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4a8af273 DC |
1 | /* |
2 | * Copyright (c) 2000-2005 Silicon Graphics, Inc. | |
3 | * Copyright (c) 2013 Red Hat, Inc. | |
4 | * All Rights Reserved. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it would be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write the Free Software Foundation, | |
17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
18 | */ | |
19 | #include "xfs.h" | |
20 | #include "xfs_fs.h" | |
a4fbe6ab | 21 | #include "xfs_format.h" |
239880ef DC |
22 | #include "xfs_log_format.h" |
23 | #include "xfs_trans_resv.h" | |
4a8af273 | 24 | #include "xfs_bit.h" |
4a8af273 | 25 | #include "xfs_mount.h" |
57062787 | 26 | #include "xfs_da_format.h" |
4a8af273 | 27 | #include "xfs_da_btree.h" |
4a8af273 | 28 | #include "xfs_inode.h" |
2b9ab5ab | 29 | #include "xfs_dir2.h" |
4a8af273 DC |
30 | #include "xfs_dir2_priv.h" |
31 | #include "xfs_error.h" | |
32 | #include "xfs_trace.h" | |
33 | #include "xfs_bmap.h" | |
239880ef | 34 | #include "xfs_trans.h" |
4a8af273 | 35 | |
0cb97766 DC |
36 | /* |
37 | * Directory file type support functions | |
38 | */ | |
39 | static unsigned char xfs_dir3_filetype_table[] = { | |
40 | DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, | |
41 | DT_FIFO, DT_SOCK, DT_LNK, DT_WHT, | |
42 | }; | |
43 | ||
a5c46e5e | 44 | unsigned char |
0cb97766 DC |
45 | xfs_dir3_get_dtype( |
46 | struct xfs_mount *mp, | |
c8ce540d | 47 | uint8_t filetype) |
0cb97766 DC |
48 | { |
49 | if (!xfs_sb_version_hasftype(&mp->m_sb)) | |
50 | return DT_UNKNOWN; | |
51 | ||
52 | if (filetype >= XFS_DIR3_FT_MAX) | |
53 | return DT_UNKNOWN; | |
54 | ||
55 | return xfs_dir3_filetype_table[filetype]; | |
56 | } | |
0cb97766 | 57 | |
4a8af273 DC |
58 | STATIC int |
59 | xfs_dir2_sf_getdents( | |
53f82db0 | 60 | struct xfs_da_args *args, |
4a8af273 DC |
61 | struct dir_context *ctx) |
62 | { | |
63 | int i; /* shortform entry number */ | |
53f82db0 | 64 | struct xfs_inode *dp = args->dp; /* incore directory inode */ |
4a8af273 DC |
65 | xfs_dir2_dataptr_t off; /* current entry's offset */ |
66 | xfs_dir2_sf_entry_t *sfep; /* shortform directory entry */ | |
67 | xfs_dir2_sf_hdr_t *sfp; /* shortform structure */ | |
68 | xfs_dir2_dataptr_t dot_offset; | |
69 | xfs_dir2_dataptr_t dotdot_offset; | |
70 | xfs_ino_t ino; | |
53f82db0 | 71 | struct xfs_da_geometry *geo = args->geo; |
4a8af273 DC |
72 | |
73 | ASSERT(dp->i_df.if_flags & XFS_IFINLINE); | |
4a8af273 DC |
74 | ASSERT(dp->i_df.if_bytes == dp->i_d.di_size); |
75 | ASSERT(dp->i_df.if_u1.if_data != NULL); | |
76 | ||
77 | sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data; | |
78 | ||
4a8af273 DC |
79 | /* |
80 | * If the block number in the offset is out of range, we're done. | |
81 | */ | |
7dda6e86 | 82 | if (xfs_dir2_dataptr_to_db(geo, ctx->pos) > geo->datablk) |
4a8af273 DC |
83 | return 0; |
84 | ||
