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jffs2: use cond_resched() instead of yield()
[linux-2.6/cjktty.git] / fs / ocfs2 / suballoc.c
blob849c2f0e0a0e664e983adf61f620abedf87fcb72
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 while(num_bits--)
1384 ocfs2_set_bit(bit_off++, bitmap);
1385
1386 ocfs2_journal_dirty(handle, group_bh);
1387
1388 bail:
1389 mlog_exit(status);
1390 return status;
1391 }
1392
1393 /* find the one with the most empty bits */
1394 static inline u16 ocfs2_find_victim_chain(struct ocfs2_chain_list *cl)
1395 {
1396 u16 curr, best;
1397
1398 BUG_ON(!cl->cl_next_free_rec);
1399
1400 best = curr = 0;
1401 while (curr < le16_to_cpu(cl->cl_next_free_rec)) {
1402 if (le32_to_cpu(cl->cl_recs[curr].c_free) >
1403 le32_to_cpu(cl->cl_recs[best].c_free))
1404 best = curr;
1405 curr++;
1406 }
1407
1408 BUG_ON(best >= le16_to_cpu(cl->cl_next_free_rec));
1409 return best;
1410 }
1411
1412 static int ocfs2_relink_block_group(handle_t *handle,
1413 struct inode *alloc_inode,
1414 struct buffer_head *fe_bh,
1415 struct buffer_head *bg_bh,
1416 struct buffer_head *prev_bg_bh,
1417 u16 chain)
1418 {
1419 int status;
1420 /* there is a really tiny chance the journal calls could fail,
1421 * but we wouldn't want inconsistent blocks in *any* case. */
1422 u64 fe_ptr, bg_ptr, prev_bg_ptr;
1423 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) fe_bh->b_data;
1424 struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data;
1425 struct ocfs2_group_desc *prev_bg = (struct ocfs2_group_desc *) prev_bg_bh->b_data;
1426
1427 /* The caller got these descriptors from
1428 * ocfs2_read_group_descriptor(). Any corruption is a code bug. */
1429 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
1430 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(prev_bg));
1431
1432 mlog(0, "Suballoc %llu, chain %u, move group %llu to top, prev = %llu\n",
1433 (unsigned long long)le64_to_cpu(fe->i_blkno), chain,
1434 (unsigned long long)le64_to_cpu(bg->bg_blkno),
1435 (unsigned long long)le64_to_cpu(prev_bg->bg_blkno));
1436
1437 fe_ptr = le64_to_cpu(fe->id2.i_chain.cl_recs[chain].c_blkno);
1438 bg_ptr = le64_to_cpu(bg->bg_next_group);
1439 prev_bg_ptr = le64_to_cpu(prev_bg->bg_next_group);
1440
1441 status = ocfs2_journal_access_gd(handle, INODE_CACHE(alloc_inode),
1442 prev_bg_bh,
1443 OCFS2_JOURNAL_ACCESS_WRITE);
1444 if (status < 0) {
1445 mlog_errno(status);
1446 goto out_rollback;
1447 }
1448
1449 prev_bg->bg_next_group = bg->bg_next_group;
1450 ocfs2_journal_dirty(handle, prev_bg_bh);
1451
1452 status = ocfs2_journal_access_gd(handle, INODE_CACHE(alloc_inode),
1453 bg_bh, OCFS2_JOURNAL_ACCESS_WRITE);
1454 if (status < 0) {
1455 mlog_errno(status);
1456 goto out_rollback;
1457 }
1458
1459 bg->bg_next_group = fe->id2.i_chain.cl_recs[chain].c_blkno;
1460 ocfs2_journal_dirty(handle, bg_bh);
1461
1462 status = ocfs2_journal_access_di(handle, INODE_CACHE(alloc_inode),
1463 fe_bh, OCFS2_JOURNAL_ACCESS_WRITE);
1464 if (status < 0) {
1465 mlog_errno(status);
1466 goto out_rollback;
1467 }
1468
1469 fe->id2.i_chain.cl_recs[chain].c_blkno = bg->bg_blkno;
1470 ocfs2_journal_dirty(handle, fe_bh);
1471
1472 out_rollback:
1473 if (status < 0) {
1474 fe->id2.i_chain.cl_recs[chain].c_blkno = cpu_to_le64(fe_ptr);
1475 bg->bg_next_group = cpu_to_le64(bg_ptr);
1476 prev_bg->bg_next_group = cpu_to_le64(prev_bg_ptr);
1477 }
1478
1479 mlog_exit(status);
1480 return status;
1481 }
1482
1483 static inline int ocfs2_block_group_reasonably_empty(struct ocfs2_group_desc *bg,
1484 u32 wanted)
1485 {
1486 return le16_to_cpu(bg->bg_free_bits_count) > wanted;
1487 }
1488
1489 /* return 0 on success, -ENOSPC to keep searching and any other < 0
1490 * value on error. */
1491 static int ocfs2_cluster_group_search(struct inode *inode,
1492 struct buffer_head *group_bh,
1493 u32 bits_wanted, u32 min_bits,
1494 u64 max_block,
1495 struct ocfs2_suballoc_result *res)
1496 {
1497 int search = -ENOSPC;
1498 int ret;
1499 u64 blkoff;
1500 struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *) group_bh->b_data;
1501 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1502 unsigned int max_bits, gd_cluster_off;
1503
1504 BUG_ON(!ocfs2_is_cluster_bitmap(inode));
1505
1506 if (gd->bg_free_bits_count) {
1507 max_bits = le16_to_cpu(gd->bg_bits);
1508
1509 /* Tail groups in cluster bitmaps which aren't cpg
1510 * aligned are prone to partial extention by a failed
1511 * fs resize. If the file system resize never got to
1512 * update the dinode cluster count, then we don't want
1513 * to trust any clusters past it, regardless of what
1514 * the group descriptor says. */
1515 gd_cluster_off = ocfs2_blocks_to_clusters(inode->i_sb,
1516 le64_to_cpu(gd->bg_blkno));
1517 if ((gd_cluster_off + max_bits) >
1518 OCFS2_I(inode)->ip_clusters) {
1519 max_bits = OCFS2_I(inode)->ip_clusters - gd_cluster_off;
1520 mlog(0, "Desc %llu, bg_bits %u, clusters %u, use %u\n",
1521 (unsigned long long)le64_to_cpu(gd->bg_blkno),
1522 le16_to_cpu(gd->bg_bits),
1523 OCFS2_I(inode)->ip_clusters, max_bits);
1524 }
1525
1526 ret = ocfs2_block_group_find_clear_bits(OCFS2_SB(inode->i_sb),
1527 group_bh, bits_wanted,
1528 max_bits, res);
1529 if (ret)
1530 return ret;
1531
1532 if (max_block) {
1533 blkoff = ocfs2_clusters_to_blocks(inode->i_sb,
1534 gd_cluster_off +
1535 res->sr_bit_offset +
1536 res->sr_bits);
1537 mlog(0, "Checking %llu against %llu\n",
1538 (unsigned long long)blkoff,
1539 (unsigned long long)max_block);
1540 if (blkoff > max_block)
1541 return -ENOSPC;
1542 }
1543
1544 /* ocfs2_block_group_find_clear_bits() might
1545 * return success, but we still want to return
1546 * -ENOSPC unless it found the minimum number
1547 * of bits. */
1548 if (min_bits <= res->sr_bits)
1549 search = 0; /* success */
1550 else if (res->sr_bits) {
1551 /*
1552 * Don't show bits which we'll be returning
1553 * for allocation to the local alloc bitmap.
