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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" | |
38 | #include "dlmglue.h" | |
39 | #include "inode.h" | |
40 | #include "journal.h" | |
41 | #include "localalloc.h" | |
42 | #include "suballoc.h" | |
43 | #include "super.h" | |
44 | #include "sysfile.h" | |
45 | ||
46 | #include "buffer_head_io.h" | |
47 | ||
48 | #define OCFS2_LOCAL_ALLOC(dinode) (&((dinode)->id2.i_lab)) | |
49 | ||
50 | static inline int ocfs2_local_alloc_window_bits(struct ocfs2_super *osb); | |
51 | ||
52 | static u32 ocfs2_local_alloc_count_bits(struct ocfs2_dinode *alloc); | |
53 | ||
54 | static int ocfs2_local_alloc_find_clear_bits(struct ocfs2_super *osb, | |
55 | struct ocfs2_dinode *alloc, | |
56 | u32 numbits); | |
57 | ||
58 | static void ocfs2_clear_local_alloc(struct ocfs2_dinode *alloc); | |
59 | ||
60 | static int ocfs2_sync_local_to_main(struct ocfs2_super *osb, | |
61 | struct ocfs2_journal_handle *handle, | |
62 | struct ocfs2_dinode *alloc, | |
63 | struct inode *main_bm_inode, | |
64 | struct buffer_head *main_bm_bh); | |
65 | ||
66 | static int ocfs2_local_alloc_reserve_for_window(struct ocfs2_super *osb, | |
67 | struct ocfs2_journal_handle *handle, | |
68 | struct ocfs2_alloc_context **ac, | |
69 | struct inode **bitmap_inode, | |
70 | struct buffer_head **bitmap_bh); | |
71 | ||
72 | static int ocfs2_local_alloc_new_window(struct ocfs2_super *osb, | |
73 | struct ocfs2_journal_handle *handle, | |
74 | struct ocfs2_alloc_context *ac); | |
75 | ||
76 | static int ocfs2_local_alloc_slide_window(struct ocfs2_super *osb, | |
77 | struct inode *local_alloc_inode); | |
78 | ||
79 | /* | |
80 | * Determine how large our local alloc window should be, in bits. | |
81 | * | |
82 | * These values (and the behavior in ocfs2_alloc_should_use_local) have | |
83 | * been chosen so that most allocations, including new block groups go | |
84 | * through local alloc. | |
85 | */ | |
86 | static inline int ocfs2_local_alloc_window_bits(struct ocfs2_super *osb) | |
87 | { | |
88 | BUG_ON(osb->s_clustersize_bits < 12); | |
89 | ||
90 | return 2048 >> (osb->s_clustersize_bits - 12); | |
91 | } | |
92 | ||
93 | /* | |
94 | * Tell us whether a given allocation should use the local alloc | |
95 | * file. Otherwise, it has to go to the main bitmap. | |
96 | */ | |
97 | int ocfs2_alloc_should_use_local(struct ocfs2_super *osb, u64 bits) | |
98 | { | |
99 | int la_bits = ocfs2_local_alloc_window_bits(osb); | |
100 | ||
101 | if (osb->local_alloc_state != OCFS2_LA_ENABLED) | |
102 | return 0; | |
103 | ||
104 | /* la_bits should be at least twice the size (in clusters) of | |
105 | * a new block group. We want to be sure block group | |
106 | * allocations go through the local alloc, so allow an | |
107 | * allocation to take up to half the bitmap. */ | |
108 | if (bits > (la_bits / 2)) | |
109 | return 0; | |
110 | ||
111 | return 1; | |
112 | } | |
113 | ||
114 | int ocfs2_load_local_alloc(struct ocfs2_super *osb) | |
115 | { | |
116 | int status = 0; | |
117 | struct ocfs2_dinode *alloc = NULL; | |
118 | struct buffer_head *alloc_bh = NULL; | |
119 | u32 num_used; | |
120 | struct inode *inode = NULL; | |
121 | struct ocfs2_local_alloc *la; | |
122 | ||
123 | mlog_entry_void(); | |
124 | ||
125 | /* read the alloc off disk */ | |
126 | inode = ocfs2_get_system_file_inode(osb, LOCAL_ALLOC_SYSTEM_INODE, | |
127 | osb->slot_num); | |
128 | if (!inode) { | |
129 | status = -EINVAL; | |
130 | mlog_errno(status); | |
131 | goto bail; | |
132 | } | |
133 | ||
134 | status = ocfs2_read_block(osb, OCFS2_I(inode)->ip_blkno, | |
135 | &alloc_bh, 0, inode); | |
136 | if (status < 0) { | |
137 | mlog_errno(status); | |
138 | goto bail; | |
139 | } | |
140 | ||
141 | alloc = (struct ocfs2_dinode *) alloc_bh->b_data; | |
142 | la = OCFS2_LOCAL_ALLOC(alloc); | |
143 | ||
144 | if (!(le32_to_cpu(alloc->i_flags) & | |
