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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * localalloc.c
4 *
5 * Node local data allocation
6 *
7 * Copyright (C) 2002, 2004 Oracle. All rights reserved.
8 */
9
10#include <linux/fs.h>
11#include <linux/types.h>
12#include <linux/slab.h>
13#include <linux/highmem.h>
14#include <linux/bitops.h>
15
16#include <cluster/masklog.h>
17
18#include "ocfs2.h"
19
20#include "alloc.h"
21#include "blockcheck.h"
22#include "dlmglue.h"
23#include "inode.h"
24#include "journal.h"
25#include "localalloc.h"
26#include "suballoc.h"
27#include "super.h"
28#include "sysfile.h"
29#include "ocfs2_trace.h"
30
31#include "buffer_head_io.h"
32
33#define OCFS2_LOCAL_ALLOC(dinode) (&((dinode)->id2.i_lab))
34
35static u32 ocfs2_local_alloc_count_bits(struct ocfs2_dinode *alloc);
36
37static int ocfs2_local_alloc_find_clear_bits(struct ocfs2_super *osb,
38 struct ocfs2_dinode *alloc,
39 u32 *numbits,
40 struct ocfs2_alloc_reservation *resv);
41
42static void ocfs2_clear_local_alloc(struct ocfs2_dinode *alloc);
43
44static int ocfs2_sync_local_to_main(struct ocfs2_super *osb,
45 handle_t *handle,
46 struct ocfs2_dinode *alloc,
47 struct inode *main_bm_inode,
48 struct buffer_head *main_bm_bh);
49
50static int ocfs2_local_alloc_reserve_for_window(struct ocfs2_super *osb,
51 struct ocfs2_alloc_context **ac,
52 struct inode **bitmap_inode,
53 struct buffer_head **bitmap_bh);
54
55static int ocfs2_local_alloc_new_window(struct ocfs2_super *osb,
56 handle_t *handle,
57 struct ocfs2_alloc_context *ac);
58
59static int ocfs2_local_alloc_slide_window(struct ocfs2_super *osb,
60 struct inode *local_alloc_inode);
61
62/*
63 * ocfs2_la_default_mb() - determine a default size, in megabytes of
64 * the local alloc.
65 *
66 * Generally, we'd like to pick as large a local alloc as
67 * possible. Performance on large workloads tends to scale
68 * proportionally to la size. In addition to that, the reservations
69 * code functions more efficiently as it can reserve more windows for
70 * write.
71 *
72 * Some things work against us when trying to choose a large local alloc:
73 *
74 * - We need to ensure our sizing is picked to leave enough space in
75 * group descriptors for other allocations (such as block groups,
76 * etc). Picking default sizes which are a multiple of 4 could help
77 * - block groups are allocated in 2mb and 4mb chunks.
78 *
79 * - Likewise, we don't want to starve other nodes of bits on small
80 * file systems. This can easily be taken care of by limiting our
81 * default to a reasonable size (256M) on larger cluster sizes.
82 *
83 * - Some file systems can't support very large sizes - 4k and 8k in
84 * particular are limited to less than 128 and 256 megabytes respectively.
85 *
86 * The following reference table shows group descriptor and local
87 * alloc maximums at various cluster sizes (4k blocksize)
88 *
89 * csize: 4K group: 126M la: 121M
90 * csize: 8K group: 252M la: 243M
91 * csize: 16K group: 504M la: 486M
92 * csize: 32K group: 1008M la: 972M
93 * csize: 64K group: 2016M la: 1944M
94 * csize: 128K group: 4032M la: 3888M
95 * csize: 256K group: 8064M la: 7776M
96 * csize: 512K group: 16128M la: 15552M
97 * csize: 1024K group: 32256M la: 31104M
98 */
99#define OCFS2_LA_MAX_DEFAULT_MB 256
100#define OCFS2_LA_OLD_DEFAULT 8
101unsigned int ocfs2_la_default_mb(struct ocfs2_super *osb)
102{
103 unsigned int la_mb;
104 unsigned int gd_mb;
105 unsigned int la_max_mb;
106 unsigned int megs_per_slot;
107 struct super_block *sb = osb->sb;
108
109 gd_mb = ocfs2_clusters_to_megabytes(osb->sb,
110 8 * ocfs2_group_bitmap_size(sb, 0, osb->s_feature_incompat));
111
112 /*
113 * This takes care of files systems with very small group
114 * descriptors - 512 byte blocksize at cluster sizes lower
115 * than 16K and also 1k blocksize with 4k cluster size.
116 */
117 if ((sb->s_blocksize == 512 && osb->s_clustersize <= 8192)
118 || (sb->s_blocksize == 1024 && osb->s_clustersize == 4096))
119 return OCFS2_LA_OLD_DEFAULT;
120
121 /*
122 * Leave enough room for some block groups and make the final
123 * value we work from a multiple of 4.
124 */
125 gd_mb -= 16;
126 gd_mb &= 0xFFFFFFFB;
127
128 la_mb = gd_mb;
129
130 /*
131 * Keep window sizes down to a reasonable default
132 */
133 if (la_mb > OCFS2_LA_MAX_DEFAULT_MB) {
134 /*
135 * Some clustersize / blocksize combinations will have
136 * given us a larger than OCFS2_LA_MAX_DEFAULT_MB
137 * default size, but get poor distribution when
138 * limited to exactly 256 megabytes.
139 *
140 * As an example, 16K clustersize at 4K blocksize
141 * gives us a cluster group size of 504M. Paring the
142 * local alloc size down to 256 however, would give us
143 * only one window and around 200MB left in the
144 * cluster group. Instead, find the first size below
145 * 256 which would give us an even distribution.
146 *
147 * Larger cluster group sizes actually work out pretty
148 * well when pared to 256, so we don't have to do this
149 * for any group that fits more than two
150 * OCFS2_LA_MAX_DEFAULT_MB windows.
