]>
Commit | Line | Data |
---|---|---|
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 | ||
22 | /* | |
23 | * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. | |
24 | * Copyright (c) 2013, 2016 by Delphix. All rights reserved. | |
25 | * Copyright 2017 Nexenta Systems, Inc. | |
26 | */ | |
27 | ||
28 | #include <sys/types.h> | |
29 | #include <sys/param.h> | |
30 | #include <sys/time.h> | |
31 | #include <sys/systm.h> | |
32 | #include <sys/sysmacros.h> | |
33 | #include <sys/resource.h> | |
34 | #include <sys/vfs.h> | |
35 | #include <sys/vnode.h> | |
36 | #include <sys/file.h> | |
37 | #include <sys/mode.h> | |
38 | #include <sys/kmem.h> | |
39 | #include <sys/uio.h> | |
40 | #include <sys/pathname.h> | |
41 | #include <sys/cmn_err.h> | |
42 | #include <sys/errno.h> | |
43 | #include <sys/stat.h> | |
44 | #include <sys/unistd.h> | |
45 | #include <sys/sunddi.h> | |
46 | #include <sys/random.h> | |
47 | #include <sys/policy.h> | |
48 | #include <sys/zfs_dir.h> | |
49 | #include <sys/zfs_acl.h> | |
50 | #include <sys/zfs_vnops.h> | |
51 | #include <sys/fs/zfs.h> | |
52 | #include "fs/fs_subr.h" | |
53 | #include <sys/zap.h> | |
54 | #include <sys/dmu.h> | |
55 | #include <sys/atomic.h> | |
56 | #include <sys/zfs_ctldir.h> | |
57 | #include <sys/zfs_fuid.h> | |
58 | #include <sys/sa.h> | |
59 | #include <sys/zfs_sa.h> | |
60 | #include <sys/dnlc.h> | |
61 | #include <sys/extdirent.h> | |
62 | ||
63 | /* | |
64 | * zfs_match_find() is used by zfs_dirent_lock() to peform zap lookups | |
65 | * of names after deciding which is the appropriate lookup interface. | |
66 | */ | |
67 | static int | |
68 | zfs_match_find(zfsvfs_t *zfsvfs, znode_t *dzp, char *name, matchtype_t mt, | |
69 | boolean_t update, int *deflags, pathname_t *rpnp, uint64_t *zoid) | |
70 | { | |
71 | boolean_t conflict = B_FALSE; | |
72 | int error; | |
73 | ||
74 | if (zfsvfs->z_norm) { | |
75 | size_t bufsz = 0; | |
76 | char *buf = NULL; | |
77 | ||
78 | if (rpnp) { | |
79 | buf = rpnp->pn_buf; | |
80 | bufsz = rpnp->pn_bufsize; | |
81 | } | |
82 | ||
83 | /* | |
84 | * In the non-mixed case we only expect there would ever | |
85 | * be one match, but we need to use the normalizing lookup. | |
86 | */ | |
87 | error = zap_lookup_norm(zfsvfs->z_os, dzp->z_id, name, 8, 1, | |
88 | zoid, mt, buf, bufsz, &conflict); | |
89 | } else { | |
90 | error = zap_lookup(zfsvfs->z_os, dzp->z_id, name, 8, 1, zoid); | |
91 | } | |
92 | ||
93 | /* | |
94 | * Allow multiple entries provided the first entry is | |
95 | * the object id. Non-zpl consumers may safely make | |
96 | * use of the additional space. | |
97 | * | |
98 | * XXX: This should be a feature flag for compatibility | |
99 | */ | |
100 | if (error == EOVERFLOW) | |
101 | error = 0; | |
102 | ||
103 | if (zfsvfs->z_norm && !error && deflags) | |
104 | *deflags = conflict ? ED_CASE_CONFLICT : 0; | |
105 | ||
106 | *zoid = ZFS_DIRENT_OBJ(*zoid); | |
107 | ||
108 | #ifdef HAVE_DNLC | |
109 | if (error == ENOENT && update) | |
110 | dnlc_update(ZTOI(dzp), name, DNLC_NO_VNODE); | |
111 | #endif /* HAVE_DNLC */ | |
112 | ||
113 | return (error); | |
114 | } | |
115 | ||
116 | /* | |
117 | * Lock a directory entry. A dirlock on <dzp, name> protects that name | |
118 | * in dzp's directory zap object. As long as you hold a dirlock, you can | |
119 | * assume two things: (1) dzp cannot be reaped, and (2) no other thread | |
120 | * can change the zap entry for (i.e. link or unlink) this name. | |
121 | * | |
122 | * Input arguments: | |
123 | * dzp - znode for directory | |
124 | * name - name of entry to lock | |
125 | * flag - ZNEW: if the entry already exists, fail with EEXIST. | |
126 | * ZEXISTS: if the entry does not exist, fail with ENOENT. | |
127 | * ZSHARED: allow concurrent access with other ZSHARED callers. | |
128 | * ZXATTR: we want dzp's xattr directory | |
129 | * ZCILOOK: On a mixed sensitivity file system, | |
130 | * this lookup should be case-insensitive. | |
131 | * ZCIEXACT: On a purely case-insensitive file system, | |
132 | * this lookup should be case-sensitive. | |
133 | * ZRENAMING: we are locking for renaming, force narrow locks | |
134 | * ZHAVELOCK: Don't grab the z_name_lock for this call. The | |
135 | * current thread already holds it. | |
136 | * | |
137 | * Output arguments: | |
138 | * zpp - pointer to the znode for the entry (NULL if there isn't one) | |
139 | * dlpp - pointer to the dirlock for this entry (NULL on error) | |
140 | * direntflags - (case-insensitive lookup only) | |
141 | * flags if multiple case-sensitive matches exist in directory | |
142 | * realpnp - (case-insensitive lookup only) | |
143 | * actual name matched within the directory | |
144 | * | |
145 | * Return value: 0 on success or errno on failure. | |
146 | * | |
147 | * NOTE: Always checks for, and rejects, '.' and '..'. | |
148 | * NOTE: For case-insensitive file systems we take wide locks (see below), | |
149 | * but return znode pointers to a single match. | |
150 | */ | |
151 | int | |
152 | zfs_dirent_lock(zfs_dirlock_t **dlpp, znode_t *dzp, char *name, znode_t **zpp, | |
153 | int flag, int *direntflags, pathname_t *realpnp) | |
154 | { | |
