1 /*-
2 * Copyright (c) 1999-2002 Robert N. M. Watson
3 * Copyright (c) 2002-2003 Networks Associates Technology, Inc.
4 * All rights reserved.
5 *
6 * This software was developed by Robert Watson for the TrustedBSD Project.
7 *
8 * This software was developed for the FreeBSD Project in part by Network
9 * Associates Laboratories, the Security Research Division of Network
10 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
11 * as part of the DARPA CHATS research program.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 */
35
36 /*
37 * Support for filesystem extended attribute: UFS-specific support functions.
38 */
39
40 #include <sys/cdefs.h>
41 __FBSDID("$FreeBSD$");
42
43 #include "opt_ufs.h"
44
45 #include <sys/param.h>
46 #include <sys/systm.h>
47 #include <sys/kernel.h>
48 #include <sys/namei.h>
49 #include <sys/malloc.h>
50 #include <sys/fcntl.h>
51 #include <sys/priv.h>
52 #include <sys/proc.h>
53 #include <sys/vnode.h>
54 #include <sys/mount.h>
55 #include <sys/lock.h>
56 #include <sys/dirent.h>
57 #include <sys/extattr.h>
58 #include <sys/sx.h>
59 #include <sys/sysctl.h>
60
61 #include <vm/uma.h>
62
63 #include <ufs/ufs/dir.h>
64 #include <ufs/ufs/extattr.h>
65 #include <ufs/ufs/quota.h>
66 #include <ufs/ufs/ufsmount.h>
67 #include <ufs/ufs/inode.h>
68 #include <ufs/ufs/ufs_extern.h>
69
70 #ifdef UFS_EXTATTR
71
72 FEATURE(ufs_extattr, "ufs extended attribute support");
73
74 static MALLOC_DEFINE(M_UFS_EXTATTR, "ufs_extattr", "ufs extended attribute");
75
76 static int ufs_extattr_sync = 0;
77 SYSCTL_INT(_debug, OID_AUTO, ufs_extattr_sync, CTLFLAG_RW, &ufs_extattr_sync,
78 0, "");
79
80 static int ufs_extattr_valid_attrname(int attrnamespace,
81 const char *attrname);
82 static int ufs_extattr_enable_with_open(struct ufsmount *ump,
83 struct vnode *vp, int attrnamespace, const char *attrname,
84 struct thread *td);
85 static int ufs_extattr_enable(struct ufsmount *ump, int attrnamespace,
86 const char *attrname, struct vnode *backing_vnode,
87 struct thread *td);
88 static int ufs_extattr_disable(struct ufsmount *ump, int attrnamespace,
89 const char *attrname, struct thread *td);
90 static int ufs_extattr_get(struct vnode *vp, int attrnamespace,
91 const char *name, struct uio *uio, size_t *size,
92 struct ucred *cred, struct thread *td);
93 static int ufs_extattr_set(struct vnode *vp, int attrnamespace,
94 const char *name, struct uio *uio, struct ucred *cred,
95 struct thread *td);
96 static int ufs_extattr_rm(struct vnode *vp, int attrnamespace,
97 const char *name, struct ucred *cred, struct thread *td);
98 #ifdef UFS_EXTATTR_AUTOSTART
99 static int ufs_extattr_autostart_locked(struct mount *mp,
100 struct thread *td);
101 #endif
102 static int ufs_extattr_start_locked(struct ufsmount *ump,
103 struct thread *td);
104
105 /*
106 * Per-FS attribute lock protecting attribute operations.
107 *
108 * XXXRW: Perhaps something more fine-grained would be appropriate, but at
109 * the end of the day we're going to contend on the vnode lock for the
110 * backing file anyway.
111 */
112 static void
ufs_extattr_uepm_lock(struct ufsmount * ump)113 ufs_extattr_uepm_lock(struct ufsmount *ump)
114 {
115
116 sx_xlock(&ump->um_extattr.uepm_lock);
117 }
118
119 static void
ufs_extattr_uepm_unlock(struct ufsmount * ump)120 ufs_extattr_uepm_unlock(struct ufsmount *ump)
121 {
122
123 sx_xunlock(&ump->um_extattr.uepm_lock);
124 }
125
126 /*-
127 * Determine whether the name passed is a valid name for an actual
128 * attribute.
129 *
130 * Invalid currently consists of:
131 * NULL pointer for attrname
132 * zero-length attrname (used to retrieve application attribute list)
133 */
134 static int
ufs_extattr_valid_attrname(int attrnamespace,const char * attrname)135 ufs_extattr_valid_attrname(int attrnamespace, const char *attrname)
136 {
137
138 if (attrname == NULL)
139 return (0);
140 if (strlen(attrname) == 0)
141 return (0);
142 return (1);
143 }
144
145 /*
146 * Locate an attribute given a name and mountpoint.
147 * Must be holding uepm lock for the mount point.
148 */
149 static struct ufs_extattr_list_entry *
ufs_extattr_find_attr(struct ufsmount * ump,int attrnamespace,const char * attrname)150 ufs_extattr_find_attr(struct ufsmount *ump, int attrnamespace,
151 const char *attrname)
152 {
153 struct ufs_extattr_list_entry *search_attribute;
154
155 sx_assert(&ump->um_extattr.uepm_lock, SA_XLOCKED);
156
157 for (search_attribute = LIST_FIRST(&ump->um_extattr.uepm_list);
158 search_attribute != NULL;
159 search_attribute = LIST_NEXT(search_attribute, uele_entries)) {
160 if (!(strncmp(attrname, search_attribute->uele_attrname,
161 UFS_EXTATTR_MAXEXTATTRNAME)) &&
162 (attrnamespace == search_attribute->uele_attrnamespace)) {
163 return (search_attribute);
164 }
165 }
166
167 return (0);
168 }
169
170 /*
171 * Initialize per-FS structures supporting extended attributes. Do not
172 * start extended attributes yet.
173 */
174 void
ufs_extattr_uepm_init(struct ufs_extattr_per_mount * uepm)175 ufs_extattr_uepm_init(struct ufs_extattr_per_mount *uepm)
176 {
177
178 uepm->uepm_flags = 0;
179 LIST_INIT(&uepm->uepm_list);
180 sx_init(&uepm->uepm_lock, "ufs_extattr_sx");
181 uepm->uepm_flags |= UFS_EXTATTR_UEPM_INITIALIZED;
182 }
183
184 /*
185 * Destroy per-FS structures supporting extended attributes. Assumes
186 * that EAs have already been stopped, and will panic if not.
