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>
38 #include "blockcheck.h"
42 #include "localalloc.h"
47 #include "buffer_head_io.h"
49 #define OCFS2_LOCAL_ALLOC(dinode) (&((dinode)->id2.i_lab))
51 static u32 ocfs2_local_alloc_count_bits(struct ocfs2_dinode *alloc);
53 static int ocfs2_local_alloc_find_clear_bits(struct ocfs2_super *osb,
54 struct ocfs2_dinode *alloc,
57 static void ocfs2_clear_local_alloc(struct ocfs2_dinode *alloc);
59 static int ocfs2_sync_local_to_main(struct ocfs2_super *osb,
61 struct ocfs2_dinode *alloc,
62 struct inode *main_bm_inode,
63 struct buffer_head *main_bm_bh);
65 static int ocfs2_local_alloc_reserve_for_window(struct ocfs2_super *osb,
66 struct ocfs2_alloc_context **ac,
67 struct inode **bitmap_inode,
68 struct buffer_head **bitmap_bh);
70 static int ocfs2_local_alloc_new_window(struct ocfs2_super *osb,
72 struct ocfs2_alloc_context *ac);
74 static int ocfs2_local_alloc_slide_window(struct ocfs2_super *osb,
75 struct inode *local_alloc_inode);
77 static inline int ocfs2_la_state_enabled(struct ocfs2_super *osb)
79 return (osb->local_alloc_state == OCFS2_LA_THROTTLED ||
80 osb->local_alloc_state == OCFS2_LA_ENABLED);
83 void ocfs2_local_alloc_seen_free_bits(struct ocfs2_super *osb,
84 unsigned int num_clusters)
86 spin_lock(&osb->osb_lock);
87 if (osb->local_alloc_state == OCFS2_LA_DISABLED ||
88 osb->local_alloc_state == OCFS2_LA_THROTTLED)
89 if (num_clusters >= osb->local_alloc_default_bits) {
90 cancel_delayed_work(&osb->la_enable_wq);
91 osb->local_alloc_state = OCFS2_LA_ENABLED;
93 spin_unlock(&osb->osb_lock);
96 void ocfs2_la_enable_worker(struct work_struct *work)
98 struct ocfs2_super *osb =
99 container_of(work, struct ocfs2_super,
101 spin_lock(&osb->osb_lock);
102 osb->local_alloc_state = OCFS2_LA_ENABLED;
103 spin_unlock(&osb->osb_lock);
107 * Tell us whether a given allocation should use the local alloc
108 * file. Otherwise, it has to go to the main bitmap.
110 * This function does semi-dirty reads of local alloc size and state!
111 * This is ok however, as the values are re-checked once under mutex.
113 int ocfs2_alloc_should_use_local(struct ocfs2_super *osb, u64 bits)
118 spin_lock(&osb->osb_lock);
119 la_bits = osb->local_alloc_bits;
121 if (!ocfs2_la_state_enabled(osb))
124 /* la_bits should be at least twice the size (in clusters) of
125 * a new block group. We want to be sure block group
126 * allocations go through the local alloc, so allow an
127 * allocation to take up to half the bitmap. */
128 if (bits > (la_bits / 2))
133 mlog(0, "state=%d, bits=%llu, la_bits=%d, ret=%d\n",
134 osb->local_alloc_state, (unsigned long long)bits, la_bits, ret);
135 spin_unlock(&osb->osb_lock);
139 int ocfs2_load_local_alloc(struct ocfs2_super *osb)
142 struct ocfs2_dinode *alloc = NULL;
143 struct buffer_head *alloc_bh = NULL;
145 struct inode *inode = NULL;
146 struct ocfs2_local_alloc *la;
150 if (osb->local_alloc_bits == 0)
153 if (osb->local_alloc_bits >= osb->bitmap_cpg) {
154 mlog(ML_NOTICE, "Requested local alloc window %d is larger "
155 "than max possible %u. Using defaults.\n",
156 osb->local_alloc_bits, (osb->bitmap_cpg - 1));
157 osb->local_alloc_bits =
158 ocfs2_megabytes_to_clusters(osb->sb,
159 OCFS2_DEFAULT_LOCAL_ALLOC_SIZE);
