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> | |
ac27a0ec | 29 | #include <linux/time.h> |
ac27a0ec DK |
30 | #include <linux/fcntl.h> |
31 | #include <linux/stat.h> | |
32 | #include <linux/string.h> | |
33 | #include <linux/quotaops.h> | |
34 | #include <linux/buffer_head.h> | |
35 | #include <linux/bio.h> | |
3dcf5451 CH |
36 | #include "ext4.h" |
37 | #include "ext4_jbd2.h" | |
ac27a0ec | 38 | |
ac27a0ec DK |
39 | #include "xattr.h" |
40 | #include "acl.h" | |
41 | ||
0562e0ba | 42 | #include <trace/events/ext4.h> |
ac27a0ec DK |
43 | /* |
44 | * define how far ahead to read directories while searching them. | |
45 | */ | |
46 | #define NAMEI_RA_CHUNKS 2 | |
47 | #define NAMEI_RA_BLOCKS 4 | |
8c55e204 | 48 | #define NAMEI_RA_SIZE (NAMEI_RA_CHUNKS * NAMEI_RA_BLOCKS) |
ac27a0ec | 49 | |
617ba13b | 50 | static struct buffer_head *ext4_append(handle_t *handle, |
ac27a0ec | 51 | struct inode *inode, |
0f70b406 | 52 | ext4_lblk_t *block) |
ac27a0ec DK |
53 | { |
54 | struct buffer_head *bh; | |
1c215028 | 55 | int err; |
ac27a0ec | 56 | |
df981d03 TT |
57 | if (unlikely(EXT4_SB(inode->i_sb)->s_max_dir_size_kb && |
58 | ((inode->i_size >> 10) >= | |
0f70b406 TT |
59 | EXT4_SB(inode->i_sb)->s_max_dir_size_kb))) |
60 | return ERR_PTR(-ENOSPC); | |
df981d03 | 61 | |
ac27a0ec DK |
62 | *block = inode->i_size >> inode->i_sb->s_blocksize_bits; |
63 | ||
c5e298ae | 64 | bh = ext4_bread(handle, inode, *block, EXT4_GET_BLOCKS_CREATE); |
1c215028 TT |
65 | if (IS_ERR(bh)) |
66 | return bh; | |
0f70b406 TT |
67 | inode->i_size += inode->i_sb->s_blocksize; |
68 | EXT4_I(inode)->i_disksize = inode->i_size; | |
5d601255 | 69 | BUFFER_TRACE(bh, "get_write_access"); |
0f70b406 TT |
70 | err = ext4_journal_get_write_access(handle, bh); |
71 | if (err) { | |
72 | brelse(bh); | |
73 | ext4_std_error(inode->i_sb, err); | |
74 | return ERR_PTR(err); | |
6d1ab10e | 75 | } |
ac27a0ec DK |
76 | return bh; |
77 | } | |
78 | ||
dc6982ff TT |
79 | static int ext4_dx_csum_verify(struct inode *inode, |
80 | struct ext4_dir_entry *dirent); | |
81 | ||
82 | typedef enum { | |
83 | EITHER, INDEX, DIRENT | |
84 | } dirblock_type_t; | |
85 | ||
86 | #define ext4_read_dirblock(inode, block, type) \ | |
b03a2f7e | 87 | __ext4_read_dirblock((inode), (block), (type), __func__, __LINE__) |
dc6982ff TT |
88 | |
89 | static struct buffer_head *__ext4_read_dirblock(struct inode *inode, | |
b03a2f7e AD |
90 | ext4_lblk_t block, |
91 | dirblock_type_t type, | |
92 | const char *func, | |
93 | unsigned int line) | |
dc6982ff TT |
94 | { |
95 | struct buffer_head *bh; | |
96 | struct ext4_dir_entry *dirent; | |
1c215028 | 97 | int is_dx_block = 0; |
dc6982ff | 98 | |
1c215028 TT |
99 | bh = ext4_bread(NULL, inode, block, 0); |
100 | if (IS_ERR(bh)) { | |
b03a2f7e AD |
101 | __ext4_warning(inode->i_sb, func, line, |
102 | "inode #%lu: lblock %lu: comm %s: " | |
103 | "error %ld reading directory block", | |
104 | inode->i_ino, (unsigned long)block, | |
105 | current->comm, PTR_ERR(bh)); | |
1c215028 TT |
106 | |
107 | return bh; | |
108 | } | |
109 | if (!bh) { | |
b03a2f7e AD |
110 | ext4_error_inode(inode, func, line, block, |
111 | "Directory hole found"); | |
6a797d27 | 112 | return ERR_PTR(-EFSCORRUPTED); |
dc6982ff TT |
113 | } |
114 | dirent = (struct ext4_dir_entry *) bh->b_data; | |
115 | /* Determine whether or not we have an index block */ | |
116 | if (is_dx(inode)) { | |
117 | if (block == 0) | |
118 | is_dx_block = 1; | |
119 | else if (ext4_rec_len_from_disk(dirent->rec_len, | |
120 | inode->i_sb->s_blocksize) == | |
121 | inode->i_sb->s_blocksize) | |
122 | is_dx_block = 1; | |
123 | } | |
124 | if (!is_dx_block && type == INDEX) { | |
b03a2f7e | 125 | ext4_error_inode(inode, func, line, block, |
dc6982ff | 126 | "directory leaf block found instead of index block"); |
6a797d27 | 127 | return ERR_PTR(-EFSCORRUPTED); |
dc6982ff | 128 | } |
9aa5d32b | 129 | if (!ext4_has_metadata_csum(inode->i_sb) || |
dc6982ff TT |
130 | buffer_verified(bh)) |
131 | return bh; | |
132 | ||
133 | /* | |
134 | * An empty leaf block can get mistaken for a index block; for | |
135 | * this reason, we can only check the index checksum when the | |
136 | * caller is sure it should be an index block. | |
137 | */ | |
138 | if (is_dx_block && type == INDEX) { | |
139 | if (ext4_dx_csum_verify(inode, dirent)) | |
140 | set_buffer_verified(bh); | |
141 | else { | |
b03a2f7e AD |
142 | ext4_error_inode(inode, func, line, block, |
143 | "Directory index failed checksum"); | |
a871611b | 144 | brelse(bh); |
6a797d27 | 145 | return ERR_PTR(-EFSBADCRC); |
a871611b | 146 | } |
ac27a0ec | 147 | } |
dc6982ff TT |
148 | if (!is_dx_block) { |
149 | if (ext4_dirent_csum_verify(inode, dirent)) | |
150 | set_buffer_verified(bh); | |
151 | else { | |
b03a2f7e AD |
152 | ext4_error_inode(inode, func, line, block, |
153 | "Directory block failed checksum"); | |
dc6982ff | 154 | brelse(bh); |
6a797d27 | 155 | return ERR_PTR(-EFSBADCRC); |
dc6982ff | 156 | } |
6d1ab10e | 157 | } |
ac27a0ec DK |
158 | return bh; |
159 | } | |
160 | ||
161 | #ifndef assert | |
162 | #define assert(test) J_ASSERT(test) | |
163 | #endif | |
164 | ||
ac27a0ec DK |
165 | #ifdef DX_DEBUG |
166 | #define dxtrace(command) command | |
167 | #else | |
168 | #define dxtrace(command) | |
169 | #endif | |
170 | ||
171 | struct fake_dirent | |
172 | { | |
173 | __le32 inode; | |
174 | __le16 rec_len; | |
175 | u8 name_len; | |
176 | u8 file_type; | |
177 | }; | |
178 | ||
179 | struct dx_countlimit | |
180 | { | |
181 | __le16 limit; | |
182 | __le16 count; | |
183 | }; | |
184 | ||
185 | struct dx_entry | |
186 | { | |
187 | __le32 hash; | |
188 | __le32 block; | |
189 | }; | |
190 | ||
191 | /* | |
192 | * dx_root_info is laid out so that if it should somehow get overlaid by a | |
193 | * dirent the two low bits of the hash version will be zero. Therefore, the | |
194 | * hash version mod 4 should never be 0. Sincerely, the paranoia department. | |
195 | */ | |
196 | ||
197 | struct dx_root | |
198 | { | |
199 | struct fake_dirent dot; | |
200 | char dot_name[4]; | |
201 | struct fake_dirent dotdot; | |
202 | char dotdot_name[4]; | |
203 | struct dx_root_info | |
204 | { | |
205 | __le32 reserved_zero; | |
206 | u8 hash_version; | |
207 | u8 info_length; /* 8 */ | |
208 | u8 indirect_levels; | |
209 | u8 unused_flags; | |
210 | } | |
211 | info; | |
212 | struct dx_entry entries[0]; | |
213 | }; | |
214 | ||
215 | struct dx_node | |
216 | { | |
217 | struct fake_dirent fake; | |
218 | struct dx_entry entries[0]; | |
219 | }; | |
220 | ||
221 | ||
222 | struct dx_frame | |
223 | { | |
224 | struct buffer_head *bh; | |
225 | struct dx_entry *entries; | |
226 | struct dx_entry *at; | |
227 | }; | |
228 | ||
229 | struct dx_map_entry | |
230 | { | |
231 | u32 hash; | |
ef2b02d3 ES |
232 | u16 offs; |
233 | u16 size; | |
ac27a0ec DK |
234 | }; |
235 | ||
e6153918 DW |
236 | /* |
237 | * This goes at the end of each htree block. | |
238 | */ | |
239 | struct dx_tail { | |
240 | u32 dt_reserved; | |
241 | __le32 dt_checksum; /* crc32c(uuid+inum+dirblock) */ | |
242 | }; | |
243 | ||
725d26d3 AK |
244 | static inline ext4_lblk_t dx_get_block(struct dx_entry *entry); |
245 | static void dx_set_block(struct dx_entry *entry, ext4_lblk_t value); | |
af5bc92d TT |
246 | static inline unsigned dx_get_hash(struct dx_entry *entry); |
247 | static void dx_set_hash(struct dx_entry *entry, unsigned value); | |
248 | static unsigned dx_get_count(struct dx_entry *entries); | |
249 | static unsigned dx_get_limit(struct dx_entry *entries); | |
250 | static void dx_set_count(struct dx_entry *entries, unsigned value); | |
251 | static void dx_set_limit(struct dx_entry *entries, unsigned value); | |
252 | static unsigned dx_root_limit(struct inode *dir, unsigned infosize); | |
253 | static unsigned dx_node_limit(struct inode *dir); | |
5b643f9c | 254 | static struct dx_frame *dx_probe(struct ext4_filename *fname, |
ac27a0ec DK |
255 | struct inode *dir, |
256 | struct dx_hash_info *hinfo, | |
dd73b5d5 | 257 | struct dx_frame *frame); |
af5bc92d | 258 | static void dx_release(struct dx_frame *frames); |
1f3862b5 MH |
259 | static int dx_make_map(struct inode *dir, struct ext4_dir_entry_2 *de, |
260 | unsigned blocksize, struct dx_hash_info *hinfo, | |
261 | struct dx_map_entry map[]); | |
ac27a0ec | 262 | static void dx_sort_map(struct dx_map_entry *map, unsigned count); |
af5bc92d | 263 | static struct ext4_dir_entry_2 *dx_move_dirents(char *from, char *to, |
3d0518f4 | 264 | struct dx_map_entry *offsets, int count, unsigned blocksize); |
8bad4597 | 265 | static struct ext4_dir_entry_2* dx_pack_dirents(char *base, unsigned blocksize); |
725d26d3 AK |
266 | static void dx_insert_block(struct dx_frame *frame, |
267 | u32 hash, ext4_lblk_t block); | |
617ba13b | 268 | static int ext4_htree_next_block(struct inode *dir, __u32 hash, |
ac27a0ec DK |
269 | struct dx_frame *frame, |
270 | struct dx_frame *frames, | |
271 | __u32 *start_hash); | |
f702ba0f | 272 | static struct buffer_head * ext4_dx_find_entry(struct inode *dir, |
5b643f9c | 273 | struct ext4_filename *fname, |
537d8f93 | 274 | struct ext4_dir_entry_2 **res_dir); |
5b643f9c | 275 | static int ext4_dx_add_entry(handle_t *handle, struct ext4_filename *fname, |
56a04915 | 276 | struct inode *dir, struct inode *inode); |
ac27a0ec | 277 | |
dbe89444 | 278 | /* checksumming functions */ |
3c47d541 TM |
279 | void initialize_dirent_tail(struct ext4_dir_entry_tail *t, |
280 | unsigned int blocksize) | |
b0336e8d DW |
281 | { |
282 | memset(t, 0, sizeof(struct ext4_dir_entry_tail)); | |
283 | t->det_rec_len = ext4_rec_len_to_disk( | |
284 | sizeof(struct ext4_dir_entry_tail), blocksize); | |
285 | t->det_reserved_ft = EXT4_FT_DIR_CSUM; | |
286 | } | |
287 | ||
288 | /* Walk through a dirent block to find a checksum "dirent" at the tail */ | |
289 | static struct ext4_dir_entry_tail *get_dirent_tail(struct inode *inode, | |
290 | struct ext4_dir_entry *de) | |
291 | { | |
292 | struct ext4_dir_entry_tail *t; | |
293 | ||
294 | #ifdef PARANOID | |
295 | struct ext4_dir_entry *d, *top; | |
296 | ||
297 | d = de; | |
298 | top = (struct ext4_dir_entry *)(((void *)de) + | |
299 | (EXT4_BLOCK_SIZE(inode->i_sb) - | |
300 | sizeof(struct ext4_dir_entry_tail))); | |
301 | while (d < top && d->rec_len) | |
302 | d = (struct ext4_dir_entry *)(((void *)d) + | |
303 | le16_to_cpu(d->rec_len)); | |
304 | ||
305 | if (d != top) | |
306 | return NULL; | |
307 | ||
308 | t = (struct ext4_dir_entry_tail *)d; | |
309 | #else | |
310 | t = EXT4_DIRENT_TAIL(de, EXT4_BLOCK_SIZE(inode->i_sb)); | |
311 | #endif | |
312 | ||
313 | if (t->det_reserved_zero1 || | |
314 | le16_to_cpu(t->det_rec_len) != sizeof(struct ext4_dir_entry_tail) || | |
315 | t->det_reserved_zero2 || | |
316 | t->det_reserved_ft != EXT4_FT_DIR_CSUM) | |
317 | return NULL; | |
318 | ||
319 | return t; | |
320 | } | |
321 | ||
322 | static __le32 ext4_dirent_csum(struct inode *inode, | |
323 | struct ext4_dir_entry *dirent, int size) | |
324 | { | |
325 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
326 | struct ext4_inode_info *ei = EXT4_I(inode); | |
327 | __u32 csum; | |
328 | ||
329 | csum = ext4_chksum(sbi, ei->i_csum_seed, (__u8 *)dirent, size); | |
330 | return cpu_to_le32(csum); | |
331 | } | |
332 | ||
b03a2f7e AD |
333 | #define warn_no_space_for_csum(inode) \ |
334 | __warn_no_space_for_csum((inode), __func__, __LINE__) | |
335 | ||
336 | static void __warn_no_space_for_csum(struct inode *inode, const char *func, | |
337 | unsigned int line) | |
dffe9d8d | 338 | { |
b03a2f7e AD |
339 | __ext4_warning_inode(inode, func, line, |
340 | "No space for directory leaf checksum. Please run e2fsck -D."); | |
dffe9d8d TT |
341 | } |
342 | ||
b0336e8d DW |
343 | int ext4_dirent_csum_verify(struct inode *inode, struct ext4_dir_entry *dirent) |
344 | { | |
345 | struct ext4_dir_entry_tail *t; | |
346 | ||
9aa5d32b | 347 | if (!ext4_has_metadata_csum(inode->i_sb)) |
b0336e8d DW |
348 | return 1; |
349 | ||
350 | t = get_dirent_tail(inode, dirent); | |
351 | if (!t) { | |
dffe9d8d | 352 | warn_no_space_for_csum(inode); |
b0336e8d DW |
353 | return 0; |
354 | } | |
355 | ||
356 | if (t->det_checksum != ext4_dirent_csum(inode, dirent, | |
357 | (void *)t - (void *)dirent)) | |
358 | return 0; | |
359 | ||
360 | return 1; | |
361 | } | |
362 | ||
363 | static void ext4_dirent_csum_set(struct inode *inode, | |
364 | struct ext4_dir_entry *dirent) | |
365 | { | |
366 | struct ext4_dir_entry_tail *t; | |
367 | ||
9aa5d32b | 368 | if (!ext4_has_metadata_csum(inode->i_sb)) |
b0336e8d DW |
369 | return; |
370 | ||
371 | t = get_dirent_tail(inode, dirent); | |
372 | if (!t) { | |
dffe9d8d | 373 | warn_no_space_for_csum(inode); |
b0336e8d DW |
374 | return; |
375 | } | |
376 | ||
377 | t->det_checksum = ext4_dirent_csum(inode, dirent, | |
378 | (void *)t - (void *)dirent); | |
379 | } | |
380 | ||
3c47d541 TM |
381 | int ext4_handle_dirty_dirent_node(handle_t *handle, |
382 | struct inode *inode, | |
383 | struct buffer_head *bh) | |
b0336e8d DW |
384 | { |
385 | ext4_dirent_csum_set(inode, (struct ext4_dir_entry *)bh->b_data); | |
386 | return ext4_handle_dirty_metadata(handle, inode, bh); | |
387 | } | |
388 | ||
dbe89444 DW |
389 | static struct dx_countlimit *get_dx_countlimit(struct inode *inode, |
390 | struct ext4_dir_entry *dirent, | |
391 | int *offset) | |
392 | { | |
393 | struct ext4_dir_entry *dp; | |
394 | struct dx_root_info *root; | |
395 | int count_offset; | |
396 | ||
397 | if (le16_to_cpu(dirent->rec_len) == EXT4_BLOCK_SIZE(inode->i_sb)) | |
398 | count_offset = 8; | |
399 | else if (le16_to_cpu(dirent->rec_len) == 12) { | |
400 | dp = (struct ext4_dir_entry *)(((void *)dirent) + 12); | |
401 | if (le16_to_cpu(dp->rec_len) != | |
402 | EXT4_BLOCK_SIZE(inode->i_sb) - 12) | |
403 | return NULL; | |
404 | root = (struct dx_root_info *)(((void *)dp + 12)); | |
405 | if (root->reserved_zero || | |
406 | root->info_length != sizeof(struct dx_root_info)) | |
407 | return NULL; | |
408 | count_offset = 32; | |
409 | } else | |
410 | return NULL; | |
411 | ||
412 | if (offset) | |
413 | *offset = count_offset; | |
414 | return (struct dx_countlimit *)(((void *)dirent) + count_offset); | |
415 | } | |
416 | ||
417 | static __le32 ext4_dx_csum(struct inode *inode, struct ext4_dir_entry *dirent, | |
418 | int count_offset, int count, struct dx_tail *t) | |
419 | { | |
420 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
421 | struct ext4_inode_info *ei = EXT4_I(inode); | |
d6a77105 | 422 | __u32 csum; |
dbe89444 | 423 | int size; |
b47820ed DJ |
424 | __u32 dummy_csum = 0; |
425 | int offset = offsetof(struct dx_tail, dt_checksum); | |
dbe89444 DW |
426 | |
427 | size = count_offset + (count * sizeof(struct dx_entry)); | |
dbe89444 | 428 | csum = ext4_chksum(sbi, ei->i_csum_seed, (__u8 *)dirent, size); |
b47820ed DJ |
429 | csum = ext4_chksum(sbi, csum, (__u8 *)t, offset); |
430 | csum = ext4_chksum(sbi, csum, (__u8 *)&dummy_csum, sizeof(dummy_csum)); | |
dbe89444 DW |
431 | |
432 | return cpu_to_le32(csum); | |
433 | } | |
434 | ||
435 | static int ext4_dx_csum_verify(struct inode *inode, | |
436 | struct ext4_dir_entry *dirent) | |
437 | { | |
438 | struct dx_countlimit *c; | |
439 | struct dx_tail *t; | |
440 | int count_offset, limit, count; | |
441 | ||
9aa5d32b | 442 | if (!ext4_has_metadata_csum(inode->i_sb)) |
dbe89444 DW |
443 | return 1; |
444 | ||
445 | c = get_dx_countlimit(inode, dirent, &count_offset); | |
446 | if (!c) { | |
447 | EXT4_ERROR_INODE(inode, "dir seems corrupt? Run e2fsck -D."); | |
fa964540 | 448 | return 0; |
dbe89444 DW |
449 | } |
450 | limit = le16_to_cpu(c->limit); | |
451 | count = le16_to_cpu(c->count); | |
452 | if (count_offset + (limit * sizeof(struct dx_entry)) > | |
453 | EXT4_BLOCK_SIZE(inode->i_sb) - sizeof(struct dx_tail)) { | |
dffe9d8d | 454 | warn_no_space_for_csum(inode); |
fa964540 | 455 | return 0; |
dbe89444 DW |
456 | } |
457 | t = (struct dx_tail *)(((struct dx_entry *)c) + limit); | |
458 | ||
459 | if (t->dt_checksum != ext4_dx_csum(inode, dirent, count_offset, | |
460 | count, t)) | |
461 | return 0; | |
462 | return 1; | |
463 | } | |
464 | ||
465 | static void ext4_dx_csum_set(struct inode *inode, struct ext4_dir_entry *dirent) | |
466 | { | |
467 | struct dx_countlimit *c; | |
468 | struct dx_tail *t; | |
469 | int count_offset, limit, count; | |
470 | ||
9aa5d32b | 471 | if (!ext4_has_metadata_csum(inode->i_sb)) |
dbe89444 DW |
472 | return; |
473 | ||
474 | c = get_dx_countlimit(inode, dirent, &count_offset); | |
475 | if (!c) { | |
476 | EXT4_ERROR_INODE(inode, "dir seems corrupt? Run e2fsck -D."); | |
477 | return; | |
478 | } | |
479 | limit = le16_to_cpu(c->limit); | |
480 | count = le16_to_cpu(c->count); | |
481 | if (count_offset + (limit * sizeof(struct dx_entry)) > | |
482 | EXT4_BLOCK_SIZE(inode->i_sb) - sizeof(struct dx_tail)) { | |
dffe9d8d | 483 | warn_no_space_for_csum(inode); |
dbe89444 DW |
484 | return; |
485 | } | |
486 | t = (struct dx_tail *)(((struct dx_entry *)c) + limit); | |
487 | ||
488 | t->dt_checksum = ext4_dx_csum(inode, dirent, count_offset, count, t); | |
489 | } | |
490 | ||
491 | static inline int ext4_handle_dirty_dx_node(handle_t *handle, | |
492 | struct inode *inode, | |
493 | struct buffer_head *bh) | |
494 | { | |
495 | ext4_dx_csum_set(inode, (struct ext4_dir_entry *)bh->b_data); | |
496 | return ext4_handle_dirty_metadata(handle, inode, bh); | |
497 | } | |
498 | ||
f795e140 LZ |
499 | /* |
500 | * p is at least 6 bytes before the end of page | |
501 | */ | |
502 | static inline struct ext4_dir_entry_2 * | |
3d0518f4 | 503 | ext4_next_entry(struct ext4_dir_entry_2 *p, unsigned long blocksize) |
f795e140 LZ |
504 | { |
505 | return (struct ext4_dir_entry_2 *)((char *)p + | |
3d0518f4 | 506 | ext4_rec_len_from_disk(p->rec_len, blocksize)); |
f795e140 LZ |
507 | } |
508 | ||
ac27a0ec DK |
509 | /* |
510 | * Future: use high four bits of block for coalesce-on-delete flags | |
511 | * Mask them off for now. | |
512 | */ | |
513 | ||
725d26d3 | 514 | static inline ext4_lblk_t dx_get_block(struct dx_entry *entry) |
ac27a0ec DK |
515 | { |
516 | return le32_to_cpu(entry->block) & 0x00ffffff; | |
517 | } | |
518 | ||
725d26d3 | 519 | static inline void dx_set_block(struct dx_entry *entry, ext4_lblk_t value) |
ac27a0ec DK |
520 | { |
521 | entry->block = cpu_to_le32(value); | |
522 | } | |
523 | ||
af5bc92d | 524 | static inline unsigned dx_get_hash(struct dx_entry *entry) |
ac27a0ec DK |
525 | { |
526 | return le32_to_cpu(entry->hash); | |
527 | } | |
528 | ||
af5bc92d | 529 | static inline void dx_set_hash(struct dx_entry *entry, unsigned value) |
ac27a0ec DK |
530 | { |
531 | entry->hash = cpu_to_le32(value); | |
532 | } | |
533 | ||
af5bc92d | 534 | static inline unsigned dx_get_count(struct dx_entry *entries) |
ac27a0ec DK |
535 | { |
536 | return le16_to_cpu(((struct dx_countlimit *) entries)->count); | |
537 | } | |
538 | ||
af5bc92d | 539 | static inline unsigned dx_get_limit(struct dx_entry *entries) |
ac27a0ec DK |
540 | { |
541 | return le16_to_cpu(((struct dx_countlimit *) entries)->limit); | |
542 | } | |
543 | ||
af5bc92d | 544 | static inline void dx_set_count(struct dx_entry *entries, unsigned value) |
ac27a0ec DK |
545 | { |
546 | ((struct dx_countlimit *) entries)->count = cpu_to_le16(value); | |