187 */
188 void
ufs_extattr_uepm_destroy(struct ufs_extattr_per_mount * uepm)189 ufs_extattr_uepm_destroy(struct ufs_extattr_per_mount *uepm)
190 {
191
192 if (!(uepm->uepm_flags & UFS_EXTATTR_UEPM_INITIALIZED))
193 panic("ufs_extattr_uepm_destroy: not initialized");
194
195 if ((uepm->uepm_flags & UFS_EXTATTR_UEPM_STARTED))
196 panic("ufs_extattr_uepm_destroy: called while still started");
197
198 /*
199 * It's not clear that either order for the next two lines is
200 * ideal, and it should never be a problem if this is only called
201 * during unmount, and with vfs_busy().
202 */
203 uepm->uepm_flags &= ~UFS_EXTATTR_UEPM_INITIALIZED;
204 sx_destroy(&uepm->uepm_lock);
205 }
206
207 /*
208 * Start extended attribute support on an FS.
209 */
210 int
ufs_extattr_start(struct mount * mp,struct thread * td)211 ufs_extattr_start(struct mount *mp, struct thread *td)
212 {
213 struct ufsmount *ump;
214 int error = 0;
215
216 ump = VFSTOUFS(mp);
217
218 ufs_extattr_uepm_lock(ump);
219 error = ufs_extattr_start_locked(ump, td);
220 ufs_extattr_uepm_unlock(ump);
221 return (error);
222 }
223
224 static int
ufs_extattr_start_locked(struct ufsmount * ump,struct thread * td)225 ufs_extattr_start_locked(struct ufsmount *ump, struct thread *td)
226 {
227 if (!(ump->um_extattr.uepm_flags & UFS_EXTATTR_UEPM_INITIALIZED))
228 return (EOPNOTSUPP);
229 if (ump->um_extattr.uepm_flags & UFS_EXTATTR_UEPM_STARTED)
230 return (EBUSY);
231
232 ump->um_extattr.uepm_flags |= UFS_EXTATTR_UEPM_STARTED;
233 ump->um_extattr.uepm_ucred = crhold(td->td_ucred);
234 return (0);
235 }
236
237 #ifdef UFS_EXTATTR_AUTOSTART
238 /*
239 * Helper routine: given a locked parent directory and filename, return
240 * the locked vnode of the inode associated with the name. Will not
241 * follow symlinks, may return any type of vnode. Lock on parent will
242 * be released even in the event of a failure. In the event that the
243 * target is the parent (i.e., "."), there will be two references and
244 * one lock, requiring the caller to possibly special-case.
245 */
246 #define UE_GETDIR_LOCKPARENT 1
247 #define UE_GETDIR_LOCKPARENT_DONT 2
248 static int
ufs_extattr_lookup(struct vnode * start_dvp,int lockparent,char * dirname,struct vnode ** vp,struct thread * td)249 ufs_extattr_lookup(struct vnode *start_dvp, int lockparent, char *dirname,
250 struct vnode **vp, struct thread *td)
251 {
252 struct vop_cachedlookup_args vargs;
253 struct componentname cnp;
254 struct vnode *target_vp;
255 int error;
256
257 bzero(&cnp, sizeof(cnp));
258 cnp.cn_nameiop = LOOKUP;
259 cnp.cn_flags = ISLASTCN;
260 if (lockparent == UE_GETDIR_LOCKPARENT)
261 cnp.cn_flags |= LOCKPARENT;
262 cnp.cn_lkflags = LK_EXCLUSIVE;
263 cnp.cn_thread = td;
264 cnp.cn_cred = td->td_ucred;
265 cnp.cn_pnbuf = uma_zalloc(namei_zone, M_WAITOK);
266 cnp.cn_nameptr = cnp.cn_pnbuf;
267 error = copystr(dirname, cnp.cn_pnbuf, MAXPATHLEN,
268 (size_t *) &cnp.cn_namelen);
269 if (error) {
270 if (lockparent == UE_GETDIR_LOCKPARENT_DONT) {
271 VOP_UNLOCK(start_dvp, 0);
272 }
273 uma_zfree(namei_zone, cnp.cn_pnbuf);
274 printf("ufs_extattr_lookup: copystr failed\n");
275 return (error);
276 }
277 cnp.cn_namelen--; /* trim nul termination */
278 vargs.a_gen.a_desc = NULL;
279 vargs.a_dvp = start_dvp;
280 vargs.a_vpp = &target_vp;
281 vargs.a_cnp = &cnp;
282 error = ufs_lookup(&vargs);
283 uma_zfree(namei_zone, cnp.cn_pnbuf);
284 if (error) {
285 /*
286 * Error condition, may have to release the lock on the parent
287 * if ufs_lookup() didn't.
288 */
289 if (lockparent == UE_GETDIR_LOCKPARENT_DONT)
290 VOP_UNLOCK(start_dvp, 0);
291
292 /*
293 * Check that ufs_lookup() didn't release the lock when we
294 * didn't want it to.
295 */
296 if (lockparent == UE_GETDIR_LOCKPARENT)
297 ASSERT_VOP_LOCKED(start_dvp, "ufs_extattr_lookup");
298
299 return (error);
300 }
301 /*
302 if (target_vp == start_dvp)
303 panic("ufs_extattr_lookup: target_vp == start_dvp");
304 */
305
306 if (target_vp != start_dvp && lockparent == UE_GETDIR_LOCKPARENT_DONT)
307 VOP_UNLOCK(start_dvp, 0);
308
309 if (lockparent == UE_GETDIR_LOCKPARENT)
310 ASSERT_VOP_LOCKED(start_dvp, "ufs_extattr_lookup");
311
312 /* printf("ufs_extattr_lookup: success\n"); */
313 *vp = target_vp;
314 return (0);
315 }
316 #endif /* !UFS_EXTATTR_AUTOSTART */
317
318 /*
319 * Enable an EA using the passed filesystem, backing vnode, attribute name,
320 * namespace, and proc. Will perform a VOP_OPEN() on the vp, so expects vp
321 * to be locked when passed in. The vnode will be returned unlocked,
322 * regardless of success/failure of the function. As a result, the caller
323 * will always need to vrele(), but not vput().
