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.
23 * Copyright (c) 2013 by Delphix. All rights reserved.
24 * Copyright 2015, OmniTI Computer Consulting, Inc. All rights reserved.
28 * ZFS control directory (a.k.a. ".zfs")
30 * This directory provides a common location for all ZFS meta-objects.
31 * Currently, this is only the 'snapshot' directory, but this may expand in the
32 * future. The elements are built using the GFS primitives, as the hierarchy
33 * does not actually exist on disk.
35 * For 'snapshot', we don't want to have all snapshots always mounted, because
36 * this would take up a huge amount of space in /etc/mnttab. We have three
39 * ctldir ------> snapshotdir -------> snapshot
45 * The 'snapshot' node contains just enough information to lookup '..' and act
46 * as a mountpoint for the snapshot. Whenever we lookup a specific snapshot, we
47 * perform an automount of the underlying filesystem and return the
48 * corresponding vnode.
50 * All mounts are handled automatically by the kernel, but unmounts are
51 * (currently) handled from user land. The main reason is that there is no
52 * reliable way to auto-unmount the filesystem when it's "no longer in use".
53 * When the user unmounts a filesystem, we call zfsctl_unmount(), which
54 * unmounts any snapshots within the snapshot directory.
56 * The '.zfs', '.zfs/snapshot', and all directories created under
57 * '.zfs/snapshot' (ie: '.zfs/snapshot/<snapname>') are all GFS nodes and
58 * share the same vfs_t as the head filesystem (what '.zfs' lives under).
60 * File systems mounted ontop of the GFS nodes '.zfs/snapshot/<snapname>'
61 * (ie: snapshots) are ZFS nodes and have their own unique vfs_t.
62 * However, vnodes within these mounted on file systems have their v_vfsp
63 * fields set to the head filesystem to make NFS happy (see
64 * zfsctl_snapdir_lookup()). We VFS_HOLD the head filesystem's vfs_t
65 * so that it cannot be freed until all snapshots have been unmounted.
68 #include <sys/zfs_context.h>
69 #include <sys/zfs_ctldir.h>
70 #include <sys/zfs_ioctl.h>
71 #include <sys/zfs_vfsops.h>
72 #include <sys/namei.h>
76 #include <sys/dsl_destroy.h>
77 #include <sys/dsl_deleg.h>
78 #include <sys/mount.h>
79 #include <sys/sunddi.h>
81 #include "zfs_namecheck.h"
83 typedef struct zfsctl_node {
84 gfs_dir_t zc_gfs_private;
86 timestruc_t zc_cmtime; /* ctime and mtime, always the same */
89 typedef struct zfsctl_snapdir {
90 zfsctl_node_t sd_node;
102 snapentry_compare(const void *a, const void *b)
104 const zfs_snapentry_t *sa = a;
105 const zfs_snapentry_t *sb = b;
106 int ret = strcmp(sa->se_name, sb->se_name);
117 vnodeops_t *zfsctl_ops_root;
118 vnodeops_t *zfsctl_ops_snapdir;
119 vnodeops_t *zfsctl_ops_snapshot;
120 vnodeops_t *zfsctl_ops_shares;
121 vnodeops_t *zfsctl_ops_shares_dir;
123 static const fs_operation_def_t zfsctl_tops_root[];
124 static const fs_operation_def_t zfsctl_tops_snapdir[];
125 static const fs_operation_def_t zfsctl_tops_snapshot[];
126 static const fs_operation_def_t zfsctl_tops_shares[];
128 static struct vop_vector zfsctl_ops_root;
129 static struct vop_vector zfsctl_ops_snapdir;
130 static struct vop_vector zfsctl_ops_snapshot;
131 static struct vop_vector zfsctl_ops_shares;
132 static struct vop_vector zfsctl_ops_shares_dir;
135 static vnode_t *zfsctl_mknode_snapdir(vnode_t *);
136 static vnode_t *zfsctl_mknode_shares(vnode_t *);
137 static vnode_t *zfsctl_snapshot_mknode(vnode_t *, uint64_t objset);
138 static int zfsctl_unmount_snap(zfs_snapentry_t *, int, cred_t *);
141 static gfs_opsvec_t zfsctl_opsvec[] = {
142 { ".zfs", zfsctl_tops_root, &zfsctl_ops_root },
143 { ".zfs/snapshot", zfsctl_tops_snapdir, &zfsctl_ops_snapdir },
144 { ".zfs/snapshot/vnode", zfsctl_tops_snapshot, &zfsctl_ops_snapshot },
145 { ".zfs/shares", zfsctl_tops_shares, &zfsctl_ops_shares_dir },
146 { ".zfs/shares/vnode", zfsctl_tops_shares, &zfsctl_ops_shares },
152 * Root directory elements. We only have two entries
153 * snapshot and shares.
155 static gfs_dirent_t zfsctl_root_entries[] = {
156 { "snapshot", zfsctl_mknode_snapdir, GFS_CACHE_VNODE },
157 { "shares", zfsctl_mknode_shares, GFS_CACHE_VNODE },
161 /* include . and .. in the calculation */
162 #define NROOT_ENTRIES ((sizeof (zfsctl_root_entries) / \
163 sizeof (gfs_dirent_t)) + 1)
167 * Initialize the various GFS pieces we'll need to create and manipulate .zfs
168 * directories. This is called from the ZFS init routine, and initializes the
169 * vnode ops vectors that we'll be using.
175 VERIFY(gfs_make_opsvec(zfsctl_opsvec) == 0);
184 * Remove vfsctl vnode ops
187 vn_freevnodeops(zfsctl_ops_root);
188 if (zfsctl_ops_snapdir)
189 vn_freevnodeops(zfsctl_ops_snapdir);
190 if (zfsctl_ops_snapshot)
191 vn_freevnodeops(zfsctl_ops_snapshot);
192 if (zfsctl_ops_shares)
193 vn_freevnodeops(zfsctl_ops_shares);
194 if (zfsctl_ops_shares_dir)
195 vn_freevnodeops(zfsctl_ops_shares_dir);
197 zfsctl_ops_root = NULL;
198 zfsctl_ops_snapdir = NULL;
199 zfsctl_ops_snapshot = NULL;
200 zfsctl_ops_shares = NULL;
201 zfsctl_ops_shares_dir = NULL;
206 zfsctl_is_node(vnode_t *vp)
208 return (vn_matchops(vp, zfsctl_ops_root) ||
209 vn_matchops(vp, zfsctl_ops_snapdir) ||
210 vn_matchops(vp, zfsctl_ops_snapshot) ||
211 vn_matchops(vp, zfsctl_ops_shares) ||
212 vn_matchops(vp, zfsctl_ops_shares_dir));
217 * Return the inode number associated with the 'snapshot' or
218 * 'shares' directory.
