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ccd979bd MF |
1 | /* -*- mode: c; c-basic-offset: 8; -*- |
2 | * vim: noexpandtab sw=8 ts=8 sts=0: | |
3 | * | |
4 | * suballoc.c | |
5 | * | |
6 | * metadata alloc and free | |
7 | * Inspired by ext3 block groups. | |
8 | * | |
9 | * Copyright (C) 2002, 2004 Oracle. All rights reserved. | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or | |
12 | * modify it under the terms of the GNU General Public | |
13 | * License as published by the Free Software Foundation; either | |
14 | * version 2 of the License, or (at your option) any later version. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
19 | * General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public | |
22 | * License along with this program; if not, write to the | |
23 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
24 | * Boston, MA 021110-1307, USA. | |
25 | */ | |
26 | ||
27 | #include <linux/fs.h> | |
28 | #include <linux/types.h> | |
29 | #include <linux/slab.h> | |
30 | #include <linux/highmem.h> | |
31 | ||
32 | #define MLOG_MASK_PREFIX ML_DISK_ALLOC | |
33 | #include <cluster/masklog.h> | |
34 | ||
35 | #include "ocfs2.h" | |
36 | ||
37 | #include "alloc.h" | |
d6b32bbb | 38 | #include "blockcheck.h" |
ccd979bd MF |
39 | #include "dlmglue.h" |
40 | #include "inode.h" | |
41 | #include "journal.h" | |
42 | #include "localalloc.h" | |
43 | #include "suballoc.h" | |
44 | #include "super.h" | |
45 | #include "sysfile.h" | |
46 | #include "uptodate.h" | |
47 | ||
48 | #include "buffer_head_io.h" | |
49 | ||
ffda89a3 | 50 | #define NOT_ALLOC_NEW_GROUP 0 |
60ca81e8 TM |
51 | #define ALLOC_NEW_GROUP 0x1 |
52 | #define ALLOC_GROUPS_FROM_GLOBAL 0x2 | |
ffda89a3 | 53 | |
b89c5428 | 54 | #define OCFS2_MAX_TO_STEAL 1024 |
4d0ddb2c | 55 | |
ccd979bd MF |
56 | static inline void ocfs2_debug_bg(struct ocfs2_group_desc *bg); |
57 | static inline void ocfs2_debug_suballoc_inode(struct ocfs2_dinode *fe); | |
58 | static inline u16 ocfs2_find_victim_chain(struct ocfs2_chain_list *cl); | |
1fabe148 | 59 | static int ocfs2_block_group_fill(handle_t *handle, |
ccd979bd MF |
60 | struct inode *alloc_inode, |
61 | struct buffer_head *bg_bh, | |
62 | u64 group_blkno, | |
63 | u16 my_chain, | |
64 | struct ocfs2_chain_list *cl); | |
65 | static int ocfs2_block_group_alloc(struct ocfs2_super *osb, | |
66 | struct inode *alloc_inode, | |
1187c968 | 67 | struct buffer_head *bh, |
60ca81e8 | 68 | u64 max_block, |
feb473a6 | 69 | u64 *last_alloc_group, |
60ca81e8 | 70 | int flags); |
ccd979bd | 71 | |
ccd979bd MF |
72 | static int ocfs2_cluster_group_search(struct inode *inode, |
73 | struct buffer_head *group_bh, | |
74 | u32 bits_wanted, u32 min_bits, | |
1187c968 | 75 | u64 max_block, |
ccd979bd MF |
76 | u16 *bit_off, u16 *bits_found); |
77 | static int ocfs2_block_group_search(struct inode *inode, | |
78 | struct buffer_head *group_bh, | |
79 | u32 bits_wanted, u32 min_bits, | |
1187c968 | 80 | u64 max_block, |
ccd979bd | 81 | u16 *bit_off, u16 *bits_found); |
ccd979bd MF |
82 | static int ocfs2_claim_suballoc_bits(struct ocfs2_super *osb, |
83 | struct ocfs2_alloc_context *ac, | |
1fabe148 | 84 | handle_t *handle, |
ccd979bd MF |
85 | u32 bits_wanted, |
86 | u32 min_bits, | |
87 | u16 *bit_off, | |
88 | unsigned int *num_bits, | |
89 | u64 *bg_blkno); | |
90 | static int ocfs2_test_bg_bit_allocatable(struct buffer_head *bg_bh, | |
91 | int nr); | |
1fabe148 | 92 | static inline int ocfs2_block_group_set_bits(handle_t *handle, |
ccd979bd MF |
93 | struct inode *alloc_inode, |
94 | struct ocfs2_group_desc *bg, | |
95 | struct buffer_head *group_bh, | |
96 | unsigned int bit_off, | |
97 | unsigned int num_bits); | |
1fabe148 | 98 | static int ocfs2_relink_block_group(handle_t *handle, |
ccd979bd MF |
99 | struct inode *alloc_inode, |
100 | struct buffer_head *fe_bh, | |
101 | struct buffer_head *bg_bh, | |
102 | struct buffer_head *prev_bg_bh, | |
103 | u16 chain); | |
104 | static inline int ocfs2_block_group_reasonably_empty(struct ocfs2_group_desc *bg, | |
105 | u32 wanted); | |
ccd979bd MF |
106 | static inline u32 ocfs2_desc_bitmap_to_cluster_off(struct inode *inode, |
107 | u64 bg_blkno, | |
108 | u16 bg_bit_off); | |
ccd979bd MF |
109 | static inline void ocfs2_block_to_cluster_group(struct inode *inode, |
110 | u64 data_blkno, | |
111 | u64 *bg_blkno, | |
112 | u16 *bg_bit_off); | |
1187c968 JB |
113 | static int ocfs2_reserve_clusters_with_limit(struct ocfs2_super *osb, |
114 | u32 bits_wanted, u64 max_block, | |
60ca81e8 | 115 | int flags, |
1187c968 | 116 | struct ocfs2_alloc_context **ac); |
ccd979bd | 117 | |
9c7af40b | 118 | void ocfs2_free_ac_resource(struct ocfs2_alloc_context *ac) |
ccd979bd | 119 | { |
da5cbf2f MF |
120 | struct inode *inode = ac->ac_inode; |
121 | ||
122 | if (inode) { | |
123 | if (ac->ac_which != OCFS2_AC_USE_LOCAL) | |
e63aecb6 | 124 | ocfs2_inode_unlock(inode, 1); |
da5cbf2f MF |
125 | |
126 | mutex_unlock(&inode->i_mutex); | |
127 | ||
128 | iput(inode); | |
4d0ddb2c | 129 | ac->ac_inode = NULL; |
da5cbf2f | 130 | } |
a81cb88b MF |
131 | brelse(ac->ac_bh); |
132 | ac->ac_bh = NULL; | |
e3b4a97d | 133 | ac->ac_resv = NULL; |
4d0ddb2c TM |
134 | } |
135 | ||
136 | void ocfs2_free_alloc_context(struct ocfs2_alloc_context *ac) | |
137 | { | |
138 | ocfs2_free_ac_resource(ac); | |
ccd979bd MF |
139 | kfree(ac); |
140 | } | |
141 | ||
142 | static u32 ocfs2_bits_per_group(struct ocfs2_chain_list *cl) | |
143 | { | |
144 | return (u32)le16_to_cpu(cl->cl_cpg) * (u32)le16_to_cpu(cl->cl_bpc); | |
145 | } | |
146 | ||
57e3e797 JB |
147 | #define do_error(fmt, ...) \ |
148 | do{ \ | |
78c37eb0 | 149 | if (resize) \ |
57e3e797 JB |
150 | mlog(ML_ERROR, fmt "\n", ##__VA_ARGS__); \ |
151 | else \ | |
152 | ocfs2_error(sb, fmt, ##__VA_ARGS__); \ | |
153 | } while (0) | |
154 | ||
970e4936 JB |
155 | static int ocfs2_validate_gd_self(struct super_block *sb, |
156 | struct buffer_head *bh, | |
78c37eb0 | 157 | int resize) |
970e4936 JB |
158 | { |
159 | struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data; | |
160 | ||
7bf72ede | 161 | if (!OCFS2_IS_VALID_GROUP_DESC(gd)) { |
68f64d47 JB |
162 | do_error("Group descriptor #%llu has bad signature %.*s", |
163 | (unsigned long long)bh->b_blocknr, 7, | |
57e3e797 JB |
164 | gd->bg_signature); |
165 | return -EINVAL; | |
7bf72ede MF |
166 | } |
167 | ||
68f64d47 JB |
168 | if (le64_to_cpu(gd->bg_blkno) != bh->b_blocknr) { |
169 | do_error("Group descriptor #%llu has an invalid bg_blkno " | |
170 | "of %llu", | |
171 | (unsigned long long)bh->b_blocknr, | |
172 | (unsigned long long)le64_to_cpu(gd->bg_blkno)); | |
173 | return -EINVAL; | |
174 | } | |
175 | ||
176 | if (le32_to_cpu(gd->bg_generation) != OCFS2_SB(sb)->fs_generation) { | |
177 | do_error("Group descriptor #%llu has an invalid " | |
178 | "fs_generation of #%u", | |
179 | (unsigned long long)bh->b_blocknr, | |
180 | le32_to_cpu(gd->bg_generation)); | |
181 | return -EINVAL; | |
182 | } | |
183 | ||
970e4936 JB |
184 | if (le16_to_cpu(gd->bg_free_bits_count) > le16_to_cpu(gd->bg_bits)) { |
185 | do_error("Group descriptor #%llu has bit count %u but " | |
186 | "claims that %u are free", | |
187 | (unsigned long long)bh->b_blocknr, | |
188 | le16_to_cpu(gd->bg_bits), | |
189 | le16_to_cpu(gd->bg_free_bits_count)); | |
190 | return -EINVAL; | |
191 | } | |
192 | ||
193 | if (le16_to_cpu(gd->bg_bits) > (8 * le16_to_cpu(gd->bg_size))) { | |
194 | do_error("Group descriptor #%llu has bit count %u but " | |
195 | "max bitmap bits of %u", | |
196 | (unsigned long long)bh->b_blocknr, | |
197 | le16_to_cpu(gd->bg_bits), | |
198 | 8 * le16_to_cpu(gd->bg_size)); | |
199 | return -EINVAL; | |
200 | } | |
201 | ||
202 | return 0; | |
203 | } | |
204 | ||
205 | static int ocfs2_validate_gd_parent(struct super_block *sb, | |
206 | struct ocfs2_dinode *di, | |
207 | struct buffer_head *bh, | |
78c37eb0 | 208 | int resize) |
970e4936 JB |
209 | { |
210 | unsigned int max_bits; | |
211 | struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data; | |
212 | ||
7bf72ede | 213 | if (di->i_blkno != gd->bg_parent_dinode) { |
68f64d47 | 214 | do_error("Group descriptor #%llu has bad parent " |
57e3e797 | 215 | "pointer (%llu, expected %llu)", |
68f64d47 | 216 | (unsigned long long)bh->b_blocknr, |
57e3e797 JB |
217 | (unsigned long long)le64_to_cpu(gd->bg_parent_dinode), |
218 | (unsigned long long)le64_to_cpu(di->i_blkno)); | |
219 | return -EINVAL; | |
7bf72ede MF |
220 | } |
221 | ||
222 | max_bits = le16_to_cpu(di->id2.i_chain.cl_cpg) * le16_to_cpu(di->id2.i_chain.cl_bpc); | |
223 | if (le16_to_cpu(gd->bg_bits) > max_bits) { | |
68f64d47 JB |
224 | do_error("Group descriptor #%llu has bit count of %u", |
225 | (unsigned long long)bh->b_blocknr, | |
57e3e797 JB |
226 | le16_to_cpu(gd->bg_bits)); |
227 | return -EINVAL; | |
7bf72ede MF |
228 | } |
229 | ||
78c37eb0 TM |
230 | /* In resize, we may meet the case bg_chain == cl_next_free_rec. */ |
231 | if ((le16_to_cpu(gd->bg_chain) > | |
232 | le16_to_cpu(di->id2.i_chain.cl_next_free_rec)) || | |
233 | ((le16_to_cpu(gd->bg_chain) == | |
234 | le16_to_cpu(di->id2.i_chain.cl_next_free_rec)) && !resize)) { | |
68f64d47 JB |
235 | do_error("Group descriptor #%llu has bad chain %u", |
236 | (unsigned long long)bh->b_blocknr, | |
57e3e797 JB |
237 | le16_to_cpu(gd->bg_chain)); |
238 | return -EINVAL; | |
7bf72ede MF |
239 | } |
240 | ||
970e4936 JB |
241 | return 0; |
242 | } | |
7bf72ede | 243 | |
57e3e797 | 244 | #undef do_error |
7bf72ede | 245 | |
970e4936 JB |
246 | /* |
247 | * This version only prints errors. It does not fail the filesystem, and | |
248 | * exists only for resize. | |
249 | */ | |
250 | int ocfs2_check_group_descriptor(struct super_block *sb, | |
251 | struct ocfs2_dinode *di, | |
252 | struct buffer_head *bh) | |
253 | { | |
254 | int rc; | |
d6b32bbb JB |
255 | struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data; |
256 | ||
257 | BUG_ON(!buffer_uptodate(bh)); | |
970e4936 | 258 | |
d6b32bbb JB |
259 | /* |
260 | * If the ecc fails, we return the error but otherwise | |
261 | * leave the filesystem running. We know any error is | |
262 | * local to this block. | |
263 | */ | |
264 | rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &gd->bg_check); | |
13723d00 JB |
265 | if (rc) { |
266 | mlog(ML_ERROR, | |
267 | "Checksum failed for group descriptor %llu\n", | |
268 | (unsigned long long)bh->b_blocknr); | |
269 | } else | |
d6b32bbb | 270 | rc = ocfs2_validate_gd_self(sb, bh, 1); |
970e4936 JB |
271 | if (!rc) |
272 | rc = ocfs2_validate_gd_parent(sb, di, bh, 1); | |
273 | ||
274 | return rc; | |
275 | } | |
276 | ||
277 | static int ocfs2_validate_group_descriptor(struct super_block *sb, | |
278 | struct buffer_head *bh) | |
279 | { | |
d6b32bbb JB |
280 | int rc; |
281 | struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data; | |
282 | ||
970e4936 JB |
283 | mlog(0, "Validating group descriptor %llu\n", |
284 | (unsigned long long)bh->b_blocknr); | |
285 | ||
d6b32bbb JB |
286 | BUG_ON(!buffer_uptodate(bh)); |
287 | ||
288 | /* | |
289 | * If the ecc fails, we return the error but otherwise | |
290 | * leave the filesystem running. We know any error is | |
291 | * local to this block. | |
292 | */ | |
293 | rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &gd->bg_check); | |
294 | if (rc) | |
295 | return rc; | |
296 | ||
297 | /* | |
298 | * Errors after here are fatal. | |
299 | */ | |
