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ocfs2: fix locking for res->tracking and dlm->tracking_list
[linux/fpc-iii.git] / fs / ocfs2 / suballoc.c
blobfc6d25f6d4442c79dd376da24f18c3e3355232ed
1 /* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * suballoc.c
5 *
6 * metadata alloc and free
7 * Inspired by ext3 block groups.
8 *
9 * Copyright (C) 2002, 2004 Oracle. All rights reserved.
10 *
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public
13 * License as published by the Free Software Foundation; either
14 * version 2 of the License, or (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public
22 * License along with this program; if not, write to the
23 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
24 * Boston, MA 021110-1307, USA.
25 */
26
27 #include <linux/fs.h>
28 #include <linux/types.h>
29 #include <linux/slab.h>
30 #include <linux/highmem.h>
31
32 #include <cluster/masklog.h>
33
34 #include "ocfs2.h"
35
36 #include "alloc.h"
37 #include "blockcheck.h"
38 #include "dlmglue.h"
39 #include "inode.h"
40 #include "journal.h"
41 #include "localalloc.h"
42 #include "suballoc.h"
43 #include "super.h"
44 #include "sysfile.h"
45 #include "uptodate.h"
46 #include "ocfs2_trace.h"
47
48 #include "buffer_head_io.h"
49
50 #define NOT_ALLOC_NEW_GROUP 0
51 #define ALLOC_NEW_GROUP 0x1
52 #define ALLOC_GROUPS_FROM_GLOBAL 0x2
53
54 #define OCFS2_MAX_TO_STEAL 1024
55
56 struct ocfs2_suballoc_result {
57 u64 sr_bg_blkno; /* The bg we allocated from. Set
58 to 0 when a block group is
59 contiguous. */
60 u64 sr_bg_stable_blkno; /*
61 * Doesn't change, always
62 * set to target block
63 * group descriptor
64 * block.
65 */
66 u64 sr_blkno; /* The first allocated block */
67 unsigned int sr_bit_offset; /* The bit in the bg */
68 unsigned int sr_bits; /* How many bits we claimed */
69 };
70
71 static u64 ocfs2_group_from_res(struct ocfs2_suballoc_result *res)
72 {
73 if (res->sr_blkno == 0)
74 return 0;
75
76 if (res->sr_bg_blkno)
77 return res->sr_bg_blkno;
78
79 return ocfs2_which_suballoc_group(res->sr_blkno, res->sr_bit_offset);
80 }
81
82 static inline void ocfs2_debug_bg(struct ocfs2_group_desc *bg);
83 static inline void ocfs2_debug_suballoc_inode(struct ocfs2_dinode *fe);
84 static inline u16 ocfs2_find_victim_chain(struct ocfs2_chain_list *cl);
85 static int ocfs2_block_group_fill(handle_t *handle,
86 struct inode *alloc_inode,
87 struct buffer_head *bg_bh,
88 u64 group_blkno,
89 unsigned int group_clusters,
90 u16 my_chain,
91 struct ocfs2_chain_list *cl);
92 static int ocfs2_block_group_alloc(struct ocfs2_super *osb,
93 struct inode *alloc_inode,
94 struct buffer_head *bh,
95 u64 max_block,
96 u64 *last_alloc_group,
97 int flags);
98
99 static int ocfs2_cluster_group_search(struct inode *inode,
100 struct buffer_head *group_bh,
101 u32 bits_wanted, u32 min_bits,
102 u64 max_block,
103 struct ocfs2_suballoc_result *res);
104 static int ocfs2_block_group_search(struct inode *inode,
105 struct buffer_head *group_bh,
106 u32 bits_wanted, u32 min_bits,
107 u64 max_block,
108 struct ocfs2_suballoc_result *res);
109 static int ocfs2_claim_suballoc_bits(struct ocfs2_alloc_context *ac,
110 handle_t *handle,
111 u32 bits_wanted,
112 u32 min_bits,
113 struct ocfs2_suballoc_result *res);
114 static int ocfs2_test_bg_bit_allocatable(struct buffer_head *bg_bh,
115 int nr);
116 static int ocfs2_relink_block_group(handle_t *handle,
117 struct inode *alloc_inode,
118 struct buffer_head *fe_bh,
119 struct buffer_head *bg_bh,
120 struct buffer_head *prev_bg_bh,
121 u16 chain);
122 static inline int ocfs2_block_group_reasonably_empty(struct ocfs2_group_desc *bg,
123 u32 wanted);
124 static inline u32 ocfs2_desc_bitmap_to_cluster_off(struct inode *inode,
125 u64 bg_blkno,
126 u16 bg_bit_off);
127 static inline void ocfs2_block_to_cluster_group(struct inode *inode,
128 u64 data_blkno,
129 u64 *bg_blkno,
130 u16 *bg_bit_off);
131 static int ocfs2_reserve_clusters_with_limit(struct ocfs2_super *osb,
132 u32 bits_wanted, u64 max_block,
133 int flags,
134 struct ocfs2_alloc_context **ac);
135
136 void ocfs2_free_ac_resource(struct ocfs2_alloc_context *ac)
137 {
138 struct inode *inode = ac->ac_inode;
139
140 if (inode) {
141 if (ac->ac_which != OCFS2_AC_USE_LOCAL)
142 ocfs2_inode_unlock(inode, 1);
143
144 mutex_unlock(&inode->i_mutex);
145
146 iput(inode);
147 ac->ac_inode = NULL;
148 }
149 brelse(ac->ac_bh);
150 ac->ac_bh = NULL;
151 ac->ac_resv = NULL;
152 kfree(ac->ac_find_loc_priv);
153 ac->ac_find_loc_priv = NULL;
154 }
155
156 void ocfs2_free_alloc_context(struct ocfs2_alloc_context *ac)
157 {
158 ocfs2_free_ac_resource(ac);
159 kfree(ac);
160 }
161
162 static u32 ocfs2_bits_per_group(struct ocfs2_chain_list *cl)
163 {
164 return (u32)le16_to_cpu(cl->cl_cpg) * (u32)le16_to_cpu(cl->cl_bpc);
165 }
166
167 #define do_error(fmt, ...) \
168 do { \
169 if (resize) \
170 mlog(ML_ERROR, fmt, ##__VA_ARGS__); \
171 else \
172 return ocfs2_error(sb, fmt, ##__VA_ARGS__); \
173 } while (0)
174
175 static int ocfs2_validate_gd_self(struct super_block *sb,
176 struct buffer_head *bh,
177 int resize)
178 {
179 struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data;
180
181 if (!OCFS2_IS_VALID_GROUP_DESC(gd)) {
182 do_error("Group descriptor #%llu has bad signature %.*s\n",
183 (unsigned long long)bh->b_blocknr, 7,
184 gd->bg_signature);
185 }
186
187 if (le64_to_cpu(gd->bg_blkno) != bh->b_blocknr) {
188 do_error("Group descriptor #%llu has an invalid bg_blkno of %llu\n",
189 (unsigned long long)bh->b_blocknr,
190 (unsigned long long)le64_to_cpu(gd->bg_blkno));
191 }
192
193 if (le32_to_cpu(gd->bg_generation) != OCFS2_SB(sb)->fs_generation) {
194 do_error("Group descriptor #%llu has an invalid fs_generation of #%u\n",
195 (unsigned long long)bh->b_blocknr,
196 le32_to_cpu(gd->bg_generation));
197 }
198
199 if (le16_to_cpu(gd->bg_free_bits_count) > le16_to_cpu(gd->bg_bits)) {
200 do_error("Group descriptor #%llu has bit count %u but claims that %u are free\n",
201 (unsigned long long)bh->b_blocknr,
202 le16_to_cpu(gd->bg_bits),
203 le16_to_cpu(gd->bg_free_bits_count));
204 }
205
206 if (le16_to_cpu(gd->bg_bits) > (8 * le16_to_cpu(gd->bg_size))) {
207 do_error("Group descriptor #%llu has bit count %u but max bitmap bits of %u\n",
208 (unsigned long long)bh->b_blocknr,
209 le16_to_cpu(gd->bg_bits),
210 8 * le16_to_cpu(gd->bg_size));
211 }
212
213 return 0;
214 }
215
216 static int ocfs2_validate_gd_parent(struct super_block *sb,
217 struct ocfs2_dinode *di,
218 struct buffer_head *bh,
219 int resize)
220 {
221 unsigned int max_bits;
222 struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data;
223
224 if (di->i_blkno != gd->bg_parent_dinode) {
225 do_error("Group descriptor #%llu has bad parent pointer (%llu, expected %llu)\n",
226 (unsigned long long)bh->b_blocknr,
227 (unsigned long long)le64_to_cpu(gd->bg_parent_dinode),
228 (unsigned long long)le64_to_cpu(di->i_blkno));
229 }
230
231 max_bits = le16_to_cpu(di->id2.i_chain.cl_cpg) * le16_to_cpu(di->id2.i_chain.cl_bpc);
232 if (le16_to_cpu(gd->bg_bits) > max_bits) {
233 do_error("Group descriptor #%llu has bit count of %u\n",
234 (unsigned long long)bh->b_blocknr,
235 le16_to_cpu(gd->bg_bits));
236 }
237
238 /* In resize, we may meet the case bg_chain == cl_next_free_rec. */
239 if ((le16_to_cpu(gd->bg_chain) >
240 le16_to_cpu(di->id2.i_chain.cl_next_free_rec)) ||
241 ((le16_to_cpu(gd->bg_chain) ==
242 le16_to_cpu(di->id2.i_chain.cl_next_free_rec)) && !resize)) {
243 do_error("Group descriptor #%llu has bad chain %u\n",
244 (unsigned long long)bh->b_blocknr,
245 le16_to_cpu(gd->bg_chain));
246 }
247
248 return 0;
249 }
250
251 #undef do_error
252
253 /*
254 * This version only prints errors. It does not fail the filesystem, and
255 * exists only for resize.
256 */
257 int ocfs2_check_group_descriptor(struct super_block *sb,
258 struct ocfs2_dinode *di,
259 struct buffer_head *bh)
260 {
261 int rc;
262 struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data;
263
264 BUG_ON(!buffer_uptodate(bh));
265
266 /*
267 * If the ecc fails, we return the error but otherwise
268 * leave the filesystem running. We know any error is
269 * local to this block.
270 */
271 rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &gd->bg_check);
272 if (rc) {
273 mlog(ML_ERROR,
274 "Checksum failed for group descriptor %llu\n",
275 (unsigned long long)bh->b_blocknr);
276 } else
277 rc = ocfs2_validate_gd_self(sb, bh, 1);
278 if (!rc)
279 rc = ocfs2_validate_gd_parent(sb, di, bh, 1);
280
281 return rc;
282 }
283
284 static int ocfs2_validate_group_descriptor(struct super_block *sb,
285 struct buffer_head *bh)
286 {
287 int rc;
288 struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data;
289
290 trace_ocfs2_validate_group_descriptor(
291 (unsigned long long)bh->b_blocknr);
292
293 BUG_ON(!buffer_uptodate(bh));
294
295 /*
296 * If the ecc fails, we return the error but otherwise
297 * leave the filesystem running. We know any error is
298 * local to this block.
299 */
300 rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &gd->bg_check);
301 if (rc)
302 return rc;
303
304 /*
305 * Errors after here are fatal.
