Commit | Line | Data |
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0b61f8a4 | 1 | // SPDX-License-Identifier: GPL-2.0 |
4a8af273 DC |
2 | /* |
3 | * Copyright (c) 2000-2005 Silicon Graphics, Inc. | |
4 | * Copyright (c) 2013 Red Hat, Inc. | |
5 | * All Rights Reserved. | |
4a8af273 DC |
6 | */ |
7 | #include "xfs.h" | |
8 | #include "xfs_fs.h" | |
5467b34b | 9 | #include "xfs_shared.h" |
a4fbe6ab | 10 | #include "xfs_format.h" |
239880ef DC |
11 | #include "xfs_log_format.h" |
12 | #include "xfs_trans_resv.h" | |
4a8af273 | 13 | #include "xfs_mount.h" |
4a8af273 | 14 | #include "xfs_inode.h" |
2b9ab5ab | 15 | #include "xfs_dir2.h" |
4a8af273 | 16 | #include "xfs_dir2_priv.h" |
4a8af273 DC |
17 | #include "xfs_trace.h" |
18 | #include "xfs_bmap.h" | |
239880ef | 19 | #include "xfs_trans.h" |
04df34ac | 20 | #include "xfs_error.h" |
4a8af273 | 21 | |
0cb97766 DC |
22 | /* |
23 | * Directory file type support functions | |
24 | */ | |
25 | static unsigned char xfs_dir3_filetype_table[] = { | |
26 | DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, | |
27 | DT_FIFO, DT_SOCK, DT_LNK, DT_WHT, | |
28 | }; | |
29 | ||
a5c46e5e | 30 | unsigned char |
0cb97766 DC |
31 | xfs_dir3_get_dtype( |
32 | struct xfs_mount *mp, | |
c8ce540d | 33 | uint8_t filetype) |
0cb97766 | 34 | { |
38c26bfd | 35 | if (!xfs_has_ftype(mp)) |
0cb97766 DC |
36 | return DT_UNKNOWN; |
37 | ||
38 | if (filetype >= XFS_DIR3_FT_MAX) | |
39 | return DT_UNKNOWN; | |
40 | ||
41 | return xfs_dir3_filetype_table[filetype]; | |
42 | } | |
0cb97766 | 43 | |
4a8af273 DC |
44 | STATIC int |
45 | xfs_dir2_sf_getdents( | |
53f82db0 | 46 | struct xfs_da_args *args, |
4a8af273 DC |
47 | struct dir_context *ctx) |
48 | { | |
49 | int i; /* shortform entry number */ | |
53f82db0 | 50 | struct xfs_inode *dp = args->dp; /* incore directory inode */ |
50f6bb6b | 51 | struct xfs_mount *mp = dp->i_mount; |
4a8af273 DC |
52 | xfs_dir2_dataptr_t off; /* current entry's offset */ |
53 | xfs_dir2_sf_entry_t *sfep; /* shortform directory entry */ | |
54 | xfs_dir2_sf_hdr_t *sfp; /* shortform structure */ | |
55 | xfs_dir2_dataptr_t dot_offset; | |
56 | xfs_dir2_dataptr_t dotdot_offset; | |
57 | xfs_ino_t ino; | |
53f82db0 | 58 | struct xfs_da_geometry *geo = args->geo; |
4a8af273 | 59 | |
0779f4a6 | 60 | ASSERT(dp->i_df.if_format == XFS_DINODE_FMT_LOCAL); |
13d2c10b | 61 | ASSERT(dp->i_df.if_bytes == dp->i_disk_size); |
4a8af273 DC |
62 | ASSERT(dp->i_df.if_u1.if_data != NULL); |
63 | ||
64 | sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data; | |
65 | ||
4a8af273 DC |
66 | /* |
67 | * If the block number in the offset is out of range, we're done. | |
68 | */ | |
7dda6e86 | 69 | if (xfs_dir2_dataptr_to_db(geo, ctx->pos) > geo->datablk) |
4a8af273 DC |
70 | return 0; |
71 | ||
72 | /* | |
16823104 CH |
73 | * Precalculate offsets for "." and ".." as we will always need them. |
74 | * This relies on the fact that directories always start with the | |
75 | * entries for "." and "..". | |
4a8af273 | 76 | */ |