85 | /* | |
86 | * Precalculate offsets for . and .. as we will always need them. | |
87 | * | |
88 | * XXX(hch): the second argument is sometimes 0 and sometimes | |
7dda6e86 | 89 | * geo->datablk |
4a8af273 | 90 | */ |
7dda6e86 | 91 | dot_offset = xfs_dir2_db_off_to_dataptr(geo, geo->datablk, |
1c9a5b2e | 92 | dp->d_ops->data_dot_offset); |
7dda6e86 | 93 | dotdot_offset = xfs_dir2_db_off_to_dataptr(geo, geo->datablk, |
1c9a5b2e | 94 | dp->d_ops->data_dotdot_offset); |
4a8af273 DC |
95 | |
96 | /* | |
97 | * Put . entry unless we're starting past it. | |
98 | */ | |
99 | if (ctx->pos <= dot_offset) { | |
100 | ctx->pos = dot_offset & 0x7fffffff; | |
101 | if (!dir_emit(ctx, ".", 1, dp->i_ino, DT_DIR)) | |
102 | return 0; | |
103 | } | |
104 | ||
105 | /* | |
106 | * Put .. entry unless we're starting past it. | |
107 | */ | |
108 | if (ctx->pos <= dotdot_offset) { | |
4740175e | 109 | ino = dp->d_ops->sf_get_parent_ino(sfp); |
4a8af273 DC |
110 | ctx->pos = dotdot_offset & 0x7fffffff; |
111 | if (!dir_emit(ctx, "..", 2, ino, DT_DIR)) | |
112 | return 0; | |
113 | } | |
114 | ||
115 | /* | |
116 | * Loop while there are more entries and put'ing works. | |
117 | */ | |
118 | sfep = xfs_dir2_sf_firstentry(sfp); | |
119 | for (i = 0; i < sfp->count; i++) { | |
c8ce540d | 120 | uint8_t filetype; |
0cb97766 | 121 | |
7dda6e86 | 122 | off = xfs_dir2_db_off_to_dataptr(geo, geo->datablk, |
4a8af273 DC |
123 | xfs_dir2_sf_get_offset(sfep)); |
124 | ||
125 | if (ctx->pos > off) { | |
32c5483a | 126 | sfep = dp->d_ops->sf_nextentry(sfp, sfep); |
4a8af273 DC |
127 | continue; |
128 | } | |
129 | ||
4740175e DC |
130 | ino = dp->d_ops->sf_get_ino(sfp, sfep); |
131 | filetype = dp->d_ops->sf_get_ftype(sfep); | |
4a8af273 | 132 | ctx->pos = off & 0x7fffffff; |
0cb97766 | 133 | if (!dir_emit(ctx, (char *)sfep->name, sfep->namelen, ino, |
53f82db0 | 134 | xfs_dir3_get_dtype(dp->i_mount, filetype))) |
4a8af273 | 135 | return 0; |
32c5483a | 136 | sfep = dp->d_ops->sf_nextentry(sfp, sfep); |
4a8af273 DC |
137 | } |
138 | ||
7dda6e86 | 139 | ctx->pos = xfs_dir2_db_off_to_dataptr(geo, geo->datablk + 1, 0) & |
53f82db0 | 140 | 0x7fffffff; |
4a8af273 DC |
141 | return 0; |
142 | } | |
143 | ||
144 | /* | |
145 | * Readdir for block directories. | |
146 | */ | |
147 | STATIC int | |
148 | xfs_dir2_block_getdents( | |
53f82db0 | 149 | struct xfs_da_args *args, |
4a8af273 DC |
150 | struct dir_context *ctx) |
151 | { | |
53f82db0 | 152 | struct xfs_inode *dp = args->dp; /* incore directory inode */ |
4a8af273 DC |
153 | xfs_dir2_data_hdr_t *hdr; /* block header */ |
154 | struct xfs_buf *bp; /* buffer for block */ | |
155 | xfs_dir2_block_tail_t *btp; /* block tail */ | |
156 | xfs_dir2_data_entry_t *dep; /* block data entry */ | |
157 | xfs_dir2_data_unused_t *dup; /* block unused entry */ | |
158 | char *endptr; /* end of the data entries */ | |
159 | int error; /* error return value */ | |
