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Commit | Line | Data |
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ac27a0ec | 1 | /* |
617ba13b | 2 | * linux/fs/ext4/namei.c |
ac27a0ec DK |
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 | |
18 | * for B-tree directories by Theodore Ts'o (tytso@mit.edu), 1998 | |
19 | * Hash Tree Directory indexing (c) | |
20 | * Daniel Phillips, 2001 | |
21 | * Hash Tree Directory indexing porting | |
22 | * Christopher Li, 2002 | |
23 | * Hash Tree Directory indexing cleanup | |
24 | * Theodore Ts'o, 2002 | |
25 | */ | |
26 | ||
27 | #include <linux/fs.h> | |
28 | #include <linux/pagemap.h> | |
dab291af | 29 | #include <linux/jbd2.h> |
ac27a0ec | 30 | #include <linux/time.h> |
ac27a0ec DK |
31 | #include <linux/fcntl.h> |
32 | #include <linux/stat.h> | |
33 | #include <linux/string.h> | |
34 | #include <linux/quotaops.h> | |
35 | #include <linux/buffer_head.h> | |
36 | #include <linux/bio.h> | |
3dcf5451 CH |
37 | #include "ext4.h" |
38 | #include "ext4_jbd2.h" | |
ac27a0ec DK |
39 | |
40 | #include "namei.h" | |
41 | #include "xattr.h" | |
42 | #include "acl.h" | |
43 | ||
44 | /* | |
45 | * define how far ahead to read directories while searching them. | |
46 | */ | |
47 | #define NAMEI_RA_CHUNKS 2 | |
48 | #define NAMEI_RA_BLOCKS 4 | |
8c55e204 | 49 | #define NAMEI_RA_SIZE (NAMEI_RA_CHUNKS * NAMEI_RA_BLOCKS) |
ac27a0ec DK |
50 | #define NAMEI_RA_INDEX(c,b) (((c) * NAMEI_RA_BLOCKS) + (b)) |
51 | ||
617ba13b | 52 | static struct buffer_head *ext4_append(handle_t *handle, |
ac27a0ec | 53 | struct inode *inode, |
725d26d3 | 54 | ext4_lblk_t *block, int *err) |
ac27a0ec DK |
55 | { |
56 | struct buffer_head *bh; | |
57 | ||
58 | *block = inode->i_size >> inode->i_sb->s_blocksize_bits; | |
59 | ||
a871611b AM |
60 | bh = ext4_bread(handle, inode, *block, 1, err); |
61 | if (bh) { | |
ac27a0ec | 62 | inode->i_size += inode->i_sb->s_blocksize; |
617ba13b | 63 | EXT4_I(inode)->i_disksize = inode->i_size; |
a871611b AM |
64 | *err = ext4_journal_get_write_access(handle, bh); |
65 | if (*err) { | |
66 | brelse(bh); | |
67 | bh = NULL; | |
68 | } | |
ac27a0ec DK |
69 | } |
70 | return bh; | |
71 | } | |
72 | ||
73 | #ifndef assert | |
74 | #define assert(test) J_ASSERT(test) | |
75 | #endif | |
76 | ||
77 | #ifndef swap | |
78 | #define swap(x, y) do { typeof(x) z = x; x = y; y = z; } while (0) | |
79 | #endif | |
80 | ||
81 | #ifdef DX_DEBUG | |
82 | #define dxtrace(command) command | |
83 | #else | |
84 | #define dxtrace(command) | |
85 | #endif | |
86 | ||
87 | struct fake_dirent | |
88 | { | |
89 | __le32 inode; | |
90 | __le16 rec_len; | |
91 | u8 name_len; | |
92 | u8 file_type; | |
93 | }; | |
94 | ||
95 | struct dx_countlimit | |
96 | { | |
97 | __le16 limit; | |
98 | __le16 count; | |
99 | }; | |
100 | ||
101 | struct dx_entry | |
102 | { | |
103 | __le32 hash; | |
104 | __le32 block; | |
105 | }; | |
106 | ||
107 | /* | |
108 | * dx_root_info is laid out so that if it should somehow get overlaid by a | |
109 | * dirent the two low bits of the hash version will be zero. Therefore, the | |
110 | * hash version mod 4 should never be 0. Sincerely, the paranoia department. | |
111 | */ | |
112 | ||
113 | struct dx_root | |
114 | { | |
115 | struct fake_dirent dot; | |
116 | char dot_name[4]; | |
117 | struct fake_dirent dotdot; | |
118 | char dotdot_name[4]; | |
119 | struct dx_root_info | |
120 | { | |
121 | __le32 reserved_zero; | |
122 | u8 hash_version; | |
123 | u8 info_length; /* 8 */ | |
124 | u8 indirect_levels; | |
125 | u8 unused_flags; | |
126 | } | |
127 | info; | |
128 | struct dx_entry entries[0]; | |
129 | }; | |
130 | ||
131 | struct dx_node | |
132 | { | |
133 | struct fake_dirent fake; | |
134 | struct dx_entry entries[0]; | |
135 | }; | |
136 | ||
137 | ||
138 | struct dx_frame | |
139 | { | |
140 | struct buffer_head *bh; | |
141 | struct dx_entry *entries; | |
142 | struct dx_entry *at; | |
143 | }; | |
144 | ||
145 | struct dx_map_entry | |
146 | { | |
147 | u32 hash; | |
ef2b02d3 ES |
148 | u16 offs; |
149 | u16 size; | |
ac27a0ec DK |
150 | }; |
151 | ||
725d26d3 AK |
152 | static inline ext4_lblk_t dx_get_block(struct dx_entry *entry); |
153 | static void dx_set_block(struct dx_entry *entry, ext4_lblk_t value); | |
af5bc92d TT |
154 | static inline unsigned dx_get_hash(struct dx_entry *entry); |
155 | static void dx_set_hash(struct dx_entry *entry, unsigned value); | |
156 | static unsigned dx_get_count(struct dx_entry *entries); | |
157 | static unsigned dx_get_limit(struct dx_entry *entries); | |
158 | static void dx_set_count(struct dx_entry *entries, unsigned value); | |
159 | static void dx_set_limit(struct dx_entry *entries, unsigned value); | |
160 | static unsigned dx_root_limit(struct inode *dir, unsigned infosize); | |
161 | static unsigned dx_node_limit(struct inode *dir); | |
f702ba0f | 162 | static struct dx_frame *dx_probe(const struct qstr *d_name, |
ac27a0ec DK |
163 | struct inode *dir, |
164 | struct dx_hash_info *hinfo, | |
165 | struct dx_frame *frame, | |
166 | int *err); | |
af5bc92d TT |
167 | static void dx_release(struct dx_frame *frames); |
168 | static int dx_make_map(struct ext4_dir_entry_2 *de, int size, | |
169 | struct dx_hash_info *hinfo, struct dx_map_entry map[]); | |
ac27a0ec | 170 | static void dx_sort_map(struct dx_map_entry *map, unsigned count); |
af5bc92d | 171 | static struct ext4_dir_entry_2 *dx_move_dirents(char *from, char *to, |
ac27a0ec | 172 | struct dx_map_entry *offsets, int count); |
af5bc92d | 173 | static struct ext4_dir_entry_2* dx_pack_dirents(char *base, int size); |
725d26d3 AK |
174 | static void dx_insert_block(struct dx_frame *frame, |
175 | u32 hash, ext4_lblk_t block); | |
617ba13b | 176 | static int ext4_htree_next_block(struct inode *dir, __u32 hash, |
ac27a0ec DK |
177 | struct dx_frame *frame, |
178 | struct dx_frame *frames, | |
179 | __u32 *start_hash); | |
f702ba0f TT |
180 | static struct buffer_head * ext4_dx_find_entry(struct inode *dir, |
181 | const struct qstr *d_name, | |
182 | struct ext4_dir_entry_2 **res_dir, | |
183 | int *err); | |
617ba13b | 184 | static int ext4_dx_add_entry(handle_t *handle, struct dentry *dentry, |
ac27a0ec DK |
185 | struct inode *inode); |
186 | ||
f795e140 LZ |
187 | /* |
188 | * p is at least 6 bytes before the end of page | |
189 | */ | |
190 | static inline struct ext4_dir_entry_2 * | |
191 | ext4_next_entry(struct ext4_dir_entry_2 *p) | |
192 | { | |
193 | return (struct ext4_dir_entry_2 *)((char *)p + | |
194 | ext4_rec_len_from_disk(p->rec_len)); | |
195 | } | |
196 | ||
ac27a0ec DK |
197 | /* |
198 | * Future: use high four bits of block for coalesce-on-delete flags | |
199 | * Mask them off for now. | |
200 | */ | |
201 | ||
725d26d3 | 202 | static inline ext4_lblk_t dx_get_block(struct dx_entry *entry) |
ac27a0ec DK |
203 | { |
204 | return le32_to_cpu(entry->block) & 0x00ffffff; | |
205 | } | |
206 | ||
725d26d3 | 207 | static inline void dx_set_block(struct dx_entry *entry, ext4_lblk_t value) |
ac27a0ec DK |
208 | { |
209 | entry->block = cpu_to_le32(value); | |
210 | } | |
211 | ||
af5bc92d | 212 | static inline unsigned dx_get_hash(struct dx_entry *entry) |
ac27a0ec DK |
213 | { |
214 | return le32_to_cpu(entry->hash); | |
215 | } | |
216 | ||
af5bc92d | 217 | static inline void dx_set_hash(struct dx_entry *entry, unsigned value) |
ac27a0ec DK |
218 | { |
219 | entry->hash = cpu_to_le32(value); | |
220 | } | |
221 | ||
af5bc92d | 222 | static inline unsigned dx_get_count(struct dx_entry *entries) |
ac27a0ec DK |
223 | { |
224 | return le16_to_cpu(((struct dx_countlimit *) entries)->count); | |
225 | } | |
226 | ||
af5bc92d | 227 | static inline unsigned dx_get_limit(struct dx_entry *entries) |
ac27a0ec DK |
228 | { |
229 | return le16_to_cpu(((struct dx_countlimit *) entries)->limit); | |
230 | } | |
231 | ||
af5bc92d | 232 | static inline void dx_set_count(struct dx_entry *entries, unsigned value) |
ac27a0ec DK |
233 | { |
234 | ((struct dx_countlimit *) entries)->count = cpu_to_le16(value); | |
235 | } | |
236 | ||
af5bc92d | 237 | static inline void dx_set_limit(struct dx_entry *entries, unsigned value) |
ac27a0ec DK |
238 | { |
239 | ((struct dx_countlimit *) entries)->limit = cpu_to_le16(value); | |
240 | } | |
241 | ||
af5bc92d | 242 | static inline unsigned dx_root_limit(struct inode *dir, unsigned infosize) |
ac27a0ec | 243 | { |
617ba13b MC |
244 | unsigned entry_space = dir->i_sb->s_blocksize - EXT4_DIR_REC_LEN(1) - |
245 | EXT4_DIR_REC_LEN(2) - infosize; | |
d9c769b7 | 246 | return entry_space / sizeof(struct dx_entry); |
ac27a0ec DK |
247 | } |
248 | ||
af5bc92d | 249 | static inline unsigned dx_node_limit(struct inode *dir) |
ac27a0ec | 250 | { |
617ba13b | 251 | unsigned entry_space = dir->i_sb->s_blocksize - EXT4_DIR_REC_LEN(0); |
d9c769b7 | 252 | return entry_space / sizeof(struct dx_entry); |
ac27a0ec DK |
253 | } |
254 | ||
255 | /* | |
256 | * Debug | |
257 | */ | |
258 | #ifdef DX_DEBUG | |
4776004f | 259 | static void dx_show_index(char * label, struct dx_entry *entries) |
ac27a0ec | 260 | { |
63f57933 | 261 | int i, n = dx_get_count (entries); |
4776004f | 262 | printk(KERN_DEBUG "%s index ", label); |
63f57933 | 263 | for (i = 0; i < n; i++) { |
4776004f | 264 | printk("%x->%lu ", i ? dx_get_hash(entries + i) : |
725d26d3 | 265 | 0, (unsigned long)dx_get_block(entries + i)); |
63f57933 AM |
266 | } |
267 | printk("\n"); | |
ac27a0ec DK |
268 | } |
269 | ||
270 | struct stats | |
271 | { | |
272 | unsigned names; | |
273 | unsigned space; | |
274 | unsigned bcount; | |
275 | }; | |
276 | ||
617ba13b | 277 | static struct stats dx_show_leaf(struct dx_hash_info *hinfo, struct ext4_dir_entry_2 *de, |
ac27a0ec DK |
278 | int size, int show_names) |
279 | { | |
280 | unsigned names = 0, space = 0; | |
281 | char *base = (char *) de; | |
282 | struct dx_hash_info h = *hinfo; | |
283 | ||
284 | printk("names: "); | |
285 | while ((char *) de < base + size) | |
286 | { | |
287 | if (de->inode) | |
288 | { | |
289 | if (show_names) | |
290 | { | |
291 | int len = de->name_len; | |
292 | char *name = de->name; | |
293 | while (len--) printk("%c", *name++); | |
617ba13b | 294 | ext4fs_dirhash(de->name, de->name_len, &h); |
ac27a0ec DK |
295 | printk(":%x.%u ", h.hash, |
296 | ((char *) de - base)); | |
297 | } | |
617ba13b | 298 | space += EXT4_DIR_REC_LEN(de->name_len); |
ac27a0ec DK |
299 | names++; |
300 | } | |
a72d7f83 | 301 | de = ext4_next_entry(de); |
ac27a0ec DK |
302 | } |
303 | printk("(%i)\n", names); | |
304 | return (struct stats) { names, space, 1 }; | |
305 | } | |
306 | ||
307 | struct stats dx_show_entries(struct dx_hash_info *hinfo, struct inode *dir, | |
308 | struct dx_entry *entries, int levels) | |
309 | { | |
310 | unsigned blocksize = dir->i_sb->s_blocksize; | |
af5bc92d | 311 | unsigned count = dx_get_count(entries), names = 0, space = 0, i; |
ac27a0ec DK |
312 | unsigned bcount = 0; |
313 | struct buffer_head *bh; | |
314 | int err; | |
315 | printk("%i indexed blocks...\n", count); | |
316 | for (i = 0; i < count; i++, entries++) | |
317 | { | |
725d26d3 AK |
318 | ext4_lblk_t block = dx_get_block(entries); |
319 | ext4_lblk_t hash = i ? dx_get_hash(entries): 0; | |
ac27a0ec DK |
320 | u32 range = i < count - 1? (dx_get_hash(entries + 1) - hash): ~hash; |
321 | struct stats stats; | |
322 | printk("%s%3u:%03u hash %8x/%8x ",levels?"":" ", i, block, hash, range); | |
617ba13b | 323 | if (!(bh = ext4_bread (NULL,dir, block, 0,&err))) continue; |
ac27a0ec DK |
324 | stats = levels? |
325 | dx_show_entries(hinfo, dir, ((struct dx_node *) bh->b_data)->entries, levels - 1): | |
617ba13b | 326 | dx_show_leaf(hinfo, (struct ext4_dir_entry_2 *) bh->b_data, blocksize, 0); |
ac27a0ec DK |
327 | names += stats.names; |
328 | space += stats.space; | |
329 | bcount += stats.bcount; | |
af5bc92d | 330 | brelse(bh); |
ac27a0ec DK |
331 | } |
332 | if (bcount) | |
4776004f TT |
333 | printk(KERN_DEBUG "%snames %u, fullness %u (%u%%)\n", |
334 | levels ? "" : " ", names, space/bcount, | |
335 | (space/bcount)*100/blocksize); | |
ac27a0ec DK |
336 | return (struct stats) { names, space, bcount}; |
337 | } | |
338 | #endif /* DX_DEBUG */ | |
339 | ||
340 | /* | |
341 | * Probe for a directory leaf block to search. | |
342 | * | |
343 | * dx_probe can return ERR_BAD_DX_DIR, which means there was a format | |
344 | * error in the directory index, and the caller should fall back to | |
