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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> | |
ae5e165d | 37 | #include <linux/iversion.h> |
3dcf5451 CH |
38 | #include "ext4.h" |
39 | #include "ext4_jbd2.h" | |
ac27a0ec | 40 | |
ac27a0ec DK |
41 | #include "xattr.h" |
42 | #include "acl.h" | |
43 | ||
0562e0ba | 44 | #include <trace/events/ext4.h> |
ac27a0ec DK |
45 | /* |
46 | * define how far ahead to read directories while searching them. | |
47 | */ | |
48 | #define NAMEI_RA_CHUNKS 2 | |
49 | #define NAMEI_RA_BLOCKS 4 | |
8c55e204 | 50 | #define NAMEI_RA_SIZE (NAMEI_RA_CHUNKS * NAMEI_RA_BLOCKS) |
ac27a0ec | 51 | |
617ba13b | 52 | static struct buffer_head *ext4_append(handle_t *handle, |
ac27a0ec | 53 | struct inode *inode, |
0f70b406 | 54 | ext4_lblk_t *block) |
ac27a0ec DK |
55 | { |
56 | struct buffer_head *bh; | |
1c215028 | 57 | int err; |
ac27a0ec | 58 | |
df981d03 TT |
59 | if (unlikely(EXT4_SB(inode->i_sb)->s_max_dir_size_kb && |
60 | ((inode->i_size >> 10) >= | |
0f70b406 TT |
61 | EXT4_SB(inode->i_sb)->s_max_dir_size_kb))) |
62 | return ERR_PTR(-ENOSPC); | |
df981d03 | 63 | |
ac27a0ec DK |
64 | *block = inode->i_size >> inode->i_sb->s_blocksize_bits; |
65 | ||
c5e298ae | 66 | bh = ext4_bread(handle, inode, *block, EXT4_GET_BLOCKS_CREATE); |
1c215028 TT |
67 | if (IS_ERR(bh)) |
68 | return bh; | |
0f70b406 TT |
69 | inode->i_size += inode->i_sb->s_blocksize; |
70 | EXT4_I(inode)->i_disksize = inode->i_size; | |
5d601255 | 71 | BUFFER_TRACE(bh, "get_write_access"); |
0f70b406 TT |
72 | err = ext4_journal_get_write_access(handle, bh); |
73 | if (err) { | |
74 | brelse(bh); | |
75 | ext4_std_error(inode->i_sb, err); | |
76 | return ERR_PTR(err); | |
6d1ab10e | 77 | } |
ac27a0ec DK |
78 | return bh; |
79 | } | |
80 | ||
dc6982ff TT |
81 | static int ext4_dx_csum_verify(struct inode *inode, |
82 | struct ext4_dir_entry *dirent); | |
83 | ||
84 | typedef enum { | |
85 | EITHER, INDEX, DIRENT | |
86 | } dirblock_type_t; | |
87 | ||
88 | #define ext4_read_dirblock(inode, block, type) \ | |
b03a2f7e | 89 | __ext4_read_dirblock((inode), (block), (type), __func__, __LINE__) |
dc6982ff TT |
90 | |
91 | static struct buffer_head *__ext4_read_dirblock(struct inode *inode, | |
b03a2f7e AD |
92 | ext4_lblk_t block, |
93 | dirblock_type_t type, | |
94 | const char *func, | |
95 | unsigned int line) | |
dc6982ff TT |
96 | { |
97 | struct buffer_head *bh; | |
98 | struct ext4_dir_entry *dirent; | |
1c215028 | 99 | int is_dx_block = 0; |
dc6982ff | 100 | |
1c215028 TT |
101 | bh = ext4_bread(NULL, inode, block, 0); |
102 | if (IS_ERR(bh)) { | |
b03a2f7e AD |
103 | __ext4_warning(inode->i_sb, func, line, |
104 | "inode #%lu: lblock %lu: comm %s: " | |
105 | "error %ld reading directory block", | |
106 | inode->i_ino, (unsigned long)block, | |
107 | current->comm, PTR_ERR(bh)); | |
1c215028 TT |
108 | |
109 | return bh; | |
110 | } | |
111 | if (!bh) { | |
b03a2f7e AD |
112 | ext4_error_inode(inode, func, line, block, |
113 | "Directory hole found"); | |
6a797d27 | 114 | return ERR_PTR(-EFSCORRUPTED); |
dc6982ff TT |
115 | } |
116 | dirent = (struct ext4_dir_entry *) bh->b_data; | |
117 | /* Determine whether or not we have an index block */ | |
118 | if (is_dx(inode)) { | |
119 | if (block == 0) | |
120 | is_dx_block = 1; | |
121 | else if (ext4_rec_len_from_disk(dirent->rec_len, | |
122 | inode->i_sb->s_blocksize) == | |
123 | inode->i_sb->s_blocksize) | |
124 | is_dx_block = 1; | |
125 | } | |
126 | if (!is_dx_block && type == INDEX) { | |
b03a2f7e | 127 | ext4_error_inode(inode, func, line, block, |
dc6982ff | 128 | "directory leaf block found instead of index block"); |
6a797d27 | 129 | return ERR_PTR(-EFSCORRUPTED); |
dc6982ff | 130 | } |
9aa5d32b | 131 | if (!ext4_has_metadata_csum(inode->i_sb) || |
dc6982ff TT |
132 | buffer_verified(bh)) |
133 | return bh; | |
134 | ||
135 | /* | |
136 | * An empty leaf block can get mistaken for a index block; for | |
137 | * this reason, we can only check the index checksum when the | |
138 | * caller is sure it should be an index block. | |
139 | */ | |
140 | if (is_dx_block && type == INDEX) { | |
141 | if (ext4_dx_csum_verify(inode, dirent)) | |
142 | set_buffer_verified(bh); | |
143 | else { | |
b03a2f7e AD |
144 | ext4_error_inode(inode, func, line, block, |
145 | "Directory index failed checksum"); | |
a871611b | 146 | brelse(bh); |
6a797d27 | 147 | return ERR_PTR(-EFSBADCRC); |
a871611b | 148 | } |
ac27a0ec | 149 | } |
dc6982ff TT |
150 | if (!is_dx_block) { |
151 | if (ext4_dirent_csum_verify(inode, dirent)) | |
152 | set_buffer_verified(bh); | |
153 | else { | |
b03a2f7e AD |
154 | ext4_error_inode(inode, func, line, block, |
155 | "Directory block failed checksum"); | |
dc6982ff | 156 | brelse(bh); |
6a797d27 | 157 | return ERR_PTR(-EFSBADCRC); |
dc6982ff | 158 | } |
6d1ab10e | 159 | } |
ac27a0ec DK |
160 | return bh; |
161 | } | |
162 | ||
163 | #ifndef assert | |
164 | #define assert(test) J_ASSERT(test) | |
165 | #endif | |
166 | ||
ac27a0ec DK |
167 | #ifdef DX_DEBUG |
168 | #define dxtrace(command) command | |
169 | #else | |
170 | #define dxtrace(command) | |
171 | #endif | |
172 | ||
173 | struct fake_dirent | |
174 | { | |
175 | __le32 inode; | |
176 | __le16 rec_len; | |
177 | u8 name_len; | |
178 | u8 file_type; | |
179 | }; | |
180 | ||
181 | struct dx_countlimit | |
182 | { | |
183 | __le16 limit; | |
184 | __le16 count; | |
185 | }; | |
186 | ||
187 | struct dx_entry | |
188 | { | |
189 | __le32 hash; | |
190 | __le32 block; | |
191 | }; | |
192 | ||
193 | /* | |
194 | * dx_root_info is laid out so that if it should somehow get overlaid by a | |
195 | * dirent the two low bits of the hash version will be zero. Therefore, the | |
196 | * hash version mod 4 should never be 0. Sincerely, the paranoia department. | |
197 | */ | |
198 | ||
199 | struct dx_root | |
200 | { | |
201 | struct fake_dirent dot; | |
202 | char dot_name[4]; | |
203 | struct fake_dirent dotdot; | |
204 | char dotdot_name[4]; | |
205 | struct dx_root_info | |
206 | { | |
207 | __le32 reserved_zero; | |
208 | u8 hash_version; | |
209 | u8 info_length; /* 8 */ | |
210 | u8 indirect_levels; | |
211 | u8 unused_flags; | |
212 | } | |
213 | info; | |
214 | struct dx_entry entries[0]; | |
215 | }; | |
216 | ||
217 | struct dx_node | |
218 | { | |
219 | struct fake_dirent fake; | |
220 | struct dx_entry entries[0]; | |
221 | }; | |
222 | ||
223 | ||
224 | struct dx_frame | |
225 | { | |
226 | struct buffer_head *bh; | |
227 | struct dx_entry *entries; | |
228 | struct dx_entry *at; | |
229 | }; | |
230 | ||
231 | struct dx_map_entry | |
232 | { | |
233 | u32 hash; | |
ef2b02d3 ES |
234 | u16 offs; |
235 | u16 size; | |
ac27a0ec DK |
236 | }; |
237 | ||
e6153918 DW |
238 | /* |
239 | * This goes at the end of each htree block. | |
240 | */ | |
241 | struct dx_tail { | |
242 | u32 dt_reserved; | |
243 | __le32 dt_checksum; /* crc32c(uuid+inum+dirblock) */ | |
244 | }; | |
245 | ||
725d26d3 AK |
246 | static inline ext4_lblk_t dx_get_block(struct dx_entry *entry); |
247 | static void dx_set_block(struct dx_entry *entry, ext4_lblk_t value); | |
af5bc92d TT |
248 | static inline unsigned dx_get_hash(struct dx_entry *entry); |
249 | static void dx_set_hash(struct dx_entry *entry, unsigned value); | |
250 | static unsigned dx_get_count(struct dx_entry *entries); | |
251 | static unsigned dx_get_limit(struct dx_entry *entries); | |
252 | static void dx_set_count(struct dx_entry *entries, unsigned value); | |
253 | static void dx_set_limit(struct dx_entry *entries, unsigned value); | |
254 | static unsigned dx_root_limit(struct inode *dir, unsigned infosize); | |
255 | static unsigned dx_node_limit(struct inode *dir); | |
5b643f9c | 256 | static struct dx_frame *dx_probe(struct ext4_filename *fname, |
ac27a0ec DK |
257 | struct inode *dir, |
258 | struct dx_hash_info *hinfo, | |
dd73b5d5 | 259 | struct dx_frame *frame); |
af5bc92d | 260 | static void dx_release(struct dx_frame *frames); |
1f3862b5 MH |
261 | static int dx_make_map(struct inode *dir, struct ext4_dir_entry_2 *de, |
262 | unsigned blocksize, struct dx_hash_info *hinfo, | |
263 | struct dx_map_entry map[]); | |
ac27a0ec | 264 | static void dx_sort_map(struct dx_map_entry *map, unsigned count); |
af5bc92d | 265 | static struct ext4_dir_entry_2 *dx_move_dirents(char *from, char *to, |
3d0518f4 | 266 | struct dx_map_entry *offsets, int count, unsigned blocksize); |
8bad4597 | 267 | static struct ext4_dir_entry_2* dx_pack_dirents(char *base, unsigned blocksize); |
725d26d3 AK |
268 | static void dx_insert_block(struct dx_frame *frame, |
269 | u32 hash, ext4_lblk_t block); | |
617ba13b | 270 | static int ext4_htree_next_block(struct inode *dir, __u32 hash, |
ac27a0ec DK |
271 | struct dx_frame *frame, |
272 | struct dx_frame *frames, | |
273 | __u32 *start_hash); | |
f702ba0f | 274 | static struct buffer_head * ext4_dx_find_entry(struct inode *dir, |
5b643f9c | 275 | struct ext4_filename *fname, |
537d8f93 | 276 | struct ext4_dir_entry_2 **res_dir); |
5b643f9c | 277 | static int ext4_dx_add_entry(handle_t *handle, struct ext4_filename *fname, |
56a04915 | 278 | struct inode *dir, struct inode *inode); |
ac27a0ec | 279 | |
dbe89444 | 280 | /* checksumming functions */ |
3c47d541 TM |
281 | void initialize_dirent_tail(struct ext4_dir_entry_tail *t, |
282 | unsigned int blocksize) | |
b0336e8d DW |
283 | { |
284 | memset(t, 0, sizeof(struct ext4_dir_entry_tail)); | |
285 | t->det_rec_len = ext4_rec_len_to_disk( | |
286 | sizeof(struct ext4_dir_entry_tail), blocksize); | |
287 | t->det_reserved_ft = EXT4_FT_DIR_CSUM; | |
288 | } | |
289 | ||
290 | /* Walk through a dirent block to find a checksum "dirent" at the tail */ | |
291 | static struct ext4_dir_entry_tail *get_dirent_tail(struct inode *inode, | |
292 | struct ext4_dir_entry *de) | |
293 | { | |
294 | struct ext4_dir_entry_tail *t; | |
295 | ||
296 | #ifdef PARANOID | |
297 | struct ext4_dir_entry *d, *top; | |
298 | ||
299 | d = de; | |
300 | top = (struct ext4_dir_entry *)(((void *)de) + | |
301 | (EXT4_BLOCK_SIZE(inode->i_sb) - | |
302 | sizeof(struct ext4_dir_entry_tail))); | |
303 | while (d < top && d->rec_len) | |
304 | d = (struct ext4_dir_entry *)(((void *)d) + | |
305 | le16_to_cpu(d->rec_len)); | |
306 | ||
307 | if (d != top) | |
308 | return NULL; | |
309 | ||
310 | t = (struct ext4_dir_entry_tail *)d; | |
311 | #else | |
312 | t = EXT4_DIRENT_TAIL(de, EXT4_BLOCK_SIZE(inode->i_sb)); | |
313 | #endif | |
314 | ||
315 | if (t->det_reserved_zero1 || | |
316 | le16_to_cpu(t->det_rec_len) != sizeof(struct ext4_dir_entry_tail) || | |
317 | t->det_reserved_zero2 || | |
318 | t->det_reserved_ft != EXT4_FT_DIR_CSUM) | |
319 | return NULL; | |
320 | ||
321 | return t; | |
322 | } | |
323 | ||
324 | static __le32 ext4_dirent_csum(struct inode *inode, | |
325 | struct ext4_dir_entry *dirent, int size) | |
326 | { | |
327 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
328 | struct ext4_inode_info *ei = EXT4_I(inode); | |
329 | __u32 csum; | |
330 | ||
331 | csum = ext4_chksum(sbi, ei->i_csum_seed, (__u8 *)dirent, size); | |
332 | return cpu_to_le32(csum); | |
333 | } | |
334 | ||
b03a2f7e AD |
335 | #define warn_no_space_for_csum(inode) \ |
336 | __warn_no_space_for_csum((inode), __func__, __LINE__) | |
337 | ||
338 | static void __warn_no_space_for_csum(struct inode *inode, const char *func, | |
339 | unsigned int line) | |
dffe9d8d | 340 | { |
b03a2f7e AD |
341 | __ext4_warning_inode(inode, func, line, |
342 | "No space for directory leaf checksum. Please run e2fsck -D."); | |
dffe9d8d TT |
343 | } |
344 | ||
b0336e8d DW |
345 | int ext4_dirent_csum_verify(struct inode *inode, struct ext4_dir_entry *dirent) |
346 | { | |
347 | struct ext4_dir_entry_tail *t; | |
348 | ||
9aa5d32b | 349 | if (!ext4_has_metadata_csum(inode->i_sb)) |
b0336e8d DW |
350 | return 1; |
351 | ||
352 | t = get_dirent_tail(inode, dirent); | |
353 | if (!t) { | |
dffe9d8d | 354 | warn_no_space_for_csum(inode); |
b0336e8d DW |
355 | return 0; |
356 | } | |
357 | ||
358 | if (t->det_checksum != ext4_dirent_csum(inode, dirent, | |
359 | (void *)t - (void *)dirent)) | |
360 | return 0; | |
361 | ||
362 | return 1; | |
363 | } | |
364 | ||
365 | static void ext4_dirent_csum_set(struct inode *inode, | |
366 | struct ext4_dir_entry *dirent) | |
367 | { | |
368 | struct ext4_dir_entry_tail *t; | |
369 | ||
9aa5d32b | 370 | if (!ext4_has_metadata_csum(inode->i_sb)) |
b0336e8d DW |
371 | return; |
372 | ||
373 | t = get_dirent_tail(inode, dirent); | |
374 | if (!t) { | |
dffe9d8d | 375 | warn_no_space_for_csum(inode); |
b0336e8d DW |
376 | return; |
377 | } | |
378 | ||
379 | t->det_checksum = ext4_dirent_csum(inode, dirent, | |
380 | (void *)t - (void *)dirent); | |
381 | } | |
382 | ||
3c47d541 TM |
383 | int ext4_handle_dirty_dirent_node(handle_t *handle, |
384 | struct inode *inode, | |
385 | struct buffer_head *bh) | |
b0336e8d DW |
386 | { |
387 | ext4_dirent_csum_set(inode, (struct ext4_dir_entry *)bh->b_data); | |
388 | return ext4_handle_dirty_metadata(handle, inode, bh); | |
389 | } | |
390 | ||
dbe89444 DW |
391 | static struct dx_countlimit *get_dx_countlimit(struct inode *inode, |
392 | struct ext4_dir_entry *dirent, | |
393 | int *offset) | |
394 | { | |
395 | struct ext4_dir_entry *dp; | |
396 | struct dx_root_info *root; | |
397 | int count_offset; | |
398 | ||
399 | if (le16_to_cpu(dirent->rec_len) == EXT4_BLOCK_SIZE(inode->i_sb)) | |
400 | count_offset = 8; | |
401 | else if (le16_to_cpu(dirent->rec_len) == 12) { | |
402 | dp = (struct ext4_dir_entry *)(((void *)dirent) + 12); | |
403 | if (le16_to_cpu(dp->rec_len) != | |
404 | EXT4_BLOCK_SIZE(inode->i_sb) - 12) | |
405 | return NULL; | |
406 | root = (struct dx_root_info *)(((void *)dp + 12)); | |
407 | if (root->reserved_zero || | |
408 | root->info_length != sizeof(struct dx_root_info)) | |
409 | return NULL; | |
410 | count_offset = 32; | |
411 | } else | |
412 | return NULL; | |
413 | ||
414 | if (offset) | |
415 | *offset = count_offset; | |
416 | return (struct dx_countlimit *)(((void *)dirent) + count_offset); | |
417 | } | |
418 | ||
419 | static __le32 ext4_dx_csum(struct inode *inode, struct ext4_dir_entry *dirent, | |
420 | int count_offset, int count, struct dx_tail *t) | |
421 | { | |
422 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
423 | struct ext4_inode_info *ei = EXT4_I(inode); | |
d6a77105 | 424 | __u32 csum; |
dbe89444 | 425 | int size; |
b47820ed DJ |
426 | __u32 dummy_csum = 0; |
427 | int offset = offsetof(struct dx_tail, dt_checksum); | |
dbe89444 DW |
428 | |
429 | size = count_offset + (count * sizeof(struct dx_entry)); | |
dbe89444 | 430 | csum = ext4_chksum(sbi, ei->i_csum_seed, (__u8 *)dirent, size); |
b47820ed DJ |
431 | csum = ext4_chksum(sbi, csum, (__u8 *)t, offset); |
432 | csum = ext4_chksum(sbi, csum, (__u8 *)&dummy_csum, sizeof(dummy_csum)); | |
dbe89444 DW |
433 | |
434 | return cpu_to_le32(csum); | |
435 | } | |
436 | ||
437 | static int ext4_dx_csum_verify(struct inode *inode, | |
438 | struct ext4_dir_entry *dirent) | |
439 | { | |
440 | struct dx_countlimit *c; | |
441 | struct dx_tail *t; | |
442 | int count_offset, limit, count; | |
443 | ||
9aa5d32b | 444 | if (!ext4_has_metadata_csum(inode->i_sb)) |
dbe89444 DW |
445 | return 1; |
446 | ||
447 | c = get_dx_countlimit(inode, dirent, &count_offset); | |
448 | if (!c) { | |
449 | EXT4_ERROR_INODE(inode, "dir seems corrupt? Run e2fsck -D."); | |
fa964540 | 450 | return 0; |
dbe89444 DW |
451 | } |
452 | limit = le16_to_cpu(c->limit); | |
453 | count = le16_to_cpu(c->count); | |
454 | if (count_offset + (limit * sizeof(struct dx_entry)) > | |
455 | EXT4_BLOCK_SIZE(inode->i_sb) - sizeof(struct dx_tail)) { | |
dffe9d8d | 456 | warn_no_space_for_csum(inode); |
fa964540 | 457 | return 0; |
dbe89444 DW |
458 | } |
459 | t = (struct dx_tail *)(((struct dx_entry *)c) + limit); | |
460 | ||
461 | if (t->dt_checksum != ext4_dx_csum(inode, dirent, count_offset, | |
462 | count, t)) | |
463 | return 0; | |
464 | return 1; | |
465 | } | |
466 | ||
467 | static void ext4_dx_csum_set(struct inode *inode, struct ext4_dir_entry *dirent) | |
468 | { | |
469 | struct dx_countlimit *c; | |
470 | struct dx_tail *t; | |
471 | int count_offset, limit, count; | |
472 | ||
9aa5d32b | 473 | if (!ext4_has_metadata_csum(inode->i_sb)) |
dbe89444 DW |
474 | return; |
475 | ||
476 | c = get_dx_countlimit(inode, dirent, &count_offset); | |
477 | if (!c) { | |
478 | EXT4_ERROR_INODE(inode, "dir seems corrupt? Run e2fsck -D."); | |
479 | return; | |
480 | } | |
481 | limit = le16_to_cpu(c->limit); | |
482 | count = le16_to_cpu(c->count); | |
483 | if (count_offset + (limit * sizeof(struct dx_entry)) > | |
484 | EXT4_BLOCK_SIZE(inode->i_sb) - sizeof(struct dx_tail)) { | |
dffe9d8d | 485 | warn_no_space_for_csum(inode); |
dbe89444 DW |
486 | return; |
487 | } | |
488 | t = (struct dx_tail *)(((struct dx_entry *)c) + limit); | |
489 | ||
490 | t->dt_checksum = ext4_dx_csum(inode, dirent, count_offset, count, t); | |
491 | } | |
492 | ||
493 | static inline int ext4_handle_dirty_dx_node(handle_t *handle, | |
494 | struct inode *inode, | |
495 | struct buffer_head *bh) | |
496 | { | |
497 | ext4_dx_csum_set(inode, (struct ext4_dir_entry *)bh->b_data); | |
498 | return ext4_handle_dirty_metadata(handle, inode, bh); | |
499 | } | |
500 | ||
f795e140 LZ |
501 | /* |
502 | * p is at least 6 bytes before the end of page | |
503 | */ | |
504 | static inline struct ext4_dir_entry_2 * | |
3d0518f4 | 505 | ext4_next_entry(struct ext4_dir_entry_2 *p, unsigned long blocksize) |
f795e140 LZ |
506 | { |
507 | return (struct ext4_dir_entry_2 *)((char *)p + | |
3d0518f4 | 508 | ext4_rec_len_from_disk(p->rec_len, blocksize)); |
f795e140 LZ |
509 | } |
510 | ||
ac27a0ec DK |
511 | /* |
512 | * Future: use high four bits of block for coalesce-on-delete flags | |
513 | * Mask them off for now. | |
514 | */ | |
515 | ||
725d26d3 | 516 | static inline ext4_lblk_t dx_get_block(struct dx_entry *entry) |
ac27a0ec | 517 | { |
e08ac99f | 518 | return le32_to_cpu(entry->block) & 0x0fffffff; |
ac27a0ec DK |
519 | } |
520 | ||
725d26d3 | 521 | static inline void dx_set_block(struct dx_entry *entry, ext4_lblk_t value) |
ac27a0ec DK |
522 | { |
523 | entry->block = cpu_to_le32(value); | |
524 | } | |
525 | ||
af5bc92d | 526 | static inline unsigned dx_get_hash(struct dx_entry *entry) |
ac27a0ec DK |
527 | { |
528 | return le32_to_cpu(entry->hash); | |
529 | } | |
530 | ||
af5bc92d | 531 | static inline void dx_set_hash(struct dx_entry *entry, unsigned value) |
ac27a0ec DK |
532 | { |
533 | entry->hash = cpu_to_le32(value); | |
534 | } | |
535 | ||
af5bc92d | 536 | static inline unsigned dx_get_count(struct dx_entry *entries) |
ac27a0ec DK |
537 | { |
538 | return le16_to_cpu(((struct dx_countlimit *) entries)->count); | |
539 | } | |
540 | ||
af5bc92d | 541 | static inline unsigned dx_get_limit(struct dx_entry *entries) |
ac27a0ec DK |
542 | { |
543 | return le16_to_cpu(((struct dx_countlimit *) entries)->limit); | |
544 | } | |
545 | ||