145 | (OCFS2_LOCAL_ALLOC_FL|OCFS2_BITMAP_FL))) { | |
b0697053 MF |
146 | mlog(ML_ERROR, "Invalid local alloc inode, %llu\n", |
147 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
ccd979bd MF |
148 | status = -EINVAL; |
149 | goto bail; | |
150 | } | |
151 | ||
152 | if ((la->la_size == 0) || | |
153 | (le16_to_cpu(la->la_size) > ocfs2_local_alloc_size(inode->i_sb))) { | |
154 | mlog(ML_ERROR, "Local alloc size is invalid (la_size = %u)\n", | |
155 | le16_to_cpu(la->la_size)); | |
156 | status = -EINVAL; | |
157 | goto bail; | |
158 | } | |
159 | ||
160 | /* do a little verification. */ | |
161 | num_used = ocfs2_local_alloc_count_bits(alloc); | |
162 | ||
163 | /* hopefully the local alloc has always been recovered before | |
164 | * we load it. */ | |
165 | if (num_used | |
166 | || alloc->id1.bitmap1.i_used | |
167 | || alloc->id1.bitmap1.i_total | |
168 | || la->la_bm_off) | |
169 | mlog(ML_ERROR, "Local alloc hasn't been recovered!\n" | |
170 | "found = %u, set = %u, taken = %u, off = %u\n", | |
171 | num_used, le32_to_cpu(alloc->id1.bitmap1.i_used), | |
172 | le32_to_cpu(alloc->id1.bitmap1.i_total), | |
173 | OCFS2_LOCAL_ALLOC(alloc)->la_bm_off); | |
174 | ||
175 | osb->local_alloc_bh = alloc_bh; | |
176 | osb->local_alloc_state = OCFS2_LA_ENABLED; | |
177 | ||
178 | bail: | |
179 | if (status < 0) | |
180 | if (alloc_bh) | |
181 | brelse(alloc_bh); | |
182 | if (inode) | |
183 | iput(inode); | |
184 | ||
185 | mlog_exit(status); | |
186 | return status; | |
187 | } | |
188 | ||
189 | /* | |
190 | * return any unused bits to the bitmap and write out a clean | |
191 | * local_alloc. | |
192 | * | |
193 | * local_alloc_bh is optional. If not passed, we will simply use the | |
194 | * one off osb. If you do pass it however, be warned that it *will* be | |
195 | * returned brelse'd and NULL'd out.*/ | |
196 | void ocfs2_shutdown_local_alloc(struct ocfs2_super *osb) | |
197 | { | |
198 | int status; | |
199 | struct ocfs2_journal_handle *handle = NULL; | |
200 | struct inode *local_alloc_inode = NULL; | |
201 | struct buffer_head *bh = NULL; | |
202 | struct buffer_head *main_bm_bh = NULL; | |
203 | struct inode *main_bm_inode = NULL; | |
204 | struct ocfs2_dinode *alloc_copy = NULL; | |
205 | struct ocfs2_dinode *alloc = NULL; | |
206 | ||
207 | mlog_entry_void(); | |
208 | ||
209 | if (osb->local_alloc_state == OCFS2_LA_UNUSED) | |
210 | goto bail; | |
211 | ||
212 | local_alloc_inode = | |
213 | ocfs2_get_system_file_inode(osb, | |
214 | LOCAL_ALLOC_SYSTEM_INODE, | |
215 | osb->slot_num); | |
216 | if (!local_alloc_inode) { | |
217 | status = -ENOENT; | |
218 | mlog_errno(status); | |
219 | goto bail; | |
220 | } | |
221 | ||
222 | osb->local_alloc_state = OCFS2_LA_DISABLED; | |
223 | ||
224 | handle = ocfs2_alloc_handle(osb); | |
225 | if (!handle) { | |
226 | status = -ENOMEM; | |
227 | mlog_errno(status); | |
228 | goto bail; | |
229 | } | |
230 | ||
231 | main_bm_inode = ocfs2_get_system_file_inode(osb, | |
232 | GLOBAL_BITMAP_SYSTEM_INODE, | |
233 | OCFS2_INVALID_SLOT); | |
234 | if (!main_bm_inode) { | |
235 | status = -EINVAL; | |
236 | mlog_errno(status); | |
237 | goto bail; | |
238 | } | |
239 | ||
240 | ocfs2_handle_add_inode(handle, main_bm_inode); | |
241 | status = ocfs2_meta_lock(main_bm_inode, handle, &main_bm_bh, 1); | |
242 | if (status < 0) { | |
243 | mlog_errno(status); | |
244 | goto bail; | |
245 | } | |
246 | ||
247 | /* WINDOW_MOVE_CREDITS is a bit heavy... */ | |
248 | handle = ocfs2_start_trans(osb, handle, OCFS2_WINDOW_MOVE_CREDITS); | |
249 | if (IS_ERR(handle)) { | |
250 | mlog_errno(PTR_ERR(handle)); | |
251 | handle = NULL; | |
252 | goto bail; | |
253 | } | |
254 | ||
255 | bh = osb->local_alloc_bh; | |
256 | alloc = (struct ocfs2_dinode *) bh->b_data; | |
257 | ||
258 | alloc_copy = kmalloc(bh->b_size, GFP_KERNEL); | |
259 | if (!alloc_copy) { | |
260 | status = -ENOMEM; | |