222 zfsctl_root_inode_cb(vnode_t *vp, int index)
224 zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data;
229 return (ZFSCTL_INO_SNAPDIR);
231 return (zfsvfs->z_shares_dir);
235 * Create the '.zfs' directory. This directory is cached as part of the VFS
236 * structure. This results in a hold on the vfs_t. The code in zfs_umount()
237 * therefore checks against a vfs_count of 2 instead of 1. This reference
238 * is removed when the ctldir is destroyed in the unmount.
241 zfsctl_create(zfsvfs_t *zfsvfs)
247 ASSERT(zfsvfs->z_ctldir == NULL);
249 vp = gfs_root_create(sizeof (zfsctl_node_t), zfsvfs->z_vfs,
250 &zfsctl_ops_root, ZFSCTL_INO_ROOT, zfsctl_root_entries,
251 zfsctl_root_inode_cb, MAXNAMELEN, NULL, NULL);
253 zcp->zc_id = ZFSCTL_INO_ROOT;
255 VERIFY(VFS_ROOT(zfsvfs->z_vfs, LK_EXCLUSIVE, &rvp) == 0);
256 VERIFY(0 == sa_lookup(VTOZ(rvp)->z_sa_hdl, SA_ZPL_CRTIME(zfsvfs),
257 &crtime, sizeof (crtime)));
258 ZFS_TIME_DECODE(&zcp->zc_cmtime, crtime);
262 * We're only faking the fact that we have a root of a filesystem for
263 * the sake of the GFS interfaces. Undo the flag manipulation it did
266 vp->v_vflag &= ~VV_ROOT;
268 zfsvfs->z_ctldir = vp;
274 * Destroy the '.zfs' directory. Only called when the filesystem is unmounted.
275 * There might still be more references if we were force unmounted, but only
276 * new zfs_inactive() calls can occur and they don't reference .zfs
279 zfsctl_destroy(zfsvfs_t *zfsvfs)
281 VN_RELE(zfsvfs->z_ctldir);
282 zfsvfs->z_ctldir = NULL;
286 * Given a root znode, retrieve the associated .zfs directory.
287 * Add a hold to the vnode and return it.
290 zfsctl_root(znode_t *zp)
292 ASSERT(zfs_has_ctldir(zp));
293 VN_HOLD(zp->z_zfsvfs->z_ctldir);
294 return (zp->z_zfsvfs->z_ctldir);
298 * Common open routine. Disallow any write access.
302 zfsctl_common_open(struct vop_open_args *ap)
304 int flags = ap->a_mode;
307 return (SET_ERROR(EACCES));
313 * Common close routine. Nothing to do here.
317 zfsctl_common_close(struct vop_close_args *ap)
323 * Common access routine. Disallow writes.
327 zfsctl_common_access(ap)
328 struct vop_access_args /* {
331 struct ucred *a_cred;
335 accmode_t accmode = ap->a_accmode;
338 if (flags & V_ACE_MASK) {
339 if (accmode & ACE_ALL_WRITE_PERMS)
340 return (SET_ERROR(EACCES));
343 if (accmode & VWRITE)
344 return (SET_ERROR(EACCES));
353 * Common getattr function. Fill in basic information.
356 zfsctl_common_getattr(vnode_t *vp, vattr_t *vap)
364 * We are a purely virtual object, so we have no
365 * blocksize or allocated blocks.
370 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
371 vap->va_mode = S_IRUSR | S_IXUSR | S_IRGRP | S_IXGRP |
375 * We live in the now (for atime).
379 /* FreeBSD: Reset chflags(2) flags. */
385 zfsctl_common_fid(ap)
386 struct vop_fid_args /* {
391 vnode_t *vp = ap->a_vp;
392 fid_t *fidp = (void *)ap->a_fid;
393 zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data;
394 zfsctl_node_t *zcp = vp->v_data;
395 uint64_t object = zcp->zc_id;
402 if (fidp->fid_len < SHORT_FID_LEN) {
403 fidp->fid_len = SHORT_FID_LEN;
405 return (SET_ERROR(ENOSPC));
408 fidp->fid_len = SHORT_FID_LEN;
411 zfid = (zfid_short_t *)fidp;
413 zfid->zf_len = SHORT_FID_LEN;
415 for (i = 0; i < sizeof (zfid->zf_object); i++)
416 zfid->zf_object[i] = (uint8_t)(object >> (8 * i));
418 /* .zfs znodes always have a generation number of 0 */
419 for (i = 0; i < sizeof (zfid->zf_gen); i++)
429 zfsctl_shares_fid(ap)
430 struct vop_fid_args /* {
435 vnode_t *vp = ap->a_vp;
436 fid_t *fidp = (void *)ap->a_fid;
437 zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data;
443 if (zfsvfs->z_shares_dir == 0) {
445 return (SET_ERROR(ENOTSUP));
448 if ((error = zfs_zget(zfsvfs, zfsvfs->z_shares_dir, &dzp)) == 0) {
449 error = VOP_FID(ZTOV(dzp), fidp);
458 zfsctl_common_reclaim(ap)
459 struct vop_reclaim_args /* {
464 vnode_t *vp = ap->a_vp;
467 * Destroy the vm object and flush associated pages.
469 vnode_destroy_vobject(vp);
477 * .zfs inode namespace
479 * We need to generate unique inode numbers for all files and directories
480 * within the .zfs pseudo-filesystem. We use the following scheme:
485 * .zfs/snapshot/<snap> objectid(snap)
488 #define ZFSCTL_INO_SNAP(id) (id)
491 * Get root directory attributes.
495 zfsctl_root_getattr(ap)
496 struct vop_getattr_args /* {
499 struct ucred *a_cred;
502 struct vnode *vp = ap->a_vp;
503 struct vattr *vap = ap->a_vap;
504 zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data;
505 zfsctl_node_t *zcp = vp->v_data;
508 vap->va_nodeid = ZFSCTL_INO_ROOT;
509 vap->va_nlink = vap->va_size = NROOT_ENTRIES;
510 vap->va_mtime = vap->va_ctime = zcp->zc_cmtime;
511 vap->va_birthtime = vap->va_ctime;
513 zfsctl_common_getattr(vp, vap);
520 * Special case the handling of "..".
