1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* -*- mode: c; c-basic-offset: 8; -*-
3 * vim: noexpandtab sw=8 ts=8 sts=0:
4 *
5 * suballoc.c
6 *
7 * metadata alloc and free
8 * Inspired by ext3 block groups.
9 *
10 * Copyright (C) 2002, 2004 Oracle. All rights reserved.
11 */
12
13 #include <linux/fs.h>
14 #include <linux/types.h>
15 #include <linux/slab.h>
16 #include <linux/highmem.h>
17
18 #include <cluster/masklog.h>
19
20 #include "ocfs2.h"
21
22 #include "alloc.h"
23 #include "blockcheck.h"
24 #include "dlmglue.h"
25 #include "inode.h"
26 #include "journal.h"
27 #include "localalloc.h"
28 #include "suballoc.h"
29 #include "super.h"
30 #include "sysfile.h"
31 #include "uptodate.h"
32 #include "ocfs2_trace.h"
33
34 #include "buffer_head_io.h"
35
36 #define NOT_ALLOC_NEW_GROUP 0
37 #define ALLOC_NEW_GROUP 0x1
38 #define ALLOC_GROUPS_FROM_GLOBAL 0x2
39
40 #define OCFS2_MAX_TO_STEAL 1024
41
42 struct ocfs2_suballoc_result {
43 u64 sr_bg_blkno; /* The bg we allocated from. Set
44 to 0 when a block group is
45 contiguous. */
46 u64 sr_bg_stable_blkno; /*
47 * Doesn't change, always
48 * set to target block
49 * group descriptor
50 * block.
51 */
52 u64 sr_blkno; /* The first allocated block */
53 unsigned int sr_bit_offset; /* The bit in the bg */
54 unsigned int sr_bits; /* How many bits we claimed */
55 };
56
ocfs2_group_from_res(struct ocfs2_suballoc_result * res)57 static u64 ocfs2_group_from_res(struct ocfs2_suballoc_result *res)
58 {
59 if (res->sr_blkno == 0)
60 return 0;
61
62 if (res->sr_bg_blkno)
63 return res->sr_bg_blkno;
64
65 return ocfs2_which_suballoc_group(res->sr_blkno, res->sr_bit_offset);
66 }
67
68 static inline u16 ocfs2_find_victim_chain(struct ocfs2_chain_list *cl);
69 static int ocfs2_block_group_fill(handle_t *handle,
70 struct inode *alloc_inode,
71 struct buffer_head *bg_bh,
72 u64 group_blkno,
73 unsigned int group_clusters,
74 u16 my_chain,
75 struct ocfs2_chain_list *cl);
76 static int ocfs2_block_group_alloc(struct ocfs2_super *osb,
77 struct inode *alloc_inode,
78 struct buffer_head *bh,
79 u64 max_block,
80 u64 *last_alloc_group,
81 int flags);
82
83 static int ocfs2_cluster_group_search(struct inode *inode,
84 struct buffer_head *group_bh,
85 u32 bits_wanted, u32 min_bits,
86 u64 max_block,
87 struct ocfs2_suballoc_result *res);
88 static int ocfs2_block_group_search(struct inode *inode,
89 struct buffer_head *group_bh,
90 u32 bits_wanted, u32 min_bits,
91 u64 max_block,
92 struct ocfs2_suballoc_result *res);
93 static int ocfs2_claim_suballoc_bits(struct ocfs2_alloc_context *ac,
94 handle_t *handle,
95 u32 bits_wanted,
96 u32 min_bits,
97 struct ocfs2_suballoc_result *res);
98 static int ocfs2_test_bg_bit_allocatable(struct buffer_head *bg_bh,
99 int nr);
100 static int ocfs2_relink_block_group(handle_t *handle,
101 struct inode *alloc_inode,
102 struct buffer_head *fe_bh,
103 struct buffer_head *bg_bh,
104 struct buffer_head *prev_bg_bh,
105 u16 chain);
106 static inline int ocfs2_block_group_reasonably_empty(struct ocfs2_group_desc *bg,
107 u32 wanted);
108 static inline u32 ocfs2_desc_bitmap_to_cluster_off(struct inode *inode,
109 u64 bg_blkno,
110 u16 bg_bit_off);
111 static inline void ocfs2_block_to_cluster_group(struct inode *inode,
112 u64 data_blkno,
113 u64 *bg_blkno,
114 u16 *bg_bit_off);
115 static int ocfs2_reserve_clusters_with_limit(struct ocfs2_super *osb,
116 u32 bits_wanted, u64 max_block,
117 int flags,
118 struct ocfs2_alloc_context **ac);
119
ocfs2_free_ac_resource(struct ocfs2_alloc_context * ac)120 void ocfs2_free_ac_resource(struct ocfs2_alloc_context *ac)
121 {
122 struct inode *inode = ac->ac_inode;
123
124 if (inode) {
125 if (ac->ac_which != OCFS2_AC_USE_LOCAL)
126 ocfs2_inode_unlock(inode, 1);
127
128 inode_unlock(inode);
129
130 iput(inode);
131 ac->ac_inode = NULL;
132 }
133 brelse(ac->ac_bh);
134 ac->ac_bh = NULL;
135 ac->ac_resv = NULL;
136 kfree(ac->ac_find_loc_priv);
137 ac->ac_find_loc_priv = NULL;
138 }
139
ocfs2_free_alloc_context(struct ocfs2_alloc_context * ac)140 void ocfs2_free_alloc_context(struct ocfs2_alloc_context *ac)
141 {
142 ocfs2_free_ac_resource(ac);
143 kfree(ac);
144 }
145
ocfs2_bits_per_group(struct ocfs2_chain_list * cl)146 static u32 ocfs2_bits_per_group(struct ocfs2_chain_list *cl)
147 {
148 return (u32)le16_to_cpu(cl->cl_cpg) * (u32)le16_to_cpu(cl->cl_bpc);
149 }
150
151 #define do_error(fmt, ...) \
152 do { \
153 if (resize) \
154 mlog(ML_ERROR, fmt, ##__VA_ARGS__); \
155 else \
156 return ocfs2_error(sb, fmt, ##__VA_ARGS__); \
157 } while (0)
158
ocfs2_validate_gd_self(struct super_block * sb,struct buffer_head * bh,int resize)159 static int ocfs2_validate_gd_self(struct super_block *sb,
160 struct buffer_head *bh,
161 int resize)
162 {
163 struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data;
164
165 if (!OCFS2_IS_VALID_GROUP_DESC(gd)) {
166 do_error("Group descriptor #%llu has bad signature %.*s\n",
167 (unsigned long long)bh->b_blocknr, 7,
168 gd->bg_signature);
169 }
170
171 if (le64_to_cpu(gd->bg_blkno) != bh->b_blocknr) {
172 do_error("Group descriptor #%llu has an invalid bg_blkno of %llu\n",
173 (unsigned long long)bh->b_blocknr,
174 (unsigned long long)le64_to_cpu(gd->bg_blkno));
175 }
176
177 if (le32_to_cpu(gd->bg_generation) != OCFS2_SB(sb)->fs_generation) {
178 do_error("Group descriptor #%llu has an invalid fs_generation of #%u\n",
179 (unsigned long long)bh->b_blocknr,
180 le32_to_cpu(gd->bg_generation));
181 }
182
183 if (le16_to_cpu(gd->bg_free_bits_count) > le16_to_cpu(gd->bg_bits)) {
184 do_error("Group descriptor #%llu has bit count %u but claims that %u are free\n",
185 (unsigned long long)bh->b_blocknr,
186 le16_to_cpu(gd->bg_bits),
187 le16_to_cpu(gd->bg_free_bits_count));
188 }
189
190 if (le16_to_cpu(gd->bg_bits) > (8 * le16_to_cpu(gd->bg_size))) {
191 do_error("Group descriptor #%llu has bit count %u but max bitmap bits of %u\n",
192 (unsigned long long)bh->b_blocknr,
193 le16_to_cpu(gd->bg_bits),
194 8 * le16_to_cpu(gd->bg_size));
195 }
196
197 return 0;
198 }
199
ocfs2_validate_gd_parent(struct super_block * sb,struct ocfs2_dinode * di,struct buffer_head * bh,int resize)200 static int ocfs2_validate_gd_parent(struct super_block *sb,
201 struct ocfs2_dinode *di,
202 struct buffer_head *bh,
203 int resize)
204 {
205 unsigned int max_bits;
206 struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data;
207
208 if (di->i_blkno != gd->bg_parent_dinode) {
209 do_error("Group descriptor #%llu has bad parent pointer (%llu, expected %llu)\n",
210 (unsigned long long)bh->b_blocknr,
211 (unsigned long long)le64_to_cpu(gd->bg_parent_dinode),
212 (unsigned long long)le64_to_cpu(di->i_blkno));
213 }
214
215 max_bits = le16_to_cpu(di->id2.i_chain.cl_cpg) * le16_to_cpu(di->id2.i_chain.cl_bpc);
216 if (le16_to_cpu(gd->bg_bits) > max_bits) {
217 do_error("Group descriptor #%llu has bit count of %u\n",
218 (unsigned long long)bh->b_blocknr,
219 le16_to_cpu(gd->bg_bits));
220 }
221
222 /* In resize, we may meet the case bg_chain == cl_next_free_rec. */
223 if ((le16_to_cpu(gd->bg_chain) >
224 le16_to_cpu(di->id2.i_chain.cl_next_free_rec)) ||
225 ((le16_to_cpu(gd->bg_chain) ==
226 le16_to_cpu(di->id2.i_chain.cl_next_free_rec)) && !resize)) {
227 do_error("Group descriptor #%llu has bad chain %u\n",
228 (unsigned long long)bh->b_blocknr,
229 le16_to_cpu(gd->bg_chain));
230 }
231
232 return 0;
233 }
234
235 #undef do_error
236
237 /*
238 * This version only prints errors. It does not fail the filesystem, and
239 * exists only for resize.
240 */
ocfs2_check_group_descriptor(struct super_block * sb,struct ocfs2_dinode * di,struct buffer_head * bh)241 int ocfs2_check_group_descriptor(struct super_block *sb,
242 struct ocfs2_dinode *di,
243 struct buffer_head *bh)
244 {
245 int rc;
246 struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data;
247
248 BUG_ON(!buffer_uptodate(bh));
249
250 /*
251 * If the ecc fails, we return the error but otherwise
252 * leave the filesystem running. We know any error is
253 * local to this block.
254 */
255 rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &gd->bg_check);
256 if (rc) {
257 mlog(ML_ERROR,
258 "Checksum failed for group descriptor %llu\n",
259 (unsigned long long)bh->b_blocknr);
260 } else
261 rc = ocfs2_validate_gd_self(sb, bh, 1);
262 if (!rc)
263 rc = ocfs2_validate_gd_parent(sb, di, bh, 1);
264
265 return rc;
266 }
267
ocfs2_validate_group_descriptor(struct super_block * sb,struct buffer_head * bh)268 static int ocfs2_validate_group_descriptor(struct super_block *sb,
269 struct buffer_head *bh)
270 {
271 int rc;
272 struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data;
273
274 trace_ocfs2_validate_group_descriptor(
275 (unsigned long long)bh->b_blocknr);
276
277 BUG_ON(!buffer_uptodate(bh));
278
279 /*
280 * If the ecc fails, we return the error but otherwise
281 * leave the filesystem running. We know any error is
282 * local to this block.
283 */
284 rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &gd->bg_check);
285 if (rc)
286 return rc;
287
288 /*
289 * Errors after here are fatal.
