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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#include <cluster/masklog.h>
33
34#include "ocfs2.h"
35
36#include "alloc.h"
37#include "blockcheck.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#include "ocfs2_trace.h"
46
47#include "buffer_head_io.h"
48
49#define OCFS2_LOCAL_ALLOC(dinode) (&((dinode)->id2.i_lab))
50
51static u32 ocfs2_local_alloc_count_bits(struct ocfs2_dinode *alloc);
52
53static int ocfs2_local_alloc_find_clear_bits(struct ocfs2_super *osb,
54 struct ocfs2_dinode *alloc,
55 u32 *numbits,
56 struct ocfs2_alloc_reservation *resv);
57
58static void ocfs2_clear_local_alloc(struct ocfs2_dinode *alloc);
59
60static 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
66static 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
71static int ocfs2_local_alloc_new_window(struct ocfs2_super *osb,
72 handle_t *handle,
73 struct ocfs2_alloc_context *ac);
74
75static int ocfs2_local_alloc_slide_window(struct ocfs2_super *osb,
76 struct inode *local_alloc_inode);
77
78/*
79 * ocfs2_la_default_mb() - determine a default size, in megabytes of
80 * the local alloc.
81 *
82 * Generally, we'd like to pick as large a local alloc as
83 * possible. Performance on large workloads tends to scale
84 * proportionally to la size. In addition to that, the reservations
85 * code functions more efficiently as it can reserve more windows for
86 * write.
87 *
88 * Some things work against us when trying to choose a large local alloc:
89 *
90 * - We need to ensure our sizing is picked to leave enough space in
91 * group descriptors for other allocations (such as block groups,
92 * etc). Picking default sizes which are a multiple of 4 could help
93 * - block groups are allocated in 2mb and 4mb chunks.
94 *
95 * - Likewise, we don't want to starve other nodes of bits on small
96 * file systems. This can easily be taken care of by limiting our
97 * default to a reasonable size (256M) on larger cluster sizes.
98 *
99 * - Some file systems can't support very large sizes - 4k and 8k in
100 * particular are limited to less than 128 and 256 megabytes respectively.
101 *
102 * The following reference table shows group descriptor and local
103 * alloc maximums at various cluster sizes (4k blocksize)
104 *
105 * csize: 4K group: 126M la: 121M
106 * csize: 8K group: 252M la: 243M
107 * csize: 16K group: 504M la: 486M
108 * csize: 32K group: 1008M la: 972M
109 * csize: 64K group: 2016M la: 1944M
110 * csize: 128K group: 4032M la: 3888M
111 * csize: 256K group: 8064M la: 7776M
112 * csize: 512K group: 16128M la: 15552M
113 * csize: 1024K group: 32256M la: 31104M
114 */
115#define OCFS2_LA_MAX_DEFAULT_MB 256
116#define OCFS2_LA_OLD_DEFAULT 8
117unsigned int ocfs2_la_default_mb(struct ocfs2_super *osb)
118{
119 unsigned int la_mb;
120 unsigned int gd_mb;
121 unsigned int la_max_mb;
122 unsigned int megs_per_slot;
123 struct super_block *sb = osb->sb;
124
125 gd_mb = ocfs2_clusters_to_megabytes(osb->sb,
126 8 * ocfs2_group_bitmap_size(sb, 0, osb->s_feature_incompat));
127
128 /*
129 * This takes care of files systems with very small group
130 * descriptors - 512 byte blocksize at cluster sizes lower
131 * than 16K and also 1k blocksize with 4k cluster size.
132 */
133 if ((sb->s_blocksize == 512 && osb->s_clustersize <= 8192)
134 || (sb->s_blocksize == 1024 && osb->s_clustersize == 4096))
135 return OCFS2_LA_OLD_DEFAULT;
136
137 /*
138 * Leave enough room for some block groups and make the final
139 * value we work from a multiple of 4.
140 */
141 gd_mb -= 16;
142 gd_mb &= 0xFFFFFFFB;
143
144 la_mb = gd_mb;
145
146 /*
147 * Keep window sizes down to a reasonable default
148 */
149 if (la_mb > OCFS2_LA_MAX_DEFAULT_MB) {
150 /*
151 * Some clustersize / blocksize combinations will have
152 * given us a larger than OCFS2_LA_MAX_DEFAULT_MB
153 * default size, but get poor distribution when
154 * limited to exactly 256 megabytes.
155 *
156 * As an example, 16K clustersize at 4K blocksize
157 * gives us a cluster group size of 504M. Paring the
158 * local alloc size down to 256 however, would give us
159 * only one window and around 200MB left in the
160 * cluster group. Instead, find the first size below
161 * 256 which would give us an even distribution.
162 *
163 * Larger cluster group sizes actually work out pretty
164 * well when pared to 256, so we don't have to do this
165 * for any group that fits more than two
166 * OCFS2_LA_MAX_DEFAULT_MB windows.
167 */
168 if (gd_mb > (2 * OCFS2_LA_MAX_DEFAULT_MB))
169 la_mb = 256;
170 else {
171 unsigned int gd_mult = gd_mb;
172
173 while (gd_mult > 256)
174 gd_mult = gd_mult >> 1;
175
176 la_mb = gd_mult;
177 }
178 }
179
180 megs_per_slot = osb->osb_clusters_at_boot / osb->max_slots;
181 megs_per_slot = ocfs2_clusters_to_megabytes(osb->sb, megs_per_slot);
182 /* Too many nodes, too few disk clusters. */
183 if (megs_per_slot < la_mb)
184 la_mb = megs_per_slot;
185
186 /* We can't store more bits than we can in a block. */
187 la_max_mb = ocfs2_clusters_to_megabytes(osb->sb,
188 ocfs2_local_alloc_size(sb) * 8);
189 if (la_mb > la_max_mb)
190 la_mb = la_max_mb;
191
192 return la_mb;
193}
194
195void ocfs2_la_set_sizes(struct ocfs2_super *osb, int requested_mb)
196{
197 struct super_block *sb = osb->sb;
198 unsigned int la_default_mb = ocfs2_la_default_mb(osb);
199 unsigned int la_max_mb;
200
201 la_max_mb = ocfs2_clusters_to_megabytes(sb,
202 ocfs2_local_alloc_size(sb) * 8);
203
204 trace_ocfs2_la_set_sizes(requested_mb, la_max_mb, la_default_mb);
205
206 if (requested_mb == -1) {
207 /* No user request - use defaults */
208 osb->local_alloc_default_bits =
209 ocfs2_megabytes_to_clusters(sb, la_default_mb);
210 } else if (requested_mb > la_max_mb) {
211 /* Request is too big, we give the maximum available */
212 osb->local_alloc_default_bits =
213 ocfs2_megabytes_to_clusters(sb, la_max_mb);
214 } else {
215 osb->local_alloc_default_bits =
216 ocfs2_megabytes_to_clusters(sb, requested_mb);
217 }
218
219 osb->local_alloc_bits = osb->local_alloc_default_bits;
220}
221
222static inline int ocfs2_la_state_enabled(struct ocfs2_super *osb)
223{
224 return (osb->local_alloc_state == OCFS2_LA_THROTTLED ||
225 osb->local_alloc_state == OCFS2_LA_ENABLED);
226}
227
228void ocfs2_local_alloc_seen_free_bits(struct ocfs2_super *osb,
229 unsigned int num_clusters)
230{
231 spin_lock(&osb->osb_lock);
232 if (osb->local_alloc_state == OCFS2_LA_DISABLED ||
233 osb->local_alloc_state == OCFS2_LA_THROTTLED)
234 if (num_clusters >= osb->local_alloc_default_bits) {
235 cancel_delayed_work(&osb->la_enable_wq);
236 osb->local_alloc_state = OCFS2_LA_ENABLED;
237 }
238 spin_unlock(&osb->osb_lock);
239}
240
241void ocfs2_la_enable_worker(struct work_struct *work)
242{
243 struct ocfs2_super *osb =
244 container_of(work, struct ocfs2_super,
245 la_enable_wq.work);
246 spin_lock(&osb->osb_lock);
247 osb->local_alloc_state = OCFS2_LA_ENABLED;
248 spin_unlock(&osb->osb_lock);
249}
250
251/*
252 * Tell us whether a given allocation should use the local alloc
253 * file. Otherwise, it has to go to the main bitmap.