306 */
307
308 return ocfs2_validate_gd_self(sb, bh, 0);
309 }
310
311 int ocfs2_read_group_descriptor(struct inode *inode, struct ocfs2_dinode *di,
312 u64 gd_blkno, struct buffer_head **bh)
313 {
314 int rc;
315 struct buffer_head *tmp = *bh;
316
317 rc = ocfs2_read_block(INODE_CACHE(inode), gd_blkno, &tmp,
318 ocfs2_validate_group_descriptor);
319 if (rc)
320 goto out;
321
322 rc = ocfs2_validate_gd_parent(inode->i_sb, di, tmp, 0);
323 if (rc) {
324 brelse(tmp);
325 goto out;
326 }
327
328 /* If ocfs2_read_block() got us a new bh, pass it up. */
329 if (!*bh)
330 *bh = tmp;
331
332 out:
333 return rc;
334 }
335
336 static void ocfs2_bg_discontig_add_extent(struct ocfs2_super *osb,
337 struct ocfs2_group_desc *bg,
338 struct ocfs2_chain_list *cl,
339 u64 p_blkno, unsigned int clusters)
340 {
341 struct ocfs2_extent_list *el = &bg->bg_list;
342 struct ocfs2_extent_rec *rec;
343
344 BUG_ON(!ocfs2_supports_discontig_bg(osb));
345 if (!el->l_next_free_rec)
346 el->l_count = cpu_to_le16(ocfs2_extent_recs_per_gd(osb->sb));
347 rec = &el->l_recs[le16_to_cpu(el->l_next_free_rec)];
348 rec->e_blkno = cpu_to_le64(p_blkno);
349 rec->e_cpos = cpu_to_le32(le16_to_cpu(bg->bg_bits) /
350 le16_to_cpu(cl->cl_bpc));
351 rec->e_leaf_clusters = cpu_to_le16(clusters);
352 le16_add_cpu(&bg->bg_bits, clusters * le16_to_cpu(cl->cl_bpc));
353 le16_add_cpu(&bg->bg_free_bits_count,
354 clusters * le16_to_cpu(cl->cl_bpc));
355 le16_add_cpu(&el->l_next_free_rec, 1);
356 }
357
358 static int ocfs2_block_group_fill(handle_t *handle,
359 struct inode *alloc_inode,
360 struct buffer_head *bg_bh,
361 u64 group_blkno,
362 unsigned int group_clusters,
363 u16 my_chain,
364 struct ocfs2_chain_list *cl)
365 {
366 int status = 0;
367 struct ocfs2_super *osb = OCFS2_SB(alloc_inode->i_sb);
368 struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data;
369 struct super_block * sb = alloc_inode->i_sb;
370
371 if (((unsigned long long) bg_bh->b_blocknr) != group_blkno) {
372 status = ocfs2_error(alloc_inode->i_sb,
373 "group block (%llu) != b_blocknr (%llu)\n",
374 (unsigned long long)group_blkno,
375 (unsigned long long) bg_bh->b_blocknr);
376 goto bail;
377 }
378
379 status = ocfs2_journal_access_gd(handle,
380 INODE_CACHE(alloc_inode),
381 bg_bh,
382 OCFS2_JOURNAL_ACCESS_CREATE);
383 if (status < 0) {
384 mlog_errno(status);
385 goto bail;
386 }
387
388 memset(bg, 0, sb->s_blocksize);
389 strcpy(bg->bg_signature, OCFS2_GROUP_DESC_SIGNATURE);
390 bg->bg_generation = cpu_to_le32(OCFS2_SB(sb)->fs_generation);
391 bg->bg_size = cpu_to_le16(ocfs2_group_bitmap_size(sb, 1,
392 osb->s_feature_incompat));
393 bg->bg_chain = cpu_to_le16(my_chain);
394 bg->bg_next_group = cl->cl_recs[my_chain].c_blkno;
395 bg->bg_parent_dinode = cpu_to_le64(OCFS2_I(alloc_inode)->ip_blkno);
396 bg->bg_blkno = cpu_to_le64(group_blkno);
397 if (group_clusters == le16_to_cpu(cl->cl_cpg))
398 bg->bg_bits = cpu_to_le16(ocfs2_bits_per_group(cl));
399 else
400 ocfs2_bg_discontig_add_extent(osb, bg, cl, group_blkno,
401 group_clusters);
402
403 /* set the 1st bit in the bitmap to account for the descriptor block */
404 ocfs2_set_bit(0, (unsigned long *)bg->bg_bitmap);
405 bg->bg_free_bits_count = cpu_to_le16(le16_to_cpu(bg->bg_bits) - 1);
406
407 ocfs2_journal_dirty(handle, bg_bh);
408
409 /* There is no need to zero out or otherwise initialize the
410 * other blocks in a group - All valid FS metadata in a block
411 * group stores the superblock fs_generation value at
412 * allocation time. */
413
414 bail:
415 if (status)
416 mlog_errno(status);
417 return status;
418 }
419
420 static inline u16 ocfs2_find_smallest_chain(struct ocfs2_chain_list *cl)
421 {
422 u16 curr, best;
423
424 best = curr = 0;
425 while (curr < le16_to_cpu(cl->cl_count)) {
426 if (le32_to_cpu(cl->cl_recs[best].c_total) >
427 le32_to_cpu(cl->cl_recs[curr].c_total))
428 best = curr;
429 curr++;
430 }
431 return best;
432 }
433
434 static struct buffer_head *
435 ocfs2_block_group_alloc_contig(struct ocfs2_super *osb, handle_t *handle,
436 struct inode *alloc_inode,
437 struct ocfs2_alloc_context *ac,
438 struct ocfs2_chain_list *cl)
439 {
440 int status;
441 u32 bit_off, num_bits;
442 u64 bg_blkno;
443 struct buffer_head *bg_bh;
444 unsigned int alloc_rec = ocfs2_find_smallest_chain(cl);
445
446 status = ocfs2_claim_clusters(handle, ac,
447 le16_to_cpu(cl->cl_cpg), &bit_off,
448 &num_bits);
449 if (status < 0) {
450 if (status != -ENOSPC)
451 mlog_errno(status);
452 goto bail;
453 }
454
455 /* setup the group */
456 bg_blkno = ocfs2_clusters_to_blocks(osb->sb, bit_off);
457 trace_ocfs2_block_group_alloc_contig(
458 (unsigned long long)bg_blkno, alloc_rec);
459
460 bg_bh = sb_getblk(osb->sb, bg_blkno);
461 if (!bg_bh) {
462 status = -ENOMEM;
463 mlog_errno(status);
464 goto bail;
465 }
466 ocfs2_set_new_buffer_uptodate(INODE_CACHE(alloc_inode), bg_bh);
467
468 status = ocfs2_block_group_fill(handle, alloc_inode, bg_bh,
469 bg_blkno, num_bits, alloc_rec, cl);
470 if (status < 0) {
471 brelse(bg_bh);
472 mlog_errno(status);
473 }
474
475 bail:
476 return status ? ERR_PTR(status) : bg_bh;
477 }
478
479 static int ocfs2_block_group_claim_bits(struct ocfs2_super *osb,
480 handle_t *handle,
481 struct ocfs2_alloc_context *ac,
482 unsigned int min_bits,
483 u32 *bit_off, u32 *num_bits)
484 {
485 int status = 0;
486
487 while (min_bits) {
488 status = ocfs2_claim_clusters(handle, ac, min_bits,
489 bit_off, num_bits);
490 if (status != -ENOSPC)
491 break;
492
493 min_bits >>= 1;
494 }
495
496 return status;
497 }
498
499 static int ocfs2_block_group_grow_discontig(handle_t *handle,
500 struct inode *alloc_inode,
501 struct buffer_head *bg_bh,
502 struct ocfs2_alloc_context *ac,
503 struct ocfs2_chain_list *cl,
504 unsigned int min_bits)
505 {
506 int status;
507 struct ocfs2_super *osb = OCFS2_SB(alloc_inode->i_sb);
508 struct ocfs2_group_desc *bg =
509 (struct ocfs2_group_desc *)bg_bh->b_data;
510 unsigned int needed = le16_to_cpu(cl->cl_cpg) -
511 le16_to_cpu(bg->bg_bits) / le16_to_cpu(cl->cl_bpc);
512 u32 p_cpos, clusters;
513 u64 p_blkno;
514 struct ocfs2_extent_list *el = &bg->bg_list;
515
516 status = ocfs2_journal_access_gd(handle,
517 INODE_CACHE(alloc_inode),
518 bg_bh,
519 OCFS2_JOURNAL_ACCESS_CREATE);
520 if (status < 0) {
521 mlog_errno(status);
522 goto bail;
523 }
524
525 while ((needed > 0) && (le16_to_cpu(el->l_next_free_rec) <
526 le16_to_cpu(el->l_count))) {
527 if (min_bits > needed)
528 min_bits = needed;
529 status = ocfs2_block_group_claim_bits(osb, handle, ac,
530 min_bits, &p_cpos,
531 &clusters);
532 if (status < 0) {
533 if (status != -ENOSPC)
534 mlog_errno(status);
535 goto bail;
536 }
537 p_blkno = ocfs2_clusters_to_blocks(osb->sb, p_cpos);
538 ocfs2_bg_discontig_add_extent(osb, bg, cl, p_blkno,
539 clusters);
540
541 min_bits = clusters;
542 needed = le16_to_cpu(cl->cl_cpg) -
543 le16_to_cpu(bg->bg_bits) / le16_to_cpu(cl->cl_bpc);
544 }
545
546 if (needed > 0) {
547 /*
548 * We have used up all the extent rec but can't fill up
549 * the cpg. So bail out.
550 */
551 status = -ENOSPC;
552 goto bail;
553 }
554
555 ocfs2_journal_dirty(handle, bg_bh);
556
557 bail:
558 return status;
559 }
560
561 static void ocfs2_bg_alloc_cleanup(handle_t *handle,
562 struct ocfs2_alloc_context *cluster_ac,
563 struct inode *alloc_inode,
564 struct buffer_head *bg_bh)
565 {
566 int i, ret;
567 struct ocfs2_group_desc *bg;
568 struct ocfs2_extent_list *el;
569 struct ocfs2_extent_rec *rec;
570
571 if (!bg_bh)
572 return;
573
574 bg = (struct ocfs2_group_desc *)bg_bh->b_data;
575 el = &bg->bg_list;
576 for (i = 0; i < le16_to_cpu(el->l_next_free_rec); i++) {
577 rec = &el->l_recs[i];
578 ret = ocfs2_free_clusters(handle, cluster_ac->ac_inode,
579 cluster_ac->ac_bh,
580 le64_to_cpu(rec->e_blkno),
581 le16_to_cpu(rec->e_leaf_clusters));
582 if (ret)
583 mlog_errno(ret);
584 /* Try all the clusters to free */
585 }
586
587 ocfs2_remove_from_cache(INODE_CACHE(alloc_inode), bg_bh);
588 brelse(bg_bh);
589 }
590
591 static struct buffer_head *
592 ocfs2_block_group_alloc_discontig(handle_t *handle,
593 struct inode *alloc_inode,
594 struct ocfs2_alloc_context *ac,
595 struct ocfs2_chain_list *cl)
596 {
597 int status;
598 u32 bit_off, num_bits;
599 u64 bg_blkno;
600 unsigned int min_bits = le16_to_cpu(cl->cl_cpg) >> 1;
601 struct buffer_head *bg_bh = NULL;
602 unsigned int alloc_rec = ocfs2_find_smallest_chain(cl);
603 struct ocfs2_super *osb = OCFS2_SB(alloc_inode->i_sb);
604
605 if (!ocfs2_supports_discontig_bg(osb)) {
606 status = -ENOSPC;
607 goto bail;
608 }
609
610 status = ocfs2_extend_trans(handle,
611 ocfs2_calc_bg_discontig_credits(osb->sb));
612 if (status) {
613 mlog_errno(status);
614 goto bail;
615 }
616
617 /*
618 * We're going to be grabbing from multiple cluster groups.
619 * We don't have enough credits to relink them all, and the
620 * cluster groups will be staying in cache for the duration of
621 * this operation.
622 */
623 ac->ac_disable_chain_relink = 1;
624
625 /* Claim the first region */
626 status = ocfs2_block_group_claim_bits(osb, handle, ac, min_bits,
627 &bit_off, &num_bits);
628 if (status < 0) {
629 if (status != -ENOSPC)
630 mlog_errno(status);
631 goto bail;
632 }
633 min_bits = num_bits;
634
635 /* setup the group */
636 bg_blkno = ocfs2_clusters_to_blocks(osb->sb, bit_off);
637 trace_ocfs2_block_group_alloc_discontig(
638 (unsigned long long)bg_blkno, alloc_rec);
639
640 bg_bh = sb_getblk(osb->sb, bg_blkno);
641 if (!bg_bh) {
642 status = -ENOMEM;
643 mlog_errno(status);
644 goto bail;
645 }
646 ocfs2_set_new_buffer_uptodate(INODE_CACHE(alloc_inode), bg_bh);
647
648 status = ocfs2_block_group_fill(handle, alloc_inode, bg_bh,
649 bg_blkno, num_bits, alloc_rec, cl);
650 if (status < 0) {
651 mlog_errno(status);
652 goto bail;
653 }
654
655 status = ocfs2_block_group_grow_discontig(handle, alloc_inode,
656 bg_bh, ac, cl, min_bits);
657 if (status)
658 mlog_errno(status);
659
660 bail:
661 if (status)
662 ocfs2_bg_alloc_cleanup(handle, ac, alloc_inode, bg_bh);
663 return status ? ERR_PTR(status) : bg_bh;
664 }
665
666 /*
667 * We expect the block group allocator to already be locked.
