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1 /* -*- mode: c; c-basic-offset: 8; -*-
2  * vim: noexpandtab sw=8 ts=8 sts=0:
3  *
4  * dir.c
5  *
6  * Creates, reads, walks and deletes directory-nodes
7  *
8  * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
9  *
10  *  Portions of this code from linux/fs/ext3/dir.c
11  *
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)
16  *
17  *   from
18  *
19  *   linux/fs/minix/dir.c
20  *
21  *   Copyright (C) 1991, 1992 Linux Torvalds
22  *
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.
27  *
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.
32  *
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.
37  */
38
39 #include <linux/fs.h>
40 #include <linux/types.h>
41 #include <linux/slab.h>
42 #include <linux/highmem.h>
43 #include <linux/quotaops.h>
44
45 #define MLOG_MASK_PREFIX ML_NAMEI
46 #include <cluster/masklog.h>
47
48 #include "ocfs2.h"
49
50 #include "alloc.h"
51 #include "dir.h"
52 #include "dlmglue.h"
53 #include "extent_map.h"
54 #include "file.h"
55 #include "inode.h"
56 #include "journal.h"
57 #include "namei.h"
58 #include "suballoc.h"
59 #include "super.h"
60 #include "uptodate.h"
61
62 #include "buffer_head_io.h"
63
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))
68
69 static unsigned char ocfs2_filetype_table[] = {
70         DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
71 };
72
73 static int ocfs2_extend_dir(struct ocfs2_super *osb,
74                             struct inode *dir,
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,
79                                handle_t *handle,
80                                struct inode *dir,
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);
85
86 /*
87  * bh passed here can be an inode block or a dir data block, depending
88  * on the inode inline data flag.
89  */
90 static int ocfs2_check_dir_entry(struct inode * dir,
91                                  struct ocfs2_dir_entry * de,
92                                  struct buffer_head * bh,
93                                  unsigned long offset)
94 {
95         const char *error_msg = NULL;
96         const int rlen = le16_to_cpu(de->rec_len);
97
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";
106
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,
112                      de->name_len);
113         return error_msg == NULL ? 1 : 0;
114 }
115
116 static inline int ocfs2_match(int len,
117                               const char * const name,
118                               struct ocfs2_dir_entry *de)
119 {
120         if (len != de->name_len)
121                 return 0;
122         if (!de->inode)
123                 return 0;
124         return !memcmp(name, de->name, len);
125 }
126
127 /*
128  * Returns 0 if not found, -1 on failure, and 1 on success
129  */
130 static int inline ocfs2_search_dirblock(struct buffer_head *bh,
131                                         struct inode *dir,
132                                         const char *name, int namelen,
133                                         unsigned long offset,
134                                         char *first_de,
135                                         unsigned int bytes,
136                                         struct ocfs2_dir_entry **res_dir)
137 {
138         struct ocfs2_dir_entry *de;
139         char *dlimit, *de_buf;
140         int de_len;
141         int ret = 0;
142
143         mlog_entry_void();
144
145         de_buf = first_de;
146         dlimit = de_buf + bytes;
147
148         while (de_buf < dlimit) {
149                 /* this code is executed quadratically often */
150                 /* do minimal checking `by hand' */
151
152                 de = (struct ocfs2_dir_entry *) de_buf;
153
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)) {
158                                 ret = -1;
159                                 goto bail;
160                         }
161                         *res_dir = de;
162                         ret = 1;
163                         goto bail;
164                 }
165
166                 /* prevent looping on a bad block */
167                 de_len = le16_to_cpu(de->rec_len);
168                 if (de_len <= 0) {
169                         ret = -1;
170                         goto bail;
171                 }
172
173                 de_buf += de_len;
174                 offset += de_len;
175         }
176
177 bail:
178         mlog_exit(ret);
179         return ret;
180 }
181
182 static struct buffer_head *ocfs2_find_entry_id(const char *name,
183                                                int namelen,
184                                                struct inode *dir,
185                                                struct ocfs2_dir_entry **res_dir)
186 {
187         int ret, found;
188         struct buffer_head *di_bh = NULL;
189         struct ocfs2_dinode *di;
190         struct ocfs2_inline_data *data;
191
192         ret = ocfs2_read_inode_block(dir, &di_bh);
193         if (ret) {
194                 mlog_errno(ret);
195                 goto out;
196         }
197
198         di = (struct ocfs2_dinode *)di_bh->b_data;
199         data = &di->id2.i_data;
200
201         found = ocfs2_search_dirblock(di_bh, dir, name, namelen, 0,
202                                       data->id_data, i_size_read(dir), res_dir);
203         if (found == 1)
204                 return di_bh;
205
206         brelse(di_bh);
207 out:
208         return NULL;
209 }
210
211 static int ocfs2_validate_dir_block(struct super_block *sb,
212                                     struct buffer_head *bh)
213 {
214         /*
215          * Nothing yet.  We don't validate dirents here, that's handled
216          * in-place when the code walks them.
217          */
218         mlog(0, "Validating dirblock %llu\n",
219              (unsigned long long)bh->b_blocknr);
220
221         return 0;
222 }
223
224 /*
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.
229  */
230 static int ocfs2_read_dir_block(struct inode *inode, u64 v_block,
231                                 struct buffer_head **bh, int flags)
232 {
233         int rc = 0;
234         struct buffer_head *tmp = *bh;
235
236         rc = ocfs2_read_virt_blocks(inode, v_block, 1, &tmp, flags,
237                                     ocfs2_validate_dir_block);
238         if (rc)
239                 mlog_errno(rc);
240
241         /* If ocfs2_read_virt_blocks() got us a new bh, pass it up. */
242         if (!rc && !*bh)
243                 *bh = tmp;
244
245         return rc ? -EIO : 0;
246 }
247
248 static struct buffer_head *ocfs2_find_entry_el(const char *name, int namelen,
249                                                struct inode *dir,
250                                                struct ocfs2_dir_entry **res_dir)
251 {
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
257                                    buffer, bh_use[] */
258         int ra_ptr = 0;         /* Current index into readahead
259                                    buffer */
260         int num = 0;
261         int nblocks, i, err;
262
263         mlog_entry_void();
264
265         sb = dir->i_sb;
266
267         nblocks = i_size_read(dir) >> sb->s_blocksize_bits;
268         start = OCFS2_I(dir)->ip_dir_start_lookup;
269         if (start >= nblocks)
270                 start = 0;
271         block = start;
272
273 restart:
274         do {
275                 /*
276                  * We deal with the read-ahead logic here.
277                  */
278                 if (ra_ptr >= ra_max) {
279                         /* Refill the readahead buffer */
280                         ra_ptr = 0;
281                         b = block;
282                         for (ra_max = 0; ra_max < NAMEI_RA_SIZE; ra_max++) {
283                                 /*
284                                  * Terminate if we reach the end of the
285                                  * directory and must wrap, or if our
286                                  * search has finished at this block.
287                                  */
288                                 if (b >= nblocks || (num && block == start)) {
289                                         bh_use[ra_max] = NULL;
290                                         break;
291                                 }
292                                 num++;
293
294                                 bh = NULL;
295                                 err = ocfs2_read_dir_block(dir, b++, &bh,
296                                                            OCFS2_BH_READAHEAD);
297                                 bh_use[ra_max] = bh;
298                         }
299                 }
300                 if ((bh = bh_use[ra_ptr++]) == NULL)
301                         goto next;
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, "
306                                     "offset %lu\n",
307                                     (unsigned long long)OCFS2_I(dir)->ip_blkno,
308                                     block);
309                         goto next;
310                 }
311                 i = ocfs2_search_dirblock(bh, dir, name, namelen,
312                                           block << sb->s_blocksize_bits,
313                                           bh->b_data, sb->s_blocksize,
314                                           res_dir);
315                 if (i == 1) {
316                         OCFS2_I(dir)->ip_dir_start_lookup = block;
317                         ret = bh;
318                         goto cleanup_and_exit;
319                 } else {
320                         brelse(bh);
321                         if (i < 0)
322                                 goto cleanup_and_exit;
323                 }
324         next:
325                 if (++block >= nblocks)
326                         block = 0;
327         } while (block != start);
328
329         /*
330          * If the directory has grown while we were searching, then
331          * search the last part of the directory before giving up.
