1 /* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
6 * metadata alloc and free
7 * Inspired by ext3 block groups.
9 * Copyright (C) 2002, 2004 Oracle. All rights reserved.
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public
13 * License as published by the Free Software Foundation; either
14 * version 2 of the License, or (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * General Public License for more details.
21 * You should have received a copy of the GNU General Public
22 * License along with this program; if not, write to the
23 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
24 * Boston, MA 021110-1307, USA.
28 #include <linux/types.h>
29 #include <linux/slab.h>
30 #include <linux/highmem.h>
32 #include <cluster/masklog.h>
37 #include "blockcheck.h"
41 #include "localalloc.h"
46 #include "ocfs2_trace.h"
48 #include "buffer_head_io.h"
50 #define NOT_ALLOC_NEW_GROUP 0
51 #define ALLOC_NEW_GROUP 0x1
52 #define ALLOC_GROUPS_FROM_GLOBAL 0x2
54 #define OCFS2_MAX_TO_STEAL 1024
56 struct ocfs2_suballoc_result
{
57 u64 sr_bg_blkno
; /* The bg we allocated from. Set
58 to 0 when a block group is
60 u64 sr_bg_stable_blkno
; /*
61 * Doesn't change, always
66 u64 sr_blkno
; /* The first allocated block */
67 unsigned int sr_bit_offset
; /* The bit in the bg */
68 unsigned int sr_bits
; /* How many bits we claimed */
71 static u64
ocfs2_group_from_res(struct ocfs2_suballoc_result
*res
)
73 if (res
->sr_blkno
== 0)
77 return res
->sr_bg_blkno
;
79 return ocfs2_which_suballoc_group(res
->sr_blkno
, res
->sr_bit_offset
);
82 static inline void ocfs2_debug_bg(struct ocfs2_group_desc
*bg
);
83 static inline void ocfs2_debug_suballoc_inode(struct ocfs2_dinode
*fe
);
84 static inline u16
ocfs2_find_victim_chain(struct ocfs2_chain_list
*cl
);
85 static int ocfs2_block_group_fill(handle_t
*handle
,
86 struct inode
*alloc_inode
,
87 struct buffer_head
*bg_bh
,
89 unsigned int group_clusters
,
91 struct ocfs2_chain_list
*cl
);
92 static int ocfs2_block_group_alloc(struct ocfs2_super
*osb
,
93 struct inode
*alloc_inode
,
94 struct buffer_head
*bh
,
96 u64
*last_alloc_group
,
99 static int ocfs2_cluster_group_search(struct inode
*inode
,
100 struct buffer_head
*group_bh
,
101 u32 bits_wanted
, u32 min_bits
,
103 struct ocfs2_suballoc_result
*res
);
104 static int ocfs2_block_group_search(struct inode
*inode
,
105 struct buffer_head
*group_bh
,
106 u32 bits_wanted
, u32 min_bits
,
108 struct ocfs2_suballoc_result
*res
);
109 static int ocfs2_claim_suballoc_bits(struct ocfs2_alloc_context
*ac
,
113 struct ocfs2_suballoc_result
*res
);
114 static int ocfs2_test_bg_bit_allocatable(struct buffer_head
*bg_bh
,
116 static int ocfs2_relink_block_group(handle_t
*handle
,
117 struct inode
*alloc_inode
,
118 struct buffer_head
*fe_bh
,
119 struct buffer_head
*bg_bh
,
120 struct buffer_head
*prev_bg_bh
,
122 static inline int ocfs2_block_group_reasonably_empty(struct ocfs2_group_desc
*bg
,
124 static inline u32
ocfs2_desc_bitmap_to_cluster_off(struct inode
*inode
,
127 static inline void ocfs2_block_to_cluster_group(struct inode
*inode
,
131 static int ocfs2_reserve_clusters_with_limit(struct ocfs2_super
*osb
,
132 u32 bits_wanted
, u64 max_block
,
134 struct ocfs2_alloc_context
**ac
);
136 void ocfs2_free_ac_resource(struct ocfs2_alloc_context
*ac
)
138 struct inode
*inode
= ac
->ac_inode
;
141 if (ac
->ac_which
!= OCFS2_AC_USE_LOCAL
)
142 ocfs2_inode_unlock(inode
, 1);
152 kfree(ac
->ac_find_loc_priv
);
153 ac
->ac_find_loc_priv
= NULL
;
156 void ocfs2_free_alloc_context(struct ocfs2_alloc_context
*ac
)
158 ocfs2_free_ac_resource(ac
);
162 static u32
ocfs2_bits_per_group(struct ocfs2_chain_list
*cl
)
164 return (u32
)le16_to_cpu(cl
->cl_cpg
) * (u32
)le16_to_cpu(cl
->cl_bpc
);
167 #define do_error(fmt, ...) \
170 mlog(ML_ERROR, fmt, ##__VA_ARGS__); \
172 return ocfs2_error(sb, fmt, ##__VA_ARGS__); \
175 static int ocfs2_validate_gd_self(struct super_block
*sb
,
176 struct buffer_head
*bh
,
179 struct ocfs2_group_desc
*gd
= (struct ocfs2_group_desc
*)bh
->b_data
;
181 if (!OCFS2_IS_VALID_GROUP_DESC(gd
)) {
182 do_error("Group descriptor #%llu has bad signature %.*s\n",
183 (unsigned long long)bh
->b_blocknr
, 7,
187 if (le64_to_cpu(gd
->bg_blkno
) != bh
->b_blocknr
) {
188 do_error("Group descriptor #%llu has an invalid bg_blkno of %llu\n",
189 (unsigned long long)bh
->b_blocknr
,
190 (unsigned long long)le64_to_cpu(gd
->bg_blkno
));
193 if (le32_to_cpu(gd
->bg_generation
) != OCFS2_SB(sb
)->fs_generation
) {
194 do_error("Group descriptor #%llu has an invalid fs_generation of #%u\n",
195 (unsigned long long)bh
->b_blocknr
,
196 le32_to_cpu(gd
->bg_generation
));
199 if (le16_to_cpu(gd
->bg_free_bits_count
) > le16_to_cpu(gd
->bg_bits
)) {
200 do_error("Group descriptor #%llu has bit count %u but claims that %u are free\n",
201 (unsigned long long)bh
->b_blocknr
,
202 le16_to_cpu(gd
->bg_bits
),
203 le16_to_cpu(gd
->bg_free_bits_count
));
206 if (le16_to_cpu(gd
->bg_bits
) > (8 * le16_to_cpu(gd
->bg_size
))) {
207 do_error("Group descriptor #%llu has bit count %u but max bitmap bits of %u\n",
208 (unsigned long long)bh
->b_blocknr
,
209 le16_to_cpu(gd
->bg_bits
),
210 8 * le16_to_cpu(gd
->bg_size
));
216 static int ocfs2_validate_gd_parent(struct super_block
*sb
,
217 struct ocfs2_dinode
*di
,
218 struct buffer_head
*bh
,
221 unsigned int max_bits
;
222 struct ocfs2_group_desc
*gd
= (struct ocfs2_group_desc
*)bh
->b_data
;
224 if (di
->i_blkno
!= gd
->bg_parent_dinode
) {
225 do_error("Group descriptor #%llu has bad parent pointer (%llu, expected %llu)\n",
226 (unsigned long long)bh
->b_blocknr
,
227 (unsigned long long)le64_to_cpu(gd
->bg_parent_dinode
),
228 (unsigned long long)le64_to_cpu(di
->i_blkno
));
231 max_bits
= le16_to_cpu(di
->id2
.i_chain
.cl_cpg
) * le16_to_cpu(di
->id2
.i_chain
.cl_bpc
);
232 if (le16_to_cpu(gd
->bg_bits
) > max_bits
) {
233 do_error("Group descriptor #%llu has bit count of %u\n",
234 (unsigned long long)bh
->b_blocknr
,
235 le16_to_cpu(gd
->bg_bits
));
238 /* In resize, we may meet the case bg_chain == cl_next_free_rec. */
239 if ((le16_to_cpu(gd
->bg_chain
) >
240 le16_to_cpu(di
->id2
.i_chain
.cl_next_free_rec
)) ||
241 ((le16_to_cpu(gd
->bg_chain
) ==
242 le16_to_cpu(di
->id2
.i_chain
.cl_next_free_rec
)) && !resize
)) {
243 do_error("Group descriptor #%llu has bad chain %u\n",
244 (unsigned long long)bh
->b_blocknr
,
245 le16_to_cpu(gd
->bg_chain
));
254 * This version only prints errors. It does not fail the filesystem, and
255 * exists only for resize.
257 int ocfs2_check_group_descriptor(struct super_block
*sb
,
258 struct ocfs2_dinode
*di
,
259 struct buffer_head
*bh
)
262 struct ocfs2_group_desc
*gd
= (struct ocfs2_group_desc
*)bh
->b_data
;
264 BUG_ON(!buffer_uptodate(bh
));
267 * If the ecc fails, we return the error but otherwise
268 * leave the filesystem running. We know any error is
269 * local to this block.
271 rc
= ocfs2_validate_meta_ecc(sb
, bh
->b_data
, &gd
->bg_check
);
274 "Checksum failed for group descriptor %llu\n",
275 (unsigned long long)bh
->b_blocknr
);
277 rc
= ocfs2_validate_gd_self(sb
, bh
, 1);
279 rc
= ocfs2_validate_gd_parent(sb
, di
, bh
, 1);
284 static int ocfs2_validate_group_descriptor(struct super_block
*sb
,
285 struct buffer_head
*bh
)
288 struct ocfs2_group_desc
*gd
= (struct ocfs2_group_desc
*)bh
->b_data
;
290 trace_ocfs2_validate_group_descriptor(
291 (unsigned long long)bh
->b_blocknr
);
293 BUG_ON(!buffer_uptodate(bh
));
296 * If the ecc fails, we return the error but otherwise
297 * leave the filesystem running. We know any error is
298 * local to this block.
300 rc
= ocfs2_validate_meta_ecc(sb
, bh
->b_data
, &gd
->bg_check
);
305 * Errors after here are fatal.
