175 goto bail;
1176 }
1177
1178 bail:
1179 return status;
1180 }
1181
1182 /* Callers don't need to care which bitmap (local alloc or main) to
1183 * use so we figure it out for them, but unfortunately this clutters
1184 * things a bit. */
1185 static int ocfs2_reserve_clusters_with_limit(struct ocfs2_super *osb,
1186 u32 bits_wanted, u64 max_block,
1187 int flags,
1188 struct ocfs2_alloc_context **ac)
1189 {
1190 int status;
1191
1192 mlog_entry_void();
1193
1194 *ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
1195 if (!(*ac)) {
1196 status = -ENOMEM;
1197 mlog_errno(status);
1198 goto bail;
1199 }
1200
1201 (*ac)->ac_bits_wanted = bits_wanted;
1202 (*ac)->ac_max_block = max_block;
1203
1204 status = -ENOSPC;
1205 if (!(flags & ALLOC_GROUPS_FROM_GLOBAL) &&
1206 ocfs2_alloc_should_use_local(osb, bits_wanted)) {
1207 status = ocfs2_reserve_local_alloc_bits(osb,
1208 bits_wanted,
1209 *ac);
1210 if ((status < 0) && (status != -ENOSPC)) {
1211 mlog_errno(status);
1212 goto bail;
1213 }
1214 }
1215
1216 if (status == -ENOSPC) {
1217 status = ocfs2_reserve_cluster_bitmap_bits(osb, *ac);
1218 if (status < 0) {
1219 if (status != -ENOSPC)
1220 mlog_errno(status);
1221 goto bail;
1222 }
1223 }
1224
1225 status = 0;
1226 bail:
1227 if ((status < 0) && *ac) {
1228 ocfs2_free_alloc_context(*ac);
1229 *ac = NULL;
1230 }
1231
1232 mlog_exit(status);
1233 return status;
1234 }
1235
1236 int ocfs2_reserve_clusters(struct ocfs2_super *osb,
1237 u32 bits_wanted,
1238 struct ocfs2_alloc_context **ac)
1239 {
1240 return ocfs2_reserve_clusters_with_limit(osb, bits_wanted, 0,
1241 ALLOC_NEW_GROUP, ac);
1242 }
1243
1244 /*
1245 * More or less lifted from ext3. I'll leave their description below:
1246 *
1247 * "For ext3 allocations, we must not reuse any blocks which are
1248 * allocated in the bitmap buffer's "last committed data" copy. This
1249 * prevents deletes from freeing up the page for reuse until we have
1250 * committed the delete transaction.
1251 *
1252 * If we didn't do this, then deleting something and reallocating it as
1253 * data would allow the old block to be overwritten before the
1254 * transaction committed (because we force data to disk before commit).
1255 * This would lead to corruption if we crashed between overwriting the
1256 * data and committing the delete.
1257 *
1258 * @@@ We may want to make this allocation behaviour conditional on
1259 * data-writes at some point, and disable it for metadata allocations or
1260 * sync-data inodes."
1261 *
1262 * Note: OCFS2 already does this differently for metadata vs data
1263 * allocations, as those bitmaps are separate and undo access is never
1264 * called on a metadata group descriptor.
1265 */
1266 static int ocfs2_test_bg_bit_allocatable(struct buffer_head *bg_bh,
1267 int nr)
1268 {
1269 struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data;
1270 int ret;
1271
1272 if (ocfs2_test_bit(nr, (unsigned long *)bg->bg_bitmap))
1273 return 0;
1274
1275 if (!buffer_jbd(bg_bh))
1276 return 1;
1277
1278 jbd_lock_bh_state(bg_bh);
1279 bg = (struct ocfs2_group_desc *) bh2jh(bg_bh)->b_committed_data;
1280 if (bg)
1281 ret = !ocfs2_test_bit(nr, (unsigned long *)bg->bg_bitmap);
1282 else
1283 ret = 1;
1284 jbd_unlock_bh_state(bg_bh);
1285
1286 return ret;
1287 }
1288
1289 static int ocfs2_block_group_find_clear_bits(struct ocfs2_super *osb,
1290 struct buffer_head *bg_bh,
1291 unsigned int bits_wanted,
1292 unsigned int total_bits,
1293 struct ocfs2_suballoc_result *res)
1294 {
1295 void *bitmap;
1296 u16 best_offset, best_size;
1297 int offset, start, found, status = 0;
1298 struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data;
1299
1300 /* Callers got this descriptor from
1301 * ocfs2_read_group_descriptor(). Any corruption is a code bug. */
1302 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
1303
1304 found = start = best_offset = best_size = 0;
1305 bitmap = bg->bg_bitmap;
1306
1307 while((offset = ocfs2_find_next_zero_bit(bitmap, total_bits, start)) != -1) {
1308 if (offset == total_bits)
1309 break;
1310
1311 if (!ocfs2_test_bg_bit_allocatable(bg_bh, offset)) {
1312 /* We found a zero, but we can't use it as it
1313 * hasn't been put to disk yet! */
1314 found = 0;
1315 start = offset + 1;
1316 } else if (offset == start) {
1317 /* we found a zero */
1318 found++;
1319 /* move start to the next bit to test */
1320 start++;
1321 } else {
1322 /* got a zero after some ones */
1323 found = 1;
1324 start = offset + 1;
1325 }
1326 if (found > best_size) {
1327 best_size = found;
1328 best_offset = start - found;
1329 }
1330 /* we got everything we needed */
1331 if (found == bits_wanted) {
1332 /* mlog(0, "Found it all!\n"); */
1333 break;
1334 }
1335 }
1336
1337 if (best_size) {
1338 res->sr_bit_offset = best_offset;
1339 res->sr_bits = best_size;
1340 } else {
1341 status = -ENOSPC;
1342 /* No error log here -- see the comment above
1343 * ocfs2_test_bg_bit_allocatable */
1344 }
1345
1346 return status;
1347 }
1348
1349 static inline int ocfs2_block_group_set_bits(handle_t *handle,
1350 struct inode *alloc_inode,
1351 struct ocfs2_group_desc *bg,
1352 struct buffer_head *group_bh,
1353 unsigned int bit_off,
1354 unsigned int num_bits)
1355 {
1356 int status;
1357 void *bitmap = bg->bg_bitmap;
1358 int journal_type = OCFS2_JOURNAL_ACCESS_WRITE;
1359
1360 mlog_entry_void();
1361
1362 /* All callers get the descriptor via
1363 * ocfs2_read_group_descriptor(). Any corruption is a code bug. */
1364 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
1365 BUG_ON(le16_to_cpu(bg->bg_free_bits_count) < num_bits);
1366
1367 mlog(0, "block_group_set_bits: off = %u, num = %u\n", bit_off,
1368 num_bits);
1369
1370 if (ocfs2_is_cluster_bitmap(alloc_inode))
1371 journal_type = OCFS2_JOURNAL_ACCESS_UNDO;
1372
1373 status = ocfs2_journal_access_gd(handle,
1374 INODE_CACHE(alloc_inode),
1375 group_bh,
1376 journal_type);
1377 if (status < 0) {
1378 mlog_errno(status);
1379 goto bail;
1380 }
1381
1382 le16_add_cpu(&bg->bg_free_bits_count, -num_bits);
