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,
56 struct ocfs2_alloc_reservation *resv);
58 static void ocfs2_clear_local_alloc(struct ocfs2_dinode *alloc);
60 static int ocfs2_sync_local_to_main(struct ocfs2_super *osb,
62 struct ocfs2_dinode *alloc,
63 struct inode *main_bm_inode,
64 struct buffer_head *main_bm_bh);
66 static int ocfs2_local_alloc_reserve_for_window(struct ocfs2_super *osb,
67 struct ocfs2_alloc_context **ac,
68 struct inode **bitmap_inode,
69 struct buffer_head **bitmap_bh);
71 static int ocfs2_local_alloc_new_window(struct ocfs2_super *osb,
73 struct ocfs2_alloc_context *ac);
75 static int ocfs2_local_alloc_slide_window(struct ocfs2_super *osb,
76 struct inode *local_alloc_inode);
78 static inline int ocfs2_la_state_enabled(struct ocfs2_super *osb)
80 return (osb->local_alloc_state == OCFS2_LA_THROTTLED ||
81 osb->local_alloc_state == OCFS2_LA_ENABLED);
84 void ocfs2_local_alloc_seen_free_bits(struct ocfs2_super *osb,
85 unsigned int num_clusters)
87 spin_lock(&osb->osb_lock);
88 if (osb->local_alloc_state == OCFS2_LA_DISABLED ||
89 osb->local_alloc_state == OCFS2_LA_THROTTLED)
90 if (num_clusters >= osb->local_alloc_default_bits) {
91 cancel_delayed_work(&osb->la_enable_wq);
92 osb->local_alloc_state = OCFS2_LA_ENABLED;
94 spin_unlock(&osb->osb_lock);
97 void ocfs2_la_enable_worker(struct work_struct *work)
99 struct ocfs2_super *osb =
100 container_of(work, struct ocfs2_super,
102 spin_lock(&osb->osb_lock);
103 osb->local_alloc_state = OCFS2_LA_ENABLED;
104 spin_unlock(&osb->osb_lock);
108 * Tell us whether a given allocation should use the local alloc
109 * file. Otherwise, it has to go to the main bitmap.
111 * This function does semi-dirty reads of local alloc size and state!
112 * This is ok however, as the values are re-checked once under mutex.
114 int ocfs2_alloc_should_use_local(struct ocfs2_super *osb, u64 bits)
119 spin_lock(&osb->osb_lock);
120 la_bits = osb->local_alloc_bits;
122 if (!ocfs2_la_state_enabled(osb))
125 /* la_bits should be at least twice the size (in clusters) of
126 * a new block group. We want to be sure block group
127 * allocations go through the local alloc, so allow an
128 * allocation to take up to half the bitmap. */
129 if (bits > (la_bits / 2))
134 mlog(0, "state=%d, bits=%llu, la_bits=%d, ret=%d\n",
135 osb->local_alloc_state, (unsigned long long)bits, la_bits, ret);
136 spin_unlock(&osb->osb_lock);
140 int ocfs2_load_local_alloc(struct ocfs2_super *osb)
143 struct ocfs2_dinode *alloc = NULL;
144 struct buffer_head *alloc_bh = NULL;
146 struct inode *inode = NULL;
147 struct ocfs2_local_alloc *la;
151 if (osb->local_alloc_bits == 0)
154 if (osb->local_alloc_bits >= osb->bitmap_cpg) {
155 mlog(ML_NOTICE, "Requested local alloc window %d is larger "
156 "than max possible %u. Using defaults.\n",
157 osb->local_alloc_bits, (osb->bitmap_cpg - 1));
158 osb->local_alloc_bits =
159 ocfs2_megabytes_to_clusters(osb->sb,
160 OCFS2_DEFAULT_LOCAL_ALLOC_SIZE);
163 /* read the alloc off disk */
164 inode = ocfs2_get_system_file_inode(osb, LOCAL_ALLOC_SYSTEM_INODE,