308 return ocfs2_validate_gd_self(sb
, bh
, 0);
311 int ocfs2_read_group_descriptor(struct inode
*inode
, struct ocfs2_dinode
*di
,
312 u64 gd_blkno
, struct buffer_head
**bh
)
315 struct buffer_head
*tmp
= *bh
;
317 rc
= ocfs2_read_block(INODE_CACHE(inode
), gd_blkno
, &tmp
,
318 ocfs2_validate_group_descriptor
);
322 rc
= ocfs2_validate_gd_parent(inode
->i_sb
, di
, tmp
, 0);
328 /* If ocfs2_read_block() got us a new bh, pass it up. */
336 static void ocfs2_bg_discontig_add_extent(struct ocfs2_super
*osb
,
337 struct ocfs2_group_desc
*bg
,
338 struct ocfs2_chain_list
*cl
,
339 u64 p_blkno
, unsigned int clusters
)
341 struct ocfs2_extent_list
*el
= &bg
->bg_list
;
342 struct ocfs2_extent_rec
*rec
;
344 BUG_ON(!ocfs2_supports_discontig_bg(osb
));
345 if (!el
->l_next_free_rec
)
346 el
->l_count
= cpu_to_le16(ocfs2_extent_recs_per_gd(osb
->sb
));
347 rec
= &el
->l_recs
[le16_to_cpu(el
->l_next_free_rec
)];
348 rec
->e_blkno
= cpu_to_le64(p_blkno
);
349 rec
->e_cpos
= cpu_to_le32(le16_to_cpu(bg
->bg_bits
) /
350 le16_to_cpu(cl
->cl_bpc
));
351 rec
->e_leaf_clusters
= cpu_to_le16(clusters
);
352 le16_add_cpu(&bg
->bg_bits
, clusters
* le16_to_cpu(cl
->cl_bpc
));
353 le16_add_cpu(&bg
->bg_free_bits_count
,
354 clusters
* le16_to_cpu(cl
->cl_bpc
));
355 le16_add_cpu(&el
->l_next_free_rec
, 1);
358 static int ocfs2_block_group_fill(handle_t
*handle
,
359 struct inode
*alloc_inode
,
360 struct buffer_head
*bg_bh
,
362 unsigned int group_clusters
,
364 struct ocfs2_chain_list
*cl
)
367 struct ocfs2_super
*osb
= OCFS2_SB(alloc_inode
->i_sb
);
368 struct ocfs2_group_desc
*bg
= (struct ocfs2_group_desc
*) bg_bh
->b_data
;
369 struct super_block
* sb
= alloc_inode
->i_sb
;
371 if (((unsigned long long) bg_bh
->b_blocknr
) != group_blkno
) {
372 status
= ocfs2_error(alloc_inode
->i_sb
,
373 "group block (%llu) != b_blocknr (%llu)\n",
374 (unsigned long long)group_blkno
,
375 (unsigned long long) bg_bh
->b_blocknr
);
379 status
= ocfs2_journal_access_gd(handle
,
380 INODE_CACHE(alloc_inode
),
382 OCFS2_JOURNAL_ACCESS_CREATE
);
388 memset(bg
, 0, sb
->s_blocksize
);
389 strcpy(bg
->bg_signature
, OCFS2_GROUP_DESC_SIGNATURE
);
390 bg
->bg_generation
= cpu_to_le32(OCFS2_SB(sb
)->fs_generation
);
391 bg
->bg_size
= cpu_to_le16(ocfs2_group_bitmap_size(sb
, 1,
392 osb
->s_feature_incompat
));
393 bg
->bg_chain
= cpu_to_le16(my_chain
);
394 bg
->bg_next_group
= cl
->cl_recs
[my_chain
].c_blkno
;
395 bg
->bg_parent_dinode
= cpu_to_le64(OCFS2_I(alloc_inode
)->ip_blkno
);
396 bg
->bg_blkno
= cpu_to_le64(group_blkno
);
397 if (group_clusters
== le16_to_cpu(cl
->cl_cpg
))
398 bg
->bg_bits
= cpu_to_le16(ocfs2_bits_per_group(cl
));
400 ocfs2_bg_discontig_add_extent(osb
, bg
, cl
, group_blkno
,
403 /* set the 1st bit in the bitmap to account for the descriptor block */
404 ocfs2_set_bit(0, (unsigned long *)bg
->bg_bitmap
);
405 bg
->bg_free_bits_count
= cpu_to_le16(le16_to_cpu(bg
->bg_bits
) - 1);
407 ocfs2_journal_dirty(handle
, bg_bh
);
409 /* There is no need to zero out or otherwise initialize the
410 * other blocks in a group - All valid FS metadata in a block
411 * group stores the superblock fs_generation value at
412 * allocation time. */
420 static inline u16
ocfs2_find_smallest_chain(struct ocfs2_chain_list
*cl
)
425 while (curr
< le16_to_cpu(cl
->cl_count
)) {
426 if (le32_to_cpu(cl
->cl_recs
[best
].c_total
) >
427 le32_to_cpu(cl
->cl_recs
[curr
].c_total
))
434 static struct buffer_head
*
435 ocfs2_block_group_alloc_contig(struct ocfs2_super
*osb
, handle_t
*handle
,
436 struct inode
*alloc_inode
,
437 struct ocfs2_alloc_context
*ac
,
438 struct ocfs2_chain_list
*cl
)
441 u32 bit_off
, num_bits
;
443 struct buffer_head
*bg_bh
;
444 unsigned int alloc_rec
= ocfs2_find_smallest_chain(cl
);
446 status
= ocfs2_claim_clusters(handle
, ac
,
447 le16_to_cpu(cl
->cl_cpg
), &bit_off
,
450 if (status
!= -ENOSPC
)
455 /* setup the group */
456 bg_blkno
= ocfs2_clusters_to_blocks(osb
->sb
, bit_off
);
457 trace_ocfs2_block_group_alloc_contig(
458 (unsigned long long)bg_blkno
, alloc_rec
);
460 bg_bh
= sb_getblk(osb
->sb
, bg_blkno
);
466 ocfs2_set_new_buffer_uptodate(INODE_CACHE(alloc_inode
), bg_bh
);
468 status
= ocfs2_block_group_fill(handle
, alloc_inode
, bg_bh
,
469 bg_blkno
, num_bits
, alloc_rec
, cl
);
476 return status
? ERR_PTR(status
) : bg_bh
;
479 static int ocfs2_block_group_claim_bits(struct ocfs2_super
*osb
,
481 struct ocfs2_alloc_context
*ac
,
482 unsigned int min_bits
,
483 u32
*bit_off
, u32
*num_bits
)
488 status
= ocfs2_claim_clusters(handle
, ac
, min_bits
,
490 if (status
!= -ENOSPC
)
499 static int ocfs2_block_group_grow_discontig(handle_t
*handle
,
500 struct inode
*alloc_inode
,
501 struct buffer_head
*bg_bh
,
502 struct ocfs2_alloc_context
*ac
,
503 struct ocfs2_chain_list
*cl
,
504 unsigned int min_bits
)
507 struct ocfs2_super
*osb
= OCFS2_SB(alloc_inode
->i_sb
);
508 struct ocfs2_group_desc
*bg
=
509 (struct ocfs2_group_desc
*)bg_bh
->b_data
;
510 unsigned int needed
= le16_to_cpu(cl
->cl_cpg
) -
511 le16_to_cpu(bg
->bg_bits
) / le16_to_cpu(cl
->cl_bpc
);
512 u32 p_cpos
, clusters
;
514 struct ocfs2_extent_list
*el
= &bg
->bg_list
;
516 status
= ocfs2_journal_access_gd(handle
,
517 INODE_CACHE(alloc_inode
),
519 OCFS2_JOURNAL_ACCESS_CREATE
);
525 while ((needed
> 0) && (le16_to_cpu(el
->l_next_free_rec
) <
526 le16_to_cpu(el
->l_count
))) {
527 if (min_bits
> needed
)
529 status
= ocfs2_block_group_claim_bits(osb
, handle
, ac
,
533 if (status
!= -ENOSPC
)
537 p_blkno
= ocfs2_clusters_to_blocks(osb
->sb
, p_cpos
);
538 ocfs2_bg_discontig_add_extent(osb
, bg
, cl
, p_blkno
,
542 needed
= le16_to_cpu(cl
->cl_cpg
) -
543 le16_to_cpu(bg
->bg_bits
) / le16_to_cpu(cl
->cl_bpc
);
548 * We have used up all the extent rec but can't fill up
549 * the cpg. So bail out.
555 ocfs2_journal_dirty(handle
, bg_bh
);
561 static void ocfs2_bg_alloc_cleanup(handle_t
*handle
,
562 struct ocfs2_alloc_context
*cluster_ac
,
563 struct inode
*alloc_inode
,
564 struct buffer_head
*bg_bh
)
567 struct ocfs2_group_desc
*bg
;
568 struct ocfs2_extent_list
*el
;
569 struct ocfs2_extent_rec
*rec
;
574 bg
= (struct ocfs2_group_desc
*)bg_bh
->b_data
;
576 for (i
= 0; i
< le16_to_cpu(el
->l_next_free_rec
); i
++) {
577 rec
= &el
->l_recs
[i
];
578 ret
= ocfs2_free_clusters(handle
, cluster_ac
->ac_inode
,
580 le64_to_cpu(rec
->e_blkno
),
581 le16_to_cpu(rec
->e_leaf_clusters
));
584 /* Try all the clusters to free */
587 ocfs2_remove_from_cache(INODE_CACHE(alloc_inode
), bg_bh
);
591 static struct buffer_head
*
592 ocfs2_block_group_alloc_discontig(handle_t
*handle
,
593 struct inode
*alloc_inode
,
594 struct ocfs2_alloc_context
*ac
,
595 struct ocfs2_chain_list
*cl
)
598 u32 bit_off
, num_bits
;
600 unsigned int min_bits
= le16_to_cpu(cl
->cl_cpg
) >> 1;
601 struct buffer_head
*bg_bh
= NULL
;
602 unsigned int alloc_rec
= ocfs2_find_smallest_chain(cl
);
603 struct ocfs2_super
*osb
= OCFS2_SB(alloc_inode
->i_sb
);
605 if (!ocfs2_supports_discontig_bg(osb
)) {
610 status
= ocfs2_extend_trans(handle
,
611 ocfs2_calc_bg_discontig_credits(osb
->sb
));
618 * We're going to be grabbing from multiple cluster groups.
619 * We don't have enough credits to relink them all, and the
620 * cluster groups will be staying in cache for the duration of
623 ac
->ac_disable_chain_relink
= 1;
625 /* Claim the first region */
626 status
= ocfs2_block_group_claim_bits(osb
, handle
, ac
, min_bits
,
627 &bit_off
, &num_bits
);
629 if (status
!= -ENOSPC
)
635 /* setup the group */
636 bg_blkno
= ocfs2_clusters_to_blocks(osb
->sb
, bit_off
);
637 trace_ocfs2_block_group_alloc_discontig(
638 (unsigned long long)bg_blkno
, alloc_rec
);
640 bg_bh
= sb_getblk(osb
->sb
, bg_blkno
);
646 ocfs2_set_new_buffer_uptodate(INODE_CACHE(alloc_inode
), bg_bh
);
648 status
= ocfs2_block_group_fill(handle
, alloc_inode
, bg_bh
,
649 bg_blkno
, num_bits
, alloc_rec
, cl
);
655 status
= ocfs2_block_group_grow_discontig(handle
, alloc_inode
,
656 bg_bh
, ac
, cl
, min_bits
);
662 ocfs2_bg_alloc_cleanup(handle
, ac
, alloc_inode
, bg_bh
);
663 return status
? ERR_PTR(status
) : bg_bh
;
667 * We expect the block group allocator to already be locked.
