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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
ac27a0ec | 2 | /* |
617ba13b | 3 | * linux/fs/ext4/namei.c |
ac27a0ec DK |
4 | * |
5 | * Copyright (C) 1992, 1993, 1994, 1995 | |
6 | * Remy Card (card@masi.ibp.fr) | |
7 | * Laboratoire MASI - Institut Blaise Pascal | |
8 | * Universite Pierre et Marie Curie (Paris VI) | |
9 | * | |
10 | * from | |
11 | * | |
12 | * linux/fs/minix/namei.c | |
13 | * | |
14 | * Copyright (C) 1991, 1992 Linus Torvalds | |
15 | * | |
16 | * Big-endian to little-endian byte-swapping/bitmaps by | |
17 | * David S. Miller (davem@caip.rutgers.edu), 1995 | |
18 | * Directory entry file type support and forward compatibility hooks | |
19 | * for B-tree directories by Theodore Ts'o (tytso@mit.edu), 1998 | |
20 | * Hash Tree Directory indexing (c) | |
21 | * Daniel Phillips, 2001 | |
22 | * Hash Tree Directory indexing porting | |
23 | * Christopher Li, 2002 | |
24 | * Hash Tree Directory indexing cleanup | |
25 | * Theodore Ts'o, 2002 | |
26 | */ | |
27 | ||
28 | #include <linux/fs.h> | |
29 | #include <linux/pagemap.h> | |
ac27a0ec | 30 | #include <linux/time.h> |
ac27a0ec DK |
31 | #include <linux/fcntl.h> |
32 | #include <linux/stat.h> | |
33 | #include <linux/string.h> | |
34 | #include <linux/quotaops.h> | |
35 | #include <linux/buffer_head.h> | |
36 | #include <linux/bio.h> | |
3dcf5451 CH |
37 | #include "ext4.h" |
38 | #include "ext4_jbd2.h" | |
ac27a0ec | 39 | |
ac27a0ec DK |
40 | #include "xattr.h" |
41 | #include "acl.h" | |
42 | ||
0562e0ba | 43 | #include <trace/events/ext4.h> |
ac27a0ec DK |
44 | /* |
45 | * define how far ahead to read directories while searching them. | |
46 | */ | |
47 | #define NAMEI_RA_CHUNKS 2 | |
48 | #define NAMEI_RA_BLOCKS 4 | |
8c55e204 | 49 | #define NAMEI_RA_SIZE (NAMEI_RA_CHUNKS * NAMEI_RA_BLOCKS) |
ac27a0ec | 50 | |
617ba13b | 51 | static struct buffer_head *ext4_append(handle_t *handle, |
ac27a0ec | 52 | struct inode *inode, |
0f70b406 | 53 | ext4_lblk_t *block) |
ac27a0ec DK |
54 | { |
55 | struct buffer_head *bh; | |
1c215028 | 56 | int err; |
ac27a0ec | 57 | |
df981d03 TT |
58 | if (unlikely(EXT4_SB(inode->i_sb)->s_max_dir_size_kb && |
59 | ((inode->i_size >> 10) >= | |
0f70b406 TT |
60 | EXT4_SB(inode->i_sb)->s_max_dir_size_kb))) |
61 | return ERR_PTR(-ENOSPC); | |
df981d03 | 62 | |
ac27a0ec DK |
63 | *block = inode->i_size >> inode->i_sb->s_blocksize_bits; |
64 | ||
c5e298ae | 65 | bh = ext4_bread(handle, inode, *block, EXT4_GET_BLOCKS_CREATE); |
1c215028 TT |
66 | if (IS_ERR(bh)) |
67 | return bh; | |
0f70b406 TT |
68 | inode->i_size += inode->i_sb->s_blocksize; |
69 | EXT4_I(inode)->i_disksize = inode->i_size; | |
5d601255 | 70 | BUFFER_TRACE(bh, "get_write_access"); |
0f70b406 TT |
71 | err = ext4_journal_get_write_access(handle, bh); |
72 | if (err) { | |
73 | brelse(bh); | |
74 | ext4_std_error(inode->i_sb, err); | |
75 | return ERR_PTR(err); | |
6d1ab10e | 76 | } |
ac27a0ec DK |
77 | return bh; |
78 | } | |
79 | ||
dc6982ff TT |
80 | static int ext4_dx_csum_verify(struct inode *inode, |
81 | struct ext4_dir_entry *dirent); | |
82 | ||
83 | typedef enum { | |
84 | EITHER, INDEX, DIRENT | |
85 | } dirblock_type_t; | |
86 | ||
87 | #define ext4_read_dirblock(inode, block, type) \ | |
b03a2f7e | 88 | __ext4_read_dirblock((inode), (block), (type), __func__, __LINE__) |
dc6982ff TT |
89 | |
90 | static struct buffer_head *__ext4_read_dirblock(struct inode *inode, | |
b03a2f7e AD |
91 | ext4_lblk_t block, |
92 | dirblock_type_t type, | |
93 | const char *func, | |
94 | unsigned int line) | |
dc6982ff TT |
95 | { |
96 | struct buffer_head *bh; | |
97 | struct ext4_dir_entry *dirent; | |
1c215028 | 98 | int is_dx_block = 0; |
dc6982ff | 99 | |
1c215028 TT |
100 | bh = ext4_bread(NULL, inode, block, 0); |
101 | if (IS_ERR(bh)) { | |
b03a2f7e AD |
102 | __ext4_warning(inode->i_sb, func, line, |
103 | "inode #%lu: lblock %lu: comm %s: " | |
104 | "error %ld reading directory block", | |
105 | inode->i_ino, (unsigned long)block, | |
106 | current->comm, PTR_ERR(bh)); | |
1c215028 TT |
107 | |
108 | return bh; | |
109 | } | |
110 | if (!bh) { | |
b03a2f7e AD |
111 | ext4_error_inode(inode, func, line, block, |
112 | "Directory hole found"); | |
6a797d27 | 113 | return ERR_PTR(-EFSCORRUPTED); |
dc6982ff TT |
114 | } |
115 | dirent = (struct ext4_dir_entry *) bh->b_data; | |
116 | /* Determine whether or not we have an index block */ | |
117 | if (is_dx(inode)) { | |
118 | if (block == 0) | |
119 | is_dx_block = 1; | |
120 | else if (ext4_rec_len_from_disk(dirent->rec_len, | |
121 | inode->i_sb->s_blocksize) == | |
122 | inode->i_sb->s_blocksize) | |
123 | is_dx_block = 1; | |
124 | } | |
125 | if (!is_dx_block && type == INDEX) { | |
b03a2f7e | 126 | ext4_error_inode(inode, func, line, block, |
dc6982ff | 127 | "directory leaf block found instead of index block"); |
6a797d27 | 128 | return ERR_PTR(-EFSCORRUPTED); |
dc6982ff | 129 | } |
9aa5d32b | 130 | if (!ext4_has_metadata_csum(inode->i_sb) || |
dc6982ff TT |
131 | buffer_verified(bh)) |
132 | return bh; | |
133 | ||
134 | /* | |
135 | * An empty leaf block can get mistaken for a index block; for | |
136 | * this reason, we can only check the index checksum when the | |
137 | * caller is sure it should be an index block. | |
138 | */ | |
139 | if (is_dx_block && type == INDEX) { | |
140 | if (ext4_dx_csum_verify(inode, dirent)) | |
141 | set_buffer_verified(bh); | |
142 | else { | |
b03a2f7e AD |
143 | ext4_error_inode(inode, func, line, block, |
144 | "Directory index failed checksum"); | |
a871611b | 145 | brelse(bh); |
6a797d27 | 146 | return ERR_PTR(-EFSBADCRC); |
a871611b | 147 | } |
ac27a0ec | 148 | } |
dc6982ff TT |
149 | if (!is_dx_block) { |
150 | if (ext4_dirent_csum_verify(inode, dirent)) | |
151 | set_buffer_verified(bh); | |
152 | else { | |
b03a2f7e AD |
153 | ext4_error_inode(inode, func, line, block, |
154 | "Directory block failed checksum"); | |
dc6982ff | 155 | brelse(bh); |
6a797d27 | 156 | return ERR_PTR(-EFSBADCRC); |
dc6982ff | 157 | } |
6d1ab10e | 158 | } |
ac27a0ec DK |
159 | return bh; |
160 | } | |
161 | ||
162 | #ifndef assert | |
163 | #define assert(test) J_ASSERT(test) | |
164 | #endif | |
165 | ||
ac27a0ec DK |
166 | #ifdef DX_DEBUG |
167 | #define dxtrace(command) command | |
168 | #else | |
169 | #define dxtrace(command) | |
170 | #endif | |
171 | ||
172 | struct fake_dirent | |
173 | { | |
174 | __le32 inode; | |
175 | __le16 rec_len; | |
176 | u8 name_len; | |
177 | u8 file_type; | |
178 | }; | |
179 | ||
180 | struct dx_countlimit | |
181 | { | |
182 | __le16 limit; | |
183 | __le16 count; | |
184 | }; | |
185 | ||
186 | struct dx_entry | |
187 | { | |
188 | __le32 hash; | |
189 | __le32 block; | |
190 | }; | |
191 | ||
192 | /* | |
193 | * dx_root_info is laid out so that if it should somehow get overlaid by a | |
194 | * dirent the two low bits of the hash version will be zero. Therefore, the | |
195 | * hash version mod 4 should never be 0. Sincerely, the paranoia department. | |
196 | */ | |
197 | ||
198 | struct dx_root | |
199 | { | |
200 | struct fake_dirent dot; | |
201 | char dot_name[4]; | |
202 | struct fake_dirent dotdot; | |
203 | char dotdot_name[4]; | |
204 | struct dx_root_info | |
205 | { | |
206 | __le32 reserved_zero; | |
207 | u8 hash_version; | |
208 | u8 info_length; /* 8 */ | |
209 | u8 indirect_levels; | |
210 | u8 unused_flags; | |
211 | } | |
212 | info; | |
213 | struct dx_entry entries[0]; | |
214 | }; | |
215 | ||
216 | struct dx_node | |
217 | { | |
218 | struct fake_dirent fake; | |
219 | struct dx_entry entries[0]; | |
220 | }; | |
221 | ||
222 | ||
223 | struct dx_frame | |
224 | { | |
225 | struct buffer_head *bh; | |
226 | struct dx_entry *entries; | |
227 | struct dx_entry *at; | |
228 | }; | |
229 | ||
230 | struct dx_map_entry | |
231 | { | |
232 | u32 hash; | |
ef2b02d3 ES |
233 | u16 offs; |
234 | u16 size; | |
ac27a0ec DK |
235 | }; |
236 | ||
e6153918 DW |
237 | /* |
238 | * This goes at the end of each htree block. | |
239 | */ | |
240 | struct dx_tail { | |
241 | u32 dt_reserved; | |
242 | __le32 dt_checksum; /* crc32c(uuid+inum+dirblock) */ | |
243 | }; | |
244 | ||
725d26d3 AK |
245 | static inline ext4_lblk_t dx_get_block(struct dx_entry *entry); |
246 | static void dx_set_block(struct dx_entry *entry, ext4_lblk_t value); | |
af5bc92d TT |
247 | static inline unsigned dx_get_hash(struct dx_entry *entry); |
248 | static void dx_set_hash(struct dx_entry *entry, unsigned value); | |
249 | static unsigned dx_get_count(struct dx_entry *entries); | |
250 | static unsigned dx_get_limit(struct dx_entry *entries); | |
251 | static void dx_set_count(struct dx_entry *entries, unsigned value); | |
252 | static void dx_set_limit(struct dx_entry *entries, unsigned value); | |
253 | static unsigned dx_root_limit(struct inode *dir, unsigned infosize); | |
254 | static unsigned dx_node_limit(struct inode *dir); | |
5b643f9c | 255 | static struct dx_frame *dx_probe(struct ext4_filename *fname, |
ac27a0ec DK |
256 | struct inode *dir, |
257 | struct dx_hash_info *hinfo, | |
dd73b5d5 | 258 | struct dx_frame *frame); |
af5bc92d | 259 | static void dx_release(struct dx_frame *frames); |
1f3862b5 MH |
260 | static int dx_make_map(struct inode *dir, struct ext4_dir_entry_2 *de, |
261 | unsigned blocksize, struct dx_hash_info *hinfo, | |
262 | struct dx_map_entry map[]); | |
ac27a0ec | 263 | static void dx_sort_map(struct dx_map_entry *map, unsigned count); |
af5bc92d | 264 | static struct ext4_dir_entry_2 *dx_move_dirents(char *from, char *to, |
3d0518f4 | 265 | struct dx_map_entry *offsets, int count, unsigned blocksize); |
8bad4597 | 266 | static struct ext4_dir_entry_2* dx_pack_dirents(char *base, unsigned blocksize); |
725d26d3 AK |
267 | static void dx_insert_block(struct dx_frame *frame, |
268 | u32 hash, ext4_lblk_t block); | |
617ba13b | 269 | static int ext4_htree_next_block(struct inode *dir, __u32 hash, |
ac27a0ec DK |
270 | struct dx_frame *frame, |
271 | struct dx_frame *frames, | |
272 | __u32 *start_hash); | |
f702ba0f | 273 | static struct buffer_head * ext4_dx_find_entry(struct inode *dir, |
5b643f9c | 274 | struct ext4_filename *fname, |
537d8f93 | 275 | struct ext4_dir_entry_2 **res_dir); |
5b643f9c | 276 | static int ext4_dx_add_entry(handle_t *handle, struct ext4_filename *fname, |
56a04915 | 277 | struct inode *dir, struct inode *inode); |
ac27a0ec | 278 | |
dbe89444 | 279 | /* checksumming functions */ |
3c47d541 TM |
280 | void initialize_dirent_tail(struct ext4_dir_entry_tail *t, |
281 | unsigned int blocksize) | |
b0336e8d DW |
282 | { |
283 | memset(t, 0, sizeof(struct ext4_dir_entry_tail)); | |
284 | t->det_rec_len = ext4_rec_len_to_disk( | |
285 | sizeof(struct ext4_dir_entry_tail), blocksize); | |
286 | t->det_reserved_ft = EXT4_FT_DIR_CSUM; | |
287 | } | |
288 | ||
289 | /* Walk through a dirent block to find a checksum "dirent" at the tail */ | |
290 | static struct ext4_dir_entry_tail *get_dirent_tail(struct inode *inode, | |
291 | struct ext4_dir_entry *de) | |
292 | { | |
293 | struct ext4_dir_entry_tail *t; | |
294 | ||
295 | #ifdef PARANOID | |
296 | struct ext4_dir_entry *d, *top; | |
297 | ||
298 | d = de; | |
299 | top = (struct ext4_dir_entry *)(((void *)de) + | |
300 | (EXT4_BLOCK_SIZE(inode->i_sb) - | |
301 | sizeof(struct ext4_dir_entry_tail))); | |
302 | while (d < top && d->rec_len) | |
303 | d = (struct ext4_dir_entry *)(((void *)d) + | |
304 | le16_to_cpu(d->rec_len)); | |
305 | ||
306 | if (d != top) | |
307 | return NULL; | |
308 | ||
309 | t = (struct ext4_dir_entry_tail *)d; | |
310 | #else | |
311 | t = EXT4_DIRENT_TAIL(de, EXT4_BLOCK_SIZE(inode->i_sb)); | |
312 | #endif | |
313 | ||
314 | if (t->det_reserved_zero1 || | |
315 | le16_to_cpu(t->det_rec_len) != sizeof(struct ext4_dir_entry_tail) || | |
316 | t->det_reserved_zero2 || | |
317 | t->det_reserved_ft != EXT4_FT_DIR_CSUM) | |
318 | return NULL; | |
319 | ||
320 | return t; | |
321 | } | |
322 | ||
323 | static __le32 ext4_dirent_csum(struct inode *inode, | |
324 | struct ext4_dir_entry *dirent, int size) | |
325 | { | |
326 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
327 | struct ext4_inode_info *ei = EXT4_I(inode); | |
328 | __u32 csum; | |
329 | ||
330 | csum = ext4_chksum(sbi, ei->i_csum_seed, (__u8 *)dirent, size); | |
331 | return cpu_to_le32(csum); | |
332 | } | |
333 | ||
b03a2f7e AD |
334 | #define warn_no_space_for_csum(inode) \ |
335 | __warn_no_space_for_csum((inode), __func__, __LINE__) | |
336 | ||
337 | static void __warn_no_space_for_csum(struct inode *inode, const char *func, | |
338 | unsigned int line) | |
dffe9d8d | 339 | { |
b03a2f7e AD |
340 | __ext4_warning_inode(inode, func, line, |
341 | "No space for directory leaf checksum. Please run e2fsck -D."); | |
dffe9d8d TT |
342 | } |
343 | ||
b0336e8d DW |
344 | int ext4_dirent_csum_verify(struct inode *inode, struct ext4_dir_entry *dirent) |
345 | { | |
346 | struct ext4_dir_entry_tail *t; | |
347 | ||
9aa5d32b | 348 | if (!ext4_has_metadata_csum(inode->i_sb)) |
b0336e8d DW |
349 | return 1; |
350 | ||
351 | t = get_dirent_tail(inode, dirent); | |
352 | if (!t) { | |
dffe9d8d | 353 | warn_no_space_for_csum(inode); |
b0336e8d DW |
354 | return 0; |
355 | } | |
356 | ||
357 | if (t->det_checksum != ext4_dirent_csum(inode, dirent, | |
358 | (void *)t - (void *)dirent)) | |
359 | return 0; | |
360 | ||
361 | return 1; | |
362 | } | |
363 | ||
364 | static void ext4_dirent_csum_set(struct inode *inode, | |
365 | struct ext4_dir_entry *dirent) | |
366 | { | |
367 | struct ext4_dir_entry_tail *t; | |
368 | ||
9aa5d32b | 369 | if (!ext4_has_metadata_csum(inode->i_sb)) |
b0336e8d DW |
370 | return; |
371 | ||
372 | t = get_dirent_tail(inode, dirent); | |
373 | if (!t) { | |
dffe9d8d | 374 | warn_no_space_for_csum(inode); |
b0336e8d DW |
375 | return; |
376 | } | |
377 | ||
378 | t->det_checksum = ext4_dirent_csum(inode, dirent, | |
379 | (void *)t - (void *)dirent); | |
380 | } | |
381 | ||
3c47d541 TM |
382 | int ext4_handle_dirty_dirent_node(handle_t *handle, |
383 | struct inode *inode, | |
384 | struct buffer_head *bh) | |
b0336e8d DW |
385 | { |
386 | ext4_dirent_csum_set(inode, (struct ext4_dir_entry *)bh->b_data); | |
387 | return ext4_handle_dirty_metadata(handle, inode, bh); | |
388 | } | |
389 | ||
dbe89444 DW |
390 | static struct dx_countlimit *get_dx_countlimit(struct inode *inode, |
391 | struct ext4_dir_entry *dirent, | |
392 | int *offset) | |
393 | { | |
394 | struct ext4_dir_entry *dp; | |
395 | struct dx_root_info *root; | |
396 | int count_offset; | |
397 | ||
398 | if (le16_to_cpu(dirent->rec_len) == EXT4_BLOCK_SIZE(inode->i_sb)) | |
399 | count_offset = 8; | |
400 | else if (le16_to_cpu(dirent->rec_len) == 12) { | |
401 | dp = (struct ext4_dir_entry *)(((void *)dirent) + 12); | |
402 | if (le16_to_cpu(dp->rec_len) != | |
403 | EXT4_BLOCK_SIZE(inode->i_sb) - 12) | |
404 | return NULL; | |
405 | root = (struct dx_root_info *)(((void *)dp + 12)); | |
406 | if (root->reserved_zero || | |
407 | root->info_length != sizeof(struct dx_root_info)) | |
408 | return NULL; | |
409 | count_offset = 32; | |
410 | } else | |
411 | return NULL; | |
412 | ||
413 | if (offset) | |
414 | *offset = count_offset; | |
415 | return (struct dx_countlimit *)(((void *)dirent) + count_offset); | |
416 | } | |
417 | ||
418 | static __le32 ext4_dx_csum(struct inode *inode, struct ext4_dir_entry *dirent, | |
419 | int count_offset, int count, struct dx_tail *t) | |
420 | { | |
421 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
422 | struct ext4_inode_info *ei = EXT4_I(inode); | |
d6a77105 | 423 | __u32 csum; |
dbe89444 | 424 | int size; |
b47820ed DJ |
425 | __u32 dummy_csum = 0; |
426 | int offset = offsetof(struct dx_tail, dt_checksum); | |
dbe89444 DW |
427 | |
428 | size = count_offset + (count * sizeof(struct dx_entry)); | |
dbe89444 | 429 | csum = ext4_chksum(sbi, ei->i_csum_seed, (__u8 *)dirent, size); |
b47820ed DJ |
430 | csum = ext4_chksum(sbi, csum, (__u8 *)t, offset); |
431 | csum = ext4_chksum(sbi, csum, (__u8 *)&dummy_csum, sizeof(dummy_csum)); | |
dbe89444 DW |
432 | |
433 | return cpu_to_le32(csum); | |
434 | } | |
435 | ||
436 | static int ext4_dx_csum_verify(struct inode *inode, | |
437 | struct ext4_dir_entry *dirent) | |
438 | { | |
439 | struct dx_countlimit *c; | |
440 | struct dx_tail *t; | |
441 | int count_offset, limit, count; | |
442 | ||
9aa5d32b | 443 | if (!ext4_has_metadata_csum(inode->i_sb)) |
dbe89444 DW |
444 | return 1; |
445 | ||
446 | c = get_dx_countlimit(inode, dirent, &count_offset); | |
447 | if (!c) { | |
448 | EXT4_ERROR_INODE(inode, "dir seems corrupt? Run e2fsck -D."); | |
fa964540 | 449 | return 0; |
dbe89444 DW |
450 | } |
451 | limit = le16_to_cpu(c->limit); | |
452 | count = le16_to_cpu(c->count); | |
453 | if (count_offset + (limit * sizeof(struct dx_entry)) > | |
454 | EXT4_BLOCK_SIZE(inode->i_sb) - sizeof(struct dx_tail)) { | |
dffe9d8d | 455 | warn_no_space_for_csum(inode); |
fa964540 | 456 | return 0; |
dbe89444 DW |
457 | } |
458 | t = (struct dx_tail *)(((struct dx_entry *)c) + limit); | |
459 | ||
460 | if (t->dt_checksum != ext4_dx_csum(inode, dirent, count_offset, | |
461 | count, t)) | |
462 | return 0; | |
463 | return 1; | |
464 | } | |
465 | ||
466 | static void ext4_dx_csum_set(struct inode *inode, struct ext4_dir_entry *dirent) | |
467 | { | |
468 | struct dx_countlimit *c; | |
469 | struct dx_tail *t; | |
470 | int count_offset, limit, count; | |
471 | ||
9aa5d32b | 472 | if (!ext4_has_metadata_csum(inode->i_sb)) |
dbe89444 DW |
473 | return; |
474 | ||
475 | c = get_dx_countlimit(inode, dirent, &count_offset); | |
476 | if (!c) { | |
477 | EXT4_ERROR_INODE(inode, "dir seems corrupt? Run e2fsck -D."); | |
478 | return; | |
479 | } | |
480 | limit = le16_to_cpu(c->limit); | |
481 | count = le16_to_cpu(c->count); | |
482 | if (count_offset + (limit * sizeof(struct dx_entry)) > | |
483 | EXT4_BLOCK_SIZE(inode->i_sb) - sizeof(struct dx_tail)) { | |
dffe9d8d | 484 | warn_no_space_for_csum(inode); |
dbe89444 DW |
485 | return; |
486 | } | |
487 | t = (struct dx_tail *)(((struct dx_entry *)c) + limit); | |
488 | ||
489 | t->dt_checksum = ext4_dx_csum(inode, dirent, count_offset, count, t); | |
490 | } | |
491 | ||
492 | static inline int ext4_handle_dirty_dx_node(handle_t *handle, | |
493 | struct inode *inode, | |
494 | struct buffer_head *bh) | |
495 | { | |
496 | ext4_dx_csum_set(inode, (struct ext4_dir_entry *)bh->b_data); | |
497 | return ext4_handle_dirty_metadata(handle, inode, bh); | |
498 | } | |
499 | ||
f795e140 LZ |
500 | /* |
501 | * p is at least 6 bytes before the end of page | |
502 | */ | |
503 | static inline struct ext4_dir_entry_2 * | |
3d0518f4 | 504 | ext4_next_entry(struct ext4_dir_entry_2 *p, unsigned long blocksize) |
f795e140 LZ |
505 | { |
506 | return (struct ext4_dir_entry_2 *)((char *)p + | |
3d0518f4 | 507 | ext4_rec_len_from_disk(p->rec_len, blocksize)); |
f795e140 LZ |
508 | } |
509 | ||
ac27a0ec DK |
510 | /* |
511 | * Future: use high four bits of block for coalesce-on-delete flags | |
512 | * Mask them off for now. | |
513 | */ | |
514 | ||
725d26d3 | 515 | static inline ext4_lblk_t dx_get_block(struct dx_entry *entry) |
ac27a0ec | 516 | { |
e08ac99f | 517 | return le32_to_cpu(entry->block) & 0x0fffffff; |
ac27a0ec DK |
518 | } |
519 | ||
725d26d3 | 520 | static inline void dx_set_block(struct dx_entry *entry, ext4_lblk_t value) |
ac27a0ec DK |
521 | { |
522 | entry->block = cpu_to_le32(value); | |