254 *
255 * This function does semi-dirty reads of local alloc size and state!
256 * This is ok however, as the values are re-checked once under mutex.
257 */
258int ocfs2_alloc_should_use_local(struct ocfs2_super *osb, u64 bits)
259{
260 int ret = 0;
261 int la_bits;
262
263 spin_lock(&osb->osb_lock);
264 la_bits = osb->local_alloc_bits;
265
266 if (!ocfs2_la_state_enabled(osb))
267 goto bail;
268
269 /* la_bits should be at least twice the size (in clusters) of
270 * a new block group. We want to be sure block group
271 * allocations go through the local alloc, so allow an
272 * allocation to take up to half the bitmap. */
273 if (bits > (la_bits / 2))
274 goto bail;
275
276 ret = 1;
277bail:
278 trace_ocfs2_alloc_should_use_local(
279 (unsigned long long)bits, osb->local_alloc_state, la_bits, ret);
280 spin_unlock(&osb->osb_lock);
281 return ret;
282}
283
284int ocfs2_load_local_alloc(struct ocfs2_super *osb)
285{
286 int status = 0;
287 struct ocfs2_dinode *alloc = NULL;
288 struct buffer_head *alloc_bh = NULL;
289 u32 num_used;
290 struct inode *inode = NULL;
291 struct ocfs2_local_alloc *la;
292
293 if (osb->local_alloc_bits == 0)
294 goto bail;
295
296 if (osb->local_alloc_bits >= osb->bitmap_cpg) {
297 mlog(ML_NOTICE, "Requested local alloc window %d is larger "
298 "than max possible %u. Using defaults.\n",
299 osb->local_alloc_bits, (osb->bitmap_cpg - 1));
300 osb->local_alloc_bits =
301 ocfs2_megabytes_to_clusters(osb->sb,
302 ocfs2_la_default_mb(osb));
303 }
304
305 /* read the alloc off disk */
306 inode = ocfs2_get_system_file_inode(osb, LOCAL_ALLOC_SYSTEM_INODE,
307 osb->slot_num);
308 if (!inode) {
309 status = -EINVAL;
310 mlog_errno(status);
311 goto bail;
312 }
313
314 status = ocfs2_read_inode_block_full(inode, &alloc_bh,
315 OCFS2_BH_IGNORE_CACHE);
316 if (status < 0) {
317 mlog_errno(status);
318 goto bail;
319 }
320
321 alloc = (struct ocfs2_dinode *) alloc_bh->b_data;
322 la = OCFS2_LOCAL_ALLOC(alloc);
323
324 if (!(le32_to_cpu(alloc->i_flags) &
325 (OCFS2_LOCAL_ALLOC_FL|OCFS2_BITMAP_FL))) {
326 mlog(ML_ERROR, "Invalid local alloc inode, %llu\n",
327 (unsigned long long)OCFS2_I(inode)->ip_blkno);
328 status = -EINVAL;
329 goto bail;
330 }
331
332 if ((la->la_size == 0) ||
333 (le16_to_cpu(la->la_size) > ocfs2_local_alloc_size(inode->i_sb))) {
334 mlog(ML_ERROR, "Local alloc size is invalid (la_size = %u)\n",
335 le16_to_cpu(la->la_size));
336 status = -EINVAL;
337 goto bail;
338 }
339
340 /* do a little verification. */
341 num_used = ocfs2_local_alloc_count_bits(alloc);
342
343 /* hopefully the local alloc has always been recovered before
344 * we load it. */
345 if (num_used
346 || alloc->id1.bitmap1.i_used
347 || alloc->id1.bitmap1.i_total
348 || la->la_bm_off)
349 mlog(ML_ERROR, "Local alloc hasn't been recovered!\n"
350 "found = %u, set = %u, taken = %u, off = %u\n",
351 num_used, le32_to_cpu(alloc->id1.bitmap1.i_used),
352 le32_to_cpu(alloc->id1.bitmap1.i_total),
353 OCFS2_LOCAL_ALLOC(alloc)->la_bm_off);
354
355 osb->local_alloc_bh = alloc_bh;
356 osb->local_alloc_state = OCFS2_LA_ENABLED;
357
358bail:
359 if (status < 0)
360 brelse(alloc_bh);
361 if (inode)
362 iput(inode);
363
364 trace_ocfs2_load_local_alloc(osb->local_alloc_bits);
365
366 if (status)
367 mlog_errno(status);
368 return status;
369}
370
371/*
372 * return any unused bits to the bitmap and write out a clean
373 * local_alloc.
374 *
375 * local_alloc_bh is optional. If not passed, we will simply use the
376 * one off osb. If you do pass it however, be warned that it *will* be
377 * returned brelse'd and NULL'd out.*/
378void ocfs2_shutdown_local_alloc(struct ocfs2_super *osb)
379{
380 int status;
381 handle_t *handle;
382 struct inode *local_alloc_inode = NULL;
383 struct buffer_head *bh = NULL;
384 struct buffer_head *main_bm_bh = NULL;
385 struct inode *main_bm_inode = NULL;
386 struct ocfs2_dinode *alloc_copy = NULL;
387 struct ocfs2_dinode *alloc = NULL;
388
389 cancel_delayed_work(&osb->la_enable_wq);
390 flush_workqueue(ocfs2_wq);
391
392 if (osb->local_alloc_state == OCFS2_LA_UNUSED)
393 goto out;
394
395 local_alloc_inode =
396 ocfs2_get_system_file_inode(osb,
397 LOCAL_ALLOC_SYSTEM_INODE,
398 osb->slot_num);
399 if (!local_alloc_inode) {
400 status = -ENOENT;
401 mlog_errno(status);
402 goto out;
403 }
404
405 osb->local_alloc_state = OCFS2_LA_DISABLED;
406
407 ocfs2_resmap_uninit(&osb->osb_la_resmap);
408
409 main_bm_inode = ocfs2_get_system_file_inode(osb,
410 GLOBAL_BITMAP_SYSTEM_INODE,
411 OCFS2_INVALID_SLOT);
412 if (!main_bm_inode) {
413 status = -EINVAL;
414 mlog_errno(status);
415 goto out;
416 }
417
418 mutex_lock(&main_bm_inode->i_mutex);
419
420 status = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
421 if (status < 0) {
422 mlog_errno(status);
423 goto out_mutex;
424 }
425
426 /* WINDOW_MOVE_CREDITS is a bit heavy... */
427 handle = ocfs2_start_trans(osb, OCFS2_WINDOW_MOVE_CREDITS);
428 if (IS_ERR(handle)) {
429 mlog_errno(PTR_ERR(handle));
430 handle = NULL;
431 goto out_unlock;
432 }
433
434 bh = osb->local_alloc_bh;
435 alloc = (struct ocfs2_dinode *) bh->b_data;
436
437 alloc_copy = kmalloc(bh->b_size, GFP_NOFS);
438 if (!alloc_copy) {
439 status = -ENOMEM;
440 goto out_commit;
441 }
442 memcpy(alloc_copy, alloc, bh->b_size);
443
444 status = ocfs2_journal_access_di(handle, INODE_CACHE(local_alloc_inode),
445 bh, OCFS2_JOURNAL_ACCESS_WRITE);
446 if (status < 0) {
447 mlog_errno(status);
448 goto out_commit;
449 }
450
451 ocfs2_clear_local_alloc(alloc);
452 ocfs2_journal_dirty(handle, bh);
453
454 brelse(bh);
455 osb->local_alloc_bh = NULL;
456 osb->local_alloc_state = OCFS2_LA_UNUSED;
457
458 status = ocfs2_sync_local_to_main(osb, handle, alloc_copy,
459 main_bm_inode, main_bm_bh);
460 if (status < 0)
461 mlog_errno(status);
462
463out_commit:
464 ocfs2_commit_trans(osb, handle);
465
466out_unlock:
467 brelse(main_bm_bh);
468
