blob: f197736dccfa16cca207fecb81e6445a18e96973 [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
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include <linux/quotaops.h>
Al Viro4613ad12012-03-29 22:30:07 -040028#include "ext3.h"
Ben Dooks381be2542005-10-30 15:02:56 -080029#include "namei.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include "xattr.h"
31#include "acl.h"
32
33/*
34 * define how far ahead to read directories while searching them.
35 */
36#define NAMEI_RA_CHUNKS 2
37#define NAMEI_RA_BLOCKS 4
38#define NAMEI_RA_SIZE (NAMEI_RA_CHUNKS * NAMEI_RA_BLOCKS)
Linus Torvalds1da177e2005-04-16 15:20:36 -070039
40static struct buffer_head *ext3_append(handle_t *handle,
41 struct inode *inode,
42 u32 *block, int *err)
43{
44 struct buffer_head *bh;
45
46 *block = inode->i_size >> inode->i_sb->s_blocksize_bits;
47
Carlos Maiolinoc3d59ad2012-10-02 23:59:23 -030048 if ((bh = ext3_dir_bread(handle, inode, *block, 1, err))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070049 inode->i_size += inode->i_sb->s_blocksize;
50 EXT3_I(inode)->i_disksize = inode->i_size;
Akinobu Mita33575f82008-04-28 02:16:08 -070051 *err = ext3_journal_get_write_access(handle, bh);
52 if (*err) {
53 brelse(bh);
54 bh = NULL;
55 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070056 }
57 return bh;
58}
59
60#ifndef assert
61#define assert(test) J_ASSERT(test)
62#endif
63
Linus Torvalds1da177e2005-04-16 15:20:36 -070064#ifdef DX_DEBUG
65#define dxtrace(command) command
66#else
Mingming Caoae6ddcc2006-09-27 01:49:27 -070067#define dxtrace(command)
Linus Torvalds1da177e2005-04-16 15:20:36 -070068#endif
69
70struct fake_dirent
71{
72 __le32 inode;
73 __le16 rec_len;
74 u8 name_len;
75 u8 file_type;
76};
77
78struct dx_countlimit
79{
80 __le16 limit;
81 __le16 count;
82};
83
84struct dx_entry
85{
86 __le32 hash;
87 __le32 block;
88};
89
90/*
91 * dx_root_info is laid out so that if it should somehow get overlaid by a
92 * dirent the two low bits of the hash version will be zero. Therefore, the
93 * hash version mod 4 should never be 0. Sincerely, the paranoia department.
94 */
95
96struct dx_root
97{
98 struct fake_dirent dot;
99 char dot_name[4];
100 struct fake_dirent dotdot;
101 char dotdot_name[4];
102 struct dx_root_info
103 {
104 __le32 reserved_zero;
105 u8 hash_version;
106 u8 info_length; /* 8 */
107 u8 indirect_levels;
108 u8 unused_flags;
109 }
110 info;
111 struct dx_entry entries[0];
112};
113
114struct dx_node
115{
116 struct fake_dirent fake;
117 struct dx_entry entries[0];
118};
119
120
121struct dx_frame
122{
123 struct buffer_head *bh;
124 struct dx_entry *entries;
125 struct dx_entry *at;
126};
127
128struct dx_map_entry
129{
130 u32 hash;
Eric Sandeenef2b02d2007-09-18 22:46:42 -0700131 u16 offs;
132 u16 size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133};
134
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135static inline unsigned dx_get_block (struct dx_entry *entry);
136static void dx_set_block (struct dx_entry *entry, unsigned value);
137static inline unsigned dx_get_hash (struct dx_entry *entry);
138static void dx_set_hash (struct dx_entry *entry, unsigned value);
139static unsigned dx_get_count (struct dx_entry *entries);
140static unsigned dx_get_limit (struct dx_entry *entries);
141static void dx_set_count (struct dx_entry *entries, unsigned value);
142static void dx_set_limit (struct dx_entry *entries, unsigned value);
143static unsigned dx_root_limit (struct inode *dir, unsigned infosize);
144static unsigned dx_node_limit (struct inode *dir);
Al Viro734711a2008-08-24 07:26:48 -0400145static struct dx_frame *dx_probe(struct qstr *entry,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 struct inode *dir,
147 struct dx_hash_info *hinfo,
148 struct dx_frame *frame,
149 int *err);
150static void dx_release (struct dx_frame *frames);
Wei Yongjun45f90212009-04-02 16:57:14 -0700151static int dx_make_map(struct ext3_dir_entry_2 *de, unsigned blocksize,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 struct dx_hash_info *hinfo, struct dx_map_entry map[]);
153static void dx_sort_map(struct dx_map_entry *map, unsigned count);
154static struct ext3_dir_entry_2 *dx_move_dirents (char *from, char *to,
155 struct dx_map_entry *offsets, int count);
Wei Yongjun45f90212009-04-02 16:57:14 -0700156static struct ext3_dir_entry_2 *dx_pack_dirents(char *base, unsigned blocksize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157static void dx_insert_block (struct dx_frame *frame, u32 hash, u32 block);
158static int ext3_htree_next_block(struct inode *dir, __u32 hash,
159 struct dx_frame *frame,
Mingming Caoae6ddcc2006-09-27 01:49:27 -0700160 struct dx_frame *frames,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 __u32 *start_hash);
Al Viro734711a2008-08-24 07:26:48 -0400162static struct buffer_head * ext3_dx_find_entry(struct inode *dir,
163 struct qstr *entry, struct ext3_dir_entry_2 **res_dir,
164 int *err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165static int ext3_dx_add_entry(handle_t *handle, struct dentry *dentry,
166 struct inode *inode);
167
168/*
Jan Kara7c06a8d2007-11-14 17:00:19 -0800169 * p is at least 6 bytes before the end of page
170 */
171static inline struct ext3_dir_entry_2 *
172ext3_next_entry(struct ext3_dir_entry_2 *p)
173{
174 return (struct ext3_dir_entry_2 *)((char *)p +
175 ext3_rec_len_from_disk(p->rec_len));
176}
177
178/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 * Future: use high four bits of block for coalesce-on-delete flags
180 * Mask them off for now.
181 */
182
183static inline unsigned dx_get_block (struct dx_entry *entry)
184{
185 return le32_to_cpu(entry->block) & 0x00ffffff;
186}
187
188static inline void dx_set_block (struct dx_entry *entry, unsigned value)
189{
190 entry->block = cpu_to_le32(value);
191}
192
193static inline unsigned dx_get_hash (struct dx_entry *entry)
194{
195 return le32_to_cpu(entry->hash);
196}
197
198static inline void dx_set_hash (struct dx_entry *entry, unsigned value)
199{
200 entry->hash = cpu_to_le32(value);
201}
202
203static inline unsigned dx_get_count (struct dx_entry *entries)
204{
205 return le16_to_cpu(((struct dx_countlimit *) entries)->count);
206}
207
208static inline unsigned dx_get_limit (struct dx_entry *entries)
209{
210 return le16_to_cpu(((struct dx_countlimit *) entries)->limit);
211}
212
213static inline void dx_set_count (struct dx_entry *entries, unsigned value)
214{
215 ((struct dx_countlimit *) entries)->count = cpu_to_le16(value);
216}
217
218static inline void dx_set_limit (struct dx_entry *entries, unsigned value)
219{
220 ((struct dx_countlimit *) entries)->limit = cpu_to_le16(value);
221}
222
223static inline unsigned dx_root_limit (struct inode *dir, unsigned infosize)
224{
225 unsigned entry_space = dir->i_sb->s_blocksize - EXT3_DIR_REC_LEN(1) -
226 EXT3_DIR_REC_LEN(2) - infosize;
Li Zefan8ef27202008-07-25 01:46:29 -0700227 return entry_space / sizeof(struct dx_entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228}
229
230static inline unsigned dx_node_limit (struct inode *dir)
231{
232 unsigned entry_space = dir->i_sb->s_blocksize - EXT3_DIR_REC_LEN(0);
Li Zefan8ef27202008-07-25 01:46:29 -0700233 return entry_space / sizeof(struct dx_entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234}
235
236/*
237 * Debug
238 */
239#ifdef DX_DEBUG
240static void dx_show_index (char * label, struct dx_entry *entries)
241{
242 int i, n = dx_get_count (entries);
243 printk("%s index ", label);
244 for (i = 0; i < n; i++)
245 {
246 printk("%x->%u ", i? dx_get_hash(entries + i): 0, dx_get_block(entries + i));
247 }
248 printk("\n");
249}
250
251struct stats
Mingming Caoae6ddcc2006-09-27 01:49:27 -0700252{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 unsigned names;
254 unsigned space;
255 unsigned bcount;
256};
257
258static struct stats dx_show_leaf(struct dx_hash_info *hinfo, struct ext3_dir_entry_2 *de,
259 int size, int show_names)
260{
261 unsigned names = 0, space = 0;
262 char *base = (char *) de;
263 struct dx_hash_info h = *hinfo;
264
265 printk("names: ");
266 while ((char *) de < base + size)
267 {
268 if (de->inode)
269 {
270 if (show_names)
271 {
272 int len = de->name_len;
273 char *name = de->name;
274 while (len--) printk("%c", *name++);
275 ext3fs_dirhash(de->name, de->name_len, &h);
276 printk(":%x.%u ", h.hash,
Bernd Schubertc878c732011-07-20 23:16:33 +0200277 (unsigned) ((char *) de - base));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278 }
279 space += EXT3_DIR_REC_LEN(de->name_len);
Dave Kleikampe9ad5622006-09-27 01:49:35 -0700280 names++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 }
Jan Kara7c06a8d2007-11-14 17:00:19 -0800282 de = ext3_next_entry(de);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 }
284 printk("(%i)\n", names);
285 return (struct stats) { names, space, 1 };
286}
287
288struct stats dx_show_entries(struct dx_hash_info *hinfo, struct inode *dir,
289 struct dx_entry *entries, int levels)
290{
291 unsigned blocksize = dir->i_sb->s_blocksize;
292 unsigned count = dx_get_count (entries), names = 0, space = 0, i;
293 unsigned bcount = 0;
294 struct buffer_head *bh;
295 int err;
296 printk("%i indexed blocks...\n", count);
297 for (i = 0; i < count; i++, entries++)
298 {
299 u32 block = dx_get_block(entries), hash = i? dx_get_hash(entries): 0;
300 u32 range = i < count - 1? (dx_get_hash(entries + 1) - hash): ~hash;
301 struct stats stats;
302 printk("%s%3u:%03u hash %8x/%8x ",levels?"":" ", i, block, hash, range);
303 if (!(bh = ext3_bread (NULL,dir, block, 0,&err))) continue;
304 stats = levels?
305 dx_show_entries(hinfo, dir, ((struct dx_node *) bh->b_data)->entries, levels - 1):
306 dx_show_leaf(hinfo, (struct ext3_dir_entry_2 *) bh->b_data, blocksize, 0);
307 names += stats.names;
308 space += stats.space;
309 bcount += stats.bcount;
310 brelse (bh);
311 }
312 if (bcount)
313 printk("%snames %u, fullness %u (%u%%)\n", levels?"":" ",
314 names, space/bcount,(space/bcount)*100/blocksize);
315 return (struct stats) { names, space, bcount};
316}
317#endif /* DX_DEBUG */
318
319/*
320 * Probe for a directory leaf block to search.
321 *
322 * dx_probe can return ERR_BAD_DX_DIR, which means there was a format
323 * error in the directory index, and the caller should fall back to
324 * searching the directory normally. The callers of dx_probe **MUST**
325 * check for this error code, and make sure it never gets reflected
326 * back to userspace.
