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ccd979bd MF |
1 | /* -*- mode: c; c-basic-offset: 8; -*- |
2 | * vim: noexpandtab sw=8 ts=8 sts=0: | |
3 | * | |
4 | * localalloc.c | |
5 | * | |
6 | * Node local data allocation | |
7 | * | |
8 | * Copyright (C) 2002, 2004 Oracle. All rights reserved. | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public | |
12 | * License as published by the Free Software Foundation; either | |
13 | * version 2 of the License, or (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
18 | * General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public | |
21 | * License along with this program; if not, write to the | |
22 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
23 | * Boston, MA 021110-1307, USA. | |
24 | */ | |
25 | ||
26 | #include <linux/fs.h> | |
27 | #include <linux/types.h> | |
28 | #include <linux/slab.h> | |
29 | #include <linux/highmem.h> | |
30 | #include <linux/bitops.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" | |
13723d00 | 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 | ||
47 | #include "buffer_head_io.h" | |
48 | ||
49 | #define OCFS2_LOCAL_ALLOC(dinode) (&((dinode)->id2.i_lab)) | |
50 | ||
ccd979bd MF |
51 | static u32 ocfs2_local_alloc_count_bits(struct ocfs2_dinode *alloc); |
52 | ||
53 | static int ocfs2_local_alloc_find_clear_bits(struct ocfs2_super *osb, | |
54 | struct ocfs2_dinode *alloc, | |
55 | u32 numbits); | |
56 | ||
57 | static void ocfs2_clear_local_alloc(struct ocfs2_dinode *alloc); | |
58 | ||
59 | static int ocfs2_sync_local_to_main(struct ocfs2_super *osb, | |
1fabe148 | 60 | handle_t *handle, |
ccd979bd MF |
61 | struct ocfs2_dinode *alloc, |
62 | struct inode *main_bm_inode, | |
63 | struct buffer_head *main_bm_bh); | |
64 | ||
65 | static int ocfs2_local_alloc_reserve_for_window(struct ocfs2_super *osb, | |
ccd979bd MF |
66 | struct ocfs2_alloc_context **ac, |
67 | struct inode **bitmap_inode, | |
68 | struct buffer_head **bitmap_bh); | |
69 | ||
70 | static int ocfs2_local_alloc_new_window(struct ocfs2_super *osb, | |
1fabe148 | 71 | handle_t *handle, |
ccd979bd MF |
72 | struct ocfs2_alloc_context *ac); |
73 | ||
74 | static int ocfs2_local_alloc_slide_window(struct ocfs2_super *osb, | |
75 | struct inode *local_alloc_inode); | |
76 | ||
9c7af40b MF |
77 | static inline int ocfs2_la_state_enabled(struct ocfs2_super *osb) |
78 | { | |
79 | return (osb->local_alloc_state == OCFS2_LA_THROTTLED || | |
80 | osb->local_alloc_state == OCFS2_LA_ENABLED); | |
81 | } | |
82 | ||
83 | void ocfs2_local_alloc_seen_free_bits(struct ocfs2_super *osb, | |
84 | unsigned int num_clusters) | |
85 | { | |
86 | spin_lock(&osb->osb_lock); | |
87 | if (osb->local_alloc_state == OCFS2_LA_DISABLED || | |
88 | osb->local_alloc_state == OCFS2_LA_THROTTLED) | |
89 | if (num_clusters >= osb->local_alloc_default_bits) { | |
90 | cancel_delayed_work(&osb->la_enable_wq); | |
91 | osb->local_alloc_state = OCFS2_LA_ENABLED; | |
92 | } | |
93 | spin_unlock(&osb->osb_lock); | |
94 | } | |
95 | ||
96 | void ocfs2_la_enable_worker(struct work_struct *work) | |
97 | { | |
98 | struct ocfs2_super *osb = | |
99 | container_of(work, struct ocfs2_super, | |
100 | la_enable_wq.work); | |
101 | spin_lock(&osb->osb_lock); | |
102 | osb->local_alloc_state = OCFS2_LA_ENABLED; | |
103 | spin_unlock(&osb->osb_lock); | |
104 | } | |
105 | ||
ccd979bd MF |
106 | /* |
107 | * Tell us whether a given allocation should use the local alloc | |
108 | * file. Otherwise, it has to go to the main bitmap. | |
9c7af40b MF |
109 | * |
110 | * This function does semi-dirty reads of local alloc size and state! | |
111 | * This is ok however, as the values are re-checked once under mutex. | |
ccd979bd MF |
112 | */ |
113 | int ocfs2_alloc_should_use_local(struct ocfs2_super *osb, u64 bits) | |
114 | { | |
2fbe8d1e | 115 | int ret = 0; |
9c7af40b MF |
116 | int la_bits; |
117 | ||
118 | spin_lock(&osb->osb_lock); | |
119 | la_bits = osb->local_alloc_bits; | |
ccd979bd | 120 | |
9c7af40b | 121 | if (!ocfs2_la_state_enabled(osb)) |
2fbe8d1e | 122 | goto bail; |
ccd979bd MF |
123 | |
124 | /* la_bits should be at least twice the size (in clusters) of | |
125 | * a new block group. We want to be sure block group | |
126 | * allocations go through the local alloc, so allow an | |
127 | * allocation to take up to half the bitmap. */ | |
128 | if (bits > (la_bits / 2)) | |
2fbe8d1e | 129 | goto bail; |
ccd979bd | 130 | |
2fbe8d1e SM |
131 | ret = 1; |
132 | bail: | |
133 | mlog(0, "state=%d, bits=%llu, la_bits=%d, ret=%d\n", | |
134 | osb->local_alloc_state, (unsigned long long)bits, la_bits, ret); | |
9c7af40b | 135 | spin_unlock(&osb->osb_lock); |
2fbe8d1e | 136 | return ret; |
ccd979bd MF |
137 | } |
138 | ||
139 | int ocfs2_load_local_alloc(struct ocfs2_super *osb) | |
140 | { | |
141 | int status = 0; | |
142 | struct ocfs2_dinode *alloc = NULL; | |
143 | struct buffer_head *alloc_bh = NULL; | |
144 | u32 num_used; | |
145 | struct inode *inode = NULL; | |
146 | struct ocfs2_local_alloc *la; | |
147 | ||
148 | mlog_entry_void(); | |
149 | ||
ebcee4b5 | 150 | if (osb->local_alloc_bits == 0) |
2fbe8d1e SM |
151 | goto bail; |
152 | ||
ebcee4b5 | 153 | if (osb->local_alloc_bits >= osb->bitmap_cpg) { |