4a8af273 DC |
160 | char *ptr; /* current data entry */ |
161 | int wantoff; /* starting block offset */ | |
162 | xfs_off_t cook; | |
53f82db0 | 163 | struct xfs_da_geometry *geo = args->geo; |
dbad7c99 | 164 | int lock_mode; |
4a8af273 | 165 | |
4a8af273 DC |
166 | /* |
167 | * If the block number in the offset is out of range, we're done. | |
168 | */ | |
7dda6e86 | 169 | if (xfs_dir2_dataptr_to_db(geo, ctx->pos) > geo->datablk) |
4a8af273 DC |
170 | return 0; |
171 | ||
dbad7c99 | 172 | lock_mode = xfs_ilock_data_map_shared(dp); |
acb9553c | 173 | error = xfs_dir3_block_read(args->trans, dp, &bp); |
dbad7c99 | 174 | xfs_iunlock(dp, lock_mode); |
4a8af273 DC |
175 | if (error) |
176 | return error; | |
177 | ||
178 | /* | |
179 | * Extract the byte offset we start at from the seek pointer. | |
180 | * We'll skip entries before this. | |
181 | */ | |
30028030 | 182 | wantoff = xfs_dir2_dataptr_to_off(geo, ctx->pos); |
4a8af273 DC |
183 | hdr = bp->b_addr; |
184 | xfs_dir3_data_check(dp, bp); | |
185 | /* | |
186 | * Set up values for the loop. | |
187 | */ | |
8f66193c | 188 | btp = xfs_dir2_block_tail_p(geo, hdr); |
2ca98774 | 189 | ptr = (char *)dp->d_ops->data_entry_p(hdr); |
4a8af273 DC |
190 | endptr = (char *)xfs_dir2_block_leaf_p(btp); |
191 | ||
192 | /* | |
193 | * Loop over the data portion of the block. | |
194 | * Each object is a real entry (dep) or an unused one (dup). | |
195 | */ | |
196 | while (ptr < endptr) { | |
c8ce540d | 197 | uint8_t filetype; |
0cb97766 | 198 | |
4a8af273 DC |
199 | dup = (xfs_dir2_data_unused_t *)ptr; |
200 | /* | |
201 | * Unused, skip it. | |
202 | */ | |
203 | if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) { | |
204 | ptr += be16_to_cpu(dup->length); | |
205 | continue; | |
206 | } | |
207 | ||
208 | dep = (xfs_dir2_data_entry_t *)ptr; | |
209 | ||
210 | /* | |
211 | * Bump pointer for the next iteration. | |
212 | */ | |
9d23fc85 | 213 | ptr += dp->d_ops->data_entsize(dep->namelen); |
4a8af273 DC |
214 | /* |
215 | * The entry is before the desired starting point, skip it. | |
216 | */ | |
217 | if ((char *)dep - (char *)hdr < wantoff) | |
218 | continue; | |
219 | ||
7dda6e86 | 220 | cook = xfs_dir2_db_off_to_dataptr(geo, geo->datablk, |
4a8af273 DC |
221 | (char *)dep - (char *)hdr); |
222 | ||
223 | ctx->pos = cook & 0x7fffffff; | |
9d23fc85 | 224 | filetype = dp->d_ops->data_get_ftype(dep); |
4a8af273 DC |
225 | /* |
226 | * If it didn't fit, set the final offset to here & return. | |
227 | */ | |
228 | if (!dir_emit(ctx, (char *)dep->name, dep->namelen, | |
0cb97766 | 229 | be64_to_cpu(dep->inumber), |
53f82db0 | 230 | xfs_dir3_get_dtype(dp->i_mount, filetype))) { |
acb9553c | 231 | xfs_trans_brelse(args->trans, bp); |
4a8af273 DC |
232 | return 0; |
233 | } | |
234 | } | |
235 | ||
236 | /* | |
237 | * Reached the end of the block. | |
