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Freezer: make kernel threads nonfreezable by default
[deliverable/linux.git] / fs / ocfs2 / localalloc.c
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 handle_t *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_alloc_context **ac,
68 struct inode **bitmap_inode,
69 struct buffer_head **bitmap_bh);
70
71 static int ocfs2_local_alloc_new_window(struct ocfs2_super *osb,
72 handle_t *handle,
73 struct ocfs2_alloc_context *ac);
74
75 static int ocfs2_local_alloc_slide_window(struct ocfs2_super *osb,
76 struct inode *local_alloc_inode);
77
78 /*
79 * Determine how large our local alloc window should be, in bits.
80 *
81 * These values (and the behavior in ocfs2_alloc_should_use_local) have
82 * been chosen so that most allocations, including new block groups go
83 * through local alloc.
84 */
85 static inline int ocfs2_local_alloc_window_bits(struct ocfs2_super *osb)
86 {
87 BUG_ON(osb->s_clustersize_bits < 12);
88
89 return 2048 >> (osb->s_clustersize_bits - 12);
90 }
91
92 /*
93 * Tell us whether a given allocation should use the local alloc
94 * file. Otherwise, it has to go to the main bitmap.
95 */
96 int ocfs2_alloc_should_use_local(struct ocfs2_super *osb, u64 bits)
97 {
98 int la_bits = ocfs2_local_alloc_window_bits(osb);
99
100 if (osb->local_alloc_state != OCFS2_LA_ENABLED)
101 return 0;
102
103 /* la_bits should be at least twice the size (in clusters) of
104 * a new block group. We want to be sure block group
105 * allocations go through the local alloc, so allow an
106 * allocation to take up to half the bitmap. */
107 if (bits > (la_bits / 2))
108 return 0;
109
110 return 1;
111 }
112
113 int ocfs2_load_local_alloc(struct ocfs2_super *osb)
114 {
115 int status = 0;
116 struct ocfs2_dinode *alloc = NULL;
117 struct buffer_head *alloc_bh = NULL;
118 u32 num_used;
119 struct inode *inode = NULL;
120 struct ocfs2_local_alloc *la;
121
122 mlog_entry_void();
123
124 /* read the alloc off disk */
125 inode = ocfs2_get_system_file_inode(osb, LOCAL_ALLOC_SYSTEM_INODE,
126 osb->slot_num);
127 if (!inode) {
128 status = -EINVAL;
129 mlog_errno(status);
130 goto bail;
131 }
132
133 status = ocfs2_read_block(osb, OCFS2_I(inode)->ip_blkno,
134 &alloc_bh, 0, inode);
135 if (status < 0) {
136 mlog_errno(status);
137 goto bail;
138 }
139
140 alloc = (struct ocfs2_dinode *) alloc_bh->b_data;
141 la = OCFS2_LOCAL_ALLOC(alloc);
142
143 if (!(le32_to_cpu(alloc->i_flags) &
144 (OCFS2_LOCAL_ALLOC_FL|OCFS2_BITMAP_FL))) {
145 mlog(ML_ERROR, "Invalid local alloc inode, %llu\n",
146 (unsigned long long)OCFS2_I(inode)->ip_blkno);
147 status = -EINVAL;
148 goto bail;
149 }
150
151 if ((la->la_size == 0) ||
152 (le16_to_cpu(la->la_size) > ocfs2_local_alloc_size(inode->i_sb))) {
153 mlog(ML_ERROR, "Local alloc size is invalid (la_size = %u)\n",
154 le16_to_cpu(la->la_size));
155 status = -EINVAL;
156 goto bail;
157 }
158
159 /* do a little verification. */
160 num_used = ocfs2_local_alloc_count_bits(alloc);
161
162 /* hopefully the local alloc has always been recovered before
163 * we load it. */
164 if (num_used
165 || alloc->id1.bitmap1.i_used
166 || alloc->id1.bitmap1.i_total
167 || la->la_bm_off)
168 mlog(ML_ERROR, "Local alloc hasn't been recovered!\n"
169 "found = %u, set = %u, taken = %u, off = %u\n",
170 num_used, le32_to_cpu(alloc->id1.bitmap1.i_used),
171 le32_to_cpu(alloc->id1.bitmap1.i_total),
172 OCFS2_LOCAL_ALLOC(alloc)->la_bm_off);
173
174 osb->local_alloc_bh = alloc_bh;
175 osb->local_alloc_state = OCFS2_LA_ENABLED;
176
177 bail:
178 if (status < 0)
179 if (alloc_bh)
180 brelse(alloc_bh);
181 if (inode)
182 iput(inode);
183
184 mlog_exit(status);
185 return status;
186 }
187
188 /*
189 * return any unused bits to the bitmap and write out a clean
190 * local_alloc.
