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34dc7c2f BB |
1 | /* |
2 | * CDDL HEADER START | |
3 | * | |
4 | * The contents of this file are subject to the terms of the | |
5 | * Common Development and Distribution License (the "License"). | |
6 | * You may not use this file except in compliance with the License. | |
7 | * | |
8 | * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE | |
9 | * or http://www.opensolaris.org/os/licensing. | |
10 | * See the License for the specific language governing permissions | |
11 | * and limitations under the License. | |
12 | * | |
13 | * When distributing Covered Code, include this CDDL HEADER in each | |
14 | * file and include the License file at usr/src/OPENSOLARIS.LICENSE. | |
15 | * If applicable, add the following below this CDDL HEADER, with the | |
16 | * fields enclosed by brackets "[]" replaced with your own identifying | |
17 | * information: Portions Copyright [yyyy] [name of copyright owner] | |
18 | * | |
19 | * CDDL HEADER END | |
20 | */ | |
21 | /* | |
428870ff | 22 | * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. |
34dc7c2f BB |
23 | */ |
24 | ||
34dc7c2f BB |
25 | #include <sys/types.h> |
26 | #include <sys/param.h> | |
27 | #include <sys/time.h> | |
28 | #include <sys/systm.h> | |
29 | #include <sys/sysmacros.h> | |
30 | #include <sys/resource.h> | |
31 | #include <sys/vfs.h> | |
32 | #include <sys/vnode.h> | |
33 | #include <sys/file.h> | |
34 | #include <sys/mode.h> | |
35 | #include <sys/kmem.h> | |
36 | #include <sys/uio.h> | |
37 | #include <sys/pathname.h> | |
38 | #include <sys/cmn_err.h> | |
39 | #include <sys/errno.h> | |
40 | #include <sys/stat.h> | |
41 | #include <sys/unistd.h> | |
42 | #include <sys/sunddi.h> | |
43 | #include <sys/random.h> | |
44 | #include <sys/policy.h> | |
45 | #include <sys/zfs_dir.h> | |
46 | #include <sys/zfs_acl.h> | |
47 | #include <sys/fs/zfs.h> | |
48 | #include "fs/fs_subr.h" | |
49 | #include <sys/zap.h> | |
50 | #include <sys/dmu.h> | |
51 | #include <sys/atomic.h> | |
52 | #include <sys/zfs_ctldir.h> | |
53 | #include <sys/zfs_fuid.h> | |
428870ff BB |
54 | #include <sys/sa.h> |
55 | #include <sys/zfs_sa.h> | |
34dc7c2f BB |
56 | #include <sys/dnlc.h> |
57 | #include <sys/extdirent.h> | |
58 | ||
59 | /* | |
60 | * zfs_match_find() is used by zfs_dirent_lock() to peform zap lookups | |
61 | * of names after deciding which is the appropriate lookup interface. | |
62 | */ | |
63 | static int | |
64 | zfs_match_find(zfsvfs_t *zfsvfs, znode_t *dzp, char *name, boolean_t exact, | |
65 | boolean_t update, int *deflags, pathname_t *rpnp, uint64_t *zoid) | |
66 | { | |
67 | int error; | |
68 | ||
69 | if (zfsvfs->z_norm) { | |
70 | matchtype_t mt = MT_FIRST; | |
71 | boolean_t conflict = B_FALSE; | |
72 | size_t bufsz = 0; | |
73 | char *buf = NULL; | |
74 | ||
75 | if (rpnp) { | |
76 | buf = rpnp->pn_buf; | |
77 | bufsz = rpnp->pn_bufsize; | |
78 | } | |
79 | if (exact) | |
80 | mt = MT_EXACT; | |
81 | /* | |
82 | * In the non-mixed case we only expect there would ever | |
83 | * be one match, but we need to use the normalizing lookup. | |
84 | */ | |
85 | error = zap_lookup_norm(zfsvfs->z_os, dzp->z_id, name, 8, 1, | |
86 | zoid, mt, buf, bufsz, &conflict); | |
87 | if (!error && deflags) | |
88 | *deflags = conflict ? ED_CASE_CONFLICT : 0; | |
89 | } else { | |
90 | error = zap_lookup(zfsvfs->z_os, dzp->z_id, name, 8, 1, zoid); | |
91 | } | |
92 | *zoid = ZFS_DIRENT_OBJ(*zoid); | |
93 | ||
94 | if (error == ENOENT && update) | |
95 | dnlc_update(ZTOV(dzp), name, DNLC_NO_VNODE); | |
96 | ||
97 | return (error); | |
98 | } | |
99 | ||
100 | /* | |
101 | * Lock a directory entry. A dirlock on <dzp, name> protects that name | |
102 | * in dzp's directory zap object. As long as you hold a dirlock, you can | |
103 | * assume two things: (1) dzp cannot be reaped, and (2) no other thread | |
104 | * can change the zap entry for (i.e. link or unlink) this name. | |
105 | * | |
106 | * Input arguments: | |
107 | * dzp - znode for directory | |
108 | * name - name of entry to lock | |
109 | * flag - ZNEW: if the entry already exists, fail with EEXIST. | |
110 | * ZEXISTS: if the entry does not exist, fail with ENOENT. | |
111 | * ZSHARED: allow concurrent access with other ZSHARED callers. | |
112 | * ZXATTR: we want dzp's xattr directory | |
113 | * ZCILOOK: On a mixed sensitivity file system, | |
114 | * this lookup should be case-insensitive. | |
115 | * ZCIEXACT: On a purely case-insensitive file system, | |
116 | * this lookup should be case-sensitive. | |
117 | * ZRENAMING: we are locking for renaming, force narrow locks | |
428870ff BB |
118 | * ZHAVELOCK: Don't grab the z_name_lock for this call. The |
119 | * current thread already holds it. | |
34dc7c2f BB |
120 | * |
121 | * Output arguments: | |
122 | * zpp - pointer to the znode for the entry (NULL if there isn't one) | |
123 | * dlpp - pointer to the dirlock for this entry (NULL on error) | |
124 | * direntflags - (case-insensitive lookup only) | |
125 | * flags if multiple case-sensitive matches exist in directory | |