162 /* read the alloc off disk */
163 inode = ocfs2_get_system_file_inode(osb, LOCAL_ALLOC_SYSTEM_INODE,
171 status = ocfs2_read_inode_block_full(inode, &alloc_bh,
172 OCFS2_BH_IGNORE_CACHE);
178 alloc = (struct ocfs2_dinode *) alloc_bh->b_data;
179 la = OCFS2_LOCAL_ALLOC(alloc);
181 if (!(le32_to_cpu(alloc->i_flags) &
182 (OCFS2_LOCAL_ALLOC_FL|OCFS2_BITMAP_FL))) {
183 mlog(ML_ERROR, "Invalid local alloc inode, %llu\n",
184 (unsigned long long)OCFS2_I(inode)->ip_blkno);
189 if ((la->la_size == 0) ||
190 (le16_to_cpu(la->la_size) > ocfs2_local_alloc_size(inode->i_sb))) {
191 mlog(ML_ERROR, "Local alloc size is invalid (la_size = %u)\n",
192 le16_to_cpu(la->la_size));
197 /* do a little verification. */
198 num_used = ocfs2_local_alloc_count_bits(alloc);
200 /* hopefully the local alloc has always been recovered before
203 || alloc->id1.bitmap1.i_used
204 || alloc->id1.bitmap1.i_total
206 mlog(ML_ERROR, "Local alloc hasn't been recovered!\n"
207 "found = %u, set = %u, taken = %u, off = %u\n",
208 num_used, le32_to_cpu(alloc->id1.bitmap1.i_used),
209 le32_to_cpu(alloc->id1.bitmap1.i_total),
210 OCFS2_LOCAL_ALLOC(alloc)->la_bm_off);
212 osb->local_alloc_bh = alloc_bh;
213 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_di(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);
330 ocfs2_inode_unlock(main_bm_inode, 1);
333 mutex_unlock(&main_bm_inode->i_mutex);
337 if (local_alloc_inode)
338 iput(local_alloc_inode);
347 * We want to free the bitmap bits outside of any recovery context as
348 * we'll need a cluster lock to do so, but we must clear the local
349 * alloc before giving up the recovered nodes journal. To solve this,
350 * we kmalloc a copy of the local alloc before it's change for the
351 * caller to process with ocfs2_complete_local_alloc_recovery
353 int ocfs2_begin_local_alloc_recovery(struct ocfs2_super *osb,
355 struct ocfs2_dinode **alloc_copy)
358 struct buffer_head *alloc_bh = NULL;
359 struct inode *inode = NULL;
360 struct ocfs2_dinode *alloc;
362 mlog_entry("(slot_num = %d)\n", slot_num);
366 inode = ocfs2_get_system_file_inode(osb,
367 LOCAL_ALLOC_SYSTEM_INODE,
375 mutex_lock(&inode->i_mutex);
377 status = ocfs2_read_inode_block_full(inode, &alloc_bh,
378 OCFS2_BH_IGNORE_CACHE);
384 *alloc_copy = kmalloc(alloc_bh->b_size, GFP_KERNEL);
385 if (!(*alloc_copy)) {
389 memcpy((*alloc_copy), alloc_bh->b_data, alloc_bh->b_size);
391 alloc = (struct ocfs2_dinode *) alloc_bh->b_data;
392 ocfs2_clear_local_alloc(alloc);
394 ocfs2_compute_meta_ecc(osb->sb, alloc_bh->b_data, &alloc->i_check);
395 status = ocfs2_write_block(osb, alloc_bh, inode);
400 if ((status < 0) && (*alloc_copy)) {
408 mutex_unlock(&inode->i_mutex);
417 * Step 2: By now, we've completed the journal recovery, we've stamped
418 * a clean local alloc on disk and dropped the node out of the
419 * recovery map. Dlm locks will no longer stall, so lets clear out the
422 int ocfs2_complete_local_alloc_recovery(struct ocfs2_super *osb,
423 struct ocfs2_dinode *alloc)
427 struct buffer_head *main_bm_bh = NULL;
428 struct inode *main_bm_inode;
432 main_bm_inode = ocfs2_get_system_file_inode(osb,
433 GLOBAL_BITMAP_SYSTEM_INODE,
435 if (!main_bm_inode) {
441 mutex_lock(&main_bm_inode->i_mutex);