469 ocfs2_inode_unlock(main_bm_inode, 1);
470
471out_mutex:
472 mutex_unlock(&main_bm_inode->i_mutex);
473 iput(main_bm_inode);
474
475out:
476 if (local_alloc_inode)
477 iput(local_alloc_inode);
478
479 kfree(alloc_copy);
480}
481
482/*
483 * We want to free the bitmap bits outside of any recovery context as
484 * we'll need a cluster lock to do so, but we must clear the local
485 * alloc before giving up the recovered nodes journal. To solve this,
486 * we kmalloc a copy of the local alloc before it's change for the
487 * caller to process with ocfs2_complete_local_alloc_recovery
488 */
489int ocfs2_begin_local_alloc_recovery(struct ocfs2_super *osb,
490 int slot_num,
491 struct ocfs2_dinode **alloc_copy)
492{
493 int status = 0;
494 struct buffer_head *alloc_bh = NULL;
495 struct inode *inode = NULL;
496 struct ocfs2_dinode *alloc;
497
498 trace_ocfs2_begin_local_alloc_recovery(slot_num);
499
500 *alloc_copy = NULL;
501
502 inode = ocfs2_get_system_file_inode(osb,
503 LOCAL_ALLOC_SYSTEM_INODE,
504 slot_num);
505 if (!inode) {
506 status = -EINVAL;
507 mlog_errno(status);
508 goto bail;
509 }
510
511 mutex_lock(&inode->i_mutex);
512
513 status = ocfs2_read_inode_block_full(inode, &alloc_bh,
514 OCFS2_BH_IGNORE_CACHE);
515 if (status < 0) {
516 mlog_errno(status);
517 goto bail;
518 }
519
520 *alloc_copy = kmalloc(alloc_bh->b_size, GFP_KERNEL);
521 if (!(*alloc_copy)) {
522 status = -ENOMEM;
523 goto bail;
524 }
525 memcpy((*alloc_copy), alloc_bh->b_data, alloc_bh->b_size);
526
527 alloc = (struct ocfs2_dinode *) alloc_bh->b_data;
528 ocfs2_clear_local_alloc(alloc);
529
530 ocfs2_compute_meta_ecc(osb->sb, alloc_bh->b_data, &alloc->i_check);
531 status = ocfs2_write_block(osb, alloc_bh, INODE_CACHE(inode));
532 if (status < 0)
533 mlog_errno(status);
534
535bail:
536 if (status < 0) {
537 kfree(*alloc_copy);
538 *alloc_copy = NULL;
539 }
540
541 brelse(alloc_bh);
542
543 if (inode) {
544 mutex_unlock(&inode->i_mutex);
545 iput(inode);
546 }
547
548 if (status)
549 mlog_errno(status);
550 return status;
551}
552
553/*
554 * Step 2: By now, we've completed the journal recovery, we've stamped
555 * a clean local alloc on disk and dropped the node out of the
556 * recovery map. Dlm locks will no longer stall, so lets clear out the
557 * main bitmap.
558 */
559int ocfs2_complete_local_alloc_recovery(struct ocfs2_super *osb,
560 struct ocfs2_dinode *alloc)
561{
562 int status;
563 handle_t *handle;
564 struct buffer_head *main_bm_bh = NULL;
565 struct inode *main_bm_inode;
566
567 main_bm_inode = ocfs2_get_system_file_inode(osb,
568 GLOBAL_BITMAP_SYSTEM_INODE,
569 OCFS2_INVALID_SLOT);
570 if (!main_bm_inode) {
571 status = -EINVAL;
572 mlog_errno(status);
573 goto out;
574 }
575
576 mutex_lock(&main_bm_inode->i_mutex);
577
578 status = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
579 if (status < 0) {
580 mlog_errno(status);
581 goto out_mutex;
582 }
583
584 handle = ocfs2_start_trans(osb, OCFS2_WINDOW_MOVE_CREDITS);
585 if (IS_ERR(handle)) {
586 status = PTR_ERR(handle);
587 handle = NULL;
588 mlog_errno(status);
589 goto out_unlock;
590 }
591
592 /* we want the bitmap change to be recorded on disk asap */
593 handle->h_sync = 1;
594
595 status = ocfs2_sync_local_to_main(osb, handle, alloc,
596 main_bm_inode, main_bm_bh);
597 if (status < 0)
598 mlog_errno(status);
599
600 ocfs2_commit_trans(osb, handle);
601
602out_unlock:
603 ocfs2_inode_unlock(main_bm_inode, 1);
604
605out_mutex:
606 mutex_unlock(&main_bm_inode->i_mutex);
607
608 brelse(main_bm_bh);
609
610 iput(main_bm_inode);
611
612out:
613 if (!status)
614 ocfs2_init_steal_slots(osb);
615 if (status)
616 mlog_errno(status);
617 return status;
618}
619
620/*
621 * make sure we've got at least bits_wanted contiguous bits in the
622 * local alloc. You lose them when you drop i_mutex.
623 *
624 * We will add ourselves to the transaction passed in, but may start
625 * our own in order to shift windows.
626 */
627int ocfs2_reserve_local_alloc_bits(struct ocfs2_super *osb,
628 u32 bits_wanted,
629 struct ocfs2_alloc_context *ac)
630{
631 int status;
632 struct ocfs2_dinode *alloc;
633 struct inode *local_alloc_inode;
634 unsigned int free_bits;
635
636 BUG_ON(!ac);
637
638 local_alloc_inode =
639 ocfs2_get_system_file_inode(osb,
640 LOCAL_ALLOC_SYSTEM_INODE,
641 osb->slot_num);
642 if (!local_alloc_inode) {
643 status = -ENOENT;
644 mlog_errno(status);
645 goto bail;
646 }
647
648 mutex_lock(&local_alloc_inode->i_mutex);
649
650 /*
651 * We must double check state and allocator bits because
652 * another process may have changed them while holding i_mutex.
653 */
654 spin_lock(&osb->osb_lock);
655 if (!ocfs2_la_state_enabled(osb) ||
656 (bits_wanted > osb->local_alloc_bits)) {
657 spin_unlock(&osb->osb_lock);
658 status = -ENOSPC;
659 goto bail;
660 }
661 spin_unlock(&osb->osb_lock);
662
663 alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
664
665#ifdef CONFIG_OCFS2_DEBUG_FS
666 if (le32_to_cpu(alloc->id1.bitmap1.i_used) !=
667 ocfs2_local_alloc_count_bits(alloc)) {
668 ocfs2_error(osb->sb, "local alloc inode %llu says it has "
669 "%u free bits, but a count shows %u",
670 (unsigned long long)le64_to_cpu(alloc->i_blkno),
671 le32_to_cpu(alloc->id1.bitmap1.i_used),
672 ocfs2_local_alloc_count_bits(alloc));
673 status = -EIO;
674 goto bail;
675 }
676#endif
677
678 free_bits = le32_to_cpu(alloc->id1.bitmap1.i_total) -
679 le32_to_cpu(alloc->id1.bitmap1.i_used);
680 if (bits_wanted > free_bits) {
681 /* uhoh, window change time. */
682 status =
683 ocfs2_local_alloc_slide_window(osb, local_alloc_inode);
684 if (status < 0) {
685 if (status != -ENOSPC)
686 mlog_errno(status);
687 goto bail;
688 }
689
690 /*
691 * Under certain conditions, the window slide code
692 * might have reduced the number of bits available or
693 * disabled the the local alloc entirely. Re-check
694 * here and return -ENOSPC if necessary.