155 | zfsvfs_t *zfsvfs = ZTOZSB(dzp); | |
156 | zfs_dirlock_t *dl; | |
157 | boolean_t update; | |
158 | matchtype_t mt = 0; | |
159 | uint64_t zoid; | |
160 | #ifdef HAVE_DNLC | |
161 | vnode_t *vp = NULL; | |
162 | #endif /* HAVE_DNLC */ | |
163 | int error = 0; | |
164 | int cmpflags; | |
165 | ||
166 | *zpp = NULL; | |
167 | *dlpp = NULL; | |
168 | ||
169 | /* | |
170 | * Verify that we are not trying to lock '.', '..', or '.zfs' | |
171 | */ | |
172 | if ((name[0] == '.' && | |
173 | (name[1] == '\0' || (name[1] == '.' && name[2] == '\0'))) || | |
174 | (zfs_has_ctldir(dzp) && strcmp(name, ZFS_CTLDIR_NAME) == 0)) | |
175 | return (SET_ERROR(EEXIST)); | |
176 | ||
177 | /* | |
178 | * Case sensitivity and normalization preferences are set when | |
179 | * the file system is created. These are stored in the | |
180 | * zfsvfs->z_case and zfsvfs->z_norm fields. These choices | |
181 | * affect what vnodes can be cached in the DNLC, how we | |
182 | * perform zap lookups, and the "width" of our dirlocks. | |
183 | * | |
184 | * A normal dirlock locks a single name. Note that with | |
185 | * normalization a name can be composed multiple ways, but | |
186 | * when normalized, these names all compare equal. A wide | |
187 | * dirlock locks multiple names. We need these when the file | |
188 | * system is supporting mixed-mode access. It is sometimes | |
189 | * necessary to lock all case permutations of file name at | |
190 | * once so that simultaneous case-insensitive/case-sensitive | |
191 | * behaves as rationally as possible. | |
192 | */ | |
193 | ||
194 | /* | |
195 | * When matching we may need to normalize & change case according to | |
196 | * FS settings. | |
197 | * | |
198 | * Note that a normalized match is necessary for a case insensitive | |
199 | * filesystem when the lookup request is not exact because normalization | |
200 | * can fold case independent of normalizing code point sequences. | |
201 | * | |
202 | * See the table above zfs_dropname(). | |
203 | */ | |
204 | if (zfsvfs->z_norm != 0) { | |
205 | mt = MT_NORMALIZE; | |
206 | ||
207 | /* | |
208 | * Determine if the match needs to honor the case specified in | |
209 | * lookup, and if so keep track of that so that during | |
210 | * normalization we don't fold case. | |
211 | */ | |
212 | if ((zfsvfs->z_case == ZFS_CASE_INSENSITIVE && | |
213 | (flag & ZCIEXACT)) || | |
214 | (zfsvfs->z_case == ZFS_CASE_MIXED && !(flag & ZCILOOK))) { | |
215 | mt |= MT_MATCH_CASE; | |
216 | } | |
217 | } | |
218 | ||
219 | /* | |
220 | * Only look in or update the DNLC if we are looking for the | |
221 | * name on a file system that does not require normalization | |
222 | * or case folding. We can also look there if we happen to be | |
223 | * on a non-normalizing, mixed sensitivity file system IF we | |
224 | * are looking for the exact name. | |
225 | * | |
226 | * Maybe can add TO-UPPERed version of name to dnlc in ci-only | |
227 | * case for performance improvement? | |
228 | */ | |
229 | update = !zfsvfs->z_norm || | |
230 | (zfsvfs->z_case == ZFS_CASE_MIXED && | |
231 | !(zfsvfs->z_norm & ~U8_TEXTPREP_TOUPPER) && !(flag & ZCILOOK)); | |
232 | ||
233 | /* | |
234 | * ZRENAMING indicates we are in a situation where we should | |
235 | * take narrow locks regardless of the file system's | |
236 | * preferences for normalizing and case folding. This will | |
237 | * prevent us deadlocking trying to grab the same wide lock | |
238 | * twice if the two names happen to be case-insensitive | |
239 | * matches. | |
240 | */ | |
241 | if (flag & ZRENAMING) | |
242 | cmpflags = 0; | |
243 | else | |
244 | cmpflags = zfsvfs->z_norm; | |
245 | ||
246 | /* | |
247 | * Wait until there are no locks on this name. | |
248 | * | |
249 | * Don't grab the the lock if it is already held. However, cannot | |
250 | * have both ZSHARED and ZHAVELOCK together. | |
251 | */ | |
252 | ASSERT(!(flag & ZSHARED) || !(flag & ZHAVELOCK)); | |
253 | if (!(flag & ZHAVELOCK)) | |
254 | rw_enter(&dzp->z_name_lock, RW_READER); | |
255 | ||
256 | mutex_enter(&dzp->z_lock); | |
257 | for (;;) { | |
258 | if (dzp->z_unlinked && !(flag & ZXATTR)) { | |
259 | mutex_exit(&dzp->z_lock); | |
260 | if (!(flag & ZHAVELOCK)) | |
261 | rw_exit(&dzp->z_name_lock); | |
262 | return (SET_ERROR(ENOENT)); | |
263 | } | |
264 | for (dl = dzp->z_dirlocks; dl != NULL; dl = dl->dl_next) { | |
265 | if ((u8_strcmp(name, dl->dl_name, 0, cmpflags, | |
266 | U8_UNICODE_LATEST, &error) == 0) || error != 0) | |
267 | break; | |
268 | } | |
269 | if (error != 0) { | |
270 | mutex_exit(&dzp->z_lock); | |
271 | if (!(flag & ZHAVELOCK)) | |
272 | rw_exit(&dzp->z_name_lock); | |
273 | return (SET_ERROR(ENOENT)); | |
274 | } | |
275 | if (dl == NULL) { | |
276 | /* | |
277 | * Allocate a new dirlock and add it to the list. | |
278 | */ | |
279 | dl = kmem_alloc(sizeof (zfs_dirlock_t), KM_SLEEP); | |
280 | cv_init(&dl->dl_cv, NULL, CV_DEFAULT, NULL); | |
281 | dl->dl_name = name; | |
282 | dl->dl_sharecnt = 0; | |
283 | dl->dl_namelock = 0; | |
284 | dl->dl_namesize = 0; | |
285 | dl->dl_dzp = dzp; | |
286 | dl->dl_next = dzp->z_dirlocks; | |
287 | dzp->z_dirlocks = dl; | |
288 | break; | |