547 | } | |
548 | ||
af5bc92d | 549 | static inline void dx_set_limit(struct dx_entry *entries, unsigned value) |
ac27a0ec DK |
550 | { |
551 | ((struct dx_countlimit *) entries)->limit = cpu_to_le16(value); | |
552 | } | |
553 | ||
af5bc92d | 554 | static inline unsigned dx_root_limit(struct inode *dir, unsigned infosize) |
ac27a0ec | 555 | { |
617ba13b MC |
556 | unsigned entry_space = dir->i_sb->s_blocksize - EXT4_DIR_REC_LEN(1) - |
557 | EXT4_DIR_REC_LEN(2) - infosize; | |
dbe89444 | 558 | |
9aa5d32b | 559 | if (ext4_has_metadata_csum(dir->i_sb)) |
dbe89444 | 560 | entry_space -= sizeof(struct dx_tail); |
d9c769b7 | 561 | return entry_space / sizeof(struct dx_entry); |
ac27a0ec DK |
562 | } |
563 | ||
af5bc92d | 564 | static inline unsigned dx_node_limit(struct inode *dir) |
ac27a0ec | 565 | { |
617ba13b | 566 | unsigned entry_space = dir->i_sb->s_blocksize - EXT4_DIR_REC_LEN(0); |
dbe89444 | 567 | |
9aa5d32b | 568 | if (ext4_has_metadata_csum(dir->i_sb)) |
dbe89444 | 569 | entry_space -= sizeof(struct dx_tail); |
d9c769b7 | 570 | return entry_space / sizeof(struct dx_entry); |
ac27a0ec DK |
571 | } |
572 | ||
573 | /* | |
574 | * Debug | |
575 | */ | |
576 | #ifdef DX_DEBUG | |
4776004f | 577 | static void dx_show_index(char * label, struct dx_entry *entries) |
ac27a0ec | 578 | { |
63f57933 | 579 | int i, n = dx_get_count (entries); |
d74f3d25 | 580 | printk(KERN_DEBUG "%s index", label); |
63f57933 | 581 | for (i = 0; i < n; i++) { |
d74f3d25 JP |
582 | printk(KERN_CONT " %x->%lu", |
583 | i ? dx_get_hash(entries + i) : 0, | |
584 | (unsigned long)dx_get_block(entries + i)); | |
63f57933 | 585 | } |
d74f3d25 | 586 | printk(KERN_CONT "\n"); |
ac27a0ec DK |
587 | } |
588 | ||
589 | struct stats | |
590 | { | |
591 | unsigned names; | |
592 | unsigned space; | |
593 | unsigned bcount; | |
594 | }; | |
595 | ||
b3098486 MH |
596 | static struct stats dx_show_leaf(struct inode *dir, |
597 | struct dx_hash_info *hinfo, | |
598 | struct ext4_dir_entry_2 *de, | |
599 | int size, int show_names) | |
ac27a0ec DK |
600 | { |
601 | unsigned names = 0, space = 0; | |
602 | char *base = (char *) de; | |
603 | struct dx_hash_info h = *hinfo; | |
604 | ||
605 | printk("names: "); | |
606 | while ((char *) de < base + size) | |
607 | { | |
608 | if (de->inode) | |
609 | { | |
610 | if (show_names) | |
611 | { | |
b3098486 MH |
612 | #ifdef CONFIG_EXT4_FS_ENCRYPTION |
613 | int len; | |
614 | char *name; | |
a7550b30 JK |
615 | struct fscrypt_str fname_crypto_str = |
616 | FSTR_INIT(NULL, 0); | |
c936e1ec | 617 | int res = 0; |
b3098486 MH |
618 | |
619 | name = de->name; | |
620 | len = de->name_len; | |
a7550b30 JK |
621 | if (ext4_encrypted_inode(dir)) |
622 | res = fscrypt_get_encryption_info(dir); | |
b7236e21 TT |
623 | if (res) { |
624 | printk(KERN_WARNING "Error setting up" | |
625 | " fname crypto: %d\n", res); | |
b3098486 | 626 | } |
a7550b30 | 627 | if (!fscrypt_has_encryption_key(dir)) { |
b3098486 MH |
628 | /* Directory is not encrypted */ |
629 | ext4fs_dirhash(de->name, | |
630 | de->name_len, &h); | |
631 | printk("%*.s:(U)%x.%u ", len, | |
632 | name, h.hash, | |
633 | (unsigned) ((char *) de | |
634 | - base)); | |
635 | } else { | |
a7550b30 JK |
636 | struct fscrypt_str de_name = |
637 | FSTR_INIT(name, len); | |
638 | ||
b3098486 | 639 | /* Directory is encrypted */ |
a7550b30 JK |
640 | res = fscrypt_fname_alloc_buffer( |
641 | dir, len, | |
b3098486 | 642 | &fname_crypto_str); |
ef1eb3aa | 643 | if (res) |
b3098486 MH |
644 | printk(KERN_WARNING "Error " |
645 | "allocating crypto " | |
646 | "buffer--skipping " | |
647 | "crypto\n"); | |
a7550b30 JK |
648 | res = fscrypt_fname_disk_to_usr(dir, |
649 | 0, 0, &de_name, | |
650 | &fname_crypto_str); | |
ef1eb3aa | 651 | if (res) { |
b3098486 MH |
652 | printk(KERN_WARNING "Error " |
653 | "converting filename " | |
654 | "from disk to usr" | |
655 | "\n"); | |
656 | name = "??"; | |
657 | len = 2; | |
658 | } else { | |
659 | name = fname_crypto_str.name; | |
660 | len = fname_crypto_str.len; | |
661 | } | |
5de0b4d0 TT |
662 | ext4fs_dirhash(de->name, de->name_len, |
663 | &h); | |
b3098486 MH |
664 | printk("%*.s:(E)%x.%u ", len, name, |
665 | h.hash, (unsigned) ((char *) de | |
666 | - base)); | |
a7550b30 JK |
667 | fscrypt_fname_free_buffer( |
668 | &fname_crypto_str); | |
b3098486 MH |
669 | } |
670 | #else | |
ac27a0ec DK |
671 | int len = de->name_len; |
672 | char *name = de->name; | |
617ba13b | 673 | ext4fs_dirhash(de->name, de->name_len, &h); |
b3098486 | 674 | printk("%*.s:%x.%u ", len, name, h.hash, |
265c6a0f | 675 | (unsigned) ((char *) de - base)); |
b3098486 | 676 | #endif |
ac27a0ec | 677 | } |
617ba13b | 678 | space += EXT4_DIR_REC_LEN(de->name_len); |
ac27a0ec DK |
679 | names++; |
680 | } | |
3d0518f4 | 681 | de = ext4_next_entry(de, size); |
ac27a0ec | 682 | } |
d74f3d25 | 683 | printk(KERN_CONT "(%i)\n", names); |
ac27a0ec DK |
684 | return (struct stats) { names, space, 1 }; |
685 | } | |
686 | ||
687 | struct stats dx_show_entries(struct dx_hash_info *hinfo, struct inode *dir, | |
688 | struct dx_entry *entries, int levels) | |
689 | { | |
690 | unsigned blocksize = dir->i_sb->s_blocksize; | |
af5bc92d | 691 | unsigned count = dx_get_count(entries), names = 0, space = 0, i; |
ac27a0ec DK |
692 | unsigned bcount = 0; |
693 | struct buffer_head *bh; | |
ac27a0ec DK |
694 | printk("%i indexed blocks...\n", count); |
695 | for (i = 0; i < count; i++, entries++) | |
696 | { | |
725d26d3 AK |
697 | ext4_lblk_t block = dx_get_block(entries); |
698 | ext4_lblk_t hash = i ? dx_get_hash(entries): 0; | |
ac27a0ec DK |
699 | u32 range = i < count - 1? (dx_get_hash(entries + 1) - hash): ~hash; |
700 | struct stats stats; | |
701 | printk("%s%3u:%03u hash %8x/%8x ",levels?"":" ", i, block, hash, range); | |
1c215028 TT |
702 | bh = ext4_bread(NULL,dir, block, 0); |
703 | if (!bh || IS_ERR(bh)) | |
704 | continue; | |
ac27a0ec DK |
705 | stats = levels? |
706 | dx_show_entries(hinfo, dir, ((struct dx_node *) bh->b_data)->entries, levels - 1): | |
b3098486 MH |
707 | dx_show_leaf(dir, hinfo, (struct ext4_dir_entry_2 *) |
708 | bh->b_data, blocksize, 0); | |
ac27a0ec DK |
709 | names += stats.names; |
710 | space += stats.space; | |
711 | bcount += stats.bcount; | |
af5bc92d | 712 | brelse(bh); |
ac27a0ec DK |
713 | } |
714 | if (bcount) | |
60e6679e | 715 | printk(KERN_DEBUG "%snames %u, fullness %u (%u%%)\n", |
4776004f TT |
716 | levels ? "" : " ", names, space/bcount, |
717 | (space/bcount)*100/blocksize); | |
ac27a0ec DK |
718 | return (struct stats) { names, space, bcount}; |
719 | } | |
720 | #endif /* DX_DEBUG */ | |
721 | ||
722 | /* | |
723 | * Probe for a directory leaf block to search. | |
724 | * | |
725 | * dx_probe can return ERR_BAD_DX_DIR, which means there was a format | |
726 | * error in the directory index, and the caller should fall back to | |
727 | * searching the directory normally. The callers of dx_probe **MUST** | |
728 | * check for this error code, and make sure it never gets reflected | |
729 | * back to userspace. | |
730 | */ | |
731 | static struct dx_frame * | |
5b643f9c | 732 | dx_probe(struct ext4_filename *fname, struct inode *dir, |
dd73b5d5 | 733 | struct dx_hash_info *hinfo, struct dx_frame *frame_in) |
ac27a0ec DK |
734 | { |
735 | unsigned count, indirect; | |
736 | struct dx_entry *at, *entries, *p, *q, *m; | |
737 | struct dx_root *root; | |
ac27a0ec | 738 | struct dx_frame *frame = frame_in; |
dd73b5d5 | 739 | struct dx_frame *ret_err = ERR_PTR(ERR_BAD_DX_DIR); |
ac27a0ec DK |
740 | u32 hash; |
741 | ||
dd73b5d5 TT |
742 | frame->bh = ext4_read_dirblock(dir, 0, INDEX); |
743 | if (IS_ERR(frame->bh)) | |
744 | return (struct dx_frame *) frame->bh; | |
745 | ||
746 | root = (struct dx_root *) frame->bh->b_data; | |
ac27a0ec DK |
747 | if (root->info.hash_version != DX_HASH_TEA && |
748 | root->info.hash_version != DX_HASH_HALF_MD4 && | |
749 | root->info.hash_version != DX_HASH_LEGACY) { | |
b03a2f7e AD |
750 | ext4_warning_inode(dir, "Unrecognised inode hash code %u", |
751 | root->info.hash_version); | |
ac27a0ec DK |
752 | goto fail; |
753 | } | |
5b643f9c TT |
754 | if (fname) |
755 | hinfo = &fname->hinfo; | |
ac27a0ec | 756 | hinfo->hash_version = root->info.hash_version; |
f99b2589 TT |
757 | if (hinfo->hash_version <= DX_HASH_TEA) |
758 | hinfo->hash_version += EXT4_SB(dir->i_sb)->s_hash_unsigned; | |
617ba13b | 759 | hinfo->seed = EXT4_SB(dir->i_sb)->s_hash_seed; |
5b643f9c TT |
760 | if (fname && fname_name(fname)) |
761 | ext4fs_dirhash(fname_name(fname), fname_len(fname), hinfo); | |
ac27a0ec DK |
762 | hash = hinfo->hash; |
763 | ||
764 | if (root->info.unused_flags & 1) { | |
b03a2f7e AD |
765 | ext4_warning_inode(dir, "Unimplemented hash flags: %#06x", |
766 | root->info.unused_flags); | |
ac27a0ec DK |
767 | goto fail; |
768 | } | |
769 | ||
b03a2f7e AD |
770 | indirect = root->info.indirect_levels; |
771 | if (indirect > 1) { | |
772 | ext4_warning_inode(dir, "Unimplemented hash depth: %#06x", | |
773 | root->info.indirect_levels); | |
ac27a0ec DK |
774 | goto fail; |
775 | } | |
776 | ||
b03a2f7e AD |
777 | entries = (struct dx_entry *)(((char *)&root->info) + |
778 | root->info.info_length); | |
3d82abae ES |
779 | |
780 | if (dx_get_limit(entries) != dx_root_limit(dir, | |
781 | root->info.info_length)) { | |
b03a2f7e AD |
782 | ext4_warning_inode(dir, "dx entry: limit %u != root limit %u", |
783 | dx_get_limit(entries), | |
784 | dx_root_limit(dir, root->info.info_length)); | |
3d82abae ES |
785 | goto fail; |
786 | } | |
787 | ||
af5bc92d | 788 | dxtrace(printk("Look up %x", hash)); |
dd73b5d5 | 789 | while (1) { |
ac27a0ec | 790 | count = dx_get_count(entries); |
3d82abae | 791 | if (!count || count > dx_get_limit(entries)) { |
b03a2f7e AD |
792 | ext4_warning_inode(dir, |
793 | "dx entry: count %u beyond limit %u", | |
794 | count, dx_get_limit(entries)); | |
dd73b5d5 | 795 | goto fail; |
3d82abae ES |
796 | } |
797 | ||
ac27a0ec DK |
798 | p = entries + 1; |
799 | q = entries + count - 1; | |
dd73b5d5 | 800 | while (p <= q) { |
b03a2f7e | 801 | m = p + (q - p) / 2; |
d74f3d25 | 802 | dxtrace(printk(KERN_CONT ".")); |
ac27a0ec DK |
803 | if (dx_get_hash(m) > hash) |
804 | q = m - 1; | |
805 | else | |
806 | p = m + 1; | |
807 | } | |
808 | ||
dd73b5d5 | 809 | if (0) { // linear search cross check |
ac27a0ec DK |
810 | unsigned n = count - 1; |
811 | at = entries; | |
812 | while (n--) | |
813 | { | |
d74f3d25 | 814 | dxtrace(printk(KERN_CONT ",")); |
ac27a0ec DK |
815 | if (dx_get_hash(++at) > hash) |
816 | { | |
817 | at--; | |
818 | break; | |
819 | } | |
820 | } | |
821 | assert (at == p - 1); | |
822 | } | |
823 | ||
824 | at = p - 1; | |
d74f3d25 JP |
825 | dxtrace(printk(KERN_CONT " %x->%u\n", |
826 | at == entries ? 0 : dx_get_hash(at), | |
b03a2f7e | 827 | dx_get_block(at))); |
ac27a0ec DK |
828 | frame->entries = entries; |
829 | frame->at = at; | |
dd73b5d5 TT |
830 | if (!indirect--) |
831 | return frame; | |
832 | frame++; | |
833 | frame->bh = ext4_read_dirblock(dir, dx_get_block(at), INDEX); | |
834 | if (IS_ERR(frame->bh)) { | |
835 | ret_err = (struct dx_frame *) frame->bh; | |
836 | frame->bh = NULL; | |
837 | goto fail; | |
dbe89444 | 838 | } |
dd73b5d5 | 839 | entries = ((struct dx_node *) frame->bh->b_data)->entries; |
dbe89444 | 840 | |
b03a2f7e AD |
841 | if (dx_get_limit(entries) != dx_node_limit(dir)) { |
842 | ext4_warning_inode(dir, | |
843 | "dx entry: limit %u != node limit %u", | |
844 | dx_get_limit(entries), dx_node_limit(dir)); | |
dd73b5d5 | 845 | goto fail; |
3d82abae | 846 | } |
ac27a0ec | 847 | } |
dd73b5d5 | 848 | fail: |
ac27a0ec DK |
849 | while (frame >= frame_in) { |
850 | brelse(frame->bh); | |
851 | frame--; | |
852 | } | |
b3098486 | 853 | |
dd73b5d5 | 854 | if (ret_err == ERR_PTR(ERR_BAD_DX_DIR)) |
b03a2f7e AD |
855 | ext4_warning_inode(dir, |
856 | "Corrupt directory, running e2fsck is recommended"); | |
dd73b5d5 | 857 | return ret_err; |
ac27a0ec DK |
858 | } |
859 | ||
b03a2f7e | 860 | static void dx_release(struct dx_frame *frames) |
ac27a0ec DK |
861 | { |
862 | if (frames[0].bh == NULL) | |
863 | return; | |
864 | ||
b03a2f7e | 865 | if (((struct dx_root *)frames[0].bh->b_data)->info.indirect_levels) |
ac27a0ec DK |
866 | brelse(frames[1].bh); |
867 | brelse(frames[0].bh); | |
868 | } | |
869 | ||
870 | /* | |
871 | * This function increments the frame pointer to search the next leaf | |
872 | * block, and reads in the necessary intervening nodes if the search | |
873 | * should be necessary. Whether or not the search is necessary is | |
874 | * controlled by the hash parameter. If the hash value is even, then | |
875 | * the search is only continued if the next block starts with that | |
876 | * hash value. This is used if we are searching for a specific file. | |
877 | * | |
878 | * If the hash value is HASH_NB_ALWAYS, then always go to the next block. | |
879 | * | |
880 | * This function returns 1 if the caller should continue to search, | |
881 | * or 0 if it should not. If there is an error reading one of the | |
882 | * index blocks, it will a negative error code. | |
883 | * | |
884 | * If start_hash is non-null, it will be filled in with the starting | |
885 | * hash of the next page. | |
886 | */ | |
617ba13b | 887 | static int ext4_htree_next_block(struct inode *dir, __u32 hash, |
ac27a0ec DK |
888 | struct dx_frame *frame, |
889 | struct dx_frame *frames, | |
890 | __u32 *start_hash) | |
891 | { | |
892 | struct dx_frame *p; | |
893 | struct buffer_head *bh; | |
dc6982ff | 894 | int num_frames = 0; |
ac27a0ec DK |
895 | __u32 bhash; |
896 | ||
897 | p = frame; | |
898 | /* | |
899 | * Find the next leaf page by incrementing the frame pointer. | |
900 | * If we run out of entries in the interior node, loop around and | |
901 | * increment pointer in the parent node. When we break out of | |
902 | * this loop, num_frames indicates the number of interior | |
903 | * nodes need to be read. | |
904 | */ | |
905 | while (1) { | |
906 | if (++(p->at) < p->entries + dx_get_count(p->entries)) | |
907 | break; | |
908 | if (p == frames) | |
909 | return 0; | |
910 | num_frames++; | |
911 | p--; | |
912 | } | |
913 | ||
914 | /* | |
915 | * If the hash is 1, then continue only if the next page has a | |
916 | * continuation hash of any value. This is used for readdir | |
917 | * handling. Otherwise, check to see if the hash matches the | |
918 | * desired contiuation hash. If it doesn't, return since | |
919 | * there's no point to read in the successive index pages. | |
920 | */ | |
921 | bhash = dx_get_hash(p->at); | |
922 | if (start_hash) | |
923 | *start_hash = bhash; | |
924 | if ((hash & 1) == 0) { | |
925 | if ((bhash & ~1) != hash) | |
926 | return 0; | |
927 | } | |
928 | /* | |
929 | * If the hash is HASH_NB_ALWAYS, we always go to the next | |
930 | * block so no check is necessary | |
931 | */ | |
932 | while (num_frames--) { | |
dc6982ff TT |
933 | bh = ext4_read_dirblock(dir, dx_get_block(p->at), INDEX); |
934 | if (IS_ERR(bh)) | |
935 | return PTR_ERR(bh); | |
ac27a0ec | 936 | p++; |
af5bc92d | 937 | brelse(p->bh); |
ac27a0ec DK |
938 | p->bh = bh; |
939 | p->at = p->entries = ((struct dx_node *) bh->b_data)->entries; | |
940 | } | |
941 | return 1; | |
942 | } | |
943 | ||
944 | ||
ac27a0ec DK |
945 | /* |
946 | * This function fills a red-black tree with information from a | |
947 | * directory block. It returns the number directory entries loaded | |
948 | * into the tree. If there is an error it is returned in err. | |
949 | */ | |
950 | static int htree_dirblock_to_tree(struct file *dir_file, | |
725d26d3 | 951 | struct inode *dir, ext4_lblk_t block, |
ac27a0ec DK |
952 | struct dx_hash_info *hinfo, |
953 | __u32 start_hash, __u32 start_minor_hash) | |
954 | { | |
955 | struct buffer_head *bh; | |
617ba13b | 956 | struct ext4_dir_entry_2 *de, *top; |
90b0a973 | 957 | int err = 0, count = 0; |
a7550b30 | 958 | struct fscrypt_str fname_crypto_str = FSTR_INIT(NULL, 0), tmp_str; |
ac27a0ec | 959 | |
725d26d3 AK |
960 | dxtrace(printk(KERN_INFO "In htree dirblock_to_tree: block %lu\n", |
961 | (unsigned long)block)); | |
dc6982ff TT |
962 | bh = ext4_read_dirblock(dir, block, DIRENT); |
963 | if (IS_ERR(bh)) | |
964 | return PTR_ERR(bh); | |
b0336e8d | 965 | |
617ba13b MC |
966 | de = (struct ext4_dir_entry_2 *) bh->b_data; |
967 | top = (struct ext4_dir_entry_2 *) ((char *) de + | |
ac27a0ec | 968 | dir->i_sb->s_blocksize - |
617ba13b | 969 | EXT4_DIR_REC_LEN(0)); |
1f3862b5 MH |
970 | #ifdef CONFIG_EXT4_FS_ENCRYPTION |
971 | /* Check if the directory is encrypted */ | |
b7236e21 | 972 | if (ext4_encrypted_inode(dir)) { |
a7550b30 | 973 | err = fscrypt_get_encryption_info(dir); |
c936e1ec TT |
974 | if (err < 0) { |
975 | brelse(bh); | |
976 | return err; | |
977 | } | |
a7550b30 | 978 | err = fscrypt_fname_alloc_buffer(dir, EXT4_NAME_LEN, |
1f3862b5 MH |
979 | &fname_crypto_str); |
980 | if (err < 0) { | |
1f3862b5 MH |
981 | brelse(bh); |
982 | return err; | |
983 | } | |
984 | } | |
985 | #endif | |
3d0518f4 | 986 | for (; de < top; de = ext4_next_entry(de, dir->i_sb->s_blocksize)) { |
f7c21177 | 987 | if (ext4_check_dir_entry(dir, NULL, de, bh, |
226ba972 | 988 | bh->b_data, bh->b_size, |
cad3f007 TT |
989 | (block<<EXT4_BLOCK_SIZE_BITS(dir->i_sb)) |
990 | + ((char *)de - bh->b_data))) { | |
64cb9273 AV |
991 | /* silently ignore the rest of the block */ |
992 | break; | |
e6c40211 | 993 | } |
617ba13b | 994 | ext4fs_dirhash(de->name, de->name_len, hinfo); |
ac27a0ec DK |
995 | if ((hinfo->hash < start_hash) || |
996 | ((hinfo->hash == start_hash) && | |
997 | (hinfo->minor_hash < start_minor_hash))) | |
998 | continue; | |
999 | if (de->inode == 0) | |
1000 | continue; | |
b7236e21 | 1001 | if (!ext4_encrypted_inode(dir)) { |
1f3862b5 MH |
1002 | tmp_str.name = de->name; |
1003 | tmp_str.len = de->name_len; | |
1004 | err = ext4_htree_store_dirent(dir_file, | |
1005 | hinfo->hash, hinfo->minor_hash, de, | |
1006 | &tmp_str); | |
1007 | } else { | |
d2299590 | 1008 | int save_len = fname_crypto_str.len; |
a7550b30 JK |
1009 | struct fscrypt_str de_name = FSTR_INIT(de->name, |
1010 | de->name_len); | |
d2299590 | 1011 | |
1f3862b5 | 1012 | /* Directory is encrypted */ |
a7550b30 JK |
1013 | err = fscrypt_fname_disk_to_usr(dir, hinfo->hash, |
1014 | hinfo->minor_hash, &de_name, | |
1015 | &fname_crypto_str); | |
ef1eb3aa | 1016 | if (err) { |
1f3862b5 MH |
1017 | count = err; |
1018 | goto errout; | |
1019 | } | |
1020 | err = ext4_htree_store_dirent(dir_file, | |
1021 | hinfo->hash, hinfo->minor_hash, de, | |
1022 | &fname_crypto_str); | |
d2299590 | 1023 | fname_crypto_str.len = save_len; |
1f3862b5 | 1024 | } |
2f61830a | 1025 | if (err != 0) { |
1f3862b5 MH |
1026 | count = err; |
1027 | goto errout; | |
ac27a0ec DK |
1028 | } |
1029 | count++; | |
1030 | } | |
1f3862b5 | 1031 | errout: |
ac27a0ec | 1032 | brelse(bh); |
1f3862b5 | 1033 | #ifdef CONFIG_EXT4_FS_ENCRYPTION |
a7550b30 | 1034 | fscrypt_fname_free_buffer(&fname_crypto_str); |
1f3862b5 | 1035 | #endif |
ac27a0ec DK |
1036 | return count; |
1037 | } | |
1038 | ||
1039 | ||
1040 | /* | |
1041 | * This function fills a red-black tree with information from a | |
1042 | * directory. We start scanning the directory in hash order, starting | |
1043 | * at start_hash and start_minor_hash. | |
