4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
25 /* Portions Copyright 2010 Robert Milkowski */
27 #include <sys/types.h>
28 #include <sys/param.h>
29 #include <sys/systm.h>
30 #include <sys/sysmacros.h>
32 #include <sys/pathname.h>
33 #include <sys/vnode.h>
35 #include <sys/vfs_opreg.h>
36 #include <sys/mntent.h>
37 #include <sys/mount.h>
38 #include <sys/cmn_err.h>
39 #include "fs/fs_subr.h"
40 #include <sys/zfs_znode.h>
41 #include <sys/zfs_dir.h>
43 #include <sys/fs/zfs.h>
45 #include <sys/dsl_prop.h>
46 #include <sys/dsl_dataset.h>
47 #include <sys/dsl_deleg.h>
51 #include <sys/varargs.h>
52 #include <sys/policy.h>
53 #include <sys/atomic.h>
54 #include <sys/mkdev.h>
55 #include <sys/modctl.h>
56 #include <sys/refstr.h>
57 #include <sys/zfs_ioctl.h>
58 #include <sys/zfs_ctldir.h>
59 #include <sys/zfs_fuid.h>
60 #include <sys/bootconf.h>
61 #include <sys/sunddi.h>
63 #include <sys/dmu_objset.h>
64 #include <sys/spa_boot.h>
66 #include "zfs_comutil.h"
69 vfsops_t *zfs_vfsops = NULL;
70 static major_t zfs_major;
71 static minor_t zfs_minor;
72 static kmutex_t zfs_dev_mtx;
74 extern int sys_shutdown;
76 static int zfs_mount(vfs_t *vfsp, vnode_t *mvp, struct mounta *uap, cred_t *cr);
77 static int zfs_umount(vfs_t *vfsp, int fflag, cred_t *cr);
78 static int zfs_mountroot(vfs_t *vfsp, enum whymountroot);
79 static int zfs_root(vfs_t *vfsp, vnode_t **vpp);
80 static int zfs_statvfs(vfs_t *vfsp, struct statvfs64 *statp);
81 static int zfs_vget(vfs_t *vfsp, vnode_t **vpp, fid_t *fidp);
82 static void zfs_freevfs(vfs_t *vfsp);
84 static const fs_operation_def_t zfs_vfsops_template[] = {
85 VFSNAME_MOUNT, { .vfs_mount = zfs_mount },
86 VFSNAME_MOUNTROOT, { .vfs_mountroot = zfs_mountroot },
87 VFSNAME_UNMOUNT, { .vfs_unmount = zfs_umount },
88 VFSNAME_ROOT, { .vfs_root = zfs_root },
89 VFSNAME_STATVFS, { .vfs_statvfs = zfs_statvfs },
90 VFSNAME_SYNC, { .vfs_sync = zfs_sync },
91 VFSNAME_VGET, { .vfs_vget = zfs_vget },
92 VFSNAME_FREEVFS, { .vfs_freevfs = zfs_freevfs },
96 static const fs_operation_def_t zfs_vfsops_eio_template[] = {
97 VFSNAME_FREEVFS, { .vfs_freevfs = zfs_freevfs },
102 * We need to keep a count of active fs's.
103 * This is necessary to prevent our module
104 * from being unloaded after a umount -f
106 static uint32_t zfs_active_fs_count = 0;
108 static char *noatime_cancel[] = { MNTOPT_ATIME, NULL };
109 static char *atime_cancel[] = { MNTOPT_NOATIME, NULL };
110 static char *noxattr_cancel[] = { MNTOPT_XATTR, NULL };
111 static char *xattr_cancel[] = { MNTOPT_NOXATTR, NULL };
114 * MO_DEFAULT is not used since the default value is determined
115 * by the equivalent property.
117 static mntopt_t mntopts[] = {
118 { MNTOPT_NOXATTR, noxattr_cancel, NULL, 0, NULL },
119 { MNTOPT_XATTR, xattr_cancel, NULL, 0, NULL },
120 { MNTOPT_NOATIME, noatime_cancel, NULL, 0, NULL },
121 { MNTOPT_ATIME, atime_cancel, NULL, 0, NULL }
124 static mntopts_t zfs_mntopts = {
125 sizeof (mntopts) / sizeof (mntopt_t),
131 zfs_sync(vfs_t *vfsp, short flag, cred_t *cr)
134 * Data integrity is job one. We don't want a compromised kernel
135 * writing to the storage pool, so we never sync during panic.
141 * SYNC_ATTR is used by fsflush() to force old filesystems like UFS
142 * to sync metadata, which they would otherwise cache indefinitely.
143 * Semantically, the only requirement is that the sync be initiated.
144 * The DMU syncs out txgs frequently, so there's nothing to do.
146 if (flag & SYNC_ATTR)
151 * Sync a specific filesystem.
153 zfsvfs_t *zfsvfs = vfsp->vfs_data;
157 dp = dmu_objset_pool(zfsvfs->z_os);
160 * If the system is shutting down, then skip any
161 * filesystems which may exist on a suspended pool.
163 if (sys_shutdown && spa_suspended(dp->dp_spa)) {
168 if (zfsvfs->z_log != NULL)
169 zil_commit(zfsvfs->z_log, 0);
174 * Sync all ZFS filesystems. This is what happens when you
175 * run sync(1M). Unlike other filesystems, ZFS honors the
176 * request by waiting for all pools to commit all dirty data.
185 zfs_create_unique_device(dev_t *dev)
190 ASSERT3U(zfs_minor, <=, MAXMIN32);
191 minor_t start = zfs_minor;
193 mutex_enter(&zfs_dev_mtx);
194 if (zfs_minor >= MAXMIN32) {
196 * If we're still using the real major
197 * keep out of /dev/zfs and /dev/zvol minor
198 * number space. If we're using a getudev()'ed
199 * major number, we can use all of its minors.
201 if (zfs_major == ddi_name_to_major(ZFS_DRIVER))
202 zfs_minor = ZFS_MIN_MINOR;
208 *dev = makedevice(zfs_major, zfs_minor);
209 mutex_exit(&zfs_dev_mtx);
210 } while (vfs_devismounted(*dev) && zfs_minor != start);
211 if (zfs_minor == start) {
213 * We are using all ~262,000 minor numbers for the
214 * current major number. Create a new major number.
216 if ((new_major = getudev()) == (major_t)-1) {
218 "zfs_mount: Can't get unique major "
222 mutex_enter(&zfs_dev_mtx);
223 zfs_major = new_major;
226 mutex_exit(&zfs_dev_mtx);
230 /* CONSTANTCONDITION */
237 atime_changed_cb(void *arg, uint64_t newval)
239 zfsvfs_t *zfsvfs = arg;
241 if (newval == TRUE) {
242 zfsvfs->z_atime = TRUE;
243 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NOATIME);
244 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_ATIME, NULL, 0);
246 zfsvfs->z_atime = FALSE;
247 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_ATIME);
248 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NOATIME, NULL, 0);
253 xattr_changed_cb(void *arg, uint64_t newval)
255 zfsvfs_t *zfsvfs = arg;
257 if (newval == TRUE) {
258 /* XXX locking on vfs_flag? */
259 zfsvfs->z_vfs->vfs_flag |= VFS_XATTR;
260 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NOXATTR);
261 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_XATTR, NULL, 0);
263 /* XXX locking on vfs_flag? */
264 zfsvfs->z_vfs->vfs_flag &= ~VFS_XATTR;
265 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_XATTR);
266 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NOXATTR, NULL, 0);
271 blksz_changed_cb(void *arg, uint64_t newval)
273 zfsvfs_t *zfsvfs = arg;
275 if (newval < SPA_MINBLOCKSIZE ||
276 newval > SPA_MAXBLOCKSIZE || !ISP2(newval))
277 newval = SPA_MAXBLOCKSIZE;
279 zfsvfs->z_max_blksz = newval;
280 zfsvfs->z_vfs->vfs_bsize = newval;
284 readonly_changed_cb(void *arg, uint64_t newval)
286 zfsvfs_t *zfsvfs = arg;
289 /* XXX locking on vfs_flag? */
290 zfsvfs->z_vfs->vfs_flag |= VFS_RDONLY;
291 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_RW);
292 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_RO, NULL, 0);
294 /* XXX locking on vfs_flag? */
295 zfsvfs->z_vfs->vfs_flag &= ~VFS_RDONLY;
296 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_RO);
297 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_RW, NULL, 0);
302 devices_changed_cb(void *arg, uint64_t newval)
304 zfsvfs_t *zfsvfs = arg;
306 if (newval == FALSE) {
307 zfsvfs->z_vfs->vfs_flag |= VFS_NODEVICES;
308 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_DEVICES);
309 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NODEVICES, NULL, 0);
311 zfsvfs->z_vfs->vfs_flag &= ~VFS_NODEVICES;
312 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NODEVICES);
313 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_DEVICES, NULL, 0);
318 setuid_changed_cb(void *arg, uint64_t newval)
320 zfsvfs_t *zfsvfs = arg;
322 if (newval == FALSE) {
323 zfsvfs->z_vfs->vfs_flag |= VFS_NOSETUID;
324 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_SETUID);
325 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NOSETUID, NULL, 0);
327 zfsvfs->z_vfs->vfs_flag &= ~VFS_NOSETUID;
328 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NOSETUID);
329 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_SETUID, NULL, 0);
334 exec_changed_cb(void *arg, uint64_t newval)
336 zfsvfs_t *zfsvfs = arg;
338 if (newval == FALSE) {
339 zfsvfs->z_vfs->vfs_flag |= VFS_NOEXEC;
340 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_EXEC);
341 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NOEXEC, NULL, 0);
343 zfsvfs->z_vfs->vfs_flag &= ~VFS_NOEXEC;
344 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NOEXEC);
345 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_EXEC, NULL, 0);
350 * The nbmand mount option can be changed at mount time.