126 | * realpnp - (case-insensitive lookup only) | |
127 | * actual name matched within the directory | |
128 | * | |
129 | * Return value: 0 on success or errno on failure. | |
130 | * | |
131 | * NOTE: Always checks for, and rejects, '.' and '..'. | |
132 | * NOTE: For case-insensitive file systems we take wide locks (see below), | |
133 | * but return znode pointers to a single match. | |
134 | */ | |
135 | int | |
136 | zfs_dirent_lock(zfs_dirlock_t **dlpp, znode_t *dzp, char *name, znode_t **zpp, | |
137 | int flag, int *direntflags, pathname_t *realpnp) | |
138 | { | |
139 | zfsvfs_t *zfsvfs = dzp->z_zfsvfs; | |
140 | zfs_dirlock_t *dl; | |
141 | boolean_t update; | |
142 | boolean_t exact; | |
143 | uint64_t zoid; | |
144 | vnode_t *vp = NULL; | |
145 | int error = 0; | |
146 | int cmpflags; | |
147 | ||
148 | *zpp = NULL; | |
149 | *dlpp = NULL; | |
150 | ||
151 | /* | |
152 | * Verify that we are not trying to lock '.', '..', or '.zfs' | |
153 | */ | |
154 | if (name[0] == '.' && | |
155 | (name[1] == '\0' || (name[1] == '.' && name[2] == '\0')) || | |
156 | zfs_has_ctldir(dzp) && strcmp(name, ZFS_CTLDIR_NAME) == 0) | |
157 | return (EEXIST); | |
158 | ||
159 | /* | |
160 | * Case sensitivity and normalization preferences are set when | |
161 | * the file system is created. These are stored in the | |
162 | * zfsvfs->z_case and zfsvfs->z_norm fields. These choices | |
163 | * affect what vnodes can be cached in the DNLC, how we | |
164 | * perform zap lookups, and the "width" of our dirlocks. | |
165 | * | |
166 | * A normal dirlock locks a single name. Note that with | |
167 | * normalization a name can be composed multiple ways, but | |
168 | * when normalized, these names all compare equal. A wide | |
169 | * dirlock locks multiple names. We need these when the file | |
170 | * system is supporting mixed-mode access. It is sometimes | |
171 | * necessary to lock all case permutations of file name at | |
172 | * once so that simultaneous case-insensitive/case-sensitive | |
173 | * behaves as rationally as possible. | |
174 | */ | |
175 | ||
176 | /* | |
177 | * Decide if exact matches should be requested when performing | |
178 | * a zap lookup on file systems supporting case-insensitive | |
179 | * access. | |
180 | */ | |
181 | exact = | |
182 | ((zfsvfs->z_case == ZFS_CASE_INSENSITIVE) && (flag & ZCIEXACT)) || | |
183 | ((zfsvfs->z_case == ZFS_CASE_MIXED) && !(flag & ZCILOOK)); | |
184 | ||
185 | /* | |
186 | * Only look in or update the DNLC if we are looking for the | |
187 | * name on a file system that does not require normalization | |
188 | * or case folding. We can also look there if we happen to be | |
189 | * on a non-normalizing, mixed sensitivity file system IF we | |
190 | * are looking for the exact name. | |
191 | * | |
192 | * Maybe can add TO-UPPERed version of name to dnlc in ci-only | |
193 | * case for performance improvement? | |
194 | */ | |
195 | update = !zfsvfs->z_norm || | |
196 | ((zfsvfs->z_case == ZFS_CASE_MIXED) && | |
197 | !(zfsvfs->z_norm & ~U8_TEXTPREP_TOUPPER) && !(flag & ZCILOOK)); | |
198 | ||
199 | /* | |
200 | * ZRENAMING indicates we are in a situation where we should | |
201 | * take narrow locks regardless of the file system's | |
202 | * preferences for normalizing and case folding. This will | |
203 | * prevent us deadlocking trying to grab the same wide lock | |
204 | * twice if the two names happen to be case-insensitive | |
205 | * matches. | |
206 | */ | |
207 | if (flag & ZRENAMING) | |
208 | cmpflags = 0; | |
209 | else | |
210 | cmpflags = zfsvfs->z_norm; | |
211 | ||
212 | /* | |
213 | * Wait until there are no locks on this name. | |
428870ff BB |
214 | * |
215 | * Don't grab the the lock if it is already held. However, cannot | |
216 | * have both ZSHARED and ZHAVELOCK together. | |
34dc7c2f | 217 | */ |
428870ff BB |
218 | ASSERT(!(flag & ZSHARED) || !(flag & ZHAVELOCK)); |
219 | if (!(flag & ZHAVELOCK)) | |
220 | rw_enter(&dzp->z_name_lock, RW_READER); | |
221 | ||
34dc7c2f BB |
222 | mutex_enter(&dzp->z_lock); |
223 | for (;;) { | |
224 | if (dzp->z_unlinked) { | |
225 | mutex_exit(&dzp->z_lock); | |
428870ff BB |
226 | if (!(flag & ZHAVELOCK)) |
227 | rw_exit(&dzp->z_name_lock); | |
34dc7c2f BB |
228 | return (ENOENT); |
229 | } | |
230 | for (dl = dzp->z_dirlocks; dl != NULL; dl = dl->dl_next) { | |
231 | if ((u8_strcmp(name, dl->dl_name, 0, cmpflags, | |
232 | U8_UNICODE_LATEST, &error) == 0) || error != 0) | |
233 | break; | |
234 | } | |
235 | if (error != 0) { | |
236 | mutex_exit(&dzp->z_lock); | |
428870ff BB |
237 | if (!(flag & ZHAVELOCK)) |
238 | rw_exit(&dzp->z_name_lock); | |
34dc7c2f BB |
239 | return (ENOENT); |
240 | } | |
241 | if (dl == NULL) { | |
242 | /* | |
243 | * Allocate a new dirlock and add it to the list. | |
244 | */ | |
245 | dl = kmem_alloc(sizeof (zfs_dirlock_t), KM_SLEEP); | |
246 | cv_init(&dl->dl_cv, NULL, CV_DEFAULT, NULL); | |
247 | dl->dl_name = name; | |
248 | dl->dl_sharecnt = 0; | |
428870ff | 249 | dl->dl_namelock = 0; |
34dc7c2f BB |
