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 #include <cluster/masklog.h>
37 #include "blockcheck.h"
41 #include "localalloc.h"
45 #include "ocfs2_trace.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
);
79 * ocfs2_la_default_mb() - determine a default size, in megabytes of
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
88 * Some things work against us when trying to choose a large local alloc:
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.
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.
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.
102 * The following reference table shows group descriptor and local
103 * alloc maximums at various cluster sizes (4k blocksize)
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
115 #define OCFS2_LA_MAX_DEFAULT_MB 256
116 #define OCFS2_LA_OLD_DEFAULT 8
117 unsigned int ocfs2_la_default_mb(struct ocfs2_super
*osb
)
121 unsigned int la_max_mb
;
122 unsigned int megs_per_slot
;
123 struct super_block
*sb
= osb
->sb
;
125 gd_mb
= ocfs2_clusters_to_megabytes(osb
->sb
,
126 8 * ocfs2_group_bitmap_size(sb
, 0, osb
->s_feature_incompat
));
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.
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
;
138 * Leave enough room for some block groups and make the final
139 * value we work from a multiple of 4.
147 * Keep window sizes down to a reasonable default
149 if (la_mb
> OCFS2_LA_MAX_DEFAULT_MB
) {
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.
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.
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.
168 if (gd_mb
> (2 * OCFS2_LA_MAX_DEFAULT_MB
))
171 unsigned int gd_mult
= gd_mb
;
173 while (gd_mult
> 256)
174 gd_mult
= gd_mult
>> 1;
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
;
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
)
195 void ocfs2_la_set_sizes(struct ocfs2_super
*osb
, int requested_mb
)
197 struct super_block
*sb
= osb
->sb
;
198 unsigned int la_default_mb
= ocfs2_la_default_mb(osb
);
199 unsigned int la_max_mb
;
201 la_max_mb
= ocfs2_clusters_to_megabytes(sb
,
202 ocfs2_local_alloc_size(sb
) * 8);
204 trace_ocfs2_la_set_sizes(requested_mb
, la_max_mb
, la_default_mb
);
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
);
215 osb
->local_alloc_default_bits
=
216 ocfs2_megabytes_to_clusters(sb
, requested_mb
);
219 osb
->local_alloc_bits
= osb
->local_alloc_default_bits
;
222 static inline int ocfs2_la_state_enabled(struct ocfs2_super
*osb
)
224 return (osb
->local_alloc_state
== OCFS2_LA_THROTTLED
||
225 osb
->local_alloc_state
== OCFS2_LA_ENABLED
);
228 void ocfs2_local_alloc_seen_free_bits(struct ocfs2_super
*osb
,
229 unsigned int num_clusters
)
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
;
238 spin_unlock(&osb
->osb_lock
);
241 void ocfs2_la_enable_worker(struct work_struct
*work
)
243 struct ocfs2_super
*osb
=
244 container_of(work
, struct ocfs2_super
,
246 spin_lock(&osb
->osb_lock
);
247 osb
->local_alloc_state
= OCFS2_LA_ENABLED
;
248 spin_unlock(&osb
->osb_lock
);
252 * Tell us whether a given allocation should use the local alloc
253 * file. Otherwise, it has to go to the main bitmap.
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.