443 status = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
449 handle = ocfs2_start_trans(osb, OCFS2_WINDOW_MOVE_CREDITS);
450 if (IS_ERR(handle)) {
451 status = PTR_ERR(handle);
457 /* we want the bitmap change to be recorded on disk asap */
460 status = ocfs2_sync_local_to_main(osb, handle, alloc,
461 main_bm_inode, main_bm_bh);
465 ocfs2_commit_trans(osb, handle);
468 ocfs2_inode_unlock(main_bm_inode, 1);
471 mutex_unlock(&main_bm_inode->i_mutex);
479 ocfs2_init_inode_steal_slot(osb);
484 /* Check to see if the local alloc window is within ac->ac_max_block */
485 static int ocfs2_local_alloc_in_range(struct inode *inode,
486 struct ocfs2_alloc_context *ac,
489 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
490 struct ocfs2_dinode *alloc;
491 struct ocfs2_local_alloc *la;
495 if (!ac->ac_max_block)
498 alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
499 la = OCFS2_LOCAL_ALLOC(alloc);
501 start = ocfs2_local_alloc_find_clear_bits(osb, alloc, bits_wanted);
508 * Converting (bm_off + start + bits_wanted) to blocks gives us
509 * the blkno just past our actual allocation. This is perfect
510 * to compare with ac_max_block.
512 block_off = ocfs2_clusters_to_blocks(inode->i_sb,
513 le32_to_cpu(la->la_bm_off) +
514 start + bits_wanted);
515 mlog(0, "Checking %llu against %llu\n",
516 (unsigned long long)block_off,
517 (unsigned long long)ac->ac_max_block);
518 if (block_off > ac->ac_max_block)
525 * make sure we've got at least bits_wanted contiguous bits in the
526 * local alloc. You lose them when you drop i_mutex.
528 * We will add ourselves to the transaction passed in, but may start
529 * our own in order to shift windows.
531 int ocfs2_reserve_local_alloc_bits(struct ocfs2_super *osb,
533 struct ocfs2_alloc_context *ac)
536 struct ocfs2_dinode *alloc;
537 struct inode *local_alloc_inode;
538 unsigned int free_bits;
545 ocfs2_get_system_file_inode(osb,
546 LOCAL_ALLOC_SYSTEM_INODE,
548 if (!local_alloc_inode) {
554 mutex_lock(&local_alloc_inode->i_mutex);
557 * We must double check state and allocator bits because
558 * another process may have changed them while holding i_mutex.
560 spin_lock(&osb->osb_lock);
561 if (!ocfs2_la_state_enabled(osb) ||
562 (bits_wanted > osb->local_alloc_bits)) {
563 spin_unlock(&osb->osb_lock);
567 spin_unlock(&osb->osb_lock);
569 alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
571 #ifdef CONFIG_OCFS2_DEBUG_FS
572 if (le32_to_cpu(alloc->id1.bitmap1.i_used) !=
573 ocfs2_local_alloc_count_bits(alloc)) {
574 ocfs2_error(osb->sb, "local alloc inode %llu says it has "
575 "%u free bits, but a count shows %u",
576 (unsigned long long)le64_to_cpu(alloc->i_blkno),
577 le32_to_cpu(alloc->id1.bitmap1.i_used),
578 ocfs2_local_alloc_count_bits(alloc));
584 free_bits = le32_to_cpu(alloc->id1.bitmap1.i_total) -
585 le32_to_cpu(alloc->id1.bitmap1.i_used);
586 if (bits_wanted > free_bits) {
587 /* uhoh, window change time. */
589 ocfs2_local_alloc_slide_window(osb, local_alloc_inode);
591 if (status != -ENOSPC)
597 * Under certain conditions, the window slide code
598 * might have reduced the number of bits available or
599 * disabled the the local alloc entirely. Re-check
600 * here and return -ENOSPC if necessary.
