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"
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_mountroot(vfs_t
*vfsp
, enum whymountroot
);
78 static void zfs_freevfs(vfs_t
*vfsp
);
81 * We need to keep a count of active fs's.
82 * This is necessary to prevent our module
83 * from being unloaded after a umount -f
85 static uint32_t zfs_active_fs_count
= 0;
87 static char *noatime_cancel
[] = { MNTOPT_ATIME
, NULL
};
88 static char *atime_cancel
[] = { MNTOPT_NOATIME
, NULL
};
89 static char *noxattr_cancel
[] = { MNTOPT_XATTR
, NULL
};
90 static char *xattr_cancel
[] = { MNTOPT_NOXATTR
, NULL
};
93 * MO_DEFAULT is not used since the default value is determined
94 * by the equivalent property.
96 static mntopt_t mntopts
[] = {
97 { MNTOPT_NOXATTR
, noxattr_cancel
, NULL
, 0, NULL
},
98 { MNTOPT_XATTR
, xattr_cancel
, NULL
, 0, NULL
},
99 { MNTOPT_NOATIME
, noatime_cancel
, NULL
, 0, NULL
},
100 { MNTOPT_ATIME
, atime_cancel
, NULL
, 0, NULL
}
103 static mntopts_t zfs_mntopts
= {
104 sizeof (mntopts
) / sizeof (mntopt_t
),
110 zfs_sync(vfs_t
*vfsp
, short flag
, cred_t
*cr
)
113 * Data integrity is job one. We don't want a compromised kernel
114 * writing to the storage pool, so we never sync during panic.
120 * SYNC_ATTR is used by fsflush() to force old filesystems like UFS
121 * to sync metadata, which they would otherwise cache indefinitely.
122 * Semantically, the only requirement is that the sync be initiated.
123 * The DMU syncs out txgs frequently, so there's nothing to do.
125 if (flag
& SYNC_ATTR
)
130 * Sync a specific filesystem.
132 zfsvfs_t
*zfsvfs
= vfsp
->vfs_data
;
136 dp
= dmu_objset_pool(zfsvfs
->z_os
);
139 * If the system is shutting down, then skip any
140 * filesystems which may exist on a suspended pool.
142 if (sys_shutdown
&& spa_suspended(dp
->dp_spa
)) {
147 if (zfsvfs
->z_log
!= NULL
)
148 zil_commit(zfsvfs
->z_log
, 0);
153 * Sync all ZFS filesystems. This is what happens when you
154 * run sync(1M). Unlike other filesystems, ZFS honors the
155 * request by waiting for all pools to commit all dirty data.
162 EXPORT_SYMBOL(zfs_sync
);
165 zfs_create_unique_device(dev_t
*dev
)
170 ASSERT3U(zfs_minor
, <=, MAXMIN32
);
171 minor_t start
= zfs_minor
;
173 mutex_enter(&zfs_dev_mtx
);
174 if (zfs_minor
>= MAXMIN32
) {
176 * If we're still using the real major
177 * keep out of /dev/zfs and /dev/zvol minor
178 * number space. If we're using a getudev()'ed
179 * major number, we can use all of its minors.
181 if (zfs_major
== ddi_name_to_major(ZFS_DRIVER
))
182 zfs_minor
= ZFS_MIN_MINOR
;
188 *dev
= makedevice(zfs_major
, zfs_minor
);
189 mutex_exit(&zfs_dev_mtx
);
190 } while (vfs_devismounted(*dev
) && zfs_minor
!= start
);
191 if (zfs_minor
== start
) {
193 * We are using all ~262,000 minor numbers for the
194 * current major number. Create a new major number.
196 if ((new_major
= getudev()) == (major_t
)-1) {
198 "zfs_mount: Can't get unique major "
202 mutex_enter(&zfs_dev_mtx
);
203 zfs_major
= new_major
;
206 mutex_exit(&zfs_dev_mtx
);
210 /* CONSTANTCONDITION */
217 atime_changed_cb(void *arg
, uint64_t newval
)
219 zfsvfs_t
*zfsvfs
= arg
;
221 if (newval
== TRUE
) {
222 zfsvfs
->z_atime
= TRUE
;
223 vfs_clearmntopt(zfsvfs
->z_vfs
, MNTOPT_NOATIME
);
224 vfs_setmntopt(zfsvfs
->z_vfs
, MNTOPT_ATIME
, NULL
, 0);
226 zfsvfs
->z_atime
= FALSE
;
227 vfs_clearmntopt(zfsvfs
->z_vfs
, MNTOPT_ATIME
);
228 vfs_setmntopt(zfsvfs
->z_vfs
, MNTOPT_NOATIME
, NULL
, 0);
233 xattr_changed_cb(void *arg
, uint64_t newval
)
235 zfsvfs_t
*zfsvfs
= arg
;
237 if (newval
== TRUE
) {
238 /* XXX locking on vfs_flag? */
239 zfsvfs
->z_vfs
->vfs_flag
|= VFS_XATTR
;
240 vfs_clearmntopt(zfsvfs
->z_vfs
, MNTOPT_NOXATTR
);
241 vfs_setmntopt(zfsvfs
->z_vfs
, MNTOPT_XATTR
, NULL
, 0);
243 /* XXX locking on vfs_flag? */
244 zfsvfs
->z_vfs
->vfs_flag
&= ~VFS_XATTR
;
245 vfs_clearmntopt(zfsvfs
->z_vfs
, MNTOPT_XATTR
);
246 vfs_setmntopt(zfsvfs
->z_vfs
, MNTOPT_NOXATTR
, NULL
, 0);
251 blksz_changed_cb(void *arg
, uint64_t newval
)
253 zfsvfs_t
*zfsvfs
= arg
;
255 if (newval
< SPA_MINBLOCKSIZE
||
256 newval
> SPA_MAXBLOCKSIZE
|| !ISP2(newval
))
257 newval
= SPA_MAXBLOCKSIZE
;
259 zfsvfs
->z_max_blksz
= newval
;
260 zfsvfs
->z_vfs
->vfs_bsize
= newval
;
264 readonly_changed_cb(void *arg
, uint64_t newval
)
266 zfsvfs_t
*zfsvfs
= arg
;
269 /* XXX locking on vfs_flag? */
270 zfsvfs
->z_vfs
->vfs_flag
|= VFS_RDONLY
;
271 vfs_clearmntopt(zfsvfs
->z_vfs
, MNTOPT_RW
);
272 vfs_setmntopt(zfsvfs
->z_vfs
, MNTOPT_RO
, NULL
, 0);
274 /* XXX locking on vfs_flag? */
275 zfsvfs
->z_vfs
->vfs_flag
&= ~VFS_RDONLY
;
276 vfs_clearmntopt(zfsvfs
->z_vfs
, MNTOPT_RO
);
277 vfs_setmntopt(zfsvfs
->z_vfs
, MNTOPT_RW
, NULL
, 0);
282 devices_changed_cb(void *arg
, uint64_t newval
)
284 zfsvfs_t
*zfsvfs
= arg
;
286 if (newval
== FALSE
) {
287 zfsvfs
->z_vfs
->vfs_flag
|= VFS_NODEVICES
;
288 vfs_clearmntopt(zfsvfs
->z_vfs
, MNTOPT_DEVICES
);
289 vfs_setmntopt(zfsvfs
->z_vfs
, MNTOPT_NODEVICES
, NULL
, 0);
291 zfsvfs
->z_vfs
->vfs_flag
&= ~VFS_NODEVICES
;
292 vfs_clearmntopt(zfsvfs
->z_vfs
, MNTOPT_NODEVICES
);
293 vfs_setmntopt(zfsvfs
->z_vfs
, MNTOPT_DEVICES
, NULL
, 0);
298 setuid_changed_cb(void *arg
, uint64_t newval
)
300 zfsvfs_t
*zfsvfs
= arg
;
302 if (newval
== FALSE
) {
303 zfsvfs
->z_vfs
->vfs_flag
|= VFS_NOSETUID
;
304 vfs_clearmntopt(zfsvfs
->z_vfs
, MNTOPT_SETUID
);
305 vfs_setmntopt(zfsvfs
->z_vfs
, MNTOPT_NOSETUID
, NULL
, 0);
307 zfsvfs
->z_vfs
->vfs_flag
&= ~VFS_NOSETUID
;
308 vfs_clearmntopt(zfsvfs
->z_vfs
, MNTOPT_NOSETUID
);
309 vfs_setmntopt(zfsvfs
->z_vfs
, MNTOPT_SETUID
, NULL
, 0);
314 exec_changed_cb(void *arg
, uint64_t newval
)
316 zfsvfs_t
*zfsvfs
= arg
;
318 if (newval
== FALSE
) {
319 zfsvfs
->z_vfs
->vfs_flag
|= VFS_NOEXEC
;
320 vfs_clearmntopt(zfsvfs
->z_vfs
, MNTOPT_EXEC
);
321 vfs_setmntopt(zfsvfs
->z_vfs
, MNTOPT_NOEXEC
, NULL
, 0);
323 zfsvfs
->z_vfs
->vfs_flag
&= ~VFS_NOEXEC
;
324 vfs_clearmntopt(zfsvfs
->z_vfs
, MNTOPT_NOEXEC
);
325 vfs_setmntopt(zfsvfs
->z_vfs
, MNTOPT_EXEC
, NULL
, 0);
330 * The nbmand mount option can be changed at mount time.