695 */
696 status = -ENOSPC;
697 if (!ocfs2_la_state_enabled(osb))
698 goto bail;
699
700 free_bits = le32_to_cpu(alloc->id1.bitmap1.i_total) -
701 le32_to_cpu(alloc->id1.bitmap1.i_used);
702 if (bits_wanted > free_bits)
703 goto bail;
704 }
705
706 ac->ac_inode = local_alloc_inode;
707 /* We should never use localalloc from another slot */
708 ac->ac_alloc_slot = osb->slot_num;
709 ac->ac_which = OCFS2_AC_USE_LOCAL;
710 get_bh(osb->local_alloc_bh);
711 ac->ac_bh = osb->local_alloc_bh;
712 status = 0;
713bail:
714 if (status < 0 && local_alloc_inode) {
715 mutex_unlock(&local_alloc_inode->i_mutex);
716 iput(local_alloc_inode);
717 }
718
719 trace_ocfs2_reserve_local_alloc_bits(
720 (unsigned long long)ac->ac_max_block,
721 bits_wanted, osb->slot_num, status);
722
723 if (status)
724 mlog_errno(status);
725 return status;
726}
727
728int ocfs2_claim_local_alloc_bits(struct ocfs2_super *osb,
729 handle_t *handle,
730 struct ocfs2_alloc_context *ac,
731 u32 bits_wanted,
732 u32 *bit_off,
733 u32 *num_bits)
734{
735 int status, start;
736 struct inode *local_alloc_inode;
737 void *bitmap;
738 struct ocfs2_dinode *alloc;
739 struct ocfs2_local_alloc *la;
740
741 BUG_ON(ac->ac_which != OCFS2_AC_USE_LOCAL);
742
743 local_alloc_inode = ac->ac_inode;
744 alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
745 la = OCFS2_LOCAL_ALLOC(alloc);
746
747 start = ocfs2_local_alloc_find_clear_bits(osb, alloc, &bits_wanted,
748 ac->ac_resv);
749 if (start == -1) {
750 /* TODO: Shouldn't we just BUG here? */
751 status = -ENOSPC;
752 mlog_errno(status);
753 goto bail;
754 }
755
756 bitmap = la->la_bitmap;
757 *bit_off = le32_to_cpu(la->la_bm_off) + start;
758 *num_bits = bits_wanted;
759
760 status = ocfs2_journal_access_di(handle,
761 INODE_CACHE(local_alloc_inode),
762 osb->local_alloc_bh,
763 OCFS2_JOURNAL_ACCESS_WRITE);
764 if (status < 0) {
765 mlog_errno(status);
766 goto bail;
767 }
768
769 ocfs2_resmap_claimed_bits(&osb->osb_la_resmap, ac->ac_resv, start,
770 bits_wanted);
771
772 while(bits_wanted--)
773 ocfs2_set_bit(start++, bitmap);
774
775 le32_add_cpu(&alloc->id1.bitmap1.i_used, *num_bits);
776 ocfs2_journal_dirty(handle, osb->local_alloc_bh);
777
778bail:
779 if (status)
780 mlog_errno(status);
781 return status;
782}
783
784int ocfs2_free_local_alloc_bits(struct ocfs2_super *osb,
785 handle_t *handle,
786 struct ocfs2_alloc_context *ac,
787 u32 bit_off,
788 u32 num_bits)
789{
790 int status, start;
791 u32 clear_bits;
792 struct inode *local_alloc_inode;
793 void *bitmap;
794 struct ocfs2_dinode *alloc;
795 struct ocfs2_local_alloc *la;
796
797 BUG_ON(ac->ac_which != OCFS2_AC_USE_LOCAL);
798
799 local_alloc_inode = ac->ac_inode;
800 alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
801 la = OCFS2_LOCAL_ALLOC(alloc);
802
803 bitmap = la->la_bitmap;
804 start = bit_off - le32_to_cpu(la->la_bm_off);
805 clear_bits = num_bits;
806
807 status = ocfs2_journal_access_di(handle,
808 INODE_CACHE(local_alloc_inode),
809 osb->local_alloc_bh,
810 OCFS2_JOURNAL_ACCESS_WRITE);
811 if (status < 0) {
812 mlog_errno(status);
813 goto bail;
814 }
815
816 while (clear_bits--)
817 ocfs2_clear_bit(start++, bitmap);
818
819 le32_add_cpu(&alloc->id1.bitmap1.i_used, -num_bits);
820 ocfs2_journal_dirty(handle, osb->local_alloc_bh);
821
822bail:
823 return status;
824}
825
826static u32 ocfs2_local_alloc_count_bits(struct ocfs2_dinode *alloc)
827{
828 u32 count;
829 struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc);
830
831 count = memweight(la->la_bitmap, le16_to_cpu(la->la_size));
832
833 trace_ocfs2_local_alloc_count_bits(count);
834 return count;
835}
836
837static int ocfs2_local_alloc_find_clear_bits(struct ocfs2_super *osb,
838 struct ocfs2_dinode *alloc,
839 u32 *numbits,
840 struct ocfs2_alloc_reservation *resv)
841{
842 int numfound, bitoff, left, startoff, lastzero;
843 int local_resv = 0;
844 struct ocfs2_alloc_reservation r;
845 void *bitmap = NULL;
846 struct ocfs2_reservation_map *resmap = &osb->osb_la_resmap;
847
848 if (!alloc->id1.bitmap1.i_total) {
849 bitoff = -1;
850 goto bail;
851 }
852
853 if (!resv) {
854 local_resv = 1;
855 ocfs2_resv_init_once(&r);
856 ocfs2_resv_set_type(&r, OCFS2_RESV_FLAG_TMP);
857 resv = &r;
858 }
859
860 numfound = *numbits;
861 if (ocfs2_resmap_resv_bits(resmap, resv, &bitoff, &numfound) == 0) {
862 if (numfound < *numbits)
863 *numbits = numfound;
864 goto bail;
865 }
866
867 /*
868 * Code error. While reservations are enabled, local
869 * allocation should _always_ go through them.
870 */
871 BUG_ON(osb->osb_resv_level != 0);
872
873 /*
874 * Reservations are disabled. Handle this the old way.
