1 /* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
6 * Creates, reads, walks and deletes directory-nodes
8 * Copyright (C) 2002, 2004 Oracle. All rights reserved.
10 * Portions of this code from linux/fs/ext3/dir.c
12 * Copyright (C) 1992, 1993, 1994, 1995
13 * Remy Card (card@masi.ibp.fr)
14 * Laboratoire MASI - Institut Blaise pascal
15 * Universite Pierre et Marie Curie (Paris VI)
19 * linux/fs/minix/dir.c
21 * Copyright (C) 1991, 1992 Linux Torvalds
23 * This program is free software; you can redistribute it and/or
24 * modify it under the terms of the GNU General Public
25 * License as published by the Free Software Foundation; either
26 * version 2 of the License, or (at your option) any later version.
28 * This program is distributed in the hope that it will be useful,
29 * but WITHOUT ANY WARRANTY; without even the implied warranty of
30 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
31 * General Public License for more details.
33 * You should have received a copy of the GNU General Public
34 * License along with this program; if not, write to the
35 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
36 * Boston, MA 021110-1307, USA.
40 #include <linux/types.h>
41 #include <linux/slab.h>
42 #include <linux/highmem.h>
43 #include <linux/quotaops.h>
45 #define MLOG_MASK_PREFIX ML_NAMEI
46 #include <cluster/masklog.h>
53 #include "extent_map.h"
62 #include "buffer_head_io.h"
64 #define NAMEI_RA_CHUNKS 2
65 #define NAMEI_RA_BLOCKS 4
66 #define NAMEI_RA_SIZE (NAMEI_RA_CHUNKS * NAMEI_RA_BLOCKS)
67 #define NAMEI_RA_INDEX(c,b) (((c) * NAMEI_RA_BLOCKS) + (b))
69 static unsigned char ocfs2_filetype_table
[] = {
70 DT_UNKNOWN
, DT_REG
, DT_DIR
, DT_CHR
, DT_BLK
, DT_FIFO
, DT_SOCK
, DT_LNK
73 static int ocfs2_extend_dir(struct ocfs2_super
*osb
,
75 struct buffer_head
*parent_fe_bh
,
76 unsigned int blocks_wanted
,
77 struct buffer_head
**new_de_bh
);
78 static int ocfs2_do_extend_dir(struct super_block
*sb
,
81 struct buffer_head
*parent_fe_bh
,
82 struct ocfs2_alloc_context
*data_ac
,
83 struct ocfs2_alloc_context
*meta_ac
,
84 struct buffer_head
**new_bh
);
87 * bh passed here can be an inode block or a dir data block, depending
88 * on the inode inline data flag.
90 static int ocfs2_check_dir_entry(struct inode
* dir
,
91 struct ocfs2_dir_entry
* de
,
92 struct buffer_head
* bh
,
95 const char *error_msg
= NULL
;
96 const int rlen
= le16_to_cpu(de
->rec_len
);
98 if (rlen
< OCFS2_DIR_REC_LEN(1))
99 error_msg
= "rec_len is smaller than minimal";
100 else if (rlen
% 4 != 0)
101 error_msg
= "rec_len % 4 != 0";
102 else if (rlen
< OCFS2_DIR_REC_LEN(de
->name_len
))
103 error_msg
= "rec_len is too small for name_len";
104 else if (((char *) de
- bh
->b_data
) + rlen
> dir
->i_sb
->s_blocksize
)
105 error_msg
= "directory entry across blocks";
107 if (error_msg
!= NULL
)
108 mlog(ML_ERROR
, "bad entry in directory #%llu: %s - "
109 "offset=%lu, inode=%llu, rec_len=%d, name_len=%d\n",
110 (unsigned long long)OCFS2_I(dir
)->ip_blkno
, error_msg
,
111 offset
, (unsigned long long)le64_to_cpu(de
->inode
), rlen
,
113 return error_msg
== NULL
? 1 : 0;
116 static inline int ocfs2_match(int len
,
117 const char * const name
,
118 struct ocfs2_dir_entry
*de
)
120 if (len
!= de
->name_len
)
124 return !memcmp(name
, de
->name
, len
);
128 * Returns 0 if not found, -1 on failure, and 1 on success
130 static int inline ocfs2_search_dirblock(struct buffer_head
*bh
,
132 const char *name
, int namelen
,
133 unsigned long offset
,
136 struct ocfs2_dir_entry
**res_dir
)
138 struct ocfs2_dir_entry
*de
;
139 char *dlimit
, *de_buf
;
146 dlimit
= de_buf
+ bytes
;
148 while (de_buf
< dlimit
) {
149 /* this code is executed quadratically often */
150 /* do minimal checking `by hand' */
152 de
= (struct ocfs2_dir_entry
*) de_buf
;
154 if (de_buf
+ namelen
<= dlimit
&&
155 ocfs2_match(namelen
, name
, de
)) {
156 /* found a match - just to be sure, do a full check */
157 if (!ocfs2_check_dir_entry(dir
, de
, bh
, offset
)) {
166 /* prevent looping on a bad block */
167 de_len
= le16_to_cpu(de
->rec_len
);
182 static struct buffer_head
*ocfs2_find_entry_id(const char *name
,
185 struct ocfs2_dir_entry
**res_dir
)
188 struct buffer_head
*di_bh
= NULL
;
189 struct ocfs2_dinode
*di
;
190 struct ocfs2_inline_data
*data
;
192 ret
= ocfs2_read_inode_block(dir
, &di_bh
);
198 di
= (struct ocfs2_dinode
*)di_bh
->b_data
;
199 data
= &di
->id2
.i_data
;
201 found
= ocfs2_search_dirblock(di_bh
, dir
, name
, namelen
, 0,
202 data
->id_data
, i_size_read(dir
), res_dir
);
211 static int ocfs2_validate_dir_block(struct super_block
*sb
,
212 struct buffer_head
*bh
)
215 * Nothing yet. We don't validate dirents here, that's handled
216 * in-place when the code walks them.
218 mlog(0, "Validating dirblock %llu\n",
219 (unsigned long long)bh
->b_blocknr
);
225 * This function forces all errors to -EIO for consistency with its
226 * predecessor, ocfs2_bread(). We haven't audited what returning the
227 * real error codes would do to callers. We log the real codes with
228 * mlog_errno() before we squash them.