172 status = ocfs2_read_inode_block_full(inode, &alloc_bh,
173 OCFS2_BH_IGNORE_CACHE);
179 alloc = (struct ocfs2_dinode *) alloc_bh->b_data;
180 la = OCFS2_LOCAL_ALLOC(alloc);
182 if (!(le32_to_cpu(alloc->i_flags) &
183 (OCFS2_LOCAL_ALLOC_FL|OCFS2_BITMAP_FL))) {
184 mlog(ML_ERROR, "Invalid local alloc inode, %llu\n",
185 (unsigned long long)OCFS2_I(inode)->ip_blkno);
190 if ((la->la_size == 0) ||
191 (le16_to_cpu(la->la_size) > ocfs2_local_alloc_size(inode->i_sb))) {
192 mlog(ML_ERROR, "Local alloc size is invalid (la_size = %u)\n",
193 le16_to_cpu(la->la_size));
198 /* do a little verification. */
199 num_used = ocfs2_local_alloc_count_bits(alloc);
201 /* hopefully the local alloc has always been recovered before
204 || alloc->id1.bitmap1.i_used
205 || alloc->id1.bitmap1.i_total
207 mlog(ML_ERROR, "Local alloc hasn't been recovered!\n"
208 "found = %u, set = %u, taken = %u, off = %u\n",
209 num_used, le32_to_cpu(alloc->id1.bitmap1.i_used),
210 le32_to_cpu(alloc->id1.bitmap1.i_total),
211 OCFS2_LOCAL_ALLOC(alloc)->la_bm_off);
213 osb->local_alloc_bh = alloc_bh;
214 osb->local_alloc_state = OCFS2_LA_ENABLED;
222 mlog(0, "Local alloc window bits = %d\n", osb->local_alloc_bits);
229 * return any unused bits to the bitmap and write out a clean
232 * local_alloc_bh is optional. If not passed, we will simply use the
233 * one off osb. If you do pass it however, be warned that it *will* be
234 * returned brelse'd and NULL'd out.*/
235 void ocfs2_shutdown_local_alloc(struct ocfs2_super *osb)
239 struct inode *local_alloc_inode = NULL;
240 struct buffer_head *bh = NULL;
241 struct buffer_head *main_bm_bh = NULL;
242 struct inode *main_bm_inode = NULL;
243 struct ocfs2_dinode *alloc_copy = NULL;
244 struct ocfs2_dinode *alloc = NULL;
248 cancel_delayed_work(&osb->la_enable_wq);
249 flush_workqueue(ocfs2_wq);
251 if (osb->local_alloc_state == OCFS2_LA_UNUSED)
255 ocfs2_get_system_file_inode(osb,
256 LOCAL_ALLOC_SYSTEM_INODE,
258 if (!local_alloc_inode) {
264 osb->local_alloc_state = OCFS2_LA_DISABLED;
266 ocfs2_resmap_uninit(&osb->osb_la_resmap);
268 main_bm_inode = ocfs2_get_system_file_inode(osb,
269 GLOBAL_BITMAP_SYSTEM_INODE,
271 if (!main_bm_inode) {
277 mutex_lock(&main_bm_inode->i_mutex);
279 status = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
285 /* WINDOW_MOVE_CREDITS is a bit heavy... */
286 handle = ocfs2_start_trans(osb, OCFS2_WINDOW_MOVE_CREDITS);
287 if (IS_ERR(handle)) {
288 mlog_errno(PTR_ERR(handle));
293 bh = osb->local_alloc_bh;
294 alloc = (struct ocfs2_dinode *) bh->b_data;
296 alloc_copy = kmalloc(bh->b_size, GFP_NOFS);
301 memcpy(alloc_copy, alloc, bh->b_size);
303 status = ocfs2_journal_access_di(handle, INODE_CACHE(local_alloc_inode),
304 bh, OCFS2_JOURNAL_ACCESS_WRITE);
310 ocfs2_clear_local_alloc(alloc);
311 ocfs2_journal_dirty(handle, bh);
314 osb->local_alloc_bh = NULL;
315 osb->local_alloc_state = OCFS2_LA_UNUSED;
317 status = ocfs2_sync_local_to_main(osb, handle, alloc_copy,
318 main_bm_inode, main_bm_bh);
323 ocfs2_commit_trans(osb, handle);
328 ocfs2_inode_unlock(main_bm_inode, 1);
