blob: de13e919cd8106fac1012c162699cc5604da90f4 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/fs/ext3/namei.c
3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/fs/minix/namei.c
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 *
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
17 * Directory entry file type support and forward compatibility hooks
Dave Kleikampe9ad5622006-09-27 01:49:35 -070018 * for B-tree directories by Theodore Ts'o (tytso@mit.edu), 1998
Linus Torvalds1da177e2005-04-16 15:20:36 -070019 * Hash Tree Directory indexing (c)
Dave Kleikampe9ad5622006-09-27 01:49:35 -070020 * Daniel Phillips, 2001
Linus Torvalds1da177e2005-04-16 15:20:36 -070021 * Hash Tree Directory indexing porting
Dave Kleikampe9ad5622006-09-27 01:49:35 -070022 * Christopher Li, 2002
Linus Torvalds1da177e2005-04-16 15:20:36 -070023 * Hash Tree Directory indexing cleanup
Dave Kleikampe9ad5622006-09-27 01:49:35 -070024 * Theodore Ts'o, 2002
Linus Torvalds1da177e2005-04-16 15:20:36 -070025 */
26
27#include <linux/fs.h>
28#include <linux/pagemap.h>
29#include <linux/jbd.h>
30#include <linux/time.h>
31#include <linux/ext3_fs.h>
32#include <linux/ext3_jbd.h>
33#include <linux/fcntl.h>
34#include <linux/stat.h>
35#include <linux/string.h>
36#include <linux/quotaops.h>
37#include <linux/buffer_head.h>
Jens Axboecaa38fb2006-07-23 01:41:26 +020038#include <linux/bio.h>
Ben Dooks381be2542005-10-30 15:02:56 -080039
40#include "namei.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070041#include "xattr.h"
42#include "acl.h"
43
44/*
45 * define how far ahead to read directories while searching them.
46 */
47#define NAMEI_RA_CHUNKS 2
48#define NAMEI_RA_BLOCKS 4
49#define NAMEI_RA_SIZE (NAMEI_RA_CHUNKS * NAMEI_RA_BLOCKS)
50#define NAMEI_RA_INDEX(c,b) (((c) * NAMEI_RA_BLOCKS) + (b))
51
52static struct buffer_head *ext3_append(handle_t *handle,
53 struct inode *inode,
54 u32 *block, int *err)
55{
56 struct buffer_head *bh;
57
58 *block = inode->i_size >> inode->i_sb->s_blocksize_bits;
59
Akinobu Mita33575f82008-04-28 02:16:08 -070060 bh = ext3_bread(handle, inode, *block, 1, err);
61 if (bh) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070062 inode->i_size += inode->i_sb->s_blocksize;
63 EXT3_I(inode)->i_disksize = inode->i_size;
Akinobu Mita33575f82008-04-28 02:16:08 -070064 *err = ext3_journal_get_write_access(handle, bh);
65 if (*err) {
66 brelse(bh);
67 bh = NULL;
68 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 }
70 return bh;
71}
72
73#ifndef assert
74#define assert(test) J_ASSERT(test)
75#endif
76
77#ifndef swap
78#define swap(x, y) do { typeof(x) z = x; x = y; y = z; } while (0)
79#endif
80
81#ifdef DX_DEBUG
82#define dxtrace(command) command
83#else
Mingming Caoae6ddcc2006-09-27 01:49:27 -070084#define dxtrace(command)
Linus Torvalds1da177e2005-04-16 15:20:36 -070085#endif
86
87struct fake_dirent
88{
89 __le32 inode;
90 __le16 rec_len;
91 u8 name_len;
92 u8 file_type;
93};
94
95struct dx_countlimit
96{
97 __le16 limit;
98 __le16 count;
99};
100
101struct dx_entry
102{
103 __le32 hash;
104 __le32 block;
105};
106
107/*
108 * dx_root_info is laid out so that if it should somehow get overlaid by a
109 * dirent the two low bits of the hash version will be zero. Therefore, the
110 * hash version mod 4 should never be 0. Sincerely, the paranoia department.
111 */
112
113struct dx_root
114{
115 struct fake_dirent dot;
116 char dot_name[4];
117 struct fake_dirent dotdot;
118 char dotdot_name[4];
119 struct dx_root_info
120 {
121 __le32 reserved_zero;
122 u8 hash_version;
123 u8 info_length; /* 8 */
124 u8 indirect_levels;
125 u8 unused_flags;
126 }
127 info;
128 struct dx_entry entries[0];
129};
130
131struct dx_node
132{
133 struct fake_dirent fake;
134 struct dx_entry entries[0];
135};
136
137
138struct dx_frame
139{
140 struct buffer_head *bh;
141 struct dx_entry *entries;
142 struct dx_entry *at;
143};
144
145struct dx_map_entry
146{
147 u32 hash;
Eric Sandeenef2b02d2007-09-18 22:46:42 -0700148 u16 offs;
149 u16 size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150};
151
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152static inline unsigned dx_get_block (struct dx_entry *entry);
153static void dx_set_block (struct dx_entry *entry, unsigned value);
154static inline unsigned dx_get_hash (struct dx_entry *entry);
155static void dx_set_hash (struct dx_entry *entry, unsigned value);
156static unsigned dx_get_count (struct dx_entry *entries);
157static unsigned dx_get_limit (struct dx_entry *entries);
158static void dx_set_count (struct dx_entry *entries, unsigned value);
159static void dx_set_limit (struct dx_entry *entries, unsigned value);
160static unsigned dx_root_limit (struct inode *dir, unsigned infosize);
161static unsigned dx_node_limit (struct inode *dir);
162static struct dx_frame *dx_probe(struct dentry *dentry,
163 struct inode *dir,
164 struct dx_hash_info *hinfo,
165 struct dx_frame *frame,
166 int *err);
167static void dx_release (struct dx_frame *frames);
168static int dx_make_map (struct ext3_dir_entry_2 *de, int size,
169 struct dx_hash_info *hinfo, struct dx_map_entry map[]);
170static void dx_sort_map(struct dx_map_entry *map, unsigned count);
171static struct ext3_dir_entry_2 *dx_move_dirents (char *from, char *to,
172 struct dx_map_entry *offsets, int count);
173static struct ext3_dir_entry_2* dx_pack_dirents (char *base, int size);
174static void dx_insert_block (struct dx_frame *frame, u32 hash, u32 block);
175static int ext3_htree_next_block(struct inode *dir, __u32 hash,
176 struct dx_frame *frame,
Mingming Caoae6ddcc2006-09-27 01:49:27 -0700177 struct dx_frame *frames,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 __u32 *start_hash);
179static struct buffer_head * ext3_dx_find_entry(struct dentry *dentry,
180 struct ext3_dir_entry_2 **res_dir, int *err);
181static int ext3_dx_add_entry(handle_t *handle, struct dentry *dentry,
182 struct inode *inode);
183
184/*
Jan Kara7c06a8d2007-11-14 17:00:19 -0800185 * p is at least 6 bytes before the end of page
186 */
187static inline struct ext3_dir_entry_2 *
188ext3_next_entry(struct ext3_dir_entry_2 *p)
189{
190 return (struct ext3_dir_entry_2 *)((char *)p +
191 ext3_rec_len_from_disk(p->rec_len));
192}
193
194/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 * Future: use high four bits of block for coalesce-on-delete flags
196 * Mask them off for now.
197 */
198
199static inline unsigned dx_get_block (struct dx_entry *entry)
200{
201 return le32_to_cpu(entry->block) & 0x00ffffff;
202}
203
204static inline void dx_set_block (struct dx_entry *entry, unsigned value)
205{
206 entry->block = cpu_to_le32(value);
207}
208
209static inline unsigned dx_get_hash (struct dx_entry *entry)
210{
211 return le32_to_cpu(entry->hash);
212}
213
214static inline void dx_set_hash (struct dx_entry *entry, unsigned value)
215{
216 entry->hash = cpu_to_le32(value);
217}
218
219static inline unsigned dx_get_count (struct dx_entry *entries)
220{
221 return le16_to_cpu(((struct dx_countlimit *) entries)->count);
222}
223
224static inline unsigned dx_get_limit (struct dx_entry *entries)
225{
226 return le16_to_cpu(((struct dx_countlimit *) entries)->limit);
227}
228
229static inline void dx_set_count (struct dx_entry *entries, unsigned value)
230{
231 ((struct dx_countlimit *) entries)->count = cpu_to_le16(value);
232}
233
234static inline void dx_set_limit (struct dx_entry *entries, unsigned value)
235{
236 ((struct dx_countlimit *) entries)->limit = cpu_to_le16(value);
237}
238
239static inline unsigned dx_root_limit (struct inode *dir, unsigned infosize)
240{
241 unsigned entry_space = dir->i_sb->s_blocksize - EXT3_DIR_REC_LEN(1) -
242 EXT3_DIR_REC_LEN(2) - infosize;
Li Zefan8ef27202008-07-25 01:46:29 -0700243 return entry_space / sizeof(struct dx_entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244}
245
246static inline unsigned dx_node_limit (struct inode *dir)
247{
248 unsigned entry_space = dir->i_sb->s_blocksize - EXT3_DIR_REC_LEN(0);
Li Zefan8ef27202008-07-25 01:46:29 -0700249 return entry_space / sizeof(struct dx_entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250}
251
252/*
253 * Debug
254 */
255#ifdef DX_DEBUG
256static void dx_show_index (char * label, struct dx_entry *entries)
257{
258 int i, n = dx_get_count (entries);
259 printk("%s index ", label);
260 for (i = 0; i < n; i++)
261 {
262 printk("%x->%u ", i? dx_get_hash(entries + i): 0, dx_get_block(entries + i));
263 }
264 printk("\n");
265}
266
267struct stats
Mingming Caoae6ddcc2006-09-27 01:49:27 -0700268{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 unsigned names;
270 unsigned space;
271 unsigned bcount;
272};
273
274static struct stats dx_show_leaf(struct dx_hash_info *hinfo, struct ext3_dir_entry_2 *de,
275 int size, int show_names)
276{
277 unsigned names = 0, space = 0;
278 char *base = (char *) de;
279 struct dx_hash_info h = *hinfo;
280
281 printk("names: ");
282 while ((char *) de < base + size)
283 {
284 if (de->inode)
285 {
286 if (show_names)
287 {
288 int len = de->name_len;
289 char *name = de->name;
290 while (len--) printk("%c", *name++);
291 ext3fs_dirhash(de->name, de->name_len, &h);
292 printk(":%x.%u ", h.hash,
293 ((char *) de - base));
294 }
295 space += EXT3_DIR_REC_LEN(de->name_len);
Dave Kleikampe9ad5622006-09-27 01:49:35 -0700296 names++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 }
Jan Kara7c06a8d2007-11-14 17:00:19 -0800298 de = ext3_next_entry(de);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 }
300 printk("(%i)\n", names);
301 return (struct stats) { names, space, 1 };
302}
303
304struct stats dx_show_entries(struct dx_hash_info *hinfo, struct inode *dir,
305 struct dx_entry *entries, int levels)
306{
307 unsigned blocksize = dir->i_sb->s_blocksize;
308 unsigned count = dx_get_count (entries), names = 0, space = 0, i;
309 unsigned bcount = 0;
310 struct buffer_head *bh;
311 int err;
312 printk("%i indexed blocks...\n", count);
313 for (i = 0; i < count; i++, entries++)
314 {
315 u32 block = dx_get_block(entries), hash = i? dx_get_hash(entries): 0;
316 u32 range = i < count - 1? (dx_get_hash(entries + 1) - hash): ~hash;
317 struct stats stats;
318 printk("%s%3u:%03u hash %8x/%8x ",levels?"":" ", i, block, hash, range);
319 if (!(bh = ext3_bread (NULL,dir, block, 0,&err))) continue;
320 stats = levels?
321 dx_show_entries(hinfo, dir, ((struct dx_node *) bh->b_data)->entries, levels - 1):
322 dx_show_leaf(hinfo, (struct ext3_dir_entry_2 *) bh->b_data, blocksize, 0);
323 names += stats.names;
324 space += stats.space;
325 bcount += stats.bcount;
326 brelse (bh);
327 }
328 if (bcount)
329 printk("%snames %u, fullness %u (%u%%)\n", levels?"":" ",
330 names, space/bcount,(space/bcount)*100/blocksize);
331 return (struct stats) { names, space, bcount};
332}
333#endif /* DX_DEBUG */
334
335/*
336 * Probe for a directory leaf block to search.
337 *
338 * dx_probe can return ERR_BAD_DX_DIR, which means there was a format
339 * error in the directory index, and the caller should fall back to
340 * searching the directory normally. The callers of dx_probe **MUST**
341 * check for this error code, and make sure it never gets reflected
342 * back to userspace.