1383 if (le16_to_cpu(bg->bg_free_bits_count) > le16_to_cpu(bg->bg_bits)) {
1384 ocfs2_error(alloc_inode->i_sb, "Group descriptor # %llu has bit"
1385 " count %u but claims %u are freed. num_bits %d",
1386 (unsigned long long)le64_to_cpu(bg->bg_blkno),
1387 le16_to_cpu(bg->bg_bits),
1388 le16_to_cpu(bg->bg_free_bits_count), num_bits);
1389 return -EROFS;
1390 }
1391 while(num_bits--)
1392 ocfs2_set_bit(bit_off++, bitmap);
1393
1394 ocfs2_journal_dirty(handle, group_bh);
1395
1396 bail:
1397 mlog_exit(status);
1398 return status;
1399 }
1400
1401 /* find the one with the most empty bits */
1402 static inline u16 ocfs2_find_victim_chain(struct ocfs2_chain_list *cl)
1403 {
1404 u16 curr, best;
1405
1406 BUG_ON(!cl->cl_next_free_rec);
1407
1408 best = curr = 0;
1409 while (curr < le16_to_cpu(cl->cl_next_free_rec)) {
1410 if (le32_to_cpu(cl->cl_recs[curr].c_free) >
1411 le32_to_cpu(cl->cl_recs[best].c_free))
1412 best = curr;
1413 curr++;
1414 }
1415
1416 BUG_ON(best >= le16_to_cpu(cl->cl_next_free_rec));
1417 return best;
1418 }
1419
1420 static int ocfs2_relink_block_group(handle_t *handle,
1421 struct inode *alloc_inode,
1422 struct buffer_head *fe_bh,
1423 struct buffer_head *bg_bh,
1424 struct buffer_head *prev_bg_bh,
1425 u16 chain)
1426 {
1427 int status;
1428 /* there is a really tiny chance the journal calls could fail,
1429 * but we wouldn't want inconsistent blocks in *any* case. */
1430 u64 fe_ptr, bg_ptr, prev_bg_ptr;
1431 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) fe_bh->b_data;
1432 struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data;
1433 struct ocfs2_group_desc *prev_bg = (struct ocfs2_group_desc *) prev_bg_bh->b_data;
1434
1435 /* The caller got these descriptors from
1436 * ocfs2_read_group_descriptor(). Any corruption is a code bug. */
1437 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
1438 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(prev_bg));
1439
1440 mlog(0, "Suballoc %llu, chain %u, move group %llu to top, prev = %llu\n",
1441 (unsigned long long)le64_to_cpu(fe->i_blkno), chain,
1442 (unsigned long long)le64_to_cpu(bg->bg_blkno),
1443 (unsigned long long)le64_to_cpu(prev_bg->bg_blkno));
1444
1445 fe_ptr = le64_to_cpu(fe->id2.i_chain.cl_recs[chain].c_blkno);
1446 bg_ptr = le64_to_cpu(bg->bg_next_group);
1447 prev_bg_ptr = le64_to_cpu(prev_bg->bg_next_group);
1448
1449 status = ocfs2_journal_access_gd(handle, INODE_CACHE(alloc_inode),
1450 prev_bg_bh,
1451 OCFS2_JOURNAL_ACCESS_WRITE);
1452 if (status < 0) {
1453 mlog_errno(status);
1454 goto out_rollback;
1455 }
1456
1457 prev_bg->bg_next_group = bg->bg_next_group;
1458 ocfs2_journal_dirty(handle, prev_bg_bh);
1459
1460 status = ocfs2_journal_access_gd(handle, INODE_CACHE(alloc_inode),
1461 bg_bh, OCFS2_JOURNAL_ACCESS_WRITE);
1462 if (status < 0) {
1463 mlog_errno(status);
1464 goto out_rollback;
1465 }
1466
1467 bg->bg_next_group = fe->id2.i_chain.cl_recs[chain].c_blkno;
1468 ocfs2_journal_dirty(handle, bg_bh);
1469
1470 status = ocfs2_journal_access_di(handle, INODE_CACHE(alloc_inode),
1471 fe_bh, OCFS2_JOURNAL_ACCESS_WRITE);
1472 if (status < 0) {
1473 mlog_errno(status);
1474 goto out_rollback;
1475 }
1476
1477 fe->id2.i_chain.cl_recs[chain].c_blkno = bg->bg_blkno;
1478 ocfs2_journal_dirty(handle, fe_bh);
1479
1480 out_rollback:
1481 if (status < 0) {
1482 fe->id2.i_chain.cl_recs[chain].c_blkno = cpu_to_le64(fe_ptr);
1483 bg->bg_next_group = cpu_to_le64(bg_ptr);
1484 prev_bg->bg_next_group = cpu_to_le64(prev_bg_ptr);
1485 }
1486
1487 mlog_exit(status);
1488 return status;
1489 }
1490
1491 static inline int ocfs2_block_group_reasonably_empty(struct ocfs2_group_desc *bg,
1492 u32 wanted)
1493 {
1494 return le16_to_cpu(bg->bg_free_bits_count) > wanted;
1495 }
1496
1497 /* return 0 on success, -ENOSPC to keep searching and any other < 0
1498 * value on error. */
1499 static int ocfs2_cluster_group_search(struct inode *inode,
1500 struct buffer_head *group_bh,
1501 u32 bits_wanted, u32 min_bits,
1502 u64 max_block,
1503 struct ocfs2_suballoc_result *res)
1504 {
1505 int search = -ENOSPC;
1506 int ret;
1507 u64 blkoff;
1508 struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *) group_bh->b_data;
1509 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1510 unsigned int max_bits, gd_cluster_off;
1511
1512 BUG_ON(!ocfs2_is_cluster_bitmap(inode));
1513
1514 if (gd->bg_free_bits_count) {
1515 max_bits = le16_to_cpu(gd->bg_bits);
1516
1517 /* Tail groups in cluster bitmaps which aren't cpg
1518 * aligned are prone to partial extention by a failed
1519 * fs resize. If the file system resize never got to
1520 * update the dinode cluster count, then we don't want
1521 * to trust any clusters past it, regardless of what
1522 * the group descriptor says. */
1523 gd_cluster_off = ocfs2_blocks_to_clusters(inode->i_sb,
1524 le64_to_cpu(gd->bg_blkno));
1525 if ((gd_cluster_off + max_bits) >
1526 OCFS2_I(inode)->ip_clusters) {
1527 max_bits = OCFS2_I(inode)->ip_clusters - gd_cluster_off;
1528 mlog(0, "Desc %llu, bg_bits %u, clusters %u, use %u\n",
1529 (unsigned long long)le64_to_cpu(gd->bg_blkno),
1530 le16_to_cpu(gd->bg_bits),
1531 OCFS2_I(inode)->ip_clusters, max_bits);
1532 }
1533
1534 ret = ocfs2_block_group_find_clear_bits(OCFS2_SB(inode->i_sb),
1535 group_bh, bits_wanted,
1536 max_bits, res);
1537 if (ret)
1538 return ret;
1539
1540 if (max_block) {
1541 blkoff = ocfs2_clusters_to_blocks(inode->i_sb,
1542 gd_cluster_off +
1543 res->sr_bit_offset +
1544 res->sr_bits);
1545 mlog(0, "Checking %llu against %llu\n",
1546 (unsigned long long)blkoff,
1547 (unsigned long long)max_block);
1548 if (blkoff > max_block)
1549 return -ENOSPC;
1550 }
1551
1552 /* ocfs2_block_group_find_clear_bits() might
1553 * return success, but we still want to return
1554 * -ENOSPC unless it found the minimum number
1555 * of bits. */
1556 if (min_bits <= res->sr_bits)
1557 search = 0; /* success */
1558 else if (res->sr_bits) {
1559 /*
1560 * Don't show bits which we'll be returning
1561 * for allocation to the local alloc bitmap.