524 zfsctl_root_lookup(vnode_t *dvp, char *nm, vnode_t **vpp, pathname_t *pnp,
525 int flags, vnode_t *rdir, cred_t *cr, caller_context_t *ct,
526 int *direntflags, pathname_t *realpnp)
528 zfsvfs_t *zfsvfs = dvp->v_vfsp->vfs_data;
532 * No extended attributes allowed under .zfs
534 if (flags & LOOKUP_XATTR)
535 return (SET_ERROR(EINVAL));
539 if (strcmp(nm, "..") == 0) {
540 err = VFS_ROOT(dvp->v_vfsp, LK_EXCLUSIVE, vpp);
544 err = gfs_vop_lookup(dvp, nm, vpp, pnp, flags, rdir,
545 cr, ct, direntflags, realpnp);
555 zfsctl_pathconf(vnode_t *vp, int cmd, ulong_t *valp, cred_t *cr,
556 caller_context_t *ct)
559 * We only care about ACL_ENABLED so that libsec can
560 * display ACL correctly and not default to POSIX draft.
562 if (cmd == _PC_ACL_ENABLED) {
563 *valp = _ACL_ACE_ENABLED;
567 return (fs_pathconf(vp, cmd, valp, cr, ct));
572 static const fs_operation_def_t zfsctl_tops_root[] = {
573 { VOPNAME_OPEN, { .vop_open = zfsctl_common_open } },
574 { VOPNAME_CLOSE, { .vop_close = zfsctl_common_close } },
575 { VOPNAME_IOCTL, { .error = fs_inval } },
576 { VOPNAME_GETATTR, { .vop_getattr = zfsctl_root_getattr } },
577 { VOPNAME_ACCESS, { .vop_access = zfsctl_common_access } },
578 { VOPNAME_READDIR, { .vop_readdir = gfs_vop_readdir } },
579 { VOPNAME_LOOKUP, { .vop_lookup = zfsctl_root_lookup } },
580 { VOPNAME_SEEK, { .vop_seek = fs_seek } },
581 { VOPNAME_INACTIVE, { .vop_inactive = gfs_vop_inactive } },
582 { VOPNAME_PATHCONF, { .vop_pathconf = zfsctl_pathconf } },
583 { VOPNAME_FID, { .vop_fid = zfsctl_common_fid } },
589 * Special case the handling of "..".
593 zfsctl_freebsd_root_lookup(ap)
594 struct vop_lookup_args /* {
596 struct vnode **a_vpp;
597 struct componentname *a_cnp;
600 vnode_t *dvp = ap->a_dvp;
601 vnode_t **vpp = ap->a_vpp;
602 cred_t *cr = ap->a_cnp->cn_cred;
603 int flags = ap->a_cnp->cn_flags;
604 int nameiop = ap->a_cnp->cn_nameiop;
605 char nm[NAME_MAX + 1];
609 if ((flags & ISLASTCN) && (nameiop == RENAME || nameiop == CREATE))
612 ASSERT(ap->a_cnp->cn_namelen < sizeof(nm));
613 strlcpy(nm, ap->a_cnp->cn_nameptr, ap->a_cnp->cn_namelen + 1);
614 err = zfsctl_root_lookup(dvp, nm, vpp, NULL, 0, NULL, cr, NULL, NULL, NULL);
615 if (err == 0 && (nm[0] != '.' || nm[1] != '\0')) {
616 ltype = VOP_ISLOCKED(dvp);
617 if (flags & ISDOTDOT) {
621 vn_lock(*vpp, LK_EXCLUSIVE | LK_RETRY);
622 if (flags & ISDOTDOT) {
624 vn_lock(dvp, ltype| LK_RETRY);
631 static struct vop_vector zfsctl_ops_root = {
632 .vop_default = &default_vnodeops,
633 .vop_open = zfsctl_common_open,
634 .vop_close = zfsctl_common_close,
635 .vop_ioctl = VOP_EINVAL,
636 .vop_getattr = zfsctl_root_getattr,
637 .vop_access = zfsctl_common_access,
638 .vop_readdir = gfs_vop_readdir,
639 .vop_lookup = zfsctl_freebsd_root_lookup,
640 .vop_inactive = VOP_NULL,
641 .vop_reclaim = gfs_vop_reclaim,
643 .vop_pathconf = zfsctl_pathconf,
645 .vop_fid = zfsctl_common_fid,
649 * Gets the full dataset name that corresponds to the given snapshot name
651 * zfsctl_snapshot_zname("snap1") -> "mypool/myfs@snap1"
654 zfsctl_snapshot_zname(vnode_t *vp, const char *name, int len, char *zname)
656 objset_t *os = ((zfsvfs_t *)((vp)->v_vfsp->vfs_data))->z_os;
658 if (zfs_component_namecheck(name, NULL, NULL) != 0)
659 return (SET_ERROR(EILSEQ));
660 dmu_objset_name(os, zname);
661 if (strlen(zname) + 1 + strlen(name) >= len)
662 return (SET_ERROR(ENAMETOOLONG));
663 (void) strcat(zname, "@");
664 (void) strcat(zname, name);
669 zfsctl_unmount_snap(zfs_snapentry_t *sep, int fflags, cred_t *cr)
671 vnode_t *svp = sep->se_root;
674 ASSERT(vn_ismntpt(svp));
676 /* this will be dropped by dounmount() */
677 if ((error = vn_vfswlock(svp)) != 0)
682 error = dounmount(vn_mountedvfs(svp), fflags, cr);
689 * We can't use VN_RELE(), as that will try to invoke
690 * zfsctl_snapdir_inactive(), which would cause us to destroy
691 * the sd_lock mutex held by our caller.
693 ASSERT(svp->v_count == 1);
694 gfs_vop_reclaim(svp, cr, NULL);
696 kmem_free(sep->se_name, strlen(sep->se_name) + 1);
697 kmem_free(sep, sizeof (zfs_snapentry_t));
701 vfs_ref(vn_mountedvfs(svp));
702 return (dounmount(vn_mountedvfs(svp), fflags, curthread));
708 zfsctl_rename_snap(zfsctl_snapdir_t *sdp, zfs_snapentry_t *sep, const char *nm)
713 char newpath[MAXNAMELEN];
716 ASSERT(MUTEX_HELD(&sdp->sd_lock));
719 vfsp = vn_mountedvfs(sep->se_root);
720 ASSERT(vfsp != NULL);
725 * Change the name in the AVL tree.
