1336 lines
33 KiB
C
1336 lines
33 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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/*
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* ZFS control directory (a.k.a. ".zfs")
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*
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* This directory provides a common location for all ZFS meta-objects.
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* Currently, this is only the 'snapshot' directory, but this may expand in the
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* future. The elements are built using the GFS primitives, as the hierarchy
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* does not actually exist on disk.
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*
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* For 'snapshot', we don't want to have all snapshots always mounted, because
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* this would take up a huge amount of space in /etc/mnttab. We have three
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* types of objects:
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*
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* ctldir ------> snapshotdir -------> snapshot
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* |
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* |
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* V
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* mounted fs
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*
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* The 'snapshot' node contains just enough information to lookup '..' and act
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* as a mountpoint for the snapshot. Whenever we lookup a specific snapshot, we
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* perform an automount of the underlying filesystem and return the
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* corresponding vnode.
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*
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* All mounts are handled automatically by the kernel, but unmounts are
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* (currently) handled from user land. The main reason is that there is no
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* reliable way to auto-unmount the filesystem when it's "no longer in use".
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* When the user unmounts a filesystem, we call zfsctl_unmount(), which
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* unmounts any snapshots within the snapshot directory.
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*
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* The '.zfs', '.zfs/snapshot', and all directories created under
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* '.zfs/snapshot' (ie: '.zfs/snapshot/<snapname>') are all GFS nodes and
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* share the same vfs_t as the head filesystem (what '.zfs' lives under).
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*
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* File systems mounted ontop of the GFS nodes '.zfs/snapshot/<snapname>'
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* (ie: snapshots) are ZFS nodes and have their own unique vfs_t.
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* However, vnodes within these mounted on file systems have their v_vfsp
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* fields set to the head filesystem to make NFS happy (see
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* zfsctl_snapdir_lookup()). We VFS_HOLD the head filesystem's vfs_t
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* so that it cannot be freed until all snapshots have been unmounted.
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*/
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#include <fs/fs_subr.h>
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#include <sys/zfs_ctldir.h>
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#include <sys/zfs_ioctl.h>
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#include <sys/zfs_vfsops.h>
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#include <sys/vfs_opreg.h>
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#include <sys/gfs.h>
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#include <sys/stat.h>
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#include <sys/dmu.h>
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#include <sys/dsl_deleg.h>
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#include <sys/mount.h>
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#include <sys/sunddi.h>
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#include "zfs_namecheck.h"
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typedef struct zfsctl_node {
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gfs_dir_t zc_gfs_private;
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uint64_t zc_id;
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timestruc_t zc_cmtime; /* ctime and mtime, always the same */
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} zfsctl_node_t;
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typedef struct zfsctl_snapdir {
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zfsctl_node_t sd_node;
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kmutex_t sd_lock;
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avl_tree_t sd_snaps;
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} zfsctl_snapdir_t;
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typedef struct {
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char *se_name;
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vnode_t *se_root;
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avl_node_t se_node;
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} zfs_snapentry_t;
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static int
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snapentry_compare(const void *a, const void *b)
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{
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const zfs_snapentry_t *sa = a;
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const zfs_snapentry_t *sb = b;
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int ret = strcmp(sa->se_name, sb->se_name);
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if (ret < 0)
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return (-1);
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else if (ret > 0)
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return (1);
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else
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return (0);
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}
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vnodeops_t *zfsctl_ops_root;
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vnodeops_t *zfsctl_ops_snapdir;
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vnodeops_t *zfsctl_ops_snapshot;
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vnodeops_t *zfsctl_ops_shares;
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vnodeops_t *zfsctl_ops_shares_dir;
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static const fs_operation_def_t zfsctl_tops_root[];
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static const fs_operation_def_t zfsctl_tops_snapdir[];
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static const fs_operation_def_t zfsctl_tops_snapshot[];
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static const fs_operation_def_t zfsctl_tops_shares[];
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static vnode_t *zfsctl_mknode_snapdir(vnode_t *);
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static vnode_t *zfsctl_mknode_shares(vnode_t *);
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static vnode_t *zfsctl_snapshot_mknode(vnode_t *, uint64_t objset);
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static int zfsctl_unmount_snap(zfs_snapentry_t *, int, cred_t *);
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static gfs_opsvec_t zfsctl_opsvec[] = {
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{ ".zfs", zfsctl_tops_root, &zfsctl_ops_root },
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{ ".zfs/snapshot", zfsctl_tops_snapdir, &zfsctl_ops_snapdir },
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{ ".zfs/snapshot/vnode", zfsctl_tops_snapshot, &zfsctl_ops_snapshot },
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{ ".zfs/shares", zfsctl_tops_shares, &zfsctl_ops_shares_dir },
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{ ".zfs/shares/vnode", zfsctl_tops_shares, &zfsctl_ops_shares },
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{ NULL }
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};
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/*
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* Root directory elements. We only have two entries
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* snapshot and shares.
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*/
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static gfs_dirent_t zfsctl_root_entries[] = {
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{ "snapshot", zfsctl_mknode_snapdir, GFS_CACHE_VNODE },
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{ "shares", zfsctl_mknode_shares, GFS_CACHE_VNODE },
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{ NULL }
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};
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/* include . and .. in the calculation */
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#define NROOT_ENTRIES ((sizeof (zfsctl_root_entries) / \
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sizeof (gfs_dirent_t)) + 1)
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/*
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* Initialize the various GFS pieces we'll need to create and manipulate .zfs
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* directories. This is called from the ZFS init routine, and initializes the
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* vnode ops vectors that we'll be using.
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*/
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void
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zfsctl_init(void)
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{
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VERIFY(gfs_make_opsvec(zfsctl_opsvec) == 0);
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}
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void
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zfsctl_fini(void)
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{
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/*
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* Remove vfsctl vnode ops
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*/
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if (zfsctl_ops_root)
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vn_freevnodeops(zfsctl_ops_root);
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if (zfsctl_ops_snapdir)
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vn_freevnodeops(zfsctl_ops_snapdir);
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if (zfsctl_ops_snapshot)
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vn_freevnodeops(zfsctl_ops_snapshot);
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if (zfsctl_ops_shares)
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vn_freevnodeops(zfsctl_ops_shares);
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if (zfsctl_ops_shares_dir)
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vn_freevnodeops(zfsctl_ops_shares_dir);
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zfsctl_ops_root = NULL;
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zfsctl_ops_snapdir = NULL;
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zfsctl_ops_snapshot = NULL;
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zfsctl_ops_shares = NULL;
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zfsctl_ops_shares_dir = NULL;
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}
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/*
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* Return the inode number associated with the 'snapshot' or
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* 'shares' directory.