290 */
291
292 return ocfs2_validate_gd_self(sb, bh, 0);
293 }
294
ocfs2_read_group_descriptor(struct inode * inode,struct ocfs2_dinode * di,u64 gd_blkno,struct buffer_head ** bh)295 int ocfs2_read_group_descriptor(struct inode *inode, struct ocfs2_dinode *di,
296 u64 gd_blkno, struct buffer_head **bh)
297 {
298 int rc;
299 struct buffer_head *tmp = *bh;
300
301 rc = ocfs2_read_block(INODE_CACHE(inode), gd_blkno, &tmp,
302 ocfs2_validate_group_descriptor);
303 if (rc)
304 goto out;
305
306 rc = ocfs2_validate_gd_parent(inode->i_sb, di, tmp, 0);
307 if (rc) {
308 brelse(tmp);
309 goto out;
310 }
311
312 /* If ocfs2_read_block() got us a new bh, pass it up. */
313 if (!*bh)
314 *bh = tmp;
315
316 out:
317 return rc;
318 }
319
ocfs2_bg_discontig_add_extent(struct ocfs2_super * osb,struct ocfs2_group_desc * bg,struct ocfs2_chain_list * cl,u64 p_blkno,unsigned int clusters)320 static void ocfs2_bg_discontig_add_extent(struct ocfs2_super *osb,
321 struct ocfs2_group_desc *bg,
322 struct ocfs2_chain_list *cl,
323 u64 p_blkno, unsigned int clusters)
324 {
325 struct ocfs2_extent_list *el = &bg->bg_list;
326 struct ocfs2_extent_rec *rec;
327
328 BUG_ON(!ocfs2_supports_discontig_bg(osb));
329 if (!el->l_next_free_rec)
330 el->l_count = cpu_to_le16(ocfs2_extent_recs_per_gd(osb->sb));
331 rec = &el->l_recs[le16_to_cpu(el->l_next_free_rec)];
332 rec->e_blkno = cpu_to_le64(p_blkno);
333 rec->e_cpos = cpu_to_le32(le16_to_cpu(bg->bg_bits) /
334 le16_to_cpu(cl->cl_bpc));
335 rec->e_leaf_clusters = cpu_to_le16(clusters);
336 le16_add_cpu(&bg->bg_bits, clusters * le16_to_cpu(cl->cl_bpc));
337 le16_add_cpu(&bg->bg_free_bits_count,
338 clusters * le16_to_cpu(cl->cl_bpc));
339 le16_add_cpu(&el->l_next_free_rec, 1);
340 }
341
ocfs2_block_group_fill(handle_t * handle,struct inode * alloc_inode,struct buffer_head * bg_bh,u64 group_blkno,unsigned int group_clusters,u16 my_chain,struct ocfs2_chain_list * cl)342 static int ocfs2_block_group_fill(handle_t *handle,
343 struct inode *alloc_inode,
344 struct buffer_head *bg_bh,
345 u64 group_blkno,
346 unsigned int group_clusters,
347 u16 my_chain,
348 struct ocfs2_chain_list *cl)
349 {
350 int status = 0;
351 struct ocfs2_super *osb = OCFS2_SB(alloc_inode->i_sb);
352 struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data;
353 struct super_block * sb = alloc_inode->i_sb;
354
355 if (((unsigned long long) bg_bh->b_blocknr) != group_blkno) {
356 status = ocfs2_error(alloc_inode->i_sb,
357 "group block (%llu) != b_blocknr (%llu)\n",
358 (unsigned long long)group_blkno,
359 (unsigned long long) bg_bh->b_blocknr);
360 goto bail;
361 }
362
363 status = ocfs2_journal_access_gd(handle,
364 INODE_CACHE(alloc_inode),
365 bg_bh,
366 OCFS2_JOURNAL_ACCESS_CREATE);
367 if (status < 0) {
368 mlog_errno(status);
369 goto bail;
370 }
371
372 memset(bg, 0, sb->s_blocksize);
373 strcpy(bg->bg_signature, OCFS2_GROUP_DESC_SIGNATURE);
374 bg->bg_generation = cpu_to_le32(osb->fs_generation);
375 bg->bg_size = cpu_to_le16(ocfs2_group_bitmap_size(sb, 1,
376 osb->s_feature_incompat));
377 bg->bg_chain = cpu_to_le16(my_chain);
378 bg->bg_next_group = cl->cl_recs[my_chain].c_blkno;
379 bg->bg_parent_dinode = cpu_to_le64(OCFS2_I(alloc_inode)->ip_blkno);
380 bg->bg_blkno = cpu_to_le64(group_blkno);
381 if (group_clusters == le16_to_cpu(cl->cl_cpg))
382 bg->bg_bits = cpu_to_le16(ocfs2_bits_per_group(cl));
383 else
384 ocfs2_bg_discontig_add_extent(osb, bg, cl, group_blkno,
385 group_clusters);
386
387 /* set the 1st bit in the bitmap to account for the descriptor block */
388 ocfs2_set_bit(0, (unsigned long *)bg->bg_bitmap);
389 bg->bg_free_bits_count = cpu_to_le16(le16_to_cpu(bg->bg_bits) - 1);
390
391 ocfs2_journal_dirty(handle, bg_bh);
392
393 /* There is no need to zero out or otherwise initialize the
394 * other blocks in a group - All valid FS metadata in a block
395 * group stores the superblock fs_generation value at
396 * allocation time. */
397
398 bail:
399 if (status)
400 mlog_errno(status);
401 return status;
402 }
403
ocfs2_find_smallest_chain(struct ocfs2_chain_list * cl)404 static inline u16 ocfs2_find_smallest_chain(struct ocfs2_chain_list *cl)
405 {
406 u16 curr, best;
407
408 best = curr = 0;
409 while (curr < le16_to_cpu(cl->cl_count)) {
410 if (le32_to_cpu(cl->cl_recs[best].c_total) >
411 le32_to_cpu(cl->cl_recs[curr].c_total))
412 best = curr;
413 curr++;
414 }
415 return best;
416 }
417
418 static struct buffer_head *
ocfs2_block_group_alloc_contig(struct ocfs2_super * osb,handle_t * handle,struct inode * alloc_inode,struct ocfs2_alloc_context * ac,struct ocfs2_chain_list * cl)419 ocfs2_block_group_alloc_contig(struct ocfs2_super *osb, handle_t *handle,
420 struct inode *alloc_inode,
421 struct ocfs2_alloc_context *ac,
422 struct ocfs2_chain_list *cl)
423 {
424 int status;
425 u32 bit_off, num_bits;
426 u64 bg_blkno;
427 struct buffer_head *bg_bh;
428 unsigned int alloc_rec = ocfs2_find_smallest_chain(cl);
429
430 status = ocfs2_claim_clusters(handle, ac,
431 le16_to_cpu(cl->cl_cpg), &bit_off,
432 &num_bits);
433 if (status < 0) {
434 if (status != -ENOSPC)
435 mlog_errno(status);
436 goto bail;
437 }
438
439 /* setup the group */
440 bg_blkno = ocfs2_clusters_to_blocks(osb->sb, bit_off);
441 trace_ocfs2_block_group_alloc_contig(
442 (unsigned long long)bg_blkno, alloc_rec);
443
444 bg_bh = sb_getblk(osb->sb, bg_blkno);
445 if (!bg_bh) {
446 status = -ENOMEM;
447 mlog_errno(status);
448 goto bail;
449 }
450 ocfs2_set_new_buffer_uptodate(INODE_CACHE(alloc_inode), bg_bh);
451
452 status = ocfs2_block_group_fill(handle, alloc_inode, bg_bh,
453 bg_blkno, num_bits, alloc_rec, cl);
454 if (status < 0) {
455 brelse(bg_bh);
456 mlog_errno(status);
457 }
458
459 bail:
460 return status ? ERR_PTR(status) : bg_bh;
461 }
462
ocfs2_block_group_claim_bits(struct ocfs2_super * osb,handle_t * handle,struct ocfs2_alloc_context * ac,unsigned int min_bits,u32 * bit_off,u32 * num_bits)463 static int ocfs2_block_group_claim_bits(struct ocfs2_super *osb,
464 handle_t *handle,
465 struct ocfs2_alloc_context *ac,
466 unsigned int min_bits,
467 u32 *bit_off, u32 *num_bits)
468 {
469 int status = 0;
470
471 while (min_bits) {
472 status = ocfs2_claim_clusters(handle, ac, min_bits,
473 bit_off, num_bits);
474 if (status != -ENOSPC)
475 break;
476
477 min_bits >>= 1;
478 }
479
480 return status;
481 }
482
ocfs2_block_group_grow_discontig(handle_t * handle,struct inode * alloc_inode,struct buffer_head * bg_bh,struct ocfs2_alloc_context * ac,struct ocfs2_chain_list * cl,unsigned int min_bits)483 static int ocfs2_block_group_grow_discontig(handle_t *handle,
484 struct inode *alloc_inode,
485 struct buffer_head *bg_bh,
486 struct ocfs2_alloc_context *ac,
487 struct ocfs2_chain_list *cl,
488 unsigned int min_bits)
489 {
490 int status;
491 struct ocfs2_super *osb = OCFS2_SB(alloc_inode->i_sb);
492 struct ocfs2_group_desc *bg =
493 (struct ocfs2_group_desc *)bg_bh->b_data;
494 unsigned int needed = le16_to_cpu(cl->cl_cpg) -
495 le16_to_cpu(bg->bg_bits) / le16_to_cpu(cl->cl_bpc);
496 u32 p_cpos, clusters;
497 u64 p_blkno;
498 struct ocfs2_extent_list *el = &bg->bg_list;
499
500 status = ocfs2_journal_access_gd(handle,
501 INODE_CACHE(alloc_inode),
502 bg_bh,
503 OCFS2_JOURNAL_ACCESS_CREATE);
504 if (status < 0) {
505 mlog_errno(status);
506 goto bail;
507 }
508
509 while ((needed > 0) && (le16_to_cpu(el->l_next_free_rec) <
510 le16_to_cpu(el->l_count))) {
511 if (min_bits > needed)
512 min_bits = needed;
513 status = ocfs2_block_group_claim_bits(osb, handle, ac,
514 min_bits, &p_cpos,
515 &clusters);
516 if (status < 0) {
517 if (status != -ENOSPC)
518 mlog_errno(status);
519 goto bail;
520 }
521 p_blkno = ocfs2_clusters_to_blocks(osb->sb, p_cpos);
522 ocfs2_bg_discontig_add_extent(osb, bg, cl, p_blkno,
523 clusters);
524
525 min_bits = clusters;
526 needed = le16_to_cpu(cl->cl_cpg) -
527 le16_to_cpu(bg->bg_bits) / le16_to_cpu(cl->cl_bpc);
528 }
529
530 if (needed > 0) {
531 /*
532 * We have used up all the extent rec but can't fill up
533 * the cpg. So bail out.
534 */
535 status = -ENOSPC;
536 goto bail;
537 }
538
539 ocfs2_journal_dirty(handle, bg_bh);
540
541 bail:
542 return status;
543 }
544
ocfs2_bg_alloc_cleanup(handle_t * handle,struct ocfs2_alloc_context * cluster_ac,struct inode * alloc_inode,struct buffer_head * bg_bh)545 static void ocfs2_bg_alloc_cleanup(handle_t *handle,
546 struct ocfs2_alloc_context *cluster_ac,
547 struct inode *alloc_inode,
548 struct buffer_head *bg_bh)
549 {
550 int i, ret;
551 struct ocfs2_group_desc *bg;
552 struct ocfs2_extent_list *el;
553 struct ocfs2_extent_rec *rec;
554
555 if (!bg_bh)
556 return;
557
558 bg = (struct ocfs2_group_desc *)bg_bh->b_data;
559 el = &bg->bg_list;
560 for (i = 0; i < le16_to_cpu(el->l_next_free_rec); i++) {
561 rec = &el->l_recs[i];
562 ret = ocfs2_free_clusters(handle, cluster_ac->ac_inode,
563 cluster_ac->ac_bh,
564 le64_to_cpu(rec->e_blkno),
565 le16_to_cpu(rec->e_leaf_clusters));
566 if (ret)
567 mlog_errno(ret);
568 /* Try all the clusters to free */
569 }
570
571 ocfs2_remove_from_cache(INODE_CACHE(alloc_inode), bg_bh);
572 brelse(bg_bh);
573 }
574
575 static struct buffer_head *
ocfs2_block_group_alloc_discontig(handle_t * handle,struct inode * alloc_inode,struct ocfs2_alloc_context * ac,struct ocfs2_chain_list * cl)576 ocfs2_block_group_alloc_discontig(handle_t *handle,
577 struct inode *alloc_inode,
578 struct ocfs2_alloc_context *ac,
579 struct ocfs2_chain_list *cl)
580 {
581 int status;
582 u32 bit_off, num_bits;
583 u64 bg_blkno;
584 unsigned int min_bits = le16_to_cpu(cl->cl_cpg) >> 1;
585 struct buffer_head *bg_bh = NULL;
586 unsigned int alloc_rec = ocfs2_find_smallest_chain(cl);
587 struct ocfs2_super *osb = OCFS2_SB(alloc_inode->i_sb);
588
589 if (!ocfs2_supports_discontig_bg(osb)) {
590 status = -ENOSPC;
591 goto bail;
592 }
593
594 status = ocfs2_extend_trans(handle,
595 ocfs2_calc_bg_discontig_credits(osb->sb));
596 if (status) {
597 mlog_errno(status);
598 goto bail;
599 }
600
601 /*
602 * We're going to be grabbing from multiple cluster groups.
603 * We don't have enough credits to relink them all, and the
604 * cluster groups will be staying in cache for the duration of
605 * this operation.
606 */
607 ac->ac_disable_chain_relink = 1;
608
609 /* Claim the first region */
610 status = ocfs2_block_group_claim_bits(osb, handle, ac, min_bits,
611 &bit_off, &num_bits);
612 if (status < 0) {
613 if (status != -ENOSPC)
614 mlog_errno(status);
615 goto bail;
616 }
617 min_bits = num_bits;
618
619 /* setup the group */
620 bg_blkno = ocfs2_clusters_to_blocks(osb->sb, bit_off);
621 trace_ocfs2_block_group_alloc_discontig(
622 (unsigned long long)bg_blkno, alloc_rec);
623
624 bg_bh = sb_getblk(osb->sb, bg_blkno);
625 if (!bg_bh) {
626 status = -ENOMEM;
627 mlog_errno(status);
628 goto bail;
629 }
630 ocfs2_set_new_buffer_uptodate(INODE_CACHE(alloc_inode), bg_bh);
631
632 status = ocfs2_block_group_fill(handle, alloc_inode, bg_bh,
633 bg_blkno, num_bits, alloc_rec, cl);
634 if (status < 0) {
635 mlog_errno(status);
636 goto bail;
637 }
638
639 status = ocfs2_block_group_grow_discontig(handle, alloc_inode,
640 bg_bh, ac, cl, min_bits);
641 if (status)
642 mlog_errno(status);
643
644 bail:
645 if (status)
646 ocfs2_bg_alloc_cleanup(handle, ac, alloc_inode, bg_bh);
647 return status ? ERR_PTR(status) : bg_bh;
648 }
649
650 /*
651 * We expect the block group allocator to already be locked.
