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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 DC |
34 | { |
35 | if (!xfs_sb_version_hasftype(&mp->m_sb)) | |
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 DC |
59 | |
60 | ASSERT(dp->i_df.if_flags & XFS_IFINLINE); | |
4a8af273 DC |
61 | ASSERT(dp->i_df.if_bytes == dp->i_d.di_size); |
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 | /* | |
73 | * Precalculate offsets for . and .. as we will always need them. | |
74 | * | |
75 | * XXX(hch): the second argument is sometimes 0 and sometimes | |
7dda6e86 | 76 | * geo->datablk |
4a8af273 | 77 | */ |
7dda6e86 | 78 | dot_offset = xfs_dir2_db_off_to_dataptr(geo, geo->datablk, |
1c9a5b2e | 79 | dp->d_ops->data_dot_offset); |
7dda6e86 | 80 | dotdot_offset = xfs_dir2_db_off_to_dataptr(geo, geo->datablk, |
1c9a5b2e | 81 | dp->d_ops->data_dotdot_offset); |
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 | ||
4740175e DC |
117 | ino = dp->d_ops->sf_get_ino(sfp, sfep); |
118 | filetype = dp->d_ops->sf_get_ftype(sfep); | |
4a8af273 | 119 | ctx->pos = off & 0x7fffffff; |
04df34ac DW |
120 | if (!xfs_dir2_namecheck(sfep->name, sfep->namelen)) { |
121 | XFS_ERROR_REPORT(__func__, XFS_ERRLEVEL_LOW, | |
122 | dp->i_mount); | |
123 | return -EFSCORRUPTED; | |
124 | } | |
0cb97766 | 125 | if (!dir_emit(ctx, (char *)sfep->name, sfep->namelen, ino, |
50f6bb6b | 126 | xfs_dir3_get_dtype(mp, filetype))) |
4a8af273 | 127 | return 0; |
50f6bb6b | 128 | sfep = xfs_dir2_sf_nextentry(mp, sfp, sfep); |
4a8af273 DC |
129 | } |
130 | ||
7dda6e86 | 131 | ctx->pos = xfs_dir2_db_off_to_dataptr(geo, geo->datablk + 1, 0) & |
53f82db0 | 132 | 0x7fffffff; |
4a8af273 DC |
133 | return 0; |
134 | } | |
135 | ||
136 | /* | |
137 | * Readdir for block directories. | |
138 | */ | |
139 | STATIC int | |
140 | xfs_dir2_block_getdents( | |
53f82db0 | 141 | struct xfs_da_args *args, |
4a8af273 DC |
142 | struct dir_context *ctx) |
143 | { | |
53f82db0 | 144 | struct xfs_inode *dp = args->dp; /* incore directory inode */ |
4a8af273 DC |
145 | xfs_dir2_data_hdr_t *hdr; /* block header */ |
146 | struct xfs_buf *bp; /* buffer for block */ | |
4a8af273 DC |
147 | xfs_dir2_data_entry_t *dep; /* block data entry */ |
148 | xfs_dir2_data_unused_t *dup; /* block unused entry */ | |
149 | char *endptr; /* end of the data entries */ | |
150 | int error; /* error return value */ | |
4a8af273 DC |
151 | char *ptr; /* current data entry */ |
152 | int wantoff; /* starting block offset */ | |
153 | xfs_off_t cook; | |
53f82db0 | 154 | struct xfs_da_geometry *geo = args->geo; |
dbad7c99 | 155 | int lock_mode; |
4a8af273 | 156 | |
4a8af273 DC |
157 | /* |
158 | * If the block number in the offset is out of range, we're done. | |
159 | */ | |
7dda6e86 | 160 | if (xfs_dir2_dataptr_to_db(geo, ctx->pos) > geo->datablk) |
4a8af273 DC |
161 | return 0; |
162 | ||