331 * We can't allow it to be toggled on live file systems or incorrect
332 * behavior may be seen from cifs clients
334 * This property isn't registered via dsl_prop_register(), but this callback
335 * will be called when a file system is first mounted
338 nbmand_changed_cb(void *arg
, uint64_t newval
)
340 zfsvfs_t
*zfsvfs
= arg
;
341 if (newval
== FALSE
) {
342 vfs_clearmntopt(zfsvfs
->z_vfs
, MNTOPT_NBMAND
);
343 vfs_setmntopt(zfsvfs
->z_vfs
, MNTOPT_NONBMAND
, NULL
, 0);
345 vfs_clearmntopt(zfsvfs
->z_vfs
, MNTOPT_NONBMAND
);
346 vfs_setmntopt(zfsvfs
->z_vfs
, MNTOPT_NBMAND
, NULL
, 0);
351 snapdir_changed_cb(void *arg
, uint64_t newval
)
353 zfsvfs_t
*zfsvfs
= arg
;
355 zfsvfs
->z_show_ctldir
= newval
;
359 vscan_changed_cb(void *arg
, uint64_t newval
)
361 zfsvfs_t
*zfsvfs
= arg
;
363 zfsvfs
->z_vscan
= newval
;
367 acl_inherit_changed_cb(void *arg
, uint64_t newval
)
369 zfsvfs_t
*zfsvfs
= arg
;
371 zfsvfs
->z_acl_inherit
= newval
;
375 zfs_register_callbacks(vfs_t
*vfsp
)
377 struct dsl_dataset
*ds
= NULL
;
379 zfsvfs_t
*zfsvfs
= NULL
;
381 int readonly
, do_readonly
= B_FALSE
;
382 int setuid
, do_setuid
= B_FALSE
;
383 int exec
, do_exec
= B_FALSE
;
384 int devices
, do_devices
= B_FALSE
;
385 int xattr
, do_xattr
= B_FALSE
;
386 int atime
, do_atime
= B_FALSE
;
390 zfsvfs
= vfsp
->vfs_data
;
395 * The act of registering our callbacks will destroy any mount
396 * options we may have. In order to enable temporary overrides
397 * of mount options, we stash away the current values and
398 * restore them after we register the callbacks.
400 if (vfs_optionisset(vfsp
, MNTOPT_RO
, NULL
) ||
401 !spa_writeable(dmu_objset_spa(os
))) {
403 do_readonly
= B_TRUE
;
404 } else if (vfs_optionisset(vfsp
, MNTOPT_RW
, NULL
)) {
406 do_readonly
= B_TRUE
;
408 if (vfs_optionisset(vfsp
, MNTOPT_NOSUID
, NULL
)) {
414 if (vfs_optionisset(vfsp
, MNTOPT_NODEVICES
, NULL
)) {
417 } else if (vfs_optionisset(vfsp
, MNTOPT_DEVICES
, NULL
)) {
422 if (vfs_optionisset(vfsp
, MNTOPT_NOSETUID
, NULL
)) {
425 } else if (vfs_optionisset(vfsp
, MNTOPT_SETUID
, NULL
)) {
430 if (vfs_optionisset(vfsp
, MNTOPT_NOEXEC
, NULL
)) {
433 } else if (vfs_optionisset(vfsp
, MNTOPT_EXEC
, NULL
)) {
437 if (vfs_optionisset(vfsp
, MNTOPT_NOXATTR
, NULL
)) {
440 } else if (vfs_optionisset(vfsp
, MNTOPT_XATTR
, NULL
)) {
444 if (vfs_optionisset(vfsp
, MNTOPT_NOATIME
, NULL
)) {
447 } else if (vfs_optionisset(vfsp
, MNTOPT_ATIME
, NULL
)) {
453 * nbmand is a special property. It can only be changed at
456 * This is weird, but it is documented to only be changeable
459 if (vfs_optionisset(vfsp
, MNTOPT_NONBMAND
, NULL
)) {
461 } else if (vfs_optionisset(vfsp
, MNTOPT_NBMAND
, NULL
)) {
464 char osname
[MAXNAMELEN
];
466 dmu_objset_name(os
, osname
);
467 if ((error
= dsl_prop_get_integer(osname
, "nbmand", &nbmand
,
474 * Register property callbacks.
476 * It would probably be fine to just check for i/o error from
477 * the first prop_register(), but I guess I like to go
480 ds
= dmu_objset_ds(os
);
481 error
= dsl_prop_register(ds
, "atime", atime_changed_cb
, zfsvfs
);
482 error
= error
? error
: dsl_prop_register(ds
,
483 "xattr", xattr_changed_cb
, zfsvfs
);
484 error
= error
? error
: dsl_prop_register(ds
,
485 "recordsize", blksz_changed_cb
, zfsvfs
);
486 error
= error
? error
: dsl_prop_register(ds
,
487 "readonly", readonly_changed_cb
, zfsvfs
);
488 error
= error
? error
: dsl_prop_register(ds
,
489 "devices", devices_changed_cb
, zfsvfs
);
490 error
= error
? error
: dsl_prop_register(ds
,
491 "setuid", setuid_changed_cb
, zfsvfs
);
492 error
= error
? error
: dsl_prop_register(ds
,
493 "exec", exec_changed_cb
, zfsvfs
);
494 error
= error
? error
: dsl_prop_register(ds
,
495 "snapdir", snapdir_changed_cb
, zfsvfs
);
496 error
= error
? error
: dsl_prop_register(ds
,
497 "aclinherit", acl_inherit_changed_cb
, zfsvfs
);
498 error
= error
? error
: dsl_prop_register(ds
,
499 "vscan", vscan_changed_cb
, zfsvfs
);
504 * Invoke our callbacks to restore temporary mount options.
507 readonly_changed_cb(zfsvfs
, readonly
);
509 setuid_changed_cb(zfsvfs
, setuid
);
511 exec_changed_cb(zfsvfs
, exec
);
513 devices_changed_cb(zfsvfs
, devices
);
515 xattr_changed_cb(zfsvfs
, xattr
);
517 atime_changed_cb(zfsvfs
, atime
);
519 nbmand_changed_cb(zfsvfs
, nbmand
);
525 * We may attempt to unregister some callbacks that are not
526 * registered, but this is OK; it will simply return ENOMSG,
527 * which we will ignore.
529 (void) dsl_prop_unregister(ds
, "atime", atime_changed_cb
, zfsvfs
);
530 (void) dsl_prop_unregister(ds
, "xattr", xattr_changed_cb
, zfsvfs
);
531 (void) dsl_prop_unregister(ds
, "recordsize", blksz_changed_cb
, zfsvfs
);
532 (void) dsl_prop_unregister(ds
, "readonly", readonly_changed_cb
, zfsvfs
);
533 (void) dsl_prop_unregister(ds
, "devices", devices_changed_cb
, zfsvfs
);
534 (void) dsl_prop_unregister(ds
, "setuid", setuid_changed_cb
, zfsvfs
);
535 (void) dsl_prop_unregister(ds
, "exec", exec_changed_cb
, zfsvfs
);
536 (void) dsl_prop_unregister(ds
, "snapdir", snapdir_changed_cb
, zfsvfs
);
537 (void) dsl_prop_unregister(ds
, "aclinherit", acl_inherit_changed_cb
,
539 (void) dsl_prop_unregister(ds
, "vscan", vscan_changed_cb
, zfsvfs
);
543 EXPORT_SYMBOL(zfs_register_callbacks
);
544 #endif /* HAVE_ZPL */
547 zfs_space_delta_cb(dmu_object_type_t bonustype
, void *data
,
548 uint64_t *userp
, uint64_t *groupp
)
550 znode_phys_t
*znp
= data
;
554 * Is it a valid type of object to track?