238 | * Set the offset to a non-existent block 1 and return. | |
239 | */ | |
7dda6e86 | 240 | ctx->pos = xfs_dir2_db_off_to_dataptr(geo, geo->datablk + 1, 0) & |
53f82db0 | 241 | 0x7fffffff; |
acb9553c | 242 | xfs_trans_brelse(args->trans, bp); |
4a8af273 DC |
243 | return 0; |
244 | } | |
245 | ||
d205a7d0 DW |
246 | /* |
247 | * Read a directory block and initiate readahead for blocks beyond that. | |
248 | * We maintain a sliding readahead window of the remaining space in the | |
249 | * buffer rounded up to the nearest block. | |
250 | */ | |
4a8af273 DC |
251 | STATIC int |
252 | xfs_dir2_leaf_readbuf( | |
53f82db0 | 253 | struct xfs_da_args *args, |
4a8af273 | 254 | size_t bufsize, |
d205a7d0 DW |
255 | xfs_dir2_off_t *cur_off, |
256 | xfs_dablk_t *ra_blk, | |
257 | struct xfs_buf **bpp) | |
4a8af273 | 258 | { |
53f82db0 | 259 | struct xfs_inode *dp = args->dp; |
9f541801 | 260 | struct xfs_buf *bp = NULL; |
d205a7d0 DW |
261 | struct xfs_da_geometry *geo = args->geo; |
262 | struct xfs_ifork *ifp = XFS_IFORK_PTR(dp, XFS_DATA_FORK); | |
263 | struct xfs_bmbt_irec map; | |
4a8af273 | 264 | struct blk_plug plug; |
d205a7d0 DW |
265 | xfs_dir2_off_t new_off; |
266 | xfs_dablk_t next_ra; | |
267 | xfs_dablk_t map_off; | |
268 | xfs_dablk_t last_da; | |
b2b1712a | 269 | struct xfs_iext_cursor icur; |
d205a7d0 | 270 | int ra_want; |
4a8af273 | 271 | int error = 0; |
4a8af273 | 272 | |
d205a7d0 DW |
273 | if (!(ifp->if_flags & XFS_IFEXTENTS)) { |
274 | error = xfs_iread_extents(args->trans, dp, XFS_DATA_FORK); | |
4a8af273 | 275 | if (error) |
d205a7d0 | 276 | goto out; |
4a8af273 DC |
277 | } |
278 | ||
279 | /* | |
d205a7d0 DW |
280 | * Look for mapped directory blocks at or above the current offset. |
281 | * Truncate down to the nearest directory block to start the scanning | |
282 | * operation. | |
4a8af273 | 283 | */ |
d205a7d0 DW |
284 | last_da = xfs_dir2_byte_to_da(geo, XFS_DIR2_LEAF_OFFSET); |
285 | map_off = xfs_dir2_db_to_da(geo, xfs_dir2_byte_to_db(geo, *cur_off)); | |
b2b1712a | 286 | if (!xfs_iext_lookup_extent(dp, ifp, map_off, &icur, &map)) |
4a8af273 | 287 | goto out; |
d205a7d0 DW |
288 | if (map.br_startoff >= last_da) |
289 | goto out; | |
290 | xfs_trim_extent(&map, map_off, last_da - map_off); | |
4a8af273 | 291 | |
d205a7d0 DW |
292 | /* Read the directory block of that first mapping. */ |
293 | new_off = xfs_dir2_da_to_byte(geo, map.br_startoff); | |
294 | if (new_off > *cur_off) | |
295 | *cur_off = new_off; | |
296 | error = xfs_dir3_data_read(args->trans, dp, map.br_startoff, -1, &bp); | |
4a8af273 | 297 | if (error) |
d205a7d0 | 298 | goto out; |
4a8af273 DC |
299 | |
300 | /* | |
d205a7d0 DW |
301 | * Start readahead for the next bufsize's worth of dir data blocks. |
302 | * We may have already issued readahead for some of that range; | |
303 | * ra_blk tracks the last block we tried to read(ahead). | |
4a8af273 | 304 | */ |
d205a7d0 DW |