351 * We can't allow it to be toggled on live file systems or incorrect
352 * behavior may be seen from cifs clients
354 * This property isn't registered via dsl_prop_register(), but this callback
355 * will be called when a file system is first mounted
358 nbmand_changed_cb(void *arg, uint64_t newval)
360 zfsvfs_t *zfsvfs = arg;
361 if (newval == FALSE) {
362 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NBMAND);
363 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NONBMAND, NULL, 0);
365 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NONBMAND);
366 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NBMAND, NULL, 0);
371 snapdir_changed_cb(void *arg, uint64_t newval)
373 zfsvfs_t *zfsvfs = arg;
375 zfsvfs->z_show_ctldir = newval;
379 vscan_changed_cb(void *arg, uint64_t newval)
381 zfsvfs_t *zfsvfs = arg;
383 zfsvfs->z_vscan = newval;
387 acl_inherit_changed_cb(void *arg, uint64_t newval)
389 zfsvfs_t *zfsvfs = arg;
391 zfsvfs->z_acl_inherit = newval;
395 zfs_register_callbacks(vfs_t *vfsp)
397 struct dsl_dataset *ds = NULL;
399 zfsvfs_t *zfsvfs = NULL;
401 int readonly, do_readonly = B_FALSE;
402 int setuid, do_setuid = B_FALSE;
403 int exec, do_exec = B_FALSE;
404 int devices, do_devices = B_FALSE;
405 int xattr, do_xattr = B_FALSE;
406 int atime, do_atime = B_FALSE;
410 zfsvfs = vfsp->vfs_data;
415 * The act of registering our callbacks will destroy any mount
416 * options we may have. In order to enable temporary overrides
417 * of mount options, we stash away the current values and
418 * restore them after we register the callbacks.
420 if (vfs_optionisset(vfsp, MNTOPT_RO, NULL) ||
421 !spa_writeable(dmu_objset_spa(os))) {
423 do_readonly = B_TRUE;
424 } else if (vfs_optionisset(vfsp, MNTOPT_RW, NULL)) {
426 do_readonly = B_TRUE;
428 if (vfs_optionisset(vfsp, MNTOPT_NOSUID, NULL)) {
434 if (vfs_optionisset(vfsp, MNTOPT_NODEVICES, NULL)) {
437 } else if (vfs_optionisset(vfsp, MNTOPT_DEVICES, NULL)) {
442 if (vfs_optionisset(vfsp, MNTOPT_NOSETUID, NULL)) {
445 } else if (vfs_optionisset(vfsp, MNTOPT_SETUID, NULL)) {
450 if (vfs_optionisset(vfsp, MNTOPT_NOEXEC, NULL)) {
453 } else if (vfs_optionisset(vfsp, MNTOPT_EXEC, NULL)) {
457 if (vfs_optionisset(vfsp, MNTOPT_NOXATTR, NULL)) {
460 } else if (vfs_optionisset(vfsp, MNTOPT_XATTR, NULL)) {
464 if (vfs_optionisset(vfsp, MNTOPT_NOATIME, NULL)) {
467 } else if (vfs_optionisset(vfsp, MNTOPT_ATIME, NULL)) {
473 * nbmand is a special property. It can only be changed at
476 * This is weird, but it is documented to only be changeable
479 if (vfs_optionisset(vfsp, MNTOPT_NONBMAND, NULL)) {
481 } else if (vfs_optionisset(vfsp, MNTOPT_NBMAND, NULL)) {
484 char osname[MAXNAMELEN];
486 dmu_objset_name(os, osname);
487 if (error = dsl_prop_get_integer(osname, "nbmand", &nbmand,
494 * Register property callbacks.
496 * It would probably be fine to just check for i/o error from
497 * the first prop_register(), but I guess I like to go
500 ds = dmu_objset_ds(os);
501 error = dsl_prop_register(ds, "atime", atime_changed_cb, zfsvfs);
502 error = error ? error : dsl_prop_register(ds,
503 "xattr", xattr_changed_cb, zfsvfs);
504 error = error ? error : dsl_prop_register(ds,
505 "recordsize", blksz_changed_cb, zfsvfs);
506 error = error ? error : dsl_prop_register(ds,
507 "readonly", readonly_changed_cb, zfsvfs);
508 error = error ? error : dsl_prop_register(ds,
509 "devices", devices_changed_cb, zfsvfs);
510 error = error ? error : dsl_prop_register(ds,
511 "setuid", setuid_changed_cb, zfsvfs);
512 error = error ? error : dsl_prop_register(ds,
513 "exec", exec_changed_cb, zfsvfs);
514 error = error ? error : dsl_prop_register(ds,
515 "snapdir", snapdir_changed_cb, zfsvfs);
516 error = error ? error : dsl_prop_register(ds,
517 "aclinherit", acl_inherit_changed_cb, zfsvfs);
518 error = error ? error : dsl_prop_register(ds,
519 "vscan", vscan_changed_cb, zfsvfs);
524 * Invoke our callbacks to restore temporary mount options.
527 readonly_changed_cb(zfsvfs, readonly);
529 setuid_changed_cb(zfsvfs, setuid);
531 exec_changed_cb(zfsvfs, exec);
533 devices_changed_cb(zfsvfs, devices);
535 xattr_changed_cb(zfsvfs, xattr);
537 atime_changed_cb(zfsvfs, atime);
539 nbmand_changed_cb(zfsvfs, nbmand);
545 * We may attempt to unregister some callbacks that are not
546 * registered, but this is OK; it will simply return ENOMSG,
547 * which we will ignore.
549 (void) dsl_prop_unregister(ds, "atime", atime_changed_cb, zfsvfs);
550 (void) dsl_prop_unregister(ds, "xattr", xattr_changed_cb, zfsvfs);
551 (void) dsl_prop_unregister(ds, "recordsize", blksz_changed_cb, zfsvfs);
552 (void) dsl_prop_unregister(ds, "readonly", readonly_changed_cb, zfsvfs);
553 (void) dsl_prop_unregister(ds, "devices", devices_changed_cb, zfsvfs);
554 (void) dsl_prop_unregister(ds, "setuid", setuid_changed_cb, zfsvfs);
555 (void) dsl_prop_unregister(ds, "exec", exec_changed_cb, zfsvfs);
556 (void) dsl_prop_unregister(ds, "snapdir", snapdir_changed_cb, zfsvfs);
557 (void) dsl_prop_unregister(ds, "aclinherit", acl_inherit_changed_cb,
559 (void) dsl_prop_unregister(ds, "vscan", vscan_changed_cb, zfsvfs);
565 zfs_space_delta_cb(dmu_object_type_t bonustype, void *data,
566 uint64_t *userp, uint64_t *groupp)
568 znode_phys_t *znp = data;
572 * Is it a valid type of object to track?