652 */
ocfs2_block_group_alloc(struct ocfs2_super * osb,struct inode * alloc_inode,struct buffer_head * bh,u64 max_block,u64 * last_alloc_group,int flags)653 static int ocfs2_block_group_alloc(struct ocfs2_super *osb,
654 struct inode *alloc_inode,
655 struct buffer_head *bh,
656 u64 max_block,
657 u64 *last_alloc_group,
658 int flags)
659 {
660 int status, credits;
661 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) bh->b_data;
662 struct ocfs2_chain_list *cl;
663 struct ocfs2_alloc_context *ac = NULL;
664 handle_t *handle = NULL;
665 u16 alloc_rec;
666 struct buffer_head *bg_bh = NULL;
667 struct ocfs2_group_desc *bg;
668
669 BUG_ON(ocfs2_is_cluster_bitmap(alloc_inode));
670
671 cl = &fe->id2.i_chain;
672 status = ocfs2_reserve_clusters_with_limit(osb,
673 le16_to_cpu(cl->cl_cpg),
674 max_block, flags, &ac);
675 if (status < 0) {
676 if (status != -ENOSPC)
677 mlog_errno(status);
678 goto bail;
679 }
680
681 credits = ocfs2_calc_group_alloc_credits(osb->sb,
682 le16_to_cpu(cl->cl_cpg));
683 handle = ocfs2_start_trans(osb, credits);
684 if (IS_ERR(handle)) {
685 status = PTR_ERR(handle);
686 handle = NULL;
687 mlog_errno(status);
688 goto bail;
689 }
690
691 if (last_alloc_group && *last_alloc_group != 0) {
692 trace_ocfs2_block_group_alloc(
693 (unsigned long long)*last_alloc_group);
694 ac->ac_last_group = *last_alloc_group;
695 }
696
697 bg_bh = ocfs2_block_group_alloc_contig(osb, handle, alloc_inode,
698 ac, cl);
699 if (PTR_ERR(bg_bh) == -ENOSPC)
700 bg_bh = ocfs2_block_group_alloc_discontig(handle,
701 alloc_inode,
702 ac, cl);
703 if (IS_ERR(bg_bh)) {
704 status = PTR_ERR(bg_bh);
705 bg_bh = NULL;
706 if (status != -ENOSPC)
707 mlog_errno(status);
708 goto bail;
709 }
710 bg = (struct ocfs2_group_desc *) bg_bh->b_data;
711
712 status = ocfs2_journal_access_di(handle, INODE_CACHE(alloc_inode),
713 bh, OCFS2_JOURNAL_ACCESS_WRITE);
714 if (status < 0) {
715 mlog_errno(status);
716 goto bail;
717 }
718
719 alloc_rec = le16_to_cpu(bg->bg_chain);
720 le32_add_cpu(&cl->cl_recs[alloc_rec].c_free,
721 le16_to_cpu(bg->bg_free_bits_count));
722 le32_add_cpu(&cl->cl_recs[alloc_rec].c_total,
723 le16_to_cpu(bg->bg_bits));
724 cl->cl_recs[alloc_rec].c_blkno = bg->bg_blkno;
725 if (le16_to_cpu(cl->cl_next_free_rec) < le16_to_cpu(cl->cl_count))
726 le16_add_cpu(&cl->cl_next_free_rec, 1);
727
728 le32_add_cpu(&fe->id1.bitmap1.i_used, le16_to_cpu(bg->bg_bits) -
729 le16_to_cpu(bg->bg_free_bits_count));
730 le32_add_cpu(&fe->id1.bitmap1.i_total, le16_to_cpu(bg->bg_bits));
731 le32_add_cpu(&fe->i_clusters, le16_to_cpu(cl->cl_cpg));
732
733 ocfs2_journal_dirty(handle, bh);
734
735 spin_lock(&OCFS2_I(alloc_inode)->ip_lock);
736 OCFS2_I(alloc_inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
737 fe->i_size = cpu_to_le64(ocfs2_clusters_to_bytes(alloc_inode->i_sb,
738 le32_to_cpu(fe->i_clusters)));
739 spin_unlock(&OCFS2_I(alloc_inode)->ip_lock);
740 i_size_write(alloc_inode, le64_to_cpu(fe->i_size));
741 alloc_inode->i_blocks = ocfs2_inode_sector_count(alloc_inode);
742 ocfs2_update_inode_fsync_trans(handle, alloc_inode, 0);
743
744 status = 0;
745
746 /* save the new last alloc group so that the caller can cache it. */
747 if (last_alloc_group)
748 *last_alloc_group = ac->ac_last_group;
749
750 bail:
751 if (handle)
752 ocfs2_commit_trans(osb, handle);
753
754 if (ac)
755 ocfs2_free_alloc_context(ac);
756
757 brelse(bg_bh);
758
759 if (status)
760 mlog_errno(status);
761 return status;
762 }
763
ocfs2_reserve_suballoc_bits(struct ocfs2_super * osb,struct ocfs2_alloc_context * ac,int type,u32 slot,u64 * last_alloc_group,int flags)764 static int ocfs2_reserve_suballoc_bits(struct ocfs2_super *osb,
765 struct ocfs2_alloc_context *ac,
766 int type,
767 u32 slot,
768 u64 *last_alloc_group,
769 int flags)
770 {
771 int status;
772 u32 bits_wanted = ac->ac_bits_wanted;
773 struct inode *alloc_inode;
774 struct buffer_head *bh = NULL;
775 struct ocfs2_dinode *fe;
776 u32 free_bits;
777
778 alloc_inode = ocfs2_get_system_file_inode(osb, type, slot);
779 if (!alloc_inode) {
780 mlog_errno(-EINVAL);
781 return -EINVAL;
782 }
783
784 inode_lock(alloc_inode);
785
786 status = ocfs2_inode_lock(alloc_inode, &bh, 1);
787 if (status < 0) {
788 inode_unlock(alloc_inode);
789 iput(alloc_inode);
790
791 mlog_errno(status);
792 return status;
793 }
794
795 ac->ac_inode = alloc_inode;
796 ac->ac_alloc_slot = slot;
797
798 fe = (struct ocfs2_dinode *) bh->b_data;
799
800 /* The bh was validated by the inode read inside
801 * ocfs2_inode_lock(). Any corruption is a code bug. */
802 BUG_ON(!OCFS2_IS_VALID_DINODE(fe));
803
804 if (!(fe->i_flags & cpu_to_le32(OCFS2_CHAIN_FL))) {
805 status = ocfs2_error(alloc_inode->i_sb,
806 "Invalid chain allocator %llu\n",
807 (unsigned long long)le64_to_cpu(fe->i_blkno));
808 goto bail;
809 }
810
811 free_bits = le32_to_cpu(fe->id1.bitmap1.i_total) -
812 le32_to_cpu(fe->id1.bitmap1.i_used);
813
814 if (bits_wanted > free_bits) {
815 /* cluster bitmap never grows */
816 if (ocfs2_is_cluster_bitmap(alloc_inode)) {
817 trace_ocfs2_reserve_suballoc_bits_nospc(bits_wanted,
818 free_bits);
819 status = -ENOSPC;
820 goto bail;
821 }
822
823 if (!(flags & ALLOC_NEW_GROUP)) {
824 trace_ocfs2_reserve_suballoc_bits_no_new_group(
825 slot, bits_wanted, free_bits);
826 status = -ENOSPC;
827 goto bail;
828 }
829
830 status = ocfs2_block_group_alloc(osb, alloc_inode, bh,
831 ac->ac_max_block,
832 last_alloc_group, flags);
833 if (status < 0) {
834 if (status != -ENOSPC)
835 mlog_errno(status);
836 goto bail;
837 }
838 atomic_inc(&osb->alloc_stats.bg_extends);
839
840 /* You should never ask for this much metadata */
841 BUG_ON(bits_wanted >
842 (le32_to_cpu(fe->id1.bitmap1.i_total)
843 - le32_to_cpu(fe->id1.bitmap1.i_used)));
844 }
845
846 get_bh(bh);
847 ac->ac_bh = bh;
848 bail:
849 brelse(bh);
850
851 if (status)
852 mlog_errno(status);
853 return status;
854 }
855
ocfs2_init_inode_steal_slot(struct ocfs2_super * osb)856 static void ocfs2_init_inode_steal_slot(struct ocfs2_super *osb)
857 {
858 spin_lock(&osb->osb_lock);
859 osb->s_inode_steal_slot = OCFS2_INVALID_SLOT;
860 spin_unlock(&osb->osb_lock);
861 atomic_set(&osb->s_num_inodes_stolen, 0);
862 }
863
ocfs2_init_meta_steal_slot(struct ocfs2_super * osb)864 static void ocfs2_init_meta_steal_slot(struct ocfs2_super *osb)
865 {
866 spin_lock(&osb->osb_lock);
867 osb->s_meta_steal_slot = OCFS2_INVALID_SLOT;
868 spin_unlock(&osb->osb_lock);
869 atomic_set(&osb->s_num_meta_stolen, 0);
870 }
871
ocfs2_init_steal_slots(struct ocfs2_super * osb)872 void ocfs2_init_steal_slots(struct ocfs2_super *osb)
873 {
874 ocfs2_init_inode_steal_slot(osb);
875 ocfs2_init_meta_steal_slot(osb);
876 }
877
__ocfs2_set_steal_slot(struct ocfs2_super * osb,int slot,int type)878 static void __ocfs2_set_steal_slot(struct ocfs2_super *osb, int slot, int type)
879 {
880 spin_lock(&osb->osb_lock);
881 if (type == INODE_ALLOC_SYSTEM_INODE)
882 osb->s_inode_steal_slot = (u16)slot;
883 else if (type == EXTENT_ALLOC_SYSTEM_INODE)
884 osb->s_meta_steal_slot = (u16)slot;
885 spin_unlock(&osb->osb_lock);
886 }
887
__ocfs2_get_steal_slot(struct ocfs2_super * osb,int type)888 static int __ocfs2_get_steal_slot(struct ocfs2_super *osb, int type)
889 {
890 int slot = OCFS2_INVALID_SLOT;
891
892 spin_lock(&osb->osb_lock);
893 if (type == INODE_ALLOC_SYSTEM_INODE)
894 slot = osb->s_inode_steal_slot;
895 else if (type == EXTENT_ALLOC_SYSTEM_INODE)
896 slot = osb->s_meta_steal_slot;
897 spin_unlock(&osb->osb_lock);
898
899 return slot;
900 }
901
ocfs2_get_inode_steal_slot(struct ocfs2_super * osb)902 static int ocfs2_get_inode_steal_slot(struct ocfs2_super *osb)
903 {
904 return __ocfs2_get_steal_slot(osb, INODE_ALLOC_SYSTEM_INODE);
905 }
906
ocfs2_get_meta_steal_slot(struct ocfs2_super * osb)907 static int ocfs2_get_meta_steal_slot(struct ocfs2_super *osb)
908 {
909 return __ocfs2_get_steal_slot(osb, EXTENT_ALLOC_SYSTEM_INODE);
910 }
911
ocfs2_steal_resource(struct ocfs2_super * osb,struct ocfs2_alloc_context * ac,int type)912 static int ocfs2_steal_resource(struct ocfs2_super *osb,
913 struct ocfs2_alloc_context *ac,
914 int type)
915 {
916 int i, status = -ENOSPC;
917 int slot = __ocfs2_get_steal_slot(osb, type);
918
919 /* Start to steal resource from the first slot after ours. */
920 if (slot == OCFS2_INVALID_SLOT)
921 slot = osb->slot_num + 1;
922
923 for (i = 0; i < osb->max_slots; i++, slot++) {
924 if (slot == osb->max_slots)
925 slot = 0;
926
927 if (slot == osb->slot_num)
928 continue;
929
930 status = ocfs2_reserve_suballoc_bits(osb, ac,
931 type,
932 (u32)slot, NULL,
933 NOT_ALLOC_NEW_GROUP);
934 if (status >= 0) {
935 __ocfs2_set_steal_slot(osb, slot, type);
936 break;
937 }
938
939 ocfs2_free_ac_resource(ac);
940 }
941
942 return status;
943 }
944
ocfs2_steal_inode(struct ocfs2_super * osb,struct ocfs2_alloc_context * ac)945 static int ocfs2_steal_inode(struct ocfs2_super *osb,
946 struct ocfs2_alloc_context *ac)
947 {
948 return ocfs2_steal_resource(osb, ac, INODE_ALLOC_SYSTEM_INODE);
949 }
950
ocfs2_steal_meta(struct ocfs2_super * osb,struct ocfs2_alloc_context * ac)951 static int ocfs2_steal_meta(struct ocfs2_super *osb,
952 struct ocfs2_alloc_context *ac)
953 {
954 return ocfs2_steal_resource(osb, ac, EXTENT_ALLOC_SYSTEM_INODE);
955 }
956
ocfs2_reserve_new_metadata_blocks(struct ocfs2_super * osb,int blocks,struct ocfs2_alloc_context ** ac)957 int ocfs2_reserve_new_metadata_blocks(struct ocfs2_super *osb,
958 int blocks,
959 struct ocfs2_alloc_context **ac)
960 {
961 int status;
962 int slot = ocfs2_get_meta_steal_slot(osb);
963
964 *ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
965 if (!(*ac)) {
966 status = -ENOMEM;
967 mlog_errno(status);
968 goto bail;
969 }
970
971 (*ac)->ac_bits_wanted = blocks;
972 (*ac)->ac_which = OCFS2_AC_USE_META;
973 (*ac)->ac_group_search = ocfs2_block_group_search;
974
975 if (slot != OCFS2_INVALID_SLOT &&
976 atomic_read(&osb->s_num_meta_stolen) < OCFS2_MAX_TO_STEAL)
977 goto extent_steal;
978
979 atomic_set(&osb->s_num_meta_stolen, 0);
980 status = ocfs2_reserve_suballoc_bits(osb, (*ac),
981 EXTENT_ALLOC_SYSTEM_INODE,
982 (u32)osb->slot_num, NULL,
983 ALLOC_GROUPS_FROM_GLOBAL|ALLOC_NEW_GROUP);
984
985
986 if (status >= 0) {
987 status = 0;
988 if (slot != OCFS2_INVALID_SLOT)
989 ocfs2_init_meta_steal_slot(osb);
990 goto bail;
991 } else if (status < 0 && status != -ENOSPC) {
992 mlog_errno(status);
993 goto bail;
994 }
995
996 ocfs2_free_ac_resource(*ac);
997
998 extent_steal:
999 status = ocfs2_steal_meta(osb, *ac);
1000 atomic_inc(&osb->s_num_meta_stolen);
1001 if (status < 0) {
1002 if (status != -ENOSPC)
1003 mlog_errno(status);
1004 goto bail;
1005 }
1006
1007 status = 0;
1008 bail:
1009 if ((status < 0) && *ac) {
1010 ocfs2_free_alloc_context(*ac);
1011 *ac = NULL;
1012 }
1013
1014 if (status)
1015 mlog_errno(status);
1016 return status;
1017 }
1018
ocfs2_reserve_new_metadata(struct ocfs2_super * osb,struct ocfs2_extent_list * root_el,struct ocfs2_alloc_context ** ac)1019 int ocfs2_reserve_new_metadata(struct ocfs2_super *osb,
1020 struct ocfs2_extent_list *root_el,
1021 struct ocfs2_alloc_context **ac)
1022 {
1023 return ocfs2_reserve_new_metadata_blocks(osb,
1024 ocfs2_extend_meta_needed(root_el),
1025 ac);
1026 }
1027
ocfs2_reserve_new_inode(struct ocfs2_super * osb,struct ocfs2_alloc_context ** ac)1028 int ocfs2_reserve_new_inode(struct ocfs2_super *osb,
1029 struct ocfs2_alloc_context **ac)
1030 {
1031 int status;
1032 int slot = ocfs2_get_inode_steal_slot(osb);
1033 u64 alloc_group;
1034
1035 *ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
1036 if (!(*ac)) {
1037 status = -ENOMEM;
1038 mlog_errno(status);
1039 goto bail;
1040 }
1041
1042 (*ac)->ac_bits_wanted = 1;
1043 (*ac)->ac_which = OCFS2_AC_USE_INODE;
1044
1045 (*ac)->ac_group_search = ocfs2_block_group_search;
1046
1047 /*
1048 * stat(2) can't handle i_ino > 32bits, so we tell the
1049 * lower levels not to allocate us a block group past that
1050 * limit. The 'inode64' mount option avoids this behavior.
1051 */
1052 if (!(osb->s_mount_opt & OCFS2_MOUNT_INODE64))
1053 (*ac)->ac_max_block = (u32)~0U;
1054
1055 /*
1056 * slot is set when we successfully steal inode from other nodes.
1057 * It is reset in 3 places:
1058 * 1. when we flush the truncate log
1059 * 2. when we complete local alloc recovery.
1060 * 3. when we successfully allocate from our own slot.
1061 * After it is set, we will go on stealing inodes until we find the
1062 * need to check our slots to see whether there is some space for us.