7dda6e86 | 77 | dot_offset = xfs_dir2_db_off_to_dataptr(geo, geo->datablk, |
d73e1cee | 78 | geo->data_entry_offset); |
7dda6e86 | 79 | dotdot_offset = xfs_dir2_db_off_to_dataptr(geo, geo->datablk, |
d73e1cee | 80 | geo->data_entry_offset + |
fdbb8c5b | 81 | xfs_dir2_data_entsize(mp, sizeof(".") - 1)); |
4a8af273 DC |
82 | |
83 | /* | |
84 | * Put . entry unless we're starting past it. | |
85 | */ | |
86 | if (ctx->pos <= dot_offset) { | |
87 | ctx->pos = dot_offset & 0x7fffffff; | |
88 | if (!dir_emit(ctx, ".", 1, dp->i_ino, DT_DIR)) | |
89 | return 0; | |
90 | } | |
91 | ||
92 | /* | |
93 | * Put .. entry unless we're starting past it. | |
94 | */ | |
95 | if (ctx->pos <= dotdot_offset) { | |
84915e1b | 96 | ino = xfs_dir2_sf_get_parent_ino(sfp); |
4a8af273 DC |
97 | ctx->pos = dotdot_offset & 0x7fffffff; |
98 | if (!dir_emit(ctx, "..", 2, ino, DT_DIR)) | |
99 | return 0; | |
100 | } | |
101 | ||
102 | /* | |
103 | * Loop while there are more entries and put'ing works. | |
104 | */ | |
105 | sfep = xfs_dir2_sf_firstentry(sfp); | |
106 | for (i = 0; i < sfp->count; i++) { | |
c8ce540d | 107 | uint8_t filetype; |
0cb97766 | 108 | |
7dda6e86 | 109 | off = xfs_dir2_db_off_to_dataptr(geo, geo->datablk, |
4a8af273 DC |
110 | xfs_dir2_sf_get_offset(sfep)); |
111 | ||
112 | if (ctx->pos > off) { | |
50f6bb6b | 113 | sfep = xfs_dir2_sf_nextentry(mp, sfp, sfep); |
4a8af273 DC |
114 | continue; |
115 | } | |
116 | ||
93b1e96a | 117 | ino = xfs_dir2_sf_get_ino(mp, sfp, sfep); |
4501ed2a | 118 | filetype = xfs_dir2_sf_get_ftype(mp, sfep); |
4a8af273 | 119 | ctx->pos = off & 0x7fffffff; |
a71895c5 DW |
120 | if (XFS_IS_CORRUPT(dp->i_mount, |
121 | !xfs_dir2_namecheck(sfep->name, | |
122 | sfep->namelen))) | |
04df34ac | 123 | return -EFSCORRUPTED; |
0cb97766 | 124 | if (!dir_emit(ctx, (char *)sfep->name, sfep->namelen, ino, |
50f6bb6b | 125 | xfs_dir3_get_dtype(mp, filetype))) |
4a8af273 | 126 | return 0; |
50f6bb6b | 127 | sfep = xfs_dir2_sf_nextentry(mp, sfp, sfep); |
4a8af273 DC |
128 | } |
129 | ||
7dda6e86 | 130 | ctx->pos = xfs_dir2_db_off_to_dataptr(geo, geo->datablk + 1, 0) & |
53f82db0 | 131 | 0x7fffffff; |
4a8af273 DC |
132 | return 0; |
133 | } | |
134 | ||
135 | /* | |
136 | * Readdir for block directories. | |
137 | */ | |
138 | STATIC int | |
139 | xfs_dir2_block_getdents( | |
53f82db0 | 140 | struct xfs_da_args *args, |
65552b02 DW |
141 | struct dir_context *ctx, |
142 | unsigned int *lock_mode) | |
4a8af273 | 143 | { |
53f82db0 | 144 | struct xfs_inode *dp = args->dp; /* incore directory inode */ |
4a8af273 | 145 | struct xfs_buf *bp; /* buffer for block */ |
4a8af273 | 146 | int error; /* error return value */ |
4a8af273 DC |
147 | int wantoff; /* starting block offset */ |
148 | xfs_off_t cook; | |
53f82db0 | 149 | struct xfs_da_geometry *geo = args->geo; |
3d28e7e2 | 150 | unsigned int offset, next_offset; |
263dde86 | 151 | unsigned int end; |
4a8af273 | 152 | |
4a8af273 DC |
153 | /* |
154 | * If the block number in the offset is out of range, we're done. | |