523 | } | |
524 | ||
af5bc92d | 525 | static inline unsigned dx_get_hash(struct dx_entry *entry) |
ac27a0ec DK |
526 | { |
527 | return le32_to_cpu(entry->hash); | |
528 | } | |
529 | ||
af5bc92d | 530 | static inline void dx_set_hash(struct dx_entry *entry, unsigned value) |
ac27a0ec DK |
531 | { |
532 | entry->hash = cpu_to_le32(value); | |
533 | } | |
534 | ||
af5bc92d | 535 | static inline unsigned dx_get_count(struct dx_entry *entries) |
ac27a0ec DK |
536 | { |
537 | return le16_to_cpu(((struct dx_countlimit *) entries)->count); | |
538 | } | |
539 | ||
af5bc92d | 540 | static inline unsigned dx_get_limit(struct dx_entry *entries) |
ac27a0ec DK |
541 | { |
542 | return le16_to_cpu(((struct dx_countlimit *) entries)->limit); | |
543 | } | |
544 | ||
af5bc92d | 545 | static inline void dx_set_count(struct dx_entry *entries, unsigned value) |
ac27a0ec DK |
546 | { |
547 | ((struct dx_countlimit *) entries)->count = cpu_to_le16(value); | |
548 | } | |
549 | ||
af5bc92d | 550 | static inline void dx_set_limit(struct dx_entry *entries, unsigned value) |
ac27a0ec DK |
551 | { |
552 | ((struct dx_countlimit *) entries)->limit = cpu_to_le16(value); | |
553 | } | |
554 | ||
af5bc92d | 555 | static inline unsigned dx_root_limit(struct inode *dir, unsigned infosize) |
ac27a0ec | 556 | { |
617ba13b MC |
557 | unsigned entry_space = dir->i_sb->s_blocksize - EXT4_DIR_REC_LEN(1) - |
558 | EXT4_DIR_REC_LEN(2) - infosize; | |
dbe89444 | 559 | |
9aa5d32b | 560 | if (ext4_has_metadata_csum(dir->i_sb)) |
dbe89444 | 561 | entry_space -= sizeof(struct dx_tail); |
d9c769b7 | 562 | return entry_space / sizeof(struct dx_entry); |
ac27a0ec DK |
563 | } |
564 | ||
af5bc92d | 565 | static inline unsigned dx_node_limit(struct inode *dir) |
ac27a0ec | 566 | { |
617ba13b | 567 | unsigned entry_space = dir->i_sb->s_blocksize - EXT4_DIR_REC_LEN(0); |
dbe89444 | 568 | |
9aa5d32b | 569 | if (ext4_has_metadata_csum(dir->i_sb)) |
dbe89444 | 570 | entry_space -= sizeof(struct dx_tail); |
d9c769b7 | 571 | return entry_space / sizeof(struct dx_entry); |
ac27a0ec DK |
572 | } |
573 | ||
574 | /* | |
575 | * Debug | |
576 | */ | |
577 | #ifdef DX_DEBUG | |
4776004f | 578 | static void dx_show_index(char * label, struct dx_entry *entries) |
ac27a0ec | 579 | { |
63f57933 | 580 | int i, n = dx_get_count (entries); |
d74f3d25 | 581 | printk(KERN_DEBUG "%s index", label); |
63f57933 | 582 | for (i = 0; i < n; i++) { |
d74f3d25 JP |
583 | printk(KERN_CONT " %x->%lu", |
584 | i ? dx_get_hash(entries + i) : 0, | |
585 | (unsigned long)dx_get_block(entries + i)); | |
63f57933 | 586 | } |
d74f3d25 | 587 | printk(KERN_CONT "\n"); |
ac27a0ec DK |
588 | } |
589 | ||
590 | struct stats | |
591 | { | |
592 | unsigned names; | |
593 | unsigned space; | |
594 | unsigned bcount; | |
595 | }; | |
596 | ||
b3098486 MH |
597 | static struct stats dx_show_leaf(struct inode *dir, |
598 | struct dx_hash_info *hinfo, | |
599 | struct ext4_dir_entry_2 *de, | |
600 | int size, int show_names) | |
ac27a0ec DK |
601 | { |
602 | unsigned names = 0, space = 0; | |
603 | char *base = (char *) de; | |
604 | struct dx_hash_info h = *hinfo; | |
605 | ||
606 | printk("names: "); | |
607 | while ((char *) de < base + size) | |
608 | { | |
609 | if (de->inode) | |
610 | { | |
611 | if (show_names) | |
612 | { | |
b3098486 MH |
613 | #ifdef CONFIG_EXT4_FS_ENCRYPTION |
614 | int len; | |
615 | char *name; | |
a7550b30 JK |
616 | struct fscrypt_str fname_crypto_str = |
617 | FSTR_INIT(NULL, 0); | |
c936e1ec | 618 | int res = 0; |
b3098486 MH |
619 | |
620 | name = de->name; | |
621 | len = de->name_len; | |
a7550b30 JK |
622 | if (ext4_encrypted_inode(dir)) |
623 | res = fscrypt_get_encryption_info(dir); | |
b7236e21 TT |
624 | if (res) { |
625 | printk(KERN_WARNING "Error setting up" | |
626 | " fname crypto: %d\n", res); | |
b3098486 | 627 | } |
a7550b30 | 628 | if (!fscrypt_has_encryption_key(dir)) { |
b3098486 MH |
629 | /* Directory is not encrypted */ |
630 | ext4fs_dirhash(de->name, | |
631 | de->name_len, &h); | |
632 | printk("%*.s:(U)%x.%u ", len, | |
633 | name, h.hash, | |
634 | (unsigned) ((char *) de | |
635 | - base)); | |
636 | } else { | |
a7550b30 JK |
637 | struct fscrypt_str de_name = |
638 | FSTR_INIT(name, len); | |
639 | ||
b3098486 | 640 | /* Directory is encrypted */ |
a7550b30 JK |
641 | res = fscrypt_fname_alloc_buffer( |
642 | dir, len, | |
b3098486 | 643 | &fname_crypto_str); |
ef1eb3aa | 644 | if (res) |
b3098486 MH |
645 | printk(KERN_WARNING "Error " |
646 | "allocating crypto " | |
647 | "buffer--skipping " | |
648 | "crypto\n"); | |
a7550b30 JK |
649 | res = fscrypt_fname_disk_to_usr(dir, |
650 | 0, 0, &de_name, | |
651 | &fname_crypto_str); | |
ef1eb3aa | 652 | if (res) { |
b3098486 MH |
653 | printk(KERN_WARNING "Error " |
654 | "converting filename " | |
655 | "from disk to usr" | |
656 | "\n"); | |
657 | name = "??"; | |
658 | len = 2; | |
659 | } else { | |
660 | name = fname_crypto_str.name; | |
661 | len = fname_crypto_str.len; | |
662 | } | |
5de0b4d0 TT |
663 | ext4fs_dirhash(de->name, de->name_len, |
664 | &h); | |
b3098486 MH |
665 | printk("%*.s:(E)%x.%u ", len, name, |
666 | h.hash, (unsigned) ((char *) de | |
667 | - base)); | |
a7550b30 JK |
668 | fscrypt_fname_free_buffer( |
669 | &fname_crypto_str); | |
b3098486 MH |
670 | } |
671 | #else | |
ac27a0ec DK |
672 | int len = de->name_len; |
673 | char *name = de->name; | |
617ba13b | 674 | ext4fs_dirhash(de->name, de->name_len, &h); |
b3098486 | 675 | printk("%*.s:%x.%u ", len, name, h.hash, |
265c6a0f | 676 | (unsigned) ((char *) de - base)); |
b3098486 | 677 | #endif |
ac27a0ec | 678 | } |
617ba13b | 679 | space += EXT4_DIR_REC_LEN(de->name_len); |
ac27a0ec DK |
680 | names++; |
681 | } | |
3d0518f4 | 682 | de = ext4_next_entry(de, size); |
ac27a0ec | 683 | } |
d74f3d25 | 684 | printk(KERN_CONT "(%i)\n", names); |
ac27a0ec DK |
685 | return (struct stats) { names, space, 1 }; |
686 | } | |
687 | ||
688 | struct stats dx_show_entries(struct dx_hash_info *hinfo, struct inode *dir, | |
689 | struct dx_entry *entries, int levels) | |
690 | { | |
691 | unsigned blocksize = dir->i_sb->s_blocksize; | |
af5bc92d | 692 | unsigned count = dx_get_count(entries), names = 0, space = 0, i; |
ac27a0ec DK |
693 | unsigned bcount = 0; |
694 | struct buffer_head *bh; | |
ac27a0ec DK |
695 | printk("%i indexed blocks...\n", count); |
696 | for (i = 0; i < count; i++, entries++) | |
697 | { | |
725d26d3 AK |
698 | ext4_lblk_t block = dx_get_block(entries); |
699 | ext4_lblk_t hash = i ? dx_get_hash(entries): 0; | |
ac27a0ec DK |
700 | u32 range = i < count - 1? (dx_get_hash(entries + 1) - hash): ~hash; |
701 | struct stats stats; | |
702 | printk("%s%3u:%03u hash %8x/%8x ",levels?"":" ", i, block, hash, range); | |
1c215028 TT |
703 | bh = ext4_bread(NULL,dir, block, 0); |
704 | if (!bh || IS_ERR(bh)) | |
705 | continue; | |
ac27a0ec DK |
706 | stats = levels? |
707 | dx_show_entries(hinfo, dir, ((struct dx_node *) bh->b_data)->entries, levels - 1): | |
b3098486 MH |
708 | dx_show_leaf(dir, hinfo, (struct ext4_dir_entry_2 *) |
709 | bh->b_data, blocksize, 0); | |
ac27a0ec DK |
710 | names += stats.names; |
711 | space += stats.space; | |
712 | bcount += stats.bcount; | |
af5bc92d | 713 | brelse(bh); |
ac27a0ec DK |
714 | } |
715 | if (bcount) | |
60e6679e | 716 | printk(KERN_DEBUG "%snames %u, fullness %u (%u%%)\n", |
4776004f TT |
717 | levels ? "" : " ", names, space/bcount, |
718 | (space/bcount)*100/blocksize); | |
ac27a0ec DK |
719 | return (struct stats) { names, space, bcount}; |
720 | } | |
721 | #endif /* DX_DEBUG */ | |
722 | ||
723 | /* | |
724 | * Probe for a directory leaf block to search. | |
725 | * | |
726 | * dx_probe can return ERR_BAD_DX_DIR, which means there was a format | |
727 | * error in the directory index, and the caller should fall back to | |
728 | * searching the directory normally. The callers of dx_probe **MUST** | |
729 | * check for this error code, and make sure it never gets reflected | |
730 | * back to userspace. | |
731 | */ | |
732 | static struct dx_frame * | |
5b643f9c | 733 | dx_probe(struct ext4_filename *fname, struct inode *dir, |
dd73b5d5 | 734 | struct dx_hash_info *hinfo, struct dx_frame *frame_in) |
ac27a0ec DK |
735 | { |
736 | unsigned count, indirect; | |
737 | struct dx_entry *at, *entries, *p, *q, *m; | |
738 | struct dx_root *root; | |
ac27a0ec | 739 | struct dx_frame *frame = frame_in; |
dd73b5d5 | 740 | struct dx_frame *ret_err = ERR_PTR(ERR_BAD_DX_DIR); |
ac27a0ec DK |
741 | u32 hash; |
742 | ||
e08ac99f | 743 | memset(frame_in, 0, EXT4_HTREE_LEVEL * sizeof(frame_in[0])); |
dd73b5d5 TT |
744 | frame->bh = ext4_read_dirblock(dir, 0, INDEX); |
745 | if (IS_ERR(frame->bh)) | |
746 | return (struct dx_frame *) frame->bh; | |
747 | ||
748 | root = (struct dx_root *) frame->bh->b_data; | |
ac27a0ec DK |
749 | if (root->info.hash_version != DX_HASH_TEA && |
750 | root->info.hash_version != DX_HASH_HALF_MD4 && | |
751 | root->info.hash_version != DX_HASH_LEGACY) { | |
b03a2f7e AD |
752 | ext4_warning_inode(dir, "Unrecognised inode hash code %u", |
753 | root->info.hash_version); | |
ac27a0ec DK |
754 | goto fail; |
755 | } | |
5b643f9c TT |
756 | if (fname) |
757 | hinfo = &fname->hinfo; | |
ac27a0ec | 758 | hinfo->hash_version = root->info.hash_version; |
f99b2589 TT |
759 | if (hinfo->hash_version <= DX_HASH_TEA) |
760 | hinfo->hash_version += EXT4_SB(dir->i_sb)->s_hash_unsigned; | |
617ba13b | 761 | hinfo->seed = EXT4_SB(dir->i_sb)->s_hash_seed; |
5b643f9c TT |
762 | if (fname && fname_name(fname)) |
763 | ext4fs_dirhash(fname_name(fname), fname_len(fname), hinfo); | |
ac27a0ec DK |
764 | hash = hinfo->hash; |
765 | ||
766 | if (root->info.unused_flags & 1) { | |
b03a2f7e AD |
767 | ext4_warning_inode(dir, "Unimplemented hash flags: %#06x", |
768 | root->info.unused_flags); | |
ac27a0ec DK |
769 | goto fail; |
770 | } | |
771 | ||
b03a2f7e | 772 | indirect = root->info.indirect_levels; |
e08ac99f AB |
773 | if (indirect >= ext4_dir_htree_level(dir->i_sb)) { |
774 | ext4_warning(dir->i_sb, | |
775 | "Directory (ino: %lu) htree depth %#06x exceed" | |
776 | "supported value", dir->i_ino, | |
777 | ext4_dir_htree_level(dir->i_sb)); | |
778 | if (ext4_dir_htree_level(dir->i_sb) < EXT4_HTREE_LEVEL) { | |
779 | ext4_warning(dir->i_sb, "Enable large directory " | |
780 | "feature to access it"); | |
781 | } | |
ac27a0ec DK |
782 | goto fail; |
783 | } | |
784 | ||
b03a2f7e AD |
785 | entries = (struct dx_entry *)(((char *)&root->info) + |
786 | root->info.info_length); | |
3d82abae ES |
787 | |
788 | if (dx_get_limit(entries) != dx_root_limit(dir, | |
789 | root->info.info_length)) { | |
b03a2f7e AD |
790 | ext4_warning_inode(dir, "dx entry: limit %u != root limit %u", |
791 | dx_get_limit(entries), | |
792 | dx_root_limit(dir, root->info.info_length)); | |
3d82abae ES |
793 | goto fail; |
794 | } | |
795 | ||
af5bc92d | 796 | dxtrace(printk("Look up %x", hash)); |
dd73b5d5 | 797 | while (1) { |
ac27a0ec | 798 | count = dx_get_count(entries); |
3d82abae | 799 | if (!count || count > dx_get_limit(entries)) { |
b03a2f7e AD |
800 | ext4_warning_inode(dir, |
801 | "dx entry: count %u beyond limit %u", | |
802 | count, dx_get_limit(entries)); | |
dd73b5d5 | 803 | goto fail; |
3d82abae ES |
804 | } |
805 | ||
ac27a0ec DK |
806 | p = entries + 1; |
807 | q = entries + count - 1; | |
dd73b5d5 | 808 | while (p <= q) { |
b03a2f7e | 809 | m = p + (q - p) / 2; |
d74f3d25 | 810 | dxtrace(printk(KERN_CONT ".")); |
ac27a0ec DK |
811 | if (dx_get_hash(m) > hash) |
812 | q = m - 1; | |
813 | else | |
814 | p = m + 1; | |
815 | } | |
816 | ||
dd73b5d5 | 817 | if (0) { // linear search cross check |
ac27a0ec DK |
818 | unsigned n = count - 1; |
819 | at = entries; | |
820 | while (n--) | |
821 | { | |
d74f3d25 | 822 | dxtrace(printk(KERN_CONT ",")); |
ac27a0ec DK |
823 | if (dx_get_hash(++at) > hash) |
824 | { | |
825 | at--; | |
826 | break; | |
827 | } | |
828 | } | |
829 | assert (at == p - 1); | |
830 | } | |
831 | ||
832 | at = p - 1; | |
d74f3d25 JP |
833 | dxtrace(printk(KERN_CONT " %x->%u\n", |
834 | at == entries ? 0 : dx_get_hash(at), | |
b03a2f7e | 835 | dx_get_block(at))); |
ac27a0ec DK |
836 | frame->entries = entries; |
837 | frame->at = at; | |
dd73b5d5 TT |
838 | if (!indirect--) |
839 | return frame; | |
840 | frame++; | |
841 | frame->bh = ext4_read_dirblock(dir, dx_get_block(at), INDEX); | |
842 | if (IS_ERR(frame->bh)) { | |
843 | ret_err = (struct dx_frame *) frame->bh; | |
844 | frame->bh = NULL; | |
845 | goto fail; | |
dbe89444 | 846 | } |
dd73b5d5 | 847 | entries = ((struct dx_node *) frame->bh->b_data)->entries; |
dbe89444 | 848 | |
b03a2f7e AD |
849 | if (dx_get_limit(entries) != dx_node_limit(dir)) { |
850 | ext4_warning_inode(dir, | |
851 | "dx entry: limit %u != node limit %u", | |
852 | dx_get_limit(entries), dx_node_limit(dir)); | |
dd73b5d5 | 853 | goto fail; |
3d82abae | 854 | } |
ac27a0ec | 855 | } |
dd73b5d5 | 856 | fail: |
ac27a0ec DK |
857 | while (frame >= frame_in) { |
858 | brelse(frame->bh); | |
859 | frame--; | |
860 | } | |
b3098486 | 861 | |
dd73b5d5 | 862 | if (ret_err == ERR_PTR(ERR_BAD_DX_DIR)) |
b03a2f7e AD |
863 | ext4_warning_inode(dir, |
864 | "Corrupt directory, running e2fsck is recommended"); | |
dd73b5d5 | 865 | return ret_err; |
ac27a0ec DK |
866 | } |
867 | ||
b03a2f7e | 868 | static void dx_release(struct dx_frame *frames) |
ac27a0ec | 869 | { |
e08ac99f AB |
870 | struct dx_root_info *info; |
871 | int i; | |
872 | ||
ac27a0ec DK |
873 | if (frames[0].bh == NULL) |
874 | return; | |
875 | ||
e08ac99f AB |
876 | info = &((struct dx_root *)frames[0].bh->b_data)->info; |
877 | for (i = 0; i <= info->indirect_levels; i++) { | |
878 | if (frames[i].bh == NULL) | |
879 | break; | |
880 | brelse(frames[i].bh); | |
881 | frames[i].bh = NULL; | |
882 | } | |
ac27a0ec DK |
883 | } |
884 | ||
885 | /* | |
886 | * This function increments the frame pointer to search the next leaf | |
887 | * block, and reads in the necessary intervening nodes if the search | |
888 | * should be necessary. Whether or not the search is necessary is | |
889 | * controlled by the hash parameter. If the hash value is even, then | |
890 | * the search is only continued if the next block starts with that | |
891 | * hash value. This is used if we are searching for a specific file. | |
892 | * | |
893 | * If the hash value is HASH_NB_ALWAYS, then always go to the next block. | |
894 | * | |
895 | * This function returns 1 if the caller should continue to search, | |
896 | * or 0 if it should not. If there is an error reading one of the | |
897 | * index blocks, it will a negative error code. | |
898 | * | |
899 | * If start_hash is non-null, it will be filled in with the starting | |
900 | * hash of the next page. | |
901 | */ | |
617ba13b | 902 | static int ext4_htree_next_block(struct inode *dir, __u32 hash, |
ac27a0ec DK |
903 | struct dx_frame *frame, |
904 | struct dx_frame *frames, | |
905 | __u32 *start_hash) | |
906 | { | |
907 | struct dx_frame *p; | |
908 | struct buffer_head *bh; | |
dc6982ff | 909 | int num_frames = 0; |
ac27a0ec DK |
910 | __u32 bhash; |
911 | ||
912 | p = frame; | |
913 | /* | |
914 | * Find the next leaf page by incrementing the frame pointer. | |
915 | * If we run out of entries in the interior node, loop around and | |
916 | * increment pointer in the parent node. When we break out of | |
917 | * this loop, num_frames indicates the number of interior | |
918 | * nodes need to be read. | |
919 | */ | |
920 | while (1) { | |
921 | if (++(p->at) < p->entries + dx_get_count(p->entries)) | |
922 | break; | |
923 | if (p == frames) | |
924 | return 0; | |
925 | num_frames++; | |
926 | p--; | |
927 | } | |
928 | ||
929 | /* | |
930 | * If the hash is 1, then continue only if the next page has a | |
931 | * continuation hash of any value. This is used for readdir | |
932 | * handling. Otherwise, check to see if the hash matches the | |
933 | * desired contiuation hash. If it doesn't, return since | |
934 | * there's no point to read in the successive index pages. | |
935 | */ | |
936 | bhash = dx_get_hash(p->at); | |
937 | if (start_hash) | |
938 | *start_hash = bhash; | |
939 | if ((hash & 1) == 0) { | |
940 | if ((bhash & ~1) != hash) | |
941 | return 0; | |
942 | } | |
943 | /* | |
944 | * If the hash is HASH_NB_ALWAYS, we always go to the next | |
945 | * block so no check is necessary | |
946 | */ | |
947 | while (num_frames--) { | |
dc6982ff TT |
948 | bh = ext4_read_dirblock(dir, dx_get_block(p->at), INDEX); |
949 | if (IS_ERR(bh)) | |
950 | return PTR_ERR(bh); | |
ac27a0ec | 951 | p++; |
af5bc92d | 952 | brelse(p->bh); |
ac27a0ec DK |
953 | p->bh = bh; |
954 | p->at = p->entries = ((struct dx_node *) bh->b_data)->entries; | |
955 | } | |
956 | return 1; | |
957 | } | |
958 | ||
959 | ||
ac27a0ec DK |
960 | /* |
961 | * This function fills a red-black tree with information from a | |
962 | * directory block. It returns the number directory entries loaded | |
963 | * into the tree. If there is an error it is returned in err. | |
964 | */ | |
965 | static int htree_dirblock_to_tree(struct file *dir_file, | |
725d26d3 | 966 | struct inode *dir, ext4_lblk_t block, |
ac27a0ec DK |
967 | struct dx_hash_info *hinfo, |
968 | __u32 start_hash, __u32 start_minor_hash) | |
969 | { | |
970 | struct buffer_head *bh; | |
617ba13b | 971 | struct ext4_dir_entry_2 *de, *top; |
90b0a973 | 972 | int err = 0, count = 0; |
a7550b30 | 973 | struct fscrypt_str fname_crypto_str = FSTR_INIT(NULL, 0), tmp_str; |
ac27a0ec | 974 | |
725d26d3 AK |
975 | dxtrace(printk(KERN_INFO "In htree dirblock_to_tree: block %lu\n", |
976 | (unsigned long)block)); | |
dc6982ff TT |
977 | bh = ext4_read_dirblock(dir, block, DIRENT); |
978 | if (IS_ERR(bh)) | |
979 | return PTR_ERR(bh); | |
b0336e8d | 980 | |
617ba13b MC |
981 | de = (struct ext4_dir_entry_2 *) bh->b_data; |
982 | top = (struct ext4_dir_entry_2 *) ((char *) de + | |
ac27a0ec | 983 | dir->i_sb->s_blocksize - |
617ba13b | 984 | EXT4_DIR_REC_LEN(0)); |
1f3862b5 MH |
985 | #ifdef CONFIG_EXT4_FS_ENCRYPTION |
986 | /* Check if the directory is encrypted */ | |
b7236e21 | 987 | if (ext4_encrypted_inode(dir)) { |
a7550b30 | 988 | err = fscrypt_get_encryption_info(dir); |
c936e1ec TT |
989 | if (err < 0) { |
990 | brelse(bh); | |
991 | return err; | |
992 | } | |
a7550b30 | 993 | err = fscrypt_fname_alloc_buffer(dir, EXT4_NAME_LEN, |
1f3862b5 MH |
994 | &fname_crypto_str); |
995 | if (err < 0) { | |
1f3862b5 MH |
996 | brelse(bh); |
997 | return err; | |
998 | } | |
999 | } | |
1000 | #endif | |
3d0518f4 | 1001 | for (; de < top; de = ext4_next_entry(de, dir->i_sb->s_blocksize)) { |
f7c21177 | 1002 | if (ext4_check_dir_entry(dir, NULL, de, bh, |
226ba972 | 1003 | bh->b_data, bh->b_size, |
cad3f007 TT |
1004 | (block<<EXT4_BLOCK_SIZE_BITS(dir->i_sb)) |
1005 | + ((char *)de - bh->b_data))) { | |
64cb9273 AV |
1006 | /* silently ignore the rest of the block */ |
1007 | break; | |
e6c40211 | 1008 | } |
617ba13b | 1009 | ext4fs_dirhash(de->name, de->name_len, hinfo); |
ac27a0ec DK |
1010 | if ((hinfo->hash < start_hash) || |
1011 | ((hinfo->hash == start_hash) && | |
1012 | (hinfo->minor_hash < start_minor_hash))) | |
1013 | continue; | |
1014 | if (de->inode == 0) | |
1015 | continue; | |
b7236e21 | 1016 | if (!ext4_encrypted_inode(dir)) { |
1f3862b5 MH |
1017 | tmp_str.name = de->name; |
1018 | tmp_str.len = de->name_len; | |
1019 | err = ext4_htree_store_dirent(dir_file, | |