1044 | * | |
1045 | * This function returns the number of entries inserted into the tree, | |
1046 | * or a negative error code. | |
1047 | */ | |
617ba13b | 1048 | int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, |
ac27a0ec DK |
1049 | __u32 start_minor_hash, __u32 *next_hash) |
1050 | { | |
1051 | struct dx_hash_info hinfo; | |
617ba13b | 1052 | struct ext4_dir_entry_2 *de; |
ac27a0ec DK |
1053 | struct dx_frame frames[2], *frame; |
1054 | struct inode *dir; | |
725d26d3 | 1055 | ext4_lblk_t block; |
ac27a0ec | 1056 | int count = 0; |
725d26d3 | 1057 | int ret, err; |
ac27a0ec | 1058 | __u32 hashval; |
a7550b30 | 1059 | struct fscrypt_str tmp_str; |
ac27a0ec | 1060 | |
60e6679e | 1061 | dxtrace(printk(KERN_DEBUG "In htree_fill_tree, start hash: %x:%x\n", |
4776004f | 1062 | start_hash, start_minor_hash)); |
496ad9aa | 1063 | dir = file_inode(dir_file); |
12e9b892 | 1064 | if (!(ext4_test_inode_flag(dir, EXT4_INODE_INDEX))) { |
617ba13b | 1065 | hinfo.hash_version = EXT4_SB(dir->i_sb)->s_def_hash_version; |
f99b2589 TT |
1066 | if (hinfo.hash_version <= DX_HASH_TEA) |
1067 | hinfo.hash_version += | |
1068 | EXT4_SB(dir->i_sb)->s_hash_unsigned; | |
617ba13b | 1069 | hinfo.seed = EXT4_SB(dir->i_sb)->s_hash_seed; |
8af0f082 TM |
1070 | if (ext4_has_inline_data(dir)) { |
1071 | int has_inline_data = 1; | |
1072 | count = htree_inlinedir_to_tree(dir_file, dir, 0, | |
1073 | &hinfo, start_hash, | |
1074 | start_minor_hash, | |
1075 | &has_inline_data); | |
1076 | if (has_inline_data) { | |
1077 | *next_hash = ~0; | |
1078 | return count; | |
1079 | } | |
1080 | } | |
ac27a0ec DK |
1081 | count = htree_dirblock_to_tree(dir_file, dir, 0, &hinfo, |
1082 | start_hash, start_minor_hash); | |
1083 | *next_hash = ~0; | |
1084 | return count; | |
1085 | } | |
1086 | hinfo.hash = start_hash; | |
1087 | hinfo.minor_hash = 0; | |
dd73b5d5 TT |
1088 | frame = dx_probe(NULL, dir, &hinfo, frames); |
1089 | if (IS_ERR(frame)) | |
1090 | return PTR_ERR(frame); | |
ac27a0ec DK |
1091 | |
1092 | /* Add '.' and '..' from the htree header */ | |
1093 | if (!start_hash && !start_minor_hash) { | |
617ba13b | 1094 | de = (struct ext4_dir_entry_2 *) frames[0].bh->b_data; |
2f61830a TT |
1095 | tmp_str.name = de->name; |
1096 | tmp_str.len = de->name_len; | |
1097 | err = ext4_htree_store_dirent(dir_file, 0, 0, | |
1098 | de, &tmp_str); | |
1099 | if (err != 0) | |
ac27a0ec DK |
1100 | goto errout; |
1101 | count++; | |
1102 | } | |
1103 | if (start_hash < 2 || (start_hash ==2 && start_minor_hash==0)) { | |
617ba13b | 1104 | de = (struct ext4_dir_entry_2 *) frames[0].bh->b_data; |
3d0518f4 | 1105 | de = ext4_next_entry(de, dir->i_sb->s_blocksize); |
2f61830a TT |
1106 | tmp_str.name = de->name; |
1107 | tmp_str.len = de->name_len; | |
1108 | err = ext4_htree_store_dirent(dir_file, 2, 0, | |
1109 | de, &tmp_str); | |
1110 | if (err != 0) | |
ac27a0ec DK |
1111 | goto errout; |
1112 | count++; | |
1113 | } | |
1114 | ||
1115 | while (1) { | |
1f60fbe7 TT |
1116 | if (fatal_signal_pending(current)) { |
1117 | err = -ERESTARTSYS; | |
1118 | goto errout; | |
1119 | } | |
1120 | cond_resched(); | |
ac27a0ec DK |
1121 | block = dx_get_block(frame->at); |
1122 | ret = htree_dirblock_to_tree(dir_file, dir, block, &hinfo, | |
1123 | start_hash, start_minor_hash); | |
1124 | if (ret < 0) { | |
1125 | err = ret; | |
1126 | goto errout; | |
1127 | } | |
1128 | count += ret; | |
1129 | hashval = ~0; | |
617ba13b | 1130 | ret = ext4_htree_next_block(dir, HASH_NB_ALWAYS, |
ac27a0ec DK |
1131 | frame, frames, &hashval); |
1132 | *next_hash = hashval; | |
1133 | if (ret < 0) { | |
1134 | err = ret; | |
1135 | goto errout; | |
1136 | } | |
1137 | /* | |
1138 | * Stop if: (a) there are no more entries, or | |
1139 | * (b) we have inserted at least one entry and the | |
1140 | * next hash value is not a continuation | |
1141 | */ | |
1142 | if ((ret == 0) || | |
1143 | (count && ((hashval & 1) == 0))) | |
1144 | break; | |
1145 | } | |
1146 | dx_release(frames); | |
4776004f TT |
1147 | dxtrace(printk(KERN_DEBUG "Fill tree: returned %d entries, " |
1148 | "next hash: %x\n", count, *next_hash)); | |
ac27a0ec DK |
1149 | return count; |
1150 | errout: | |
1151 | dx_release(frames); | |
1152 | return (err); | |
1153 | } | |
1154 | ||
7335cd3b TM |
1155 | static inline int search_dirblock(struct buffer_head *bh, |
1156 | struct inode *dir, | |
5b643f9c | 1157 | struct ext4_filename *fname, |
7335cd3b TM |
1158 | const struct qstr *d_name, |
1159 | unsigned int offset, | |
1160 | struct ext4_dir_entry_2 **res_dir) | |
1161 | { | |
5b643f9c TT |
1162 | return ext4_search_dir(bh, bh->b_data, dir->i_sb->s_blocksize, dir, |
1163 | fname, d_name, offset, res_dir); | |
7335cd3b TM |
1164 | } |
1165 | ||
ac27a0ec DK |
1166 | /* |
1167 | * Directory block splitting, compacting | |
1168 | */ | |
1169 | ||
ef2b02d3 ES |
1170 | /* |
1171 | * Create map of hash values, offsets, and sizes, stored at end of block. | |
1172 | * Returns number of entries mapped. | |
1173 | */ | |
1f3862b5 MH |
1174 | static int dx_make_map(struct inode *dir, struct ext4_dir_entry_2 *de, |
1175 | unsigned blocksize, struct dx_hash_info *hinfo, | |
8bad4597 | 1176 | struct dx_map_entry *map_tail) |
ac27a0ec DK |
1177 | { |
1178 | int count = 0; | |
1179 | char *base = (char *) de; | |
1180 | struct dx_hash_info h = *hinfo; | |
1181 | ||
8bad4597 | 1182 | while ((char *) de < base + blocksize) { |
ac27a0ec | 1183 | if (de->name_len && de->inode) { |
617ba13b | 1184 | ext4fs_dirhash(de->name, de->name_len, &h); |
ac27a0ec DK |
1185 | map_tail--; |
1186 | map_tail->hash = h.hash; | |
9aee2286 | 1187 | map_tail->offs = ((char *) de - base)>>2; |
ef2b02d3 | 1188 | map_tail->size = le16_to_cpu(de->rec_len); |
ac27a0ec DK |
1189 | count++; |
1190 | cond_resched(); | |
1191 | } | |
1192 | /* XXX: do we need to check rec_len == 0 case? -Chris */ | |
3d0518f4 | 1193 | de = ext4_next_entry(de, blocksize); |
ac27a0ec DK |
1194 | } |
1195 | return count; | |
1196 | } | |
1197 | ||
ef2b02d3 | 1198 | /* Sort map by hash value */ |
ac27a0ec DK |
1199 | static void dx_sort_map (struct dx_map_entry *map, unsigned count) |
1200 | { | |
63f57933 AM |
1201 | struct dx_map_entry *p, *q, *top = map + count - 1; |
1202 | int more; | |
1203 | /* Combsort until bubble sort doesn't suck */ | |
1204 | while (count > 2) { | |
1205 | count = count*10/13; | |
1206 | if (count - 9 < 2) /* 9, 10 -> 11 */ | |
1207 | count = 11; | |
1208 | for (p = top, q = p - count; q >= map; p--, q--) | |
1209 | if (p->hash < q->hash) | |
1210 | swap(*p, *q); | |
1211 | } | |
1212 | /* Garden variety bubble sort */ | |
1213 | do { | |
1214 | more = 0; | |
1215 | q = top; | |
1216 | while (q-- > map) { | |
1217 | if (q[1].hash >= q[0].hash) | |
ac27a0ec | 1218 | continue; |
63f57933 AM |
1219 | swap(*(q+1), *q); |
1220 | more = 1; | |
ac27a0ec DK |
1221 | } |
1222 | } while(more); | |
1223 | } | |
1224 | ||
725d26d3 | 1225 | static void dx_insert_block(struct dx_frame *frame, u32 hash, ext4_lblk_t block) |
ac27a0ec DK |
1226 | { |
1227 | struct dx_entry *entries = frame->entries; | |
1228 | struct dx_entry *old = frame->at, *new = old + 1; | |
1229 | int count = dx_get_count(entries); | |
1230 | ||
1231 | assert(count < dx_get_limit(entries)); | |
1232 | assert(old < entries + count); | |
1233 | memmove(new + 1, new, (char *)(entries + count) - (char *)(new)); | |
1234 | dx_set_hash(new, hash); | |
1235 | dx_set_block(new, block); | |
1236 | dx_set_count(entries, count + 1); | |
1237 | } | |
ac27a0ec | 1238 | |
ac27a0ec | 1239 | /* |
617ba13b | 1240 | * NOTE! unlike strncmp, ext4_match returns 1 for success, 0 for failure. |
ac27a0ec | 1241 | * |
617ba13b | 1242 | * `len <= EXT4_NAME_LEN' is guaranteed by caller. |
ac27a0ec DK |
1243 | * `de != NULL' is guaranteed by caller. |
1244 | */ | |
5b643f9c | 1245 | static inline int ext4_match(struct ext4_filename *fname, |
1f3862b5 | 1246 | struct ext4_dir_entry_2 *de) |
ac27a0ec | 1247 | { |
5b643f9c TT |
1248 | const void *name = fname_name(fname); |
1249 | u32 len = fname_len(fname); | |
1f3862b5 | 1250 | |
ac27a0ec DK |
1251 | if (!de->inode) |
1252 | return 0; | |
1f3862b5 MH |
1253 | |
1254 | #ifdef CONFIG_EXT4_FS_ENCRYPTION | |
5b643f9c TT |
1255 | if (unlikely(!name)) { |
1256 | if (fname->usr_fname->name[0] == '_') { | |
1257 | int ret; | |
1258 | if (de->name_len < 16) | |
1259 | return 0; | |
1260 | ret = memcmp(de->name + de->name_len - 16, | |
1261 | fname->crypto_buf.name + 8, 16); | |
1262 | return (ret == 0) ? 1 : 0; | |
1263 | } | |
1264 | name = fname->crypto_buf.name; | |
1265 | len = fname->crypto_buf.len; | |
1266 | } | |
1f3862b5 | 1267 | #endif |
5b643f9c | 1268 | if (de->name_len != len) |
1f3862b5 | 1269 | return 0; |
5b643f9c | 1270 | return (memcmp(de->name, name, len) == 0) ? 1 : 0; |
ac27a0ec DK |
1271 | } |
1272 | ||
1273 | /* | |
1274 | * Returns 0 if not found, -1 on failure, and 1 on success | |
1275 | */ | |
5b643f9c TT |
1276 | int ext4_search_dir(struct buffer_head *bh, char *search_buf, int buf_size, |
1277 | struct inode *dir, struct ext4_filename *fname, | |
1278 | const struct qstr *d_name, | |
1279 | unsigned int offset, struct ext4_dir_entry_2 **res_dir) | |
ac27a0ec | 1280 | { |
617ba13b | 1281 | struct ext4_dir_entry_2 * de; |
ac27a0ec DK |
1282 | char * dlimit; |
1283 | int de_len; | |
1f3862b5 MH |
1284 | int res; |
1285 | ||
7335cd3b TM |
1286 | de = (struct ext4_dir_entry_2 *)search_buf; |
1287 | dlimit = search_buf + buf_size; | |
ac27a0ec DK |
1288 | while ((char *) de < dlimit) { |
1289 | /* this code is executed quadratically often */ | |
1290 | /* do minimal checking `by hand' */ | |
1f3862b5 | 1291 | if ((char *) de + de->name_len <= dlimit) { |
5b643f9c | 1292 | res = ext4_match(fname, de); |
1f3862b5 MH |
1293 | if (res < 0) { |
1294 | res = -1; | |
1295 | goto return_result; | |
1296 | } | |
1297 | if (res > 0) { | |
1298 | /* found a match - just to be sure, do | |
1299 | * a full check */ | |
1300 | if (ext4_check_dir_entry(dir, NULL, de, bh, | |
1301 | bh->b_data, | |
1302 | bh->b_size, offset)) { | |
1303 | res = -1; | |
1304 | goto return_result; | |
1305 | } | |
1306 | *res_dir = de; | |
1307 | res = 1; | |
1308 | goto return_result; | |
1309 | } | |
ac27a0ec | 1310 | |
ac27a0ec DK |
1311 | } |
1312 | /* prevent looping on a bad block */ | |
3d0518f4 WY |
1313 | de_len = ext4_rec_len_from_disk(de->rec_len, |
1314 | dir->i_sb->s_blocksize); | |
1f3862b5 MH |
1315 | if (de_len <= 0) { |
1316 | res = -1; | |
1317 | goto return_result; | |
1318 | } | |
ac27a0ec | 1319 | offset += de_len; |
617ba13b | 1320 | de = (struct ext4_dir_entry_2 *) ((char *) de + de_len); |
ac27a0ec | 1321 | } |
1f3862b5 MH |
1322 | |
1323 | res = 0; | |
1324 | return_result: | |
1f3862b5 | 1325 | return res; |
ac27a0ec DK |
1326 | } |
1327 | ||
c6af8803 DW |
1328 | static int is_dx_internal_node(struct inode *dir, ext4_lblk_t block, |
1329 | struct ext4_dir_entry *de) | |
1330 | { | |
1331 | struct super_block *sb = dir->i_sb; | |
1332 | ||
1333 | if (!is_dx(dir)) | |
1334 | return 0; | |
1335 | if (block == 0) | |
1336 | return 1; | |
1337 | if (de->inode == 0 && | |
1338 | ext4_rec_len_from_disk(de->rec_len, sb->s_blocksize) == | |
1339 | sb->s_blocksize) | |
1340 | return 1; | |
1341 | return 0; | |
1342 | } | |
ac27a0ec DK |
1343 | |
1344 | /* | |
617ba13b | 1345 | * ext4_find_entry() |
ac27a0ec DK |
1346 | * |
1347 | * finds an entry in the specified directory with the wanted name. It | |
1348 | * returns the cache buffer in which the entry was found, and the entry | |
1349 | * itself (as a parameter - res_dir). It does NOT read the inode of the | |
1350 | * entry - you'll have to do that yourself if you want to. | |
1351 | * | |
1352 | * The returned buffer_head has ->b_count elevated. The caller is expected | |
1353 | * to brelse() it when appropriate. | |
1354 | */ | |
f702ba0f TT |
1355 | static struct buffer_head * ext4_find_entry (struct inode *dir, |
1356 | const struct qstr *d_name, | |
32f7f22c TM |
1357 | struct ext4_dir_entry_2 **res_dir, |
1358 | int *inlined) | |
ac27a0ec | 1359 | { |
af5bc92d TT |
1360 | struct super_block *sb; |
1361 | struct buffer_head *bh_use[NAMEI_RA_SIZE]; | |
1362 | struct buffer_head *bh, *ret = NULL; | |
725d26d3 | 1363 | ext4_lblk_t start, block, b; |
8941ec8b | 1364 | const u8 *name = d_name->name; |
ac27a0ec DK |
1365 | int ra_max = 0; /* Number of bh's in the readahead |
1366 | buffer, bh_use[] */ | |
1367 | int ra_ptr = 0; /* Current index into readahead | |
1368 | buffer */ | |
1369 | int num = 0; | |
725d26d3 | 1370 | ext4_lblk_t nblocks; |
5b643f9c TT |
1371 | int i, namelen, retval; |
1372 | struct ext4_filename fname; | |
ac27a0ec DK |
1373 | |
1374 | *res_dir = NULL; | |
1375 | sb = dir->i_sb; | |
f702ba0f | 1376 | namelen = d_name->len; |
617ba13b | 1377 | if (namelen > EXT4_NAME_LEN) |
ac27a0ec | 1378 | return NULL; |
e8e948e7 | 1379 | |
5b643f9c | 1380 | retval = ext4_fname_setup_filename(dir, d_name, 1, &fname); |
54475f53 EB |
1381 | if (retval == -ENOENT) |
1382 | return NULL; | |
5b643f9c TT |
1383 | if (retval) |
1384 | return ERR_PTR(retval); | |
1385 | ||
e8e948e7 TM |
1386 | if (ext4_has_inline_data(dir)) { |
1387 | int has_inline_data = 1; | |
5b643f9c | 1388 | ret = ext4_find_inline_entry(dir, &fname, d_name, res_dir, |
e8e948e7 | 1389 | &has_inline_data); |
32f7f22c TM |
1390 | if (has_inline_data) { |
1391 | if (inlined) | |
1392 | *inlined = 1; | |
5b643f9c | 1393 | goto cleanup_and_exit; |
32f7f22c | 1394 | } |
e8e948e7 TM |
1395 | } |
1396 | ||
8941ec8b | 1397 | if ((namelen <= 2) && (name[0] == '.') && |
6d5c3aa8 | 1398 | (name[1] == '.' || name[1] == '\0')) { |
8941ec8b TT |
1399 | /* |
1400 | * "." or ".." will only be in the first block | |
1401 | * NFS may look up ".."; "." should be handled by the VFS | |
1402 | */ | |
1403 | block = start = 0; | |
1404 | nblocks = 1; | |
1405 | goto restart; | |
1406 | } | |
ac27a0ec | 1407 | if (is_dx(dir)) { |
5b643f9c | 1408 | ret = ext4_dx_find_entry(dir, &fname, res_dir); |
ac27a0ec DK |
1409 | /* |
1410 | * On success, or if the error was file not found, | |
1411 | * return. Otherwise, fall back to doing a search the | |
1412 | * old fashioned way. | |
1413 | */ | |
5b643f9c TT |
1414 | if (!IS_ERR(ret) || PTR_ERR(ret) != ERR_BAD_DX_DIR) |
1415 | goto cleanup_and_exit; | |
4776004f TT |
1416 | dxtrace(printk(KERN_DEBUG "ext4_find_entry: dx failed, " |
1417 | "falling back\n")); | |
ac27a0ec | 1418 | } |
617ba13b MC |
1419 | nblocks = dir->i_size >> EXT4_BLOCK_SIZE_BITS(sb); |
1420 | start = EXT4_I(dir)->i_dir_start_lookup; | |
ac27a0ec DK |
1421 | if (start >= nblocks) |
1422 | start = 0; | |
1423 | block = start; | |
1424 | restart: | |
1425 | do { | |
1426 | /* | |
1427 | * We deal with the read-ahead logic here. | |
1428 | */ | |
1429 | if (ra_ptr >= ra_max) { | |
1430 | /* Refill the readahead buffer */ | |
1431 | ra_ptr = 0; | |
1432 | b = block; | |
1433 | for (ra_max = 0; ra_max < NAMEI_RA_SIZE; ra_max++) { | |
1434 | /* | |
1435 | * Terminate if we reach the end of the | |
1436 | * directory and must wrap, or if our | |
1437 | * search has finished at this block. | |
1438 | */ | |
1439 | if (b >= nblocks || (num && block == start)) { | |
1440 | bh_use[ra_max] = NULL; | |
1441 | break; | |
1442 | } | |
1443 | num++; | |
10560082 | 1444 | bh = ext4_getblk(NULL, dir, b++, 0); |
a1c83681 | 1445 | if (IS_ERR(bh)) { |
5b643f9c TT |
1446 | if (ra_max == 0) { |
1447 | ret = bh; | |
1448 | goto cleanup_and_exit; | |
1449 | } | |
36de9286 TT |
1450 | break; |
1451 | } | |
ac27a0ec DK |
1452 | bh_use[ra_max] = bh; |
1453 | if (bh) | |
dfec8a14 MC |
1454 | ll_rw_block(REQ_OP_READ, |
1455 | REQ_META | REQ_PRIO, | |
65299a3b | 1456 | 1, &bh); |
ac27a0ec DK |
1457 | } |
1458 | } | |
1459 | if ((bh = bh_use[ra_ptr++]) == NULL) | |
1460 | goto next; | |
1461 | wait_on_buffer(bh); | |
1462 | if (!buffer_uptodate(bh)) { | |
1463 | /* read error, skip block & hope for the best */ | |
24676da4 TT |
1464 | EXT4_ERROR_INODE(dir, "reading directory lblock %lu", |
1465 | (unsigned long) block); | |
ac27a0ec DK |
1466 | brelse(bh); |
1467 | goto next; | |
1468 | } | |
b0336e8d | 1469 | if (!buffer_verified(bh) && |
c6af8803 DW |
1470 | !is_dx_internal_node(dir, block, |
1471 | (struct ext4_dir_entry *)bh->b_data) && | |
b0336e8d DW |
1472 | !ext4_dirent_csum_verify(dir, |
1473 | (struct ext4_dir_entry *)bh->b_data)) { | |
1474 | EXT4_ERROR_INODE(dir, "checksumming directory " | |
1475 | "block %lu", (unsigned long)block); | |
1476 | brelse(bh); | |
1477 | goto next; | |
1478 | } | |
1479 | set_buffer_verified(bh); | |
5b643f9c | 1480 | i = search_dirblock(bh, dir, &fname, d_name, |
617ba13b | 1481 | block << EXT4_BLOCK_SIZE_BITS(sb), res_dir); |
ac27a0ec | 1482 | if (i == 1) { |
617ba13b | 1483 | EXT4_I(dir)->i_dir_start_lookup = block; |
ac27a0ec DK |
1484 | ret = bh; |
1485 | goto cleanup_and_exit; | |
1486 | } else { | |
1487 | brelse(bh); | |
1488 | if (i < 0) | |
1489 | goto cleanup_and_exit; | |
1490 | } | |
1491 | next: | |
1492 | if (++block >= nblocks) | |
1493 | block = 0; | |
1494 | } while (block != start); | |
1495 | ||
1496 | /* | |
1497 | * If the directory has grown while we were searching, then | |
1498 | * search the last part of the directory before giving up. | |
1499 | */ | |
1500 | block = nblocks; | |
617ba13b | 1501 | nblocks = dir->i_size >> EXT4_BLOCK_SIZE_BITS(sb); |
ac27a0ec DK |
1502 | if (block < nblocks) { |
1503 | start = 0; | |
1504 | goto restart; | |
1505 | } | |
1506 | ||
1507 | cleanup_and_exit: | |
1508 | /* Clean up the read-ahead blocks */ | |
1509 | for (; ra_ptr < ra_max; ra_ptr++) | |
af5bc92d | 1510 | brelse(bh_use[ra_ptr]); |
5b643f9c | 1511 | ext4_fname_free_filename(&fname); |
ac27a0ec DK |
1512 | return ret; |
1513 | } | |
1514 | ||
5b643f9c TT |
1515 | static struct buffer_head * ext4_dx_find_entry(struct inode *dir, |
1516 | struct ext4_filename *fname, | |
1517 | struct ext4_dir_entry_2 **res_dir) | |
ac27a0ec | 1518 | { |
8941ec8b | 1519 | struct super_block * sb = dir->i_sb; |
ac27a0ec | 1520 | struct dx_frame frames[2], *frame; |
5b643f9c | 1521 | const struct qstr *d_name = fname->usr_fname; |
ac27a0ec | 1522 | struct buffer_head *bh; |
725d26d3 | 1523 | ext4_lblk_t block; |
ac27a0ec | 1524 | int retval; |
ac27a0ec | 1525 | |
1f3862b5 MH |
1526 | #ifdef CONFIG_EXT4_FS_ENCRYPTION |
1527 | *res_dir = NULL; | |
1528 | #endif | |
5b643f9c | 1529 | frame = dx_probe(fname, dir, NULL, frames); |
dd73b5d5 TT |
1530 | if (IS_ERR(frame)) |
1531 | return (struct buffer_head *) frame; | |
ac27a0ec DK |
1532 | do { |
1533 | block = dx_get_block(frame->at); | |
dc6982ff | 1534 | bh = ext4_read_dirblock(dir, block, DIRENT); |
537d8f93 | 1535 | if (IS_ERR(bh)) |
b0336e8d | 1536 | goto errout; |
537d8f93 | 1537 | |
5b643f9c | 1538 | retval = search_dirblock(bh, dir, fname, d_name, |
7845c049 TT |
1539 | block << EXT4_BLOCK_SIZE_BITS(sb), |
1540 | res_dir); | |
537d8f93 TT |
1541 | if (retval == 1) |
1542 | goto success; | |
af5bc92d | 1543 | brelse(bh); |
7845c049 | 1544 | if (retval == -1) { |
537d8f93 | 1545 | bh = ERR_PTR(ERR_BAD_DX_DIR); |
7845c049 TT |
1546 | goto errout; |
1547 | } | |
1548 | ||
ac27a0ec | 1549 | /* Check to see if we should continue to search */ |
5b643f9c | 1550 | retval = ext4_htree_next_block(dir, fname->hinfo.hash, frame, |
ac27a0ec DK |