af5bc92d | 546 | static inline void dx_set_count(struct dx_entry *entries, unsigned value) |
ac27a0ec DK |
547 | { |
548 | ((struct dx_countlimit *) entries)->count = cpu_to_le16(value); | |
549 | } | |
550 | ||
af5bc92d | 551 | static inline void dx_set_limit(struct dx_entry *entries, unsigned value) |
ac27a0ec DK |
552 | { |
553 | ((struct dx_countlimit *) entries)->limit = cpu_to_le16(value); | |
554 | } | |
555 | ||
af5bc92d | 556 | static inline unsigned dx_root_limit(struct inode *dir, unsigned infosize) |
ac27a0ec | 557 | { |
617ba13b MC |
558 | unsigned entry_space = dir->i_sb->s_blocksize - EXT4_DIR_REC_LEN(1) - |
559 | EXT4_DIR_REC_LEN(2) - infosize; | |
dbe89444 | 560 | |
9aa5d32b | 561 | if (ext4_has_metadata_csum(dir->i_sb)) |
dbe89444 | 562 | entry_space -= sizeof(struct dx_tail); |
d9c769b7 | 563 | return entry_space / sizeof(struct dx_entry); |
ac27a0ec DK |
564 | } |
565 | ||
af5bc92d | 566 | static inline unsigned dx_node_limit(struct inode *dir) |
ac27a0ec | 567 | { |
617ba13b | 568 | unsigned entry_space = dir->i_sb->s_blocksize - EXT4_DIR_REC_LEN(0); |
dbe89444 | 569 | |
9aa5d32b | 570 | if (ext4_has_metadata_csum(dir->i_sb)) |
dbe89444 | 571 | entry_space -= sizeof(struct dx_tail); |
d9c769b7 | 572 | return entry_space / sizeof(struct dx_entry); |
ac27a0ec DK |
573 | } |
574 | ||
575 | /* | |
576 | * Debug | |
577 | */ | |
578 | #ifdef DX_DEBUG | |
4776004f | 579 | static void dx_show_index(char * label, struct dx_entry *entries) |
ac27a0ec | 580 | { |
63f57933 | 581 | int i, n = dx_get_count (entries); |
d74f3d25 | 582 | printk(KERN_DEBUG "%s index", label); |
63f57933 | 583 | for (i = 0; i < n; i++) { |
d74f3d25 JP |
584 | printk(KERN_CONT " %x->%lu", |
585 | i ? dx_get_hash(entries + i) : 0, | |
586 | (unsigned long)dx_get_block(entries + i)); | |
63f57933 | 587 | } |
d74f3d25 | 588 | printk(KERN_CONT "\n"); |
ac27a0ec DK |
589 | } |
590 | ||
591 | struct stats | |
592 | { | |
593 | unsigned names; | |
594 | unsigned space; | |
595 | unsigned bcount; | |
596 | }; | |
597 | ||
b3098486 MH |
598 | static struct stats dx_show_leaf(struct inode *dir, |
599 | struct dx_hash_info *hinfo, | |
600 | struct ext4_dir_entry_2 *de, | |
601 | int size, int show_names) | |
ac27a0ec DK |
602 | { |
603 | unsigned names = 0, space = 0; | |
604 | char *base = (char *) de; | |
605 | struct dx_hash_info h = *hinfo; | |
606 | ||
607 | printk("names: "); | |
608 | while ((char *) de < base + size) | |
609 | { | |
610 | if (de->inode) | |
611 | { | |
612 | if (show_names) | |
613 | { | |
b3098486 MH |
614 | #ifdef CONFIG_EXT4_FS_ENCRYPTION |
615 | int len; | |
616 | char *name; | |
a7550b30 JK |
617 | struct fscrypt_str fname_crypto_str = |
618 | FSTR_INIT(NULL, 0); | |
c936e1ec | 619 | int res = 0; |
b3098486 MH |
620 | |
621 | name = de->name; | |
622 | len = de->name_len; | |
a7550b30 JK |
623 | if (ext4_encrypted_inode(dir)) |
624 | res = fscrypt_get_encryption_info(dir); | |
b7236e21 TT |
625 | if (res) { |
626 | printk(KERN_WARNING "Error setting up" | |
627 | " fname crypto: %d\n", res); | |
b3098486 | 628 | } |
a7550b30 | 629 | if (!fscrypt_has_encryption_key(dir)) { |
b3098486 MH |
630 | /* Directory is not encrypted */ |
631 | ext4fs_dirhash(de->name, | |
632 | de->name_len, &h); | |
633 | printk("%*.s:(U)%x.%u ", len, | |
634 | name, h.hash, | |
635 | (unsigned) ((char *) de | |
636 | - base)); | |
637 | } else { | |
a7550b30 JK |
638 | struct fscrypt_str de_name = |
639 | FSTR_INIT(name, len); | |
640 | ||
b3098486 | 641 | /* Directory is encrypted */ |
a7550b30 JK |
642 | res = fscrypt_fname_alloc_buffer( |
643 | dir, len, | |
b3098486 | 644 | &fname_crypto_str); |
ef1eb3aa | 645 | if (res) |
b3098486 MH |
646 | printk(KERN_WARNING "Error " |
647 | "allocating crypto " | |
648 | "buffer--skipping " | |
649 | "crypto\n"); | |
a7550b30 JK |
650 | res = fscrypt_fname_disk_to_usr(dir, |
651 | 0, 0, &de_name, | |
652 | &fname_crypto_str); | |
ef1eb3aa | 653 | if (res) { |
b3098486 MH |
654 | printk(KERN_WARNING "Error " |
655 | "converting filename " | |
656 | "from disk to usr" | |
657 | "\n"); | |
658 | name = "??"; | |
659 | len = 2; | |
660 | } else { | |
661 | name = fname_crypto_str.name; | |
662 | len = fname_crypto_str.len; | |
663 | } | |
5de0b4d0 TT |
664 | ext4fs_dirhash(de->name, de->name_len, |
665 | &h); | |
b3098486 MH |
666 | printk("%*.s:(E)%x.%u ", len, name, |
667 | h.hash, (unsigned) ((char *) de | |
668 | - base)); | |
a7550b30 JK |
669 | fscrypt_fname_free_buffer( |
670 | &fname_crypto_str); | |
b3098486 MH |
671 | } |
672 | #else | |
ac27a0ec DK |
673 | int len = de->name_len; |
674 | char *name = de->name; | |
617ba13b | 675 | ext4fs_dirhash(de->name, de->name_len, &h); |
b3098486 | 676 | printk("%*.s:%x.%u ", len, name, h.hash, |
265c6a0f | 677 | (unsigned) ((char *) de - base)); |
b3098486 | 678 | #endif |
ac27a0ec | 679 | } |
617ba13b | 680 | space += EXT4_DIR_REC_LEN(de->name_len); |
ac27a0ec DK |
681 | names++; |
682 | } | |
3d0518f4 | 683 | de = ext4_next_entry(de, size); |
ac27a0ec | 684 | } |
d74f3d25 | 685 | printk(KERN_CONT "(%i)\n", names); |
ac27a0ec DK |
686 | return (struct stats) { names, space, 1 }; |
687 | } | |
688 | ||
689 | struct stats dx_show_entries(struct dx_hash_info *hinfo, struct inode *dir, | |
690 | struct dx_entry *entries, int levels) | |
691 | { | |
692 | unsigned blocksize = dir->i_sb->s_blocksize; | |
af5bc92d | 693 | unsigned count = dx_get_count(entries), names = 0, space = 0, i; |
ac27a0ec DK |
694 | unsigned bcount = 0; |
695 | struct buffer_head *bh; | |
ac27a0ec DK |
696 | printk("%i indexed blocks...\n", count); |
697 | for (i = 0; i < count; i++, entries++) | |
698 | { | |
725d26d3 AK |
699 | ext4_lblk_t block = dx_get_block(entries); |
700 | ext4_lblk_t hash = i ? dx_get_hash(entries): 0; | |
ac27a0ec DK |
701 | u32 range = i < count - 1? (dx_get_hash(entries + 1) - hash): ~hash; |
702 | struct stats stats; | |
703 | printk("%s%3u:%03u hash %8x/%8x ",levels?"":" ", i, block, hash, range); | |
1c215028 TT |
704 | bh = ext4_bread(NULL,dir, block, 0); |
705 | if (!bh || IS_ERR(bh)) | |
706 | continue; | |
ac27a0ec DK |
707 | stats = levels? |
708 | dx_show_entries(hinfo, dir, ((struct dx_node *) bh->b_data)->entries, levels - 1): | |
b3098486 MH |
709 | dx_show_leaf(dir, hinfo, (struct ext4_dir_entry_2 *) |
710 | bh->b_data, blocksize, 0); | |
ac27a0ec DK |
711 | names += stats.names; |
712 | space += stats.space; | |
713 | bcount += stats.bcount; | |
af5bc92d | 714 | brelse(bh); |
ac27a0ec DK |
715 | } |
716 | if (bcount) | |
60e6679e | 717 | printk(KERN_DEBUG "%snames %u, fullness %u (%u%%)\n", |
4776004f TT |
718 | levels ? "" : " ", names, space/bcount, |
719 | (space/bcount)*100/blocksize); | |
ac27a0ec DK |
720 | return (struct stats) { names, space, bcount}; |
721 | } | |
722 | #endif /* DX_DEBUG */ | |
723 | ||
724 | /* | |
725 | * Probe for a directory leaf block to search. | |
726 | * | |
727 | * dx_probe can return ERR_BAD_DX_DIR, which means there was a format | |
728 | * error in the directory index, and the caller should fall back to | |
729 | * searching the directory normally. The callers of dx_probe **MUST** | |
730 | * check for this error code, and make sure it never gets reflected | |
731 | * back to userspace. | |
732 | */ | |
733 | static struct dx_frame * | |
5b643f9c | 734 | dx_probe(struct ext4_filename *fname, struct inode *dir, |
dd73b5d5 | 735 | struct dx_hash_info *hinfo, struct dx_frame *frame_in) |
ac27a0ec DK |
736 | { |
737 | unsigned count, indirect; | |
738 | struct dx_entry *at, *entries, *p, *q, *m; | |
739 | struct dx_root *root; | |
ac27a0ec | 740 | struct dx_frame *frame = frame_in; |
dd73b5d5 | 741 | struct dx_frame *ret_err = ERR_PTR(ERR_BAD_DX_DIR); |
ac27a0ec DK |
742 | u32 hash; |
743 | ||
e08ac99f | 744 | memset(frame_in, 0, EXT4_HTREE_LEVEL * sizeof(frame_in[0])); |
dd73b5d5 TT |
745 | frame->bh = ext4_read_dirblock(dir, 0, INDEX); |
746 | if (IS_ERR(frame->bh)) | |
747 | return (struct dx_frame *) frame->bh; | |
748 | ||
749 | root = (struct dx_root *) frame->bh->b_data; | |
ac27a0ec DK |
750 | if (root->info.hash_version != DX_HASH_TEA && |
751 | root->info.hash_version != DX_HASH_HALF_MD4 && | |
752 | root->info.hash_version != DX_HASH_LEGACY) { | |
b03a2f7e AD |
753 | ext4_warning_inode(dir, "Unrecognised inode hash code %u", |
754 | root->info.hash_version); | |
ac27a0ec DK |
755 | goto fail; |
756 | } | |
5b643f9c TT |
757 | if (fname) |
758 | hinfo = &fname->hinfo; | |
ac27a0ec | 759 | hinfo->hash_version = root->info.hash_version; |
f99b2589 TT |
760 | if (hinfo->hash_version <= DX_HASH_TEA) |
761 | hinfo->hash_version += EXT4_SB(dir->i_sb)->s_hash_unsigned; | |
617ba13b | 762 | hinfo->seed = EXT4_SB(dir->i_sb)->s_hash_seed; |
5b643f9c TT |
763 | if (fname && fname_name(fname)) |
764 | ext4fs_dirhash(fname_name(fname), fname_len(fname), hinfo); | |
ac27a0ec DK |
765 | hash = hinfo->hash; |
766 | ||
767 | if (root->info.unused_flags & 1) { | |
b03a2f7e AD |
768 | ext4_warning_inode(dir, "Unimplemented hash flags: %#06x", |
769 | root->info.unused_flags); | |
ac27a0ec DK |
770 | goto fail; |
771 | } | |
772 | ||
b03a2f7e | 773 | indirect = root->info.indirect_levels; |
e08ac99f AB |
774 | if (indirect >= ext4_dir_htree_level(dir->i_sb)) { |
775 | ext4_warning(dir->i_sb, | |
776 | "Directory (ino: %lu) htree depth %#06x exceed" | |
777 | "supported value", dir->i_ino, | |
778 | ext4_dir_htree_level(dir->i_sb)); | |
779 | if (ext4_dir_htree_level(dir->i_sb) < EXT4_HTREE_LEVEL) { | |
780 | ext4_warning(dir->i_sb, "Enable large directory " | |
781 | "feature to access it"); | |
782 | } | |
ac27a0ec DK |
783 | goto fail; |
784 | } | |
785 | ||
b03a2f7e AD |
786 | entries = (struct dx_entry *)(((char *)&root->info) + |
787 | root->info.info_length); | |
3d82abae ES |
788 | |
789 | if (dx_get_limit(entries) != dx_root_limit(dir, | |
790 | root->info.info_length)) { | |
b03a2f7e AD |
791 | ext4_warning_inode(dir, "dx entry: limit %u != root limit %u", |
792 | dx_get_limit(entries), | |
793 | dx_root_limit(dir, root->info.info_length)); | |
3d82abae ES |
794 | goto fail; |
795 | } | |
796 | ||
af5bc92d | 797 | dxtrace(printk("Look up %x", hash)); |
dd73b5d5 | 798 | while (1) { |
ac27a0ec | 799 | count = dx_get_count(entries); |
3d82abae | 800 | if (!count || count > dx_get_limit(entries)) { |
b03a2f7e AD |
801 | ext4_warning_inode(dir, |
802 | "dx entry: count %u beyond limit %u", | |
803 | count, dx_get_limit(entries)); | |
dd73b5d5 | 804 | goto fail; |
3d82abae ES |
805 | } |
806 | ||
ac27a0ec DK |
807 | p = entries + 1; |
808 | q = entries + count - 1; | |
dd73b5d5 | 809 | while (p <= q) { |
b03a2f7e | 810 | m = p + (q - p) / 2; |
d74f3d25 | 811 | dxtrace(printk(KERN_CONT ".")); |
ac27a0ec DK |
812 | if (dx_get_hash(m) > hash) |
813 | q = m - 1; | |
814 | else | |
815 | p = m + 1; | |
816 | } | |
817 | ||
dd73b5d5 | 818 | if (0) { // linear search cross check |
ac27a0ec DK |
819 | unsigned n = count - 1; |
820 | at = entries; | |
821 | while (n--) | |
822 | { | |
d74f3d25 | 823 | dxtrace(printk(KERN_CONT ",")); |
ac27a0ec DK |
824 | if (dx_get_hash(++at) > hash) |
825 | { | |
826 | at--; | |
827 | break; | |
828 | } | |
829 | } | |
830 | assert (at == p - 1); | |
831 | } | |
832 | ||
833 | at = p - 1; | |
d74f3d25 JP |
834 | dxtrace(printk(KERN_CONT " %x->%u\n", |
835 | at == entries ? 0 : dx_get_hash(at), | |
b03a2f7e | 836 | dx_get_block(at))); |
ac27a0ec DK |
837 | frame->entries = entries; |
838 | frame->at = at; | |
dd73b5d5 TT |
839 | if (!indirect--) |
840 | return frame; | |
841 | frame++; | |
842 | frame->bh = ext4_read_dirblock(dir, dx_get_block(at), INDEX); | |
843 | if (IS_ERR(frame->bh)) { | |
844 | ret_err = (struct dx_frame *) frame->bh; | |
845 | frame->bh = NULL; | |
846 | goto fail; | |
dbe89444 | 847 | } |
dd73b5d5 | 848 | entries = ((struct dx_node *) frame->bh->b_data)->entries; |
dbe89444 | 849 | |
b03a2f7e AD |
850 | if (dx_get_limit(entries) != dx_node_limit(dir)) { |
851 | ext4_warning_inode(dir, | |
852 | "dx entry: limit %u != node limit %u", | |
853 | dx_get_limit(entries), dx_node_limit(dir)); | |
dd73b5d5 | 854 | goto fail; |
3d82abae | 855 | } |
ac27a0ec | 856 | } |
dd73b5d5 | 857 | fail: |
ac27a0ec DK |
858 | while (frame >= frame_in) { |
859 | brelse(frame->bh); | |
860 | frame--; | |
861 | } | |
b3098486 | 862 | |
dd73b5d5 | 863 | if (ret_err == ERR_PTR(ERR_BAD_DX_DIR)) |
b03a2f7e AD |
864 | ext4_warning_inode(dir, |
865 | "Corrupt directory, running e2fsck is recommended"); | |
dd73b5d5 | 866 | return ret_err; |
ac27a0ec DK |
867 | } |
868 | ||
b03a2f7e | 869 | static void dx_release(struct dx_frame *frames) |
ac27a0ec | 870 | { |
e08ac99f AB |
871 | struct dx_root_info *info; |
872 | int i; | |
873 | ||
ac27a0ec DK |
874 | if (frames[0].bh == NULL) |
875 | return; | |
876 | ||
e08ac99f AB |
877 | info = &((struct dx_root *)frames[0].bh->b_data)->info; |
878 | for (i = 0; i <= info->indirect_levels; i++) { | |
879 | if (frames[i].bh == NULL) | |
880 | break; | |
881 | brelse(frames[i].bh); | |
882 | frames[i].bh = NULL; | |
883 | } | |
ac27a0ec DK |
884 | } |
885 | ||
886 | /* | |
887 | * This function increments the frame pointer to search the next leaf | |
888 | * block, and reads in the necessary intervening nodes if the search | |
889 | * should be necessary. Whether or not the search is necessary is | |
890 | * controlled by the hash parameter. If the hash value is even, then | |
891 | * the search is only continued if the next block starts with that | |
892 | * hash value. This is used if we are searching for a specific file. | |
893 | * | |
894 | * If the hash value is HASH_NB_ALWAYS, then always go to the next block. | |
895 | * | |
896 | * This function returns 1 if the caller should continue to search, | |
897 | * or 0 if it should not. If there is an error reading one of the | |
898 | * index blocks, it will a negative error code. | |
899 | * | |
900 | * If start_hash is non-null, it will be filled in with the starting | |
901 | * hash of the next page. | |
902 | */ | |
617ba13b | 903 | static int ext4_htree_next_block(struct inode *dir, __u32 hash, |
ac27a0ec DK |
904 | struct dx_frame *frame, |
905 | struct dx_frame *frames, | |
906 | __u32 *start_hash) | |
907 | { | |
908 | struct dx_frame *p; | |
909 | struct buffer_head *bh; | |
dc6982ff | 910 | int num_frames = 0; |
ac27a0ec DK |
911 | __u32 bhash; |
912 | ||
913 | p = frame; | |
914 | /* | |
915 | * Find the next leaf page by incrementing the frame pointer. | |
916 | * If we run out of entries in the interior node, loop around and | |
917 | * increment pointer in the parent node. When we break out of | |
918 | * this loop, num_frames indicates the number of interior | |
919 | * nodes need to be read. | |
920 | */ | |
921 | while (1) { | |
922 | if (++(p->at) < p->entries + dx_get_count(p->entries)) | |
923 | break; | |
924 | if (p == frames) | |
925 | return 0; | |
926 | num_frames++; | |
927 | p--; | |
928 | } | |
929 | ||
930 | /* | |
931 | * If the hash is 1, then continue only if the next page has a | |
932 | * continuation hash of any value. This is used for readdir | |
933 | * handling. Otherwise, check to see if the hash matches the | |
934 | * desired contiuation hash. If it doesn't, return since | |
935 | * there's no point to read in the successive index pages. | |
936 | */ | |
937 | bhash = dx_get_hash(p->at); | |
938 | if (start_hash) | |
939 | *start_hash = bhash; | |
940 | if ((hash & 1) == 0) { | |
941 | if ((bhash & ~1) != hash) | |
942 | return 0; | |
943 | } | |
944 | /* | |
945 | * If the hash is HASH_NB_ALWAYS, we always go to the next | |
946 | * block so no check is necessary | |
947 | */ | |
948 | while (num_frames--) { | |
dc6982ff TT |
949 | bh = ext4_read_dirblock(dir, dx_get_block(p->at), INDEX); |
950 | if (IS_ERR(bh)) | |
951 | return PTR_ERR(bh); | |
ac27a0ec | 952 | p++; |
af5bc92d | 953 | brelse(p->bh); |
ac27a0ec DK |
954 | p->bh = bh; |
955 | p->at = p->entries = ((struct dx_node *) bh->b_data)->entries; | |
956 | } | |
957 | return 1; | |
958 | } | |
959 | ||
960 | ||
ac27a0ec DK |
961 | /* |
962 | * This function fills a red-black tree with information from a | |
963 | * directory block. It returns the number directory entries loaded | |
964 | * into the tree. If there is an error it is returned in err. | |
965 | */ | |
966 | static int htree_dirblock_to_tree(struct file *dir_file, | |
725d26d3 | 967 | struct inode *dir, ext4_lblk_t block, |
ac27a0ec DK |
968 | struct dx_hash_info *hinfo, |
969 | __u32 start_hash, __u32 start_minor_hash) | |
970 | { | |
971 | struct buffer_head *bh; | |
617ba13b | 972 | struct ext4_dir_entry_2 *de, *top; |
90b0a973 | 973 | int err = 0, count = 0; |
a7550b30 | 974 | struct fscrypt_str fname_crypto_str = FSTR_INIT(NULL, 0), tmp_str; |
ac27a0ec | 975 | |
725d26d3 AK |
976 | dxtrace(printk(KERN_INFO "In htree dirblock_to_tree: block %lu\n", |
977 | (unsigned long)block)); | |
dc6982ff TT |
978 | bh = ext4_read_dirblock(dir, block, DIRENT); |
979 | if (IS_ERR(bh)) | |
980 | return PTR_ERR(bh); | |
b0336e8d | 981 | |
617ba13b MC |
982 | de = (struct ext4_dir_entry_2 *) bh->b_data; |
983 | top = (struct ext4_dir_entry_2 *) ((char *) de + | |
ac27a0ec | 984 | dir->i_sb->s_blocksize - |
617ba13b | 985 | EXT4_DIR_REC_LEN(0)); |
1f3862b5 MH |
986 | #ifdef CONFIG_EXT4_FS_ENCRYPTION |
987 | /* Check if the directory is encrypted */ | |
b7236e21 | 988 | if (ext4_encrypted_inode(dir)) { |
a7550b30 | 989 | err = fscrypt_get_encryption_info(dir); |
c936e1ec TT |
990 | if (err < 0) { |
991 | brelse(bh); | |
992 | return err; | |
993 | } | |
a7550b30 | 994 | err = fscrypt_fname_alloc_buffer(dir, EXT4_NAME_LEN, |
1f3862b5 MH |
995 | &fname_crypto_str); |
996 | if (err < 0) { | |
1f3862b5 MH |
997 | brelse(bh); |
998 | return err; | |
999 | } | |
1000 | } | |
1001 | #endif | |
3d0518f4 | 1002 | for (; de < top; de = ext4_next_entry(de, dir->i_sb->s_blocksize)) { |
f7c21177 | 1003 | if (ext4_check_dir_entry(dir, NULL, de, bh, |
226ba972 | 1004 | bh->b_data, bh->b_size, |
cad3f007 TT |
1005 | (block<<EXT4_BLOCK_SIZE_BITS(dir->i_sb)) |
1006 | + ((char *)de - bh->b_data))) { | |
64cb9273 AV |
1007 | /* silently ignore the rest of the block */ |
1008 | break; | |
e6c40211 | 1009 | } |
617ba13b | 1010 | ext4fs_dirhash(de->name, de->name_len, hinfo); |
ac27a0ec DK |
1011 | if ((hinfo->hash < start_hash) || |
1012 | ((hinfo->hash == start_hash) && | |
1013 | (hinfo->minor_hash < start_minor_hash))) | |
1014 | continue; | |
1015 | if (de->inode == 0) | |
1016 | continue; | |
b7236e21 | 1017 | if (!ext4_encrypted_inode(dir)) { |
1f3862b5 MH |
1018 | tmp_str.name = de->name; |
1019 | tmp_str.len = de->name_len; | |
1020 | err = ext4_htree_store_dirent(dir_file, | |
1021 | hinfo->hash, hinfo->minor_hash, de, | |
1022 | &tmp_str); | |
1023 | } else { | |
d2299590 | 1024 | int save_len = fname_crypto_str.len; |
a7550b30 JK |
1025 | struct fscrypt_str de_name = FSTR_INIT(de->name, |
1026 | de->name_len); | |
d2299590 | 1027 | |
1f3862b5 | 1028 | /* Directory is encrypted */ |
a7550b30 JK |
1029 | err = fscrypt_fname_disk_to_usr(dir, hinfo->hash, |
