1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 1999-2002 Robert N. M. Watson
5 * Copyright (c) 2002-2003 Networks Associates Technology, Inc.
6 * All rights reserved.
7 *
8 * This software was developed by Robert Watson for the TrustedBSD Project.
9 *
10 * This software was developed for the FreeBSD Project in part by Network
11 * Associates Laboratories, the Security Research Division of Network
12 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
13 * as part of the DARPA CHATS research program.
14 *
15 * Redistribution and use in source and binary forms, with or without
16 * modification, are permitted provided that the following conditions
17 * are met:
18 * 1. Redistributions of source code must retain the above copyright
19 * notice, this list of conditions and the following disclaimer.
20 * 2. Redistributions in binary form must reproduce the above copyright
21 * notice, this list of conditions and the following disclaimer in the
22 * documentation and/or other materials provided with the distribution.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 */
37
38 /*
39 * Support for filesystem extended attribute: UFS-specific support functions.
40 */
41
42 #include <sys/cdefs.h>
43 __FBSDID("$FreeBSD$");
44
45 #include "opt_ufs.h"
46
47 #include <sys/param.h>
48 #include <sys/systm.h>
49 #include <sys/kernel.h>
50 #include <sys/namei.h>
51 #include <sys/malloc.h>
52 #include <sys/fcntl.h>
53 #include <sys/priv.h>
54 #include <sys/proc.h>
55 #include <sys/vnode.h>
56 #include <sys/mount.h>
57 #include <sys/lock.h>
58 #include <sys/dirent.h>
59 #include <sys/extattr.h>
60 #include <sys/sx.h>
61 #include <sys/sysctl.h>
62
63 #include <vm/uma.h>
64
65 #include <ufs/ufs/dir.h>
66 #include <ufs/ufs/extattr.h>
67 #include <ufs/ufs/quota.h>
68 #include <ufs/ufs/ufsmount.h>
69 #include <ufs/ufs/inode.h>
70 #include <ufs/ufs/ufs_extern.h>
71
72 #ifdef UFS_EXTATTR
73
74 FEATURE(ufs_extattr, "ufs extended attribute support");
75
76 static MALLOC_DEFINE(M_UFS_EXTATTR, "ufs_extattr", "ufs extended attribute");
77
78 static int ufs_extattr_sync = 0;
79 SYSCTL_INT(_debug, OID_AUTO, ufs_extattr_sync, CTLFLAG_RW, &ufs_extattr_sync,
80 0, "");
81
82 static int ufs_extattr_valid_attrname(int attrnamespace,
83 const char *attrname);
84 static int ufs_extattr_enable_with_open(struct ufsmount *ump,
85 struct vnode *vp, int attrnamespace, const char *attrname,
86 struct thread *td);
87 static int ufs_extattr_enable(struct ufsmount *ump, int attrnamespace,
88 const char *attrname, struct vnode *backing_vnode,
89 struct thread *td);
90 static int ufs_extattr_disable(struct ufsmount *ump, int attrnamespace,
91 const char *attrname, struct thread *td);
92 static int ufs_extattr_get(struct vnode *vp, int attrnamespace,
93 const char *name, struct uio *uio, size_t *size,
94 struct ucred *cred, struct thread *td);
95 static int ufs_extattr_set(struct vnode *vp, int attrnamespace,
96 const char *name, struct uio *uio, struct ucred *cred,
97 struct thread *td);
98 static int ufs_extattr_rm(struct vnode *vp, int attrnamespace,
99 const char *name, struct ucred *cred, struct thread *td);
100 #ifdef UFS_EXTATTR_AUTOSTART
101 static int ufs_extattr_autostart_locked(struct mount *mp,
102 struct thread *td);
103 #endif
104 static int ufs_extattr_start_locked(struct ufsmount *ump,
105 struct thread *td);
106
107 /*
108 * Per-FS attribute lock protecting attribute operations.
109 *
110 * XXXRW: Perhaps something more fine-grained would be appropriate, but at
111 * the end of the day we're going to contend on the vnode lock for the
112 * backing file anyway.
113 */
114 static void
ufs_extattr_uepm_lock(struct ufsmount * ump)115 ufs_extattr_uepm_lock(struct ufsmount *ump)
116 {
117
118 sx_xlock(&ump->um_extattr.uepm_lock);
119 }
120
121 static void
ufs_extattr_uepm_unlock(struct ufsmount * ump)122 ufs_extattr_uepm_unlock(struct ufsmount *ump)
123 {
124
125 sx_xunlock(&ump->um_extattr.uepm_lock);
126 }
127
128 /*-
129 * Determine whether the name passed is a valid name for an actual
130 * attribute.
131 *
132 * Invalid currently consists of:
133 * NULL pointer for attrname
134 * zero-length attrname (used to retrieve application attribute list)
135 */
136 static int
ufs_extattr_valid_attrname(int attrnamespace,const char * attrname)137 ufs_extattr_valid_attrname(int attrnamespace, const char *attrname)
138 {
139
140 if (attrname == NULL)
141 return (0);
142 if (strlen(attrname) == 0)
143 return (0);
144 return (1);
145 }
146
147 /*
148 * Locate an attribute given a name and mountpoint.
149 * Must be holding uepm lock for the mount point.
150 */
151 static struct ufs_extattr_list_entry *
ufs_extattr_find_attr(struct ufsmount * ump,int attrnamespace,const char * attrname)152 ufs_extattr_find_attr(struct ufsmount *ump, int attrnamespace,
153 const char *attrname)
154 {
155 struct ufs_extattr_list_entry *search_attribute;
156
157 sx_assert(&ump->um_extattr.uepm_lock, SA_XLOCKED);
158
159 for (search_attribute = LIST_FIRST(&ump->um_extattr.uepm_list);
160 search_attribute != NULL;
161 search_attribute = LIST_NEXT(search_attribute, uele_entries)) {
162 if (!(strncmp(attrname, search_attribute->uele_attrname,
163 UFS_EXTATTR_MAXEXTATTRNAME)) &&
164 (attrnamespace == search_attribute->uele_attrnamespace)) {
165 return (search_attribute);
166 }
167 }
168
169 return (0);
170 }
171
172 /*
173 * Initialize per-FS structures supporting extended attributes. Do not
174 * start extended attributes yet.