875 */
876
877 bitmap = OCFS2_LOCAL_ALLOC(alloc)->la_bitmap;
878
879 numfound = bitoff = startoff = 0;
880 lastzero = -1;
881 left = le32_to_cpu(alloc->id1.bitmap1.i_total);
882 while ((bitoff = ocfs2_find_next_zero_bit(bitmap, left, startoff)) != -1) {
883 if (bitoff == left) {
884 /* mlog(0, "bitoff (%d) == left", bitoff); */
885 break;
886 }
887 /* mlog(0, "Found a zero: bitoff = %d, startoff = %d, "
888 "numfound = %d\n", bitoff, startoff, numfound);*/
889
890 /* Ok, we found a zero bit... is it contig. or do we
891 * start over?*/
892 if (bitoff == startoff) {
893 /* we found a zero */
894 numfound++;
895 startoff++;
896 } else {
897 /* got a zero after some ones */
898 numfound = 1;
899 startoff = bitoff+1;
900 }
901 /* we got everything we needed */
902 if (numfound == *numbits) {
903 /* mlog(0, "Found it all!\n"); */
904 break;
905 }
906 }
907
908 trace_ocfs2_local_alloc_find_clear_bits_search_bitmap(bitoff, numfound);
909
910 if (numfound == *numbits)
911 bitoff = startoff - numfound;
912 else
913 bitoff = -1;
914
915bail:
916 if (local_resv)
917 ocfs2_resv_discard(resmap, resv);
918
919 trace_ocfs2_local_alloc_find_clear_bits(*numbits,
920 le32_to_cpu(alloc->id1.bitmap1.i_total),
921 bitoff, numfound);
922
923 return bitoff;
924}
925
926static void ocfs2_clear_local_alloc(struct ocfs2_dinode *alloc)
927{
928 struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc);
929 int i;
930
931 alloc->id1.bitmap1.i_total = 0;
932 alloc->id1.bitmap1.i_used = 0;
933 la->la_bm_off = 0;
934 for(i = 0; i < le16_to_cpu(la->la_size); i++)
935 la->la_bitmap[i] = 0;
936}
937
938#if 0
939/* turn this on and uncomment below to aid debugging window shifts. */
940static void ocfs2_verify_zero_bits(unsigned long *bitmap,
941 unsigned int start,
942 unsigned int count)
943{
944 unsigned int tmp = count;
945 while(tmp--) {
946 if (ocfs2_test_bit(start + tmp, bitmap)) {
947 printk("ocfs2_verify_zero_bits: start = %u, count = "
948 "%u\n", start, count);
949 printk("ocfs2_verify_zero_bits: bit %u is set!",
950 start + tmp);
951 BUG();
952 }
953 }
954}
955#endif
956
957/*
958 * sync the local alloc to main bitmap.
959 *
960 * assumes you've already locked the main bitmap -- the bitmap inode
961 * passed is used for caching.
962 */
963static int ocfs2_sync_local_to_main(struct ocfs2_super *osb,
964 handle_t *handle,
965 struct ocfs2_dinode *alloc,
966 struct inode *main_bm_inode,
967 struct buffer_head *main_bm_bh)
968{
969 int status = 0;
970 int bit_off, left, count, start;
971 u64 la_start_blk;
972 u64 blkno;
973 void *bitmap;
974 struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc);
975
976 trace_ocfs2_sync_local_to_main(
977 le32_to_cpu(alloc->id1.bitmap1.i_total),
978 le32_to_cpu(alloc->id1.bitmap1.i_used));
979
980 if (!alloc->id1.bitmap1.i_total) {
981 goto bail;
982 }
983
984 if (le32_to_cpu(alloc->id1.bitmap1.i_used) ==
985 le32_to_cpu(alloc->id1.bitmap1.i_total)) {
986 goto bail;
987 }
988
989 la_start_blk = ocfs2_clusters_to_blocks(osb->sb,
990 le32_to_cpu(la->la_bm_off));
991 bitmap = la->la_bitmap;
992 start = count = bit_off = 0;
993 left = le32_to_cpu(alloc->id1.bitmap1.i_total);
994
995 while ((bit_off = ocfs2_find_next_zero_bit(bitmap, left, start))
996 != -1) {
997 if ((bit_off < left) && (bit_off == start)) {
998 count++;
999 start++;
1000 continue;
1001 }
1002 if (count) {
1003 blkno = la_start_blk +
1004 ocfs2_clusters_to_blocks(osb->sb,
1005 start - count);
1006
1007 trace_ocfs2_sync_local_to_main_free(
1008 count, start - count,
1009 (unsigned long long)la_start_blk,
1010 (unsigned long long)blkno);
1011
1012 status = ocfs2_release_clusters(handle,
1013 main_bm_inode,
1014 main_bm_bh, blkno,
1015 count);
1016 if (status < 0) {
1017 mlog_errno(status);
1018 goto bail;
1019 }
1020 }
1021 if (bit_off >= left)
1022 break;
1023 count = 1;
1024 start = bit_off + 1;
1025 }
1026
1027bail:
1028 if (status)
1029 mlog_errno(status);
1030 return status;
1031}
1032
1033enum ocfs2_la_event {
1034 OCFS2_LA_EVENT_SLIDE, /* Normal window slide. */
1035 OCFS2_LA_EVENT_FRAGMENTED, /* The global bitmap has
1036 * enough bits theoretically
1037 * free, but a contiguous
1038 * allocation could not be
1039 * found. */
1040 OCFS2_LA_EVENT_ENOSPC, /* Global bitmap doesn't have
1041 * enough bits free to satisfy
1042 * our request. */
1043};
1044#define OCFS2_LA_ENABLE_INTERVAL (30 * HZ)
1045/*
1046 * Given an event, calculate the size of our next local alloc window.
1047 *
1048 * This should always be called under i_mutex of the local alloc inode
1049 * so that local alloc disabling doesn't race with processes trying to
1050 * use the allocator.
1051 *
1052 * Returns the state which the local alloc was left in. This value can
1053 * be ignored by some paths.
1054 */
1055static int ocfs2_recalc_la_window(struct ocfs2_super *osb,
1056 enum ocfs2_la_event event)
1057{
1058 unsigned int bits;
1059 int state;
1060
1061 spin_lock(&osb->osb_lock);
1062 if (osb->local_alloc_state == OCFS2_LA_DISABLED) {
1063 WARN_ON_ONCE(osb->local_alloc_state == OCFS2_LA_DISABLED);
1064 goto out_unlock;
1065 }
1066
1067 /*
1068 * ENOSPC and fragmentation are treated similarly for now.
1069 */
1070 if (event == OCFS2_LA_EVENT_ENOSPC ||
1071 event == OCFS2_LA_EVENT_FRAGMENTED) {
1072 /*
1073 * We ran out of contiguous space in the primary
1074 * bitmap. Drastically reduce the number of bits used
1075 * by local alloc until we have to disable it.
1076 */
1077 bits = osb->local_alloc_bits >> 1;
1078 if (bits > ocfs2_megabytes_to_clusters(osb->sb, 1)) {
1079 /*
1080 * By setting state to THROTTLED, we'll keep
1081 * the number of local alloc bits used down
1082 * until an event occurs which would give us
1083 * reason to assume the bitmap situation might
1084 * have changed.
1085 */
1086 osb->local_alloc_state = OCFS2_LA_THROTTLED;
1087 osb->local_alloc_bits = bits;
1088 } else {
1089 osb->local_alloc_state = OCFS2_LA_DISABLED;
1090 }
1091 queue_delayed_work(ocfs2_wq, &osb->la_enable_wq,
1092 OCFS2_LA_ENABLE_INTERVAL);
1093 goto out_unlock;
1094 }
1095
1096 /*
1097 * Don't increase the size of the local alloc window until we
1098 * know we might be able to fulfill the request. Otherwise, we
1099 * risk bouncing around the global bitmap during periods of
1100 * low space.
