]>
Commit | Line | Data |
---|---|---|
2bd0ea18 | 1 | /* |
da23017d NS |
2 | * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc. |
3 | * All Rights Reserved. | |
5000d01d | 4 | * |
da23017d NS |
5 | * This program is free software; you can redistribute it and/or |
6 | * modify it under the terms of the GNU General Public License as | |
2bd0ea18 | 7 | * published by the Free Software Foundation. |
5000d01d | 8 | * |
da23017d NS |
9 | * This program is distributed in the hope that it would be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
5000d01d | 13 | * |
da23017d NS |
14 | * You should have received a copy of the GNU General Public License |
15 | * along with this program; if not, write the Free Software Foundation, | |
16 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
2bd0ea18 | 17 | */ |
9c799827 | 18 | #include "libxfs_priv.h" |
b626fb59 DC |
19 | #include "xfs_fs.h" |
20 | #include "xfs_format.h" | |
21 | #include "xfs_log_format.h" | |
22 | #include "xfs_trans_resv.h" | |
23 | #include "xfs_mount.h" | |
24 | #include "xfs_da_format.h" | |
25 | #include "xfs_da_btree.h" | |
26 | #include "xfs_inode.h" | |
27 | #include "xfs_trans.h" | |
28 | #include "xfs_bmap.h" | |
29 | #include "xfs_dir2.h" | |
30 | #include "xfs_dir2_priv.h" | |
31 | #include "xfs_trace.h" | |
2bd0ea18 | 32 | |
494434d7 DC |
33 | struct xfs_name xfs_name_dotdot = { (unsigned char *)"..", 2, XFS_DIR3_FT_DIR }; |
34 | ||
aaca101b DC |
35 | /* |
36 | * @mode, if set, indicates that the type field needs to be set up. | |
37 | * This uses the transformation from file mode to DT_* as defined in linux/fs.h | |
38 | * for file type specification. This will be propagated into the directory | |
39 | * structure if appropriate for the given operation and filesystem config. | |
40 | */ | |
41 | const unsigned char xfs_mode_to_ftype[S_IFMT >> S_SHIFT] = { | |
5a35bf2c DC |
42 | [0] = XFS_DIR3_FT_UNKNOWN, |
43 | [S_IFREG >> S_SHIFT] = XFS_DIR3_FT_REG_FILE, | |
44 | [S_IFDIR >> S_SHIFT] = XFS_DIR3_FT_DIR, | |
45 | [S_IFCHR >> S_SHIFT] = XFS_DIR3_FT_CHRDEV, | |
46 | [S_IFBLK >> S_SHIFT] = XFS_DIR3_FT_BLKDEV, | |
47 | [S_IFIFO >> S_SHIFT] = XFS_DIR3_FT_FIFO, | |
48 | [S_IFSOCK >> S_SHIFT] = XFS_DIR3_FT_SOCK, | |
49 | [S_IFLNK >> S_SHIFT] = XFS_DIR3_FT_SYMLINK, | |
aaca101b | 50 | }; |
51ca7008 BN |
51 | |
52 | /* | |
5e656dbb BN |
53 | * ASCII case-insensitive (ie. A-Z) support for directories that was |
54 | * used in IRIX. | |
51ca7008 | 55 | */ |
5e656dbb | 56 | STATIC xfs_dahash_t |
51ca7008 | 57 | xfs_ascii_ci_hashname( |
5e656dbb | 58 | struct xfs_name *name) |
51ca7008 BN |
59 | { |
60 | xfs_dahash_t hash; | |
61 | int i; | |
62 | ||
5e656dbb BN |
63 | for (i = 0, hash = 0; i < name->len; i++) |
64 | hash = tolower(name->name[i]) ^ rol32(hash, 7); | |
51ca7008 BN |
65 | |
66 | return hash; | |
67 | } | |
68 | ||
5e656dbb | 69 | STATIC enum xfs_dacmp |
51ca7008 | 70 | xfs_ascii_ci_compname( |
5e656dbb | 71 | struct xfs_da_args *args, |
56b2de80 DC |
72 | const unsigned char *name, |
73 | int len) | |
51ca7008 BN |
74 | { |
75 | enum xfs_dacmp result; | |
76 | int i; | |
77 | ||
5e656dbb | 78 | if (args->namelen != len) |
51ca7008 BN |
79 | return XFS_CMP_DIFFERENT; |
80 | ||
81 | result = XFS_CMP_EXACT; | |
5e656dbb BN |
82 | for (i = 0; i < len; i++) { |
83 | if (args->name[i] == name[i]) | |