331 mutex_unlock(&main_bm_inode->i_mutex);
335 if (local_alloc_inode)
336 iput(local_alloc_inode);
345 * We want to free the bitmap bits outside of any recovery context as
346 * we'll need a cluster lock to do so, but we must clear the local
347 * alloc before giving up the recovered nodes journal. To solve this,
348 * we kmalloc a copy of the local alloc before it's change for the
349 * caller to process with ocfs2_complete_local_alloc_recovery
351 int ocfs2_begin_local_alloc_recovery(struct ocfs2_super *osb,
353 struct ocfs2_dinode **alloc_copy)
356 struct buffer_head *alloc_bh = NULL;
357 struct inode *inode = NULL;
358 struct ocfs2_dinode *alloc;
360 mlog_entry("(slot_num = %d)\n", slot_num);
364 inode = ocfs2_get_system_file_inode(osb,
365 LOCAL_ALLOC_SYSTEM_INODE,
373 mutex_lock(&inode->i_mutex);
375 status = ocfs2_read_inode_block_full(inode, &alloc_bh,
376 OCFS2_BH_IGNORE_CACHE);
382 *alloc_copy = kmalloc(alloc_bh->b_size, GFP_KERNEL);
383 if (!(*alloc_copy)) {
387 memcpy((*alloc_copy), alloc_bh->b_data, alloc_bh->b_size);
389 alloc = (struct ocfs2_dinode *) alloc_bh->b_data;
390 ocfs2_clear_local_alloc(alloc);
392 ocfs2_compute_meta_ecc(osb->sb, alloc_bh->b_data, &alloc->i_check);
393 status = ocfs2_write_block(osb, alloc_bh, INODE_CACHE(inode));
398 if ((status < 0) && (*alloc_copy)) {
406 mutex_unlock(&inode->i_mutex);
415 * Step 2: By now, we've completed the journal recovery, we've stamped
416 * a clean local alloc on disk and dropped the node out of the
417 * recovery map. Dlm locks will no longer stall, so lets clear out the
420 int ocfs2_complete_local_alloc_recovery(struct ocfs2_super *osb,
421 struct ocfs2_dinode *alloc)
425 struct buffer_head *main_bm_bh = NULL;
426 struct inode *main_bm_inode;
430 main_bm_inode = ocfs2_get_system_file_inode(osb,
431 GLOBAL_BITMAP_SYSTEM_INODE,
433 if (!main_bm_inode) {
439 mutex_lock(&main_bm_inode->i_mutex);
441 status = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
447 handle = ocfs2_start_trans(osb, OCFS2_WINDOW_MOVE_CREDITS);
448 if (IS_ERR(handle)) {
449 status = PTR_ERR(handle);
455 /* we want the bitmap change to be recorded on disk asap */
458 status = ocfs2_sync_local_to_main(osb, handle, alloc,
459 main_bm_inode, main_bm_bh);
463 ocfs2_commit_trans(osb, handle);
466 ocfs2_inode_unlock(main_bm_inode, 1);
469 mutex_unlock(&main_bm_inode->i_mutex);
477 ocfs2_init_steal_slots(osb);
483 * make sure we've got at least bits_wanted contiguous bits in the
484 * local alloc. You lose them when you drop i_mutex.
486 * We will add ourselves to the transaction passed in, but may start
487 * our own in order to shift windows.
489 int ocfs2_reserve_local_alloc_bits(struct ocfs2_super *osb,
491 struct ocfs2_alloc_context *ac)
494 struct ocfs2_dinode *alloc;
495 struct inode *local_alloc_inode;
496 unsigned int free_bits;
503 ocfs2_get_system_file_inode(osb,
504 LOCAL_ALLOC_SYSTEM_INODE,
506 if (!local_alloc_inode) {
512 mutex_lock(&local_alloc_inode->i_mutex);
515 * We must double check state and allocator bits because
516 * another process may have changed them while holding i_mutex.