1020 | hinfo->hash, hinfo->minor_hash, de, | |
1021 | &tmp_str); | |
1022 | } else { | |
d2299590 | 1023 | int save_len = fname_crypto_str.len; |
a7550b30 JK |
1024 | struct fscrypt_str de_name = FSTR_INIT(de->name, |
1025 | de->name_len); | |
d2299590 | 1026 | |
1f3862b5 | 1027 | /* Directory is encrypted */ |
a7550b30 JK |
1028 | err = fscrypt_fname_disk_to_usr(dir, hinfo->hash, |
1029 | hinfo->minor_hash, &de_name, | |
1030 | &fname_crypto_str); | |
ef1eb3aa | 1031 | if (err) { |
1f3862b5 MH |
1032 | count = err; |
1033 | goto errout; | |
1034 | } | |
1035 | err = ext4_htree_store_dirent(dir_file, | |
1036 | hinfo->hash, hinfo->minor_hash, de, | |
1037 | &fname_crypto_str); | |
d2299590 | 1038 | fname_crypto_str.len = save_len; |
1f3862b5 | 1039 | } |
2f61830a | 1040 | if (err != 0) { |
1f3862b5 MH |
1041 | count = err; |
1042 | goto errout; | |
ac27a0ec DK |
1043 | } |
1044 | count++; | |
1045 | } | |
1f3862b5 | 1046 | errout: |
ac27a0ec | 1047 | brelse(bh); |
1f3862b5 | 1048 | #ifdef CONFIG_EXT4_FS_ENCRYPTION |
a7550b30 | 1049 | fscrypt_fname_free_buffer(&fname_crypto_str); |
1f3862b5 | 1050 | #endif |
ac27a0ec DK |
1051 | return count; |
1052 | } | |
1053 | ||
1054 | ||
1055 | /* | |
1056 | * This function fills a red-black tree with information from a | |
1057 | * directory. We start scanning the directory in hash order, starting | |
1058 | * at start_hash and start_minor_hash. | |
1059 | * | |
1060 | * This function returns the number of entries inserted into the tree, | |
1061 | * or a negative error code. | |
1062 | */ | |
617ba13b | 1063 | int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, |
ac27a0ec DK |
1064 | __u32 start_minor_hash, __u32 *next_hash) |
1065 | { | |
1066 | struct dx_hash_info hinfo; | |
617ba13b | 1067 | struct ext4_dir_entry_2 *de; |
e08ac99f | 1068 | struct dx_frame frames[EXT4_HTREE_LEVEL], *frame; |
ac27a0ec | 1069 | struct inode *dir; |
725d26d3 | 1070 | ext4_lblk_t block; |
ac27a0ec | 1071 | int count = 0; |
725d26d3 | 1072 | int ret, err; |
ac27a0ec | 1073 | __u32 hashval; |
a7550b30 | 1074 | struct fscrypt_str tmp_str; |
ac27a0ec | 1075 | |
60e6679e | 1076 | dxtrace(printk(KERN_DEBUG "In htree_fill_tree, start hash: %x:%x\n", |
4776004f | 1077 | start_hash, start_minor_hash)); |
496ad9aa | 1078 | dir = file_inode(dir_file); |
12e9b892 | 1079 | if (!(ext4_test_inode_flag(dir, EXT4_INODE_INDEX))) { |
617ba13b | 1080 | hinfo.hash_version = EXT4_SB(dir->i_sb)->s_def_hash_version; |
f99b2589 TT |
1081 | if (hinfo.hash_version <= DX_HASH_TEA) |
1082 | hinfo.hash_version += | |
1083 | EXT4_SB(dir->i_sb)->s_hash_unsigned; | |
617ba13b | 1084 | hinfo.seed = EXT4_SB(dir->i_sb)->s_hash_seed; |
8af0f082 TM |
1085 | if (ext4_has_inline_data(dir)) { |
1086 | int has_inline_data = 1; | |
1087 | count = htree_inlinedir_to_tree(dir_file, dir, 0, | |
1088 | &hinfo, start_hash, | |
1089 | start_minor_hash, | |
1090 | &has_inline_data); | |
1091 | if (has_inline_data) { | |
1092 | *next_hash = ~0; | |
1093 | return count; | |
1094 | } | |
1095 | } | |
ac27a0ec DK |
1096 | count = htree_dirblock_to_tree(dir_file, dir, 0, &hinfo, |
1097 | start_hash, start_minor_hash); | |
1098 | *next_hash = ~0; | |
1099 | return count; | |
1100 | } | |
1101 | hinfo.hash = start_hash; | |
1102 | hinfo.minor_hash = 0; | |
dd73b5d5 TT |
1103 | frame = dx_probe(NULL, dir, &hinfo, frames); |
1104 | if (IS_ERR(frame)) | |
1105 | return PTR_ERR(frame); | |
ac27a0ec DK |
1106 | |
1107 | /* Add '.' and '..' from the htree header */ | |
1108 | if (!start_hash && !start_minor_hash) { | |
617ba13b | 1109 | de = (struct ext4_dir_entry_2 *) frames[0].bh->b_data; |
2f61830a TT |
1110 | tmp_str.name = de->name; |
1111 | tmp_str.len = de->name_len; | |
1112 | err = ext4_htree_store_dirent(dir_file, 0, 0, | |
1113 | de, &tmp_str); | |
1114 | if (err != 0) | |
ac27a0ec DK |
1115 | goto errout; |
1116 | count++; | |
1117 | } | |
1118 | if (start_hash < 2 || (start_hash ==2 && start_minor_hash==0)) { | |
617ba13b | 1119 | de = (struct ext4_dir_entry_2 *) frames[0].bh->b_data; |
3d0518f4 | 1120 | de = ext4_next_entry(de, dir->i_sb->s_blocksize); |
2f61830a TT |
1121 | tmp_str.name = de->name; |
1122 | tmp_str.len = de->name_len; | |
1123 | err = ext4_htree_store_dirent(dir_file, 2, 0, | |
1124 | de, &tmp_str); | |
1125 | if (err != 0) | |
ac27a0ec DK |
1126 | goto errout; |
1127 | count++; | |
1128 | } | |
1129 | ||
1130 | while (1) { | |
1f60fbe7 TT |
1131 | if (fatal_signal_pending(current)) { |
1132 | err = -ERESTARTSYS; | |
1133 | goto errout; | |
1134 | } | |
1135 | cond_resched(); | |
ac27a0ec DK |
1136 | block = dx_get_block(frame->at); |
1137 | ret = htree_dirblock_to_tree(dir_file, dir, block, &hinfo, | |
1138 | start_hash, start_minor_hash); | |
1139 | if (ret < 0) { | |
1140 | err = ret; | |
1141 | goto errout; | |
1142 | } | |
1143 | count += ret; | |
1144 | hashval = ~0; | |
617ba13b | 1145 | ret = ext4_htree_next_block(dir, HASH_NB_ALWAYS, |
ac27a0ec DK |
1146 | frame, frames, &hashval); |
1147 | *next_hash = hashval; | |
1148 | if (ret < 0) { | |
1149 | err = ret; | |
1150 | goto errout; | |
1151 | } | |
1152 | /* | |
1153 | * Stop if: (a) there are no more entries, or | |
1154 | * (b) we have inserted at least one entry and the | |
1155 | * next hash value is not a continuation | |
1156 | */ | |
1157 | if ((ret == 0) || | |
1158 | (count && ((hashval & 1) == 0))) | |
1159 | break; | |
1160 | } | |
1161 | dx_release(frames); | |
4776004f TT |
1162 | dxtrace(printk(KERN_DEBUG "Fill tree: returned %d entries, " |
1163 | "next hash: %x\n", count, *next_hash)); | |
ac27a0ec DK |
1164 | return count; |
1165 | errout: | |
1166 | dx_release(frames); | |
1167 | return (err); | |
1168 | } | |
1169 | ||
7335cd3b TM |
1170 | static inline int search_dirblock(struct buffer_head *bh, |
1171 | struct inode *dir, | |
5b643f9c | 1172 | struct ext4_filename *fname, |
7335cd3b TM |
1173 | unsigned int offset, |
1174 | struct ext4_dir_entry_2 **res_dir) | |
1175 | { | |
5b643f9c | 1176 | return ext4_search_dir(bh, bh->b_data, dir->i_sb->s_blocksize, dir, |
d6b97550 | 1177 | fname, offset, res_dir); |
7335cd3b TM |
1178 | } |
1179 | ||
ac27a0ec DK |
1180 | /* |
1181 | * Directory block splitting, compacting | |
1182 | */ | |
1183 | ||
ef2b02d3 ES |
1184 | /* |
1185 | * Create map of hash values, offsets, and sizes, stored at end of block. | |
1186 | * Returns number of entries mapped. | |
1187 | */ | |
1f3862b5 MH |
1188 | static int dx_make_map(struct inode *dir, struct ext4_dir_entry_2 *de, |
1189 | unsigned blocksize, struct dx_hash_info *hinfo, | |
8bad4597 | 1190 | struct dx_map_entry *map_tail) |
ac27a0ec DK |
1191 | { |
1192 | int count = 0; | |
1193 | char *base = (char *) de; | |
1194 | struct dx_hash_info h = *hinfo; | |
1195 | ||
8bad4597 | 1196 | while ((char *) de < base + blocksize) { |
ac27a0ec | 1197 | if (de->name_len && de->inode) { |
617ba13b | 1198 | ext4fs_dirhash(de->name, de->name_len, &h); |
ac27a0ec DK |
1199 | map_tail--; |
1200 | map_tail->hash = h.hash; | |
9aee2286 | 1201 | map_tail->offs = ((char *) de - base)>>2; |
ef2b02d3 | 1202 | map_tail->size = le16_to_cpu(de->rec_len); |
ac27a0ec DK |
1203 | count++; |
1204 | cond_resched(); | |
1205 | } | |
1206 | /* XXX: do we need to check rec_len == 0 case? -Chris */ | |
3d0518f4 | 1207 | de = ext4_next_entry(de, blocksize); |
ac27a0ec DK |
1208 | } |
1209 | return count; | |
1210 | } | |
1211 | ||
ef2b02d3 | 1212 | /* Sort map by hash value */ |
ac27a0ec DK |
1213 | static void dx_sort_map (struct dx_map_entry *map, unsigned count) |
1214 | { | |
63f57933 AM |
1215 | struct dx_map_entry *p, *q, *top = map + count - 1; |
1216 | int more; | |
1217 | /* Combsort until bubble sort doesn't suck */ | |
1218 | while (count > 2) { | |
1219 | count = count*10/13; | |
1220 | if (count - 9 < 2) /* 9, 10 -> 11 */ | |
1221 | count = 11; | |
1222 | for (p = top, q = p - count; q >= map; p--, q--) | |
1223 | if (p->hash < q->hash) | |
1224 | swap(*p, *q); | |
1225 | } | |
1226 | /* Garden variety bubble sort */ | |
1227 | do { | |
1228 | more = 0; | |
1229 | q = top; | |
1230 | while (q-- > map) { | |
1231 | if (q[1].hash >= q[0].hash) | |
ac27a0ec | 1232 | continue; |
63f57933 AM |
1233 | swap(*(q+1), *q); |
1234 | more = 1; | |
ac27a0ec DK |
1235 | } |
1236 | } while(more); | |
1237 | } | |
1238 | ||
725d26d3 | 1239 | static void dx_insert_block(struct dx_frame *frame, u32 hash, ext4_lblk_t block) |
ac27a0ec DK |
1240 | { |
1241 | struct dx_entry *entries = frame->entries; | |
1242 | struct dx_entry *old = frame->at, *new = old + 1; | |
1243 | int count = dx_get_count(entries); | |
1244 | ||
1245 | assert(count < dx_get_limit(entries)); | |
1246 | assert(old < entries + count); | |
1247 | memmove(new + 1, new, (char *)(entries + count) - (char *)(new)); | |
1248 | dx_set_hash(new, hash); | |
1249 | dx_set_block(new, block); | |
1250 | dx_set_count(entries, count + 1); | |
1251 | } | |
ac27a0ec | 1252 | |
ac27a0ec | 1253 | /* |
d9b9f8d5 | 1254 | * Test whether a directory entry matches the filename being searched for. |
ac27a0ec | 1255 | * |
d9b9f8d5 | 1256 | * Return: %true if the directory entry matches, otherwise %false. |
ac27a0ec | 1257 | */ |
d9b9f8d5 EB |
1258 | static inline bool ext4_match(const struct ext4_filename *fname, |
1259 | const struct ext4_dir_entry_2 *de) | |
ac27a0ec | 1260 | { |
067d1023 | 1261 | struct fscrypt_name f; |
1f3862b5 | 1262 | |
ac27a0ec | 1263 | if (!de->inode) |
d9b9f8d5 | 1264 | return false; |
1f3862b5 | 1265 | |
067d1023 EB |
1266 | f.usr_fname = fname->usr_fname; |
1267 | f.disk_name = fname->disk_name; | |
1f3862b5 | 1268 | #ifdef CONFIG_EXT4_FS_ENCRYPTION |
067d1023 | 1269 | f.crypto_buf = fname->crypto_buf; |
1f3862b5 | 1270 | #endif |
067d1023 | 1271 | return fscrypt_match_name(&f, de->name, de->name_len); |
ac27a0ec DK |
1272 | } |
1273 | ||
1274 | /* | |
1275 | * Returns 0 if not found, -1 on failure, and 1 on success | |
1276 | */ | |
5b643f9c TT |
1277 | int ext4_search_dir(struct buffer_head *bh, char *search_buf, int buf_size, |
1278 | struct inode *dir, struct ext4_filename *fname, | |
5b643f9c | 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 | 1284 | |
7335cd3b TM |
1285 | de = (struct ext4_dir_entry_2 *)search_buf; |
1286 | dlimit = search_buf + buf_size; | |
ac27a0ec DK |
1287 | while ((char *) de < dlimit) { |
1288 | /* this code is executed quadratically often */ | |
1289 | /* do minimal checking `by hand' */ | |
d9b9f8d5 EB |
1290 | if ((char *) de + de->name_len <= dlimit && |
1291 | ext4_match(fname, de)) { | |
1292 | /* found a match - just to be sure, do | |
1293 | * a full check */ | |
1294 | if (ext4_check_dir_entry(dir, NULL, de, bh, bh->b_data, | |
1295 | bh->b_size, offset)) | |
1296 | return -1; | |
1297 | *res_dir = de; | |
1298 | return 1; | |
ac27a0ec DK |
1299 | } |
1300 | /* prevent looping on a bad block */ | |
3d0518f4 WY |
1301 | de_len = ext4_rec_len_from_disk(de->rec_len, |
1302 | dir->i_sb->s_blocksize); | |
d9b9f8d5 EB |
1303 | if (de_len <= 0) |
1304 | return -1; | |
ac27a0ec | 1305 | offset += de_len; |
617ba13b | 1306 | de = (struct ext4_dir_entry_2 *) ((char *) de + de_len); |
ac27a0ec | 1307 | } |
d9b9f8d5 | 1308 | return 0; |
ac27a0ec DK |
1309 | } |
1310 | ||
c6af8803 DW |
1311 | static int is_dx_internal_node(struct inode *dir, ext4_lblk_t block, |
1312 | struct ext4_dir_entry *de) | |
1313 | { | |
1314 | struct super_block *sb = dir->i_sb; | |
1315 | ||
1316 | if (!is_dx(dir)) | |
1317 | return 0; | |
1318 | if (block == 0) | |
1319 | return 1; | |
1320 | if (de->inode == 0 && | |
1321 | ext4_rec_len_from_disk(de->rec_len, sb->s_blocksize) == | |
1322 | sb->s_blocksize) | |
1323 | return 1; | |
1324 | return 0; | |
1325 | } | |
ac27a0ec DK |
1326 | |
1327 | /* | |
617ba13b | 1328 | * ext4_find_entry() |
ac27a0ec DK |
1329 | * |
1330 | * finds an entry in the specified directory with the wanted name. It | |
1331 | * returns the cache buffer in which the entry was found, and the entry | |
1332 | * itself (as a parameter - res_dir). It does NOT read the inode of the | |
1333 | * entry - you'll have to do that yourself if you want to. | |
1334 | * | |
1335 | * The returned buffer_head has ->b_count elevated. The caller is expected | |
1336 | * to brelse() it when appropriate. | |
1337 | */ | |
f702ba0f TT |
1338 | static struct buffer_head * ext4_find_entry (struct inode *dir, |
1339 | const struct qstr *d_name, | |
32f7f22c TM |
1340 | struct ext4_dir_entry_2 **res_dir, |
1341 | int *inlined) | |
ac27a0ec | 1342 | { |
af5bc92d TT |
1343 | struct super_block *sb; |
1344 | struct buffer_head *bh_use[NAMEI_RA_SIZE]; | |
1345 | struct buffer_head *bh, *ret = NULL; | |
9699d4f9 | 1346 | ext4_lblk_t start, block; |
8941ec8b | 1347 | const u8 *name = d_name->name; |
9699d4f9 | 1348 | size_t ra_max = 0; /* Number of bh's in the readahead |
ac27a0ec | 1349 | buffer, bh_use[] */ |
9699d4f9 | 1350 | size_t ra_ptr = 0; /* Current index into readahead |
ac27a0ec | 1351 | buffer */ |
725d26d3 | 1352 | ext4_lblk_t nblocks; |
5b643f9c TT |
1353 | int i, namelen, retval; |
1354 | struct ext4_filename fname; | |
ac27a0ec DK |
1355 | |
1356 | *res_dir = NULL; | |
1357 | sb = dir->i_sb; | |
f702ba0f | 1358 | namelen = d_name->len; |
617ba13b | 1359 | if (namelen > EXT4_NAME_LEN) |
ac27a0ec | 1360 | return NULL; |
e8e948e7 | 1361 | |
5b643f9c | 1362 | retval = ext4_fname_setup_filename(dir, d_name, 1, &fname); |
54475f53 EB |
1363 | if (retval == -ENOENT) |
1364 | return NULL; | |
5b643f9c TT |
1365 | if (retval) |
1366 | return ERR_PTR(retval); | |
1367 | ||
e8e948e7 TM |
1368 | if (ext4_has_inline_data(dir)) { |
1369 | int has_inline_data = 1; | |
d6b97550 | 1370 | ret = ext4_find_inline_entry(dir, &fname, res_dir, |
e8e948e7 | 1371 | &has_inline_data); |
32f7f22c TM |
1372 | if (has_inline_data) { |
1373 | if (inlined) | |
1374 | *inlined = 1; | |
5b643f9c | 1375 | goto cleanup_and_exit; |
32f7f22c | 1376 | } |
e8e948e7 TM |
1377 | } |
1378 | ||
8941ec8b | 1379 | if ((namelen <= 2) && (name[0] == '.') && |
6d5c3aa8 | 1380 | (name[1] == '.' || name[1] == '\0')) { |
8941ec8b TT |
1381 | /* |
1382 | * "." or ".." will only be in the first block | |
1383 | * NFS may look up ".."; "." should be handled by the VFS | |
1384 | */ | |
1385 | block = start = 0; | |
1386 | nblocks = 1; | |
1387 | goto restart; | |
1388 | } | |
ac27a0ec | 1389 | if (is_dx(dir)) { |
5b643f9c | 1390 | ret = ext4_dx_find_entry(dir, &fname, res_dir); |
ac27a0ec DK |
1391 | /* |
1392 | * On success, or if the error was file not found, | |
1393 | * return. Otherwise, fall back to doing a search the | |
1394 | * old fashioned way. | |
1395 | */ | |
5b643f9c TT |
1396 | if (!IS_ERR(ret) || PTR_ERR(ret) != ERR_BAD_DX_DIR) |
1397 | goto cleanup_and_exit; | |
4776004f TT |
1398 | dxtrace(printk(KERN_DEBUG "ext4_find_entry: dx failed, " |
1399 | "falling back\n")); | |
ac27a0ec | 1400 | } |
617ba13b MC |
1401 | nblocks = dir->i_size >> EXT4_BLOCK_SIZE_BITS(sb); |
1402 | start = EXT4_I(dir)->i_dir_start_lookup; | |
ac27a0ec DK |
1403 | if (start >= nblocks) |
1404 | start = 0; | |
1405 | block = start; | |
1406 | restart: | |
1407 | do { | |
1408 | /* | |
1409 | * We deal with the read-ahead logic here. | |
1410 | */ | |
1411 | if (ra_ptr >= ra_max) { | |
1412 | /* Refill the readahead buffer */ | |
1413 | ra_ptr = 0; | |
9699d4f9 TE |
1414 | if (block < start) |
1415 | ra_max = start - block; | |
1416 | else | |
1417 | ra_max = nblocks - block; | |
1418 | ra_max = min(ra_max, ARRAY_SIZE(bh_use)); | |
1419 | retval = ext4_bread_batch(dir, block, ra_max, | |
1420 | false /* wait */, bh_use); | |
1421 | if (retval) { | |
1422 | ret = ERR_PTR(retval); | |
1423 | ra_max = 0; | |
1424 | goto cleanup_and_exit; | |
ac27a0ec DK |
1425 | } |
1426 | } | |
1427 | if ((bh = bh_use[ra_ptr++]) == NULL) | |
1428 | goto next; | |
1429 | wait_on_buffer(bh); | |
1430 | if (!buffer_uptodate(bh)) { | |
24676da4 TT |
1431 | EXT4_ERROR_INODE(dir, "reading directory lblock %lu", |
1432 | (unsigned long) block); | |
ac27a0ec | 1433 | brelse(bh); |
6febe6f2 KK |
1434 | ret = ERR_PTR(-EIO); |
1435 | goto cleanup_and_exit; | |
ac27a0ec | 1436 | } |
b0336e8d | 1437 | if (!buffer_verified(bh) && |
c6af8803 DW |
1438 | !is_dx_internal_node(dir, block, |
1439 | (struct ext4_dir_entry *)bh->b_data) && | |
b0336e8d DW |
1440 | !ext4_dirent_csum_verify(dir, |
1441 | (struct ext4_dir_entry *)bh->b_data)) { | |
1442 | EXT4_ERROR_INODE(dir, "checksumming directory " | |
1443 | "block %lu", (unsigned long)block); | |
1444 | brelse(bh); | |
bdddf342 TT |
1445 | ret = ERR_PTR(-EFSBADCRC); |
1446 | goto cleanup_and_exit; | |
b0336e8d DW |
1447 | } |
1448 | set_buffer_verified(bh); | |
d6b97550 | 1449 | i = search_dirblock(bh, dir, &fname, |
617ba13b | 1450 | block << EXT4_BLOCK_SIZE_BITS(sb), res_dir); |
ac27a0ec | 1451 | if (i == 1) { |
617ba13b | 1452 | EXT4_I(dir)->i_dir_start_lookup = block; |
ac27a0ec DK |
1453 | ret = bh; |
1454 | goto cleanup_and_exit; | |
1455 | } else { | |
1456 | brelse(bh); | |
1457 | if (i < 0) | |
1458 | goto cleanup_and_exit; | |
1459 | } | |
1460 | next: | |
1461 | if (++block >= nblocks) | |
1462 | block = 0; | |
1463 | } while (block != start); | |
1464 | ||
1465 | /* | |
1466 | * If the directory has grown while we were searching, then | |
1467 | * search the last part of the directory before giving up. | |
1468 | */ | |
1469 | block = nblocks; | |
617ba13b | 1470 | nblocks = dir->i_size >> EXT4_BLOCK_SIZE_BITS(sb); |
ac27a0ec DK |
1471 | if (block < nblocks) { |
1472 | start = 0; | |
1473 | goto restart; | |
1474 | } | |
1475 | ||
1476 | cleanup_and_exit: | |
1477 | /* Clean up the read-ahead blocks */ | |
1478 | for (; ra_ptr < ra_max; ra_ptr++) | |
af5bc92d | 1479 | brelse(bh_use[ra_ptr]); |
5b643f9c | 1480 | ext4_fname_free_filename(&fname); |
ac27a0ec DK |
1481 | return ret; |
1482 | } | |
1483 | ||
5b643f9c TT |
1484 | static struct buffer_head * ext4_dx_find_entry(struct inode *dir, |
1485 | struct ext4_filename *fname, | |
1486 | struct ext4_dir_entry_2 **res_dir) | |
ac27a0ec | 1487 | { |
8941ec8b | 1488 | struct super_block * sb = dir->i_sb; |
e08ac99f | 1489 | struct dx_frame frames[EXT4_HTREE_LEVEL], *frame; |
ac27a0ec | 1490 | struct buffer_head *bh; |
725d26d3 | 1491 | ext4_lblk_t block; |
ac27a0ec | 1492 | int retval; |
ac27a0ec | 1493 | |
1f3862b5 MH |
1494 | #ifdef CONFIG_EXT4_FS_ENCRYPTION |
1495 | *res_dir = NULL; | |
1496 | #endif | |
5b643f9c | 1497 | frame = dx_probe(fname, dir, NULL, frames); |
dd73b5d5 TT |
1498 | if (IS_ERR(frame)) |
1499 | return (struct buffer_head *) frame; | |
ac27a0ec DK |
1500 | do { |
1501 | block = dx_get_block(frame->at); | |
dc6982ff | 1502 | bh = ext4_read_dirblock(dir, block, DIRENT); |
537d8f93 | 1503 | if (IS_ERR(bh)) |
b0336e8d | 1504 | goto errout; |
537d8f93 | 1505 | |
d6b97550 | 1506 | retval = search_dirblock(bh, dir, fname, |
7845c049 TT |
1507 | block << EXT4_BLOCK_SIZE_BITS(sb), |
1508 | res_dir); | |
537d8f93 TT |
1509 | if (retval == 1) |
1510 | goto success; | |
af5bc92d | 1511 | brelse(bh); |
7845c049 | 1512 | if (retval == -1) { |
537d8f93 | 1513 | bh = ERR_PTR(ERR_BAD_DX_DIR); |
7845c049 TT |
1514 | goto errout; |
1515 | } | |
1516 | ||
ac27a0ec | 1517 | /* Check to see if we should continue to search */ |
5b643f9c | 1518 | retval = ext4_htree_next_block(dir, fname->hinfo.hash, frame, |
ac27a0ec DK |
1519 | frames, NULL); |
1520 | if (retval < 0) { | |
b03a2f7e AD |
1521 | ext4_warning_inode(dir, |
1522 | "error %d reading directory index block", | |