332          */
333         block = nblocks;
334         nblocks = i_size_read(dir) >> sb->s_blocksize_bits;
335         if (block < nblocks) {
336                 start = 0;
337                 goto restart;
338         }
339
340 cleanup_and_exit:
341         /* Clean up the read-ahead blocks */
342         for (; ra_ptr < ra_max; ra_ptr++)
343                 brelse(bh_use[ra_ptr]);
344
345         mlog_exit_ptr(ret);
346         return ret;
347 }
348
349 /*
350  * Try to find an entry of the provided name within 'dir'.
351  *
352  * If nothing was found, NULL is returned. Otherwise, a buffer_head
353  * and pointer to the dir entry are passed back.
354  *
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.
360  */
361 struct buffer_head *ocfs2_find_entry(const char *name, int namelen,
362                                      struct inode *dir,
363                                      struct ocfs2_dir_entry **res_dir)
364 {
365         *res_dir = NULL;
366
367         if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
368                 return ocfs2_find_entry_id(name, namelen, dir, res_dir);
369
370         return ocfs2_find_entry_el(name, namelen, dir, res_dir);
371 }
372
373 /*
374  * Update inode number and type of a previously found directory entry.
375  */
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)
379 {
380         int ret;
381
382         /*
383          * The same code works fine for both inline-data and extent
384          * based directories, so no need to split this up.
385          */
386
387         ret = ocfs2_journal_access(handle, dir, de_bh,
388                                    OCFS2_JOURNAL_ACCESS_WRITE);
389         if (ret) {
390                 mlog_errno(ret);
391                 goto out;
392         }
393
394         de->inode = cpu_to_le64(OCFS2_I(new_entry_inode)->ip_blkno);
395         ocfs2_set_de_type(de, new_entry_inode->i_mode);
396
397         ocfs2_journal_dirty(handle, de_bh);
398
399 out:
400         return ret;
401 }
402
403 static int __ocfs2_delete_entry(handle_t *handle, struct inode *dir,
404                                 struct ocfs2_dir_entry *de_del,
405                                 struct buffer_head *bh, char *first_de,
406                                 unsigned int bytes)
407 {
408         struct ocfs2_dir_entry *de, *pde;
409         int i, status = -ENOENT;
410
411         mlog_entry("(0x%p, 0x%p, 0x%p, 0x%p)\n", handle, dir, de_del, bh);
412
413         i = 0;
414         pde = NULL;
415         de = (struct ocfs2_dir_entry *) first_de;
416         while (i < bytes) {
417                 if (!ocfs2_check_dir_entry(dir, de, bh, i)) {
418                         status = -EIO;
419                         mlog_errno(status);
420                         goto bail;
421                 }
422                 if (de == de_del)  {
423                         status = ocfs2_journal_access(handle, dir, bh,
424                                                       OCFS2_JOURNAL_ACCESS_WRITE);
425                         if (status < 0) {
426                                 status = -EIO;
427                                 mlog_errno(status);
428                                 goto bail;
429                         }
430                         if (pde)
431                                 le16_add_cpu(&pde->rec_len,
432                                                 le16_to_cpu(de->rec_len));
433                         else
434                                 de->inode = 0;
435                         dir->i_version++;
436                         status = ocfs2_journal_dirty(handle, bh);
437                         goto bail;
438                 }
439                 i += le16_to_cpu(de->rec_len);
440                 pde = de;
441                 de = (struct ocfs2_dir_entry *)((char *)de + le16_to_cpu(de->rec_len));
442         }
443 bail:
444         mlog_exit(status);
445         return status;
446 }
447
448 static inline int ocfs2_delete_entry_id(handle_t *handle,
449                                         struct inode *dir,
450                                         struct ocfs2_dir_entry *de_del,
451                                         struct buffer_head *bh)
452 {
453         int ret;
454         struct buffer_head *di_bh = NULL;
455         struct ocfs2_dinode *di;
456         struct ocfs2_inline_data *data;
457
458         ret = ocfs2_read_inode_block(dir, &di_bh);
459         if (ret) {
460                 mlog_errno(ret);
461                 goto out;
462         }
463
464         di = (struct ocfs2_dinode *)di_bh->b_data;
465         data = &di->id2.i_data;
466
467         ret = __ocfs2_delete_entry(handle, dir, de_del, bh, data->id_data,
468                                    i_size_read(dir));
469
470         brelse(di_bh);
471 out:
472         return ret;
473 }
474
475 static inline int ocfs2_delete_entry_el(handle_t *handle,
476                                         struct inode *dir,
477                                         struct ocfs2_dir_entry *de_del,
478                                         struct buffer_head *bh)
479 {
480         return __ocfs2_delete_entry(handle, dir, de_del, bh, bh->b_data,
481                                     bh->b_size);
482 }
483
484 /*
485  * ocfs2_delete_entry deletes a directory entry by merging it with the
486  * previous entry
487  */
488 int ocfs2_delete_entry(handle_t *handle,
489                        struct inode *dir,
490                        struct ocfs2_dir_entry *de_del,
491                        struct buffer_head *bh)
492 {
493         if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
494                 return ocfs2_delete_entry_id(handle, dir, de_del, bh);
495
496         return ocfs2_delete_entry_el(handle, dir, de_del, bh);
497 }
498
499 /*
500  * Check whether 'de' has enough room to hold an entry of
501  * 'new_rec_len' bytes.
502  */
503 static inline int ocfs2_dirent_would_fit(struct ocfs2_dir_entry *de,
504                                          unsigned int new_rec_len)
505 {
506         unsigned int de_really_used;
507
508         /* Check whether this is an empty record with enough space */
509         if (le64_to_cpu(de->inode) == 0 &&
510             le16_to_cpu(de->rec_len) >= new_rec_len)
511                 return 1;
512
513         /*
514          * Record might have free space at the end which we can
515          * use.
516          */
517         de_really_used = OCFS2_DIR_REC_LEN(de->name_len);
518         if (le16_to_cpu(de->rec_len) >= (de_really_used + new_rec_len))
519             return 1;
520
521         return 0;
522 }
523
524 /* we don't always have a dentry for what we want to add, so people
525  * like orphan dir can call this instead.
526  *
527  * If you pass me insert_bh, I'll skip the search of the other dir
528  * blocks and put the record in there.
