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_vnops.h>
42 #include <sys/zfs_dir.h>
44 #include <sys/fs/zfs.h>
46 #include <sys/dsl_prop.h>
47 #include <sys/dsl_dataset.h>
48 #include <sys/dsl_deleg.h>
52 #include <sys/varargs.h>
53 #include <sys/policy.h>
54 #include <sys/atomic.h>
55 #include <sys/mkdev.h>
56 #include <sys/modctl.h>
57 #include <sys/refstr.h>
58 #include <sys/zfs_ioctl.h>
59 #include <sys/zfs_ctldir.h>
60 #include <sys/zfs_fuid.h>
61 #include <sys/bootconf.h>
62 #include <sys/sunddi.h>
64 #include <sys/dmu_objset.h>
65 #include <sys/spa_boot.h>
68 #include "zfs_comutil.h"
73 zfs_sync(struct super_block *sb, int wait, cred_t *cr)
75 zfs_sb_t *zsb = sb->s_fs_info;
78 * Data integrity is job one. We don't want a compromised kernel
79 * writing to the storage pool, so we never sync during panic.
81 if (unlikely(oops_in_progress))
85 * Semantically, the only requirement is that the sync be initiated.
86 * The DMU syncs out txgs frequently, so there's nothing to do.
93 * Sync a specific filesystem.
98 dp = dmu_objset_pool(zsb->z_os);
101 * If the system is shutting down, then skip any
102 * filesystems which may exist on a suspended pool.
104 if (spa_suspended(dp->dp_spa)) {
109 if (zsb->z_log != NULL)
110 zil_commit(zsb->z_log, 0);
115 * Sync all ZFS filesystems. This is what happens when you
116 * run sync(1M). Unlike other filesystems, ZFS honors the
117 * request by waiting for all pools to commit all dirty data.
124 EXPORT_SYMBOL(zfs_sync);
127 zfs_is_readonly(zfs_sb_t *zsb)
129 return (!!(zsb->z_sb->s_flags & MS_RDONLY));
131 EXPORT_SYMBOL(zfs_is_readonly);
134 atime_changed_cb(void *arg, uint64_t newval)
136 ((zfs_sb_t *)arg)->z_atime = newval;
140 xattr_changed_cb(void *arg, uint64_t newval)
144 if (newval == ZFS_XATTR_OFF) {
145 zsb->z_flags &= ~ZSB_XATTR;
147 zsb->z_flags |= ZSB_XATTR;
149 if (newval == ZFS_XATTR_SA)
150 zsb->z_xattr_sa = B_TRUE;
152 zsb->z_xattr_sa = B_FALSE;
157 blksz_changed_cb(void *arg, uint64_t newval)
161 if (newval < SPA_MINBLOCKSIZE ||
162 newval > SPA_MAXBLOCKSIZE || !ISP2(newval))
163 newval = SPA_MAXBLOCKSIZE;
165 zsb->z_max_blksz = newval;
169 readonly_changed_cb(void *arg, uint64_t newval)
172 struct super_block *sb = zsb->z_sb;
178 sb->s_flags |= MS_RDONLY;
180 sb->s_flags &= ~MS_RDONLY;
184 devices_changed_cb(void *arg, uint64_t newval)
189 setuid_changed_cb(void *arg, uint64_t newval)
194 exec_changed_cb(void *arg, uint64_t newval)
199 nbmand_changed_cb(void *arg, uint64_t newval)
202 struct super_block *sb = zsb->z_sb;
208 sb->s_flags |= MS_MANDLOCK;
210 sb->s_flags &= ~MS_MANDLOCK;
214 snapdir_changed_cb(void *arg, uint64_t newval)
216 ((zfs_sb_t *)arg)->z_show_ctldir = newval;
220 vscan_changed_cb(void *arg, uint64_t newval)
222 ((zfs_sb_t *)arg)->z_vscan = newval;
226 acl_inherit_changed_cb(void *arg, uint64_t newval)
228 ((zfs_sb_t *)arg)->z_acl_inherit = newval;
232 zfs_register_callbacks(zfs_sb_t *zsb)
234 struct dsl_dataset *ds = NULL;
235 objset_t *os = zsb->z_os;
238 if (zfs_is_readonly(zsb) || !spa_writeable(dmu_objset_spa(os)))
239 readonly_changed_cb(zsb, B_TRUE);
242 * Register property callbacks.
244 * It would probably be fine to just check for i/o error from
245 * the first prop_register(), but I guess I like to go
248 ds = dmu_objset_ds(os);
249 error = dsl_prop_register(ds,
250 "atime", atime_changed_cb, zsb);
251 error = error ? error : dsl_prop_register(ds,
252 "xattr", xattr_changed_cb, zsb);
253 error = error ? error : dsl_prop_register(ds,
254 "recordsize", blksz_changed_cb, zsb);
255 error = error ? error : dsl_prop_register(ds,
256 "readonly", readonly_changed_cb, zsb);
257 error = error ? error : dsl_prop_register(ds,
258 "devices", devices_changed_cb, zsb);
259 error = error ? error : dsl_prop_register(ds,
260 "setuid", setuid_changed_cb, zsb);
261 error = error ? error : dsl_prop_register(ds,
262 "exec", exec_changed_cb, zsb);
263 error = error ? error : dsl_prop_register(ds,
264 "snapdir", snapdir_changed_cb, zsb);
265 error = error ? error : dsl_prop_register(ds,
266 "aclinherit", acl_inherit_changed_cb, zsb);
267 error = error ? error : dsl_prop_register(ds,
268 "vscan", vscan_changed_cb, zsb);
269 error = error ? error : dsl_prop_register(ds,
270 "nbmand", nbmand_changed_cb, zsb);
278 * We may attempt to unregister some callbacks that are not
279 * registered, but this is OK; it will simply return ENOMSG,
280 * which we will ignore.
