+++ /dev/null
-/*
- * CDDL HEADER START
- *
- * The contents of this file are subject to the terms of the
- * Common Development and Distribution License (the "License").
- * You may not use this file except in compliance with the License.
- *
- * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
- * or http://www.opensolaris.org/os/licensing.
- * See the License for the specific language governing permissions
- * and limitations under the License.
- *
- * When distributing Covered Code, include this CDDL HEADER in each
- * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
- * If applicable, add the following below this CDDL HEADER, with the
- * fields enclosed by brackets "[]" replaced with your own identifying
- * information: Portions Copyright [yyyy] [name of copyright owner]
- *
- * CDDL HEADER END
- */
-/*
- * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
- */
-
-/*
- * ZFS control directory (a.k.a. ".zfs")
- *
- * This directory provides a common location for all ZFS meta-objects.
- * Currently, this is only the 'snapshot' directory, but this may expand in the
- * future. The elements are built using the GFS primitives, as the hierarchy
- * does not actually exist on disk.
- *
- * For 'snapshot', we don't want to have all snapshots always mounted, because
- * this would take up a huge amount of space in /etc/mtab. We have three
- * types of objects:
- *
- * ctldir ------> snapshotdir -------> snapshot
- * |
- * |
- * V
- * mounted fs
- *
- * The 'snapshot' node contains just enough information to lookup '..' and act
- * as a mountpoint for the snapshot. Whenever we lookup a specific snapshot, we
- * perform an automount of the underlying filesystem and return the
- * corresponding vnode.
- *
- * All mounts are handled automatically by the kernel, but unmounts are
- * (currently) handled from user land. The main reason is that there is no
- * reliable way to auto-unmount the filesystem when it's "no longer in use".
- * When the user unmounts a filesystem, we call zfsctl_unmount(), which
- * unmounts any snapshots within the snapshot directory.
- *
- * The '.zfs', '.zfs/snapshot', and all directories created under
- * '.zfs/snapshot' (ie: '.zfs/snapshot/<snapname>') are all GFS nodes and
- * share the same vfs_t as the head filesystem (what '.zfs' lives under).
- *
- * File systems mounted ontop of the GFS nodes '.zfs/snapshot/<snapname>'
- * (ie: snapshots) are ZFS nodes and have their own unique vfs_t.
- * However, vnodes within these mounted on file systems have their v_vfsp
- * fields set to the head filesystem to make NFS happy (see
- * zfsctl_snapdir_lookup()). We VFS_HOLD the head filesystem's vfs_t
- * so that it cannot be freed until all snapshots have been unmounted.
- */
-
-#ifdef HAVE_ZPL
-
-#include <fs/fs_subr.h>
-#include <sys/zfs_ctldir.h>
-#include <sys/zfs_ioctl.h>
-#include <sys/zfs_vfsops.h>
-#include <sys/vfs_opreg.h>
-#include <sys/gfs.h>
-#include <sys/stat.h>
-#include <sys/dmu.h>
-#include <sys/dsl_deleg.h>
-#include <sys/mount.h>
-#include <sys/sunddi.h>
-
-#include "zfs_namecheck.h"
-
-typedef struct zfsctl_node {
- gfs_dir_t zc_gfs_private;
- uint64_t zc_id;
- timestruc_t zc_cmtime; /* ctime and mtime, always the same */
-} zfsctl_node_t;
-
-typedef struct zfsctl_snapdir {
- zfsctl_node_t sd_node;
- kmutex_t sd_lock;
- avl_tree_t sd_snaps;
-} zfsctl_snapdir_t;
-
-typedef struct {
- char *se_name;
- vnode_t *se_root;
- avl_node_t se_node;
-} zfs_snapentry_t;
-
-static int
-snapentry_compare(const void *a, const void *b)
-{
- const zfs_snapentry_t *sa = a;
- const zfs_snapentry_t *sb = b;
- int ret = strcmp(sa->se_name, sb->se_name);
-
- if (ret < 0)
- return (-1);
- else if (ret > 0)
- return (1);
- else
- return (0);
-}
-
-vnodeops_t *zfsctl_ops_root;
-vnodeops_t *zfsctl_ops_snapdir;
-vnodeops_t *zfsctl_ops_snapshot;
-vnodeops_t *zfsctl_ops_shares;
-vnodeops_t *zfsctl_ops_shares_dir;
-
-static const fs_operation_def_t zfsctl_tops_root[];
-static const fs_operation_def_t zfsctl_tops_snapdir[];
-static const fs_operation_def_t zfsctl_tops_snapshot[];
-static const fs_operation_def_t zfsctl_tops_shares[];
-
-static vnode_t *zfsctl_mknode_snapdir(vnode_t *);
-static vnode_t *zfsctl_mknode_shares(vnode_t *);
-static vnode_t *zfsctl_snapshot_mknode(vnode_t *, uint64_t objset);
-static int zfsctl_unmount_snap(zfs_snapentry_t *, int, cred_t *);
-
-/*
- * Root directory elements. We only have two entries
- * snapshot and shares.