529  */
530 int __ocfs2_add_entry(handle_t *handle,
531                       struct inode *dir,
532                       const char *name, int namelen,
533                       struct inode *inode, u64 blkno,
534                       struct buffer_head *parent_fe_bh,
535                       struct buffer_head *insert_bh)
536 {
537         unsigned long offset;
538         unsigned short rec_len;
539         struct ocfs2_dir_entry *de, *de1;
540         struct ocfs2_dinode *di = (struct ocfs2_dinode *)parent_fe_bh->b_data;
541         struct super_block *sb = dir->i_sb;
542         int retval, status;
543         unsigned int size = sb->s_blocksize;
544         char *data_start = insert_bh->b_data;
545
546         mlog_entry_void();
547
548         if (!namelen)
549                 return -EINVAL;
550
551         if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
552                 data_start = di->id2.i_data.id_data;
553                 size = i_size_read(dir);
554
555                 BUG_ON(insert_bh != parent_fe_bh);
556         }
557
558         rec_len = OCFS2_DIR_REC_LEN(namelen);
559         offset = 0;
560         de = (struct ocfs2_dir_entry *) data_start;
561         while (1) {
562                 BUG_ON((char *)de >= (size + data_start));
563
564                 /* These checks should've already been passed by the
565                  * prepare function, but I guess we can leave them
566                  * here anyway. */
567                 if (!ocfs2_check_dir_entry(dir, de, insert_bh, offset)) {
568                         retval = -ENOENT;
569                         goto bail;
570                 }
571                 if (ocfs2_match(namelen, name, de)) {
572                         retval = -EEXIST;
573                         goto bail;
574                 }
575
576                 if (ocfs2_dirent_would_fit(de, rec_len)) {
577                         dir->i_mtime = dir->i_ctime = CURRENT_TIME;
578                         retval = ocfs2_mark_inode_dirty(handle, dir, parent_fe_bh);
579                         if (retval < 0) {
580                                 mlog_errno(retval);
581                                 goto bail;
582                         }
583
584                         status = ocfs2_journal_access(handle, dir, insert_bh,
585                                                       OCFS2_JOURNAL_ACCESS_WRITE);
586                         /* By now the buffer is marked for journaling */
587                         offset += le16_to_cpu(de->rec_len);
588                         if (le64_to_cpu(de->inode)) {
589                                 de1 = (struct ocfs2_dir_entry *)((char *) de +
590                                         OCFS2_DIR_REC_LEN(de->name_len));
591                                 de1->rec_len =
592                                         cpu_to_le16(le16_to_cpu(de->rec_len) -
593                                         OCFS2_DIR_REC_LEN(de->name_len));
594                                 de->rec_len = cpu_to_le16(OCFS2_DIR_REC_LEN(de->name_len));
595                                 de = de1;
596                         }
597                         de->file_type = OCFS2_FT_UNKNOWN;
598                         if (blkno) {
599                                 de->inode = cpu_to_le64(blkno);
600                                 ocfs2_set_de_type(de, inode->i_mode);
601                         } else
602                                 de->inode = 0;
603                         de->name_len = namelen;
604                         memcpy(de->name, name, namelen);
605
606                         dir->i_version++;
607                         status = ocfs2_journal_dirty(handle, insert_bh);
608                         retval = 0;
609                         goto bail;
610                 }
611                 offset += le16_to_cpu(de->rec_len);
612                 de = (struct ocfs2_dir_entry *) ((char *) de + le16_to_cpu(de->rec_len));
613         }
614
615         /* when you think about it, the assert above should prevent us
616          * from ever getting here. */
617         retval = -ENOSPC;
618 bail:
619
620         mlog_exit(retval);
621         return retval;
622 }
623
624 static int ocfs2_dir_foreach_blk_id(struct inode *inode,
625                                     u64 *f_version,
626                                     loff_t *f_pos, void *priv,
627                                     filldir_t filldir, int *filldir_err)
628 {
629         int ret, i, filldir_ret;
630         unsigned long offset = *f_pos;
631         struct buffer_head *di_bh = NULL;
632         struct ocfs2_dinode *di;
633         struct ocfs2_inline_data *data;
634         struct ocfs2_dir_entry *de;
635
636         ret = ocfs2_read_inode_block(inode, &di_bh);
637         if (ret) {
638                 mlog(ML_ERROR, "Unable to read inode block for dir %llu\n",
639                      (unsigned long long)OCFS2_I(inode)->ip_blkno);
640                 goto out;
641         }
642
643         di = (struct ocfs2_dinode *)di_bh->b_data;
644         data = &di->id2.i_data;
645
646         while (*f_pos < i_size_read(inode)) {
647 revalidate:
648                 /* If the dir block has changed since the last call to
649                  * readdir(2), then we might be pointing to an invalid
650                  * dirent right now.  Scan from the start of the block
651                  * to make sure. */
652                 if (*f_version != inode->i_version) {
653                         for (i = 0; i < i_size_read(inode) && i < offset; ) {
654                                 de = (struct ocfs2_dir_entry *)
655                                         (data->id_data + i);
656                                 /* It's too expensive to do a full
657                                  * dirent test each time round this
658                                  * loop, but we do have to test at
659                                  * least that it is non-zero.  A
660                                  * failure will be detected in the
661                                  * dirent test below. */
662                                 if (le16_to_cpu(de->rec_len) <
663                                     OCFS2_DIR_REC_LEN(1))
664                                         break;
665                                 i += le16_to_cpu(de->rec_len);
666                         }
667                         *f_pos = offset = i;
668                         *f_version = inode->i_version;
669                 }
670
671                 de = (struct ocfs2_dir_entry *) (data->id_data + *f_pos);
672                 if (!ocfs2_check_dir_entry(inode, de, di_bh, *f_pos)) {
673                         /* On error, skip the f_pos to the end. */
674                         *f_pos = i_size_read(inode);
675                         goto out;
676                 }
677                 offset += le16_to_cpu(de->rec_len);
678                 if (le64_to_cpu(de->inode)) {
679                         /* We might block in the next section
680                          * if the data destination is
681                          * currently swapped out.  So, use a
682                          * version stamp to detect whether or
683                          * not the directory has been modified
684                          * during the copy operation.
685                          */
686                         u64 version = *f_version;
687                         unsigned char d_type = DT_UNKNOWN;
688
689                         if (de->file_type < OCFS2_FT_MAX)
690                                 d_type = ocfs2_filetype_table[de->file_type];
691
692                         filldir_ret = filldir(priv, de->name,
693                                               de->name_len,
694                                               *f_pos,
695                                               le64_to_cpu(de->inode),
696                                               d_type);
697                         if (filldir_ret) {
698                                 if (filldir_err)
699                                         *filldir_err = filldir_ret;
700                                 break;
701                         }
702                         if (version != *f_version)
703                                 goto revalidate;
704                 }
705                 *f_pos += le16_to_cpu(de->rec_len);
706         }
707
708 out:
709         brelse(di_bh);
710
711         return 0;
712 }
713
714 static int ocfs2_dir_foreach_blk_el(struct inode *inode,
715                                     u64 *f_version,
716                                     loff_t *f_pos, void *priv,
717                                     filldir_t filldir, int *filldir_err)
718 {
719         int error = 0;
720         unsigned long offset, blk, last_ra_blk = 0;
721         int i, stored;
722         struct buffer_head * bh, * tmp;
723         struct ocfs2_dir_entry * de;
724         struct super_block * sb = inode->i_sb;
725         unsigned int ra_sectors = 16;
726
727         stored = 0;
728         bh = NULL;
729
730         offset = (*f_pos) & (sb->s_blocksize - 1);
731
732         while (!error && !stored && *f_pos < i_size_read(inode)) {
733                 blk = (*f_pos) >> sb->s_blocksize_bits;
734                 if (ocfs2_read_dir_block(inode, blk, &bh, 0)) {
735                         /* Skip the corrupt dirblock and keep trying */
736                         *f_pos += sb->s_blocksize - offset;
737                         continue;
738                 }
739
740                 /* The idea here is to begin with 8k read-ahead and to stay
741                  * 4k ahead of our current position.