669 static int ocfs2_block_group_alloc(struct ocfs2_super
*osb
,
670 struct inode
*alloc_inode
,
671 struct buffer_head
*bh
,
673 u64
*last_alloc_group
,
677 struct ocfs2_dinode
*fe
= (struct ocfs2_dinode
*) bh
->b_data
;
678 struct ocfs2_chain_list
*cl
;
679 struct ocfs2_alloc_context
*ac
= NULL
;
680 handle_t
*handle
= NULL
;
682 struct buffer_head
*bg_bh
= NULL
;
683 struct ocfs2_group_desc
*bg
;
685 BUG_ON(ocfs2_is_cluster_bitmap(alloc_inode
));
687 cl
= &fe
->id2
.i_chain
;
688 status
= ocfs2_reserve_clusters_with_limit(osb
,
689 le16_to_cpu(cl
->cl_cpg
),
690 max_block
, flags
, &ac
);
692 if (status
!= -ENOSPC
)
697 credits
= ocfs2_calc_group_alloc_credits(osb
->sb
,
698 le16_to_cpu(cl
->cl_cpg
));
699 handle
= ocfs2_start_trans(osb
, credits
);
700 if (IS_ERR(handle
)) {
701 status
= PTR_ERR(handle
);
707 if (last_alloc_group
&& *last_alloc_group
!= 0) {
708 trace_ocfs2_block_group_alloc(
709 (unsigned long long)*last_alloc_group
);
710 ac
->ac_last_group
= *last_alloc_group
;
713 bg_bh
= ocfs2_block_group_alloc_contig(osb
, handle
, alloc_inode
,
715 if (IS_ERR(bg_bh
) && (PTR_ERR(bg_bh
) == -ENOSPC
))
716 bg_bh
= ocfs2_block_group_alloc_discontig(handle
,
720 status
= PTR_ERR(bg_bh
);
722 if (status
!= -ENOSPC
)
726 bg
= (struct ocfs2_group_desc
*) bg_bh
->b_data
;
728 status
= ocfs2_journal_access_di(handle
, INODE_CACHE(alloc_inode
),
729 bh
, OCFS2_JOURNAL_ACCESS_WRITE
);
735 alloc_rec
= le16_to_cpu(bg
->bg_chain
);
736 le32_add_cpu(&cl
->cl_recs
[alloc_rec
].c_free
,
737 le16_to_cpu(bg
->bg_free_bits_count
));
738 le32_add_cpu(&cl
->cl_recs
[alloc_rec
].c_total
,
739 le16_to_cpu(bg
->bg_bits
));
740 cl
->cl_recs
[alloc_rec
].c_blkno
= bg
->bg_blkno
;
741 if (le16_to_cpu(cl
->cl_next_free_rec
) < le16_to_cpu(cl
->cl_count
))
742 le16_add_cpu(&cl
->cl_next_free_rec
, 1);
744 le32_add_cpu(&fe
->id1
.bitmap1
.i_used
, le16_to_cpu(bg
->bg_bits
) -
745 le16_to_cpu(bg
->bg_free_bits_count
));
746 le32_add_cpu(&fe
->id1
.bitmap1
.i_total
, le16_to_cpu(bg
->bg_bits
));
747 le32_add_cpu(&fe
->i_clusters
, le16_to_cpu(cl
->cl_cpg
));
749 ocfs2_journal_dirty(handle
, bh
);
751 spin_lock(&OCFS2_I(alloc_inode
)->ip_lock
);
752 OCFS2_I(alloc_inode
)->ip_clusters
= le32_to_cpu(fe
->i_clusters
);
753 fe
->i_size
= cpu_to_le64(ocfs2_clusters_to_bytes(alloc_inode
->i_sb
,
754 le32_to_cpu(fe
->i_clusters
)));
755 spin_unlock(&OCFS2_I(alloc_inode
)->ip_lock
);
756 i_size_write(alloc_inode
, le64_to_cpu(fe
->i_size
));
757 alloc_inode
->i_blocks
= ocfs2_inode_sector_count(alloc_inode
);
758 ocfs2_update_inode_fsync_trans(handle
, alloc_inode
, 0);
762 /* save the new last alloc group so that the caller can cache it. */
763 if (last_alloc_group
)
764 *last_alloc_group
= ac
->ac_last_group
;
768 ocfs2_commit_trans(osb
, handle
);
771 ocfs2_free_alloc_context(ac
);
780 static int ocfs2_reserve_suballoc_bits(struct ocfs2_super
*osb
,
781 struct ocfs2_alloc_context
*ac
,
784 u64
*last_alloc_group
,
788 u32 bits_wanted
= ac
->ac_bits_wanted
;
789 struct inode
*alloc_inode
;
790 struct buffer_head
*bh
= NULL
;
791 struct ocfs2_dinode
*fe
;
794 alloc_inode
= ocfs2_get_system_file_inode(osb
, type
, slot
);
800 inode_lock(alloc_inode
);
802 status
= ocfs2_inode_lock(alloc_inode
, &bh
, 1);
804 inode_unlock(alloc_inode
);
811 ac
->ac_inode
= alloc_inode
;
812 ac
->ac_alloc_slot
= slot
;
814 fe
= (struct ocfs2_dinode
*) bh
->b_data
;
816 /* The bh was validated by the inode read inside
817 * ocfs2_inode_lock(). Any corruption is a code bug. */
818 BUG_ON(!OCFS2_IS_VALID_DINODE(fe
));
820 if (!(fe
->i_flags
& cpu_to_le32(OCFS2_CHAIN_FL
))) {
821 status
= ocfs2_error(alloc_inode
->i_sb
,
822 "Invalid chain allocator %llu\n",
823 (unsigned long long)le64_to_cpu(fe
->i_blkno
));
827 free_bits
= le32_to_cpu(fe
->id1
.bitmap1
.i_total
) -
828 le32_to_cpu(fe
->id1
.bitmap1
.i_used
);
830 if (bits_wanted
> free_bits
) {
831 /* cluster bitmap never grows */
832 if (ocfs2_is_cluster_bitmap(alloc_inode
)) {
833 trace_ocfs2_reserve_suballoc_bits_nospc(bits_wanted
,
839 if (!(flags
& ALLOC_NEW_GROUP
)) {
840 trace_ocfs2_reserve_suballoc_bits_no_new_group(
841 slot
, bits_wanted
, free_bits
);
846 status
= ocfs2_block_group_alloc(osb
, alloc_inode
, bh
,
848 last_alloc_group
, flags
);
850 if (status
!= -ENOSPC
)
854 atomic_inc(&osb
->alloc_stats
.bg_extends
);
856 /* You should never ask for this much metadata */
858 (le32_to_cpu(fe
->id1
.bitmap1
.i_total
)
859 - le32_to_cpu(fe
->id1
.bitmap1
.i_used
)));
872 static void ocfs2_init_inode_steal_slot(struct ocfs2_super
*osb
)
874 spin_lock(&osb
->osb_lock
);
875 osb
->s_inode_steal_slot
= OCFS2_INVALID_SLOT
;
876 spin_unlock(&osb
->osb_lock
);
877 atomic_set(&osb
->s_num_inodes_stolen
, 0);
880 static void ocfs2_init_meta_steal_slot(struct ocfs2_super
*osb
)
882 spin_lock(&osb
->osb_lock
);
883 osb
->s_meta_steal_slot
= OCFS2_INVALID_SLOT
;
884 spin_unlock(&osb
->osb_lock
);
885 atomic_set(&osb
->s_num_meta_stolen
, 0);
888 void ocfs2_init_steal_slots(struct ocfs2_super
*osb
)
890 ocfs2_init_inode_steal_slot(osb
);
891 ocfs2_init_meta_steal_slot(osb
);
894 static void __ocfs2_set_steal_slot(struct ocfs2_super
*osb
, int slot
, int type
)
896 spin_lock(&osb
->osb_lock
);
897 if (type
== INODE_ALLOC_SYSTEM_INODE
)
898 osb
->s_inode_steal_slot
= slot
;
899 else if (type
== EXTENT_ALLOC_SYSTEM_INODE
)
900 osb
->s_meta_steal_slot
= slot
;
901 spin_unlock(&osb
->osb_lock
);
904 static int __ocfs2_get_steal_slot(struct ocfs2_super
*osb
, int type
)
906 int slot
= OCFS2_INVALID_SLOT
;
908 spin_lock(&osb
->osb_lock
);
909 if (type
== INODE_ALLOC_SYSTEM_INODE
)
910 slot
= osb
->s_inode_steal_slot
;
911 else if (type
== EXTENT_ALLOC_SYSTEM_INODE
)
912 slot
= osb
->s_meta_steal_slot
;
913 spin_unlock(&osb
->osb_lock
);
918 static int ocfs2_get_inode_steal_slot(struct ocfs2_super
*osb
)
920 return __ocfs2_get_steal_slot(osb
, INODE_ALLOC_SYSTEM_INODE
);
923 static int ocfs2_get_meta_steal_slot(struct ocfs2_super
*osb
)
925 return __ocfs2_get_steal_slot(osb
, EXTENT_ALLOC_SYSTEM_INODE
);
928 static int ocfs2_steal_resource(struct ocfs2_super
*osb
,
929 struct ocfs2_alloc_context
*ac
,
932 int i
, status
= -ENOSPC
;
933 int slot
= __ocfs2_get_steal_slot(osb
, type
);
935 /* Start to steal resource from the first slot after ours. */
936 if (slot
== OCFS2_INVALID_SLOT
)
937 slot
= osb
->slot_num
+ 1;
939 for (i
= 0; i
< osb
->max_slots
; i
++, slot
++) {
940 if (slot
== osb
->max_slots
)
943 if (slot
== osb
->slot_num
)
946 status
= ocfs2_reserve_suballoc_bits(osb
, ac
,
949 NOT_ALLOC_NEW_GROUP
);
951 __ocfs2_set_steal_slot(osb
, slot
, type
);
955 ocfs2_free_ac_resource(ac
);
961 static int ocfs2_steal_inode(struct ocfs2_super
*osb
,
962 struct ocfs2_alloc_context
*ac
)
964 return ocfs2_steal_resource(osb
, ac
, INODE_ALLOC_SYSTEM_INODE
);
967 static int ocfs2_steal_meta(struct ocfs2_super
*osb
,
968 struct ocfs2_alloc_context
*ac
)
970 return ocfs2_steal_resource(osb
, ac
, EXTENT_ALLOC_SYSTEM_INODE
);
973 int ocfs2_reserve_new_metadata_blocks(struct ocfs2_super
*osb
,
975 struct ocfs2_alloc_context
**ac
)
978 int slot
= ocfs2_get_meta_steal_slot(osb
);
980 *ac
= kzalloc(sizeof(struct ocfs2_alloc_context
), GFP_KERNEL
);
987 (*ac
)->ac_bits_wanted
= blocks
;
988 (*ac
)->ac_which
= OCFS2_AC_USE_META
;
989 (*ac
)->ac_group_search
= ocfs2_block_group_search
;
991 if (slot
!= OCFS2_INVALID_SLOT
&&
992 atomic_read(&osb
->s_num_meta_stolen
) < OCFS2_MAX_TO_STEAL
)
995 atomic_set(&osb
->s_num_meta_stolen
, 0);
996 status
= ocfs2_reserve_suballoc_bits(osb
, (*ac
),
997 EXTENT_ALLOC_SYSTEM_INODE
,
998 (u32
)osb
->slot_num
, NULL
,
999 ALLOC_GROUPS_FROM_GLOBAL
|ALLOC_NEW_GROUP
);
1004 if (slot
!= OCFS2_INVALID_SLOT
)
1005 ocfs2_init_meta_steal_slot(osb
);
1007 } else if (status
< 0 && status
!= -ENOSPC
) {
1012 ocfs2_free_ac_resource(*ac
);
1015 status
= ocfs2_steal_meta(osb
, *ac
);
1016 atomic_inc(&osb
->s_num_meta_stolen
);
1018 if (status
!= -ENOSPC
)
1025 if ((status
< 0) && *ac
) {
1026 ocfs2_free_alloc_context(*ac
);
1035 int ocfs2_reserve_new_metadata(struct ocfs2_super
*osb
,
1036 struct ocfs2_extent_list
*root_el
,
1037 struct ocfs2_alloc_context
**ac
)
1039 return ocfs2_reserve_new_metadata_blocks(osb
,
1040 ocfs2_extend_meta_needed(root_el
),
1044 int ocfs2_reserve_new_inode(struct ocfs2_super
*osb
,
1045 struct ocfs2_alloc_context
**ac
)
1048 int slot
= ocfs2_get_inode_steal_slot(osb
);
1051 *ac
= kzalloc(sizeof(struct ocfs2_alloc_context
), GFP_KERNEL
);
1058 (*ac
)->ac_bits_wanted
= 1;
1059 (*ac
)->ac_which
= OCFS2_AC_USE_INODE
;
1061 (*ac
)->ac_group_search
= ocfs2_block_group_search
;
1064 * stat(2) can't handle i_ino > 32bits, so we tell the
1065 * lower levels not to allocate us a block group past that
1066 * limit. The 'inode64' mount option avoids this behavior.
1068 if (!(osb
->s_mount_opt
& OCFS2_MOUNT_INODE64
))
1069 (*ac
)->ac_max_block
= (u32
)~0U;
1072 * slot is set when we successfully steal inode from other nodes.
1073 * It is reset in 3 places:
1074 * 1. when we flush the truncate log
1075 * 2. when we complete local alloc recovery.
1076 * 3. when we successfully allocate from our own slot.
1077 * After it is set, we will go on stealing inodes until we find the
1078 * need to check our slots to see whether there is some space for us.
1080 if (slot
!= OCFS2_INVALID_SLOT
&&
1081 atomic_read(&osb
->s_num_inodes_stolen
) < OCFS2_MAX_TO_STEAL
)
1084 atomic_set(&osb
->s_num_inodes_stolen
, 0);
1085 alloc_group
= osb
->osb_inode_alloc_group
;
1086 status
= ocfs2_reserve_suballoc_bits(osb
, *ac
,
1087 INODE_ALLOC_SYSTEM_INODE
,
1091 ALLOC_GROUPS_FROM_GLOBAL
);
1095 spin_lock(&osb
->osb_lock
);
1096 osb
->osb_inode_alloc_group
= alloc_group
;
1097 spin_unlock(&osb
->osb_lock
);
1098 trace_ocfs2_reserve_new_inode_new_group(
1099 (unsigned long long)alloc_group
);
1102 * Some inodes must be freed by us, so try to allocate
1103 * from our own next time.