1030 | hinfo->minor_hash, &de_name, | |
1031 | &fname_crypto_str); | |
ef1eb3aa | 1032 | if (err) { |
1f3862b5 MH |
1033 | count = err; |
1034 | goto errout; | |
1035 | } | |
1036 | err = ext4_htree_store_dirent(dir_file, | |
1037 | hinfo->hash, hinfo->minor_hash, de, | |
1038 | &fname_crypto_str); | |
d2299590 | 1039 | fname_crypto_str.len = save_len; |
1f3862b5 | 1040 | } |
2f61830a | 1041 | if (err != 0) { |
1f3862b5 MH |
1042 | count = err; |
1043 | goto errout; | |
ac27a0ec DK |
1044 | } |
1045 | count++; | |
1046 | } | |
1f3862b5 | 1047 | errout: |
ac27a0ec | 1048 | brelse(bh); |
1f3862b5 | 1049 | #ifdef CONFIG_EXT4_FS_ENCRYPTION |
a7550b30 | 1050 | fscrypt_fname_free_buffer(&fname_crypto_str); |
1f3862b5 | 1051 | #endif |
ac27a0ec DK |
1052 | return count; |
1053 | } | |
1054 | ||
1055 | ||
1056 | /* | |
1057 | * This function fills a red-black tree with information from a | |
1058 | * directory. We start scanning the directory in hash order, starting | |
1059 | * at start_hash and start_minor_hash. | |
1060 | * | |
1061 | * This function returns the number of entries inserted into the tree, | |
1062 | * or a negative error code. | |
1063 | */ | |
617ba13b | 1064 | int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, |
ac27a0ec DK |
1065 | __u32 start_minor_hash, __u32 *next_hash) |
1066 | { | |
1067 | struct dx_hash_info hinfo; | |
617ba13b | 1068 | struct ext4_dir_entry_2 *de; |
e08ac99f | 1069 | struct dx_frame frames[EXT4_HTREE_LEVEL], *frame; |
ac27a0ec | 1070 | struct inode *dir; |
725d26d3 | 1071 | ext4_lblk_t block; |
ac27a0ec | 1072 | int count = 0; |
725d26d3 | 1073 | int ret, err; |
ac27a0ec | 1074 | __u32 hashval; |
a7550b30 | 1075 | struct fscrypt_str tmp_str; |
ac27a0ec | 1076 | |
60e6679e | 1077 | dxtrace(printk(KERN_DEBUG "In htree_fill_tree, start hash: %x:%x\n", |
4776004f | 1078 | start_hash, start_minor_hash)); |
496ad9aa | 1079 | dir = file_inode(dir_file); |
12e9b892 | 1080 | if (!(ext4_test_inode_flag(dir, EXT4_INODE_INDEX))) { |
617ba13b | 1081 | hinfo.hash_version = EXT4_SB(dir->i_sb)->s_def_hash_version; |
f99b2589 TT |
1082 | if (hinfo.hash_version <= DX_HASH_TEA) |
1083 | hinfo.hash_version += | |
1084 | EXT4_SB(dir->i_sb)->s_hash_unsigned; | |
617ba13b | 1085 | hinfo.seed = EXT4_SB(dir->i_sb)->s_hash_seed; |
8af0f082 TM |
1086 | if (ext4_has_inline_data(dir)) { |
1087 | int has_inline_data = 1; | |
1088 | count = htree_inlinedir_to_tree(dir_file, dir, 0, | |
1089 | &hinfo, start_hash, | |
1090 | start_minor_hash, | |
1091 | &has_inline_data); | |
1092 | if (has_inline_data) { | |
1093 | *next_hash = ~0; | |
1094 | return count; | |
1095 | } | |
1096 | } | |
ac27a0ec DK |
1097 | count = htree_dirblock_to_tree(dir_file, dir, 0, &hinfo, |
1098 | start_hash, start_minor_hash); | |
1099 | *next_hash = ~0; | |
1100 | return count; | |
1101 | } | |
1102 | hinfo.hash = start_hash; | |
1103 | hinfo.minor_hash = 0; | |
dd73b5d5 TT |
1104 | frame = dx_probe(NULL, dir, &hinfo, frames); |
1105 | if (IS_ERR(frame)) | |
1106 | return PTR_ERR(frame); | |
ac27a0ec DK |
1107 | |
1108 | /* Add '.' and '..' from the htree header */ | |
1109 | if (!start_hash && !start_minor_hash) { | |
617ba13b | 1110 | de = (struct ext4_dir_entry_2 *) frames[0].bh->b_data; |
2f61830a TT |
1111 | tmp_str.name = de->name; |
1112 | tmp_str.len = de->name_len; | |
1113 | err = ext4_htree_store_dirent(dir_file, 0, 0, | |
1114 | de, &tmp_str); | |
1115 | if (err != 0) | |
ac27a0ec DK |
1116 | goto errout; |
1117 | count++; | |
1118 | } | |
1119 | if (start_hash < 2 || (start_hash ==2 && start_minor_hash==0)) { | |
617ba13b | 1120 | de = (struct ext4_dir_entry_2 *) frames[0].bh->b_data; |
3d0518f4 | 1121 | de = ext4_next_entry(de, dir->i_sb->s_blocksize); |
2f61830a TT |
1122 | tmp_str.name = de->name; |
1123 | tmp_str.len = de->name_len; | |
1124 | err = ext4_htree_store_dirent(dir_file, 2, 0, | |
1125 | de, &tmp_str); | |
1126 | if (err != 0) | |
ac27a0ec DK |
1127 | goto errout; |
1128 | count++; | |
1129 | } | |
1130 | ||
1131 | while (1) { | |
1f60fbe7 TT |
1132 | if (fatal_signal_pending(current)) { |
1133 | err = -ERESTARTSYS; | |
1134 | goto errout; | |
1135 | } | |
1136 | cond_resched(); | |
ac27a0ec DK |
1137 | block = dx_get_block(frame->at); |
1138 | ret = htree_dirblock_to_tree(dir_file, dir, block, &hinfo, | |
1139 | start_hash, start_minor_hash); | |
1140 | if (ret < 0) { | |
1141 | err = ret; | |
1142 | goto errout; | |
1143 | } | |
1144 | count += ret; | |
1145 | hashval = ~0; | |
617ba13b | 1146 | ret = ext4_htree_next_block(dir, HASH_NB_ALWAYS, |
ac27a0ec DK |
1147 | frame, frames, &hashval); |
1148 | *next_hash = hashval; | |
1149 | if (ret < 0) { | |
1150 | err = ret; | |
1151 | goto errout; | |
1152 | } | |
1153 | /* | |
1154 | * Stop if: (a) there are no more entries, or | |
1155 | * (b) we have inserted at least one entry and the | |
1156 | * next hash value is not a continuation | |
1157 | */ | |
1158 | if ((ret == 0) || | |
1159 | (count && ((hashval & 1) == 0))) | |
1160 | break; | |
1161 | } | |
1162 | dx_release(frames); | |
4776004f TT |
1163 | dxtrace(printk(KERN_DEBUG "Fill tree: returned %d entries, " |
1164 | "next hash: %x\n", count, *next_hash)); | |
ac27a0ec DK |
1165 | return count; |
1166 | errout: | |
1167 | dx_release(frames); | |
1168 | return (err); | |
1169 | } | |
1170 | ||
7335cd3b TM |
1171 | static inline int search_dirblock(struct buffer_head *bh, |
1172 | struct inode *dir, | |
5b643f9c | 1173 | struct ext4_filename *fname, |
7335cd3b TM |
1174 | unsigned int offset, |
1175 | struct ext4_dir_entry_2 **res_dir) | |
1176 | { | |
5b643f9c | 1177 | return ext4_search_dir(bh, bh->b_data, dir->i_sb->s_blocksize, dir, |
d6b97550 | 1178 | fname, offset, res_dir); |
7335cd3b TM |
1179 | } |
1180 | ||
ac27a0ec DK |
1181 | /* |
1182 | * Directory block splitting, compacting | |
1183 | */ | |
1184 | ||
ef2b02d3 ES |
1185 | /* |
1186 | * Create map of hash values, offsets, and sizes, stored at end of block. | |
1187 | * Returns number of entries mapped. | |
1188 | */ | |
1f3862b5 MH |
1189 | static int dx_make_map(struct inode *dir, struct ext4_dir_entry_2 *de, |
1190 | unsigned blocksize, struct dx_hash_info *hinfo, | |
8bad4597 | 1191 | struct dx_map_entry *map_tail) |
ac27a0ec DK |
1192 | { |
1193 | int count = 0; | |
1194 | char *base = (char *) de; | |
1195 | struct dx_hash_info h = *hinfo; | |
1196 | ||
8bad4597 | 1197 | while ((char *) de < base + blocksize) { |
ac27a0ec | 1198 | if (de->name_len && de->inode) { |
617ba13b | 1199 | ext4fs_dirhash(de->name, de->name_len, &h); |
ac27a0ec DK |
1200 | map_tail--; |
1201 | map_tail->hash = h.hash; | |
9aee2286 | 1202 | map_tail->offs = ((char *) de - base)>>2; |
ef2b02d3 | 1203 | map_tail->size = le16_to_cpu(de->rec_len); |
ac27a0ec DK |
1204 | count++; |
1205 | cond_resched(); | |
1206 | } | |
1207 | /* XXX: do we need to check rec_len == 0 case? -Chris */ | |
3d0518f4 | 1208 | de = ext4_next_entry(de, blocksize); |
ac27a0ec DK |
1209 | } |
1210 | return count; | |
1211 | } | |
1212 | ||
ef2b02d3 | 1213 | /* Sort map by hash value */ |
ac27a0ec DK |
1214 | static void dx_sort_map (struct dx_map_entry *map, unsigned count) |
1215 | { | |
63f57933 AM |
1216 | struct dx_map_entry *p, *q, *top = map + count - 1; |
1217 | int more; | |
1218 | /* Combsort until bubble sort doesn't suck */ | |
1219 | while (count > 2) { | |
1220 | count = count*10/13; | |
1221 | if (count - 9 < 2) /* 9, 10 -> 11 */ | |
1222 | count = 11; | |
1223 | for (p = top, q = p - count; q >= map; p--, q--) | |
1224 | if (p->hash < q->hash) | |
1225 | swap(*p, *q); | |
1226 | } | |
1227 | /* Garden variety bubble sort */ | |
1228 | do { | |
1229 | more = 0; | |
1230 | q = top; | |
1231 | while (q-- > map) { | |
1232 | if (q[1].hash >= q[0].hash) | |
ac27a0ec | 1233 | continue; |
63f57933 AM |
1234 | swap(*(q+1), *q); |
1235 | more = 1; | |
ac27a0ec DK |
1236 | } |
1237 | } while(more); | |
1238 | } | |
1239 | ||
725d26d3 | 1240 | static void dx_insert_block(struct dx_frame *frame, u32 hash, ext4_lblk_t block) |
ac27a0ec DK |
1241 | { |
1242 | struct dx_entry *entries = frame->entries; | |
1243 | struct dx_entry *old = frame->at, *new = old + 1; | |
1244 | int count = dx_get_count(entries); | |
1245 | ||
1246 | assert(count < dx_get_limit(entries)); | |
1247 | assert(old < entries + count); | |
1248 | memmove(new + 1, new, (char *)(entries + count) - (char *)(new)); | |
1249 | dx_set_hash(new, hash); | |
1250 | dx_set_block(new, block); | |
1251 | dx_set_count(entries, count + 1); | |
1252 | } | |
ac27a0ec | 1253 | |
ac27a0ec | 1254 | /* |
d9b9f8d5 | 1255 | * Test whether a directory entry matches the filename being searched for. |
ac27a0ec | 1256 | * |
d9b9f8d5 | 1257 | * Return: %true if the directory entry matches, otherwise %false. |
ac27a0ec | 1258 | */ |
d9b9f8d5 EB |
1259 | static inline bool ext4_match(const struct ext4_filename *fname, |
1260 | const struct ext4_dir_entry_2 *de) | |
ac27a0ec | 1261 | { |
067d1023 | 1262 | struct fscrypt_name f; |
1f3862b5 | 1263 | |
ac27a0ec | 1264 | if (!de->inode) |
d9b9f8d5 | 1265 | return false; |
1f3862b5 | 1266 | |
067d1023 EB |
1267 | f.usr_fname = fname->usr_fname; |
1268 | f.disk_name = fname->disk_name; | |
1f3862b5 | 1269 | #ifdef CONFIG_EXT4_FS_ENCRYPTION |
067d1023 | 1270 | f.crypto_buf = fname->crypto_buf; |
1f3862b5 | 1271 | #endif |
067d1023 | 1272 | return fscrypt_match_name(&f, de->name, de->name_len); |
ac27a0ec DK |
1273 | } |
1274 | ||
1275 | /* | |
1276 | * Returns 0 if not found, -1 on failure, and 1 on success | |
1277 | */ | |
5b643f9c TT |
1278 | int ext4_search_dir(struct buffer_head *bh, char *search_buf, int buf_size, |
1279 | struct inode *dir, struct ext4_filename *fname, | |
5b643f9c | 1280 | unsigned int offset, struct ext4_dir_entry_2 **res_dir) |
ac27a0ec | 1281 | { |
617ba13b | 1282 | struct ext4_dir_entry_2 * de; |
ac27a0ec DK |
1283 | char * dlimit; |
1284 | int de_len; | |
1f3862b5 | 1285 | |
7335cd3b TM |
1286 | de = (struct ext4_dir_entry_2 *)search_buf; |
1287 | dlimit = search_buf + buf_size; | |
ac27a0ec DK |
1288 | while ((char *) de < dlimit) { |
1289 | /* this code is executed quadratically often */ | |
1290 | /* do minimal checking `by hand' */ | |
d9b9f8d5 EB |
1291 | if ((char *) de + de->name_len <= dlimit && |
1292 | ext4_match(fname, de)) { | |
1293 | /* found a match - just to be sure, do | |
1294 | * a full check */ | |
1295 | if (ext4_check_dir_entry(dir, NULL, de, bh, bh->b_data, | |
1296 | bh->b_size, offset)) | |
1297 | return -1; | |
1298 | *res_dir = de; | |
1299 | return 1; | |
ac27a0ec DK |
1300 | } |
1301 | /* prevent looping on a bad block */ | |
3d0518f4 WY |
1302 | de_len = ext4_rec_len_from_disk(de->rec_len, |
1303 | dir->i_sb->s_blocksize); | |
d9b9f8d5 EB |
1304 | if (de_len <= 0) |
1305 | return -1; | |
ac27a0ec | 1306 | offset += de_len; |
617ba13b | 1307 | de = (struct ext4_dir_entry_2 *) ((char *) de + de_len); |
ac27a0ec | 1308 | } |
d9b9f8d5 | 1309 | return 0; |
ac27a0ec DK |
1310 | } |
1311 | ||
c6af8803 DW |
1312 | static int is_dx_internal_node(struct inode *dir, ext4_lblk_t block, |
1313 | struct ext4_dir_entry *de) | |
1314 | { | |
1315 | struct super_block *sb = dir->i_sb; | |
1316 | ||
1317 | if (!is_dx(dir)) | |
1318 | return 0; | |
1319 | if (block == 0) | |
1320 | return 1; | |
1321 | if (de->inode == 0 && | |
1322 | ext4_rec_len_from_disk(de->rec_len, sb->s_blocksize) == | |
1323 | sb->s_blocksize) | |
1324 | return 1; | |
1325 | return 0; | |
1326 | } | |
ac27a0ec DK |
1327 | |
1328 | /* | |
617ba13b | 1329 | * ext4_find_entry() |
ac27a0ec DK |
1330 | * |
1331 | * finds an entry in the specified directory with the wanted name. It | |
1332 | * returns the cache buffer in which the entry was found, and the entry | |
1333 | * itself (as a parameter - res_dir). It does NOT read the inode of the | |
1334 | * entry - you'll have to do that yourself if you want to. | |
1335 | * | |
1336 | * The returned buffer_head has ->b_count elevated. The caller is expected | |
1337 | * to brelse() it when appropriate. | |
1338 | */ | |
f702ba0f TT |
1339 | static struct buffer_head * ext4_find_entry (struct inode *dir, |
1340 | const struct qstr *d_name, | |
32f7f22c TM |
1341 | struct ext4_dir_entry_2 **res_dir, |
1342 | int *inlined) | |
ac27a0ec | 1343 | { |
af5bc92d TT |
1344 | struct super_block *sb; |
1345 | struct buffer_head *bh_use[NAMEI_RA_SIZE]; | |
1346 | struct buffer_head *bh, *ret = NULL; | |
9699d4f9 | 1347 | ext4_lblk_t start, block; |
8941ec8b | 1348 | const u8 *name = d_name->name; |
9699d4f9 | 1349 | size_t ra_max = 0; /* Number of bh's in the readahead |
ac27a0ec | 1350 | buffer, bh_use[] */ |
9699d4f9 | 1351 | size_t ra_ptr = 0; /* Current index into readahead |
ac27a0ec | 1352 | buffer */ |
725d26d3 | 1353 | ext4_lblk_t nblocks; |
5b643f9c TT |
1354 | int i, namelen, retval; |
1355 | struct ext4_filename fname; | |
ac27a0ec DK |
1356 | |
1357 | *res_dir = NULL; | |
1358 | sb = dir->i_sb; | |
f702ba0f | 1359 | namelen = d_name->len; |
617ba13b | 1360 | if (namelen > EXT4_NAME_LEN) |
ac27a0ec | 1361 | return NULL; |
e8e948e7 | 1362 | |
5b643f9c | 1363 | retval = ext4_fname_setup_filename(dir, d_name, 1, &fname); |
54475f53 EB |
1364 | if (retval == -ENOENT) |
1365 | return NULL; | |
5b643f9c TT |
1366 | if (retval) |
1367 | return ERR_PTR(retval); | |
1368 | ||
e8e948e7 TM |
1369 | if (ext4_has_inline_data(dir)) { |
1370 | int has_inline_data = 1; | |
d6b97550 | 1371 | ret = ext4_find_inline_entry(dir, &fname, res_dir, |
e8e948e7 | 1372 | &has_inline_data); |
32f7f22c TM |
1373 | if (has_inline_data) { |
1374 | if (inlined) | |
1375 | *inlined = 1; | |
5b643f9c | 1376 | goto cleanup_and_exit; |
32f7f22c | 1377 | } |
e8e948e7 TM |
1378 | } |
1379 | ||
8941ec8b | 1380 | if ((namelen <= 2) && (name[0] == '.') && |
6d5c3aa8 | 1381 | (name[1] == '.' || name[1] == '\0')) { |
8941ec8b TT |
1382 | /* |
1383 | * "." or ".." will only be in the first block | |
1384 | * NFS may look up ".."; "." should be handled by the VFS | |
1385 | */ | |
1386 | block = start = 0; | |
1387 | nblocks = 1; | |
1388 | goto restart; | |
1389 | } | |
ac27a0ec | 1390 | if (is_dx(dir)) { |
5b643f9c | 1391 | ret = ext4_dx_find_entry(dir, &fname, res_dir); |
ac27a0ec DK |
1392 | /* |
1393 | * On success, or if the error was file not found, | |
1394 | * return. Otherwise, fall back to doing a search the | |
1395 | * old fashioned way. | |
1396 | */ | |
5b643f9c TT |
1397 | if (!IS_ERR(ret) || PTR_ERR(ret) != ERR_BAD_DX_DIR) |
1398 | goto cleanup_and_exit; | |
4776004f TT |
1399 | dxtrace(printk(KERN_DEBUG "ext4_find_entry: dx failed, " |
1400 | "falling back\n")); | |
ac27a0ec | 1401 | } |
617ba13b | 1402 | nblocks = dir->i_size >> EXT4_BLOCK_SIZE_BITS(sb); |
9d5afec6 CR |
1403 | if (!nblocks) { |
1404 | ret = NULL; | |
1405 | goto cleanup_and_exit; | |
1406 | } | |
617ba13b | 1407 | start = EXT4_I(dir)->i_dir_start_lookup; |
ac27a0ec DK |
1408 | if (start >= nblocks) |
1409 | start = 0; | |
1410 | block = start; | |
1411 | restart: | |
1412 | do { | |
1413 | /* | |
1414 | * We deal with the read-ahead logic here. | |
1415 | */ | |
1416 | if (ra_ptr >= ra_max) { | |
1417 | /* Refill the readahead buffer */ | |
1418 | ra_ptr = 0; | |
9699d4f9 TE |
1419 | if (block < start) |
1420 | ra_max = start - block; | |
1421 | else | |
1422 | ra_max = nblocks - block; | |
1423 | ra_max = min(ra_max, ARRAY_SIZE(bh_use)); | |
1424 | retval = ext4_bread_batch(dir, block, ra_max, | |
1425 | false /* wait */, bh_use); | |
1426 | if (retval) { | |
1427 | ret = ERR_PTR(retval); | |
1428 | ra_max = 0; | |
1429 | goto cleanup_and_exit; | |
ac27a0ec DK |
1430 | } |
1431 | } | |
1432 | if ((bh = bh_use[ra_ptr++]) == NULL) | |
1433 | goto next; | |
1434 | wait_on_buffer(bh); | |
1435 | if (!buffer_uptodate(bh)) { | |
24676da4 TT |
1436 | EXT4_ERROR_INODE(dir, "reading directory lblock %lu", |
1437 | (unsigned long) block); | |
ac27a0ec | 1438 | brelse(bh); |
6febe6f2 KK |
1439 | ret = ERR_PTR(-EIO); |
1440 | goto cleanup_and_exit; | |
ac27a0ec | 1441 | } |
b0336e8d | 1442 | if (!buffer_verified(bh) && |
c6af8803 DW |
1443 | !is_dx_internal_node(dir, block, |
1444 | (struct ext4_dir_entry *)bh->b_data) && | |
b0336e8d DW |
1445 | !ext4_dirent_csum_verify(dir, |
1446 | (struct ext4_dir_entry *)bh->b_data)) { | |
1447 | EXT4_ERROR_INODE(dir, "checksumming directory " | |
1448 | "block %lu", (unsigned long)block); | |
1449 | brelse(bh); | |
bdddf342 TT |
1450 | ret = ERR_PTR(-EFSBADCRC); |
1451 | goto cleanup_and_exit; | |
b0336e8d DW |
1452 | } |
1453 | set_buffer_verified(bh); | |
d6b97550 | 1454 | i = search_dirblock(bh, dir, &fname, |
617ba13b | 1455 | block << EXT4_BLOCK_SIZE_BITS(sb), res_dir); |
ac27a0ec | 1456 | if (i == 1) { |
617ba13b | 1457 | EXT4_I(dir)->i_dir_start_lookup = block; |
ac27a0ec DK |
1458 | ret = bh; |
1459 | goto cleanup_and_exit; | |
1460 | } else { | |
1461 | brelse(bh); | |
1462 | if (i < 0) | |
1463 | goto cleanup_and_exit; | |
1464 | } | |
1465 | next: | |
1466 | if (++block >= nblocks) | |
1467 | block = 0; | |
1468 | } while (block != start); | |
1469 | ||
1470 | /* | |
1471 | * If the directory has grown while we were searching, then | |
1472 | * search the last part of the directory before giving up. | |
1473 | */ | |
1474 | block = nblocks; | |
617ba13b | 1475 | nblocks = dir->i_size >> EXT4_BLOCK_SIZE_BITS(sb); |
ac27a0ec DK |
1476 | if (block < nblocks) { |
1477 | start = 0; | |
1478 | goto restart; | |
1479 | } | |
1480 | ||
1481 | cleanup_and_exit: | |
1482 | /* Clean up the read-ahead blocks */ | |
1483 | for (; ra_ptr < ra_max; ra_ptr++) | |
af5bc92d | 1484 | brelse(bh_use[ra_ptr]); |
5b643f9c | 1485 | ext4_fname_free_filename(&fname); |
ac27a0ec DK |
1486 | return ret; |
1487 | } | |
1488 | ||
5b643f9c TT |
1489 | static struct buffer_head * ext4_dx_find_entry(struct inode *dir, |
1490 | struct ext4_filename *fname, | |
1491 | struct ext4_dir_entry_2 **res_dir) | |
ac27a0ec | 1492 | { |
8941ec8b | 1493 | struct super_block * sb = dir->i_sb; |
e08ac99f | 1494 | struct dx_frame frames[EXT4_HTREE_LEVEL], *frame; |
ac27a0ec | 1495 | struct buffer_head *bh; |
725d26d3 | 1496 | ext4_lblk_t block; |
ac27a0ec | 1497 | int retval; |
ac27a0ec | 1498 | |
1f3862b5 MH |
1499 | #ifdef CONFIG_EXT4_FS_ENCRYPTION |
1500 | *res_dir = NULL; | |
1501 | #endif | |
5b643f9c | 1502 | frame = dx_probe(fname, dir, NULL, frames); |
dd73b5d5 TT |
1503 | if (IS_ERR(frame)) |
1504 | return (struct buffer_head *) frame; | |
ac27a0ec DK |
1505 | do { |
1506 | block = dx_get_block(frame->at); | |
dc6982ff | 1507 | bh = ext4_read_dirblock(dir, block, DIRENT); |
537d8f93 | 1508 | if (IS_ERR(bh)) |
b0336e8d | 1509 | goto errout; |
537d8f93 | 1510 | |
d6b97550 | 1511 | retval = search_dirblock(bh, dir, fname, |
7845c049 TT |
1512 | block << EXT4_BLOCK_SIZE_BITS(sb), |
1513 | res_dir); | |
537d8f93 TT |
1514 | if (retval == 1) |
1515 | goto success; | |
af5bc92d | 1516 | brelse(bh); |
7845c049 | 1517 | if (retval == -1) { |
537d8f93 | 1518 | bh = ERR_PTR(ERR_BAD_DX_DIR); |
7845c049 TT |
1519 | goto errout; |
1520 | } | |
1521 | ||