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*/
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/* ARGSUSED */
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static ino64_t
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zfsctl_root_inode_cb(vnode_t *vp, int index)
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{
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zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data;
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ASSERT(index <= 2);
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if (index == 0)
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return (ZFSCTL_INO_SNAPDIR);
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return (zfsvfs->z_shares_dir);
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}
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/*
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* Create the '.zfs' directory. This directory is cached as part of the VFS
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* structure. This results in a hold on the vfs_t. The code in zfs_umount()
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* therefore checks against a vfs_count of 2 instead of 1. This reference
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* is removed when the ctldir is destroyed in the unmount.
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*/
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void
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zfsctl_create(zfsvfs_t *zfsvfs)
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{
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vnode_t *vp, *rvp;
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zfsctl_node_t *zcp;
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ASSERT(zfsvfs->z_ctldir == NULL);
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vp = gfs_root_create(sizeof (zfsctl_node_t), zfsvfs->z_vfs,
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zfsctl_ops_root, ZFSCTL_INO_ROOT, zfsctl_root_entries,
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zfsctl_root_inode_cb, MAXNAMELEN, NULL, NULL);
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zcp = vp->v_data;
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zcp->zc_id = ZFSCTL_INO_ROOT;
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VERIFY(VFS_ROOT(zfsvfs->z_vfs, &rvp) == 0);
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ZFS_TIME_DECODE(&zcp->zc_cmtime, VTOZ(rvp)->z_phys->zp_crtime);
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VN_RELE(rvp);
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/*
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* We're only faking the fact that we have a root of a filesystem for
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* the sake of the GFS interfaces. Undo the flag manipulation it did
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* for us.
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*/
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vp->v_flag &= ~(VROOT | VNOCACHE | VNOMAP | VNOSWAP | VNOMOUNT);
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zfsvfs->z_ctldir = vp;
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}
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/*
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* Destroy the '.zfs' directory. Only called when the filesystem is unmounted.
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* There might still be more references if we were force unmounted, but only
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* new zfs_inactive() calls can occur and they don't reference .zfs
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*/
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void
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zfsctl_destroy(zfsvfs_t *zfsvfs)
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{
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VN_RELE(zfsvfs->z_ctldir);
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zfsvfs->z_ctldir = NULL;
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}
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/*
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* Given a root znode, retrieve the associated .zfs directory.
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* Add a hold to the vnode and return it.
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*/
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vnode_t *
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zfsctl_root(znode_t *zp)
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{
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ASSERT(zfs_has_ctldir(zp));
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VN_HOLD(zp->z_zfsvfs->z_ctldir);
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return (zp->z_zfsvfs->z_ctldir);
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}
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/*
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* Common open routine. Disallow any write access.
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*/
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/* ARGSUSED */
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static int
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zfsctl_common_open(vnode_t **vpp, int flags, cred_t *cr, caller_context_t *ct)
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{
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if (flags & FWRITE)
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return (EACCES);
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return (0);
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}
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/*
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* Common close routine. Nothing to do here.
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*/
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/* ARGSUSED */
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static int
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zfsctl_common_close(vnode_t *vpp, int flags, int count, offset_t off,
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cred_t *cr, caller_context_t *ct)
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{
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return (0);
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}
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/*
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* Common access routine. Disallow writes.
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*/
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/* ARGSUSED */
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static int
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zfsctl_common_access(vnode_t *vp, int mode, int flags, cred_t *cr,
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caller_context_t *ct)
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{
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if (flags & V_ACE_MASK) {
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if (mode & ACE_ALL_WRITE_PERMS)
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return (EACCES);
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} else {
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if (mode & VWRITE)
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return (EACCES);
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}
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return (0);
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}
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/*
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* Common getattr function. Fill in basic information.
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*/
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static void
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zfsctl_common_getattr(vnode_t *vp, vattr_t *vap)
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{
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zfsctl_node_t *zcp = vp->v_data;
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timestruc_t now;
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vap->va_uid = 0;
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vap->va_gid = 0;
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vap->va_rdev = 0;
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/*
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* We are a purly virtual object, so we have no
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* blocksize or allocated blocks.
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*/
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vap->va_blksize = 0;
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vap->va_nblocks = 0;
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vap->va_seq = 0;
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vap->va_fsid = vp->v_vfsp->vfs_dev;
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vap->va_mode = S_IRUSR | S_IXUSR | S_IRGRP | S_IXGRP |
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S_IROTH | S_IXOTH;
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vap->va_type = VDIR;
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/*
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* We live in the now (for atime).
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*/
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gethrestime(&now);
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vap->va_atime = now;
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vap->va_mtime = vap->va_ctime = zcp->zc_cmtime;
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}
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/*ARGSUSED*/
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static int
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zfsctl_common_fid(vnode_t *vp, fid_t *fidp, caller_context_t *ct)
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{
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zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data;
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zfsctl_node_t *zcp = vp->v_data;
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uint64_t object = zcp->zc_id;
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zfid_short_t *zfid;
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int i;
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ZFS_ENTER(zfsvfs);
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if (fidp->fid_len < SHORT_FID_LEN) {
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fidp->fid_len = SHORT_FID_LEN;
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ZFS_EXIT(zfsvfs);
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return (ENOSPC);
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}
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zfid = (zfid_short_t *)fidp;
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zfid->zf_len = SHORT_FID_LEN;
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for (i = 0; i < sizeof (zfid->zf_object); i++)
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zfid->zf_object[i] = (uint8_t)(object >> (8 * i));
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/* .zfs znodes always have a generation number of 0 */
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for (i = 0; i < sizeof (zfid->zf_gen); i++)
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zfid->zf_gen[i] = 0;
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ZFS_EXIT(zfsvfs);
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return (0);
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}
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/*ARGSUSED*/
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static int
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zfsctl_shares_fid(vnode_t *vp, fid_t *fidp, caller_context_t *ct)
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{
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zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data;
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znode_t *dzp;
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int error;
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ZFS_ENTER(zfsvfs);
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if (zfsvfs->z_shares_dir == 0) {
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ZFS_EXIT(zfsvfs);
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return (ENOTSUP);
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}
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if ((error = zfs_zget(zfsvfs, zfsvfs->z_shares_dir, &dzp)) == 0) {
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error = VOP_FID(ZTOV(dzp), fidp, ct);
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VN_RELE(ZTOV(dzp));
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}
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ZFS_EXIT(zfsvfs);
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return (error);
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}
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/*
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* .zfs inode namespace
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*
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* We need to generate unique inode numbers for all files and directories
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* within the .zfs pseudo-filesystem. We use the following scheme:
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*
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* ENTRY ZFSCTL_INODE
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* .zfs 1
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* .zfs/snapshot 2
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* .zfs/snapshot/<snap> objectid(snap)
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*/
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#define ZFSCTL_INO_SNAP(id) (id)
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/*
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* Get root directory attributes.