289 | } | |
290 | if ((flag & ZSHARED) && dl->dl_sharecnt != 0) | |
291 | break; | |
292 | cv_wait(&dl->dl_cv, &dzp->z_lock); | |
293 | } | |
294 | ||
295 | /* | |
296 | * If the z_name_lock was NOT held for this dirlock record it. | |
297 | */ | |
298 | if (flag & ZHAVELOCK) | |
299 | dl->dl_namelock = 1; | |
300 | ||
301 | if ((flag & ZSHARED) && ++dl->dl_sharecnt > 1 && dl->dl_namesize == 0) { | |
302 | /* | |
303 | * We're the second shared reference to dl. Make a copy of | |
304 | * dl_name in case the first thread goes away before we do. | |
305 | * Note that we initialize the new name before storing its | |
306 | * pointer into dl_name, because the first thread may load | |
307 | * dl->dl_name at any time. It'll either see the old value, | |
308 | * which belongs to it, or the new shared copy; either is OK. | |
309 | */ | |
310 | dl->dl_namesize = strlen(dl->dl_name) + 1; | |
311 | name = kmem_alloc(dl->dl_namesize, KM_SLEEP); | |
312 | bcopy(dl->dl_name, name, dl->dl_namesize); | |
313 | dl->dl_name = name; | |
314 | } | |
315 | ||
316 | mutex_exit(&dzp->z_lock); | |
317 | ||
318 | /* | |
319 | * We have a dirlock on the name. (Note that it is the dirlock, | |
320 | * not the dzp's z_lock, that protects the name in the zap object.) | |
321 | * See if there's an object by this name; if so, put a hold on it. | |
322 | */ | |
323 | if (flag & ZXATTR) { | |
324 | error = sa_lookup(dzp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs), &zoid, | |
325 | sizeof (zoid)); | |
326 | if (error == 0) | |
327 | error = (zoid == 0 ? SET_ERROR(ENOENT) : 0); | |
328 | } else { | |
329 | #ifdef HAVE_DNLC | |
330 | if (update) | |
331 | vp = dnlc_lookup(ZTOI(dzp), name); | |
332 | if (vp == DNLC_NO_VNODE) { | |
333 | iput(vp); | |
334 | error = SET_ERROR(ENOENT); | |
335 | } else if (vp) { | |
336 | if (flag & ZNEW) { | |
337 | zfs_dirent_unlock(dl); | |
338 | iput(vp); | |
339 | return (SET_ERROR(EEXIST)); | |
340 | } | |
341 | *dlpp = dl; | |
342 | *zpp = VTOZ(vp); | |
343 | return (0); | |
344 | } else { | |
345 | error = zfs_match_find(zfsvfs, dzp, name, mt, | |
346 | update, direntflags, realpnp, &zoid); | |
347 | } | |
348 | #else | |
349 | error = zfs_match_find(zfsvfs, dzp, name, mt, | |
350 | update, direntflags, realpnp, &zoid); | |
351 | #endif /* HAVE_DNLC */ | |
352 | } | |
353 | if (error) { | |
354 | if (error != ENOENT || (flag & ZEXISTS)) { | |
355 | zfs_dirent_unlock(dl); | |
356 | return (error); | |
357 | } | |
358 | } else { | |
359 | if (flag & ZNEW) { | |
360 | zfs_dirent_unlock(dl); | |
361 | return (SET_ERROR(EEXIST)); | |
362 | } | |
363 | error = zfs_zget(zfsvfs, zoid, zpp); | |
364 | if (error) { | |
365 | zfs_dirent_unlock(dl); | |
366 | return (error); | |
367 | } | |
368 | #ifdef HAVE_DNLC | |
369 | if (!(flag & ZXATTR) && update) | |
370 | dnlc_update(ZTOI(dzp), name, ZTOI(*zpp)); | |
371 | #endif /* HAVE_DNLC */ | |
372 | } | |
373 | ||
374 | *dlpp = dl; | |
375 | ||
376 | return (0); | |
377 | } | |
378 | ||
379 | /* | |
380 | * Unlock this directory entry and wake anyone who was waiting for it. | |
381 | */ | |
382 | void | |
383 | zfs_dirent_unlock(zfs_dirlock_t *dl) | |
384 | { | |
385 | znode_t *dzp = dl->dl_dzp; | |
386 | zfs_dirlock_t **prev_dl, *cur_dl; | |
387 | ||
388 | mutex_enter(&dzp->z_lock); | |
389 | ||
390 | if (!dl->dl_namelock) | |
391 | rw_exit(&dzp->z_name_lock); | |
392 | ||
393 | if (dl->dl_sharecnt > 1) { | |
394 | dl->dl_sharecnt--; | |
395 | mutex_exit(&dzp->z_lock); | |
396 | return; | |
397 | } | |
398 | prev_dl = &dzp->z_dirlocks; | |
399 | while ((cur_dl = *prev_dl) != dl) | |
400 | prev_dl = &cur_dl->dl_next; | |
401 | *prev_dl = dl->dl_next; | |
402 | cv_broadcast(&dl->dl_cv); | |
403 | mutex_exit(&dzp->z_lock); | |
404 | ||
405 | if (dl->dl_namesize != 0) | |
406 | kmem_free(dl->dl_name, dl->dl_namesize); | |
407 | cv_destroy(&dl->dl_cv); | |
408 | kmem_free(dl, sizeof (*dl)); | |
409 | } | |
410 | ||
411 | /* | |
412 | * Look up an entry in a directory. | |
413 | * | |
414 | * NOTE: '.' and '..' are handled as special cases because | |
415 | * no directory entries are actually stored for them. If this is | |
416 | * the root of a filesystem, then '.zfs' is also treated as a | |
417 | * special pseudo-directory. | |
418 | */ | |
419 | int | |
420 | zfs_dirlook(znode_t *dzp, char *name, struct inode **ipp, int flags, | |
421 | int *deflg, pathname_t *rpnp) | |
422 | { | |
423 | zfs_dirlock_t *dl; | |
424 | znode_t *zp; | |
425 | int error = 0; | |
426 | uint64_t parent; | |
427 | ||
428 | if (name[0] == 0 || (name[0] == '.' && name[1] == 0)) { | |
429 | *ipp = ZTOI(dzp); | |
430 | igrab(*ipp); | |
431 | } else if (name[0] == '.' && name[1] == '.' && name[2] == 0) { | |
432 | zfsvfs_t *zfsvfs = ZTOZSB(dzp); | |
433 | ||
434 | /* | |
435 | * If we are a snapshot mounted under .zfs, return | |
436 | * the inode pointer for the snapshot directory. | |
437 | */ | |
438 | if ((error = sa_lookup(dzp->z_sa_hdl, | |
439 | SA_ZPL_PARENT(zfsvfs), &parent, sizeof (parent))) != 0) | |
440 | return (error); | |
441 | ||
442 | if (parent == dzp->z_id && zfsvfs->z_parent != zfsvfs) { | |
443 | error = zfsctl_root_lookup(zfsvfs->z_parent->z_ctldir, | |