574 if (bonustype != DMU_OT_ZNODE && bonustype != DMU_OT_SA)
578 * If we have a NULL data pointer
579 * then assume the id's aren't changing and
580 * return EEXIST to the dmu to let it know to
586 if (bonustype == DMU_OT_ZNODE) {
587 *userp = znp->zp_uid;
588 *groupp = znp->zp_gid;
592 ASSERT(bonustype == DMU_OT_SA);
593 hdrsize = sa_hdrsize(data);
596 *userp = *((uint64_t *)((uintptr_t)data + hdrsize +
598 *groupp = *((uint64_t *)((uintptr_t)data + hdrsize +
602 * This should only happen for newly created
603 * files that haven't had the znode data filled
614 fuidstr_to_sid(zfsvfs_t *zfsvfs, const char *fuidstr,
615 char *domainbuf, int buflen, uid_t *ridp)
620 fuid = strtonum(fuidstr, NULL);
622 domain = zfs_fuid_find_by_idx(zfsvfs, FUID_INDEX(fuid));
624 (void) strlcpy(domainbuf, domain, buflen);
627 *ridp = FUID_RID(fuid);
631 zfs_userquota_prop_to_obj(zfsvfs_t *zfsvfs, zfs_userquota_prop_t type)
634 case ZFS_PROP_USERUSED:
635 return (DMU_USERUSED_OBJECT);
636 case ZFS_PROP_GROUPUSED:
637 return (DMU_GROUPUSED_OBJECT);
638 case ZFS_PROP_USERQUOTA:
639 return (zfsvfs->z_userquota_obj);
640 case ZFS_PROP_GROUPQUOTA:
641 return (zfsvfs->z_groupquota_obj);
647 zfs_userspace_many(zfsvfs_t *zfsvfs, zfs_userquota_prop_t type,
648 uint64_t *cookiep, void *vbuf, uint64_t *bufsizep)
653 zfs_useracct_t *buf = vbuf;
656 if (!dmu_objset_userspace_present(zfsvfs->z_os))
659 obj = zfs_userquota_prop_to_obj(zfsvfs, type);
665 for (zap_cursor_init_serialized(&zc, zfsvfs->z_os, obj, *cookiep);
666 (error = zap_cursor_retrieve(&zc, &za)) == 0;
667 zap_cursor_advance(&zc)) {
668 if ((uintptr_t)buf - (uintptr_t)vbuf + sizeof (zfs_useracct_t) >
672 fuidstr_to_sid(zfsvfs, za.za_name,
673 buf->zu_domain, sizeof (buf->zu_domain), &buf->zu_rid);
675 buf->zu_space = za.za_first_integer;
681 ASSERT3U((uintptr_t)buf - (uintptr_t)vbuf, <=, *bufsizep);
682 *bufsizep = (uintptr_t)buf - (uintptr_t)vbuf;
683 *cookiep = zap_cursor_serialize(&zc);
684 zap_cursor_fini(&zc);
689 * buf must be big enough (eg, 32 bytes)
692 id_to_fuidstr(zfsvfs_t *zfsvfs, const char *domain, uid_t rid,
693 char *buf, boolean_t addok)
698 if (domain && domain[0]) {
699 domainid = zfs_fuid_find_by_domain(zfsvfs, domain, NULL, addok);
703 fuid = FUID_ENCODE(domainid, rid);
704 (void) sprintf(buf, "%llx", (longlong_t)fuid);
709 zfs_userspace_one(zfsvfs_t *zfsvfs, zfs_userquota_prop_t type,
710 const char *domain, uint64_t rid, uint64_t *valp)
718 if (!dmu_objset_userspace_present(zfsvfs->z_os))
721 obj = zfs_userquota_prop_to_obj(zfsvfs, type);
725 err = id_to_fuidstr(zfsvfs, domain, rid, buf, B_FALSE);
729 err = zap_lookup(zfsvfs->z_os, obj, buf, 8, 1, valp);
736 zfs_set_userquota(zfsvfs_t *zfsvfs, zfs_userquota_prop_t type,
737 const char *domain, uint64_t rid, uint64_t quota)
743 boolean_t fuid_dirtied;
745 if (type != ZFS_PROP_USERQUOTA && type != ZFS_PROP_GROUPQUOTA)
748 if (zfsvfs->z_version < ZPL_VERSION_USERSPACE)
751 objp = (type == ZFS_PROP_USERQUOTA) ? &zfsvfs->z_userquota_obj :
752 &zfsvfs->z_groupquota_obj;
754 err = id_to_fuidstr(zfsvfs, domain, rid, buf, B_TRUE);
757 fuid_dirtied = zfsvfs->z_fuid_dirty;
759 tx = dmu_tx_create(zfsvfs->z_os);
760 dmu_tx_hold_zap(tx, *objp ? *objp : DMU_NEW_OBJECT, B_TRUE, NULL);
762 dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, B_TRUE,
763 zfs_userquota_prop_prefixes[type]);
766 zfs_fuid_txhold(zfsvfs, tx);
767 err = dmu_tx_assign(tx, TXG_WAIT);
773 mutex_enter(&zfsvfs->z_lock);
775 *objp = zap_create(zfsvfs->z_os, DMU_OT_USERGROUP_QUOTA,
777 VERIFY(0 == zap_add(zfsvfs->z_os, MASTER_NODE_OBJ,
778 zfs_userquota_prop_prefixes[type], 8, 1, objp, tx));
780 mutex_exit(&zfsvfs->z_lock);
783 err = zap_remove(zfsvfs->z_os, *objp, buf, tx);
787 err = zap_update(zfsvfs->z_os, *objp, buf, 8, 1, "a, tx);
791 zfs_fuid_sync(zfsvfs, tx);
797 zfs_fuid_overquota(zfsvfs_t *zfsvfs, boolean_t isgroup, uint64_t fuid)
800 uint64_t used, quota, usedobj, quotaobj;
803 usedobj = isgroup ? DMU_GROUPUSED_OBJECT : DMU_USERUSED_OBJECT;
804 quotaobj = isgroup ? zfsvfs->z_groupquota_obj : zfsvfs->z_userquota_obj;
806 if (quotaobj == 0 || zfsvfs->z_replay)
809 (void) sprintf(buf, "%llx", (longlong_t)fuid);
810 err = zap_lookup(zfsvfs->z_os, quotaobj, buf, 8, 1, "a);
814 err = zap_lookup(zfsvfs->z_os, usedobj, buf, 8, 1, &used);
817 return (used >= quota);
821 zfs_owner_overquota(zfsvfs_t *zfsvfs, znode_t *zp, boolean_t isgroup)
826 quotaobj = isgroup ? zfsvfs->z_groupquota_obj : zfsvfs->z_userquota_obj;
828 fuid = isgroup ? zp->z_gid : zp->z_uid;
830 if (quotaobj == 0 || zfsvfs->z_replay)
833 return (zfs_fuid_overquota(zfsvfs, isgroup, fuid));
837 zfsvfs_create(const char *osname, zfsvfs_t **zfvp)
845 zfsvfs = kmem_zalloc(sizeof (zfsvfs_t), KM_SLEEP);
848 * We claim to always be readonly so we can open snapshots;
849 * other ZPL code will prevent us from writing to snapshots.
851 error = dmu_objset_own(osname, DMU_OST_ZFS, B_TRUE, zfsvfs, &os);
853 kmem_free(zfsvfs, sizeof (zfsvfs_t));
858 * Initialize the zfs-specific filesystem structure.
859 * Should probably make this a kmem cache, shuffle fields,
860 * and just bzero up to z_hold_mtx[].
862 zfsvfs->z_vfs = NULL;
863 zfsvfs->z_parent = zfsvfs;
864 zfsvfs->z_max_blksz = SPA_MAXBLOCKSIZE;
865 zfsvfs->z_show_ctldir = ZFS_SNAPDIR_VISIBLE;
868 error = zfs_get_zplprop(os, ZFS_PROP_VERSION, &zfsvfs->z_version);
871 } else if (zfsvfs->z_version >
872 zfs_zpl_version_map(spa_version(dmu_objset_spa(os)))) {
873 (void) printf("Can't mount a version %lld file system "
874 "on a version %lld pool\n. Pool must be upgraded to mount "
875 "this file system.", (u_longlong_t)zfsvfs->z_version,
876 (u_longlong_t)spa_version(dmu_objset_spa(os)));
880 if ((error = zfs_get_zplprop(os, ZFS_PROP_NORMALIZE, &zval)) != 0)
882 zfsvfs->z_norm = (int)zval;
884 if ((error = zfs_get_zplprop(os, ZFS_PROP_UTF8ONLY, &zval)) != 0)
886 zfsvfs->z_utf8 = (zval != 0);
888 if ((error = zfs_get_zplprop(os, ZFS_PROP_CASE, &zval)) != 0)
890 zfsvfs->z_case = (uint_t)zval;
893 * Fold case on file systems that are always or sometimes case
896 if (zfsvfs->z_case == ZFS_CASE_INSENSITIVE ||
897 zfsvfs->z_case == ZFS_CASE_MIXED)
898 zfsvfs->z_norm |= U8_TEXTPREP_TOUPPER;
900 zfsvfs->z_use_fuids = USE_FUIDS(zfsvfs->z_version, zfsvfs->z_os);
901 zfsvfs->z_use_sa = USE_SA(zfsvfs->z_version, zfsvfs->z_os);
903 if (zfsvfs->z_use_sa) {
904 /* should either have both of these objects or none */
905 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_SA_ATTRS, 8, 1,
911 * Pre SA versions file systems should never touch
912 * either the attribute registration or layout objects.