282 (void) dsl_prop_unregister(ds, "atime", atime_changed_cb, zsb);
283 (void) dsl_prop_unregister(ds, "xattr", xattr_changed_cb, zsb);
284 (void) dsl_prop_unregister(ds, "recordsize", blksz_changed_cb, zsb);
285 (void) dsl_prop_unregister(ds, "readonly", readonly_changed_cb, zsb);
286 (void) dsl_prop_unregister(ds, "devices", devices_changed_cb, zsb);
287 (void) dsl_prop_unregister(ds, "setuid", setuid_changed_cb, zsb);
288 (void) dsl_prop_unregister(ds, "exec", exec_changed_cb, zsb);
289 (void) dsl_prop_unregister(ds, "snapdir", snapdir_changed_cb, zsb);
290 (void) dsl_prop_unregister(ds, "aclinherit", acl_inherit_changed_cb,
292 (void) dsl_prop_unregister(ds, "vscan", vscan_changed_cb, zsb);
293 (void) dsl_prop_unregister(ds, "nbmand", nbmand_changed_cb, zsb);
297 EXPORT_SYMBOL(zfs_register_callbacks);
300 zfs_space_delta_cb(dmu_object_type_t bonustype, void *data,
301 uint64_t *userp, uint64_t *groupp)
303 znode_phys_t *znp = data;
307 * Is it a valid type of object to track?
309 if (bonustype != DMU_OT_ZNODE && bonustype != DMU_OT_SA)
313 * If we have a NULL data pointer
314 * then assume the id's aren't changing and
315 * return EEXIST to the dmu to let it know to
321 if (bonustype == DMU_OT_ZNODE) {
322 *userp = znp->zp_uid;
323 *groupp = znp->zp_gid;
327 ASSERT(bonustype == DMU_OT_SA);
328 hdrsize = sa_hdrsize(data);
331 *userp = *((uint64_t *)((uintptr_t)data + hdrsize +
333 *groupp = *((uint64_t *)((uintptr_t)data + hdrsize +
337 * This should only happen for newly created
338 * files that haven't had the znode data filled
349 fuidstr_to_sid(zfs_sb_t *zsb, const char *fuidstr,
350 char *domainbuf, int buflen, uid_t *ridp)
355 fuid = strtonum(fuidstr, NULL);
357 domain = zfs_fuid_find_by_idx(zsb, FUID_INDEX(fuid));
359 (void) strlcpy(domainbuf, domain, buflen);
362 *ridp = FUID_RID(fuid);
366 zfs_userquota_prop_to_obj(zfs_sb_t *zsb, zfs_userquota_prop_t type)
369 case ZFS_PROP_USERUSED:
370 return (DMU_USERUSED_OBJECT);
371 case ZFS_PROP_GROUPUSED:
372 return (DMU_GROUPUSED_OBJECT);
373 case ZFS_PROP_USERQUOTA:
374 return (zsb->z_userquota_obj);
375 case ZFS_PROP_GROUPQUOTA:
376 return (zsb->z_groupquota_obj);
384 zfs_userspace_many(zfs_sb_t *zsb, zfs_userquota_prop_t type,
385 uint64_t *cookiep, void *vbuf, uint64_t *bufsizep)
390 zfs_useracct_t *buf = vbuf;
393 if (!dmu_objset_userspace_present(zsb->z_os))
396 obj = zfs_userquota_prop_to_obj(zsb, type);
402 for (zap_cursor_init_serialized(&zc, zsb->z_os, obj, *cookiep);
403 (error = zap_cursor_retrieve(&zc, &za)) == 0;
404 zap_cursor_advance(&zc)) {
405 if ((uintptr_t)buf - (uintptr_t)vbuf + sizeof (zfs_useracct_t) >
409 fuidstr_to_sid(zsb, za.za_name,
410 buf->zu_domain, sizeof (buf->zu_domain), &buf->zu_rid);
412 buf->zu_space = za.za_first_integer;
418 ASSERT3U((uintptr_t)buf - (uintptr_t)vbuf, <=, *bufsizep);
419 *bufsizep = (uintptr_t)buf - (uintptr_t)vbuf;
420 *cookiep = zap_cursor_serialize(&zc);
421 zap_cursor_fini(&zc);
424 EXPORT_SYMBOL(zfs_userspace_many);
427 * buf must be big enough (eg, 32 bytes)
430 id_to_fuidstr(zfs_sb_t *zsb, const char *domain, uid_t rid,
431 char *buf, boolean_t addok)
436 if (domain && domain[0]) {
437 domainid = zfs_fuid_find_by_domain(zsb, domain, NULL, addok);
441 fuid = FUID_ENCODE(domainid, rid);
442 (void) sprintf(buf, "%llx", (longlong_t)fuid);
447 zfs_userspace_one(zfs_sb_t *zsb, zfs_userquota_prop_t type,
448 const char *domain, uint64_t rid, uint64_t *valp)
456 if (!dmu_objset_userspace_present(zsb->z_os))
459 obj = zfs_userquota_prop_to_obj(zsb, type);
463 err = id_to_fuidstr(zsb, domain, rid, buf, B_FALSE);
467 err = zap_lookup(zsb->z_os, obj, buf, 8, 1, valp);
472 EXPORT_SYMBOL(zfs_userspace_one);
475 zfs_set_userquota(zfs_sb_t *zsb, zfs_userquota_prop_t type,
476 const char *domain, uint64_t rid, uint64_t quota)
482 boolean_t fuid_dirtied;