343 */
344static struct dx_frame *
345dx_probe(struct dentry *dentry, struct inode *dir,
346 struct dx_hash_info *hinfo, struct dx_frame *frame_in, int *err)
347{
348 unsigned count, indirect;
349 struct dx_entry *at, *entries, *p, *q, *m;
350 struct dx_root *root;
351 struct buffer_head *bh;
352 struct dx_frame *frame = frame_in;
353 u32 hash;
354
355 frame->bh = NULL;
356 if (dentry)
357 dir = dentry->d_parent->d_inode;
358 if (!(bh = ext3_bread (NULL,dir, 0, 0, err)))
359 goto fail;
360 root = (struct dx_root *) bh->b_data;
361 if (root->info.hash_version != DX_HASH_TEA &&
362 root->info.hash_version != DX_HASH_HALF_MD4 &&
363 root->info.hash_version != DX_HASH_LEGACY) {
Harvey Harrisone05b6b52008-04-28 02:16:15 -0700364 ext3_warning(dir->i_sb, __func__,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365 "Unrecognised inode hash code %d",
366 root->info.hash_version);
367 brelse(bh);
368 *err = ERR_BAD_DX_DIR;
369 goto fail;
370 }
371 hinfo->hash_version = root->info.hash_version;
372 hinfo->seed = EXT3_SB(dir->i_sb)->s_hash_seed;
373 if (dentry)
374 ext3fs_dirhash(dentry->d_name.name, dentry->d_name.len, hinfo);
375 hash = hinfo->hash;
376
377 if (root->info.unused_flags & 1) {
Harvey Harrisone05b6b52008-04-28 02:16:15 -0700378 ext3_warning(dir->i_sb, __func__,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379 "Unimplemented inode hash flags: %#06x",
380 root->info.unused_flags);
381 brelse(bh);
382 *err = ERR_BAD_DX_DIR;
383 goto fail;
384 }
385
386 if ((indirect = root->info.indirect_levels) > 1) {
Harvey Harrisone05b6b52008-04-28 02:16:15 -0700387 ext3_warning(dir->i_sb, __func__,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 "Unimplemented inode hash depth: %#06x",
389 root->info.indirect_levels);
390 brelse(bh);
391 *err = ERR_BAD_DX_DIR;
392 goto fail;
393 }
394
395 entries = (struct dx_entry *) (((char *)&root->info) +
396 root->info.info_length);
Eric Sandeen3d82aba2007-09-18 22:46:38 -0700397
398 if (dx_get_limit(entries) != dx_root_limit(dir,
399 root->info.info_length)) {
Harvey Harrisone05b6b52008-04-28 02:16:15 -0700400 ext3_warning(dir->i_sb, __func__,
Eric Sandeen3d82aba2007-09-18 22:46:38 -0700401 "dx entry: limit != root limit");
402 brelse(bh);
403 *err = ERR_BAD_DX_DIR;
404 goto fail;
405 }
406
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 dxtrace (printk("Look up %x", hash));
408 while (1)
409 {
410 count = dx_get_count(entries);
Eric Sandeen3d82aba2007-09-18 22:46:38 -0700411 if (!count || count > dx_get_limit(entries)) {
Harvey Harrisone05b6b52008-04-28 02:16:15 -0700412 ext3_warning(dir->i_sb, __func__,
Eric Sandeen3d82aba2007-09-18 22:46:38 -0700413 "dx entry: no count or count > limit");
414 brelse(bh);
415 *err = ERR_BAD_DX_DIR;
416 goto fail2;
417 }
418
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 p = entries + 1;
420 q = entries + count - 1;
421 while (p <= q)
422 {
423 m = p + (q - p)/2;
424 dxtrace(printk("."));
425 if (dx_get_hash(m) > hash)
426 q = m - 1;
427 else
428 p = m + 1;
429 }
430
431 if (0) // linear search cross check
432 {
433 unsigned n = count - 1;
434 at = entries;
435 while (n--)
436 {
437 dxtrace(printk(","));
438 if (dx_get_hash(++at) > hash)
439 {
440 at--;
441 break;
442 }
443 }
444 assert (at == p - 1);
445 }
446
447 at = p - 1;
448 dxtrace(printk(" %x->%u\n", at == entries? 0: dx_get_hash(at), dx_get_block(at)));
449 frame->bh = bh;
450 frame->entries = entries;
451 frame->at = at;
452 if (!indirect--) return frame;
453 if (!(bh = ext3_bread (NULL,dir, dx_get_block(at), 0, err)))
454 goto fail2;
455 at = entries = ((struct dx_node *) bh->b_data)->entries;
Eric Sandeen3d82aba2007-09-18 22:46:38 -0700456 if (dx_get_limit(entries) != dx_node_limit (dir)) {
Harvey Harrisone05b6b52008-04-28 02:16:15 -0700457 ext3_warning(dir->i_sb, __func__,
Eric Sandeen3d82aba2007-09-18 22:46:38 -0700458 "dx entry: limit != node limit");
459 brelse(bh);
460 *err = ERR_BAD_DX_DIR;
461 goto fail2;
462 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 frame++;
Eric Sandeen3d82aba2007-09-18 22:46:38 -0700464 frame->bh = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465 }
466fail2:
467 while (frame >= frame_in) {
468 brelse(frame->bh);
469 frame--;
470 }
471fail:
Eric Sandeen3d82aba2007-09-18 22:46:38 -0700472 if (*err == ERR_BAD_DX_DIR)
Harvey Harrisone05b6b52008-04-28 02:16:15 -0700473 ext3_warning(dir->i_sb, __func__,
Eric Sandeen3d82aba2007-09-18 22:46:38 -0700474 "Corrupt dir inode %ld, running e2fsck is "
475 "recommended.", dir->i_ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 return NULL;
477}
478
479static void dx_release (struct dx_frame *frames)
480{
481 if (frames[0].bh == NULL)
482 return;
483
484 if (((struct dx_root *) frames[0].bh->b_data)->info.indirect_levels)
485 brelse(frames[1].bh);
486 brelse(frames[0].bh);
487}
488
489/*
490 * This function increments the frame pointer to search the next leaf
491 * block, and reads in the necessary intervening nodes if the search
492 * should be necessary. Whether or not the search is necessary is
493 * controlled by the hash parameter. If the hash value is even, then
494 * the search is only continued if the next block starts with that
495 * hash value. This is used if we are searching for a specific file.
496 *
497 * If the hash value is HASH_NB_ALWAYS, then always go to the next block.
498 *
499 * This function returns 1 if the caller should continue to search,
500 * or 0 if it should not. If there is an error reading one of the
501 * index blocks, it will a negative error code.
502 *
503 * If start_hash is non-null, it will be filled in with the starting
504 * hash of the next page.
505 */
506static int ext3_htree_next_block(struct inode *dir, __u32 hash,
507 struct dx_frame *frame,
Mingming Caoae6ddcc2006-09-27 01:49:27 -0700508 struct dx_frame *frames,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509 __u32 *start_hash)
510{
511 struct dx_frame *p;
512 struct buffer_head *bh;
513 int err, num_frames = 0;
514 __u32 bhash;
515
516 p = frame;
517 /*
518 * Find the next leaf page by incrementing the frame pointer.
519 * If we run out of entries in the interior node, loop around and
520 * increment pointer in the parent node. When we break out of
521 * this loop, num_frames indicates the number of interior
522 * nodes need to be read.
523 */
524 while (1) {
525 if (++(p->at) < p->entries + dx_get_count(p->entries))
526 break;
527 if (p == frames)
528 return 0;
529 num_frames++;
530 p--;
531 }
532
533 /*
534 * If the hash is 1, then continue only if the next page has a
535 * continuation hash of any value. This is used for readdir
536 * handling. Otherwise, check to see if the hash matches the
537 * desired contiuation hash. If it doesn't, return since
538 * there's no point to read in the successive index pages.
539 */
540 bhash = dx_get_hash(p->at);
541 if (start_hash)
542 *start_hash = bhash;
543 if ((hash & 1) == 0) {
544 if ((bhash & ~1) != hash)
545 return 0;
546 }
547 /*
548 * If the hash is HASH_NB_ALWAYS, we always go to the next
549 * block so no check is necessary
550 */
551 while (num_frames--) {
552 if (!(bh = ext3_bread(NULL, dir, dx_get_block(p->at),
553 0, &err)))
554 return err; /* Failure */
555 p++;
556 brelse (p->bh);
557 p->bh = bh;
558 p->at = p->entries = ((struct dx_node *) bh->b_data)->entries;
559 }
560 return 1;
561}
562
563
564/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 * This function fills a red-black tree with information from a
566 * directory block. It returns the number directory entries loaded
567 * into the tree. If there is an error it is returned in err.
568 */
569static int htree_dirblock_to_tree(struct file *dir_file,
570 struct inode *dir, int block,
571 struct dx_hash_info *hinfo,
572 __u32 start_hash, __u32 start_minor_hash)
573{
574 struct buffer_head *bh;
575 struct ext3_dir_entry_2 *de, *top;
576 int err, count = 0;
577
578 dxtrace(printk("In htree dirblock_to_tree: block %d\n", block));
579 if (!(bh = ext3_bread (NULL, dir, block, 0, &err)))
580 return err;
581
582 de = (struct ext3_dir_entry_2 *) bh->b_data;
583 top = (struct ext3_dir_entry_2 *) ((char *) de +
584 dir->i_sb->s_blocksize -
585 EXT3_DIR_REC_LEN(0));
586 for (; de < top; de = ext3_next_entry(de)) {
Eric Sandeen40b85132006-12-06 20:36:26 -0800587 if (!ext3_check_dir_entry("htree_dirblock_to_tree", dir, de, bh,
588 (block<<EXT3_BLOCK_SIZE_BITS(dir->i_sb))
589 +((char *)de - bh->b_data))) {
590 /* On error, skip the f_pos to the next block. */
591 dir_file->f_pos = (dir_file->f_pos |
592 (dir->i_sb->s_blocksize - 1)) + 1;
593 brelse (bh);
594 return count;
595 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596 ext3fs_dirhash(de->name, de->name_len, hinfo);
597 if ((hinfo->hash < start_hash) ||
598 ((hinfo->hash == start_hash) &&
599 (hinfo->minor_hash < start_minor_hash)))
600 continue;
601 if (de->inode == 0)
602 continue;
603 if ((err = ext3_htree_store_dirent(dir_file,
604 hinfo->hash, hinfo->minor_hash, de)) != 0) {
605 brelse(bh);
606 return err;
607 }
608 count++;
609 }
610 brelse(bh);
611 return count;
612}
613
614
615/*
616 * This function fills a red-black tree with information from a
617 * directory. We start scanning the directory in hash order, starting
618 * at start_hash and start_minor_hash.
619 *
620 * This function returns the number of entries inserted into the tree,
621 * or a negative error code.
622 */
623int ext3_htree_fill_tree(struct file *dir_file, __u32 start_hash,
624 __u32 start_minor_hash, __u32 *next_hash)
625{
626 struct dx_hash_info hinfo;
627 struct ext3_dir_entry_2 *de;
628 struct dx_frame frames[2], *frame;
629 struct inode *dir;
630 int block, err;
631 int count = 0;
632 int ret;
633 __u32 hashval;
634
635 dxtrace(printk("In htree_fill_tree, start hash: %x:%x\n", start_hash,
636 start_minor_hash));
Josef "Jeff" Sipekfe21a692006-12-08 02:36:38 -0800637 dir = dir_file->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638 if (!(EXT3_I(dir)->i_flags & EXT3_INDEX_FL)) {
639 hinfo.hash_version = EXT3_SB(dir->i_sb)->s_def_hash_version;
640 hinfo.seed = EXT3_SB(dir->i_sb)->s_hash_seed;
641 count = htree_dirblock_to_tree(dir_file, dir, 0, &hinfo,
642 start_hash, start_minor_hash);
643 *next_hash = ~0;
644 return count;
645 }
646 hinfo.hash = start_hash;
647 hinfo.minor_hash = 0;
Josef "Jeff" Sipekfe21a692006-12-08 02:36:38 -0800648 frame = dx_probe(NULL, dir_file->f_path.dentry->d_inode, &hinfo, frames, &err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649 if (!frame)
650 return err;
651
652 /* Add '.' and '..' from the htree header */
653 if (!start_hash && !start_minor_hash) {
654 de = (struct ext3_dir_entry_2 *) frames[0].bh->b_data;
655 if ((err = ext3_htree_store_dirent(dir_file, 0, 0, de)) != 0)
656 goto errout;
657 count++;
658 }
659 if (start_hash < 2 || (start_hash ==2 && start_minor_hash==0)) {
660 de = (struct ext3_dir_entry_2 *) frames[0].bh->b_data;
661 de = ext3_next_entry(de);
662 if ((err = ext3_htree_store_dirent(dir_file, 2, 0, de)) != 0)
663 goto errout;
664 count++;
665 }
666
667 while (1) {
668 block = dx_get_block(frame->at);
669 ret = htree_dirblock_to_tree(dir_file, dir, block, &hinfo,
670 start_hash, start_minor_hash);
671 if (ret < 0) {
672 err = ret;
673 goto errout;
674 }
675 count += ret;
676 hashval = ~0;
Mingming Caoae6ddcc2006-09-27 01:49:27 -0700677 ret = ext3_htree_next_block(dir, HASH_NB_ALWAYS,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678 frame, frames, &hashval);
679 *next_hash = hashval;
680 if (ret < 0) {
681 err = ret;
682 goto errout;
683 }
684 /*
685 * Stop if: (a) there are no more entries, or
686 * (b) we have inserted at least one entry and the
687 * next hash value is not a continuation
688 */
689 if ((ret == 0) ||
690 (count && ((hashval & 1) == 0)))
691 break;
692 }
693 dx_release(frames);
Mingming Caoae6ddcc2006-09-27 01:49:27 -0700694 dxtrace(printk("Fill tree: returned %d entries, next hash: %x\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695 count, *next_hash));
696 return count;
697errout:
698 dx_release(frames);
699 return (err);
700}
701
702
703/*
704 * Directory block splitting, compacting
705 */
706
Eric Sandeenef2b02d2007-09-18 22:46:42 -0700707/*
708 * Create map of hash values, offsets, and sizes, stored at end of block.
