| 1 | /* $NetBSD: ufs_extattr.c,v 1.48 2016/11/09 05:08:35 dholland Exp $ */ |
| 2 | |
| 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 file system extended attributes on the UFS1 file system. |
| 40 | * |
| 41 | * Extended attributes are defined in the form name=value, where name is |
| 42 | * a nul-terminated string in the style of a file name, and value is a |
| 43 | * binary blob of zero or more bytes. The UFS1 extended attribute service |
| 44 | * layers support for extended attributes onto a backing file, in the style |
| 45 | * of the quota implementation, meaning that it requires no underlying format |
| 46 | * changes to the file system. This design choice exchanges simplicity, |
| 47 | * usability, and easy deployment for performance. |
| 48 | */ |
| 49 | |
| 50 | #include <sys/cdefs.h> |
| 51 | __KERNEL_RCSID(0, "$NetBSD: ufs_extattr.c,v 1.48 2016/11/09 05:08:35 dholland Exp $" ); |
| 52 | |
| 53 | #ifdef _KERNEL_OPT |
| 54 | #include "opt_ffs.h" |
| 55 | #endif |
| 56 | |
| 57 | #include <sys/param.h> |
| 58 | #include <sys/systm.h> |
| 59 | #include <sys/reboot.h> |
| 60 | #include <sys/kauth.h> |
| 61 | #include <sys/kernel.h> |
| 62 | #include <sys/namei.h> |
| 63 | #include <sys/kmem.h> |
| 64 | #include <sys/fcntl.h> |
| 65 | #include <sys/lwp.h> |
| 66 | #include <sys/vnode.h> |
| 67 | #include <sys/mount.h> |
| 68 | #include <sys/lock.h> |
| 69 | #include <sys/dirent.h> |
| 70 | #include <sys/extattr.h> |
| 71 | #include <sys/sysctl.h> |
| 72 | |
| 73 | #include <ufs/ufs/dir.h> |
| 74 | #include <ufs/ufs/extattr.h> |
| 75 | #include <ufs/ufs/ufsmount.h> |
| 76 | #include <ufs/ufs/inode.h> |
| 77 | #include <ufs/ufs/ufs_bswap.h> |
| 78 | #include <ufs/ufs/ufs_extern.h> |
| 79 | |
| 80 | int ufs_extattr_sync = 1; |
| 81 | int ufs_extattr_autocreate = 1024; |
| 82 | |
| 83 | static int ufs_extattr_valid_attrname(int attrnamespace, |
| 84 | const char *attrname); |
| 85 | static int ufs_extattr_enable_with_open(struct ufsmount *ump, |
| 86 | struct vnode *vp, int attrnamespace, const char *attrname, |
| 87 | struct lwp *l); |
| 88 | static int ufs_extattr_enable(struct ufsmount *ump, int attrnamespace, |
| 89 | const char *attrname, struct vnode *backing_vnode, |
| 90 | struct lwp *l); |
| 91 | static int ufs_extattr_disable(struct ufsmount *ump, int attrnamespace, |
| 92 | const char *attrname, struct lwp *l); |
| 93 | static int ufs_extattr_get(struct vnode *vp, int attrnamespace, |
| 94 | const char *name, struct uio *uio, size_t *size, |
| 95 | kauth_cred_t cred, struct lwp *l); |
| 96 | static int ufs_extattr_list(struct vnode *vp, int attrnamespace, |
| 97 | struct uio *uio, size_t *size, int flag, |
| 98 | kauth_cred_t cred, struct lwp *l); |
| 99 | static int ufs_extattr_set(struct vnode *vp, int attrnamespace, |
| 100 | const char *name, struct uio *uio, kauth_cred_t cred, |
| 101 | struct lwp *l); |
| 102 | static int ufs_extattr_rm(struct vnode *vp, int attrnamespace, |
| 103 | const char *name, kauth_cred_t cred, struct lwp *l); |
| 104 | static struct ufs_extattr_list_entry *ufs_extattr_find_attr(struct ufsmount *, |
| 105 | int, const char *); |
| 106 | static int ufs_extattr_get_header(struct vnode *, |
| 107 | struct ufs_extattr_list_entry *, |
| 108 | struct ufs_extattr_header *, off_t *); |
| 109 | |
| 110 | /* |
| 111 | * Convert a FreeBSD extended attribute and namespace to a consistent string |
| 112 | * representation. |
| 113 | * |
| 114 | * The returned value, if not NULL, is guaranteed to be an allocated object |
| 115 | * of its size as returned by strlen() + 1 and must be freed by the caller. |
| 116 | */ |
| 117 | static char * |
| 118 | from_freebsd_extattr(int attrnamespace, const char *attrname) |
| 119 | { |
| 120 | const char *namespace; |
| 121 | char *attr; |
| 122 | size_t len; |
| 123 | |
| 124 | if (attrnamespace == EXTATTR_NAMESPACE_SYSTEM) |
| 125 | namespace = "system" ; |
| 126 | else if (attrnamespace == EXTATTR_NAMESPACE_USER) |
| 127 | namespace = "user" ; |
| 128 | else |
| 129 | return NULL; |
| 130 | |
| 131 | /* <namespace>.<attrname>\0 */ |
| 132 | len = strlen(namespace) + 1 + strlen(attrname) + 1; |
| 133 | |
| 134 | attr = kmem_alloc(len, KM_SLEEP); |
| 135 | |
| 136 | snprintf(attr, len, "%s.%s" , namespace, attrname); |
| 137 | |
| 138 | return attr; |
| 139 | } |
| 140 | |
| 141 | /* |
| 142 | * Internal wrapper around a conversion-check-free sequence. |
| 143 | */ |
| 144 | static int |
| 145 | internal_extattr_check_cred(vnode_t *vp, int attrnamespace, const char *name, |
| 146 | kauth_cred_t cred, int access_mode) |
| 147 | { |
| 148 | char *attr; |
| 149 | int error; |
| 150 | |
| 151 | attr = from_freebsd_extattr(attrnamespace, name); |
| 152 | if (attr == NULL) |
| 153 | return EINVAL; |
| 154 | |
| 155 | error = extattr_check_cred(vp, attr, cred, access_mode); |
| 156 | |
| 157 | kmem_free(attr, strlen(attr) + 1); |
| 158 | |
| 159 | return error; |
| 160 | } |
| 161 | |
| 162 | /* |
| 163 | * Per-FS attribute lock protecting attribute operations. |
| 164 | * XXX Right now there is a lot of lock contention due to having a single |
| 165 | * lock per-FS; really, this should be far more fine-grained. |
| 166 | */ |
| 167 | static void |
| 168 | ufs_extattr_uepm_lock(struct ufsmount *ump) |
| 169 | { |
| 170 | |
| 171 | /* |
| 172 | * XXX This needs to be recursive for the following reasons: |
| 173 | * - it is taken in ufs_extattr_vnode_inactive |
| 174 | * - which is called from VOP_INACTIVE |
| 175 | * - which can be triggered by any vrele, vput, or vn_close |
| 176 | * - several of these can happen while it's held |
| 177 | */ |
| 178 | if (mutex_owned(&ump->um_extattr.uepm_lock)) { |
| 179 | ump->um_extattr.uepm_lockcnt++; |
| 180 | return; |
| 181 | } |
| 182 | mutex_enter(&ump->um_extattr.uepm_lock); |
| 183 | } |
| 184 | |
| 185 | static void |
| 186 | ufs_extattr_uepm_unlock(struct ufsmount *ump) |
| 187 | { |
| 188 | |
| 189 | if (ump->um_extattr.uepm_lockcnt != 0) { |
| 190 | KASSERT(mutex_owned(&ump->um_extattr.uepm_lock)); |
| 191 | ump->um_extattr.uepm_lockcnt--; |
| 192 | return; |
| 193 | } |
| 194 | mutex_exit(&ump->um_extattr.uepm_lock); |
| 195 | } |
| 196 | |
| 197 | /*- |
| 198 | * Determine whether the name passed is a valid name for an actual |
| 199 | * attribute. |
| 200 | * |
| 201 | * Invalid currently consists of: |
| 202 | * NULL pointer for attrname |
| 203 | * zero-length attrname (used to retrieve application attribute list) |
| 204 | */ |
| 205 | static int |
| 206 | ufs_extattr_valid_attrname(int attrnamespace, const char *attrname) |
| 207 | { |
| 208 | |
| 209 | if (attrname == NULL) |
| 210 | return (0); |
| 211 | if (strlen(attrname) == 0) |
| 212 | return (0); |
| 213 | return (1); |
| 214 | } |
| 215 | |
| 216 | /* |
| 217 | * Autocreate an attribute storage |
| 218 | */ |
| 219 | static int |
| 220 | ufs_extattr_autocreate_attr(struct vnode *vp, int attrnamespace, |