230 static int ocfs2_read_dir_block(struct inode
*inode
, u64 v_block
,
231 struct buffer_head
**bh
, int flags
)
234 struct buffer_head
*tmp
= *bh
;
236 rc
= ocfs2_read_virt_blocks(inode
, v_block
, 1, &tmp
, flags
,
237 ocfs2_validate_dir_block
);
241 /* If ocfs2_read_virt_blocks() got us a new bh, pass it up. */
245 return rc
? -EIO
: 0;
248 static struct buffer_head
*ocfs2_find_entry_el(const char *name
, int namelen
,
250 struct ocfs2_dir_entry
**res_dir
)
252 struct super_block
*sb
;
253 struct buffer_head
*bh_use
[NAMEI_RA_SIZE
];
254 struct buffer_head
*bh
, *ret
= NULL
;
255 unsigned long start
, block
, b
;
256 int ra_max
= 0; /* Number of bh's in the readahead
258 int ra_ptr
= 0; /* Current index into readahead
267 nblocks
= i_size_read(dir
) >> sb
->s_blocksize_bits
;
268 start
= OCFS2_I(dir
)->ip_dir_start_lookup
;
269 if (start
>= nblocks
)
276 * We deal with the read-ahead logic here.
278 if (ra_ptr
>= ra_max
) {
279 /* Refill the readahead buffer */
282 for (ra_max
= 0; ra_max
< NAMEI_RA_SIZE
; ra_max
++) {
284 * Terminate if we reach the end of the
285 * directory and must wrap, or if our
286 * search has finished at this block.
288 if (b
>= nblocks
|| (num
&& block
== start
)) {
289 bh_use
[ra_max
] = NULL
;
295 err
= ocfs2_read_dir_block(dir
, b
++, &bh
,
300 if ((bh
= bh_use
[ra_ptr
++]) == NULL
)
302 if (ocfs2_read_dir_block(dir
, block
, &bh
, 0)) {
303 /* read error, skip block & hope for the best.
304 * ocfs2_read_dir_block() has released the bh. */
305 ocfs2_error(dir
->i_sb
, "reading directory %llu, "
307 (unsigned long long)OCFS2_I(dir
)->ip_blkno
,
311 i
= ocfs2_search_dirblock(bh
, dir
, name
, namelen
,
312 block
<< sb
->s_blocksize_bits
,
313 bh
->b_data
, sb
->s_blocksize
,
316 OCFS2_I(dir
)->ip_dir_start_lookup
= block
;
318 goto cleanup_and_exit
;
322 goto cleanup_and_exit
;
325 if (++block
>= nblocks
)
327 } while (block
!= start
);
330 * If the directory has grown while we were searching, then
331 * search the last part of the directory before giving up.
334 nblocks
= i_size_read(dir
) >> sb
->s_blocksize_bits
;
335 if (block
< nblocks
) {
341 /* Clean up the read-ahead blocks */
342 for (; ra_ptr
< ra_max
; ra_ptr
++)
343 brelse(bh_use
[ra_ptr
]);
350 * Try to find an entry of the provided name within 'dir'.
352 * If nothing was found, NULL is returned. Otherwise, a buffer_head
353 * and pointer to the dir entry are passed back.
355 * Caller can NOT assume anything about the contents of the
356 * buffer_head - it is passed back only so that it can be passed into
357 * any one of the manipulation functions (add entry, delete entry,
358 * etc). As an example, bh in the extent directory case is a data
359 * block, in the inline-data case it actually points to an inode.
361 struct buffer_head
*ocfs2_find_entry(const char *name
, int namelen
,
363 struct ocfs2_dir_entry
**res_dir
)
367 if (OCFS2_I(dir
)->ip_dyn_features
& OCFS2_INLINE_DATA_FL
)
368 return ocfs2_find_entry_id(name
, namelen
, dir
, res_dir
);
370 return ocfs2_find_entry_el(name
, namelen
, dir
, res_dir
);
374 * Update inode number and type of a previously found directory entry.
376 int ocfs2_update_entry(struct inode
*dir
, handle_t
*handle
,
377 struct buffer_head
*de_bh
, struct ocfs2_dir_entry
*de
,
378 struct inode
*new_entry_inode
)
381 ocfs2_journal_access_func access
= ocfs2_journal_access_db
;
384 * The same code works fine for both inline-data and extent
385 * based directories, so no need to split this up. The only
386 * difference is the journal_access function.
389 if (OCFS2_I(dir
)->ip_dyn_features
& OCFS2_INLINE_DATA_FL
)
390 access
= ocfs2_journal_access_di
;
392 ret
= access(handle
, dir
, de_bh
, OCFS2_JOURNAL_ACCESS_WRITE
);
398 de
->inode
= cpu_to_le64(OCFS2_I(new_entry_inode
)->ip_blkno
);
399 ocfs2_set_de_type(de
, new_entry_inode
->i_mode
);
401 ocfs2_journal_dirty(handle
, de_bh
);
407 static int __ocfs2_delete_entry(handle_t
*handle
, struct inode
*dir
,
408 struct ocfs2_dir_entry
*de_del
,
409 struct buffer_head
*bh
, char *first_de
,
412 struct ocfs2_dir_entry
*de
, *pde
;
413 int i
, status
= -ENOENT
;
414 ocfs2_journal_access_func access
= ocfs2_journal_access_db
;
416 mlog_entry("(0x%p, 0x%p, 0x%p, 0x%p)\n", handle
, dir
, de_del
, bh
);
418 if (OCFS2_I(dir
)->ip_dyn_features
& OCFS2_INLINE_DATA_FL
)
419 access
= ocfs2_journal_access_di
;
423 de
= (struct ocfs2_dir_entry
*) first_de
;
425 if (!ocfs2_check_dir_entry(dir
, de
, bh
, i
)) {
431 status
= access(handle
, dir
, bh
,
432 OCFS2_JOURNAL_ACCESS_WRITE
);
439 le16_add_cpu(&pde
->rec_len
,
440 le16_to_cpu(de
->rec_len
));
444 status
= ocfs2_journal_dirty(handle
, bh
);
447 i
+= le16_to_cpu(de
->rec_len
);
449 de
= (struct ocfs2_dir_entry
*)((char *)de
+ le16_to_cpu(de
->rec_len
));
456 static inline int ocfs2_delete_entry_id(handle_t
*handle
,
458 struct ocfs2_dir_entry
*de_del
,
459 struct buffer_head
*bh
)
462 struct buffer_head
*di_bh
= NULL
;
463 struct ocfs2_dinode
*di
;
464 struct ocfs2_inline_data
*data
;
466 ret
= ocfs2_read_inode_block(dir
, &di_bh
);
472 di
= (struct ocfs2_dinode
*)di_bh
->b_data
;
473 data
= &di
->id2
.i_data
;
475 ret
= __ocfs2_delete_entry(handle
, dir
, de_del
, bh
, data
->id_data
,
483 static inline int ocfs2_delete_entry_el(handle_t
*handle
,
485 struct ocfs2_dir_entry
*de_del
,
486 struct buffer_head
*bh
)
488 return __ocfs2_delete_entry(handle
, dir
, de_del
, bh
, bh
->b_data
,
493 * ocfs2_delete_entry deletes a directory entry by merging it with the
496 int ocfs2_delete_entry(handle_t
*handle
,
498 struct ocfs2_dir_entry
*de_del
,
499 struct buffer_head
*bh
)
501 if (OCFS2_I(dir
)->ip_dyn_features
& OCFS2_INLINE_DATA_FL
)
502 return ocfs2_delete_entry_id(handle
, dir
, de_del
, bh
);
504 return ocfs2_delete_entry_el(handle
, dir
, de_del
, bh
);
508 * Check whether 'de' has enough room to hold an entry of
509 * 'new_rec_len' bytes.