261 | goto bail; | |
262 | } | |
263 | memcpy(alloc_copy, alloc, bh->b_size); | |
264 | ||
265 | status = ocfs2_journal_access(handle, local_alloc_inode, bh, | |
266 | OCFS2_JOURNAL_ACCESS_WRITE); | |
267 | if (status < 0) { | |
268 | mlog_errno(status); | |
269 | goto bail; | |
270 | } | |
271 | ||
272 | ocfs2_clear_local_alloc(alloc); | |
273 | ||
274 | status = ocfs2_journal_dirty(handle, bh); | |
275 | if (status < 0) { | |
276 | mlog_errno(status); | |
277 | goto bail; | |
278 | } | |
279 | ||
280 | brelse(bh); | |
281 | osb->local_alloc_bh = NULL; | |
282 | osb->local_alloc_state = OCFS2_LA_UNUSED; | |
283 | ||
284 | status = ocfs2_sync_local_to_main(osb, handle, alloc_copy, | |
285 | main_bm_inode, main_bm_bh); | |
286 | if (status < 0) | |
287 | mlog_errno(status); | |
288 | ||
289 | bail: | |
290 | if (handle) | |
291 | ocfs2_commit_trans(handle); | |
292 | ||
293 | if (main_bm_bh) | |
294 | brelse(main_bm_bh); | |
295 | ||
296 | if (main_bm_inode) | |
297 | iput(main_bm_inode); | |
298 | ||
299 | if (local_alloc_inode) | |
300 | iput(local_alloc_inode); | |
301 | ||
302 | if (alloc_copy) | |
303 | kfree(alloc_copy); | |
304 | ||
305 | mlog_exit_void(); | |
306 | } | |
307 | ||
308 | /* | |
309 | * We want to free the bitmap bits outside of any recovery context as | |
310 | * we'll need a cluster lock to do so, but we must clear the local | |
311 | * alloc before giving up the recovered nodes journal. To solve this, | |
312 | * we kmalloc a copy of the local alloc before it's change for the | |
313 | * caller to process with ocfs2_complete_local_alloc_recovery | |
314 | */ | |
315 | int ocfs2_begin_local_alloc_recovery(struct ocfs2_super *osb, | |
316 | int slot_num, | |
317 | struct ocfs2_dinode **alloc_copy) | |
318 | { | |
319 | int status = 0; | |
320 | struct buffer_head *alloc_bh = NULL; | |
321 | struct inode *inode = NULL; | |
322 | struct ocfs2_dinode *alloc; | |
323 | ||
324 | mlog_entry("(slot_num = %d)\n", slot_num); | |
325 | ||
326 | *alloc_copy = NULL; | |
327 | ||
328 | inode = ocfs2_get_system_file_inode(osb, | |
329 | LOCAL_ALLOC_SYSTEM_INODE, | |
330 | slot_num); | |
331 | if (!inode) { | |
332 | status = -EINVAL; | |
333 | mlog_errno(status); | |
334 | goto bail; | |
335 | } | |
336 | ||
1b1dcc1b | 337 | mutex_lock(&inode->i_mutex); |
ccd979bd MF |
338 | |
339 | status = ocfs2_read_block(osb, OCFS2_I(inode)->ip_blkno, | |
340 | &alloc_bh, 0, inode); | |
341 | if (status < 0) { | |
342 | mlog_errno(status); | |
343 | goto bail; | |
344 | } | |
345 | ||
346 | *alloc_copy = kmalloc(alloc_bh->b_size, GFP_KERNEL); | |
347 | if (!(*alloc_copy)) { | |
348 | status = -ENOMEM; | |
349 | goto bail; | |
350 | } | |
351 | memcpy((*alloc_copy), alloc_bh->b_data, alloc_bh->b_size); | |
352 | ||
353 | alloc = (struct ocfs2_dinode *) alloc_bh->b_data; | |
354 | ocfs2_clear_local_alloc(alloc); | |
355 | ||
356 | status = ocfs2_write_block(osb, alloc_bh, inode); | |
357 | if (status < 0) | |
358 | mlog_errno(status); | |
359 | ||
360 | bail: | |
361 | if ((status < 0) && (*alloc_copy)) { | |
362 | kfree(*alloc_copy); | |
363 | *alloc_copy = NULL; | |
364 | } | |
365 | ||
366 | if (alloc_bh) | |
367 | brelse(alloc_bh); | |
368 | ||
369 | if (inode) { | |
1b1dcc1b | 370 | mutex_unlock(&inode->i_mutex); |
ccd979bd MF |
371 | iput(inode); |
372 | } | |
373 | ||
374 | mlog_exit(status); | |
375 | return status; | |
376 | } | |
377 | ||
378 | /* | |
379 | * Step 2: By now, we've completed the journal recovery, we've stamped | |
380 | * a clean local alloc on disk and dropped the node out of the | |
381 | * recovery map. Dlm locks will no longer stall, so lets clear out the | |
382 | * main bitmap. | |
383 | */ | |
384 | int ocfs2_complete_local_alloc_recovery(struct ocfs2_super *osb, | |
385 | struct ocfs2_dinode *alloc) | |
386 | { | |
387 | int status; | |
388 | struct ocfs2_journal_handle *handle = NULL; | |