327 */
328static struct dx_frame *
Al Viro734711a2008-08-24 07:26:48 -0400329dx_probe(struct qstr *entry, struct inode *dir,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330 struct dx_hash_info *hinfo, struct dx_frame *frame_in, int *err)
331{
332 unsigned count, indirect;
333 struct dx_entry *at, *entries, *p, *q, *m;
334 struct dx_root *root;
335 struct buffer_head *bh;
336 struct dx_frame *frame = frame_in;
337 u32 hash;
338
339 frame->bh = NULL;
Carlos Maiolinoc3d59ad2012-10-02 23:59:23 -0300340 if (!(bh = ext3_dir_bread(NULL, dir, 0, 0, err))) {
341 *err = ERR_BAD_DX_DIR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 goto fail;
Carlos Maiolinoc3d59ad2012-10-02 23:59:23 -0300343 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 root = (struct dx_root *) bh->b_data;
345 if (root->info.hash_version != DX_HASH_TEA &&
346 root->info.hash_version != DX_HASH_HALF_MD4 &&
347 root->info.hash_version != DX_HASH_LEGACY) {
Harvey Harrisone05b6b52008-04-28 02:16:15 -0700348 ext3_warning(dir->i_sb, __func__,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 "Unrecognised inode hash code %d",
350 root->info.hash_version);
351 brelse(bh);
352 *err = ERR_BAD_DX_DIR;
353 goto fail;
354 }
355 hinfo->hash_version = root->info.hash_version;
Theodore Ts'o5e1f8c92008-10-28 13:21:55 -0400356 if (hinfo->hash_version <= DX_HASH_TEA)
357 hinfo->hash_version += EXT3_SB(dir->i_sb)->s_hash_unsigned;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 hinfo->seed = EXT3_SB(dir->i_sb)->s_hash_seed;
Al Viro734711a2008-08-24 07:26:48 -0400359 if (entry)
360 ext3fs_dirhash(entry->name, entry->len, hinfo);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 hash = hinfo->hash;
362
363 if (root->info.unused_flags & 1) {
Harvey Harrisone05b6b52008-04-28 02:16:15 -0700364 ext3_warning(dir->i_sb, __func__,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365 "Unimplemented inode hash flags: %#06x",
366 root->info.unused_flags);
367 brelse(bh);
368 *err = ERR_BAD_DX_DIR;
369 goto fail;
370 }
371
372 if ((indirect = root->info.indirect_levels) > 1) {
Harvey Harrisone05b6b52008-04-28 02:16:15 -0700373 ext3_warning(dir->i_sb, __func__,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 "Unimplemented inode hash depth: %#06x",
375 root->info.indirect_levels);
376 brelse(bh);
377 *err = ERR_BAD_DX_DIR;
378 goto fail;
379 }
380
381 entries = (struct dx_entry *) (((char *)&root->info) +
382 root->info.info_length);
Eric Sandeen3d82aba2007-09-18 22:46:38 -0700383
384 if (dx_get_limit(entries) != dx_root_limit(dir,
385 root->info.info_length)) {
Harvey Harrisone05b6b52008-04-28 02:16:15 -0700386 ext3_warning(dir->i_sb, __func__,
Eric Sandeen3d82aba2007-09-18 22:46:38 -0700387 "dx entry: limit != root limit");
388 brelse(bh);
389 *err = ERR_BAD_DX_DIR;
390 goto fail;
391 }
392
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393 dxtrace (printk("Look up %x", hash));
394 while (1)
395 {
396 count = dx_get_count(entries);
Eric Sandeen3d82aba2007-09-18 22:46:38 -0700397 if (!count || count > dx_get_limit(entries)) {
Harvey Harrisone05b6b52008-04-28 02:16:15 -0700398 ext3_warning(dir->i_sb, __func__,
Eric Sandeen3d82aba2007-09-18 22:46:38 -0700399 "dx entry: no count or count > limit");
400 brelse(bh);
401 *err = ERR_BAD_DX_DIR;
402 goto fail2;
403 }
404
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 p = entries + 1;
406 q = entries + count - 1;
407 while (p <= q)
408 {
409 m = p + (q - p)/2;
410 dxtrace(printk("."));
411 if (dx_get_hash(m) > hash)
412 q = m - 1;
413 else
414 p = m + 1;
415 }
416
417 if (0) // linear search cross check
418 {
419 unsigned n = count - 1;
420 at = entries;
421 while (n--)
422 {
423 dxtrace(printk(","));
424 if (dx_get_hash(++at) > hash)
425 {
426 at--;
427 break;
428 }
429 }
430 assert (at == p - 1);
431 }
432
433 at = p - 1;
434 dxtrace(printk(" %x->%u\n", at == entries? 0: dx_get_hash(at), dx_get_block(at)));
435 frame->bh = bh;
436 frame->entries = entries;
437 frame->at = at;
438 if (!indirect--) return frame;
Carlos Maiolinoc3d59ad2012-10-02 23:59:23 -0300439 if (!(bh = ext3_dir_bread(NULL, dir, dx_get_block(at), 0, err))) {
440 *err = ERR_BAD_DX_DIR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 goto fail2;
Carlos Maiolinoc3d59ad2012-10-02 23:59:23 -0300442 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 at = entries = ((struct dx_node *) bh->b_data)->entries;
Eric Sandeen3d82aba2007-09-18 22:46:38 -0700444 if (dx_get_limit(entries) != dx_node_limit (dir)) {
Harvey Harrisone05b6b52008-04-28 02:16:15 -0700445 ext3_warning(dir->i_sb, __func__,
Eric Sandeen3d82aba2007-09-18 22:46:38 -0700446 "dx entry: limit != node limit");
447 brelse(bh);
448 *err = ERR_BAD_DX_DIR;
449 goto fail2;
450 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 frame++;
Eric Sandeen3d82aba2007-09-18 22:46:38 -0700452 frame->bh = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 }
454fail2:
455 while (frame >= frame_in) {
456 brelse(frame->bh);
457 frame--;
458 }
459fail:
Eric Sandeen3d82aba2007-09-18 22:46:38 -0700460 if (*err == ERR_BAD_DX_DIR)
Harvey Harrisone05b6b52008-04-28 02:16:15 -0700461 ext3_warning(dir->i_sb, __func__,
Eric Sandeen3d82aba2007-09-18 22:46:38 -0700462 "Corrupt dir inode %ld, running e2fsck is "
463 "recommended.", dir->i_ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 return NULL;
465}
466
467static void dx_release (struct dx_frame *frames)
468{
469 if (frames[0].bh == NULL)
470 return;
471
472 if (((struct dx_root *) frames[0].bh->b_data)->info.indirect_levels)
473 brelse(frames[1].bh);
474 brelse(frames[0].bh);
475}
476
477/*
478 * This function increments the frame pointer to search the next leaf
479 * block, and reads in the necessary intervening nodes if the search
480 * should be necessary. Whether or not the search is necessary is
481 * controlled by the hash parameter. If the hash value is even, then
482 * the search is only continued if the next block starts with that
483 * hash value. This is used if we are searching for a specific file.
484 *
485 * If the hash value is HASH_NB_ALWAYS, then always go to the next block.
486 *
487 * This function returns 1 if the caller should continue to search,
488 * or 0 if it should not. If there is an error reading one of the
489 * index blocks, it will a negative error code.
490 *
491 * If start_hash is non-null, it will be filled in with the starting
492 * hash of the next page.
493 */
494static int ext3_htree_next_block(struct inode *dir, __u32 hash,
495 struct dx_frame *frame,
Mingming Caoae6ddcc2006-09-27 01:49:27 -0700496 struct dx_frame *frames,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497 __u32 *start_hash)
498{
499 struct dx_frame *p;
500 struct buffer_head *bh;
501 int err, num_frames = 0;
502 __u32 bhash;
503
504 p = frame;
505 /*
506 * Find the next leaf page by incrementing the frame pointer.
507 * If we run out of entries in the interior node, loop around and
508 * increment pointer in the parent node. When we break out of
509 * this loop, num_frames indicates the number of interior
510 * nodes need to be read.
511 */
512 while (1) {
513 if (++(p->at) < p->entries + dx_get_count(p->entries))
514 break;
515 if (p == frames)
516 return 0;
517 num_frames++;
518 p--;
519 }
520
521 /*
522 * If the hash is 1, then continue only if the next page has a
523 * continuation hash of any value. This is used for readdir
524 * handling. Otherwise, check to see if the hash matches the
525 * desired contiuation hash. If it doesn't, return since
526 * there's no point to read in the successive index pages.
527 */
528 bhash = dx_get_hash(p->at);
529 if (start_hash)
530 *start_hash = bhash;
531 if ((hash & 1) == 0) {
532 if ((bhash & ~1) != hash)
533 return 0;
534 }
535 /*
536 * If the hash is HASH_NB_ALWAYS, we always go to the next
537 * block so no check is necessary
538 */
539 while (num_frames--) {
Carlos Maiolinoc3d59ad2012-10-02 23:59:23 -0300540 if (!(bh = ext3_dir_bread(NULL, dir, dx_get_block(p->at),
541 0, &err)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 return err; /* Failure */
543 p++;
544 brelse (p->bh);
545 p->bh = bh;
546 p->at = p->entries = ((struct dx_node *) bh->b_data)->entries;
547 }
548 return 1;
549}
550
551
552/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553 * This function fills a red-black tree with information from a
554 * directory block. It returns the number directory entries loaded
555 * into the tree. If there is an error it is returned in err.
556 */
557static int htree_dirblock_to_tree(struct file *dir_file,
558 struct inode *dir, int block,
559 struct dx_hash_info *hinfo,
560 __u32 start_hash, __u32 start_minor_hash)
561{
562 struct buffer_head *bh;
563 struct ext3_dir_entry_2 *de, *top;
Carlos Maiolinoaa966012012-10-01 16:50:54 -0300564 int err = 0, count = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565
566 dxtrace(printk("In htree dirblock_to_tree: block %d\n", block));
Carlos Maiolinoc3d59ad2012-10-02 23:59:23 -0300567
568 if (!(bh = ext3_dir_bread(NULL, dir, block, 0, &err)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569 return err;
570
571 de = (struct ext3_dir_entry_2 *) bh->b_data;
572 top = (struct ext3_dir_entry_2 *) ((char *) de +
573 dir->i_sb->s_blocksize -
574 EXT3_DIR_REC_LEN(0));
575 for (; de < top; de = ext3_next_entry(de)) {
Eric Sandeen40b85132006-12-06 20:36:26 -0800576 if (!ext3_check_dir_entry("htree_dirblock_to_tree", dir, de, bh,
577 (block<<EXT3_BLOCK_SIZE_BITS(dir->i_sb))
578 +((char *)de - bh->b_data))) {
Al Viro64cb9272013-07-01 08:12:38 -0400579 /* silently ignore the rest of the block */
580 break;
Eric Sandeen40b85132006-12-06 20:36:26 -0800581 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582 ext3fs_dirhash(de->name, de->name_len, hinfo);
583 if ((hinfo->hash < start_hash) ||
584 ((hinfo->hash == start_hash) &&
585 (hinfo->minor_hash < start_minor_hash)))
586 continue;
587 if (de->inode == 0)
588 continue;
589 if ((err = ext3_htree_store_dirent(dir_file,
590 hinfo->hash, hinfo->minor_hash, de)) != 0) {
591 brelse(bh);
592 return err;
593 }
594 count++;
595 }
596 brelse(bh);
597 return count;
598}
599
600
601/*
602 * This function fills a red-black tree with information from a
603 * directory. We start scanning the directory in hash order, starting
604 * at start_hash and start_minor_hash.
605 *
606 * This function returns the number of entries inserted into the tree,
607 * or a negative error code.
608 */
609int ext3_htree_fill_tree(struct file *dir_file, __u32 start_hash,
610 __u32 start_minor_hash, __u32 *next_hash)
611{
612 struct dx_hash_info hinfo;
613 struct ext3_dir_entry_2 *de;
614 struct dx_frame frames[2], *frame;
615 struct inode *dir;
616 int block, err;
617 int count = 0;
618 int ret;
619 __u32 hashval;
620
621 dxtrace(printk("In htree_fill_tree, start hash: %x:%x\n", start_hash,
622 start_minor_hash));
Al Viro496ad9a2013-01-23 17:07:38 -0500623 dir = file_inode(dir_file);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624 if (!(EXT3_I(dir)->i_flags & EXT3_INDEX_FL)) {
625 hinfo.hash_version = EXT3_SB(dir->i_sb)->s_def_hash_version;
Theodore Ts'o5e1f8c92008-10-28 13:21:55 -0400626 if (hinfo.hash_version <= DX_HASH_TEA)
627 hinfo.hash_version +=
628 EXT3_SB(dir->i_sb)->s_hash_unsigned;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629 hinfo.seed = EXT3_SB(dir->i_sb)->s_hash_seed;
630 count = htree_dirblock_to_tree(dir_file, dir, 0, &hinfo,
631 start_hash, start_minor_hash);
632 *next_hash = ~0;
633 return count;
634 }
635 hinfo.hash = start_hash;
636 hinfo.minor_hash = 0;
Al Viro496ad9a2013-01-23 17:07:38 -0500637 frame = dx_probe(NULL, file_inode(dir_file), &hinfo, frames, &err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638 if (!frame)
639 return err;
640
641 /* Add '.' and '..' from the htree header */
642 if (!start_hash && !start_minor_hash) {
643 de = (struct ext3_dir_entry_2 *) frames[0].bh->b_data;
644 if ((err = ext3_htree_store_dirent(dir_file, 0, 0, de)) != 0)
645 goto errout;
646 count++;
647 }
648 if (start_hash < 2 || (start_hash ==2 && start_minor_hash==0)) {
649 de = (struct ext3_dir_entry_2 *) frames[0].bh->b_data;
650 de = ext3_next_entry(de);
651 if ((err = ext3_htree_store_dirent(dir_file, 2, 0, de)) != 0)
652 goto errout;
653 count++;
654 }
655
656 while (1) {
657 block = dx_get_block(frame->at);
658 ret = htree_dirblock_to_tree(dir_file, dir, block, &hinfo,
659 start_hash, start_minor_hash);
660 if (ret < 0) {
661 err = ret;
662 goto errout;
663 }
664 count += ret;
665 hashval = ~0;
Mingming Caoae6ddcc2006-09-27 01:49:27 -0700666 ret = ext3_htree_next_block(dir, HASH_NB_ALWAYS,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667 frame, frames, &hashval);
668 *next_hash = hashval;
669 if (ret < 0) {
670 err = ret;
671 goto errout;
672 }
673 /*
674 * Stop if: (a) there are no more entries, or
675 * (b) we have inserted at least one entry and the
676 * next hash value is not a continuation
677 */
678 if ((ret == 0) ||
679 (count && ((hashval & 1) == 0)))
680 break;
681 }
682 dx_release(frames);
Mingming Caoae6ddcc2006-09-27 01:49:27 -0700683 dxtrace(printk("Fill tree: returned %d entries, next hash: %x\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684 count, *next_hash));
685 return count;
686errout:
687 dx_release(frames);
688 return (err);
689}
690
691
692/*
693 * Directory block splitting, compacting
694 */
695
Eric Sandeenef2b02d2007-09-18 22:46:42 -0700696/*
697 * Create map of hash values, offsets, and sizes, stored at end of block.
698 * Returns number of entries mapped.
699 */
Wei Yongjun45f90212009-04-02 16:57:14 -0700700static int dx_make_map(struct ext3_dir_entry_2 *de, unsigned blocksize,
701 struct dx_hash_info *hinfo, struct dx_map_entry *map_tail)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702{
703 int count = 0;
704 char *base = (char *) de;
705 struct dx_hash_info h = *hinfo;
706
Wei Yongjun45f90212009-04-02 16:57:14 -0700707 while ((char *) de < base + blocksize)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708 {
709 if (de->name_len && de->inode) {
710 ext3fs_dirhash(de->name, de->name_len, &h);
711 map_tail--;
712 map_tail->hash = h.hash;
Eric Sandeenef2b02d2007-09-18 22:46:42 -0700713 map_tail->offs = (u16) ((char *) de - base);
714 map_tail->size = le16_to_cpu(de->rec_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715 count++;
716 cond_resched();
717 }
718 /* XXX: do we need to check rec_len == 0 case? -Chris */
Jan Kara7c06a8d2007-11-14 17:00:19 -0800719 de = ext3_next_entry(de);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720 }
721 return count;
722}
723
Eric Sandeenef2b02d2007-09-18 22:46:42 -0700724/* Sort map by hash value */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725static void dx_sort_map (struct dx_map_entry *map, unsigned count)
726{
727 struct dx_map_entry *p, *q, *top = map + count - 1;
728 int more;
729 /* Combsort until bubble sort doesn't suck */
730 while (count > 2)
731 {
732 count = count*10/13;
733 if (count - 9 < 2) /* 9, 10 -> 11 */
734 count = 11;
735 for (p = top, q = p - count; q >= map; p--, q--)
736 if (p->hash < q->hash)
737 swap(*p, *q);
738 }
739 /* Garden variety bubble sort */
740 do {
741 more = 0;
742 q = top;
743 while (q-- > map)
744 {
745 if (q[1].hash >= q[0].hash)
746 continue;
747 swap(*(q+1), *q);
748 more = 1;
749 }
750 } while(more);
751}
752
753static void dx_insert_block(struct dx_frame *frame, u32 hash, u32 block)
754{
755 struct dx_entry *entries = frame->entries;
756 struct dx_entry *old = frame->at, *new = old + 1;
757 int count = dx_get_count(entries);
758
759 assert(count < dx_get_limit(entries));
760 assert(old < entries + count);
761 memmove(new + 1, new, (char *)(entries + count) - (char *)(new));
762 dx_set_hash(new, hash);
763 dx_set_block(new, block);
764 dx_set_count(entries, count + 1);
765}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766
767static void ext3_update_dx_flag(struct inode *inode)
768{
769 if (!EXT3_HAS_COMPAT_FEATURE(inode->i_sb,
770 EXT3_FEATURE_COMPAT_DIR_INDEX))
771 EXT3_I(inode)->i_flags &= ~EXT3_INDEX_FL;
772}
773
774/*
775 * NOTE! unlike strncmp, ext3_match returns 1 for success, 0 for failure.