155 | */ | |
7dda6e86 | 156 | if (xfs_dir2_dataptr_to_db(geo, ctx->pos) > geo->datablk) |
4a8af273 DC |
157 | return 0; |
158 | ||
acb9553c | 159 | error = xfs_dir3_block_read(args->trans, dp, &bp); |
4a8af273 DC |
160 | if (error) |
161 | return error; | |
162 | ||
65552b02 DW |
163 | xfs_iunlock(dp, *lock_mode); |
164 | *lock_mode = 0; | |
165 | ||
4a8af273 DC |
166 | /* |
167 | * Extract the byte offset we start at from the seek pointer. | |
168 | * We'll skip entries before this. | |
169 | */ | |
30028030 | 170 | wantoff = xfs_dir2_dataptr_to_off(geo, ctx->pos); |
4a8af273 | 171 | xfs_dir3_data_check(dp, bp); |
4a8af273 DC |
172 | |
173 | /* | |
174 | * Loop over the data portion of the block. | |
175 | * Each object is a real entry (dep) or an unused one (dup). | |
176 | */ | |
5c072127 | 177 | end = xfs_dir3_data_end_offset(geo, bp->b_addr); |
3d28e7e2 TR |
178 | for (offset = geo->data_entry_offset; |
179 | offset < end; | |
180 | offset = next_offset) { | |
263dde86 CH |
181 | struct xfs_dir2_data_unused *dup = bp->b_addr + offset; |
182 | struct xfs_dir2_data_entry *dep = bp->b_addr + offset; | |
c8ce540d | 183 | uint8_t filetype; |
0cb97766 | 184 | |
4a8af273 DC |
185 | /* |
186 | * Unused, skip it. | |
187 | */ | |
188 | if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) { | |
3d28e7e2 | 189 | next_offset = offset + be16_to_cpu(dup->length); |
4a8af273 DC |
190 | continue; |
191 | } | |
192 | ||
4a8af273 DC |
193 | /* |
194 | * Bump pointer for the next iteration. | |
195 | */ | |
3d28e7e2 TR |
196 | next_offset = offset + |
197 | xfs_dir2_data_entsize(dp->i_mount, dep->namelen); | |
263dde86 | 198 | |
4a8af273 DC |
199 | /* |
200 | * The entry is before the desired starting point, skip it. | |
201 | */ | |
263dde86 | 202 | if (offset < wantoff) |
4a8af273 DC |
203 | continue; |
204 | ||
263dde86 | 205 | cook = xfs_dir2_db_off_to_dataptr(geo, geo->datablk, offset); |
4a8af273 DC |
206 | |
207 | ctx->pos = cook & 0x7fffffff; | |
59b8b465 | 208 | filetype = xfs_dir2_data_get_ftype(dp->i_mount, dep); |
4a8af273 DC |
209 | /* |
210 | * If it didn't fit, set the final offset to here & return. | |
211 | */ | |
a71895c5 DW |
212 | if (XFS_IS_CORRUPT(dp->i_mount, |
213 | !xfs_dir2_namecheck(dep->name, | |
214 | dep->namelen))) { | |
04df34ac DW |
215 | error = -EFSCORRUPTED; |
216 | goto out_rele; | |
217 | } | |
4a8af273 | 218 | if (!dir_emit(ctx, (char *)dep->name, dep->namelen, |
0cb97766 | 219 | be64_to_cpu(dep->inumber), |
04df34ac DW |
220 | xfs_dir3_get_dtype(dp->i_mount, filetype))) |
221 | goto out_rele; | |
4a8af273 DC |
222 | } |
223 | ||
224 | /* | |
225 | * Reached the end of the block. | |
226 | * Set the offset to a non-existent block 1 and return. | |
227 | */ | |
7dda6e86 | 228 | ctx->pos = xfs_dir2_db_off_to_dataptr(geo, geo->datablk + 1, 0) & |
53f82db0 | 229 | 0x7fffffff; |
04df34ac | 230 | out_rele: |
acb9553c | 231 | xfs_trans_brelse(args->trans, bp); |
04df34ac | 232 | return error; |
4a8af273 DC |
233 | } |