389 | struct buffer_head *main_bm_bh = NULL; | |
390 | struct inode *main_bm_inode = NULL; | |
391 | ||
392 | mlog_entry_void(); | |
393 | ||
394 | handle = ocfs2_alloc_handle(osb); | |
395 | if (!handle) { | |
396 | status = -ENOMEM; | |
397 | mlog_errno(status); | |
398 | goto bail; | |
399 | } | |
400 | ||
401 | main_bm_inode = ocfs2_get_system_file_inode(osb, | |
402 | GLOBAL_BITMAP_SYSTEM_INODE, | |
403 | OCFS2_INVALID_SLOT); | |
404 | if (!main_bm_inode) { | |
405 | status = -EINVAL; | |
406 | mlog_errno(status); | |
407 | goto bail; | |
408 | } | |
409 | ||
410 | ocfs2_handle_add_inode(handle, main_bm_inode); | |
411 | status = ocfs2_meta_lock(main_bm_inode, handle, &main_bm_bh, 1); | |
412 | if (status < 0) { | |
413 | mlog_errno(status); | |
414 | goto bail; | |
415 | } | |
416 | ||
417 | handle = ocfs2_start_trans(osb, handle, OCFS2_WINDOW_MOVE_CREDITS); | |
418 | if (IS_ERR(handle)) { | |
419 | status = PTR_ERR(handle); | |
420 | handle = NULL; | |
421 | mlog_errno(status); | |
422 | goto bail; | |
423 | } | |
424 | ||
425 | /* we want the bitmap change to be recorded on disk asap */ | |
426 | ocfs2_handle_set_sync(handle, 1); | |
427 | ||
428 | status = ocfs2_sync_local_to_main(osb, handle, alloc, | |
429 | main_bm_inode, main_bm_bh); | |
430 | if (status < 0) | |
431 | mlog_errno(status); | |
432 | ||
433 | bail: | |
434 | if (handle) | |
435 | ocfs2_commit_trans(handle); | |
436 | ||
437 | if (main_bm_bh) | |
438 | brelse(main_bm_bh); | |
439 | ||
440 | if (main_bm_inode) | |
441 | iput(main_bm_inode); | |
442 | ||
443 | mlog_exit(status); | |
444 | return status; | |
445 | } | |
446 | ||
447 | /* | |
448 | * make sure we've got at least bitswanted contiguous bits in the | |
1b1dcc1b | 449 | * local alloc. You lose them when you drop i_mutex. |
ccd979bd MF |
450 | * |
451 | * We will add ourselves to the transaction passed in, but may start | |
452 | * our own in order to shift windows. | |
453 | */ | |
454 | int ocfs2_reserve_local_alloc_bits(struct ocfs2_super *osb, | |
455 | struct ocfs2_journal_handle *passed_handle, | |
456 | u32 bits_wanted, | |
457 | struct ocfs2_alloc_context *ac) | |
458 | { | |
459 | int status; | |
460 | struct ocfs2_dinode *alloc; | |
461 | struct inode *local_alloc_inode; | |
462 | unsigned int free_bits; | |
463 | ||
464 | mlog_entry_void(); | |
465 | ||
466 | BUG_ON(!passed_handle); | |
467 | BUG_ON(!ac); | |
468 | BUG_ON(passed_handle->flags & OCFS2_HANDLE_STARTED); | |
469 | ||
470 | local_alloc_inode = | |
471 | ocfs2_get_system_file_inode(osb, | |
472 | LOCAL_ALLOC_SYSTEM_INODE, | |
473 | osb->slot_num); | |
474 | if (!local_alloc_inode) { | |
475 | status = -ENOENT; | |
476 | mlog_errno(status); | |
477 | goto bail; | |
478 | } | |
479 | ocfs2_handle_add_inode(passed_handle, local_alloc_inode); | |
480 | ||
481 | if (osb->local_alloc_state != OCFS2_LA_ENABLED) { | |
482 | status = -ENOSPC; | |
483 | goto bail; | |
484 | } | |
485 | ||
486 | if (bits_wanted > ocfs2_local_alloc_window_bits(osb)) { | |
487 | mlog(0, "Asking for more than my max window size!\n"); | |
488 | status = -ENOSPC; | |
489 | goto bail; | |
490 | } | |
491 | ||
492 | alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data; | |
493 | ||
494 | if (le32_to_cpu(alloc->id1.bitmap1.i_used) != | |
495 | ocfs2_local_alloc_count_bits(alloc)) { | |
b0697053 | 496 | ocfs2_error(osb->sb, "local alloc inode %llu says it has " |
ccd979bd | 497 | "%u free bits, but a count shows %u", |
b0697053 | 498 | (unsigned long long)le64_to_cpu(alloc->i_blkno), |
ccd979bd MF |
499 | le32_to_cpu(alloc->id1.bitmap1.i_used), |
500 | ocfs2_local_alloc_count_bits(alloc)); | |
501 | status = -EIO; | |
502 | goto bail; | |
503 | } | |
504 | ||
505 | free_bits = le32_to_cpu(alloc->id1.bitmap1.i_total) - | |
506 | le32_to_cpu(alloc->id1.bitmap1.i_used); | |
507 | if (bits_wanted > free_bits) { | |
