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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> |
b886ee3e | 38 | #include <linux/unicode.h> |
3dcf5451 CH |
39 | #include "ext4.h" |
40 | #include "ext4_jbd2.h" | |
ac27a0ec | 41 | |
ac27a0ec DK |
42 | #include "xattr.h" |
43 | #include "acl.h" | |
44 | ||
0562e0ba | 45 | #include <trace/events/ext4.h> |
ac27a0ec DK |
46 | /* |
47 | * define how far ahead to read directories while searching them. | |
48 | */ | |
49 | #define NAMEI_RA_CHUNKS 2 | |
50 | #define NAMEI_RA_BLOCKS 4 | |
8c55e204 | 51 | #define NAMEI_RA_SIZE (NAMEI_RA_CHUNKS * NAMEI_RA_BLOCKS) |
ac27a0ec | 52 | |
617ba13b | 53 | static struct buffer_head *ext4_append(handle_t *handle, |
ac27a0ec | 54 | struct inode *inode, |
0f70b406 | 55 | ext4_lblk_t *block) |
ac27a0ec | 56 | { |
b8a04fe7 | 57 | struct ext4_map_blocks map; |
ac27a0ec | 58 | struct buffer_head *bh; |
1c215028 | 59 | int err; |
ac27a0ec | 60 | |
df981d03 TT |
61 | if (unlikely(EXT4_SB(inode->i_sb)->s_max_dir_size_kb && |
62 | ((inode->i_size >> 10) >= | |
0f70b406 TT |
63 | EXT4_SB(inode->i_sb)->s_max_dir_size_kb))) |
64 | return ERR_PTR(-ENOSPC); | |
df981d03 | 65 | |
ac27a0ec | 66 | *block = inode->i_size >> inode->i_sb->s_blocksize_bits; |
b8a04fe7 LC |
67 | map.m_lblk = *block; |
68 | map.m_len = 1; | |
69 | ||
70 | /* | |
71 | * We're appending new directory block. Make sure the block is not | |
72 | * allocated yet, otherwise we will end up corrupting the | |
73 | * directory. | |
74 | */ | |
75 | err = ext4_map_blocks(NULL, inode, &map, 0); | |
76 | if (err < 0) | |
77 | return ERR_PTR(err); | |
78 | if (err) { | |
79 | EXT4_ERROR_INODE(inode, "Logical block already allocated"); | |
80 | return ERR_PTR(-EFSCORRUPTED); | |
81 | } | |
ac27a0ec | 82 | |
c5e298ae | 83 | bh = ext4_bread(handle, inode, *block, EXT4_GET_BLOCKS_CREATE); |
1c215028 TT |
84 | if (IS_ERR(bh)) |
85 | return bh; | |
0f70b406 TT |
86 | inode->i_size += inode->i_sb->s_blocksize; |
87 | EXT4_I(inode)->i_disksize = inode->i_size; | |
7177dd00 ZC |
88 | err = ext4_mark_inode_dirty(handle, inode); |
89 | if (err) | |
90 | goto out; | |
5d601255 | 91 | BUFFER_TRACE(bh, "get_write_access"); |
188c299e JK |
92 | err = ext4_journal_get_write_access(handle, inode->i_sb, bh, |
93 | EXT4_JTR_NONE); | |
7177dd00 ZC |
94 | if (err) |
95 | goto out; | |
ac27a0ec | 96 | return bh; |
7177dd00 ZC |
97 | |
98 | out: | |
99 | brelse(bh); | |
100 | ext4_std_error(inode->i_sb, err); | |
101 | return ERR_PTR(err); | |
ac27a0ec DK |
102 | } |
103 | ||
dc6982ff TT |
104 | static int ext4_dx_csum_verify(struct inode *inode, |
105 | struct ext4_dir_entry *dirent); | |
106 | ||
4e19d6b6 TT |
107 | /* |
108 | * Hints to ext4_read_dirblock regarding whether we expect a directory | |
109 | * block being read to be an index block, or a block containing | |
110 | * directory entries (and if the latter, whether it was found via a | |
111 | * logical block in an htree index block). This is used to control | |
112 | * what sort of sanity checkinig ext4_read_dirblock() will do on the | |
113 | * directory block read from the storage device. EITHER will means | |
114 | * the caller doesn't know what kind of directory block will be read, | |
115 | * so no specific verification will be done. | |
116 | */ | |
dc6982ff | 117 | typedef enum { |
4e19d6b6 | 118 | EITHER, INDEX, DIRENT, DIRENT_HTREE |
dc6982ff TT |
119 | } dirblock_type_t; |
120 | ||
121 | #define ext4_read_dirblock(inode, block, type) \ | |
b03a2f7e | 122 | __ext4_read_dirblock((inode), (block), (type), __func__, __LINE__) |
dc6982ff TT |
123 | |
124 | static struct buffer_head *__ext4_read_dirblock(struct inode *inode, | |
b03a2f7e AD |
125 | ext4_lblk_t block, |
126 | dirblock_type_t type, | |
127 | const char *func, | |
128 | unsigned int line) | |
dc6982ff TT |
129 | { |
130 | struct buffer_head *bh; | |
131 | struct ext4_dir_entry *dirent; | |
1c215028 | 132 | int is_dx_block = 0; |
dc6982ff | 133 | |
61a1d87a | 134 | if (block >= inode->i_size >> inode->i_blkbits) { |
65f8ea4c LC |
135 | ext4_error_inode(inode, func, line, block, |
136 | "Attempting to read directory block (%u) that is past i_size (%llu)", | |
137 | block, inode->i_size); | |
138 | return ERR_PTR(-EFSCORRUPTED); | |
139 | } | |
140 | ||
46f870d6 TT |
141 | if (ext4_simulate_fail(inode->i_sb, EXT4_SIM_DIRBLOCK_EIO)) |
142 | bh = ERR_PTR(-EIO); | |
143 | else | |
144 | bh = ext4_bread(NULL, inode, block, 0); | |
1c215028 | 145 | if (IS_ERR(bh)) { |
b03a2f7e AD |
146 | __ext4_warning(inode->i_sb, func, line, |
147 | "inode #%lu: lblock %lu: comm %s: " | |
148 | "error %ld reading directory block", | |
149 | inode->i_ino, (unsigned long)block, | |
150 | current->comm, PTR_ERR(bh)); | |
1c215028 TT |
151 | |
152 | return bh; | |
153 | } | |
4e19d6b6 | 154 | if (!bh && (type == INDEX || type == DIRENT_HTREE)) { |
b03a2f7e | 155 | ext4_error_inode(inode, func, line, block, |
4e19d6b6 TT |
156 | "Directory hole found for htree %s block", |
157 | (type == INDEX) ? "index" : "leaf"); | |
6a797d27 | 158 | return ERR_PTR(-EFSCORRUPTED); |
dc6982ff | 159 | } |
4e19d6b6 TT |
160 | if (!bh) |
161 | return NULL; | |
dc6982ff TT |
162 | dirent = (struct ext4_dir_entry *) bh->b_data; |
163 | /* Determine whether or not we have an index block */ | |
164 | if (is_dx(inode)) { | |
165 | if (block == 0) | |
166 | is_dx_block = 1; | |
167 | else if (ext4_rec_len_from_disk(dirent->rec_len, | |
168 | inode->i_sb->s_blocksize) == | |
169 | inode->i_sb->s_blocksize) | |
170 | is_dx_block = 1; | |
171 | } | |
172 | if (!is_dx_block && type == INDEX) { | |
b03a2f7e | 173 | ext4_error_inode(inode, func, line, block, |
dc6982ff | 174 | "directory leaf block found instead of index block"); |
de59fae0 | 175 | brelse(bh); |
6a797d27 | 176 | return ERR_PTR(-EFSCORRUPTED); |
dc6982ff | 177 | } |
9aa5d32b | 178 | if (!ext4_has_metadata_csum(inode->i_sb) || |
dc6982ff TT |
179 | buffer_verified(bh)) |
180 | return bh; | |
181 | ||
182 | /* | |
183 | * An empty leaf block can get mistaken for a index block; for | |
184 | * this reason, we can only check the index checksum when the | |
185 | * caller is sure it should be an index block. | |
186 | */ | |
187 | if (is_dx_block && type == INDEX) { | |
46f870d6 TT |
188 | if (ext4_dx_csum_verify(inode, dirent) && |
189 | !ext4_simulate_fail(inode->i_sb, EXT4_SIM_DIRBLOCK_CRC)) | |
dc6982ff TT |
190 | set_buffer_verified(bh); |
191 | else { | |
54d3adbc TT |
192 | ext4_error_inode_err(inode, func, line, block, |
193 | EFSBADCRC, | |
194 | "Directory index failed checksum"); | |
a871611b | 195 | brelse(bh); |
6a797d27 | 196 | return ERR_PTR(-EFSBADCRC); |
a871611b | 197 | } |
ac27a0ec | 198 | } |
dc6982ff | 199 | if (!is_dx_block) { |
46f870d6 TT |
200 | if (ext4_dirblock_csum_verify(inode, bh) && |
201 | !ext4_simulate_fail(inode->i_sb, EXT4_SIM_DIRBLOCK_CRC)) | |
dc6982ff TT |
202 | set_buffer_verified(bh); |
203 | else { | |
54d3adbc TT |
204 | ext4_error_inode_err(inode, func, line, block, |
205 | EFSBADCRC, | |
206 | "Directory block failed checksum"); | |
dc6982ff | 207 | brelse(bh); |
6a797d27 | 208 | return ERR_PTR(-EFSBADCRC); |
dc6982ff | 209 | } |
6d1ab10e | 210 | } |
ac27a0ec DK |
211 | return bh; |
212 | } | |
213 | ||
ac27a0ec DK |
214 | #ifdef DX_DEBUG |
215 | #define dxtrace(command) command | |
216 | #else | |
217 | #define dxtrace(command) | |
218 | #endif | |
219 | ||
220 | struct fake_dirent | |
221 | { | |
222 | __le32 inode; | |
223 | __le16 rec_len; | |
224 | u8 name_len; | |
225 | u8 file_type; | |
226 | }; | |
227 | ||
228 | struct dx_countlimit | |
229 | { | |
230 | __le16 limit; | |
231 | __le16 count; | |
232 | }; | |
233 | ||
234 | struct dx_entry | |
235 | { | |
236 | __le32 hash; | |
237 | __le32 block; | |
238 | }; | |
239 | ||
240 | /* | |
241 | * dx_root_info is laid out so that if it should somehow get overlaid by a | |
242 | * dirent the two low bits of the hash version will be zero. Therefore, the | |
243 | * hash version mod 4 should never be 0. Sincerely, the paranoia department. | |
244 | */ | |
245 | ||
246 | struct dx_root | |
247 | { | |
248 | struct fake_dirent dot; | |
249 | char dot_name[4]; | |
250 | struct fake_dirent dotdot; | |
251 | char dotdot_name[4]; | |
252 | struct dx_root_info | |
253 | { | |
254 | __le32 reserved_zero; | |
255 | u8 hash_version; | |
256 | u8 info_length; /* 8 */ | |
257 | u8 indirect_levels; | |
258 | u8 unused_flags; | |
259 | } | |
260 | info; | |
6cfb061f | 261 | struct dx_entry entries[]; |
ac27a0ec DK |
262 | }; |
263 | ||
264 | struct dx_node | |
265 | { | |
266 | struct fake_dirent fake; | |
6cfb061f | 267 | struct dx_entry entries[]; |
ac27a0ec DK |
268 | }; |
269 | ||
270 | ||
271 | struct dx_frame | |
272 | { | |
273 | struct buffer_head *bh; | |
274 | struct dx_entry *entries; | |
275 | struct dx_entry *at; | |
276 | }; | |
277 | ||
278 | struct dx_map_entry | |
279 | { | |
280 | u32 hash; | |
ef2b02d3 ES |
281 | u16 offs; |
282 | u16 size; | |
ac27a0ec DK |
283 | }; |
284 | ||
e6153918 DW |
285 | /* |
286 | * This goes at the end of each htree block. | |
287 | */ | |
288 | struct dx_tail { | |
289 | u32 dt_reserved; | |
290 | __le32 dt_checksum; /* crc32c(uuid+inum+dirblock) */ | |
291 | }; | |
292 | ||
725d26d3 AK |
293 | static inline ext4_lblk_t dx_get_block(struct dx_entry *entry); |
294 | static void dx_set_block(struct dx_entry *entry, ext4_lblk_t value); | |
af5bc92d TT |
295 | static inline unsigned dx_get_hash(struct dx_entry *entry); |
296 | static void dx_set_hash(struct dx_entry *entry, unsigned value); | |
297 | static unsigned dx_get_count(struct dx_entry *entries); | |
298 | static unsigned dx_get_limit(struct dx_entry *entries); | |
299 | static void dx_set_count(struct dx_entry *entries, unsigned value); | |
300 | static void dx_set_limit(struct dx_entry *entries, unsigned value); | |
301 | static unsigned dx_root_limit(struct inode *dir, unsigned infosize); | |
302 | static unsigned dx_node_limit(struct inode *dir); | |
5b643f9c | 303 | static struct dx_frame *dx_probe(struct ext4_filename *fname, |
ac27a0ec DK |
304 | struct inode *dir, |
305 | struct dx_hash_info *hinfo, | |
dd73b5d5 | 306 | struct dx_frame *frame); |
af5bc92d | 307 | static void dx_release(struct dx_frame *frames); |
46c116b9 JK |
308 | static int dx_make_map(struct inode *dir, struct buffer_head *bh, |
309 | struct dx_hash_info *hinfo, | |
310 | struct dx_map_entry *map_tail); | |
ac27a0ec | 311 | static void dx_sort_map(struct dx_map_entry *map, unsigned count); |
471fbbea DR |
312 | static struct ext4_dir_entry_2 *dx_move_dirents(struct inode *dir, char *from, |
313 | char *to, struct dx_map_entry *offsets, | |
314 | int count, unsigned int blocksize); | |
315 | static struct ext4_dir_entry_2 *dx_pack_dirents(struct inode *dir, char *base, | |
316 | unsigned int blocksize); | |
725d26d3 AK |
317 | static void dx_insert_block(struct dx_frame *frame, |
318 | u32 hash, ext4_lblk_t block); | |
617ba13b | 319 | static int ext4_htree_next_block(struct inode *dir, __u32 hash, |
ac27a0ec DK |
320 | struct dx_frame *frame, |
321 | struct dx_frame *frames, | |
322 | __u32 *start_hash); | |
f702ba0f | 323 | static struct buffer_head * ext4_dx_find_entry(struct inode *dir, |
5b643f9c | 324 | struct ext4_filename *fname, |
537d8f93 | 325 | struct ext4_dir_entry_2 **res_dir); |
5b643f9c | 326 | static int ext4_dx_add_entry(handle_t *handle, struct ext4_filename *fname, |
56a04915 | 327 | struct inode *dir, struct inode *inode); |
ac27a0ec | 328 | |
dbe89444 | 329 | /* checksumming functions */ |
ddce3b94 TT |
330 | void ext4_initialize_dirent_tail(struct buffer_head *bh, |
331 | unsigned int blocksize) | |
b0336e8d | 332 | { |
ddce3b94 TT |
333 | struct ext4_dir_entry_tail *t = EXT4_DIRENT_TAIL(bh->b_data, blocksize); |
334 | ||
b0336e8d DW |
335 | memset(t, 0, sizeof(struct ext4_dir_entry_tail)); |
336 | t->det_rec_len = ext4_rec_len_to_disk( | |
337 | sizeof(struct ext4_dir_entry_tail), blocksize); | |
338 | t->det_reserved_ft = EXT4_FT_DIR_CSUM; | |
339 | } | |
340 | ||
341 | /* Walk through a dirent block to find a checksum "dirent" at the tail */ | |
342 | static struct ext4_dir_entry_tail *get_dirent_tail(struct inode *inode, | |
f036adb3 | 343 | struct buffer_head *bh) |
b0336e8d DW |
344 | { |
345 | struct ext4_dir_entry_tail *t; | |
7fda67e8 | 346 | int blocksize = EXT4_BLOCK_SIZE(inode->i_sb); |
b0336e8d DW |
347 | |
348 | #ifdef PARANOID | |
349 | struct ext4_dir_entry *d, *top; | |
350 | ||
f036adb3 TT |
351 | d = (struct ext4_dir_entry *)bh->b_data; |
352 | top = (struct ext4_dir_entry *)(bh->b_data + | |
7fda67e8 SZ |
353 | (blocksize - sizeof(struct ext4_dir_entry_tail))); |
354 | while (d < top && ext4_rec_len_from_disk(d->rec_len, blocksize)) | |
b0336e8d | 355 | d = (struct ext4_dir_entry *)(((void *)d) + |
7fda67e8 | 356 | ext4_rec_len_from_disk(d->rec_len, blocksize)); |
b0336e8d DW |
357 | |
358 | if (d != top) | |
359 | return NULL; | |
360 | ||
361 | t = (struct ext4_dir_entry_tail *)d; | |
362 | #else | |
f036adb3 | 363 | t = EXT4_DIRENT_TAIL(bh->b_data, EXT4_BLOCK_SIZE(inode->i_sb)); |
b0336e8d DW |
364 | #endif |
365 | ||
366 | if (t->det_reserved_zero1 || | |
7fda67e8 SZ |
367 | (ext4_rec_len_from_disk(t->det_rec_len, blocksize) != |
368 | sizeof(struct ext4_dir_entry_tail)) || | |
b0336e8d DW |
369 | t->det_reserved_zero2 || |
370 | t->det_reserved_ft != EXT4_FT_DIR_CSUM) | |
371 | return NULL; | |
372 | ||
373 | return t; | |
374 | } | |
375 | ||
f036adb3 | 376 | static __le32 ext4_dirblock_csum(struct inode *inode, void *dirent, int size) |
b0336e8d DW |
377 | { |
378 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
379 | struct ext4_inode_info *ei = EXT4_I(inode); | |
380 | __u32 csum; | |
381 | ||
382 | csum = ext4_chksum(sbi, ei->i_csum_seed, (__u8 *)dirent, size); | |
383 | return cpu_to_le32(csum); | |
384 | } | |
385 | ||
b03a2f7e AD |
386 | #define warn_no_space_for_csum(inode) \ |
387 | __warn_no_space_for_csum((inode), __func__, __LINE__) | |
388 | ||
389 | static void __warn_no_space_for_csum(struct inode *inode, const char *func, | |
390 | unsigned int line) | |
dffe9d8d | 391 | { |
b03a2f7e AD |
392 | __ext4_warning_inode(inode, func, line, |
393 | "No space for directory leaf checksum. Please run e2fsck -D."); | |
dffe9d8d TT |
394 | } |
395 | ||
f036adb3 | 396 | int ext4_dirblock_csum_verify(struct inode *inode, struct buffer_head *bh) |
b0336e8d DW |
397 | { |
398 | struct ext4_dir_entry_tail *t; | |
399 | ||
9aa5d32b | 400 | if (!ext4_has_metadata_csum(inode->i_sb)) |
b0336e8d DW |
401 | return 1; |
402 | ||
f036adb3 | 403 | t = get_dirent_tail(inode, bh); |
b0336e8d | 404 | if (!t) { |
dffe9d8d | 405 | warn_no_space_for_csum(inode); |
b0336e8d DW |
406 | return 0; |
407 | } | |
408 | ||
f036adb3 | 409 | if (t->det_checksum != ext4_dirblock_csum(inode, bh->b_data, |
ddce3b94 | 410 | (char *)t - bh->b_data)) |
b0336e8d DW |
411 | return 0; |
412 | ||
413 | return 1; | |
414 | } | |
415 | ||
f036adb3 TT |
416 | static void ext4_dirblock_csum_set(struct inode *inode, |
417 | struct buffer_head *bh) | |
b0336e8d DW |
418 | { |
419 | struct ext4_dir_entry_tail *t; | |
420 | ||
9aa5d32b | 421 | if (!ext4_has_metadata_csum(inode->i_sb)) |
b0336e8d DW |
422 | return; |
423 | ||
f036adb3 | 424 | t = get_dirent_tail(inode, bh); |
b0336e8d | 425 | if (!t) { |
dffe9d8d | 426 | warn_no_space_for_csum(inode); |
b0336e8d DW |
427 | return; |
428 | } | |
429 | ||
f036adb3 | 430 | t->det_checksum = ext4_dirblock_csum(inode, bh->b_data, |
ddce3b94 | 431 | (char *)t - bh->b_data); |
b0336e8d DW |
432 | } |
433 | ||
f036adb3 TT |
434 | int ext4_handle_dirty_dirblock(handle_t *handle, |
435 | struct inode *inode, | |
436 | struct buffer_head *bh) | |
b0336e8d | 437 | { |
f036adb3 | 438 | ext4_dirblock_csum_set(inode, bh); |
b0336e8d DW |
439 | return ext4_handle_dirty_metadata(handle, inode, bh); |
440 | } | |
441 | ||
dbe89444 DW |
442 | static struct dx_countlimit *get_dx_countlimit(struct inode *inode, |
443 | struct ext4_dir_entry *dirent, | |
444 | int *offset) | |
445 | { | |
446 | struct ext4_dir_entry *dp; | |
447 | struct dx_root_info *root; | |
448 | int count_offset; | |
7fda67e8 SZ |
449 | int blocksize = EXT4_BLOCK_SIZE(inode->i_sb); |
450 | unsigned int rlen = ext4_rec_len_from_disk(dirent->rec_len, blocksize); | |
dbe89444 | 451 | |
7fda67e8 | 452 | if (rlen == blocksize) |
dbe89444 | 453 | count_offset = 8; |
7fda67e8 | 454 | else if (rlen == 12) { |
dbe89444 | 455 | dp = (struct ext4_dir_entry *)(((void *)dirent) + 12); |
7fda67e8 | 456 | if (ext4_rec_len_from_disk(dp->rec_len, blocksize) != blocksize - 12) |
dbe89444 DW |
457 | return NULL; |
458 | root = (struct dx_root_info *)(((void *)dp + 12)); | |
459 | if (root->reserved_zero || | |
460 | root->info_length != sizeof(struct dx_root_info)) | |
461 | return NULL; | |
462 | count_offset = 32; | |
463 | } else | |
464 | return NULL; | |
465 | ||
466 | if (offset) | |
467 | *offset = count_offset; | |
468 | return (struct dx_countlimit *)(((void *)dirent) + count_offset); | |
469 | } | |
470 | ||
471 | static __le32 ext4_dx_csum(struct inode *inode, struct ext4_dir_entry *dirent, | |
472 | int count_offset, int count, struct dx_tail *t) | |
473 | { | |
474 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
475 | struct ext4_inode_info *ei = EXT4_I(inode); | |
d6a77105 | 476 | __u32 csum; |
dbe89444 | 477 | int size; |
b47820ed DJ |
478 | __u32 dummy_csum = 0; |
479 | int offset = offsetof(struct dx_tail, dt_checksum); | |
dbe89444 DW |
480 | |
481 | size = count_offset + (count * sizeof(struct dx_entry)); | |
dbe89444 | 482 | csum = ext4_chksum(sbi, ei->i_csum_seed, (__u8 *)dirent, size); |
b47820ed DJ |
483 | csum = ext4_chksum(sbi, csum, (__u8 *)t, offset); |
484 | csum = ext4_chksum(sbi, csum, (__u8 *)&dummy_csum, sizeof(dummy_csum)); | |
dbe89444 DW |
485 | |
486 | return cpu_to_le32(csum); | |
487 | } | |
488 | ||
489 | static int ext4_dx_csum_verify(struct inode *inode, | |
490 | struct ext4_dir_entry *dirent) | |
491 | { | |
492 | struct dx_countlimit *c; | |
493 | struct dx_tail *t; | |
494 | int count_offset, limit, count; | |
495 | ||
9aa5d32b | 496 | if (!ext4_has_metadata_csum(inode->i_sb)) |
dbe89444 DW |
497 | return 1; |
498 | ||
499 | c = get_dx_countlimit(inode, dirent, &count_offset); | |
500 | if (!c) { | |
501 | EXT4_ERROR_INODE(inode, "dir seems corrupt? Run e2fsck -D."); | |
fa964540 | 502 | return 0; |
dbe89444 DW |
503 | } |
504 | limit = le16_to_cpu(c->limit); | |
505 | count = le16_to_cpu(c->count); | |
506 | if (count_offset + (limit * sizeof(struct dx_entry)) > | |
507 | EXT4_BLOCK_SIZE(inode->i_sb) - sizeof(struct dx_tail)) { | |
dffe9d8d | 508 | warn_no_space_for_csum(inode); |
fa964540 | 509 | return 0; |
dbe89444 DW |
510 | } |
511 | t = (struct dx_tail *)(((struct dx_entry *)c) + limit); | |
512 | ||
513 | if (t->dt_checksum != ext4_dx_csum(inode, dirent, count_offset, | |
514 | count, t)) | |
515 | return 0; | |
516 | return 1; | |
517 | } | |
518 | ||
519 | static void ext4_dx_csum_set(struct inode *inode, struct ext4_dir_entry *dirent) | |
520 | { | |
521 | struct dx_countlimit *c; | |
522 | struct dx_tail *t; | |
523 | int count_offset, limit, count; | |
524 | ||
9aa5d32b | 525 | if (!ext4_has_metadata_csum(inode->i_sb)) |
dbe89444 DW |
526 | return; |
527 | ||
528 | c = get_dx_countlimit(inode, dirent, &count_offset); | |
529 | if (!c) { | |
530 | EXT4_ERROR_INODE(inode, "dir seems corrupt? Run e2fsck -D."); | |
531 | return; | |
532 | } | |
533 | limit = le16_to_cpu(c->limit); | |
534 | count = le16_to_cpu(c->count); | |
535 | if (count_offset + (limit * sizeof(struct dx_entry)) > | |
536 | EXT4_BLOCK_SIZE(inode->i_sb) - sizeof(struct dx_tail)) { | |
dffe9d8d | 537 | warn_no_space_for_csum(inode); |
dbe89444 DW |
538 | return; |
539 | } | |
540 | t = (struct dx_tail *)(((struct dx_entry *)c) + limit); | |
541 | ||
542 | t->dt_checksum = ext4_dx_csum(inode, dirent, count_offset, count, t); | |
543 | } | |
544 | ||
545 | static inline int ext4_handle_dirty_dx_node(handle_t *handle, | |
546 | struct inode *inode, | |
547 | struct buffer_head *bh) | |
548 | { | |
549 | ext4_dx_csum_set(inode, (struct ext4_dir_entry *)bh->b_data); | |
550 | return ext4_handle_dirty_metadata(handle, inode, bh); | |
551 | } | |
552 | ||
f795e140 LZ |
553 | /* |
554 | * p is at least 6 bytes before the end of page | |
555 | */ | |
556 | static inline struct ext4_dir_entry_2 * | |
3d0518f4 | 557 | ext4_next_entry(struct ext4_dir_entry_2 *p, unsigned long blocksize) |
f795e140 LZ |
558 | { |
559 | return (struct ext4_dir_entry_2 *)((char *)p + | |
3d0518f4 | 560 | ext4_rec_len_from_disk(p->rec_len, blocksize)); |
f795e140 LZ |
561 | } |
562 | ||
ac27a0ec DK |
563 | /* |
564 | * Future: use high four bits of block for coalesce-on-delete flags | |
565 | * Mask them off for now. | |
566 | */ | |
567 | ||
725d26d3 | 568 | static inline ext4_lblk_t dx_get_block(struct dx_entry *entry) |
ac27a0ec | 569 | { |
e08ac99f | 570 | return le32_to_cpu(entry->block) & 0x0fffffff; |
ac27a0ec DK |