234 | ||
d205a7d0 DW |
235 | /* |
236 | * Read a directory block and initiate readahead for blocks beyond that. | |
237 | * We maintain a sliding readahead window of the remaining space in the | |
238 | * buffer rounded up to the nearest block. | |
239 | */ | |
4a8af273 DC |
240 | STATIC int |
241 | xfs_dir2_leaf_readbuf( | |
53f82db0 | 242 | struct xfs_da_args *args, |
4a8af273 | 243 | size_t bufsize, |
d205a7d0 DW |
244 | xfs_dir2_off_t *cur_off, |
245 | xfs_dablk_t *ra_blk, | |
246 | struct xfs_buf **bpp) | |
4a8af273 | 247 | { |
53f82db0 | 248 | struct xfs_inode *dp = args->dp; |
9f541801 | 249 | struct xfs_buf *bp = NULL; |
d205a7d0 | 250 | struct xfs_da_geometry *geo = args->geo; |
732436ef | 251 | struct xfs_ifork *ifp = xfs_ifork_ptr(dp, XFS_DATA_FORK); |
d205a7d0 | 252 | struct xfs_bmbt_irec map; |
4a8af273 | 253 | struct blk_plug plug; |
d205a7d0 DW |
254 | xfs_dir2_off_t new_off; |
255 | xfs_dablk_t next_ra; | |
256 | xfs_dablk_t map_off; | |
257 | xfs_dablk_t last_da; | |
b2b1712a | 258 | struct xfs_iext_cursor icur; |
d205a7d0 | 259 | int ra_want; |
4a8af273 | 260 | int error = 0; |
4a8af273 | 261 | |
862a804a CH |
262 | error = xfs_iread_extents(args->trans, dp, XFS_DATA_FORK); |
263 | if (error) | |
264 | goto out; | |
4a8af273 DC |
265 | |
266 | /* | |
d205a7d0 DW |
267 | * Look for mapped directory blocks at or above the current offset. |
268 | * Truncate down to the nearest directory block to start the scanning | |
269 | * operation. | |
4a8af273 | 270 | */ |
d205a7d0 DW |
271 | last_da = xfs_dir2_byte_to_da(geo, XFS_DIR2_LEAF_OFFSET); |
272 | map_off = xfs_dir2_db_to_da(geo, xfs_dir2_byte_to_db(geo, *cur_off)); | |
b2b1712a | 273 | if (!xfs_iext_lookup_extent(dp, ifp, map_off, &icur, &map)) |
4a8af273 | 274 | goto out; |
d205a7d0 DW |
275 | if (map.br_startoff >= last_da) |
276 | goto out; | |
277 | xfs_trim_extent(&map, map_off, last_da - map_off); | |
4a8af273 | 278 | |
d205a7d0 DW |
279 | /* Read the directory block of that first mapping. */ |
280 | new_off = xfs_dir2_da_to_byte(geo, map.br_startoff); | |
281 | if (new_off > *cur_off) | |
282 | *cur_off = new_off; | |
cd2c9f1b | 283 | error = xfs_dir3_data_read(args->trans, dp, map.br_startoff, 0, &bp); |
4a8af273 | 284 | if (error) |
d205a7d0 | 285 | goto out; |
4a8af273 DC |
286 | |
287 | /* | |
d205a7d0 DW |
288 | * Start readahead for the next bufsize's worth of dir data blocks. |
289 | * We may have already issued readahead for some of that range; | |
290 | * ra_blk tracks the last block we tried to read(ahead). | |
4a8af273 | 291 | */ |
d205a7d0 DW |
292 | ra_want = howmany(bufsize + geo->blksize, (1 << geo->fsblog)); |
293 | if (*ra_blk >= last_da) | |
294 | goto out; | |
295 | else if (*ra_blk == 0) | |
296 | *ra_blk = map.br_startoff; | |
297 | next_ra = map.br_startoff + geo->fsbcount; | |
298 | if (next_ra >= last_da) | |
299 | goto out_no_ra; | |
300 | if (map.br_blockcount < geo->fsbcount && | |
b2b1712a | 301 | !xfs_iext_next_extent(ifp, &icur, &map)) |
d205a7d0 DW |