1562 */
1563 ocfs2_local_alloc_seen_free_bits(osb, res->sr_bits);
1564 }
1565 }
1566
1567 return search;
1568 }
1569
1570 static int ocfs2_block_group_search(struct inode *inode,
1571 struct buffer_head *group_bh,
1572 u32 bits_wanted, u32 min_bits,
1573 u64 max_block,
1574 struct ocfs2_suballoc_result *res)
1575 {
1576 int ret = -ENOSPC;
1577 u64 blkoff;
1578 struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) group_bh->b_data;
1579
1580 BUG_ON(min_bits != 1);
1581 BUG_ON(ocfs2_is_cluster_bitmap(inode));
1582
1583 if (bg->bg_free_bits_count) {
1584 ret = ocfs2_block_group_find_clear_bits(OCFS2_SB(inode->i_sb),
1585 group_bh, bits_wanted,
1586 le16_to_cpu(bg->bg_bits),
1587 res);
1588 if (!ret && max_block) {
1589 blkoff = le64_to_cpu(bg->bg_blkno) +
1590 res->sr_bit_offset + res->sr_bits;
1591 mlog(0, "Checking %llu against %llu\n",
1592 (unsigned long long)blkoff,
1593 (unsigned long long)max_block);
1594 if (blkoff > max_block)
1595 ret = -ENOSPC;
1596 }
1597 }
1598
1599 return ret;
1600 }
1601
1602 static int ocfs2_alloc_dinode_update_counts(struct inode *inode,
1603 handle_t *handle,
1604 struct buffer_head *di_bh,
1605 u32 num_bits,
1606 u16 chain)
1607 {
1608 int ret;
1609 u32 tmp_used;
1610 struct ocfs2_dinode *di = (struct ocfs2_dinode *) di_bh->b_data;
1611 struct ocfs2_chain_list *cl = (struct ocfs2_chain_list *) &di->id2.i_chain;
1612
1613 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
1614 OCFS2_JOURNAL_ACCESS_WRITE);
1615 if (ret < 0) {
1616 mlog_errno(ret);
1617 goto out;
1618 }
1619
1620 tmp_used = le32_to_cpu(di->id1.bitmap1.i_used);
1621 di->id1.bitmap1.i_used = cpu_to_le32(num_bits + tmp_used);
1622 le32_add_cpu(&cl->cl_recs[chain].c_free, -num_bits);
1623 ocfs2_journal_dirty(handle, di_bh);
1624
1625 out:
1626 return ret;
1627 }
1628
1629 static int ocfs2_bg_discontig_fix_by_rec(struct ocfs2_suballoc_result *res,
1630 struct ocfs2_extent_rec *rec,
1631 struct ocfs2_chain_list *cl)
1632 {
1633 unsigned int bpc = le16_to_cpu(cl->cl_bpc);
1634 unsigned int bitoff = le32_to_cpu(rec->e_cpos) * bpc;
1635 unsigned int bitcount = le32_to_cpu(rec->e_leaf_clusters) * bpc;
1636
1637 if (res->sr_bit_offset < bitoff)
1638 return 0;
1639 if (res->sr_bit_offset >= (bitoff + bitcount))
1640 return 0;
1641 res->sr_blkno = le64_to_cpu(rec->e_blkno) +
1642 (res->sr_bit_offset - bitoff);
1643 if ((res->sr_bit_offset + res->sr_bits) > (bitoff + bitcount))
1644 res->sr_bits = (bitoff + bitcount) - res->sr_bit_offset;
1645 return 1;
1646 }
1647
1648 static void ocfs2_bg_discontig_fix_result(struct ocfs2_alloc_context *ac,
1649 struct ocfs2_group_desc *bg,
1650 struct ocfs2_suballoc_result *res)
1651 {
1652 int i;
1653 u64 bg_blkno = res->sr_bg_blkno; /* Save off */
1654 struct ocfs2_extent_rec *rec;
1655 struct ocfs2_dinode *di = (struct ocfs2_dinode *)ac->ac_bh->b_data;
1656 struct ocfs2_chain_list *cl = &di->id2.i_chain;
1657
1658 if (ocfs2_is_cluster_bitmap(ac->ac_inode)) {
1659 res->sr_blkno = 0;
1660 return;
1661 }
1662
1663 res->sr_blkno = res->sr_bg_blkno + res->sr_bit_offset;
1664 res->sr_bg_blkno = 0; /* Clear it for contig block groups */
1665 if (!ocfs2_supports_discontig_bg(OCFS2_SB(ac->ac_inode->i_sb)) ||
1666 !bg->bg_list.l_next_free_rec)
1667 return;
1668
1669 for (i = 0; i < le16_to_cpu(bg->bg_list.l_next_free_rec); i++) {
1670 rec = &bg->bg_list.l_recs[i];
1671 if (ocfs2_bg_discontig_fix_by_rec(res, rec, cl)) {
1672 res->sr_bg_blkno = bg_blkno; /* Restore */
1673 break;
1674 }
1675 }
1676 }
1677
1678 static int ocfs2_search_one_group(struct ocfs2_alloc_context *ac,
1679 handle_t *handle,
1680 u32 bits_wanted,
1681 u32 min_bits,
1682 struct ocfs2_suballoc_result *res,
1683 u16 *bits_left)
1684 {
1685 int ret;
1686 struct buffer_head *group_bh = NULL;
1687 struct ocfs2_group_desc *gd;
1688 struct ocfs2_dinode *di = (struct ocfs2_dinode *)ac->ac_bh->b_data;
1689 struct inode *alloc_inode = ac->ac_inode;
1690
1691 ret = ocfs2_read_group_descriptor(alloc_inode, di,
1692 res->sr_bg_blkno, &group_bh);
1693 if (ret < 0) {
1694 mlog_errno(ret);
1695 return ret;
1696 }
1697
1698 gd = (struct ocfs2_group_desc *) group_bh->b_data;
1699 ret = ac->ac_group_search(alloc_inode, group_bh, bits_wanted, min_bits,
1700 ac->ac_max_block, res);
1701 if (ret < 0) {
1702 if (ret != -ENOSPC)
1703 mlog_errno(ret);
1704 goto out;
1705 }
1706
1707 if (!ret)
1708 ocfs2_bg_discontig_fix_result(ac, gd, res);
1709
1710 /*
1711 * sr_bg_blkno might have been changed by
1712 * ocfs2_bg_discontig_fix_result
1713 */
1714 res->sr_bg_stable_blkno = group_bh->b_blocknr;
1715
1716 if (ac->ac_find_loc_only)
1717 goto out_loc_only;
1718
1719 ret = ocfs2_alloc_dinode_update_counts(alloc_inode, handle, ac->ac_bh,
1720 res->sr_bits,
1721 le16_to_cpu(gd->bg_chain));
1722 if (ret < 0) {
1723 mlog_errno(ret);
1724 goto out;
1725 }
1726
1727 ret = ocfs2_block_group_set_bits(handle, alloc_inode, gd, group_bh,
1728 res->sr_bit_offset, res->sr_bits);
1729 if (ret < 0)
1730 mlog_errno(ret);
1731
1732 out_loc_only:
1733 *bits_left = le16_to_cpu(gd->bg_free_bits_count);
1734
1735 out:
1736 brelse(group_bh);
1737
1738 return ret;
1739 }
1740
1741 static int ocfs2_search_chain(struct ocfs2_alloc_context *ac,
1742 handle_t *handle,
1743 u32 bits_wanted,
1744 u32 min_bits,
1745 struct ocfs2_suballoc_result *res,
1746 u16 *bits_left)
1747 {
1748 int status;
1749 u16 chain;
1750 u64 next_group;
1751 struct inode *alloc_inode = ac->ac_inode;
1752 struct buffer_head *group_bh = NULL;
1753 struct buffer_head *prev_group_bh = NULL;
1754 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) ac->ac_bh->b_data;
1755 struct ocfs2_chain_list *cl = (struct ocfs2_chain_list *) &fe->id2.i_chain;
1756 struct ocfs2_group_desc *bg;
1757
1758 chain = ac->ac_chain;
1759 mlog(0, "trying to alloc %u bits from chain %u, inode %llu\n",
1760 bits_wanted, chain,
1761 (unsigned long long)OCFS2_I(alloc_inode)->ip_blkno);
1762
1763 status = ocfs2_read_group_descriptor(alloc_inode, fe,
1764 le64_to_cpu(cl->cl_recs[chain].c_blkno),
1765 &group_bh);
1766 if (status < 0) {
1767 mlog_errno(status);
1768 goto bail;
1769 }
1770 bg = (struct ocfs2_group_desc *) group_bh->b_data;
1771
1772 status = -ENOSPC;
1773 /* for now, the chain search is a bit simplistic. We just use
1774 * the 1st group with any empty bits. */
1775 while ((status = ac->ac_group_search(alloc_inode, group_bh,
1776 bits_wanted, min_bits,
1777 ac->ac_max_block,
1778 res)) == -ENOSPC) {
1779 if (!bg->bg_next_group)
1780 break;
1781
1782 brelse(prev_group_bh);
1783 prev_group_bh = NULL;
1784
1785 next_group = le64_to_cpu(bg->bg_next_group);
1786 prev_group_bh = group_bh;
1787 group_bh = NULL;
1788 status = ocfs2_read_group_descriptor(alloc_inode, fe,
1789 next_group, &group_bh);
1790 if (status < 0) {
1791 mlog_errno(status);
1792 goto bail;
1793 }
1794 bg = (struct ocfs2_group_desc *) group_bh->b_data;
1795 }
1796 if (status < 0) {
1797 if (status != -ENOSPC)
1798 mlog_errno(status);
1799 goto bail;
1800 }
1801
1802 mlog(0, "alloc succeeds: we give %u bits from block group %llu\n",
1803 res->sr_bits, (unsigned long long)le64_to_cpu(bg->bg_blkno));
1804
1805 res->sr_bg_blkno = le64_to_cpu(bg->bg_blkno);
1806
1807 BUG_ON(res->sr_bits == 0);
1808 if (!status)
1809 ocfs2_bg_discontig_fix_result(ac, bg, res);
1810
1811 /*
1812 * sr_bg_blkno might have been changed by
1813 * ocfs2_bg_discontig_fix_result
1814 */
1815 res->sr_bg_stable_blkno = group_bh->b_blocknr;
1816
1817 /*
1818 * Keep track of previous block descriptor read. When
1819 * we find a target, if we have read more than X
1820 * number of descriptors, and the target is reasonably
1821 * empty, relink him to top of his chain.
1822 *
1823 * We've read 0 extra blocks and only send one more to
1824 * the transaction, yet the next guy to search has a
1825 * much easier time.