345 | * searching the directory normally. The callers of dx_probe **MUST** | |
346 | * check for this error code, and make sure it never gets reflected | |
347 | * back to userspace. | |
348 | */ | |
349 | static struct dx_frame * | |
f702ba0f | 350 | dx_probe(const struct qstr *d_name, struct inode *dir, |
ac27a0ec DK |
351 | struct dx_hash_info *hinfo, struct dx_frame *frame_in, int *err) |
352 | { | |
353 | unsigned count, indirect; | |
354 | struct dx_entry *at, *entries, *p, *q, *m; | |
355 | struct dx_root *root; | |
356 | struct buffer_head *bh; | |
357 | struct dx_frame *frame = frame_in; | |
358 | u32 hash; | |
359 | ||
360 | frame->bh = NULL; | |
617ba13b | 361 | if (!(bh = ext4_bread (NULL,dir, 0, 0, err))) |
ac27a0ec DK |
362 | goto fail; |
363 | root = (struct dx_root *) bh->b_data; | |
364 | if (root->info.hash_version != DX_HASH_TEA && | |
365 | root->info.hash_version != DX_HASH_HALF_MD4 && | |
366 | root->info.hash_version != DX_HASH_LEGACY) { | |
46e665e9 | 367 | ext4_warning(dir->i_sb, __func__, |
ac27a0ec DK |
368 | "Unrecognised inode hash code %d", |
369 | root->info.hash_version); | |
370 | brelse(bh); | |
371 | *err = ERR_BAD_DX_DIR; | |
372 | goto fail; | |
373 | } | |
374 | hinfo->hash_version = root->info.hash_version; | |
f99b2589 TT |
375 | if (hinfo->hash_version <= DX_HASH_TEA) |
376 | hinfo->hash_version += EXT4_SB(dir->i_sb)->s_hash_unsigned; | |
617ba13b | 377 | hinfo->seed = EXT4_SB(dir->i_sb)->s_hash_seed; |
f702ba0f TT |
378 | if (d_name) |
379 | ext4fs_dirhash(d_name->name, d_name->len, hinfo); | |
ac27a0ec DK |
380 | hash = hinfo->hash; |
381 | ||
382 | if (root->info.unused_flags & 1) { | |
46e665e9 | 383 | ext4_warning(dir->i_sb, __func__, |
ac27a0ec DK |
384 | "Unimplemented inode hash flags: %#06x", |
385 | root->info.unused_flags); | |
386 | brelse(bh); | |
387 | *err = ERR_BAD_DX_DIR; | |
388 | goto fail; | |
389 | } | |
390 | ||
391 | if ((indirect = root->info.indirect_levels) > 1) { | |
46e665e9 | 392 | ext4_warning(dir->i_sb, __func__, |
ac27a0ec DK |
393 | "Unimplemented inode hash depth: %#06x", |
394 | root->info.indirect_levels); | |
395 | brelse(bh); | |
396 | *err = ERR_BAD_DX_DIR; | |
397 | goto fail; | |
398 | } | |
399 | ||
400 | entries = (struct dx_entry *) (((char *)&root->info) + | |
401 | root->info.info_length); | |
3d82abae ES |
402 | |
403 | if (dx_get_limit(entries) != dx_root_limit(dir, | |
404 | root->info.info_length)) { | |
46e665e9 | 405 | ext4_warning(dir->i_sb, __func__, |
3d82abae ES |
406 | "dx entry: limit != root limit"); |
407 | brelse(bh); | |
408 | *err = ERR_BAD_DX_DIR; | |
409 | goto fail; | |
410 | } | |
411 | ||
af5bc92d | 412 | dxtrace(printk("Look up %x", hash)); |
ac27a0ec DK |
413 | while (1) |
414 | { | |
415 | count = dx_get_count(entries); | |
3d82abae | 416 | if (!count || count > dx_get_limit(entries)) { |
46e665e9 | 417 | ext4_warning(dir->i_sb, __func__, |
3d82abae ES |
418 | "dx entry: no count or count > limit"); |
419 | brelse(bh); | |
420 | *err = ERR_BAD_DX_DIR; | |
421 | goto fail2; | |
422 | } | |
423 | ||
ac27a0ec DK |
424 | p = entries + 1; |
425 | q = entries + count - 1; | |
426 | while (p <= q) | |
427 | { | |
428 | m = p + (q - p)/2; | |
429 | dxtrace(printk(".")); | |
430 | if (dx_get_hash(m) > hash) | |
431 | q = m - 1; | |
432 | else | |
433 | p = m + 1; | |
434 | } | |
435 | ||
436 | if (0) // linear search cross check | |
437 | { | |
438 | unsigned n = count - 1; | |
439 | at = entries; | |
440 | while (n--) | |
441 | { | |
442 | dxtrace(printk(",")); | |
443 | if (dx_get_hash(++at) > hash) | |
444 | { | |
445 | at--; | |
446 | break; | |
447 | } | |
448 | } | |
449 | assert (at == p - 1); | |
450 | } | |
451 | ||
452 | at = p - 1; | |
453 | dxtrace(printk(" %x->%u\n", at == entries? 0: dx_get_hash(at), dx_get_block(at))); | |
454 | frame->bh = bh; | |
455 | frame->entries = entries; | |
456 | frame->at = at; | |
457 | if (!indirect--) return frame; | |
617ba13b | 458 | if (!(bh = ext4_bread (NULL,dir, dx_get_block(at), 0, err))) |
ac27a0ec DK |
459 | goto fail2; |
460 | at = entries = ((struct dx_node *) bh->b_data)->entries; | |
3d82abae | 461 | if (dx_get_limit(entries) != dx_node_limit (dir)) { |
46e665e9 | 462 | ext4_warning(dir->i_sb, __func__, |
3d82abae ES |
463 | "dx entry: limit != node limit"); |
464 | brelse(bh); | |
465 | *err = ERR_BAD_DX_DIR; | |
466 | goto fail2; | |
467 | } | |
ac27a0ec | 468 | frame++; |
3d82abae | 469 | frame->bh = NULL; |
ac27a0ec DK |
470 | } |
471 | fail2: | |
472 | while (frame >= frame_in) { | |
473 | brelse(frame->bh); | |
474 | frame--; | |
475 | } | |
476 | fail: | |
3d82abae | 477 | if (*err == ERR_BAD_DX_DIR) |
46e665e9 | 478 | ext4_warning(dir->i_sb, __func__, |
3d82abae ES |
479 | "Corrupt dir inode %ld, running e2fsck is " |
480 | "recommended.", dir->i_ino); | |
ac27a0ec DK |
481 | return NULL; |
482 | } | |
483 | ||
484 | static void dx_release (struct dx_frame *frames) | |
485 | { | |
486 | if (frames[0].bh == NULL) | |
487 | return; | |
488 | ||
489 | if (((struct dx_root *) frames[0].bh->b_data)->info.indirect_levels) | |
490 | brelse(frames[1].bh); | |
491 | brelse(frames[0].bh); | |
492 | } | |
493 | ||
494 | /* | |
495 | * This function increments the frame pointer to search the next leaf | |
496 | * block, and reads in the necessary intervening nodes if the search | |
497 | * should be necessary. Whether or not the search is necessary is | |
498 | * controlled by the hash parameter. If the hash value is even, then | |
499 | * the search is only continued if the next block starts with that | |
500 | * hash value. This is used if we are searching for a specific file. | |
501 | * | |
502 | * If the hash value is HASH_NB_ALWAYS, then always go to the next block. | |
503 | * | |
504 | * This function returns 1 if the caller should continue to search, | |
505 | * or 0 if it should not. If there is an error reading one of the | |
506 | * index blocks, it will a negative error code. | |
507 | * | |
508 | * If start_hash is non-null, it will be filled in with the starting | |
509 | * hash of the next page. | |
510 | */ | |
617ba13b | 511 | static int ext4_htree_next_block(struct inode *dir, __u32 hash, |
ac27a0ec DK |
512 | struct dx_frame *frame, |
513 | struct dx_frame *frames, | |
514 | __u32 *start_hash) | |
515 | { | |
516 | struct dx_frame *p; | |
517 | struct buffer_head *bh; | |
518 | int err, num_frames = 0; | |
519 | __u32 bhash; | |
520 | ||
521 | p = frame; | |
522 | /* | |
523 | * Find the next leaf page by incrementing the frame pointer. | |
524 | * If we run out of entries in the interior node, loop around and | |
525 | * increment pointer in the parent node. When we break out of | |
526 | * this loop, num_frames indicates the number of interior | |
527 | * nodes need to be read. | |
528 | */ | |
529 | while (1) { | |
530 | if (++(p->at) < p->entries + dx_get_count(p->entries)) | |
531 | break; | |
532 | if (p == frames) | |
533 | return 0; | |
534 | num_frames++; | |
535 | p--; | |
536 | } | |
537 | ||
538 | /* | |
539 | * If the hash is 1, then continue only if the next page has a | |
540 | * continuation hash of any value. This is used for readdir | |
541 | * handling. Otherwise, check to see if the hash matches the | |
542 | * desired contiuation hash. If it doesn't, return since | |
543 | * there's no point to read in the successive index pages. | |
544 | */ | |
545 | bhash = dx_get_hash(p->at); | |
546 | if (start_hash) | |
547 | *start_hash = bhash; | |
548 | if ((hash & 1) == 0) { | |
549 | if ((bhash & ~1) != hash) | |
550 | return 0; | |
551 | } | |
552 | /* | |
553 | * If the hash is HASH_NB_ALWAYS, we always go to the next | |
554 | * block so no check is necessary | |
555 | */ | |
556 | while (num_frames--) { | |
617ba13b | 557 | if (!(bh = ext4_bread(NULL, dir, dx_get_block(p->at), |
ac27a0ec DK |
558 | 0, &err))) |
559 | return err; /* Failure */ | |
560 | p++; | |
af5bc92d | 561 | brelse(p->bh); |
ac27a0ec DK |
562 | p->bh = bh; |
563 | p->at = p->entries = ((struct dx_node *) bh->b_data)->entries; | |
564 | } | |
565 | return 1; | |
566 | } | |
567 | ||
568 | ||
ac27a0ec DK |
569 | /* |
570 | * This function fills a red-black tree with information from a | |
571 | * directory block. It returns the number directory entries loaded | |
572 | * into the tree. If there is an error it is returned in err. | |
573 | */ | |
574 | static int htree_dirblock_to_tree(struct file *dir_file, | |
725d26d3 | 575 | struct inode *dir, ext4_lblk_t block, |
ac27a0ec DK |
576 | struct dx_hash_info *hinfo, |
577 | __u32 start_hash, __u32 start_minor_hash) | |
578 | { | |
579 | struct buffer_head *bh; | |
617ba13b | 580 | struct ext4_dir_entry_2 *de, *top; |
ac27a0ec DK |
581 | int err, count = 0; |
582 | ||
725d26d3 AK |
583 | dxtrace(printk(KERN_INFO "In htree dirblock_to_tree: block %lu\n", |
584 | (unsigned long)block)); | |
617ba13b | 585 | if (!(bh = ext4_bread (NULL, dir, block, 0, &err))) |
ac27a0ec DK |
586 | return err; |
587 | ||
617ba13b MC |
588 | de = (struct ext4_dir_entry_2 *) bh->b_data; |
589 | top = (struct ext4_dir_entry_2 *) ((char *) de + | |
ac27a0ec | 590 | dir->i_sb->s_blocksize - |
617ba13b MC |
591 | EXT4_DIR_REC_LEN(0)); |
592 | for (; de < top; de = ext4_next_entry(de)) { | |
e6c40211 ES |
593 | if (!ext4_check_dir_entry("htree_dirblock_to_tree", dir, de, bh, |
594 | (block<<EXT4_BLOCK_SIZE_BITS(dir->i_sb)) | |
595 | +((char *)de - bh->b_data))) { | |
596 | /* On error, skip the f_pos to the next block. */ | |
597 | dir_file->f_pos = (dir_file->f_pos | | |
598 | (dir->i_sb->s_blocksize - 1)) + 1; | |
af5bc92d | 599 | brelse(bh); |
e6c40211 ES |
600 | return count; |
601 | } | |
617ba13b | 602 | ext4fs_dirhash(de->name, de->name_len, hinfo); |
ac27a0ec DK |
603 | if ((hinfo->hash < start_hash) || |
604 | ((hinfo->hash == start_hash) && | |
605 | (hinfo->minor_hash < start_minor_hash))) | |
606 | continue; | |
607 | if (de->inode == 0) | |
608 | continue; | |
617ba13b | 609 | if ((err = ext4_htree_store_dirent(dir_file, |
ac27a0ec DK |
610 | hinfo->hash, hinfo->minor_hash, de)) != 0) { |
611 | brelse(bh); | |
612 | return err; | |
613 | } | |
614 | count++; | |
615 | } | |
616 | brelse(bh); | |
617 | return count; | |
618 | } | |
619 | ||
620 | ||
621 | /* | |
622 | * This function fills a red-black tree with information from a | |
623 | * directory. We start scanning the directory in hash order, starting | |
624 | * at start_hash and start_minor_hash. | |
625 | * | |
626 | * This function returns the number of entries inserted into the tree, | |
627 | * or a negative error code. | |
628 | */ | |
617ba13b | 629 | int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, |
ac27a0ec DK |
630 | __u32 start_minor_hash, __u32 *next_hash) |
631 | { | |
632 | struct dx_hash_info hinfo; | |
617ba13b | 633 | struct ext4_dir_entry_2 *de; |
ac27a0ec DK |
634 | struct dx_frame frames[2], *frame; |
635 | struct inode *dir; | |
725d26d3 | 636 | ext4_lblk_t block; |
ac27a0ec | 637 | int count = 0; |
725d26d3 | 638 | int ret, err; |
ac27a0ec DK |
639 | __u32 hashval; |
640 | ||
4776004f TT |
641 | dxtrace(printk(KERN_DEBUG "In htree_fill_tree, start hash: %x:%x\n", |
642 | start_hash, start_minor_hash)); | |
9d549890 | 643 | dir = dir_file->f_path.dentry->d_inode; |
617ba13b MC |
644 | if (!(EXT4_I(dir)->i_flags & EXT4_INDEX_FL)) { |
645 | hinfo.hash_version = EXT4_SB(dir->i_sb)->s_def_hash_version; | |
f99b2589 TT |
646 | if (hinfo.hash_version <= DX_HASH_TEA) |
647 | hinfo.hash_version += | |
648 | EXT4_SB(dir->i_sb)->s_hash_unsigned; | |
617ba13b | 649 | hinfo.seed = EXT4_SB(dir->i_sb)->s_hash_seed; |
ac27a0ec DK |
650 | count = htree_dirblock_to_tree(dir_file, dir, 0, &hinfo, |
651 | start_hash, start_minor_hash); | |
652 | *next_hash = ~0; | |
653 | return count; | |
654 | } | |
655 | hinfo.hash = start_hash; | |
656 | hinfo.minor_hash = 0; | |
f702ba0f | 657 | frame = dx_probe(NULL, dir, &hinfo, frames, &err); |
ac27a0ec DK |
658 | if (!frame) |
659 | return err; | |
660 | ||
661 | /* Add '.' and '..' from the htree header */ | |
662 | if (!start_hash && !start_minor_hash) { | |
617ba13b MC |
663 | de = (struct ext4_dir_entry_2 *) frames[0].bh->b_data; |
664 | if ((err = ext4_htree_store_dirent(dir_file, 0, 0, de)) != 0) | |
ac27a0ec DK |
665 | goto errout; |
666 | count++; | |
667 | } | |
668 | if (start_hash < 2 || (start_hash ==2 && start_minor_hash==0)) { | |
617ba13b MC |