258 int ocfs2_alloc_should_use_local(struct ocfs2_super
*osb
, u64 bits
)
263 spin_lock(&osb
->osb_lock
);
264 la_bits
= osb
->local_alloc_bits
;
266 if (!ocfs2_la_state_enabled(osb
))
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))
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
);
284 int ocfs2_load_local_alloc(struct ocfs2_super
*osb
)
287 struct ocfs2_dinode
*alloc
= NULL
;
288 struct buffer_head
*alloc_bh
= NULL
;
290 struct inode
*inode
= NULL
;
291 struct ocfs2_local_alloc
*la
;
293 if (osb
->local_alloc_bits
== 0)
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
));
305 /* read the alloc off disk */
306 inode
= ocfs2_get_system_file_inode(osb
, LOCAL_ALLOC_SYSTEM_INODE
,
314 status
= ocfs2_read_inode_block_full(inode
, &alloc_bh
,
315 OCFS2_BH_IGNORE_CACHE
);
321 alloc
= (struct ocfs2_dinode
*) alloc_bh
->b_data
;
322 la
= OCFS2_LOCAL_ALLOC(alloc
);
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
);
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
));
340 /* do a little verification. */
341 num_used
= ocfs2_local_alloc_count_bits(alloc
);
343 /* hopefully the local alloc has always been recovered before
346 || alloc
->id1
.bitmap1
.i_used
347 || alloc
->id1
.bitmap1
.i_total
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
);
355 osb
->local_alloc_bh
= alloc_bh
;
356 osb
->local_alloc_state
= OCFS2_LA_ENABLED
;
364 trace_ocfs2_load_local_alloc(osb
->local_alloc_bits
);
372 * return any unused bits to the bitmap and write out a clean
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.*/
378 void ocfs2_shutdown_local_alloc(struct ocfs2_super
*osb
)
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
;
389 cancel_delayed_work(&osb
->la_enable_wq
);
390 flush_workqueue(ocfs2_wq
);
392 if (osb
->local_alloc_state
== OCFS2_LA_UNUSED
)
396 ocfs2_get_system_file_inode(osb
,
397 LOCAL_ALLOC_SYSTEM_INODE
,
399 if (!local_alloc_inode
) {
405 osb
->local_alloc_state
= OCFS2_LA_DISABLED
;
407 ocfs2_resmap_uninit(&osb
->osb_la_resmap
);
409 main_bm_inode
= ocfs2_get_system_file_inode(osb
,
410 GLOBAL_BITMAP_SYSTEM_INODE
,
412 if (!main_bm_inode
) {
418 mutex_lock(&main_bm_inode
->i_mutex
);
420 status
= ocfs2_inode_lock(main_bm_inode
, &main_bm_bh
, 1);
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
));
434 bh
= osb
->local_alloc_bh
;
435 alloc
= (struct ocfs2_dinode
*) bh
->b_data
;
437 alloc_copy
= kmalloc(bh
->b_size
, GFP_NOFS
);
442 memcpy(alloc_copy
, alloc
, bh
->b_size
);
444 status
= ocfs2_journal_access_di(handle
, INODE_CACHE(local_alloc_inode
),
445 bh
, OCFS2_JOURNAL_ACCESS_WRITE
);
451 ocfs2_clear_local_alloc(alloc
);
452 ocfs2_journal_dirty(handle
, bh
);
455 osb
->local_alloc_bh
= NULL
;
456 osb
->local_alloc_state
= OCFS2_LA_UNUSED
;
458 status
= ocfs2_sync_local_to_main(osb
, handle
, alloc_copy
,
459 main_bm_inode
, main_bm_bh
);
464 ocfs2_commit_trans(osb
, handle
);
469 ocfs2_inode_unlock(main_bm_inode
, 1);
472 mutex_unlock(&main_bm_inode
->i_mutex
);
476 if (local_alloc_inode
)
477 iput(local_alloc_inode
);
484 * We want to free the bitmap bits outside of any recovery context as
485 * we'll need a cluster lock to do so, but we must clear the local
486 * alloc before giving up the recovered nodes journal. To solve this,
487 * we kmalloc a copy of the local alloc before it's change for the
488 * caller to process with ocfs2_complete_local_alloc_recovery
490 int ocfs2_begin_local_alloc_recovery(struct ocfs2_super
*osb
,
492 struct ocfs2_dinode
**alloc_copy
)
495 struct buffer_head
*alloc_bh
= NULL
;
496 struct inode
*inode
= NULL
;
497 struct ocfs2_dinode
*alloc
;