1063 */
1064 if (slot != OCFS2_INVALID_SLOT &&
1065 atomic_read(&osb->s_num_inodes_stolen) < OCFS2_MAX_TO_STEAL)
1066 goto inode_steal;
1067
1068 atomic_set(&osb->s_num_inodes_stolen, 0);
1069 alloc_group = osb->osb_inode_alloc_group;
1070 status = ocfs2_reserve_suballoc_bits(osb, *ac,
1071 INODE_ALLOC_SYSTEM_INODE,
1072 (u32)osb->slot_num,
1073 &alloc_group,
1074 ALLOC_NEW_GROUP |
1075 ALLOC_GROUPS_FROM_GLOBAL);
1076 if (status >= 0) {
1077 status = 0;
1078
1079 spin_lock(&osb->osb_lock);
1080 osb->osb_inode_alloc_group = alloc_group;
1081 spin_unlock(&osb->osb_lock);
1082 trace_ocfs2_reserve_new_inode_new_group(
1083 (unsigned long long)alloc_group);
1084
1085 /*
1086 * Some inodes must be freed by us, so try to allocate
1087 * from our own next time.
1088 */
1089 if (slot != OCFS2_INVALID_SLOT)
1090 ocfs2_init_inode_steal_slot(osb);
1091 goto bail;
1092 } else if (status < 0 && status != -ENOSPC) {
1093 mlog_errno(status);
1094 goto bail;
1095 }
1096
1097 ocfs2_free_ac_resource(*ac);
1098
1099 inode_steal:
1100 status = ocfs2_steal_inode(osb, *ac);
1101 atomic_inc(&osb->s_num_inodes_stolen);
1102 if (status < 0) {
1103 if (status != -ENOSPC)
1104 mlog_errno(status);
1105 goto bail;
1106 }
1107
1108 status = 0;
1109 bail:
1110 if ((status < 0) && *ac) {
1111 ocfs2_free_alloc_context(*ac);
1112 *ac = NULL;
1113 }
1114
1115 if (status)
1116 mlog_errno(status);
1117 return status;
1118 }
1119
1120 /* local alloc code has to do the same thing, so rather than do this
1121 * twice.. */
ocfs2_reserve_cluster_bitmap_bits(struct ocfs2_super * osb,struct ocfs2_alloc_context * ac)1122 int ocfs2_reserve_cluster_bitmap_bits(struct ocfs2_super *osb,
1123 struct ocfs2_alloc_context *ac)
1124 {
1125 int status;
1126
1127 ac->ac_which = OCFS2_AC_USE_MAIN;
1128 ac->ac_group_search = ocfs2_cluster_group_search;
1129
1130 status = ocfs2_reserve_suballoc_bits(osb, ac,
1131 GLOBAL_BITMAP_SYSTEM_INODE,
1132 OCFS2_INVALID_SLOT, NULL,
1133 ALLOC_NEW_GROUP);
1134 if (status < 0 && status != -ENOSPC)
1135 mlog_errno(status);
1136
1137 return status;
1138 }
1139
1140 /* Callers don't need to care which bitmap (local alloc or main) to
1141 * use so we figure it out for them, but unfortunately this clutters
1142 * things a bit. */
ocfs2_reserve_clusters_with_limit(struct ocfs2_super * osb,u32 bits_wanted,u64 max_block,int flags,struct ocfs2_alloc_context ** ac)1143 static int ocfs2_reserve_clusters_with_limit(struct ocfs2_super *osb,
1144 u32 bits_wanted, u64 max_block,
1145 int flags,
1146 struct ocfs2_alloc_context **ac)
1147 {
1148 int status, ret = 0;
1149 int retried = 0;
1150
1151 *ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
1152 if (!(*ac)) {
1153 status = -ENOMEM;
1154 mlog_errno(status);
1155 goto bail;
1156 }
1157
1158 (*ac)->ac_bits_wanted = bits_wanted;
1159 (*ac)->ac_max_block = max_block;
1160
1161 status = -ENOSPC;
1162 if (!(flags & ALLOC_GROUPS_FROM_GLOBAL) &&
1163 ocfs2_alloc_should_use_local(osb, bits_wanted)) {
1164 status = ocfs2_reserve_local_alloc_bits(osb,
1165 bits_wanted,
1166 *ac);
1167 if ((status < 0) && (status != -ENOSPC)) {
1168 mlog_errno(status);
1169 goto bail;
1170 }
1171 }
1172
1173 if (status == -ENOSPC) {
1174 retry:
1175 status = ocfs2_reserve_cluster_bitmap_bits(osb, *ac);
1176 /* Retry if there is sufficient space cached in truncate log */
1177 if (status == -ENOSPC && !retried) {
1178 retried = 1;
1179 ocfs2_inode_unlock((*ac)->ac_inode, 1);
1180 inode_unlock((*ac)->ac_inode);
1181
1182 ret = ocfs2_try_to_free_truncate_log(osb, bits_wanted);
1183 if (ret == 1) {
1184 iput((*ac)->ac_inode);
1185 (*ac)->ac_inode = NULL;
1186 goto retry;
1187 }
1188
1189 if (ret < 0)
1190 mlog_errno(ret);
1191
1192 inode_lock((*ac)->ac_inode);
1193 ret = ocfs2_inode_lock((*ac)->ac_inode, NULL, 1);
1194 if (ret < 0) {
1195 mlog_errno(ret);
1196 inode_unlock((*ac)->ac_inode);
1197 iput((*ac)->ac_inode);
1198 (*ac)->ac_inode = NULL;
1199 goto bail;
1200 }
1201 }
1202 if (status < 0) {
1203 if (status != -ENOSPC)
1204 mlog_errno(status);
1205 goto bail;
1206 }
1207 }
1208
1209 status = 0;
1210 bail:
1211 if ((status < 0) && *ac) {
1212 ocfs2_free_alloc_context(*ac);
1213 *ac = NULL;
1214 }
1215
1216 if (status)
1217 mlog_errno(status);
1218 return status;
1219 }
1220
ocfs2_reserve_clusters(struct ocfs2_super * osb,u32 bits_wanted,struct ocfs2_alloc_context ** ac)1221 int ocfs2_reserve_clusters(struct ocfs2_super *osb,
1222 u32 bits_wanted,
1223 struct ocfs2_alloc_context **ac)
1224 {
1225 return ocfs2_reserve_clusters_with_limit(osb, bits_wanted, 0,
1226 ALLOC_NEW_GROUP, ac);
1227 }
1228
1229 /*
1230 * More or less lifted from ext3. I'll leave their description below:
1231 *
1232 * "For ext3 allocations, we must not reuse any blocks which are
1233 * allocated in the bitmap buffer's "last committed data" copy. This
1234 * prevents deletes from freeing up the page for reuse until we have
1235 * committed the delete transaction.
1236 *
1237 * If we didn't do this, then deleting something and reallocating it as
1238 * data would allow the old block to be overwritten before the
1239 * transaction committed (because we force data to disk before commit).
1240 * This would lead to corruption if we crashed between overwriting the
1241 * data and committing the delete.
1242 *
1243 * @@@ We may want to make this allocation behaviour conditional on
1244 * data-writes at some point, and disable it for metadata allocations or
1245 * sync-data inodes."
1246 *
1247 * Note: OCFS2 already does this differently for metadata vs data
1248 * allocations, as those bitmaps are separate and undo access is never
1249 * called on a metadata group descriptor.
1250 */
ocfs2_test_bg_bit_allocatable(struct buffer_head * bg_bh,int nr)1251 static int ocfs2_test_bg_bit_allocatable(struct buffer_head *bg_bh,
1252 int nr)
1253 {
1254 struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data;
1255 struct journal_head *jh;
1256 int ret;
1257
1258 if (ocfs2_test_bit(nr, (unsigned long *)bg->bg_bitmap))
1259 return 0;
1260
1261 jh = jbd2_journal_grab_journal_head(bg_bh);
1262 if (!jh)
1263 return 1;
1264
1265 spin_lock(&jh->b_state_lock);
1266 bg = (struct ocfs2_group_desc *) jh->b_committed_data;
1267 if (bg)
1268 ret = !ocfs2_test_bit(nr, (unsigned long *)bg->bg_bitmap);
1269 else
1270 ret = 1;
1271 spin_unlock(&jh->b_state_lock);
1272 jbd2_journal_put_journal_head(jh);
1273
1274 return ret;
1275 }
1276
ocfs2_block_group_find_clear_bits(struct ocfs2_super * osb,struct buffer_head * bg_bh,unsigned int bits_wanted,unsigned int total_bits,struct ocfs2_suballoc_result * res)1277 static int ocfs2_block_group_find_clear_bits(struct ocfs2_super *osb,
1278 struct buffer_head *bg_bh,
1279 unsigned int bits_wanted,
1280 unsigned int total_bits,
1281 struct ocfs2_suballoc_result *res)
1282 {
1283 void *bitmap;
1284 u16 best_offset, best_size;
1285 int offset, start, found, status = 0;
1286 struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data;
1287
1288 /* Callers got this descriptor from
1289 * ocfs2_read_group_descriptor(). Any corruption is a code bug. */
1290 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
1291
1292 found = start = best_offset = best_size = 0;
1293 bitmap = bg->bg_bitmap;
1294
1295 while((offset = ocfs2_find_next_zero_bit(bitmap, total_bits, start)) != -1) {
1296 if (offset == total_bits)
1297 break;
1298
1299 if (!ocfs2_test_bg_bit_allocatable(bg_bh, offset)) {
1300 /* We found a zero, but we can't use it as it
1301 * hasn't been put to disk yet! */
1302 found = 0;
1303 start = offset + 1;
1304 } else if (offset == start) {
1305 /* we found a zero */
1306 found++;
1307 /* move start to the next bit to test */
1308 start++;
1309 } else {
1310 /* got a zero after some ones */
1311 found = 1;
1312 start = offset + 1;
1313 }
1314 if (found > best_size) {
1315 best_size = found;
1316 best_offset = start - found;
1317 }
1318 /* we got everything we needed */
1319 if (found == bits_wanted) {
1320 /* mlog(0, "Found it all!\n"); */
1321 break;
1322 }
1323 }
1324
1325 if (best_size) {
1326 res->sr_bit_offset = best_offset;
1327 res->sr_bits = best_size;
1328 } else {
1329 status = -ENOSPC;
1330 /* No error log here -- see the comment above
1331 * ocfs2_test_bg_bit_allocatable */
1332 }
1333
1334 return status;
1335 }
1336
ocfs2_block_group_set_bits(handle_t * handle,struct inode * alloc_inode,struct ocfs2_group_desc * bg,struct buffer_head * group_bh,unsigned int bit_off,unsigned int num_bits)1337 int ocfs2_block_group_set_bits(handle_t *handle,
1338 struct inode *alloc_inode,
1339 struct ocfs2_group_desc *bg,
1340 struct buffer_head *group_bh,
1341 unsigned int bit_off,
1342 unsigned int num_bits)
1343 {
1344 int status;
1345 void *bitmap = bg->bg_bitmap;
1346 int journal_type = OCFS2_JOURNAL_ACCESS_WRITE;
1347
1348 /* All callers get the descriptor via
1349 * ocfs2_read_group_descriptor(). Any corruption is a code bug. */
1350 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
1351 BUG_ON(le16_to_cpu(bg->bg_free_bits_count) < num_bits);
1352
1353 trace_ocfs2_block_group_set_bits(bit_off, num_bits);
1354
1355 if (ocfs2_is_cluster_bitmap(alloc_inode))
1356 journal_type = OCFS2_JOURNAL_ACCESS_UNDO;
1357
1358 status = ocfs2_journal_access_gd(handle,
1359 INODE_CACHE(alloc_inode),
1360 group_bh,
1361 journal_type);
1362 if (status < 0) {
1363 mlog_errno(status);
1364 goto bail;
1365 }
1366
1367 le16_add_cpu(&bg->bg_free_bits_count, -num_bits);
1368 if (le16_to_cpu(bg->bg_free_bits_count) > le16_to_cpu(bg->bg_bits)) {
1369 return ocfs2_error(alloc_inode->i_sb, "Group descriptor # %llu has bit count %u but claims %u are freed. num_bits %d\n",
1370 (unsigned long long)le64_to_cpu(bg->bg_blkno),
1371 le16_to_cpu(bg->bg_bits),
1372 le16_to_cpu(bg->bg_free_bits_count),
1373 num_bits);
1374 }
1375 while(num_bits--)
1376 ocfs2_set_bit(bit_off++, bitmap);
1377
1378 ocfs2_journal_dirty(handle, group_bh);
1379
1380 bail:
1381 return status;
1382 }
1383
1384 /* find the one with the most empty bits */
ocfs2_find_victim_chain(struct ocfs2_chain_list * cl)1385 static inline u16 ocfs2_find_victim_chain(struct ocfs2_chain_list *cl)
1386 {
1387 u16 curr, best;
1388
1389 BUG_ON(!cl->cl_next_free_rec);
1390
1391 best = curr = 0;
1392 while (curr < le16_to_cpu(cl->cl_next_free_rec)) {
1393 if (le32_to_cpu(cl->cl_recs[curr].c_free) >
1394 le32_to_cpu(cl->cl_recs[best].c_free))
1395 best = curr;
1396 curr++;
1397 }
1398
1399 BUG_ON(best >= le16_to_cpu(cl->cl_next_free_rec));
1400 return best;
1401 }
1402
ocfs2_relink_block_group(handle_t * handle,struct inode * alloc_inode,struct buffer_head * fe_bh,struct buffer_head * bg_bh,struct buffer_head * prev_bg_bh,u16 chain)1403 static int ocfs2_relink_block_group(handle_t *handle,
1404 struct inode *alloc_inode,
1405 struct buffer_head *fe_bh,
1406 struct buffer_head *bg_bh,
1407 struct buffer_head *prev_bg_bh,
1408 u16 chain)
1409 {
1410 int status;
1411 /* there is a really tiny chance the journal calls could fail,
1412 * but we wouldn't want inconsistent blocks in *any* case. */
1413 u64 bg_ptr, prev_bg_ptr;