324 */
325 static int
ufs_extattr_enable_with_open(struct ufsmount * ump,struct vnode * vp,int attrnamespace,const char * attrname,struct thread * td)326 ufs_extattr_enable_with_open(struct ufsmount *ump, struct vnode *vp,
327 int attrnamespace, const char *attrname, struct thread *td)
328 {
329 int error;
330
331 error = VOP_OPEN(vp, FREAD|FWRITE, td->td_ucred, td, NULL);
332 if (error) {
333 printf("ufs_extattr_enable_with_open.VOP_OPEN(): failed "
334 "with %d\n", error);
335 VOP_UNLOCK(vp, 0);
336 return (error);
337 }
338
339 VOP_ADD_WRITECOUNT(vp, 1);
340 CTR3(KTR_VFS, "%s: vp %p v_writecount increased to %d", __func__, vp,
341 vp->v_writecount);
342
343 vref(vp);
344
345 VOP_UNLOCK(vp, 0);
346
347 error = ufs_extattr_enable(ump, attrnamespace, attrname, vp, td);
348 if (error != 0)
349 vn_close(vp, FREAD|FWRITE, td->td_ucred, td);
350 return (error);
351 }
352
353 #ifdef UFS_EXTATTR_AUTOSTART
354 /*
355 * Given a locked directory vnode, iterate over the names in the directory
356 * and use ufs_extattr_lookup() to retrieve locked vnodes of potential
357 * attribute files. Then invoke ufs_extattr_enable_with_open() on each
358 * to attempt to start the attribute. Leaves the directory locked on
359 * exit.
360 */
361 static int
ufs_extattr_iterate_directory(struct ufsmount * ump,struct vnode * dvp,int attrnamespace,struct thread * td)362 ufs_extattr_iterate_directory(struct ufsmount *ump, struct vnode *dvp,
363 int attrnamespace, struct thread *td)
364 {
365 struct vop_readdir_args vargs;
366 struct dirent *dp, *edp;
367 struct vnode *attr_vp;
368 struct uio auio;
369 struct iovec aiov;
370 char *dirbuf;
371 int error, eofflag = 0;
372
373 if (dvp->v_type != VDIR)
374 return (ENOTDIR);
375
376 dirbuf = malloc(DIRBLKSIZ, M_TEMP, M_WAITOK);
377
378 auio.uio_iov = &aiov;
379 auio.uio_iovcnt = 1;
380 auio.uio_rw = UIO_READ;
381 auio.uio_segflg = UIO_SYSSPACE;
382 auio.uio_td = td;
383 auio.uio_offset = 0;
384
385 vargs.a_gen.a_desc = NULL;
386 vargs.a_vp = dvp;
387 vargs.a_uio = &auio;
388 vargs.a_cred = td->td_ucred;
389 vargs.a_eofflag = &eofflag;
390 vargs.a_ncookies = NULL;
391 vargs.a_cookies = NULL;
392
393 while (!eofflag) {
394 auio.uio_resid = DIRBLKSIZ;
395 aiov.iov_base = dirbuf;
396 aiov.iov_len = DIRBLKSIZ;
397 error = ufs_readdir(&vargs);
398 if (error) {
399 printf("ufs_extattr_iterate_directory: ufs_readdir "
400 "%d\n", error);
401 return (error);
402 }
403
404 edp = (struct dirent *)&dirbuf[DIRBLKSIZ - auio.uio_resid];
405 for (dp = (struct dirent *)dirbuf; dp < edp; ) {
406 if (dp->d_reclen == 0)
407 break;
408 error = ufs_extattr_lookup(dvp, UE_GETDIR_LOCKPARENT,
409 dp->d_name, &attr_vp, td);
410 if (error) {
411 printf("ufs_extattr_iterate_directory: lookup "
412 "%s %d\n", dp->d_name, error);
413 } else if (attr_vp == dvp) {
414 vrele(attr_vp);
415 } else if (attr_vp->v_type != VREG) {
416 vput(attr_vp);
417 } else {
418 error = ufs_extattr_enable_with_open(ump,
419 attr_vp, attrnamespace, dp->d_name, td);
420 vrele(attr_vp);
421 if (error) {
422 printf("ufs_extattr_iterate_directory: "
423 "enable %s %d\n", dp->d_name,
424 error);
425 } else if (bootverbose) {
426 printf("UFS autostarted EA %s\n",
427 dp->d_name);
428 }
429 }
430 dp = (struct dirent *) ((char *)dp + dp->d_reclen);
431 if (dp >= edp)
432 break;
433 }
434 }
435 free(dirbuf, M_TEMP);
436
437 return (0);
438 }
439
440 /*
441 * Auto-start of extended attributes, to be executed (optionally) at
442 * mount-time.
443 */
444 int
ufs_extattr_autostart(struct mount * mp,struct thread * td)445 ufs_extattr_autostart(struct mount *mp, struct thread *td)
446 {
447 struct ufsmount *ump;
448 int error;
449
450 ump = VFSTOUFS(mp);
451 ufs_extattr_uepm_lock(ump);
452 error = ufs_extattr_autostart_locked(mp, td);
453 ufs_extattr_uepm_unlock(ump);
454 return (error);
455 }
456
457 static int
ufs_extattr_autostart_locked(struct mount * mp,struct thread * td)458 ufs_extattr_autostart_locked(struct mount *mp, struct thread *td)
459 {
460 struct vnode *rvp, *attr_dvp, *attr_system_dvp, *attr_user_dvp;
461 struct ufsmount *ump = VFSTOUFS(mp);
462 int error;
463
464 /*
465 * UFS_EXTATTR applies only to UFS1, as UFS2 uses native extended
466 * attributes, so don't autostart.
467 */
468 if (ump->um_fstype != UFS1)
469 return (0);
470
471 /*
472 * Does UFS_EXTATTR_FSROOTSUBDIR exist off the filesystem root?
473 * If so, automatically start EA's.