444 | "snapshot", ipp, 0, kcred, NULL, NULL); | |
445 | return (error); | |
446 | } | |
447 | rw_enter(&dzp->z_parent_lock, RW_READER); | |
448 | error = zfs_zget(zfsvfs, parent, &zp); | |
449 | if (error == 0) | |
450 | *ipp = ZTOI(zp); | |
451 | rw_exit(&dzp->z_parent_lock); | |
452 | } else if (zfs_has_ctldir(dzp) && strcmp(name, ZFS_CTLDIR_NAME) == 0) { | |
453 | *ipp = zfsctl_root(dzp); | |
454 | } else { | |
455 | int zf; | |
456 | ||
457 | zf = ZEXISTS | ZSHARED; | |
458 | if (flags & FIGNORECASE) | |
459 | zf |= ZCILOOK; | |
460 | ||
461 | error = zfs_dirent_lock(&dl, dzp, name, &zp, zf, deflg, rpnp); | |
462 | if (error == 0) { | |
463 | *ipp = ZTOI(zp); | |
464 | zfs_dirent_unlock(dl); | |
465 | dzp->z_zn_prefetch = B_TRUE; /* enable prefetching */ | |
466 | } | |
467 | rpnp = NULL; | |
468 | } | |
469 | ||
470 | if ((flags & FIGNORECASE) && rpnp && !error) | |
471 | (void) strlcpy(rpnp->pn_buf, name, rpnp->pn_bufsize); | |
472 | ||
473 | return (error); | |
474 | } | |
475 | ||
476 | /* | |
477 | * unlinked Set (formerly known as the "delete queue") Error Handling | |
478 | * | |
479 | * When dealing with the unlinked set, we dmu_tx_hold_zap(), but we | |
480 | * don't specify the name of the entry that we will be manipulating. We | |
481 | * also fib and say that we won't be adding any new entries to the | |
482 | * unlinked set, even though we might (this is to lower the minimum file | |
483 | * size that can be deleted in a full filesystem). So on the small | |
484 | * chance that the nlink list is using a fat zap (ie. has more than | |
485 | * 2000 entries), we *may* not pre-read a block that's needed. | |
486 | * Therefore it is remotely possible for some of the assertions | |
487 | * regarding the unlinked set below to fail due to i/o error. On a | |
488 | * nondebug system, this will result in the space being leaked. | |
489 | */ | |
490 | void | |
491 | zfs_unlinked_add(znode_t *zp, dmu_tx_t *tx) | |
492 | { | |
493 | zfsvfs_t *zfsvfs = ZTOZSB(zp); | |
494 | ||
495 | ASSERT(zp->z_unlinked); | |
496 | ASSERT(ZTOI(zp)->i_nlink == 0); | |
497 | ||
498 | VERIFY3U(0, ==, | |
499 | zap_add_int(zfsvfs->z_os, zfsvfs->z_unlinkedobj, zp->z_id, tx)); | |
500 | } | |
501 | ||
502 | /* | |
503 | * Clean up any znodes that had no links when we either crashed or | |
504 | * (force) umounted the file system. | |
505 | */ | |
506 | void | |
507 | zfs_unlinked_drain(zfsvfs_t *zfsvfs) | |
508 | { | |
509 | zap_cursor_t zc; | |
510 | zap_attribute_t zap; | |
511 | dmu_object_info_t doi; | |
512 | znode_t *zp; | |
513 | int error; | |
514 | ||
515 | /* | |
516 | * Iterate over the contents of the unlinked set. | |
517 | */ | |
518 | for (zap_cursor_init(&zc, zfsvfs->z_os, zfsvfs->z_unlinkedobj); | |
519 | zap_cursor_retrieve(&zc, &zap) == 0; | |
520 | zap_cursor_advance(&zc)) { | |
521 | ||
522 | /* | |
523 | * See what kind of object we have in list | |
524 | */ | |
525 | ||
526 | error = dmu_object_info(zfsvfs->z_os, | |
527 | zap.za_first_integer, &doi); | |
528 | if (error != 0) | |
529 | continue; | |
530 | ||
531 | ASSERT((doi.doi_type == DMU_OT_PLAIN_FILE_CONTENTS) || | |
532 | (doi.doi_type == DMU_OT_DIRECTORY_CONTENTS)); | |
533 | /* | |
534 | * We need to re-mark these list entries for deletion, | |
535 | * so we pull them back into core and set zp->z_unlinked. | |
536 | */ | |
537 | error = zfs_zget(zfsvfs, zap.za_first_integer, &zp); | |
538 | ||
539 | /* | |
540 | * We may pick up znodes that are already marked for deletion. | |
541 | * This could happen during the purge of an extended attribute | |
542 | * directory. All we need to do is skip over them, since they | |
543 | * are already in the system marked z_unlinked. | |
544 | */ | |
545 | if (error != 0) | |
546 | continue; | |
547 | ||
548 | zp->z_unlinked = B_TRUE; | |
549 | iput(ZTOI(zp)); | |
550 | } | |
551 | zap_cursor_fini(&zc); | |
552 | } | |
553 | ||
554 | /* | |
555 | * Delete the entire contents of a directory. Return a count | |
556 | * of the number of entries that could not be deleted. If we encounter | |
557 | * an error, return a count of at least one so that the directory stays | |
558 | * in the unlinked set. | |
559 | * | |
560 | * NOTE: this function assumes that the directory is inactive, | |
561 | * so there is no need to lock its entries before deletion. | |
562 | * Also, it assumes the directory contents is *only* regular | |
563 | * files. | |
564 | */ | |
565 | static int | |
566 | zfs_purgedir(znode_t *dzp) | |
567 | { | |
568 | zap_cursor_t zc; | |
569 | zap_attribute_t zap; | |
570 | znode_t *xzp; | |
571 | dmu_tx_t *tx; | |
572 | zfsvfs_t *zfsvfs = ZTOZSB(dzp); | |
573 | zfs_dirlock_t dl; | |
574 | int skipped = 0; | |
575 | int error; | |
576 | ||
577 | for (zap_cursor_init(&zc, zfsvfs->z_os, dzp->z_id); | |
578 | (error = zap_cursor_retrieve(&zc, &zap)) == 0; | |
579 | zap_cursor_advance(&zc)) { | |
580 | error = zfs_zget(zfsvfs, | |
581 | ZFS_DIRENT_OBJ(zap.za_first_integer), &xzp); | |
582 | if (error) { | |
583 | skipped += 1; | |
584 | continue; | |
585 | } | |
586 | ||
587 | ASSERT(S_ISREG(ZTOI(xzp)->i_mode) || | |
588 | S_ISLNK(ZTOI(xzp)->i_mode)); | |
589 | ||