300 | ||
970e4936 | 301 | return ocfs2_validate_gd_self(sb, bh, 0); |
7bf72ede MF |
302 | } |
303 | ||
68f64d47 JB |
304 | int ocfs2_read_group_descriptor(struct inode *inode, struct ocfs2_dinode *di, |
305 | u64 gd_blkno, struct buffer_head **bh) | |
306 | { | |
307 | int rc; | |
308 | struct buffer_head *tmp = *bh; | |
309 | ||
8cb471e8 | 310 | rc = ocfs2_read_block(INODE_CACHE(inode), gd_blkno, &tmp, |
970e4936 | 311 | ocfs2_validate_group_descriptor); |
68f64d47 JB |
312 | if (rc) |
313 | goto out; | |
314 | ||
970e4936 | 315 | rc = ocfs2_validate_gd_parent(inode->i_sb, di, tmp, 0); |
68f64d47 JB |
316 | if (rc) { |
317 | brelse(tmp); | |
318 | goto out; | |
319 | } | |
320 | ||
321 | /* If ocfs2_read_block() got us a new bh, pass it up. */ | |
322 | if (!*bh) | |
323 | *bh = tmp; | |
324 | ||
325 | out: | |
326 | return rc; | |
327 | } | |
328 | ||
1fabe148 | 329 | static int ocfs2_block_group_fill(handle_t *handle, |
ccd979bd MF |
330 | struct inode *alloc_inode, |
331 | struct buffer_head *bg_bh, | |
332 | u64 group_blkno, | |
333 | u16 my_chain, | |
334 | struct ocfs2_chain_list *cl) | |
335 | { | |
336 | int status = 0; | |
337 | struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data; | |
338 | struct super_block * sb = alloc_inode->i_sb; | |
339 | ||
340 | mlog_entry_void(); | |
341 | ||
342 | if (((unsigned long long) bg_bh->b_blocknr) != group_blkno) { | |
b0697053 MF |
343 | ocfs2_error(alloc_inode->i_sb, "group block (%llu) != " |
344 | "b_blocknr (%llu)", | |
345 | (unsigned long long)group_blkno, | |
ccd979bd MF |
346 | (unsigned long long) bg_bh->b_blocknr); |
347 | status = -EIO; | |
348 | goto bail; | |
349 | } | |
350 | ||
13723d00 | 351 | status = ocfs2_journal_access_gd(handle, |
0cf2f763 | 352 | INODE_CACHE(alloc_inode), |
13723d00 JB |
353 | bg_bh, |
354 | OCFS2_JOURNAL_ACCESS_CREATE); | |
ccd979bd MF |
355 | if (status < 0) { |
356 | mlog_errno(status); | |
357 | goto bail; | |
358 | } | |
359 | ||
360 | memset(bg, 0, sb->s_blocksize); | |
361 | strcpy(bg->bg_signature, OCFS2_GROUP_DESC_SIGNATURE); | |
362 | bg->bg_generation = cpu_to_le32(OCFS2_SB(sb)->fs_generation); | |
363 | bg->bg_size = cpu_to_le16(ocfs2_group_bitmap_size(sb)); | |
364 | bg->bg_bits = cpu_to_le16(ocfs2_bits_per_group(cl)); | |
365 | bg->bg_chain = cpu_to_le16(my_chain); | |
366 | bg->bg_next_group = cl->cl_recs[my_chain].c_blkno; | |
367 | bg->bg_parent_dinode = cpu_to_le64(OCFS2_I(alloc_inode)->ip_blkno); | |
368 | bg->bg_blkno = cpu_to_le64(group_blkno); | |
369 | /* set the 1st bit in the bitmap to account for the descriptor block */ | |
370 | ocfs2_set_bit(0, (unsigned long *)bg->bg_bitmap); | |
371 | bg->bg_free_bits_count = cpu_to_le16(le16_to_cpu(bg->bg_bits) - 1); | |
372 | ||
ec20cec7 | 373 | ocfs2_journal_dirty(handle, bg_bh); |
ccd979bd MF |
374 | |
375 | /* There is no need to zero out or otherwise initialize the | |
376 | * other blocks in a group - All valid FS metadata in a block | |
377 | * group stores the superblock fs_generation value at | |
378 | * allocation time. */ | |
379 | ||
380 | bail: | |
381 | mlog_exit(status); | |
382 | return status; | |
383 | } | |
384 | ||
385 | static inline u16 ocfs2_find_smallest_chain(struct ocfs2_chain_list *cl) | |
386 | { | |
387 | u16 curr, best; | |
388 | ||
389 | best = curr = 0; | |
390 | while (curr < le16_to_cpu(cl->cl_count)) { | |
391 | if (le32_to_cpu(cl->cl_recs[best].c_total) > | |
392 | le32_to_cpu(cl->cl_recs[curr].c_total)) | |
393 | best = curr; | |
394 | curr++; | |
395 | } | |
396 | return best; | |
397 | } | |
398 | ||
399 | /* | |
400 | * We expect the block group allocator to already be locked. | |
401 | */ | |
402 | static int ocfs2_block_group_alloc(struct ocfs2_super *osb, | |
403 | struct inode *alloc_inode, | |
1187c968 | 404 | struct buffer_head *bh, |
60ca81e8 | 405 | u64 max_block, |
feb473a6 | 406 | u64 *last_alloc_group, |
60ca81e8 | 407 | int flags) |
ccd979bd MF |
408 | { |
409 | int status, credits; | |
410 | struct ocfs2_dinode *fe = (struct ocfs2_dinode *) bh->b_data; | |
411 | struct ocfs2_chain_list *cl; | |
412 | struct ocfs2_alloc_context *ac = NULL; | |
1fabe148 | 413 | handle_t *handle = NULL; |
ccd979bd MF |
414 | u32 bit_off, num_bits; |
415 | u16 alloc_rec; | |
416 | u64 bg_blkno; | |
417 | struct buffer_head *bg_bh = NULL; | |
418 | struct ocfs2_group_desc *bg; | |
419 | ||
420 | BUG_ON(ocfs2_is_cluster_bitmap(alloc_inode)); | |
421 | ||
422 | mlog_entry_void(); | |
423 | ||
ccd979bd | 424 | cl = &fe->id2.i_chain; |
1187c968 JB |
425 | status = ocfs2_reserve_clusters_with_limit(osb, |
426 | le16_to_cpu(cl->cl_cpg), | |
60ca81e8 | 427 | max_block, flags, &ac); |
ccd979bd MF |
428 | if (status < 0) { |
429 | if (status != -ENOSPC) | |
430 | mlog_errno(status); | |
431 | goto bail; | |
432 | } | |
433 | ||
434 | credits = ocfs2_calc_group_alloc_credits(osb->sb, | |
435 | le16_to_cpu(cl->cl_cpg)); | |
65eff9cc | 436 | handle = ocfs2_start_trans(osb, credits); |
ccd979bd MF |
437 | if (IS_ERR(handle)) { |
438 | status = PTR_ERR(handle); | |
439 | handle = NULL; | |
440 | mlog_errno(status); | |
441 | goto bail; | |
442 | } | |
443 | ||
feb473a6 TM |
444 | if (last_alloc_group && *last_alloc_group != 0) { |
445 | mlog(0, "use old allocation group %llu for block group alloc\n", | |
446 | (unsigned long long)*last_alloc_group); | |
447 | ac->ac_last_group = *last_alloc_group; | |
448 | } | |
ccd979bd MF |
449 | status = ocfs2_claim_clusters(osb, |
450 | handle, | |
451 | ac, | |
452 | le16_to_cpu(cl->cl_cpg), | |
453 | &bit_off, | |
454 | &num_bits); | |
455 | if (status < 0) { | |
456 | if (status != -ENOSPC) | |
457 | mlog_errno(status); | |
458 | goto bail; | |
459 | } | |
460 | ||
461 | alloc_rec = ocfs2_find_smallest_chain(cl); | |
462 | ||
463 | /* setup the group */ | |
464 | bg_blkno = ocfs2_clusters_to_blocks(osb->sb, bit_off); | |
b0697053 MF |
465 | mlog(0, "new descriptor, record %u, at block %llu\n", |
466 | alloc_rec, (unsigned long long)bg_blkno); | |
ccd979bd MF |
467 | |
468 | bg_bh = sb_getblk(osb->sb, bg_blkno); | |
469 | if (!bg_bh) { | |
470 | status = -EIO; | |
471 | mlog_errno(status); | |
472 | goto bail; | |
473 | } | |
8cb471e8 | 474 | ocfs2_set_new_buffer_uptodate(INODE_CACHE(alloc_inode), bg_bh); |
ccd979bd MF |
475 | |
476 | status = ocfs2_block_group_fill(handle, | |
477 | alloc_inode, | |
478 | bg_bh, | |
479 | bg_blkno, | |
480 | alloc_rec, | |
481 | cl); | |
482 | if (status < 0) { | |
483 | mlog_errno(status); | |
484 | goto bail; | |
485 | } | |
486 | ||
487 | bg = (struct ocfs2_group_desc *) bg_bh->b_data; | |
488 | ||
0cf2f763 | 489 | status = ocfs2_journal_access_di(handle, INODE_CACHE(alloc_inode), |
13723d00 | 490 | bh, OCFS2_JOURNAL_ACCESS_WRITE); |
ccd979bd MF |
491 | if (status < 0) { |
492 | mlog_errno(status); | |
493 | goto bail; | |
494 | } | |
495 | ||
496 | le32_add_cpu(&cl->cl_recs[alloc_rec].c_free, | |
497 | le16_to_cpu(bg->bg_free_bits_count)); | |
498 | le32_add_cpu(&cl->cl_recs[alloc_rec].c_total, le16_to_cpu(bg->bg_bits)); | |
499 | cl->cl_recs[alloc_rec].c_blkno = cpu_to_le64(bg_blkno); | |
500 | if (le16_to_cpu(cl->cl_next_free_rec) < le16_to_cpu(cl->cl_count)) | |
501 | le16_add_cpu(&cl->cl_next_free_rec, 1); | |
502 | ||
503 | le32_add_cpu(&fe->id1.bitmap1.i_used, le16_to_cpu(bg->bg_bits) - | |
504 | le16_to_cpu(bg->bg_free_bits_count)); | |
505 | le32_add_cpu(&fe->id1.bitmap1.i_total, le16_to_cpu(bg->bg_bits)); | |
506 | le32_add_cpu(&fe->i_clusters, le16_to_cpu(cl->cl_cpg)); | |
507 | ||
ec20cec7 | 508 | ocfs2_journal_dirty(handle, bh); |
ccd979bd MF |
509 | |
510 | spin_lock(&OCFS2_I(alloc_inode)->ip_lock); | |
511 | OCFS2_I(alloc_inode)->ip_clusters = le32_to_cpu(fe->i_clusters); | |
512 | fe->i_size = cpu_to_le64(ocfs2_clusters_to_bytes(alloc_inode->i_sb, | |
513 | le32_to_cpu(fe->i_clusters))); | |
514 | spin_unlock(&OCFS2_I(alloc_inode)->ip_lock); | |
515 | i_size_write(alloc_inode, le64_to_cpu(fe->i_size)); | |
8110b073 | 516 | alloc_inode->i_blocks = ocfs2_inode_sector_count(alloc_inode); |
ccd979bd MF |
517 | |
518 | status = 0; | |
feb473a6 TM |
519 | |
520 | /* save the new last alloc group so that the caller can cache it. */ | |
521 | if (last_alloc_group) | |
522 | *last_alloc_group = ac->ac_last_group; | |
523 | ||
ccd979bd MF |
524 | bail: |
525 | if (handle) | |
02dc1af4 | 526 | ocfs2_commit_trans(osb, handle); |
ccd979bd MF |
527 | |
528 | if (ac) | |
529 | ocfs2_free_alloc_context(ac); | |
530 | ||
a81cb88b | 531 | brelse(bg_bh); |
ccd979bd MF |
532 | |
533 | mlog_exit(status); | |
534 | return status; | |
535 | } | |
536 | ||
537 | static int ocfs2_reserve_suballoc_bits(struct ocfs2_super *osb, | |
da5cbf2f MF |
538 | struct ocfs2_alloc_context *ac, |
539 | int type, | |
ffda89a3 | 540 | u32 slot, |
feb473a6 | 541 | u64 *last_alloc_group, |
60ca81e8 | 542 | int flags) |
ccd979bd MF |
543 | { |
544 | int status; | |
545 | u32 bits_wanted = ac->ac_bits_wanted; | |
da5cbf2f | 546 | struct inode *alloc_inode; |
ccd979bd | 547 | struct buffer_head *bh = NULL; |
ccd979bd MF |
548 | struct ocfs2_dinode *fe; |
549 | u32 free_bits; | |
550 | ||
551 | mlog_entry_void(); | |
552 | ||
da5cbf2f MF |
553 | alloc_inode = ocfs2_get_system_file_inode(osb, type, slot); |
554 | if (!alloc_inode) { | |
555 | mlog_errno(-EINVAL); | |
556 | return -EINVAL; | |
557 | } | |
ccd979bd | 558 | |
da5cbf2f MF |
559 | mutex_lock(&alloc_inode->i_mutex); |
560 | ||
e63aecb6 | 561 | status = ocfs2_inode_lock(alloc_inode, &bh, 1); |
ccd979bd | 562 | if (status < 0) { |
da5cbf2f MF |
563 | mutex_unlock(&alloc_inode->i_mutex); |
564 | iput(alloc_inode); | |
565 | ||
ccd979bd | 566 | mlog_errno(status); |
da5cbf2f | 567 | return status; |
ccd979bd MF |
568 | } |
569 | ||
da5cbf2f | 570 | ac->ac_inode = alloc_inode; |
a4a48911 | 571 | ac->ac_alloc_slot = slot; |
da5cbf2f | 572 | |
ccd979bd | 573 | fe = (struct ocfs2_dinode *) bh->b_data; |
10995aa2 JB |
574 | |
575 | /* The bh was validated by the inode read inside | |
576 | * ocfs2_inode_lock(). Any corruption is a code bug. */ | |
577 | BUG_ON(!OCFS2_IS_VALID_DINODE(fe)); | |
578 | ||
ccd979bd | 579 | if (!(fe->i_flags & cpu_to_le32(OCFS2_CHAIN_FL))) { |
b0697053 MF |
580 | ocfs2_error(alloc_inode->i_sb, "Invalid chain allocator %llu", |
581 | (unsigned long long)le64_to_cpu(fe->i_blkno)); | |
ccd979bd MF |
582 | status = -EIO; |
583 | goto bail; | |
584 | } | |
585 | ||
586 | free_bits = le32_to_cpu(fe->id1.bitmap1.i_total) - | |
587 | le32_to_cpu(fe->id1.bitmap1.i_used); | |
588 | ||
589 | if (bits_wanted > free_bits) { | |
590 | /* cluster bitmap never grows */ | |
591 | if (ocfs2_is_cluster_bitmap(alloc_inode)) { | |
592 | mlog(0, "Disk Full: wanted=%u, free_bits=%u\n", | |
593 | bits_wanted, free_bits); | |
594 | status = -ENOSPC; | |
595 | goto bail; | |
596 | } | |
597 | ||
60ca81e8 | 598 | if (!(flags & ALLOC_NEW_GROUP)) { |
ffda89a3 TM |
599 | mlog(0, "Alloc File %u Full: wanted=%u, free_bits=%u, " |
600 | "and we don't alloc a new group for it.\n", | |
601 | slot, bits_wanted, free_bits); | |
602 | status = -ENOSPC; | |
603 | goto bail; | |
604 | } | |
605 | ||
1187c968 | 606 | status = ocfs2_block_group_alloc(osb, alloc_inode, bh, |
feb473a6 TM |
607 | ac->ac_max_block, |
608 | last_alloc_group, flags); | |
ccd979bd MF |
609 | if (status < 0) { |
610 | if (status != -ENOSPC) | |
611 | mlog_errno(status); | |
612 | goto bail; | |
613 | } | |
614 | atomic_inc(&osb->alloc_stats.bg_extends); | |
615 | ||