511 static inline int ocfs2_dirent_would_fit(struct ocfs2_dir_entry
*de
,
512 unsigned int new_rec_len
)
514 unsigned int de_really_used
;
516 /* Check whether this is an empty record with enough space */
517 if (le64_to_cpu(de
->inode
) == 0 &&
518 le16_to_cpu(de
->rec_len
) >= new_rec_len
)
522 * Record might have free space at the end which we can
525 de_really_used
= OCFS2_DIR_REC_LEN(de
->name_len
);
526 if (le16_to_cpu(de
->rec_len
) >= (de_really_used
+ new_rec_len
))
532 /* we don't always have a dentry for what we want to add, so people
533 * like orphan dir can call this instead.
535 * If you pass me insert_bh, I'll skip the search of the other dir
536 * blocks and put the record in there.
538 int __ocfs2_add_entry(handle_t
*handle
,
540 const char *name
, int namelen
,
541 struct inode
*inode
, u64 blkno
,
542 struct buffer_head
*parent_fe_bh
,
543 struct buffer_head
*insert_bh
)
545 unsigned long offset
;
546 unsigned short rec_len
;
547 struct ocfs2_dir_entry
*de
, *de1
;
548 struct ocfs2_dinode
*di
= (struct ocfs2_dinode
*)parent_fe_bh
->b_data
;
549 struct super_block
*sb
= dir
->i_sb
;
551 unsigned int size
= sb
->s_blocksize
;
552 char *data_start
= insert_bh
->b_data
;
559 if (OCFS2_I(dir
)->ip_dyn_features
& OCFS2_INLINE_DATA_FL
) {
560 data_start
= di
->id2
.i_data
.id_data
;
561 size
= i_size_read(dir
);
563 BUG_ON(insert_bh
!= parent_fe_bh
);
566 rec_len
= OCFS2_DIR_REC_LEN(namelen
);
568 de
= (struct ocfs2_dir_entry
*) data_start
;
570 BUG_ON((char *)de
>= (size
+ data_start
));
572 /* These checks should've already been passed by the
573 * prepare function, but I guess we can leave them
575 if (!ocfs2_check_dir_entry(dir
, de
, insert_bh
, offset
)) {
579 if (ocfs2_match(namelen
, name
, de
)) {
584 if (ocfs2_dirent_would_fit(de
, rec_len
)) {
585 dir
->i_mtime
= dir
->i_ctime
= CURRENT_TIME
;
586 retval
= ocfs2_mark_inode_dirty(handle
, dir
, parent_fe_bh
);
592 if (insert_bh
== parent_fe_bh
)
593 status
= ocfs2_journal_access_di(handle
, dir
,
595 OCFS2_JOURNAL_ACCESS_WRITE
);
597 status
= ocfs2_journal_access_db(handle
, dir
,
599 OCFS2_JOURNAL_ACCESS_WRITE
);
600 /* By now the buffer is marked for journaling */
601 offset
+= le16_to_cpu(de
->rec_len
);
602 if (le64_to_cpu(de
->inode
)) {
603 de1
= (struct ocfs2_dir_entry
*)((char *) de
+
604 OCFS2_DIR_REC_LEN(de
->name_len
));
606 cpu_to_le16(le16_to_cpu(de
->rec_len
) -
607 OCFS2_DIR_REC_LEN(de
->name_len
));
608 de
->rec_len
= cpu_to_le16(OCFS2_DIR_REC_LEN(de
->name_len
));
611 de
->file_type
= OCFS2_FT_UNKNOWN
;
613 de
->inode
= cpu_to_le64(blkno
);
614 ocfs2_set_de_type(de
, inode
->i_mode
);
617 de
->name_len
= namelen
;
618 memcpy(de
->name
, name
, namelen
);
621 status
= ocfs2_journal_dirty(handle
, insert_bh
);
625 offset
+= le16_to_cpu(de
->rec_len
);
626 de
= (struct ocfs2_dir_entry
*) ((char *) de
+ le16_to_cpu(de
->rec_len
));
629 /* when you think about it, the assert above should prevent us
630 * from ever getting here. */
638 static int ocfs2_dir_foreach_blk_id(struct inode
*inode
,
640 loff_t
*f_pos
, void *priv
,
641 filldir_t filldir
, int *filldir_err
)
643 int ret
, i
, filldir_ret
;
644 unsigned long offset
= *f_pos
;
645 struct buffer_head
*di_bh
= NULL
;
646 struct ocfs2_dinode
*di
;
647 struct ocfs2_inline_data
*data
;
648 struct ocfs2_dir_entry
*de
;
650 ret
= ocfs2_read_inode_block(inode
, &di_bh
);
652 mlog(ML_ERROR
, "Unable to read inode block for dir %llu\n",
653 (unsigned long long)OCFS2_I(inode
)->ip_blkno
);
657 di
= (struct ocfs2_dinode
*)di_bh
->b_data
;
658 data
= &di
->id2
.i_data
;
660 while (*f_pos
< i_size_read(inode
)) {
662 /* If the dir block has changed since the last call to
663 * readdir(2), then we might be pointing to an invalid
664 * dirent right now. Scan from the start of the block
666 if (*f_version
!= inode
->i_version
) {
667 for (i
= 0; i
< i_size_read(inode
) && i
< offset
; ) {
668 de
= (struct ocfs2_dir_entry
*)
670 /* It's too expensive to do a full
671 * dirent test each time round this
672 * loop, but we do have to test at
673 * least that it is non-zero. A
674 * failure will be detected in the
675 * dirent test below. */
676 if (le16_to_cpu(de
->rec_len
) <
677 OCFS2_DIR_REC_LEN(1))
679 i
+= le16_to_cpu(de
->rec_len
);
682 *f_version
= inode
->i_version
;
685 de
= (struct ocfs2_dir_entry
*) (data
->id_data
+ *f_pos
);
686 if (!ocfs2_check_dir_entry(inode
, de
, di_bh
, *f_pos
)) {
687 /* On error, skip the f_pos to the end. */
688 *f_pos
= i_size_read(inode
);
691 offset
+= le16_to_cpu(de
->rec_len
);
692 if (le64_to_cpu(de
->inode
)) {
693 /* We might block in the next section
694 * if the data destination is
695 * currently swapped out. So, use a
696 * version stamp to detect whether or
697 * not the directory has been modified
698 * during the copy operation.