1826 *
1827 * Do this *after* figuring out how many bits we're taking out
1828 * of our target group.
1829 */
1830 if (ac->ac_allow_chain_relink &&
1831 (prev_group_bh) &&
1832 (ocfs2_block_group_reasonably_empty(bg, res->sr_bits))) {
1833 status = ocfs2_relink_block_group(handle, alloc_inode,
1834 ac->ac_bh, group_bh,
1835 prev_group_bh, chain);
1836 if (status < 0) {
1837 mlog_errno(status);
1838 goto bail;
1839 }
1840 }
1841
1842 if (ac->ac_find_loc_only)
1843 goto out_loc_only;
1844
1845 status = ocfs2_alloc_dinode_update_counts(alloc_inode, handle,
1846 ac->ac_bh, res->sr_bits,
1847 chain);
1848 if (status) {
1849 mlog_errno(status);
1850 goto bail;
1851 }
1852
1853 status = ocfs2_block_group_set_bits(handle,
1854 alloc_inode,
1855 bg,
1856 group_bh,
1857 res->sr_bit_offset,
1858 res->sr_bits);
1859 if (status < 0) {
1860 mlog_errno(status);
1861 goto bail;
1862 }
1863
1864 mlog(0, "Allocated %u bits from suballocator %llu\n", res->sr_bits,
1865 (unsigned long long)le64_to_cpu(fe->i_blkno));
1866
1867 out_loc_only:
1868 *bits_left = le16_to_cpu(bg->bg_free_bits_count);
1869 bail:
1870 brelse(group_bh);
1871 brelse(prev_group_bh);
1872
1873 mlog_exit(status);
1874 return status;
1875 }
1876
1877 /* will give out up to bits_wanted contiguous bits. */
1878 static int ocfs2_claim_suballoc_bits(struct ocfs2_alloc_context *ac,
1879 handle_t *handle,
1880 u32 bits_wanted,
1881 u32 min_bits,
1882 struct ocfs2_suballoc_result *res)
1883 {
1884 int status;
1885 u16 victim, i;
1886 u16 bits_left = 0;
1887 u64 hint = ac->ac_last_group;
1888 struct ocfs2_chain_list *cl;
1889 struct ocfs2_dinode *fe;
1890
1891 mlog_entry_void();
1892
1893 BUG_ON(ac->ac_bits_given >= ac->ac_bits_wanted);
1894 BUG_ON(bits_wanted > (ac->ac_bits_wanted - ac->ac_bits_given));
1895 BUG_ON(!ac->ac_bh);
1896
1897 fe = (struct ocfs2_dinode *) ac->ac_bh->b_data;
1898
1899 /* The bh was validated by the inode read during
1900 * ocfs2_reserve_suballoc_bits(). Any corruption is a code bug. */
1901 BUG_ON(!OCFS2_IS_VALID_DINODE(fe));
1902
1903 if (le32_to_cpu(fe->id1.bitmap1.i_used) >=
1904 le32_to_cpu(fe->id1.bitmap1.i_total)) {
1905 ocfs2_error(ac->ac_inode->i_sb,
1906 "Chain allocator dinode %llu has %u used "
1907 "bits but only %u total.",
1908 (unsigned long long)le64_to_cpu(fe->i_blkno),
1909 le32_to_cpu(fe->id1.bitmap1.i_used),
1910 le32_to_cpu(fe->id1.bitmap1.i_total));
1911 status = -EIO;
1912 goto bail;
1913 }
1914
1915 res->sr_bg_blkno = hint;
1916 if (res->sr_bg_blkno) {
1917 /* Attempt to short-circuit the usual search mechanism
1918 * by jumping straight to the most recently used
1919 * allocation group. This helps us maintain some
1920 * contiguousness across allocations. */
1921 status = ocfs2_search_one_group(ac, handle, bits_wanted,
1922 min_bits, res, &bits_left);
1923 if (!status)
1924 goto set_hint;
1925 if (status < 0 && status != -ENOSPC) {
1926 mlog_errno(status);
1927 goto bail;
1928 }
1929 }
1930
1931 cl = (struct ocfs2_chain_list *) &fe->id2.i_chain;
1932
1933 victim = ocfs2_find_victim_chain(cl);
1934 ac->ac_chain = victim;
1935 ac->ac_allow_chain_relink = 1;
1936
1937 status = ocfs2_search_chain(ac, handle, bits_wanted, min_bits,
1938 res, &bits_left);
1939 if (!status) {
1940 hint = ocfs2_group_from_res(res);
1941 goto set_hint;
1942 }
1943 if (status < 0 && status != -ENOSPC) {
1944 mlog_errno(status);
1945 goto bail;
1946 }
1947
1948 mlog(0, "Search of victim chain %u came up with nothing, "
1949 "trying all chains now.\n", victim);
1950
1951 /* If we didn't pick a good victim, then just default to
1952 * searching each chain in order. Don't allow chain relinking
1953 * because we only calculate enough journal credits for one
1954 * relink per alloc. */
1955 ac->ac_allow_chain_relink = 0;
1956 for (i = 0; i < le16_to_cpu(cl->cl_next_free_rec); i ++) {
1957 if (i == victim)
1958 continue;
1959 if (!cl->cl_recs[i].c_free)
1960 continue;
1961
1962 ac->ac_chain = i;
1963 status = ocfs2_search_chain(ac, handle, bits_wanted, min_bits,
1964 res, &bits_left);
1965 if (!status) {
1966 hint = ocfs2_group_from_res(res);
1967 break;
1968 }
1969 if (status < 0 && status != -ENOSPC) {
1970 mlog_errno(status);
1971 goto bail;
1972 }
1973 }
1974
1975 set_hint:
1976 if (status != -ENOSPC) {
1977 /* If the next search of this group is not likely to
1978 * yield a suitable extent, then we reset the last
1979 * group hint so as to not waste a disk read */
1980 if (bits_left < min_bits)
1981 ac->ac_last_group = 0;
1982 else
1983 ac->ac_last_group = hint;
1984 }
1985
1986 bail:
1987 mlog_exit(status);
1988 return status;
1989 }
1990
1991 int ocfs2_claim_metadata(handle_t *handle,
1992 struct ocfs2_alloc_context *ac,
1993 u32 bits_wanted,
1994 u64 *suballoc_loc,
1995 u16 *suballoc_bit_start,
1996 unsigned int *num_bits,
1997 u64 *blkno_start)
1998 {
1999 int status;
2000 struct ocfs2_suballoc_result res = { .sr_blkno = 0, };
2001
2002 BUG_ON(!ac);
2003 BUG_ON(ac->ac_bits_wanted < (ac->ac_bits_given + bits_wanted));
2004 BUG_ON(ac->ac_which != OCFS2_AC_USE_META);
2005
2006 status = ocfs2_claim_suballoc_bits(ac,
2007 handle,
2008 bits_wanted,
2009 1,
2010 &res);
2011 if (status < 0) {
2012 mlog_errno(status);
2013 goto bail;
2014 }
2015 atomic_inc(&OCFS2_SB(ac->ac_inode->i_sb)->alloc_stats.bg_allocs);
2016
2017 *suballoc_loc = res.sr_bg_blkno;
2018 *suballoc_bit_start = res.sr_bit_offset;
2019 *blkno_start = res.sr_blkno;
2020 ac->ac_bits_given += res.sr_bits;
2021 *num_bits = res.sr_bits;
2022 status = 0;
2023 bail:
2024 mlog_exit(status);
2025 return status;
2026 }
2027
2028 static void ocfs2_init_inode_ac_group(struct inode *dir,
2029 struct buffer_head *parent_di_bh,
2030 struct ocfs2_alloc_context *ac)
2031 {
2032 struct ocfs2_dinode *di = (struct ocfs2_dinode *)parent_di_bh->b_data;
2033 /*
2034 * Try to allocate inodes from some specific group.
2035 *
2036 * If the parent dir has recorded the last group used in allocation,
2037 * cool, use it. Otherwise if we try to allocate new inode from the
2038 * same slot the parent dir belongs to, use the same chunk.
2039 *
2040 * We are very careful here to avoid the mistake of setting
2041 * ac_last_group to a group descriptor from a different (unlocked) slot.
