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" |
4a8af273 | 20 | |
0cb97766 DC |
21 | /* |
22 | * Directory file type support functions | |
23 | */ | |
24 | static unsigned char xfs_dir3_filetype_table[] = { | |
25 | DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, | |
26 | DT_FIFO, DT_SOCK, DT_LNK, DT_WHT, | |
27 | }; | |
28 | ||
a5c46e5e | 29 | unsigned char |
0cb97766 DC |
30 | xfs_dir3_get_dtype( |
31 | struct xfs_mount *mp, | |
c8ce540d | 32 | uint8_t filetype) |
0cb97766 DC |
33 | { |
34 | if (!xfs_sb_version_hasftype(&mp->m_sb)) | |
35 | return DT_UNKNOWN; | |
36 | ||
37 | if (filetype >= XFS_DIR3_FT_MAX) | |
38 | return DT_UNKNOWN; | |
39 | ||
40 | return xfs_dir3_filetype_table[filetype]; | |
41 | } | |
0cb97766 | 42 | |
4a8af273 DC |
43 | STATIC int |
44 | xfs_dir2_sf_getdents( | |
53f82db0 | 45 | struct xfs_da_args *args, |
4a8af273 DC |
46 | struct dir_context *ctx) |
47 | { | |
48 | int i; /* shortform entry number */ | |
53f82db0 | 49 | struct xfs_inode *dp = args->dp; /* incore directory inode */ |
4a8af273 DC |
50 | xfs_dir2_dataptr_t off; /* current entry's offset */ |
51 | xfs_dir2_sf_entry_t *sfep; /* shortform directory entry */ | |
52 | xfs_dir2_sf_hdr_t *sfp; /* shortform structure */ | |
53 | xfs_dir2_dataptr_t dot_offset; | |
54 | xfs_dir2_dataptr_t dotdot_offset; | |
55 | xfs_ino_t ino; | |
53f82db0 | 56 | struct xfs_da_geometry *geo = args->geo; |
4a8af273 DC |
57 | |
58 | ASSERT(dp->i_df.if_flags & XFS_IFINLINE); | |
4a8af273 DC |
59 | ASSERT(dp->i_df.if_bytes == dp->i_d.di_size); |
60 | ASSERT(dp->i_df.if_u1.if_data != NULL); | |
61 | ||
62 | sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data; | |
63 | ||
4a8af273 DC |
64 | /* |
65 | * If the block number in the offset is out of range, we're done. | |
66 | */ | |
7dda6e86 | 67 | if (xfs_dir2_dataptr_to_db(geo, ctx->pos) > geo->datablk) |
4a8af273 DC |
68 | return 0; |
69 | ||
70 | /* | |
71 | * Precalculate offsets for . and .. as we will always need them. | |
72 | * | |
73 | * XXX(hch): the second argument is sometimes 0 and sometimes | |
7dda6e86 | 74 | * geo->datablk |
4a8af273 | 75 | */ |
7dda6e86 | 76 | dot_offset = xfs_dir2_db_off_to_dataptr(geo, geo->datablk, |
1c9a5b2e | 77 | dp->d_ops->data_dot_offset); |
7dda6e86 | 78 | dotdot_offset = xfs_dir2_db_off_to_dataptr(geo, geo->datablk, |
1c9a5b2e | 79 | dp->d_ops->data_dotdot_offset); |
4a8af273 DC |
80 | |
81 | /* | |
82 | * Put . entry unless we're starting past it. | |
83 | */ | |
84 | if (ctx->pos <= dot_offset) { | |
85 | ctx->pos = dot_offset & 0x7fffffff; | |
86 | if (!dir_emit(ctx, ".", 1, dp->i_ino, DT_DIR)) | |
87 | return 0; | |
88 | } | |
89 | ||
90 | /* | |
91 | * Put .. entry unless we're starting past it. | |
92 | */ | |
93 | if (ctx->pos <= dotdot_offset) { | |
4740175e | 94 | ino = dp->d_ops->sf_get_parent_ino(sfp); |
4a8af273 DC |
95 | ctx->pos = dotdot_offset & 0x7fffffff; |
96 | if (!dir_emit(ctx, "..", 2, ino, DT_DIR)) | |
97 | return 0; | |
98 | } | |
99 | ||
100 | /* | |
101 | * Loop while there are more entries and put'ing works. | |
102 | */ | |
103 | sfep = xfs_dir2_sf_firstentry(sfp); | |
104 | for (i = 0; i < sfp->count; i++) { | |
c8ce540d | 105 | uint8_t filetype; |