616 | /* You should never ask for this much metadata */ | |
617 | BUG_ON(bits_wanted > | |
618 | (le32_to_cpu(fe->id1.bitmap1.i_total) | |
619 | - le32_to_cpu(fe->id1.bitmap1.i_used))); | |
620 | } | |
621 | ||
622 | get_bh(bh); | |
623 | ac->ac_bh = bh; | |
624 | bail: | |
a81cb88b | 625 | brelse(bh); |
ccd979bd MF |
626 | |
627 | mlog_exit(status); | |
628 | return status; | |
629 | } | |
630 | ||
b89c5428 TY |
631 | static void ocfs2_init_inode_steal_slot(struct ocfs2_super *osb) |
632 | { | |
633 | spin_lock(&osb->osb_lock); | |
634 | osb->s_inode_steal_slot = OCFS2_INVALID_SLOT; | |
635 | spin_unlock(&osb->osb_lock); | |
636 | atomic_set(&osb->s_num_inodes_stolen, 0); | |
637 | } | |
638 | ||
639 | static void ocfs2_init_meta_steal_slot(struct ocfs2_super *osb) | |
640 | { | |
641 | spin_lock(&osb->osb_lock); | |
642 | osb->s_meta_steal_slot = OCFS2_INVALID_SLOT; | |
643 | spin_unlock(&osb->osb_lock); | |
644 | atomic_set(&osb->s_num_meta_stolen, 0); | |
645 | } | |
646 | ||
647 | void ocfs2_init_steal_slots(struct ocfs2_super *osb) | |
648 | { | |
649 | ocfs2_init_inode_steal_slot(osb); | |
650 | ocfs2_init_meta_steal_slot(osb); | |
651 | } | |
652 | ||
653 | static void __ocfs2_set_steal_slot(struct ocfs2_super *osb, int slot, int type) | |
654 | { | |
655 | spin_lock(&osb->osb_lock); | |
656 | if (type == INODE_ALLOC_SYSTEM_INODE) | |
657 | osb->s_inode_steal_slot = slot; | |
658 | else if (type == EXTENT_ALLOC_SYSTEM_INODE) | |
659 | osb->s_meta_steal_slot = slot; | |
660 | spin_unlock(&osb->osb_lock); | |
661 | } | |
662 | ||
663 | static int __ocfs2_get_steal_slot(struct ocfs2_super *osb, int type) | |
664 | { | |
665 | int slot = OCFS2_INVALID_SLOT; | |
666 | ||
667 | spin_lock(&osb->osb_lock); | |
668 | if (type == INODE_ALLOC_SYSTEM_INODE) | |
669 | slot = osb->s_inode_steal_slot; | |
670 | else if (type == EXTENT_ALLOC_SYSTEM_INODE) | |
671 | slot = osb->s_meta_steal_slot; | |
672 | spin_unlock(&osb->osb_lock); | |
673 | ||
674 | return slot; | |
675 | } | |
676 | ||
677 | static int ocfs2_get_inode_steal_slot(struct ocfs2_super *osb) | |
678 | { | |
679 | return __ocfs2_get_steal_slot(osb, INODE_ALLOC_SYSTEM_INODE); | |
680 | } | |
681 | ||
682 | static int ocfs2_get_meta_steal_slot(struct ocfs2_super *osb) | |
683 | { | |
684 | return __ocfs2_get_steal_slot(osb, EXTENT_ALLOC_SYSTEM_INODE); | |
685 | } | |
686 | ||
687 | static int ocfs2_steal_resource(struct ocfs2_super *osb, | |
688 | struct ocfs2_alloc_context *ac, | |
689 | int type) | |
690 | { | |
691 | int i, status = -ENOSPC; | |
692 | int slot = __ocfs2_get_steal_slot(osb, type); | |
693 | ||
694 | /* Start to steal resource from the first slot after ours. */ | |
695 | if (slot == OCFS2_INVALID_SLOT) | |
696 | slot = osb->slot_num + 1; | |
697 | ||
698 | for (i = 0; i < osb->max_slots; i++, slot++) { | |
699 | if (slot == osb->max_slots) | |
700 | slot = 0; | |
701 | ||
702 | if (slot == osb->slot_num) | |
703 | continue; | |
704 | ||
705 | status = ocfs2_reserve_suballoc_bits(osb, ac, | |
706 | type, | |
707 | (u32)slot, NULL, | |
708 | NOT_ALLOC_NEW_GROUP); | |
709 | if (status >= 0) { | |
710 | __ocfs2_set_steal_slot(osb, slot, type); | |
711 | break; | |
712 | } | |
713 | ||
714 | ocfs2_free_ac_resource(ac); | |
715 | } | |
716 | ||
717 | return status; | |
718 | } | |
719 | ||
720 | static int ocfs2_steal_inode(struct ocfs2_super *osb, | |
721 | struct ocfs2_alloc_context *ac) | |
722 | { | |
723 | return ocfs2_steal_resource(osb, ac, INODE_ALLOC_SYSTEM_INODE); | |
724 | } | |
725 | ||
726 | static int ocfs2_steal_meta(struct ocfs2_super *osb, | |
727 | struct ocfs2_alloc_context *ac) | |
728 | { | |
729 | return ocfs2_steal_resource(osb, ac, EXTENT_ALLOC_SYSTEM_INODE); | |
730 | } | |
731 | ||
cf1d6c76 TY |
732 | int ocfs2_reserve_new_metadata_blocks(struct ocfs2_super *osb, |
733 | int blocks, | |
734 | struct ocfs2_alloc_context **ac) | |
ccd979bd MF |
735 | { |
736 | int status; | |
b89c5428 | 737 | int slot = ocfs2_get_meta_steal_slot(osb); |
ccd979bd | 738 | |
cd861280 | 739 | *ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL); |
ccd979bd MF |
740 | if (!(*ac)) { |
741 | status = -ENOMEM; | |
742 | mlog_errno(status); | |
743 | goto bail; | |
744 | } | |
745 | ||
cf1d6c76 | 746 | (*ac)->ac_bits_wanted = blocks; |
ccd979bd | 747 | (*ac)->ac_which = OCFS2_AC_USE_META; |
ccd979bd MF |
748 | (*ac)->ac_group_search = ocfs2_block_group_search; |
749 | ||
b89c5428 TY |
750 | if (slot != OCFS2_INVALID_SLOT && |
751 | atomic_read(&osb->s_num_meta_stolen) < OCFS2_MAX_TO_STEAL) | |
752 | goto extent_steal; | |
753 | ||
754 | atomic_set(&osb->s_num_meta_stolen, 0); | |
da5cbf2f | 755 | status = ocfs2_reserve_suballoc_bits(osb, (*ac), |
ffda89a3 | 756 | EXTENT_ALLOC_SYSTEM_INODE, |
b89c5428 TY |
757 | (u32)osb->slot_num, NULL, |
758 | ALLOC_NEW_GROUP); | |
759 | ||
760 | ||
761 | if (status >= 0) { | |
762 | status = 0; | |
763 | if (slot != OCFS2_INVALID_SLOT) | |
764 | ocfs2_init_meta_steal_slot(osb); | |
765 | goto bail; | |
766 | } else if (status < 0 && status != -ENOSPC) { | |
767 | mlog_errno(status); | |
768 | goto bail; | |
769 | } | |
770 | ||
771 | ocfs2_free_ac_resource(*ac); | |
772 | ||
773 | extent_steal: | |
774 | status = ocfs2_steal_meta(osb, *ac); | |
775 | atomic_inc(&osb->s_num_meta_stolen); | |
ccd979bd MF |
776 | if (status < 0) { |
777 | if (status != -ENOSPC) | |
778 | mlog_errno(status); | |
779 | goto bail; | |
780 | } | |
781 | ||
782 | status = 0; | |
783 | bail: | |
784 | if ((status < 0) && *ac) { | |
785 | ocfs2_free_alloc_context(*ac); | |
786 | *ac = NULL; | |
787 | } | |
788 | ||
ccd979bd MF |
789 | mlog_exit(status); |
790 | return status; | |
791 | } | |
792 | ||
cf1d6c76 TY |
793 | int ocfs2_reserve_new_metadata(struct ocfs2_super *osb, |
794 | struct ocfs2_extent_list *root_el, | |
795 | struct ocfs2_alloc_context **ac) | |
796 | { | |
797 | return ocfs2_reserve_new_metadata_blocks(osb, | |
798 | ocfs2_extend_meta_needed(root_el), | |
799 | ac); | |
800 | } | |
801 | ||
ccd979bd | 802 | int ocfs2_reserve_new_inode(struct ocfs2_super *osb, |
ccd979bd MF |
803 | struct ocfs2_alloc_context **ac) |
804 | { | |
805 | int status; | |
b89c5428 | 806 | int slot = ocfs2_get_inode_steal_slot(osb); |
feb473a6 | 807 | u64 alloc_group; |
ccd979bd | 808 | |
cd861280 | 809 | *ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL); |
ccd979bd MF |
810 | if (!(*ac)) { |
811 | status = -ENOMEM; | |
812 | mlog_errno(status); | |
813 | goto bail; | |
814 | } | |
815 | ||
816 | (*ac)->ac_bits_wanted = 1; | |
ccd979bd MF |
817 | (*ac)->ac_which = OCFS2_AC_USE_INODE; |
818 | ||
ccd979bd MF |
819 | (*ac)->ac_group_search = ocfs2_block_group_search; |
820 | ||
1187c968 JB |
821 | /* |
822 | * stat(2) can't handle i_ino > 32bits, so we tell the | |
823 | * lower levels not to allocate us a block group past that | |
12462f1d | 824 | * limit. The 'inode64' mount option avoids this behavior. |
1187c968 | 825 | */ |
12462f1d JB |
826 | if (!(osb->s_mount_opt & OCFS2_MOUNT_INODE64)) |
827 | (*ac)->ac_max_block = (u32)~0U; | |
1187c968 | 828 | |
4d0ddb2c TM |
829 | /* |
830 | * slot is set when we successfully steal inode from other nodes. | |
831 | * It is reset in 3 places: | |
832 | * 1. when we flush the truncate log | |
833 | * 2. when we complete local alloc recovery. | |
834 | * 3. when we successfully allocate from our own slot. | |
835 | * After it is set, we will go on stealing inodes until we find the | |
836 | * need to check our slots to see whether there is some space for us. | |
837 | */ | |
838 | if (slot != OCFS2_INVALID_SLOT && | |
b89c5428 | 839 | atomic_read(&osb->s_num_inodes_stolen) < OCFS2_MAX_TO_STEAL) |
4d0ddb2c TM |
840 | goto inode_steal; |
841 | ||
842 | atomic_set(&osb->s_num_inodes_stolen, 0); | |
feb473a6 | 843 | alloc_group = osb->osb_inode_alloc_group; |
da5cbf2f MF |
844 | status = ocfs2_reserve_suballoc_bits(osb, *ac, |
845 | INODE_ALLOC_SYSTEM_INODE, | |
b89c5428 | 846 | (u32)osb->slot_num, |
feb473a6 | 847 | &alloc_group, |
60ca81e8 TM |
848 | ALLOC_NEW_GROUP | |
849 | ALLOC_GROUPS_FROM_GLOBAL); | |
4d0ddb2c TM |
850 | if (status >= 0) { |
851 | status = 0; | |
852 | ||
feb473a6 TM |
853 | spin_lock(&osb->osb_lock); |
854 | osb->osb_inode_alloc_group = alloc_group; | |
855 | spin_unlock(&osb->osb_lock); | |
856 | mlog(0, "after reservation, new allocation group is " | |
857 | "%llu\n", (unsigned long long)alloc_group); | |
858 | ||
4d0ddb2c TM |
859 | /* |
860 | * Some inodes must be freed by us, so try to allocate | |
861 | * from our own next time. | |
862 | */ | |
863 | if (slot != OCFS2_INVALID_SLOT) | |
864 | ocfs2_init_inode_steal_slot(osb); | |
865 | goto bail; | |
866 | } else if (status < 0 && status != -ENOSPC) { | |
867 | mlog_errno(status); | |
868 | goto bail; | |
869 | } | |
870 | ||
871 | ocfs2_free_ac_resource(*ac); | |
872 | ||
873 | inode_steal: | |
b89c5428 | 874 | status = ocfs2_steal_inode(osb, *ac); |
4d0ddb2c | 875 | atomic_inc(&osb->s_num_inodes_stolen); |
ccd979bd MF |
876 | if (status < 0) { |
877 | if (status != -ENOSPC) | |
878 | mlog_errno(status); | |
879 | goto bail; | |
880 | } | |
881 | ||
882 | status = 0; | |
883 | bail: | |
884 | if ((status < 0) && *ac) { | |
885 | ocfs2_free_alloc_context(*ac); | |
886 | *ac = NULL; | |
887 | } | |
888 | ||
ccd979bd MF |
889 | mlog_exit(status); |
890 | return status; | |
891 | } | |
892 | ||
893 | /* local alloc code has to do the same thing, so rather than do this | |
894 | * twice.. */ | |
895 | int ocfs2_reserve_cluster_bitmap_bits(struct ocfs2_super *osb, | |
896 | struct ocfs2_alloc_context *ac) | |
897 | { | |
898 | int status; | |
899 | ||
ccd979bd MF |
900 | ac->ac_which = OCFS2_AC_USE_MAIN; |
901 | ac->ac_group_search = ocfs2_cluster_group_search; | |
902 | ||
da5cbf2f MF |
903 | status = ocfs2_reserve_suballoc_bits(osb, ac, |
904 | GLOBAL_BITMAP_SYSTEM_INODE, | |
feb473a6 | 905 | OCFS2_INVALID_SLOT, NULL, |
ffda89a3 | 906 | ALLOC_NEW_GROUP); |
da5cbf2f | 907 | if (status < 0 && status != -ENOSPC) { |
ccd979bd | 908 | mlog_errno(status); |
da5cbf2f MF |
909 | goto bail; |
910 | } | |
911 | ||
ccd979bd MF |
912 | bail: |
913 | return status; | |
914 | } | |
915 | ||
916 | /* Callers don't need to care which bitmap (local alloc or main) to | |
917 | * use so we figure it out for them, but unfortunately this clutters | |
918 | * things a bit. */ | |
1187c968 JB |
919 | static int ocfs2_reserve_clusters_with_limit(struct ocfs2_super *osb, |
920 | u32 bits_wanted, u64 max_block, | |
60ca81e8 | 921 | int flags, |
1187c968 | 922 | struct ocfs2_alloc_context **ac) |
ccd979bd MF |
923 | { |
924 | int status; | |
925 | ||
926 | mlog_entry_void(); | |
927 | ||
cd861280 | 928 | *ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL); |
ccd979bd MF |
929 | if (!(*ac)) { |
930 | status = -ENOMEM; | |
931 | mlog_errno(status); | |
932 | goto bail; | |
933 | } | |
934 | ||
935 | (*ac)->ac_bits_wanted = bits_wanted; | |
1187c968 | 936 | (*ac)->ac_max_block = max_block; |
ccd979bd MF |
937 | |
938 | status = -ENOSPC; | |
60ca81e8 TM |
939 | if (!(flags & ALLOC_GROUPS_FROM_GLOBAL) && |
940 | ocfs2_alloc_should_use_local(osb, bits_wanted)) { | |
ccd979bd | 941 | status = ocfs2_reserve_local_alloc_bits(osb, |
ccd979bd MF |
942 | bits_wanted, |
943 | *ac); | |
1187c968 JB |
944 | if (status == -EFBIG) { |
945 | /* The local alloc window is outside ac_max_block. | |
946 | * use the main bitmap. */ | |
947 | status = -ENOSPC; | |