51ca7008 | 84 | continue; |
5e656dbb | 85 | if (tolower(args->name[i]) != tolower(name[i])) |
51ca7008 BN |
86 | return XFS_CMP_DIFFERENT; |
87 | result = XFS_CMP_CASE; | |
88 | } | |
89 | ||
90 | return result; | |
91 | } | |
92 | ||
5e656dbb | 93 | static struct xfs_nameops xfs_ascii_ci_nameops = { |
51ca7008 BN |
94 | .hashname = xfs_ascii_ci_hashname, |
95 | .compname = xfs_ascii_ci_compname, | |
96 | }; | |
97 | ||
ff105f75 DC |
98 | int |
99 | xfs_da_mount( | |
100 | struct xfs_mount *mp) | |
2bd0ea18 | 101 | { |
ff105f75 DC |
102 | struct xfs_da_geometry *dageo; |
103 | int nodehdr_size; | |
ed59338e DC |
104 | |
105 | ||
ff105f75 | 106 | ASSERT(mp->m_sb.sb_versionnum & XFS_SB_VERSION_DIRV2BIT); |
2bd0ea18 NS |
107 | ASSERT((1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog)) <= |
108 | XFS_MAX_BLOCKSIZE); | |
ff105f75 DC |
109 | |
110 | mp->m_dir_inode_ops = xfs_dir_get_ops(mp, NULL); | |
111 | mp->m_nondir_inode_ops = xfs_nondir_get_ops(mp, NULL); | |
112 | ||
113 | nodehdr_size = mp->m_dir_inode_ops->node_hdr_size; | |
114 | mp->m_dir_geo = kmem_zalloc(sizeof(struct xfs_da_geometry), | |
115 | KM_SLEEP | KM_MAYFAIL); | |
116 | mp->m_attr_geo = kmem_zalloc(sizeof(struct xfs_da_geometry), | |
117 | KM_SLEEP | KM_MAYFAIL); | |
118 | if (!mp->m_dir_geo || !mp->m_attr_geo) { | |
119 | kmem_free(mp->m_dir_geo); | |
120 | kmem_free(mp->m_attr_geo); | |
12b53197 | 121 | return -ENOMEM; |
ff105f75 DC |
122 | } |
123 | ||
124 | /* set up directory geometry */ | |
125 | dageo = mp->m_dir_geo; | |
126 | dageo->blklog = mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog; | |
127 | dageo->fsblog = mp->m_sb.sb_blocklog; | |
128 | dageo->blksize = 1 << dageo->blklog; | |
129 | dageo->fsbcount = 1 << mp->m_sb.sb_dirblklog; | |
130 | ||
131 | /* | |
132 | * Now we've set up the block conversion variables, we can calculate the | |
133 | * segment block constants using the geometry structure. | |
134 | */ | |
135 | dageo->datablk = xfs_dir2_byte_to_da(dageo, XFS_DIR2_DATA_OFFSET); | |
136 | dageo->leafblk = xfs_dir2_byte_to_da(dageo, XFS_DIR2_LEAF_OFFSET); | |
137 | dageo->freeblk = xfs_dir2_byte_to_da(dageo, XFS_DIR2_FREE_OFFSET); | |
138 | dageo->node_ents = (dageo->blksize - nodehdr_size) / | |
ed59338e | 139 | (uint)sizeof(xfs_da_node_entry_t); |
ff105f75 DC |
140 | dageo->magicpct = (dageo->blksize * 37) / 100; |
141 | ||
142 | /* set up attribute geometry - single fsb only */ | |
143 | dageo = mp->m_attr_geo; | |
144 | dageo->blklog = mp->m_sb.sb_blocklog; | |
145 | dageo->fsblog = mp->m_sb.sb_blocklog; | |
146 | dageo->blksize = 1 << dageo->blklog; | |
147 | dageo->fsbcount = 1; | |
148 | dageo->node_ents = (dageo->blksize - nodehdr_size) / | |
ed59338e | 149 | (uint)sizeof(xfs_da_node_entry_t); |
ff105f75 | 150 | dageo->magicpct = (dageo->blksize * 37) / 100; |
ed59338e | 151 | |
51ca7008 BN |
152 | if (xfs_sb_version_hasasciici(&mp->m_sb)) |
153 | mp->m_dirnameops = &xfs_ascii_ci_nameops; | |
154 | else | |
155 | mp->m_dirnameops = &xfs_default_nameops; | |
ff105f75 DC |
156 | |
157 | return 0; | |
158 | } | |
159 | ||
160 | void | |
161 | xfs_da_unmount( | |
162 | struct xfs_mount *mp) | |
163 | { | |
164 | kmem_free(mp->m_dir_geo); | |
165 | kmem_free(mp->m_attr_geo); | |
2bd0ea18 NS |
166 | } |
167 | ||
5e656dbb BN |
168 | /* |
169 | * Return 1 if directory contains only "." and "..". | |