175 */
176 void
ufs_extattr_uepm_init(struct ufs_extattr_per_mount * uepm)177 ufs_extattr_uepm_init(struct ufs_extattr_per_mount *uepm)
178 {
179
180 uepm->uepm_flags = 0;
181 LIST_INIT(&uepm->uepm_list);
182 sx_init(&uepm->uepm_lock, "ufs_extattr_sx");
183 uepm->uepm_flags |= UFS_EXTATTR_UEPM_INITIALIZED;
184 }
185
186 /*
187 * Destroy per-FS structures supporting extended attributes. Assumes
188 * that EAs have already been stopped, and will panic if not.
189 */
190 void
ufs_extattr_uepm_destroy(struct ufs_extattr_per_mount * uepm)191 ufs_extattr_uepm_destroy(struct ufs_extattr_per_mount *uepm)
192 {
193
194 if (!(uepm->uepm_flags & UFS_EXTATTR_UEPM_INITIALIZED))
195 panic("ufs_extattr_uepm_destroy: not initialized");
196
197 if ((uepm->uepm_flags & UFS_EXTATTR_UEPM_STARTED))
198 panic("ufs_extattr_uepm_destroy: called while still started");
199
200 /*
201 * It's not clear that either order for the next two lines is
202 * ideal, and it should never be a problem if this is only called
203 * during unmount, and with vfs_busy().
204 */
205 uepm->uepm_flags &= ~UFS_EXTATTR_UEPM_INITIALIZED;
206 sx_destroy(&uepm->uepm_lock);
207 }
208
209 /*
210 * Start extended attribute support on an FS.
211 */
212 int
ufs_extattr_start(struct mount * mp,struct thread * td)213 ufs_extattr_start(struct mount *mp, struct thread *td)
214 {
215 struct ufsmount *ump;
216 int error = 0;
217
218 ump = VFSTOUFS(mp);
219
220 ufs_extattr_uepm_lock(ump);
221 error = ufs_extattr_start_locked(ump, td);
222 ufs_extattr_uepm_unlock(ump);
223 return (error);
224 }
225
226 static int
ufs_extattr_start_locked(struct ufsmount * ump,struct thread * td)227 ufs_extattr_start_locked(struct ufsmount *ump, struct thread *td)
228 {
229 if (!(ump->um_extattr.uepm_flags & UFS_EXTATTR_UEPM_INITIALIZED))
230 return (EOPNOTSUPP);
231 if (ump->um_extattr.uepm_flags & UFS_EXTATTR_UEPM_STARTED)
232 return (EBUSY);
233
234 ump->um_extattr.uepm_flags |= UFS_EXTATTR_UEPM_STARTED;
235 ump->um_extattr.uepm_ucred = crhold(td->td_ucred);
236 return (0);
237 }
238
239 #ifdef UFS_EXTATTR_AUTOSTART
240 /*
241 * Helper routine: given a locked parent directory and filename, return
242 * the locked vnode of the inode associated with the name. Will not
243 * follow symlinks, may return any type of vnode. Lock on parent will
244 * be released even in the event of a failure. In the event that the
245 * target is the parent (i.e., "."), there will be two references and
246 * one lock, requiring the caller to possibly special-case.
247 */
248 #define UE_GETDIR_LOCKPARENT 1
249 #define UE_GETDIR_LOCKPARENT_DONT 2
250 static int
ufs_extattr_lookup(struct vnode * start_dvp,int lockparent,char * dirname,struct vnode ** vp,struct thread * td)251 ufs_extattr_lookup(struct vnode *start_dvp, int lockparent, char *dirname,
252 struct vnode **vp, struct thread *td)
253 {
254 struct vop_cachedlookup_args vargs;
255 struct componentname cnp;
256 struct vnode *target_vp;
257 int error;
258
259 bzero(&cnp, sizeof(cnp));
260 cnp.cn_nameiop = LOOKUP;
261 cnp.cn_flags = ISLASTCN;
262 if (lockparent == UE_GETDIR_LOCKPARENT)
263 cnp.cn_flags |= LOCKPARENT;
264 cnp.cn_lkflags = LK_EXCLUSIVE;
265 cnp.cn_thread = td;
266 cnp.cn_cred = td->td_ucred;
267 cnp.cn_pnbuf = uma_zalloc(namei_zone, M_WAITOK);
268 cnp.cn_nameptr = cnp.cn_pnbuf;
269 error = copystr(dirname, cnp.cn_pnbuf, MAXPATHLEN,
270 (size_t *) &cnp.cn_namelen);
271 if (error) {
272 if (lockparent == UE_GETDIR_LOCKPARENT_DONT) {
273 VOP_UNLOCK(start_dvp, 0);
274 }
275 uma_zfree(namei_zone, cnp.cn_pnbuf);
276 printf("ufs_extattr_lookup: copystr failed\n");
277 return (error);
278 }
279 cnp.cn_namelen--; /* trim nul termination */
280 vargs.a_gen.a_desc = NULL;
281 vargs.a_dvp = start_dvp;
282 vargs.a_vpp = &target_vp;
283 vargs.a_cnp = &cnp;
284 error = ufs_lookup(&vargs);
285 uma_zfree(namei_zone, cnp.cn_pnbuf);
286 if (error) {
287 /*
288 * Error condition, may have to release the lock on the parent
289 * if ufs_lookup() didn't.
290 */
291 if (lockparent == UE_GETDIR_LOCKPARENT_DONT)
292 VOP_UNLOCK(start_dvp, 0);
293
294 /*
295 * Check that ufs_lookup() didn't release the lock when we
296 * didn't want it to.
297 */
298 if (lockparent == UE_GETDIR_LOCKPARENT)
299 ASSERT_VOP_LOCKED(start_dvp, "ufs_extattr_lookup");
300
301 return (error);
302 }
303 /*
304 if (target_vp == start_dvp)
305 panic("ufs_extattr_lookup: target_vp == start_dvp");
306 */
307
308 if (target_vp != start_dvp && lockparent == UE_GETDIR_LOCKPARENT_DONT)
309 VOP_UNLOCK(start_dvp, 0);
310
311 if (lockparent == UE_GETDIR_LOCKPARENT)
312 ASSERT_VOP_LOCKED(start_dvp, "ufs_extattr_lookup");
313
314 /* printf("ufs_extattr_lookup: success\n"); */
315 *vp = target_vp;
316 return (0);
317 }
318 #endif /* !UFS_EXTATTR_AUTOSTART */
319
320 /*
321 * Enable an EA using the passed filesystem, backing vnode, attribute name,
322 * namespace, and proc. Will perform a VOP_OPEN() on the vp, so expects vp
323 * to be locked when passed in. The vnode will be returned unlocked,
324 * regardless of success/failure of the function. As a result, the caller
325 * will always need to vrele(), but not vput().