250 | dl->dl_namesize = 0; |
251 | dl->dl_dzp = dzp; | |
252 | dl->dl_next = dzp->z_dirlocks; | |
253 | dzp->z_dirlocks = dl; | |
254 | break; | |
255 | } | |
256 | if ((flag & ZSHARED) && dl->dl_sharecnt != 0) | |
257 | break; | |
258 | cv_wait(&dl->dl_cv, &dzp->z_lock); | |
259 | } | |
260 | ||
428870ff BB |
261 | /* |
262 | * If the z_name_lock was NOT held for this dirlock record it. | |
263 | */ | |
264 | if (flag & ZHAVELOCK) | |
265 | dl->dl_namelock = 1; | |
266 | ||
34dc7c2f BB |
267 | if ((flag & ZSHARED) && ++dl->dl_sharecnt > 1 && dl->dl_namesize == 0) { |
268 | /* | |
269 | * We're the second shared reference to dl. Make a copy of | |
270 | * dl_name in case the first thread goes away before we do. | |
271 | * Note that we initialize the new name before storing its | |
272 | * pointer into dl_name, because the first thread may load | |
273 | * dl->dl_name at any time. He'll either see the old value, | |
274 | * which is his, or the new shared copy; either is OK. | |
275 | */ | |
276 | dl->dl_namesize = strlen(dl->dl_name) + 1; | |
277 | name = kmem_alloc(dl->dl_namesize, KM_SLEEP); | |
278 | bcopy(dl->dl_name, name, dl->dl_namesize); | |
279 | dl->dl_name = name; | |
280 | } | |
281 | ||
282 | mutex_exit(&dzp->z_lock); | |
283 | ||
284 | /* | |
285 | * We have a dirlock on the name. (Note that it is the dirlock, | |
286 | * not the dzp's z_lock, that protects the name in the zap object.) | |
287 | * See if there's an object by this name; if so, put a hold on it. | |
288 | */ | |
289 | if (flag & ZXATTR) { | |
428870ff BB |
290 | error = sa_lookup(dzp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs), &zoid, |
291 | sizeof (zoid)); | |
292 | if (error == 0) | |
293 | error = (zoid == 0 ? ENOENT : 0); | |
34dc7c2f BB |
294 | } else { |
295 | if (update) | |
296 | vp = dnlc_lookup(ZTOV(dzp), name); | |
297 | if (vp == DNLC_NO_VNODE) { | |
298 | VN_RELE(vp); | |
299 | error = ENOENT; | |
300 | } else if (vp) { | |
301 | if (flag & ZNEW) { | |
302 | zfs_dirent_unlock(dl); | |
303 | VN_RELE(vp); | |
304 | return (EEXIST); | |
305 | } | |
306 | *dlpp = dl; | |
307 | *zpp = VTOZ(vp); | |
308 | return (0); | |
309 | } else { | |
310 | error = zfs_match_find(zfsvfs, dzp, name, exact, | |
311 | update, direntflags, realpnp, &zoid); | |
312 | } | |
313 | } | |
314 | if (error) { | |
315 | if (error != ENOENT || (flag & ZEXISTS)) { | |
316 | zfs_dirent_unlock(dl); | |
317 | return (error); | |
318 | } | |
319 | } else { | |
320 | if (flag & ZNEW) { | |
321 | zfs_dirent_unlock(dl); | |
322 | return (EEXIST); | |
323 | } | |
324 | error = zfs_zget(zfsvfs, zoid, zpp); | |
325 | if (error) { | |
326 | zfs_dirent_unlock(dl); | |
327 | return (error); | |
328 | } | |
329 | if (!(flag & ZXATTR) && update) | |
330 | dnlc_update(ZTOV(dzp), name, ZTOV(*zpp)); | |
331 | } | |
332 | ||
333 | *dlpp = dl; | |
334 | ||
335 | return (0); | |
336 | } | |
337 | ||
338 | /* | |
339 | * Unlock this directory entry and wake anyone who was waiting for it. | |
340 | */ | |
341 | void | |
342 | zfs_dirent_unlock(zfs_dirlock_t *dl) | |
343 | { | |
344 | znode_t *dzp = dl->dl_dzp; | |
345 | zfs_dirlock_t **prev_dl, *cur_dl; | |
346 | ||
347 | mutex_enter(&dzp->z_lock); | |
428870ff BB |
348 | |
349 | if (!dl->dl_namelock) | |
350 | rw_exit(&dzp->z_name_lock); | |
351 | ||
34dc7c2f BB |
352 | if (dl->dl_sharecnt > 1) { |
353 | dl->dl_sharecnt--; | |
354 | mutex_exit(&dzp->z_lock); | |
355 | return; | |
356 | } | |
357 | prev_dl = &dzp->z_dirlocks; | |
358 | while ((cur_dl = *prev_dl) != dl) | |
359 | prev_dl = &cur_dl->dl_next; | |
360 | *prev_dl = dl->dl_next; | |
361 | cv_broadcast(&dl->dl_cv); | |
362 | mutex_exit(&dzp->z_lock); | |
363 | ||
364 | if (dl->dl_namesize != 0) | |
365 | kmem_free(dl->dl_name, dl->dl_namesize); | |
366 | cv_destroy(&dl->dl_cv); | |
367 | kmem_free(dl, sizeof (*dl)); | |
368 | } | |
369 | ||
370 | /* | |
371 | * Look up an entry in a directory. | |
372 | * | |
373 | * NOTE: '.' and '..' are handled as special cases because | |
374 | * no directory entries are actually stored for them. If this is | |
375 | * the root of a filesystem, then '.zfs' is also treated as a | |
376 | * special pseudo-directory. | |
377 | */ | |
378 | int | |
379 | zfs_dirlook(znode_t *dzp, char *name, vnode_t **vpp, int flags, | |
380 | int *deflg, pathname_t *rpnp) | |
381 | { | |
382 | zfs_dirlock_t *dl; | |
383 | znode_t *zp; | |
384 | int error = 0; | |
428870ff | 385 | uint64_t parent; |
34dc7c2f BB |
386 | |
387 | if (name[0] == 0 || (name[0] == '.' && name[1] == 0)) { | |
388 | *vpp = ZTOV(dzp); | |
389 | VN_HOLD(*vpp); | |
390 | } else if (name[0] == '.' && name[1] == '.' && name[2] == 0) { | |
391 | zfsvfs_t *zfsvfs = dzp->z_zfsvfs; | |
428870ff | 392 | |
34dc7c2f BB |
393 | /* |
394 | * If we are a snapshot mounted under .zfs, return | |
395 | * the vp for the snapshot directory. | |
396 | */ | |
428870ff BB |
397 | if ((error = sa_lookup(dzp->z_sa_hdl, |
398 | SA_ZPL_PARENT(zfsvfs), &parent, sizeof (parent))) != 0) | |
399 | return (error); | |