1105 if (slot
!= OCFS2_INVALID_SLOT
)
1106 ocfs2_init_inode_steal_slot(osb
);
1108 } else if (status
< 0 && status
!= -ENOSPC
) {
1113 ocfs2_free_ac_resource(*ac
);
1116 status
= ocfs2_steal_inode(osb
, *ac
);
1117 atomic_inc(&osb
->s_num_inodes_stolen
);
1119 if (status
!= -ENOSPC
)
1126 if ((status
< 0) && *ac
) {
1127 ocfs2_free_alloc_context(*ac
);
1136 /* local alloc code has to do the same thing, so rather than do this
1138 int ocfs2_reserve_cluster_bitmap_bits(struct ocfs2_super
*osb
,
1139 struct ocfs2_alloc_context
*ac
)
1143 ac
->ac_which
= OCFS2_AC_USE_MAIN
;
1144 ac
->ac_group_search
= ocfs2_cluster_group_search
;
1146 status
= ocfs2_reserve_suballoc_bits(osb
, ac
,
1147 GLOBAL_BITMAP_SYSTEM_INODE
,
1148 OCFS2_INVALID_SLOT
, NULL
,
1150 if (status
< 0 && status
!= -ENOSPC
) {
1159 /* Callers don't need to care which bitmap (local alloc or main) to
1160 * use so we figure it out for them, but unfortunately this clutters
1162 static int ocfs2_reserve_clusters_with_limit(struct ocfs2_super
*osb
,
1163 u32 bits_wanted
, u64 max_block
,
1165 struct ocfs2_alloc_context
**ac
)
1167 int status
, ret
= 0;
1170 *ac
= kzalloc(sizeof(struct ocfs2_alloc_context
), GFP_KERNEL
);
1177 (*ac
)->ac_bits_wanted
= bits_wanted
;
1178 (*ac
)->ac_max_block
= max_block
;
1181 if (!(flags
& ALLOC_GROUPS_FROM_GLOBAL
) &&
1182 ocfs2_alloc_should_use_local(osb
, bits_wanted
)) {
1183 status
= ocfs2_reserve_local_alloc_bits(osb
,
1186 if ((status
< 0) && (status
!= -ENOSPC
)) {
1192 if (status
== -ENOSPC
) {
1194 status
= ocfs2_reserve_cluster_bitmap_bits(osb
, *ac
);
1195 /* Retry if there is sufficient space cached in truncate log */
1196 if (status
== -ENOSPC
&& !retried
) {
1198 ocfs2_inode_unlock((*ac
)->ac_inode
, 1);
1199 inode_unlock((*ac
)->ac_inode
);
1201 ret
= ocfs2_try_to_free_truncate_log(osb
, bits_wanted
);
1203 iput((*ac
)->ac_inode
);
1204 (*ac
)->ac_inode
= NULL
;
1211 inode_lock((*ac
)->ac_inode
);
1212 ret
= ocfs2_inode_lock((*ac
)->ac_inode
, NULL
, 1);
1215 inode_unlock((*ac
)->ac_inode
);
1216 iput((*ac
)->ac_inode
);
1217 (*ac
)->ac_inode
= NULL
;
1222 if (status
!= -ENOSPC
)
1230 if ((status
< 0) && *ac
) {
1231 ocfs2_free_alloc_context(*ac
);
1240 int ocfs2_reserve_clusters(struct ocfs2_super
*osb
,
1242 struct ocfs2_alloc_context
**ac
)
1244 return ocfs2_reserve_clusters_with_limit(osb
, bits_wanted
, 0,
1245 ALLOC_NEW_GROUP
, ac
);
1249 * More or less lifted from ext3. I'll leave their description below:
1251 * "For ext3 allocations, we must not reuse any blocks which are
1252 * allocated in the bitmap buffer's "last committed data" copy. This
1253 * prevents deletes from freeing up the page for reuse until we have
1254 * committed the delete transaction.
1256 * If we didn't do this, then deleting something and reallocating it as
1257 * data would allow the old block to be overwritten before the
1258 * transaction committed (because we force data to disk before commit).
1259 * This would lead to corruption if we crashed between overwriting the
1260 * data and committing the delete.
1262 * @@@ We may want to make this allocation behaviour conditional on
1263 * data-writes at some point, and disable it for metadata allocations or
1264 * sync-data inodes."
1266 * Note: OCFS2 already does this differently for metadata vs data
1267 * allocations, as those bitmaps are separate and undo access is never
1268 * called on a metadata group descriptor.
1270 static int ocfs2_test_bg_bit_allocatable(struct buffer_head
*bg_bh
,
1273 struct ocfs2_group_desc
*bg
= (struct ocfs2_group_desc
*) bg_bh
->b_data
;
1276 if (ocfs2_test_bit(nr
, (unsigned long *)bg
->bg_bitmap
))
1279 if (!buffer_jbd(bg_bh
))
1282 jbd_lock_bh_state(bg_bh
);
1283 bg
= (struct ocfs2_group_desc
*) bh2jh(bg_bh
)->b_committed_data
;
1285 ret
= !ocfs2_test_bit(nr
, (unsigned long *)bg
->bg_bitmap
);
1288 jbd_unlock_bh_state(bg_bh
);
1293 static int ocfs2_block_group_find_clear_bits(struct ocfs2_super
*osb
,
1294 struct buffer_head
*bg_bh
,
1295 unsigned int bits_wanted
,
1296 unsigned int total_bits
,
1297 struct ocfs2_suballoc_result
*res
)
1300 u16 best_offset
, best_size
;
1301 int offset
, start
, found
, status
= 0;
1302 struct ocfs2_group_desc
*bg
= (struct ocfs2_group_desc
*) bg_bh
->b_data
;
1304 /* Callers got this descriptor from
1305 * ocfs2_read_group_descriptor(). Any corruption is a code bug. */
1306 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg
));
1308 found
= start
= best_offset
= best_size
= 0;
1309 bitmap
= bg
->bg_bitmap
;
1311 while((offset
= ocfs2_find_next_zero_bit(bitmap
, total_bits
, start
)) != -1) {
1312 if (offset
== total_bits
)
1315 if (!ocfs2_test_bg_bit_allocatable(bg_bh
, offset
)) {
1316 /* We found a zero, but we can't use it as it
1317 * hasn't been put to disk yet! */
1320 } else if (offset
== start
) {
1321 /* we found a zero */
1323 /* move start to the next bit to test */
1326 /* got a zero after some ones */
1330 if (found
> best_size
) {
1332 best_offset
= start
- found
;
1334 /* we got everything we needed */
1335 if (found
== bits_wanted
) {
1336 /* mlog(0, "Found it all!\n"); */
1342 res
->sr_bit_offset
= best_offset
;
1343 res
->sr_bits
= best_size
;
1346 /* No error log here -- see the comment above
1347 * ocfs2_test_bg_bit_allocatable */
1353 int ocfs2_block_group_set_bits(handle_t
*handle
,
1354 struct inode
*alloc_inode
,
1355 struct ocfs2_group_desc
*bg
,
1356 struct buffer_head
*group_bh
,
1357 unsigned int bit_off
,
1358 unsigned int num_bits
)
1361 void *bitmap
= bg
->bg_bitmap
;
1362 int journal_type
= OCFS2_JOURNAL_ACCESS_WRITE
;
1364 /* All callers get the descriptor via
1365 * ocfs2_read_group_descriptor(). Any corruption is a code bug. */
1366 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg
));
1367 BUG_ON(le16_to_cpu(bg
->bg_free_bits_count
) < num_bits
);
1369 trace_ocfs2_block_group_set_bits(bit_off
, num_bits
);
1371 if (ocfs2_is_cluster_bitmap(alloc_inode
))
1372 journal_type
= OCFS2_JOURNAL_ACCESS_UNDO
;
1374 status
= ocfs2_journal_access_gd(handle
,
1375 INODE_CACHE(alloc_inode
),
1383 le16_add_cpu(&bg
->bg_free_bits_count
, -num_bits
);
1384 if (le16_to_cpu(bg
->bg_free_bits_count
) > le16_to_cpu(bg
->bg_bits
)) {
1385 return ocfs2_error(alloc_inode
->i_sb
, "Group descriptor # %llu has bit count %u but claims %u are freed. num_bits %d\n",
1386 (unsigned long long)le64_to_cpu(bg
->bg_blkno
),
1387 le16_to_cpu(bg
->bg_bits
),
1388 le16_to_cpu(bg
->bg_free_bits_count
),
1392 ocfs2_set_bit(bit_off
++, bitmap
);
1394 ocfs2_journal_dirty(handle
, group_bh
);
1400 /* find the one with the most empty bits */
1401 static inline u16
ocfs2_find_victim_chain(struct ocfs2_chain_list
*cl
)
1405 BUG_ON(!cl
->cl_next_free_rec
);
1408 while (curr
< le16_to_cpu(cl
->cl_next_free_rec
)) {
1409 if (le32_to_cpu(cl
->cl_recs
[curr
].c_free
) >
1410 le32_to_cpu(cl
->cl_recs
[best
].c_free
))
1415 BUG_ON(best
>= le16_to_cpu(cl
->cl_next_free_rec
));
1419 static int ocfs2_relink_block_group(handle_t
*handle
,
1420 struct inode
*alloc_inode
,
1421 struct buffer_head
*fe_bh
,
1422 struct buffer_head
*bg_bh
,
1423 struct buffer_head
*prev_bg_bh
,
1427 /* there is a really tiny chance the journal calls could fail,
1428 * but we wouldn't want inconsistent blocks in *any* case. */
1429 u64 bg_ptr
, prev_bg_ptr
;
1430 struct ocfs2_dinode
*fe
= (struct ocfs2_dinode
*) fe_bh
->b_data
;
1431 struct ocfs2_group_desc
*bg
= (struct ocfs2_group_desc
*) bg_bh
->b_data
;
1432 struct ocfs2_group_desc
*prev_bg
= (struct ocfs2_group_desc
*) prev_bg_bh
->b_data
;
1434 /* The caller got these descriptors from
1435 * ocfs2_read_group_descriptor(). Any corruption is a code bug. */
1436 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg
));
1437 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(prev_bg
));
1439 trace_ocfs2_relink_block_group(
1440 (unsigned long long)le64_to_cpu(fe
->i_blkno
), chain
,
1441 (unsigned long long)le64_to_cpu(bg
->bg_blkno
),
1442 (unsigned long long)le64_to_cpu(prev_bg
->bg_blkno
));
1444 bg_ptr
= le64_to_cpu(bg
->bg_next_group
);
1445 prev_bg_ptr
= le64_to_cpu(prev_bg
->bg_next_group
);
1447 status
= ocfs2_journal_access_gd(handle
, INODE_CACHE(alloc_inode
),
1449 OCFS2_JOURNAL_ACCESS_WRITE
);
1453 prev_bg
->bg_next_group
= bg
->bg_next_group
;
1454 ocfs2_journal_dirty(handle
, prev_bg_bh
);
1456 status
= ocfs2_journal_access_gd(handle
, INODE_CACHE(alloc_inode
),
1457 bg_bh
, OCFS2_JOURNAL_ACCESS_WRITE
);
1459 goto out_rollback_prev_bg
;
1461 bg
->bg_next_group
= fe
->id2
.i_chain
.cl_recs
[chain
].c_blkno
;
1462 ocfs2_journal_dirty(handle
, bg_bh
);
1464 status
= ocfs2_journal_access_di(handle
, INODE_CACHE(alloc_inode
),
1465 fe_bh
, OCFS2_JOURNAL_ACCESS_WRITE
);
1467 goto out_rollback_bg
;
1469 fe
->id2
.i_chain
.cl_recs
[chain
].c_blkno
= bg
->bg_blkno
;
1470 ocfs2_journal_dirty(handle
, fe_bh
);
1478 bg
->bg_next_group
= cpu_to_le64(bg_ptr
);
1479 out_rollback_prev_bg
:
1480 prev_bg
->bg_next_group
= cpu_to_le64(prev_bg_ptr
);
1484 static inline int ocfs2_block_group_reasonably_empty(struct ocfs2_group_desc
*bg
,
1487 return le16_to_cpu(bg
->bg_free_bits_count
) > wanted
;
1490 /* return 0 on success, -ENOSPC to keep searching and any other < 0
1491 * value on error. */
1492 static int ocfs2_cluster_group_search(struct inode
*inode
,
1493 struct buffer_head
*group_bh
,
1494 u32 bits_wanted
, u32 min_bits
,
1496 struct ocfs2_suballoc_result
*res
)
1498 int search
= -ENOSPC
;
1501 struct ocfs2_group_desc
*gd
= (struct ocfs2_group_desc
*) group_bh
->b_data
;
1502 struct ocfs2_super
*osb
= OCFS2_SB(inode
->i_sb
);
1503 unsigned int max_bits
, gd_cluster_off
;
1505 BUG_ON(!ocfs2_is_cluster_bitmap(inode
));
1507 if (gd
->bg_free_bits_count
) {
1508 max_bits
= le16_to_cpu(gd
->bg_bits
);
1510 /* Tail groups in cluster bitmaps which aren't cpg
1511 * aligned are prone to partial extension by a failed
1512 * fs resize. If the file system resize never got to
1513 * update the dinode cluster count, then we don't want
1514 * to trust any clusters past it, regardless of what
1515 * the group descriptor says. */
1516 gd_cluster_off
= ocfs2_blocks_to_clusters(inode
->i_sb
,
1517 le64_to_cpu(gd
->bg_blkno
));
1518 if ((gd_cluster_off
+ max_bits
) >
1519 OCFS2_I(inode
)->ip_clusters
) {
1520 max_bits
= OCFS2_I(inode
)->ip_clusters
- gd_cluster_off
;
1521 trace_ocfs2_cluster_group_search_wrong_max_bits(
1522 (unsigned long long)le64_to_cpu(gd
->bg_blkno
),
1523 le16_to_cpu(gd
->bg_bits
),
1524 OCFS2_I(inode
)->ip_clusters
, max_bits
);
1527 ret
= ocfs2_block_group_find_clear_bits(OCFS2_SB(inode
->i_sb
),
1528 group_bh
, bits_wanted
,
1534 blkoff
= ocfs2_clusters_to_blocks(inode
->i_sb
,
1536 res
->sr_bit_offset
+
1538 trace_ocfs2_cluster_group_search_max_block(
1539 (unsigned long long)blkoff
,
1540 (unsigned long long)max_block
);
1541 if (blkoff
> max_block
)
1545 /* ocfs2_block_group_find_clear_bits() might
1546 * return success, but we still want to return
1547 * -ENOSPC unless it found the minimum number
1549 if (min_bits
<= res
->sr_bits
)
1550 search
= 0; /* success */
1551 else if (res
->sr_bits
) {
1553 * Don't show bits which we'll be returning
1554 * for allocation to the local alloc bitmap.