603 if (!ocfs2_la_state_enabled(osb))
606 free_bits = le32_to_cpu(alloc->id1.bitmap1.i_total) -
607 le32_to_cpu(alloc->id1.bitmap1.i_used);
608 if (bits_wanted > free_bits)
612 if (ac->ac_max_block)
613 mlog(0, "Calling in_range for max block %llu\n",
614 (unsigned long long)ac->ac_max_block);
616 if (!ocfs2_local_alloc_in_range(local_alloc_inode, ac,
619 * The window is outside ac->ac_max_block.
620 * This errno tells the caller to keep localalloc enabled
621 * but to get the allocation from the main bitmap.
627 ac->ac_inode = local_alloc_inode;
628 /* We should never use localalloc from another slot */
629 ac->ac_alloc_slot = osb->slot_num;
630 ac->ac_which = OCFS2_AC_USE_LOCAL;
631 get_bh(osb->local_alloc_bh);
632 ac->ac_bh = osb->local_alloc_bh;
635 if (status < 0 && local_alloc_inode) {
636 mutex_unlock(&local_alloc_inode->i_mutex);
637 iput(local_alloc_inode);
640 mlog(0, "bits=%d, slot=%d, ret=%d\n", bits_wanted, osb->slot_num,
647 int ocfs2_claim_local_alloc_bits(struct ocfs2_super *osb,
649 struct ocfs2_alloc_context *ac,
655 struct inode *local_alloc_inode;
657 struct ocfs2_dinode *alloc;
658 struct ocfs2_local_alloc *la;
661 BUG_ON(ac->ac_which != OCFS2_AC_USE_LOCAL);
663 local_alloc_inode = ac->ac_inode;
664 alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
665 la = OCFS2_LOCAL_ALLOC(alloc);
667 start = ocfs2_local_alloc_find_clear_bits(osb, alloc, bits_wanted);
669 /* TODO: Shouldn't we just BUG here? */
675 bitmap = la->la_bitmap;
676 *bit_off = le32_to_cpu(la->la_bm_off) + start;
677 /* local alloc is always contiguous by nature -- we never
678 * delete bits from it! */
679 *num_bits = bits_wanted;
681 status = ocfs2_journal_access_di(handle, local_alloc_inode,
683 OCFS2_JOURNAL_ACCESS_WRITE);
690 ocfs2_set_bit(start++, bitmap);
692 le32_add_cpu(&alloc->id1.bitmap1.i_used, *num_bits);
694 status = ocfs2_journal_dirty(handle, osb->local_alloc_bh);
706 static u32 ocfs2_local_alloc_count_bits(struct ocfs2_dinode *alloc)
711 struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc);
715 buffer = la->la_bitmap;
716 for (i = 0; i < le16_to_cpu(la->la_size); i++)
717 count += hweight8(buffer[i]);
723 static int ocfs2_local_alloc_find_clear_bits(struct ocfs2_super *osb,
724 struct ocfs2_dinode *alloc,
727 int numfound, bitoff, left, startoff, lastzero;
730 mlog_entry("(numbits wanted = %u)\n", numbits);
732 if (!alloc->id1.bitmap1.i_total) {
733 mlog(0, "No bits in my window!\n");
738 bitmap = OCFS2_LOCAL_ALLOC(alloc)->la_bitmap;
740 numfound = bitoff = startoff = 0;
742 left = le32_to_cpu(alloc->id1.bitmap1.i_total);
743 while ((bitoff = ocfs2_find_next_zero_bit(bitmap, left, startoff)) != -1) {
744 if (bitoff == left) {
745 /* mlog(0, "bitoff (%d) == left", bitoff); */
748 /* mlog(0, "Found a zero: bitoff = %d, startoff = %d, "
749 "numfound = %d\n", bitoff, startoff, numfound);*/