1101 */
1102 if (osb->local_alloc_state != OCFS2_LA_THROTTLED)
1103 osb->local_alloc_bits = osb->local_alloc_default_bits;
1104
1105out_unlock:
1106 state = osb->local_alloc_state;
1107 spin_unlock(&osb->osb_lock);
1108
1109 return state;
1110}
1111
1112static int ocfs2_local_alloc_reserve_for_window(struct ocfs2_super *osb,
1113 struct ocfs2_alloc_context **ac,
1114 struct inode **bitmap_inode,
1115 struct buffer_head **bitmap_bh)
1116{
1117 int status;
1118
1119 *ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
1120 if (!(*ac)) {
1121 status = -ENOMEM;
1122 mlog_errno(status);
1123 goto bail;
1124 }
1125
1126retry_enospc:
1127 (*ac)->ac_bits_wanted = osb->local_alloc_bits;
1128 status = ocfs2_reserve_cluster_bitmap_bits(osb, *ac);
1129 if (status == -ENOSPC) {
1130 if (ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_ENOSPC) ==
1131 OCFS2_LA_DISABLED)
1132 goto bail;
1133
1134 ocfs2_free_ac_resource(*ac);
1135 memset(*ac, 0, sizeof(struct ocfs2_alloc_context));
1136 goto retry_enospc;
1137 }
1138 if (status < 0) {
1139 mlog_errno(status);
1140 goto bail;
1141 }
1142
1143 *bitmap_inode = (*ac)->ac_inode;
1144 igrab(*bitmap_inode);
1145 *bitmap_bh = (*ac)->ac_bh;
1146 get_bh(*bitmap_bh);
1147 status = 0;
1148bail:
1149 if ((status < 0) && *ac) {
1150 ocfs2_free_alloc_context(*ac);
1151 *ac = NULL;
1152 }
1153
1154 if (status)
1155 mlog_errno(status);
1156 return status;
1157}
1158
1159/*
1160 * pass it the bitmap lock in lock_bh if you have it.
1161 */
1162static int ocfs2_local_alloc_new_window(struct ocfs2_super *osb,
1163 handle_t *handle,
1164 struct ocfs2_alloc_context *ac)
1165{
1166 int status = 0;
1167 u32 cluster_off, cluster_count;
1168 struct ocfs2_dinode *alloc = NULL;
1169 struct ocfs2_local_alloc *la;
1170
1171 alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
1172 la = OCFS2_LOCAL_ALLOC(alloc);
1173
1174 trace_ocfs2_local_alloc_new_window(
1175 le32_to_cpu(alloc->id1.bitmap1.i_total),
1176 osb->local_alloc_bits);
1177
1178 /* Instruct the allocation code to try the most recently used
1179 * cluster group. We'll re-record the group used this pass
1180 * below. */
1181 ac->ac_last_group = osb->la_last_gd;
1182
1183 /* we used the generic suballoc reserve function, but we set
1184 * everything up nicely, so there's no reason why we can't use
1185 * the more specific cluster api to claim bits. */
1186 status = ocfs2_claim_clusters(handle, ac, osb->local_alloc_bits,
1187 &cluster_off, &cluster_count);
1188 if (status == -ENOSPC) {
1189retry_enospc:
1190 /*
1191 * Note: We could also try syncing the journal here to
1192 * allow use of any free bits which the current
1193 * transaction can't give us access to. --Mark
1194 */
1195 if (ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_FRAGMENTED) ==
1196 OCFS2_LA_DISABLED)
1197 goto bail;
1198
1199 ac->ac_bits_wanted = osb->local_alloc_bits;
1200 status = ocfs2_claim_clusters(handle, ac,
1201 osb->local_alloc_bits,
1202 &cluster_off,
1203 &cluster_count);
1204 if (status == -ENOSPC)
1205 goto retry_enospc;
1206 /*
1207 * We only shrunk the *minimum* number of in our
1208 * request - it's entirely possible that the allocator
1209 * might give us more than we asked for.
1210 */
1211 if (status == 0) {
1212 spin_lock(&osb->osb_lock);
1213 osb->local_alloc_bits = cluster_count;
1214 spin_unlock(&osb->osb_lock);
1215 }
1216 }
1217 if (status < 0) {
1218 if (status != -ENOSPC)
1219 mlog_errno(status);
1220 goto bail;
1221 }
1222
1223 osb->la_last_gd = ac->ac_last_group;
1224
1225 la->la_bm_off = cpu_to_le32(cluster_off);
1226 alloc->id1.bitmap1.i_total = cpu_to_le32(cluster_count);
1227 /* just in case... In the future when we find space ourselves,
1228 * we don't have to get all contiguous -- but we'll have to
1229 * set all previously used bits in bitmap and update
1230 * la_bits_set before setting the bits in the main bitmap. */
1231 alloc->id1.bitmap1.i_used = 0;
1232 memset(OCFS2_LOCAL_ALLOC(alloc)->la_bitmap, 0,
1233 le16_to_cpu(la->la_size));
1234
1235 ocfs2_resmap_restart(&osb->osb_la_resmap, cluster_count,
1236 OCFS2_LOCAL_ALLOC(alloc)->la_bitmap);
1237
1238 trace_ocfs2_local_alloc_new_window_result(
1239 OCFS2_LOCAL_ALLOC(alloc)->la_bm_off,
1240 le32_to_cpu(alloc->id1.bitmap1.i_total));
1241
1242bail:
1243 if (status)
1244 mlog_errno(status);
1245 return status;
1246}
1247
1248/* Note that we do *NOT* lock the local alloc inode here as
1249 * it's been locked already for us. */
1250static int ocfs2_local_alloc_slide_window(struct ocfs2_super *osb,
1251 struct inode *local_alloc_inode)
1252{
1253 int status = 0;
1254 struct buffer_head *main_bm_bh = NULL;
1255 struct inode *main_bm_inode = NULL;
1256 handle_t *handle = NULL;
1257 struct ocfs2_dinode *alloc;
1258 struct ocfs2_dinode *alloc_copy = NULL;
1259 struct ocfs2_alloc_context *ac = NULL;
1260
1261 ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_SLIDE);
1262
1263 /* This will lock the main bitmap for us. */
1264 status = ocfs2_local_alloc_reserve_for_window(osb,
1265 &ac,
1266 &main_bm_inode,
1267 &main_bm_bh);
1268 if (status < 0) {
1269 if (status != -ENOSPC)
1270 mlog_errno(status);
1271 goto bail;
1272 }
1273
1274 handle = ocfs2_start_trans(osb, OCFS2_WINDOW_MOVE_CREDITS);
1275 if (IS_ERR(handle)) {
1276 status = PTR_ERR(handle);
1277 handle = NULL;
1278 mlog_errno(status);
1279 goto bail;
1280 }
1281
1282 alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
1283
1284 /* We want to clear the local alloc before doing anything
1285 * else, so that if we error later during this operation,
1286 * local alloc shutdown won't try to double free main bitmap
1287 * bits. Make a copy so the sync function knows which bits to
1288 * free. */
1289 alloc_copy = kmalloc(osb->local_alloc_bh->b_size, GFP_NOFS);
1290 if (!alloc_copy) {
1291 status = -ENOMEM;
1292 mlog_errno(status);
1293 goto bail;
1294 }
1295 memcpy(alloc_copy, alloc, osb->local_alloc_bh->b_size);
1296
1297 status = ocfs2_journal_access_di(handle,
1298 INODE_CACHE(local_alloc_inode),
1299 osb->local_alloc_bh,
1300 OCFS2_JOURNAL_ACCESS_WRITE);
1301 if (status < 0) {
1302 mlog_errno(status);
1303 goto bail;
1304 }
1305
1306 ocfs2_clear_local_alloc(alloc);
1307 ocfs2_journal_dirty(handle, osb->local_alloc_bh);
1308
1309 status = ocfs2_sync_local_to_main(osb, handle, alloc_copy,
1310 main_bm_inode, main_bm_bh);
1311 if (status < 0) {
1312 mlog_errno(status);
1313 goto bail;
1314 }
1315
1316 status = ocfs2_local_alloc_new_window(osb, handle, ac);
1317 if (status < 0) {
1318 if (status != -ENOSPC)
1319 mlog_errno(status);
1320 goto bail;
1321 }
1322
1323 atomic_inc(&osb->alloc_stats.moves);
1324
1325bail:
1326 if (handle)
1327 ocfs2_commit_trans(osb, handle);
1328
1329 brelse(main_bm_bh);
1330
1331 if (main_bm_inode)
1332 iput(main_bm_inode);
1333
1334 kfree(alloc_copy);
1335
1336 if (ac)
1337 ocfs2_free_alloc_context(ac);
1338
1339 if (status)
1340 mlog_errno(status);
1341 return status;
1342}
1343
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 int i;
909
910 alloc->id1.bitmap1.i_total = 0;
911 alloc->id1.bitmap1.i_used = 0;
912 la->la_bm_off = 0;
913 for(i = 0; i < le16_to_cpu(la->la_size); i++)
914 la->la_bitmap[i] = 0;
915}
916
917#if 0
918/* turn this on and uncomment below to aid debugging window shifts. */
919static void ocfs2_verify_zero_bits(unsigned long *bitmap,
920 unsigned int start,
921 unsigned int count)
922{
923 unsigned int tmp = count;
924 while(tmp--) {
925 if (ocfs2_test_bit(start + tmp, bitmap)) {
926 printk("ocfs2_verify_zero_bits: start = %u, count = "
927 "%u\n", start, count);
928 printk("ocfs2_verify_zero_bits: bit %u is set!",
929 start + tmp);
930 BUG();
931 }
932 }
933}
934#endif
935
936/*
937 * sync the local alloc to main bitmap.