1554 */
1555 ocfs2_local_alloc_seen_free_bits(osb, res->sr_bits);
1556 }
1557 }
1558
1559 return search;
1560 }
1561
1562 static int ocfs2_block_group_search(struct inode *inode,
1563 struct buffer_head *group_bh,
1564 u32 bits_wanted, u32 min_bits,
1565 u64 max_block,
1566 struct ocfs2_suballoc_result *res)
1567 {
1568 int ret = -ENOSPC;
1569 u64 blkoff;
1570 struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) group_bh->b_data;
1571
1572 BUG_ON(min_bits != 1);
1573 BUG_ON(ocfs2_is_cluster_bitmap(inode));
1574
1575 if (bg->bg_free_bits_count) {
1576 ret = ocfs2_block_group_find_clear_bits(OCFS2_SB(inode->i_sb),
1577 group_bh, bits_wanted,
1578 le16_to_cpu(bg->bg_bits),
1579 res);
1580 if (!ret && max_block) {
1581 blkoff = le64_to_cpu(bg->bg_blkno) +
1582 res->sr_bit_offset + res->sr_bits;
1583 mlog(0, "Checking %llu against %llu\n",
1584 (unsigned long long)blkoff,
1585 (unsigned long long)max_block);
1586 if (blkoff > max_block)
1587 ret = -ENOSPC;
1588 }
1589 }
1590
1591 return ret;
1592 }
1593
1594 static int ocfs2_alloc_dinode_update_counts(struct inode *inode,
1595 handle_t *handle,
1596 struct buffer_head *di_bh,
1597 u32 num_bits,
1598 u16 chain)
1599 {
1600 int ret;
1601 u32 tmp_used;
1602 struct ocfs2_dinode *di = (struct ocfs2_dinode *) di_bh->b_data;
1603 struct ocfs2_chain_list *cl = (struct ocfs2_chain_list *) &di->id2.i_chain;
1604
1605 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
1606 OCFS2_JOURNAL_ACCESS_WRITE);
1607 if (ret < 0) {
1608 mlog_errno(ret);
1609 goto out;
1610 }
1611
1612 tmp_used = le32_to_cpu(di->id1.bitmap1.i_used);
1613 di->id1.bitmap1.i_used = cpu_to_le32(num_bits + tmp_used);
1614 le32_add_cpu(&cl->cl_recs[chain].c_free, -num_bits);
1615 ocfs2_journal_dirty(handle, di_bh);
1616
1617 out:
1618 return ret;
1619 }
1620
1621 static int ocfs2_bg_discontig_fix_by_rec(struct ocfs2_suballoc_result *res,
1622 struct ocfs2_extent_rec *rec,
1623 struct ocfs2_chain_list *cl)
1624 {
1625 unsigned int bpc = le16_to_cpu(cl->cl_bpc);
1626 unsigned int bitoff = le32_to_cpu(rec->e_cpos) * bpc;
1627 unsigned int bitcount = le32_to_cpu(rec->e_leaf_clusters) * bpc;
1628
1629 if (res->sr_bit_offset < bitoff)
1630 return 0;
1631 if (res->sr_bit_offset >= (bitoff + bitcount))
1632 return 0;
1633 res->sr_blkno = le64_to_cpu(rec->e_blkno) +
1634 (res->sr_bit_offset - bitoff);
1635 if ((res->sr_bit_offset + res->sr_bits) > (bitoff + bitcount))
1636 res->sr_bits = (bitoff + bitcount) - res->sr_bit_offset;
1637 return 1;
1638 }
1639
1640 static void ocfs2_bg_discontig_fix_result(struct ocfs2_alloc_context *ac,
1641 struct ocfs2_group_desc *bg,
1642 struct ocfs2_suballoc_result *res)
1643 {
1644 int i;
1645 u64 bg_blkno = res->sr_bg_blkno; /* Save off */
1646 struct ocfs2_extent_rec *rec;
1647 struct ocfs2_dinode *di = (struct ocfs2_dinode *)ac->ac_bh->b_data;
1648 struct ocfs2_chain_list *cl = &di->id2.i_chain;
1649
1650 if (ocfs2_is_cluster_bitmap(ac->ac_inode)) {
1651 res->sr_blkno = 0;
1652 return;
1653 }
1654
1655 res->sr_blkno = res->sr_bg_blkno + res->sr_bit_offset;
1656 res->sr_bg_blkno = 0; /* Clear it for contig block groups */
1657 if (!ocfs2_supports_discontig_bg(OCFS2_SB(ac->ac_inode->i_sb)) ||
1658 !bg->bg_list.l_next_free_rec)
1659 return;
1660
1661 for (i = 0; i < le16_to_cpu(bg->bg_list.l_next_free_rec); i++) {
1662 rec = &bg->bg_list.l_recs[i];
1663 if (ocfs2_bg_discontig_fix_by_rec(res, rec, cl)) {
1664 res->sr_bg_blkno = bg_blkno; /* Restore */
1665 break;
1666 }
1667 }
1668 }
1669
1670 static int ocfs2_search_one_group(struct ocfs2_alloc_context *ac,
1671 handle_t *handle,
1672 u32 bits_wanted,
1673 u32 min_bits,
1674 struct ocfs2_suballoc_result *res,
1675 u16 *bits_left)
1676 {
1677 int ret;
1678 struct buffer_head *group_bh = NULL;
1679 struct ocfs2_group_desc *gd;
1680 struct ocfs2_dinode *di = (struct ocfs2_dinode *)ac->ac_bh->b_data;
1681 struct inode *alloc_inode = ac->ac_inode;
1682
1683 ret = ocfs2_read_group_descriptor(alloc_inode, di,
1684 res->sr_bg_blkno, &group_bh);
1685 if (ret < 0) {
1686 mlog_errno(ret);
1687 return ret;
1688 }
1689
1690 gd = (struct ocfs2_group_desc *) group_bh->b_data;
1691 ret = ac->ac_group_search(alloc_inode, group_bh, bits_wanted, min_bits,
1692 ac->ac_max_block, res);
1693 if (ret < 0) {
1694 if (ret != -ENOSPC)
1695 mlog_errno(ret);
1696 goto out;
1697 }
1698
1699 if (!ret)
1700 ocfs2_bg_discontig_fix_result(ac, gd, res);
1701
1702 /*
1703 * sr_bg_blkno might have been changed by
1704 * ocfs2_bg_discontig_fix_result
1705 */
1706 res->sr_bg_stable_blkno = group_bh->b_blocknr;
1707
1708 if (ac->ac_find_loc_only)
1709 goto out_loc_only;
1710
1711 ret = ocfs2_alloc_dinode_update_counts(alloc_inode, handle, ac->ac_bh,
1712 res->sr_bits,
1713 le16_to_cpu(gd->bg_chain));
1714 if (ret < 0) {
1715 mlog_errno(ret);
1716 goto out;
1717 }
1718
1719 ret = ocfs2_block_group_set_bits(handle, alloc_inode, gd, group_bh,
1720 res->sr_bit_offset, res->sr_bits);
1721 if (ret < 0)
1722 mlog_errno(ret);
1723
1724 out_loc_only:
1725 *bits_left = le16_to_cpu(gd->bg_free_bits_count);
1726
1727 out:
1728 brelse(group_bh);
1729
1730 return ret;
1731 }
1732
1733 static int ocfs2_search_chain(struct ocfs2_alloc_context *ac,
1734 handle_t *handle,
1735 u32 bits_wanted,
1736 u32 min_bits,