727 avl_remove(&sdp->sd_snaps, sep);
728 kmem_free(sep->se_name, strlen(sep->se_name) + 1);
729 sep->se_name = kmem_alloc(strlen(nm) + 1, KM_SLEEP);
730 (void) strcpy(sep->se_name, nm);
731 VERIFY(avl_find(&sdp->sd_snaps, sep, &where) == NULL);
732 avl_insert(&sdp->sd_snaps, sep, where);
735 * Change the current mountpoint info:
736 * - update the tail of the mntpoint path
737 * - update the tail of the resource path
739 pathref = vfs_getmntpoint(vfsp);
740 (void) strncpy(newpath, refstr_value(pathref), sizeof (newpath));
741 VERIFY((tail = strrchr(newpath, '/')) != NULL);
743 ASSERT3U(strlen(newpath) + strlen(nm), <, sizeof (newpath));
744 (void) strcat(newpath, nm);
745 refstr_rele(pathref);
746 vfs_setmntpoint(vfsp, newpath, 0);
748 pathref = vfs_getresource(vfsp);
749 (void) strncpy(newpath, refstr_value(pathref), sizeof (newpath));
750 VERIFY((tail = strrchr(newpath, '@')) != NULL);
752 ASSERT3U(strlen(newpath) + strlen(nm), <, sizeof (newpath));
753 (void) strcat(newpath, nm);
754 refstr_rele(pathref);
755 vfs_setresource(vfsp, newpath, 0);
764 zfsctl_snapdir_rename(vnode_t *sdvp, char *snm, vnode_t *tdvp, char *tnm,
765 cred_t *cr, caller_context_t *ct, int flags)
767 zfsctl_snapdir_t *sdp = sdvp->v_data;
768 zfs_snapentry_t search, *sep;
771 char from[MAXNAMELEN], to[MAXNAMELEN];
772 char real[MAXNAMELEN], fsname[MAXNAMELEN];
775 zfsvfs = sdvp->v_vfsp->vfs_data;
778 if ((flags & FIGNORECASE) || zfsvfs->z_case == ZFS_CASE_INSENSITIVE) {
779 err = dmu_snapshot_realname(zfsvfs->z_os, snm, real,
783 } else if (err != ENOTSUP) {
791 dmu_objset_name(zfsvfs->z_os, fsname);
793 err = zfsctl_snapshot_zname(sdvp, snm, MAXNAMELEN, from);
795 err = zfsctl_snapshot_zname(tdvp, tnm, MAXNAMELEN, to);
797 err = zfs_secpolicy_rename_perms(from, to, cr);
802 * Cannot move snapshots out of the snapdir.
805 return (SET_ERROR(EINVAL));
807 if (strcmp(snm, tnm) == 0)
810 mutex_enter(&sdp->sd_lock);
812 search.se_name = (char *)snm;
813 if ((sep = avl_find(&sdp->sd_snaps, &search, &where)) == NULL) {
814 mutex_exit(&sdp->sd_lock);
815 return (SET_ERROR(ENOENT));
818 err = dsl_dataset_rename_snapshot(fsname, snm, tnm, 0);
820 zfsctl_rename_snap(sdp, sep, tnm);
822 mutex_exit(&sdp->sd_lock);
831 zfsctl_snapdir_remove(vnode_t *dvp, char *name, vnode_t *cwd, cred_t *cr,
832 caller_context_t *ct, int flags)
834 zfsctl_snapdir_t *sdp = dvp->v_data;
835 zfs_snapentry_t *sep;
836 zfs_snapentry_t search;
838 char snapname[MAXNAMELEN];
839 char real[MAXNAMELEN];
842 zfsvfs = dvp->v_vfsp->vfs_data;
845 if ((flags & FIGNORECASE) || zfsvfs->z_case == ZFS_CASE_INSENSITIVE) {
847 err = dmu_snapshot_realname(zfsvfs->z_os, name, real,
851 } else if (err != ENOTSUP) {
859 err = zfsctl_snapshot_zname(dvp, name, MAXNAMELEN, snapname);
861 err = zfs_secpolicy_destroy_perms(snapname, cr);
865 mutex_enter(&sdp->sd_lock);
867 search.se_name = name;
868 sep = avl_find(&sdp->sd_snaps, &search, NULL);
870 avl_remove(&sdp->sd_snaps, sep);
871 err = zfsctl_unmount_snap(sep, MS_FORCE, cr);
873 avl_add(&sdp->sd_snaps, sep);
875 err = dsl_destroy_snapshot(snapname, B_FALSE);
877 err = SET_ERROR(ENOENT);
880 mutex_exit(&sdp->sd_lock);
887 * This creates a snapshot under '.zfs/snapshot'.
891 zfsctl_snapdir_mkdir(vnode_t *dvp, char *dirname, vattr_t *vap, vnode_t **vpp,
892 cred_t *cr, caller_context_t *cc, int flags, vsecattr_t *vsecp)
894 zfsvfs_t *zfsvfs = dvp->v_vfsp->vfs_data;
895 char name[MAXNAMELEN];
897 static enum symfollow follow = NO_FOLLOW;
898 static enum uio_seg seg = UIO_SYSSPACE;
900 if (zfs_component_namecheck(dirname, NULL, NULL) != 0)
901 return (SET_ERROR(EILSEQ));
903 dmu_objset_name(zfsvfs->z_os, name);
907 err = zfs_secpolicy_snapshot_perms(name, cr);
912 err = dmu_objset_snapshot_one(name, dirname);
915 err = lookupnameat(dirname, seg, follow, NULL, vpp, dvp);
922 zfsctl_freebsd_snapdir_mkdir(ap)
923 struct vop_mkdir_args /* {
925 struct vnode **a_vpp;
926 struct componentname *a_cnp;
931 ASSERT(ap->a_cnp->cn_flags & SAVENAME);
933 return (zfsctl_snapdir_mkdir(ap->a_dvp, ap->a_cnp->cn_nameptr, NULL,
934 ap->a_vpp, ap->a_cnp->cn_cred, NULL, 0, NULL));
938 * Lookup entry point for the 'snapshot' directory. Try to open the
939 * snapshot if it exist, creating the pseudo filesystem vnode as necessary.
940 * Perform a mount of the associated dataset on top of the vnode.