668 */
669 static int ocfs2_block_group_alloc(struct ocfs2_super *osb,
670 struct inode *alloc_inode,
671 struct buffer_head *bh,
672 u64 max_block,
673 u64 *last_alloc_group,
674 int flags)
675 {
676 int status, credits;
677 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) bh->b_data;
678 struct ocfs2_chain_list *cl;
679 struct ocfs2_alloc_context *ac = NULL;
680 handle_t *handle = NULL;
681 u16 alloc_rec;
682 struct buffer_head *bg_bh = NULL;
683 struct ocfs2_group_desc *bg;
684
685 BUG_ON(ocfs2_is_cluster_bitmap(alloc_inode));
686
687 cl = &fe->id2.i_chain;
688 status = ocfs2_reserve_clusters_with_limit(osb,
689 le16_to_cpu(cl->cl_cpg),
690 max_block, flags, &ac);
691 if (status < 0) {
692 if (status != -ENOSPC)
693 mlog_errno(status);
694 goto bail;
695 }
696
697 credits = ocfs2_calc_group_alloc_credits(osb->sb,
698 le16_to_cpu(cl->cl_cpg));
699 handle = ocfs2_start_trans(osb, credits);
700 if (IS_ERR(handle)) {
701 status = PTR_ERR(handle);
702 handle = NULL;
703 mlog_errno(status);
704 goto bail;
705 }
706
707 if (last_alloc_group && *last_alloc_group != 0) {
708 trace_ocfs2_block_group_alloc(
709 (unsigned long long)*last_alloc_group);
710 ac->ac_last_group = *last_alloc_group;
711 }
712
713 bg_bh = ocfs2_block_group_alloc_contig(osb, handle, alloc_inode,
714 ac, cl);
715 if (IS_ERR(bg_bh) && (PTR_ERR(bg_bh) == -ENOSPC))
716 bg_bh = ocfs2_block_group_alloc_discontig(handle,
717 alloc_inode,
718 ac, cl);
719 if (IS_ERR(bg_bh)) {
720 status = PTR_ERR(bg_bh);
721 bg_bh = NULL;
722 if (status != -ENOSPC)
723 mlog_errno(status);
724 goto bail;
725 }
726 bg = (struct ocfs2_group_desc *) bg_bh->b_data;
727
728 status = ocfs2_journal_access_di(handle, INODE_CACHE(alloc_inode),
729 bh, OCFS2_JOURNAL_ACCESS_WRITE);
730 if (status < 0) {
731 mlog_errno(status);
732 goto bail;
733 }
734
735 alloc_rec = le16_to_cpu(bg->bg_chain);
736 le32_add_cpu(&cl->cl_recs[alloc_rec].c_free,
737 le16_to_cpu(bg->bg_free_bits_count));
738 le32_add_cpu(&cl->cl_recs[alloc_rec].c_total,
739 le16_to_cpu(bg->bg_bits));
740 cl->cl_recs[alloc_rec].c_blkno = bg->bg_blkno;
741 if (le16_to_cpu(cl->cl_next_free_rec) < le16_to_cpu(cl->cl_count))
742 le16_add_cpu(&cl->cl_next_free_rec, 1);
743
744 le32_add_cpu(&fe->id1.bitmap1.i_used, le16_to_cpu(bg->bg_bits) -
745 le16_to_cpu(bg->bg_free_bits_count));
746 le32_add_cpu(&fe->id1.bitmap1.i_total, le16_to_cpu(bg->bg_bits));
747 le32_add_cpu(&fe->i_clusters, le16_to_cpu(cl->cl_cpg));
748
749 ocfs2_journal_dirty(handle, bh);
750
751 spin_lock(&OCFS2_I(alloc_inode)->ip_lock);
752 OCFS2_I(alloc_inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
753 fe->i_size = cpu_to_le64(ocfs2_clusters_to_bytes(alloc_inode->i_sb,
754 le32_to_cpu(fe->i_clusters)));
755 spin_unlock(&OCFS2_I(alloc_inode)->ip_lock);
756 i_size_write(alloc_inode, le64_to_cpu(fe->i_size));
757 alloc_inode->i_blocks = ocfs2_inode_sector_count(alloc_inode);
758 ocfs2_update_inode_fsync_trans(handle, alloc_inode, 0);
759
760 status = 0;
761
762 /* save the new last alloc group so that the caller can cache it. */
763 if (last_alloc_group)
764 *last_alloc_group = ac->ac_last_group;
765
766 bail:
767 if (handle)
768 ocfs2_commit_trans(osb, handle);
769
770 if (ac)
771 ocfs2_free_alloc_context(ac);
772
773 brelse(bg_bh);
774
775 if (status)
776 mlog_errno(status);
777 return status;
778 }
779
780 static int ocfs2_reserve_suballoc_bits(struct ocfs2_super *osb,
781 struct ocfs2_alloc_context *ac,
782 int type,
783 u32 slot,
784 u64 *last_alloc_group,
785 int flags)
786 {
787 int status;
788 u32 bits_wanted = ac->ac_bits_wanted;
789 struct inode *alloc_inode;
790 struct buffer_head *bh = NULL;
791 struct ocfs2_dinode *fe;
792 u32 free_bits;
793
794 alloc_inode = ocfs2_get_system_file_inode(osb, type, slot);
795 if (!alloc_inode) {
796 mlog_errno(-EINVAL);
797 return -EINVAL;
798 }
799
800 mutex_lock(&alloc_inode->i_mutex);
801
802 status = ocfs2_inode_lock(alloc_inode, &bh, 1);
803 if (status < 0) {
804 mutex_unlock(&alloc_inode->i_mutex);
805 iput(alloc_inode);
806
807 mlog_errno(status);
808 return status;
809 }
810
811 ac->ac_inode = alloc_inode;
812 ac->ac_alloc_slot = slot;
813
814 fe = (struct ocfs2_dinode *) bh->b_data;
815
816 /* The bh was validated by the inode read inside
817 * ocfs2_inode_lock(). Any corruption is a code bug. */
818 BUG_ON(!OCFS2_IS_VALID_DINODE(fe));
819
820 if (!(fe->i_flags & cpu_to_le32(OCFS2_CHAIN_FL))) {
821 status = ocfs2_error(alloc_inode->i_sb,
822 "Invalid chain allocator %llu\n",
823 (unsigned long long)le64_to_cpu(fe->i_blkno));
824 goto bail;
825 }
826
827 free_bits = le32_to_cpu(fe->id1.bitmap1.i_total) -
828 le32_to_cpu(fe->id1.bitmap1.i_used);
829
830 if (bits_wanted > free_bits) {
831 /* cluster bitmap never grows */
832 if (ocfs2_is_cluster_bitmap(alloc_inode)) {
833 trace_ocfs2_reserve_suballoc_bits_nospc(bits_wanted,
834 free_bits);
835 status = -ENOSPC;
836 goto bail;
837 }
838
839 if (!(flags & ALLOC_NEW_GROUP)) {
840 trace_ocfs2_reserve_suballoc_bits_no_new_group(
841 slot, bits_wanted, free_bits);
842 status = -ENOSPC;
843 goto bail;
844 }
845
846 status = ocfs2_block_group_alloc(osb, alloc_inode, bh,
847 ac->ac_max_block,
848 last_alloc_group, flags);
849 if (status < 0) {
850 if (status != -ENOSPC)
851 mlog_errno(status);
852 goto bail;
853 }
854 atomic_inc(&osb->alloc_stats.bg_extends);
855
856 /* You should never ask for this much metadata */
857 BUG_ON(bits_wanted >
858 (le32_to_cpu(fe->id1.bitmap1.i_total)
859 - le32_to_cpu(fe->id1.bitmap1.i_used)));
860 }
861
862 get_bh(bh);
863 ac->ac_bh = bh;
864 bail:
865 brelse(bh);
866
867 if (status)
868 mlog_errno(status);
869 return status;
870 }
871
872 static void ocfs2_init_inode_steal_slot(struct ocfs2_super *osb)
873 {
874 spin_lock(&osb->osb_lock);
875 osb->s_inode_steal_slot = OCFS2_INVALID_SLOT;
876 spin_unlock(&osb->osb_lock);
877 atomic_set(&osb->s_num_inodes_stolen, 0);
878 }
879
880 static void ocfs2_init_meta_steal_slot(struct ocfs2_super *osb)
881 {
882 spin_lock(&osb->osb_lock);
883 osb->s_meta_steal_slot = OCFS2_INVALID_SLOT;
884 spin_unlock(&osb->osb_lock);
885 atomic_set(&osb->s_num_meta_stolen, 0);
886 }
887
888 void ocfs2_init_steal_slots(struct ocfs2_super *osb)
889 {
890 ocfs2_init_inode_steal_slot(osb);
891 ocfs2_init_meta_steal_slot(osb);
892 }
893
894 static void __ocfs2_set_steal_slot(struct ocfs2_super *osb, int slot, int type)
895 {
896 spin_lock(&osb->osb_lock);
897 if (type == INODE_ALLOC_SYSTEM_INODE)
898 osb->s_inode_steal_slot = slot;
899 else if (type == EXTENT_ALLOC_SYSTEM_INODE)
900 osb->s_meta_steal_slot = slot;
901 spin_unlock(&osb->osb_lock);
902 }
903
904 static int __ocfs2_get_steal_slot(struct ocfs2_super *osb, int type)
905 {
906 int slot = OCFS2_INVALID_SLOT;
907
908 spin_lock(&osb->osb_lock);
909 if (type == INODE_ALLOC_SYSTEM_INODE)
910 slot = osb->s_inode_steal_slot;
911 else if (type == EXTENT_ALLOC_SYSTEM_INODE)
912 slot = osb->s_meta_steal_slot;
913 spin_unlock(&osb->osb_lock);
914
915 return slot;
916 }
917
918 static int ocfs2_get_inode_steal_slot(struct ocfs2_super *osb)
919 {
920 return __ocfs2_get_steal_slot(osb, INODE_ALLOC_SYSTEM_INODE);
921 }
922
923 static int ocfs2_get_meta_steal_slot(struct ocfs2_super *osb)
924 {
925 return __ocfs2_get_steal_slot(osb, EXTENT_ALLOC_SYSTEM_INODE);
926 }
927
928 static int ocfs2_steal_resource(struct ocfs2_super *osb,
929 struct ocfs2_alloc_context *ac,
930 int type)
931 {
932 int i, status = -ENOSPC;
933 int slot = __ocfs2_get_steal_slot(osb, type);
934
935 /* Start to steal resource from the first slot after ours. */
936 if (slot == OCFS2_INVALID_SLOT)
937 slot = osb->slot_num + 1;
938
939 for (i = 0; i < osb->max_slots; i++, slot++) {
940 if (slot == osb->max_slots)
941 slot = 0;
942
943 if (slot == osb->slot_num)
944 continue;
945
946 status = ocfs2_reserve_suballoc_bits(osb, ac,
947 type,
948 (u32)slot, NULL,
949 NOT_ALLOC_NEW_GROUP);
950 if (status >= 0) {
951 __ocfs2_set_steal_slot(osb, slot, type);
952 break;
953 }
954
955 ocfs2_free_ac_resource(ac);
956 }
957
958 return status;
959 }
960
961 static int ocfs2_steal_inode(struct ocfs2_super *osb,
962 struct ocfs2_alloc_context *ac)
963 {
964 return ocfs2_steal_resource(osb, ac, INODE_ALLOC_SYSTEM_INODE);
965 }
966
967 static int ocfs2_steal_meta(struct ocfs2_super *osb,
968 struct ocfs2_alloc_context *ac)
969 {
970 return ocfs2_steal_resource(osb, ac, EXTENT_ALLOC_SYSTEM_INODE);
971 }
972
973 int ocfs2_reserve_new_metadata_blocks(struct ocfs2_super *osb,
974 int blocks,
975 struct ocfs2_alloc_context **ac)
976 {
977 int status;
978 int slot = ocfs2_get_meta_steal_slot(osb);
979
980 *ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
981 if (!(*ac)) {
982 status = -ENOMEM;
983 mlog_errno(status);
984 goto bail;
985 }
986
987 (*ac)->ac_bits_wanted = blocks;
988 (*ac)->ac_which = OCFS2_AC_USE_META;
989 (*ac)->ac_group_search = ocfs2_block_group_search;
990
991 if (slot != OCFS2_INVALID_SLOT &&
992 atomic_read(&osb->s_num_meta_stolen) < OCFS2_MAX_TO_STEAL)
993 goto extent_steal;
994
995 atomic_set(&osb->s_num_meta_stolen, 0);
996 status = ocfs2_reserve_suballoc_bits(osb, (*ac),
997 EXTENT_ALLOC_SYSTEM_INODE,
998 (u32)osb->slot_num, NULL,
999 ALLOC_GROUPS_FROM_GLOBAL|ALLOC_NEW_GROUP);
1000
1001
1002 if (status >= 0) {
1003 status = 0;
1004 if (slot != OCFS2_INVALID_SLOT)
1005 ocfs2_init_meta_steal_slot(osb);
1006 goto bail;
1007 } else if (status < 0 && status != -ENOSPC) {
1008 mlog_errno(status);
1009 goto bail;
1010 }
1011
1012 ocfs2_free_ac_resource(*ac);
1013
1014 extent_steal:
1015 status = ocfs2_steal_meta(osb, *ac);
1016 atomic_inc(&osb->s_num_meta_stolen);
1017 if (status < 0) {
1018 if (status != -ENOSPC)
1019 mlog_errno(status);
1020 goto bail;
1021 }
1022
1023 status = 0;
1024 bail:
1025 if ((status < 0) && *ac) {
1026 ocfs2_free_alloc_context(*ac);
1027 *ac = NULL;
1028 }
1029
1030 if (status)
1031 mlog_errno(status);
1032 return status;
1033 }
1034
1035 int ocfs2_reserve_new_metadata(struct ocfs2_super *osb,
1036 struct ocfs2_extent_list *root_el,
1037 struct ocfs2_alloc_context **ac)
1038 {
1039 return ocfs2_reserve_new_metadata_blocks(osb,
1040 ocfs2_extend_meta_needed(root_el),
1041 ac);
1042 }
1043
1044 int ocfs2_reserve_new_inode(struct ocfs2_super *osb,
1045 struct ocfs2_alloc_context **ac)
1046 {
1047 int status;
1048 int slot = ocfs2_get_inode_steal_slot(osb);
1049 u64 alloc_group;
1050
1051 *ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
1052 if (!(*ac)) {
1053 status = -ENOMEM;
1054 mlog_errno(status);
1055 goto bail;
1056 }
1057
1058 (*ac)->ac_bits_wanted = 1;
1059 (*ac)->ac_which = OCFS2_AC_USE_INODE;
1060
1061 (*ac)->ac_group_search = ocfs2_block_group_search;
1062
1063 /*
1064 * stat(2) can't handle i_ino > 32bits, so we tell the
1065 * lower levels not to allocate us a block group past that
1066 * limit. The 'inode64' mount option avoids this behavior.
1067 */
1068 if (!(osb->s_mount_opt & OCFS2_MOUNT_INODE64))
1069 (*ac)->ac_max_block = (u32)~0U;
1070
1071 /*
1072 * slot is set when we successfully steal inode from other nodes.
1073 * It is reset in 3 places:
1074 * 1. when we flush the truncate log
1075 * 2. when we complete local alloc recovery.
1076 * 3. when we successfully allocate from our own slot.
1077 * After it is set, we will go on stealing inodes until we find the
1078 * need to check our slots to see whether there is some space for us.
1079 */
1080 if (slot != OCFS2_INVALID_SLOT &&
1081 atomic_read(&osb->s_num_inodes_stolen) < OCFS2_MAX_TO_STEAL)
1082 goto inode_steal;
1083
1084 atomic_set(&osb->s_num_inodes_stolen, 0);
1085 alloc_group = osb->osb_inode_alloc_group;
1086 status = ocfs2_reserve_suballoc_bits(osb, *ac,
1087 INODE_ALLOC_SYSTEM_INODE,
1088 (u32)osb->slot_num,
1089 &alloc_group,
1090 ALLOC_NEW_GROUP |
1091 ALLOC_GROUPS_FROM_GLOBAL);
1092 if (status >= 0) {
1093 status = 0;
1094
1095 spin_lock(&osb->osb_lock);
1096 osb->osb_inode_alloc_group = alloc_group;
1097 spin_unlock(&osb->osb_lock);
1098 trace_ocfs2_reserve_new_inode_new_group(
1099 (unsigned long long)alloc_group);
1100
1101 /*
1102 * Some inodes must be freed by us, so try to allocate
1103 * from our own next time.