151 */
152 if (gd_mb > (2 * OCFS2_LA_MAX_DEFAULT_MB))
153 la_mb = 256;
154 else {
155 unsigned int gd_mult = gd_mb;
156
157 while (gd_mult > 256)
158 gd_mult = gd_mult >> 1;
159
160 la_mb = gd_mult;
161 }
162 }
163
164 megs_per_slot = osb->osb_clusters_at_boot / osb->max_slots;
165 megs_per_slot = ocfs2_clusters_to_megabytes(osb->sb, megs_per_slot);
166 /* Too many nodes, too few disk clusters. */
167 if (megs_per_slot < la_mb)
168 la_mb = megs_per_slot;
169
170 /* We can't store more bits than we can in a block. */
171 la_max_mb = ocfs2_clusters_to_megabytes(osb->sb,
172 ocfs2_local_alloc_size(sb) * 8);
173 if (la_mb > la_max_mb)
174 la_mb = la_max_mb;
175
176 return la_mb;
177}
178
179void ocfs2_la_set_sizes(struct ocfs2_super *osb, int requested_mb)
180{
181 struct super_block *sb = osb->sb;
182 unsigned int la_default_mb = ocfs2_la_default_mb(osb);
183 unsigned int la_max_mb;
184
185 la_max_mb = ocfs2_clusters_to_megabytes(sb,
186 ocfs2_local_alloc_size(sb) * 8);
187
188 trace_ocfs2_la_set_sizes(requested_mb, la_max_mb, la_default_mb);
189
190 if (requested_mb == -1) {
191 /* No user request - use defaults */
192 osb->local_alloc_default_bits =
193 ocfs2_megabytes_to_clusters(sb, la_default_mb);
194 } else if (requested_mb > la_max_mb) {
195 /* Request is too big, we give the maximum available */
196 osb->local_alloc_default_bits =
197 ocfs2_megabytes_to_clusters(sb, la_max_mb);
198 } else {
199 osb->local_alloc_default_bits =
200 ocfs2_megabytes_to_clusters(sb, requested_mb);
201 }
202
203 osb->local_alloc_bits = osb->local_alloc_default_bits;
204}
205
206static inline int ocfs2_la_state_enabled(struct ocfs2_super *osb)
207{
208 return (osb->local_alloc_state == OCFS2_LA_THROTTLED ||
209 osb->local_alloc_state == OCFS2_LA_ENABLED);
210}
211
212void ocfs2_local_alloc_seen_free_bits(struct ocfs2_super *osb,
213 unsigned int num_clusters)
214{
215 if (num_clusters >= osb->local_alloc_default_bits) {
216 spin_lock(&osb->osb_lock);
217 if (osb->local_alloc_state == OCFS2_LA_DISABLED ||
218 osb->local_alloc_state == OCFS2_LA_THROTTLED) {
219 cancel_delayed_work(&osb->la_enable_wq);
220 osb->local_alloc_state = OCFS2_LA_ENABLED;
221 }
222 spin_unlock(&osb->osb_lock);
223 }
224}
225
226void ocfs2_la_enable_worker(struct work_struct *work)
227{
228 struct ocfs2_super *osb =
229 container_of(work, struct ocfs2_super,
230 la_enable_wq.work);
231 spin_lock(&osb->osb_lock);
232 osb->local_alloc_state = OCFS2_LA_ENABLED;
233 spin_unlock(&osb->osb_lock);
234}
235
236/*
237 * Tell us whether a given allocation should use the local alloc
238 * file. Otherwise, it has to go to the main bitmap.
239 *
240 * This function does semi-dirty reads of local alloc size and state!
241 * This is ok however, as the values are re-checked once under mutex.
242 */
243int ocfs2_alloc_should_use_local(struct ocfs2_super *osb, u64 bits)
244{
245 int ret = 0;
246 int la_bits;
247
248 spin_lock(&osb->osb_lock);
249 la_bits = osb->local_alloc_bits;
250
251 if (!ocfs2_la_state_enabled(osb))
252 goto bail;
253
254 /* la_bits should be at least twice the size (in clusters) of
255 * a new block group. We want to be sure block group
256 * allocations go through the local alloc, so allow an
257 * allocation to take up to half the bitmap. */
258 if (bits > (la_bits / 2))
259 goto bail;
260
261 ret = 1;
262bail:
263 trace_ocfs2_alloc_should_use_local(
264 (unsigned long long)bits, osb->local_alloc_state, la_bits, ret);
265 spin_unlock(&osb->osb_lock);
266 return ret;
267}
268
269int ocfs2_load_local_alloc(struct ocfs2_super *osb)
270{
271 int status = 0;
272 struct ocfs2_dinode *alloc = NULL;
273 struct buffer_head *alloc_bh = NULL;
274 u32 num_used;
275 struct inode *inode = NULL;
276 struct ocfs2_local_alloc *la;
277
278 if (osb->local_alloc_bits == 0)
279 goto bail;
280
281 if (osb->local_alloc_bits >= osb->bitmap_cpg) {
282 mlog(ML_NOTICE, "Requested local alloc window %d is larger "
283 "than max possible %u. Using defaults.\n",
284 osb->local_alloc_bits, (osb->bitmap_cpg - 1));
285 osb->local_alloc_bits =
286 ocfs2_megabytes_to_clusters(osb->sb,
287 ocfs2_la_default_mb(osb));
288 }
289
290 /* read the alloc off disk */
291 inode = ocfs2_get_system_file_inode(osb, LOCAL_ALLOC_SYSTEM_INODE,
292 osb->slot_num);
293 if (!inode) {
294 status = -EINVAL;
295 mlog_errno(status);
296 goto bail;
297 }
298