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*/
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/* ARGSUSED */
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static int
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zfsctl_root_getattr(vnode_t *vp, vattr_t *vap, int flags, cred_t *cr,
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caller_context_t *ct)
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{
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zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data;
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ZFS_ENTER(zfsvfs);
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vap->va_nodeid = ZFSCTL_INO_ROOT;
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vap->va_nlink = vap->va_size = NROOT_ENTRIES;
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zfsctl_common_getattr(vp, vap);
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ZFS_EXIT(zfsvfs);
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return (0);
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}
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|
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/*
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* Special case the handling of "..".
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*/
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/* ARGSUSED */
|
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int
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zfsctl_root_lookup(vnode_t *dvp, char *nm, vnode_t **vpp, pathname_t *pnp,
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int flags, vnode_t *rdir, cred_t *cr, caller_context_t *ct,
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int *direntflags, pathname_t *realpnp)
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{
|
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zfsvfs_t *zfsvfs = dvp->v_vfsp->vfs_data;
|
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int err;
|
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|
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/*
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* No extended attributes allowed under .zfs
|
|
*/
|
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if (flags & LOOKUP_XATTR)
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return (EINVAL);
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ZFS_ENTER(zfsvfs);
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if (strcmp(nm, "..") == 0) {
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err = VFS_ROOT(dvp->v_vfsp, vpp);
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} else {
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err = gfs_vop_lookup(dvp, nm, vpp, pnp, flags, rdir,
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cr, ct, direntflags, realpnp);
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}
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ZFS_EXIT(zfsvfs);
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return (err);
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}
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static int
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zfsctl_pathconf(vnode_t *vp, int cmd, ulong_t *valp, cred_t *cr,
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caller_context_t *ct)
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{
|
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/*
|
|
* We only care about ACL_ENABLED so that libsec can
|
|
* display ACL correctly and not default to POSIX draft.
|
|
*/
|
|
if (cmd == _PC_ACL_ENABLED) {
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*valp = _ACL_ACE_ENABLED;
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return (0);
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}
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|
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return (fs_pathconf(vp, cmd, valp, cr, ct));
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}
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|
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static const fs_operation_def_t zfsctl_tops_root[] = {
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{ VOPNAME_OPEN, { .vop_open = zfsctl_common_open } },
|
|
{ VOPNAME_CLOSE, { .vop_close = zfsctl_common_close } },
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{ VOPNAME_IOCTL, { .error = fs_inval } },
|
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{ VOPNAME_GETATTR, { .vop_getattr = zfsctl_root_getattr } },
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{ VOPNAME_ACCESS, { .vop_access = zfsctl_common_access } },
|
|
{ VOPNAME_READDIR, { .vop_readdir = gfs_vop_readdir } },
|
|
{ VOPNAME_LOOKUP, { .vop_lookup = zfsctl_root_lookup } },
|
|
{ VOPNAME_SEEK, { .vop_seek = fs_seek } },
|
|
{ VOPNAME_INACTIVE, { .vop_inactive = gfs_vop_inactive } },
|
|
{ VOPNAME_PATHCONF, { .vop_pathconf = zfsctl_pathconf } },
|
|
{ VOPNAME_FID, { .vop_fid = zfsctl_common_fid } },
|
|
{ NULL }
|
|
};
|
|
|
|
static int
|
|
zfsctl_snapshot_zname(vnode_t *vp, const char *name, int len, char *zname)
|
|
{
|
|
objset_t *os = ((zfsvfs_t *)((vp)->v_vfsp->vfs_data))->z_os;
|
|
|
|
if (snapshot_namecheck(name, NULL, NULL) != 0)
|
|
return (EILSEQ);
|
|
dmu_objset_name(os, zname);
|
|
if (strlen(zname) + 1 + strlen(name) >= len)
|
|
return (ENAMETOOLONG);
|
|
(void) strcat(zname, "@");
|
|
(void) strcat(zname, name);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
zfsctl_unmount_snap(zfs_snapentry_t *sep, int fflags, cred_t *cr)
|
|
{
|
|
vnode_t *svp = sep->se_root;
|
|
int error;
|
|
|
|
ASSERT(vn_ismntpt(svp));
|
|
|
|
/* this will be dropped by dounmount() */
|
|
if ((error = vn_vfswlock(svp)) != 0)
|
|
return (error);
|
|
|
|
VN_HOLD(svp);
|
|
error = dounmount(vn_mountedvfs(svp), fflags, cr);
|
|
if (error) {
|
|
VN_RELE(svp);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* We can't use VN_RELE(), as that will try to invoke
|
|
* zfsctl_snapdir_inactive(), which would cause us to destroy
|
|
* the sd_lock mutex held by our caller.
|
|
*/
|
|
ASSERT(svp->v_count == 1);
|
|
gfs_vop_inactive(svp, cr, NULL);
|
|
|
|
kmem_free(sep->se_name, strlen(sep->se_name) + 1);
|
|
kmem_free(sep, sizeof (zfs_snapentry_t));
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
zfsctl_rename_snap(zfsctl_snapdir_t *sdp, zfs_snapentry_t *sep, const char *nm)
|
|
{
|
|
avl_index_t where;
|
|
vfs_t *vfsp;
|
|
refstr_t *pathref;
|
|
char newpath[MAXNAMELEN];
|
|
char *tail;
|
|
|
|
ASSERT(MUTEX_HELD(&sdp->sd_lock));
|
|
ASSERT(sep != NULL);
|
|
|
|
vfsp = vn_mountedvfs(sep->se_root);
|
|
ASSERT(vfsp != NULL);
|
|
|
|
vfs_lock_wait(vfsp);
|
|
|
|
/*
|
|
* Change the name in the AVL tree.