948 | } else if ((status < 0) && (status != -ENOSPC)) { | |
ccd979bd MF |
949 | mlog_errno(status); |
950 | goto bail; | |
ccd979bd MF |
951 | } |
952 | } | |
953 | ||
954 | if (status == -ENOSPC) { | |
955 | status = ocfs2_reserve_cluster_bitmap_bits(osb, *ac); | |
956 | if (status < 0) { | |
957 | if (status != -ENOSPC) | |
958 | mlog_errno(status); | |
959 | goto bail; | |
960 | } | |
961 | } | |
962 | ||
963 | status = 0; | |
964 | bail: | |
965 | if ((status < 0) && *ac) { | |
966 | ocfs2_free_alloc_context(*ac); | |
967 | *ac = NULL; | |
968 | } | |
969 | ||
970 | mlog_exit(status); | |
971 | return status; | |
972 | } | |
973 | ||
1187c968 JB |
974 | int ocfs2_reserve_clusters(struct ocfs2_super *osb, |
975 | u32 bits_wanted, | |
976 | struct ocfs2_alloc_context **ac) | |
977 | { | |
60ca81e8 TM |
978 | return ocfs2_reserve_clusters_with_limit(osb, bits_wanted, 0, |
979 | ALLOC_NEW_GROUP, ac); | |
1187c968 JB |
980 | } |
981 | ||
ccd979bd MF |
982 | /* |
983 | * More or less lifted from ext3. I'll leave their description below: | |
984 | * | |
985 | * "For ext3 allocations, we must not reuse any blocks which are | |
986 | * allocated in the bitmap buffer's "last committed data" copy. This | |
987 | * prevents deletes from freeing up the page for reuse until we have | |
988 | * committed the delete transaction. | |
989 | * | |
990 | * If we didn't do this, then deleting something and reallocating it as | |
991 | * data would allow the old block to be overwritten before the | |
992 | * transaction committed (because we force data to disk before commit). | |
993 | * This would lead to corruption if we crashed between overwriting the | |
994 | * data and committing the delete. | |
995 | * | |
996 | * @@@ We may want to make this allocation behaviour conditional on | |
997 | * data-writes at some point, and disable it for metadata allocations or | |
998 | * sync-data inodes." | |
999 | * | |
1000 | * Note: OCFS2 already does this differently for metadata vs data | |
c78bad11 | 1001 | * allocations, as those bitmaps are separate and undo access is never |
ccd979bd MF |
1002 | * called on a metadata group descriptor. |
1003 | */ | |
1004 | static int ocfs2_test_bg_bit_allocatable(struct buffer_head *bg_bh, | |
1005 | int nr) | |
1006 | { | |
1007 | struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data; | |
94e41ecf | 1008 | int ret; |
ccd979bd MF |
1009 | |
1010 | if (ocfs2_test_bit(nr, (unsigned long *)bg->bg_bitmap)) | |
1011 | return 0; | |
94e41ecf SM |
1012 | |
1013 | if (!buffer_jbd(bg_bh)) | |
ccd979bd MF |
1014 | return 1; |
1015 | ||
94e41ecf | 1016 | jbd_lock_bh_state(bg_bh); |
ccd979bd | 1017 | bg = (struct ocfs2_group_desc *) bh2jh(bg_bh)->b_committed_data; |
94e41ecf SM |
1018 | if (bg) |
1019 | ret = !ocfs2_test_bit(nr, (unsigned long *)bg->bg_bitmap); | |
1020 | else | |
1021 | ret = 1; | |
1022 | jbd_unlock_bh_state(bg_bh); | |
1023 | ||
1024 | return ret; | |
ccd979bd MF |
1025 | } |
1026 | ||
1027 | static int ocfs2_block_group_find_clear_bits(struct ocfs2_super *osb, | |
1028 | struct buffer_head *bg_bh, | |
1029 | unsigned int bits_wanted, | |
7bf72ede | 1030 | unsigned int total_bits, |
ccd979bd MF |
1031 | u16 *bit_off, |
1032 | u16 *bits_found) | |
1033 | { | |
1034 | void *bitmap; | |
1035 | u16 best_offset, best_size; | |
1036 | int offset, start, found, status = 0; | |
1037 | struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data; | |
1038 | ||
42035306 JB |
1039 | /* Callers got this descriptor from |
1040 | * ocfs2_read_group_descriptor(). Any corruption is a code bug. */ | |
1041 | BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg)); | |
ccd979bd MF |
1042 | |
1043 | found = start = best_offset = best_size = 0; | |
1044 | bitmap = bg->bg_bitmap; | |
1045 | ||
7bf72ede MF |
1046 | while((offset = ocfs2_find_next_zero_bit(bitmap, total_bits, start)) != -1) { |
1047 | if (offset == total_bits) | |
ccd979bd MF |
1048 | break; |
1049 | ||
1050 | if (!ocfs2_test_bg_bit_allocatable(bg_bh, offset)) { | |
1051 | /* We found a zero, but we can't use it as it | |
1052 | * hasn't been put to disk yet! */ | |
1053 | found = 0; | |
1054 | start = offset + 1; | |
1055 | } else if (offset == start) { | |
1056 | /* we found a zero */ | |
1057 | found++; | |
1058 | /* move start to the next bit to test */ | |
1059 | start++; | |
1060 | } else { | |
1061 | /* got a zero after some ones */ | |
1062 | found = 1; | |
1063 | start = offset + 1; | |
1064 | } | |
1065 | if (found > best_size) { | |
1066 | best_size = found; | |
1067 | best_offset = start - found; | |
1068 | } | |
1069 | /* we got everything we needed */ | |
1070 | if (found == bits_wanted) { | |
1071 | /* mlog(0, "Found it all!\n"); */ | |
1072 | break; | |
1073 | } | |
1074 | } | |
1075 | ||
1076 | /* XXX: I think the first clause is equivalent to the second | |
1077 | * - jlbec */ | |
1078 | if (found == bits_wanted) { | |
1079 | *bit_off = start - found; | |
1080 | *bits_found = found; | |
1081 | } else if (best_size) { | |
1082 | *bit_off = best_offset; | |
1083 | *bits_found = best_size; | |
1084 | } else { | |
1085 | status = -ENOSPC; | |
1086 | /* No error log here -- see the comment above | |
1087 | * ocfs2_test_bg_bit_allocatable */ | |
1088 | } | |
1089 | ||
1090 | return status; | |
1091 | } | |
1092 | ||
1fabe148 | 1093 | static inline int ocfs2_block_group_set_bits(handle_t *handle, |
ccd979bd MF |
1094 | struct inode *alloc_inode, |
1095 | struct ocfs2_group_desc *bg, | |
1096 | struct buffer_head *group_bh, | |
1097 | unsigned int bit_off, | |
1098 | unsigned int num_bits) | |
1099 | { | |
1100 | int status; | |
1101 | void *bitmap = bg->bg_bitmap; | |
1102 | int journal_type = OCFS2_JOURNAL_ACCESS_WRITE; | |
1103 | ||
1104 | mlog_entry_void(); | |
1105 | ||
42035306 JB |
1106 | /* All callers get the descriptor via |
1107 | * ocfs2_read_group_descriptor(). Any corruption is a code bug. */ | |
1108 | BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg)); | |
ccd979bd MF |
1109 | BUG_ON(le16_to_cpu(bg->bg_free_bits_count) < num_bits); |
1110 | ||
1111 | mlog(0, "block_group_set_bits: off = %u, num = %u\n", bit_off, | |
1112 | num_bits); | |
1113 | ||
1114 | if (ocfs2_is_cluster_bitmap(alloc_inode)) | |
1115 | journal_type = OCFS2_JOURNAL_ACCESS_UNDO; | |
1116 | ||
13723d00 | 1117 | status = ocfs2_journal_access_gd(handle, |
0cf2f763 | 1118 | INODE_CACHE(alloc_inode), |
13723d00 JB |
1119 | group_bh, |
1120 | journal_type); | |
ccd979bd MF |
1121 | if (status < 0) { |
1122 | mlog_errno(status); | |
1123 | goto bail; | |
1124 | } | |
1125 | ||
1126 | le16_add_cpu(&bg->bg_free_bits_count, -num_bits); | |
ccd979bd MF |
1127 | while(num_bits--) |
1128 | ocfs2_set_bit(bit_off++, bitmap); | |
1129 | ||
ec20cec7 | 1130 | ocfs2_journal_dirty(handle, group_bh); |
ccd979bd MF |
1131 | |
1132 | bail: | |
1133 | mlog_exit(status); | |
1134 | return status; | |
1135 | } | |
1136 | ||
1137 | /* find the one with the most empty bits */ | |
1138 | static inline u16 ocfs2_find_victim_chain(struct ocfs2_chain_list *cl) | |
1139 | { | |
1140 | u16 curr, best; | |
1141 | ||
1142 | BUG_ON(!cl->cl_next_free_rec); | |
1143 | ||
1144 | best = curr = 0; | |
1145 | while (curr < le16_to_cpu(cl->cl_next_free_rec)) { | |
1146 | if (le32_to_cpu(cl->cl_recs[curr].c_free) > | |
1147 | le32_to_cpu(cl->cl_recs[best].c_free)) | |
1148 | best = curr; | |
1149 | curr++; | |
1150 | } | |
1151 | ||
1152 | BUG_ON(best >= le16_to_cpu(cl->cl_next_free_rec)); | |
1153 | return best; | |
1154 | } | |
1155 | ||
1fabe148 | 1156 | static int ocfs2_relink_block_group(handle_t *handle, |
ccd979bd MF |
1157 | struct inode *alloc_inode, |
1158 | struct buffer_head *fe_bh, | |
1159 | struct buffer_head *bg_bh, | |
1160 | struct buffer_head *prev_bg_bh, | |
1161 | u16 chain) | |
1162 | { | |
1163 | int status; | |
1164 | /* there is a really tiny chance the journal calls could fail, | |
1165 | * but we wouldn't want inconsistent blocks in *any* case. */ | |
1166 | u64 fe_ptr, bg_ptr, prev_bg_ptr; | |
1167 | struct ocfs2_dinode *fe = (struct ocfs2_dinode *) fe_bh->b_data; | |
1168 | struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data; | |
1169 | struct ocfs2_group_desc *prev_bg = (struct ocfs2_group_desc *) prev_bg_bh->b_data; | |
1170 | ||
42035306 JB |
1171 | /* The caller got these descriptors from |
1172 | * ocfs2_read_group_descriptor(). Any corruption is a code bug. */ | |
1173 | BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg)); | |
1174 | BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(prev_bg)); | |
ccd979bd | 1175 | |
b0697053 | 1176 | mlog(0, "Suballoc %llu, chain %u, move group %llu to top, prev = %llu\n", |
1ca1a111 MF |
1177 | (unsigned long long)le64_to_cpu(fe->i_blkno), chain, |
1178 | (unsigned long long)le64_to_cpu(bg->bg_blkno), | |
1179 | (unsigned long long)le64_to_cpu(prev_bg->bg_blkno)); | |
ccd979bd MF |
1180 | |
1181 | fe_ptr = le64_to_cpu(fe->id2.i_chain.cl_recs[chain].c_blkno); | |
1182 | bg_ptr = le64_to_cpu(bg->bg_next_group); | |
1183 | prev_bg_ptr = le64_to_cpu(prev_bg->bg_next_group); | |
1184 | ||
0cf2f763 JB |
1185 | status = ocfs2_journal_access_gd(handle, INODE_CACHE(alloc_inode), |
1186 | prev_bg_bh, | |
13723d00 | 1187 | OCFS2_JOURNAL_ACCESS_WRITE); |
ccd979bd MF |
1188 | if (status < 0) { |
1189 | mlog_errno(status); | |
1190 | goto out_rollback; | |
1191 | } | |
1192 | ||
1193 | prev_bg->bg_next_group = bg->bg_next_group; | |
ec20cec7 | 1194 | ocfs2_journal_dirty(handle, prev_bg_bh); |
ccd979bd | 1195 | |
0cf2f763 JB |
1196 | status = ocfs2_journal_access_gd(handle, INODE_CACHE(alloc_inode), |
1197 | bg_bh, OCFS2_JOURNAL_ACCESS_WRITE); | |
ccd979bd MF |
1198 | if (status < 0) { |
1199 | mlog_errno(status); | |
1200 | goto out_rollback; | |
1201 | } | |
1202 | ||
1203 | bg->bg_next_group = fe->id2.i_chain.cl_recs[chain].c_blkno; | |
ec20cec7 | 1204 | ocfs2_journal_dirty(handle, bg_bh); |
ccd979bd | 1205 | |
0cf2f763 JB |
1206 | status = ocfs2_journal_access_di(handle, INODE_CACHE(alloc_inode), |
1207 | fe_bh, OCFS2_JOURNAL_ACCESS_WRITE); | |
ccd979bd MF |
1208 | if (status < 0) { |
1209 | mlog_errno(status); | |
1210 | goto out_rollback; | |
1211 | } | |
1212 | ||
1213 | fe->id2.i_chain.cl_recs[chain].c_blkno = bg->bg_blkno; | |
ec20cec7 | 1214 | ocfs2_journal_dirty(handle, fe_bh); |
ccd979bd | 1215 | |
ccd979bd MF |
1216 | out_rollback: |
1217 | if (status < 0) { | |
1218 | fe->id2.i_chain.cl_recs[chain].c_blkno = cpu_to_le64(fe_ptr); | |
1219 | bg->bg_next_group = cpu_to_le64(bg_ptr); | |
1220 | prev_bg->bg_next_group = cpu_to_le64(prev_bg_ptr); | |
1221 | } | |
42035306 | 1222 | |
ccd979bd MF |
1223 | mlog_exit(status); |
1224 | return status; | |
1225 | } | |
1226 | ||
1227 | static inline int ocfs2_block_group_reasonably_empty(struct ocfs2_group_desc *bg, | |
1228 | u32 wanted) | |
1229 | { | |
1230 | return le16_to_cpu(bg->bg_free_bits_count) > wanted; | |
1231 | } | |
1232 | ||
1233 | /* return 0 on success, -ENOSPC to keep searching and any other < 0 | |
1234 | * value on error. */ | |
1235 | static int ocfs2_cluster_group_search(struct inode *inode, | |
1236 | struct buffer_head *group_bh, | |
1237 | u32 bits_wanted, u32 min_bits, | |
1187c968 | 1238 | u64 max_block, |
ccd979bd MF |
1239 | u16 *bit_off, u16 *bits_found) |
1240 | { | |
1241 | int search = -ENOSPC; | |
1242 | int ret; | |
1187c968 | 1243 | u64 blkoff; |
7bf72ede | 1244 | struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *) group_bh->b_data; |