1556 ocfs2_local_alloc_seen_free_bits(osb
, res
->sr_bits
);
1563 static int ocfs2_block_group_search(struct inode
*inode
,
1564 struct buffer_head
*group_bh
,
1565 u32 bits_wanted
, u32 min_bits
,
1567 struct ocfs2_suballoc_result
*res
)
1571 struct ocfs2_group_desc
*bg
= (struct ocfs2_group_desc
*) group_bh
->b_data
;
1573 BUG_ON(min_bits
!= 1);
1574 BUG_ON(ocfs2_is_cluster_bitmap(inode
));
1576 if (bg
->bg_free_bits_count
) {
1577 ret
= ocfs2_block_group_find_clear_bits(OCFS2_SB(inode
->i_sb
),
1578 group_bh
, bits_wanted
,
1579 le16_to_cpu(bg
->bg_bits
),
1581 if (!ret
&& max_block
) {
1582 blkoff
= le64_to_cpu(bg
->bg_blkno
) +
1583 res
->sr_bit_offset
+ res
->sr_bits
;
1584 trace_ocfs2_block_group_search_max_block(
1585 (unsigned long long)blkoff
,
1586 (unsigned long long)max_block
);
1587 if (blkoff
> max_block
)
1595 int ocfs2_alloc_dinode_update_counts(struct inode
*inode
,
1597 struct buffer_head
*di_bh
,
1603 struct ocfs2_dinode
*di
= (struct ocfs2_dinode
*) di_bh
->b_data
;
1604 struct ocfs2_chain_list
*cl
= (struct ocfs2_chain_list
*) &di
->id2
.i_chain
;
1606 ret
= ocfs2_journal_access_di(handle
, INODE_CACHE(inode
), di_bh
,
1607 OCFS2_JOURNAL_ACCESS_WRITE
);
1613 tmp_used
= le32_to_cpu(di
->id1
.bitmap1
.i_used
);
1614 di
->id1
.bitmap1
.i_used
= cpu_to_le32(num_bits
+ tmp_used
);
1615 le32_add_cpu(&cl
->cl_recs
[chain
].c_free
, -num_bits
);
1616 ocfs2_journal_dirty(handle
, di_bh
);
1622 void ocfs2_rollback_alloc_dinode_counts(struct inode
*inode
,
1623 struct buffer_head
*di_bh
,
1628 struct ocfs2_dinode
*di
= (struct ocfs2_dinode
*) di_bh
->b_data
;
1629 struct ocfs2_chain_list
*cl
;
1631 cl
= (struct ocfs2_chain_list
*)&di
->id2
.i_chain
;
1632 tmp_used
= le32_to_cpu(di
->id1
.bitmap1
.i_used
);
1633 di
->id1
.bitmap1
.i_used
= cpu_to_le32(tmp_used
- num_bits
);
1634 le32_add_cpu(&cl
->cl_recs
[chain
].c_free
, num_bits
);
1637 static int ocfs2_bg_discontig_fix_by_rec(struct ocfs2_suballoc_result
*res
,
1638 struct ocfs2_extent_rec
*rec
,
1639 struct ocfs2_chain_list
*cl
)
1641 unsigned int bpc
= le16_to_cpu(cl
->cl_bpc
);
1642 unsigned int bitoff
= le32_to_cpu(rec
->e_cpos
) * bpc
;
1643 unsigned int bitcount
= le16_to_cpu(rec
->e_leaf_clusters
) * bpc
;
1645 if (res
->sr_bit_offset
< bitoff
)
1647 if (res
->sr_bit_offset
>= (bitoff
+ bitcount
))
1649 res
->sr_blkno
= le64_to_cpu(rec
->e_blkno
) +
1650 (res
->sr_bit_offset
- bitoff
);
1651 if ((res
->sr_bit_offset
+ res
->sr_bits
) > (bitoff
+ bitcount
))
1652 res
->sr_bits
= (bitoff
+ bitcount
) - res
->sr_bit_offset
;
1656 static void ocfs2_bg_discontig_fix_result(struct ocfs2_alloc_context
*ac
,
1657 struct ocfs2_group_desc
*bg
,
1658 struct ocfs2_suballoc_result
*res
)
1661 u64 bg_blkno
= res
->sr_bg_blkno
; /* Save off */
1662 struct ocfs2_extent_rec
*rec
;
1663 struct ocfs2_dinode
*di
= (struct ocfs2_dinode
*)ac
->ac_bh
->b_data
;
1664 struct ocfs2_chain_list
*cl
= &di
->id2
.i_chain
;
1666 if (ocfs2_is_cluster_bitmap(ac
->ac_inode
)) {
1671 res
->sr_blkno
= res
->sr_bg_blkno
+ res
->sr_bit_offset
;
1672 res
->sr_bg_blkno
= 0; /* Clear it for contig block groups */
1673 if (!ocfs2_supports_discontig_bg(OCFS2_SB(ac
->ac_inode
->i_sb
)) ||
1674 !bg
->bg_list
.l_next_free_rec
)
1677 for (i
= 0; i
< le16_to_cpu(bg
->bg_list
.l_next_free_rec
); i
++) {
1678 rec
= &bg
->bg_list
.l_recs
[i
];
1679 if (ocfs2_bg_discontig_fix_by_rec(res
, rec
, cl
)) {
1680 res
->sr_bg_blkno
= bg_blkno
; /* Restore */
1686 static int ocfs2_search_one_group(struct ocfs2_alloc_context
*ac
,
1690 struct ocfs2_suballoc_result
*res
,
1694 struct buffer_head
*group_bh
= NULL
;
1695 struct ocfs2_group_desc
*gd
;
1696 struct ocfs2_dinode
*di
= (struct ocfs2_dinode
*)ac
->ac_bh
->b_data
;
1697 struct inode
*alloc_inode
= ac
->ac_inode
;
1699 ret
= ocfs2_read_group_descriptor(alloc_inode
, di
,
1700 res
->sr_bg_blkno
, &group_bh
);
1706 gd
= (struct ocfs2_group_desc
*) group_bh
->b_data
;
1707 ret
= ac
->ac_group_search(alloc_inode
, group_bh
, bits_wanted
, min_bits
,
1708 ac
->ac_max_block
, res
);
1716 ocfs2_bg_discontig_fix_result(ac
, gd
, res
);
1719 * sr_bg_blkno might have been changed by
1720 * ocfs2_bg_discontig_fix_result
1722 res
->sr_bg_stable_blkno
= group_bh
->b_blocknr
;
1724 if (ac
->ac_find_loc_only
)
1727 ret
= ocfs2_alloc_dinode_update_counts(alloc_inode
, handle
, ac
->ac_bh
,
1729 le16_to_cpu(gd
->bg_chain
));
1735 ret
= ocfs2_block_group_set_bits(handle
, alloc_inode
, gd
, group_bh
,
1736 res
->sr_bit_offset
, res
->sr_bits
);
1738 ocfs2_rollback_alloc_dinode_counts(alloc_inode
, ac
->ac_bh
,
1740 le16_to_cpu(gd
->bg_chain
));
1745 *bits_left
= le16_to_cpu(gd
->bg_free_bits_count
);
1753 static int ocfs2_search_chain(struct ocfs2_alloc_context
*ac
,
1757 struct ocfs2_suballoc_result
*res
,
1763 struct inode
*alloc_inode
= ac
->ac_inode
;
1764 struct buffer_head
*group_bh
= NULL
;
1765 struct buffer_head
*prev_group_bh
= NULL
;
1766 struct ocfs2_dinode
*fe
= (struct ocfs2_dinode
*) ac
->ac_bh
->b_data
;
1767 struct ocfs2_chain_list
*cl
= (struct ocfs2_chain_list
*) &fe
->id2
.i_chain
;
1768 struct ocfs2_group_desc
*bg
;
1770 chain
= ac
->ac_chain
;
1771 trace_ocfs2_search_chain_begin(
1772 (unsigned long long)OCFS2_I(alloc_inode
)->ip_blkno
,
1773 bits_wanted
, chain
);
1775 status
= ocfs2_read_group_descriptor(alloc_inode
, fe
,
1776 le64_to_cpu(cl
->cl_recs
[chain
].c_blkno
),
1782 bg
= (struct ocfs2_group_desc
*) group_bh
->b_data
;
1785 /* for now, the chain search is a bit simplistic. We just use
1786 * the 1st group with any empty bits. */
1787 while ((status
= ac
->ac_group_search(alloc_inode
, group_bh
,
1788 bits_wanted
, min_bits
,
1791 if (!bg
->bg_next_group
)
1794 brelse(prev_group_bh
);
1795 prev_group_bh
= NULL
;
1797 next_group
= le64_to_cpu(bg
->bg_next_group
);
1798 prev_group_bh
= group_bh
;
1800 status
= ocfs2_read_group_descriptor(alloc_inode
, fe
,
1801 next_group
, &group_bh
);
1806 bg
= (struct ocfs2_group_desc
*) group_bh
->b_data
;
1809 if (status
!= -ENOSPC
)
1814 trace_ocfs2_search_chain_succ(
1815 (unsigned long long)le64_to_cpu(bg
->bg_blkno
), res
->sr_bits
);
1817 res
->sr_bg_blkno
= le64_to_cpu(bg
->bg_blkno
);
1819 BUG_ON(res
->sr_bits
== 0);
1821 ocfs2_bg_discontig_fix_result(ac
, bg
, res
);
1824 * sr_bg_blkno might have been changed by
1825 * ocfs2_bg_discontig_fix_result
1827 res
->sr_bg_stable_blkno
= group_bh
->b_blocknr
;
1830 * Keep track of previous block descriptor read. When
1831 * we find a target, if we have read more than X
1832 * number of descriptors, and the target is reasonably
1833 * empty, relink him to top of his chain.