742                  *
743                  * TODO: Use the pagecache for this. We just need to
744                  * make sure it's cluster-safe... */
745                 if (!last_ra_blk
746                     || (((last_ra_blk - blk) << 9) <= (ra_sectors / 2))) {
747                         for (i = ra_sectors >> (sb->s_blocksize_bits - 9);
748                              i > 0; i--) {
749                                 tmp = NULL;
750                                 if (!ocfs2_read_dir_block(inode, ++blk, &tmp,
751                                                           OCFS2_BH_READAHEAD))
752                                         brelse(tmp);
753                         }
754                         last_ra_blk = blk;
755                         ra_sectors = 8;
756                 }
757
758 revalidate:
759                 /* If the dir block has changed since the last call to
760                  * readdir(2), then we might be pointing to an invalid
761                  * dirent right now.  Scan from the start of the block
762                  * to make sure. */
763                 if (*f_version != inode->i_version) {
764                         for (i = 0; i < sb->s_blocksize && i < offset; ) {
765                                 de = (struct ocfs2_dir_entry *) (bh->b_data + i);
766                                 /* It's too expensive to do a full
767                                  * dirent test each time round this
768                                  * loop, but we do have to test at
769                                  * least that it is non-zero.  A
770                                  * failure will be detected in the
771                                  * dirent test below. */
772                                 if (le16_to_cpu(de->rec_len) <
773                                     OCFS2_DIR_REC_LEN(1))
774                                         break;
775                                 i += le16_to_cpu(de->rec_len);
776                         }
777                         offset = i;
778                         *f_pos = ((*f_pos) & ~(sb->s_blocksize - 1))
779                                 | offset;
780                         *f_version = inode->i_version;
781                 }
782
783                 while (!error && *f_pos < i_size_read(inode)
784                        && offset < sb->s_blocksize) {
785                         de = (struct ocfs2_dir_entry *) (bh->b_data + offset);
786                         if (!ocfs2_check_dir_entry(inode, de, bh, offset)) {
787                                 /* On error, skip the f_pos to the
788                                    next block. */
789                                 *f_pos = ((*f_pos) | (sb->s_blocksize - 1)) + 1;
790                                 brelse(bh);
791                                 goto out;
792                         }
793                         offset += le16_to_cpu(de->rec_len);
794                         if (le64_to_cpu(de->inode)) {
795                                 /* We might block in the next section
796                                  * if the data destination is
797                                  * currently swapped out.  So, use a
798                                  * version stamp to detect whether or
799                                  * not the directory has been modified
800                                  * during the copy operation.
801                                  */
802                                 unsigned long version = *f_version;
803                                 unsigned char d_type = DT_UNKNOWN;
804
805                                 if (de->file_type < OCFS2_FT_MAX)
806                                         d_type = ocfs2_filetype_table[de->file_type];
807                                 error = filldir(priv, de->name,
808                                                 de->name_len,
809                                                 *f_pos,
810                                                 le64_to_cpu(de->inode),
811                                                 d_type);
812                                 if (error) {
813                                         if (filldir_err)
814                                                 *filldir_err = error;
815                                         break;
816                                 }
817                                 if (version != *f_version)
818                                         goto revalidate;
819                                 stored ++;
820                         }
821                         *f_pos += le16_to_cpu(de->rec_len);
822                 }
823                 offset = 0;
824                 brelse(bh);
825                 bh = NULL;
826         }
827
828         stored = 0;
829 out:
830         return stored;
831 }
832
833 static int ocfs2_dir_foreach_blk(struct inode *inode, u64 *f_version,
834                                  loff_t *f_pos, void *priv, filldir_t filldir,
835                                  int *filldir_err)
836 {
837         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
838                 return ocfs2_dir_foreach_blk_id(inode, f_version, f_pos, priv,
839                                                 filldir, filldir_err);
840
841         return ocfs2_dir_foreach_blk_el(inode, f_version, f_pos, priv, filldir,
842                                         filldir_err);
843 }
844
845 /*
846  * This is intended to be called from inside other kernel functions,
847  * so we fake some arguments.
848  */
849 int ocfs2_dir_foreach(struct inode *inode, loff_t *f_pos, void *priv,
850                       filldir_t filldir)
851 {
852         int ret = 0, filldir_err = 0;
853         u64 version = inode->i_version;
854
855         while (*f_pos < i_size_read(inode)) {
856                 ret = ocfs2_dir_foreach_blk(inode, &version, f_pos, priv,
857                                             filldir, &filldir_err);
858                 if (ret || filldir_err)
859                         break;
860         }
861
862         if (ret > 0)
863                 ret = -EIO;
864
865         return 0;
866 }
867
868 /*
869  * ocfs2_readdir()
870  *
871  */
872 int ocfs2_readdir(struct file * filp, void * dirent, filldir_t filldir)
873 {
874         int error = 0;
875         struct inode *inode = filp->f_path.dentry->d_inode;
876         int lock_level = 0;
877
878         mlog_entry("dirino=%llu\n",
879                    (unsigned long long)OCFS2_I(inode)->ip_blkno);
880
881         error = ocfs2_inode_lock_atime(inode, filp->f_vfsmnt, &lock_level);
882         if (lock_level && error >= 0) {
883                 /* We release EX lock which used to update atime
884                  * and get PR lock again to reduce contention
885                  * on commonly accessed directories. */
886                 ocfs2_inode_unlock(inode, 1);
887                 lock_level = 0;
888                 error = ocfs2_inode_lock(inode, NULL, 0);
889         }
890         if (error < 0) {
891                 if (error != -ENOENT)
892                         mlog_errno(error);
893                 /* we haven't got any yet, so propagate the error. */
894                 goto bail_nolock;
895         }
896
897         error = ocfs2_dir_foreach_blk(inode, &filp->f_version, &filp->f_pos,
898                                       dirent, filldir, NULL);
899
900         ocfs2_inode_unlock(inode, lock_level);
901
902 bail_nolock:
903         mlog_exit(error);
904
905         return error;
906 }
907
908 /*
909  * NOTE: this should always be called with parent dir i_mutex taken.
910  */
911 int ocfs2_find_files_on_disk(const char *name,
912                              int namelen,
913                              u64 *blkno,
914                              struct inode *inode,
915                              struct buffer_head **dirent_bh,
916                              struct ocfs2_dir_entry **dirent)
917 {
918         int status = -ENOENT;
919
920         mlog_entry("(name=%.*s, blkno=%p, inode=%p, dirent_bh=%p, dirent=%p)\n",
921                    namelen, name, blkno, inode, dirent_bh, dirent);
922
923         *dirent_bh = ocfs2_find_entry(name, namelen, inode, dirent);
924         if (!*dirent_bh || !*dirent) {
925                 status = -ENOENT;
926                 goto leave;
927         }
928
929         *blkno = le64_to_cpu((*dirent)->inode);
930
931         status = 0;
932 leave:
933         if (status < 0) {
934                 *dirent = NULL;
935                 brelse(*dirent_bh);
936                 *dirent_bh = NULL;
937         }
938
939         mlog_exit(status);
940         return status;
941 }
942
943 /*
944  * Convenience function for callers which just want the block number
945  * mapped to a name and don't require the full dirent info, etc.
946  */
947 int ocfs2_lookup_ino_from_name(struct inode *dir, const char *name,
948                                int namelen, u64 *blkno)
949 {
950         int ret;
951         struct buffer_head *bh = NULL;
952         struct ocfs2_dir_entry *dirent = NULL;
953
954         ret = ocfs2_find_files_on_disk(name, namelen, blkno, dir, &bh, &dirent);
955         brelse(bh);
956
957         return ret;
958 }
959
960 /* Check for a name within a directory.
961  *
962  * Return 0 if the name does not exist
963  * Return -EEXIST if the directory contains the name
964  *
965  * Callers should have i_mutex + a cluster lock on dir
966  */
967 int ocfs2_check_dir_for_entry(struct inode *dir,
968                               const char *name,
969                               int namelen)
970 {
971         int ret;
972         struct buffer_head *dirent_bh = NULL;
973         struct ocfs2_dir_entry *dirent = NULL;
974
975         mlog_entry("dir %llu, name '%.*s'\n",
976                    (unsigned long long)OCFS2_I(dir)->ip_blkno, namelen, name);
977
978         ret = -EEXIST;
979         dirent_bh = ocfs2_find_entry(name, namelen, dir, &dirent);
980         if (dirent_bh)
981                 goto bail;
982
983         ret = 0;
984 bail:
985         brelse(dirent_bh);
986
987         mlog_exit(ret);
988         return ret;
989 }
990
991 struct ocfs2_empty_dir_priv {
992         unsigned seen_dot;
993         unsigned seen_dot_dot;
994         unsigned seen_other;
995 };
996 static int ocfs2_empty_dir_filldir(void *priv, const char *name, int name_len,
997                                    loff_t pos, u64 ino, unsigned type)
998 {
999         struct ocfs2_empty_dir_priv *p = priv;
1000
1001         /*
1002          * Check the positions of "." and ".." records to be sure
1003          * they're in the correct place.