302 | goto out_no_ra; |
303 | if (map.br_startoff >= last_da) | |
304 | goto out_no_ra; | |
305 | xfs_trim_extent(&map, next_ra, last_da - next_ra); | |
306 | ||
307 | /* Start ra for each dir (not fs) block that has a mapping. */ | |
4a8af273 | 308 | blk_start_plug(&plug); |
d205a7d0 DW |
309 | while (ra_want > 0) { |
310 | next_ra = roundup((xfs_dablk_t)map.br_startoff, geo->fsbcount); | |
311 | while (ra_want > 0 && | |
312 | next_ra < map.br_startoff + map.br_blockcount) { | |
313 | if (next_ra >= last_da) { | |
314 | *ra_blk = last_da; | |
315 | break; | |
316 | } | |
317 | if (next_ra > *ra_blk) { | |
06566fda CH |
318 | xfs_dir3_data_readahead(dp, next_ra, |
319 | XFS_DABUF_MAP_HOLE_OK); | |
d205a7d0 | 320 | *ra_blk = next_ra; |
4a8af273 | 321 | } |
d205a7d0 DW |
322 | ra_want -= geo->fsbcount; |
323 | next_ra += geo->fsbcount; | |
324 | } | |
b2b1712a | 325 | if (!xfs_iext_next_extent(ifp, &icur, &map)) { |
d205a7d0 DW |
326 | *ra_blk = last_da; |
327 | break; | |
4a8af273 DC |
328 | } |
329 | } | |
330 | blk_finish_plug(&plug); | |
331 | ||
332 | out: | |
333 | *bpp = bp; | |
334 | return error; | |
d205a7d0 DW |
335 | out_no_ra: |
336 | *ra_blk = last_da; | |
337 | goto out; | |
4a8af273 DC |
338 | } |
339 | ||
340 | /* | |
341 | * Getdents (readdir) for leaf and node directories. | |
342 | * This reads the data blocks only, so is the same for both forms. | |
343 | */ | |
344 | STATIC int | |
345 | xfs_dir2_leaf_getdents( | |
53f82db0 | 346 | struct xfs_da_args *args, |
4a8af273 | 347 | struct dir_context *ctx, |
65552b02 DW |
348 | size_t bufsize, |
349 | unsigned int *lock_mode) | |
4a8af273 | 350 | { |
53f82db0 | 351 | struct xfs_inode *dp = args->dp; |
fdbb8c5b | 352 | struct xfs_mount *mp = dp->i_mount; |
4a8af273 | 353 | struct xfs_buf *bp = NULL; /* data block buffer */ |
4a8af273 DC |
354 | xfs_dir2_data_entry_t *dep; /* data entry */ |
355 | xfs_dir2_data_unused_t *dup; /* unused entry */ | |
53f82db0 | 356 | struct xfs_da_geometry *geo = args->geo; |
d205a7d0 DW |
357 | xfs_dablk_t rablk = 0; /* current readahead block */ |
358 | xfs_dir2_off_t curoff; /* current overall offset */ | |
359 | int length; /* temporary length value */ | |
360 | int byteoff; /* offset in current block */ | |
2f4369a8 | 361 | unsigned int offset = 0; |
d205a7d0 | 362 | int error = 0; /* error return value */ |
4a8af273 DC |
363 | |
364 | /* | |
365 | * If the offset is at or past the largest allowed value, | |
366 | * give up right away. | |
367 | */ | |
368 | if (ctx->pos >= XFS_DIR2_MAX_DATAPTR) | |
369 | return 0; | |
370 | ||
4a8af273 DC |
371 | /* |
372 | * Inside the loop we keep the main offset value as a byte offset | |
373 | * in the directory file. | |
374 | */ | |
25994053 | 375 | curoff = xfs_dir2_dataptr_to_byte(ctx->pos); |
4a8af273 | 376 | |
4a8af273 DC |
377 | /* |
378 | * Loop over directory entries until we reach the end offset. | |
379 | * Get more blocks and readahead as necessary. | |
380 | */ | |
381 | while (curoff < XFS_DIR2_LEAF_OFFSET) { | |