170 | */ | |
171 | int | |
172 | xfs_dir_isempty( | |
173 | xfs_inode_t *dp) | |
174 | { | |
a2ceac1f | 175 | xfs_dir2_sf_hdr_t *sfp; |
5e656dbb | 176 | |
a2ceac1f | 177 | ASSERT(S_ISDIR(dp->i_d.di_mode)); |
5e656dbb BN |
178 | if (dp->i_d.di_size == 0) /* might happen during shutdown. */ |
179 | return 1; | |
180 | if (dp->i_d.di_size > XFS_IFORK_DSIZE(dp)) | |
181 | return 0; | |
a2ceac1f DC |
182 | sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data; |
183 | return !sfp->count; | |
5e656dbb BN |
184 | } |
185 | ||
186 | /* | |
187 | * Validate a given inode number. | |
188 | */ | |
189 | int | |
190 | xfs_dir_ino_validate( | |
191 | xfs_mount_t *mp, | |
192 | xfs_ino_t ino) | |
193 | { | |
194 | xfs_agblock_t agblkno; | |
195 | xfs_agino_t agino; | |
196 | xfs_agnumber_t agno; | |
197 | int ino_ok; | |
198 | int ioff; | |
199 | ||
200 | agno = XFS_INO_TO_AGNO(mp, ino); | |
201 | agblkno = XFS_INO_TO_AGBNO(mp, ino); | |
202 | ioff = XFS_INO_TO_OFFSET(mp, ino); | |
203 | agino = XFS_OFFBNO_TO_AGINO(mp, agblkno, ioff); | |
204 | ino_ok = | |
205 | agno < mp->m_sb.sb_agcount && | |
206 | agblkno < mp->m_sb.sb_agblocks && | |
207 | agblkno != 0 && | |
208 | ioff < (1 << mp->m_sb.sb_inopblog) && | |
209 | XFS_AGINO_TO_INO(mp, agno, agino) == ino; | |
210 | if (unlikely(XFS_TEST_ERROR(!ino_ok, mp, XFS_ERRTAG_DIR_INO_VALIDATE, | |
211 | XFS_RANDOM_DIR_INO_VALIDATE))) { | |
a2ceac1f | 212 | xfs_warn(mp, "Invalid inode number 0x%Lx", |
5e656dbb BN |
213 | (unsigned long long) ino); |
214 | XFS_ERROR_REPORT("xfs_dir_ino_validate", XFS_ERRLEVEL_LOW, mp); | |
12b53197 | 215 | return -EFSCORRUPTED; |
5e656dbb BN |
216 | } |
217 | return 0; | |
218 | } | |
219 | ||
2bd0ea18 NS |
220 | /* |
221 | * Initialize a directory with its "." and ".." entries. | |
222 | */ | |
5e656dbb BN |
223 | int |
224 | xfs_dir_init( | |
225 | xfs_trans_t *tp, | |
226 | xfs_inode_t *dp, | |
227 | xfs_inode_t *pdp) | |
2bd0ea18 | 228 | { |
ff105f75 | 229 | struct xfs_da_args *args; |
5e656dbb | 230 | int error; |
2bd0ea18 | 231 | |
a2ceac1f | 232 | ASSERT(S_ISDIR(dp->i_d.di_mode)); |
ff105f75 DC |
233 | error = xfs_dir_ino_validate(tp->t_mountp, pdp->i_ino); |
234 | if (error) | |
2bd0ea18 | 235 | return error; |
ff105f75 DC |
236 | |
237 | args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS); | |
238 | if (!args) | |
12b53197 | 239 | return -ENOMEM; |
ff105f75 DC |
240 | |
241 | args->geo = dp->i_mount->m_dir_geo; | |
242 | args->dp = dp; | |
243 | args->trans = tp; | |
244 | error = xfs_dir2_sf_create(args, pdp->i_ino); | |
245 | kmem_free(args); | |
246 | return error; | |
2bd0ea18 NS |
247 | } |
248 | ||
249 | /* | |
5a35bf2c DC |
250 | * Enter a name in a directory, or check for available space. |
251 | * If inum is 0, only the available space test is performed. | |
2bd0ea18 | 252 | */ |
5e656dbb BN |
253 | int |
254 | xfs_dir_createname( | |
255 | xfs_trans_t *tp, | |
256 | xfs_inode_t *dp, | |
257 | struct xfs_name *name, | |
2bd0ea18 NS |
258 | xfs_ino_t inum, /* new entry inode number */ |
259 | xfs_fsblock_t *first, /* bmap's firstblock */ | |
260 | xfs_bmap_free_t *flist, /* bmap's freeblock list */ | |
261 | xfs_extlen_t total) /* bmap's total block count */ | |
262 | { | |
ff105f75 | 263 | struct xfs_da_args *args; |
5e656dbb | 264 | int rval; |
2bd0ea18 NS |