700 u64 version
= *f_version
;
701 unsigned char d_type
= DT_UNKNOWN
;
703 if (de
->file_type
< OCFS2_FT_MAX
)
704 d_type
= ocfs2_filetype_table
[de
->file_type
];
706 filldir_ret
= filldir(priv
, de
->name
,
709 le64_to_cpu(de
->inode
),
713 *filldir_err
= filldir_ret
;
716 if (version
!= *f_version
)
719 *f_pos
+= le16_to_cpu(de
->rec_len
);
728 static int ocfs2_dir_foreach_blk_el(struct inode
*inode
,
730 loff_t
*f_pos
, void *priv
,
731 filldir_t filldir
, int *filldir_err
)
734 unsigned long offset
, blk
, last_ra_blk
= 0;
736 struct buffer_head
* bh
, * tmp
;
737 struct ocfs2_dir_entry
* de
;
738 struct super_block
* sb
= inode
->i_sb
;
739 unsigned int ra_sectors
= 16;
744 offset
= (*f_pos
) & (sb
->s_blocksize
- 1);
746 while (!error
&& !stored
&& *f_pos
< i_size_read(inode
)) {
747 blk
= (*f_pos
) >> sb
->s_blocksize_bits
;
748 if (ocfs2_read_dir_block(inode
, blk
, &bh
, 0)) {
749 /* Skip the corrupt dirblock and keep trying */
750 *f_pos
+= sb
->s_blocksize
- offset
;
754 /* The idea here is to begin with 8k read-ahead and to stay
755 * 4k ahead of our current position.
757 * TODO: Use the pagecache for this. We just need to
758 * make sure it's cluster-safe... */
760 || (((last_ra_blk
- blk
) << 9) <= (ra_sectors
/ 2))) {
761 for (i
= ra_sectors
>> (sb
->s_blocksize_bits
- 9);
764 if (!ocfs2_read_dir_block(inode
, ++blk
, &tmp
,
773 /* If the dir block has changed since the last call to
774 * readdir(2), then we might be pointing to an invalid
775 * dirent right now. Scan from the start of the block
777 if (*f_version
!= inode
->i_version
) {
778 for (i
= 0; i
< sb
->s_blocksize
&& i
< offset
; ) {
779 de
= (struct ocfs2_dir_entry
*) (bh
->b_data
+ i
);
780 /* It's too expensive to do a full
781 * dirent test each time round this
782 * loop, but we do have to test at
783 * least that it is non-zero. A
784 * failure will be detected in the
785 * dirent test below. */
786 if (le16_to_cpu(de
->rec_len
) <
787 OCFS2_DIR_REC_LEN(1))
789 i
+= le16_to_cpu(de
->rec_len
);
792 *f_pos
= ((*f_pos
) & ~(sb
->s_blocksize
- 1))
794 *f_version
= inode
->i_version
;
797 while (!error
&& *f_pos
< i_size_read(inode
)
798 && offset
< sb
->s_blocksize
) {
799 de
= (struct ocfs2_dir_entry
*) (bh
->b_data
+ offset
);
800 if (!ocfs2_check_dir_entry(inode
, de
, bh
, offset
)) {
801 /* On error, skip the f_pos to the
803 *f_pos
= ((*f_pos
) | (sb
->s_blocksize
- 1)) + 1;
807 offset
+= le16_to_cpu(de
->rec_len
);
808 if (le64_to_cpu(de
->inode
)) {
809 /* We might block in the next section
810 * if the data destination is
811 * currently swapped out. So, use a
812 * version stamp to detect whether or
813 * not the directory has been modified
814 * during the copy operation.
816 unsigned long version
= *f_version
;
817 unsigned char d_type
= DT_UNKNOWN
;
819 if (de
->file_type
< OCFS2_FT_MAX
)
820 d_type
= ocfs2_filetype_table
[de
->file_type
];
821 error
= filldir(priv
, de
->name
,
824 le64_to_cpu(de
->inode
),
828 *filldir_err
= error
;
831 if (version
!= *f_version
)
835 *f_pos
+= le16_to_cpu(de
->rec_len
);
847 static int ocfs2_dir_foreach_blk(struct inode
*inode
, u64
*f_version
,
848 loff_t
*f_pos
, void *priv
, filldir_t filldir
,
851 if (OCFS2_I(inode
)->ip_dyn_features
& OCFS2_INLINE_DATA_FL
)
852 return ocfs2_dir_foreach_blk_id(inode
, f_version
, f_pos
, priv
,
853 filldir
, filldir_err
);
855 return ocfs2_dir_foreach_blk_el(inode
, f_version
, f_pos
, priv
, filldir
,
860 * This is intended to be called from inside other kernel functions,
861 * so we fake some arguments.
863 int ocfs2_dir_foreach(struct inode
*inode
, loff_t
*f_pos
, void *priv
,
866 int ret
= 0, filldir_err
= 0;
867 u64 version
= inode
->i_version
;
869 while (*f_pos
< i_size_read(inode
)) {
870 ret
= ocfs2_dir_foreach_blk(inode
, &version
, f_pos
, priv
,
871 filldir
, &filldir_err
);
872 if (ret
|| filldir_err
)
886 int ocfs2_readdir(struct file
* filp
, void * dirent
, filldir_t filldir
)
889 struct inode
*inode
= filp
->f_path
.dentry
->d_inode
;
892 mlog_entry("dirino=%llu\n",
893 (unsigned long long)OCFS2_I(inode
)->ip_blkno
);
895 error
= ocfs2_inode_lock_atime(inode
, filp
->f_vfsmnt
, &lock_level
);
896 if (lock_level
&& error
>= 0) {
897 /* We release EX lock which used to update atime
898 * and get PR lock again to reduce contention
899 * on commonly accessed directories. */
900 ocfs2_inode_unlock(inode
, 1);
902 error
= ocfs2_inode_lock(inode
, NULL
, 0);
905 if (error
!= -ENOENT
)
907 /* we haven't got any yet, so propagate the error. */
911 error
= ocfs2_dir_foreach_blk(inode
, &filp
->f_version
, &filp
->f_pos
,
912 dirent
, filldir
, NULL
);
914 ocfs2_inode_unlock(inode
, lock_level
);
923 * NOTE: this should always be called with parent dir i_mutex taken.