305 | ra_want = howmany(bufsize + geo->blksize, (1 << geo->fsblog)); |
306 | if (*ra_blk >= last_da) | |
307 | goto out; | |
308 | else if (*ra_blk == 0) | |
309 | *ra_blk = map.br_startoff; | |
310 | next_ra = map.br_startoff + geo->fsbcount; | |
311 | if (next_ra >= last_da) | |
312 | goto out_no_ra; | |
313 | if (map.br_blockcount < geo->fsbcount && | |
b2b1712a | 314 | !xfs_iext_next_extent(ifp, &icur, &map)) |
d205a7d0 DW |
315 | goto out_no_ra; |
316 | if (map.br_startoff >= last_da) | |
317 | goto out_no_ra; | |
318 | xfs_trim_extent(&map, next_ra, last_da - next_ra); | |
319 | ||
320 | /* Start ra for each dir (not fs) block that has a mapping. */ | |
4a8af273 | 321 | blk_start_plug(&plug); |
d205a7d0 DW |
322 | while (ra_want > 0) { |
323 | next_ra = roundup((xfs_dablk_t)map.br_startoff, geo->fsbcount); | |
324 | while (ra_want > 0 && | |
325 | next_ra < map.br_startoff + map.br_blockcount) { | |
326 | if (next_ra >= last_da) { | |
327 | *ra_blk = last_da; | |
328 | break; | |
329 | } | |
330 | if (next_ra > *ra_blk) { | |
331 | xfs_dir3_data_readahead(dp, next_ra, -2); | |
332 | *ra_blk = next_ra; | |
4a8af273 | 333 | } |
d205a7d0 DW |
334 | ra_want -= geo->fsbcount; |
335 | next_ra += geo->fsbcount; | |
336 | } | |
b2b1712a | 337 | if (!xfs_iext_next_extent(ifp, &icur, &map)) { |
d205a7d0 DW |
338 | *ra_blk = last_da; |
339 | break; | |
4a8af273 DC |
340 | } |
341 | } | |
342 | blk_finish_plug(&plug); | |
343 | ||
344 | out: | |
345 | *bpp = bp; | |
346 | return error; | |
d205a7d0 DW |
347 | out_no_ra: |
348 | *ra_blk = last_da; | |
349 | goto out; | |
4a8af273 DC |
350 | } |
351 | ||
352 | /* | |
353 | * Getdents (readdir) for leaf and node directories. | |
354 | * This reads the data blocks only, so is the same for both forms. | |
355 | */ | |
356 | STATIC int | |
357 | xfs_dir2_leaf_getdents( | |
53f82db0 | 358 | struct xfs_da_args *args, |
4a8af273 DC |
359 | struct dir_context *ctx, |
360 | size_t bufsize) | |
361 | { | |
53f82db0 | 362 | struct xfs_inode *dp = args->dp; |
4a8af273 DC |
363 | struct xfs_buf *bp = NULL; /* data block buffer */ |
364 | xfs_dir2_data_hdr_t *hdr; /* data block header */ | |
365 | xfs_dir2_data_entry_t *dep; /* data entry */ | |
366 | xfs_dir2_data_unused_t *dup; /* unused entry */ | |
4a8af273 | 367 | char *ptr = NULL; /* pointer to current data */ |
53f82db0 | 368 | struct xfs_da_geometry *geo = args->geo; |
d205a7d0 DW |
369 | xfs_dablk_t rablk = 0; /* current readahead block */ |
370 | xfs_dir2_off_t curoff; /* current overall offset */ | |
371 | int length; /* temporary length value */ | |
372 | int byteoff; /* offset in current block */ | |
373 | int lock_mode; | |
374 | int error = 0; /* error return value */ | |
4a8af273 DC |
375 | |
376 | /* | |
377 | * If the offset is at or past the largest allowed value, | |
378 | * give up right away. | |
379 | */ | |
380 | if (ctx->pos >= XFS_DIR2_MAX_DATAPTR) | |