508 | /* uhoh, window change time. */ | |
509 | status = | |
510 | ocfs2_local_alloc_slide_window(osb, local_alloc_inode); | |
511 | if (status < 0) { | |
512 | if (status != -ENOSPC) | |
513 | mlog_errno(status); | |
514 | goto bail; | |
515 | } | |
516 | } | |
517 | ||
518 | ac->ac_inode = igrab(local_alloc_inode); | |
519 | get_bh(osb->local_alloc_bh); | |
520 | ac->ac_bh = osb->local_alloc_bh; | |
521 | ac->ac_which = OCFS2_AC_USE_LOCAL; | |
522 | status = 0; | |
523 | bail: | |
524 | if (local_alloc_inode) | |
525 | iput(local_alloc_inode); | |
526 | ||
527 | mlog_exit(status); | |
528 | return status; | |
529 | } | |
530 | ||
531 | int ocfs2_claim_local_alloc_bits(struct ocfs2_super *osb, | |
532 | struct ocfs2_journal_handle *handle, | |
533 | struct ocfs2_alloc_context *ac, | |
534 | u32 min_bits, | |
535 | u32 *bit_off, | |
536 | u32 *num_bits) | |
537 | { | |
538 | int status, start; | |
539 | struct inode *local_alloc_inode; | |
540 | u32 bits_wanted; | |
541 | void *bitmap; | |
542 | struct ocfs2_dinode *alloc; | |
543 | struct ocfs2_local_alloc *la; | |
544 | ||
545 | mlog_entry_void(); | |
546 | BUG_ON(ac->ac_which != OCFS2_AC_USE_LOCAL); | |
547 | ||
548 | bits_wanted = ac->ac_bits_wanted - ac->ac_bits_given; | |
549 | local_alloc_inode = ac->ac_inode; | |
550 | alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data; | |
551 | la = OCFS2_LOCAL_ALLOC(alloc); | |
552 | ||
553 | start = ocfs2_local_alloc_find_clear_bits(osb, alloc, bits_wanted); | |
554 | if (start == -1) { | |
555 | /* TODO: Shouldn't we just BUG here? */ | |
556 | status = -ENOSPC; | |
557 | mlog_errno(status); | |
558 | goto bail; | |
559 | } | |
560 | ||
561 | bitmap = la->la_bitmap; | |
562 | *bit_off = le32_to_cpu(la->la_bm_off) + start; | |
563 | /* local alloc is always contiguous by nature -- we never | |
564 | * delete bits from it! */ | |
565 | *num_bits = bits_wanted; | |
566 | ||
567 | status = ocfs2_journal_access(handle, local_alloc_inode, | |
568 | osb->local_alloc_bh, | |
569 | OCFS2_JOURNAL_ACCESS_WRITE); | |
570 | if (status < 0) { | |
571 | mlog_errno(status); | |
572 | goto bail; | |
573 | } | |
574 | ||
575 | while(bits_wanted--) | |
576 | ocfs2_set_bit(start++, bitmap); | |
577 | ||
578 | alloc->id1.bitmap1.i_used = cpu_to_le32(*num_bits + | |
579 | le32_to_cpu(alloc->id1.bitmap1.i_used)); | |
580 | ||
581 | status = ocfs2_journal_dirty(handle, osb->local_alloc_bh); | |
582 | if (status < 0) { | |
583 | mlog_errno(status); | |
584 | goto bail; | |
585 | } | |
586 | ||
587 | status = 0; | |
588 | bail: | |
589 | mlog_exit(status); | |
590 | return status; | |
591 | } | |
592 | ||
593 | static u32 ocfs2_local_alloc_count_bits(struct ocfs2_dinode *alloc) | |
594 | { | |
595 | int i; | |
596 | u8 *buffer; | |
597 | u32 count = 0; | |
598 | struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc); | |
599 | ||
600 | mlog_entry_void(); | |
601 | ||
602 | buffer = la->la_bitmap; | |
603 | for (i = 0; i < le16_to_cpu(la->la_size); i++) | |
604 | count += hweight8(buffer[i]); | |
605 | ||
606 | mlog_exit(count); | |
607 | return count; | |
608 | } | |
609 | ||
610 | static int ocfs2_local_alloc_find_clear_bits(struct ocfs2_super *osb, | |
611 | struct ocfs2_dinode *alloc, | |
612 | u32 numbits) | |
613 | { | |
614 | int numfound, bitoff, left, startoff, lastzero; | |
615 | void *bitmap = NULL; | |
616 | ||
617 | mlog_entry("(numbits wanted = %u)\n", numbits); | |
618 | ||
619 | if (!alloc->id1.bitmap1.i_total) { | |
620 | mlog(0, "No bits in my window!\n"); | |
621 | bitoff = -1; | |
622 | goto bail; | |
623 | } | |
624 | ||
625 | bitmap = OCFS2_LOCAL_ALLOC(alloc)->la_bitmap; | |
626 | ||
627 | numfound = bitoff = startoff = 0; | |
628 | lastzero = -1; | |
629 | left = le32_to_cpu(alloc->id1.bitmap1.i_total); | |
630 | while ((bitoff = ocfs2_find_next_zero_bit(bitmap, left, startoff)) != -1) { | |
631 | if (bitoff == left) { | |