925 int ocfs2_find_files_on_disk(const char *name
,
929 struct buffer_head
**dirent_bh
,
930 struct ocfs2_dir_entry
**dirent
)
932 int status
= -ENOENT
;
934 mlog_entry("(name=%.*s, blkno=%p, inode=%p, dirent_bh=%p, dirent=%p)\n",
935 namelen
, name
, blkno
, inode
, dirent_bh
, dirent
);
937 *dirent_bh
= ocfs2_find_entry(name
, namelen
, inode
, dirent
);
938 if (!*dirent_bh
|| !*dirent
) {
943 *blkno
= le64_to_cpu((*dirent
)->inode
);
958 * Convenience function for callers which just want the block number
959 * mapped to a name and don't require the full dirent info, etc.
961 int ocfs2_lookup_ino_from_name(struct inode
*dir
, const char *name
,
962 int namelen
, u64
*blkno
)
965 struct buffer_head
*bh
= NULL
;
966 struct ocfs2_dir_entry
*dirent
= NULL
;
968 ret
= ocfs2_find_files_on_disk(name
, namelen
, blkno
, dir
, &bh
, &dirent
);
974 /* Check for a name within a directory.
976 * Return 0 if the name does not exist
977 * Return -EEXIST if the directory contains the name
979 * Callers should have i_mutex + a cluster lock on dir
981 int ocfs2_check_dir_for_entry(struct inode
*dir
,
986 struct buffer_head
*dirent_bh
= NULL
;
987 struct ocfs2_dir_entry
*dirent
= NULL
;
989 mlog_entry("dir %llu, name '%.*s'\n",
990 (unsigned long long)OCFS2_I(dir
)->ip_blkno
, namelen
, name
);
993 dirent_bh
= ocfs2_find_entry(name
, namelen
, dir
, &dirent
);
1005 struct ocfs2_empty_dir_priv
{
1007 unsigned seen_dot_dot
;
1008 unsigned seen_other
;
1010 static int ocfs2_empty_dir_filldir(void *priv
, const char *name
, int name_len
,
1011 loff_t pos
, u64 ino
, unsigned type
)
1013 struct ocfs2_empty_dir_priv
*p
= priv
;
1016 * Check the positions of "." and ".." records to be sure
1017 * they're in the correct place.
1019 if (name_len
== 1 && !strncmp(".", name
, 1) && pos
== 0) {
1024 if (name_len
== 2 && !strncmp("..", name
, 2) &&
1025 pos
== OCFS2_DIR_REC_LEN(1)) {
1026 p
->seen_dot_dot
= 1;
1034 * routine to check that the specified directory is empty (for rmdir)
1036 * Returns 1 if dir is empty, zero otherwise.
1038 int ocfs2_empty_dir(struct inode
*inode
)
1042 struct ocfs2_empty_dir_priv priv
;
1044 memset(&priv
, 0, sizeof(priv
));
1046 ret
= ocfs2_dir_foreach(inode
, &start
, &priv
, ocfs2_empty_dir_filldir
);
1050 if (!priv
.seen_dot
|| !priv
.seen_dot_dot
) {
1051 mlog(ML_ERROR
, "bad directory (dir #%llu) - no `.' or `..'\n",
1052 (unsigned long long)OCFS2_I(inode
)->ip_blkno
);
1054 * XXX: Is it really safe to allow an unlink to continue?
1059 return !priv
.seen_other
;
1062 static void ocfs2_fill_initial_dirents(struct inode
*inode
,
1063 struct inode
*parent
,
1064 char *start
, unsigned int size
)
1066 struct ocfs2_dir_entry
*de
= (struct ocfs2_dir_entry
*)start
;
1068 de
->inode
= cpu_to_le64(OCFS2_I(inode
)->ip_blkno
);
1071 cpu_to_le16(OCFS2_DIR_REC_LEN(de
->name_len
));
1072 strcpy(de
->name
, ".");
1073 ocfs2_set_de_type(de
, S_IFDIR
);
1075 de
= (struct ocfs2_dir_entry
*) ((char *)de
+ le16_to_cpu(de
->rec_len
));
1076 de
->inode
= cpu_to_le64(OCFS2_I(parent
)->ip_blkno
);
1077 de
->rec_len
= cpu_to_le16(size
- OCFS2_DIR_REC_LEN(1));
1079 strcpy(de
->name
, "..");
1080 ocfs2_set_de_type(de
, S_IFDIR
);
1084 * This works together with code in ocfs2_mknod_locked() which sets
1085 * the inline-data flag and initializes the inline-data section.