2fbe8d1e SM |
154 | mlog(ML_NOTICE, "Requested local alloc window %d is larger " |
155 | "than max possible %u. Using defaults.\n", | |
ebcee4b5 MF |
156 | osb->local_alloc_bits, (osb->bitmap_cpg - 1)); |
157 | osb->local_alloc_bits = | |
158 | ocfs2_megabytes_to_clusters(osb->sb, | |
159 | OCFS2_DEFAULT_LOCAL_ALLOC_SIZE); | |
2fbe8d1e SM |
160 | } |
161 | ||
ccd979bd MF |
162 | /* read the alloc off disk */ |
163 | inode = ocfs2_get_system_file_inode(osb, LOCAL_ALLOC_SYSTEM_INODE, | |
164 | osb->slot_num); | |
165 | if (!inode) { | |
166 | status = -EINVAL; | |
167 | mlog_errno(status); | |
168 | goto bail; | |
169 | } | |
170 | ||
b657c95c JB |
171 | status = ocfs2_read_inode_block_full(inode, &alloc_bh, |
172 | OCFS2_BH_IGNORE_CACHE); | |
ccd979bd MF |
173 | if (status < 0) { |
174 | mlog_errno(status); | |
175 | goto bail; | |
176 | } | |
177 | ||
178 | alloc = (struct ocfs2_dinode *) alloc_bh->b_data; | |
179 | la = OCFS2_LOCAL_ALLOC(alloc); | |
180 | ||
181 | if (!(le32_to_cpu(alloc->i_flags) & | |
182 | (OCFS2_LOCAL_ALLOC_FL|OCFS2_BITMAP_FL))) { | |
b0697053 MF |
183 | mlog(ML_ERROR, "Invalid local alloc inode, %llu\n", |
184 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
ccd979bd MF |
185 | status = -EINVAL; |
186 | goto bail; | |
187 | } | |
188 | ||
189 | if ((la->la_size == 0) || | |
190 | (le16_to_cpu(la->la_size) > ocfs2_local_alloc_size(inode->i_sb))) { | |
191 | mlog(ML_ERROR, "Local alloc size is invalid (la_size = %u)\n", | |
192 | le16_to_cpu(la->la_size)); | |
193 | status = -EINVAL; | |
194 | goto bail; | |
195 | } | |
196 | ||
197 | /* do a little verification. */ | |
198 | num_used = ocfs2_local_alloc_count_bits(alloc); | |
199 | ||
200 | /* hopefully the local alloc has always been recovered before | |
201 | * we load it. */ | |
202 | if (num_used | |
203 | || alloc->id1.bitmap1.i_used | |
204 | || alloc->id1.bitmap1.i_total | |
205 | || la->la_bm_off) | |
206 | mlog(ML_ERROR, "Local alloc hasn't been recovered!\n" | |
207 | "found = %u, set = %u, taken = %u, off = %u\n", | |
208 | num_used, le32_to_cpu(alloc->id1.bitmap1.i_used), | |
209 | le32_to_cpu(alloc->id1.bitmap1.i_total), | |
210 | OCFS2_LOCAL_ALLOC(alloc)->la_bm_off); | |
211 | ||
212 | osb->local_alloc_bh = alloc_bh; | |
213 | osb->local_alloc_state = OCFS2_LA_ENABLED; | |
214 | ||
215 | bail: | |
216 | if (status < 0) | |
a81cb88b | 217 | brelse(alloc_bh); |
ccd979bd MF |
218 | if (inode) |
219 | iput(inode); | |
220 | ||
ebcee4b5 | 221 | mlog(0, "Local alloc window bits = %d\n", osb->local_alloc_bits); |
2fbe8d1e | 222 | |
ccd979bd MF |
223 | mlog_exit(status); |
224 | return status; | |
225 | } | |
226 | ||
227 | /* | |
228 | * return any unused bits to the bitmap and write out a clean | |
229 | * local_alloc. | |
230 | * | |
231 | * local_alloc_bh is optional. If not passed, we will simply use the | |
232 | * one off osb. If you do pass it however, be warned that it *will* be | |
233 | * returned brelse'd and NULL'd out.*/ | |
234 | void ocfs2_shutdown_local_alloc(struct ocfs2_super *osb) | |
235 | { | |
236 | int status; | |
1fabe148 | 237 | handle_t *handle; |
ccd979bd MF |
238 | struct inode *local_alloc_inode = NULL; |
239 | struct buffer_head *bh = NULL; | |
240 | struct buffer_head *main_bm_bh = NULL; | |
241 | struct inode *main_bm_inode = NULL; | |
242 | struct ocfs2_dinode *alloc_copy = NULL; | |
243 | struct ocfs2_dinode *alloc = NULL; | |
244 | ||
245 | mlog_entry_void(); | |
246 | ||
9c7af40b MF |
247 | cancel_delayed_work(&osb->la_enable_wq); |
248 | flush_workqueue(ocfs2_wq); | |
249 | ||
ccd979bd | 250 | if (osb->local_alloc_state == OCFS2_LA_UNUSED) |
8898a5a5 | 251 | goto out; |
ccd979bd MF |
252 | |
253 | local_alloc_inode = | |
254 | ocfs2_get_system_file_inode(osb, | |
255 | LOCAL_ALLOC_SYSTEM_INODE, | |
256 | osb->slot_num); | |
257 | if (!local_alloc_inode) { | |
258 | status = -ENOENT; | |
259 | mlog_errno(status); | |
8898a5a5 | 260 | goto out; |
ccd979bd MF |
261 | } |
262 | ||
263 | osb->local_alloc_state = OCFS2_LA_DISABLED; | |
264 | ||
ccd979bd MF |
265 | main_bm_inode = ocfs2_get_system_file_inode(osb, |
266 | GLOBAL_BITMAP_SYSTEM_INODE, | |
267 | OCFS2_INVALID_SLOT); | |
268 | if (!main_bm_inode) { | |
269 | status = -EINVAL; | |
270 | mlog_errno(status); | |
8898a5a5 | 271 | goto out; |
ccd979bd MF |
272 | } |
273 | ||
8898a5a5 MF |
274 | mutex_lock(&main_bm_inode->i_mutex); |
275 | ||
e63aecb6 | 276 | status = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1); |
ccd979bd MF |
277 | if (status < 0) { |
278 | mlog_errno(status); | |
8898a5a5 | 279 | goto out_mutex; |
ccd979bd MF |
280 | } |
281 | ||
282 | /* WINDOW_MOVE_CREDITS is a bit heavy... */ | |
65eff9cc | 283 | handle = ocfs2_start_trans(osb, OCFS2_WINDOW_MOVE_CREDITS); |
ccd979bd MF |
284 | if (IS_ERR(handle)) { |
285 | mlog_errno(PTR_ERR(handle)); | |
286 | handle = NULL; | |
8898a5a5 | 287 | goto out_unlock; |
ccd979bd MF |
288 | } |
289 | ||
290 | bh = osb->local_alloc_bh; | |
291 | alloc = (struct ocfs2_dinode *) bh->b_data; | |
292 | ||
4ba1c5bf | 293 | alloc_copy = kmalloc(bh->b_size, GFP_NOFS); |
ccd979bd MF |
294 | if (!alloc_copy) { |
295 | status = -ENOMEM; | |
8898a5a5 | 296 | goto out_commit; |
ccd979bd MF |
297 | } |