| 221 | const char *attrname, struct lwp *l, struct ufs_extattr_list_entry **uelep) |
| 222 | { |
| 223 | struct mount *mp = vp->v_mount; |
| 224 | struct ufsmount *ump = VFSTOUFS(mp); |
| 225 | struct vnode *backing_vp; |
| 226 | struct nameidata nd; |
| 227 | struct pathbuf *pb; |
| 228 | char *path; |
| 229 | struct ufs_extattr_fileheader uef; |
| 230 | struct ufs_extattr_list_entry *uele; |
| 231 | int error; |
| 232 | |
| 233 | path = PNBUF_GET(); |
| 234 | |
| 235 | /* |
| 236 | * We only support system and user namespace autocreation |
| 237 | */ |
| 238 | switch (attrnamespace) { |
| 239 | case EXTATTR_NAMESPACE_SYSTEM: |
| 240 | (void)snprintf(path, PATH_MAX, "%s/%s/%s/%s" , |
| 241 | mp->mnt_stat.f_mntonname, |
| 242 | UFS_EXTATTR_FSROOTSUBDIR, |
| 243 | UFS_EXTATTR_SUBDIR_SYSTEM, |
| 244 | attrname); |
| 245 | break; |
| 246 | case EXTATTR_NAMESPACE_USER: |
| 247 | (void)snprintf(path, PATH_MAX, "%s/%s/%s/%s" , |
| 248 | mp->mnt_stat.f_mntonname, |
| 249 | UFS_EXTATTR_FSROOTSUBDIR, |
| 250 | UFS_EXTATTR_SUBDIR_USER, |
| 251 | attrname); |
| 252 | break; |
| 253 | default: |
| 254 | PNBUF_PUT(path); |
| 255 | *uelep = NULL; |
| 256 | return EINVAL; |
| 257 | break; |
| 258 | } |
| 259 | |
| 260 | /* |
| 261 | * Release extended attribute mount lock, otherwise |
| 262 | * we can deadlock with another thread that would lock |
| 263 | * vp after we unlock it below, and call |
| 264 | * ufs_extattr_uepm_lock(ump), for instance |
| 265 | * in ufs_getextattr(). |
| 266 | */ |
| 267 | ufs_extattr_uepm_unlock(ump); |
| 268 | |
| 269 | /* |
| 270 | * XXX unlock/lock should only be done when setting extattr |
| 271 | * on backing store or one of its parent directory |
| 272 | * including root, but we always do it for now. |
| 273 | */ |
| 274 | KASSERT(VOP_ISLOCKED(vp) == LK_EXCLUSIVE); |
| 275 | VOP_UNLOCK(vp); |
| 276 | |
| 277 | pb = pathbuf_create(path); |
| 278 | NDINIT(&nd, CREATE, LOCKPARENT, pb); |
| 279 | |
| 280 | /* |
| 281 | * Since we do not hold ufs_extattr_uepm_lock anymore, |
| 282 | * another thread may race with us for backend creation, |
| 283 | * but only one can succeed here thanks to O_EXCL |
| 284 | */ |
| 285 | error = vn_open(&nd, O_CREAT|O_EXCL|O_RDWR, 0600); |
| 286 | |
| 287 | /* |
| 288 | * Reacquire the lock on the vnode |
| 289 | */ |
| 290 | KASSERT(VOP_ISLOCKED(vp) == 0); |
| 291 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); |
| 292 | |
| 293 | ufs_extattr_uepm_lock(ump); |
| 294 | |
| 295 | if (error != 0) { |
| 296 | pathbuf_destroy(pb); |
| 297 | PNBUF_PUT(path); |
| 298 | *uelep = NULL; |
| 299 | return error; |
| 300 | } |
| 301 | |
| 302 | KASSERT(nd.ni_vp != NULL); |
| 303 | KASSERT(VOP_ISLOCKED(nd.ni_vp) == LK_EXCLUSIVE); |
| 304 | KASSERT(VOP_ISLOCKED(nd.ni_dvp) == 0); |
| 305 | |
| 306 | /* |
| 307 | * backing_vp is the backing store. |
| 308 | */ |
| 309 | backing_vp = nd.ni_vp; |
| 310 | pathbuf_destroy(pb); |
| 311 | PNBUF_PUT(path); |
| 312 | |
| 313 | uef.uef_magic = UFS_EXTATTR_MAGIC; |
| 314 | uef.uef_version = UFS_EXTATTR_VERSION; |
| 315 | uef.uef_size = ufs_extattr_autocreate; |
| 316 | |
| 317 | error = vn_rdwr(UIO_WRITE, backing_vp, &uef, sizeof(uef), 0, |
| 318 | UIO_SYSSPACE, IO_NODELOCKED|IO_APPEND, |
| 319 | l->l_cred, NULL, l); |
| 320 | |
| 321 | VOP_UNLOCK(backing_vp); |
| 322 | |
| 323 | if (error != 0) { |
| 324 | printf("%s: write uef header failed for %s, error = %d\n" , |
| 325 | __func__, attrname, error); |
| 326 | vn_close(backing_vp, FREAD|FWRITE, l->l_cred); |
| 327 | *uelep = NULL; |
| 328 | return error; |
| 329 | } |
| 330 | |
| 331 | /* |
| 332 | * Now enable attribute. |
| 333 | */ |
| 334 | error = ufs_extattr_enable(ump,attrnamespace, attrname, backing_vp, l); |
| 335 | KASSERT(VOP_ISLOCKED(backing_vp) == 0); |
| 336 | |
| 337 | if (error != 0) { |
| 338 | printf("%s: enable %s failed, error %d\n" , |
| 339 | __func__, attrname, error); |
| 340 | vn_close(backing_vp, FREAD|FWRITE, l->l_cred); |
| 341 | *uelep = NULL; |
| 342 | return error; |
| 343 | } |
| 344 | |
| 345 | uele = ufs_extattr_find_attr(ump, attrnamespace, attrname); |
| 346 | if (uele == NULL) { |
| 347 | printf("%s: atttribute %s created but not found!\n" , |
| 348 | __func__, attrname); |
| 349 | vn_close(backing_vp, FREAD|FWRITE, l->l_cred); |
| 350 | *uelep = NULL; |
| 351 | return ESRCH; /* really internal error */ |
| 352 | } |
| 353 | |
| 354 | printf("%s: EA backing store autocreated for %s\n" , |
| 355 | mp->mnt_stat.f_mntonname, attrname); |
| 356 | |
| 357 | *uelep = uele; |
| 358 | return 0; |
| 359 | } |
| 360 | |
| 361 | /* |
| 362 | * Locate an attribute given a name and mountpoint. |
| 363 | * Must be holding uepm lock for the mount point. |
| 364 | */ |
| 365 | static struct ufs_extattr_list_entry * |
| 366 | ufs_extattr_find_attr(struct ufsmount *ump, int attrnamespace, |
| 367 | const char *attrname) |
| 368 | { |
| 369 | struct ufs_extattr_list_entry *search_attribute; |
| 370 | |
| 371 | for (search_attribute = LIST_FIRST(&ump->um_extattr.uepm_list); |
| 372 | search_attribute != NULL; |
| 373 | search_attribute = LIST_NEXT(search_attribute, uele_entries)) { |
| 374 | if (!(strncmp(attrname, search_attribute->uele_attrname, |
| 375 | UFS_EXTATTR_MAXEXTATTRNAME)) && |
| 376 | (attrnamespace == search_attribute->uele_attrnamespace)) { |
| 377 | return (search_attribute); |
| 378 | } |
| 379 | } |
| 380 | |
| 381 | return (0); |
| 382 | } |
| 383 | |
| 384 | /* |
| 385 | * Initialize per-FS structures supporting extended attributes. Do not |
| 386 | * start extended attributes yet. |
| 387 | */ |
| 388 | void |
| 389 | ufs_extattr_uepm_init(struct ufs_extattr_per_mount *uepm) |
| 390 | { |
| 391 | |
| 392 | uepm->uepm_flags = 0; |
| 393 | uepm->uepm_lockcnt = 0; |
| 394 | |
| 395 | LIST_INIT(&uepm->uepm_list); |
| 396 | mutex_init(&uepm->uepm_lock, MUTEX_DEFAULT, IPL_NONE); |
| 397 | uepm->uepm_flags |= UFS_EXTATTR_UEPM_INITIALIZED; |
| 398 | } |
| 399 | |
| 400 | /* |
| 401 | * Destroy per-FS structures supporting extended attributes. Assumes |
| 402 | * that EAs have already been stopped, and will panic if not. |
| 403 | */ |
| 404 | void |
| 405 | ufs_extattr_uepm_destroy(struct ufs_extattr_per_mount *uepm) |
| 406 | { |
| 407 | |
| 408 | if (!(uepm->uepm_flags & UFS_EXTATTR_UEPM_INITIALIZED)) |
| 409 | panic("ufs_extattr_uepm_destroy: not initialized" ); |
| 410 | |
| 411 | if ((uepm->uepm_flags & UFS_EXTATTR_UEPM_STARTED)) |
| 412 | panic("ufs_extattr_uepm_destroy: called while still started" ); |
| 413 | |
| 414 | /* |
| 415 | * It's not clear that either order for the next three lines is |
| 416 | * ideal, and it should never be a problem if this is only called |
| 417 | * during unmount, and with vfs_busy(). |
| 418 | */ |
| 419 | uepm->uepm_flags &= ~UFS_EXTATTR_UEPM_STARTED; |
| 420 | uepm->uepm_flags &= ~UFS_EXTATTR_UEPM_INITIALIZED; |
| 421 | mutex_destroy(&uepm->uepm_lock); |
| 422 | } |
| 423 | |
| 424 | /* |