2042 */
2043 if (OCFS2_I(dir)->ip_last_used_group &&
2044 OCFS2_I(dir)->ip_last_used_slot == ac->ac_alloc_slot)
2045 ac->ac_last_group = OCFS2_I(dir)->ip_last_used_group;
2046 else if (le16_to_cpu(di->i_suballoc_slot) == ac->ac_alloc_slot) {
2047 if (di->i_suballoc_loc)
2048 ac->ac_last_group = le64_to_cpu(di->i_suballoc_loc);
2049 else
2050 ac->ac_last_group = ocfs2_which_suballoc_group(
2051 le64_to_cpu(di->i_blkno),
2052 le16_to_cpu(di->i_suballoc_bit));
2053 }
2054 }
2055
2056 static inline void ocfs2_save_inode_ac_group(struct inode *dir,
2057 struct ocfs2_alloc_context *ac)
2058 {
2059 OCFS2_I(dir)->ip_last_used_group = ac->ac_last_group;
2060 OCFS2_I(dir)->ip_last_used_slot = ac->ac_alloc_slot;
2061 }
2062
2063 int ocfs2_find_new_inode_loc(struct inode *dir,
2064 struct buffer_head *parent_fe_bh,
2065 struct ocfs2_alloc_context *ac,
2066 u64 *fe_blkno)
2067 {
2068 int ret;
2069 handle_t *handle = NULL;
2070 struct ocfs2_suballoc_result *res;
2071
2072 BUG_ON(!ac);
2073 BUG_ON(ac->ac_bits_given != 0);
2074 BUG_ON(ac->ac_bits_wanted != 1);
2075 BUG_ON(ac->ac_which != OCFS2_AC_USE_INODE);
2076
2077 res = kzalloc(sizeof(*res), GFP_NOFS);
2078 if (res == NULL) {
2079 ret = -ENOMEM;
2080 mlog_errno(ret);
2081 goto out;
2082 }
2083
2084 ocfs2_init_inode_ac_group(dir, parent_fe_bh, ac);
2085
2086 /*
2087 * The handle started here is for chain relink. Alternatively,
2088 * we could just disable relink for these calls.
2089 */
2090 handle = ocfs2_start_trans(OCFS2_SB(dir->i_sb), OCFS2_SUBALLOC_ALLOC);
2091 if (IS_ERR(handle)) {
2092 ret = PTR_ERR(handle);
2093 handle = NULL;
2094 mlog_errno(ret);
2095 goto out;
2096 }
2097
2098 /*
2099 * This will instruct ocfs2_claim_suballoc_bits and
2100 * ocfs2_search_one_group to search but save actual allocation
2101 * for later.
2102 */
2103 ac->ac_find_loc_only = 1;
2104
2105 ret = ocfs2_claim_suballoc_bits(ac, handle, 1, 1, res);
2106 if (ret < 0) {
2107 mlog_errno(ret);
2108 goto out;
2109 }
2110
2111 ac->ac_find_loc_priv = res;
2112 *fe_blkno = res->sr_blkno;
2113
2114 out:
2115 if (handle)
2116 ocfs2_commit_trans(OCFS2_SB(dir->i_sb), handle);
2117
2118 if (ret)
2119 kfree(res);
2120
2121 return ret;
2122 }
2123
2124 int ocfs2_claim_new_inode_at_loc(handle_t *handle,
2125 struct inode *dir,
2126 struct ocfs2_alloc_context *ac,
2127 u64 *suballoc_loc,
2128 u16 *suballoc_bit,
2129 u64 di_blkno)
2130 {
2131 int ret;
2132 u16 chain;
2133 struct ocfs2_suballoc_result *res = ac->ac_find_loc_priv;
2134 struct buffer_head *bg_bh = NULL;
2135 struct ocfs2_group_desc *bg;
2136 struct ocfs2_dinode *di = (struct ocfs2_dinode *) ac->ac_bh->b_data;
2137
2138 /*
2139 * Since di_blkno is being passed back in, we check for any
2140 * inconsistencies which may have happened between
2141 * calls. These are code bugs as di_blkno is not expected to
2142 * change once returned from ocfs2_find_new_inode_loc()
2143 */
2144 BUG_ON(res->sr_blkno != di_blkno);
2145
2146 ret = ocfs2_read_group_descriptor(ac->ac_inode, di,
2147 res->sr_bg_stable_blkno, &bg_bh);
2148 if (ret) {
2149 mlog_errno(ret);
2150 goto out;
2151 }
2152
2153 bg = (struct ocfs2_group_desc *) bg_bh->b_data;
2154 chain = le16_to_cpu(bg->bg_chain);
2155
2156 ret = ocfs2_alloc_dinode_update_counts(ac->ac_inode, handle,
2157 ac->ac_bh, res->sr_bits,
2158 chain);
2159 if (ret) {
2160 mlog_errno(ret);
2161 goto out;
2162 }
2163
2164 ret = ocfs2_block_group_set_bits(handle,
2165 ac->ac_inode,
2166 bg,
2167 bg_bh,
2168 res->sr_bit_offset,
2169 res->sr_bits);
2170 if (ret < 0) {
2171 mlog_errno(ret);
2172 goto out;
2173 }
2174
2175 mlog(0, "Allocated %u bits from suballocator %llu\n", res->sr_bits,
2176 (unsigned long long)di_blkno);
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 mlog_entry_void();
2205
2206 BUG_ON(!ac);
2207 BUG_ON(ac->ac_bits_given != 0);
2208 BUG_ON(ac->ac_bits_wanted != 1);
2209 BUG_ON(ac->ac_which != OCFS2_AC_USE_INODE);
2210
2211 ocfs2_init_inode_ac_group(dir, parent_fe_bh, ac);
2212
2213 status = ocfs2_claim_suballoc_bits(ac,
2214 handle,
2215 1,
2216 1,
2217 &res);
2218 if (status < 0) {
2219 mlog_errno(status);
2220 goto bail;
2221 }
2222 atomic_inc(&OCFS2_SB(ac->ac_inode->i_sb)->alloc_stats.bg_allocs);
2223
2224 BUG_ON(res.sr_bits != 1);
2225
2226 *suballoc_loc = res.sr_bg_blkno;
2227 *suballoc_bit = res.sr_bit_offset;
2228 *fe_blkno = res.sr_blkno;
2229 ac->ac_bits_given++;
2230 ocfs2_save_inode_ac_group(dir, ac);
2231 status = 0;
2232 bail:
2233 mlog_exit(status);
2234 return status;
2235 }
2236
2237 /* translate a group desc. blkno and it's bitmap offset into
2238 * disk cluster offset. */
2239 static inline u32 ocfs2_desc_bitmap_to_cluster_off(struct inode *inode,
2240 u64 bg_blkno,
2241 u16 bg_bit_off)
2242 {
2243 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2244 u32 cluster = 0;
2245
2246 BUG_ON(!ocfs2_is_cluster_bitmap(inode));
2247
2248 if (bg_blkno != osb->first_cluster_group_blkno)
2249 cluster = ocfs2_blocks_to_clusters(inode->i_sb, bg_blkno);
2250 cluster += (u32) bg_bit_off;
2251 return cluster;
2252 }
2253
2254 /* given a cluster offset, calculate which block group it belongs to
2255 * and return that block offset. */
2256 u64 ocfs2_which_cluster_group(struct inode *inode, u32 cluster)
2257 {
2258 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2259 u32 group_no;
2260
2261 BUG_ON(!ocfs2_is_cluster_bitmap(inode));
2262
2263 group_no = cluster / osb->bitmap_cpg;
2264 if (!group_no)
2265 return osb->first_cluster_group_blkno;
2266 return ocfs2_clusters_to_blocks(inode->i_sb,
2267 group_no * osb->bitmap_cpg);
2268 }
2269
2270 /* given the block number of a cluster start, calculate which cluster
2271 * group and descriptor bitmap offset that corresponds to. */
2272 static inline void ocfs2_block_to_cluster_group(struct inode *inode,
2273 u64 data_blkno,
2274 u64 *bg_blkno,
2275 u16 *bg_bit_off)
2276 {
2277 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2278 u32 data_cluster = ocfs2_blocks_to_clusters(osb->sb, data_blkno);
2279
2280 BUG_ON(!ocfs2_is_cluster_bitmap(inode));
2281
2282 *bg_blkno = ocfs2_which_cluster_group(inode,
2283 data_cluster);
2284
2285 if (*bg_blkno == osb->first_cluster_group_blkno)
2286 *bg_bit_off = (u16) data_cluster;
2287 else
2288 *bg_bit_off = (u16) ocfs2_blocks_to_clusters(osb->sb,
2289 data_blkno - *bg_blkno);
2290 }
2291
2292 /*
2293 * min_bits - minimum contiguous chunk from this total allocation we
2294 * can handle. set to what we asked for originally for a full
2295 * contig. allocation, set to '1' to indicate we can deal with extents
2296 * of any size.