518 spin_lock(&osb->osb_lock);
519 if (!ocfs2_la_state_enabled(osb) ||
520 (bits_wanted > osb->local_alloc_bits)) {
521 spin_unlock(&osb->osb_lock);
525 spin_unlock(&osb->osb_lock);
527 alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
529 #ifdef CONFIG_OCFS2_DEBUG_FS
530 if (le32_to_cpu(alloc->id1.bitmap1.i_used) !=
531 ocfs2_local_alloc_count_bits(alloc)) {
532 ocfs2_error(osb->sb, "local alloc inode %llu says it has "
533 "%u free bits, but a count shows %u",
534 (unsigned long long)le64_to_cpu(alloc->i_blkno),
535 le32_to_cpu(alloc->id1.bitmap1.i_used),
536 ocfs2_local_alloc_count_bits(alloc));
542 free_bits = le32_to_cpu(alloc->id1.bitmap1.i_total) -
543 le32_to_cpu(alloc->id1.bitmap1.i_used);
544 if (bits_wanted > free_bits) {
545 /* uhoh, window change time. */
547 ocfs2_local_alloc_slide_window(osb, local_alloc_inode);
549 if (status != -ENOSPC)
555 * Under certain conditions, the window slide code
556 * might have reduced the number of bits available or
557 * disabled the the local alloc entirely. Re-check
558 * here and return -ENOSPC if necessary.
561 if (!ocfs2_la_state_enabled(osb))
564 free_bits = le32_to_cpu(alloc->id1.bitmap1.i_total) -
565 le32_to_cpu(alloc->id1.bitmap1.i_used);
566 if (bits_wanted > free_bits)
570 if (ac->ac_max_block)
571 mlog(0, "Calling in_range for max block %llu\n",
572 (unsigned long long)ac->ac_max_block);
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,
617 /* TODO: Shouldn't we just BUG here? */
623 bitmap = la->la_bitmap;
624 *bit_off = le32_to_cpu(la->la_bm_off) + start;
625 *num_bits = bits_wanted;
627 status = ocfs2_journal_access_di(handle,
628 INODE_CACHE(local_alloc_inode),
630 OCFS2_JOURNAL_ACCESS_WRITE);
636 ocfs2_resmap_claimed_bits(&osb->osb_la_resmap, ac->ac_resv, start,
640 ocfs2_set_bit(start++, bitmap);
642 le32_add_cpu(&alloc->id1.bitmap1.i_used, *num_bits);
643 ocfs2_journal_dirty(handle, osb->local_alloc_bh);
650 static u32 ocfs2_local_alloc_count_bits(struct ocfs2_dinode *alloc)
655 struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc);
659 buffer = la->la_bitmap;
660 for (i = 0; i < le16_to_cpu(la->la_size); i++)
661 count += hweight8(buffer[i]);
667 static int ocfs2_local_alloc_find_clear_bits(struct ocfs2_super *osb,
668 struct ocfs2_dinode *alloc,
670 struct ocfs2_alloc_reservation *resv)
672 int numfound, bitoff, left, startoff, lastzero;
674 struct ocfs2_alloc_reservation r;
676 struct ocfs2_reservation_map *resmap = &osb->osb_la_resmap;
678 mlog_entry("(numbits wanted = %u)\n", *numbits);
680 if (!alloc->id1.bitmap1.i_total) {
681 mlog(0, "No bits in my window!\n");
688 ocfs2_resv_init_once(&r);
689 ocfs2_resv_set_type(&r, OCFS2_RESV_FLAG_TMP);
694 if (ocfs2_resmap_resv_bits(resmap, resv, &bitoff, &numfound) == 0) {
695 if (numfound < *numbits)
701 * Code error. While reservations are enabled, local
702 * allocation should _always_ go through them.
704 BUG_ON(osb->osb_resv_level != 0);
707 * Reservations are disabled. Handle this the old way.