191 *
192 * local_alloc_bh is optional. If not passed, we will simply use the
193 * one off osb. If you do pass it however, be warned that it *will* be
194 * returned brelse'd and NULL'd out.*/
195 void ocfs2_shutdown_local_alloc(struct ocfs2_super *osb)
196 {
197 int status;
198 handle_t *handle;
199 struct inode *local_alloc_inode = NULL;
200 struct buffer_head *bh = NULL;
201 struct buffer_head *main_bm_bh = NULL;
202 struct inode *main_bm_inode = NULL;
203 struct ocfs2_dinode *alloc_copy = NULL;
204 struct ocfs2_dinode *alloc = NULL;
205
206 mlog_entry_void();
207
208 if (osb->local_alloc_state == OCFS2_LA_UNUSED)
209 goto out;
210
211 local_alloc_inode =
212 ocfs2_get_system_file_inode(osb,
213 LOCAL_ALLOC_SYSTEM_INODE,
214 osb->slot_num);
215 if (!local_alloc_inode) {
216 status = -ENOENT;
217 mlog_errno(status);
218 goto out;
219 }
220
221 osb->local_alloc_state = OCFS2_LA_DISABLED;
222
223 main_bm_inode = ocfs2_get_system_file_inode(osb,
224 GLOBAL_BITMAP_SYSTEM_INODE,
225 OCFS2_INVALID_SLOT);
226 if (!main_bm_inode) {
227 status = -EINVAL;
228 mlog_errno(status);
229 goto out;
230 }
231
232 mutex_lock(&main_bm_inode->i_mutex);
233
234 status = ocfs2_meta_lock(main_bm_inode, &main_bm_bh, 1);
235 if (status < 0) {
236 mlog_errno(status);
237 goto out_mutex;
238 }
239
240 /* WINDOW_MOVE_CREDITS is a bit heavy... */
241 handle = ocfs2_start_trans(osb, OCFS2_WINDOW_MOVE_CREDITS);
242 if (IS_ERR(handle)) {
243 mlog_errno(PTR_ERR(handle));
244 handle = NULL;
245 goto out_unlock;
246 }
247
248 bh = osb->local_alloc_bh;
249 alloc = (struct ocfs2_dinode *) bh->b_data;
250
251 alloc_copy = kmalloc(bh->b_size, GFP_KERNEL);
252 if (!alloc_copy) {
253 status = -ENOMEM;
254 goto out_commit;
255 }
256 memcpy(alloc_copy, alloc, bh->b_size);
257
258 status = ocfs2_journal_access(handle, local_alloc_inode, bh,
259 OCFS2_JOURNAL_ACCESS_WRITE);
260 if (status < 0) {
261 mlog_errno(status);
262 goto out_commit;
263 }
264
265 ocfs2_clear_local_alloc(alloc);
266
267 status = ocfs2_journal_dirty(handle, bh);
268 if (status < 0) {
269 mlog_errno(status);
270 goto out_commit;
271 }
272
273 brelse(bh);
274 osb->local_alloc_bh = NULL;
275 osb->local_alloc_state = OCFS2_LA_UNUSED;
276
277 status = ocfs2_sync_local_to_main(osb, handle, alloc_copy,
278 main_bm_inode, main_bm_bh);
279 if (status < 0)
280 mlog_errno(status);
281
282 out_commit:
283 ocfs2_commit_trans(osb, handle);
284
285 out_unlock:
286 if (main_bm_bh)
287 brelse(main_bm_bh);
288
289 ocfs2_meta_unlock(main_bm_inode, 1);
290
291 out_mutex:
292 mutex_unlock(&main_bm_inode->i_mutex);
293 iput(main_bm_inode);
294
295 out:
296 if (local_alloc_inode)
297 iput(local_alloc_inode);
298
299 if (alloc_copy)
300 kfree(alloc_copy);
301
302 mlog_exit_void();
303 }
304
305 /*
306 * We want to free the bitmap bits outside of any recovery context as
307 * we'll need a cluster lock to do so, but we must clear the local
308 * alloc before giving up the recovered nodes journal. To solve this,
309 * we kmalloc a copy of the local alloc before it's change for the
310 * caller to process with ocfs2_complete_local_alloc_recovery
311 */
312 int ocfs2_begin_local_alloc_recovery(struct ocfs2_super *osb,
313 int slot_num,
314 struct ocfs2_dinode **alloc_copy)
315 {
316 int status = 0;
317 struct buffer_head *alloc_bh = NULL;
318 struct inode *inode = NULL;
319 struct ocfs2_dinode *alloc;
320
321 mlog_entry("(slot_num = %d)\n", slot_num);
322
323 *alloc_copy = NULL;
324
325 inode = ocfs2_get_system_file_inode(osb,
326 LOCAL_ALLOC_SYSTEM_INODE,
327 slot_num);
328 if (!inode) {
329 status = -EINVAL;
330 mlog_errno(status);
331 goto bail;
332 }
333
334 mutex_lock(&inode->i_mutex);
335
336 status = ocfs2_read_block(osb, OCFS2_I(inode)->ip_blkno,
337 &alloc_bh, 0, inode);
338 if (status < 0) {
339 mlog_errno(status);
340 goto bail;
341 }
342
343 *alloc_copy = kmalloc(alloc_bh->b_size, GFP_KERNEL);
344 if (!(*alloc_copy)) {
345 status = -ENOMEM;
346 goto bail;
347 }
348 memcpy((*alloc_copy), alloc_bh->b_data, alloc_bh->b_size);
349
350 alloc = (struct ocfs2_dinode *) alloc_bh->b_data;
351 ocfs2_clear_local_alloc(alloc);
352
353 status = ocfs2_write_block(osb, alloc_bh, inode);
354 if (status < 0)
355 mlog_errno(status);
356
357 bail:
358 if ((status < 0) && (*alloc_copy)) {
359 kfree(*alloc_copy);
360 *alloc_copy = NULL;
361 }
362
363 if (alloc_bh)
364 brelse(alloc_bh);
365
366 if (inode) {
367 mutex_unlock(&inode->i_mutex);
368 iput(inode);
369 }
370
371 mlog_exit(status);
372 return status;
373 }
374
375 /*
376 * Step 2: By now, we've completed the journal recovery, we've stamped
377 * a clean local alloc on disk and dropped the node out of the
378 * recovery map. Dlm locks will no longer stall, so lets clear out the
379 * main bitmap.