1087 static int ocfs2_fill_new_dir_id(struct ocfs2_super
*osb
,
1089 struct inode
*parent
,
1090 struct inode
*inode
,
1091 struct buffer_head
*di_bh
)
1094 struct ocfs2_dinode
*di
= (struct ocfs2_dinode
*)di_bh
->b_data
;
1095 struct ocfs2_inline_data
*data
= &di
->id2
.i_data
;
1096 unsigned int size
= le16_to_cpu(data
->id_count
);
1098 ret
= ocfs2_journal_access_di(handle
, inode
, di_bh
,
1099 OCFS2_JOURNAL_ACCESS_WRITE
);
1105 ocfs2_fill_initial_dirents(inode
, parent
, data
->id_data
, size
);
1107 ocfs2_journal_dirty(handle
, di_bh
);
1113 i_size_write(inode
, size
);
1115 inode
->i_blocks
= ocfs2_inode_sector_count(inode
);
1117 ret
= ocfs2_mark_inode_dirty(handle
, inode
, di_bh
);
1125 static int ocfs2_fill_new_dir_el(struct ocfs2_super
*osb
,
1127 struct inode
*parent
,
1128 struct inode
*inode
,
1129 struct buffer_head
*fe_bh
,
1130 struct ocfs2_alloc_context
*data_ac
)
1133 struct buffer_head
*new_bh
= NULL
;
1137 status
= ocfs2_do_extend_dir(osb
->sb
, handle
, inode
, fe_bh
,
1138 data_ac
, NULL
, &new_bh
);
1144 ocfs2_set_new_buffer_uptodate(inode
, new_bh
);
1146 status
= ocfs2_journal_access_db(handle
, inode
, new_bh
,
1147 OCFS2_JOURNAL_ACCESS_CREATE
);
1152 memset(new_bh
->b_data
, 0, osb
->sb
->s_blocksize
);
1154 ocfs2_fill_initial_dirents(inode
, parent
, new_bh
->b_data
,
1155 osb
->sb
->s_blocksize
);
1157 status
= ocfs2_journal_dirty(handle
, new_bh
);
1163 i_size_write(inode
, inode
->i_sb
->s_blocksize
);
1165 inode
->i_blocks
= ocfs2_inode_sector_count(inode
);
1166 status
= ocfs2_mark_inode_dirty(handle
, inode
, fe_bh
);
1180 int ocfs2_fill_new_dir(struct ocfs2_super
*osb
,
1182 struct inode
*parent
,
1183 struct inode
*inode
,
1184 struct buffer_head
*fe_bh
,
1185 struct ocfs2_alloc_context
*data_ac
)
1187 BUG_ON(!ocfs2_supports_inline_data(osb
) && data_ac
== NULL
);
1189 if (OCFS2_I(inode
)->ip_dyn_features
& OCFS2_INLINE_DATA_FL
)
1190 return ocfs2_fill_new_dir_id(osb
, handle
, parent
, inode
, fe_bh
);
1192 return ocfs2_fill_new_dir_el(osb
, handle
, parent
, inode
, fe_bh
,
1196 static void ocfs2_expand_last_dirent(char *start
, unsigned int old_size
,
1197 unsigned int new_size
)
1199 struct ocfs2_dir_entry
*de
;
1200 struct ocfs2_dir_entry
*prev_de
;
1201 char *de_buf
, *limit
;
1202 unsigned int bytes
= new_size
- old_size
;
1204 limit
= start
+ old_size
;
1206 de
= (struct ocfs2_dir_entry
*)de_buf
;
1209 de_buf
+= le16_to_cpu(de
->rec_len
);
1210 de
= (struct ocfs2_dir_entry
*)de_buf
;
1211 } while (de_buf
< limit
);
1213 le16_add_cpu(&prev_de
->rec_len
, bytes
);
1217 * We allocate enough clusters to fulfill "blocks_wanted", but set
1218 * i_size to exactly one block. Ocfs2_extend_dir() will handle the
1219 * rest automatically for us.
1221 * *first_block_bh is a pointer to the 1st data block allocated to the
1224 static int ocfs2_expand_inline_dir(struct inode
*dir
, struct buffer_head
*di_bh
,
1225 unsigned int blocks_wanted
,
1226 struct buffer_head
**first_block_bh
)
1228 u32 alloc
, bit_off
, len
;
1229 struct super_block
*sb
= dir
->i_sb
;
1230 int ret
, credits
= ocfs2_inline_to_extents_credits(sb
);
1231 u64 blkno
, bytes
= blocks_wanted
<< sb
->s_blocksize_bits
;
1232 struct ocfs2_super
*osb
= OCFS2_SB(dir
->i_sb
);
1233 struct ocfs2_inode_info
*oi
= OCFS2_I(dir
);
1234 struct ocfs2_alloc_context
*data_ac
;
1235 struct buffer_head
*dirdata_bh
= NULL
;
1236 struct ocfs2_dinode
*di
= (struct ocfs2_dinode
*)di_bh
->b_data
;
1238 struct ocfs2_extent_tree et
;
1241 ocfs2_init_dinode_extent_tree(&et
, dir
, di_bh
);
1243 alloc
= ocfs2_clusters_for_bytes(sb
, bytes
);
1246 * We should never need more than 2 clusters for this -
1247 * maximum dirent size is far less than one block. In fact,
1248 * the only time we'd need more than one cluster is if
1249 * blocksize == clustersize and the dirent won't fit in the
1250 * extra space that the expansion to a single block gives. As
1251 * of today, that only happens on 4k/4k file systems.
1255 ret
= ocfs2_reserve_clusters(osb
, alloc
, &data_ac
);
1261 down_write(&oi
->ip_alloc_sem
);
1264 * Prepare for worst case allocation scenario of two separate
1268 credits
+= OCFS2_SUBALLOC_ALLOC
;
1270 handle
= ocfs2_start_trans(osb
, credits
);
1271 if (IS_ERR(handle
)) {
1272 ret
= PTR_ERR(handle
);
1277 if (vfs_dq_alloc_space_nodirty(dir
,
1278 ocfs2_clusters_to_bytes(osb
->sb
, alloc
))) {
1284 * Try to claim as many clusters as the bitmap can give though
1285 * if we only get one now, that's enough to continue. The rest
1286 * will be claimed after the conversion to extents.
1288 ret
= ocfs2_claim_clusters(osb
, handle
, data_ac
, 1, &bit_off
, &len
);
1295 * Operations are carefully ordered so that we set up the new
1296 * data block first. The conversion from inline data to
1299 blkno
= ocfs2_clusters_to_blocks(dir
->i_sb
, bit_off
);
1300 dirdata_bh
= sb_getblk(sb
, blkno
);
1307 ocfs2_set_new_buffer_uptodate(dir
, dirdata_bh
);
1309 ret
= ocfs2_journal_access_db(handle
, dir
, dirdata_bh
,
1310 OCFS2_JOURNAL_ACCESS_CREATE
);
1316 memcpy(dirdata_bh
->b_data
, di
->id2
.i_data
.id_data
, i_size_read(dir
));
1317 memset(dirdata_bh
->b_data
+ i_size_read(dir
), 0,
1318 sb
->s_blocksize
- i_size_read(dir
));
1319 ocfs2_expand_last_dirent(dirdata_bh
->b_data
, i_size_read(dir
),
1322 ret
= ocfs2_journal_dirty(handle
, dirdata_bh
);
1329 * Set extent, i_size, etc on the directory. After this, the
1330 * inode should contain the same exact dirents as before and
1331 * be fully accessible from system calls.
1333 * We let the later dirent insert modify c/mtime - to the user
1334 * the data hasn't changed.
1336 ret
= ocfs2_journal_access_di(handle
, dir
, di_bh
,
1337 OCFS2_JOURNAL_ACCESS_CREATE
);
1343 spin_lock(&oi
->ip_lock
);
1344 oi
->ip_dyn_features
&= ~OCFS2_INLINE_DATA_FL
;
1345 di
->i_dyn_features
= cpu_to_le16(oi
->ip_dyn_features
);
1346 spin_unlock(&oi
->ip_lock
);
1348 ocfs2_dinode_new_extent_list(dir
, di
);
1350 i_size_write(dir
, sb
->s_blocksize
);
1351 dir
->i_mtime
= dir
->i_ctime
= CURRENT_TIME
;
1353 di
->i_size
= cpu_to_le64(sb
->s_blocksize
);
1354 di
->i_ctime
= di
->i_mtime
= cpu_to_le64(dir
->i_ctime
.tv_sec
);
1355 di
->i_ctime_nsec
= di
->i_mtime_nsec
= cpu_to_le32(dir
->i_ctime
.tv_nsec
);
1358 * This should never fail as our extent list is empty and all
1359 * related blocks have been journaled already.