669 | de = (struct ext4_dir_entry_2 *) frames[0].bh->b_data; |
670 | de = ext4_next_entry(de); | |
671 | if ((err = ext4_htree_store_dirent(dir_file, 2, 0, de)) != 0) | |
ac27a0ec DK |
672 | goto errout; |
673 | count++; | |
674 | } | |
675 | ||
676 | while (1) { | |
677 | block = dx_get_block(frame->at); | |
678 | ret = htree_dirblock_to_tree(dir_file, dir, block, &hinfo, | |
679 | start_hash, start_minor_hash); | |
680 | if (ret < 0) { | |
681 | err = ret; | |
682 | goto errout; | |
683 | } | |
684 | count += ret; | |
685 | hashval = ~0; | |
617ba13b | 686 | ret = ext4_htree_next_block(dir, HASH_NB_ALWAYS, |
ac27a0ec DK |
687 | frame, frames, &hashval); |
688 | *next_hash = hashval; | |
689 | if (ret < 0) { | |
690 | err = ret; | |
691 | goto errout; | |
692 | } | |
693 | /* | |
694 | * Stop if: (a) there are no more entries, or | |
695 | * (b) we have inserted at least one entry and the | |
696 | * next hash value is not a continuation | |
697 | */ | |
698 | if ((ret == 0) || | |
699 | (count && ((hashval & 1) == 0))) | |
700 | break; | |
701 | } | |
702 | dx_release(frames); | |
4776004f TT |
703 | dxtrace(printk(KERN_DEBUG "Fill tree: returned %d entries, " |
704 | "next hash: %x\n", count, *next_hash)); | |
ac27a0ec DK |
705 | return count; |
706 | errout: | |
707 | dx_release(frames); | |
708 | return (err); | |
709 | } | |
710 | ||
711 | ||
712 | /* | |
713 | * Directory block splitting, compacting | |
714 | */ | |
715 | ||
ef2b02d3 ES |
716 | /* |
717 | * Create map of hash values, offsets, and sizes, stored at end of block. | |
718 | * Returns number of entries mapped. | |
719 | */ | |
617ba13b | 720 | static int dx_make_map (struct ext4_dir_entry_2 *de, int size, |
ac27a0ec DK |
721 | struct dx_hash_info *hinfo, struct dx_map_entry *map_tail) |
722 | { | |
723 | int count = 0; | |
724 | char *base = (char *) de; | |
725 | struct dx_hash_info h = *hinfo; | |
726 | ||
727 | while ((char *) de < base + size) | |
728 | { | |
729 | if (de->name_len && de->inode) { | |
617ba13b | 730 | ext4fs_dirhash(de->name, de->name_len, &h); |
ac27a0ec DK |
731 | map_tail--; |
732 | map_tail->hash = h.hash; | |
ef2b02d3 ES |
733 | map_tail->offs = (u16) ((char *) de - base); |
734 | map_tail->size = le16_to_cpu(de->rec_len); | |
ac27a0ec DK |
735 | count++; |
736 | cond_resched(); | |
737 | } | |
738 | /* XXX: do we need to check rec_len == 0 case? -Chris */ | |
a72d7f83 | 739 | de = ext4_next_entry(de); |
ac27a0ec DK |
740 | } |
741 | return count; | |
742 | } | |
743 | ||
ef2b02d3 | 744 | /* Sort map by hash value */ |
ac27a0ec DK |
745 | static void dx_sort_map (struct dx_map_entry *map, unsigned count) |
746 | { | |
63f57933 AM |
747 | struct dx_map_entry *p, *q, *top = map + count - 1; |
748 | int more; | |
749 | /* Combsort until bubble sort doesn't suck */ | |
750 | while (count > 2) { | |
751 | count = count*10/13; | |
752 | if (count - 9 < 2) /* 9, 10 -> 11 */ | |
753 | count = 11; | |
754 | for (p = top, q = p - count; q >= map; p--, q--) | |
755 | if (p->hash < q->hash) | |
756 | swap(*p, *q); | |
757 | } | |
758 | /* Garden variety bubble sort */ | |
759 | do { | |
760 | more = 0; | |
761 | q = top; | |
762 | while (q-- > map) { | |
763 | if (q[1].hash >= q[0].hash) | |
ac27a0ec | 764 | continue; |
63f57933 AM |
765 | swap(*(q+1), *q); |
766 | more = 1; | |
ac27a0ec DK |
767 | } |
768 | } while(more); | |
769 | } | |
770 | ||
725d26d3 | 771 | static void dx_insert_block(struct dx_frame *frame, u32 hash, ext4_lblk_t block) |
ac27a0ec DK |
772 | { |
773 | struct dx_entry *entries = frame->entries; | |
774 | struct dx_entry *old = frame->at, *new = old + 1; | |
775 | int count = dx_get_count(entries); | |
776 | ||
777 | assert(count < dx_get_limit(entries)); | |
778 | assert(old < entries + count); | |
779 | memmove(new + 1, new, (char *)(entries + count) - (char *)(new)); | |
780 | dx_set_hash(new, hash); | |
781 | dx_set_block(new, block); | |
782 | dx_set_count(entries, count + 1); | |
783 | } | |
ac27a0ec | 784 | |
617ba13b | 785 | static void ext4_update_dx_flag(struct inode *inode) |
ac27a0ec | 786 | { |
617ba13b MC |
787 | if (!EXT4_HAS_COMPAT_FEATURE(inode->i_sb, |
788 | EXT4_FEATURE_COMPAT_DIR_INDEX)) | |
789 | EXT4_I(inode)->i_flags &= ~EXT4_INDEX_FL; | |
ac27a0ec DK |
790 | } |
791 | ||
792 | /* | |
617ba13b | 793 | * NOTE! unlike strncmp, ext4_match returns 1 for success, 0 for failure. |
ac27a0ec | 794 | * |
617ba13b | 795 | * `len <= EXT4_NAME_LEN' is guaranteed by caller. |
ac27a0ec DK |
796 | * `de != NULL' is guaranteed by caller. |
797 | */ | |
617ba13b MC |
798 | static inline int ext4_match (int len, const char * const name, |
799 | struct ext4_dir_entry_2 * de) | |
ac27a0ec DK |
800 | { |
801 | if (len != de->name_len) | |
802 | return 0; | |
803 | if (!de->inode) | |
804 | return 0; | |
805 | return !memcmp(name, de->name, len); | |
806 | } | |
807 | ||
808 | /* | |
809 | * Returns 0 if not found, -1 on failure, and 1 on success | |
810 | */ | |
af5bc92d | 811 | static inline int search_dirblock(struct buffer_head *bh, |
ac27a0ec | 812 | struct inode *dir, |
f702ba0f | 813 | const struct qstr *d_name, |
ac27a0ec | 814 | unsigned long offset, |
617ba13b | 815 | struct ext4_dir_entry_2 ** res_dir) |
ac27a0ec | 816 | { |
617ba13b | 817 | struct ext4_dir_entry_2 * de; |
ac27a0ec DK |
818 | char * dlimit; |
819 | int de_len; | |
f702ba0f TT |
820 | const char *name = d_name->name; |
821 | int namelen = d_name->len; | |
ac27a0ec | 822 | |
617ba13b | 823 | de = (struct ext4_dir_entry_2 *) bh->b_data; |
ac27a0ec DK |
824 | dlimit = bh->b_data + dir->i_sb->s_blocksize; |
825 | while ((char *) de < dlimit) { | |
826 | /* this code is executed quadratically often */ | |
827 | /* do minimal checking `by hand' */ | |
828 | ||
829 | if ((char *) de + namelen <= dlimit && | |
617ba13b | 830 | ext4_match (namelen, name, de)) { |
ac27a0ec | 831 | /* found a match - just to be sure, do a full check */ |
617ba13b | 832 | if (!ext4_check_dir_entry("ext4_find_entry", |
ac27a0ec DK |
833 | dir, de, bh, offset)) |
834 | return -1; | |
835 | *res_dir = de; | |
836 | return 1; | |
837 | } | |
838 | /* prevent looping on a bad block */ | |
a72d7f83 | 839 | de_len = ext4_rec_len_from_disk(de->rec_len); |
ac27a0ec DK |
840 | if (de_len <= 0) |
841 | return -1; | |
842 | offset += de_len; | |
617ba13b | 843 | de = (struct ext4_dir_entry_2 *) ((char *) de + de_len); |
ac27a0ec DK |
844 | } |
845 | return 0; | |
846 | } | |
847 | ||
848 | ||
849 | /* | |
617ba13b | 850 | * ext4_find_entry() |
ac27a0ec DK |
851 | * |
852 | * finds an entry in the specified directory with the wanted name. It | |
853 | * returns the cache buffer in which the entry was found, and the entry | |
854 | * itself (as a parameter - res_dir). It does NOT read the inode of the | |
855 | * entry - you'll have to do that yourself if you want to. | |
856 | * | |
857 | * The returned buffer_head has ->b_count elevated. The caller is expected | |
858 | * to brelse() it when appropriate. | |
859 | */ | |
f702ba0f TT |
860 | static struct buffer_head * ext4_find_entry (struct inode *dir, |
861 | const struct qstr *d_name, | |
617ba13b | 862 | struct ext4_dir_entry_2 ** res_dir) |
ac27a0ec | 863 | { |
af5bc92d TT |
864 | struct super_block *sb; |
865 | struct buffer_head *bh_use[NAMEI_RA_SIZE]; | |
866 | struct buffer_head *bh, *ret = NULL; | |
725d26d3 | 867 | ext4_lblk_t start, block, b; |
ac27a0ec DK |
868 | int ra_max = 0; /* Number of bh's in the readahead |
869 | buffer, bh_use[] */ | |
870 | int ra_ptr = 0; /* Current index into readahead | |
871 | buffer */ | |
872 | int num = 0; | |
725d26d3 AK |
873 | ext4_lblk_t nblocks; |
874 | int i, err; | |
ac27a0ec | 875 | int namelen; |
ac27a0ec DK |
876 | |
877 | *res_dir = NULL; | |
878 | sb = dir->i_sb; | |
f702ba0f | 879 | namelen = d_name->len; |
617ba13b | 880 | if (namelen > EXT4_NAME_LEN) |
ac27a0ec | 881 | return NULL; |
ac27a0ec | 882 | if (is_dx(dir)) { |
f702ba0f | 883 | bh = ext4_dx_find_entry(dir, d_name, res_dir, &err); |
ac27a0ec DK |
884 | /* |
885 | * On success, or if the error was file not found, | |
886 | * return. Otherwise, fall back to doing a search the | |
887 | * old fashioned way. | |
888 | */ | |
889 | if (bh || (err != ERR_BAD_DX_DIR)) | |
890 | return bh; | |
4776004f TT |
891 | dxtrace(printk(KERN_DEBUG "ext4_find_entry: dx failed, " |
892 | "falling back\n")); | |
ac27a0ec | 893 | } |
617ba13b MC |
894 | nblocks = dir->i_size >> EXT4_BLOCK_SIZE_BITS(sb); |
895 | start = EXT4_I(dir)->i_dir_start_lookup; | |
ac27a0ec DK |
896 | if (start >= nblocks) |
897 | start = 0; | |
898 | block = start; | |
899 | restart: | |
900 | do { | |
901 | /* | |
902 | * We deal with the read-ahead logic here. | |
903 | */ | |
904 | if (ra_ptr >= ra_max) { | |
905 | /* Refill the readahead buffer */ | |
906 | ra_ptr = 0; | |
907 | b = block; | |
908 | for (ra_max = 0; ra_max < NAMEI_RA_SIZE; ra_max++) { | |
909 | /* | |
910 | * Terminate if we reach the end of the | |
911 | * directory and must wrap, or if our | |
912 | * search has finished at this block. | |
913 | */ | |
914 | if (b >= nblocks || (num && block == start)) { | |
915 | bh_use[ra_max] = NULL; | |
916 | break; | |
917 | } | |
918 | num++; | |
617ba13b | 919 | bh = ext4_getblk(NULL, dir, b++, 0, &err); |
ac27a0ec DK |
920 | bh_use[ra_max] = bh; |
921 | if (bh) | |
922 | ll_rw_block(READ_META, 1, &bh); | |
923 | } | |
924 | } | |
925 | if ((bh = bh_use[ra_ptr++]) == NULL) | |
926 | goto next; | |
927 | wait_on_buffer(bh); | |
928 | if (!buffer_uptodate(bh)) { | |
929 | /* read error, skip block & hope for the best */ | |
46e665e9 | 930 | ext4_error(sb, __func__, "reading directory #%lu " |
725d26d3 AK |
931 | "offset %lu", dir->i_ino, |
932 | (unsigned long)block); | |
ac27a0ec DK |
933 | brelse(bh); |
934 | goto next; | |
935 | } | |
f702ba0f | 936 | i = search_dirblock(bh, dir, d_name, |
617ba13b | 937 | block << EXT4_BLOCK_SIZE_BITS(sb), res_dir); |
ac27a0ec | 938 | if (i == 1) { |
617ba13b | 939 | EXT4_I(dir)->i_dir_start_lookup = block; |
ac27a0ec DK |
940 | ret = bh; |
941 | goto cleanup_and_exit; | |
942 | } else { | |
943 | brelse(bh); | |
944 | if (i < 0) | |
945 | goto cleanup_and_exit; | |
946 | } | |
947 | next: | |
948 | if (++block >= nblocks) | |
949 | block = 0; | |
950 | } while (block != start); | |
951 | ||
952 | /* | |
953 | * If the directory has grown while we were searching, then | |
954 | * search the last part of the directory before giving up. | |
955 | */ | |
956 | block = nblocks; | |
617ba13b | 957 | nblocks = dir->i_size >> EXT4_BLOCK_SIZE_BITS(sb); |
ac27a0ec DK |
958 | if (block < nblocks) { |
959 | start = 0; | |
960 | goto restart; | |
961 | } | |
962 | ||
963 | cleanup_and_exit: | |
964 | /* Clean up the read-ahead blocks */ | |
965 | for (; ra_ptr < ra_max; ra_ptr++) | |
af5bc92d | 966 | brelse(bh_use[ra_ptr]); |
ac27a0ec DK |
967 | return ret; |
968 | } | |
969 | ||
f702ba0f | 970 | static struct buffer_head * ext4_dx_find_entry(struct inode *dir, const struct qstr *d_name, |
617ba13b | 971 | struct ext4_dir_entry_2 **res_dir, int *err) |
ac27a0ec DK |
972 | { |
973 | struct super_block * sb; | |
974 | struct dx_hash_info hinfo; | |
975 | u32 hash; | |
976 | struct dx_frame frames[2], *frame; | |
617ba13b | 977 | struct ext4_dir_entry_2 *de, *top; |
ac27a0ec | 978 | struct buffer_head *bh; |
725d26d3 | 979 | ext4_lblk_t block; |
ac27a0ec | 980 | int retval; |
f702ba0f TT |
981 | int namelen = d_name->len; |
982 | const u8 *name = d_name->name; | |
ac27a0ec DK |
983 | |
984 | sb = dir->i_sb; | |
985 | /* NFS may look up ".." - look at dx_root directory block */ | |
986 | if (namelen > 2 || name[0] != '.'||(name[1] != '.' && name[1] != '\0')){ | |
f702ba0f | 987 | if (!(frame = dx_probe(d_name, dir, &hinfo, frames, err))) |
ac27a0ec DK |
988 | return NULL; |
989 | } else { | |
990 | frame = frames; | |
991 | frame->bh = NULL; /* for dx_release() */ | |
992 | frame->at = (struct dx_entry *)frames; /* hack for zero entry*/ | |
993 | dx_set_block(frame->at, 0); /* dx_root block is 0 */ | |
994 | } | |
995 | hash = hinfo.hash; | |
996 | do { | |
997 | block = dx_get_block(frame->at); | |
617ba13b | 998 | if (!(bh = ext4_bread (NULL,dir, block, 0, err))) |
ac27a0ec | 999 | goto errout; |
617ba13b MC |
1000 | de = (struct ext4_dir_entry_2 *) bh->b_data; |
1001 | top = (struct ext4_dir_entry_2 *) ((char *) de + sb->s_blocksize - | |
1002 | EXT4_DIR_REC_LEN(0)); | |