ac27a0ec | 1522 | /* Check to see if we should continue to search */ |
5b643f9c | 1523 | retval = ext4_htree_next_block(dir, fname->hinfo.hash, frame, |
ac27a0ec DK |
1524 | frames, NULL); |
1525 | if (retval < 0) { | |
b03a2f7e AD |
1526 | ext4_warning_inode(dir, |
1527 | "error %d reading directory index block", | |
1528 | retval); | |
537d8f93 | 1529 | bh = ERR_PTR(retval); |
ac27a0ec DK |
1530 | goto errout; |
1531 | } | |
1532 | } while (retval == 1); | |
1533 | ||
537d8f93 | 1534 | bh = NULL; |
ac27a0ec | 1535 | errout: |
d6b97550 | 1536 | dxtrace(printk(KERN_DEBUG "%s not found\n", fname->usr_fname->name)); |
537d8f93 TT |
1537 | success: |
1538 | dx_release(frames); | |
1539 | return bh; | |
ac27a0ec | 1540 | } |
ac27a0ec | 1541 | |
00cd8dd3 | 1542 | static struct dentry *ext4_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) |
ac27a0ec | 1543 | { |
af5bc92d TT |
1544 | struct inode *inode; |
1545 | struct ext4_dir_entry_2 *de; | |
1546 | struct buffer_head *bh; | |
89904275 | 1547 | int err; |
ac27a0ec | 1548 | |
89904275 EB |
1549 | err = fscrypt_prepare_lookup(dir, dentry, flags); |
1550 | if (err) | |
1551 | return ERR_PTR(err); | |
28b4c263 | 1552 | |
89904275 EB |
1553 | if (dentry->d_name.len > EXT4_NAME_LEN) |
1554 | return ERR_PTR(-ENAMETOOLONG); | |
ac27a0ec | 1555 | |
32f7f22c | 1556 | bh = ext4_find_entry(dir, &dentry->d_name, &de, NULL); |
36de9286 TT |
1557 | if (IS_ERR(bh)) |
1558 | return (struct dentry *) bh; | |
ac27a0ec DK |
1559 | inode = NULL; |
1560 | if (bh) { | |
498e5f24 | 1561 | __u32 ino = le32_to_cpu(de->inode); |
af5bc92d | 1562 | brelse(bh); |
617ba13b | 1563 | if (!ext4_valid_inum(dir->i_sb, ino)) { |
24676da4 | 1564 | EXT4_ERROR_INODE(dir, "bad inode number: %u", ino); |
6a797d27 | 1565 | return ERR_PTR(-EFSCORRUPTED); |
a6c15c2b | 1566 | } |
7e936b73 | 1567 | if (unlikely(ino == dir->i_ino)) { |
a34e15cc DH |
1568 | EXT4_ERROR_INODE(dir, "'%pd' linked to parent dir", |
1569 | dentry); | |
6a797d27 | 1570 | return ERR_PTR(-EFSCORRUPTED); |
7e936b73 | 1571 | } |
f4bb2981 | 1572 | inode = ext4_iget_normal(dir->i_sb, ino); |
a9049376 AV |
1573 | if (inode == ERR_PTR(-ESTALE)) { |
1574 | EXT4_ERROR_INODE(dir, | |
1575 | "deleted inode referenced: %u", | |
1576 | ino); | |
6a797d27 | 1577 | return ERR_PTR(-EFSCORRUPTED); |
e6f009b0 | 1578 | } |
d9cdc903 | 1579 | if (!IS_ERR(inode) && ext4_encrypted_inode(dir) && |
ff978b09 | 1580 | (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) && |
a7550b30 | 1581 | !fscrypt_has_permitted_context(dir, inode)) { |
d9cdc903 | 1582 | ext4_warning(inode->i_sb, |
8d2ae1cb | 1583 | "Inconsistent encryption contexts: %lu/%lu", |
8c68084b | 1584 | dir->i_ino, inode->i_ino); |
dd01b690 | 1585 | iput(inode); |
d9cdc903 TT |
1586 | return ERR_PTR(-EPERM); |
1587 | } | |
ac27a0ec DK |
1588 | } |
1589 | return d_splice_alias(inode, dentry); | |
1590 | } | |
1591 | ||
1592 | ||
617ba13b | 1593 | struct dentry *ext4_get_parent(struct dentry *child) |
ac27a0ec | 1594 | { |
498e5f24 | 1595 | __u32 ino; |
26fe5750 | 1596 | static const struct qstr dotdot = QSTR_INIT("..", 2); |
617ba13b | 1597 | struct ext4_dir_entry_2 * de; |
ac27a0ec DK |
1598 | struct buffer_head *bh; |
1599 | ||
2b0143b5 | 1600 | bh = ext4_find_entry(d_inode(child), &dotdot, &de, NULL); |
36de9286 TT |
1601 | if (IS_ERR(bh)) |
1602 | return (struct dentry *) bh; | |
ac27a0ec DK |
1603 | if (!bh) |
1604 | return ERR_PTR(-ENOENT); | |
1605 | ino = le32_to_cpu(de->inode); | |
1606 | brelse(bh); | |
1607 | ||
fc64005c | 1608 | if (!ext4_valid_inum(child->d_sb, ino)) { |
2b0143b5 | 1609 | EXT4_ERROR_INODE(d_inode(child), |
24676da4 | 1610 | "bad parent inode number: %u", ino); |
6a797d27 | 1611 | return ERR_PTR(-EFSCORRUPTED); |
a6c15c2b VA |
1612 | } |
1613 | ||
fc64005c | 1614 | return d_obtain_alias(ext4_iget_normal(child->d_sb, ino)); |
ac27a0ec DK |
1615 | } |
1616 | ||
ef2b02d3 ES |
1617 | /* |
1618 | * Move count entries from end of map between two memory locations. | |
1619 | * Returns pointer to last entry moved. | |
1620 | */ | |
617ba13b | 1621 | static struct ext4_dir_entry_2 * |
3d0518f4 WY |
1622 | dx_move_dirents(char *from, char *to, struct dx_map_entry *map, int count, |
1623 | unsigned blocksize) | |
ac27a0ec DK |
1624 | { |
1625 | unsigned rec_len = 0; | |
1626 | ||
1627 | while (count--) { | |
60e6679e | 1628 | struct ext4_dir_entry_2 *de = (struct ext4_dir_entry_2 *) |
9aee2286 | 1629 | (from + (map->offs<<2)); |
617ba13b | 1630 | rec_len = EXT4_DIR_REC_LEN(de->name_len); |
ac27a0ec | 1631 | memcpy (to, de, rec_len); |
617ba13b | 1632 | ((struct ext4_dir_entry_2 *) to)->rec_len = |
3d0518f4 | 1633 | ext4_rec_len_to_disk(rec_len, blocksize); |
ac27a0ec DK |
1634 | de->inode = 0; |
1635 | map++; | |
1636 | to += rec_len; | |
1637 | } | |
617ba13b | 1638 | return (struct ext4_dir_entry_2 *) (to - rec_len); |
ac27a0ec DK |
1639 | } |
1640 | ||
ef2b02d3 ES |
1641 | /* |
1642 | * Compact each dir entry in the range to the minimal rec_len. | |
1643 | * Returns pointer to last entry in range. | |
1644 | */ | |
8bad4597 | 1645 | static struct ext4_dir_entry_2* dx_pack_dirents(char *base, unsigned blocksize) |
ac27a0ec | 1646 | { |
617ba13b | 1647 | struct ext4_dir_entry_2 *next, *to, *prev, *de = (struct ext4_dir_entry_2 *) base; |
ac27a0ec DK |
1648 | unsigned rec_len = 0; |
1649 | ||
1650 | prev = to = de; | |
8bad4597 | 1651 | while ((char*)de < base + blocksize) { |
3d0518f4 | 1652 | next = ext4_next_entry(de, blocksize); |
ac27a0ec | 1653 | if (de->inode && de->name_len) { |
617ba13b | 1654 | rec_len = EXT4_DIR_REC_LEN(de->name_len); |
ac27a0ec DK |
1655 | if (de > to) |
1656 | memmove(to, de, rec_len); | |
3d0518f4 | 1657 | to->rec_len = ext4_rec_len_to_disk(rec_len, blocksize); |
ac27a0ec | 1658 | prev = to; |
617ba13b | 1659 | to = (struct ext4_dir_entry_2 *) (((char *) to) + rec_len); |
ac27a0ec DK |
1660 | } |
1661 | de = next; | |
1662 | } | |
1663 | return prev; | |
1664 | } | |
1665 | ||
ef2b02d3 ES |
1666 | /* |
1667 | * Split a full leaf block to make room for a new dir entry. | |
1668 | * Allocate a new block, and move entries so that they are approx. equally full. | |
1669 | * Returns pointer to de in block into which the new entry will be inserted. | |
1670 | */ | |
617ba13b | 1671 | static struct ext4_dir_entry_2 *do_split(handle_t *handle, struct inode *dir, |
ac27a0ec | 1672 | struct buffer_head **bh,struct dx_frame *frame, |
f8b3b59d | 1673 | struct dx_hash_info *hinfo) |
ac27a0ec DK |
1674 | { |
1675 | unsigned blocksize = dir->i_sb->s_blocksize; | |
1676 | unsigned count, continued; | |
1677 | struct buffer_head *bh2; | |
725d26d3 | 1678 | ext4_lblk_t newblock; |
ac27a0ec DK |
1679 | u32 hash2; |
1680 | struct dx_map_entry *map; | |
1681 | char *data1 = (*bh)->b_data, *data2; | |
59e315b4 | 1682 | unsigned split, move, size; |
617ba13b | 1683 | struct ext4_dir_entry_2 *de = NULL, *de2; |
b0336e8d DW |
1684 | struct ext4_dir_entry_tail *t; |
1685 | int csum_size = 0; | |
59e315b4 | 1686 | int err = 0, i; |
ac27a0ec | 1687 | |
9aa5d32b | 1688 | if (ext4_has_metadata_csum(dir->i_sb)) |
b0336e8d DW |
1689 | csum_size = sizeof(struct ext4_dir_entry_tail); |
1690 | ||
0f70b406 TT |
1691 | bh2 = ext4_append(handle, dir, &newblock); |
1692 | if (IS_ERR(bh2)) { | |
ac27a0ec DK |
1693 | brelse(*bh); |
1694 | *bh = NULL; | |
f8b3b59d | 1695 | return (struct ext4_dir_entry_2 *) bh2; |
ac27a0ec DK |
1696 | } |
1697 | ||
1698 | BUFFER_TRACE(*bh, "get_write_access"); | |
617ba13b | 1699 | err = ext4_journal_get_write_access(handle, *bh); |
fedee54d DM |
1700 | if (err) |
1701 | goto journal_error; | |
1702 | ||
ac27a0ec | 1703 | BUFFER_TRACE(frame->bh, "get_write_access"); |
617ba13b | 1704 | err = ext4_journal_get_write_access(handle, frame->bh); |
ac27a0ec DK |
1705 | if (err) |
1706 | goto journal_error; | |
1707 | ||
1708 | data2 = bh2->b_data; | |
1709 | ||
1710 | /* create map in the end of data2 block */ | |
1711 | map = (struct dx_map_entry *) (data2 + blocksize); | |
1f3862b5 | 1712 | count = dx_make_map(dir, (struct ext4_dir_entry_2 *) data1, |
ac27a0ec DK |
1713 | blocksize, hinfo, map); |
1714 | map -= count; | |
af5bc92d | 1715 | dx_sort_map(map, count); |
ef2b02d3 ES |
1716 | /* Split the existing block in the middle, size-wise */ |
1717 | size = 0; | |
1718 | move = 0; | |
1719 | for (i = count-1; i >= 0; i--) { | |
1720 | /* is more than half of this entry in 2nd half of the block? */ | |
1721 | if (size + map[i].size/2 > blocksize/2) | |
1722 | break; | |
1723 | size += map[i].size; | |
1724 | move++; | |
1725 | } | |
1726 | /* map index at which we will split */ | |
1727 | split = count - move; | |
ac27a0ec DK |
1728 | hash2 = map[split].hash; |
1729 | continued = hash2 == map[split - 1].hash; | |
725d26d3 AK |
1730 | dxtrace(printk(KERN_INFO "Split block %lu at %x, %i/%i\n", |
1731 | (unsigned long)dx_get_block(frame->at), | |
1732 | hash2, split, count-split)); | |
ac27a0ec DK |
1733 | |
1734 | /* Fancy dance to stay within two buffers */ | |
1f3862b5 MH |
1735 | de2 = dx_move_dirents(data1, data2, map + split, count - split, |
1736 | blocksize); | |
af5bc92d | 1737 | de = dx_pack_dirents(data1, blocksize); |
b0336e8d DW |
1738 | de->rec_len = ext4_rec_len_to_disk(data1 + (blocksize - csum_size) - |
1739 | (char *) de, | |
3d0518f4 | 1740 | blocksize); |
b0336e8d DW |
1741 | de2->rec_len = ext4_rec_len_to_disk(data2 + (blocksize - csum_size) - |
1742 | (char *) de2, | |
3d0518f4 | 1743 | blocksize); |
b0336e8d DW |
1744 | if (csum_size) { |
1745 | t = EXT4_DIRENT_TAIL(data2, blocksize); | |
1746 | initialize_dirent_tail(t, blocksize); | |
1747 | ||
1748 | t = EXT4_DIRENT_TAIL(data1, blocksize); | |
1749 | initialize_dirent_tail(t, blocksize); | |
1750 | } | |
1751 | ||
b3098486 MH |
1752 | dxtrace(dx_show_leaf(dir, hinfo, (struct ext4_dir_entry_2 *) data1, |
1753 | blocksize, 1)); | |
1754 | dxtrace(dx_show_leaf(dir, hinfo, (struct ext4_dir_entry_2 *) data2, | |
1755 | blocksize, 1)); | |
ac27a0ec DK |
1756 | |
1757 | /* Which block gets the new entry? */ | |
f8b3b59d | 1758 | if (hinfo->hash >= hash2) { |
ac27a0ec DK |
1759 | swap(*bh, bh2); |
1760 | de = de2; | |
1761 | } | |
af5bc92d | 1762 | dx_insert_block(frame, hash2 + continued, newblock); |
b0336e8d | 1763 | err = ext4_handle_dirty_dirent_node(handle, dir, bh2); |
ac27a0ec DK |
1764 | if (err) |
1765 | goto journal_error; | |
dbe89444 | 1766 | err = ext4_handle_dirty_dx_node(handle, dir, frame->bh); |
ac27a0ec DK |
1767 | if (err) |
1768 | goto journal_error; | |
af5bc92d TT |
1769 | brelse(bh2); |
1770 | dxtrace(dx_show_index("frame", frame->entries)); | |
ac27a0ec | 1771 | return de; |
fedee54d DM |
1772 | |
1773 | journal_error: | |
1774 | brelse(*bh); | |
1775 | brelse(bh2); | |
1776 | *bh = NULL; | |
1777 | ext4_std_error(dir->i_sb, err); | |
f8b3b59d | 1778 | return ERR_PTR(err); |
ac27a0ec | 1779 | } |
ac27a0ec | 1780 | |
978fef91 TM |
1781 | int ext4_find_dest_de(struct inode *dir, struct inode *inode, |
1782 | struct buffer_head *bh, | |
1783 | void *buf, int buf_size, | |
5b643f9c | 1784 | struct ext4_filename *fname, |
978fef91 TM |
1785 | struct ext4_dir_entry_2 **dest_de) |
1786 | { | |
1787 | struct ext4_dir_entry_2 *de; | |
5b643f9c | 1788 | unsigned short reclen = EXT4_DIR_REC_LEN(fname_len(fname)); |
978fef91 TM |
1789 | int nlen, rlen; |
1790 | unsigned int offset = 0; | |
1791 | char *top; | |
1f3862b5 | 1792 | |
978fef91 TM |
1793 | de = (struct ext4_dir_entry_2 *)buf; |
1794 | top = buf + buf_size - reclen; | |
1795 | while ((char *) de <= top) { | |
1796 | if (ext4_check_dir_entry(dir, NULL, de, bh, | |
d9b9f8d5 EB |
1797 | buf, buf_size, offset)) |
1798 | return -EFSCORRUPTED; | |
1799 | if (ext4_match(fname, de)) | |
1800 | return -EEXIST; | |
978fef91 TM |
1801 | nlen = EXT4_DIR_REC_LEN(de->name_len); |
1802 | rlen = ext4_rec_len_from_disk(de->rec_len, buf_size); | |
1803 | if ((de->inode ? rlen - nlen : rlen) >= reclen) | |
1804 | break; | |
1805 | de = (struct ext4_dir_entry_2 *)((char *)de + rlen); | |
1806 | offset += rlen; | |
1807 | } | |
1f3862b5 | 1808 | if ((char *) de > top) |
d9b9f8d5 EB |
1809 | return -ENOSPC; |
1810 | ||
1811 | *dest_de = de; | |
1812 | return 0; | |
978fef91 TM |
1813 | } |
1814 | ||
1bc0af60 EB |
1815 | void ext4_insert_dentry(struct inode *inode, |
1816 | struct ext4_dir_entry_2 *de, | |
1817 | int buf_size, | |
1818 | struct ext4_filename *fname) | |
978fef91 TM |
1819 | { |
1820 | ||
1821 | int nlen, rlen; | |
1822 | ||
1823 | nlen = EXT4_DIR_REC_LEN(de->name_len); | |
1824 | rlen = ext4_rec_len_from_disk(de->rec_len, buf_size); | |
1825 | if (de->inode) { | |
1826 | struct ext4_dir_entry_2 *de1 = | |
4bdfc873 | 1827 | (struct ext4_dir_entry_2 *)((char *)de + nlen); |
978fef91 TM |
1828 | de1->rec_len = ext4_rec_len_to_disk(rlen - nlen, buf_size); |
1829 | de->rec_len = ext4_rec_len_to_disk(nlen, buf_size); | |
1830 | de = de1; | |
1831 | } | |
1832 | de->file_type = EXT4_FT_UNKNOWN; | |
1833 | de->inode = cpu_to_le32(inode->i_ino); | |
1834 | ext4_set_de_type(inode->i_sb, de, inode->i_mode); | |
5b643f9c TT |
1835 | de->name_len = fname_len(fname); |
1836 | memcpy(de->name, fname_name(fname), fname_len(fname)); | |
978fef91 | 1837 | } |
4bdfc873 | 1838 | |
ac27a0ec DK |
1839 | /* |
1840 | * Add a new entry into a directory (leaf) block. If de is non-NULL, | |
1841 | * it points to a directory entry which is guaranteed to be large | |
1842 | * enough for new directory entry. If de is NULL, then | |
1843 | * add_dirent_to_buf will attempt search the directory block for | |
1844 | * space. It will return -ENOSPC if no space is available, and -EIO | |
1845 | * and -EEXIST if directory entry already exists. | |
ac27a0ec | 1846 | */ |
5b643f9c TT |
1847 | static int add_dirent_to_buf(handle_t *handle, struct ext4_filename *fname, |
1848 | struct inode *dir, | |
617ba13b | 1849 | struct inode *inode, struct ext4_dir_entry_2 *de, |
af5bc92d | 1850 | struct buffer_head *bh) |
ac27a0ec | 1851 | { |
3d0518f4 | 1852 | unsigned int blocksize = dir->i_sb->s_blocksize; |
b0336e8d | 1853 | int csum_size = 0; |
978fef91 | 1854 | int err; |
b0336e8d | 1855 | |
9aa5d32b | 1856 | if (ext4_has_metadata_csum(inode->i_sb)) |
b0336e8d | 1857 | csum_size = sizeof(struct ext4_dir_entry_tail); |
ac27a0ec | 1858 | |
ac27a0ec | 1859 | if (!de) { |
5b643f9c TT |
1860 | err = ext4_find_dest_de(dir, inode, bh, bh->b_data, |
1861 | blocksize - csum_size, fname, &de); | |
978fef91 TM |
1862 | if (err) |
1863 | return err; | |
ac27a0ec DK |
1864 | } |
1865 | BUFFER_TRACE(bh, "get_write_access"); | |
617ba13b | 1866 | err = ext4_journal_get_write_access(handle, bh); |
ac27a0ec | 1867 | if (err) { |
617ba13b | 1868 | ext4_std_error(dir->i_sb, err); |
ac27a0ec DK |
1869 | return err; |
1870 | } | |
1871 | ||
1bc0af60 EB |
1872 | /* By now the buffer is marked for journaling */ |
1873 | ext4_insert_dentry(inode, de, blocksize, fname); | |
978fef91 | 1874 | |
ac27a0ec DK |
1875 | /* |
1876 | * XXX shouldn't update any times until successful | |
1877 | * completion of syscall, but too many callers depend | |
1878 | * on this. | |
1879 | * | |
1880 | * XXX similarly, too many callers depend on | |
617ba13b | 1881 | * ext4_new_inode() setting the times, but error |
ac27a0ec DK |
1882 | * recovery deletes the inode, so the worst that can |
1883 | * happen is that the times are slightly out of date | |
1884 | * and/or different from the directory change time. | |
1885 | */ | |
eeca7ea1 | 1886 | dir->i_mtime = dir->i_ctime = current_time(dir); |
617ba13b | 1887 | ext4_update_dx_flag(dir); |
e08ac99f | 1888 | inode_inc_iversion(dir); |
617ba13b | 1889 | ext4_mark_inode_dirty(handle, dir); |
0390131b | 1890 | BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata"); |
b0336e8d | 1891 | err = ext4_handle_dirty_dirent_node(handle, dir, bh); |
ac27a0ec | 1892 | if (err) |
617ba13b | 1893 | ext4_std_error(dir->i_sb, err); |
ac27a0ec DK |
1894 | return 0; |
1895 | } | |
1896 | ||
ac27a0ec DK |
1897 | /* |
1898 | * This converts a one block unindexed directory to a 3 block indexed | |
1899 | * directory, and adds the dentry to the indexed directory. | |
1900 | */ | |
5b643f9c | 1901 | static int make_indexed_dir(handle_t *handle, struct ext4_filename *fname, |
56a04915 | 1902 | struct inode *dir, |
ac27a0ec DK |
1903 | struct inode *inode, struct buffer_head *bh) |
1904 | { | |
ac27a0ec DK |
1905 | struct buffer_head *bh2; |
1906 | struct dx_root *root; | |
e08ac99f | 1907 | struct dx_frame frames[EXT4_HTREE_LEVEL], *frame; |
ac27a0ec | 1908 | struct dx_entry *entries; |
617ba13b | 1909 | struct ext4_dir_entry_2 *de, *de2; |
b0336e8d | 1910 | struct ext4_dir_entry_tail *t; |
ac27a0ec DK |
1911 | char *data1, *top; |
1912 | unsigned len; | |
1913 | int retval; | |
1914 | unsigned blocksize; | |
725d26d3 | 1915 | ext4_lblk_t block; |
ac27a0ec | 1916 | struct fake_dirent *fde; |
4bdfc873 MH |
1917 | int csum_size = 0; |
1918 | ||
9aa5d32b | 1919 | if (ext4_has_metadata_csum(inode->i_sb)) |
b0336e8d | 1920 | csum_size = sizeof(struct ext4_dir_entry_tail); |
ac27a0ec DK |
1921 | |
1922 | blocksize = dir->i_sb->s_blocksize; | |
e6b8bc09 | 1923 | dxtrace(printk(KERN_DEBUG "Creating index: inode %lu\n", dir->i_ino)); |
5d601255 | 1924 | BUFFER_TRACE(bh, "get_write_access"); |
617ba13b | 1925 | retval = ext4_journal_get_write_access(handle, bh); |
ac27a0ec | 1926 | if (retval) { |
617ba13b | 1927 | ext4_std_error(dir->i_sb, retval); |
ac27a0ec DK |
1928 | brelse(bh); |
1929 | return retval; | |
1930 | } | |
1931 | root = (struct dx_root *) bh->b_data; | |
1932 | ||
e6b8bc09 TT |
1933 | /* The 0th block becomes the root, move the dirents out */ |
1934 | fde = &root->dotdot; | |
1935 | de = (struct ext4_dir_entry_2 *)((char *)fde + | |
3d0518f4 | 1936 | ext4_rec_len_from_disk(fde->rec_len, blocksize)); |
e6b8bc09 | 1937 | if ((char *) de >= (((char *) root) + blocksize)) { |
24676da4 | 1938 | EXT4_ERROR_INODE(dir, "invalid rec_len for '..'"); |
e6b8bc09 | 1939 | brelse(bh); |
6a797d27 | 1940 | return -EFSCORRUPTED; |
e6b8bc09 | 1941 | } |
b0336e8d | 1942 | len = ((char *) root) + (blocksize - csum_size) - (char *) de; |
e6b8bc09 TT |
1943 | |
1944 | /* Allocate new block for the 0th block's dirents */ | |
0f70b406 TT |
1945 | bh2 = ext4_append(handle, dir, &block); |
1946 | if (IS_ERR(bh2)) { | |
ac27a0ec | 1947 | brelse(bh); |
0f70b406 | 1948 | return PTR_ERR(bh2); |
ac27a0ec | 1949 | } |
12e9b892 | 1950 | ext4_set_inode_flag(dir, EXT4_INODE_INDEX); |
ac27a0ec DK |
1951 | data1 = bh2->b_data; |
1952 | ||
ac27a0ec | 1953 | memcpy (data1, de, len); |
617ba13b | 1954 | de = (struct ext4_dir_entry_2 *) data1; |
ac27a0ec | 1955 | top = data1 + len; |
3d0518f4 | 1956 | while ((char *)(de2 = ext4_next_entry(de, blocksize)) < top) |
ac27a0ec | 1957 | de = de2; |
b0336e8d DW |
1958 | de->rec_len = ext4_rec_len_to_disk(data1 + (blocksize - csum_size) - |
1959 | (char *) de, | |
3d0518f4 | 1960 | blocksize); |
b0336e8d DW |
1961 | |
1962 | if (csum_size) { | |
1963 | t = EXT4_DIRENT_TAIL(data1, blocksize); | |
1964 | initialize_dirent_tail(t, blocksize); | |
1965 | } | |
1966 | ||