dbad7c99 | 163 | lock_mode = xfs_ilock_data_map_shared(dp); |
acb9553c | 164 | error = xfs_dir3_block_read(args->trans, dp, &bp); |
dbad7c99 | 165 | xfs_iunlock(dp, lock_mode); |
4a8af273 DC |
166 | if (error) |
167 | return error; | |
168 | ||
169 | /* | |
170 | * Extract the byte offset we start at from the seek pointer. | |
171 | * We'll skip entries before this. | |
172 | */ | |
30028030 | 173 | wantoff = xfs_dir2_dataptr_to_off(geo, ctx->pos); |
4a8af273 DC |
174 | hdr = bp->b_addr; |
175 | xfs_dir3_data_check(dp, bp); | |
176 | /* | |
177 | * Set up values for the loop. | |
178 | */ | |
2ca98774 | 179 | ptr = (char *)dp->d_ops->data_entry_p(hdr); |
ce92d29d | 180 | endptr = xfs_dir3_data_endp(geo, hdr); |
4a8af273 DC |
181 | |
182 | /* | |
183 | * Loop over the data portion of the block. | |
184 | * Each object is a real entry (dep) or an unused one (dup). | |
185 | */ | |
186 | while (ptr < endptr) { | |
c8ce540d | 187 | uint8_t filetype; |
0cb97766 | 188 | |
4a8af273 DC |
189 | dup = (xfs_dir2_data_unused_t *)ptr; |
190 | /* | |
191 | * Unused, skip it. | |
192 | */ | |
193 | if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) { | |
194 | ptr += be16_to_cpu(dup->length); | |
195 | continue; | |
196 | } | |
197 | ||
198 | dep = (xfs_dir2_data_entry_t *)ptr; | |
199 | ||
200 | /* | |
201 | * Bump pointer for the next iteration. | |
202 | */ | |
9d23fc85 | 203 | ptr += dp->d_ops->data_entsize(dep->namelen); |
4a8af273 DC |
204 | /* |
205 | * The entry is before the desired starting point, skip it. | |
206 | */ | |
207 | if ((char *)dep - (char *)hdr < wantoff) | |
208 | continue; | |
209 | ||
7dda6e86 | 210 | cook = xfs_dir2_db_off_to_dataptr(geo, geo->datablk, |
4a8af273 DC |
211 | (char *)dep - (char *)hdr); |
212 | ||
213 | ctx->pos = cook & 0x7fffffff; | |
9d23fc85 | 214 | filetype = dp->d_ops->data_get_ftype(dep); |
4a8af273 DC |
215 | /* |
216 | * If it didn't fit, set the final offset to here & return. | |
217 | */ | |
04df34ac DW |
218 | if (!xfs_dir2_namecheck(dep->name, dep->namelen)) { |
219 | XFS_ERROR_REPORT(__func__, XFS_ERRLEVEL_LOW, | |
220 | dp->i_mount); | |
221 | error = -EFSCORRUPTED; | |
222 | goto out_rele; | |
223 | } | |
4a8af273 | 224 | if (!dir_emit(ctx, (char *)dep->name, dep->namelen, |
0cb97766 | 225 | be64_to_cpu(dep->inumber), |
04df34ac DW |
226 | xfs_dir3_get_dtype(dp->i_mount, filetype))) |
227 | goto out_rele; | |
4a8af273 DC |
228 | } |
229 | ||
230 | /* | |
231 | * Reached the end of the block. | |
232 | * Set the offset to a non-existent block 1 and return. | |
233 | */ | |
7dda6e86 | 234 | ctx->pos = xfs_dir2_db_off_to_dataptr(geo, geo->datablk + 1, 0) & |
53f82db0 | 235 | 0x7fffffff; |
04df34ac | 236 | out_rele: |
acb9553c | 237 | xfs_trans_brelse(args->trans, bp); |
04df34ac | 238 | return error; |
4a8af273 DC |
239 | } |
240 | ||
d205a7d0 DW |
241 | /* |