571 | } |
572 | ||
725d26d3 | 573 | static inline void dx_set_block(struct dx_entry *entry, ext4_lblk_t value) |
ac27a0ec DK |
574 | { |
575 | entry->block = cpu_to_le32(value); | |
576 | } | |
577 | ||
af5bc92d | 578 | static inline unsigned dx_get_hash(struct dx_entry *entry) |
ac27a0ec DK |
579 | { |
580 | return le32_to_cpu(entry->hash); | |
581 | } | |
582 | ||
af5bc92d | 583 | static inline void dx_set_hash(struct dx_entry *entry, unsigned value) |
ac27a0ec DK |
584 | { |
585 | entry->hash = cpu_to_le32(value); | |
586 | } | |
587 | ||
af5bc92d | 588 | static inline unsigned dx_get_count(struct dx_entry *entries) |
ac27a0ec DK |
589 | { |
590 | return le16_to_cpu(((struct dx_countlimit *) entries)->count); | |
591 | } | |
592 | ||
af5bc92d | 593 | static inline unsigned dx_get_limit(struct dx_entry *entries) |
ac27a0ec DK |
594 | { |
595 | return le16_to_cpu(((struct dx_countlimit *) entries)->limit); | |
596 | } | |
597 | ||
af5bc92d | 598 | static inline void dx_set_count(struct dx_entry *entries, unsigned value) |
ac27a0ec DK |
599 | { |
600 | ((struct dx_countlimit *) entries)->count = cpu_to_le16(value); | |
601 | } | |
602 | ||
af5bc92d | 603 | static inline void dx_set_limit(struct dx_entry *entries, unsigned value) |
ac27a0ec DK |
604 | { |
605 | ((struct dx_countlimit *) entries)->limit = cpu_to_le16(value); | |
606 | } | |
607 | ||
af5bc92d | 608 | static inline unsigned dx_root_limit(struct inode *dir, unsigned infosize) |
ac27a0ec | 609 | { |
471fbbea DR |
610 | unsigned int entry_space = dir->i_sb->s_blocksize - |
611 | ext4_dir_rec_len(1, NULL) - | |
612 | ext4_dir_rec_len(2, NULL) - infosize; | |
dbe89444 | 613 | |
9aa5d32b | 614 | if (ext4_has_metadata_csum(dir->i_sb)) |
dbe89444 | 615 | entry_space -= sizeof(struct dx_tail); |
d9c769b7 | 616 | return entry_space / sizeof(struct dx_entry); |
ac27a0ec DK |
617 | } |
618 | ||
af5bc92d | 619 | static inline unsigned dx_node_limit(struct inode *dir) |
ac27a0ec | 620 | { |
471fbbea DR |
621 | unsigned int entry_space = dir->i_sb->s_blocksize - |
622 | ext4_dir_rec_len(0, dir); | |
dbe89444 | 623 | |
9aa5d32b | 624 | if (ext4_has_metadata_csum(dir->i_sb)) |
dbe89444 | 625 | entry_space -= sizeof(struct dx_tail); |
d9c769b7 | 626 | return entry_space / sizeof(struct dx_entry); |
ac27a0ec DK |
627 | } |
628 | ||
629 | /* | |
630 | * Debug | |
631 | */ | |
632 | #ifdef DX_DEBUG | |
4776004f | 633 | static void dx_show_index(char * label, struct dx_entry *entries) |
ac27a0ec | 634 | { |
63f57933 | 635 | int i, n = dx_get_count (entries); |
d74f3d25 | 636 | printk(KERN_DEBUG "%s index", label); |
63f57933 | 637 | for (i = 0; i < n; i++) { |
d74f3d25 JP |
638 | printk(KERN_CONT " %x->%lu", |
639 | i ? dx_get_hash(entries + i) : 0, | |
640 | (unsigned long)dx_get_block(entries + i)); | |
63f57933 | 641 | } |
d74f3d25 | 642 | printk(KERN_CONT "\n"); |
ac27a0ec DK |
643 | } |
644 | ||
645 | struct stats | |
646 | { | |
647 | unsigned names; | |
648 | unsigned space; | |
649 | unsigned bcount; | |
650 | }; | |
651 | ||
b3098486 MH |
652 | static struct stats dx_show_leaf(struct inode *dir, |
653 | struct dx_hash_info *hinfo, | |
654 | struct ext4_dir_entry_2 *de, | |
655 | int size, int show_names) | |
ac27a0ec DK |
656 | { |
657 | unsigned names = 0, space = 0; | |
658 | char *base = (char *) de; | |
659 | struct dx_hash_info h = *hinfo; | |
660 | ||
661 | printk("names: "); | |
662 | while ((char *) de < base + size) | |
663 | { | |
664 | if (de->inode) | |
665 | { | |
666 | if (show_names) | |
667 | { | |
643fa961 | 668 | #ifdef CONFIG_FS_ENCRYPTION |
b3098486 MH |
669 | int len; |
670 | char *name; | |
a7550b30 JK |
671 | struct fscrypt_str fname_crypto_str = |
672 | FSTR_INIT(NULL, 0); | |
c936e1ec | 673 | int res = 0; |
b3098486 MH |
674 | |
675 | name = de->name; | |
676 | len = de->name_len; | |
91d0d892 | 677 | if (!IS_ENCRYPTED(dir)) { |
b3098486 | 678 | /* Directory is not encrypted */ |
4b3cb1d1 | 679 | (void) ext4fs_dirhash(dir, de->name, |
b3098486 MH |
680 | de->name_len, &h); |
681 | printk("%*.s:(U)%x.%u ", len, | |
682 | name, h.hash, | |
683 | (unsigned) ((char *) de | |
684 | - base)); | |
685 | } else { | |
a7550b30 JK |
686 | struct fscrypt_str de_name = |
687 | FSTR_INIT(name, len); | |
688 | ||
b3098486 | 689 | /* Directory is encrypted */ |
a7550b30 | 690 | res = fscrypt_fname_alloc_buffer( |
8b10fe68 | 691 | len, &fname_crypto_str); |
ef1eb3aa | 692 | if (res) |
b3098486 MH |
693 | printk(KERN_WARNING "Error " |
694 | "allocating crypto " | |
695 | "buffer--skipping " | |
696 | "crypto\n"); | |
a7550b30 JK |
697 | res = fscrypt_fname_disk_to_usr(dir, |
698 | 0, 0, &de_name, | |
699 | &fname_crypto_str); | |
ef1eb3aa | 700 | if (res) { |
b3098486 MH |
701 | printk(KERN_WARNING "Error " |
702 | "converting filename " | |
703 | "from disk to usr" | |
704 | "\n"); | |
705 | name = "??"; | |
706 | len = 2; | |
707 | } else { | |
708 | name = fname_crypto_str.name; | |
709 | len = fname_crypto_str.len; | |
710 | } | |
471fbbea DR |
711 | if (IS_CASEFOLDED(dir)) |
712 | h.hash = EXT4_DIRENT_HASH(de); | |
713 | else | |
4b3cb1d1 TT |
714 | (void) ext4fs_dirhash(dir, |
715 | de->name, | |
716 | de->name_len, &h); | |
b3098486 MH |
717 | printk("%*.s:(E)%x.%u ", len, name, |
718 | h.hash, (unsigned) ((char *) de | |
719 | - base)); | |
a7550b30 JK |
720 | fscrypt_fname_free_buffer( |
721 | &fname_crypto_str); | |
b3098486 MH |
722 | } |
723 | #else | |
ac27a0ec DK |
724 | int len = de->name_len; |
725 | char *name = de->name; | |
4b3cb1d1 TT |
726 | (void) ext4fs_dirhash(dir, de->name, |
727 | de->name_len, &h); | |
b3098486 | 728 | printk("%*.s:%x.%u ", len, name, h.hash, |
265c6a0f | 729 | (unsigned) ((char *) de - base)); |
b3098486 | 730 | #endif |
ac27a0ec | 731 | } |
471fbbea | 732 | space += ext4_dir_rec_len(de->name_len, dir); |
ac27a0ec DK |
733 | names++; |
734 | } | |
3d0518f4 | 735 | de = ext4_next_entry(de, size); |
ac27a0ec | 736 | } |
d74f3d25 | 737 | printk(KERN_CONT "(%i)\n", names); |
ac27a0ec DK |
738 | return (struct stats) { names, space, 1 }; |
739 | } | |
740 | ||
741 | struct stats dx_show_entries(struct dx_hash_info *hinfo, struct inode *dir, | |
742 | struct dx_entry *entries, int levels) | |
743 | { | |
744 | unsigned blocksize = dir->i_sb->s_blocksize; | |
af5bc92d | 745 | unsigned count = dx_get_count(entries), names = 0, space = 0, i; |
ac27a0ec DK |
746 | unsigned bcount = 0; |
747 | struct buffer_head *bh; | |
ac27a0ec DK |
748 | printk("%i indexed blocks...\n", count); |
749 | for (i = 0; i < count; i++, entries++) | |
750 | { | |
725d26d3 AK |
751 | ext4_lblk_t block = dx_get_block(entries); |
752 | ext4_lblk_t hash = i ? dx_get_hash(entries): 0; | |
ac27a0ec DK |
753 | u32 range = i < count - 1? (dx_get_hash(entries + 1) - hash): ~hash; |
754 | struct stats stats; | |
755 | printk("%s%3u:%03u hash %8x/%8x ",levels?"":" ", i, block, hash, range); | |
1c215028 TT |
756 | bh = ext4_bread(NULL,dir, block, 0); |
757 | if (!bh || IS_ERR(bh)) | |
758 | continue; | |
ac27a0ec DK |
759 | stats = levels? |
760 | dx_show_entries(hinfo, dir, ((struct dx_node *) bh->b_data)->entries, levels - 1): | |
b3098486 MH |
761 | dx_show_leaf(dir, hinfo, (struct ext4_dir_entry_2 *) |
762 | bh->b_data, blocksize, 0); | |
ac27a0ec DK |
763 | names += stats.names; |
764 | space += stats.space; | |
765 | bcount += stats.bcount; | |
af5bc92d | 766 | brelse(bh); |
ac27a0ec DK |
767 | } |
768 | if (bcount) | |
60e6679e | 769 | printk(KERN_DEBUG "%snames %u, fullness %u (%u%%)\n", |
4776004f TT |
770 | levels ? "" : " ", names, space/bcount, |
771 | (space/bcount)*100/blocksize); | |
ac27a0ec DK |
772 | return (struct stats) { names, space, bcount}; |
773 | } | |
c6c818e5 VT |
774 | |
775 | /* | |
776 | * Linear search cross check | |
777 | */ | |
778 | static inline void htree_rep_invariant_check(struct dx_entry *at, | |
779 | struct dx_entry *target, | |
780 | u32 hash, unsigned int n) | |
781 | { | |
782 | while (n--) { | |
783 | dxtrace(printk(KERN_CONT ",")); | |
784 | if (dx_get_hash(++at) > hash) { | |
785 | at--; | |
786 | break; | |
787 | } | |
788 | } | |
789 | ASSERT(at == target - 1); | |
790 | } | |
791 | #else /* DX_DEBUG */ | |
792 | static inline void htree_rep_invariant_check(struct dx_entry *at, | |
793 | struct dx_entry *target, | |
794 | u32 hash, unsigned int n) | |
795 | { | |
796 | } | |
ac27a0ec DK |
797 | #endif /* DX_DEBUG */ |
798 | ||
799 | /* | |
800 | * Probe for a directory leaf block to search. | |
801 | * | |
802 | * dx_probe can return ERR_BAD_DX_DIR, which means there was a format | |
803 | * error in the directory index, and the caller should fall back to | |
804 | * searching the directory normally. The callers of dx_probe **MUST** | |
805 | * check for this error code, and make sure it never gets reflected | |
806 | * back to userspace. | |
807 | */ | |
808 | static struct dx_frame * | |
5b643f9c | 809 | dx_probe(struct ext4_filename *fname, struct inode *dir, |
dd73b5d5 | 810 | struct dx_hash_info *hinfo, struct dx_frame *frame_in) |
ac27a0ec | 811 | { |
3ba733f8 | 812 | unsigned count, indirect, level, i; |
ac27a0ec DK |
813 | struct dx_entry *at, *entries, *p, *q, *m; |
814 | struct dx_root *root; | |
ac27a0ec | 815 | struct dx_frame *frame = frame_in; |
dd73b5d5 | 816 | struct dx_frame *ret_err = ERR_PTR(ERR_BAD_DX_DIR); |
ac27a0ec | 817 | u32 hash; |
3ba733f8 JK |
818 | ext4_lblk_t block; |
819 | ext4_lblk_t blocks[EXT4_HTREE_LEVEL]; | |
ac27a0ec | 820 | |
e08ac99f | 821 | memset(frame_in, 0, EXT4_HTREE_LEVEL * sizeof(frame_in[0])); |
dd73b5d5 TT |
822 | frame->bh = ext4_read_dirblock(dir, 0, INDEX); |
823 | if (IS_ERR(frame->bh)) | |
824 | return (struct dx_frame *) frame->bh; | |
825 | ||
826 | root = (struct dx_root *) frame->bh->b_data; | |
ac27a0ec DK |
827 | if (root->info.hash_version != DX_HASH_TEA && |
828 | root->info.hash_version != DX_HASH_HALF_MD4 && | |
471fbbea DR |
829 | root->info.hash_version != DX_HASH_LEGACY && |
830 | root->info.hash_version != DX_HASH_SIPHASH) { | |
b03a2f7e AD |
831 | ext4_warning_inode(dir, "Unrecognised inode hash code %u", |
832 | root->info.hash_version); | |
ac27a0ec DK |
833 | goto fail; |
834 | } | |
471fbbea DR |
835 | if (ext4_hash_in_dirent(dir)) { |
836 | if (root->info.hash_version != DX_HASH_SIPHASH) { | |
837 | ext4_warning_inode(dir, | |
838 | "Hash in dirent, but hash is not SIPHASH"); | |
839 | goto fail; | |
840 | } | |
841 | } else { | |
842 | if (root->info.hash_version == DX_HASH_SIPHASH) { | |
843 | ext4_warning_inode(dir, | |
844 | "Hash code is SIPHASH, but hash not in dirent"); | |
845 | goto fail; | |
846 | } | |
847 | } | |
5b643f9c TT |
848 | if (fname) |
849 | hinfo = &fname->hinfo; | |
ac27a0ec | 850 | hinfo->hash_version = root->info.hash_version; |
f99b2589 TT |
851 | if (hinfo->hash_version <= DX_HASH_TEA) |
852 | hinfo->hash_version += EXT4_SB(dir->i_sb)->s_hash_unsigned; | |
617ba13b | 853 | hinfo->seed = EXT4_SB(dir->i_sb)->s_hash_seed; |
1ae98e29 DR |
854 | /* hash is already computed for encrypted casefolded directory */ |
855 | if (fname && fname_name(fname) && | |
4b3cb1d1 TT |
856 | !(IS_ENCRYPTED(dir) && IS_CASEFOLDED(dir))) { |
857 | int ret = ext4fs_dirhash(dir, fname_name(fname), | |
858 | fname_len(fname), hinfo); | |
859 | if (ret < 0) { | |
860 | ret_err = ERR_PTR(ret); | |
861 | goto fail; | |
862 | } | |
863 | } | |
ac27a0ec DK |
864 | hash = hinfo->hash; |
865 | ||
866 | if (root->info.unused_flags & 1) { | |
b03a2f7e AD |
867 | ext4_warning_inode(dir, "Unimplemented hash flags: %#06x", |
868 | root->info.unused_flags); | |
ac27a0ec DK |
869 | goto fail; |
870 | } | |
871 | ||
b03a2f7e | 872 | indirect = root->info.indirect_levels; |
e08ac99f AB |
873 | if (indirect >= ext4_dir_htree_level(dir->i_sb)) { |
874 | ext4_warning(dir->i_sb, | |
875 | "Directory (ino: %lu) htree depth %#06x exceed" | |
876 | "supported value", dir->i_ino, | |
877 | ext4_dir_htree_level(dir->i_sb)); | |
878 | if (ext4_dir_htree_level(dir->i_sb) < EXT4_HTREE_LEVEL) { | |
879 | ext4_warning(dir->i_sb, "Enable large directory " | |
880 | "feature to access it"); | |
881 | } | |
ac27a0ec DK |
882 | goto fail; |
883 | } | |
884 | ||
b03a2f7e AD |
885 | entries = (struct dx_entry *)(((char *)&root->info) + |
886 | root->info.info_length); | |
3d82abae ES |
887 | |
888 | if (dx_get_limit(entries) != dx_root_limit(dir, | |
889 | root->info.info_length)) { | |
b03a2f7e AD |
890 | ext4_warning_inode(dir, "dx entry: limit %u != root limit %u", |
891 | dx_get_limit(entries), | |
892 | dx_root_limit(dir, root->info.info_length)); | |
3d82abae ES |
893 | goto fail; |
894 | } | |
895 | ||
af5bc92d | 896 | dxtrace(printk("Look up %x", hash)); |
3ba733f8 JK |
897 | level = 0; |
898 | blocks[0] = 0; | |
dd73b5d5 | 899 | while (1) { |
ac27a0ec | 900 | count = dx_get_count(entries); |
3d82abae | 901 | if (!count || count > dx_get_limit(entries)) { |
b03a2f7e AD |
902 | ext4_warning_inode(dir, |
903 | "dx entry: count %u beyond limit %u", | |
904 | count, dx_get_limit(entries)); | |
dd73b5d5 | 905 | goto fail; |
3d82abae ES |
906 | } |
907 | ||
ac27a0ec DK |
908 | p = entries + 1; |
909 | q = entries + count - 1; | |
dd73b5d5 | 910 | while (p <= q) { |
b03a2f7e | 911 | m = p + (q - p) / 2; |
d74f3d25 | 912 | dxtrace(printk(KERN_CONT ".")); |
ac27a0ec DK |
913 | if (dx_get_hash(m) > hash) |
914 | q = m - 1; | |
915 | else | |
916 | p = m + 1; | |
917 | } | |
918 | ||
c6c818e5 | 919 | htree_rep_invariant_check(entries, p, hash, count - 1); |
ac27a0ec DK |
920 | |
921 | at = p - 1; | |
d74f3d25 JP |
922 | dxtrace(printk(KERN_CONT " %x->%u\n", |
923 | at == entries ? 0 : dx_get_hash(at), | |
b03a2f7e | 924 | dx_get_block(at))); |
ac27a0ec DK |
925 | frame->entries = entries; |
926 | frame->at = at; | |
3ba733f8 JK |
927 | |
928 | block = dx_get_block(at); | |
929 | for (i = 0; i <= level; i++) { | |
930 | if (blocks[i] == block) { | |
931 | ext4_warning_inode(dir, | |
932 | "dx entry: tree cycle block %u points back to block %u", | |
933 | blocks[level], block); | |
934 | goto fail; | |
935 | } | |
936 | } | |
937 | if (++level > indirect) | |
dd73b5d5 | 938 | return frame; |
3ba733f8 | 939 | blocks[level] = block; |
dd73b5d5 | 940 | frame++; |
3ba733f8 | 941 | frame->bh = ext4_read_dirblock(dir, block, INDEX); |
dd73b5d5 TT |
942 | if (IS_ERR(frame->bh)) { |
943 | ret_err = (struct dx_frame *) frame->bh; | |
944 | frame->bh = NULL; | |
945 | goto fail; | |
dbe89444 | 946 | } |
3ba733f8 | 947 | |
dd73b5d5 | 948 | entries = ((struct dx_node *) frame->bh->b_data)->entries; |
dbe89444 | 949 | |
b03a2f7e AD |
950 | if (dx_get_limit(entries) != dx_node_limit(dir)) { |
951 | ext4_warning_inode(dir, | |
952 | "dx entry: limit %u != node limit %u", | |
953 | dx_get_limit(entries), dx_node_limit(dir)); | |
dd73b5d5 | 954 | goto fail; |
3d82abae | 955 | } |
ac27a0ec | 956 | } |
dd73b5d5 | 957 | fail: |
ac27a0ec DK |
958 | while (frame >= frame_in) { |
959 | brelse(frame->bh); | |
960 | frame--; | |
961 | } | |
b3098486 | 962 | |
dd73b5d5 | 963 | if (ret_err == ERR_PTR(ERR_BAD_DX_DIR)) |
b03a2f7e AD |
964 | ext4_warning_inode(dir, |
965 | "Corrupt directory, running e2fsck is recommended"); | |
dd73b5d5 | 966 | return ret_err; |
ac27a0ec DK |
967 | } |
968 | ||
b03a2f7e | 969 | static void dx_release(struct dx_frame *frames) |
ac27a0ec | 970 | { |
e08ac99f AB |
971 | struct dx_root_info *info; |
972 | int i; | |
08fc98a4 | 973 | unsigned int indirect_levels; |
e08ac99f | 974 | |
ac27a0ec DK |
975 | if (frames[0].bh == NULL) |
976 | return; | |
977 | ||
e08ac99f | 978 | info = &((struct dx_root *)frames[0].bh->b_data)->info; |
08fc98a4 ST |
979 | /* save local copy, "info" may be freed after brelse() */ |
980 | indirect_levels = info->indirect_levels; | |
981 | for (i = 0; i <= indirect_levels; i++) { | |
e08ac99f AB |
982 | if (frames[i].bh == NULL) |
983 | break; | |
984 | brelse(frames[i].bh); | |
985 | frames[i].bh = NULL; | |
986 | } | |
ac27a0ec DK |
987 | } |
988 | ||
989 | /* | |
990 | * This function increments the frame pointer to search the next leaf | |
991 | * block, and reads in the necessary intervening nodes if the search | |
992 | * should be necessary. Whether or not the search is necessary is | |
993 | * controlled by the hash parameter. If the hash value is even, then | |
994 | * the search is only continued if the next block starts with that | |
995 | * hash value. This is used if we are searching for a specific file. | |
996 | * | |
997 | * If the hash value is HASH_NB_ALWAYS, then always go to the next block. | |
998 | * | |
999 | * This function returns 1 if the caller should continue to search, | |
1000 | * or 0 if it should not. If there is an error reading one of the | |
1001 | * index blocks, it will a negative error code. | |
1002 | * | |
1003 | * If start_hash is non-null, it will be filled in with the starting | |
1004 | * hash of the next page. | |
1005 | */ | |
617ba13b | 1006 | static int ext4_htree_next_block(struct inode *dir, __u32 hash, |
ac27a0ec DK |
1007 | struct dx_frame *frame, |
1008 | struct dx_frame *frames, | |
1009 | __u32 *start_hash) | |
1010 | { | |
1011 | struct dx_frame *p; | |
1012 | struct buffer_head *bh; | |
dc6982ff | 1013 | int num_frames = 0; |
ac27a0ec DK |
1014 | __u32 bhash; |
1015 | ||
1016 | p = frame; | |
1017 | /* | |
1018 | * Find the next leaf page by incrementing the frame pointer. | |
1019 | * If we run out of entries in the interior node, loop around and | |
1020 | * increment pointer in the parent node. When we break out of | |
1021 | * this loop, num_frames indicates the number of interior | |
1022 | * nodes need to be read. | |
1023 | */ | |
1024 | while (1) { | |
1025 | if (++(p->at) < p->entries + dx_get_count(p->entries)) | |
1026 | break; | |
1027 | if (p == frames) | |
1028 | return 0; | |
1029 | num_frames++; | |
1030 | p--; | |
1031 | } | |
1032 | ||
1033 | /* | |
1034 | * If the hash is 1, then continue only if the next page has a | |
1035 | * continuation hash of any value. This is used for readdir | |
1036 | * handling. Otherwise, check to see if the hash matches the | |
3088e5a5 | 1037 | * desired continuation hash. If it doesn't, return since |
ac27a0ec DK |
1038 | * there's no point to read in the successive index pages. |
1039 | */ | |
1040 | bhash = dx_get_hash(p->at); | |
1041 | if (start_hash) | |
1042 | *start_hash = bhash; | |
1043 | if ((hash & 1) == 0) { | |
1044 | if ((bhash & ~1) != hash) | |
1045 | return 0; | |
1046 | } | |
1047 | /* | |
1048 | * If the hash is HASH_NB_ALWAYS, we always go to the next | |
1049 | * block so no check is necessary | |
1050 | */ | |
1051 | while (num_frames--) { | |
dc6982ff TT |
1052 | bh = ext4_read_dirblock(dir, dx_get_block(p->at), INDEX); |
1053 | if (IS_ERR(bh)) | |
1054 | return PTR_ERR(bh); | |
ac27a0ec | 1055 | p++; |
af5bc92d | 1056 | brelse(p->bh); |
ac27a0ec DK |
1057 | p->bh = bh; |
1058 | p->at = p->entries = ((struct dx_node *) bh->b_data)->entries; | |
1059 | } | |
1060 | return 1; | |
1061 | } | |
1062 | ||
1063 | ||
ac27a0ec DK |
1064 | /* |
1065 | * This function fills a red-black tree with information from a | |
1066 | * directory block. It returns the number directory entries loaded | |
1067 | * into the tree. If there is an error it is returned in err. | |
1068 | */ | |
1069 | static int htree_dirblock_to_tree(struct file *dir_file, | |
725d26d3 | 1070 | struct inode *dir, ext4_lblk_t block, |
ac27a0ec DK |
1071 | struct dx_hash_info *hinfo, |
1072 | __u32 start_hash, __u32 start_minor_hash) | |
1073 | { | |
1074 | struct buffer_head *bh; | |
617ba13b | 1075 | struct ext4_dir_entry_2 *de, *top; |
90b0a973 | 1076 | int err = 0, count = 0; |
a7550b30 | 1077 | struct fscrypt_str fname_crypto_str = FSTR_INIT(NULL, 0), tmp_str; |
471fbbea | 1078 | int csum = ext4_has_metadata_csum(dir->i_sb); |
ac27a0ec | 1079 | |
725d26d3 AK |
1080 | dxtrace(printk(KERN_INFO "In htree dirblock_to_tree: block %lu\n", |
1081 | (unsigned long)block)); | |
4e19d6b6 | 1082 | bh = ext4_read_dirblock(dir, block, DIRENT_HTREE); |
dc6982ff TT |
1083 | if (IS_ERR(bh)) |
1084 | return PTR_ERR(bh); | |
b0336e8d | 1085 | |
617ba13b | 1086 | de = (struct ext4_dir_entry_2 *) bh->b_data; |
471fbbea | 1087 | /* csum entries are not larger in the casefolded encrypted case */ |
617ba13b | 1088 | top = (struct ext4_dir_entry_2 *) ((char *) de + |
ac27a0ec | 1089 | dir->i_sb->s_blocksize - |
471fbbea DR |
1090 | ext4_dir_rec_len(0, |
1091 | csum ? NULL : dir)); | |
1f3862b5 | 1092 | /* Check if the directory is encrypted */ |
592ddec7 | 1093 | if (IS_ENCRYPTED(dir)) { |
ec0caa97 | 1094 | err = fscrypt_prepare_readdir(dir); |
c936e1ec TT |
1095 | if (err < 0) { |
1096 | brelse(bh); | |
1097 | return err; | |
1098 | } | |
8b10fe68 JL |
1099 | err = fscrypt_fname_alloc_buffer(EXT4_NAME_LEN, |
1100 | &fname_crypto_str); | |
1f3862b5 | 1101 | if (err < 0) { |
1f3862b5 MH |
1102 | brelse(bh); |
1103 | return err; | |
1104 | } | |
1105 | } | |
64c314ff | 1106 | |
3d0518f4 | 1107 | for (; de < top; de = ext4_next_entry(de, dir->i_sb->s_blocksize)) { |