f3b35f06 DG |
1003 | for (; de < top; de = ext4_next_entry(de)) { |
1004 | int off = (block << EXT4_BLOCK_SIZE_BITS(sb)) | |
1005 | + ((char *) de - bh->b_data); | |
1006 | ||
1007 | if (!ext4_check_dir_entry(__func__, dir, de, bh, off)) { | |
1008 | brelse(bh); | |
fedee54d | 1009 | *err = ERR_BAD_DX_DIR; |
ac27a0ec DK |
1010 | goto errout; |
1011 | } | |
f3b35f06 DG |
1012 | |
1013 | if (ext4_match(namelen, name, de)) { | |
1014 | *res_dir = de; | |
1015 | dx_release(frames); | |
1016 | return bh; | |
1017 | } | |
ac27a0ec | 1018 | } |
af5bc92d | 1019 | brelse(bh); |
ac27a0ec | 1020 | /* Check to see if we should continue to search */ |
617ba13b | 1021 | retval = ext4_htree_next_block(dir, hash, frame, |
ac27a0ec DK |
1022 | frames, NULL); |
1023 | if (retval < 0) { | |
46e665e9 | 1024 | ext4_warning(sb, __func__, |
ac27a0ec DK |
1025 | "error reading index page in directory #%lu", |
1026 | dir->i_ino); | |
1027 | *err = retval; | |
1028 | goto errout; | |
1029 | } | |
1030 | } while (retval == 1); | |
1031 | ||
1032 | *err = -ENOENT; | |
1033 | errout: | |
4776004f | 1034 | dxtrace(printk(KERN_DEBUG "%s not found\n", name)); |
ac27a0ec DK |
1035 | dx_release (frames); |
1036 | return NULL; | |
1037 | } | |
ac27a0ec | 1038 | |
af5bc92d | 1039 | static struct dentry *ext4_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) |
ac27a0ec | 1040 | { |
af5bc92d TT |
1041 | struct inode *inode; |
1042 | struct ext4_dir_entry_2 *de; | |
1043 | struct buffer_head *bh; | |
ac27a0ec | 1044 | |
617ba13b | 1045 | if (dentry->d_name.len > EXT4_NAME_LEN) |
ac27a0ec DK |
1046 | return ERR_PTR(-ENAMETOOLONG); |
1047 | ||
f702ba0f | 1048 | bh = ext4_find_entry(dir, &dentry->d_name, &de); |
ac27a0ec DK |
1049 | inode = NULL; |
1050 | if (bh) { | |
1051 | unsigned long ino = le32_to_cpu(de->inode); | |
af5bc92d | 1052 | brelse(bh); |
617ba13b MC |
1053 | if (!ext4_valid_inum(dir->i_sb, ino)) { |
1054 | ext4_error(dir->i_sb, "ext4_lookup", | |
ac27a0ec | 1055 | "bad inode number: %lu", ino); |
1d1fe1ee | 1056 | return ERR_PTR(-EIO); |
a6c15c2b | 1057 | } |
1d1fe1ee DH |
1058 | inode = ext4_iget(dir->i_sb, ino); |
1059 | if (IS_ERR(inode)) | |
1060 | return ERR_CAST(inode); | |
ac27a0ec DK |
1061 | } |
1062 | return d_splice_alias(inode, dentry); | |
1063 | } | |
1064 | ||
1065 | ||
617ba13b | 1066 | struct dentry *ext4_get_parent(struct dentry *child) |
ac27a0ec DK |
1067 | { |
1068 | unsigned long ino; | |
ac27a0ec | 1069 | struct inode *inode; |
f702ba0f TT |
1070 | static const struct qstr dotdot = { |
1071 | .name = "..", | |
1072 | .len = 2, | |
1073 | }; | |
617ba13b | 1074 | struct ext4_dir_entry_2 * de; |
ac27a0ec DK |
1075 | struct buffer_head *bh; |
1076 | ||
f702ba0f | 1077 | bh = ext4_find_entry(child->d_inode, &dotdot, &de); |
ac27a0ec DK |
1078 | inode = NULL; |
1079 | if (!bh) | |
1080 | return ERR_PTR(-ENOENT); | |
1081 | ino = le32_to_cpu(de->inode); | |
1082 | brelse(bh); | |
1083 | ||
617ba13b MC |
1084 | if (!ext4_valid_inum(child->d_inode->i_sb, ino)) { |
1085 | ext4_error(child->d_inode->i_sb, "ext4_get_parent", | |
ac27a0ec | 1086 | "bad inode number: %lu", ino); |
1d1fe1ee | 1087 | return ERR_PTR(-EIO); |
a6c15c2b VA |
1088 | } |
1089 | ||
44003728 | 1090 | return d_obtain_alias(ext4_iget(child->d_inode->i_sb, ino)); |
ac27a0ec DK |
1091 | } |
1092 | ||
1093 | #define S_SHIFT 12 | |
617ba13b MC |
1094 | static unsigned char ext4_type_by_mode[S_IFMT >> S_SHIFT] = { |
1095 | [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE, | |
1096 | [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR, | |
1097 | [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV, | |
1098 | [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV, | |
1099 | [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO, | |
1100 | [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK, | |
1101 | [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK, | |
ac27a0ec DK |
1102 | }; |
1103 | ||
617ba13b MC |
1104 | static inline void ext4_set_de_type(struct super_block *sb, |
1105 | struct ext4_dir_entry_2 *de, | |
ac27a0ec | 1106 | umode_t mode) { |
617ba13b MC |
1107 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE)) |
1108 | de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; | |
ac27a0ec DK |
1109 | } |
1110 | ||
ef2b02d3 ES |
1111 | /* |
1112 | * Move count entries from end of map between two memory locations. | |
1113 | * Returns pointer to last entry moved. | |
1114 | */ | |
617ba13b | 1115 | static struct ext4_dir_entry_2 * |
ac27a0ec DK |
1116 | dx_move_dirents(char *from, char *to, struct dx_map_entry *map, int count) |
1117 | { | |
1118 | unsigned rec_len = 0; | |
1119 | ||
1120 | while (count--) { | |
617ba13b MC |
1121 | struct ext4_dir_entry_2 *de = (struct ext4_dir_entry_2 *) (from + map->offs); |
1122 | rec_len = EXT4_DIR_REC_LEN(de->name_len); | |
ac27a0ec | 1123 | memcpy (to, de, rec_len); |
617ba13b | 1124 | ((struct ext4_dir_entry_2 *) to)->rec_len = |
a72d7f83 | 1125 | ext4_rec_len_to_disk(rec_len); |
ac27a0ec DK |
1126 | de->inode = 0; |
1127 | map++; | |
1128 | to += rec_len; | |
1129 | } | |
617ba13b | 1130 | return (struct ext4_dir_entry_2 *) (to - rec_len); |
ac27a0ec DK |
1131 | } |
1132 | ||
ef2b02d3 ES |
1133 | /* |
1134 | * Compact each dir entry in the range to the minimal rec_len. | |
1135 | * Returns pointer to last entry in range. | |
1136 | */ | |
617ba13b | 1137 | static struct ext4_dir_entry_2* dx_pack_dirents(char *base, int size) |
ac27a0ec | 1138 | { |
617ba13b | 1139 | struct ext4_dir_entry_2 *next, *to, *prev, *de = (struct ext4_dir_entry_2 *) base; |
ac27a0ec DK |
1140 | unsigned rec_len = 0; |
1141 | ||
1142 | prev = to = de; | |
1143 | while ((char*)de < base + size) { | |
a72d7f83 | 1144 | next = ext4_next_entry(de); |
ac27a0ec | 1145 | if (de->inode && de->name_len) { |
617ba13b | 1146 | rec_len = EXT4_DIR_REC_LEN(de->name_len); |
ac27a0ec DK |
1147 | if (de > to) |
1148 | memmove(to, de, rec_len); | |
a72d7f83 | 1149 | to->rec_len = ext4_rec_len_to_disk(rec_len); |
ac27a0ec | 1150 | prev = to; |
617ba13b | 1151 | to = (struct ext4_dir_entry_2 *) (((char *) to) + rec_len); |
ac27a0ec DK |
1152 | } |
1153 | de = next; | |
1154 | } | |
1155 | return prev; | |
1156 | } | |
1157 | ||
ef2b02d3 ES |
1158 | /* |
1159 | * Split a full leaf block to make room for a new dir entry. | |
1160 | * Allocate a new block, and move entries so that they are approx. equally full. | |
1161 | * Returns pointer to de in block into which the new entry will be inserted. | |
1162 | */ | |
617ba13b | 1163 | static struct ext4_dir_entry_2 *do_split(handle_t *handle, struct inode *dir, |
ac27a0ec DK |
1164 | struct buffer_head **bh,struct dx_frame *frame, |
1165 | struct dx_hash_info *hinfo, int *error) | |
1166 | { | |
1167 | unsigned blocksize = dir->i_sb->s_blocksize; | |
1168 | unsigned count, continued; | |
1169 | struct buffer_head *bh2; | |
725d26d3 | 1170 | ext4_lblk_t newblock; |
ac27a0ec DK |
1171 | u32 hash2; |
1172 | struct dx_map_entry *map; | |
1173 | char *data1 = (*bh)->b_data, *data2; | |
59e315b4 | 1174 | unsigned split, move, size; |
617ba13b | 1175 | struct ext4_dir_entry_2 *de = NULL, *de2; |
59e315b4 | 1176 | int err = 0, i; |
ac27a0ec | 1177 | |
fedee54d | 1178 | bh2 = ext4_append (handle, dir, &newblock, &err); |
ac27a0ec DK |
1179 | if (!(bh2)) { |
1180 | brelse(*bh); | |
1181 | *bh = NULL; | |
1182 | goto errout; | |
1183 | } | |
1184 | ||
1185 | BUFFER_TRACE(*bh, "get_write_access"); | |
617ba13b | 1186 | err = ext4_journal_get_write_access(handle, *bh); |
fedee54d DM |
1187 | if (err) |
1188 | goto journal_error; | |
1189 | ||
ac27a0ec | 1190 | BUFFER_TRACE(frame->bh, "get_write_access"); |
617ba13b | 1191 | err = ext4_journal_get_write_access(handle, frame->bh); |
ac27a0ec DK |
1192 | if (err) |
1193 | goto journal_error; | |
1194 | ||
1195 | data2 = bh2->b_data; | |
1196 | ||
1197 | /* create map in the end of data2 block */ | |
1198 | map = (struct dx_map_entry *) (data2 + blocksize); | |
af5bc92d | 1199 | count = dx_make_map((struct ext4_dir_entry_2 *) data1, |
ac27a0ec DK |
1200 | blocksize, hinfo, map); |
1201 | map -= count; | |
af5bc92d | 1202 | dx_sort_map(map, count); |
ef2b02d3 ES |
1203 | /* Split the existing block in the middle, size-wise */ |
1204 | size = 0; | |
1205 | move = 0; | |
1206 | for (i = count-1; i >= 0; i--) { | |
1207 | /* is more than half of this entry in 2nd half of the block? */ | |
1208 | if (size + map[i].size/2 > blocksize/2) | |
1209 | break; | |
1210 | size += map[i].size; | |
1211 | move++; | |
1212 | } | |
1213 | /* map index at which we will split */ | |
1214 | split = count - move; | |
ac27a0ec DK |
1215 | hash2 = map[split].hash; |
1216 | continued = hash2 == map[split - 1].hash; | |
725d26d3 AK |
1217 | dxtrace(printk(KERN_INFO "Split block %lu at %x, %i/%i\n", |
1218 | (unsigned long)dx_get_block(frame->at), | |
1219 | hash2, split, count-split)); | |
ac27a0ec DK |
1220 | |
1221 | /* Fancy dance to stay within two buffers */ | |
1222 | de2 = dx_move_dirents(data1, data2, map + split, count - split); | |
af5bc92d | 1223 | de = dx_pack_dirents(data1, blocksize); |
a72d7f83 JK |
1224 | de->rec_len = ext4_rec_len_to_disk(data1 + blocksize - (char *) de); |
1225 | de2->rec_len = ext4_rec_len_to_disk(data2 + blocksize - (char *) de2); | |
617ba13b MC |
1226 | dxtrace(dx_show_leaf (hinfo, (struct ext4_dir_entry_2 *) data1, blocksize, 1)); |
1227 | dxtrace(dx_show_leaf (hinfo, (struct ext4_dir_entry_2 *) data2, blocksize, 1)); | |
ac27a0ec DK |
1228 | |
1229 | /* Which block gets the new entry? */ | |
1230 | if (hinfo->hash >= hash2) | |
1231 | { | |
1232 | swap(*bh, bh2); | |
1233 | de = de2; | |
1234 | } | |
af5bc92d TT |
1235 | dx_insert_block(frame, hash2 + continued, newblock); |
1236 | err = ext4_journal_dirty_metadata(handle, bh2); | |
ac27a0ec DK |
1237 | if (err) |
1238 | goto journal_error; | |
af5bc92d | 1239 | err = ext4_journal_dirty_metadata(handle, frame->bh); |
ac27a0ec DK |
1240 | if (err) |
1241 | goto journal_error; | |
af5bc92d TT |
1242 | brelse(bh2); |
1243 | dxtrace(dx_show_index("frame", frame->entries)); | |
ac27a0ec | 1244 | return de; |
fedee54d DM |
1245 | |
1246 | journal_error: | |
1247 | brelse(*bh); | |
1248 | brelse(bh2); | |
1249 | *bh = NULL; | |
1250 | ext4_std_error(dir->i_sb, err); | |
1251 | errout: | |
1252 | *error = err; | |
1253 | return NULL; | |
ac27a0ec | 1254 | } |
ac27a0ec DK |
1255 | |
1256 | /* | |
1257 | * Add a new entry into a directory (leaf) block. If de is non-NULL, | |
1258 | * it points to a directory entry which is guaranteed to be large | |
1259 | * enough for new directory entry. If de is NULL, then | |
1260 | * add_dirent_to_buf will attempt search the directory block for | |
1261 | * space. It will return -ENOSPC if no space is available, and -EIO | |
1262 | * and -EEXIST if directory entry already exists. | |
1263 | * | |
1264 | * NOTE! bh is NOT released in the case where ENOSPC is returned. In | |
1265 | * all other cases bh is released. | |
1266 | */ | |
1267 | static int add_dirent_to_buf(handle_t *handle, struct dentry *dentry, | |
617ba13b | 1268 | struct inode *inode, struct ext4_dir_entry_2 *de, |
af5bc92d | 1269 | struct buffer_head *bh) |
ac27a0ec DK |
1270 | { |
1271 | struct inode *dir = dentry->d_parent->d_inode; | |
1272 | const char *name = dentry->d_name.name; | |
1273 | int namelen = dentry->d_name.len; | |
1274 | unsigned long offset = 0; | |
1275 | unsigned short reclen; | |
1276 | int nlen, rlen, err; | |
1277 | char *top; | |
1278 | ||
617ba13b | 1279 | reclen = EXT4_DIR_REC_LEN(namelen); |
ac27a0ec | 1280 | if (!de) { |
617ba13b | 1281 | de = (struct ext4_dir_entry_2 *)bh->b_data; |
ac27a0ec DK |
1282 | top = bh->b_data + dir->i_sb->s_blocksize - reclen; |
1283 | while ((char *) de <= top) { | |
617ba13b | 1284 | if (!ext4_check_dir_entry("ext4_add_entry", dir, de, |
ac27a0ec | 1285 | bh, offset)) { |
af5bc92d | 1286 | brelse(bh); |
ac27a0ec DK |
1287 | return -EIO; |
1288 | } | |
af5bc92d TT |
1289 | if (ext4_match(namelen, name, de)) { |
1290 | brelse(bh); | |
ac27a0ec DK |
1291 | return -EEXIST; |
1292 | } | |
617ba13b | 1293 | nlen = EXT4_DIR_REC_LEN(de->name_len); |
a72d7f83 | 1294 | rlen = ext4_rec_len_from_disk(de->rec_len); |
ac27a0ec DK |
1295 | if ((de->inode? rlen - nlen: rlen) >= reclen) |
1296 | break; | |
617ba13b | 1297 | de = (struct ext4_dir_entry_2 *)((char *)de + rlen); |
ac27a0ec DK |
1298 | offset += rlen; |