299 status = ocfs2_read_inode_block_full(inode, &alloc_bh,
300 OCFS2_BH_IGNORE_CACHE);
301 if (status < 0) {
302 mlog_errno(status);
303 goto bail;
304 }
305
306 alloc = (struct ocfs2_dinode *) alloc_bh->b_data;
307 la = OCFS2_LOCAL_ALLOC(alloc);
308
309 if (!(le32_to_cpu(alloc->i_flags) &
310 (OCFS2_LOCAL_ALLOC_FL|OCFS2_BITMAP_FL))) {
311 mlog(ML_ERROR, "Invalid local alloc inode, %llu\n",
312 (unsigned long long)OCFS2_I(inode)->ip_blkno);
313 status = -EINVAL;
314 goto bail;
315 }
316
317 if ((la->la_size == 0) ||
318 (le16_to_cpu(la->la_size) > ocfs2_local_alloc_size(inode->i_sb))) {
319 mlog(ML_ERROR, "Local alloc size is invalid (la_size = %u)\n",
320 le16_to_cpu(la->la_size));
321 status = -EINVAL;
322 goto bail;
323 }
324
325 /* do a little verification. */
326 num_used = ocfs2_local_alloc_count_bits(alloc);
327
328 /* hopefully the local alloc has always been recovered before
329 * we load it. */
330 if (num_used
331 || alloc->id1.bitmap1.i_used
332 || alloc->id1.bitmap1.i_total
333 || la->la_bm_off) {
334 mlog(ML_ERROR, "inconsistent detected, clean journal with"
335 " unrecovered local alloc, please run fsck.ocfs2!\n"
336 "found = %u, set = %u, taken = %u, off = %u\n",
337 num_used, le32_to_cpu(alloc->id1.bitmap1.i_used),
338 le32_to_cpu(alloc->id1.bitmap1.i_total),
339 le32_to_cpu(OCFS2_LOCAL_ALLOC(alloc)->la_bm_off));
340
341 status = -EINVAL;
342 goto bail;
343 }
344
345 osb->local_alloc_bh = alloc_bh;
346 osb->local_alloc_state = OCFS2_LA_ENABLED;
347
348bail:
349 if (status < 0)
350 brelse(alloc_bh);
351 iput(inode);
352
353 trace_ocfs2_load_local_alloc(osb->local_alloc_bits);
354
355 if (status)
356 mlog_errno(status);
357 return status;
358}
359
360/*
361 * return any unused bits to the bitmap and write out a clean
362 * local_alloc.
363 *
364 * local_alloc_bh is optional. If not passed, we will simply use the
365 * one off osb. If you do pass it however, be warned that it *will* be
366 * returned brelse'd and NULL'd out.*/
367void ocfs2_shutdown_local_alloc(struct ocfs2_super *osb)
368{
369 int status;
370 handle_t *handle;
371 struct inode *local_alloc_inode = NULL;
372 struct buffer_head *bh = NULL;
373 struct buffer_head *main_bm_bh = NULL;
374 struct inode *main_bm_inode = NULL;
375 struct ocfs2_dinode *alloc_copy = NULL;
376 struct ocfs2_dinode *alloc = NULL;
377
378 cancel_delayed_work(&osb->la_enable_wq);
379 if (osb->ocfs2_wq)
380 flush_workqueue(osb->ocfs2_wq);
381
382 if (osb->local_alloc_state == OCFS2_LA_UNUSED)
383 goto out;
384
385 local_alloc_inode =
386 ocfs2_get_system_file_inode(osb,
387 LOCAL_ALLOC_SYSTEM_INODE,
388 osb->slot_num);
389 if (!local_alloc_inode) {
390 status = -ENOENT;
391 mlog_errno(status);
392 goto out;
393 }
394
395 osb->local_alloc_state = OCFS2_LA_DISABLED;
396
397 ocfs2_resmap_uninit(&osb->osb_la_resmap);
398
399 main_bm_inode = ocfs2_get_system_file_inode(osb,
400 GLOBAL_BITMAP_SYSTEM_INODE,
401 OCFS2_INVALID_SLOT);
402 if (!main_bm_inode) {
403 status = -EINVAL;
404 mlog_errno(status);
405 goto out;
406 }
407
408 inode_lock(main_bm_inode);
409
410 status = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
411 if (status < 0) {
412 mlog_errno(status);
413 goto out_mutex;
414 }
415
416 /* WINDOW_MOVE_CREDITS is a bit heavy... */
417 handle = ocfs2_start_trans(osb, OCFS2_WINDOW_MOVE_CREDITS);
418 if (IS_ERR(handle)) {
419 mlog_errno(PTR_ERR(handle));
420 handle = NULL;
421 goto out_unlock;
422 }
423
424 bh = osb->local_alloc_bh;
425 alloc = (struct ocfs2_dinode *) bh->b_data;
426
427 alloc_copy = kmemdup(alloc, bh->b_size, GFP_NOFS);
428 if (!alloc_copy) {
429 status = -ENOMEM;
430 goto out_commit;
431 }
432
433 status = ocfs2_journal_access_di(handle, INODE_CACHE(local_alloc_inode),
434 bh, OCFS2_JOURNAL_ACCESS_WRITE);
435 if (status < 0) {
436 mlog_errno(status);
437 goto out_commit;
438 }
439
440 ocfs2_clear_local_alloc(alloc);
441 ocfs2_journal_dirty(handle, bh);
442
443 brelse(bh);
444 osb->local_alloc_bh = NULL;
445 osb->local_alloc_state = OCFS2_LA_UNUSED;
446
447 status = ocfs2_sync_local_to_main(osb, handle, alloc_copy,
448 main_bm_inode, main_bm_bh);
449 if (status < 0)
450 mlog_errno(status);
451
452out_commit:
453 ocfs2_commit_trans(osb, handle);
454
455out_unlock:
456 brelse(main_bm_bh);
457
458 ocfs2_inode_unlock(main_bm_inode, 1);
459
460out_mutex:
461 inode_unlock(main_bm_inode);
462 iput(main_bm_inode);
463
464out:
465 iput(local_alloc_inode);
466
467 kfree(alloc_copy);
468}
469
470/*
471 * We want to free the bitmap bits outside of any recovery context as
472 * we'll need a cluster lock to do so, but we must clear the local
473 * alloc before giving up the recovered nodes journal. To solve this,
474 * we kmalloc a copy of the local alloc before it's change for the
475 * caller to process with ocfs2_complete_local_alloc_recovery
476 */
477int ocfs2_begin_local_alloc_recovery(struct ocfs2_super *osb,
478 int slot_num,
479 struct ocfs2_dinode **alloc_copy)
480{
481 int status = 0;
482 struct buffer_head *alloc_bh = NULL;
483 struct inode *inode = NULL;
484 struct ocfs2_dinode *alloc;
485
486 trace_ocfs2_begin_local_alloc_recovery(slot_num);
487
488 *alloc_copy = NULL;
489
490 inode = ocfs2_get_system_file_inode(osb,
491 LOCAL_ALLOC_SYSTEM_INODE,
492 slot_num);
493 if (!inode) {
494 status = -EINVAL;
495 mlog_errno(status);
496 goto bail;
497 }
498
499 inode_lock(inode);
500
501 status = ocfs2_read_inode_block_full(inode, &alloc_bh,
502 OCFS2_BH_IGNORE_CACHE);
503 if (status < 0) {
504 mlog_errno(status);
505 goto bail;
506 }
507
508 *alloc_copy = kmalloc(alloc_bh->b_size, GFP_KERNEL);
509 if (!(*alloc_copy)) {
510 status = -ENOMEM;
511 goto bail;
512 }
513 memcpy((*alloc_copy), alloc_bh->b_data, alloc_bh->b_size);
514
515 alloc = (struct ocfs2_dinode *) alloc_bh->b_data;
516 ocfs2_clear_local_alloc(alloc);
517
518 ocfs2_compute_meta_ecc(osb->sb, alloc_bh->b_data, &alloc->i_check);
519 status = ocfs2_write_block(osb, alloc_bh, INODE_CACHE(inode));
520 if (status < 0)
521 mlog_errno(status);
522
523bail:
524 if (status < 0) {
525 kfree(*alloc_copy);
526 *alloc_copy = NULL;
527 }
528
529 brelse(alloc_bh);
530
531 if (inode) {
532 inode_unlock(inode);
533 iput(inode);
534 }
535
536 if (status)
537 mlog_errno(status);
538 return status;
539}
540
541/*
542 * Step 2: By now, we've completed the journal recovery, we've stamped
543 * a clean local alloc on disk and dropped the node out of the
544 * recovery map. Dlm locks will no longer stall, so lets clear out the
545 * main bitmap.
546 */
547int ocfs2_complete_local_alloc_recovery(struct ocfs2_super *osb,
548 struct ocfs2_dinode *alloc)
549{
550 int status;
551 handle_t *handle;
552 struct buffer_head *main_bm_bh = NULL;
553 struct inode *main_bm_inode;
554
555 main_bm_inode = ocfs2_get_system_file_inode(osb,
556 GLOBAL_BITMAP_SYSTEM_INODE,
557 OCFS2_INVALID_SLOT);
558 if (!main_bm_inode) {
559 status = -EINVAL;
560 mlog_errno(status);
561 goto out;
562 }
563
564 inode_lock(main_bm_inode);
565
566 status = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
567 if (status < 0) {
568 mlog_errno(status);
569 goto out_mutex;
570 }
571
572 handle = ocfs2_start_trans(osb, OCFS2_WINDOW_MOVE_CREDITS);
573 if (IS_ERR(handle)) {
574 status = PTR_ERR(handle);
575 handle = NULL;
576 mlog_errno(status);
577 goto out_unlock;
578 }
579
580 /* we want the bitmap change to be recorded on disk asap */
581 handle->h_sync = 1;
582
583 status = ocfs2_sync_local_to_main(osb, handle, alloc,
584 main_bm_inode, main_bm_bh);
585 if (status < 0)
586 mlog_errno(status);
587
588 ocfs2_commit_trans(osb, handle);
589
590out_unlock:
591 ocfs2_inode_unlock(main_bm_inode, 1);
592
593out_mutex:
594 inode_unlock(main_bm_inode);
595
596 brelse(main_bm_bh);
597
598 iput(main_bm_inode);
599
600out:
601 if (!status)
602 ocfs2_init_steal_slots(osb);
603 if (status)
604 mlog_errno(status);
605 return status;
606}
607
608/*
609 * make sure we've got at least bits_wanted contiguous bits in the
610 * local alloc. You lose them when you drop i_rwsem.
611 *
612 * We will add ourselves to the transaction passed in, but may start
613 * our own in order to shift windows.
614 */
615int ocfs2_reserve_local_alloc_bits(struct ocfs2_super *osb,
616 u32 bits_wanted,
617 struct ocfs2_alloc_context *ac)
618{
619 int status;
620 struct ocfs2_dinode *alloc;
621 struct inode *local_alloc_inode;
622 unsigned int free_bits;
623
624 BUG_ON(!ac);
625
626 local_alloc_inode =
627 ocfs2_get_system_file_inode(osb,
628 LOCAL_ALLOC_SYSTEM_INODE,
629 osb->slot_num);
630 if (!local_alloc_inode) {
631 status = -ENOENT;
632 mlog_errno(status);
633 goto bail;
634 }
635
636 inode_lock(local_alloc_inode);
637
638 /*
639 * We must double check state and allocator bits because
640 * another process may have changed them while holding i_rwsem.