556 if (bonustype
!= DMU_OT_ZNODE
&& bonustype
!= DMU_OT_SA
)
560 * If we have a NULL data pointer
561 * then assume the id's aren't changing and
562 * return EEXIST to the dmu to let it know to
568 if (bonustype
== DMU_OT_ZNODE
) {
569 *userp
= znp
->zp_uid
;
570 *groupp
= znp
->zp_gid
;
574 ASSERT(bonustype
== DMU_OT_SA
);
575 hdrsize
= sa_hdrsize(data
);
578 *userp
= *((uint64_t *)((uintptr_t)data
+ hdrsize
+
580 *groupp
= *((uint64_t *)((uintptr_t)data
+ hdrsize
+
584 * This should only happen for newly created
585 * files that haven't had the znode data filled
597 fuidstr_to_sid(zfsvfs_t
*zfsvfs
, const char *fuidstr
,
598 char *domainbuf
, int buflen
, uid_t
*ridp
)
603 fuid
= strtonum(fuidstr
, NULL
);
605 domain
= zfs_fuid_find_by_idx(zfsvfs
, FUID_INDEX(fuid
));
607 (void) strlcpy(domainbuf
, domain
, buflen
);
610 *ridp
= FUID_RID(fuid
);
614 zfs_userquota_prop_to_obj(zfsvfs_t
*zfsvfs
, zfs_userquota_prop_t type
)
617 case ZFS_PROP_USERUSED
:
618 return (DMU_USERUSED_OBJECT
);
619 case ZFS_PROP_GROUPUSED
:
620 return (DMU_GROUPUSED_OBJECT
);
621 case ZFS_PROP_USERQUOTA
:
622 return (zfsvfs
->z_userquota_obj
);
623 case ZFS_PROP_GROUPQUOTA
:
624 return (zfsvfs
->z_groupquota_obj
);
632 zfs_userspace_many(zfsvfs_t
*zfsvfs
, zfs_userquota_prop_t type
,
633 uint64_t *cookiep
, void *vbuf
, uint64_t *bufsizep
)
638 zfs_useracct_t
*buf
= vbuf
;
641 if (!dmu_objset_userspace_present(zfsvfs
->z_os
))
644 obj
= zfs_userquota_prop_to_obj(zfsvfs
, type
);
650 for (zap_cursor_init_serialized(&zc
, zfsvfs
->z_os
, obj
, *cookiep
);
651 (error
= zap_cursor_retrieve(&zc
, &za
)) == 0;
652 zap_cursor_advance(&zc
)) {
653 if ((uintptr_t)buf
- (uintptr_t)vbuf
+ sizeof (zfs_useracct_t
) >
657 fuidstr_to_sid(zfsvfs
, za
.za_name
,
658 buf
->zu_domain
, sizeof (buf
->zu_domain
), &buf
->zu_rid
);
660 buf
->zu_space
= za
.za_first_integer
;
666 ASSERT3U((uintptr_t)buf
- (uintptr_t)vbuf
, <=, *bufsizep
);
667 *bufsizep
= (uintptr_t)buf
- (uintptr_t)vbuf
;
668 *cookiep
= zap_cursor_serialize(&zc
);
669 zap_cursor_fini(&zc
);
672 EXPORT_SYMBOL(zfs_userspace_many
);
675 * buf must be big enough (eg, 32 bytes)
678 id_to_fuidstr(zfsvfs_t
*zfsvfs
, const char *domain
, uid_t rid
,
679 char *buf
, boolean_t addok
)
684 if (domain
&& domain
[0]) {
685 domainid
= zfs_fuid_find_by_domain(zfsvfs
, domain
, NULL
, addok
);
689 fuid
= FUID_ENCODE(domainid
, rid
);
690 (void) sprintf(buf
, "%llx", (longlong_t
)fuid
);
695 zfs_userspace_one(zfsvfs_t
*zfsvfs
, zfs_userquota_prop_t type
,
696 const char *domain
, uint64_t rid
, uint64_t *valp
)
704 if (!dmu_objset_userspace_present(zfsvfs
->z_os
))
707 obj
= zfs_userquota_prop_to_obj(zfsvfs
, type
);
711 err
= id_to_fuidstr(zfsvfs
, domain
, rid
, buf
, B_FALSE
);
715 err
= zap_lookup(zfsvfs
->z_os
, obj
, buf
, 8, 1, valp
);
720 EXPORT_SYMBOL(zfs_userspace_one
);
723 zfs_set_userquota(zfsvfs_t
*zfsvfs
, zfs_userquota_prop_t type
,
724 const char *domain
, uint64_t rid
, uint64_t quota
)
730 boolean_t fuid_dirtied
;
732 if (type
!= ZFS_PROP_USERQUOTA
&& type
!= ZFS_PROP_GROUPQUOTA
)
735 if (zfsvfs
->z_version
< ZPL_VERSION_USERSPACE
)
738 objp
= (type
== ZFS_PROP_USERQUOTA
) ? &zfsvfs
->z_userquota_obj
:
739 &zfsvfs
->z_groupquota_obj
;
741 err
= id_to_fuidstr(zfsvfs
, domain
, rid
, buf
, B_TRUE
);
744 fuid_dirtied
= zfsvfs
->z_fuid_dirty
;
746 tx
= dmu_tx_create(zfsvfs
->z_os
);
747 dmu_tx_hold_zap(tx
, *objp
? *objp
: DMU_NEW_OBJECT
, B_TRUE
, NULL
);
749 dmu_tx_hold_zap(tx
, MASTER_NODE_OBJ
, B_TRUE
,
750 zfs_userquota_prop_prefixes
[type
]);
753 zfs_fuid_txhold(zfsvfs
, tx
);
754 err
= dmu_tx_assign(tx
, TXG_WAIT
);
760 mutex_enter(&zfsvfs
->z_lock
);
762 *objp
= zap_create(zfsvfs
->z_os
, DMU_OT_USERGROUP_QUOTA
,
764 VERIFY(0 == zap_add(zfsvfs
->z_os
, MASTER_NODE_OBJ
,
765 zfs_userquota_prop_prefixes
[type
], 8, 1, objp
, tx
));
767 mutex_exit(&zfsvfs
->z_lock
);
770 err
= zap_remove(zfsvfs
->z_os
, *objp
, buf
, tx
);
774 err
= zap_update(zfsvfs
->z_os
, *objp
, buf
, 8, 1, "a
, tx
);
778 zfs_fuid_sync(zfsvfs
, tx
);
782 EXPORT_SYMBOL(zfs_set_userquota
);
785 zfs_fuid_overquota(zfsvfs_t
*zfsvfs
, boolean_t isgroup
, uint64_t fuid
)
788 uint64_t used
, quota
, usedobj
, quotaobj
;
791 usedobj
= isgroup
? DMU_GROUPUSED_OBJECT
: DMU_USERUSED_OBJECT
;
792 quotaobj
= isgroup
? zfsvfs
->z_groupquota_obj
: zfsvfs
->z_userquota_obj
;
794 if (quotaobj
== 0 || zfsvfs
->z_replay
)
797 (void) sprintf(buf
, "%llx", (longlong_t
)fuid
);
798 err
= zap_lookup(zfsvfs
->z_os
, quotaobj
, buf
, 8, 1, "a
);
802 err
= zap_lookup(zfsvfs
->z_os
, usedobj
, buf
, 8, 1, &used
);
805 return (used
>= quota
);
807 EXPORT_SYMBOL(zfs_fuid_overquota
);
810 zfs_owner_overquota(zfsvfs_t
*zfsvfs
, znode_t
*zp
, boolean_t isgroup
)
815 quotaobj
= isgroup
? zfsvfs
->z_groupquota_obj
: zfsvfs
->z_userquota_obj
;
817 fuid
= isgroup
? zp
->z_gid
: zp
->z_uid
;
819 if (quotaobj
== 0 || zfsvfs
->z_replay
)
822 return (zfs_fuid_overquota(zfsvfs
, isgroup
, fuid
));
824 EXPORT_SYMBOL(zfs_owner_overquota
);
827 zfsvfs_create(const char *osname
, zfsvfs_t
**zfvp
)
835 zfsvfs
= kmem_zalloc(sizeof (zfsvfs_t
), KM_SLEEP
);
838 * We claim to always be readonly so we can open snapshots;
839 * other ZPL code will prevent us from writing to snapshots.
841 error
= dmu_objset_own(osname
, DMU_OST_ZFS
, B_TRUE
, zfsvfs
, &os
);
843 kmem_free(zfsvfs
, sizeof (zfsvfs_t
));
848 * Initialize the zfs-specific filesystem structure.
849 * Should probably make this a kmem cache, shuffle fields,
850 * and just bzero up to z_hold_mtx[].