776 *
777 * `len <= EXT3_NAME_LEN' is guaranteed by caller.
778 * `de != NULL' is guaranteed by caller.
779 */
780static inline int ext3_match (int len, const char * const name,
781 struct ext3_dir_entry_2 * de)
782{
783 if (len != de->name_len)
784 return 0;
785 if (!de->inode)
786 return 0;
787 return !memcmp(name, de->name, len);
788}
789
790/*
791 * Returns 0 if not found, -1 on failure, and 1 on success
792 */
793static inline int search_dirblock(struct buffer_head * bh,
794 struct inode *dir,
Al Viro734711a2008-08-24 07:26:48 -0400795 struct qstr *child,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796 unsigned long offset,
797 struct ext3_dir_entry_2 ** res_dir)
798{
799 struct ext3_dir_entry_2 * de;
800 char * dlimit;
801 int de_len;
Al Viro734711a2008-08-24 07:26:48 -0400802 const char *name = child->name;
803 int namelen = child->len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804
805 de = (struct ext3_dir_entry_2 *) bh->b_data;
806 dlimit = bh->b_data + dir->i_sb->s_blocksize;
807 while ((char *) de < dlimit) {
808 /* this code is executed quadratically often */
809 /* do minimal checking `by hand' */
810
811 if ((char *) de + namelen <= dlimit &&
812 ext3_match (namelen, name, de)) {
813 /* found a match - just to be sure, do a full check */
814 if (!ext3_check_dir_entry("ext3_find_entry",
815 dir, de, bh, offset))
816 return -1;
817 *res_dir = de;
818 return 1;
819 }
820 /* prevent looping on a bad block */
Jan Kara7c06a8d2007-11-14 17:00:19 -0800821 de_len = ext3_rec_len_from_disk(de->rec_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822 if (de_len <= 0)
823 return -1;
824 offset += de_len;
825 de = (struct ext3_dir_entry_2 *) ((char *) de + de_len);
826 }
827 return 0;
828}
829
830
831/*
832 * ext3_find_entry()
833 *
834 * finds an entry in the specified directory with the wanted name. It
835 * returns the cache buffer in which the entry was found, and the entry
836 * itself (as a parameter - res_dir). It does NOT read the inode of the
837 * entry - you'll have to do that yourself if you want to.
838 *
839 * The returned buffer_head has ->b_count elevated. The caller is expected
840 * to brelse() it when appropriate.
841 */
Al Viro734711a2008-08-24 07:26:48 -0400842static struct buffer_head *ext3_find_entry(struct inode *dir,
843 struct qstr *entry,
844 struct ext3_dir_entry_2 **res_dir)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700845{
846 struct super_block * sb;
847 struct buffer_head * bh_use[NAMEI_RA_SIZE];
848 struct buffer_head * bh, *ret = NULL;
849 unsigned long start, block, b;
Theodore Ts'of0cad892010-10-16 19:36:59 -0400850 const u8 *name = entry->name;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851 int ra_max = 0; /* Number of bh's in the readahead
852 buffer, bh_use[] */
853 int ra_ptr = 0; /* Current index into readahead
854 buffer */
855 int num = 0;
856 int nblocks, i, err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857 int namelen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858
859 *res_dir = NULL;
860 sb = dir->i_sb;
Al Viro734711a2008-08-24 07:26:48 -0400861 namelen = entry->len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862 if (namelen > EXT3_NAME_LEN)
863 return NULL;
Theodore Ts'of0cad892010-10-16 19:36:59 -0400864 if ((namelen <= 2) && (name[0] == '.') &&
865 (name[1] == '.' || name[1] == 0)) {
866 /*
867 * "." or ".." will only be in the first block
868 * NFS may look up ".."; "." should be handled by the VFS
869 */
870 block = start = 0;
871 nblocks = 1;
872 goto restart;
873 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874 if (is_dx(dir)) {
Al Viro734711a2008-08-24 07:26:48 -0400875 bh = ext3_dx_find_entry(dir, entry, res_dir, &err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876 /*
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;
Zheng Liud03e1292011-12-05 15:55:11 +0800912 if (bh && !bh_uptodate_or_lock(bh)) {
913 get_bh(bh);
914 bh->b_end_io = end_buffer_read_sync;
915 submit_bh(READ | REQ_META | REQ_PRIO,
916 bh);
917 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918 }
919 }
920 if ((bh = bh_use[ra_ptr++]) == NULL)
921 goto next;
922 wait_on_buffer(bh);
923 if (!buffer_uptodate(bh)) {
924 /* read error, skip block & hope for the best */
Harvey Harrisone05b6b52008-04-28 02:16:15 -0700925 ext3_error(sb, __func__, "reading directory #%lu "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926 "offset %lu", dir->i_ino, block);
927 brelse(bh);
928 goto next;
929 }
Al Viro734711a2008-08-24 07:26:48 -0400930 i = search_dirblock(bh, dir, entry,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931 block << EXT3_BLOCK_SIZE_BITS(sb), res_dir);
932 if (i == 1) {
933 EXT3_I(dir)->i_dir_start_lookup = block;
934 ret = bh;
935 goto cleanup_and_exit;
936 } else {
937 brelse(bh);
938 if (i < 0)
939 goto cleanup_and_exit;
940 }
941 next:
942 if (++block >= nblocks)
943 block = 0;
944 } while (block != start);
945
946 /*
947 * If the directory has grown while we were searching, then
948 * search the last part of the directory before giving up.
949 */
950 block = nblocks;
951 nblocks = dir->i_size >> EXT3_BLOCK_SIZE_BITS(sb);
952 if (block < nblocks) {
953 start = 0;
954 goto restart;
955 }
956
957cleanup_and_exit:
958 /* Clean up the read-ahead blocks */
959 for (; ra_ptr < ra_max; ra_ptr++)
960 brelse (bh_use[ra_ptr]);
961 return ret;
962}
963
Al Viro734711a2008-08-24 07:26:48 -0400964static struct buffer_head * ext3_dx_find_entry(struct inode *dir,
965 struct qstr *entry, struct ext3_dir_entry_2 **res_dir,
966 int *err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967{
Theodore Ts'of0cad892010-10-16 19:36:59 -0400968 struct super_block *sb = dir->i_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969 struct dx_hash_info hinfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700970 struct dx_frame frames[2], *frame;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971 struct buffer_head *bh;
972 unsigned long block;
973 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974
Theodore Ts'of0cad892010-10-16 19:36:59 -0400975 if (!(frame = dx_probe(entry, dir, &hinfo, frames, err)))
976 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700977 do {
978 block = dx_get_block(frame->at);
Carlos Maiolinoc3d59ad2012-10-02 23:59:23 -0300979 if (!(bh = ext3_dir_bread (NULL, dir, block, 0, err)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980 goto errout;
Duane Griffin275c0a82008-07-25 01:46:31 -0700981
Theodore Ts'o5026e902010-10-16 19:37:00 -0400982 retval = search_dirblock(bh, dir, entry,
983 block << EXT3_BLOCK_SIZE_BITS(sb),
984 res_dir);
985 if (retval == 1) {
986 dx_release(frames);
987 return bh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988 }
Theodore Ts'o5026e902010-10-16 19:37:00 -0400989 brelse(bh);
990 if (retval == -1) {
991 *err = ERR_BAD_DX_DIR;
992 goto errout;
993 }
994
Linus Torvalds1da177e2005-04-16 15:20:36 -0700995 /* Check to see if we should continue to search */
Theodore Ts'of0cad892010-10-16 19:36:59 -0400996 retval = ext3_htree_next_block(dir, hinfo.hash, frame,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700997 frames, NULL);
998 if (retval < 0) {
Harvey Harrisone05b6b52008-04-28 02:16:15 -0700999 ext3_warning(sb, __func__,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001000 "error reading index page in directory #%lu",
1001 dir->i_ino);
1002 *err = retval;
1003 goto errout;
1004 }
1005 } while (retval == 1);
1006
1007 *err = -ENOENT;
1008errout:
Bernd Schubertc878c732011-07-20 23:16:33 +02001009 dxtrace(printk("%s not found\n", entry->name));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001010 dx_release (frames);
1011 return NULL;
1012}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013
Al Viro00cd8dd2012-06-10 17:13:09 -04001014static struct dentry *ext3_lookup(struct inode * dir, struct dentry *dentry, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015{
1016 struct inode * inode;
1017 struct ext3_dir_entry_2 * de;
1018 struct buffer_head * bh;
1019
1020 if (dentry->d_name.len > EXT3_NAME_LEN)
1021 return ERR_PTR(-ENAMETOOLONG);
1022
Al Viro734711a2008-08-24 07:26:48 -04001023 bh = ext3_find_entry(dir, &dentry->d_name, &de);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024 inode = NULL;
1025 if (bh) {
1026 unsigned long ino = le32_to_cpu(de->inode);
1027 brelse (bh);
Neil Brown2ccb48e2006-07-30 03:03:01 -07001028 if (!ext3_valid_inum(dir->i_sb, ino)) {
1029 ext3_error(dir->i_sb, "ext3_lookup",
1030 "bad inode number: %lu", ino);
David Howells473043d2008-02-07 00:15:36 -08001031 return ERR_PTR(-EIO);
Vasily Averina6c15c22007-07-15 23:40:46 -07001032 }
David Howells473043d2008-02-07 00:15:36 -08001033 inode = ext3_iget(dir->i_sb, ino);
Al Viroa9049372011-07-08 21:20:11 -04001034 if (inode == ERR_PTR(-ESTALE)) {
1035 ext3_error(dir->i_sb, __func__,
1036 "deleted inode referenced: %lu",
1037 ino);
1038 return ERR_PTR(-EIO);
Bryan Donlande18f3b2009-04-02 16:57:15 -07001039 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001040 }
Pekka Enbergba7fe362006-01-14 13:21:08 -08001041 return d_splice_alias(inode, dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042}
1043
1044
1045struct dentry *ext3_get_parent(struct dentry *child)
1046{
1047 unsigned long ino;
Linus Torvalds26fe5752012-05-10 13:14:12 -07001048 struct qstr dotdot = QSTR_INIT("..", 2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001049 struct ext3_dir_entry_2 * de;
1050 struct buffer_head *bh;
1051
Al Viro734711a2008-08-24 07:26:48 -04001052 bh = ext3_find_entry(child->d_inode, &dotdot, &de);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053 if (!bh)
1054 return ERR_PTR(-ENOENT);
1055 ino = le32_to_cpu(de->inode);
1056 brelse(bh);
Neil Brown2ccb48e2006-07-30 03:03:01 -07001057
1058 if (!ext3_valid_inum(child->d_inode->i_sb, ino)) {
1059 ext3_error(child->d_inode->i_sb, "ext3_get_parent",
1060 "bad inode number: %lu", ino);
David Howells473043d2008-02-07 00:15:36 -08001061 return ERR_PTR(-EIO);
Vasily Averina6c15c22007-07-15 23:40:46 -07001062 }
1063
Christoph Hellwig44003722008-08-11 15:49:04 +02001064 return d_obtain_alias(ext3_iget(child->d_inode->i_sb, ino));
Mingming Caoae6ddcc2006-09-27 01:49:27 -07001065}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066
1067#define S_SHIFT 12
1068static unsigned char ext3_type_by_mode[S_IFMT >> S_SHIFT] = {
1069 [S_IFREG >> S_SHIFT] = EXT3_FT_REG_FILE,
1070 [S_IFDIR >> S_SHIFT] = EXT3_FT_DIR,
1071 [S_IFCHR >> S_SHIFT] = EXT3_FT_CHRDEV,
1072 [S_IFBLK >> S_SHIFT] = EXT3_FT_BLKDEV,
1073 [S_IFIFO >> S_SHIFT] = EXT3_FT_FIFO,
1074 [S_IFSOCK >> S_SHIFT] = EXT3_FT_SOCK,
1075 [S_IFLNK >> S_SHIFT] = EXT3_FT_SYMLINK,
1076};
1077
1078static inline void ext3_set_de_type(struct super_block *sb,
1079 struct ext3_dir_entry_2 *de,
1080 umode_t mode) {
1081 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_FILETYPE))
1082 de->file_type = ext3_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
1083}
1084
Eric Sandeenef2b02d2007-09-18 22:46:42 -07001085/*
1086 * Move count entries from end of map between two memory locations.
1087 * Returns pointer to last entry moved.
1088 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001089static struct ext3_dir_entry_2 *
1090dx_move_dirents(char *from, char *to, struct dx_map_entry *map, int count)
1091{
1092 unsigned rec_len = 0;
1093
1094 while (count--) {
1095 struct ext3_dir_entry_2 *de = (struct ext3_dir_entry_2 *) (from + map->offs);
1096 rec_len = EXT3_DIR_REC_LEN(de->name_len);
1097 memcpy (to, de, rec_len);
1098 ((struct ext3_dir_entry_2 *) to)->rec_len =
Jan Kara7c06a8d2007-11-14 17:00:19 -08001099 ext3_rec_len_to_disk(rec_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001100 de->inode = 0;
1101 map++;
1102 to += rec_len;
1103 }
1104 return (struct ext3_dir_entry_2 *) (to - rec_len);
1105}
1106
Eric Sandeenef2b02d2007-09-18 22:46:42 -07001107/*
1108 * Compact each dir entry in the range to the minimal rec_len.
1109 * Returns pointer to last entry in range.