1299 | } | |
1300 | if ((char *) de > top) | |
1301 | return -ENOSPC; | |
1302 | } | |
1303 | BUFFER_TRACE(bh, "get_write_access"); | |
617ba13b | 1304 | err = ext4_journal_get_write_access(handle, bh); |
ac27a0ec | 1305 | if (err) { |
617ba13b | 1306 | ext4_std_error(dir->i_sb, err); |
ac27a0ec DK |
1307 | brelse(bh); |
1308 | return err; | |
1309 | } | |
1310 | ||
1311 | /* By now the buffer is marked for journaling */ | |
617ba13b | 1312 | nlen = EXT4_DIR_REC_LEN(de->name_len); |
a72d7f83 | 1313 | rlen = ext4_rec_len_from_disk(de->rec_len); |
ac27a0ec | 1314 | if (de->inode) { |
617ba13b | 1315 | struct ext4_dir_entry_2 *de1 = (struct ext4_dir_entry_2 *)((char *)de + nlen); |
a72d7f83 JK |
1316 | de1->rec_len = ext4_rec_len_to_disk(rlen - nlen); |
1317 | de->rec_len = ext4_rec_len_to_disk(nlen); | |
ac27a0ec DK |
1318 | de = de1; |
1319 | } | |
617ba13b | 1320 | de->file_type = EXT4_FT_UNKNOWN; |
ac27a0ec DK |
1321 | if (inode) { |
1322 | de->inode = cpu_to_le32(inode->i_ino); | |
617ba13b | 1323 | ext4_set_de_type(dir->i_sb, de, inode->i_mode); |
ac27a0ec DK |
1324 | } else |
1325 | de->inode = 0; | |
1326 | de->name_len = namelen; | |
af5bc92d | 1327 | memcpy(de->name, name, namelen); |
ac27a0ec DK |
1328 | /* |
1329 | * XXX shouldn't update any times until successful | |
1330 | * completion of syscall, but too many callers depend | |
1331 | * on this. | |
1332 | * | |
1333 | * XXX similarly, too many callers depend on | |
617ba13b | 1334 | * ext4_new_inode() setting the times, but error |
ac27a0ec DK |
1335 | * recovery deletes the inode, so the worst that can |
1336 | * happen is that the times are slightly out of date | |
1337 | * and/or different from the directory change time. | |
1338 | */ | |
ef7f3835 | 1339 | dir->i_mtime = dir->i_ctime = ext4_current_time(dir); |
617ba13b | 1340 | ext4_update_dx_flag(dir); |
ac27a0ec | 1341 | dir->i_version++; |
617ba13b MC |
1342 | ext4_mark_inode_dirty(handle, dir); |
1343 | BUFFER_TRACE(bh, "call ext4_journal_dirty_metadata"); | |
1344 | err = ext4_journal_dirty_metadata(handle, bh); | |
ac27a0ec | 1345 | if (err) |
617ba13b | 1346 | ext4_std_error(dir->i_sb, err); |
ac27a0ec DK |
1347 | brelse(bh); |
1348 | return 0; | |
1349 | } | |
1350 | ||
ac27a0ec DK |
1351 | /* |
1352 | * This converts a one block unindexed directory to a 3 block indexed | |
1353 | * directory, and adds the dentry to the indexed directory. | |
1354 | */ | |
1355 | static int make_indexed_dir(handle_t *handle, struct dentry *dentry, | |
1356 | struct inode *inode, struct buffer_head *bh) | |
1357 | { | |
1358 | struct inode *dir = dentry->d_parent->d_inode; | |
1359 | const char *name = dentry->d_name.name; | |
1360 | int namelen = dentry->d_name.len; | |
1361 | struct buffer_head *bh2; | |
1362 | struct dx_root *root; | |
1363 | struct dx_frame frames[2], *frame; | |
1364 | struct dx_entry *entries; | |
617ba13b | 1365 | struct ext4_dir_entry_2 *de, *de2; |
ac27a0ec DK |
1366 | char *data1, *top; |
1367 | unsigned len; | |
1368 | int retval; | |
1369 | unsigned blocksize; | |
1370 | struct dx_hash_info hinfo; | |
725d26d3 | 1371 | ext4_lblk_t block; |
ac27a0ec DK |
1372 | struct fake_dirent *fde; |
1373 | ||
1374 | blocksize = dir->i_sb->s_blocksize; | |
4776004f | 1375 | dxtrace(printk(KERN_DEBUG "Creating index\n")); |
617ba13b | 1376 | retval = ext4_journal_get_write_access(handle, bh); |
ac27a0ec | 1377 | if (retval) { |
617ba13b | 1378 | ext4_std_error(dir->i_sb, retval); |
ac27a0ec DK |
1379 | brelse(bh); |
1380 | return retval; | |
1381 | } | |
1382 | root = (struct dx_root *) bh->b_data; | |
1383 | ||
af5bc92d | 1384 | bh2 = ext4_append(handle, dir, &block, &retval); |
ac27a0ec DK |
1385 | if (!(bh2)) { |
1386 | brelse(bh); | |
1387 | return retval; | |
1388 | } | |
617ba13b | 1389 | EXT4_I(dir)->i_flags |= EXT4_INDEX_FL; |
ac27a0ec DK |
1390 | data1 = bh2->b_data; |
1391 | ||
1392 | /* The 0th block becomes the root, move the dirents out */ | |
1393 | fde = &root->dotdot; | |
a72d7f83 JK |
1394 | de = (struct ext4_dir_entry_2 *)((char *)fde + |
1395 | ext4_rec_len_from_disk(fde->rec_len)); | |
ac27a0ec DK |
1396 | len = ((char *) root) + blocksize - (char *) de; |
1397 | memcpy (data1, de, len); | |
617ba13b | 1398 | de = (struct ext4_dir_entry_2 *) data1; |
ac27a0ec | 1399 | top = data1 + len; |
a72d7f83 | 1400 | while ((char *)(de2 = ext4_next_entry(de)) < top) |
ac27a0ec | 1401 | de = de2; |
a72d7f83 | 1402 | de->rec_len = ext4_rec_len_to_disk(data1 + blocksize - (char *) de); |
ac27a0ec | 1403 | /* Initialize the root; the dot dirents already exist */ |
617ba13b | 1404 | de = (struct ext4_dir_entry_2 *) (&root->dotdot); |
a72d7f83 | 1405 | de->rec_len = ext4_rec_len_to_disk(blocksize - EXT4_DIR_REC_LEN(2)); |
ac27a0ec DK |
1406 | memset (&root->info, 0, sizeof(root->info)); |
1407 | root->info.info_length = sizeof(root->info); | |
617ba13b | 1408 | root->info.hash_version = EXT4_SB(dir->i_sb)->s_def_hash_version; |
ac27a0ec | 1409 | entries = root->entries; |
af5bc92d TT |
1410 | dx_set_block(entries, 1); |
1411 | dx_set_count(entries, 1); | |
1412 | dx_set_limit(entries, dx_root_limit(dir, sizeof(root->info))); | |
ac27a0ec DK |
1413 | |
1414 | /* Initialize as for dx_probe */ | |
1415 | hinfo.hash_version = root->info.hash_version; | |
f99b2589 TT |
1416 | if (hinfo.hash_version <= DX_HASH_TEA) |
1417 | hinfo.hash_version += EXT4_SB(dir->i_sb)->s_hash_unsigned; | |
617ba13b MC |
1418 | hinfo.seed = EXT4_SB(dir->i_sb)->s_hash_seed; |
1419 | ext4fs_dirhash(name, namelen, &hinfo); | |
ac27a0ec DK |
1420 | frame = frames; |
1421 | frame->entries = entries; | |
1422 | frame->at = entries; | |
1423 | frame->bh = bh; | |
1424 | bh = bh2; | |
1425 | de = do_split(handle,dir, &bh, frame, &hinfo, &retval); | |
1426 | dx_release (frames); | |
1427 | if (!(de)) | |
1428 | return retval; | |
1429 | ||
1430 | return add_dirent_to_buf(handle, dentry, inode, de, bh); | |
1431 | } | |
ac27a0ec DK |
1432 | |
1433 | /* | |
617ba13b | 1434 | * ext4_add_entry() |
ac27a0ec DK |
1435 | * |
1436 | * adds a file entry to the specified directory, using the same | |
617ba13b | 1437 | * semantics as ext4_find_entry(). It returns NULL if it failed. |
ac27a0ec DK |
1438 | * |
1439 | * NOTE!! The inode part of 'de' is left at 0 - which means you | |
1440 | * may not sleep between calling this and putting something into | |
1441 | * the entry, as someone else might have used it while you slept. | |
1442 | */ | |
af5bc92d TT |
1443 | static int ext4_add_entry(handle_t *handle, struct dentry *dentry, |
1444 | struct inode *inode) | |
ac27a0ec DK |
1445 | { |
1446 | struct inode *dir = dentry->d_parent->d_inode; | |
1447 | unsigned long offset; | |
af5bc92d | 1448 | struct buffer_head *bh; |
617ba13b | 1449 | struct ext4_dir_entry_2 *de; |
af5bc92d | 1450 | struct super_block *sb; |
ac27a0ec | 1451 | int retval; |
ac27a0ec | 1452 | int dx_fallback=0; |
ac27a0ec | 1453 | unsigned blocksize; |
725d26d3 | 1454 | ext4_lblk_t block, blocks; |
ac27a0ec DK |
1455 | |
1456 | sb = dir->i_sb; | |
1457 | blocksize = sb->s_blocksize; | |
1458 | if (!dentry->d_name.len) | |
1459 | return -EINVAL; | |
ac27a0ec | 1460 | if (is_dx(dir)) { |
617ba13b | 1461 | retval = ext4_dx_add_entry(handle, dentry, inode); |
ac27a0ec DK |
1462 | if (!retval || (retval != ERR_BAD_DX_DIR)) |
1463 | return retval; | |
617ba13b | 1464 | EXT4_I(dir)->i_flags &= ~EXT4_INDEX_FL; |
ac27a0ec | 1465 | dx_fallback++; |
617ba13b | 1466 | ext4_mark_inode_dirty(handle, dir); |
ac27a0ec | 1467 | } |
ac27a0ec DK |
1468 | blocks = dir->i_size >> sb->s_blocksize_bits; |
1469 | for (block = 0, offset = 0; block < blocks; block++) { | |
617ba13b | 1470 | bh = ext4_bread(handle, dir, block, 0, &retval); |
ac27a0ec DK |
1471 | if(!bh) |
1472 | return retval; | |
1473 | retval = add_dirent_to_buf(handle, dentry, inode, NULL, bh); | |
1474 | if (retval != -ENOSPC) | |
1475 | return retval; | |
1476 | ||
ac27a0ec | 1477 | if (blocks == 1 && !dx_fallback && |
617ba13b | 1478 | EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_DIR_INDEX)) |
ac27a0ec | 1479 | return make_indexed_dir(handle, dentry, inode, bh); |
ac27a0ec DK |
1480 | brelse(bh); |
1481 | } | |
617ba13b | 1482 | bh = ext4_append(handle, dir, &block, &retval); |
ac27a0ec DK |
1483 | if (!bh) |
1484 | return retval; | |
617ba13b | 1485 | de = (struct ext4_dir_entry_2 *) bh->b_data; |
ac27a0ec | 1486 | de->inode = 0; |
a72d7f83 | 1487 | de->rec_len = ext4_rec_len_to_disk(blocksize); |
ac27a0ec DK |
1488 | return add_dirent_to_buf(handle, dentry, inode, de, bh); |
1489 | } | |
1490 | ||
ac27a0ec DK |
1491 | /* |
1492 | * Returns 0 for success, or a negative error value | |
1493 | */ | |
617ba13b | 1494 | static int ext4_dx_add_entry(handle_t *handle, struct dentry *dentry, |
ac27a0ec DK |
1495 | struct inode *inode) |
1496 | { | |
1497 | struct dx_frame frames[2], *frame; | |
1498 | struct dx_entry *entries, *at; | |
1499 | struct dx_hash_info hinfo; | |
af5bc92d | 1500 | struct buffer_head *bh; |
ac27a0ec | 1501 | struct inode *dir = dentry->d_parent->d_inode; |
af5bc92d | 1502 | struct super_block *sb = dir->i_sb; |
617ba13b | 1503 | struct ext4_dir_entry_2 *de; |
ac27a0ec DK |
1504 | int err; |
1505 | ||
f702ba0f | 1506 | frame = dx_probe(&dentry->d_name, dir, &hinfo, frames, &err); |
ac27a0ec DK |
1507 | if (!frame) |
1508 | return err; | |
1509 | entries = frame->entries; | |
1510 | at = frame->at; | |
1511 | ||
617ba13b | 1512 | if (!(bh = ext4_bread(handle,dir, dx_get_block(frame->at), 0, &err))) |
ac27a0ec DK |
1513 | goto cleanup; |
1514 | ||
1515 | BUFFER_TRACE(bh, "get_write_access"); | |
617ba13b | 1516 | err = ext4_journal_get_write_access(handle, bh); |
ac27a0ec DK |
1517 | if (err) |
1518 | goto journal_error; | |
1519 | ||
1520 | err = add_dirent_to_buf(handle, dentry, inode, NULL, bh); | |
1521 | if (err != -ENOSPC) { | |
1522 | bh = NULL; | |
1523 | goto cleanup; | |
1524 | } | |
1525 | ||
1526 | /* Block full, should compress but for now just split */ | |
4776004f | 1527 | dxtrace(printk(KERN_DEBUG "using %u of %u node entries\n", |
ac27a0ec DK |
1528 | dx_get_count(entries), dx_get_limit(entries))); |
1529 | /* Need to split index? */ | |
1530 | if (dx_get_count(entries) == dx_get_limit(entries)) { | |
725d26d3 | 1531 | ext4_lblk_t newblock; |
ac27a0ec DK |
1532 | unsigned icount = dx_get_count(entries); |
1533 | int levels = frame - frames; | |
1534 | struct dx_entry *entries2; | |
1535 | struct dx_node *node2; | |
1536 | struct buffer_head *bh2; | |
1537 | ||
1538 | if (levels && (dx_get_count(frames->entries) == | |
1539 | dx_get_limit(frames->entries))) { | |
46e665e9 | 1540 | ext4_warning(sb, __func__, |
ac27a0ec DK |
1541 | "Directory index full!"); |
1542 | err = -ENOSPC; | |
1543 | goto cleanup; | |
1544 | } | |
617ba13b | 1545 | bh2 = ext4_append (handle, dir, &newblock, &err); |
ac27a0ec DK |
1546 | if (!(bh2)) |
1547 | goto cleanup; | |
1548 | node2 = (struct dx_node *)(bh2->b_data); | |
1549 | entries2 = node2->entries; | |
a72d7f83 | 1550 | node2->fake.rec_len = ext4_rec_len_to_disk(sb->s_blocksize); |
ac27a0ec DK |
1551 | node2->fake.inode = 0; |
1552 | BUFFER_TRACE(frame->bh, "get_write_access"); | |
617ba13b | 1553 | err = ext4_journal_get_write_access(handle, frame->bh); |
ac27a0ec DK |
1554 | if (err) |
1555 | goto journal_error; | |
1556 | if (levels) { | |
1557 | unsigned icount1 = icount/2, icount2 = icount - icount1; | |
1558 | unsigned hash2 = dx_get_hash(entries + icount1); | |
4776004f TT |
1559 | dxtrace(printk(KERN_DEBUG "Split index %i/%i\n", |
1560 | icount1, icount2)); | |
ac27a0ec DK |
1561 | |
1562 | BUFFER_TRACE(frame->bh, "get_write_access"); /* index root */ | |
617ba13b | 1563 | err = ext4_journal_get_write_access(handle, |
ac27a0ec DK |
1564 | frames[0].bh); |
1565 | if (err) | |
1566 | goto journal_error; | |
1567 | ||
af5bc92d TT |
1568 | memcpy((char *) entries2, (char *) (entries + icount1), |
1569 | icount2 * sizeof(struct dx_entry)); | |
1570 | dx_set_count(entries, icount1); | |
1571 | dx_set_count(entries2, icount2); | |
1572 | dx_set_limit(entries2, dx_node_limit(dir)); | |
ac27a0ec DK |
1573 | |
1574 | /* Which index block gets the new entry? */ | |
1575 | if (at - entries >= icount1) { | |
1576 | frame->at = at = at - entries - icount1 + entries2; | |
1577 | frame->entries = entries = entries2; | |
1578 | swap(frame->bh, bh2); | |
1579 | } | |
af5bc92d TT |
1580 | dx_insert_block(frames + 0, hash2, newblock); |