709 * Returns number of entries mapped.
710 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711static int dx_make_map (struct ext3_dir_entry_2 *de, int size,
712 struct dx_hash_info *hinfo, struct dx_map_entry *map_tail)
713{
714 int count = 0;
715 char *base = (char *) de;
716 struct dx_hash_info h = *hinfo;
717
718 while ((char *) de < base + size)
719 {
720 if (de->name_len && de->inode) {
721 ext3fs_dirhash(de->name, de->name_len, &h);
722 map_tail--;
723 map_tail->hash = h.hash;
Eric Sandeenef2b02d2007-09-18 22:46:42 -0700724 map_tail->offs = (u16) ((char *) de - base);
725 map_tail->size = le16_to_cpu(de->rec_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726 count++;
727 cond_resched();
728 }
729 /* XXX: do we need to check rec_len == 0 case? -Chris */
Jan Kara7c06a8d2007-11-14 17:00:19 -0800730 de = ext3_next_entry(de);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731 }
732 return count;
733}
734
Eric Sandeenef2b02d2007-09-18 22:46:42 -0700735/* Sort map by hash value */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736static void dx_sort_map (struct dx_map_entry *map, unsigned count)
737{
738 struct dx_map_entry *p, *q, *top = map + count - 1;
739 int more;
740 /* Combsort until bubble sort doesn't suck */
741 while (count > 2)
742 {
743 count = count*10/13;
744 if (count - 9 < 2) /* 9, 10 -> 11 */
745 count = 11;
746 for (p = top, q = p - count; q >= map; p--, q--)
747 if (p->hash < q->hash)
748 swap(*p, *q);
749 }
750 /* Garden variety bubble sort */
751 do {
752 more = 0;
753 q = top;
754 while (q-- > map)
755 {
756 if (q[1].hash >= q[0].hash)
757 continue;
758 swap(*(q+1), *q);
759 more = 1;
760 }
761 } while(more);
762}
763
764static void dx_insert_block(struct dx_frame *frame, u32 hash, u32 block)
765{
766 struct dx_entry *entries = frame->entries;
767 struct dx_entry *old = frame->at, *new = old + 1;
768 int count = dx_get_count(entries);
769
770 assert(count < dx_get_limit(entries));
771 assert(old < entries + count);
772 memmove(new + 1, new, (char *)(entries + count) - (char *)(new));
773 dx_set_hash(new, hash);
774 dx_set_block(new, block);
775 dx_set_count(entries, count + 1);
776}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777
778static void ext3_update_dx_flag(struct inode *inode)
779{
780 if (!EXT3_HAS_COMPAT_FEATURE(inode->i_sb,
781 EXT3_FEATURE_COMPAT_DIR_INDEX))
782 EXT3_I(inode)->i_flags &= ~EXT3_INDEX_FL;
783}
784
785/*
786 * NOTE! unlike strncmp, ext3_match returns 1 for success, 0 for failure.
787 *
788 * `len <= EXT3_NAME_LEN' is guaranteed by caller.
789 * `de != NULL' is guaranteed by caller.
790 */
791static inline int ext3_match (int len, const char * const name,
792 struct ext3_dir_entry_2 * de)
793{
794 if (len != de->name_len)
795 return 0;
796 if (!de->inode)
797 return 0;
798 return !memcmp(name, de->name, len);
799}
800
801/*
802 * Returns 0 if not found, -1 on failure, and 1 on success
803 */
804static inline int search_dirblock(struct buffer_head * bh,
805 struct inode *dir,
806 struct dentry *dentry,
807 unsigned long offset,
808 struct ext3_dir_entry_2 ** res_dir)
809{
810 struct ext3_dir_entry_2 * de;
811 char * dlimit;
812 int de_len;
813 const char *name = dentry->d_name.name;
814 int namelen = dentry->d_name.len;
815
816 de = (struct ext3_dir_entry_2 *) bh->b_data;
817 dlimit = bh->b_data + dir->i_sb->s_blocksize;
818 while ((char *) de < dlimit) {
819 /* this code is executed quadratically often */
820 /* do minimal checking `by hand' */
821
822 if ((char *) de + namelen <= dlimit &&
823 ext3_match (namelen, name, de)) {
824 /* found a match - just to be sure, do a full check */
825 if (!ext3_check_dir_entry("ext3_find_entry",
826 dir, de, bh, offset))
827 return -1;
828 *res_dir = de;
829 return 1;
830 }
831 /* prevent looping on a bad block */
Jan Kara7c06a8d2007-11-14 17:00:19 -0800832 de_len = ext3_rec_len_from_disk(de->rec_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833 if (de_len <= 0)
834 return -1;
835 offset += de_len;
836 de = (struct ext3_dir_entry_2 *) ((char *) de + de_len);
837 }
838 return 0;
839}
840
841
842/*
843 * ext3_find_entry()
844 *
845 * finds an entry in the specified directory with the wanted name. It
846 * returns the cache buffer in which the entry was found, and the entry
847 * itself (as a parameter - res_dir). It does NOT read the inode of the
848 * entry - you'll have to do that yourself if you want to.
849 *
850 * The returned buffer_head has ->b_count elevated. The caller is expected
851 * to brelse() it when appropriate.
852 */
853static struct buffer_head * ext3_find_entry (struct dentry *dentry,
854 struct ext3_dir_entry_2 ** res_dir)
855{
856 struct super_block * sb;
857 struct buffer_head * bh_use[NAMEI_RA_SIZE];
858 struct buffer_head * bh, *ret = NULL;
859 unsigned long start, block, b;
860 int ra_max = 0; /* Number of bh's in the readahead
861 buffer, bh_use[] */
862 int ra_ptr = 0; /* Current index into readahead
863 buffer */
864 int num = 0;
865 int nblocks, i, err;
866 struct inode *dir = dentry->d_parent->d_inode;
867 int namelen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868
869 *res_dir = NULL;
870 sb = dir->i_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871 namelen = dentry->d_name.len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872 if (namelen > EXT3_NAME_LEN)
873 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874 if (is_dx(dir)) {
875 bh = ext3_dx_find_entry(dentry, res_dir, &err);
876 /*
877 * On success, or if the error was file not found,
878 * return. Otherwise, fall back to doing a search the
879 * old fashioned way.
880 */
881 if (bh || (err != ERR_BAD_DX_DIR))
882 return bh;
883 dxtrace(printk("ext3_find_entry: dx failed, falling back\n"));
884 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885 nblocks = dir->i_size >> EXT3_BLOCK_SIZE_BITS(sb);
886 start = EXT3_I(dir)->i_dir_start_lookup;
887 if (start >= nblocks)
888 start = 0;
889 block = start;
890restart:
891 do {
892 /*
893 * We deal with the read-ahead logic here.
894 */
895 if (ra_ptr >= ra_max) {
896 /* Refill the readahead buffer */
897 ra_ptr = 0;
898 b = block;
899 for (ra_max = 0; ra_max < NAMEI_RA_SIZE; ra_max++) {
900 /*
901 * Terminate if we reach the end of the
902 * directory and must wrap, or if our
903 * search has finished at this block.
904 */
905 if (b >= nblocks || (num && block == start)) {
906 bh_use[ra_max] = NULL;
907 break;
908 }
909 num++;
910 bh = ext3_getblk(NULL, dir, b++, 0, &err);
911 bh_use[ra_max] = bh;
912 if (bh)
Jens Axboecaa38fb2006-07-23 01:41:26 +0200913 ll_rw_block(READ_META, 1, &bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700914 }
915 }
916 if ((bh = bh_use[ra_ptr++]) == NULL)
917 goto next;
918 wait_on_buffer(bh);
919 if (!buffer_uptodate(bh)) {
920 /* read error, skip block & hope for the best */
Harvey Harrisone05b6b52008-04-28 02:16:15 -0700921 ext3_error(sb, __func__, "reading directory #%lu "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922 "offset %lu", dir->i_ino, block);
923 brelse(bh);
924 goto next;
925 }
926 i = search_dirblock(bh, dir, dentry,
927 block << EXT3_BLOCK_SIZE_BITS(sb), res_dir);
928 if (i == 1) {
929 EXT3_I(dir)->i_dir_start_lookup = block;
930 ret = bh;
931 goto cleanup_and_exit;
932 } else {
933 brelse(bh);
934 if (i < 0)
935 goto cleanup_and_exit;
936 }
937 next:
938 if (++block >= nblocks)
939 block = 0;
940 } while (block != start);
941
942 /*
943 * If the directory has grown while we were searching, then
944 * search the last part of the directory before giving up.