917 error = sa_setup(os, sa_obj, zfs_attr_table, ZPL_END,
918 &zfsvfs->z_attr_table);
922 if (zfsvfs->z_version >= ZPL_VERSION_SA)
923 sa_register_update_callback(os, zfs_sa_upgrade);
925 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_ROOT_OBJ, 8, 1,
929 ASSERT(zfsvfs->z_root != 0);
931 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_UNLINKED_SET, 8, 1,
932 &zfsvfs->z_unlinkedobj);
936 error = zap_lookup(os, MASTER_NODE_OBJ,
937 zfs_userquota_prop_prefixes[ZFS_PROP_USERQUOTA],
938 8, 1, &zfsvfs->z_userquota_obj);
939 if (error && error != ENOENT)
942 error = zap_lookup(os, MASTER_NODE_OBJ,
943 zfs_userquota_prop_prefixes[ZFS_PROP_GROUPQUOTA],
944 8, 1, &zfsvfs->z_groupquota_obj);
945 if (error && error != ENOENT)
948 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_FUID_TABLES, 8, 1,
949 &zfsvfs->z_fuid_obj);
950 if (error && error != ENOENT)
953 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_SHARES_DIR, 8, 1,
954 &zfsvfs->z_shares_dir);
955 if (error && error != ENOENT)
958 mutex_init(&zfsvfs->z_znodes_lock, NULL, MUTEX_DEFAULT, NULL);
959 mutex_init(&zfsvfs->z_lock, NULL, MUTEX_DEFAULT, NULL);
960 list_create(&zfsvfs->z_all_znodes, sizeof (znode_t),
961 offsetof(znode_t, z_link_node));
962 rrw_init(&zfsvfs->z_teardown_lock);
963 rw_init(&zfsvfs->z_teardown_inactive_lock, NULL, RW_DEFAULT, NULL);
964 rw_init(&zfsvfs->z_fuid_lock, NULL, RW_DEFAULT, NULL);
965 for (i = 0; i != ZFS_OBJ_MTX_SZ; i++)
966 mutex_init(&zfsvfs->z_hold_mtx[i], NULL, MUTEX_DEFAULT, NULL);
972 dmu_objset_disown(os, zfsvfs);
974 kmem_free(zfsvfs, sizeof (zfsvfs_t));
979 zfsvfs_setup(zfsvfs_t *zfsvfs, boolean_t mounting)
983 error = zfs_register_callbacks(zfsvfs->z_vfs);
988 * Set the objset user_ptr to track its zfsvfs.
990 mutex_enter(&zfsvfs->z_os->os_user_ptr_lock);
991 dmu_objset_set_user(zfsvfs->z_os, zfsvfs);
992 mutex_exit(&zfsvfs->z_os->os_user_ptr_lock);
994 zfsvfs->z_log = zil_open(zfsvfs->z_os, zfs_get_data);
997 * If we are not mounting (ie: online recv), then we don't
998 * have to worry about replaying the log as we blocked all
999 * operations out since we closed the ZIL.
1005 * During replay we remove the read only flag to
1006 * allow replays to succeed.
1008 readonly = zfsvfs->z_vfs->vfs_flag & VFS_RDONLY;
1010 zfsvfs->z_vfs->vfs_flag &= ~VFS_RDONLY;
1012 zfs_unlinked_drain(zfsvfs);
1015 * Parse and replay the intent log.
1017 * Because of ziltest, this must be done after
1018 * zfs_unlinked_drain(). (Further note: ziltest
1019 * doesn't use readonly mounts, where
1020 * zfs_unlinked_drain() isn't called.) This is because
1021 * ziltest causes spa_sync() to think it's committed,
1022 * but actually it is not, so the intent log contains
1023 * many txg's worth of changes.
1025 * In particular, if object N is in the unlinked set in
1026 * the last txg to actually sync, then it could be
1027 * actually freed in a later txg and then reallocated
1028 * in a yet later txg. This would write a "create
1029 * object N" record to the intent log. Normally, this
1030 * would be fine because the spa_sync() would have
1031 * written out the fact that object N is free, before
1032 * we could write the "create object N" intent log
1035 * But when we are in ziltest mode, we advance the "open
1036 * txg" without actually spa_sync()-ing the changes to
1037 * disk. So we would see that object N is still
1038 * allocated and in the unlinked set, and there is an
1039 * intent log record saying to allocate it.
1041 if (spa_writeable(dmu_objset_spa(zfsvfs->z_os))) {
1042 if (zil_replay_disable) {
1043 zil_destroy(zfsvfs->z_log, B_FALSE);
1045 zfsvfs->z_replay = B_TRUE;
1046 zil_replay(zfsvfs->z_os, zfsvfs,
1048 zfsvfs->z_replay = B_FALSE;
1051 zfsvfs->z_vfs->vfs_flag |= readonly; /* restore readonly bit */
1058 zfsvfs_free(zfsvfs_t *zfsvfs)
1061 extern krwlock_t zfsvfs_lock; /* in zfs_znode.c */
1064 * This is a barrier to prevent the filesystem from going away in
1065 * zfs_znode_move() until we can safely ensure that the filesystem is
1066 * not unmounted. We consider the filesystem valid before the barrier
1067 * and invalid after the barrier.
1069 rw_enter(&zfsvfs_lock, RW_READER);
1070 rw_exit(&zfsvfs_lock);
1072 zfs_fuid_destroy(zfsvfs);
1074 mutex_destroy(&zfsvfs->z_znodes_lock);
1075 mutex_destroy(&zfsvfs->z_lock);
1076 list_destroy(&zfsvfs->z_all_znodes);
1077 rrw_destroy(&zfsvfs->z_teardown_lock);
1078 rw_destroy(&zfsvfs->z_teardown_inactive_lock);
1079 rw_destroy(&zfsvfs->z_fuid_lock);
1080 for (i = 0; i != ZFS_OBJ_MTX_SZ; i++)
1081 mutex_destroy(&zfsvfs->z_hold_mtx[i]);
1082 kmem_free(zfsvfs, sizeof (zfsvfs_t));
1086 zfs_set_fuid_feature(zfsvfs_t *zfsvfs)
1088 zfsvfs->z_use_fuids = USE_FUIDS(zfsvfs->z_version, zfsvfs->z_os);
1089 if (zfsvfs->z_use_fuids && zfsvfs->z_vfs) {
1090 vfs_set_feature(zfsvfs->z_vfs, VFSFT_XVATTR);
1091 vfs_set_feature(zfsvfs->z_vfs, VFSFT_SYSATTR_VIEWS);
1092 vfs_set_feature(zfsvfs->z_vfs, VFSFT_ACEMASKONACCESS);
1093 vfs_set_feature(zfsvfs->z_vfs, VFSFT_ACLONCREATE);
1094 vfs_set_feature(zfsvfs->z_vfs, VFSFT_ACCESS_FILTER);
1095 vfs_set_feature(zfsvfs->z_vfs, VFSFT_REPARSE);
1097 zfsvfs->z_use_sa = USE_SA(zfsvfs->z_version, zfsvfs->z_os);
1101 zfs_domount(vfs_t *vfsp, char *osname)
1104 uint64_t recordsize, fsid_guid;
1111 error = zfsvfs_create(osname, &zfsvfs);
1114 zfsvfs->z_vfs = vfsp;
1116 /* Initialize the generic filesystem structure. */
1117 vfsp->vfs_bcount = 0;
1118 vfsp->vfs_data = NULL;
1120 if (zfs_create_unique_device(&mount_dev) == -1) {
1124 ASSERT(vfs_devismounted(mount_dev) == 0);
1126 if (error = dsl_prop_get_integer(osname, "recordsize", &recordsize,
1130 vfsp->vfs_dev = mount_dev;
1131 vfsp->vfs_fstype = zfsfstype;
1132 vfsp->vfs_bsize = recordsize;
1133 vfsp->vfs_flag |= VFS_NOTRUNC;
1134 vfsp->vfs_data = zfsvfs;
1137 * The fsid is 64 bits, composed of an 8-bit fs type, which
1138 * separates our fsid from any other filesystem types, and a
1139 * 56-bit objset unique ID. The objset unique ID is unique to
1140 * all objsets open on this system, provided by unique_create().