1004          */
1005         if (name_len == 1 && !strncmp(".", name, 1) && pos == 0) {
1006                 p->seen_dot = 1;
1007                 return 0;
1008         }
1009
1010         if (name_len == 2 && !strncmp("..", name, 2) &&
1011             pos == OCFS2_DIR_REC_LEN(1)) {
1012                 p->seen_dot_dot = 1;
1013                 return 0;
1014         }
1015
1016         p->seen_other = 1;
1017         return 1;
1018 }
1019 /*
1020  * routine to check that the specified directory is empty (for rmdir)
1021  *
1022  * Returns 1 if dir is empty, zero otherwise.
1023  */
1024 int ocfs2_empty_dir(struct inode *inode)
1025 {
1026         int ret;
1027         loff_t start = 0;
1028         struct ocfs2_empty_dir_priv priv;
1029
1030         memset(&priv, 0, sizeof(priv));
1031
1032         ret = ocfs2_dir_foreach(inode, &start, &priv, ocfs2_empty_dir_filldir);
1033         if (ret)
1034                 mlog_errno(ret);
1035
1036         if (!priv.seen_dot || !priv.seen_dot_dot) {
1037                 mlog(ML_ERROR, "bad directory (dir #%llu) - no `.' or `..'\n",
1038                      (unsigned long long)OCFS2_I(inode)->ip_blkno);
1039                 /*
1040                  * XXX: Is it really safe to allow an unlink to continue?
1041                  */
1042                 return 1;
1043         }
1044
1045         return !priv.seen_other;
1046 }
1047
1048 static void ocfs2_fill_initial_dirents(struct inode *inode,
1049                                        struct inode *parent,
1050                                        char *start, unsigned int size)
1051 {
1052         struct ocfs2_dir_entry *de = (struct ocfs2_dir_entry *)start;
1053
1054         de->inode = cpu_to_le64(OCFS2_I(inode)->ip_blkno);
1055         de->name_len = 1;
1056         de->rec_len =
1057                 cpu_to_le16(OCFS2_DIR_REC_LEN(de->name_len));
1058         strcpy(de->name, ".");
1059         ocfs2_set_de_type(de, S_IFDIR);
1060
1061         de = (struct ocfs2_dir_entry *) ((char *)de + le16_to_cpu(de->rec_len));
1062         de->inode = cpu_to_le64(OCFS2_I(parent)->ip_blkno);
1063         de->rec_len = cpu_to_le16(size - OCFS2_DIR_REC_LEN(1));
1064         de->name_len = 2;
1065         strcpy(de->name, "..");
1066         ocfs2_set_de_type(de, S_IFDIR);
1067 }
1068
1069 /*
1070  * This works together with code in ocfs2_mknod_locked() which sets
1071  * the inline-data flag and initializes the inline-data section.
1072  */
1073 static int ocfs2_fill_new_dir_id(struct ocfs2_super *osb,
1074                                  handle_t *handle,
1075                                  struct inode *parent,
1076                                  struct inode *inode,
1077                                  struct buffer_head *di_bh)
1078 {
1079         int ret;
1080         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1081         struct ocfs2_inline_data *data = &di->id2.i_data;
1082         unsigned int size = le16_to_cpu(data->id_count);
1083
1084         ret = ocfs2_journal_access(handle, inode, di_bh,
1085                                    OCFS2_JOURNAL_ACCESS_WRITE);
1086         if (ret) {
1087                 mlog_errno(ret);
1088                 goto out;
1089         }
1090
1091         ocfs2_fill_initial_dirents(inode, parent, data->id_data, size);
1092
1093         ocfs2_journal_dirty(handle, di_bh);
1094         if (ret) {
1095                 mlog_errno(ret);
1096                 goto out;
1097         }
1098
1099         i_size_write(inode, size);
1100         inode->i_nlink = 2;
1101         inode->i_blocks = ocfs2_inode_sector_count(inode);
1102
1103         ret = ocfs2_mark_inode_dirty(handle, inode, di_bh);
1104         if (ret < 0)
1105                 mlog_errno(ret);
1106
1107 out:
1108         return ret;
1109 }
1110
1111 static int ocfs2_fill_new_dir_el(struct ocfs2_super *osb,
1112                                  handle_t *handle,
1113                                  struct inode *parent,
1114                                  struct inode *inode,
1115                                  struct buffer_head *fe_bh,
1116                                  struct ocfs2_alloc_context *data_ac)
1117 {
1118         int status;
1119         struct buffer_head *new_bh = NULL;
1120
1121         mlog_entry_void();
1122
1123         status = ocfs2_do_extend_dir(osb->sb, handle, inode, fe_bh,
1124                                      data_ac, NULL, &new_bh);
1125         if (status < 0) {
1126                 mlog_errno(status);
1127                 goto bail;
1128         }
1129
1130         ocfs2_set_new_buffer_uptodate(inode, new_bh);
1131
1132         status = ocfs2_journal_access(handle, inode, new_bh,
1133                                       OCFS2_JOURNAL_ACCESS_CREATE);
1134         if (status < 0) {
1135                 mlog_errno(status);
1136                 goto bail;
1137         }
1138         memset(new_bh->b_data, 0, osb->sb->s_blocksize);
1139
1140         ocfs2_fill_initial_dirents(inode, parent, new_bh->b_data,
1141                                    osb->sb->s_blocksize);
1142
1143         status = ocfs2_journal_dirty(handle, new_bh);
1144         if (status < 0) {
1145                 mlog_errno(status);
1146                 goto bail;
1147         }
1148
1149         i_size_write(inode, inode->i_sb->s_blocksize);
1150         inode->i_nlink = 2;
1151         inode->i_blocks = ocfs2_inode_sector_count(inode);
1152         status = ocfs2_mark_inode_dirty(handle, inode, fe_bh);
1153         if (status < 0) {
1154                 mlog_errno(status);
1155                 goto bail;
1156         }
1157
1158         status = 0;
1159 bail:
1160         brelse(new_bh);
1161
1162         mlog_exit(status);
1163         return status;
1164 }
1165
1166 int ocfs2_fill_new_dir(struct ocfs2_super *osb,
1167                        handle_t *handle,
1168                        struct inode *parent,
1169                        struct inode *inode,
1170                        struct buffer_head *fe_bh,
1171                        struct ocfs2_alloc_context *data_ac)
1172 {
1173         BUG_ON(!ocfs2_supports_inline_data(osb) && data_ac == NULL);
1174
1175         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
1176                 return ocfs2_fill_new_dir_id(osb, handle, parent, inode, fe_bh);
1177
1178         return ocfs2_fill_new_dir_el(osb, handle, parent, inode, fe_bh,
1179                                      data_ac);
1180 }
1181
1182 static void ocfs2_expand_last_dirent(char *start, unsigned int old_size,
1183                                      unsigned int new_size)
1184 {
1185         struct ocfs2_dir_entry *de;
1186         struct ocfs2_dir_entry *prev_de;
1187         char *de_buf, *limit;
1188         unsigned int bytes = new_size - old_size;
1189
1190         limit = start + old_size;
1191         de_buf = start;
1192         de = (struct ocfs2_dir_entry *)de_buf;
1193         do {
1194                 prev_de = de;
1195                 de_buf += le16_to_cpu(de->rec_len);
1196                 de = (struct ocfs2_dir_entry *)de_buf;
1197         } while (de_buf < limit);
1198
1199         le16_add_cpu(&prev_de->rec_len, bytes);
1200 }
1201
1202 /*
1203  * We allocate enough clusters to fulfill "blocks_wanted", but set
1204  * i_size to exactly one block. Ocfs2_extend_dir() will handle the
1205  * rest automatically for us.