326 */
327 static int
ufs_extattr_enable_with_open(struct ufsmount * ump,struct vnode * vp,int attrnamespace,const char * attrname,struct thread * td)328 ufs_extattr_enable_with_open(struct ufsmount *ump, struct vnode *vp,
329 int attrnamespace, const char *attrname, struct thread *td)
330 {
331 int error;
332
333 error = VOP_OPEN(vp, FREAD|FWRITE, td->td_ucred, td, NULL);
334 if (error) {
335 printf("ufs_extattr_enable_with_open.VOP_OPEN(): failed "
336 "with %d\n", error);
337 VOP_UNLOCK(vp, 0);
338 return (error);
339 }
340
341 error = VOP_ADD_WRITECOUNT(vp, 1);
342 if (error != 0) {
343 VOP_CLOSE(vp, FREAD | FWRITE, td->td_ucred, td);
344 VOP_UNLOCK(vp, 0);
345 return (error);
346 }
347 CTR3(KTR_VFS, "%s: vp %p v_writecount increased to %d", __func__, vp,
348 vp->v_writecount);
349
350 vref(vp);
351
352 VOP_UNLOCK(vp, 0);
353
354 error = ufs_extattr_enable(ump, attrnamespace, attrname, vp, td);
355 if (error != 0)
356 vn_close(vp, FREAD|FWRITE, td->td_ucred, td);
357 return (error);
358 }
359
360 #ifdef UFS_EXTATTR_AUTOSTART
361 /*
362 * Given a locked directory vnode, iterate over the names in the directory
363 * and use ufs_extattr_lookup() to retrieve locked vnodes of potential
364 * attribute files. Then invoke ufs_extattr_enable_with_open() on each
365 * to attempt to start the attribute. Leaves the directory locked on
366 * exit.
367 */
368 static int
ufs_extattr_iterate_directory(struct ufsmount * ump,struct vnode * dvp,int attrnamespace,struct thread * td)369 ufs_extattr_iterate_directory(struct ufsmount *ump, struct vnode *dvp,
370 int attrnamespace, struct thread *td)
371 {
372 struct vop_readdir_args vargs;
373 struct dirent *dp, *edp;
374 struct vnode *attr_vp;
375 struct uio auio;
376 struct iovec aiov;
377 char *dirbuf;
378 int error, eofflag = 0;
379
380 if (dvp->v_type != VDIR)
381 return (ENOTDIR);
382
383 dirbuf = malloc(DIRBLKSIZ, M_TEMP, M_WAITOK);
384
385 auio.uio_iov = &aiov;
386 auio.uio_iovcnt = 1;
387 auio.uio_rw = UIO_READ;
388 auio.uio_segflg = UIO_SYSSPACE;
389 auio.uio_td = td;
390 auio.uio_offset = 0;
391
392 vargs.a_gen.a_desc = NULL;
393 vargs.a_vp = dvp;
394 vargs.a_uio = &auio;
395 vargs.a_cred = td->td_ucred;
396 vargs.a_eofflag = &eofflag;
397 vargs.a_ncookies = NULL;
398 vargs.a_cookies = NULL;
399
400 while (!eofflag) {
401 auio.uio_resid = DIRBLKSIZ;
402 aiov.iov_base = dirbuf;
403 aiov.iov_len = DIRBLKSIZ;
404 error = ufs_readdir(&vargs);
405 if (error) {
406 printf("ufs_extattr_iterate_directory: ufs_readdir "
407 "%d\n", error);
408 return (error);
409 }
410
411 edp = (struct dirent *)&dirbuf[DIRBLKSIZ - auio.uio_resid];
412 for (dp = (struct dirent *)dirbuf; dp < edp; ) {
413 if (dp->d_reclen == 0)
414 break;
415 error = ufs_extattr_lookup(dvp, UE_GETDIR_LOCKPARENT,
416 dp->d_name, &attr_vp, td);
417 if (error) {
418 printf("ufs_extattr_iterate_directory: lookup "
419 "%s %d\n", dp->d_name, error);
420 } else if (attr_vp == dvp) {
421 vrele(attr_vp);
422 } else if (attr_vp->v_type != VREG) {
423 vput(attr_vp);
424 } else {
425 error = ufs_extattr_enable_with_open(ump,
426 attr_vp, attrnamespace, dp->d_name, td);
427 vrele(attr_vp);
428 if (error) {
429 printf("ufs_extattr_iterate_directory: "
430 "enable %s %d\n", dp->d_name,
431 error);
432 } else if (bootverbose) {
433 printf("UFS autostarted EA %s\n",
434 dp->d_name);
435 }
436 }
437 dp = (struct dirent *) ((char *)dp + dp->d_reclen);
438 if (dp >= edp)
439 break;
440 }
441 }
442 free(dirbuf, M_TEMP);
443
444 return (0);
445 }
446
447 /*
448 * Auto-start of extended attributes, to be executed (optionally) at
449 * mount-time.
450 */
451 int
ufs_extattr_autostart(struct mount * mp,struct thread * td)452 ufs_extattr_autostart(struct mount *mp, struct thread *td)
453 {
454 struct ufsmount *ump;
455 int error;
456
457 ump = VFSTOUFS(mp);
458 ufs_extattr_uepm_lock(ump);
459 error = ufs_extattr_autostart_locked(mp, td);
460 ufs_extattr_uepm_unlock(ump);
461 return (error);
462 }
463
464 static int
ufs_extattr_autostart_locked(struct mount * mp,struct thread * td)465 ufs_extattr_autostart_locked(struct mount *mp, struct thread *td)
466 {
467 struct vnode *rvp, *attr_dvp, *attr_system_dvp, *attr_user_dvp;
468 struct ufsmount *ump = VFSTOUFS(mp);
469 int error;
470
471 /*
472 * UFS_EXTATTR applies only to UFS1, as UFS2 uses native extended
473 * attributes, so don't autostart.
474 */
475 if (ump->um_fstype != UFS1)
476 return (0);
477
478 /*
479 * Does UFS_EXTATTR_FSROOTSUBDIR exist off the filesystem root?
480 * If so, automatically start EA's.