1110 */
Wei Yongjun45f90212009-04-02 16:57:14 -07001111static struct ext3_dir_entry_2 *dx_pack_dirents(char *base, unsigned blocksize)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001112{
Wei Yongjun45f90212009-04-02 16:57:14 -07001113 struct ext3_dir_entry_2 *next, *to, *prev;
1114 struct ext3_dir_entry_2 *de = (struct ext3_dir_entry_2 *)base;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001115 unsigned rec_len = 0;
1116
1117 prev = to = de;
Wei Yongjun45f90212009-04-02 16:57:14 -07001118 while ((char *)de < base + blocksize) {
Jan Kara7c06a8d2007-11-14 17:00:19 -08001119 next = ext3_next_entry(de);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001120 if (de->inode && de->name_len) {
1121 rec_len = EXT3_DIR_REC_LEN(de->name_len);
1122 if (de > to)
1123 memmove(to, de, rec_len);
Jan Kara7c06a8d2007-11-14 17:00:19 -08001124 to->rec_len = ext3_rec_len_to_disk(rec_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001125 prev = to;
1126 to = (struct ext3_dir_entry_2 *) (((char *) to) + rec_len);
1127 }
1128 de = next;
1129 }
1130 return prev;
1131}
1132
Eric Sandeenef2b02d2007-09-18 22:46:42 -07001133/*
1134 * Split a full leaf block to make room for a new dir entry.
1135 * Allocate a new block, and move entries so that they are approx. equally full.
1136 * Returns pointer to de in block into which the new entry will be inserted.
1137 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001138static struct ext3_dir_entry_2 *do_split(handle_t *handle, struct inode *dir,
1139 struct buffer_head **bh,struct dx_frame *frame,
1140 struct dx_hash_info *hinfo, int *error)
1141{
1142 unsigned blocksize = dir->i_sb->s_blocksize;
1143 unsigned count, continued;
1144 struct buffer_head *bh2;
1145 u32 newblock;
1146 u32 hash2;
1147 struct dx_map_entry *map;
1148 char *data1 = (*bh)->b_data, *data2;
Theodore Ts'o59e315b2008-12-06 16:58:39 -05001149 unsigned split, move, size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001150 struct ext3_dir_entry_2 *de = NULL, *de2;
Theodore Ts'o59e315b2008-12-06 16:58:39 -05001151 int err = 0, i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001152
Dmitriy Monakhovfedee542007-05-08 00:25:34 -07001153 bh2 = ext3_append (handle, dir, &newblock, &err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001154 if (!(bh2)) {
1155 brelse(*bh);
1156 *bh = NULL;
1157 goto errout;
1158 }
1159
1160 BUFFER_TRACE(*bh, "get_write_access");
1161 err = ext3_journal_get_write_access(handle, *bh);
Dmitriy Monakhovfedee542007-05-08 00:25:34 -07001162 if (err)
1163 goto journal_error;
1164
Linus Torvalds1da177e2005-04-16 15:20:36 -07001165 BUFFER_TRACE(frame->bh, "get_write_access");
1166 err = ext3_journal_get_write_access(handle, frame->bh);
1167 if (err)
1168 goto journal_error;
1169
1170 data2 = bh2->b_data;
1171
1172 /* create map in the end of data2 block */
1173 map = (struct dx_map_entry *) (data2 + blocksize);
1174 count = dx_make_map ((struct ext3_dir_entry_2 *) data1,
1175 blocksize, hinfo, map);
1176 map -= count;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001177 dx_sort_map (map, count);
Eric Sandeenef2b02d2007-09-18 22:46:42 -07001178 /* Split the existing block in the middle, size-wise */
1179 size = 0;
1180 move = 0;
1181 for (i = count-1; i >= 0; i--) {
1182 /* is more than half of this entry in 2nd half of the block? */
1183 if (size + map[i].size/2 > blocksize/2)
1184 break;
1185 size += map[i].size;
1186 move++;
1187 }
1188 /* map index at which we will split */
1189 split = count - move;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001190 hash2 = map[split].hash;
1191 continued = hash2 == map[split - 1].hash;
1192 dxtrace(printk("Split block %i at %x, %i/%i\n",
1193 dx_get_block(frame->at), hash2, split, count-split));
1194
1195 /* Fancy dance to stay within two buffers */
1196 de2 = dx_move_dirents(data1, data2, map + split, count - split);
1197 de = dx_pack_dirents(data1,blocksize);
Jan Kara7c06a8d2007-11-14 17:00:19 -08001198 de->rec_len = ext3_rec_len_to_disk(data1 + blocksize - (char *) de);
1199 de2->rec_len = ext3_rec_len_to_disk(data2 + blocksize - (char *) de2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001200 dxtrace(dx_show_leaf (hinfo, (struct ext3_dir_entry_2 *) data1, blocksize, 1));
1201 dxtrace(dx_show_leaf (hinfo, (struct ext3_dir_entry_2 *) data2, blocksize, 1));
1202
1203 /* Which block gets the new entry? */
1204 if (hinfo->hash >= hash2)
1205 {
1206 swap(*bh, bh2);
1207 de = de2;
1208 }
1209 dx_insert_block (frame, hash2 + continued, newblock);
1210 err = ext3_journal_dirty_metadata (handle, bh2);
1211 if (err)
1212 goto journal_error;
1213 err = ext3_journal_dirty_metadata (handle, frame->bh);
1214 if (err)
1215 goto journal_error;
1216 brelse (bh2);
1217 dxtrace(dx_show_index ("frame", frame->entries));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001218 return de;
Dmitriy Monakhovfedee542007-05-08 00:25:34 -07001219
1220journal_error:
1221 brelse(*bh);
1222 brelse(bh2);
1223 *bh = NULL;
1224 ext3_std_error(dir->i_sb, err);
1225errout:
1226 *error = err;
1227 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001228}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001229
1230
1231/*
1232 * Add a new entry into a directory (leaf) block. If de is non-NULL,
1233 * it points to a directory entry which is guaranteed to be large
1234 * enough for new directory entry. If de is NULL, then
1235 * add_dirent_to_buf will attempt search the directory block for
1236 * space. It will return -ENOSPC if no space is available, and -EIO
1237 * and -EEXIST if directory entry already exists.
Mingming Caoae6ddcc2006-09-27 01:49:27 -07001238 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001239 * NOTE! bh is NOT released in the case where ENOSPC is returned. In
1240 * all other cases bh is released.
1241 */
1242static int add_dirent_to_buf(handle_t *handle, struct dentry *dentry,
1243 struct inode *inode, struct ext3_dir_entry_2 *de,
1244 struct buffer_head * bh)
1245{
1246 struct inode *dir = dentry->d_parent->d_inode;
1247 const char *name = dentry->d_name.name;
1248 int namelen = dentry->d_name.len;
1249 unsigned long offset = 0;
1250 unsigned short reclen;
1251 int nlen, rlen, err;
1252 char *top;
1253
1254 reclen = EXT3_DIR_REC_LEN(namelen);
1255 if (!de) {
1256 de = (struct ext3_dir_entry_2 *)bh->b_data;
1257 top = bh->b_data + dir->i_sb->s_blocksize - reclen;
1258 while ((char *) de <= top) {
1259 if (!ext3_check_dir_entry("ext3_add_entry", dir, de,
1260 bh, offset)) {
1261 brelse (bh);
1262 return -EIO;
1263 }
1264 if (ext3_match (namelen, name, de)) {
1265 brelse (bh);
1266 return -EEXIST;
1267 }
1268 nlen = EXT3_DIR_REC_LEN(de->name_len);
Jan Kara7c06a8d2007-11-14 17:00:19 -08001269 rlen = ext3_rec_len_from_disk(de->rec_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001270 if ((de->inode? rlen - nlen: rlen) >= reclen)
1271 break;
1272 de = (struct ext3_dir_entry_2 *)((char *)de + rlen);
1273 offset += rlen;
1274 }
1275 if ((char *) de > top)
1276 return -ENOSPC;
1277 }
1278 BUFFER_TRACE(bh, "get_write_access");
1279 err = ext3_journal_get_write_access(handle, bh);
1280 if (err) {
1281 ext3_std_error(dir->i_sb, err);
1282 brelse(bh);
1283 return err;
1284 }
1285
1286 /* By now the buffer is marked for journaling */
1287 nlen = EXT3_DIR_REC_LEN(de->name_len);
Jan Kara7c06a8d2007-11-14 17:00:19 -08001288 rlen = ext3_rec_len_from_disk(de->rec_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001289 if (de->inode) {
1290 struct ext3_dir_entry_2 *de1 = (struct ext3_dir_entry_2 *)((char *)de + nlen);
Jan Kara7c06a8d2007-11-14 17:00:19 -08001291 de1->rec_len = ext3_rec_len_to_disk(rlen - nlen);
1292 de->rec_len = ext3_rec_len_to_disk(nlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001293 de = de1;
1294 }
1295 de->file_type = EXT3_FT_UNKNOWN;
1296 if (inode) {
1297 de->inode = cpu_to_le32(inode->i_ino);
1298 ext3_set_de_type(dir->i_sb, de, inode->i_mode);
1299 } else
1300 de->inode = 0;
1301 de->name_len = namelen;
1302 memcpy (de->name, name, namelen);
1303 /*
1304 * XXX shouldn't update any times until successful
1305 * completion of syscall, but too many callers depend
1306 * on this.
1307 *
1308 * XXX similarly, too many callers depend on
1309 * ext3_new_inode() setting the times, but error
1310 * recovery deletes the inode, so the worst that can
1311 * happen is that the times are slightly out of date
1312 * and/or different from the directory change time.
1313 */
1314 dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
1315 ext3_update_dx_flag(dir);
1316 dir->i_version++;
1317 ext3_mark_inode_dirty(handle, dir);
1318 BUFFER_TRACE(bh, "call ext3_journal_dirty_metadata");
1319 err = ext3_journal_dirty_metadata(handle, bh);
1320 if (err)
1321 ext3_std_error(dir->i_sb, err);
1322 brelse(bh);
1323 return 0;
1324}
1325
Linus Torvalds1da177e2005-04-16 15:20:36 -07001326/*
1327 * This converts a one block unindexed directory to a 3 block indexed
1328 * directory, and adds the dentry to the indexed directory.
1329 */
1330static int make_indexed_dir(handle_t *handle, struct dentry *dentry,
1331 struct inode *inode, struct buffer_head *bh)
1332{
1333 struct inode *dir = dentry->d_parent->d_inode;
1334 const char *name = dentry->d_name.name;
1335 int namelen = dentry->d_name.len;
1336 struct buffer_head *bh2;
1337 struct dx_root *root;
1338 struct dx_frame frames[2], *frame;
1339 struct dx_entry *entries;
1340 struct ext3_dir_entry_2 *de, *de2;
1341 char *data1, *top;
1342 unsigned len;
1343 int retval;
1344 unsigned blocksize;
1345 struct dx_hash_info hinfo;
1346 u32 block;
1347 struct fake_dirent *fde;
1348
1349 blocksize = dir->i_sb->s_blocksize;
Theodore Ts'oa21102b2009-01-16 11:13:47 -05001350 dxtrace(printk(KERN_DEBUG "Creating index: inode %lu\n", dir->i_ino));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001351 retval = ext3_journal_get_write_access(handle, bh);
1352 if (retval) {
1353 ext3_std_error(dir->i_sb, retval);
1354 brelse(bh);
1355 return retval;
1356 }
1357 root = (struct dx_root *) bh->b_data;
1358
Theodore Ts'oa21102b2009-01-16 11:13:47 -05001359 /* The 0th block becomes the root, move the dirents out */
1360 fde = &root->dotdot;
1361 de = (struct ext3_dir_entry_2 *)((char *)fde +
1362 ext3_rec_len_from_disk(fde->rec_len));
1363 if ((char *) de >= (((char *) root) + blocksize)) {
1364 ext3_error(dir->i_sb, __func__,
1365 "invalid rec_len for '..' in inode %lu",
1366 dir->i_ino);
1367 brelse(bh);
1368 return -EIO;
1369 }
1370 len = ((char *) root) + blocksize - (char *) de;
1371
Linus Torvalds1da177e2005-04-16 15:20:36 -07001372 bh2 = ext3_append (handle, dir, &block, &retval);
1373 if (!(bh2)) {
1374 brelse(bh);
1375 return retval;
1376 }
1377 EXT3_I(dir)->i_flags |= EXT3_INDEX_FL;
1378 data1 = bh2->b_data;
1379
Linus Torvalds1da177e2005-04-16 15:20:36 -07001380 memcpy (data1, de, len);
1381 de = (struct ext3_dir_entry_2 *) data1;
1382 top = data1 + len;
Jan Kara7c06a8d2007-11-14 17:00:19 -08001383 while ((char *)(de2 = ext3_next_entry(de)) < top)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001384 de = de2;
Jan Kara7c06a8d2007-11-14 17:00:19 -08001385 de->rec_len = ext3_rec_len_to_disk(data1 + blocksize - (char *) de);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001386 /* Initialize the root; the dot dirents already exist */
1387 de = (struct ext3_dir_entry_2 *) (&root->dotdot);
Jan Kara7c06a8d2007-11-14 17:00:19 -08001388 de->rec_len = ext3_rec_len_to_disk(blocksize - EXT3_DIR_REC_LEN(2));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001389 memset (&root->info, 0, sizeof(root->info));
1390 root->info.info_length = sizeof(root->info);
1391 root->info.hash_version = EXT3_SB(dir->i_sb)->s_def_hash_version;
1392 entries = root->entries;
1393 dx_set_block (entries, 1);
1394 dx_set_count (entries, 1);
1395 dx_set_limit (entries, dx_root_limit(dir, sizeof(root->info)));
1396
1397 /* Initialize as for dx_probe */
1398 hinfo.hash_version = root->info.hash_version;
Theodore Ts'o5e1f8c92008-10-28 13:21:55 -04001399 if (hinfo.hash_version <= DX_HASH_TEA)
1400 hinfo.hash_version += EXT3_SB(dir->i_sb)->s_hash_unsigned;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001401 hinfo.seed = EXT3_SB(dir->i_sb)->s_hash_seed;
1402 ext3fs_dirhash(name, namelen, &hinfo);
1403 frame = frames;
1404 frame->entries = entries;
1405 frame->at = entries;
1406 frame->bh = bh;
1407 bh = bh2;
Jan Kara86c4f6d82011-04-27 18:20:44 +02001408 /*
1409 * Mark buffers dirty here so that if do_split() fails we write a
1410 * consistent set of buffers to disk.
1411 */
1412 ext3_journal_dirty_metadata(handle, frame->bh);
1413 ext3_journal_dirty_metadata(handle, bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001414 de = do_split(handle,dir, &bh, frame, &hinfo, &retval);
Jan Kara86c4f6d82011-04-27 18:20:44 +02001415 if (!de) {
1416 ext3_mark_inode_dirty(handle, dir);
1417 dx_release(frames);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001418 return retval;
Jan Kara86c4f6d82011-04-27 18:20:44 +02001419 }
1420 dx_release(frames);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001421
1422 return add_dirent_to_buf(handle, dentry, inode, de, bh);
1423}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001424
1425/*
1426 * ext3_add_entry()
1427 *
1428 * adds a file entry to the specified directory, using the same
1429 * semantics as ext3_find_entry(). It returns NULL if it failed.