c8ce540d | 382 | uint8_t filetype; |
0cb97766 | 383 | |
4a8af273 DC |
384 | /* |
385 | * If we have no buffer, or we're off the end of the | |
386 | * current buffer, need to get another one. | |
387 | */ | |
2f4369a8 | 388 | if (!bp || offset >= geo->blksize) { |
9f541801 | 389 | if (bp) { |
d205a7d0 | 390 | xfs_trans_brelse(args->trans, bp); |
9f541801 | 391 | bp = NULL; |
9f541801 | 392 | } |
4a8af273 | 393 | |
65552b02 DW |
394 | if (*lock_mode == 0) |
395 | *lock_mode = xfs_ilock_data_map_shared(dp); | |
d205a7d0 DW |
396 | error = xfs_dir2_leaf_readbuf(args, bufsize, &curoff, |
397 | &rablk, &bp); | |
d205a7d0 | 398 | if (error || !bp) |
4a8af273 DC |
399 | break; |
400 | ||
65552b02 DW |
401 | xfs_iunlock(dp, *lock_mode); |
402 | *lock_mode = 0; | |
403 | ||
4a8af273 DC |
404 | xfs_dir3_data_check(dp, bp); |
405 | /* | |
406 | * Find our position in the block. | |
407 | */ | |
d73e1cee | 408 | offset = geo->data_entry_offset; |
53f82db0 | 409 | byteoff = xfs_dir2_byte_to_off(geo, curoff); |
4a8af273 DC |
410 | /* |
411 | * Skip past the header. | |
412 | */ | |
413 | if (byteoff == 0) | |
d73e1cee | 414 | curoff += geo->data_entry_offset; |
4a8af273 DC |
415 | /* |
416 | * Skip past entries until we reach our offset. | |
417 | */ | |
418 | else { | |
2f4369a8 CH |
419 | while (offset < byteoff) { |
420 | dup = bp->b_addr + offset; | |
4a8af273 DC |
421 | |
422 | if (be16_to_cpu(dup->freetag) | |
423 | == XFS_DIR2_DATA_FREE_TAG) { | |
424 | ||
425 | length = be16_to_cpu(dup->length); | |
2f4369a8 | 426 | offset += length; |
4a8af273 DC |
427 | continue; |
428 | } | |
2f4369a8 | 429 | dep = bp->b_addr + offset; |
fdbb8c5b CH |
430 | length = xfs_dir2_data_entsize(mp, |
431 | dep->namelen); | |
2f4369a8 | 432 | offset += length; |
4a8af273 DC |
433 | } |
434 | /* | |
435 | * Now set our real offset. | |
436 | */ | |
437 | curoff = | |
30028030 DC |
438 | xfs_dir2_db_off_to_byte(geo, |
439 | xfs_dir2_byte_to_db(geo, curoff), | |
2f4369a8 CH |
440 | offset); |
441 | if (offset >= geo->blksize) | |
4a8af273 | 442 | continue; |
4a8af273 DC |
443 | } |
444 | } | |
2f4369a8 | 445 | |
4a8af273 | 446 | /* |
2f4369a8 | 447 | * We have a pointer to an entry. Is it a live one? |
4a8af273 | 448 | */ |
2f4369a8 CH |
449 | dup = bp->b_addr + offset; |
450 | ||
4a8af273 DC |
451 | /* |
452 | * No, it's unused, skip over it. | |
453 | */ | |
454 | if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) { | |
455 | length = be16_to_cpu(dup->length); | |
2f4369a8 | 456 | offset += length; |
4a8af273 DC |
457 | curoff += length; |
458 | continue; | |
459 | } | |
460 | ||
2f4369a8 | 461 | dep = bp->b_addr + offset; |
fdbb8c5b | 462 | length = xfs_dir2_data_entsize(mp, dep->namelen); |
59b8b465 | 463 | filetype = xfs_dir2_data_get_ftype(mp, dep); |
4a8af273 | 464 | |
25994053 | 465 | ctx->pos = xfs_dir2_byte_to_dataptr(curoff) & 0x7fffffff; |
a71895c5 DW |
466 | if (XFS_IS_CORRUPT(dp->i_mount, |
467 | !xfs_dir2_namecheck(dep->name, | |
468 | dep->namelen))) { | |
04df34ac DW |