9c7af40b | 1245 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd | 1246 | u16 tmp_off, tmp_found; |
7bf72ede | 1247 | unsigned int max_bits, gd_cluster_off; |
ccd979bd MF |
1248 | |
1249 | BUG_ON(!ocfs2_is_cluster_bitmap(inode)); | |
1250 | ||
7bf72ede MF |
1251 | if (gd->bg_free_bits_count) { |
1252 | max_bits = le16_to_cpu(gd->bg_bits); | |
1253 | ||
1254 | /* Tail groups in cluster bitmaps which aren't cpg | |
1255 | * aligned are prone to partial extention by a failed | |
1256 | * fs resize. If the file system resize never got to | |
1257 | * update the dinode cluster count, then we don't want | |
1258 | * to trust any clusters past it, regardless of what | |
1259 | * the group descriptor says. */ | |
1260 | gd_cluster_off = ocfs2_blocks_to_clusters(inode->i_sb, | |
1261 | le64_to_cpu(gd->bg_blkno)); | |
1262 | if ((gd_cluster_off + max_bits) > | |
1263 | OCFS2_I(inode)->ip_clusters) { | |
1264 | max_bits = OCFS2_I(inode)->ip_clusters - gd_cluster_off; | |
1265 | mlog(0, "Desc %llu, bg_bits %u, clusters %u, use %u\n", | |
1266 | (unsigned long long)le64_to_cpu(gd->bg_blkno), | |
1267 | le16_to_cpu(gd->bg_bits), | |
1268 | OCFS2_I(inode)->ip_clusters, max_bits); | |
1269 | } | |
1270 | ||
ccd979bd MF |
1271 | ret = ocfs2_block_group_find_clear_bits(OCFS2_SB(inode->i_sb), |
1272 | group_bh, bits_wanted, | |
7bf72ede | 1273 | max_bits, |
ccd979bd MF |
1274 | &tmp_off, &tmp_found); |
1275 | if (ret) | |
1276 | return ret; | |
1277 | ||
1187c968 JB |
1278 | if (max_block) { |
1279 | blkoff = ocfs2_clusters_to_blocks(inode->i_sb, | |
1280 | gd_cluster_off + | |
1281 | tmp_off + tmp_found); | |
1282 | mlog(0, "Checking %llu against %llu\n", | |
1283 | (unsigned long long)blkoff, | |
1284 | (unsigned long long)max_block); | |
1285 | if (blkoff > max_block) | |
1286 | return -ENOSPC; | |
1287 | } | |
1288 | ||
ccd979bd MF |
1289 | /* ocfs2_block_group_find_clear_bits() might |
1290 | * return success, but we still want to return | |
1291 | * -ENOSPC unless it found the minimum number | |
1292 | * of bits. */ | |
1293 | if (min_bits <= tmp_found) { | |
1294 | *bit_off = tmp_off; | |
1295 | *bits_found = tmp_found; | |
1296 | search = 0; /* success */ | |
9c7af40b MF |
1297 | } else if (tmp_found) { |
1298 | /* | |
1299 | * Don't show bits which we'll be returning | |
1300 | * for allocation to the local alloc bitmap. | |
1301 | */ | |
1302 | ocfs2_local_alloc_seen_free_bits(osb, tmp_found); | |
ccd979bd MF |
1303 | } |
1304 | } | |
1305 | ||
1306 | return search; | |
1307 | } | |
1308 | ||
1309 | static int ocfs2_block_group_search(struct inode *inode, | |
1310 | struct buffer_head *group_bh, | |
1311 | u32 bits_wanted, u32 min_bits, | |
1187c968 | 1312 | u64 max_block, |
ccd979bd MF |
1313 | u16 *bit_off, u16 *bits_found) |
1314 | { | |
1315 | int ret = -ENOSPC; | |
1187c968 | 1316 | u64 blkoff; |
ccd979bd MF |
1317 | struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) group_bh->b_data; |
1318 | ||
1319 | BUG_ON(min_bits != 1); | |
1320 | BUG_ON(ocfs2_is_cluster_bitmap(inode)); | |
1321 | ||
1187c968 | 1322 | if (bg->bg_free_bits_count) { |
ccd979bd MF |
1323 | ret = ocfs2_block_group_find_clear_bits(OCFS2_SB(inode->i_sb), |
1324 | group_bh, bits_wanted, | |
7bf72ede | 1325 | le16_to_cpu(bg->bg_bits), |
ccd979bd | 1326 | bit_off, bits_found); |
1187c968 JB |
1327 | if (!ret && max_block) { |
1328 | blkoff = le64_to_cpu(bg->bg_blkno) + *bit_off + | |
1329 | *bits_found; | |
1330 | mlog(0, "Checking %llu against %llu\n", | |
1331 | (unsigned long long)blkoff, | |
1332 | (unsigned long long)max_block); | |
1333 | if (blkoff > max_block) | |
1334 | ret = -ENOSPC; | |
1335 | } | |
1336 | } | |
ccd979bd MF |
1337 | |
1338 | return ret; | |
1339 | } | |
1340 | ||
883d4cae | 1341 | static int ocfs2_alloc_dinode_update_counts(struct inode *inode, |
1fabe148 | 1342 | handle_t *handle, |
883d4cae MF |
1343 | struct buffer_head *di_bh, |
1344 | u32 num_bits, | |
1345 | u16 chain) | |
1346 | { | |
1347 | int ret; | |
1348 | u32 tmp_used; | |
1349 | struct ocfs2_dinode *di = (struct ocfs2_dinode *) di_bh->b_data; | |
1350 | struct ocfs2_chain_list *cl = (struct ocfs2_chain_list *) &di->id2.i_chain; | |
1351 | ||
0cf2f763 | 1352 | ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh, |
13723d00 | 1353 | OCFS2_JOURNAL_ACCESS_WRITE); |
883d4cae MF |
1354 | if (ret < 0) { |
1355 | mlog_errno(ret); | |
1356 | goto out; | |
1357 | } | |
1358 | ||
1359 | tmp_used = le32_to_cpu(di->id1.bitmap1.i_used); | |
1360 | di->id1.bitmap1.i_used = cpu_to_le32(num_bits + tmp_used); | |
1361 | le32_add_cpu(&cl->cl_recs[chain].c_free, -num_bits); | |
ec20cec7 | 1362 | ocfs2_journal_dirty(handle, di_bh); |
883d4cae MF |
1363 | |
1364 | out: | |
1365 | return ret; | |
1366 | } | |
1367 | ||
1368 | static int ocfs2_search_one_group(struct ocfs2_alloc_context *ac, | |
1fabe148 | 1369 | handle_t *handle, |
883d4cae MF |
1370 | u32 bits_wanted, |
1371 | u32 min_bits, | |
1372 | u16 *bit_off, | |
1373 | unsigned int *num_bits, | |
1374 | u64 gd_blkno, | |
1375 | u16 *bits_left) | |
1376 | { | |
1377 | int ret; | |
1378 | u16 found; | |
1379 | struct buffer_head *group_bh = NULL; | |
1380 | struct ocfs2_group_desc *gd; | |
68f64d47 | 1381 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)ac->ac_bh->b_data; |
883d4cae | 1382 | struct inode *alloc_inode = ac->ac_inode; |
883d4cae | 1383 | |
68f64d47 JB |
1384 | ret = ocfs2_read_group_descriptor(alloc_inode, di, gd_blkno, |
1385 | &group_bh); | |
883d4cae MF |
1386 | if (ret < 0) { |
1387 | mlog_errno(ret); | |
1388 | return ret; | |
1389 | } | |
1390 | ||
1391 | gd = (struct ocfs2_group_desc *) group_bh->b_data; | |
883d4cae | 1392 | ret = ac->ac_group_search(alloc_inode, group_bh, bits_wanted, min_bits, |
1187c968 | 1393 | ac->ac_max_block, bit_off, &found); |
883d4cae MF |
1394 | if (ret < 0) { |
1395 | if (ret != -ENOSPC) | |
1396 | mlog_errno(ret); | |
1397 | goto out; | |
1398 | } | |
1399 | ||
1400 | *num_bits = found; | |
1401 | ||
1402 | ret = ocfs2_alloc_dinode_update_counts(alloc_inode, handle, ac->ac_bh, | |
1403 | *num_bits, | |
1404 | le16_to_cpu(gd->bg_chain)); | |
1405 | if (ret < 0) { | |
1406 | mlog_errno(ret); | |
1407 | goto out; | |
1408 | } | |
1409 | ||
1410 | ret = ocfs2_block_group_set_bits(handle, alloc_inode, gd, group_bh, | |
1411 | *bit_off, *num_bits); | |
1412 | if (ret < 0) | |
1413 | mlog_errno(ret); | |
1414 | ||
1415 | *bits_left = le16_to_cpu(gd->bg_free_bits_count); | |
1416 | ||
1417 | out: | |
1418 | brelse(group_bh); | |
1419 | ||
1420 | return ret; | |
1421 | } | |
1422 | ||
ccd979bd | 1423 | static int ocfs2_search_chain(struct ocfs2_alloc_context *ac, |
1fabe148 | 1424 | handle_t *handle, |
ccd979bd MF |
1425 | u32 bits_wanted, |
1426 | u32 min_bits, | |
1427 | u16 *bit_off, | |
1428 | unsigned int *num_bits, | |
883d4cae MF |
1429 | u64 *bg_blkno, |
1430 | u16 *bits_left) | |
ccd979bd MF |
1431 | { |
1432 | int status; | |
1433 | u16 chain, tmp_bits; | |
1434 | u32 tmp_used; | |
1435 | u64 next_group; | |
ccd979bd MF |
1436 | struct inode *alloc_inode = ac->ac_inode; |
1437 | struct buffer_head *group_bh = NULL; | |
1438 | struct buffer_head *prev_group_bh = NULL; | |
1439 | struct ocfs2_dinode *fe = (struct ocfs2_dinode *) ac->ac_bh->b_data; | |
1440 | struct ocfs2_chain_list *cl = (struct ocfs2_chain_list *) &fe->id2.i_chain; | |
1441 | struct ocfs2_group_desc *bg; | |
1442 | ||
1443 | chain = ac->ac_chain; | |
b0697053 MF |
1444 | mlog(0, "trying to alloc %u bits from chain %u, inode %llu\n", |
1445 | bits_wanted, chain, | |
1446 | (unsigned long long)OCFS2_I(alloc_inode)->ip_blkno); | |
ccd979bd | 1447 | |
68f64d47 JB |
1448 | status = ocfs2_read_group_descriptor(alloc_inode, fe, |
1449 | le64_to_cpu(cl->cl_recs[chain].c_blkno), | |
1450 | &group_bh); | |
ccd979bd MF |
1451 | if (status < 0) { |
1452 | mlog_errno(status); | |
1453 | goto bail; | |
1454 | } | |
1455 | bg = (struct ocfs2_group_desc *) group_bh->b_data; | |
ccd979bd MF |
1456 | |
1457 | status = -ENOSPC; | |
1458 | /* for now, the chain search is a bit simplistic. We just use | |
1459 | * the 1st group with any empty bits. */ | |
1187c968 JB |
1460 | while ((status = ac->ac_group_search(alloc_inode, group_bh, |
1461 | bits_wanted, min_bits, | |
1462 | ac->ac_max_block, bit_off, | |
1463 | &tmp_bits)) == -ENOSPC) { | |
ccd979bd MF |
1464 | if (!bg->bg_next_group) |
1465 | break; | |
a81cb88b MF |
1466 | |
1467 | brelse(prev_group_bh); | |
1468 | prev_group_bh = NULL; | |
1469 | ||
ccd979bd MF |
1470 | next_group = le64_to_cpu(bg->bg_next_group); |
1471 | prev_group_bh = group_bh; | |
1472 | group_bh = NULL; | |
68f64d47 JB |
1473 | status = ocfs2_read_group_descriptor(alloc_inode, fe, |
1474 | next_group, &group_bh); | |
ccd979bd MF |
1475 | if (status < 0) { |
1476 | mlog_errno(status); | |
1477 | goto bail; | |
1478 | } | |
1479 | bg = (struct ocfs2_group_desc *) group_bh->b_data; | |
ccd979bd MF |
1480 | } |
1481 | if (status < 0) { | |
1482 | if (status != -ENOSPC) | |
1483 | mlog_errno(status); | |
1484 | goto bail; | |
1485 | } | |
1486 | ||
b0697053 | 1487 | mlog(0, "alloc succeeds: we give %u bits from block group %llu\n", |
1ca1a111 | 1488 | tmp_bits, (unsigned long long)le64_to_cpu(bg->bg_blkno)); |
ccd979bd MF |
1489 | |
1490 | *num_bits = tmp_bits; | |
1491 | ||
1492 | BUG_ON(*num_bits == 0); | |
1493 | ||
1494 | /* | |
1495 | * Keep track of previous block descriptor read. When | |
1496 | * we find a target, if we have read more than X | |
1497 | * number of descriptors, and the target is reasonably | |
1498 | * empty, relink him to top of his chain. | |
1499 | * | |
1500 | * We've read 0 extra blocks and only send one more to | |
1501 | * the transaction, yet the next guy to search has a | |
1502 | * much easier time. | |
1503 | * | |
1504 | * Do this *after* figuring out how many bits we're taking out | |
1505 | * of our target group. | |
1506 | */ | |
1507 | if (ac->ac_allow_chain_relink && | |
1508 | (prev_group_bh) && | |
1509 | (ocfs2_block_group_reasonably_empty(bg, *num_bits))) { | |
1510 | status = ocfs2_relink_block_group(handle, alloc_inode, | |
1511 | ac->ac_bh, group_bh, | |
1512 | prev_group_bh, chain); | |
1513 | if (status < 0) { | |
1514 | mlog_errno(status); | |
1515 | goto bail; | |
1516 | } | |
1517 | } | |
1518 | ||
1519 | /* Ok, claim our bits now: set the info on dinode, chainlist | |
1520 | * and then the group */ | |
13723d00 | 1521 | status = ocfs2_journal_access_di(handle, |
0cf2f763 | 1522 | INODE_CACHE(alloc_inode), |
13723d00 JB |
1523 | ac->ac_bh, |
1524 | OCFS2_JOURNAL_ACCESS_WRITE); | |
ccd979bd MF |
1525 | if (status < 0) { |
1526 | mlog_errno(status); | |
1527 | goto bail; | |
1528 | } | |
1529 | ||
1530 | tmp_used = le32_to_cpu(fe->id1.bitmap1.i_used); | |
1531 | fe->id1.bitmap1.i_used = cpu_to_le32(*num_bits + tmp_used); | |
1532 | le32_add_cpu(&cl->cl_recs[chain].c_free, -(*num_bits)); | |
ec20cec7 | 1533 | ocfs2_journal_dirty(handle, ac->ac_bh); |
ccd979bd MF |
1534 | |
1535 | status = ocfs2_block_group_set_bits(handle, | |
1536 | alloc_inode, | |
1537 | bg, | |
1538 | group_bh, | |
1539 | *bit_off, | |
1540 | *num_bits); | |
1541 | if (status < 0) { | |
1542 | mlog_errno(status); | |
1543 | goto bail; | |
1544 | } | |
1545 | ||
b0697053 | 1546 | mlog(0, "Allocated %u bits from suballocator %llu\n", *num_bits, |
1ca1a111 | 1547 | (unsigned long long)le64_to_cpu(fe->i_blkno)); |
ccd979bd MF |
1548 | |