400 | if (parent == dzp->z_id && zfsvfs->z_parent != zfsvfs) { | |
34dc7c2f BB |
401 | error = zfsctl_root_lookup(zfsvfs->z_parent->z_ctldir, |
402 | "snapshot", vpp, NULL, 0, NULL, kcred, | |
403 | NULL, NULL, NULL); | |
404 | return (error); | |
405 | } | |
406 | rw_enter(&dzp->z_parent_lock, RW_READER); | |
428870ff | 407 | error = zfs_zget(zfsvfs, parent, &zp); |
34dc7c2f BB |
408 | if (error == 0) |
409 | *vpp = ZTOV(zp); | |
410 | rw_exit(&dzp->z_parent_lock); | |
411 | } else if (zfs_has_ctldir(dzp) && strcmp(name, ZFS_CTLDIR_NAME) == 0) { | |
412 | *vpp = zfsctl_root(dzp); | |
413 | } else { | |
414 | int zf; | |
415 | ||
416 | zf = ZEXISTS | ZSHARED; | |
417 | if (flags & FIGNORECASE) | |
418 | zf |= ZCILOOK; | |
419 | ||
420 | error = zfs_dirent_lock(&dl, dzp, name, &zp, zf, deflg, rpnp); | |
421 | if (error == 0) { | |
422 | *vpp = ZTOV(zp); | |
423 | zfs_dirent_unlock(dl); | |
424 | dzp->z_zn_prefetch = B_TRUE; /* enable prefetching */ | |
425 | } | |
426 | rpnp = NULL; | |
427 | } | |
428 | ||
429 | if ((flags & FIGNORECASE) && rpnp && !error) | |
430 | (void) strlcpy(rpnp->pn_buf, name, rpnp->pn_bufsize); | |
431 | ||
432 | return (error); | |
433 | } | |
434 | ||
34dc7c2f BB |
435 | /* |
436 | * unlinked Set (formerly known as the "delete queue") Error Handling | |
437 | * | |
438 | * When dealing with the unlinked set, we dmu_tx_hold_zap(), but we | |
439 | * don't specify the name of the entry that we will be manipulating. We | |
440 | * also fib and say that we won't be adding any new entries to the | |
441 | * unlinked set, even though we might (this is to lower the minimum file | |
442 | * size that can be deleted in a full filesystem). So on the small | |
443 | * chance that the nlink list is using a fat zap (ie. has more than | |
444 | * 2000 entries), we *may* not pre-read a block that's needed. | |
445 | * Therefore it is remotely possible for some of the assertions | |
446 | * regarding the unlinked set below to fail due to i/o error. On a | |
447 | * nondebug system, this will result in the space being leaked. | |
448 | */ | |
449 | void | |
450 | zfs_unlinked_add(znode_t *zp, dmu_tx_t *tx) | |
451 | { | |
452 | zfsvfs_t *zfsvfs = zp->z_zfsvfs; | |
34dc7c2f BB |
453 | |
454 | ASSERT(zp->z_unlinked); | |
428870ff | 455 | ASSERT(zp->z_links == 0); |
34dc7c2f | 456 | |
b128c09f BB |
457 | VERIFY3U(0, ==, |
458 | zap_add_int(zfsvfs->z_os, zfsvfs->z_unlinkedobj, zp->z_id, tx)); | |
34dc7c2f BB |
459 | } |
460 | ||
461 | /* | |
462 | * Clean up any znodes that had no links when we either crashed or | |
463 | * (force) umounted the file system. | |
464 | */ | |
465 | void | |
466 | zfs_unlinked_drain(zfsvfs_t *zfsvfs) | |
467 | { | |
468 | zap_cursor_t zc; | |
469 | zap_attribute_t zap; | |
470 | dmu_object_info_t doi; | |
471 | znode_t *zp; | |
472 | int error; | |
473 | ||
474 | /* | |
475 | * Interate over the contents of the unlinked set. | |
476 | */ | |
477 | for (zap_cursor_init(&zc, zfsvfs->z_os, zfsvfs->z_unlinkedobj); | |
478 | zap_cursor_retrieve(&zc, &zap) == 0; | |
479 | zap_cursor_advance(&zc)) { | |
480 | ||
481 | /* | |
482 | * See what kind of object we have in list | |
483 | */ | |
484 | ||
485 | error = dmu_object_info(zfsvfs->z_os, | |
486 | zap.za_first_integer, &doi); | |
487 | if (error != 0) | |
488 | continue; | |
489 | ||
490 | ASSERT((doi.doi_type == DMU_OT_PLAIN_FILE_CONTENTS) || | |
491 | (doi.doi_type == DMU_OT_DIRECTORY_CONTENTS)); | |
492 | /* | |
493 | * We need to re-mark these list entries for deletion, | |
494 | * so we pull them back into core and set zp->z_unlinked. | |
495 | */ | |
496 | error = zfs_zget(zfsvfs, zap.za_first_integer, &zp); | |
497 | ||
498 | /* | |
499 | * We may pick up znodes that are already marked for deletion. | |
500 | * This could happen during the purge of an extended attribute | |
501 | * directory. All we need to do is skip over them, since they | |
502 | * are already in the system marked z_unlinked. | |
503 | */ | |
504 | if (error != 0) | |
505 | continue; | |
506 | ||
507 | zp->z_unlinked = B_TRUE; | |
508 | VN_RELE(ZTOV(zp)); | |
509 | } | |
510 | zap_cursor_fini(&zc); | |
511 | } | |
512 | ||
513 | /* | |
514 | * Delete the entire contents of a directory. Return a count | |
515 | * of the number of entries that could not be deleted. If we encounter | |
516 | * an error, return a count of at least one so that the directory stays | |
517 | * in the unlinked set. | |
518 | * | |
519 | * NOTE: this function assumes that the directory is inactive, | |
520 | * so there is no need to lock its entries before deletion. | |
521 | * Also, it assumes the directory contents is *only* regular | |
522 | * files. | |
523 | */ | |
524 | static int | |
525 | zfs_purgedir(znode_t *dzp) | |
526 | { | |
527 | zap_cursor_t zc; | |
528 | zap_attribute_t zap; | |
529 | znode_t *xzp; | |
530 | dmu_tx_t *tx; | |
531 | zfsvfs_t *zfsvfs = dzp->z_zfsvfs; | |
532 | zfs_dirlock_t dl; | |
533 | int skipped = 0; | |
534 | int error; | |
535 | ||
536 | for (zap_cursor_init(&zc, zfsvfs->z_os, dzp->z_id); | |