1835 * We've read 0 extra blocks and only send one more to
1836 * the transaction, yet the next guy to search has a
1839 * Do this *after* figuring out how many bits we're taking out
1840 * of our target group.
1842 if (!ac
->ac_disable_chain_relink
&&
1844 (ocfs2_block_group_reasonably_empty(bg
, res
->sr_bits
))) {
1845 status
= ocfs2_relink_block_group(handle
, alloc_inode
,
1846 ac
->ac_bh
, group_bh
,
1847 prev_group_bh
, chain
);
1854 if (ac
->ac_find_loc_only
)
1857 status
= ocfs2_alloc_dinode_update_counts(alloc_inode
, handle
,
1858 ac
->ac_bh
, res
->sr_bits
,
1865 status
= ocfs2_block_group_set_bits(handle
,
1872 ocfs2_rollback_alloc_dinode_counts(alloc_inode
,
1873 ac
->ac_bh
, res
->sr_bits
, chain
);
1878 trace_ocfs2_search_chain_end(
1879 (unsigned long long)le64_to_cpu(fe
->i_blkno
),
1883 *bits_left
= le16_to_cpu(bg
->bg_free_bits_count
);
1886 brelse(prev_group_bh
);
1893 /* will give out up to bits_wanted contiguous bits. */
1894 static int ocfs2_claim_suballoc_bits(struct ocfs2_alloc_context
*ac
,
1898 struct ocfs2_suballoc_result
*res
)
1903 u64 hint
= ac
->ac_last_group
;
1904 struct ocfs2_chain_list
*cl
;
1905 struct ocfs2_dinode
*fe
;
1907 BUG_ON(ac
->ac_bits_given
>= ac
->ac_bits_wanted
);
1908 BUG_ON(bits_wanted
> (ac
->ac_bits_wanted
- ac
->ac_bits_given
));
1911 fe
= (struct ocfs2_dinode
*) ac
->ac_bh
->b_data
;
1913 /* The bh was validated by the inode read during
1914 * ocfs2_reserve_suballoc_bits(). Any corruption is a code bug. */
1915 BUG_ON(!OCFS2_IS_VALID_DINODE(fe
));
1917 if (le32_to_cpu(fe
->id1
.bitmap1
.i_used
) >=
1918 le32_to_cpu(fe
->id1
.bitmap1
.i_total
)) {
1919 status
= ocfs2_error(ac
->ac_inode
->i_sb
,
1920 "Chain allocator dinode %llu has %u used bits but only %u total\n",
1921 (unsigned long long)le64_to_cpu(fe
->i_blkno
),
1922 le32_to_cpu(fe
->id1
.bitmap1
.i_used
),
1923 le32_to_cpu(fe
->id1
.bitmap1
.i_total
));
1927 res
->sr_bg_blkno
= hint
;
1928 if (res
->sr_bg_blkno
) {
1929 /* Attempt to short-circuit the usual search mechanism
1930 * by jumping straight to the most recently used
1931 * allocation group. This helps us maintain some
1932 * contiguousness across allocations. */
1933 status
= ocfs2_search_one_group(ac
, handle
, bits_wanted
,
1934 min_bits
, res
, &bits_left
);
1937 if (status
< 0 && status
!= -ENOSPC
) {
1943 cl
= (struct ocfs2_chain_list
*) &fe
->id2
.i_chain
;
1945 victim
= ocfs2_find_victim_chain(cl
);
1946 ac
->ac_chain
= victim
;
1948 status
= ocfs2_search_chain(ac
, handle
, bits_wanted
, min_bits
,
1951 if (ocfs2_is_cluster_bitmap(ac
->ac_inode
))
1952 hint
= res
->sr_bg_blkno
;
1954 hint
= ocfs2_group_from_res(res
);
1957 if (status
< 0 && status
!= -ENOSPC
) {
1962 trace_ocfs2_claim_suballoc_bits(victim
);
1964 /* If we didn't pick a good victim, then just default to
1965 * searching each chain in order. Don't allow chain relinking
1966 * because we only calculate enough journal credits for one
1967 * relink per alloc. */
1968 ac
->ac_disable_chain_relink
= 1;
1969 for (i
= 0; i
< le16_to_cpu(cl
->cl_next_free_rec
); i
++) {
1972 if (!cl
->cl_recs
[i
].c_free
)
1976 status
= ocfs2_search_chain(ac
, handle
, bits_wanted
, min_bits
,
1979 hint
= ocfs2_group_from_res(res
);
1982 if (status
< 0 && status
!= -ENOSPC
) {
1989 if (status
!= -ENOSPC
) {
1990 /* If the next search of this group is not likely to
1991 * yield a suitable extent, then we reset the last
1992 * group hint so as to not waste a disk read */
1993 if (bits_left
< min_bits
)
1994 ac
->ac_last_group
= 0;
1996 ac
->ac_last_group
= hint
;
2005 int ocfs2_claim_metadata(handle_t
*handle
,
2006 struct ocfs2_alloc_context
*ac
,
2009 u16
*suballoc_bit_start
,
2010 unsigned int *num_bits
,
2014 struct ocfs2_suballoc_result res
= { .sr_blkno
= 0, };
2017 BUG_ON(ac
->ac_bits_wanted
< (ac
->ac_bits_given
+ bits_wanted
));
2018 BUG_ON(ac
->ac_which
!= OCFS2_AC_USE_META
);
2020 status
= ocfs2_claim_suballoc_bits(ac
,
2029 atomic_inc(&OCFS2_SB(ac
->ac_inode
->i_sb
)->alloc_stats
.bg_allocs
);
2031 *suballoc_loc
= res
.sr_bg_blkno
;
2032 *suballoc_bit_start
= res
.sr_bit_offset
;
2033 *blkno_start
= res
.sr_blkno
;
2034 ac
->ac_bits_given
+= res
.sr_bits
;
2035 *num_bits
= res
.sr_bits
;
2043 static void ocfs2_init_inode_ac_group(struct inode
*dir
,
2044 struct buffer_head
*parent_di_bh
,
2045 struct ocfs2_alloc_context
*ac
)
2047 struct ocfs2_dinode
*di
= (struct ocfs2_dinode
*)parent_di_bh
->b_data
;
2049 * Try to allocate inodes from some specific group.
2051 * If the parent dir has recorded the last group used in allocation,
2052 * cool, use it. Otherwise if we try to allocate new inode from the
2053 * same slot the parent dir belongs to, use the same chunk.
2055 * We are very careful here to avoid the mistake of setting
2056 * ac_last_group to a group descriptor from a different (unlocked) slot.
2058 if (OCFS2_I(dir
)->ip_last_used_group
&&
2059 OCFS2_I(dir
)->ip_last_used_slot
== ac
->ac_alloc_slot
)
2060 ac
->ac_last_group
= OCFS2_I(dir
)->ip_last_used_group
;
2061 else if (le16_to_cpu(di
->i_suballoc_slot
) == ac
->ac_alloc_slot
) {
2062 if (di
->i_suballoc_loc
)
2063 ac
->ac_last_group
= le64_to_cpu(di
->i_suballoc_loc
);
2065 ac
->ac_last_group
= ocfs2_which_suballoc_group(
2066 le64_to_cpu(di
->i_blkno
),
2067 le16_to_cpu(di
->i_suballoc_bit
));
2071 static inline void ocfs2_save_inode_ac_group(struct inode
*dir
,
2072 struct ocfs2_alloc_context
*ac
)
2074 OCFS2_I(dir
)->ip_last_used_group
= ac
->ac_last_group
;
2075 OCFS2_I(dir
)->ip_last_used_slot
= ac
->ac_alloc_slot
;
2078 int ocfs2_find_new_inode_loc(struct inode
*dir
,
2079 struct buffer_head
*parent_fe_bh
,
2080 struct ocfs2_alloc_context
*ac
,
2084 handle_t
*handle
= NULL
;
2085 struct ocfs2_suballoc_result
*res
;
2088 BUG_ON(ac
->ac_bits_given
!= 0);
2089 BUG_ON(ac
->ac_bits_wanted
!= 1);
2090 BUG_ON(ac
->ac_which
!= OCFS2_AC_USE_INODE
);
2092 res
= kzalloc(sizeof(*res
), GFP_NOFS
);
2099 ocfs2_init_inode_ac_group(dir
, parent_fe_bh
, ac
);
2102 * The handle started here is for chain relink. Alternatively,
2103 * we could just disable relink for these calls.