499 trace_ocfs2_begin_local_alloc_recovery(slot_num
);
503 inode
= ocfs2_get_system_file_inode(osb
,
504 LOCAL_ALLOC_SYSTEM_INODE
,
512 mutex_lock(&inode
->i_mutex
);
514 status
= ocfs2_read_inode_block_full(inode
, &alloc_bh
,
515 OCFS2_BH_IGNORE_CACHE
);
521 *alloc_copy
= kmalloc(alloc_bh
->b_size
, GFP_KERNEL
);
522 if (!(*alloc_copy
)) {
526 memcpy((*alloc_copy
), alloc_bh
->b_data
, alloc_bh
->b_size
);
528 alloc
= (struct ocfs2_dinode
*) alloc_bh
->b_data
;
529 ocfs2_clear_local_alloc(alloc
);
531 ocfs2_compute_meta_ecc(osb
->sb
, alloc_bh
->b_data
, &alloc
->i_check
);
532 status
= ocfs2_write_block(osb
, alloc_bh
, INODE_CACHE(inode
));
537 if ((status
< 0) && (*alloc_copy
)) {
545 mutex_unlock(&inode
->i_mutex
);
555 * Step 2: By now, we've completed the journal recovery, we've stamped
556 * a clean local alloc on disk and dropped the node out of the
557 * recovery map. Dlm locks will no longer stall, so lets clear out the
560 int ocfs2_complete_local_alloc_recovery(struct ocfs2_super
*osb
,
561 struct ocfs2_dinode
*alloc
)
565 struct buffer_head
*main_bm_bh
= NULL
;
566 struct inode
*main_bm_inode
;
568 main_bm_inode
= ocfs2_get_system_file_inode(osb
,
569 GLOBAL_BITMAP_SYSTEM_INODE
,
571 if (!main_bm_inode
) {
577 mutex_lock(&main_bm_inode
->i_mutex
);
579 status
= ocfs2_inode_lock(main_bm_inode
, &main_bm_bh
, 1);
585 handle
= ocfs2_start_trans(osb
, OCFS2_WINDOW_MOVE_CREDITS
);
586 if (IS_ERR(handle
)) {
587 status
= PTR_ERR(handle
);
593 /* we want the bitmap change to be recorded on disk asap */
596 status
= ocfs2_sync_local_to_main(osb
, handle
, alloc
,
597 main_bm_inode
, main_bm_bh
);
601 ocfs2_commit_trans(osb
, handle
);
604 ocfs2_inode_unlock(main_bm_inode
, 1);
607 mutex_unlock(&main_bm_inode
->i_mutex
);
615 ocfs2_init_steal_slots(osb
);
622 * make sure we've got at least bits_wanted contiguous bits in the
623 * local alloc. You lose them when you drop i_mutex.
625 * We will add ourselves to the transaction passed in, but may start
626 * our own in order to shift windows.
628 int ocfs2_reserve_local_alloc_bits(struct ocfs2_super
*osb
,
630 struct ocfs2_alloc_context
*ac
)
633 struct ocfs2_dinode
*alloc
;
634 struct inode
*local_alloc_inode
;
635 unsigned int free_bits
;
640 ocfs2_get_system_file_inode(osb
,
641 LOCAL_ALLOC_SYSTEM_INODE
,
643 if (!local_alloc_inode
) {
649 mutex_lock(&local_alloc_inode
->i_mutex
);
652 * We must double check state and allocator bits because
653 * another process may have changed them while holding i_mutex.
655 spin_lock(&osb
->osb_lock
);
656 if (!ocfs2_la_state_enabled(osb
) ||
657 (bits_wanted
> osb
->local_alloc_bits
)) {
658 spin_unlock(&osb
->osb_lock
);
662 spin_unlock(&osb
->osb_lock
);
664 alloc
= (struct ocfs2_dinode
*) osb
->local_alloc_bh
->b_data
;
666 #ifdef CONFIG_OCFS2_DEBUG_FS
667 if (le32_to_cpu(alloc
->id1
.bitmap1
.i_used
) !=
668 ocfs2_local_alloc_count_bits(alloc
)) {
669 ocfs2_error(osb
->sb
, "local alloc inode %llu says it has "
670 "%u free bits, but a count shows %u",
671 (unsigned long long)le64_to_cpu(alloc
->i_blkno
),
672 le32_to_cpu(alloc
->id1
.bitmap1
.i_used
),
673 ocfs2_local_alloc_count_bits(alloc
));
679 free_bits
= le32_to_cpu(alloc
->id1
.bitmap1
.i_total
) -
680 le32_to_cpu(alloc
->id1
.bitmap1
.i_used
);
681 if (bits_wanted
> free_bits
) {
682 /* uhoh, window change time. */
684 ocfs2_local_alloc_slide_window(osb
, local_alloc_inode
);
686 if (status
!= -ENOSPC
)
692 * Under certain conditions, the window slide code
693 * might have reduced the number of bits available or
694 * disabled the the local alloc entirely. Re-check
695 * here and return -ENOSPC if necessary.