474 */
475 error = VFS_ROOT(mp, LK_EXCLUSIVE, &rvp);
476 if (error) {
477 printf("ufs_extattr_autostart.VFS_ROOT() returned %d\n",
478 error);
479 return (error);
480 }
481
482 error = ufs_extattr_lookup(rvp, UE_GETDIR_LOCKPARENT_DONT,
483 UFS_EXTATTR_FSROOTSUBDIR, &attr_dvp, td);
484 if (error) {
485 /* rvp ref'd but now unlocked */
486 vrele(rvp);
487 return (error);
488 }
489 if (rvp == attr_dvp) {
490 /* Should never happen. */
491 vput(rvp);
492 vrele(attr_dvp);
493 return (EINVAL);
494 }
495 vrele(rvp);
496
497 if (attr_dvp->v_type != VDIR) {
498 printf("ufs_extattr_autostart: %s != VDIR\n",
499 UFS_EXTATTR_FSROOTSUBDIR);
500 goto return_vput_attr_dvp;
501 }
502
503 error = ufs_extattr_start_locked(ump, td);
504 if (error) {
505 printf("ufs_extattr_autostart: ufs_extattr_start failed (%d)\n",
506 error);
507 goto return_vput_attr_dvp;
508 }
509
510 /*
511 * Look for two subdirectories: UFS_EXTATTR_SUBDIR_SYSTEM,
512 * UFS_EXTATTR_SUBDIR_USER. For each, iterate over the sub-directory,
513 * and start with appropriate type. Failures in either don't
514 * result in an over-all failure. attr_dvp is left locked to
515 * be cleaned up on exit.
516 */
517 error = ufs_extattr_lookup(attr_dvp, UE_GETDIR_LOCKPARENT,
518 UFS_EXTATTR_SUBDIR_SYSTEM, &attr_system_dvp, td);
519 if (!error) {
520 error = ufs_extattr_iterate_directory(VFSTOUFS(mp),
521 attr_system_dvp, EXTATTR_NAMESPACE_SYSTEM, td);
522 if (error)
523 printf("ufs_extattr_iterate_directory returned %d\n",
524 error);
525 vput(attr_system_dvp);
526 }
527
528 error = ufs_extattr_lookup(attr_dvp, UE_GETDIR_LOCKPARENT,
529 UFS_EXTATTR_SUBDIR_USER, &attr_user_dvp, td);
530 if (!error) {
531 error = ufs_extattr_iterate_directory(VFSTOUFS(mp),
532 attr_user_dvp, EXTATTR_NAMESPACE_USER, td);
533 if (error)
534 printf("ufs_extattr_iterate_directory returned %d\n",
535 error);
536 vput(attr_user_dvp);
537 }
538
539 /* Mask startup failures in sub-directories. */
540 error = 0;
541
542 return_vput_attr_dvp:
543 vput(attr_dvp);
544
545 return (error);
546 }
547 #endif /* !UFS_EXTATTR_AUTOSTART */
548
549 /*
550 * Stop extended attribute support on an FS.
551 */
552 int
ufs_extattr_stop(struct mount * mp,struct thread * td)553 ufs_extattr_stop(struct mount *mp, struct thread *td)
554 {
555 struct ufs_extattr_list_entry *uele;
556 struct ufsmount *ump = VFSTOUFS(mp);
557 int error = 0;
558
559 ufs_extattr_uepm_lock(ump);
560
561 if (!(ump->um_extattr.uepm_flags & UFS_EXTATTR_UEPM_STARTED)) {
562 error = EOPNOTSUPP;
563 goto unlock;
564 }
565
566 while ((uele = LIST_FIRST(&ump->um_extattr.uepm_list)) != NULL) {
567 ufs_extattr_disable(ump, uele->uele_attrnamespace,
568 uele->uele_attrname, td);
569 }
570
571 ump->um_extattr.uepm_flags &= ~UFS_EXTATTR_UEPM_STARTED;
572
573 crfree(ump->um_extattr.uepm_ucred);
574 ump->um_extattr.uepm_ucred = NULL;
575
576 unlock:
577 ufs_extattr_uepm_unlock(ump);
578
579 return (error);
580 }
581
582 /*
583 * Enable a named attribute on the specified filesystem; provide an
584 * unlocked backing vnode to hold the attribute data.
585 */
586 static int
ufs_extattr_enable(struct ufsmount * ump,int attrnamespace,const char * attrname,struct vnode * backing_vnode,struct thread * td)587 ufs_extattr_enable(struct ufsmount *ump, int attrnamespace,
588 const char *attrname, struct vnode *backing_vnode, struct thread *td)
589 {
590 struct ufs_extattr_list_entry *attribute;
591 struct iovec aiov;
592 struct uio auio;
593 int error = 0;
594
595 if (!ufs_extattr_valid_attrname(attrnamespace, attrname))
596 return (EINVAL);
597 if (backing_vnode->v_type != VREG)
598 return (EINVAL);
599
600 attribute = malloc(sizeof(struct ufs_extattr_list_entry),
601 M_UFS_EXTATTR, M_WAITOK);
602
603 if (!(ump->um_extattr.uepm_flags & UFS_EXTATTR_UEPM_STARTED)) {
604 error = EOPNOTSUPP;
605 goto free_exit;
606 }
607
608 if (ufs_extattr_find_attr(ump, attrnamespace, attrname)) {
609 error = EEXIST;
610 goto free_exit;
611 }
612
613 strncpy(attribute->uele_attrname, attrname,
614 UFS_EXTATTR_MAXEXTATTRNAME);
615 attribute->uele_attrnamespace = attrnamespace;
616 bzero(&attribute->uele_fileheader,
617 sizeof(struct ufs_extattr_fileheader));
618
619 attribute->uele_backing_vnode = backing_vnode;
620
621 auio.uio_iov = &aiov;
622 auio.uio_iovcnt = 1;
623 aiov.iov_base = (caddr_t) &attribute->uele_fileheader;
624 aiov.iov_len = sizeof(struct ufs_extattr_fileheader);
625 auio.uio_resid = sizeof(struct ufs_extattr_fileheader);
626 auio.uio_offset = (off_t) 0;
627 auio.uio_segflg = UIO_SYSSPACE;
628 auio.uio_rw = UIO_READ;
629 auio.uio_td = td;
630
631 vn_lock(backing_vnode, LK_SHARED | LK_RETRY);
632 error = VOP_READ(backing_vnode, &auio, IO_NODELOCKED,
633 ump->um_extattr.uepm_ucred);
634
635 if (error)
636 goto unlock_free_exit;
637
638 if (auio.uio_resid != 0) {
639 printf("ufs_extattr_enable: malformed attribute header\n");
640 error = EINVAL;
641 goto unlock_free_exit;
642 }
643
644 if (attribute->uele_fileheader.uef_magic != UFS_EXTATTR_MAGIC) {
645 printf("ufs_extattr_enable: invalid attribute header magic\n");
646 error = EINVAL;
647 goto unlock_free_exit;
648 }
649
650 if (attribute->uele_fileheader.uef_version != UFS_EXTATTR_VERSION) {
651 printf("ufs_extattr_enable: incorrect attribute header "
652 "version\n");
653 error = EINVAL;
654 goto unlock_free_exit;
655 }
656
657 ASSERT_VOP_LOCKED(backing_vnode, "ufs_extattr_enable");
658 LIST_INSERT_HEAD(&ump->um_extattr.uepm_list, attribute,
659 uele_entries);
660
661 VOP_UNLOCK(backing_vnode, 0);
662 return (0);
663
664 unlock_free_exit:
665 VOP_UNLOCK(backing_vnode, 0);
666
667 free_exit:
668 free(attribute, M_UFS_EXTATTR);
669 return (error);
670 }
671
672 /*
673 * Disable extended attribute support on an FS.