944 zfsctl_snapdir_lookup(ap)
945 struct vop_lookup_args /* {
947 struct vnode **a_vpp;
948 struct componentname *a_cnp;
951 vnode_t *dvp = ap->a_dvp;
952 vnode_t **vpp = ap->a_vpp;
953 struct componentname *cnp = ap->a_cnp;
954 char nm[NAME_MAX + 1];
955 zfsctl_snapdir_t *sdp = dvp->v_data;
957 char snapname[MAXNAMELEN];
958 char real[MAXNAMELEN];
960 zfs_snapentry_t *sep, search;
961 size_t mountpoint_len;
963 zfsvfs_t *zfsvfs = dvp->v_vfsp->vfs_data;
965 int ltype, flags = 0;
968 * No extended attributes allowed under .zfs
970 if (flags & LOOKUP_XATTR)
971 return (SET_ERROR(EINVAL));
972 ASSERT(ap->a_cnp->cn_namelen < sizeof(nm));
973 strlcpy(nm, ap->a_cnp->cn_nameptr, ap->a_cnp->cn_namelen + 1);
975 ASSERT(dvp->v_type == VDIR);
980 * If we get a recursive call, that means we got called
981 * from the domount() code while it was trying to look up the
982 * spec (which looks like a local path for zfs). We need to
983 * add some flag to domount() to tell it not to do this lookup.
985 if (MUTEX_HELD(&sdp->sd_lock))
986 return (SET_ERROR(ENOENT));
989 if (gfs_lookup_dot(vpp, dvp, zfsvfs->z_ctldir, nm) == 0) {
994 if (flags & FIGNORECASE) {
995 boolean_t conflict = B_FALSE;
997 err = dmu_snapshot_realname(zfsvfs->z_os, nm, real,
998 MAXNAMELEN, &conflict);
1000 strlcpy(nm, real, sizeof(nm));
1001 } else if (err != ENOTSUP) {
1007 (void) strlcpy(realpnp->pn_buf, nm,
1008 realpnp->pn_bufsize);
1009 if (conflict && direntflags)
1010 *direntflags = ED_CASE_CONFLICT;
1014 mutex_enter(&sdp->sd_lock);
1015 search.se_name = (char *)nm;
1016 if ((sep = avl_find(&sdp->sd_snaps, &search, &where)) != NULL) {
1017 *vpp = sep->se_root;
1019 err = traverse(vpp, LK_EXCLUSIVE | LK_RETRY);
1023 } else if (*vpp == sep->se_root) {
1025 * The snapshot was unmounted behind our backs,
1026 * try to remount it.
1028 VERIFY(zfsctl_snapshot_zname(dvp, nm, MAXNAMELEN, snapname) == 0);
1032 * VROOT was set during the traverse call. We need
1033 * to clear it since we're pretending to be part
1034 * of our parent's vfs.
1036 (*vpp)->v_flag &= ~VROOT;
1038 mutex_exit(&sdp->sd_lock);
1044 * The requested snapshot is not currently mounted, look it up.
1046 err = zfsctl_snapshot_zname(dvp, nm, MAXNAMELEN, snapname);
1048 mutex_exit(&sdp->sd_lock);
1051 * handle "ls *" or "?" in a graceful manner,
1052 * forcing EILSEQ to ENOENT.
1053 * Since shell ultimately passes "*" or "?" as name to lookup
1055 return (err == EILSEQ ? ENOENT : err);
1057 if (dmu_objset_hold(snapname, FTAG, &snap) != 0) {
1058 mutex_exit(&sdp->sd_lock);
1061 return (SET_ERROR(ENOENT));
1062 #else /* !illumos */
1063 /* Translate errors and add SAVENAME when needed. */
1064 if ((cnp->cn_flags & ISLASTCN) && cnp->cn_nameiop == CREATE) {
1066 cnp->cn_flags |= SAVENAME;
1068 err = SET_ERROR(ENOENT);
1072 #endif /* !illumos */
1075 sep = kmem_alloc(sizeof (zfs_snapentry_t), KM_SLEEP);
1076 sep->se_name = kmem_alloc(strlen(nm) + 1, KM_SLEEP);
1077 (void) strcpy(sep->se_name, nm);
1078 *vpp = sep->se_root = zfsctl_snapshot_mknode(dvp, dmu_objset_id(snap));
1080 avl_insert(&sdp->sd_snaps, sep, where);
1082 dmu_objset_rele(snap, FTAG);
1084 mountpoint_len = strlen(dvp->v_vfsp->mnt_stat.f_mntonname) +
1085 strlen("/" ZFS_CTLDIR_NAME "/snapshot/") + strlen(nm) + 1;
1086 mountpoint = kmem_alloc(mountpoint_len, KM_SLEEP);
1087 (void) snprintf(mountpoint, mountpoint_len,
1088 "%s/" ZFS_CTLDIR_NAME "/snapshot/%s",
1089 dvp->v_vfsp->mnt_stat.f_mntonname, nm);
1090 err = mount_snapshot(curthread, vpp, "zfs", mountpoint, snapname, 0);
1091 kmem_free(mountpoint, mountpoint_len);
1094 * Fix up the root vnode mounted on .zfs/snapshot/<snapname>.
1096 * This is where we lie about our v_vfsp in order to
1097 * make .zfs/snapshot/<snapname> accessible over NFS
1098 * without requiring manual mounts of <snapname>.
1100 ASSERT(VTOZ(*vpp)->z_zfsvfs != zfsvfs);
1101 VTOZ(*vpp)->z_zfsvfs->z_parent = zfsvfs;
1103 mutex_exit(&sdp->sd_lock);
1108 * If we had an error, drop our hold on the vnode and
1109 * zfsctl_snapshot_inactive() will clean up.