380 */
381 int ocfs2_complete_local_alloc_recovery(struct ocfs2_super *osb,
382 struct ocfs2_dinode *alloc)
383 {
384 int status;
385 handle_t *handle;
386 struct buffer_head *main_bm_bh = NULL;
387 struct inode *main_bm_inode;
388
389 mlog_entry_void();
390
391 main_bm_inode = ocfs2_get_system_file_inode(osb,
392 GLOBAL_BITMAP_SYSTEM_INODE,
393 OCFS2_INVALID_SLOT);
394 if (!main_bm_inode) {
395 status = -EINVAL;
396 mlog_errno(status);
397 goto out;
398 }
399
400 mutex_lock(&main_bm_inode->i_mutex);
401
402 status = ocfs2_meta_lock(main_bm_inode, &main_bm_bh, 1);
403 if (status < 0) {
404 mlog_errno(status);
405 goto out_mutex;
406 }
407
408 handle = ocfs2_start_trans(osb, OCFS2_WINDOW_MOVE_CREDITS);
409 if (IS_ERR(handle)) {
410 status = PTR_ERR(handle);
411 handle = NULL;
412 mlog_errno(status);
413 goto out_unlock;
414 }
415
416 /* we want the bitmap change to be recorded on disk asap */
417 handle->h_sync = 1;
418
419 status = ocfs2_sync_local_to_main(osb, handle, alloc,
420 main_bm_inode, main_bm_bh);
421 if (status < 0)
422 mlog_errno(status);
423
424 ocfs2_commit_trans(osb, handle);
425
426 out_unlock:
427 ocfs2_meta_unlock(main_bm_inode, 1);
428
429 out_mutex:
430 mutex_unlock(&main_bm_inode->i_mutex);
431
432 if (main_bm_bh)
433 brelse(main_bm_bh);
434
435 iput(main_bm_inode);
436
437 out:
438 mlog_exit(status);
439 return status;
440 }
441
442 /*
443 * make sure we've got at least bitswanted contiguous bits in the
444 * local alloc. You lose them when you drop i_mutex.
445 *
446 * We will add ourselves to the transaction passed in, but may start
447 * our own in order to shift windows.
448 */
449 int ocfs2_reserve_local_alloc_bits(struct ocfs2_super *osb,
450 u32 bits_wanted,
451 struct ocfs2_alloc_context *ac)
452 {
453 int status;
454 struct ocfs2_dinode *alloc;
455 struct inode *local_alloc_inode;
456 unsigned int free_bits;
457
458 mlog_entry_void();
459
460 BUG_ON(!ac);
461
462 local_alloc_inode =
463 ocfs2_get_system_file_inode(osb,
464 LOCAL_ALLOC_SYSTEM_INODE,
465 osb->slot_num);
466 if (!local_alloc_inode) {
467 status = -ENOENT;
468 mlog_errno(status);
469 goto bail;
470 }
471
472 mutex_lock(&local_alloc_inode->i_mutex);
473
474 if (osb->local_alloc_state != OCFS2_LA_ENABLED) {
475 status = -ENOSPC;
476 goto bail;
477 }
478
479 if (bits_wanted > ocfs2_local_alloc_window_bits(osb)) {
480 mlog(0, "Asking for more than my max window size!\n");
481 status = -ENOSPC;
482 goto bail;
483 }
484
485 alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
486
487 if (le32_to_cpu(alloc->id1.bitmap1.i_used) !=
488 ocfs2_local_alloc_count_bits(alloc)) {
489 ocfs2_error(osb->sb, "local alloc inode %llu says it has "
490 "%u free bits, but a count shows %u",
491 (unsigned long long)le64_to_cpu(alloc->i_blkno),
492 le32_to_cpu(alloc->id1.bitmap1.i_used),
493 ocfs2_local_alloc_count_bits(alloc));
494 status = -EIO;
495 goto bail;
496 }
497
498 free_bits = le32_to_cpu(alloc->id1.bitmap1.i_total) -
499 le32_to_cpu(alloc->id1.bitmap1.i_used);
500 if (bits_wanted > free_bits) {
501 /* uhoh, window change time. */
502 status =