484 if (type != ZFS_PROP_USERQUOTA && type != ZFS_PROP_GROUPQUOTA)
487 if (zsb->z_version < ZPL_VERSION_USERSPACE)
490 objp = (type == ZFS_PROP_USERQUOTA) ? &zsb->z_userquota_obj :
491 &zsb->z_groupquota_obj;
493 err = id_to_fuidstr(zsb, domain, rid, buf, B_TRUE);
496 fuid_dirtied = zsb->z_fuid_dirty;
498 tx = dmu_tx_create(zsb->z_os);
499 dmu_tx_hold_zap(tx, *objp ? *objp : DMU_NEW_OBJECT, B_TRUE, NULL);
501 dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, B_TRUE,
502 zfs_userquota_prop_prefixes[type]);
505 zfs_fuid_txhold(zsb, tx);
506 err = dmu_tx_assign(tx, TXG_WAIT);
512 mutex_enter(&zsb->z_lock);
514 *objp = zap_create(zsb->z_os, DMU_OT_USERGROUP_QUOTA,
516 VERIFY(0 == zap_add(zsb->z_os, MASTER_NODE_OBJ,
517 zfs_userquota_prop_prefixes[type], 8, 1, objp, tx));
519 mutex_exit(&zsb->z_lock);
522 err = zap_remove(zsb->z_os, *objp, buf, tx);
526 err = zap_update(zsb->z_os, *objp, buf, 8, 1, "a, tx);
530 zfs_fuid_sync(zsb, tx);
534 EXPORT_SYMBOL(zfs_set_userquota);
537 zfs_fuid_overquota(zfs_sb_t *zsb, boolean_t isgroup, uint64_t fuid)
540 uint64_t used, quota, usedobj, quotaobj;
543 usedobj = isgroup ? DMU_GROUPUSED_OBJECT : DMU_USERUSED_OBJECT;
544 quotaobj = isgroup ? zsb->z_groupquota_obj : zsb->z_userquota_obj;
546 if (quotaobj == 0 || zsb->z_replay)
549 (void) sprintf(buf, "%llx", (longlong_t)fuid);
550 err = zap_lookup(zsb->z_os, quotaobj, buf, 8, 1, "a);
554 err = zap_lookup(zsb->z_os, usedobj, buf, 8, 1, &used);
557 return (used >= quota);
559 EXPORT_SYMBOL(zfs_fuid_overquota);
562 zfs_owner_overquota(zfs_sb_t *zsb, znode_t *zp, boolean_t isgroup)
567 quotaobj = isgroup ? zsb->z_groupquota_obj : zsb->z_userquota_obj;
569 fuid = isgroup ? zp->z_gid : zp->z_uid;
571 if (quotaobj == 0 || zsb->z_replay)
574 return (zfs_fuid_overquota(zsb, isgroup, fuid));
576 EXPORT_SYMBOL(zfs_owner_overquota);
579 zfs_sb_create(const char *osname, zfs_sb_t **zsbp)
587 zsb = kmem_zalloc(sizeof (zfs_sb_t), KM_SLEEP | KM_NODEBUG);
590 * We claim to always be readonly so we can open snapshots;
591 * other ZPL code will prevent us from writing to snapshots.
593 error = dmu_objset_own(osname, DMU_OST_ZFS, B_TRUE, zsb, &os);
595 kmem_free(zsb, sizeof (zfs_sb_t));
600 * Initialize the zfs-specific filesystem structure.
601 * Should probably make this a kmem cache, shuffle fields,
602 * and just bzero up to z_hold_mtx[].
606 zsb->z_max_blksz = SPA_MAXBLOCKSIZE;
607 zsb->z_show_ctldir = ZFS_SNAPDIR_VISIBLE;
610 error = zfs_get_zplprop(os, ZFS_PROP_VERSION, &zsb->z_version);
613 } else if (zsb->z_version >
614 zfs_zpl_version_map(spa_version(dmu_objset_spa(os)))) {
615 (void) printk("Can't mount a version %lld file system "
616 "on a version %lld pool\n. Pool must be upgraded to mount "
617 "this file system.", (u_longlong_t)zsb->z_version,
618 (u_longlong_t)spa_version(dmu_objset_spa(os)));
622 if ((error = zfs_get_zplprop(os, ZFS_PROP_NORMALIZE, &zval)) != 0)
624 zsb->z_norm = (int)zval;
626 if ((error = zfs_get_zplprop(os, ZFS_PROP_UTF8ONLY, &zval)) != 0)
628 zsb->z_utf8 = (zval != 0);
630 if ((error = zfs_get_zplprop(os, ZFS_PROP_CASE, &zval)) != 0)
632 zsb->z_case = (uint_t)zval;
635 * Fold case on file systems that are always or sometimes case
638 if (zsb->z_case == ZFS_CASE_INSENSITIVE ||
639 zsb->z_case == ZFS_CASE_MIXED)
640 zsb->z_norm |= U8_TEXTPREP_TOUPPER;
642 zsb->z_use_fuids = USE_FUIDS(zsb->z_version, zsb->z_os);
643 zsb->z_use_sa = USE_SA(zsb->z_version, zsb->z_os);
646 /* should either have both of these objects or none */
647 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_SA_ATTRS, 8, 1,
652 error = zfs_get_zplprop(os, ZFS_PROP_XATTR, &zval);
653 if ((error == 0) && (zval == ZFS_XATTR_SA))
654 zsb->z_xattr_sa = B_TRUE;
657 * Pre SA versions file systems should never touch
658 * either the attribute registration or layout objects.