298 | memcpy(alloc_copy, alloc, bh->b_size); | |
299 | ||
13723d00 JB |
300 | status = ocfs2_journal_access_di(handle, local_alloc_inode, bh, |
301 | OCFS2_JOURNAL_ACCESS_WRITE); | |
ccd979bd MF |
302 | if (status < 0) { |
303 | mlog_errno(status); | |
8898a5a5 | 304 | goto out_commit; |
ccd979bd MF |
305 | } |
306 | ||
307 | ocfs2_clear_local_alloc(alloc); | |
308 | ||
309 | status = ocfs2_journal_dirty(handle, bh); | |
310 | if (status < 0) { | |
311 | mlog_errno(status); | |
8898a5a5 | 312 | goto out_commit; |
ccd979bd MF |
313 | } |
314 | ||
315 | brelse(bh); | |
316 | osb->local_alloc_bh = NULL; | |
317 | osb->local_alloc_state = OCFS2_LA_UNUSED; | |
318 | ||
319 | status = ocfs2_sync_local_to_main(osb, handle, alloc_copy, | |
320 | main_bm_inode, main_bm_bh); | |
321 | if (status < 0) | |
322 | mlog_errno(status); | |
323 | ||
8898a5a5 | 324 | out_commit: |
02dc1af4 | 325 | ocfs2_commit_trans(osb, handle); |
ccd979bd | 326 | |
8898a5a5 | 327 | out_unlock: |
a81cb88b | 328 | brelse(main_bm_bh); |
ccd979bd | 329 | |
e63aecb6 | 330 | ocfs2_inode_unlock(main_bm_inode, 1); |
ccd979bd | 331 | |
8898a5a5 MF |
332 | out_mutex: |
333 | mutex_unlock(&main_bm_inode->i_mutex); | |
334 | iput(main_bm_inode); | |
335 | ||
336 | out: | |
ccd979bd MF |
337 | if (local_alloc_inode) |
338 | iput(local_alloc_inode); | |
339 | ||
340 | if (alloc_copy) | |
341 | kfree(alloc_copy); | |
342 | ||
343 | mlog_exit_void(); | |
344 | } | |
345 | ||
346 | /* | |
347 | * We want to free the bitmap bits outside of any recovery context as | |
348 | * we'll need a cluster lock to do so, but we must clear the local | |
349 | * alloc before giving up the recovered nodes journal. To solve this, | |
350 | * we kmalloc a copy of the local alloc before it's change for the | |
351 | * caller to process with ocfs2_complete_local_alloc_recovery | |
352 | */ | |
353 | int ocfs2_begin_local_alloc_recovery(struct ocfs2_super *osb, | |
354 | int slot_num, | |
355 | struct ocfs2_dinode **alloc_copy) | |
356 | { | |
357 | int status = 0; | |
358 | struct buffer_head *alloc_bh = NULL; | |
359 | struct inode *inode = NULL; | |
360 | struct ocfs2_dinode *alloc; | |
361 | ||
362 | mlog_entry("(slot_num = %d)\n", slot_num); | |
363 | ||
364 | *alloc_copy = NULL; | |
365 | ||
366 | inode = ocfs2_get_system_file_inode(osb, | |
367 | LOCAL_ALLOC_SYSTEM_INODE, | |
368 | slot_num); | |
369 | if (!inode) { | |
370 | status = -EINVAL; | |
371 | mlog_errno(status); | |
372 | goto bail; | |
373 | } | |
374 | ||
1b1dcc1b | 375 | mutex_lock(&inode->i_mutex); |
ccd979bd | 376 | |
b657c95c JB |
377 | status = ocfs2_read_inode_block_full(inode, &alloc_bh, |
378 | OCFS2_BH_IGNORE_CACHE); | |
ccd979bd MF |
379 | if (status < 0) { |
380 | mlog_errno(status); | |
381 | goto bail; | |
382 | } | |
383 | ||
384 | *alloc_copy = kmalloc(alloc_bh->b_size, GFP_KERNEL); | |
385 | if (!(*alloc_copy)) { | |
386 | status = -ENOMEM; | |
387 | goto bail; | |
388 | } | |
389 | memcpy((*alloc_copy), alloc_bh->b_data, alloc_bh->b_size); | |
390 | ||
391 | alloc = (struct ocfs2_dinode *) alloc_bh->b_data; | |
392 | ocfs2_clear_local_alloc(alloc); | |
393 | ||
13723d00 | 394 | ocfs2_compute_meta_ecc(osb->sb, alloc_bh->b_data, &alloc->i_check); |
ccd979bd MF |
395 | status = ocfs2_write_block(osb, alloc_bh, inode); |
396 | if (status < 0) | |
397 | mlog_errno(status); | |
398 | ||
399 | bail: | |
400 | if ((status < 0) && (*alloc_copy)) { | |
401 | kfree(*alloc_copy); | |
402 | *alloc_copy = NULL; | |
403 | } | |
404 | ||
a81cb88b | 405 | brelse(alloc_bh); |
ccd979bd MF |
406 | |
407 | if (inode) { | |
1b1dcc1b | 408 | mutex_unlock(&inode->i_mutex); |
ccd979bd MF |
409 | iput(inode); |
410 | } | |
411 | ||
412 | mlog_exit(status); | |
413 | return status; | |
414 | } | |
415 | ||
416 | /* | |
417 | * Step 2: By now, we've completed the journal recovery, we've stamped | |
418 | * a clean local alloc on disk and dropped the node out of the | |
419 | * recovery map. Dlm locks will no longer stall, so lets clear out the | |
420 | * main bitmap. | |
421 | */ | |
422 | int ocfs2_complete_local_alloc_recovery(struct ocfs2_super *osb, | |
423 | struct ocfs2_dinode *alloc) | |
424 | { | |
425 | int status; | |
1fabe148 | 426 | handle_t *handle; |
ccd979bd | 427 | struct buffer_head *main_bm_bh = NULL; |
8898a5a5 | 428 | struct inode *main_bm_inode; |
ccd979bd MF |
429 | |
430 | mlog_entry_void(); | |
431 | ||
ccd979bd MF |
432 | main_bm_inode = ocfs2_get_system_file_inode(osb, |
433 | GLOBAL_BITMAP_SYSTEM_INODE, | |
434 | OCFS2_INVALID_SLOT); | |
435 | if (!main_bm_inode) { | |
436 | status = -EINVAL; | |
437 | mlog_errno(status); | |
8898a5a5 | 438 | goto out; |
ccd979bd MF |
439 | } |
440 | ||
8898a5a5 MF |
441 | mutex_lock(&main_bm_inode->i_mutex); |
442 | ||
e63aecb6 | 443 | status = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1); |
ccd979bd MF |
444 | if (status < 0) { |
445 | mlog_errno(status); | |
8898a5a5 | 446 | goto out_mutex; |
ccd979bd MF |
447 | } |
448 | ||
65eff9cc | 449 | handle = ocfs2_start_trans(osb, OCFS2_WINDOW_MOVE_CREDITS); |
ccd979bd MF |
450 | if (IS_ERR(handle)) { |
451 | status = PTR_ERR(handle); | |
452 | handle = NULL; | |
453 | mlog_errno(status); | |
8898a5a5 | 454 | goto out_unlock; |
ccd979bd MF |