2105 handle
= ocfs2_start_trans(OCFS2_SB(dir
->i_sb
), OCFS2_SUBALLOC_ALLOC
);
2106 if (IS_ERR(handle
)) {
2107 ret
= PTR_ERR(handle
);
2114 * This will instruct ocfs2_claim_suballoc_bits and
2115 * ocfs2_search_one_group to search but save actual allocation
2118 ac
->ac_find_loc_only
= 1;
2120 ret
= ocfs2_claim_suballoc_bits(ac
, handle
, 1, 1, res
);
2126 ac
->ac_find_loc_priv
= res
;
2127 *fe_blkno
= res
->sr_blkno
;
2128 ocfs2_update_inode_fsync_trans(handle
, dir
, 0);
2131 ocfs2_commit_trans(OCFS2_SB(dir
->i_sb
), handle
);
2139 int ocfs2_claim_new_inode_at_loc(handle_t
*handle
,
2141 struct ocfs2_alloc_context
*ac
,
2148 struct ocfs2_suballoc_result
*res
= ac
->ac_find_loc_priv
;
2149 struct buffer_head
*bg_bh
= NULL
;
2150 struct ocfs2_group_desc
*bg
;
2151 struct ocfs2_dinode
*di
= (struct ocfs2_dinode
*) ac
->ac_bh
->b_data
;
2154 * Since di_blkno is being passed back in, we check for any
2155 * inconsistencies which may have happened between
2156 * calls. These are code bugs as di_blkno is not expected to
2157 * change once returned from ocfs2_find_new_inode_loc()
2159 BUG_ON(res
->sr_blkno
!= di_blkno
);
2161 ret
= ocfs2_read_group_descriptor(ac
->ac_inode
, di
,
2162 res
->sr_bg_stable_blkno
, &bg_bh
);
2168 bg
= (struct ocfs2_group_desc
*) bg_bh
->b_data
;
2169 chain
= le16_to_cpu(bg
->bg_chain
);
2171 ret
= ocfs2_alloc_dinode_update_counts(ac
->ac_inode
, handle
,
2172 ac
->ac_bh
, res
->sr_bits
,
2179 ret
= ocfs2_block_group_set_bits(handle
,
2186 ocfs2_rollback_alloc_dinode_counts(ac
->ac_inode
,
2187 ac
->ac_bh
, res
->sr_bits
, chain
);
2192 trace_ocfs2_claim_new_inode_at_loc((unsigned long long)di_blkno
,
2195 atomic_inc(&OCFS2_SB(ac
->ac_inode
->i_sb
)->alloc_stats
.bg_allocs
);
2197 BUG_ON(res
->sr_bits
!= 1);
2199 *suballoc_loc
= res
->sr_bg_blkno
;
2200 *suballoc_bit
= res
->sr_bit_offset
;
2201 ac
->ac_bits_given
++;
2202 ocfs2_save_inode_ac_group(dir
, ac
);
2210 int ocfs2_claim_new_inode(handle_t
*handle
,
2212 struct buffer_head
*parent_fe_bh
,
2213 struct ocfs2_alloc_context
*ac
,
2219 struct ocfs2_suballoc_result res
;
2222 BUG_ON(ac
->ac_bits_given
!= 0);
2223 BUG_ON(ac
->ac_bits_wanted
!= 1);
2224 BUG_ON(ac
->ac_which
!= OCFS2_AC_USE_INODE
);
2226 ocfs2_init_inode_ac_group(dir
, parent_fe_bh
, ac
);
2228 status
= ocfs2_claim_suballoc_bits(ac
,
2237 atomic_inc(&OCFS2_SB(ac
->ac_inode
->i_sb
)->alloc_stats
.bg_allocs
);
2239 BUG_ON(res
.sr_bits
!= 1);
2241 *suballoc_loc
= res
.sr_bg_blkno
;
2242 *suballoc_bit
= res
.sr_bit_offset
;
2243 *fe_blkno
= res
.sr_blkno
;
2244 ac
->ac_bits_given
++;
2245 ocfs2_save_inode_ac_group(dir
, ac
);
2253 /* translate a group desc. blkno and it's bitmap offset into
2254 * disk cluster offset. */
2255 static inline u32
ocfs2_desc_bitmap_to_cluster_off(struct inode
*inode
,
2259 struct ocfs2_super
*osb
= OCFS2_SB(inode
->i_sb
);
2262 BUG_ON(!ocfs2_is_cluster_bitmap(inode
));
2264 if (bg_blkno
!= osb
->first_cluster_group_blkno
)
2265 cluster
= ocfs2_blocks_to_clusters(inode
->i_sb
, bg_blkno
);
2266 cluster
+= (u32
) bg_bit_off
;
2270 /* given a cluster offset, calculate which block group it belongs to
2271 * and return that block offset. */
2272 u64
ocfs2_which_cluster_group(struct inode
*inode
, u32 cluster
)
2274 struct ocfs2_super
*osb
= OCFS2_SB(inode
->i_sb
);
2277 BUG_ON(!ocfs2_is_cluster_bitmap(inode
));
2279 group_no
= cluster
/ osb
->bitmap_cpg
;
2281 return osb
->first_cluster_group_blkno
;
2282 return ocfs2_clusters_to_blocks(inode
->i_sb
,
2283 group_no
* osb
->bitmap_cpg
);
2286 /* given the block number of a cluster start, calculate which cluster
2287 * group and descriptor bitmap offset that corresponds to. */
2288 static inline void ocfs2_block_to_cluster_group(struct inode
*inode
,
2293 struct ocfs2_super
*osb
= OCFS2_SB(inode
->i_sb
);
2294 u32 data_cluster
= ocfs2_blocks_to_clusters(osb
->sb
, data_blkno
);
2296 BUG_ON(!ocfs2_is_cluster_bitmap(inode
));
2298 *bg_blkno
= ocfs2_which_cluster_group(inode
,
2301 if (*bg_blkno
== osb
->first_cluster_group_blkno
)
2302 *bg_bit_off
= (u16
) data_cluster
;
2304 *bg_bit_off
= (u16
) ocfs2_blocks_to_clusters(osb
->sb
,
2305 data_blkno
- *bg_blkno
);
2309 * min_bits - minimum contiguous chunk from this total allocation we
2310 * can handle. set to what we asked for originally for a full
2311 * contig. allocation, set to '1' to indicate we can deal with extents
2314 int __ocfs2_claim_clusters(handle_t
*handle
,
2315 struct ocfs2_alloc_context
*ac
,
2322 unsigned int bits_wanted
= max_clusters
;
2323 struct ocfs2_suballoc_result res
= { .sr_blkno
= 0, };
2324 struct ocfs2_super
*osb
= OCFS2_SB(ac
->ac_inode
->i_sb
);
2326 BUG_ON(ac
->ac_bits_given
>= ac
->ac_bits_wanted
);
2328 BUG_ON(ac
->ac_which
!= OCFS2_AC_USE_LOCAL
2329 && ac
->ac_which
!= OCFS2_AC_USE_MAIN
);
2331 if (ac
->ac_which
== OCFS2_AC_USE_LOCAL
) {
2332 WARN_ON(min_clusters
> 1);
2334 status
= ocfs2_claim_local_alloc_bits(osb
,
2341 atomic_inc(&osb
->alloc_stats
.local_data
);
2343 if (min_clusters
> (osb
->bitmap_cpg
- 1)) {
2344 /* The only paths asking for contiguousness
2345 * should know about this already. */
2346 mlog(ML_ERROR
, "minimum allocation requested %u exceeds "
2347 "group bitmap size %u!\n", min_clusters
,
2352 /* clamp the current request down to a realistic size. */
2353 if (bits_wanted
> (osb
->bitmap_cpg
- 1))
2354 bits_wanted
= osb
->bitmap_cpg
- 1;
2356 status
= ocfs2_claim_suballoc_bits(ac
,
2362 BUG_ON(res
.sr_blkno
); /* cluster alloc can't set */
2364 ocfs2_desc_bitmap_to_cluster_off(ac
->ac_inode
,
2367 atomic_inc(&osb
->alloc_stats
.bitmap_data
);
2368 *num_clusters
= res
.sr_bits
;
2372 if (status
!= -ENOSPC
)
2377 ac
->ac_bits_given
+= *num_clusters
;
2385 int ocfs2_claim_clusters(handle_t
*handle
,
2386 struct ocfs2_alloc_context
*ac
,
2391 unsigned int bits_wanted
= ac
->ac_bits_wanted
- ac
->ac_bits_given
;
2393 return __ocfs2_claim_clusters(handle
, ac
, min_clusters
,
2394 bits_wanted
, cluster_start
, num_clusters
);
2397 static int ocfs2_block_group_clear_bits(handle_t
*handle
,
2398 struct inode
*alloc_inode
,
2399 struct ocfs2_group_desc
*bg
,
2400 struct buffer_head
*group_bh
,
2401 unsigned int bit_off
,
2402 unsigned int num_bits
,
2403 void (*undo_fn
)(unsigned int bit
,
2404 unsigned long *bmap
))
2408 struct ocfs2_group_desc
*undo_bg
= NULL
;
2410 /* The caller got this descriptor from
2411 * ocfs2_read_group_descriptor(). Any corruption is a code bug. */
2412 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg
));
2414 trace_ocfs2_block_group_clear_bits(bit_off
, num_bits
);
2416 BUG_ON(undo_fn
&& !ocfs2_is_cluster_bitmap(alloc_inode
));
2417 status
= ocfs2_journal_access_gd(handle
, INODE_CACHE(alloc_inode
),
2420 OCFS2_JOURNAL_ACCESS_UNDO
:
2421 OCFS2_JOURNAL_ACCESS_WRITE
);
2428 jbd_lock_bh_state(group_bh
);
2429 undo_bg
= (struct ocfs2_group_desc
*)
2430 bh2jh(group_bh
)->b_committed_data
;
2436 ocfs2_clear_bit((bit_off
+ tmp
),
2437 (unsigned long *) bg
->bg_bitmap
);
2439 undo_fn(bit_off
+ tmp
,
2440 (unsigned long *) undo_bg
->bg_bitmap
);
2442 le16_add_cpu(&bg
->bg_free_bits_count
, num_bits
);
2443 if (le16_to_cpu(bg
->bg_free_bits_count
) > le16_to_cpu(bg
->bg_bits
)) {
2444 return ocfs2_error(alloc_inode
->i_sb
, "Group descriptor # %llu has bit count %u but claims %u are freed. num_bits %d\n",
2445 (unsigned long long)le64_to_cpu(bg
->bg_blkno
),
2446 le16_to_cpu(bg
->bg_bits
),
2447 le16_to_cpu(bg
->bg_free_bits_count
),
2452 jbd_unlock_bh_state(group_bh
);
2454 ocfs2_journal_dirty(handle
, group_bh
);
2460 * expects the suballoc inode to already be locked.
2462 static int _ocfs2_free_suballoc_bits(handle_t
*handle
,
2463 struct inode
*alloc_inode
,
2464 struct buffer_head
*alloc_bh
,
2465 unsigned int start_bit
,
2468 void (*undo_fn
)(unsigned int bit
,
2469 unsigned long *bitmap
))
2473 struct ocfs2_dinode
*fe
= (struct ocfs2_dinode
*) alloc_bh
->b_data
;
2474 struct ocfs2_chain_list
*cl
= &fe
->id2
.i_chain
;
2475 struct buffer_head
*group_bh
= NULL
;
2476 struct ocfs2_group_desc
*group
;
2478 /* The alloc_bh comes from ocfs2_free_dinode() or
2479 * ocfs2_free_clusters(). The callers have all locked the
2480 * allocator and gotten alloc_bh from the lock call. This
2481 * validates the dinode buffer. Any corruption that has happened
2483 BUG_ON(!OCFS2_IS_VALID_DINODE(fe
));
2484 BUG_ON((count
+ start_bit
) > ocfs2_bits_per_group(cl
));
2486 trace_ocfs2_free_suballoc_bits(
2487 (unsigned long long)OCFS2_I(alloc_inode
)->ip_blkno
,
2488 (unsigned long long)bg_blkno
,
2491 status
= ocfs2_read_group_descriptor(alloc_inode
, fe
, bg_blkno
,
2497 group
= (struct ocfs2_group_desc
*) group_bh
->b_data
;
2499 BUG_ON((count
+ start_bit
) > le16_to_cpu(group
->bg_bits
));
2501 status
= ocfs2_block_group_clear_bits(handle
, alloc_inode
,
2503 start_bit
, count
, undo_fn
);
2509 status
= ocfs2_journal_access_di(handle
, INODE_CACHE(alloc_inode
),
2510 alloc_bh
, OCFS2_JOURNAL_ACCESS_WRITE
);
2513 ocfs2_block_group_set_bits(handle
, alloc_inode
, group
, group_bh
,
2518 le32_add_cpu(&cl
->cl_recs
[le16_to_cpu(group
->bg_chain
)].c_free
,
2520 tmp_used
= le32_to_cpu(fe
->id1
.bitmap1
.i_used
);
2521 fe
->id1
.bitmap1
.i_used
= cpu_to_le32(tmp_used
- count
);
2522 ocfs2_journal_dirty(handle
, alloc_bh
);
2532 int ocfs2_free_suballoc_bits(handle_t
*handle
,
2533 struct inode
*alloc_inode
,
2534 struct buffer_head
*alloc_bh
,
2535 unsigned int start_bit
,
2539 return _ocfs2_free_suballoc_bits(handle
, alloc_inode
, alloc_bh
,
2540 start_bit
, bg_blkno
, count
, NULL
);
2543 int ocfs2_free_dinode(handle_t
*handle
,
2544 struct inode
*inode_alloc_inode
,
2545 struct buffer_head
*inode_alloc_bh
,
2546 struct ocfs2_dinode
*di
)
2548 u64 blk
= le64_to_cpu(di
->i_blkno
);
2549 u16 bit
= le16_to_cpu(di
->i_suballoc_bit
);
2550 u64 bg_blkno
= ocfs2_which_suballoc_group(blk
, bit
);
2552 if (di
->i_suballoc_loc
)
2553 bg_blkno
= le64_to_cpu(di
->i_suballoc_loc
);
2554 return ocfs2_free_suballoc_bits(handle
, inode_alloc_inode
,
2555 inode_alloc_bh
, bit
, bg_blkno
, 1);
2558 static int _ocfs2_free_clusters(handle_t
*handle
,
2559 struct inode
*bitmap_inode
,
2560 struct buffer_head
*bitmap_bh
,
2562 unsigned int num_clusters
,
2563 void (*undo_fn
)(unsigned int bit
,
2564 unsigned long *bitmap
))
2569 struct ocfs2_dinode
*fe
;
2571 /* You can't ever have a contiguous set of clusters
2572 * bigger than a block group bitmap so we never have to worry
2573 * about looping on them.