590 | tx = dmu_tx_create(zfsvfs->z_os); | |
591 | dmu_tx_hold_sa(tx, dzp->z_sa_hdl, B_FALSE); | |
592 | dmu_tx_hold_zap(tx, dzp->z_id, FALSE, zap.za_name); | |
593 | dmu_tx_hold_sa(tx, xzp->z_sa_hdl, B_FALSE); | |
594 | dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL); | |
595 | /* Is this really needed ? */ | |
596 | zfs_sa_upgrade_txholds(tx, xzp); | |
597 | dmu_tx_mark_netfree(tx); | |
598 | error = dmu_tx_assign(tx, TXG_WAIT); | |
599 | if (error) { | |
600 | dmu_tx_abort(tx); | |
601 | zfs_iput_async(ZTOI(xzp)); | |
602 | skipped += 1; | |
603 | continue; | |
604 | } | |
605 | bzero(&dl, sizeof (dl)); | |
606 | dl.dl_dzp = dzp; | |
607 | dl.dl_name = zap.za_name; | |
608 | ||
609 | error = zfs_link_destroy(&dl, xzp, tx, 0, NULL); | |
610 | if (error) | |
611 | skipped += 1; | |
612 | dmu_tx_commit(tx); | |
613 | ||
614 | zfs_iput_async(ZTOI(xzp)); | |
615 | } | |
616 | zap_cursor_fini(&zc); | |
617 | if (error != ENOENT) | |
618 | skipped += 1; | |
619 | return (skipped); | |
620 | } | |
621 | ||
622 | void | |
623 | zfs_rmnode(znode_t *zp) | |
624 | { | |
625 | zfsvfs_t *zfsvfs = ZTOZSB(zp); | |
626 | objset_t *os = zfsvfs->z_os; | |
627 | znode_t *xzp = NULL; | |
628 | dmu_tx_t *tx; | |
629 | uint64_t acl_obj; | |
630 | uint64_t xattr_obj; | |
631 | uint64_t links; | |
632 | int error; | |
633 | ||
634 | ASSERT(ZTOI(zp)->i_nlink == 0); | |
635 | ASSERT(atomic_read(&ZTOI(zp)->i_count) == 0); | |
636 | ||
637 | /* | |
638 | * If this is an attribute directory, purge its contents. | |
639 | */ | |
640 | if (S_ISDIR(ZTOI(zp)->i_mode) && (zp->z_pflags & ZFS_XATTR)) { | |
641 | if (zfs_purgedir(zp) != 0) { | |
642 | /* | |
643 | * Not enough space to delete some xattrs. | |
644 | * Leave it in the unlinked set. | |
645 | */ | |
646 | zfs_znode_dmu_fini(zp); | |
647 | ||
648 | return; | |
649 | } | |
650 | } | |
651 | ||
652 | /* | |
653 | * Free up all the data in the file. We don't do this for directories | |
654 | * because we need truncate and remove to be in the same tx, like in | |
655 | * zfs_znode_delete(). Otherwise, if we crash here we'll end up with | |
656 | * an inconsistent truncated zap object in the delete queue. Note a | |
657 | * truncated file is harmless since it only contains user data. | |
658 | */ | |
659 | if (S_ISREG(ZTOI(zp)->i_mode)) { | |
660 | error = dmu_free_long_range(os, zp->z_id, 0, DMU_OBJECT_END); | |
661 | if (error) { | |
662 | /* | |
663 | * Not enough space or we were interrupted by unmount. | |
664 | * Leave the file in the unlinked set. | |
665 | */ | |
666 | zfs_znode_dmu_fini(zp); | |
667 | return; | |
668 | } | |
669 | } | |
670 | ||
671 | /* | |
672 | * If the file has extended attributes, we're going to unlink | |
673 | * the xattr dir. | |
674 | */ | |
675 | error = sa_lookup(zp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs), | |
676 | &xattr_obj, sizeof (xattr_obj)); | |
677 | if (error == 0 && xattr_obj) { | |
678 | error = zfs_zget(zfsvfs, xattr_obj, &xzp); | |
679 | ASSERT(error == 0); | |
680 | } | |
681 | ||
682 | acl_obj = zfs_external_acl(zp); | |
683 | ||
684 | /* | |
685 | * Set up the final transaction. | |
686 | */ | |
687 | tx = dmu_tx_create(os); | |
688 | dmu_tx_hold_free(tx, zp->z_id, 0, DMU_OBJECT_END); | |
689 | dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL); | |
690 | if (xzp) { | |
691 | dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, TRUE, NULL); | |
692 | dmu_tx_hold_sa(tx, xzp->z_sa_hdl, B_FALSE); | |
693 | } | |
694 | if (acl_obj) | |
695 | dmu_tx_hold_free(tx, acl_obj, 0, DMU_OBJECT_END); | |
696 | ||
697 | zfs_sa_upgrade_txholds(tx, zp); | |
698 | error = dmu_tx_assign(tx, TXG_WAIT); | |
699 | if (error) { | |
700 | /* | |
701 | * Not enough space to delete the file. Leave it in the | |
702 | * unlinked set, leaking it until the fs is remounted (at | |
703 | * which point we'll call zfs_unlinked_drain() to process it). | |
704 | */ | |
705 | dmu_tx_abort(tx); | |
706 | zfs_znode_dmu_fini(zp); | |
707 | goto out; | |
708 | } | |
709 | ||
710 | if (xzp) { | |
711 | ASSERT(error == 0); | |
712 | mutex_enter(&xzp->z_lock); | |
713 | xzp->z_unlinked = B_TRUE; /* mark xzp for deletion */ | |
714 | clear_nlink(ZTOI(xzp)); /* no more links to it */ | |
715 | links = 0; | |
716 | VERIFY(0 == sa_update(xzp->z_sa_hdl, SA_ZPL_LINKS(zfsvfs), | |
717 | &links, sizeof (links), tx)); | |
718 | mutex_exit(&xzp->z_lock); | |
719 | zfs_unlinked_add(xzp, tx); | |
720 | } | |
721 | ||
722 | /* Remove this znode from the unlinked set */ | |
723 | VERIFY3U(0, ==, | |
724 | zap_remove_int(zfsvfs->z_os, zfsvfs->z_unlinkedobj, zp->z_id, tx)); | |
725 | ||
726 | zfs_znode_delete(zp, tx); | |
727 | ||
728 | dmu_tx_commit(tx); | |
729 | out: | |
730 | if (xzp) | |
731 | zfs_iput_async(ZTOI(xzp)); | |
732 | } | |
733 | ||
734 | static uint64_t | |
735 | zfs_dirent(znode_t *zp, uint64_t mode) | |
736 | { | |
737 | uint64_t de = zp->z_id; | |
738 | ||
739 | if (ZTOZSB(zp)->z_version >= ZPL_VERSION_DIRENT_TYPE) | |
740 | de |= IFTODT(mode) << 60; | |
741 | return (de); | |
742 | } | |
743 | ||
744 | /* | |
745 | * Link zp into dl. Can only fail if zp has been unlinked. | |
746 | */ | |
747 | int | |