ac27a0ec | 1967 | /* Initialize the root; the dot dirents already exist */ |
617ba13b | 1968 | de = (struct ext4_dir_entry_2 *) (&root->dotdot); |
3d0518f4 WY |
1969 | de->rec_len = ext4_rec_len_to_disk(blocksize - EXT4_DIR_REC_LEN(2), |
1970 | blocksize); | |
ac27a0ec DK |
1971 | memset (&root->info, 0, sizeof(root->info)); |
1972 | root->info.info_length = sizeof(root->info); | |
617ba13b | 1973 | root->info.hash_version = EXT4_SB(dir->i_sb)->s_def_hash_version; |
ac27a0ec | 1974 | entries = root->entries; |
af5bc92d TT |
1975 | dx_set_block(entries, 1); |
1976 | dx_set_count(entries, 1); | |
1977 | dx_set_limit(entries, dx_root_limit(dir, sizeof(root->info))); | |
ac27a0ec DK |
1978 | |
1979 | /* Initialize as for dx_probe */ | |
5b643f9c TT |
1980 | fname->hinfo.hash_version = root->info.hash_version; |
1981 | if (fname->hinfo.hash_version <= DX_HASH_TEA) | |
1982 | fname->hinfo.hash_version += EXT4_SB(dir->i_sb)->s_hash_unsigned; | |
1983 | fname->hinfo.seed = EXT4_SB(dir->i_sb)->s_hash_seed; | |
1984 | ext4fs_dirhash(fname_name(fname), fname_len(fname), &fname->hinfo); | |
1985 | ||
6050d47a | 1986 | memset(frames, 0, sizeof(frames)); |
ac27a0ec DK |
1987 | frame = frames; |
1988 | frame->entries = entries; | |
1989 | frame->at = entries; | |
1990 | frame->bh = bh; | |
6976a6f2 | 1991 | |
6050d47a JK |
1992 | retval = ext4_handle_dirty_dx_node(handle, dir, frame->bh); |
1993 | if (retval) | |
1994 | goto out_frames; | |
e81d4477 | 1995 | retval = ext4_handle_dirty_dirent_node(handle, dir, bh2); |
6050d47a JK |
1996 | if (retval) |
1997 | goto out_frames; | |
6976a6f2 | 1998 | |
e81d4477 | 1999 | de = do_split(handle,dir, &bh2, frame, &fname->hinfo); |
f8b3b59d | 2000 | if (IS_ERR(de)) { |
6050d47a JK |
2001 | retval = PTR_ERR(de); |
2002 | goto out_frames; | |
7ad8e4e6 | 2003 | } |
ac27a0ec | 2004 | |
e81d4477 | 2005 | retval = add_dirent_to_buf(handle, fname, dir, inode, de, bh2); |
6050d47a JK |
2006 | out_frames: |
2007 | /* | |
2008 | * Even if the block split failed, we have to properly write | |
2009 | * out all the changes we did so far. Otherwise we can end up | |
2010 | * with corrupted filesystem. | |
2011 | */ | |
e81d4477 | 2012 | if (retval) |
2013 | ext4_mark_inode_dirty(handle, dir); | |
6050d47a | 2014 | dx_release(frames); |
e81d4477 | 2015 | brelse(bh2); |
6050d47a | 2016 | return retval; |
ac27a0ec | 2017 | } |
ac27a0ec DK |
2018 | |
2019 | /* | |
617ba13b | 2020 | * ext4_add_entry() |
ac27a0ec DK |
2021 | * |
2022 | * adds a file entry to the specified directory, using the same | |
617ba13b | 2023 | * semantics as ext4_find_entry(). It returns NULL if it failed. |
ac27a0ec DK |
2024 | * |
2025 | * NOTE!! The inode part of 'de' is left at 0 - which means you | |
2026 | * may not sleep between calling this and putting something into | |
2027 | * the entry, as someone else might have used it while you slept. | |
2028 | */ | |
af5bc92d TT |
2029 | static int ext4_add_entry(handle_t *handle, struct dentry *dentry, |
2030 | struct inode *inode) | |
ac27a0ec | 2031 | { |
2b0143b5 | 2032 | struct inode *dir = d_inode(dentry->d_parent); |
e12fb972 | 2033 | struct buffer_head *bh = NULL; |
617ba13b | 2034 | struct ext4_dir_entry_2 *de; |
b0336e8d | 2035 | struct ext4_dir_entry_tail *t; |
af5bc92d | 2036 | struct super_block *sb; |
5b643f9c | 2037 | struct ext4_filename fname; |
ac27a0ec | 2038 | int retval; |
ac27a0ec | 2039 | int dx_fallback=0; |
ac27a0ec | 2040 | unsigned blocksize; |
725d26d3 | 2041 | ext4_lblk_t block, blocks; |
b0336e8d DW |
2042 | int csum_size = 0; |
2043 | ||
9aa5d32b | 2044 | if (ext4_has_metadata_csum(inode->i_sb)) |
b0336e8d | 2045 | csum_size = sizeof(struct ext4_dir_entry_tail); |
ac27a0ec DK |
2046 | |
2047 | sb = dir->i_sb; | |
2048 | blocksize = sb->s_blocksize; | |
2049 | if (!dentry->d_name.len) | |
2050 | return -EINVAL; | |
3c47d541 | 2051 | |
5b643f9c TT |
2052 | retval = ext4_fname_setup_filename(dir, &dentry->d_name, 0, &fname); |
2053 | if (retval) | |
2054 | return retval; | |
2055 | ||
3c47d541 | 2056 | if (ext4_has_inline_data(dir)) { |
56a04915 | 2057 | retval = ext4_try_add_inline_entry(handle, &fname, dir, inode); |
3c47d541 | 2058 | if (retval < 0) |
5b643f9c | 2059 | goto out; |
3c47d541 TM |
2060 | if (retval == 1) { |
2061 | retval = 0; | |
e12fb972 | 2062 | goto out; |
3c47d541 TM |
2063 | } |
2064 | } | |
2065 | ||
ac27a0ec | 2066 | if (is_dx(dir)) { |
56a04915 | 2067 | retval = ext4_dx_add_entry(handle, &fname, dir, inode); |
ac27a0ec | 2068 | if (!retval || (retval != ERR_BAD_DX_DIR)) |
e12fb972 | 2069 | goto out; |
12e9b892 | 2070 | ext4_clear_inode_flag(dir, EXT4_INODE_INDEX); |
ac27a0ec | 2071 | dx_fallback++; |
617ba13b | 2072 | ext4_mark_inode_dirty(handle, dir); |
ac27a0ec | 2073 | } |
ac27a0ec | 2074 | blocks = dir->i_size >> sb->s_blocksize_bits; |
498e5f24 | 2075 | for (block = 0; block < blocks; block++) { |
dc6982ff | 2076 | bh = ext4_read_dirblock(dir, block, DIRENT); |
5b643f9c TT |
2077 | if (IS_ERR(bh)) { |
2078 | retval = PTR_ERR(bh); | |
2079 | bh = NULL; | |
2080 | goto out; | |
2081 | } | |
2082 | retval = add_dirent_to_buf(handle, &fname, dir, inode, | |
2083 | NULL, bh); | |
e12fb972 LC |
2084 | if (retval != -ENOSPC) |
2085 | goto out; | |
ac27a0ec | 2086 | |
ac27a0ec | 2087 | if (blocks == 1 && !dx_fallback && |
e2b911c5 | 2088 | ext4_has_feature_dir_index(sb)) { |
56a04915 | 2089 | retval = make_indexed_dir(handle, &fname, dir, |
5b643f9c | 2090 | inode, bh); |
e12fb972 LC |
2091 | bh = NULL; /* make_indexed_dir releases bh */ |
2092 | goto out; | |
2093 | } | |
ac27a0ec DK |
2094 | brelse(bh); |
2095 | } | |
0f70b406 | 2096 | bh = ext4_append(handle, dir, &block); |
5b643f9c TT |
2097 | if (IS_ERR(bh)) { |
2098 | retval = PTR_ERR(bh); | |
2099 | bh = NULL; | |
2100 | goto out; | |
2101 | } | |
617ba13b | 2102 | de = (struct ext4_dir_entry_2 *) bh->b_data; |
ac27a0ec | 2103 | de->inode = 0; |
b0336e8d DW |
2104 | de->rec_len = ext4_rec_len_to_disk(blocksize - csum_size, blocksize); |
2105 | ||
2106 | if (csum_size) { | |
2107 | t = EXT4_DIRENT_TAIL(bh->b_data, blocksize); | |
2108 | initialize_dirent_tail(t, blocksize); | |
2109 | } | |
2110 | ||
5b643f9c | 2111 | retval = add_dirent_to_buf(handle, &fname, dir, inode, de, bh); |
e12fb972 | 2112 | out: |
5b643f9c | 2113 | ext4_fname_free_filename(&fname); |
2de770a4 | 2114 | brelse(bh); |
14ece102 FM |
2115 | if (retval == 0) |
2116 | ext4_set_inode_state(inode, EXT4_STATE_NEWENTRY); | |
2de770a4 | 2117 | return retval; |
ac27a0ec DK |
2118 | } |
2119 | ||
ac27a0ec DK |
2120 | /* |
2121 | * Returns 0 for success, or a negative error value | |
2122 | */ | |
5b643f9c | 2123 | static int ext4_dx_add_entry(handle_t *handle, struct ext4_filename *fname, |
56a04915 | 2124 | struct inode *dir, struct inode *inode) |
ac27a0ec | 2125 | { |
e08ac99f | 2126 | struct dx_frame frames[EXT4_HTREE_LEVEL], *frame; |
ac27a0ec | 2127 | struct dx_entry *entries, *at; |
af5bc92d | 2128 | struct buffer_head *bh; |
af5bc92d | 2129 | struct super_block *sb = dir->i_sb; |
617ba13b | 2130 | struct ext4_dir_entry_2 *de; |
e08ac99f | 2131 | int restart; |
ac27a0ec DK |
2132 | int err; |
2133 | ||
e08ac99f AB |
2134 | again: |
2135 | restart = 0; | |
5b643f9c | 2136 | frame = dx_probe(fname, dir, NULL, frames); |
dd73b5d5 TT |
2137 | if (IS_ERR(frame)) |
2138 | return PTR_ERR(frame); | |
ac27a0ec DK |
2139 | entries = frame->entries; |
2140 | at = frame->at; | |
dc6982ff TT |
2141 | bh = ext4_read_dirblock(dir, dx_get_block(frame->at), DIRENT); |
2142 | if (IS_ERR(bh)) { | |
2143 | err = PTR_ERR(bh); | |
2144 | bh = NULL; | |
ac27a0ec | 2145 | goto cleanup; |
6d1ab10e | 2146 | } |
ac27a0ec DK |
2147 | |
2148 | BUFFER_TRACE(bh, "get_write_access"); | |
617ba13b | 2149 | err = ext4_journal_get_write_access(handle, bh); |
ac27a0ec DK |
2150 | if (err) |
2151 | goto journal_error; | |
2152 | ||
5b643f9c | 2153 | err = add_dirent_to_buf(handle, fname, dir, inode, NULL, bh); |
2de770a4 | 2154 | if (err != -ENOSPC) |
ac27a0ec | 2155 | goto cleanup; |
ac27a0ec | 2156 | |
e08ac99f | 2157 | err = 0; |
ac27a0ec | 2158 | /* Block full, should compress but for now just split */ |
4776004f | 2159 | dxtrace(printk(KERN_DEBUG "using %u of %u node entries\n", |
ac27a0ec DK |
2160 | dx_get_count(entries), dx_get_limit(entries))); |
2161 | /* Need to split index? */ | |
2162 | if (dx_get_count(entries) == dx_get_limit(entries)) { | |
725d26d3 | 2163 | ext4_lblk_t newblock; |
e08ac99f AB |
2164 | int levels = frame - frames + 1; |
2165 | unsigned int icount; | |
2166 | int add_level = 1; | |
ac27a0ec DK |
2167 | struct dx_entry *entries2; |
2168 | struct dx_node *node2; | |
2169 | struct buffer_head *bh2; | |
2170 | ||
e08ac99f AB |
2171 | while (frame > frames) { |
2172 | if (dx_get_count((frame - 1)->entries) < | |
2173 | dx_get_limit((frame - 1)->entries)) { | |
2174 | add_level = 0; | |
2175 | break; | |
2176 | } | |
2177 | frame--; /* split higher index block */ | |
2178 | at = frame->at; | |
2179 | entries = frame->entries; | |
2180 | restart = 1; | |
2181 | } | |
2182 | if (add_level && levels == ext4_dir_htree_level(sb)) { | |
2183 | ext4_warning(sb, "Directory (ino: %lu) index full, " | |
2184 | "reach max htree level :%d", | |
2185 | dir->i_ino, levels); | |
2186 | if (ext4_dir_htree_level(sb) < EXT4_HTREE_LEVEL) { | |
2187 | ext4_warning(sb, "Large directory feature is " | |
2188 | "not enabled on this " | |
2189 | "filesystem"); | |
2190 | } | |
ac27a0ec DK |
2191 | err = -ENOSPC; |
2192 | goto cleanup; | |
2193 | } | |
e08ac99f | 2194 | icount = dx_get_count(entries); |
0f70b406 TT |
2195 | bh2 = ext4_append(handle, dir, &newblock); |
2196 | if (IS_ERR(bh2)) { | |
2197 | err = PTR_ERR(bh2); | |
ac27a0ec | 2198 | goto cleanup; |
0f70b406 | 2199 | } |
ac27a0ec DK |
2200 | node2 = (struct dx_node *)(bh2->b_data); |
2201 | entries2 = node2->entries; | |
1f7bebb9 | 2202 | memset(&node2->fake, 0, sizeof(struct fake_dirent)); |
3d0518f4 WY |
2203 | node2->fake.rec_len = ext4_rec_len_to_disk(sb->s_blocksize, |
2204 | sb->s_blocksize); | |
ac27a0ec | 2205 | BUFFER_TRACE(frame->bh, "get_write_access"); |
617ba13b | 2206 | err = ext4_journal_get_write_access(handle, frame->bh); |
ac27a0ec DK |
2207 | if (err) |
2208 | goto journal_error; | |
e08ac99f | 2209 | if (!add_level) { |
ac27a0ec DK |
2210 | unsigned icount1 = icount/2, icount2 = icount - icount1; |
2211 | unsigned hash2 = dx_get_hash(entries + icount1); | |
4776004f TT |
2212 | dxtrace(printk(KERN_DEBUG "Split index %i/%i\n", |
2213 | icount1, icount2)); | |
ac27a0ec DK |
2214 | |
2215 | BUFFER_TRACE(frame->bh, "get_write_access"); /* index root */ | |
617ba13b | 2216 | err = ext4_journal_get_write_access(handle, |
e08ac99f | 2217 | (frame - 1)->bh); |
ac27a0ec DK |
2218 | if (err) |
2219 | goto journal_error; | |
2220 | ||
af5bc92d TT |
2221 | memcpy((char *) entries2, (char *) (entries + icount1), |
2222 | icount2 * sizeof(struct dx_entry)); | |
2223 | dx_set_count(entries, icount1); | |
2224 | dx_set_count(entries2, icount2); | |
2225 | dx_set_limit(entries2, dx_node_limit(dir)); | |
ac27a0ec DK |
2226 | |
2227 | /* Which index block gets the new entry? */ | |
2228 | if (at - entries >= icount1) { | |
2229 | frame->at = at = at - entries - icount1 + entries2; | |
2230 | frame->entries = entries = entries2; | |
2231 | swap(frame->bh, bh2); | |
2232 | } | |
e08ac99f AB |
2233 | dx_insert_block((frame - 1), hash2, newblock); |
2234 | dxtrace(dx_show_index("node", frame->entries)); | |
af5bc92d | 2235 | dxtrace(dx_show_index("node", |
ac27a0ec | 2236 | ((struct dx_node *) bh2->b_data)->entries)); |
dbe89444 | 2237 | err = ext4_handle_dirty_dx_node(handle, dir, bh2); |
ac27a0ec DK |
2238 | if (err) |
2239 | goto journal_error; | |
2240 | brelse (bh2); | |
e08ac99f AB |
2241 | err = ext4_handle_dirty_dx_node(handle, dir, |
2242 | (frame - 1)->bh); | |
2243 | if (err) | |
2244 | goto journal_error; | |
2245 | if (restart) { | |
2246 | err = ext4_handle_dirty_dx_node(handle, dir, | |
2247 | frame->bh); | |
2248 | goto journal_error; | |
2249 | } | |
ac27a0ec | 2250 | } else { |
e08ac99f | 2251 | struct dx_root *dxroot; |
ac27a0ec DK |
2252 | memcpy((char *) entries2, (char *) entries, |
2253 | icount * sizeof(struct dx_entry)); | |
2254 | dx_set_limit(entries2, dx_node_limit(dir)); | |
2255 | ||
2256 | /* Set up root */ | |
2257 | dx_set_count(entries, 1); | |
2258 | dx_set_block(entries + 0, newblock); | |
e08ac99f AB |
2259 | dxroot = (struct dx_root *)frames[0].bh->b_data; |
2260 | dxroot->info.indirect_levels += 1; | |
2261 | dxtrace(printk(KERN_DEBUG | |
2262 | "Creating %d level index...\n", | |
2263 | info->indirect_levels)); | |
2264 | err = ext4_handle_dirty_dx_node(handle, dir, frame->bh); | |
ac27a0ec DK |
2265 | if (err) |
2266 | goto journal_error; | |
e08ac99f AB |
2267 | err = ext4_handle_dirty_dx_node(handle, dir, bh2); |
2268 | brelse(bh2); | |
2269 | restart = 1; | |
2270 | goto journal_error; | |
b4097142 | 2271 | } |
ac27a0ec | 2272 | } |
5b643f9c | 2273 | de = do_split(handle, dir, &bh, frame, &fname->hinfo); |
f8b3b59d TT |
2274 | if (IS_ERR(de)) { |
2275 | err = PTR_ERR(de); | |
ac27a0ec | 2276 | goto cleanup; |
f8b3b59d | 2277 | } |
5b643f9c | 2278 | err = add_dirent_to_buf(handle, fname, dir, inode, de, bh); |
ac27a0ec DK |
2279 | goto cleanup; |
2280 | ||
2281 | journal_error: | |
e08ac99f | 2282 | ext4_std_error(dir->i_sb, err); /* this is a no-op if err == 0 */ |
ac27a0ec | 2283 | cleanup: |
b1deefc9 | 2284 | brelse(bh); |
ac27a0ec | 2285 | dx_release(frames); |
e08ac99f AB |
2286 | /* @restart is true means htree-path has been changed, we need to |
2287 | * repeat dx_probe() to find out valid htree-path | |
2288 | */ | |
2289 | if (restart && err == 0) | |
2290 | goto again; | |
ac27a0ec DK |
2291 | return err; |
2292 | } | |
ac27a0ec DK |
2293 | |
2294 | /* | |
05019a9e TM |
2295 | * ext4_generic_delete_entry deletes a directory entry by merging it |
2296 | * with the previous entry | |
ac27a0ec | 2297 | */ |
05019a9e TM |
2298 | int ext4_generic_delete_entry(handle_t *handle, |
2299 | struct inode *dir, | |
2300 | struct ext4_dir_entry_2 *de_del, | |
2301 | struct buffer_head *bh, | |
2302 | void *entry_buf, | |
2303 | int buf_size, | |
2304 | int csum_size) | |
ac27a0ec | 2305 | { |
af5bc92d | 2306 | struct ext4_dir_entry_2 *de, *pde; |
3d0518f4 | 2307 | unsigned int blocksize = dir->i_sb->s_blocksize; |
05019a9e | 2308 | int i; |
b0336e8d | 2309 | |
ac27a0ec DK |
2310 | i = 0; |
2311 | pde = NULL; | |
05019a9e TM |
2312 | de = (struct ext4_dir_entry_2 *)entry_buf; |
2313 | while (i < buf_size - csum_size) { | |
226ba972 TM |
2314 | if (ext4_check_dir_entry(dir, NULL, de, bh, |
2315 | bh->b_data, bh->b_size, i)) | |
6a797d27 | 2316 | return -EFSCORRUPTED; |
ac27a0ec | 2317 | if (de == de_del) { |
ac27a0ec | 2318 | if (pde) |
a72d7f83 | 2319 | pde->rec_len = ext4_rec_len_to_disk( |
3d0518f4 WY |
2320 | ext4_rec_len_from_disk(pde->rec_len, |
2321 | blocksize) + | |
2322 | ext4_rec_len_from_disk(de->rec_len, | |
2323 | blocksize), | |
2324 | blocksize); | |
ac27a0ec DK |
2325 | else |
2326 | de->inode = 0; | |
e08ac99f | 2327 | inode_inc_iversion(dir); |
ac27a0ec DK |
2328 | return 0; |
2329 | } | |
3d0518f4 | 2330 | i += ext4_rec_len_from_disk(de->rec_len, blocksize); |
ac27a0ec | 2331 | pde = de; |
3d0518f4 | 2332 | de = ext4_next_entry(de, blocksize); |
ac27a0ec DK |
2333 | } |
2334 | return -ENOENT; | |
2335 | } | |
2336 | ||
05019a9e TM |
2337 | static int ext4_delete_entry(handle_t *handle, |
2338 | struct inode *dir, | |
2339 | struct ext4_dir_entry_2 *de_del, | |
2340 | struct buffer_head *bh) | |
2341 | { | |
2342 | int err, csum_size = 0; | |
2343 | ||
9f40fe54 TM |
2344 | if (ext4_has_inline_data(dir)) { |
2345 | int has_inline_data = 1; | |
2346 | err = ext4_delete_inline_entry(handle, dir, de_del, bh, | |
2347 | &has_inline_data); | |
2348 | if (has_inline_data) | |
2349 | return err; | |
2350 | } | |
2351 | ||
9aa5d32b | 2352 | if (ext4_has_metadata_csum(dir->i_sb)) |
05019a9e TM |
2353 | csum_size = sizeof(struct ext4_dir_entry_tail); |
2354 | ||
2355 | BUFFER_TRACE(bh, "get_write_access"); | |
2356 | err = ext4_journal_get_write_access(handle, bh); | |
2357 | if (unlikely(err)) | |
2358 | goto out; | |
2359 | ||
2360 | err = ext4_generic_delete_entry(handle, dir, de_del, | |
2361 | bh, bh->b_data, | |
2362 | dir->i_sb->s_blocksize, csum_size); | |
2363 | if (err) | |
2364 | goto out; | |
2365 | ||
2366 | BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata"); | |
2367 | err = ext4_handle_dirty_dirent_node(handle, dir, bh); | |
2368 | if (unlikely(err)) | |
2369 | goto out; | |
2370 | ||
2371 | return 0; | |
2372 | out: | |
2373 | if (err != -ENOENT) | |
2374 | ext4_std_error(dir->i_sb, err); | |
2375 | return err; | |
2376 | } | |
2377 | ||
f8628a14 | 2378 | /* |
c7414892 AD |
2379 | * Set directory link count to 1 if nlinks > EXT4_LINK_MAX, or if nlinks == 2 |
2380 | * since this indicates that nlinks count was previously 1 to avoid overflowing | |
2381 | * the 16-bit i_links_count field on disk. Directories with i_nlink == 1 mean | |
2382 | * that subdirectory link counts are not being maintained accurately. | |
2383 | * | |
2384 | * The caller has already checked for i_nlink overflow in case the DIR_LINK | |
2385 | * feature is not enabled and returned -EMLINK. The is_dx() check is a proxy | |
2386 | * for checking S_ISDIR(inode) (since the INODE_INDEX feature will not be set | |
2387 | * on regular files) and to avoid creating huge/slow non-HTREE directories. | |
f8628a14 AD |
2388 | */ |
2389 | static void ext4_inc_count(handle_t *handle, struct inode *inode) | |
2390 | { | |
2391 | inc_nlink(inode); | |
c7414892 AD |
2392 | if (is_dx(inode) && |
2393 | (inode->i_nlink > EXT4_LINK_MAX || inode->i_nlink == 2)) | |
2394 | set_nlink(inode, 1); | |
f8628a14 AD |
2395 | } |
2396 | ||
2397 | /* | |
2398 | * If a directory had nlink == 1, then we should let it be 1. This indicates | |
2399 | * directory has >EXT4_LINK_MAX subdirs. | |
2400 | */ | |
2401 | static void ext4_dec_count(handle_t *handle, struct inode *inode) | |
2402 | { | |
909a4cf1 AD |
2403 | if (!S_ISDIR(inode->i_mode) || inode->i_nlink > 2) |
2404 | drop_nlink(inode); | |
f8628a14 AD |
2405 | } |
2406 | ||
2407 | ||
617ba13b | 2408 | static int ext4_add_nondir(handle_t *handle, |
ac27a0ec DK |
2409 | struct dentry *dentry, struct inode *inode) |
2410 | { | |
617ba13b | 2411 | int err = ext4_add_entry(handle, dentry, inode); |
ac27a0ec | 2412 | if (!err) { |
617ba13b | 2413 | ext4_mark_inode_dirty(handle, inode); |
6b38e842 | 2414 | unlock_new_inode(inode); |
8fc37ec5 | 2415 | d_instantiate(dentry, inode); |
ac27a0ec DK |
2416 | return 0; |
2417 | } | |
731b9a54 | 2418 | drop_nlink(inode); |
6b38e842 | 2419 | unlock_new_inode(inode); |
ac27a0ec DK |
2420 | iput(inode); |
2421 | return err; | |
2422 | } | |
2423 | ||
2424 | /* | |
2425 | * By the time this is called, we already have created | |
2426 | * the directory cache entry for the new file, but it | |
2427 | * is so far negative - it has no inode. | |
2428 | * | |