674 */
675 static int
ufs_extattr_disable(struct ufsmount * ump,int attrnamespace,const char * attrname,struct thread * td)676 ufs_extattr_disable(struct ufsmount *ump, int attrnamespace,
677 const char *attrname, struct thread *td)
678 {
679 struct ufs_extattr_list_entry *uele;
680 int error = 0;
681
682 if (!ufs_extattr_valid_attrname(attrnamespace, attrname))
683 return (EINVAL);
684
685 uele = ufs_extattr_find_attr(ump, attrnamespace, attrname);
686 if (!uele)
687 return (ENOATTR);
688
689 LIST_REMOVE(uele, uele_entries);
690
691 vn_lock(uele->uele_backing_vnode, LK_SHARED | LK_RETRY);
692 ASSERT_VOP_LOCKED(uele->uele_backing_vnode, "ufs_extattr_disable");
693 VOP_UNLOCK(uele->uele_backing_vnode, 0);
694 error = vn_close(uele->uele_backing_vnode, FREAD|FWRITE,
695 td->td_ucred, td);
696
697 free(uele, M_UFS_EXTATTR);
698
699 return (error);
700 }
701
702 /*
703 * VFS call to manage extended attributes in UFS. If filename_vp is
704 * non-NULL, it must be passed in locked, and regardless of errors in
705 * processing, will be unlocked.
706 */
707 int
ufs_extattrctl(struct mount * mp,int cmd,struct vnode * filename_vp,int attrnamespace,const char * attrname)708 ufs_extattrctl(struct mount *mp, int cmd, struct vnode *filename_vp,
709 int attrnamespace, const char *attrname)
710 {
711 struct ufsmount *ump = VFSTOUFS(mp);
712 struct thread *td = curthread;
713 int error;
714
715 /*
716 * Processes with privilege, but in jail, are not allowed to
717 * configure extended attributes.
718 */
719 error = priv_check(td, PRIV_UFS_EXTATTRCTL);
720 if (error) {
721 if (filename_vp != NULL)
722 VOP_UNLOCK(filename_vp, 0);
723 return (error);
724 }
725
726 /*
727 * We only allow extattrctl(2) on UFS1 file systems, as UFS2 uses
728 * native extended attributes.
729 */
730 if (ump->um_fstype != UFS1) {
731 if (filename_vp != NULL)
732 VOP_UNLOCK(filename_vp, 0);
733 return (EOPNOTSUPP);
734 }
735
736 switch(cmd) {
737 case UFS_EXTATTR_CMD_START:
738 if (filename_vp != NULL) {
739 VOP_UNLOCK(filename_vp, 0);
740 return (EINVAL);
741 }
742 if (attrname != NULL)
743 return (EINVAL);
744
745 error = ufs_extattr_start(mp, td);
746
747 return (error);
748
749 case UFS_EXTATTR_CMD_STOP:
750 if (filename_vp != NULL) {
751 VOP_UNLOCK(filename_vp, 0);
752 return (EINVAL);
753 }
754 if (attrname != NULL)
755 return (EINVAL);
756
757 error = ufs_extattr_stop(mp, td);
758
759 return (error);
760
761 case UFS_EXTATTR_CMD_ENABLE:
762
763 if (filename_vp == NULL)
764 return (EINVAL);
765 if (attrname == NULL) {
766 VOP_UNLOCK(filename_vp, 0);
767 return (EINVAL);
768 }
769
770 /*
771 * ufs_extattr_enable_with_open() will always unlock the
772 * vnode, regardless of failure.
773 */
774 ufs_extattr_uepm_lock(ump);
775 error = ufs_extattr_enable_with_open(ump, filename_vp,
776 attrnamespace, attrname, td);
777 ufs_extattr_uepm_unlock(ump);
778
779 return (error);
780
781 case UFS_EXTATTR_CMD_DISABLE:
782
783 if (filename_vp != NULL) {
784 VOP_UNLOCK(filename_vp, 0);
785 return (EINVAL);
786 }
787 if (attrname == NULL)
788 return (EINVAL);
789
790 ufs_extattr_uepm_lock(ump);
791 error = ufs_extattr_disable(ump, attrnamespace, attrname,
792 td);
793 ufs_extattr_uepm_unlock(ump);
794
795 return (error);
796
797 default:
798 return (EINVAL);
799 }
800 }
801
802 /*
803 * Vnode operating to retrieve a named extended attribute.
804 */
805 int
ufs_getextattr(struct vop_getextattr_args * ap)806 ufs_getextattr(struct vop_getextattr_args *ap)
807 /*
808 vop_getextattr {
809 IN struct vnode *a_vp;
810 IN int a_attrnamespace;
811 IN const char *a_name;
812 INOUT struct uio *a_uio;
813 OUT size_t *a_size;
814 IN struct ucred *a_cred;
815 IN struct thread *a_td;
816 };
817 */
818 {
819 struct mount *mp = ap->a_vp->v_mount;
820 struct ufsmount *ump = VFSTOUFS(mp);
821 int error;
822
823 ufs_extattr_uepm_lock(ump);
824
825 error = ufs_extattr_get(ap->a_vp, ap->a_attrnamespace, ap->a_name,
826 ap->a_uio, ap->a_size, ap->a_cred, ap->a_td);
827
828 ufs_extattr_uepm_unlock(ump);
829
830 return (error);
831 }
832
833 /*
834 * Real work associated with retrieving a named attribute--assumes that
835 * the attribute lock has already been grabbed.