481 */
482 error = VFS_ROOT(mp, LK_EXCLUSIVE, &rvp);
483 if (error) {
484 printf("ufs_extattr_autostart.VFS_ROOT() returned %d\n",
485 error);
486 return (error);
487 }
488
489 error = ufs_extattr_lookup(rvp, UE_GETDIR_LOCKPARENT_DONT,
490 UFS_EXTATTR_FSROOTSUBDIR, &attr_dvp, td);
491 if (error) {
492 /* rvp ref'd but now unlocked */
493 vrele(rvp);
494 return (error);
495 }
496 if (rvp == attr_dvp) {
497 /* Should never happen. */
498 vput(rvp);
499 vrele(attr_dvp);
500 return (EINVAL);
501 }
502 vrele(rvp);
503
504 if (attr_dvp->v_type != VDIR) {
505 printf("ufs_extattr_autostart: %s != VDIR\n",
506 UFS_EXTATTR_FSROOTSUBDIR);
507 goto return_vput_attr_dvp;
508 }
509
510 error = ufs_extattr_start_locked(ump, td);
511 if (error) {
512 printf("ufs_extattr_autostart: ufs_extattr_start failed (%d)\n",
513 error);
514 goto return_vput_attr_dvp;
515 }
516
517 /*
518 * Look for two subdirectories: UFS_EXTATTR_SUBDIR_SYSTEM,
519 * UFS_EXTATTR_SUBDIR_USER. For each, iterate over the sub-directory,
520 * and start with appropriate type. Failures in either don't
521 * result in an over-all failure. attr_dvp is left locked to
522 * be cleaned up on exit.
523 */
524 error = ufs_extattr_lookup(attr_dvp, UE_GETDIR_LOCKPARENT,
525 UFS_EXTATTR_SUBDIR_SYSTEM, &attr_system_dvp, td);
526 if (!error) {
527 error = ufs_extattr_iterate_directory(VFSTOUFS(mp),
528 attr_system_dvp, EXTATTR_NAMESPACE_SYSTEM, td);
529 if (error)
530 printf("ufs_extattr_iterate_directory returned %d\n",
531 error);
532 vput(attr_system_dvp);
533 }
534
535 error = ufs_extattr_lookup(attr_dvp, UE_GETDIR_LOCKPARENT,
536 UFS_EXTATTR_SUBDIR_USER, &attr_user_dvp, td);
537 if (!error) {
538 error = ufs_extattr_iterate_directory(VFSTOUFS(mp),
539 attr_user_dvp, EXTATTR_NAMESPACE_USER, td);
540 if (error)
541 printf("ufs_extattr_iterate_directory returned %d\n",
542 error);
543 vput(attr_user_dvp);
544 }
545
546 /* Mask startup failures in sub-directories. */
547 error = 0;
548
549 return_vput_attr_dvp:
550 vput(attr_dvp);
551
552 return (error);
553 }
554 #endif /* !UFS_EXTATTR_AUTOSTART */
555
556 /*
557 * Stop extended attribute support on an FS.
558 */
559 int
ufs_extattr_stop(struct mount * mp,struct thread * td)560 ufs_extattr_stop(struct mount *mp, struct thread *td)
561 {
562 struct ufs_extattr_list_entry *uele;
563 struct ufsmount *ump = VFSTOUFS(mp);
564 int error = 0;
565
566 ufs_extattr_uepm_lock(ump);
567
568 if (!(ump->um_extattr.uepm_flags & UFS_EXTATTR_UEPM_STARTED)) {
569 error = EOPNOTSUPP;
570 goto unlock;
571 }
572
573 while ((uele = LIST_FIRST(&ump->um_extattr.uepm_list)) != NULL) {
574 ufs_extattr_disable(ump, uele->uele_attrnamespace,
575 uele->uele_attrname, td);
576 }
577
578 ump->um_extattr.uepm_flags &= ~UFS_EXTATTR_UEPM_STARTED;
579
580 crfree(ump->um_extattr.uepm_ucred);
581 ump->um_extattr.uepm_ucred = NULL;
582
583 unlock:
584 ufs_extattr_uepm_unlock(ump);
585
586 return (error);
587 }
588
589 /*
590 * Enable a named attribute on the specified filesystem; provide an
591 * unlocked backing vnode to hold the attribute data.
592 */
593 static int
ufs_extattr_enable(struct ufsmount * ump,int attrnamespace,const char * attrname,struct vnode * backing_vnode,struct thread * td)594 ufs_extattr_enable(struct ufsmount *ump, int attrnamespace,
595 const char *attrname, struct vnode *backing_vnode, struct thread *td)
596 {
597 struct ufs_extattr_list_entry *attribute;
598 struct iovec aiov;
599 struct uio auio;
600 int error = 0;
601
602 if (!ufs_extattr_valid_attrname(attrnamespace, attrname))
603 return (EINVAL);
604 if (backing_vnode->v_type != VREG)
605 return (EINVAL);
606
607 attribute = malloc(sizeof(struct ufs_extattr_list_entry),
608 M_UFS_EXTATTR, M_WAITOK);
609
610 if (!(ump->um_extattr.uepm_flags & UFS_EXTATTR_UEPM_STARTED)) {
611 error = EOPNOTSUPP;
612 goto free_exit;
613 }
614
615 if (ufs_extattr_find_attr(ump, attrnamespace, attrname)) {
616 error = EEXIST;
617 goto free_exit;
618 }
619
620 strncpy(attribute->uele_attrname, attrname,
621 UFS_EXTATTR_MAXEXTATTRNAME);
622 attribute->uele_attrnamespace = attrnamespace;
623 bzero(&attribute->uele_fileheader,
624 sizeof(struct ufs_extattr_fileheader));
625
626 attribute->uele_backing_vnode = backing_vnode;
627
628 auio.uio_iov = &aiov;
629 auio.uio_iovcnt = 1;
630 aiov.iov_base = (caddr_t) &attribute->uele_fileheader;
631 aiov.iov_len = sizeof(struct ufs_extattr_fileheader);
632 auio.uio_resid = sizeof(struct ufs_extattr_fileheader);
633 auio.uio_offset = (off_t) 0;
634 auio.uio_segflg = UIO_SYSSPACE;
635 auio.uio_rw = UIO_READ;
636 auio.uio_td = td;
637
638 vn_lock(backing_vnode, LK_SHARED | LK_RETRY);
639 error = VOP_READ(backing_vnode, &auio, IO_NODELOCKED,
640 ump->um_extattr.uepm_ucred);
641
642 if (error)
643 goto unlock_free_exit;
644
645 if (auio.uio_resid != 0) {
646 printf("ufs_extattr_enable: malformed attribute header\n");
647 error = EINVAL;
648 goto unlock_free_exit;
649 }
650
651 if (attribute->uele_fileheader.uef_magic != UFS_EXTATTR_MAGIC) {
652 printf("ufs_extattr_enable: invalid attribute header magic\n");
653 error = EINVAL;
654 goto unlock_free_exit;
655 }
656
657 if (attribute->uele_fileheader.uef_version != UFS_EXTATTR_VERSION) {
658 printf("ufs_extattr_enable: incorrect attribute header "
659 "version\n");
660 error = EINVAL;
661 goto unlock_free_exit;
662 }
663
664 ASSERT_VOP_LOCKED(backing_vnode, "ufs_extattr_enable");
665 LIST_INSERT_HEAD(&ump->um_extattr.uepm_list, attribute,
666 uele_entries);
667
668 VOP_UNLOCK(backing_vnode, 0);
669 return (0);
670
671 unlock_free_exit:
672 VOP_UNLOCK(backing_vnode, 0);
673
674 free_exit:
675 free(attribute, M_UFS_EXTATTR);
676 return (error);
677 }
678
679 /*
680 * Disable extended attribute support on an FS.