663 error = sa_setup(os, sa_obj, zfs_attr_table, ZPL_END,
668 if (zsb->z_version >= ZPL_VERSION_SA)
669 sa_register_update_callback(os, zfs_sa_upgrade);
671 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_ROOT_OBJ, 8, 1,
675 ASSERT(zsb->z_root != 0);
677 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_UNLINKED_SET, 8, 1,
678 &zsb->z_unlinkedobj);
682 error = zap_lookup(os, MASTER_NODE_OBJ,
683 zfs_userquota_prop_prefixes[ZFS_PROP_USERQUOTA],
684 8, 1, &zsb->z_userquota_obj);
685 if (error && error != ENOENT)
688 error = zap_lookup(os, MASTER_NODE_OBJ,
689 zfs_userquota_prop_prefixes[ZFS_PROP_GROUPQUOTA],
690 8, 1, &zsb->z_groupquota_obj);
691 if (error && error != ENOENT)
694 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_FUID_TABLES, 8, 1,
696 if (error && error != ENOENT)
699 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_SHARES_DIR, 8, 1,
701 if (error && error != ENOENT)
704 mutex_init(&zsb->z_znodes_lock, NULL, MUTEX_DEFAULT, NULL);
705 mutex_init(&zsb->z_lock, NULL, MUTEX_DEFAULT, NULL);
706 list_create(&zsb->z_all_znodes, sizeof (znode_t),
707 offsetof(znode_t, z_link_node));
708 rrw_init(&zsb->z_teardown_lock);
709 rw_init(&zsb->z_teardown_inactive_lock, NULL, RW_DEFAULT, NULL);
710 rw_init(&zsb->z_fuid_lock, NULL, RW_DEFAULT, NULL);
711 for (i = 0; i != ZFS_OBJ_MTX_SZ; i++)
712 mutex_init(&zsb->z_hold_mtx[i], NULL, MUTEX_DEFAULT, NULL);
714 avl_create(&zsb->z_ctldir_snaps, snapentry_compare,
715 sizeof (zfs_snapentry_t), offsetof(zfs_snapentry_t, se_node));
716 mutex_init(&zsb->z_ctldir_lock, NULL, MUTEX_DEFAULT, NULL);
722 dmu_objset_disown(os, zsb);
724 kmem_free(zsb, sizeof (zfs_sb_t));
727 EXPORT_SYMBOL(zfs_sb_create);
730 zfs_sb_setup(zfs_sb_t *zsb, boolean_t mounting)
734 error = zfs_register_callbacks(zsb);
739 * Set the objset user_ptr to track its zsb.
741 mutex_enter(&zsb->z_os->os_user_ptr_lock);
742 dmu_objset_set_user(zsb->z_os, zsb);
743 mutex_exit(&zsb->z_os->os_user_ptr_lock);
745 zsb->z_log = zil_open(zsb->z_os, zfs_get_data);
748 * If we are not mounting (ie: online recv), then we don't
749 * have to worry about replaying the log as we blocked all
750 * operations out since we closed the ZIL.
756 * During replay we remove the read only flag to
757 * allow replays to succeed.
759 readonly = zfs_is_readonly(zsb);
761 readonly_changed_cb(zsb, B_FALSE);
763 zfs_unlinked_drain(zsb);
766 * Parse and replay the intent log.
768 * Because of ziltest, this must be done after
769 * zfs_unlinked_drain(). (Further note: ziltest
770 * doesn't use readonly mounts, where
771 * zfs_unlinked_drain() isn't called.) This is because
772 * ziltest causes spa_sync() to think it's committed,
773 * but actually it is not, so the intent log contains
774 * many txg's worth of changes.
776 * In particular, if object N is in the unlinked set in
777 * the last txg to actually sync, then it could be
778 * actually freed in a later txg and then reallocated
779 * in a yet later txg. This would write a "create
780 * object N" record to the intent log. Normally, this
781 * would be fine because the spa_sync() would have
782 * written out the fact that object N is free, before
783 * we could write the "create object N" intent log
786 * But when we are in ziltest mode, we advance the "open
787 * txg" without actually spa_sync()-ing the changes to
788 * disk. So we would see that object N is still
789 * allocated and in the unlinked set, and there is an
790 * intent log record saying to allocate it.
792 if (spa_writeable(dmu_objset_spa(zsb->z_os))) {
793 if (zil_replay_disable) {
794 zil_destroy(zsb->z_log, B_FALSE);
796 zsb->z_replay = B_TRUE;
797 zil_replay(zsb->z_os, zsb,
799 zsb->z_replay = B_FALSE;
803 /* restore readonly bit */
805 readonly_changed_cb(zsb, B_TRUE);
810 EXPORT_SYMBOL(zfs_sb_setup);
813 zfs_sb_free(zfs_sb_t *zsb)
817 zfs_fuid_destroy(zsb);
819 mutex_destroy(&zsb->z_znodes_lock);
820 mutex_destroy(&zsb->z_lock);
821 list_destroy(&zsb->z_all_znodes);
822 rrw_destroy(&zsb->z_teardown_lock);
823 rw_destroy(&zsb->z_teardown_inactive_lock);
824 rw_destroy(&zsb->z_fuid_lock);
825 for (i = 0; i != ZFS_OBJ_MTX_SZ; i++)
826 mutex_destroy(&zsb->z_hold_mtx[i]);
827 mutex_destroy(&zsb->z_ctldir_lock);
828 avl_destroy(&zsb->z_ctldir_snaps);
829 kmem_free(zsb, sizeof (zfs_sb_t));
831 EXPORT_SYMBOL(zfs_sb_free);
834 zfs_set_fuid_feature(zfs_sb_t *zsb)
836 zsb->z_use_fuids = USE_FUIDS(zsb->z_version, zsb->z_os);
837 zsb->z_use_sa = USE_SA(zsb->z_version, zsb->z_os);
841 zfs_unregister_callbacks(zfs_sb_t *zsb)
843 objset_t *os = zsb->z_os;
844 struct dsl_dataset *ds;
847 * Unregister properties.