852 zfsvfs
->z_vfs
= NULL
;
853 zfsvfs
->z_parent
= zfsvfs
;
854 zfsvfs
->z_max_blksz
= SPA_MAXBLOCKSIZE
;
855 zfsvfs
->z_show_ctldir
= ZFS_SNAPDIR_VISIBLE
;
858 error
= zfs_get_zplprop(os
, ZFS_PROP_VERSION
, &zfsvfs
->z_version
);
861 } else if (zfsvfs
->z_version
>
862 zfs_zpl_version_map(spa_version(dmu_objset_spa(os
)))) {
863 (void) printk("Can't mount a version %lld file system "
864 "on a version %lld pool\n. Pool must be upgraded to mount "
865 "this file system.", (u_longlong_t
)zfsvfs
->z_version
,
866 (u_longlong_t
)spa_version(dmu_objset_spa(os
)));
870 if ((error
= zfs_get_zplprop(os
, ZFS_PROP_NORMALIZE
, &zval
)) != 0)
872 zfsvfs
->z_norm
= (int)zval
;
874 if ((error
= zfs_get_zplprop(os
, ZFS_PROP_UTF8ONLY
, &zval
)) != 0)
876 zfsvfs
->z_utf8
= (zval
!= 0);
878 if ((error
= zfs_get_zplprop(os
, ZFS_PROP_CASE
, &zval
)) != 0)
880 zfsvfs
->z_case
= (uint_t
)zval
;
883 * Fold case on file systems that are always or sometimes case
886 if (zfsvfs
->z_case
== ZFS_CASE_INSENSITIVE
||
887 zfsvfs
->z_case
== ZFS_CASE_MIXED
)
888 zfsvfs
->z_norm
|= U8_TEXTPREP_TOUPPER
;
890 zfsvfs
->z_use_fuids
= USE_FUIDS(zfsvfs
->z_version
, zfsvfs
->z_os
);
891 zfsvfs
->z_use_sa
= USE_SA(zfsvfs
->z_version
, zfsvfs
->z_os
);
893 if (zfsvfs
->z_use_sa
) {
894 /* should either have both of these objects or none */
895 error
= zap_lookup(os
, MASTER_NODE_OBJ
, ZFS_SA_ATTRS
, 8, 1,
901 * Pre SA versions file systems should never touch
902 * either the attribute registration or layout objects.
907 error
= sa_setup(os
, sa_obj
, zfs_attr_table
, ZPL_END
,
908 &zfsvfs
->z_attr_table
);
912 if (zfsvfs
->z_version
>= ZPL_VERSION_SA
)
913 sa_register_update_callback(os
, zfs_sa_upgrade
);
915 error
= zap_lookup(os
, MASTER_NODE_OBJ
, ZFS_ROOT_OBJ
, 8, 1,
919 ASSERT(zfsvfs
->z_root
!= 0);
921 error
= zap_lookup(os
, MASTER_NODE_OBJ
, ZFS_UNLINKED_SET
, 8, 1,
922 &zfsvfs
->z_unlinkedobj
);
926 error
= zap_lookup(os
, MASTER_NODE_OBJ
,
927 zfs_userquota_prop_prefixes
[ZFS_PROP_USERQUOTA
],
928 8, 1, &zfsvfs
->z_userquota_obj
);
929 if (error
&& error
!= ENOENT
)
932 error
= zap_lookup(os
, MASTER_NODE_OBJ
,
933 zfs_userquota_prop_prefixes
[ZFS_PROP_GROUPQUOTA
],
934 8, 1, &zfsvfs
->z_groupquota_obj
);
935 if (error
&& error
!= ENOENT
)
938 error
= zap_lookup(os
, MASTER_NODE_OBJ
, ZFS_FUID_TABLES
, 8, 1,
939 &zfsvfs
->z_fuid_obj
);
940 if (error
&& error
!= ENOENT
)
943 error
= zap_lookup(os
, MASTER_NODE_OBJ
, ZFS_SHARES_DIR
, 8, 1,
944 &zfsvfs
->z_shares_dir
);
945 if (error
&& error
!= ENOENT
)
948 mutex_init(&zfsvfs
->z_znodes_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
949 mutex_init(&zfsvfs
->z_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
950 list_create(&zfsvfs
->z_all_znodes
, sizeof (znode_t
),
951 offsetof(znode_t
, z_link_node
));
952 rrw_init(&zfsvfs
->z_teardown_lock
);
953 rw_init(&zfsvfs
->z_teardown_inactive_lock
, NULL
, RW_DEFAULT
, NULL
);
954 rw_init(&zfsvfs
->z_fuid_lock
, NULL
, RW_DEFAULT
, NULL
);
955 for (i
= 0; i
!= ZFS_OBJ_MTX_SZ
; i
++)
956 mutex_init(&zfsvfs
->z_hold_mtx
[i
], NULL
, MUTEX_DEFAULT
, NULL
);
962 dmu_objset_disown(os
, zfsvfs
);
964 kmem_free(zfsvfs
, sizeof (zfsvfs_t
));
969 zfsvfs_setup(zfsvfs_t
*zfsvfs
, boolean_t mounting
)
973 error
= zfs_register_callbacks(zfsvfs
->z_vfs
);
978 * Set the objset user_ptr to track its zfsvfs.
980 mutex_enter(&zfsvfs
->z_os
->os_user_ptr_lock
);
981 dmu_objset_set_user(zfsvfs
->z_os
, zfsvfs
);
982 mutex_exit(&zfsvfs
->z_os
->os_user_ptr_lock
);
984 zfsvfs
->z_log
= zil_open(zfsvfs
->z_os
, zfs_get_data
);
987 * If we are not mounting (ie: online recv), then we don't
988 * have to worry about replaying the log as we blocked all
989 * operations out since we closed the ZIL.
995 * During replay we remove the read only flag to
996 * allow replays to succeed.
998 readonly
= zfsvfs
->z_vfs
->vfs_flag
& VFS_RDONLY
;
1000 zfsvfs
->z_vfs
->vfs_flag
&= ~VFS_RDONLY
;
1002 zfs_unlinked_drain(zfsvfs
);
1005 * Parse and replay the intent log.
1007 * Because of ziltest, this must be done after
1008 * zfs_unlinked_drain(). (Further note: ziltest
1009 * doesn't use readonly mounts, where
1010 * zfs_unlinked_drain() isn't called.) This is because
1011 * ziltest causes spa_sync() to think it's committed,
1012 * but actually it is not, so the intent log contains
1013 * many txg's worth of changes.
1015 * In particular, if object N is in the unlinked set in
1016 * the last txg to actually sync, then it could be
1017 * actually freed in a later txg and then reallocated
1018 * in a yet later txg. This would write a "create
1019 * object N" record to the intent log. Normally, this
1020 * would be fine because the spa_sync() would have
1021 * written out the fact that object N is free, before
1022 * we could write the "create object N" intent log
1025 * But when we are in ziltest mode, we advance the "open
1026 * txg" without actually spa_sync()-ing the changes to
1027 * disk. So we would see that object N is still
1028 * allocated and in the unlinked set, and there is an
1029 * intent log record saying to allocate it.
1031 if (spa_writeable(dmu_objset_spa(zfsvfs
->z_os
))) {
1032 if (zil_replay_disable
) {
1033 zil_destroy(zfsvfs
->z_log
, B_FALSE
);
1035 zfsvfs
->z_replay
= B_TRUE
;
1036 zil_replay(zfsvfs
->z_os
, zfsvfs
,
1038 zfsvfs
->z_replay
= B_FALSE
;
1041 zfsvfs
->z_vfs
->vfs_flag
|= readonly
; /* restore readonly bit */
1048 zfsvfs_free(zfsvfs_t
*zfsvfs
)
1051 extern krwlock_t zfsvfs_lock
; /* in zfs_znode.c */
1054 * This is a barrier to prevent the filesystem from going away in
1055 * zfs_znode_move() until we can safely ensure that the filesystem is
1056 * not unmounted. We consider the filesystem valid before the barrier
1057 * and invalid after the barrier.
1059 rw_enter(&zfsvfs_lock
, RW_READER
);
1060 rw_exit(&zfsvfs_lock
);
1062 zfs_fuid_destroy(zfsvfs
);
1064 mutex_destroy(&zfsvfs
->z_znodes_lock
);
1065 mutex_destroy(&zfsvfs
->z_lock
);
1066 list_destroy(&zfsvfs
->z_all_znodes
);
1067 rrw_destroy(&zfsvfs
->z_teardown_lock
);
1068 rw_destroy(&zfsvfs
->z_teardown_inactive_lock
);
1069 rw_destroy(&zfsvfs
->z_fuid_lock
);
1070 for (i
= 0; i
!= ZFS_OBJ_MTX_SZ
; i
++)
1071 mutex_destroy(&zfsvfs
->z_hold_mtx
[i
]);
1072 kmem_free(zfsvfs
, sizeof (zfsvfs_t
));
1076 zfs_set_fuid_feature(zfsvfs_t
*zfsvfs
)
1078 zfsvfs
->z_use_fuids
= USE_FUIDS(zfsvfs
->z_version
, zfsvfs
->z_os
);
1079 if (zfsvfs
->z_use_fuids
&& zfsvfs
->z_vfs
) {
1080 vfs_set_feature(zfsvfs
->z_vfs
, VFSFT_XVATTR
);
1081 vfs_set_feature(zfsvfs
->z_vfs
, VFSFT_SYSATTR_VIEWS
);
1082 vfs_set_feature(zfsvfs
->z_vfs
, VFSFT_ACEMASKONACCESS
);
1083 vfs_set_feature(zfsvfs
->z_vfs
, VFSFT_ACLONCREATE
);
1084 vfs_set_feature(zfsvfs
->z_vfs
, VFSFT_ACCESS_FILTER
);
1085 vfs_set_feature(zfsvfs
->z_vfs
, VFSFT_REPARSE
);
1087 zfsvfs
->z_use_sa
= USE_SA(zfsvfs
->z_version
, zfsvfs
->z_os
);
1091 zfs_domount(vfs_t
*vfsp
, char *osname
)
1094 uint64_t recordsize
, fsid_guid
;
1101 error
= zfsvfs_create(osname
, &zfsvfs
);
1104 zfsvfs
->z_vfs
= vfsp
;
1106 /* Initialize the generic filesystem structure. */
1107 vfsp
->vfs_bcount
= 0;
1108 vfsp
->vfs_data
= NULL
;
1110 if (zfs_create_unique_device(&mount_dev
) == -1) {
1114 ASSERT(vfs_devismounted(mount_dev
) == 0);
1116 if ((error
= dsl_prop_get_integer(osname
, "recordsize",
1117 &recordsize
, NULL
)))
1120 vfsp
->vfs_dev
= mount_dev
;
1121 vfsp
->vfs_fstype
= zfsfstype
;
1122 vfsp
->vfs_bsize
= recordsize
;
1123 vfsp
->vfs_flag
|= VFS_NOTRUNC
;
1124 vfsp
->vfs_data
= zfsvfs
;
1127 * The fsid is 64 bits, composed of an 8-bit fs type, which
1128 * separates our fsid from any other filesystem types, and a
1129 * 56-bit objset unique ID. The objset unique ID is unique to
1130 * all objsets open on this system, provided by unique_create().