|
|
*/
|
|
avl_remove(&sdp->sd_snaps, sep);
|
|
kmem_free(sep->se_name, strlen(sep->se_name) + 1);
|
|
sep->se_name = kmem_alloc(strlen(nm) + 1, KM_SLEEP);
|
|
(void) strcpy(sep->se_name, nm);
|
|
VERIFY(avl_find(&sdp->sd_snaps, sep, &where) == NULL);
|
|
avl_insert(&sdp->sd_snaps, sep, where);
|
|
|
|
/*
|
|
* Change the current mountpoint info:
|
|
* - update the tail of the mntpoint path
|
|
* - update the tail of the resource path
|
|
*/
|
|
pathref = vfs_getmntpoint(vfsp);
|
|
(void) strncpy(newpath, refstr_value(pathref), sizeof (newpath));
|
|
VERIFY((tail = strrchr(newpath, '/')) != NULL);
|
|
*(tail+1) = '\0';
|
|
ASSERT3U(strlen(newpath) + strlen(nm), <, sizeof (newpath));
|
|
(void) strcat(newpath, nm);
|
|
refstr_rele(pathref);
|
|
vfs_setmntpoint(vfsp, newpath);
|
|
|
|
pathref = vfs_getresource(vfsp);
|
|
(void) strncpy(newpath, refstr_value(pathref), sizeof (newpath));
|
|
VERIFY((tail = strrchr(newpath, '@')) != NULL);
|
|
*(tail+1) = '\0';
|
|
ASSERT3U(strlen(newpath) + strlen(nm), <, sizeof (newpath));
|
|
(void) strcat(newpath, nm);
|
|
refstr_rele(pathref);
|
|
vfs_setresource(vfsp, newpath);
|
|
|
|
vfs_unlock(vfsp);
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
static int
|
|
zfsctl_snapdir_rename(vnode_t *sdvp, char *snm, vnode_t *tdvp, char *tnm,
|
|
cred_t *cr, caller_context_t *ct, int flags)
|
|
{
|
|
zfsctl_snapdir_t *sdp = sdvp->v_data;
|
|
zfs_snapentry_t search, *sep;
|
|
zfsvfs_t *zfsvfs;
|
|
avl_index_t where;
|
|
char from[MAXNAMELEN], to[MAXNAMELEN];
|
|
char real[MAXNAMELEN];
|
|
int err;
|
|
|
|
zfsvfs = sdvp->v_vfsp->vfs_data;
|
|
ZFS_ENTER(zfsvfs);
|
|
|
|
if ((flags & FIGNORECASE) || zfsvfs->z_case == ZFS_CASE_INSENSITIVE) {
|
|
err = dmu_snapshot_realname(zfsvfs->z_os, snm, real,
|
|
MAXNAMELEN, NULL);
|
|
if (err == 0) {
|
|
snm = real;
|
|
} else if (err != ENOTSUP) {
|
|
ZFS_EXIT(zfsvfs);
|
|
return (err);
|
|
}
|
|
}
|
|
|
|
ZFS_EXIT(zfsvfs);
|
|
|
|
err = zfsctl_snapshot_zname(sdvp, snm, MAXNAMELEN, from);
|
|
if (!err)
|
|
err = zfsctl_snapshot_zname(tdvp, tnm, MAXNAMELEN, to);
|
|
if (!err)
|
|
err = zfs_secpolicy_rename_perms(from, to, cr);
|
|
if (err)
|
|
return (err);
|
|
|
|
/*
|
|
* Cannot move snapshots out of the snapdir.
|
|
*/
|
|
if (sdvp != tdvp)
|
|
return (EINVAL);
|
|
|
|
if (strcmp(snm, tnm) == 0)
|
|
return (0);
|
|
|
|
mutex_enter(&sdp->sd_lock);
|
|
|
|
search.se_name = (char *)snm;
|
|
if ((sep = avl_find(&sdp->sd_snaps, &search, &where)) == NULL) {
|
|
mutex_exit(&sdp->sd_lock);
|
|
return (ENOENT);
|
|
}
|
|
|
|
err = dmu_objset_rename(from, to, B_FALSE);
|
|
if (err == 0)
|
|
zfsctl_rename_snap(sdp, sep, tnm);
|
|
|
|
mutex_exit(&sdp->sd_lock);
|
|
|
|
return (err);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static int
|
|
zfsctl_snapdir_remove(vnode_t *dvp, char *name, vnode_t *cwd, cred_t *cr,
|
|
caller_context_t *ct, int flags)
|
|
{
|
|
zfsctl_snapdir_t *sdp = dvp->v_data;
|
|
zfs_snapentry_t *sep;
|
|
zfs_snapentry_t search;
|
|
zfsvfs_t *zfsvfs;
|
|
char snapname[MAXNAMELEN];
|
|
char real[MAXNAMELEN];
|
|
int err;
|
|
|
|
zfsvfs = dvp->v_vfsp->vfs_data;
|
|
ZFS_ENTER(zfsvfs);
|
|
|
|
if ((flags & FIGNORECASE) || zfsvfs->z_case == ZFS_CASE_INSENSITIVE) {
|
|
|
|
err = dmu_snapshot_realname(zfsvfs->z_os, name, real,
|
|
MAXNAMELEN, NULL);
|
|
if (err == 0) {
|
|
name = real;
|
|
} else if (err != ENOTSUP) {
|
|
ZFS_EXIT(zfsvfs);
|
|
return (err);
|
|
}
|
|
}
|
|
|
|
ZFS_EXIT(zfsvfs);
|
|
|
|
err = zfsctl_snapshot_zname(dvp, name, MAXNAMELEN, snapname);
|
|
if (!err)
|
|
err = zfs_secpolicy_destroy_perms(snapname, cr);
|
|
if (err)
|
|
return (err);
|
|
|
|
mutex_enter(&sdp->sd_lock);
|
|
|
|
search.se_name = name;
|
|
sep = avl_find(&sdp->sd_snaps, &search, NULL);
|
|
if (sep) {
|
|
avl_remove(&sdp->sd_snaps, sep);
|
|
err = zfsctl_unmount_snap(sep, MS_FORCE, cr);
|
|
if (err)
|
|
avl_add(&sdp->sd_snaps, sep);
|
|
else
|
|
err = dmu_objset_destroy(snapname);
|
|
} else {
|
|
err = ENOENT;
|
|
}
|
|
|
|
mutex_exit(&sdp->sd_lock);
|
|
|
|
return (err);
|
|
}
|
|
|
|
/*
|
|
* This creates a snapshot under '.zfs/snapshot'.