632 | /* mlog(0, "bitoff (%d) == left", bitoff); */ | |
633 | break; | |
634 | } | |
635 | /* mlog(0, "Found a zero: bitoff = %d, startoff = %d, " | |
636 | "numfound = %d\n", bitoff, startoff, numfound);*/ | |
637 | ||
638 | /* Ok, we found a zero bit... is it contig. or do we | |
639 | * start over?*/ | |
640 | if (bitoff == startoff) { | |
641 | /* we found a zero */ | |
642 | numfound++; | |
643 | startoff++; | |
644 | } else { | |
645 | /* got a zero after some ones */ | |
646 | numfound = 1; | |
647 | startoff = bitoff+1; | |
648 | } | |
649 | /* we got everything we needed */ | |
650 | if (numfound == numbits) { | |
651 | /* mlog(0, "Found it all!\n"); */ | |
652 | break; | |
653 | } | |
654 | } | |
655 | ||
656 | mlog(0, "Exiting loop, bitoff = %d, numfound = %d\n", bitoff, | |
657 | numfound); | |
658 | ||
659 | if (numfound == numbits) | |
660 | bitoff = startoff - numfound; | |
661 | else | |
662 | bitoff = -1; | |
663 | ||
664 | bail: | |
665 | mlog_exit(bitoff); | |
666 | return bitoff; | |
667 | } | |
668 | ||
669 | static void ocfs2_clear_local_alloc(struct ocfs2_dinode *alloc) | |
670 | { | |
671 | struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc); | |
672 | int i; | |
673 | mlog_entry_void(); | |
674 | ||
675 | alloc->id1.bitmap1.i_total = 0; | |
676 | alloc->id1.bitmap1.i_used = 0; | |
677 | la->la_bm_off = 0; | |
678 | for(i = 0; i < le16_to_cpu(la->la_size); i++) | |
679 | la->la_bitmap[i] = 0; | |
680 | ||
681 | mlog_exit_void(); | |
682 | } | |
683 | ||
684 | #if 0 | |
685 | /* turn this on and uncomment below to aid debugging window shifts. */ | |
686 | static void ocfs2_verify_zero_bits(unsigned long *bitmap, | |
687 | unsigned int start, | |
688 | unsigned int count) | |
689 | { | |
690 | unsigned int tmp = count; | |
691 | while(tmp--) { | |
692 | if (ocfs2_test_bit(start + tmp, bitmap)) { | |
693 | printk("ocfs2_verify_zero_bits: start = %u, count = " | |
694 | "%u\n", start, count); | |
695 | printk("ocfs2_verify_zero_bits: bit %u is set!", | |
696 | start + tmp); | |
697 | BUG(); | |
698 | } | |
699 | } | |
700 | } | |
701 | #endif | |
702 | ||
703 | /* | |
704 | * sync the local alloc to main bitmap. | |
705 | * | |
706 | * assumes you've already locked the main bitmap -- the bitmap inode | |
707 | * passed is used for caching. | |
708 | */ | |
709 | static int ocfs2_sync_local_to_main(struct ocfs2_super *osb, | |
710 | struct ocfs2_journal_handle *handle, | |
711 | struct ocfs2_dinode *alloc, | |
712 | struct inode *main_bm_inode, | |
713 | struct buffer_head *main_bm_bh) | |
714 | { | |
715 | int status = 0; | |
716 | int bit_off, left, count, start; | |
717 | u64 la_start_blk; | |
718 | u64 blkno; | |
719 | void *bitmap; | |
720 | struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc); | |
721 | ||
722 | mlog_entry("total = %u, COUNT = %u, used = %u\n", | |
723 | le32_to_cpu(alloc->id1.bitmap1.i_total), | |
724 | ocfs2_local_alloc_count_bits(alloc), | |
725 | le32_to_cpu(alloc->id1.bitmap1.i_used)); | |
726 | ||
727 | if (!alloc->id1.bitmap1.i_total) { | |
728 | mlog(0, "nothing to sync!\n"); | |
729 | goto bail; | |
730 | } | |
731 | ||
732 | if (le32_to_cpu(alloc->id1.bitmap1.i_used) == | |
733 | le32_to_cpu(alloc->id1.bitmap1.i_total)) { | |
734 | mlog(0, "all bits were taken!\n"); | |
735 | goto bail; | |
736 | } | |
737 | ||
738 | la_start_blk = ocfs2_clusters_to_blocks(osb->sb, | |
739 | le32_to_cpu(la->la_bm_off)); | |
740 | bitmap = la->la_bitmap; | |
741 | start = count = bit_off = 0; | |
742 | left = le32_to_cpu(alloc->id1.bitmap1.i_total); | |
743 | ||
744 | while ((bit_off = ocfs2_find_next_zero_bit(bitmap, left, start)) | |
745 | != -1) { | |
746 | if ((bit_off < left) && (bit_off == start)) { | |
747 | count++; | |
748 | start++; | |
749 | continue; | |
750 | } | |
751 | if (count) { | |
752 | blkno = la_start_blk + | |
753 | ocfs2_clusters_to_blocks(osb->sb, | |