710 bitmap = OCFS2_LOCAL_ALLOC(alloc)->la_bitmap;
712 numfound = bitoff = startoff = 0;
714 left = le32_to_cpu(alloc->id1.bitmap1.i_total);
715 while ((bitoff = ocfs2_find_next_zero_bit(bitmap, left, startoff)) != -1) {
716 if (bitoff == left) {
717 /* mlog(0, "bitoff (%d) == left", bitoff); */
720 /* mlog(0, "Found a zero: bitoff = %d, startoff = %d, "
721 "numfound = %d\n", bitoff, startoff, numfound);*/
723 /* Ok, we found a zero bit... is it contig. or do we
725 if (bitoff == startoff) {
726 /* we found a zero */
730 /* got a zero after some ones */
734 /* we got everything we needed */
735 if (numfound == *numbits) {
736 /* mlog(0, "Found it all!\n"); */
741 mlog(0, "Exiting loop, bitoff = %d, numfound = %d\n", bitoff,
744 if (numfound == *numbits) {
745 bitoff = startoff - numfound;
754 ocfs2_resv_discard(resmap, resv);
760 static void ocfs2_clear_local_alloc(struct ocfs2_dinode *alloc)
762 struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc);
766 alloc->id1.bitmap1.i_total = 0;
767 alloc->id1.bitmap1.i_used = 0;
769 for(i = 0; i < le16_to_cpu(la->la_size); i++)
770 la->la_bitmap[i] = 0;
776 /* turn this on and uncomment below to aid debugging window shifts. */
777 static void ocfs2_verify_zero_bits(unsigned long *bitmap,
781 unsigned int tmp = count;
783 if (ocfs2_test_bit(start + tmp, bitmap)) {
784 printk("ocfs2_verify_zero_bits: start = %u, count = "
785 "%u\n", start, count);
786 printk("ocfs2_verify_zero_bits: bit %u is set!",
795 * sync the local alloc to main bitmap.
797 * assumes you've already locked the main bitmap -- the bitmap inode
798 * passed is used for caching.
800 static int ocfs2_sync_local_to_main(struct ocfs2_super *osb,
802 struct ocfs2_dinode *alloc,
803 struct inode *main_bm_inode,
804 struct buffer_head *main_bm_bh)
807 int bit_off, left, count, start;
811 struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc);
813 mlog_entry("total = %u, used = %u\n",
814 le32_to_cpu(alloc->id1.bitmap1.i_total),
815 le32_to_cpu(alloc->id1.bitmap1.i_used));
817 if (!alloc->id1.bitmap1.i_total) {
818 mlog(0, "nothing to sync!\n");
822 if (le32_to_cpu(alloc->id1.bitmap1.i_used) ==
823 le32_to_cpu(alloc->id1.bitmap1.i_total)) {
824 mlog(0, "all bits were taken!\n");
828 la_start_blk = ocfs2_clusters_to_blocks(osb->sb,
829 le32_to_cpu(la->la_bm_off));
830 bitmap = la->la_bitmap;
831 start = count = bit_off = 0;
832 left = le32_to_cpu(alloc->id1.bitmap1.i_total);
834 while ((bit_off = ocfs2_find_next_zero_bit(bitmap, left, start))
836 if ((bit_off < left) && (bit_off == start)) {
842 blkno = la_start_blk +
843 ocfs2_clusters_to_blocks(osb->sb,
846 mlog(0, "freeing %u bits starting at local alloc bit "
847 "%u (la_start_blk = %llu, blkno = %llu)\n",
848 count, start - count,
849 (unsigned long long)la_start_blk,
850 (unsigned long long)blkno);
852 status = ocfs2_release_clusters(handle,
872 enum ocfs2_la_event {
873 OCFS2_LA_EVENT_SLIDE, /* Normal window slide. */
874 OCFS2_LA_EVENT_FRAGMENTED, /* The global bitmap has
875 * enough bits theoretically
876 * free, but a contiguous
877 * allocation could not be
879 OCFS2_LA_EVENT_ENOSPC, /* Global bitmap doesn't have
880 * enough bits free to satisfy
883 #define OCFS2_LA_ENABLE_INTERVAL (30 * HZ)
885 * Given an event, calculate the size of our next local alloc window.