1523 | retval); | |
537d8f93 | 1524 | bh = ERR_PTR(retval); |
ac27a0ec DK |
1525 | goto errout; |
1526 | } | |
1527 | } while (retval == 1); | |
1528 | ||
537d8f93 | 1529 | bh = NULL; |
ac27a0ec | 1530 | errout: |
d6b97550 | 1531 | dxtrace(printk(KERN_DEBUG "%s not found\n", fname->usr_fname->name)); |
537d8f93 TT |
1532 | success: |
1533 | dx_release(frames); | |
1534 | return bh; | |
ac27a0ec | 1535 | } |
ac27a0ec | 1536 | |
00cd8dd3 | 1537 | static struct dentry *ext4_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) |
ac27a0ec | 1538 | { |
af5bc92d TT |
1539 | struct inode *inode; |
1540 | struct ext4_dir_entry_2 *de; | |
1541 | struct buffer_head *bh; | |
ac27a0ec | 1542 | |
a7550b30 JK |
1543 | if (ext4_encrypted_inode(dir)) { |
1544 | int res = fscrypt_get_encryption_info(dir); | |
28b4c263 TT |
1545 | |
1546 | /* | |
a7550b30 | 1547 | * DCACHE_ENCRYPTED_WITH_KEY is set if the dentry is |
28b4c263 | 1548 | * created while the directory was encrypted and we |
a7550b30 | 1549 | * have access to the key. |
28b4c263 | 1550 | */ |
a7550b30 JK |
1551 | if (fscrypt_has_encryption_key(dir)) |
1552 | fscrypt_set_encrypted_dentry(dentry); | |
1553 | fscrypt_set_d_op(dentry); | |
1554 | if (res && res != -ENOKEY) | |
1555 | return ERR_PTR(res); | |
1556 | } | |
28b4c263 | 1557 | |
a7550b30 JK |
1558 | if (dentry->d_name.len > EXT4_NAME_LEN) |
1559 | return ERR_PTR(-ENAMETOOLONG); | |
ac27a0ec | 1560 | |
32f7f22c | 1561 | bh = ext4_find_entry(dir, &dentry->d_name, &de, NULL); |
36de9286 TT |
1562 | if (IS_ERR(bh)) |
1563 | return (struct dentry *) bh; | |
ac27a0ec DK |
1564 | inode = NULL; |
1565 | if (bh) { | |
498e5f24 | 1566 | __u32 ino = le32_to_cpu(de->inode); |
af5bc92d | 1567 | brelse(bh); |
617ba13b | 1568 | if (!ext4_valid_inum(dir->i_sb, ino)) { |
24676da4 | 1569 | EXT4_ERROR_INODE(dir, "bad inode number: %u", ino); |
6a797d27 | 1570 | return ERR_PTR(-EFSCORRUPTED); |
a6c15c2b | 1571 | } |
7e936b73 | 1572 | if (unlikely(ino == dir->i_ino)) { |
a34e15cc DH |
1573 | EXT4_ERROR_INODE(dir, "'%pd' linked to parent dir", |
1574 | dentry); | |
6a797d27 | 1575 | return ERR_PTR(-EFSCORRUPTED); |
7e936b73 | 1576 | } |
f4bb2981 | 1577 | inode = ext4_iget_normal(dir->i_sb, ino); |
a9049376 AV |
1578 | if (inode == ERR_PTR(-ESTALE)) { |
1579 | EXT4_ERROR_INODE(dir, | |
1580 | "deleted inode referenced: %u", | |
1581 | ino); | |
6a797d27 | 1582 | return ERR_PTR(-EFSCORRUPTED); |
e6f009b0 | 1583 | } |
d9cdc903 | 1584 | if (!IS_ERR(inode) && ext4_encrypted_inode(dir) && |
ff978b09 | 1585 | (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) && |
a7550b30 | 1586 | !fscrypt_has_permitted_context(dir, inode)) { |
d9cdc903 | 1587 | ext4_warning(inode->i_sb, |
8d2ae1cb | 1588 | "Inconsistent encryption contexts: %lu/%lu", |
8c68084b | 1589 | dir->i_ino, inode->i_ino); |
dd01b690 | 1590 | iput(inode); |
d9cdc903 TT |
1591 | return ERR_PTR(-EPERM); |
1592 | } | |
ac27a0ec DK |
1593 | } |
1594 | return d_splice_alias(inode, dentry); | |
1595 | } | |
1596 | ||
1597 | ||
617ba13b | 1598 | struct dentry *ext4_get_parent(struct dentry *child) |
ac27a0ec | 1599 | { |
498e5f24 | 1600 | __u32 ino; |
26fe5750 | 1601 | static const struct qstr dotdot = QSTR_INIT("..", 2); |
617ba13b | 1602 | struct ext4_dir_entry_2 * de; |
ac27a0ec DK |
1603 | struct buffer_head *bh; |
1604 | ||
2b0143b5 | 1605 | bh = ext4_find_entry(d_inode(child), &dotdot, &de, NULL); |
36de9286 TT |
1606 | if (IS_ERR(bh)) |
1607 | return (struct dentry *) bh; | |
ac27a0ec DK |
1608 | if (!bh) |
1609 | return ERR_PTR(-ENOENT); | |
1610 | ino = le32_to_cpu(de->inode); | |
1611 | brelse(bh); | |
1612 | ||
fc64005c | 1613 | if (!ext4_valid_inum(child->d_sb, ino)) { |
2b0143b5 | 1614 | EXT4_ERROR_INODE(d_inode(child), |
24676da4 | 1615 | "bad parent inode number: %u", ino); |
6a797d27 | 1616 | return ERR_PTR(-EFSCORRUPTED); |
a6c15c2b VA |
1617 | } |
1618 | ||
fc64005c | 1619 | return d_obtain_alias(ext4_iget_normal(child->d_sb, ino)); |
ac27a0ec DK |
1620 | } |
1621 | ||
ef2b02d3 ES |
1622 | /* |
1623 | * Move count entries from end of map between two memory locations. | |
1624 | * Returns pointer to last entry moved. | |
1625 | */ | |
617ba13b | 1626 | static struct ext4_dir_entry_2 * |
3d0518f4 WY |
1627 | dx_move_dirents(char *from, char *to, struct dx_map_entry *map, int count, |
1628 | unsigned blocksize) | |
ac27a0ec DK |
1629 | { |
1630 | unsigned rec_len = 0; | |
1631 | ||
1632 | while (count--) { | |
60e6679e | 1633 | struct ext4_dir_entry_2 *de = (struct ext4_dir_entry_2 *) |
9aee2286 | 1634 | (from + (map->offs<<2)); |
617ba13b | 1635 | rec_len = EXT4_DIR_REC_LEN(de->name_len); |
ac27a0ec | 1636 | memcpy (to, de, rec_len); |
617ba13b | 1637 | ((struct ext4_dir_entry_2 *) to)->rec_len = |
3d0518f4 | 1638 | ext4_rec_len_to_disk(rec_len, blocksize); |
ac27a0ec DK |
1639 | de->inode = 0; |
1640 | map++; | |
1641 | to += rec_len; | |
1642 | } | |
617ba13b | 1643 | return (struct ext4_dir_entry_2 *) (to - rec_len); |
ac27a0ec DK |
1644 | } |
1645 | ||
ef2b02d3 ES |
1646 | /* |
1647 | * Compact each dir entry in the range to the minimal rec_len. | |
1648 | * Returns pointer to last entry in range. | |
1649 | */ | |
8bad4597 | 1650 | static struct ext4_dir_entry_2* dx_pack_dirents(char *base, unsigned blocksize) |
ac27a0ec | 1651 | { |
617ba13b | 1652 | struct ext4_dir_entry_2 *next, *to, *prev, *de = (struct ext4_dir_entry_2 *) base; |
ac27a0ec DK |
1653 | unsigned rec_len = 0; |
1654 | ||
1655 | prev = to = de; | |
8bad4597 | 1656 | while ((char*)de < base + blocksize) { |
3d0518f4 | 1657 | next = ext4_next_entry(de, blocksize); |
ac27a0ec | 1658 | if (de->inode && de->name_len) { |
617ba13b | 1659 | rec_len = EXT4_DIR_REC_LEN(de->name_len); |
ac27a0ec DK |
1660 | if (de > to) |
1661 | memmove(to, de, rec_len); | |
3d0518f4 | 1662 | to->rec_len = ext4_rec_len_to_disk(rec_len, blocksize); |
ac27a0ec | 1663 | prev = to; |
617ba13b | 1664 | to = (struct ext4_dir_entry_2 *) (((char *) to) + rec_len); |
ac27a0ec DK |
1665 | } |
1666 | de = next; | |
1667 | } | |
1668 | return prev; | |
1669 | } | |
1670 | ||
ef2b02d3 ES |
1671 | /* |
1672 | * Split a full leaf block to make room for a new dir entry. | |
1673 | * Allocate a new block, and move entries so that they are approx. equally full. | |
1674 | * Returns pointer to de in block into which the new entry will be inserted. | |
1675 | */ | |
617ba13b | 1676 | static struct ext4_dir_entry_2 *do_split(handle_t *handle, struct inode *dir, |
ac27a0ec | 1677 | struct buffer_head **bh,struct dx_frame *frame, |
f8b3b59d | 1678 | struct dx_hash_info *hinfo) |
ac27a0ec DK |
1679 | { |
1680 | unsigned blocksize = dir->i_sb->s_blocksize; | |
1681 | unsigned count, continued; | |
1682 | struct buffer_head *bh2; | |
725d26d3 | 1683 | ext4_lblk_t newblock; |
ac27a0ec DK |
1684 | u32 hash2; |
1685 | struct dx_map_entry *map; | |
1686 | char *data1 = (*bh)->b_data, *data2; | |
59e315b4 | 1687 | unsigned split, move, size; |
617ba13b | 1688 | struct ext4_dir_entry_2 *de = NULL, *de2; |
b0336e8d DW |
1689 | struct ext4_dir_entry_tail *t; |
1690 | int csum_size = 0; | |
59e315b4 | 1691 | int err = 0, i; |
ac27a0ec | 1692 | |
9aa5d32b | 1693 | if (ext4_has_metadata_csum(dir->i_sb)) |
b0336e8d DW |
1694 | csum_size = sizeof(struct ext4_dir_entry_tail); |
1695 | ||
0f70b406 TT |
1696 | bh2 = ext4_append(handle, dir, &newblock); |
1697 | if (IS_ERR(bh2)) { | |
ac27a0ec DK |
1698 | brelse(*bh); |
1699 | *bh = NULL; | |
f8b3b59d | 1700 | return (struct ext4_dir_entry_2 *) bh2; |
ac27a0ec DK |
1701 | } |
1702 | ||
1703 | BUFFER_TRACE(*bh, "get_write_access"); | |
617ba13b | 1704 | err = ext4_journal_get_write_access(handle, *bh); |
fedee54d DM |
1705 | if (err) |
1706 | goto journal_error; | |
1707 | ||
ac27a0ec | 1708 | BUFFER_TRACE(frame->bh, "get_write_access"); |
617ba13b | 1709 | err = ext4_journal_get_write_access(handle, frame->bh); |
ac27a0ec DK |
1710 | if (err) |
1711 | goto journal_error; | |
1712 | ||
1713 | data2 = bh2->b_data; | |
1714 | ||
1715 | /* create map in the end of data2 block */ | |
1716 | map = (struct dx_map_entry *) (data2 + blocksize); | |
1f3862b5 | 1717 | count = dx_make_map(dir, (struct ext4_dir_entry_2 *) data1, |
ac27a0ec DK |
1718 | blocksize, hinfo, map); |
1719 | map -= count; | |
af5bc92d | 1720 | dx_sort_map(map, count); |
ef2b02d3 ES |
1721 | /* Split the existing block in the middle, size-wise */ |
1722 | size = 0; | |
1723 | move = 0; | |
1724 | for (i = count-1; i >= 0; i--) { | |
1725 | /* is more than half of this entry in 2nd half of the block? */ | |
1726 | if (size + map[i].size/2 > blocksize/2) | |
1727 | break; | |
1728 | size += map[i].size; | |
1729 | move++; | |
1730 | } | |
1731 | /* map index at which we will split */ | |
1732 | split = count - move; | |
ac27a0ec DK |
1733 | hash2 = map[split].hash; |
1734 | continued = hash2 == map[split - 1].hash; | |
725d26d3 AK |
1735 | dxtrace(printk(KERN_INFO "Split block %lu at %x, %i/%i\n", |
1736 | (unsigned long)dx_get_block(frame->at), | |
1737 | hash2, split, count-split)); | |
ac27a0ec DK |
1738 | |
1739 | /* Fancy dance to stay within two buffers */ | |
1f3862b5 MH |
1740 | de2 = dx_move_dirents(data1, data2, map + split, count - split, |
1741 | blocksize); | |
af5bc92d | 1742 | de = dx_pack_dirents(data1, blocksize); |
b0336e8d DW |
1743 | de->rec_len = ext4_rec_len_to_disk(data1 + (blocksize - csum_size) - |
1744 | (char *) de, | |
3d0518f4 | 1745 | blocksize); |
b0336e8d DW |
1746 | de2->rec_len = ext4_rec_len_to_disk(data2 + (blocksize - csum_size) - |
1747 | (char *) de2, | |
3d0518f4 | 1748 | blocksize); |
b0336e8d DW |
1749 | if (csum_size) { |
1750 | t = EXT4_DIRENT_TAIL(data2, blocksize); | |
1751 | initialize_dirent_tail(t, blocksize); | |
1752 | ||
1753 | t = EXT4_DIRENT_TAIL(data1, blocksize); | |
1754 | initialize_dirent_tail(t, blocksize); | |
1755 | } | |
1756 | ||
b3098486 MH |
1757 | dxtrace(dx_show_leaf(dir, hinfo, (struct ext4_dir_entry_2 *) data1, |
1758 | blocksize, 1)); | |
1759 | dxtrace(dx_show_leaf(dir, hinfo, (struct ext4_dir_entry_2 *) data2, | |
1760 | blocksize, 1)); | |
ac27a0ec DK |
1761 | |
1762 | /* Which block gets the new entry? */ | |
f8b3b59d | 1763 | if (hinfo->hash >= hash2) { |
ac27a0ec DK |
1764 | swap(*bh, bh2); |
1765 | de = de2; | |
1766 | } | |
af5bc92d | 1767 | dx_insert_block(frame, hash2 + continued, newblock); |
b0336e8d | 1768 | err = ext4_handle_dirty_dirent_node(handle, dir, bh2); |
ac27a0ec DK |
1769 | if (err) |
1770 | goto journal_error; | |
dbe89444 | 1771 | err = ext4_handle_dirty_dx_node(handle, dir, frame->bh); |
ac27a0ec DK |
1772 | if (err) |
1773 | goto journal_error; | |
af5bc92d TT |
1774 | brelse(bh2); |
1775 | dxtrace(dx_show_index("frame", frame->entries)); | |
ac27a0ec | 1776 | return de; |
fedee54d DM |
1777 | |
1778 | journal_error: | |
1779 | brelse(*bh); | |
1780 | brelse(bh2); | |
1781 | *bh = NULL; | |
1782 | ext4_std_error(dir->i_sb, err); | |
f8b3b59d | 1783 | return ERR_PTR(err); |
ac27a0ec | 1784 | } |
ac27a0ec | 1785 | |
978fef91 TM |
1786 | int ext4_find_dest_de(struct inode *dir, struct inode *inode, |
1787 | struct buffer_head *bh, | |
1788 | void *buf, int buf_size, | |
5b643f9c | 1789 | struct ext4_filename *fname, |
978fef91 TM |
1790 | struct ext4_dir_entry_2 **dest_de) |
1791 | { | |
1792 | struct ext4_dir_entry_2 *de; | |
5b643f9c | 1793 | unsigned short reclen = EXT4_DIR_REC_LEN(fname_len(fname)); |
978fef91 TM |
1794 | int nlen, rlen; |
1795 | unsigned int offset = 0; | |
1796 | char *top; | |
1f3862b5 | 1797 | |
978fef91 TM |
1798 | de = (struct ext4_dir_entry_2 *)buf; |
1799 | top = buf + buf_size - reclen; | |
1800 | while ((char *) de <= top) { | |
1801 | if (ext4_check_dir_entry(dir, NULL, de, bh, | |
d9b9f8d5 EB |
1802 | buf, buf_size, offset)) |
1803 | return -EFSCORRUPTED; | |
1804 | if (ext4_match(fname, de)) | |
1805 | return -EEXIST; | |
978fef91 TM |
1806 | nlen = EXT4_DIR_REC_LEN(de->name_len); |
1807 | rlen = ext4_rec_len_from_disk(de->rec_len, buf_size); | |
1808 | if ((de->inode ? rlen - nlen : rlen) >= reclen) | |
1809 | break; | |
1810 | de = (struct ext4_dir_entry_2 *)((char *)de + rlen); | |
1811 | offset += rlen; | |
1812 | } | |
1f3862b5 | 1813 | if ((char *) de > top) |
d9b9f8d5 EB |
1814 | return -ENOSPC; |
1815 | ||
1816 | *dest_de = de; | |
1817 | return 0; | |
978fef91 TM |
1818 | } |
1819 | ||
1bc0af60 EB |
1820 | void ext4_insert_dentry(struct inode *inode, |
1821 | struct ext4_dir_entry_2 *de, | |
1822 | int buf_size, | |
1823 | struct ext4_filename *fname) | |
978fef91 TM |
1824 | { |
1825 | ||
1826 | int nlen, rlen; | |
1827 | ||
1828 | nlen = EXT4_DIR_REC_LEN(de->name_len); | |
1829 | rlen = ext4_rec_len_from_disk(de->rec_len, buf_size); | |
1830 | if (de->inode) { | |
1831 | struct ext4_dir_entry_2 *de1 = | |
4bdfc873 | 1832 | (struct ext4_dir_entry_2 *)((char *)de + nlen); |
978fef91 TM |
1833 | de1->rec_len = ext4_rec_len_to_disk(rlen - nlen, buf_size); |
1834 | de->rec_len = ext4_rec_len_to_disk(nlen, buf_size); | |
1835 | de = de1; | |
1836 | } | |
1837 | de->file_type = EXT4_FT_UNKNOWN; | |
1838 | de->inode = cpu_to_le32(inode->i_ino); | |
1839 | ext4_set_de_type(inode->i_sb, de, inode->i_mode); | |
5b643f9c TT |
1840 | de->name_len = fname_len(fname); |
1841 | memcpy(de->name, fname_name(fname), fname_len(fname)); | |
978fef91 | 1842 | } |
4bdfc873 | 1843 | |
ac27a0ec DK |
1844 | /* |
1845 | * Add a new entry into a directory (leaf) block. If de is non-NULL, | |
1846 | * it points to a directory entry which is guaranteed to be large | |
1847 | * enough for new directory entry. If de is NULL, then | |
1848 | * add_dirent_to_buf will attempt search the directory block for | |
1849 | * space. It will return -ENOSPC if no space is available, and -EIO | |
1850 | * and -EEXIST if directory entry already exists. | |
ac27a0ec | 1851 | */ |
5b643f9c TT |
1852 | static int add_dirent_to_buf(handle_t *handle, struct ext4_filename *fname, |
1853 | struct inode *dir, | |
617ba13b | 1854 | struct inode *inode, struct ext4_dir_entry_2 *de, |
af5bc92d | 1855 | struct buffer_head *bh) |
ac27a0ec | 1856 | { |
3d0518f4 | 1857 | unsigned int blocksize = dir->i_sb->s_blocksize; |
b0336e8d | 1858 | int csum_size = 0; |
978fef91 | 1859 | int err; |
b0336e8d | 1860 | |
9aa5d32b | 1861 | if (ext4_has_metadata_csum(inode->i_sb)) |
b0336e8d | 1862 | csum_size = sizeof(struct ext4_dir_entry_tail); |
ac27a0ec | 1863 | |
ac27a0ec | 1864 | if (!de) { |
5b643f9c TT |
1865 | err = ext4_find_dest_de(dir, inode, bh, bh->b_data, |
1866 | blocksize - csum_size, fname, &de); | |
978fef91 TM |
1867 | if (err) |
1868 | return err; | |
ac27a0ec DK |
1869 | } |
1870 | BUFFER_TRACE(bh, "get_write_access"); | |
617ba13b | 1871 | err = ext4_journal_get_write_access(handle, bh); |
ac27a0ec | 1872 | if (err) { |
617ba13b | 1873 | ext4_std_error(dir->i_sb, err); |
ac27a0ec DK |
1874 | return err; |
1875 | } | |
1876 | ||
1bc0af60 EB |
1877 | /* By now the buffer is marked for journaling */ |
1878 | ext4_insert_dentry(inode, de, blocksize, fname); | |
978fef91 | 1879 | |
ac27a0ec DK |
1880 | /* |
1881 | * XXX shouldn't update any times until successful | |
1882 | * completion of syscall, but too many callers depend | |
1883 | * on this. | |
1884 | * | |
1885 | * XXX similarly, too many callers depend on | |
617ba13b | 1886 | * ext4_new_inode() setting the times, but error |
ac27a0ec DK |
1887 | * recovery deletes the inode, so the worst that can |
1888 | * happen is that the times are slightly out of date | |
1889 | * and/or different from the directory change time. | |
1890 | */ | |
eeca7ea1 | 1891 | dir->i_mtime = dir->i_ctime = current_time(dir); |
617ba13b | 1892 | ext4_update_dx_flag(dir); |
e08ac99f | 1893 | inode_inc_iversion(dir); |
617ba13b | 1894 | ext4_mark_inode_dirty(handle, dir); |
0390131b | 1895 | BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata"); |
b0336e8d | 1896 | err = ext4_handle_dirty_dirent_node(handle, dir, bh); |
ac27a0ec | 1897 | if (err) |
617ba13b | 1898 | ext4_std_error(dir->i_sb, err); |
ac27a0ec DK |
1899 | return 0; |
1900 | } | |
1901 | ||
ac27a0ec DK |
1902 | /* |
1903 | * This converts a one block unindexed directory to a 3 block indexed | |
1904 | * directory, and adds the dentry to the indexed directory. | |
1905 | */ | |
5b643f9c | 1906 | static int make_indexed_dir(handle_t *handle, struct ext4_filename *fname, |
56a04915 | 1907 | struct inode *dir, |
ac27a0ec DK |
1908 | struct inode *inode, struct buffer_head *bh) |
1909 | { | |
ac27a0ec DK |
1910 | struct buffer_head *bh2; |
1911 | struct dx_root *root; | |
e08ac99f | 1912 | struct dx_frame frames[EXT4_HTREE_LEVEL], *frame; |
ac27a0ec | 1913 | struct dx_entry *entries; |
617ba13b | 1914 | struct ext4_dir_entry_2 *de, *de2; |
b0336e8d | 1915 | struct ext4_dir_entry_tail *t; |
ac27a0ec DK |
1916 | char *data1, *top; |
1917 | unsigned len; | |
1918 | int retval; | |
1919 | unsigned blocksize; | |
725d26d3 | 1920 | ext4_lblk_t block; |
ac27a0ec | 1921 | struct fake_dirent *fde; |
4bdfc873 MH |
1922 | int csum_size = 0; |
1923 | ||
9aa5d32b | 1924 | if (ext4_has_metadata_csum(inode->i_sb)) |
b0336e8d | 1925 | csum_size = sizeof(struct ext4_dir_entry_tail); |
ac27a0ec DK |
1926 | |
1927 | blocksize = dir->i_sb->s_blocksize; | |
e6b8bc09 | 1928 | dxtrace(printk(KERN_DEBUG "Creating index: inode %lu\n", dir->i_ino)); |
5d601255 | 1929 | BUFFER_TRACE(bh, "get_write_access"); |
617ba13b | 1930 | retval = ext4_journal_get_write_access(handle, bh); |
ac27a0ec | 1931 | if (retval) { |
617ba13b | 1932 | ext4_std_error(dir->i_sb, retval); |
ac27a0ec DK |
1933 | brelse(bh); |
1934 | return retval; | |
1935 | } | |
1936 | root = (struct dx_root *) bh->b_data; | |
1937 | ||
e6b8bc09 TT |
1938 | /* The 0th block becomes the root, move the dirents out */ |
1939 | fde = &root->dotdot; | |
1940 | de = (struct ext4_dir_entry_2 *)((char *)fde + | |
3d0518f4 | 1941 | ext4_rec_len_from_disk(fde->rec_len, blocksize)); |
e6b8bc09 | 1942 | if ((char *) de >= (((char *) root) + blocksize)) { |
24676da4 | 1943 | EXT4_ERROR_INODE(dir, "invalid rec_len for '..'"); |
e6b8bc09 | 1944 | brelse(bh); |
6a797d27 | 1945 | return -EFSCORRUPTED; |
e6b8bc09 | 1946 | } |
b0336e8d | 1947 | len = ((char *) root) + (blocksize - csum_size) - (char *) de; |
e6b8bc09 TT |
1948 | |
1949 | /* Allocate new block for the 0th block's dirents */ | |
0f70b406 TT |
1950 | bh2 = ext4_append(handle, dir, &block); |
1951 | if (IS_ERR(bh2)) { | |
ac27a0ec | 1952 | brelse(bh); |
0f70b406 | 1953 | return PTR_ERR(bh2); |
ac27a0ec | 1954 | } |
12e9b892 | 1955 | ext4_set_inode_flag(dir, EXT4_INODE_INDEX); |
ac27a0ec DK |
1956 | data1 = bh2->b_data; |
1957 | ||
ac27a0ec | 1958 | memcpy (data1, de, len); |
617ba13b | 1959 | de = (struct ext4_dir_entry_2 *) data1; |
ac27a0ec | 1960 | top = data1 + len; |
3d0518f4 | 1961 | while ((char *)(de2 = ext4_next_entry(de, blocksize)) < top) |
ac27a0ec | 1962 | de = de2; |
b0336e8d DW |
1963 | de->rec_len = ext4_rec_len_to_disk(data1 + (blocksize - csum_size) - |
1964 | (char *) de, | |
3d0518f4 | 1965 | blocksize); |
b0336e8d DW |
1966 | |
1967 | if (csum_size) { | |
1968 | t = EXT4_DIRENT_TAIL(data1, blocksize); | |
1969 | initialize_dirent_tail(t, blocksize); | |
1970 | } | |
1971 | ||
ac27a0ec | 1972 | /* Initialize the root; the dot dirents already exist */ |
617ba13b | 1973 | de = (struct ext4_dir_entry_2 *) (&root->dotdot); |
3d0518f4 WY |
1974 | de->rec_len = ext4_rec_len_to_disk(blocksize - EXT4_DIR_REC_LEN(2), |
1975 | blocksize); | |
ac27a0ec DK |