|
|
*/
|
|
/* ARGSUSED */
|
|
static int
|
|
zfsctl_snapdir_mkdir(vnode_t *dvp, char *dirname, vattr_t *vap, vnode_t **vpp,
|
|
cred_t *cr, caller_context_t *cc, int flags, vsecattr_t *vsecp)
|
|
{
|
|
zfsvfs_t *zfsvfs = dvp->v_vfsp->vfs_data;
|
|
char name[MAXNAMELEN];
|
|
int err;
|
|
static enum symfollow follow = NO_FOLLOW;
|
|
static enum uio_seg seg = UIO_SYSSPACE;
|
|
|
|
if (snapshot_namecheck(dirname, NULL, NULL) != 0)
|
|
return (EILSEQ);
|
|
|
|
dmu_objset_name(zfsvfs->z_os, name);
|
|
|
|
*vpp = NULL;
|
|
|
|
err = zfs_secpolicy_snapshot_perms(name, cr);
|
|
if (err)
|
|
return (err);
|
|
|
|
if (err == 0) {
|
|
err = dmu_objset_snapshot(name, dirname, NULL, B_FALSE);
|
|
if (err)
|
|
return (err);
|
|
err = lookupnameat(dirname, seg, follow, NULL, vpp, dvp);
|
|
}
|
|
|
|
return (err);
|
|
}
|
|
|
|
/*
|
|
* Lookup entry point for the 'snapshot' directory. Try to open the
|
|
* snapshot if it exist, creating the pseudo filesystem vnode as necessary.
|
|
* Perform a mount of the associated dataset on top of the vnode.
|
|
*/
|
|
/* ARGSUSED */
|
|
static int
|
|
zfsctl_snapdir_lookup(vnode_t *dvp, char *nm, vnode_t **vpp, pathname_t *pnp,
|
|
int flags, vnode_t *rdir, cred_t *cr, caller_context_t *ct,
|
|
int *direntflags, pathname_t *realpnp)
|
|
{
|
|
zfsctl_snapdir_t *sdp = dvp->v_data;
|
|
objset_t *snap;
|
|
char snapname[MAXNAMELEN];
|
|
char real[MAXNAMELEN];
|
|
char *mountpoint;
|
|
zfs_snapentry_t *sep, search;
|
|
struct mounta margs;
|
|
vfs_t *vfsp;
|
|
size_t mountpoint_len;
|
|
avl_index_t where;
|
|
zfsvfs_t *zfsvfs = dvp->v_vfsp->vfs_data;
|
|
int err;
|
|
|
|
/*
|
|
* No extended attributes allowed under .zfs
|
|
*/
|
|
if (flags & LOOKUP_XATTR)
|
|
return (EINVAL);
|
|
|
|
ASSERT(dvp->v_type == VDIR);
|
|
|
|
/*
|
|
* If we get a recursive call, that means we got called
|
|
* from the domount() code while it was trying to look up the
|
|
* spec (which looks like a local path for zfs). We need to
|
|
* add some flag to domount() to tell it not to do this lookup.
|
|
*/
|
|
if (MUTEX_HELD(&sdp->sd_lock))
|
|
return (ENOENT);
|
|
|
|
ZFS_ENTER(zfsvfs);
|
|
|
|
if (gfs_lookup_dot(vpp, dvp, zfsvfs->z_ctldir, nm) == 0) {
|
|
ZFS_EXIT(zfsvfs);
|
|
return (0);
|
|
}
|
|
|
|
if (flags & FIGNORECASE) {
|
|
boolean_t conflict = B_FALSE;
|
|
|
|
err = dmu_snapshot_realname(zfsvfs->z_os, nm, real,
|
|
MAXNAMELEN, &conflict);
|
|
if (err == 0) {
|
|
nm = real;
|
|
} else if (err != ENOTSUP) {
|
|
ZFS_EXIT(zfsvfs);
|
|
return (err);
|
|
}
|
|
if (realpnp)
|
|
(void) strlcpy(realpnp->pn_buf, nm,
|
|
realpnp->pn_bufsize);
|
|
if (conflict && direntflags)
|
|
*direntflags = ED_CASE_CONFLICT;
|
|
}
|
|
|
|
mutex_enter(&sdp->sd_lock);
|
|
search.se_name = (char *)nm;
|
|
if ((sep = avl_find(&sdp->sd_snaps, &search, &where)) != NULL) {
|
|
*vpp = sep->se_root;
|
|
VN_HOLD(*vpp);
|
|
err = traverse(vpp);
|
|
if (err) {
|
|
VN_RELE(*vpp);
|
|
*vpp = NULL;
|
|
} else if (*vpp == sep->se_root) {
|
|
/*
|
|
* The snapshot was unmounted behind our backs,
|
|
* try to remount it.
|
|
*/
|
|
goto domount;
|
|
} else {
|
|
/*
|
|
* VROOT was set during the traverse call. We need
|
|
* to clear it since we're pretending to be part
|
|
* of our parent's vfs.
|
|
*/
|
|
(*vpp)->v_flag &= ~VROOT;
|
|
}
|
|
mutex_exit(&sdp->sd_lock);
|
|
ZFS_EXIT(zfsvfs);
|
|
return (err);
|
|
}
|
|
|
|
/*
|
|
* The requested snapshot is not currently mounted, look it up.
|
|
*/
|
|
err = zfsctl_snapshot_zname(dvp, nm, MAXNAMELEN, snapname);
|
|
if (err) {
|
|
mutex_exit(&sdp->sd_lock);
|
|
ZFS_EXIT(zfsvfs);
|
|
/*
|
|
* handle "ls *" or "?" in a graceful manner,
|
|
* forcing EILSEQ to ENOENT.
|
|
* Since shell ultimately passes "*" or "?" as name to lookup
|
|
*/
|
|
return (err == EILSEQ ? ENOENT : err);
|
|
}
|
|
if (dmu_objset_open(snapname, DMU_OST_ZFS,
|
|
DS_MODE_USER | DS_MODE_READONLY, &snap) != 0) {
|
|
mutex_exit(&sdp->sd_lock);
|
|
ZFS_EXIT(zfsvfs);
|
|
return (ENOENT);
|
|
}
|
|
|
|
sep = kmem_alloc(sizeof (zfs_snapentry_t), KM_SLEEP);
|
|
sep->se_name = kmem_alloc(strlen(nm) + 1, KM_SLEEP);
|
|
(void) strcpy(sep->se_name, nm);
|
|
*vpp = sep->se_root = zfsctl_snapshot_mknode(dvp, dmu_objset_id(snap));
|
|
avl_insert(&sdp->sd_snaps, sep, where);
|
|
|
|
dmu_objset_close(snap);
|
|
domount:
|
|
mountpoint_len = strlen(refstr_value(dvp->v_vfsp->vfs_mntpt)) +
|
|
strlen("/.zfs/snapshot/") + strlen(nm) + 1;
|
|
mountpoint = kmem_alloc(mountpoint_len, KM_SLEEP);
|
|
(void) snprintf(mountpoint, mountpoint_len, "%s/.zfs/snapshot/%s",
|
|
refstr_value(dvp->v_vfsp->vfs_mntpt), nm);
|
|
|
|
margs.spec = snapname;
|
|
margs.dir = mountpoint;
|
|
margs.flags = MS_SYSSPACE | MS_NOMNTTAB;
|
|
margs.fstype = "zfs";
|
|
margs.dataptr = NULL;
|
|
margs.datalen = 0;
|
|
margs.optptr = NULL;
|
|
margs.optlen = 0;
|
|
|
|
err = domount("zfs", &margs, *vpp, kcred, &vfsp);
|
|
kmem_free(mountpoint, mountpoint_len);
|
|
|
|
if (err == 0) {
|
|
/*
|
|
* Return the mounted root rather than the covered mount point.