1551 | frames, NULL); |
1552 | if (retval < 0) { | |
b03a2f7e AD |
1553 | ext4_warning_inode(dir, |
1554 | "error %d reading directory index block", | |
1555 | retval); | |
537d8f93 | 1556 | bh = ERR_PTR(retval); |
ac27a0ec DK |
1557 | goto errout; |
1558 | } | |
1559 | } while (retval == 1); | |
1560 | ||
537d8f93 | 1561 | bh = NULL; |
ac27a0ec | 1562 | errout: |
265c6a0f | 1563 | dxtrace(printk(KERN_DEBUG "%s not found\n", d_name->name)); |
537d8f93 TT |
1564 | success: |
1565 | dx_release(frames); | |
1566 | return bh; | |
ac27a0ec | 1567 | } |
ac27a0ec | 1568 | |
00cd8dd3 | 1569 | static struct dentry *ext4_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) |
ac27a0ec | 1570 | { |
af5bc92d TT |
1571 | struct inode *inode; |
1572 | struct ext4_dir_entry_2 *de; | |
1573 | struct buffer_head *bh; | |
ac27a0ec | 1574 | |
a7550b30 JK |
1575 | if (ext4_encrypted_inode(dir)) { |
1576 | int res = fscrypt_get_encryption_info(dir); | |
28b4c263 TT |
1577 | |
1578 | /* | |
a7550b30 | 1579 | * DCACHE_ENCRYPTED_WITH_KEY is set if the dentry is |
28b4c263 | 1580 | * created while the directory was encrypted and we |
a7550b30 | 1581 | * have access to the key. |
28b4c263 | 1582 | */ |
a7550b30 JK |
1583 | if (fscrypt_has_encryption_key(dir)) |
1584 | fscrypt_set_encrypted_dentry(dentry); | |
1585 | fscrypt_set_d_op(dentry); | |
1586 | if (res && res != -ENOKEY) | |
1587 | return ERR_PTR(res); | |
1588 | } | |
28b4c263 | 1589 | |
a7550b30 JK |
1590 | if (dentry->d_name.len > EXT4_NAME_LEN) |
1591 | return ERR_PTR(-ENAMETOOLONG); | |
ac27a0ec | 1592 | |
32f7f22c | 1593 | bh = ext4_find_entry(dir, &dentry->d_name, &de, NULL); |
36de9286 TT |
1594 | if (IS_ERR(bh)) |
1595 | return (struct dentry *) bh; | |
ac27a0ec DK |
1596 | inode = NULL; |
1597 | if (bh) { | |
498e5f24 | 1598 | __u32 ino = le32_to_cpu(de->inode); |
af5bc92d | 1599 | brelse(bh); |
617ba13b | 1600 | if (!ext4_valid_inum(dir->i_sb, ino)) { |
24676da4 | 1601 | EXT4_ERROR_INODE(dir, "bad inode number: %u", ino); |
6a797d27 | 1602 | return ERR_PTR(-EFSCORRUPTED); |
a6c15c2b | 1603 | } |
7e936b73 | 1604 | if (unlikely(ino == dir->i_ino)) { |
a34e15cc DH |
1605 | EXT4_ERROR_INODE(dir, "'%pd' linked to parent dir", |
1606 | dentry); | |
6a797d27 | 1607 | return ERR_PTR(-EFSCORRUPTED); |
7e936b73 | 1608 | } |
f4bb2981 | 1609 | inode = ext4_iget_normal(dir->i_sb, ino); |
a9049376 AV |
1610 | if (inode == ERR_PTR(-ESTALE)) { |
1611 | EXT4_ERROR_INODE(dir, | |
1612 | "deleted inode referenced: %u", | |
1613 | ino); | |
6a797d27 | 1614 | return ERR_PTR(-EFSCORRUPTED); |
e6f009b0 | 1615 | } |
d9cdc903 | 1616 | if (!IS_ERR(inode) && ext4_encrypted_inode(dir) && |
ff978b09 | 1617 | (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) && |
a7550b30 | 1618 | !fscrypt_has_permitted_context(dir, inode)) { |
ff978b09 | 1619 | int nokey = ext4_encrypted_inode(inode) && |
a7550b30 | 1620 | !fscrypt_has_encryption_key(inode); |
dd01b690 EB |
1621 | if (nokey) { |
1622 | iput(inode); | |
ff978b09 | 1623 | return ERR_PTR(-ENOKEY); |
dd01b690 | 1624 | } |
d9cdc903 | 1625 | ext4_warning(inode->i_sb, |
8d2ae1cb | 1626 | "Inconsistent encryption contexts: %lu/%lu", |
d9cdc903 TT |
1627 | (unsigned long) dir->i_ino, |
1628 | (unsigned long) inode->i_ino); | |
dd01b690 | 1629 | iput(inode); |
d9cdc903 TT |
1630 | return ERR_PTR(-EPERM); |
1631 | } | |
ac27a0ec DK |
1632 | } |
1633 | return d_splice_alias(inode, dentry); | |
1634 | } | |
1635 | ||
1636 | ||
617ba13b | 1637 | struct dentry *ext4_get_parent(struct dentry *child) |
ac27a0ec | 1638 | { |
498e5f24 | 1639 | __u32 ino; |
26fe5750 | 1640 | static const struct qstr dotdot = QSTR_INIT("..", 2); |
617ba13b | 1641 | struct ext4_dir_entry_2 * de; |
ac27a0ec DK |
1642 | struct buffer_head *bh; |
1643 | ||
2b0143b5 | 1644 | bh = ext4_find_entry(d_inode(child), &dotdot, &de, NULL); |
36de9286 TT |
1645 | if (IS_ERR(bh)) |
1646 | return (struct dentry *) bh; | |
ac27a0ec DK |
1647 | if (!bh) |
1648 | return ERR_PTR(-ENOENT); | |
1649 | ino = le32_to_cpu(de->inode); | |
1650 | brelse(bh); | |
1651 | ||
fc64005c | 1652 | if (!ext4_valid_inum(child->d_sb, ino)) { |
2b0143b5 | 1653 | EXT4_ERROR_INODE(d_inode(child), |
24676da4 | 1654 | "bad parent inode number: %u", ino); |
6a797d27 | 1655 | return ERR_PTR(-EFSCORRUPTED); |
a6c15c2b VA |
1656 | } |
1657 | ||
fc64005c | 1658 | return d_obtain_alias(ext4_iget_normal(child->d_sb, ino)); |
ac27a0ec DK |
1659 | } |
1660 | ||
ef2b02d3 ES |
1661 | /* |
1662 | * Move count entries from end of map between two memory locations. | |
1663 | * Returns pointer to last entry moved. | |
1664 | */ | |
617ba13b | 1665 | static struct ext4_dir_entry_2 * |
3d0518f4 WY |
1666 | dx_move_dirents(char *from, char *to, struct dx_map_entry *map, int count, |
1667 | unsigned blocksize) | |
ac27a0ec DK |
1668 | { |
1669 | unsigned rec_len = 0; | |
1670 | ||
1671 | while (count--) { | |
60e6679e | 1672 | struct ext4_dir_entry_2 *de = (struct ext4_dir_entry_2 *) |
9aee2286 | 1673 | (from + (map->offs<<2)); |
617ba13b | 1674 | rec_len = EXT4_DIR_REC_LEN(de->name_len); |
ac27a0ec | 1675 | memcpy (to, de, rec_len); |
617ba13b | 1676 | ((struct ext4_dir_entry_2 *) to)->rec_len = |
3d0518f4 | 1677 | ext4_rec_len_to_disk(rec_len, blocksize); |
ac27a0ec DK |
1678 | de->inode = 0; |
1679 | map++; | |
1680 | to += rec_len; | |
1681 | } | |
617ba13b | 1682 | return (struct ext4_dir_entry_2 *) (to - rec_len); |
ac27a0ec DK |
1683 | } |
1684 | ||
ef2b02d3 ES |
1685 | /* |
1686 | * Compact each dir entry in the range to the minimal rec_len. | |
1687 | * Returns pointer to last entry in range. | |
1688 | */ | |
8bad4597 | 1689 | static struct ext4_dir_entry_2* dx_pack_dirents(char *base, unsigned blocksize) |
ac27a0ec | 1690 | { |
617ba13b | 1691 | struct ext4_dir_entry_2 *next, *to, *prev, *de = (struct ext4_dir_entry_2 *) base; |
ac27a0ec DK |
1692 | unsigned rec_len = 0; |
1693 | ||
1694 | prev = to = de; | |
8bad4597 | 1695 | while ((char*)de < base + blocksize) { |
3d0518f4 | 1696 | next = ext4_next_entry(de, blocksize); |
ac27a0ec | 1697 | if (de->inode && de->name_len) { |
617ba13b | 1698 | rec_len = EXT4_DIR_REC_LEN(de->name_len); |
ac27a0ec DK |
1699 | if (de > to) |
1700 | memmove(to, de, rec_len); | |
3d0518f4 | 1701 | to->rec_len = ext4_rec_len_to_disk(rec_len, blocksize); |
ac27a0ec | 1702 | prev = to; |
617ba13b | 1703 | to = (struct ext4_dir_entry_2 *) (((char *) to) + rec_len); |
ac27a0ec DK |
1704 | } |
1705 | de = next; | |
1706 | } | |
1707 | return prev; | |
1708 | } | |
1709 | ||
ef2b02d3 ES |
1710 | /* |
1711 | * Split a full leaf block to make room for a new dir entry. | |
1712 | * Allocate a new block, and move entries so that they are approx. equally full. | |
1713 | * Returns pointer to de in block into which the new entry will be inserted. | |
1714 | */ | |
617ba13b | 1715 | static struct ext4_dir_entry_2 *do_split(handle_t *handle, struct inode *dir, |
ac27a0ec | 1716 | struct buffer_head **bh,struct dx_frame *frame, |
f8b3b59d | 1717 | struct dx_hash_info *hinfo) |
ac27a0ec DK |
1718 | { |
1719 | unsigned blocksize = dir->i_sb->s_blocksize; | |
1720 | unsigned count, continued; | |
1721 | struct buffer_head *bh2; | |
725d26d3 | 1722 | ext4_lblk_t newblock; |
ac27a0ec DK |
1723 | u32 hash2; |
1724 | struct dx_map_entry *map; | |
1725 | char *data1 = (*bh)->b_data, *data2; | |
59e315b4 | 1726 | unsigned split, move, size; |
617ba13b | 1727 | struct ext4_dir_entry_2 *de = NULL, *de2; |
b0336e8d DW |
1728 | struct ext4_dir_entry_tail *t; |
1729 | int csum_size = 0; | |
59e315b4 | 1730 | int err = 0, i; |
ac27a0ec | 1731 | |
9aa5d32b | 1732 | if (ext4_has_metadata_csum(dir->i_sb)) |
b0336e8d DW |
1733 | csum_size = sizeof(struct ext4_dir_entry_tail); |
1734 | ||
0f70b406 TT |
1735 | bh2 = ext4_append(handle, dir, &newblock); |
1736 | if (IS_ERR(bh2)) { | |
ac27a0ec DK |
1737 | brelse(*bh); |
1738 | *bh = NULL; | |
f8b3b59d | 1739 | return (struct ext4_dir_entry_2 *) bh2; |
ac27a0ec DK |
1740 | } |
1741 | ||
1742 | BUFFER_TRACE(*bh, "get_write_access"); | |
617ba13b | 1743 | err = ext4_journal_get_write_access(handle, *bh); |
fedee54d DM |
1744 | if (err) |
1745 | goto journal_error; | |
1746 | ||
ac27a0ec | 1747 | BUFFER_TRACE(frame->bh, "get_write_access"); |
617ba13b | 1748 | err = ext4_journal_get_write_access(handle, frame->bh); |
ac27a0ec DK |
1749 | if (err) |
1750 | goto journal_error; | |
1751 | ||
1752 | data2 = bh2->b_data; | |
1753 | ||
1754 | /* create map in the end of data2 block */ | |
1755 | map = (struct dx_map_entry *) (data2 + blocksize); | |
1f3862b5 | 1756 | count = dx_make_map(dir, (struct ext4_dir_entry_2 *) data1, |
ac27a0ec DK |
1757 | blocksize, hinfo, map); |
1758 | map -= count; | |
af5bc92d | 1759 | dx_sort_map(map, count); |
ef2b02d3 ES |
1760 | /* Split the existing block in the middle, size-wise */ |
1761 | size = 0; | |
1762 | move = 0; | |
1763 | for (i = count-1; i >= 0; i--) { | |
1764 | /* is more than half of this entry in 2nd half of the block? */ | |
1765 | if (size + map[i].size/2 > blocksize/2) | |
1766 | break; | |
1767 | size += map[i].size; | |
1768 | move++; | |
1769 | } | |
1770 | /* map index at which we will split */ | |
1771 | split = count - move; | |
ac27a0ec DK |
1772 | hash2 = map[split].hash; |
1773 | continued = hash2 == map[split - 1].hash; | |
725d26d3 AK |
1774 | dxtrace(printk(KERN_INFO "Split block %lu at %x, %i/%i\n", |
1775 | (unsigned long)dx_get_block(frame->at), | |
1776 | hash2, split, count-split)); | |
ac27a0ec DK |
1777 | |
1778 | /* Fancy dance to stay within two buffers */ | |
1f3862b5 MH |
1779 | de2 = dx_move_dirents(data1, data2, map + split, count - split, |
1780 | blocksize); | |
af5bc92d | 1781 | de = dx_pack_dirents(data1, blocksize); |
b0336e8d DW |
1782 | de->rec_len = ext4_rec_len_to_disk(data1 + (blocksize - csum_size) - |
1783 | (char *) de, | |
3d0518f4 | 1784 | blocksize); |
b0336e8d DW |
1785 | de2->rec_len = ext4_rec_len_to_disk(data2 + (blocksize - csum_size) - |
1786 | (char *) de2, | |
3d0518f4 | 1787 | blocksize); |
b0336e8d DW |
1788 | if (csum_size) { |
1789 | t = EXT4_DIRENT_TAIL(data2, blocksize); | |
1790 | initialize_dirent_tail(t, blocksize); | |
1791 | ||
1792 | t = EXT4_DIRENT_TAIL(data1, blocksize); | |
1793 | initialize_dirent_tail(t, blocksize); | |
1794 | } | |
1795 | ||
b3098486 MH |
1796 | dxtrace(dx_show_leaf(dir, hinfo, (struct ext4_dir_entry_2 *) data1, |
1797 | blocksize, 1)); | |
1798 | dxtrace(dx_show_leaf(dir, hinfo, (struct ext4_dir_entry_2 *) data2, | |
1799 | blocksize, 1)); | |
ac27a0ec DK |
1800 | |
1801 | /* Which block gets the new entry? */ | |
f8b3b59d | 1802 | if (hinfo->hash >= hash2) { |
ac27a0ec DK |
1803 | swap(*bh, bh2); |
1804 | de = de2; | |
1805 | } | |
af5bc92d | 1806 | dx_insert_block(frame, hash2 + continued, newblock); |
b0336e8d | 1807 | err = ext4_handle_dirty_dirent_node(handle, dir, bh2); |
ac27a0ec DK |
1808 | if (err) |
1809 | goto journal_error; | |
dbe89444 | 1810 | err = ext4_handle_dirty_dx_node(handle, dir, frame->bh); |
ac27a0ec DK |
1811 | if (err) |
1812 | goto journal_error; | |
af5bc92d TT |
1813 | brelse(bh2); |
1814 | dxtrace(dx_show_index("frame", frame->entries)); | |
ac27a0ec | 1815 | return de; |
fedee54d DM |
1816 | |
1817 | journal_error: | |
1818 | brelse(*bh); | |
1819 | brelse(bh2); | |
1820 | *bh = NULL; | |
1821 | ext4_std_error(dir->i_sb, err); | |
f8b3b59d | 1822 | return ERR_PTR(err); |
ac27a0ec | 1823 | } |
ac27a0ec | 1824 | |
978fef91 TM |
1825 | int ext4_find_dest_de(struct inode *dir, struct inode *inode, |
1826 | struct buffer_head *bh, | |
1827 | void *buf, int buf_size, | |
5b643f9c | 1828 | struct ext4_filename *fname, |
978fef91 TM |
1829 | struct ext4_dir_entry_2 **dest_de) |
1830 | { | |
1831 | struct ext4_dir_entry_2 *de; | |
5b643f9c | 1832 | unsigned short reclen = EXT4_DIR_REC_LEN(fname_len(fname)); |
978fef91 TM |
1833 | int nlen, rlen; |
1834 | unsigned int offset = 0; | |
1835 | char *top; | |
1f3862b5 MH |
1836 | int res; |
1837 | ||
978fef91 TM |
1838 | de = (struct ext4_dir_entry_2 *)buf; |
1839 | top = buf + buf_size - reclen; | |
1840 | while ((char *) de <= top) { | |
1841 | if (ext4_check_dir_entry(dir, NULL, de, bh, | |
1f3862b5 | 1842 | buf, buf_size, offset)) { |
6a797d27 | 1843 | res = -EFSCORRUPTED; |
1f3862b5 MH |
1844 | goto return_result; |
1845 | } | |
1846 | /* Provide crypto context and crypto buffer to ext4 match */ | |
5b643f9c | 1847 | res = ext4_match(fname, de); |
1f3862b5 MH |
1848 | if (res < 0) |
1849 | goto return_result; | |
1850 | if (res > 0) { | |
1851 | res = -EEXIST; | |
1852 | goto return_result; | |
1853 | } | |
978fef91 TM |
1854 | nlen = EXT4_DIR_REC_LEN(de->name_len); |
1855 | rlen = ext4_rec_len_from_disk(de->rec_len, buf_size); | |
1856 | if ((de->inode ? rlen - nlen : rlen) >= reclen) | |
1857 | break; | |
1858 | de = (struct ext4_dir_entry_2 *)((char *)de + rlen); | |
1859 | offset += rlen; | |
1860 | } | |
978fef91 | 1861 | |
1f3862b5 MH |
1862 | if ((char *) de > top) |
1863 | res = -ENOSPC; | |
1864 | else { | |
1865 | *dest_de = de; | |
1866 | res = 0; | |
1867 | } | |
1868 | return_result: | |
1f3862b5 | 1869 | return res; |
978fef91 TM |
1870 | } |
1871 | ||
4bdfc873 MH |
1872 | int ext4_insert_dentry(struct inode *dir, |
1873 | struct inode *inode, | |
1874 | struct ext4_dir_entry_2 *de, | |
1875 | int buf_size, | |
5b643f9c | 1876 | struct ext4_filename *fname) |
978fef91 TM |
1877 | { |
1878 | ||
1879 | int nlen, rlen; | |
1880 | ||
1881 | nlen = EXT4_DIR_REC_LEN(de->name_len); | |
1882 | rlen = ext4_rec_len_from_disk(de->rec_len, buf_size); | |
1883 | if (de->inode) { | |
1884 | struct ext4_dir_entry_2 *de1 = | |
4bdfc873 | 1885 | (struct ext4_dir_entry_2 *)((char *)de + nlen); |
978fef91 TM |
1886 | de1->rec_len = ext4_rec_len_to_disk(rlen - nlen, buf_size); |
1887 | de->rec_len = ext4_rec_len_to_disk(nlen, buf_size); | |
1888 | de = de1; | |
1889 | } | |
1890 | de->file_type = EXT4_FT_UNKNOWN; | |
1891 | de->inode = cpu_to_le32(inode->i_ino); | |
1892 | ext4_set_de_type(inode->i_sb, de, inode->i_mode); | |
5b643f9c TT |
1893 | de->name_len = fname_len(fname); |
1894 | memcpy(de->name, fname_name(fname), fname_len(fname)); | |
4bdfc873 | 1895 | return 0; |
978fef91 | 1896 | } |
4bdfc873 | 1897 | |
ac27a0ec DK |
1898 | /* |
1899 | * Add a new entry into a directory (leaf) block. If de is non-NULL, | |
1900 | * it points to a directory entry which is guaranteed to be large | |
1901 | * enough for new directory entry. If de is NULL, then | |
1902 | * add_dirent_to_buf will attempt search the directory block for | |
1903 | * space. It will return -ENOSPC if no space is available, and -EIO | |
1904 | * and -EEXIST if directory entry already exists. | |
ac27a0ec | 1905 | */ |
5b643f9c TT |
1906 | static int add_dirent_to_buf(handle_t *handle, struct ext4_filename *fname, |
1907 | struct inode *dir, | |
617ba13b | 1908 | struct inode *inode, struct ext4_dir_entry_2 *de, |
af5bc92d | 1909 | struct buffer_head *bh) |
ac27a0ec | 1910 | { |
3d0518f4 | 1911 | unsigned int blocksize = dir->i_sb->s_blocksize; |
b0336e8d | 1912 | int csum_size = 0; |
978fef91 | 1913 | int err; |
b0336e8d | 1914 | |
9aa5d32b | 1915 | if (ext4_has_metadata_csum(inode->i_sb)) |
b0336e8d | 1916 | csum_size = sizeof(struct ext4_dir_entry_tail); |
ac27a0ec | 1917 | |
ac27a0ec | 1918 | if (!de) { |
5b643f9c TT |
1919 | err = ext4_find_dest_de(dir, inode, bh, bh->b_data, |
1920 | blocksize - csum_size, fname, &de); | |
978fef91 TM |
1921 | if (err) |
1922 | return err; | |
ac27a0ec DK |
1923 | } |
1924 | BUFFER_TRACE(bh, "get_write_access"); | |
617ba13b | 1925 | err = ext4_journal_get_write_access(handle, bh); |
ac27a0ec | 1926 | if (err) { |
617ba13b | 1927 | ext4_std_error(dir->i_sb, err); |
ac27a0ec DK |
1928 | return err; |
1929 | } | |
1930 | ||
4bdfc873 MH |
1931 | /* By now the buffer is marked for journaling. Due to crypto operations, |
1932 | * the following function call may fail */ | |
5b643f9c | 1933 | err = ext4_insert_dentry(dir, inode, de, blocksize, fname); |
4bdfc873 MH |
1934 | if (err < 0) |
1935 | return err; | |
978fef91 | 1936 | |
ac27a0ec DK |
1937 | /* |
1938 | * XXX shouldn't update any times until successful | |
1939 | * completion of syscall, but too many callers depend | |
1940 | * on this. | |
1941 | * | |
1942 | * XXX similarly, too many callers depend on | |
617ba13b | 1943 | * ext4_new_inode() setting the times, but error |
ac27a0ec DK |
1944 | * recovery deletes the inode, so the worst that can |
1945 | * happen is that the times are slightly out of date | |
1946 | * and/or different from the directory change time. | |
1947 | */ | |
eeca7ea1 | 1948 | dir->i_mtime = dir->i_ctime = current_time(dir); |
617ba13b | 1949 | ext4_update_dx_flag(dir); |
ac27a0ec | 1950 | dir->i_version++; |
617ba13b | 1951 | ext4_mark_inode_dirty(handle, dir); |
0390131b | 1952 | BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata"); |
b0336e8d | 1953 | err = ext4_handle_dirty_dirent_node(handle, dir, bh); |
ac27a0ec | 1954 | if (err) |
617ba13b | 1955 | ext4_std_error(dir->i_sb, err); |
ac27a0ec DK |
1956 | return 0; |
1957 | } | |
1958 | ||
ac27a0ec DK |
1959 | /* |
1960 | * This converts a one block unindexed directory to a 3 block indexed | |
1961 | * directory, and adds the dentry to the indexed directory. | |
1962 | */ | |
5b643f9c | 1963 | static int make_indexed_dir(handle_t *handle, struct ext4_filename *fname, |
56a04915 | 1964 | struct inode *dir, |
ac27a0ec DK |
1965 | struct inode *inode, struct buffer_head *bh) |
1966 | { | |
ac27a0ec DK |
1967 | struct buffer_head *bh2; |
1968 | struct dx_root *root; | |
1969 | struct dx_frame frames[2], *frame; | |
1970 | struct dx_entry *entries; | |
617ba13b | 1971 | struct ext4_dir_entry_2 *de, *de2; |
b0336e8d | 1972 | struct ext4_dir_entry_tail *t; |
ac27a0ec DK |
1973 | char *data1, *top; |
1974 | unsigned len; | |
1975 | int retval; | |
1976 | unsigned blocksize; | |
725d26d3 | 1977 | ext4_lblk_t block; |
ac27a0ec | 1978 | struct fake_dirent *fde; |
4bdfc873 MH |
1979 | int csum_size = 0; |
1980 | ||
9aa5d32b | 1981 | if (ext4_has_metadata_csum(inode->i_sb)) |
b0336e8d | 1982 | csum_size = sizeof(struct ext4_dir_entry_tail); |
ac27a0ec DK |
1983 | |
1984 | blocksize = dir->i_sb->s_blocksize; | |
e6b8bc09 | 1985 | dxtrace(printk(KERN_DEBUG "Creating index: inode %lu\n", dir->i_ino)); |
5d601255 | 1986 | BUFFER_TRACE(bh, "get_write_access"); |
617ba13b | 1987 | retval = ext4_journal_get_write_access(handle, bh); |
ac27a0ec | 1988 | if (retval) { |
617ba13b | 1989 | ext4_std_error(dir->i_sb, retval); |
ac27a0ec DK |
1990 | brelse(bh); |
1991 | return retval; | |
1992 | } | |
1993 | root = (struct dx_root *) bh->b_data; | |
1994 | ||
e6b8bc09 TT |
1995 | /* The 0th block becomes the root, move the dirents out */ |
1996 | fde = &root->dotdot; | |
1997 | de = (struct ext4_dir_entry_2 *)((char *)fde + | |
3d0518f4 | 1998 | ext4_rec_len_from_disk(fde->rec_len, blocksize)); |
e6b8bc09 | 1999 | if ((char *) de >= (((char *) root) + blocksize)) { |
24676da4 | 2000 | EXT4_ERROR_INODE(dir, "invalid rec_len for '..'"); |
e6b8bc09 | 2001 | brelse(bh); |
6a797d27 | 2002 | return -EFSCORRUPTED; |
e6b8bc09 | 2003 | } |
b0336e8d | 2004 | len = ((char *) root) + (blocksize - csum_size) - (char *) de; |
e6b8bc09 TT |
2005 | |
2006 | /* Allocate new block for the 0th block's dirents */ | |
0f70b406 TT |