537 | (error = zap_cursor_retrieve(&zc, &zap)) == 0; | |
538 | zap_cursor_advance(&zc)) { | |
539 | error = zfs_zget(zfsvfs, | |
540 | ZFS_DIRENT_OBJ(zap.za_first_integer), &xzp); | |
541 | if (error) { | |
542 | skipped += 1; | |
543 | continue; | |
544 | } | |
545 | ||
546 | ASSERT((ZTOV(xzp)->v_type == VREG) || | |
547 | (ZTOV(xzp)->v_type == VLNK)); | |
548 | ||
549 | tx = dmu_tx_create(zfsvfs->z_os); | |
428870ff | 550 | dmu_tx_hold_sa(tx, dzp->z_sa_hdl, B_FALSE); |
34dc7c2f | 551 | dmu_tx_hold_zap(tx, dzp->z_id, FALSE, zap.za_name); |
428870ff | 552 | dmu_tx_hold_sa(tx, xzp->z_sa_hdl, B_FALSE); |
34dc7c2f | 553 | dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL); |
428870ff BB |
554 | /* Is this really needed ? */ |
555 | zfs_sa_upgrade_txholds(tx, xzp); | |
34dc7c2f BB |
556 | error = dmu_tx_assign(tx, TXG_WAIT); |
557 | if (error) { | |
558 | dmu_tx_abort(tx); | |
559 | VN_RELE(ZTOV(xzp)); | |
560 | skipped += 1; | |
561 | continue; | |
562 | } | |
563 | bzero(&dl, sizeof (dl)); | |
564 | dl.dl_dzp = dzp; | |
565 | dl.dl_name = zap.za_name; | |
566 | ||
567 | error = zfs_link_destroy(&dl, xzp, tx, 0, NULL); | |
568 | if (error) | |
569 | skipped += 1; | |
570 | dmu_tx_commit(tx); | |
571 | ||
572 | VN_RELE(ZTOV(xzp)); | |
573 | } | |
574 | zap_cursor_fini(&zc); | |
575 | if (error != ENOENT) | |
576 | skipped += 1; | |
577 | return (skipped); | |
578 | } | |
579 | ||
580 | void | |
581 | zfs_rmnode(znode_t *zp) | |
582 | { | |
583 | zfsvfs_t *zfsvfs = zp->z_zfsvfs; | |
584 | objset_t *os = zfsvfs->z_os; | |
585 | znode_t *xzp = NULL; | |
34dc7c2f BB |
586 | dmu_tx_t *tx; |
587 | uint64_t acl_obj; | |
428870ff | 588 | uint64_t xattr_obj; |
34dc7c2f BB |
589 | int error; |
590 | ||
428870ff | 591 | ASSERT(zp->z_links == 0); |
34dc7c2f | 592 | ASSERT(ZTOV(zp)->v_count == 0); |
34dc7c2f BB |
593 | |
594 | /* | |
595 | * If this is an attribute directory, purge its contents. | |
596 | */ | |
428870ff | 597 | if (ZTOV(zp)->v_type == VDIR && (zp->z_pflags & ZFS_XATTR)) { |
34dc7c2f BB |
598 | if (zfs_purgedir(zp) != 0) { |
599 | /* | |
600 | * Not enough space to delete some xattrs. | |
b128c09f | 601 | * Leave it in the unlinked set. |
34dc7c2f BB |
602 | */ |
603 | zfs_znode_dmu_fini(zp); | |
604 | zfs_znode_free(zp); | |
605 | return; | |
606 | } | |
607 | } | |
608 | ||
b128c09f BB |
609 | /* |
610 | * Free up all the data in the file. | |
611 | */ | |
612 | error = dmu_free_long_range(os, zp->z_id, 0, DMU_OBJECT_END); | |
613 | if (error) { | |
614 | /* | |
615 | * Not enough space. Leave the file in the unlinked set. | |
616 | */ | |
617 | zfs_znode_dmu_fini(zp); | |
618 | zfs_znode_free(zp); | |
619 | return; | |
620 | } | |
621 | ||
34dc7c2f BB |
622 | /* |
623 | * If the file has extended attributes, we're going to unlink | |
624 | * the xattr dir. | |
625 | */ | |
428870ff BB |
626 | error = sa_lookup(zp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs), |
627 | &xattr_obj, sizeof (xattr_obj)); | |
628 | if (error == 0 && xattr_obj) { | |
629 | error = zfs_zget(zfsvfs, xattr_obj, &xzp); | |
34dc7c2f BB |
630 | ASSERT(error == 0); |
631 | } | |
632 | ||
572e2857 | 633 | acl_obj = zfs_external_acl(zp); |
34dc7c2f BB |
634 | |
635 | /* | |
b128c09f | 636 | * Set up the final transaction. |
34dc7c2f BB |
637 | */ |
638 | tx = dmu_tx_create(os); | |
639 | dmu_tx_hold_free(tx, zp->z_id, 0, DMU_OBJECT_END); | |
640 | dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL); | |
641 | if (xzp) { | |
34dc7c2f | 642 | dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, TRUE, NULL); |
428870ff | 643 | dmu_tx_hold_sa(tx, xzp->z_sa_hdl, B_FALSE); |
34dc7c2f BB |
644 | } |
645 | if (acl_obj) | |
646 | dmu_tx_hold_free(tx, acl_obj, 0, DMU_OBJECT_END); | |
428870ff BB |
647 | |
648 | zfs_sa_upgrade_txholds(tx, zp); | |
34dc7c2f BB |
649 | error = dmu_tx_assign(tx, TXG_WAIT); |
650 | if (error) { | |
651 | /* | |
652 | * Not enough space to delete the file. Leave it in the | |
653 | * unlinked set, leaking it until the fs is remounted (at | |
654 | * which point we'll call zfs_unlinked_drain() to process it). | |
655 | */ | |
656 | dmu_tx_abort(tx); | |
657 | zfs_znode_dmu_fini(zp); | |
658 | zfs_znode_free(zp); | |
659 | goto out; | |
660 | } | |
661 | ||
662 | if (xzp) { | |
428870ff | 663 | ASSERT(error == 0); |
34dc7c2f BB |
664 | mutex_enter(&xzp->z_lock); |
665 | xzp->z_unlinked = B_TRUE; /* mark xzp for deletion */ | |
428870ff BB |
666 | xzp->z_links = 0; /* no more links to it */ |
667 | VERIFY(0 == sa_update(xzp->z_sa_hdl, SA_ZPL_LINKS(zfsvfs), | |
668 | &xzp->z_links, sizeof (xzp->z_links), tx)); | |
34dc7c2f BB |
669 | mutex_exit(&xzp->z_lock); |
670 | zfs_unlinked_add(xzp, tx); | |
671 | } | |
672 | ||
673 | /* Remove this znode from the unlinked set */ | |
b128c09f BB |
674 | VERIFY3U(0, ==, |
675 | zap_remove_int(zfsvfs->z_os, zfsvfs->z_unlinkedobj, zp->z_id, tx)); | |
34dc7c2f BB |
676 | |
677 | zfs_znode_delete(zp, tx); | |
678 | ||
679 | dmu_tx_commit(tx); | |
680 | out: | |
681 | if (xzp) | |
682 | VN_RELE(ZTOV(xzp)); | |
683 | } | |
684 | ||
685 | static uint64_t | |