1581 | dxtrace(dx_show_index("node", frames[1].entries)); | |
1582 | dxtrace(dx_show_index("node", | |
ac27a0ec | 1583 | ((struct dx_node *) bh2->b_data)->entries)); |
617ba13b | 1584 | err = ext4_journal_dirty_metadata(handle, bh2); |
ac27a0ec DK |
1585 | if (err) |
1586 | goto journal_error; | |
1587 | brelse (bh2); | |
1588 | } else { | |
4776004f TT |
1589 | dxtrace(printk(KERN_DEBUG |
1590 | "Creating second level index...\n")); | |
ac27a0ec DK |
1591 | memcpy((char *) entries2, (char *) entries, |
1592 | icount * sizeof(struct dx_entry)); | |
1593 | dx_set_limit(entries2, dx_node_limit(dir)); | |
1594 | ||
1595 | /* Set up root */ | |
1596 | dx_set_count(entries, 1); | |
1597 | dx_set_block(entries + 0, newblock); | |
1598 | ((struct dx_root *) frames[0].bh->b_data)->info.indirect_levels = 1; | |
1599 | ||
1600 | /* Add new access path frame */ | |
1601 | frame = frames + 1; | |
1602 | frame->at = at = at - entries + entries2; | |
1603 | frame->entries = entries = entries2; | |
1604 | frame->bh = bh2; | |
617ba13b | 1605 | err = ext4_journal_get_write_access(handle, |
ac27a0ec DK |
1606 | frame->bh); |
1607 | if (err) | |
1608 | goto journal_error; | |
1609 | } | |
617ba13b | 1610 | ext4_journal_dirty_metadata(handle, frames[0].bh); |
ac27a0ec DK |
1611 | } |
1612 | de = do_split(handle, dir, &bh, frame, &hinfo, &err); | |
1613 | if (!de) | |
1614 | goto cleanup; | |
1615 | err = add_dirent_to_buf(handle, dentry, inode, de, bh); | |
1616 | bh = NULL; | |
1617 | goto cleanup; | |
1618 | ||
1619 | journal_error: | |
617ba13b | 1620 | ext4_std_error(dir->i_sb, err); |
ac27a0ec DK |
1621 | cleanup: |
1622 | if (bh) | |
1623 | brelse(bh); | |
1624 | dx_release(frames); | |
1625 | return err; | |
1626 | } | |
ac27a0ec DK |
1627 | |
1628 | /* | |
617ba13b | 1629 | * ext4_delete_entry deletes a directory entry by merging it with the |
ac27a0ec DK |
1630 | * previous entry |
1631 | */ | |
af5bc92d TT |
1632 | static int ext4_delete_entry(handle_t *handle, |
1633 | struct inode *dir, | |
1634 | struct ext4_dir_entry_2 *de_del, | |
1635 | struct buffer_head *bh) | |
ac27a0ec | 1636 | { |
af5bc92d | 1637 | struct ext4_dir_entry_2 *de, *pde; |
ac27a0ec DK |
1638 | int i; |
1639 | ||
1640 | i = 0; | |
1641 | pde = NULL; | |
617ba13b | 1642 | de = (struct ext4_dir_entry_2 *) bh->b_data; |
ac27a0ec | 1643 | while (i < bh->b_size) { |
617ba13b | 1644 | if (!ext4_check_dir_entry("ext4_delete_entry", dir, de, bh, i)) |
ac27a0ec DK |
1645 | return -EIO; |
1646 | if (de == de_del) { | |
1647 | BUFFER_TRACE(bh, "get_write_access"); | |
617ba13b | 1648 | ext4_journal_get_write_access(handle, bh); |
ac27a0ec | 1649 | if (pde) |
a72d7f83 JK |
1650 | pde->rec_len = ext4_rec_len_to_disk( |
1651 | ext4_rec_len_from_disk(pde->rec_len) + | |
1652 | ext4_rec_len_from_disk(de->rec_len)); | |
ac27a0ec DK |
1653 | else |
1654 | de->inode = 0; | |
1655 | dir->i_version++; | |
617ba13b MC |
1656 | BUFFER_TRACE(bh, "call ext4_journal_dirty_metadata"); |
1657 | ext4_journal_dirty_metadata(handle, bh); | |
ac27a0ec DK |
1658 | return 0; |
1659 | } | |
a72d7f83 | 1660 | i += ext4_rec_len_from_disk(de->rec_len); |
ac27a0ec | 1661 | pde = de; |
a72d7f83 | 1662 | de = ext4_next_entry(de); |
ac27a0ec DK |
1663 | } |
1664 | return -ENOENT; | |
1665 | } | |
1666 | ||
f8628a14 AD |
1667 | /* |
1668 | * DIR_NLINK feature is set if 1) nlinks > EXT4_LINK_MAX or 2) nlinks == 2, | |
1669 | * since this indicates that nlinks count was previously 1. | |
1670 | */ | |
1671 | static void ext4_inc_count(handle_t *handle, struct inode *inode) | |
1672 | { | |
1673 | inc_nlink(inode); | |
1674 | if (is_dx(inode) && inode->i_nlink > 1) { | |
1675 | /* limit is 16-bit i_links_count */ | |
1676 | if (inode->i_nlink >= EXT4_LINK_MAX || inode->i_nlink == 2) { | |
1677 | inode->i_nlink = 1; | |
1678 | EXT4_SET_RO_COMPAT_FEATURE(inode->i_sb, | |
1679 | EXT4_FEATURE_RO_COMPAT_DIR_NLINK); | |
1680 | } | |
1681 | } | |
1682 | } | |
1683 | ||
1684 | /* | |
1685 | * If a directory had nlink == 1, then we should let it be 1. This indicates | |
1686 | * directory has >EXT4_LINK_MAX subdirs. | |
1687 | */ | |
1688 | static void ext4_dec_count(handle_t *handle, struct inode *inode) | |
1689 | { | |
1690 | drop_nlink(inode); | |
1691 | if (S_ISDIR(inode->i_mode) && inode->i_nlink == 0) | |
1692 | inc_nlink(inode); | |
1693 | } | |
1694 | ||
1695 | ||
617ba13b | 1696 | static int ext4_add_nondir(handle_t *handle, |
ac27a0ec DK |
1697 | struct dentry *dentry, struct inode *inode) |
1698 | { | |
617ba13b | 1699 | int err = ext4_add_entry(handle, dentry, inode); |
ac27a0ec | 1700 | if (!err) { |
617ba13b | 1701 | ext4_mark_inode_dirty(handle, inode); |
ac27a0ec | 1702 | d_instantiate(dentry, inode); |
6b38e842 | 1703 | unlock_new_inode(inode); |
ac27a0ec DK |
1704 | return 0; |
1705 | } | |
731b9a54 | 1706 | drop_nlink(inode); |
6b38e842 | 1707 | unlock_new_inode(inode); |
ac27a0ec DK |
1708 | iput(inode); |
1709 | return err; | |
1710 | } | |
1711 | ||
1712 | /* | |
1713 | * By the time this is called, we already have created | |
1714 | * the directory cache entry for the new file, but it | |
1715 | * is so far negative - it has no inode. | |
1716 | * | |
1717 | * If the create succeeds, we fill in the inode information | |
1718 | * with d_instantiate(). | |
1719 | */ | |
af5bc92d TT |
1720 | static int ext4_create(struct inode *dir, struct dentry *dentry, int mode, |
1721 | struct nameidata *nd) | |
ac27a0ec DK |
1722 | { |
1723 | handle_t *handle; | |
af5bc92d | 1724 | struct inode *inode; |
ac27a0ec DK |
1725 | int err, retries = 0; |
1726 | ||
1727 | retry: | |
617ba13b MC |
1728 | handle = ext4_journal_start(dir, EXT4_DATA_TRANS_BLOCKS(dir->i_sb) + |
1729 | EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3 + | |
1730 | 2*EXT4_QUOTA_INIT_BLOCKS(dir->i_sb)); | |
ac27a0ec DK |
1731 | if (IS_ERR(handle)) |
1732 | return PTR_ERR(handle); | |
1733 | ||
1734 | if (IS_DIRSYNC(dir)) | |
1735 | handle->h_sync = 1; | |
1736 | ||
617ba13b | 1737 | inode = ext4_new_inode (handle, dir, mode); |
ac27a0ec DK |
1738 | err = PTR_ERR(inode); |
1739 | if (!IS_ERR(inode)) { | |
617ba13b MC |
1740 | inode->i_op = &ext4_file_inode_operations; |
1741 | inode->i_fop = &ext4_file_operations; | |
1742 | ext4_set_aops(inode); | |
1743 | err = ext4_add_nondir(handle, dentry, inode); | |
ac27a0ec | 1744 | } |
617ba13b MC |
1745 | ext4_journal_stop(handle); |
1746 | if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries)) | |
ac27a0ec DK |
1747 | goto retry; |
1748 | return err; | |
1749 | } | |
1750 | ||
af5bc92d TT |
1751 | static int ext4_mknod(struct inode *dir, struct dentry *dentry, |
1752 | int mode, dev_t rdev) | |
ac27a0ec DK |
1753 | { |
1754 | handle_t *handle; | |
1755 | struct inode *inode; | |
1756 | int err, retries = 0; | |
1757 | ||
1758 | if (!new_valid_dev(rdev)) | |
1759 | return -EINVAL; | |
1760 | ||
1761 | retry: | |
617ba13b MC |
1762 | handle = ext4_journal_start(dir, EXT4_DATA_TRANS_BLOCKS(dir->i_sb) + |
1763 | EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3 + | |
1764 | 2*EXT4_QUOTA_INIT_BLOCKS(dir->i_sb)); | |
ac27a0ec DK |
1765 | if (IS_ERR(handle)) |
1766 | return PTR_ERR(handle); | |
1767 | ||
1768 | if (IS_DIRSYNC(dir)) | |
1769 | handle->h_sync = 1; | |
1770 | ||
af5bc92d | 1771 | inode = ext4_new_inode(handle, dir, mode); |
ac27a0ec DK |
1772 | err = PTR_ERR(inode); |
1773 | if (!IS_ERR(inode)) { | |
1774 | init_special_inode(inode, inode->i_mode, rdev); | |
03010a33 | 1775 | #ifdef CONFIG_EXT4_FS_XATTR |
617ba13b | 1776 | inode->i_op = &ext4_special_inode_operations; |
ac27a0ec | 1777 | #endif |
617ba13b | 1778 | err = ext4_add_nondir(handle, dentry, inode); |
ac27a0ec | 1779 | } |
617ba13b MC |
1780 | ext4_journal_stop(handle); |
1781 | if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries)) | |
ac27a0ec DK |
1782 | goto retry; |
1783 | return err; | |
1784 | } | |
1785 | ||
af5bc92d | 1786 | static int ext4_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
ac27a0ec DK |
1787 | { |
1788 | handle_t *handle; | |
af5bc92d TT |
1789 | struct inode *inode; |
1790 | struct buffer_head *dir_block; | |
1791 | struct ext4_dir_entry_2 *de; | |
ac27a0ec DK |
1792 | int err, retries = 0; |
1793 | ||
f8628a14 | 1794 | if (EXT4_DIR_LINK_MAX(dir)) |
ac27a0ec DK |
1795 | return -EMLINK; |
1796 | ||
1797 | retry: | |
617ba13b MC |
1798 | handle = ext4_journal_start(dir, EXT4_DATA_TRANS_BLOCKS(dir->i_sb) + |
1799 | EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3 + | |
1800 | 2*EXT4_QUOTA_INIT_BLOCKS(dir->i_sb)); | |
ac27a0ec DK |
1801 | if (IS_ERR(handle)) |
1802 | return PTR_ERR(handle); | |
1803 | ||
1804 | if (IS_DIRSYNC(dir)) | |
1805 | handle->h_sync = 1; | |
1806 | ||
af5bc92d | 1807 | inode = ext4_new_inode(handle, dir, S_IFDIR | mode); |
ac27a0ec DK |
1808 | err = PTR_ERR(inode); |
1809 | if (IS_ERR(inode)) | |
1810 | goto out_stop; | |
1811 | ||
617ba13b MC |
1812 | inode->i_op = &ext4_dir_inode_operations; |
1813 | inode->i_fop = &ext4_dir_operations; | |
1814 | inode->i_size = EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize; | |
af5bc92d | 1815 | dir_block = ext4_bread(handle, inode, 0, 1, &err); |
4cdeed86 AK |
1816 | if (!dir_block) |
1817 | goto out_clear_inode; | |
ac27a0ec | 1818 | BUFFER_TRACE(dir_block, "get_write_access"); |
617ba13b MC |
1819 | ext4_journal_get_write_access(handle, dir_block); |
1820 | de = (struct ext4_dir_entry_2 *) dir_block->b_data; | |
ac27a0ec DK |
1821 | de->inode = cpu_to_le32(inode->i_ino); |
1822 | de->name_len = 1; | |
a72d7f83 | 1823 | de->rec_len = ext4_rec_len_to_disk(EXT4_DIR_REC_LEN(de->name_len)); |
af5bc92d | 1824 | strcpy(de->name, "."); |
617ba13b | 1825 | ext4_set_de_type(dir->i_sb, de, S_IFDIR); |
a72d7f83 | 1826 | de = ext4_next_entry(de); |
ac27a0ec | 1827 | de->inode = cpu_to_le32(dir->i_ino); |
a72d7f83 JK |
1828 | de->rec_len = ext4_rec_len_to_disk(inode->i_sb->s_blocksize - |
1829 | EXT4_DIR_REC_LEN(1)); | |
ac27a0ec | 1830 | de->name_len = 2; |
af5bc92d | 1831 | strcpy(de->name, ".."); |
617ba13b | 1832 | ext4_set_de_type(dir->i_sb, de, S_IFDIR); |
ac27a0ec | 1833 | inode->i_nlink = 2; |
617ba13b MC |
1834 | BUFFER_TRACE(dir_block, "call ext4_journal_dirty_metadata"); |
1835 | ext4_journal_dirty_metadata(handle, dir_block); | |
af5bc92d | 1836 | brelse(dir_block); |
617ba13b | 1837 | ext4_mark_inode_dirty(handle, inode); |
af5bc92d | 1838 | err = ext4_add_entry(handle, dentry, inode); |
ac27a0ec | 1839 | if (err) { |
4cdeed86 AK |
1840 | out_clear_inode: |
1841 | clear_nlink(inode); | |
6b38e842 | 1842 | unlock_new_inode(inode); |
617ba13b | 1843 | ext4_mark_inode_dirty(handle, inode); |
af5bc92d | 1844 | iput(inode); |
ac27a0ec DK |
1845 | goto out_stop; |
1846 | } | |
f8628a14 | 1847 | ext4_inc_count(handle, dir); |
617ba13b MC |
1848 | ext4_update_dx_flag(dir); |
1849 | ext4_mark_inode_dirty(handle, dir); | |
ac27a0ec | 1850 | d_instantiate(dentry, inode); |
6b38e842 | 1851 | unlock_new_inode(inode); |
ac27a0ec | 1852 | out_stop: |
617ba13b MC |
1853 | ext4_journal_stop(handle); |
1854 | if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries)) | |
ac27a0ec DK |
1855 | goto retry; |
1856 | return err; | |
1857 | } | |
1858 | ||
1859 | /* | |
1860 | * routine to check that the specified directory is empty (for rmdir) | |
1861 | */ | |
af5bc92d | 1862 | static int empty_dir(struct inode *inode) |
ac27a0ec DK |
1863 | { |
1864 | unsigned long offset; | |
af5bc92d TT |
1865 | struct buffer_head *bh; |
1866 | struct ext4_dir_entry_2 *de, *de1; | |
1867 | struct super_block *sb; | |
ac27a0ec DK |
1868 | int err = 0; |
1869 | ||
1870 | sb = inode->i_sb; | |
617ba13b | 1871 | if (inode->i_size < EXT4_DIR_REC_LEN(1) + EXT4_DIR_REC_LEN(2) || |
af5bc92d | 1872 | !(bh = ext4_bread(NULL, inode, 0, 0, &err))) { |
ac27a0ec | 1873 | if (err) |
46e665e9 | 1874 | ext4_error(inode->i_sb, __func__, |
ac27a0ec DK |
1875 | "error %d reading directory #%lu offset 0", |
1876 | err, inode->i_ino); | |
1877 | else | |
46e665e9 | 1878 | ext4_warning(inode->i_sb, __func__, |
ac27a0ec DK |
1879 | "bad directory (dir #%lu) - no data block", |
1880 | inode->i_ino); | |
1881 | return 1; | |
1882 | } | |
617ba13b | 1883 | de = (struct ext4_dir_entry_2 *) bh->b_data; |
a72d7f83 | 1884 | de1 = ext4_next_entry(de); |
ac27a0ec DK |
1885 | if (le32_to_cpu(de->inode) != inode->i_ino || |
1886 | !le32_to_cpu(de1->inode) || | |
af5bc92d TT |
1887 | strcmp(".", de->name) || |