1206  *
1207  * *first_block_bh is a pointer to the 1st data block allocated to the
1208  *  directory.
1209  */
1210 static int ocfs2_expand_inline_dir(struct inode *dir, struct buffer_head *di_bh,
1211                                    unsigned int blocks_wanted,
1212                                    struct buffer_head **first_block_bh)
1213 {
1214         u32 alloc, bit_off, len;
1215         struct super_block *sb = dir->i_sb;
1216         int ret, credits = ocfs2_inline_to_extents_credits(sb);
1217         u64 blkno, bytes = blocks_wanted << sb->s_blocksize_bits;
1218         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
1219         struct ocfs2_inode_info *oi = OCFS2_I(dir);
1220         struct ocfs2_alloc_context *data_ac;
1221         struct buffer_head *dirdata_bh = NULL;
1222         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1223         handle_t *handle;
1224         struct ocfs2_extent_tree et;
1225         int did_quota = 0;
1226
1227         ocfs2_init_dinode_extent_tree(&et, dir, di_bh);
1228
1229         alloc = ocfs2_clusters_for_bytes(sb, bytes);
1230
1231         /*
1232          * We should never need more than 2 clusters for this -
1233          * maximum dirent size is far less than one block. In fact,
1234          * the only time we'd need more than one cluster is if
1235          * blocksize == clustersize and the dirent won't fit in the
1236          * extra space that the expansion to a single block gives. As
1237          * of today, that only happens on 4k/4k file systems.
1238          */
1239         BUG_ON(alloc > 2);
1240
1241         ret = ocfs2_reserve_clusters(osb, alloc, &data_ac);
1242         if (ret) {
1243                 mlog_errno(ret);
1244                 goto out;
1245         }
1246
1247         down_write(&oi->ip_alloc_sem);
1248
1249         /*
1250          * Prepare for worst case allocation scenario of two separate
1251          * extents.
1252          */
1253         if (alloc == 2)
1254                 credits += OCFS2_SUBALLOC_ALLOC;
1255
1256         handle = ocfs2_start_trans(osb, credits);
1257         if (IS_ERR(handle)) {
1258                 ret = PTR_ERR(handle);
1259                 mlog_errno(ret);
1260                 goto out_sem;
1261         }
1262
1263         if (vfs_dq_alloc_space_nodirty(dir,
1264                                 ocfs2_clusters_to_bytes(osb->sb, alloc))) {
1265                 ret = -EDQUOT;
1266                 goto out_commit;
1267         }
1268         did_quota = 1;
1269         /*
1270          * Try to claim as many clusters as the bitmap can give though
1271          * if we only get one now, that's enough to continue. The rest
1272          * will be claimed after the conversion to extents.
1273          */
1274         ret = ocfs2_claim_clusters(osb, handle, data_ac, 1, &bit_off, &len);
1275         if (ret) {
1276                 mlog_errno(ret);
1277                 goto out_commit;
1278         }
1279
1280         /*
1281          * Operations are carefully ordered so that we set up the new
1282          * data block first. The conversion from inline data to
1283          * extents follows.
1284          */
1285         blkno = ocfs2_clusters_to_blocks(dir->i_sb, bit_off);
1286         dirdata_bh = sb_getblk(sb, blkno);
1287         if (!dirdata_bh) {
1288                 ret = -EIO;
1289                 mlog_errno(ret);
1290                 goto out_commit;
1291         }
1292
1293         ocfs2_set_new_buffer_uptodate(dir, dirdata_bh);
1294
1295         ret = ocfs2_journal_access(handle, dir, dirdata_bh,
1296                                    OCFS2_JOURNAL_ACCESS_CREATE);
1297         if (ret) {
1298                 mlog_errno(ret);
1299                 goto out_commit;
1300         }
1301
1302         memcpy(dirdata_bh->b_data, di->id2.i_data.id_data, i_size_read(dir));
1303         memset(dirdata_bh->b_data + i_size_read(dir), 0,
1304                sb->s_blocksize - i_size_read(dir));
1305         ocfs2_expand_last_dirent(dirdata_bh->b_data, i_size_read(dir),
1306                                  sb->s_blocksize);
1307
1308         ret = ocfs2_journal_dirty(handle, dirdata_bh);
1309         if (ret) {
1310                 mlog_errno(ret);
1311                 goto out_commit;
1312         }
1313
1314         /*
1315          * Set extent, i_size, etc on the directory. After this, the
1316          * inode should contain the same exact dirents as before and
1317          * be fully accessible from system calls.
1318          *
1319          * We let the later dirent insert modify c/mtime - to the user
1320          * the data hasn't changed.
1321          */
1322         ret = ocfs2_journal_access(handle, dir, di_bh,
1323                                    OCFS2_JOURNAL_ACCESS_CREATE);
1324         if (ret) {
1325                 mlog_errno(ret);
1326                 goto out_commit;
1327         }
1328
1329         spin_lock(&oi->ip_lock);
1330         oi->ip_dyn_features &= ~OCFS2_INLINE_DATA_FL;
1331         di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
1332         spin_unlock(&oi->ip_lock);
1333
1334         ocfs2_dinode_new_extent_list(dir, di);
1335
1336         i_size_write(dir, sb->s_blocksize);
1337         dir->i_mtime = dir->i_ctime = CURRENT_TIME;
1338
1339         di->i_size = cpu_to_le64(sb->s_blocksize);
1340         di->i_ctime = di->i_mtime = cpu_to_le64(dir->i_ctime.tv_sec);
1341         di->i_ctime_nsec = di->i_mtime_nsec = cpu_to_le32(dir->i_ctime.tv_nsec);
1342
1343         /*
1344          * This should never fail as our extent list is empty and all
1345          * related blocks have been journaled already.
1346          */
1347         ret = ocfs2_insert_extent(osb, handle, dir, &et, 0, blkno, len,
1348                                   0, NULL);
1349         if (ret) {
1350                 mlog_errno(ret);
1351                 goto out_commit;
1352         }
1353
1354         /*
1355          * Set i_blocks after the extent insert for the most up to
1356          * date ip_clusters value.
1357          */
1358         dir->i_blocks = ocfs2_inode_sector_count(dir);
1359
1360         ret = ocfs2_journal_dirty(handle, di_bh);
1361         if (ret) {
1362                 mlog_errno(ret);
1363                 goto out_commit;
1364         }
1365
1366         /*
1367          * We asked for two clusters, but only got one in the 1st
1368          * pass. Claim the 2nd cluster as a separate extent.