381 | return 0; | |
382 | ||
4a8af273 DC |
383 | /* |
384 | * Inside the loop we keep the main offset value as a byte offset | |
385 | * in the directory file. | |
386 | */ | |
25994053 | 387 | curoff = xfs_dir2_dataptr_to_byte(ctx->pos); |
4a8af273 | 388 | |
4a8af273 DC |
389 | /* |
390 | * Loop over directory entries until we reach the end offset. | |
391 | * Get more blocks and readahead as necessary. | |
392 | */ | |
393 | while (curoff < XFS_DIR2_LEAF_OFFSET) { | |
c8ce540d | 394 | uint8_t filetype; |
0cb97766 | 395 | |
4a8af273 DC |
396 | /* |
397 | * If we have no buffer, or we're off the end of the | |
398 | * current buffer, need to get another one. | |
399 | */ | |
8f66193c | 400 | if (!bp || ptr >= (char *)bp->b_addr + geo->blksize) { |
9f541801 | 401 | if (bp) { |
d205a7d0 | 402 | xfs_trans_brelse(args->trans, bp); |
9f541801 | 403 | bp = NULL; |
9f541801 | 404 | } |
4a8af273 | 405 | |
dbad7c99 | 406 | lock_mode = xfs_ilock_data_map_shared(dp); |
d205a7d0 DW |
407 | error = xfs_dir2_leaf_readbuf(args, bufsize, &curoff, |
408 | &rablk, &bp); | |
dbad7c99 | 409 | xfs_iunlock(dp, lock_mode); |
d205a7d0 | 410 | if (error || !bp) |
4a8af273 DC |
411 | break; |
412 | ||
4a8af273 DC |
413 | hdr = bp->b_addr; |
414 | xfs_dir3_data_check(dp, bp); | |
415 | /* | |
416 | * Find our position in the block. | |
417 | */ | |
2ca98774 | 418 | ptr = (char *)dp->d_ops->data_entry_p(hdr); |
53f82db0 | 419 | byteoff = xfs_dir2_byte_to_off(geo, curoff); |
4a8af273 DC |
420 | /* |
421 | * Skip past the header. | |
422 | */ | |
423 | if (byteoff == 0) | |
1c9a5b2e | 424 | curoff += dp->d_ops->data_entry_offset; |
4a8af273 DC |
425 | /* |
426 | * Skip past entries until we reach our offset. | |
427 | */ | |
428 | else { | |
429 | while ((char *)ptr - (char *)hdr < byteoff) { | |
430 | dup = (xfs_dir2_data_unused_t *)ptr; | |
431 | ||
432 | if (be16_to_cpu(dup->freetag) | |
433 | == XFS_DIR2_DATA_FREE_TAG) { | |
434 | ||
435 | length = be16_to_cpu(dup->length); | |
436 | ptr += length; | |
437 | continue; | |
438 | } | |
439 | dep = (xfs_dir2_data_entry_t *)ptr; | |
440 | length = | |
9d23fc85 | 441 | dp->d_ops->data_entsize(dep->namelen); |
4a8af273 DC |
442 | ptr += length; |
443 | } | |
444 | /* | |
445 | * Now set our real offset. | |
446 | */ | |
447 | curoff = | |
30028030 DC |
448 | xfs_dir2_db_off_to_byte(geo, |
449 | xfs_dir2_byte_to_db(geo, curoff), | |
4a8af273 | 450 | (char *)ptr - (char *)hdr); |
8f66193c | 451 | if (ptr >= (char *)hdr + geo->blksize) { |
4a8af273 DC |
452 | continue; |
453 | } | |
454 | } | |
455 | } | |
456 | /* | |
457 | * We have a pointer to an entry. | |
458 | * Is it a live one? | |
459 | */ | |
460 | dup = (xfs_dir2_data_unused_t *)ptr; | |
461 | /* | |
462 | * No, it's unused, skip over it. | |
463 | */ | |
464 | if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) { | |
465 | length = be16_to_cpu(dup->length); | |