641 */
642 spin_lock(&osb->osb_lock);
643 if (!ocfs2_la_state_enabled(osb) ||
644 (bits_wanted > osb->local_alloc_bits)) {
645 spin_unlock(&osb->osb_lock);
646 status = -ENOSPC;
647 goto bail;
648 }
649 spin_unlock(&osb->osb_lock);
650
651 alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
652
653#ifdef CONFIG_OCFS2_DEBUG_FS
654 if (le32_to_cpu(alloc->id1.bitmap1.i_used) !=
655 ocfs2_local_alloc_count_bits(alloc)) {
656 status = ocfs2_error(osb->sb, "local alloc inode %llu says it has %u used bits, but a count shows %u\n",
657 (unsigned long long)le64_to_cpu(alloc->i_blkno),
658 le32_to_cpu(alloc->id1.bitmap1.i_used),
659 ocfs2_local_alloc_count_bits(alloc));
660 goto bail;
661 }
662#endif
663
664 free_bits = le32_to_cpu(alloc->id1.bitmap1.i_total) -
665 le32_to_cpu(alloc->id1.bitmap1.i_used);
666 if (bits_wanted > free_bits) {
667 /* uhoh, window change time. */
668 status =
669 ocfs2_local_alloc_slide_window(osb, local_alloc_inode);
670 if (status < 0) {
671 if (status != -ENOSPC)
672 mlog_errno(status);
673 goto bail;
674 }
675
676 /*
677 * Under certain conditions, the window slide code
678 * might have reduced the number of bits available or
679 * disabled the local alloc entirely. Re-check
680 * here and return -ENOSPC if necessary.
681 */
682 status = -ENOSPC;
683 if (!ocfs2_la_state_enabled(osb))
684 goto bail;
685
686 free_bits = le32_to_cpu(alloc->id1.bitmap1.i_total) -
687 le32_to_cpu(alloc->id1.bitmap1.i_used);
688 if (bits_wanted > free_bits)
689 goto bail;
690 }
691
692 ac->ac_inode = local_alloc_inode;
693 /* We should never use localalloc from another slot */
694 ac->ac_alloc_slot = osb->slot_num;
695 ac->ac_which = OCFS2_AC_USE_LOCAL;
696 get_bh(osb->local_alloc_bh);
697 ac->ac_bh = osb->local_alloc_bh;
698 status = 0;
699bail:
700 if (status < 0 && local_alloc_inode) {
701 inode_unlock(local_alloc_inode);
702 iput(local_alloc_inode);
703 }
704
705 trace_ocfs2_reserve_local_alloc_bits(
706 (unsigned long long)ac->ac_max_block,
707 bits_wanted, osb->slot_num, status);
708
709 if (status)
710 mlog_errno(status);
711 return status;
712}
713
714int ocfs2_claim_local_alloc_bits(struct ocfs2_super *osb,
715 handle_t *handle,
716 struct ocfs2_alloc_context *ac,
717 u32 bits_wanted,
718 u32 *bit_off,
719 u32 *num_bits)
720{
721 int status, start;
722 struct inode *local_alloc_inode;
723 void *bitmap;
724 struct ocfs2_dinode *alloc;
725 struct ocfs2_local_alloc *la;
726
727 BUG_ON(ac->ac_which != OCFS2_AC_USE_LOCAL);
728
729 local_alloc_inode = ac->ac_inode;
730 alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
731 la = OCFS2_LOCAL_ALLOC(alloc);
732
733 start = ocfs2_local_alloc_find_clear_bits(osb, alloc, &bits_wanted,
734 ac->ac_resv);
735 if (start == -1) {
736 /* TODO: Shouldn't we just BUG here? */
737 status = -ENOSPC;
738 mlog_errno(status);
739 goto bail;
740 }
741
742 bitmap = la->la_bitmap;
743 *bit_off = le32_to_cpu(la->la_bm_off) + start;
744 *num_bits = bits_wanted;
745
746 status = ocfs2_journal_access_di(handle,
747 INODE_CACHE(local_alloc_inode),
748 osb->local_alloc_bh,
749 OCFS2_JOURNAL_ACCESS_WRITE);
750 if (status < 0) {
751 mlog_errno(status);
752 goto bail;
753 }
754
755 ocfs2_resmap_claimed_bits(&osb->osb_la_resmap, ac->ac_resv, start,
756 bits_wanted);
757
758 while(bits_wanted--)
759 ocfs2_set_bit(start++, bitmap);
760
761 le32_add_cpu(&alloc->id1.bitmap1.i_used, *num_bits);
762 ocfs2_journal_dirty(handle, osb->local_alloc_bh);
763
764bail:
765 if (status)
766 mlog_errno(status);
767 return status;
768}
769
770int ocfs2_free_local_alloc_bits(struct ocfs2_super *osb,
771 handle_t *handle,
772 struct ocfs2_alloc_context *ac,
773 u32 bit_off,
774 u32 num_bits)
775{
776 int status, start;
777 u32 clear_bits;
778 struct inode *local_alloc_inode;
779 void *bitmap;
780 struct ocfs2_dinode *alloc;
781 struct ocfs2_local_alloc *la;
782
783 BUG_ON(ac->ac_which != OCFS2_AC_USE_LOCAL);
784
785 local_alloc_inode = ac->ac_inode;
786 alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
787 la = OCFS2_LOCAL_ALLOC(alloc);
788
789 bitmap = la->la_bitmap;
790 start = bit_off - le32_to_cpu(la->la_bm_off);
791 clear_bits = num_bits;
792
793 status = ocfs2_journal_access_di(handle,
794 INODE_CACHE(local_alloc_inode),
795 osb->local_alloc_bh,
796 OCFS2_JOURNAL_ACCESS_WRITE);
797 if (status < 0) {
798 mlog_errno(status);
799 goto bail;
800 }
801
802 while (clear_bits--)
803 ocfs2_clear_bit(start++, bitmap);
804
805 le32_add_cpu(&alloc->id1.bitmap1.i_used, -num_bits);
806 ocfs2_journal_dirty(handle, osb->local_alloc_bh);
807
808bail:
809 return status;
810}
811
812static u32 ocfs2_local_alloc_count_bits(struct ocfs2_dinode *alloc)
813{
814 u32 count;
815 struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc);
816
817 count = memweight(la->la_bitmap, le16_to_cpu(la->la_size));
818
819 trace_ocfs2_local_alloc_count_bits(count);
820 return count;
821}
822
823static int ocfs2_local_alloc_find_clear_bits(struct ocfs2_super *osb,
824 struct ocfs2_dinode *alloc,
825 u32 *numbits,
826 struct ocfs2_alloc_reservation *resv)
827{
828 int numfound = 0, bitoff, left, startoff;
829 int local_resv = 0;
830 struct ocfs2_alloc_reservation r;
831 void *bitmap = NULL;
832 struct ocfs2_reservation_map *resmap = &osb->osb_la_resmap;
833
834 if (!alloc->id1.bitmap1.i_total) {
835 bitoff = -1;
836 goto bail;
837 }
838
839 if (!resv) {
840 local_resv = 1;
841 ocfs2_resv_init_once(&r);
842 ocfs2_resv_set_type(&r, OCFS2_RESV_FLAG_TMP);
843 resv = &r;
844 }
845
846 numfound = *numbits;
847 if (ocfs2_resmap_resv_bits(resmap, resv, &bitoff, &numfound) == 0) {
848 if (numfound < *numbits)
849 *numbits = numfound;
850 goto bail;
851 }
852
853 /*
854 * Code error. While reservations are enabled, local
855 * allocation should _always_ go through them.