887 * This should always be called under i_mutex of the local alloc inode
888 * so that local alloc disabling doesn't race with processes trying to
891 * Returns the state which the local alloc was left in. This value can
892 * be ignored by some paths.
894 static int ocfs2_recalc_la_window(struct ocfs2_super *osb,
895 enum ocfs2_la_event event)
900 spin_lock(&osb->osb_lock);
901 if (osb->local_alloc_state == OCFS2_LA_DISABLED) {
902 WARN_ON_ONCE(osb->local_alloc_state == OCFS2_LA_DISABLED);
907 * ENOSPC and fragmentation are treated similarly for now.
909 if (event == OCFS2_LA_EVENT_ENOSPC ||
910 event == OCFS2_LA_EVENT_FRAGMENTED) {
912 * We ran out of contiguous space in the primary
913 * bitmap. Drastically reduce the number of bits used
914 * by local alloc until we have to disable it.
916 bits = osb->local_alloc_bits >> 1;
917 if (bits > ocfs2_megabytes_to_clusters(osb->sb, 1)) {
919 * By setting state to THROTTLED, we'll keep
920 * the number of local alloc bits used down
921 * until an event occurs which would give us
922 * reason to assume the bitmap situation might
925 osb->local_alloc_state = OCFS2_LA_THROTTLED;
926 osb->local_alloc_bits = bits;
928 osb->local_alloc_state = OCFS2_LA_DISABLED;
930 queue_delayed_work(ocfs2_wq, &osb->la_enable_wq,
931 OCFS2_LA_ENABLE_INTERVAL);
936 * Don't increase the size of the local alloc window until we
937 * know we might be able to fulfill the request. Otherwise, we
938 * risk bouncing around the global bitmap during periods of
941 if (osb->local_alloc_state != OCFS2_LA_THROTTLED)
942 osb->local_alloc_bits = osb->local_alloc_default_bits;
945 state = osb->local_alloc_state;
946 spin_unlock(&osb->osb_lock);
951 static int ocfs2_local_alloc_reserve_for_window(struct ocfs2_super *osb,
952 struct ocfs2_alloc_context **ac,
953 struct inode **bitmap_inode,
954 struct buffer_head **bitmap_bh)
958 *ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
966 (*ac)->ac_bits_wanted = osb->local_alloc_default_bits;
967 status = ocfs2_reserve_cluster_bitmap_bits(osb, *ac);
968 if (status == -ENOSPC) {
969 if (ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_ENOSPC) ==
973 ocfs2_free_ac_resource(*ac);
974 memset(*ac, 0, sizeof(struct ocfs2_alloc_context));
982 *bitmap_inode = (*ac)->ac_inode;
983 igrab(*bitmap_inode);
984 *bitmap_bh = (*ac)->ac_bh;
988 if ((status < 0) && *ac) {
989 ocfs2_free_alloc_context(*ac);
998 * pass it the bitmap lock in lock_bh if you have it.
1000 static int ocfs2_local_alloc_new_window(struct ocfs2_super *osb,
1002 struct ocfs2_alloc_context *ac)
1005 u32 cluster_off, cluster_count;
1006 struct ocfs2_dinode *alloc = NULL;
1007 struct ocfs2_local_alloc *la;
1011 alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
1012 la = OCFS2_LOCAL_ALLOC(alloc);
1014 if (alloc->id1.bitmap1.i_total)
1015 mlog(0, "asking me to alloc a new window over a non-empty "
1018 mlog(0, "Allocating %u clusters for a new window.\n",
1019 osb->local_alloc_bits);
1021 /* Instruct the allocation code to try the most recently used
1022 * cluster group. We'll re-record the group used this pass
1024 ac->ac_last_group = osb->la_last_gd;
1026 /* we used the generic suballoc reserve function, but we set
1027 * everything up nicely, so there's no reason why we can't use
1028 * the more specific cluster api to claim bits. */
1029 status = ocfs2_claim_clusters(osb, handle, ac, osb->local_alloc_bits,
1030 &cluster_off, &cluster_count);
1031 if (status == -ENOSPC) {
1034 * Note: We could also try syncing the journal here to
1035 * allow use of any free bits which the current
1036 * transaction can't give us access to. --Mark
1038 if (ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_FRAGMENTED) ==
1042 ac->ac_bits_wanted = osb->local_alloc_default_bits;
1043 status = ocfs2_claim_clusters(osb, handle, ac,
1044 osb->local_alloc_bits,
1047 if (status == -ENOSPC)
1050 * We only shrunk the *minimum* number of in our
1051 * request - it's entirely possible that the allocator
1052 * might give us more than we asked for.