503 ocfs2_local_alloc_slide_window(osb, local_alloc_inode);
504 if (status < 0) {
505 if (status != -ENOSPC)
506 mlog_errno(status);
507 goto bail;
508 }
509 }
510
511 ac->ac_inode = local_alloc_inode;
512 ac->ac_which = OCFS2_AC_USE_LOCAL;
513 get_bh(osb->local_alloc_bh);
514 ac->ac_bh = osb->local_alloc_bh;
515 status = 0;
516 bail:
517 if (status < 0 && local_alloc_inode)
518 iput(local_alloc_inode);
519
520 mlog_exit(status);
521 return status;
522 }
523
524 int ocfs2_claim_local_alloc_bits(struct ocfs2_super *osb,
525 handle_t *handle,
526 struct ocfs2_alloc_context *ac,
527 u32 min_bits,
528 u32 *bit_off,
529 u32 *num_bits)
530 {
531 int status, start;
532 struct inode *local_alloc_inode;
533 u32 bits_wanted;
534 void *bitmap;
535 struct ocfs2_dinode *alloc;
536 struct ocfs2_local_alloc *la;
537
538 mlog_entry_void();
539 BUG_ON(ac->ac_which != OCFS2_AC_USE_LOCAL);
540
541 bits_wanted = ac->ac_bits_wanted - ac->ac_bits_given;
542 local_alloc_inode = ac->ac_inode;
543 alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
544 la = OCFS2_LOCAL_ALLOC(alloc);
545
546 start = ocfs2_local_alloc_find_clear_bits(osb, alloc, bits_wanted);
547 if (start == -1) {
548 /* TODO: Shouldn't we just BUG here? */
549 status = -ENOSPC;
550 mlog_errno(status);
551 goto bail;
552 }
553
554 bitmap = la->la_bitmap;
555 *bit_off = le32_to_cpu(la->la_bm_off) + start;
556 /* local alloc is always contiguous by nature -- we never
557 * delete bits from it! */
558 *num_bits = bits_wanted;
559
560 status = ocfs2_journal_access(handle, local_alloc_inode,
561 osb->local_alloc_bh,
562 OCFS2_JOURNAL_ACCESS_WRITE);
563 if (status < 0) {
564 mlog_errno(status);
565 goto bail;
566 }
567
568 while(bits_wanted--)
569 ocfs2_set_bit(start++, bitmap);
570
571 alloc->id1.bitmap1.i_used = cpu_to_le32(*num_bits +
572 le32_to_cpu(alloc->id1.bitmap1.i_used));
573
574 status = ocfs2_journal_dirty(handle, osb->local_alloc_bh);
575 if (status < 0) {
576 mlog_errno(status);
577 goto bail;
578 }
579
580 status = 0;
581 bail:
582 mlog_exit(status);
583 return status;
584 }
585
586 static u32 ocfs2_local_alloc_count_bits(struct ocfs2_dinode *alloc)
587 {
588 int i;
589 u8 *buffer;
590 u32 count = 0;
591 struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc);
592
593 mlog_entry_void();
594
595 buffer = la->la_bitmap;
596 for (i = 0; i < le16_to_cpu(la->la_size); i++)
597 count += hweight8(buffer[i]);
598
599 mlog_exit(count);
600 return count;
601 }
602
603 static int ocfs2_local_alloc_find_clear_bits(struct ocfs2_super *osb,
604 struct ocfs2_dinode *alloc,
605 u32 numbits)
606 {
607 int numfound, bitoff, left, startoff, lastzero;
608 void *bitmap = NULL;
609
610 mlog_entry("(numbits wanted = %u)\n", numbits);
611
612 if (!alloc->id1.bitmap1.i_total) {
613 mlog(0, "No bits in my window!\n");
614 bitoff = -1;
615 goto bail;
616 }
617
618 bitmap = OCFS2_LOCAL_ALLOC(alloc)->la_bitmap;
619
620 numfound = bitoff = startoff = 0;
621 lastzero = -1;
622 left = le32_to_cpu(alloc->id1.bitmap1.i_total);
623 while ((bitoff = ocfs2_find_next_zero_bit(bitmap, left, startoff)) != -1) {
624 if (bitoff == left) {