1369          */
1370         if (alloc > len) {
1371                 ret = ocfs2_claim_clusters(osb, handle, data_ac, 1, &bit_off,
1372                                            &len);
1373                 if (ret) {
1374                         mlog_errno(ret);
1375                         goto out_commit;
1376                 }
1377                 blkno = ocfs2_clusters_to_blocks(dir->i_sb, bit_off);
1378
1379                 ret = ocfs2_insert_extent(osb, handle, dir, &et, 1,
1380                                           blkno, len, 0, NULL);
1381                 if (ret) {
1382                         mlog_errno(ret);
1383                         goto out_commit;
1384                 }
1385         }
1386
1387         *first_block_bh = dirdata_bh;
1388         dirdata_bh = NULL;
1389
1390 out_commit:
1391         if (ret < 0 && did_quota)
1392                 vfs_dq_free_space_nodirty(dir,
1393                         ocfs2_clusters_to_bytes(osb->sb, 2));
1394         ocfs2_commit_trans(osb, handle);
1395
1396 out_sem:
1397         up_write(&oi->ip_alloc_sem);
1398
1399 out:
1400         if (data_ac)
1401                 ocfs2_free_alloc_context(data_ac);
1402
1403         brelse(dirdata_bh);
1404
1405         return ret;
1406 }
1407
1408 /* returns a bh of the 1st new block in the allocation. */
1409 static int ocfs2_do_extend_dir(struct super_block *sb,
1410                                handle_t *handle,
1411                                struct inode *dir,
1412                                struct buffer_head *parent_fe_bh,
1413                                struct ocfs2_alloc_context *data_ac,
1414                                struct ocfs2_alloc_context *meta_ac,
1415                                struct buffer_head **new_bh)
1416 {
1417         int status;
1418         int extend, did_quota = 0;
1419         u64 p_blkno, v_blkno;
1420
1421         spin_lock(&OCFS2_I(dir)->ip_lock);
1422         extend = (i_size_read(dir) == ocfs2_clusters_to_bytes(sb, OCFS2_I(dir)->ip_clusters));
1423         spin_unlock(&OCFS2_I(dir)->ip_lock);
1424
1425         if (extend) {
1426                 u32 offset = OCFS2_I(dir)->ip_clusters;
1427
1428                 if (vfs_dq_alloc_space_nodirty(dir,
1429                                         ocfs2_clusters_to_bytes(sb, 1))) {
1430                         status = -EDQUOT;
1431                         goto bail;
1432                 }
1433                 did_quota = 1;
1434
1435                 status = ocfs2_add_inode_data(OCFS2_SB(sb), dir, &offset,
1436                                               1, 0, parent_fe_bh, handle,
1437                                               data_ac, meta_ac, NULL);
1438                 BUG_ON(status == -EAGAIN);
1439                 if (status < 0) {
1440                         mlog_errno(status);
1441                         goto bail;
1442                 }
1443         }
1444
1445         v_blkno = ocfs2_blocks_for_bytes(sb, i_size_read(dir));
1446         status = ocfs2_extent_map_get_blocks(dir, v_blkno, &p_blkno, NULL, NULL);
1447         if (status < 0) {
1448                 mlog_errno(status);
1449                 goto bail;
1450         }
1451
1452         *new_bh = sb_getblk(sb, p_blkno);
1453         if (!*new_bh) {
1454                 status = -EIO;
1455                 mlog_errno(status);
1456                 goto bail;
1457         }
1458         status = 0;
1459 bail:
1460         if (did_quota && status < 0)
1461                 vfs_dq_free_space_nodirty(dir, ocfs2_clusters_to_bytes(sb, 1));
1462         mlog_exit(status);
1463         return status;
1464 }
1465
1466 /*
1467  * Assumes you already have a cluster lock on the directory.
1468  *
1469  * 'blocks_wanted' is only used if we have an inline directory which
1470  * is to be turned into an extent based one. The size of the dirent to
1471  * insert might be larger than the space gained by growing to just one
1472  * block, so we may have to grow the inode by two blocks in that case.
1473  */
1474 static int ocfs2_extend_dir(struct ocfs2_super *osb,
1475                             struct inode *dir,
1476                             struct buffer_head *parent_fe_bh,
1477                             unsigned int blocks_wanted,
1478                             struct buffer_head **new_de_bh)
1479 {
1480         int status = 0;
1481         int credits, num_free_extents, drop_alloc_sem = 0;
1482         loff_t dir_i_size;
1483         struct ocfs2_dinode *fe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
1484         struct ocfs2_extent_list *el = &fe->id2.i_list;
1485         struct ocfs2_alloc_context *data_ac = NULL;
1486         struct ocfs2_alloc_context *meta_ac = NULL;
1487         handle_t *handle = NULL;
1488         struct buffer_head *new_bh = NULL;
1489         struct ocfs2_dir_entry * de;
1490         struct super_block *sb = osb->sb;
1491         struct ocfs2_extent_tree et;
1492
1493         mlog_entry_void();
1494
1495         if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1496                 status = ocfs2_expand_inline_dir(dir, parent_fe_bh,
1497                                                  blocks_wanted, &new_bh);
1498                 if (status) {
1499                         mlog_errno(status);
1500                         goto bail;
1501                 }
1502
1503                 if (blocks_wanted == 1) {
1504                         /*
1505                          * If the new dirent will fit inside the space
1506                          * created by pushing out to one block, then
1507                          * we can complete the operation
1508                          * here. Otherwise we have to expand i_size
1509                          * and format the 2nd block below.
1510                          */
1511                         BUG_ON(new_bh == NULL);
1512                         goto bail_bh;
1513                 }
1514
1515                 /*
1516                  * Get rid of 'new_bh' - we want to format the 2nd
1517                  * data block and return that instead.
1518                  */
1519                 brelse(new_bh);
1520                 new_bh = NULL;
1521
1522                 dir_i_size = i_size_read(dir);
1523                 credits = OCFS2_SIMPLE_DIR_EXTEND_CREDITS;
1524                 goto do_extend;
1525         }
1526
1527         dir_i_size = i_size_read(dir);
1528         mlog(0, "extending dir %llu (i_size = %lld)\n",
1529              (unsigned long long)OCFS2_I(dir)->ip_blkno, dir_i_size);
1530
1531         /* dir->i_size is always block aligned. */
1532         spin_lock(&OCFS2_I(dir)->ip_lock);
1533         if (dir_i_size == ocfs2_clusters_to_bytes(sb, OCFS2_I(dir)->ip_clusters)) {
1534                 spin_unlock(&OCFS2_I(dir)->ip_lock);
1535                 ocfs2_init_dinode_extent_tree(&et, dir, parent_fe_bh);
1536                 num_free_extents = ocfs2_num_free_extents(osb, dir, &et);
1537                 if (num_free_extents < 0) {
1538                         status = num_free_extents;
1539                         mlog_errno(status);
1540                         goto bail;
1541                 }
1542
1543                 if (!num_free_extents) {
1544                         status = ocfs2_reserve_new_metadata(osb, el, &meta_ac);
1545                         if (status < 0) {
1546                                 if (status != -ENOSPC)
1547                                         mlog_errno(status);
1548                                 goto bail;
1549                         }
1550                 }
1551
1552                 status = ocfs2_reserve_clusters(osb, 1, &data_ac);
1553                 if (status < 0) {
1554                         if (status != -ENOSPC)
1555                                 mlog_errno(status);
1556                         goto bail;
1557                 }
1558
1559                 credits = ocfs2_calc_extend_credits(sb, el, 1);
1560         } else {
1561                 spin_unlock(&OCFS2_I(dir)->ip_lock);
1562                 credits = OCFS2_SIMPLE_DIR_EXTEND_CREDITS;
1563         }
1564
1565 do_extend:
1566         down_write(&OCFS2_I(dir)->ip_alloc_sem);
1567         drop_alloc_sem = 1;
1568
1569         handle = ocfs2_start_trans(osb, credits);
1570         if (IS_ERR(handle)) {
1571                 status = PTR_ERR(handle);
1572                 handle = NULL;
1573                 mlog_errno(status);
1574                 goto bail;
1575         }
1576
1577         status = ocfs2_do_extend_dir(osb->sb, handle, dir, parent_fe_bh,
1578                                      data_ac, meta_ac, &new_bh);
1579         if (status < 0) {
1580                 mlog_errno(status);
1581                 goto bail;
1582         }
1583