856 */
857 BUG_ON(osb->osb_resv_level != 0);
858
859 /*
860 * Reservations are disabled. Handle this the old way.
861 */
862
863 bitmap = OCFS2_LOCAL_ALLOC(alloc)->la_bitmap;
864
865 numfound = bitoff = startoff = 0;
866 left = le32_to_cpu(alloc->id1.bitmap1.i_total);
867 while ((bitoff = ocfs2_find_next_zero_bit(bitmap, left, startoff)) <
868 left) {
869 /* Ok, we found a zero bit... is it contig. or do we
870 * start over?*/
871 if (bitoff == startoff) {
872 /* we found a zero */
873 numfound++;
874 startoff++;
875 } else {
876 /* got a zero after some ones */
877 numfound = 1;
878 startoff = bitoff+1;
879 }
880 /* we got everything we needed */
881 if (numfound == *numbits) {
882 /* mlog(0, "Found it all!\n"); */
883 break;
884 }
885 }
886
887 trace_ocfs2_local_alloc_find_clear_bits_search_bitmap(bitoff, numfound);
888
889 if (numfound == *numbits)
890 bitoff = startoff - numfound;
891 else
892 bitoff = -1;
893
894bail:
895 if (local_resv)
896 ocfs2_resv_discard(resmap, resv);
897
898 trace_ocfs2_local_alloc_find_clear_bits(*numbits,
899 le32_to_cpu(alloc->id1.bitmap1.i_total),
900 bitoff, numfound);
901
902 return bitoff;
903}
904
905static void ocfs2_clear_local_alloc(struct ocfs2_dinode *alloc)
906{
907 struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc);
908
909 alloc->id1.bitmap1.i_total = 0;
910 alloc->id1.bitmap1.i_used = 0;
911 la->la_bm_off = 0;
912 memset(la->la_bitmap, 0, le16_to_cpu(la->la_size));
913}
914
915#if 0
916/* turn this on and uncomment below to aid debugging window shifts. */
917static void ocfs2_verify_zero_bits(unsigned long *bitmap,
918 unsigned int start,
919 unsigned int count)
920{
921 unsigned int tmp = count;
922 while(tmp--) {
923 if (ocfs2_test_bit(start + tmp, bitmap)) {
924 printk("ocfs2_verify_zero_bits: start = %u, count = "
925 "%u\n", start, count);
926 printk("ocfs2_verify_zero_bits: bit %u is set!",
927 start + tmp);
928 BUG();
929 }
930 }
931}
932#endif
933
934/*
935 * sync the local alloc to main bitmap.
936 *
937 * assumes you've already locked the main bitmap -- the bitmap inode
938 * passed is used for caching.
939 */
940static int ocfs2_sync_local_to_main(struct ocfs2_super *osb,
941 handle_t *handle,
942 struct ocfs2_dinode *alloc,
943 struct inode *main_bm_inode,
944 struct buffer_head *main_bm_bh)
945{
946 int status = 0;
947 int bit_off, left, count, start;
948 u64 la_start_blk;
949 u64 blkno;
950 void *bitmap;
951 struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc);
952
953 trace_ocfs2_sync_local_to_main(
954 le32_to_cpu(alloc->id1.bitmap1.i_total),
955 le32_to_cpu(alloc->id1.bitmap1.i_used));
956
957 if (!alloc->id1.bitmap1.i_total) {
958 goto bail;
959 }
960
961 if (le32_to_cpu(alloc->id1.bitmap1.i_used) ==
962 le32_to_cpu(alloc->id1.bitmap1.i_total)) {
963 goto bail;
964 }
965
966 la_start_blk = ocfs2_clusters_to_blocks(osb->sb,
967 le32_to_cpu(la->la_bm_off));
968 bitmap = la->la_bitmap;
969 start = count = 0;
970 left = le32_to_cpu(alloc->id1.bitmap1.i_total);
971
972 while (1) {
973 bit_off = ocfs2_find_next_zero_bit(bitmap, left, start);
974 if ((bit_off < left) && (bit_off == start)) {
975 count++;
976 start++;
977 continue;
978 }
979 if (count) {
980 blkno = la_start_blk +
981 ocfs2_clusters_to_blocks(osb->sb,
982 start - count);
983
984 trace_ocfs2_sync_local_to_main_free(
985 count, start - count,
986 (unsigned long long)la_start_blk,
987 (unsigned long long)blkno);
988
989 status = ocfs2_release_clusters(handle,
990 main_bm_inode,
991 main_bm_bh, blkno,
992 count);
993 if (status < 0) {
994 mlog_errno(status);
995 goto bail;
996 }
997 }
998
999 if (bit_off >= left)
1000 break;
1001 count = 1;
1002 start = bit_off + 1;
1003 }
1004
1005bail:
1006 if (status)
1007 mlog_errno(status);
1008 return status;
1009}
1010
1011enum ocfs2_la_event {
1012 OCFS2_LA_EVENT_SLIDE, /* Normal window slide. */
1013 OCFS2_LA_EVENT_FRAGMENTED, /* The global bitmap has
1014 * enough bits theoretically
1015 * free, but a contiguous
1016 * allocation could not be
1017 * found. */
1018 OCFS2_LA_EVENT_ENOSPC, /* Global bitmap doesn't have
1019 * enough bits free to satisfy
1020 * our request. */
1021};
1022#define OCFS2_LA_ENABLE_INTERVAL (30 * HZ)
1023/*
1024 * Given an event, calculate the size of our next local alloc window.