836 */
837 static int
ufs_extattr_get(struct vnode * vp,int attrnamespace,const char * name,struct uio * uio,size_t * size,struct ucred * cred,struct thread * td)838 ufs_extattr_get(struct vnode *vp, int attrnamespace, const char *name,
839 struct uio *uio, size_t *size, struct ucred *cred, struct thread *td)
840 {
841 struct ufs_extattr_list_entry *attribute;
842 struct ufs_extattr_header ueh;
843 struct iovec local_aiov;
844 struct uio local_aio;
845 struct mount *mp = vp->v_mount;
846 struct ufsmount *ump = VFSTOUFS(mp);
847 struct inode *ip = VTOI(vp);
848 off_t base_offset;
849 size_t len, old_len;
850 int error = 0;
851
852 if (!(ump->um_extattr.uepm_flags & UFS_EXTATTR_UEPM_STARTED))
853 return (EOPNOTSUPP);
854
855 if (strlen(name) == 0)
856 return (EINVAL);
857
858 error = extattr_check_cred(vp, attrnamespace, cred, td, VREAD);
859 if (error)
860 return (error);
861
862 attribute = ufs_extattr_find_attr(ump, attrnamespace, name);
863 if (!attribute)
864 return (ENOATTR);
865
866 /*
867 * Allow only offsets of zero to encourage the read/replace
868 * extended attribute semantic. Otherwise we can't guarantee
869 * atomicity, as we don't provide locks for extended attributes.
870 */
871 if (uio != NULL && uio->uio_offset != 0)
872 return (ENXIO);
873
874 /*
875 * Find base offset of header in file based on file header size, and
876 * data header size + maximum data size, indexed by inode number.
877 */
878 base_offset = sizeof(struct ufs_extattr_fileheader) +
879 ip->i_number * (sizeof(struct ufs_extattr_header) +
880 attribute->uele_fileheader.uef_size);
881
882 /*
883 * Read in the data header to see if the data is defined, and if so
884 * how much.
885 */
886 bzero(&ueh, sizeof(struct ufs_extattr_header));
887 local_aiov.iov_base = (caddr_t) &ueh;
888 local_aiov.iov_len = sizeof(struct ufs_extattr_header);
889 local_aio.uio_iov = &local_aiov;
890 local_aio.uio_iovcnt = 1;
891 local_aio.uio_rw = UIO_READ;
892 local_aio.uio_segflg = UIO_SYSSPACE;
893 local_aio.uio_td = td;
894 local_aio.uio_offset = base_offset;
895 local_aio.uio_resid = sizeof(struct ufs_extattr_header);
896
897 /*
898 * Acquire locks.
899 *
900 * Don't need to get a lock on the backing file if the getattr is
901 * being applied to the backing file, as the lock is already held.
902 */
903 if (attribute->uele_backing_vnode != vp)
904 vn_lock(attribute->uele_backing_vnode, LK_SHARED | LK_RETRY);
905
906 error = VOP_READ(attribute->uele_backing_vnode, &local_aio,
907 IO_NODELOCKED, ump->um_extattr.uepm_ucred);
908 if (error)
909 goto vopunlock_exit;
910
911 /* Defined? */
912 if ((ueh.ueh_flags & UFS_EXTATTR_ATTR_FLAG_INUSE) == 0) {
913 error = ENOATTR;
914 goto vopunlock_exit;
915 }
916
917 /* Valid for the current inode generation? */
918 if (ueh.ueh_i_gen != ip->i_gen) {
919 /*
920 * The inode itself has a different generation number
921 * than the attribute data. For now, the best solution
922 * is to coerce this to undefined, and let it get cleaned
923 * up by the next write or extattrctl clean.
924 */
925 printf("ufs_extattr_get (%s): inode number inconsistency (%d, %ju)\n",
926 mp->mnt_stat.f_mntonname, ueh.ueh_i_gen, (uintmax_t)ip->i_gen);
927 error = ENOATTR;
928 goto vopunlock_exit;
929 }
930
931 /* Local size consistency check. */
932 if (ueh.ueh_len > attribute->uele_fileheader.uef_size) {
933 error = ENXIO;
934 goto vopunlock_exit;
935 }
936
937 /* Return full data size if caller requested it. */
938 if (size != NULL)
939 *size = ueh.ueh_len;
940
941 /* Return data if the caller requested it. */
942 if (uio != NULL) {
943 /* Allow for offset into the attribute data. */
944 uio->uio_offset = base_offset + sizeof(struct
945 ufs_extattr_header);
946
947 /*
948 * Figure out maximum to transfer -- use buffer size and
949 * local data limit.
950 */
951 len = MIN(uio->uio_resid, ueh.ueh_len);
952 old_len = uio->uio_resid;
953 uio->uio_resid = len;
954
955 error = VOP_READ(attribute->uele_backing_vnode, uio,
956 IO_NODELOCKED, ump->um_extattr.uepm_ucred);
957 if (error)
958 goto vopunlock_exit;
959
960 uio->uio_resid = old_len - (len - uio->uio_resid);
961 }
962
963 vopunlock_exit:
964
965 if (uio != NULL)
966 uio->uio_offset = 0;
967
968 if (attribute->uele_backing_vnode != vp)
969 VOP_UNLOCK(attribute->uele_backing_vnode, 0);
970
971 return (error);
972 }
973
974 /*
975 * Vnode operation to remove a named attribute.
976 */
977 int
ufs_deleteextattr(struct vop_deleteextattr_args * ap)978 ufs_deleteextattr(struct vop_deleteextattr_args *ap)
979 /*
980 vop_deleteextattr {
981 IN struct vnode *a_vp;
982 IN int a_attrnamespace;
983 IN const char *a_name;
984 IN struct ucred *a_cred;
985 IN struct thread *a_td;
986 };
987 */
988 {
989 struct mount *mp = ap->a_vp->v_mount;
990 struct ufsmount *ump = VFSTOUFS(mp);
991 int error;
992
993 ufs_extattr_uepm_lock(ump);
994
995 error = ufs_extattr_rm(ap->a_vp, ap->a_attrnamespace, ap->a_name,
996 ap->a_cred, ap->a_td);
997
998
999 ufs_extattr_uepm_unlock(ump);
1000
1001 return (error);
1002 }
1003
1004 /*
1005 * Vnode operation to set a named attribute.