|
|
* Takes the GFS vnode at .zfs/snapshot/<snapname> and returns
|
|
* the ZFS vnode mounted on top of the GFS node. This ZFS
|
|
* vnode is the root of the newly created vfsp.
|
|
*/
|
|
VFS_RELE(vfsp);
|
|
err = traverse(vpp);
|
|
}
|
|
|
|
if (err == 0) {
|
|
/*
|
|
* Fix up the root vnode mounted on .zfs/snapshot/<snapname>.
|
|
*
|
|
* This is where we lie about our v_vfsp in order to
|
|
* make .zfs/snapshot/<snapname> accessible over NFS
|
|
* without requiring manual mounts of <snapname>.
|
|
*/
|
|
ASSERT(VTOZ(*vpp)->z_zfsvfs != zfsvfs);
|
|
VTOZ(*vpp)->z_zfsvfs->z_parent = zfsvfs;
|
|
(*vpp)->v_vfsp = zfsvfs->z_vfs;
|
|
(*vpp)->v_flag &= ~VROOT;
|
|
}
|
|
mutex_exit(&sdp->sd_lock);
|
|
ZFS_EXIT(zfsvfs);
|
|
|
|
/*
|
|
* If we had an error, drop our hold on the vnode and
|
|
* zfsctl_snapshot_inactive() will clean up.
|
|
*/
|
|
if (err) {
|
|
VN_RELE(*vpp);
|
|
*vpp = NULL;
|
|
}
|
|
return (err);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static int
|
|
zfsctl_shares_lookup(vnode_t *dvp, char *nm, vnode_t **vpp, pathname_t *pnp,
|
|
int flags, vnode_t *rdir, cred_t *cr, caller_context_t *ct,
|
|
int *direntflags, pathname_t *realpnp)
|
|
{
|
|
zfsvfs_t *zfsvfs = dvp->v_vfsp->vfs_data;
|
|
znode_t *dzp;
|
|
int error;
|
|
|
|
ZFS_ENTER(zfsvfs);
|
|
|
|
if (gfs_lookup_dot(vpp, dvp, zfsvfs->z_ctldir, nm) == 0) {
|
|
ZFS_EXIT(zfsvfs);
|
|
return (0);
|
|
}
|
|
|
|
if (zfsvfs->z_shares_dir == 0) {
|
|
ZFS_EXIT(zfsvfs);
|
|
return (ENOTSUP);
|
|
}
|
|
if ((error = zfs_zget(zfsvfs, zfsvfs->z_shares_dir, &dzp)) == 0)
|
|
error = VOP_LOOKUP(ZTOV(dzp), nm, vpp, pnp,
|
|
flags, rdir, cr, ct, direntflags, realpnp);
|
|
|
|
VN_RELE(ZTOV(dzp));
|
|
ZFS_EXIT(zfsvfs);
|
|
|
|
return (error);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static int
|
|
zfsctl_snapdir_readdir_cb(vnode_t *vp, void *dp, int *eofp,
|
|
offset_t *offp, offset_t *nextp, void *data, int flags)
|
|
{
|
|
zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data;
|
|
char snapname[MAXNAMELEN];
|
|
uint64_t id, cookie;
|
|
boolean_t case_conflict;
|
|
int error;
|
|
|
|
ZFS_ENTER(zfsvfs);
|
|
|
|
cookie = *offp;
|
|
error = dmu_snapshot_list_next(zfsvfs->z_os, MAXNAMELEN, snapname, &id,
|
|
&cookie, &case_conflict);
|
|
if (error) {
|
|
ZFS_EXIT(zfsvfs);
|
|
if (error == ENOENT) {
|
|
*eofp = 1;
|
|
return (0);
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
if (flags & V_RDDIR_ENTFLAGS) {
|
|
edirent_t *eodp = dp;
|
|
|
|
(void) strcpy(eodp->ed_name, snapname);
|
|
eodp->ed_ino = ZFSCTL_INO_SNAP(id);
|
|
eodp->ed_eflags = case_conflict ? ED_CASE_CONFLICT : 0;
|
|
} else {
|
|
struct dirent64 *odp = dp;
|
|
|
|
(void) strcpy(odp->d_name, snapname);
|
|
odp->d_ino = ZFSCTL_INO_SNAP(id);
|
|
}
|
|
*nextp = cookie;
|
|
|
|
ZFS_EXIT(zfsvfs);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static int
|
|
zfsctl_shares_readdir(vnode_t *vp, uio_t *uiop, cred_t *cr, int *eofp,
|
|
caller_context_t *ct, int flags)
|
|
{
|
|
zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data;
|
|
znode_t *dzp;
|
|
int error;
|
|
|
|
ZFS_ENTER(zfsvfs);
|
|
|
|
if (zfsvfs->z_shares_dir == 0) {
|
|
ZFS_EXIT(zfsvfs);
|
|
return (ENOTSUP);
|
|
}
|
|
if ((error = zfs_zget(zfsvfs, zfsvfs->z_shares_dir, &dzp)) == 0) {
|
|
error = VOP_READDIR(ZTOV(dzp), uiop, cr, eofp, ct, flags);
|
|
VN_RELE(ZTOV(dzp));
|
|
} else {
|
|
*eofp = 1;
|
|
error = ENOENT;
|
|
}
|
|
|
|
ZFS_EXIT(zfsvfs);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* pvp is the '.zfs' directory (zfsctl_node_t).
|
|
* Creates vp, which is '.zfs/snapshot' (zfsctl_snapdir_t).
|
|
*
|
|
* This function is the callback to create a GFS vnode for '.zfs/snapshot'
|
|
* when a lookup is performed on .zfs for "snapshot".