681 */
682 static int
ufs_extattr_disable(struct ufsmount * ump,int attrnamespace,const char * attrname,struct thread * td)683 ufs_extattr_disable(struct ufsmount *ump, int attrnamespace,
684 const char *attrname, struct thread *td)
685 {
686 struct ufs_extattr_list_entry *uele;
687 int error = 0;
688
689 if (!ufs_extattr_valid_attrname(attrnamespace, attrname))
690 return (EINVAL);
691
692 uele = ufs_extattr_find_attr(ump, attrnamespace, attrname);
693 if (!uele)
694 return (ENOATTR);
695
696 LIST_REMOVE(uele, uele_entries);
697
698 vn_lock(uele->uele_backing_vnode, LK_SHARED | LK_RETRY);
699 ASSERT_VOP_LOCKED(uele->uele_backing_vnode, "ufs_extattr_disable");
700 VOP_UNLOCK(uele->uele_backing_vnode, 0);
701 error = vn_close(uele->uele_backing_vnode, FREAD|FWRITE,
702 td->td_ucred, td);
703
704 free(uele, M_UFS_EXTATTR);
705
706 return (error);
707 }
708
709 /*
710 * VFS call to manage extended attributes in UFS. If filename_vp is
711 * non-NULL, it must be passed in locked, and regardless of errors in
712 * processing, will be unlocked.
713 */
714 int
ufs_extattrctl(struct mount * mp,int cmd,struct vnode * filename_vp,int attrnamespace,const char * attrname)715 ufs_extattrctl(struct mount *mp, int cmd, struct vnode *filename_vp,
716 int attrnamespace, const char *attrname)
717 {
718 struct ufsmount *ump = VFSTOUFS(mp);
719 struct thread *td = curthread;
720 int error;
721
722 /*
723 * Processes with privilege, but in jail, are not allowed to
724 * configure extended attributes.
725 */
726 error = priv_check(td, PRIV_UFS_EXTATTRCTL);
727 if (error) {
728 if (filename_vp != NULL)
729 VOP_UNLOCK(filename_vp, 0);
730 return (error);
731 }
732
733 /*
734 * We only allow extattrctl(2) on UFS1 file systems, as UFS2 uses
735 * native extended attributes.
736 */
737 if (ump->um_fstype != UFS1) {
738 if (filename_vp != NULL)
739 VOP_UNLOCK(filename_vp, 0);
740 return (EOPNOTSUPP);
741 }
742
743 switch(cmd) {
744 case UFS_EXTATTR_CMD_START:
745 if (filename_vp != NULL) {
746 VOP_UNLOCK(filename_vp, 0);
747 return (EINVAL);
748 }
749 if (attrname != NULL)
750 return (EINVAL);
751
752 error = ufs_extattr_start(mp, td);
753
754 return (error);
755
756 case UFS_EXTATTR_CMD_STOP:
757 if (filename_vp != NULL) {
758 VOP_UNLOCK(filename_vp, 0);
759 return (EINVAL);
760 }
761 if (attrname != NULL)
762 return (EINVAL);
763
764 error = ufs_extattr_stop(mp, td);
765
766 return (error);
767
768 case UFS_EXTATTR_CMD_ENABLE:
769
770 if (filename_vp == NULL)
771 return (EINVAL);
772 if (attrname == NULL) {
773 VOP_UNLOCK(filename_vp, 0);
774 return (EINVAL);
775 }
776
777 /*
778 * ufs_extattr_enable_with_open() will always unlock the
779 * vnode, regardless of failure.
780 */
781 ufs_extattr_uepm_lock(ump);
782 error = ufs_extattr_enable_with_open(ump, filename_vp,
783 attrnamespace, attrname, td);
784 ufs_extattr_uepm_unlock(ump);
785
786 return (error);
787
788 case UFS_EXTATTR_CMD_DISABLE:
789
790 if (filename_vp != NULL) {
791 VOP_UNLOCK(filename_vp, 0);
792 return (EINVAL);
793 }
794 if (attrname == NULL)
795 return (EINVAL);
796
797 ufs_extattr_uepm_lock(ump);
798 error = ufs_extattr_disable(ump, attrnamespace, attrname,
799 td);
800 ufs_extattr_uepm_unlock(ump);
801
802 return (error);
803
804 default:
805 return (EINVAL);
806 }
807 }
808
809 /*
810 * Vnode operating to retrieve a named extended attribute.
811 */
812 int
ufs_getextattr(struct vop_getextattr_args * ap)813 ufs_getextattr(struct vop_getextattr_args *ap)
814 /*
815 vop_getextattr {
816 IN struct vnode *a_vp;
817 IN int a_attrnamespace;
818 IN const char *a_name;
819 INOUT struct uio *a_uio;
820 OUT size_t *a_size;
821 IN struct ucred *a_cred;
822 IN struct thread *a_td;
823 };
824 */
825 {
826 struct mount *mp = ap->a_vp->v_mount;
827 struct ufsmount *ump = VFSTOUFS(mp);
828 int error;
829
830 ufs_extattr_uepm_lock(ump);
831
832 error = ufs_extattr_get(ap->a_vp, ap->a_attrnamespace, ap->a_name,
833 ap->a_uio, ap->a_size, ap->a_cred, ap->a_td);
834
835 ufs_extattr_uepm_unlock(ump);
836
837 return (error);
838 }
839
840 /*
841 * Real work associated with retrieving a named attribute--assumes that
842 * the attribute lock has already been grabbed.