1414 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) fe_bh->b_data;
1415 struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data;
1416 struct ocfs2_group_desc *prev_bg = (struct ocfs2_group_desc *) prev_bg_bh->b_data;
1417
1418 /* The caller got these descriptors from
1419 * ocfs2_read_group_descriptor(). Any corruption is a code bug. */
1420 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
1421 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(prev_bg));
1422
1423 trace_ocfs2_relink_block_group(
1424 (unsigned long long)le64_to_cpu(fe->i_blkno), chain,
1425 (unsigned long long)le64_to_cpu(bg->bg_blkno),
1426 (unsigned long long)le64_to_cpu(prev_bg->bg_blkno));
1427
1428 bg_ptr = le64_to_cpu(bg->bg_next_group);
1429 prev_bg_ptr = le64_to_cpu(prev_bg->bg_next_group);
1430
1431 status = ocfs2_journal_access_gd(handle, INODE_CACHE(alloc_inode),
1432 prev_bg_bh,
1433 OCFS2_JOURNAL_ACCESS_WRITE);
1434 if (status < 0)
1435 goto out;
1436
1437 prev_bg->bg_next_group = bg->bg_next_group;
1438 ocfs2_journal_dirty(handle, prev_bg_bh);
1439
1440 status = ocfs2_journal_access_gd(handle, INODE_CACHE(alloc_inode),
1441 bg_bh, OCFS2_JOURNAL_ACCESS_WRITE);
1442 if (status < 0)
1443 goto out_rollback_prev_bg;
1444
1445 bg->bg_next_group = fe->id2.i_chain.cl_recs[chain].c_blkno;
1446 ocfs2_journal_dirty(handle, bg_bh);
1447
1448 status = ocfs2_journal_access_di(handle, INODE_CACHE(alloc_inode),
1449 fe_bh, OCFS2_JOURNAL_ACCESS_WRITE);
1450 if (status < 0)
1451 goto out_rollback_bg;
1452
1453 fe->id2.i_chain.cl_recs[chain].c_blkno = bg->bg_blkno;
1454 ocfs2_journal_dirty(handle, fe_bh);
1455
1456 out:
1457 if (status < 0)
1458 mlog_errno(status);
1459 return status;
1460
1461 out_rollback_bg:
1462 bg->bg_next_group = cpu_to_le64(bg_ptr);
1463 out_rollback_prev_bg:
1464 prev_bg->bg_next_group = cpu_to_le64(prev_bg_ptr);
1465 goto out;
1466 }
1467
ocfs2_block_group_reasonably_empty(struct ocfs2_group_desc * bg,u32 wanted)1468 static inline int ocfs2_block_group_reasonably_empty(struct ocfs2_group_desc *bg,
1469 u32 wanted)
1470 {
1471 return le16_to_cpu(bg->bg_free_bits_count) > wanted;
1472 }
1473
1474 /* return 0 on success, -ENOSPC to keep searching and any other < 0
1475 * value on error. */
ocfs2_cluster_group_search(struct inode * inode,struct buffer_head * group_bh,u32 bits_wanted,u32 min_bits,u64 max_block,struct ocfs2_suballoc_result * res)1476 static int ocfs2_cluster_group_search(struct inode *inode,
1477 struct buffer_head *group_bh,
1478 u32 bits_wanted, u32 min_bits,
1479 u64 max_block,
1480 struct ocfs2_suballoc_result *res)
1481 {
1482 int search = -ENOSPC;
1483 int ret;
1484 u64 blkoff;
1485 struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *) group_bh->b_data;
1486 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1487 unsigned int max_bits, gd_cluster_off;
1488
1489 BUG_ON(!ocfs2_is_cluster_bitmap(inode));
1490
1491 if (gd->bg_free_bits_count) {
1492 max_bits = le16_to_cpu(gd->bg_bits);
1493
1494 /* Tail groups in cluster bitmaps which aren't cpg
1495 * aligned are prone to partial extension by a failed
1496 * fs resize. If the file system resize never got to
1497 * update the dinode cluster count, then we don't want
1498 * to trust any clusters past it, regardless of what
1499 * the group descriptor says. */
1500 gd_cluster_off = ocfs2_blocks_to_clusters(inode->i_sb,
1501 le64_to_cpu(gd->bg_blkno));
1502 if ((gd_cluster_off + max_bits) >
1503 OCFS2_I(inode)->ip_clusters) {
1504 max_bits = OCFS2_I(inode)->ip_clusters - gd_cluster_off;
1505 trace_ocfs2_cluster_group_search_wrong_max_bits(
1506 (unsigned long long)le64_to_cpu(gd->bg_blkno),
1507 le16_to_cpu(gd->bg_bits),
1508 OCFS2_I(inode)->ip_clusters, max_bits);
1509 }
1510
1511 ret = ocfs2_block_group_find_clear_bits(osb,
1512 group_bh, bits_wanted,
1513 max_bits, res);
1514 if (ret)
1515 return ret;
1516
1517 if (max_block) {
1518 blkoff = ocfs2_clusters_to_blocks(inode->i_sb,
1519 gd_cluster_off +
1520 res->sr_bit_offset +
1521 res->sr_bits);
1522 trace_ocfs2_cluster_group_search_max_block(
1523 (unsigned long long)blkoff,
1524 (unsigned long long)max_block);
1525 if (blkoff > max_block)
1526 return -ENOSPC;
1527 }
1528
1529 /* ocfs2_block_group_find_clear_bits() might
1530 * return success, but we still want to return
1531 * -ENOSPC unless it found the minimum number
1532 * of bits. */
1533 if (min_bits <= res->sr_bits)
1534 search = 0; /* success */
1535 else if (res->sr_bits) {
1536 /*
1537 * Don't show bits which we'll be returning
1538 * for allocation to the local alloc bitmap.
1539 */
1540 ocfs2_local_alloc_seen_free_bits(osb, res->sr_bits);
1541 }
1542 }
1543
1544 return search;
1545 }
1546
ocfs2_block_group_search(struct inode * inode,struct buffer_head * group_bh,u32 bits_wanted,u32 min_bits,u64 max_block,struct ocfs2_suballoc_result * res)1547 static int ocfs2_block_group_search(struct inode *inode,
1548 struct buffer_head *group_bh,
1549 u32 bits_wanted, u32 min_bits,
1550 u64 max_block,
1551 struct ocfs2_suballoc_result *res)
1552 {
1553 int ret = -ENOSPC;
1554 u64 blkoff;
1555 struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) group_bh->b_data;
1556
1557 BUG_ON(min_bits != 1);
1558 BUG_ON(ocfs2_is_cluster_bitmap(inode));
1559
1560 if (bg->bg_free_bits_count) {
1561 ret = ocfs2_block_group_find_clear_bits(OCFS2_SB(inode->i_sb),
1562 group_bh, bits_wanted,
1563 le16_to_cpu(bg->bg_bits),
1564 res);
1565 if (!ret && max_block) {
1566 blkoff = le64_to_cpu(bg->bg_blkno) +
1567 res->sr_bit_offset + res->sr_bits;
1568 trace_ocfs2_block_group_search_max_block(
1569 (unsigned long long)blkoff,
1570 (unsigned long long)max_block);
1571 if (blkoff > max_block)
1572 ret = -ENOSPC;
1573 }
1574 }
1575
1576 return ret;
1577 }
1578
ocfs2_alloc_dinode_update_counts(struct inode * inode,handle_t * handle,struct buffer_head * di_bh,u32 num_bits,u16 chain)1579 int ocfs2_alloc_dinode_update_counts(struct inode *inode,
1580 handle_t *handle,
1581 struct buffer_head *di_bh,
1582 u32 num_bits,
1583 u16 chain)
1584 {
1585 int ret;
1586 u32 tmp_used;
1587 struct ocfs2_dinode *di = (struct ocfs2_dinode *) di_bh->b_data;
1588 struct ocfs2_chain_list *cl = (struct ocfs2_chain_list *) &di->id2.i_chain;
1589
1590 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
1591 OCFS2_JOURNAL_ACCESS_WRITE);
1592 if (ret < 0) {
1593 mlog_errno(ret);
1594 goto out;
1595 }
1596
1597 tmp_used = le32_to_cpu(di->id1.bitmap1.i_used);
1598 di->id1.bitmap1.i_used = cpu_to_le32(num_bits + tmp_used);
1599 le32_add_cpu(&cl->cl_recs[chain].c_free, -num_bits);
1600 ocfs2_journal_dirty(handle, di_bh);
1601
1602 out:
1603 return ret;
1604 }
1605
ocfs2_rollback_alloc_dinode_counts(struct inode * inode,struct buffer_head * di_bh,u32 num_bits,u16 chain)1606 void ocfs2_rollback_alloc_dinode_counts(struct inode *inode,
1607 struct buffer_head *di_bh,
1608 u32 num_bits,
1609 u16 chain)
1610 {
1611 u32 tmp_used;
1612 struct ocfs2_dinode *di = (struct ocfs2_dinode *) di_bh->b_data;
1613 struct ocfs2_chain_list *cl;
1614
1615 cl = (struct ocfs2_chain_list *)&di->id2.i_chain;
1616 tmp_used = le32_to_cpu(di->id1.bitmap1.i_used);
1617 di->id1.bitmap1.i_used = cpu_to_le32(tmp_used - num_bits);
1618 le32_add_cpu(&cl->cl_recs[chain].c_free, num_bits);
1619 }
1620
ocfs2_bg_discontig_fix_by_rec(struct ocfs2_suballoc_result * res,struct ocfs2_extent_rec * rec,struct ocfs2_chain_list * cl)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 = le16_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
ocfs2_bg_discontig_fix_result(struct ocfs2_alloc_context * ac,struct ocfs2_group_desc * bg,struct ocfs2_suballoc_result * res)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
ocfs2_search_one_group(struct ocfs2_alloc_context * ac,handle_t * handle,u32 bits_wanted,u32 min_bits,struct ocfs2_suballoc_result * res,u16 * bits_left)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 ocfs2_rollback_alloc_dinode_counts(alloc_inode, ac->ac_bh,
1723 res->sr_bits,
1724 le16_to_cpu(gd->bg_chain));
1725 mlog_errno(ret);
1726 }
1727
1728 out_loc_only:
1729 *bits_left = le16_to_cpu(gd->bg_free_bits_count);
1730
1731 out:
1732 brelse(group_bh);
1733
1734 return ret;
1735 }
1736
ocfs2_search_chain(struct ocfs2_alloc_context * ac,handle_t * handle,u32 bits_wanted,u32 min_bits,struct ocfs2_suballoc_result * res,u16 * bits_left)1737 static int ocfs2_search_chain(struct ocfs2_alloc_context *ac,
1738 handle_t *handle,
1739 u32 bits_wanted,
1740 u32 min_bits,
1741 struct ocfs2_suballoc_result *res,
1742 u16 *bits_left)
1743 {
1744 int status;
1745 u16 chain;
1746 u64 next_group;
1747 struct inode *alloc_inode = ac->ac_inode;
1748 struct buffer_head *group_bh = NULL;
1749 struct buffer_head *prev_group_bh = NULL;
1750 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) ac->ac_bh->b_data;
1751 struct ocfs2_chain_list *cl = (struct ocfs2_chain_list *) &fe->id2.i_chain;
1752 struct ocfs2_group_desc *bg;
1753
1754 chain = ac->ac_chain;
1755 trace_ocfs2_search_chain_begin(
1756 (unsigned long long)OCFS2_I(alloc_inode)->ip_blkno,
1757 bits_wanted, chain);
1758
1759 status = ocfs2_read_group_descriptor(alloc_inode, fe,
1760 le64_to_cpu(cl->cl_recs[chain].c_blkno),
1761 &group_bh);
1762 if (status < 0) {
1763 mlog_errno(status);
1764 goto bail;
1765 }
1766 bg = (struct ocfs2_group_desc *) group_bh->b_data;
1767
1768 status = -ENOSPC;
1769 /* for now, the chain search is a bit simplistic. We just use
1770 * the 1st group with any empty bits. */
1771 while ((status = ac->ac_group_search(alloc_inode, group_bh,
1772 bits_wanted, min_bits,
1773 ac->ac_max_block,
1774 res)) == -ENOSPC) {
1775 if (!bg->bg_next_group)
1776 break;
1777
1778 brelse(prev_group_bh);
1779 prev_group_bh = NULL;
1780
1781 next_group = le64_to_cpu(bg->bg_next_group);
1782 prev_group_bh = group_bh;
1783 group_bh = NULL;
1784 status = ocfs2_read_group_descriptor(alloc_inode, fe,
1785 next_group, &group_bh);
1786 if (status < 0) {
1787 mlog_errno(status);
1788 goto bail;
1789 }
1790 bg = (struct ocfs2_group_desc *) group_bh->b_data;
1791 }
1792 if (status < 0) {
1793 if (status != -ENOSPC)
1794 mlog_errno(status);
1795 goto bail;
1796 }
1797
1798 trace_ocfs2_search_chain_succ(
1799 (unsigned long long)le64_to_cpu(bg->bg_blkno), res->sr_bits);
1800
1801 res->sr_bg_blkno = le64_to_cpu(bg->bg_blkno);
1802
1803 BUG_ON(res->sr_bits == 0);
1804 if (!status)
1805 ocfs2_bg_discontig_fix_result(ac, bg, res);
1806
1807 /*
1808 * sr_bg_blkno might have been changed by
1809 * ocfs2_bg_discontig_fix_result
1810 */
1811 res->sr_bg_stable_blkno = group_bh->b_blocknr;
1812
1813 /*
1814 * Keep track of previous block descriptor read. When
1815 * we find a target, if we have read more than X
1816 * number of descriptors, and the target is reasonably
1817 * empty, relink him to top of his chain.
1818 *
1819 * We've read 0 extra blocks and only send one more to
1820 * the transaction, yet the next guy to search has a
1821 * much easier time.
1822 *
1823 * Do this *after* figuring out how many bits we're taking out
1824 * of our target group.