265 | int v; /* type-checking value */ |
266 | ||
a2ceac1f | 267 | ASSERT(S_ISDIR(dp->i_d.di_mode)); |
5a35bf2c DC |
268 | if (inum) { |
269 | rval = xfs_dir_ino_validate(tp->t_mountp, inum); | |
270 | if (rval) | |
271 | return rval; | |
272 | XFS_STATS_INC(xs_dir_create); | |
273 | } | |
5e656dbb | 274 | |
ff105f75 DC |
275 | args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS); |
276 | if (!args) | |
12b53197 | 277 | return -ENOMEM; |
ff105f75 DC |
278 | |
279 | args->geo = dp->i_mount->m_dir_geo; | |
280 | args->name = name->name; | |
281 | args->namelen = name->len; | |
282 | args->filetype = name->type; | |
283 | args->hashval = dp->i_mount->m_dirnameops->hashname(name); | |
284 | args->inumber = inum; | |
285 | args->dp = dp; | |
286 | args->firstblock = first; | |
287 | args->flist = flist; | |
288 | args->total = total; | |
289 | args->whichfork = XFS_DATA_FORK; | |
290 | args->trans = tp; | |
291 | args->op_flags = XFS_DA_OP_ADDNAME | XFS_DA_OP_OKNOENT; | |
5a35bf2c DC |
292 | if (!inum) |
293 | args->op_flags |= XFS_DA_OP_JUSTCHECK; | |
ff105f75 DC |
294 | |
295 | if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) { | |
296 | rval = xfs_dir2_sf_addname(args); | |
297 | goto out_free; | |
298 | } | |
299 | ||
300 | rval = xfs_dir2_isblock(args, &v); | |
301 | if (rval) | |
302 | goto out_free; | |
303 | if (v) { | |
304 | rval = xfs_dir2_block_addname(args); | |
305 | goto out_free; | |
306 | } | |
307 | ||
308 | rval = xfs_dir2_isleaf(args, &v); | |
309 | if (rval) | |
310 | goto out_free; | |
311 | if (v) | |
312 | rval = xfs_dir2_leaf_addname(args); | |
2bd0ea18 | 313 | else |
ff105f75 DC |
314 | rval = xfs_dir2_node_addname(args); |
315 | ||
316 | out_free: | |
317 | kmem_free(args); | |
2bd0ea18 NS |
318 | return rval; |
319 | } | |
320 | ||
5e656dbb BN |
321 | /* |
322 | * If doing a CI lookup and case-insensitive match, dup actual name into | |
323 | * args.value. Return EEXIST for success (ie. name found) or an error. | |
324 | */ | |
325 | int | |
326 | xfs_dir_cilookup_result( | |
327 | struct xfs_da_args *args, | |
56b2de80 | 328 | const unsigned char *name, |
5e656dbb BN |
329 | int len) |
330 | { | |
331 | if (args->cmpresult == XFS_CMP_DIFFERENT) | |
12b53197 | 332 | return -ENOENT; |
5e656dbb BN |
333 | if (args->cmpresult != XFS_CMP_CASE || |
334 | !(args->op_flags & XFS_DA_OP_CILOOKUP)) | |
12b53197 | 335 | return -EEXIST; |
5e656dbb | 336 | |
56b2de80 | 337 | args->value = kmem_alloc(len, KM_NOFS | KM_MAYFAIL); |
5e656dbb | 338 | if (!args->value) |
12b53197 | 339 | return -ENOMEM; |
5e656dbb BN |
340 | |
341 | memcpy(args->value, name, len); | |
342 | args->valuelen = len; | |
12b53197 | 343 | return -EEXIST; |
5e656dbb BN |
344 | } |
345 | ||
2bd0ea18 NS |
346 | /* |
347 | * Lookup a name in a directory, give back the inode number. | |
5e656dbb BN |
348 | * If ci_name is not NULL, returns the actual name in ci_name if it differs |
349 | * to name, or ci_name->name is set to NULL for an exact match. | |
2bd0ea18 | 350 | */ |
5e656dbb BN |
351 | |
352 | int | |
353 | xfs_dir_lookup( | |
354 | xfs_trans_t *tp, | |
355 | xfs_inode_t *dp, | |
356 | struct xfs_name *name, | |
357 | xfs_ino_t *inum, /* out: inode number */ | |
358 | struct xfs_name *ci_name) /* out: actual name if CI match */ | |
2bd0ea18 | 359 | { |