0cb97766 | 106 | |
7dda6e86 | 107 | off = xfs_dir2_db_off_to_dataptr(geo, geo->datablk, |
4a8af273 DC |
108 | xfs_dir2_sf_get_offset(sfep)); |
109 | ||
110 | if (ctx->pos > off) { | |
32c5483a | 111 | sfep = dp->d_ops->sf_nextentry(sfp, sfep); |
4a8af273 DC |
112 | continue; |
113 | } | |
114 | ||
4740175e DC |
115 | ino = dp->d_ops->sf_get_ino(sfp, sfep); |
116 | filetype = dp->d_ops->sf_get_ftype(sfep); | |
4a8af273 | 117 | ctx->pos = off & 0x7fffffff; |
0cb97766 | 118 | if (!dir_emit(ctx, (char *)sfep->name, sfep->namelen, ino, |
53f82db0 | 119 | xfs_dir3_get_dtype(dp->i_mount, filetype))) |
4a8af273 | 120 | return 0; |
32c5483a | 121 | sfep = dp->d_ops->sf_nextentry(sfp, sfep); |
4a8af273 DC |
122 | } |
123 | ||
7dda6e86 | 124 | ctx->pos = xfs_dir2_db_off_to_dataptr(geo, geo->datablk + 1, 0) & |
53f82db0 | 125 | 0x7fffffff; |
4a8af273 DC |
126 | return 0; |
127 | } | |
128 | ||
129 | /* | |
130 | * Readdir for block directories. | |
131 | */ | |
132 | STATIC int | |
133 | xfs_dir2_block_getdents( | |
53f82db0 | 134 | struct xfs_da_args *args, |
4a8af273 DC |
135 | struct dir_context *ctx) |
136 | { | |
53f82db0 | 137 | struct xfs_inode *dp = args->dp; /* incore directory inode */ |
4a8af273 DC |
138 | xfs_dir2_data_hdr_t *hdr; /* block header */ |
139 | struct xfs_buf *bp; /* buffer for block */ | |
4a8af273 DC |
140 | xfs_dir2_data_entry_t *dep; /* block data entry */ |
141 | xfs_dir2_data_unused_t *dup; /* block unused entry */ | |
142 | char *endptr; /* end of the data entries */ | |
143 | int error; /* error return value */ | |
4a8af273 DC |
144 | char *ptr; /* current data entry */ |
145 | int wantoff; /* starting block offset */ | |
146 | xfs_off_t cook; | |
53f82db0 | 147 | struct xfs_da_geometry *geo = args->geo; |
dbad7c99 | 148 | int lock_mode; |
4a8af273 | 149 | |
4a8af273 DC |
150 | /* |
151 | * If the block number in the offset is out of range, we're done. | |
152 | */ | |
7dda6e86 | 153 | if (xfs_dir2_dataptr_to_db(geo, ctx->pos) > geo->datablk) |
4a8af273 DC |
154 | return 0; |
155 | ||
dbad7c99 | 156 | lock_mode = xfs_ilock_data_map_shared(dp); |
acb9553c | 157 | error = xfs_dir3_block_read(args->trans, dp, &bp); |
dbad7c99 | 158 | xfs_iunlock(dp, lock_mode); |
4a8af273 DC |
159 | if (error) |
160 | return error; | |
161 | ||
162 | /* | |
163 | * Extract the byte offset we start at from the seek pointer. | |
164 | * We'll skip entries before this. | |
165 | */ | |
30028030 | 166 | wantoff = xfs_dir2_dataptr_to_off(geo, ctx->pos); |
4a8af273 DC |
167 | hdr = bp->b_addr; |
168 | xfs_dir3_data_check(dp, bp); | |
169 | /* | |
170 | * Set up values for the loop. | |
171 | */ | |
2ca98774 | 172 | ptr = (char *)dp->d_ops->data_entry_p(hdr); |
ce92d29d | 173 | endptr = xfs_dir3_data_endp(geo, hdr); |
4a8af273 DC |
174 | |
175 | /* | |
176 | * Loop over the data portion of the block. | |
177 | * Each object is a real entry (dep) or an unused one (dup). | |
178 | */ | |
179 | while (ptr < endptr) { | |
c8ce540d | 180 | uint8_t filetype; |
0cb97766 | 181 | |
4a8af273 DC |
182 | dup = (xfs_dir2_data_unused_t *)ptr; |
183 | /* | |
184 | * Unused, skip it. | |
185 | */ | |
186 | if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) { | |