1737 struct ocfs2_suballoc_result *res,
1738 u16 *bits_left)
1739 {
1740 int status;
1741 u16 chain;
1742 u64 next_group;
1743 struct inode *alloc_inode = ac->ac_inode;
1744 struct buffer_head *group_bh = NULL;
1745 struct buffer_head *prev_group_bh = NULL;
1746 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) ac->ac_bh->b_data;
1747 struct ocfs2_chain_list *cl = (struct ocfs2_chain_list *) &fe->id2.i_chain;
1748 struct ocfs2_group_desc *bg;
1749
1750 chain = ac->ac_chain;
1751 mlog(0, "trying to alloc %u bits from chain %u, inode %llu\n",
1752 bits_wanted, chain,
1753 (unsigned long long)OCFS2_I(alloc_inode)->ip_blkno);
1754
1755 status = ocfs2_read_group_descriptor(alloc_inode, fe,
1756 le64_to_cpu(cl->cl_recs[chain].c_blkno),
1757 &group_bh);
1758 if (status < 0) {
1759 mlog_errno(status);
1760 goto bail;
1761 }
1762 bg = (struct ocfs2_group_desc *) group_bh->b_data;
1763
1764 status = -ENOSPC;
1765 /* for now, the chain search is a bit simplistic. We just use
1766 * the 1st group with any empty bits. */
1767 while ((status = ac->ac_group_search(alloc_inode, group_bh,
1768 bits_wanted, min_bits,
1769 ac->ac_max_block,
1770 res)) == -ENOSPC) {
1771 if (!bg->bg_next_group)
1772 break;
1773
1774 brelse(prev_group_bh);
1775 prev_group_bh = NULL;
1776
1777 next_group = le64_to_cpu(bg->bg_next_group);
1778 prev_group_bh = group_bh;
1779 group_bh = NULL;
1780 status = ocfs2_read_group_descriptor(alloc_inode, fe,
1781 next_group, &group_bh);
1782 if (status < 0) {
1783 mlog_errno(status);
1784 goto bail;
1785 }
1786 bg = (struct ocfs2_group_desc *) group_bh->b_data;
1787 }
1788 if (status < 0) {
1789 if (status != -ENOSPC)
1790 mlog_errno(status);
1791 goto bail;
1792 }
1793
1794 mlog(0, "alloc succeeds: we give %u bits from block group %llu\n",
1795 res->sr_bits, (unsigned long long)le64_to_cpu(bg->bg_blkno));
1796
1797 res->sr_bg_blkno = le64_to_cpu(bg->bg_blkno);
1798
1799 BUG_ON(res->sr_bits == 0);
1800 if (!status)
1801 ocfs2_bg_discontig_fix_result(ac, bg, res);
1802
1803 /*
1804 * sr_bg_blkno might have been changed by
1805 * ocfs2_bg_discontig_fix_result
1806 */
1807 res->sr_bg_stable_blkno = group_bh->b_blocknr;
1808
1809 /*
1810 * Keep track of previous block descriptor read. When
1811 * we find a target, if we have read more than X
1812 * number of descriptors, and the target is reasonably
1813 * empty, relink him to top of his chain.
1814 *
1815 * We've read 0 extra blocks and only send one more to
1816 * the transaction, yet the next guy to search has a
1817 * much easier time.
1818 *
1819 * Do this *after* figuring out how many bits we're taking out
1820 * of our target group.
1821 */
1822 if (ac->ac_allow_chain_relink &&
1823 (prev_group_bh) &&
1824 (ocfs2_block_group_reasonably_empty(bg, res->sr_bits))) {
1825 status = ocfs2_relink_block_group(handle, alloc_inode,
1826 ac->ac_bh, group_bh,
1827 prev_group_bh, chain);
1828 if (status < 0) {
1829 mlog_errno(status);
1830 goto bail;
1831 }
1832 }
1833
1834 if (ac->ac_find_loc_only)
1835 goto out_loc_only;
1836
1837 status = ocfs2_alloc_dinode_update_counts(alloc_inode, handle,
1838 ac->ac_bh, res->sr_bits,
1839 chain);
1840 if (status) {
1841 mlog_errno(status);
1842 goto bail;
1843 }
1844
1845 status = ocfs2_block_group_set_bits(handle,
1846 alloc_inode,
1847 bg,
1848 group_bh,
1849 res->sr_bit_offset,
1850 res->sr_bits);
1851 if (status < 0) {
1852 mlog_errno(status);
1853 goto bail;
1854 }
1855
1856 mlog(0, "Allocated %u bits from suballocator %llu\n", res->sr_bits,
1857 (unsigned long long)le64_to_cpu(fe->i_blkno));
1858
1859 out_loc_only:
1860 *bits_left = le16_to_cpu(bg->bg_free_bits_count);
1861 bail:
1862 brelse(group_bh);
1863 brelse(prev_group_bh);
1864
1865 mlog_exit(status);
1866 return status;
1867 }
1868
1869 /* will give out up to bits_wanted contiguous bits. */
1870 static int ocfs2_claim_suballoc_bits(struct ocfs2_alloc_context *ac,
1871 handle_t *handle,
1872 u32 bits_wanted,
1873 u32 min_bits,
1874 struct ocfs2_suballoc_result *res)
1875 {
1876 int status;
1877 u16 victim, i;
1878 u16 bits_left = 0;
1879 u64 hint = ac->ac_last_group;
1880 struct ocfs2_chain_list *cl;
1881 struct ocfs2_dinode *fe;
1882
1883 mlog_entry_void();
1884
1885 BUG_ON(ac->ac_bits_given >= ac->ac_bits_wanted);
1886 BUG_ON(bits_wanted > (ac->ac_bits_wanted - ac->ac_bits_given));
1887 BUG_ON(!ac->ac_bh);
1888
1889 fe = (struct ocfs2_dinode *) ac->ac_bh->b_data;
1890
1891 /* The bh was validated by the inode read during
1892 * ocfs2_reserve_suballoc_bits(). Any corruption is a code bug. */
1893 BUG_ON(!OCFS2_IS_VALID_DINODE(fe));
1894
1895 if (le32_to_cpu(fe->id1.bitmap1.i_used) >=
1896 le32_to_cpu(fe->id1.bitmap1.i_total)) {
1897 ocfs2_error(ac->ac_inode->i_sb,
1898 "Chain allocator dinode %llu has %u used "
1899 "bits but only %u total.",
1900 (unsigned long long)le64_to_cpu(fe->i_blkno),
1901 le32_to_cpu(fe->id1.bitmap1.i_used),
1902 le32_to_cpu(fe->id1.bitmap1.i_total));
1903 status = -EIO;
1904 goto bail;
1905 }
1906
1907 res->sr_bg_blkno = hint;
1908 if (res->sr_bg_blkno) {
1909 /* Attempt to short-circuit the usual search mechanism
1910 * by jumping straight to the most recently used
1911 * allocation group. This helps us mantain some
1912 * contiguousness across allocations. */
1913 status = ocfs2_search_one_group(ac, handle, bits_wanted,