ff105f75 | 360 | struct xfs_da_args *args; |
5e656dbb | 361 | int rval; |
2bd0ea18 NS |
362 | int v; /* type-checking value */ |
363 | ||
a2ceac1f | 364 | ASSERT(S_ISDIR(dp->i_d.di_mode)); |
32a82561 | 365 | XFS_STATS_INC(xs_dir_lookup); |
a95cf252 | 366 | |
ff105f75 DC |
367 | /* |
368 | * We need to use KM_NOFS here so that lockdep will not throw false | |
369 | * positive deadlock warnings on a non-transactional lookup path. It is | |
370 | * safe to recurse into inode recalim in that case, but lockdep can't | |
371 | * easily be taught about it. Hence KM_NOFS avoids having to add more | |
372 | * lockdep Doing this avoids having to add a bunch of lockdep class | |
373 | * annotations into the reclaim path for the ilock. | |
374 | */ | |
375 | args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS); | |
376 | args->geo = dp->i_mount->m_dir_geo; | |
377 | args->name = name->name; | |
378 | args->namelen = name->len; | |
379 | args->filetype = name->type; | |
380 | args->hashval = dp->i_mount->m_dirnameops->hashname(name); | |
381 | args->dp = dp; | |
382 | args->whichfork = XFS_DATA_FORK; | |
383 | args->trans = tp; | |
384 | args->op_flags = XFS_DA_OP_OKNOENT; | |
5e656dbb | 385 | if (ci_name) |
ff105f75 | 386 | args->op_flags |= XFS_DA_OP_CILOOKUP; |
5e656dbb | 387 | |
ff105f75 DC |
388 | if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) { |
389 | rval = xfs_dir2_sf_lookup(args); | |
390 | goto out_check_rval; | |
391 | } | |
392 | ||
393 | rval = xfs_dir2_isblock(args, &v); | |
394 | if (rval) | |
395 | goto out_free; | |
396 | if (v) { | |
397 | rval = xfs_dir2_block_lookup(args); | |
398 | goto out_check_rval; | |
399 | } | |
400 | ||
401 | rval = xfs_dir2_isleaf(args, &v); | |
402 | if (rval) | |
403 | goto out_free; | |
404 | if (v) | |
405 | rval = xfs_dir2_leaf_lookup(args); | |
2bd0ea18 | 406 | else |
ff105f75 DC |
407 | rval = xfs_dir2_node_lookup(args); |
408 | ||
409 | out_check_rval: | |
12b53197 | 410 | if (rval == -EEXIST) |
2bd0ea18 | 411 | rval = 0; |
5e656dbb | 412 | if (!rval) { |
ff105f75 | 413 | *inum = args->inumber; |
5e656dbb | 414 | if (ci_name) { |
ff105f75 DC |
415 | ci_name->name = args->value; |
416 | ci_name->len = args->valuelen; | |
5e656dbb BN |
417 | } |
418 | } | |
ff105f75 DC |
419 | out_free: |
420 | kmem_free(args); | |
2bd0ea18 NS |
421 | return rval; |
422 | } | |
423 | ||
424 | /* | |
425 | * Remove an entry from a directory. | |
426 | */ | |
5e656dbb BN |
427 | int |
428 | xfs_dir_removename( | |
429 | xfs_trans_t *tp, | |
430 | xfs_inode_t *dp, | |
431 | struct xfs_name *name, | |
432 | xfs_ino_t ino, | |
2bd0ea18 | 433 | xfs_fsblock_t *first, /* bmap's firstblock */ |
dfc130f3 | 434 | xfs_bmap_free_t *flist, /* bmap's freeblock list */ |
2bd0ea18 NS |
435 | xfs_extlen_t total) /* bmap's total block count */ |
436 | { | |
ff105f75 | 437 | struct xfs_da_args *args; |
5e656dbb | 438 | int rval; |
2bd0ea18 NS |
439 | int v; /* type-checking value */ |
440 | ||
a2ceac1f | 441 | ASSERT(S_ISDIR(dp->i_d.di_mode)); |
32a82561 | 442 | XFS_STATS_INC(xs_dir_remove); |
5e656dbb | 443 | |
ff105f75 DC |
444 | args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS); |
445 | if (!args) | |
12b53197 | 446 | return -ENOMEM; |
ff105f75 DC |
447 | |
448 | args->geo = dp->i_mount->m_dir_geo; | |
449 | args->name = name->name; | |
450 | args->namelen = name->len; | |