945 */
946 block = nblocks;
947 nblocks = dir->i_size >> EXT3_BLOCK_SIZE_BITS(sb);
948 if (block < nblocks) {
949 start = 0;
950 goto restart;
951 }
952
953cleanup_and_exit:
954 /* Clean up the read-ahead blocks */
955 for (; ra_ptr < ra_max; ra_ptr++)
956 brelse (bh_use[ra_ptr]);
957 return ret;
958}
959
Linus Torvalds1da177e2005-04-16 15:20:36 -0700960static struct buffer_head * ext3_dx_find_entry(struct dentry *dentry,
961 struct ext3_dir_entry_2 **res_dir, int *err)
962{
963 struct super_block * sb;
964 struct dx_hash_info hinfo;
965 u32 hash;
966 struct dx_frame frames[2], *frame;
967 struct ext3_dir_entry_2 *de, *top;
968 struct buffer_head *bh;
969 unsigned long block;
970 int retval;
971 int namelen = dentry->d_name.len;
972 const u8 *name = dentry->d_name.name;
973 struct inode *dir = dentry->d_parent->d_inode;
974
975 sb = dir->i_sb;
Andreas Dilgeracfa1823d2005-06-23 00:09:45 -0700976 /* NFS may look up ".." - look at dx_root directory block */
977 if (namelen > 2 || name[0] != '.'||(name[1] != '.' && name[1] != '\0')){
978 if (!(frame = dx_probe(dentry, NULL, &hinfo, frames, err)))
979 return NULL;
980 } else {
981 frame = frames;
982 frame->bh = NULL; /* for dx_release() */
983 frame->at = (struct dx_entry *)frames; /* hack for zero entry*/
984 dx_set_block(frame->at, 0); /* dx_root block is 0 */
985 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700986 hash = hinfo.hash;
987 do {
988 block = dx_get_block(frame->at);
989 if (!(bh = ext3_bread (NULL,dir, block, 0, err)))
990 goto errout;
991 de = (struct ext3_dir_entry_2 *) bh->b_data;
992 top = (struct ext3_dir_entry_2 *) ((char *) de + sb->s_blocksize -
993 EXT3_DIR_REC_LEN(0));
Duane Griffin275c0a82008-07-25 01:46:31 -0700994 for (; de < top; de = ext3_next_entry(de)) {
995 int off = (block << EXT3_BLOCK_SIZE_BITS(sb))
996 + ((char *) de - bh->b_data);
997
998 if (!ext3_check_dir_entry(__func__, dir, de, bh, off)) {
999 brelse(bh);
Dmitriy Monakhovfedee542007-05-08 00:25:34 -07001000 *err = ERR_BAD_DX_DIR;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001 goto errout;
1002 }
Duane Griffin275c0a82008-07-25 01:46:31 -07001003
1004 if (ext3_match(namelen, name, de)) {
1005 *res_dir = de;
1006 dx_release(frames);
1007 return bh;
1008 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009 }
1010 brelse (bh);
1011 /* Check to see if we should continue to search */
1012 retval = ext3_htree_next_block(dir, hash, frame,
1013 frames, NULL);
1014 if (retval < 0) {
Harvey Harrisone05b6b52008-04-28 02:16:15 -07001015 ext3_warning(sb, __func__,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001016 "error reading index page in directory #%lu",
1017 dir->i_ino);
1018 *err = retval;
1019 goto errout;
1020 }
1021 } while (retval == 1);
1022
1023 *err = -ENOENT;
1024errout:
1025 dxtrace(printk("%s not found\n", name));
1026 dx_release (frames);
1027 return NULL;
1028}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029
1030static struct dentry *ext3_lookup(struct inode * dir, struct dentry *dentry, struct nameidata *nd)
1031{
1032 struct inode * inode;
1033 struct ext3_dir_entry_2 * de;
1034 struct buffer_head * bh;
1035
1036 if (dentry->d_name.len > EXT3_NAME_LEN)
1037 return ERR_PTR(-ENAMETOOLONG);
1038
1039 bh = ext3_find_entry(dentry, &de);
1040 inode = NULL;
1041 if (bh) {
1042 unsigned long ino = le32_to_cpu(de->inode);
1043 brelse (bh);
Neil Brown2ccb48e2006-07-30 03:03:01 -07001044 if (!ext3_valid_inum(dir->i_sb, ino)) {
1045 ext3_error(dir->i_sb, "ext3_lookup",
1046 "bad inode number: %lu", ino);
David Howells473043d2008-02-07 00:15:36 -08001047 return ERR_PTR(-EIO);
Vasily Averina6c15c22007-07-15 23:40:46 -07001048 }
David Howells473043d2008-02-07 00:15:36 -08001049 inode = ext3_iget(dir->i_sb, ino);
1050 if (IS_ERR(inode))
1051 return ERR_CAST(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001052 }
Pekka Enbergba7fe362006-01-14 13:21:08 -08001053 return d_splice_alias(inode, dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001054}
1055
1056
1057struct dentry *ext3_get_parent(struct dentry *child)
1058{
1059 unsigned long ino;
1060 struct dentry *parent;
1061 struct inode *inode;
1062 struct dentry dotdot;
1063 struct ext3_dir_entry_2 * de;
1064 struct buffer_head *bh;
1065
1066 dotdot.d_name.name = "..";
1067 dotdot.d_name.len = 2;
1068 dotdot.d_parent = child; /* confusing, isn't it! */
1069
1070 bh = ext3_find_entry(&dotdot, &de);
1071 inode = NULL;
1072 if (!bh)
1073 return ERR_PTR(-ENOENT);
1074 ino = le32_to_cpu(de->inode);
1075 brelse(bh);
Neil Brown2ccb48e2006-07-30 03:03:01 -07001076
1077 if (!ext3_valid_inum(child->d_inode->i_sb, ino)) {
1078 ext3_error(child->d_inode->i_sb, "ext3_get_parent",
1079 "bad inode number: %lu", ino);
David Howells473043d2008-02-07 00:15:36 -08001080 return ERR_PTR(-EIO);
Vasily Averina6c15c22007-07-15 23:40:46 -07001081 }
1082
David Howells473043d2008-02-07 00:15:36 -08001083 inode = ext3_iget(child->d_inode->i_sb, ino);
1084 if (IS_ERR(inode))
1085 return ERR_CAST(inode);
1086
Linus Torvalds1da177e2005-04-16 15:20:36 -07001087 parent = d_alloc_anon(inode);
1088 if (!parent) {
1089 iput(inode);
1090 parent = ERR_PTR(-ENOMEM);
1091 }
1092 return parent;
Mingming Caoae6ddcc2006-09-27 01:49:27 -07001093}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001094
1095#define S_SHIFT 12
1096static unsigned char ext3_type_by_mode[S_IFMT >> S_SHIFT] = {
1097 [S_IFREG >> S_SHIFT] = EXT3_FT_REG_FILE,
1098 [S_IFDIR >> S_SHIFT] = EXT3_FT_DIR,
1099 [S_IFCHR >> S_SHIFT] = EXT3_FT_CHRDEV,
1100 [S_IFBLK >> S_SHIFT] = EXT3_FT_BLKDEV,
1101 [S_IFIFO >> S_SHIFT] = EXT3_FT_FIFO,
1102 [S_IFSOCK >> S_SHIFT] = EXT3_FT_SOCK,
1103 [S_IFLNK >> S_SHIFT] = EXT3_FT_SYMLINK,
1104};
1105
1106static inline void ext3_set_de_type(struct super_block *sb,
1107 struct ext3_dir_entry_2 *de,
1108 umode_t mode) {
1109 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_FILETYPE))
1110 de->file_type = ext3_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
1111}
1112
Eric Sandeenef2b02d2007-09-18 22:46:42 -07001113/*
1114 * Move count entries from end of map between two memory locations.
1115 * Returns pointer to last entry moved.
1116 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001117static struct ext3_dir_entry_2 *
1118dx_move_dirents(char *from, char *to, struct dx_map_entry *map, int count)
1119{
1120 unsigned rec_len = 0;
1121
1122 while (count--) {
1123 struct ext3_dir_entry_2 *de = (struct ext3_dir_entry_2 *) (from + map->offs);
1124 rec_len = EXT3_DIR_REC_LEN(de->name_len);
1125 memcpy (to, de, rec_len);
1126 ((struct ext3_dir_entry_2 *) to)->rec_len =
Jan Kara7c06a8d2007-11-14 17:00:19 -08001127 ext3_rec_len_to_disk(rec_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001128 de->inode = 0;
1129 map++;
1130 to += rec_len;
1131 }
1132 return (struct ext3_dir_entry_2 *) (to - rec_len);
1133}
1134
Eric Sandeenef2b02d2007-09-18 22:46:42 -07001135/*
1136 * Compact each dir entry in the range to the minimal rec_len.
1137 * Returns pointer to last entry in range.
1138 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001139static struct ext3_dir_entry_2* dx_pack_dirents(char *base, int size)
1140{
1141 struct ext3_dir_entry_2 *next, *to, *prev, *de = (struct ext3_dir_entry_2 *) base;
1142 unsigned rec_len = 0;
1143
1144 prev = to = de;
1145 while ((char*)de < base + size) {
Jan Kara7c06a8d2007-11-14 17:00:19 -08001146 next = ext3_next_entry(de);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001147 if (de->inode && de->name_len) {
1148 rec_len = EXT3_DIR_REC_LEN(de->name_len);
1149 if (de > to)
1150 memmove(to, de, rec_len);
Jan Kara7c06a8d2007-11-14 17:00:19 -08001151 to->rec_len = ext3_rec_len_to_disk(rec_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001152 prev = to;
1153 to = (struct ext3_dir_entry_2 *) (((char *) to) + rec_len);
1154 }
1155 de = next;
1156 }
1157 return prev;
1158}
1159
Eric Sandeenef2b02d2007-09-18 22:46:42 -07001160/*
1161 * Split a full leaf block to make room for a new dir entry.
1162 * Allocate a new block, and move entries so that they are approx. equally full.
1163 * Returns pointer to de in block into which the new entry will be inserted.
1164 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001165static struct ext3_dir_entry_2 *do_split(handle_t *handle, struct inode *dir,
1166 struct buffer_head **bh,struct dx_frame *frame,
1167 struct dx_hash_info *hinfo, int *error)
1168{
1169 unsigned blocksize = dir->i_sb->s_blocksize;
1170 unsigned count, continued;
1171 struct buffer_head *bh2;
1172 u32 newblock;
1173 u32 hash2;
1174 struct dx_map_entry *map;
1175 char *data1 = (*bh)->b_data, *data2;
Eric Sandeenef2b02d2007-09-18 22:46:42 -07001176 unsigned split, move, size, i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001177 struct ext3_dir_entry_2 *de = NULL, *de2;
Dmitriy Monakhovfedee542007-05-08 00:25:34 -07001178 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179
Dmitriy Monakhovfedee542007-05-08 00:25:34 -07001180 bh2 = ext3_append (handle, dir, &newblock, &err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001181 if (!(bh2)) {
1182 brelse(*bh);
1183 *bh = NULL;
1184 goto errout;
1185 }
1186
1187 BUFFER_TRACE(*bh, "get_write_access");
1188 err = ext3_journal_get_write_access(handle, *bh);
Dmitriy Monakhovfedee542007-05-08 00:25:34 -07001189 if (err)
1190 goto journal_error;
1191
Linus Torvalds1da177e2005-04-16 15:20:36 -07001192 BUFFER_TRACE(frame->bh, "get_write_access");
1193 err = ext3_journal_get_write_access(handle, frame->bh);
1194 if (err)
1195 goto journal_error;
1196
1197 data2 = bh2->b_data;
1198
1199 /* create map in the end of data2 block */
1200 map = (struct dx_map_entry *) (data2 + blocksize);
1201 count = dx_make_map ((struct ext3_dir_entry_2 *) data1,
1202 blocksize, hinfo, map);
1203 map -= count;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001204 dx_sort_map (map, count);
Eric Sandeenef2b02d2007-09-18 22:46:42 -07001205 /* Split the existing block in the middle, size-wise */
1206 size = 0;
1207 move = 0;
1208 for (i = count-1; i >= 0; i--) {
1209 /* is more than half of this entry in 2nd half of the block? */
1210 if (size + map[i].size/2 > blocksize/2)
1211 break;
1212 size += map[i].size;
1213 move++;
1214 }
1215 /* map index at which we will split */
1216 split = count - move;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001217 hash2 = map[split].hash;
1218 continued = hash2 == map[split - 1].hash;
1219 dxtrace(printk("Split block %i at %x, %i/%i\n",
1220 dx_get_block(frame->at), hash2, split, count-split));
1221
1222 /* Fancy dance to stay within two buffers */
1223 de2 = dx_move_dirents(data1, data2, map + split, count - split);
1224 de = dx_pack_dirents(data1,blocksize);
Jan Kara7c06a8d2007-11-14 17:00:19 -08001225 de->rec_len = ext3_rec_len_to_disk(data1 + blocksize - (char *) de);
1226 de2->rec_len = ext3_rec_len_to_disk(data2 + blocksize - (char *) de2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001227 dxtrace(dx_show_leaf (hinfo, (struct ext3_dir_entry_2 *) data1, blocksize, 1));
1228 dxtrace(dx_show_leaf (hinfo, (struct ext3_dir_entry_2 *) data2, blocksize, 1));
1229
1230 /* Which block gets the new entry? */
1231 if (hinfo->hash >= hash2)
1232 {
1233 swap(*bh, bh2);
1234 de = de2;
1235 }
1236 dx_insert_block (frame, hash2 + continued, newblock);
1237 err = ext3_journal_dirty_metadata (handle, bh2);
1238 if (err)
1239 goto journal_error;
1240 err = ext3_journal_dirty_metadata (handle, frame->bh);
1241 if (err)
1242 goto journal_error;
1243 brelse (bh2);
1244 dxtrace(dx_show_index ("frame", frame->entries));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001245 return de;
Dmitriy Monakhovfedee542007-05-08 00:25:34 -07001246
1247journal_error:
1248 brelse(*bh);
1249 brelse(bh2);
1250 *bh = NULL;
1251 ext3_std_error(dir->i_sb, err);
1252errout:
1253 *error = err;
1254 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001255}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001256
1257
1258/*
1259 * Add a new entry into a directory (leaf) block. If de is non-NULL,
1260 * it points to a directory entry which is guaranteed to be large
1261 * enough for new directory entry. If de is NULL, then
1262 * add_dirent_to_buf will attempt search the directory block for
1263 * space. It will return -ENOSPC if no space is available, and -EIO
1264 * and -EEXIST if directory entry already exists.
Mingming Caoae6ddcc2006-09-27 01:49:27 -07001265 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001266 * NOTE! bh is NOT released in the case where ENOSPC is returned. In
1267 * all other cases bh is released.