1914 min_bits, res, &bits_left);
1915 if (!status)
1916 goto set_hint;
1917 if (status < 0 && status != -ENOSPC) {
1918 mlog_errno(status);
1919 goto bail;
1920 }
1921 }
1922
1923 cl = (struct ocfs2_chain_list *) &fe->id2.i_chain;
1924
1925 victim = ocfs2_find_victim_chain(cl);
1926 ac->ac_chain = victim;
1927 ac->ac_allow_chain_relink = 1;
1928
1929 status = ocfs2_search_chain(ac, handle, bits_wanted, min_bits,
1930 res, &bits_left);
1931 if (!status) {
1932 hint = ocfs2_group_from_res(res);
1933 goto set_hint;
1934 }
1935 if (status < 0 && status != -ENOSPC) {
1936 mlog_errno(status);
1937 goto bail;
1938 }
1939
1940 mlog(0, "Search of victim chain %u came up with nothing, "
1941 "trying all chains now.\n", victim);
1942
1943 /* If we didn't pick a good victim, then just default to
1944 * searching each chain in order. Don't allow chain relinking
1945 * because we only calculate enough journal credits for one
1946 * relink per alloc. */
1947 ac->ac_allow_chain_relink = 0;
1948 for (i = 0; i < le16_to_cpu(cl->cl_next_free_rec); i ++) {
1949 if (i == victim)
1950 continue;
1951 if (!cl->cl_recs[i].c_free)
1952 continue;
1953
1954 ac->ac_chain = i;
1955 status = ocfs2_search_chain(ac, handle, bits_wanted, min_bits,
1956 res, &bits_left);
1957 if (!status) {
1958 hint = ocfs2_group_from_res(res);
1959 break;
1960 }
1961 if (status < 0 && status != -ENOSPC) {
1962 mlog_errno(status);
1963 goto bail;
1964 }
1965 }
1966
1967 set_hint:
1968 if (status != -ENOSPC) {
1969 /* If the next search of this group is not likely to
1970 * yield a suitable extent, then we reset the last
1971 * group hint so as to not waste a disk read */
1972 if (bits_left < min_bits)
1973 ac->ac_last_group = 0;
1974 else
1975 ac->ac_last_group = hint;
1976 }
1977
1978 bail:
1979 mlog_exit(status);
1980 return status;
1981 }
1982
1983 int ocfs2_claim_metadata(handle_t *handle,
1984 struct ocfs2_alloc_context *ac,
1985 u32 bits_wanted,
1986 u64 *suballoc_loc,
1987 u16 *suballoc_bit_start,
1988 unsigned int *num_bits,
1989 u64 *blkno_start)
1990 {
1991 int status;
1992 struct ocfs2_suballoc_result res = { .sr_blkno = 0, };
1993
1994 BUG_ON(!ac);
1995 BUG_ON(ac->ac_bits_wanted < (ac->ac_bits_given + bits_wanted));
1996 BUG_ON(ac->ac_which != OCFS2_AC_USE_META);
1997
1998 status = ocfs2_claim_suballoc_bits(ac,
1999 handle,
2000 bits_wanted,
2001 1,
2002 &res);
2003 if (status < 0) {
2004 mlog_errno(status);
2005 goto bail;
2006 }
2007 atomic_inc(&OCFS2_SB(ac->ac_inode->i_sb)->alloc_stats.bg_allocs);
2008
2009 *suballoc_loc = res.sr_bg_blkno;
2010 *suballoc_bit_start = res.sr_bit_offset;
2011 *blkno_start = res.sr_blkno;
2012 ac->ac_bits_given += res.sr_bits;
2013 *num_bits = res.sr_bits;
2014 status = 0;
2015 bail:
2016 mlog_exit(status);
2017 return status;
2018 }
2019
2020 static void ocfs2_init_inode_ac_group(struct inode *dir,
2021 struct buffer_head *parent_di_bh,
2022 struct ocfs2_alloc_context *ac)
2023 {
2024 struct ocfs2_dinode *di = (struct ocfs2_dinode *)parent_di_bh->b_data;
2025 /*
2026 * Try to allocate inodes from some specific group.
2027 *
2028 * If the parent dir has recorded the last group used in allocation,
2029 * cool, use it. Otherwise if we try to allocate new inode from the
2030 * same slot the parent dir belongs to, use the same chunk.
2031 *
2032 * We are very careful here to avoid the mistake of setting
2033 * ac_last_group to a group descriptor from a different (unlocked) slot.
2034 */
2035 if (OCFS2_I(dir)->ip_last_used_group &&
2036 OCFS2_I(dir)->ip_last_used_slot == ac->ac_alloc_slot)
2037 ac->ac_last_group = OCFS2_I(dir)->ip_last_used_group;
2038 else if (le16_to_cpu(di->i_suballoc_slot) == ac->ac_alloc_slot) {
2039 if (di->i_suballoc_loc)
2040 ac->ac_last_group = le64_to_cpu(di->i_suballoc_loc);
2041 else
2042 ac->ac_last_group = ocfs2_which_suballoc_group(
2043 le64_to_cpu(di->i_blkno),
2044 le16_to_cpu(di->i_suballoc_bit));
2045 }
2046 }
2047
2048 static inline void ocfs2_save_inode_ac_group(struct inode *dir,
2049 struct ocfs2_alloc_context *ac)
2050 {
2051 OCFS2_I(dir)->ip_last_used_group = ac->ac_last_group;
2052 OCFS2_I(dir)->ip_last_used_slot = ac->ac_alloc_slot;
2053 }
2054
2055 int ocfs2_find_new_inode_loc(struct inode *dir,
2056 struct buffer_head *parent_fe_bh,
2057 struct ocfs2_alloc_context *ac,
2058 u64 *fe_blkno)
2059 {
2060 int ret;
2061 handle_t *handle = NULL;
2062 struct ocfs2_suballoc_result *res;
2063
2064 BUG_ON(!ac);
2065 BUG_ON(ac->ac_bits_given != 0);
2066 BUG_ON(ac->ac_bits_wanted != 1);
2067 BUG_ON(ac->ac_which != OCFS2_AC_USE_INODE);
2068
2069 res = kzalloc(sizeof(*res), GFP_NOFS);
2070 if (res == NULL) {
2071 ret = -ENOMEM;
2072 mlog_errno(ret);
2073 goto out;
2074 }
2075
2076 ocfs2_init_inode_ac_group(dir, parent_fe_bh, ac);
2077
2078 /*
2079 * The handle started here is for chain relink. Alternatively,
2080 * we could just disable relink for these calls.
2081 */
2082 handle = ocfs2_start_trans(OCFS2_SB(dir->i_sb), OCFS2_SUBALLOC_ALLOC);
2083 if (IS_ERR(handle)) {
2084 ret = PTR_ERR(handle);
2085 handle = NULL;
2086 mlog_errno(ret);
2087 goto out;
2088 }
2089
2090 /*
2091 * This will instruct ocfs2_claim_suballoc_bits and
2092 * ocfs2_search_one_group to search but save actual allocation
2093 * for later.