f7c21177 | 1108 | if (ext4_check_dir_entry(dir, NULL, de, bh, |
226ba972 | 1109 | bh->b_data, bh->b_size, |
cad3f007 TT |
1110 | (block<<EXT4_BLOCK_SIZE_BITS(dir->i_sb)) |
1111 | + ((char *)de - bh->b_data))) { | |
64cb9273 AV |
1112 | /* silently ignore the rest of the block */ |
1113 | break; | |
e6c40211 | 1114 | } |
471fbbea DR |
1115 | if (ext4_hash_in_dirent(dir)) { |
1116 | if (de->name_len && de->inode) { | |
1117 | hinfo->hash = EXT4_DIRENT_HASH(de); | |
1118 | hinfo->minor_hash = EXT4_DIRENT_MINOR_HASH(de); | |
1119 | } else { | |
1120 | hinfo->hash = 0; | |
1121 | hinfo->minor_hash = 0; | |
1122 | } | |
1123 | } else { | |
4b3cb1d1 TT |
1124 | err = ext4fs_dirhash(dir, de->name, |
1125 | de->name_len, hinfo); | |
1126 | if (err < 0) { | |
1127 | count = err; | |
1128 | goto errout; | |
1129 | } | |
471fbbea | 1130 | } |
ac27a0ec DK |
1131 | if ((hinfo->hash < start_hash) || |
1132 | ((hinfo->hash == start_hash) && | |
1133 | (hinfo->minor_hash < start_minor_hash))) | |
1134 | continue; | |
1135 | if (de->inode == 0) | |
1136 | continue; | |
592ddec7 | 1137 | if (!IS_ENCRYPTED(dir)) { |
1f3862b5 MH |
1138 | tmp_str.name = de->name; |
1139 | tmp_str.len = de->name_len; | |
1140 | err = ext4_htree_store_dirent(dir_file, | |
1141 | hinfo->hash, hinfo->minor_hash, de, | |
1142 | &tmp_str); | |
1143 | } else { | |
d2299590 | 1144 | int save_len = fname_crypto_str.len; |
a7550b30 JK |
1145 | struct fscrypt_str de_name = FSTR_INIT(de->name, |
1146 | de->name_len); | |
d2299590 | 1147 | |
1f3862b5 | 1148 | /* Directory is encrypted */ |
a7550b30 JK |
1149 | err = fscrypt_fname_disk_to_usr(dir, hinfo->hash, |
1150 | hinfo->minor_hash, &de_name, | |
1151 | &fname_crypto_str); | |
ef1eb3aa | 1152 | if (err) { |
1f3862b5 MH |
1153 | count = err; |
1154 | goto errout; | |
1155 | } | |
1156 | err = ext4_htree_store_dirent(dir_file, | |
1157 | hinfo->hash, hinfo->minor_hash, de, | |
1158 | &fname_crypto_str); | |
d2299590 | 1159 | fname_crypto_str.len = save_len; |
1f3862b5 | 1160 | } |
2f61830a | 1161 | if (err != 0) { |
1f3862b5 MH |
1162 | count = err; |
1163 | goto errout; | |
ac27a0ec DK |
1164 | } |
1165 | count++; | |
1166 | } | |
1f3862b5 | 1167 | errout: |
ac27a0ec | 1168 | brelse(bh); |
a7550b30 | 1169 | fscrypt_fname_free_buffer(&fname_crypto_str); |
ac27a0ec DK |
1170 | return count; |
1171 | } | |
1172 | ||
1173 | ||
1174 | /* | |
1175 | * This function fills a red-black tree with information from a | |
1176 | * directory. We start scanning the directory in hash order, starting | |
1177 | * at start_hash and start_minor_hash. | |
1178 | * | |
1179 | * This function returns the number of entries inserted into the tree, | |
1180 | * or a negative error code. | |
1181 | */ | |
617ba13b | 1182 | int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, |
ac27a0ec DK |
1183 | __u32 start_minor_hash, __u32 *next_hash) |
1184 | { | |
1185 | struct dx_hash_info hinfo; | |
617ba13b | 1186 | struct ext4_dir_entry_2 *de; |
e08ac99f | 1187 | struct dx_frame frames[EXT4_HTREE_LEVEL], *frame; |
ac27a0ec | 1188 | struct inode *dir; |
725d26d3 | 1189 | ext4_lblk_t block; |
ac27a0ec | 1190 | int count = 0; |
725d26d3 | 1191 | int ret, err; |
ac27a0ec | 1192 | __u32 hashval; |
a7550b30 | 1193 | struct fscrypt_str tmp_str; |
ac27a0ec | 1194 | |
60e6679e | 1195 | dxtrace(printk(KERN_DEBUG "In htree_fill_tree, start hash: %x:%x\n", |
4776004f | 1196 | start_hash, start_minor_hash)); |
496ad9aa | 1197 | dir = file_inode(dir_file); |
12e9b892 | 1198 | if (!(ext4_test_inode_flag(dir, EXT4_INODE_INDEX))) { |
471fbbea DR |
1199 | if (ext4_hash_in_dirent(dir)) |
1200 | hinfo.hash_version = DX_HASH_SIPHASH; | |
1201 | else | |
1202 | hinfo.hash_version = | |
1203 | EXT4_SB(dir->i_sb)->s_def_hash_version; | |
f99b2589 TT |
1204 | if (hinfo.hash_version <= DX_HASH_TEA) |
1205 | hinfo.hash_version += | |
1206 | EXT4_SB(dir->i_sb)->s_hash_unsigned; | |
617ba13b | 1207 | hinfo.seed = EXT4_SB(dir->i_sb)->s_hash_seed; |
8af0f082 TM |
1208 | if (ext4_has_inline_data(dir)) { |
1209 | int has_inline_data = 1; | |
7633b08b TT |
1210 | count = ext4_inlinedir_to_tree(dir_file, dir, 0, |
1211 | &hinfo, start_hash, | |
1212 | start_minor_hash, | |
1213 | &has_inline_data); | |
8af0f082 TM |
1214 | if (has_inline_data) { |
1215 | *next_hash = ~0; | |
1216 | return count; | |
1217 | } | |
1218 | } | |
ac27a0ec DK |
1219 | count = htree_dirblock_to_tree(dir_file, dir, 0, &hinfo, |
1220 | start_hash, start_minor_hash); | |
1221 | *next_hash = ~0; | |
1222 | return count; | |
1223 | } | |
1224 | hinfo.hash = start_hash; | |
1225 | hinfo.minor_hash = 0; | |
dd73b5d5 TT |
1226 | frame = dx_probe(NULL, dir, &hinfo, frames); |
1227 | if (IS_ERR(frame)) | |
1228 | return PTR_ERR(frame); | |
ac27a0ec DK |
1229 | |
1230 | /* Add '.' and '..' from the htree header */ | |
1231 | if (!start_hash && !start_minor_hash) { | |
617ba13b | 1232 | de = (struct ext4_dir_entry_2 *) frames[0].bh->b_data; |
2f61830a TT |
1233 | tmp_str.name = de->name; |
1234 | tmp_str.len = de->name_len; | |
1235 | err = ext4_htree_store_dirent(dir_file, 0, 0, | |
1236 | de, &tmp_str); | |
1237 | if (err != 0) | |
ac27a0ec DK |
1238 | goto errout; |
1239 | count++; | |
1240 | } | |
1241 | if (start_hash < 2 || (start_hash ==2 && start_minor_hash==0)) { | |
617ba13b | 1242 | de = (struct ext4_dir_entry_2 *) frames[0].bh->b_data; |
3d0518f4 | 1243 | de = ext4_next_entry(de, dir->i_sb->s_blocksize); |
2f61830a TT |
1244 | tmp_str.name = de->name; |
1245 | tmp_str.len = de->name_len; | |
1246 | err = ext4_htree_store_dirent(dir_file, 2, 0, | |
1247 | de, &tmp_str); | |
1248 | if (err != 0) | |
ac27a0ec DK |
1249 | goto errout; |
1250 | count++; | |
1251 | } | |
1252 | ||
1253 | while (1) { | |
1f60fbe7 TT |
1254 | if (fatal_signal_pending(current)) { |
1255 | err = -ERESTARTSYS; | |
1256 | goto errout; | |
1257 | } | |
1258 | cond_resched(); | |
ac27a0ec DK |
1259 | block = dx_get_block(frame->at); |
1260 | ret = htree_dirblock_to_tree(dir_file, dir, block, &hinfo, | |
1261 | start_hash, start_minor_hash); | |
1262 | if (ret < 0) { | |
1263 | err = ret; | |
1264 | goto errout; | |
1265 | } | |
1266 | count += ret; | |
1267 | hashval = ~0; | |
617ba13b | 1268 | ret = ext4_htree_next_block(dir, HASH_NB_ALWAYS, |
ac27a0ec DK |
1269 | frame, frames, &hashval); |
1270 | *next_hash = hashval; | |
1271 | if (ret < 0) { | |
1272 | err = ret; | |
1273 | goto errout; | |
1274 | } | |
1275 | /* | |
1276 | * Stop if: (a) there are no more entries, or | |
1277 | * (b) we have inserted at least one entry and the | |
1278 | * next hash value is not a continuation | |
1279 | */ | |
1280 | if ((ret == 0) || | |
1281 | (count && ((hashval & 1) == 0))) | |
1282 | break; | |
1283 | } | |
1284 | dx_release(frames); | |
4776004f TT |
1285 | dxtrace(printk(KERN_DEBUG "Fill tree: returned %d entries, " |
1286 | "next hash: %x\n", count, *next_hash)); | |
ac27a0ec DK |
1287 | return count; |
1288 | errout: | |
1289 | dx_release(frames); | |
1290 | return (err); | |
1291 | } | |
1292 | ||
7335cd3b TM |
1293 | static inline int search_dirblock(struct buffer_head *bh, |
1294 | struct inode *dir, | |
5b643f9c | 1295 | struct ext4_filename *fname, |
7335cd3b TM |
1296 | unsigned int offset, |
1297 | struct ext4_dir_entry_2 **res_dir) | |
1298 | { | |
5b643f9c | 1299 | return ext4_search_dir(bh, bh->b_data, dir->i_sb->s_blocksize, dir, |
d6b97550 | 1300 | fname, offset, res_dir); |
7335cd3b TM |
1301 | } |
1302 | ||
ac27a0ec DK |
1303 | /* |
1304 | * Directory block splitting, compacting | |
1305 | */ | |
1306 | ||
ef2b02d3 ES |
1307 | /* |
1308 | * Create map of hash values, offsets, and sizes, stored at end of block. | |
1309 | * Returns number of entries mapped. | |
1310 | */ | |
46c116b9 JK |
1311 | static int dx_make_map(struct inode *dir, struct buffer_head *bh, |
1312 | struct dx_hash_info *hinfo, | |
8bad4597 | 1313 | struct dx_map_entry *map_tail) |
ac27a0ec DK |
1314 | { |
1315 | int count = 0; | |
46c116b9 JK |
1316 | struct ext4_dir_entry_2 *de = (struct ext4_dir_entry_2 *)bh->b_data; |
1317 | unsigned int buflen = bh->b_size; | |
1318 | char *base = bh->b_data; | |
ac27a0ec | 1319 | struct dx_hash_info h = *hinfo; |
7fda67e8 | 1320 | int blocksize = EXT4_BLOCK_SIZE(dir->i_sb); |
ac27a0ec | 1321 | |
46c116b9 JK |
1322 | if (ext4_has_metadata_csum(dir->i_sb)) |
1323 | buflen -= sizeof(struct ext4_dir_entry_tail); | |
1324 | ||
1325 | while ((char *) de < base + buflen) { | |
1326 | if (ext4_check_dir_entry(dir, NULL, de, bh, base, buflen, | |
1327 | ((char *)de) - base)) | |
1328 | return -EFSCORRUPTED; | |
ac27a0ec | 1329 | if (de->name_len && de->inode) { |
471fbbea DR |
1330 | if (ext4_hash_in_dirent(dir)) |
1331 | h.hash = EXT4_DIRENT_HASH(de); | |
4b3cb1d1 TT |
1332 | else { |
1333 | int err = ext4fs_dirhash(dir, de->name, | |
1334 | de->name_len, &h); | |
1335 | if (err < 0) | |
1336 | return err; | |
1337 | } | |
ac27a0ec DK |
1338 | map_tail--; |
1339 | map_tail->hash = h.hash; | |
9aee2286 | 1340 | map_tail->offs = ((char *) de - base)>>2; |
7fda67e8 SZ |
1341 | map_tail->size = ext4_rec_len_from_disk(de->rec_len, |
1342 | blocksize); | |
ac27a0ec DK |
1343 | count++; |
1344 | cond_resched(); | |
1345 | } | |
7fda67e8 | 1346 | de = ext4_next_entry(de, blocksize); |
ac27a0ec DK |
1347 | } |
1348 | return count; | |
1349 | } | |
1350 | ||
ef2b02d3 | 1351 | /* Sort map by hash value */ |
ac27a0ec DK |
1352 | static void dx_sort_map (struct dx_map_entry *map, unsigned count) |
1353 | { | |
63f57933 AM |
1354 | struct dx_map_entry *p, *q, *top = map + count - 1; |
1355 | int more; | |
1356 | /* Combsort until bubble sort doesn't suck */ | |
1357 | while (count > 2) { | |
1358 | count = count*10/13; | |
1359 | if (count - 9 < 2) /* 9, 10 -> 11 */ | |
1360 | count = 11; | |
1361 | for (p = top, q = p - count; q >= map; p--, q--) | |
1362 | if (p->hash < q->hash) | |
1363 | swap(*p, *q); | |
1364 | } | |
1365 | /* Garden variety bubble sort */ | |
1366 | do { | |
1367 | more = 0; | |
1368 | q = top; | |
1369 | while (q-- > map) { | |
1370 | if (q[1].hash >= q[0].hash) | |
ac27a0ec | 1371 | continue; |
63f57933 AM |
1372 | swap(*(q+1), *q); |
1373 | more = 1; | |
ac27a0ec DK |
1374 | } |
1375 | } while(more); | |
1376 | } | |
1377 | ||
725d26d3 | 1378 | static void dx_insert_block(struct dx_frame *frame, u32 hash, ext4_lblk_t block) |
ac27a0ec DK |
1379 | { |
1380 | struct dx_entry *entries = frame->entries; | |
1381 | struct dx_entry *old = frame->at, *new = old + 1; | |
1382 | int count = dx_get_count(entries); | |
1383 | ||
837c23fb CX |
1384 | ASSERT(count < dx_get_limit(entries)); |
1385 | ASSERT(old < entries + count); | |
ac27a0ec DK |
1386 | memmove(new + 1, new, (char *)(entries + count) - (char *)(new)); |
1387 | dx_set_hash(new, hash); | |
1388 | dx_set_block(new, block); | |
1389 | dx_set_count(entries, count + 1); | |
1390 | } | |
ac27a0ec | 1391 | |
5298d4bf | 1392 | #if IS_ENABLED(CONFIG_UNICODE) |
b886ee3e GKB |
1393 | /* |
1394 | * Test whether a case-insensitive directory entry matches the filename | |
3ae72562 GKB |
1395 | * being searched for. If quick is set, assume the name being looked up |
1396 | * is already in the casefolded form. | |
b886ee3e GKB |
1397 | * |
1398 | * Returns: 0 if the directory entry matches, more than 0 if it | |
1399 | * doesn't match or less than zero on error. | |
1400 | */ | |
471fbbea DR |
1401 | static int ext4_ci_compare(const struct inode *parent, const struct qstr *name, |
1402 | u8 *de_name, size_t de_name_len, bool quick) | |
b886ee3e | 1403 | { |
f8f4acb6 DR |
1404 | const struct super_block *sb = parent->i_sb; |
1405 | const struct unicode_map *um = sb->s_encoding; | |
471fbbea DR |
1406 | struct fscrypt_str decrypted_name = FSTR_INIT(NULL, de_name_len); |
1407 | struct qstr entry = QSTR_INIT(de_name, de_name_len); | |
b886ee3e GKB |
1408 | int ret; |
1409 | ||
471fbbea DR |
1410 | if (IS_ENCRYPTED(parent)) { |
1411 | const struct fscrypt_str encrypted_name = | |
1412 | FSTR_INIT(de_name, de_name_len); | |
1413 | ||
1414 | decrypted_name.name = kmalloc(de_name_len, GFP_KERNEL); | |
1415 | if (!decrypted_name.name) | |
1416 | return -ENOMEM; | |
1417 | ret = fscrypt_fname_disk_to_usr(parent, 0, 0, &encrypted_name, | |
1418 | &decrypted_name); | |
1419 | if (ret < 0) | |
1420 | goto out; | |
1421 | entry.name = decrypted_name.name; | |
1422 | entry.len = decrypted_name.len; | |
1423 | } | |
1424 | ||
3ae72562 | 1425 | if (quick) |
471fbbea | 1426 | ret = utf8_strncasecmp_folded(um, name, &entry); |
3ae72562 | 1427 | else |
471fbbea | 1428 | ret = utf8_strncasecmp(um, name, &entry); |
b886ee3e GKB |
1429 | if (ret < 0) { |
1430 | /* Handle invalid character sequence as either an error | |
1431 | * or as an opaque byte sequence. | |
1432 | */ | |
f8f4acb6 | 1433 | if (sb_has_strict_encoding(sb)) |
471fbbea DR |
1434 | ret = -EINVAL; |
1435 | else if (name->len != entry.len) | |
1436 | ret = 1; | |
1437 | else | |
1438 | ret = !!memcmp(name->name, entry.name, entry.len); | |
b886ee3e | 1439 | } |
471fbbea DR |
1440 | out: |
1441 | kfree(decrypted_name.name); | |
b886ee3e GKB |
1442 | return ret; |
1443 | } | |
3ae72562 | 1444 | |
1ae98e29 DR |
1445 | int ext4_fname_setup_ci_filename(struct inode *dir, const struct qstr *iname, |
1446 | struct ext4_filename *name) | |
3ae72562 | 1447 | { |
1ae98e29 DR |
1448 | struct fscrypt_str *cf_name = &name->cf_name; |
1449 | struct dx_hash_info *hinfo = &name->hinfo; | |
96fcaf86 GKB |
1450 | int len; |
1451 | ||
b8142793 | 1452 | if (!IS_CASEFOLDED(dir) || |
63e7f128 | 1453 | (IS_ENCRYPTED(dir) && !fscrypt_has_encryption_key(dir))) { |
3ae72562 | 1454 | cf_name->name = NULL; |
1ae98e29 | 1455 | return 0; |
3ae72562 GKB |
1456 | } |
1457 | ||
1458 | cf_name->name = kmalloc(EXT4_NAME_LEN, GFP_NOFS); | |
1459 | if (!cf_name->name) | |
1ae98e29 | 1460 | return -ENOMEM; |
3ae72562 | 1461 | |
f8f4acb6 | 1462 | len = utf8_casefold(dir->i_sb->s_encoding, |
96fcaf86 GKB |
1463 | iname, cf_name->name, |
1464 | EXT4_NAME_LEN); | |
1465 | if (len <= 0) { | |
3ae72562 GKB |
1466 | kfree(cf_name->name); |
1467 | cf_name->name = NULL; | |
1468 | } | |
96fcaf86 | 1469 | cf_name->len = (unsigned) len; |
1ae98e29 DR |
1470 | if (!IS_ENCRYPTED(dir)) |
1471 | return 0; | |
96fcaf86 | 1472 | |
1ae98e29 DR |
1473 | hinfo->hash_version = DX_HASH_SIPHASH; |
1474 | hinfo->seed = NULL; | |
1475 | if (cf_name->name) | |
4b3cb1d1 | 1476 | return ext4fs_dirhash(dir, cf_name->name, cf_name->len, hinfo); |
1ae98e29 | 1477 | else |
4b3cb1d1 | 1478 | return ext4fs_dirhash(dir, iname->name, iname->len, hinfo); |
3ae72562 | 1479 | } |
b886ee3e GKB |
1480 | #endif |
1481 | ||
ac27a0ec | 1482 | /* |
d9b9f8d5 | 1483 | * Test whether a directory entry matches the filename being searched for. |
ac27a0ec | 1484 | * |
d9b9f8d5 | 1485 | * Return: %true if the directory entry matches, otherwise %false. |
ac27a0ec | 1486 | */ |
471fbbea | 1487 | static bool ext4_match(struct inode *parent, |
b886ee3e | 1488 | const struct ext4_filename *fname, |
471fbbea | 1489 | struct ext4_dir_entry_2 *de) |
ac27a0ec | 1490 | { |
067d1023 | 1491 | struct fscrypt_name f; |
1f3862b5 | 1492 | |
ac27a0ec | 1493 | if (!de->inode) |
d9b9f8d5 | 1494 | return false; |
1f3862b5 | 1495 | |
067d1023 EB |
1496 | f.usr_fname = fname->usr_fname; |
1497 | f.disk_name = fname->disk_name; | |
643fa961 | 1498 | #ifdef CONFIG_FS_ENCRYPTION |
067d1023 | 1499 | f.crypto_buf = fname->crypto_buf; |
1f3862b5 | 1500 | #endif |
b886ee3e | 1501 | |
5298d4bf | 1502 | #if IS_ENABLED(CONFIG_UNICODE) |
b8142793 | 1503 | if (IS_CASEFOLDED(parent) && |
63e7f128 | 1504 | (!IS_ENCRYPTED(parent) || fscrypt_has_encryption_key(parent))) { |
3ae72562 GKB |
1505 | if (fname->cf_name.name) { |
1506 | struct qstr cf = {.name = fname->cf_name.name, | |
1507 | .len = fname->cf_name.len}; | |
471fbbea | 1508 | if (IS_ENCRYPTED(parent)) { |
1ae98e29 DR |
1509 | if (fname->hinfo.hash != EXT4_DIRENT_HASH(de) || |
1510 | fname->hinfo.minor_hash != | |
1511 | EXT4_DIRENT_MINOR_HASH(de)) { | |
1512 | ||
d4ffeeb7 | 1513 | return false; |
1ae98e29 | 1514 | } |
471fbbea DR |
1515 | } |
1516 | return !ext4_ci_compare(parent, &cf, de->name, | |
1517 | de->name_len, true); | |
3ae72562 | 1518 | } |
471fbbea DR |
1519 | return !ext4_ci_compare(parent, fname->usr_fname, de->name, |
1520 | de->name_len, false); | |
3ae72562 | 1521 | } |
b886ee3e GKB |
1522 | #endif |
1523 | ||
067d1023 | 1524 | return fscrypt_match_name(&f, de->name, de->name_len); |
ac27a0ec DK |
1525 | } |
1526 | ||
1527 | /* | |
1528 | * Returns 0 if not found, -1 on failure, and 1 on success | |
1529 | */ | |
5b643f9c TT |
1530 | int ext4_search_dir(struct buffer_head *bh, char *search_buf, int buf_size, |
1531 | struct inode *dir, struct ext4_filename *fname, | |
5b643f9c | 1532 | unsigned int offset, struct ext4_dir_entry_2 **res_dir) |
ac27a0ec | 1533 | { |
617ba13b | 1534 | struct ext4_dir_entry_2 * de; |
ac27a0ec DK |
1535 | char * dlimit; |
1536 | int de_len; | |
1f3862b5 | 1537 | |
7335cd3b TM |
1538 | de = (struct ext4_dir_entry_2 *)search_buf; |
1539 | dlimit = search_buf + buf_size; | |
c186f088 | 1540 | while ((char *) de < dlimit - EXT4_BASE_DIR_LEN) { |
ac27a0ec DK |
1541 | /* this code is executed quadratically often */ |
1542 | /* do minimal checking `by hand' */ | |
c186f088 | 1543 | if (de->name + de->name_len <= dlimit && |
b886ee3e | 1544 | ext4_match(dir, fname, de)) { |
d9b9f8d5 EB |
1545 | /* found a match - just to be sure, do |
1546 | * a full check */ | |
7303cb5b JK |
1547 | if (ext4_check_dir_entry(dir, NULL, de, bh, search_buf, |
1548 | buf_size, offset)) | |
d9b9f8d5 EB |
1549 | return -1; |
1550 | *res_dir = de; | |
1551 | return 1; | |
ac27a0ec DK |
1552 | } |
1553 | /* prevent looping on a bad block */ | |
3d0518f4 WY |
1554 | de_len = ext4_rec_len_from_disk(de->rec_len, |
1555 | dir->i_sb->s_blocksize); | |
d9b9f8d5 EB |
1556 | if (de_len <= 0) |
1557 | return -1; | |
ac27a0ec | 1558 | offset += de_len; |
617ba13b | 1559 | de = (struct ext4_dir_entry_2 *) ((char *) de + de_len); |
ac27a0ec | 1560 | } |
d9b9f8d5 | 1561 | return 0; |
ac27a0ec DK |
1562 | } |
1563 | ||
c6af8803 DW |
1564 | static int is_dx_internal_node(struct inode *dir, ext4_lblk_t block, |
1565 | struct ext4_dir_entry *de) | |
1566 | { | |
1567 | struct super_block *sb = dir->i_sb; | |
1568 | ||
1569 | if (!is_dx(dir)) | |
1570 | return 0; | |
1571 | if (block == 0) | |
1572 | return 1; | |
1573 | if (de->inode == 0 && | |
1574 | ext4_rec_len_from_disk(de->rec_len, sb->s_blocksize) == | |
1575 | sb->s_blocksize) | |
1576 | return 1; | |
1577 | return 0; | |
1578 | } | |
ac27a0ec DK |
1579 | |
1580 | /* | |
b01531db | 1581 | * __ext4_find_entry() |
ac27a0ec DK |
1582 | * |
1583 | * finds an entry in the specified directory with the wanted name. It | |
1584 | * returns the cache buffer in which the entry was found, and the entry | |
1585 | * itself (as a parameter - res_dir). It does NOT read the inode of the | |
1586 | * entry - you'll have to do that yourself if you want to. | |
1587 | * | |
1588 | * The returned buffer_head has ->b_count elevated. The caller is expected | |
1589 | * to brelse() it when appropriate. | |
1590 | */ | |
b01531db EB |
1591 | static struct buffer_head *__ext4_find_entry(struct inode *dir, |
1592 | struct ext4_filename *fname, | |
1593 | struct ext4_dir_entry_2 **res_dir, | |
1594 | int *inlined) | |
ac27a0ec | 1595 | { |
af5bc92d TT |
1596 | struct super_block *sb; |
1597 | struct buffer_head *bh_use[NAMEI_RA_SIZE]; | |
1598 | struct buffer_head *bh, *ret = NULL; | |
9699d4f9 | 1599 | ext4_lblk_t start, block; |
b01531db | 1600 | const u8 *name = fname->usr_fname->name; |
9699d4f9 | 1601 | size_t ra_max = 0; /* Number of bh's in the readahead |
ac27a0ec | 1602 | buffer, bh_use[] */ |
9699d4f9 | 1603 | size_t ra_ptr = 0; /* Current index into readahead |
ac27a0ec | 1604 | buffer */ |
725d26d3 | 1605 | ext4_lblk_t nblocks; |
5b643f9c | 1606 | int i, namelen, retval; |
ac27a0ec DK |
1607 | |
1608 | *res_dir = NULL; | |
1609 | sb = dir->i_sb; | |
b01531db | 1610 | namelen = fname->usr_fname->len; |
617ba13b | 1611 | if (namelen > EXT4_NAME_LEN) |
ac27a0ec | 1612 | return NULL; |
e8e948e7 TM |
1613 | |
1614 | if (ext4_has_inline_data(dir)) { | |
1615 | int has_inline_data = 1; | |
b01531db | 1616 | ret = ext4_find_inline_entry(dir, fname, res_dir, |
e8e948e7 | 1617 | &has_inline_data); |
c9f62c8b EW |
1618 | if (inlined) |
1619 | *inlined = has_inline_data; | |
1620 | if (has_inline_data) | |
5b643f9c | 1621 | goto cleanup_and_exit; |
e8e948e7 TM |
1622 | } |
1623 | ||
8941ec8b | 1624 | if ((namelen <= 2) && (name[0] == '.') && |
6d5c3aa8 | 1625 | (name[1] == '.' || name[1] == '\0')) { |
8941ec8b TT |
1626 | /* |
1627 | * "." or ".." will only be in the first block | |
1628 | * NFS may look up ".."; "." should be handled by the VFS | |
1629 | */ | |
1630 | block = start = 0; | |
1631 | nblocks = 1; | |
1632 | goto restart; | |
1633 | } | |
ac27a0ec | 1634 | if (is_dx(dir)) { |
b01531db | 1635 | ret = ext4_dx_find_entry(dir, fname, res_dir); |
ac27a0ec DK |
1636 | /* |