1131 * The 8-bit fs type must be put in the low bits of fsid[1]
1132 * because that's where other Solaris filesystems put it.
1134 fsid_guid
= dmu_objset_fsid_guid(zfsvfs
->z_os
);
1135 ASSERT((fsid_guid
& ~((1ULL<<56)-1)) == 0);
1136 vfsp
->vfs_fsid
.val
[0] = fsid_guid
;
1137 vfsp
->vfs_fsid
.val
[1] = ((fsid_guid
>>32) << 8) |
1141 * Set features for file system.
1143 zfs_set_fuid_feature(zfsvfs
);
1144 if (zfsvfs
->z_case
== ZFS_CASE_INSENSITIVE
) {
1145 vfs_set_feature(vfsp
, VFSFT_DIRENTFLAGS
);
1146 vfs_set_feature(vfsp
, VFSFT_CASEINSENSITIVE
);
1147 vfs_set_feature(vfsp
, VFSFT_NOCASESENSITIVE
);
1148 } else if (zfsvfs
->z_case
== ZFS_CASE_MIXED
) {
1149 vfs_set_feature(vfsp
, VFSFT_DIRENTFLAGS
);
1150 vfs_set_feature(vfsp
, VFSFT_CASEINSENSITIVE
);
1152 vfs_set_feature(vfsp
, VFSFT_ZEROCOPY_SUPPORTED
);
1154 if (dmu_objset_is_snapshot(zfsvfs
->z_os
)) {
1157 atime_changed_cb(zfsvfs
, B_FALSE
);
1158 readonly_changed_cb(zfsvfs
, B_TRUE
);
1159 if ((error
= dsl_prop_get_integer(osname
,"xattr",&pval
,NULL
)))
1161 xattr_changed_cb(zfsvfs
, pval
);
1162 zfsvfs
->z_issnap
= B_TRUE
;
1163 zfsvfs
->z_os
->os_sync
= ZFS_SYNC_DISABLED
;
1165 mutex_enter(&zfsvfs
->z_os
->os_user_ptr_lock
);
1166 dmu_objset_set_user(zfsvfs
->z_os
, zfsvfs
);
1167 mutex_exit(&zfsvfs
->z_os
->os_user_ptr_lock
);
1169 error
= zfsvfs_setup(zfsvfs
, B_TRUE
);
1172 if (!zfsvfs
->z_issnap
)
1173 zfsctl_create(zfsvfs
);
1176 dmu_objset_disown(zfsvfs
->z_os
, zfsvfs
);
1177 zfsvfs_free(zfsvfs
);
1179 atomic_add_32(&zfs_active_fs_count
, 1);
1184 EXPORT_SYMBOL(zfs_domount
);
1187 zfs_unregister_callbacks(zfsvfs_t
*zfsvfs
)
1189 objset_t
*os
= zfsvfs
->z_os
;
1190 struct dsl_dataset
*ds
;
1193 * Unregister properties.
1195 if (!dmu_objset_is_snapshot(os
)) {
1196 ds
= dmu_objset_ds(os
);
1197 VERIFY(dsl_prop_unregister(ds
, "atime", atime_changed_cb
,
1200 VERIFY(dsl_prop_unregister(ds
, "xattr", xattr_changed_cb
,
1203 VERIFY(dsl_prop_unregister(ds
, "recordsize", blksz_changed_cb
,
1206 VERIFY(dsl_prop_unregister(ds
, "readonly", readonly_changed_cb
,
1209 VERIFY(dsl_prop_unregister(ds
, "devices", devices_changed_cb
,
1212 VERIFY(dsl_prop_unregister(ds
, "setuid", setuid_changed_cb
,
1215 VERIFY(dsl_prop_unregister(ds
, "exec", exec_changed_cb
,
1218 VERIFY(dsl_prop_unregister(ds
, "snapdir", snapdir_changed_cb
,
1221 VERIFY(dsl_prop_unregister(ds
, "aclinherit",
1222 acl_inherit_changed_cb
, zfsvfs
) == 0);
1224 VERIFY(dsl_prop_unregister(ds
, "vscan",
1225 vscan_changed_cb
, zfsvfs
) == 0);
1228 EXPORT_SYMBOL(zfs_unregister_callbacks
);
1230 #ifdef HAVE_MLSLABEL
1232 * zfs_check_global_label:
1233 * Check that the hex label string is appropriate for the dataset
1234 * being mounted into the global_zone proper.
1236 * Return an error if the hex label string is not default or
1237 * admin_low/admin_high. For admin_low labels, the corresponding
1238 * dataset must be readonly.
1241 zfs_check_global_label(const char *dsname
, const char *hexsl
)
1243 if (strcasecmp(hexsl
, ZFS_MLSLABEL_DEFAULT
) == 0)
1245 if (strcasecmp(hexsl
, ADMIN_HIGH
) == 0)
1247 if (strcasecmp(hexsl
, ADMIN_LOW
) == 0) {
1248 /* must be readonly */
1251 if (dsl_prop_get_integer(dsname
,
1252 zfs_prop_to_name(ZFS_PROP_READONLY
), &rdonly
, NULL
))
1254 return (rdonly
? 0 : EACCES
);
1258 #endif /* HAVE_MLSLABEL */
1261 * zfs_mount_label_policy:
1262 * Determine whether the mount is allowed according to MAC check.
1263 * by comparing (where appropriate) label of the dataset against
1264 * the label of the zone being mounted into. If the dataset has
1265 * no label, create one.
1268 * 0 : access allowed
1269 * >0 : error code, such as EACCES
1272 zfs_mount_label_policy(vfs_t
*vfsp
, char *osname
)
1275 zone_t
*mntzone
= NULL
;
1276 ts_label_t
*mnt_tsl
;
1279 char ds_hexsl
[MAXNAMELEN
];
1281 retv
= EACCES
; /* assume the worst */
1284 * Start by getting the dataset label if it exists.
1286 error
= dsl_prop_get(osname
, zfs_prop_to_name(ZFS_PROP_MLSLABEL
),
1287 1, sizeof (ds_hexsl
), &ds_hexsl
, NULL
);
1292 * If labeling is NOT enabled, then disallow the mount of datasets
1293 * which have a non-default label already. No other label checks
1296 if (!is_system_labeled()) {
1297 if (strcasecmp(ds_hexsl
, ZFS_MLSLABEL_DEFAULT
) == 0)
1303 * Get the label of the mountpoint. If mounting into the global
1304 * zone (i.e. mountpoint is not within an active zone and the
1305 * zoned property is off), the label must be default or
1306 * admin_low/admin_high only; no other checks are needed.
1308 mntzone
= zone_find_by_any_path(refstr_value(vfsp
->vfs_mntpt
), B_FALSE
);
1309 if (mntzone
->zone_id
== GLOBAL_ZONEID
) {
1314 if (dsl_prop_get_integer(osname
,
1315 zfs_prop_to_name(ZFS_PROP_ZONED
), &zoned
, NULL
))
1318 return (zfs_check_global_label(osname
, ds_hexsl
));
1321 * This is the case of a zone dataset being mounted
1322 * initially, before the zone has been fully created;
1323 * allow this mount into global zone.
1328 mnt_tsl
= mntzone
->zone_slabel
;
1329 ASSERT(mnt_tsl
!= NULL
);
1330 label_hold(mnt_tsl
);
1331 mnt_sl
= label2bslabel(mnt_tsl
);
1333 if (strcasecmp(ds_hexsl
, ZFS_MLSLABEL_DEFAULT
) == 0) {
1335 * The dataset doesn't have a real label, so fabricate one.