751 /* Ok, we found a zero bit... is it contig. or do we
753 if (bitoff == startoff) {
754 /* we found a zero */
758 /* got a zero after some ones */
762 /* we got everything we needed */
763 if (numfound == numbits) {
764 /* mlog(0, "Found it all!\n"); */
769 mlog(0, "Exiting loop, bitoff = %d, numfound = %d\n", bitoff,
772 if (numfound == numbits)
773 bitoff = startoff - numfound;
782 static void ocfs2_clear_local_alloc(struct ocfs2_dinode *alloc)
784 struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc);
788 alloc->id1.bitmap1.i_total = 0;
789 alloc->id1.bitmap1.i_used = 0;
791 for(i = 0; i < le16_to_cpu(la->la_size); i++)
792 la->la_bitmap[i] = 0;
798 /* turn this on and uncomment below to aid debugging window shifts. */
799 static void ocfs2_verify_zero_bits(unsigned long *bitmap,
803 unsigned int tmp = count;
805 if (ocfs2_test_bit(start + tmp, bitmap)) {
806 printk("ocfs2_verify_zero_bits: start = %u, count = "
807 "%u\n", start, count);
808 printk("ocfs2_verify_zero_bits: bit %u is set!",
817 * sync the local alloc to main bitmap.
819 * assumes you've already locked the main bitmap -- the bitmap inode
820 * passed is used for caching.
822 static int ocfs2_sync_local_to_main(struct ocfs2_super *osb,
824 struct ocfs2_dinode *alloc,
825 struct inode *main_bm_inode,
826 struct buffer_head *main_bm_bh)
829 int bit_off, left, count, start;
833 struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc);
835 mlog_entry("total = %u, used = %u\n",
836 le32_to_cpu(alloc->id1.bitmap1.i_total),
837 le32_to_cpu(alloc->id1.bitmap1.i_used));
839 if (!alloc->id1.bitmap1.i_total) {
840 mlog(0, "nothing to sync!\n");
844 if (le32_to_cpu(alloc->id1.bitmap1.i_used) ==
845 le32_to_cpu(alloc->id1.bitmap1.i_total)) {
846 mlog(0, "all bits were taken!\n");
850 la_start_blk = ocfs2_clusters_to_blocks(osb->sb,
851 le32_to_cpu(la->la_bm_off));
852 bitmap = la->la_bitmap;
853 start = count = bit_off = 0;
854 left = le32_to_cpu(alloc->id1.bitmap1.i_total);
856 while ((bit_off = ocfs2_find_next_zero_bit(bitmap, left, start))
858 if ((bit_off < left) && (bit_off == start)) {
864 blkno = la_start_blk +
865 ocfs2_clusters_to_blocks(osb->sb,
868 mlog(0, "freeing %u bits starting at local alloc bit "
869 "%u (la_start_blk = %llu, blkno = %llu)\n",
870 count, start - count,
871 (unsigned long long)la_start_blk,
872 (unsigned long long)blkno);
874 status = ocfs2_free_clusters(handle, main_bm_inode,
875 main_bm_bh, blkno, count);
892 enum ocfs2_la_event {
893 OCFS2_LA_EVENT_SLIDE, /* Normal window slide. */
894 OCFS2_LA_EVENT_FRAGMENTED, /* The global bitmap has
895 * enough bits theoretically
896 * free, but a contiguous
897 * allocation could not be
899 OCFS2_LA_EVENT_ENOSPC, /* Global bitmap doesn't have
900 * enough bits free to satisfy
903 #define OCFS2_LA_ENABLE_INTERVAL (30 * HZ)
905 * Given an event, calculate the size of our next local alloc window.