1430 *
1431 * NOTE!! The inode part of 'de' is left at 0 - which means you
1432 * may not sleep between calling this and putting something into
1433 * the entry, as someone else might have used it while you slept.
1434 */
1435static int ext3_add_entry (handle_t *handle, struct dentry *dentry,
1436 struct inode *inode)
1437{
1438 struct inode *dir = dentry->d_parent->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001439 struct buffer_head * bh;
1440 struct ext3_dir_entry_2 *de;
1441 struct super_block * sb;
1442 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001443 int dx_fallback=0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001444 unsigned blocksize;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001445 u32 block, blocks;
1446
1447 sb = dir->i_sb;
1448 blocksize = sb->s_blocksize;
1449 if (!dentry->d_name.len)
1450 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001451 if (is_dx(dir)) {
1452 retval = ext3_dx_add_entry(handle, dentry, inode);
1453 if (!retval || (retval != ERR_BAD_DX_DIR))
1454 return retval;
1455 EXT3_I(dir)->i_flags &= ~EXT3_INDEX_FL;
1456 dx_fallback++;
1457 ext3_mark_inode_dirty(handle, dir);
1458 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001459 blocks = dir->i_size >> sb->s_blocksize_bits;
Andi Kleen0411ba72010-06-10 13:10:53 +02001460 for (block = 0; block < blocks; block++) {
Carlos Maiolinoc3d59ad2012-10-02 23:59:23 -03001461 if (!(bh = ext3_dir_bread(handle, dir, block, 0, &retval)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001462 return retval;
Carlos Maiolinoc3d59ad2012-10-02 23:59:23 -03001463
Linus Torvalds1da177e2005-04-16 15:20:36 -07001464 retval = add_dirent_to_buf(handle, dentry, inode, NULL, bh);
1465 if (retval != -ENOSPC)
1466 return retval;
1467
Linus Torvalds1da177e2005-04-16 15:20:36 -07001468 if (blocks == 1 && !dx_fallback &&
1469 EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_DIR_INDEX))
1470 return make_indexed_dir(handle, dentry, inode, bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001471 brelse(bh);
1472 }
1473 bh = ext3_append(handle, dir, &block, &retval);
1474 if (!bh)
1475 return retval;
1476 de = (struct ext3_dir_entry_2 *) bh->b_data;
1477 de->inode = 0;
Jan Kara7c06a8d2007-11-14 17:00:19 -08001478 de->rec_len = ext3_rec_len_to_disk(blocksize);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001479 return add_dirent_to_buf(handle, dentry, inode, de, bh);
1480}
1481
Linus Torvalds1da177e2005-04-16 15:20:36 -07001482/*
1483 * Returns 0 for success, or a negative error value
1484 */
1485static int ext3_dx_add_entry(handle_t *handle, struct dentry *dentry,
1486 struct inode *inode)
1487{
1488 struct dx_frame frames[2], *frame;
1489 struct dx_entry *entries, *at;
1490 struct dx_hash_info hinfo;
1491 struct buffer_head * bh;
1492 struct inode *dir = dentry->d_parent->d_inode;
1493 struct super_block * sb = dir->i_sb;
1494 struct ext3_dir_entry_2 *de;
1495 int err;
1496
Al Viro734711a2008-08-24 07:26:48 -04001497 frame = dx_probe(&dentry->d_name, dir, &hinfo, frames, &err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001498 if (!frame)
1499 return err;
1500 entries = frame->entries;
1501 at = frame->at;
1502
Carlos Maiolinoc3d59ad2012-10-02 23:59:23 -03001503 if (!(bh = ext3_dir_bread(handle, dir, dx_get_block(frame->at), 0, &err)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001504 goto cleanup;
1505
1506 BUFFER_TRACE(bh, "get_write_access");
1507 err = ext3_journal_get_write_access(handle, bh);
1508 if (err)
1509 goto journal_error;
1510
1511 err = add_dirent_to_buf(handle, dentry, inode, NULL, bh);
1512 if (err != -ENOSPC) {
1513 bh = NULL;
1514 goto cleanup;
1515 }
1516
1517 /* Block full, should compress but for now just split */
1518 dxtrace(printk("using %u of %u node entries\n",
1519 dx_get_count(entries), dx_get_limit(entries)));
1520 /* Need to split index? */
1521 if (dx_get_count(entries) == dx_get_limit(entries)) {
1522 u32 newblock;
1523 unsigned icount = dx_get_count(entries);
1524 int levels = frame - frames;
1525 struct dx_entry *entries2;
1526 struct dx_node *node2;
1527 struct buffer_head *bh2;
1528
1529 if (levels && (dx_get_count(frames->entries) ==
1530 dx_get_limit(frames->entries))) {
Harvey Harrisone05b6b52008-04-28 02:16:15 -07001531 ext3_warning(sb, __func__,
Glauber de Oliveira Costa9f406682006-01-08 01:03:22 -08001532 "Directory index full!");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001533 err = -ENOSPC;
1534 goto cleanup;
1535 }
1536 bh2 = ext3_append (handle, dir, &newblock, &err);
1537 if (!(bh2))
1538 goto cleanup;
1539 node2 = (struct dx_node *)(bh2->b_data);
1540 entries2 = node2->entries;
Eric Sandeend7433142011-03-04 16:04:08 -06001541 memset(&node2->fake, 0, sizeof(struct fake_dirent));
Jan Kara7c06a8d2007-11-14 17:00:19 -08001542 node2->fake.rec_len = ext3_rec_len_to_disk(sb->s_blocksize);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001543 BUFFER_TRACE(frame->bh, "get_write_access");
1544 err = ext3_journal_get_write_access(handle, frame->bh);
1545 if (err)
1546 goto journal_error;
1547 if (levels) {
1548 unsigned icount1 = icount/2, icount2 = icount - icount1;
1549 unsigned hash2 = dx_get_hash(entries + icount1);
1550 dxtrace(printk("Split index %i/%i\n", icount1, icount2));
1551
1552 BUFFER_TRACE(frame->bh, "get_write_access"); /* index root */
1553 err = ext3_journal_get_write_access(handle,
1554 frames[0].bh);
1555 if (err)
1556 goto journal_error;
1557
1558 memcpy ((char *) entries2, (char *) (entries + icount1),
1559 icount2 * sizeof(struct dx_entry));
1560 dx_set_count (entries, icount1);
1561 dx_set_count (entries2, icount2);
1562 dx_set_limit (entries2, dx_node_limit(dir));
1563
1564 /* Which index block gets the new entry? */
1565 if (at - entries >= icount1) {
1566 frame->at = at = at - entries - icount1 + entries2;
1567 frame->entries = entries = entries2;
1568 swap(frame->bh, bh2);
1569 }
1570 dx_insert_block (frames + 0, hash2, newblock);
1571 dxtrace(dx_show_index ("node", frames[1].entries));
1572 dxtrace(dx_show_index ("node",
1573 ((struct dx_node *) bh2->b_data)->entries));
1574 err = ext3_journal_dirty_metadata(handle, bh2);
1575 if (err)
1576 goto journal_error;
1577 brelse (bh2);
1578 } else {
1579 dxtrace(printk("Creating second level index...\n"));
1580 memcpy((char *) entries2, (char *) entries,
1581 icount * sizeof(struct dx_entry));
1582 dx_set_limit(entries2, dx_node_limit(dir));
1583
1584 /* Set up root */
1585 dx_set_count(entries, 1);
1586 dx_set_block(entries + 0, newblock);
1587 ((struct dx_root *) frames[0].bh->b_data)->info.indirect_levels = 1;
1588
1589 /* Add new access path frame */
1590 frame = frames + 1;
1591 frame->at = at = at - entries + entries2;
1592 frame->entries = entries = entries2;
1593 frame->bh = bh2;
1594 err = ext3_journal_get_write_access(handle,
1595 frame->bh);
1596 if (err)
1597 goto journal_error;
1598 }
Namhyung Kim156e7432010-11-25 01:53:13 +09001599 err = ext3_journal_dirty_metadata(handle, frames[0].bh);
1600 if (err)
1601 goto journal_error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001602 }
1603 de = do_split(handle, dir, &bh, frame, &hinfo, &err);
1604 if (!de)
1605 goto cleanup;
1606 err = add_dirent_to_buf(handle, dentry, inode, de, bh);
1607 bh = NULL;
1608 goto cleanup;
1609
1610journal_error:
1611 ext3_std_error(dir->i_sb, err);
1612cleanup:
1613 if (bh)
1614 brelse(bh);
1615 dx_release(frames);
1616 return err;
1617}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001618
1619/*
1620 * ext3_delete_entry deletes a directory entry by merging it with the
1621 * previous entry
1622 */
Mingming Caoae6ddcc2006-09-27 01:49:27 -07001623static int ext3_delete_entry (handle_t *handle,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001624 struct inode * dir,
1625 struct ext3_dir_entry_2 * de_del,
1626 struct buffer_head * bh)
1627{
1628 struct ext3_dir_entry_2 * de, * pde;
1629 int i;
1630
1631 i = 0;
1632 pde = NULL;
1633 de = (struct ext3_dir_entry_2 *) bh->b_data;
1634 while (i < bh->b_size) {
1635 if (!ext3_check_dir_entry("ext3_delete_entry", dir, de, bh, i))
1636 return -EIO;
1637 if (de == de_del) {
Namhyung Kimfbcae8e2010-11-19 16:28:35 +09001638 int err;
1639
Linus Torvalds1da177e2005-04-16 15:20:36 -07001640 BUFFER_TRACE(bh, "get_write_access");
Namhyung Kimfbcae8e2010-11-19 16:28:35 +09001641 err = ext3_journal_get_write_access(handle, bh);
1642 if (err)
1643 goto journal_error;
1644
Linus Torvalds1da177e2005-04-16 15:20:36 -07001645 if (pde)
Jan Kara7c06a8d2007-11-14 17:00:19 -08001646 pde->rec_len = ext3_rec_len_to_disk(
1647 ext3_rec_len_from_disk(pde->rec_len) +
1648 ext3_rec_len_from_disk(de->rec_len));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001649 else
1650 de->inode = 0;
1651 dir->i_version++;
1652 BUFFER_TRACE(bh, "call ext3_journal_dirty_metadata");
Namhyung Kimfbcae8e2010-11-19 16:28:35 +09001653 err = ext3_journal_dirty_metadata(handle, bh);
1654 if (err) {
1655journal_error:
1656 ext3_std_error(dir->i_sb, err);
1657 return err;
1658 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001659 return 0;
1660 }
Jan Kara7c06a8d2007-11-14 17:00:19 -08001661 i += ext3_rec_len_from_disk(de->rec_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001662 pde = de;
Jan Kara7c06a8d2007-11-14 17:00:19 -08001663 de = ext3_next_entry(de);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001664 }
1665 return -ENOENT;
1666}
1667
Linus Torvalds1da177e2005-04-16 15:20:36 -07001668static int ext3_add_nondir(handle_t *handle,
1669 struct dentry *dentry, struct inode *inode)
1670{
1671 int err = ext3_add_entry(handle, dentry, inode);
1672 if (!err) {
1673 ext3_mark_inode_dirty(handle, inode);
Al Viroc38012d2008-12-30 02:02:50 -05001674 unlock_new_inode(inode);
Al Viro8fc37ec2012-07-19 09:18:15 +04001675 d_instantiate(dentry, inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001676 return 0;
1677 }
Eric Sandeen731b9a52007-02-10 01:46:16 -08001678 drop_nlink(inode);
Al Viroc38012d2008-12-30 02:02:50 -05001679 unlock_new_inode(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001680 iput(inode);
1681 return err;
1682}
1683
1684/*
1685 * By the time this is called, we already have created
1686 * the directory cache entry for the new file, but it
1687 * is so far negative - it has no inode.
1688 *
1689 * If the create succeeds, we fill in the inode information
Mingming Caoae6ddcc2006-09-27 01:49:27 -07001690 * with d_instantiate().