2094 */
2095 ac->ac_find_loc_only = 1;
2096
2097 ret = ocfs2_claim_suballoc_bits(ac, handle, 1, 1, res);
2098 if (ret < 0) {
2099 mlog_errno(ret);
2100 goto out;
2101 }
2102
2103 ac->ac_find_loc_priv = res;
2104 *fe_blkno = res->sr_blkno;
2105
2106 out:
2107 if (handle)
2108 ocfs2_commit_trans(OCFS2_SB(dir->i_sb), handle);
2109
2110 if (ret)
2111 kfree(res);
2112
2113 return ret;
2114 }
2115
2116 int ocfs2_claim_new_inode_at_loc(handle_t *handle,
2117 struct inode *dir,
2118 struct ocfs2_alloc_context *ac,
2119 u64 *suballoc_loc,
2120 u16 *suballoc_bit,
2121 u64 di_blkno)
2122 {
2123 int ret;
2124 u16 chain;
2125 struct ocfs2_suballoc_result *res = ac->ac_find_loc_priv;
2126 struct buffer_head *bg_bh = NULL;
2127 struct ocfs2_group_desc *bg;
2128 struct ocfs2_dinode *di = (struct ocfs2_dinode *) ac->ac_bh->b_data;
2129
2130 /*
2131 * Since di_blkno is being passed back in, we check for any
2132 * inconsistencies which may have happened between
2133 * calls. These are code bugs as di_blkno is not expected to
2134 * change once returned from ocfs2_find_new_inode_loc()
2135 */
2136 BUG_ON(res->sr_blkno != di_blkno);
2137
2138 ret = ocfs2_read_group_descriptor(ac->ac_inode, di,
2139 res->sr_bg_stable_blkno, &bg_bh);
2140 if (ret) {
2141 mlog_errno(ret);
2142 goto out;
2143 }
2144
2145 bg = (struct ocfs2_group_desc *) bg_bh->b_data;
2146 chain = le16_to_cpu(bg->bg_chain);
2147
2148 ret = ocfs2_alloc_dinode_update_counts(ac->ac_inode, handle,
2149 ac->ac_bh, res->sr_bits,
2150 chain);
2151 if (ret) {
2152 mlog_errno(ret);
2153 goto out;
2154 }
2155
2156 ret = ocfs2_block_group_set_bits(handle,
2157 ac->ac_inode,
2158 bg,
2159 bg_bh,
2160 res->sr_bit_offset,
2161 res->sr_bits);
2162 if (ret < 0) {
2163 mlog_errno(ret);
2164 goto out;
2165 }
2166
2167 mlog(0, "Allocated %u bits from suballocator %llu\n", res->sr_bits,
2168 (unsigned long long)di_blkno);
2169
2170 atomic_inc(&OCFS2_SB(ac->ac_inode->i_sb)->alloc_stats.bg_allocs);
2171
2172 BUG_ON(res->sr_bits != 1);
2173
2174 *suballoc_loc = res->sr_bg_blkno;
2175 *suballoc_bit = res->sr_bit_offset;
2176 ac->ac_bits_given++;
2177 ocfs2_save_inode_ac_group(dir, ac);
2178
2179 out:
2180 brelse(bg_bh);
2181
2182 return ret;
2183 }
2184
2185 int ocfs2_claim_new_inode(handle_t *handle,
2186 struct inode *dir,
2187 struct buffer_head *parent_fe_bh,
2188 struct ocfs2_alloc_context *ac,
2189 u64 *suballoc_loc,
2190 u16 *suballoc_bit,
2191 u64 *fe_blkno)
2192 {
2193 int status;
2194 struct ocfs2_suballoc_result res;
2195
2196 mlog_entry_void();
2197
2198 BUG_ON(!ac);
2199 BUG_ON(ac->ac_bits_given != 0);
2200 BUG_ON(ac->ac_bits_wanted != 1);
2201 BUG_ON(ac->ac_which != OCFS2_AC_USE_INODE);
2202
2203 ocfs2_init_inode_ac_group(dir, parent_fe_bh, ac);
2204
2205 status = ocfs2_claim_suballoc_bits(ac,
2206 handle,
2207 1,
2208 1,
2209 &res);
2210 if (status < 0) {
2211 mlog_errno(status);
2212 goto bail;
2213 }
2214 atomic_inc(&OCFS2_SB(ac->ac_inode->i_sb)->alloc_stats.bg_allocs);
2215
2216 BUG_ON(res.sr_bits != 1);
2217
2218 *suballoc_loc = res.sr_bg_blkno;
2219 *suballoc_bit = res.sr_bit_offset;
2220 *fe_blkno = res.sr_blkno;
2221 ac->ac_bits_given++;
2222 ocfs2_save_inode_ac_group(dir, ac);
2223 status = 0;
2224 bail:
2225 mlog_exit(status);
2226 return status;
2227 }
2228
2229 /* translate a group desc. blkno and it's bitmap offset into
2230 * disk cluster offset. */
2231 static inline u32 ocfs2_desc_bitmap_to_cluster_off(struct inode *inode,
2232 u64 bg_blkno,
2233 u16 bg_bit_off)
2234 {
2235 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2236 u32 cluster = 0;
2237
2238 BUG_ON(!ocfs2_is_cluster_bitmap(inode));
2239
2240 if (bg_blkno != osb->first_cluster_group_blkno)
2241 cluster = ocfs2_blocks_to_clusters(inode->i_sb, bg_blkno);
2242 cluster += (u32) bg_bit_off;
2243 return cluster;
2244 }
2245
2246 /* given a cluster offset, calculate which block group it belongs to
2247 * and return that block offset. */
2248 u64 ocfs2_which_cluster_group(struct inode *inode, u32 cluster)
2249 {
2250 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2251 u32 group_no;
2252
2253 BUG_ON(!ocfs2_is_cluster_bitmap(inode));
2254
2255 group_no = cluster / osb->bitmap_cpg;
2256 if (!group_no)
2257 return osb->first_cluster_group_blkno;
2258 return ocfs2_clusters_to_blocks(inode->i_sb,
2259 group_no * osb->bitmap_cpg);
2260 }
2261
2262 /* given the block number of a cluster start, calculate which cluster
2263 * group and descriptor bitmap offset that corresponds to. */
2264 static inline void ocfs2_block_to_cluster_group(struct inode *inode,
2265 u64 data_blkno,
2266 u64 *bg_blkno,
2267 u16 *bg_bit_off)
2268 {
2269 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2270 u32 data_cluster = ocfs2_blocks_to_clusters(osb->sb, data_blkno);
2271
2272 BUG_ON(!ocfs2_is_cluster_bitmap(inode));
2273
2274 *bg_blkno = ocfs2_which_cluster_group(inode,
2275 data_cluster);
2276
2277 if (*bg_blkno == osb->first_cluster_group_blkno)
2278 *bg_bit_off = (u16) data_cluster;
2279 else
2280 *bg_bit_off = (u16) ocfs2_blocks_to_clusters(osb->sb,
2281 data_blkno - *bg_blkno);
2282 }
2283
2284 /*
2285 * min_bits - minimum contiguous chunk from this total allocation we
2286 * can handle. set to what we asked for originally for a full
2287 * contig. allocation, set to '1' to indicate we can deal with extents
2288 * of any size.
2289 */
2290 int __ocfs2_claim_clusters(handle_t *handle,
2291 struct ocfs2_alloc_context *ac,
2292 u32 min_clusters,
2293 u32 max_clusters,
2294 u32 *cluster_start,
2295 u32 *num_clusters)
2296 {
2297 int status;
2298 unsigned int bits_wanted = max_clusters;
2299 struct ocfs2_suballoc_result res = { .sr_blkno = 0, };
2300 struct ocfs2_super *osb = OCFS2_SB(ac->ac_inode->i_sb);
2301
2302 mlog_entry_void();
2303
2304 BUG_ON(ac->ac_bits_given >= ac->ac_bits_wanted);
2305
2306 BUG_ON(ac->ac_which != OCFS2_AC_USE_LOCAL
2307 && ac->ac_which != OCFS2_AC_USE_MAIN);
2308
2309 if (ac->ac_which == OCFS2_AC_USE_LOCAL) {
2310 WARN_ON(min_clusters > 1);
2311
2312 status = ocfs2_claim_local_alloc_bits(osb,
2313 handle,
2314 ac,
2315 bits_wanted,
2316 cluster_start,
2317 num_clusters);
2318 if (!status)
2319 atomic_inc(&osb->alloc_stats.local_data);
2320 } else {
2321 if (min_clusters > (osb->bitmap_cpg - 1)) {
2322 /* The only paths asking for contiguousness
2323 * should know about this already. */
2324 mlog(ML_ERROR, "minimum allocation requested %u exceeds "
2325 "group bitmap size %u!\n", min_clusters,
2326 osb->bitmap_cpg);
2327 status = -ENOSPC;
2328 goto bail;
2329 }
2330 /* clamp the current request down to a realistic size. */
2331 if (bits_wanted > (osb->bitmap_cpg - 1))
2332 bits_wanted = osb->bitmap_cpg - 1;
2333
2334 status = ocfs2_claim_suballoc_bits(ac,
2335 handle,
2336 bits_wanted,
2337 min_clusters,
2338 &res);
2339 if (!status) {
2340 BUG_ON(res.sr_blkno); /* cluster alloc can't set */
2341 *cluster_start =
2342 ocfs2_desc_bitmap_to_cluster_off(ac->ac_inode,
2343 res.sr_bg_blkno,
2344 res.sr_bit_offset);
2345 atomic_inc(&osb->alloc_stats.bitmap_data);
2346 *num_clusters = res.sr_bits;
2347 }
2348 }
2349 if (status < 0) {
2350 if (status != -ENOSPC)
2351 mlog_errno(status);
2352 goto bail;
2353 }
2354
2355 ac->ac_bits_given += *num_clusters;
2356
2357 bail:
2358 mlog_exit(status);
2359 return status;
2360 }
2361
2362 int ocfs2_claim_clusters(handle_t *handle,
2363 struct ocfs2_alloc_context *ac,
2364 u32 min_clusters,
2365 u32 *cluster_start,
2366 u32 *num_clusters)
2367 {
2368 unsigned int bits_wanted = ac->ac_bits_wanted - ac->ac_bits_given;
2369
2370 return __ocfs2_claim_clusters(handle, ac, min_clusters,
2371 bits_wanted, cluster_start, num_clusters);
2372 }
2373
2374 static int ocfs2_block_group_clear_bits(handle_t *handle,
2375 struct inode *alloc_inode,
2376 struct ocfs2_group_desc *bg,
2377 struct buffer_head *group_bh,
2378 unsigned int bit_off,
2379 unsigned int num_bits,
2380 void (*undo_fn)(unsigned int bit,
2381 unsigned long *bmap))
2382 {
2383 int status;
2384 unsigned int tmp;
2385 struct ocfs2_group_desc *undo_bg = NULL;
2386
2387 mlog_entry_void();
2388
2389 /* The caller got this descriptor from
2390 * ocfs2_read_group_descriptor(). Any corruption is a code bug. */
2391 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
2392
2393 mlog(0, "off = %u, num = %u\n", bit_off, num_bits);
2394
2395 BUG_ON(undo_fn && !ocfs2_is_cluster_bitmap(alloc_inode));
2396 status = ocfs2_journal_access_gd(handle, INODE_CACHE(alloc_inode),
2397 group_bh,
2398 undo_fn ?