907 * This should always be called under i_mutex of the local alloc inode
908 * so that local alloc disabling doesn't race with processes trying to
911 * Returns the state which the local alloc was left in. This value can
912 * be ignored by some paths.
914 static int ocfs2_recalc_la_window(struct ocfs2_super *osb,
915 enum ocfs2_la_event event)
920 spin_lock(&osb->osb_lock);
921 if (osb->local_alloc_state == OCFS2_LA_DISABLED) {
922 WARN_ON_ONCE(osb->local_alloc_state == OCFS2_LA_DISABLED);
927 * ENOSPC and fragmentation are treated similarly for now.
929 if (event == OCFS2_LA_EVENT_ENOSPC ||
930 event == OCFS2_LA_EVENT_FRAGMENTED) {
932 * We ran out of contiguous space in the primary
933 * bitmap. Drastically reduce the number of bits used
934 * by local alloc until we have to disable it.
936 bits = osb->local_alloc_bits >> 1;
937 if (bits > ocfs2_megabytes_to_clusters(osb->sb, 1)) {
939 * By setting state to THROTTLED, we'll keep
940 * the number of local alloc bits used down
941 * until an event occurs which would give us
942 * reason to assume the bitmap situation might
945 osb->local_alloc_state = OCFS2_LA_THROTTLED;
946 osb->local_alloc_bits = bits;
948 osb->local_alloc_state = OCFS2_LA_DISABLED;
950 queue_delayed_work(ocfs2_wq, &osb->la_enable_wq,
951 OCFS2_LA_ENABLE_INTERVAL);
956 * Don't increase the size of the local alloc window until we
957 * know we might be able to fulfill the request. Otherwise, we
958 * risk bouncing around the global bitmap during periods of
961 if (osb->local_alloc_state != OCFS2_LA_THROTTLED)
962 osb->local_alloc_bits = osb->local_alloc_default_bits;
965 state = osb->local_alloc_state;
966 spin_unlock(&osb->osb_lock);
971 static int ocfs2_local_alloc_reserve_for_window(struct ocfs2_super *osb,
972 struct ocfs2_alloc_context **ac,
973 struct inode **bitmap_inode,
974 struct buffer_head **bitmap_bh)
978 *ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
986 (*ac)->ac_bits_wanted = osb->local_alloc_bits;
988 status = ocfs2_reserve_cluster_bitmap_bits(osb, *ac);
989 if (status == -ENOSPC) {
990 if (ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_ENOSPC) ==
994 ocfs2_free_ac_resource(*ac);
995 memset(*ac, 0, sizeof(struct ocfs2_alloc_context));
1003 *bitmap_inode = (*ac)->ac_inode;
1004 igrab(*bitmap_inode);
1005 *bitmap_bh = (*ac)->ac_bh;
1009 if ((status < 0) && *ac) {
1010 ocfs2_free_alloc_context(*ac);
1019 * pass it the bitmap lock in lock_bh if you have it.
1021 static int ocfs2_local_alloc_new_window(struct ocfs2_super *osb,
1023 struct ocfs2_alloc_context *ac)
1026 u32 cluster_off, cluster_count;
1027 struct ocfs2_dinode *alloc = NULL;
1028 struct ocfs2_local_alloc *la;
1032 alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
1033 la = OCFS2_LOCAL_ALLOC(alloc);
1035 if (alloc->id1.bitmap1.i_total)
1036 mlog(0, "asking me to alloc a new window over a non-empty "
1039 mlog(0, "Allocating %u clusters for a new window.\n",
1040 osb->local_alloc_bits);
1042 /* Instruct the allocation code to try the most recently used
1043 * cluster group. We'll re-record the group used this pass
1045 ac->ac_last_group = osb->la_last_gd;
1047 /* we used the generic suballoc reserve function, but we set
1048 * everything up nicely, so there's no reason why we can't use
1049 * the more specific cluster api to claim bits. */
1050 status = ocfs2_claim_clusters(osb, handle, ac, osb->local_alloc_bits,
1051 &cluster_off, &cluster_count);
1052 if (status == -ENOSPC) {
1055 * Note: We could also try syncing the journal here to
1056 * allow use of any free bits which the current
1057 * transaction can't give us access to. --Mark
1059 if (ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_FRAGMENTED) ==
1063 status = ocfs2_claim_clusters(osb, handle, ac,
1064 osb->local_alloc_bits,
1067 if (status == -ENOSPC)
1070 * We only shrunk the *minimum* number of in our
1071 * request - it's entirely possible that the allocator
1072 * might give us more than we asked for.