748 | zfs_link_create(zfs_dirlock_t *dl, znode_t *zp, dmu_tx_t *tx, int flag) | |
749 | { | |
750 | znode_t *dzp = dl->dl_dzp; | |
751 | zfsvfs_t *zfsvfs = ZTOZSB(zp); | |
752 | uint64_t value; | |
753 | int zp_is_dir = S_ISDIR(ZTOI(zp)->i_mode); | |
754 | sa_bulk_attr_t bulk[5]; | |
755 | uint64_t mtime[2], ctime[2]; | |
756 | uint64_t links; | |
757 | int count = 0; | |
758 | int error; | |
759 | ||
760 | mutex_enter(&zp->z_lock); | |
761 | ||
762 | if (!(flag & ZRENAMING)) { | |
763 | if (zp->z_unlinked) { /* no new links to unlinked zp */ | |
764 | ASSERT(!(flag & (ZNEW | ZEXISTS))); | |
765 | mutex_exit(&zp->z_lock); | |
766 | return (SET_ERROR(ENOENT)); | |
767 | } | |
768 | if (!(flag & ZNEW)) { | |
769 | /* | |
770 | * ZNEW nodes come from zfs_mknode() where the link | |
771 | * count has already been initialised | |
772 | */ | |
773 | inc_nlink(ZTOI(zp)); | |
774 | links = ZTOI(zp)->i_nlink; | |
775 | SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), | |
776 | NULL, &links, sizeof (links)); | |
777 | } | |
778 | } | |
779 | SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_PARENT(zfsvfs), NULL, | |
780 | &dzp->z_id, sizeof (dzp->z_id)); | |
781 | SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL, | |
782 | &zp->z_pflags, sizeof (zp->z_pflags)); | |
783 | ||
784 | if (!(flag & ZNEW)) { | |
785 | SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, | |
786 | ctime, sizeof (ctime)); | |
787 | zfs_tstamp_update_setup(zp, STATE_CHANGED, mtime, | |
788 | ctime); | |
789 | } | |
790 | error = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx); | |
791 | ASSERT(error == 0); | |
792 | ||
793 | mutex_exit(&zp->z_lock); | |
794 | ||
795 | mutex_enter(&dzp->z_lock); | |
796 | dzp->z_size++; | |
797 | if (zp_is_dir) | |
798 | inc_nlink(ZTOI(dzp)); | |
799 | links = ZTOI(dzp)->i_nlink; | |
800 | count = 0; | |
801 | SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), NULL, | |
802 | &dzp->z_size, sizeof (dzp->z_size)); | |
803 | SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), NULL, | |
804 | &links, sizeof (links)); | |
805 | SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, | |
806 | mtime, sizeof (mtime)); | |
807 | SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, | |
808 | ctime, sizeof (ctime)); | |
809 | SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL, | |
810 | &dzp->z_pflags, sizeof (dzp->z_pflags)); | |
811 | zfs_tstamp_update_setup(dzp, CONTENT_MODIFIED, mtime, ctime); | |
812 | error = sa_bulk_update(dzp->z_sa_hdl, bulk, count, tx); | |
813 | ASSERT(error == 0); | |
814 | mutex_exit(&dzp->z_lock); | |
815 | ||
816 | value = zfs_dirent(zp, zp->z_mode); | |
817 | error = zap_add(ZTOZSB(zp)->z_os, dzp->z_id, dl->dl_name, | |
818 | 8, 1, &value, tx); | |
819 | ASSERT(error == 0); | |
820 | ||
821 | return (0); | |
822 | } | |
823 | ||
824 | /* | |
825 | * The match type in the code for this function should conform to: | |
826 | * | |
827 | * ------------------------------------------------------------------------ | |
828 | * fs type | z_norm | lookup type | match type | |
829 | * ---------|-------------|-------------|---------------------------------- | |
830 | * CS !norm | 0 | 0 | 0 (exact) | |
831 | * CS norm | formX | 0 | MT_NORMALIZE | |
832 | * CI !norm | upper | !ZCIEXACT | MT_NORMALIZE | |
833 | * CI !norm | upper | ZCIEXACT | MT_NORMALIZE | MT_MATCH_CASE | |
834 | * CI norm | upper|formX | !ZCIEXACT | MT_NORMALIZE | |
835 | * CI norm | upper|formX | ZCIEXACT | MT_NORMALIZE | MT_MATCH_CASE | |
836 | * CM !norm | upper | !ZCILOOK | MT_NORMALIZE | MT_MATCH_CASE | |
837 | * CM !norm | upper | ZCILOOK | MT_NORMALIZE | |
838 | * CM norm | upper|formX | !ZCILOOK | MT_NORMALIZE | MT_MATCH_CASE | |
839 | * CM norm | upper|formX | ZCILOOK | MT_NORMALIZE | |
840 | * | |
841 | * Abbreviations: | |
842 | * CS = Case Sensitive, CI = Case Insensitive, CM = Case Mixed | |
843 | * upper = case folding set by fs type on creation (U8_TEXTPREP_TOUPPER) | |
844 | * formX = unicode normalization form set on fs creation | |
845 | */ | |
846 | static int | |
847 | zfs_dropname(zfs_dirlock_t *dl, znode_t *zp, znode_t *dzp, dmu_tx_t *tx, | |
848 | int flag) | |
849 | { | |
850 | int error; | |
851 | ||
852 | if (ZTOZSB(zp)->z_norm) { | |
853 | matchtype_t mt = MT_NORMALIZE; | |
854 | ||
855 | if ((ZTOZSB(zp)->z_case == ZFS_CASE_INSENSITIVE && | |
856 | (flag & ZCIEXACT)) || | |
857 | (ZTOZSB(zp)->z_case == ZFS_CASE_MIXED && | |
858 | !(flag & ZCILOOK))) { | |
859 | mt |= MT_MATCH_CASE; | |
860 | } | |
861 | ||
862 | error = zap_remove_norm(ZTOZSB(zp)->z_os, dzp->z_id, | |
863 | dl->dl_name, mt, tx); | |
864 | } else { | |
865 | error = zap_remove(ZTOZSB(zp)->z_os, dzp->z_id, dl->dl_name, | |
866 | tx); | |
867 | } | |
868 | ||
869 | return (error); | |
870 | } | |
871 | ||
872 | /* | |
873 | * Unlink zp from dl, and mark zp for deletion if this was the last link. Can | |
874 | * fail if zp is a mount point (EBUSY) or a non-empty directory (ENOTEMPTY). | |
875 | * If 'unlinkedp' is NULL, we put unlinked znodes on the unlinked list. | |
876 | * If it's non-NULL, we use it to indicate whether the znode needs deletion, | |
877 | * and it's the caller's job to do it. | |