2399 OCFS2_JOURNAL_ACCESS_UNDO :
2400 OCFS2_JOURNAL_ACCESS_WRITE);
2401 if (status < 0) {
2402 mlog_errno(status);
2403 goto bail;
2404 }
2405
2406 if (undo_fn) {
2407 jbd_lock_bh_state(group_bh);
2408 undo_bg = (struct ocfs2_group_desc *)
2409 bh2jh(group_bh)->b_committed_data;
2410 BUG_ON(!undo_bg);
2411 }
2412
2413 tmp = num_bits;
2414 while(tmp--) {
2415 ocfs2_clear_bit((bit_off + tmp),
2416 (unsigned long *) bg->bg_bitmap);
2417 if (undo_fn)
2418 undo_fn(bit_off + tmp,
2419 (unsigned long *) undo_bg->bg_bitmap);
2420 }
2421 le16_add_cpu(&bg->bg_free_bits_count, num_bits);
2422
2423 if (undo_fn)
2424 jbd_unlock_bh_state(group_bh);
2425
2426 ocfs2_journal_dirty(handle, group_bh);
2427 bail:
2428 return status;
2429 }
2430
2431 /*
2432 * expects the suballoc inode to already be locked.
2433 */
2434 static int _ocfs2_free_suballoc_bits(handle_t *handle,
2435 struct inode *alloc_inode,
2436 struct buffer_head *alloc_bh,
2437 unsigned int start_bit,
2438 u64 bg_blkno,
2439 unsigned int count,
2440 void (*undo_fn)(unsigned int bit,
2441 unsigned long *bitmap))
2442 {
2443 int status = 0;
2444 u32 tmp_used;
2445 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) alloc_bh->b_data;
2446 struct ocfs2_chain_list *cl = &fe->id2.i_chain;
2447 struct buffer_head *group_bh = NULL;
2448 struct ocfs2_group_desc *group;
2449
2450 mlog_entry_void();
2451
2452 /* The alloc_bh comes from ocfs2_free_dinode() or
2453 * ocfs2_free_clusters(). The callers have all locked the
2454 * allocator and gotten alloc_bh from the lock call. This
2455 * validates the dinode buffer. Any corruption that has happended
2456 * is a code bug. */
2457 BUG_ON(!OCFS2_IS_VALID_DINODE(fe));
2458 BUG_ON((count + start_bit) > ocfs2_bits_per_group(cl));
2459
2460 mlog(0, "%llu: freeing %u bits from group %llu, starting at %u\n",
2461 (unsigned long long)OCFS2_I(alloc_inode)->ip_blkno, count,
2462 (unsigned long long)bg_blkno, start_bit);
2463
2464 status = ocfs2_read_group_descriptor(alloc_inode, fe, bg_blkno,
2465 &group_bh);
2466 if (status < 0) {
2467 mlog_errno(status);
2468 goto bail;
2469 }
2470 group = (struct ocfs2_group_desc *) group_bh->b_data;
2471
2472 BUG_ON((count + start_bit) > le16_to_cpu(group->bg_bits));
2473
2474 status = ocfs2_block_group_clear_bits(handle, alloc_inode,
2475 group, group_bh,
2476 start_bit, count, undo_fn);
2477 if (status < 0) {
2478 mlog_errno(status);
2479 goto bail;
2480 }
2481
2482 status = ocfs2_journal_access_di(handle, INODE_CACHE(alloc_inode),
2483 alloc_bh, OCFS2_JOURNAL_ACCESS_WRITE);
2484 if (status < 0) {
2485 mlog_errno(status);
2486 goto bail;
2487 }
2488
2489 le32_add_cpu(&cl->cl_recs[le16_to_cpu(group->bg_chain)].c_free,
2490 count);
2491 tmp_used = le32_to_cpu(fe->id1.bitmap1.i_used);
2492 fe->id1.bitmap1.i_used = cpu_to_le32(tmp_used - count);
2493 ocfs2_journal_dirty(handle, alloc_bh);
2494
2495 bail:
2496 brelse(group_bh);
2497
2498 mlog_exit(status);
2499 return status;
2500 }
2501
2502 int ocfs2_free_suballoc_bits(handle_t *handle,
2503 struct inode *alloc_inode,
2504 struct buffer_head *alloc_bh,
2505 unsigned int start_bit,
2506 u64 bg_blkno,
2507 unsigned int count)
2508 {
2509 return _ocfs2_free_suballoc_bits(handle, alloc_inode, alloc_bh,
2510 start_bit, bg_blkno, count, NULL);
2511 }
2512
2513 int ocfs2_free_dinode(handle_t *handle,
2514 struct inode *inode_alloc_inode,
2515 struct buffer_head *inode_alloc_bh,
2516 struct ocfs2_dinode *di)
2517 {
2518 u64 blk = le64_to_cpu(di->i_blkno);
2519 u16 bit = le16_to_cpu(di->i_suballoc_bit);
2520 u64 bg_blkno = ocfs2_which_suballoc_group(blk, bit);
2521
2522 if (di->i_suballoc_loc)
2523 bg_blkno = le64_to_cpu(di->i_suballoc_loc);
2524 return ocfs2_free_suballoc_bits(handle, inode_alloc_inode,
2525 inode_alloc_bh, bit, bg_blkno, 1);
2526 }
2527
2528 static int _ocfs2_free_clusters(handle_t *handle,
2529 struct inode *bitmap_inode,
2530 struct buffer_head *bitmap_bh,
2531 u64 start_blk,
2532 unsigned int num_clusters,
2533 void (*undo_fn)(unsigned int bit,
2534 unsigned long *bitmap))
2535 {
2536 int status;
2537 u16 bg_start_bit;
2538 u64 bg_blkno;
2539 struct ocfs2_dinode *fe;
2540
2541 /* You can't ever have a contiguous set of clusters
2542 * bigger than a block group bitmap so we never have to worry
2543 * about looping on them. */
2544
2545 mlog_entry_void();
2546
2547 /* This is expensive. We can safely remove once this stuff has
2548 * gotten tested really well. */
2549 BUG_ON(start_blk != ocfs2_clusters_to_blocks(bitmap_inode->i_sb, ocfs2_blocks_to_clusters(bitmap_inode->i_sb, start_blk)));
2550
2551 fe = (struct ocfs2_dinode *) bitmap_bh->b_data;
2552
2553 ocfs2_block_to_cluster_group(bitmap_inode, start_blk, &bg_blkno,
2554 &bg_start_bit);
2555
2556 mlog(0, "want to free %u clusters starting at block %llu\n",
2557 num_clusters, (unsigned long long)start_blk);
2558 mlog(0, "bg_blkno = %llu, bg_start_bit = %u\n",
2559 (unsigned long long)bg_blkno, bg_start_bit);
2560
2561 status = _ocfs2_free_suballoc_bits(handle, bitmap_inode, bitmap_bh,
2562 bg_start_bit, bg_blkno,
2563 num_clusters, undo_fn);
2564 if (status < 0) {
2565 mlog_errno(status);
2566 goto out;
2567 }
2568
2569 ocfs2_local_alloc_seen_free_bits(OCFS2_SB(bitmap_inode->i_sb),
2570 num_clusters);
2571
2572 out:
2573 mlog_exit(status);
2574 return status;
2575 }
2576
2577 int ocfs2_free_clusters(handle_t *handle,
2578 struct inode *bitmap_inode,
2579 struct buffer_head *bitmap_bh,
2580 u64 start_blk,
2581 unsigned int num_clusters)
2582 {
2583 return _ocfs2_free_clusters(handle, bitmap_inode, bitmap_bh,
2584 start_blk, num_clusters,
2585 _ocfs2_set_bit);
2586 }
2587
2588 /*
2589 * Give never-used clusters back to the global bitmap. We don't need
2590 * to protect these bits in the undo buffer.