2429 | * If the create succeeds, we fill in the inode information | |
2430 | * with d_instantiate(). | |
2431 | */ | |
4acdaf27 | 2432 | static int ext4_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
ebfc3b49 | 2433 | bool excl) |
ac27a0ec DK |
2434 | { |
2435 | handle_t *handle; | |
af5bc92d | 2436 | struct inode *inode; |
1139575a | 2437 | int err, credits, retries = 0; |
ac27a0ec | 2438 | |
a7cdadee JK |
2439 | err = dquot_initialize(dir); |
2440 | if (err) | |
2441 | return err; | |
907f4554 | 2442 | |
1139575a | 2443 | credits = (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) + |
eb9cc7e1 | 2444 | EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3); |
ac27a0ec | 2445 | retry: |
1139575a TT |
2446 | inode = ext4_new_inode_start_handle(dir, mode, &dentry->d_name, 0, |
2447 | NULL, EXT4_HT_DIR, credits); | |
2448 | handle = ext4_journal_current_handle(); | |
ac27a0ec DK |
2449 | err = PTR_ERR(inode); |
2450 | if (!IS_ERR(inode)) { | |
617ba13b | 2451 | inode->i_op = &ext4_file_inode_operations; |
be64f884 | 2452 | inode->i_fop = &ext4_file_operations; |
617ba13b | 2453 | ext4_set_aops(inode); |
e709e9df | 2454 | err = ext4_add_nondir(handle, dentry, inode); |
1139575a TT |
2455 | if (!err && IS_DIRSYNC(dir)) |
2456 | ext4_handle_sync(handle); | |
ac27a0ec | 2457 | } |
1139575a TT |
2458 | if (handle) |
2459 | ext4_journal_stop(handle); | |
617ba13b | 2460 | if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries)) |
ac27a0ec DK |
2461 | goto retry; |
2462 | return err; | |
2463 | } | |
2464 | ||
af5bc92d | 2465 | static int ext4_mknod(struct inode *dir, struct dentry *dentry, |
1a67aafb | 2466 | umode_t mode, dev_t rdev) |
ac27a0ec DK |
2467 | { |
2468 | handle_t *handle; | |
2469 | struct inode *inode; | |
1139575a | 2470 | int err, credits, retries = 0; |
ac27a0ec | 2471 | |
a7cdadee JK |
2472 | err = dquot_initialize(dir); |
2473 | if (err) | |
2474 | return err; | |
907f4554 | 2475 | |
1139575a | 2476 | credits = (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) + |
eb9cc7e1 | 2477 | EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3); |
ac27a0ec | 2478 | retry: |
1139575a TT |
2479 | inode = ext4_new_inode_start_handle(dir, mode, &dentry->d_name, 0, |
2480 | NULL, EXT4_HT_DIR, credits); | |
2481 | handle = ext4_journal_current_handle(); | |
ac27a0ec DK |
2482 | err = PTR_ERR(inode); |
2483 | if (!IS_ERR(inode)) { | |
2484 | init_special_inode(inode, inode->i_mode, rdev); | |
617ba13b | 2485 | inode->i_op = &ext4_special_inode_operations; |
617ba13b | 2486 | err = ext4_add_nondir(handle, dentry, inode); |
1139575a TT |
2487 | if (!err && IS_DIRSYNC(dir)) |
2488 | ext4_handle_sync(handle); | |
ac27a0ec | 2489 | } |
1139575a TT |
2490 | if (handle) |
2491 | ext4_journal_stop(handle); | |
617ba13b | 2492 | if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries)) |
ac27a0ec DK |
2493 | goto retry; |
2494 | return err; | |
2495 | } | |
2496 | ||
af51a2ac AV |
2497 | static int ext4_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode) |
2498 | { | |
2499 | handle_t *handle; | |
2500 | struct inode *inode; | |
2501 | int err, retries = 0; | |
2502 | ||
a7cdadee JK |
2503 | err = dquot_initialize(dir); |
2504 | if (err) | |
2505 | return err; | |
af51a2ac AV |
2506 | |
2507 | retry: | |
2508 | inode = ext4_new_inode_start_handle(dir, mode, | |
2509 | NULL, 0, NULL, | |
2510 | EXT4_HT_DIR, | |
2511 | EXT4_MAXQUOTAS_INIT_BLOCKS(dir->i_sb) + | |
2512 | 4 + EXT4_XATTR_TRANS_BLOCKS); | |
2513 | handle = ext4_journal_current_handle(); | |
2514 | err = PTR_ERR(inode); | |
2515 | if (!IS_ERR(inode)) { | |
2516 | inode->i_op = &ext4_file_inode_operations; | |
be64f884 | 2517 | inode->i_fop = &ext4_file_operations; |
af51a2ac | 2518 | ext4_set_aops(inode); |
e94bd349 | 2519 | d_tmpfile(dentry, inode); |
af51a2ac AV |
2520 | err = ext4_orphan_add(handle, inode); |
2521 | if (err) | |
43ae9e3f | 2522 | goto err_unlock_inode; |
af51a2ac | 2523 | mark_inode_dirty(inode); |
af51a2ac AV |
2524 | unlock_new_inode(inode); |
2525 | } | |
2526 | if (handle) | |
2527 | ext4_journal_stop(handle); | |
2528 | if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries)) | |
2529 | goto retry; | |
2530 | return err; | |
43ae9e3f | 2531 | err_unlock_inode: |
af51a2ac AV |
2532 | ext4_journal_stop(handle); |
2533 | unlock_new_inode(inode); | |
af51a2ac AV |
2534 | return err; |
2535 | } | |
2536 | ||
a774f9c2 TM |
2537 | struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, |
2538 | struct ext4_dir_entry_2 *de, | |
2539 | int blocksize, int csum_size, | |
2540 | unsigned int parent_ino, int dotdot_real_len) | |
2541 | { | |
2542 | de->inode = cpu_to_le32(inode->i_ino); | |
2543 | de->name_len = 1; | |
2544 | de->rec_len = ext4_rec_len_to_disk(EXT4_DIR_REC_LEN(de->name_len), | |
2545 | blocksize); | |
2546 | strcpy(de->name, "."); | |
2547 | ext4_set_de_type(inode->i_sb, de, S_IFDIR); | |
2548 | ||
2549 | de = ext4_next_entry(de, blocksize); | |
2550 | de->inode = cpu_to_le32(parent_ino); | |
2551 | de->name_len = 2; | |
2552 | if (!dotdot_real_len) | |
2553 | de->rec_len = ext4_rec_len_to_disk(blocksize - | |
2554 | (csum_size + EXT4_DIR_REC_LEN(1)), | |
2555 | blocksize); | |
2556 | else | |
2557 | de->rec_len = ext4_rec_len_to_disk( | |
2558 | EXT4_DIR_REC_LEN(de->name_len), blocksize); | |
2559 | strcpy(de->name, ".."); | |
2560 | ext4_set_de_type(inode->i_sb, de, S_IFDIR); | |
2561 | ||
2562 | return ext4_next_entry(de, blocksize); | |
2563 | } | |
2564 | ||
2565 | static int ext4_init_new_dir(handle_t *handle, struct inode *dir, | |
2566 | struct inode *inode) | |
ac27a0ec | 2567 | { |
dabd991f | 2568 | struct buffer_head *dir_block = NULL; |
af5bc92d | 2569 | struct ext4_dir_entry_2 *de; |
b0336e8d | 2570 | struct ext4_dir_entry_tail *t; |
dc6982ff | 2571 | ext4_lblk_t block = 0; |
3d0518f4 | 2572 | unsigned int blocksize = dir->i_sb->s_blocksize; |
b0336e8d | 2573 | int csum_size = 0; |
a774f9c2 | 2574 | int err; |
ac27a0ec | 2575 | |
9aa5d32b | 2576 | if (ext4_has_metadata_csum(dir->i_sb)) |
b0336e8d DW |
2577 | csum_size = sizeof(struct ext4_dir_entry_tail); |
2578 | ||
3c47d541 TM |
2579 | if (ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) { |
2580 | err = ext4_try_create_inline_dir(handle, dir, inode); | |
2581 | if (err < 0 && err != -ENOSPC) | |
2582 | goto out; | |
2583 | if (!err) | |
2584 | goto out; | |
2585 | } | |
2586 | ||
dc6982ff | 2587 | inode->i_size = 0; |
0f70b406 TT |
2588 | dir_block = ext4_append(handle, inode, &block); |
2589 | if (IS_ERR(dir_block)) | |
2590 | return PTR_ERR(dir_block); | |
a774f9c2 TM |
2591 | de = (struct ext4_dir_entry_2 *)dir_block->b_data; |
2592 | ext4_init_dot_dotdot(inode, de, blocksize, csum_size, dir->i_ino, 0); | |
2593 | set_nlink(inode, 2); | |
2594 | if (csum_size) { | |
2595 | t = EXT4_DIRENT_TAIL(dir_block->b_data, blocksize); | |
2596 | initialize_dirent_tail(t, blocksize); | |
2597 | } | |
2598 | ||
2599 | BUFFER_TRACE(dir_block, "call ext4_handle_dirty_metadata"); | |
2600 | err = ext4_handle_dirty_dirent_node(handle, inode, dir_block); | |
2601 | if (err) | |
2602 | goto out; | |
2603 | set_buffer_verified(dir_block); | |
2604 | out: | |
2605 | brelse(dir_block); | |
2606 | return err; | |
2607 | } | |
2608 | ||
2609 | static int ext4_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) | |
2610 | { | |
2611 | handle_t *handle; | |
2612 | struct inode *inode; | |
1139575a | 2613 | int err, credits, retries = 0; |
a774f9c2 | 2614 | |
f8628a14 | 2615 | if (EXT4_DIR_LINK_MAX(dir)) |
ac27a0ec DK |
2616 | return -EMLINK; |
2617 | ||
a7cdadee JK |
2618 | err = dquot_initialize(dir); |
2619 | if (err) | |
2620 | return err; | |
907f4554 | 2621 | |
1139575a | 2622 | credits = (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) + |
eb9cc7e1 | 2623 | EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3); |
ac27a0ec | 2624 | retry: |
1139575a TT |
2625 | inode = ext4_new_inode_start_handle(dir, S_IFDIR | mode, |
2626 | &dentry->d_name, | |
2627 | 0, NULL, EXT4_HT_DIR, credits); | |
2628 | handle = ext4_journal_current_handle(); | |
ac27a0ec DK |
2629 | err = PTR_ERR(inode); |
2630 | if (IS_ERR(inode)) | |
2631 | goto out_stop; | |
2632 | ||
617ba13b MC |
2633 | inode->i_op = &ext4_dir_inode_operations; |
2634 | inode->i_fop = &ext4_dir_operations; | |
a774f9c2 | 2635 | err = ext4_init_new_dir(handle, dir, inode); |
dabd991f NK |
2636 | if (err) |
2637 | goto out_clear_inode; | |
2638 | err = ext4_mark_inode_dirty(handle, inode); | |
2639 | if (!err) | |
2640 | err = ext4_add_entry(handle, dentry, inode); | |
ac27a0ec | 2641 | if (err) { |
4cdeed86 AK |
2642 | out_clear_inode: |
2643 | clear_nlink(inode); | |
6b38e842 | 2644 | unlock_new_inode(inode); |
617ba13b | 2645 | ext4_mark_inode_dirty(handle, inode); |
af5bc92d | 2646 | iput(inode); |
ac27a0ec DK |
2647 | goto out_stop; |
2648 | } | |
f8628a14 | 2649 | ext4_inc_count(handle, dir); |
617ba13b | 2650 | ext4_update_dx_flag(dir); |
dabd991f NK |
2651 | err = ext4_mark_inode_dirty(handle, dir); |
2652 | if (err) | |
2653 | goto out_clear_inode; | |
6b38e842 | 2654 | unlock_new_inode(inode); |
8fc37ec5 | 2655 | d_instantiate(dentry, inode); |
1139575a TT |
2656 | if (IS_DIRSYNC(dir)) |
2657 | ext4_handle_sync(handle); | |
2658 | ||
ac27a0ec | 2659 | out_stop: |
1139575a TT |
2660 | if (handle) |
2661 | ext4_journal_stop(handle); | |
617ba13b | 2662 | if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries)) |
ac27a0ec DK |
2663 | goto retry; |
2664 | return err; | |
2665 | } | |
2666 | ||
2667 | /* | |
2668 | * routine to check that the specified directory is empty (for rmdir) | |
2669 | */ | |
a7550b30 | 2670 | bool ext4_empty_dir(struct inode *inode) |
ac27a0ec | 2671 | { |
498e5f24 | 2672 | unsigned int offset; |
af5bc92d TT |
2673 | struct buffer_head *bh; |
2674 | struct ext4_dir_entry_2 *de, *de1; | |
2675 | struct super_block *sb; | |
ac27a0ec | 2676 | |
61f86638 TM |
2677 | if (ext4_has_inline_data(inode)) { |
2678 | int has_inline_data = 1; | |
a7550b30 | 2679 | int ret; |
61f86638 | 2680 | |
a7550b30 | 2681 | ret = empty_inline_dir(inode, &has_inline_data); |
61f86638 | 2682 | if (has_inline_data) |
a7550b30 | 2683 | return ret; |
61f86638 TM |
2684 | } |
2685 | ||
ac27a0ec | 2686 | sb = inode->i_sb; |
dc6982ff TT |
2687 | if (inode->i_size < EXT4_DIR_REC_LEN(1) + EXT4_DIR_REC_LEN(2)) { |
2688 | EXT4_ERROR_INODE(inode, "invalid size"); | |
a7550b30 | 2689 | return true; |
ac27a0ec | 2690 | } |
dc6982ff TT |
2691 | bh = ext4_read_dirblock(inode, 0, EITHER); |
2692 | if (IS_ERR(bh)) | |
a7550b30 | 2693 | return true; |
dc6982ff | 2694 | |
617ba13b | 2695 | de = (struct ext4_dir_entry_2 *) bh->b_data; |
3d0518f4 | 2696 | de1 = ext4_next_entry(de, sb->s_blocksize); |
ac27a0ec | 2697 | if (le32_to_cpu(de->inode) != inode->i_ino || |
b03a2f7e AD |
2698 | le32_to_cpu(de1->inode) == 0 || |
2699 | strcmp(".", de->name) || strcmp("..", de1->name)) { | |
2700 | ext4_warning_inode(inode, "directory missing '.' and/or '..'"); | |
af5bc92d | 2701 | brelse(bh); |
a7550b30 | 2702 | return true; |
ac27a0ec | 2703 | } |
3d0518f4 WY |
2704 | offset = ext4_rec_len_from_disk(de->rec_len, sb->s_blocksize) + |
2705 | ext4_rec_len_from_disk(de1->rec_len, sb->s_blocksize); | |
2706 | de = ext4_next_entry(de1, sb->s_blocksize); | |
af5bc92d | 2707 | while (offset < inode->i_size) { |
236f5ecb | 2708 | if ((void *) de >= (void *) (bh->b_data+sb->s_blocksize)) { |
24676da4 | 2709 | unsigned int lblock; |
af5bc92d | 2710 | brelse(bh); |
24676da4 | 2711 | lblock = offset >> EXT4_BLOCK_SIZE_BITS(sb); |
dc6982ff TT |
2712 | bh = ext4_read_dirblock(inode, lblock, EITHER); |
2713 | if (IS_ERR(bh)) | |
a7550b30 | 2714 | return true; |
617ba13b | 2715 | de = (struct ext4_dir_entry_2 *) bh->b_data; |
ac27a0ec | 2716 | } |
226ba972 TM |
2717 | if (ext4_check_dir_entry(inode, NULL, de, bh, |
2718 | bh->b_data, bh->b_size, offset)) { | |
617ba13b | 2719 | de = (struct ext4_dir_entry_2 *)(bh->b_data + |
ac27a0ec DK |
2720 | sb->s_blocksize); |
2721 | offset = (offset | (sb->s_blocksize - 1)) + 1; | |
2722 | continue; | |
2723 | } | |
2724 | if (le32_to_cpu(de->inode)) { | |
af5bc92d | 2725 | brelse(bh); |
a7550b30 | 2726 | return false; |
ac27a0ec | 2727 | } |
3d0518f4 WY |
2728 | offset += ext4_rec_len_from_disk(de->rec_len, sb->s_blocksize); |
2729 | de = ext4_next_entry(de, sb->s_blocksize); | |
ac27a0ec | 2730 | } |
af5bc92d | 2731 | brelse(bh); |
a7550b30 | 2732 | return true; |
ac27a0ec DK |
2733 | } |
2734 | ||
d745a8c2 JK |
2735 | /* |
2736 | * ext4_orphan_add() links an unlinked or truncated inode into a list of | |
ac27a0ec DK |
2737 | * such inodes, starting at the superblock, in case we crash before the |
2738 | * file is closed/deleted, or in case the inode truncate spans multiple | |
2739 | * transactions and the last transaction is not recovered after a crash. | |
2740 | * | |
2741 | * At filesystem recovery time, we walk this list deleting unlinked | |
617ba13b | 2742 | * inodes and truncating linked inodes in ext4_orphan_cleanup(). |
d745a8c2 JK |
2743 | * |
2744 | * Orphan list manipulation functions must be called under i_mutex unless | |
2745 | * we are just creating the inode or deleting it. | |
ac27a0ec | 2746 | */ |
617ba13b | 2747 | int ext4_orphan_add(handle_t *handle, struct inode *inode) |
ac27a0ec DK |
2748 | { |
2749 | struct super_block *sb = inode->i_sb; | |
cd2c080c | 2750 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
617ba13b | 2751 | struct ext4_iloc iloc; |
ac27a0ec | 2752 | int err = 0, rc; |
d745a8c2 | 2753 | bool dirty = false; |
ac27a0ec | 2754 | |
e2bfb088 | 2755 | if (!sbi->s_journal || is_bad_inode(inode)) |
0390131b FM |
2756 | return 0; |
2757 | ||
d745a8c2 | 2758 | WARN_ON_ONCE(!(inode->i_state & (I_NEW | I_FREEING)) && |
5955102c | 2759 | !inode_is_locked(inode)); |
d745a8c2 JK |
2760 | /* |
2761 | * Exit early if inode already is on orphan list. This is a big speedup | |
2762 | * since we don't have to contend on the global s_orphan_lock. | |
2763 | */ | |
617ba13b | 2764 | if (!list_empty(&EXT4_I(inode)->i_orphan)) |
d745a8c2 | 2765 | return 0; |
ac27a0ec | 2766 | |
afb86178 LC |
2767 | /* |
2768 | * Orphan handling is only valid for files with data blocks | |
2769 | * being truncated, or files being unlinked. Note that we either | |
2770 | * hold i_mutex, or the inode can not be referenced from outside, | |
2771 | * so i_nlink should not be bumped due to race | |
ac27a0ec | 2772 | */ |
af5bc92d TT |
2773 | J_ASSERT((S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || |
2774 | S_ISLNK(inode->i_mode)) || inode->i_nlink == 0); | |
ac27a0ec | 2775 | |
cd2c080c JK |
2776 | BUFFER_TRACE(sbi->s_sbh, "get_write_access"); |
2777 | err = ext4_journal_get_write_access(handle, sbi->s_sbh); | |
ac27a0ec | 2778 | if (err) |
d745a8c2 | 2779 | goto out; |
ac27a0ec | 2780 | |
617ba13b | 2781 | err = ext4_reserve_inode_write(handle, inode, &iloc); |
ac27a0ec | 2782 | if (err) |
d745a8c2 JK |
2783 | goto out; |
2784 | ||
2785 | mutex_lock(&sbi->s_orphan_lock); | |
6e3617e5 DM |
2786 | /* |
2787 | * Due to previous errors inode may be already a part of on-disk | |
2788 | * orphan list. If so skip on-disk list modification. | |
2789 | */ | |
d745a8c2 JK |
2790 | if (!NEXT_ORPHAN(inode) || NEXT_ORPHAN(inode) > |
2791 | (le32_to_cpu(sbi->s_es->s_inodes_count))) { | |
2792 | /* Insert this inode at the head of the on-disk orphan list */ | |
2793 | NEXT_ORPHAN(inode) = le32_to_cpu(sbi->s_es->s_last_orphan); | |
2794 | sbi->s_es->s_last_orphan = cpu_to_le32(inode->i_ino); | |
2795 | dirty = true; | |
2796 | } | |
2797 | list_add(&EXT4_I(inode)->i_orphan, &sbi->s_orphan); | |
2798 | mutex_unlock(&sbi->s_orphan_lock); | |
ac27a0ec | 2799 | |
d745a8c2 JK |
2800 | if (dirty) { |
2801 | err = ext4_handle_dirty_super(handle, sb); | |
2802 | rc = ext4_mark_iloc_dirty(handle, inode, &iloc); | |
2803 | if (!err) | |
2804 | err = rc; | |
2805 | if (err) { | |
2806 | /* | |
2807 | * We have to remove inode from in-memory list if | |
2808 | * addition to on disk orphan list failed. Stray orphan | |
2809 | * list entries can cause panics at unmount time. | |
2810 | */ | |
2811 | mutex_lock(&sbi->s_orphan_lock); | |
74177f55 | 2812 | list_del_init(&EXT4_I(inode)->i_orphan); |
d745a8c2 JK |
2813 | mutex_unlock(&sbi->s_orphan_lock); |
2814 | } | |
2815 | } | |
ac27a0ec DK |
2816 | jbd_debug(4, "superblock will point to %lu\n", inode->i_ino); |
2817 | jbd_debug(4, "orphan inode %lu will point to %d\n", | |
2818 | inode->i_ino, NEXT_ORPHAN(inode)); | |
d745a8c2 | 2819 | out: |
cd2c080c | 2820 | ext4_std_error(sb, err); |
ac27a0ec DK |
2821 | return err; |
2822 | } | |
2823 | ||
2824 | /* | |
617ba13b | 2825 | * ext4_orphan_del() removes an unlinked or truncated inode from the list |
ac27a0ec DK |
2826 | * of such inodes stored on disk, because it is finally being cleaned up. |
2827 | */ | |
617ba13b | 2828 | int ext4_orphan_del(handle_t *handle, struct inode *inode) |
ac27a0ec DK |
2829 | { |
2830 | struct list_head *prev; | |
617ba13b | 2831 | struct ext4_inode_info *ei = EXT4_I(inode); |
cd2c080c | 2832 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
498e5f24 | 2833 | __u32 ino_next; |
617ba13b | 2834 | struct ext4_iloc iloc; |
ac27a0ec DK |
2835 | int err = 0; |
2836 | ||
cd2c080c | 2837 | if (!sbi->s_journal && !(sbi->s_mount_state & EXT4_ORPHAN_FS)) |
0390131b FM |
2838 | return 0; |
2839 | ||
d745a8c2 | 2840 | WARN_ON_ONCE(!(inode->i_state & (I_NEW | I_FREEING)) && |
5955102c | 2841 | !inode_is_locked(inode)); |
d745a8c2 | 2842 | /* Do this quick check before taking global s_orphan_lock. */ |
3b9d4ed2 | 2843 | if (list_empty(&ei->i_orphan)) |
d745a8c2 | 2844 | return 0; |
ac27a0ec | 2845 | |
d745a8c2 JK |
2846 | if (handle) { |
2847 | /* Grab inode buffer early before taking global s_orphan_lock */ | |
2848 | err = ext4_reserve_inode_write(handle, inode, &iloc); | |
2849 | } | |
ac27a0ec | 2850 | |
d745a8c2 | 2851 | mutex_lock(&sbi->s_orphan_lock); |
ac27a0ec DK |
2852 | jbd_debug(4, "remove inode %lu from orphan list\n", inode->i_ino); |
2853 | ||
d745a8c2 | 2854 | prev = ei->i_orphan.prev; |
ac27a0ec DK |
2855 | list_del_init(&ei->i_orphan); |
2856 | ||
2857 | /* If we're on an error path, we may not have a valid | |
2858 | * transaction handle with which to update the orphan list on | |
2859 | * disk, but we still need to remove the inode from the linked | |
2860 | * list in memory. */ | |
d745a8c2 JK |
2861 | if (!handle || err) { |
2862 | mutex_unlock(&sbi->s_orphan_lock); | |
ac27a0ec | 2863 | goto out_err; |
d745a8c2 | 2864 | } |
ac27a0ec | 2865 | |
d745a8c2 | 2866 | ino_next = NEXT_ORPHAN(inode); |
ac27a0ec | 2867 | if (prev == &sbi->s_orphan) { |
498e5f24 | 2868 | jbd_debug(4, "superblock will point to %u\n", ino_next); |
ac27a0ec | 2869 | BUFFER_TRACE(sbi->s_sbh, "get_write_access"); |
617ba13b | 2870 | err = ext4_journal_get_write_access(handle, sbi->s_sbh); |
d745a8c2 JK |
2871 | if (err) { |
2872 | mutex_unlock(&sbi->s_orphan_lock); | |
ac27a0ec | 2873 | goto out_brelse; |
d745a8c2 | 2874 | } |