455 | } |
456 | ||
457 | /* we want the bitmap change to be recorded on disk asap */ | |
1fabe148 | 458 | handle->h_sync = 1; |
ccd979bd MF |
459 | |
460 | status = ocfs2_sync_local_to_main(osb, handle, alloc, | |
461 | main_bm_inode, main_bm_bh); | |
462 | if (status < 0) | |
463 | mlog_errno(status); | |
464 | ||
02dc1af4 | 465 | ocfs2_commit_trans(osb, handle); |
8898a5a5 MF |
466 | |
467 | out_unlock: | |
e63aecb6 | 468 | ocfs2_inode_unlock(main_bm_inode, 1); |
8898a5a5 MF |
469 | |
470 | out_mutex: | |
471 | mutex_unlock(&main_bm_inode->i_mutex); | |
ccd979bd | 472 | |
a81cb88b | 473 | brelse(main_bm_bh); |
ccd979bd | 474 | |
8898a5a5 | 475 | iput(main_bm_inode); |
ccd979bd | 476 | |
8898a5a5 | 477 | out: |
4d0ddb2c TM |
478 | if (!status) |
479 | ocfs2_init_inode_steal_slot(osb); | |
ccd979bd MF |
480 | mlog_exit(status); |
481 | return status; | |
482 | } | |
483 | ||
1187c968 JB |
484 | /* Check to see if the local alloc window is within ac->ac_max_block */ |
485 | static int ocfs2_local_alloc_in_range(struct inode *inode, | |
486 | struct ocfs2_alloc_context *ac, | |
487 | u32 bits_wanted) | |
488 | { | |
489 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
490 | struct ocfs2_dinode *alloc; | |
491 | struct ocfs2_local_alloc *la; | |
492 | int start; | |
493 | u64 block_off; | |
494 | ||
495 | if (!ac->ac_max_block) | |
496 | return 1; | |
497 | ||
498 | alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data; | |
499 | la = OCFS2_LOCAL_ALLOC(alloc); | |
500 | ||
501 | start = ocfs2_local_alloc_find_clear_bits(osb, alloc, bits_wanted); | |
502 | if (start == -1) { | |
503 | mlog_errno(-ENOSPC); | |
504 | return 0; | |
505 | } | |
506 | ||
507 | /* | |
508 | * Converting (bm_off + start + bits_wanted) to blocks gives us | |
509 | * the blkno just past our actual allocation. This is perfect | |
510 | * to compare with ac_max_block. | |
511 | */ | |
512 | block_off = ocfs2_clusters_to_blocks(inode->i_sb, | |
513 | le32_to_cpu(la->la_bm_off) + | |
514 | start + bits_wanted); | |
515 | mlog(0, "Checking %llu against %llu\n", | |
516 | (unsigned long long)block_off, | |
517 | (unsigned long long)ac->ac_max_block); | |
518 | if (block_off > ac->ac_max_block) | |
519 | return 0; | |
520 | ||
521 | return 1; | |
522 | } | |
523 | ||
ccd979bd | 524 | /* |
9c7af40b | 525 | * make sure we've got at least bits_wanted contiguous bits in the |
1b1dcc1b | 526 | * local alloc. You lose them when you drop i_mutex. |
ccd979bd MF |
527 | * |
528 | * We will add ourselves to the transaction passed in, but may start | |
529 | * our own in order to shift windows. | |
530 | */ | |
531 | int ocfs2_reserve_local_alloc_bits(struct ocfs2_super *osb, | |
ccd979bd MF |
532 | u32 bits_wanted, |
533 | struct ocfs2_alloc_context *ac) | |
534 | { | |
535 | int status; | |
536 | struct ocfs2_dinode *alloc; | |
537 | struct inode *local_alloc_inode; | |
538 | unsigned int free_bits; | |
539 | ||
540 | mlog_entry_void(); | |
541 | ||
ccd979bd | 542 | BUG_ON(!ac); |
ccd979bd MF |
543 | |
544 | local_alloc_inode = | |
545 | ocfs2_get_system_file_inode(osb, | |
546 | LOCAL_ALLOC_SYSTEM_INODE, | |
547 | osb->slot_num); | |
548 | if (!local_alloc_inode) { | |
549 | status = -ENOENT; | |
550 | mlog_errno(status); | |
551 | goto bail; | |
552 | } | |
da5cbf2f MF |
553 | |
554 | mutex_lock(&local_alloc_inode->i_mutex); | |
555 | ||
9c7af40b MF |
556 | /* |
557 | * We must double check state and allocator bits because | |
558 | * another process may have changed them while holding i_mutex. | |
559 | */ | |
560 | spin_lock(&osb->osb_lock); | |
561 | if (!ocfs2_la_state_enabled(osb) || | |
562 | (bits_wanted > osb->local_alloc_bits)) { | |
563 | spin_unlock(&osb->osb_lock); | |
ccd979bd MF |
564 | status = -ENOSPC; |
565 | goto bail; | |
566 | } | |
9c7af40b | 567 | spin_unlock(&osb->osb_lock); |
ccd979bd MF |
568 | |
569 | alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data; | |
570 | ||
e407e397 | 571 | #ifdef CONFIG_OCFS2_DEBUG_FS |
ccd979bd MF |
572 | if (le32_to_cpu(alloc->id1.bitmap1.i_used) != |
573 | ocfs2_local_alloc_count_bits(alloc)) { | |
b0697053 | 574 | ocfs2_error(osb->sb, "local alloc inode %llu says it has " |
ccd979bd | 575 | "%u free bits, but a count shows %u", |
b0697053 | 576 | (unsigned long long)le64_to_cpu(alloc->i_blkno), |
ccd979bd MF |
577 | le32_to_cpu(alloc->id1.bitmap1.i_used), |
578 | ocfs2_local_alloc_count_bits(alloc)); | |
579 | status = -EIO; | |
580 | goto bail; | |
581 | } | |
5a58c3ef | 582 | #endif |
ccd979bd MF |
583 | |
584 | free_bits = le32_to_cpu(alloc->id1.bitmap1.i_total) - | |
585 | le32_to_cpu(alloc->id1.bitmap1.i_used); | |
586 | if (bits_wanted > free_bits) { | |
587 | /* uhoh, window change time. */ | |
588 | status = | |
589 | ocfs2_local_alloc_slide_window(osb, local_alloc_inode); | |
590 | if (status < 0) { | |
591 | if (status != -ENOSPC) | |
592 | mlog_errno(status); | |
593 | goto bail; | |
594 | } | |
9c7af40b MF |
595 | |
596 | /* | |
597 | * Under certain conditions, the window slide code | |
598 | * might have reduced the number of bits available or | |
599 | * disabled the the local alloc entirely. Re-check | |
600 | * here and return -ENOSPC if necessary. | |
601 | */ | |
602 | status = -ENOSPC; | |