1268 */
1269static int add_dirent_to_buf(handle_t *handle, struct dentry *dentry,
1270 struct inode *inode, struct ext3_dir_entry_2 *de,
1271 struct buffer_head * bh)
1272{
1273 struct inode *dir = dentry->d_parent->d_inode;
1274 const char *name = dentry->d_name.name;
1275 int namelen = dentry->d_name.len;
1276 unsigned long offset = 0;
1277 unsigned short reclen;
1278 int nlen, rlen, err;
1279 char *top;
1280
1281 reclen = EXT3_DIR_REC_LEN(namelen);
1282 if (!de) {
1283 de = (struct ext3_dir_entry_2 *)bh->b_data;
1284 top = bh->b_data + dir->i_sb->s_blocksize - reclen;
1285 while ((char *) de <= top) {
1286 if (!ext3_check_dir_entry("ext3_add_entry", dir, de,
1287 bh, offset)) {
1288 brelse (bh);
1289 return -EIO;
1290 }
1291 if (ext3_match (namelen, name, de)) {
1292 brelse (bh);
1293 return -EEXIST;
1294 }
1295 nlen = EXT3_DIR_REC_LEN(de->name_len);
Jan Kara7c06a8d2007-11-14 17:00:19 -08001296 rlen = ext3_rec_len_from_disk(de->rec_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001297 if ((de->inode? rlen - nlen: rlen) >= reclen)
1298 break;
1299 de = (struct ext3_dir_entry_2 *)((char *)de + rlen);
1300 offset += rlen;
1301 }
1302 if ((char *) de > top)
1303 return -ENOSPC;
1304 }
1305 BUFFER_TRACE(bh, "get_write_access");
1306 err = ext3_journal_get_write_access(handle, bh);
1307 if (err) {
1308 ext3_std_error(dir->i_sb, err);
1309 brelse(bh);
1310 return err;
1311 }
1312
1313 /* By now the buffer is marked for journaling */
1314 nlen = EXT3_DIR_REC_LEN(de->name_len);
Jan Kara7c06a8d2007-11-14 17:00:19 -08001315 rlen = ext3_rec_len_from_disk(de->rec_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001316 if (de->inode) {
1317 struct ext3_dir_entry_2 *de1 = (struct ext3_dir_entry_2 *)((char *)de + nlen);
Jan Kara7c06a8d2007-11-14 17:00:19 -08001318 de1->rec_len = ext3_rec_len_to_disk(rlen - nlen);
1319 de->rec_len = ext3_rec_len_to_disk(nlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001320 de = de1;
1321 }
1322 de->file_type = EXT3_FT_UNKNOWN;
1323 if (inode) {
1324 de->inode = cpu_to_le32(inode->i_ino);
1325 ext3_set_de_type(dir->i_sb, de, inode->i_mode);
1326 } else
1327 de->inode = 0;
1328 de->name_len = namelen;
1329 memcpy (de->name, name, namelen);
1330 /*
1331 * XXX shouldn't update any times until successful
1332 * completion of syscall, but too many callers depend
1333 * on this.
1334 *
1335 * XXX similarly, too many callers depend on
1336 * ext3_new_inode() setting the times, but error
1337 * recovery deletes the inode, so the worst that can
1338 * happen is that the times are slightly out of date
1339 * and/or different from the directory change time.
1340 */
1341 dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
1342 ext3_update_dx_flag(dir);
1343 dir->i_version++;
1344 ext3_mark_inode_dirty(handle, dir);
1345 BUFFER_TRACE(bh, "call ext3_journal_dirty_metadata");
1346 err = ext3_journal_dirty_metadata(handle, bh);
1347 if (err)
1348 ext3_std_error(dir->i_sb, err);
1349 brelse(bh);
1350 return 0;
1351}
1352
Linus Torvalds1da177e2005-04-16 15:20:36 -07001353/*
1354 * This converts a one block unindexed directory to a 3 block indexed
1355 * directory, and adds the dentry to the indexed directory.
1356 */
1357static int make_indexed_dir(handle_t *handle, struct dentry *dentry,
1358 struct inode *inode, struct buffer_head *bh)
1359{
1360 struct inode *dir = dentry->d_parent->d_inode;
1361 const char *name = dentry->d_name.name;
1362 int namelen = dentry->d_name.len;
1363 struct buffer_head *bh2;
1364 struct dx_root *root;
1365 struct dx_frame frames[2], *frame;
1366 struct dx_entry *entries;
1367 struct ext3_dir_entry_2 *de, *de2;
1368 char *data1, *top;
1369 unsigned len;
1370 int retval;
1371 unsigned blocksize;
1372 struct dx_hash_info hinfo;
1373 u32 block;
1374 struct fake_dirent *fde;
1375
1376 blocksize = dir->i_sb->s_blocksize;
1377 dxtrace(printk("Creating index\n"));
1378 retval = ext3_journal_get_write_access(handle, bh);
1379 if (retval) {
1380 ext3_std_error(dir->i_sb, retval);
1381 brelse(bh);
1382 return retval;
1383 }
1384 root = (struct dx_root *) bh->b_data;
1385
1386 bh2 = ext3_append (handle, dir, &block, &retval);
1387 if (!(bh2)) {
1388 brelse(bh);
1389 return retval;
1390 }
1391 EXT3_I(dir)->i_flags |= EXT3_INDEX_FL;
1392 data1 = bh2->b_data;
1393
1394 /* The 0th block becomes the root, move the dirents out */
1395 fde = &root->dotdot;
Jan Kara7c06a8d2007-11-14 17:00:19 -08001396 de = (struct ext3_dir_entry_2 *)((char *)fde +
1397 ext3_rec_len_from_disk(fde->rec_len));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001398 len = ((char *) root) + blocksize - (char *) de;
1399 memcpy (data1, de, len);
1400 de = (struct ext3_dir_entry_2 *) data1;
1401 top = data1 + len;
Jan Kara7c06a8d2007-11-14 17:00:19 -08001402 while ((char *)(de2 = ext3_next_entry(de)) < top)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001403 de = de2;
Jan Kara7c06a8d2007-11-14 17:00:19 -08001404 de->rec_len = ext3_rec_len_to_disk(data1 + blocksize - (char *) de);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001405 /* Initialize the root; the dot dirents already exist */
1406 de = (struct ext3_dir_entry_2 *) (&root->dotdot);
Jan Kara7c06a8d2007-11-14 17:00:19 -08001407 de->rec_len = ext3_rec_len_to_disk(blocksize - EXT3_DIR_REC_LEN(2));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001408 memset (&root->info, 0, sizeof(root->info));
1409 root->info.info_length = sizeof(root->info);
1410 root->info.hash_version = EXT3_SB(dir->i_sb)->s_def_hash_version;
1411 entries = root->entries;
1412 dx_set_block (entries, 1);
1413 dx_set_count (entries, 1);
1414 dx_set_limit (entries, dx_root_limit(dir, sizeof(root->info)));
1415
1416 /* Initialize as for dx_probe */
1417 hinfo.hash_version = root->info.hash_version;
1418 hinfo.seed = EXT3_SB(dir->i_sb)->s_hash_seed;
1419 ext3fs_dirhash(name, namelen, &hinfo);
1420 frame = frames;
1421 frame->entries = entries;
1422 frame->at = entries;
1423 frame->bh = bh;
1424 bh = bh2;
1425 de = do_split(handle,dir, &bh, frame, &hinfo, &retval);
1426 dx_release (frames);
1427 if (!(de))
1428 return retval;
1429
1430 return add_dirent_to_buf(handle, dentry, inode, de, bh);
1431}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001432
1433/*
1434 * ext3_add_entry()
1435 *
1436 * adds a file entry to the specified directory, using the same
1437 * semantics as ext3_find_entry(). It returns NULL if it failed.
1438 *
1439 * NOTE!! The inode part of 'de' is left at 0 - which means you
1440 * may not sleep between calling this and putting something into
1441 * the entry, as someone else might have used it while you slept.
1442 */
1443static int ext3_add_entry (handle_t *handle, struct dentry *dentry,
1444 struct inode *inode)
1445{
1446 struct inode *dir = dentry->d_parent->d_inode;
1447 unsigned long offset;
1448 struct buffer_head * bh;
1449 struct ext3_dir_entry_2 *de;
1450 struct super_block * sb;
1451 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001452 int dx_fallback=0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001453 unsigned blocksize;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001454 u32 block, blocks;
1455
1456 sb = dir->i_sb;
1457 blocksize = sb->s_blocksize;
1458 if (!dentry->d_name.len)
1459 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001460 if (is_dx(dir)) {
1461 retval = ext3_dx_add_entry(handle, dentry, inode);
1462 if (!retval || (retval != ERR_BAD_DX_DIR))
1463 return retval;
1464 EXT3_I(dir)->i_flags &= ~EXT3_INDEX_FL;
1465 dx_fallback++;
1466 ext3_mark_inode_dirty(handle, dir);
1467 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001468 blocks = dir->i_size >> sb->s_blocksize_bits;
1469 for (block = 0, offset = 0; block < blocks; block++) {
1470 bh = ext3_bread(handle, dir, block, 0, &retval);
1471 if(!bh)
1472 return retval;
1473 retval = add_dirent_to_buf(handle, dentry, inode, NULL, bh);
1474 if (retval != -ENOSPC)
1475 return retval;
1476
Linus Torvalds1da177e2005-04-16 15:20:36 -07001477 if (blocks == 1 && !dx_fallback &&
1478 EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_DIR_INDEX))
1479 return make_indexed_dir(handle, dentry, inode, bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001480 brelse(bh);
1481 }
1482 bh = ext3_append(handle, dir, &block, &retval);
1483 if (!bh)
1484 return retval;
1485 de = (struct ext3_dir_entry_2 *) bh->b_data;
1486 de->inode = 0;
Jan Kara7c06a8d2007-11-14 17:00:19 -08001487 de->rec_len = ext3_rec_len_to_disk(blocksize);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001488 return add_dirent_to_buf(handle, dentry, inode, de, bh);
1489}
1490
Linus Torvalds1da177e2005-04-16 15:20:36 -07001491/*
1492 * Returns 0 for success, or a negative error value
1493 */
1494static int ext3_dx_add_entry(handle_t *handle, struct dentry *dentry,
1495 struct inode *inode)
1496{
1497 struct dx_frame frames[2], *frame;
1498 struct dx_entry *entries, *at;
1499 struct dx_hash_info hinfo;
1500 struct buffer_head * bh;
1501 struct inode *dir = dentry->d_parent->d_inode;
1502 struct super_block * sb = dir->i_sb;
1503 struct ext3_dir_entry_2 *de;
1504 int err;
1505
1506 frame = dx_probe(dentry, NULL, &hinfo, frames, &err);
1507 if (!frame)
1508 return err;
1509 entries = frame->entries;
1510 at = frame->at;
1511
1512 if (!(bh = ext3_bread(handle,dir, dx_get_block(frame->at), 0, &err)))
1513 goto cleanup;
1514
1515 BUFFER_TRACE(bh, "get_write_access");
1516 err = ext3_journal_get_write_access(handle, bh);
1517 if (err)
1518 goto journal_error;
1519
1520 err = add_dirent_to_buf(handle, dentry, inode, NULL, bh);
1521 if (err != -ENOSPC) {
1522 bh = NULL;
1523 goto cleanup;
1524 }
1525
1526 /* Block full, should compress but for now just split */
1527 dxtrace(printk("using %u of %u node entries\n",
1528 dx_get_count(entries), dx_get_limit(entries)));
1529 /* Need to split index? */
1530 if (dx_get_count(entries) == dx_get_limit(entries)) {
1531 u32 newblock;
1532 unsigned icount = dx_get_count(entries);
1533 int levels = frame - frames;
1534 struct dx_entry *entries2;
1535 struct dx_node *node2;
1536 struct buffer_head *bh2;
1537
1538 if (levels && (dx_get_count(frames->entries) ==
1539 dx_get_limit(frames->entries))) {
Harvey Harrisone05b6b52008-04-28 02:16:15 -07001540 ext3_warning(sb, __func__,
Glauber de Oliveira Costa9f406682006-01-08 01:03:22 -08001541 "Directory index full!");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001542 err = -ENOSPC;
1543 goto cleanup;
1544 }
1545 bh2 = ext3_append (handle, dir, &newblock, &err);
1546 if (!(bh2))
1547 goto cleanup;
1548 node2 = (struct dx_node *)(bh2->b_data);
1549 entries2 = node2->entries;
Jan Kara7c06a8d2007-11-14 17:00:19 -08001550 node2->fake.rec_len = ext3_rec_len_to_disk(sb->s_blocksize);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001551 node2->fake.inode = 0;
1552 BUFFER_TRACE(frame->bh, "get_write_access");
1553 err = ext3_journal_get_write_access(handle, frame->bh);
1554 if (err)
1555 goto journal_error;
1556 if (levels) {
1557 unsigned icount1 = icount/2, icount2 = icount - icount1;
1558 unsigned hash2 = dx_get_hash(entries + icount1);
1559 dxtrace(printk("Split index %i/%i\n", icount1, icount2));
1560
1561 BUFFER_TRACE(frame->bh, "get_write_access"); /* index root */
1562 err = ext3_journal_get_write_access(handle,
1563 frames[0].bh);
1564 if (err)
1565 goto journal_error;
1566
1567 memcpy ((char *) entries2, (char *) (entries + icount1),
1568 icount2 * sizeof(struct dx_entry));
1569 dx_set_count (entries, icount1);
1570 dx_set_count (entries2, icount2);
1571 dx_set_limit (entries2, dx_node_limit(dir));
1572
1573 /* Which index block gets the new entry? */
1574 if (at - entries >= icount1) {
1575 frame->at = at = at - entries - icount1 + entries2;
1576 frame->entries = entries = entries2;
1577 swap(frame->bh, bh2);
1578 }
1579 dx_insert_block (frames + 0, hash2, newblock);
1580 dxtrace(dx_show_index ("node", frames[1].entries));
1581 dxtrace(dx_show_index ("node",
1582 ((struct dx_node *) bh2->b_data)->entries));
1583 err = ext3_journal_dirty_metadata(handle, bh2);
1584 if (err)
1585 goto journal_error;
1586 brelse (bh2);
1587 } else {