187 | ptr += be16_to_cpu(dup->length); | |
188 | continue; | |
189 | } | |
190 | ||
191 | dep = (xfs_dir2_data_entry_t *)ptr; | |
192 | ||
193 | /* | |
194 | * Bump pointer for the next iteration. | |
195 | */ | |
9d23fc85 | 196 | ptr += dp->d_ops->data_entsize(dep->namelen); |
4a8af273 DC |
197 | /* |
198 | * The entry is before the desired starting point, skip it. | |
199 | */ | |
200 | if ((char *)dep - (char *)hdr < wantoff) | |
201 | continue; | |
202 | ||
7dda6e86 | 203 | cook = xfs_dir2_db_off_to_dataptr(geo, geo->datablk, |
4a8af273 DC |
204 | (char *)dep - (char *)hdr); |
205 | ||
206 | ctx->pos = cook & 0x7fffffff; | |
9d23fc85 | 207 | filetype = dp->d_ops->data_get_ftype(dep); |
4a8af273 DC |
208 | /* |
209 | * If it didn't fit, set the final offset to here & return. | |
210 | */ | |
211 | if (!dir_emit(ctx, (char *)dep->name, dep->namelen, | |
0cb97766 | 212 | be64_to_cpu(dep->inumber), |
53f82db0 | 213 | xfs_dir3_get_dtype(dp->i_mount, filetype))) { |
acb9553c | 214 | xfs_trans_brelse(args->trans, bp); |
4a8af273 DC |
215 | return 0; |
216 | } | |
217 | } | |
218 | ||
219 | /* | |
220 | * Reached the end of the block. | |
221 | * Set the offset to a non-existent block 1 and return. | |
222 | */ | |
7dda6e86 | 223 | ctx->pos = xfs_dir2_db_off_to_dataptr(geo, geo->datablk + 1, 0) & |
53f82db0 | 224 | 0x7fffffff; |
acb9553c | 225 | xfs_trans_brelse(args->trans, bp); |
4a8af273 DC |
226 | return 0; |
227 | } | |
228 | ||
d205a7d0 DW |
229 | /* |
230 | * Read a directory block and initiate readahead for blocks beyond that. | |
231 | * We maintain a sliding readahead window of the remaining space in the | |
232 | * buffer rounded up to the nearest block. | |
233 | */ | |
4a8af273 DC |
234 | STATIC int |
235 | xfs_dir2_leaf_readbuf( | |
53f82db0 | 236 | struct xfs_da_args *args, |
4a8af273 | 237 | size_t bufsize, |
d205a7d0 DW |
238 | xfs_dir2_off_t *cur_off, |
239 | xfs_dablk_t *ra_blk, | |
240 | struct xfs_buf **bpp) | |
4a8af273 | 241 | { |
53f82db0 | 242 | struct xfs_inode *dp = args->dp; |
9f541801 | 243 | struct xfs_buf *bp = NULL; |
d205a7d0 DW |
244 | struct xfs_da_geometry *geo = args->geo; |
245 | struct xfs_ifork *ifp = XFS_IFORK_PTR(dp, XFS_DATA_FORK); | |
246 | struct xfs_bmbt_irec map; | |
4a8af273 | 247 | struct blk_plug plug; |
d205a7d0 DW |
248 | xfs_dir2_off_t new_off; |
249 | xfs_dablk_t next_ra; | |
250 | xfs_dablk_t map_off; | |
251 | xfs_dablk_t last_da; | |
b2b1712a | 252 | struct xfs_iext_cursor icur; |
d205a7d0 | 253 | int ra_want; |
4a8af273 | 254 | int error = 0; |
4a8af273 | 255 | |
d205a7d0 DW |
256 | if (!(ifp->if_flags & XFS_IFEXTENTS)) { |
257 | error = xfs_iread_extents(args->trans, dp, XFS_DATA_FORK); | |
4a8af273 | 258 | if (error) |
d205a7d0 | 259 | goto out; |
4a8af273 DC |
260 | } |
261 | ||
262 | /* | |
d205a7d0 DW |
263 | * Look for mapped directory blocks at or above the current offset. |
264 | * Truncate down to the nearest directory block to start the scanning | |
265 | * operation. | |
4a8af273 | 266 | */ |
d205a7d0 DW |
267 | last_da = xfs_dir2_byte_to_da(geo, XFS_DIR2_LEAF_OFFSET); |
268 | map_off = xfs_dir2_db_to_da(geo, xfs_dir2_byte_to_db(geo, *cur_off)); | |