|
|
*/
|
|
vnode_t *
|
|
zfsctl_mknode_snapdir(vnode_t *pvp)
|
|
{
|
|
vnode_t *vp;
|
|
zfsctl_snapdir_t *sdp;
|
|
|
|
vp = gfs_dir_create(sizeof (zfsctl_snapdir_t), pvp,
|
|
zfsctl_ops_snapdir, NULL, NULL, MAXNAMELEN,
|
|
zfsctl_snapdir_readdir_cb, NULL);
|
|
sdp = vp->v_data;
|
|
sdp->sd_node.zc_id = ZFSCTL_INO_SNAPDIR;
|
|
sdp->sd_node.zc_cmtime = ((zfsctl_node_t *)pvp->v_data)->zc_cmtime;
|
|
mutex_init(&sdp->sd_lock, NULL, MUTEX_DEFAULT, NULL);
|
|
avl_create(&sdp->sd_snaps, snapentry_compare,
|
|
sizeof (zfs_snapentry_t), offsetof(zfs_snapentry_t, se_node));
|
|
return (vp);
|
|
}
|
|
|
|
vnode_t *
|
|
zfsctl_mknode_shares(vnode_t *pvp)
|
|
{
|
|
vnode_t *vp;
|
|
zfsctl_node_t *sdp;
|
|
|
|
vp = gfs_dir_create(sizeof (zfsctl_node_t), pvp,
|
|
zfsctl_ops_shares, NULL, NULL, MAXNAMELEN,
|
|
NULL, NULL);
|
|
sdp = vp->v_data;
|
|
sdp->zc_cmtime = ((zfsctl_node_t *)pvp->v_data)->zc_cmtime;
|
|
return (vp);
|
|
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static int
|
|
zfsctl_shares_getattr(vnode_t *vp, vattr_t *vap, int flags, cred_t *cr,
|
|
caller_context_t *ct)
|
|
{
|
|
zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data;
|
|
znode_t *dzp;
|
|
int error;
|
|
|
|
ZFS_ENTER(zfsvfs);
|
|
if (zfsvfs->z_shares_dir == 0) {
|
|
ZFS_EXIT(zfsvfs);
|
|
return (ENOTSUP);
|
|
}
|
|
if ((error = zfs_zget(zfsvfs, zfsvfs->z_shares_dir, &dzp)) == 0) {
|
|
error = VOP_GETATTR(ZTOV(dzp), vap, flags, cr, ct);
|
|
VN_RELE(ZTOV(dzp));
|
|
}
|
|
ZFS_EXIT(zfsvfs);
|
|
return (error);
|
|
|
|
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static int
|
|
zfsctl_snapdir_getattr(vnode_t *vp, vattr_t *vap, int flags, cred_t *cr,
|
|
caller_context_t *ct)
|
|
{
|
|
zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data;
|
|
zfsctl_snapdir_t *sdp = vp->v_data;
|
|
|
|
ZFS_ENTER(zfsvfs);
|
|
zfsctl_common_getattr(vp, vap);
|
|
vap->va_nodeid = gfs_file_inode(vp);
|
|
vap->va_nlink = vap->va_size = avl_numnodes(&sdp->sd_snaps) + 2;
|
|
ZFS_EXIT(zfsvfs);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static void
|
|
zfsctl_snapdir_inactive(vnode_t *vp, cred_t *cr, caller_context_t *ct)
|
|
{
|
|
zfsctl_snapdir_t *sdp = vp->v_data;
|
|
void *private;
|
|
|
|
private = gfs_dir_inactive(vp);
|
|
if (private != NULL) {
|
|
ASSERT(avl_numnodes(&sdp->sd_snaps) == 0);
|
|
mutex_destroy(&sdp->sd_lock);
|
|
avl_destroy(&sdp->sd_snaps);
|
|
kmem_free(private, sizeof (zfsctl_snapdir_t));
|
|
}
|
|
}
|
|
|
|
static const fs_operation_def_t zfsctl_tops_snapdir[] = {
|
|
{ VOPNAME_OPEN, { .vop_open = zfsctl_common_open } },
|
|
{ VOPNAME_CLOSE, { .vop_close = zfsctl_common_close } },
|
|
{ VOPNAME_IOCTL, { .error = fs_inval } },
|
|
{ VOPNAME_GETATTR, { .vop_getattr = zfsctl_snapdir_getattr } },
|
|
{ VOPNAME_ACCESS, { .vop_access = zfsctl_common_access } },
|
|
{ VOPNAME_RENAME, { .vop_rename = zfsctl_snapdir_rename } },
|
|
{ VOPNAME_RMDIR, { .vop_rmdir = zfsctl_snapdir_remove } },
|
|
{ VOPNAME_MKDIR, { .vop_mkdir = zfsctl_snapdir_mkdir } },
|
|
{ VOPNAME_READDIR, { .vop_readdir = gfs_vop_readdir } },
|
|
{ VOPNAME_LOOKUP, { .vop_lookup = zfsctl_snapdir_lookup } },
|
|
{ VOPNAME_SEEK, { .vop_seek = fs_seek } },
|
|
{ VOPNAME_INACTIVE, { .vop_inactive = zfsctl_snapdir_inactive } },
|
|
{ VOPNAME_FID, { .vop_fid = zfsctl_common_fid } },
|
|
{ NULL }
|
|
};
|
|
|
|
static const fs_operation_def_t zfsctl_tops_shares[] = {
|
|
{ VOPNAME_OPEN, { .vop_open = zfsctl_common_open } },
|
|
{ VOPNAME_CLOSE, { .vop_close = zfsctl_common_close } },
|
|
{ VOPNAME_IOCTL, { .error = fs_inval } },
|
|
{ VOPNAME_GETATTR, { .vop_getattr = zfsctl_shares_getattr } },
|
|
{ VOPNAME_ACCESS, { .vop_access = zfsctl_common_access } },
|
|
{ VOPNAME_READDIR, { .vop_readdir = zfsctl_shares_readdir } },
|
|
{ VOPNAME_LOOKUP, { .vop_lookup = zfsctl_shares_lookup } },
|
|
{ VOPNAME_SEEK, { .vop_seek = fs_seek } },
|
|
{ VOPNAME_INACTIVE, { .vop_inactive = gfs_vop_inactive } },
|
|
{ VOPNAME_FID, { .vop_fid = zfsctl_shares_fid } },
|
|
{ NULL }
|
|
};
|
|
|
|
/*
|
|
* pvp is the GFS vnode '.zfs/snapshot'.
|
|
*
|
|
* This creates a GFS node under '.zfs/snapshot' representing each
|
|
* snapshot. This newly created GFS node is what we mount snapshot
|
|
* vfs_t's ontop of.