1637 | * On success, or if the error was file not found, | |
1638 | * return. Otherwise, fall back to doing a search the | |
1639 | * old fashioned way. | |
1640 | */ | |
5b643f9c TT |
1641 | if (!IS_ERR(ret) || PTR_ERR(ret) != ERR_BAD_DX_DIR) |
1642 | goto cleanup_and_exit; | |
4776004f TT |
1643 | dxtrace(printk(KERN_DEBUG "ext4_find_entry: dx failed, " |
1644 | "falling back\n")); | |
f39b3f45 | 1645 | ret = NULL; |
ac27a0ec | 1646 | } |
617ba13b | 1647 | nblocks = dir->i_size >> EXT4_BLOCK_SIZE_BITS(sb); |
9d5afec6 CR |
1648 | if (!nblocks) { |
1649 | ret = NULL; | |
1650 | goto cleanup_and_exit; | |
1651 | } | |
617ba13b | 1652 | start = EXT4_I(dir)->i_dir_start_lookup; |
ac27a0ec DK |
1653 | if (start >= nblocks) |
1654 | start = 0; | |
1655 | block = start; | |
1656 | restart: | |
1657 | do { | |
1658 | /* | |
1659 | * We deal with the read-ahead logic here. | |
1660 | */ | |
9424ef56 | 1661 | cond_resched(); |
ac27a0ec DK |
1662 | if (ra_ptr >= ra_max) { |
1663 | /* Refill the readahead buffer */ | |
1664 | ra_ptr = 0; | |
9699d4f9 TE |
1665 | if (block < start) |
1666 | ra_max = start - block; | |
1667 | else | |
1668 | ra_max = nblocks - block; | |
1669 | ra_max = min(ra_max, ARRAY_SIZE(bh_use)); | |
1670 | retval = ext4_bread_batch(dir, block, ra_max, | |
1671 | false /* wait */, bh_use); | |
1672 | if (retval) { | |
1673 | ret = ERR_PTR(retval); | |
1674 | ra_max = 0; | |
1675 | goto cleanup_and_exit; | |
ac27a0ec DK |
1676 | } |
1677 | } | |
1678 | if ((bh = bh_use[ra_ptr++]) == NULL) | |
1679 | goto next; | |
1680 | wait_on_buffer(bh); | |
1681 | if (!buffer_uptodate(bh)) { | |
54d3adbc TT |
1682 | EXT4_ERROR_INODE_ERR(dir, EIO, |
1683 | "reading directory lblock %lu", | |
1684 | (unsigned long) block); | |
ac27a0ec | 1685 | brelse(bh); |
6febe6f2 KK |
1686 | ret = ERR_PTR(-EIO); |
1687 | goto cleanup_and_exit; | |
ac27a0ec | 1688 | } |
b0336e8d | 1689 | if (!buffer_verified(bh) && |
c6af8803 DW |
1690 | !is_dx_internal_node(dir, block, |
1691 | (struct ext4_dir_entry *)bh->b_data) && | |
f036adb3 | 1692 | !ext4_dirblock_csum_verify(dir, bh)) { |
54d3adbc TT |
1693 | EXT4_ERROR_INODE_ERR(dir, EFSBADCRC, |
1694 | "checksumming directory " | |
1695 | "block %lu", (unsigned long)block); | |
b0336e8d | 1696 | brelse(bh); |
bdddf342 TT |
1697 | ret = ERR_PTR(-EFSBADCRC); |
1698 | goto cleanup_and_exit; | |
b0336e8d DW |
1699 | } |
1700 | set_buffer_verified(bh); | |
b01531db | 1701 | i = search_dirblock(bh, dir, fname, |
617ba13b | 1702 | block << EXT4_BLOCK_SIZE_BITS(sb), res_dir); |
ac27a0ec | 1703 | if (i == 1) { |
617ba13b | 1704 | EXT4_I(dir)->i_dir_start_lookup = block; |
ac27a0ec DK |
1705 | ret = bh; |
1706 | goto cleanup_and_exit; | |
1707 | } else { | |
1708 | brelse(bh); | |
1709 | if (i < 0) | |
1710 | goto cleanup_and_exit; | |
1711 | } | |
1712 | next: | |
1713 | if (++block >= nblocks) | |
1714 | block = 0; | |
1715 | } while (block != start); | |
1716 | ||
1717 | /* | |
1718 | * If the directory has grown while we were searching, then | |
1719 | * search the last part of the directory before giving up. | |
1720 | */ | |
1721 | block = nblocks; | |
617ba13b | 1722 | nblocks = dir->i_size >> EXT4_BLOCK_SIZE_BITS(sb); |
ac27a0ec DK |
1723 | if (block < nblocks) { |
1724 | start = 0; | |
1725 | goto restart; | |
1726 | } | |
1727 | ||
1728 | cleanup_and_exit: | |
1729 | /* Clean up the read-ahead blocks */ | |
1730 | for (; ra_ptr < ra_max; ra_ptr++) | |
af5bc92d | 1731 | brelse(bh_use[ra_ptr]); |
ac27a0ec DK |
1732 | return ret; |
1733 | } | |
1734 | ||
b01531db EB |
1735 | static struct buffer_head *ext4_find_entry(struct inode *dir, |
1736 | const struct qstr *d_name, | |
1737 | struct ext4_dir_entry_2 **res_dir, | |
1738 | int *inlined) | |
1739 | { | |
1740 | int err; | |
1741 | struct ext4_filename fname; | |
1742 | struct buffer_head *bh; | |
1743 | ||
1744 | err = ext4_fname_setup_filename(dir, d_name, 1, &fname); | |
1745 | if (err == -ENOENT) | |
1746 | return NULL; | |
1747 | if (err) | |
1748 | return ERR_PTR(err); | |
1749 | ||
1750 | bh = __ext4_find_entry(dir, &fname, res_dir, inlined); | |
1751 | ||
1752 | ext4_fname_free_filename(&fname); | |
1753 | return bh; | |
1754 | } | |
1755 | ||
1756 | static struct buffer_head *ext4_lookup_entry(struct inode *dir, | |
1757 | struct dentry *dentry, | |
1758 | struct ext4_dir_entry_2 **res_dir) | |
1759 | { | |
1760 | int err; | |
1761 | struct ext4_filename fname; | |
1762 | struct buffer_head *bh; | |
1763 | ||
1764 | err = ext4_fname_prepare_lookup(dir, dentry, &fname); | |
bb9cd910 | 1765 | generic_set_encrypted_ci_d_ops(dentry); |
b01531db EB |
1766 | if (err == -ENOENT) |
1767 | return NULL; | |
1768 | if (err) | |
1769 | return ERR_PTR(err); | |
1770 | ||
1771 | bh = __ext4_find_entry(dir, &fname, res_dir, NULL); | |
1772 | ||
1773 | ext4_fname_free_filename(&fname); | |
1774 | return bh; | |
1775 | } | |
1776 | ||
5b643f9c TT |
1777 | static struct buffer_head * ext4_dx_find_entry(struct inode *dir, |
1778 | struct ext4_filename *fname, | |
1779 | struct ext4_dir_entry_2 **res_dir) | |
ac27a0ec | 1780 | { |
8941ec8b | 1781 | struct super_block * sb = dir->i_sb; |
e08ac99f | 1782 | struct dx_frame frames[EXT4_HTREE_LEVEL], *frame; |
ac27a0ec | 1783 | struct buffer_head *bh; |
725d26d3 | 1784 | ext4_lblk_t block; |
ac27a0ec | 1785 | int retval; |
ac27a0ec | 1786 | |
643fa961 | 1787 | #ifdef CONFIG_FS_ENCRYPTION |
1f3862b5 MH |
1788 | *res_dir = NULL; |
1789 | #endif | |
5b643f9c | 1790 | frame = dx_probe(fname, dir, NULL, frames); |
dd73b5d5 TT |
1791 | if (IS_ERR(frame)) |
1792 | return (struct buffer_head *) frame; | |
ac27a0ec DK |
1793 | do { |
1794 | block = dx_get_block(frame->at); | |
4e19d6b6 | 1795 | bh = ext4_read_dirblock(dir, block, DIRENT_HTREE); |
537d8f93 | 1796 | if (IS_ERR(bh)) |
b0336e8d | 1797 | goto errout; |
537d8f93 | 1798 | |
d6b97550 | 1799 | retval = search_dirblock(bh, dir, fname, |
7845c049 TT |
1800 | block << EXT4_BLOCK_SIZE_BITS(sb), |
1801 | res_dir); | |
537d8f93 TT |
1802 | if (retval == 1) |
1803 | goto success; | |
af5bc92d | 1804 | brelse(bh); |
7845c049 | 1805 | if (retval == -1) { |
537d8f93 | 1806 | bh = ERR_PTR(ERR_BAD_DX_DIR); |
7845c049 TT |
1807 | goto errout; |
1808 | } | |
1809 | ||
ac27a0ec | 1810 | /* Check to see if we should continue to search */ |
5b643f9c | 1811 | retval = ext4_htree_next_block(dir, fname->hinfo.hash, frame, |
ac27a0ec DK |
1812 | frames, NULL); |
1813 | if (retval < 0) { | |
b03a2f7e AD |
1814 | ext4_warning_inode(dir, |
1815 | "error %d reading directory index block", | |
1816 | retval); | |
537d8f93 | 1817 | bh = ERR_PTR(retval); |
ac27a0ec DK |
1818 | goto errout; |
1819 | } | |
1820 | } while (retval == 1); | |
1821 | ||
537d8f93 | 1822 | bh = NULL; |
ac27a0ec | 1823 | errout: |
d6b97550 | 1824 | dxtrace(printk(KERN_DEBUG "%s not found\n", fname->usr_fname->name)); |
537d8f93 TT |
1825 | success: |
1826 | dx_release(frames); | |
1827 | return bh; | |
ac27a0ec | 1828 | } |
ac27a0ec | 1829 | |
00cd8dd3 | 1830 | static struct dentry *ext4_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) |
ac27a0ec | 1831 | { |
af5bc92d TT |
1832 | struct inode *inode; |
1833 | struct ext4_dir_entry_2 *de; | |
1834 | struct buffer_head *bh; | |
28b4c263 | 1835 | |
89904275 EB |
1836 | if (dentry->d_name.len > EXT4_NAME_LEN) |
1837 | return ERR_PTR(-ENAMETOOLONG); | |
ac27a0ec | 1838 | |
b01531db | 1839 | bh = ext4_lookup_entry(dir, dentry, &de); |
36de9286 | 1840 | if (IS_ERR(bh)) |
e884bce1 | 1841 | return ERR_CAST(bh); |
ac27a0ec DK |
1842 | inode = NULL; |
1843 | if (bh) { | |
498e5f24 | 1844 | __u32 ino = le32_to_cpu(de->inode); |
af5bc92d | 1845 | brelse(bh); |
617ba13b | 1846 | if (!ext4_valid_inum(dir->i_sb, ino)) { |
24676da4 | 1847 | EXT4_ERROR_INODE(dir, "bad inode number: %u", ino); |
6a797d27 | 1848 | return ERR_PTR(-EFSCORRUPTED); |
a6c15c2b | 1849 | } |
7e936b73 | 1850 | if (unlikely(ino == dir->i_ino)) { |
a34e15cc DH |
1851 | EXT4_ERROR_INODE(dir, "'%pd' linked to parent dir", |
1852 | dentry); | |
6a797d27 | 1853 | return ERR_PTR(-EFSCORRUPTED); |
7e936b73 | 1854 | } |
8a363970 | 1855 | inode = ext4_iget(dir->i_sb, ino, EXT4_IGET_NORMAL); |
a9049376 AV |
1856 | if (inode == ERR_PTR(-ESTALE)) { |
1857 | EXT4_ERROR_INODE(dir, | |
1858 | "deleted inode referenced: %u", | |
1859 | ino); | |
6a797d27 | 1860 | return ERR_PTR(-EFSCORRUPTED); |
e6f009b0 | 1861 | } |
592ddec7 | 1862 | if (!IS_ERR(inode) && IS_ENCRYPTED(dir) && |
ff978b09 | 1863 | (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) && |
a7550b30 | 1864 | !fscrypt_has_permitted_context(dir, inode)) { |
d9cdc903 | 1865 | ext4_warning(inode->i_sb, |
8d2ae1cb | 1866 | "Inconsistent encryption contexts: %lu/%lu", |
8c68084b | 1867 | dir->i_ino, inode->i_ino); |
dd01b690 | 1868 | iput(inode); |
d9cdc903 TT |
1869 | return ERR_PTR(-EPERM); |
1870 | } | |
ac27a0ec | 1871 | } |
b886ee3e | 1872 | |
5298d4bf | 1873 | #if IS_ENABLED(CONFIG_UNICODE) |
b886ee3e GKB |
1874 | if (!inode && IS_CASEFOLDED(dir)) { |
1875 | /* Eventually we want to call d_add_ci(dentry, NULL) | |
1876 | * for negative dentries in the encoding case as | |
1877 | * well. For now, prevent the negative dentry | |
1878 | * from being cached. | |
1879 | */ | |
1880 | return NULL; | |
1881 | } | |
1882 | #endif | |
ac27a0ec DK |
1883 | return d_splice_alias(inode, dentry); |
1884 | } | |
1885 | ||
1886 | ||
617ba13b | 1887 | struct dentry *ext4_get_parent(struct dentry *child) |
ac27a0ec | 1888 | { |
498e5f24 | 1889 | __u32 ino; |
617ba13b | 1890 | struct ext4_dir_entry_2 * de; |
ac27a0ec DK |
1891 | struct buffer_head *bh; |
1892 | ||
80e5d1ff | 1893 | bh = ext4_find_entry(d_inode(child), &dotdot_name, &de, NULL); |
36de9286 | 1894 | if (IS_ERR(bh)) |
e884bce1 | 1895 | return ERR_CAST(bh); |
ac27a0ec DK |
1896 | if (!bh) |
1897 | return ERR_PTR(-ENOENT); | |
1898 | ino = le32_to_cpu(de->inode); | |
1899 | brelse(bh); | |
1900 | ||
fc64005c | 1901 | if (!ext4_valid_inum(child->d_sb, ino)) { |
2b0143b5 | 1902 | EXT4_ERROR_INODE(d_inode(child), |
24676da4 | 1903 | "bad parent inode number: %u", ino); |
6a797d27 | 1904 | return ERR_PTR(-EFSCORRUPTED); |
a6c15c2b VA |
1905 | } |
1906 | ||
8a363970 | 1907 | return d_obtain_alias(ext4_iget(child->d_sb, ino, EXT4_IGET_NORMAL)); |
ac27a0ec DK |
1908 | } |
1909 | ||
ef2b02d3 ES |
1910 | /* |
1911 | * Move count entries from end of map between two memory locations. | |
1912 | * Returns pointer to last entry moved. | |
1913 | */ | |
617ba13b | 1914 | static struct ext4_dir_entry_2 * |
471fbbea DR |
1915 | dx_move_dirents(struct inode *dir, char *from, char *to, |
1916 | struct dx_map_entry *map, int count, | |
3d0518f4 | 1917 | unsigned blocksize) |
ac27a0ec DK |
1918 | { |
1919 | unsigned rec_len = 0; | |
1920 | ||
1921 | while (count--) { | |
60e6679e | 1922 | struct ext4_dir_entry_2 *de = (struct ext4_dir_entry_2 *) |
9aee2286 | 1923 | (from + (map->offs<<2)); |
471fbbea DR |
1924 | rec_len = ext4_dir_rec_len(de->name_len, dir); |
1925 | ||
ac27a0ec | 1926 | memcpy (to, de, rec_len); |
617ba13b | 1927 | ((struct ext4_dir_entry_2 *) to)->rec_len = |
3d0518f4 | 1928 | ext4_rec_len_to_disk(rec_len, blocksize); |
6c091273 LR |
1929 | |
1930 | /* wipe dir_entry excluding the rec_len field */ | |
ac27a0ec | 1931 | de->inode = 0; |
6c091273 LR |
1932 | memset(&de->name_len, 0, ext4_rec_len_from_disk(de->rec_len, |
1933 | blocksize) - | |
1934 | offsetof(struct ext4_dir_entry_2, | |
1935 | name_len)); | |
1936 | ||
ac27a0ec DK |
1937 | map++; |
1938 | to += rec_len; | |
1939 | } | |
617ba13b | 1940 | return (struct ext4_dir_entry_2 *) (to - rec_len); |
ac27a0ec DK |
1941 | } |
1942 | ||
ef2b02d3 ES |
1943 | /* |
1944 | * Compact each dir entry in the range to the minimal rec_len. | |
1945 | * Returns pointer to last entry in range. | |
1946 | */ | |
471fbbea DR |
1947 | static struct ext4_dir_entry_2 *dx_pack_dirents(struct inode *dir, char *base, |
1948 | unsigned int blocksize) | |
ac27a0ec | 1949 | { |
617ba13b | 1950 | struct ext4_dir_entry_2 *next, *to, *prev, *de = (struct ext4_dir_entry_2 *) base; |
ac27a0ec DK |
1951 | unsigned rec_len = 0; |
1952 | ||
1953 | prev = to = de; | |
8bad4597 | 1954 | while ((char*)de < base + blocksize) { |
3d0518f4 | 1955 | next = ext4_next_entry(de, blocksize); |
ac27a0ec | 1956 | if (de->inode && de->name_len) { |
471fbbea | 1957 | rec_len = ext4_dir_rec_len(de->name_len, dir); |
ac27a0ec DK |
1958 | if (de > to) |
1959 | memmove(to, de, rec_len); | |
3d0518f4 | 1960 | to->rec_len = ext4_rec_len_to_disk(rec_len, blocksize); |
ac27a0ec | 1961 | prev = to; |
617ba13b | 1962 | to = (struct ext4_dir_entry_2 *) (((char *) to) + rec_len); |
ac27a0ec DK |
1963 | } |
1964 | de = next; | |
1965 | } | |
1966 | return prev; | |
1967 | } | |
1968 | ||
ef2b02d3 ES |
1969 | /* |
1970 | * Split a full leaf block to make room for a new dir entry. | |
1971 | * Allocate a new block, and move entries so that they are approx. equally full. | |
1972 | * Returns pointer to de in block into which the new entry will be inserted. | |
1973 | */ | |
617ba13b | 1974 | static struct ext4_dir_entry_2 *do_split(handle_t *handle, struct inode *dir, |
ac27a0ec | 1975 | struct buffer_head **bh,struct dx_frame *frame, |
f8b3b59d | 1976 | struct dx_hash_info *hinfo) |
ac27a0ec DK |
1977 | { |
1978 | unsigned blocksize = dir->i_sb->s_blocksize; | |
bc75a6eb DX |
1979 | unsigned continued; |
1980 | int count; | |
ac27a0ec | 1981 | struct buffer_head *bh2; |
725d26d3 | 1982 | ext4_lblk_t newblock; |
ac27a0ec DK |
1983 | u32 hash2; |
1984 | struct dx_map_entry *map; | |
1985 | char *data1 = (*bh)->b_data, *data2; | |
59e315b4 | 1986 | unsigned split, move, size; |
617ba13b | 1987 | struct ext4_dir_entry_2 *de = NULL, *de2; |
b0336e8d | 1988 | int csum_size = 0; |
59e315b4 | 1989 | int err = 0, i; |
ac27a0ec | 1990 | |
9aa5d32b | 1991 | if (ext4_has_metadata_csum(dir->i_sb)) |
b0336e8d DW |
1992 | csum_size = sizeof(struct ext4_dir_entry_tail); |
1993 | ||
0f70b406 TT |
1994 | bh2 = ext4_append(handle, dir, &newblock); |
1995 | if (IS_ERR(bh2)) { | |
ac27a0ec DK |
1996 | brelse(*bh); |
1997 | *bh = NULL; | |
f8b3b59d | 1998 | return (struct ext4_dir_entry_2 *) bh2; |
ac27a0ec DK |
1999 | } |
2000 | ||
2001 | BUFFER_TRACE(*bh, "get_write_access"); | |
188c299e JK |
2002 | err = ext4_journal_get_write_access(handle, dir->i_sb, *bh, |
2003 | EXT4_JTR_NONE); | |
fedee54d DM |
2004 | if (err) |
2005 | goto journal_error; | |
2006 | ||
ac27a0ec | 2007 | BUFFER_TRACE(frame->bh, "get_write_access"); |
188c299e JK |
2008 | err = ext4_journal_get_write_access(handle, dir->i_sb, frame->bh, |
2009 | EXT4_JTR_NONE); | |
ac27a0ec DK |
2010 | if (err) |
2011 | goto journal_error; | |
2012 | ||
2013 | data2 = bh2->b_data; | |
2014 | ||
2015 | /* create map in the end of data2 block */ | |
2016 | map = (struct dx_map_entry *) (data2 + blocksize); | |
46c116b9 JK |
2017 | count = dx_make_map(dir, *bh, hinfo, map); |
2018 | if (count < 0) { | |
2019 | err = count; | |
2020 | goto journal_error; | |
2021 | } | |
ac27a0ec | 2022 | map -= count; |
af5bc92d | 2023 | dx_sort_map(map, count); |
5872331b | 2024 | /* Ensure that neither split block is over half full */ |
ef2b02d3 ES |
2025 | size = 0; |
2026 | move = 0; | |
2027 | for (i = count-1; i >= 0; i--) { | |
2028 | /* is more than half of this entry in 2nd half of the block? */ | |
2029 | if (size + map[i].size/2 > blocksize/2) | |
2030 | break; | |
2031 | size += map[i].size; | |
2032 | move++; | |
2033 | } | |
5872331b ES |
2034 | /* |
2035 | * map index at which we will split | |
2036 | * | |
2037 | * If the sum of active entries didn't exceed half the block size, just | |
2038 | * split it in half by count; each resulting block will have at least | |
2039 | * half the space free. | |
2040 | */ | |
2041 | if (i > 0) | |
2042 | split = count - move; | |
2043 | else | |
2044 | split = count/2; | |
2045 | ||
ac27a0ec DK |
2046 | hash2 = map[split].hash; |
2047 | continued = hash2 == map[split - 1].hash; | |
725d26d3 AK |
2048 | dxtrace(printk(KERN_INFO "Split block %lu at %x, %i/%i\n", |
2049 | (unsigned long)dx_get_block(frame->at), | |
2050 | hash2, split, count-split)); | |
ac27a0ec DK |
2051 | |
2052 | /* Fancy dance to stay within two buffers */ | |
471fbbea | 2053 | de2 = dx_move_dirents(dir, data1, data2, map + split, count - split, |
1f3862b5 | 2054 | blocksize); |
471fbbea | 2055 | de = dx_pack_dirents(dir, data1, blocksize); |
b0336e8d DW |
2056 | de->rec_len = ext4_rec_len_to_disk(data1 + (blocksize - csum_size) - |
2057 | (char *) de, | |
3d0518f4 | 2058 | blocksize); |
b0336e8d DW |
2059 | de2->rec_len = ext4_rec_len_to_disk(data2 + (blocksize - csum_size) - |
2060 | (char *) de2, | |
3d0518f4 | 2061 | blocksize); |
b0336e8d | 2062 | if (csum_size) { |
ddce3b94 TT |
2063 | ext4_initialize_dirent_tail(*bh, blocksize); |
2064 | ext4_initialize_dirent_tail(bh2, blocksize); | |
b0336e8d DW |
2065 | } |
2066 | ||
b3098486 MH |
2067 | dxtrace(dx_show_leaf(dir, hinfo, (struct ext4_dir_entry_2 *) data1, |
2068 | blocksize, 1)); | |
2069 | dxtrace(dx_show_leaf(dir, hinfo, (struct ext4_dir_entry_2 *) data2, | |
2070 | blocksize, 1)); | |
ac27a0ec DK |
2071 | |
2072 | /* Which block gets the new entry? */ | |
f8b3b59d | 2073 | if (hinfo->hash >= hash2) { |
ac27a0ec DK |
2074 | swap(*bh, bh2); |
2075 | de = de2; | |
2076 | } | |
af5bc92d | 2077 | dx_insert_block(frame, hash2 + continued, newblock); |
f036adb3 | 2078 | err = ext4_handle_dirty_dirblock(handle, dir, bh2); |
ac27a0ec DK |
2079 | if (err) |
2080 | goto journal_error; | |
dbe89444 | 2081 | err = ext4_handle_dirty_dx_node(handle, dir, frame->bh); |
ac27a0ec DK |
2082 | if (err) |
2083 | goto journal_error; | |
af5bc92d TT |
2084 | brelse(bh2); |
2085 | dxtrace(dx_show_index("frame", frame->entries)); | |
ac27a0ec | 2086 | return de; |
fedee54d DM |
2087 | |
2088 | journal_error: | |
2089 | brelse(*bh); | |
2090 | brelse(bh2); | |
2091 | *bh = NULL; | |
2092 | ext4_std_error(dir->i_sb, err); | |
f8b3b59d | 2093 | return ERR_PTR(err); |
ac27a0ec | 2094 | } |
ac27a0ec | 2095 | |
978fef91 TM |
2096 | int ext4_find_dest_de(struct inode *dir, struct inode *inode, |
2097 | struct buffer_head *bh, | |
2098 | void *buf, int buf_size, | |
5b643f9c | 2099 | struct ext4_filename *fname, |
978fef91 TM |
2100 | struct ext4_dir_entry_2 **dest_de) |
2101 | { | |
2102 | struct ext4_dir_entry_2 *de; | |
471fbbea | 2103 | unsigned short reclen = ext4_dir_rec_len(fname_len(fname), dir); |
978fef91 TM |
2104 | int nlen, rlen; |
2105 | unsigned int offset = 0; | |
2106 | char *top; | |
1f3862b5 | 2107 | |
c30365b9 | 2108 | de = buf; |
978fef91 TM |
2109 | top = buf + buf_size - reclen; |
2110 | while ((char *) de <= top) { | |
2111 | if (ext4_check_dir_entry(dir, NULL, de, bh, | |
d9b9f8d5 EB |
2112 | buf, buf_size, offset)) |
2113 | return -EFSCORRUPTED; | |
b886ee3e | 2114 | if (ext4_match(dir, fname, de)) |
d9b9f8d5 | 2115 | return -EEXIST; |
471fbbea | 2116 | nlen = ext4_dir_rec_len(de->name_len, dir); |
978fef91 TM |
2117 | rlen = ext4_rec_len_from_disk(de->rec_len, buf_size); |
2118 | if ((de->inode ? rlen - nlen : rlen) >= reclen) | |
2119 | break; | |
2120 | de = (struct ext4_dir_entry_2 *)((char *)de + rlen); | |
2121 | offset += rlen; | |
2122 | } | |
1f3862b5 | 2123 | if ((char *) de > top) |
d9b9f8d5 EB |
2124 | return -ENOSPC; |
2125 | ||
2126 | *dest_de = de; | |
2127 | return 0; | |
978fef91 TM |
2128 | } |
2129 | ||
471fbbea DR |
2130 | void ext4_insert_dentry(struct inode *dir, |
2131 | struct inode *inode, | |
1bc0af60 EB |
2132 | struct ext4_dir_entry_2 *de, |
2133 | int buf_size, | |
2134 | struct ext4_filename *fname) | |
978fef91 TM |
2135 | { |
2136 | ||
2137 | int nlen, rlen; | |
2138 | ||
471fbbea | 2139 | nlen = ext4_dir_rec_len(de->name_len, dir); |
978fef91 TM |
2140 | rlen = ext4_rec_len_from_disk(de->rec_len, buf_size); |
2141 | if (de->inode) { | |
2142 | struct ext4_dir_entry_2 *de1 = | |
4bdfc873 | 2143 | (struct ext4_dir_entry_2 *)((char *)de + nlen); |
978fef91 TM |
2144 | de1->rec_len = ext4_rec_len_to_disk(rlen - nlen, buf_size); |
2145 | de->rec_len = ext4_rec_len_to_disk(nlen, buf_size); | |
2146 | de = de1; | |
2147 | } | |
2148 | de->file_type = EXT4_FT_UNKNOWN; | |
2149 | de->inode = cpu_to_le32(inode->i_ino); | |
2150 | ext4_set_de_type(inode->i_sb, de, inode->i_mode); | |
5b643f9c TT |
2151 | de->name_len = fname_len(fname); |
2152 | memcpy(de->name, fname_name(fname), fname_len(fname)); | |
471fbbea | 2153 | if (ext4_hash_in_dirent(dir)) { |
1ae98e29 | 2154 | struct dx_hash_info *hinfo = &fname->hinfo; |
471fbbea | 2155 | |
1ae98e29 | 2156 | EXT4_DIRENT_HASHES(de)->hash = cpu_to_le32(hinfo->hash); |
471fbbea | 2157 | EXT4_DIRENT_HASHES(de)->minor_hash = |
1ae98e29 | 2158 | cpu_to_le32(hinfo->minor_hash); |
471fbbea | 2159 | } |
978fef91 | 2160 | } |
4bdfc873 | 2161 | |
ac27a0ec DK |
2162 | /* |
2163 | * Add a new entry into a directory (leaf) block. If de is non-NULL, | |
2164 | * it points to a directory entry which is guaranteed to be large | |
2165 | * enough for new directory entry. If de is NULL, then | |