b2b1712a | 269 | if (!xfs_iext_lookup_extent(dp, ifp, map_off, &icur, &map)) |
4a8af273 | 270 | goto out; |
d205a7d0 DW |
271 | if (map.br_startoff >= last_da) |
272 | goto out; | |
273 | xfs_trim_extent(&map, map_off, last_da - map_off); | |
4a8af273 | 274 | |
d205a7d0 DW |
275 | /* Read the directory block of that first mapping. */ |
276 | new_off = xfs_dir2_da_to_byte(geo, map.br_startoff); | |
277 | if (new_off > *cur_off) | |
278 | *cur_off = new_off; | |
279 | error = xfs_dir3_data_read(args->trans, dp, map.br_startoff, -1, &bp); | |
4a8af273 | 280 | if (error) |
d205a7d0 | 281 | goto out; |
4a8af273 DC |
282 | |
283 | /* | |
d205a7d0 DW |
284 | * Start readahead for the next bufsize's worth of dir data blocks. |
285 | * We may have already issued readahead for some of that range; | |
286 | * ra_blk tracks the last block we tried to read(ahead). | |
4a8af273 | 287 | */ |
d205a7d0 DW |
288 | ra_want = howmany(bufsize + geo->blksize, (1 << geo->fsblog)); |
289 | if (*ra_blk >= last_da) | |
290 | goto out; | |
291 | else if (*ra_blk == 0) | |
292 | *ra_blk = map.br_startoff; | |
293 | next_ra = map.br_startoff + geo->fsbcount; | |
294 | if (next_ra >= last_da) | |
295 | goto out_no_ra; | |
296 | if (map.br_blockcount < geo->fsbcount && | |
b2b1712a | 297 | !xfs_iext_next_extent(ifp, &icur, &map)) |
d205a7d0 DW |
298 | goto out_no_ra; |
299 | if (map.br_startoff >= last_da) | |
300 | goto out_no_ra; | |
301 | xfs_trim_extent(&map, next_ra, last_da - next_ra); | |
302 | ||
303 | /* Start ra for each dir (not fs) block that has a mapping. */ | |
4a8af273 | 304 | blk_start_plug(&plug); |
d205a7d0 DW |
305 | while (ra_want > 0) { |
306 | next_ra = roundup((xfs_dablk_t)map.br_startoff, geo->fsbcount); | |
307 | while (ra_want > 0 && | |
308 | next_ra < map.br_startoff + map.br_blockcount) { | |
309 | if (next_ra >= last_da) { | |
310 | *ra_blk = last_da; | |
311 | break; | |
312 | } | |
313 | if (next_ra > *ra_blk) { | |
314 | xfs_dir3_data_readahead(dp, next_ra, -2); | |
315 | *ra_blk = next_ra; | |
4a8af273 | 316 | } |
d205a7d0 DW |
317 | ra_want -= geo->fsbcount; |
318 | next_ra += geo->fsbcount; | |
319 | } | |
b2b1712a | 320 | if (!xfs_iext_next_extent(ifp, &icur, &map)) { |
d205a7d0 DW |
321 | *ra_blk = last_da; |
322 | break; | |
4a8af273 DC |
323 | } |
324 | } | |
325 | blk_finish_plug(&plug); | |
326 | ||
327 | out: | |
328 | *bpp = bp; | |
329 | return error; | |
d205a7d0 DW |
330 | out_no_ra: |
331 | *ra_blk = last_da; | |
332 | goto out; | |
4a8af273 DC |
333 | } |
334 | ||
335 | /* | |
336 | * Getdents (readdir) for leaf and node directories. | |
337 | * This reads the data blocks only, so is the same for both forms. | |
338 | */ | |
339 | STATIC int | |
340 | xfs_dir2_leaf_getdents( | |
53f82db0 | 341 | struct xfs_da_args *args, |
4a8af273 DC |
342 | struct dir_context *ctx, |
343 | size_t bufsize) | |
344 | { | |
53f82db0 | 345 | struct xfs_inode *dp = args->dp; |
4a8af273 DC |
346 | struct xfs_buf *bp = NULL; /* data block buffer */ |
347 | xfs_dir2_data_hdr_t *hdr; /* data block header */ | |
348 | xfs_dir2_data_entry_t *dep; /* data entry */ | |
349 | xfs_dir2_data_unused_t *dup; /* unused entry */ | |