2297 */
2298 int __ocfs2_claim_clusters(handle_t *handle,
2299 struct ocfs2_alloc_context *ac,
2300 u32 min_clusters,
2301 u32 max_clusters,
2302 u32 *cluster_start,
2303 u32 *num_clusters)
2304 {
2305 int status;
2306 unsigned int bits_wanted = max_clusters;
2307 struct ocfs2_suballoc_result res = { .sr_blkno = 0, };
2308 struct ocfs2_super *osb = OCFS2_SB(ac->ac_inode->i_sb);
2309
2310 mlog_entry_void();
2311
2312 BUG_ON(ac->ac_bits_given >= ac->ac_bits_wanted);
2313
2314 BUG_ON(ac->ac_which != OCFS2_AC_USE_LOCAL
2315 && ac->ac_which != OCFS2_AC_USE_MAIN);
2316
2317 if (ac->ac_which == OCFS2_AC_USE_LOCAL) {
2318 WARN_ON(min_clusters > 1);
2319
2320 status = ocfs2_claim_local_alloc_bits(osb,
2321 handle,
2322 ac,
2323 bits_wanted,
2324 cluster_start,
2325 num_clusters);
2326 if (!status)
2327 atomic_inc(&osb->alloc_stats.local_data);
2328 } else {
2329 if (min_clusters > (osb->bitmap_cpg - 1)) {
2330 /* The only paths asking for contiguousness
2331 * should know about this already. */
2332 mlog(ML_ERROR, "minimum allocation requested %u exceeds "
2333 "group bitmap size %u!\n", min_clusters,
2334 osb->bitmap_cpg);
2335 status = -ENOSPC;
2336 goto bail;
2337 }
2338 /* clamp the current request down to a realistic size. */
2339 if (bits_wanted > (osb->bitmap_cpg - 1))
2340 bits_wanted = osb->bitmap_cpg - 1;
2341
2342 status = ocfs2_claim_suballoc_bits(ac,
2343 handle,
2344 bits_wanted,
2345 min_clusters,
2346 &res);
2347 if (!status) {
2348 BUG_ON(res.sr_blkno); /* cluster alloc can't set */
2349 *cluster_start =
2350 ocfs2_desc_bitmap_to_cluster_off(ac->ac_inode,
2351 res.sr_bg_blkno,
2352 res.sr_bit_offset);
2353 atomic_inc(&osb->alloc_stats.bitmap_data);
2354 *num_clusters = res.sr_bits;
2355 }
2356 }
2357 if (status < 0) {
2358 if (status != -ENOSPC)
2359 mlog_errno(status);
2360 goto bail;
2361 }
2362
2363 ac->ac_bits_given += *num_clusters;
2364
2365 bail:
2366 mlog_exit(status);
2367 return status;
2368 }
2369
2370 int ocfs2_claim_clusters(handle_t *handle,
2371 struct ocfs2_alloc_context *ac,
2372 u32 min_clusters,
2373 u32 *cluster_start,
2374 u32 *num_clusters)
2375 {
2376 unsigned int bits_wanted = ac->ac_bits_wanted - ac->ac_bits_given;
2377
2378 return __ocfs2_claim_clusters(handle, ac, min_clusters,
2379 bits_wanted, cluster_start, num_clusters);
2380 }
2381
2382 static int ocfs2_block_group_clear_bits(handle_t *handle,
2383 struct inode *alloc_inode,
2384 struct ocfs2_group_desc *bg,
2385 struct buffer_head *group_bh,
2386 unsigned int bit_off,
2387 unsigned int num_bits,
2388 void (*undo_fn)(unsigned int bit,
2389 unsigned long *bmap))
2390 {
2391 int status;
2392 unsigned int tmp;
2393 struct ocfs2_group_desc *undo_bg = NULL;
2394
2395 mlog_entry_void();
2396
2397 /* The caller got this descriptor from
2398 * ocfs2_read_group_descriptor(). Any corruption is a code bug. */
2399 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
2400
2401 mlog(0, "off = %u, num = %u\n", bit_off, num_bits);
2402
2403 BUG_ON(undo_fn && !ocfs2_is_cluster_bitmap(alloc_inode));
2404 status = ocfs2_journal_access_gd(handle, INODE_CACHE(alloc_inode),
2405 group_bh,
2406 undo_fn ?
2407 OCFS2_JOURNAL_ACCESS_UNDO :
2408 OCFS2_JOURNAL_ACCESS_WRITE);
2409 if (status < 0) {
2410 mlog_errno(status);
2411 goto bail;
2412 }
2413
2414 if (undo_fn) {
2415 jbd_lock_bh_state(group_bh);
2416 undo_bg = (struct ocfs2_group_desc *)
2417 bh2jh(group_bh)->b_committed_data;
2418 BUG_ON(!undo_bg);
2419 }
2420
2421 tmp = num_bits;
2422 while(tmp--) {
2423 ocfs2_clear_bit((bit_off + tmp),
2424 (unsigned long *) bg->bg_bitmap);
2425 if (undo_fn)
2426 undo_fn(bit_off + tmp,
2427 (unsigned long *) undo_bg->bg_bitmap);
2428 }
2429 le16_add_cpu(&bg->bg_free_bits_count, num_bits);
2430 if (le16_to_cpu(bg->bg_free_bits_count) > le16_to_cpu(bg->bg_bits)) {
2431 ocfs2_error(alloc_inode->i_sb, "Group descriptor # %llu has bit"
2432 " count %u but claims %u are freed. num_bits %d",
2433 (unsigned long long)le64_to_cpu(bg->bg_blkno),
2434 le16_to_cpu(bg->bg_bits),
2435 le16_to_cpu(bg->bg_free_bits_count), num_bits);
2436 return -EROFS;
2437 }
2438
2439 if (undo_fn)
2440 jbd_unlock_bh_state(group_bh);
2441
2442 ocfs2_journal_dirty(handle, group_bh);
2443 bail:
2444 return status;
2445 }
2446
2447 /*
2448 * expects the suballoc inode to already be locked.
2449 */
2450 static int _ocfs2_free_suballoc_bits(handle_t *handle,
2451 struct inode *alloc_inode,
2452 struct buffer_head *alloc_bh,
2453 unsigned int start_bit,
2454 u64 bg_blkno,
2455 unsigned int count,
2456 void (*undo_fn)(unsigned int bit,
2457 unsigned long *bitmap))
2458 {
2459 int status = 0;
2460 u32 tmp_used;
2461 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) alloc_bh->b_data;
2462 struct ocfs2_chain_list *cl = &fe->id2.i_chain;
2463 struct buffer_head *group_bh = NULL;
2464 struct ocfs2_group_desc *group;
2465
2466 mlog_entry_void();
2467
2468 /* The alloc_bh comes from ocfs2_free_dinode() or
2469 * ocfs2_free_clusters(). The callers have all locked the
2470 * allocator and gotten alloc_bh from the lock call. This
2471 * validates the dinode buffer. Any corruption that has happended
2472 * is a code bug. */
2473 BUG_ON(!OCFS2_IS_VALID_DINODE(fe));
2474 BUG_ON((count + start_bit) > ocfs2_bits_per_group(cl));
2475
2476 mlog(0, "%llu: freeing %u bits from group %llu, starting at %u\n",
2477 (unsigned long long)OCFS2_I(alloc_inode)->ip_blkno, count,
2478 (unsigned long long)bg_blkno, start_bit);
2479
2480 status = ocfs2_read_group_descriptor(alloc_inode, fe, bg_blkno,
2481 &group_bh);
2482 if (status < 0) {
2483 mlog_errno(status);
2484 goto bail;
2485 }
2486 group = (struct ocfs2_group_desc *) group_bh->b_data;
2487
2488 BUG_ON((count + start_bit) > le16_to_cpu(group->bg_bits));
2489
2490 status = ocfs2_block_group_clear_bits(handle, alloc_inode,
2491 group, group_bh,
2492 start_bit, count, undo_fn);
2493 if (status < 0) {
2494 mlog_errno(status);
2495 goto bail;
2496 }
2497
2498 status = ocfs2_journal_access_di(handle, INODE_CACHE(alloc_inode),
2499 alloc_bh, OCFS2_JOURNAL_ACCESS_WRITE);
2500 if (status < 0) {
2501 mlog_errno(status);
2502 goto bail;
2503 }
2504
2505 le32_add_cpu(&cl->cl_recs[le16_to_cpu(group->bg_chain)].c_free,
2506 count);
2507 tmp_used = le32_to_cpu(fe->id1.bitmap1.i_used);
2508 fe->id1.bitmap1.i_used = cpu_to_le32(tmp_used - count);
2509 ocfs2_journal_dirty(handle, alloc_bh);
2510
2511 bail:
2512 brelse(group_bh);
2513
2514 mlog_exit(status);
2515 return status;
2516 }
2517