849 if (!dmu_objset_is_snapshot(os)) {
850 ds = dmu_objset_ds(os);
851 VERIFY(dsl_prop_unregister(ds, "atime", atime_changed_cb,
854 VERIFY(dsl_prop_unregister(ds, "xattr", xattr_changed_cb,
857 VERIFY(dsl_prop_unregister(ds, "recordsize", blksz_changed_cb,
860 VERIFY(dsl_prop_unregister(ds, "readonly", readonly_changed_cb,
863 VERIFY(dsl_prop_unregister(ds, "devices", devices_changed_cb,
866 VERIFY(dsl_prop_unregister(ds, "setuid", setuid_changed_cb,
869 VERIFY(dsl_prop_unregister(ds, "exec", exec_changed_cb,
872 VERIFY(dsl_prop_unregister(ds, "snapdir", snapdir_changed_cb,
875 VERIFY(dsl_prop_unregister(ds, "aclinherit",
876 acl_inherit_changed_cb, zsb) == 0);
878 VERIFY(dsl_prop_unregister(ds, "vscan",
879 vscan_changed_cb, zsb) == 0);
881 VERIFY(dsl_prop_unregister(ds, "nbmand",
882 nbmand_changed_cb, zsb) == 0);
885 EXPORT_SYMBOL(zfs_unregister_callbacks);
889 * zfs_check_global_label:
890 * Check that the hex label string is appropriate for the dataset
891 * being mounted into the global_zone proper.
893 * Return an error if the hex label string is not default or
894 * admin_low/admin_high. For admin_low labels, the corresponding
895 * dataset must be readonly.
898 zfs_check_global_label(const char *dsname, const char *hexsl)
900 if (strcasecmp(hexsl, ZFS_MLSLABEL_DEFAULT) == 0)
902 if (strcasecmp(hexsl, ADMIN_HIGH) == 0)
904 if (strcasecmp(hexsl, ADMIN_LOW) == 0) {
905 /* must be readonly */
908 if (dsl_prop_get_integer(dsname,
909 zfs_prop_to_name(ZFS_PROP_READONLY), &rdonly, NULL))
911 return (rdonly ? 0 : EACCES);
915 EXPORT_SYMBOL(zfs_check_global_label);
916 #endif /* HAVE_MLSLABEL */
919 zfs_statvfs(struct dentry *dentry, struct kstatfs *statp)
921 zfs_sb_t *zsb = dentry->d_sb->s_fs_info;
922 uint64_t refdbytes, availbytes, usedobjs, availobjs;
928 dmu_objset_space(zsb->z_os,
929 &refdbytes, &availbytes, &usedobjs, &availobjs);
931 fsid = dmu_objset_fsid_guid(zsb->z_os);
933 * The underlying storage pool actually uses multiple block
934 * size. Under Solaris frsize (fragment size) is reported as
935 * the smallest block size we support, and bsize (block size)
936 * as the filesystem's maximum block size. Unfortunately,
937 * under Linux the fragment size and block size are often used
938 * interchangeably. Thus we are forced to report both of them
939 * as the filesystem's maximum block size.
941 statp->f_frsize = zsb->z_max_blksz;
942 statp->f_bsize = zsb->z_max_blksz;
943 bshift = fls(statp->f_bsize) - 1;
946 * The following report "total" blocks of various kinds in
947 * the file system, but reported in terms of f_bsize - the
951 statp->f_blocks = (refdbytes + availbytes) >> bshift;
952 statp->f_bfree = availbytes >> bshift;
953 statp->f_bavail = statp->f_bfree; /* no root reservation */
956 * statvfs() should really be called statufs(), because it assumes
957 * static metadata. ZFS doesn't preallocate files, so the best
958 * we can do is report the max that could possibly fit in f_files,
959 * and that minus the number actually used in f_ffree.
960 * For f_ffree, report the smaller of the number of object available
961 * and the number of blocks (each object will take at least a block).
963 statp->f_ffree = MIN(availobjs, availbytes >> DNODE_SHIFT);
964 statp->f_files = statp->f_ffree + usedobjs;
965 statp->f_fsid.val[0] = (uint32_t)fsid;
966 statp->f_fsid.val[1] = (uint32_t)(fsid >> 32);
967 statp->f_type = ZFS_SUPER_MAGIC;
968 statp->f_namelen = ZFS_MAXNAMELEN;
971 * We have all of 40 characters to stuff a string here.
972 * Is there anything useful we could/should provide?
974 bzero(statp->f_spare, sizeof (statp->f_spare));
979 EXPORT_SYMBOL(zfs_statvfs);
982 zfs_root(zfs_sb_t *zsb, struct inode **ipp)
989 error = zfs_zget(zsb, zsb->z_root, &rootzp);
996 EXPORT_SYMBOL(zfs_root);
1000 zfs_sb_prune(struct super_block *sb, unsigned long nr_to_scan, int *objects)
1002 zfs_sb_t *zsb = sb->s_fs_info;
1003 struct shrinker *shrinker = &sb->s_shrink;
1004 struct shrink_control sc = {
1005 .nr_to_scan = nr_to_scan,
1006 .gfp_mask = GFP_KERNEL,
1010 *objects = (*shrinker->shrink)(shrinker, &sc);
1015 EXPORT_SYMBOL(zfs_sb_prune);
1016 #endif /* HAVE_SHRINK */
1019 * Teardown the zfs_sb_t::z_os.