Linus Torvalds1da177e2005-04-16 15:20:36 -07001691 */
Al Viro4acdaf22011-07-26 01:42:34 -04001692static int ext3_create (struct inode * dir, struct dentry * dentry, umode_t mode,
Al Viroebfc3b42012-06-10 18:05:36 -04001693 bool excl)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001694{
Mingming Caoae6ddcc2006-09-27 01:49:27 -07001695 handle_t *handle;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001696 struct inode * inode;
1697 int err, retries = 0;
1698
Christoph Hellwig871a2932010-03-03 09:05:07 -05001699 dquot_initialize(dir);
Christoph Hellwig907f4552010-03-03 09:05:06 -05001700
Linus Torvalds1da177e2005-04-16 15:20:36 -07001701retry:
Jan Kara1f545872005-06-23 22:01:04 -07001702 handle = ext3_journal_start(dir, EXT3_DATA_TRANS_BLOCKS(dir->i_sb) +
Linus Torvalds1da177e2005-04-16 15:20:36 -07001703 EXT3_INDEX_EXTRA_TRANS_BLOCKS + 3 +
Dmitry Monakhovc4590012009-12-09 03:05:30 +03001704 EXT3_MAXQUOTAS_INIT_BLOCKS(dir->i_sb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001705 if (IS_ERR(handle))
1706 return PTR_ERR(handle);
1707
1708 if (IS_DIRSYNC(dir))
1709 handle->h_sync = 1;
1710
Eric Paris2a7dba32011-02-01 11:05:39 -05001711 inode = ext3_new_inode (handle, dir, &dentry->d_name, mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001712 err = PTR_ERR(inode);
1713 if (!IS_ERR(inode)) {
1714 inode->i_op = &ext3_file_inode_operations;
1715 inode->i_fop = &ext3_file_operations;
1716 ext3_set_aops(inode);
1717 err = ext3_add_nondir(handle, dentry, inode);
1718 }
1719 ext3_journal_stop(handle);
1720 if (err == -ENOSPC && ext3_should_retry_alloc(dir->i_sb, &retries))
1721 goto retry;
1722 return err;
1723}
1724
1725static int ext3_mknod (struct inode * dir, struct dentry *dentry,
Al Viro1a67aaf2011-07-26 01:52:52 -04001726 umode_t mode, dev_t rdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001727{
1728 handle_t *handle;
1729 struct inode *inode;
1730 int err, retries = 0;
1731
1732 if (!new_valid_dev(rdev))
1733 return -EINVAL;
1734
Christoph Hellwig871a2932010-03-03 09:05:07 -05001735 dquot_initialize(dir);
Christoph Hellwig907f4552010-03-03 09:05:06 -05001736
Linus Torvalds1da177e2005-04-16 15:20:36 -07001737retry:
Jan Kara1f545872005-06-23 22:01:04 -07001738 handle = ext3_journal_start(dir, EXT3_DATA_TRANS_BLOCKS(dir->i_sb) +
Dave Kleikampe9ad5622006-09-27 01:49:35 -07001739 EXT3_INDEX_EXTRA_TRANS_BLOCKS + 3 +
Dmitry Monakhovc4590012009-12-09 03:05:30 +03001740 EXT3_MAXQUOTAS_INIT_BLOCKS(dir->i_sb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001741 if (IS_ERR(handle))
1742 return PTR_ERR(handle);
1743
1744 if (IS_DIRSYNC(dir))
1745 handle->h_sync = 1;
1746
Eric Paris2a7dba32011-02-01 11:05:39 -05001747 inode = ext3_new_inode (handle, dir, &dentry->d_name, mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001748 err = PTR_ERR(inode);
1749 if (!IS_ERR(inode)) {
1750 init_special_inode(inode, inode->i_mode, rdev);
1751#ifdef CONFIG_EXT3_FS_XATTR
1752 inode->i_op = &ext3_special_inode_operations;
1753#endif
1754 err = ext3_add_nondir(handle, dentry, inode);
1755 }
1756 ext3_journal_stop(handle);
1757 if (err == -ENOSPC && ext3_should_retry_alloc(dir->i_sb, &retries))
1758 goto retry;
1759 return err;
1760}
1761
Al Viroe6bbef92013-06-11 12:52:02 +04001762static int ext3_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
1763{
1764 handle_t *handle;
1765 struct inode *inode;
1766 int err, retries = 0;
1767
1768 dquot_initialize(dir);
1769
1770retry:
1771 handle = ext3_journal_start(dir, EXT3_MAXQUOTAS_INIT_BLOCKS(dir->i_sb) +
1772 4 + EXT3_XATTR_TRANS_BLOCKS);
1773
1774 if (IS_ERR(handle))
1775 return PTR_ERR(handle);
1776
1777 inode = ext3_new_inode (handle, dir, NULL, mode);
1778 err = PTR_ERR(inode);
1779 if (!IS_ERR(inode)) {
1780 inode->i_op = &ext3_file_inode_operations;
1781 inode->i_fop = &ext3_file_operations;
1782 ext3_set_aops(inode);
Zheng Liudda56902013-07-20 22:03:20 -04001783 d_tmpfile(dentry, inode);
Al Viroe6bbef92013-06-11 12:52:02 +04001784 err = ext3_orphan_add(handle, inode);
1785 if (err)
Miklos Szeredi43ae9e32013-10-10 16:48:19 +02001786 goto err_unlock_inode;
Al Viroe6bbef92013-06-11 12:52:02 +04001787 mark_inode_dirty(inode);
Al Viroe6bbef92013-06-11 12:52:02 +04001788 unlock_new_inode(inode);
1789 }
1790 ext3_journal_stop(handle);
1791 if (err == -ENOSPC && ext3_should_retry_alloc(dir->i_sb, &retries))
1792 goto retry;
1793 return err;
Miklos Szeredi43ae9e32013-10-10 16:48:19 +02001794err_unlock_inode:
Al Viroe6bbef92013-06-11 12:52:02 +04001795 ext3_journal_stop(handle);
1796 unlock_new_inode(inode);
Al Viroe6bbef92013-06-11 12:52:02 +04001797 return err;
1798}
1799
Al Viro18bb1db2011-07-26 01:41:39 -04001800static int ext3_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001801{
1802 handle_t *handle;
1803 struct inode * inode;
Namhyung Kim2b543ed2010-11-16 20:18:12 +09001804 struct buffer_head * dir_block = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001805 struct ext3_dir_entry_2 * de;
1806 int err, retries = 0;
1807
1808 if (dir->i_nlink >= EXT3_LINK_MAX)
1809 return -EMLINK;
1810
Christoph Hellwig871a2932010-03-03 09:05:07 -05001811 dquot_initialize(dir);
Christoph Hellwig907f4552010-03-03 09:05:06 -05001812
Linus Torvalds1da177e2005-04-16 15:20:36 -07001813retry:
Jan Kara1f545872005-06-23 22:01:04 -07001814 handle = ext3_journal_start(dir, EXT3_DATA_TRANS_BLOCKS(dir->i_sb) +
Linus Torvalds1da177e2005-04-16 15:20:36 -07001815 EXT3_INDEX_EXTRA_TRANS_BLOCKS + 3 +
Dmitry Monakhovc4590012009-12-09 03:05:30 +03001816 EXT3_MAXQUOTAS_INIT_BLOCKS(dir->i_sb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001817 if (IS_ERR(handle))
1818 return PTR_ERR(handle);
1819
1820 if (IS_DIRSYNC(dir))
1821 handle->h_sync = 1;
1822
Eric Paris2a7dba32011-02-01 11:05:39 -05001823 inode = ext3_new_inode (handle, dir, &dentry->d_name, S_IFDIR | mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001824 err = PTR_ERR(inode);
1825 if (IS_ERR(inode))
1826 goto out_stop;
1827
1828 inode->i_op = &ext3_dir_inode_operations;
1829 inode->i_fop = &ext3_dir_operations;
1830 inode->i_size = EXT3_I(inode)->i_disksize = inode->i_sb->s_blocksize;
Carlos Maiolinoc3d59ad2012-10-02 23:59:23 -03001831 if (!(dir_block = ext3_dir_bread(handle, inode, 0, 1, &err)))
Namhyung Kim2b543ed2010-11-16 20:18:12 +09001832 goto out_clear_inode;
1833
Linus Torvalds1da177e2005-04-16 15:20:36 -07001834 BUFFER_TRACE(dir_block, "get_write_access");
Namhyung Kim2b543ed2010-11-16 20:18:12 +09001835 err = ext3_journal_get_write_access(handle, dir_block);
1836 if (err)
1837 goto out_clear_inode;
1838
Linus Torvalds1da177e2005-04-16 15:20:36 -07001839 de = (struct ext3_dir_entry_2 *) dir_block->b_data;
1840 de->inode = cpu_to_le32(inode->i_ino);
1841 de->name_len = 1;
Jan Kara7c06a8d2007-11-14 17:00:19 -08001842 de->rec_len = ext3_rec_len_to_disk(EXT3_DIR_REC_LEN(de->name_len));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001843 strcpy (de->name, ".");
1844 ext3_set_de_type(dir->i_sb, de, S_IFDIR);
Jan Kara7c06a8d2007-11-14 17:00:19 -08001845 de = ext3_next_entry(de);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001846 de->inode = cpu_to_le32(dir->i_ino);
Jan Kara7c06a8d2007-11-14 17:00:19 -08001847 de->rec_len = ext3_rec_len_to_disk(inode->i_sb->s_blocksize -
1848 EXT3_DIR_REC_LEN(1));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001849 de->name_len = 2;
1850 strcpy (de->name, "..");
1851 ext3_set_de_type(dir->i_sb, de, S_IFDIR);
Miklos Szeredibfe86842011-10-28 14:13:29 +02001852 set_nlink(inode, 2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001853 BUFFER_TRACE(dir_block, "call ext3_journal_dirty_metadata");
Namhyung Kim2b543ed2010-11-16 20:18:12 +09001854 err = ext3_journal_dirty_metadata(handle, dir_block);
1855 if (err)
1856 goto out_clear_inode;
1857
1858 err = ext3_mark_inode_dirty(handle, inode);
1859 if (!err)
1860 err = ext3_add_entry (handle, dentry, inode);
1861
Linus Torvalds1da177e2005-04-16 15:20:36 -07001862 if (err) {
Namhyung Kim2b543ed2010-11-16 20:18:12 +09001863out_clear_inode:
Miklos Szeredi6d6b77f2011-10-28 14:13:28 +02001864 clear_nlink(inode);
Al Viroc38012d2008-12-30 02:02:50 -05001865 unlock_new_inode(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001866 ext3_mark_inode_dirty(handle, inode);
1867 iput (inode);
1868 goto out_stop;
1869 }
Dave Hansend8c76e62006-09-30 23:29:04 -07001870 inc_nlink(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001871 ext3_update_dx_flag(dir);
Namhyung Kim2b543ed2010-11-16 20:18:12 +09001872 err = ext3_mark_inode_dirty(handle, dir);
1873 if (err)
1874 goto out_clear_inode;
1875
Al Viroc38012d2008-12-30 02:02:50 -05001876 unlock_new_inode(inode);
Al Viro8fc37ec2012-07-19 09:18:15 +04001877 d_instantiate(dentry, inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001878out_stop:
Namhyung Kim2b543ed2010-11-16 20:18:12 +09001879 brelse(dir_block);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001880 ext3_journal_stop(handle);
1881 if (err == -ENOSPC && ext3_should_retry_alloc(dir->i_sb, &retries))
1882 goto retry;
1883 return err;
1884}
1885
1886/*
1887 * routine to check that the specified directory is empty (for rmdir)
1888 */
1889static int empty_dir (struct inode * inode)
1890{
1891 unsigned long offset;
1892 struct buffer_head * bh;
1893 struct ext3_dir_entry_2 * de, * de1;
1894 struct super_block * sb;
1895 int err = 0;
1896
1897 sb = inode->i_sb;
1898 if (inode->i_size < EXT3_DIR_REC_LEN(1) + EXT3_DIR_REC_LEN(2) ||
Carlos Maiolinoc3d59ad2012-10-02 23:59:23 -03001899 !(bh = ext3_dir_bread(NULL, inode, 0, 0, &err))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001900 if (err)
Harvey Harrisone05b6b52008-04-28 02:16:15 -07001901 ext3_error(inode->i_sb, __func__,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001902 "error %d reading directory #%lu offset 0",
1903 err, inode->i_ino);
1904 else
Harvey Harrisone05b6b52008-04-28 02:16:15 -07001905 ext3_warning(inode->i_sb, __func__,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001906 "bad directory (dir #%lu) - no data block",
1907 inode->i_ino);
1908 return 1;
1909 }
1910 de = (struct ext3_dir_entry_2 *) bh->b_data;
Jan Kara7c06a8d2007-11-14 17:00:19 -08001911 de1 = ext3_next_entry(de);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001912 if (le32_to_cpu(de->inode) != inode->i_ino ||
Mingming Caoae6ddcc2006-09-27 01:49:27 -07001913 !le32_to_cpu(de1->inode) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07001914 strcmp (".", de->name) ||
1915 strcmp ("..", de1->name)) {
Dave Kleikampe9ad5622006-09-27 01:49:35 -07001916 ext3_warning (inode->i_sb, "empty_dir",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001917 "bad directory (dir #%lu) - no `.' or `..'",
1918 inode->i_ino);
1919 brelse (bh);
1920 return 1;
1921 }
Jan Kara7c06a8d2007-11-14 17:00:19 -08001922 offset = ext3_rec_len_from_disk(de->rec_len) +
1923 ext3_rec_len_from_disk(de1->rec_len);
1924 de = ext3_next_entry(de1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001925 while (offset < inode->i_size ) {
1926 if (!bh ||
1927 (void *) de >= (void *) (bh->b_data+sb->s_blocksize)) {
1928 err = 0;
1929 brelse (bh);
Carlos Maiolinoc3d59ad2012-10-02 23:59:23 -03001930 if (!(bh = ext3_dir_bread (NULL, inode,
1931 offset >> EXT3_BLOCK_SIZE_BITS(sb), 0, &err))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001932 if (err)
Harvey Harrisone05b6b52008-04-28 02:16:15 -07001933 ext3_error(sb, __func__,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001934 "error %d reading directory"
1935 " #%lu offset %lu",
1936 err, inode->i_ino, offset);
1937 offset += sb->s_blocksize;
1938 continue;
1939 }
1940 de = (struct ext3_dir_entry_2 *) bh->b_data;
1941 }
1942 if (!ext3_check_dir_entry("empty_dir", inode, de, bh, offset)) {
1943 de = (struct ext3_dir_entry_2 *)(bh->b_data +
1944 sb->s_blocksize);
1945 offset = (offset | (sb->s_blocksize - 1)) + 1;
1946 continue;
1947 }
1948 if (le32_to_cpu(de->inode)) {
1949 brelse (bh);
1950 return 0;
1951 }
Jan Kara7c06a8d2007-11-14 17:00:19 -08001952 offset += ext3_rec_len_from_disk(de->rec_len);
1953 de = ext3_next_entry(de);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001954 }
1955 brelse (bh);
1956 return 1;
1957}
1958
1959/* ext3_orphan_add() links an unlinked or truncated inode into a list of
1960 * such inodes, starting at the superblock, in case we crash before the
1961 * file is closed/deleted, or in case the inode truncate spans multiple
1962 * transactions and the last transaction is not recovered after a crash.
1963 *
1964 * At filesystem recovery time, we walk this list deleting unlinked
1965 * inodes and truncating linked inodes in ext3_orphan_cleanup().
1966 */
1967int ext3_orphan_add(handle_t *handle, struct inode *inode)
1968{
1969 struct super_block *sb = inode->i_sb;
1970 struct ext3_iloc iloc;
1971 int err = 0, rc;
1972
Eric Sandeenb8a052d2009-12-14 13:00:30 -06001973 mutex_lock(&EXT3_SB(sb)->s_orphan_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001974 if (!list_empty(&EXT3_I(inode)->i_orphan))
1975 goto out_unlock;
1976
1977 /* Orphan handling is only valid for files with data blocks
1978 * being truncated, or files being unlinked. */
1979
1980 /* @@@ FIXME: Observation from aviro:
Mingming Caoae6ddcc2006-09-27 01:49:27 -07001981 * I think I can trigger J_ASSERT in ext3_orphan_add(). We block
Eric Sandeenb8a052d2009-12-14 13:00:30 -06001982 * here (on s_orphan_lock), so race with ext3_link() which might bump
Linus Torvalds1da177e2005-04-16 15:20:36 -07001983 * ->i_nlink. For, say it, character device. Not a regular file,
1984 * not a directory, not a symlink and ->i_nlink > 0.
Eric Sandeenb8a052d2009-12-14 13:00:30 -06001985 *
1986 * tytso, 4/25/2009: I'm not sure how that could happen;
1987 * shouldn't the fs core protect us from these sort of
1988 * unlink()/link() races?