428870ff | 686 | zfs_dirent(znode_t *zp, uint64_t mode) |
34dc7c2f BB |
687 | { |
688 | uint64_t de = zp->z_id; | |
428870ff | 689 | |
34dc7c2f | 690 | if (zp->z_zfsvfs->z_version >= ZPL_VERSION_DIRENT_TYPE) |
428870ff | 691 | de |= IFTODT(mode) << 60; |
34dc7c2f BB |
692 | return (de); |
693 | } | |
694 | ||
695 | /* | |
696 | * Link zp into dl. Can only fail if zp has been unlinked. | |
697 | */ | |
698 | int | |
699 | zfs_link_create(zfs_dirlock_t *dl, znode_t *zp, dmu_tx_t *tx, int flag) | |
700 | { | |
701 | znode_t *dzp = dl->dl_dzp; | |
428870ff | 702 | zfsvfs_t *zfsvfs = zp->z_zfsvfs; |
34dc7c2f BB |
703 | vnode_t *vp = ZTOV(zp); |
704 | uint64_t value; | |
705 | int zp_is_dir = (vp->v_type == VDIR); | |
428870ff BB |
706 | sa_bulk_attr_t bulk[5]; |
707 | uint64_t mtime[2], ctime[2]; | |
708 | int count = 0; | |
34dc7c2f BB |
709 | int error; |
710 | ||
34dc7c2f BB |
711 | mutex_enter(&zp->z_lock); |
712 | ||
713 | if (!(flag & ZRENAMING)) { | |
714 | if (zp->z_unlinked) { /* no new links to unlinked zp */ | |
715 | ASSERT(!(flag & (ZNEW | ZEXISTS))); | |
716 | mutex_exit(&zp->z_lock); | |
717 | return (ENOENT); | |
718 | } | |
428870ff BB |
719 | zp->z_links++; |
720 | SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), NULL, | |
721 | &zp->z_links, sizeof (zp->z_links)); | |
722 | ||
34dc7c2f | 723 | } |
428870ff BB |
724 | SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_PARENT(zfsvfs), NULL, |
725 | &dzp->z_id, sizeof (dzp->z_id)); | |
726 | SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL, | |
727 | &zp->z_pflags, sizeof (zp->z_pflags)); | |
728 | ||
729 | if (!(flag & ZNEW)) { | |
730 | SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, | |
731 | ctime, sizeof (ctime)); | |
732 | zfs_tstamp_update_setup(zp, STATE_CHANGED, mtime, | |
733 | ctime, B_TRUE); | |
734 | } | |
735 | error = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx); | |
736 | ASSERT(error == 0); | |
34dc7c2f | 737 | |
34dc7c2f BB |
738 | mutex_exit(&zp->z_lock); |
739 | ||
34dc7c2f | 740 | mutex_enter(&dzp->z_lock); |
428870ff BB |
741 | dzp->z_size++; |
742 | dzp->z_links += zp_is_dir; | |
743 | count = 0; | |
744 | SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), NULL, | |
745 | &dzp->z_size, sizeof (dzp->z_size)); | |
746 | SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), NULL, | |
747 | &dzp->z_links, sizeof (dzp->z_links)); | |
748 | SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, | |
749 | mtime, sizeof (mtime)); | |
750 | SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, | |
751 | ctime, sizeof (ctime)); | |
752 | SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL, | |
753 | &dzp->z_pflags, sizeof (dzp->z_pflags)); | |
754 | zfs_tstamp_update_setup(dzp, CONTENT_MODIFIED, mtime, ctime, B_TRUE); | |
755 | error = sa_bulk_update(dzp->z_sa_hdl, bulk, count, tx); | |
756 | ASSERT(error == 0); | |
34dc7c2f BB |
757 | mutex_exit(&dzp->z_lock); |
758 | ||
428870ff | 759 | value = zfs_dirent(zp, zp->z_mode); |
34dc7c2f BB |
760 | error = zap_add(zp->z_zfsvfs->z_os, dzp->z_id, dl->dl_name, |
761 | 8, 1, &value, tx); | |
762 | ASSERT(error == 0); | |
763 | ||
764 | dnlc_update(ZTOV(dzp), dl->dl_name, vp); | |
765 | ||
766 | return (0); | |
767 | } | |
768 | ||
428870ff BB |
769 | static int |
770 | zfs_dropname(zfs_dirlock_t *dl, znode_t *zp, znode_t *dzp, dmu_tx_t *tx, | |
771 | int flag) | |
772 | { | |
773 | int error; | |
774 | ||
775 | if (zp->z_zfsvfs->z_norm) { | |
776 | if (((zp->z_zfsvfs->z_case == ZFS_CASE_INSENSITIVE) && | |
777 | (flag & ZCIEXACT)) || | |
778 | ((zp->z_zfsvfs->z_case == ZFS_CASE_MIXED) && | |
779 | !(flag & ZCILOOK))) | |
780 | error = zap_remove_norm(zp->z_zfsvfs->z_os, | |
781 | dzp->z_id, dl->dl_name, MT_EXACT, tx); | |
782 | else | |
783 | error = zap_remove_norm(zp->z_zfsvfs->z_os, | |
784 | dzp->z_id, dl->dl_name, MT_FIRST, tx); | |
785 | } else { | |
786 | error = zap_remove(zp->z_zfsvfs->z_os, | |
787 | dzp->z_id, dl->dl_name, tx); | |
788 | } | |
789 | ||
790 | return (error); | |
791 | } | |
792 | ||
34dc7c2f BB |
793 | /* |
794 | * Unlink zp from dl, and mark zp for deletion if this was the last link. | |
795 | * Can fail if zp is a mount point (EBUSY) or a non-empty directory (EEXIST). | |
796 | * If 'unlinkedp' is NULL, we put unlinked znodes on the unlinked list. | |
797 | * If it's non-NULL, we use it to indicate whether the znode needs deletion, | |
798 | * and it's the caller's job to do it. | |
799 | */ | |
800 | int | |
801 | zfs_link_destroy(zfs_dirlock_t *dl, znode_t *zp, dmu_tx_t *tx, int flag, | |
802 | boolean_t *unlinkedp) | |
803 | { | |
804 | znode_t *dzp = dl->dl_dzp; | |
428870ff | 805 | zfsvfs_t *zfsvfs = dzp->z_zfsvfs; |
34dc7c2f BB |
806 | vnode_t *vp = ZTOV(zp); |
807 | int zp_is_dir = (vp->v_type == VDIR); | |
808 | boolean_t unlinked = B_FALSE; | |
428870ff BB |
809 | sa_bulk_attr_t bulk[5]; |
810 | uint64_t mtime[2], ctime[2]; | |
811 | int count = 0; | |
34dc7c2f BB |
812 | int error; |
813 | ||
814 | dnlc_remove(ZTOV(dzp), dl->dl_name); | |
815 | ||