843 */
844 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)845 ufs_extattr_get(struct vnode *vp, int attrnamespace, const char *name,
846 struct uio *uio, size_t *size, struct ucred *cred, struct thread *td)
847 {
848 struct ufs_extattr_list_entry *attribute;
849 struct ufs_extattr_header ueh;
850 struct iovec local_aiov;
851 struct uio local_aio;
852 struct mount *mp = vp->v_mount;
853 struct ufsmount *ump = VFSTOUFS(mp);
854 struct inode *ip = VTOI(vp);
855 off_t base_offset;
856 size_t len, old_len;
857 int error = 0;
858
859 if (!(ump->um_extattr.uepm_flags & UFS_EXTATTR_UEPM_STARTED))
860 return (EOPNOTSUPP);
861
862 if (strlen(name) == 0)
863 return (EINVAL);
864
865 error = extattr_check_cred(vp, attrnamespace, cred, td, VREAD);
866 if (error)
867 return (error);
868
869 attribute = ufs_extattr_find_attr(ump, attrnamespace, name);
870 if (!attribute)
871 return (ENOATTR);
872
873 /*
874 * Allow only offsets of zero to encourage the read/replace
875 * extended attribute semantic. Otherwise we can't guarantee
876 * atomicity, as we don't provide locks for extended attributes.
877 */
878 if (uio != NULL && uio->uio_offset != 0)
879 return (ENXIO);
880
881 /*
882 * Find base offset of header in file based on file header size, and
883 * data header size + maximum data size, indexed by inode number.
884 */
885 base_offset = sizeof(struct ufs_extattr_fileheader) +
886 ip->i_number * (sizeof(struct ufs_extattr_header) +
887 attribute->uele_fileheader.uef_size);
888
889 /*
890 * Read in the data header to see if the data is defined, and if so
891 * how much.
892 */
893 bzero(&ueh, sizeof(struct ufs_extattr_header));
894 local_aiov.iov_base = (caddr_t) &ueh;
895 local_aiov.iov_len = sizeof(struct ufs_extattr_header);
896 local_aio.uio_iov = &local_aiov;
897 local_aio.uio_iovcnt = 1;
898 local_aio.uio_rw = UIO_READ;
899 local_aio.uio_segflg = UIO_SYSSPACE;
900 local_aio.uio_td = td;
901 local_aio.uio_offset = base_offset;
902 local_aio.uio_resid = sizeof(struct ufs_extattr_header);
903
904 /*
905 * Acquire locks.
906 *
907 * Don't need to get a lock on the backing file if the getattr is
908 * being applied to the backing file, as the lock is already held.
909 */
910 if (attribute->uele_backing_vnode != vp)
911 vn_lock(attribute->uele_backing_vnode, LK_SHARED | LK_RETRY);
912
913 error = VOP_READ(attribute->uele_backing_vnode, &local_aio,
914 IO_NODELOCKED, ump->um_extattr.uepm_ucred);
915 if (error)
916 goto vopunlock_exit;
917
918 /* Defined? */
919 if ((ueh.ueh_flags & UFS_EXTATTR_ATTR_FLAG_INUSE) == 0) {
920 error = ENOATTR;
921 goto vopunlock_exit;
922 }
923
924 /* Valid for the current inode generation? */
925 if (ueh.ueh_i_gen != ip->i_gen) {
926 /*
927 * The inode itself has a different generation number
928 * than the attribute data. For now, the best solution
929 * is to coerce this to undefined, and let it get cleaned
930 * up by the next write or extattrctl clean.
931 */
932 printf("ufs_extattr_get (%s): inode number inconsistency (%d, %ju)\n",
933 mp->mnt_stat.f_mntonname, ueh.ueh_i_gen, (uintmax_t)ip->i_gen);
934 error = ENOATTR;
935 goto vopunlock_exit;
936 }
937
938 /* Local size consistency check. */
939 if (ueh.ueh_len > attribute->uele_fileheader.uef_size) {
940 error = ENXIO;
941 goto vopunlock_exit;
942 }
943
944 /* Return full data size if caller requested it. */
945 if (size != NULL)
946 *size = ueh.ueh_len;
947
948 /* Return data if the caller requested it. */
949 if (uio != NULL) {
950 /* Allow for offset into the attribute data. */
951 uio->uio_offset = base_offset + sizeof(struct
952 ufs_extattr_header);
953
954 /*
955 * Figure out maximum to transfer -- use buffer size and
956 * local data limit.
957 */
958 len = MIN(uio->uio_resid, ueh.ueh_len);
959 old_len = uio->uio_resid;
960 uio->uio_resid = len;
961
962 error = VOP_READ(attribute->uele_backing_vnode, uio,
963 IO_NODELOCKED, ump->um_extattr.uepm_ucred);
964 if (error)
965 goto vopunlock_exit;
966
967 uio->uio_resid = old_len - (len - uio->uio_resid);
968 }
969
970 vopunlock_exit:
971
972 if (uio != NULL)
973 uio->uio_offset = 0;
974
975 if (attribute->uele_backing_vnode != vp)
976 VOP_UNLOCK(attribute->uele_backing_vnode, 0);
977
978 return (error);
979 }
980
981 /*
982 * Vnode operation to remove a named attribute.
983 */
984 int
ufs_deleteextattr(struct vop_deleteextattr_args * ap)985 ufs_deleteextattr(struct vop_deleteextattr_args *ap)
986 /*
987 vop_deleteextattr {
988 IN struct vnode *a_vp;
989 IN int a_attrnamespace;
990 IN const char *a_name;
991 IN struct ucred *a_cred;
992 IN struct thread *a_td;
993 };
994 */
995 {
996 struct mount *mp = ap->a_vp->v_mount;
997 struct ufsmount *ump = VFSTOUFS(mp);
998 int error;
999
1000 ufs_extattr_uepm_lock(ump);
1001
1002 error = ufs_extattr_rm(ap->a_vp, ap->a_attrnamespace, ap->a_name,
1003 ap->a_cred, ap->a_td);
1004
1005
1006 ufs_extattr_uepm_unlock(ump);
1007
1008 return (error);
1009 }
1010
1011 /*
1012 * Vnode operation to set a named attribute.