| 425 | * Start extended attribute support on an FS. |
| 426 | */ |
| 427 | int |
| 428 | ufs_extattr_start(struct mount *mp, struct lwp *l) |
| 429 | { |
| 430 | struct ufsmount *ump; |
| 431 | int error = 0; |
| 432 | |
| 433 | ump = VFSTOUFS(mp); |
| 434 | |
| 435 | if (!(ump->um_extattr.uepm_flags & UFS_EXTATTR_UEPM_INITIALIZED)) |
| 436 | ufs_extattr_uepm_init(&ump->um_extattr); |
| 437 | |
| 438 | ufs_extattr_uepm_lock(ump); |
| 439 | |
| 440 | if (!(ump->um_extattr.uepm_flags & UFS_EXTATTR_UEPM_INITIALIZED)) { |
| 441 | error = EOPNOTSUPP; |
| 442 | goto unlock; |
| 443 | } |
| 444 | if (ump->um_extattr.uepm_flags & UFS_EXTATTR_UEPM_STARTED) { |
| 445 | error = EBUSY; |
| 446 | goto unlock; |
| 447 | } |
| 448 | |
| 449 | ump->um_extattr.uepm_flags |= UFS_EXTATTR_UEPM_STARTED; |
| 450 | |
| 451 | ump->um_extattr.uepm_ucred = l->l_cred; |
| 452 | kauth_cred_hold(ump->um_extattr.uepm_ucred); |
| 453 | |
| 454 | unlock: |
| 455 | ufs_extattr_uepm_unlock(ump); |
| 456 | |
| 457 | return (error); |
| 458 | } |
| 459 | |
| 460 | /* |
| 461 | * Helper routine: given a locked parent directory and filename, return |
| 462 | * the locked vnode of the inode associated with the name. Will not |
| 463 | * follow symlinks, may return any type of vnode. Lock on parent will |
| 464 | * be released even in the event of a failure. In the event that the |
| 465 | * target is the parent (i.e., "."), there will be two references and |
| 466 | * one lock, requiring the caller to possibly special-case. |
| 467 | */ |
| 468 | static int |
| 469 | ufs_extattr_lookup(struct vnode *start_dvp, int lockparent, const char *dirname, |
| 470 | struct vnode **vp, struct lwp *l) |
| 471 | { |
| 472 | struct vop_lookup_v2_args vargs; |
| 473 | struct componentname cnp; |
| 474 | struct vnode *target_vp; |
| 475 | char *pnbuf; |
| 476 | int error; |
| 477 | |
| 478 | KASSERT(VOP_ISLOCKED(start_dvp) == LK_EXCLUSIVE); |
| 479 | |
| 480 | pnbuf = PNBUF_GET(); |
| 481 | |
| 482 | memset(&cnp, 0, sizeof(cnp)); |
| 483 | cnp.cn_nameiop = LOOKUP; |
| 484 | cnp.cn_flags = ISLASTCN | lockparent; |
| 485 | cnp.cn_cred = l->l_cred; |
| 486 | cnp.cn_nameptr = pnbuf; |
| 487 | error = copystr(dirname, pnbuf, MAXPATHLEN, &cnp.cn_namelen); |
| 488 | if (error) { |
| 489 | if (lockparent == 0) { |
| 490 | VOP_UNLOCK(start_dvp); |
| 491 | } |
| 492 | PNBUF_PUT(pnbuf); |
| 493 | printf("ufs_extattr_lookup: copystr failed\n" ); |
| 494 | return (error); |
| 495 | } |
| 496 | cnp.cn_namelen--; /* trim nul termination */ |
| 497 | vargs.a_desc = NULL; |
| 498 | vargs.a_dvp = start_dvp; |
| 499 | vargs.a_vpp = &target_vp; |
| 500 | vargs.a_cnp = &cnp; |
| 501 | error = ufs_lookup(&vargs); |
| 502 | PNBUF_PUT(pnbuf); |
| 503 | if (error) { |
| 504 | if (lockparent == 0) { |
| 505 | VOP_UNLOCK(start_dvp); |
| 506 | } |
| 507 | return (error); |
| 508 | } |
| 509 | #if 0 |
| 510 | if (target_vp == start_dvp) |
| 511 | panic("ufs_extattr_lookup: target_vp == start_dvp" ); |
| 512 | #endif |
| 513 | |
| 514 | if (target_vp != start_dvp) { |
| 515 | error = vn_lock(target_vp, LK_EXCLUSIVE); |
| 516 | if (lockparent == 0) |
| 517 | VOP_UNLOCK(start_dvp); |
| 518 | if (error) { |
| 519 | vrele(target_vp); |
| 520 | return error; |
| 521 | } |
| 522 | } |
| 523 | |
| 524 | KASSERT(VOP_ISLOCKED(target_vp) == LK_EXCLUSIVE); |
| 525 | *vp = target_vp; |
| 526 | return (0); |
| 527 | } |
| 528 | |
| 529 | /* |
| 530 | * Enable an EA using the passed filesystem, backing vnode, attribute name, |
| 531 | * namespace, and proc. Will perform a VOP_OPEN() on the vp, so expects vp |
| 532 | * to be locked when passed in. The vnode will be returned unlocked, |
| 533 | * regardless of success/failure of the function. As a result, the caller |
| 534 | * will always need to vrele(), but not vput(). |
| 535 | */ |
| 536 | static int |
| 537 | ufs_extattr_enable_with_open(struct ufsmount *ump, struct vnode *vp, |
| 538 | int attrnamespace, const char *attrname, struct lwp *l) |
| 539 | { |
| 540 | int error; |
| 541 | |
| 542 | error = VOP_OPEN(vp, FREAD|FWRITE, l->l_cred); |
| 543 | if (error) { |
| 544 | printf("ufs_extattr_enable_with_open.VOP_OPEN(): failed " |
| 545 | "with %d\n" , error); |
| 546 | VOP_UNLOCK(vp); |
| 547 | return (error); |
| 548 | } |
| 549 | |
| 550 | mutex_enter(vp->v_interlock); |
| 551 | vp->v_writecount++; |
| 552 | mutex_exit(vp->v_interlock); |
| 553 | |
| 554 | vref(vp); |
| 555 | |
| 556 | VOP_UNLOCK(vp); |
| 557 | |
| 558 | error = ufs_extattr_enable(ump, attrnamespace, attrname, vp, l); |
| 559 | if (error != 0) |
| 560 | vn_close(vp, FREAD|FWRITE, l->l_cred); |
| 561 | return (error); |
| 562 | } |
| 563 | |
| 564 | /* |
| 565 | * Given a locked directory vnode, iterate over the names in the directory |
| 566 | * and use ufs_extattr_lookup() to retrieve locked vnodes of potential |
| 567 | * attribute files. Then invoke ufs_extattr_enable_with_open() on each |
| 568 | * to attempt to start the attribute. Leaves the directory locked on |
| 569 | * exit. |
| 570 | */ |
| 571 | static int |
| 572 | ufs_extattr_iterate_directory(struct ufsmount *ump, struct vnode *dvp, |
| 573 | int attrnamespace, struct lwp *l) |
| 574 | { |
| 575 | struct vop_readdir_args vargs; |
| 576 | struct statvfs *sbp = &ump->um_mountp->mnt_stat; |
| 577 | struct dirent *dp, *edp; |
| 578 | struct vnode *attr_vp; |
| 579 | struct uio auio; |
| 580 | struct iovec aiov; |
| 581 | char *dirbuf; |
| 582 | int error, eofflag = 0; |
| 583 | |
| 584 | if (dvp->v_type != VDIR) |
| 585 | return (ENOTDIR); |
| 586 | |
| 587 | dirbuf = kmem_alloc(UFS_DIRBLKSIZ, KM_SLEEP); |
| 588 | |
| 589 | auio.uio_iov = &aiov; |
| 590 | auio.uio_iovcnt = 1; |
| 591 | auio.uio_rw = UIO_READ; |
| 592 | auio.uio_offset = 0; |
| 593 | UIO_SETUP_SYSSPACE(&auio); |
| 594 | |
| 595 | vargs.a_desc = NULL; |
| 596 | vargs.a_vp = dvp; |
| 597 | vargs.a_uio = &auio; |
| 598 | vargs.a_cred = l->l_cred; |
| 599 | vargs.a_eofflag = &eofflag; |
| 600 | vargs.a_ncookies = NULL; |
| 601 | vargs.a_cookies = NULL; |
| 602 | |
| 603 | while (!eofflag) { |
| 604 | auio.uio_resid = UFS_DIRBLKSIZ; |
| 605 | aiov.iov_base = dirbuf; |
| 606 | aiov.iov_len = UFS_DIRBLKSIZ; |
| 607 | error = ufs_readdir(&vargs); |
| 608 | if (error) { |
| 609 | printf("ufs_extattr_iterate_directory: ufs_readdir " |
| 610 | "%d\n" , error); |
| 611 | return (error); |
| 612 | } |
| 613 | |
| 614 | /* |
| 615 | * XXXRW: While in UFS, we always get UFS_DIRBLKSIZ returns from |
| 616 | * the directory code on success, on other file systems this |
| 617 | * may not be the case. For portability, we should check the |
| 618 | * read length on return from ufs_readdir(). |
| 619 | */ |
| 620 | edp = (struct dirent *)&dirbuf[UFS_DIRBLKSIZ]; |
| 621 | for (dp = (struct dirent *)dirbuf; dp < edp; ) { |
| 622 | if (dp->d_reclen == 0) |
| 623 | break; |
| 624 | /* Skip "." and ".." */ |
| 625 | if (dp->d_name[0] == '.' && |
| 626 | (dp->d_name[1] == '\0' || |