603 | if (!ocfs2_la_state_enabled(osb)) | |
604 | goto bail; | |
605 | ||
606 | free_bits = le32_to_cpu(alloc->id1.bitmap1.i_total) - | |
607 | le32_to_cpu(alloc->id1.bitmap1.i_used); | |
608 | if (bits_wanted > free_bits) | |
609 | goto bail; | |
ccd979bd MF |
610 | } |
611 | ||
1187c968 JB |
612 | if (ac->ac_max_block) |
613 | mlog(0, "Calling in_range for max block %llu\n", | |
614 | (unsigned long long)ac->ac_max_block); | |
615 | ||
616 | if (!ocfs2_local_alloc_in_range(local_alloc_inode, ac, | |
617 | bits_wanted)) { | |
618 | /* | |
619 | * The window is outside ac->ac_max_block. | |
620 | * This errno tells the caller to keep localalloc enabled | |
621 | * but to get the allocation from the main bitmap. | |
622 | */ | |
623 | status = -EFBIG; | |
624 | goto bail; | |
625 | } | |
626 | ||
8fccfc82 | 627 | ac->ac_inode = local_alloc_inode; |
a4a48911 TM |
628 | /* We should never use localalloc from another slot */ |
629 | ac->ac_alloc_slot = osb->slot_num; | |
8fccfc82 | 630 | ac->ac_which = OCFS2_AC_USE_LOCAL; |
ccd979bd MF |
631 | get_bh(osb->local_alloc_bh); |
632 | ac->ac_bh = osb->local_alloc_bh; | |
ccd979bd MF |
633 | status = 0; |
634 | bail: | |
bda0233b SM |
635 | if (status < 0 && local_alloc_inode) { |
636 | mutex_unlock(&local_alloc_inode->i_mutex); | |
8fccfc82 | 637 | iput(local_alloc_inode); |
bda0233b | 638 | } |
ccd979bd | 639 | |
2fbe8d1e SM |
640 | mlog(0, "bits=%d, slot=%d, ret=%d\n", bits_wanted, osb->slot_num, |
641 | status); | |
642 | ||
ccd979bd MF |
643 | mlog_exit(status); |
644 | return status; | |
645 | } | |
646 | ||
647 | int ocfs2_claim_local_alloc_bits(struct ocfs2_super *osb, | |
1fabe148 | 648 | handle_t *handle, |
ccd979bd | 649 | struct ocfs2_alloc_context *ac, |
415cb800 | 650 | u32 bits_wanted, |
ccd979bd MF |
651 | u32 *bit_off, |
652 | u32 *num_bits) | |
653 | { | |
654 | int status, start; | |
655 | struct inode *local_alloc_inode; | |
ccd979bd MF |
656 | void *bitmap; |
657 | struct ocfs2_dinode *alloc; | |
658 | struct ocfs2_local_alloc *la; | |
659 | ||
660 | mlog_entry_void(); | |
661 | BUG_ON(ac->ac_which != OCFS2_AC_USE_LOCAL); | |
662 | ||
ccd979bd MF |
663 | local_alloc_inode = ac->ac_inode; |
664 | alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data; | |
665 | la = OCFS2_LOCAL_ALLOC(alloc); | |
666 | ||
667 | start = ocfs2_local_alloc_find_clear_bits(osb, alloc, bits_wanted); | |
668 | if (start == -1) { | |
669 | /* TODO: Shouldn't we just BUG here? */ | |
670 | status = -ENOSPC; | |
671 | mlog_errno(status); | |
672 | goto bail; | |
673 | } | |
674 | ||
675 | bitmap = la->la_bitmap; | |
676 | *bit_off = le32_to_cpu(la->la_bm_off) + start; | |
677 | /* local alloc is always contiguous by nature -- we never | |
678 | * delete bits from it! */ | |
679 | *num_bits = bits_wanted; | |
680 | ||
13723d00 JB |
681 | status = ocfs2_journal_access_di(handle, local_alloc_inode, |
682 | osb->local_alloc_bh, | |
683 | OCFS2_JOURNAL_ACCESS_WRITE); | |
ccd979bd MF |
684 | if (status < 0) { |
685 | mlog_errno(status); | |
686 | goto bail; | |
687 | } | |
688 | ||
689 | while(bits_wanted--) | |
690 | ocfs2_set_bit(start++, bitmap); | |
691 | ||
0dd3256e | 692 | le32_add_cpu(&alloc->id1.bitmap1.i_used, *num_bits); |
ccd979bd MF |
693 | |
694 | status = ocfs2_journal_dirty(handle, osb->local_alloc_bh); | |
695 | if (status < 0) { | |
696 | mlog_errno(status); | |
697 | goto bail; | |
698 | } | |
699 | ||
700 | status = 0; | |
701 | bail: | |
702 | mlog_exit(status); | |
703 | return status; | |
704 | } | |
705 | ||
706 | static u32 ocfs2_local_alloc_count_bits(struct ocfs2_dinode *alloc) | |
707 | { | |
708 | int i; | |
709 | u8 *buffer; | |
710 | u32 count = 0; | |
711 | struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc); | |
712 | ||
713 | mlog_entry_void(); | |
714 | ||
715 | buffer = la->la_bitmap; | |
716 | for (i = 0; i < le16_to_cpu(la->la_size); i++) | |
717 | count += hweight8(buffer[i]); | |
718 | ||
719 | mlog_exit(count); | |
720 | return count; | |
721 | } | |
722 | ||
723 | static int ocfs2_local_alloc_find_clear_bits(struct ocfs2_super *osb, | |
724 | struct ocfs2_dinode *alloc, | |
725 | u32 numbits) | |
726 | { | |
727 | int numfound, bitoff, left, startoff, lastzero; | |
728 | void *bitmap = NULL; | |
729 | ||
730 | mlog_entry("(numbits wanted = %u)\n", numbits); | |
731 | ||
732 | if (!alloc->id1.bitmap1.i_total) { | |
733 | mlog(0, "No bits in my window!\n"); | |
734 | bitoff = -1; | |
735 | goto bail; | |
736 | } | |
737 | ||
738 | bitmap = OCFS2_LOCAL_ALLOC(alloc)->la_bitmap; | |
739 | ||
740 | numfound = bitoff = startoff = 0; | |
741 | lastzero = -1; | |
742 | left = le32_to_cpu(alloc->id1.bitmap1.i_total); | |
743 | while ((bitoff = ocfs2_find_next_zero_bit(bitmap, left, startoff)) != -1) { | |
744 | if (bitoff == left) { | |
745 | /* mlog(0, "bitoff (%d) == left", bitoff); */ | |
746 | break; | |
747 | } | |
748 | /* mlog(0, "Found a zero: bitoff = %d, startoff = %d, " | |
749 | "numfound = %d\n", bitoff, startoff, numfound);*/ | |
750 | ||
751 | /* Ok, we found a zero bit... is it contig. or do we | |
752 | * start over?*/ | |
753 | if (bitoff == startoff) { | |
754 | /* we found a zero */ | |
755 | numfound++; | |
756 | startoff++; | |
757 | } else { | |
