1 /* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
6 * Node local data allocation
8 * Copyright (C) 2002, 2004 Oracle. All rights reserved.
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.
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.
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.
27 #include <linux/types.h>
28 #include <linux/slab.h>
29 #include <linux/highmem.h>
30 #include <linux/bitops.h>
32 #define MLOG_MASK_PREFIX ML_DISK_ALLOC
33 #include <cluster/masklog.h>
41 #include "localalloc.h"
46 #include "buffer_head_io.h"
48 #define OCFS2_LOCAL_ALLOC(dinode) (&((dinode)->id2.i_lab))
50 static u32 ocfs2_local_alloc_count_bits(struct ocfs2_dinode *alloc);
52 static int ocfs2_local_alloc_find_clear_bits(struct ocfs2_super *osb,
53 struct ocfs2_dinode *alloc,
56 static void ocfs2_clear_local_alloc(struct ocfs2_dinode *alloc);
58 static int ocfs2_sync_local_to_main(struct ocfs2_super *osb,
60 struct ocfs2_dinode *alloc,
61 struct inode *main_bm_inode,
62 struct buffer_head *main_bm_bh);
64 static int ocfs2_local_alloc_reserve_for_window(struct ocfs2_super *osb,
65 struct ocfs2_alloc_context **ac,
66 struct inode **bitmap_inode,
67 struct buffer_head **bitmap_bh);
69 static int ocfs2_local_alloc_new_window(struct ocfs2_super *osb,
71 struct ocfs2_alloc_context *ac);
73 static int ocfs2_local_alloc_slide_window(struct ocfs2_super *osb,
74 struct inode *local_alloc_inode);
76 static inline int ocfs2_la_state_enabled(struct ocfs2_super *osb)
78 return (osb->local_alloc_state == OCFS2_LA_THROTTLED ||
79 osb->local_alloc_state == OCFS2_LA_ENABLED);
82 void ocfs2_local_alloc_seen_free_bits(struct ocfs2_super *osb,
83 unsigned int num_clusters)
85 spin_lock(&osb->osb_lock);
86 if (osb->local_alloc_state == OCFS2_LA_DISABLED ||
87 osb->local_alloc_state == OCFS2_LA_THROTTLED)
88 if (num_clusters >= osb->local_alloc_default_bits) {
89 cancel_delayed_work(&osb->la_enable_wq);
90 osb->local_alloc_state = OCFS2_LA_ENABLED;
92 spin_unlock(&osb->osb_lock);
95 void ocfs2_la_enable_worker(struct work_struct *work)
97 struct ocfs2_super *osb =
98 container_of(work, struct ocfs2_super,
100 spin_lock(&osb->osb_lock);
101 osb->local_alloc_state = OCFS2_LA_ENABLED;
102 spin_unlock(&osb->osb_lock);
106 * Tell us whether a given allocation should use the local alloc
107 * file. Otherwise, it has to go to the main bitmap.
109 * This function does semi-dirty reads of local alloc size and state!
110 * This is ok however, as the values are re-checked once under mutex.