1825 */
1826 if (!ac->ac_disable_chain_relink &&
1827 (prev_group_bh) &&
1828 (ocfs2_block_group_reasonably_empty(bg, res->sr_bits))) {
1829 status = ocfs2_relink_block_group(handle, alloc_inode,
1830 ac->ac_bh, group_bh,
1831 prev_group_bh, chain);
1832 if (status < 0) {
1833 mlog_errno(status);
1834 goto bail;
1835 }
1836 }
1837
1838 if (ac->ac_find_loc_only)
1839 goto out_loc_only;
1840
1841 status = ocfs2_alloc_dinode_update_counts(alloc_inode, handle,
1842 ac->ac_bh, res->sr_bits,
1843 chain);
1844 if (status) {
1845 mlog_errno(status);
1846 goto bail;
1847 }
1848
1849 status = ocfs2_block_group_set_bits(handle,
1850 alloc_inode,
1851 bg,
1852 group_bh,
1853 res->sr_bit_offset,
1854 res->sr_bits);
1855 if (status < 0) {
1856 ocfs2_rollback_alloc_dinode_counts(alloc_inode,
1857 ac->ac_bh, res->sr_bits, chain);
1858 mlog_errno(status);
1859 goto bail;
1860 }
1861
1862 trace_ocfs2_search_chain_end(
1863 (unsigned long long)le64_to_cpu(fe->i_blkno),
1864 res->sr_bits);
1865
1866 out_loc_only:
1867 *bits_left = le16_to_cpu(bg->bg_free_bits_count);
1868 bail:
1869 brelse(group_bh);
1870 brelse(prev_group_bh);
1871
1872 if (status)
1873 mlog_errno(status);
1874 return status;
1875 }
1876
1877 /* will give out up to bits_wanted contiguous bits. */
ocfs2_claim_suballoc_bits(struct ocfs2_alloc_context * ac,handle_t * handle,u32 bits_wanted,u32 min_bits,struct ocfs2_suballoc_result * res)1878 static int ocfs2_claim_suballoc_bits(struct ocfs2_alloc_context *ac,
1879 handle_t *handle,
1880 u32 bits_wanted,
1881 u32 min_bits,
1882 struct ocfs2_suballoc_result *res)
1883 {
1884 int status;
1885 u16 victim, i;
1886 u16 bits_left = 0;
1887 u64 hint = ac->ac_last_group;
1888 struct ocfs2_chain_list *cl;
1889 struct ocfs2_dinode *fe;
1890
1891 BUG_ON(ac->ac_bits_given >= ac->ac_bits_wanted);
1892 BUG_ON(bits_wanted > (ac->ac_bits_wanted - ac->ac_bits_given));
1893 BUG_ON(!ac->ac_bh);
1894
1895 fe = (struct ocfs2_dinode *) ac->ac_bh->b_data;
1896
1897 /* The bh was validated by the inode read during
1898 * ocfs2_reserve_suballoc_bits(). Any corruption is a code bug. */
1899 BUG_ON(!OCFS2_IS_VALID_DINODE(fe));
1900
1901 if (le32_to_cpu(fe->id1.bitmap1.i_used) >=
1902 le32_to_cpu(fe->id1.bitmap1.i_total)) {
1903 status = ocfs2_error(ac->ac_inode->i_sb,
1904 "Chain allocator dinode %llu has %u used bits but only %u total\n",
1905 (unsigned long long)le64_to_cpu(fe->i_blkno),
1906 le32_to_cpu(fe->id1.bitmap1.i_used),
1907 le32_to_cpu(fe->id1.bitmap1.i_total));
1908 goto bail;
1909 }
1910
1911 res->sr_bg_blkno = hint;
1912 if (res->sr_bg_blkno) {
1913 /* Attempt to short-circuit the usual search mechanism
1914 * by jumping straight to the most recently used
1915 * allocation group. This helps us maintain some
1916 * contiguousness across allocations. */
1917 status = ocfs2_search_one_group(ac, handle, bits_wanted,
1918 min_bits, res, &bits_left);
1919 if (!status)
1920 goto set_hint;
1921 if (status < 0 && status != -ENOSPC) {
1922 mlog_errno(status);
1923 goto bail;
1924 }
1925 }
1926
1927 cl = (struct ocfs2_chain_list *) &fe->id2.i_chain;
1928
1929 victim = ocfs2_find_victim_chain(cl);
1930 ac->ac_chain = victim;
1931
1932 status = ocfs2_search_chain(ac, handle, bits_wanted, min_bits,
1933 res, &bits_left);
1934 if (!status) {
1935 if (ocfs2_is_cluster_bitmap(ac->ac_inode))
1936 hint = res->sr_bg_blkno;
1937 else
1938 hint = ocfs2_group_from_res(res);
1939 goto set_hint;
1940 }
1941 if (status < 0 && status != -ENOSPC) {
1942 mlog_errno(status);
1943 goto bail;
1944 }
1945
1946 trace_ocfs2_claim_suballoc_bits(victim);
1947
1948 /* If we didn't pick a good victim, then just default to
1949 * searching each chain in order. Don't allow chain relinking
1950 * because we only calculate enough journal credits for one
1951 * relink per alloc. */
1952 ac->ac_disable_chain_relink = 1;
1953 for (i = 0; i < le16_to_cpu(cl->cl_next_free_rec); i ++) {
1954 if (i == victim)
1955 continue;
1956 if (!cl->cl_recs[i].c_free)
1957 continue;
1958
1959 ac->ac_chain = i;
1960 status = ocfs2_search_chain(ac, handle, bits_wanted, min_bits,
1961 res, &bits_left);
1962 if (!status) {
1963 hint = ocfs2_group_from_res(res);
1964 break;
1965 }
1966 if (status < 0 && status != -ENOSPC) {
1967 mlog_errno(status);
1968 goto bail;
1969 }
1970 }
1971
1972 set_hint:
1973 if (status != -ENOSPC) {
1974 /* If the next search of this group is not likely to
1975 * yield a suitable extent, then we reset the last
1976 * group hint so as to not waste a disk read */
1977 if (bits_left < min_bits)
1978 ac->ac_last_group = 0;
1979 else
1980 ac->ac_last_group = hint;
1981 }
1982
1983 bail:
1984 if (status)
1985 mlog_errno(status);
1986 return status;
1987 }
1988
ocfs2_claim_metadata(handle_t * handle,struct ocfs2_alloc_context * ac,u32 bits_wanted,u64 * suballoc_loc,u16 * suballoc_bit_start,unsigned int * num_bits,u64 * blkno_start)1989 int ocfs2_claim_metadata(handle_t *handle,
1990 struct ocfs2_alloc_context *ac,
1991 u32 bits_wanted,
1992 u64 *suballoc_loc,
1993 u16 *suballoc_bit_start,
1994 unsigned int *num_bits,
1995 u64 *blkno_start)
1996 {
1997 int status;
1998 struct ocfs2_suballoc_result res = { .sr_blkno = 0, };
1999
2000 BUG_ON(!ac);
2001 BUG_ON(ac->ac_bits_wanted < (ac->ac_bits_given + bits_wanted));
2002 BUG_ON(ac->ac_which != OCFS2_AC_USE_META);
2003
2004 status = ocfs2_claim_suballoc_bits(ac,
2005 handle,
2006 bits_wanted,
2007 1,
2008 &res);
2009 if (status < 0) {
2010 mlog_errno(status);
2011 goto bail;
2012 }
2013 atomic_inc(&OCFS2_SB(ac->ac_inode->i_sb)->alloc_stats.bg_allocs);
2014
2015 *suballoc_loc = res.sr_bg_blkno;
2016 *suballoc_bit_start = res.sr_bit_offset;
2017 *blkno_start = res.sr_blkno;
2018 ac->ac_bits_given += res.sr_bits;
2019 *num_bits = res.sr_bits;
2020 status = 0;
2021 bail:
2022 if (status)
2023 mlog_errno(status);
2024 return status;
2025 }
2026
ocfs2_init_inode_ac_group(struct inode * dir,struct buffer_head * parent_di_bh,struct ocfs2_alloc_context * ac)2027 static void ocfs2_init_inode_ac_group(struct inode *dir,
2028 struct buffer_head *parent_di_bh,
2029 struct ocfs2_alloc_context *ac)
2030 {
2031 struct ocfs2_dinode *di = (struct ocfs2_dinode *)parent_di_bh->b_data;
2032 /*
2033 * Try to allocate inodes from some specific group.
2034 *
2035 * If the parent dir has recorded the last group used in allocation,
2036 * cool, use it. Otherwise if we try to allocate new inode from the
2037 * same slot the parent dir belongs to, use the same chunk.
2038 *
2039 * We are very careful here to avoid the mistake of setting
2040 * ac_last_group to a group descriptor from a different (unlocked) slot.
2041 */
2042 if (OCFS2_I(dir)->ip_last_used_group &&
2043 OCFS2_I(dir)->ip_last_used_slot == ac->ac_alloc_slot)
2044 ac->ac_last_group = OCFS2_I(dir)->ip_last_used_group;
2045 else if (le16_to_cpu(di->i_suballoc_slot) == ac->ac_alloc_slot) {
2046 if (di->i_suballoc_loc)
2047 ac->ac_last_group = le64_to_cpu(di->i_suballoc_loc);
2048 else
2049 ac->ac_last_group = ocfs2_which_suballoc_group(
2050 le64_to_cpu(di->i_blkno),
2051 le16_to_cpu(di->i_suballoc_bit));
2052 }
2053 }
2054
ocfs2_save_inode_ac_group(struct inode * dir,struct ocfs2_alloc_context * ac)2055 static inline void ocfs2_save_inode_ac_group(struct inode *dir,
2056 struct ocfs2_alloc_context *ac)
2057 {
2058 OCFS2_I(dir)->ip_last_used_group = ac->ac_last_group;
2059 OCFS2_I(dir)->ip_last_used_slot = ac->ac_alloc_slot;
2060 }
2061
ocfs2_find_new_inode_loc(struct inode * dir,struct buffer_head * parent_fe_bh,struct ocfs2_alloc_context * ac,u64 * fe_blkno)2062 int ocfs2_find_new_inode_loc(struct inode *dir,
2063 struct buffer_head *parent_fe_bh,
2064 struct ocfs2_alloc_context *ac,
2065 u64 *fe_blkno)
2066 {
2067 int ret;
2068 handle_t *handle = NULL;
2069 struct ocfs2_suballoc_result *res;
2070
2071 BUG_ON(!ac);
2072 BUG_ON(ac->ac_bits_given != 0);
2073 BUG_ON(ac->ac_bits_wanted != 1);
2074 BUG_ON(ac->ac_which != OCFS2_AC_USE_INODE);
2075
2076 res = kzalloc(sizeof(*res), GFP_NOFS);
2077 if (res == NULL) {
2078 ret = -ENOMEM;
2079 mlog_errno(ret);
2080 goto out;
2081 }
2082
2083 ocfs2_init_inode_ac_group(dir, parent_fe_bh, ac);
2084
2085 /*
2086 * The handle started here is for chain relink. Alternatively,
2087 * we could just disable relink for these calls.
2088 */
2089 handle = ocfs2_start_trans(OCFS2_SB(dir->i_sb), OCFS2_SUBALLOC_ALLOC);
2090 if (IS_ERR(handle)) {
2091 ret = PTR_ERR(handle);
2092 handle = NULL;
2093 mlog_errno(ret);
2094 goto out;
2095 }
2096
2097 /*
2098 * This will instruct ocfs2_claim_suballoc_bits and
2099 * ocfs2_search_one_group to search but save actual allocation
2100 * for later.
2101 */
2102 ac->ac_find_loc_only = 1;
2103
2104 ret = ocfs2_claim_suballoc_bits(ac, handle, 1, 1, res);
2105 if (ret < 0) {
2106 mlog_errno(ret);
2107 goto out;
2108 }
2109
2110 ac->ac_find_loc_priv = res;
2111 *fe_blkno = res->sr_blkno;
2112 ocfs2_update_inode_fsync_trans(handle, dir, 0);
2113 out:
2114 if (handle)
2115 ocfs2_commit_trans(OCFS2_SB(dir->i_sb), handle);
2116
2117 if (ret)
2118 kfree(res);
2119
2120 return ret;
2121 }
2122
ocfs2_claim_new_inode_at_loc(handle_t * handle,struct inode * dir,struct ocfs2_alloc_context * ac,u64 * suballoc_loc,u16 * suballoc_bit,u64 di_blkno)2123 int ocfs2_claim_new_inode_at_loc(handle_t *handle,
2124 struct inode *dir,
2125 struct ocfs2_alloc_context *ac,
2126 u64 *suballoc_loc,
2127 u16 *suballoc_bit,
2128 u64 di_blkno)
2129 {
2130 int ret;
2131 u16 chain;
2132 struct ocfs2_suballoc_result *res = ac->ac_find_loc_priv;
2133 struct buffer_head *bg_bh = NULL;
2134 struct ocfs2_group_desc *bg;
2135 struct ocfs2_dinode *di = (struct ocfs2_dinode *) ac->ac_bh->b_data;
2136
2137 /*
2138 * Since di_blkno is being passed back in, we check for any
2139 * inconsistencies which may have happened between
2140 * calls. These are code bugs as di_blkno is not expected to
2141 * change once returned from ocfs2_find_new_inode_loc()
2142 */
2143 BUG_ON(res->sr_blkno != di_blkno);
2144
2145 ret = ocfs2_read_group_descriptor(ac->ac_inode, di,
2146 res->sr_bg_stable_blkno, &bg_bh);
2147 if (ret) {
2148 mlog_errno(ret);
2149 goto out;
2150 }
2151
2152 bg = (struct ocfs2_group_desc *) bg_bh->b_data;
2153 chain = le16_to_cpu(bg->bg_chain);
2154
2155 ret = ocfs2_alloc_dinode_update_counts(ac->ac_inode, handle,
2156 ac->ac_bh, res->sr_bits,
2157 chain);
2158 if (ret) {
2159 mlog_errno(ret);
2160 goto out;
2161 }
2162
2163 ret = ocfs2_block_group_set_bits(handle,
2164 ac->ac_inode,
2165 bg,
2166 bg_bh,
2167 res->sr_bit_offset,
2168 res->sr_bits);
2169 if (ret < 0) {
2170 ocfs2_rollback_alloc_dinode_counts(ac->ac_inode,
2171 ac->ac_bh, res->sr_bits, chain);
2172 mlog_errno(ret);
2173 goto out;
2174 }
2175
2176 trace_ocfs2_claim_new_inode_at_loc((unsigned long long)di_blkno,
2177 res->sr_bits);
2178
2179 atomic_inc(&OCFS2_SB(ac->ac_inode->i_sb)->alloc_stats.bg_allocs);
2180
2181 BUG_ON(res->sr_bits != 1);
2182
2183 *suballoc_loc = res->sr_bg_blkno;
2184 *suballoc_bit = res->sr_bit_offset;
2185 ac->ac_bits_given++;
2186 ocfs2_save_inode_ac_group(dir, ac);
2187
2188 out:
2189 brelse(bg_bh);
2190
2191 return ret;
2192 }
2193
ocfs2_claim_new_inode(handle_t * handle,struct inode * dir,struct buffer_head * parent_fe_bh,struct ocfs2_alloc_context * ac,u64 * suballoc_loc,u16 * suballoc_bit,u64 * fe_blkno)2194 int ocfs2_claim_new_inode(handle_t *handle,
2195 struct inode *dir,
2196 struct buffer_head *parent_fe_bh,
2197 struct ocfs2_alloc_context *ac,
2198 u64 *suballoc_loc,
2199 u16 *suballoc_bit,
2200 u64 *fe_blkno)
2201 {
2202 int status;
2203 struct ocfs2_suballoc_result res;
2204
2205 BUG_ON(!ac);
2206 BUG_ON(ac->ac_bits_given != 0);
2207 BUG_ON(ac->ac_bits_wanted != 1);
2208 BUG_ON(ac->ac_which != OCFS2_AC_USE_INODE);
2209
2210 ocfs2_init_inode_ac_group(dir, parent_fe_bh, ac);
2211
2212 status = ocfs2_claim_suballoc_bits(ac,
2213 handle,
2214 1,
2215 1,
2216 &res);
2217 if (status < 0) {
2218 mlog_errno(status);
2219 goto bail;
2220 }
2221 atomic_inc(&OCFS2_SB(ac->ac_inode->i_sb)->alloc_stats.bg_allocs);
2222
2223 BUG_ON(res.sr_bits != 1);
2224
2225 *suballoc_loc = res.sr_bg_blkno;
2226 *suballoc_bit = res.sr_bit_offset;
2227 *fe_blkno = res.sr_blkno;
2228 ac->ac_bits_given++;
2229 ocfs2_save_inode_ac_group(dir, ac);
2230 status = 0;
2231 bail:
2232 if (status)
2233 mlog_errno(status);
2234 return status;
2235 }
2236
2237 /* translate a group desc. blkno and it's bitmap offset into
2238 * disk cluster offset. */
ocfs2_desc_bitmap_to_cluster_off(struct inode * inode,u64 bg_blkno,u16 bg_bit_off)2239 static inline u32 ocfs2_desc_bitmap_to_cluster_off(struct inode *inode,
2240 u64 bg_blkno,
2241 u16 bg_bit_off)
2242 {
2243 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2244 u32 cluster = 0;
2245
2246 BUG_ON(!ocfs2_is_cluster_bitmap(inode));
2247
2248 if (bg_blkno != osb->first_cluster_group_blkno)
2249 cluster = ocfs2_blocks_to_clusters(inode->i_sb, bg_blkno);
2250 cluster += (u32) bg_bit_off;
2251 return cluster;
2252 }
2253
2254 /* given a cluster offset, calculate which block group it belongs to
2255 * and return that block offset. */
ocfs2_which_cluster_group(struct inode * inode,u32 cluster)2256 u64 ocfs2_which_cluster_group(struct inode *inode, u32 cluster)
2257 {
2258 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2259 u32 group_no;
2260
2261 BUG_ON(!ocfs2_is_cluster_bitmap(inode));
2262
2263 group_no = cluster / osb->bitmap_cpg;
2264 if (!group_no)
2265 return osb->first_cluster_group_blkno;
2266 return ocfs2_clusters_to_blocks(inode->i_sb,
2267 group_no * osb->bitmap_cpg);
2268 }
2269
2270 /* given the block number of a cluster start, calculate which cluster
2271 * group and descriptor bitmap offset that corresponds to. */
ocfs2_block_to_cluster_group(struct inode * inode,u64 data_blkno,u64 * bg_blkno,u16 * bg_bit_off)2272 static inline void ocfs2_block_to_cluster_group(struct inode *inode,
2273 u64 data_blkno,
2274 u64 *bg_blkno,
2275 u16 *bg_bit_off)
2276 {
2277 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2278 u32 data_cluster = ocfs2_blocks_to_clusters(osb->sb, data_blkno);
2279
2280 BUG_ON(!ocfs2_is_cluster_bitmap(inode));
2281
2282 *bg_blkno = ocfs2_which_cluster_group(inode,
2283 data_cluster);
2284
2285 if (*bg_blkno == osb->first_cluster_group_blkno)
2286 *bg_bit_off = (u16) data_cluster;
2287 else
2288 *bg_bit_off = (u16) ocfs2_blocks_to_clusters(osb->sb,
2289 data_blkno - *bg_blkno);
2290 }
2291
2292 /*
2293 * min_bits - minimum contiguous chunk from this total allocation we
2294 * can handle. set to what we asked for originally for a full
2295 * contig. allocation, set to '1' to indicate we can deal with extents
2296 * of any size.