2166 | * add_dirent_to_buf will attempt search the directory block for | |
2167 | * space. It will return -ENOSPC if no space is available, and -EIO | |
2168 | * and -EEXIST if directory entry already exists. | |
ac27a0ec | 2169 | */ |
5b643f9c TT |
2170 | static int add_dirent_to_buf(handle_t *handle, struct ext4_filename *fname, |
2171 | struct inode *dir, | |
617ba13b | 2172 | struct inode *inode, struct ext4_dir_entry_2 *de, |
af5bc92d | 2173 | struct buffer_head *bh) |
ac27a0ec | 2174 | { |
3d0518f4 | 2175 | unsigned int blocksize = dir->i_sb->s_blocksize; |
b0336e8d | 2176 | int csum_size = 0; |
4209ae12 | 2177 | int err, err2; |
b0336e8d | 2178 | |
9aa5d32b | 2179 | if (ext4_has_metadata_csum(inode->i_sb)) |
b0336e8d | 2180 | csum_size = sizeof(struct ext4_dir_entry_tail); |
ac27a0ec | 2181 | |
ac27a0ec | 2182 | if (!de) { |
5b643f9c TT |
2183 | err = ext4_find_dest_de(dir, inode, bh, bh->b_data, |
2184 | blocksize - csum_size, fname, &de); | |
978fef91 TM |
2185 | if (err) |
2186 | return err; | |
ac27a0ec DK |
2187 | } |
2188 | BUFFER_TRACE(bh, "get_write_access"); | |
188c299e JK |
2189 | err = ext4_journal_get_write_access(handle, dir->i_sb, bh, |
2190 | EXT4_JTR_NONE); | |
ac27a0ec | 2191 | if (err) { |
617ba13b | 2192 | ext4_std_error(dir->i_sb, err); |
ac27a0ec DK |
2193 | return err; |
2194 | } | |
2195 | ||
1bc0af60 | 2196 | /* By now the buffer is marked for journaling */ |
471fbbea | 2197 | ext4_insert_dentry(dir, inode, de, blocksize, fname); |
978fef91 | 2198 | |
ac27a0ec DK |
2199 | /* |
2200 | * XXX shouldn't update any times until successful | |
2201 | * completion of syscall, but too many callers depend | |
2202 | * on this. | |
2203 | * | |
2204 | * XXX similarly, too many callers depend on | |
617ba13b | 2205 | * ext4_new_inode() setting the times, but error |
ac27a0ec DK |
2206 | * recovery deletes the inode, so the worst that can |
2207 | * happen is that the times are slightly out of date | |
2208 | * and/or different from the directory change time. | |
2209 | */ | |
1bc33893 | 2210 | dir->i_mtime = inode_set_ctime_current(dir); |
617ba13b | 2211 | ext4_update_dx_flag(dir); |
e08ac99f | 2212 | inode_inc_iversion(dir); |
4209ae12 | 2213 | err2 = ext4_mark_inode_dirty(handle, dir); |
0390131b | 2214 | BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata"); |
f036adb3 | 2215 | err = ext4_handle_dirty_dirblock(handle, dir, bh); |
ac27a0ec | 2216 | if (err) |
617ba13b | 2217 | ext4_std_error(dir->i_sb, err); |
4209ae12 | 2218 | return err ? err : err2; |
ac27a0ec DK |
2219 | } |
2220 | ||
ac27a0ec DK |
2221 | /* |
2222 | * This converts a one block unindexed directory to a 3 block indexed | |
2223 | * directory, and adds the dentry to the indexed directory. | |
2224 | */ | |
5b643f9c | 2225 | static int make_indexed_dir(handle_t *handle, struct ext4_filename *fname, |
56a04915 | 2226 | struct inode *dir, |
ac27a0ec DK |
2227 | struct inode *inode, struct buffer_head *bh) |
2228 | { | |
ac27a0ec DK |
2229 | struct buffer_head *bh2; |
2230 | struct dx_root *root; | |
e08ac99f | 2231 | struct dx_frame frames[EXT4_HTREE_LEVEL], *frame; |
ac27a0ec | 2232 | struct dx_entry *entries; |
617ba13b | 2233 | struct ext4_dir_entry_2 *de, *de2; |
ddce3b94 | 2234 | char *data2, *top; |
ac27a0ec DK |
2235 | unsigned len; |
2236 | int retval; | |
2237 | unsigned blocksize; | |
725d26d3 | 2238 | ext4_lblk_t block; |
ac27a0ec | 2239 | struct fake_dirent *fde; |
4bdfc873 MH |
2240 | int csum_size = 0; |
2241 | ||
9aa5d32b | 2242 | if (ext4_has_metadata_csum(inode->i_sb)) |
b0336e8d | 2243 | csum_size = sizeof(struct ext4_dir_entry_tail); |
ac27a0ec DK |
2244 | |
2245 | blocksize = dir->i_sb->s_blocksize; | |
e6b8bc09 | 2246 | dxtrace(printk(KERN_DEBUG "Creating index: inode %lu\n", dir->i_ino)); |
5d601255 | 2247 | BUFFER_TRACE(bh, "get_write_access"); |
188c299e JK |
2248 | retval = ext4_journal_get_write_access(handle, dir->i_sb, bh, |
2249 | EXT4_JTR_NONE); | |
ac27a0ec | 2250 | if (retval) { |
617ba13b | 2251 | ext4_std_error(dir->i_sb, retval); |
ac27a0ec DK |
2252 | brelse(bh); |
2253 | return retval; | |
2254 | } | |
2255 | root = (struct dx_root *) bh->b_data; | |
2256 | ||
e6b8bc09 TT |
2257 | /* The 0th block becomes the root, move the dirents out */ |
2258 | fde = &root->dotdot; | |
2259 | de = (struct ext4_dir_entry_2 *)((char *)fde + | |
3d0518f4 | 2260 | ext4_rec_len_from_disk(fde->rec_len, blocksize)); |
e6b8bc09 | 2261 | if ((char *) de >= (((char *) root) + blocksize)) { |
24676da4 | 2262 | EXT4_ERROR_INODE(dir, "invalid rec_len for '..'"); |
e6b8bc09 | 2263 | brelse(bh); |
6a797d27 | 2264 | return -EFSCORRUPTED; |
e6b8bc09 | 2265 | } |
b0336e8d | 2266 | len = ((char *) root) + (blocksize - csum_size) - (char *) de; |
e6b8bc09 TT |
2267 | |
2268 | /* Allocate new block for the 0th block's dirents */ | |
0f70b406 TT |
2269 | bh2 = ext4_append(handle, dir, &block); |
2270 | if (IS_ERR(bh2)) { | |
ac27a0ec | 2271 | brelse(bh); |
0f70b406 | 2272 | return PTR_ERR(bh2); |
ac27a0ec | 2273 | } |
12e9b892 | 2274 | ext4_set_inode_flag(dir, EXT4_INODE_INDEX); |
ddce3b94 | 2275 | data2 = bh2->b_data; |
ac27a0ec | 2276 | |
ddce3b94 | 2277 | memcpy(data2, de, len); |
6c091273 | 2278 | memset(de, 0, len); /* wipe old data */ |
ddce3b94 TT |
2279 | de = (struct ext4_dir_entry_2 *) data2; |
2280 | top = data2 + len; | |
17a0bc9b LH |
2281 | while ((char *)(de2 = ext4_next_entry(de, blocksize)) < top) { |
2282 | if (ext4_check_dir_entry(dir, NULL, de, bh2, data2, len, | |
2283 | (data2 + (blocksize - csum_size) - | |
2284 | (char *) de))) { | |
2285 | brelse(bh2); | |
2286 | brelse(bh); | |
2287 | return -EFSCORRUPTED; | |
2288 | } | |
ac27a0ec | 2289 | de = de2; |
17a0bc9b | 2290 | } |
ddce3b94 TT |
2291 | de->rec_len = ext4_rec_len_to_disk(data2 + (blocksize - csum_size) - |
2292 | (char *) de, blocksize); | |
b0336e8d | 2293 | |
ddce3b94 TT |
2294 | if (csum_size) |
2295 | ext4_initialize_dirent_tail(bh2, blocksize); | |
b0336e8d | 2296 | |
ac27a0ec | 2297 | /* Initialize the root; the dot dirents already exist */ |
617ba13b | 2298 | de = (struct ext4_dir_entry_2 *) (&root->dotdot); |
471fbbea DR |
2299 | de->rec_len = ext4_rec_len_to_disk( |
2300 | blocksize - ext4_dir_rec_len(2, NULL), blocksize); | |
ac27a0ec DK |
2301 | memset (&root->info, 0, sizeof(root->info)); |
2302 | root->info.info_length = sizeof(root->info); | |
471fbbea DR |
2303 | if (ext4_hash_in_dirent(dir)) |
2304 | root->info.hash_version = DX_HASH_SIPHASH; | |
2305 | else | |
2306 | root->info.hash_version = | |
2307 | EXT4_SB(dir->i_sb)->s_def_hash_version; | |
2308 | ||
ac27a0ec | 2309 | entries = root->entries; |
af5bc92d TT |
2310 | dx_set_block(entries, 1); |
2311 | dx_set_count(entries, 1); | |
2312 | dx_set_limit(entries, dx_root_limit(dir, sizeof(root->info))); | |
ac27a0ec DK |
2313 | |
2314 | /* Initialize as for dx_probe */ | |
5b643f9c TT |
2315 | fname->hinfo.hash_version = root->info.hash_version; |
2316 | if (fname->hinfo.hash_version <= DX_HASH_TEA) | |
2317 | fname->hinfo.hash_version += EXT4_SB(dir->i_sb)->s_hash_unsigned; | |
2318 | fname->hinfo.seed = EXT4_SB(dir->i_sb)->s_hash_seed; | |
1ae98e29 DR |
2319 | |
2320 | /* casefolded encrypted hashes are computed on fname setup */ | |
4b3cb1d1 TT |
2321 | if (!ext4_hash_in_dirent(dir)) { |
2322 | int err = ext4fs_dirhash(dir, fname_name(fname), | |
2323 | fname_len(fname), &fname->hinfo); | |
2324 | if (err < 0) { | |
2325 | brelse(bh2); | |
2326 | brelse(bh); | |
2327 | return err; | |
2328 | } | |
2329 | } | |
6050d47a | 2330 | memset(frames, 0, sizeof(frames)); |
ac27a0ec DK |
2331 | frame = frames; |
2332 | frame->entries = entries; | |
2333 | frame->at = entries; | |
2334 | frame->bh = bh; | |
6976a6f2 | 2335 | |
6050d47a JK |
2336 | retval = ext4_handle_dirty_dx_node(handle, dir, frame->bh); |
2337 | if (retval) | |
666245d9 | 2338 | goto out_frames; |
f036adb3 | 2339 | retval = ext4_handle_dirty_dirblock(handle, dir, bh2); |
6050d47a | 2340 | if (retval) |
666245d9 | 2341 | goto out_frames; |
6976a6f2 | 2342 | |
e81d4477 | 2343 | de = do_split(handle,dir, &bh2, frame, &fname->hinfo); |
f8b3b59d | 2344 | if (IS_ERR(de)) { |
6050d47a JK |
2345 | retval = PTR_ERR(de); |
2346 | goto out_frames; | |
7ad8e4e6 | 2347 | } |
ac27a0ec | 2348 | |
e81d4477 | 2349 | retval = add_dirent_to_buf(handle, fname, dir, inode, de, bh2); |
6050d47a JK |
2350 | out_frames: |
2351 | /* | |
2352 | * Even if the block split failed, we have to properly write | |
2353 | * out all the changes we did so far. Otherwise we can end up | |
2354 | * with corrupted filesystem. | |
2355 | */ | |
e81d4477 | 2356 | if (retval) |
2357 | ext4_mark_inode_dirty(handle, dir); | |
6050d47a | 2358 | dx_release(frames); |
e81d4477 | 2359 | brelse(bh2); |
6050d47a | 2360 | return retval; |
ac27a0ec | 2361 | } |
ac27a0ec DK |
2362 | |
2363 | /* | |
617ba13b | 2364 | * ext4_add_entry() |
ac27a0ec DK |
2365 | * |
2366 | * adds a file entry to the specified directory, using the same | |
617ba13b | 2367 | * semantics as ext4_find_entry(). It returns NULL if it failed. |
ac27a0ec DK |
2368 | * |
2369 | * NOTE!! The inode part of 'de' is left at 0 - which means you | |
2370 | * may not sleep between calling this and putting something into | |
2371 | * the entry, as someone else might have used it while you slept. | |
2372 | */ | |
af5bc92d TT |
2373 | static int ext4_add_entry(handle_t *handle, struct dentry *dentry, |
2374 | struct inode *inode) | |
ac27a0ec | 2375 | { |
2b0143b5 | 2376 | struct inode *dir = d_inode(dentry->d_parent); |
e12fb972 | 2377 | struct buffer_head *bh = NULL; |
617ba13b | 2378 | struct ext4_dir_entry_2 *de; |
af5bc92d | 2379 | struct super_block *sb; |
5b643f9c | 2380 | struct ext4_filename fname; |
ac27a0ec | 2381 | int retval; |
ac27a0ec | 2382 | int dx_fallback=0; |
ac27a0ec | 2383 | unsigned blocksize; |
725d26d3 | 2384 | ext4_lblk_t block, blocks; |
b0336e8d DW |
2385 | int csum_size = 0; |
2386 | ||
9aa5d32b | 2387 | if (ext4_has_metadata_csum(inode->i_sb)) |
b0336e8d | 2388 | csum_size = sizeof(struct ext4_dir_entry_tail); |
ac27a0ec DK |
2389 | |
2390 | sb = dir->i_sb; | |
2391 | blocksize = sb->s_blocksize; | |
2392 | if (!dentry->d_name.len) | |
2393 | return -EINVAL; | |
3c47d541 | 2394 | |
75d18cd1 EB |
2395 | if (fscrypt_is_nokey_name(dentry)) |
2396 | return -ENOKEY; | |
2397 | ||
5298d4bf | 2398 | #if IS_ENABLED(CONFIG_UNICODE) |
f8f4acb6 | 2399 | if (sb_has_strict_encoding(sb) && IS_CASEFOLDED(dir) && |
b8142793 | 2400 | utf8_validate(sb->s_encoding, &dentry->d_name)) |
b886ee3e GKB |
2401 | return -EINVAL; |
2402 | #endif | |
2403 | ||
5b643f9c TT |
2404 | retval = ext4_fname_setup_filename(dir, &dentry->d_name, 0, &fname); |
2405 | if (retval) | |
2406 | return retval; | |
2407 | ||
3c47d541 | 2408 | if (ext4_has_inline_data(dir)) { |
56a04915 | 2409 | retval = ext4_try_add_inline_entry(handle, &fname, dir, inode); |
3c47d541 | 2410 | if (retval < 0) |
5b643f9c | 2411 | goto out; |
3c47d541 TM |
2412 | if (retval == 1) { |
2413 | retval = 0; | |
e12fb972 | 2414 | goto out; |
3c47d541 TM |
2415 | } |
2416 | } | |
2417 | ||
ac27a0ec | 2418 | if (is_dx(dir)) { |
56a04915 | 2419 | retval = ext4_dx_add_entry(handle, &fname, dir, inode); |
ac27a0ec | 2420 | if (!retval || (retval != ERR_BAD_DX_DIR)) |
e12fb972 | 2421 | goto out; |
48a34311 JK |
2422 | /* Can we just ignore htree data? */ |
2423 | if (ext4_has_metadata_csum(sb)) { | |
2424 | EXT4_ERROR_INODE(dir, | |
2425 | "Directory has corrupted htree index."); | |
2426 | retval = -EFSCORRUPTED; | |
2427 | goto out; | |
2428 | } | |
12e9b892 | 2429 | ext4_clear_inode_flag(dir, EXT4_INODE_INDEX); |
ac27a0ec | 2430 | dx_fallback++; |
4209ae12 HS |
2431 | retval = ext4_mark_inode_dirty(handle, dir); |
2432 | if (unlikely(retval)) | |
2433 | goto out; | |
ac27a0ec | 2434 | } |
ac27a0ec | 2435 | blocks = dir->i_size >> sb->s_blocksize_bits; |
498e5f24 | 2436 | for (block = 0; block < blocks; block++) { |
dc6982ff | 2437 | bh = ext4_read_dirblock(dir, block, DIRENT); |
4e19d6b6 TT |
2438 | if (bh == NULL) { |
2439 | bh = ext4_bread(handle, dir, block, | |
2440 | EXT4_GET_BLOCKS_CREATE); | |
2441 | goto add_to_new_block; | |
2442 | } | |
5b643f9c TT |
2443 | if (IS_ERR(bh)) { |
2444 | retval = PTR_ERR(bh); | |
2445 | bh = NULL; | |
2446 | goto out; | |
2447 | } | |
2448 | retval = add_dirent_to_buf(handle, &fname, dir, inode, | |
2449 | NULL, bh); | |
e12fb972 LC |
2450 | if (retval != -ENOSPC) |
2451 | goto out; | |
ac27a0ec | 2452 | |
ac27a0ec | 2453 | if (blocks == 1 && !dx_fallback && |
e2b911c5 | 2454 | ext4_has_feature_dir_index(sb)) { |
56a04915 | 2455 | retval = make_indexed_dir(handle, &fname, dir, |
5b643f9c | 2456 | inode, bh); |
e12fb972 LC |
2457 | bh = NULL; /* make_indexed_dir releases bh */ |
2458 | goto out; | |
2459 | } | |
ac27a0ec DK |
2460 | brelse(bh); |
2461 | } | |
0f70b406 | 2462 | bh = ext4_append(handle, dir, &block); |
4e19d6b6 | 2463 | add_to_new_block: |
5b643f9c TT |
2464 | if (IS_ERR(bh)) { |
2465 | retval = PTR_ERR(bh); | |
2466 | bh = NULL; | |
2467 | goto out; | |
2468 | } | |
617ba13b | 2469 | de = (struct ext4_dir_entry_2 *) bh->b_data; |
ac27a0ec | 2470 | de->inode = 0; |
b0336e8d DW |
2471 | de->rec_len = ext4_rec_len_to_disk(blocksize - csum_size, blocksize); |
2472 | ||
ddce3b94 TT |
2473 | if (csum_size) |
2474 | ext4_initialize_dirent_tail(bh, blocksize); | |
b0336e8d | 2475 | |
5b643f9c | 2476 | retval = add_dirent_to_buf(handle, &fname, dir, inode, de, bh); |
e12fb972 | 2477 | out: |
5b643f9c | 2478 | ext4_fname_free_filename(&fname); |
2de770a4 | 2479 | brelse(bh); |
14ece102 FM |
2480 | if (retval == 0) |
2481 | ext4_set_inode_state(inode, EXT4_STATE_NEWENTRY); | |
2de770a4 | 2482 | return retval; |
ac27a0ec DK |
2483 | } |
2484 | ||
ac27a0ec DK |
2485 | /* |
2486 | * Returns 0 for success, or a negative error value | |
2487 | */ | |
5b643f9c | 2488 | static int ext4_dx_add_entry(handle_t *handle, struct ext4_filename *fname, |
56a04915 | 2489 | struct inode *dir, struct inode *inode) |
ac27a0ec | 2490 | { |
e08ac99f | 2491 | struct dx_frame frames[EXT4_HTREE_LEVEL], *frame; |
ac27a0ec | 2492 | struct dx_entry *entries, *at; |
af5bc92d | 2493 | struct buffer_head *bh; |
af5bc92d | 2494 | struct super_block *sb = dir->i_sb; |
617ba13b | 2495 | struct ext4_dir_entry_2 *de; |
e08ac99f | 2496 | int restart; |
ac27a0ec DK |
2497 | int err; |
2498 | ||
e08ac99f AB |
2499 | again: |
2500 | restart = 0; | |
5b643f9c | 2501 | frame = dx_probe(fname, dir, NULL, frames); |
dd73b5d5 TT |
2502 | if (IS_ERR(frame)) |
2503 | return PTR_ERR(frame); | |
ac27a0ec DK |
2504 | entries = frame->entries; |
2505 | at = frame->at; | |
4e19d6b6 | 2506 | bh = ext4_read_dirblock(dir, dx_get_block(frame->at), DIRENT_HTREE); |
dc6982ff TT |
2507 | if (IS_ERR(bh)) { |
2508 | err = PTR_ERR(bh); | |
2509 | bh = NULL; | |
ac27a0ec | 2510 | goto cleanup; |
6d1ab10e | 2511 | } |
ac27a0ec DK |
2512 | |
2513 | BUFFER_TRACE(bh, "get_write_access"); | |
188c299e | 2514 | err = ext4_journal_get_write_access(handle, sb, bh, EXT4_JTR_NONE); |
ac27a0ec DK |
2515 | if (err) |
2516 | goto journal_error; | |
2517 | ||
5b643f9c | 2518 | err = add_dirent_to_buf(handle, fname, dir, inode, NULL, bh); |
2de770a4 | 2519 | if (err != -ENOSPC) |
ac27a0ec | 2520 | goto cleanup; |
ac27a0ec | 2521 | |
e08ac99f | 2522 | err = 0; |
ac27a0ec | 2523 | /* Block full, should compress but for now just split */ |
4776004f | 2524 | dxtrace(printk(KERN_DEBUG "using %u of %u node entries\n", |
ac27a0ec DK |
2525 | dx_get_count(entries), dx_get_limit(entries))); |
2526 | /* Need to split index? */ | |
2527 | if (dx_get_count(entries) == dx_get_limit(entries)) { | |
725d26d3 | 2528 | ext4_lblk_t newblock; |
e08ac99f AB |
2529 | int levels = frame - frames + 1; |
2530 | unsigned int icount; | |
2531 | int add_level = 1; | |
ac27a0ec DK |
2532 | struct dx_entry *entries2; |
2533 | struct dx_node *node2; | |
2534 | struct buffer_head *bh2; | |
2535 | ||
e08ac99f AB |
2536 | while (frame > frames) { |
2537 | if (dx_get_count((frame - 1)->entries) < | |
2538 | dx_get_limit((frame - 1)->entries)) { | |
2539 | add_level = 0; | |
2540 | break; | |
2541 | } | |
2542 | frame--; /* split higher index block */ | |
2543 | at = frame->at; | |
2544 | entries = frame->entries; | |
2545 | restart = 1; | |
2546 | } | |
2547 | if (add_level && levels == ext4_dir_htree_level(sb)) { | |
2548 | ext4_warning(sb, "Directory (ino: %lu) index full, " | |
2549 | "reach max htree level :%d", | |
2550 | dir->i_ino, levels); | |
2551 | if (ext4_dir_htree_level(sb) < EXT4_HTREE_LEVEL) { | |
2552 | ext4_warning(sb, "Large directory feature is " | |
2553 | "not enabled on this " | |
2554 | "filesystem"); | |
2555 | } | |
ac27a0ec DK |
2556 | err = -ENOSPC; |
2557 | goto cleanup; | |
2558 | } | |
e08ac99f | 2559 | icount = dx_get_count(entries); |
0f70b406 TT |
2560 | bh2 = ext4_append(handle, dir, &newblock); |
2561 | if (IS_ERR(bh2)) { | |
2562 | err = PTR_ERR(bh2); | |
ac27a0ec | 2563 | goto cleanup; |
0f70b406 | 2564 | } |
ac27a0ec DK |
2565 | node2 = (struct dx_node *)(bh2->b_data); |
2566 | entries2 = node2->entries; | |
1f7bebb9 | 2567 | memset(&node2->fake, 0, sizeof(struct fake_dirent)); |
3d0518f4 WY |
2568 | node2->fake.rec_len = ext4_rec_len_to_disk(sb->s_blocksize, |
2569 | sb->s_blocksize); | |
ac27a0ec | 2570 | BUFFER_TRACE(frame->bh, "get_write_access"); |
188c299e JK |
2571 | err = ext4_journal_get_write_access(handle, sb, frame->bh, |
2572 | EXT4_JTR_NONE); | |
ac27a0ec DK |
2573 | if (err) |
2574 | goto journal_error; | |
e08ac99f | 2575 | if (!add_level) { |
ac27a0ec DK |
2576 | unsigned icount1 = icount/2, icount2 = icount - icount1; |
2577 | unsigned hash2 = dx_get_hash(entries + icount1); | |
4776004f TT |
2578 | dxtrace(printk(KERN_DEBUG "Split index %i/%i\n", |
2579 | icount1, icount2)); | |
ac27a0ec DK |
2580 | |
2581 | BUFFER_TRACE(frame->bh, "get_write_access"); /* index root */ | |
188c299e JK |
2582 | err = ext4_journal_get_write_access(handle, sb, |
2583 | (frame - 1)->bh, | |
2584 | EXT4_JTR_NONE); | |
ac27a0ec DK |
2585 | if (err) |
2586 | goto journal_error; | |
2587 | ||
af5bc92d TT |
2588 | memcpy((char *) entries2, (char *) (entries + icount1), |
2589 | icount2 * sizeof(struct dx_entry)); | |
2590 | dx_set_count(entries, icount1); | |
2591 | dx_set_count(entries2, icount2); | |
2592 | dx_set_limit(entries2, dx_node_limit(dir)); | |
ac27a0ec DK |
2593 | |
2594 | /* Which index block gets the new entry? */ | |
2595 | if (at - entries >= icount1) { | |
b2d2e757 | 2596 | frame->at = at - entries - icount1 + entries2; |
ac27a0ec DK |
2597 | frame->entries = entries = entries2; |
2598 | swap(frame->bh, bh2); | |
2599 | } | |
e08ac99f AB |
2600 | dx_insert_block((frame - 1), hash2, newblock); |
2601 | dxtrace(dx_show_index("node", frame->entries)); | |
af5bc92d | 2602 | dxtrace(dx_show_index("node", |
ac27a0ec | 2603 | ((struct dx_node *) bh2->b_data)->entries)); |
dbe89444 | 2604 | err = ext4_handle_dirty_dx_node(handle, dir, bh2); |
ac27a0ec DK |
2605 | if (err) |
2606 | goto journal_error; | |
2607 | brelse (bh2); | |
e08ac99f AB |
2608 | err = ext4_handle_dirty_dx_node(handle, dir, |
2609 | (frame - 1)->bh); | |
2610 | if (err) | |
2611 | goto journal_error; | |
b5776e75 TT |
2612 | err = ext4_handle_dirty_dx_node(handle, dir, |
2613 | frame->bh); | |
877ba3f7 | 2614 | if (restart || err) |
e08ac99f | 2615 | goto journal_error; |
ac27a0ec | 2616 | } else { |
e08ac99f | 2617 | struct dx_root *dxroot; |
ac27a0ec DK |
2618 | memcpy((char *) entries2, (char *) entries, |
2619 | icount * sizeof(struct dx_entry)); | |
2620 | dx_set_limit(entries2, dx_node_limit(dir)); | |
2621 | ||
2622 | /* Set up root */ | |
2623 | dx_set_count(entries, 1); | |
2624 | dx_set_block(entries + 0, newblock); | |
e08ac99f AB |
2625 | dxroot = (struct dx_root *)frames[0].bh->b_data; |
2626 | dxroot->info.indirect_levels += 1; | |
2627 | dxtrace(printk(KERN_DEBUG | |
2628 | "Creating %d level index...\n", | |
799578ab | 2629 | dxroot->info.indirect_levels)); |
e08ac99f | 2630 | err = ext4_handle_dirty_dx_node(handle, dir, frame->bh); |
ac27a0ec DK |
2631 | if (err) |
2632 | goto journal_error; | |
e08ac99f AB |
2633 | err = ext4_handle_dirty_dx_node(handle, dir, bh2); |
2634 | brelse(bh2); | |
2635 | restart = 1; | |
2636 | goto journal_error; | |
b4097142 | 2637 | } |
ac27a0ec | 2638 | } |
5b643f9c | 2639 | de = do_split(handle, dir, &bh, frame, &fname->hinfo); |
f8b3b59d TT |
2640 | if (IS_ERR(de)) { |
2641 | err = PTR_ERR(de); | |
ac27a0ec | 2642 | goto cleanup; |
f8b3b59d | 2643 | } |
5b643f9c | 2644 | err = add_dirent_to_buf(handle, fname, dir, inode, de, bh); |
ac27a0ec DK |
2645 | goto cleanup; |
2646 | ||
2647 | journal_error: | |
e08ac99f | 2648 | ext4_std_error(dir->i_sb, err); /* this is a no-op if err == 0 */ |
ac27a0ec | 2649 | cleanup: |
b1deefc9 | 2650 | brelse(bh); |
ac27a0ec | 2651 | dx_release(frames); |
e08ac99f AB |
2652 | /* @restart is true means htree-path has been changed, we need to |
2653 | * repeat dx_probe() to find out valid htree-path | |
2654 | */ | |