698 if (!ocfs2_la_state_enabled(osb
))
701 free_bits
= le32_to_cpu(alloc
->id1
.bitmap1
.i_total
) -
702 le32_to_cpu(alloc
->id1
.bitmap1
.i_used
);
703 if (bits_wanted
> free_bits
)
707 ac
->ac_inode
= local_alloc_inode
;
708 /* We should never use localalloc from another slot */
709 ac
->ac_alloc_slot
= osb
->slot_num
;
710 ac
->ac_which
= OCFS2_AC_USE_LOCAL
;
711 get_bh(osb
->local_alloc_bh
);
712 ac
->ac_bh
= osb
->local_alloc_bh
;
715 if (status
< 0 && local_alloc_inode
) {
716 mutex_unlock(&local_alloc_inode
->i_mutex
);
717 iput(local_alloc_inode
);
720 trace_ocfs2_reserve_local_alloc_bits(
721 (unsigned long long)ac
->ac_max_block
,
722 bits_wanted
, osb
->slot_num
, status
);
729 int ocfs2_claim_local_alloc_bits(struct ocfs2_super
*osb
,
731 struct ocfs2_alloc_context
*ac
,
737 struct inode
*local_alloc_inode
;
739 struct ocfs2_dinode
*alloc
;
740 struct ocfs2_local_alloc
*la
;
742 BUG_ON(ac
->ac_which
!= OCFS2_AC_USE_LOCAL
);
744 local_alloc_inode
= ac
->ac_inode
;
745 alloc
= (struct ocfs2_dinode
*) osb
->local_alloc_bh
->b_data
;
746 la
= OCFS2_LOCAL_ALLOC(alloc
);
748 start
= ocfs2_local_alloc_find_clear_bits(osb
, alloc
, &bits_wanted
,
751 /* TODO: Shouldn't we just BUG here? */
757 bitmap
= la
->la_bitmap
;
758 *bit_off
= le32_to_cpu(la
->la_bm_off
) + start
;
759 *num_bits
= bits_wanted
;
761 status
= ocfs2_journal_access_di(handle
,
762 INODE_CACHE(local_alloc_inode
),
764 OCFS2_JOURNAL_ACCESS_WRITE
);
770 ocfs2_resmap_claimed_bits(&osb
->osb_la_resmap
, ac
->ac_resv
, start
,
774 ocfs2_set_bit(start
++, bitmap
);
776 le32_add_cpu(&alloc
->id1
.bitmap1
.i_used
, *num_bits
);
777 ocfs2_journal_dirty(handle
, osb
->local_alloc_bh
);
785 static u32
ocfs2_local_alloc_count_bits(struct ocfs2_dinode
*alloc
)
790 struct ocfs2_local_alloc
*la
= OCFS2_LOCAL_ALLOC(alloc
);
792 buffer
= la
->la_bitmap
;
793 for (i
= 0; i
< le16_to_cpu(la
->la_size
); i
++)
794 count
+= hweight8(buffer
[i
]);
796 trace_ocfs2_local_alloc_count_bits(count
);
800 static int ocfs2_local_alloc_find_clear_bits(struct ocfs2_super
*osb
,
801 struct ocfs2_dinode
*alloc
,
803 struct ocfs2_alloc_reservation
*resv
)
805 int numfound
, bitoff
, left
, startoff
, lastzero
;
807 struct ocfs2_alloc_reservation r
;
809 struct ocfs2_reservation_map
*resmap
= &osb
->osb_la_resmap
;
811 if (!alloc
->id1
.bitmap1
.i_total
) {
818 ocfs2_resv_init_once(&r
);
819 ocfs2_resv_set_type(&r
, OCFS2_RESV_FLAG_TMP
);
824 if (ocfs2_resmap_resv_bits(resmap
, resv
, &bitoff
, &numfound
) == 0) {
825 if (numfound
< *numbits
)
831 * Code error. While reservations are enabled, local
832 * allocation should _always_ go through them.
834 BUG_ON(osb
->osb_resv_level
!= 0);
837 * Reservations are disabled. Handle this the old way.