1888 | strcmp("..", de1->name)) { | |
1889 | ext4_warning(inode->i_sb, "empty_dir", | |
1890 | "bad directory (dir #%lu) - no `.' or `..'", | |
1891 | inode->i_ino); | |
1892 | brelse(bh); | |
ac27a0ec DK |
1893 | return 1; |
1894 | } | |
a72d7f83 JK |
1895 | offset = ext4_rec_len_from_disk(de->rec_len) + |
1896 | ext4_rec_len_from_disk(de1->rec_len); | |
1897 | de = ext4_next_entry(de1); | |
af5bc92d | 1898 | while (offset < inode->i_size) { |
ac27a0ec DK |
1899 | if (!bh || |
1900 | (void *) de >= (void *) (bh->b_data+sb->s_blocksize)) { | |
1901 | err = 0; | |
af5bc92d TT |
1902 | brelse(bh); |
1903 | bh = ext4_bread(NULL, inode, | |
617ba13b | 1904 | offset >> EXT4_BLOCK_SIZE_BITS(sb), 0, &err); |
ac27a0ec DK |
1905 | if (!bh) { |
1906 | if (err) | |
46e665e9 | 1907 | ext4_error(sb, __func__, |
ac27a0ec DK |
1908 | "error %d reading directory" |
1909 | " #%lu offset %lu", | |
1910 | err, inode->i_ino, offset); | |
1911 | offset += sb->s_blocksize; | |
1912 | continue; | |
1913 | } | |
617ba13b | 1914 | de = (struct ext4_dir_entry_2 *) bh->b_data; |
ac27a0ec | 1915 | } |
617ba13b MC |
1916 | if (!ext4_check_dir_entry("empty_dir", inode, de, bh, offset)) { |
1917 | de = (struct ext4_dir_entry_2 *)(bh->b_data + | |
ac27a0ec DK |
1918 | sb->s_blocksize); |
1919 | offset = (offset | (sb->s_blocksize - 1)) + 1; | |
1920 | continue; | |
1921 | } | |
1922 | if (le32_to_cpu(de->inode)) { | |
af5bc92d | 1923 | brelse(bh); |
ac27a0ec DK |
1924 | return 0; |
1925 | } | |
a72d7f83 JK |
1926 | offset += ext4_rec_len_from_disk(de->rec_len); |
1927 | de = ext4_next_entry(de); | |
ac27a0ec | 1928 | } |
af5bc92d | 1929 | brelse(bh); |
ac27a0ec DK |
1930 | return 1; |
1931 | } | |
1932 | ||
617ba13b | 1933 | /* ext4_orphan_add() links an unlinked or truncated inode into a list of |
ac27a0ec DK |
1934 | * such inodes, starting at the superblock, in case we crash before the |
1935 | * file is closed/deleted, or in case the inode truncate spans multiple | |
1936 | * transactions and the last transaction is not recovered after a crash. | |
1937 | * | |
1938 | * At filesystem recovery time, we walk this list deleting unlinked | |
617ba13b | 1939 | * inodes and truncating linked inodes in ext4_orphan_cleanup(). |
ac27a0ec | 1940 | */ |
617ba13b | 1941 | int ext4_orphan_add(handle_t *handle, struct inode *inode) |
ac27a0ec DK |
1942 | { |
1943 | struct super_block *sb = inode->i_sb; | |
617ba13b | 1944 | struct ext4_iloc iloc; |
ac27a0ec DK |
1945 | int err = 0, rc; |
1946 | ||
1947 | lock_super(sb); | |
617ba13b | 1948 | if (!list_empty(&EXT4_I(inode)->i_orphan)) |
ac27a0ec DK |
1949 | goto out_unlock; |
1950 | ||
1951 | /* Orphan handling is only valid for files with data blocks | |
1952 | * being truncated, or files being unlinked. */ | |
1953 | ||
1954 | /* @@@ FIXME: Observation from aviro: | |
617ba13b MC |
1955 | * I think I can trigger J_ASSERT in ext4_orphan_add(). We block |
1956 | * here (on lock_super()), so race with ext4_link() which might bump | |
ac27a0ec DK |
1957 | * ->i_nlink. For, say it, character device. Not a regular file, |
1958 | * not a directory, not a symlink and ->i_nlink > 0. | |
1959 | */ | |
af5bc92d TT |
1960 | J_ASSERT((S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || |
1961 | S_ISLNK(inode->i_mode)) || inode->i_nlink == 0); | |
ac27a0ec | 1962 | |
617ba13b MC |
1963 | BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); |
1964 | err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh); | |
ac27a0ec DK |
1965 | if (err) |
1966 | goto out_unlock; | |
1967 | ||
617ba13b | 1968 | err = ext4_reserve_inode_write(handle, inode, &iloc); |
ac27a0ec DK |
1969 | if (err) |
1970 | goto out_unlock; | |
1971 | ||
1972 | /* Insert this inode at the head of the on-disk orphan list... */ | |
617ba13b MC |
1973 | NEXT_ORPHAN(inode) = le32_to_cpu(EXT4_SB(sb)->s_es->s_last_orphan); |
1974 | EXT4_SB(sb)->s_es->s_last_orphan = cpu_to_le32(inode->i_ino); | |
1975 | err = ext4_journal_dirty_metadata(handle, EXT4_SB(sb)->s_sbh); | |
1976 | rc = ext4_mark_iloc_dirty(handle, inode, &iloc); | |
ac27a0ec DK |
1977 | if (!err) |
1978 | err = rc; | |
1979 | ||
1980 | /* Only add to the head of the in-memory list if all the | |
1981 | * previous operations succeeded. If the orphan_add is going to | |
1982 | * fail (possibly taking the journal offline), we can't risk | |
1983 | * leaving the inode on the orphan list: stray orphan-list | |
1984 | * entries can cause panics at unmount time. | |
1985 | * | |
1986 | * This is safe: on error we're going to ignore the orphan list | |
1987 | * anyway on the next recovery. */ | |
1988 | if (!err) | |
617ba13b | 1989 | list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan); |
ac27a0ec DK |
1990 | |
1991 | jbd_debug(4, "superblock will point to %lu\n", inode->i_ino); | |
1992 | jbd_debug(4, "orphan inode %lu will point to %d\n", | |
1993 | inode->i_ino, NEXT_ORPHAN(inode)); | |
1994 | out_unlock: | |
1995 | unlock_super(sb); | |
617ba13b | 1996 | ext4_std_error(inode->i_sb, err); |
ac27a0ec DK |
1997 | return err; |
1998 | } | |
1999 | ||
2000 | /* | |
617ba13b | 2001 | * ext4_orphan_del() removes an unlinked or truncated inode from the list |
ac27a0ec DK |
2002 | * of such inodes stored on disk, because it is finally being cleaned up. |
2003 | */ | |
617ba13b | 2004 | int ext4_orphan_del(handle_t *handle, struct inode *inode) |
ac27a0ec DK |
2005 | { |
2006 | struct list_head *prev; | |
617ba13b MC |
2007 | struct ext4_inode_info *ei = EXT4_I(inode); |
2008 | struct ext4_sb_info *sbi; | |
ac27a0ec | 2009 | unsigned long ino_next; |
617ba13b | 2010 | struct ext4_iloc iloc; |
ac27a0ec DK |
2011 | int err = 0; |
2012 | ||
2013 | lock_super(inode->i_sb); | |
2014 | if (list_empty(&ei->i_orphan)) { | |
2015 | unlock_super(inode->i_sb); | |
2016 | return 0; | |
2017 | } | |
2018 | ||
2019 | ino_next = NEXT_ORPHAN(inode); | |
2020 | prev = ei->i_orphan.prev; | |
617ba13b | 2021 | sbi = EXT4_SB(inode->i_sb); |
ac27a0ec DK |
2022 | |
2023 | jbd_debug(4, "remove inode %lu from orphan list\n", inode->i_ino); | |
2024 | ||
2025 | list_del_init(&ei->i_orphan); | |
2026 | ||
2027 | /* If we're on an error path, we may not have a valid | |
2028 | * transaction handle with which to update the orphan list on | |
2029 | * disk, but we still need to remove the inode from the linked | |
2030 | * list in memory. */ | |
2031 | if (!handle) | |
2032 | goto out; | |
2033 | ||
617ba13b | 2034 | err = ext4_reserve_inode_write(handle, inode, &iloc); |
ac27a0ec DK |
2035 | if (err) |
2036 | goto out_err; | |
2037 | ||
2038 | if (prev == &sbi->s_orphan) { | |
2039 | jbd_debug(4, "superblock will point to %lu\n", ino_next); | |
2040 | BUFFER_TRACE(sbi->s_sbh, "get_write_access"); | |
617ba13b | 2041 | err = ext4_journal_get_write_access(handle, sbi->s_sbh); |
ac27a0ec DK |
2042 | if (err) |
2043 | goto out_brelse; | |
2044 | sbi->s_es->s_last_orphan = cpu_to_le32(ino_next); | |
617ba13b | 2045 | err = ext4_journal_dirty_metadata(handle, sbi->s_sbh); |
ac27a0ec | 2046 | } else { |
617ba13b | 2047 | struct ext4_iloc iloc2; |
ac27a0ec | 2048 | struct inode *i_prev = |
617ba13b | 2049 | &list_entry(prev, struct ext4_inode_info, i_orphan)->vfs_inode; |
ac27a0ec DK |
2050 | |
2051 | jbd_debug(4, "orphan inode %lu will point to %lu\n", | |
2052 | i_prev->i_ino, ino_next); | |
617ba13b | 2053 | err = ext4_reserve_inode_write(handle, i_prev, &iloc2); |
ac27a0ec DK |
2054 | if (err) |
2055 | goto out_brelse; | |
2056 | NEXT_ORPHAN(i_prev) = ino_next; | |
617ba13b | 2057 | err = ext4_mark_iloc_dirty(handle, i_prev, &iloc2); |
ac27a0ec DK |
2058 | } |
2059 | if (err) | |
2060 | goto out_brelse; | |
2061 | NEXT_ORPHAN(inode) = 0; | |
617ba13b | 2062 | err = ext4_mark_iloc_dirty(handle, inode, &iloc); |
ac27a0ec DK |
2063 | |
2064 | out_err: | |
617ba13b | 2065 | ext4_std_error(inode->i_sb, err); |
ac27a0ec DK |
2066 | out: |
2067 | unlock_super(inode->i_sb); | |
2068 | return err; | |
2069 | ||
2070 | out_brelse: | |
2071 | brelse(iloc.bh); | |
2072 | goto out_err; | |
2073 | } | |
2074 | ||
af5bc92d | 2075 | static int ext4_rmdir(struct inode *dir, struct dentry *dentry) |
ac27a0ec DK |
2076 | { |
2077 | int retval; | |
af5bc92d TT |
2078 | struct inode *inode; |
2079 | struct buffer_head *bh; | |
2080 | struct ext4_dir_entry_2 *de; | |
ac27a0ec DK |
2081 | handle_t *handle; |
2082 | ||
2083 | /* Initialize quotas before so that eventual writes go in | |
2084 | * separate transaction */ | |
2085 | DQUOT_INIT(dentry->d_inode); | |
617ba13b | 2086 | handle = ext4_journal_start(dir, EXT4_DELETE_TRANS_BLOCKS(dir->i_sb)); |
ac27a0ec DK |
2087 | if (IS_ERR(handle)) |
2088 | return PTR_ERR(handle); | |
2089 | ||
2090 | retval = -ENOENT; | |
f702ba0f | 2091 | bh = ext4_find_entry(dir, &dentry->d_name, &de); |
ac27a0ec DK |
2092 | if (!bh) |
2093 | goto end_rmdir; | |
2094 | ||
2095 | if (IS_DIRSYNC(dir)) | |
2096 | handle->h_sync = 1; | |
2097 | ||
2098 | inode = dentry->d_inode; | |
2099 | ||
2100 | retval = -EIO; | |
2101 | if (le32_to_cpu(de->inode) != inode->i_ino) | |
2102 | goto end_rmdir; | |
2103 | ||
2104 | retval = -ENOTEMPTY; | |
af5bc92d | 2105 | if (!empty_dir(inode)) |
ac27a0ec DK |
2106 | goto end_rmdir; |
2107 | ||
617ba13b | 2108 | retval = ext4_delete_entry(handle, dir, de, bh); |
ac27a0ec DK |
2109 | if (retval) |
2110 | goto end_rmdir; | |
f8628a14 | 2111 | if (!EXT4_DIR_LINK_EMPTY(inode)) |
af5bc92d TT |
2112 | ext4_warning(inode->i_sb, "ext4_rmdir", |
2113 | "empty directory has too many links (%d)", | |
2114 | inode->i_nlink); | |
ac27a0ec DK |
2115 | inode->i_version++; |
2116 | clear_nlink(inode); | |
2117 | /* There's no need to set i_disksize: the fact that i_nlink is | |
2118 | * zero will ensure that the right thing happens during any | |
2119 | * recovery. */ | |
2120 | inode->i_size = 0; | |
617ba13b | 2121 | ext4_orphan_add(handle, inode); |
ef7f3835 | 2122 | inode->i_ctime = dir->i_ctime = dir->i_mtime = ext4_current_time(inode); |
617ba13b | 2123 | ext4_mark_inode_dirty(handle, inode); |
f8628a14 | 2124 | ext4_dec_count(handle, dir); |
617ba13b MC |
2125 | ext4_update_dx_flag(dir); |
2126 | ext4_mark_inode_dirty(handle, dir); | |
ac27a0ec DK |
2127 | |
2128 | end_rmdir: | |
617ba13b | 2129 | ext4_journal_stop(handle); |
af5bc92d | 2130 | brelse(bh); |
ac27a0ec DK |
2131 | return retval; |
2132 | } | |
2133 | ||
af5bc92d | 2134 | static int ext4_unlink(struct inode *dir, struct dentry *dentry) |
ac27a0ec DK |
2135 | { |
2136 | int retval; | |
af5bc92d TT |
2137 | struct inode *inode; |
2138 | struct buffer_head *bh; | |
2139 | struct ext4_dir_entry_2 *de; | |
ac27a0ec DK |
2140 | handle_t *handle; |
2141 | ||
2142 | /* Initialize quotas before so that eventual writes go | |
2143 | * in separate transaction */ | |
2144 | DQUOT_INIT(dentry->d_inode); | |
617ba13b | 2145 | handle = ext4_journal_start(dir, EXT4_DELETE_TRANS_BLOCKS(dir->i_sb)); |
ac27a0ec DK |
2146 | if (IS_ERR(handle)) |
2147 | return PTR_ERR(handle); | |
2148 | ||
2149 | if (IS_DIRSYNC(dir)) | |
2150 | handle->h_sync = 1; | |
2151 | ||
2152 | retval = -ENOENT; | |
f702ba0f | 2153 | bh = ext4_find_entry(dir, &dentry->d_name, &de); |
ac27a0ec DK |
2154 | if (!bh) |
2155 | goto end_unlink; | |
2156 | ||
2157 | inode = dentry->d_inode; | |
2158 | ||
2159 | retval = -EIO; | |
2160 | if (le32_to_cpu(de->inode) != inode->i_ino) | |
2161 | goto end_unlink; | |
2162 | ||
2163 | if (!inode->i_nlink) { | |
af5bc92d TT |
2164 | ext4_warning(inode->i_sb, "ext4_unlink", |
2165 | "Deleting nonexistent file (%lu), %d", | |
2166 | inode->i_ino, inode->i_nlink); | |
ac27a0ec DK |
2167 | inode->i_nlink = 1; |
2168 | } | |
617ba13b | 2169 | retval = ext4_delete_entry(handle, dir, de, bh); |
ac27a0ec DK |
2170 | if (retval) |
2171 | goto end_unlink; | |
ef7f3835 | 2172 | dir->i_ctime = dir->i_mtime = ext4_current_time(dir); |
617ba13b MC |
2173 | ext4_update_dx_flag(dir); |
2174 | ext4_mark_inode_dirty(handle, dir); | |
825f1481 | 2175 | drop_nlink(inode); |
ac27a0ec | 2176 | if (!inode->i_nlink) |
617ba13b | 2177 | ext4_orphan_add(handle, inode); |
ef7f3835 | 2178 | inode->i_ctime = ext4_current_time(inode); |
617ba13b | 2179 | ext4_mark_inode_dirty(handle, inode); |
ac27a0ec DK |
2180 | retval = 0; |
2181 | ||
2182 | end_unlink: | |
617ba13b | 2183 | ext4_journal_stop(handle); |
af5bc92d | 2184 | brelse(bh); |
ac27a0ec DK |
2185 | return retval; |
2186 | } | |
2187 | ||
af5bc92d TT |