2655 | if (restart && err == 0) | |
2656 | goto again; | |
ac27a0ec DK |
2657 | return err; |
2658 | } | |
ac27a0ec DK |
2659 | |
2660 | /* | |
05019a9e TM |
2661 | * ext4_generic_delete_entry deletes a directory entry by merging it |
2662 | * with the previous entry | |
ac27a0ec | 2663 | */ |
2fe34d29 | 2664 | int ext4_generic_delete_entry(struct inode *dir, |
05019a9e TM |
2665 | struct ext4_dir_entry_2 *de_del, |
2666 | struct buffer_head *bh, | |
2667 | void *entry_buf, | |
2668 | int buf_size, | |
2669 | int csum_size) | |
ac27a0ec | 2670 | { |
af5bc92d | 2671 | struct ext4_dir_entry_2 *de, *pde; |
3d0518f4 | 2672 | unsigned int blocksize = dir->i_sb->s_blocksize; |
05019a9e | 2673 | int i; |
b0336e8d | 2674 | |
ac27a0ec DK |
2675 | i = 0; |
2676 | pde = NULL; | |
c30365b9 | 2677 | de = entry_buf; |
05019a9e | 2678 | while (i < buf_size - csum_size) { |
226ba972 | 2679 | if (ext4_check_dir_entry(dir, NULL, de, bh, |
7303cb5b | 2680 | entry_buf, buf_size, i)) |
6a797d27 | 2681 | return -EFSCORRUPTED; |
ac27a0ec | 2682 | if (de == de_del) { |
6c091273 | 2683 | if (pde) { |
a72d7f83 | 2684 | pde->rec_len = ext4_rec_len_to_disk( |
3d0518f4 WY |
2685 | ext4_rec_len_from_disk(pde->rec_len, |
2686 | blocksize) + | |
2687 | ext4_rec_len_from_disk(de->rec_len, | |
2688 | blocksize), | |
2689 | blocksize); | |
6c091273 LR |
2690 | |
2691 | /* wipe entire dir_entry */ | |
2692 | memset(de, 0, ext4_rec_len_from_disk(de->rec_len, | |
2693 | blocksize)); | |
2694 | } else { | |
2695 | /* wipe dir_entry excluding the rec_len field */ | |
ac27a0ec | 2696 | de->inode = 0; |
6c091273 LR |
2697 | memset(&de->name_len, 0, |
2698 | ext4_rec_len_from_disk(de->rec_len, | |
2699 | blocksize) - | |
2700 | offsetof(struct ext4_dir_entry_2, | |
2701 | name_len)); | |
2702 | } | |
2703 | ||
e08ac99f | 2704 | inode_inc_iversion(dir); |
ac27a0ec DK |
2705 | return 0; |
2706 | } | |
3d0518f4 | 2707 | i += ext4_rec_len_from_disk(de->rec_len, blocksize); |
ac27a0ec | 2708 | pde = de; |
3d0518f4 | 2709 | de = ext4_next_entry(de, blocksize); |
ac27a0ec DK |
2710 | } |
2711 | return -ENOENT; | |
2712 | } | |
2713 | ||
05019a9e TM |
2714 | static int ext4_delete_entry(handle_t *handle, |
2715 | struct inode *dir, | |
2716 | struct ext4_dir_entry_2 *de_del, | |
2717 | struct buffer_head *bh) | |
2718 | { | |
2719 | int err, csum_size = 0; | |
2720 | ||
9f40fe54 TM |
2721 | if (ext4_has_inline_data(dir)) { |
2722 | int has_inline_data = 1; | |
2723 | err = ext4_delete_inline_entry(handle, dir, de_del, bh, | |
2724 | &has_inline_data); | |
2725 | if (has_inline_data) | |
2726 | return err; | |
2727 | } | |
2728 | ||
9aa5d32b | 2729 | if (ext4_has_metadata_csum(dir->i_sb)) |
05019a9e TM |
2730 | csum_size = sizeof(struct ext4_dir_entry_tail); |
2731 | ||
2732 | BUFFER_TRACE(bh, "get_write_access"); | |
188c299e JK |
2733 | err = ext4_journal_get_write_access(handle, dir->i_sb, bh, |
2734 | EXT4_JTR_NONE); | |
05019a9e TM |
2735 | if (unlikely(err)) |
2736 | goto out; | |
2737 | ||
2fe34d29 | 2738 | err = ext4_generic_delete_entry(dir, de_del, bh, bh->b_data, |
05019a9e TM |
2739 | dir->i_sb->s_blocksize, csum_size); |
2740 | if (err) | |
2741 | goto out; | |
2742 | ||
2743 | BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata"); | |
f036adb3 | 2744 | err = ext4_handle_dirty_dirblock(handle, dir, bh); |
05019a9e TM |
2745 | if (unlikely(err)) |
2746 | goto out; | |
2747 | ||
2748 | return 0; | |
2749 | out: | |
2750 | if (err != -ENOENT) | |
2751 | ext4_std_error(dir->i_sb, err); | |
2752 | return err; | |
2753 | } | |
2754 | ||
f8628a14 | 2755 | /* |
c7414892 AD |
2756 | * Set directory link count to 1 if nlinks > EXT4_LINK_MAX, or if nlinks == 2 |
2757 | * since this indicates that nlinks count was previously 1 to avoid overflowing | |
2758 | * the 16-bit i_links_count field on disk. Directories with i_nlink == 1 mean | |
2759 | * that subdirectory link counts are not being maintained accurately. | |
2760 | * | |
2761 | * The caller has already checked for i_nlink overflow in case the DIR_LINK | |
2762 | * feature is not enabled and returned -EMLINK. The is_dx() check is a proxy | |
2763 | * for checking S_ISDIR(inode) (since the INODE_INDEX feature will not be set | |
2764 | * on regular files) and to avoid creating huge/slow non-HTREE directories. | |
f8628a14 | 2765 | */ |
15ed2851 | 2766 | static void ext4_inc_count(struct inode *inode) |
f8628a14 AD |
2767 | { |
2768 | inc_nlink(inode); | |
c7414892 AD |
2769 | if (is_dx(inode) && |
2770 | (inode->i_nlink > EXT4_LINK_MAX || inode->i_nlink == 2)) | |
2771 | set_nlink(inode, 1); | |
f8628a14 AD |
2772 | } |
2773 | ||
2774 | /* | |
2775 | * If a directory had nlink == 1, then we should let it be 1. This indicates | |
2776 | * directory has >EXT4_LINK_MAX subdirs. | |
2777 | */ | |
15ed2851 | 2778 | static void ext4_dec_count(struct inode *inode) |
f8628a14 | 2779 | { |
909a4cf1 AD |
2780 | if (!S_ISDIR(inode->i_mode) || inode->i_nlink > 2) |
2781 | drop_nlink(inode); | |
f8628a14 AD |
2782 | } |
2783 | ||
2784 | ||
9b88f9fb JK |
2785 | /* |
2786 | * Add non-directory inode to a directory. On success, the inode reference is | |
2787 | * consumed by dentry is instantiation. This is also indicated by clearing of | |
2788 | * *inodep pointer. On failure, the caller is responsible for dropping the | |
2789 | * inode reference in the safe context. | |
2790 | */ | |
617ba13b | 2791 | static int ext4_add_nondir(handle_t *handle, |
9b88f9fb | 2792 | struct dentry *dentry, struct inode **inodep) |
ac27a0ec | 2793 | { |
a9e26328 | 2794 | struct inode *dir = d_inode(dentry->d_parent); |
9b88f9fb | 2795 | struct inode *inode = *inodep; |
617ba13b | 2796 | int err = ext4_add_entry(handle, dentry, inode); |
ac27a0ec | 2797 | if (!err) { |
4209ae12 | 2798 | err = ext4_mark_inode_dirty(handle, inode); |
a9e26328 JK |
2799 | if (IS_DIRSYNC(dir)) |
2800 | ext4_handle_sync(handle); | |
1e2e547a | 2801 | d_instantiate_new(dentry, inode); |
9b88f9fb | 2802 | *inodep = NULL; |
4209ae12 | 2803 | return err; |
ac27a0ec | 2804 | } |
731b9a54 | 2805 | drop_nlink(inode); |
15247734 | 2806 | ext4_mark_inode_dirty(handle, inode); |
9b88f9fb | 2807 | ext4_orphan_add(handle, inode); |
6b38e842 | 2808 | unlock_new_inode(inode); |
ac27a0ec DK |
2809 | return err; |
2810 | } | |
2811 | ||
2812 | /* | |
2813 | * By the time this is called, we already have created | |
2814 | * the directory cache entry for the new file, but it | |
2815 | * is so far negative - it has no inode. | |
2816 | * | |
2817 | * If the create succeeds, we fill in the inode information | |
2818 | * with d_instantiate(). | |
2819 | */ | |
6c960e68 | 2820 | static int ext4_create(struct mnt_idmap *idmap, struct inode *dir, |
549c7297 | 2821 | struct dentry *dentry, umode_t mode, bool excl) |
ac27a0ec DK |
2822 | { |
2823 | handle_t *handle; | |
a80f7fcf | 2824 | struct inode *inode; |
1139575a | 2825 | int err, credits, retries = 0; |
ac27a0ec | 2826 | |
a7cdadee JK |
2827 | err = dquot_initialize(dir); |
2828 | if (err) | |
2829 | return err; | |
907f4554 | 2830 | |
1139575a | 2831 | credits = (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) + |
eb9cc7e1 | 2832 | EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3); |
ac27a0ec | 2833 | retry: |
f2d40141 | 2834 | inode = ext4_new_inode_start_handle(idmap, dir, mode, &dentry->d_name, |
14f3db55 | 2835 | 0, NULL, EXT4_HT_DIR, credits); |
1139575a | 2836 | handle = ext4_journal_current_handle(); |
ac27a0ec DK |
2837 | err = PTR_ERR(inode); |
2838 | if (!IS_ERR(inode)) { | |
617ba13b | 2839 | inode->i_op = &ext4_file_inode_operations; |
be64f884 | 2840 | inode->i_fop = &ext4_file_operations; |
617ba13b | 2841 | ext4_set_aops(inode); |
9b88f9fb | 2842 | err = ext4_add_nondir(handle, dentry, &inode); |
a80f7fcf HS |
2843 | if (!err) |
2844 | ext4_fc_track_create(handle, dentry); | |
ac27a0ec | 2845 | } |
1139575a TT |
2846 | if (handle) |
2847 | ext4_journal_stop(handle); | |
9b88f9fb JK |
2848 | if (!IS_ERR_OR_NULL(inode)) |
2849 | iput(inode); | |
617ba13b | 2850 | if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries)) |
ac27a0ec DK |
2851 | goto retry; |
2852 | return err; | |
2853 | } | |
2854 | ||
5ebb29be | 2855 | static int ext4_mknod(struct mnt_idmap *idmap, struct inode *dir, |
549c7297 | 2856 | struct dentry *dentry, umode_t mode, dev_t rdev) |
ac27a0ec DK |
2857 | { |
2858 | handle_t *handle; | |
a80f7fcf | 2859 | struct inode *inode; |
1139575a | 2860 | int err, credits, retries = 0; |
ac27a0ec | 2861 | |
a7cdadee JK |
2862 | err = dquot_initialize(dir); |
2863 | if (err) | |
2864 | return err; | |
907f4554 | 2865 | |
1139575a | 2866 | credits = (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) + |
eb9cc7e1 | 2867 | EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3); |
ac27a0ec | 2868 | retry: |
f2d40141 | 2869 | inode = ext4_new_inode_start_handle(idmap, dir, mode, &dentry->d_name, |
14f3db55 | 2870 | 0, NULL, EXT4_HT_DIR, credits); |
1139575a | 2871 | handle = ext4_journal_current_handle(); |
ac27a0ec DK |
2872 | err = PTR_ERR(inode); |
2873 | if (!IS_ERR(inode)) { | |
2874 | init_special_inode(inode, inode->i_mode, rdev); | |
617ba13b | 2875 | inode->i_op = &ext4_special_inode_operations; |
9b88f9fb | 2876 | err = ext4_add_nondir(handle, dentry, &inode); |
aa75f4d3 | 2877 | if (!err) |
a80f7fcf | 2878 | ext4_fc_track_create(handle, dentry); |
ac27a0ec | 2879 | } |
1139575a TT |
2880 | if (handle) |
2881 | ext4_journal_stop(handle); | |
9b88f9fb JK |
2882 | if (!IS_ERR_OR_NULL(inode)) |
2883 | iput(inode); | |
617ba13b | 2884 | if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries)) |
ac27a0ec DK |
2885 | goto retry; |
2886 | return err; | |
2887 | } | |
2888 | ||
011e2b71 | 2889 | static int ext4_tmpfile(struct mnt_idmap *idmap, struct inode *dir, |
863f144f | 2890 | struct file *file, umode_t mode) |
af51a2ac AV |
2891 | { |
2892 | handle_t *handle; | |
2893 | struct inode *inode; | |
2894 | int err, retries = 0; | |
2895 | ||
a7cdadee JK |
2896 | err = dquot_initialize(dir); |
2897 | if (err) | |
2898 | return err; | |
af51a2ac AV |
2899 | |
2900 | retry: | |
f2d40141 | 2901 | inode = ext4_new_inode_start_handle(idmap, dir, mode, |
af51a2ac AV |
2902 | NULL, 0, NULL, |
2903 | EXT4_HT_DIR, | |
2904 | EXT4_MAXQUOTAS_INIT_BLOCKS(dir->i_sb) + | |
2905 | 4 + EXT4_XATTR_TRANS_BLOCKS); | |
2906 | handle = ext4_journal_current_handle(); | |
2907 | err = PTR_ERR(inode); | |
2908 | if (!IS_ERR(inode)) { | |
2909 | inode->i_op = &ext4_file_inode_operations; | |
be64f884 | 2910 | inode->i_fop = &ext4_file_operations; |
af51a2ac | 2911 | ext4_set_aops(inode); |
863f144f | 2912 | d_tmpfile(file, inode); |
af51a2ac AV |
2913 | err = ext4_orphan_add(handle, inode); |
2914 | if (err) | |
43ae9e3f | 2915 | goto err_unlock_inode; |
af51a2ac | 2916 | mark_inode_dirty(inode); |
af51a2ac AV |
2917 | unlock_new_inode(inode); |
2918 | } | |
2919 | if (handle) | |
2920 | ext4_journal_stop(handle); | |
2921 | if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries)) | |
2922 | goto retry; | |
863f144f | 2923 | return finish_open_simple(file, err); |
43ae9e3f | 2924 | err_unlock_inode: |
af51a2ac AV |
2925 | ext4_journal_stop(handle); |
2926 | unlock_new_inode(inode); | |
af51a2ac AV |
2927 | return err; |
2928 | } | |
2929 | ||
a774f9c2 TM |
2930 | struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, |
2931 | struct ext4_dir_entry_2 *de, | |
2932 | int blocksize, int csum_size, | |
2933 | unsigned int parent_ino, int dotdot_real_len) | |
2934 | { | |
2935 | de->inode = cpu_to_le32(inode->i_ino); | |
2936 | de->name_len = 1; | |
471fbbea | 2937 | de->rec_len = ext4_rec_len_to_disk(ext4_dir_rec_len(de->name_len, NULL), |
a774f9c2 TM |
2938 | blocksize); |
2939 | strcpy(de->name, "."); | |
2940 | ext4_set_de_type(inode->i_sb, de, S_IFDIR); | |
2941 | ||
2942 | de = ext4_next_entry(de, blocksize); | |
2943 | de->inode = cpu_to_le32(parent_ino); | |
2944 | de->name_len = 2; | |
2945 | if (!dotdot_real_len) | |
2946 | de->rec_len = ext4_rec_len_to_disk(blocksize - | |
471fbbea | 2947 | (csum_size + ext4_dir_rec_len(1, NULL)), |
a774f9c2 TM |
2948 | blocksize); |
2949 | else | |
2950 | de->rec_len = ext4_rec_len_to_disk( | |
471fbbea DR |
2951 | ext4_dir_rec_len(de->name_len, NULL), |
2952 | blocksize); | |
a774f9c2 TM |
2953 | strcpy(de->name, ".."); |
2954 | ext4_set_de_type(inode->i_sb, de, S_IFDIR); | |
2955 | ||
2956 | return ext4_next_entry(de, blocksize); | |
2957 | } | |
2958 | ||
8016e29f | 2959 | int ext4_init_new_dir(handle_t *handle, struct inode *dir, |
a774f9c2 | 2960 | struct inode *inode) |
ac27a0ec | 2961 | { |
dabd991f | 2962 | struct buffer_head *dir_block = NULL; |
af5bc92d | 2963 | struct ext4_dir_entry_2 *de; |
dc6982ff | 2964 | ext4_lblk_t block = 0; |
3d0518f4 | 2965 | unsigned int blocksize = dir->i_sb->s_blocksize; |
b0336e8d | 2966 | int csum_size = 0; |
a774f9c2 | 2967 | int err; |
ac27a0ec | 2968 | |
9aa5d32b | 2969 | if (ext4_has_metadata_csum(dir->i_sb)) |
b0336e8d DW |
2970 | csum_size = sizeof(struct ext4_dir_entry_tail); |
2971 | ||
3c47d541 TM |
2972 | if (ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) { |
2973 | err = ext4_try_create_inline_dir(handle, dir, inode); | |
2974 | if (err < 0 && err != -ENOSPC) | |
2975 | goto out; | |
2976 | if (!err) | |
2977 | goto out; | |
2978 | } | |
2979 | ||
dc6982ff | 2980 | inode->i_size = 0; |
0f70b406 TT |
2981 | dir_block = ext4_append(handle, inode, &block); |
2982 | if (IS_ERR(dir_block)) | |
2983 | return PTR_ERR(dir_block); | |
a774f9c2 TM |
2984 | de = (struct ext4_dir_entry_2 *)dir_block->b_data; |
2985 | ext4_init_dot_dotdot(inode, de, blocksize, csum_size, dir->i_ino, 0); | |
2986 | set_nlink(inode, 2); | |
ddce3b94 TT |
2987 | if (csum_size) |
2988 | ext4_initialize_dirent_tail(dir_block, blocksize); | |
a774f9c2 TM |
2989 | |
2990 | BUFFER_TRACE(dir_block, "call ext4_handle_dirty_metadata"); | |
f036adb3 | 2991 | err = ext4_handle_dirty_dirblock(handle, inode, dir_block); |
a774f9c2 TM |
2992 | if (err) |
2993 | goto out; | |
2994 | set_buffer_verified(dir_block); | |
2995 | out: | |
2996 | brelse(dir_block); | |
2997 | return err; | |
2998 | } | |
2999 | ||
c54bd91e | 3000 | static int ext4_mkdir(struct mnt_idmap *idmap, struct inode *dir, |
549c7297 | 3001 | struct dentry *dentry, umode_t mode) |
a774f9c2 TM |
3002 | { |
3003 | handle_t *handle; | |
3004 | struct inode *inode; | |
4209ae12 | 3005 | int err, err2 = 0, credits, retries = 0; |
a774f9c2 | 3006 | |
f8628a14 | 3007 | if (EXT4_DIR_LINK_MAX(dir)) |
ac27a0ec DK |
3008 | return -EMLINK; |
3009 | ||
a7cdadee JK |
3010 | err = dquot_initialize(dir); |
3011 | if (err) | |
3012 | return err; | |
907f4554 | 3013 | |
1139575a | 3014 | credits = (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) + |
eb9cc7e1 | 3015 | EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3); |
ac27a0ec | 3016 | retry: |
f2d40141 | 3017 | inode = ext4_new_inode_start_handle(idmap, dir, S_IFDIR | mode, |
1139575a TT |
3018 | &dentry->d_name, |
3019 | 0, NULL, EXT4_HT_DIR, credits); | |
3020 | handle = ext4_journal_current_handle(); | |
ac27a0ec DK |
3021 | err = PTR_ERR(inode); |
3022 | if (IS_ERR(inode)) | |
3023 | goto out_stop; | |
3024 | ||
617ba13b MC |
3025 | inode->i_op = &ext4_dir_inode_operations; |
3026 | inode->i_fop = &ext4_dir_operations; | |
a774f9c2 | 3027 | err = ext4_init_new_dir(handle, dir, inode); |
dabd991f NK |
3028 | if (err) |
3029 | goto out_clear_inode; | |
3030 | err = ext4_mark_inode_dirty(handle, inode); | |
3031 | if (!err) | |
3032 | err = ext4_add_entry(handle, dentry, inode); | |
ac27a0ec | 3033 | if (err) { |
4cdeed86 AK |
3034 | out_clear_inode: |
3035 | clear_nlink(inode); | |
9b88f9fb | 3036 | ext4_orphan_add(handle, inode); |
6b38e842 | 3037 | unlock_new_inode(inode); |
4209ae12 HS |
3038 | err2 = ext4_mark_inode_dirty(handle, inode); |
3039 | if (unlikely(err2)) | |
3040 | err = err2; | |
9b88f9fb | 3041 | ext4_journal_stop(handle); |
af5bc92d | 3042 | iput(inode); |
9b88f9fb | 3043 | goto out_retry; |
ac27a0ec | 3044 | } |
15ed2851 | 3045 | ext4_inc_count(dir); |
aa75f4d3 | 3046 | |
617ba13b | 3047 | ext4_update_dx_flag(dir); |
dabd991f NK |
3048 | err = ext4_mark_inode_dirty(handle, dir); |
3049 | if (err) | |
3050 | goto out_clear_inode; | |
1e2e547a | 3051 | d_instantiate_new(dentry, inode); |
a80f7fcf | 3052 | ext4_fc_track_create(handle, dentry); |
1139575a TT |
3053 | if (IS_DIRSYNC(dir)) |
3054 | ext4_handle_sync(handle); | |
3055 | ||
ac27a0ec | 3056 | out_stop: |
1139575a TT |
3057 | if (handle) |
3058 | ext4_journal_stop(handle); | |
9b88f9fb | 3059 | out_retry: |
617ba13b | 3060 | if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries)) |
ac27a0ec DK |
3061 | goto retry; |
3062 | return err; | |
3063 | } | |
3064 | ||
3065 | /* | |
3066 | * routine to check that the specified directory is empty (for rmdir) | |
3067 | */ | |
a7550b30 | 3068 | bool ext4_empty_dir(struct inode *inode) |
ac27a0ec | 3069 | { |
498e5f24 | 3070 | unsigned int offset; |
af5bc92d | 3071 | struct buffer_head *bh; |
64d4ce89 | 3072 | struct ext4_dir_entry_2 *de; |
af5bc92d | 3073 | struct super_block *sb; |
ac27a0ec | 3074 | |
61f86638 TM |
3075 | if (ext4_has_inline_data(inode)) { |
3076 | int has_inline_data = 1; | |
a7550b30 | 3077 | int ret; |
61f86638 | 3078 | |
a7550b30 | 3079 | ret = empty_inline_dir(inode, &has_inline_data); |
61f86638 | 3080 | if (has_inline_data) |
a7550b30 | 3081 | return ret; |
61f86638 TM |
3082 | } |
3083 | ||
ac27a0ec | 3084 | sb = inode->i_sb; |
471fbbea DR |
3085 | if (inode->i_size < ext4_dir_rec_len(1, NULL) + |
3086 | ext4_dir_rec_len(2, NULL)) { | |
dc6982ff | 3087 | EXT4_ERROR_INODE(inode, "invalid size"); |
7aab5c84 | 3088 | return false; |
ac27a0ec | 3089 | } |
4e19d6b6 TT |
3090 | /* The first directory block must not be a hole, |
3091 | * so treat it as DIRENT_HTREE | |
3092 | */ | |
3093 | bh = ext4_read_dirblock(inode, 0, DIRENT_HTREE); | |
dc6982ff | 3094 | if (IS_ERR(bh)) |
7aab5c84 | 3095 | return false; |
dc6982ff | 3096 | |
617ba13b | 3097 | de = (struct ext4_dir_entry_2 *) bh->b_data; |
64d4ce89 JK |
3098 | if (ext4_check_dir_entry(inode, NULL, de, bh, bh->b_data, bh->b_size, |
3099 | 0) || | |
3100 | le32_to_cpu(de->inode) != inode->i_ino || strcmp(".", de->name)) { | |
3101 | ext4_warning_inode(inode, "directory missing '.'"); | |
3102 | brelse(bh); | |
7aab5c84 | 3103 | return false; |
64d4ce89 JK |
3104 | } |
3105 | offset = ext4_rec_len_from_disk(de->rec_len, sb->s_blocksize); | |
3106 | de = ext4_next_entry(de, sb->s_blocksize); | |
3107 | if (ext4_check_dir_entry(inode, NULL, de, bh, bh->b_data, bh->b_size, | |
3108 | offset) || | |
3109 | le32_to_cpu(de->inode) == 0 || strcmp("..", de->name)) { | |
3110 | ext4_warning_inode(inode, "directory missing '..'"); | |
af5bc92d | 3111 | brelse(bh); |
7aab5c84 | 3112 | return false; |
ac27a0ec | 3113 | } |
64d4ce89 | 3114 | offset += ext4_rec_len_from_disk(de->rec_len, sb->s_blocksize); |
af5bc92d | 3115 | while (offset < inode->i_size) { |
64d4ce89 | 3116 | if (!(offset & (sb->s_blocksize - 1))) { |
24676da4 | 3117 | unsigned int lblock; |
af5bc92d | 3118 | brelse(bh); |
24676da4 | 3119 | lblock = offset >> EXT4_BLOCK_SIZE_BITS(sb); |
dc6982ff | 3120 | bh = ext4_read_dirblock(inode, lblock, EITHER); |
4e19d6b6 TT |
3121 | if (bh == NULL) { |
3122 | offset += sb->s_blocksize; | |
3123 | continue; | |
3124 | } | |
dc6982ff | 3125 | if (IS_ERR(bh)) |
7aab5c84 | 3126 | return false; |
ac27a0ec | 3127 | } |
64d4ce89 JK |
3128 | de = (struct ext4_dir_entry_2 *) (bh->b_data + |
3129 | (offset & (sb->s_blocksize - 1))); | |
226ba972 | 3130 | if (ext4_check_dir_entry(inode, NULL, de, bh, |
b24e77ef YB |
3131 | bh->b_data, bh->b_size, offset) || |
3132 | le32_to_cpu(de->inode)) { | |
af5bc92d | 3133 | brelse(bh); |
a7550b30 | 3134 | return false; |
ac27a0ec | 3135 | } |
3d0518f4 | 3136 | offset += ext4_rec_len_from_disk(de->rec_len, sb->s_blocksize); |
ac27a0ec | 3137 | } |
af5bc92d | 3138 | brelse(bh); |
a7550b30 | 3139 | return true; |
ac27a0ec DK |
3140 | } |
3141 | ||
af5bc92d | 3142 | static int ext4_rmdir(struct inode *dir, struct dentry *dentry) |
ac27a0ec DK |
3143 | { |
3144 | int retval; | |
af5bc92d TT |
3145 | struct inode *inode; |
3146 | struct buffer_head *bh; | |
3147 | struct ext4_dir_entry_2 *de; | |
8dcfaad2 | 3148 | handle_t *handle = NULL; |
ac27a0ec | 3149 | |
eb8ab444 | 3150 | if (unlikely(ext4_forced_shutdown(dir->i_sb))) |
0db1ff22 TT |
3151 | return -EIO; |
3152 | ||
ac27a0ec DK |
3153 | /* Initialize quotas before so that eventual writes go in |
3154 | * separate transaction */ | |
a7cdadee JK |
3155 | retval = dquot_initialize(dir); |
3156 | if (retval) | |
3157 | return retval; | |
3158 | retval = dquot_initialize(d_inode(dentry)); | |
3159 | if (retval) | |
3160 | return retval; | |
907f4554 | 3161 | |
ac27a0ec | 3162 | retval = -ENOENT; |
32f7f22c | 3163 | bh = ext4_find_entry(dir, &dentry->d_name, &de, NULL); |
36de9286 TT |
3164 | if (IS_ERR(bh)) |
3165 | return PTR_ERR(bh); | |
ac27a0ec DK |