840 bitmap
= OCFS2_LOCAL_ALLOC(alloc
)->la_bitmap
;
842 numfound
= bitoff
= startoff
= 0;
844 left
= le32_to_cpu(alloc
->id1
.bitmap1
.i_total
);
845 while ((bitoff
= ocfs2_find_next_zero_bit(bitmap
, left
, startoff
)) != -1) {
846 if (bitoff
== left
) {
847 /* mlog(0, "bitoff (%d) == left", bitoff); */
850 /* mlog(0, "Found a zero: bitoff = %d, startoff = %d, "
851 "numfound = %d\n", bitoff, startoff, numfound);*/
853 /* Ok, we found a zero bit... is it contig. or do we
855 if (bitoff
== startoff
) {
856 /* we found a zero */
860 /* got a zero after some ones */
864 /* we got everything we needed */
865 if (numfound
== *numbits
) {
866 /* mlog(0, "Found it all!\n"); */
871 trace_ocfs2_local_alloc_find_clear_bits_search_bitmap(bitoff
, numfound
);
873 if (numfound
== *numbits
)
874 bitoff
= startoff
- numfound
;
880 ocfs2_resv_discard(resmap
, resv
);
882 trace_ocfs2_local_alloc_find_clear_bits(*numbits
,
883 le32_to_cpu(alloc
->id1
.bitmap1
.i_total
),
889 static void ocfs2_clear_local_alloc(struct ocfs2_dinode
*alloc
)
891 struct ocfs2_local_alloc
*la
= OCFS2_LOCAL_ALLOC(alloc
);
894 alloc
->id1
.bitmap1
.i_total
= 0;
895 alloc
->id1
.bitmap1
.i_used
= 0;
897 for(i
= 0; i
< le16_to_cpu(la
->la_size
); i
++)
898 la
->la_bitmap
[i
] = 0;
902 /* turn this on and uncomment below to aid debugging window shifts. */
903 static void ocfs2_verify_zero_bits(unsigned long *bitmap
,
907 unsigned int tmp
= count
;
909 if (ocfs2_test_bit(start
+ tmp
, bitmap
)) {
910 printk("ocfs2_verify_zero_bits: start = %u, count = "
911 "%u\n", start
, count
);
912 printk("ocfs2_verify_zero_bits: bit %u is set!",
921 * sync the local alloc to main bitmap.
923 * assumes you've already locked the main bitmap -- the bitmap inode
924 * passed is used for caching.
926 static int ocfs2_sync_local_to_main(struct ocfs2_super
*osb
,
928 struct ocfs2_dinode
*alloc
,
929 struct inode
*main_bm_inode
,
930 struct buffer_head
*main_bm_bh
)
933 int bit_off
, left
, count
, start
;
937 struct ocfs2_local_alloc
*la
= OCFS2_LOCAL_ALLOC(alloc
);
939 trace_ocfs2_sync_local_to_main(
940 le32_to_cpu(alloc
->id1
.bitmap1
.i_total
),
941 le32_to_cpu(alloc
->id1
.bitmap1
.i_used
));
943 if (!alloc
->id1
.bitmap1
.i_total
) {
947 if (le32_to_cpu(alloc
->id1
.bitmap1
.i_used
) ==
948 le32_to_cpu(alloc
->id1
.bitmap1
.i_total
)) {
952 la_start_blk
= ocfs2_clusters_to_blocks(osb
->sb
,
953 le32_to_cpu(la
->la_bm_off
));
954 bitmap
= la
->la_bitmap
;
955 start
= count
= bit_off
= 0;
956 left
= le32_to_cpu(alloc
->id1
.bitmap1
.i_total
);
958 while ((bit_off
= ocfs2_find_next_zero_bit(bitmap
, left
, start
))
960 if ((bit_off
< left
) && (bit_off
== start
)) {
966 blkno
= la_start_blk
+
967 ocfs2_clusters_to_blocks(osb
->sb
,
970 trace_ocfs2_sync_local_to_main_free(
971 count
, start
- count
,
972 (unsigned long long)la_start_blk
,
973 (unsigned long long)blkno
);
975 status
= ocfs2_release_clusters(handle
,
996 enum ocfs2_la_event
{
997 OCFS2_LA_EVENT_SLIDE
, /* Normal window slide. */
998 OCFS2_LA_EVENT_FRAGMENTED
, /* The global bitmap has
999 * enough bits theoretically
1000 * free, but a contiguous
1001 * allocation could not be
1003 OCFS2_LA_EVENT_ENOSPC
, /* Global bitmap doesn't have
1004 * enough bits free to satisfy
1007 #define OCFS2_LA_ENABLE_INTERVAL (30 * HZ)
1009 * Given an event, calculate the size of our next local alloc window.
1011 * This should always be called under i_mutex of the local alloc inode
1012 * so that local alloc disabling doesn't race with processes trying to
1013 * use the allocator.
1015 * Returns the state which the local alloc was left in. This value can
1016 * be ignored by some paths.