754 | start - count); | |
755 | ||
b0697053 MF |
756 | mlog(0, "freeing %u bits starting at local alloc bit " |
757 | "%u (la_start_blk = %llu, blkno = %llu)\n", | |
758 | count, start - count, | |
759 | (unsigned long long)la_start_blk, | |
760 | (unsigned long long)blkno); | |
ccd979bd MF |
761 | |
762 | status = ocfs2_free_clusters(handle, main_bm_inode, | |
763 | main_bm_bh, blkno, count); | |
764 | if (status < 0) { | |
765 | mlog_errno(status); | |
766 | goto bail; | |
767 | } | |
768 | } | |
769 | if (bit_off >= left) | |
770 | break; | |
771 | count = 1; | |
772 | start = bit_off + 1; | |
773 | } | |
774 | ||
775 | bail: | |
776 | mlog_exit(status); | |
777 | return status; | |
778 | } | |
779 | ||
780 | static int ocfs2_local_alloc_reserve_for_window(struct ocfs2_super *osb, | |
781 | struct ocfs2_journal_handle *handle, | |
782 | struct ocfs2_alloc_context **ac, | |
783 | struct inode **bitmap_inode, | |
784 | struct buffer_head **bitmap_bh) | |
785 | { | |
786 | int status; | |
787 | ||
788 | *ac = kcalloc(1, sizeof(struct ocfs2_alloc_context), GFP_KERNEL); | |
789 | if (!(*ac)) { | |
790 | status = -ENOMEM; | |
791 | mlog_errno(status); | |
792 | goto bail; | |
793 | } | |
794 | ||
795 | (*ac)->ac_handle = handle; | |
796 | (*ac)->ac_bits_wanted = ocfs2_local_alloc_window_bits(osb); | |
797 | ||
798 | status = ocfs2_reserve_cluster_bitmap_bits(osb, *ac); | |
799 | if (status < 0) { | |
800 | if (status != -ENOSPC) | |
801 | mlog_errno(status); | |
802 | goto bail; | |
803 | } | |
804 | ||
805 | *bitmap_inode = (*ac)->ac_inode; | |
806 | igrab(*bitmap_inode); | |
807 | *bitmap_bh = (*ac)->ac_bh; | |
808 | get_bh(*bitmap_bh); | |
809 | status = 0; | |
810 | bail: | |
811 | if ((status < 0) && *ac) { | |
812 | ocfs2_free_alloc_context(*ac); | |
813 | *ac = NULL; | |
814 | } | |
815 | ||
816 | mlog_exit(status); | |
817 | return status; | |
818 | } | |
819 | ||
820 | /* | |
821 | * pass it the bitmap lock in lock_bh if you have it. | |
822 | */ | |
823 | static int ocfs2_local_alloc_new_window(struct ocfs2_super *osb, | |
824 | struct ocfs2_journal_handle *handle, | |
825 | struct ocfs2_alloc_context *ac) | |
826 | { | |
827 | int status = 0; | |
828 | u32 cluster_off, cluster_count; | |
829 | struct ocfs2_dinode *alloc = NULL; | |
830 | struct ocfs2_local_alloc *la; | |
831 | ||
832 | mlog_entry_void(); | |
833 | ||
834 | alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data; | |
835 | la = OCFS2_LOCAL_ALLOC(alloc); | |
836 | ||
837 | if (alloc->id1.bitmap1.i_total) | |
838 | mlog(0, "asking me to alloc a new window over a non-empty " | |
839 | "one\n"); | |
840 | ||
841 | mlog(0, "Allocating %u clusters for a new window.\n", | |
842 | ocfs2_local_alloc_window_bits(osb)); | |
883d4cae MF |
843 | |
844 | /* Instruct the allocation code to try the most recently used | |
845 | * cluster group. We'll re-record the group used this pass | |
846 | * below. */ | |
847 | ac->ac_last_group = osb->la_last_gd; | |
848 | ||
ccd979bd MF |
849 | /* we used the generic suballoc reserve function, but we set |
850 | * everything up nicely, so there's no reason why we can't use | |
851 | * the more specific cluster api to claim bits. */ | |
852 | status = ocfs2_claim_clusters(osb, handle, ac, | |
853 | ocfs2_local_alloc_window_bits(osb), | |
854 | &cluster_off, &cluster_count); | |
855 | if (status < 0) { | |
856 | if (status != -ENOSPC) | |
857 | mlog_errno(status); | |
858 | goto bail; | |
859 | } | |
860 | ||
883d4cae MF |
861 | osb->la_last_gd = ac->ac_last_group; |
862 | ||
ccd979bd MF |
863 | la->la_bm_off = cpu_to_le32(cluster_off); |
864 | alloc->id1.bitmap1.i_total = cpu_to_le32(cluster_count); | |
865 | /* just in case... In the future when we find space ourselves, | |
866 | * we don't have to get all contiguous -- but we'll have to | |
867 | * set all previously used bits in bitmap and update | |