1976 | memset (&root->info, 0, sizeof(root->info)); |
1977 | root->info.info_length = sizeof(root->info); | |
617ba13b | 1978 | root->info.hash_version = EXT4_SB(dir->i_sb)->s_def_hash_version; |
ac27a0ec | 1979 | entries = root->entries; |
af5bc92d TT |
1980 | dx_set_block(entries, 1); |
1981 | dx_set_count(entries, 1); | |
1982 | dx_set_limit(entries, dx_root_limit(dir, sizeof(root->info))); | |
ac27a0ec DK |
1983 | |
1984 | /* Initialize as for dx_probe */ | |
5b643f9c TT |
1985 | fname->hinfo.hash_version = root->info.hash_version; |
1986 | if (fname->hinfo.hash_version <= DX_HASH_TEA) | |
1987 | fname->hinfo.hash_version += EXT4_SB(dir->i_sb)->s_hash_unsigned; | |
1988 | fname->hinfo.seed = EXT4_SB(dir->i_sb)->s_hash_seed; | |
1989 | ext4fs_dirhash(fname_name(fname), fname_len(fname), &fname->hinfo); | |
1990 | ||
6050d47a | 1991 | memset(frames, 0, sizeof(frames)); |
ac27a0ec DK |
1992 | frame = frames; |
1993 | frame->entries = entries; | |
1994 | frame->at = entries; | |
1995 | frame->bh = bh; | |
6976a6f2 | 1996 | |
6050d47a JK |
1997 | retval = ext4_handle_dirty_dx_node(handle, dir, frame->bh); |
1998 | if (retval) | |
1999 | goto out_frames; | |
e81d4477 | 2000 | retval = ext4_handle_dirty_dirent_node(handle, dir, bh2); |
6050d47a JK |
2001 | if (retval) |
2002 | goto out_frames; | |
6976a6f2 | 2003 | |
e81d4477 | 2004 | de = do_split(handle,dir, &bh2, frame, &fname->hinfo); |
f8b3b59d | 2005 | if (IS_ERR(de)) { |
6050d47a JK |
2006 | retval = PTR_ERR(de); |
2007 | goto out_frames; | |
7ad8e4e6 | 2008 | } |
ac27a0ec | 2009 | |
e81d4477 | 2010 | retval = add_dirent_to_buf(handle, fname, dir, inode, de, bh2); |
6050d47a JK |
2011 | out_frames: |
2012 | /* | |
2013 | * Even if the block split failed, we have to properly write | |
2014 | * out all the changes we did so far. Otherwise we can end up | |
2015 | * with corrupted filesystem. | |
2016 | */ | |
e81d4477 | 2017 | if (retval) |
2018 | ext4_mark_inode_dirty(handle, dir); | |
6050d47a | 2019 | dx_release(frames); |
e81d4477 | 2020 | brelse(bh2); |
6050d47a | 2021 | return retval; |
ac27a0ec | 2022 | } |
ac27a0ec DK |
2023 | |
2024 | /* | |
617ba13b | 2025 | * ext4_add_entry() |
ac27a0ec DK |
2026 | * |
2027 | * adds a file entry to the specified directory, using the same | |
617ba13b | 2028 | * semantics as ext4_find_entry(). It returns NULL if it failed. |
ac27a0ec DK |
2029 | * |
2030 | * NOTE!! The inode part of 'de' is left at 0 - which means you | |
2031 | * may not sleep between calling this and putting something into | |
2032 | * the entry, as someone else might have used it while you slept. | |
2033 | */ | |
af5bc92d TT |
2034 | static int ext4_add_entry(handle_t *handle, struct dentry *dentry, |
2035 | struct inode *inode) | |
ac27a0ec | 2036 | { |
2b0143b5 | 2037 | struct inode *dir = d_inode(dentry->d_parent); |
e12fb972 | 2038 | struct buffer_head *bh = NULL; |
617ba13b | 2039 | struct ext4_dir_entry_2 *de; |
b0336e8d | 2040 | struct ext4_dir_entry_tail *t; |
af5bc92d | 2041 | struct super_block *sb; |
5b643f9c | 2042 | struct ext4_filename fname; |
ac27a0ec | 2043 | int retval; |
ac27a0ec | 2044 | int dx_fallback=0; |
ac27a0ec | 2045 | unsigned blocksize; |
725d26d3 | 2046 | ext4_lblk_t block, blocks; |
b0336e8d DW |
2047 | int csum_size = 0; |
2048 | ||
9aa5d32b | 2049 | if (ext4_has_metadata_csum(inode->i_sb)) |
b0336e8d | 2050 | csum_size = sizeof(struct ext4_dir_entry_tail); |
ac27a0ec DK |
2051 | |
2052 | sb = dir->i_sb; | |
2053 | blocksize = sb->s_blocksize; | |
2054 | if (!dentry->d_name.len) | |
2055 | return -EINVAL; | |
3c47d541 | 2056 | |
5b643f9c TT |
2057 | retval = ext4_fname_setup_filename(dir, &dentry->d_name, 0, &fname); |
2058 | if (retval) | |
2059 | return retval; | |
2060 | ||
3c47d541 | 2061 | if (ext4_has_inline_data(dir)) { |
56a04915 | 2062 | retval = ext4_try_add_inline_entry(handle, &fname, dir, inode); |
3c47d541 | 2063 | if (retval < 0) |
5b643f9c | 2064 | goto out; |
3c47d541 TM |
2065 | if (retval == 1) { |
2066 | retval = 0; | |
e12fb972 | 2067 | goto out; |
3c47d541 TM |
2068 | } |
2069 | } | |
2070 | ||
ac27a0ec | 2071 | if (is_dx(dir)) { |
56a04915 | 2072 | retval = ext4_dx_add_entry(handle, &fname, dir, inode); |
ac27a0ec | 2073 | if (!retval || (retval != ERR_BAD_DX_DIR)) |
e12fb972 | 2074 | goto out; |
12e9b892 | 2075 | ext4_clear_inode_flag(dir, EXT4_INODE_INDEX); |
ac27a0ec | 2076 | dx_fallback++; |
617ba13b | 2077 | ext4_mark_inode_dirty(handle, dir); |
ac27a0ec | 2078 | } |
ac27a0ec | 2079 | blocks = dir->i_size >> sb->s_blocksize_bits; |
498e5f24 | 2080 | for (block = 0; block < blocks; block++) { |
dc6982ff | 2081 | bh = ext4_read_dirblock(dir, block, DIRENT); |
5b643f9c TT |
2082 | if (IS_ERR(bh)) { |
2083 | retval = PTR_ERR(bh); | |
2084 | bh = NULL; | |
2085 | goto out; | |
2086 | } | |
2087 | retval = add_dirent_to_buf(handle, &fname, dir, inode, | |
2088 | NULL, bh); | |
e12fb972 LC |
2089 | if (retval != -ENOSPC) |
2090 | goto out; | |
ac27a0ec | 2091 | |
ac27a0ec | 2092 | if (blocks == 1 && !dx_fallback && |
e2b911c5 | 2093 | ext4_has_feature_dir_index(sb)) { |
56a04915 | 2094 | retval = make_indexed_dir(handle, &fname, dir, |
5b643f9c | 2095 | inode, bh); |
e12fb972 LC |
2096 | bh = NULL; /* make_indexed_dir releases bh */ |
2097 | goto out; | |
2098 | } | |
ac27a0ec DK |
2099 | brelse(bh); |
2100 | } | |
0f70b406 | 2101 | bh = ext4_append(handle, dir, &block); |
5b643f9c TT |
2102 | if (IS_ERR(bh)) { |
2103 | retval = PTR_ERR(bh); | |
2104 | bh = NULL; | |
2105 | goto out; | |
2106 | } | |
617ba13b | 2107 | de = (struct ext4_dir_entry_2 *) bh->b_data; |
ac27a0ec | 2108 | de->inode = 0; |
b0336e8d DW |
2109 | de->rec_len = ext4_rec_len_to_disk(blocksize - csum_size, blocksize); |
2110 | ||
2111 | if (csum_size) { | |
2112 | t = EXT4_DIRENT_TAIL(bh->b_data, blocksize); | |
2113 | initialize_dirent_tail(t, blocksize); | |
2114 | } | |
2115 | ||
5b643f9c | 2116 | retval = add_dirent_to_buf(handle, &fname, dir, inode, de, bh); |
e12fb972 | 2117 | out: |
5b643f9c | 2118 | ext4_fname_free_filename(&fname); |
2de770a4 | 2119 | brelse(bh); |
14ece102 FM |
2120 | if (retval == 0) |
2121 | ext4_set_inode_state(inode, EXT4_STATE_NEWENTRY); | |
2de770a4 | 2122 | return retval; |
ac27a0ec DK |
2123 | } |
2124 | ||
ac27a0ec DK |
2125 | /* |
2126 | * Returns 0 for success, or a negative error value | |
2127 | */ | |
5b643f9c | 2128 | static int ext4_dx_add_entry(handle_t *handle, struct ext4_filename *fname, |
56a04915 | 2129 | struct inode *dir, struct inode *inode) |
ac27a0ec | 2130 | { |
e08ac99f | 2131 | struct dx_frame frames[EXT4_HTREE_LEVEL], *frame; |
ac27a0ec | 2132 | struct dx_entry *entries, *at; |
af5bc92d | 2133 | struct buffer_head *bh; |
af5bc92d | 2134 | struct super_block *sb = dir->i_sb; |
617ba13b | 2135 | struct ext4_dir_entry_2 *de; |
e08ac99f | 2136 | int restart; |
ac27a0ec DK |
2137 | int err; |
2138 | ||
e08ac99f AB |
2139 | again: |
2140 | restart = 0; | |
5b643f9c | 2141 | frame = dx_probe(fname, dir, NULL, frames); |
dd73b5d5 TT |
2142 | if (IS_ERR(frame)) |
2143 | return PTR_ERR(frame); | |
ac27a0ec DK |
2144 | entries = frame->entries; |
2145 | at = frame->at; | |
dc6982ff TT |
2146 | bh = ext4_read_dirblock(dir, dx_get_block(frame->at), DIRENT); |
2147 | if (IS_ERR(bh)) { | |
2148 | err = PTR_ERR(bh); | |
2149 | bh = NULL; | |
ac27a0ec | 2150 | goto cleanup; |
6d1ab10e | 2151 | } |
ac27a0ec DK |
2152 | |
2153 | BUFFER_TRACE(bh, "get_write_access"); | |
617ba13b | 2154 | err = ext4_journal_get_write_access(handle, bh); |
ac27a0ec DK |
2155 | if (err) |
2156 | goto journal_error; | |
2157 | ||
5b643f9c | 2158 | err = add_dirent_to_buf(handle, fname, dir, inode, NULL, bh); |
2de770a4 | 2159 | if (err != -ENOSPC) |
ac27a0ec | 2160 | goto cleanup; |
ac27a0ec | 2161 | |
e08ac99f | 2162 | err = 0; |
ac27a0ec | 2163 | /* Block full, should compress but for now just split */ |
4776004f | 2164 | dxtrace(printk(KERN_DEBUG "using %u of %u node entries\n", |
ac27a0ec DK |
2165 | dx_get_count(entries), dx_get_limit(entries))); |
2166 | /* Need to split index? */ | |
2167 | if (dx_get_count(entries) == dx_get_limit(entries)) { | |
725d26d3 | 2168 | ext4_lblk_t newblock; |
e08ac99f AB |
2169 | int levels = frame - frames + 1; |
2170 | unsigned int icount; | |
2171 | int add_level = 1; | |
ac27a0ec DK |
2172 | struct dx_entry *entries2; |
2173 | struct dx_node *node2; | |
2174 | struct buffer_head *bh2; | |
2175 | ||
e08ac99f AB |
2176 | while (frame > frames) { |
2177 | if (dx_get_count((frame - 1)->entries) < | |
2178 | dx_get_limit((frame - 1)->entries)) { | |
2179 | add_level = 0; | |
2180 | break; | |
2181 | } | |
2182 | frame--; /* split higher index block */ | |
2183 | at = frame->at; | |
2184 | entries = frame->entries; | |
2185 | restart = 1; | |
2186 | } | |
2187 | if (add_level && levels == ext4_dir_htree_level(sb)) { | |
2188 | ext4_warning(sb, "Directory (ino: %lu) index full, " | |
2189 | "reach max htree level :%d", | |
2190 | dir->i_ino, levels); | |
2191 | if (ext4_dir_htree_level(sb) < EXT4_HTREE_LEVEL) { | |
2192 | ext4_warning(sb, "Large directory feature is " | |
2193 | "not enabled on this " | |
2194 | "filesystem"); | |
2195 | } | |
ac27a0ec DK |
2196 | err = -ENOSPC; |
2197 | goto cleanup; | |
2198 | } | |
e08ac99f | 2199 | icount = dx_get_count(entries); |
0f70b406 TT |
2200 | bh2 = ext4_append(handle, dir, &newblock); |
2201 | if (IS_ERR(bh2)) { | |
2202 | err = PTR_ERR(bh2); | |
ac27a0ec | 2203 | goto cleanup; |
0f70b406 | 2204 | } |
ac27a0ec DK |
2205 | node2 = (struct dx_node *)(bh2->b_data); |
2206 | entries2 = node2->entries; | |
1f7bebb9 | 2207 | memset(&node2->fake, 0, sizeof(struct fake_dirent)); |
3d0518f4 WY |
2208 | node2->fake.rec_len = ext4_rec_len_to_disk(sb->s_blocksize, |
2209 | sb->s_blocksize); | |
ac27a0ec | 2210 | BUFFER_TRACE(frame->bh, "get_write_access"); |
617ba13b | 2211 | err = ext4_journal_get_write_access(handle, frame->bh); |
ac27a0ec DK |
2212 | if (err) |
2213 | goto journal_error; | |
e08ac99f | 2214 | if (!add_level) { |
ac27a0ec DK |
2215 | unsigned icount1 = icount/2, icount2 = icount - icount1; |
2216 | unsigned hash2 = dx_get_hash(entries + icount1); | |
4776004f TT |
2217 | dxtrace(printk(KERN_DEBUG "Split index %i/%i\n", |
2218 | icount1, icount2)); | |
ac27a0ec DK |
2219 | |
2220 | BUFFER_TRACE(frame->bh, "get_write_access"); /* index root */ | |
617ba13b | 2221 | err = ext4_journal_get_write_access(handle, |
e08ac99f | 2222 | (frame - 1)->bh); |
ac27a0ec DK |
2223 | if (err) |
2224 | goto journal_error; | |
2225 | ||
af5bc92d TT |
2226 | memcpy((char *) entries2, (char *) (entries + icount1), |
2227 | icount2 * sizeof(struct dx_entry)); | |
2228 | dx_set_count(entries, icount1); | |
2229 | dx_set_count(entries2, icount2); | |
2230 | dx_set_limit(entries2, dx_node_limit(dir)); | |
ac27a0ec DK |
2231 | |
2232 | /* Which index block gets the new entry? */ | |
2233 | if (at - entries >= icount1) { | |
2234 | frame->at = at = at - entries - icount1 + entries2; | |
2235 | frame->entries = entries = entries2; | |
2236 | swap(frame->bh, bh2); | |
2237 | } | |
e08ac99f AB |
2238 | dx_insert_block((frame - 1), hash2, newblock); |
2239 | dxtrace(dx_show_index("node", frame->entries)); | |
af5bc92d | 2240 | dxtrace(dx_show_index("node", |
ac27a0ec | 2241 | ((struct dx_node *) bh2->b_data)->entries)); |
dbe89444 | 2242 | err = ext4_handle_dirty_dx_node(handle, dir, bh2); |
ac27a0ec DK |
2243 | if (err) |
2244 | goto journal_error; | |
2245 | brelse (bh2); | |
e08ac99f AB |
2246 | err = ext4_handle_dirty_dx_node(handle, dir, |
2247 | (frame - 1)->bh); | |
2248 | if (err) | |
2249 | goto journal_error; | |
2250 | if (restart) { | |
2251 | err = ext4_handle_dirty_dx_node(handle, dir, | |
2252 | frame->bh); | |
2253 | goto journal_error; | |
2254 | } | |
ac27a0ec | 2255 | } else { |
e08ac99f | 2256 | struct dx_root *dxroot; |
ac27a0ec DK |
2257 | memcpy((char *) entries2, (char *) entries, |
2258 | icount * sizeof(struct dx_entry)); | |
2259 | dx_set_limit(entries2, dx_node_limit(dir)); | |
2260 | ||
2261 | /* Set up root */ | |
2262 | dx_set_count(entries, 1); | |
2263 | dx_set_block(entries + 0, newblock); | |
e08ac99f AB |
2264 | dxroot = (struct dx_root *)frames[0].bh->b_data; |
2265 | dxroot->info.indirect_levels += 1; | |
2266 | dxtrace(printk(KERN_DEBUG | |
2267 | "Creating %d level index...\n", | |
2268 | info->indirect_levels)); | |
2269 | err = ext4_handle_dirty_dx_node(handle, dir, frame->bh); | |
ac27a0ec DK |
2270 | if (err) |
2271 | goto journal_error; | |
e08ac99f AB |
2272 | err = ext4_handle_dirty_dx_node(handle, dir, bh2); |
2273 | brelse(bh2); | |
2274 | restart = 1; | |
2275 | goto journal_error; | |
b4097142 | 2276 | } |
ac27a0ec | 2277 | } |
5b643f9c | 2278 | de = do_split(handle, dir, &bh, frame, &fname->hinfo); |
f8b3b59d TT |
2279 | if (IS_ERR(de)) { |
2280 | err = PTR_ERR(de); | |
ac27a0ec | 2281 | goto cleanup; |
f8b3b59d | 2282 | } |
5b643f9c | 2283 | err = add_dirent_to_buf(handle, fname, dir, inode, de, bh); |
ac27a0ec DK |
2284 | goto cleanup; |
2285 | ||
2286 | journal_error: | |
e08ac99f | 2287 | ext4_std_error(dir->i_sb, err); /* this is a no-op if err == 0 */ |
ac27a0ec | 2288 | cleanup: |
b1deefc9 | 2289 | brelse(bh); |
ac27a0ec | 2290 | dx_release(frames); |
e08ac99f AB |
2291 | /* @restart is true means htree-path has been changed, we need to |
2292 | * repeat dx_probe() to find out valid htree-path | |
2293 | */ | |
2294 | if (restart && err == 0) | |
2295 | goto again; | |
ac27a0ec DK |
2296 | return err; |
2297 | } | |
ac27a0ec DK |
2298 | |
2299 | /* | |
05019a9e TM |
2300 | * ext4_generic_delete_entry deletes a directory entry by merging it |
2301 | * with the previous entry | |
ac27a0ec | 2302 | */ |
05019a9e TM |
2303 | int ext4_generic_delete_entry(handle_t *handle, |
2304 | struct inode *dir, | |
2305 | struct ext4_dir_entry_2 *de_del, | |
2306 | struct buffer_head *bh, | |
2307 | void *entry_buf, | |
2308 | int buf_size, | |
2309 | int csum_size) | |
ac27a0ec | 2310 | { |
af5bc92d | 2311 | struct ext4_dir_entry_2 *de, *pde; |
3d0518f4 | 2312 | unsigned int blocksize = dir->i_sb->s_blocksize; |
05019a9e | 2313 | int i; |
b0336e8d | 2314 | |
ac27a0ec DK |
2315 | i = 0; |
2316 | pde = NULL; | |
05019a9e TM |
2317 | de = (struct ext4_dir_entry_2 *)entry_buf; |
2318 | while (i < buf_size - csum_size) { | |
226ba972 TM |
2319 | if (ext4_check_dir_entry(dir, NULL, de, bh, |
2320 | bh->b_data, bh->b_size, i)) | |
6a797d27 | 2321 | return -EFSCORRUPTED; |
ac27a0ec | 2322 | if (de == de_del) { |
ac27a0ec | 2323 | if (pde) |
a72d7f83 | 2324 | pde->rec_len = ext4_rec_len_to_disk( |
3d0518f4 WY |
2325 | ext4_rec_len_from_disk(pde->rec_len, |
2326 | blocksize) + | |
2327 | ext4_rec_len_from_disk(de->rec_len, | |
2328 | blocksize), | |
2329 | blocksize); | |
ac27a0ec DK |
2330 | else |
2331 | de->inode = 0; | |
e08ac99f | 2332 | inode_inc_iversion(dir); |
ac27a0ec DK |
2333 | return 0; |
2334 | } | |
3d0518f4 | 2335 | i += ext4_rec_len_from_disk(de->rec_len, blocksize); |
ac27a0ec | 2336 | pde = de; |
3d0518f4 | 2337 | de = ext4_next_entry(de, blocksize); |
ac27a0ec DK |
2338 | } |
2339 | return -ENOENT; | |
2340 | } | |
2341 | ||
05019a9e TM |
2342 | static int ext4_delete_entry(handle_t *handle, |
2343 | struct inode *dir, | |
2344 | struct ext4_dir_entry_2 *de_del, | |
2345 | struct buffer_head *bh) | |
2346 | { | |
2347 | int err, csum_size = 0; | |
2348 | ||
9f40fe54 TM |
2349 | if (ext4_has_inline_data(dir)) { |
2350 | int has_inline_data = 1; | |
2351 | err = ext4_delete_inline_entry(handle, dir, de_del, bh, | |
2352 | &has_inline_data); | |
2353 | if (has_inline_data) | |
2354 | return err; | |
2355 | } | |
2356 | ||
9aa5d32b | 2357 | if (ext4_has_metadata_csum(dir->i_sb)) |
05019a9e TM |
2358 | csum_size = sizeof(struct ext4_dir_entry_tail); |
2359 | ||
2360 | BUFFER_TRACE(bh, "get_write_access"); | |
2361 | err = ext4_journal_get_write_access(handle, bh); | |
2362 | if (unlikely(err)) | |
2363 | goto out; | |
2364 | ||
2365 | err = ext4_generic_delete_entry(handle, dir, de_del, | |
2366 | bh, bh->b_data, | |
2367 | dir->i_sb->s_blocksize, csum_size); | |
2368 | if (err) | |
2369 | goto out; | |
2370 | ||
2371 | BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata"); | |
2372 | err = ext4_handle_dirty_dirent_node(handle, dir, bh); | |
2373 | if (unlikely(err)) | |
2374 | goto out; | |
2375 | ||
2376 | return 0; | |
2377 | out: | |
2378 | if (err != -ENOENT) | |
2379 | ext4_std_error(dir->i_sb, err); | |
2380 | return err; | |
2381 | } | |
2382 | ||
f8628a14 | 2383 | /* |
c7414892 AD |
2384 | * Set directory link count to 1 if nlinks > EXT4_LINK_MAX, or if nlinks == 2 |
2385 | * since this indicates that nlinks count was previously 1 to avoid overflowing | |
2386 | * the 16-bit i_links_count field on disk. Directories with i_nlink == 1 mean | |
2387 | * that subdirectory link counts are not being maintained accurately. | |
2388 | * | |
2389 | * The caller has already checked for i_nlink overflow in case the DIR_LINK | |
2390 | * feature is not enabled and returned -EMLINK. The is_dx() check is a proxy | |
2391 | * for checking S_ISDIR(inode) (since the INODE_INDEX feature will not be set | |
2392 | * on regular files) and to avoid creating huge/slow non-HTREE directories. | |
f8628a14 AD |
2393 | */ |
2394 | static void ext4_inc_count(handle_t *handle, struct inode *inode) | |
2395 | { | |
2396 | inc_nlink(inode); | |
c7414892 AD |
2397 | if (is_dx(inode) && |
2398 | (inode->i_nlink > EXT4_LINK_MAX || inode->i_nlink == 2)) | |
2399 | set_nlink(inode, 1); | |
f8628a14 AD |
2400 | } |
2401 | ||
2402 | /* | |
2403 | * If a directory had nlink == 1, then we should let it be 1. This indicates | |
2404 | * directory has >EXT4_LINK_MAX subdirs. | |
2405 | */ | |
2406 | static void ext4_dec_count(handle_t *handle, struct inode *inode) | |
2407 | { | |
909a4cf1 AD |
2408 | if (!S_ISDIR(inode->i_mode) || inode->i_nlink > 2) |
2409 | drop_nlink(inode); | |
f8628a14 AD |
2410 | } |
2411 | ||
2412 | ||
617ba13b | 2413 | static int ext4_add_nondir(handle_t *handle, |
ac27a0ec DK |
2414 | struct dentry *dentry, struct inode *inode) |
2415 | { | |
617ba13b | 2416 | int err = ext4_add_entry(handle, dentry, inode); |
ac27a0ec | 2417 | if (!err) { |
617ba13b | 2418 | ext4_mark_inode_dirty(handle, inode); |
6b38e842 | 2419 | unlock_new_inode(inode); |
8fc37ec5 | 2420 | d_instantiate(dentry, inode); |
ac27a0ec DK |
2421 | return 0; |
2422 | } | |
731b9a54 | 2423 | drop_nlink(inode); |
6b38e842 | 2424 | unlock_new_inode(inode); |
ac27a0ec DK |
2425 | iput(inode); |
2426 | return err; | |
2427 | } | |
2428 | ||
2429 | /* | |
2430 | * By the time this is called, we already have created | |
2431 | * the directory cache entry for the new file, but it | |
2432 | * is so far negative - it has no inode. | |
2433 | * | |
2434 | * If the create succeeds, we fill in the inode information | |
2435 | * with d_instantiate(). | |
2436 | */ | |
4acdaf27 | 2437 | static int ext4_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
ebfc3b49 | 2438 | bool excl) |
ac27a0ec DK |
2439 | { |
2440 | handle_t *handle; | |
af5bc92d | 2441 | struct inode *inode; |
1139575a | 2442 | int err, credits, retries = 0; |
ac27a0ec | 2443 | |
a7cdadee JK |
2444 | err = dquot_initialize(dir); |
2445 | if (err) | |
2446 | return err; | |
907f4554 | 2447 | |
1139575a | 2448 | credits = (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) + |
eb9cc7e1 | 2449 | EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3); |
ac27a0ec | 2450 | retry: |