625 /* mlog(0, "bitoff (%d) == left", bitoff); */
626 break;
627 }
628 /* mlog(0, "Found a zero: bitoff = %d, startoff = %d, "
629 "numfound = %d\n", bitoff, startoff, numfound);*/
630
631 /* Ok, we found a zero bit... is it contig. or do we
632 * start over?*/
633 if (bitoff == startoff) {
634 /* we found a zero */
635 numfound++;
636 startoff++;
637 } else {
638 /* got a zero after some ones */
639 numfound = 1;
640 startoff = bitoff+1;
641 }
642 /* we got everything we needed */
643 if (numfound == numbits) {
644 /* mlog(0, "Found it all!\n"); */
645 break;
646 }
647 }
648
649 mlog(0, "Exiting loop, bitoff = %d, numfound = %d\n", bitoff,
650 numfound);
651
652 if (numfound == numbits)
653 bitoff = startoff - numfound;
654 else
655 bitoff = -1;
656
657 bail:
658 mlog_exit(bitoff);
659 return bitoff;
660 }
661
662 static void ocfs2_clear_local_alloc(struct ocfs2_dinode *alloc)
663 {
664 struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc);
665 int i;
666 mlog_entry_void();
667
668 alloc->id1.bitmap1.i_total = 0;
669 alloc->id1.bitmap1.i_used = 0;
670 la->la_bm_off = 0;
671 for(i = 0; i < le16_to_cpu(la->la_size); i++)
672 la->la_bitmap[i] = 0;
673
674 mlog_exit_void();
675 }
676
677 #if 0
678 /* turn this on and uncomment below to aid debugging window shifts. */
679 static void ocfs2_verify_zero_bits(unsigned long *bitmap,
680 unsigned int start,
681 unsigned int count)
682 {
683 unsigned int tmp = count;
684 while(tmp--) {
685 if (ocfs2_test_bit(start + tmp, bitmap)) {
686 printk("ocfs2_verify_zero_bits: start = %u, count = "
687 "%u\n", start, count);
688 printk("ocfs2_verify_zero_bits: bit %u is set!",
689 start + tmp);
690 BUG();
691 }
692 }
693 }
694 #endif
695
696 /*
697 * sync the local alloc to main bitmap.
698 *
699 * assumes you've already locked the main bitmap -- the bitmap inode
700 * passed is used for caching.
701 */
702 static int ocfs2_sync_local_to_main(struct ocfs2_super *osb,
703 handle_t *handle,
704 struct ocfs2_dinode *alloc,
705 struct inode *main_bm_inode,
706 struct buffer_head *main_bm_bh)
707 {
708 int status = 0;
709 int bit_off, left, count, start;
710 u64 la_start_blk;
711 u64 blkno;
712 void *bitmap;
713 struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc);
714
715 mlog_entry("total = %u, COUNT = %u, used = %u\n",
716 le32_to_cpu(alloc->id1.bitmap1.i_total),
717 ocfs2_local_alloc_count_bits(alloc),
718 le32_to_cpu(alloc->id1.bitmap1.i_used));
719
720 if (!alloc->id1.bitmap1.i_total) {
721 mlog(0, "nothing to sync!\n");
722 goto bail;
723 }
724
725 if (le32_to_cpu(alloc->id1.bitmap1.i_used) ==
726 le32_to_cpu(alloc->id1.bitmap1.i_total)) {
727 mlog(0, "all bits were taken!\n");
728 goto bail;
729 }
730
731 la_start_blk = ocfs2_clusters_to_blocks(osb->sb,
732 le32_to_cpu(la->la_bm_off));
733 bitmap = la->la_bitmap;
734 start = count = bit_off = 0;
735 left = le32_to_cpu(alloc->id1.bitmap1.i_total);
736
737 while ((bit_off = ocfs2_find_next_zero_bit(bitmap, left, start))
738 != -1) {
739 if ((bit_off < left) && (bit_off == start)) {
740 count++;
741 start++;
742 continue;
743 }
744 if (count) {