1021 * Note, if 'unmounting' if FALSE, we return with the 'z_teardown_lock'
1022 * and 'z_teardown_inactive_lock' held.
1025 zfs_sb_teardown(zfs_sb_t *zsb, boolean_t unmounting)
1029 rrw_enter(&zsb->z_teardown_lock, RW_WRITER, FTAG);
1033 * We purge the parent filesystem's super block as the
1034 * parent filesystem and all of its snapshots have their
1035 * inode's super block set to the parent's filesystem's
1036 * super block. Note, 'z_parent' is self referential
1037 * for non-snapshots.
1039 shrink_dcache_sb(zsb->z_parent->z_sb);
1040 (void) spl_invalidate_inodes(zsb->z_parent->z_sb, 0);
1044 * Close the zil. NB: Can't close the zil while zfs_inactive
1045 * threads are blocked as zil_close can call zfs_inactive.
1048 zil_close(zsb->z_log);
1052 rw_enter(&zsb->z_teardown_inactive_lock, RW_WRITER);
1055 * If we are not unmounting (ie: online recv) and someone already
1056 * unmounted this file system while we were doing the switcheroo,
1057 * or a reopen of z_os failed then just bail out now.
1059 if (!unmounting && (zsb->z_unmounted || zsb->z_os == NULL)) {
1060 rw_exit(&zsb->z_teardown_inactive_lock);
1061 rrw_exit(&zsb->z_teardown_lock, FTAG);
1066 * At this point there are no vops active, and any new vops will
1067 * fail with EIO since we have z_teardown_lock for writer (only
1068 * relavent for forced unmount).
1070 * Release all holds on dbufs.
1072 mutex_enter(&zsb->z_znodes_lock);
1073 for (zp = list_head(&zsb->z_all_znodes); zp != NULL;
1074 zp = list_next(&zsb->z_all_znodes, zp))
1076 ASSERT(atomic_read(&ZTOI(zp)->i_count) > 0);
1077 zfs_znode_dmu_fini(zp);
1079 mutex_exit(&zsb->z_znodes_lock);
1082 * If we are unmounting, set the unmounted flag and let new vops
1083 * unblock. zfs_inactive will have the unmounted behavior, and all
1084 * other vops will fail with EIO.
1087 zsb->z_unmounted = B_TRUE;
1088 rrw_exit(&zsb->z_teardown_lock, FTAG);
1089 rw_exit(&zsb->z_teardown_inactive_lock);
1093 * z_os will be NULL if there was an error in attempting to reopen
1094 * zsb, so just return as the properties had already been
1096 * unregistered and cached data had been evicted before.
1098 if (zsb->z_os == NULL)
1102 * Unregister properties.
1104 zfs_unregister_callbacks(zsb);
1109 if (dsl_dataset_is_dirty(dmu_objset_ds(zsb->z_os)) &&
1110 !zfs_is_readonly(zsb))
1111 txg_wait_synced(dmu_objset_pool(zsb->z_os), 0);
1112 (void) dmu_objset_evict_dbufs(zsb->z_os);
1116 EXPORT_SYMBOL(zfs_sb_teardown);
1118 #if defined(HAVE_BDI) && !defined(HAVE_BDI_SETUP_AND_REGISTER)
1119 atomic_long_t zfs_bdi_seq = ATOMIC_LONG_INIT(0);
1120 #endif /* HAVE_BDI && !HAVE_BDI_SETUP_AND_REGISTER */
1123 zfs_domount(struct super_block *sb, void *data, int silent)
1125 zpl_mount_data_t *zmd = data;
1126 const char *osname = zmd->z_osname;
1128 struct inode *root_inode;
1129 uint64_t recordsize;
1132 error = zfs_sb_create(osname, &zsb);
1136 if ((error = dsl_prop_get_integer(osname, "recordsize",
1137 &recordsize, NULL)))
1141 sb->s_fs_info = zsb;
1142 sb->s_magic = ZFS_SUPER_MAGIC;
1143 sb->s_maxbytes = MAX_LFS_FILESIZE;
1144 sb->s_time_gran = 1;
1145 sb->s_blocksize = recordsize;
1146 sb->s_blocksize_bits = ilog2(recordsize);
1150 * 2.6.32 API change,
1151 * Added backing_device_info (BDI) per super block interfaces. A BDI
1152 * must be configured when using a non-device backed filesystem for
1153 * proper writeback. This is not required for older pdflush kernels.
1155 * NOTE: Linux read-ahead is disabled in favor of zfs read-ahead.