2007 | bh2 = ext4_append(handle, dir, &block); |
2008 | if (IS_ERR(bh2)) { | |
ac27a0ec | 2009 | brelse(bh); |
0f70b406 | 2010 | return PTR_ERR(bh2); |
ac27a0ec | 2011 | } |
12e9b892 | 2012 | ext4_set_inode_flag(dir, EXT4_INODE_INDEX); |
ac27a0ec DK |
2013 | data1 = bh2->b_data; |
2014 | ||
ac27a0ec | 2015 | memcpy (data1, de, len); |
617ba13b | 2016 | de = (struct ext4_dir_entry_2 *) data1; |
ac27a0ec | 2017 | top = data1 + len; |
3d0518f4 | 2018 | while ((char *)(de2 = ext4_next_entry(de, blocksize)) < top) |
ac27a0ec | 2019 | de = de2; |
b0336e8d DW |
2020 | de->rec_len = ext4_rec_len_to_disk(data1 + (blocksize - csum_size) - |
2021 | (char *) de, | |
3d0518f4 | 2022 | blocksize); |
b0336e8d DW |
2023 | |
2024 | if (csum_size) { | |
2025 | t = EXT4_DIRENT_TAIL(data1, blocksize); | |
2026 | initialize_dirent_tail(t, blocksize); | |
2027 | } | |
2028 | ||
ac27a0ec | 2029 | /* Initialize the root; the dot dirents already exist */ |
617ba13b | 2030 | de = (struct ext4_dir_entry_2 *) (&root->dotdot); |
3d0518f4 WY |
2031 | de->rec_len = ext4_rec_len_to_disk(blocksize - EXT4_DIR_REC_LEN(2), |
2032 | blocksize); | |
ac27a0ec DK |
2033 | memset (&root->info, 0, sizeof(root->info)); |
2034 | root->info.info_length = sizeof(root->info); | |
617ba13b | 2035 | root->info.hash_version = EXT4_SB(dir->i_sb)->s_def_hash_version; |
ac27a0ec | 2036 | entries = root->entries; |
af5bc92d TT |
2037 | dx_set_block(entries, 1); |
2038 | dx_set_count(entries, 1); | |
2039 | dx_set_limit(entries, dx_root_limit(dir, sizeof(root->info))); | |
ac27a0ec DK |
2040 | |
2041 | /* Initialize as for dx_probe */ | |
5b643f9c TT |
2042 | fname->hinfo.hash_version = root->info.hash_version; |
2043 | if (fname->hinfo.hash_version <= DX_HASH_TEA) | |
2044 | fname->hinfo.hash_version += EXT4_SB(dir->i_sb)->s_hash_unsigned; | |
2045 | fname->hinfo.seed = EXT4_SB(dir->i_sb)->s_hash_seed; | |
2046 | ext4fs_dirhash(fname_name(fname), fname_len(fname), &fname->hinfo); | |
2047 | ||
6050d47a | 2048 | memset(frames, 0, sizeof(frames)); |
ac27a0ec DK |
2049 | frame = frames; |
2050 | frame->entries = entries; | |
2051 | frame->at = entries; | |
2052 | frame->bh = bh; | |
6976a6f2 | 2053 | |
6050d47a JK |
2054 | retval = ext4_handle_dirty_dx_node(handle, dir, frame->bh); |
2055 | if (retval) | |
2056 | goto out_frames; | |
e81d4477 | 2057 | retval = ext4_handle_dirty_dirent_node(handle, dir, bh2); |
6050d47a JK |
2058 | if (retval) |
2059 | goto out_frames; | |
6976a6f2 | 2060 | |
e81d4477 | 2061 | de = do_split(handle,dir, &bh2, frame, &fname->hinfo); |
f8b3b59d | 2062 | if (IS_ERR(de)) { |
6050d47a JK |
2063 | retval = PTR_ERR(de); |
2064 | goto out_frames; | |
7ad8e4e6 | 2065 | } |
ac27a0ec | 2066 | |
e81d4477 | 2067 | retval = add_dirent_to_buf(handle, fname, dir, inode, de, bh2); |
6050d47a JK |
2068 | out_frames: |
2069 | /* | |
2070 | * Even if the block split failed, we have to properly write | |
2071 | * out all the changes we did so far. Otherwise we can end up | |
2072 | * with corrupted filesystem. | |
2073 | */ | |
e81d4477 | 2074 | if (retval) |
2075 | ext4_mark_inode_dirty(handle, dir); | |
6050d47a | 2076 | dx_release(frames); |
e81d4477 | 2077 | brelse(bh2); |
6050d47a | 2078 | return retval; |
ac27a0ec | 2079 | } |
ac27a0ec DK |
2080 | |
2081 | /* | |
617ba13b | 2082 | * ext4_add_entry() |
ac27a0ec DK |
2083 | * |
2084 | * adds a file entry to the specified directory, using the same | |
617ba13b | 2085 | * semantics as ext4_find_entry(). It returns NULL if it failed. |
ac27a0ec DK |
2086 | * |
2087 | * NOTE!! The inode part of 'de' is left at 0 - which means you | |
2088 | * may not sleep between calling this and putting something into | |
2089 | * the entry, as someone else might have used it while you slept. | |
2090 | */ | |
af5bc92d TT |
2091 | static int ext4_add_entry(handle_t *handle, struct dentry *dentry, |
2092 | struct inode *inode) | |
ac27a0ec | 2093 | { |
2b0143b5 | 2094 | struct inode *dir = d_inode(dentry->d_parent); |
e12fb972 | 2095 | struct buffer_head *bh = NULL; |
617ba13b | 2096 | struct ext4_dir_entry_2 *de; |
b0336e8d | 2097 | struct ext4_dir_entry_tail *t; |
af5bc92d | 2098 | struct super_block *sb; |
5b643f9c | 2099 | struct ext4_filename fname; |
ac27a0ec | 2100 | int retval; |
ac27a0ec | 2101 | int dx_fallback=0; |
ac27a0ec | 2102 | unsigned blocksize; |
725d26d3 | 2103 | ext4_lblk_t block, blocks; |
b0336e8d DW |
2104 | int csum_size = 0; |
2105 | ||
9aa5d32b | 2106 | if (ext4_has_metadata_csum(inode->i_sb)) |
b0336e8d | 2107 | csum_size = sizeof(struct ext4_dir_entry_tail); |
ac27a0ec DK |
2108 | |
2109 | sb = dir->i_sb; | |
2110 | blocksize = sb->s_blocksize; | |
2111 | if (!dentry->d_name.len) | |
2112 | return -EINVAL; | |
3c47d541 | 2113 | |
5b643f9c TT |
2114 | retval = ext4_fname_setup_filename(dir, &dentry->d_name, 0, &fname); |
2115 | if (retval) | |
2116 | return retval; | |
2117 | ||
3c47d541 | 2118 | if (ext4_has_inline_data(dir)) { |
56a04915 | 2119 | retval = ext4_try_add_inline_entry(handle, &fname, dir, inode); |
3c47d541 | 2120 | if (retval < 0) |
5b643f9c | 2121 | goto out; |
3c47d541 TM |
2122 | if (retval == 1) { |
2123 | retval = 0; | |
e12fb972 | 2124 | goto out; |
3c47d541 TM |
2125 | } |
2126 | } | |
2127 | ||
ac27a0ec | 2128 | if (is_dx(dir)) { |
56a04915 | 2129 | retval = ext4_dx_add_entry(handle, &fname, dir, inode); |
ac27a0ec | 2130 | if (!retval || (retval != ERR_BAD_DX_DIR)) |
e12fb972 | 2131 | goto out; |
12e9b892 | 2132 | ext4_clear_inode_flag(dir, EXT4_INODE_INDEX); |
ac27a0ec | 2133 | dx_fallback++; |
617ba13b | 2134 | ext4_mark_inode_dirty(handle, dir); |
ac27a0ec | 2135 | } |
ac27a0ec | 2136 | blocks = dir->i_size >> sb->s_blocksize_bits; |
498e5f24 | 2137 | for (block = 0; block < blocks; block++) { |
dc6982ff | 2138 | bh = ext4_read_dirblock(dir, block, DIRENT); |
5b643f9c TT |
2139 | if (IS_ERR(bh)) { |
2140 | retval = PTR_ERR(bh); | |
2141 | bh = NULL; | |
2142 | goto out; | |
2143 | } | |
2144 | retval = add_dirent_to_buf(handle, &fname, dir, inode, | |
2145 | NULL, bh); | |
e12fb972 LC |
2146 | if (retval != -ENOSPC) |
2147 | goto out; | |
ac27a0ec | 2148 | |
ac27a0ec | 2149 | if (blocks == 1 && !dx_fallback && |
e2b911c5 | 2150 | ext4_has_feature_dir_index(sb)) { |
56a04915 | 2151 | retval = make_indexed_dir(handle, &fname, dir, |
5b643f9c | 2152 | inode, bh); |
e12fb972 LC |
2153 | bh = NULL; /* make_indexed_dir releases bh */ |
2154 | goto out; | |
2155 | } | |
ac27a0ec DK |
2156 | brelse(bh); |
2157 | } | |
0f70b406 | 2158 | bh = ext4_append(handle, dir, &block); |
5b643f9c TT |
2159 | if (IS_ERR(bh)) { |
2160 | retval = PTR_ERR(bh); | |
2161 | bh = NULL; | |
2162 | goto out; | |
2163 | } | |
617ba13b | 2164 | de = (struct ext4_dir_entry_2 *) bh->b_data; |
ac27a0ec | 2165 | de->inode = 0; |
b0336e8d DW |
2166 | de->rec_len = ext4_rec_len_to_disk(blocksize - csum_size, blocksize); |
2167 | ||
2168 | if (csum_size) { | |
2169 | t = EXT4_DIRENT_TAIL(bh->b_data, blocksize); | |
2170 | initialize_dirent_tail(t, blocksize); | |
2171 | } | |
2172 | ||
5b643f9c | 2173 | retval = add_dirent_to_buf(handle, &fname, dir, inode, de, bh); |
e12fb972 | 2174 | out: |
5b643f9c | 2175 | ext4_fname_free_filename(&fname); |
2de770a4 | 2176 | brelse(bh); |
14ece102 FM |
2177 | if (retval == 0) |
2178 | ext4_set_inode_state(inode, EXT4_STATE_NEWENTRY); | |
2de770a4 | 2179 | return retval; |
ac27a0ec DK |
2180 | } |
2181 | ||
ac27a0ec DK |
2182 | /* |
2183 | * Returns 0 for success, or a negative error value | |
2184 | */ | |
5b643f9c | 2185 | static int ext4_dx_add_entry(handle_t *handle, struct ext4_filename *fname, |
56a04915 | 2186 | struct inode *dir, struct inode *inode) |
ac27a0ec DK |
2187 | { |
2188 | struct dx_frame frames[2], *frame; | |
2189 | struct dx_entry *entries, *at; | |
af5bc92d | 2190 | struct buffer_head *bh; |
af5bc92d | 2191 | struct super_block *sb = dir->i_sb; |
617ba13b | 2192 | struct ext4_dir_entry_2 *de; |
ac27a0ec DK |
2193 | int err; |
2194 | ||
5b643f9c | 2195 | frame = dx_probe(fname, dir, NULL, frames); |
dd73b5d5 TT |
2196 | if (IS_ERR(frame)) |
2197 | return PTR_ERR(frame); | |
ac27a0ec DK |
2198 | entries = frame->entries; |
2199 | at = frame->at; | |
dc6982ff TT |
2200 | bh = ext4_read_dirblock(dir, dx_get_block(frame->at), DIRENT); |
2201 | if (IS_ERR(bh)) { | |
2202 | err = PTR_ERR(bh); | |
2203 | bh = NULL; | |
ac27a0ec | 2204 | goto cleanup; |
6d1ab10e | 2205 | } |
ac27a0ec DK |
2206 | |
2207 | BUFFER_TRACE(bh, "get_write_access"); | |
617ba13b | 2208 | err = ext4_journal_get_write_access(handle, bh); |
ac27a0ec DK |
2209 | if (err) |
2210 | goto journal_error; | |
2211 | ||
5b643f9c | 2212 | err = add_dirent_to_buf(handle, fname, dir, inode, NULL, bh); |
2de770a4 | 2213 | if (err != -ENOSPC) |
ac27a0ec | 2214 | goto cleanup; |
ac27a0ec DK |
2215 | |
2216 | /* Block full, should compress but for now just split */ | |
4776004f | 2217 | dxtrace(printk(KERN_DEBUG "using %u of %u node entries\n", |
ac27a0ec DK |
2218 | dx_get_count(entries), dx_get_limit(entries))); |
2219 | /* Need to split index? */ | |
2220 | if (dx_get_count(entries) == dx_get_limit(entries)) { | |
725d26d3 | 2221 | ext4_lblk_t newblock; |
ac27a0ec DK |
2222 | unsigned icount = dx_get_count(entries); |
2223 | int levels = frame - frames; | |
2224 | struct dx_entry *entries2; | |
2225 | struct dx_node *node2; | |
2226 | struct buffer_head *bh2; | |
2227 | ||
2228 | if (levels && (dx_get_count(frames->entries) == | |
2229 | dx_get_limit(frames->entries))) { | |
b03a2f7e | 2230 | ext4_warning_inode(dir, "Directory index full!"); |
ac27a0ec DK |
2231 | err = -ENOSPC; |
2232 | goto cleanup; | |
2233 | } | |
0f70b406 TT |
2234 | bh2 = ext4_append(handle, dir, &newblock); |
2235 | if (IS_ERR(bh2)) { | |
2236 | err = PTR_ERR(bh2); | |
ac27a0ec | 2237 | goto cleanup; |
0f70b406 | 2238 | } |
ac27a0ec DK |
2239 | node2 = (struct dx_node *)(bh2->b_data); |
2240 | entries2 = node2->entries; | |
1f7bebb9 | 2241 | memset(&node2->fake, 0, sizeof(struct fake_dirent)); |
3d0518f4 WY |
2242 | node2->fake.rec_len = ext4_rec_len_to_disk(sb->s_blocksize, |
2243 | sb->s_blocksize); | |
ac27a0ec | 2244 | BUFFER_TRACE(frame->bh, "get_write_access"); |
617ba13b | 2245 | err = ext4_journal_get_write_access(handle, frame->bh); |
ac27a0ec DK |
2246 | if (err) |
2247 | goto journal_error; | |
2248 | if (levels) { | |
2249 | unsigned icount1 = icount/2, icount2 = icount - icount1; | |
2250 | unsigned hash2 = dx_get_hash(entries + icount1); | |
4776004f TT |
2251 | dxtrace(printk(KERN_DEBUG "Split index %i/%i\n", |
2252 | icount1, icount2)); | |
ac27a0ec DK |
2253 | |
2254 | BUFFER_TRACE(frame->bh, "get_write_access"); /* index root */ | |
617ba13b | 2255 | err = ext4_journal_get_write_access(handle, |
ac27a0ec DK |
2256 | frames[0].bh); |
2257 | if (err) | |
2258 | goto journal_error; | |
2259 | ||
af5bc92d TT |
2260 | memcpy((char *) entries2, (char *) (entries + icount1), |
2261 | icount2 * sizeof(struct dx_entry)); | |
2262 | dx_set_count(entries, icount1); | |
2263 | dx_set_count(entries2, icount2); | |
2264 | dx_set_limit(entries2, dx_node_limit(dir)); | |
ac27a0ec DK |
2265 | |
2266 | /* Which index block gets the new entry? */ | |
2267 | if (at - entries >= icount1) { | |
2268 | frame->at = at = at - entries - icount1 + entries2; | |
2269 | frame->entries = entries = entries2; | |
2270 | swap(frame->bh, bh2); | |
2271 | } | |
af5bc92d TT |
2272 | dx_insert_block(frames + 0, hash2, newblock); |
2273 | dxtrace(dx_show_index("node", frames[1].entries)); | |
2274 | dxtrace(dx_show_index("node", | |
ac27a0ec | 2275 | ((struct dx_node *) bh2->b_data)->entries)); |
dbe89444 | 2276 | err = ext4_handle_dirty_dx_node(handle, dir, bh2); |
ac27a0ec DK |
2277 | if (err) |
2278 | goto journal_error; | |
2279 | brelse (bh2); | |
2280 | } else { | |
4776004f TT |
2281 | dxtrace(printk(KERN_DEBUG |
2282 | "Creating second level index...\n")); | |
ac27a0ec DK |
2283 | memcpy((char *) entries2, (char *) entries, |
2284 | icount * sizeof(struct dx_entry)); | |
2285 | dx_set_limit(entries2, dx_node_limit(dir)); | |
2286 | ||
2287 | /* Set up root */ | |
2288 | dx_set_count(entries, 1); | |
2289 | dx_set_block(entries + 0, newblock); | |
2290 | ((struct dx_root *) frames[0].bh->b_data)->info.indirect_levels = 1; | |
2291 | ||
2292 | /* Add new access path frame */ | |
2293 | frame = frames + 1; | |
2294 | frame->at = at = at - entries + entries2; | |
2295 | frame->entries = entries = entries2; | |
2296 | frame->bh = bh2; | |
617ba13b | 2297 | err = ext4_journal_get_write_access(handle, |
ac27a0ec DK |
2298 | frame->bh); |
2299 | if (err) | |
2300 | goto journal_error; | |
2301 | } | |
dbe89444 | 2302 | err = ext4_handle_dirty_dx_node(handle, dir, frames[0].bh); |
b4097142 TT |
2303 | if (err) { |
2304 | ext4_std_error(inode->i_sb, err); | |
2305 | goto cleanup; | |
2306 | } | |
ac27a0ec | 2307 | } |
5b643f9c | 2308 | de = do_split(handle, dir, &bh, frame, &fname->hinfo); |
f8b3b59d TT |
2309 | if (IS_ERR(de)) { |
2310 | err = PTR_ERR(de); | |
ac27a0ec | 2311 | goto cleanup; |
f8b3b59d | 2312 | } |
5b643f9c | 2313 | err = add_dirent_to_buf(handle, fname, dir, inode, de, bh); |
ac27a0ec DK |
2314 | goto cleanup; |
2315 | ||
2316 | journal_error: | |
617ba13b | 2317 | ext4_std_error(dir->i_sb, err); |
ac27a0ec | 2318 | cleanup: |
b1deefc9 | 2319 | brelse(bh); |
ac27a0ec DK |
2320 | dx_release(frames); |
2321 | return err; | |
2322 | } | |
ac27a0ec DK |
2323 | |
2324 | /* | |
05019a9e TM |
2325 | * ext4_generic_delete_entry deletes a directory entry by merging it |
2326 | * with the previous entry | |
ac27a0ec | 2327 | */ |
05019a9e TM |
2328 | int ext4_generic_delete_entry(handle_t *handle, |
2329 | struct inode *dir, | |
2330 | struct ext4_dir_entry_2 *de_del, | |
2331 | struct buffer_head *bh, | |
2332 | void *entry_buf, | |
2333 | int buf_size, | |
2334 | int csum_size) | |
ac27a0ec | 2335 | { |
af5bc92d | 2336 | struct ext4_dir_entry_2 *de, *pde; |
3d0518f4 | 2337 | unsigned int blocksize = dir->i_sb->s_blocksize; |
05019a9e | 2338 | int i; |
b0336e8d | 2339 | |
ac27a0ec DK |
2340 | i = 0; |
2341 | pde = NULL; | |
05019a9e TM |
2342 | de = (struct ext4_dir_entry_2 *)entry_buf; |
2343 | while (i < buf_size - csum_size) { | |
226ba972 TM |
2344 | if (ext4_check_dir_entry(dir, NULL, de, bh, |
2345 | bh->b_data, bh->b_size, i)) | |
6a797d27 | 2346 | return -EFSCORRUPTED; |
ac27a0ec | 2347 | if (de == de_del) { |
ac27a0ec | 2348 | if (pde) |
a72d7f83 | 2349 | pde->rec_len = ext4_rec_len_to_disk( |
3d0518f4 WY |
2350 | ext4_rec_len_from_disk(pde->rec_len, |
2351 | blocksize) + | |
2352 | ext4_rec_len_from_disk(de->rec_len, | |
2353 | blocksize), | |
2354 | blocksize); | |
ac27a0ec DK |
2355 | else |
2356 | de->inode = 0; | |
2357 | dir->i_version++; | |
ac27a0ec DK |
2358 | return 0; |
2359 | } | |
3d0518f4 | 2360 | i += ext4_rec_len_from_disk(de->rec_len, blocksize); |
ac27a0ec | 2361 | pde = de; |
3d0518f4 | 2362 | de = ext4_next_entry(de, blocksize); |
ac27a0ec DK |
2363 | } |
2364 | return -ENOENT; | |
2365 | } | |
2366 | ||
05019a9e TM |
2367 | static int ext4_delete_entry(handle_t *handle, |
2368 | struct inode *dir, | |
2369 | struct ext4_dir_entry_2 *de_del, | |
2370 | struct buffer_head *bh) | |
2371 | { | |
2372 | int err, csum_size = 0; | |
2373 | ||
9f40fe54 TM |
2374 | if (ext4_has_inline_data(dir)) { |
2375 | int has_inline_data = 1; | |
2376 | err = ext4_delete_inline_entry(handle, dir, de_del, bh, | |
2377 | &has_inline_data); | |
2378 | if (has_inline_data) | |
2379 | return err; | |
2380 | } | |
2381 | ||
9aa5d32b | 2382 | if (ext4_has_metadata_csum(dir->i_sb)) |
05019a9e TM |
2383 | csum_size = sizeof(struct ext4_dir_entry_tail); |
2384 | ||
2385 | BUFFER_TRACE(bh, "get_write_access"); | |
2386 | err = ext4_journal_get_write_access(handle, bh); | |
2387 | if (unlikely(err)) | |
2388 | goto out; | |
2389 | ||
2390 | err = ext4_generic_delete_entry(handle, dir, de_del, | |
2391 | bh, bh->b_data, | |
2392 | dir->i_sb->s_blocksize, csum_size); | |
2393 | if (err) | |
2394 | goto out; | |
2395 | ||
2396 | BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata"); | |
2397 | err = ext4_handle_dirty_dirent_node(handle, dir, bh); | |
2398 | if (unlikely(err)) | |
2399 | goto out; | |
2400 | ||
2401 | return 0; | |
2402 | out: | |
2403 | if (err != -ENOENT) | |
2404 | ext4_std_error(dir->i_sb, err); | |
2405 | return err; | |
2406 | } | |
2407 | ||
f8628a14 AD |
2408 | /* |
2409 | * DIR_NLINK feature is set if 1) nlinks > EXT4_LINK_MAX or 2) nlinks == 2, | |
2410 | * since this indicates that nlinks count was previously 1. | |
2411 | */ | |
2412 | static void ext4_inc_count(handle_t *handle, struct inode *inode) | |
2413 | { | |
2414 | inc_nlink(inode); | |
2415 | if (is_dx(inode) && inode->i_nlink > 1) { | |
2416 | /* limit is 16-bit i_links_count */ | |
2417 | if (inode->i_nlink >= EXT4_LINK_MAX || inode->i_nlink == 2) { | |
bfe86848 | 2418 | set_nlink(inode, 1); |
e2b911c5 | 2419 | ext4_set_feature_dir_nlink(inode->i_sb); |
f8628a14 AD |
2420 | } |
2421 | } | |
2422 | } | |
2423 | ||
2424 | /* | |
2425 | * If a directory had nlink == 1, then we should let it be 1. This indicates | |
2426 | * directory has >EXT4_LINK_MAX subdirs. | |
2427 | */ | |
2428 | static void ext4_dec_count(handle_t *handle, struct inode *inode) | |
2429 | { | |
909a4cf1 AD |
2430 | if (!S_ISDIR(inode->i_mode) || inode->i_nlink > 2) |
2431 | drop_nlink(inode); | |
f8628a14 AD |
2432 | } |
2433 | ||
2434 | ||
617ba13b | 2435 | static int ext4_add_nondir(handle_t *handle, |
ac27a0ec DK |
2436 | struct dentry *dentry, struct inode *inode) |
2437 | { | |
617ba13b | 2438 | int err = ext4_add_entry(handle, dentry, inode); |
ac27a0ec | 2439 | if (!err) { |
617ba13b | 2440 | ext4_mark_inode_dirty(handle, inode); |
6b38e842 | 2441 | unlock_new_inode(inode); |
8fc37ec5 | 2442 | d_instantiate(dentry, inode); |
ac27a0ec DK |
2443 | return 0; |
2444 | } | |
731b9a54 | 2445 | drop_nlink(inode); |
6b38e842 | 2446 | unlock_new_inode(inode); |
ac27a0ec DK |
2447 | iput(inode); |
2448 | return err; | |
2449 | } | |
2450 | ||
2451 | /* | |
2452 | * By the time this is called, we already have created | |
2453 | * the directory cache entry for the new file, but it | |
2454 | * is so far negative - it has no inode. | |
2455 | * | |
2456 | * If the create succeeds, we fill in the inode information | |
2457 | * with d_instantiate(). | |
2458 | */ | |
4acdaf27 | 2459 | static int ext4_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
ebfc3b49 | 2460 | bool excl) |
ac27a0ec DK |
2461 | { |
2462 | handle_t *handle; | |
af5bc92d | 2463 | struct inode *inode; |
1139575a | 2464 | int err, credits, retries = 0; |
ac27a0ec | 2465 | |
a7cdadee JK |
2466 | err = dquot_initialize(dir); |
2467 | if (err) | |
2468 | return err; | |
907f4554 | 2469 | |
1139575a | 2470 | credits = (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) + |
eb9cc7e1 | 2471 | EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3); |
ac27a0ec | 2472 | retry: |
1139575a TT |
2473 | inode = ext4_new_inode_start_handle(dir, mode, &dentry->d_name, 0, |
2474 | NULL, EXT4_HT_DIR, credits); | |
2475 | handle = ext4_journal_current_handle(); | |
ac27a0ec DK |
2476 | err = PTR_ERR(inode); |
2477 | if (!IS_ERR(inode)) { | |
617ba13b | 2478 | inode->i_op = &ext4_file_inode_operations; |
be64f884 | 2479 | inode->i_fop = &ext4_file_operations; |