451 | args->filetype = name->type; | |
452 | args->hashval = dp->i_mount->m_dirnameops->hashname(name); | |
453 | args->inumber = ino; | |
454 | args->dp = dp; | |
455 | args->firstblock = first; | |
456 | args->flist = flist; | |
457 | args->total = total; | |
458 | args->whichfork = XFS_DATA_FORK; | |
459 | args->trans = tp; | |
460 | ||
461 | if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) { | |
462 | rval = xfs_dir2_sf_removename(args); | |
463 | goto out_free; | |
464 | } | |
465 | ||
466 | rval = xfs_dir2_isblock(args, &v); | |
467 | if (rval) | |
468 | goto out_free; | |
469 | if (v) { | |
470 | rval = xfs_dir2_block_removename(args); | |
471 | goto out_free; | |
472 | } | |
473 | ||
474 | rval = xfs_dir2_isleaf(args, &v); | |
475 | if (rval) | |
476 | goto out_free; | |
477 | if (v) | |
478 | rval = xfs_dir2_leaf_removename(args); | |
2bd0ea18 | 479 | else |
ff105f75 DC |
480 | rval = xfs_dir2_node_removename(args); |
481 | out_free: | |
482 | kmem_free(args); | |
2bd0ea18 NS |
483 | return rval; |
484 | } | |
485 | ||
486 | /* | |
487 | * Replace the inode number of a directory entry. | |
488 | */ | |
5e656dbb BN |
489 | int |
490 | xfs_dir_replace( | |
491 | xfs_trans_t *tp, | |
492 | xfs_inode_t *dp, | |
493 | struct xfs_name *name, /* name of entry to replace */ | |
2bd0ea18 NS |
494 | xfs_ino_t inum, /* new inode number */ |
495 | xfs_fsblock_t *first, /* bmap's firstblock */ | |
dfc130f3 | 496 | xfs_bmap_free_t *flist, /* bmap's freeblock list */ |
2bd0ea18 NS |
497 | xfs_extlen_t total) /* bmap's total block count */ |
498 | { | |
ff105f75 | 499 | struct xfs_da_args *args; |
5e656dbb | 500 | int rval; |
2bd0ea18 NS |
501 | int v; /* type-checking value */ |
502 | ||
a2ceac1f | 503 | ASSERT(S_ISDIR(dp->i_d.di_mode)); |
a95cf252 | 504 | |
ff105f75 DC |
505 | rval = xfs_dir_ino_validate(tp->t_mountp, inum); |
506 | if (rval) | |
2bd0ea18 | 507 | return rval; |
5e656dbb | 508 | |
ff105f75 DC |
509 | args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS); |
510 | if (!args) | |
12b53197 | 511 | return -ENOMEM; |
ff105f75 DC |
512 | |
513 | args->geo = dp->i_mount->m_dir_geo; | |
514 | args->name = name->name; | |
515 | args->namelen = name->len; | |
516 | args->filetype = name->type; | |
517 | args->hashval = dp->i_mount->m_dirnameops->hashname(name); | |
518 | args->inumber = inum; | |
519 | args->dp = dp; | |
520 | args->firstblock = first; | |
521 | args->flist = flist; | |
522 | args->total = total; | |
523 | args->whichfork = XFS_DATA_FORK; | |
524 | args->trans = tp; | |
525 | ||
526 | if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) { | |
527 | rval = xfs_dir2_sf_replace(args); | |
528 | goto out_free; | |
529 | } | |
530 | ||
531 | rval = xfs_dir2_isblock(args, &v); | |
532 | if (rval) | |
533 | goto out_free; | |
534 | if (v) { | |
535 | rval = xfs_dir2_block_replace(args); | |
536 | goto out_free; | |
537 | } | |
538 | ||
539 | rval = xfs_dir2_isleaf(args, &v); | |
540 | if (rval) | |
541 | goto out_free; | |
542 | if (v) | |
543 | rval = xfs_dir2_leaf_replace(args); | |
2bd0ea18 | 544 | else |
ff105f75 DC |
545 | rval = xfs_dir2_node_replace(args); |
546 | out_free: | |
547 | kmem_free(args); | |
2bd0ea18 NS |
548 | return rval; |
549 | } | |
550 | ||
4a34b33d DC |
551 | /* |
552 | * See if this entry can be added to the directory without allocating space. | |