1025 *
1026 * This should always be called under i_rwsem of the local alloc inode
1027 * so that local alloc disabling doesn't race with processes trying to
1028 * use the allocator.
1029 *
1030 * Returns the state which the local alloc was left in. This value can
1031 * be ignored by some paths.
1032 */
1033static int ocfs2_recalc_la_window(struct ocfs2_super *osb,
1034 enum ocfs2_la_event event)
1035{
1036 unsigned int bits;
1037 int state;
1038
1039 spin_lock(&osb->osb_lock);
1040 if (osb->local_alloc_state == OCFS2_LA_DISABLED) {
1041 WARN_ON_ONCE(osb->local_alloc_state == OCFS2_LA_DISABLED);
1042 goto out_unlock;
1043 }
1044
1045 /*
1046 * ENOSPC and fragmentation are treated similarly for now.
1047 */
1048 if (event == OCFS2_LA_EVENT_ENOSPC ||
1049 event == OCFS2_LA_EVENT_FRAGMENTED) {
1050 /*
1051 * We ran out of contiguous space in the primary
1052 * bitmap. Drastically reduce the number of bits used
1053 * by local alloc until we have to disable it.
1054 */
1055 bits = osb->local_alloc_bits >> 1;
1056 if (bits > ocfs2_megabytes_to_clusters(osb->sb, 1)) {
1057 /*
1058 * By setting state to THROTTLED, we'll keep
1059 * the number of local alloc bits used down
1060 * until an event occurs which would give us
1061 * reason to assume the bitmap situation might
1062 * have changed.
1063 */
1064 osb->local_alloc_state = OCFS2_LA_THROTTLED;
1065 osb->local_alloc_bits = bits;
1066 } else {
1067 osb->local_alloc_state = OCFS2_LA_DISABLED;
1068 }
1069 queue_delayed_work(osb->ocfs2_wq, &osb->la_enable_wq,
1070 OCFS2_LA_ENABLE_INTERVAL);
1071 goto out_unlock;
1072 }
1073
1074 /*
1075 * Don't increase the size of the local alloc window until we
1076 * know we might be able to fulfill the request. Otherwise, we
1077 * risk bouncing around the global bitmap during periods of
1078 * low space.
1079 */
1080 if (osb->local_alloc_state != OCFS2_LA_THROTTLED)
1081 osb->local_alloc_bits = osb->local_alloc_default_bits;
1082
1083out_unlock:
1084 state = osb->local_alloc_state;
1085 spin_unlock(&osb->osb_lock);
1086
1087 return state;
1088}
1089
1090static int ocfs2_local_alloc_reserve_for_window(struct ocfs2_super *osb,
1091 struct ocfs2_alloc_context **ac,
1092 struct inode **bitmap_inode,
1093 struct buffer_head **bitmap_bh)
1094{
1095 int status;
1096
1097 *ac = kzalloc_obj(struct ocfs2_alloc_context);
1098 if (!(*ac)) {
1099 status = -ENOMEM;
1100 mlog_errno(status);
1101 goto bail;
1102 }
1103
1104retry_enospc:
1105 (*ac)->ac_bits_wanted = osb->local_alloc_bits;
1106 status = ocfs2_reserve_cluster_bitmap_bits(osb, *ac);
1107 if (status == -ENOSPC) {
1108 if (ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_ENOSPC) ==
1109 OCFS2_LA_DISABLED)
1110 goto bail;
1111
1112 ocfs2_free_ac_resource(*ac);
1113 memset(*ac, 0, sizeof(struct ocfs2_alloc_context));
1114 goto retry_enospc;
1115 }
1116 if (status < 0) {
1117 mlog_errno(status);
1118 goto bail;
1119 }
1120
1121 *bitmap_inode = (*ac)->ac_inode;
1122 igrab(*bitmap_inode);
1123 *bitmap_bh = (*ac)->ac_bh;
1124 get_bh(*bitmap_bh);
1125 status = 0;
1126bail:
1127 if ((status < 0) && *ac) {
1128 ocfs2_free_alloc_context(*ac);
1129 *ac = NULL;
1130 }
1131
1132 if (status)
1133 mlog_errno(status);
1134 return status;
1135}
1136
1137/*
1138 * pass it the bitmap lock in lock_bh if you have it.