4a8af273 | 350 | char *ptr = NULL; /* pointer to current data */ |
53f82db0 | 351 | struct xfs_da_geometry *geo = args->geo; |
d205a7d0 DW |
352 | xfs_dablk_t rablk = 0; /* current readahead block */ |
353 | xfs_dir2_off_t curoff; /* current overall offset */ | |
354 | int length; /* temporary length value */ | |
355 | int byteoff; /* offset in current block */ | |
356 | int lock_mode; | |
357 | int error = 0; /* error return value */ | |
4a8af273 DC |
358 | |
359 | /* | |
360 | * If the offset is at or past the largest allowed value, | |
361 | * give up right away. | |
362 | */ | |
363 | if (ctx->pos >= XFS_DIR2_MAX_DATAPTR) | |
364 | return 0; | |
365 | ||
4a8af273 DC |
366 | /* |
367 | * Inside the loop we keep the main offset value as a byte offset | |
368 | * in the directory file. | |
369 | */ | |
25994053 | 370 | curoff = xfs_dir2_dataptr_to_byte(ctx->pos); |
4a8af273 | 371 | |
4a8af273 DC |
372 | /* |
373 | * Loop over directory entries until we reach the end offset. | |
374 | * Get more blocks and readahead as necessary. | |
375 | */ | |
376 | while (curoff < XFS_DIR2_LEAF_OFFSET) { | |
c8ce540d | 377 | uint8_t filetype; |
0cb97766 | 378 | |
4a8af273 DC |
379 | /* |
380 | * If we have no buffer, or we're off the end of the | |
381 | * current buffer, need to get another one. | |
382 | */ | |
8f66193c | 383 | if (!bp || ptr >= (char *)bp->b_addr + geo->blksize) { |
9f541801 | 384 | if (bp) { |
d205a7d0 | 385 | xfs_trans_brelse(args->trans, bp); |
9f541801 | 386 | bp = NULL; |
9f541801 | 387 | } |
4a8af273 | 388 | |
dbad7c99 | 389 | lock_mode = xfs_ilock_data_map_shared(dp); |
d205a7d0 DW |
390 | error = xfs_dir2_leaf_readbuf(args, bufsize, &curoff, |
391 | &rablk, &bp); | |
dbad7c99 | 392 | xfs_iunlock(dp, lock_mode); |
d205a7d0 | 393 | if (error || !bp) |
4a8af273 DC |
394 | break; |
395 | ||
4a8af273 DC |
396 | hdr = bp->b_addr; |
397 | xfs_dir3_data_check(dp, bp); | |
398 | /* | |
399 | * Find our position in the block. | |
400 | */ | |
2ca98774 | 401 | ptr = (char *)dp->d_ops->data_entry_p(hdr); |
53f82db0 | 402 | byteoff = xfs_dir2_byte_to_off(geo, curoff); |
4a8af273 DC |
403 | /* |
404 | * Skip past the header. | |
405 | */ | |
406 | if (byteoff == 0) | |
1c9a5b2e | 407 | curoff += dp->d_ops->data_entry_offset; |
4a8af273 DC |
408 | /* |
409 | * Skip past entries until we reach our offset. | |
410 | */ | |
411 | else { | |
412 | while ((char *)ptr - (char *)hdr < byteoff) { | |
413 | dup = (xfs_dir2_data_unused_t *)ptr; | |
414 | ||
415 | if (be16_to_cpu(dup->freetag) | |
416 | == XFS_DIR2_DATA_FREE_TAG) { | |
417 | ||
418 | length = be16_to_cpu(dup->length); | |
419 | ptr += length; | |
420 | continue; | |
421 | } | |
422 | dep = (xfs_dir2_data_entry_t *)ptr; | |
423 | length = | |
9d23fc85 | 424 | dp->d_ops->data_entsize(dep->namelen); |
4a8af273 DC |
425 | ptr += length; |
426 | } | |
427 | /* | |
428 | * Now set our real offset. | |
429 | */ | |
430 | curoff = | |
30028030 DC |
431 | xfs_dir2_db_off_to_byte(geo, |
432 | xfs_dir2_byte_to_db(geo, curoff), | |
4a8af273 | 433 | (char *)ptr - (char *)hdr); |
8f66193c | 434 | if (ptr >= (char *)hdr + geo->blksize) { |
4a8af273 DC |
435 | continue; |
436 | } | |
437 | } | |
438 | } | |
439 | /* | |