938 *
939 * assumes you've already locked the main bitmap -- the bitmap inode
940 * passed is used for caching.
941 */
942static int ocfs2_sync_local_to_main(struct ocfs2_super *osb,
943 handle_t *handle,
944 struct ocfs2_dinode *alloc,
945 struct inode *main_bm_inode,
946 struct buffer_head *main_bm_bh)
947{
948 int status = 0;
949 int bit_off, left, count, start;
950 u64 la_start_blk;
951 u64 blkno;
952 void *bitmap;
953 struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc);
954
955 trace_ocfs2_sync_local_to_main(
956 le32_to_cpu(alloc->id1.bitmap1.i_total),
957 le32_to_cpu(alloc->id1.bitmap1.i_used));
958
959 if (!alloc->id1.bitmap1.i_total) {
960 goto bail;
961 }
962
963 if (le32_to_cpu(alloc->id1.bitmap1.i_used) ==
964 le32_to_cpu(alloc->id1.bitmap1.i_total)) {
965 goto bail;
966 }
967
968 la_start_blk = ocfs2_clusters_to_blocks(osb->sb,
969 le32_to_cpu(la->la_bm_off));
970 bitmap = la->la_bitmap;
971 start = count = 0;
972 left = le32_to_cpu(alloc->id1.bitmap1.i_total);
973
974 while (1) {
975 bit_off = ocfs2_find_next_zero_bit(bitmap, left, start);
976 if ((bit_off < left) && (bit_off == start)) {
977 count++;
978 start++;
979 continue;
980 }
981 if (count) {
982 blkno = la_start_blk +
983 ocfs2_clusters_to_blocks(osb->sb,
984 start - count);
985
986 trace_ocfs2_sync_local_to_main_free(
987 count, start - count,
988 (unsigned long long)la_start_blk,
989 (unsigned long long)blkno);
990
991 status = ocfs2_release_clusters(handle,
992 main_bm_inode,
993 main_bm_bh, blkno,
994 count);
995 if (status < 0) {
996 mlog_errno(status);
997 goto bail;
998 }
999 }
1000
1001 if (bit_off >= left)
1002 break;
1003 count = 1;
1004 start = bit_off + 1;
1005 }
1006
1007bail:
1008 if (status)
1009 mlog_errno(status);
1010 return status;
1011}
1012
1013enum ocfs2_la_event {
1014 OCFS2_LA_EVENT_SLIDE, /* Normal window slide. */
1015 OCFS2_LA_EVENT_FRAGMENTED, /* The global bitmap has
1016 * enough bits theoretically
1017 * free, but a contiguous
1018 * allocation could not be
1019 * found. */
1020 OCFS2_LA_EVENT_ENOSPC, /* Global bitmap doesn't have
1021 * enough bits free to satisfy
1022 * our request. */
1023};
1024#define OCFS2_LA_ENABLE_INTERVAL (30 * HZ)
1025/*
1026 * Given an event, calculate the size of our next local alloc window.
1027 *
1028 * This should always be called under i_rwsem of the local alloc inode
1029 * so that local alloc disabling doesn't race with processes trying to
1030 * use the allocator.
1031 *
1032 * Returns the state which the local alloc was left in. This value can
1033 * be ignored by some paths.
1034 */
1035static int ocfs2_recalc_la_window(struct ocfs2_super *osb,
1036 enum ocfs2_la_event event)
1037{
1038 unsigned int bits;
1039 int state;
1040
1041 spin_lock(&osb->osb_lock);
1042 if (osb->local_alloc_state == OCFS2_LA_DISABLED) {
1043 WARN_ON_ONCE(osb->local_alloc_state == OCFS2_LA_DISABLED);
1044 goto out_unlock;
1045 }
1046
1047 /*
1048 * ENOSPC and fragmentation are treated similarly for now.
1049 */
1050 if (event == OCFS2_LA_EVENT_ENOSPC ||
1051 event == OCFS2_LA_EVENT_FRAGMENTED) {
1052 /*
1053 * We ran out of contiguous space in the primary
1054 * bitmap. Drastically reduce the number of bits used
1055 * by local alloc until we have to disable it.
1056 */
1057 bits = osb->local_alloc_bits >> 1;
1058 if (bits > ocfs2_megabytes_to_clusters(osb->sb, 1)) {
1059 /*
1060 * By setting state to THROTTLED, we'll keep
1061 * the number of local alloc bits used down
1062 * until an event occurs which would give us
1063 * reason to assume the bitmap situation might
1064 * have changed.
1065 */
1066 osb->local_alloc_state = OCFS2_LA_THROTTLED;
1067 osb->local_alloc_bits = bits;
1068 } else {
1069 osb->local_alloc_state = OCFS2_LA_DISABLED;
1070 }
1071 queue_delayed_work(osb->ocfs2_wq, &osb->la_enable_wq,
1072 OCFS2_LA_ENABLE_INTERVAL);
1073 goto out_unlock;
1074 }
1075
1076 /*
1077 * Don't increase the size of the local alloc window until we
1078 * know we might be able to fulfill the request. Otherwise, we
1079 * risk bouncing around the global bitmap during periods of
1080 * low space.
1081 */
1082 if (osb->local_alloc_state != OCFS2_LA_THROTTLED)
1083 osb->local_alloc_bits = osb->local_alloc_default_bits;
1084
1085out_unlock:
1086 state = osb->local_alloc_state;
1087 spin_unlock(&osb->osb_lock);
1088
1089 return state;
1090}
1091
1092static int ocfs2_local_alloc_reserve_for_window(struct ocfs2_super *osb,
1093 struct ocfs2_alloc_context **ac,
1094 struct inode **bitmap_inode,
1095 struct buffer_head **bitmap_bh)
1096{
1097 int status;
1098
1099 *ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
1100 if (!(*ac)) {
1101 status = -ENOMEM;
1102 mlog_errno(status);
1103 goto bail;
1104 }
1105
1106retry_enospc:
1107 (*ac)->ac_bits_wanted = osb->local_alloc_bits;
1108 status = ocfs2_reserve_cluster_bitmap_bits(osb, *ac);
1109 if (status == -ENOSPC) {
1110 if (ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_ENOSPC) ==
1111 OCFS2_LA_DISABLED)
1112 goto bail;
1113
1114 ocfs2_free_ac_resource(*ac);
1115 memset(*ac, 0, sizeof(struct ocfs2_alloc_context));
1116 goto retry_enospc;
1117 }
1118 if (status < 0) {
1119 mlog_errno(status);
1120 goto bail;
1121 }
1122
1123 *bitmap_inode = (*ac)->ac_inode;
1124 igrab(*bitmap_inode);
1125 *bitmap_bh = (*ac)->ac_bh;
1126 get_bh(*bitmap_bh);
1127 status = 0;
1128bail:
1129 if ((status < 0) && *ac) {
1130 ocfs2_free_alloc_context(*ac);
1131 *ac = NULL;
1132 }
1133
1134 if (status)
1135 mlog_errno(status);
1136 return status;
1137}
1138
1139/*
1140 * pass it the bitmap lock in lock_bh if you have it.