1588 dxtrace(printk("Creating second level index...\n"));
1589 memcpy((char *) entries2, (char *) entries,
1590 icount * sizeof(struct dx_entry));
1591 dx_set_limit(entries2, dx_node_limit(dir));
1592
1593 /* Set up root */
1594 dx_set_count(entries, 1);
1595 dx_set_block(entries + 0, newblock);
1596 ((struct dx_root *) frames[0].bh->b_data)->info.indirect_levels = 1;
1597
1598 /* Add new access path frame */
1599 frame = frames + 1;
1600 frame->at = at = at - entries + entries2;
1601 frame->entries = entries = entries2;
1602 frame->bh = bh2;
1603 err = ext3_journal_get_write_access(handle,
1604 frame->bh);
1605 if (err)
1606 goto journal_error;
1607 }
1608 ext3_journal_dirty_metadata(handle, frames[0].bh);
1609 }
1610 de = do_split(handle, dir, &bh, frame, &hinfo, &err);
1611 if (!de)
1612 goto cleanup;
1613 err = add_dirent_to_buf(handle, dentry, inode, de, bh);
1614 bh = NULL;
1615 goto cleanup;
1616
1617journal_error:
1618 ext3_std_error(dir->i_sb, err);
1619cleanup:
1620 if (bh)
1621 brelse(bh);
1622 dx_release(frames);
1623 return err;
1624}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001625
1626/*
1627 * ext3_delete_entry deletes a directory entry by merging it with the
1628 * previous entry
1629 */
Mingming Caoae6ddcc2006-09-27 01:49:27 -07001630static int ext3_delete_entry (handle_t *handle,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001631 struct inode * dir,
1632 struct ext3_dir_entry_2 * de_del,
1633 struct buffer_head * bh)
1634{
1635 struct ext3_dir_entry_2 * de, * pde;
1636 int i;
1637
1638 i = 0;
1639 pde = NULL;
1640 de = (struct ext3_dir_entry_2 *) bh->b_data;
1641 while (i < bh->b_size) {
1642 if (!ext3_check_dir_entry("ext3_delete_entry", dir, de, bh, i))
1643 return -EIO;
1644 if (de == de_del) {
1645 BUFFER_TRACE(bh, "get_write_access");
1646 ext3_journal_get_write_access(handle, bh);
1647 if (pde)
Jan Kara7c06a8d2007-11-14 17:00:19 -08001648 pde->rec_len = ext3_rec_len_to_disk(
1649 ext3_rec_len_from_disk(pde->rec_len) +
1650 ext3_rec_len_from_disk(de->rec_len));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001651 else
1652 de->inode = 0;
1653 dir->i_version++;
1654 BUFFER_TRACE(bh, "call ext3_journal_dirty_metadata");
1655 ext3_journal_dirty_metadata(handle, bh);
1656 return 0;
1657 }
Jan Kara7c06a8d2007-11-14 17:00:19 -08001658 i += ext3_rec_len_from_disk(de->rec_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001659 pde = de;
Jan Kara7c06a8d2007-11-14 17:00:19 -08001660 de = ext3_next_entry(de);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001661 }
1662 return -ENOENT;
1663}
1664
Linus Torvalds1da177e2005-04-16 15:20:36 -07001665static int ext3_add_nondir(handle_t *handle,
1666 struct dentry *dentry, struct inode *inode)
1667{
1668 int err = ext3_add_entry(handle, dentry, inode);
1669 if (!err) {
1670 ext3_mark_inode_dirty(handle, inode);
1671 d_instantiate(dentry, inode);
1672 return 0;
1673 }
Eric Sandeen731b9a52007-02-10 01:46:16 -08001674 drop_nlink(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001675 iput(inode);
1676 return err;
1677}
1678
1679/*
1680 * By the time this is called, we already have created
1681 * the directory cache entry for the new file, but it
1682 * is so far negative - it has no inode.
1683 *
1684 * If the create succeeds, we fill in the inode information
Mingming Caoae6ddcc2006-09-27 01:49:27 -07001685 * with d_instantiate().
Linus Torvalds1da177e2005-04-16 15:20:36 -07001686 */
1687static int ext3_create (struct inode * dir, struct dentry * dentry, int mode,
1688 struct nameidata *nd)
1689{
Mingming Caoae6ddcc2006-09-27 01:49:27 -07001690 handle_t *handle;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001691 struct inode * inode;
1692 int err, retries = 0;
1693
1694retry:
Jan Kara1f545872005-06-23 22:01:04 -07001695 handle = ext3_journal_start(dir, EXT3_DATA_TRANS_BLOCKS(dir->i_sb) +
Linus Torvalds1da177e2005-04-16 15:20:36 -07001696 EXT3_INDEX_EXTRA_TRANS_BLOCKS + 3 +
Jan Kara1f545872005-06-23 22:01:04 -07001697 2*EXT3_QUOTA_INIT_BLOCKS(dir->i_sb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001698 if (IS_ERR(handle))
1699 return PTR_ERR(handle);
1700
1701 if (IS_DIRSYNC(dir))
1702 handle->h_sync = 1;
1703
1704 inode = ext3_new_inode (handle, dir, mode);
1705 err = PTR_ERR(inode);
1706 if (!IS_ERR(inode)) {
1707 inode->i_op = &ext3_file_inode_operations;
1708 inode->i_fop = &ext3_file_operations;
1709 ext3_set_aops(inode);
1710 err = ext3_add_nondir(handle, dentry, inode);
1711 }
1712 ext3_journal_stop(handle);
1713 if (err == -ENOSPC && ext3_should_retry_alloc(dir->i_sb, &retries))
1714 goto retry;
1715 return err;
1716}
1717
1718static int ext3_mknod (struct inode * dir, struct dentry *dentry,
1719 int mode, dev_t rdev)
1720{
1721 handle_t *handle;
1722 struct inode *inode;
1723 int err, retries = 0;
1724
1725 if (!new_valid_dev(rdev))
1726 return -EINVAL;
1727
1728retry:
Jan Kara1f545872005-06-23 22:01:04 -07001729 handle = ext3_journal_start(dir, EXT3_DATA_TRANS_BLOCKS(dir->i_sb) +
Dave Kleikampe9ad5622006-09-27 01:49:35 -07001730 EXT3_INDEX_EXTRA_TRANS_BLOCKS + 3 +
Jan Kara1f545872005-06-23 22:01:04 -07001731 2*EXT3_QUOTA_INIT_BLOCKS(dir->i_sb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001732 if (IS_ERR(handle))
1733 return PTR_ERR(handle);
1734
1735 if (IS_DIRSYNC(dir))
1736 handle->h_sync = 1;
1737
1738 inode = ext3_new_inode (handle, dir, mode);
1739 err = PTR_ERR(inode);
1740 if (!IS_ERR(inode)) {
1741 init_special_inode(inode, inode->i_mode, rdev);
1742#ifdef CONFIG_EXT3_FS_XATTR
1743 inode->i_op = &ext3_special_inode_operations;
1744#endif
1745 err = ext3_add_nondir(handle, dentry, inode);
1746 }
1747 ext3_journal_stop(handle);
1748 if (err == -ENOSPC && ext3_should_retry_alloc(dir->i_sb, &retries))
1749 goto retry;
1750 return err;
1751}
1752
1753static int ext3_mkdir(struct inode * dir, struct dentry * dentry, int mode)
1754{
1755 handle_t *handle;
1756 struct inode * inode;
1757 struct buffer_head * dir_block;
1758 struct ext3_dir_entry_2 * de;
1759 int err, retries = 0;
1760
1761 if (dir->i_nlink >= EXT3_LINK_MAX)
1762 return -EMLINK;
1763
1764retry:
Jan Kara1f545872005-06-23 22:01:04 -07001765 handle = ext3_journal_start(dir, EXT3_DATA_TRANS_BLOCKS(dir->i_sb) +
Linus Torvalds1da177e2005-04-16 15:20:36 -07001766 EXT3_INDEX_EXTRA_TRANS_BLOCKS + 3 +
Jan Kara1f545872005-06-23 22:01:04 -07001767 2*EXT3_QUOTA_INIT_BLOCKS(dir->i_sb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001768 if (IS_ERR(handle))
1769 return PTR_ERR(handle);
1770
1771 if (IS_DIRSYNC(dir))
1772 handle->h_sync = 1;
1773
1774 inode = ext3_new_inode (handle, dir, S_IFDIR | mode);
1775 err = PTR_ERR(inode);
1776 if (IS_ERR(inode))
1777 goto out_stop;
1778
1779 inode->i_op = &ext3_dir_inode_operations;
1780 inode->i_fop = &ext3_dir_operations;
1781 inode->i_size = EXT3_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1782 dir_block = ext3_bread (handle, inode, 0, 1, &err);
1783 if (!dir_block) {
Dave Hansen9a53c3a2006-09-30 23:29:03 -07001784 drop_nlink(inode); /* is this nlink == 0? */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001785 ext3_mark_inode_dirty(handle, inode);
1786 iput (inode);
1787 goto out_stop;
1788 }
1789 BUFFER_TRACE(dir_block, "get_write_access");
1790 ext3_journal_get_write_access(handle, dir_block);
1791 de = (struct ext3_dir_entry_2 *) dir_block->b_data;
1792 de->inode = cpu_to_le32(inode->i_ino);
1793 de->name_len = 1;
Jan Kara7c06a8d2007-11-14 17:00:19 -08001794 de->rec_len = ext3_rec_len_to_disk(EXT3_DIR_REC_LEN(de->name_len));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001795 strcpy (de->name, ".");
1796 ext3_set_de_type(dir->i_sb, de, S_IFDIR);
Jan Kara7c06a8d2007-11-14 17:00:19 -08001797 de = ext3_next_entry(de);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001798 de->inode = cpu_to_le32(dir->i_ino);
Jan Kara7c06a8d2007-11-14 17:00:19 -08001799 de->rec_len = ext3_rec_len_to_disk(inode->i_sb->s_blocksize -
1800 EXT3_DIR_REC_LEN(1));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001801 de->name_len = 2;
1802 strcpy (de->name, "..");
1803 ext3_set_de_type(dir->i_sb, de, S_IFDIR);
1804 inode->i_nlink = 2;
1805 BUFFER_TRACE(dir_block, "call ext3_journal_dirty_metadata");
1806 ext3_journal_dirty_metadata(handle, dir_block);
1807 brelse (dir_block);
1808 ext3_mark_inode_dirty(handle, inode);
1809 err = ext3_add_entry (handle, dentry, inode);
1810 if (err) {
1811 inode->i_nlink = 0;
1812 ext3_mark_inode_dirty(handle, inode);
1813 iput (inode);
1814 goto out_stop;
1815 }
Dave Hansend8c76e62006-09-30 23:29:04 -07001816 inc_nlink(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001817 ext3_update_dx_flag(dir);
1818 ext3_mark_inode_dirty(handle, dir);
1819 d_instantiate(dentry, inode);
1820out_stop:
1821 ext3_journal_stop(handle);
1822 if (err == -ENOSPC && ext3_should_retry_alloc(dir->i_sb, &retries))
1823 goto retry;
1824 return err;
1825}
1826
1827/*
1828 * routine to check that the specified directory is empty (for rmdir)
1829 */
1830static int empty_dir (struct inode * inode)
1831{
1832 unsigned long offset;
1833 struct buffer_head * bh;
1834 struct ext3_dir_entry_2 * de, * de1;
1835 struct super_block * sb;
1836 int err = 0;
1837
1838 sb = inode->i_sb;
1839 if (inode->i_size < EXT3_DIR_REC_LEN(1) + EXT3_DIR_REC_LEN(2) ||
1840 !(bh = ext3_bread (NULL, inode, 0, 0, &err))) {
1841 if (err)
Harvey Harrisone05b6b52008-04-28 02:16:15 -07001842 ext3_error(inode->i_sb, __func__,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001843 "error %d reading directory #%lu offset 0",
1844 err, inode->i_ino);
1845 else
Harvey Harrisone05b6b52008-04-28 02:16:15 -07001846 ext3_warning(inode->i_sb, __func__,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001847 "bad directory (dir #%lu) - no data block",
1848 inode->i_ino);
1849 return 1;
1850 }
1851 de = (struct ext3_dir_entry_2 *) bh->b_data;
Jan Kara7c06a8d2007-11-14 17:00:19 -08001852 de1 = ext3_next_entry(de);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001853 if (le32_to_cpu(de->inode) != inode->i_ino ||
Mingming Caoae6ddcc2006-09-27 01:49:27 -07001854 !le32_to_cpu(de1->inode) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07001855 strcmp (".", de->name) ||
1856 strcmp ("..", de1->name)) {
Dave Kleikampe9ad5622006-09-27 01:49:35 -07001857 ext3_warning (inode->i_sb, "empty_dir",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001858 "bad directory (dir #%lu) - no `.' or `..'",
1859 inode->i_ino);
1860 brelse (bh);
1861 return 1;
1862 }
Jan Kara7c06a8d2007-11-14 17:00:19 -08001863 offset = ext3_rec_len_from_disk(de->rec_len) +
1864 ext3_rec_len_from_disk(de1->rec_len);
1865 de = ext3_next_entry(de1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001866 while (offset < inode->i_size ) {
1867 if (!bh ||
1868 (void *) de >= (void *) (bh->b_data+sb->s_blocksize)) {
1869 err = 0;
1870 brelse (bh);
1871 bh = ext3_bread (NULL, inode,
1872 offset >> EXT3_BLOCK_SIZE_BITS(sb), 0, &err);
1873 if (!bh) {
1874 if (err)
Harvey Harrisone05b6b52008-04-28 02:16:15 -07001875 ext3_error(sb, __func__,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001876 "error %d reading directory"
1877 " #%lu offset %lu",
1878 err, inode->i_ino, offset);
1879 offset += sb->s_blocksize;
1880 continue;
1881 }
1882 de = (struct ext3_dir_entry_2 *) bh->b_data;
1883 }
1884 if (!ext3_check_dir_entry("empty_dir", inode, de, bh, offset)) {
1885 de = (struct ext3_dir_entry_2 *)(bh->b_data +
1886 sb->s_blocksize);
1887 offset = (offset | (sb->s_blocksize - 1)) + 1;
1888 continue;
1889 }
1890 if (le32_to_cpu(de->inode)) {
1891 brelse (bh);
1892 return 0;
1893 }
Jan Kara7c06a8d2007-11-14 17:00:19 -08001894 offset += ext3_rec_len_from_disk(de->rec_len);
1895 de = ext3_next_entry(de);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001896 }
1897 brelse (bh);
1898 return 1;
1899}
1900
1901/* ext3_orphan_add() links an unlinked or truncated inode into a list of
1902 * such inodes, starting at the superblock, in case we crash before the
1903 * file is closed/deleted, or in case the inode truncate spans multiple
1904 * transactions and the last transaction is not recovered after a crash.