745 blkno = la_start_blk +
746 ocfs2_clusters_to_blocks(osb->sb,
747 start - count);
748
749 mlog(0, "freeing %u bits starting at local alloc bit "
750 "%u (la_start_blk = %llu, blkno = %llu)\n",
751 count, start - count,
752 (unsigned long long)la_start_blk,
753 (unsigned long long)blkno);
754
755 status = ocfs2_free_clusters(handle, main_bm_inode,
756 main_bm_bh, blkno, count);
757 if (status < 0) {
758 mlog_errno(status);
759 goto bail;
760 }
761 }
762 if (bit_off >= left)
763 break;
764 count = 1;
765 start = bit_off + 1;
766 }
767
768 bail:
769 mlog_exit(status);
770 return status;
771 }
772
773 static int ocfs2_local_alloc_reserve_for_window(struct ocfs2_super *osb,
774 struct ocfs2_alloc_context **ac,
775 struct inode **bitmap_inode,
776 struct buffer_head **bitmap_bh)
777 {
778 int status;
779
780 *ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
781 if (!(*ac)) {
782 status = -ENOMEM;
783 mlog_errno(status);
784 goto bail;
785 }
786
787 (*ac)->ac_bits_wanted = ocfs2_local_alloc_window_bits(osb);
788
789 status = ocfs2_reserve_cluster_bitmap_bits(osb, *ac);
790 if (status < 0) {
791 if (status != -ENOSPC)
792 mlog_errno(status);
793 goto bail;
794 }
795
796 *bitmap_inode = (*ac)->ac_inode;
797 igrab(*bitmap_inode);
798 *bitmap_bh = (*ac)->ac_bh;
799 get_bh(*bitmap_bh);
800 status = 0;
801 bail:
802 if ((status < 0) && *ac) {
803 ocfs2_free_alloc_context(*ac);
804 *ac = NULL;
805 }
806
807 mlog_exit(status);
808 return status;
809 }
810
811 /*
812 * pass it the bitmap lock in lock_bh if you have it.
813 */
814 static int ocfs2_local_alloc_new_window(struct ocfs2_super *osb,
815 handle_t *handle,
816 struct ocfs2_alloc_context *ac)
817 {
818 int status = 0;
819 u32 cluster_off, cluster_count;
820 struct ocfs2_dinode *alloc = NULL;
821 struct ocfs2_local_alloc *la;
822
823 mlog_entry_void();
824
825 alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
826 la = OCFS2_LOCAL_ALLOC(alloc);
827
828 if (alloc->id1.bitmap1.i_total)
829 mlog(0, "asking me to alloc a new window over a non-empty "
830 "one\n");
831
832 mlog(0, "Allocating %u clusters for a new window.\n",
833 ocfs2_local_alloc_window_bits(osb));
834
835 /* Instruct the allocation code to try the most recently used
836 * cluster group. We'll re-record the group used this pass
837 * below. */
838 ac->ac_last_group = osb->la_last_gd;
839
840 /* we used the generic suballoc reserve function, but we set
841 * everything up nicely, so there's no reason why we can't use
842 * the more specific cluster api to claim bits. */
843 status = ocfs2_claim_clusters(osb, handle, ac,
844 ocfs2_local_alloc_window_bits(osb),
845 &cluster_off, &cluster_count);
846 if (status < 0) {
847 if (status != -ENOSPC)
848 mlog_errno(status);
849 goto bail;
850 }
851
852 osb->la_last_gd = ac->ac_last_group;
853
854 la->la_bm_off = cpu_to_le32(cluster_off);
855 alloc->id1.bitmap1.i_total = cpu_to_le32(cluster_count);
856 /* just in case... In the future when we find space ourselves,
857 * we don't have to get all contiguous -- but we'll have to
858 * set all previously used bits in bitmap and update