1018 static int ocfs2_recalc_la_window(struct ocfs2_super
*osb
,
1019 enum ocfs2_la_event event
)
1024 spin_lock(&osb
->osb_lock
);
1025 if (osb
->local_alloc_state
== OCFS2_LA_DISABLED
) {
1026 WARN_ON_ONCE(osb
->local_alloc_state
== OCFS2_LA_DISABLED
);
1031 * ENOSPC and fragmentation are treated similarly for now.
1033 if (event
== OCFS2_LA_EVENT_ENOSPC
||
1034 event
== OCFS2_LA_EVENT_FRAGMENTED
) {
1036 * We ran out of contiguous space in the primary
1037 * bitmap. Drastically reduce the number of bits used
1038 * by local alloc until we have to disable it.
1040 bits
= osb
->local_alloc_bits
>> 1;
1041 if (bits
> ocfs2_megabytes_to_clusters(osb
->sb
, 1)) {
1043 * By setting state to THROTTLED, we'll keep
1044 * the number of local alloc bits used down
1045 * until an event occurs which would give us
1046 * reason to assume the bitmap situation might
1049 osb
->local_alloc_state
= OCFS2_LA_THROTTLED
;
1050 osb
->local_alloc_bits
= bits
;
1052 osb
->local_alloc_state
= OCFS2_LA_DISABLED
;
1054 queue_delayed_work(ocfs2_wq
, &osb
->la_enable_wq
,
1055 OCFS2_LA_ENABLE_INTERVAL
);
1060 * Don't increase the size of the local alloc window until we
1061 * know we might be able to fulfill the request. Otherwise, we
1062 * risk bouncing around the global bitmap during periods of
1065 if (osb
->local_alloc_state
!= OCFS2_LA_THROTTLED
)
1066 osb
->local_alloc_bits
= osb
->local_alloc_default_bits
;
1069 state
= osb
->local_alloc_state
;
1070 spin_unlock(&osb
->osb_lock
);
1075 static int ocfs2_local_alloc_reserve_for_window(struct ocfs2_super
*osb
,
1076 struct ocfs2_alloc_context
**ac
,
1077 struct inode
**bitmap_inode
,
1078 struct buffer_head
**bitmap_bh
)
1082 *ac
= kzalloc(sizeof(struct ocfs2_alloc_context
), GFP_KERNEL
);
1090 (*ac
)->ac_bits_wanted
= osb
->local_alloc_default_bits
;
1091 status
= ocfs2_reserve_cluster_bitmap_bits(osb
, *ac
);
1092 if (status
== -ENOSPC
) {
1093 if (ocfs2_recalc_la_window(osb
, OCFS2_LA_EVENT_ENOSPC
) ==
1097 ocfs2_free_ac_resource(*ac
);
1098 memset(*ac
, 0, sizeof(struct ocfs2_alloc_context
));
1106 *bitmap_inode
= (*ac
)->ac_inode
;
1107 igrab(*bitmap_inode
);
1108 *bitmap_bh
= (*ac
)->ac_bh
;
1112 if ((status
< 0) && *ac
) {
1113 ocfs2_free_alloc_context(*ac
);
1123 * pass it the bitmap lock in lock_bh if you have it.
1125 static int ocfs2_local_alloc_new_window(struct ocfs2_super
*osb
,
1127 struct ocfs2_alloc_context
*ac
)
1130 u32 cluster_off
, cluster_count
;
1131 struct ocfs2_dinode
*alloc
= NULL
;
1132 struct ocfs2_local_alloc
*la
;
1134 alloc
= (struct ocfs2_dinode
*) osb
->local_alloc_bh
->b_data
;
1135 la
= OCFS2_LOCAL_ALLOC(alloc
);
1137 trace_ocfs2_local_alloc_new_window(
1138 le32_to_cpu(alloc
->id1
.bitmap1
.i_total
),
1139 osb
->local_alloc_bits
);
1141 /* Instruct the allocation code to try the most recently used
1142 * cluster group. We'll re-record the group used this pass
1144 ac
->ac_last_group
= osb
->la_last_gd
;
1146 /* we used the generic suballoc reserve function, but we set
1147 * everything up nicely, so there's no reason why we can't use
1148 * the more specific cluster api to claim bits. */
1149 status
= ocfs2_claim_clusters(handle
, ac
, osb
->local_alloc_bits
,
1150 &cluster_off
, &cluster_count
);
1151 if (status
== -ENOSPC
) {
1154 * Note: We could also try syncing the journal here to
1155 * allow use of any free bits which the current
1156 * transaction can't give us access to. --Mark
1158 if (ocfs2_recalc_la_window(osb
, OCFS2_LA_EVENT_FRAGMENTED
) ==
1162 ac
->ac_bits_wanted
= osb
->local_alloc_default_bits
;
1163 status
= ocfs2_claim_clusters(handle
, ac
,
1164 osb
->local_alloc_bits
,
1167 if (status
== -ENOSPC
)
1170 * We only shrunk the *minimum* number of in our
1171 * request - it's entirely possible that the allocator
1172 * might give us more than we asked for.