Linus Torvalds1da177e2005-04-16 15:20:36 -07001989 */
1990 J_ASSERT ((S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1991 S_ISLNK(inode->i_mode)) || inode->i_nlink == 0);
1992
1993 BUFFER_TRACE(EXT3_SB(sb)->s_sbh, "get_write_access");
1994 err = ext3_journal_get_write_access(handle, EXT3_SB(sb)->s_sbh);
1995 if (err)
1996 goto out_unlock;
1997
1998 err = ext3_reserve_inode_write(handle, inode, &iloc);
1999 if (err)
2000 goto out_unlock;
2001
2002 /* Insert this inode at the head of the on-disk orphan list... */
2003 NEXT_ORPHAN(inode) = le32_to_cpu(EXT3_SB(sb)->s_es->s_last_orphan);
2004 EXT3_SB(sb)->s_es->s_last_orphan = cpu_to_le32(inode->i_ino);
2005 err = ext3_journal_dirty_metadata(handle, EXT3_SB(sb)->s_sbh);
2006 rc = ext3_mark_iloc_dirty(handle, inode, &iloc);
2007 if (!err)
2008 err = rc;
2009
2010 /* Only add to the head of the in-memory list if all the
2011 * previous operations succeeded. If the orphan_add is going to
2012 * fail (possibly taking the journal offline), we can't risk
2013 * leaving the inode on the orphan list: stray orphan-list
2014 * entries can cause panics at unmount time.
2015 *
2016 * This is safe: on error we're going to ignore the orphan list
2017 * anyway on the next recovery. */
2018 if (!err)
2019 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
2020
Eric Sandeeneee194e2006-09-27 01:49:30 -07002021 jbd_debug(4, "superblock will point to %lu\n", inode->i_ino);
2022 jbd_debug(4, "orphan inode %lu will point to %d\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07002023 inode->i_ino, NEXT_ORPHAN(inode));
2024out_unlock:
Eric Sandeenb8a052d2009-12-14 13:00:30 -06002025 mutex_unlock(&EXT3_SB(sb)->s_orphan_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002026 ext3_std_error(inode->i_sb, err);
2027 return err;
2028}
2029
2030/*
2031 * ext3_orphan_del() removes an unlinked or truncated inode from the list
2032 * of such inodes stored on disk, because it is finally being cleaned up.
2033 */
2034int ext3_orphan_del(handle_t *handle, struct inode *inode)
2035{
2036 struct list_head *prev;
2037 struct ext3_inode_info *ei = EXT3_I(inode);
2038 struct ext3_sb_info *sbi;
2039 unsigned long ino_next;
2040 struct ext3_iloc iloc;
2041 int err = 0;
2042
Eric Sandeenb8a052d2009-12-14 13:00:30 -06002043 mutex_lock(&EXT3_SB(inode->i_sb)->s_orphan_lock);
2044 if (list_empty(&ei->i_orphan))
2045 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002046
2047 ino_next = NEXT_ORPHAN(inode);
2048 prev = ei->i_orphan.prev;
2049 sbi = EXT3_SB(inode->i_sb);
2050
2051 jbd_debug(4, "remove inode %lu from orphan list\n", inode->i_ino);
2052
2053 list_del_init(&ei->i_orphan);
2054
2055 /* If we're on an error path, we may not have a valid
2056 * transaction handle with which to update the orphan list on
2057 * disk, but we still need to remove the inode from the linked
2058 * list in memory. */
2059 if (!handle)
2060 goto out;
2061
2062 err = ext3_reserve_inode_write(handle, inode, &iloc);
2063 if (err)
2064 goto out_err;
2065
2066 if (prev == &sbi->s_orphan) {
2067 jbd_debug(4, "superblock will point to %lu\n", ino_next);
2068 BUFFER_TRACE(sbi->s_sbh, "get_write_access");
2069 err = ext3_journal_get_write_access(handle, sbi->s_sbh);
2070 if (err)
2071 goto out_brelse;
2072 sbi->s_es->s_last_orphan = cpu_to_le32(ino_next);
2073 err = ext3_journal_dirty_metadata(handle, sbi->s_sbh);
2074 } else {
2075 struct ext3_iloc iloc2;
2076 struct inode *i_prev =
2077 &list_entry(prev, struct ext3_inode_info, i_orphan)->vfs_inode;
2078
2079 jbd_debug(4, "orphan inode %lu will point to %lu\n",
2080 i_prev->i_ino, ino_next);
2081 err = ext3_reserve_inode_write(handle, i_prev, &iloc2);
2082 if (err)
2083 goto out_brelse;
2084 NEXT_ORPHAN(i_prev) = ino_next;
2085 err = ext3_mark_iloc_dirty(handle, i_prev, &iloc2);
2086 }
2087 if (err)
2088 goto out_brelse;
2089 NEXT_ORPHAN(inode) = 0;
2090 err = ext3_mark_iloc_dirty(handle, inode, &iloc);
2091
2092out_err:
2093 ext3_std_error(inode->i_sb, err);
2094out:
Eric Sandeenb8a052d2009-12-14 13:00:30 -06002095 mutex_unlock(&EXT3_SB(inode->i_sb)->s_orphan_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002096 return err;
2097
2098out_brelse:
2099 brelse(iloc.bh);
2100 goto out_err;
2101}
2102
2103static int ext3_rmdir (struct inode * dir, struct dentry *dentry)
2104{
2105 int retval;
2106 struct inode * inode;
2107 struct buffer_head * bh;
2108 struct ext3_dir_entry_2 * de;
2109 handle_t *handle;
2110
2111 /* Initialize quotas before so that eventual writes go in
2112 * separate transaction */
Christoph Hellwig871a2932010-03-03 09:05:07 -05002113 dquot_initialize(dir);
2114 dquot_initialize(dentry->d_inode);
Christoph Hellwig907f4552010-03-03 09:05:06 -05002115
Jan Kara1f545872005-06-23 22:01:04 -07002116 handle = ext3_journal_start(dir, EXT3_DELETE_TRANS_BLOCKS(dir->i_sb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002117 if (IS_ERR(handle))
2118 return PTR_ERR(handle);
2119
2120 retval = -ENOENT;
Al Viro734711a2008-08-24 07:26:48 -04002121 bh = ext3_find_entry(dir, &dentry->d_name, &de);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002122 if (!bh)
2123 goto end_rmdir;
2124
2125 if (IS_DIRSYNC(dir))
2126 handle->h_sync = 1;
2127
2128 inode = dentry->d_inode;
2129
2130 retval = -EIO;
2131 if (le32_to_cpu(de->inode) != inode->i_ino)
2132 goto end_rmdir;
2133
2134 retval = -ENOTEMPTY;
2135 if (!empty_dir (inode))
2136 goto end_rmdir;
2137
2138 retval = ext3_delete_entry(handle, dir, de, bh);
2139 if (retval)
2140 goto end_rmdir;
2141 if (inode->i_nlink != 2)
2142 ext3_warning (inode->i_sb, "ext3_rmdir",
2143 "empty directory has nlink!=2 (%d)",
2144 inode->i_nlink);
2145 inode->i_version++;
Dave Hansence71ec32006-09-30 23:29:06 -07002146 clear_nlink(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002147 /* There's no need to set i_disksize: the fact that i_nlink is
2148 * zero will ensure that the right thing happens during any
2149 * recovery. */
2150 inode->i_size = 0;
2151 ext3_orphan_add(handle, inode);
2152 inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME_SEC;
2153 ext3_mark_inode_dirty(handle, inode);
Dave Hansen9a53c3a2006-09-30 23:29:03 -07002154 drop_nlink(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002155 ext3_update_dx_flag(dir);
2156 ext3_mark_inode_dirty(handle, dir);
2157
2158end_rmdir:
2159 ext3_journal_stop(handle);
2160 brelse (bh);
2161 return retval;
2162}
2163
2164static int ext3_unlink(struct inode * dir, struct dentry *dentry)
2165{
2166 int retval;
2167 struct inode * inode;
2168 struct buffer_head * bh;
2169 struct ext3_dir_entry_2 * de;
2170 handle_t *handle;
2171
Lukas Czerner785c4bc2011-05-23 18:33:01 +02002172 trace_ext3_unlink_enter(dir, dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002173 /* Initialize quotas before so that eventual writes go
2174 * in separate transaction */
Christoph Hellwig871a2932010-03-03 09:05:07 -05002175 dquot_initialize(dir);
2176 dquot_initialize(dentry->d_inode);
Christoph Hellwig907f4552010-03-03 09:05:06 -05002177
Jan Kara1f545872005-06-23 22:01:04 -07002178 handle = ext3_journal_start(dir, EXT3_DELETE_TRANS_BLOCKS(dir->i_sb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002179 if (IS_ERR(handle))
2180 return PTR_ERR(handle);
2181
2182 if (IS_DIRSYNC(dir))
2183 handle->h_sync = 1;
2184
2185 retval = -ENOENT;
Al Viro734711a2008-08-24 07:26:48 -04002186 bh = ext3_find_entry(dir, &dentry->d_name, &de);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002187 if (!bh)
2188 goto end_unlink;
2189
2190 inode = dentry->d_inode;
2191
2192 retval = -EIO;
2193 if (le32_to_cpu(de->inode) != inode->i_ino)
2194 goto end_unlink;
2195
2196 if (!inode->i_nlink) {
2197 ext3_warning (inode->i_sb, "ext3_unlink",
2198 "Deleting nonexistent file (%lu), %d",
2199 inode->i_ino, inode->i_nlink);
Miklos Szeredibfe86842011-10-28 14:13:29 +02002200 set_nlink(inode, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002201 }
2202 retval = ext3_delete_entry(handle, dir, de, bh);
2203 if (retval)
2204 goto end_unlink;
2205 dir->i_ctime = dir->i_mtime = CURRENT_TIME_SEC;
2206 ext3_update_dx_flag(dir);
2207 ext3_mark_inode_dirty(handle, dir);
Dave Hansen9a53c3a2006-09-30 23:29:03 -07002208 drop_nlink(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002209 if (!inode->i_nlink)
2210 ext3_orphan_add(handle, inode);
2211 inode->i_ctime = dir->i_ctime;
2212 ext3_mark_inode_dirty(handle, inode);
2213 retval = 0;
2214
2215end_unlink:
2216 ext3_journal_stop(handle);
2217 brelse (bh);
Lukas Czerner785c4bc2011-05-23 18:33:01 +02002218 trace_ext3_unlink_exit(dentry, retval);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002219 return retval;
2220}
2221
2222static int ext3_symlink (struct inode * dir,
2223 struct dentry *dentry, const char * symname)
2224{
2225 handle_t *handle;
2226 struct inode * inode;
2227 int l, err, retries = 0;
Jan Karaae54870a2011-04-21 23:47:16 +02002228 int credits;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002229
2230 l = strlen(symname)+1;
2231 if (l > dir->i_sb->s_blocksize)
2232 return -ENAMETOOLONG;
2233
Christoph Hellwig871a2932010-03-03 09:05:07 -05002234 dquot_initialize(dir);
Christoph Hellwig907f4552010-03-03 09:05:06 -05002235
Jan Karaae54870a2011-04-21 23:47:16 +02002236 if (l > EXT3_N_BLOCKS * 4) {
2237 /*
2238 * For non-fast symlinks, we just allocate inode and put it on
2239 * orphan list in the first transaction => we need bitmap,
Eric Sandeend2db60d2011-08-11 09:51:46 -05002240 * group descriptor, sb, inode block, quota blocks, and
2241 * possibly selinux xattr blocks.
Jan Karaae54870a2011-04-21 23:47:16 +02002242 */
Eric Sandeend2db60d2011-08-11 09:51:46 -05002243 credits = 4 + EXT3_MAXQUOTAS_INIT_BLOCKS(dir->i_sb) +
2244 EXT3_XATTR_TRANS_BLOCKS;
Jan Karaae54870a2011-04-21 23:47:16 +02002245 } else {
2246 /*
2247 * Fast symlink. We have to add entry to directory
2248 * (EXT3_DATA_TRANS_BLOCKS + EXT3_INDEX_EXTRA_TRANS_BLOCKS),
2249 * allocate new inode (bitmap, group descriptor, inode block,
2250 * quota blocks, sb is already counted in previous macros).
2251 */
2252 credits = EXT3_DATA_TRANS_BLOCKS(dir->i_sb) +
2253 EXT3_INDEX_EXTRA_TRANS_BLOCKS + 3 +
2254 EXT3_MAXQUOTAS_INIT_BLOCKS(dir->i_sb);
2255 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002256retry:
Jan Karaae54870a2011-04-21 23:47:16 +02002257 handle = ext3_journal_start(dir, credits);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002258 if (IS_ERR(handle))
2259 return PTR_ERR(handle);
2260
2261 if (IS_DIRSYNC(dir))
2262 handle->h_sync = 1;
2263
Eric Paris2a7dba32011-02-01 11:05:39 -05002264 inode = ext3_new_inode (handle, dir, &dentry->d_name, S_IFLNK|S_IRWXUGO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002265 err = PTR_ERR(inode);
2266 if (IS_ERR(inode))
2267 goto out_stop;
2268
Jan Karaae54870a2011-04-21 23:47:16 +02002269 if (l > EXT3_N_BLOCKS * 4) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002270 inode->i_op = &ext3_symlink_inode_operations;
2271 ext3_set_aops(inode);
2272 /*
Jan Karaae54870a2011-04-21 23:47:16 +02002273 * We cannot call page_symlink() with transaction started
2274 * because it calls into ext3_write_begin() which acquires page
2275 * lock which ranks below transaction start (and it can also
2276 * wait for journal commit if we are running out of space). So
2277 * we have to stop transaction now and restart it when symlink
2278 * contents is written.