112 int ocfs2_alloc_should_use_local(struct ocfs2_super *osb, u64 bits)
117 spin_lock(&osb->osb_lock);
118 la_bits = osb->local_alloc_bits;
120 if (!ocfs2_la_state_enabled(osb))
123 /* la_bits should be at least twice the size (in clusters) of
124 * a new block group. We want to be sure block group
125 * allocations go through the local alloc, so allow an
126 * allocation to take up to half the bitmap. */
127 if (bits > (la_bits / 2))
132 mlog(0, "state=%d, bits=%llu, la_bits=%d, ret=%d\n",
133 osb->local_alloc_state, (unsigned long long)bits, la_bits, ret);
134 spin_unlock(&osb->osb_lock);
138 int ocfs2_load_local_alloc(struct ocfs2_super *osb)
141 struct ocfs2_dinode *alloc = NULL;
142 struct buffer_head *alloc_bh = NULL;
144 struct inode *inode = NULL;
145 struct ocfs2_local_alloc *la;
149 if (osb->local_alloc_bits == 0)
152 if (osb->local_alloc_bits >= osb->bitmap_cpg) {
153 mlog(ML_NOTICE, "Requested local alloc window %d is larger "
154 "than max possible %u. Using defaults.\n",
155 osb->local_alloc_bits, (osb->bitmap_cpg - 1));
156 osb->local_alloc_bits =
157 ocfs2_megabytes_to_clusters(osb->sb,
158 OCFS2_DEFAULT_LOCAL_ALLOC_SIZE);
161 /* read the alloc off disk */
162 inode = ocfs2_get_system_file_inode(osb, LOCAL_ALLOC_SYSTEM_INODE,
170 status = ocfs2_read_block(osb, OCFS2_I(inode)->ip_blkno,
171 &alloc_bh, 0, inode);
177 alloc = (struct ocfs2_dinode *) alloc_bh->b_data;
178 la = OCFS2_LOCAL_ALLOC(alloc);
180 if (!(le32_to_cpu(alloc->i_flags) &
181 (OCFS2_LOCAL_ALLOC_FL|OCFS2_BITMAP_FL))) {
182 mlog(ML_ERROR, "Invalid local alloc inode, %llu\n",
183 (unsigned long long)OCFS2_I(inode)->ip_blkno);
188 if ((la->la_size == 0) ||
189 (le16_to_cpu(la->la_size) > ocfs2_local_alloc_size(inode->i_sb))) {
190 mlog(ML_ERROR, "Local alloc size is invalid (la_size = %u)\n",
191 le16_to_cpu(la->la_size));
196 /* do a little verification. */
197 num_used = ocfs2_local_alloc_count_bits(alloc);
199 /* hopefully the local alloc has always been recovered before
202 || alloc->id1.bitmap1.i_used
203 || alloc->id1.bitmap1.i_total
205 mlog(ML_ERROR, "Local alloc hasn't been recovered!\n"
206 "found = %u, set = %u, taken = %u, off = %u\n",
207 num_used, le32_to_cpu(alloc->id1.bitmap1.i_used),
208 le32_to_cpu(alloc->id1.bitmap1.i_total),
209 OCFS2_LOCAL_ALLOC(alloc)->la_bm_off);
211 osb->local_alloc_bh = alloc_bh;
212 osb->local_alloc_state = OCFS2_LA_ENABLED;
221 mlog(0, "Local alloc window bits = %d\n", osb->local_alloc_bits);
228 * return any unused bits to the bitmap and write out a clean
231 * local_alloc_bh is optional. If not passed, we will simply use the
232 * one off osb. If you do pass it however, be warned that it *will* be
233 * returned brelse'd and NULL'd out.*/
234 void ocfs2_shutdown_local_alloc(struct ocfs2_super *osb)
238 struct inode *local_alloc_inode = NULL;
239 struct buffer_head *bh = NULL;
240 struct buffer_head *main_bm_bh = NULL;
241 struct inode *main_bm_inode = NULL;
242 struct ocfs2_dinode *alloc_copy = NULL;
243 struct ocfs2_dinode *alloc = NULL;
247 cancel_delayed_work(&osb->la_enable_wq);
248 flush_workqueue(ocfs2_wq);
250 if (osb->local_alloc_state == OCFS2_LA_UNUSED)
254 ocfs2_get_system_file_inode(osb,
255 LOCAL_ALLOC_SYSTEM_INODE,
257 if (!local_alloc_inode) {
263 osb->local_alloc_state = OCFS2_LA_DISABLED;
265 main_bm_inode = ocfs2_get_system_file_inode(osb,
266 GLOBAL_BITMAP_SYSTEM_INODE,
268 if (!main_bm_inode) {