1549 | *bg_blkno = le64_to_cpu(bg->bg_blkno); | |
883d4cae | 1550 | *bits_left = le16_to_cpu(bg->bg_free_bits_count); |
ccd979bd | 1551 | bail: |
a81cb88b MF |
1552 | brelse(group_bh); |
1553 | brelse(prev_group_bh); | |
ccd979bd MF |
1554 | |
1555 | mlog_exit(status); | |
1556 | return status; | |
1557 | } | |
1558 | ||
1559 | /* will give out up to bits_wanted contiguous bits. */ | |
1560 | static int ocfs2_claim_suballoc_bits(struct ocfs2_super *osb, | |
1561 | struct ocfs2_alloc_context *ac, | |
1fabe148 | 1562 | handle_t *handle, |
ccd979bd MF |
1563 | u32 bits_wanted, |
1564 | u32 min_bits, | |
1565 | u16 *bit_off, | |
1566 | unsigned int *num_bits, | |
1567 | u64 *bg_blkno) | |
1568 | { | |
1569 | int status; | |
1570 | u16 victim, i; | |
883d4cae MF |
1571 | u16 bits_left = 0; |
1572 | u64 hint_blkno = ac->ac_last_group; | |
ccd979bd MF |
1573 | struct ocfs2_chain_list *cl; |
1574 | struct ocfs2_dinode *fe; | |
1575 | ||
1576 | mlog_entry_void(); | |
1577 | ||
1578 | BUG_ON(ac->ac_bits_given >= ac->ac_bits_wanted); | |
1579 | BUG_ON(bits_wanted > (ac->ac_bits_wanted - ac->ac_bits_given)); | |
1580 | BUG_ON(!ac->ac_bh); | |
1581 | ||
1582 | fe = (struct ocfs2_dinode *) ac->ac_bh->b_data; | |
10995aa2 JB |
1583 | |
1584 | /* The bh was validated by the inode read during | |
1585 | * ocfs2_reserve_suballoc_bits(). Any corruption is a code bug. */ | |
1586 | BUG_ON(!OCFS2_IS_VALID_DINODE(fe)); | |
1587 | ||
ccd979bd MF |
1588 | if (le32_to_cpu(fe->id1.bitmap1.i_used) >= |
1589 | le32_to_cpu(fe->id1.bitmap1.i_total)) { | |
b0697053 MF |
1590 | ocfs2_error(osb->sb, "Chain allocator dinode %llu has %u used " |
1591 | "bits but only %u total.", | |
1592 | (unsigned long long)le64_to_cpu(fe->i_blkno), | |
ccd979bd MF |
1593 | le32_to_cpu(fe->id1.bitmap1.i_used), |
1594 | le32_to_cpu(fe->id1.bitmap1.i_total)); | |
1595 | status = -EIO; | |
1596 | goto bail; | |
1597 | } | |
1598 | ||
883d4cae MF |
1599 | if (hint_blkno) { |
1600 | /* Attempt to short-circuit the usual search mechanism | |
1601 | * by jumping straight to the most recently used | |
1602 | * allocation group. This helps us mantain some | |
1603 | * contiguousness across allocations. */ | |
da5cbf2f MF |
1604 | status = ocfs2_search_one_group(ac, handle, bits_wanted, |
1605 | min_bits, bit_off, num_bits, | |
883d4cae MF |
1606 | hint_blkno, &bits_left); |
1607 | if (!status) { | |
1608 | /* Be careful to update *bg_blkno here as the | |
1609 | * caller is expecting it to be filled in, and | |
1610 | * ocfs2_search_one_group() won't do that for | |
1611 | * us. */ | |
1612 | *bg_blkno = hint_blkno; | |
1613 | goto set_hint; | |
1614 | } | |
1615 | if (status < 0 && status != -ENOSPC) { | |
1616 | mlog_errno(status); | |
1617 | goto bail; | |
1618 | } | |
1619 | } | |
1620 | ||
ccd979bd MF |
1621 | cl = (struct ocfs2_chain_list *) &fe->id2.i_chain; |
1622 | ||
1623 | victim = ocfs2_find_victim_chain(cl); | |
1624 | ac->ac_chain = victim; | |
1625 | ac->ac_allow_chain_relink = 1; | |
1626 | ||
da5cbf2f | 1627 | status = ocfs2_search_chain(ac, handle, bits_wanted, min_bits, bit_off, |
883d4cae | 1628 | num_bits, bg_blkno, &bits_left); |
ccd979bd | 1629 | if (!status) |
883d4cae | 1630 | goto set_hint; |
ccd979bd MF |
1631 | if (status < 0 && status != -ENOSPC) { |
1632 | mlog_errno(status); | |
1633 | goto bail; | |
1634 | } | |
1635 | ||
1636 | mlog(0, "Search of victim chain %u came up with nothing, " | |
1637 | "trying all chains now.\n", victim); | |
1638 | ||
1639 | /* If we didn't pick a good victim, then just default to | |
1640 | * searching each chain in order. Don't allow chain relinking | |
1641 | * because we only calculate enough journal credits for one | |
1642 | * relink per alloc. */ | |
1643 | ac->ac_allow_chain_relink = 0; | |
1644 | for (i = 0; i < le16_to_cpu(cl->cl_next_free_rec); i ++) { | |
1645 | if (i == victim) | |
1646 | continue; | |
1647 | if (!cl->cl_recs[i].c_free) | |
1648 | continue; | |
1649 | ||
1650 | ac->ac_chain = i; | |
da5cbf2f | 1651 | status = ocfs2_search_chain(ac, handle, bits_wanted, min_bits, |
883d4cae MF |
1652 | bit_off, num_bits, bg_blkno, |
1653 | &bits_left); | |
ccd979bd MF |
1654 | if (!status) |
1655 | break; | |
1656 | if (status < 0 && status != -ENOSPC) { | |
1657 | mlog_errno(status); | |
1658 | goto bail; | |
1659 | } | |
1660 | } | |
ccd979bd | 1661 | |
883d4cae MF |
1662 | set_hint: |
1663 | if (status != -ENOSPC) { | |
1664 | /* If the next search of this group is not likely to | |
1665 | * yield a suitable extent, then we reset the last | |
1666 | * group hint so as to not waste a disk read */ | |
1667 | if (bits_left < min_bits) | |
1668 | ac->ac_last_group = 0; | |
1669 | else | |
1670 | ac->ac_last_group = *bg_blkno; | |
1671 | } | |
1672 | ||
1673 | bail: | |
ccd979bd MF |
1674 | mlog_exit(status); |
1675 | return status; | |
1676 | } | |
1677 | ||
1678 | int ocfs2_claim_metadata(struct ocfs2_super *osb, | |
1fabe148 | 1679 | handle_t *handle, |
ccd979bd MF |
1680 | struct ocfs2_alloc_context *ac, |
1681 | u32 bits_wanted, | |
1682 | u16 *suballoc_bit_start, | |
1683 | unsigned int *num_bits, | |
1684 | u64 *blkno_start) | |
1685 | { | |
1686 | int status; | |
1687 | u64 bg_blkno; | |
1688 | ||
1689 | BUG_ON(!ac); | |
1690 | BUG_ON(ac->ac_bits_wanted < (ac->ac_bits_given + bits_wanted)); | |
1691 | BUG_ON(ac->ac_which != OCFS2_AC_USE_META); | |
ccd979bd MF |
1692 | |
1693 | status = ocfs2_claim_suballoc_bits(osb, | |
1694 | ac, | |
da5cbf2f | 1695 | handle, |
ccd979bd MF |
1696 | bits_wanted, |
1697 | 1, | |
1698 | suballoc_bit_start, | |
1699 | num_bits, | |
1700 | &bg_blkno); | |
1701 | if (status < 0) { | |
1702 | mlog_errno(status); | |
1703 | goto bail; | |
1704 | } | |
1705 | atomic_inc(&osb->alloc_stats.bg_allocs); | |
1706 | ||
1707 | *blkno_start = bg_blkno + (u64) *suballoc_bit_start; | |
1708 | ac->ac_bits_given += (*num_bits); | |
1709 | status = 0; | |
1710 | bail: | |
1711 | mlog_exit(status); | |
1712 | return status; | |
1713 | } | |
1714 | ||
13821151 TM |
1715 | static void ocfs2_init_inode_ac_group(struct inode *dir, |
1716 | struct buffer_head *parent_fe_bh, | |
1717 | struct ocfs2_alloc_context *ac) | |
1718 | { | |
1719 | struct ocfs2_dinode *fe = (struct ocfs2_dinode *)parent_fe_bh->b_data; | |
1720 | /* | |
1721 | * Try to allocate inodes from some specific group. | |
1722 | * | |
1723 | * If the parent dir has recorded the last group used in allocation, | |
1724 | * cool, use it. Otherwise if we try to allocate new inode from the | |
1725 | * same slot the parent dir belongs to, use the same chunk. | |
1726 | * | |
1727 | * We are very careful here to avoid the mistake of setting | |
1728 | * ac_last_group to a group descriptor from a different (unlocked) slot. | |
1729 | */ | |
1730 | if (OCFS2_I(dir)->ip_last_used_group && | |
1731 | OCFS2_I(dir)->ip_last_used_slot == ac->ac_alloc_slot) | |
1732 | ac->ac_last_group = OCFS2_I(dir)->ip_last_used_group; | |
1733 | else if (le16_to_cpu(fe->i_suballoc_slot) == ac->ac_alloc_slot) | |
1734 | ac->ac_last_group = ocfs2_which_suballoc_group( | |
1735 | le64_to_cpu(fe->i_blkno), | |
1736 | le16_to_cpu(fe->i_suballoc_bit)); | |
1737 | } | |
1738 | ||
1739 | static inline void ocfs2_save_inode_ac_group(struct inode *dir, | |
1740 | struct ocfs2_alloc_context *ac) | |
1741 | { | |
1742 | OCFS2_I(dir)->ip_last_used_group = ac->ac_last_group; | |
1743 | OCFS2_I(dir)->ip_last_used_slot = ac->ac_alloc_slot; | |
1744 | } | |
1745 | ||
ccd979bd | 1746 | int ocfs2_claim_new_inode(struct ocfs2_super *osb, |
1fabe148 | 1747 | handle_t *handle, |
13821151 TM |
1748 | struct inode *dir, |
1749 | struct buffer_head *parent_fe_bh, | |
ccd979bd MF |
1750 | struct ocfs2_alloc_context *ac, |
1751 | u16 *suballoc_bit, | |
1752 | u64 *fe_blkno) | |
1753 | { | |
1754 | int status; | |
1755 | unsigned int num_bits; | |
1756 | u64 bg_blkno; | |
1757 | ||
1758 | mlog_entry_void(); | |
1759 | ||
1760 | BUG_ON(!ac); | |
1761 | BUG_ON(ac->ac_bits_given != 0); | |
1762 | BUG_ON(ac->ac_bits_wanted != 1); | |
1763 | BUG_ON(ac->ac_which != OCFS2_AC_USE_INODE); | |
ccd979bd | 1764 | |
13821151 TM |
1765 | ocfs2_init_inode_ac_group(dir, parent_fe_bh, ac); |
1766 | ||
ccd979bd MF |
1767 | status = ocfs2_claim_suballoc_bits(osb, |
1768 | ac, | |
da5cbf2f | 1769 | handle, |
ccd979bd MF |
1770 | 1, |
1771 | 1, | |
1772 | suballoc_bit, | |
1773 | &num_bits, | |
1774 | &bg_blkno); | |
1775 | if (status < 0) { | |
1776 | mlog_errno(status); | |
1777 | goto bail; | |
1778 | } | |
1779 | atomic_inc(&osb->alloc_stats.bg_allocs); | |
1780 | ||
1781 | BUG_ON(num_bits != 1); | |
1782 | ||
1783 | *fe_blkno = bg_blkno + (u64) (*suballoc_bit); | |
1784 | ac->ac_bits_given++; | |
13821151 | 1785 | ocfs2_save_inode_ac_group(dir, ac); |
ccd979bd MF |
1786 | status = 0; |
1787 | bail: | |
1788 | mlog_exit(status); | |
1789 | return status; | |
1790 | } | |
1791 | ||
1792 | /* translate a group desc. blkno and it's bitmap offset into | |
1793 | * disk cluster offset. */ | |
1794 | static inline u32 ocfs2_desc_bitmap_to_cluster_off(struct inode *inode, | |
1795 | u64 bg_blkno, | |
1796 | u16 bg_bit_off) | |
1797 | { | |
1798 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1799 | u32 cluster = 0; | |
1800 | ||
1801 | BUG_ON(!ocfs2_is_cluster_bitmap(inode)); | |
1802 | ||
1803 | if (bg_blkno != osb->first_cluster_group_blkno) | |
1804 | cluster = ocfs2_blocks_to_clusters(inode->i_sb, bg_blkno); | |
1805 | cluster += (u32) bg_bit_off; | |
1806 | return cluster; | |
1807 | } | |
1808 | ||
1809 | /* given a cluster offset, calculate which block group it belongs to | |
1810 | * and return that block offset. */ | |
d659072f | 1811 | u64 ocfs2_which_cluster_group(struct inode *inode, u32 cluster) |
ccd979bd MF |
1812 | { |
1813 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1814 | u32 group_no; | |
1815 | ||
1816 | BUG_ON(!ocfs2_is_cluster_bitmap(inode)); | |
1817 | ||
1818 | group_no = cluster / osb->bitmap_cpg; | |
1819 | if (!group_no) | |
1820 | return osb->first_cluster_group_blkno; | |
1821 | return ocfs2_clusters_to_blocks(inode->i_sb, | |
1822 | group_no * osb->bitmap_cpg); | |
1823 | } | |
1824 | ||
1825 | /* given the block number of a cluster start, calculate which cluster | |
1826 | * group and descriptor bitmap offset that corresponds to. */ | |
1827 | static inline void ocfs2_block_to_cluster_group(struct inode *inode, | |
1828 | u64 data_blkno, | |
1829 | u64 *bg_blkno, | |
1830 | u16 *bg_bit_off) | |
1831 | { | |
1832 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1833 | u32 data_cluster = ocfs2_blocks_to_clusters(osb->sb, data_blkno); | |
1834 | ||
1835 | BUG_ON(!ocfs2_is_cluster_bitmap(inode)); | |
1836 | ||
1837 | *bg_blkno = ocfs2_which_cluster_group(inode, | |
1838 | data_cluster); | |
1839 | ||
1840 | if (*bg_blkno == osb->first_cluster_group_blkno) | |
1841 | *bg_bit_off = (u16) data_cluster; | |
1842 | else | |
1843 | *bg_bit_off = (u16) ocfs2_blocks_to_clusters(osb->sb, | |
1844 | data_blkno - *bg_blkno); | |
1845 | } | |
1846 | ||
1847 | /* | |
1848 | * min_bits - minimum contiguous chunk from this total allocation we | |
1849 | * can handle. set to what we asked for originally for a full | |
1850 | * contig. allocation, set to '1' to indicate we can deal with extents | |
1851 | * of any size. | |
1852 | */ | |
415cb800 MF |
1853 | int __ocfs2_claim_clusters(struct ocfs2_super *osb, |
1854 | handle_t *handle, | |
1855 | struct ocfs2_alloc_context *ac, | |
1856 | u32 min_clusters, | |