2279 *
2280 * To keep fs consistent in case of crash, we have to put inode
2281 * to orphan list in the mean time.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002282 */
Jan Karaae54870a2011-04-21 23:47:16 +02002283 drop_nlink(inode);
2284 err = ext3_orphan_add(handle, inode);
2285 ext3_journal_stop(handle);
2286 if (err)
2287 goto err_drop_inode;
Nick Piggin54566b22009-01-04 12:00:53 -08002288 err = __page_symlink(inode, symname, l, 1);
Jan Karaae54870a2011-04-21 23:47:16 +02002289 if (err)
2290 goto err_drop_inode;
2291 /*
2292 * Now inode is being linked into dir (EXT3_DATA_TRANS_BLOCKS
2293 * + EXT3_INDEX_EXTRA_TRANS_BLOCKS), inode is also modified
2294 */
2295 handle = ext3_journal_start(dir,
2296 EXT3_DATA_TRANS_BLOCKS(dir->i_sb) +
2297 EXT3_INDEX_EXTRA_TRANS_BLOCKS + 1);
2298 if (IS_ERR(handle)) {
2299 err = PTR_ERR(handle);
2300 goto err_drop_inode;
2301 }
Al Viro0ce8c0102012-01-08 19:50:23 -05002302 set_nlink(inode, 1);
Jan Karaae54870a2011-04-21 23:47:16 +02002303 err = ext3_orphan_del(handle, inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002304 if (err) {
Jan Karaae54870a2011-04-21 23:47:16 +02002305 ext3_journal_stop(handle);
Eric Sandeen731b9a52007-02-10 01:46:16 -08002306 drop_nlink(inode);
Jan Karaae54870a2011-04-21 23:47:16 +02002307 goto err_drop_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002308 }
2309 } else {
2310 inode->i_op = &ext3_fast_symlink_inode_operations;
2311 memcpy((char*)&EXT3_I(inode)->i_data,symname,l);
2312 inode->i_size = l-1;
2313 }
2314 EXT3_I(inode)->i_disksize = inode->i_size;
2315 err = ext3_add_nondir(handle, dentry, inode);
2316out_stop:
2317 ext3_journal_stop(handle);
2318 if (err == -ENOSPC && ext3_should_retry_alloc(dir->i_sb, &retries))
2319 goto retry;
2320 return err;
Jan Karaae54870a2011-04-21 23:47:16 +02002321err_drop_inode:
2322 unlock_new_inode(inode);
Jan Kara86c4f6d82011-04-27 18:20:44 +02002323 iput(inode);
Jan Karaae54870a2011-04-21 23:47:16 +02002324 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002325}
2326
2327static int ext3_link (struct dentry * old_dentry,
2328 struct inode * dir, struct dentry *dentry)
2329{
2330 handle_t *handle;
2331 struct inode *inode = old_dentry->d_inode;
2332 int err, retries = 0;
2333
2334 if (inode->i_nlink >= EXT3_LINK_MAX)
2335 return -EMLINK;
Christoph Hellwig907f4552010-03-03 09:05:06 -05002336
Christoph Hellwig871a2932010-03-03 09:05:07 -05002337 dquot_initialize(dir);
Christoph Hellwig907f4552010-03-03 09:05:06 -05002338
Linus Torvalds1da177e2005-04-16 15:20:36 -07002339retry:
Jan Kara1f545872005-06-23 22:01:04 -07002340 handle = ext3_journal_start(dir, EXT3_DATA_TRANS_BLOCKS(dir->i_sb) +
Al Viroe6bbef92013-06-11 12:52:02 +04002341 EXT3_INDEX_EXTRA_TRANS_BLOCKS + 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002342 if (IS_ERR(handle))
2343 return PTR_ERR(handle);
2344
2345 if (IS_DIRSYNC(dir))
2346 handle->h_sync = 1;
2347
2348 inode->i_ctime = CURRENT_TIME_SEC;
Eric Sandeen731b9a52007-02-10 01:46:16 -08002349 inc_nlink(inode);
Al Viro7de9c6ee2010-10-23 11:11:40 -04002350 ihold(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002351
Al Viroc38012d2008-12-30 02:02:50 -05002352 err = ext3_add_entry(handle, dentry, inode);
2353 if (!err) {
2354 ext3_mark_inode_dirty(handle, inode);
Al Viroe6bbef92013-06-11 12:52:02 +04002355 /* this can happen only for tmpfile being
2356 * linked the first time
2357 */
2358 if (inode->i_nlink == 1)
2359 ext3_orphan_del(handle, inode);
Al Viroc38012d2008-12-30 02:02:50 -05002360 d_instantiate(dentry, inode);
2361 } else {
2362 drop_nlink(inode);
2363 iput(inode);
2364 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002365 ext3_journal_stop(handle);
2366 if (err == -ENOSPC && ext3_should_retry_alloc(dir->i_sb, &retries))
2367 goto retry;
2368 return err;
2369}
2370
2371#define PARENT_INO(buffer) \
Jan Kara7c06a8d2007-11-14 17:00:19 -08002372 (ext3_next_entry((struct ext3_dir_entry_2 *)(buffer))->inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002373
2374/*
2375 * Anybody can rename anything with this: the permission checks are left to the
2376 * higher-level routines.
2377 */
2378static int ext3_rename (struct inode * old_dir, struct dentry *old_dentry,
2379 struct inode * new_dir,struct dentry *new_dentry)
2380{
2381 handle_t *handle;
2382 struct inode * old_inode, * new_inode;
2383 struct buffer_head * old_bh, * new_bh, * dir_bh;
2384 struct ext3_dir_entry_2 * old_de, * new_de;
Theodore Ts'oe7c8f502009-04-03 01:34:49 -04002385 int retval, flush_file = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002386
Christoph Hellwig871a2932010-03-03 09:05:07 -05002387 dquot_initialize(old_dir);
2388 dquot_initialize(new_dir);
Christoph Hellwig907f4552010-03-03 09:05:06 -05002389
Linus Torvalds1da177e2005-04-16 15:20:36 -07002390 old_bh = new_bh = dir_bh = NULL;
2391
2392 /* Initialize quotas before so that eventual writes go
2393 * in separate transaction */
2394 if (new_dentry->d_inode)
Christoph Hellwig871a2932010-03-03 09:05:07 -05002395 dquot_initialize(new_dentry->d_inode);
Jan Kara1f545872005-06-23 22:01:04 -07002396 handle = ext3_journal_start(old_dir, 2 *
2397 EXT3_DATA_TRANS_BLOCKS(old_dir->i_sb) +
Dave Kleikampe9ad5622006-09-27 01:49:35 -07002398 EXT3_INDEX_EXTRA_TRANS_BLOCKS + 2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002399 if (IS_ERR(handle))
2400 return PTR_ERR(handle);
2401
2402 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
2403 handle->h_sync = 1;
2404
Al Viro734711a2008-08-24 07:26:48 -04002405 old_bh = ext3_find_entry(old_dir, &old_dentry->d_name, &old_de);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002406 /*
2407 * Check for inode number is _not_ due to possible IO errors.
2408 * We might rmdir the source, keep it as pwd of some process
2409 * and merrily kill the link to whatever was created under the
2410 * same name. Goodbye sticky bit ;-<
2411 */
2412 old_inode = old_dentry->d_inode;
2413 retval = -ENOENT;
2414 if (!old_bh || le32_to_cpu(old_de->inode) != old_inode->i_ino)
2415 goto end_rename;
2416
2417 new_inode = new_dentry->d_inode;
Al Viro734711a2008-08-24 07:26:48 -04002418 new_bh = ext3_find_entry(new_dir, &new_dentry->d_name, &new_de);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002419 if (new_bh) {
2420 if (!new_inode) {
2421 brelse (new_bh);
2422 new_bh = NULL;
2423 }
2424 }
2425 if (S_ISDIR(old_inode->i_mode)) {
2426 if (new_inode) {
2427 retval = -ENOTEMPTY;
2428 if (!empty_dir (new_inode))
2429 goto end_rename;
2430 }
2431 retval = -EIO;
Carlos Maiolinoc3d59ad2012-10-02 23:59:23 -03002432 dir_bh = ext3_dir_bread(handle, old_inode, 0, 0, &retval);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002433 if (!dir_bh)
2434 goto end_rename;
2435 if (le32_to_cpu(PARENT_INO(dir_bh->b_data)) != old_dir->i_ino)
2436 goto end_rename;
2437 retval = -EMLINK;
2438 if (!new_inode && new_dir!=old_dir &&
2439 new_dir->i_nlink >= EXT3_LINK_MAX)
2440 goto end_rename;
2441 }
2442 if (!new_bh) {
2443 retval = ext3_add_entry (handle, new_dentry, old_inode);
2444 if (retval)
2445 goto end_rename;
2446 } else {
2447 BUFFER_TRACE(new_bh, "get write access");
Namhyung Kimad1857a2010-11-23 13:30:33 +09002448 retval = ext3_journal_get_write_access(handle, new_bh);
2449 if (retval)
2450 goto journal_error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002451 new_de->inode = cpu_to_le32(old_inode->i_ino);
2452 if (EXT3_HAS_INCOMPAT_FEATURE(new_dir->i_sb,
2453 EXT3_FEATURE_INCOMPAT_FILETYPE))
2454 new_de->file_type = old_de->file_type;
2455 new_dir->i_version++;
Jan Kara0b230762008-04-28 02:16:12 -07002456 new_dir->i_ctime = new_dir->i_mtime = CURRENT_TIME_SEC;
2457 ext3_mark_inode_dirty(handle, new_dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002458 BUFFER_TRACE(new_bh, "call ext3_journal_dirty_metadata");
Namhyung Kimad1857a2010-11-23 13:30:33 +09002459 retval = ext3_journal_dirty_metadata(handle, new_bh);
2460 if (retval)
2461 goto journal_error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002462 brelse(new_bh);
2463 new_bh = NULL;
2464 }
2465
2466 /*
2467 * Like most other Unix systems, set the ctime for inodes on a
2468 * rename.
2469 */
2470 old_inode->i_ctime = CURRENT_TIME_SEC;
2471 ext3_mark_inode_dirty(handle, old_inode);
2472
2473 /*
2474 * ok, that's it
2475 */
2476 if (le32_to_cpu(old_de->inode) != old_inode->i_ino ||
2477 old_de->name_len != old_dentry->d_name.len ||
2478 strncmp(old_de->name, old_dentry->d_name.name, old_de->name_len) ||
2479 (retval = ext3_delete_entry(handle, old_dir,
2480 old_de, old_bh)) == -ENOENT) {
2481 /* old_de could have moved from under us during htree split, so
2482 * make sure that we are deleting the right entry. We might
2483 * also be pointing to a stale entry in the unused part of
2484 * old_bh so just checking inum and the name isn't enough. */
2485 struct buffer_head *old_bh2;
2486 struct ext3_dir_entry_2 *old_de2;
2487
Al Viro734711a2008-08-24 07:26:48 -04002488 old_bh2 = ext3_find_entry(old_dir, &old_dentry->d_name,
2489 &old_de2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002490 if (old_bh2) {
2491 retval = ext3_delete_entry(handle, old_dir,
2492 old_de2, old_bh2);
2493 brelse(old_bh2);
2494 }
2495 }
2496 if (retval) {
2497 ext3_warning(old_dir->i_sb, "ext3_rename",
2498 "Deleting old file (%lu), %d, error=%d",
2499 old_dir->i_ino, old_dir->i_nlink, retval);
2500 }
2501
2502 if (new_inode) {
Dave Hansen9a53c3a2006-09-30 23:29:03 -07002503 drop_nlink(new_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002504 new_inode->i_ctime = CURRENT_TIME_SEC;
2505 }
2506 old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME_SEC;
2507 ext3_update_dx_flag(old_dir);
2508 if (dir_bh) {
2509 BUFFER_TRACE(dir_bh, "get_write_access");
Namhyung Kimad1857a2010-11-23 13:30:33 +09002510 retval = ext3_journal_get_write_access(handle, dir_bh);
2511 if (retval)
2512 goto journal_error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002513 PARENT_INO(dir_bh->b_data) = cpu_to_le32(new_dir->i_ino);
2514 BUFFER_TRACE(dir_bh, "call ext3_journal_dirty_metadata");
Namhyung Kimad1857a2010-11-23 13:30:33 +09002515 retval = ext3_journal_dirty_metadata(handle, dir_bh);
2516 if (retval) {
2517journal_error:
2518 ext3_std_error(new_dir->i_sb, retval);
2519 goto end_rename;
2520 }
Dave Hansen9a53c3a2006-09-30 23:29:03 -07002521 drop_nlink(old_dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002522 if (new_inode) {
Dave Hansen9a53c3a2006-09-30 23:29:03 -07002523 drop_nlink(new_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002524 } else {
Dave Hansend8c76e62006-09-30 23:29:04 -07002525 inc_nlink(new_dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002526 ext3_update_dx_flag(new_dir);
2527 ext3_mark_inode_dirty(handle, new_dir);
2528 }
2529 }
2530 ext3_mark_inode_dirty(handle, old_dir);
2531 if (new_inode) {
2532 ext3_mark_inode_dirty(handle, new_inode);
2533 if (!new_inode->i_nlink)
2534 ext3_orphan_add(handle, new_inode);
Theodore Ts'oe7c8f502009-04-03 01:34:49 -04002535 if (ext3_should_writeback_data(new_inode))
2536 flush_file = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002537 }
2538 retval = 0;
2539
2540end_rename:
2541 brelse (dir_bh);
2542 brelse (old_bh);
2543 brelse (new_bh);
2544 ext3_journal_stop(handle);
Theodore Ts'oe7c8f502009-04-03 01:34:49 -04002545 if (retval == 0 && flush_file)
2546 filemap_flush(old_inode->i_mapping);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002547 return retval;
2548}
2549
2550/*
2551 * directories can handle most operations...
2552 */
Arjan van de Ven754661f2007-02-12 00:55:38 -08002553const struct inode_operations ext3_dir_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002554 .create = ext3_create,
2555 .lookup = ext3_lookup,
2556 .link = ext3_link,
2557 .unlink = ext3_unlink,
2558 .symlink = ext3_symlink,
2559 .mkdir = ext3_mkdir,
2560 .rmdir = ext3_rmdir,
2561 .mknod = ext3_mknod,
Al Viroe6bbef92013-06-11 12:52:02 +04002562 .tmpfile = ext3_tmpfile,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002563 .rename = ext3_rename,
2564 .setattr = ext3_setattr,
2565#ifdef CONFIG_EXT3_FS_XATTR
2566 .setxattr = generic_setxattr,
2567 .getxattr = generic_getxattr,
2568 .listxattr = ext3_listxattr,
2569 .removexattr = generic_removexattr,
2570#endif
Christoph Hellwig4e34e712011-07-23 17:37:31 +02002571 .get_acl = ext3_get_acl,
Christoph Hellwig64e178a2013-12-20 05:16:44 -08002572 .set_acl = ext3_set_acl,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002573};
2574
Arjan van de Ven754661f2007-02-12 00:55:38 -08002575const struct inode_operations ext3_special_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002576 .setattr = ext3_setattr,
2577#ifdef CONFIG_EXT3_FS_XATTR
2578 .setxattr = generic_setxattr,
2579 .getxattr = generic_getxattr,
2580 .listxattr = ext3_listxattr,
2581 .removexattr = generic_removexattr,
2582#endif
Christoph Hellwig4e34e712011-07-23 17:37:31 +02002583 .get_acl = ext3_get_acl,
Christoph Hellwig64e178a2013-12-20 05:16:44 -08002584 .set_acl = ext3_set_acl,
Mingming Caoae6ddcc2006-09-27 01:49:27 -07002585};