1141 * The 8-bit fs type must be put in the low bits of fsid[1]
1142 * because that's where other Solaris filesystems put it.
1144 fsid_guid = dmu_objset_fsid_guid(zfsvfs->z_os);
1145 ASSERT((fsid_guid & ~((1ULL<<56)-1)) == 0);
1146 vfsp->vfs_fsid.val[0] = fsid_guid;
1147 vfsp->vfs_fsid.val[1] = ((fsid_guid>>32) << 8) |
1151 * Set features for file system.
1153 zfs_set_fuid_feature(zfsvfs);
1154 if (zfsvfs->z_case == ZFS_CASE_INSENSITIVE) {
1155 vfs_set_feature(vfsp, VFSFT_DIRENTFLAGS);
1156 vfs_set_feature(vfsp, VFSFT_CASEINSENSITIVE);
1157 vfs_set_feature(vfsp, VFSFT_NOCASESENSITIVE);
1158 } else if (zfsvfs->z_case == ZFS_CASE_MIXED) {
1159 vfs_set_feature(vfsp, VFSFT_DIRENTFLAGS);
1160 vfs_set_feature(vfsp, VFSFT_CASEINSENSITIVE);
1162 vfs_set_feature(vfsp, VFSFT_ZEROCOPY_SUPPORTED);
1164 if (dmu_objset_is_snapshot(zfsvfs->z_os)) {
1167 atime_changed_cb(zfsvfs, B_FALSE);
1168 readonly_changed_cb(zfsvfs, B_TRUE);
1169 if (error = dsl_prop_get_integer(osname, "xattr", &pval, NULL))
1171 xattr_changed_cb(zfsvfs, pval);
1172 zfsvfs->z_issnap = B_TRUE;
1173 zfsvfs->z_os->os_sync = ZFS_SYNC_DISABLED;
1175 mutex_enter(&zfsvfs->z_os->os_user_ptr_lock);
1176 dmu_objset_set_user(zfsvfs->z_os, zfsvfs);
1177 mutex_exit(&zfsvfs->z_os->os_user_ptr_lock);
1179 error = zfsvfs_setup(zfsvfs, B_TRUE);
1182 if (!zfsvfs->z_issnap)
1183 zfsctl_create(zfsvfs);
1186 dmu_objset_disown(zfsvfs->z_os, zfsvfs);
1187 zfsvfs_free(zfsvfs);
1189 atomic_add_32(&zfs_active_fs_count, 1);
1196 zfs_unregister_callbacks(zfsvfs_t *zfsvfs)
1198 objset_t *os = zfsvfs->z_os;
1199 struct dsl_dataset *ds;
1202 * Unregister properties.
1204 if (!dmu_objset_is_snapshot(os)) {
1205 ds = dmu_objset_ds(os);
1206 VERIFY(dsl_prop_unregister(ds, "atime", atime_changed_cb,
1209 VERIFY(dsl_prop_unregister(ds, "xattr", xattr_changed_cb,
1212 VERIFY(dsl_prop_unregister(ds, "recordsize", blksz_changed_cb,
1215 VERIFY(dsl_prop_unregister(ds, "readonly", readonly_changed_cb,
1218 VERIFY(dsl_prop_unregister(ds, "devices", devices_changed_cb,
1221 VERIFY(dsl_prop_unregister(ds, "setuid", setuid_changed_cb,
1224 VERIFY(dsl_prop_unregister(ds, "exec", exec_changed_cb,
1227 VERIFY(dsl_prop_unregister(ds, "snapdir", snapdir_changed_cb,
1230 VERIFY(dsl_prop_unregister(ds, "aclinherit",
1231 acl_inherit_changed_cb, zfsvfs) == 0);
1233 VERIFY(dsl_prop_unregister(ds, "vscan",
1234 vscan_changed_cb, zfsvfs) == 0);
1239 * Convert a decimal digit string to a uint64_t integer.
1242 str_to_uint64(char *str, uint64_t *objnum)
1247 if (*str < '0' || *str > '9')
1250 num = num*10 + *str++ - '0';
1258 * The boot path passed from the boot loader is in the form of
1259 * "rootpool-name/root-filesystem-object-number'. Convert this
1260 * string to a dataset name: "rootpool-name/root-filesystem-name".
1263 zfs_parse_bootfs(char *bpath, char *outpath)
1269 if (*bpath == 0 || *bpath == '/')
1272 (void) strcpy(outpath, bpath);
1274 slashp = strchr(bpath, '/');
1276 /* if no '/', just return the pool name */
1277 if (slashp == NULL) {
1281 /* if not a number, just return the root dataset name */
1282 if (str_to_uint64(slashp+1, &objnum)) {
1287 error = dsl_dsobj_to_dsname(bpath, objnum, outpath);
1294 * zfs_check_global_label:
1295 * Check that the hex label string is appropriate for the dataset
1296 * being mounted into the global_zone proper.
1298 * Return an error if the hex label string is not default or
1299 * admin_low/admin_high. For admin_low labels, the corresponding
1300 * dataset must be readonly.
1303 zfs_check_global_label(const char *dsname, const char *hexsl)
1305 if (strcasecmp(hexsl, ZFS_MLSLABEL_DEFAULT) == 0)
1307 if (strcasecmp(hexsl, ADMIN_HIGH) == 0)
1309 if (strcasecmp(hexsl, ADMIN_LOW) == 0) {
1310 /* must be readonly */
1313 if (dsl_prop_get_integer(dsname,
1314 zfs_prop_to_name(ZFS_PROP_READONLY), &rdonly, NULL))
1316 return (rdonly ? 0 : EACCES);
1322 * zfs_mount_label_policy:
1323 * Determine whether the mount is allowed according to MAC check.
1324 * by comparing (where appropriate) label of the dataset against
1325 * the label of the zone being mounted into. If the dataset has
1326 * no label, create one.
1329 * 0 : access allowed
1330 * >0 : error code, such as EACCES
1333 zfs_mount_label_policy(vfs_t *vfsp, char *osname)
1336 zone_t *mntzone = NULL;
1337 ts_label_t *mnt_tsl;
1340 char ds_hexsl[MAXNAMELEN];
1342 retv = EACCES; /* assume the worst */
1345 * Start by getting the dataset label if it exists.
1347 error = dsl_prop_get(osname, zfs_prop_to_name(ZFS_PROP_MLSLABEL),
1348 1, sizeof (ds_hexsl), &ds_hexsl, NULL);
1353 * If labeling is NOT enabled, then disallow the mount of datasets
1354 * which have a non-default label already. No other label checks
1357 if (!is_system_labeled()) {
1358 if (strcasecmp(ds_hexsl, ZFS_MLSLABEL_DEFAULT) == 0)
1364 * Get the label of the mountpoint. If mounting into the global
1365 * zone (i.e. mountpoint is not within an active zone and the
1366 * zoned property is off), the label must be default or
1367 * admin_low/admin_high only; no other checks are needed.
1369 mntzone = zone_find_by_any_path(refstr_value(vfsp->vfs_mntpt), B_FALSE);
1370 if (mntzone->zone_id == GLOBAL_ZONEID) {
1375 if (dsl_prop_get_integer(osname,
1376 zfs_prop_to_name(ZFS_PROP_ZONED), &zoned, NULL))
1379 return (zfs_check_global_label(osname, ds_hexsl));
1382 * This is the case of a zone dataset being mounted
1383 * initially, before the zone has been fully created;
1384 * allow this mount into global zone.
1389 mnt_tsl = mntzone->zone_slabel;
1390 ASSERT(mnt_tsl != NULL);
1391 label_hold(mnt_tsl);
1392 mnt_sl = label2bslabel(mnt_tsl);
1394 if (strcasecmp(ds_hexsl, ZFS_MLSLABEL_DEFAULT) == 0) {
1396 * The dataset doesn't have a real label, so fabricate one.