3166 | if (!bh) |
3167 | goto end_rmdir; | |
3168 | ||
2b0143b5 | 3169 | inode = d_inode(dentry); |
ac27a0ec | 3170 | |
6a797d27 | 3171 | retval = -EFSCORRUPTED; |
ac27a0ec DK |
3172 | if (le32_to_cpu(de->inode) != inode->i_ino) |
3173 | goto end_rmdir; | |
3174 | ||
3175 | retval = -ENOTEMPTY; | |
e875a2dd | 3176 | if (!ext4_empty_dir(inode)) |
ac27a0ec DK |
3177 | goto end_rmdir; |
3178 | ||
8dcfaad2 | 3179 | handle = ext4_journal_start(dir, EXT4_HT_DIR, |
64044abf | 3180 | EXT4_DATA_TRANS_BLOCKS(dir->i_sb)); |
8dcfaad2 TT |
3181 | if (IS_ERR(handle)) { |
3182 | retval = PTR_ERR(handle); | |
3183 | handle = NULL; | |
3184 | goto end_rmdir; | |
3185 | } | |
3186 | ||
3187 | if (IS_DIRSYNC(dir)) | |
3188 | ext4_handle_sync(handle); | |
3189 | ||
617ba13b | 3190 | retval = ext4_delete_entry(handle, dir, de, bh); |
ac27a0ec DK |
3191 | if (retval) |
3192 | goto end_rmdir; | |
f8628a14 | 3193 | if (!EXT4_DIR_LINK_EMPTY(inode)) |
b03a2f7e AD |
3194 | ext4_warning_inode(inode, |
3195 | "empty directory '%.*s' has too many links (%u)", | |
3196 | dentry->d_name.len, dentry->d_name.name, | |
af5bc92d | 3197 | inode->i_nlink); |
ee73f9a5 | 3198 | inode_inc_iversion(inode); |
ac27a0ec DK |
3199 | clear_nlink(inode); |
3200 | /* There's no need to set i_disksize: the fact that i_nlink is | |
3201 | * zero will ensure that the right thing happens during any | |
3202 | * recovery. */ | |
3203 | inode->i_size = 0; | |
617ba13b | 3204 | ext4_orphan_add(handle, inode); |
1bc33893 JL |
3205 | dir->i_mtime = inode_set_ctime_current(dir); |
3206 | inode_set_ctime_current(inode); | |
4209ae12 HS |
3207 | retval = ext4_mark_inode_dirty(handle, inode); |
3208 | if (retval) | |
3209 | goto end_rmdir; | |
15ed2851 | 3210 | ext4_dec_count(dir); |
617ba13b | 3211 | ext4_update_dx_flag(dir); |
a80f7fcf | 3212 | ext4_fc_track_unlink(handle, dentry); |
4209ae12 | 3213 | retval = ext4_mark_inode_dirty(handle, dir); |
ac27a0ec | 3214 | |
5298d4bf | 3215 | #if IS_ENABLED(CONFIG_UNICODE) |
b886ee3e GKB |
3216 | /* VFS negative dentries are incompatible with Encoding and |
3217 | * Case-insensitiveness. Eventually we'll want avoid | |
3218 | * invalidating the dentries here, alongside with returning the | |
3219 | * negative dentries at ext4_lookup(), when it is better | |
3220 | * supported by the VFS for the CI case. | |
3221 | */ | |
3222 | if (IS_CASEFOLDED(dir)) | |
3223 | d_invalidate(dentry); | |
3224 | #endif | |
3225 | ||
ac27a0ec | 3226 | end_rmdir: |
af5bc92d | 3227 | brelse(bh); |
8dcfaad2 TT |
3228 | if (handle) |
3229 | ext4_journal_stop(handle); | |
ac27a0ec DK |
3230 | return retval; |
3231 | } | |
3232 | ||
4c0d5778 EB |
3233 | int __ext4_unlink(struct inode *dir, const struct qstr *d_name, |
3234 | struct inode *inode, | |
3235 | struct dentry *dentry /* NULL during fast_commit recovery */) | |
ac27a0ec | 3236 | { |
8016e29f | 3237 | int retval = -ENOENT; |
af5bc92d TT |
3238 | struct buffer_head *bh; |
3239 | struct ext4_dir_entry_2 *de; | |
4c0d5778 | 3240 | handle_t *handle; |
8016e29f | 3241 | int skip_remove_dentry = 0; |
ac27a0ec | 3242 | |
4c0d5778 EB |
3243 | /* |
3244 | * Keep this outside the transaction; it may have to set up the | |
3245 | * directory's encryption key, which isn't GFP_NOFS-safe. | |
3246 | */ | |
8016e29f HS |
3247 | bh = ext4_find_entry(dir, d_name, &de, NULL); |
3248 | if (IS_ERR(bh)) | |
3249 | return PTR_ERR(bh); | |
ac27a0ec | 3250 | |
8016e29f HS |
3251 | if (!bh) |
3252 | return -ENOENT; | |
ac27a0ec | 3253 | |
e5f78159 | 3254 | if (le32_to_cpu(de->inode) != inode->i_ino) { |
8016e29f HS |
3255 | /* |
3256 | * It's okay if we find dont find dentry which matches | |
3257 | * the inode. That's because it might have gotten | |
3258 | * renamed to a different inode number | |
3259 | */ | |
3260 | if (EXT4_SB(inode->i_sb)->s_mount_state & EXT4_FC_REPLAY) | |
3261 | skip_remove_dentry = 1; | |
3262 | else | |
4c0d5778 EB |
3263 | goto out_bh; |
3264 | } | |
3265 | ||
3266 | handle = ext4_journal_start(dir, EXT4_HT_DIR, | |
3267 | EXT4_DATA_TRANS_BLOCKS(dir->i_sb)); | |
3268 | if (IS_ERR(handle)) { | |
3269 | retval = PTR_ERR(handle); | |
3270 | goto out_bh; | |
931b6864 TT |
3271 | } |
3272 | ||
3273 | if (IS_DIRSYNC(dir)) | |
3274 | ext4_handle_sync(handle); | |
3275 | ||
8016e29f HS |
3276 | if (!skip_remove_dentry) { |
3277 | retval = ext4_delete_entry(handle, dir, de, bh); | |
3278 | if (retval) | |
4c0d5778 | 3279 | goto out_handle; |
1bc33893 | 3280 | dir->i_mtime = inode_set_ctime_current(dir); |
8016e29f HS |
3281 | ext4_update_dx_flag(dir); |
3282 | retval = ext4_mark_inode_dirty(handle, dir); | |
3283 | if (retval) | |
4c0d5778 | 3284 | goto out_handle; |
8016e29f HS |
3285 | } else { |
3286 | retval = 0; | |
3287 | } | |
c7df4a1e TT |
3288 | if (inode->i_nlink == 0) |
3289 | ext4_warning_inode(inode, "Deleting file '%.*s' with no links", | |
8016e29f | 3290 | d_name->len, d_name->name); |
c7df4a1e TT |
3291 | else |
3292 | drop_nlink(inode); | |
ac27a0ec | 3293 | if (!inode->i_nlink) |
617ba13b | 3294 | ext4_orphan_add(handle, inode); |
1bc33893 | 3295 | inode_set_ctime_current(inode); |
4209ae12 | 3296 | retval = ext4_mark_inode_dirty(handle, inode); |
4c0d5778 EB |
3297 | if (dentry && !retval) |
3298 | ext4_fc_track_unlink(handle, dentry); | |
3299 | out_handle: | |
3300 | ext4_journal_stop(handle); | |
3301 | out_bh: | |
8016e29f HS |
3302 | brelse(bh); |
3303 | return retval; | |
3304 | } | |
3305 | ||
3306 | static int ext4_unlink(struct inode *dir, struct dentry *dentry) | |
3307 | { | |
3308 | int retval; | |
3309 | ||
eb8ab444 | 3310 | if (unlikely(ext4_forced_shutdown(dir->i_sb))) |
8016e29f HS |
3311 | return -EIO; |
3312 | ||
3313 | trace_ext4_unlink_enter(dir, dentry); | |
3314 | /* | |
3315 | * Initialize quotas before so that eventual writes go | |
3316 | * in separate transaction | |
3317 | */ | |
3318 | retval = dquot_initialize(dir); | |
3319 | if (retval) | |
3320 | goto out_trace; | |
3321 | retval = dquot_initialize(d_inode(dentry)); | |
3322 | if (retval) | |
3323 | goto out_trace; | |
3324 | ||
4c0d5778 | 3325 | retval = __ext4_unlink(dir, &dentry->d_name, d_inode(dentry), dentry); |
5298d4bf | 3326 | #if IS_ENABLED(CONFIG_UNICODE) |
b886ee3e GKB |
3327 | /* VFS negative dentries are incompatible with Encoding and |
3328 | * Case-insensitiveness. Eventually we'll want avoid | |
3329 | * invalidating the dentries here, alongside with returning the | |
3330 | * negative dentries at ext4_lookup(), when it is better | |
3331 | * supported by the VFS for the CI case. | |
3332 | */ | |
3333 | if (IS_CASEFOLDED(dir)) | |
3334 | d_invalidate(dentry); | |
3335 | #endif | |
3336 | ||
e5f78159 | 3337 | out_trace: |
0562e0ba | 3338 | trace_ext4_unlink_exit(dentry, retval); |
ac27a0ec DK |
3339 | return retval; |
3340 | } | |
3341 | ||
6493792d ZY |
3342 | static int ext4_init_symlink_block(handle_t *handle, struct inode *inode, |
3343 | struct fscrypt_str *disk_link) | |
3344 | { | |
3345 | struct buffer_head *bh; | |
3346 | char *kaddr; | |
3347 | int err = 0; | |
3348 | ||
3349 | bh = ext4_bread(handle, inode, 0, EXT4_GET_BLOCKS_CREATE); | |
3350 | if (IS_ERR(bh)) | |
3351 | return PTR_ERR(bh); | |
3352 | ||
3353 | BUFFER_TRACE(bh, "get_write_access"); | |
3354 | err = ext4_journal_get_write_access(handle, inode->i_sb, bh, EXT4_JTR_NONE); | |
3355 | if (err) | |
3356 | goto out; | |
3357 | ||
3358 | kaddr = (char *)bh->b_data; | |
3359 | memcpy(kaddr, disk_link->name, disk_link->len); | |
3360 | inode->i_size = disk_link->len - 1; | |
3361 | EXT4_I(inode)->i_disksize = inode->i_size; | |
3362 | err = ext4_handle_dirty_metadata(handle, inode, bh); | |
3363 | out: | |
3364 | brelse(bh); | |
3365 | return err; | |
3366 | } | |
3367 | ||
7a77db95 | 3368 | static int ext4_symlink(struct mnt_idmap *idmap, struct inode *dir, |
af5bc92d | 3369 | struct dentry *dentry, const char *symname) |
ac27a0ec DK |
3370 | { |
3371 | handle_t *handle; | |
af5bc92d | 3372 | struct inode *inode; |
f348c252 | 3373 | int err, len = strlen(symname); |
df5e6223 | 3374 | int credits; |
a7550b30 | 3375 | struct fscrypt_str disk_link; |
6493792d | 3376 | int retries = 0; |
ac27a0ec | 3377 | |
eb8ab444 | 3378 | if (unlikely(ext4_forced_shutdown(dir->i_sb))) |
0db1ff22 TT |
3379 | return -EIO; |
3380 | ||
78e1060c EB |
3381 | err = fscrypt_prepare_symlink(dir, symname, len, dir->i_sb->s_blocksize, |
3382 | &disk_link); | |
3383 | if (err) | |
3384 | return err; | |
ac27a0ec | 3385 | |
a7cdadee JK |
3386 | err = dquot_initialize(dir); |
3387 | if (err) | |
78e1060c | 3388 | return err; |
907f4554 | 3389 | |
6493792d ZY |
3390 | /* |
3391 | * EXT4_INDEX_EXTRA_TRANS_BLOCKS for addition of entry into the | |
3392 | * directory. +3 for inode, inode bitmap, group descriptor allocation. | |
3393 | * EXT4_DATA_TRANS_BLOCKS for the data block allocation and | |
3394 | * modification. | |
3395 | */ | |
3396 | credits = EXT4_DATA_TRANS_BLOCKS(dir->i_sb) + | |
3397 | EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3; | |
3398 | retry: | |
f2d40141 | 3399 | inode = ext4_new_inode_start_handle(idmap, dir, S_IFLNK|S_IRWXUGO, |
1139575a TT |
3400 | &dentry->d_name, 0, NULL, |
3401 | EXT4_HT_DIR, credits); | |
3402 | handle = ext4_journal_current_handle(); | |
f348c252 TT |
3403 | if (IS_ERR(inode)) { |
3404 | if (handle) | |
3405 | ext4_journal_stop(handle); | |
6493792d ZY |
3406 | err = PTR_ERR(inode); |
3407 | goto out_retry; | |
f348c252 TT |
3408 | } |
3409 | ||
78e1060c EB |
3410 | if (IS_ENCRYPTED(inode)) { |
3411 | err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link); | |
ef1eb3aa | 3412 | if (err) |
f348c252 | 3413 | goto err_drop_inode; |
a7a67e8a | 3414 | inode->i_op = &ext4_encrypted_symlink_inode_operations; |
6493792d ZY |
3415 | } else { |
3416 | if ((disk_link.len > EXT4_N_BLOCKS * 4)) { | |
3417 | inode->i_op = &ext4_symlink_inode_operations; | |
3418 | } else { | |
3419 | inode->i_op = &ext4_fast_symlink_inode_operations; | |
3420 | inode->i_link = (char *)&EXT4_I(inode)->i_data; | |
3421 | } | |
f348c252 | 3422 | } |
ac27a0ec | 3423 | |
f348c252 | 3424 | if ((disk_link.len > EXT4_N_BLOCKS * 4)) { |
6493792d ZY |
3425 | /* alloc symlink block and fill it */ |
3426 | err = ext4_init_symlink_block(handle, inode, &disk_link); | |
f348c252 | 3427 | if (err) |
df5e6223 | 3428 | goto err_drop_inode; |
ac27a0ec | 3429 | } else { |
e65187e6 | 3430 | /* clear the extent format for fast symlink */ |
12e9b892 | 3431 | ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS); |
f348c252 TT |
3432 | memcpy((char *)&EXT4_I(inode)->i_data, disk_link.name, |
3433 | disk_link.len); | |
3434 | inode->i_size = disk_link.len - 1; | |
6493792d | 3435 | EXT4_I(inode)->i_disksize = inode->i_size; |
ac27a0ec | 3436 | } |
9b88f9fb | 3437 | err = ext4_add_nondir(handle, dentry, &inode); |
1139575a TT |
3438 | if (handle) |
3439 | ext4_journal_stop(handle); | |
784a0995 | 3440 | iput(inode); |
6493792d | 3441 | goto out_retry; |
78e1060c | 3442 | |
df5e6223 | 3443 | err_drop_inode: |
f348c252 | 3444 | clear_nlink(inode); |
15247734 | 3445 | ext4_mark_inode_dirty(handle, inode); |
6493792d | 3446 | ext4_orphan_add(handle, inode); |
df5e6223 | 3447 | unlock_new_inode(inode); |
6493792d ZY |
3448 | if (handle) |
3449 | ext4_journal_stop(handle); | |
df5e6223 | 3450 | iput(inode); |
6493792d ZY |
3451 | out_retry: |
3452 | if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries)) | |
3453 | goto retry; | |
78e1060c EB |
3454 | if (disk_link.name != (unsigned char *)symname) |
3455 | kfree(disk_link.name); | |
df5e6223 | 3456 | return err; |
ac27a0ec DK |
3457 | } |
3458 | ||
8016e29f | 3459 | int __ext4_link(struct inode *dir, struct inode *inode, struct dentry *dentry) |
ac27a0ec DK |
3460 | { |
3461 | handle_t *handle; | |
ac27a0ec | 3462 | int err, retries = 0; |
ac27a0ec | 3463 | retry: |
9924a92a TT |
3464 | handle = ext4_journal_start(dir, EXT4_HT_DIR, |
3465 | (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) + | |
af51a2ac | 3466 | EXT4_INDEX_EXTRA_TRANS_BLOCKS) + 1); |
ac27a0ec DK |
3467 | if (IS_ERR(handle)) |
3468 | return PTR_ERR(handle); | |
3469 | ||
3470 | if (IS_DIRSYNC(dir)) | |
0390131b | 3471 | ext4_handle_sync(handle); |
ac27a0ec | 3472 | |
1bc33893 | 3473 | inode_set_ctime_current(inode); |
15ed2851 | 3474 | ext4_inc_count(inode); |
7de9c6ee | 3475 | ihold(inode); |
ac27a0ec | 3476 | |
6b38e842 AV |
3477 | err = ext4_add_entry(handle, dentry, inode); |
3478 | if (!err) { | |
4209ae12 | 3479 | err = ext4_mark_inode_dirty(handle, inode); |
af51a2ac AV |
3480 | /* this can happen only for tmpfile being |
3481 | * linked the first time | |
3482 | */ | |
3483 | if (inode->i_nlink == 1) | |
3484 | ext4_orphan_del(handle, inode); | |
6b38e842 | 3485 | d_instantiate(dentry, inode); |
a80f7fcf | 3486 | ext4_fc_track_link(handle, dentry); |
6b38e842 AV |
3487 | } else { |
3488 | drop_nlink(inode); | |
3489 | iput(inode); | |
3490 | } | |
617ba13b MC |
3491 | ext4_journal_stop(handle); |
3492 | if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries)) | |
ac27a0ec DK |
3493 | goto retry; |
3494 | return err; | |
3495 | } | |
3496 | ||
8016e29f HS |
3497 | static int ext4_link(struct dentry *old_dentry, |
3498 | struct inode *dir, struct dentry *dentry) | |
3499 | { | |
3500 | struct inode *inode = d_inode(old_dentry); | |
3501 | int err; | |
3502 | ||
3503 | if (inode->i_nlink >= EXT4_LINK_MAX) | |
3504 | return -EMLINK; | |
3505 | ||
3506 | err = fscrypt_prepare_link(old_dentry, dir, dentry); | |
3507 | if (err) | |
3508 | return err; | |
3509 | ||
3510 | if ((ext4_test_inode_flag(dir, EXT4_INODE_PROJINHERIT)) && | |
3511 | (!projid_eq(EXT4_I(dir)->i_projid, | |
3512 | EXT4_I(old_dentry->d_inode)->i_projid))) | |
3513 | return -EXDEV; | |
3514 | ||
3515 | err = dquot_initialize(dir); | |
3516 | if (err) | |
3517 | return err; | |
3518 | return __ext4_link(dir, inode, dentry); | |
3519 | } | |
32f7f22c TM |
3520 | |
3521 | /* | |
3522 | * Try to find buffer head where contains the parent block. | |
3523 | * It should be the inode block if it is inlined or the 1st block | |
3524 | * if it is a normal dir. | |
3525 | */ | |
3526 | static struct buffer_head *ext4_get_first_dir_block(handle_t *handle, | |
3527 | struct inode *inode, | |
3528 | int *retval, | |
3529 | struct ext4_dir_entry_2 **parent_de, | |
3530 | int *inlined) | |
3531 | { | |
3532 | struct buffer_head *bh; | |
3533 | ||
3534 | if (!ext4_has_inline_data(inode)) { | |
0be698ec YB |
3535 | struct ext4_dir_entry_2 *de; |
3536 | unsigned int offset; | |
3537 | ||
4e19d6b6 TT |
3538 | /* The first directory block must not be a hole, so |
3539 | * treat it as DIRENT_HTREE | |
3540 | */ | |
3541 | bh = ext4_read_dirblock(inode, 0, DIRENT_HTREE); | |
dc6982ff TT |
3542 | if (IS_ERR(bh)) { |
3543 | *retval = PTR_ERR(bh); | |
32f7f22c TM |
3544 | return NULL; |
3545 | } | |
0be698ec YB |
3546 | |
3547 | de = (struct ext4_dir_entry_2 *) bh->b_data; | |
3548 | if (ext4_check_dir_entry(inode, NULL, de, bh, bh->b_data, | |
3549 | bh->b_size, 0) || | |
3550 | le32_to_cpu(de->inode) != inode->i_ino || | |
3551 | strcmp(".", de->name)) { | |
3552 | EXT4_ERROR_INODE(inode, "directory missing '.'"); | |
3553 | brelse(bh); | |
3554 | *retval = -EFSCORRUPTED; | |
3555 | return NULL; | |
3556 | } | |
3557 | offset = ext4_rec_len_from_disk(de->rec_len, | |
3558 | inode->i_sb->s_blocksize); | |
3559 | de = ext4_next_entry(de, inode->i_sb->s_blocksize); | |
3560 | if (ext4_check_dir_entry(inode, NULL, de, bh, bh->b_data, | |
3561 | bh->b_size, offset) || | |
3562 | le32_to_cpu(de->inode) == 0 || strcmp("..", de->name)) { | |
3563 | EXT4_ERROR_INODE(inode, "directory missing '..'"); | |
3564 | brelse(bh); | |
3565 | *retval = -EFSCORRUPTED; | |
3566 | return NULL; | |
3567 | } | |
3568 | *parent_de = de; | |
3569 | ||
32f7f22c TM |
3570 | return bh; |
3571 | } | |
3572 | ||
3573 | *inlined = 1; | |
3574 | return ext4_get_first_inline_block(inode, parent_de, retval); | |
3575 | } | |
ac27a0ec | 3576 | |
c0d268c3 MS |
3577 | struct ext4_renament { |
3578 | struct inode *dir; | |
3579 | struct dentry *dentry; | |
3580 | struct inode *inode; | |
bd42998a MS |
3581 | bool is_dir; |
3582 | int dir_nlink_delta; | |
c0d268c3 MS |
3583 | |
3584 | /* entry for "dentry" */ | |
3585 | struct buffer_head *bh; | |
3586 | struct ext4_dir_entry_2 *de; | |
3587 | int inlined; | |
3588 | ||
3589 | /* entry for ".." in inode if it's a directory */ | |
3590 | struct buffer_head *dir_bh; | |
3591 | struct ext4_dir_entry_2 *parent_de; | |
3592 | int dir_inlined; | |
3593 | }; | |
3594 | ||
bd1af145 MS |
3595 | static int ext4_rename_dir_prepare(handle_t *handle, struct ext4_renament *ent) |
3596 | { | |
3597 | int retval; | |
3598 | ||
3599 | ent->dir_bh = ext4_get_first_dir_block(handle, ent->inode, | |
3600 | &retval, &ent->parent_de, | |
3601 | &ent->dir_inlined); | |
3602 | if (!ent->dir_bh) | |
3603 | return retval; | |
3604 | if (le32_to_cpu(ent->parent_de->inode) != ent->dir->i_ino) | |
6a797d27 | 3605 | return -EFSCORRUPTED; |
bd1af145 | 3606 | BUFFER_TRACE(ent->dir_bh, "get_write_access"); |
188c299e JK |
3607 | return ext4_journal_get_write_access(handle, ent->dir->i_sb, |
3608 | ent->dir_bh, EXT4_JTR_NONE); | |
bd1af145 MS |
3609 | } |
3610 | ||
3611 | static int ext4_rename_dir_finish(handle_t *handle, struct ext4_renament *ent, | |
3612 | unsigned dir_ino) | |
3613 | { | |
3614 | int retval; | |
3615 | ||
3616 | ent->parent_de->inode = cpu_to_le32(dir_ino); | |
3617 | BUFFER_TRACE(ent->dir_bh, "call ext4_handle_dirty_metadata"); | |
3618 | if (!ent->dir_inlined) { | |
3619 | if (is_dx(ent->inode)) { | |
3620 | retval = ext4_handle_dirty_dx_node(handle, | |
3621 | ent->inode, | |
3622 | ent->dir_bh); | |
3623 | } else { | |
f036adb3 TT |
3624 | retval = ext4_handle_dirty_dirblock(handle, ent->inode, |
3625 | ent->dir_bh); | |
bd1af145 MS |
3626 | } |
3627 | } else { | |
3628 | retval = ext4_mark_inode_dirty(handle, ent->inode); | |
3629 | } | |
3630 | if (retval) { | |
3631 | ext4_std_error(ent->dir->i_sb, retval); | |
3632 | return retval; | |
3633 | } | |
3634 | return 0; | |
3635 | } | |
3636 | ||
3637 | static int ext4_setent(handle_t *handle, struct ext4_renament *ent, | |
3638 | unsigned ino, unsigned file_type) | |
3639 | { | |
4209ae12 | 3640 | int retval, retval2; |
bd1af145 MS |
3641 | |
3642 | BUFFER_TRACE(ent->bh, "get write access"); | |
188c299e JK |
3643 | retval = ext4_journal_get_write_access(handle, ent->dir->i_sb, ent->bh, |
3644 | EXT4_JTR_NONE); | |
bd1af145 MS |
3645 | if (retval) |
3646 | return retval; | |
3647 | ent->de->inode = cpu_to_le32(ino); | |
e2b911c5 | 3648 | if (ext4_has_feature_filetype(ent->dir->i_sb)) |
bd1af145 | 3649 | ent->de->file_type = file_type; |
ee73f9a5 | 3650 | inode_inc_iversion(ent->dir); |
1bc33893 | 3651 | ent->dir->i_mtime = inode_set_ctime_current(ent->dir); |
4209ae12 | 3652 | retval = ext4_mark_inode_dirty(handle, ent->dir); |
bd1af145 MS |
3653 | BUFFER_TRACE(ent->bh, "call ext4_handle_dirty_metadata"); |
3654 | if (!ent->inlined) { | |
4209ae12 HS |
3655 | retval2 = ext4_handle_dirty_dirblock(handle, ent->dir, ent->bh); |
3656 | if (unlikely(retval2)) { | |
3657 | ext4_std_error(ent->dir->i_sb, retval2); | |
3658 | return retval2; | |
bd1af145 MS |
3659 | } |
3660 | } | |
4209ae12 | 3661 | return retval; |
bd1af145 MS |
3662 | } |
3663 | ||
b7ff91fd | 3664 | static void ext4_resetent(handle_t *handle, struct ext4_renament *ent, |
3665 | unsigned ino, unsigned file_type) | |
3666 | { | |
3667 | struct ext4_renament old = *ent; | |
3668 | int retval = 0; | |
3669 | ||
3670 | /* | |
3671 | * old->de could have moved from under us during make indexed dir, | |
3672 | * so the old->de may no longer valid and need to find it again | |
3673 | * before reset old inode info. | |
3674 | */ | |
c9f62c8b EW |
3675 | old.bh = ext4_find_entry(old.dir, &old.dentry->d_name, &old.de, |
3676 | &old.inlined); | |
b7ff91fd | 3677 | if (IS_ERR(old.bh)) |
3678 | retval = PTR_ERR(old.bh); | |
3679 | if (!old.bh) | |
3680 | retval = -ENOENT; | |
3681 | if (retval) { | |
3682 | ext4_std_error(old.dir->i_sb, retval); | |
3683 | return; | |
3684 | } | |
3685 | ||
3686 | ext4_setent(handle, &old, ino, file_type); | |
3687 | brelse(old.bh); | |
3688 | } | |
3689 | ||
bd1af145 MS |
3690 | static int ext4_find_delete_entry(handle_t *handle, struct inode *dir, |
3691 | const struct qstr *d_name) | |
3692 | { | |
3693 | int retval = -ENOENT; | |
3694 | struct buffer_head *bh; | |
3695 | struct ext4_dir_entry_2 *de; | |
3696 | ||
3697 | bh = ext4_find_entry(dir, d_name, &de, NULL); | |
36de9286 TT |
3698 | if (IS_ERR(bh)) |
3699 | return PTR_ERR(bh); | |
bd1af145 MS |
3700 | if (bh) { |
3701 | retval = ext4_delete_entry(handle, dir, de, bh); | |
3702 | brelse(bh); | |
3703 | } | |
3704 | return retval; | |
3705 | } | |
3706 | ||
d80d448c DW |
3707 | static void ext4_rename_delete(handle_t *handle, struct ext4_renament *ent, |
3708 | int force_reread) | |
bd1af145 MS |
3709 | { |
3710 | int retval; | |
3711 | /* | |
3712 | * ent->de could have moved from under us during htree split, so make | |