2518 int ocfs2_free_suballoc_bits(handle_t *handle,
2519 struct inode *alloc_inode,
2520 struct buffer_head *alloc_bh,
2521 unsigned int start_bit,
2522 u64 bg_blkno,
2523 unsigned int count)
2524 {
2525 return _ocfs2_free_suballoc_bits(handle, alloc_inode, alloc_bh,
2526 start_bit, bg_blkno, count, NULL);
2527 }
2528
2529 int ocfs2_free_dinode(handle_t *handle,
2530 struct inode *inode_alloc_inode,
2531 struct buffer_head *inode_alloc_bh,
2532 struct ocfs2_dinode *di)
2533 {
2534 u64 blk = le64_to_cpu(di->i_blkno);
2535 u16 bit = le16_to_cpu(di->i_suballoc_bit);
2536 u64 bg_blkno = ocfs2_which_suballoc_group(blk, bit);
2537
2538 if (di->i_suballoc_loc)
2539 bg_blkno = le64_to_cpu(di->i_suballoc_loc);
2540 return ocfs2_free_suballoc_bits(handle, inode_alloc_inode,
2541 inode_alloc_bh, bit, bg_blkno, 1);
2542 }
2543
2544 static int _ocfs2_free_clusters(handle_t *handle,
2545 struct inode *bitmap_inode,
2546 struct buffer_head *bitmap_bh,
2547 u64 start_blk,
2548 unsigned int num_clusters,
2549 void (*undo_fn)(unsigned int bit,
2550 unsigned long *bitmap))
2551 {
2552 int status;
2553 u16 bg_start_bit;
2554 u64 bg_blkno;
2555 struct ocfs2_dinode *fe;
2556
2557 /* You can't ever have a contiguous set of clusters
2558 * bigger than a block group bitmap so we never have to worry
2559 * about looping on them. */
2560
2561 mlog_entry_void();
2562
2563 /* This is expensive. We can safely remove once this stuff has
2564 * gotten tested really well. */
2565 BUG_ON(start_blk != ocfs2_clusters_to_blocks(bitmap_inode->i_sb, ocfs2_blocks_to_clusters(bitmap_inode->i_sb, start_blk)));
2566
2567 fe = (struct ocfs2_dinode *) bitmap_bh->b_data;
2568
2569 ocfs2_block_to_cluster_group(bitmap_inode, start_blk, &bg_blkno,
2570 &bg_start_bit);
2571
2572 mlog(0, "want to free %u clusters starting at block %llu\n",
2573 num_clusters, (unsigned long long)start_blk);
2574 mlog(0, "bg_blkno = %llu, bg_start_bit = %u\n",
2575 (unsigned long long)bg_blkno, bg_start_bit);
2576
2577 status = _ocfs2_free_suballoc_bits(handle, bitmap_inode, bitmap_bh,
2578 bg_start_bit, bg_blkno,
2579 num_clusters, undo_fn);
2580 if (status < 0) {
2581 mlog_errno(status);
2582 goto out;
2583 }
2584
2585 ocfs2_local_alloc_seen_free_bits(OCFS2_SB(bitmap_inode->i_sb),
2586 num_clusters);
2587
2588 out:
2589 mlog_exit(status);
2590 return status;
2591 }
2592
2593 int ocfs2_free_clusters(handle_t *handle,
2594 struct inode *bitmap_inode,
2595 struct buffer_head *bitmap_bh,
2596 u64 start_blk,
2597 unsigned int num_clusters)
2598 {
2599 return _ocfs2_free_clusters(handle, bitmap_inode, bitmap_bh,
2600 start_blk, num_clusters,
2601 _ocfs2_set_bit);
2602 }
2603
2604 /*
2605 * Give never-used clusters back to the global bitmap. We don't need
2606 * to protect these bits in the undo buffer.
2607 */
2608 int ocfs2_release_clusters(handle_t *handle,
2609 struct inode *bitmap_inode,
2610 struct buffer_head *bitmap_bh,
2611 u64 start_blk,
2612 unsigned int num_clusters)
2613 {
2614 return _ocfs2_free_clusters(handle, bitmap_inode, bitmap_bh,
2615 start_blk, num_clusters,
2616 _ocfs2_clear_bit);
2617 }
2618
2619 static inline void ocfs2_debug_bg(struct ocfs2_group_desc *bg)
2620 {
2621 printk("Block Group:\n");
2622 printk("bg_signature: %s\n", bg->bg_signature);
2623 printk("bg_size: %u\n", bg->bg_size);
2624 printk("bg_bits: %u\n", bg->bg_bits);
2625 printk("bg_free_bits_count: %u\n", bg->bg_free_bits_count);
2626 printk("bg_chain: %u\n", bg->bg_chain);
2627 printk("bg_generation: %u\n", le32_to_cpu(bg->bg_generation));
2628 printk("bg_next_group: %llu\n",
2629 (unsigned long long)bg->bg_next_group);
2630 printk("bg_parent_dinode: %llu\n",
2631 (unsigned long long)bg->bg_parent_dinode);
2632 printk("bg_blkno: %llu\n",
2633 (unsigned long long)bg->bg_blkno);
2634 }
2635
2636 static inline void ocfs2_debug_suballoc_inode(struct ocfs2_dinode *fe)
2637 {
2638 int i;
2639
2640 printk("Suballoc Inode %llu:\n", (unsigned long long)fe->i_blkno);
2641 printk("i_signature: %s\n", fe->i_signature);
2642 printk("i_size: %llu\n",
2643 (unsigned long long)fe->i_size);
2644 printk("i_clusters: %u\n", fe->i_clusters);
2645 printk("i_generation: %u\n",
2646 le32_to_cpu(fe->i_generation));
2647 printk("id1.bitmap1.i_used: %u\n",
2648 le32_to_cpu(fe->id1.bitmap1.i_used));
2649 printk("id1.bitmap1.i_total: %u\n",
2650 le32_to_cpu(fe->id1.bitmap1.i_total));
2651 printk("id2.i_chain.cl_cpg: %u\n", fe->id2.i_chain.cl_cpg);
2652 printk("id2.i_chain.cl_bpc: %u\n", fe->id2.i_chain.cl_bpc);
2653 printk("id2.i_chain.cl_count: %u\n", fe->id2.i_chain.cl_count);
2654 printk("id2.i_chain.cl_next_free_rec: %u\n",
2655 fe->id2.i_chain.cl_next_free_rec);
2656 for(i = 0; i < fe->id2.i_chain.cl_next_free_rec; i++) {
2657 printk("fe->id2.i_chain.cl_recs[%d].c_free: %u\n", i,
2658 fe->id2.i_chain.cl_recs[i].c_free);
2659 printk("fe->id2.i_chain.cl_recs[%d].c_total: %u\n", i,
2660 fe->id2.i_chain.cl_recs[i].c_total);
2661 printk("fe->id2.i_chain.cl_recs[%d].c_blkno: %llu\n", i,
2662 (unsigned long long)fe->id2.i_chain.cl_recs[i].c_blkno);
2663 }
2664 }
2665
2666 /*
2667 * For a given allocation, determine which allocators will need to be
2668 * accessed, and lock them, reserving the appropriate number of bits.
2669 *
2670 * Sparse file systems call this from ocfs2_write_begin_nolock()
2671 * and ocfs2_allocate_unwritten_extents().
2672 *
2673 * File systems which don't support holes call this from
2674 * ocfs2_extend_allocation().
2675 */
2676 int ocfs2_lock_allocators(struct inode *inode,
2677 struct ocfs2_extent_tree *et,
2678 u32 clusters_to_add, u32 extents_to_split,
2679 struct ocfs2_alloc_context **data_ac,
2680 struct ocfs2_alloc_context **meta_ac)
2681 {
2682 int ret = 0, num_free_extents;
2683 unsigned int max_recs_needed = clusters_to_add + 2 * extents_to_split;
2684 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2685
2686 *meta_ac = NULL;
2687 if (data_ac)
2688 *data_ac = NULL;
2689
2690 BUG_ON(clusters_to_add != 0 && data_ac == NULL);
2691
2692 num_free_extents = ocfs2_num_free_extents(osb, et);
2693 if (num_free_extents < 0) {
2694 ret = num_free_extents;
2695 mlog_errno(ret);
2696 goto out;
2697 }
2698
2699 /*
2700 * Sparse allocation file systems need to be more conservative
2701 * with reserving room for expansion - the actual allocation
2702 * happens while we've got a journal handle open so re-taking
2703 * a cluster lock (because we ran out of room for another
2704 * extent) will violate ordering rules.