617ba13b | 2480 | ext4_set_aops(inode); |
e709e9df | 2481 | err = ext4_add_nondir(handle, dentry, inode); |
1139575a TT |
2482 | if (!err && IS_DIRSYNC(dir)) |
2483 | ext4_handle_sync(handle); | |
ac27a0ec | 2484 | } |
1139575a TT |
2485 | if (handle) |
2486 | ext4_journal_stop(handle); | |
617ba13b | 2487 | if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries)) |
ac27a0ec DK |
2488 | goto retry; |
2489 | return err; | |
2490 | } | |
2491 | ||
af5bc92d | 2492 | static int ext4_mknod(struct inode *dir, struct dentry *dentry, |
1a67aafb | 2493 | umode_t mode, dev_t rdev) |
ac27a0ec DK |
2494 | { |
2495 | handle_t *handle; | |
2496 | struct inode *inode; | |
1139575a | 2497 | int err, credits, retries = 0; |
ac27a0ec | 2498 | |
a7cdadee JK |
2499 | err = dquot_initialize(dir); |
2500 | if (err) | |
2501 | return err; | |
907f4554 | 2502 | |
1139575a | 2503 | credits = (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) + |
eb9cc7e1 | 2504 | EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3); |
ac27a0ec | 2505 | retry: |
1139575a TT |
2506 | inode = ext4_new_inode_start_handle(dir, mode, &dentry->d_name, 0, |
2507 | NULL, EXT4_HT_DIR, credits); | |
2508 | handle = ext4_journal_current_handle(); | |
ac27a0ec DK |
2509 | err = PTR_ERR(inode); |
2510 | if (!IS_ERR(inode)) { | |
2511 | init_special_inode(inode, inode->i_mode, rdev); | |
617ba13b | 2512 | inode->i_op = &ext4_special_inode_operations; |
617ba13b | 2513 | err = ext4_add_nondir(handle, dentry, inode); |
1139575a TT |
2514 | if (!err && IS_DIRSYNC(dir)) |
2515 | ext4_handle_sync(handle); | |
ac27a0ec | 2516 | } |
1139575a TT |
2517 | if (handle) |
2518 | ext4_journal_stop(handle); | |
617ba13b | 2519 | if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries)) |
ac27a0ec DK |
2520 | goto retry; |
2521 | return err; | |
2522 | } | |
2523 | ||
af51a2ac AV |
2524 | static int ext4_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode) |
2525 | { | |
2526 | handle_t *handle; | |
2527 | struct inode *inode; | |
2528 | int err, retries = 0; | |
2529 | ||
a7cdadee JK |
2530 | err = dquot_initialize(dir); |
2531 | if (err) | |
2532 | return err; | |
af51a2ac AV |
2533 | |
2534 | retry: | |
2535 | inode = ext4_new_inode_start_handle(dir, mode, | |
2536 | NULL, 0, NULL, | |
2537 | EXT4_HT_DIR, | |
2538 | EXT4_MAXQUOTAS_INIT_BLOCKS(dir->i_sb) + | |
2539 | 4 + EXT4_XATTR_TRANS_BLOCKS); | |
2540 | handle = ext4_journal_current_handle(); | |
2541 | err = PTR_ERR(inode); | |
2542 | if (!IS_ERR(inode)) { | |
2543 | inode->i_op = &ext4_file_inode_operations; | |
be64f884 | 2544 | inode->i_fop = &ext4_file_operations; |
af51a2ac | 2545 | ext4_set_aops(inode); |
e94bd349 | 2546 | d_tmpfile(dentry, inode); |
af51a2ac AV |
2547 | err = ext4_orphan_add(handle, inode); |
2548 | if (err) | |
43ae9e3f | 2549 | goto err_unlock_inode; |
af51a2ac | 2550 | mark_inode_dirty(inode); |
af51a2ac AV |
2551 | unlock_new_inode(inode); |
2552 | } | |
2553 | if (handle) | |
2554 | ext4_journal_stop(handle); | |
2555 | if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries)) | |
2556 | goto retry; | |
2557 | return err; | |
43ae9e3f | 2558 | err_unlock_inode: |
af51a2ac AV |
2559 | ext4_journal_stop(handle); |
2560 | unlock_new_inode(inode); | |
af51a2ac AV |
2561 | return err; |
2562 | } | |
2563 | ||
a774f9c2 TM |
2564 | struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, |
2565 | struct ext4_dir_entry_2 *de, | |
2566 | int blocksize, int csum_size, | |
2567 | unsigned int parent_ino, int dotdot_real_len) | |
2568 | { | |
2569 | de->inode = cpu_to_le32(inode->i_ino); | |
2570 | de->name_len = 1; | |
2571 | de->rec_len = ext4_rec_len_to_disk(EXT4_DIR_REC_LEN(de->name_len), | |
2572 | blocksize); | |
2573 | strcpy(de->name, "."); | |
2574 | ext4_set_de_type(inode->i_sb, de, S_IFDIR); | |
2575 | ||
2576 | de = ext4_next_entry(de, blocksize); | |
2577 | de->inode = cpu_to_le32(parent_ino); | |
2578 | de->name_len = 2; | |
2579 | if (!dotdot_real_len) | |
2580 | de->rec_len = ext4_rec_len_to_disk(blocksize - | |
2581 | (csum_size + EXT4_DIR_REC_LEN(1)), | |
2582 | blocksize); | |
2583 | else | |
2584 | de->rec_len = ext4_rec_len_to_disk( | |
2585 | EXT4_DIR_REC_LEN(de->name_len), blocksize); | |
2586 | strcpy(de->name, ".."); | |
2587 | ext4_set_de_type(inode->i_sb, de, S_IFDIR); | |
2588 | ||
2589 | return ext4_next_entry(de, blocksize); | |
2590 | } | |
2591 | ||
2592 | static int ext4_init_new_dir(handle_t *handle, struct inode *dir, | |
2593 | struct inode *inode) | |
ac27a0ec | 2594 | { |
dabd991f | 2595 | struct buffer_head *dir_block = NULL; |
af5bc92d | 2596 | struct ext4_dir_entry_2 *de; |
b0336e8d | 2597 | struct ext4_dir_entry_tail *t; |
dc6982ff | 2598 | ext4_lblk_t block = 0; |
3d0518f4 | 2599 | unsigned int blocksize = dir->i_sb->s_blocksize; |
b0336e8d | 2600 | int csum_size = 0; |
a774f9c2 | 2601 | int err; |
ac27a0ec | 2602 | |
9aa5d32b | 2603 | if (ext4_has_metadata_csum(dir->i_sb)) |
b0336e8d DW |
2604 | csum_size = sizeof(struct ext4_dir_entry_tail); |
2605 | ||
3c47d541 TM |
2606 | if (ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) { |
2607 | err = ext4_try_create_inline_dir(handle, dir, inode); | |
2608 | if (err < 0 && err != -ENOSPC) | |
2609 | goto out; | |
2610 | if (!err) | |
2611 | goto out; | |
2612 | } | |
2613 | ||
dc6982ff | 2614 | inode->i_size = 0; |
0f70b406 TT |
2615 | dir_block = ext4_append(handle, inode, &block); |
2616 | if (IS_ERR(dir_block)) | |
2617 | return PTR_ERR(dir_block); | |
a774f9c2 TM |
2618 | de = (struct ext4_dir_entry_2 *)dir_block->b_data; |
2619 | ext4_init_dot_dotdot(inode, de, blocksize, csum_size, dir->i_ino, 0); | |
2620 | set_nlink(inode, 2); | |
2621 | if (csum_size) { | |
2622 | t = EXT4_DIRENT_TAIL(dir_block->b_data, blocksize); | |
2623 | initialize_dirent_tail(t, blocksize); | |
2624 | } | |
2625 | ||
2626 | BUFFER_TRACE(dir_block, "call ext4_handle_dirty_metadata"); | |
2627 | err = ext4_handle_dirty_dirent_node(handle, inode, dir_block); | |
2628 | if (err) | |
2629 | goto out; | |
2630 | set_buffer_verified(dir_block); | |
2631 | out: | |
2632 | brelse(dir_block); | |
2633 | return err; | |
2634 | } | |
2635 | ||
2636 | static int ext4_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) | |
2637 | { | |
2638 | handle_t *handle; | |
2639 | struct inode *inode; | |
1139575a | 2640 | int err, credits, retries = 0; |
a774f9c2 | 2641 | |
f8628a14 | 2642 | if (EXT4_DIR_LINK_MAX(dir)) |
ac27a0ec DK |
2643 | return -EMLINK; |
2644 | ||
a7cdadee JK |
2645 | err = dquot_initialize(dir); |
2646 | if (err) | |
2647 | return err; | |
907f4554 | 2648 | |
1139575a | 2649 | credits = (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) + |
eb9cc7e1 | 2650 | EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3); |
ac27a0ec | 2651 | retry: |
1139575a TT |
2652 | inode = ext4_new_inode_start_handle(dir, S_IFDIR | mode, |
2653 | &dentry->d_name, | |
2654 | 0, NULL, EXT4_HT_DIR, credits); | |
2655 | handle = ext4_journal_current_handle(); | |
ac27a0ec DK |
2656 | err = PTR_ERR(inode); |
2657 | if (IS_ERR(inode)) | |
2658 | goto out_stop; | |
2659 | ||
617ba13b MC |
2660 | inode->i_op = &ext4_dir_inode_operations; |
2661 | inode->i_fop = &ext4_dir_operations; | |
a774f9c2 | 2662 | err = ext4_init_new_dir(handle, dir, inode); |
dabd991f NK |
2663 | if (err) |
2664 | goto out_clear_inode; | |
2665 | err = ext4_mark_inode_dirty(handle, inode); | |
2666 | if (!err) | |
2667 | err = ext4_add_entry(handle, dentry, inode); | |
ac27a0ec | 2668 | if (err) { |
4cdeed86 AK |
2669 | out_clear_inode: |
2670 | clear_nlink(inode); | |
6b38e842 | 2671 | unlock_new_inode(inode); |
617ba13b | 2672 | ext4_mark_inode_dirty(handle, inode); |
af5bc92d | 2673 | iput(inode); |
ac27a0ec DK |
2674 | goto out_stop; |
2675 | } | |
f8628a14 | 2676 | ext4_inc_count(handle, dir); |
617ba13b | 2677 | ext4_update_dx_flag(dir); |
dabd991f NK |
2678 | err = ext4_mark_inode_dirty(handle, dir); |
2679 | if (err) | |
2680 | goto out_clear_inode; | |
6b38e842 | 2681 | unlock_new_inode(inode); |
8fc37ec5 | 2682 | d_instantiate(dentry, inode); |
1139575a TT |
2683 | if (IS_DIRSYNC(dir)) |
2684 | ext4_handle_sync(handle); | |
2685 | ||
ac27a0ec | 2686 | out_stop: |
1139575a TT |
2687 | if (handle) |
2688 | ext4_journal_stop(handle); | |
617ba13b | 2689 | if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries)) |
ac27a0ec DK |
2690 | goto retry; |
2691 | return err; | |
2692 | } | |
2693 | ||
2694 | /* | |
2695 | * routine to check that the specified directory is empty (for rmdir) | |
2696 | */ | |
a7550b30 | 2697 | bool ext4_empty_dir(struct inode *inode) |
ac27a0ec | 2698 | { |
498e5f24 | 2699 | unsigned int offset; |
af5bc92d TT |
2700 | struct buffer_head *bh; |
2701 | struct ext4_dir_entry_2 *de, *de1; | |
2702 | struct super_block *sb; | |
ac27a0ec | 2703 | |
61f86638 TM |
2704 | if (ext4_has_inline_data(inode)) { |
2705 | int has_inline_data = 1; | |
a7550b30 | 2706 | int ret; |
61f86638 | 2707 | |
a7550b30 | 2708 | ret = empty_inline_dir(inode, &has_inline_data); |
61f86638 | 2709 | if (has_inline_data) |
a7550b30 | 2710 | return ret; |
61f86638 TM |
2711 | } |
2712 | ||
ac27a0ec | 2713 | sb = inode->i_sb; |
dc6982ff TT |
2714 | if (inode->i_size < EXT4_DIR_REC_LEN(1) + EXT4_DIR_REC_LEN(2)) { |
2715 | EXT4_ERROR_INODE(inode, "invalid size"); | |
a7550b30 | 2716 | return true; |
ac27a0ec | 2717 | } |
dc6982ff TT |
2718 | bh = ext4_read_dirblock(inode, 0, EITHER); |
2719 | if (IS_ERR(bh)) | |
a7550b30 | 2720 | return true; |
dc6982ff | 2721 | |
617ba13b | 2722 | de = (struct ext4_dir_entry_2 *) bh->b_data; |
3d0518f4 | 2723 | de1 = ext4_next_entry(de, sb->s_blocksize); |
ac27a0ec | 2724 | if (le32_to_cpu(de->inode) != inode->i_ino || |
b03a2f7e AD |
2725 | le32_to_cpu(de1->inode) == 0 || |
2726 | strcmp(".", de->name) || strcmp("..", de1->name)) { | |
2727 | ext4_warning_inode(inode, "directory missing '.' and/or '..'"); | |
af5bc92d | 2728 | brelse(bh); |
a7550b30 | 2729 | return true; |
ac27a0ec | 2730 | } |
3d0518f4 WY |
2731 | offset = ext4_rec_len_from_disk(de->rec_len, sb->s_blocksize) + |
2732 | ext4_rec_len_from_disk(de1->rec_len, sb->s_blocksize); | |
2733 | de = ext4_next_entry(de1, sb->s_blocksize); | |
af5bc92d | 2734 | while (offset < inode->i_size) { |
236f5ecb | 2735 | if ((void *) de >= (void *) (bh->b_data+sb->s_blocksize)) { |
24676da4 | 2736 | unsigned int lblock; |
af5bc92d | 2737 | brelse(bh); |
24676da4 | 2738 | lblock = offset >> EXT4_BLOCK_SIZE_BITS(sb); |
dc6982ff TT |
2739 | bh = ext4_read_dirblock(inode, lblock, EITHER); |
2740 | if (IS_ERR(bh)) | |
a7550b30 | 2741 | return true; |
617ba13b | 2742 | de = (struct ext4_dir_entry_2 *) bh->b_data; |
ac27a0ec | 2743 | } |
226ba972 TM |
2744 | if (ext4_check_dir_entry(inode, NULL, de, bh, |
2745 | bh->b_data, bh->b_size, offset)) { | |
617ba13b | 2746 | de = (struct ext4_dir_entry_2 *)(bh->b_data + |
ac27a0ec DK |
2747 | sb->s_blocksize); |
2748 | offset = (offset | (sb->s_blocksize - 1)) + 1; | |
2749 | continue; | |
2750 | } | |
2751 | if (le32_to_cpu(de->inode)) { | |
af5bc92d | 2752 | brelse(bh); |
a7550b30 | 2753 | return false; |
ac27a0ec | 2754 | } |
3d0518f4 WY |
2755 | offset += ext4_rec_len_from_disk(de->rec_len, sb->s_blocksize); |
2756 | de = ext4_next_entry(de, sb->s_blocksize); | |
ac27a0ec | 2757 | } |
af5bc92d | 2758 | brelse(bh); |
a7550b30 | 2759 | return true; |
ac27a0ec DK |
2760 | } |
2761 | ||
d745a8c2 JK |
2762 | /* |
2763 | * ext4_orphan_add() links an unlinked or truncated inode into a list of | |
ac27a0ec DK |
2764 | * such inodes, starting at the superblock, in case we crash before the |
2765 | * file is closed/deleted, or in case the inode truncate spans multiple | |
2766 | * transactions and the last transaction is not recovered after a crash. | |
2767 | * | |
2768 | * At filesystem recovery time, we walk this list deleting unlinked | |
617ba13b | 2769 | * inodes and truncating linked inodes in ext4_orphan_cleanup(). |
d745a8c2 JK |
2770 | * |
2771 | * Orphan list manipulation functions must be called under i_mutex unless | |
2772 | * we are just creating the inode or deleting it. | |
ac27a0ec | 2773 | */ |
617ba13b | 2774 | int ext4_orphan_add(handle_t *handle, struct inode *inode) |
ac27a0ec DK |
2775 | { |
2776 | struct super_block *sb = inode->i_sb; | |
cd2c080c | 2777 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
617ba13b | 2778 | struct ext4_iloc iloc; |
ac27a0ec | 2779 | int err = 0, rc; |
d745a8c2 | 2780 | bool dirty = false; |
ac27a0ec | 2781 | |
e2bfb088 | 2782 | if (!sbi->s_journal || is_bad_inode(inode)) |
0390131b FM |
2783 | return 0; |
2784 | ||
d745a8c2 | 2785 | WARN_ON_ONCE(!(inode->i_state & (I_NEW | I_FREEING)) && |
5955102c | 2786 | !inode_is_locked(inode)); |
d745a8c2 JK |
2787 | /* |
2788 | * Exit early if inode already is on orphan list. This is a big speedup | |
2789 | * since we don't have to contend on the global s_orphan_lock. | |
2790 | */ | |
617ba13b | 2791 | if (!list_empty(&EXT4_I(inode)->i_orphan)) |
d745a8c2 | 2792 | return 0; |
ac27a0ec | 2793 | |
afb86178 LC |
2794 | /* |
2795 | * Orphan handling is only valid for files with data blocks | |
2796 | * being truncated, or files being unlinked. Note that we either | |
2797 | * hold i_mutex, or the inode can not be referenced from outside, | |
2798 | * so i_nlink should not be bumped due to race | |
ac27a0ec | 2799 | */ |
af5bc92d TT |
2800 | J_ASSERT((S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || |
2801 | S_ISLNK(inode->i_mode)) || inode->i_nlink == 0); | |
ac27a0ec | 2802 | |
cd2c080c JK |
2803 | BUFFER_TRACE(sbi->s_sbh, "get_write_access"); |
2804 | err = ext4_journal_get_write_access(handle, sbi->s_sbh); | |
ac27a0ec | 2805 | if (err) |
d745a8c2 | 2806 | goto out; |
ac27a0ec | 2807 | |
617ba13b | 2808 | err = ext4_reserve_inode_write(handle, inode, &iloc); |
ac27a0ec | 2809 | if (err) |
d745a8c2 JK |
2810 | goto out; |
2811 | ||
2812 | mutex_lock(&sbi->s_orphan_lock); | |
6e3617e5 DM |
2813 | /* |
2814 | * Due to previous errors inode may be already a part of on-disk | |
2815 | * orphan list. If so skip on-disk list modification. | |
2816 | */ | |
d745a8c2 JK |
2817 | if (!NEXT_ORPHAN(inode) || NEXT_ORPHAN(inode) > |
2818 | (le32_to_cpu(sbi->s_es->s_inodes_count))) { | |
2819 | /* Insert this inode at the head of the on-disk orphan list */ | |
2820 | NEXT_ORPHAN(inode) = le32_to_cpu(sbi->s_es->s_last_orphan); | |
2821 | sbi->s_es->s_last_orphan = cpu_to_le32(inode->i_ino); | |
2822 | dirty = true; | |
2823 | } | |
2824 | list_add(&EXT4_I(inode)->i_orphan, &sbi->s_orphan); | |
2825 | mutex_unlock(&sbi->s_orphan_lock); | |
ac27a0ec | 2826 | |
d745a8c2 JK |
2827 | if (dirty) { |
2828 | err = ext4_handle_dirty_super(handle, sb); | |
2829 | rc = ext4_mark_iloc_dirty(handle, inode, &iloc); | |
2830 | if (!err) | |
2831 | err = rc; | |
2832 | if (err) { | |
2833 | /* | |
2834 | * We have to remove inode from in-memory list if | |
2835 | * addition to on disk orphan list failed. Stray orphan | |
2836 | * list entries can cause panics at unmount time. | |
2837 | */ | |
2838 | mutex_lock(&sbi->s_orphan_lock); | |
74177f55 | 2839 | list_del_init(&EXT4_I(inode)->i_orphan); |
d745a8c2 JK |
2840 | mutex_unlock(&sbi->s_orphan_lock); |
2841 | } | |
2842 | } | |
ac27a0ec DK |
2843 | jbd_debug(4, "superblock will point to %lu\n", inode->i_ino); |
2844 | jbd_debug(4, "orphan inode %lu will point to %d\n", | |
2845 | inode->i_ino, NEXT_ORPHAN(inode)); | |
d745a8c2 | 2846 | out: |
cd2c080c | 2847 | ext4_std_error(sb, err); |
ac27a0ec DK |
2848 | return err; |
2849 | } | |
2850 | ||
2851 | /* | |
617ba13b | 2852 | * ext4_orphan_del() removes an unlinked or truncated inode from the list |
ac27a0ec DK |
2853 | * of such inodes stored on disk, because it is finally being cleaned up. |
2854 | */ | |
617ba13b | 2855 | int ext4_orphan_del(handle_t *handle, struct inode *inode) |
ac27a0ec DK |
2856 | { |
2857 | struct list_head *prev; | |
617ba13b | 2858 | struct ext4_inode_info *ei = EXT4_I(inode); |
cd2c080c | 2859 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
498e5f24 | 2860 | __u32 ino_next; |
617ba13b | 2861 | struct ext4_iloc iloc; |
ac27a0ec DK |
2862 | int err = 0; |
2863 | ||
cd2c080c | 2864 | if (!sbi->s_journal && !(sbi->s_mount_state & EXT4_ORPHAN_FS)) |
0390131b FM |
2865 | return 0; |
2866 | ||
d745a8c2 | 2867 | WARN_ON_ONCE(!(inode->i_state & (I_NEW | I_FREEING)) && |
5955102c | 2868 | !inode_is_locked(inode)); |
d745a8c2 | 2869 | /* Do this quick check before taking global s_orphan_lock. */ |
3b9d4ed2 | 2870 | if (list_empty(&ei->i_orphan)) |
d745a8c2 | 2871 | return 0; |
ac27a0ec | 2872 | |
d745a8c2 JK |
2873 | if (handle) { |
2874 | /* Grab inode buffer early before taking global s_orphan_lock */ | |
2875 | err = ext4_reserve_inode_write(handle, inode, &iloc); | |
2876 | } | |
ac27a0ec | 2877 | |
d745a8c2 | 2878 | mutex_lock(&sbi->s_orphan_lock); |
ac27a0ec DK |
2879 | jbd_debug(4, "remove inode %lu from orphan list\n", inode->i_ino); |
2880 | ||
d745a8c2 | 2881 | prev = ei->i_orphan.prev; |
ac27a0ec DK |
2882 | list_del_init(&ei->i_orphan); |
2883 | ||
2884 | /* If we're on an error path, we may not have a valid | |
2885 | * transaction handle with which to update the orphan list on | |
2886 | * disk, but we still need to remove the inode from the linked | |
2887 | * list in memory. */ | |
d745a8c2 JK |
2888 | if (!handle || err) { |
2889 | mutex_unlock(&sbi->s_orphan_lock); | |
ac27a0ec | 2890 | goto out_err; |
d745a8c2 | 2891 | } |
ac27a0ec | 2892 | |
d745a8c2 | 2893 | ino_next = NEXT_ORPHAN(inode); |
ac27a0ec | 2894 | if (prev == &sbi->s_orphan) { |
498e5f24 | 2895 | jbd_debug(4, "superblock will point to %u\n", ino_next); |
ac27a0ec | 2896 | BUFFER_TRACE(sbi->s_sbh, "get_write_access"); |
617ba13b | 2897 | err = ext4_journal_get_write_access(handle, sbi->s_sbh); |
d745a8c2 JK |
2898 | if (err) { |
2899 | mutex_unlock(&sbi->s_orphan_lock); | |
ac27a0ec | 2900 | goto out_brelse; |
d745a8c2 | 2901 | } |
ac27a0ec | 2902 | sbi->s_es->s_last_orphan = cpu_to_le32(ino_next); |
d745a8c2 | 2903 | mutex_unlock(&sbi->s_orphan_lock); |
b50924c2 | 2904 | err = ext4_handle_dirty_super(handle, inode->i_sb); |
ac27a0ec | 2905 | } else { |
617ba13b | 2906 | struct ext4_iloc iloc2; |
ac27a0ec | 2907 | struct inode *i_prev = |
617ba13b | 2908 | &list_entry(prev, struct ext4_inode_info, i_orphan)->vfs_inode; |
ac27a0ec | 2909 | |
498e5f24 | 2910 | jbd_debug(4, "orphan inode %lu will point to %u\n", |
ac27a0ec | 2911 | i_prev->i_ino, ino_next); |
617ba13b | 2912 | err = ext4_reserve_inode_write(handle, i_prev, &iloc2); |
d745a8c2 JK |
2913 | if (err) { |
2914 | mutex_unlock(&sbi->s_orphan_lock); | |
ac27a0ec | 2915 | goto out_brelse; |
d745a8c2 | 2916 | } |
ac27a0ec | 2917 | NEXT_ORPHAN(i_prev) = ino_next; |
617ba13b | 2918 | err = ext4_mark_iloc_dirty(handle, i_prev, &iloc2); |
d745a8c2 | 2919 | mutex_unlock(&sbi->s_orphan_lock); |
ac27a0ec DK |
2920 | } |
2921 | if (err) | |
2922 | goto out_brelse; | |
2923 | NEXT_ORPHAN(inode) = 0; | |
617ba13b | 2924 | err = ext4_mark_iloc_dirty(handle, inode, &iloc); |
ac27a0ec | 2925 | out_err: |
617ba13b | 2926 | ext4_std_error(inode->i_sb, err); |
ac27a0ec DK |
2927 | return err; |
2928 | ||
2929 | out_brelse: | |
2930 | brelse(iloc.bh); | |
2931 | goto out_err; | |
2932 | } | |
2933 | ||
af5bc92d | 2934 | static int ext4_rmdir(struct inode *dir, struct dentry *dentry) |