274 mutex_lock(&main_bm_inode->i_mutex);
276 status = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
282 /* WINDOW_MOVE_CREDITS is a bit heavy... */
283 handle = ocfs2_start_trans(osb, OCFS2_WINDOW_MOVE_CREDITS);
284 if (IS_ERR(handle)) {
285 mlog_errno(PTR_ERR(handle));
290 bh = osb->local_alloc_bh;
291 alloc = (struct ocfs2_dinode *) bh->b_data;
293 alloc_copy = kmalloc(bh->b_size, GFP_NOFS);
298 memcpy(alloc_copy, alloc, bh->b_size);
300 status = ocfs2_journal_access(handle, local_alloc_inode, bh,
301 OCFS2_JOURNAL_ACCESS_WRITE);
307 ocfs2_clear_local_alloc(alloc);
309 status = ocfs2_journal_dirty(handle, bh);
316 osb->local_alloc_bh = NULL;
317 osb->local_alloc_state = OCFS2_LA_UNUSED;
319 status = ocfs2_sync_local_to_main(osb, handle, alloc_copy,
320 main_bm_inode, main_bm_bh);
325 ocfs2_commit_trans(osb, handle);
331 ocfs2_inode_unlock(main_bm_inode, 1);
334 mutex_unlock(&main_bm_inode->i_mutex);
338 if (local_alloc_inode)
339 iput(local_alloc_inode);
348 * We want to free the bitmap bits outside of any recovery context as
349 * we'll need a cluster lock to do so, but we must clear the local
350 * alloc before giving up the recovered nodes journal. To solve this,
351 * we kmalloc a copy of the local alloc before it's change for the
352 * caller to process with ocfs2_complete_local_alloc_recovery
354 int ocfs2_begin_local_alloc_recovery(struct ocfs2_super *osb,
356 struct ocfs2_dinode **alloc_copy)
359 struct buffer_head *alloc_bh = NULL;
360 struct inode *inode = NULL;
361 struct ocfs2_dinode *alloc;
363 mlog_entry("(slot_num = %d)\n", slot_num);
367 inode = ocfs2_get_system_file_inode(osb,
368 LOCAL_ALLOC_SYSTEM_INODE,
376 mutex_lock(&inode->i_mutex);
378 status = ocfs2_read_block(osb, OCFS2_I(inode)->ip_blkno,
379 &alloc_bh, 0, inode);
385 *alloc_copy = kmalloc(alloc_bh->b_size, GFP_KERNEL);
386 if (!(*alloc_copy)) {
390 memcpy((*alloc_copy), alloc_bh->b_data, alloc_bh->b_size);
392 alloc = (struct ocfs2_dinode *) alloc_bh->b_data;
393 ocfs2_clear_local_alloc(alloc);
395 status = ocfs2_write_block(osb, alloc_bh, inode);
400 if ((status < 0) && (*alloc_copy)) {
409 mutex_unlock(&inode->i_mutex);
418 * Step 2: By now, we've completed the journal recovery, we've stamped
419 * a clean local alloc on disk and dropped the node out of the
420 * recovery map. Dlm locks will no longer stall, so lets clear out the
423 int ocfs2_complete_local_alloc_recovery(struct ocfs2_super *osb,
424 struct ocfs2_dinode *alloc)
428 struct buffer_head *main_bm_bh = NULL;
429 struct inode *main_bm_inode;
433 main_bm_inode = ocfs2_get_system_file_inode(osb,
434 GLOBAL_BITMAP_SYSTEM_INODE,
436 if (!main_bm_inode) {
442 mutex_lock(&main_bm_inode->i_mutex);
444 status = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
450 handle = ocfs2_start_trans(osb, OCFS2_WINDOW_MOVE_CREDITS);
451 if (IS_ERR(handle)) {
452 status = PTR_ERR(handle);
458 /* we want the bitmap change to be recorded on disk asap */
461 status = ocfs2_sync_local_to_main(osb, handle, alloc,
462 main_bm_inode, main_bm_bh);
466 ocfs2_commit_trans(osb, handle);
469 ocfs2_inode_unlock(main_bm_inode, 1);
472 mutex_unlock(&main_bm_inode->i_mutex);
481 ocfs2_init_inode_steal_slot(osb);
487 * make sure we've got at least bits_wanted contiguous bits in the
488 * local alloc. You lose them when you drop i_mutex.
490 * We will add ourselves to the transaction passed in, but may start
491 * our own in order to shift windows.