1139575a TT |
2451 | inode = ext4_new_inode_start_handle(dir, mode, &dentry->d_name, 0, |
2452 | NULL, EXT4_HT_DIR, credits); | |
2453 | handle = ext4_journal_current_handle(); | |
ac27a0ec DK |
2454 | err = PTR_ERR(inode); |
2455 | if (!IS_ERR(inode)) { | |
617ba13b | 2456 | inode->i_op = &ext4_file_inode_operations; |
be64f884 | 2457 | inode->i_fop = &ext4_file_operations; |
617ba13b | 2458 | ext4_set_aops(inode); |
e709e9df | 2459 | err = ext4_add_nondir(handle, dentry, inode); |
1139575a TT |
2460 | if (!err && IS_DIRSYNC(dir)) |
2461 | ext4_handle_sync(handle); | |
ac27a0ec | 2462 | } |
1139575a TT |
2463 | if (handle) |
2464 | ext4_journal_stop(handle); | |
617ba13b | 2465 | if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries)) |
ac27a0ec DK |
2466 | goto retry; |
2467 | return err; | |
2468 | } | |
2469 | ||
af5bc92d | 2470 | static int ext4_mknod(struct inode *dir, struct dentry *dentry, |
1a67aafb | 2471 | umode_t mode, dev_t rdev) |
ac27a0ec DK |
2472 | { |
2473 | handle_t *handle; | |
2474 | struct inode *inode; | |
1139575a | 2475 | int err, credits, retries = 0; |
ac27a0ec | 2476 | |
a7cdadee JK |
2477 | err = dquot_initialize(dir); |
2478 | if (err) | |
2479 | return err; | |
907f4554 | 2480 | |
1139575a | 2481 | credits = (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) + |
eb9cc7e1 | 2482 | EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3); |
ac27a0ec | 2483 | retry: |
1139575a TT |
2484 | inode = ext4_new_inode_start_handle(dir, mode, &dentry->d_name, 0, |
2485 | NULL, EXT4_HT_DIR, credits); | |
2486 | handle = ext4_journal_current_handle(); | |
ac27a0ec DK |
2487 | err = PTR_ERR(inode); |
2488 | if (!IS_ERR(inode)) { | |
2489 | init_special_inode(inode, inode->i_mode, rdev); | |
617ba13b | 2490 | inode->i_op = &ext4_special_inode_operations; |
617ba13b | 2491 | err = ext4_add_nondir(handle, dentry, inode); |
1139575a TT |
2492 | if (!err && IS_DIRSYNC(dir)) |
2493 | ext4_handle_sync(handle); | |
ac27a0ec | 2494 | } |
1139575a TT |
2495 | if (handle) |
2496 | ext4_journal_stop(handle); | |
617ba13b | 2497 | if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries)) |
ac27a0ec DK |
2498 | goto retry; |
2499 | return err; | |
2500 | } | |
2501 | ||
af51a2ac AV |
2502 | static int ext4_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode) |
2503 | { | |
2504 | handle_t *handle; | |
2505 | struct inode *inode; | |
2506 | int err, retries = 0; | |
2507 | ||
a7cdadee JK |
2508 | err = dquot_initialize(dir); |
2509 | if (err) | |
2510 | return err; | |
af51a2ac AV |
2511 | |
2512 | retry: | |
2513 | inode = ext4_new_inode_start_handle(dir, mode, | |
2514 | NULL, 0, NULL, | |
2515 | EXT4_HT_DIR, | |
2516 | EXT4_MAXQUOTAS_INIT_BLOCKS(dir->i_sb) + | |
2517 | 4 + EXT4_XATTR_TRANS_BLOCKS); | |
2518 | handle = ext4_journal_current_handle(); | |
2519 | err = PTR_ERR(inode); | |
2520 | if (!IS_ERR(inode)) { | |
2521 | inode->i_op = &ext4_file_inode_operations; | |
be64f884 | 2522 | inode->i_fop = &ext4_file_operations; |
af51a2ac | 2523 | ext4_set_aops(inode); |
e94bd349 | 2524 | d_tmpfile(dentry, inode); |
af51a2ac AV |
2525 | err = ext4_orphan_add(handle, inode); |
2526 | if (err) | |
43ae9e3f | 2527 | goto err_unlock_inode; |
af51a2ac | 2528 | mark_inode_dirty(inode); |
af51a2ac AV |
2529 | unlock_new_inode(inode); |
2530 | } | |
2531 | if (handle) | |
2532 | ext4_journal_stop(handle); | |
2533 | if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries)) | |
2534 | goto retry; | |
2535 | return err; | |
43ae9e3f | 2536 | err_unlock_inode: |
af51a2ac AV |
2537 | ext4_journal_stop(handle); |
2538 | unlock_new_inode(inode); | |
af51a2ac AV |
2539 | return err; |
2540 | } | |
2541 | ||
a774f9c2 TM |
2542 | struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, |
2543 | struct ext4_dir_entry_2 *de, | |
2544 | int blocksize, int csum_size, | |
2545 | unsigned int parent_ino, int dotdot_real_len) | |
2546 | { | |
2547 | de->inode = cpu_to_le32(inode->i_ino); | |
2548 | de->name_len = 1; | |
2549 | de->rec_len = ext4_rec_len_to_disk(EXT4_DIR_REC_LEN(de->name_len), | |
2550 | blocksize); | |
2551 | strcpy(de->name, "."); | |
2552 | ext4_set_de_type(inode->i_sb, de, S_IFDIR); | |
2553 | ||
2554 | de = ext4_next_entry(de, blocksize); | |
2555 | de->inode = cpu_to_le32(parent_ino); | |
2556 | de->name_len = 2; | |
2557 | if (!dotdot_real_len) | |
2558 | de->rec_len = ext4_rec_len_to_disk(blocksize - | |
2559 | (csum_size + EXT4_DIR_REC_LEN(1)), | |
2560 | blocksize); | |
2561 | else | |
2562 | de->rec_len = ext4_rec_len_to_disk( | |
2563 | EXT4_DIR_REC_LEN(de->name_len), blocksize); | |
2564 | strcpy(de->name, ".."); | |
2565 | ext4_set_de_type(inode->i_sb, de, S_IFDIR); | |
2566 | ||
2567 | return ext4_next_entry(de, blocksize); | |
2568 | } | |
2569 | ||
2570 | static int ext4_init_new_dir(handle_t *handle, struct inode *dir, | |
2571 | struct inode *inode) | |
ac27a0ec | 2572 | { |
dabd991f | 2573 | struct buffer_head *dir_block = NULL; |
af5bc92d | 2574 | struct ext4_dir_entry_2 *de; |
b0336e8d | 2575 | struct ext4_dir_entry_tail *t; |
dc6982ff | 2576 | ext4_lblk_t block = 0; |
3d0518f4 | 2577 | unsigned int blocksize = dir->i_sb->s_blocksize; |
b0336e8d | 2578 | int csum_size = 0; |
a774f9c2 | 2579 | int err; |
ac27a0ec | 2580 | |
9aa5d32b | 2581 | if (ext4_has_metadata_csum(dir->i_sb)) |
b0336e8d DW |
2582 | csum_size = sizeof(struct ext4_dir_entry_tail); |
2583 | ||
3c47d541 TM |
2584 | if (ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) { |
2585 | err = ext4_try_create_inline_dir(handle, dir, inode); | |
2586 | if (err < 0 && err != -ENOSPC) | |
2587 | goto out; | |
2588 | if (!err) | |
2589 | goto out; | |
2590 | } | |
2591 | ||
dc6982ff | 2592 | inode->i_size = 0; |
0f70b406 TT |
2593 | dir_block = ext4_append(handle, inode, &block); |
2594 | if (IS_ERR(dir_block)) | |
2595 | return PTR_ERR(dir_block); | |
a774f9c2 TM |
2596 | de = (struct ext4_dir_entry_2 *)dir_block->b_data; |
2597 | ext4_init_dot_dotdot(inode, de, blocksize, csum_size, dir->i_ino, 0); | |
2598 | set_nlink(inode, 2); | |
2599 | if (csum_size) { | |
2600 | t = EXT4_DIRENT_TAIL(dir_block->b_data, blocksize); | |
2601 | initialize_dirent_tail(t, blocksize); | |
2602 | } | |
2603 | ||
2604 | BUFFER_TRACE(dir_block, "call ext4_handle_dirty_metadata"); | |
2605 | err = ext4_handle_dirty_dirent_node(handle, inode, dir_block); | |
2606 | if (err) | |
2607 | goto out; | |
2608 | set_buffer_verified(dir_block); | |
2609 | out: | |
2610 | brelse(dir_block); | |
2611 | return err; | |
2612 | } | |
2613 | ||
2614 | static int ext4_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) | |
2615 | { | |
2616 | handle_t *handle; | |
2617 | struct inode *inode; | |
1139575a | 2618 | int err, credits, retries = 0; |
a774f9c2 | 2619 | |
f8628a14 | 2620 | if (EXT4_DIR_LINK_MAX(dir)) |
ac27a0ec DK |
2621 | return -EMLINK; |
2622 | ||
a7cdadee JK |
2623 | err = dquot_initialize(dir); |
2624 | if (err) | |
2625 | return err; | |
907f4554 | 2626 | |
1139575a | 2627 | credits = (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) + |
eb9cc7e1 | 2628 | EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3); |
ac27a0ec | 2629 | retry: |
1139575a TT |
2630 | inode = ext4_new_inode_start_handle(dir, S_IFDIR | mode, |
2631 | &dentry->d_name, | |
2632 | 0, NULL, EXT4_HT_DIR, credits); | |
2633 | handle = ext4_journal_current_handle(); | |
ac27a0ec DK |
2634 | err = PTR_ERR(inode); |
2635 | if (IS_ERR(inode)) | |
2636 | goto out_stop; | |
2637 | ||
617ba13b MC |
2638 | inode->i_op = &ext4_dir_inode_operations; |
2639 | inode->i_fop = &ext4_dir_operations; | |
a774f9c2 | 2640 | err = ext4_init_new_dir(handle, dir, inode); |
dabd991f NK |
2641 | if (err) |
2642 | goto out_clear_inode; | |
2643 | err = ext4_mark_inode_dirty(handle, inode); | |
2644 | if (!err) | |
2645 | err = ext4_add_entry(handle, dentry, inode); | |
ac27a0ec | 2646 | if (err) { |
4cdeed86 AK |
2647 | out_clear_inode: |
2648 | clear_nlink(inode); | |
6b38e842 | 2649 | unlock_new_inode(inode); |
617ba13b | 2650 | ext4_mark_inode_dirty(handle, inode); |
af5bc92d | 2651 | iput(inode); |
ac27a0ec DK |
2652 | goto out_stop; |
2653 | } | |
f8628a14 | 2654 | ext4_inc_count(handle, dir); |
617ba13b | 2655 | ext4_update_dx_flag(dir); |
dabd991f NK |
2656 | err = ext4_mark_inode_dirty(handle, dir); |
2657 | if (err) | |
2658 | goto out_clear_inode; | |
6b38e842 | 2659 | unlock_new_inode(inode); |
8fc37ec5 | 2660 | d_instantiate(dentry, inode); |
1139575a TT |
2661 | if (IS_DIRSYNC(dir)) |
2662 | ext4_handle_sync(handle); | |
2663 | ||
ac27a0ec | 2664 | out_stop: |
1139575a TT |
2665 | if (handle) |
2666 | ext4_journal_stop(handle); | |
617ba13b | 2667 | if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries)) |
ac27a0ec DK |
2668 | goto retry; |
2669 | return err; | |
2670 | } | |
2671 | ||
2672 | /* | |
2673 | * routine to check that the specified directory is empty (for rmdir) | |
2674 | */ | |
a7550b30 | 2675 | bool ext4_empty_dir(struct inode *inode) |
ac27a0ec | 2676 | { |
498e5f24 | 2677 | unsigned int offset; |
af5bc92d TT |
2678 | struct buffer_head *bh; |
2679 | struct ext4_dir_entry_2 *de, *de1; | |
2680 | struct super_block *sb; | |
ac27a0ec | 2681 | |
61f86638 TM |
2682 | if (ext4_has_inline_data(inode)) { |
2683 | int has_inline_data = 1; | |
a7550b30 | 2684 | int ret; |
61f86638 | 2685 | |
a7550b30 | 2686 | ret = empty_inline_dir(inode, &has_inline_data); |
61f86638 | 2687 | if (has_inline_data) |
a7550b30 | 2688 | return ret; |
61f86638 TM |
2689 | } |
2690 | ||
ac27a0ec | 2691 | sb = inode->i_sb; |
dc6982ff TT |
2692 | if (inode->i_size < EXT4_DIR_REC_LEN(1) + EXT4_DIR_REC_LEN(2)) { |
2693 | EXT4_ERROR_INODE(inode, "invalid size"); | |
a7550b30 | 2694 | return true; |
ac27a0ec | 2695 | } |
dc6982ff TT |
2696 | bh = ext4_read_dirblock(inode, 0, EITHER); |
2697 | if (IS_ERR(bh)) | |
a7550b30 | 2698 | return true; |
dc6982ff | 2699 | |
617ba13b | 2700 | de = (struct ext4_dir_entry_2 *) bh->b_data; |
3d0518f4 | 2701 | de1 = ext4_next_entry(de, sb->s_blocksize); |
ac27a0ec | 2702 | if (le32_to_cpu(de->inode) != inode->i_ino || |
b03a2f7e AD |
2703 | le32_to_cpu(de1->inode) == 0 || |
2704 | strcmp(".", de->name) || strcmp("..", de1->name)) { | |
2705 | ext4_warning_inode(inode, "directory missing '.' and/or '..'"); | |
af5bc92d | 2706 | brelse(bh); |
a7550b30 | 2707 | return true; |
ac27a0ec | 2708 | } |
3d0518f4 WY |
2709 | offset = ext4_rec_len_from_disk(de->rec_len, sb->s_blocksize) + |
2710 | ext4_rec_len_from_disk(de1->rec_len, sb->s_blocksize); | |
2711 | de = ext4_next_entry(de1, sb->s_blocksize); | |
af5bc92d | 2712 | while (offset < inode->i_size) { |
236f5ecb | 2713 | if ((void *) de >= (void *) (bh->b_data+sb->s_blocksize)) { |
24676da4 | 2714 | unsigned int lblock; |
af5bc92d | 2715 | brelse(bh); |
24676da4 | 2716 | lblock = offset >> EXT4_BLOCK_SIZE_BITS(sb); |
dc6982ff TT |
2717 | bh = ext4_read_dirblock(inode, lblock, EITHER); |
2718 | if (IS_ERR(bh)) | |
a7550b30 | 2719 | return true; |
617ba13b | 2720 | de = (struct ext4_dir_entry_2 *) bh->b_data; |
ac27a0ec | 2721 | } |
226ba972 TM |
2722 | if (ext4_check_dir_entry(inode, NULL, de, bh, |
2723 | bh->b_data, bh->b_size, offset)) { | |
617ba13b | 2724 | de = (struct ext4_dir_entry_2 *)(bh->b_data + |
ac27a0ec DK |
2725 | sb->s_blocksize); |
2726 | offset = (offset | (sb->s_blocksize - 1)) + 1; | |
2727 | continue; | |
2728 | } | |
2729 | if (le32_to_cpu(de->inode)) { | |
af5bc92d | 2730 | brelse(bh); |
a7550b30 | 2731 | return false; |
ac27a0ec | 2732 | } |
3d0518f4 WY |
2733 | offset += ext4_rec_len_from_disk(de->rec_len, sb->s_blocksize); |
2734 | de = ext4_next_entry(de, sb->s_blocksize); | |
ac27a0ec | 2735 | } |
af5bc92d | 2736 | brelse(bh); |
a7550b30 | 2737 | return true; |
ac27a0ec DK |
2738 | } |
2739 | ||
d745a8c2 JK |
2740 | /* |
2741 | * ext4_orphan_add() links an unlinked or truncated inode into a list of | |
ac27a0ec DK |
2742 | * such inodes, starting at the superblock, in case we crash before the |
2743 | * file is closed/deleted, or in case the inode truncate spans multiple | |
2744 | * transactions and the last transaction is not recovered after a crash. | |
2745 | * | |
2746 | * At filesystem recovery time, we walk this list deleting unlinked | |
617ba13b | 2747 | * inodes and truncating linked inodes in ext4_orphan_cleanup(). |
d745a8c2 JK |
2748 | * |
2749 | * Orphan list manipulation functions must be called under i_mutex unless | |
2750 | * we are just creating the inode or deleting it. | |
ac27a0ec | 2751 | */ |
617ba13b | 2752 | int ext4_orphan_add(handle_t *handle, struct inode *inode) |
ac27a0ec DK |
2753 | { |
2754 | struct super_block *sb = inode->i_sb; | |
cd2c080c | 2755 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
617ba13b | 2756 | struct ext4_iloc iloc; |
ac27a0ec | 2757 | int err = 0, rc; |
d745a8c2 | 2758 | bool dirty = false; |
ac27a0ec | 2759 | |
e2bfb088 | 2760 | if (!sbi->s_journal || is_bad_inode(inode)) |
0390131b FM |
2761 | return 0; |
2762 | ||
d745a8c2 | 2763 | WARN_ON_ONCE(!(inode->i_state & (I_NEW | I_FREEING)) && |
5955102c | 2764 | !inode_is_locked(inode)); |
d745a8c2 JK |
2765 | /* |
2766 | * Exit early if inode already is on orphan list. This is a big speedup | |
2767 | * since we don't have to contend on the global s_orphan_lock. | |
2768 | */ | |
617ba13b | 2769 | if (!list_empty(&EXT4_I(inode)->i_orphan)) |
d745a8c2 | 2770 | return 0; |
ac27a0ec | 2771 | |
afb86178 LC |
2772 | /* |
2773 | * Orphan handling is only valid for files with data blocks | |
2774 | * being truncated, or files being unlinked. Note that we either | |
2775 | * hold i_mutex, or the inode can not be referenced from outside, | |
2776 | * so i_nlink should not be bumped due to race | |
ac27a0ec | 2777 | */ |
af5bc92d TT |
2778 | J_ASSERT((S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || |
2779 | S_ISLNK(inode->i_mode)) || inode->i_nlink == 0); | |
ac27a0ec | 2780 | |
cd2c080c JK |
2781 | BUFFER_TRACE(sbi->s_sbh, "get_write_access"); |
2782 | err = ext4_journal_get_write_access(handle, sbi->s_sbh); | |
ac27a0ec | 2783 | if (err) |
d745a8c2 | 2784 | goto out; |
ac27a0ec | 2785 | |
617ba13b | 2786 | err = ext4_reserve_inode_write(handle, inode, &iloc); |
ac27a0ec | 2787 | if (err) |
d745a8c2 JK |
2788 | goto out; |
2789 | ||
2790 | mutex_lock(&sbi->s_orphan_lock); | |
6e3617e5 DM |
2791 | /* |
2792 | * Due to previous errors inode may be already a part of on-disk | |
2793 | * orphan list. If so skip on-disk list modification. | |
2794 | */ | |
d745a8c2 JK |
2795 | if (!NEXT_ORPHAN(inode) || NEXT_ORPHAN(inode) > |
2796 | (le32_to_cpu(sbi->s_es->s_inodes_count))) { | |
2797 | /* Insert this inode at the head of the on-disk orphan list */ | |
2798 | NEXT_ORPHAN(inode) = le32_to_cpu(sbi->s_es->s_last_orphan); | |
2799 | sbi->s_es->s_last_orphan = cpu_to_le32(inode->i_ino); | |
2800 | dirty = true; | |
2801 | } | |
2802 | list_add(&EXT4_I(inode)->i_orphan, &sbi->s_orphan); | |
2803 | mutex_unlock(&sbi->s_orphan_lock); | |
ac27a0ec | 2804 | |
d745a8c2 JK |
2805 | if (dirty) { |
2806 | err = ext4_handle_dirty_super(handle, sb); | |
2807 | rc = ext4_mark_iloc_dirty(handle, inode, &iloc); | |
2808 | if (!err) | |
2809 | err = rc; | |
2810 | if (err) { | |
2811 | /* | |
2812 | * We have to remove inode from in-memory list if | |
2813 | * addition to on disk orphan list failed. Stray orphan | |
2814 | * list entries can cause panics at unmount time. | |
2815 | */ | |
2816 | mutex_lock(&sbi->s_orphan_lock); | |
74177f55 | 2817 | list_del_init(&EXT4_I(inode)->i_orphan); |
d745a8c2 JK |
2818 | mutex_unlock(&sbi->s_orphan_lock); |
2819 | } | |
2820 | } | |
ac27a0ec DK |
2821 | jbd_debug(4, "superblock will point to %lu\n", inode->i_ino); |
2822 | jbd_debug(4, "orphan inode %lu will point to %d\n", | |
2823 | inode->i_ino, NEXT_ORPHAN(inode)); | |
d745a8c2 | 2824 | out: |
cd2c080c | 2825 | ext4_std_error(sb, err); |
ac27a0ec DK |
2826 | return err; |
2827 | } | |
2828 | ||
2829 | /* | |
617ba13b | 2830 | * ext4_orphan_del() removes an unlinked or truncated inode from the list |
ac27a0ec DK |
2831 | * of such inodes stored on disk, because it is finally being cleaned up. |
2832 | */ | |
617ba13b | 2833 | int ext4_orphan_del(handle_t *handle, struct inode *inode) |
ac27a0ec DK |
2834 | { |
2835 | struct list_head *prev; | |
617ba13b | 2836 | struct ext4_inode_info *ei = EXT4_I(inode); |
cd2c080c | 2837 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
498e5f24 | 2838 | __u32 ino_next; |
617ba13b | 2839 | struct ext4_iloc iloc; |
ac27a0ec DK |
2840 | int err = 0; |
2841 | ||
cd2c080c | 2842 | if (!sbi->s_journal && !(sbi->s_mount_state & EXT4_ORPHAN_FS)) |
0390131b FM |
2843 | return 0; |
2844 | ||
d745a8c2 | 2845 | WARN_ON_ONCE(!(inode->i_state & (I_NEW | I_FREEING)) && |
5955102c | 2846 | !inode_is_locked(inode)); |
d745a8c2 | 2847 | /* Do this quick check before taking global s_orphan_lock. */ |
3b9d4ed2 | 2848 | if (list_empty(&ei->i_orphan)) |
d745a8c2 | 2849 | return 0; |
ac27a0ec | 2850 | |
d745a8c2 JK |
2851 | if (handle) { |
2852 | /* Grab inode buffer early before taking global s_orphan_lock */ | |
2853 | err = ext4_reserve_inode_write(handle, inode, &iloc); | |
2854 | } | |
ac27a0ec | 2855 | |
d745a8c2 | 2856 | mutex_lock(&sbi->s_orphan_lock); |
ac27a0ec DK |
2857 | jbd_debug(4, "remove inode %lu from orphan list\n", inode->i_ino); |
2858 | ||
d745a8c2 | 2859 | prev = ei->i_orphan.prev; |
ac27a0ec DK |
2860 | list_del_init(&ei->i_orphan); |
2861 | ||
2862 | /* If we're on an error path, we may not have a valid | |
2863 | * transaction handle with which to update the orphan list on | |
2864 | * disk, but we still need to remove the inode from the linked | |
2865 | * list in memory. */ | |
d745a8c2 JK |
2866 | if (!handle || err) { |
2867 | mutex_unlock(&sbi->s_orphan_lock); | |
ac27a0ec | 2868 | goto out_err; |
d745a8c2 | 2869 | } |
ac27a0ec | 2870 | |
d745a8c2 | 2871 | ino_next = NEXT_ORPHAN(inode); |
ac27a0ec | 2872 | if (prev == &sbi->s_orphan) { |
498e5f24 | 2873 | jbd_debug(4, "superblock will point to %u\n", ino_next); |
ac27a0ec | 2874 | BUFFER_TRACE(sbi->s_sbh, "get_write_access"); |
617ba13b | 2875 | err = ext4_journal_get_write_access(handle, sbi->s_sbh); |
d745a8c2 JK |
2876 | if (err) { |
2877 | mutex_unlock(&sbi->s_orphan_lock); | |
ac27a0ec | 2878 | goto out_brelse; |
d745a8c2 | 2879 | } |
ac27a0ec | 2880 | sbi->s_es->s_last_orphan = cpu_to_le32(ino_next); |
d745a8c2 | 2881 | mutex_unlock(&sbi->s_orphan_lock); |
b50924c2 | 2882 | err = ext4_handle_dirty_super(handle, inode->i_sb); |
ac27a0ec | 2883 | } else { |
617ba13b | 2884 | struct ext4_iloc iloc2; |
ac27a0ec | 2885 | struct inode *i_prev = |
617ba13b | 2886 | &list_entry(prev, struct ext4_inode_info, i_orphan)->vfs_inode; |
ac27a0ec | 2887 | |
498e5f24 | 2888 | jbd_debug(4, "orphan inode %lu will point to %u\n", |
ac27a0ec | 2889 | i_prev->i_ino, ino_next); |
617ba13b | 2890 | err = ext4_reserve_inode_write(handle, i_prev, &iloc2); |
d745a8c2 JK |
2891 | if (err) { |
2892 | mutex_unlock(&sbi->s_orphan_lock); | |
ac27a0ec | 2893 | goto out_brelse; |
d745a8c2 | 2894 | } |
ac27a0ec | 2895 | NEXT_ORPHAN(i_prev) = ino_next; |
617ba13b | 2896 | err = ext4_mark_iloc_dirty(handle, i_prev, &iloc2); |
d745a8c2 | 2897 | mutex_unlock(&sbi->s_orphan_lock); |
ac27a0ec DK |
2898 | } |
2899 | if (err) | |
2900 | goto out_brelse; | |
2901 | NEXT_ORPHAN(inode) = 0; | |
617ba13b | 2902 | err = ext4_mark_iloc_dirty(handle, inode, &iloc); |
ac27a0ec | 2903 | out_err: |