1104 */
1105 if (slot != OCFS2_INVALID_SLOT)
1106 ocfs2_init_inode_steal_slot(osb);
1107 goto bail;
1108 } else if (status < 0 && status != -ENOSPC) {
1109 mlog_errno(status);
1110 goto bail;
1111 }
1112
1113 ocfs2_free_ac_resource(*ac);
1114
1115 inode_steal:
1116 status = ocfs2_steal_inode(osb, *ac);
1117 atomic_inc(&osb->s_num_inodes_stolen);
1118 if (status < 0) {
1119 if (status != -ENOSPC)
1120 mlog_errno(status);
1121 goto bail;
1122 }
1123
1124 status = 0;
1125 bail:
1126 if ((status < 0) && *ac) {
1127 ocfs2_free_alloc_context(*ac);
1128 *ac = NULL;
1129 }
1130
1131 if (status)
1132 mlog_errno(status);
1133 return status;
1134 }
1135
1136 /* local alloc code has to do the same thing, so rather than do this
1137 * twice.. */
1138 int ocfs2_reserve_cluster_bitmap_bits(struct ocfs2_super *osb,
1139 struct ocfs2_alloc_context *ac)
1140 {
1141 int status;
1142
1143 ac->ac_which = OCFS2_AC_USE_MAIN;
1144 ac->ac_group_search = ocfs2_cluster_group_search;
1145
1146 status = ocfs2_reserve_suballoc_bits(osb, ac,
1147 GLOBAL_BITMAP_SYSTEM_INODE,
1148 OCFS2_INVALID_SLOT, NULL,
1149 ALLOC_NEW_GROUP);
1150 if (status < 0 && status != -ENOSPC) {
1151 mlog_errno(status);
1152 goto bail;
1153 }
1154
1155 bail:
1156 return status;
1157 }
1158
1159 /* Callers don't need to care which bitmap (local alloc or main) to
1160 * use so we figure it out for them, but unfortunately this clutters
1161 * things a bit. */
1162 static int ocfs2_reserve_clusters_with_limit(struct ocfs2_super *osb,
1163 u32 bits_wanted, u64 max_block,
1164 int flags,
1165 struct ocfs2_alloc_context **ac)
1166 {
1167 int status;
1168
1169 *ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
1170 if (!(*ac)) {
1171 status = -ENOMEM;
1172 mlog_errno(status);
1173 goto bail;
1174 }
1175
1176 (*ac)->ac_bits_wanted = bits_wanted;
1177 (*ac)->ac_max_block = max_block;
1178
1179 status = -ENOSPC;
1180 if (!(flags & ALLOC_GROUPS_FROM_GLOBAL) &&
1181 ocfs2_alloc_should_use_local(osb, bits_wanted)) {
1182 status = ocfs2_reserve_local_alloc_bits(osb,
1183 bits_wanted,
1184 *ac);
1185 if ((status < 0) && (status != -ENOSPC)) {
1186 mlog_errno(status);
1187 goto bail;
1188 }
1189 }
1190
1191 if (status == -ENOSPC) {
1192 status = ocfs2_reserve_cluster_bitmap_bits(osb, *ac);
1193 if (status < 0) {
1194 if (status != -ENOSPC)
1195 mlog_errno(status);
1196 goto bail;
1197 }
1198 }
1199
1200 status = 0;
1201 bail:
1202 if ((status < 0) && *ac) {
1203 ocfs2_free_alloc_context(*ac);
1204 *ac = NULL;
1205 }
1206
1207 if (status)
1208 mlog_errno(status);
1209 return status;
1210 }
1211
1212 int ocfs2_reserve_clusters(struct ocfs2_super *osb,
1213 u32 bits_wanted,
1214 struct ocfs2_alloc_context **ac)
1215 {
1216 return ocfs2_reserve_clusters_with_limit(osb, bits_wanted, 0,
1217 ALLOC_NEW_GROUP, ac);
1218 }
1219
1220 /*
1221 * More or less lifted from ext3. I'll leave their description below:
1222 *
1223 * "For ext3 allocations, we must not reuse any blocks which are
1224 * allocated in the bitmap buffer's "last committed data" copy. This
1225 * prevents deletes from freeing up the page for reuse until we have
1226 * committed the delete transaction.
1227 *
1228 * If we didn't do this, then deleting something and reallocating it as
1229 * data would allow the old block to be overwritten before the
1230 * transaction committed (because we force data to disk before commit).
1231 * This would lead to corruption if we crashed between overwriting the
1232 * data and committing the delete.
1233 *
1234 * @@@ We may want to make this allocation behaviour conditional on
1235 * data-writes at some point, and disable it for metadata allocations or
1236 * sync-data inodes."
1237 *
1238 * Note: OCFS2 already does this differently for metadata vs data
1239 * allocations, as those bitmaps are separate and undo access is never
1240 * called on a metadata group descriptor.
1241 */
1242 static int ocfs2_test_bg_bit_allocatable(struct buffer_head *bg_bh,
1243 int nr)
1244 {
1245 struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data;
1246 int ret;
1247
1248 if (ocfs2_test_bit(nr, (unsigned long *)bg->bg_bitmap))
1249 return 0;
1250
1251 if (!buffer_jbd(bg_bh))
1252 return 1;
1253
1254 jbd_lock_bh_state(bg_bh);
1255 bg = (struct ocfs2_group_desc *) bh2jh(bg_bh)->b_committed_data;
1256 if (bg)
1257 ret = !ocfs2_test_bit(nr, (unsigned long *)bg->bg_bitmap);
1258 else
1259 ret = 1;
1260 jbd_unlock_bh_state(bg_bh);
1261
1262 return ret;
1263 }
1264
1265 static int ocfs2_block_group_find_clear_bits(struct ocfs2_super *osb,
1266 struct buffer_head *bg_bh,
1267 unsigned int bits_wanted,
1268 unsigned int total_bits,
1269 struct ocfs2_suballoc_result *res)
1270 {
1271 void *bitmap;
1272 u16 best_offset, best_size;
1273 int offset, start, found, status = 0;
1274 struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data;
1275
1276 /* Callers got this descriptor from
1277 * ocfs2_read_group_descriptor(). Any corruption is a code bug. */
1278 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
1279
1280 found = start = best_offset = best_size = 0;
1281 bitmap = bg->bg_bitmap;
1282
1283 while((offset = ocfs2_find_next_zero_bit(bitmap, total_bits, start)) != -1) {
1284 if (offset == total_bits)
1285 break;
1286
1287 if (!ocfs2_test_bg_bit_allocatable(bg_bh, offset)) {
1288 /* We found a zero, but we can't use it as it
1289 * hasn't been put to disk yet! */
1290 found = 0;
1291 start = offset + 1;
1292 } else if (offset == start) {
1293 /* we found a zero */
1294 found++;
1295 /* move start to the next bit to test */
1296 start++;
1297 } else {
1298 /* got a zero after some ones */
1299 found = 1;
1300 start = offset + 1;
1301 }
1302 if (found > best_size) {
1303 best_size = found;
1304 best_offset = start - found;
1305 }
1306 /* we got everything we needed */
1307 if (found == bits_wanted) {
1308 /* mlog(0, "Found it all!\n"); */
1309 break;
1310 }
1311 }
1312
1313 if (best_size) {
1314 res->sr_bit_offset = best_offset;
1315 res->sr_bits = best_size;
1316 } else {
1317 status = -ENOSPC;
1318 /* No error log here -- see the comment above
1319 * ocfs2_test_bg_bit_allocatable */
1320 }
1321
1322 return status;
1323 }
1324
1325 int ocfs2_block_group_set_bits(handle_t *handle,
1326 struct inode *alloc_inode,
1327 struct ocfs2_group_desc *bg,
1328 struct buffer_head *group_bh,
1329 unsigned int bit_off,
1330 unsigned int num_bits)
1331 {
1332 int status;
1333 void *bitmap = bg->bg_bitmap;
1334 int journal_type = OCFS2_JOURNAL_ACCESS_WRITE;
1335
1336 /* All callers get the descriptor via
1337 * ocfs2_read_group_descriptor(). Any corruption is a code bug. */
1338 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
1339 BUG_ON(le16_to_cpu(bg->bg_free_bits_count) < num_bits);
1340
1341 trace_ocfs2_block_group_set_bits(bit_off, num_bits);
1342
1343 if (ocfs2_is_cluster_bitmap(alloc_inode))
1344 journal_type = OCFS2_JOURNAL_ACCESS_UNDO;
1345
1346 status = ocfs2_journal_access_gd(handle,
1347 INODE_CACHE(alloc_inode),
1348 group_bh,
1349 journal_type);
1350 if (status < 0) {
1351 mlog_errno(status);
1352 goto bail;
1353 }
1354
1355 le16_add_cpu(&bg->bg_free_bits_count, -num_bits);
1356 if (le16_to_cpu(bg->bg_free_bits_count) > le16_to_cpu(bg->bg_bits)) {
1357 return ocfs2_error(alloc_inode->i_sb, "Group descriptor # %llu has bit count %u but claims %u are freed. num_bits %d\n",
1358 (unsigned long long)le64_to_cpu(bg->bg_blkno),
1359 le16_to_cpu(bg->bg_bits),
1360 le16_to_cpu(bg->bg_free_bits_count),
1361 num_bits);
1362 }
1363 while(num_bits--)
1364 ocfs2_set_bit(bit_off++, bitmap);
1365
1366 ocfs2_journal_dirty(handle, group_bh);
1367
1368 bail:
1369 return status;
1370 }
1371
1372 /* find the one with the most empty bits */
1373 static inline u16 ocfs2_find_victim_chain(struct ocfs2_chain_list *cl)
1374 {
1375 u16 curr, best;
1376
1377 BUG_ON(!cl->cl_next_free_rec);
1378
1379 best = curr = 0;
1380 while (curr < le16_to_cpu(cl->cl_next_free_rec)) {
1381 if (le32_to_cpu(cl->cl_recs[curr].c_free) >
1382 le32_to_cpu(cl->cl_recs[best].c_free))
1383 best = curr;
1384 curr++;
1385 }
1386
1387 BUG_ON(best >= le16_to_cpu(cl->cl_next_free_rec));
1388 return best;
1389 }
1390
1391 static int ocfs2_relink_block_group(handle_t *handle,
1392 struct inode *alloc_inode,
1393 struct buffer_head *fe_bh,
1394 struct buffer_head *bg_bh,
1395 struct buffer_head *prev_bg_bh,
1396 u16 chain)
1397 {
1398 int status;
1399 /* there is a really tiny chance the journal calls could fail,
1400 * but we wouldn't want inconsistent blocks in *any* case. */
1401 u64 bg_ptr, prev_bg_ptr;
1402 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) fe_bh->b_data;
1403 struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data;
1404 struct ocfs2_group_desc *prev_bg = (struct ocfs2_group_desc *) prev_bg_bh->b_data;
1405
1406 /* The caller got these descriptors from
1407 * ocfs2_read_group_descriptor(). Any corruption is a code bug. */
1408 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
1409 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(prev_bg));
1410
1411 trace_ocfs2_relink_block_group(
1412 (unsigned long long)le64_to_cpu(fe->i_blkno), chain,
1413 (unsigned long long)le64_to_cpu(bg->bg_blkno),
1414 (unsigned long long)le64_to_cpu(prev_bg->bg_blkno));
1415
1416 bg_ptr = le64_to_cpu(bg->bg_next_group);
1417 prev_bg_ptr = le64_to_cpu(prev_bg->bg_next_group);
1418
1419 status = ocfs2_journal_access_gd(handle, INODE_CACHE(alloc_inode),
1420 prev_bg_bh,
1421 OCFS2_JOURNAL_ACCESS_WRITE);
1422 if (status < 0)
1423 goto out;
1424
1425 prev_bg->bg_next_group = bg->bg_next_group;
1426 ocfs2_journal_dirty(handle, prev_bg_bh);
1427
1428 status = ocfs2_journal_access_gd(handle, INODE_CACHE(alloc_inode),
1429 bg_bh, OCFS2_JOURNAL_ACCESS_WRITE);
1430 if (status < 0)
1431 goto out_rollback_prev_bg;
1432
1433 bg->bg_next_group = fe->id2.i_chain.cl_recs[chain].c_blkno;
1434 ocfs2_journal_dirty(handle, bg_bh);
1435
1436 status = ocfs2_journal_access_di(handle, INODE_CACHE(alloc_inode),
1437 fe_bh, OCFS2_JOURNAL_ACCESS_WRITE);
1438 if (status < 0)
1439 goto out_rollback_bg;
1440
1441 fe->id2.i_chain.cl_recs[chain].c_blkno = bg->bg_blkno;
1442 ocfs2_journal_dirty(handle, fe_bh);
1443
1444 out:
1445 if (status < 0)
1446 mlog_errno(status);
1447 return status;
1448
1449 out_rollback_bg:
1450 bg->bg_next_group = cpu_to_le64(bg_ptr);
1451 out_rollback_prev_bg:
1452 prev_bg->bg_next_group = cpu_to_le64(prev_bg_ptr);
1453 goto out;
1454 }
1455
1456 static inline int ocfs2_block_group_reasonably_empty(struct ocfs2_group_desc *bg,
1457 u32 wanted)
1458 {
1459 return le16_to_cpu(bg->bg_free_bits_count) > wanted;
1460 }
1461
1462 /* return 0 on success, -ENOSPC to keep searching and any other < 0
1463 * value on error. */
1464 static int ocfs2_cluster_group_search(struct inode *inode,
1465 struct buffer_head *group_bh,
1466 u32 bits_wanted, u32 min_bits,
1467 u64 max_block,
1468 struct ocfs2_suballoc_result *res)
1469 {
1470 int search = -ENOSPC;
1471 int ret;
1472 u64 blkoff;
1473 struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *) group_bh->b_data;
1474 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1475 unsigned int max_bits, gd_cluster_off;
1476
1477 BUG_ON(!ocfs2_is_cluster_bitmap(inode));
1478
1479 if (gd->bg_free_bits_count) {
1480 max_bits = le16_to_cpu(gd->bg_bits);
1481
1482 /* Tail groups in cluster bitmaps which aren't cpg
1483 * aligned are prone to partial extension by a failed
1484 * fs resize. If the file system resize never got to
1485 * update the dinode cluster count, then we don't want
1486 * to trust any clusters past it, regardless of what
1487 * the group descriptor says. */
1488 gd_cluster_off = ocfs2_blocks_to_clusters(inode->i_sb,
1489 le64_to_cpu(gd->bg_blkno));
1490 if ((gd_cluster_off + max_bits) >
1491 OCFS2_I(inode)->ip_clusters) {
1492 max_bits = OCFS2_I(inode)->ip_clusters - gd_cluster_off;
1493 trace_ocfs2_cluster_group_search_wrong_max_bits(
1494 (unsigned long long)le64_to_cpu(gd->bg_blkno),
1495 le16_to_cpu(gd->bg_bits),
1496 OCFS2_I(inode)->ip_clusters, max_bits);
1497 }
1498
1499 ret = ocfs2_block_group_find_clear_bits(OCFS2_SB(inode->i_sb),
1500 group_bh, bits_wanted,
1501 max_bits, res);
1502 if (ret)
1503 return ret;
1504
1505 if (max_block) {
1506 blkoff = ocfs2_clusters_to_blocks(inode->i_sb,
1507 gd_cluster_off +
1508 res->sr_bit_offset +
1509 res->sr_bits);
1510 trace_ocfs2_cluster_group_search_max_block(
1511 (unsigned long long)blkoff,
1512 (unsigned long long)max_block);
1513 if (blkoff > max_block)
1514 return -ENOSPC;
1515 }
1516
1517 /* ocfs2_block_group_find_clear_bits() might
1518 * return success, but we still want to return
1519 * -ENOSPC unless it found the minimum number
1520 * of bits. */
1521 if (min_bits <= res->sr_bits)
1522 search = 0; /* success */
1523 else if (res->sr_bits) {
1524 /*
1525 * Don't show bits which we'll be returning
1526 * for allocation to the local alloc bitmap.