1400 if (l_to_str_internal(mnt_sl, &str) == 0 &&
1401 dsl_prop_set(osname, zfs_prop_to_name(ZFS_PROP_MLSLABEL),
1402 ZPROP_SRC_LOCAL, 1, strlen(str) + 1, str) == 0)
1405 kmem_free(str, strlen(str) + 1);
1406 } else if (hexstr_to_label(ds_hexsl, &ds_sl) == 0) {
1408 * Now compare labels to complete the MAC check. If the
1409 * labels are equal then allow access. If the mountpoint
1410 * label dominates the dataset label, allow readonly access.
1411 * Otherwise, access is denied.
1413 if (blequal(mnt_sl, &ds_sl))
1415 else if (bldominates(mnt_sl, &ds_sl)) {
1416 vfs_setmntopt(vfsp, MNTOPT_RO, NULL, 0);
1421 label_rele(mnt_tsl);
1427 zfs_mountroot(vfs_t *vfsp, enum whymountroot why)
1430 static int zfsrootdone = 0;
1431 zfsvfs_t *zfsvfs = NULL;
1440 * The filesystem that we mount as root is defined in the
1441 * boot property "zfs-bootfs" with a format of
1442 * "poolname/root-dataset-objnum".
1444 if (why == ROOT_INIT) {
1448 * the process of doing a spa_load will require the
1449 * clock to be set before we could (for example) do
1450 * something better by looking at the timestamp on
1451 * an uberblock, so just set it to -1.
1455 if ((zfs_bootfs = spa_get_bootprop("zfs-bootfs")) == NULL) {
1456 cmn_err(CE_NOTE, "spa_get_bootfs: can not get "
1460 zfs_devid = spa_get_bootprop("diskdevid");
1461 error = spa_import_rootpool(rootfs.bo_name, zfs_devid);
1463 spa_free_bootprop(zfs_devid);
1465 spa_free_bootprop(zfs_bootfs);
1466 cmn_err(CE_NOTE, "spa_import_rootpool: error %d",
1470 if (error = zfs_parse_bootfs(zfs_bootfs, rootfs.bo_name)) {
1471 spa_free_bootprop(zfs_bootfs);
1472 cmn_err(CE_NOTE, "zfs_parse_bootfs: error %d",
1477 spa_free_bootprop(zfs_bootfs);
1479 if (error = vfs_lock(vfsp))
1482 if (error = zfs_domount(vfsp, rootfs.bo_name)) {
1483 cmn_err(CE_NOTE, "zfs_domount: error %d", error);
1487 zfsvfs = (zfsvfs_t *)vfsp->vfs_data;
1489 if (error = zfs_zget(zfsvfs, zfsvfs->z_root, &zp)) {
1490 cmn_err(CE_NOTE, "zfs_zget: error %d", error);
1495 mutex_enter(&vp->v_lock);
1496 vp->v_flag |= VROOT;
1497 mutex_exit(&vp->v_lock);
1501 * Leave rootvp held. The root file system is never unmounted.
1504 vfs_add((struct vnode *)0, vfsp,
1505 (vfsp->vfs_flag & VFS_RDONLY) ? MS_RDONLY : 0);
1509 } else if (why == ROOT_REMOUNT) {
1510 readonly_changed_cb(vfsp->vfs_data, B_FALSE);
1511 vfsp->vfs_flag |= VFS_REMOUNT;
1513 /* refresh mount options */
1514 zfs_unregister_callbacks(vfsp->vfs_data);
1515 return (zfs_register_callbacks(vfsp));
1517 } else if (why == ROOT_UNMOUNT) {
1518 zfs_unregister_callbacks((zfsvfs_t *)vfsp->vfs_data);
1519 (void) zfs_sync(vfsp, 0, 0);
1524 * if "why" is equal to anything else other than ROOT_INIT,
1525 * ROOT_REMOUNT, or ROOT_UNMOUNT, we do not support it.
1532 zfs_mount(vfs_t *vfsp, vnode_t *mvp, struct mounta *uap, cred_t *cr)
1537 uio_seg_t fromspace = (uap->flags & MS_SYSSPACE) ?
1538 UIO_SYSSPACE : UIO_USERSPACE;
1541 if (mvp->v_type != VDIR)
1544 mutex_enter(&mvp->v_lock);
1545 if ((uap->flags & MS_REMOUNT) == 0 &&
1546 (uap->flags & MS_OVERLAY) == 0 &&
1547 (mvp->v_count != 1 || (mvp->v_flag & VROOT))) {
1548 mutex_exit(&mvp->v_lock);
1551 mutex_exit(&mvp->v_lock);
1554 * ZFS does not support passing unparsed data in via MS_DATA.
1555 * Users should use the MS_OPTIONSTR interface; this means
1556 * that all option parsing is already done and the options struct
1557 * can be interrogated.
1559 if ((uap->flags & MS_DATA) && uap->datalen > 0)
1563 * Get the objset name (the "special" mount argument).
1565 if (error = pn_get(uap->spec, fromspace, &spn))
1568 osname = spn.pn_path;
1571 * Check for mount privilege?
1573 * If we don't have privilege then see if
1574 * we have local permission to allow it
1576 error = secpolicy_fs_mount(cr, mvp, vfsp);
1578 if (dsl_deleg_access(osname, ZFS_DELEG_PERM_MOUNT, cr) == 0) {
1582 * Make sure user is the owner of the mount point
1583 * or has sufficient privileges.
1586 vattr.va_mask = AT_UID;
1588 if (VOP_GETATTR(mvp, &vattr, 0, cr, NULL)) {
1592 if (secpolicy_vnode_owner(cr, vattr.va_uid) != 0 &&
1593 VOP_ACCESS(mvp, VWRITE, 0, cr, NULL) != 0) {
1596 secpolicy_fs_mount_clearopts(cr, vfsp);
1603 * Refuse to mount a filesystem if we are in a local zone and the
1604 * dataset is not visible.
1606 if (!INGLOBALZONE(curproc) &&
1607 (!zone_dataset_visible(osname, &canwrite) || !canwrite)) {
1612 error = zfs_mount_label_policy(vfsp, osname);
1617 * When doing a remount, we simply refresh our temporary properties
1618 * according to those options set in the current VFS options.
1620 if (uap->flags & MS_REMOUNT) {
1621 /* refresh mount options */
1622 zfs_unregister_callbacks(vfsp->vfs_data);
1623 error = zfs_register_callbacks(vfsp);
1627 error = zfs_domount(vfsp, osname);
1630 * Add an extra VFS_HOLD on our parent vfs so that it can't
1631 * disappear due to a forced unmount.
1633 if (error == 0 && ((zfsvfs_t *)vfsp->vfs_data)->z_issnap)
1634 VFS_HOLD(mvp->v_vfsp);
1642 zfs_statvfs(vfs_t *vfsp, struct statvfs64 *statp)
1644 zfsvfs_t *zfsvfs = vfsp->vfs_data;
1646 uint64_t refdbytes, availbytes, usedobjs, availobjs;
1650 dmu_objset_space(zfsvfs->z_os,
1651 &refdbytes, &availbytes, &usedobjs, &availobjs);
1654 * The underlying storage pool actually uses multiple block sizes.
1655 * We report the fragsize as the smallest block size we support,
1656 * and we report our blocksize as the filesystem's maximum blocksize.
1658 statp->f_frsize = 1UL << SPA_MINBLOCKSHIFT;
1659 statp->f_bsize = zfsvfs->z_max_blksz;
1662 * The following report "total" blocks of various kinds in the
1663 * file system, but reported in terms of f_frsize - the
1667 statp->f_blocks = (refdbytes + availbytes) >> SPA_MINBLOCKSHIFT;
1668 statp->f_bfree = availbytes >> SPA_MINBLOCKSHIFT;
1669 statp->f_bavail = statp->f_bfree; /* no root reservation */
1672 * statvfs() should really be called statufs(), because it assumes
1673 * static metadata. ZFS doesn't preallocate files, so the best
1674 * we can do is report the max that could possibly fit in f_files,
1675 * and that minus the number actually used in f_ffree.
1676 * For f_ffree, report the smaller of the number of object available
1677 * and the number of blocks (each object will take at least a block).
1679 statp->f_ffree = MIN(availobjs, statp->f_bfree);
1680 statp->f_favail = statp->f_ffree; /* no "root reservation" */
1681 statp->f_files = statp->f_ffree + usedobjs;
1683 (void) cmpldev(&d32, vfsp->vfs_dev);
1684 statp->f_fsid = d32;
1687 * We're a zfs filesystem.