493 int ocfs2_reserve_local_alloc_bits(struct ocfs2_super *osb,
495 struct ocfs2_alloc_context *ac)
498 struct ocfs2_dinode *alloc;
499 struct inode *local_alloc_inode;
500 unsigned int free_bits;
507 ocfs2_get_system_file_inode(osb,
508 LOCAL_ALLOC_SYSTEM_INODE,
510 if (!local_alloc_inode) {
516 mutex_lock(&local_alloc_inode->i_mutex);
519 * We must double check state and allocator bits because
520 * another process may have changed them while holding i_mutex.
522 spin_lock(&osb->osb_lock);
523 if (!ocfs2_la_state_enabled(osb) ||
524 (bits_wanted > osb->local_alloc_bits)) {
525 spin_unlock(&osb->osb_lock);
529 spin_unlock(&osb->osb_lock);
531 alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
533 #ifdef CONFIG_OCFS2_DEBUG_FS
534 if (le32_to_cpu(alloc->id1.bitmap1.i_used) !=
535 ocfs2_local_alloc_count_bits(alloc)) {
536 ocfs2_error(osb->sb, "local alloc inode %llu says it has "
537 "%u free bits, but a count shows %u",
538 (unsigned long long)le64_to_cpu(alloc->i_blkno),
539 le32_to_cpu(alloc->id1.bitmap1.i_used),
540 ocfs2_local_alloc_count_bits(alloc));
546 free_bits = le32_to_cpu(alloc->id1.bitmap1.i_total) -
547 le32_to_cpu(alloc->id1.bitmap1.i_used);
548 if (bits_wanted > free_bits) {
549 /* uhoh, window change time. */
551 ocfs2_local_alloc_slide_window(osb, local_alloc_inode);
553 if (status != -ENOSPC)
559 * Under certain conditions, the window slide code
560 * might have reduced the number of bits available or
561 * disabled the the local alloc entirely. Re-check
562 * here and return -ENOSPC if necessary.
565 if (!ocfs2_la_state_enabled(osb))
568 free_bits = le32_to_cpu(alloc->id1.bitmap1.i_total) -
569 le32_to_cpu(alloc->id1.bitmap1.i_used);
570 if (bits_wanted > free_bits)
574 ac->ac_inode = local_alloc_inode;
575 /* We should never use localalloc from another slot */
576 ac->ac_alloc_slot = osb->slot_num;
577 ac->ac_which = OCFS2_AC_USE_LOCAL;
578 get_bh(osb->local_alloc_bh);
579 ac->ac_bh = osb->local_alloc_bh;
582 if (status < 0 && local_alloc_inode) {
583 mutex_unlock(&local_alloc_inode->i_mutex);
584 iput(local_alloc_inode);
587 mlog(0, "bits=%d, slot=%d, ret=%d\n", bits_wanted, osb->slot_num,
594 int ocfs2_claim_local_alloc_bits(struct ocfs2_super *osb,
596 struct ocfs2_alloc_context *ac,
602 struct inode *local_alloc_inode;
604 struct ocfs2_dinode *alloc;
605 struct ocfs2_local_alloc *la;
608 BUG_ON(ac->ac_which != OCFS2_AC_USE_LOCAL);
610 local_alloc_inode = ac->ac_inode;
611 alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
612 la = OCFS2_LOCAL_ALLOC(alloc);
614 start = ocfs2_local_alloc_find_clear_bits(osb, alloc, bits_wanted);
616 /* TODO: Shouldn't we just BUG here? */
622 bitmap = la->la_bitmap;
623 *bit_off = le32_to_cpu(la->la_bm_off) + start;
624 /* local alloc is always contiguous by nature -- we never
625 * delete bits from it! */
626 *num_bits = bits_wanted;
628 status = ocfs2_journal_access(handle, local_alloc_inode,
630 OCFS2_JOURNAL_ACCESS_WRITE);
637 ocfs2_set_bit(start++, bitmap);
639 le32_add_cpu(&alloc->id1.bitmap1.i_used, *num_bits);
641 status = ocfs2_journal_dirty(handle, osb->local_alloc_bh);
653 static u32 ocfs2_local_alloc_count_bits(struct ocfs2_dinode *alloc)
658 struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc);
662 buffer = la->la_bitmap;
663 for (i = 0; i < le16_to_cpu(la->la_size); i++)
664 count += hweight8(buffer[i]);
670 static int ocfs2_local_alloc_find_clear_bits(struct ocfs2_super *osb,
671 struct ocfs2_dinode *alloc,