1157 zsb->z_bdi.ra_pages = 0;
1158 sb->s_bdi = &zsb->z_bdi;
1160 error = -bdi_setup_and_register(&zsb->z_bdi, "zfs", BDI_CAP_MAP_COPY);
1163 #endif /* HAVE_BDI */
1165 /* Set callback operations for the file system. */
1166 sb->s_op = &zpl_super_operations;
1167 sb->s_xattr = zpl_xattr_handlers;
1168 sb->s_export_op = &zpl_export_operations;
1170 /* Set features for file system. */
1171 zfs_set_fuid_feature(zsb);
1173 if (dmu_objset_is_snapshot(zsb->z_os)) {
1176 atime_changed_cb(zsb, B_FALSE);
1177 readonly_changed_cb(zsb, B_TRUE);
1178 if ((error = dsl_prop_get_integer(osname,"xattr",&pval,NULL)))
1180 xattr_changed_cb(zsb, pval);
1181 zsb->z_issnap = B_TRUE;
1182 zsb->z_os->os_sync = ZFS_SYNC_DISABLED;
1184 mutex_enter(&zsb->z_os->os_user_ptr_lock);
1185 dmu_objset_set_user(zsb->z_os, zsb);
1186 mutex_exit(&zsb->z_os->os_user_ptr_lock);
1188 error = zfs_sb_setup(zsb, B_TRUE);
1191 /* Allocate a root inode for the filesystem. */
1192 error = zfs_root(zsb, &root_inode);
1194 (void) zfs_umount(sb);
1198 /* Allocate a root dentry for the filesystem */
1199 sb->s_root = d_make_root(root_inode);
1200 if (sb->s_root == NULL) {
1201 (void) zfs_umount(sb);
1210 dmu_objset_disown(zsb->z_os, zsb);
1216 EXPORT_SYMBOL(zfs_domount);
1219 * Called when an unmount is requested and certain sanity checks have
1220 * already passed. At this point no dentries or inodes have been reclaimed
1221 * from their respective caches. We drop the extra reference on the .zfs
1222 * control directory to allow everything to be reclaimed. All snapshots
1223 * must already have been unmounted to reach this point.
1226 zfs_preumount(struct super_block *sb)
1228 zfs_sb_t *zsb = sb->s_fs_info;
1230 if (zsb != NULL && zsb->z_ctldir != NULL)
1231 zfsctl_destroy(zsb);
1233 EXPORT_SYMBOL(zfs_preumount);
1236 * Called once all other unmount released tear down has occurred.
1237 * It is our responsibility to release any remaining infrastructure.
1241 zfs_umount(struct super_block *sb)
1243 zfs_sb_t *zsb = sb->s_fs_info;
1246 VERIFY(zfs_sb_teardown(zsb, B_TRUE) == 0);
1250 bdi_destroy(sb->s_bdi);
1251 #endif /* HAVE_BDI */
1254 * z_os will be NULL if there was an error in
1255 * attempting to reopen zsb.
1259 * Unset the objset user_ptr.
1261 mutex_enter(&os->os_user_ptr_lock);
1262 dmu_objset_set_user(os, NULL);
1263 mutex_exit(&os->os_user_ptr_lock);
1266 * Finally release the objset
1268 dmu_objset_disown(os, zsb);
1274 EXPORT_SYMBOL(zfs_umount);
1277 zfs_remount(struct super_block *sb, int *flags, char *data)
1280 * All namespace flags (MNT_*) and super block flags (MS_*) will
1281 * be handled by the Linux VFS. Only handle custom options here.
1285 EXPORT_SYMBOL(zfs_remount);
1288 zfs_vget(struct super_block *sb, struct inode **ipp, fid_t *fidp)
1290 zfs_sb_t *zsb = sb->s_fs_info;
1292 uint64_t object = 0;
1293 uint64_t fid_gen = 0;
1302 if (fidp->fid_len == LONG_FID_LEN) {
1303 zfid_long_t *zlfid = (zfid_long_t *)fidp;
1304 uint64_t objsetid = 0;
1305 uint64_t setgen = 0;
1307 for (i = 0; i < sizeof (zlfid->zf_setid); i++)
1308 objsetid |= ((uint64_t)zlfid->zf_setid[i]) << (8 * i);
1310 for (i = 0; i < sizeof (zlfid->zf_setgen); i++)
1311 setgen |= ((uint64_t)zlfid->zf_setgen[i]) << (8 * i);
1315 err = zfsctl_lookup_objset(sb, objsetid, &zsb);
1322 if (fidp->fid_len == SHORT_FID_LEN || fidp->fid_len == LONG_FID_LEN) {
1323 zfid_short_t *zfid = (zfid_short_t *)fidp;
1325 for (i = 0; i < sizeof (zfid->zf_object); i++)
1326 object |= ((uint64_t)zfid->zf_object[i]) << (8 * i);
1328 for (i = 0; i < sizeof (zfid->zf_gen); i++)
1329 fid_gen |= ((uint64_t)zfid->zf_gen[i]) << (8 * i);
1335 /* A zero fid_gen means we are in the .zfs control directories */
1337 (object == ZFSCTL_INO_ROOT || object == ZFSCTL_INO_SNAPDIR)) {
1338 *ipp = zsb->z_ctldir;
1339 ASSERT(*ipp != NULL);
1340 if (object == ZFSCTL_INO_SNAPDIR) {
1341 VERIFY(zfsctl_root_lookup(*ipp, "snapshot", ipp,
1342 0, kcred, NULL, NULL) == 0);
1350 gen_mask = -1ULL >> (64 - 8 * i);
1352 dprintf("getting %llu [%u mask %llx]\n", object, fid_gen, gen_mask);
1353 if ((err = zfs_zget(zsb, object, &zp))) {
1357 (void) sa_lookup(zp->z_sa_hdl, SA_ZPL_GEN(zsb), &zp_gen,
1359 zp_gen = zp_gen & gen_mask;
1362 if (zp->z_unlinked || zp_gen != fid_gen) {
1363 dprintf("znode gen (%u) != fid gen (%u)\n", zp_gen, fid_gen);
1371 zfs_inode_update(ITOZ(*ipp));
1376 EXPORT_SYMBOL(zfs_vget);
1379 * Block out VOPs and close zfs_sb_t::z_os
1381 * Note, if successful, then we return with the 'z_teardown_lock' and
1382 * 'z_teardown_inactive_lock' write held.