1527 */
1528 ocfs2_local_alloc_seen_free_bits(osb, res->sr_bits);
1529 }
1530 }
1531
1532 return search;
1533 }
1534
1535 static int ocfs2_block_group_search(struct inode *inode,
1536 struct buffer_head *group_bh,
1537 u32 bits_wanted, u32 min_bits,
1538 u64 max_block,
1539 struct ocfs2_suballoc_result *res)
1540 {
1541 int ret = -ENOSPC;
1542 u64 blkoff;
1543 struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) group_bh->b_data;
1544
1545 BUG_ON(min_bits != 1);
1546 BUG_ON(ocfs2_is_cluster_bitmap(inode));
1547
1548 if (bg->bg_free_bits_count) {
1549 ret = ocfs2_block_group_find_clear_bits(OCFS2_SB(inode->i_sb),
1550 group_bh, bits_wanted,
1551 le16_to_cpu(bg->bg_bits),
1552 res);
1553 if (!ret && max_block) {
1554 blkoff = le64_to_cpu(bg->bg_blkno) +
1555 res->sr_bit_offset + res->sr_bits;
1556 trace_ocfs2_block_group_search_max_block(
1557 (unsigned long long)blkoff,
1558 (unsigned long long)max_block);
1559 if (blkoff > max_block)
1560 ret = -ENOSPC;
1561 }
1562 }
1563
1564 return ret;
1565 }
1566
1567 int ocfs2_alloc_dinode_update_counts(struct inode *inode,
1568 handle_t *handle,
1569 struct buffer_head *di_bh,
1570 u32 num_bits,
1571 u16 chain)
1572 {
1573 int ret;
1574 u32 tmp_used;
1575 struct ocfs2_dinode *di = (struct ocfs2_dinode *) di_bh->b_data;
1576 struct ocfs2_chain_list *cl = (struct ocfs2_chain_list *) &di->id2.i_chain;
1577
1578 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
1579 OCFS2_JOURNAL_ACCESS_WRITE);
1580 if (ret < 0) {
1581 mlog_errno(ret);
1582 goto out;
1583 }
1584
1585 tmp_used = le32_to_cpu(di->id1.bitmap1.i_used);
1586 di->id1.bitmap1.i_used = cpu_to_le32(num_bits + tmp_used);
1587 le32_add_cpu(&cl->cl_recs[chain].c_free, -num_bits);
1588 ocfs2_journal_dirty(handle, di_bh);
1589
1590 out:
1591 return ret;
1592 }
1593
1594 void ocfs2_rollback_alloc_dinode_counts(struct inode *inode,
1595 struct buffer_head *di_bh,
1596 u32 num_bits,
1597 u16 chain)
1598 {
1599 u32 tmp_used;
1600 struct ocfs2_dinode *di = (struct ocfs2_dinode *) di_bh->b_data;
1601 struct ocfs2_chain_list *cl;
1602
1603 cl = (struct ocfs2_chain_list *)&di->id2.i_chain;
1604 tmp_used = le32_to_cpu(di->id1.bitmap1.i_used);
1605 di->id1.bitmap1.i_used = cpu_to_le32(tmp_used - num_bits);
1606 le32_add_cpu(&cl->cl_recs[chain].c_free, num_bits);
1607 }
1608
1609 static int ocfs2_bg_discontig_fix_by_rec(struct ocfs2_suballoc_result *res,
1610 struct ocfs2_extent_rec *rec,
1611 struct ocfs2_chain_list *cl)
1612 {
1613 unsigned int bpc = le16_to_cpu(cl->cl_bpc);
1614 unsigned int bitoff = le32_to_cpu(rec->e_cpos) * bpc;
1615 unsigned int bitcount = le16_to_cpu(rec->e_leaf_clusters) * bpc;
1616
1617 if (res->sr_bit_offset < bitoff)
1618 return 0;
1619 if (res->sr_bit_offset >= (bitoff + bitcount))
1620 return 0;
1621 res->sr_blkno = le64_to_cpu(rec->e_blkno) +
1622 (res->sr_bit_offset - bitoff);
1623 if ((res->sr_bit_offset + res->sr_bits) > (bitoff + bitcount))
1624 res->sr_bits = (bitoff + bitcount) - res->sr_bit_offset;
1625 return 1;
1626 }
1627
1628 static void ocfs2_bg_discontig_fix_result(struct ocfs2_alloc_context *ac,
1629 struct ocfs2_group_desc *bg,
1630 struct ocfs2_suballoc_result *res)
1631 {
1632 int i;
1633 u64 bg_blkno = res->sr_bg_blkno; /* Save off */
1634 struct ocfs2_extent_rec *rec;
1635 struct ocfs2_dinode *di = (struct ocfs2_dinode *)ac->ac_bh->b_data;
1636 struct ocfs2_chain_list *cl = &di->id2.i_chain;
1637
1638 if (ocfs2_is_cluster_bitmap(ac->ac_inode)) {
1639 res->sr_blkno = 0;
1640 return;
1641 }
1642
1643 res->sr_blkno = res->sr_bg_blkno + res->sr_bit_offset;
1644 res->sr_bg_blkno = 0; /* Clear it for contig block groups */
1645 if (!ocfs2_supports_discontig_bg(OCFS2_SB(ac->ac_inode->i_sb)) ||
1646 !bg->bg_list.l_next_free_rec)
1647 return;
1648
1649 for (i = 0; i < le16_to_cpu(bg->bg_list.l_next_free_rec); i++) {
1650 rec = &bg->bg_list.l_recs[i];
1651 if (ocfs2_bg_discontig_fix_by_rec(res, rec, cl)) {
1652 res->sr_bg_blkno = bg_blkno; /* Restore */
1653 break;
1654 }
1655 }
1656 }
1657
1658 static int ocfs2_search_one_group(struct ocfs2_alloc_context *ac,
1659 handle_t *handle,
1660 u32 bits_wanted,
1661 u32 min_bits,
1662 struct ocfs2_suballoc_result *res,
1663 u16 *bits_left)
1664 {
1665 int ret;
1666 struct buffer_head *group_bh = NULL;
1667 struct ocfs2_group_desc *gd;
1668 struct ocfs2_dinode *di = (struct ocfs2_dinode *)ac->ac_bh->b_data;
1669 struct inode *alloc_inode = ac->ac_inode;
1670
1671 ret = ocfs2_read_group_descriptor(alloc_inode, di,
1672 res->sr_bg_blkno, &group_bh);
1673 if (ret < 0) {
1674 mlog_errno(ret);
1675 return ret;
1676 }
1677
1678 gd = (struct ocfs2_group_desc *) group_bh->b_data;
1679 ret = ac->ac_group_search(alloc_inode, group_bh, bits_wanted, min_bits,
1680 ac->ac_max_block, res);
1681 if (ret < 0) {
1682 if (ret != -ENOSPC)
1683 mlog_errno(ret);
1684 goto out;
1685 }
1686
1687 if (!ret)
1688 ocfs2_bg_discontig_fix_result(ac, gd, res);
1689
1690 /*
1691 * sr_bg_blkno might have been changed by
1692 * ocfs2_bg_discontig_fix_result
1693 */
1694 res->sr_bg_stable_blkno = group_bh->b_blocknr;
1695
1696 if (ac->ac_find_loc_only)
1697 goto out_loc_only;
1698
1699 ret = ocfs2_alloc_dinode_update_counts(alloc_inode, handle, ac->ac_bh,
1700 res->sr_bits,
1701 le16_to_cpu(gd->bg_chain));
1702 if (ret < 0) {
1703 mlog_errno(ret);
1704 goto out;
1705 }
1706
1707 ret = ocfs2_block_group_set_bits(handle, alloc_inode, gd, group_bh,
1708 res->sr_bit_offset, res->sr_bits);
1709 if (ret < 0) {
1710 ocfs2_rollback_alloc_dinode_counts(alloc_inode, ac->ac_bh,
1711 res->sr_bits,
1712 le16_to_cpu(gd->bg_chain));
1713 mlog_errno(ret);
1714 }
1715
1716 out_loc_only:
1717 *bits_left = le16_to_cpu(gd->bg_free_bits_count);
1718
1719 out:
1720 brelse(group_bh);
1721
1722 return ret;
1723 }
1724
1725 static int ocfs2_search_chain(struct ocfs2_alloc_context *ac,
1726 handle_t *handle,
1727 u32 bits_wanted,
1728 u32 min_bits,
1729 struct ocfs2_suballoc_result *res,
1730 u16 *bits_left)
1731 {
1732 int status;
1733 u16 chain;
1734 u64 next_group;
1735 struct inode *alloc_inode = ac->ac_inode;
1736 struct buffer_head *group_bh = NULL;
1737 struct buffer_head *prev_group_bh = NULL;
1738 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) ac->ac_bh->b_data;
1739 struct ocfs2_chain_list *cl = (struct ocfs2_chain_list *) &fe->id2.i_chain;
1740 struct ocfs2_group_desc *bg;
1741
1742 chain = ac->ac_chain;
1743 trace_ocfs2_search_chain_begin(
1744 (unsigned long long)OCFS2_I(alloc_inode)->ip_blkno,
1745 bits_wanted, chain);
1746
1747 status = ocfs2_read_group_descriptor(alloc_inode, fe,
1748 le64_to_cpu(cl->cl_recs[chain].c_blkno),
1749 &group_bh);
1750 if (status < 0) {
1751 mlog_errno(status);
1752 goto bail;
1753 }
1754 bg = (struct ocfs2_group_desc *) group_bh->b_data;
1755
1756 status = -ENOSPC;
1757 /* for now, the chain search is a bit simplistic. We just use
1758 * the 1st group with any empty bits. */
1759 while ((status = ac->ac_group_search(alloc_inode, group_bh,
1760 bits_wanted, min_bits,
1761 ac->ac_max_block,
1762 res)) == -ENOSPC) {
1763 if (!bg->bg_next_group)
1764 break;
1765
1766 brelse(prev_group_bh);
1767 prev_group_bh = NULL;
1768
1769 next_group = le64_to_cpu(bg->bg_next_group);
1770 prev_group_bh = group_bh;
1771 group_bh = NULL;
1772 status = ocfs2_read_group_descriptor(alloc_inode, fe,
1773 next_group, &group_bh);
1774 if (status < 0) {
1775 mlog_errno(status);
1776 goto bail;
1777 }
1778 bg = (struct ocfs2_group_desc *) group_bh->b_data;
1779 }
1780 if (status < 0) {
1781 if (status != -ENOSPC)
1782 mlog_errno(status);
1783 goto bail;
1784 }
1785
1786 trace_ocfs2_search_chain_succ(
1787 (unsigned long long)le64_to_cpu(bg->bg_blkno), res->sr_bits);
1788
1789 res->sr_bg_blkno = le64_to_cpu(bg->bg_blkno);
1790
1791 BUG_ON(res->sr_bits == 0);
1792 if (!status)
1793 ocfs2_bg_discontig_fix_result(ac, bg, res);
1794
1795 /*
1796 * sr_bg_blkno might have been changed by
1797 * ocfs2_bg_discontig_fix_result
1798 */
1799 res->sr_bg_stable_blkno = group_bh->b_blocknr;
1800
1801 /*
1802 * Keep track of previous block descriptor read. When
1803 * we find a target, if we have read more than X
1804 * number of descriptors, and the target is reasonably
1805 * empty, relink him to top of his chain.