758 | /* got a zero after some ones */ | |
759 | numfound = 1; | |
760 | startoff = bitoff+1; | |
761 | } | |
762 | /* we got everything we needed */ | |
763 | if (numfound == numbits) { | |
764 | /* mlog(0, "Found it all!\n"); */ | |
765 | break; | |
766 | } | |
767 | } | |
768 | ||
769 | mlog(0, "Exiting loop, bitoff = %d, numfound = %d\n", bitoff, | |
770 | numfound); | |
771 | ||
772 | if (numfound == numbits) | |
773 | bitoff = startoff - numfound; | |
774 | else | |
775 | bitoff = -1; | |
776 | ||
777 | bail: | |
778 | mlog_exit(bitoff); | |
779 | return bitoff; | |
780 | } | |
781 | ||
782 | static void ocfs2_clear_local_alloc(struct ocfs2_dinode *alloc) | |
783 | { | |
784 | struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc); | |
785 | int i; | |
786 | mlog_entry_void(); | |
787 | ||
788 | alloc->id1.bitmap1.i_total = 0; | |
789 | alloc->id1.bitmap1.i_used = 0; | |
790 | la->la_bm_off = 0; | |
791 | for(i = 0; i < le16_to_cpu(la->la_size); i++) | |
792 | la->la_bitmap[i] = 0; | |
793 | ||
794 | mlog_exit_void(); | |
795 | } | |
796 | ||
797 | #if 0 | |
798 | /* turn this on and uncomment below to aid debugging window shifts. */ | |
799 | static void ocfs2_verify_zero_bits(unsigned long *bitmap, | |
800 | unsigned int start, | |
801 | unsigned int count) | |
802 | { | |
803 | unsigned int tmp = count; | |
804 | while(tmp--) { | |
805 | if (ocfs2_test_bit(start + tmp, bitmap)) { | |
806 | printk("ocfs2_verify_zero_bits: start = %u, count = " | |
807 | "%u\n", start, count); | |
808 | printk("ocfs2_verify_zero_bits: bit %u is set!", | |
809 | start + tmp); | |
810 | BUG(); | |
811 | } | |
812 | } | |
813 | } | |
814 | #endif | |
815 | ||
816 | /* | |
817 | * sync the local alloc to main bitmap. | |
818 | * | |
819 | * assumes you've already locked the main bitmap -- the bitmap inode | |
820 | * passed is used for caching. | |
821 | */ | |
822 | static int ocfs2_sync_local_to_main(struct ocfs2_super *osb, | |
1fabe148 | 823 | handle_t *handle, |
ccd979bd MF |
824 | struct ocfs2_dinode *alloc, |
825 | struct inode *main_bm_inode, | |
826 | struct buffer_head *main_bm_bh) | |
827 | { | |
828 | int status = 0; | |
829 | int bit_off, left, count, start; | |
830 | u64 la_start_blk; | |
831 | u64 blkno; | |
832 | void *bitmap; | |
833 | struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc); | |
834 | ||
5a58c3ef | 835 | mlog_entry("total = %u, used = %u\n", |
ccd979bd | 836 | le32_to_cpu(alloc->id1.bitmap1.i_total), |
ccd979bd MF |
837 | le32_to_cpu(alloc->id1.bitmap1.i_used)); |
838 | ||
839 | if (!alloc->id1.bitmap1.i_total) { | |
840 | mlog(0, "nothing to sync!\n"); | |
841 | goto bail; | |
842 | } | |
843 | ||
844 | if (le32_to_cpu(alloc->id1.bitmap1.i_used) == | |
845 | le32_to_cpu(alloc->id1.bitmap1.i_total)) { | |
846 | mlog(0, "all bits were taken!\n"); | |
847 | goto bail; | |
848 | } | |
849 | ||
850 | la_start_blk = ocfs2_clusters_to_blocks(osb->sb, | |
851 | le32_to_cpu(la->la_bm_off)); | |
852 | bitmap = la->la_bitmap; | |
853 | start = count = bit_off = 0; | |
854 | left = le32_to_cpu(alloc->id1.bitmap1.i_total); | |
855 | ||
856 | while ((bit_off = ocfs2_find_next_zero_bit(bitmap, left, start)) | |
857 | != -1) { | |
858 | if ((bit_off < left) && (bit_off == start)) { | |
859 | count++; | |
860 | start++; | |
861 | continue; | |
862 | } | |
863 | if (count) { | |
864 | blkno = la_start_blk + | |
865 | ocfs2_clusters_to_blocks(osb->sb, | |
866 | start - count); | |
867 | ||
b0697053 MF |
868 | mlog(0, "freeing %u bits starting at local alloc bit " |
869 | "%u (la_start_blk = %llu, blkno = %llu)\n", | |
870 | count, start - count, | |
871 | (unsigned long long)la_start_blk, | |
872 | (unsigned long long)blkno); | |
ccd979bd MF |
873 | |
874 | status = ocfs2_free_clusters(handle, main_bm_inode, | |
875 | main_bm_bh, blkno, count); | |
876 | if (status < 0) { | |
877 | mlog_errno(status); | |
878 | goto bail; | |
879 | } | |
880 | } | |
881 | if (bit_off >= left) | |
882 | break; | |
883 | count = 1; | |
884 | start = bit_off + 1; | |
885 | } | |
886 | ||
887 | bail: | |
888 | mlog_exit(status); | |
889 | return status; | |
890 | } | |
891 | ||
9c7af40b MF |
892 | enum ocfs2_la_event { |
893 | OCFS2_LA_EVENT_SLIDE, /* Normal window slide. */ | |
894 | OCFS2_LA_EVENT_FRAGMENTED, /* The global bitmap has | |
895 | * enough bits theoretically | |
896 | * free, but a contiguous | |
897 | * allocation could not be | |
898 | * found. */ | |
899 | OCFS2_LA_EVENT_ENOSPC, /* Global bitmap doesn't have | |
900 | * enough bits free to satisfy | |
901 | * our request. */ | |
902 | }; | |
903 | #define OCFS2_LA_ENABLE_INTERVAL (30 * HZ) | |
904 | /* | |
905 | * Given an event, calculate the size of our next local alloc window. | |
906 | * | |
907 | * This should always be called under i_mutex of the local alloc inode | |
908 | * so that local alloc disabling doesn't race with processes trying to | |
909 | * use the allocator. | |
910 | * | |
911 | * Returns the state which the local alloc was left in. This value can | |
912 | * be ignored by some paths. | |
913 | */ | |
914 | static int ocfs2_recalc_la_window(struct ocfs2_super *osb, | |
915 | enum ocfs2_la_event event) | |
916 | { | |
917 | unsigned int bits; | |
918 | int state; | |