2591 */
2592 int ocfs2_release_clusters(handle_t *handle,
2593 struct inode *bitmap_inode,
2594 struct buffer_head *bitmap_bh,
2595 u64 start_blk,
2596 unsigned int num_clusters)
2597 {
2598 return _ocfs2_free_clusters(handle, bitmap_inode, bitmap_bh,
2599 start_blk, num_clusters,
2600 _ocfs2_clear_bit);
2601 }
2602
2603 static inline void ocfs2_debug_bg(struct ocfs2_group_desc *bg)
2604 {
2605 printk("Block Group:\n");
2606 printk("bg_signature: %s\n", bg->bg_signature);
2607 printk("bg_size: %u\n", bg->bg_size);
2608 printk("bg_bits: %u\n", bg->bg_bits);
2609 printk("bg_free_bits_count: %u\n", bg->bg_free_bits_count);
2610 printk("bg_chain: %u\n", bg->bg_chain);
2611 printk("bg_generation: %u\n", le32_to_cpu(bg->bg_generation));
2612 printk("bg_next_group: %llu\n",
2613 (unsigned long long)bg->bg_next_group);
2614 printk("bg_parent_dinode: %llu\n",
2615 (unsigned long long)bg->bg_parent_dinode);
2616 printk("bg_blkno: %llu\n",
2617 (unsigned long long)bg->bg_blkno);
2618 }
2619
2620 static inline void ocfs2_debug_suballoc_inode(struct ocfs2_dinode *fe)
2621 {
2622 int i;
2623
2624 printk("Suballoc Inode %llu:\n", (unsigned long long)fe->i_blkno);
2625 printk("i_signature: %s\n", fe->i_signature);
2626 printk("i_size: %llu\n",
2627 (unsigned long long)fe->i_size);
2628 printk("i_clusters: %u\n", fe->i_clusters);
2629 printk("i_generation: %u\n",
2630 le32_to_cpu(fe->i_generation));
2631 printk("id1.bitmap1.i_used: %u\n",
2632 le32_to_cpu(fe->id1.bitmap1.i_used));
2633 printk("id1.bitmap1.i_total: %u\n",
2634 le32_to_cpu(fe->id1.bitmap1.i_total));
2635 printk("id2.i_chain.cl_cpg: %u\n", fe->id2.i_chain.cl_cpg);
2636 printk("id2.i_chain.cl_bpc: %u\n", fe->id2.i_chain.cl_bpc);
2637 printk("id2.i_chain.cl_count: %u\n", fe->id2.i_chain.cl_count);
2638 printk("id2.i_chain.cl_next_free_rec: %u\n",
2639 fe->id2.i_chain.cl_next_free_rec);
2640 for(i = 0; i < fe->id2.i_chain.cl_next_free_rec; i++) {
2641 printk("fe->id2.i_chain.cl_recs[%d].c_free: %u\n", i,
2642 fe->id2.i_chain.cl_recs[i].c_free);
2643 printk("fe->id2.i_chain.cl_recs[%d].c_total: %u\n", i,
2644 fe->id2.i_chain.cl_recs[i].c_total);
2645 printk("fe->id2.i_chain.cl_recs[%d].c_blkno: %llu\n", i,
2646 (unsigned long long)fe->id2.i_chain.cl_recs[i].c_blkno);
2647 }
2648 }
2649
2650 /*
2651 * For a given allocation, determine which allocators will need to be
2652 * accessed, and lock them, reserving the appropriate number of bits.
2653 *
2654 * Sparse file systems call this from ocfs2_write_begin_nolock()
2655 * and ocfs2_allocate_unwritten_extents().
2656 *
2657 * File systems which don't support holes call this from
2658 * ocfs2_extend_allocation().
2659 */
2660 int ocfs2_lock_allocators(struct inode *inode,
2661 struct ocfs2_extent_tree *et,
2662 u32 clusters_to_add, u32 extents_to_split,
2663 struct ocfs2_alloc_context **data_ac,
2664 struct ocfs2_alloc_context **meta_ac)
2665 {
2666 int ret = 0, num_free_extents;
2667 unsigned int max_recs_needed = clusters_to_add + 2 * extents_to_split;
2668 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2669
2670 *meta_ac = NULL;
2671 if (data_ac)
2672 *data_ac = NULL;
2673
2674 BUG_ON(clusters_to_add != 0 && data_ac == NULL);
2675
2676 num_free_extents = ocfs2_num_free_extents(osb, et);
2677 if (num_free_extents < 0) {
2678 ret = num_free_extents;
2679 mlog_errno(ret);
2680 goto out;
2681 }
2682
2683 /*
2684 * Sparse allocation file systems need to be more conservative
2685 * with reserving room for expansion - the actual allocation
2686 * happens while we've got a journal handle open so re-taking
2687 * a cluster lock (because we ran out of room for another
2688 * extent) will violate ordering rules.
2689 *
2690 * Most of the time we'll only be seeing this 1 cluster at a time
2691 * anyway.
2692 *
2693 * Always lock for any unwritten extents - we might want to
2694 * add blocks during a split.
2695 */
2696 if (!num_free_extents ||
2697 (ocfs2_sparse_alloc(osb) && num_free_extents < max_recs_needed)) {
2698 ret = ocfs2_reserve_new_metadata(osb, et->et_root_el, meta_ac);
2699 if (ret < 0) {
2700 if (ret != -ENOSPC)
2701 mlog_errno(ret);
2702 goto out;
2703 }
2704 }
2705
2706 if (clusters_to_add == 0)
2707 goto out;
2708
2709 ret = ocfs2_reserve_clusters(osb, clusters_to_add, data_ac);
2710 if (ret < 0) {
2711 if (ret != -ENOSPC)
2712 mlog_errno(ret);
2713 goto out;
2714 }
2715
2716 out:
2717 if (ret) {
2718 if (*meta_ac) {
2719 ocfs2_free_alloc_context(*meta_ac);
2720 *meta_ac = NULL;
2721 }
2722
2723 /*
2724 * We cannot have an error and a non null *data_ac.