| 627 | (dp->d_name[1] == '.' && dp->d_name[2] == '\0'))) |
| 628 | goto next; |
| 629 | error = ufs_extattr_lookup(dvp, LOCKPARENT, |
| 630 | dp->d_name, &attr_vp, l); |
| 631 | if (error == ENOENT) { |
| 632 | goto next; /* keep silent */ |
| 633 | } else if (error) { |
| 634 | printf("ufs_extattr_iterate_directory: lookup " |
| 635 | "%s %d\n" , dp->d_name, error); |
| 636 | } else if (attr_vp == dvp) { |
| 637 | vrele(attr_vp); |
| 638 | } else if (attr_vp->v_type != VREG) { |
| 639 | vput(attr_vp); |
| 640 | } else { |
| 641 | error = ufs_extattr_enable_with_open(ump, |
| 642 | attr_vp, attrnamespace, dp->d_name, l); |
| 643 | vrele(attr_vp); |
| 644 | if (error) { |
| 645 | printf("ufs_extattr_iterate_directory: " |
| 646 | "enable %s %d\n" , dp->d_name, |
| 647 | error); |
| 648 | } else if (bootverbose) { |
| 649 | printf("%s: EA %s loaded\n" , |
| 650 | sbp->f_mntonname, dp->d_name); |
| 651 | } |
| 652 | } |
| 653 | next: |
| 654 | dp = (struct dirent *) ((char *)dp + dp->d_reclen); |
| 655 | if (dp >= edp) |
| 656 | break; |
| 657 | } |
| 658 | } |
| 659 | kmem_free(dirbuf, UFS_DIRBLKSIZ); |
| 660 | |
| 661 | return (0); |
| 662 | } |
| 663 | |
| 664 | /* |
| 665 | * Auto-start of extended attributes, to be executed (optionally) at |
| 666 | * mount-time. |
| 667 | */ |
| 668 | int |
| 669 | ufs_extattr_autostart(struct mount *mp, struct lwp *l) |
| 670 | { |
| 671 | struct vnode *rvp, *attr_dvp, *attr_system_dvp, *attr_user_dvp; |
| 672 | int error; |
| 673 | |
| 674 | /* |
| 675 | * Does UFS_EXTATTR_FSROOTSUBDIR exist off the filesystem root? |
| 676 | * If so, automatically start EA's. |
| 677 | */ |
| 678 | error = VFS_ROOT(mp, &rvp); |
| 679 | if (error) { |
| 680 | printf("ufs_extattr_autostart.VFS_ROOT() returned %d\n" , |
| 681 | error); |
| 682 | return (error); |
| 683 | } |
| 684 | |
| 685 | KASSERT(VOP_ISLOCKED(rvp) == LK_EXCLUSIVE); |
| 686 | |
| 687 | error = ufs_extattr_lookup(rvp, 0, |
| 688 | UFS_EXTATTR_FSROOTSUBDIR, &attr_dvp, l); |
| 689 | if (error) { |
| 690 | /* rvp ref'd but now unlocked */ |
| 691 | KASSERT(VOP_ISLOCKED(rvp) == 0); |
| 692 | vrele(rvp); |
| 693 | return (error); |
| 694 | } |
| 695 | if (rvp == attr_dvp) { |
| 696 | /* Should never happen. */ |
| 697 | KASSERT(VOP_ISLOCKED(rvp) == LK_EXCLUSIVE); |
| 698 | vrele(attr_dvp); |
| 699 | vput(rvp); |
| 700 | return (EINVAL); |
| 701 | } |
| 702 | KASSERT(VOP_ISLOCKED(rvp) == 0); |
| 703 | vrele(rvp); |
| 704 | |
| 705 | KASSERT(VOP_ISLOCKED(attr_dvp) == LK_EXCLUSIVE); |
| 706 | |
| 707 | if (attr_dvp->v_type != VDIR) { |
| 708 | printf("ufs_extattr_autostart: %s != VDIR\n" , |
| 709 | UFS_EXTATTR_FSROOTSUBDIR); |
| 710 | goto return_vput_attr_dvp; |
| 711 | } |
| 712 | |
| 713 | error = ufs_extattr_start(mp, l); |
| 714 | if (error) { |
| 715 | printf("ufs_extattr_autostart: ufs_extattr_start failed (%d)\n" , |
| 716 | error); |
| 717 | goto return_vput_attr_dvp; |
| 718 | } |
| 719 | |
| 720 | /* |
| 721 | * Look for two subdirectories: UFS_EXTATTR_SUBDIR_SYSTEM, |
| 722 | * UFS_EXTATTR_SUBDIR_USER. For each, iterate over the sub-directory, |
| 723 | * and start with appropriate type. Failures in either don't |
| 724 | * result in an over-all failure. attr_dvp is left locked to |
| 725 | * be cleaned up on exit. |
| 726 | */ |
| 727 | error = ufs_extattr_lookup(attr_dvp, LOCKPARENT, |
| 728 | UFS_EXTATTR_SUBDIR_SYSTEM, &attr_system_dvp, l); |
| 729 | KASSERT(VOP_ISLOCKED(attr_dvp) == LK_EXCLUSIVE); |
| 730 | if (error == 0) { |
| 731 | KASSERT(VOP_ISLOCKED(attr_system_dvp) == LK_EXCLUSIVE); |
| 732 | error = ufs_extattr_iterate_directory(VFSTOUFS(mp), |
| 733 | attr_system_dvp, EXTATTR_NAMESPACE_SYSTEM, l); |
| 734 | if (error) |
| 735 | printf("ufs_extattr_iterate_directory returned %d\n" , |
| 736 | error); |
| 737 | KASSERT(VOP_ISLOCKED(attr_system_dvp) == LK_EXCLUSIVE); |
| 738 | vput(attr_system_dvp); |
| 739 | } |
| 740 | |
| 741 | error = ufs_extattr_lookup(attr_dvp, LOCKPARENT, |
| 742 | UFS_EXTATTR_SUBDIR_USER, &attr_user_dvp, l); |
| 743 | KASSERT(VOP_ISLOCKED(attr_dvp) == LK_EXCLUSIVE); |
| 744 | if (error == 0) { |
| 745 | KASSERT(VOP_ISLOCKED(attr_user_dvp) == LK_EXCLUSIVE); |
| 746 | error = ufs_extattr_iterate_directory(VFSTOUFS(mp), |
| 747 | attr_user_dvp, EXTATTR_NAMESPACE_USER, l); |
| 748 | if (error) |
| 749 | printf("ufs_extattr_iterate_directory returned %d\n" , |
| 750 | error); |
| 751 | KASSERT(VOP_ISLOCKED(attr_user_dvp) == LK_EXCLUSIVE); |
| 752 | vput(attr_user_dvp); |
| 753 | } |
| 754 | |
| 755 | /* Mask startup failures in sub-directories. */ |
| 756 | error = 0; |
| 757 | |
| 758 | return_vput_attr_dvp: |
| 759 | KASSERT(VOP_ISLOCKED(attr_dvp) == LK_EXCLUSIVE); |
| 760 | vput(attr_dvp); |
| 761 | |
| 762 | return (error); |
| 763 | } |
| 764 | |
| 765 | /* |
| 766 | * Stop extended attribute support on an FS. |
| 767 | */ |
| 768 | void |
| 769 | ufs_extattr_stop(struct mount *mp, struct lwp *l) |
| 770 | { |
| 771 | struct ufs_extattr_list_entry *uele; |
| 772 | struct ufsmount *ump = VFSTOUFS(mp); |
| 773 | |
| 774 | ufs_extattr_uepm_lock(ump); |
| 775 | |
| 776 | /* |
| 777 | * If we haven't been started, no big deal. Just short-circuit |
| 778 | * the processing work. |
| 779 | */ |
| 780 | if (!(ump->um_extattr.uepm_flags & UFS_EXTATTR_UEPM_STARTED)) { |
| 781 | goto unlock; |
| 782 | } |
| 783 | |
| 784 | while (LIST_FIRST(&ump->um_extattr.uepm_list) != NULL) { |
| 785 | uele = LIST_FIRST(&ump->um_extattr.uepm_list); |
| 786 | ufs_extattr_disable(ump, uele->uele_attrnamespace, |
| 787 | uele->uele_attrname, l); |
| 788 | } |
| 789 | |
| 790 | ump->um_extattr.uepm_flags &= ~UFS_EXTATTR_UEPM_STARTED; |
| 791 | |
| 792 | kauth_cred_free(ump->um_extattr.uepm_ucred); |
| 793 | ump->um_extattr.uepm_ucred = NULL; |
| 794 | |
| 795 | unlock: |
| 796 | ufs_extattr_uepm_unlock(ump); |
| 797 | } |
| 798 | |
| 799 | /* |
| 800 | * Enable a named attribute on the specified filesystem; provide an |
| 801 | * unlocked backing vnode to hold the attribute data. |
| 802 | */ |
| 803 | static int |
| 804 | ufs_extattr_enable(struct ufsmount *ump, int attrnamespace, |
| 805 | const char *attrname, struct vnode *backing_vnode, struct lwp *l) |
| 806 | { |
| 807 | struct ufs_extattr_list_entry *attribute; |
| 808 | struct iovec aiov; |
| 809 | struct uio auio; |
| 810 | int error = 0; |
| 811 | |
| 812 | if (!ufs_extattr_valid_attrname(attrnamespace, attrname)) |
| 813 | return (EINVAL); |
| 814 | if (backing_vnode->v_type != VREG) |
| 815 | return (EINVAL); |
| 816 | |
| 817 | attribute = kmem_zalloc(sizeof(*attribute), KM_SLEEP); |
| 818 | |
| 819 | if (!(ump->um_extattr.uepm_flags & UFS_EXTATTR_UEPM_STARTED)) { |
| 820 | error = EOPNOTSUPP; |
| 821 | goto free_exit; |
| 822 | } |
| 823 | |
| 824 | if (ufs_extattr_find_attr(ump, attrnamespace, attrname)) { |
| 825 | error = EEXIST; |
| 826 | goto free_exit; |
| 827 | } |
| 828 | |
| 829 | strncpy(attribute->uele_attrname, attrname, |