1361 ret
= ocfs2_insert_extent(osb
, handle
, dir
, &et
, 0, blkno
, len
,
1369 * Set i_blocks after the extent insert for the most up to
1370 * date ip_clusters value.
1372 dir
->i_blocks
= ocfs2_inode_sector_count(dir
);
1374 ret
= ocfs2_journal_dirty(handle
, di_bh
);
1381 * We asked for two clusters, but only got one in the 1st
1382 * pass. Claim the 2nd cluster as a separate extent.
1385 ret
= ocfs2_claim_clusters(osb
, handle
, data_ac
, 1, &bit_off
,
1391 blkno
= ocfs2_clusters_to_blocks(dir
->i_sb
, bit_off
);
1393 ret
= ocfs2_insert_extent(osb
, handle
, dir
, &et
, 1,
1394 blkno
, len
, 0, NULL
);
1401 *first_block_bh
= dirdata_bh
;
1405 if (ret
< 0 && did_quota
)
1406 vfs_dq_free_space_nodirty(dir
,
1407 ocfs2_clusters_to_bytes(osb
->sb
, 2));
1408 ocfs2_commit_trans(osb
, handle
);
1411 up_write(&oi
->ip_alloc_sem
);
1415 ocfs2_free_alloc_context(data_ac
);
1422 /* returns a bh of the 1st new block in the allocation. */
1423 static int ocfs2_do_extend_dir(struct super_block
*sb
,
1426 struct buffer_head
*parent_fe_bh
,
1427 struct ocfs2_alloc_context
*data_ac
,
1428 struct ocfs2_alloc_context
*meta_ac
,
1429 struct buffer_head
**new_bh
)
1432 int extend
, did_quota
= 0;
1433 u64 p_blkno
, v_blkno
;
1435 spin_lock(&OCFS2_I(dir
)->ip_lock
);
1436 extend
= (i_size_read(dir
) == ocfs2_clusters_to_bytes(sb
, OCFS2_I(dir
)->ip_clusters
));
1437 spin_unlock(&OCFS2_I(dir
)->ip_lock
);
1440 u32 offset
= OCFS2_I(dir
)->ip_clusters
;
1442 if (vfs_dq_alloc_space_nodirty(dir
,
1443 ocfs2_clusters_to_bytes(sb
, 1))) {
1449 status
= ocfs2_add_inode_data(OCFS2_SB(sb
), dir
, &offset
,
1450 1, 0, parent_fe_bh
, handle
,
1451 data_ac
, meta_ac
, NULL
);
1452 BUG_ON(status
== -EAGAIN
);
1459 v_blkno
= ocfs2_blocks_for_bytes(sb
, i_size_read(dir
));
1460 status
= ocfs2_extent_map_get_blocks(dir
, v_blkno
, &p_blkno
, NULL
, NULL
);
1466 *new_bh
= sb_getblk(sb
, p_blkno
);
1474 if (did_quota
&& status
< 0)
1475 vfs_dq_free_space_nodirty(dir
, ocfs2_clusters_to_bytes(sb
, 1));
1481 * Assumes you already have a cluster lock on the directory.
1483 * 'blocks_wanted' is only used if we have an inline directory which
1484 * is to be turned into an extent based one. The size of the dirent to
1485 * insert might be larger than the space gained by growing to just one
1486 * block, so we may have to grow the inode by two blocks in that case.
1488 static int ocfs2_extend_dir(struct ocfs2_super
*osb
,
1490 struct buffer_head
*parent_fe_bh
,
1491 unsigned int blocks_wanted
,
1492 struct buffer_head
**new_de_bh
)
1495 int credits
, num_free_extents
, drop_alloc_sem
= 0;
1497 struct ocfs2_dinode
*fe
= (struct ocfs2_dinode
*) parent_fe_bh
->b_data
;
1498 struct ocfs2_extent_list
*el
= &fe
->id2
.i_list
;
1499 struct ocfs2_alloc_context
*data_ac
= NULL
;
1500 struct ocfs2_alloc_context
*meta_ac
= NULL
;
1501 handle_t
*handle
= NULL
;
1502 struct buffer_head
*new_bh
= NULL
;
1503 struct ocfs2_dir_entry
* de
;
1504 struct super_block
*sb
= osb
->sb
;
1505 struct ocfs2_extent_tree et
;
1509 if (OCFS2_I(dir
)->ip_dyn_features
& OCFS2_INLINE_DATA_FL
) {
1510 status
= ocfs2_expand_inline_dir(dir
, parent_fe_bh
,
1511 blocks_wanted
, &new_bh
);
1517 if (blocks_wanted
== 1) {
1519 * If the new dirent will fit inside the space
1520 * created by pushing out to one block, then
1521 * we can complete the operation
1522 * here. Otherwise we have to expand i_size
1523 * and format the 2nd block below.
1525 BUG_ON(new_bh
== NULL
);
1530 * Get rid of 'new_bh' - we want to format the 2nd
1531 * data block and return that instead.