1175 spin_lock(&osb
->osb_lock
);
1176 osb
->local_alloc_bits
= cluster_count
;
1177 spin_unlock(&osb
->osb_lock
);
1181 if (status
!= -ENOSPC
)
1186 osb
->la_last_gd
= ac
->ac_last_group
;
1188 la
->la_bm_off
= cpu_to_le32(cluster_off
);
1189 alloc
->id1
.bitmap1
.i_total
= cpu_to_le32(cluster_count
);
1190 /* just in case... In the future when we find space ourselves,
1191 * we don't have to get all contiguous -- but we'll have to
1192 * set all previously used bits in bitmap and update
1193 * la_bits_set before setting the bits in the main bitmap. */
1194 alloc
->id1
.bitmap1
.i_used
= 0;
1195 memset(OCFS2_LOCAL_ALLOC(alloc
)->la_bitmap
, 0,
1196 le16_to_cpu(la
->la_size
));
1198 ocfs2_resmap_restart(&osb
->osb_la_resmap
, cluster_count
,
1199 OCFS2_LOCAL_ALLOC(alloc
)->la_bitmap
);
1201 trace_ocfs2_local_alloc_new_window_result(
1202 OCFS2_LOCAL_ALLOC(alloc
)->la_bm_off
,
1203 le32_to_cpu(alloc
->id1
.bitmap1
.i_total
));
1211 /* Note that we do *NOT* lock the local alloc inode here as
1212 * it's been locked already for us. */
1213 static int ocfs2_local_alloc_slide_window(struct ocfs2_super
*osb
,
1214 struct inode
*local_alloc_inode
)
1217 struct buffer_head
*main_bm_bh
= NULL
;
1218 struct inode
*main_bm_inode
= NULL
;
1219 handle_t
*handle
= NULL
;
1220 struct ocfs2_dinode
*alloc
;
1221 struct ocfs2_dinode
*alloc_copy
= NULL
;
1222 struct ocfs2_alloc_context
*ac
= NULL
;
1224 ocfs2_recalc_la_window(osb
, OCFS2_LA_EVENT_SLIDE
);
1226 /* This will lock the main bitmap for us. */
1227 status
= ocfs2_local_alloc_reserve_for_window(osb
,
1232 if (status
!= -ENOSPC
)
1237 handle
= ocfs2_start_trans(osb
, OCFS2_WINDOW_MOVE_CREDITS
);
1238 if (IS_ERR(handle
)) {
1239 status
= PTR_ERR(handle
);
1245 alloc
= (struct ocfs2_dinode
*) osb
->local_alloc_bh
->b_data
;
1247 /* We want to clear the local alloc before doing anything
1248 * else, so that if we error later during this operation,
1249 * local alloc shutdown won't try to double free main bitmap
1250 * bits. Make a copy so the sync function knows which bits to
1252 alloc_copy
= kmalloc(osb
->local_alloc_bh
->b_size
, GFP_NOFS
);
1258 memcpy(alloc_copy
, alloc
, osb
->local_alloc_bh
->b_size
);
1260 status
= ocfs2_journal_access_di(handle
,
1261 INODE_CACHE(local_alloc_inode
),
1262 osb
->local_alloc_bh
,
1263 OCFS2_JOURNAL_ACCESS_WRITE
);
1269 ocfs2_clear_local_alloc(alloc
);
1270 ocfs2_journal_dirty(handle
, osb
->local_alloc_bh
);
1272 status
= ocfs2_sync_local_to_main(osb
, handle
, alloc_copy
,
1273 main_bm_inode
, main_bm_bh
);
1279 status
= ocfs2_local_alloc_new_window(osb
, handle
, ac
);
1281 if (status
!= -ENOSPC
)
1286 atomic_inc(&osb
->alloc_stats
.moves
);
1290 ocfs2_commit_trans(osb
, handle
);
1295 iput(main_bm_inode
);
1301 ocfs2_free_alloc_context(ac
);