| 830 | UFS_EXTATTR_MAXEXTATTRNAME); |
| 831 | attribute->uele_attrnamespace = attrnamespace; |
| 832 | memset(&attribute->uele_fileheader, 0, |
| 833 | sizeof(struct ufs_extattr_fileheader)); |
| 834 | |
| 835 | attribute->uele_backing_vnode = backing_vnode; |
| 836 | |
| 837 | auio.uio_iov = &aiov; |
| 838 | auio.uio_iovcnt = 1; |
| 839 | aiov.iov_base = (void *) &attribute->uele_fileheader; |
| 840 | aiov.iov_len = sizeof(struct ufs_extattr_fileheader); |
| 841 | auio.uio_resid = sizeof(struct ufs_extattr_fileheader); |
| 842 | auio.uio_offset = (off_t) 0; |
| 843 | auio.uio_rw = UIO_READ; |
| 844 | UIO_SETUP_SYSSPACE(&auio); |
| 845 | |
| 846 | vn_lock(backing_vnode, LK_SHARED | LK_RETRY); |
| 847 | error = VOP_READ(backing_vnode, &auio, IO_NODELOCKED, |
| 848 | ump->um_extattr.uepm_ucred); |
| 849 | |
| 850 | if (error) |
| 851 | goto unlock_free_exit; |
| 852 | |
| 853 | if (auio.uio_resid != 0) { |
| 854 | printf("ufs_extattr_enable: malformed attribute header\n" ); |
| 855 | error = EINVAL; |
| 856 | goto unlock_free_exit; |
| 857 | } |
| 858 | |
| 859 | /* |
| 860 | * Try to determine the byte order of the attribute file. |
| 861 | */ |
| 862 | if (attribute->uele_fileheader.uef_magic != UFS_EXTATTR_MAGIC) { |
| 863 | attribute->uele_flags |= UELE_F_NEEDSWAP; |
| 864 | attribute->uele_fileheader.uef_magic = |
| 865 | ufs_rw32(attribute->uele_fileheader.uef_magic, |
| 866 | UELE_NEEDSWAP(attribute)); |
| 867 | if (attribute->uele_fileheader.uef_magic != UFS_EXTATTR_MAGIC) { |
| 868 | printf("ufs_extattr_enable: invalid attribute header " |
| 869 | "magic\n" ); |
| 870 | error = EINVAL; |
| 871 | goto unlock_free_exit; |
| 872 | } |
| 873 | } |
| 874 | attribute->uele_fileheader.uef_version = |
| 875 | ufs_rw32(attribute->uele_fileheader.uef_version, |
| 876 | UELE_NEEDSWAP(attribute)); |
| 877 | attribute->uele_fileheader.uef_size = |
| 878 | ufs_rw32(attribute->uele_fileheader.uef_size, |
| 879 | UELE_NEEDSWAP(attribute)); |
| 880 | |
| 881 | if (attribute->uele_fileheader.uef_version != UFS_EXTATTR_VERSION) { |
| 882 | printf("ufs_extattr_enable: incorrect attribute header " |
| 883 | "version\n" ); |
| 884 | error = EINVAL; |
| 885 | goto unlock_free_exit; |
| 886 | } |
| 887 | |
| 888 | LIST_INSERT_HEAD(&ump->um_extattr.uepm_list, attribute, |
| 889 | uele_entries); |
| 890 | |
| 891 | VOP_UNLOCK(backing_vnode); |
| 892 | return (0); |
| 893 | |
| 894 | unlock_free_exit: |
| 895 | VOP_UNLOCK(backing_vnode); |
| 896 | |
| 897 | free_exit: |
| 898 | kmem_free(attribute, sizeof(*attribute)); |
| 899 | return (error); |
| 900 | } |
| 901 | |
| 902 | /* |
| 903 | * Disable extended attribute support on an FS. |
| 904 | */ |
| 905 | static int |
| 906 | ufs_extattr_disable(struct ufsmount *ump, int attrnamespace, |
| 907 | const char *attrname, struct lwp *l) |
| 908 | { |
| 909 | struct ufs_extattr_list_entry *uele; |
| 910 | int error = 0; |
| 911 | |
| 912 | if (!ufs_extattr_valid_attrname(attrnamespace, attrname)) |
| 913 | return (EINVAL); |
| 914 | |
| 915 | uele = ufs_extattr_find_attr(ump, attrnamespace, attrname); |
| 916 | if (!uele) |
| 917 | return (ENODATA); |
| 918 | |
| 919 | LIST_REMOVE(uele, uele_entries); |
| 920 | |
| 921 | error = vn_close(uele->uele_backing_vnode, FREAD|FWRITE, |
| 922 | l->l_cred); |
| 923 | |
| 924 | kmem_free(uele, sizeof(*uele)); |
| 925 | |
| 926 | return (error); |
| 927 | } |
| 928 | |
| 929 | /* |
| 930 | * VFS call to manage extended attributes in UFS. If filename_vp is |
| 931 | * non-NULL, it must be passed in locked, and regardless of errors in |
| 932 | * processing, will be unlocked. |
| 933 | */ |
| 934 | int |
| 935 | ufs_extattrctl(struct mount *mp, int cmd, struct vnode *filename_vp, |
| 936 | int attrnamespace, const char *attrname) |
| 937 | { |
| 938 | struct lwp *l = curlwp; |
| 939 | struct ufsmount *ump = VFSTOUFS(mp); |
| 940 | int error; |
| 941 | |
| 942 | /* |
| 943 | * Only privileged processes can configure extended attributes. |
| 944 | */ |
| 945 | error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FS_EXTATTR, |
| 946 | 0, mp, NULL, NULL); |
| 947 | if (error) { |
| 948 | if (filename_vp != NULL) |
| 949 | VOP_UNLOCK(filename_vp); |
| 950 | return (error); |
| 951 | } |
| 952 | |
| 953 | switch(cmd) { |
| 954 | case UFS_EXTATTR_CMD_START: |
| 955 | if (filename_vp != NULL) { |
| 956 | VOP_UNLOCK(filename_vp); |
| 957 | return (EINVAL); |
| 958 | } |
| 959 | if (attrname != NULL) |
| 960 | return (EINVAL); |
| 961 | |
| 962 | error = ufs_extattr_autostart(mp, l); |
| 963 | return (error); |
| 964 | |
| 965 | case UFS_EXTATTR_CMD_STOP: |
| 966 | if (filename_vp != NULL) { |
| 967 | VOP_UNLOCK(filename_vp); |
| 968 | return (EINVAL); |
| 969 | } |
| 970 | if (attrname != NULL) |
| 971 | return (EINVAL); |
| 972 | |
| 973 | ufs_extattr_stop(mp, l); |
| 974 | return (0); |
| 975 | |
| 976 | case UFS_EXTATTR_CMD_ENABLE: |
| 977 | if (filename_vp == NULL) |
| 978 | return (EINVAL); |
| 979 | if (attrname == NULL) { |
| 980 | VOP_UNLOCK(filename_vp); |
| 981 | return (EINVAL); |
| 982 | } |
| 983 | |
| 984 | /* |
| 985 | * ufs_extattr_enable_with_open() will always unlock the |
| 986 | * vnode, regardless of failure. |
| 987 | */ |
| 988 | ufs_extattr_uepm_lock(ump); |
| 989 | error = ufs_extattr_enable_with_open(ump, filename_vp, |
| 990 | attrnamespace, attrname, l); |
| 991 | ufs_extattr_uepm_unlock(ump); |
| 992 | return (error); |
| 993 | |
| 994 | case UFS_EXTATTR_CMD_DISABLE: |
| 995 | if (filename_vp != NULL) { |
| 996 | VOP_UNLOCK(filename_vp); |
| 997 | return (EINVAL); |
| 998 | } |
| 999 | if (attrname == NULL) |
| 1000 | return (EINVAL); |
| 1001 | |
| 1002 | ufs_extattr_uepm_lock(ump); |
| 1003 | error = ufs_extattr_disable(ump, attrnamespace, attrname, l); |
| 1004 | ufs_extattr_uepm_unlock(ump); |
| 1005 | return (error); |
| 1006 | |
| 1007 | default: |
| 1008 | return (EINVAL); |
| 1009 | } |
| 1010 | } |
| 1011 | |
| 1012 | /* |
| 1013 | * Read extended attribute header for a given vnode and attribute. |
| 1014 | * Backing vnode should be locked and unlocked by caller. |
| 1015 | */ |
| 1016 | static int |
| 1017 | (struct vnode *vp, struct ufs_extattr_list_entry *uele, |
| 1018 | struct ufs_extattr_header *ueh, off_t *bap) |
| 1019 | { |
| 1020 | struct mount *mp = vp->v_mount; |
| 1021 | struct ufsmount *ump = VFSTOUFS(mp); |
| 1022 | struct inode *ip = VTOI(vp); |
| 1023 | off_t base_offset; |
| 1024 | struct iovec aiov; |
| 1025 | struct uio aio; |
| 1026 | int error; |
| 1027 | |
| 1028 | /* |
| 1029 | * Find base offset of header in file based on file header size, and |
| 1030 | * data header size + maximum data size, indexed by inode number. |
| 1031 | */ |
| 1032 | base_offset = sizeof(struct ufs_extattr_fileheader) + |
| 1033 | ip->i_number * (sizeof(struct ufs_extattr_header) + |
| 1034 | uele->uele_fileheader.uef_size); |
| 1035 | |
| 1036 | /* |
| 1037 | * Read in the data header to see if the data is defined, and if so |