ac27a0ec DK |
2935 | { |
2936 | int retval; | |
af5bc92d TT |
2937 | struct inode *inode; |
2938 | struct buffer_head *bh; | |
2939 | struct ext4_dir_entry_2 *de; | |
8dcfaad2 | 2940 | handle_t *handle = NULL; |
ac27a0ec | 2941 | |
0db1ff22 TT |
2942 | if (unlikely(ext4_forced_shutdown(EXT4_SB(dir->i_sb)))) |
2943 | return -EIO; | |
2944 | ||
ac27a0ec DK |
2945 | /* Initialize quotas before so that eventual writes go in |
2946 | * separate transaction */ | |
a7cdadee JK |
2947 | retval = dquot_initialize(dir); |
2948 | if (retval) | |
2949 | return retval; | |
2950 | retval = dquot_initialize(d_inode(dentry)); | |
2951 | if (retval) | |
2952 | return retval; | |
907f4554 | 2953 | |
ac27a0ec | 2954 | retval = -ENOENT; |
32f7f22c | 2955 | bh = ext4_find_entry(dir, &dentry->d_name, &de, NULL); |
36de9286 TT |
2956 | if (IS_ERR(bh)) |
2957 | return PTR_ERR(bh); | |
ac27a0ec DK |
2958 | if (!bh) |
2959 | goto end_rmdir; | |
2960 | ||
2b0143b5 | 2961 | inode = d_inode(dentry); |
ac27a0ec | 2962 | |
6a797d27 | 2963 | retval = -EFSCORRUPTED; |
ac27a0ec DK |
2964 | if (le32_to_cpu(de->inode) != inode->i_ino) |
2965 | goto end_rmdir; | |
2966 | ||
2967 | retval = -ENOTEMPTY; | |
e875a2dd | 2968 | if (!ext4_empty_dir(inode)) |
ac27a0ec DK |
2969 | goto end_rmdir; |
2970 | ||
8dcfaad2 | 2971 | handle = ext4_journal_start(dir, EXT4_HT_DIR, |
64044abf | 2972 | EXT4_DATA_TRANS_BLOCKS(dir->i_sb)); |
8dcfaad2 TT |
2973 | if (IS_ERR(handle)) { |
2974 | retval = PTR_ERR(handle); | |
2975 | handle = NULL; | |
2976 | goto end_rmdir; | |
2977 | } | |
2978 | ||
2979 | if (IS_DIRSYNC(dir)) | |
2980 | ext4_handle_sync(handle); | |
2981 | ||
617ba13b | 2982 | retval = ext4_delete_entry(handle, dir, de, bh); |
ac27a0ec DK |
2983 | if (retval) |
2984 | goto end_rmdir; | |
f8628a14 | 2985 | if (!EXT4_DIR_LINK_EMPTY(inode)) |
b03a2f7e AD |
2986 | ext4_warning_inode(inode, |
2987 | "empty directory '%.*s' has too many links (%u)", | |
2988 | dentry->d_name.len, dentry->d_name.name, | |
af5bc92d | 2989 | inode->i_nlink); |
ac27a0ec DK |
2990 | inode->i_version++; |
2991 | clear_nlink(inode); | |
2992 | /* There's no need to set i_disksize: the fact that i_nlink is | |
2993 | * zero will ensure that the right thing happens during any | |
2994 | * recovery. */ | |
2995 | inode->i_size = 0; | |
617ba13b | 2996 | ext4_orphan_add(handle, inode); |
eeca7ea1 | 2997 | inode->i_ctime = dir->i_ctime = dir->i_mtime = current_time(inode); |
617ba13b | 2998 | ext4_mark_inode_dirty(handle, inode); |
f8628a14 | 2999 | ext4_dec_count(handle, dir); |
617ba13b MC |
3000 | ext4_update_dx_flag(dir); |
3001 | ext4_mark_inode_dirty(handle, dir); | |
ac27a0ec DK |
3002 | |
3003 | end_rmdir: | |
af5bc92d | 3004 | brelse(bh); |
8dcfaad2 TT |
3005 | if (handle) |
3006 | ext4_journal_stop(handle); | |
ac27a0ec DK |
3007 | return retval; |
3008 | } | |
3009 | ||
af5bc92d | 3010 | static int ext4_unlink(struct inode *dir, struct dentry *dentry) |
ac27a0ec DK |
3011 | { |
3012 | int retval; | |
af5bc92d TT |
3013 | struct inode *inode; |
3014 | struct buffer_head *bh; | |
3015 | struct ext4_dir_entry_2 *de; | |
931b6864 | 3016 | handle_t *handle = NULL; |
ac27a0ec | 3017 | |
0db1ff22 TT |
3018 | if (unlikely(ext4_forced_shutdown(EXT4_SB(dir->i_sb)))) |
3019 | return -EIO; | |
3020 | ||
0562e0ba | 3021 | trace_ext4_unlink_enter(dir, dentry); |
ac27a0ec DK |
3022 | /* Initialize quotas before so that eventual writes go |
3023 | * in separate transaction */ | |
a7cdadee JK |
3024 | retval = dquot_initialize(dir); |
3025 | if (retval) | |
3026 | return retval; | |
3027 | retval = dquot_initialize(d_inode(dentry)); | |
3028 | if (retval) | |
3029 | return retval; | |
907f4554 | 3030 | |
ac27a0ec | 3031 | retval = -ENOENT; |
32f7f22c | 3032 | bh = ext4_find_entry(dir, &dentry->d_name, &de, NULL); |
36de9286 TT |
3033 | if (IS_ERR(bh)) |
3034 | return PTR_ERR(bh); | |
ac27a0ec DK |
3035 | if (!bh) |
3036 | goto end_unlink; | |
3037 | ||
2b0143b5 | 3038 | inode = d_inode(dentry); |
ac27a0ec | 3039 | |
6a797d27 | 3040 | retval = -EFSCORRUPTED; |
ac27a0ec DK |
3041 | if (le32_to_cpu(de->inode) != inode->i_ino) |
3042 | goto end_unlink; | |
3043 | ||
931b6864 | 3044 | handle = ext4_journal_start(dir, EXT4_HT_DIR, |
64044abf | 3045 | EXT4_DATA_TRANS_BLOCKS(dir->i_sb)); |
931b6864 TT |
3046 | if (IS_ERR(handle)) { |
3047 | retval = PTR_ERR(handle); | |
3048 | handle = NULL; | |
3049 | goto end_unlink; | |
3050 | } | |
3051 | ||
3052 | if (IS_DIRSYNC(dir)) | |
3053 | ext4_handle_sync(handle); | |
3054 | ||
b03a2f7e AD |
3055 | if (inode->i_nlink == 0) { |
3056 | ext4_warning_inode(inode, "Deleting file '%.*s' with no links", | |
3057 | dentry->d_name.len, dentry->d_name.name); | |
bfe86848 | 3058 | set_nlink(inode, 1); |
ac27a0ec | 3059 | } |
617ba13b | 3060 | retval = ext4_delete_entry(handle, dir, de, bh); |
ac27a0ec DK |
3061 | if (retval) |
3062 | goto end_unlink; | |
eeca7ea1 | 3063 | dir->i_ctime = dir->i_mtime = current_time(dir); |
617ba13b MC |
3064 | ext4_update_dx_flag(dir); |
3065 | ext4_mark_inode_dirty(handle, dir); | |
825f1481 | 3066 | drop_nlink(inode); |
ac27a0ec | 3067 | if (!inode->i_nlink) |
617ba13b | 3068 | ext4_orphan_add(handle, inode); |
eeca7ea1 | 3069 | inode->i_ctime = current_time(inode); |
617ba13b | 3070 | ext4_mark_inode_dirty(handle, inode); |
ac27a0ec DK |
3071 | |
3072 | end_unlink: | |
af5bc92d | 3073 | brelse(bh); |
931b6864 TT |
3074 | if (handle) |
3075 | ext4_journal_stop(handle); | |
0562e0ba | 3076 | trace_ext4_unlink_exit(dentry, retval); |
ac27a0ec DK |
3077 | return retval; |
3078 | } | |
3079 | ||
af5bc92d TT |
3080 | static int ext4_symlink(struct inode *dir, |
3081 | struct dentry *dentry, const char *symname) | |
ac27a0ec DK |
3082 | { |
3083 | handle_t *handle; | |
af5bc92d | 3084 | struct inode *inode; |
f348c252 | 3085 | int err, len = strlen(symname); |
df5e6223 | 3086 | int credits; |
f348c252 | 3087 | bool encryption_required; |
a7550b30 JK |
3088 | struct fscrypt_str disk_link; |
3089 | struct fscrypt_symlink_data *sd = NULL; | |
ac27a0ec | 3090 | |
0db1ff22 TT |
3091 | if (unlikely(ext4_forced_shutdown(EXT4_SB(dir->i_sb)))) |
3092 | return -EIO; | |
3093 | ||
f348c252 TT |
3094 | disk_link.len = len + 1; |
3095 | disk_link.name = (char *) symname; | |
3096 | ||
6ddb2447 TT |
3097 | encryption_required = (ext4_encrypted_inode(dir) || |
3098 | DUMMY_ENCRYPTION_ENABLED(EXT4_SB(dir->i_sb))); | |
4d3c4e5b | 3099 | if (encryption_required) { |
a7550b30 | 3100 | err = fscrypt_get_encryption_info(dir); |
4d3c4e5b TT |
3101 | if (err) |
3102 | return err; | |
a7550b30 | 3103 | if (!fscrypt_has_encryption_key(dir)) |
54475f53 | 3104 | return -ENOKEY; |
a7550b30 JK |
3105 | disk_link.len = (fscrypt_fname_encrypted_size(dir, len) + |
3106 | sizeof(struct fscrypt_symlink_data)); | |
4d3c4e5b TT |
3107 | sd = kzalloc(disk_link.len, GFP_KERNEL); |
3108 | if (!sd) | |
3109 | return -ENOMEM; | |
3110 | } | |
3111 | ||
3112 | if (disk_link.len > dir->i_sb->s_blocksize) { | |
3113 | err = -ENAMETOOLONG; | |
3114 | goto err_free_sd; | |
3115 | } | |
ac27a0ec | 3116 | |
a7cdadee JK |
3117 | err = dquot_initialize(dir); |
3118 | if (err) | |
926631c2 | 3119 | goto err_free_sd; |
907f4554 | 3120 | |
f348c252 | 3121 | if ((disk_link.len > EXT4_N_BLOCKS * 4)) { |
df5e6223 JK |
3122 | /* |
3123 | * For non-fast symlinks, we just allocate inode and put it on | |
3124 | * orphan list in the first transaction => we need bitmap, | |
8c208719 ES |
3125 | * group descriptor, sb, inode block, quota blocks, and |
3126 | * possibly selinux xattr blocks. | |
df5e6223 | 3127 | */ |
8c208719 ES |
3128 | credits = 4 + EXT4_MAXQUOTAS_INIT_BLOCKS(dir->i_sb) + |
3129 | EXT4_XATTR_TRANS_BLOCKS; | |
df5e6223 JK |
3130 | } else { |
3131 | /* | |
3132 | * Fast symlink. We have to add entry to directory | |
3133 | * (EXT4_DATA_TRANS_BLOCKS + EXT4_INDEX_EXTRA_TRANS_BLOCKS), | |
3134 | * allocate new inode (bitmap, group descriptor, inode block, | |
3135 | * quota blocks, sb is already counted in previous macros). | |
3136 | */ | |
3137 | credits = EXT4_DATA_TRANS_BLOCKS(dir->i_sb) + | |
eb9cc7e1 | 3138 | EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3; |
df5e6223 | 3139 | } |
f348c252 | 3140 | |
1139575a TT |
3141 | inode = ext4_new_inode_start_handle(dir, S_IFLNK|S_IRWXUGO, |
3142 | &dentry->d_name, 0, NULL, | |
3143 | EXT4_HT_DIR, credits); | |
3144 | handle = ext4_journal_current_handle(); | |
f348c252 TT |
3145 | if (IS_ERR(inode)) { |
3146 | if (handle) | |
3147 | ext4_journal_stop(handle); | |
4d3c4e5b TT |
3148 | err = PTR_ERR(inode); |
3149 | goto err_free_sd; | |
f348c252 TT |
3150 | } |
3151 | ||
3152 | if (encryption_required) { | |
f348c252 | 3153 | struct qstr istr; |
a7550b30 JK |
3154 | struct fscrypt_str ostr = |
3155 | FSTR_INIT(sd->encrypted_path, disk_link.len); | |
f348c252 | 3156 | |
f348c252 TT |
3157 | istr.name = (const unsigned char *) symname; |
3158 | istr.len = len; | |
a7550b30 | 3159 | err = fscrypt_fname_usr_to_disk(inode, &istr, &ostr); |
ef1eb3aa | 3160 | if (err) |
f348c252 TT |
3161 | goto err_drop_inode; |
3162 | sd->len = cpu_to_le16(ostr.len); | |
3163 | disk_link.name = (char *) sd; | |
a7a67e8a | 3164 | inode->i_op = &ext4_encrypted_symlink_inode_operations; |
f348c252 | 3165 | } |
ac27a0ec | 3166 | |
f348c252 | 3167 | if ((disk_link.len > EXT4_N_BLOCKS * 4)) { |
a7a67e8a AV |
3168 | if (!encryption_required) |
3169 | inode->i_op = &ext4_symlink_inode_operations; | |
21fc61c7 | 3170 | inode_nohighmem(inode); |
617ba13b | 3171 | ext4_set_aops(inode); |
ac27a0ec | 3172 | /* |
df5e6223 JK |
3173 | * We cannot call page_symlink() with transaction started |
3174 | * because it calls into ext4_write_begin() which can wait | |
3175 | * for transaction commit if we are running out of space | |
3176 | * and thus we deadlock. So we have to stop transaction now | |
3177 | * and restart it when symlink contents is written. | |
3178 | * | |
3179 | * To keep fs consistent in case of crash, we have to put inode | |
3180 | * to orphan list in the mean time. | |
ac27a0ec | 3181 | */ |
df5e6223 JK |
3182 | drop_nlink(inode); |
3183 | err = ext4_orphan_add(handle, inode); | |
3184 | ext4_journal_stop(handle); | |
f348c252 | 3185 | handle = NULL; |
df5e6223 JK |
3186 | if (err) |
3187 | goto err_drop_inode; | |
f348c252 | 3188 | err = __page_symlink(inode, disk_link.name, disk_link.len, 1); |
df5e6223 JK |
3189 | if (err) |
3190 | goto err_drop_inode; | |
3191 | /* | |
3192 | * Now inode is being linked into dir (EXT4_DATA_TRANS_BLOCKS | |
3193 | * + EXT4_INDEX_EXTRA_TRANS_BLOCKS), inode is also modified | |
3194 | */ | |
9924a92a | 3195 | handle = ext4_journal_start(dir, EXT4_HT_DIR, |
df5e6223 JK |
3196 | EXT4_DATA_TRANS_BLOCKS(dir->i_sb) + |
3197 | EXT4_INDEX_EXTRA_TRANS_BLOCKS + 1); | |
3198 | if (IS_ERR(handle)) { | |
3199 | err = PTR_ERR(handle); | |
f348c252 | 3200 | handle = NULL; |
df5e6223 JK |
3201 | goto err_drop_inode; |
3202 | } | |
0ce8c010 | 3203 | set_nlink(inode, 1); |
df5e6223 | 3204 | err = ext4_orphan_del(handle, inode); |
f348c252 | 3205 | if (err) |
df5e6223 | 3206 | goto err_drop_inode; |
ac27a0ec | 3207 | } else { |
e65187e6 | 3208 | /* clear the extent format for fast symlink */ |
12e9b892 | 3209 | ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS); |
75e7566b | 3210 | if (!encryption_required) { |
a7a67e8a | 3211 | inode->i_op = &ext4_fast_symlink_inode_operations; |
75e7566b AV |
3212 | inode->i_link = (char *)&EXT4_I(inode)->i_data; |
3213 | } | |
f348c252 TT |
3214 | memcpy((char *)&EXT4_I(inode)->i_data, disk_link.name, |
3215 | disk_link.len); | |
3216 | inode->i_size = disk_link.len - 1; | |
ac27a0ec | 3217 | } |
617ba13b MC |
3218 | EXT4_I(inode)->i_disksize = inode->i_size; |
3219 | err = ext4_add_nondir(handle, dentry, inode); | |
1139575a TT |
3220 | if (!err && IS_DIRSYNC(dir)) |
3221 | ext4_handle_sync(handle); | |
3222 | ||
1139575a TT |
3223 | if (handle) |
3224 | ext4_journal_stop(handle); | |
f348c252 | 3225 | kfree(sd); |
ac27a0ec | 3226 | return err; |
df5e6223 | 3227 | err_drop_inode: |
f348c252 TT |
3228 | if (handle) |
3229 | ext4_journal_stop(handle); | |
f348c252 | 3230 | clear_nlink(inode); |
df5e6223 JK |
3231 | unlock_new_inode(inode); |
3232 | iput(inode); | |
4d3c4e5b TT |
3233 | err_free_sd: |
3234 | kfree(sd); | |
df5e6223 | 3235 | return err; |
ac27a0ec DK |
3236 | } |
3237 | ||
af5bc92d TT |
3238 | static int ext4_link(struct dentry *old_dentry, |
3239 | struct inode *dir, struct dentry *dentry) | |
ac27a0ec DK |
3240 | { |
3241 | handle_t *handle; | |
2b0143b5 | 3242 | struct inode *inode = d_inode(old_dentry); |
ac27a0ec DK |
3243 | int err, retries = 0; |
3244 | ||
b05ab1dc | 3245 | if (inode->i_nlink >= EXT4_LINK_MAX) |
ac27a0ec | 3246 | return -EMLINK; |
d9cdc903 | 3247 | if (ext4_encrypted_inode(dir) && |
a7550b30 | 3248 | !fscrypt_has_permitted_context(dir, inode)) |
d9cdc903 | 3249 | return -EPERM; |
040cb378 LX |
3250 | |
3251 | if ((ext4_test_inode_flag(dir, EXT4_INODE_PROJINHERIT)) && | |
3252 | (!projid_eq(EXT4_I(dir)->i_projid, | |
3253 | EXT4_I(old_dentry->d_inode)->i_projid))) | |
3254 | return -EXDEV; | |
3255 | ||
a7cdadee JK |
3256 | err = dquot_initialize(dir); |
3257 | if (err) | |
3258 | return err; | |
907f4554 | 3259 | |
ac27a0ec | 3260 | retry: |
9924a92a TT |
3261 | handle = ext4_journal_start(dir, EXT4_HT_DIR, |
3262 | (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) + | |
af51a2ac | 3263 | EXT4_INDEX_EXTRA_TRANS_BLOCKS) + 1); |
ac27a0ec DK |
3264 | if (IS_ERR(handle)) |
3265 | return PTR_ERR(handle); | |
3266 | ||
3267 | if (IS_DIRSYNC(dir)) | |
0390131b | 3268 | ext4_handle_sync(handle); |
ac27a0ec | 3269 | |
eeca7ea1 | 3270 | inode->i_ctime = current_time(inode); |
f8628a14 | 3271 | ext4_inc_count(handle, inode); |
7de9c6ee | 3272 | ihold(inode); |
ac27a0ec | 3273 | |
6b38e842 AV |
3274 | err = ext4_add_entry(handle, dentry, inode); |
3275 | if (!err) { | |
3276 | ext4_mark_inode_dirty(handle, inode); | |
af51a2ac AV |
3277 | /* this can happen only for tmpfile being |
3278 | * linked the first time | |
3279 | */ | |
3280 | if (inode->i_nlink == 1) | |
3281 | ext4_orphan_del(handle, inode); | |
6b38e842 AV |
3282 | d_instantiate(dentry, inode); |
3283 | } else { | |
3284 | drop_nlink(inode); | |
3285 | iput(inode); | |
3286 | } | |
617ba13b MC |
3287 | ext4_journal_stop(handle); |
3288 | if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries)) | |
ac27a0ec DK |
3289 | goto retry; |
3290 | return err; | |
3291 | } | |
3292 | ||
32f7f22c TM |
3293 | |
3294 | /* | |
3295 | * Try to find buffer head where contains the parent block. | |
3296 | * It should be the inode block if it is inlined or the 1st block | |
3297 | * if it is a normal dir. | |
3298 | */ | |
3299 | static struct buffer_head *ext4_get_first_dir_block(handle_t *handle, | |
3300 | struct inode *inode, | |
3301 | int *retval, | |
3302 | struct ext4_dir_entry_2 **parent_de, | |
3303 | int *inlined) | |
3304 | { | |
3305 | struct buffer_head *bh; | |
3306 | ||
3307 | if (!ext4_has_inline_data(inode)) { | |
dc6982ff TT |
3308 | bh = ext4_read_dirblock(inode, 0, EITHER); |
3309 | if (IS_ERR(bh)) { | |
3310 | *retval = PTR_ERR(bh); | |
32f7f22c TM |
3311 | return NULL; |
3312 | } | |
3313 | *parent_de = ext4_next_entry( | |
3314 | (struct ext4_dir_entry_2 *)bh->b_data, | |
3315 | inode->i_sb->s_blocksize); | |
3316 | return bh; | |
3317 | } | |
3318 | ||
3319 | *inlined = 1; | |
3320 | return ext4_get_first_inline_block(inode, parent_de, retval); | |
3321 | } | |
ac27a0ec | 3322 | |
c0d268c3 MS |
3323 | struct ext4_renament { |
3324 | struct inode *dir; | |
3325 | struct dentry *dentry; | |
3326 | struct inode *inode; | |
bd42998a MS |
3327 | bool is_dir; |
3328 | int dir_nlink_delta; | |
c0d268c3 MS |
3329 | |
3330 | /* entry for "dentry" */ | |
3331 | struct buffer_head *bh; | |
3332 | struct ext4_dir_entry_2 *de; | |
3333 | int inlined; | |
3334 | ||
3335 | /* entry for ".." in inode if it's a directory */ | |
3336 | struct buffer_head *dir_bh; | |
3337 | struct ext4_dir_entry_2 *parent_de; | |
3338 | int dir_inlined; | |
3339 | }; | |
3340 | ||
bd1af145 MS |
3341 | static int ext4_rename_dir_prepare(handle_t *handle, struct ext4_renament *ent) |
3342 | { | |
3343 | int retval; | |
3344 | ||
3345 | ent->dir_bh = ext4_get_first_dir_block(handle, ent->inode, | |
3346 | &retval, &ent->parent_de, | |
3347 | &ent->dir_inlined); | |
3348 | if (!ent->dir_bh) | |
3349 | return retval; | |
3350 | if (le32_to_cpu(ent->parent_de->inode) != ent->dir->i_ino) | |
6a797d27 | 3351 | return -EFSCORRUPTED; |
bd1af145 MS |
3352 | BUFFER_TRACE(ent->dir_bh, "get_write_access"); |
3353 | return ext4_journal_get_write_access(handle, ent->dir_bh); | |
3354 | } | |
3355 | ||
3356 | static int ext4_rename_dir_finish(handle_t *handle, struct ext4_renament *ent, | |
3357 | unsigned dir_ino) | |
3358 | { | |
3359 | int retval; | |
3360 | ||
3361 | ent->parent_de->inode = cpu_to_le32(dir_ino); | |
3362 | BUFFER_TRACE(ent->dir_bh, "call ext4_handle_dirty_metadata"); | |
3363 | if (!ent->dir_inlined) { | |
3364 | if (is_dx(ent->inode)) { | |
3365 | retval = ext4_handle_dirty_dx_node(handle, | |
3366 | ent->inode, | |
3367 | ent->dir_bh); | |
3368 | } else { | |
3369 | retval = ext4_handle_dirty_dirent_node(handle, | |
3370 | ent->inode, | |
3371 | ent->dir_bh); | |
3372 | } | |
3373 | } else { | |
3374 | retval = ext4_mark_inode_dirty(handle, ent->inode); | |
3375 | } | |
3376 | if (retval) { | |
3377 | ext4_std_error(ent->dir->i_sb, retval); | |
3378 | return retval; | |
3379 | } | |
3380 | return 0; | |
3381 | } | |
3382 | ||
3383 | static int ext4_setent(handle_t *handle, struct ext4_renament *ent, | |
3384 | unsigned ino, unsigned file_type) | |
3385 | { | |
3386 | int retval; | |
3387 | ||
3388 | BUFFER_TRACE(ent->bh, "get write access"); | |
3389 | retval = ext4_journal_get_write_access(handle, ent->bh); | |
3390 | if (retval) | |
3391 | return retval; | |
3392 | ent->de->inode = cpu_to_le32(ino); | |
e2b911c5 | 3393 | if (ext4_has_feature_filetype(ent->dir->i_sb)) |
bd1af145 MS |
3394 | ent->de->file_type = file_type; |
3395 | ent->dir->i_version++; | |
3396 | ent->dir->i_ctime = ent->dir->i_mtime = | |
eeca7ea1 | 3397 | current_time(ent->dir); |
bd1af145 MS |
3398 | ext4_mark_inode_dirty(handle, ent->dir); |
3399 | BUFFER_TRACE(ent->bh, "call ext4_handle_dirty_metadata"); | |
3400 | if (!ent->inlined) { | |
3401 | retval = ext4_handle_dirty_dirent_node(handle, | |
3402 | ent->dir, ent->bh); | |
3403 | if (unlikely(retval)) { | |
3404 | ext4_std_error(ent->dir->i_sb, retval); | |
3405 | return retval; | |
3406 | } | |
3407 | } | |
3408 | brelse(ent->bh); | |
3409 | ent->bh = NULL; | |
3410 | ||
3411 | return 0; | |
3412 | } | |
3413 | ||
3414 | static int ext4_find_delete_entry(handle_t *handle, struct inode *dir, | |
3415 | const struct qstr *d_name) | |
3416 | { | |
3417 | int retval = -ENOENT; | |
3418 | struct buffer_head *bh; | |
3419 | struct ext4_dir_entry_2 *de; | |
3420 | ||
3421 | bh = ext4_find_entry(dir, d_name, &de, NULL); | |
36de9286 TT |
3422 | if (IS_ERR(bh)) |
3423 | return PTR_ERR(bh); | |
bd1af145 MS |
3424 | if (bh) { |
3425 | retval = ext4_delete_entry(handle, dir, de, bh); | |
3426 | brelse(bh); | |
3427 | } | |
3428 | return retval; | |
3429 | } | |
3430 | ||
d80d448c DW |
3431 | static void ext4_rename_delete(handle_t *handle, struct ext4_renament *ent, |