1806 *
1807 * We've read 0 extra blocks and only send one more to
1808 * the transaction, yet the next guy to search has a
1809 * much easier time.
1810 *
1811 * Do this *after* figuring out how many bits we're taking out
1812 * of our target group.
1813 */
1814 if (!ac->ac_disable_chain_relink &&
1815 (prev_group_bh) &&
1816 (ocfs2_block_group_reasonably_empty(bg, res->sr_bits))) {
1817 status = ocfs2_relink_block_group(handle, alloc_inode,
1818 ac->ac_bh, group_bh,
1819 prev_group_bh, chain);
1820 if (status < 0) {
1821 mlog_errno(status);
1822 goto bail;
1823 }
1824 }
1825
1826 if (ac->ac_find_loc_only)
1827 goto out_loc_only;
1828
1829 status = ocfs2_alloc_dinode_update_counts(alloc_inode, handle,
1830 ac->ac_bh, res->sr_bits,
1831 chain);
1832 if (status) {
1833 mlog_errno(status);
1834 goto bail;
1835 }
1836
1837 status = ocfs2_block_group_set_bits(handle,
1838 alloc_inode,
1839 bg,
1840 group_bh,
1841 res->sr_bit_offset,
1842 res->sr_bits);
1843 if (status < 0) {
1844 ocfs2_rollback_alloc_dinode_counts(alloc_inode,
1845 ac->ac_bh, res->sr_bits, chain);
1846 mlog_errno(status);
1847 goto bail;
1848 }
1849
1850 trace_ocfs2_search_chain_end(
1851 (unsigned long long)le64_to_cpu(fe->i_blkno),
1852 res->sr_bits);
1853
1854 out_loc_only:
1855 *bits_left = le16_to_cpu(bg->bg_free_bits_count);
1856 bail:
1857 brelse(group_bh);
1858 brelse(prev_group_bh);
1859
1860 if (status)
1861 mlog_errno(status);
1862 return status;
1863 }
1864
1865 /* will give out up to bits_wanted contiguous bits. */
1866 static int ocfs2_claim_suballoc_bits(struct ocfs2_alloc_context *ac,
1867 handle_t *handle,
1868 u32 bits_wanted,
1869 u32 min_bits,
1870 struct ocfs2_suballoc_result *res)
1871 {
1872 int status;
1873 u16 victim, i;
1874 u16 bits_left = 0;
1875 u64 hint = ac->ac_last_group;
1876 struct ocfs2_chain_list *cl;
1877 struct ocfs2_dinode *fe;
1878
1879 BUG_ON(ac->ac_bits_given >= ac->ac_bits_wanted);
1880 BUG_ON(bits_wanted > (ac->ac_bits_wanted - ac->ac_bits_given));
1881 BUG_ON(!ac->ac_bh);
1882
1883 fe = (struct ocfs2_dinode *) ac->ac_bh->b_data;
1884
1885 /* The bh was validated by the inode read during
1886 * ocfs2_reserve_suballoc_bits(). Any corruption is a code bug. */
1887 BUG_ON(!OCFS2_IS_VALID_DINODE(fe));
1888
1889 if (le32_to_cpu(fe->id1.bitmap1.i_used) >=
1890 le32_to_cpu(fe->id1.bitmap1.i_total)) {
1891 status = ocfs2_error(ac->ac_inode->i_sb,
1892 "Chain allocator dinode %llu has %u used bits but only %u total\n",
1893 (unsigned long long)le64_to_cpu(fe->i_blkno),
1894 le32_to_cpu(fe->id1.bitmap1.i_used),
1895 le32_to_cpu(fe->id1.bitmap1.i_total));
1896 goto bail;
1897 }
1898
1899 res->sr_bg_blkno = hint;
1900 if (res->sr_bg_blkno) {
1901 /* Attempt to short-circuit the usual search mechanism
1902 * by jumping straight to the most recently used
1903 * allocation group. This helps us maintain some
1904 * contiguousness across allocations. */
1905 status = ocfs2_search_one_group(ac, handle, bits_wanted,
1906 min_bits, res, &bits_left);
1907 if (!status)
1908 goto set_hint;
1909 if (status < 0 && status != -ENOSPC) {
1910 mlog_errno(status);
1911 goto bail;
1912 }
1913 }
1914
1915 cl = (struct ocfs2_chain_list *) &fe->id2.i_chain;
1916
1917 victim = ocfs2_find_victim_chain(cl);
1918 ac->ac_chain = victim;
1919
1920 status = ocfs2_search_chain(ac, handle, bits_wanted, min_bits,
1921 res, &bits_left);
1922 if (!status) {
1923 if (ocfs2_is_cluster_bitmap(ac->ac_inode))
1924 hint = res->sr_bg_blkno;
1925 else
1926 hint = ocfs2_group_from_res(res);
1927 goto set_hint;
1928 }
1929 if (status < 0 && status != -ENOSPC) {
1930 mlog_errno(status);
1931 goto bail;
1932 }
1933
1934 trace_ocfs2_claim_suballoc_bits(victim);
1935
1936 /* If we didn't pick a good victim, then just default to
1937 * searching each chain in order. Don't allow chain relinking
1938 * because we only calculate enough journal credits for one
1939 * relink per alloc. */
1940 ac->ac_disable_chain_relink = 1;
1941 for (i = 0; i < le16_to_cpu(cl->cl_next_free_rec); i ++) {
1942 if (i == victim)
1943 continue;
1944 if (!cl->cl_recs[i].c_free)
1945 continue;
1946
1947 ac->ac_chain = i;
1948 status = ocfs2_search_chain(ac, handle, bits_wanted, min_bits,
1949 res, &bits_left);
1950 if (!status) {
1951 hint = ocfs2_group_from_res(res);
1952 break;
1953 }
1954 if (status < 0 && status != -ENOSPC) {
1955 mlog_errno(status);
1956 goto bail;
1957 }
1958 }
1959
1960 set_hint:
1961 if (status != -ENOSPC) {
1962 /* If the next search of this group is not likely to
1963 * yield a suitable extent, then we reset the last
1964 * group hint so as to not waste a disk read */
1965 if (bits_left < min_bits)
1966 ac->ac_last_group = 0;
1967 else
1968 ac->ac_last_group = hint;
1969 }
1970
1971 bail:
1972 if (status)
1973 mlog_errno(status);
1974 return status;
1975 }
1976
1977 int ocfs2_claim_metadata(handle_t *handle,
1978 struct ocfs2_alloc_context *ac,
1979 u32 bits_wanted,
1980 u64 *suballoc_loc,
1981 u16 *suballoc_bit_start,
1982 unsigned int *num_bits,
1983 u64 *blkno_start)
1984 {
1985 int status;
1986 struct ocfs2_suballoc_result res = { .sr_blkno = 0, };
1987
1988 BUG_ON(!ac);
1989 BUG_ON(ac->ac_bits_wanted < (ac->ac_bits_given + bits_wanted));
1990 BUG_ON(ac->ac_which != OCFS2_AC_USE_META);
1991
1992 status = ocfs2_claim_suballoc_bits(ac,
1993 handle,
1994 bits_wanted,
1995 1,
1996 &res);
1997 if (status < 0) {
1998 mlog_errno(status);
1999 goto bail;
2000 }
2001 atomic_inc(&OCFS2_SB(ac->ac_inode->i_sb)->alloc_stats.bg_allocs);
2002
2003 *suballoc_loc = res.sr_bg_blkno;
2004 *suballoc_bit_start = res.sr_bit_offset;
2005 *blkno_start = res.sr_blkno;
2006 ac->ac_bits_given += res.sr_bits;
2007 *num_bits = res.sr_bits;
2008 status = 0;
2009 bail:
2010 if (status)
2011 mlog_errno(status);
2012 return status;
2013 }
2014
2015 static void ocfs2_init_inode_ac_group(struct inode *dir,
2016 struct buffer_head *parent_di_bh,
2017 struct ocfs2_alloc_context *ac)
2018 {
2019 struct ocfs2_dinode *di = (struct ocfs2_dinode *)parent_di_bh->b_data;
2020 /*
2021 * Try to allocate inodes from some specific group.
2022 *
2023 * If the parent dir has recorded the last group used in allocation,
2024 * cool, use it. Otherwise if we try to allocate new inode from the
2025 * same slot the parent dir belongs to, use the same chunk.
2026 *
2027 * We are very careful here to avoid the mistake of setting
2028 * ac_last_group to a group descriptor from a different (unlocked) slot.
2029 */
2030 if (OCFS2_I(dir)->ip_last_used_group &&
2031 OCFS2_I(dir)->ip_last_used_slot == ac->ac_alloc_slot)
2032 ac->ac_last_group = OCFS2_I(dir)->ip_last_used_group;
2033 else if (le16_to_cpu(di->i_suballoc_slot) == ac->ac_alloc_slot) {
2034 if (di->i_suballoc_loc)
2035 ac->ac_last_group = le64_to_cpu(di->i_suballoc_loc);
2036 else
2037 ac->ac_last_group = ocfs2_which_suballoc_group(
2038 le64_to_cpu(di->i_blkno),
2039 le16_to_cpu(di->i_suballoc_bit));
2040 }
2041 }
2042
2043 static inline void ocfs2_save_inode_ac_group(struct inode *dir,
2044 struct ocfs2_alloc_context *ac)
2045 {
2046 OCFS2_I(dir)->ip_last_used_group = ac->ac_last_group;
2047 OCFS2_I(dir)->ip_last_used_slot = ac->ac_alloc_slot;
2048 }
2049
2050 int ocfs2_find_new_inode_loc(struct inode *dir,
2051 struct buffer_head *parent_fe_bh,
2052 struct ocfs2_alloc_context *ac,
2053 u64 *fe_blkno)
2054 {
2055 int ret;
2056 handle_t *handle = NULL;
2057 struct ocfs2_suballoc_result *res;
2058
2059 BUG_ON(!ac);
2060 BUG_ON(ac->ac_bits_given != 0);
2061 BUG_ON(ac->ac_bits_wanted != 1);
2062 BUG_ON(ac->ac_which != OCFS2_AC_USE_INODE);
2063
2064 res = kzalloc(sizeof(*res), GFP_NOFS);
2065 if (res == NULL) {
2066 ret = -ENOMEM;
2067 mlog_errno(ret);
2068 goto out;
2069 }
2070
2071 ocfs2_init_inode_ac_group(dir, parent_fe_bh, ac);
2072
2073 /*
2074 * The handle started here is for chain relink. Alternatively,
2075 * we could just disable relink for these calls.
2076 */
2077 handle = ocfs2_start_trans(OCFS2_SB(dir->i_sb), OCFS2_SUBALLOC_ALLOC);
2078 if (IS_ERR(handle)) {
2079 ret = PTR_ERR(handle);
2080 handle = NULL;
2081 mlog_errno(ret);
2082 goto out;
2083 }
2084
2085 /*
2086 * This will instruct ocfs2_claim_suballoc_bits and
2087 * ocfs2_search_one_group to search but save actual allocation
2088 * for later.