| 1038 | * how much. |
| 1039 | */ |
| 1040 | memset(ueh, 0, sizeof(struct ufs_extattr_header)); |
| 1041 | aiov.iov_base = ueh; |
| 1042 | aiov.iov_len = sizeof(struct ufs_extattr_header); |
| 1043 | aio.uio_iov = &aiov; |
| 1044 | aio.uio_iovcnt = 1; |
| 1045 | aio.uio_rw = UIO_READ; |
| 1046 | aio.uio_offset = base_offset; |
| 1047 | aio.uio_resid = sizeof(struct ufs_extattr_header); |
| 1048 | UIO_SETUP_SYSSPACE(&aio); |
| 1049 | |
| 1050 | error = VOP_READ(uele->uele_backing_vnode, &aio, |
| 1051 | IO_NODELOCKED, ump->um_extattr.uepm_ucred); |
| 1052 | if (error) |
| 1053 | return error; |
| 1054 | |
| 1055 | /* |
| 1056 | * Attribute headers are kept in file system byte order. |
| 1057 | * XXX What about the blob of data? |
| 1058 | */ |
| 1059 | ueh->ueh_flags = ufs_rw32(ueh->ueh_flags, UELE_NEEDSWAP(uele)); |
| 1060 | ueh->ueh_len = ufs_rw32(ueh->ueh_len, UELE_NEEDSWAP(uele)); |
| 1061 | ueh->ueh_i_gen = ufs_rw32(ueh->ueh_i_gen, UELE_NEEDSWAP(uele)); |
| 1062 | |
| 1063 | /* Defined? */ |
| 1064 | if ((ueh->ueh_flags & UFS_EXTATTR_ATTR_FLAG_INUSE) == 0) |
| 1065 | return ENODATA; |
| 1066 | |
| 1067 | /* Valid for the current inode generation? */ |
| 1068 | if (ueh->ueh_i_gen != ip->i_gen) { |
| 1069 | /* |
| 1070 | * The inode itself has a different generation number |
| 1071 | * than the uele data. For now, the best solution |
| 1072 | * is to coerce this to undefined, and let it get cleaned |
| 1073 | * up by the next write or extattrctl clean. |
| 1074 | */ |
| 1075 | printf("%s (%s): inode gen inconsistency (%u, %jd)\n" , |
| 1076 | __func__, mp->mnt_stat.f_mntonname, ueh->ueh_i_gen, |
| 1077 | (intmax_t)ip->i_gen); |
| 1078 | return ENODATA; |
| 1079 | } |
| 1080 | |
| 1081 | /* Local size consistency check. */ |
| 1082 | if (ueh->ueh_len > uele->uele_fileheader.uef_size) |
| 1083 | return ENXIO; |
| 1084 | |
| 1085 | /* Return base offset */ |
| 1086 | if (bap != NULL) |
| 1087 | *bap = base_offset; |
| 1088 | |
| 1089 | return 0; |
| 1090 | } |
| 1091 | |
| 1092 | /* |
| 1093 | * Vnode operation to retrieve a named extended attribute. |
| 1094 | */ |
| 1095 | int |
| 1096 | ufs_getextattr(struct vop_getextattr_args *ap) |
| 1097 | /* |
| 1098 | vop_getextattr { |
| 1099 | IN struct vnode *a_vp; |
| 1100 | IN int a_attrnamespace; |
| 1101 | IN const char *a_name; |
| 1102 | INOUT struct uio *a_uio; |
| 1103 | OUT size_t *a_size; |
| 1104 | IN kauth_cred_t a_cred; |
| 1105 | }; |
| 1106 | */ |
| 1107 | { |
| 1108 | struct mount *mp = ap->a_vp->v_mount; |
| 1109 | struct ufsmount *ump = VFSTOUFS(mp); |
| 1110 | int error; |
| 1111 | |
| 1112 | if (!(ump->um_extattr.uepm_flags & UFS_EXTATTR_UEPM_STARTED)) |
| 1113 | return (EOPNOTSUPP); |
| 1114 | |
| 1115 | ufs_extattr_uepm_lock(ump); |
| 1116 | |
| 1117 | error = ufs_extattr_get(ap->a_vp, ap->a_attrnamespace, ap->a_name, |
| 1118 | ap->a_uio, ap->a_size, ap->a_cred, curlwp); |
| 1119 | |
| 1120 | ufs_extattr_uepm_unlock(ump); |
| 1121 | |
| 1122 | return (error); |
| 1123 | } |
| 1124 | |
| 1125 | /* |
| 1126 | * Real work associated with retrieving a named attribute--assumes that |
| 1127 | * the attribute lock has already been grabbed. |
| 1128 | */ |
| 1129 | static int |
| 1130 | ufs_extattr_get(struct vnode *vp, int attrnamespace, const char *name, |
| 1131 | struct uio *uio, size_t *size, kauth_cred_t cred, struct lwp *l) |
| 1132 | { |
| 1133 | struct ufs_extattr_list_entry *attribute; |
| 1134 | struct ufs_extattr_header ueh; |
| 1135 | struct mount *mp = vp->v_mount; |
| 1136 | struct ufsmount *ump = VFSTOUFS(mp); |
| 1137 | off_t base_offset; |
| 1138 | size_t len, old_len; |
| 1139 | int error = 0; |
| 1140 | |
| 1141 | if (strlen(name) == 0) |
| 1142 | return (EINVAL); |
| 1143 | |
| 1144 | error = internal_extattr_check_cred(vp, attrnamespace, name, cred, |
| 1145 | VREAD); |
| 1146 | if (error) |
| 1147 | return (error); |
| 1148 | |
| 1149 | attribute = ufs_extattr_find_attr(ump, attrnamespace, name); |
| 1150 | if (!attribute) |
| 1151 | return (ENODATA); |
| 1152 | |
| 1153 | /* |
| 1154 | * Allow only offsets of zero to encourage the read/replace |
| 1155 | * extended attribute semantic. Otherwise we can't guarantee |
| 1156 | * atomicity, as we don't provide locks for extended attributes. |
| 1157 | */ |
| 1158 | if (uio != NULL && uio->uio_offset != 0) |
| 1159 | return (ENXIO); |
| 1160 | |
| 1161 | /* |
| 1162 | * Don't need to get a lock on the backing file if the getattr is |
| 1163 | * being applied to the backing file, as the lock is already held. |
| 1164 | */ |
| 1165 | if (attribute->uele_backing_vnode != vp) |
| 1166 | vn_lock(attribute->uele_backing_vnode, LK_SHARED | LK_RETRY); |
| 1167 | |
| 1168 | error = ufs_extattr_get_header(vp, attribute, &ueh, &base_offset); |
| 1169 | if (error) |
| 1170 | goto vopunlock_exit; |
| 1171 | |
| 1172 | /* Return full data size if caller requested it. */ |
| 1173 | if (size != NULL) |
| 1174 | *size = ueh.ueh_len; |
| 1175 | |
| 1176 | /* Return data if the caller requested it. */ |
| 1177 | if (uio != NULL) { |
| 1178 | /* Allow for offset into the attribute data. */ |
| 1179 | uio->uio_offset = base_offset + sizeof(struct |
| 1180 | ufs_extattr_header); |
| 1181 | |
| 1182 | /* |
| 1183 | * Figure out maximum to transfer -- use buffer size and |
| 1184 | * local data limit. |
| 1185 | */ |
| 1186 | len = MIN(uio->uio_resid, ueh.ueh_len); |
| 1187 | old_len = uio->uio_resid; |
| 1188 | uio->uio_resid = len; |
| 1189 | |
| 1190 | error = VOP_READ(attribute->uele_backing_vnode, uio, |
| 1191 | IO_NODELOCKED, ump->um_extattr.uepm_ucred); |
| 1192 | if (error) |
| 1193 | goto vopunlock_exit; |
| 1194 | |
| 1195 | uio->uio_resid = old_len - (len - uio->uio_resid); |
| 1196 | } |
| 1197 | |
| 1198 | vopunlock_exit: |
| 1199 | |
| 1200 | if (uio != NULL) |
| 1201 | uio->uio_offset = 0; |
| 1202 | |
| 1203 | if (attribute->uele_backing_vnode != vp) |
| 1204 | VOP_UNLOCK(attribute->uele_backing_vnode); |
| 1205 | |
| 1206 | return (error); |
| 1207 | } |
| 1208 | |
| 1209 | /* |
| 1210 | * Vnode operation to list extended attribute for a vnode |
| 1211 | */ |
| 1212 | int |
| 1213 | ufs_listextattr(struct vop_listextattr_args *ap) |
| 1214 | /* |
| 1215 | vop_listextattr { |
| 1216 | IN struct vnode *a_vp; |
| 1217 | IN int a_attrnamespace; |
| 1218 | INOUT struct uio *a_uio; |
| 1219 | OUT size_t *a_size; |
| 1220 | IN int flag; |
| 1221 | IN kauth_cred_t a_cred; |
| 1222 | struct proc *a_p; |
| 1223 | }; |
| 1224 | */ |
| 1225 | { |
| 1226 | struct mount *mp = ap->a_vp->v_mount; |
| 1227 | struct ufsmount *ump = VFSTOUFS(mp); |
| 1228 | int error; |
| 1229 | |
| 1230 | if (!(ump->um_extattr.uepm_flags & UFS_EXTATTR_UEPM_STARTED)) |
| 1231 | return (EOPNOTSUPP); |
| 1232 | |
| 1233 | ufs_extattr_uepm_lock(ump); |
| 1234 | |
| 1235 | error = ufs_extattr_list(ap->a_vp, ap->a_attrnamespace, |
| 1236 | ap->a_uio, ap->a_size, ap->a_flag, ap->a_cred, curlwp); |