242 | * Read a directory block and initiate readahead for blocks beyond that. | |
243 | * We maintain a sliding readahead window of the remaining space in the | |
244 | * buffer rounded up to the nearest block. | |
245 | */ | |
4a8af273 DC |
246 | STATIC int |
247 | xfs_dir2_leaf_readbuf( | |
53f82db0 | 248 | struct xfs_da_args *args, |
4a8af273 | 249 | size_t bufsize, |
d205a7d0 DW |
250 | xfs_dir2_off_t *cur_off, |
251 | xfs_dablk_t *ra_blk, | |
252 | struct xfs_buf **bpp) | |
4a8af273 | 253 | { |
53f82db0 | 254 | struct xfs_inode *dp = args->dp; |
9f541801 | 255 | struct xfs_buf *bp = NULL; |
d205a7d0 DW |
256 | struct xfs_da_geometry *geo = args->geo; |
257 | struct xfs_ifork *ifp = XFS_IFORK_PTR(dp, XFS_DATA_FORK); | |
258 | struct xfs_bmbt_irec map; | |
4a8af273 | 259 | struct blk_plug plug; |
d205a7d0 DW |
260 | xfs_dir2_off_t new_off; |
261 | xfs_dablk_t next_ra; | |
262 | xfs_dablk_t map_off; | |
263 | xfs_dablk_t last_da; | |
b2b1712a | 264 | struct xfs_iext_cursor icur; |
d205a7d0 | 265 | int ra_want; |
4a8af273 | 266 | int error = 0; |
4a8af273 | 267 | |
d205a7d0 DW |
268 | if (!(ifp->if_flags & XFS_IFEXTENTS)) { |
269 | error = xfs_iread_extents(args->trans, dp, XFS_DATA_FORK); | |
4a8af273 | 270 | if (error) |
d205a7d0 | 271 | goto out; |
4a8af273 DC |
272 | } |
273 | ||
274 | /* | |
d205a7d0 DW |
275 | * Look for mapped directory blocks at or above the current offset. |
276 | * Truncate down to the nearest directory block to start the scanning | |
277 | * operation. | |
4a8af273 | 278 | */ |
d205a7d0 DW |
279 | last_da = xfs_dir2_byte_to_da(geo, XFS_DIR2_LEAF_OFFSET); |
280 | map_off = xfs_dir2_db_to_da(geo, xfs_dir2_byte_to_db(geo, *cur_off)); | |
b2b1712a | 281 | if (!xfs_iext_lookup_extent(dp, ifp, map_off, &icur, &map)) |
4a8af273 | 282 | goto out; |
d205a7d0 DW |
283 | if (map.br_startoff >= last_da) |
284 | goto out; | |
285 | xfs_trim_extent(&map, map_off, last_da - map_off); | |
4a8af273 | 286 | |
d205a7d0 DW |
287 | /* Read the directory block of that first mapping. */ |
288 | new_off = xfs_dir2_da_to_byte(geo, map.br_startoff); | |
289 | if (new_off > *cur_off) | |
290 | *cur_off = new_off; | |
291 | error = xfs_dir3_data_read(args->trans, dp, map.br_startoff, -1, &bp); | |
4a8af273 | 292 | if (error) |
d205a7d0 | 293 | goto out; |
4a8af273 DC |
294 | |
295 | /* | |
d205a7d0 DW |
296 | * Start readahead for the next bufsize's worth of dir data blocks. |
297 | * We may have already issued readahead for some of that range; | |
298 | * ra_blk tracks the last block we tried to read(ahead). | |
4a8af273 | 299 | */ |
d205a7d0 DW |
300 | ra_want = howmany(bufsize + geo->blksize, (1 << geo->fsblog)); |
301 | if (*ra_blk >= last_da) | |
302 | goto out; | |
303 | else if (*ra_blk == 0) | |
304 | *ra_blk = map.br_startoff; | |
305 | next_ra = map.br_startoff + geo->fsbcount; | |
306 | if (next_ra >= last_da) | |