617ba13b | 2904 | ext4_std_error(inode->i_sb, err); |
ac27a0ec DK |
2905 | return err; |
2906 | ||
2907 | out_brelse: | |
2908 | brelse(iloc.bh); | |
2909 | goto out_err; | |
2910 | } | |
2911 | ||
af5bc92d | 2912 | static int ext4_rmdir(struct inode *dir, struct dentry *dentry) |
ac27a0ec DK |
2913 | { |
2914 | int retval; | |
af5bc92d TT |
2915 | struct inode *inode; |
2916 | struct buffer_head *bh; | |
2917 | struct ext4_dir_entry_2 *de; | |
8dcfaad2 | 2918 | handle_t *handle = NULL; |
ac27a0ec | 2919 | |
0db1ff22 TT |
2920 | if (unlikely(ext4_forced_shutdown(EXT4_SB(dir->i_sb)))) |
2921 | return -EIO; | |
2922 | ||
ac27a0ec DK |
2923 | /* Initialize quotas before so that eventual writes go in |
2924 | * separate transaction */ | |
a7cdadee JK |
2925 | retval = dquot_initialize(dir); |
2926 | if (retval) | |
2927 | return retval; | |
2928 | retval = dquot_initialize(d_inode(dentry)); | |
2929 | if (retval) | |
2930 | return retval; | |
907f4554 | 2931 | |
ac27a0ec | 2932 | retval = -ENOENT; |
32f7f22c | 2933 | bh = ext4_find_entry(dir, &dentry->d_name, &de, NULL); |
36de9286 TT |
2934 | if (IS_ERR(bh)) |
2935 | return PTR_ERR(bh); | |
ac27a0ec DK |
2936 | if (!bh) |
2937 | goto end_rmdir; | |
2938 | ||
2b0143b5 | 2939 | inode = d_inode(dentry); |
ac27a0ec | 2940 | |
6a797d27 | 2941 | retval = -EFSCORRUPTED; |
ac27a0ec DK |
2942 | if (le32_to_cpu(de->inode) != inode->i_ino) |
2943 | goto end_rmdir; | |
2944 | ||
2945 | retval = -ENOTEMPTY; | |
e875a2dd | 2946 | if (!ext4_empty_dir(inode)) |
ac27a0ec DK |
2947 | goto end_rmdir; |
2948 | ||
8dcfaad2 | 2949 | handle = ext4_journal_start(dir, EXT4_HT_DIR, |
64044abf | 2950 | EXT4_DATA_TRANS_BLOCKS(dir->i_sb)); |
8dcfaad2 TT |
2951 | if (IS_ERR(handle)) { |
2952 | retval = PTR_ERR(handle); | |
2953 | handle = NULL; | |
2954 | goto end_rmdir; | |
2955 | } | |
2956 | ||
2957 | if (IS_DIRSYNC(dir)) | |
2958 | ext4_handle_sync(handle); | |
2959 | ||
617ba13b | 2960 | retval = ext4_delete_entry(handle, dir, de, bh); |
ac27a0ec DK |
2961 | if (retval) |
2962 | goto end_rmdir; | |
f8628a14 | 2963 | if (!EXT4_DIR_LINK_EMPTY(inode)) |
b03a2f7e AD |
2964 | ext4_warning_inode(inode, |
2965 | "empty directory '%.*s' has too many links (%u)", | |
2966 | dentry->d_name.len, dentry->d_name.name, | |
af5bc92d | 2967 | inode->i_nlink); |
ac27a0ec DK |
2968 | inode->i_version++; |
2969 | clear_nlink(inode); | |
2970 | /* There's no need to set i_disksize: the fact that i_nlink is | |
2971 | * zero will ensure that the right thing happens during any | |
2972 | * recovery. */ | |
2973 | inode->i_size = 0; | |
617ba13b | 2974 | ext4_orphan_add(handle, inode); |
eeca7ea1 | 2975 | inode->i_ctime = dir->i_ctime = dir->i_mtime = current_time(inode); |
617ba13b | 2976 | ext4_mark_inode_dirty(handle, inode); |
f8628a14 | 2977 | ext4_dec_count(handle, dir); |
617ba13b MC |
2978 | ext4_update_dx_flag(dir); |
2979 | ext4_mark_inode_dirty(handle, dir); | |
ac27a0ec DK |
2980 | |
2981 | end_rmdir: | |
af5bc92d | 2982 | brelse(bh); |
8dcfaad2 TT |
2983 | if (handle) |
2984 | ext4_journal_stop(handle); | |
ac27a0ec DK |
2985 | return retval; |
2986 | } | |
2987 | ||
af5bc92d | 2988 | static int ext4_unlink(struct inode *dir, struct dentry *dentry) |
ac27a0ec DK |
2989 | { |
2990 | int retval; | |
af5bc92d TT |
2991 | struct inode *inode; |
2992 | struct buffer_head *bh; | |
2993 | struct ext4_dir_entry_2 *de; | |
931b6864 | 2994 | handle_t *handle = NULL; |
ac27a0ec | 2995 | |
0db1ff22 TT |
2996 | if (unlikely(ext4_forced_shutdown(EXT4_SB(dir->i_sb)))) |
2997 | return -EIO; | |
2998 | ||
0562e0ba | 2999 | trace_ext4_unlink_enter(dir, dentry); |
ac27a0ec DK |
3000 | /* Initialize quotas before so that eventual writes go |
3001 | * in separate transaction */ | |
a7cdadee JK |
3002 | retval = dquot_initialize(dir); |
3003 | if (retval) | |
3004 | return retval; | |
3005 | retval = dquot_initialize(d_inode(dentry)); | |
3006 | if (retval) | |
3007 | return retval; | |
907f4554 | 3008 | |
ac27a0ec | 3009 | retval = -ENOENT; |
32f7f22c | 3010 | bh = ext4_find_entry(dir, &dentry->d_name, &de, NULL); |
36de9286 TT |
3011 | if (IS_ERR(bh)) |
3012 | return PTR_ERR(bh); | |
ac27a0ec DK |
3013 | if (!bh) |
3014 | goto end_unlink; | |
3015 | ||
2b0143b5 | 3016 | inode = d_inode(dentry); |
ac27a0ec | 3017 | |
6a797d27 | 3018 | retval = -EFSCORRUPTED; |
ac27a0ec DK |
3019 | if (le32_to_cpu(de->inode) != inode->i_ino) |
3020 | goto end_unlink; | |
3021 | ||
931b6864 | 3022 | handle = ext4_journal_start(dir, EXT4_HT_DIR, |
64044abf | 3023 | EXT4_DATA_TRANS_BLOCKS(dir->i_sb)); |
931b6864 TT |
3024 | if (IS_ERR(handle)) { |
3025 | retval = PTR_ERR(handle); | |
3026 | handle = NULL; | |
3027 | goto end_unlink; | |
3028 | } | |
3029 | ||
3030 | if (IS_DIRSYNC(dir)) | |
3031 | ext4_handle_sync(handle); | |
3032 | ||
b03a2f7e AD |
3033 | if (inode->i_nlink == 0) { |
3034 | ext4_warning_inode(inode, "Deleting file '%.*s' with no links", | |
3035 | dentry->d_name.len, dentry->d_name.name); | |
bfe86848 | 3036 | set_nlink(inode, 1); |
ac27a0ec | 3037 | } |
617ba13b | 3038 | retval = ext4_delete_entry(handle, dir, de, bh); |
ac27a0ec DK |
3039 | if (retval) |
3040 | goto end_unlink; | |
eeca7ea1 | 3041 | dir->i_ctime = dir->i_mtime = current_time(dir); |
617ba13b MC |
3042 | ext4_update_dx_flag(dir); |
3043 | ext4_mark_inode_dirty(handle, dir); | |
825f1481 | 3044 | drop_nlink(inode); |
ac27a0ec | 3045 | if (!inode->i_nlink) |
617ba13b | 3046 | ext4_orphan_add(handle, inode); |
eeca7ea1 | 3047 | inode->i_ctime = current_time(inode); |
617ba13b | 3048 | ext4_mark_inode_dirty(handle, inode); |
ac27a0ec DK |
3049 | |
3050 | end_unlink: | |
af5bc92d | 3051 | brelse(bh); |
931b6864 TT |
3052 | if (handle) |
3053 | ext4_journal_stop(handle); | |
0562e0ba | 3054 | trace_ext4_unlink_exit(dentry, retval); |
ac27a0ec DK |
3055 | return retval; |
3056 | } | |
3057 | ||
af5bc92d TT |
3058 | static int ext4_symlink(struct inode *dir, |
3059 | struct dentry *dentry, const char *symname) | |
ac27a0ec DK |
3060 | { |
3061 | handle_t *handle; | |
af5bc92d | 3062 | struct inode *inode; |
f348c252 | 3063 | int err, len = strlen(symname); |
df5e6223 | 3064 | int credits; |
f348c252 | 3065 | bool encryption_required; |
a7550b30 JK |
3066 | struct fscrypt_str disk_link; |
3067 | struct fscrypt_symlink_data *sd = NULL; | |
ac27a0ec | 3068 | |
0db1ff22 TT |
3069 | if (unlikely(ext4_forced_shutdown(EXT4_SB(dir->i_sb)))) |
3070 | return -EIO; | |
3071 | ||
f348c252 TT |
3072 | disk_link.len = len + 1; |
3073 | disk_link.name = (char *) symname; | |
3074 | ||
6ddb2447 TT |
3075 | encryption_required = (ext4_encrypted_inode(dir) || |
3076 | DUMMY_ENCRYPTION_ENABLED(EXT4_SB(dir->i_sb))); | |
4d3c4e5b | 3077 | if (encryption_required) { |
a7550b30 | 3078 | err = fscrypt_get_encryption_info(dir); |
4d3c4e5b TT |
3079 | if (err) |
3080 | return err; | |
a7550b30 | 3081 | if (!fscrypt_has_encryption_key(dir)) |
54475f53 | 3082 | return -ENOKEY; |
a7550b30 JK |
3083 | disk_link.len = (fscrypt_fname_encrypted_size(dir, len) + |
3084 | sizeof(struct fscrypt_symlink_data)); | |
4d3c4e5b TT |
3085 | sd = kzalloc(disk_link.len, GFP_KERNEL); |
3086 | if (!sd) | |
3087 | return -ENOMEM; | |
3088 | } | |
3089 | ||
3090 | if (disk_link.len > dir->i_sb->s_blocksize) { | |
3091 | err = -ENAMETOOLONG; | |
3092 | goto err_free_sd; | |
3093 | } | |
ac27a0ec | 3094 | |
a7cdadee JK |
3095 | err = dquot_initialize(dir); |
3096 | if (err) | |
926631c2 | 3097 | goto err_free_sd; |
907f4554 | 3098 | |
f348c252 | 3099 | if ((disk_link.len > EXT4_N_BLOCKS * 4)) { |
df5e6223 JK |
3100 | /* |
3101 | * For non-fast symlinks, we just allocate inode and put it on | |
3102 | * orphan list in the first transaction => we need bitmap, | |
8c208719 ES |
3103 | * group descriptor, sb, inode block, quota blocks, and |
3104 | * possibly selinux xattr blocks. | |
df5e6223 | 3105 | */ |
8c208719 ES |
3106 | credits = 4 + EXT4_MAXQUOTAS_INIT_BLOCKS(dir->i_sb) + |
3107 | EXT4_XATTR_TRANS_BLOCKS; | |
df5e6223 JK |
3108 | } else { |
3109 | /* | |
3110 | * Fast symlink. We have to add entry to directory | |
3111 | * (EXT4_DATA_TRANS_BLOCKS + EXT4_INDEX_EXTRA_TRANS_BLOCKS), | |
3112 | * allocate new inode (bitmap, group descriptor, inode block, | |
3113 | * quota blocks, sb is already counted in previous macros). | |
3114 | */ | |
3115 | credits = EXT4_DATA_TRANS_BLOCKS(dir->i_sb) + | |
eb9cc7e1 | 3116 | EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3; |
df5e6223 | 3117 | } |
f348c252 | 3118 | |
1139575a TT |
3119 | inode = ext4_new_inode_start_handle(dir, S_IFLNK|S_IRWXUGO, |
3120 | &dentry->d_name, 0, NULL, | |
3121 | EXT4_HT_DIR, credits); | |
3122 | handle = ext4_journal_current_handle(); | |
f348c252 TT |
3123 | if (IS_ERR(inode)) { |
3124 | if (handle) | |
3125 | ext4_journal_stop(handle); | |
4d3c4e5b TT |
3126 | err = PTR_ERR(inode); |
3127 | goto err_free_sd; | |
f348c252 TT |
3128 | } |
3129 | ||
3130 | if (encryption_required) { | |
f348c252 | 3131 | struct qstr istr; |
a7550b30 JK |
3132 | struct fscrypt_str ostr = |
3133 | FSTR_INIT(sd->encrypted_path, disk_link.len); | |
f348c252 | 3134 | |
f348c252 TT |
3135 | istr.name = (const unsigned char *) symname; |
3136 | istr.len = len; | |
a7550b30 | 3137 | err = fscrypt_fname_usr_to_disk(inode, &istr, &ostr); |
ef1eb3aa | 3138 | if (err) |
f348c252 TT |
3139 | goto err_drop_inode; |
3140 | sd->len = cpu_to_le16(ostr.len); | |
3141 | disk_link.name = (char *) sd; | |
a7a67e8a | 3142 | inode->i_op = &ext4_encrypted_symlink_inode_operations; |
f348c252 | 3143 | } |
ac27a0ec | 3144 | |
f348c252 | 3145 | if ((disk_link.len > EXT4_N_BLOCKS * 4)) { |
a7a67e8a AV |
3146 | if (!encryption_required) |
3147 | inode->i_op = &ext4_symlink_inode_operations; | |
21fc61c7 | 3148 | inode_nohighmem(inode); |
617ba13b | 3149 | ext4_set_aops(inode); |
ac27a0ec | 3150 | /* |
df5e6223 JK |
3151 | * We cannot call page_symlink() with transaction started |
3152 | * because it calls into ext4_write_begin() which can wait | |
3153 | * for transaction commit if we are running out of space | |
3154 | * and thus we deadlock. So we have to stop transaction now | |
3155 | * and restart it when symlink contents is written. | |
3156 | * | |
3157 | * To keep fs consistent in case of crash, we have to put inode | |
3158 | * to orphan list in the mean time. | |
ac27a0ec | 3159 | */ |
df5e6223 JK |
3160 | drop_nlink(inode); |
3161 | err = ext4_orphan_add(handle, inode); | |
3162 | ext4_journal_stop(handle); | |
f348c252 | 3163 | handle = NULL; |
df5e6223 JK |
3164 | if (err) |
3165 | goto err_drop_inode; | |
f348c252 | 3166 | err = __page_symlink(inode, disk_link.name, disk_link.len, 1); |
df5e6223 JK |
3167 | if (err) |
3168 | goto err_drop_inode; | |
3169 | /* | |
3170 | * Now inode is being linked into dir (EXT4_DATA_TRANS_BLOCKS | |
3171 | * + EXT4_INDEX_EXTRA_TRANS_BLOCKS), inode is also modified | |
3172 | */ | |
9924a92a | 3173 | handle = ext4_journal_start(dir, EXT4_HT_DIR, |
df5e6223 JK |
3174 | EXT4_DATA_TRANS_BLOCKS(dir->i_sb) + |
3175 | EXT4_INDEX_EXTRA_TRANS_BLOCKS + 1); | |
3176 | if (IS_ERR(handle)) { | |
3177 | err = PTR_ERR(handle); | |
f348c252 | 3178 | handle = NULL; |
df5e6223 JK |
3179 | goto err_drop_inode; |
3180 | } | |
0ce8c010 | 3181 | set_nlink(inode, 1); |
df5e6223 | 3182 | err = ext4_orphan_del(handle, inode); |
f348c252 | 3183 | if (err) |
df5e6223 | 3184 | goto err_drop_inode; |
ac27a0ec | 3185 | } else { |
e65187e6 | 3186 | /* clear the extent format for fast symlink */ |
12e9b892 | 3187 | ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS); |
75e7566b | 3188 | if (!encryption_required) { |
a7a67e8a | 3189 | inode->i_op = &ext4_fast_symlink_inode_operations; |
75e7566b AV |
3190 | inode->i_link = (char *)&EXT4_I(inode)->i_data; |
3191 | } | |
f348c252 TT |
3192 | memcpy((char *)&EXT4_I(inode)->i_data, disk_link.name, |
3193 | disk_link.len); | |
3194 | inode->i_size = disk_link.len - 1; | |
ac27a0ec | 3195 | } |
617ba13b MC |
3196 | EXT4_I(inode)->i_disksize = inode->i_size; |
3197 | err = ext4_add_nondir(handle, dentry, inode); | |
1139575a TT |
3198 | if (!err && IS_DIRSYNC(dir)) |
3199 | ext4_handle_sync(handle); | |
3200 | ||
1139575a TT |
3201 | if (handle) |
3202 | ext4_journal_stop(handle); | |
f348c252 | 3203 | kfree(sd); |
ac27a0ec | 3204 | return err; |
df5e6223 | 3205 | err_drop_inode: |
f348c252 TT |
3206 | if (handle) |
3207 | ext4_journal_stop(handle); | |
f348c252 | 3208 | clear_nlink(inode); |
df5e6223 JK |
3209 | unlock_new_inode(inode); |
3210 | iput(inode); | |
4d3c4e5b TT |
3211 | err_free_sd: |
3212 | kfree(sd); | |
df5e6223 | 3213 | return err; |
ac27a0ec DK |
3214 | } |
3215 | ||
af5bc92d TT |
3216 | static int ext4_link(struct dentry *old_dentry, |
3217 | struct inode *dir, struct dentry *dentry) | |
ac27a0ec DK |
3218 | { |
3219 | handle_t *handle; | |
2b0143b5 | 3220 | struct inode *inode = d_inode(old_dentry); |
ac27a0ec DK |
3221 | int err, retries = 0; |
3222 | ||
b05ab1dc | 3223 | if (inode->i_nlink >= EXT4_LINK_MAX) |
ac27a0ec | 3224 | return -EMLINK; |
d9cdc903 | 3225 | if (ext4_encrypted_inode(dir) && |
a7550b30 | 3226 | !fscrypt_has_permitted_context(dir, inode)) |
d9cdc903 | 3227 | return -EPERM; |
040cb378 LX |
3228 | |
3229 | if ((ext4_test_inode_flag(dir, EXT4_INODE_PROJINHERIT)) && | |
3230 | (!projid_eq(EXT4_I(dir)->i_projid, | |
3231 | EXT4_I(old_dentry->d_inode)->i_projid))) | |
3232 | return -EXDEV; | |
3233 | ||
a7cdadee JK |
3234 | err = dquot_initialize(dir); |
3235 | if (err) | |
3236 | return err; | |
907f4554 | 3237 | |
ac27a0ec | 3238 | retry: |
9924a92a TT |
3239 | handle = ext4_journal_start(dir, EXT4_HT_DIR, |
3240 | (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) + | |
af51a2ac | 3241 | EXT4_INDEX_EXTRA_TRANS_BLOCKS) + 1); |
ac27a0ec DK |
3242 | if (IS_ERR(handle)) |
3243 | return PTR_ERR(handle); | |
3244 | ||
3245 | if (IS_DIRSYNC(dir)) | |
0390131b | 3246 | ext4_handle_sync(handle); |
ac27a0ec | 3247 | |
eeca7ea1 | 3248 | inode->i_ctime = current_time(inode); |
f8628a14 | 3249 | ext4_inc_count(handle, inode); |
7de9c6ee | 3250 | ihold(inode); |
ac27a0ec | 3251 | |
6b38e842 AV |
3252 | err = ext4_add_entry(handle, dentry, inode); |
3253 | if (!err) { | |
3254 | ext4_mark_inode_dirty(handle, inode); | |
af51a2ac AV |
3255 | /* this can happen only for tmpfile being |
3256 | * linked the first time | |
3257 | */ | |
3258 | if (inode->i_nlink == 1) | |
3259 | ext4_orphan_del(handle, inode); | |
6b38e842 AV |
3260 | d_instantiate(dentry, inode); |
3261 | } else { | |
3262 | drop_nlink(inode); | |
3263 | iput(inode); | |
3264 | } | |
617ba13b MC |
3265 | ext4_journal_stop(handle); |
3266 | if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries)) | |
ac27a0ec DK |
3267 | goto retry; |
3268 | return err; | |
3269 | } | |
3270 | ||
32f7f22c TM |
3271 | |
3272 | /* | |
3273 | * Try to find buffer head where contains the parent block. | |
3274 | * It should be the inode block if it is inlined or the 1st block | |
3275 | * if it is a normal dir. | |
3276 | */ | |
3277 | static struct buffer_head *ext4_get_first_dir_block(handle_t *handle, | |
3278 | struct inode *inode, | |
3279 | int *retval, | |
3280 | struct ext4_dir_entry_2 **parent_de, | |
3281 | int *inlined) | |
3282 | { | |
3283 | struct buffer_head *bh; | |
3284 | ||
3285 | if (!ext4_has_inline_data(inode)) { | |
dc6982ff TT |
3286 | bh = ext4_read_dirblock(inode, 0, EITHER); |
3287 | if (IS_ERR(bh)) { | |
3288 | *retval = PTR_ERR(bh); | |
32f7f22c TM |
3289 | return NULL; |
3290 | } | |
3291 | *parent_de = ext4_next_entry( | |
3292 | (struct ext4_dir_entry_2 *)bh->b_data, | |
3293 | inode->i_sb->s_blocksize); | |
3294 | return bh; | |
3295 | } | |
3296 | ||
3297 | *inlined = 1; | |
3298 | return ext4_get_first_inline_block(inode, parent_de, retval); | |
3299 | } | |
ac27a0ec | 3300 | |
c0d268c3 MS |
3301 | struct ext4_renament { |
3302 | struct inode *dir; | |
3303 | struct dentry *dentry; | |
3304 | struct inode *inode; | |
bd42998a MS |
3305 | bool is_dir; |
3306 | int dir_nlink_delta; | |
c0d268c3 MS |
3307 | |
3308 | /* entry for "dentry" */ | |
3309 | struct buffer_head *bh; | |
3310 | struct ext4_dir_entry_2 *de; | |
3311 | int inlined; | |
3312 | ||
3313 | /* entry for ".." in inode if it's a directory */ | |
3314 | struct buffer_head *dir_bh; | |
3315 | struct ext4_dir_entry_2 *parent_de; | |
3316 | int dir_inlined; | |
3317 | }; | |
3318 | ||
bd1af145 MS |
3319 | static int ext4_rename_dir_prepare(handle_t *handle, struct ext4_renament *ent) |
3320 | { | |
3321 | int retval; | |
3322 | ||
3323 | ent->dir_bh = ext4_get_first_dir_block(handle, ent->inode, | |
3324 | &retval, &ent->parent_de, | |
3325 | &ent->dir_inlined); | |
3326 | if (!ent->dir_bh) | |
3327 | return retval; | |
3328 | if (le32_to_cpu(ent->parent_de->inode) != ent->dir->i_ino) | |
6a797d27 | 3329 | return -EFSCORRUPTED; |
bd1af145 MS |
3330 | BUFFER_TRACE(ent->dir_bh, "get_write_access"); |
3331 | return ext4_journal_get_write_access(handle, ent->dir_bh); | |
3332 | } | |
3333 | ||
3334 | static int ext4_rename_dir_finish(handle_t *handle, struct ext4_renament *ent, | |
3335 | unsigned dir_ino) | |
3336 | { | |
3337 | int retval; | |
3338 | ||
3339 | ent->parent_de->inode = cpu_to_le32(dir_ino); | |
3340 | BUFFER_TRACE(ent->dir_bh, "call ext4_handle_dirty_metadata"); | |
3341 | if (!ent->dir_inlined) { | |
3342 | if (is_dx(ent->inode)) { | |
3343 | retval = ext4_handle_dirty_dx_node(handle, | |
3344 | ent->inode, | |
3345 | ent->dir_bh); | |
3346 | } else { | |
3347 | retval = ext4_handle_dirty_dirent_node(handle, | |
3348 | ent->inode, | |
3349 | ent->dir_bh); | |
3350 | } | |
3351 | } else { | |
3352 | retval = ext4_mark_inode_dirty(handle, ent->inode); | |
3353 | } | |
3354 | if (retval) { | |
3355 | ext4_std_error(ent->dir->i_sb, retval); | |
3356 | return retval; | |
3357 | } | |
3358 | return 0; | |
3359 | } | |
3360 | ||
3361 | static int ext4_setent(handle_t *handle, struct ext4_renament *ent, | |
3362 | unsigned ino, unsigned file_type) | |
3363 | { | |
3364 | int retval; | |
3365 | ||
3366 | BUFFER_TRACE(ent->bh, "get write access"); | |
3367 | retval = ext4_journal_get_write_access(handle, ent->bh); | |
3368 | if (retval) | |
3369 | return retval; | |
3370 | ent->de->inode = cpu_to_le32(ino); | |
e2b911c5 | 3371 | if (ext4_has_feature_filetype(ent->dir->i_sb)) |
bd1af145 MS |
3372 | ent->de->file_type = file_type; |
3373 | ent->dir->i_version++; | |
3374 | ent->dir->i_ctime = ent->dir->i_mtime = | |
eeca7ea1 | 3375 | current_time(ent->dir); |
bd1af145 MS |
3376 | ext4_mark_inode_dirty(handle, ent->dir); |
3377 | BUFFER_TRACE(ent->bh, "call ext4_handle_dirty_metadata"); | |
3378 | if (!ent->inlined) { | |
3379 | retval = ext4_handle_dirty_dirent_node(handle, | |
3380 | ent->dir, ent->bh); | |
3381 | if (unlikely(retval)) { | |
3382 | ext4_std_error(ent->dir->i_sb, retval); | |
3383 | return retval; | |
3384 | } | |
3385 | } | |
3386 | brelse(ent->bh); | |
3387 | ent->bh = NULL; | |
3388 | ||
3389 | return 0; | |
3390 | } | |
3391 | ||
3392 | static int ext4_find_delete_entry(handle_t *handle, struct inode *dir, | |
3393 | const struct qstr *d_name) | |
3394 | { | |
3395 | int retval = -ENOENT; | |
3396 | struct buffer_head *bh; | |
3397 | struct ext4_dir_entry_2 *de; | |
3398 | ||
3399 | bh = ext4_find_entry(dir, d_name, &de, NULL); | |
36de9286 TT |
3400 | if (IS_ERR(bh)) |
3401 | return PTR_ERR(bh); | |
bd1af145 MS |
3402 | if (bh) { |
3403 | retval = ext4_delete_entry(handle, dir, de, bh); | |
3404 | brelse(bh); | |