| 1237 | |
| 1238 | ufs_extattr_uepm_unlock(ump); |
| 1239 | |
| 1240 | return (error); |
| 1241 | } |
| 1242 | |
| 1243 | /* |
| 1244 | * Real work associated with retrieving list of attributes--assumes that |
| 1245 | * the attribute lock has already been grabbed. |
| 1246 | */ |
| 1247 | static int |
| 1248 | ufs_extattr_list(struct vnode *vp, int attrnamespace, |
| 1249 | struct uio *uio, size_t *size, int flag, |
| 1250 | kauth_cred_t cred, struct lwp *l) |
| 1251 | { |
| 1252 | struct ufs_extattr_list_entry *uele; |
| 1253 | struct ufs_extattr_header ueh; |
| 1254 | struct mount *mp = vp->v_mount; |
| 1255 | struct ufsmount *ump = VFSTOUFS(mp); |
| 1256 | size_t listsize = 0; |
| 1257 | int error = 0; |
| 1258 | |
| 1259 | /* |
| 1260 | * XXX: We can move this inside the loop and iterate on individual |
| 1261 | * attributes. |
| 1262 | */ |
| 1263 | error = internal_extattr_check_cred(vp, attrnamespace, "" , cred, |
| 1264 | VREAD); |
| 1265 | if (error) |
| 1266 | return (error); |
| 1267 | |
| 1268 | LIST_FOREACH(uele, &ump->um_extattr.uepm_list, uele_entries) { |
| 1269 | unsigned char attrnamelen; |
| 1270 | |
| 1271 | if (uele->uele_attrnamespace != attrnamespace) |
| 1272 | continue; |
| 1273 | |
| 1274 | error = ufs_extattr_get_header(vp, uele, &ueh, NULL); |
| 1275 | if (error == ENODATA) |
| 1276 | continue; |
| 1277 | if (error != 0) |
| 1278 | return error; |
| 1279 | |
| 1280 | /* |
| 1281 | * Don't need to get a lock on the backing file if |
| 1282 | * the listattr is being applied to the backing file, |
| 1283 | * as the lock is already held. |
| 1284 | */ |
| 1285 | if (uele->uele_backing_vnode != vp) |
| 1286 | vn_lock(uele->uele_backing_vnode, LK_SHARED | LK_RETRY); |
| 1287 | |
| 1288 | /* |
| 1289 | * +1 for trailing NUL (listxattr flavor) |
| 1290 | * or leading name length (extattr_list_file flavor) |
| 1291 | */ |
| 1292 | attrnamelen = strlen(uele->uele_attrname); |
| 1293 | listsize += attrnamelen + 1; |
| 1294 | |
| 1295 | /* Return data if the caller requested it. */ |
| 1296 | if (uio != NULL) { |
| 1297 | /* |
| 1298 | * We support two flavors. Either NUL-terminated |
| 1299 | * strings (a la listxattr), or non NUL-terminated, |
| 1300 | * one byte length prefixed strings (for |
| 1301 | * extattr_list_file). EXTATTR_LIST_LENPREFIX switches |
| 1302 | * that second behavior. |
| 1303 | */ |
| 1304 | if (flag & EXTATTR_LIST_LENPREFIX) { |
| 1305 | uint8_t len = (uint8_t)attrnamelen; |
| 1306 | |
| 1307 | /* Copy leading name length */ |
| 1308 | error = uiomove(&len, sizeof(len), uio); |
| 1309 | if (error != 0) |
| 1310 | break; |
| 1311 | } else { |
| 1312 | /* Include trailing NULL */ |
| 1313 | attrnamelen++; |
| 1314 | } |
| 1315 | |
| 1316 | error = uiomove(uele->uele_attrname, |
| 1317 | (size_t)attrnamelen, uio); |
| 1318 | if (error != 0) |
| 1319 | break; |
| 1320 | } |
| 1321 | |
| 1322 | if (uele->uele_backing_vnode != vp) |
| 1323 | VOP_UNLOCK(uele->uele_backing_vnode); |
| 1324 | |
| 1325 | if (error != 0) |
| 1326 | return error; |
| 1327 | } |
| 1328 | |
| 1329 | if (uio != NULL) |
| 1330 | uio->uio_offset = 0; |
| 1331 | |
| 1332 | /* Return full data size if caller requested it. */ |
| 1333 | if (size != NULL) |
| 1334 | *size = listsize; |
| 1335 | |
| 1336 | return 0; |
| 1337 | } |
| 1338 | |
| 1339 | /* |
| 1340 | * Vnode operation to remove a named attribute. |
| 1341 | */ |
| 1342 | int |
| 1343 | ufs_deleteextattr(struct vop_deleteextattr_args *ap) |
| 1344 | /* |
| 1345 | vop_deleteextattr { |
| 1346 | IN struct vnode *a_vp; |
| 1347 | IN int a_attrnamespace; |
| 1348 | IN const char *a_name; |
| 1349 | IN kauth_cred_t a_cred; |
| 1350 | }; |
| 1351 | */ |
| 1352 | { |
| 1353 | struct mount *mp = ap->a_vp->v_mount; |
| 1354 | struct ufsmount *ump = VFSTOUFS(mp); |
| 1355 | int error; |
| 1356 | |
| 1357 | if (!(ump->um_extattr.uepm_flags & UFS_EXTATTR_UEPM_STARTED)) |
| 1358 | return (EOPNOTSUPP); |
| 1359 | |
| 1360 | ufs_extattr_uepm_lock(ump); |
| 1361 | |
| 1362 | error = ufs_extattr_rm(ap->a_vp, ap->a_attrnamespace, ap->a_name, |
| 1363 | ap->a_cred, curlwp); |
| 1364 | |
| 1365 | ufs_extattr_uepm_unlock(ump); |
| 1366 | |
| 1367 | return (error); |
| 1368 | } |
| 1369 | |
| 1370 | /* |
| 1371 | * Vnode operation to set a named attribute. |
| 1372 | */ |
| 1373 | int |
| 1374 | ufs_setextattr(struct vop_setextattr_args *ap) |
| 1375 | /* |
| 1376 | vop_setextattr { |
| 1377 | IN struct vnode *a_vp; |
| 1378 | IN int a_attrnamespace; |
| 1379 | IN const char *a_name; |
| 1380 | INOUT struct uio *a_uio; |
| 1381 | IN kauth_cred_t a_cred; |
| 1382 | }; |
| 1383 | */ |
| 1384 | { |
| 1385 | struct mount *mp = ap->a_vp->v_mount; |
| 1386 | struct ufsmount *ump = VFSTOUFS(mp); |
| 1387 | int error; |
| 1388 | |
| 1389 | if (!(ump->um_extattr.uepm_flags & UFS_EXTATTR_UEPM_STARTED)) |
| 1390 | return (EOPNOTSUPP); |
| 1391 | |
| 1392 | ufs_extattr_uepm_lock(ump); |
| 1393 | |
| 1394 | /* |
| 1395 | * XXX: No longer a supported way to delete extended attributes. |
| 1396 | */ |
| 1397 | if (ap->a_uio == NULL) { |
| 1398 | ufs_extattr_uepm_unlock(ump); |
| 1399 | return (EINVAL); |
| 1400 | } |
| 1401 | |
| 1402 | error = ufs_extattr_set(ap->a_vp, ap->a_attrnamespace, ap->a_name, |
| 1403 | ap->a_uio, ap->a_cred, curlwp); |
| 1404 | |
| 1405 | ufs_extattr_uepm_unlock(ump); |
| 1406 | |
| 1407 | return (error); |
| 1408 | } |
| 1409 | |
| 1410 | /* |
| 1411 | * Real work associated with setting a vnode's extended attributes; |
| 1412 | * assumes that the attribute lock has already been grabbed. |
| 1413 | */ |
| 1414 | static int |
| 1415 | ufs_extattr_set(struct vnode *vp, int attrnamespace, const char *name, |
| 1416 | struct uio *uio, kauth_cred_t cred, struct lwp *l) |
| 1417 | { |
| 1418 | struct ufs_extattr_list_entry *attribute; |
| 1419 | struct ufs_extattr_header ueh; |
| 1420 | struct iovec local_aiov; |
| 1421 | struct uio local_aio; |
| 1422 | struct mount *mp = vp->v_mount; |
| 1423 | struct ufsmount *ump = VFSTOUFS(mp); |
| 1424 | struct inode *ip = VTOI(vp); |
| 1425 | off_t base_offset; |
| 1426 | int error = 0, ioflag; |
| 1427 | |
| 1428 | if (vp->v_mount->mnt_flag & MNT_RDONLY) |
| 1429 | return (EROFS); |
| 1430 | |
| 1431 | if (!ufs_extattr_valid_attrname(attrnamespace, name)) |
| 1432 | return (EINVAL); |
| 1433 | |
| 1434 | error = internal_extattr_check_cred(vp, attrnamespace, name, cred, |
| 1435 | VWRITE); |
| 1436 | if (error) |
| 1437 | return (error); |
| 1438 | |
| 1439 | attribute = ufs_extattr_find_attr(ump, attrnamespace, name); |
| 1440 | if (!attribute) { |
| 1441 | error = ufs_extattr_autocreate_attr(vp, attrnamespace, |
| 1442 | name, l, &attribute); |
| 1443 | if (error == EEXIST) { |
| 1444 | /* Another thread raced us for backend creation */ |
| 1445 | error = 0; |
| 1446 | attribute = |
| 1447 | ufs_extattr_find_attr(ump, attrnamespace, name); |
| 1448 | } |
| 1449 | |
| 1450 | if (error || !attribute) |