878 | */ | |
879 | int | |
880 | zfs_link_destroy(zfs_dirlock_t *dl, znode_t *zp, dmu_tx_t *tx, int flag, | |
881 | boolean_t *unlinkedp) | |
882 | { | |
883 | znode_t *dzp = dl->dl_dzp; | |
884 | zfsvfs_t *zfsvfs = ZTOZSB(dzp); | |
885 | int zp_is_dir = S_ISDIR(ZTOI(zp)->i_mode); | |
886 | boolean_t unlinked = B_FALSE; | |
887 | sa_bulk_attr_t bulk[5]; | |
888 | uint64_t mtime[2], ctime[2]; | |
889 | uint64_t links; | |
890 | int count = 0; | |
891 | int error; | |
892 | ||
893 | #ifdef HAVE_DNLC | |
894 | dnlc_remove(ZTOI(dzp), dl->dl_name); | |
895 | #endif /* HAVE_DNLC */ | |
896 | ||
897 | if (!(flag & ZRENAMING)) { | |
898 | mutex_enter(&zp->z_lock); | |
899 | ||
900 | if (zp_is_dir && !zfs_dirempty(zp)) { | |
901 | mutex_exit(&zp->z_lock); | |
902 | return (SET_ERROR(ENOTEMPTY)); | |
903 | } | |
904 | ||
905 | /* | |
906 | * If we get here, we are going to try to remove the object. | |
907 | * First try removing the name from the directory; if that | |
908 | * fails, return the error. | |
909 | */ | |
910 | error = zfs_dropname(dl, zp, dzp, tx, flag); | |
911 | if (error != 0) { | |
912 | mutex_exit(&zp->z_lock); | |
913 | return (error); | |
914 | } | |
915 | ||
916 | if (ZTOI(zp)->i_nlink <= zp_is_dir) { | |
917 | zfs_panic_recover("zfs: link count on %lu is %u, " | |
918 | "should be at least %u", zp->z_id, | |
919 | (int)ZTOI(zp)->i_nlink, zp_is_dir + 1); | |
920 | set_nlink(ZTOI(zp), zp_is_dir + 1); | |
921 | } | |
922 | drop_nlink(ZTOI(zp)); | |
923 | if (ZTOI(zp)->i_nlink == zp_is_dir) { | |
924 | zp->z_unlinked = B_TRUE; | |
925 | clear_nlink(ZTOI(zp)); | |
926 | unlinked = B_TRUE; | |
927 | } else { | |
928 | SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), | |
929 | NULL, &ctime, sizeof (ctime)); | |
930 | SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), | |
931 | NULL, &zp->z_pflags, sizeof (zp->z_pflags)); | |
932 | zfs_tstamp_update_setup(zp, STATE_CHANGED, mtime, | |
933 | ctime); | |
934 | } | |
935 | links = ZTOI(zp)->i_nlink; | |
936 | SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), | |
937 | NULL, &links, sizeof (links)); | |
938 | error = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx); | |
939 | count = 0; | |
940 | ASSERT(error == 0); | |
941 | mutex_exit(&zp->z_lock); | |
942 | } else { | |
943 | error = zfs_dropname(dl, zp, dzp, tx, flag); | |
944 | if (error != 0) | |
945 | return (error); | |
946 | } | |
947 | ||
948 | mutex_enter(&dzp->z_lock); | |
949 | dzp->z_size--; /* one dirent removed */ | |
950 | if (zp_is_dir) | |
951 | drop_nlink(ZTOI(dzp)); /* ".." link from zp */ | |
952 | links = ZTOI(dzp)->i_nlink; | |
953 | SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), | |
954 | NULL, &links, sizeof (links)); | |
955 | SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), | |
956 | NULL, &dzp->z_size, sizeof (dzp->z_size)); | |
957 | SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), | |
958 | NULL, ctime, sizeof (ctime)); | |
959 | SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), | |
960 | NULL, mtime, sizeof (mtime)); | |
961 | SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), | |
962 | NULL, &dzp->z_pflags, sizeof (dzp->z_pflags)); | |
963 | zfs_tstamp_update_setup(dzp, CONTENT_MODIFIED, mtime, ctime); | |
964 | error = sa_bulk_update(dzp->z_sa_hdl, bulk, count, tx); | |
965 | ASSERT(error == 0); | |
966 | mutex_exit(&dzp->z_lock); | |
967 | ||
968 | if (unlinkedp != NULL) | |
969 | *unlinkedp = unlinked; | |
970 | else if (unlinked) | |
971 | zfs_unlinked_add(zp, tx); | |
972 | ||
973 | return (0); | |
974 | } | |
975 | ||
976 | /* | |
977 | * Indicate whether the directory is empty. Works with or without z_lock | |
978 | * held, but can only be consider a hint in the latter case. Returns true | |
979 | * if only "." and ".." remain and there's no work in progress. | |
980 | * | |
981 | * The internal ZAP size, rather than zp->z_size, needs to be checked since | |
982 | * some consumers (Lustre) do not strictly maintain an accurate SA_ZPL_SIZE. | |
983 | */ | |
984 | boolean_t | |
985 | zfs_dirempty(znode_t *dzp) | |
986 | { | |
987 | zfsvfs_t *zfsvfs = ZTOZSB(dzp); | |
988 | uint64_t count; | |
989 | int error; | |
990 | ||
991 | if (dzp->z_dirlocks != NULL) | |
992 | return (B_FALSE); | |
993 | ||
994 | error = zap_count(zfsvfs->z_os, dzp->z_id, &count); | |
995 | if (error != 0 || count != 0) | |
996 | return (B_FALSE); | |
997 | ||
998 | return (B_TRUE); | |
999 | } | |
1000 | ||
1001 | int | |
1002 | zfs_make_xattrdir(znode_t *zp, vattr_t *vap, struct inode **xipp, cred_t *cr) | |
1003 | { | |
1004 | zfsvfs_t *zfsvfs = ZTOZSB(zp); | |
1005 | znode_t *xzp; | |
1006 | dmu_tx_t *tx; | |
1007 | int error; | |
1008 | zfs_acl_ids_t acl_ids; | |
1009 | boolean_t fuid_dirtied; | |
1010 | #ifdef DEBUG | |
1011 | uint64_t parent; | |
1012 | #endif | |
1013 | ||
1014 | *xipp = NULL; | |
1015 | ||
1016 | if ((error = zfs_zaccess(zp, ACE_WRITE_NAMED_ATTRS, 0, B_FALSE, cr))) | |
1017 | return (error); | |
1018 | ||
1019 | if ((error = zfs_acl_ids_create(zp, IS_XATTR, vap, cr, NULL, | |
1020 | &acl_ids)) != 0) | |
1021 | return (error); | |