1006 */
1007 int
ufs_setextattr(struct vop_setextattr_args * ap)1008 ufs_setextattr(struct vop_setextattr_args *ap)
1009 /*
1010 vop_setextattr {
1011 IN struct vnode *a_vp;
1012 IN int a_attrnamespace;
1013 IN const char *a_name;
1014 INOUT struct uio *a_uio;
1015 IN struct ucred *a_cred;
1016 IN struct thread *a_td;
1017 };
1018 */
1019 {
1020 struct mount *mp = ap->a_vp->v_mount;
1021 struct ufsmount *ump = VFSTOUFS(mp);
1022 int error;
1023
1024 /*
1025 * XXX: No longer a supported way to delete extended attributes.
1026 */
1027 if (ap->a_uio == NULL)
1028 return (EINVAL);
1029
1030 ufs_extattr_uepm_lock(ump);
1031
1032 error = ufs_extattr_set(ap->a_vp, ap->a_attrnamespace, ap->a_name,
1033 ap->a_uio, ap->a_cred, ap->a_td);
1034
1035 ufs_extattr_uepm_unlock(ump);
1036
1037 return (error);
1038 }
1039
1040 /*
1041 * Real work associated with setting a vnode's extended attributes;
1042 * assumes that the attribute lock has already been grabbed.
1043 */
1044 static int
ufs_extattr_set(struct vnode * vp,int attrnamespace,const char * name,struct uio * uio,struct ucred * cred,struct thread * td)1045 ufs_extattr_set(struct vnode *vp, int attrnamespace, const char *name,
1046 struct uio *uio, struct ucred *cred, struct thread *td)
1047 {
1048 struct ufs_extattr_list_entry *attribute;
1049 struct ufs_extattr_header ueh;
1050 struct iovec local_aiov;
1051 struct uio local_aio;
1052 struct mount *mp = vp->v_mount;
1053 struct ufsmount *ump = VFSTOUFS(mp);
1054 struct inode *ip = VTOI(vp);
1055 off_t base_offset;
1056 int error = 0, ioflag;
1057
1058 if (vp->v_mount->mnt_flag & MNT_RDONLY)
1059 return (EROFS);
1060 if (!(ump->um_extattr.uepm_flags & UFS_EXTATTR_UEPM_STARTED))
1061 return (EOPNOTSUPP);
1062 if (!ufs_extattr_valid_attrname(attrnamespace, name))
1063 return (EINVAL);
1064
1065 error = extattr_check_cred(vp, attrnamespace, cred, td, VWRITE);
1066 if (error)
1067 return (error);
1068
1069 attribute = ufs_extattr_find_attr(ump, attrnamespace, name);
1070 if (!attribute)
1071 return (ENOATTR);
1072
1073 /*
1074 * Early rejection of invalid offsets/length.
1075 * Reject: any offset but 0 (replace)
1076 * Any size greater than attribute size limit
1077 */
1078 if (uio->uio_offset != 0 ||
1079 uio->uio_resid > attribute->uele_fileheader.uef_size)
1080 return (ENXIO);
1081
1082 /*
1083 * Find base offset of header in file based on file header size, and
1084 * data header size + maximum data size, indexed by inode number.
1085 */
1086 base_offset = sizeof(struct ufs_extattr_fileheader) +
1087 ip->i_number * (sizeof(struct ufs_extattr_header) +
1088 attribute->uele_fileheader.uef_size);
1089
1090 /*
1091 * Write out a data header for the data.
1092 */
1093 ueh.ueh_len = uio->uio_resid;
1094 ueh.ueh_flags = UFS_EXTATTR_ATTR_FLAG_INUSE;
1095 ueh.ueh_i_gen = ip->i_gen;
1096 local_aiov.iov_base = (caddr_t) &ueh;
1097 local_aiov.iov_len = sizeof(struct ufs_extattr_header);
1098 local_aio.uio_iov = &local_aiov;
1099 local_aio.uio_iovcnt = 1;
1100 local_aio.uio_rw = UIO_WRITE;
1101 local_aio.uio_segflg = UIO_SYSSPACE;
1102 local_aio.uio_td = td;
1103 local_aio.uio_offset = base_offset;
1104 local_aio.uio_resid = sizeof(struct ufs_extattr_header);
1105
1106 /*
1107 * Acquire locks.
1108 *
1109 * Don't need to get a lock on the backing file if the setattr is
1110 * being applied to the backing file, as the lock is already held.
1111 */
1112 if (attribute->uele_backing_vnode != vp)
1113 vn_lock(attribute->uele_backing_vnode, LK_EXCLUSIVE | LK_RETRY);
1114
1115 ioflag = IO_NODELOCKED;
1116 if (ufs_extattr_sync)
1117 ioflag |= IO_SYNC;
1118 error = VOP_WRITE(attribute->uele_backing_vnode, &local_aio, ioflag,
1119 ump->um_extattr.uepm_ucred);
1120 if (error)
1121 goto vopunlock_exit;
1122
1123 if (local_aio.uio_resid != 0) {
1124 error = ENXIO;
1125 goto vopunlock_exit;
1126 }
1127
1128 /*
1129 * Write out user data.
1130 */
1131 uio->uio_offset = base_offset + sizeof(struct ufs_extattr_header);
1132
1133 ioflag = IO_NODELOCKED;
1134 if (ufs_extattr_sync)
1135 ioflag |= IO_SYNC;
1136 error = VOP_WRITE(attribute->uele_backing_vnode, uio, ioflag,
1137 ump->um_extattr.uepm_ucred);
1138
1139 vopunlock_exit:
1140 uio->uio_offset = 0;
1141
1142 if (attribute->uele_backing_vnode != vp)
1143 VOP_UNLOCK(attribute->uele_backing_vnode, 0);
1144
1145 return (error);
1146 }
1147
1148 /*
1149 * Real work associated with removing an extended attribute from a vnode.
1150 * Assumes the attribute lock has already been grabbed.