469 | error = -EFSCORRUPTED; |
470 | break; | |
471 | } | |
4a8af273 | 472 | if (!dir_emit(ctx, (char *)dep->name, dep->namelen, |
0cb97766 | 473 | be64_to_cpu(dep->inumber), |
53f82db0 | 474 | xfs_dir3_get_dtype(dp->i_mount, filetype))) |
4a8af273 DC |
475 | break; |
476 | ||
477 | /* | |
478 | * Advance to next entry in the block. | |
479 | */ | |
2f4369a8 | 480 | offset += length; |
4a8af273 DC |
481 | curoff += length; |
482 | /* bufsize may have just been a guess; don't go negative */ | |
483 | bufsize = bufsize > length ? bufsize - length : 0; | |
484 | } | |
485 | ||
486 | /* | |
487 | * All done. Set output offset value to current offset. | |
488 | */ | |
25994053 | 489 | if (curoff > xfs_dir2_dataptr_to_byte(XFS_DIR2_MAX_DATAPTR)) |
4a8af273 DC |
490 | ctx->pos = XFS_DIR2_MAX_DATAPTR & 0x7fffffff; |
491 | else | |
25994053 | 492 | ctx->pos = xfs_dir2_byte_to_dataptr(curoff) & 0x7fffffff; |
4a8af273 | 493 | if (bp) |
acb9553c | 494 | xfs_trans_brelse(args->trans, bp); |
4a8af273 DC |
495 | return error; |
496 | } | |
497 | ||
498 | /* | |
499 | * Read a directory. | |
acb9553c DW |
500 | * |
501 | * If supplied, the transaction collects locked dir buffers to avoid | |
502 | * nested buffer deadlocks. This function does not dirty the | |
65552b02 | 503 | * transaction. The caller must hold the IOLOCK (shared or exclusive) |
acb9553c | 504 | * before calling this function. |
4a8af273 DC |
505 | */ |
506 | int | |
507 | xfs_readdir( | |
acb9553c | 508 | struct xfs_trans *tp, |
53f82db0 DC |
509 | struct xfs_inode *dp, |
510 | struct dir_context *ctx, | |
511 | size_t bufsize) | |
4a8af273 | 512 | { |
35f46c5f | 513 | struct xfs_da_args args = { NULL }; |
65552b02 | 514 | unsigned int lock_mode; |
c098576f | 515 | bool isblock; |
65552b02 | 516 | int error; |
4a8af273 DC |
517 | |
518 | trace_xfs_readdir(dp); | |
519 | ||
75c8c50f | 520 | if (xfs_is_shutdown(dp->i_mount)) |
2451337d | 521 | return -EIO; |
4a8af273 | 522 | |
c19b3b05 | 523 | ASSERT(S_ISDIR(VFS_I(dp)->i_mode)); |
65552b02 | 524 | ASSERT(xfs_isilocked(dp, XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)); |
ff6d6af2 | 525 | XFS_STATS_INC(dp->i_mount, xs_dir_getdents); |
4a8af273 | 526 | |
53f82db0 DC |
527 | args.dp = dp; |
528 | args.geo = dp->i_mount->m_dir_geo; | |
acb9553c | 529 | args.trans = tp; |
53f82db0 | 530 | |
f7e67b20 | 531 | if (dp->i_df.if_format == XFS_DINODE_FMT_LOCAL) |
65552b02 | 532 | return xfs_dir2_sf_getdents(&args, ctx); |
40194ecc | 533 | |
65552b02 DW |
534 | lock_mode = xfs_ilock_data_map_shared(dp); |
535 | error = xfs_dir2_isblock(&args, &isblock); | |
536 | if (error) | |
537 | goto out_unlock; | |
538 | ||
539 | if (isblock) { | |
540 | error = xfs_dir2_block_getdents(&args, ctx, &lock_mode); | |
541 | goto out_unlock; | |
542 | } | |
543 | ||
544 | error = xfs_dir2_leaf_getdents(&args, ctx, bufsize, &lock_mode); | |
545 | ||
546 | out_unlock: | |
547 | if (lock_mode) | |
548 | xfs_iunlock(dp, lock_mode); | |
549 | return error; | |
4a8af273 | 550 | } |