3432 | int force_reread) | |
bd1af145 MS |
3433 | { |
3434 | int retval; | |
3435 | /* | |
3436 | * ent->de could have moved from under us during htree split, so make | |
3437 | * sure that we are deleting the right entry. We might also be pointing | |
3438 | * to a stale entry in the unused part of ent->bh so just checking inum | |
3439 | * and the name isn't enough. | |
3440 | */ | |
3441 | if (le32_to_cpu(ent->de->inode) != ent->inode->i_ino || | |
3442 | ent->de->name_len != ent->dentry->d_name.len || | |
3443 | strncmp(ent->de->name, ent->dentry->d_name.name, | |
d80d448c DW |
3444 | ent->de->name_len) || |
3445 | force_reread) { | |
bd1af145 MS |
3446 | retval = ext4_find_delete_entry(handle, ent->dir, |
3447 | &ent->dentry->d_name); | |
3448 | } else { | |
3449 | retval = ext4_delete_entry(handle, ent->dir, ent->de, ent->bh); | |
3450 | if (retval == -ENOENT) { | |
3451 | retval = ext4_find_delete_entry(handle, ent->dir, | |
3452 | &ent->dentry->d_name); | |
3453 | } | |
3454 | } | |
3455 | ||
3456 | if (retval) { | |
b03a2f7e AD |
3457 | ext4_warning_inode(ent->dir, |
3458 | "Deleting old file: nlink %d, error=%d", | |
3459 | ent->dir->i_nlink, retval); | |
bd1af145 MS |
3460 | } |
3461 | } | |
3462 | ||
bd42998a MS |
3463 | static void ext4_update_dir_count(handle_t *handle, struct ext4_renament *ent) |
3464 | { | |
3465 | if (ent->dir_nlink_delta) { | |
3466 | if (ent->dir_nlink_delta == -1) | |
3467 | ext4_dec_count(handle, ent->dir); | |
3468 | else | |
3469 | ext4_inc_count(handle, ent->dir); | |
3470 | ext4_mark_inode_dirty(handle, ent->dir); | |
3471 | } | |
3472 | } | |
3473 | ||
cd808dec MS |
3474 | static struct inode *ext4_whiteout_for_rename(struct ext4_renament *ent, |
3475 | int credits, handle_t **h) | |
3476 | { | |
3477 | struct inode *wh; | |
3478 | handle_t *handle; | |
3479 | int retries = 0; | |
3480 | ||
3481 | /* | |
3482 | * for inode block, sb block, group summaries, | |
3483 | * and inode bitmap | |
3484 | */ | |
3485 | credits += (EXT4_MAXQUOTAS_TRANS_BLOCKS(ent->dir->i_sb) + | |
3486 | EXT4_XATTR_TRANS_BLOCKS + 4); | |
3487 | retry: | |
3488 | wh = ext4_new_inode_start_handle(ent->dir, S_IFCHR | WHITEOUT_MODE, | |
3489 | &ent->dentry->d_name, 0, NULL, | |
3490 | EXT4_HT_DIR, credits); | |
3491 | ||
3492 | handle = ext4_journal_current_handle(); | |
3493 | if (IS_ERR(wh)) { | |
3494 | if (handle) | |
3495 | ext4_journal_stop(handle); | |
3496 | if (PTR_ERR(wh) == -ENOSPC && | |
3497 | ext4_should_retry_alloc(ent->dir->i_sb, &retries)) | |
3498 | goto retry; | |
3499 | } else { | |
3500 | *h = handle; | |
3501 | init_special_inode(wh, wh->i_mode, WHITEOUT_DEV); | |
3502 | wh->i_op = &ext4_special_inode_operations; | |
3503 | } | |
3504 | return wh; | |
3505 | } | |
3506 | ||
ac27a0ec DK |
3507 | /* |
3508 | * Anybody can rename anything with this: the permission checks are left to the | |
3509 | * higher-level routines. | |
0e202704 TT |
3510 | * |
3511 | * n.b. old_{dentry,inode) refers to the source dentry/inode | |
3512 | * while new_{dentry,inode) refers to the destination dentry/inode | |
3513 | * This comes from rename(const char *oldpath, const char *newpath) | |
ac27a0ec | 3514 | */ |
af5bc92d | 3515 | static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry, |
cd808dec MS |
3516 | struct inode *new_dir, struct dentry *new_dentry, |
3517 | unsigned int flags) | |
ac27a0ec | 3518 | { |
5b61de75 | 3519 | handle_t *handle = NULL; |
c0d268c3 MS |
3520 | struct ext4_renament old = { |
3521 | .dir = old_dir, | |
3522 | .dentry = old_dentry, | |
2b0143b5 | 3523 | .inode = d_inode(old_dentry), |
c0d268c3 MS |
3524 | }; |
3525 | struct ext4_renament new = { | |
3526 | .dir = new_dir, | |
3527 | .dentry = new_dentry, | |
2b0143b5 | 3528 | .inode = d_inode(new_dentry), |
c0d268c3 | 3529 | }; |
d80d448c | 3530 | int force_reread; |
0e202704 | 3531 | int retval; |
cd808dec MS |
3532 | struct inode *whiteout = NULL; |
3533 | int credits; | |
3534 | u8 old_file_type; | |
907f4554 | 3535 | |
040cb378 LX |
3536 | if ((ext4_test_inode_flag(new_dir, EXT4_INODE_PROJINHERIT)) && |
3537 | (!projid_eq(EXT4_I(new_dir)->i_projid, | |
3538 | EXT4_I(old_dentry->d_inode)->i_projid))) | |
3539 | return -EXDEV; | |
3540 | ||
173b8439 TT |
3541 | if ((ext4_encrypted_inode(old_dir) && |
3542 | !fscrypt_has_encryption_key(old_dir)) || | |
3543 | (ext4_encrypted_inode(new_dir) && | |
3544 | !fscrypt_has_encryption_key(new_dir))) | |
3545 | return -ENOKEY; | |
3546 | ||
a7cdadee JK |
3547 | retval = dquot_initialize(old.dir); |
3548 | if (retval) | |
3549 | return retval; | |
3550 | retval = dquot_initialize(new.dir); | |
3551 | if (retval) | |
3552 | return retval; | |
ac27a0ec DK |
3553 | |
3554 | /* Initialize quotas before so that eventual writes go | |
3555 | * in separate transaction */ | |
a7cdadee JK |
3556 | if (new.inode) { |
3557 | retval = dquot_initialize(new.inode); | |
3558 | if (retval) | |
3559 | return retval; | |
3560 | } | |
ac27a0ec | 3561 | |
c0d268c3 | 3562 | old.bh = ext4_find_entry(old.dir, &old.dentry->d_name, &old.de, NULL); |
36de9286 TT |
3563 | if (IS_ERR(old.bh)) |
3564 | return PTR_ERR(old.bh); | |
ac27a0ec DK |
3565 | /* |
3566 | * Check for inode number is _not_ due to possible IO errors. | |
3567 | * We might rmdir the source, keep it as pwd of some process | |
3568 | * and merrily kill the link to whatever was created under the | |
3569 | * same name. Goodbye sticky bit ;-< | |
3570 | */ | |
ac27a0ec | 3571 | retval = -ENOENT; |
c0d268c3 | 3572 | if (!old.bh || le32_to_cpu(old.de->inode) != old.inode->i_ino) |
ac27a0ec DK |
3573 | goto end_rename; |
3574 | ||
d9cdc903 TT |
3575 | if ((old.dir != new.dir) && |
3576 | ext4_encrypted_inode(new.dir) && | |
a7550b30 | 3577 | !fscrypt_has_permitted_context(new.dir, old.inode)) { |
d9cdc903 TT |
3578 | retval = -EPERM; |
3579 | goto end_rename; | |
3580 | } | |
3581 | ||
c0d268c3 MS |
3582 | new.bh = ext4_find_entry(new.dir, &new.dentry->d_name, |
3583 | &new.de, &new.inlined); | |
36de9286 TT |
3584 | if (IS_ERR(new.bh)) { |
3585 | retval = PTR_ERR(new.bh); | |
a9cfcd63 | 3586 | new.bh = NULL; |
36de9286 TT |
3587 | goto end_rename; |
3588 | } | |
c0d268c3 MS |
3589 | if (new.bh) { |
3590 | if (!new.inode) { | |
3591 | brelse(new.bh); | |
3592 | new.bh = NULL; | |
ac27a0ec DK |
3593 | } |
3594 | } | |
c0d268c3 MS |
3595 | if (new.inode && !test_opt(new.dir->i_sb, NO_AUTO_DA_ALLOC)) |
3596 | ext4_alloc_da_blocks(old.inode); | |
5b61de75 | 3597 | |
cd808dec MS |
3598 | credits = (2 * EXT4_DATA_TRANS_BLOCKS(old.dir->i_sb) + |
3599 | EXT4_INDEX_EXTRA_TRANS_BLOCKS + 2); | |
3600 | if (!(flags & RENAME_WHITEOUT)) { | |
3601 | handle = ext4_journal_start(old.dir, EXT4_HT_DIR, credits); | |
7071b715 KK |
3602 | if (IS_ERR(handle)) { |
3603 | retval = PTR_ERR(handle); | |
3604 | handle = NULL; | |
3605 | goto end_rename; | |
3606 | } | |
cd808dec MS |
3607 | } else { |
3608 | whiteout = ext4_whiteout_for_rename(&old, credits, &handle); | |
7071b715 KK |
3609 | if (IS_ERR(whiteout)) { |
3610 | retval = PTR_ERR(whiteout); | |
3611 | whiteout = NULL; | |
3612 | goto end_rename; | |
3613 | } | |
cd808dec | 3614 | } |
5b61de75 | 3615 | |
c0d268c3 | 3616 | if (IS_DIRSYNC(old.dir) || IS_DIRSYNC(new.dir)) |
5b61de75 TT |
3617 | ext4_handle_sync(handle); |
3618 | ||
c0d268c3 MS |
3619 | if (S_ISDIR(old.inode->i_mode)) { |
3620 | if (new.inode) { | |
ac27a0ec | 3621 | retval = -ENOTEMPTY; |
e875a2dd | 3622 | if (!ext4_empty_dir(new.inode)) |
ac27a0ec | 3623 | goto end_rename; |
0d7d5d67 MS |
3624 | } else { |
3625 | retval = -EMLINK; | |
3626 | if (new.dir != old.dir && EXT4_DIR_LINK_MAX(new.dir)) | |
3627 | goto end_rename; | |
ac27a0ec | 3628 | } |
bd1af145 | 3629 | retval = ext4_rename_dir_prepare(handle, &old); |
ef607893 AG |
3630 | if (retval) |
3631 | goto end_rename; | |
ac27a0ec | 3632 | } |
d80d448c DW |
3633 | /* |
3634 | * If we're renaming a file within an inline_data dir and adding or | |
3635 | * setting the new dirent causes a conversion from inline_data to | |
3636 | * extents/blockmap, we need to force the dirent delete code to | |
3637 | * re-read the directory, or else we end up trying to delete a dirent | |
3638 | * from what is now the extent tree root (or a block map). | |
3639 | */ | |
3640 | force_reread = (new.dir->i_ino == old.dir->i_ino && | |
3641 | ext4_test_inode_flag(new.dir, EXT4_INODE_INLINE_DATA)); | |
cd808dec MS |
3642 | |
3643 | old_file_type = old.de->file_type; | |
3644 | if (whiteout) { | |
3645 | /* | |
3646 | * Do this before adding a new entry, so the old entry is sure | |
3647 | * to be still pointing to the valid old entry. | |
3648 | */ | |
3649 | retval = ext4_setent(handle, &old, whiteout->i_ino, | |
3650 | EXT4_FT_CHRDEV); | |
3651 | if (retval) | |
3652 | goto end_rename; | |
3653 | ext4_mark_inode_dirty(handle, whiteout); | |
3654 | } | |
c0d268c3 MS |
3655 | if (!new.bh) { |
3656 | retval = ext4_add_entry(handle, new.dentry, old.inode); | |
ac27a0ec DK |
3657 | if (retval) |
3658 | goto end_rename; | |
3659 | } else { | |
bd1af145 | 3660 | retval = ext4_setent(handle, &new, |
cd808dec | 3661 | old.inode->i_ino, old_file_type); |
ef607893 AG |
3662 | if (retval) |
3663 | goto end_rename; | |
ac27a0ec | 3664 | } |
d80d448c DW |
3665 | if (force_reread) |
3666 | force_reread = !ext4_test_inode_flag(new.dir, | |
3667 | EXT4_INODE_INLINE_DATA); | |
ac27a0ec DK |
3668 | |
3669 | /* | |
3670 | * Like most other Unix systems, set the ctime for inodes on a | |
3671 | * rename. | |
3672 | */ | |
eeca7ea1 | 3673 | old.inode->i_ctime = current_time(old.inode); |
c0d268c3 | 3674 | ext4_mark_inode_dirty(handle, old.inode); |
ac27a0ec | 3675 | |
cd808dec MS |
3676 | if (!whiteout) { |
3677 | /* | |
3678 | * ok, that's it | |
3679 | */ | |
3680 | ext4_rename_delete(handle, &old, force_reread); | |
3681 | } | |
ac27a0ec | 3682 | |
c0d268c3 MS |
3683 | if (new.inode) { |
3684 | ext4_dec_count(handle, new.inode); | |
eeca7ea1 | 3685 | new.inode->i_ctime = current_time(new.inode); |
ac27a0ec | 3686 | } |
eeca7ea1 | 3687 | old.dir->i_ctime = old.dir->i_mtime = current_time(old.dir); |
c0d268c3 MS |
3688 | ext4_update_dx_flag(old.dir); |
3689 | if (old.dir_bh) { | |
bd1af145 MS |
3690 | retval = ext4_rename_dir_finish(handle, &old, new.dir->i_ino); |
3691 | if (retval) | |
b4097142 | 3692 | goto end_rename; |
bd1af145 | 3693 | |
c0d268c3 MS |
3694 | ext4_dec_count(handle, old.dir); |
3695 | if (new.inode) { | |
e875a2dd MH |
3696 | /* checked ext4_empty_dir above, can't have another |
3697 | * parent, ext4_dec_count() won't work for many-linked | |
3698 | * dirs */ | |
c0d268c3 | 3699 | clear_nlink(new.inode); |
ac27a0ec | 3700 | } else { |
c0d268c3 MS |
3701 | ext4_inc_count(handle, new.dir); |
3702 | ext4_update_dx_flag(new.dir); | |
3703 | ext4_mark_inode_dirty(handle, new.dir); | |
ac27a0ec DK |
3704 | } |
3705 | } | |
c0d268c3 MS |
3706 | ext4_mark_inode_dirty(handle, old.dir); |
3707 | if (new.inode) { | |
3708 | ext4_mark_inode_dirty(handle, new.inode); | |
3709 | if (!new.inode->i_nlink) | |
3710 | ext4_orphan_add(handle, new.inode); | |
ac27a0ec DK |
3711 | } |
3712 | retval = 0; | |
3713 | ||
3714 | end_rename: | |
c0d268c3 MS |
3715 | brelse(old.dir_bh); |
3716 | brelse(old.bh); | |
3717 | brelse(new.bh); | |
cd808dec MS |
3718 | if (whiteout) { |
3719 | if (retval) | |
3720 | drop_nlink(whiteout); | |
3721 | unlock_new_inode(whiteout); | |
3722 | iput(whiteout); | |
3723 | } | |
5b61de75 TT |
3724 | if (handle) |
3725 | ext4_journal_stop(handle); | |
ac27a0ec DK |
3726 | return retval; |
3727 | } | |
3728 | ||
bd42998a MS |
3729 | static int ext4_cross_rename(struct inode *old_dir, struct dentry *old_dentry, |
3730 | struct inode *new_dir, struct dentry *new_dentry) | |
3731 | { | |
3732 | handle_t *handle = NULL; | |
3733 | struct ext4_renament old = { | |
3734 | .dir = old_dir, | |
3735 | .dentry = old_dentry, | |
2b0143b5 | 3736 | .inode = d_inode(old_dentry), |
bd42998a MS |
3737 | }; |
3738 | struct ext4_renament new = { | |
3739 | .dir = new_dir, | |
3740 | .dentry = new_dentry, | |
2b0143b5 | 3741 | .inode = d_inode(new_dentry), |
bd42998a MS |
3742 | }; |
3743 | u8 new_file_type; | |
3744 | int retval; | |
eeca7ea1 | 3745 | struct timespec ctime; |
bd42998a | 3746 | |
173b8439 TT |
3747 | if ((ext4_encrypted_inode(old_dir) && |
3748 | !fscrypt_has_encryption_key(old_dir)) || | |
3749 | (ext4_encrypted_inode(new_dir) && | |
3750 | !fscrypt_has_encryption_key(new_dir))) | |
3751 | return -ENOKEY; | |
3752 | ||
c2faccaf TT |
3753 | if ((ext4_encrypted_inode(old_dir) || |
3754 | ext4_encrypted_inode(new_dir)) && | |
3755 | (old_dir != new_dir) && | |
a7550b30 JK |
3756 | (!fscrypt_has_permitted_context(new_dir, old.inode) || |
3757 | !fscrypt_has_permitted_context(old_dir, new.inode))) | |
c2faccaf TT |
3758 | return -EPERM; |
3759 | ||
040cb378 LX |
3760 | if ((ext4_test_inode_flag(new_dir, EXT4_INODE_PROJINHERIT) && |
3761 | !projid_eq(EXT4_I(new_dir)->i_projid, | |
3762 | EXT4_I(old_dentry->d_inode)->i_projid)) || | |
3763 | (ext4_test_inode_flag(old_dir, EXT4_INODE_PROJINHERIT) && | |
3764 | !projid_eq(EXT4_I(old_dir)->i_projid, | |
3765 | EXT4_I(new_dentry->d_inode)->i_projid))) | |
3766 | return -EXDEV; | |
3767 | ||
a7cdadee JK |
3768 | retval = dquot_initialize(old.dir); |
3769 | if (retval) | |
3770 | return retval; | |
3771 | retval = dquot_initialize(new.dir); | |
3772 | if (retval) | |
3773 | return retval; | |
bd42998a MS |
3774 | |
3775 | old.bh = ext4_find_entry(old.dir, &old.dentry->d_name, | |
3776 | &old.de, &old.inlined); | |
36de9286 TT |
3777 | if (IS_ERR(old.bh)) |
3778 | return PTR_ERR(old.bh); | |
bd42998a MS |
3779 | /* |
3780 | * Check for inode number is _not_ due to possible IO errors. | |
3781 | * We might rmdir the source, keep it as pwd of some process | |
3782 | * and merrily kill the link to whatever was created under the | |
3783 | * same name. Goodbye sticky bit ;-< | |
3784 | */ | |
3785 | retval = -ENOENT; | |
3786 | if (!old.bh || le32_to_cpu(old.de->inode) != old.inode->i_ino) | |
3787 | goto end_rename; | |
3788 | ||
3789 | new.bh = ext4_find_entry(new.dir, &new.dentry->d_name, | |
3790 | &new.de, &new.inlined); | |
36de9286 TT |
3791 | if (IS_ERR(new.bh)) { |
3792 | retval = PTR_ERR(new.bh); | |
a9cfcd63 | 3793 | new.bh = NULL; |
36de9286 TT |
3794 | goto end_rename; |
3795 | } | |
bd42998a MS |
3796 | |
3797 | /* RENAME_EXCHANGE case: old *and* new must both exist */ | |
3798 | if (!new.bh || le32_to_cpu(new.de->inode) != new.inode->i_ino) | |
3799 | goto end_rename; | |
3800 | ||
3801 | handle = ext4_journal_start(old.dir, EXT4_HT_DIR, | |
3802 | (2 * EXT4_DATA_TRANS_BLOCKS(old.dir->i_sb) + | |
3803 | 2 * EXT4_INDEX_EXTRA_TRANS_BLOCKS + 2)); | |
7071b715 KK |
3804 | if (IS_ERR(handle)) { |
3805 | retval = PTR_ERR(handle); | |
3806 | handle = NULL; | |
3807 | goto end_rename; | |
3808 | } | |
bd42998a MS |
3809 | |
3810 | if (IS_DIRSYNC(old.dir) || IS_DIRSYNC(new.dir)) | |
3811 | ext4_handle_sync(handle); | |
3812 | ||
3813 | if (S_ISDIR(old.inode->i_mode)) { | |
3814 | old.is_dir = true; | |
3815 | retval = ext4_rename_dir_prepare(handle, &old); | |
3816 | if (retval) | |
3817 | goto end_rename; | |
3818 | } | |
3819 | if (S_ISDIR(new.inode->i_mode)) { | |
3820 | new.is_dir = true; | |
3821 | retval = ext4_rename_dir_prepare(handle, &new); | |
3822 | if (retval) | |
3823 | goto end_rename; | |
3824 | } | |
3825 | ||
3826 | /* | |
3827 | * Other than the special case of overwriting a directory, parents' | |
3828 | * nlink only needs to be modified if this is a cross directory rename. | |
3829 | */ | |
3830 | if (old.dir != new.dir && old.is_dir != new.is_dir) { | |
3831 | old.dir_nlink_delta = old.is_dir ? -1 : 1; | |
3832 | new.dir_nlink_delta = -old.dir_nlink_delta; | |
3833 | retval = -EMLINK; | |
3834 | if ((old.dir_nlink_delta > 0 && EXT4_DIR_LINK_MAX(old.dir)) || | |
3835 | (new.dir_nlink_delta > 0 && EXT4_DIR_LINK_MAX(new.dir))) | |
3836 | goto end_rename; | |
3837 | } | |
3838 | ||
3839 | new_file_type = new.de->file_type; | |
3840 | retval = ext4_setent(handle, &new, old.inode->i_ino, old.de->file_type); | |
3841 | if (retval) | |
3842 | goto end_rename; | |
3843 | ||
3844 | retval = ext4_setent(handle, &old, new.inode->i_ino, new_file_type); | |
3845 | if (retval) | |
3846 | goto end_rename; | |
3847 | ||
3848 | /* | |
3849 | * Like most other Unix systems, set the ctime for inodes on a | |
3850 | * rename. | |
3851 | */ | |
eeca7ea1 DD |
3852 | ctime = current_time(old.inode); |
3853 | old.inode->i_ctime = ctime; | |
3854 | new.inode->i_ctime = ctime; | |
bd42998a MS |
3855 | ext4_mark_inode_dirty(handle, old.inode); |
3856 | ext4_mark_inode_dirty(handle, new.inode); | |
3857 | ||
3858 | if (old.dir_bh) { | |
3859 | retval = ext4_rename_dir_finish(handle, &old, new.dir->i_ino); | |
3860 | if (retval) | |
3861 | goto end_rename; | |
3862 | } | |
3863 | if (new.dir_bh) { | |
3864 | retval = ext4_rename_dir_finish(handle, &new, old.dir->i_ino); | |
3865 | if (retval) | |
3866 | goto end_rename; | |
3867 | } | |
3868 | ext4_update_dir_count(handle, &old); | |
3869 | ext4_update_dir_count(handle, &new); | |
3870 | retval = 0; | |
3871 | ||
3872 | end_rename: | |
3873 | brelse(old.dir_bh); | |
3874 | brelse(new.dir_bh); | |
3875 | brelse(old.bh); | |
3876 | brelse(new.bh); | |
3877 | if (handle) | |
3878 | ext4_journal_stop(handle); | |
3879 | return retval; | |
3880 | } | |
3881 | ||
0a7c3937 MS |
3882 | static int ext4_rename2(struct inode *old_dir, struct dentry *old_dentry, |
3883 | struct inode *new_dir, struct dentry *new_dentry, | |
3884 | unsigned int flags) | |
3885 | { | |
0db1ff22 TT |
3886 | if (unlikely(ext4_forced_shutdown(EXT4_SB(old_dir->i_sb)))) |
3887 | return -EIO; | |
3888 | ||
cd808dec | 3889 | if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT)) |
0a7c3937 MS |
3890 | return -EINVAL; |
3891 | ||
bd42998a MS |
3892 | if (flags & RENAME_EXCHANGE) { |
3893 | return ext4_cross_rename(old_dir, old_dentry, | |
3894 | new_dir, new_dentry); | |
3895 | } | |
cd808dec MS |
3896 | |
3897 | return ext4_rename(old_dir, old_dentry, new_dir, new_dentry, flags); | |
0a7c3937 MS |
3898 | } |
3899 | ||
ac27a0ec DK |
3900 | /* |
3901 | * directories can handle most operations... | |
3902 | */ | |
754661f1 | 3903 | const struct inode_operations ext4_dir_inode_operations = { |
617ba13b MC |
3904 | .create = ext4_create, |
3905 | .lookup = ext4_lookup, | |
3906 | .link = ext4_link, | |
3907 | .unlink = ext4_unlink, | |
3908 | .symlink = ext4_symlink, | |
3909 | .mkdir = ext4_mkdir, | |
3910 | .rmdir = ext4_rmdir, | |
3911 | .mknod = ext4_mknod, | |
af51a2ac | 3912 | .tmpfile = ext4_tmpfile, |
2773bf00 | 3913 | .rename = ext4_rename2, |
617ba13b | 3914 | .setattr = ext4_setattr, |
99652ea5 | 3915 | .getattr = ext4_getattr, |
617ba13b | 3916 | .listxattr = ext4_listxattr, |
4e34e719 | 3917 | .get_acl = ext4_get_acl, |
64e178a7 | 3918 | .set_acl = ext4_set_acl, |
abc8746e | 3919 | .fiemap = ext4_fiemap, |
ac27a0ec DK |
3920 | }; |
3921 | ||
754661f1 | 3922 | const struct inode_operations ext4_special_inode_operations = { |
617ba13b | 3923 | .setattr = ext4_setattr, |
99652ea5 | 3924 | .getattr = ext4_getattr, |
617ba13b | 3925 | .listxattr = ext4_listxattr, |
4e34e719 | 3926 | .get_acl = ext4_get_acl, |
64e178a7 | 3927 | .set_acl = ext4_set_acl, |
ac27a0ec | 3928 | }; |