466 | ptr += length; | |
467 | curoff += length; | |
468 | continue; | |
469 | } | |
470 | ||
471 | dep = (xfs_dir2_data_entry_t *)ptr; | |
9d23fc85 DC |
472 | length = dp->d_ops->data_entsize(dep->namelen); |
473 | filetype = dp->d_ops->data_get_ftype(dep); | |
4a8af273 | 474 | |
25994053 | 475 | ctx->pos = xfs_dir2_byte_to_dataptr(curoff) & 0x7fffffff; |
4a8af273 | 476 | if (!dir_emit(ctx, (char *)dep->name, dep->namelen, |
0cb97766 | 477 | be64_to_cpu(dep->inumber), |
53f82db0 | 478 | xfs_dir3_get_dtype(dp->i_mount, filetype))) |
4a8af273 DC |
479 | break; |
480 | ||
481 | /* | |
482 | * Advance to next entry in the block. | |
483 | */ | |
484 | ptr += length; | |
485 | curoff += length; | |
486 | /* bufsize may have just been a guess; don't go negative */ | |
487 | bufsize = bufsize > length ? bufsize - length : 0; | |
488 | } | |
489 | ||
490 | /* | |
491 | * All done. Set output offset value to current offset. | |
492 | */ | |
25994053 | 493 | if (curoff > xfs_dir2_dataptr_to_byte(XFS_DIR2_MAX_DATAPTR)) |
4a8af273 DC |
494 | ctx->pos = XFS_DIR2_MAX_DATAPTR & 0x7fffffff; |
495 | else | |
25994053 | 496 | ctx->pos = xfs_dir2_byte_to_dataptr(curoff) & 0x7fffffff; |
4a8af273 | 497 | if (bp) |
acb9553c | 498 | xfs_trans_brelse(args->trans, bp); |
4a8af273 DC |
499 | return error; |
500 | } | |
501 | ||
502 | /* | |
503 | * Read a directory. | |
acb9553c DW |
504 | * |
505 | * If supplied, the transaction collects locked dir buffers to avoid | |
506 | * nested buffer deadlocks. This function does not dirty the | |
507 | * transaction. The caller should ensure that the inode is locked | |
508 | * before calling this function. | |
4a8af273 DC |
509 | */ |
510 | int | |
511 | xfs_readdir( | |
acb9553c | 512 | struct xfs_trans *tp, |
53f82db0 DC |
513 | struct xfs_inode *dp, |
514 | struct dir_context *ctx, | |
515 | size_t bufsize) | |
4a8af273 | 516 | { |
35f46c5f | 517 | struct xfs_da_args args = { NULL }; |
53f82db0 DC |
518 | int rval; |
519 | int v; | |
4a8af273 DC |
520 | |
521 | trace_xfs_readdir(dp); | |
522 | ||
523 | if (XFS_FORCED_SHUTDOWN(dp->i_mount)) | |
2451337d | 524 | return -EIO; |
4a8af273 | 525 | |
c19b3b05 | 526 | ASSERT(S_ISDIR(VFS_I(dp)->i_mode)); |
ff6d6af2 | 527 | XFS_STATS_INC(dp->i_mount, xs_dir_getdents); |
4a8af273 | 528 | |
53f82db0 DC |
529 | args.dp = dp; |
530 | args.geo = dp->i_mount->m_dir_geo; | |
acb9553c | 531 | args.trans = tp; |
53f82db0 | 532 | |
4a8af273 | 533 | if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) |
53f82db0 DC |
534 | rval = xfs_dir2_sf_getdents(&args, ctx); |
535 | else if ((rval = xfs_dir2_isblock(&args, &v))) | |
4a8af273 DC |
536 | ; |
537 | else if (v) | |
53f82db0 | 538 | rval = xfs_dir2_block_getdents(&args, ctx); |
4a8af273 | 539 | else |
53f82db0 | 540 | rval = xfs_dir2_leaf_getdents(&args, ctx, bufsize); |
40194ecc | 541 | |
4a8af273 DC |
542 | return rval; |
543 | } |