816 | if (!(flag & ZRENAMING)) { | |
34dc7c2f BB |
817 | if (vn_vfswlock(vp)) /* prevent new mounts on zp */ |
818 | return (EBUSY); | |
819 | ||
820 | if (vn_ismntpt(vp)) { /* don't remove mount point */ | |
821 | vn_vfsunlock(vp); | |
822 | return (EBUSY); | |
823 | } | |
824 | ||
825 | mutex_enter(&zp->z_lock); | |
428870ff BB |
826 | |
827 | if (zp_is_dir && !zfs_dirempty(zp)) { | |
34dc7c2f BB |
828 | mutex_exit(&zp->z_lock); |
829 | vn_vfsunlock(vp); | |
830 | return (EEXIST); | |
831 | } | |
428870ff BB |
832 | |
833 | /* | |
834 | * If we get here, we are going to try to remove the object. | |
835 | * First try removing the name from the directory; if that | |
836 | * fails, return the error. | |
837 | */ | |
838 | error = zfs_dropname(dl, zp, dzp, tx, flag); | |
839 | if (error != 0) { | |
840 | mutex_exit(&zp->z_lock); | |
841 | vn_vfsunlock(vp); | |
842 | return (error); | |
843 | } | |
844 | ||
845 | if (zp->z_links <= zp_is_dir) { | |
34dc7c2f BB |
846 | zfs_panic_recover("zfs: link count on %s is %u, " |
847 | "should be at least %u", | |
848 | zp->z_vnode->v_path ? zp->z_vnode->v_path : | |
428870ff | 849 | "<unknown>", (int)zp->z_links, |
34dc7c2f | 850 | zp_is_dir + 1); |
428870ff | 851 | zp->z_links = zp_is_dir + 1; |
34dc7c2f | 852 | } |
428870ff | 853 | if (--zp->z_links == zp_is_dir) { |
34dc7c2f | 854 | zp->z_unlinked = B_TRUE; |
428870ff | 855 | zp->z_links = 0; |
34dc7c2f BB |
856 | unlinked = B_TRUE; |
857 | } else { | |
428870ff BB |
858 | SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), |
859 | NULL, &ctime, sizeof (ctime)); | |
860 | SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), | |
861 | NULL, &zp->z_pflags, sizeof (zp->z_pflags)); | |
862 | zfs_tstamp_update_setup(zp, STATE_CHANGED, mtime, ctime, | |
863 | B_TRUE); | |
34dc7c2f | 864 | } |
428870ff BB |
865 | SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), |
866 | NULL, &zp->z_links, sizeof (zp->z_links)); | |
867 | error = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx); | |
868 | count = 0; | |
869 | ASSERT(error == 0); | |
34dc7c2f BB |
870 | mutex_exit(&zp->z_lock); |
871 | vn_vfsunlock(vp); | |
428870ff BB |
872 | } else { |
873 | error = zfs_dropname(dl, zp, dzp, tx, flag); | |
874 | if (error != 0) | |
875 | return (error); | |
34dc7c2f BB |
876 | } |
877 | ||
34dc7c2f | 878 | mutex_enter(&dzp->z_lock); |
428870ff BB |
879 | dzp->z_size--; /* one dirent removed */ |
880 | dzp->z_links -= zp_is_dir; /* ".." link from zp */ | |
881 | SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), | |
882 | NULL, &dzp->z_links, sizeof (dzp->z_links)); | |
883 | SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), | |
884 | NULL, &dzp->z_size, sizeof (dzp->z_size)); | |
885 | SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), | |
886 | NULL, ctime, sizeof (ctime)); | |
887 | SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), | |
888 | NULL, mtime, sizeof (mtime)); | |
889 | SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), | |
890 | NULL, &dzp->z_pflags, sizeof (dzp->z_pflags)); | |
891 | zfs_tstamp_update_setup(dzp, CONTENT_MODIFIED, mtime, ctime, B_TRUE); | |
892 | error = sa_bulk_update(dzp->z_sa_hdl, bulk, count, tx); | |
34dc7c2f | 893 | ASSERT(error == 0); |
428870ff | 894 | mutex_exit(&dzp->z_lock); |
34dc7c2f BB |
895 | |
896 | if (unlinkedp != NULL) | |
897 | *unlinkedp = unlinked; | |
898 | else if (unlinked) | |
899 | zfs_unlinked_add(zp, tx); | |
900 | ||
901 | return (0); | |
902 | } | |
903 | ||
904 | /* | |
905 | * Indicate whether the directory is empty. Works with or without z_lock | |
906 | * held, but can only be consider a hint in the latter case. Returns true | |
907 | * if only "." and ".." remain and there's no work in progress. | |
908 | */ | |
909 | boolean_t | |
910 | zfs_dirempty(znode_t *dzp) | |
911 | { | |
428870ff | 912 | return (dzp->z_size == 2 && dzp->z_dirlocks == 0); |
34dc7c2f BB |
913 | } |
914 | ||
915 | int | |
916 | zfs_make_xattrdir(znode_t *zp, vattr_t *vap, vnode_t **xvpp, cred_t *cr) | |
917 | { | |
918 | zfsvfs_t *zfsvfs = zp->z_zfsvfs; | |
919 | znode_t *xzp; | |
920 | dmu_tx_t *tx; | |
921 | int error; | |
9babb374 BB |
922 | zfs_acl_ids_t acl_ids; |
923 | boolean_t fuid_dirtied; | |
428870ff | 924 | uint64_t parent; |
34dc7c2f BB |
925 | |
926 | *xvpp = NULL; | |
927 | ||
928 | if (error = zfs_zaccess(zp, ACE_WRITE_NAMED_ATTRS, 0, B_FALSE, cr)) | |
929 | return (error); | |
930 | ||
9babb374 BB |
931 | if ((error = zfs_acl_ids_create(zp, IS_XATTR, vap, cr, NULL, |
932 | &acl_ids)) != 0) | |
933 | return (error); | |
934 | if (zfs_acl_ids_overquota(zfsvfs, &acl_ids)) { | |
935 | zfs_acl_ids_free(&acl_ids); | |
936 | return (EDQUOT); | |
937 | } | |
938 | ||
428870ff | 939 | top: |
34dc7c2f | 940 | tx = dmu_tx_create(zfsvfs->z_os); |
428870ff BB |
941 | dmu_tx_hold_sa_create(tx, acl_ids.z_aclp->z_acl_bytes + |
942 | ZFS_SA_BASE_ATTR_SIZE); | |
943 | dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE); | |
34dc7c2f | 944 | dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, FALSE, NULL); |