2705 *
2706 * Most of the time we'll only be seeing this 1 cluster at a time
2707 * anyway.
2708 *
2709 * Always lock for any unwritten extents - we might want to
2710 * add blocks during a split.
2711 */
2712 if (!num_free_extents ||
2713 (ocfs2_sparse_alloc(osb) && num_free_extents < max_recs_needed)) {
2714 ret = ocfs2_reserve_new_metadata(osb, et->et_root_el, meta_ac);
2715 if (ret < 0) {
2716 if (ret != -ENOSPC)
2717 mlog_errno(ret);
2718 goto out;
2719 }
2720 }
2721
2722 if (clusters_to_add == 0)
2723 goto out;
2724
2725 ret = ocfs2_reserve_clusters(osb, clusters_to_add, data_ac);
2726 if (ret < 0) {
2727 if (ret != -ENOSPC)
2728 mlog_errno(ret);
2729 goto out;
2730 }
2731
2732 out:
2733 if (ret) {
2734 if (*meta_ac) {
2735 ocfs2_free_alloc_context(*meta_ac);
2736 *meta_ac = NULL;
2737 }
2738
2739 /*
2740 * We cannot have an error and a non null *data_ac.
2741 */
2742 }
2743
2744 return ret;
2745 }
2746
2747 /*
2748 * Read the inode specified by blkno to get suballoc_slot and
2749 * suballoc_bit.
2750 */
2751 static int ocfs2_get_suballoc_slot_bit(struct ocfs2_super *osb, u64 blkno,
2752 u16 *suballoc_slot, u64 *group_blkno,
2753 u16 *suballoc_bit)
2754 {
2755 int status;
2756 struct buffer_head *inode_bh = NULL;
2757 struct ocfs2_dinode *inode_fe;
2758
2759 mlog_entry("blkno: %llu\n", (unsigned long long)blkno);
2760
2761 /* dirty read disk */
2762 status = ocfs2_read_blocks_sync(osb, blkno, 1, &inode_bh);
2763 if (status < 0) {
2764 mlog(ML_ERROR, "read block %llu failed %d\n",
2765 (unsigned long long)blkno, status);
2766 goto bail;
2767 }
2768
2769 inode_fe = (struct ocfs2_dinode *) inode_bh->b_data;
2770 if (!OCFS2_IS_VALID_DINODE(inode_fe)) {
2771 mlog(ML_ERROR, "invalid inode %llu requested\n",
2772 (unsigned long long)blkno);
2773 status = -EINVAL;
2774 goto bail;
2775 }
2776
2777 if (le16_to_cpu(inode_fe->i_suballoc_slot) != (u16)OCFS2_INVALID_SLOT &&
2778 (u32)le16_to_cpu(inode_fe->i_suballoc_slot) > osb->max_slots - 1) {
2779 mlog(ML_ERROR, "inode %llu has invalid suballoc slot %u\n",
2780 (unsigned long long)blkno,
2781 (u32)le16_to_cpu(inode_fe->i_suballoc_slot));
2782 status = -EINVAL;
2783 goto bail;
2784 }
2785
2786 if (suballoc_slot)
2787 *suballoc_slot = le16_to_cpu(inode_fe->i_suballoc_slot);
2788 if (suballoc_bit)
2789 *suballoc_bit = le16_to_cpu(inode_fe->i_suballoc_bit);
2790 if (group_blkno)
2791 *group_blkno = le64_to_cpu(inode_fe->i_suballoc_loc);
2792
2793 bail:
2794 brelse(inode_bh);
2795
2796 mlog_exit(status);
2797 return status;
2798 }
2799
2800 /*
2801 * test whether bit is SET in allocator bitmap or not. on success, 0
2802 * is returned and *res is 1 for SET; 0 otherwise. when fails, errno
2803 * is returned and *res is meaningless. Call this after you have
2804 * cluster locked against suballoc, or you may get a result based on
2805 * non-up2date contents
2806 */
2807 static int ocfs2_test_suballoc_bit(struct ocfs2_super *osb,
2808 struct inode *suballoc,
2809 struct buffer_head *alloc_bh,
2810 u64 group_blkno, u64 blkno,
2811 u16 bit, int *res)
2812 {
2813 struct ocfs2_dinode *alloc_di;
2814 struct ocfs2_group_desc *group;
2815 struct buffer_head *group_bh = NULL;
2816 u64 bg_blkno;
2817 int status;
2818
2819 mlog_entry("blkno: %llu bit: %u\n", (unsigned long long)blkno,
2820 (unsigned int)bit);
2821
2822 alloc_di = (struct ocfs2_dinode *)alloc_bh->b_data;
2823 if ((bit + 1) > ocfs2_bits_per_group(&alloc_di->id2.i_chain)) {
2824 mlog(ML_ERROR, "suballoc bit %u out of range of %u\n",
2825 (unsigned int)bit,
2826 ocfs2_bits_per_group(&alloc_di->id2.i_chain));
2827 status = -EINVAL;
2828 goto bail;
2829 }
2830
2831 bg_blkno = group_blkno ? group_blkno :
2832 ocfs2_which_suballoc_group(blkno, bit);
2833 status = ocfs2_read_group_descriptor(suballoc, alloc_di, bg_blkno,
2834 &group_bh);
2835 if (status < 0) {
2836 mlog(ML_ERROR, "read group %llu failed %d\n",
2837 (unsigned long long)bg_blkno, status);
2838 goto bail;
2839 }
2840
2841 group = (struct ocfs2_group_desc *) group_bh->b_data;
2842 *res = ocfs2_test_bit(bit, (unsigned long *)group->bg_bitmap);
2843
2844 bail:
2845 brelse(group_bh);
2846
2847 mlog_exit(status);
2848 return status;
2849 }
2850
2851 /*
2852 * Test if the bit representing this inode (blkno) is set in the
2853 * suballocator.
2854 *
2855 * On success, 0 is returned and *res is 1 for SET; 0 otherwise.
2856 *
2857 * In the event of failure, a negative value is returned and *res is
2858 * meaningless.
2859 *
2860 * Callers must make sure to hold nfs_sync_lock to prevent
2861 * ocfs2_delete_inode() on another node from accessing the same
2862 * suballocator concurrently.
2863 */
2864 int ocfs2_test_inode_bit(struct ocfs2_super *osb, u64 blkno, int *res)
2865 {
2866 int status;
2867 u64 group_blkno = 0;
2868 u16 suballoc_bit = 0, suballoc_slot = 0;
2869 struct inode *inode_alloc_inode;
2870 struct buffer_head *alloc_bh = NULL;
2871
2872 mlog_entry("blkno: %llu", (unsigned long long)blkno);
2873
2874 status = ocfs2_get_suballoc_slot_bit(osb, blkno, &suballoc_slot,
2875 &group_blkno, &suballoc_bit);
2876 if (status < 0) {
2877 mlog(ML_ERROR, "get alloc slot and bit failed %d\n", status);
2878 goto bail;
2879 }
2880
2881 inode_alloc_inode =
2882 ocfs2_get_system_file_inode(osb, INODE_ALLOC_SYSTEM_INODE,
2883 suballoc_slot);
2884 if (!inode_alloc_inode) {
2885 /* the error code could be inaccurate, but we are not able to
2886 * get the correct one. */
2887 status = -EINVAL;
2888 mlog(ML_ERROR, "unable to get alloc inode in slot %u\n",
2889 (u32)suballoc_slot);
2890 goto bail;
2891 }
2892
2893 mutex_lock(&inode_alloc_inode->i_mutex);
2894 status = ocfs2_inode_lock(inode_alloc_inode, &alloc_bh, 0);
2895 if (status < 0) {
2896 mutex_unlock(&inode_alloc_inode->i_mutex);
2897 mlog(ML_ERROR, "lock on alloc inode on slot %u failed %d\n",
2898 (u32)suballoc_slot, status);
2899 goto bail;
2900 }
2901
2902 status = ocfs2_test_suballoc_bit(osb, inode_alloc_inode, alloc_bh,
2903 group_blkno, blkno, suballoc_bit, res);
2904 if (status < 0)
2905 mlog(ML_ERROR, "test suballoc bit failed %d\n", status);
2906
2907 ocfs2_inode_unlock(inode_alloc_inode, 0);
2908 mutex_unlock(&inode_alloc_inode->i_mutex);
2909
2910 iput(inode_alloc_inode);
2911 brelse(alloc_bh);
2912 bail:
2913 mlog_exit(status);
2914 return status;
2915 }
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