1857 | u32 max_clusters, | |
1858 | u32 *cluster_start, | |
1859 | u32 *num_clusters) | |
ccd979bd MF |
1860 | { |
1861 | int status; | |
415cb800 | 1862 | unsigned int bits_wanted = max_clusters; |
883d4cae | 1863 | u64 bg_blkno = 0; |
ccd979bd MF |
1864 | u16 bg_bit_off; |
1865 | ||
1866 | mlog_entry_void(); | |
1867 | ||
ccd979bd MF |
1868 | BUG_ON(ac->ac_bits_given >= ac->ac_bits_wanted); |
1869 | ||
1870 | BUG_ON(ac->ac_which != OCFS2_AC_USE_LOCAL | |
1871 | && ac->ac_which != OCFS2_AC_USE_MAIN); | |
ccd979bd MF |
1872 | |
1873 | if (ac->ac_which == OCFS2_AC_USE_LOCAL) { | |
1874 | status = ocfs2_claim_local_alloc_bits(osb, | |
1875 | handle, | |
1876 | ac, | |
1877 | bits_wanted, | |
1878 | cluster_start, | |
1879 | num_clusters); | |
1880 | if (!status) | |
1881 | atomic_inc(&osb->alloc_stats.local_data); | |
1882 | } else { | |
1883 | if (min_clusters > (osb->bitmap_cpg - 1)) { | |
1884 | /* The only paths asking for contiguousness | |
1885 | * should know about this already. */ | |
2fbe8d1e SM |
1886 | mlog(ML_ERROR, "minimum allocation requested %u exceeds " |
1887 | "group bitmap size %u!\n", min_clusters, | |
1888 | osb->bitmap_cpg); | |
ccd979bd MF |
1889 | status = -ENOSPC; |
1890 | goto bail; | |
1891 | } | |
1892 | /* clamp the current request down to a realistic size. */ | |
1893 | if (bits_wanted > (osb->bitmap_cpg - 1)) | |
1894 | bits_wanted = osb->bitmap_cpg - 1; | |
1895 | ||
1896 | status = ocfs2_claim_suballoc_bits(osb, | |
1897 | ac, | |
da5cbf2f | 1898 | handle, |
ccd979bd MF |
1899 | bits_wanted, |
1900 | min_clusters, | |
1901 | &bg_bit_off, | |
1902 | num_clusters, | |
1903 | &bg_blkno); | |
1904 | if (!status) { | |
1905 | *cluster_start = | |
1906 | ocfs2_desc_bitmap_to_cluster_off(ac->ac_inode, | |
1907 | bg_blkno, | |
1908 | bg_bit_off); | |
1909 | atomic_inc(&osb->alloc_stats.bitmap_data); | |
1910 | } | |
1911 | } | |
1912 | if (status < 0) { | |
1913 | if (status != -ENOSPC) | |
1914 | mlog_errno(status); | |
1915 | goto bail; | |
1916 | } | |
1917 | ||
1918 | ac->ac_bits_given += *num_clusters; | |
1919 | ||
1920 | bail: | |
1921 | mlog_exit(status); | |
1922 | return status; | |
1923 | } | |
1924 | ||
415cb800 MF |
1925 | int ocfs2_claim_clusters(struct ocfs2_super *osb, |
1926 | handle_t *handle, | |
1927 | struct ocfs2_alloc_context *ac, | |
1928 | u32 min_clusters, | |
1929 | u32 *cluster_start, | |
1930 | u32 *num_clusters) | |
1931 | { | |
1932 | unsigned int bits_wanted = ac->ac_bits_wanted - ac->ac_bits_given; | |
1933 | ||
1934 | return __ocfs2_claim_clusters(osb, handle, ac, min_clusters, | |
1935 | bits_wanted, cluster_start, num_clusters); | |
1936 | } | |
1937 | ||
b4414eea MF |
1938 | static int ocfs2_block_group_clear_bits(handle_t *handle, |
1939 | struct inode *alloc_inode, | |
1940 | struct ocfs2_group_desc *bg, | |
1941 | struct buffer_head *group_bh, | |
1942 | unsigned int bit_off, | |
1943 | unsigned int num_bits, | |
1944 | void (*undo_fn)(unsigned int bit, | |
1945 | unsigned long *bmap)) | |
ccd979bd MF |
1946 | { |
1947 | int status; | |
1948 | unsigned int tmp; | |
ccd979bd MF |
1949 | struct ocfs2_group_desc *undo_bg = NULL; |
1950 | ||
1951 | mlog_entry_void(); | |
1952 | ||
42035306 JB |
1953 | /* The caller got this descriptor from |
1954 | * ocfs2_read_group_descriptor(). Any corruption is a code bug. */ | |
1955 | BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg)); | |
ccd979bd MF |
1956 | |
1957 | mlog(0, "off = %u, num = %u\n", bit_off, num_bits); | |
1958 | ||
b4414eea | 1959 | BUG_ON(undo_fn && !ocfs2_is_cluster_bitmap(alloc_inode)); |
0cf2f763 | 1960 | status = ocfs2_journal_access_gd(handle, INODE_CACHE(alloc_inode), |
b4414eea MF |
1961 | group_bh, |
1962 | undo_fn ? | |
1963 | OCFS2_JOURNAL_ACCESS_UNDO : | |
1964 | OCFS2_JOURNAL_ACCESS_WRITE); | |
ccd979bd MF |
1965 | if (status < 0) { |
1966 | mlog_errno(status); | |
1967 | goto bail; | |
1968 | } | |
1969 | ||
b4414eea | 1970 | if (undo_fn) { |
94e41ecf SM |
1971 | jbd_lock_bh_state(group_bh); |
1972 | undo_bg = (struct ocfs2_group_desc *) | |
1973 | bh2jh(group_bh)->b_committed_data; | |
1974 | BUG_ON(!undo_bg); | |
1975 | } | |
ccd979bd MF |
1976 | |
1977 | tmp = num_bits; | |
1978 | while(tmp--) { | |
1979 | ocfs2_clear_bit((bit_off + tmp), | |
1980 | (unsigned long *) bg->bg_bitmap); | |
b4414eea MF |
1981 | if (undo_fn) |
1982 | undo_fn(bit_off + tmp, | |
1983 | (unsigned long *) undo_bg->bg_bitmap); | |
ccd979bd MF |
1984 | } |
1985 | le16_add_cpu(&bg->bg_free_bits_count, num_bits); | |
1986 | ||
b4414eea | 1987 | if (undo_fn) |
94e41ecf SM |
1988 | jbd_unlock_bh_state(group_bh); |
1989 | ||
ec20cec7 | 1990 | ocfs2_journal_dirty(handle, group_bh); |
ccd979bd MF |
1991 | bail: |
1992 | return status; | |
1993 | } | |
1994 | ||
1995 | /* | |
1996 | * expects the suballoc inode to already be locked. | |
1997 | */ | |
b4414eea MF |
1998 | static int _ocfs2_free_suballoc_bits(handle_t *handle, |
1999 | struct inode *alloc_inode, | |
2000 | struct buffer_head *alloc_bh, | |
2001 | unsigned int start_bit, | |
2002 | u64 bg_blkno, | |
2003 | unsigned int count, | |
2004 | void (*undo_fn)(unsigned int bit, | |
2005 | unsigned long *bitmap)) | |
ccd979bd MF |
2006 | { |
2007 | int status = 0; | |
2008 | u32 tmp_used; | |
ccd979bd MF |
2009 | struct ocfs2_dinode *fe = (struct ocfs2_dinode *) alloc_bh->b_data; |
2010 | struct ocfs2_chain_list *cl = &fe->id2.i_chain; | |
2011 | struct buffer_head *group_bh = NULL; | |
2012 | struct ocfs2_group_desc *group; | |
2013 | ||
2014 | mlog_entry_void(); | |
2015 | ||
10995aa2 JB |
2016 | /* The alloc_bh comes from ocfs2_free_dinode() or |
2017 | * ocfs2_free_clusters(). The callers have all locked the | |
2018 | * allocator and gotten alloc_bh from the lock call. This | |
2019 | * validates the dinode buffer. Any corruption that has happended | |
2020 | * is a code bug. */ | |
2021 | BUG_ON(!OCFS2_IS_VALID_DINODE(fe)); | |
ccd979bd MF |
2022 | BUG_ON((count + start_bit) > ocfs2_bits_per_group(cl)); |
2023 | ||
b0697053 MF |
2024 | mlog(0, "%llu: freeing %u bits from group %llu, starting at %u\n", |
2025 | (unsigned long long)OCFS2_I(alloc_inode)->ip_blkno, count, | |
2026 | (unsigned long long)bg_blkno, start_bit); | |
ccd979bd | 2027 | |
68f64d47 JB |
2028 | status = ocfs2_read_group_descriptor(alloc_inode, fe, bg_blkno, |
2029 | &group_bh); | |
ccd979bd MF |
2030 | if (status < 0) { |
2031 | mlog_errno(status); | |
2032 | goto bail; | |
2033 | } | |
ccd979bd | 2034 | group = (struct ocfs2_group_desc *) group_bh->b_data; |
68f64d47 | 2035 | |
ccd979bd MF |
2036 | BUG_ON((count + start_bit) > le16_to_cpu(group->bg_bits)); |
2037 | ||
2038 | status = ocfs2_block_group_clear_bits(handle, alloc_inode, | |
2039 | group, group_bh, | |
b4414eea | 2040 | start_bit, count, undo_fn); |
ccd979bd MF |
2041 | if (status < 0) { |
2042 | mlog_errno(status); | |
2043 | goto bail; | |
2044 | } | |
2045 | ||
0cf2f763 JB |
2046 | status = ocfs2_journal_access_di(handle, INODE_CACHE(alloc_inode), |
2047 | alloc_bh, OCFS2_JOURNAL_ACCESS_WRITE); | |
ccd979bd MF |
2048 | if (status < 0) { |
2049 | mlog_errno(status); | |
2050 | goto bail; | |
2051 | } | |
2052 | ||
2053 | le32_add_cpu(&cl->cl_recs[le16_to_cpu(group->bg_chain)].c_free, | |
2054 | count); | |
2055 | tmp_used = le32_to_cpu(fe->id1.bitmap1.i_used); | |
2056 | fe->id1.bitmap1.i_used = cpu_to_le32(tmp_used - count); | |
ec20cec7 | 2057 | ocfs2_journal_dirty(handle, alloc_bh); |
ccd979bd MF |
2058 | |
2059 | bail: | |
a81cb88b | 2060 | brelse(group_bh); |
ccd979bd MF |
2061 | |
2062 | mlog_exit(status); | |
2063 | return status; | |
2064 | } | |
2065 | ||
b4414eea MF |
2066 | int ocfs2_free_suballoc_bits(handle_t *handle, |
2067 | struct inode *alloc_inode, | |
2068 | struct buffer_head *alloc_bh, | |
2069 | unsigned int start_bit, | |
2070 | u64 bg_blkno, | |
2071 | unsigned int count) | |
2072 | { | |
2073 | return _ocfs2_free_suballoc_bits(handle, alloc_inode, alloc_bh, | |
2074 | start_bit, bg_blkno, count, NULL); | |
2075 | } | |
2076 | ||
1fabe148 | 2077 | int ocfs2_free_dinode(handle_t *handle, |
ccd979bd MF |
2078 | struct inode *inode_alloc_inode, |
2079 | struct buffer_head *inode_alloc_bh, | |
2080 | struct ocfs2_dinode *di) | |
2081 | { | |
2082 | u64 blk = le64_to_cpu(di->i_blkno); | |
2083 | u16 bit = le16_to_cpu(di->i_suballoc_bit); | |
2084 | u64 bg_blkno = ocfs2_which_suballoc_group(blk, bit); | |
2085 | ||
2086 | return ocfs2_free_suballoc_bits(handle, inode_alloc_inode, | |
2087 | inode_alloc_bh, bit, bg_blkno, 1); | |
2088 | } | |
2089 | ||
b4414eea MF |
2090 | static int _ocfs2_free_clusters(handle_t *handle, |
2091 | struct inode *bitmap_inode, | |
2092 | struct buffer_head *bitmap_bh, | |
2093 | u64 start_blk, | |
2094 | unsigned int num_clusters, | |
2095 | void (*undo_fn)(unsigned int bit, | |
2096 | unsigned long *bitmap)) | |
ccd979bd MF |
2097 | { |
2098 | int status; | |
2099 | u16 bg_start_bit; | |
2100 | u64 bg_blkno; | |
2101 | struct ocfs2_dinode *fe; | |
2102 | ||
2103 | /* You can't ever have a contiguous set of clusters | |
2104 | * bigger than a block group bitmap so we never have to worry | |
2105 | * about looping on them. */ | |
2106 | ||
2107 | mlog_entry_void(); | |
2108 | ||
2109 | /* This is expensive. We can safely remove once this stuff has | |
2110 | * gotten tested really well. */ | |
2111 | BUG_ON(start_blk != ocfs2_clusters_to_blocks(bitmap_inode->i_sb, ocfs2_blocks_to_clusters(bitmap_inode->i_sb, start_blk))); | |
2112 | ||
2113 | fe = (struct ocfs2_dinode *) bitmap_bh->b_data; | |
2114 | ||
2115 | ocfs2_block_to_cluster_group(bitmap_inode, start_blk, &bg_blkno, | |
2116 | &bg_start_bit); | |
2117 | ||
b0697053 MF |
2118 | mlog(0, "want to free %u clusters starting at block %llu\n", |
2119 | num_clusters, (unsigned long long)start_blk); | |
2120 | mlog(0, "bg_blkno = %llu, bg_start_bit = %u\n", | |
2121 | (unsigned long long)bg_blkno, bg_start_bit); | |
ccd979bd | 2122 | |
b4414eea MF |
2123 | status = _ocfs2_free_suballoc_bits(handle, bitmap_inode, bitmap_bh, |
2124 | bg_start_bit, bg_blkno, | |
2125 | num_clusters, undo_fn); | |
9c7af40b | 2126 | if (status < 0) { |
ccd979bd | 2127 | mlog_errno(status); |
9c7af40b MF |
2128 | goto out; |
2129 | } | |
2130 | ||
2131 | ocfs2_local_alloc_seen_free_bits(OCFS2_SB(bitmap_inode->i_sb), | |
2132 | num_clusters); | |
ccd979bd | 2133 | |
9c7af40b | 2134 | out: |
ccd979bd MF |
2135 | mlog_exit(status); |
2136 | return status; | |
2137 | } | |
2138 | ||
b4414eea MF |
2139 | int ocfs2_free_clusters(handle_t *handle, |
2140 | struct inode *bitmap_inode, | |
2141 | struct buffer_head *bitmap_bh, | |
2142 | u64 start_blk, | |
2143 | unsigned int num_clusters) | |
2144 | { | |
2145 | return _ocfs2_free_clusters(handle, bitmap_inode, bitmap_bh, | |
2146 | start_blk, num_clusters, | |
2147 | _ocfs2_set_bit); | |
2148 | } | |
2149 | ||
2150 | /* | |
2151 | * Give never-used clusters back to the global bitmap. We don't need | |
2152 | * to protect these bits in the undo buffer. | |
2153 | */ | |
2154 | int ocfs2_release_clusters(handle_t *handle, | |
2155 | struct inode *bitmap_inode, | |
2156 | struct buffer_head *bitmap_bh, | |
2157 | u64 start_blk, | |
2158 | unsigned int num_clusters) | |
2159 | { | |
2160 | return _ocfs2_free_clusters(handle, bitmap_inode, bitmap_bh, | |
2161 | start_blk, num_clusters, | |
2162 | _ocfs2_clear_bit); | |
2163 | } | |
2164 | ||
ccd979bd MF |