674 int numfound, bitoff, left, startoff, lastzero;
677 mlog_entry("(numbits wanted = %u)\n", numbits);
679 if (!alloc->id1.bitmap1.i_total) {
680 mlog(0, "No bits in my window!\n");
685 bitmap = OCFS2_LOCAL_ALLOC(alloc)->la_bitmap;
687 numfound = bitoff = startoff = 0;
689 left = le32_to_cpu(alloc->id1.bitmap1.i_total);
690 while ((bitoff = ocfs2_find_next_zero_bit(bitmap, left, startoff)) != -1) {
691 if (bitoff == left) {
692 /* mlog(0, "bitoff (%d) == left", bitoff); */
695 /* mlog(0, "Found a zero: bitoff = %d, startoff = %d, "
696 "numfound = %d\n", bitoff, startoff, numfound);*/
698 /* Ok, we found a zero bit... is it contig. or do we
700 if (bitoff == startoff) {
701 /* we found a zero */
705 /* got a zero after some ones */
709 /* we got everything we needed */
710 if (numfound == numbits) {
711 /* mlog(0, "Found it all!\n"); */
716 mlog(0, "Exiting loop, bitoff = %d, numfound = %d\n", bitoff,
719 if (numfound == numbits)
720 bitoff = startoff - numfound;
729 static void ocfs2_clear_local_alloc(struct ocfs2_dinode *alloc)
731 struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc);
735 alloc->id1.bitmap1.i_total = 0;
736 alloc->id1.bitmap1.i_used = 0;
738 for(i = 0; i < le16_to_cpu(la->la_size); i++)
739 la->la_bitmap[i] = 0;
745 /* turn this on and uncomment below to aid debugging window shifts. */
746 static void ocfs2_verify_zero_bits(unsigned long *bitmap,
750 unsigned int tmp = count;
752 if (ocfs2_test_bit(start + tmp, bitmap)) {
753 printk("ocfs2_verify_zero_bits: start = %u, count = "
754 "%u\n", start, count);
755 printk("ocfs2_verify_zero_bits: bit %u is set!",
764 * sync the local alloc to main bitmap.
766 * assumes you've already locked the main bitmap -- the bitmap inode
767 * passed is used for caching.
769 static int ocfs2_sync_local_to_main(struct ocfs2_super *osb,
771 struct ocfs2_dinode *alloc,
772 struct inode *main_bm_inode,
773 struct buffer_head *main_bm_bh)
776 int bit_off, left, count, start;
780 struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc);
782 mlog_entry("total = %u, used = %u\n",
783 le32_to_cpu(alloc->id1.bitmap1.i_total),
784 le32_to_cpu(alloc->id1.bitmap1.i_used));
786 if (!alloc->id1.bitmap1.i_total) {
787 mlog(0, "nothing to sync!\n");
791 if (le32_to_cpu(alloc->id1.bitmap1.i_used) ==
792 le32_to_cpu(alloc->id1.bitmap1.i_total)) {
793 mlog(0, "all bits were taken!\n");
797 la_start_blk = ocfs2_clusters_to_blocks(osb->sb,
798 le32_to_cpu(la->la_bm_off));
799 bitmap = la->la_bitmap;
800 start = count = bit_off = 0;
801 left = le32_to_cpu(alloc->id1.bitmap1.i_total);
803 while ((bit_off = ocfs2_find_next_zero_bit(bitmap, left, start))
805 if ((bit_off < left) && (bit_off == start)) {
811 blkno = la_start_blk +
812 ocfs2_clusters_to_blocks(osb->sb,
815 mlog(0, "freeing %u bits starting at local alloc bit "
816 "%u (la_start_blk = %llu, blkno = %llu)\n",
817 count, start - count,
818 (unsigned long long)la_start_blk,
819 (unsigned long long)blkno);
821 status = ocfs2_free_clusters(handle, main_bm_inode,
822 main_bm_bh, blkno, count);
839 enum ocfs2_la_event {
840 OCFS2_LA_EVENT_SLIDE, /* Normal window slide. */
841 OCFS2_LA_EVENT_FRAGMENTED, /* The global bitmap has
842 * enough bits theoretically
843 * free, but a contiguous
844 * allocation could not be
846 OCFS2_LA_EVENT_ENOSPC, /* Global bitmap doesn't have
847 * enough bits free to satisfy
850 #define OCFS2_LA_ENABLE_INTERVAL (30 * HZ)
852 * Given an event, calculate the size of our next local alloc window.