1905 *
1906 * At filesystem recovery time, we walk this list deleting unlinked
1907 * inodes and truncating linked inodes in ext3_orphan_cleanup().
1908 */
1909int ext3_orphan_add(handle_t *handle, struct inode *inode)
1910{
1911 struct super_block *sb = inode->i_sb;
1912 struct ext3_iloc iloc;
1913 int err = 0, rc;
1914
1915 lock_super(sb);
1916 if (!list_empty(&EXT3_I(inode)->i_orphan))
1917 goto out_unlock;
1918
1919 /* Orphan handling is only valid for files with data blocks
1920 * being truncated, or files being unlinked. */
1921
1922 /* @@@ FIXME: Observation from aviro:
Mingming Caoae6ddcc2006-09-27 01:49:27 -07001923 * I think I can trigger J_ASSERT in ext3_orphan_add(). We block
Linus Torvalds1da177e2005-04-16 15:20:36 -07001924 * here (on lock_super()), so race with ext3_link() which might bump
1925 * ->i_nlink. For, say it, character device. Not a regular file,
1926 * not a directory, not a symlink and ->i_nlink > 0.
1927 */
1928 J_ASSERT ((S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1929 S_ISLNK(inode->i_mode)) || inode->i_nlink == 0);
1930
1931 BUFFER_TRACE(EXT3_SB(sb)->s_sbh, "get_write_access");
1932 err = ext3_journal_get_write_access(handle, EXT3_SB(sb)->s_sbh);
1933 if (err)
1934 goto out_unlock;
1935
1936 err = ext3_reserve_inode_write(handle, inode, &iloc);
1937 if (err)
1938 goto out_unlock;
1939
1940 /* Insert this inode at the head of the on-disk orphan list... */
1941 NEXT_ORPHAN(inode) = le32_to_cpu(EXT3_SB(sb)->s_es->s_last_orphan);
1942 EXT3_SB(sb)->s_es->s_last_orphan = cpu_to_le32(inode->i_ino);
1943 err = ext3_journal_dirty_metadata(handle, EXT3_SB(sb)->s_sbh);
1944 rc = ext3_mark_iloc_dirty(handle, inode, &iloc);
1945 if (!err)
1946 err = rc;
1947
1948 /* Only add to the head of the in-memory list if all the
1949 * previous operations succeeded. If the orphan_add is going to
1950 * fail (possibly taking the journal offline), we can't risk
1951 * leaving the inode on the orphan list: stray orphan-list
1952 * entries can cause panics at unmount time.
1953 *
1954 * This is safe: on error we're going to ignore the orphan list
1955 * anyway on the next recovery. */
1956 if (!err)
1957 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1958
Eric Sandeeneee194e2006-09-27 01:49:30 -07001959 jbd_debug(4, "superblock will point to %lu\n", inode->i_ino);
1960 jbd_debug(4, "orphan inode %lu will point to %d\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001961 inode->i_ino, NEXT_ORPHAN(inode));
1962out_unlock:
1963 unlock_super(sb);
1964 ext3_std_error(inode->i_sb, err);
1965 return err;
1966}
1967
1968/*
1969 * ext3_orphan_del() removes an unlinked or truncated inode from the list
1970 * of such inodes stored on disk, because it is finally being cleaned up.
1971 */
1972int ext3_orphan_del(handle_t *handle, struct inode *inode)
1973{
1974 struct list_head *prev;
1975 struct ext3_inode_info *ei = EXT3_I(inode);
1976 struct ext3_sb_info *sbi;
1977 unsigned long ino_next;
1978 struct ext3_iloc iloc;
1979 int err = 0;
1980
1981 lock_super(inode->i_sb);
1982 if (list_empty(&ei->i_orphan)) {
1983 unlock_super(inode->i_sb);
1984 return 0;
1985 }
1986
1987 ino_next = NEXT_ORPHAN(inode);
1988 prev = ei->i_orphan.prev;
1989 sbi = EXT3_SB(inode->i_sb);
1990
1991 jbd_debug(4, "remove inode %lu from orphan list\n", inode->i_ino);
1992
1993 list_del_init(&ei->i_orphan);
1994
1995 /* If we're on an error path, we may not have a valid
1996 * transaction handle with which to update the orphan list on
1997 * disk, but we still need to remove the inode from the linked
1998 * list in memory. */
1999 if (!handle)
2000 goto out;
2001
2002 err = ext3_reserve_inode_write(handle, inode, &iloc);
2003 if (err)
2004 goto out_err;
2005
2006 if (prev == &sbi->s_orphan) {
2007 jbd_debug(4, "superblock will point to %lu\n", ino_next);
2008 BUFFER_TRACE(sbi->s_sbh, "get_write_access");
2009 err = ext3_journal_get_write_access(handle, sbi->s_sbh);
2010 if (err)
2011 goto out_brelse;
2012 sbi->s_es->s_last_orphan = cpu_to_le32(ino_next);
2013 err = ext3_journal_dirty_metadata(handle, sbi->s_sbh);
2014 } else {
2015 struct ext3_iloc iloc2;
2016 struct inode *i_prev =
2017 &list_entry(prev, struct ext3_inode_info, i_orphan)->vfs_inode;
2018
2019 jbd_debug(4, "orphan inode %lu will point to %lu\n",
2020 i_prev->i_ino, ino_next);
2021 err = ext3_reserve_inode_write(handle, i_prev, &iloc2);
2022 if (err)
2023 goto out_brelse;
2024 NEXT_ORPHAN(i_prev) = ino_next;
2025 err = ext3_mark_iloc_dirty(handle, i_prev, &iloc2);
2026 }
2027 if (err)
2028 goto out_brelse;
2029 NEXT_ORPHAN(inode) = 0;
2030 err = ext3_mark_iloc_dirty(handle, inode, &iloc);
2031
2032out_err:
2033 ext3_std_error(inode->i_sb, err);
2034out:
2035 unlock_super(inode->i_sb);
2036 return err;
2037
2038out_brelse:
2039 brelse(iloc.bh);
2040 goto out_err;
2041}
2042
2043static int ext3_rmdir (struct inode * dir, struct dentry *dentry)
2044{
2045 int retval;
2046 struct inode * inode;
2047 struct buffer_head * bh;
2048 struct ext3_dir_entry_2 * de;
2049 handle_t *handle;
2050
2051 /* Initialize quotas before so that eventual writes go in
2052 * separate transaction */
2053 DQUOT_INIT(dentry->d_inode);
Jan Kara1f545872005-06-23 22:01:04 -07002054 handle = ext3_journal_start(dir, EXT3_DELETE_TRANS_BLOCKS(dir->i_sb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002055 if (IS_ERR(handle))
2056 return PTR_ERR(handle);
2057
2058 retval = -ENOENT;
2059 bh = ext3_find_entry (dentry, &de);
2060 if (!bh)
2061 goto end_rmdir;
2062
2063 if (IS_DIRSYNC(dir))
2064 handle->h_sync = 1;
2065
2066 inode = dentry->d_inode;
2067
2068 retval = -EIO;
2069 if (le32_to_cpu(de->inode) != inode->i_ino)
2070 goto end_rmdir;
2071
2072 retval = -ENOTEMPTY;
2073 if (!empty_dir (inode))
2074 goto end_rmdir;
2075
2076 retval = ext3_delete_entry(handle, dir, de, bh);
2077 if (retval)
2078 goto end_rmdir;
2079 if (inode->i_nlink != 2)
2080 ext3_warning (inode->i_sb, "ext3_rmdir",
2081 "empty directory has nlink!=2 (%d)",
2082 inode->i_nlink);
2083 inode->i_version++;
Dave Hansence71ec32006-09-30 23:29:06 -07002084 clear_nlink(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002085 /* There's no need to set i_disksize: the fact that i_nlink is
2086 * zero will ensure that the right thing happens during any
2087 * recovery. */
2088 inode->i_size = 0;
2089 ext3_orphan_add(handle, inode);
2090 inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME_SEC;
2091 ext3_mark_inode_dirty(handle, inode);
Dave Hansen9a53c3a2006-09-30 23:29:03 -07002092 drop_nlink(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002093 ext3_update_dx_flag(dir);
2094 ext3_mark_inode_dirty(handle, dir);
2095
2096end_rmdir:
2097 ext3_journal_stop(handle);
2098 brelse (bh);
2099 return retval;
2100}
2101
2102static int ext3_unlink(struct inode * dir, struct dentry *dentry)
2103{
2104 int retval;
2105 struct inode * inode;
2106 struct buffer_head * bh;
2107 struct ext3_dir_entry_2 * de;
2108 handle_t *handle;
2109
2110 /* Initialize quotas before so that eventual writes go
2111 * in separate transaction */
2112 DQUOT_INIT(dentry->d_inode);
Jan Kara1f545872005-06-23 22:01:04 -07002113 handle = ext3_journal_start(dir, EXT3_DELETE_TRANS_BLOCKS(dir->i_sb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002114 if (IS_ERR(handle))
2115 return PTR_ERR(handle);
2116
2117 if (IS_DIRSYNC(dir))
2118 handle->h_sync = 1;
2119
2120 retval = -ENOENT;
2121 bh = ext3_find_entry (dentry, &de);
2122 if (!bh)
2123 goto end_unlink;
2124
2125 inode = dentry->d_inode;
2126
2127 retval = -EIO;
2128 if (le32_to_cpu(de->inode) != inode->i_ino)
2129 goto end_unlink;
2130
2131 if (!inode->i_nlink) {
2132 ext3_warning (inode->i_sb, "ext3_unlink",
2133 "Deleting nonexistent file (%lu), %d",
2134 inode->i_ino, inode->i_nlink);
2135 inode->i_nlink = 1;
2136 }
2137 retval = ext3_delete_entry(handle, dir, de, bh);
2138 if (retval)
2139 goto end_unlink;
2140 dir->i_ctime = dir->i_mtime = CURRENT_TIME_SEC;
2141 ext3_update_dx_flag(dir);
2142 ext3_mark_inode_dirty(handle, dir);
Dave Hansen9a53c3a2006-09-30 23:29:03 -07002143 drop_nlink(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002144 if (!inode->i_nlink)
2145 ext3_orphan_add(handle, inode);
2146 inode->i_ctime = dir->i_ctime;
2147 ext3_mark_inode_dirty(handle, inode);
2148 retval = 0;
2149
2150end_unlink:
2151 ext3_journal_stop(handle);
2152 brelse (bh);
2153 return retval;
2154}
2155
2156static int ext3_symlink (struct inode * dir,
2157 struct dentry *dentry, const char * symname)
2158{
2159 handle_t *handle;
2160 struct inode * inode;
2161 int l, err, retries = 0;
2162
2163 l = strlen(symname)+1;
2164 if (l > dir->i_sb->s_blocksize)
2165 return -ENAMETOOLONG;
2166
2167retry:
Jan Kara1f545872005-06-23 22:01:04 -07002168 handle = ext3_journal_start(dir, EXT3_DATA_TRANS_BLOCKS(dir->i_sb) +
Dave Kleikampe9ad5622006-09-27 01:49:35 -07002169 EXT3_INDEX_EXTRA_TRANS_BLOCKS + 5 +
Jan Kara1f545872005-06-23 22:01:04 -07002170 2*EXT3_QUOTA_INIT_BLOCKS(dir->i_sb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002171 if (IS_ERR(handle))
2172 return PTR_ERR(handle);
2173
2174 if (IS_DIRSYNC(dir))
2175 handle->h_sync = 1;
2176
2177 inode = ext3_new_inode (handle, dir, S_IFLNK|S_IRWXUGO);
2178 err = PTR_ERR(inode);
2179 if (IS_ERR(inode))
2180 goto out_stop;
2181
2182 if (l > sizeof (EXT3_I(inode)->i_data)) {
2183 inode->i_op = &ext3_symlink_inode_operations;
2184 ext3_set_aops(inode);
2185 /*
2186 * page_symlink() calls into ext3_prepare/commit_write.