2297 */
__ocfs2_claim_clusters(handle_t * handle,struct ocfs2_alloc_context * ac,u32 min_clusters,u32 max_clusters,u32 * cluster_start,u32 * num_clusters)2298 int __ocfs2_claim_clusters(handle_t *handle,
2299 struct ocfs2_alloc_context *ac,
2300 u32 min_clusters,
2301 u32 max_clusters,
2302 u32 *cluster_start,
2303 u32 *num_clusters)
2304 {
2305 int status;
2306 unsigned int bits_wanted = max_clusters;
2307 struct ocfs2_suballoc_result res = { .sr_blkno = 0, };
2308 struct ocfs2_super *osb = OCFS2_SB(ac->ac_inode->i_sb);
2309
2310 BUG_ON(ac->ac_bits_given >= ac->ac_bits_wanted);
2311
2312 BUG_ON(ac->ac_which != OCFS2_AC_USE_LOCAL
2313 && ac->ac_which != OCFS2_AC_USE_MAIN);
2314
2315 if (ac->ac_which == OCFS2_AC_USE_LOCAL) {
2316 WARN_ON(min_clusters > 1);
2317
2318 status = ocfs2_claim_local_alloc_bits(osb,
2319 handle,
2320 ac,
2321 bits_wanted,
2322 cluster_start,
2323 num_clusters);
2324 if (!status)
2325 atomic_inc(&osb->alloc_stats.local_data);
2326 } else {
2327 if (min_clusters > (osb->bitmap_cpg - 1)) {
2328 /* The only paths asking for contiguousness
2329 * should know about this already. */
2330 mlog(ML_ERROR, "minimum allocation requested %u exceeds "
2331 "group bitmap size %u!\n", min_clusters,
2332 osb->bitmap_cpg);
2333 status = -ENOSPC;
2334 goto bail;
2335 }
2336 /* clamp the current request down to a realistic size. */
2337 if (bits_wanted > (osb->bitmap_cpg - 1))
2338 bits_wanted = osb->bitmap_cpg - 1;
2339
2340 status = ocfs2_claim_suballoc_bits(ac,
2341 handle,
2342 bits_wanted,
2343 min_clusters,
2344 &res);
2345 if (!status) {
2346 BUG_ON(res.sr_blkno); /* cluster alloc can't set */
2347 *cluster_start =
2348 ocfs2_desc_bitmap_to_cluster_off(ac->ac_inode,
2349 res.sr_bg_blkno,
2350 res.sr_bit_offset);
2351 atomic_inc(&osb->alloc_stats.bitmap_data);
2352 *num_clusters = res.sr_bits;
2353 }
2354 }
2355 if (status < 0) {
2356 if (status != -ENOSPC)
2357 mlog_errno(status);
2358 goto bail;
2359 }
2360
2361 ac->ac_bits_given += *num_clusters;
2362
2363 bail:
2364 if (status)
2365 mlog_errno(status);
2366 return status;
2367 }
2368
ocfs2_claim_clusters(handle_t * handle,struct ocfs2_alloc_context * ac,u32 min_clusters,u32 * cluster_start,u32 * num_clusters)2369 int ocfs2_claim_clusters(handle_t *handle,
2370 struct ocfs2_alloc_context *ac,
2371 u32 min_clusters,
2372 u32 *cluster_start,
2373 u32 *num_clusters)
2374 {
2375 unsigned int bits_wanted = ac->ac_bits_wanted - ac->ac_bits_given;
2376
2377 return __ocfs2_claim_clusters(handle, ac, min_clusters,
2378 bits_wanted, cluster_start, num_clusters);
2379 }
2380
ocfs2_block_group_clear_bits(handle_t * handle,struct inode * alloc_inode,struct ocfs2_group_desc * bg,struct buffer_head * group_bh,unsigned int bit_off,unsigned int num_bits,void (* undo_fn)(unsigned int bit,unsigned long * bmap))2381 static int ocfs2_block_group_clear_bits(handle_t *handle,
2382 struct inode *alloc_inode,
2383 struct ocfs2_group_desc *bg,
2384 struct buffer_head *group_bh,
2385 unsigned int bit_off,
2386 unsigned int num_bits,
2387 void (*undo_fn)(unsigned int bit,
2388 unsigned long *bmap))
2389 {
2390 int status;
2391 unsigned int tmp;
2392 struct ocfs2_group_desc *undo_bg = NULL;
2393 struct journal_head *jh;
2394
2395 /* The caller got this descriptor from
2396 * ocfs2_read_group_descriptor(). Any corruption is a code bug. */
2397 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
2398
2399 trace_ocfs2_block_group_clear_bits(bit_off, num_bits);
2400
2401 BUG_ON(undo_fn && !ocfs2_is_cluster_bitmap(alloc_inode));
2402 status = ocfs2_journal_access_gd(handle, INODE_CACHE(alloc_inode),
2403 group_bh,
2404 undo_fn ?
2405 OCFS2_JOURNAL_ACCESS_UNDO :
2406 OCFS2_JOURNAL_ACCESS_WRITE);
2407 if (status < 0) {
2408 mlog_errno(status);
2409 goto bail;
2410 }
2411
2412 jh = bh2jh(group_bh);
2413 if (undo_fn) {
2414 spin_lock(&jh->b_state_lock);
2415 undo_bg = (struct ocfs2_group_desc *) jh->b_committed_data;
2416 BUG_ON(!undo_bg);
2417 }
2418
2419 tmp = num_bits;
2420 while(tmp--) {
2421 ocfs2_clear_bit((bit_off + tmp),
2422 (unsigned long *) bg->bg_bitmap);
2423 if (undo_fn)
2424 undo_fn(bit_off + tmp,
2425 (unsigned long *) undo_bg->bg_bitmap);
2426 }
2427 le16_add_cpu(&bg->bg_free_bits_count, num_bits);
2428 if (le16_to_cpu(bg->bg_free_bits_count) > le16_to_cpu(bg->bg_bits)) {
2429 if (undo_fn)
2430 spin_unlock(&jh->b_state_lock);
2431 return ocfs2_error(alloc_inode->i_sb, "Group descriptor # %llu has bit count %u but claims %u are freed. num_bits %d\n",
2432 (unsigned long long)le64_to_cpu(bg->bg_blkno),
2433 le16_to_cpu(bg->bg_bits),
2434 le16_to_cpu(bg->bg_free_bits_count),
2435 num_bits);
2436 }
2437
2438 if (undo_fn)
2439 spin_unlock(&jh->b_state_lock);
2440
2441 ocfs2_journal_dirty(handle, group_bh);
2442 bail:
2443 return status;
2444 }
2445
2446 /*
2447 * expects the suballoc inode to already be locked.
2448 */
_ocfs2_free_suballoc_bits(handle_t * handle,struct inode * alloc_inode,struct buffer_head * alloc_bh,unsigned int start_bit,u64 bg_blkno,unsigned int count,void (* undo_fn)(unsigned int bit,unsigned long * bitmap))2449 static int _ocfs2_free_suballoc_bits(handle_t *handle,
2450 struct inode *alloc_inode,
2451 struct buffer_head *alloc_bh,
2452 unsigned int start_bit,
2453 u64 bg_blkno,
2454 unsigned int count,
2455 void (*undo_fn)(unsigned int bit,
2456 unsigned long *bitmap))
2457 {
2458 int status = 0;
2459 u32 tmp_used;
2460 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) alloc_bh->b_data;
2461 struct ocfs2_chain_list *cl = &fe->id2.i_chain;
2462 struct buffer_head *group_bh = NULL;
2463 struct ocfs2_group_desc *group;
2464
2465 /* The alloc_bh comes from ocfs2_free_dinode() or
2466 * ocfs2_free_clusters(). The callers have all locked the
2467 * allocator and gotten alloc_bh from the lock call. This
2468 * validates the dinode buffer. Any corruption that has happened
2469 * is a code bug. */
2470 BUG_ON(!OCFS2_IS_VALID_DINODE(fe));
2471 BUG_ON((count + start_bit) > ocfs2_bits_per_group(cl));
2472
2473 trace_ocfs2_free_suballoc_bits(
2474 (unsigned long long)OCFS2_I(alloc_inode)->ip_blkno,
2475 (unsigned long long)bg_blkno,
2476 start_bit, count);
2477
2478 status = ocfs2_read_group_descriptor(alloc_inode, fe, bg_blkno,
2479 &group_bh);
2480 if (status < 0) {
2481 mlog_errno(status);
2482 goto bail;
2483 }
2484 group = (struct ocfs2_group_desc *) group_bh->b_data;
2485
2486 BUG_ON((count + start_bit) > le16_to_cpu(group->bg_bits));
2487
2488 status = ocfs2_block_group_clear_bits(handle, alloc_inode,
2489 group, group_bh,
2490 start_bit, count, undo_fn);
2491 if (status < 0) {
2492 mlog_errno(status);
2493 goto bail;
2494 }
2495
2496 status = ocfs2_journal_access_di(handle, INODE_CACHE(alloc_inode),
2497 alloc_bh, OCFS2_JOURNAL_ACCESS_WRITE);
2498 if (status < 0) {
2499 mlog_errno(status);
2500 ocfs2_block_group_set_bits(handle, alloc_inode, group, group_bh,
2501 start_bit, count);
2502 goto bail;
2503 }
2504
2505 le32_add_cpu(&cl->cl_recs[le16_to_cpu(group->bg_chain)].c_free,
2506 count);
2507 tmp_used = le32_to_cpu(fe->id1.bitmap1.i_used);
2508 fe->id1.bitmap1.i_used = cpu_to_le32(tmp_used - count);
2509 ocfs2_journal_dirty(handle, alloc_bh);
2510
2511 bail:
2512 brelse(group_bh);
2513 return status;
2514 }
2515
ocfs2_free_suballoc_bits(handle_t * handle,struct inode * alloc_inode,struct buffer_head * alloc_bh,unsigned int start_bit,u64 bg_blkno,unsigned int count)2516 int ocfs2_free_suballoc_bits(handle_t *handle,
2517 struct inode *alloc_inode,
2518 struct buffer_head *alloc_bh,
2519 unsigned int start_bit,
2520 u64 bg_blkno,
2521 unsigned int count)
2522 {
2523 return _ocfs2_free_suballoc_bits(handle, alloc_inode, alloc_bh,
2524 start_bit, bg_blkno, count, NULL);
2525 }
2526
ocfs2_free_dinode(handle_t * handle,struct inode * inode_alloc_inode,struct buffer_head * inode_alloc_bh,struct ocfs2_dinode * di)2527 int ocfs2_free_dinode(handle_t *handle,
2528 struct inode *inode_alloc_inode,
2529 struct buffer_head *inode_alloc_bh,
2530 struct ocfs2_dinode *di)
2531 {
2532 u64 blk = le64_to_cpu(di->i_blkno);
2533 u16 bit = le16_to_cpu(di->i_suballoc_bit);
2534 u64 bg_blkno = ocfs2_which_suballoc_group(blk, bit);
2535
2536 if (di->i_suballoc_loc)
2537 bg_blkno = le64_to_cpu(di->i_suballoc_loc);
2538 return ocfs2_free_suballoc_bits(handle, inode_alloc_inode,
2539 inode_alloc_bh, bit, bg_blkno, 1);
2540 }
2541
_ocfs2_free_clusters(handle_t * handle,struct inode * bitmap_inode,struct buffer_head * bitmap_bh,u64 start_blk,unsigned int num_clusters,void (* undo_fn)(unsigned int bit,unsigned long * bitmap))2542 static int _ocfs2_free_clusters(handle_t *handle,
2543 struct inode *bitmap_inode,
2544 struct buffer_head *bitmap_bh,
2545 u64 start_blk,
2546 unsigned int num_clusters,
2547 void (*undo_fn)(unsigned int bit,
2548 unsigned long *bitmap))
2549 {
2550 int status;
2551 u16 bg_start_bit;
2552 u64 bg_blkno;
2553
2554 /* You can't ever have a contiguous set of clusters
2555 * bigger than a block group bitmap so we never have to worry
2556 * about looping on them.