2089 */
2090 ac->ac_find_loc_only = 1;
2091
2092 ret = ocfs2_claim_suballoc_bits(ac, handle, 1, 1, res);
2093 if (ret < 0) {
2094 mlog_errno(ret);
2095 goto out;
2096 }
2097
2098 ac->ac_find_loc_priv = res;
2099 *fe_blkno = res->sr_blkno;
2100 ocfs2_update_inode_fsync_trans(handle, dir, 0);
2101 out:
2102 if (handle)
2103 ocfs2_commit_trans(OCFS2_SB(dir->i_sb), handle);
2104
2105 if (ret)
2106 kfree(res);
2107
2108 return ret;
2109 }
2110
2111 int ocfs2_claim_new_inode_at_loc(handle_t *handle,
2112 struct inode *dir,
2113 struct ocfs2_alloc_context *ac,
2114 u64 *suballoc_loc,
2115 u16 *suballoc_bit,
2116 u64 di_blkno)
2117 {
2118 int ret;
2119 u16 chain;
2120 struct ocfs2_suballoc_result *res = ac->ac_find_loc_priv;
2121 struct buffer_head *bg_bh = NULL;
2122 struct ocfs2_group_desc *bg;
2123 struct ocfs2_dinode *di = (struct ocfs2_dinode *) ac->ac_bh->b_data;
2124
2125 /*
2126 * Since di_blkno is being passed back in, we check for any
2127 * inconsistencies which may have happened between
2128 * calls. These are code bugs as di_blkno is not expected to
2129 * change once returned from ocfs2_find_new_inode_loc()
2130 */
2131 BUG_ON(res->sr_blkno != di_blkno);
2132
2133 ret = ocfs2_read_group_descriptor(ac->ac_inode, di,
2134 res->sr_bg_stable_blkno, &bg_bh);
2135 if (ret) {
2136 mlog_errno(ret);
2137 goto out;
2138 }
2139
2140 bg = (struct ocfs2_group_desc *) bg_bh->b_data;
2141 chain = le16_to_cpu(bg->bg_chain);
2142
2143 ret = ocfs2_alloc_dinode_update_counts(ac->ac_inode, handle,
2144 ac->ac_bh, res->sr_bits,
2145 chain);
2146 if (ret) {
2147 mlog_errno(ret);
2148 goto out;
2149 }
2150
2151 ret = ocfs2_block_group_set_bits(handle,
2152 ac->ac_inode,
2153 bg,
2154 bg_bh,
2155 res->sr_bit_offset,
2156 res->sr_bits);
2157 if (ret < 0) {
2158 ocfs2_rollback_alloc_dinode_counts(ac->ac_inode,
2159 ac->ac_bh, res->sr_bits, chain);
2160 mlog_errno(ret);
2161 goto out;
2162 }
2163
2164 trace_ocfs2_claim_new_inode_at_loc((unsigned long long)di_blkno,
2165 res->sr_bits);
2166
2167 atomic_inc(&OCFS2_SB(ac->ac_inode->i_sb)->alloc_stats.bg_allocs);
2168
2169 BUG_ON(res->sr_bits != 1);
2170
2171 *suballoc_loc = res->sr_bg_blkno;
2172 *suballoc_bit = res->sr_bit_offset;
2173 ac->ac_bits_given++;
2174 ocfs2_save_inode_ac_group(dir, ac);
2175
2176 out:
2177 brelse(bg_bh);
2178
2179 return ret;
2180 }
2181
2182 int ocfs2_claim_new_inode(handle_t *handle,
2183 struct inode *dir,
2184 struct buffer_head *parent_fe_bh,
2185 struct ocfs2_alloc_context *ac,
2186 u64 *suballoc_loc,
2187 u16 *suballoc_bit,
2188 u64 *fe_blkno)
2189 {
2190 int status;
2191 struct ocfs2_suballoc_result res;
2192
2193 BUG_ON(!ac);
2194 BUG_ON(ac->ac_bits_given != 0);
2195 BUG_ON(ac->ac_bits_wanted != 1);
2196 BUG_ON(ac->ac_which != OCFS2_AC_USE_INODE);
2197
2198 ocfs2_init_inode_ac_group(dir, parent_fe_bh, ac);
2199
2200 status = ocfs2_claim_suballoc_bits(ac,
2201 handle,
2202 1,
2203 1,
2204 &res);
2205 if (status < 0) {
2206 mlog_errno(status);
2207 goto bail;
2208 }
2209 atomic_inc(&OCFS2_SB(ac->ac_inode->i_sb)->alloc_stats.bg_allocs);
2210
2211 BUG_ON(res.sr_bits != 1);
2212
2213 *suballoc_loc = res.sr_bg_blkno;
2214 *suballoc_bit = res.sr_bit_offset;
2215 *fe_blkno = res.sr_blkno;
2216 ac->ac_bits_given++;
2217 ocfs2_save_inode_ac_group(dir, ac);
2218 status = 0;
2219 bail:
2220 if (status)
2221 mlog_errno(status);
2222 return status;
2223 }
2224
2225 /* translate a group desc. blkno and it's bitmap offset into
2226 * disk cluster offset. */
2227 static inline u32 ocfs2_desc_bitmap_to_cluster_off(struct inode *inode,
2228 u64 bg_blkno,
2229 u16 bg_bit_off)
2230 {
2231 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2232 u32 cluster = 0;
2233
2234 BUG_ON(!ocfs2_is_cluster_bitmap(inode));
2235
2236 if (bg_blkno != osb->first_cluster_group_blkno)
2237 cluster = ocfs2_blocks_to_clusters(inode->i_sb, bg_blkno);
2238 cluster += (u32) bg_bit_off;
2239 return cluster;
2240 }
2241
2242 /* given a cluster offset, calculate which block group it belongs to
2243 * and return that block offset. */
2244 u64 ocfs2_which_cluster_group(struct inode *inode, u32 cluster)
2245 {
2246 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2247 u32 group_no;
2248
2249 BUG_ON(!ocfs2_is_cluster_bitmap(inode));
2250
2251 group_no = cluster / osb->bitmap_cpg;
2252 if (!group_no)
2253 return osb->first_cluster_group_blkno;
2254 return ocfs2_clusters_to_blocks(inode->i_sb,
2255 group_no * osb->bitmap_cpg);
2256 }
2257
2258 /* given the block number of a cluster start, calculate which cluster
2259 * group and descriptor bitmap offset that corresponds to. */
2260 static inline void ocfs2_block_to_cluster_group(struct inode *inode,
2261 u64 data_blkno,
2262 u64 *bg_blkno,
2263 u16 *bg_bit_off)
2264 {
2265 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2266 u32 data_cluster = ocfs2_blocks_to_clusters(osb->sb, data_blkno);
2267
2268 BUG_ON(!ocfs2_is_cluster_bitmap(inode));
2269
2270 *bg_blkno = ocfs2_which_cluster_group(inode,
2271 data_cluster);
2272
2273 if (*bg_blkno == osb->first_cluster_group_blkno)
2274 *bg_bit_off = (u16) data_cluster;
2275 else
2276 *bg_bit_off = (u16) ocfs2_blocks_to_clusters(osb->sb,
2277 data_blkno - *bg_blkno);
2278 }
2279
2280 /*
2281 * min_bits - minimum contiguous chunk from this total allocation we
2282 * can handle. set to what we asked for originally for a full
2283 * contig. allocation, set to '1' to indicate we can deal with extents
2284 * of any size.
2285 */
2286 int __ocfs2_claim_clusters(handle_t *handle,
2287 struct ocfs2_alloc_context *ac,
2288 u32 min_clusters,
2289 u32 max_clusters,
2290 u32 *cluster_start,
2291 u32 *num_clusters)
2292 {
2293 int status;
2294 unsigned int bits_wanted = max_clusters;
2295 struct ocfs2_suballoc_result res = { .sr_blkno = 0, };
2296 struct ocfs2_super *osb = OCFS2_SB(ac->ac_inode->i_sb);
2297
2298 BUG_ON(ac->ac_bits_given >= ac->ac_bits_wanted);
2299
2300 BUG_ON(ac->ac_which != OCFS2_AC_USE_LOCAL
2301 && ac->ac_which != OCFS2_AC_USE_MAIN);
2302
2303 if (ac->ac_which == OCFS2_AC_USE_LOCAL) {
2304 WARN_ON(min_clusters > 1);
2305
2306 status = ocfs2_claim_local_alloc_bits(osb,
2307 handle,
2308 ac,
2309 bits_wanted,
2310 cluster_start,
2311 num_clusters);
2312 if (!status)
2313 atomic_inc(&osb->alloc_stats.local_data);
2314 } else {
2315 if (min_clusters > (osb->bitmap_cpg - 1)) {
2316 /* The only paths asking for contiguousness
2317 * should know about this already. */
2318 mlog(ML_ERROR, "minimum allocation requested %u exceeds "
2319 "group bitmap size %u!\n", min_clusters,
2320 osb->bitmap_cpg);
2321 status = -ENOSPC;
2322 goto bail;
2323 }
2324 /* clamp the current request down to a realistic size. */
2325 if (bits_wanted > (osb->bitmap_cpg - 1))
2326 bits_wanted = osb->bitmap_cpg - 1;
2327
2328 status = ocfs2_claim_suballoc_bits(ac,
2329 handle,
2330 bits_wanted,
2331 min_clusters,
2332 &res);
2333 if (!status) {
2334 BUG_ON(res.sr_blkno); /* cluster alloc can't set */
2335 *cluster_start =
2336 ocfs2_desc_bitmap_to_cluster_off(ac->ac_inode,
2337 res.sr_bg_blkno,
2338 res.sr_bit_offset);
2339 atomic_inc(&osb->alloc_stats.bitmap_data);
2340 *num_clusters = res.sr_bits;
2341 }
2342 }
2343 if (status < 0) {
2344 if (status != -ENOSPC)
2345 mlog_errno(status);
2346 goto bail;
2347 }
2348
2349 ac->ac_bits_given += *num_clusters;
2350
2351 bail:
2352 if (status)
2353 mlog_errno(status);
2354 return status;
2355 }
2356
2357 int ocfs2_claim_clusters(handle_t *handle,
2358 struct ocfs2_alloc_context *ac,
2359 u32 min_clusters,
2360 u32 *cluster_start,
2361 u32 *num_clusters)
2362 {
2363 unsigned int bits_wanted = ac->ac_bits_wanted - ac->ac_bits_given;
2364
2365 return __ocfs2_claim_clusters(handle, ac, min_clusters,
2366 bits_wanted, cluster_start, num_clusters);
2367 }
2368
2369 static int ocfs2_block_group_clear_bits(handle_t *handle,
2370 struct inode *alloc_inode,
2371 struct ocfs2_group_desc *bg,
2372 struct buffer_head *group_bh,
2373 unsigned int bit_off,
2374 unsigned int num_bits,
2375 void (*undo_fn)(unsigned int bit,
2376 unsigned long *bmap))
2377 {
2378 int status;
2379 unsigned int tmp;
2380 struct ocfs2_group_desc *undo_bg = NULL;
2381
2382 /* The caller got this descriptor from
2383 * ocfs2_read_group_descriptor(). Any corruption is a code bug. */
2384 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
2385
2386 trace_ocfs2_block_group_clear_bits(bit_off, num_bits);
2387
2388 BUG_ON(undo_fn && !ocfs2_is_cluster_bitmap(alloc_inode));
2389 status = ocfs2_journal_access_gd(handle, INODE_CACHE(alloc_inode),
2390 group_bh,
2391 undo_fn ?
2392 OCFS2_JOURNAL_ACCESS_UNDO :
2393 OCFS2_JOURNAL_ACCESS_WRITE);
2394 if (status < 0) {
2395 mlog_errno(status);
2396 goto bail;
2397 }
2398
2399 if (undo_fn) {
2400 jbd_lock_bh_state(group_bh);
2401 undo_bg = (struct ocfs2_group_desc *)
2402 bh2jh(group_bh)->b_committed_data;
2403 BUG_ON(!undo_bg);
2404 }
2405
2406 tmp = num_bits;
2407 while(tmp--) {
2408 ocfs2_clear_bit((bit_off + tmp),
2409 (unsigned long *) bg->bg_bitmap);
2410 if (undo_fn)
2411 undo_fn(bit_off + tmp,
2412 (unsigned long *) undo_bg->bg_bitmap);
2413 }
2414 le16_add_cpu(&bg->bg_free_bits_count, num_bits);
2415 if (le16_to_cpu(bg->bg_free_bits_count) > le16_to_cpu(bg->bg_bits)) {
2416 return ocfs2_error(alloc_inode->i_sb, "Group descriptor # %llu has bit count %u but claims %u are freed. num_bits %d\n",
2417 (unsigned long long)le64_to_cpu(bg->bg_blkno),
2418 le16_to_cpu(bg->bg_bits),
2419 le16_to_cpu(bg->bg_free_bits_count),
2420 num_bits);
2421 }
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 /* The alloc_bh comes from ocfs2_free_dinode() or
2451 * ocfs2_free_clusters(). The callers have all locked the
2452 * allocator and gotten alloc_bh from the lock call. This
2453 * validates the dinode buffer. Any corruption that has happened
2454 * is a code bug. */
2455 BUG_ON(!OCFS2_IS_VALID_DINODE(fe));
2456 BUG_ON((count + start_bit) > ocfs2_bits_per_group(cl));
2457
2458 trace_ocfs2_free_suballoc_bits(
2459 (unsigned long long)OCFS2_I(alloc_inode)->ip_blkno,
2460 (unsigned long long)bg_blkno,
2461 start_bit, count);
2462
2463 status = ocfs2_read_group_descriptor(alloc_inode, fe, bg_blkno,
2464 &group_bh);
2465 if (status < 0) {
2466 mlog_errno(status);
2467 goto bail;
2468 }
2469 group = (struct ocfs2_group_desc *) group_bh->b_data;
2470
2471 BUG_ON((count + start_bit) > le16_to_cpu(group->bg_bits));
2472
2473 status = ocfs2_block_group_clear_bits(handle, alloc_inode,
2474 group, group_bh,
2475 start_bit, count, undo_fn);
2476 if (status < 0) {
2477 mlog_errno(status);
2478 goto bail;
2479 }
2480
2481 status = ocfs2_journal_access_di(handle, INODE_CACHE(alloc_inode),
2482 alloc_bh, OCFS2_JOURNAL_ACCESS_WRITE);
2483 if (status < 0) {
2484 mlog_errno(status);
2485 ocfs2_block_group_set_bits(handle, alloc_inode, group, group_bh,
2486 start_bit, count);
2487 goto bail;
2488 }
2489
2490 le32_add_cpu(&cl->cl_recs[le16_to_cpu(group->bg_chain)].c_free,
2491 count);
2492 tmp_used = le32_to_cpu(fe->id1.bitmap1.i_used);
2493 fe->id1.bitmap1.i_used = cpu_to_le32(tmp_used - count);
2494 ocfs2_journal_dirty(handle, alloc_bh);
2495
2496 bail:
2497 brelse(group_bh);
2498
2499 if (status)
2500 mlog_errno(status);
2501 return status;
2502 }
2503
2504 int ocfs2_free_suballoc_bits(handle_t *handle,
2505 struct inode *alloc_inode,
2506 struct buffer_head *alloc_bh,
2507 unsigned int start_bit,
2508 u64 bg_blkno,
2509 unsigned int count)
2510 {
2511 return _ocfs2_free_suballoc_bits(handle, alloc_inode, alloc_bh,
2512 start_bit, bg_blkno, count, NULL);
2513 }
2514
2515 int ocfs2_free_dinode(handle_t *handle,
2516 struct inode *inode_alloc_inode,
2517 struct buffer_head *inode_alloc_bh,
2518 struct ocfs2_dinode *di)
2519 {
2520 u64 blk = le64_to_cpu(di->i_blkno);
2521 u16 bit = le16_to_cpu(di->i_suballoc_bit);
2522 u64 bg_blkno = ocfs2_which_suballoc_group(blk, bit);
2523
2524 if (di->i_suballoc_loc)
2525 bg_blkno = le64_to_cpu(di->i_suballoc_loc);
2526 return ocfs2_free_suballoc_bits(handle, inode_alloc_inode,
2527 inode_alloc_bh, bit, bg_blkno, 1);
2528 }
2529
2530 static int _ocfs2_free_clusters(handle_t *handle,
2531 struct inode *bitmap_inode,
2532 struct buffer_head *bitmap_bh,
2533 u64 start_blk,
2534 unsigned int num_clusters,
2535 void (*undo_fn)(unsigned int bit,
2536 unsigned long *bitmap))
2537 {
2538 int status;
2539 u16 bg_start_bit;
2540 u64 bg_blkno;
2541 struct ocfs2_dinode *fe;
2542
2543 /* You can't ever have a contiguous set of clusters
2544 * bigger than a block group bitmap so we never have to worry
2545 * about looping on them.