1013 */
1014 int
ufs_setextattr(struct vop_setextattr_args * ap)1015 ufs_setextattr(struct vop_setextattr_args *ap)
1016 /*
1017 vop_setextattr {
1018 IN struct vnode *a_vp;
1019 IN int a_attrnamespace;
1020 IN const char *a_name;
1021 INOUT struct uio *a_uio;
1022 IN struct ucred *a_cred;
1023 IN struct thread *a_td;
1024 };
1025 */
1026 {
1027 struct mount *mp = ap->a_vp->v_mount;
1028 struct ufsmount *ump = VFSTOUFS(mp);
1029 int error;
1030
1031 /*
1032 * XXX: No longer a supported way to delete extended attributes.
1033 */
1034 if (ap->a_uio == NULL)
1035 return (EINVAL);
1036
1037 ufs_extattr_uepm_lock(ump);
1038
1039 error = ufs_extattr_set(ap->a_vp, ap->a_attrnamespace, ap->a_name,
1040 ap->a_uio, ap->a_cred, ap->a_td);
1041
1042 ufs_extattr_uepm_unlock(ump);
1043
1044 return (error);
1045 }
1046
1047 /*
1048 * Real work associated with setting a vnode's extended attributes;
1049 * assumes that the attribute lock has already been grabbed.
1050 */
1051 static int
ufs_extattr_set(struct vnode * vp,int attrnamespace,const char * name,struct uio * uio,struct ucred * cred,struct thread * td)1052 ufs_extattr_set(struct vnode *vp, int attrnamespace, const char *name,
1053 struct uio *uio, struct ucred *cred, struct thread *td)
1054 {
1055 struct ufs_extattr_list_entry *attribute;
1056 struct ufs_extattr_header ueh;
1057 struct iovec local_aiov;
1058 struct uio local_aio;
1059 struct mount *mp = vp->v_mount;
1060 struct ufsmount *ump = VFSTOUFS(mp);
1061 struct inode *ip = VTOI(vp);
1062 off_t base_offset;
1063 int error = 0, ioflag;
1064
1065 if (vp->v_mount->mnt_flag & MNT_RDONLY)
1066 return (EROFS);
1067 if (!(ump->um_extattr.uepm_flags & UFS_EXTATTR_UEPM_STARTED))
1068 return (EOPNOTSUPP);
1069 if (!ufs_extattr_valid_attrname(attrnamespace, name))
1070 return (EINVAL);
1071
1072 error = extattr_check_cred(vp, attrnamespace, cred, td, VWRITE);
1073 if (error)
1074 return (error);
1075
1076 attribute = ufs_extattr_find_attr(ump, attrnamespace, name);
1077 if (!attribute)
1078 return (ENOATTR);
1079
1080 /*
1081 * Early rejection of invalid offsets/length.
1082 * Reject: any offset but 0 (replace)
1083 * Any size greater than attribute size limit
1084 */
1085 if (uio->uio_offset != 0 ||
1086 uio->uio_resid > attribute->uele_fileheader.uef_size)
1087 return (ENXIO);
1088
1089 /*
1090 * Find base offset of header in file based on file header size, and
1091 * data header size + maximum data size, indexed by inode number.
1092 */
1093 base_offset = sizeof(struct ufs_extattr_fileheader) +
1094 ip->i_number * (sizeof(struct ufs_extattr_header) +
1095 attribute->uele_fileheader.uef_size);
1096
1097 /*
1098 * Write out a data header for the data.
1099 */
1100 ueh.ueh_len = uio->uio_resid;
1101 ueh.ueh_flags = UFS_EXTATTR_ATTR_FLAG_INUSE;
1102 ueh.ueh_i_gen = ip->i_gen;
1103 local_aiov.iov_base = (caddr_t) &ueh;
1104 local_aiov.iov_len = sizeof(struct ufs_extattr_header);
1105 local_aio.uio_iov = &local_aiov;
1106 local_aio.uio_iovcnt = 1;
1107 local_aio.uio_rw = UIO_WRITE;
1108 local_aio.uio_segflg = UIO_SYSSPACE;
1109 local_aio.uio_td = td;
1110 local_aio.uio_offset = base_offset;
1111 local_aio.uio_resid = sizeof(struct ufs_extattr_header);
1112
1113 /*
1114 * Acquire locks.
1115 *
1116 * Don't need to get a lock on the backing file if the setattr is
1117 * being applied to the backing file, as the lock is already held.
1118 */
1119 if (attribute->uele_backing_vnode != vp)
1120 vn_lock(attribute->uele_backing_vnode, LK_EXCLUSIVE | LK_RETRY);
1121
1122 ioflag = IO_NODELOCKED;
1123 if (ufs_extattr_sync)
1124 ioflag |= IO_SYNC;
1125 error = VOP_WRITE(attribute->uele_backing_vnode, &local_aio, ioflag,
1126 ump->um_extattr.uepm_ucred);
1127 if (error)
1128 goto vopunlock_exit;
1129
1130 if (local_aio.uio_resid != 0) {
1131 error = ENXIO;
1132 goto vopunlock_exit;
1133 }
1134
1135 /*
1136 * Write out user data.
1137 */
1138 uio->uio_offset = base_offset + sizeof(struct ufs_extattr_header);
1139
1140 ioflag = IO_NODELOCKED;
1141 if (ufs_extattr_sync)
1142 ioflag |= IO_SYNC;
1143 error = VOP_WRITE(attribute->uele_backing_vnode, uio, ioflag,
1144 ump->um_extattr.uepm_ucred);
1145
1146 vopunlock_exit:
1147 uio->uio_offset = 0;
1148
1149 if (attribute->uele_backing_vnode != vp)
1150 VOP_UNLOCK(attribute->uele_backing_vnode, 0);
1151
1152 return (error);
1153 }
1154
1155 /*
1156 * Real work associated with removing an extended attribute from a vnode.
1157 * Assumes the attribute lock has already been grabbed.