2557 * This is expensive. We can safely remove once this stuff has
2558 * gotten tested really well. */
2559 BUG_ON(start_blk != ocfs2_clusters_to_blocks(bitmap_inode->i_sb,
2560 ocfs2_blocks_to_clusters(bitmap_inode->i_sb,
2561 start_blk)));
2562
2563
2564 ocfs2_block_to_cluster_group(bitmap_inode, start_blk, &bg_blkno,
2565 &bg_start_bit);
2566
2567 trace_ocfs2_free_clusters((unsigned long long)bg_blkno,
2568 (unsigned long long)start_blk,
2569 bg_start_bit, num_clusters);
2570
2571 status = _ocfs2_free_suballoc_bits(handle, bitmap_inode, bitmap_bh,
2572 bg_start_bit, bg_blkno,
2573 num_clusters, undo_fn);
2574 if (status < 0) {
2575 mlog_errno(status);
2576 goto out;
2577 }
2578
2579 ocfs2_local_alloc_seen_free_bits(OCFS2_SB(bitmap_inode->i_sb),
2580 num_clusters);
2581
2582 out:
2583 return status;
2584 }
2585
ocfs2_free_clusters(handle_t * handle,struct inode * bitmap_inode,struct buffer_head * bitmap_bh,u64 start_blk,unsigned int num_clusters)2586 int ocfs2_free_clusters(handle_t *handle,
2587 struct inode *bitmap_inode,
2588 struct buffer_head *bitmap_bh,
2589 u64 start_blk,
2590 unsigned int num_clusters)
2591 {
2592 return _ocfs2_free_clusters(handle, bitmap_inode, bitmap_bh,
2593 start_blk, num_clusters,
2594 _ocfs2_set_bit);
2595 }
2596
2597 /*
2598 * Give never-used clusters back to the global bitmap. We don't need
2599 * to protect these bits in the undo buffer.
2600 */
ocfs2_release_clusters(handle_t * handle,struct inode * bitmap_inode,struct buffer_head * bitmap_bh,u64 start_blk,unsigned int num_clusters)2601 int ocfs2_release_clusters(handle_t *handle,
2602 struct inode *bitmap_inode,
2603 struct buffer_head *bitmap_bh,
2604 u64 start_blk,
2605 unsigned int num_clusters)
2606 {
2607 return _ocfs2_free_clusters(handle, bitmap_inode, bitmap_bh,
2608 start_blk, num_clusters,
2609 _ocfs2_clear_bit);
2610 }
2611
2612 /*
2613 * For a given allocation, determine which allocators will need to be
2614 * accessed, and lock them, reserving the appropriate number of bits.
2615 *
2616 * Sparse file systems call this from ocfs2_write_begin_nolock()
2617 * and ocfs2_allocate_unwritten_extents().
2618 *
2619 * File systems which don't support holes call this from
2620 * ocfs2_extend_allocation().
2621 */
ocfs2_lock_allocators(struct inode * inode,struct ocfs2_extent_tree * et,u32 clusters_to_add,u32 extents_to_split,struct ocfs2_alloc_context ** data_ac,struct ocfs2_alloc_context ** meta_ac)2622 int ocfs2_lock_allocators(struct inode *inode,
2623 struct ocfs2_extent_tree *et,
2624 u32 clusters_to_add, u32 extents_to_split,
2625 struct ocfs2_alloc_context **data_ac,
2626 struct ocfs2_alloc_context **meta_ac)
2627 {
2628 int ret = 0, num_free_extents;
2629 unsigned int max_recs_needed = clusters_to_add + 2 * extents_to_split;
2630 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2631
2632 *meta_ac = NULL;
2633 if (data_ac)
2634 *data_ac = NULL;
2635
2636 BUG_ON(clusters_to_add != 0 && data_ac == NULL);
2637
2638 num_free_extents = ocfs2_num_free_extents(et);
2639 if (num_free_extents < 0) {
2640 ret = num_free_extents;
2641 mlog_errno(ret);
2642 goto out;
2643 }
2644
2645 /*
2646 * Sparse allocation file systems need to be more conservative
2647 * with reserving room for expansion - the actual allocation
2648 * happens while we've got a journal handle open so re-taking
2649 * a cluster lock (because we ran out of room for another
2650 * extent) will violate ordering rules.
2651 *
2652 * Most of the time we'll only be seeing this 1 cluster at a time
2653 * anyway.
2654 *
2655 * Always lock for any unwritten extents - we might want to
2656 * add blocks during a split.
2657 */
2658 if (!num_free_extents ||
2659 (ocfs2_sparse_alloc(osb) && num_free_extents < max_recs_needed)) {
2660 ret = ocfs2_reserve_new_metadata(osb, et->et_root_el, meta_ac);
2661 if (ret < 0) {
2662 if (ret != -ENOSPC)
2663 mlog_errno(ret);
2664 goto out;
2665 }
2666 }
2667
2668 if (clusters_to_add == 0)
2669 goto out;
2670
2671 ret = ocfs2_reserve_clusters(osb, clusters_to_add, data_ac);
2672 if (ret < 0) {
2673 if (ret != -ENOSPC)
2674 mlog_errno(ret);
2675 goto out;
2676 }
2677
2678 out:
2679 if (ret) {
2680 if (*meta_ac) {
2681 ocfs2_free_alloc_context(*meta_ac);
2682 *meta_ac = NULL;
2683 }
2684
2685 /*
2686 * We cannot have an error and a non null *data_ac.
2687 */
2688 }
2689
2690 return ret;
2691 }
2692
2693 /*
2694 * Read the inode specified by blkno to get suballoc_slot and
2695 * suballoc_bit.
2696 */
ocfs2_get_suballoc_slot_bit(struct ocfs2_super * osb,u64 blkno,u16 * suballoc_slot,u64 * group_blkno,u16 * suballoc_bit)2697 static int ocfs2_get_suballoc_slot_bit(struct ocfs2_super *osb, u64 blkno,
2698 u16 *suballoc_slot, u64 *group_blkno,
2699 u16 *suballoc_bit)
2700 {
2701 int status;
2702 struct buffer_head *inode_bh = NULL;
2703 struct ocfs2_dinode *inode_fe;
2704
2705 trace_ocfs2_get_suballoc_slot_bit((unsigned long long)blkno);
2706
2707 /* dirty read disk */
2708 status = ocfs2_read_blocks_sync(osb, blkno, 1, &inode_bh);
2709 if (status < 0) {
2710 mlog(ML_ERROR, "read block %llu failed %d\n",
2711 (unsigned long long)blkno, status);
2712 goto bail;
2713 }
2714
2715 inode_fe = (struct ocfs2_dinode *) inode_bh->b_data;
2716 if (!OCFS2_IS_VALID_DINODE(inode_fe)) {
2717 mlog(ML_ERROR, "invalid inode %llu requested\n",
2718 (unsigned long long)blkno);
2719 status = -EINVAL;
2720 goto bail;
2721 }
2722
2723 if (le16_to_cpu(inode_fe->i_suballoc_slot) != (u16)OCFS2_INVALID_SLOT &&
2724 (u32)le16_to_cpu(inode_fe->i_suballoc_slot) > osb->max_slots - 1) {
2725 mlog(ML_ERROR, "inode %llu has invalid suballoc slot %u\n",
2726 (unsigned long long)blkno,
2727 (u32)le16_to_cpu(inode_fe->i_suballoc_slot));
2728 status = -EINVAL;
2729 goto bail;
2730 }
2731
2732 if (suballoc_slot)
2733 *suballoc_slot = le16_to_cpu(inode_fe->i_suballoc_slot);
2734 if (suballoc_bit)
2735 *suballoc_bit = le16_to_cpu(inode_fe->i_suballoc_bit);
2736 if (group_blkno)
2737 *group_blkno = le64_to_cpu(inode_fe->i_suballoc_loc);
2738
2739 bail:
2740 brelse(inode_bh);
2741
2742 if (status)
2743 mlog_errno(status);
2744 return status;
2745 }
2746
2747 /*
2748 * test whether bit is SET in allocator bitmap or not. on success, 0
2749 * is returned and *res is 1 for SET; 0 otherwise. when fails, errno
2750 * is returned and *res is meaningless. Call this after you have
2751 * cluster locked against suballoc, or you may get a result based on
2752 * non-up2date contents
2753 */
ocfs2_test_suballoc_bit(struct ocfs2_super * osb,struct inode * suballoc,struct buffer_head * alloc_bh,u64 group_blkno,u64 blkno,u16 bit,int * res)2754 static int ocfs2_test_suballoc_bit(struct ocfs2_super *osb,
2755 struct inode *suballoc,
2756 struct buffer_head *alloc_bh,
2757 u64 group_blkno, u64 blkno,
2758 u16 bit, int *res)
2759 {
2760 struct ocfs2_dinode *alloc_di;
2761 struct ocfs2_group_desc *group;
2762 struct buffer_head *group_bh = NULL;
2763 u64 bg_blkno;
2764 int status;
2765
2766 trace_ocfs2_test_suballoc_bit((unsigned long long)blkno,
2767 (unsigned int)bit);
2768
2769 alloc_di = (struct ocfs2_dinode *)alloc_bh->b_data;
2770 if ((bit + 1) > ocfs2_bits_per_group(&alloc_di->id2.i_chain)) {
2771 mlog(ML_ERROR, "suballoc bit %u out of range of %u\n",
2772 (unsigned int)bit,
2773 ocfs2_bits_per_group(&alloc_di->id2.i_chain));
2774 status = -EINVAL;
2775 goto bail;
2776 }
2777
2778 bg_blkno = group_blkno ? group_blkno :
2779 ocfs2_which_suballoc_group(blkno, bit);
2780 status = ocfs2_read_group_descriptor(suballoc, alloc_di, bg_blkno,
2781 &group_bh);
2782 if (status < 0) {
2783 mlog(ML_ERROR, "read group %llu failed %d\n",
2784 (unsigned long long)bg_blkno, status);
2785 goto bail;
2786 }
2787
2788 group = (struct ocfs2_group_desc *) group_bh->b_data;
2789 *res = ocfs2_test_bit(bit, (unsigned long *)group->bg_bitmap);
2790
2791 bail:
2792 brelse(group_bh);
2793
2794 if (status)
2795 mlog_errno(status);
2796 return status;
2797 }
2798
2799 /*
2800 * Test if the bit representing this inode (blkno) is set in the
2801 * suballocator.
2802 *
2803 * On success, 0 is returned and *res is 1 for SET; 0 otherwise.
2804 *
2805 * In the event of failure, a negative value is returned and *res is
2806 * meaningless.
2807 *
2808 * Callers must make sure to hold nfs_sync_lock to prevent
2809 * ocfs2_delete_inode() on another node from accessing the same
2810 * suballocator concurrently.
2811 */
ocfs2_test_inode_bit(struct ocfs2_super * osb,u64 blkno,int * res)2812 int ocfs2_test_inode_bit(struct ocfs2_super *osb, u64 blkno, int *res)
2813 {
2814 int status;
2815 u64 group_blkno = 0;
2816 u16 suballoc_bit = 0, suballoc_slot = 0;
2817 struct inode *inode_alloc_inode;
2818 struct buffer_head *alloc_bh = NULL;
2819
2820 trace_ocfs2_test_inode_bit((unsigned long long)blkno);
2821
2822 status = ocfs2_get_suballoc_slot_bit(osb, blkno, &suballoc_slot,
2823 &group_blkno, &suballoc_bit);
2824 if (status < 0) {
2825 mlog(ML_ERROR, "get alloc slot and bit failed %d\n", status);
2826 goto bail;
2827 }
2828
2829 if (suballoc_slot == (u16)OCFS2_INVALID_SLOT)
2830 inode_alloc_inode = ocfs2_get_system_file_inode(osb,
2831 GLOBAL_INODE_ALLOC_SYSTEM_INODE, suballoc_slot);
2832 else
2833 inode_alloc_inode = ocfs2_get_system_file_inode(osb,
2834 INODE_ALLOC_SYSTEM_INODE, suballoc_slot);
2835 if (!inode_alloc_inode) {
2836 /* the error code could be inaccurate, but we are not able to
2837 * get the correct one. */
2838 status = -EINVAL;
2839 mlog(ML_ERROR, "unable to get alloc inode in slot %u\n",
2840 (u32)suballoc_slot);
2841 goto bail;
2842 }
2843
2844 inode_lock(inode_alloc_inode);
2845 status = ocfs2_inode_lock(inode_alloc_inode, &alloc_bh, 0);
2846 if (status < 0) {
2847 inode_unlock(inode_alloc_inode);
2848 iput(inode_alloc_inode);
2849 mlog(ML_ERROR, "lock on alloc inode on slot %u failed %d\n",
2850 (u32)suballoc_slot, status);
2851 goto bail;
2852 }
2853
2854 status = ocfs2_test_suballoc_bit(osb, inode_alloc_inode, alloc_bh,
2855 group_blkno, blkno, suballoc_bit, res);
2856 if (status < 0)
2857 mlog(ML_ERROR, "test suballoc bit failed %d\n", status);
2858
2859 ocfs2_inode_unlock(inode_alloc_inode, 0);
2860 inode_unlock(inode_alloc_inode);
2861
2862 iput(inode_alloc_inode);
2863 brelse(alloc_bh);
2864 bail:
2865 if (status)
2866 mlog_errno(status);
2867 return status;
2868 }
2869