2574 * This is expensive. We can safely remove once this stuff has
2575 * gotten tested really well. */
2576 BUG_ON(start_blk
!= ocfs2_clusters_to_blocks(bitmap_inode
->i_sb
, ocfs2_blocks_to_clusters(bitmap_inode
->i_sb
, start_blk
)));
2578 fe
= (struct ocfs2_dinode
*) bitmap_bh
->b_data
;
2580 ocfs2_block_to_cluster_group(bitmap_inode
, start_blk
, &bg_blkno
,
2583 trace_ocfs2_free_clusters((unsigned long long)bg_blkno
,
2584 (unsigned long long)start_blk
,
2585 bg_start_bit
, num_clusters
);
2587 status
= _ocfs2_free_suballoc_bits(handle
, bitmap_inode
, bitmap_bh
,
2588 bg_start_bit
, bg_blkno
,
2589 num_clusters
, undo_fn
);
2595 ocfs2_local_alloc_seen_free_bits(OCFS2_SB(bitmap_inode
->i_sb
),
2604 int ocfs2_free_clusters(handle_t
*handle
,
2605 struct inode
*bitmap_inode
,
2606 struct buffer_head
*bitmap_bh
,
2608 unsigned int num_clusters
)
2610 return _ocfs2_free_clusters(handle
, bitmap_inode
, bitmap_bh
,
2611 start_blk
, num_clusters
,
2616 * Give never-used clusters back to the global bitmap. We don't need
2617 * to protect these bits in the undo buffer.
2619 int ocfs2_release_clusters(handle_t
*handle
,
2620 struct inode
*bitmap_inode
,
2621 struct buffer_head
*bitmap_bh
,
2623 unsigned int num_clusters
)
2625 return _ocfs2_free_clusters(handle
, bitmap_inode
, bitmap_bh
,
2626 start_blk
, num_clusters
,
2630 static inline void ocfs2_debug_bg(struct ocfs2_group_desc
*bg
)
2632 printk("Block Group:\n");
2633 printk("bg_signature: %s\n", bg
->bg_signature
);
2634 printk("bg_size: %u\n", bg
->bg_size
);
2635 printk("bg_bits: %u\n", bg
->bg_bits
);
2636 printk("bg_free_bits_count: %u\n", bg
->bg_free_bits_count
);
2637 printk("bg_chain: %u\n", bg
->bg_chain
);
2638 printk("bg_generation: %u\n", le32_to_cpu(bg
->bg_generation
));
2639 printk("bg_next_group: %llu\n",
2640 (unsigned long long)bg
->bg_next_group
);
2641 printk("bg_parent_dinode: %llu\n",
2642 (unsigned long long)bg
->bg_parent_dinode
);
2643 printk("bg_blkno: %llu\n",
2644 (unsigned long long)bg
->bg_blkno
);
2647 static inline void ocfs2_debug_suballoc_inode(struct ocfs2_dinode
*fe
)
2651 printk("Suballoc Inode %llu:\n", (unsigned long long)fe
->i_blkno
);
2652 printk("i_signature: %s\n", fe
->i_signature
);
2653 printk("i_size: %llu\n",
2654 (unsigned long long)fe
->i_size
);
2655 printk("i_clusters: %u\n", fe
->i_clusters
);
2656 printk("i_generation: %u\n",
2657 le32_to_cpu(fe
->i_generation
));
2658 printk("id1.bitmap1.i_used: %u\n",
2659 le32_to_cpu(fe
->id1
.bitmap1
.i_used
));
2660 printk("id1.bitmap1.i_total: %u\n",
2661 le32_to_cpu(fe
->id1
.bitmap1
.i_total
));
2662 printk("id2.i_chain.cl_cpg: %u\n", fe
->id2
.i_chain
.cl_cpg
);
2663 printk("id2.i_chain.cl_bpc: %u\n", fe
->id2
.i_chain
.cl_bpc
);
2664 printk("id2.i_chain.cl_count: %u\n", fe
->id2
.i_chain
.cl_count
);
2665 printk("id2.i_chain.cl_next_free_rec: %u\n",
2666 fe
->id2
.i_chain
.cl_next_free_rec
);
2667 for(i
= 0; i
< fe
->id2
.i_chain
.cl_next_free_rec
; i
++) {
2668 printk("fe->id2.i_chain.cl_recs[%d].c_free: %u\n", i
,
2669 fe
->id2
.i_chain
.cl_recs
[i
].c_free
);
2670 printk("fe->id2.i_chain.cl_recs[%d].c_total: %u\n", i
,
2671 fe
->id2
.i_chain
.cl_recs
[i
].c_total
);
2672 printk("fe->id2.i_chain.cl_recs[%d].c_blkno: %llu\n", i
,
2673 (unsigned long long)fe
->id2
.i_chain
.cl_recs
[i
].c_blkno
);
2678 * For a given allocation, determine which allocators will need to be
2679 * accessed, and lock them, reserving the appropriate number of bits.
2681 * Sparse file systems call this from ocfs2_write_begin_nolock()
2682 * and ocfs2_allocate_unwritten_extents().
2684 * File systems which don't support holes call this from
2685 * ocfs2_extend_allocation().
2687 int ocfs2_lock_allocators(struct inode
*inode
,
2688 struct ocfs2_extent_tree
*et
,
2689 u32 clusters_to_add
, u32 extents_to_split
,
2690 struct ocfs2_alloc_context
**data_ac
,
2691 struct ocfs2_alloc_context
**meta_ac
)
2693 int ret
= 0, num_free_extents
;
2694 unsigned int max_recs_needed
= clusters_to_add
+ 2 * extents_to_split
;
2695 struct ocfs2_super
*osb
= OCFS2_SB(inode
->i_sb
);
2701 BUG_ON(clusters_to_add
!= 0 && data_ac
== NULL
);
2703 num_free_extents
= ocfs2_num_free_extents(osb
, et
);
2704 if (num_free_extents
< 0) {
2705 ret
= num_free_extents
;
2711 * Sparse allocation file systems need to be more conservative
2712 * with reserving room for expansion - the actual allocation
2713 * happens while we've got a journal handle open so re-taking
2714 * a cluster lock (because we ran out of room for another
2715 * extent) will violate ordering rules.
2717 * Most of the time we'll only be seeing this 1 cluster at a time
2720 * Always lock for any unwritten extents - we might want to
2721 * add blocks during a split.
2723 if (!num_free_extents
||
2724 (ocfs2_sparse_alloc(osb
) && num_free_extents
< max_recs_needed
)) {
2725 ret
= ocfs2_reserve_new_metadata(osb
, et
->et_root_el
, meta_ac
);
2733 if (clusters_to_add
== 0)
2736 ret
= ocfs2_reserve_clusters(osb
, clusters_to_add
, data_ac
);
2746 ocfs2_free_alloc_context(*meta_ac
);
2751 * We cannot have an error and a non null *data_ac.
2759 * Read the inode specified by blkno to get suballoc_slot and
2762 static int ocfs2_get_suballoc_slot_bit(struct ocfs2_super
*osb
, u64 blkno
,
2763 u16
*suballoc_slot
, u64
*group_blkno
,
2767 struct buffer_head
*inode_bh
= NULL
;
2768 struct ocfs2_dinode
*inode_fe
;
2770 trace_ocfs2_get_suballoc_slot_bit((unsigned long long)blkno
);
2772 /* dirty read disk */
2773 status
= ocfs2_read_blocks_sync(osb
, blkno
, 1, &inode_bh
);
2775 mlog(ML_ERROR
, "read block %llu failed %d\n",
2776 (unsigned long long)blkno
, status
);
2780 inode_fe
= (struct ocfs2_dinode
*) inode_bh
->b_data
;
2781 if (!OCFS2_IS_VALID_DINODE(inode_fe
)) {
2782 mlog(ML_ERROR
, "invalid inode %llu requested\n",
2783 (unsigned long long)blkno
);
2788 if (le16_to_cpu(inode_fe
->i_suballoc_slot
) != (u16
)OCFS2_INVALID_SLOT
&&
2789 (u32
)le16_to_cpu(inode_fe
->i_suballoc_slot
) > osb
->max_slots
- 1) {
2790 mlog(ML_ERROR
, "inode %llu has invalid suballoc slot %u\n",
2791 (unsigned long long)blkno
,
2792 (u32
)le16_to_cpu(inode_fe
->i_suballoc_slot
));
2798 *suballoc_slot
= le16_to_cpu(inode_fe
->i_suballoc_slot
);
2800 *suballoc_bit
= le16_to_cpu(inode_fe
->i_suballoc_bit
);
2802 *group_blkno
= le64_to_cpu(inode_fe
->i_suballoc_loc
);
2813 * test whether bit is SET in allocator bitmap or not. on success, 0
2814 * is returned and *res is 1 for SET; 0 otherwise. when fails, errno
2815 * is returned and *res is meaningless. Call this after you have
2816 * cluster locked against suballoc, or you may get a result based on
2817 * non-up2date contents
2819 static int ocfs2_test_suballoc_bit(struct ocfs2_super
*osb
,
2820 struct inode
*suballoc
,
2821 struct buffer_head
*alloc_bh
,
2822 u64 group_blkno
, u64 blkno
,
2825 struct ocfs2_dinode
*alloc_di
;
2826 struct ocfs2_group_desc
*group
;
2827 struct buffer_head
*group_bh
= NULL
;
2831 trace_ocfs2_test_suballoc_bit((unsigned long long)blkno
,
2834 alloc_di
= (struct ocfs2_dinode
*)alloc_bh
->b_data
;
2835 if ((bit
+ 1) > ocfs2_bits_per_group(&alloc_di
->id2
.i_chain
)) {
2836 mlog(ML_ERROR
, "suballoc bit %u out of range of %u\n",
2838 ocfs2_bits_per_group(&alloc_di
->id2
.i_chain
));
2843 bg_blkno
= group_blkno
? group_blkno
:
2844 ocfs2_which_suballoc_group(blkno
, bit
);
2845 status
= ocfs2_read_group_descriptor(suballoc
, alloc_di
, bg_blkno
,
2848 mlog(ML_ERROR
, "read group %llu failed %d\n",
2849 (unsigned long long)bg_blkno
, status
);
2853 group
= (struct ocfs2_group_desc
*) group_bh
->b_data
;
2854 *res
= ocfs2_test_bit(bit
, (unsigned long *)group
->bg_bitmap
);
2865 * Test if the bit representing this inode (blkno) is set in the
2868 * On success, 0 is returned and *res is 1 for SET; 0 otherwise.
2870 * In the event of failure, a negative value is returned and *res is
2873 * Callers must make sure to hold nfs_sync_lock to prevent
2874 * ocfs2_delete_inode() on another node from accessing the same
2875 * suballocator concurrently.
2877 int ocfs2_test_inode_bit(struct ocfs2_super
*osb
, u64 blkno
, int *res
)
2880 u64 group_blkno
= 0;
2881 u16 suballoc_bit
= 0, suballoc_slot
= 0;
2882 struct inode
*inode_alloc_inode
;
2883 struct buffer_head
*alloc_bh
= NULL
;
2885 trace_ocfs2_test_inode_bit((unsigned long long)blkno
);
2887 status
= ocfs2_get_suballoc_slot_bit(osb
, blkno
, &suballoc_slot
,
2888 &group_blkno
, &suballoc_bit
);
2890 mlog(ML_ERROR
, "get alloc slot and bit failed %d\n", status
);
2895 ocfs2_get_system_file_inode(osb
, INODE_ALLOC_SYSTEM_INODE
,
2897 if (!inode_alloc_inode
) {
2898 /* the error code could be inaccurate, but we are not able to
2899 * get the correct one. */
2901 mlog(ML_ERROR
, "unable to get alloc inode in slot %u\n",
2902 (u32
)suballoc_slot
);
2906 inode_lock(inode_alloc_inode
);
2907 status
= ocfs2_inode_lock(inode_alloc_inode
, &alloc_bh
, 0);
2909 inode_unlock(inode_alloc_inode
);
2910 iput(inode_alloc_inode
);
2911 mlog(ML_ERROR
, "lock on alloc inode on slot %u failed %d\n",
2912 (u32
)suballoc_slot
, status
);
2916 status
= ocfs2_test_suballoc_bit(osb
, inode_alloc_inode
, alloc_bh
,
2917 group_blkno
, blkno
, suballoc_bit
, res
);
2919 mlog(ML_ERROR
, "test suballoc bit failed %d\n", status
);
2921 ocfs2_inode_unlock(inode_alloc_inode
, 0);
2922 inode_unlock(inode_alloc_inode
);
2924 iput(inode_alloc_inode
);