ac27a0ec | 2875 | sbi->s_es->s_last_orphan = cpu_to_le32(ino_next); |
d745a8c2 | 2876 | mutex_unlock(&sbi->s_orphan_lock); |
b50924c2 | 2877 | err = ext4_handle_dirty_super(handle, inode->i_sb); |
ac27a0ec | 2878 | } else { |
617ba13b | 2879 | struct ext4_iloc iloc2; |
ac27a0ec | 2880 | struct inode *i_prev = |
617ba13b | 2881 | &list_entry(prev, struct ext4_inode_info, i_orphan)->vfs_inode; |
ac27a0ec | 2882 | |
498e5f24 | 2883 | jbd_debug(4, "orphan inode %lu will point to %u\n", |
ac27a0ec | 2884 | i_prev->i_ino, ino_next); |
617ba13b | 2885 | err = ext4_reserve_inode_write(handle, i_prev, &iloc2); |
d745a8c2 JK |
2886 | if (err) { |
2887 | mutex_unlock(&sbi->s_orphan_lock); | |
ac27a0ec | 2888 | goto out_brelse; |
d745a8c2 | 2889 | } |
ac27a0ec | 2890 | NEXT_ORPHAN(i_prev) = ino_next; |
617ba13b | 2891 | err = ext4_mark_iloc_dirty(handle, i_prev, &iloc2); |
d745a8c2 | 2892 | mutex_unlock(&sbi->s_orphan_lock); |
ac27a0ec DK |
2893 | } |
2894 | if (err) | |
2895 | goto out_brelse; | |
2896 | NEXT_ORPHAN(inode) = 0; | |
617ba13b | 2897 | err = ext4_mark_iloc_dirty(handle, inode, &iloc); |
ac27a0ec | 2898 | out_err: |
617ba13b | 2899 | ext4_std_error(inode->i_sb, err); |
ac27a0ec DK |
2900 | return err; |
2901 | ||
2902 | out_brelse: | |
2903 | brelse(iloc.bh); | |
2904 | goto out_err; | |
2905 | } | |
2906 | ||
af5bc92d | 2907 | static int ext4_rmdir(struct inode *dir, struct dentry *dentry) |
ac27a0ec DK |
2908 | { |
2909 | int retval; | |
af5bc92d TT |
2910 | struct inode *inode; |
2911 | struct buffer_head *bh; | |
2912 | struct ext4_dir_entry_2 *de; | |
8dcfaad2 | 2913 | handle_t *handle = NULL; |
ac27a0ec | 2914 | |
0db1ff22 TT |
2915 | if (unlikely(ext4_forced_shutdown(EXT4_SB(dir->i_sb)))) |
2916 | return -EIO; | |
2917 | ||
ac27a0ec DK |
2918 | /* Initialize quotas before so that eventual writes go in |
2919 | * separate transaction */ | |
a7cdadee JK |
2920 | retval = dquot_initialize(dir); |
2921 | if (retval) | |
2922 | return retval; | |
2923 | retval = dquot_initialize(d_inode(dentry)); | |
2924 | if (retval) | |
2925 | return retval; | |
907f4554 | 2926 | |
ac27a0ec | 2927 | retval = -ENOENT; |
32f7f22c | 2928 | bh = ext4_find_entry(dir, &dentry->d_name, &de, NULL); |
36de9286 TT |
2929 | if (IS_ERR(bh)) |
2930 | return PTR_ERR(bh); | |
ac27a0ec DK |
2931 | if (!bh) |
2932 | goto end_rmdir; | |
2933 | ||
2b0143b5 | 2934 | inode = d_inode(dentry); |
ac27a0ec | 2935 | |
6a797d27 | 2936 | retval = -EFSCORRUPTED; |
ac27a0ec DK |
2937 | if (le32_to_cpu(de->inode) != inode->i_ino) |
2938 | goto end_rmdir; | |
2939 | ||
2940 | retval = -ENOTEMPTY; | |
e875a2dd | 2941 | if (!ext4_empty_dir(inode)) |
ac27a0ec DK |
2942 | goto end_rmdir; |
2943 | ||
8dcfaad2 | 2944 | handle = ext4_journal_start(dir, EXT4_HT_DIR, |
64044abf | 2945 | EXT4_DATA_TRANS_BLOCKS(dir->i_sb)); |
8dcfaad2 TT |
2946 | if (IS_ERR(handle)) { |
2947 | retval = PTR_ERR(handle); | |
2948 | handle = NULL; | |
2949 | goto end_rmdir; | |
2950 | } | |
2951 | ||
2952 | if (IS_DIRSYNC(dir)) | |
2953 | ext4_handle_sync(handle); | |
2954 | ||
617ba13b | 2955 | retval = ext4_delete_entry(handle, dir, de, bh); |
ac27a0ec DK |
2956 | if (retval) |
2957 | goto end_rmdir; | |
f8628a14 | 2958 | if (!EXT4_DIR_LINK_EMPTY(inode)) |
b03a2f7e AD |
2959 | ext4_warning_inode(inode, |
2960 | "empty directory '%.*s' has too many links (%u)", | |
2961 | dentry->d_name.len, dentry->d_name.name, | |
af5bc92d | 2962 | inode->i_nlink); |
ee73f9a5 | 2963 | inode_inc_iversion(inode); |
ac27a0ec DK |
2964 | clear_nlink(inode); |
2965 | /* There's no need to set i_disksize: the fact that i_nlink is | |
2966 | * zero will ensure that the right thing happens during any | |
2967 | * recovery. */ | |
2968 | inode->i_size = 0; | |
617ba13b | 2969 | ext4_orphan_add(handle, inode); |
eeca7ea1 | 2970 | inode->i_ctime = dir->i_ctime = dir->i_mtime = current_time(inode); |
617ba13b | 2971 | ext4_mark_inode_dirty(handle, inode); |
f8628a14 | 2972 | ext4_dec_count(handle, dir); |
617ba13b MC |
2973 | ext4_update_dx_flag(dir); |
2974 | ext4_mark_inode_dirty(handle, dir); | |
ac27a0ec DK |
2975 | |
2976 | end_rmdir: | |
af5bc92d | 2977 | brelse(bh); |
8dcfaad2 TT |
2978 | if (handle) |
2979 | ext4_journal_stop(handle); | |
ac27a0ec DK |
2980 | return retval; |
2981 | } | |
2982 | ||
af5bc92d | 2983 | static int ext4_unlink(struct inode *dir, struct dentry *dentry) |
ac27a0ec DK |
2984 | { |
2985 | int retval; | |
af5bc92d TT |
2986 | struct inode *inode; |
2987 | struct buffer_head *bh; | |
2988 | struct ext4_dir_entry_2 *de; | |
931b6864 | 2989 | handle_t *handle = NULL; |
ac27a0ec | 2990 | |
0db1ff22 TT |
2991 | if (unlikely(ext4_forced_shutdown(EXT4_SB(dir->i_sb)))) |
2992 | return -EIO; | |
2993 | ||
0562e0ba | 2994 | trace_ext4_unlink_enter(dir, dentry); |
ac27a0ec DK |
2995 | /* Initialize quotas before so that eventual writes go |
2996 | * in separate transaction */ | |
a7cdadee JK |
2997 | retval = dquot_initialize(dir); |
2998 | if (retval) | |
2999 | return retval; | |
3000 | retval = dquot_initialize(d_inode(dentry)); | |
3001 | if (retval) | |
3002 | return retval; | |
907f4554 | 3003 | |
ac27a0ec | 3004 | retval = -ENOENT; |
32f7f22c | 3005 | bh = ext4_find_entry(dir, &dentry->d_name, &de, NULL); |
36de9286 TT |
3006 | if (IS_ERR(bh)) |
3007 | return PTR_ERR(bh); | |
ac27a0ec DK |
3008 | if (!bh) |
3009 | goto end_unlink; | |
3010 | ||
2b0143b5 | 3011 | inode = d_inode(dentry); |
ac27a0ec | 3012 | |
6a797d27 | 3013 | retval = -EFSCORRUPTED; |
ac27a0ec DK |
3014 | if (le32_to_cpu(de->inode) != inode->i_ino) |
3015 | goto end_unlink; | |
3016 | ||
931b6864 | 3017 | handle = ext4_journal_start(dir, EXT4_HT_DIR, |
64044abf | 3018 | EXT4_DATA_TRANS_BLOCKS(dir->i_sb)); |
931b6864 TT |
3019 | if (IS_ERR(handle)) { |
3020 | retval = PTR_ERR(handle); | |
3021 | handle = NULL; | |
3022 | goto end_unlink; | |
3023 | } | |
3024 | ||
3025 | if (IS_DIRSYNC(dir)) | |
3026 | ext4_handle_sync(handle); | |
3027 | ||
b03a2f7e AD |
3028 | if (inode->i_nlink == 0) { |
3029 | ext4_warning_inode(inode, "Deleting file '%.*s' with no links", | |
3030 | dentry->d_name.len, dentry->d_name.name); | |
bfe86848 | 3031 | set_nlink(inode, 1); |
ac27a0ec | 3032 | } |
617ba13b | 3033 | retval = ext4_delete_entry(handle, dir, de, bh); |
ac27a0ec DK |
3034 | if (retval) |
3035 | goto end_unlink; | |
eeca7ea1 | 3036 | dir->i_ctime = dir->i_mtime = current_time(dir); |
617ba13b MC |
3037 | ext4_update_dx_flag(dir); |
3038 | ext4_mark_inode_dirty(handle, dir); | |
825f1481 | 3039 | drop_nlink(inode); |
ac27a0ec | 3040 | if (!inode->i_nlink) |
617ba13b | 3041 | ext4_orphan_add(handle, inode); |
eeca7ea1 | 3042 | inode->i_ctime = current_time(inode); |
617ba13b | 3043 | ext4_mark_inode_dirty(handle, inode); |
ac27a0ec DK |
3044 | |
3045 | end_unlink: | |
af5bc92d | 3046 | brelse(bh); |
931b6864 TT |
3047 | if (handle) |
3048 | ext4_journal_stop(handle); | |
0562e0ba | 3049 | trace_ext4_unlink_exit(dentry, retval); |
ac27a0ec DK |
3050 | return retval; |
3051 | } | |
3052 | ||
af5bc92d TT |
3053 | static int ext4_symlink(struct inode *dir, |
3054 | struct dentry *dentry, const char *symname) | |
ac27a0ec DK |
3055 | { |
3056 | handle_t *handle; | |
af5bc92d | 3057 | struct inode *inode; |
f348c252 | 3058 | int err, len = strlen(symname); |
df5e6223 | 3059 | int credits; |
a7550b30 | 3060 | struct fscrypt_str disk_link; |
ac27a0ec | 3061 | |
0db1ff22 TT |
3062 | if (unlikely(ext4_forced_shutdown(EXT4_SB(dir->i_sb)))) |
3063 | return -EIO; | |
3064 | ||
78e1060c EB |
3065 | err = fscrypt_prepare_symlink(dir, symname, len, dir->i_sb->s_blocksize, |
3066 | &disk_link); | |
3067 | if (err) | |
3068 | return err; | |
ac27a0ec | 3069 | |
a7cdadee JK |
3070 | err = dquot_initialize(dir); |
3071 | if (err) | |
78e1060c | 3072 | return err; |
907f4554 | 3073 | |
f348c252 | 3074 | if ((disk_link.len > EXT4_N_BLOCKS * 4)) { |
df5e6223 JK |
3075 | /* |
3076 | * For non-fast symlinks, we just allocate inode and put it on | |
3077 | * orphan list in the first transaction => we need bitmap, | |
8c208719 ES |
3078 | * group descriptor, sb, inode block, quota blocks, and |
3079 | * possibly selinux xattr blocks. | |
df5e6223 | 3080 | */ |
8c208719 ES |
3081 | credits = 4 + EXT4_MAXQUOTAS_INIT_BLOCKS(dir->i_sb) + |
3082 | EXT4_XATTR_TRANS_BLOCKS; | |
df5e6223 JK |
3083 | } else { |
3084 | /* | |
3085 | * Fast symlink. We have to add entry to directory | |
3086 | * (EXT4_DATA_TRANS_BLOCKS + EXT4_INDEX_EXTRA_TRANS_BLOCKS), | |
3087 | * allocate new inode (bitmap, group descriptor, inode block, | |
3088 | * quota blocks, sb is already counted in previous macros). | |
3089 | */ | |
3090 | credits = EXT4_DATA_TRANS_BLOCKS(dir->i_sb) + | |
eb9cc7e1 | 3091 | EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3; |
df5e6223 | 3092 | } |
f348c252 | 3093 | |
1139575a TT |
3094 | inode = ext4_new_inode_start_handle(dir, S_IFLNK|S_IRWXUGO, |
3095 | &dentry->d_name, 0, NULL, | |
3096 | EXT4_HT_DIR, credits); | |
3097 | handle = ext4_journal_current_handle(); | |
f348c252 TT |
3098 | if (IS_ERR(inode)) { |
3099 | if (handle) | |
3100 | ext4_journal_stop(handle); | |
78e1060c | 3101 | return PTR_ERR(inode); |
f348c252 TT |
3102 | } |
3103 | ||
78e1060c EB |
3104 | if (IS_ENCRYPTED(inode)) { |
3105 | err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link); | |
ef1eb3aa | 3106 | if (err) |
f348c252 | 3107 | goto err_drop_inode; |
a7a67e8a | 3108 | inode->i_op = &ext4_encrypted_symlink_inode_operations; |
f348c252 | 3109 | } |
ac27a0ec | 3110 | |
f348c252 | 3111 | if ((disk_link.len > EXT4_N_BLOCKS * 4)) { |
78e1060c | 3112 | if (!IS_ENCRYPTED(inode)) |
a7a67e8a | 3113 | inode->i_op = &ext4_symlink_inode_operations; |
21fc61c7 | 3114 | inode_nohighmem(inode); |
617ba13b | 3115 | ext4_set_aops(inode); |
ac27a0ec | 3116 | /* |
df5e6223 JK |
3117 | * We cannot call page_symlink() with transaction started |
3118 | * because it calls into ext4_write_begin() which can wait | |
3119 | * for transaction commit if we are running out of space | |
3120 | * and thus we deadlock. So we have to stop transaction now | |
3121 | * and restart it when symlink contents is written. | |
3122 | * | |
3123 | * To keep fs consistent in case of crash, we have to put inode | |
3124 | * to orphan list in the mean time. | |
ac27a0ec | 3125 | */ |
df5e6223 JK |
3126 | drop_nlink(inode); |
3127 | err = ext4_orphan_add(handle, inode); | |
3128 | ext4_journal_stop(handle); | |
f348c252 | 3129 | handle = NULL; |
df5e6223 JK |
3130 | if (err) |
3131 | goto err_drop_inode; | |
f348c252 | 3132 | err = __page_symlink(inode, disk_link.name, disk_link.len, 1); |
df5e6223 JK |
3133 | if (err) |
3134 | goto err_drop_inode; | |
3135 | /* | |
3136 | * Now inode is being linked into dir (EXT4_DATA_TRANS_BLOCKS | |
3137 | * + EXT4_INDEX_EXTRA_TRANS_BLOCKS), inode is also modified | |
3138 | */ | |
9924a92a | 3139 | handle = ext4_journal_start(dir, EXT4_HT_DIR, |
df5e6223 JK |
3140 | EXT4_DATA_TRANS_BLOCKS(dir->i_sb) + |
3141 | EXT4_INDEX_EXTRA_TRANS_BLOCKS + 1); | |
3142 | if (IS_ERR(handle)) { | |
3143 | err = PTR_ERR(handle); | |
f348c252 | 3144 | handle = NULL; |
df5e6223 JK |
3145 | goto err_drop_inode; |
3146 | } | |
0ce8c010 | 3147 | set_nlink(inode, 1); |
df5e6223 | 3148 | err = ext4_orphan_del(handle, inode); |
f348c252 | 3149 | if (err) |
df5e6223 | 3150 | goto err_drop_inode; |
ac27a0ec | 3151 | } else { |
e65187e6 | 3152 | /* clear the extent format for fast symlink */ |
12e9b892 | 3153 | ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS); |
78e1060c | 3154 | if (!IS_ENCRYPTED(inode)) { |
a7a67e8a | 3155 | inode->i_op = &ext4_fast_symlink_inode_operations; |
75e7566b AV |
3156 | inode->i_link = (char *)&EXT4_I(inode)->i_data; |
3157 | } | |
f348c252 TT |
3158 | memcpy((char *)&EXT4_I(inode)->i_data, disk_link.name, |
3159 | disk_link.len); | |
3160 | inode->i_size = disk_link.len - 1; | |
ac27a0ec | 3161 | } |
617ba13b MC |
3162 | EXT4_I(inode)->i_disksize = inode->i_size; |
3163 | err = ext4_add_nondir(handle, dentry, inode); | |
1139575a TT |
3164 | if (!err && IS_DIRSYNC(dir)) |
3165 | ext4_handle_sync(handle); | |
3166 | ||
1139575a TT |
3167 | if (handle) |
3168 | ext4_journal_stop(handle); | |
78e1060c EB |
3169 | goto out_free_encrypted_link; |
3170 | ||
df5e6223 | 3171 | err_drop_inode: |
f348c252 TT |
3172 | if (handle) |
3173 | ext4_journal_stop(handle); | |
f348c252 | 3174 | clear_nlink(inode); |
df5e6223 JK |
3175 | unlock_new_inode(inode); |
3176 | iput(inode); | |
78e1060c EB |
3177 | out_free_encrypted_link: |
3178 | if (disk_link.name != (unsigned char *)symname) | |
3179 | kfree(disk_link.name); | |
df5e6223 | 3180 | return err; |
ac27a0ec DK |
3181 | } |
3182 | ||
af5bc92d TT |
3183 | static int ext4_link(struct dentry *old_dentry, |
3184 | struct inode *dir, struct dentry *dentry) | |
ac27a0ec DK |
3185 | { |
3186 | handle_t *handle; | |
2b0143b5 | 3187 | struct inode *inode = d_inode(old_dentry); |
ac27a0ec DK |
3188 | int err, retries = 0; |
3189 | ||
b05ab1dc | 3190 | if (inode->i_nlink >= EXT4_LINK_MAX) |
ac27a0ec | 3191 | return -EMLINK; |
69725181 EB |
3192 | |
3193 | err = fscrypt_prepare_link(old_dentry, dir, dentry); | |
3194 | if (err) | |
3195 | return err; | |
040cb378 | 3196 | |
a794df0e CIK |
3197 | if ((ext4_test_inode_flag(dir, EXT4_INODE_PROJINHERIT)) && |
3198 | (!projid_eq(EXT4_I(dir)->i_projid, | |
3199 | EXT4_I(old_dentry->d_inode)->i_projid))) | |
040cb378 LX |
3200 | return -EXDEV; |
3201 | ||
a7cdadee JK |
3202 | err = dquot_initialize(dir); |
3203 | if (err) | |
3204 | return err; | |
907f4554 | 3205 | |
ac27a0ec | 3206 | retry: |
9924a92a TT |
3207 | handle = ext4_journal_start(dir, EXT4_HT_DIR, |
3208 | (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) + | |
af51a2ac | 3209 | EXT4_INDEX_EXTRA_TRANS_BLOCKS) + 1); |
ac27a0ec DK |
3210 | if (IS_ERR(handle)) |
3211 | return PTR_ERR(handle); | |
3212 | ||
3213 | if (IS_DIRSYNC(dir)) | |
0390131b | 3214 | ext4_handle_sync(handle); |
ac27a0ec | 3215 | |
eeca7ea1 | 3216 | inode->i_ctime = current_time(inode); |
f8628a14 | 3217 | ext4_inc_count(handle, inode); |
7de9c6ee | 3218 | ihold(inode); |
ac27a0ec | 3219 | |
6b38e842 AV |
3220 | err = ext4_add_entry(handle, dentry, inode); |
3221 | if (!err) { | |
3222 | ext4_mark_inode_dirty(handle, inode); | |
af51a2ac AV |
3223 | /* this can happen only for tmpfile being |
3224 | * linked the first time | |
3225 | */ | |
3226 | if (inode->i_nlink == 1) | |
3227 | ext4_orphan_del(handle, inode); | |
6b38e842 AV |
3228 | d_instantiate(dentry, inode); |
3229 | } else { | |
3230 | drop_nlink(inode); | |
3231 | iput(inode); | |
3232 | } | |
617ba13b MC |
3233 | ext4_journal_stop(handle); |
3234 | if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries)) | |
ac27a0ec DK |
3235 | goto retry; |
3236 | return err; | |
3237 | } | |
3238 | ||
32f7f22c TM |
3239 | |
3240 | /* | |
3241 | * Try to find buffer head where contains the parent block. | |
3242 | * It should be the inode block if it is inlined or the 1st block | |
3243 | * if it is a normal dir. | |
3244 | */ | |
3245 | static struct buffer_head *ext4_get_first_dir_block(handle_t *handle, | |
3246 | struct inode *inode, | |
3247 | int *retval, | |
3248 | struct ext4_dir_entry_2 **parent_de, | |
3249 | int *inlined) | |
3250 | { | |
3251 | struct buffer_head *bh; | |
3252 | ||
3253 | if (!ext4_has_inline_data(inode)) { | |
dc6982ff TT |
3254 | bh = ext4_read_dirblock(inode, 0, EITHER); |
3255 | if (IS_ERR(bh)) { | |
3256 | *retval = PTR_ERR(bh); | |
32f7f22c TM |
3257 | return NULL; |
3258 | } | |
3259 | *parent_de = ext4_next_entry( | |
3260 | (struct ext4_dir_entry_2 *)bh->b_data, | |
3261 | inode->i_sb->s_blocksize); | |
3262 | return bh; | |
3263 | } | |
3264 | ||
3265 | *inlined = 1; | |
3266 | return ext4_get_first_inline_block(inode, parent_de, retval); | |
3267 | } | |
ac27a0ec | 3268 | |
c0d268c3 MS |
3269 | struct ext4_renament { |
3270 | struct inode *dir; | |
3271 | struct dentry *dentry; | |
3272 | struct inode *inode; | |
bd42998a MS |
3273 | bool is_dir; |
3274 | int dir_nlink_delta; | |
c0d268c3 MS |
3275 | |
3276 | /* entry for "dentry" */ | |
3277 | struct buffer_head *bh; | |
3278 | struct ext4_dir_entry_2 *de; | |
3279 | int inlined; | |
3280 | ||
3281 | /* entry for ".." in inode if it's a directory */ | |
3282 | struct buffer_head *dir_bh; | |
3283 | struct ext4_dir_entry_2 *parent_de; | |
3284 | int dir_inlined; | |
3285 | }; | |
3286 | ||
bd1af145 MS |
3287 | static int ext4_rename_dir_prepare(handle_t *handle, struct ext4_renament *ent) |
3288 | { | |
3289 | int retval; | |
3290 | ||
3291 | ent->dir_bh = ext4_get_first_dir_block(handle, ent->inode, | |
3292 | &retval, &ent->parent_de, | |
3293 | &ent->dir_inlined); | |
3294 | if (!ent->dir_bh) | |
3295 | return retval; | |
3296 | if (le32_to_cpu(ent->parent_de->inode) != ent->dir->i_ino) | |
6a797d27 | 3297 | return -EFSCORRUPTED; |
bd1af145 MS |
3298 | BUFFER_TRACE(ent->dir_bh, "get_write_access"); |
3299 | return ext4_journal_get_write_access(handle, ent->dir_bh); | |
3300 | } | |
3301 | ||
3302 | static int ext4_rename_dir_finish(handle_t *handle, struct ext4_renament *ent, | |
3303 | unsigned dir_ino) | |
3304 | { | |
3305 | int retval; | |
3306 | ||
3307 | ent->parent_de->inode = cpu_to_le32(dir_ino); | |
3308 | BUFFER_TRACE(ent->dir_bh, "call ext4_handle_dirty_metadata"); | |
3309 | if (!ent->dir_inlined) { | |
3310 | if (is_dx(ent->inode)) { | |
3311 | retval = ext4_handle_dirty_dx_node(handle, | |
3312 | ent->inode, | |
3313 | ent->dir_bh); | |
3314 | } else { | |
3315 | retval = ext4_handle_dirty_dirent_node(handle, | |
3316 | ent->inode, | |
3317 | ent->dir_bh); | |
3318 | } | |
3319 | } else { | |
3320 | retval = ext4_mark_inode_dirty(handle, ent->inode); | |
3321 | } | |
3322 | if (retval) { | |
3323 | ext4_std_error(ent->dir->i_sb, retval); | |
3324 | return retval; | |
3325 | } | |
3326 | return 0; | |
3327 | } | |
3328 | ||
3329 | static int ext4_setent(handle_t *handle, struct ext4_renament *ent, | |
3330 | unsigned ino, unsigned file_type) | |
3331 | { | |
3332 | int retval; | |
3333 | ||
3334 | BUFFER_TRACE(ent->bh, "get write access"); | |
3335 | retval = ext4_journal_get_write_access(handle, ent->bh); | |
3336 | if (retval) | |
3337 | return retval; | |
3338 | ent->de->inode = cpu_to_le32(ino); | |
e2b911c5 | 3339 | if (ext4_has_feature_filetype(ent->dir->i_sb)) |
bd1af145 | 3340 | ent->de->file_type = file_type; |
ee73f9a5 | 3341 | inode_inc_iversion(ent->dir); |
bd1af145 | 3342 | ent->dir->i_ctime = ent->dir->i_mtime = |
eeca7ea1 | 3343 | current_time(ent->dir); |
bd1af145 MS |
3344 | ext4_mark_inode_dirty(handle, ent->dir); |
3345 | BUFFER_TRACE(ent->bh, "call ext4_handle_dirty_metadata"); | |
3346 | if (!ent->inlined) { | |
3347 | retval = ext4_handle_dirty_dirent_node(handle, | |
3348 | ent->dir, ent->bh); | |
3349 | if (unlikely(retval)) { | |
3350 | ext4_std_error(ent->dir->i_sb, retval); | |
3351 | return retval; | |
3352 | } | |
3353 | } | |
3354 | brelse(ent->bh); | |
3355 | ent->bh = NULL; | |
3356 | ||
3357 | return 0; | |
3358 | } | |
3359 | ||