| 1451 | return ENODATA; |
| 1452 | } |
| 1453 | |
| 1454 | /* |
| 1455 | * Early rejection of invalid offsets/length. |
| 1456 | * Reject: any offset but 0 (replace) |
| 1457 | * Any size greater than attribute size limit |
| 1458 | */ |
| 1459 | if (uio->uio_offset != 0 || |
| 1460 | uio->uio_resid > attribute->uele_fileheader.uef_size) |
| 1461 | return (ENXIO); |
| 1462 | |
| 1463 | /* |
| 1464 | * Find base offset of header in file based on file header size, and |
| 1465 | * data header size + maximum data size, indexed by inode number. |
| 1466 | */ |
| 1467 | base_offset = sizeof(struct ufs_extattr_fileheader) + |
| 1468 | ip->i_number * (sizeof(struct ufs_extattr_header) + |
| 1469 | attribute->uele_fileheader.uef_size); |
| 1470 | |
| 1471 | /* |
| 1472 | * Write out a data header for the data. |
| 1473 | */ |
| 1474 | ueh.ueh_len = ufs_rw32((uint32_t) uio->uio_resid, |
| 1475 | UELE_NEEDSWAP(attribute)); |
| 1476 | ueh.ueh_flags = ufs_rw32(UFS_EXTATTR_ATTR_FLAG_INUSE, |
| 1477 | UELE_NEEDSWAP(attribute)); |
| 1478 | ueh.ueh_i_gen = ufs_rw32(ip->i_gen, UELE_NEEDSWAP(attribute)); |
| 1479 | local_aiov.iov_base = &ueh; |
| 1480 | local_aiov.iov_len = sizeof(struct ufs_extattr_header); |
| 1481 | local_aio.uio_iov = &local_aiov; |
| 1482 | local_aio.uio_iovcnt = 1; |
| 1483 | local_aio.uio_rw = UIO_WRITE; |
| 1484 | local_aio.uio_offset = base_offset; |
| 1485 | local_aio.uio_resid = sizeof(struct ufs_extattr_header); |
| 1486 | UIO_SETUP_SYSSPACE(&local_aio); |
| 1487 | |
| 1488 | /* |
| 1489 | * Don't need to get a lock on the backing file if the setattr is |
| 1490 | * being applied to the backing file, as the lock is already held. |
| 1491 | */ |
| 1492 | if (attribute->uele_backing_vnode != vp) |
| 1493 | vn_lock(attribute->uele_backing_vnode, |
| 1494 | LK_EXCLUSIVE | LK_RETRY); |
| 1495 | |
| 1496 | ioflag = IO_NODELOCKED; |
| 1497 | if (ufs_extattr_sync) |
| 1498 | ioflag |= IO_SYNC; |
| 1499 | error = VOP_WRITE(attribute->uele_backing_vnode, &local_aio, ioflag, |
| 1500 | ump->um_extattr.uepm_ucred); |
| 1501 | if (error) |
| 1502 | goto vopunlock_exit; |
| 1503 | |
| 1504 | if (local_aio.uio_resid != 0) { |
| 1505 | error = ENXIO; |
| 1506 | goto vopunlock_exit; |
| 1507 | } |
| 1508 | |
| 1509 | /* |
| 1510 | * Write out user data. |
| 1511 | * XXX NOT ATOMIC WITH RESPECT TO THE HEADER. |
| 1512 | */ |
| 1513 | uio->uio_offset = base_offset + sizeof(struct ufs_extattr_header); |
| 1514 | |
| 1515 | ioflag = IO_NODELOCKED; |
| 1516 | if (ufs_extattr_sync) |
| 1517 | ioflag |= IO_SYNC; |
| 1518 | error = VOP_WRITE(attribute->uele_backing_vnode, uio, ioflag, |
| 1519 | ump->um_extattr.uepm_ucred); |
| 1520 | |
| 1521 | vopunlock_exit: |
| 1522 | uio->uio_offset = 0; |
| 1523 | |
| 1524 | if (attribute->uele_backing_vnode != vp) |
| 1525 | VOP_UNLOCK(attribute->uele_backing_vnode); |
| 1526 | |
| 1527 | return (error); |
| 1528 | } |
| 1529 | |
| 1530 | /* |
| 1531 | * Real work associated with removing an extended attribute from a vnode. |
| 1532 | * Assumes the attribute lock has already been grabbed. |
| 1533 | */ |
| 1534 | static int |
| 1535 | ufs_extattr_rm(struct vnode *vp, int attrnamespace, const char *name, |
| 1536 | kauth_cred_t cred, struct lwp *l) |
| 1537 | { |
| 1538 | struct ufs_extattr_list_entry *attribute; |
| 1539 | struct ufs_extattr_header ueh; |
| 1540 | struct mount *mp = vp->v_mount; |
| 1541 | struct ufsmount *ump = VFSTOUFS(mp); |
| 1542 | struct iovec local_aiov; |
| 1543 | struct uio local_aio; |
| 1544 | off_t base_offset; |
| 1545 | int error = 0, ioflag; |
| 1546 | |
| 1547 | if (vp->v_mount->mnt_flag & MNT_RDONLY) |
| 1548 | return (EROFS); |
| 1549 | |
| 1550 | if (!ufs_extattr_valid_attrname(attrnamespace, name)) |
| 1551 | return (EINVAL); |
| 1552 | |
| 1553 | error = internal_extattr_check_cred(vp, attrnamespace, name, cred, |
| 1554 | VWRITE); |
| 1555 | if (error) |
| 1556 | return (error); |
| 1557 | |
| 1558 | attribute = ufs_extattr_find_attr(ump, attrnamespace, name); |
| 1559 | if (!attribute) |
| 1560 | return (ENODATA); |
| 1561 | |
| 1562 | /* |
| 1563 | * Don't need to get a lock on the backing file if the getattr is |
| 1564 | * being applied to the backing file, as the lock is already held. |
| 1565 | */ |
| 1566 | if (attribute->uele_backing_vnode != vp) |
| 1567 | vn_lock(attribute->uele_backing_vnode, LK_EXCLUSIVE | LK_RETRY); |
| 1568 | |
| 1569 | error = ufs_extattr_get_header(vp, attribute, &ueh, &base_offset); |
| 1570 | if (error) |
| 1571 | goto vopunlock_exit; |
| 1572 | |
| 1573 | /* Flag it as not in use. */ |
| 1574 | ueh.ueh_flags = 0; /* No need to byte swap 0 */ |
| 1575 | ueh.ueh_len = 0; /* ...ditto... */ |
| 1576 | |
| 1577 | local_aiov.iov_base = &ueh; |
| 1578 | local_aiov.iov_len = sizeof(struct ufs_extattr_header); |
| 1579 | local_aio.uio_iov = &local_aiov; |
| 1580 | local_aio.uio_iovcnt = 1; |
| 1581 | local_aio.uio_rw = UIO_WRITE; |
| 1582 | local_aio.uio_offset = base_offset; |
| 1583 | local_aio.uio_resid = sizeof(struct ufs_extattr_header); |
| 1584 | UIO_SETUP_SYSSPACE(&local_aio); |
| 1585 | |
| 1586 | ioflag = IO_NODELOCKED; |
| 1587 | if (ufs_extattr_sync) |
| 1588 | ioflag |= IO_SYNC; |
| 1589 | error = VOP_WRITE(attribute->uele_backing_vnode, &local_aio, ioflag, |
| 1590 | ump->um_extattr.uepm_ucred); |
| 1591 | if (error) |
| 1592 | goto vopunlock_exit; |
| 1593 | |
| 1594 | if (local_aio.uio_resid != 0) |
| 1595 | error = ENXIO; |
| 1596 | |
| 1597 | vopunlock_exit: |
| 1598 | VOP_UNLOCK(attribute->uele_backing_vnode); |
| 1599 | |
| 1600 | return (error); |
| 1601 | } |
| 1602 | |
| 1603 | /* |
| 1604 | * Called by UFS when an inode is no longer active and should have its |
| 1605 | * attributes stripped. |
| 1606 | */ |
| 1607 | void |
| 1608 | ufs_extattr_vnode_inactive(struct vnode *vp, struct lwp *l) |
| 1609 | { |
| 1610 | struct ufs_extattr_list_entry *uele; |
| 1611 | struct mount *mp = vp->v_mount; |
| 1612 | struct ufsmount *ump = VFSTOUFS(mp); |
| 1613 | |
| 1614 | /* |
| 1615 | * In that case, we cannot lock. We should not have any active vnodes |
| 1616 | * on the fs if this is not yet initialized but is going to be, so |
| 1617 | * this can go unlocked. |
| 1618 | */ |
| 1619 | if (!(ump->um_extattr.uepm_flags & UFS_EXTATTR_UEPM_INITIALIZED)) |
| 1620 | return; |
| 1621 | |
| 1622 | if (!(ump->um_extattr.uepm_flags & UFS_EXTATTR_UEPM_STARTED)) |
| 1623 | return; |
| 1624 | |
| 1625 | ufs_extattr_uepm_lock(ump); |
| 1626 | |
| 1627 | LIST_FOREACH(uele, &ump->um_extattr.uepm_list, uele_entries) |
| 1628 | ufs_extattr_rm(vp, uele->uele_attrnamespace, |
| 1629 | uele->uele_attrname, lwp0.l_cred, l); |
| 1630 | |
| 1631 | ufs_extattr_uepm_unlock(ump); |
| 1632 | } |
| 1633 | |
| 1634 | void |
| 1635 | ufs_extattr_init(void) |
| 1636 | { |
| 1637 | |
| 1638 | } |
| 1639 | |
| 1640 | void |
| 1641 | ufs_extattr_done(void) |
| 1642 | { |
| 1643 | |
| 1644 | } |
| 1645 | |