2546 * This is expensive. We can safely remove once this stuff has
2547 * gotten tested really well. */
2548 BUG_ON(start_blk != ocfs2_clusters_to_blocks(bitmap_inode->i_sb, ocfs2_blocks_to_clusters(bitmap_inode->i_sb, start_blk)));
2549
2550 fe = (struct ocfs2_dinode *) bitmap_bh->b_data;
2551
2552 ocfs2_block_to_cluster_group(bitmap_inode, start_blk, &bg_blkno,
2553 &bg_start_bit);
2554
2555 trace_ocfs2_free_clusters((unsigned long long)bg_blkno,
2556 (unsigned long long)start_blk,
2557 bg_start_bit, num_clusters);
2558
2559 status = _ocfs2_free_suballoc_bits(handle, bitmap_inode, bitmap_bh,
2560 bg_start_bit, bg_blkno,
2561 num_clusters, undo_fn);
2562 if (status < 0) {
2563 mlog_errno(status);
2564 goto out;
2565 }
2566
2567 ocfs2_local_alloc_seen_free_bits(OCFS2_SB(bitmap_inode->i_sb),
2568 num_clusters);
2569
2570 out:
2571 if (status)
2572 mlog_errno(status);
2573 return status;
2574 }
2575
2576 int ocfs2_free_clusters(handle_t *handle,
2577 struct inode *bitmap_inode,
2578 struct buffer_head *bitmap_bh,
2579 u64 start_blk,
2580 unsigned int num_clusters)
2581 {
2582 return _ocfs2_free_clusters(handle, bitmap_inode, bitmap_bh,
2583 start_blk, num_clusters,
2584 _ocfs2_set_bit);
2585 }
2586
2587 /*
2588 * Give never-used clusters back to the global bitmap. We don't need
2589 * to protect these bits in the undo buffer.
2590 */
2591 int ocfs2_release_clusters(handle_t *handle,
2592 struct inode *bitmap_inode,
2593 struct buffer_head *bitmap_bh,
2594 u64 start_blk,
2595 unsigned int num_clusters)
2596 {
2597 return _ocfs2_free_clusters(handle, bitmap_inode, bitmap_bh,
2598 start_blk, num_clusters,
2599 _ocfs2_clear_bit);
2600 }
2601
2602 static inline void ocfs2_debug_bg(struct ocfs2_group_desc *bg)
2603 {
2604 printk("Block Group:\n");
2605 printk("bg_signature: %s\n", bg->bg_signature);
2606 printk("bg_size: %u\n", bg->bg_size);
2607 printk("bg_bits: %u\n", bg->bg_bits);
2608 printk("bg_free_bits_count: %u\n", bg->bg_free_bits_count);
2609 printk("bg_chain: %u\n", bg->bg_chain);
2610 printk("bg_generation: %u\n", le32_to_cpu(bg->bg_generation));
2611 printk("bg_next_group: %llu\n",
2612 (unsigned long long)bg->bg_next_group);
2613 printk("bg_parent_dinode: %llu\n",
2614 (unsigned long long)bg->bg_parent_dinode);
2615 printk("bg_blkno: %llu\n",
2616 (unsigned long long)bg->bg_blkno);
2617 }
2618
2619 static inline void ocfs2_debug_suballoc_inode(struct ocfs2_dinode *fe)
2620 {
2621 int i;
2622
2623 printk("Suballoc Inode %llu:\n", (unsigned long long)fe->i_blkno);
2624 printk("i_signature: %s\n", fe->i_signature);
2625 printk("i_size: %llu\n",
2626 (unsigned long long)fe->i_size);
2627 printk("i_clusters: %u\n", fe->i_clusters);
2628 printk("i_generation: %u\n",
2629 le32_to_cpu(fe->i_generation));
2630 printk("id1.bitmap1.i_used: %u\n",
2631 le32_to_cpu(fe->id1.bitmap1.i_used));
2632 printk("id1.bitmap1.i_total: %u\n",
2633 le32_to_cpu(fe->id1.bitmap1.i_total));
2634 printk("id2.i_chain.cl_cpg: %u\n", fe->id2.i_chain.cl_cpg);
2635 printk("id2.i_chain.cl_bpc: %u\n", fe->id2.i_chain.cl_bpc);
2636 printk("id2.i_chain.cl_count: %u\n", fe->id2.i_chain.cl_count);
2637 printk("id2.i_chain.cl_next_free_rec: %u\n",
2638 fe->id2.i_chain.cl_next_free_rec);
2639 for(i = 0; i < fe->id2.i_chain.cl_next_free_rec; i++) {
2640 printk("fe->id2.i_chain.cl_recs[%d].c_free: %u\n", i,
2641 fe->id2.i_chain.cl_recs[i].c_free);
2642 printk("fe->id2.i_chain.cl_recs[%d].c_total: %u\n", i,
2643 fe->id2.i_chain.cl_recs[i].c_total);
2644 printk("fe->id2.i_chain.cl_recs[%d].c_blkno: %llu\n", i,
2645 (unsigned long long)fe->id2.i_chain.cl_recs[i].c_blkno);
2646 }
2647 }
2648
2649 /*
2650 * For a given allocation, determine which allocators will need to be
2651 * accessed, and lock them, reserving the appropriate number of bits.
2652 *
2653 * Sparse file systems call this from ocfs2_write_begin_nolock()
2654 * and ocfs2_allocate_unwritten_extents().
2655 *
2656 * File systems which don't support holes call this from
2657 * ocfs2_extend_allocation().
2658 */
2659 int ocfs2_lock_allocators(struct inode *inode,
2660 struct ocfs2_extent_tree *et,
2661 u32 clusters_to_add, u32 extents_to_split,
2662 struct ocfs2_alloc_context **data_ac,
2663 struct ocfs2_alloc_context **meta_ac)
2664 {
2665 int ret = 0, num_free_extents;
2666 unsigned int max_recs_needed = clusters_to_add + 2 * extents_to_split;
2667 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2668
2669 *meta_ac = NULL;
2670 if (data_ac)
2671 *data_ac = NULL;
2672
2673 BUG_ON(clusters_to_add != 0 && data_ac == NULL);
2674
2675 num_free_extents = ocfs2_num_free_extents(osb, et);
2676 if (num_free_extents < 0) {
2677 ret = num_free_extents;
2678 mlog_errno(ret);
2679 goto out;
2680 }
2681
2682 /*
2683 * Sparse allocation file systems need to be more conservative
2684 * with reserving room for expansion - the actual allocation
2685 * happens while we've got a journal handle open so re-taking
2686 * a cluster lock (because we ran out of room for another
2687 * extent) will violate ordering rules.
2688 *
2689 * Most of the time we'll only be seeing this 1 cluster at a time
2690 * anyway.
2691 *
2692 * Always lock for any unwritten extents - we might want to
2693 * add blocks during a split.
2694 */
2695 if (!num_free_extents ||
2696 (ocfs2_sparse_alloc(osb) && num_free_extents < max_recs_needed)) {
2697 ret = ocfs2_reserve_new_metadata(osb, et->et_root_el, meta_ac);
2698 if (ret < 0) {
2699 if (ret != -ENOSPC)
2700 mlog_errno(ret);
2701 goto out;
2702 }
2703 }
2704
2705 if (clusters_to_add == 0)
2706 goto out;
2707
2708 ret = ocfs2_reserve_clusters(osb, clusters_to_add, data_ac);
2709 if (ret < 0) {
2710 if (ret != -ENOSPC)
2711 mlog_errno(ret);
2712 goto out;
2713 }
2714
2715 out:
2716 if (ret) {
2717 if (*meta_ac) {
2718 ocfs2_free_alloc_context(*meta_ac);
2719 *meta_ac = NULL;
2720 }
2721
2722 /*
2723 * We cannot have an error and a non null *data_ac.
2724 */
2725 }
2726
2727 return ret;
2728 }
2729
2730 /*
2731 * Read the inode specified by blkno to get suballoc_slot and
2732 * suballoc_bit.
2733 */
2734 static int ocfs2_get_suballoc_slot_bit(struct ocfs2_super *osb, u64 blkno,
2735 u16 *suballoc_slot, u64 *group_blkno,
2736 u16 *suballoc_bit)
2737 {
2738 int status;
2739 struct buffer_head *inode_bh = NULL;
2740 struct ocfs2_dinode *inode_fe;
2741
2742 trace_ocfs2_get_suballoc_slot_bit((unsigned long long)blkno);
2743
2744 /* dirty read disk */
2745 status = ocfs2_read_blocks_sync(osb, blkno, 1, &inode_bh);
2746 if (status < 0) {
2747 mlog(ML_ERROR, "read block %llu failed %d\n",
2748 (unsigned long long)blkno, status);
2749 goto bail;
2750 }
2751
2752 inode_fe = (struct ocfs2_dinode *) inode_bh->b_data;
2753 if (!OCFS2_IS_VALID_DINODE(inode_fe)) {
2754 mlog(ML_ERROR, "invalid inode %llu requested\n",
2755 (unsigned long long)blkno);
2756 status = -EINVAL;
2757 goto bail;
2758 }
2759
2760 if (le16_to_cpu(inode_fe->i_suballoc_slot) != (u16)OCFS2_INVALID_SLOT &&
2761 (u32)le16_to_cpu(inode_fe->i_suballoc_slot) > osb->max_slots - 1) {
2762 mlog(ML_ERROR, "inode %llu has invalid suballoc slot %u\n",
2763 (unsigned long long)blkno,
2764 (u32)le16_to_cpu(inode_fe->i_suballoc_slot));
2765 status = -EINVAL;
2766 goto bail;
2767 }
2768
2769 if (suballoc_slot)
2770 *suballoc_slot = le16_to_cpu(inode_fe->i_suballoc_slot);
2771 if (suballoc_bit)
2772 *suballoc_bit = le16_to_cpu(inode_fe->i_suballoc_bit);
2773 if (group_blkno)
2774 *group_blkno = le64_to_cpu(inode_fe->i_suballoc_loc);
2775
2776 bail:
2777 brelse(inode_bh);
2778
2779 if (status)
2780 mlog_errno(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 trace_ocfs2_test_suballoc_bit((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 if (status)
2832 mlog_errno(status);
2833 return status;
2834 }
2835
2836 /*
2837 * Test if the bit representing this inode (blkno) is set in the
2838 * suballocator.
2839 *
2840 * On success, 0 is returned and *res is 1 for SET; 0 otherwise.
2841 *
2842 * In the event of failure, a negative value is returned and *res is
2843 * meaningless.
2844 *
2845 * Callers must make sure to hold nfs_sync_lock to prevent
2846 * ocfs2_delete_inode() on another node from accessing the same
2847 * suballocator concurrently.
2848 */
2849 int ocfs2_test_inode_bit(struct ocfs2_super *osb, u64 blkno, int *res)
2850 {
2851 int status;
2852 u64 group_blkno = 0;
2853 u16 suballoc_bit = 0, suballoc_slot = 0;
2854 struct inode *inode_alloc_inode;
2855 struct buffer_head *alloc_bh = NULL;
2856
2857 trace_ocfs2_test_inode_bit((unsigned long long)blkno);
2858
2859 status = ocfs2_get_suballoc_slot_bit(osb, blkno, &suballoc_slot,
2860 &group_blkno, &suballoc_bit);
2861 if (status < 0) {
2862 mlog(ML_ERROR, "get alloc slot and bit failed %d\n", status);
2863 goto bail;
2864 }
2865
2866 inode_alloc_inode =
2867 ocfs2_get_system_file_inode(osb, INODE_ALLOC_SYSTEM_INODE,
2868 suballoc_slot);
2869 if (!inode_alloc_inode) {
2870 /* the error code could be inaccurate, but we are not able to
2871 * get the correct one. */
2872 status = -EINVAL;
2873 mlog(ML_ERROR, "unable to get alloc inode in slot %u\n",
2874 (u32)suballoc_slot);
2875 goto bail;
2876 }
2877
2878 mutex_lock(&inode_alloc_inode->i_mutex);
2879 status = ocfs2_inode_lock(inode_alloc_inode, &alloc_bh, 0);
2880 if (status < 0) {
2881 mutex_unlock(&inode_alloc_inode->i_mutex);
2882 iput(inode_alloc_inode);
2883 mlog(ML_ERROR, "lock on alloc inode on slot %u failed %d\n",
2884 (u32)suballoc_slot, status);
2885 goto bail;
2886 }
2887
2888 status = ocfs2_test_suballoc_bit(osb, inode_alloc_inode, alloc_bh,
2889 group_blkno, blkno, suballoc_bit, res);
2890 if (status < 0)
2891 mlog(ML_ERROR, "test suballoc bit failed %d\n", status);
2892
2893 ocfs2_inode_unlock(inode_alloc_inode, 0);
2894 mutex_unlock(&inode_alloc_inode->i_mutex);
2895
2896 iput(inode_alloc_inode);
2897 brelse(alloc_bh);
2898 bail:
2899 if (status)
2900 mlog_errno(status);
2901 return status;
2902 }
Linux with added FPC-III support