1022 | if (zfs_acl_ids_overquota(zfsvfs, &acl_ids)) { | |
1023 | zfs_acl_ids_free(&acl_ids); | |
1024 | return (SET_ERROR(EDQUOT)); | |
1025 | } | |
1026 | ||
1027 | tx = dmu_tx_create(zfsvfs->z_os); | |
1028 | dmu_tx_hold_sa_create(tx, acl_ids.z_aclp->z_acl_bytes + | |
1029 | ZFS_SA_BASE_ATTR_SIZE); | |
1030 | dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE); | |
1031 | dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, FALSE, NULL); | |
1032 | fuid_dirtied = zfsvfs->z_fuid_dirty; | |
1033 | if (fuid_dirtied) | |
1034 | zfs_fuid_txhold(zfsvfs, tx); | |
1035 | error = dmu_tx_assign(tx, TXG_WAIT); | |
1036 | if (error) { | |
1037 | zfs_acl_ids_free(&acl_ids); | |
1038 | dmu_tx_abort(tx); | |
1039 | return (error); | |
1040 | } | |
1041 | zfs_mknode(zp, vap, tx, cr, IS_XATTR, &xzp, &acl_ids); | |
1042 | ||
1043 | if (fuid_dirtied) | |
1044 | zfs_fuid_sync(zfsvfs, tx); | |
1045 | ||
1046 | #ifdef DEBUG | |
1047 | error = sa_lookup(xzp->z_sa_hdl, SA_ZPL_PARENT(zfsvfs), | |
1048 | &parent, sizeof (parent)); | |
1049 | ASSERT(error == 0 && parent == zp->z_id); | |
1050 | #endif | |
1051 | ||
1052 | VERIFY(0 == sa_update(zp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs), &xzp->z_id, | |
1053 | sizeof (xzp->z_id), tx)); | |
1054 | ||
1055 | if (!zp->z_unlinked) | |
1056 | (void) zfs_log_create(zfsvfs->z_log, tx, TX_MKXATTR, zp, | |
1057 | xzp, "", NULL, acl_ids.z_fuidp, vap); | |
1058 | ||
1059 | zfs_acl_ids_free(&acl_ids); | |
1060 | dmu_tx_commit(tx); | |
1061 | ||
1062 | *xipp = ZTOI(xzp); | |
1063 | ||
1064 | return (0); | |
1065 | } | |
1066 | ||
1067 | /* | |
1068 | * Return a znode for the extended attribute directory for zp. | |
1069 | * ** If the directory does not already exist, it is created ** | |
1070 | * | |
1071 | * IN: zp - znode to obtain attribute directory from | |
1072 | * cr - credentials of caller | |
1073 | * flags - flags from the VOP_LOOKUP call | |
1074 | * | |
1075 | * OUT: xipp - pointer to extended attribute znode | |
1076 | * | |
1077 | * RETURN: 0 on success | |
1078 | * error number on failure | |
1079 | */ | |
1080 | int | |
1081 | zfs_get_xattrdir(znode_t *zp, struct inode **xipp, cred_t *cr, int flags) | |
1082 | { | |
1083 | zfsvfs_t *zfsvfs = ZTOZSB(zp); | |
1084 | znode_t *xzp; | |
1085 | zfs_dirlock_t *dl; | |
1086 | vattr_t va; | |
1087 | int error; | |
1088 | top: | |
1089 | error = zfs_dirent_lock(&dl, zp, "", &xzp, ZXATTR, NULL, NULL); | |
1090 | if (error) | |
1091 | return (error); | |
1092 | ||
1093 | if (xzp != NULL) { | |
1094 | *xipp = ZTOI(xzp); | |
1095 | zfs_dirent_unlock(dl); | |
1096 | return (0); | |
1097 | } | |
1098 | ||
1099 | if (!(flags & CREATE_XATTR_DIR)) { | |
1100 | zfs_dirent_unlock(dl); | |
1101 | return (SET_ERROR(ENOENT)); | |
1102 | } | |
1103 | ||
1104 | if (zfs_is_readonly(zfsvfs)) { | |
1105 | zfs_dirent_unlock(dl); | |
1106 | return (SET_ERROR(EROFS)); | |
1107 | } | |
1108 | ||
1109 | /* | |
1110 | * The ability to 'create' files in an attribute | |
1111 | * directory comes from the write_xattr permission on the base file. | |
1112 | * | |
1113 | * The ability to 'search' an attribute directory requires | |
1114 | * read_xattr permission on the base file. | |
1115 | * | |
1116 | * Once in a directory the ability to read/write attributes | |
1117 | * is controlled by the permissions on the attribute file. | |
1118 | */ | |
1119 | va.va_mask = ATTR_MODE | ATTR_UID | ATTR_GID; | |
1120 | va.va_mode = S_IFDIR | S_ISVTX | 0777; | |
1121 | zfs_fuid_map_ids(zp, cr, &va.va_uid, &va.va_gid); | |
1122 | ||
1123 | va.va_dentry = NULL; | |
1124 | error = zfs_make_xattrdir(zp, &va, xipp, cr); | |
1125 | zfs_dirent_unlock(dl); | |
1126 | ||
1127 | if (error == ERESTART) { | |
1128 | /* NB: we already did dmu_tx_wait() if necessary */ | |
1129 | goto top; | |
1130 | } | |
1131 | ||
1132 | return (error); | |
1133 | } | |
1134 | ||
1135 | /* | |
1136 | * Decide whether it is okay to remove within a sticky directory. | |
1137 | * | |
1138 | * In sticky directories, write access is not sufficient; | |
1139 | * you can remove entries from a directory only if: | |
1140 | * | |
1141 | * you own the directory, | |
1142 | * you own the entry, | |
1143 | * you have write access to the entry, | |
1144 | * or you are privileged (checked in secpolicy...). | |
1145 | * | |
1146 | * The function returns 0 if remove access is granted. | |
1147 | */ | |
1148 | int | |
1149 | zfs_sticky_remove_access(znode_t *zdp, znode_t *zp, cred_t *cr) | |
1150 | { | |
1151 | uid_t uid; | |
1152 | uid_t downer; | |
1153 | uid_t fowner; | |
1154 | zfsvfs_t *zfsvfs = ZTOZSB(zdp); | |
1155 | ||
1156 | if (zfsvfs->z_replay) | |
1157 | return (0); | |
1158 | ||
1159 | if ((zdp->z_mode & S_ISVTX) == 0) | |
1160 | return (0); | |
1161 | ||
1162 | downer = zfs_fuid_map_id(zfsvfs, KUID_TO_SUID(ZTOI(zdp)->i_uid), | |
1163 | cr, ZFS_OWNER); | |
1164 | fowner = zfs_fuid_map_id(zfsvfs, KUID_TO_SUID(ZTOI(zp)->i_uid), | |
1165 | cr, ZFS_OWNER); | |
1166 | ||
1167 | if ((uid = crgetuid(cr)) == downer || uid == fowner || | |
1168 | zfs_zaccess(zp, ACE_WRITE_DATA, 0, B_FALSE, cr) == 0) | |
1169 | return (0); | |
1170 | else | |
1171 | return (secpolicy_vnode_remove(cr)); | |
1172 | } |