1584         ocfs2_set_new_buffer_uptodate(dir, new_bh);
1585
1586         status = ocfs2_journal_access(handle, dir, new_bh,
1587                                       OCFS2_JOURNAL_ACCESS_CREATE);
1588         if (status < 0) {
1589                 mlog_errno(status);
1590                 goto bail;
1591         }
1592         memset(new_bh->b_data, 0, sb->s_blocksize);
1593         de = (struct ocfs2_dir_entry *) new_bh->b_data;
1594         de->inode = 0;
1595         de->rec_len = cpu_to_le16(sb->s_blocksize);
1596         status = ocfs2_journal_dirty(handle, new_bh);
1597         if (status < 0) {
1598                 mlog_errno(status);
1599                 goto bail;
1600         }
1601
1602         dir_i_size += dir->i_sb->s_blocksize;
1603         i_size_write(dir, dir_i_size);
1604         dir->i_blocks = ocfs2_inode_sector_count(dir);
1605         status = ocfs2_mark_inode_dirty(handle, dir, parent_fe_bh);
1606         if (status < 0) {
1607                 mlog_errno(status);
1608                 goto bail;
1609         }
1610
1611 bail_bh:
1612         *new_de_bh = new_bh;
1613         get_bh(*new_de_bh);
1614 bail:
1615         if (drop_alloc_sem)
1616                 up_write(&OCFS2_I(dir)->ip_alloc_sem);
1617         if (handle)
1618                 ocfs2_commit_trans(osb, handle);
1619
1620         if (data_ac)
1621                 ocfs2_free_alloc_context(data_ac);
1622         if (meta_ac)
1623                 ocfs2_free_alloc_context(meta_ac);
1624
1625         brelse(new_bh);
1626
1627         mlog_exit(status);
1628         return status;
1629 }
1630
1631 static int ocfs2_find_dir_space_id(struct inode *dir, struct buffer_head *di_bh,
1632                                    const char *name, int namelen,
1633                                    struct buffer_head **ret_de_bh,
1634                                    unsigned int *blocks_wanted)
1635 {
1636         int ret;
1637         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1638         struct ocfs2_dir_entry *de, *last_de = NULL;
1639         char *de_buf, *limit;
1640         unsigned long offset = 0;
1641         unsigned int rec_len, new_rec_len;
1642
1643         de_buf = di->id2.i_data.id_data;
1644         limit = de_buf + i_size_read(dir);
1645         rec_len = OCFS2_DIR_REC_LEN(namelen);
1646
1647         while (de_buf < limit) {
1648                 de = (struct ocfs2_dir_entry *)de_buf;
1649
1650                 if (!ocfs2_check_dir_entry(dir, de, di_bh, offset)) {
1651                         ret = -ENOENT;
1652                         goto out;
1653                 }
1654                 if (ocfs2_match(namelen, name, de)) {
1655                         ret = -EEXIST;
1656                         goto out;
1657                 }
1658                 if (ocfs2_dirent_would_fit(de, rec_len)) {
1659                         /* Ok, we found a spot. Return this bh and let
1660                          * the caller actually fill it in. */
1661                         *ret_de_bh = di_bh;
1662                         get_bh(*ret_de_bh);
1663                         ret = 0;
1664                         goto out;
1665                 }
1666
1667                 last_de = de;
1668                 de_buf += le16_to_cpu(de->rec_len);
1669                 offset += le16_to_cpu(de->rec_len);
1670         }
1671
1672         /*
1673          * We're going to require expansion of the directory - figure
1674          * out how many blocks we'll need so that a place for the
1675          * dirent can be found.
1676          */
1677         *blocks_wanted = 1;
1678         new_rec_len = le16_to_cpu(last_de->rec_len) + (dir->i_sb->s_blocksize - i_size_read(dir));
1679         if (new_rec_len < (rec_len + OCFS2_DIR_REC_LEN(last_de->name_len)))
1680                 *blocks_wanted = 2;
1681
1682         ret = -ENOSPC;
1683 out:
1684         return ret;
1685 }
1686
1687 static int ocfs2_find_dir_space_el(struct inode *dir, const char *name,
1688                                    int namelen, struct buffer_head **ret_de_bh)
1689 {
1690         unsigned long offset;
1691         struct buffer_head *bh = NULL;
1692         unsigned short rec_len;
1693         struct ocfs2_dir_entry *de;
1694         struct super_block *sb = dir->i_sb;
1695         int status;
1696
1697         status = ocfs2_read_dir_block(dir, 0, &bh, 0);
1698         if (status) {
1699                 mlog_errno(status);
1700                 goto bail;
1701         }
1702
1703         rec_len = OCFS2_DIR_REC_LEN(namelen);
1704         offset = 0;
1705         de = (struct ocfs2_dir_entry *) bh->b_data;
1706         while (1) {
1707                 if ((char *)de >= sb->s_blocksize + bh->b_data) {
1708                         brelse(bh);
1709                         bh = NULL;
1710
1711                         if (i_size_read(dir) <= offset) {
1712                                 /*
1713                                  * Caller will have to expand this
1714                                  * directory.
1715                                  */
1716                                 status = -ENOSPC;
1717                                 goto bail;
1718                         }
1719                         status = ocfs2_read_dir_block(dir,
1720                                              offset >> sb->s_blocksize_bits,
1721                                              &bh, 0);
1722                         if (status) {
1723                                 mlog_errno(status);
1724                                 goto bail;
1725                         }
1726                         /* move to next block */
1727                         de = (struct ocfs2_dir_entry *) bh->b_data;
1728                 }
1729                 if (!ocfs2_check_dir_entry(dir, de, bh, offset)) {
1730                         status = -ENOENT;
1731                         goto bail;
1732                 }
1733                 if (ocfs2_match(namelen, name, de)) {
1734                         status = -EEXIST;
1735                         goto bail;
1736                 }
1737                 if (ocfs2_dirent_would_fit(de, rec_len)) {
1738                         /* Ok, we found a spot. Return this bh and let
1739                          * the caller actually fill it in. */
1740                         *ret_de_bh = bh;
1741                         get_bh(*ret_de_bh);
1742                         status = 0;
1743                         goto bail;
1744                 }
1745                 offset += le16_to_cpu(de->rec_len);
1746                 de = (struct ocfs2_dir_entry *)((char *) de + le16_to_cpu(de->rec_len));
1747         }
1748
1749         status = 0;
1750 bail:
1751         brelse(bh);
1752
1753         mlog_exit(status);
1754         return status;
1755 }
1756
1757 int ocfs2_prepare_dir_for_insert(struct ocfs2_super *osb,
1758                                  struct inode *dir,
1759                                  struct buffer_head *parent_fe_bh,
1760                                  const char *name,
1761                                  int namelen,
1762                                  struct buffer_head **ret_de_bh)
1763 {
1764         int ret;
1765         unsigned int blocks_wanted = 1;
1766         struct buffer_head *bh = NULL;
1767
1768         mlog(0, "getting ready to insert namelen %d into dir %llu\n",
1769              namelen, (unsigned long long)OCFS2_I(dir)->ip_blkno);
1770
1771         *ret_de_bh = NULL;
1772
1773         if (!namelen) {
1774                 ret = -EINVAL;
1775                 mlog_errno(ret);
1776                 goto out;
1777         }
1778
1779         if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1780                 ret = ocfs2_find_dir_space_id(dir, parent_fe_bh, name,
1781                                               namelen, &bh, &blocks_wanted);
1782         } else
1783                 ret = ocfs2_find_dir_space_el(dir, name, namelen, &bh);
1784
1785         if (ret && ret != -ENOSPC) {
1786                 mlog_errno(ret);
1787                 goto out;
1788         }
1789
1790         if (ret == -ENOSPC) {
1791                 /*
1792                  * We have to expand the directory to add this name.
1793                  */
1794                 BUG_ON(bh);
1795
1796                 ret = ocfs2_extend_dir(osb, dir, parent_fe_bh, blocks_wanted,
1797                                        &bh);
1798                 if (ret) {
1799                         if (ret != -ENOSPC)
1800                                 mlog_errno(ret);
1801                         goto out;
1802                 }
1803
1804                 BUG_ON(!bh);
1805         }
1806
1807         *ret_de_bh = bh;
1808         bh = NULL;
1809 out:
1810         brelse(bh);
1811         return ret;
1812 }