3713 | * sure that we are deleting the right entry. We might also be pointing | |
3714 | * to a stale entry in the unused part of ent->bh so just checking inum | |
3715 | * and the name isn't enough. | |
3716 | */ | |
3717 | if (le32_to_cpu(ent->de->inode) != ent->inode->i_ino || | |
3718 | ent->de->name_len != ent->dentry->d_name.len || | |
3719 | strncmp(ent->de->name, ent->dentry->d_name.name, | |
d80d448c DW |
3720 | ent->de->name_len) || |
3721 | force_reread) { | |
bd1af145 MS |
3722 | retval = ext4_find_delete_entry(handle, ent->dir, |
3723 | &ent->dentry->d_name); | |
3724 | } else { | |
3725 | retval = ext4_delete_entry(handle, ent->dir, ent->de, ent->bh); | |
3726 | if (retval == -ENOENT) { | |
3727 | retval = ext4_find_delete_entry(handle, ent->dir, | |
3728 | &ent->dentry->d_name); | |
3729 | } | |
3730 | } | |
3731 | ||
3732 | if (retval) { | |
b03a2f7e AD |
3733 | ext4_warning_inode(ent->dir, |
3734 | "Deleting old file: nlink %d, error=%d", | |
3735 | ent->dir->i_nlink, retval); | |
bd1af145 MS |
3736 | } |
3737 | } | |
3738 | ||
bd42998a MS |
3739 | static void ext4_update_dir_count(handle_t *handle, struct ext4_renament *ent) |
3740 | { | |
3741 | if (ent->dir_nlink_delta) { | |
3742 | if (ent->dir_nlink_delta == -1) | |
15ed2851 | 3743 | ext4_dec_count(ent->dir); |
bd42998a | 3744 | else |
15ed2851 | 3745 | ext4_inc_count(ent->dir); |
bd42998a MS |
3746 | ext4_mark_inode_dirty(handle, ent->dir); |
3747 | } | |
3748 | } | |
3749 | ||
f2d40141 | 3750 | static struct inode *ext4_whiteout_for_rename(struct mnt_idmap *idmap, |
14f3db55 | 3751 | struct ext4_renament *ent, |
cd808dec MS |
3752 | int credits, handle_t **h) |
3753 | { | |
3754 | struct inode *wh; | |
3755 | handle_t *handle; | |
3756 | int retries = 0; | |
3757 | ||
3758 | /* | |
3759 | * for inode block, sb block, group summaries, | |
3760 | * and inode bitmap | |
3761 | */ | |
3762 | credits += (EXT4_MAXQUOTAS_TRANS_BLOCKS(ent->dir->i_sb) + | |
3763 | EXT4_XATTR_TRANS_BLOCKS + 4); | |
3764 | retry: | |
f2d40141 | 3765 | wh = ext4_new_inode_start_handle(idmap, ent->dir, |
14f3db55 | 3766 | S_IFCHR | WHITEOUT_MODE, |
cd808dec MS |
3767 | &ent->dentry->d_name, 0, NULL, |
3768 | EXT4_HT_DIR, credits); | |
3769 | ||
3770 | handle = ext4_journal_current_handle(); | |
3771 | if (IS_ERR(wh)) { | |
3772 | if (handle) | |
3773 | ext4_journal_stop(handle); | |
3774 | if (PTR_ERR(wh) == -ENOSPC && | |
3775 | ext4_should_retry_alloc(ent->dir->i_sb, &retries)) | |
3776 | goto retry; | |
3777 | } else { | |
3778 | *h = handle; | |
3779 | init_special_inode(wh, wh->i_mode, WHITEOUT_DEV); | |
3780 | wh->i_op = &ext4_special_inode_operations; | |
3781 | } | |
3782 | return wh; | |
3783 | } | |
3784 | ||
ac27a0ec DK |
3785 | /* |
3786 | * Anybody can rename anything with this: the permission checks are left to the | |
3787 | * higher-level routines. | |
0e202704 TT |
3788 | * |
3789 | * n.b. old_{dentry,inode) refers to the source dentry/inode | |
3790 | * while new_{dentry,inode) refers to the destination dentry/inode | |
3791 | * This comes from rename(const char *oldpath, const char *newpath) | |
ac27a0ec | 3792 | */ |
f2d40141 | 3793 | static int ext4_rename(struct mnt_idmap *idmap, struct inode *old_dir, |
14f3db55 CB |
3794 | struct dentry *old_dentry, struct inode *new_dir, |
3795 | struct dentry *new_dentry, unsigned int flags) | |
ac27a0ec | 3796 | { |
5b61de75 | 3797 | handle_t *handle = NULL; |
c0d268c3 MS |
3798 | struct ext4_renament old = { |
3799 | .dir = old_dir, | |
3800 | .dentry = old_dentry, | |
2b0143b5 | 3801 | .inode = d_inode(old_dentry), |
c0d268c3 MS |
3802 | }; |
3803 | struct ext4_renament new = { | |
3804 | .dir = new_dir, | |
3805 | .dentry = new_dentry, | |
2b0143b5 | 3806 | .inode = d_inode(new_dentry), |
c0d268c3 | 3807 | }; |
d80d448c | 3808 | int force_reread; |
0e202704 | 3809 | int retval; |
cd808dec MS |
3810 | struct inode *whiteout = NULL; |
3811 | int credits; | |
3812 | u8 old_file_type; | |
907f4554 | 3813 | |
b50282f3 TT |
3814 | if (new.inode && new.inode->i_nlink == 0) { |
3815 | EXT4_ERROR_INODE(new.inode, | |
3816 | "target of rename is already freed"); | |
3817 | return -EFSCORRUPTED; | |
3818 | } | |
3819 | ||
040cb378 LX |
3820 | if ((ext4_test_inode_flag(new_dir, EXT4_INODE_PROJINHERIT)) && |
3821 | (!projid_eq(EXT4_I(new_dir)->i_projid, | |
3822 | EXT4_I(old_dentry->d_inode)->i_projid))) | |
3823 | return -EXDEV; | |
3824 | ||
a7cdadee | 3825 | retval = dquot_initialize(old.dir); |
fae381a3 YB |
3826 | if (retval) |
3827 | return retval; | |
3828 | retval = dquot_initialize(old.inode); | |
a7cdadee JK |
3829 | if (retval) |
3830 | return retval; | |
3831 | retval = dquot_initialize(new.dir); | |
3832 | if (retval) | |
3833 | return retval; | |
ac27a0ec DK |
3834 | |
3835 | /* Initialize quotas before so that eventual writes go | |
3836 | * in separate transaction */ | |
a7cdadee JK |
3837 | if (new.inode) { |
3838 | retval = dquot_initialize(new.inode); | |
3839 | if (retval) | |
3840 | return retval; | |
3841 | } | |
ac27a0ec | 3842 | |
c9f62c8b EW |
3843 | old.bh = ext4_find_entry(old.dir, &old.dentry->d_name, &old.de, |
3844 | &old.inlined); | |
3658840c JK |
3845 | if (IS_ERR(old.bh)) |
3846 | return PTR_ERR(old.bh); | |
3c92792d | 3847 | |
ac27a0ec DK |
3848 | /* |
3849 | * Check for inode number is _not_ due to possible IO errors. | |
3850 | * We might rmdir the source, keep it as pwd of some process | |
3851 | * and merrily kill the link to whatever was created under the | |
3852 | * same name. Goodbye sticky bit ;-< | |
3853 | */ | |
ac27a0ec | 3854 | retval = -ENOENT; |
c0d268c3 | 3855 | if (!old.bh || le32_to_cpu(old.de->inode) != old.inode->i_ino) |
5dccdc5a | 3856 | goto release_bh; |
ac27a0ec | 3857 | |
c0d268c3 MS |
3858 | new.bh = ext4_find_entry(new.dir, &new.dentry->d_name, |
3859 | &new.de, &new.inlined); | |
36de9286 TT |
3860 | if (IS_ERR(new.bh)) { |
3861 | retval = PTR_ERR(new.bh); | |
a9cfcd63 | 3862 | new.bh = NULL; |
5dccdc5a | 3863 | goto release_bh; |
36de9286 | 3864 | } |
c0d268c3 MS |
3865 | if (new.bh) { |
3866 | if (!new.inode) { | |
3867 | brelse(new.bh); | |
3868 | new.bh = NULL; | |
ac27a0ec DK |
3869 | } |
3870 | } | |
c0d268c3 MS |
3871 | if (new.inode && !test_opt(new.dir->i_sb, NO_AUTO_DA_ALLOC)) |
3872 | ext4_alloc_da_blocks(old.inode); | |
5b61de75 | 3873 | |
cd808dec MS |
3874 | credits = (2 * EXT4_DATA_TRANS_BLOCKS(old.dir->i_sb) + |
3875 | EXT4_INDEX_EXTRA_TRANS_BLOCKS + 2); | |
3876 | if (!(flags & RENAME_WHITEOUT)) { | |
3877 | handle = ext4_journal_start(old.dir, EXT4_HT_DIR, credits); | |
7071b715 KK |
3878 | if (IS_ERR(handle)) { |
3879 | retval = PTR_ERR(handle); | |
5dccdc5a | 3880 | goto release_bh; |
7071b715 | 3881 | } |
cd808dec | 3882 | } else { |
f2d40141 | 3883 | whiteout = ext4_whiteout_for_rename(idmap, &old, credits, &handle); |
7071b715 KK |
3884 | if (IS_ERR(whiteout)) { |
3885 | retval = PTR_ERR(whiteout); | |
5dccdc5a | 3886 | goto release_bh; |
7071b715 | 3887 | } |
cd808dec | 3888 | } |
5b61de75 | 3889 | |
6b4b8e6b | 3890 | old_file_type = old.de->file_type; |
c0d268c3 | 3891 | if (IS_DIRSYNC(old.dir) || IS_DIRSYNC(new.dir)) |
5b61de75 TT |
3892 | ext4_handle_sync(handle); |
3893 | ||
c0d268c3 MS |
3894 | if (S_ISDIR(old.inode->i_mode)) { |
3895 | if (new.inode) { | |
ac27a0ec | 3896 | retval = -ENOTEMPTY; |
e875a2dd | 3897 | if (!ext4_empty_dir(new.inode)) |
ac27a0ec | 3898 | goto end_rename; |
0d7d5d67 MS |
3899 | } else { |
3900 | retval = -EMLINK; | |
3901 | if (new.dir != old.dir && EXT4_DIR_LINK_MAX(new.dir)) | |
3902 | goto end_rename; | |
ac27a0ec | 3903 | } |
bd1af145 | 3904 | retval = ext4_rename_dir_prepare(handle, &old); |
70e42fea | 3905 | if (retval) |
ef607893 | 3906 | goto end_rename; |
ac27a0ec | 3907 | } |
d80d448c DW |
3908 | /* |
3909 | * If we're renaming a file within an inline_data dir and adding or | |
3910 | * setting the new dirent causes a conversion from inline_data to | |
3911 | * extents/blockmap, we need to force the dirent delete code to | |
3912 | * re-read the directory, or else we end up trying to delete a dirent | |
3913 | * from what is now the extent tree root (or a block map). | |
3914 | */ | |
3915 | force_reread = (new.dir->i_ino == old.dir->i_ino && | |
3916 | ext4_test_inode_flag(new.dir, EXT4_INODE_INLINE_DATA)); | |
cd808dec | 3917 | |
cd808dec MS |
3918 | if (whiteout) { |
3919 | /* | |
3920 | * Do this before adding a new entry, so the old entry is sure | |
3921 | * to be still pointing to the valid old entry. | |
3922 | */ | |
3923 | retval = ext4_setent(handle, &old, whiteout->i_ino, | |
3924 | EXT4_FT_CHRDEV); | |
3925 | if (retval) | |
3926 | goto end_rename; | |
4209ae12 HS |
3927 | retval = ext4_mark_inode_dirty(handle, whiteout); |
3928 | if (unlikely(retval)) | |
3929 | goto end_rename; | |
8210bb29 | 3930 | |
cd808dec | 3931 | } |
c0d268c3 MS |
3932 | if (!new.bh) { |
3933 | retval = ext4_add_entry(handle, new.dentry, old.inode); | |
ac27a0ec DK |
3934 | if (retval) |
3935 | goto end_rename; | |
3936 | } else { | |
bd1af145 | 3937 | retval = ext4_setent(handle, &new, |
cd808dec | 3938 | old.inode->i_ino, old_file_type); |
ef607893 AG |
3939 | if (retval) |
3940 | goto end_rename; | |
ac27a0ec | 3941 | } |
d80d448c DW |
3942 | if (force_reread) |
3943 | force_reread = !ext4_test_inode_flag(new.dir, | |
3944 | EXT4_INODE_INLINE_DATA); | |
ac27a0ec DK |
3945 | |
3946 | /* | |
3947 | * Like most other Unix systems, set the ctime for inodes on a | |
3948 | * rename. | |
3949 | */ | |
1bc33893 | 3950 | inode_set_ctime_current(old.inode); |
4209ae12 HS |
3951 | retval = ext4_mark_inode_dirty(handle, old.inode); |
3952 | if (unlikely(retval)) | |
3953 | goto end_rename; | |
ac27a0ec | 3954 | |
cd808dec MS |
3955 | if (!whiteout) { |
3956 | /* | |
3957 | * ok, that's it | |
3958 | */ | |
3959 | ext4_rename_delete(handle, &old, force_reread); | |
3960 | } | |
ac27a0ec | 3961 | |
c0d268c3 | 3962 | if (new.inode) { |
15ed2851 | 3963 | ext4_dec_count(new.inode); |
1bc33893 | 3964 | inode_set_ctime_current(new.inode); |
ac27a0ec | 3965 | } |
1bc33893 | 3966 | old.dir->i_mtime = inode_set_ctime_current(old.dir); |
c0d268c3 MS |
3967 | ext4_update_dx_flag(old.dir); |
3968 | if (old.dir_bh) { | |
bd1af145 MS |
3969 | retval = ext4_rename_dir_finish(handle, &old, new.dir->i_ino); |
3970 | if (retval) | |
b4097142 | 3971 | goto end_rename; |
bd1af145 | 3972 | |
15ed2851 | 3973 | ext4_dec_count(old.dir); |
c0d268c3 | 3974 | if (new.inode) { |
e875a2dd MH |
3975 | /* checked ext4_empty_dir above, can't have another |
3976 | * parent, ext4_dec_count() won't work for many-linked | |
3977 | * dirs */ | |
c0d268c3 | 3978 | clear_nlink(new.inode); |
ac27a0ec | 3979 | } else { |
15ed2851 | 3980 | ext4_inc_count(new.dir); |
c0d268c3 | 3981 | ext4_update_dx_flag(new.dir); |
4209ae12 HS |
3982 | retval = ext4_mark_inode_dirty(handle, new.dir); |
3983 | if (unlikely(retval)) | |
3984 | goto end_rename; | |
ac27a0ec DK |
3985 | } |
3986 | } | |
4209ae12 HS |
3987 | retval = ext4_mark_inode_dirty(handle, old.dir); |
3988 | if (unlikely(retval)) | |
3989 | goto end_rename; | |
aa75f4d3 HS |
3990 | |
3991 | if (S_ISDIR(old.inode->i_mode)) { | |
3992 | /* | |
3993 | * We disable fast commits here that's because the | |
3994 | * replay code is not yet capable of changing dot dot | |
3995 | * dirents in directories. | |
3996 | */ | |
3997 | ext4_fc_mark_ineligible(old.inode->i_sb, | |
e85c81ba | 3998 | EXT4_FC_REASON_RENAME_DIR, handle); |
aa75f4d3 | 3999 | } else { |
78be0471 RH |
4000 | struct super_block *sb = old.inode->i_sb; |
4001 | ||
aa75f4d3 | 4002 | if (new.inode) |
a80f7fcf | 4003 | ext4_fc_track_unlink(handle, new.dentry); |
78be0471 RH |
4004 | if (test_opt2(sb, JOURNAL_FAST_COMMIT) && |
4005 | !(EXT4_SB(sb)->s_mount_state & EXT4_FC_REPLAY) && | |
4006 | !(ext4_test_mount_flag(sb, EXT4_MF_FC_INELIGIBLE))) { | |
4007 | __ext4_fc_track_link(handle, old.inode, new.dentry); | |
4008 | __ext4_fc_track_unlink(handle, old.inode, old.dentry); | |
4009 | if (whiteout) | |
4010 | __ext4_fc_track_create(handle, whiteout, | |
4011 | old.dentry); | |
4012 | } | |
aa75f4d3 HS |
4013 | } |
4014 | ||
c0d268c3 | 4015 | if (new.inode) { |
4209ae12 HS |
4016 | retval = ext4_mark_inode_dirty(handle, new.inode); |
4017 | if (unlikely(retval)) | |
4018 | goto end_rename; | |
c0d268c3 MS |
4019 | if (!new.inode->i_nlink) |
4020 | ext4_orphan_add(handle, new.inode); | |
ac27a0ec DK |
4021 | } |
4022 | retval = 0; | |
4023 | ||
4024 | end_rename: | |
cd808dec | 4025 | if (whiteout) { |
6b4b8e6b | 4026 | if (retval) { |
b7ff91fd | 4027 | ext4_resetent(handle, &old, |
4028 | old.inode->i_ino, old_file_type); | |
cd808dec | 4029 | drop_nlink(whiteout); |
15247734 | 4030 | ext4_mark_inode_dirty(handle, whiteout); |
5dccdc5a | 4031 | ext4_orphan_add(handle, whiteout); |
6b4b8e6b | 4032 | } |
cd808dec | 4033 | unlock_new_inode(whiteout); |
5dccdc5a | 4034 | ext4_journal_stop(handle); |
cd808dec | 4035 | iput(whiteout); |
5dccdc5a | 4036 | } else { |
4037 | ext4_journal_stop(handle); | |
cd808dec | 4038 | } |
5dccdc5a | 4039 | release_bh: |
6b4b8e6b | 4040 | brelse(old.dir_bh); |
4041 | brelse(old.bh); | |
4042 | brelse(new.bh); | |
3c92792d | 4043 | |
ac27a0ec DK |
4044 | return retval; |
4045 | } | |
4046 | ||
bd42998a MS |
4047 | static int ext4_cross_rename(struct inode *old_dir, struct dentry *old_dentry, |
4048 | struct inode *new_dir, struct dentry *new_dentry) | |
4049 | { | |
4050 | handle_t *handle = NULL; | |
4051 | struct ext4_renament old = { | |
4052 | .dir = old_dir, | |
4053 | .dentry = old_dentry, | |
2b0143b5 | 4054 | .inode = d_inode(old_dentry), |
bd42998a MS |
4055 | }; |
4056 | struct ext4_renament new = { | |
4057 | .dir = new_dir, | |
4058 | .dentry = new_dentry, | |
2b0143b5 | 4059 | .inode = d_inode(new_dentry), |
bd42998a MS |
4060 | }; |
4061 | u8 new_file_type; | |
4062 | int retval; | |
4063 | ||
040cb378 LX |
4064 | if ((ext4_test_inode_flag(new_dir, EXT4_INODE_PROJINHERIT) && |
4065 | !projid_eq(EXT4_I(new_dir)->i_projid, | |
4066 | EXT4_I(old_dentry->d_inode)->i_projid)) || | |
4067 | (ext4_test_inode_flag(old_dir, EXT4_INODE_PROJINHERIT) && | |
4068 | !projid_eq(EXT4_I(old_dir)->i_projid, | |
4069 | EXT4_I(new_dentry->d_inode)->i_projid))) | |
4070 | return -EXDEV; | |
4071 | ||
a7cdadee JK |
4072 | retval = dquot_initialize(old.dir); |
4073 | if (retval) | |
4074 | return retval; | |
4075 | retval = dquot_initialize(new.dir); | |
4076 | if (retval) | |
4077 | return retval; | |
bd42998a MS |
4078 | |
4079 | old.bh = ext4_find_entry(old.dir, &old.dentry->d_name, | |
4080 | &old.de, &old.inlined); | |
36de9286 TT |
4081 | if (IS_ERR(old.bh)) |
4082 | return PTR_ERR(old.bh); | |
bd42998a MS |
4083 | /* |
4084 | * Check for inode number is _not_ due to possible IO errors. | |
4085 | * We might rmdir the source, keep it as pwd of some process | |
4086 | * and merrily kill the link to whatever was created under the | |
4087 | * same name. Goodbye sticky bit ;-< | |
4088 | */ | |
4089 | retval = -ENOENT; | |
4090 | if (!old.bh || le32_to_cpu(old.de->inode) != old.inode->i_ino) | |
4091 | goto end_rename; | |
4092 | ||
4093 | new.bh = ext4_find_entry(new.dir, &new.dentry->d_name, | |
4094 | &new.de, &new.inlined); | |
36de9286 TT |
4095 | if (IS_ERR(new.bh)) { |
4096 | retval = PTR_ERR(new.bh); | |
a9cfcd63 | 4097 | new.bh = NULL; |
36de9286 TT |
4098 | goto end_rename; |
4099 | } | |
bd42998a MS |
4100 | |
4101 | /* RENAME_EXCHANGE case: old *and* new must both exist */ | |
4102 | if (!new.bh || le32_to_cpu(new.de->inode) != new.inode->i_ino) | |
4103 | goto end_rename; | |
4104 | ||
4105 | handle = ext4_journal_start(old.dir, EXT4_HT_DIR, | |
4106 | (2 * EXT4_DATA_TRANS_BLOCKS(old.dir->i_sb) + | |
4107 | 2 * EXT4_INDEX_EXTRA_TRANS_BLOCKS + 2)); | |
7071b715 KK |
4108 | if (IS_ERR(handle)) { |
4109 | retval = PTR_ERR(handle); | |
4110 | handle = NULL; | |
4111 | goto end_rename; | |
4112 | } | |
bd42998a MS |
4113 | |
4114 | if (IS_DIRSYNC(old.dir) || IS_DIRSYNC(new.dir)) | |
4115 | ext4_handle_sync(handle); | |
4116 | ||
4117 | if (S_ISDIR(old.inode->i_mode)) { | |
4118 | old.is_dir = true; | |
4119 | retval = ext4_rename_dir_prepare(handle, &old); | |
4120 | if (retval) | |
4121 | goto end_rename; | |
4122 | } | |
4123 | if (S_ISDIR(new.inode->i_mode)) { | |
4124 | new.is_dir = true; | |
4125 | retval = ext4_rename_dir_prepare(handle, &new); | |
4126 | if (retval) | |
4127 | goto end_rename; | |
4128 | } | |
4129 | ||
4130 | /* | |
4131 | * Other than the special case of overwriting a directory, parents' | |
4132 | * nlink only needs to be modified if this is a cross directory rename. | |
4133 | */ | |
4134 | if (old.dir != new.dir && old.is_dir != new.is_dir) { | |
4135 | old.dir_nlink_delta = old.is_dir ? -1 : 1; | |
4136 | new.dir_nlink_delta = -old.dir_nlink_delta; | |
4137 | retval = -EMLINK; | |
4138 | if ((old.dir_nlink_delta > 0 && EXT4_DIR_LINK_MAX(old.dir)) || | |
4139 | (new.dir_nlink_delta > 0 && EXT4_DIR_LINK_MAX(new.dir))) | |
4140 | goto end_rename; | |
4141 | } | |
4142 | ||
4143 | new_file_type = new.de->file_type; | |
4144 | retval = ext4_setent(handle, &new, old.inode->i_ino, old.de->file_type); | |
4145 | if (retval) | |
4146 | goto end_rename; | |
4147 | ||
4148 | retval = ext4_setent(handle, &old, new.inode->i_ino, new_file_type); | |
4149 | if (retval) | |
4150 | goto end_rename; | |
4151 | ||
4152 | /* | |
4153 | * Like most other Unix systems, set the ctime for inodes on a | |
4154 | * rename. | |
4155 | */ | |
1bc33893 JL |
4156 | inode_set_ctime_current(old.inode); |
4157 | inode_set_ctime_current(new.inode); | |
4209ae12 HS |
4158 | retval = ext4_mark_inode_dirty(handle, old.inode); |
4159 | if (unlikely(retval)) | |
4160 | goto end_rename; | |
4161 | retval = ext4_mark_inode_dirty(handle, new.inode); | |
4162 | if (unlikely(retval)) | |
4163 | goto end_rename; | |
aa75f4d3 | 4164 | ext4_fc_mark_ineligible(new.inode->i_sb, |
e85c81ba | 4165 | EXT4_FC_REASON_CROSS_RENAME, handle); |
bd42998a MS |
4166 | if (old.dir_bh) { |
4167 | retval = ext4_rename_dir_finish(handle, &old, new.dir->i_ino); | |
4168 | if (retval) | |
4169 | goto end_rename; | |
4170 | } | |
4171 | if (new.dir_bh) { | |
4172 | retval = ext4_rename_dir_finish(handle, &new, old.dir->i_ino); | |
4173 | if (retval) | |
4174 | goto end_rename; | |
4175 | } | |
4176 | ext4_update_dir_count(handle, &old); | |
4177 | ext4_update_dir_count(handle, &new); | |
4178 | retval = 0; | |
4179 | ||
4180 | end_rename: | |
4181 | brelse(old.dir_bh); | |
4182 | brelse(new.dir_bh); | |
4183 | brelse(old.bh); | |
4184 | brelse(new.bh); | |
4185 | if (handle) | |
4186 | ext4_journal_stop(handle); | |
4187 | return retval; | |
4188 | } | |
4189 | ||
e18275ae | 4190 | static int ext4_rename2(struct mnt_idmap *idmap, |
549c7297 | 4191 | struct inode *old_dir, struct dentry *old_dentry, |
0a7c3937 MS |
4192 | struct inode *new_dir, struct dentry *new_dentry, |
4193 | unsigned int flags) | |
4194 | { | |
07543d16 EB |
4195 | int err; |
4196 | ||
eb8ab444 | 4197 | if (unlikely(ext4_forced_shutdown(old_dir->i_sb))) |
0db1ff22 TT |
4198 | return -EIO; |
4199 | ||
cd808dec | 4200 | if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT)) |
0a7c3937 MS |
4201 | return -EINVAL; |
4202 | ||
07543d16 EB |
4203 | err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry, |
4204 | flags); | |
4205 | if (err) | |
4206 | return err; | |
4207 | ||
bd42998a MS |
4208 | if (flags & RENAME_EXCHANGE) { |
4209 | return ext4_cross_rename(old_dir, old_dentry, | |
4210 | new_dir, new_dentry); | |
4211 | } | |
cd808dec | 4212 | |
f2d40141 | 4213 | return ext4_rename(idmap, old_dir, old_dentry, new_dir, new_dentry, flags); |
0a7c3937 MS |
4214 | } |
4215 | ||
ac27a0ec DK |
4216 | /* |
4217 | * directories can handle most operations... | |
4218 | */ | |
754661f1 | 4219 | const struct inode_operations ext4_dir_inode_operations = { |
617ba13b MC |
4220 | .create = ext4_create, |
4221 | .lookup = ext4_lookup, | |
4222 | .link = ext4_link, | |
4223 | .unlink = ext4_unlink, | |
4224 | .symlink = ext4_symlink, | |
4225 | .mkdir = ext4_mkdir, | |
4226 | .rmdir = ext4_rmdir, | |
4227 | .mknod = ext4_mknod, | |
af51a2ac | 4228 | .tmpfile = ext4_tmpfile, |
2773bf00 | 4229 | .rename = ext4_rename2, |
617ba13b | 4230 | .setattr = ext4_setattr, |
99652ea5 | 4231 | .getattr = ext4_getattr, |
617ba13b | 4232 | .listxattr = ext4_listxattr, |
cac2f8b8 | 4233 | .get_inode_acl = ext4_get_acl, |
64e178a7 | 4234 | .set_acl = ext4_set_acl, |
abc8746e | 4235 | .fiemap = ext4_fiemap, |
4db5c2e6 MS |
4236 | .fileattr_get = ext4_fileattr_get, |
4237 | .fileattr_set = ext4_fileattr_set, | |
ac27a0ec DK |
4238 | }; |
4239 | ||
754661f1 | 4240 | const struct inode_operations ext4_special_inode_operations = { |
617ba13b | 4241 | .setattr = ext4_setattr, |
99652ea5 | 4242 | .getattr = ext4_getattr, |
617ba13b | 4243 | .listxattr = ext4_listxattr, |
cac2f8b8 | 4244 | .get_inode_acl = ext4_get_acl, |
64e178a7 | 4245 | .set_acl = ext4_set_acl, |
ac27a0ec | 4246 | }; |