1536 dir_i_size
= i_size_read(dir
);
1537 credits
= OCFS2_SIMPLE_DIR_EXTEND_CREDITS
;
1541 dir_i_size
= i_size_read(dir
);
1542 mlog(0, "extending dir %llu (i_size = %lld)\n",
1543 (unsigned long long)OCFS2_I(dir
)->ip_blkno
, dir_i_size
);
1545 /* dir->i_size is always block aligned. */
1546 spin_lock(&OCFS2_I(dir
)->ip_lock
);
1547 if (dir_i_size
== ocfs2_clusters_to_bytes(sb
, OCFS2_I(dir
)->ip_clusters
)) {
1548 spin_unlock(&OCFS2_I(dir
)->ip_lock
);
1549 ocfs2_init_dinode_extent_tree(&et
, dir
, parent_fe_bh
);
1550 num_free_extents
= ocfs2_num_free_extents(osb
, dir
, &et
);
1551 if (num_free_extents
< 0) {
1552 status
= num_free_extents
;
1557 if (!num_free_extents
) {
1558 status
= ocfs2_reserve_new_metadata(osb
, el
, &meta_ac
);
1560 if (status
!= -ENOSPC
)
1566 status
= ocfs2_reserve_clusters(osb
, 1, &data_ac
);
1568 if (status
!= -ENOSPC
)
1573 credits
= ocfs2_calc_extend_credits(sb
, el
, 1);
1575 spin_unlock(&OCFS2_I(dir
)->ip_lock
);
1576 credits
= OCFS2_SIMPLE_DIR_EXTEND_CREDITS
;
1580 down_write(&OCFS2_I(dir
)->ip_alloc_sem
);
1583 handle
= ocfs2_start_trans(osb
, credits
);
1584 if (IS_ERR(handle
)) {
1585 status
= PTR_ERR(handle
);
1591 status
= ocfs2_do_extend_dir(osb
->sb
, handle
, dir
, parent_fe_bh
,
1592 data_ac
, meta_ac
, &new_bh
);
1598 ocfs2_set_new_buffer_uptodate(dir
, new_bh
);
1600 status
= ocfs2_journal_access_db(handle
, dir
, new_bh
,
1601 OCFS2_JOURNAL_ACCESS_CREATE
);
1606 memset(new_bh
->b_data
, 0, sb
->s_blocksize
);
1607 de
= (struct ocfs2_dir_entry
*) new_bh
->b_data
;
1609 de
->rec_len
= cpu_to_le16(sb
->s_blocksize
);
1610 status
= ocfs2_journal_dirty(handle
, new_bh
);
1616 dir_i_size
+= dir
->i_sb
->s_blocksize
;
1617 i_size_write(dir
, dir_i_size
);
1618 dir
->i_blocks
= ocfs2_inode_sector_count(dir
);
1619 status
= ocfs2_mark_inode_dirty(handle
, dir
, parent_fe_bh
);
1626 *new_de_bh
= new_bh
;
1630 up_write(&OCFS2_I(dir
)->ip_alloc_sem
);
1632 ocfs2_commit_trans(osb
, handle
);
1635 ocfs2_free_alloc_context(data_ac
);
1637 ocfs2_free_alloc_context(meta_ac
);
1645 static int ocfs2_find_dir_space_id(struct inode
*dir
, struct buffer_head
*di_bh
,
1646 const char *name
, int namelen
,
1647 struct buffer_head
**ret_de_bh
,
1648 unsigned int *blocks_wanted
)
1651 struct ocfs2_dinode
*di
= (struct ocfs2_dinode
*)di_bh
->b_data
;
1652 struct ocfs2_dir_entry
*de
, *last_de
= NULL
;
1653 char *de_buf
, *limit
;
1654 unsigned long offset
= 0;
1655 unsigned int rec_len
, new_rec_len
;
1657 de_buf
= di
->id2
.i_data
.id_data
;
1658 limit
= de_buf
+ i_size_read(dir
);
1659 rec_len
= OCFS2_DIR_REC_LEN(namelen
);
1661 while (de_buf
< limit
) {
1662 de
= (struct ocfs2_dir_entry
*)de_buf
;
1664 if (!ocfs2_check_dir_entry(dir
, de
, di_bh
, offset
)) {
1668 if (ocfs2_match(namelen
, name
, de
)) {
1672 if (ocfs2_dirent_would_fit(de
, rec_len
)) {
1673 /* Ok, we found a spot. Return this bh and let
1674 * the caller actually fill it in. */
1682 de_buf
+= le16_to_cpu(de
->rec_len
);
1683 offset
+= le16_to_cpu(de
->rec_len
);
1687 * We're going to require expansion of the directory - figure
1688 * out how many blocks we'll need so that a place for the
1689 * dirent can be found.
1692 new_rec_len
= le16_to_cpu(last_de
->rec_len
) + (dir
->i_sb
->s_blocksize
- i_size_read(dir
));
1693 if (new_rec_len
< (rec_len
+ OCFS2_DIR_REC_LEN(last_de
->name_len
)))
1701 static int ocfs2_find_dir_space_el(struct inode
*dir
, const char *name
,
1702 int namelen
, struct buffer_head
**ret_de_bh
)
1704 unsigned long offset
;
1705 struct buffer_head
*bh
= NULL
;
1706 unsigned short rec_len
;
1707 struct ocfs2_dir_entry
*de
;
1708 struct super_block
*sb
= dir
->i_sb
;
1711 status
= ocfs2_read_dir_block(dir
, 0, &bh
, 0);
1717 rec_len
= OCFS2_DIR_REC_LEN(namelen
);
1719 de
= (struct ocfs2_dir_entry
*) bh
->b_data
;
1721 if ((char *)de
>= sb
->s_blocksize
+ bh
->b_data
) {
1725 if (i_size_read(dir
) <= offset
) {
1727 * Caller will have to expand this
1733 status
= ocfs2_read_dir_block(dir
,
1734 offset
>> sb
->s_blocksize_bits
,
1740 /* move to next block */
1741 de
= (struct ocfs2_dir_entry
*) bh
->b_data
;
1743 if (!ocfs2_check_dir_entry(dir
, de
, bh
, offset
)) {
1747 if (ocfs2_match(namelen
, name
, de
)) {
1751 if (ocfs2_dirent_would_fit(de
, rec_len
)) {
1752 /* Ok, we found a spot. Return this bh and let
1753 * the caller actually fill it in. */
1759 offset
+= le16_to_cpu(de
->rec_len
);
1760 de
= (struct ocfs2_dir_entry
*)((char *) de
+ le16_to_cpu(de
->rec_len
));
1771 int ocfs2_prepare_dir_for_insert(struct ocfs2_super
*osb
,
1773 struct buffer_head
*parent_fe_bh
,
1776 struct buffer_head
**ret_de_bh
)
1779 unsigned int blocks_wanted
= 1;
1780 struct buffer_head
*bh
= NULL
;
1782 mlog(0, "getting ready to insert namelen %d into dir %llu\n",
1783 namelen
, (unsigned long long)OCFS2_I(dir
)->ip_blkno
);
1793 if (OCFS2_I(dir
)->ip_dyn_features
& OCFS2_INLINE_DATA_FL
) {
1794 ret
= ocfs2_find_dir_space_id(dir
, parent_fe_bh
, name
,
1795 namelen
, &bh
, &blocks_wanted
);
1797 ret
= ocfs2_find_dir_space_el(dir
, name
, namelen
, &bh
);
1799 if (ret
&& ret
!= -ENOSPC
) {
1804 if (ret
== -ENOSPC
) {
1806 * We have to expand the directory to add this name.
1810 ret
= ocfs2_extend_dir(osb
, dir
, parent_fe_bh
, blocks_wanted
,