1158 */
1159 static int
ufs_extattr_rm(struct vnode * vp,int attrnamespace,const char * name,struct ucred * cred,struct thread * td)1160 ufs_extattr_rm(struct vnode *vp, int attrnamespace, const char *name,
1161 struct ucred *cred, struct thread *td)
1162 {
1163 struct ufs_extattr_list_entry *attribute;
1164 struct ufs_extattr_header ueh;
1165 struct iovec local_aiov;
1166 struct uio local_aio;
1167 struct mount *mp = vp->v_mount;
1168 struct ufsmount *ump = VFSTOUFS(mp);
1169 struct inode *ip = VTOI(vp);
1170 off_t base_offset;
1171 int error = 0, ioflag;
1172
1173 if (vp->v_mount->mnt_flag & MNT_RDONLY)
1174 return (EROFS);
1175 if (!(ump->um_extattr.uepm_flags & UFS_EXTATTR_UEPM_STARTED))
1176 return (EOPNOTSUPP);
1177 if (!ufs_extattr_valid_attrname(attrnamespace, name))
1178 return (EINVAL);
1179
1180 error = extattr_check_cred(vp, attrnamespace, cred, td, VWRITE);
1181 if (error)
1182 return (error);
1183
1184 attribute = ufs_extattr_find_attr(ump, attrnamespace, name);
1185 if (!attribute)
1186 return (ENOATTR);
1187
1188 /*
1189 * Find base offset of header in file based on file header size, and
1190 * data header size + maximum data size, indexed by inode number.
1191 */
1192 base_offset = sizeof(struct ufs_extattr_fileheader) +
1193 ip->i_number * (sizeof(struct ufs_extattr_header) +
1194 attribute->uele_fileheader.uef_size);
1195
1196 /*
1197 * Check to see if currently defined.
1198 */
1199 bzero(&ueh, sizeof(struct ufs_extattr_header));
1200
1201 local_aiov.iov_base = (caddr_t) &ueh;
1202 local_aiov.iov_len = sizeof(struct ufs_extattr_header);
1203 local_aio.uio_iov = &local_aiov;
1204 local_aio.uio_iovcnt = 1;
1205 local_aio.uio_rw = UIO_READ;
1206 local_aio.uio_segflg = UIO_SYSSPACE;
1207 local_aio.uio_td = td;
1208 local_aio.uio_offset = base_offset;
1209 local_aio.uio_resid = sizeof(struct ufs_extattr_header);
1210
1211 /*
1212 * Don't need to get the lock on the backing vnode if the vnode we're
1213 * modifying is it, as we already hold the lock.
1214 */
1215 if (attribute->uele_backing_vnode != vp)
1216 vn_lock(attribute->uele_backing_vnode, LK_EXCLUSIVE | LK_RETRY);
1217
1218 error = VOP_READ(attribute->uele_backing_vnode, &local_aio,
1219 IO_NODELOCKED, ump->um_extattr.uepm_ucred);
1220 if (error)
1221 goto vopunlock_exit;
1222
1223 /* Defined? */
1224 if ((ueh.ueh_flags & UFS_EXTATTR_ATTR_FLAG_INUSE) == 0) {
1225 error = ENOATTR;
1226 goto vopunlock_exit;
1227 }
1228
1229 /* Valid for the current inode generation? */
1230 if (ueh.ueh_i_gen != ip->i_gen) {
1231 /*
1232 * The inode itself has a different generation number than
1233 * the attribute data. For now, the best solution is to
1234 * coerce this to undefined, and let it get cleaned up by
1235 * the next write or extattrctl clean.
1236 */
1237 printf("ufs_extattr_rm (%s): inode number inconsistency (%d, %jd)\n",
1238 mp->mnt_stat.f_mntonname, ueh.ueh_i_gen, (intmax_t)ip->i_gen);
1239 error = ENOATTR;
1240 goto vopunlock_exit;
1241 }
1242
1243 /* Flag it as not in use. */
1244 ueh.ueh_flags = 0;
1245 ueh.ueh_len = 0;
1246
1247 local_aiov.iov_base = (caddr_t) &ueh;
1248 local_aiov.iov_len = sizeof(struct ufs_extattr_header);
1249 local_aio.uio_iov = &local_aiov;
1250 local_aio.uio_iovcnt = 1;
1251 local_aio.uio_rw = UIO_WRITE;
1252 local_aio.uio_segflg = UIO_SYSSPACE;
1253 local_aio.uio_td = td;
1254 local_aio.uio_offset = base_offset;
1255 local_aio.uio_resid = sizeof(struct ufs_extattr_header);
1256
1257 ioflag = IO_NODELOCKED;
1258 if (ufs_extattr_sync)
1259 ioflag |= IO_SYNC;
1260 error = VOP_WRITE(attribute->uele_backing_vnode, &local_aio, ioflag,
1261 ump->um_extattr.uepm_ucred);
1262 if (error)
1263 goto vopunlock_exit;
1264
1265 if (local_aio.uio_resid != 0)
1266 error = ENXIO;
1267
1268 vopunlock_exit:
1269 VOP_UNLOCK(attribute->uele_backing_vnode, 0);
1270
1271 return (error);
1272 }
1273
1274 /*
1275 * Called by UFS when an inode is no longer active and should have its
1276 * attributes stripped.
1277 */
1278 void
ufs_extattr_vnode_inactive(struct vnode * vp,struct thread * td)1279 ufs_extattr_vnode_inactive(struct vnode *vp, struct thread *td)
1280 {
1281 struct ufs_extattr_list_entry *uele;
1282 struct mount *mp = vp->v_mount;
1283 struct ufsmount *ump = VFSTOUFS(mp);
1284
1285 /*
1286 * In that case, we cannot lock. We should not have any active vnodes
1287 * on the fs if this is not yet initialized but is going to be, so
1288 * this can go unlocked.
1289 */
1290 if (!(ump->um_extattr.uepm_flags & UFS_EXTATTR_UEPM_INITIALIZED))
1291 return;
1292
1293 ufs_extattr_uepm_lock(ump);
1294
1295 if (!(ump->um_extattr.uepm_flags & UFS_EXTATTR_UEPM_STARTED)) {
1296 ufs_extattr_uepm_unlock(ump);
1297 return;
1298 }
1299
1300 LIST_FOREACH(uele, &ump->um_extattr.uepm_list, uele_entries)
1301 ufs_extattr_rm(vp, uele->uele_attrnamespace,
1302 uele->uele_attrname, NULL, td);
1303
1304 ufs_extattr_uepm_unlock(ump);
1305 }
1306
1307 #endif /* !UFS_EXTATTR */
1308