1055 spin_lock(&osb->osb_lock);
1056 osb->local_alloc_bits = cluster_count;
1057 spin_unlock(&osb->osb_lock);
1061 if (status != -ENOSPC)
1066 osb->la_last_gd = ac->ac_last_group;
1068 la->la_bm_off = cpu_to_le32(cluster_off);
1069 alloc->id1.bitmap1.i_total = cpu_to_le32(cluster_count);
1070 /* just in case... In the future when we find space ourselves,
1071 * we don't have to get all contiguous -- but we'll have to
1072 * set all previously used bits in bitmap and update
1073 * la_bits_set before setting the bits in the main bitmap. */
1074 alloc->id1.bitmap1.i_used = 0;
1075 memset(OCFS2_LOCAL_ALLOC(alloc)->la_bitmap, 0,
1076 le16_to_cpu(la->la_size));
1078 ocfs2_resmap_restart(&osb->osb_la_resmap, cluster_count,
1079 OCFS2_LOCAL_ALLOC(alloc)->la_bitmap);
1081 mlog(0, "New window allocated:\n");
1082 mlog(0, "window la_bm_off = %u\n",
1083 OCFS2_LOCAL_ALLOC(alloc)->la_bm_off);
1084 mlog(0, "window bits = %u\n", le32_to_cpu(alloc->id1.bitmap1.i_total));
1091 /* Note that we do *NOT* lock the local alloc inode here as
1092 * it's been locked already for us. */
1093 static int ocfs2_local_alloc_slide_window(struct ocfs2_super *osb,
1094 struct inode *local_alloc_inode)
1097 struct buffer_head *main_bm_bh = NULL;
1098 struct inode *main_bm_inode = NULL;
1099 handle_t *handle = NULL;
1100 struct ocfs2_dinode *alloc;
1101 struct ocfs2_dinode *alloc_copy = NULL;
1102 struct ocfs2_alloc_context *ac = NULL;
1106 ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_SLIDE);
1108 /* This will lock the main bitmap for us. */
1109 status = ocfs2_local_alloc_reserve_for_window(osb,
1114 if (status != -ENOSPC)
1119 handle = ocfs2_start_trans(osb, OCFS2_WINDOW_MOVE_CREDITS);
1120 if (IS_ERR(handle)) {
1121 status = PTR_ERR(handle);
1127 alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
1129 /* We want to clear the local alloc before doing anything
1130 * else, so that if we error later during this operation,
1131 * local alloc shutdown won't try to double free main bitmap
1132 * bits. Make a copy so the sync function knows which bits to
1134 alloc_copy = kmalloc(osb->local_alloc_bh->b_size, GFP_NOFS);
1140 memcpy(alloc_copy, alloc, osb->local_alloc_bh->b_size);
1142 status = ocfs2_journal_access_di(handle,
1143 INODE_CACHE(local_alloc_inode),
1144 osb->local_alloc_bh,
1145 OCFS2_JOURNAL_ACCESS_WRITE);
1151 ocfs2_clear_local_alloc(alloc);
1152 ocfs2_journal_dirty(handle, osb->local_alloc_bh);
1154 status = ocfs2_sync_local_to_main(osb, handle, alloc_copy,
1155 main_bm_inode, main_bm_bh);
1161 status = ocfs2_local_alloc_new_window(osb, handle, ac);
1163 if (status != -ENOSPC)
1168 atomic_inc(&osb->alloc_stats.moves);
1172 ocfs2_commit_trans(osb, handle);
1177 iput(main_bm_inode);
1183 ocfs2_free_alloc_context(ac);