3360 | static int ext4_find_delete_entry(handle_t *handle, struct inode *dir, | |
3361 | const struct qstr *d_name) | |
3362 | { | |
3363 | int retval = -ENOENT; | |
3364 | struct buffer_head *bh; | |
3365 | struct ext4_dir_entry_2 *de; | |
3366 | ||
3367 | bh = ext4_find_entry(dir, d_name, &de, NULL); | |
36de9286 TT |
3368 | if (IS_ERR(bh)) |
3369 | return PTR_ERR(bh); | |
bd1af145 MS |
3370 | if (bh) { |
3371 | retval = ext4_delete_entry(handle, dir, de, bh); | |
3372 | brelse(bh); | |
3373 | } | |
3374 | return retval; | |
3375 | } | |
3376 | ||
d80d448c DW |
3377 | static void ext4_rename_delete(handle_t *handle, struct ext4_renament *ent, |
3378 | int force_reread) | |
bd1af145 MS |
3379 | { |
3380 | int retval; | |
3381 | /* | |
3382 | * ent->de could have moved from under us during htree split, so make | |
3383 | * sure that we are deleting the right entry. We might also be pointing | |
3384 | * to a stale entry in the unused part of ent->bh so just checking inum | |
3385 | * and the name isn't enough. | |
3386 | */ | |
3387 | if (le32_to_cpu(ent->de->inode) != ent->inode->i_ino || | |
3388 | ent->de->name_len != ent->dentry->d_name.len || | |
3389 | strncmp(ent->de->name, ent->dentry->d_name.name, | |
d80d448c DW |
3390 | ent->de->name_len) || |
3391 | force_reread) { | |
bd1af145 MS |
3392 | retval = ext4_find_delete_entry(handle, ent->dir, |
3393 | &ent->dentry->d_name); | |
3394 | } else { | |
3395 | retval = ext4_delete_entry(handle, ent->dir, ent->de, ent->bh); | |
3396 | if (retval == -ENOENT) { | |
3397 | retval = ext4_find_delete_entry(handle, ent->dir, | |
3398 | &ent->dentry->d_name); | |
3399 | } | |
3400 | } | |
3401 | ||
3402 | if (retval) { | |
b03a2f7e AD |
3403 | ext4_warning_inode(ent->dir, |
3404 | "Deleting old file: nlink %d, error=%d", | |
3405 | ent->dir->i_nlink, retval); | |
bd1af145 MS |
3406 | } |
3407 | } | |
3408 | ||
bd42998a MS |
3409 | static void ext4_update_dir_count(handle_t *handle, struct ext4_renament *ent) |
3410 | { | |
3411 | if (ent->dir_nlink_delta) { | |
3412 | if (ent->dir_nlink_delta == -1) | |
3413 | ext4_dec_count(handle, ent->dir); | |
3414 | else | |
3415 | ext4_inc_count(handle, ent->dir); | |
3416 | ext4_mark_inode_dirty(handle, ent->dir); | |
3417 | } | |
3418 | } | |
3419 | ||
cd808dec MS |
3420 | static struct inode *ext4_whiteout_for_rename(struct ext4_renament *ent, |
3421 | int credits, handle_t **h) | |
3422 | { | |
3423 | struct inode *wh; | |
3424 | handle_t *handle; | |
3425 | int retries = 0; | |
3426 | ||
3427 | /* | |
3428 | * for inode block, sb block, group summaries, | |
3429 | * and inode bitmap | |
3430 | */ | |
3431 | credits += (EXT4_MAXQUOTAS_TRANS_BLOCKS(ent->dir->i_sb) + | |
3432 | EXT4_XATTR_TRANS_BLOCKS + 4); | |
3433 | retry: | |
3434 | wh = ext4_new_inode_start_handle(ent->dir, S_IFCHR | WHITEOUT_MODE, | |
3435 | &ent->dentry->d_name, 0, NULL, | |
3436 | EXT4_HT_DIR, credits); | |
3437 | ||
3438 | handle = ext4_journal_current_handle(); | |
3439 | if (IS_ERR(wh)) { | |
3440 | if (handle) | |
3441 | ext4_journal_stop(handle); | |
3442 | if (PTR_ERR(wh) == -ENOSPC && | |
3443 | ext4_should_retry_alloc(ent->dir->i_sb, &retries)) | |
3444 | goto retry; | |
3445 | } else { | |
3446 | *h = handle; | |
3447 | init_special_inode(wh, wh->i_mode, WHITEOUT_DEV); | |
3448 | wh->i_op = &ext4_special_inode_operations; | |
3449 | } | |
3450 | return wh; | |
3451 | } | |
3452 | ||
ac27a0ec DK |
3453 | /* |
3454 | * Anybody can rename anything with this: the permission checks are left to the | |
3455 | * higher-level routines. | |
0e202704 TT |
3456 | * |
3457 | * n.b. old_{dentry,inode) refers to the source dentry/inode | |
3458 | * while new_{dentry,inode) refers to the destination dentry/inode | |
3459 | * This comes from rename(const char *oldpath, const char *newpath) | |
ac27a0ec | 3460 | */ |
af5bc92d | 3461 | static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry, |
cd808dec MS |
3462 | struct inode *new_dir, struct dentry *new_dentry, |
3463 | unsigned int flags) | |
ac27a0ec | 3464 | { |
5b61de75 | 3465 | handle_t *handle = NULL; |
c0d268c3 MS |
3466 | struct ext4_renament old = { |
3467 | .dir = old_dir, | |
3468 | .dentry = old_dentry, | |
2b0143b5 | 3469 | .inode = d_inode(old_dentry), |
c0d268c3 MS |
3470 | }; |
3471 | struct ext4_renament new = { | |
3472 | .dir = new_dir, | |
3473 | .dentry = new_dentry, | |
2b0143b5 | 3474 | .inode = d_inode(new_dentry), |
c0d268c3 | 3475 | }; |
d80d448c | 3476 | int force_reread; |
0e202704 | 3477 | int retval; |
cd808dec MS |
3478 | struct inode *whiteout = NULL; |
3479 | int credits; | |
3480 | u8 old_file_type; | |
907f4554 | 3481 | |
040cb378 LX |
3482 | if ((ext4_test_inode_flag(new_dir, EXT4_INODE_PROJINHERIT)) && |
3483 | (!projid_eq(EXT4_I(new_dir)->i_projid, | |
3484 | EXT4_I(old_dentry->d_inode)->i_projid))) | |
3485 | return -EXDEV; | |
3486 | ||
a7cdadee JK |
3487 | retval = dquot_initialize(old.dir); |
3488 | if (retval) | |
3489 | return retval; | |
3490 | retval = dquot_initialize(new.dir); | |
3491 | if (retval) | |
3492 | return retval; | |
ac27a0ec DK |
3493 | |
3494 | /* Initialize quotas before so that eventual writes go | |
3495 | * in separate transaction */ | |
a7cdadee JK |
3496 | if (new.inode) { |
3497 | retval = dquot_initialize(new.inode); | |
3498 | if (retval) | |
3499 | return retval; | |
3500 | } | |
ac27a0ec | 3501 | |
c0d268c3 | 3502 | old.bh = ext4_find_entry(old.dir, &old.dentry->d_name, &old.de, NULL); |
36de9286 TT |
3503 | if (IS_ERR(old.bh)) |
3504 | return PTR_ERR(old.bh); | |
ac27a0ec DK |
3505 | /* |
3506 | * Check for inode number is _not_ due to possible IO errors. | |
3507 | * We might rmdir the source, keep it as pwd of some process | |
3508 | * and merrily kill the link to whatever was created under the | |
3509 | * same name. Goodbye sticky bit ;-< | |
3510 | */ | |
ac27a0ec | 3511 | retval = -ENOENT; |
c0d268c3 | 3512 | if (!old.bh || le32_to_cpu(old.de->inode) != old.inode->i_ino) |
ac27a0ec DK |
3513 | goto end_rename; |
3514 | ||
c0d268c3 MS |
3515 | new.bh = ext4_find_entry(new.dir, &new.dentry->d_name, |
3516 | &new.de, &new.inlined); | |
36de9286 TT |
3517 | if (IS_ERR(new.bh)) { |
3518 | retval = PTR_ERR(new.bh); | |
a9cfcd63 | 3519 | new.bh = NULL; |
36de9286 TT |
3520 | goto end_rename; |
3521 | } | |
c0d268c3 MS |
3522 | if (new.bh) { |
3523 | if (!new.inode) { | |
3524 | brelse(new.bh); | |
3525 | new.bh = NULL; | |
ac27a0ec DK |
3526 | } |
3527 | } | |
c0d268c3 MS |
3528 | if (new.inode && !test_opt(new.dir->i_sb, NO_AUTO_DA_ALLOC)) |
3529 | ext4_alloc_da_blocks(old.inode); | |
5b61de75 | 3530 | |
cd808dec MS |
3531 | credits = (2 * EXT4_DATA_TRANS_BLOCKS(old.dir->i_sb) + |
3532 | EXT4_INDEX_EXTRA_TRANS_BLOCKS + 2); | |
3533 | if (!(flags & RENAME_WHITEOUT)) { | |
3534 | handle = ext4_journal_start(old.dir, EXT4_HT_DIR, credits); | |
7071b715 KK |
3535 | if (IS_ERR(handle)) { |
3536 | retval = PTR_ERR(handle); | |
3537 | handle = NULL; | |
3538 | goto end_rename; | |
3539 | } | |
cd808dec MS |
3540 | } else { |
3541 | whiteout = ext4_whiteout_for_rename(&old, credits, &handle); | |
7071b715 KK |
3542 | if (IS_ERR(whiteout)) { |
3543 | retval = PTR_ERR(whiteout); | |
3544 | whiteout = NULL; | |
3545 | goto end_rename; | |
3546 | } | |
cd808dec | 3547 | } |
5b61de75 | 3548 | |
c0d268c3 | 3549 | if (IS_DIRSYNC(old.dir) || IS_DIRSYNC(new.dir)) |
5b61de75 TT |
3550 | ext4_handle_sync(handle); |
3551 | ||
c0d268c3 MS |
3552 | if (S_ISDIR(old.inode->i_mode)) { |
3553 | if (new.inode) { | |
ac27a0ec | 3554 | retval = -ENOTEMPTY; |
e875a2dd | 3555 | if (!ext4_empty_dir(new.inode)) |
ac27a0ec | 3556 | goto end_rename; |
0d7d5d67 MS |
3557 | } else { |
3558 | retval = -EMLINK; | |
3559 | if (new.dir != old.dir && EXT4_DIR_LINK_MAX(new.dir)) | |
3560 | goto end_rename; | |
ac27a0ec | 3561 | } |
bd1af145 | 3562 | retval = ext4_rename_dir_prepare(handle, &old); |
ef607893 AG |
3563 | if (retval) |
3564 | goto end_rename; | |
ac27a0ec | 3565 | } |
d80d448c DW |
3566 | /* |
3567 | * If we're renaming a file within an inline_data dir and adding or | |
3568 | * setting the new dirent causes a conversion from inline_data to | |
3569 | * extents/blockmap, we need to force the dirent delete code to | |
3570 | * re-read the directory, or else we end up trying to delete a dirent | |
3571 | * from what is now the extent tree root (or a block map). | |
3572 | */ | |
3573 | force_reread = (new.dir->i_ino == old.dir->i_ino && | |
3574 | ext4_test_inode_flag(new.dir, EXT4_INODE_INLINE_DATA)); | |
cd808dec MS |
3575 | |
3576 | old_file_type = old.de->file_type; | |
3577 | if (whiteout) { | |
3578 | /* | |
3579 | * Do this before adding a new entry, so the old entry is sure | |
3580 | * to be still pointing to the valid old entry. | |
3581 | */ | |
3582 | retval = ext4_setent(handle, &old, whiteout->i_ino, | |
3583 | EXT4_FT_CHRDEV); | |
3584 | if (retval) | |
3585 | goto end_rename; | |
3586 | ext4_mark_inode_dirty(handle, whiteout); | |
3587 | } | |
c0d268c3 MS |
3588 | if (!new.bh) { |
3589 | retval = ext4_add_entry(handle, new.dentry, old.inode); | |
ac27a0ec DK |
3590 | if (retval) |
3591 | goto end_rename; | |
3592 | } else { | |
bd1af145 | 3593 | retval = ext4_setent(handle, &new, |
cd808dec | 3594 | old.inode->i_ino, old_file_type); |
ef607893 AG |
3595 | if (retval) |
3596 | goto end_rename; | |
ac27a0ec | 3597 | } |
d80d448c DW |
3598 | if (force_reread) |
3599 | force_reread = !ext4_test_inode_flag(new.dir, | |
3600 | EXT4_INODE_INLINE_DATA); | |
ac27a0ec DK |
3601 | |
3602 | /* | |
3603 | * Like most other Unix systems, set the ctime for inodes on a | |
3604 | * rename. | |
3605 | */ | |
eeca7ea1 | 3606 | old.inode->i_ctime = current_time(old.inode); |
c0d268c3 | 3607 | ext4_mark_inode_dirty(handle, old.inode); |
ac27a0ec | 3608 | |
cd808dec MS |
3609 | if (!whiteout) { |
3610 | /* | |
3611 | * ok, that's it | |
3612 | */ | |
3613 | ext4_rename_delete(handle, &old, force_reread); | |
3614 | } | |
ac27a0ec | 3615 | |
c0d268c3 MS |
3616 | if (new.inode) { |
3617 | ext4_dec_count(handle, new.inode); | |
eeca7ea1 | 3618 | new.inode->i_ctime = current_time(new.inode); |
ac27a0ec | 3619 | } |
eeca7ea1 | 3620 | old.dir->i_ctime = old.dir->i_mtime = current_time(old.dir); |
c0d268c3 MS |
3621 | ext4_update_dx_flag(old.dir); |
3622 | if (old.dir_bh) { | |
bd1af145 MS |
3623 | retval = ext4_rename_dir_finish(handle, &old, new.dir->i_ino); |
3624 | if (retval) | |
b4097142 | 3625 | goto end_rename; |
bd1af145 | 3626 | |
c0d268c3 MS |
3627 | ext4_dec_count(handle, old.dir); |
3628 | if (new.inode) { | |
e875a2dd MH |
3629 | /* checked ext4_empty_dir above, can't have another |
3630 | * parent, ext4_dec_count() won't work for many-linked | |
3631 | * dirs */ | |
c0d268c3 | 3632 | clear_nlink(new.inode); |
ac27a0ec | 3633 | } else { |
c0d268c3 MS |
3634 | ext4_inc_count(handle, new.dir); |
3635 | ext4_update_dx_flag(new.dir); | |
3636 | ext4_mark_inode_dirty(handle, new.dir); | |
ac27a0ec DK |
3637 | } |
3638 | } | |
c0d268c3 MS |
3639 | ext4_mark_inode_dirty(handle, old.dir); |
3640 | if (new.inode) { | |
3641 | ext4_mark_inode_dirty(handle, new.inode); | |
3642 | if (!new.inode->i_nlink) | |
3643 | ext4_orphan_add(handle, new.inode); | |
ac27a0ec DK |
3644 | } |
3645 | retval = 0; | |
3646 | ||
3647 | end_rename: | |
c0d268c3 MS |
3648 | brelse(old.dir_bh); |
3649 | brelse(old.bh); | |
3650 | brelse(new.bh); | |
cd808dec MS |
3651 | if (whiteout) { |
3652 | if (retval) | |
3653 | drop_nlink(whiteout); | |
3654 | unlock_new_inode(whiteout); | |
3655 | iput(whiteout); | |
3656 | } | |
5b61de75 TT |
3657 | if (handle) |
3658 | ext4_journal_stop(handle); | |
ac27a0ec DK |
3659 | return retval; |
3660 | } | |
3661 | ||
bd42998a MS |
3662 | static int ext4_cross_rename(struct inode *old_dir, struct dentry *old_dentry, |
3663 | struct inode *new_dir, struct dentry *new_dentry) | |
3664 | { | |
3665 | handle_t *handle = NULL; | |
3666 | struct ext4_renament old = { | |
3667 | .dir = old_dir, | |
3668 | .dentry = old_dentry, | |
2b0143b5 | 3669 | .inode = d_inode(old_dentry), |
bd42998a MS |
3670 | }; |
3671 | struct ext4_renament new = { | |
3672 | .dir = new_dir, | |
3673 | .dentry = new_dentry, | |
2b0143b5 | 3674 | .inode = d_inode(new_dentry), |
bd42998a MS |
3675 | }; |
3676 | u8 new_file_type; | |
3677 | int retval; | |
eeca7ea1 | 3678 | struct timespec ctime; |
bd42998a | 3679 | |
040cb378 LX |
3680 | if ((ext4_test_inode_flag(new_dir, EXT4_INODE_PROJINHERIT) && |
3681 | !projid_eq(EXT4_I(new_dir)->i_projid, | |
3682 | EXT4_I(old_dentry->d_inode)->i_projid)) || | |
3683 | (ext4_test_inode_flag(old_dir, EXT4_INODE_PROJINHERIT) && | |
3684 | !projid_eq(EXT4_I(old_dir)->i_projid, | |
3685 | EXT4_I(new_dentry->d_inode)->i_projid))) | |
3686 | return -EXDEV; | |
3687 | ||
a7cdadee JK |
3688 | retval = dquot_initialize(old.dir); |
3689 | if (retval) | |
3690 | return retval; | |
3691 | retval = dquot_initialize(new.dir); | |
3692 | if (retval) | |
3693 | return retval; | |
bd42998a MS |
3694 | |
3695 | old.bh = ext4_find_entry(old.dir, &old.dentry->d_name, | |
3696 | &old.de, &old.inlined); | |
36de9286 TT |
3697 | if (IS_ERR(old.bh)) |
3698 | return PTR_ERR(old.bh); | |
bd42998a MS |
3699 | /* |
3700 | * Check for inode number is _not_ due to possible IO errors. | |
3701 | * We might rmdir the source, keep it as pwd of some process | |
3702 | * and merrily kill the link to whatever was created under the | |
3703 | * same name. Goodbye sticky bit ;-< | |
3704 | */ | |
3705 | retval = -ENOENT; | |
3706 | if (!old.bh || le32_to_cpu(old.de->inode) != old.inode->i_ino) | |
3707 | goto end_rename; | |
3708 | ||
3709 | new.bh = ext4_find_entry(new.dir, &new.dentry->d_name, | |
3710 | &new.de, &new.inlined); | |
36de9286 TT |
3711 | if (IS_ERR(new.bh)) { |
3712 | retval = PTR_ERR(new.bh); | |
a9cfcd63 | 3713 | new.bh = NULL; |
36de9286 TT |
3714 | goto end_rename; |
3715 | } | |
bd42998a MS |
3716 | |
3717 | /* RENAME_EXCHANGE case: old *and* new must both exist */ | |
3718 | if (!new.bh || le32_to_cpu(new.de->inode) != new.inode->i_ino) | |
3719 | goto end_rename; | |
3720 | ||
3721 | handle = ext4_journal_start(old.dir, EXT4_HT_DIR, | |
3722 | (2 * EXT4_DATA_TRANS_BLOCKS(old.dir->i_sb) + | |
3723 | 2 * EXT4_INDEX_EXTRA_TRANS_BLOCKS + 2)); | |
7071b715 KK |
3724 | if (IS_ERR(handle)) { |
3725 | retval = PTR_ERR(handle); | |
3726 | handle = NULL; | |
3727 | goto end_rename; | |
3728 | } | |
bd42998a MS |
3729 | |
3730 | if (IS_DIRSYNC(old.dir) || IS_DIRSYNC(new.dir)) | |
3731 | ext4_handle_sync(handle); | |
3732 | ||
3733 | if (S_ISDIR(old.inode->i_mode)) { | |
3734 | old.is_dir = true; | |
3735 | retval = ext4_rename_dir_prepare(handle, &old); | |
3736 | if (retval) | |
3737 | goto end_rename; | |
3738 | } | |
3739 | if (S_ISDIR(new.inode->i_mode)) { | |
3740 | new.is_dir = true; | |
3741 | retval = ext4_rename_dir_prepare(handle, &new); | |
3742 | if (retval) | |
3743 | goto end_rename; | |
3744 | } | |
3745 | ||
3746 | /* | |
3747 | * Other than the special case of overwriting a directory, parents' | |
3748 | * nlink only needs to be modified if this is a cross directory rename. | |
3749 | */ | |
3750 | if (old.dir != new.dir && old.is_dir != new.is_dir) { | |
3751 | old.dir_nlink_delta = old.is_dir ? -1 : 1; | |
3752 | new.dir_nlink_delta = -old.dir_nlink_delta; | |
3753 | retval = -EMLINK; | |
3754 | if ((old.dir_nlink_delta > 0 && EXT4_DIR_LINK_MAX(old.dir)) || | |
3755 | (new.dir_nlink_delta > 0 && EXT4_DIR_LINK_MAX(new.dir))) | |
3756 | goto end_rename; | |
3757 | } | |
3758 | ||
3759 | new_file_type = new.de->file_type; | |
3760 | retval = ext4_setent(handle, &new, old.inode->i_ino, old.de->file_type); | |
3761 | if (retval) | |
3762 | goto end_rename; | |
3763 | ||
3764 | retval = ext4_setent(handle, &old, new.inode->i_ino, new_file_type); | |
3765 | if (retval) | |
3766 | goto end_rename; | |
3767 | ||
3768 | /* | |
3769 | * Like most other Unix systems, set the ctime for inodes on a | |
3770 | * rename. | |
3771 | */ | |
eeca7ea1 DD |
3772 | ctime = current_time(old.inode); |
3773 | old.inode->i_ctime = ctime; | |
3774 | new.inode->i_ctime = ctime; | |
bd42998a MS |
3775 | ext4_mark_inode_dirty(handle, old.inode); |
3776 | ext4_mark_inode_dirty(handle, new.inode); | |
3777 | ||
3778 | if (old.dir_bh) { | |
3779 | retval = ext4_rename_dir_finish(handle, &old, new.dir->i_ino); | |
3780 | if (retval) | |
3781 | goto end_rename; | |
3782 | } | |
3783 | if (new.dir_bh) { | |
3784 | retval = ext4_rename_dir_finish(handle, &new, old.dir->i_ino); | |
3785 | if (retval) | |
3786 | goto end_rename; | |
3787 | } | |
3788 | ext4_update_dir_count(handle, &old); | |
3789 | ext4_update_dir_count(handle, &new); | |
3790 | retval = 0; | |
3791 | ||
3792 | end_rename: | |
3793 | brelse(old.dir_bh); | |
3794 | brelse(new.dir_bh); | |
3795 | brelse(old.bh); | |
3796 | brelse(new.bh); | |
3797 | if (handle) | |
3798 | ext4_journal_stop(handle); | |
3799 | return retval; | |
3800 | } | |
3801 | ||
0a7c3937 MS |
3802 | static int ext4_rename2(struct inode *old_dir, struct dentry *old_dentry, |
3803 | struct inode *new_dir, struct dentry *new_dentry, | |
3804 | unsigned int flags) | |
3805 | { | |
07543d16 EB |
3806 | int err; |
3807 | ||
0db1ff22 TT |
3808 | if (unlikely(ext4_forced_shutdown(EXT4_SB(old_dir->i_sb)))) |
3809 | return -EIO; | |
3810 | ||
cd808dec | 3811 | if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT)) |
0a7c3937 MS |
3812 | return -EINVAL; |
3813 | ||
07543d16 EB |
3814 | err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry, |
3815 | flags); | |
3816 | if (err) | |
3817 | return err; | |
3818 | ||
bd42998a MS |
3819 | if (flags & RENAME_EXCHANGE) { |
3820 | return ext4_cross_rename(old_dir, old_dentry, | |
3821 | new_dir, new_dentry); | |
3822 | } | |
cd808dec MS |
3823 | |
3824 | return ext4_rename(old_dir, old_dentry, new_dir, new_dentry, flags); | |
0a7c3937 MS |
3825 | } |
3826 | ||
ac27a0ec DK |
3827 | /* |
3828 | * directories can handle most operations... | |
3829 | */ | |
754661f1 | 3830 | const struct inode_operations ext4_dir_inode_operations = { |
617ba13b MC |
3831 | .create = ext4_create, |
3832 | .lookup = ext4_lookup, | |
3833 | .link = ext4_link, | |
3834 | .unlink = ext4_unlink, | |
3835 | .symlink = ext4_symlink, | |
3836 | .mkdir = ext4_mkdir, | |
3837 | .rmdir = ext4_rmdir, | |
3838 | .mknod = ext4_mknod, | |
af51a2ac | 3839 | .tmpfile = ext4_tmpfile, |
2773bf00 | 3840 | .rename = ext4_rename2, |
617ba13b | 3841 | .setattr = ext4_setattr, |
99652ea5 | 3842 | .getattr = ext4_getattr, |
617ba13b | 3843 | .listxattr = ext4_listxattr, |
4e34e719 | 3844 | .get_acl = ext4_get_acl, |
64e178a7 | 3845 | .set_acl = ext4_set_acl, |
abc8746e | 3846 | .fiemap = ext4_fiemap, |
ac27a0ec DK |
3847 | }; |
3848 | ||
754661f1 | 3849 | const struct inode_operations ext4_special_inode_operations = { |
617ba13b | 3850 | .setattr = ext4_setattr, |
99652ea5 | 3851 | .getattr = ext4_getattr, |
617ba13b | 3852 | .listxattr = ext4_listxattr, |
4e34e719 | 3853 | .get_acl = ext4_get_acl, |
64e178a7 | 3854 | .set_acl = ext4_set_acl, |
ac27a0ec | 3855 | }; |