859 * la_bits_set before setting the bits in the main bitmap. */
860 alloc->id1.bitmap1.i_used = 0;
861 memset(OCFS2_LOCAL_ALLOC(alloc)->la_bitmap, 0,
862 le16_to_cpu(la->la_size));
863
864 mlog(0, "New window allocated:\n");
865 mlog(0, "window la_bm_off = %u\n",
866 OCFS2_LOCAL_ALLOC(alloc)->la_bm_off);
867 mlog(0, "window bits = %u\n", le32_to_cpu(alloc->id1.bitmap1.i_total));
868
869 bail:
870 mlog_exit(status);
871 return status;
872 }
873
874 /* Note that we do *NOT* lock the local alloc inode here as
875 * it's been locked already for us. */
876 static int ocfs2_local_alloc_slide_window(struct ocfs2_super *osb,
877 struct inode *local_alloc_inode)
878 {
879 int status = 0;
880 struct buffer_head *main_bm_bh = NULL;
881 struct inode *main_bm_inode = NULL;
882 handle_t *handle = NULL;
883 struct ocfs2_dinode *alloc;
884 struct ocfs2_dinode *alloc_copy = NULL;
885 struct ocfs2_alloc_context *ac = NULL;
886
887 mlog_entry_void();
888
889 /* This will lock the main bitmap for us. */
890 status = ocfs2_local_alloc_reserve_for_window(osb,
891 &ac,
892 &main_bm_inode,
893 &main_bm_bh);
894 if (status < 0) {
895 if (status != -ENOSPC)
896 mlog_errno(status);
897 goto bail;
898 }
899
900 handle = ocfs2_start_trans(osb, OCFS2_WINDOW_MOVE_CREDITS);
901 if (IS_ERR(handle)) {
902 status = PTR_ERR(handle);
903 handle = NULL;
904 mlog_errno(status);
905 goto bail;
906 }
907
908 alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
909
910 /* We want to clear the local alloc before doing anything
911 * else, so that if we error later during this operation,
912 * local alloc shutdown won't try to double free main bitmap
913 * bits. Make a copy so the sync function knows which bits to
914 * free. */
915 alloc_copy = kmalloc(osb->local_alloc_bh->b_size, GFP_KERNEL);
916 if (!alloc_copy) {
917 status = -ENOMEM;
918 mlog_errno(status);
919 goto bail;
920 }
921 memcpy(alloc_copy, alloc, osb->local_alloc_bh->b_size);
922
923 status = ocfs2_journal_access(handle, local_alloc_inode,
924 osb->local_alloc_bh,
925 OCFS2_JOURNAL_ACCESS_WRITE);
926 if (status < 0) {
927 mlog_errno(status);
928 goto bail;
929 }
930
931 ocfs2_clear_local_alloc(alloc);
932
933 status = ocfs2_journal_dirty(handle, osb->local_alloc_bh);
934 if (status < 0) {
935 mlog_errno(status);
936 goto bail;
937 }
938
939 status = ocfs2_sync_local_to_main(osb, handle, alloc_copy,
940 main_bm_inode, main_bm_bh);
941 if (status < 0) {
942 mlog_errno(status);
943 goto bail;
944 }
945
946 status = ocfs2_local_alloc_new_window(osb, handle, ac);
947 if (status < 0) {
948 if (status != -ENOSPC)
949 mlog_errno(status);
950 goto bail;
951 }
952
953 atomic_inc(&osb->alloc_stats.moves);
954
955 status = 0;
956 bail:
957 if (handle)
958 ocfs2_commit_trans(osb, handle);
959
960 if (main_bm_bh)
961 brelse(main_bm_bh);
962
963 if (main_bm_inode)
964 iput(main_bm_inode);
965
966 if (alloc_copy)
967 kfree(alloc_copy);
968
969 if (ac)
970 ocfs2_free_alloc_context(ac);
971
972 mlog_exit(status);
973 return status;
974 }
975
Linux kernel - Deliverables
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