1075 spin_lock(&osb->osb_lock);
1076 osb->local_alloc_bits = cluster_count;
1077 spin_unlock(&osb->osb_lock);
1081 if (status != -ENOSPC)
1086 osb->la_last_gd = ac->ac_last_group;
1088 la->la_bm_off = cpu_to_le32(cluster_off);
1089 alloc->id1.bitmap1.i_total = cpu_to_le32(cluster_count);
1090 /* just in case... In the future when we find space ourselves,
1091 * we don't have to get all contiguous -- but we'll have to
1092 * set all previously used bits in bitmap and update
1093 * la_bits_set before setting the bits in the main bitmap. */
1094 alloc->id1.bitmap1.i_used = 0;
1095 memset(OCFS2_LOCAL_ALLOC(alloc)->la_bitmap, 0,
1096 le16_to_cpu(la->la_size));
1098 mlog(0, "New window allocated:\n");
1099 mlog(0, "window la_bm_off = %u\n",
1100 OCFS2_LOCAL_ALLOC(alloc)->la_bm_off);
1101 mlog(0, "window bits = %u\n", le32_to_cpu(alloc->id1.bitmap1.i_total));
1108 /* Note that we do *NOT* lock the local alloc inode here as
1109 * it's been locked already for us. */
1110 static int ocfs2_local_alloc_slide_window(struct ocfs2_super *osb,
1111 struct inode *local_alloc_inode)
1114 struct buffer_head *main_bm_bh = NULL;
1115 struct inode *main_bm_inode = NULL;
1116 handle_t *handle = NULL;
1117 struct ocfs2_dinode *alloc;
1118 struct ocfs2_dinode *alloc_copy = NULL;
1119 struct ocfs2_alloc_context *ac = NULL;
1123 ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_SLIDE);
1125 /* This will lock the main bitmap for us. */
1126 status = ocfs2_local_alloc_reserve_for_window(osb,
1131 if (status != -ENOSPC)
1136 handle = ocfs2_start_trans(osb, OCFS2_WINDOW_MOVE_CREDITS);
1137 if (IS_ERR(handle)) {
1138 status = PTR_ERR(handle);
1144 alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
1146 /* We want to clear the local alloc before doing anything
1147 * else, so that if we error later during this operation,
1148 * local alloc shutdown won't try to double free main bitmap
1149 * bits. Make a copy so the sync function knows which bits to
1151 alloc_copy = kmalloc(osb->local_alloc_bh->b_size, GFP_NOFS);
1157 memcpy(alloc_copy, alloc, osb->local_alloc_bh->b_size);
1159 status = ocfs2_journal_access_di(handle, local_alloc_inode,
1160 osb->local_alloc_bh,
1161 OCFS2_JOURNAL_ACCESS_WRITE);
1167 ocfs2_clear_local_alloc(alloc);
1169 status = ocfs2_journal_dirty(handle, osb->local_alloc_bh);
1175 status = ocfs2_sync_local_to_main(osb, handle, alloc_copy,
1176 main_bm_inode, main_bm_bh);
1182 status = ocfs2_local_alloc_new_window(osb, handle, ac);
1184 if (status != -ENOSPC)
1189 atomic_inc(&osb->alloc_stats.moves);
1194 ocfs2_commit_trans(osb, handle);
1199 iput(main_bm_inode);
1205 ocfs2_free_alloc_context(ac);