854 * This should always be called under i_mutex of the local alloc inode
855 * so that local alloc disabling doesn't race with processes trying to
858 * Returns the state which the local alloc was left in. This value can
859 * be ignored by some paths.
861 static int ocfs2_recalc_la_window(struct ocfs2_super *osb,
862 enum ocfs2_la_event event)
867 spin_lock(&osb->osb_lock);
868 if (osb->local_alloc_state == OCFS2_LA_DISABLED) {
869 WARN_ON_ONCE(osb->local_alloc_state == OCFS2_LA_DISABLED);
874 * ENOSPC and fragmentation are treated similarly for now.
876 if (event == OCFS2_LA_EVENT_ENOSPC ||
877 event == OCFS2_LA_EVENT_FRAGMENTED) {
879 * We ran out of contiguous space in the primary
880 * bitmap. Drastically reduce the number of bits used
881 * by local alloc until we have to disable it.
883 bits = osb->local_alloc_bits >> 1;
884 if (bits > ocfs2_megabytes_to_clusters(osb->sb, 1)) {
886 * By setting state to THROTTLED, we'll keep
887 * the number of local alloc bits used down
888 * until an event occurs which would give us
889 * reason to assume the bitmap situation might
892 osb->local_alloc_state = OCFS2_LA_THROTTLED;
893 osb->local_alloc_bits = bits;
895 osb->local_alloc_state = OCFS2_LA_DISABLED;
897 queue_delayed_work(ocfs2_wq, &osb->la_enable_wq,
898 OCFS2_LA_ENABLE_INTERVAL);
903 * Don't increase the size of the local alloc window until we
904 * know we might be able to fulfill the request. Otherwise, we
905 * risk bouncing around the global bitmap during periods of
908 if (osb->local_alloc_state != OCFS2_LA_THROTTLED)
909 osb->local_alloc_bits = osb->local_alloc_default_bits;
912 state = osb->local_alloc_state;
913 spin_unlock(&osb->osb_lock);
918 static int ocfs2_local_alloc_reserve_for_window(struct ocfs2_super *osb,
919 struct ocfs2_alloc_context **ac,
920 struct inode **bitmap_inode,
921 struct buffer_head **bitmap_bh)
925 *ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
933 (*ac)->ac_bits_wanted = osb->local_alloc_bits;
935 status = ocfs2_reserve_cluster_bitmap_bits(osb, *ac);
936 if (status == -ENOSPC) {
937 if (ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_ENOSPC) ==
941 ocfs2_free_ac_resource(*ac);
942 memset(*ac, 0, sizeof(struct ocfs2_alloc_context));
950 *bitmap_inode = (*ac)->ac_inode;
951 igrab(*bitmap_inode);
952 *bitmap_bh = (*ac)->ac_bh;
956 if ((status < 0) && *ac) {
957 ocfs2_free_alloc_context(*ac);
966 * pass it the bitmap lock in lock_bh if you have it.