1151 */
1152 static int
ufs_extattr_rm(struct vnode * vp,int attrnamespace,const char * name,struct ucred * cred,struct thread * td)1153 ufs_extattr_rm(struct vnode *vp, int attrnamespace, const char *name,
1154 struct ucred *cred, struct thread *td)
1155 {
1156 struct ufs_extattr_list_entry *attribute;
1157 struct ufs_extattr_header ueh;
1158 struct iovec local_aiov;
1159 struct uio local_aio;
1160 struct mount *mp = vp->v_mount;
1161 struct ufsmount *ump = VFSTOUFS(mp);
1162 struct inode *ip = VTOI(vp);
1163 off_t base_offset;
1164 int error = 0, ioflag;
1165
1166 if (vp->v_mount->mnt_flag & MNT_RDONLY)
1167 return (EROFS);
1168 if (!(ump->um_extattr.uepm_flags & UFS_EXTATTR_UEPM_STARTED))
1169 return (EOPNOTSUPP);
1170 if (!ufs_extattr_valid_attrname(attrnamespace, name))
1171 return (EINVAL);
1172
1173 error = extattr_check_cred(vp, attrnamespace, cred, td, VWRITE);
1174 if (error)
1175 return (error);
1176
1177 attribute = ufs_extattr_find_attr(ump, attrnamespace, name);
1178 if (!attribute)
1179 return (ENOATTR);
1180
1181 /*
1182 * Find base offset of header in file based on file header size, and
1183 * data header size + maximum data size, indexed by inode number.
1184 */
1185 base_offset = sizeof(struct ufs_extattr_fileheader) +
1186 ip->i_number * (sizeof(struct ufs_extattr_header) +
1187 attribute->uele_fileheader.uef_size);
1188
1189 /*
1190 * Check to see if currently defined.
1191 */
1192 bzero(&ueh, sizeof(struct ufs_extattr_header));
1193
1194 local_aiov.iov_base = (caddr_t) &ueh;
1195 local_aiov.iov_len = sizeof(struct ufs_extattr_header);
1196 local_aio.uio_iov = &local_aiov;
1197 local_aio.uio_iovcnt = 1;
1198 local_aio.uio_rw = UIO_READ;
1199 local_aio.uio_segflg = UIO_SYSSPACE;
1200 local_aio.uio_td = td;
1201 local_aio.uio_offset = base_offset;
1202 local_aio.uio_resid = sizeof(struct ufs_extattr_header);
1203
1204 /*
1205 * Don't need to get the lock on the backing vnode if the vnode we're
1206 * modifying is it, as we already hold the lock.
1207 */
1208 if (attribute->uele_backing_vnode != vp)
1209 vn_lock(attribute->uele_backing_vnode, LK_EXCLUSIVE | LK_RETRY);
1210
1211 error = VOP_READ(attribute->uele_backing_vnode, &local_aio,
1212 IO_NODELOCKED, ump->um_extattr.uepm_ucred);
1213 if (error)
1214 goto vopunlock_exit;
1215
1216 /* Defined? */
1217 if ((ueh.ueh_flags & UFS_EXTATTR_ATTR_FLAG_INUSE) == 0) {
1218 error = ENOATTR;
1219 goto vopunlock_exit;
1220 }
1221
1222 /* Valid for the current inode generation? */
1223 if (ueh.ueh_i_gen != ip->i_gen) {
1224 /*
1225 * The inode itself has a different generation number than
1226 * the attribute data. For now, the best solution is to
1227 * coerce this to undefined, and let it get cleaned up by
1228 * the next write or extattrctl clean.
1229 */
1230 printf("ufs_extattr_rm (%s): inode number inconsistency (%d, %jd)\n",
1231 mp->mnt_stat.f_mntonname, ueh.ueh_i_gen, (intmax_t)ip->i_gen);
1232 error = ENOATTR;
1233 goto vopunlock_exit;
1234 }
1235
1236 /* Flag it as not in use. */
1237 ueh.ueh_flags = 0;
1238 ueh.ueh_len = 0;
1239
1240 local_aiov.iov_base = (caddr_t) &ueh;
1241 local_aiov.iov_len = sizeof(struct ufs_extattr_header);
1242 local_aio.uio_iov = &local_aiov;
1243 local_aio.uio_iovcnt = 1;
1244 local_aio.uio_rw = UIO_WRITE;
1245 local_aio.uio_segflg = UIO_SYSSPACE;
1246 local_aio.uio_td = td;
1247 local_aio.uio_offset = base_offset;
1248 local_aio.uio_resid = sizeof(struct ufs_extattr_header);
1249
1250 ioflag = IO_NODELOCKED;
1251 if (ufs_extattr_sync)
1252 ioflag |= IO_SYNC;
1253 error = VOP_WRITE(attribute->uele_backing_vnode, &local_aio, ioflag,
1254 ump->um_extattr.uepm_ucred);
1255 if (error)
1256 goto vopunlock_exit;
1257
1258 if (local_aio.uio_resid != 0)
1259 error = ENXIO;
1260
1261 vopunlock_exit:
1262 VOP_UNLOCK(attribute->uele_backing_vnode, 0);
1263
1264 return (error);
1265 }
1266
1267 /*
1268 * Called by UFS when an inode is no longer active and should have its
1269 * attributes stripped.
1270 */
1271 void
ufs_extattr_vnode_inactive(struct vnode * vp,struct thread * td)1272 ufs_extattr_vnode_inactive(struct vnode *vp, struct thread *td)
1273 {
1274 struct ufs_extattr_list_entry *uele;
1275 struct mount *mp = vp->v_mount;
1276 struct ufsmount *ump = VFSTOUFS(mp);
1277
1278 /*
1279 * In that case, we cannot lock. We should not have any active vnodes
1280 * on the fs if this is not yet initialized but is going to be, so
1281 * this can go unlocked.
1282 */
1283 if (!(ump->um_extattr.uepm_flags & UFS_EXTATTR_UEPM_INITIALIZED))
1284 return;
1285
1286 ufs_extattr_uepm_lock(ump);
1287
1288 if (!(ump->um_extattr.uepm_flags & UFS_EXTATTR_UEPM_STARTED)) {
1289 ufs_extattr_uepm_unlock(ump);
1290 return;
1291 }
1292
1293 LIST_FOREACH(uele, &ump->um_extattr.uepm_list, uele_entries)
1294 ufs_extattr_rm(vp, uele->uele_attrnamespace,
1295 uele->uele_attrname, NULL, td);
1296
1297 ufs_extattr_uepm_unlock(ump);
1298 }
1299
1300 #endif /* !UFS_EXTATTR */
1301