1385 zfs_suspend_fs(zfs_sb_t *zsb)
1389 if ((error = zfs_sb_teardown(zsb, B_FALSE)) != 0)
1391 dmu_objset_disown(zsb->z_os, zsb);
1395 EXPORT_SYMBOL(zfs_suspend_fs);
1398 * Reopen zfs_sb_t::z_os and release VOPs.
1401 zfs_resume_fs(zfs_sb_t *zsb, const char *osname)
1405 ASSERT(RRW_WRITE_HELD(&zsb->z_teardown_lock));
1406 ASSERT(RW_WRITE_HELD(&zsb->z_teardown_inactive_lock));
1408 err = dmu_objset_own(osname, DMU_OST_ZFS, B_FALSE, zsb, &zsb->z_os);
1413 uint64_t sa_obj = 0;
1415 err2 = zap_lookup(zsb->z_os, MASTER_NODE_OBJ,
1416 ZFS_SA_ATTRS, 8, 1, &sa_obj);
1418 if ((err || err2) && zsb->z_version >= ZPL_VERSION_SA)
1422 if ((err = sa_setup(zsb->z_os, sa_obj,
1423 zfs_attr_table, ZPL_END, &zsb->z_attr_table)) != 0)
1426 VERIFY(zfs_sb_setup(zsb, B_FALSE) == 0);
1429 * Attempt to re-establish all the active znodes with
1430 * their dbufs. If a zfs_rezget() fails, then we'll let
1431 * any potential callers discover that via ZFS_ENTER_VERIFY_VP
1432 * when they try to use their znode.
1434 mutex_enter(&zsb->z_znodes_lock);
1435 for (zp = list_head(&zsb->z_all_znodes); zp;
1436 zp = list_next(&zsb->z_all_znodes, zp)) {
1437 (void) zfs_rezget(zp);
1439 mutex_exit(&zsb->z_znodes_lock);
1444 /* release the VOPs */
1445 rw_exit(&zsb->z_teardown_inactive_lock);
1446 rrw_exit(&zsb->z_teardown_lock, FTAG);
1450 * Since we couldn't reopen zfs_sb_t::z_os, force
1451 * unmount this file system.
1453 (void) zfs_umount(zsb->z_sb);
1457 EXPORT_SYMBOL(zfs_resume_fs);
1460 zfs_set_version(zfs_sb_t *zsb, uint64_t newvers)
1463 objset_t *os = zsb->z_os;
1466 if (newvers < ZPL_VERSION_INITIAL || newvers > ZPL_VERSION)
1469 if (newvers < zsb->z_version)
1472 if (zfs_spa_version_map(newvers) >
1473 spa_version(dmu_objset_spa(zsb->z_os)))
1476 tx = dmu_tx_create(os);
1477 dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, B_FALSE, ZPL_VERSION_STR);
1478 if (newvers >= ZPL_VERSION_SA && !zsb->z_use_sa) {
1479 dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, B_TRUE,
1481 dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, FALSE, NULL);
1483 error = dmu_tx_assign(tx, TXG_WAIT);
1489 error = zap_update(os, MASTER_NODE_OBJ, ZPL_VERSION_STR,
1490 8, 1, &newvers, tx);
1497 if (newvers >= ZPL_VERSION_SA && !zsb->z_use_sa) {
1500 ASSERT3U(spa_version(dmu_objset_spa(zsb->z_os)), >=,
1502 sa_obj = zap_create(os, DMU_OT_SA_MASTER_NODE,
1503 DMU_OT_NONE, 0, tx);
1505 error = zap_add(os, MASTER_NODE_OBJ,
1506 ZFS_SA_ATTRS, 8, 1, &sa_obj, tx);
1507 ASSERT3U(error, ==, 0);
1509 VERIFY(0 == sa_set_sa_object(os, sa_obj));
1510 sa_register_update_callback(os, zfs_sa_upgrade);
1513 spa_history_log_internal(LOG_DS_UPGRADE,
1514 dmu_objset_spa(os), tx, "oldver=%llu newver=%llu dataset = %llu",
1515 zsb->z_version, newvers, dmu_objset_id(os));
1519 zsb->z_version = newvers;
1521 if (zsb->z_version >= ZPL_VERSION_FUID)
1522 zfs_set_fuid_feature(zsb);
1526 EXPORT_SYMBOL(zfs_set_version);
1529 * Read a property stored within the master node.
1532 zfs_get_zplprop(objset_t *os, zfs_prop_t prop, uint64_t *value)
1538 * Look up the file system's value for the property. For the
1539 * version property, we look up a slightly different string.
1541 if (prop == ZFS_PROP_VERSION)
1542 pname = ZPL_VERSION_STR;
1544 pname = zfs_prop_to_name(prop);
1547 error = zap_lookup(os, MASTER_NODE_OBJ, pname, 8, 1, value);
1549 if (error == ENOENT) {
1550 /* No value set, use the default value */
1552 case ZFS_PROP_VERSION:
1553 *value = ZPL_VERSION;
1555 case ZFS_PROP_NORMALIZE:
1556 case ZFS_PROP_UTF8ONLY:
1560 *value = ZFS_CASE_SENSITIVE;
1569 EXPORT_SYMBOL(zfs_get_zplprop);
1576 dmu_objset_register_type(DMU_OST_ZFS, zfs_space_delta_cb);
1577 register_filesystem(&zpl_fs_type);
1578 (void) arc_add_prune_callback(zpl_prune_sbs, NULL);
1584 unregister_filesystem(&zpl_fs_type);