1141 */
1142static int ocfs2_local_alloc_new_window(struct ocfs2_super *osb,
1143 handle_t *handle,
1144 struct ocfs2_alloc_context *ac)
1145{
1146 int status = 0;
1147 u32 cluster_off, cluster_count;
1148 struct ocfs2_dinode *alloc = NULL;
1149 struct ocfs2_local_alloc *la;
1150
1151 alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
1152 la = OCFS2_LOCAL_ALLOC(alloc);
1153
1154 trace_ocfs2_local_alloc_new_window(
1155 le32_to_cpu(alloc->id1.bitmap1.i_total),
1156 osb->local_alloc_bits);
1157
1158 /* Instruct the allocation code to try the most recently used
1159 * cluster group. We'll re-record the group used this pass
1160 * below. */
1161 ac->ac_last_group = osb->la_last_gd;
1162
1163 /* we used the generic suballoc reserve function, but we set
1164 * everything up nicely, so there's no reason why we can't use
1165 * the more specific cluster api to claim bits. */
1166 status = ocfs2_claim_clusters(handle, ac, osb->local_alloc_bits,
1167 &cluster_off, &cluster_count);
1168 if (status == -ENOSPC) {
1169retry_enospc:
1170 /*
1171 * Note: We could also try syncing the journal here to
1172 * allow use of any free bits which the current
1173 * transaction can't give us access to. --Mark
1174 */
1175 if (ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_FRAGMENTED) ==
1176 OCFS2_LA_DISABLED)
1177 goto bail;
1178
1179 ac->ac_bits_wanted = osb->local_alloc_bits;
1180 status = ocfs2_claim_clusters(handle, ac,
1181 osb->local_alloc_bits,
1182 &cluster_off,
1183 &cluster_count);
1184 if (status == -ENOSPC)
1185 goto retry_enospc;
1186 /*
1187 * We only shrunk the *minimum* number of in our
1188 * request - it's entirely possible that the allocator
1189 * might give us more than we asked for.
1190 */
1191 if (status == 0) {
1192 spin_lock(&osb->osb_lock);
1193 osb->local_alloc_bits = cluster_count;
1194 spin_unlock(&osb->osb_lock);
1195 }
1196 }
1197 if (status < 0) {
1198 if (status != -ENOSPC)
1199 mlog_errno(status);
1200 goto bail;
1201 }
1202
1203 osb->la_last_gd = ac->ac_last_group;
1204
1205 la->la_bm_off = cpu_to_le32(cluster_off);
1206 alloc->id1.bitmap1.i_total = cpu_to_le32(cluster_count);
1207 /* just in case... In the future when we find space ourselves,
1208 * we don't have to get all contiguous -- but we'll have to
1209 * set all previously used bits in bitmap and update
1210 * la_bits_set before setting the bits in the main bitmap. */
1211 alloc->id1.bitmap1.i_used = 0;
1212 memset(OCFS2_LOCAL_ALLOC(alloc)->la_bitmap, 0,
1213 le16_to_cpu(la->la_size));
1214
1215 ocfs2_resmap_restart(&osb->osb_la_resmap, cluster_count,
1216 OCFS2_LOCAL_ALLOC(alloc)->la_bitmap);
1217
1218 trace_ocfs2_local_alloc_new_window_result(
1219 le32_to_cpu(OCFS2_LOCAL_ALLOC(alloc)->la_bm_off),
1220 le32_to_cpu(alloc->id1.bitmap1.i_total));
1221
1222bail:
1223 if (status)
1224 mlog_errno(status);
1225 return status;
1226}
1227
1228/* Note that we do *NOT* lock the local alloc inode here as
1229 * it's been locked already for us. */
1230static int ocfs2_local_alloc_slide_window(struct ocfs2_super *osb,
1231 struct inode *local_alloc_inode)
1232{
1233 int status = 0;
1234 struct buffer_head *main_bm_bh = NULL;
1235 struct inode *main_bm_inode = NULL;
1236 handle_t *handle = NULL;
1237 struct ocfs2_dinode *alloc;
1238 struct ocfs2_dinode *alloc_copy = NULL;
1239 struct ocfs2_alloc_context *ac = NULL;
1240
1241 ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_SLIDE);
1242
1243 /* This will lock the main bitmap for us. */
1244 status = ocfs2_local_alloc_reserve_for_window(osb,
1245 &ac,
1246 &main_bm_inode,
1247 &main_bm_bh);
1248 if (status < 0) {
1249 if (status != -ENOSPC)
1250 mlog_errno(status);
1251 goto bail;
1252 }
1253
1254 handle = ocfs2_start_trans(osb, OCFS2_WINDOW_MOVE_CREDITS);
1255 if (IS_ERR(handle)) {
1256 status = PTR_ERR(handle);
1257 handle = NULL;
1258 mlog_errno(status);
1259 goto bail;
1260 }
1261
1262 alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
1263
1264 /* We want to clear the local alloc before doing anything
1265 * else, so that if we error later during this operation,
1266 * local alloc shutdown won't try to double free main bitmap
1267 * bits. Make a copy so the sync function knows which bits to
1268 * free. */
1269 alloc_copy = kmemdup(alloc, osb->local_alloc_bh->b_size, GFP_NOFS);
1270 if (!alloc_copy) {
1271 status = -ENOMEM;
1272 mlog_errno(status);
1273 goto bail;
1274 }
1275
1276 status = ocfs2_journal_access_di(handle,
1277 INODE_CACHE(local_alloc_inode),
1278 osb->local_alloc_bh,
1279 OCFS2_JOURNAL_ACCESS_WRITE);
1280 if (status < 0) {
1281 mlog_errno(status);
1282 goto bail;
1283 }
1284
1285 ocfs2_clear_local_alloc(alloc);
1286 ocfs2_journal_dirty(handle, osb->local_alloc_bh);
1287
1288 status = ocfs2_sync_local_to_main(osb, handle, alloc_copy,
1289 main_bm_inode, main_bm_bh);
1290 if (status < 0) {
1291 mlog_errno(status);
1292 goto bail;
1293 }
1294
1295 status = ocfs2_local_alloc_new_window(osb, handle, ac);
1296 if (status < 0) {
1297 if (status != -ENOSPC)
1298 mlog_errno(status);
1299 goto bail;
1300 }
1301
1302 atomic_inc(&osb->alloc_stats.moves);
1303
1304bail:
1305 if (handle)
1306 ocfs2_commit_trans(osb, handle);
1307
1308 brelse(main_bm_bh);
1309
1310 iput(main_bm_inode);
1311 kfree(alloc_copy);
1312
1313 if (ac)
1314 ocfs2_free_alloc_context(ac);
1315
1316 if (status)
1317 mlog_errno(status);
1318 return status;
1319}
1320