2188 | static int ext4_symlink(struct inode *dir, |
2189 | struct dentry *dentry, const char *symname) | |
ac27a0ec DK |
2190 | { |
2191 | handle_t *handle; | |
af5bc92d | 2192 | struct inode *inode; |
ac27a0ec DK |
2193 | int l, err, retries = 0; |
2194 | ||
2195 | l = strlen(symname)+1; | |
2196 | if (l > dir->i_sb->s_blocksize) | |
2197 | return -ENAMETOOLONG; | |
2198 | ||
2199 | retry: | |
617ba13b MC |
2200 | handle = ext4_journal_start(dir, EXT4_DATA_TRANS_BLOCKS(dir->i_sb) + |
2201 | EXT4_INDEX_EXTRA_TRANS_BLOCKS + 5 + | |
2202 | 2*EXT4_QUOTA_INIT_BLOCKS(dir->i_sb)); | |
ac27a0ec DK |
2203 | if (IS_ERR(handle)) |
2204 | return PTR_ERR(handle); | |
2205 | ||
2206 | if (IS_DIRSYNC(dir)) | |
2207 | handle->h_sync = 1; | |
2208 | ||
af5bc92d | 2209 | inode = ext4_new_inode(handle, dir, S_IFLNK|S_IRWXUGO); |
ac27a0ec DK |
2210 | err = PTR_ERR(inode); |
2211 | if (IS_ERR(inode)) | |
2212 | goto out_stop; | |
2213 | ||
af5bc92d | 2214 | if (l > sizeof(EXT4_I(inode)->i_data)) { |
617ba13b MC |
2215 | inode->i_op = &ext4_symlink_inode_operations; |
2216 | ext4_set_aops(inode); | |
ac27a0ec | 2217 | /* |
617ba13b | 2218 | * page_symlink() calls into ext4_prepare/commit_write. |
ac27a0ec DK |
2219 | * We have a transaction open. All is sweetness. It also sets |
2220 | * i_size in generic_commit_write(). | |
2221 | */ | |
54566b2c | 2222 | err = __page_symlink(inode, symname, l, 1); |
ac27a0ec | 2223 | if (err) { |
825f1481 | 2224 | clear_nlink(inode); |
6b38e842 | 2225 | unlock_new_inode(inode); |
617ba13b | 2226 | ext4_mark_inode_dirty(handle, inode); |
af5bc92d | 2227 | iput(inode); |
ac27a0ec DK |
2228 | goto out_stop; |
2229 | } | |
2230 | } else { | |
e65187e6 AK |
2231 | /* clear the extent format for fast symlink */ |
2232 | EXT4_I(inode)->i_flags &= ~EXT4_EXTENTS_FL; | |
617ba13b | 2233 | inode->i_op = &ext4_fast_symlink_inode_operations; |
af5bc92d | 2234 | memcpy((char *)&EXT4_I(inode)->i_data, symname, l); |
ac27a0ec DK |
2235 | inode->i_size = l-1; |
2236 | } | |
617ba13b MC |
2237 | EXT4_I(inode)->i_disksize = inode->i_size; |
2238 | err = ext4_add_nondir(handle, dentry, inode); | |
ac27a0ec | 2239 | out_stop: |
617ba13b MC |
2240 | ext4_journal_stop(handle); |
2241 | if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries)) | |
ac27a0ec DK |
2242 | goto retry; |
2243 | return err; | |
2244 | } | |
2245 | ||
af5bc92d TT |
2246 | static int ext4_link(struct dentry *old_dentry, |
2247 | struct inode *dir, struct dentry *dentry) | |
ac27a0ec DK |
2248 | { |
2249 | handle_t *handle; | |
2250 | struct inode *inode = old_dentry->d_inode; | |
2251 | int err, retries = 0; | |
2252 | ||
f8628a14 | 2253 | if (EXT4_DIR_LINK_MAX(inode)) |
ac27a0ec | 2254 | return -EMLINK; |
f8628a14 | 2255 | |
2988a774 ES |
2256 | /* |
2257 | * Return -ENOENT if we've raced with unlink and i_nlink is 0. Doing | |
2258 | * otherwise has the potential to corrupt the orphan inode list. | |
2259 | */ | |
2260 | if (inode->i_nlink == 0) | |
2261 | return -ENOENT; | |
ac27a0ec DK |
2262 | |
2263 | retry: | |
617ba13b MC |
2264 | handle = ext4_journal_start(dir, EXT4_DATA_TRANS_BLOCKS(dir->i_sb) + |
2265 | EXT4_INDEX_EXTRA_TRANS_BLOCKS); | |
ac27a0ec DK |
2266 | if (IS_ERR(handle)) |
2267 | return PTR_ERR(handle); | |
2268 | ||
2269 | if (IS_DIRSYNC(dir)) | |
2270 | handle->h_sync = 1; | |
2271 | ||
ef7f3835 | 2272 | inode->i_ctime = ext4_current_time(inode); |
f8628a14 | 2273 | ext4_inc_count(handle, inode); |
ac27a0ec DK |
2274 | atomic_inc(&inode->i_count); |
2275 | ||
6b38e842 AV |
2276 | err = ext4_add_entry(handle, dentry, inode); |
2277 | if (!err) { | |
2278 | ext4_mark_inode_dirty(handle, inode); | |
2279 | d_instantiate(dentry, inode); | |
2280 | } else { | |
2281 | drop_nlink(inode); | |
2282 | iput(inode); | |
2283 | } | |
617ba13b MC |
2284 | ext4_journal_stop(handle); |
2285 | if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries)) | |
ac27a0ec DK |
2286 | goto retry; |
2287 | return err; | |
2288 | } | |
2289 | ||
2290 | #define PARENT_INO(buffer) \ | |
a72d7f83 | 2291 | (ext4_next_entry((struct ext4_dir_entry_2 *)(buffer))->inode) |
ac27a0ec DK |
2292 | |
2293 | /* | |
2294 | * Anybody can rename anything with this: the permission checks are left to the | |
2295 | * higher-level routines. | |
2296 | */ | |
af5bc92d TT |
2297 | static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry, |
2298 | struct inode *new_dir, struct dentry *new_dentry) | |
ac27a0ec DK |
2299 | { |
2300 | handle_t *handle; | |
af5bc92d TT |
2301 | struct inode *old_inode, *new_inode; |
2302 | struct buffer_head *old_bh, *new_bh, *dir_bh; | |
2303 | struct ext4_dir_entry_2 *old_de, *new_de; | |
ac27a0ec DK |
2304 | int retval; |
2305 | ||
2306 | old_bh = new_bh = dir_bh = NULL; | |
2307 | ||
2308 | /* Initialize quotas before so that eventual writes go | |
2309 | * in separate transaction */ | |
2310 | if (new_dentry->d_inode) | |
2311 | DQUOT_INIT(new_dentry->d_inode); | |
617ba13b MC |
2312 | handle = ext4_journal_start(old_dir, 2 * |
2313 | EXT4_DATA_TRANS_BLOCKS(old_dir->i_sb) + | |
2314 | EXT4_INDEX_EXTRA_TRANS_BLOCKS + 2); | |
ac27a0ec DK |
2315 | if (IS_ERR(handle)) |
2316 | return PTR_ERR(handle); | |
2317 | ||
2318 | if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir)) | |
2319 | handle->h_sync = 1; | |
2320 | ||
f702ba0f | 2321 | old_bh = ext4_find_entry(old_dir, &old_dentry->d_name, &old_de); |
ac27a0ec DK |
2322 | /* |
2323 | * Check for inode number is _not_ due to possible IO errors. | |
2324 | * We might rmdir the source, keep it as pwd of some process | |
2325 | * and merrily kill the link to whatever was created under the | |
2326 | * same name. Goodbye sticky bit ;-< | |
2327 | */ | |
2328 | old_inode = old_dentry->d_inode; | |
2329 | retval = -ENOENT; | |
2330 | if (!old_bh || le32_to_cpu(old_de->inode) != old_inode->i_ino) | |
2331 | goto end_rename; | |
2332 | ||
2333 | new_inode = new_dentry->d_inode; | |
f702ba0f | 2334 | new_bh = ext4_find_entry(new_dir, &new_dentry->d_name, &new_de); |
ac27a0ec DK |
2335 | if (new_bh) { |
2336 | if (!new_inode) { | |
af5bc92d | 2337 | brelse(new_bh); |
ac27a0ec DK |
2338 | new_bh = NULL; |
2339 | } | |
2340 | } | |
2341 | if (S_ISDIR(old_inode->i_mode)) { | |
2342 | if (new_inode) { | |
2343 | retval = -ENOTEMPTY; | |
af5bc92d | 2344 | if (!empty_dir(new_inode)) |
ac27a0ec DK |
2345 | goto end_rename; |
2346 | } | |
2347 | retval = -EIO; | |
af5bc92d | 2348 | dir_bh = ext4_bread(handle, old_inode, 0, 0, &retval); |
ac27a0ec DK |
2349 | if (!dir_bh) |
2350 | goto end_rename; | |
2351 | if (le32_to_cpu(PARENT_INO(dir_bh->b_data)) != old_dir->i_ino) | |
2352 | goto end_rename; | |
2353 | retval = -EMLINK; | |
af5bc92d | 2354 | if (!new_inode && new_dir != old_dir && |
617ba13b | 2355 | new_dir->i_nlink >= EXT4_LINK_MAX) |
ac27a0ec DK |
2356 | goto end_rename; |
2357 | } | |
2358 | if (!new_bh) { | |
af5bc92d | 2359 | retval = ext4_add_entry(handle, new_dentry, old_inode); |
ac27a0ec DK |
2360 | if (retval) |
2361 | goto end_rename; | |
2362 | } else { | |
2363 | BUFFER_TRACE(new_bh, "get write access"); | |
617ba13b | 2364 | ext4_journal_get_write_access(handle, new_bh); |
ac27a0ec | 2365 | new_de->inode = cpu_to_le32(old_inode->i_ino); |
617ba13b MC |
2366 | if (EXT4_HAS_INCOMPAT_FEATURE(new_dir->i_sb, |
2367 | EXT4_FEATURE_INCOMPAT_FILETYPE)) | |
ac27a0ec DK |
2368 | new_de->file_type = old_de->file_type; |
2369 | new_dir->i_version++; | |
53b7e9f6 JK |
2370 | new_dir->i_ctime = new_dir->i_mtime = |
2371 | ext4_current_time(new_dir); | |
2372 | ext4_mark_inode_dirty(handle, new_dir); | |
617ba13b MC |
2373 | BUFFER_TRACE(new_bh, "call ext4_journal_dirty_metadata"); |
2374 | ext4_journal_dirty_metadata(handle, new_bh); | |
ac27a0ec DK |
2375 | brelse(new_bh); |
2376 | new_bh = NULL; | |
2377 | } | |
2378 | ||
2379 | /* | |
2380 | * Like most other Unix systems, set the ctime for inodes on a | |
2381 | * rename. | |
2382 | */ | |
ef7f3835 | 2383 | old_inode->i_ctime = ext4_current_time(old_inode); |
617ba13b | 2384 | ext4_mark_inode_dirty(handle, old_inode); |
ac27a0ec DK |
2385 | |
2386 | /* | |
2387 | * ok, that's it | |
2388 | */ | |
2389 | if (le32_to_cpu(old_de->inode) != old_inode->i_ino || | |
2390 | old_de->name_len != old_dentry->d_name.len || | |
2391 | strncmp(old_de->name, old_dentry->d_name.name, old_de->name_len) || | |
617ba13b | 2392 | (retval = ext4_delete_entry(handle, old_dir, |
ac27a0ec DK |
2393 | old_de, old_bh)) == -ENOENT) { |
2394 | /* old_de could have moved from under us during htree split, so | |
2395 | * make sure that we are deleting the right entry. We might | |
2396 | * also be pointing to a stale entry in the unused part of | |
2397 | * old_bh so just checking inum and the name isn't enough. */ | |
2398 | struct buffer_head *old_bh2; | |
617ba13b | 2399 | struct ext4_dir_entry_2 *old_de2; |
ac27a0ec | 2400 | |
f702ba0f | 2401 | old_bh2 = ext4_find_entry(old_dir, &old_dentry->d_name, &old_de2); |
ac27a0ec | 2402 | if (old_bh2) { |
617ba13b | 2403 | retval = ext4_delete_entry(handle, old_dir, |
ac27a0ec DK |
2404 | old_de2, old_bh2); |
2405 | brelse(old_bh2); | |
2406 | } | |
2407 | } | |
2408 | if (retval) { | |
617ba13b | 2409 | ext4_warning(old_dir->i_sb, "ext4_rename", |
ac27a0ec DK |
2410 | "Deleting old file (%lu), %d, error=%d", |
2411 | old_dir->i_ino, old_dir->i_nlink, retval); | |
2412 | } | |
2413 | ||
2414 | if (new_inode) { | |
f8628a14 | 2415 | ext4_dec_count(handle, new_inode); |
ef7f3835 | 2416 | new_inode->i_ctime = ext4_current_time(new_inode); |
ac27a0ec | 2417 | } |
ef7f3835 | 2418 | old_dir->i_ctime = old_dir->i_mtime = ext4_current_time(old_dir); |
617ba13b | 2419 | ext4_update_dx_flag(old_dir); |
ac27a0ec DK |
2420 | if (dir_bh) { |
2421 | BUFFER_TRACE(dir_bh, "get_write_access"); | |
617ba13b | 2422 | ext4_journal_get_write_access(handle, dir_bh); |
ac27a0ec | 2423 | PARENT_INO(dir_bh->b_data) = cpu_to_le32(new_dir->i_ino); |
617ba13b MC |
2424 | BUFFER_TRACE(dir_bh, "call ext4_journal_dirty_metadata"); |
2425 | ext4_journal_dirty_metadata(handle, dir_bh); | |
f8628a14 | 2426 | ext4_dec_count(handle, old_dir); |
ac27a0ec | 2427 | if (new_inode) { |
f8628a14 | 2428 | /* checked empty_dir above, can't have another parent, |
825f1481 | 2429 | * ext4_dec_count() won't work for many-linked dirs */ |
f8628a14 | 2430 | new_inode->i_nlink = 0; |
ac27a0ec | 2431 | } else { |
f8628a14 | 2432 | ext4_inc_count(handle, new_dir); |
617ba13b MC |
2433 | ext4_update_dx_flag(new_dir); |
2434 | ext4_mark_inode_dirty(handle, new_dir); | |
ac27a0ec DK |
2435 | } |
2436 | } | |
617ba13b | 2437 | ext4_mark_inode_dirty(handle, old_dir); |
ac27a0ec | 2438 | if (new_inode) { |
617ba13b | 2439 | ext4_mark_inode_dirty(handle, new_inode); |
ac27a0ec | 2440 | if (!new_inode->i_nlink) |
617ba13b | 2441 | ext4_orphan_add(handle, new_inode); |
ac27a0ec DK |
2442 | } |
2443 | retval = 0; | |
2444 | ||
2445 | end_rename: | |
af5bc92d TT |
2446 | brelse(dir_bh); |
2447 | brelse(old_bh); | |
2448 | brelse(new_bh); | |
617ba13b | 2449 | ext4_journal_stop(handle); |
ac27a0ec DK |
2450 | return retval; |
2451 | } | |
2452 | ||
2453 | /* | |
2454 | * directories can handle most operations... | |
2455 | */ | |
754661f1 | 2456 | const struct inode_operations ext4_dir_inode_operations = { |
617ba13b MC |
2457 | .create = ext4_create, |
2458 | .lookup = ext4_lookup, | |
2459 | .link = ext4_link, | |
2460 | .unlink = ext4_unlink, | |
2461 | .symlink = ext4_symlink, | |
2462 | .mkdir = ext4_mkdir, | |
2463 | .rmdir = ext4_rmdir, | |
2464 | .mknod = ext4_mknod, | |
2465 | .rename = ext4_rename, | |
2466 | .setattr = ext4_setattr, | |
03010a33 | 2467 | #ifdef CONFIG_EXT4_FS_XATTR |
ac27a0ec DK |
2468 | .setxattr = generic_setxattr, |
2469 | .getxattr = generic_getxattr, | |
617ba13b | 2470 | .listxattr = ext4_listxattr, |
ac27a0ec DK |
2471 | .removexattr = generic_removexattr, |
2472 | #endif | |
617ba13b | 2473 | .permission = ext4_permission, |
ac27a0ec DK |
2474 | }; |
2475 | ||
754661f1 | 2476 | const struct inode_operations ext4_special_inode_operations = { |
617ba13b | 2477 | .setattr = ext4_setattr, |
03010a33 | 2478 | #ifdef CONFIG_EXT4_FS_XATTR |
ac27a0ec DK |
2479 | .setxattr = generic_setxattr, |
2480 | .getxattr = generic_getxattr, | |
617ba13b | 2481 | .listxattr = ext4_listxattr, |
ac27a0ec DK |
2482 | .removexattr = generic_removexattr, |
2483 | #endif | |
617ba13b | 2484 | .permission = ext4_permission, |
ac27a0ec | 2485 | }; |