2725 */
2726 }
2727
2728 return ret;
2729 }
2730
2731 /*
2732 * Read the inode specified by blkno to get suballoc_slot and
2733 * suballoc_bit.
2734 */
2735 static int ocfs2_get_suballoc_slot_bit(struct ocfs2_super *osb, u64 blkno,
2736 u16 *suballoc_slot, u64 *group_blkno,
2737 u16 *suballoc_bit)
2738 {
2739 int status;
2740 struct buffer_head *inode_bh = NULL;
2741 struct ocfs2_dinode *inode_fe;
2742
2743 mlog_entry("blkno: %llu\n", (unsigned long long)blkno);
2744
2745 /* dirty read disk */
2746 status = ocfs2_read_blocks_sync(osb, blkno, 1, &inode_bh);
2747 if (status < 0) {
2748 mlog(ML_ERROR, "read block %llu failed %d\n",
2749 (unsigned long long)blkno, status);
2750 goto bail;
2751 }
2752
2753 inode_fe = (struct ocfs2_dinode *) inode_bh->b_data;
2754 if (!OCFS2_IS_VALID_DINODE(inode_fe)) {
2755 mlog(ML_ERROR, "invalid inode %llu requested\n",
2756 (unsigned long long)blkno);
2757 status = -EINVAL;
2758 goto bail;
2759 }
2760
2761 if (le16_to_cpu(inode_fe->i_suballoc_slot) != (u16)OCFS2_INVALID_SLOT &&
2762 (u32)le16_to_cpu(inode_fe->i_suballoc_slot) > osb->max_slots - 1) {
2763 mlog(ML_ERROR, "inode %llu has invalid suballoc slot %u\n",
2764 (unsigned long long)blkno,
2765 (u32)le16_to_cpu(inode_fe->i_suballoc_slot));
2766 status = -EINVAL;
2767 goto bail;
2768 }
2769
2770 if (suballoc_slot)
2771 *suballoc_slot = le16_to_cpu(inode_fe->i_suballoc_slot);
2772 if (suballoc_bit)
2773 *suballoc_bit = le16_to_cpu(inode_fe->i_suballoc_bit);
2774 if (group_blkno)
2775 *group_blkno = le64_to_cpu(inode_fe->i_suballoc_loc);
2776
2777 bail:
2778 brelse(inode_bh);
2779
2780 mlog_exit(status);
2781 return status;
2782 }
2783
2784 /*
2785 * test whether bit is SET in allocator bitmap or not. on success, 0
2786 * is returned and *res is 1 for SET; 0 otherwise. when fails, errno
2787 * is returned and *res is meaningless. Call this after you have
2788 * cluster locked against suballoc, or you may get a result based on
2789 * non-up2date contents
2790 */
2791 static int ocfs2_test_suballoc_bit(struct ocfs2_super *osb,
2792 struct inode *suballoc,
2793 struct buffer_head *alloc_bh,
2794 u64 group_blkno, u64 blkno,
2795 u16 bit, int *res)
2796 {
2797 struct ocfs2_dinode *alloc_di;
2798 struct ocfs2_group_desc *group;
2799 struct buffer_head *group_bh = NULL;
2800 u64 bg_blkno;
2801 int status;
2802
2803 mlog_entry("blkno: %llu bit: %u\n", (unsigned long long)blkno,
2804 (unsigned int)bit);
2805
2806 alloc_di = (struct ocfs2_dinode *)alloc_bh->b_data;
2807 if ((bit + 1) > ocfs2_bits_per_group(&alloc_di->id2.i_chain)) {
2808 mlog(ML_ERROR, "suballoc bit %u out of range of %u\n",
2809 (unsigned int)bit,
2810 ocfs2_bits_per_group(&alloc_di->id2.i_chain));
2811 status = -EINVAL;
2812 goto bail;
2813 }
2814
2815 bg_blkno = group_blkno ? group_blkno :
2816 ocfs2_which_suballoc_group(blkno, bit);
2817 status = ocfs2_read_group_descriptor(suballoc, alloc_di, bg_blkno,
2818 &group_bh);
2819 if (status < 0) {
2820 mlog(ML_ERROR, "read group %llu failed %d\n",
2821 (unsigned long long)bg_blkno, status);
2822 goto bail;
2823 }
2824
2825 group = (struct ocfs2_group_desc *) group_bh->b_data;
2826 *res = ocfs2_test_bit(bit, (unsigned long *)group->bg_bitmap);
2827
2828 bail:
2829 brelse(group_bh);
2830
2831 mlog_exit(status);
2832 return status;
2833 }
2834
2835 /*
2836 * Test if the bit representing this inode (blkno) is set in the
2837 * suballocator.
2838 *
2839 * On success, 0 is returned and *res is 1 for SET; 0 otherwise.
2840 *
2841 * In the event of failure, a negative value is returned and *res is
2842 * meaningless.
2843 *
2844 * Callers must make sure to hold nfs_sync_lock to prevent
2845 * ocfs2_delete_inode() on another node from accessing the same
2846 * suballocator concurrently.
2847 */
2848 int ocfs2_test_inode_bit(struct ocfs2_super *osb, u64 blkno, int *res)
2849 {
2850 int status;
2851 u64 group_blkno = 0;
2852 u16 suballoc_bit = 0, suballoc_slot = 0;
2853 struct inode *inode_alloc_inode;
2854 struct buffer_head *alloc_bh = NULL;
2855
2856 mlog_entry("blkno: %llu", (unsigned long long)blkno);
2857
2858 status = ocfs2_get_suballoc_slot_bit(osb, blkno, &suballoc_slot,
2859 &group_blkno, &suballoc_bit);
2860 if (status < 0) {
2861 mlog(ML_ERROR, "get alloc slot and bit failed %d\n", status);
2862 goto bail;
2863 }
2864
2865 inode_alloc_inode =
2866 ocfs2_get_system_file_inode(osb, INODE_ALLOC_SYSTEM_INODE,
2867 suballoc_slot);
2868 if (!inode_alloc_inode) {
2869 /* the error code could be inaccurate, but we are not able to
2870 * get the correct one. */
2871 status = -EINVAL;
2872 mlog(ML_ERROR, "unable to get alloc inode in slot %u\n",
2873 (u32)suballoc_slot);
2874 goto bail;
2875 }
2876
2877 mutex_lock(&inode_alloc_inode->i_mutex);
2878 status = ocfs2_inode_lock(inode_alloc_inode, &alloc_bh, 0);
2879 if (status < 0) {
2880 mutex_unlock(&inode_alloc_inode->i_mutex);
2881 mlog(ML_ERROR, "lock on alloc inode on slot %u failed %d\n",
2882 (u32)suballoc_slot, status);
2883 goto bail;
2884 }
2885
2886 status = ocfs2_test_suballoc_bit(osb, inode_alloc_inode, alloc_bh,
2887 group_blkno, blkno, suballoc_bit, res);
2888 if (status < 0)
2889 mlog(ML_ERROR, "test suballoc bit failed %d\n", status);
2890
2891 ocfs2_inode_unlock(inode_alloc_inode, 0);
2892 mutex_unlock(&inode_alloc_inode->i_mutex);
2893
2894 iput(inode_alloc_inode);
2895 brelse(alloc_bh);
2896 bail:
2897 mlog_exit(status);
2898 return status;
2899 }
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