3405 | } | |
3406 | return retval; | |
3407 | } | |
3408 | ||
d80d448c DW |
3409 | static void ext4_rename_delete(handle_t *handle, struct ext4_renament *ent, |
3410 | int force_reread) | |
bd1af145 MS |
3411 | { |
3412 | int retval; | |
3413 | /* | |
3414 | * ent->de could have moved from under us during htree split, so make | |
3415 | * sure that we are deleting the right entry. We might also be pointing | |
3416 | * to a stale entry in the unused part of ent->bh so just checking inum | |
3417 | * and the name isn't enough. | |
3418 | */ | |
3419 | if (le32_to_cpu(ent->de->inode) != ent->inode->i_ino || | |
3420 | ent->de->name_len != ent->dentry->d_name.len || | |
3421 | strncmp(ent->de->name, ent->dentry->d_name.name, | |
d80d448c DW |
3422 | ent->de->name_len) || |
3423 | force_reread) { | |
bd1af145 MS |
3424 | retval = ext4_find_delete_entry(handle, ent->dir, |
3425 | &ent->dentry->d_name); | |
3426 | } else { | |
3427 | retval = ext4_delete_entry(handle, ent->dir, ent->de, ent->bh); | |
3428 | if (retval == -ENOENT) { | |
3429 | retval = ext4_find_delete_entry(handle, ent->dir, | |
3430 | &ent->dentry->d_name); | |
3431 | } | |
3432 | } | |
3433 | ||
3434 | if (retval) { | |
b03a2f7e AD |
3435 | ext4_warning_inode(ent->dir, |
3436 | "Deleting old file: nlink %d, error=%d", | |
3437 | ent->dir->i_nlink, retval); | |
bd1af145 MS |
3438 | } |
3439 | } | |
3440 | ||
bd42998a MS |
3441 | static void ext4_update_dir_count(handle_t *handle, struct ext4_renament *ent) |
3442 | { | |
3443 | if (ent->dir_nlink_delta) { | |
3444 | if (ent->dir_nlink_delta == -1) | |
3445 | ext4_dec_count(handle, ent->dir); | |
3446 | else | |
3447 | ext4_inc_count(handle, ent->dir); | |
3448 | ext4_mark_inode_dirty(handle, ent->dir); | |
3449 | } | |
3450 | } | |
3451 | ||
cd808dec MS |
3452 | static struct inode *ext4_whiteout_for_rename(struct ext4_renament *ent, |
3453 | int credits, handle_t **h) | |
3454 | { | |
3455 | struct inode *wh; | |
3456 | handle_t *handle; | |
3457 | int retries = 0; | |
3458 | ||
3459 | /* | |
3460 | * for inode block, sb block, group summaries, | |
3461 | * and inode bitmap | |
3462 | */ | |
3463 | credits += (EXT4_MAXQUOTAS_TRANS_BLOCKS(ent->dir->i_sb) + | |
3464 | EXT4_XATTR_TRANS_BLOCKS + 4); | |
3465 | retry: | |
3466 | wh = ext4_new_inode_start_handle(ent->dir, S_IFCHR | WHITEOUT_MODE, | |
3467 | &ent->dentry->d_name, 0, NULL, | |
3468 | EXT4_HT_DIR, credits); | |
3469 | ||
3470 | handle = ext4_journal_current_handle(); | |
3471 | if (IS_ERR(wh)) { | |
3472 | if (handle) | |
3473 | ext4_journal_stop(handle); | |
3474 | if (PTR_ERR(wh) == -ENOSPC && | |
3475 | ext4_should_retry_alloc(ent->dir->i_sb, &retries)) | |
3476 | goto retry; | |
3477 | } else { | |
3478 | *h = handle; | |
3479 | init_special_inode(wh, wh->i_mode, WHITEOUT_DEV); | |
3480 | wh->i_op = &ext4_special_inode_operations; | |
3481 | } | |
3482 | return wh; | |
3483 | } | |
3484 | ||
ac27a0ec DK |
3485 | /* |
3486 | * Anybody can rename anything with this: the permission checks are left to the | |
3487 | * higher-level routines. | |
0e202704 TT |
3488 | * |
3489 | * n.b. old_{dentry,inode) refers to the source dentry/inode | |
3490 | * while new_{dentry,inode) refers to the destination dentry/inode | |
3491 | * This comes from rename(const char *oldpath, const char *newpath) | |
ac27a0ec | 3492 | */ |
af5bc92d | 3493 | static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry, |
cd808dec MS |
3494 | struct inode *new_dir, struct dentry *new_dentry, |
3495 | unsigned int flags) | |
ac27a0ec | 3496 | { |
5b61de75 | 3497 | handle_t *handle = NULL; |
c0d268c3 MS |
3498 | struct ext4_renament old = { |
3499 | .dir = old_dir, | |
3500 | .dentry = old_dentry, | |
2b0143b5 | 3501 | .inode = d_inode(old_dentry), |
c0d268c3 MS |
3502 | }; |
3503 | struct ext4_renament new = { | |
3504 | .dir = new_dir, | |
3505 | .dentry = new_dentry, | |
2b0143b5 | 3506 | .inode = d_inode(new_dentry), |
c0d268c3 | 3507 | }; |
d80d448c | 3508 | int force_reread; |
0e202704 | 3509 | int retval; |
cd808dec MS |
3510 | struct inode *whiteout = NULL; |
3511 | int credits; | |
3512 | u8 old_file_type; | |
907f4554 | 3513 | |
040cb378 LX |
3514 | if ((ext4_test_inode_flag(new_dir, EXT4_INODE_PROJINHERIT)) && |
3515 | (!projid_eq(EXT4_I(new_dir)->i_projid, | |
3516 | EXT4_I(old_dentry->d_inode)->i_projid))) | |
3517 | return -EXDEV; | |
3518 | ||
173b8439 TT |
3519 | if ((ext4_encrypted_inode(old_dir) && |
3520 | !fscrypt_has_encryption_key(old_dir)) || | |
3521 | (ext4_encrypted_inode(new_dir) && | |
3522 | !fscrypt_has_encryption_key(new_dir))) | |
3523 | return -ENOKEY; | |
3524 | ||
a7cdadee JK |
3525 | retval = dquot_initialize(old.dir); |
3526 | if (retval) | |
3527 | return retval; | |
3528 | retval = dquot_initialize(new.dir); | |
3529 | if (retval) | |
3530 | return retval; | |
ac27a0ec DK |
3531 | |
3532 | /* Initialize quotas before so that eventual writes go | |
3533 | * in separate transaction */ | |
a7cdadee JK |
3534 | if (new.inode) { |
3535 | retval = dquot_initialize(new.inode); | |
3536 | if (retval) | |
3537 | return retval; | |
3538 | } | |
ac27a0ec | 3539 | |
c0d268c3 | 3540 | old.bh = ext4_find_entry(old.dir, &old.dentry->d_name, &old.de, NULL); |
36de9286 TT |
3541 | if (IS_ERR(old.bh)) |
3542 | return PTR_ERR(old.bh); | |
ac27a0ec DK |
3543 | /* |
3544 | * Check for inode number is _not_ due to possible IO errors. | |
3545 | * We might rmdir the source, keep it as pwd of some process | |
3546 | * and merrily kill the link to whatever was created under the | |
3547 | * same name. Goodbye sticky bit ;-< | |
3548 | */ | |
ac27a0ec | 3549 | retval = -ENOENT; |
c0d268c3 | 3550 | if (!old.bh || le32_to_cpu(old.de->inode) != old.inode->i_ino) |
ac27a0ec DK |
3551 | goto end_rename; |
3552 | ||
d9cdc903 TT |
3553 | if ((old.dir != new.dir) && |
3554 | ext4_encrypted_inode(new.dir) && | |
a7550b30 | 3555 | !fscrypt_has_permitted_context(new.dir, old.inode)) { |
d9cdc903 TT |
3556 | retval = -EPERM; |
3557 | goto end_rename; | |
3558 | } | |
3559 | ||
c0d268c3 MS |
3560 | new.bh = ext4_find_entry(new.dir, &new.dentry->d_name, |
3561 | &new.de, &new.inlined); | |
36de9286 TT |
3562 | if (IS_ERR(new.bh)) { |
3563 | retval = PTR_ERR(new.bh); | |
a9cfcd63 | 3564 | new.bh = NULL; |
36de9286 TT |
3565 | goto end_rename; |
3566 | } | |
c0d268c3 MS |
3567 | if (new.bh) { |
3568 | if (!new.inode) { | |
3569 | brelse(new.bh); | |
3570 | new.bh = NULL; | |
ac27a0ec DK |
3571 | } |
3572 | } | |
c0d268c3 MS |
3573 | if (new.inode && !test_opt(new.dir->i_sb, NO_AUTO_DA_ALLOC)) |
3574 | ext4_alloc_da_blocks(old.inode); | |
5b61de75 | 3575 | |
cd808dec MS |
3576 | credits = (2 * EXT4_DATA_TRANS_BLOCKS(old.dir->i_sb) + |
3577 | EXT4_INDEX_EXTRA_TRANS_BLOCKS + 2); | |
3578 | if (!(flags & RENAME_WHITEOUT)) { | |
3579 | handle = ext4_journal_start(old.dir, EXT4_HT_DIR, credits); | |
7071b715 KK |
3580 | if (IS_ERR(handle)) { |
3581 | retval = PTR_ERR(handle); | |
3582 | handle = NULL; | |
3583 | goto end_rename; | |
3584 | } | |
cd808dec MS |
3585 | } else { |
3586 | whiteout = ext4_whiteout_for_rename(&old, credits, &handle); | |
7071b715 KK |
3587 | if (IS_ERR(whiteout)) { |
3588 | retval = PTR_ERR(whiteout); | |
3589 | whiteout = NULL; | |
3590 | goto end_rename; | |
3591 | } | |
cd808dec | 3592 | } |
5b61de75 | 3593 | |
c0d268c3 | 3594 | if (IS_DIRSYNC(old.dir) || IS_DIRSYNC(new.dir)) |
5b61de75 TT |
3595 | ext4_handle_sync(handle); |
3596 | ||
c0d268c3 MS |
3597 | if (S_ISDIR(old.inode->i_mode)) { |
3598 | if (new.inode) { | |
ac27a0ec | 3599 | retval = -ENOTEMPTY; |
e875a2dd | 3600 | if (!ext4_empty_dir(new.inode)) |
ac27a0ec | 3601 | goto end_rename; |
0d7d5d67 MS |
3602 | } else { |
3603 | retval = -EMLINK; | |
3604 | if (new.dir != old.dir && EXT4_DIR_LINK_MAX(new.dir)) | |
3605 | goto end_rename; | |
ac27a0ec | 3606 | } |
bd1af145 | 3607 | retval = ext4_rename_dir_prepare(handle, &old); |
ef607893 AG |
3608 | if (retval) |
3609 | goto end_rename; | |
ac27a0ec | 3610 | } |
d80d448c DW |
3611 | /* |
3612 | * If we're renaming a file within an inline_data dir and adding or | |
3613 | * setting the new dirent causes a conversion from inline_data to | |
3614 | * extents/blockmap, we need to force the dirent delete code to | |
3615 | * re-read the directory, or else we end up trying to delete a dirent | |
3616 | * from what is now the extent tree root (or a block map). | |
3617 | */ | |
3618 | force_reread = (new.dir->i_ino == old.dir->i_ino && | |
3619 | ext4_test_inode_flag(new.dir, EXT4_INODE_INLINE_DATA)); | |
cd808dec MS |
3620 | |
3621 | old_file_type = old.de->file_type; | |
3622 | if (whiteout) { | |
3623 | /* | |
3624 | * Do this before adding a new entry, so the old entry is sure | |
3625 | * to be still pointing to the valid old entry. | |
3626 | */ | |
3627 | retval = ext4_setent(handle, &old, whiteout->i_ino, | |
3628 | EXT4_FT_CHRDEV); | |
3629 | if (retval) | |
3630 | goto end_rename; | |
3631 | ext4_mark_inode_dirty(handle, whiteout); | |
3632 | } | |
c0d268c3 MS |
3633 | if (!new.bh) { |
3634 | retval = ext4_add_entry(handle, new.dentry, old.inode); | |
ac27a0ec DK |
3635 | if (retval) |
3636 | goto end_rename; | |
3637 | } else { | |
bd1af145 | 3638 | retval = ext4_setent(handle, &new, |
cd808dec | 3639 | old.inode->i_ino, old_file_type); |
ef607893 AG |
3640 | if (retval) |
3641 | goto end_rename; | |
ac27a0ec | 3642 | } |
d80d448c DW |
3643 | if (force_reread) |
3644 | force_reread = !ext4_test_inode_flag(new.dir, | |
3645 | EXT4_INODE_INLINE_DATA); | |
ac27a0ec DK |
3646 | |
3647 | /* | |
3648 | * Like most other Unix systems, set the ctime for inodes on a | |
3649 | * rename. | |
3650 | */ | |
eeca7ea1 | 3651 | old.inode->i_ctime = current_time(old.inode); |
c0d268c3 | 3652 | ext4_mark_inode_dirty(handle, old.inode); |
ac27a0ec | 3653 | |
cd808dec MS |
3654 | if (!whiteout) { |
3655 | /* | |
3656 | * ok, that's it | |
3657 | */ | |
3658 | ext4_rename_delete(handle, &old, force_reread); | |
3659 | } | |
ac27a0ec | 3660 | |
c0d268c3 MS |
3661 | if (new.inode) { |
3662 | ext4_dec_count(handle, new.inode); | |
eeca7ea1 | 3663 | new.inode->i_ctime = current_time(new.inode); |
ac27a0ec | 3664 | } |
eeca7ea1 | 3665 | old.dir->i_ctime = old.dir->i_mtime = current_time(old.dir); |
c0d268c3 MS |
3666 | ext4_update_dx_flag(old.dir); |
3667 | if (old.dir_bh) { | |
bd1af145 MS |
3668 | retval = ext4_rename_dir_finish(handle, &old, new.dir->i_ino); |
3669 | if (retval) | |
b4097142 | 3670 | goto end_rename; |
bd1af145 | 3671 | |
c0d268c3 MS |
3672 | ext4_dec_count(handle, old.dir); |
3673 | if (new.inode) { | |
e875a2dd MH |
3674 | /* checked ext4_empty_dir above, can't have another |
3675 | * parent, ext4_dec_count() won't work for many-linked | |
3676 | * dirs */ | |
c0d268c3 | 3677 | clear_nlink(new.inode); |
ac27a0ec | 3678 | } else { |
c0d268c3 MS |
3679 | ext4_inc_count(handle, new.dir); |
3680 | ext4_update_dx_flag(new.dir); | |
3681 | ext4_mark_inode_dirty(handle, new.dir); | |
ac27a0ec DK |
3682 | } |
3683 | } | |
c0d268c3 MS |
3684 | ext4_mark_inode_dirty(handle, old.dir); |
3685 | if (new.inode) { | |
3686 | ext4_mark_inode_dirty(handle, new.inode); | |
3687 | if (!new.inode->i_nlink) | |
3688 | ext4_orphan_add(handle, new.inode); | |
ac27a0ec DK |
3689 | } |
3690 | retval = 0; | |
3691 | ||
3692 | end_rename: | |
c0d268c3 MS |
3693 | brelse(old.dir_bh); |
3694 | brelse(old.bh); | |
3695 | brelse(new.bh); | |
cd808dec MS |
3696 | if (whiteout) { |
3697 | if (retval) | |
3698 | drop_nlink(whiteout); | |
3699 | unlock_new_inode(whiteout); | |
3700 | iput(whiteout); | |
3701 | } | |
5b61de75 TT |
3702 | if (handle) |
3703 | ext4_journal_stop(handle); | |
ac27a0ec DK |
3704 | return retval; |
3705 | } | |
3706 | ||
bd42998a MS |
3707 | static int ext4_cross_rename(struct inode *old_dir, struct dentry *old_dentry, |
3708 | struct inode *new_dir, struct dentry *new_dentry) | |
3709 | { | |
3710 | handle_t *handle = NULL; | |
3711 | struct ext4_renament old = { | |
3712 | .dir = old_dir, | |
3713 | .dentry = old_dentry, | |
2b0143b5 | 3714 | .inode = d_inode(old_dentry), |
bd42998a MS |
3715 | }; |
3716 | struct ext4_renament new = { | |
3717 | .dir = new_dir, | |
3718 | .dentry = new_dentry, | |
2b0143b5 | 3719 | .inode = d_inode(new_dentry), |
bd42998a MS |
3720 | }; |
3721 | u8 new_file_type; | |
3722 | int retval; | |
eeca7ea1 | 3723 | struct timespec ctime; |
bd42998a | 3724 | |
173b8439 TT |
3725 | if ((ext4_encrypted_inode(old_dir) && |
3726 | !fscrypt_has_encryption_key(old_dir)) || | |
3727 | (ext4_encrypted_inode(new_dir) && | |
3728 | !fscrypt_has_encryption_key(new_dir))) | |
3729 | return -ENOKEY; | |
3730 | ||
c2faccaf TT |
3731 | if ((ext4_encrypted_inode(old_dir) || |
3732 | ext4_encrypted_inode(new_dir)) && | |
3733 | (old_dir != new_dir) && | |
a7550b30 JK |
3734 | (!fscrypt_has_permitted_context(new_dir, old.inode) || |
3735 | !fscrypt_has_permitted_context(old_dir, new.inode))) | |
c2faccaf TT |
3736 | return -EPERM; |
3737 | ||
040cb378 LX |
3738 | if ((ext4_test_inode_flag(new_dir, EXT4_INODE_PROJINHERIT) && |
3739 | !projid_eq(EXT4_I(new_dir)->i_projid, | |
3740 | EXT4_I(old_dentry->d_inode)->i_projid)) || | |
3741 | (ext4_test_inode_flag(old_dir, EXT4_INODE_PROJINHERIT) && | |
3742 | !projid_eq(EXT4_I(old_dir)->i_projid, | |
3743 | EXT4_I(new_dentry->d_inode)->i_projid))) | |
3744 | return -EXDEV; | |
3745 | ||
a7cdadee JK |
3746 | retval = dquot_initialize(old.dir); |
3747 | if (retval) | |
3748 | return retval; | |
3749 | retval = dquot_initialize(new.dir); | |
3750 | if (retval) | |
3751 | return retval; | |
bd42998a MS |
3752 | |
3753 | old.bh = ext4_find_entry(old.dir, &old.dentry->d_name, | |
3754 | &old.de, &old.inlined); | |
36de9286 TT |
3755 | if (IS_ERR(old.bh)) |
3756 | return PTR_ERR(old.bh); | |
bd42998a MS |
3757 | /* |
3758 | * Check for inode number is _not_ due to possible IO errors. | |
3759 | * We might rmdir the source, keep it as pwd of some process | |
3760 | * and merrily kill the link to whatever was created under the | |
3761 | * same name. Goodbye sticky bit ;-< | |
3762 | */ | |
3763 | retval = -ENOENT; | |
3764 | if (!old.bh || le32_to_cpu(old.de->inode) != old.inode->i_ino) | |
3765 | goto end_rename; | |
3766 | ||
3767 | new.bh = ext4_find_entry(new.dir, &new.dentry->d_name, | |
3768 | &new.de, &new.inlined); | |
36de9286 TT |
3769 | if (IS_ERR(new.bh)) { |
3770 | retval = PTR_ERR(new.bh); | |
a9cfcd63 | 3771 | new.bh = NULL; |
36de9286 TT |
3772 | goto end_rename; |
3773 | } | |
bd42998a MS |
3774 | |
3775 | /* RENAME_EXCHANGE case: old *and* new must both exist */ | |
3776 | if (!new.bh || le32_to_cpu(new.de->inode) != new.inode->i_ino) | |
3777 | goto end_rename; | |
3778 | ||
3779 | handle = ext4_journal_start(old.dir, EXT4_HT_DIR, | |
3780 | (2 * EXT4_DATA_TRANS_BLOCKS(old.dir->i_sb) + | |
3781 | 2 * EXT4_INDEX_EXTRA_TRANS_BLOCKS + 2)); | |
7071b715 KK |
3782 | if (IS_ERR(handle)) { |
3783 | retval = PTR_ERR(handle); | |
3784 | handle = NULL; | |
3785 | goto end_rename; | |
3786 | } | |
bd42998a MS |
3787 | |
3788 | if (IS_DIRSYNC(old.dir) || IS_DIRSYNC(new.dir)) | |
3789 | ext4_handle_sync(handle); | |
3790 | ||
3791 | if (S_ISDIR(old.inode->i_mode)) { | |
3792 | old.is_dir = true; | |
3793 | retval = ext4_rename_dir_prepare(handle, &old); | |
3794 | if (retval) | |
3795 | goto end_rename; | |
3796 | } | |
3797 | if (S_ISDIR(new.inode->i_mode)) { | |
3798 | new.is_dir = true; | |
3799 | retval = ext4_rename_dir_prepare(handle, &new); | |
3800 | if (retval) | |
3801 | goto end_rename; | |
3802 | } | |
3803 | ||
3804 | /* | |
3805 | * Other than the special case of overwriting a directory, parents' | |
3806 | * nlink only needs to be modified if this is a cross directory rename. | |
3807 | */ | |
3808 | if (old.dir != new.dir && old.is_dir != new.is_dir) { | |
3809 | old.dir_nlink_delta = old.is_dir ? -1 : 1; | |
3810 | new.dir_nlink_delta = -old.dir_nlink_delta; | |
3811 | retval = -EMLINK; | |
3812 | if ((old.dir_nlink_delta > 0 && EXT4_DIR_LINK_MAX(old.dir)) || | |
3813 | (new.dir_nlink_delta > 0 && EXT4_DIR_LINK_MAX(new.dir))) | |
3814 | goto end_rename; | |
3815 | } | |
3816 | ||
3817 | new_file_type = new.de->file_type; | |
3818 | retval = ext4_setent(handle, &new, old.inode->i_ino, old.de->file_type); | |
3819 | if (retval) | |
3820 | goto end_rename; | |
3821 | ||
3822 | retval = ext4_setent(handle, &old, new.inode->i_ino, new_file_type); | |
3823 | if (retval) | |
3824 | goto end_rename; | |
3825 | ||
3826 | /* | |
3827 | * Like most other Unix systems, set the ctime for inodes on a | |
3828 | * rename. | |
3829 | */ | |
eeca7ea1 DD |
3830 | ctime = current_time(old.inode); |
3831 | old.inode->i_ctime = ctime; | |
3832 | new.inode->i_ctime = ctime; | |
bd42998a MS |
3833 | ext4_mark_inode_dirty(handle, old.inode); |
3834 | ext4_mark_inode_dirty(handle, new.inode); | |
3835 | ||
3836 | if (old.dir_bh) { | |
3837 | retval = ext4_rename_dir_finish(handle, &old, new.dir->i_ino); | |
3838 | if (retval) | |
3839 | goto end_rename; | |
3840 | } | |
3841 | if (new.dir_bh) { | |
3842 | retval = ext4_rename_dir_finish(handle, &new, old.dir->i_ino); | |
3843 | if (retval) | |
3844 | goto end_rename; | |
3845 | } | |
3846 | ext4_update_dir_count(handle, &old); | |
3847 | ext4_update_dir_count(handle, &new); | |
3848 | retval = 0; | |
3849 | ||
3850 | end_rename: | |
3851 | brelse(old.dir_bh); | |
3852 | brelse(new.dir_bh); | |
3853 | brelse(old.bh); | |
3854 | brelse(new.bh); | |
3855 | if (handle) | |
3856 | ext4_journal_stop(handle); | |
3857 | return retval; | |
3858 | } | |
3859 | ||
0a7c3937 MS |
3860 | static int ext4_rename2(struct inode *old_dir, struct dentry *old_dentry, |
3861 | struct inode *new_dir, struct dentry *new_dentry, | |
3862 | unsigned int flags) | |
3863 | { | |
0db1ff22 TT |
3864 | if (unlikely(ext4_forced_shutdown(EXT4_SB(old_dir->i_sb)))) |
3865 | return -EIO; | |
3866 | ||
cd808dec | 3867 | if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT)) |
0a7c3937 MS |
3868 | return -EINVAL; |
3869 | ||
bd42998a MS |
3870 | if (flags & RENAME_EXCHANGE) { |
3871 | return ext4_cross_rename(old_dir, old_dentry, | |
3872 | new_dir, new_dentry); | |
3873 | } | |
cd808dec MS |
3874 | |
3875 | return ext4_rename(old_dir, old_dentry, new_dir, new_dentry, flags); | |
0a7c3937 MS |
3876 | } |
3877 | ||
ac27a0ec DK |
3878 | /* |
3879 | * directories can handle most operations... | |
3880 | */ | |
754661f1 | 3881 | const struct inode_operations ext4_dir_inode_operations = { |
617ba13b MC |
3882 | .create = ext4_create, |
3883 | .lookup = ext4_lookup, | |
3884 | .link = ext4_link, | |
3885 | .unlink = ext4_unlink, | |
3886 | .symlink = ext4_symlink, | |
3887 | .mkdir = ext4_mkdir, | |
3888 | .rmdir = ext4_rmdir, | |
3889 | .mknod = ext4_mknod, | |
af51a2ac | 3890 | .tmpfile = ext4_tmpfile, |
2773bf00 | 3891 | .rename = ext4_rename2, |
617ba13b | 3892 | .setattr = ext4_setattr, |
99652ea5 | 3893 | .getattr = ext4_getattr, |
617ba13b | 3894 | .listxattr = ext4_listxattr, |
4e34e719 | 3895 | .get_acl = ext4_get_acl, |
64e178a7 | 3896 | .set_acl = ext4_set_acl, |
abc8746e | 3897 | .fiemap = ext4_fiemap, |
ac27a0ec DK |
3898 | }; |
3899 | ||
754661f1 | 3900 | const struct inode_operations ext4_special_inode_operations = { |
617ba13b | 3901 | .setattr = ext4_setattr, |
99652ea5 | 3902 | .getattr = ext4_getattr, |
617ba13b | 3903 | .listxattr = ext4_listxattr, |
4e34e719 | 3904 | .get_acl = ext4_get_acl, |
64e178a7 | 3905 | .set_acl = ext4_set_acl, |
ac27a0ec | 3906 | }; |