307 | goto out_no_ra; | |
308 | if (map.br_blockcount < geo->fsbcount && | |
b2b1712a | 309 | !xfs_iext_next_extent(ifp, &icur, &map)) |
d205a7d0 DW |
310 | goto out_no_ra; |
311 | if (map.br_startoff >= last_da) | |
312 | goto out_no_ra; | |
313 | xfs_trim_extent(&map, next_ra, last_da - next_ra); | |
314 | ||
315 | /* Start ra for each dir (not fs) block that has a mapping. */ | |
4a8af273 | 316 | blk_start_plug(&plug); |
d205a7d0 DW |
317 | while (ra_want > 0) { |
318 | next_ra = roundup((xfs_dablk_t)map.br_startoff, geo->fsbcount); | |
319 | while (ra_want > 0 && | |
320 | next_ra < map.br_startoff + map.br_blockcount) { | |
321 | if (next_ra >= last_da) { | |
322 | *ra_blk = last_da; | |
323 | break; | |
324 | } | |
325 | if (next_ra > *ra_blk) { | |
326 | xfs_dir3_data_readahead(dp, next_ra, -2); | |
327 | *ra_blk = next_ra; | |
4a8af273 | 328 | } |
d205a7d0 DW |
329 | ra_want -= geo->fsbcount; |
330 | next_ra += geo->fsbcount; | |
331 | } | |
b2b1712a | 332 | if (!xfs_iext_next_extent(ifp, &icur, &map)) { |
d205a7d0 DW |
333 | *ra_blk = last_da; |
334 | break; | |
4a8af273 DC |
335 | } |
336 | } | |
337 | blk_finish_plug(&plug); | |
338 | ||
339 | out: | |
340 | *bpp = bp; | |
341 | return error; | |
d205a7d0 DW |
342 | out_no_ra: |
343 | *ra_blk = last_da; | |
344 | goto out; | |
4a8af273 DC |
345 | } |
346 | ||
347 | /* | |
348 | * Getdents (readdir) for leaf and node directories. | |
349 | * This reads the data blocks only, so is the same for both forms. | |
350 | */ | |
351 | STATIC int | |
352 | xfs_dir2_leaf_getdents( | |
53f82db0 | 353 | struct xfs_da_args *args, |
4a8af273 DC |
354 | struct dir_context *ctx, |
355 | size_t bufsize) | |
356 | { | |
53f82db0 | 357 | struct xfs_inode *dp = args->dp; |
4a8af273 DC |
358 | struct xfs_buf *bp = NULL; /* data block buffer */ |
359 | xfs_dir2_data_hdr_t *hdr; /* data block header */ | |
360 | xfs_dir2_data_entry_t *dep; /* data entry */ | |
361 | xfs_dir2_data_unused_t *dup; /* unused entry */ | |
4a8af273 | 362 | char *ptr = NULL; /* pointer to current data */ |
53f82db0 | 363 | struct xfs_da_geometry *geo = args->geo; |
d205a7d0 DW |
364 | xfs_dablk_t rablk = 0; /* current readahead block */ |
365 | xfs_dir2_off_t curoff; /* current overall offset */ | |
366 | int length; /* temporary length value */ | |
367 | int byteoff; /* offset in current block */ | |
368 | int lock_mode; | |
369 | int error = 0; /* error return value */ | |
4a8af273 DC |
370 | |
371 | /* | |
372 | * If the offset is at or past the largest allowed value, | |
373 | * give up right away. | |
374 | */ | |
375 | if (ctx->pos >= XFS_DIR2_MAX_DATAPTR) | |
376 | return 0; | |
377 | ||
4a8af273 DC |
378 | /* |
379 | * Inside the loop we keep the main offset value as a byte offset | |
380 | * in the directory file. | |
381 | */ | |
25994053 | 382 | curoff = xfs_dir2_dataptr_to_byte(ctx->pos); |
4a8af273 | 383 | |