|
|
*/
|
|
static vnode_t *
|
|
zfsctl_snapshot_mknode(vnode_t *pvp, uint64_t objset)
|
|
{
|
|
vnode_t *vp;
|
|
zfsctl_node_t *zcp;
|
|
|
|
vp = gfs_dir_create(sizeof (zfsctl_node_t), pvp,
|
|
zfsctl_ops_snapshot, NULL, NULL, MAXNAMELEN, NULL, NULL);
|
|
zcp = vp->v_data;
|
|
zcp->zc_id = objset;
|
|
|
|
return (vp);
|
|
}
|
|
|
|
static void
|
|
zfsctl_snapshot_inactive(vnode_t *vp, cred_t *cr, caller_context_t *ct)
|
|
{
|
|
zfsctl_snapdir_t *sdp;
|
|
zfs_snapentry_t *sep, *next;
|
|
vnode_t *dvp;
|
|
|
|
VERIFY(gfs_dir_lookup(vp, "..", &dvp, cr, 0, NULL, NULL) == 0);
|
|
sdp = dvp->v_data;
|
|
|
|
mutex_enter(&sdp->sd_lock);
|
|
|
|
if (vp->v_count > 1) {
|
|
mutex_exit(&sdp->sd_lock);
|
|
return;
|
|
}
|
|
ASSERT(!vn_ismntpt(vp));
|
|
|
|
sep = avl_first(&sdp->sd_snaps);
|
|
while (sep != NULL) {
|
|
next = AVL_NEXT(&sdp->sd_snaps, sep);
|
|
|
|
if (sep->se_root == vp) {
|
|
avl_remove(&sdp->sd_snaps, sep);
|
|
kmem_free(sep->se_name, strlen(sep->se_name) + 1);
|
|
kmem_free(sep, sizeof (zfs_snapentry_t));
|
|
break;
|
|
}
|
|
sep = next;
|
|
}
|
|
ASSERT(sep != NULL);
|
|
|
|
mutex_exit(&sdp->sd_lock);
|
|
VN_RELE(dvp);
|
|
|
|
/*
|
|
* Dispose of the vnode for the snapshot mount point.
|
|
* This is safe to do because once this entry has been removed
|
|
* from the AVL tree, it can't be found again, so cannot become
|
|
* "active". If we lookup the same name again we will end up
|
|
* creating a new vnode.
|
|
*/
|
|
gfs_vop_inactive(vp, cr, ct);
|
|
}
|
|
|
|
|
|
/*
|
|
* These VP's should never see the light of day. They should always
|
|
* be covered.
|
|
*/
|
|
static const fs_operation_def_t zfsctl_tops_snapshot[] = {
|
|
VOPNAME_INACTIVE, { .vop_inactive = zfsctl_snapshot_inactive },
|
|
NULL, NULL
|
|
};
|
|
|
|
int
|
|
zfsctl_lookup_objset(vfs_t *vfsp, uint64_t objsetid, zfsvfs_t **zfsvfsp)
|
|
{
|
|
zfsvfs_t *zfsvfs = vfsp->vfs_data;
|
|
vnode_t *dvp, *vp;
|
|
zfsctl_snapdir_t *sdp;
|
|
zfsctl_node_t *zcp;
|
|
zfs_snapentry_t *sep;
|
|
int error;
|
|
|
|
ASSERT(zfsvfs->z_ctldir != NULL);
|
|
error = zfsctl_root_lookup(zfsvfs->z_ctldir, "snapshot", &dvp,
|
|
NULL, 0, NULL, kcred, NULL, NULL, NULL);
|
|
if (error != 0)
|
|
return (error);
|
|
sdp = dvp->v_data;
|
|
|
|
mutex_enter(&sdp->sd_lock);
|
|
sep = avl_first(&sdp->sd_snaps);
|
|
while (sep != NULL) {
|
|
vp = sep->se_root;
|
|
zcp = vp->v_data;
|
|
if (zcp->zc_id == objsetid)
|
|
break;
|
|
|
|
sep = AVL_NEXT(&sdp->sd_snaps, sep);
|
|
}
|
|
|
|
if (sep != NULL) {
|
|
VN_HOLD(vp);
|
|
/*
|
|
* Return the mounted root rather than the covered mount point.
|
|
* Takes the GFS vnode at .zfs/snapshot/<snapshot objsetid>
|
|
* and returns the ZFS vnode mounted on top of the GFS node.
|
|
* This ZFS vnode is the root of the vfs for objset 'objsetid'.
|
|
*/
|
|
error = traverse(&vp);
|
|
if (error == 0) {
|
|
if (vp == sep->se_root)
|
|
error = EINVAL;
|
|
else
|
|
*zfsvfsp = VTOZ(vp)->z_zfsvfs;
|
|
}
|
|
mutex_exit(&sdp->sd_lock);
|
|
VN_RELE(vp);
|
|
} else {
|
|
error = EINVAL;
|
|
mutex_exit(&sdp->sd_lock);
|
|
}
|
|
|
|
VN_RELE(dvp);
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Unmount any snapshots for the given filesystem. This is called from
|
|
* zfs_umount() - if we have a ctldir, then go through and unmount all the
|
|
* snapshots.
|
|
*/
|
|
int
|
|
zfsctl_umount_snapshots(vfs_t *vfsp, int fflags, cred_t *cr)
|
|
{
|
|
zfsvfs_t *zfsvfs = vfsp->vfs_data;
|
|
vnode_t *dvp;
|
|
zfsctl_snapdir_t *sdp;
|
|
zfs_snapentry_t *sep, *next;
|
|
int error;
|
|
|
|
ASSERT(zfsvfs->z_ctldir != NULL);
|
|
error = zfsctl_root_lookup(zfsvfs->z_ctldir, "snapshot", &dvp,
|
|
NULL, 0, NULL, cr, NULL, NULL, NULL);
|
|
if (error != 0)
|
|
return (error);
|
|
sdp = dvp->v_data;
|
|
|
|
mutex_enter(&sdp->sd_lock);
|
|
|
|
sep = avl_first(&sdp->sd_snaps);
|
|
while (sep != NULL) {
|
|
next = AVL_NEXT(&sdp->sd_snaps, sep);
|
|
|
|
/*
|
|
* If this snapshot is not mounted, then it must
|
|
* have just been unmounted by somebody else, and
|
|
* will be cleaned up by zfsctl_snapdir_inactive().
|
|
*/
|
|
if (vn_ismntpt(sep->se_root)) {
|
|
avl_remove(&sdp->sd_snaps, sep);
|
|
error = zfsctl_unmount_snap(sep, fflags, cr);
|
|
if (error) {
|
|
avl_add(&sdp->sd_snaps, sep);
|
|
break;
|
|
}
|
|
}
|
|
sep = next;
|
|
}
|
|
|
|
mutex_exit(&sdp->sd_lock);
|
|
VN_RELE(dvp);
|
|
|
|
return (error);
|
|
}
|