2165 | static inline void ocfs2_debug_bg(struct ocfs2_group_desc *bg) |
2166 | { | |
2167 | printk("Block Group:\n"); | |
2168 | printk("bg_signature: %s\n", bg->bg_signature); | |
2169 | printk("bg_size: %u\n", bg->bg_size); | |
2170 | printk("bg_bits: %u\n", bg->bg_bits); | |
2171 | printk("bg_free_bits_count: %u\n", bg->bg_free_bits_count); | |
2172 | printk("bg_chain: %u\n", bg->bg_chain); | |
2173 | printk("bg_generation: %u\n", le32_to_cpu(bg->bg_generation)); | |
b0697053 MF |
2174 | printk("bg_next_group: %llu\n", |
2175 | (unsigned long long)bg->bg_next_group); | |
2176 | printk("bg_parent_dinode: %llu\n", | |
2177 | (unsigned long long)bg->bg_parent_dinode); | |
2178 | printk("bg_blkno: %llu\n", | |
2179 | (unsigned long long)bg->bg_blkno); | |
ccd979bd MF |
2180 | } |
2181 | ||
2182 | static inline void ocfs2_debug_suballoc_inode(struct ocfs2_dinode *fe) | |
2183 | { | |
2184 | int i; | |
2185 | ||
b0697053 | 2186 | printk("Suballoc Inode %llu:\n", (unsigned long long)fe->i_blkno); |
ccd979bd | 2187 | printk("i_signature: %s\n", fe->i_signature); |
b0697053 MF |
2188 | printk("i_size: %llu\n", |
2189 | (unsigned long long)fe->i_size); | |
ccd979bd MF |
2190 | printk("i_clusters: %u\n", fe->i_clusters); |
2191 | printk("i_generation: %u\n", | |
2192 | le32_to_cpu(fe->i_generation)); | |
2193 | printk("id1.bitmap1.i_used: %u\n", | |
2194 | le32_to_cpu(fe->id1.bitmap1.i_used)); | |
2195 | printk("id1.bitmap1.i_total: %u\n", | |
2196 | le32_to_cpu(fe->id1.bitmap1.i_total)); | |
2197 | printk("id2.i_chain.cl_cpg: %u\n", fe->id2.i_chain.cl_cpg); | |
2198 | printk("id2.i_chain.cl_bpc: %u\n", fe->id2.i_chain.cl_bpc); | |
2199 | printk("id2.i_chain.cl_count: %u\n", fe->id2.i_chain.cl_count); | |
2200 | printk("id2.i_chain.cl_next_free_rec: %u\n", | |
2201 | fe->id2.i_chain.cl_next_free_rec); | |
2202 | for(i = 0; i < fe->id2.i_chain.cl_next_free_rec; i++) { | |
2203 | printk("fe->id2.i_chain.cl_recs[%d].c_free: %u\n", i, | |
2204 | fe->id2.i_chain.cl_recs[i].c_free); | |
2205 | printk("fe->id2.i_chain.cl_recs[%d].c_total: %u\n", i, | |
2206 | fe->id2.i_chain.cl_recs[i].c_total); | |
b0697053 MF |
2207 | printk("fe->id2.i_chain.cl_recs[%d].c_blkno: %llu\n", i, |
2208 | (unsigned long long)fe->id2.i_chain.cl_recs[i].c_blkno); | |
ccd979bd MF |
2209 | } |
2210 | } | |
e7d4cb6b TM |
2211 | |
2212 | /* | |
2213 | * For a given allocation, determine which allocators will need to be | |
2214 | * accessed, and lock them, reserving the appropriate number of bits. | |
2215 | * | |
2216 | * Sparse file systems call this from ocfs2_write_begin_nolock() | |
2217 | * and ocfs2_allocate_unwritten_extents(). | |
2218 | * | |
2219 | * File systems which don't support holes call this from | |
2220 | * ocfs2_extend_allocation(). | |
2221 | */ | |
f99b9b7c JB |
2222 | int ocfs2_lock_allocators(struct inode *inode, |
2223 | struct ocfs2_extent_tree *et, | |
e7d4cb6b TM |
2224 | u32 clusters_to_add, u32 extents_to_split, |
2225 | struct ocfs2_alloc_context **data_ac, | |
f99b9b7c | 2226 | struct ocfs2_alloc_context **meta_ac) |
e7d4cb6b TM |
2227 | { |
2228 | int ret = 0, num_free_extents; | |
2229 | unsigned int max_recs_needed = clusters_to_add + 2 * extents_to_split; | |
2230 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
2231 | ||
2232 | *meta_ac = NULL; | |
2233 | if (data_ac) | |
2234 | *data_ac = NULL; | |
2235 | ||
2236 | BUG_ON(clusters_to_add != 0 && data_ac == NULL); | |
2237 | ||
3d03a305 | 2238 | num_free_extents = ocfs2_num_free_extents(osb, et); |
e7d4cb6b TM |
2239 | if (num_free_extents < 0) { |
2240 | ret = num_free_extents; | |
2241 | mlog_errno(ret); | |
2242 | goto out; | |
2243 | } | |
2244 | ||
2245 | /* | |
2246 | * Sparse allocation file systems need to be more conservative | |
2247 | * with reserving room for expansion - the actual allocation | |
2248 | * happens while we've got a journal handle open so re-taking | |
2249 | * a cluster lock (because we ran out of room for another | |
2250 | * extent) will violate ordering rules. | |
2251 | * | |
2252 | * Most of the time we'll only be seeing this 1 cluster at a time | |
2253 | * anyway. | |
2254 | * | |
2255 | * Always lock for any unwritten extents - we might want to | |
2256 | * add blocks during a split. | |
2257 | */ | |
2258 | if (!num_free_extents || | |
2259 | (ocfs2_sparse_alloc(osb) && num_free_extents < max_recs_needed)) { | |
f99b9b7c | 2260 | ret = ocfs2_reserve_new_metadata(osb, et->et_root_el, meta_ac); |
e7d4cb6b TM |
2261 | if (ret < 0) { |
2262 | if (ret != -ENOSPC) | |
2263 | mlog_errno(ret); | |
2264 | goto out; | |
2265 | } | |
2266 | } | |
2267 | ||
2268 | if (clusters_to_add == 0) | |
2269 | goto out; | |
2270 | ||
2271 | ret = ocfs2_reserve_clusters(osb, clusters_to_add, data_ac); | |
2272 | if (ret < 0) { | |
2273 | if (ret != -ENOSPC) | |
2274 | mlog_errno(ret); | |
2275 | goto out; | |
2276 | } | |
2277 | ||
2278 | out: | |
2279 | if (ret) { | |
2280 | if (*meta_ac) { | |
2281 | ocfs2_free_alloc_context(*meta_ac); | |
2282 | *meta_ac = NULL; | |
2283 | } | |
2284 | ||
2285 | /* | |
2286 | * We cannot have an error and a non null *data_ac. | |
2287 | */ | |
2288 | } | |
2289 | ||
2290 | return ret; | |
2291 | } | |
6ca497a8 | 2292 | |
2293 | /* | |
2294 | * Read the inode specified by blkno to get suballoc_slot and | |
2295 | * suballoc_bit. | |
2296 | */ | |
2297 | static int ocfs2_get_suballoc_slot_bit(struct ocfs2_super *osb, u64 blkno, | |
2298 | u16 *suballoc_slot, u16 *suballoc_bit) | |
2299 | { | |
2300 | int status; | |
2301 | struct buffer_head *inode_bh = NULL; | |
2302 | struct ocfs2_dinode *inode_fe; | |
2303 | ||
5b09b507 | 2304 | mlog_entry("blkno: %llu\n", (unsigned long long)blkno); |
6ca497a8 | 2305 | |
2306 | /* dirty read disk */ | |
2307 | status = ocfs2_read_blocks_sync(osb, blkno, 1, &inode_bh); | |
2308 | if (status < 0) { | |
5b09b507 JB |
2309 | mlog(ML_ERROR, "read block %llu failed %d\n", |
2310 | (unsigned long long)blkno, status); | |
6ca497a8 | 2311 | goto bail; |
2312 | } | |
2313 | ||
2314 | inode_fe = (struct ocfs2_dinode *) inode_bh->b_data; | |
2315 | if (!OCFS2_IS_VALID_DINODE(inode_fe)) { | |
5b09b507 JB |
2316 | mlog(ML_ERROR, "invalid inode %llu requested\n", |
2317 | (unsigned long long)blkno); | |
6ca497a8 | 2318 | status = -EINVAL; |
2319 | goto bail; | |
2320 | } | |
2321 | ||
0fba8137 | 2322 | if (le16_to_cpu(inode_fe->i_suballoc_slot) != (u16)OCFS2_INVALID_SLOT && |
6ca497a8 | 2323 | (u32)le16_to_cpu(inode_fe->i_suballoc_slot) > osb->max_slots - 1) { |
2324 | mlog(ML_ERROR, "inode %llu has invalid suballoc slot %u\n", | |
5b09b507 JB |
2325 | (unsigned long long)blkno, |
2326 | (u32)le16_to_cpu(inode_fe->i_suballoc_slot)); | |
6ca497a8 | 2327 | status = -EINVAL; |
2328 | goto bail; | |
2329 | } | |
2330 | ||
2331 | if (suballoc_slot) | |
2332 | *suballoc_slot = le16_to_cpu(inode_fe->i_suballoc_slot); | |
2333 | if (suballoc_bit) | |
2334 | *suballoc_bit = le16_to_cpu(inode_fe->i_suballoc_bit); | |
2335 | ||
2336 | bail: | |
2337 | brelse(inode_bh); | |
2338 | ||
2339 | mlog_exit(status); | |
2340 | return status; | |
2341 | } | |
2342 | ||
2343 | /* | |
2344 | * test whether bit is SET in allocator bitmap or not. on success, 0 | |
2345 | * is returned and *res is 1 for SET; 0 otherwise. when fails, errno | |
2346 | * is returned and *res is meaningless. Call this after you have | |
2347 | * cluster locked against suballoc, or you may get a result based on | |
2348 | * non-up2date contents | |
2349 | */ | |
2350 | static int ocfs2_test_suballoc_bit(struct ocfs2_super *osb, | |
2351 | struct inode *suballoc, | |
2352 | struct buffer_head *alloc_bh, u64 blkno, | |
2353 | u16 bit, int *res) | |
2354 | { | |
2355 | struct ocfs2_dinode *alloc_fe; | |
2356 | struct ocfs2_group_desc *group; | |
2357 | struct buffer_head *group_bh = NULL; | |
2358 | u64 bg_blkno; | |
2359 | int status; | |
2360 | ||
5b09b507 JB |
2361 | mlog_entry("blkno: %llu bit: %u\n", (unsigned long long)blkno, |
2362 | (unsigned int)bit); | |
6ca497a8 | 2363 | |
2364 | alloc_fe = (struct ocfs2_dinode *)alloc_bh->b_data; | |
2365 | if ((bit + 1) > ocfs2_bits_per_group(&alloc_fe->id2.i_chain)) { | |
2366 | mlog(ML_ERROR, "suballoc bit %u out of range of %u\n", | |
2367 | (unsigned int)bit, | |
2368 | ocfs2_bits_per_group(&alloc_fe->id2.i_chain)); | |
2369 | status = -EINVAL; | |
2370 | goto bail; | |
2371 | } | |
2372 | ||
2373 | bg_blkno = ocfs2_which_suballoc_group(blkno, bit); | |
2374 | status = ocfs2_read_group_descriptor(suballoc, alloc_fe, bg_blkno, | |
2375 | &group_bh); | |
2376 | if (status < 0) { | |
5b09b507 JB |
2377 | mlog(ML_ERROR, "read group %llu failed %d\n", |
2378 | (unsigned long long)bg_blkno, status); | |
6ca497a8 | 2379 | goto bail; |
2380 | } | |
2381 | ||
2382 | group = (struct ocfs2_group_desc *) group_bh->b_data; | |
2383 | *res = ocfs2_test_bit(bit, (unsigned long *)group->bg_bitmap); | |
2384 | ||
2385 | bail: | |
2386 | brelse(group_bh); | |
2387 | ||
2388 | mlog_exit(status); | |
2389 | return status; | |
2390 | } | |
2391 | ||
2392 | /* | |
2393 | * Test if the bit representing this inode (blkno) is set in the | |
2394 | * suballocator. | |
2395 | * | |
2396 | * On success, 0 is returned and *res is 1 for SET; 0 otherwise. | |
2397 | * | |
2398 | * In the event of failure, a negative value is returned and *res is | |
2399 | * meaningless. | |
2400 | * | |
2401 | * Callers must make sure to hold nfs_sync_lock to prevent | |
2402 | * ocfs2_delete_inode() on another node from accessing the same | |
2403 | * suballocator concurrently. | |
2404 | */ | |
2405 | int ocfs2_test_inode_bit(struct ocfs2_super *osb, u64 blkno, int *res) | |
2406 | { | |
2407 | int status; | |
2408 | u16 suballoc_bit = 0, suballoc_slot = 0; | |
2409 | struct inode *inode_alloc_inode; | |
2410 | struct buffer_head *alloc_bh = NULL; | |
2411 | ||
5b09b507 | 2412 | mlog_entry("blkno: %llu", (unsigned long long)blkno); |
6ca497a8 | 2413 | |
2414 | status = ocfs2_get_suballoc_slot_bit(osb, blkno, &suballoc_slot, | |
2415 | &suballoc_bit); | |
2416 | if (status < 0) { | |
2417 | mlog(ML_ERROR, "get alloc slot and bit failed %d\n", status); | |
2418 | goto bail; | |
2419 | } | |
2420 | ||
2421 | inode_alloc_inode = | |
2422 | ocfs2_get_system_file_inode(osb, INODE_ALLOC_SYSTEM_INODE, | |
2423 | suballoc_slot); | |
2424 | if (!inode_alloc_inode) { | |
2425 | /* the error code could be inaccurate, but we are not able to | |
2426 | * get the correct one. */ | |
2427 | status = -EINVAL; | |
2428 | mlog(ML_ERROR, "unable to get alloc inode in slot %u\n", | |
2429 | (u32)suballoc_slot); | |
2430 | goto bail; | |
2431 | } | |
2432 | ||
2433 | mutex_lock(&inode_alloc_inode->i_mutex); | |
2434 | status = ocfs2_inode_lock(inode_alloc_inode, &alloc_bh, 0); | |
2435 | if (status < 0) { | |
2436 | mutex_unlock(&inode_alloc_inode->i_mutex); | |
2437 | mlog(ML_ERROR, "lock on alloc inode on slot %u failed %d\n", | |
2438 | (u32)suballoc_slot, status); | |
2439 | goto bail; | |
2440 | } | |
2441 | ||
2442 | status = ocfs2_test_suballoc_bit(osb, inode_alloc_inode, alloc_bh, | |
2443 | blkno, suballoc_bit, res); | |
2444 | if (status < 0) | |
2445 | mlog(ML_ERROR, "test suballoc bit failed %d\n", status); | |
2446 | ||
2447 | ocfs2_inode_unlock(inode_alloc_inode, 0); | |
2448 | mutex_unlock(&inode_alloc_inode->i_mutex); | |
2449 | ||
2450 | iput(inode_alloc_inode); | |
2451 | brelse(alloc_bh); | |
2452 | bail: | |
2453 | mlog_exit(status); | |
2454 | return status; | |
2455 | } |