440 | * We have a pointer to an entry. | |
441 | * Is it a live one? | |
442 | */ | |
443 | dup = (xfs_dir2_data_unused_t *)ptr; | |
444 | /* | |
445 | * No, it's unused, skip over it. | |
446 | */ | |
447 | if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) { | |
448 | length = be16_to_cpu(dup->length); | |
449 | ptr += length; | |
450 | curoff += length; | |
451 | continue; | |
452 | } | |
453 | ||
454 | dep = (xfs_dir2_data_entry_t *)ptr; | |
9d23fc85 DC |
455 | length = dp->d_ops->data_entsize(dep->namelen); |
456 | filetype = dp->d_ops->data_get_ftype(dep); | |
4a8af273 | 457 | |
25994053 | 458 | ctx->pos = xfs_dir2_byte_to_dataptr(curoff) & 0x7fffffff; |
4a8af273 | 459 | if (!dir_emit(ctx, (char *)dep->name, dep->namelen, |
0cb97766 | 460 | be64_to_cpu(dep->inumber), |
53f82db0 | 461 | xfs_dir3_get_dtype(dp->i_mount, filetype))) |
4a8af273 DC |
462 | break; |
463 | ||
464 | /* | |
465 | * Advance to next entry in the block. | |
466 | */ | |
467 | ptr += length; | |
468 | curoff += length; | |
469 | /* bufsize may have just been a guess; don't go negative */ | |
470 | bufsize = bufsize > length ? bufsize - length : 0; | |
471 | } | |
472 | ||
473 | /* | |
474 | * All done. Set output offset value to current offset. | |
475 | */ | |
25994053 | 476 | if (curoff > xfs_dir2_dataptr_to_byte(XFS_DIR2_MAX_DATAPTR)) |
4a8af273 DC |
477 | ctx->pos = XFS_DIR2_MAX_DATAPTR & 0x7fffffff; |
478 | else | |
25994053 | 479 | ctx->pos = xfs_dir2_byte_to_dataptr(curoff) & 0x7fffffff; |
4a8af273 | 480 | if (bp) |
acb9553c | 481 | xfs_trans_brelse(args->trans, bp); |
4a8af273 DC |
482 | return error; |
483 | } | |
484 | ||
485 | /* | |
486 | * Read a directory. | |
acb9553c DW |
487 | * |
488 | * If supplied, the transaction collects locked dir buffers to avoid | |
489 | * nested buffer deadlocks. This function does not dirty the | |
490 | * transaction. The caller should ensure that the inode is locked | |
491 | * before calling this function. | |
4a8af273 DC |
492 | */ |
493 | int | |
494 | xfs_readdir( | |
acb9553c | 495 | struct xfs_trans *tp, |
53f82db0 DC |
496 | struct xfs_inode *dp, |
497 | struct dir_context *ctx, | |
498 | size_t bufsize) | |
4a8af273 | 499 | { |
35f46c5f | 500 | struct xfs_da_args args = { NULL }; |
53f82db0 DC |
501 | int rval; |
502 | int v; | |
4a8af273 DC |
503 | |
504 | trace_xfs_readdir(dp); | |
505 | ||
506 | if (XFS_FORCED_SHUTDOWN(dp->i_mount)) | |
2451337d | 507 | return -EIO; |
4a8af273 | 508 | |
c19b3b05 | 509 | ASSERT(S_ISDIR(VFS_I(dp)->i_mode)); |
ff6d6af2 | 510 | XFS_STATS_INC(dp->i_mount, xs_dir_getdents); |
4a8af273 | 511 | |
53f82db0 DC |
512 | args.dp = dp; |
513 | args.geo = dp->i_mount->m_dir_geo; | |
acb9553c | 514 | args.trans = tp; |
53f82db0 | 515 | |
4a8af273 | 516 | if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) |
53f82db0 DC |
517 | rval = xfs_dir2_sf_getdents(&args, ctx); |
518 | else if ((rval = xfs_dir2_isblock(&args, &v))) | |
4a8af273 DC |
519 | ; |
520 | else if (v) | |
53f82db0 | 521 | rval = xfs_dir2_block_getdents(&args, ctx); |
4a8af273 | 522 | else |
53f82db0 | 523 | rval = xfs_dir2_leaf_getdents(&args, ctx, bufsize); |
40194ecc | 524 | |
4a8af273 DC |
525 | return rval; |
526 | } |