4a8af273 DC |
384 | /* |
385 | * Loop over directory entries until we reach the end offset. | |
386 | * Get more blocks and readahead as necessary. | |
387 | */ | |
388 | while (curoff < XFS_DIR2_LEAF_OFFSET) { | |
c8ce540d | 389 | uint8_t filetype; |
0cb97766 | 390 | |
4a8af273 DC |
391 | /* |
392 | * If we have no buffer, or we're off the end of the | |
393 | * current buffer, need to get another one. | |
394 | */ | |
8f66193c | 395 | if (!bp || ptr >= (char *)bp->b_addr + geo->blksize) { |
9f541801 | 396 | if (bp) { |
d205a7d0 | 397 | xfs_trans_brelse(args->trans, bp); |
9f541801 | 398 | bp = NULL; |
9f541801 | 399 | } |
4a8af273 | 400 | |
dbad7c99 | 401 | lock_mode = xfs_ilock_data_map_shared(dp); |
d205a7d0 DW |
402 | error = xfs_dir2_leaf_readbuf(args, bufsize, &curoff, |
403 | &rablk, &bp); | |
dbad7c99 | 404 | xfs_iunlock(dp, lock_mode); |
d205a7d0 | 405 | if (error || !bp) |
4a8af273 DC |
406 | break; |
407 | ||
4a8af273 DC |
408 | hdr = bp->b_addr; |
409 | xfs_dir3_data_check(dp, bp); | |
410 | /* | |
411 | * Find our position in the block. | |
412 | */ | |
2ca98774 | 413 | ptr = (char *)dp->d_ops->data_entry_p(hdr); |
53f82db0 | 414 | byteoff = xfs_dir2_byte_to_off(geo, curoff); |
4a8af273 DC |
415 | /* |
416 | * Skip past the header. | |
417 | */ | |
418 | if (byteoff == 0) | |
1c9a5b2e | 419 | curoff += dp->d_ops->data_entry_offset; |
4a8af273 DC |
420 | /* |
421 | * Skip past entries until we reach our offset. | |
422 | */ | |
423 | else { | |
424 | while ((char *)ptr - (char *)hdr < byteoff) { | |
425 | dup = (xfs_dir2_data_unused_t *)ptr; | |
426 | ||
427 | if (be16_to_cpu(dup->freetag) | |
428 | == XFS_DIR2_DATA_FREE_TAG) { | |
429 | ||
430 | length = be16_to_cpu(dup->length); | |
431 | ptr += length; | |
432 | continue; | |
433 | } | |
434 | dep = (xfs_dir2_data_entry_t *)ptr; | |
435 | length = | |
9d23fc85 | 436 | dp->d_ops->data_entsize(dep->namelen); |
4a8af273 DC |
437 | ptr += length; |
438 | } | |
439 | /* | |
440 | * Now set our real offset. | |
441 | */ | |
442 | curoff = | |
30028030 DC |
443 | xfs_dir2_db_off_to_byte(geo, |
444 | xfs_dir2_byte_to_db(geo, curoff), | |
4a8af273 | 445 | (char *)ptr - (char *)hdr); |
8f66193c | 446 | if (ptr >= (char *)hdr + geo->blksize) { |
4a8af273 DC |
447 | continue; |
448 | } | |
449 | } | |
450 | } | |
451 | /* | |
452 | * We have a pointer to an entry. | |
453 | * Is it a live one? | |
454 | */ | |
455 | dup = (xfs_dir2_data_unused_t *)ptr; | |
456 | /* | |
457 | * No, it's unused, skip over it. | |
458 | */ | |
459 | if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) { | |
460 | length = be16_to_cpu(dup->length); | |
461 | ptr += length; | |
462 | curoff += length; | |
463 | continue; | |
464 | } | |
465 | ||
466 | dep = (xfs_dir2_data_entry_t *)ptr; | |
9d23fc85 DC |
467 | length = dp->d_ops->data_entsize(dep->namelen); |