1124 zfsctl_shares_lookup(ap)
1125 struct vop_lookup_args /* {
1126 struct vnode *a_dvp;
1127 struct vnode **a_vpp;
1128 struct componentname *a_cnp;
1131 vnode_t *dvp = ap->a_dvp;
1132 vnode_t **vpp = ap->a_vpp;
1133 struct componentname *cnp = ap->a_cnp;
1134 zfsvfs_t *zfsvfs = dvp->v_vfsp->vfs_data;
1135 char nm[NAME_MAX + 1];
1141 ASSERT(cnp->cn_namelen < sizeof(nm));
1142 strlcpy(nm, cnp->cn_nameptr, cnp->cn_namelen + 1);
1144 if (gfs_lookup_dot(vpp, dvp, zfsvfs->z_ctldir, nm) == 0) {
1149 if (zfsvfs->z_shares_dir == 0) {
1151 return (SET_ERROR(ENOTSUP));
1153 if ((error = zfs_zget(zfsvfs, zfsvfs->z_shares_dir, &dzp)) == 0) {
1154 error = VOP_LOOKUP(ZTOV(dzp), vpp, cnp);
1165 zfsctl_snapdir_readdir_cb(vnode_t *vp, void *dp, int *eofp,
1166 offset_t *offp, offset_t *nextp, void *data, int flags)
1168 zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data;
1169 char snapname[MAXNAMELEN];
1170 uint64_t id, cookie;
1171 boolean_t case_conflict;
1177 dsl_pool_config_enter(dmu_objset_pool(zfsvfs->z_os), FTAG);
1178 error = dmu_snapshot_list_next(zfsvfs->z_os, MAXNAMELEN, snapname, &id,
1179 &cookie, &case_conflict);
1180 dsl_pool_config_exit(dmu_objset_pool(zfsvfs->z_os), FTAG);
1183 if (error == ENOENT) {
1190 if (flags & V_RDDIR_ENTFLAGS) {
1191 edirent_t *eodp = dp;
1193 (void) strcpy(eodp->ed_name, snapname);
1194 eodp->ed_ino = ZFSCTL_INO_SNAP(id);
1195 eodp->ed_eflags = case_conflict ? ED_CASE_CONFLICT : 0;
1197 struct dirent64 *odp = dp;
1199 (void) strcpy(odp->d_name, snapname);
1200 odp->d_ino = ZFSCTL_INO_SNAP(id);
1211 zfsctl_shares_readdir(ap)
1212 struct vop_readdir_args /* {
1215 struct ucred *a_cred;
1221 vnode_t *vp = ap->a_vp;
1222 uio_t *uiop = ap->a_uio;
1223 cred_t *cr = ap->a_cred;
1224 int *eofp = ap->a_eofflag;
1225 zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data;
1231 if (zfsvfs->z_shares_dir == 0) {
1233 return (SET_ERROR(ENOTSUP));
1235 if ((error = zfs_zget(zfsvfs, zfsvfs->z_shares_dir, &dzp)) == 0) {
1236 vn_lock(ZTOV(dzp), LK_SHARED | LK_RETRY);
1237 error = VOP_READDIR(ZTOV(dzp), uiop, cr, eofp, ap->a_ncookies, ap->a_cookies);
1238 VN_URELE(ZTOV(dzp));
1241 error = SET_ERROR(ENOENT);
1249 * pvp is the '.zfs' directory (zfsctl_node_t).
1251 * Creates vp, which is '.zfs/snapshot' (zfsctl_snapdir_t).
1253 * This function is the callback to create a GFS vnode for '.zfs/snapshot'
1254 * when a lookup is performed on .zfs for "snapshot".
1257 zfsctl_mknode_snapdir(vnode_t *pvp)
1260 zfsctl_snapdir_t *sdp;
1262 vp = gfs_dir_create(sizeof (zfsctl_snapdir_t), pvp, pvp->v_vfsp,
1263 &zfsctl_ops_snapdir, NULL, NULL, MAXNAMELEN,
1264 zfsctl_snapdir_readdir_cb, NULL);
1266 sdp->sd_node.zc_id = ZFSCTL_INO_SNAPDIR;
1267 sdp->sd_node.zc_cmtime = ((zfsctl_node_t *)pvp->v_data)->zc_cmtime;
1268 mutex_init(&sdp->sd_lock, NULL, MUTEX_DEFAULT, NULL);
1269 avl_create(&sdp->sd_snaps, snapentry_compare,
1270 sizeof (zfs_snapentry_t), offsetof(zfs_snapentry_t, se_node));
1276 zfsctl_mknode_shares(vnode_t *pvp)
1281 vp = gfs_dir_create(sizeof (zfsctl_node_t), pvp, pvp->v_vfsp,
1282 &zfsctl_ops_shares, NULL, NULL, MAXNAMELEN,
1285 sdp->zc_cmtime = ((zfsctl_node_t *)pvp->v_data)->zc_cmtime;
1293 zfsctl_shares_getattr(ap)
1294 struct vop_getattr_args /* {
1296 struct vattr *a_vap;
1297 struct ucred *a_cred;
1298 struct thread *a_td;
1301 vnode_t *vp = ap->a_vp;
1302 vattr_t *vap = ap->a_vap;
1303 cred_t *cr = ap->a_cred;
1304 zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data;
1309 if (zfsvfs->z_shares_dir == 0) {
1311 return (SET_ERROR(ENOTSUP));
1313 if ((error = zfs_zget(zfsvfs, zfsvfs->z_shares_dir, &dzp)) == 0) {
1314 vn_lock(ZTOV(dzp), LK_SHARED | LK_RETRY);
1315 error = VOP_GETATTR(ZTOV(dzp), vap, cr);
1316 VN_URELE(ZTOV(dzp));
1326 zfsctl_snapdir_getattr(ap)
1327 struct vop_getattr_args /* {
1329 struct vattr *a_vap;
1330 struct ucred *a_cred;
1333 vnode_t *vp = ap->a_vp;
1334 vattr_t *vap = ap->a_vap;
1335 zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data;
1336 zfsctl_snapdir_t *sdp = vp->v_data;
1339 zfsctl_common_getattr(vp, vap);
1340 vap->va_nodeid = gfs_file_inode(vp);
1341 vap->va_nlink = vap->va_size = avl_numnodes(&sdp->sd_snaps) + 2;
1342 vap->va_ctime = vap->va_mtime = dmu_objset_snap_cmtime(zfsvfs->z_os);
1343 vap->va_birthtime = vap->va_ctime;
1351 zfsctl_snapdir_inactive(ap)
1352 struct vop_inactive_args /* {
1354 struct thread *a_td;
1357 vnode_t *vp = ap->a_vp;
1358 zfsctl_snapdir_t *sdp = vp->v_data;
1359 zfs_snapentry_t *sep;
1362 * On forced unmount we have to free snapshots from here.