9babb374 BB |
945 | fuid_dirtied = zfsvfs->z_fuid_dirty; |
946 | if (fuid_dirtied) | |
947 | zfs_fuid_txhold(zfsvfs, tx); | |
fb5f0bc8 | 948 | error = dmu_tx_assign(tx, TXG_NOWAIT); |
34dc7c2f | 949 | if (error) { |
428870ff | 950 | if (error == ERESTART) { |
34dc7c2f | 951 | dmu_tx_wait(tx); |
428870ff BB |
952 | dmu_tx_abort(tx); |
953 | goto top; | |
954 | } | |
955 | zfs_acl_ids_free(&acl_ids); | |
34dc7c2f BB |
956 | dmu_tx_abort(tx); |
957 | return (error); | |
958 | } | |
428870ff | 959 | zfs_mknode(zp, vap, tx, cr, IS_XATTR, &xzp, &acl_ids); |
9babb374 BB |
960 | |
961 | if (fuid_dirtied) | |
962 | zfs_fuid_sync(zfsvfs, tx); | |
963 | ||
428870ff BB |
964 | #ifdef DEBUG |
965 | error = sa_lookup(xzp->z_sa_hdl, SA_ZPL_PARENT(zfsvfs), | |
966 | &parent, sizeof (parent)); | |
967 | ASSERT(error == 0 && parent == zp->z_id); | |
968 | #endif | |
969 | ||
970 | VERIFY(0 == sa_update(zp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs), &xzp->z_id, | |
971 | sizeof (xzp->z_id), tx)); | |
34dc7c2f BB |
972 | |
973 | (void) zfs_log_create(zfsvfs->z_log, tx, TX_MKXATTR, zp, | |
9babb374 BB |
974 | xzp, "", NULL, acl_ids.z_fuidp, vap); |
975 | ||
976 | zfs_acl_ids_free(&acl_ids); | |
34dc7c2f BB |
977 | dmu_tx_commit(tx); |
978 | ||
979 | *xvpp = ZTOV(xzp); | |
980 | ||
981 | return (0); | |
982 | } | |
983 | ||
984 | /* | |
985 | * Return a znode for the extended attribute directory for zp. | |
986 | * ** If the directory does not already exist, it is created ** | |
987 | * | |
988 | * IN: zp - znode to obtain attribute directory from | |
989 | * cr - credentials of caller | |
990 | * flags - flags from the VOP_LOOKUP call | |
991 | * | |
992 | * OUT: xzpp - pointer to extended attribute znode | |
993 | * | |
994 | * RETURN: 0 on success | |
995 | * error number on failure | |
996 | */ | |
997 | int | |
998 | zfs_get_xattrdir(znode_t *zp, vnode_t **xvpp, cred_t *cr, int flags) | |
999 | { | |
1000 | zfsvfs_t *zfsvfs = zp->z_zfsvfs; | |
1001 | znode_t *xzp; | |
1002 | zfs_dirlock_t *dl; | |
1003 | vattr_t va; | |
1004 | int error; | |
1005 | top: | |
1006 | error = zfs_dirent_lock(&dl, zp, "", &xzp, ZXATTR, NULL, NULL); | |
1007 | if (error) | |
1008 | return (error); | |
1009 | ||
1010 | if (xzp != NULL) { | |
1011 | *xvpp = ZTOV(xzp); | |
1012 | zfs_dirent_unlock(dl); | |
1013 | return (0); | |
1014 | } | |
1015 | ||
34dc7c2f BB |
1016 | |
1017 | if (!(flags & CREATE_XATTR_DIR)) { | |
1018 | zfs_dirent_unlock(dl); | |
1019 | return (ENOENT); | |
1020 | } | |
1021 | ||
1022 | if (zfsvfs->z_vfs->vfs_flag & VFS_RDONLY) { | |
1023 | zfs_dirent_unlock(dl); | |
1024 | return (EROFS); | |
1025 | } | |
1026 | ||
1027 | /* | |
1028 | * The ability to 'create' files in an attribute | |
1029 | * directory comes from the write_xattr permission on the base file. | |
1030 | * | |
1031 | * The ability to 'search' an attribute directory requires | |
1032 | * read_xattr permission on the base file. | |
1033 | * | |
1034 | * Once in a directory the ability to read/write attributes | |
1035 | * is controlled by the permissions on the attribute file. | |
1036 | */ | |
1037 | va.va_mask = AT_TYPE | AT_MODE | AT_UID | AT_GID; | |
1038 | va.va_type = VDIR; | |
1039 | va.va_mode = S_IFDIR | S_ISVTX | 0777; | |
1040 | zfs_fuid_map_ids(zp, cr, &va.va_uid, &va.va_gid); | |
1041 | ||
1042 | error = zfs_make_xattrdir(zp, &va, xvpp, cr); | |
1043 | zfs_dirent_unlock(dl); | |
1044 | ||
fb5f0bc8 | 1045 | if (error == ERESTART) { |
34dc7c2f BB |
1046 | /* NB: we already did dmu_tx_wait() if necessary */ |
1047 | goto top; | |
1048 | } | |
1049 | ||
1050 | return (error); | |
1051 | } | |
1052 | ||
1053 | /* | |
1054 | * Decide whether it is okay to remove within a sticky directory. | |
1055 | * | |
1056 | * In sticky directories, write access is not sufficient; | |
1057 | * you can remove entries from a directory only if: | |
1058 | * | |
1059 | * you own the directory, | |
1060 | * you own the entry, | |
1061 | * the entry is a plain file and you have write access, | |
1062 | * or you are privileged (checked in secpolicy...). | |
1063 | * | |
1064 | * The function returns 0 if remove access is granted. | |
1065 | */ | |
1066 | int | |
1067 | zfs_sticky_remove_access(znode_t *zdp, znode_t *zp, cred_t *cr) | |
1068 | { | |
1069 | uid_t uid; | |
572e2857 BB |
1070 | uid_t downer; |
1071 | uid_t fowner; | |
1072 | zfsvfs_t *zfsvfs = zdp->z_zfsvfs; | |
34dc7c2f | 1073 | |
fb5f0bc8 | 1074 | if (zdp->z_zfsvfs->z_replay) |
34dc7c2f BB |
1075 | return (0); |
1076 | ||
428870ff | 1077 | if ((zdp->z_mode & S_ISVTX) == 0) |
34dc7c2f BB |
1078 | return (0); |
1079 | ||
572e2857 BB |
1080 | downer = zfs_fuid_map_id(zfsvfs, zdp->z_uid, cr, ZFS_OWNER); |
1081 | fowner = zfs_fuid_map_id(zfsvfs, zp->z_uid, cr, ZFS_OWNER); | |
1082 | ||
1083 | if ((uid = crgetuid(cr)) == downer || uid == fowner || | |
34dc7c2f BB |
1084 | (ZTOV(zp)->v_type == VREG && |
1085 | zfs_zaccess(zp, ACE_WRITE_DATA, 0, B_FALSE, cr) == 0)) | |
1086 | return (0); | |
1087 | else | |
1088 | return (secpolicy_vnode_remove(cr)); | |
1089 | } |