1139 */
1140static int ocfs2_local_alloc_new_window(struct ocfs2_super *osb,
1141 handle_t *handle,
1142 struct ocfs2_alloc_context *ac)
1143{
1144 int status = 0;
1145 u32 cluster_off, cluster_count;
1146 struct ocfs2_dinode *alloc = NULL;
1147 struct ocfs2_local_alloc *la;
1148
1149 alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
1150 la = OCFS2_LOCAL_ALLOC(alloc);
1151
1152 trace_ocfs2_local_alloc_new_window(
1153 le32_to_cpu(alloc->id1.bitmap1.i_total),
1154 osb->local_alloc_bits);
1155
1156 /* Instruct the allocation code to try the most recently used
1157 * cluster group. We'll re-record the group used this pass
1158 * below. */
1159 ac->ac_last_group = osb->la_last_gd;
1160
1161 /* we used the generic suballoc reserve function, but we set
1162 * everything up nicely, so there's no reason why we can't use
1163 * the more specific cluster api to claim bits. */
1164 status = ocfs2_claim_clusters(handle, ac, osb->local_alloc_bits,
1165 &cluster_off, &cluster_count);
1166 if (status == -ENOSPC) {
1167retry_enospc:
1168 /*
1169 * Note: We could also try syncing the journal here to
1170 * allow use of any free bits which the current
1171 * transaction can't give us access to. --Mark
1172 */
1173 if (ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_FRAGMENTED) ==
1174 OCFS2_LA_DISABLED)
1175 goto bail;
1176
1177 ac->ac_bits_wanted = osb->local_alloc_bits;
1178 status = ocfs2_claim_clusters(handle, ac,
1179 osb->local_alloc_bits,
1180 &cluster_off,
1181 &cluster_count);
1182 if (status == -ENOSPC)
1183 goto retry_enospc;
1184 /*
1185 * We only shrunk the *minimum* number of in our
1186 * request - it's entirely possible that the allocator
1187 * might give us more than we asked for.
1188 */
1189 if (status == 0) {
1190 spin_lock(&osb->osb_lock);
1191 osb->local_alloc_bits = cluster_count;
1192 spin_unlock(&osb->osb_lock);
1193 }
1194 }
1195 if (status < 0) {
1196 if (status != -ENOSPC)
1197 mlog_errno(status);
1198 goto bail;
1199 }
1200
1201 osb->la_last_gd = ac->ac_last_group;
1202
1203 la->la_bm_off = cpu_to_le32(cluster_off);
1204 alloc->id1.bitmap1.i_total = cpu_to_le32(cluster_count);
1205 /* just in case... In the future when we find space ourselves,
1206 * we don't have to get all contiguous -- but we'll have to
1207 * set all previously used bits in bitmap and update
1208 * la_bits_set before setting the bits in the main bitmap. */
1209 alloc->id1.bitmap1.i_used = 0;
1210 memset(OCFS2_LOCAL_ALLOC(alloc)->la_bitmap, 0,
1211 le16_to_cpu(la->la_size));
1212
1213 ocfs2_resmap_restart(&osb->osb_la_resmap, cluster_count,
1214 OCFS2_LOCAL_ALLOC(alloc)->la_bitmap);
1215
1216 trace_ocfs2_local_alloc_new_window_result(
1217 le32_to_cpu(OCFS2_LOCAL_ALLOC(alloc)->la_bm_off),
1218 le32_to_cpu(alloc->id1.bitmap1.i_total));
1219
1220bail:
1221 if (status)
1222 mlog_errno(status);
1223 return status;
1224}
1225
1226/* Note that we do *NOT* lock the local alloc inode here as
1227 * it's been locked already for us. */
1228static int ocfs2_local_alloc_slide_window(struct ocfs2_super *osb,
1229 struct inode *local_alloc_inode)
1230{
1231 int status = 0;
1232 struct buffer_head *main_bm_bh = NULL;
1233 struct inode *main_bm_inode = NULL;
1234 handle_t *handle = NULL;
1235 struct ocfs2_dinode *alloc;
1236 struct ocfs2_dinode *alloc_copy = NULL;
1237 struct ocfs2_alloc_context *ac = NULL;
1238
1239 ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_SLIDE);
1240
1241 /* This will lock the main bitmap for us. */
1242 status = ocfs2_local_alloc_reserve_for_window(osb,
1243 &ac,
1244 &main_bm_inode,
1245 &main_bm_bh);
1246 if (status < 0) {
1247 if (status != -ENOSPC)
1248 mlog_errno(status);
1249 goto bail;
1250 }
1251
1252 handle = ocfs2_start_trans(osb, OCFS2_WINDOW_MOVE_CREDITS);
1253 if (IS_ERR(handle)) {
1254 status = PTR_ERR(handle);
1255 handle = NULL;
1256 mlog_errno(status);
1257 goto bail;
1258 }
1259
1260 alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
1261
1262 /* We want to clear the local alloc before doing anything
1263 * else, so that if we error later during this operation,
1264 * local alloc shutdown won't try to double free main bitmap
1265 * bits. Make a copy so the sync function knows which bits to
1266 * free. */
1267 alloc_copy = kmemdup(alloc, osb->local_alloc_bh->b_size, GFP_NOFS);
1268 if (!alloc_copy) {
1269 status = -ENOMEM;
1270 mlog_errno(status);
1271 goto bail;
1272 }
1273
1274 status = ocfs2_journal_access_di(handle,
1275 INODE_CACHE(local_alloc_inode),
1276 osb->local_alloc_bh,
1277 OCFS2_JOURNAL_ACCESS_WRITE);
1278 if (status < 0) {
1279 mlog_errno(status);
1280 goto bail;
1281 }
1282
1283 ocfs2_clear_local_alloc(alloc);
1284 ocfs2_journal_dirty(handle, osb->local_alloc_bh);
1285
1286 status = ocfs2_sync_local_to_main(osb, handle, alloc_copy,
1287 main_bm_inode, main_bm_bh);
1288 if (status < 0) {
1289 mlog_errno(status);
1290 goto bail;
1291 }
1292
1293 status = ocfs2_local_alloc_new_window(osb, handle, ac);
1294 if (status < 0) {
1295 if (status != -ENOSPC)
1296 mlog_errno(status);
1297 goto bail;
1298 }
1299
1300 atomic_inc(&osb->alloc_stats.moves);
1301
1302bail:
1303 if (handle)
1304 ocfs2_commit_trans(osb, handle);
1305
1306 brelse(main_bm_bh);
1307
1308 iput(main_bm_inode);
1309 kfree(alloc_copy);
1310
1311 if (ac)
1312 ocfs2_free_alloc_context(ac);
1313
1314 if (status)
1315 mlog_errno(status);
1316 return status;
1317}
1318