1339 if (l_to_str_internal(mnt_sl
, &str
) == 0 &&
1340 dsl_prop_set(osname
, zfs_prop_to_name(ZFS_PROP_MLSLABEL
),
1341 ZPROP_SRC_LOCAL
, 1, strlen(str
) + 1, str
) == 0)
1344 kmem_free(str
, strlen(str
) + 1);
1345 } else if (hexstr_to_label(ds_hexsl
, &ds_sl
) == 0) {
1347 * Now compare labels to complete the MAC check. If the
1348 * labels are equal then allow access. If the mountpoint
1349 * label dominates the dataset label, allow readonly access.
1350 * Otherwise, access is denied.
1352 if (blequal(mnt_sl
, &ds_sl
))
1354 else if (bldominates(mnt_sl
, &ds_sl
)) {
1355 vfs_setmntopt(vfsp
, MNTOPT_RO
, NULL
, 0);
1360 label_rele(mnt_tsl
);
1366 zfs_mountroot(vfs_t
*vfsp
, enum whymountroot why
)
1369 static int zfsrootdone
= 0;
1370 zfsvfs_t
*zfsvfs
= NULL
;
1379 * The filesystem that we mount as root is defined in the
1380 * boot property "zfs-bootfs" with a format of
1381 * "poolname/root-dataset-objnum".
1383 if (why
== ROOT_INIT
) {
1387 * the process of doing a spa_load will require the
1388 * clock to be set before we could (for example) do
1389 * something better by looking at the timestamp on
1390 * an uberblock, so just set it to -1.
1394 if ((zfs_bootfs
= spa_get_bootprop("zfs-bootfs")) == NULL
) {
1395 cmn_err(CE_NOTE
, "spa_get_bootfs: can not get "
1399 zfs_devid
= spa_get_bootprop("diskdevid");
1400 error
= spa_import_rootpool(rootfs
.bo_name
, zfs_devid
);
1402 spa_free_bootprop(zfs_devid
);
1404 spa_free_bootprop(zfs_bootfs
);
1405 cmn_err(CE_NOTE
, "spa_import_rootpool: error %d",
1409 if (error
= zfs_parse_bootfs(zfs_bootfs
, rootfs
.bo_name
)) {
1410 spa_free_bootprop(zfs_bootfs
);
1411 cmn_err(CE_NOTE
, "zfs_parse_bootfs: error %d",
1416 spa_free_bootprop(zfs_bootfs
);
1418 if (error
= vfs_lock(vfsp
))
1421 if (error
= zfs_domount(vfsp
, rootfs
.bo_name
)) {
1422 cmn_err(CE_NOTE
, "zfs_domount: error %d", error
);
1426 zfsvfs
= (zfsvfs_t
*)vfsp
->vfs_data
;
1428 if (error
= zfs_zget(zfsvfs
, zfsvfs
->z_root
, &zp
)) {
1429 cmn_err(CE_NOTE
, "zfs_zget: error %d", error
);
1434 mutex_enter(&vp
->v_lock
);
1435 vp
->v_flag
|= VROOT
;
1436 mutex_exit(&vp
->v_lock
);
1440 * Leave rootvp held. The root file system is never unmounted.
1443 vfs_add((struct vnode
*)0, vfsp
,
1444 (vfsp
->vfs_flag
& VFS_RDONLY
) ? MS_RDONLY
: 0);
1448 } else if (why
== ROOT_REMOUNT
) {
1449 readonly_changed_cb(vfsp
->vfs_data
, B_FALSE
);
1450 vfsp
->vfs_flag
|= VFS_REMOUNT
;
1452 /* refresh mount options */
1453 zfs_unregister_callbacks(vfsp
->vfs_data
);
1454 return (zfs_register_callbacks(vfsp
));
1456 } else if (why
== ROOT_UNMOUNT
) {
1457 zfs_unregister_callbacks((zfsvfs_t
*)vfsp
->vfs_data
);
1458 (void) zfs_sync(vfsp
, 0, 0);
1463 * if "why" is equal to anything else other than ROOT_INIT,
1464 * ROOT_REMOUNT, or ROOT_UNMOUNT, we do not support it.
1471 zfs_mount(vfs_t
*vfsp
, vnode_t
*mvp
, struct mounta
*uap
, cred_t
*cr
)
1476 uio_seg_t fromspace
= (uap
->flags
& MS_SYSSPACE
) ?
1477 UIO_SYSSPACE
: UIO_USERSPACE
;
1480 if (mvp
->v_type
!= VDIR
)
1483 mutex_enter(&mvp
->v_lock
);
1484 if ((uap
->flags
& MS_REMOUNT
) == 0 &&
1485 (uap
->flags
& MS_OVERLAY
) == 0 &&
1486 (mvp
->v_count
!= 1 || (mvp
->v_flag
& VROOT
))) {
1487 mutex_exit(&mvp
->v_lock
);
1490 mutex_exit(&mvp
->v_lock
);
1493 * ZFS does not support passing unparsed data in via MS_DATA.
1494 * Users should use the MS_OPTIONSTR interface; this means
1495 * that all option parsing is already done and the options struct
1496 * can be interrogated.
1498 if ((uap
->flags
& MS_DATA
) && uap
->datalen
> 0)
1502 * Get the objset name (the "special" mount argument).
1504 if ((error
= pn_get(uap
->spec
, fromspace
, &spn
)))
1507 osname
= spn
.pn_path
;
1510 * Check for mount privilege?
1512 * If we don't have privilege then see if
1513 * we have local permission to allow it
1515 error
= secpolicy_fs_mount(cr
, mvp
, vfsp
);
1517 if (dsl_deleg_access(osname
, ZFS_DELEG_PERM_MOUNT
, cr
) == 0) {
1521 * Make sure user is the owner of the mount point
1522 * or has sufficient privileges.
1525 vattr
.va_mask
= AT_UID
;
1527 if (VOP_GETATTR(mvp
, &vattr
, 0, cr
, NULL
)) {
1531 if (secpolicy_vnode_owner(cr
, vattr
.va_uid
) != 0 &&
1532 VOP_ACCESS(mvp
, VWRITE
, 0, cr
, NULL
) != 0) {
1535 secpolicy_fs_mount_clearopts(cr
, vfsp
);
1542 * Refuse to mount a filesystem if we are in a local zone and the
1543 * dataset is not visible.
1545 if (!INGLOBALZONE(curproc
) &&
1546 (!zone_dataset_visible(osname
, &canwrite
) || !canwrite
)) {
1551 error
= zfs_mount_label_policy(vfsp
, osname
);
1556 * When doing a remount, we simply refresh our temporary properties
1557 * according to those options set in the current VFS options.
1559 if (uap
->flags
& MS_REMOUNT
) {
1560 /* refresh mount options */
1561 zfs_unregister_callbacks(vfsp
->vfs_data
);
1562 error
= zfs_register_callbacks(vfsp
);
1566 error
= zfs_domount(vfsp
, osname
);
1569 * Add an extra VFS_HOLD on our parent vfs so that it can't
1570 * disappear due to a forced unmount.
1572 if (error
== 0 && ((zfsvfs_t
*)vfsp
->vfs_data
)->z_issnap
)
1573 VFS_HOLD(mvp
->v_vfsp
);
1581 zfs_statvfs(vfs_t
*vfsp
, struct statvfs64
*statp
)
1583 zfsvfs_t
*zfsvfs
= vfsp
->vfs_data
;
1585 uint64_t refdbytes
, availbytes
, usedobjs
, availobjs
;
1589 dmu_objset_space(zfsvfs
->z_os
,
1590 &refdbytes
, &availbytes
, &usedobjs
, &availobjs
);
1593 * The underlying storage pool actually uses multiple block sizes.
1594 * We report the fragsize as the smallest block size we support,
1595 * and we report our blocksize as the filesystem's maximum blocksize.
1597 statp
->f_frsize
= 1UL << SPA_MINBLOCKSHIFT
;
1598 statp
->f_bsize
= zfsvfs
->z_max_blksz
;
1601 * The following report "total" blocks of various kinds in the
1602 * file system, but reported in terms of f_frsize - the
1606 statp
->f_blocks
= (refdbytes
+ availbytes
) >> SPA_MINBLOCKSHIFT
;
1607 statp
->f_bfree
= availbytes
>> SPA_MINBLOCKSHIFT
;
1608 statp
->f_bavail
= statp
->f_bfree
; /* no root reservation */
1611 * statvfs() should really be called statufs(), because it assumes
1612 * static metadata. ZFS doesn't preallocate files, so the best
1613 * we can do is report the max that could possibly fit in f_files,
1614 * and that minus the number actually used in f_ffree.
1615 * For f_ffree, report the smaller of the number of object available
1616 * and the number of blocks (each object will take at least a block).
1618 statp
->f_ffree
= MIN(availobjs
, statp
->f_bfree
);
1619 statp
->f_favail
= statp
->f_ffree
; /* no "root reservation" */
1620 statp
->f_files
= statp
->f_ffree
+ usedobjs
;
1622 (void) cmpldev(&d32
, vfsp
->vfs_dev
);
1623 statp
->f_fsid
= d32
;
1626 * We're a zfs filesystem.