468 | filetype = dp->d_ops->data_get_ftype(dep); | |
4a8af273 | 469 | |
25994053 | 470 | ctx->pos = xfs_dir2_byte_to_dataptr(curoff) & 0x7fffffff; |
04df34ac DW |
471 | if (!xfs_dir2_namecheck(dep->name, dep->namelen)) { |
472 | XFS_ERROR_REPORT(__func__, XFS_ERRLEVEL_LOW, | |
473 | dp->i_mount); | |
474 | error = -EFSCORRUPTED; | |
475 | break; | |
476 | } | |
4a8af273 | 477 | if (!dir_emit(ctx, (char *)dep->name, dep->namelen, |
0cb97766 | 478 | be64_to_cpu(dep->inumber), |
53f82db0 | 479 | xfs_dir3_get_dtype(dp->i_mount, filetype))) |
4a8af273 DC |
480 | break; |
481 | ||
482 | /* | |
483 | * Advance to next entry in the block. | |
484 | */ | |
485 | ptr += length; | |
486 | curoff += length; | |
487 | /* bufsize may have just been a guess; don't go negative */ | |
488 | bufsize = bufsize > length ? bufsize - length : 0; | |
489 | } | |
490 | ||
491 | /* | |
492 | * All done. Set output offset value to current offset. | |
493 | */ | |
25994053 | 494 | if (curoff > xfs_dir2_dataptr_to_byte(XFS_DIR2_MAX_DATAPTR)) |
4a8af273 DC |
495 | ctx->pos = XFS_DIR2_MAX_DATAPTR & 0x7fffffff; |
496 | else | |
25994053 | 497 | ctx->pos = xfs_dir2_byte_to_dataptr(curoff) & 0x7fffffff; |
4a8af273 | 498 | if (bp) |
acb9553c | 499 | xfs_trans_brelse(args->trans, bp); |
4a8af273 DC |
500 | return error; |
501 | } | |
502 | ||
503 | /* | |
504 | * Read a directory. | |
acb9553c DW |
505 | * |
506 | * If supplied, the transaction collects locked dir buffers to avoid | |
507 | * nested buffer deadlocks. This function does not dirty the | |
508 | * transaction. The caller should ensure that the inode is locked | |
509 | * before calling this function. | |
4a8af273 DC |
510 | */ |
511 | int | |
512 | xfs_readdir( | |
acb9553c | 513 | struct xfs_trans *tp, |
53f82db0 DC |
514 | struct xfs_inode *dp, |
515 | struct dir_context *ctx, | |
516 | size_t bufsize) | |
4a8af273 | 517 | { |
35f46c5f | 518 | struct xfs_da_args args = { NULL }; |
53f82db0 DC |
519 | int rval; |
520 | int v; | |
4a8af273 DC |
521 | |
522 | trace_xfs_readdir(dp); | |
523 | ||
524 | if (XFS_FORCED_SHUTDOWN(dp->i_mount)) | |
2451337d | 525 | return -EIO; |
4a8af273 | 526 | |
c19b3b05 | 527 | ASSERT(S_ISDIR(VFS_I(dp)->i_mode)); |
ff6d6af2 | 528 | XFS_STATS_INC(dp->i_mount, xs_dir_getdents); |
4a8af273 | 529 | |
53f82db0 DC |
530 | args.dp = dp; |
531 | args.geo = dp->i_mount->m_dir_geo; | |
acb9553c | 532 | args.trans = tp; |
53f82db0 | 533 | |
4a8af273 | 534 | if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) |
53f82db0 DC |
535 | rval = xfs_dir2_sf_getdents(&args, ctx); |
536 | else if ((rval = xfs_dir2_isblock(&args, &v))) | |
4a8af273 DC |
537 | ; |
538 | else if (v) | |
53f82db0 | 539 | rval = xfs_dir2_block_getdents(&args, ctx); |
4a8af273 | 540 | else |
53f82db0 | 541 | rval = xfs_dir2_leaf_getdents(&args, ctx, bufsize); |
40194ecc | 542 | |
4a8af273 DC |
543 | return rval; |
544 | } |