4a34b33d DC |
553 | */ |
554 | int | |
555 | xfs_dir_canenter( | |
556 | xfs_trans_t *tp, | |
557 | xfs_inode_t *dp, | |
5a35bf2c | 558 | struct xfs_name *name) /* name of entry to add */ |
4a34b33d | 559 | { |
5a35bf2c | 560 | return xfs_dir_createname(tp, dp, name, 0, NULL, NULL, 0); |
4a34b33d DC |
561 | } |
562 | ||
2bd0ea18 NS |
563 | /* |
564 | * Utility routines. | |
565 | */ | |
566 | ||
567 | /* | |
568 | * Add a block to the directory. | |
a2ceac1f DC |
569 | * |
570 | * This routine is for data and free blocks, not leaf/node blocks which are | |
571 | * handled by xfs_da_grow_inode. | |
2bd0ea18 | 572 | */ |
5e656dbb | 573 | int |
2bd0ea18 | 574 | xfs_dir2_grow_inode( |
a2ceac1f DC |
575 | struct xfs_da_args *args, |
576 | int space, /* v2 dir's space XFS_DIR2_xxx_SPACE */ | |
577 | xfs_dir2_db_t *dbp) /* out: block number added */ | |
2bd0ea18 | 578 | { |
a2ceac1f DC |
579 | struct xfs_inode *dp = args->dp; |
580 | struct xfs_mount *mp = dp->i_mount; | |
581 | xfs_fileoff_t bno; /* directory offset of new block */ | |
582 | int count; /* count of filesystem blocks */ | |
583 | int error; | |
56b2de80 DC |
584 | |
585 | trace_xfs_dir2_grow_inode(args, space); | |
2bd0ea18 | 586 | |
2bd0ea18 NS |
587 | /* |
588 | * Set lowest possible block in the space requested. | |
589 | */ | |
590 | bno = XFS_B_TO_FSBT(mp, space * XFS_DIR2_SPACE_SIZE); | |
ff105f75 | 591 | count = args->geo->fsbcount; |
2bd0ea18 | 592 | |
a2ceac1f DC |
593 | error = xfs_da_grow_inode_int(args, &bno, count); |
594 | if (error) | |
595 | return error; | |
56b2de80 | 596 | |
ff105f75 | 597 | *dbp = xfs_dir2_da_to_db(args->geo, (xfs_dablk_t)bno); |
56b2de80 | 598 | |
2bd0ea18 NS |
599 | /* |
600 | * Update file's size if this is the data space and it grew. | |
601 | */ | |
602 | if (space == XFS_DIR2_DATA_SPACE) { | |
603 | xfs_fsize_t size; /* directory file (data) size */ | |
604 | ||
605 | size = XFS_FSB_TO_B(mp, bno + count); | |
606 | if (size > dp->i_d.di_size) { | |
607 | dp->i_d.di_size = size; | |
a2ceac1f | 608 | xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE); |
2bd0ea18 NS |
609 | } |
610 | } | |
611 | return 0; | |
612 | } | |
613 | ||
614 | /* | |
615 | * See if the directory is a single-block form directory. | |
616 | */ | |
5e656dbb | 617 | int |
2bd0ea18 | 618 | xfs_dir2_isblock( |
ff105f75 DC |
619 | struct xfs_da_args *args, |
620 | int *vp) /* out: 1 is block, 0 is not block */ | |
2bd0ea18 | 621 | { |
ff105f75 DC |
622 | xfs_fileoff_t last; /* last file offset */ |
623 | int rval; | |
2bd0ea18 | 624 | |
ff105f75 | 625 | if ((rval = xfs_bmap_last_offset(args->dp, &last, XFS_DATA_FORK))) |
2bd0ea18 | 626 | return rval; |
ff105f75 DC |
627 | rval = XFS_FSB_TO_B(args->dp->i_mount, last) == args->geo->blksize; |
628 | ASSERT(rval == 0 || args->dp->i_d.di_size == args->geo->blksize); | |
2bd0ea18 NS |
629 | *vp = rval; |
630 | return 0; | |
631 | } | |
632 | ||
633 | /* | |
634 | * See if the directory is a single-leaf form directory. | |
635 | */ | |
5e656dbb | 636 | int |
2bd0ea18 | 637 | xfs_dir2_isleaf( |
ff105f75 DC |
638 | struct xfs_da_args *args, |
639 | int *vp) /* out: 1 is block, 0 is not block */ | |
2bd0ea18 | 640 | { |
ff105f75 DC |
641 | xfs_fileoff_t last; /* last file offset */ |
642 | int rval; | |
2bd0ea18 | 643 | |