1689 (void) strcpy(statp->f_basetype, vfssw[vfsp->vfs_fstype].vsw_name);
1691 statp->f_flag = vf_to_stf(vfsp->vfs_flag);
1693 statp->f_namemax = ZFS_MAXNAMELEN;
1696 * We have all of 32 characters to stuff a string here.
1697 * Is there anything useful we could/should provide?
1699 bzero(statp->f_fstr, sizeof (statp->f_fstr));
1706 zfs_root(vfs_t *vfsp, vnode_t **vpp)
1708 zfsvfs_t *zfsvfs = vfsp->vfs_data;
1714 error = zfs_zget(zfsvfs, zfsvfs->z_root, &rootzp);
1716 *vpp = ZTOV(rootzp);
1723 * Teardown the zfsvfs::z_os.
1725 * Note, if 'unmounting' if FALSE, we return with the 'z_teardown_lock'
1726 * and 'z_teardown_inactive_lock' held.
1729 zfsvfs_teardown(zfsvfs_t *zfsvfs, boolean_t unmounting)
1733 rrw_enter(&zfsvfs->z_teardown_lock, RW_WRITER, FTAG);
1737 * We purge the parent filesystem's vfsp as the parent
1738 * filesystem and all of its snapshots have their vnode's
1739 * v_vfsp set to the parent's filesystem's vfsp. Note,
1740 * 'z_parent' is self referential for non-snapshots.
1742 (void) dnlc_purge_vfsp(zfsvfs->z_parent->z_vfs, 0);
1746 * Close the zil. NB: Can't close the zil while zfs_inactive
1747 * threads are blocked as zil_close can call zfs_inactive.
1749 if (zfsvfs->z_log) {
1750 zil_close(zfsvfs->z_log);
1751 zfsvfs->z_log = NULL;
1754 rw_enter(&zfsvfs->z_teardown_inactive_lock, RW_WRITER);
1757 * If we are not unmounting (ie: online recv) and someone already
1758 * unmounted this file system while we were doing the switcheroo,
1759 * or a reopen of z_os failed then just bail out now.
1761 if (!unmounting && (zfsvfs->z_unmounted || zfsvfs->z_os == NULL)) {
1762 rw_exit(&zfsvfs->z_teardown_inactive_lock);
1763 rrw_exit(&zfsvfs->z_teardown_lock, FTAG);
1768 * At this point there are no vops active, and any new vops will
1769 * fail with EIO since we have z_teardown_lock for writer (only
1770 * relavent for forced unmount).
1772 * Release all holds on dbufs.
1774 mutex_enter(&zfsvfs->z_znodes_lock);
1775 for (zp = list_head(&zfsvfs->z_all_znodes); zp != NULL;
1776 zp = list_next(&zfsvfs->z_all_znodes, zp))
1778 ASSERT(ZTOV(zp)->v_count > 0);
1779 zfs_znode_dmu_fini(zp);
1781 mutex_exit(&zfsvfs->z_znodes_lock);
1784 * If we are unmounting, set the unmounted flag and let new vops
1785 * unblock. zfs_inactive will have the unmounted behavior, and all
1786 * other vops will fail with EIO.
1789 zfsvfs->z_unmounted = B_TRUE;
1790 rrw_exit(&zfsvfs->z_teardown_lock, FTAG);
1791 rw_exit(&zfsvfs->z_teardown_inactive_lock);
1795 * z_os will be NULL if there was an error in attempting to reopen
1796 * zfsvfs, so just return as the properties had already been
1797 * unregistered and cached data had been evicted before.
1799 if (zfsvfs->z_os == NULL)
1803 * Unregister properties.
1805 zfs_unregister_callbacks(zfsvfs);
1810 if (dmu_objset_is_dirty_anywhere(zfsvfs->z_os))
1811 if (!(zfsvfs->z_vfs->vfs_flag & VFS_RDONLY))
1812 txg_wait_synced(dmu_objset_pool(zfsvfs->z_os), 0);
1813 (void) dmu_objset_evict_dbufs(zfsvfs->z_os);
1820 zfs_umount(vfs_t *vfsp, int fflag, cred_t *cr)
1822 zfsvfs_t *zfsvfs = vfsp->vfs_data;
1826 ret = secpolicy_fs_unmount(cr, vfsp);
1828 if (dsl_deleg_access((char *)refstr_value(vfsp->vfs_resource),
1829 ZFS_DELEG_PERM_MOUNT, cr))
1834 * We purge the parent filesystem's vfsp as the parent filesystem
1835 * and all of its snapshots have their vnode's v_vfsp set to the
1836 * parent's filesystem's vfsp. Note, 'z_parent' is self
1837 * referential for non-snapshots.
1839 (void) dnlc_purge_vfsp(zfsvfs->z_parent->z_vfs, 0);
1842 * Unmount any snapshots mounted under .zfs before unmounting the
1845 if (zfsvfs->z_ctldir != NULL &&
1846 (ret = zfsctl_umount_snapshots(vfsp, fflag, cr)) != 0) {
1850 if (!(fflag & MS_FORCE)) {
1852 * Check the number of active vnodes in the file system.
1853 * Our count is maintained in the vfs structure, but the
1854 * number is off by 1 to indicate a hold on the vfs
1857 * The '.zfs' directory maintains a reference of its
1858 * own, and any active references underneath are
1859 * reflected in the vnode count.
1861 if (zfsvfs->z_ctldir == NULL) {
1862 if (vfsp->vfs_count > 1)
1865 if (vfsp->vfs_count > 2 ||
1866 zfsvfs->z_ctldir->v_count > 1)
1871 vfsp->vfs_flag |= VFS_UNMOUNTED;
1873 VERIFY(zfsvfs_teardown(zfsvfs, B_TRUE) == 0);
1877 * z_os will be NULL if there was an error in
1878 * attempting to reopen zfsvfs.
1882 * Unset the objset user_ptr.
1884 mutex_enter(&os->os_user_ptr_lock);
1885 dmu_objset_set_user(os, NULL);
1886 mutex_exit(&os->os_user_ptr_lock);
1889 * Finally release the objset
1891 dmu_objset_disown(os, zfsvfs);
1895 * We can now safely destroy the '.zfs' directory node.
1897 if (zfsvfs->z_ctldir != NULL)
1898 zfsctl_destroy(zfsvfs);
1904 zfs_vget(vfs_t *vfsp, vnode_t **vpp, fid_t *fidp)
1906 zfsvfs_t *zfsvfs = vfsp->vfs_data;
1908 uint64_t object = 0;
1909 uint64_t fid_gen = 0;
1918 if (fidp->fid_len == LONG_FID_LEN) {
1919 zfid_long_t *zlfid = (zfid_long_t *)fidp;
1920 uint64_t objsetid = 0;
1921 uint64_t setgen = 0;
1923 for (i = 0; i < sizeof (zlfid->zf_setid); i++)
1924 objsetid |= ((uint64_t)zlfid->zf_setid[i]) << (8 * i);
1926 for (i = 0; i < sizeof (zlfid->zf_setgen); i++)
1927 setgen |= ((uint64_t)zlfid->zf_setgen[i]) << (8 * i);
1931 err = zfsctl_lookup_objset(vfsp, objsetid, &zfsvfs);
1937 if (fidp->fid_len == SHORT_FID_LEN || fidp->fid_len == LONG_FID_LEN) {
1938 zfid_short_t *zfid = (zfid_short_t *)fidp;
1940 for (i = 0; i < sizeof (zfid->zf_object); i++)
1941 object |= ((uint64_t)zfid->zf_object[i]) << (8 * i);
1943 for (i = 0; i < sizeof (zfid->zf_gen); i++)
1944 fid_gen |= ((uint64_t)zfid->zf_gen[i]) << (8 * i);
1950 /* A zero fid_gen means we are in the .zfs control directories */
1952 (object == ZFSCTL_INO_ROOT || object == ZFSCTL_INO_SNAPDIR)) {
1953 *vpp = zfsvfs->z_ctldir;
1954 ASSERT(*vpp != NULL);
1955 if (object == ZFSCTL_INO_SNAPDIR) {
1956 VERIFY(zfsctl_root_lookup(*vpp, "snapshot", vpp, NULL,
1957 0, NULL, NULL, NULL, NULL, NULL) == 0);
1965 gen_mask = -1ULL >> (64 - 8 * i);
1967 dprintf("getting %llu [%u mask %llx]\n", object, fid_gen, gen_mask);
1968 if (err = zfs_zget(zfsvfs, object, &zp)) {
1972 (void) sa_lookup(zp->z_sa_hdl, SA_ZPL_GEN(zfsvfs), &zp_gen,
1974 zp_gen = zp_gen & gen_mask;
1977 if (zp->z_unlinked || zp_gen != fid_gen) {
1978 dprintf("znode gen (%u) != fid gen (%u)\n", zp_gen, fid_gen);
1990 * Block out VOPs and close zfsvfs_t::z_os
1992 * Note, if successful, then we return with the 'z_teardown_lock' and
1993 * 'z_teardown_inactive_lock' write held.