919 | ||
920 | spin_lock(&osb->osb_lock); | |
921 | if (osb->local_alloc_state == OCFS2_LA_DISABLED) { | |
922 | WARN_ON_ONCE(osb->local_alloc_state == OCFS2_LA_DISABLED); | |
923 | goto out_unlock; | |
924 | } | |
925 | ||
926 | /* | |
927 | * ENOSPC and fragmentation are treated similarly for now. | |
928 | */ | |
929 | if (event == OCFS2_LA_EVENT_ENOSPC || | |
930 | event == OCFS2_LA_EVENT_FRAGMENTED) { | |
931 | /* | |
932 | * We ran out of contiguous space in the primary | |
933 | * bitmap. Drastically reduce the number of bits used | |
934 | * by local alloc until we have to disable it. | |
935 | */ | |
936 | bits = osb->local_alloc_bits >> 1; | |
937 | if (bits > ocfs2_megabytes_to_clusters(osb->sb, 1)) { | |
938 | /* | |
939 | * By setting state to THROTTLED, we'll keep | |
940 | * the number of local alloc bits used down | |
941 | * until an event occurs which would give us | |
942 | * reason to assume the bitmap situation might | |
943 | * have changed. | |
944 | */ | |
945 | osb->local_alloc_state = OCFS2_LA_THROTTLED; | |
946 | osb->local_alloc_bits = bits; | |
947 | } else { | |
948 | osb->local_alloc_state = OCFS2_LA_DISABLED; | |
949 | } | |
950 | queue_delayed_work(ocfs2_wq, &osb->la_enable_wq, | |
951 | OCFS2_LA_ENABLE_INTERVAL); | |
952 | goto out_unlock; | |
953 | } | |
954 | ||
955 | /* | |
956 | * Don't increase the size of the local alloc window until we | |
957 | * know we might be able to fulfill the request. Otherwise, we | |
958 | * risk bouncing around the global bitmap during periods of | |
959 | * low space. | |
960 | */ | |
961 | if (osb->local_alloc_state != OCFS2_LA_THROTTLED) | |
962 | osb->local_alloc_bits = osb->local_alloc_default_bits; | |
963 | ||
964 | out_unlock: | |
965 | state = osb->local_alloc_state; | |
966 | spin_unlock(&osb->osb_lock); | |
967 | ||
968 | return state; | |
969 | } | |
970 | ||
ccd979bd | 971 | static int ocfs2_local_alloc_reserve_for_window(struct ocfs2_super *osb, |
ccd979bd MF |
972 | struct ocfs2_alloc_context **ac, |
973 | struct inode **bitmap_inode, | |
974 | struct buffer_head **bitmap_bh) | |
975 | { | |
976 | int status; | |
977 | ||
cd861280 | 978 | *ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL); |
ccd979bd MF |
979 | if (!(*ac)) { |
980 | status = -ENOMEM; | |
981 | mlog_errno(status); | |
982 | goto bail; | |
983 | } | |
984 | ||
9c7af40b | 985 | retry_enospc: |
ebcee4b5 | 986 | (*ac)->ac_bits_wanted = osb->local_alloc_bits; |
ccd979bd MF |
987 | |
988 | status = ocfs2_reserve_cluster_bitmap_bits(osb, *ac); | |
9c7af40b MF |
989 | if (status == -ENOSPC) { |
990 | if (ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_ENOSPC) == | |
991 | OCFS2_LA_DISABLED) | |
992 | goto bail; | |
993 | ||
994 | ocfs2_free_ac_resource(*ac); | |
995 | memset(*ac, 0, sizeof(struct ocfs2_alloc_context)); | |
996 | goto retry_enospc; | |
997 | } | |
ccd979bd | 998 | if (status < 0) { |
9c7af40b | 999 | mlog_errno(status); |
ccd979bd MF |
1000 | goto bail; |
1001 | } | |
1002 | ||
1003 | *bitmap_inode = (*ac)->ac_inode; | |
1004 | igrab(*bitmap_inode); | |
1005 | *bitmap_bh = (*ac)->ac_bh; | |
1006 | get_bh(*bitmap_bh); | |
1007 | status = 0; | |
1008 | bail: | |
1009 | if ((status < 0) && *ac) { | |
1010 | ocfs2_free_alloc_context(*ac); | |
1011 | *ac = NULL; | |
1012 | } | |
1013 | ||
1014 | mlog_exit(status); | |
1015 | return status; | |
1016 | } | |
1017 | ||
1018 | /* | |
1019 | * pass it the bitmap lock in lock_bh if you have it. | |
1020 | */ | |
1021 | static int ocfs2_local_alloc_new_window(struct ocfs2_super *osb, | |
1fabe148 | 1022 | handle_t *handle, |
ccd979bd MF |
1023 | struct ocfs2_alloc_context *ac) |
1024 | { | |
1025 | int status = 0; | |
1026 | u32 cluster_off, cluster_count; | |
1027 | struct ocfs2_dinode *alloc = NULL; | |
1028 | struct ocfs2_local_alloc *la; | |
1029 | ||
1030 | mlog_entry_void(); | |
1031 | ||
1032 | alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data; | |
1033 | la = OCFS2_LOCAL_ALLOC(alloc); | |
1034 | ||
1035 | if (alloc->id1.bitmap1.i_total) | |
1036 | mlog(0, "asking me to alloc a new window over a non-empty " | |
1037 | "one\n"); | |
1038 | ||
1039 | mlog(0, "Allocating %u clusters for a new window.\n", | |
ebcee4b5 | 1040 | osb->local_alloc_bits); |
883d4cae MF |
1041 | |
1042 | /* Instruct the allocation code to try the most recently used | |
1043 | * cluster group. We'll re-record the group used this pass | |
1044 | * below. */ | |
1045 | ac->ac_last_group = osb->la_last_gd; | |
1046 | ||
ccd979bd MF |
1047 | /* we used the generic suballoc reserve function, but we set |
1048 | * everything up nicely, so there's no reason why we can't use | |
1049 | * the more specific cluster api to claim bits. */ | |
ebcee4b5 | 1050 | status = ocfs2_claim_clusters(osb, handle, ac, osb->local_alloc_bits, |
ccd979bd | 1051 | &cluster_off, &cluster_count); |
9c7af40b MF |
1052 | if (status == -ENOSPC) { |
1053 | retry_enospc: | |
1054 | /* | |
1055 | * Note: We could also try syncing the journal here to | |
1056 | * allow use of any free bits which the current | |
1057 | * transaction can't give us access to. --Mark | |
1058 | */ | |
1059 | if (ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_FRAGMENTED) == | |