ff105f75 | 644 | if ((rval = xfs_bmap_last_offset(args->dp, &last, XFS_DATA_FORK))) |
2bd0ea18 | 645 | return rval; |
ff105f75 | 646 | *vp = last == args->geo->leafblk + args->geo->fsbcount; |
2bd0ea18 NS |
647 | return 0; |
648 | } | |
649 | ||
650 | /* | |
651 | * Remove the given block from the directory. | |
652 | * This routine is used for data and free blocks, leaf/node are done | |
653 | * by xfs_da_shrink_inode. | |
654 | */ | |
655 | int | |
656 | xfs_dir2_shrink_inode( | |
5e656dbb BN |
657 | xfs_da_args_t *args, |
658 | xfs_dir2_db_t db, | |
a2ceac1f | 659 | struct xfs_buf *bp) |
2bd0ea18 NS |
660 | { |
661 | xfs_fileoff_t bno; /* directory file offset */ | |
662 | xfs_dablk_t da; /* directory file offset */ | |
663 | int done; /* bunmap is finished */ | |
5e656dbb BN |
664 | xfs_inode_t *dp; |
665 | int error; | |
666 | xfs_mount_t *mp; | |
667 | xfs_trans_t *tp; | |
2bd0ea18 | 668 | |
56b2de80 DC |
669 | trace_xfs_dir2_shrink_inode(args, db); |
670 | ||
2bd0ea18 NS |
671 | dp = args->dp; |
672 | mp = dp->i_mount; | |
673 | tp = args->trans; | |
ff105f75 | 674 | da = xfs_dir2_db_to_da(args->geo, db); |
2bd0ea18 NS |
675 | /* |
676 | * Unmap the fsblock(s). | |
677 | */ | |
ff105f75 | 678 | if ((error = xfs_bunmapi(tp, dp, da, args->geo->fsbcount, |
2bd0ea18 | 679 | XFS_BMAPI_METADATA, 0, args->firstblock, args->flist, |
56b2de80 | 680 | &done))) { |
2bd0ea18 NS |
681 | /* |
682 | * ENOSPC actually can happen if we're in a removename with | |
683 | * no space reservation, and the resulting block removal | |
684 | * would cause a bmap btree split or conversion from extents | |
685 | * to btree. This can only happen for un-fragmented | |
686 | * directory blocks, since you need to be punching out | |
687 | * the middle of an extent. | |
688 | * In this case we need to leave the block in the file, | |
689 | * and not binval it. | |
690 | * So the block has to be in a consistent empty state | |
691 | * and appropriately logged. | |
5000d01d | 692 | * We don't free up the buffer, the caller can tell it |
2bd0ea18 NS |
693 | * hasn't happened since it got an error back. |
694 | */ | |
695 | return error; | |
696 | } | |
697 | ASSERT(done); | |
698 | /* | |
699 | * Invalidate the buffer from the transaction. | |
700 | */ | |
a2ceac1f | 701 | xfs_trans_binval(tp, bp); |
2bd0ea18 NS |
702 | /* |
703 | * If it's not a data block, we're done. | |
704 | */ | |
ff105f75 | 705 | if (db >= xfs_dir2_byte_to_db(args->geo, XFS_DIR2_LEAF_OFFSET)) |
2bd0ea18 NS |
706 | return 0; |
707 | /* | |
708 | * If the block isn't the last one in the directory, we're done. | |
709 | */ | |
ff105f75 | 710 | if (dp->i_d.di_size > xfs_dir2_db_off_to_byte(args->geo, db + 1, 0)) |
2bd0ea18 NS |
711 | return 0; |
712 | bno = da; | |
0e266570 | 713 | if ((error = xfs_bmap_last_before(tp, dp, &bno, XFS_DATA_FORK))) { |
2bd0ea18 NS |
714 | /* |
715 | * This can't really happen unless there's kernel corruption. | |
716 | */ | |
717 | return error; | |
718 | } | |
ff105f75 | 719 | if (db == args->geo->datablk) |
2bd0ea18 NS |
720 | ASSERT(bno == 0); |
721 | else | |
722 | ASSERT(bno > 0); | |
723 | /* | |
724 | * Set the size to the new last block. | |
725 | */ | |
726 | dp->i_d.di_size = XFS_FSB_TO_B(mp, bno); | |
727 | xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE); | |
728 | return 0; | |
729 | } |