1628 (void) strcpy(statp
->f_basetype
, vfssw
[vfsp
->vfs_fstype
].vsw_name
);
1630 statp
->f_flag
= vf_to_stf(vfsp
->vfs_flag
);
1632 statp
->f_namemax
= ZFS_MAXNAMELEN
;
1635 * We have all of 32 characters to stuff a string here.
1636 * Is there anything useful we could/should provide?
1638 bzero(statp
->f_fstr
, sizeof (statp
->f_fstr
));
1643 EXPORT_SYMBOL(zfs_statvfs
);
1646 zfs_root(vfs_t
*vfsp
, vnode_t
**vpp
)
1648 zfsvfs_t
*zfsvfs
= vfsp
->vfs_data
;
1654 error
= zfs_zget(zfsvfs
, zfsvfs
->z_root
, &rootzp
);
1656 *vpp
= ZTOV(rootzp
);
1661 EXPORT_SYMBOL(zfs_root
);
1664 * Teardown the zfsvfs::z_os.
1666 * Note, if 'unmounting' if FALSE, we return with the 'z_teardown_lock'
1667 * and 'z_teardown_inactive_lock' held.
1670 zfsvfs_teardown(zfsvfs_t
*zfsvfs
, boolean_t unmounting
)
1674 rrw_enter(&zfsvfs
->z_teardown_lock
, RW_WRITER
, FTAG
);
1678 * We purge the parent filesystem's vfsp as the parent
1679 * filesystem and all of its snapshots have their vnode's
1680 * v_vfsp set to the parent's filesystem's vfsp. Note,
1681 * 'z_parent' is self referential for non-snapshots.
1683 (void) dnlc_purge_vfsp(zfsvfs
->z_parent
->z_vfs
, 0);
1687 * Close the zil. NB: Can't close the zil while zfs_inactive
1688 * threads are blocked as zil_close can call zfs_inactive.
1690 if (zfsvfs
->z_log
) {
1691 zil_close(zfsvfs
->z_log
);
1692 zfsvfs
->z_log
= NULL
;
1695 rw_enter(&zfsvfs
->z_teardown_inactive_lock
, RW_WRITER
);
1698 * If we are not unmounting (ie: online recv) and someone already
1699 * unmounted this file system while we were doing the switcheroo,
1700 * or a reopen of z_os failed then just bail out now.
1702 if (!unmounting
&& (zfsvfs
->z_unmounted
|| zfsvfs
->z_os
== NULL
)) {
1703 rw_exit(&zfsvfs
->z_teardown_inactive_lock
);
1704 rrw_exit(&zfsvfs
->z_teardown_lock
, FTAG
);
1709 * At this point there are no vops active, and any new vops will
1710 * fail with EIO since we have z_teardown_lock for writer (only
1711 * relavent for forced unmount).
1713 * Release all holds on dbufs.
1715 mutex_enter(&zfsvfs
->z_znodes_lock
);
1716 for (zp
= list_head(&zfsvfs
->z_all_znodes
); zp
!= NULL
;
1717 zp
= list_next(&zfsvfs
->z_all_znodes
, zp
))
1719 ASSERT(ZTOV(zp
)->v_count
> 0);
1720 zfs_znode_dmu_fini(zp
);
1722 mutex_exit(&zfsvfs
->z_znodes_lock
);
1725 * If we are unmounting, set the unmounted flag and let new vops
1726 * unblock. zfs_inactive will have the unmounted behavior, and all
1727 * other vops will fail with EIO.
1730 zfsvfs
->z_unmounted
= B_TRUE
;
1731 rrw_exit(&zfsvfs
->z_teardown_lock
, FTAG
);
1732 rw_exit(&zfsvfs
->z_teardown_inactive_lock
);
1736 * z_os will be NULL if there was an error in attempting to reopen
1737 * zfsvfs, so just return as the properties had already been
1738 * unregistered and cached data had been evicted before.
1740 if (zfsvfs
->z_os
== NULL
)
1744 * Unregister properties.
1746 zfs_unregister_callbacks(zfsvfs
);
1751 if (dmu_objset_is_dirty_anywhere(zfsvfs
->z_os
))
1752 if (!(zfsvfs
->z_vfs
->vfs_flag
& VFS_RDONLY
))
1753 txg_wait_synced(dmu_objset_pool(zfsvfs
->z_os
), 0);
1754 (void) dmu_objset_evict_dbufs(zfsvfs
->z_os
);
1761 zfs_umount(vfs_t
*vfsp
, int fflag
, cred_t
*cr
)
1763 zfsvfs_t
*zfsvfs
= vfsp
->vfs_data
;
1767 ret
= secpolicy_fs_unmount(cr
, vfsp
);
1769 if (dsl_deleg_access((char *)refstr_value(vfsp
->vfs_resource
),
1770 ZFS_DELEG_PERM_MOUNT
, cr
))
1775 * We purge the parent filesystem's vfsp as the parent filesystem
1776 * and all of its snapshots have their vnode's v_vfsp set to the
1777 * parent's filesystem's vfsp. Note, 'z_parent' is self
1778 * referential for non-snapshots.
1780 (void) dnlc_purge_vfsp(zfsvfs
->z_parent
->z_vfs
, 0);
1783 * Unmount any snapshots mounted under .zfs before unmounting the
1786 if (zfsvfs
->z_ctldir
!= NULL
&&
1787 (ret
= zfsctl_umount_snapshots(vfsp
, fflag
, cr
)) != 0) {
1791 if (!(fflag
& MS_FORCE
)) {
1793 * Check the number of active vnodes in the file system.
1794 * Our count is maintained in the vfs structure, but the
1795 * number is off by 1 to indicate a hold on the vfs
1798 * The '.zfs' directory maintains a reference of its
1799 * own, and any active references underneath are
1800 * reflected in the vnode count.
1802 if (zfsvfs
->z_ctldir
== NULL
) {
1803 if (vfsp
->vfs_count
> 1)
1806 if (vfsp
->vfs_count
> 2 ||
1807 zfsvfs
->z_ctldir
->v_count
> 1)
1812 vfsp
->vfs_flag
|= VFS_UNMOUNTED
;
1814 VERIFY(zfsvfs_teardown(zfsvfs
, B_TRUE
) == 0);
1818 * z_os will be NULL if there was an error in
1819 * attempting to reopen zfsvfs.
1823 * Unset the objset user_ptr.
1825 mutex_enter(&os
->os_user_ptr_lock
);
1826 dmu_objset_set_user(os
, NULL
);
1827 mutex_exit(&os
->os_user_ptr_lock
);
1830 * Finally release the objset
1832 dmu_objset_disown(os
, zfsvfs
);
1836 * We can now safely destroy the '.zfs' directory node.
1838 if (zfsvfs
->z_ctldir
!= NULL
)
1839 zfsctl_destroy(zfsvfs
);
1843 EXPORT_SYMBOL(zfs_umount
);
1846 zfs_vget(vfs_t
*vfsp
, vnode_t
**vpp
, fid_t
*fidp
)
1848 zfsvfs_t
*zfsvfs
= vfsp
->vfs_data
;
1850 uint64_t object
= 0;
1851 uint64_t fid_gen
= 0;
1860 if (fidp
->fid_len
== LONG_FID_LEN
) {
1861 zfid_long_t
*zlfid
= (zfid_long_t
*)fidp
;
1862 uint64_t objsetid
= 0;
1863 uint64_t setgen
= 0;
1865 for (i
= 0; i
< sizeof (zlfid
->zf_setid
); i
++)
1866 objsetid
|= ((uint64_t)zlfid
->zf_setid
[i
]) << (8 * i
);
1868 for (i
= 0; i
< sizeof (zlfid
->zf_setgen
); i
++)
1869 setgen
|= ((uint64_t)zlfid
->zf_setgen
[i
]) << (8 * i
);
1873 err
= zfsctl_lookup_objset(vfsp
, objsetid
, &zfsvfs
);
1879 if (fidp
->fid_len
== SHORT_FID_LEN
|| fidp
->fid_len
== LONG_FID_LEN
) {
1880 zfid_short_t
*zfid
= (zfid_short_t
*)fidp
;
1882 for (i
= 0; i
< sizeof (zfid
->zf_object
); i
++)
1883 object
|= ((uint64_t)zfid
->zf_object
[i
]) << (8 * i
);
1885 for (i
= 0; i
< sizeof (zfid
->zf_gen
); i
++)
1886 fid_gen
|= ((uint64_t)zfid
->zf_gen
[i
]) << (8 * i
);
1892 /* A zero fid_gen means we are in the .zfs control directories */
1894 (object
== ZFSCTL_INO_ROOT
|| object
== ZFSCTL_INO_SNAPDIR
)) {
1895 *vpp
= zfsvfs
->z_ctldir
;
1896 ASSERT(*vpp
!= NULL
);
1897 if (object
== ZFSCTL_INO_SNAPDIR
) {
1898 VERIFY(zfsctl_root_lookup(*vpp
, "snapshot", vpp
, NULL
,
1899 0, NULL
, NULL
, NULL
, NULL
, NULL
) == 0);
1907 gen_mask
= -1ULL >> (64 - 8 * i
);
1909 dprintf("getting %llu [%u mask %llx]\n", object
, fid_gen
, gen_mask
);
1910 if ((err
= zfs_zget(zfsvfs
, object
, &zp
))) {
1914 (void) sa_lookup(zp
->z_sa_hdl
, SA_ZPL_GEN(zfsvfs
), &zp_gen
,
1916 zp_gen
= zp_gen
& gen_mask
;
1919 if (zp
->z_unlinked
|| zp_gen
!= fid_gen
) {
1920 dprintf("znode gen (%u) != fid gen (%u)\n", zp_gen
, fid_gen
);
1928 zfs_inode_update(VTOZ(*vpp
));
1933 EXPORT_SYMBOL(zfs_vget
);
1936 * Block out VOPs and close zfsvfs_t::z_os
1938 * Note, if successful, then we return with the 'z_teardown_lock' and
1939 * 'z_teardown_inactive_lock' write held.