1060 | OCFS2_LA_DISABLED) | |
1061 | goto bail; | |
1062 | ||
1063 | status = ocfs2_claim_clusters(osb, handle, ac, | |
1064 | osb->local_alloc_bits, | |
1065 | &cluster_off, | |
1066 | &cluster_count); | |
1067 | if (status == -ENOSPC) | |
1068 | goto retry_enospc; | |
1069 | /* | |
1070 | * We only shrunk the *minimum* number of in our | |
1071 | * request - it's entirely possible that the allocator | |
1072 | * might give us more than we asked for. | |
1073 | */ | |
1074 | if (status == 0) { | |
1075 | spin_lock(&osb->osb_lock); | |
1076 | osb->local_alloc_bits = cluster_count; | |
1077 | spin_unlock(&osb->osb_lock); | |
1078 | } | |
1079 | } | |
ccd979bd MF |
1080 | if (status < 0) { |
1081 | if (status != -ENOSPC) | |
1082 | mlog_errno(status); | |
1083 | goto bail; | |
1084 | } | |
1085 | ||
883d4cae MF |
1086 | osb->la_last_gd = ac->ac_last_group; |
1087 | ||
ccd979bd MF |
1088 | la->la_bm_off = cpu_to_le32(cluster_off); |
1089 | alloc->id1.bitmap1.i_total = cpu_to_le32(cluster_count); | |
1090 | /* just in case... In the future when we find space ourselves, | |
1091 | * we don't have to get all contiguous -- but we'll have to | |
1092 | * set all previously used bits in bitmap and update | |
1093 | * la_bits_set before setting the bits in the main bitmap. */ | |
1094 | alloc->id1.bitmap1.i_used = 0; | |
1095 | memset(OCFS2_LOCAL_ALLOC(alloc)->la_bitmap, 0, | |
1096 | le16_to_cpu(la->la_size)); | |
1097 | ||
1098 | mlog(0, "New window allocated:\n"); | |
1099 | mlog(0, "window la_bm_off = %u\n", | |
1100 | OCFS2_LOCAL_ALLOC(alloc)->la_bm_off); | |
1101 | mlog(0, "window bits = %u\n", le32_to_cpu(alloc->id1.bitmap1.i_total)); | |
1102 | ||
1103 | bail: | |
1104 | mlog_exit(status); | |
1105 | return status; | |
1106 | } | |
1107 | ||
1108 | /* Note that we do *NOT* lock the local alloc inode here as | |
1109 | * it's been locked already for us. */ | |
1110 | static int ocfs2_local_alloc_slide_window(struct ocfs2_super *osb, | |
1111 | struct inode *local_alloc_inode) | |
1112 | { | |
1113 | int status = 0; | |
1114 | struct buffer_head *main_bm_bh = NULL; | |
1115 | struct inode *main_bm_inode = NULL; | |
1fabe148 | 1116 | handle_t *handle = NULL; |
ccd979bd MF |
1117 | struct ocfs2_dinode *alloc; |
1118 | struct ocfs2_dinode *alloc_copy = NULL; | |
1119 | struct ocfs2_alloc_context *ac = NULL; | |
1120 | ||
1121 | mlog_entry_void(); | |
1122 | ||
9c7af40b MF |
1123 | ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_SLIDE); |
1124 | ||
ccd979bd MF |
1125 | /* This will lock the main bitmap for us. */ |
1126 | status = ocfs2_local_alloc_reserve_for_window(osb, | |
ccd979bd MF |
1127 | &ac, |
1128 | &main_bm_inode, | |
1129 | &main_bm_bh); | |
1130 | if (status < 0) { | |
1131 | if (status != -ENOSPC) | |
1132 | mlog_errno(status); | |
1133 | goto bail; | |
1134 | } | |
1135 | ||
65eff9cc | 1136 | handle = ocfs2_start_trans(osb, OCFS2_WINDOW_MOVE_CREDITS); |
ccd979bd MF |
1137 | if (IS_ERR(handle)) { |
1138 | status = PTR_ERR(handle); | |
1139 | handle = NULL; | |
1140 | mlog_errno(status); | |
1141 | goto bail; | |
1142 | } | |
1143 | ||
1144 | alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data; | |
1145 | ||
1146 | /* We want to clear the local alloc before doing anything | |
1147 | * else, so that if we error later during this operation, | |
1148 | * local alloc shutdown won't try to double free main bitmap | |
1149 | * bits. Make a copy so the sync function knows which bits to | |
1150 | * free. */ | |
4ba1c5bf | 1151 | alloc_copy = kmalloc(osb->local_alloc_bh->b_size, GFP_NOFS); |
ccd979bd MF |
1152 | if (!alloc_copy) { |
1153 | status = -ENOMEM; | |
1154 | mlog_errno(status); | |
1155 | goto bail; | |
1156 | } | |
1157 | memcpy(alloc_copy, alloc, osb->local_alloc_bh->b_size); | |
1158 | ||
13723d00 JB |
1159 | status = ocfs2_journal_access_di(handle, local_alloc_inode, |
1160 | osb->local_alloc_bh, | |
1161 | OCFS2_JOURNAL_ACCESS_WRITE); | |
ccd979bd MF |
1162 | if (status < 0) { |
1163 | mlog_errno(status); | |
1164 | goto bail; | |
1165 | } | |
1166 | ||
1167 | ocfs2_clear_local_alloc(alloc); | |
1168 | ||
1169 | status = ocfs2_journal_dirty(handle, osb->local_alloc_bh); | |
1170 | if (status < 0) { | |
1171 | mlog_errno(status); | |
1172 | goto bail; | |
1173 | } | |
1174 | ||
1175 | status = ocfs2_sync_local_to_main(osb, handle, alloc_copy, | |
1176 | main_bm_inode, main_bm_bh); | |
1177 | if (status < 0) { | |
1178 | mlog_errno(status); | |
1179 | goto bail; | |
1180 | } | |
1181 | ||
1182 | status = ocfs2_local_alloc_new_window(osb, handle, ac); | |
1183 | if (status < 0) { | |
1184 | if (status != -ENOSPC) | |
1185 | mlog_errno(status); | |
1186 | goto bail; | |
1187 | } | |
1188 | ||
1189 | atomic_inc(&osb->alloc_stats.moves); | |
1190 | ||
1191 | status = 0; | |
1192 | bail: | |
1193 | if (handle) | |
02dc1af4 | 1194 | ocfs2_commit_trans(osb, handle); |
ccd979bd | 1195 | |
a81cb88b | 1196 | brelse(main_bm_bh); |
ccd979bd MF |
1197 | |
1198 | if (main_bm_inode) | |
1199 | iput(main_bm_inode); | |
1200 | ||
1201 | if (alloc_copy) | |
1202 | kfree(alloc_copy); | |
1203 | ||
1204 | if (ac) | |
1205 | ocfs2_free_alloc_context(ac); | |
1206 | ||
1207 | mlog_exit(status); | |
1208 | return status; | |
1209 | } | |
1210 |