1996 zfs_suspend_fs(zfsvfs_t *zfsvfs)
2000 if ((error = zfsvfs_teardown(zfsvfs, B_FALSE)) != 0)
2002 dmu_objset_disown(zfsvfs->z_os, zfsvfs);
2008 * Reopen zfsvfs_t::z_os and release VOPs.
2011 zfs_resume_fs(zfsvfs_t *zfsvfs, const char *osname)
2015 ASSERT(RRW_WRITE_HELD(&zfsvfs->z_teardown_lock));
2016 ASSERT(RW_WRITE_HELD(&zfsvfs->z_teardown_inactive_lock));
2018 err = dmu_objset_own(osname, DMU_OST_ZFS, B_FALSE, zfsvfs,
2021 zfsvfs->z_os = NULL;
2024 uint64_t sa_obj = 0;
2026 err2 = zap_lookup(zfsvfs->z_os, MASTER_NODE_OBJ,
2027 ZFS_SA_ATTRS, 8, 1, &sa_obj);
2029 if ((err || err2) && zfsvfs->z_version >= ZPL_VERSION_SA)
2033 if ((err = sa_setup(zfsvfs->z_os, sa_obj,
2034 zfs_attr_table, ZPL_END, &zfsvfs->z_attr_table)) != 0)
2037 VERIFY(zfsvfs_setup(zfsvfs, B_FALSE) == 0);
2040 * Attempt to re-establish all the active znodes with
2041 * their dbufs. If a zfs_rezget() fails, then we'll let
2042 * any potential callers discover that via ZFS_ENTER_VERIFY_VP
2043 * when they try to use their znode.
2045 mutex_enter(&zfsvfs->z_znodes_lock);
2046 for (zp = list_head(&zfsvfs->z_all_znodes); zp;
2047 zp = list_next(&zfsvfs->z_all_znodes, zp)) {
2048 (void) zfs_rezget(zp);
2050 mutex_exit(&zfsvfs->z_znodes_lock);
2055 /* release the VOPs */
2056 rw_exit(&zfsvfs->z_teardown_inactive_lock);
2057 rrw_exit(&zfsvfs->z_teardown_lock, FTAG);
2061 * Since we couldn't reopen zfsvfs::z_os, force
2062 * unmount this file system.
2064 if (vn_vfswlock(zfsvfs->z_vfs->vfs_vnodecovered) == 0)
2065 (void) dounmount(zfsvfs->z_vfs, MS_FORCE, CRED());
2071 zfs_freevfs(vfs_t *vfsp)
2073 zfsvfs_t *zfsvfs = vfsp->vfs_data;
2076 * If this is a snapshot, we have an extra VFS_HOLD on our parent
2077 * from zfs_mount(). Release it here. If we came through
2078 * zfs_mountroot() instead, we didn't grab an extra hold, so
2079 * skip the VFS_RELE for rootvfs.
2081 if (zfsvfs->z_issnap && (vfsp != rootvfs))
2082 VFS_RELE(zfsvfs->z_parent->z_vfs);
2084 zfsvfs_free(zfsvfs);
2086 atomic_add_32(&zfs_active_fs_count, -1);
2090 * VFS_INIT() initialization. Note that there is no VFS_FINI(),
2091 * so we can't safely do any non-idempotent initialization here.
2092 * Leave that to zfs_init() and zfs_fini(), which are called
2093 * from the module's _init() and _fini() entry points.
2097 zfs_vfsinit(int fstype, char *name)
2104 * Setup vfsops and vnodeops tables.
2106 error = vfs_setfsops(fstype, zfs_vfsops_template, &zfs_vfsops);
2108 cmn_err(CE_WARN, "zfs: bad vfs ops template");
2111 error = zfs_create_op_tables();
2113 zfs_remove_op_tables();
2114 cmn_err(CE_WARN, "zfs: bad vnode ops template");
2115 (void) vfs_freevfsops_by_type(zfsfstype);
2119 mutex_init(&zfs_dev_mtx, NULL, MUTEX_DEFAULT, NULL);
2122 * Unique major number for all zfs mounts.
2123 * If we run out of 32-bit minors, we'll getudev() another major.
2125 zfs_major = ddi_name_to_major(ZFS_DRIVER);
2126 zfs_minor = ZFS_MIN_MINOR;
2135 * Initialize .zfs directory structures
2140 * Initialize znode cache, vnode ops, etc...
2144 dmu_objset_register_type(DMU_OST_ZFS, zfs_space_delta_cb);
2157 return (zfs_active_fs_count != 0);
2161 zfs_set_version(zfsvfs_t *zfsvfs, uint64_t newvers)
2164 objset_t *os = zfsvfs->z_os;
2167 if (newvers < ZPL_VERSION_INITIAL || newvers > ZPL_VERSION)
2170 if (newvers < zfsvfs->z_version)
2173 if (zfs_spa_version_map(newvers) >
2174 spa_version(dmu_objset_spa(zfsvfs->z_os)))
2177 tx = dmu_tx_create(os);
2178 dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, B_FALSE, ZPL_VERSION_STR);
2179 if (newvers >= ZPL_VERSION_SA && !zfsvfs->z_use_sa) {
2180 dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, B_TRUE,
2182 dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, FALSE, NULL);
2184 error = dmu_tx_assign(tx, TXG_WAIT);
2190 error = zap_update(os, MASTER_NODE_OBJ, ZPL_VERSION_STR,
2191 8, 1, &newvers, tx);
2198 if (newvers >= ZPL_VERSION_SA && !zfsvfs->z_use_sa) {
2201 ASSERT3U(spa_version(dmu_objset_spa(zfsvfs->z_os)), >=,
2203 sa_obj = zap_create(os, DMU_OT_SA_MASTER_NODE,
2204 DMU_OT_NONE, 0, tx);
2206 error = zap_add(os, MASTER_NODE_OBJ,
2207 ZFS_SA_ATTRS, 8, 1, &sa_obj, tx);
2208 ASSERT3U(error, ==, 0);
2210 VERIFY(0 == sa_set_sa_object(os, sa_obj));
2211 sa_register_update_callback(os, zfs_sa_upgrade);
2214 spa_history_log_internal(LOG_DS_UPGRADE,
2215 dmu_objset_spa(os), tx, "oldver=%llu newver=%llu dataset = %llu",
2216 zfsvfs->z_version, newvers, dmu_objset_id(os));
2220 zfsvfs->z_version = newvers;
2222 if (zfsvfs->z_version >= ZPL_VERSION_FUID)
2223 zfs_set_fuid_feature(zfsvfs);
2229 * Read a property stored within the master node.
2232 zfs_get_zplprop(objset_t *os, zfs_prop_t prop, uint64_t *value)
2238 * Look up the file system's value for the property. For the
2239 * version property, we look up a slightly different string.
2241 if (prop == ZFS_PROP_VERSION)
2242 pname = ZPL_VERSION_STR;
2244 pname = zfs_prop_to_name(prop);
2247 error = zap_lookup(os, MASTER_NODE_OBJ, pname, 8, 1, value);
2249 if (error == ENOENT) {
2250 /* No value set, use the default value */
2252 case ZFS_PROP_VERSION:
2253 *value = ZPL_VERSION;
2255 case ZFS_PROP_NORMALIZE:
2256 case ZFS_PROP_UTF8ONLY:
2260 *value = ZFS_CASE_SENSITIVE;
2270 static vfsdef_t vfw = {
2274 VSW_HASPROTO|VSW_CANRWRO|VSW_CANREMOUNT|VSW_VOLATILEDEV|VSW_STATS|
2279 struct modlfs zfs_modlfs = {
2280 &mod_fsops, "ZFS filesystem version " SPA_VERSION_STRING, &vfw