868 | * la_bits_set before setting the bits in the main bitmap. */ | |
869 | alloc->id1.bitmap1.i_used = 0; | |
870 | memset(OCFS2_LOCAL_ALLOC(alloc)->la_bitmap, 0, | |
871 | le16_to_cpu(la->la_size)); | |
872 | ||
873 | mlog(0, "New window allocated:\n"); | |
874 | mlog(0, "window la_bm_off = %u\n", | |
875 | OCFS2_LOCAL_ALLOC(alloc)->la_bm_off); | |
876 | mlog(0, "window bits = %u\n", le32_to_cpu(alloc->id1.bitmap1.i_total)); | |
877 | ||
878 | bail: | |
879 | mlog_exit(status); | |
880 | return status; | |
881 | } | |
882 | ||
883 | /* Note that we do *NOT* lock the local alloc inode here as | |
884 | * it's been locked already for us. */ | |
885 | static int ocfs2_local_alloc_slide_window(struct ocfs2_super *osb, | |
886 | struct inode *local_alloc_inode) | |
887 | { | |
888 | int status = 0; | |
889 | struct buffer_head *main_bm_bh = NULL; | |
890 | struct inode *main_bm_inode = NULL; | |
891 | struct ocfs2_journal_handle *handle = NULL; | |
892 | struct ocfs2_dinode *alloc; | |
893 | struct ocfs2_dinode *alloc_copy = NULL; | |
894 | struct ocfs2_alloc_context *ac = NULL; | |
895 | ||
896 | mlog_entry_void(); | |
897 | ||
898 | handle = ocfs2_alloc_handle(osb); | |
899 | if (!handle) { | |
900 | status = -ENOMEM; | |
901 | mlog_errno(status); | |
902 | goto bail; | |
903 | } | |
904 | ||
905 | /* This will lock the main bitmap for us. */ | |
906 | status = ocfs2_local_alloc_reserve_for_window(osb, | |
907 | handle, | |
908 | &ac, | |
909 | &main_bm_inode, | |
910 | &main_bm_bh); | |
911 | if (status < 0) { | |
912 | if (status != -ENOSPC) | |
913 | mlog_errno(status); | |
914 | goto bail; | |
915 | } | |
916 | ||
917 | handle = ocfs2_start_trans(osb, handle, OCFS2_WINDOW_MOVE_CREDITS); | |
918 | if (IS_ERR(handle)) { | |
919 | status = PTR_ERR(handle); | |
920 | handle = NULL; | |
921 | mlog_errno(status); | |
922 | goto bail; | |
923 | } | |
924 | ||
925 | alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data; | |
926 | ||
927 | /* We want to clear the local alloc before doing anything | |
928 | * else, so that if we error later during this operation, | |
929 | * local alloc shutdown won't try to double free main bitmap | |
930 | * bits. Make a copy so the sync function knows which bits to | |
931 | * free. */ | |
932 | alloc_copy = kmalloc(osb->local_alloc_bh->b_size, GFP_KERNEL); | |
933 | if (!alloc_copy) { | |
934 | status = -ENOMEM; | |
935 | mlog_errno(status); | |
936 | goto bail; | |
937 | } | |
938 | memcpy(alloc_copy, alloc, osb->local_alloc_bh->b_size); | |
939 | ||
940 | status = ocfs2_journal_access(handle, local_alloc_inode, | |
941 | osb->local_alloc_bh, | |
942 | OCFS2_JOURNAL_ACCESS_WRITE); | |
943 | if (status < 0) { | |
944 | mlog_errno(status); | |
945 | goto bail; | |
946 | } | |
947 | ||
948 | ocfs2_clear_local_alloc(alloc); | |
949 | ||
950 | status = ocfs2_journal_dirty(handle, osb->local_alloc_bh); | |
951 | if (status < 0) { | |
952 | mlog_errno(status); | |
953 | goto bail; | |
954 | } | |
955 | ||
956 | status = ocfs2_sync_local_to_main(osb, handle, alloc_copy, | |
957 | main_bm_inode, main_bm_bh); | |
958 | if (status < 0) { | |
959 | mlog_errno(status); | |
960 | goto bail; | |
961 | } | |
962 | ||
963 | status = ocfs2_local_alloc_new_window(osb, handle, ac); | |
964 | if (status < 0) { | |
965 | if (status != -ENOSPC) | |
966 | mlog_errno(status); | |
967 | goto bail; | |
968 | } | |
969 | ||
970 | atomic_inc(&osb->alloc_stats.moves); | |
971 | ||
972 | status = 0; | |
973 | bail: | |
974 | if (handle) | |
975 | ocfs2_commit_trans(handle); | |
976 | ||
977 | if (main_bm_bh) | |
978 | brelse(main_bm_bh); | |
979 | ||
980 | if (main_bm_inode) | |
981 | iput(main_bm_inode); | |
982 | ||
983 | if (alloc_copy) | |
984 | kfree(alloc_copy); | |
985 | ||
986 | if (ac) | |
987 | ocfs2_free_alloc_context(ac); | |
988 | ||
989 | mlog_exit(status); | |
990 | return status; | |
991 | } | |
992 |