1364 mutex_enter(&sdp->sd_lock);
1365 while ((sep = avl_first(&sdp->sd_snaps)) != NULL) {
1366 avl_remove(&sdp->sd_snaps, sep);
1367 kmem_free(sep->se_name, strlen(sep->se_name) + 1);
1368 kmem_free(sep, sizeof (zfs_snapentry_t));
1370 mutex_exit(&sdp->sd_lock);
1371 gfs_dir_inactive(vp);
1372 ASSERT(avl_numnodes(&sdp->sd_snaps) == 0);
1373 mutex_destroy(&sdp->sd_lock);
1374 avl_destroy(&sdp->sd_snaps);
1375 kmem_free(sdp, sizeof (zfsctl_snapdir_t));
1381 static const fs_operation_def_t zfsctl_tops_snapdir[] = {
1382 { VOPNAME_OPEN, { .vop_open = zfsctl_common_open } },
1383 { VOPNAME_CLOSE, { .vop_close = zfsctl_common_close } },
1384 { VOPNAME_IOCTL, { .error = fs_inval } },
1385 { VOPNAME_GETATTR, { .vop_getattr = zfsctl_snapdir_getattr } },
1386 { VOPNAME_ACCESS, { .vop_access = zfsctl_common_access } },
1387 { VOPNAME_RENAME, { .vop_rename = zfsctl_snapdir_rename } },
1388 { VOPNAME_RMDIR, { .vop_rmdir = zfsctl_snapdir_remove } },
1389 { VOPNAME_MKDIR, { .vop_mkdir = zfsctl_snapdir_mkdir } },
1390 { VOPNAME_READDIR, { .vop_readdir = gfs_vop_readdir } },
1391 { VOPNAME_LOOKUP, { .vop_lookup = zfsctl_snapdir_lookup } },
1392 { VOPNAME_SEEK, { .vop_seek = fs_seek } },
1393 { VOPNAME_INACTIVE, { .vop_inactive = zfsctl_snapdir_inactive } },
1394 { VOPNAME_FID, { .vop_fid = zfsctl_common_fid } },
1398 static const fs_operation_def_t zfsctl_tops_shares[] = {
1399 { VOPNAME_OPEN, { .vop_open = zfsctl_common_open } },
1400 { VOPNAME_CLOSE, { .vop_close = zfsctl_common_close } },
1401 { VOPNAME_IOCTL, { .error = fs_inval } },
1402 { VOPNAME_GETATTR, { .vop_getattr = zfsctl_shares_getattr } },
1403 { VOPNAME_ACCESS, { .vop_access = zfsctl_common_access } },
1404 { VOPNAME_READDIR, { .vop_readdir = zfsctl_shares_readdir } },
1405 { VOPNAME_LOOKUP, { .vop_lookup = zfsctl_shares_lookup } },
1406 { VOPNAME_SEEK, { .vop_seek = fs_seek } },
1407 { VOPNAME_INACTIVE, { .vop_inactive = gfs_vop_inactive } },
1408 { VOPNAME_FID, { .vop_fid = zfsctl_shares_fid } },
1412 static struct vop_vector zfsctl_ops_snapdir = {
1413 .vop_default = &default_vnodeops,
1414 .vop_open = zfsctl_common_open,
1415 .vop_close = zfsctl_common_close,
1416 .vop_ioctl = VOP_EINVAL,
1417 .vop_getattr = zfsctl_snapdir_getattr,
1418 .vop_access = zfsctl_common_access,
1419 .vop_mkdir = zfsctl_freebsd_snapdir_mkdir,
1420 .vop_readdir = gfs_vop_readdir,
1421 .vop_lookup = zfsctl_snapdir_lookup,
1422 .vop_inactive = zfsctl_snapdir_inactive,
1423 .vop_reclaim = zfsctl_common_reclaim,
1424 .vop_fid = zfsctl_common_fid,
1427 static struct vop_vector zfsctl_ops_shares = {
1428 .vop_default = &default_vnodeops,
1429 .vop_open = zfsctl_common_open,
1430 .vop_close = zfsctl_common_close,
1431 .vop_ioctl = VOP_EINVAL,
1432 .vop_getattr = zfsctl_shares_getattr,
1433 .vop_access = zfsctl_common_access,
1434 .vop_readdir = zfsctl_shares_readdir,
1435 .vop_lookup = zfsctl_shares_lookup,
1436 .vop_inactive = VOP_NULL,
1437 .vop_reclaim = gfs_vop_reclaim,
1438 .vop_fid = zfsctl_shares_fid,
1443 * pvp is the GFS vnode '.zfs/snapshot'.
1445 * This creates a GFS node under '.zfs/snapshot' representing each
1446 * snapshot. This newly created GFS node is what we mount snapshot
1450 zfsctl_snapshot_mknode(vnode_t *pvp, uint64_t objset)
1455 vp = gfs_dir_create(sizeof (zfsctl_node_t), pvp, pvp->v_vfsp,
1456 &zfsctl_ops_snapshot, NULL, NULL, MAXNAMELEN, NULL, NULL);
1459 zcp->zc_id = objset;
1467 zfsctl_snapshot_reclaim(ap)
1468 struct vop_inactive_args /* {
1470 struct thread *a_td;
1473 vnode_t *vp = ap->a_vp;
1474 cred_t *cr = ap->a_td->td_ucred;
1475 struct vop_reclaim_args iap;
1476 zfsctl_snapdir_t *sdp;
1477 zfs_snapentry_t *sep, *next;
1481 VERIFY(gfs_dir_lookup(vp, "..", &dvp, cr, 0, NULL, NULL) == 0);
1484 /* this may already have been unmounted */
1489 if (!(locked = MUTEX_HELD(&sdp->sd_lock)))
1490 mutex_enter(&sdp->sd_lock);
1492 ASSERT(!vn_ismntpt(vp));
1494 sep = avl_first(&sdp->sd_snaps);
1495 while (sep != NULL) {
1496 next = AVL_NEXT(&sdp->sd_snaps, sep);
1498 if (sep->se_root == vp) {
1499 avl_remove(&sdp->sd_snaps, sep);
1500 kmem_free(sep->se_name, strlen(sep->se_name) + 1);
1501 kmem_free(sep, sizeof (zfs_snapentry_t));
1506 ASSERT(sep != NULL);
1509 mutex_exit(&sdp->sd_lock);
1513 * Dispose of the vnode for the snapshot mount point.
1514 * This is safe to do because once this entry has been removed
1515 * from the AVL tree, it can't be found again, so cannot become
1516 * "active". If we lookup the same name again we will end up
1517 * creating a new vnode.