968 static int ocfs2_local_alloc_new_window(struct ocfs2_super *osb,
970 struct ocfs2_alloc_context *ac)
973 u32 cluster_off, cluster_count;
974 struct ocfs2_dinode *alloc = NULL;
975 struct ocfs2_local_alloc *la;
979 alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
980 la = OCFS2_LOCAL_ALLOC(alloc);
982 if (alloc->id1.bitmap1.i_total)
983 mlog(0, "asking me to alloc a new window over a non-empty "
986 mlog(0, "Allocating %u clusters for a new window.\n",
987 osb->local_alloc_bits);
989 /* Instruct the allocation code to try the most recently used
990 * cluster group. We'll re-record the group used this pass
992 ac->ac_last_group = osb->la_last_gd;
994 /* we used the generic suballoc reserve function, but we set
995 * everything up nicely, so there's no reason why we can't use
996 * the more specific cluster api to claim bits. */
997 status = ocfs2_claim_clusters(osb, handle, ac, osb->local_alloc_bits,
998 &cluster_off, &cluster_count);
999 if (status == -ENOSPC) {
1002 * Note: We could also try syncing the journal here to
1003 * allow use of any free bits which the current
1004 * transaction can't give us access to. --Mark
1006 if (ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_FRAGMENTED) ==
1010 status = ocfs2_claim_clusters(osb, handle, ac,
1011 osb->local_alloc_bits,
1014 if (status == -ENOSPC)
1017 * We only shrunk the *minimum* number of in our
1018 * request - it's entirely possible that the allocator
1019 * might give us more than we asked for.
1022 spin_lock(&osb->osb_lock);
1023 osb->local_alloc_bits = cluster_count;
1024 spin_unlock(&osb->osb_lock);
1028 if (status != -ENOSPC)
1033 osb->la_last_gd = ac->ac_last_group;
1035 la->la_bm_off = cpu_to_le32(cluster_off);
1036 alloc->id1.bitmap1.i_total = cpu_to_le32(cluster_count);
1037 /* just in case... In the future when we find space ourselves,
1038 * we don't have to get all contiguous -- but we'll have to
1039 * set all previously used bits in bitmap and update
1040 * la_bits_set before setting the bits in the main bitmap. */
1041 alloc->id1.bitmap1.i_used = 0;
1042 memset(OCFS2_LOCAL_ALLOC(alloc)->la_bitmap, 0,
1043 le16_to_cpu(la->la_size));
1045 mlog(0, "New window allocated:\n");
1046 mlog(0, "window la_bm_off = %u\n",
1047 OCFS2_LOCAL_ALLOC(alloc)->la_bm_off);
1048 mlog(0, "window bits = %u\n", le32_to_cpu(alloc->id1.bitmap1.i_total));
1055 /* Note that we do *NOT* lock the local alloc inode here as
1056 * it's been locked already for us. */
1057 static int ocfs2_local_alloc_slide_window(struct ocfs2_super *osb,
1058 struct inode *local_alloc_inode)
1061 struct buffer_head *main_bm_bh = NULL;
1062 struct inode *main_bm_inode = NULL;
1063 handle_t *handle = NULL;
1064 struct ocfs2_dinode *alloc;
1065 struct ocfs2_dinode *alloc_copy = NULL;
1066 struct ocfs2_alloc_context *ac = NULL;
1070 ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_SLIDE);
1072 /* This will lock the main bitmap for us. */
1073 status = ocfs2_local_alloc_reserve_for_window(osb,
1078 if (status != -ENOSPC)
1083 handle = ocfs2_start_trans(osb, OCFS2_WINDOW_MOVE_CREDITS);
1084 if (IS_ERR(handle)) {
1085 status = PTR_ERR(handle);
1091 alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
1093 /* We want to clear the local alloc before doing anything
1094 * else, so that if we error later during this operation,
1095 * local alloc shutdown won't try to double free main bitmap
1096 * bits. Make a copy so the sync function knows which bits to
1098 alloc_copy = kmalloc(osb->local_alloc_bh->b_size, GFP_NOFS);
1104 memcpy(alloc_copy, alloc, osb->local_alloc_bh->b_size);
1106 status = ocfs2_journal_access(handle, local_alloc_inode,
1107 osb->local_alloc_bh,
1108 OCFS2_JOURNAL_ACCESS_WRITE);
1114 ocfs2_clear_local_alloc(alloc);
1116 status = ocfs2_journal_dirty(handle, osb->local_alloc_bh);
1122 status = ocfs2_sync_local_to_main(osb, handle, alloc_copy,
1123 main_bm_inode, main_bm_bh);
1129 status = ocfs2_local_alloc_new_window(osb, handle, ac);
1131 if (status != -ENOSPC)
1136 atomic_inc(&osb->alloc_stats.moves);
1141 ocfs2_commit_trans(osb, handle);
1147 iput(main_bm_inode);
1153 ocfs2_free_alloc_context(ac);