2187 * We have a transaction open. All is sweetness. It also sets
2188 * i_size in generic_commit_write().
2189 */
Kirill Korotaev0adb25d2006-03-11 03:27:13 -08002190 err = __page_symlink(inode, symname, l,
2191 mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002192 if (err) {
Eric Sandeen731b9a52007-02-10 01:46:16 -08002193 drop_nlink(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002194 ext3_mark_inode_dirty(handle, inode);
2195 iput (inode);
2196 goto out_stop;
2197 }
2198 } else {
2199 inode->i_op = &ext3_fast_symlink_inode_operations;
2200 memcpy((char*)&EXT3_I(inode)->i_data,symname,l);
2201 inode->i_size = l-1;
2202 }
2203 EXT3_I(inode)->i_disksize = inode->i_size;
2204 err = ext3_add_nondir(handle, dentry, inode);
2205out_stop:
2206 ext3_journal_stop(handle);
2207 if (err == -ENOSPC && ext3_should_retry_alloc(dir->i_sb, &retries))
2208 goto retry;
2209 return err;
2210}
2211
2212static int ext3_link (struct dentry * old_dentry,
2213 struct inode * dir, struct dentry *dentry)
2214{
2215 handle_t *handle;
2216 struct inode *inode = old_dentry->d_inode;
2217 int err, retries = 0;
2218
2219 if (inode->i_nlink >= EXT3_LINK_MAX)
2220 return -EMLINK;
Eric Sandeen2988a772007-02-10 01:46:16 -08002221 /*
2222 * Return -ENOENT if we've raced with unlink and i_nlink is 0. Doing
2223 * otherwise has the potential to corrupt the orphan inode list.
2224 */
2225 if (inode->i_nlink == 0)
2226 return -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002227
2228retry:
Jan Kara1f545872005-06-23 22:01:04 -07002229 handle = ext3_journal_start(dir, EXT3_DATA_TRANS_BLOCKS(dir->i_sb) +
Linus Torvalds1da177e2005-04-16 15:20:36 -07002230 EXT3_INDEX_EXTRA_TRANS_BLOCKS);
2231 if (IS_ERR(handle))
2232 return PTR_ERR(handle);
2233
2234 if (IS_DIRSYNC(dir))
2235 handle->h_sync = 1;
2236
2237 inode->i_ctime = CURRENT_TIME_SEC;
Eric Sandeen731b9a52007-02-10 01:46:16 -08002238 inc_nlink(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002239 atomic_inc(&inode->i_count);
2240
2241 err = ext3_add_nondir(handle, dentry, inode);
2242 ext3_journal_stop(handle);
2243 if (err == -ENOSPC && ext3_should_retry_alloc(dir->i_sb, &retries))
2244 goto retry;
2245 return err;
2246}
2247
2248#define PARENT_INO(buffer) \
Jan Kara7c06a8d2007-11-14 17:00:19 -08002249 (ext3_next_entry((struct ext3_dir_entry_2 *)(buffer))->inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002250
2251/*
2252 * Anybody can rename anything with this: the permission checks are left to the
2253 * higher-level routines.
2254 */
2255static int ext3_rename (struct inode * old_dir, struct dentry *old_dentry,
2256 struct inode * new_dir,struct dentry *new_dentry)
2257{
2258 handle_t *handle;
2259 struct inode * old_inode, * new_inode;
2260 struct buffer_head * old_bh, * new_bh, * dir_bh;
2261 struct ext3_dir_entry_2 * old_de, * new_de;
2262 int retval;
2263
2264 old_bh = new_bh = dir_bh = NULL;
2265
2266 /* Initialize quotas before so that eventual writes go
2267 * in separate transaction */
2268 if (new_dentry->d_inode)
2269 DQUOT_INIT(new_dentry->d_inode);
Jan Kara1f545872005-06-23 22:01:04 -07002270 handle = ext3_journal_start(old_dir, 2 *
2271 EXT3_DATA_TRANS_BLOCKS(old_dir->i_sb) +
Dave Kleikampe9ad5622006-09-27 01:49:35 -07002272 EXT3_INDEX_EXTRA_TRANS_BLOCKS + 2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002273 if (IS_ERR(handle))
2274 return PTR_ERR(handle);
2275
2276 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
2277 handle->h_sync = 1;
2278
2279 old_bh = ext3_find_entry (old_dentry, &old_de);
2280 /*
2281 * Check for inode number is _not_ due to possible IO errors.
2282 * We might rmdir the source, keep it as pwd of some process
2283 * and merrily kill the link to whatever was created under the
2284 * same name. Goodbye sticky bit ;-<
2285 */
2286 old_inode = old_dentry->d_inode;
2287 retval = -ENOENT;
2288 if (!old_bh || le32_to_cpu(old_de->inode) != old_inode->i_ino)
2289 goto end_rename;
2290
2291 new_inode = new_dentry->d_inode;
2292 new_bh = ext3_find_entry (new_dentry, &new_de);
2293 if (new_bh) {
2294 if (!new_inode) {
2295 brelse (new_bh);
2296 new_bh = NULL;
2297 }
2298 }
2299 if (S_ISDIR(old_inode->i_mode)) {
2300 if (new_inode) {
2301 retval = -ENOTEMPTY;
2302 if (!empty_dir (new_inode))
2303 goto end_rename;
2304 }
2305 retval = -EIO;
2306 dir_bh = ext3_bread (handle, old_inode, 0, 0, &retval);
2307 if (!dir_bh)
2308 goto end_rename;
2309 if (le32_to_cpu(PARENT_INO(dir_bh->b_data)) != old_dir->i_ino)
2310 goto end_rename;
2311 retval = -EMLINK;
2312 if (!new_inode && new_dir!=old_dir &&
2313 new_dir->i_nlink >= EXT3_LINK_MAX)
2314 goto end_rename;
2315 }
2316 if (!new_bh) {
2317 retval = ext3_add_entry (handle, new_dentry, old_inode);
2318 if (retval)
2319 goto end_rename;
2320 } else {
2321 BUFFER_TRACE(new_bh, "get write access");
2322 ext3_journal_get_write_access(handle, new_bh);
2323 new_de->inode = cpu_to_le32(old_inode->i_ino);
2324 if (EXT3_HAS_INCOMPAT_FEATURE(new_dir->i_sb,
2325 EXT3_FEATURE_INCOMPAT_FILETYPE))
2326 new_de->file_type = old_de->file_type;
2327 new_dir->i_version++;
Jan Kara0b230762008-04-28 02:16:12 -07002328 new_dir->i_ctime = new_dir->i_mtime = CURRENT_TIME_SEC;
2329 ext3_mark_inode_dirty(handle, new_dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002330 BUFFER_TRACE(new_bh, "call ext3_journal_dirty_metadata");
2331 ext3_journal_dirty_metadata(handle, new_bh);
2332 brelse(new_bh);
2333 new_bh = NULL;
2334 }
2335
2336 /*
2337 * Like most other Unix systems, set the ctime for inodes on a
2338 * rename.
2339 */
2340 old_inode->i_ctime = CURRENT_TIME_SEC;
2341 ext3_mark_inode_dirty(handle, old_inode);
2342
2343 /*
2344 * ok, that's it
2345 */
2346 if (le32_to_cpu(old_de->inode) != old_inode->i_ino ||
2347 old_de->name_len != old_dentry->d_name.len ||
2348 strncmp(old_de->name, old_dentry->d_name.name, old_de->name_len) ||
2349 (retval = ext3_delete_entry(handle, old_dir,
2350 old_de, old_bh)) == -ENOENT) {
2351 /* old_de could have moved from under us during htree split, so
2352 * make sure that we are deleting the right entry. We might
2353 * also be pointing to a stale entry in the unused part of
2354 * old_bh so just checking inum and the name isn't enough. */
2355 struct buffer_head *old_bh2;
2356 struct ext3_dir_entry_2 *old_de2;
2357
2358 old_bh2 = ext3_find_entry(old_dentry, &old_de2);
2359 if (old_bh2) {
2360 retval = ext3_delete_entry(handle, old_dir,
2361 old_de2, old_bh2);
2362 brelse(old_bh2);
2363 }
2364 }
2365 if (retval) {
2366 ext3_warning(old_dir->i_sb, "ext3_rename",
2367 "Deleting old file (%lu), %d, error=%d",
2368 old_dir->i_ino, old_dir->i_nlink, retval);
2369 }
2370
2371 if (new_inode) {
Dave Hansen9a53c3a2006-09-30 23:29:03 -07002372 drop_nlink(new_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002373 new_inode->i_ctime = CURRENT_TIME_SEC;
2374 }
2375 old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME_SEC;
2376 ext3_update_dx_flag(old_dir);
2377 if (dir_bh) {
2378 BUFFER_TRACE(dir_bh, "get_write_access");
2379 ext3_journal_get_write_access(handle, dir_bh);
2380 PARENT_INO(dir_bh->b_data) = cpu_to_le32(new_dir->i_ino);
2381 BUFFER_TRACE(dir_bh, "call ext3_journal_dirty_metadata");
2382 ext3_journal_dirty_metadata(handle, dir_bh);
Dave Hansen9a53c3a2006-09-30 23:29:03 -07002383 drop_nlink(old_dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002384 if (new_inode) {
Dave Hansen9a53c3a2006-09-30 23:29:03 -07002385 drop_nlink(new_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002386 } else {
Dave Hansend8c76e62006-09-30 23:29:04 -07002387 inc_nlink(new_dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002388 ext3_update_dx_flag(new_dir);
2389 ext3_mark_inode_dirty(handle, new_dir);
2390 }
2391 }
2392 ext3_mark_inode_dirty(handle, old_dir);
2393 if (new_inode) {
2394 ext3_mark_inode_dirty(handle, new_inode);
2395 if (!new_inode->i_nlink)
2396 ext3_orphan_add(handle, new_inode);
2397 }
2398 retval = 0;
2399
2400end_rename:
2401 brelse (dir_bh);
2402 brelse (old_bh);
2403 brelse (new_bh);
2404 ext3_journal_stop(handle);
2405 return retval;
2406}
2407
2408/*
2409 * directories can handle most operations...
2410 */
Arjan van de Ven754661f2007-02-12 00:55:38 -08002411const struct inode_operations ext3_dir_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002412 .create = ext3_create,
2413 .lookup = ext3_lookup,
2414 .link = ext3_link,
2415 .unlink = ext3_unlink,
2416 .symlink = ext3_symlink,
2417 .mkdir = ext3_mkdir,
2418 .rmdir = ext3_rmdir,
2419 .mknod = ext3_mknod,
2420 .rename = ext3_rename,
2421 .setattr = ext3_setattr,
2422#ifdef CONFIG_EXT3_FS_XATTR
2423 .setxattr = generic_setxattr,
2424 .getxattr = generic_getxattr,
2425 .listxattr = ext3_listxattr,
2426 .removexattr = generic_removexattr,
2427#endif
2428 .permission = ext3_permission,
2429};
2430
Arjan van de Ven754661f2007-02-12 00:55:38 -08002431const struct inode_operations ext3_special_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002432 .setattr = ext3_setattr,
2433#ifdef CONFIG_EXT3_FS_XATTR
2434 .setxattr = generic_setxattr,
2435 .getxattr = generic_getxattr,
2436 .listxattr = ext3_listxattr,
2437 .removexattr = generic_removexattr,
2438#endif
2439 .permission = ext3_permission,
Mingming Caoae6ddcc2006-09-27 01:49:27 -07002440};