1520 gfs_vop_reclaim(&iap);
1526 zfsctl_traverse_begin(vnode_t **vpp, int lktype)
1530 /* Snapshot should be already mounted, but just in case. */
1531 if (vn_mountedvfs(*vpp) == NULL)
1533 return (traverse(vpp, lktype));
1537 zfsctl_traverse_end(vnode_t *vp, int err)
1547 zfsctl_snapshot_getattr(ap)
1548 struct vop_getattr_args /* {
1550 struct vattr *a_vap;
1551 struct ucred *a_cred;
1554 vnode_t *vp = ap->a_vp;
1557 err = zfsctl_traverse_begin(&vp, LK_SHARED | LK_RETRY);
1559 err = VOP_GETATTR(vp, ap->a_vap, ap->a_cred);
1560 zfsctl_traverse_end(vp, err);
1565 zfsctl_snapshot_fid(ap)
1566 struct vop_fid_args /* {
1571 vnode_t *vp = ap->a_vp;
1574 err = zfsctl_traverse_begin(&vp, LK_SHARED | LK_RETRY);
1576 err = VOP_VPTOFH(vp, (void *)ap->a_fid);
1577 zfsctl_traverse_end(vp, err);
1582 zfsctl_snapshot_lookup(ap)
1583 struct vop_lookup_args /* {
1584 struct vnode *a_dvp;
1585 struct vnode **a_vpp;
1586 struct componentname *a_cnp;
1589 vnode_t *dvp = ap->a_dvp;
1590 vnode_t **vpp = ap->a_vpp;
1591 struct componentname *cnp = ap->a_cnp;
1592 cred_t *cr = ap->a_cnp->cn_cred;
1593 zfsvfs_t *zfsvfs = dvp->v_vfsp->vfs_data;
1596 if (cnp->cn_namelen != 2 || cnp->cn_nameptr[0] != '.' ||
1597 cnp->cn_nameptr[1] != '.') {
1601 ASSERT(dvp->v_type == VDIR);
1602 ASSERT(zfsvfs->z_ctldir != NULL);
1604 error = zfsctl_root_lookup(zfsvfs->z_ctldir, "snapshot", vpp,
1605 NULL, 0, NULL, cr, NULL, NULL, NULL);
1607 int ltype = VOP_ISLOCKED(dvp);
1610 vn_lock(*vpp, LK_EXCLUSIVE | LK_RETRY);
1612 vn_lock(dvp, ltype | LK_RETRY);
1619 zfsctl_snapshot_vptocnp(struct vop_vptocnp_args *ap)
1621 zfsvfs_t *zfsvfs = ap->a_vp->v_vfsp->vfs_data;
1623 zfsctl_snapdir_t *sdp;
1624 zfs_snapentry_t *sep;
1627 ASSERT(zfsvfs->z_ctldir != NULL);
1628 error = zfsctl_root_lookup(zfsvfs->z_ctldir, "snapshot", &dvp,
1629 NULL, 0, NULL, kcred, NULL, NULL, NULL);
1634 mutex_enter(&sdp->sd_lock);
1635 sep = avl_first(&sdp->sd_snaps);
1636 while (sep != NULL) {
1640 sep = AVL_NEXT(&sdp->sd_snaps, sep);
1643 mutex_exit(&sdp->sd_lock);
1648 len = strlen(sep->se_name);
1649 *ap->a_buflen -= len;
1650 bcopy(sep->se_name, ap->a_buf + *ap->a_buflen, len);
1651 mutex_exit(&sdp->sd_lock);
1661 * These VP's should never see the light of day. They should always
1664 static struct vop_vector zfsctl_ops_snapshot = {
1665 .vop_default = &default_vnodeops,
1666 .vop_inactive = VOP_NULL,
1667 .vop_lookup = zfsctl_snapshot_lookup,
1668 .vop_reclaim = zfsctl_snapshot_reclaim,
1669 .vop_getattr = zfsctl_snapshot_getattr,
1670 .vop_fid = zfsctl_snapshot_fid,
1671 .vop_vptocnp = zfsctl_snapshot_vptocnp,
1675 zfsctl_lookup_objset(vfs_t *vfsp, uint64_t objsetid, zfsvfs_t **zfsvfsp)
1677 zfsvfs_t *zfsvfs = vfsp->vfs_data;
1679 zfsctl_snapdir_t *sdp;
1681 zfs_snapentry_t *sep;
1684 ASSERT(zfsvfs->z_ctldir != NULL);
1685 error = zfsctl_root_lookup(zfsvfs->z_ctldir, "snapshot", &dvp,
1686 NULL, 0, NULL, kcred, NULL, NULL, NULL);
1691 mutex_enter(&sdp->sd_lock);
1692 sep = avl_first(&sdp->sd_snaps);
1693 while (sep != NULL) {
1696 if (zcp->zc_id == objsetid)
1699 sep = AVL_NEXT(&sdp->sd_snaps, sep);
1705 * Return the mounted root rather than the covered mount point.
1706 * Takes the GFS vnode at .zfs/snapshot/<snapshot objsetid>
1707 * and returns the ZFS vnode mounted on top of the GFS node.
1708 * This ZFS vnode is the root of the vfs for objset 'objsetid'.
1710 error = traverse(&vp, LK_SHARED | LK_RETRY);
1712 if (vp == sep->se_root)
1713 error = SET_ERROR(EINVAL);
1715 *zfsvfsp = VTOZ(vp)->z_zfsvfs;
1717 mutex_exit(&sdp->sd_lock);
1723 error = SET_ERROR(EINVAL);
1724 mutex_exit(&sdp->sd_lock);
1733 * Unmount any snapshots for the given filesystem. This is called from
1734 * zfs_umount() - if we have a ctldir, then go through and unmount all the
1738 zfsctl_umount_snapshots(vfs_t *vfsp, int fflags, cred_t *cr)
1740 zfsvfs_t *zfsvfs = vfsp->vfs_data;
1742 zfsctl_snapdir_t *sdp;
1743 zfs_snapentry_t *sep, *next;
1746 ASSERT(zfsvfs->z_ctldir != NULL);
1747 error = zfsctl_root_lookup(zfsvfs->z_ctldir, "snapshot", &dvp,
1748 NULL, 0, NULL, cr, NULL, NULL, NULL);
1753 mutex_enter(&sdp->sd_lock);
1755 sep = avl_first(&sdp->sd_snaps);
1756 while (sep != NULL) {
1757 next = AVL_NEXT(&sdp->sd_snaps, sep);
1760 * If this snapshot is not mounted, then it must
1761 * have just been unmounted by somebody else, and
1762 * will be cleaned up by zfsctl_snapdir_inactive().
1764 if (vn_ismntpt(sep->se_root)) {
1765 error = zfsctl_unmount_snap(sep, fflags, cr);
1770 * Before reinserting snapshot to the tree,
1771 * check if it was actually removed. For example
1772 * when snapshot mount point is busy, we will
1773 * have an error here, but there will be no need
1774 * to reinsert snapshot.
1776 if (avl_find(&sdp->sd_snaps, sep, &where) == NULL)
1777 avl_insert(&sdp->sd_snaps, sep, where);
1784 mutex_exit(&sdp->sd_lock);