1942 zfs_suspend_fs(zfsvfs_t
*zfsvfs
)
1946 if ((error
= zfsvfs_teardown(zfsvfs
, B_FALSE
)) != 0)
1948 dmu_objset_disown(zfsvfs
->z_os
, zfsvfs
);
1952 EXPORT_SYMBOL(zfs_suspend_fs
);
1955 * Reopen zfsvfs_t::z_os and release VOPs.
1958 zfs_resume_fs(zfsvfs_t
*zfsvfs
, const char *osname
)
1962 ASSERT(RRW_WRITE_HELD(&zfsvfs
->z_teardown_lock
));
1963 ASSERT(RW_WRITE_HELD(&zfsvfs
->z_teardown_inactive_lock
));
1965 err
= dmu_objset_own(osname
, DMU_OST_ZFS
, B_FALSE
, zfsvfs
,
1968 zfsvfs
->z_os
= NULL
;
1971 uint64_t sa_obj
= 0;
1973 err2
= zap_lookup(zfsvfs
->z_os
, MASTER_NODE_OBJ
,
1974 ZFS_SA_ATTRS
, 8, 1, &sa_obj
);
1976 if ((err
|| err2
) && zfsvfs
->z_version
>= ZPL_VERSION_SA
)
1980 if ((err
= sa_setup(zfsvfs
->z_os
, sa_obj
,
1981 zfs_attr_table
, ZPL_END
, &zfsvfs
->z_attr_table
)) != 0)
1984 VERIFY(zfsvfs_setup(zfsvfs
, B_FALSE
) == 0);
1987 * Attempt to re-establish all the active znodes with
1988 * their dbufs. If a zfs_rezget() fails, then we'll let
1989 * any potential callers discover that via ZFS_ENTER_VERIFY_VP
1990 * when they try to use their znode.
1992 mutex_enter(&zfsvfs
->z_znodes_lock
);
1993 for (zp
= list_head(&zfsvfs
->z_all_znodes
); zp
;
1994 zp
= list_next(&zfsvfs
->z_all_znodes
, zp
)) {
1995 (void) zfs_rezget(zp
);
1997 mutex_exit(&zfsvfs
->z_znodes_lock
);
2002 /* release the VOPs */
2003 rw_exit(&zfsvfs
->z_teardown_inactive_lock
);
2004 rrw_exit(&zfsvfs
->z_teardown_lock
, FTAG
);
2008 * Since we couldn't reopen zfsvfs::z_os, force
2009 * unmount this file system.
2011 if (vn_vfswlock(zfsvfs
->z_vfs
->vfs_vnodecovered
) == 0)
2012 (void) dounmount(zfsvfs
->z_vfs
, MS_FORCE
, CRED());
2016 EXPORT_SYMBOL(zfs_resume_fs
);
2019 zfs_freevfs(vfs_t
*vfsp
)
2021 zfsvfs_t
*zfsvfs
= vfsp
->vfs_data
;
2024 * If this is a snapshot, we have an extra VFS_HOLD on our parent
2025 * from zfs_mount(). Release it here. If we came through
2026 * zfs_mountroot() instead, we didn't grab an extra hold, so
2027 * skip the VFS_RELE for rootvfs.
2029 if (zfsvfs
->z_issnap
&& (vfsp
!= rootvfs
))
2030 VFS_RELE(zfsvfs
->z_parent
->z_vfs
);
2032 zfsvfs_free(zfsvfs
);
2034 atomic_add_32(&zfs_active_fs_count
, -1);
2038 * VFS_INIT() initialization. Note that there is no VFS_FINI(),
2039 * so we can't safely do any non-idempotent initialization here.
2040 * Leave that to zfs_init() and zfs_fini(), which are called
2041 * from the module's _init() and _fini() entry points.
2045 zfs_vfsinit(int fstype
, char *name
)
2050 mutex_init(&zfs_dev_mtx
, NULL
, MUTEX_DEFAULT
, NULL
);
2053 * Unique major number for all zfs mounts.
2054 * If we run out of 32-bit minors, we'll getudev() another major.
2056 zfs_major
= ddi_name_to_major(ZFS_DRIVER
);
2057 zfs_minor
= ZFS_MIN_MINOR
;
2061 #endif /* HAVE_ZPL */
2068 * Initialize .zfs directory structures
2073 * Initialize znode cache, vnode ops, etc...
2076 #endif /* HAVE_ZPL */
2078 dmu_objset_register_type(DMU_OST_ZFS
, zfs_space_delta_cb
);
2087 #endif /* HAVE_ZPL */
2092 zfs_set_version(zfsvfs_t
*zfsvfs
, uint64_t newvers
)
2095 objset_t
*os
= zfsvfs
->z_os
;
2098 if (newvers
< ZPL_VERSION_INITIAL
|| newvers
> ZPL_VERSION
)
2101 if (newvers
< zfsvfs
->z_version
)
2104 if (zfs_spa_version_map(newvers
) >
2105 spa_version(dmu_objset_spa(zfsvfs
->z_os
)))
2108 tx
= dmu_tx_create(os
);
2109 dmu_tx_hold_zap(tx
, MASTER_NODE_OBJ
, B_FALSE
, ZPL_VERSION_STR
);
2110 if (newvers
>= ZPL_VERSION_SA
&& !zfsvfs
->z_use_sa
) {
2111 dmu_tx_hold_zap(tx
, MASTER_NODE_OBJ
, B_TRUE
,
2113 dmu_tx_hold_zap(tx
, DMU_NEW_OBJECT
, FALSE
, NULL
);
2115 error
= dmu_tx_assign(tx
, TXG_WAIT
);
2121 error
= zap_update(os
, MASTER_NODE_OBJ
, ZPL_VERSION_STR
,
2122 8, 1, &newvers
, tx
);
2129 if (newvers
>= ZPL_VERSION_SA
&& !zfsvfs
->z_use_sa
) {
2132 ASSERT3U(spa_version(dmu_objset_spa(zfsvfs
->z_os
)), >=,
2134 sa_obj
= zap_create(os
, DMU_OT_SA_MASTER_NODE
,
2135 DMU_OT_NONE
, 0, tx
);
2137 error
= zap_add(os
, MASTER_NODE_OBJ
,
2138 ZFS_SA_ATTRS
, 8, 1, &sa_obj
, tx
);
2139 ASSERT3U(error
, ==, 0);
2141 VERIFY(0 == sa_set_sa_object(os
, sa_obj
));
2142 sa_register_update_callback(os
, zfs_sa_upgrade
);
2145 spa_history_log_internal(LOG_DS_UPGRADE
,
2146 dmu_objset_spa(os
), tx
, "oldver=%llu newver=%llu dataset = %llu",
2147 zfsvfs
->z_version
, newvers
, dmu_objset_id(os
));
2151 zfsvfs
->z_version
= newvers
;
2153 if (zfsvfs
->z_version
>= ZPL_VERSION_FUID
)
2154 zfs_set_fuid_feature(zfsvfs
);
2158 EXPORT_SYMBOL(zfs_set_version
);
2159 #endif /* HAVE_ZPL */
2162 * Read a property stored within the master node.
2165 zfs_get_zplprop(objset_t
*os
, zfs_prop_t prop
, uint64_t *value
)
2171 * Look up the file system's value for the property. For the
2172 * version property, we look up a slightly different string.
2174 if (prop
== ZFS_PROP_VERSION
)
2175 pname
= ZPL_VERSION_STR
;
2177 pname
= zfs_prop_to_name(prop
);
2180 error
= zap_lookup(os
, MASTER_NODE_OBJ
, pname
, 8, 1, value
);
2182 if (error
== ENOENT
) {
2183 /* No value set, use the default value */
2185 case ZFS_PROP_VERSION
:
2186 *value
= ZPL_VERSION
;
2188 case ZFS_PROP_NORMALIZE
:
2189 case ZFS_PROP_UTF8ONLY
:
2193 *value
= ZFS_CASE_SENSITIVE
;