- */
-static gfs_dirent_t zfsctl_root_entries[] = {
- { "snapshot", zfsctl_mknode_snapdir, GFS_CACHE_VNODE },
- { "shares", zfsctl_mknode_shares, GFS_CACHE_VNODE },
- { NULL }
-};
-
-/* include . and .. in the calculation */
-#define NROOT_ENTRIES ((sizeof (zfsctl_root_entries) / \
- sizeof (gfs_dirent_t)) + 1)
-
-
-/*
- * Initialize the various GFS pieces we'll need to create and manipulate .zfs
- * directories. This is called from the ZFS init routine, and initializes the
- * vnode ops vectors that we'll be using.
- */
-void
-zfsctl_init(void)
-{
-}
-
-void
-zfsctl_fini(void)
-{
- /*
- * Remove vfsctl vnode ops
- */
- if (zfsctl_ops_root)
- vn_freevnodeops(zfsctl_ops_root);
- if (zfsctl_ops_snapdir)
- vn_freevnodeops(zfsctl_ops_snapdir);
- if (zfsctl_ops_snapshot)
- vn_freevnodeops(zfsctl_ops_snapshot);
- if (zfsctl_ops_shares)
- vn_freevnodeops(zfsctl_ops_shares);
- if (zfsctl_ops_shares_dir)
- vn_freevnodeops(zfsctl_ops_shares_dir);
-
- zfsctl_ops_root = NULL;
- zfsctl_ops_snapdir = NULL;
- zfsctl_ops_snapshot = NULL;
- zfsctl_ops_shares = NULL;
- zfsctl_ops_shares_dir = NULL;
-}
-
-boolean_t
-zfsctl_is_node(vnode_t *vp)
-{
- return (vn_matchops(vp, zfsctl_ops_root) ||
- vn_matchops(vp, zfsctl_ops_snapdir) ||
- vn_matchops(vp, zfsctl_ops_snapshot) ||
- vn_matchops(vp, zfsctl_ops_shares) ||
- vn_matchops(vp, zfsctl_ops_shares_dir));
-
-}
-
-/*
- * Return the inode number associated with the 'snapshot' or
- * 'shares' directory.
- */
-/* ARGSUSED */
-static ino64_t
-zfsctl_root_inode_cb(vnode_t *vp, int index)
-{
- zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data;
-
- ASSERT(index <= 2);
-
- if (index == 0)
- return (ZFSCTL_INO_SNAPDIR);
-
- return (zfsvfs->z_shares_dir);
-}
-
-/*
- * Create the '.zfs' directory. This directory is cached as part of the VFS
- * structure. This results in a hold on the vfs_t. The code in zfs_umount()
- * therefore checks against a vfs_count of 2 instead of 1. This reference
- * is removed when the ctldir is destroyed in the unmount.
- */
-void
-zfsctl_create(zfsvfs_t *zfsvfs)
-{
- vnode_t *vp, *rvp;
- zfsctl_node_t *zcp;
- uint64_t crtime[2];
-
- ASSERT(zfsvfs->z_ctldir == NULL);
-
- vp = gfs_root_create(sizeof (zfsctl_node_t), zfsvfs->z_vfs,
- zfsctl_ops_root, ZFSCTL_INO_ROOT, zfsctl_root_entries,
- zfsctl_root_inode_cb, MAXNAMELEN, NULL, NULL);
- zcp = vp->v_data;
- zcp->zc_id = ZFSCTL_INO_ROOT;
-
- VERIFY(VFS_ROOT(zfsvfs->z_vfs, &rvp) == 0);
- VERIFY(0 == sa_lookup(VTOZ(rvp)->z_sa_hdl, SA_ZPL_CRTIME(zfsvfs),
- &crtime, sizeof (crtime)));
- ZFS_TIME_DECODE(&zcp->zc_cmtime, crtime);
- VN_RELE(rvp);
-
- /*
- * We're only faking the fact that we have a root of a filesystem for
- * the sake of the GFS interfaces. Undo the flag manipulation it did
- * for us.
- */
- vp->v_flag &= ~(VROOT | VNOCACHE | VNOMAP | VNOSWAP | VNOMOUNT);
-
- zfsvfs->z_ctldir = vp;
-}
-
-/*
- * Destroy the '.zfs' directory. Only called when the filesystem is unmounted.
- * There might still be more references if we were force unmounted, but only
- * new zfs_inactive() calls can occur and they don't reference .zfs
- */
-void
-zfsctl_destroy(zfsvfs_t *zfsvfs)
-{
- VN_RELE(zfsvfs->z_ctldir);
- zfsvfs->z_ctldir = NULL;
-}
-
-/*
- * Given a root znode, retrieve the associated .zfs directory.
- * Add a hold to the vnode and return it.
- */
-vnode_t *
-zfsctl_root(znode_t *zp)
-{
- ASSERT(zfs_has_ctldir(zp));
- VN_HOLD(zp->z_zfsvfs->z_ctldir);
- return (zp->z_zfsvfs->z_ctldir);
-}
-
-/*
- * Common open routine. Disallow any write access.
- */
-/* ARGSUSED */
-static int
-zfsctl_common_open(vnode_t **vpp, int flags, cred_t *cr, caller_context_t *ct)
-{
- if (flags & FWRITE)
- return (EACCES);
-
- return (0);
-}
-
-/*
- * Common close routine. Nothing to do here.
- */
-/* ARGSUSED */
-static int
-zfsctl_common_close(vnode_t *vpp, int flags, int count, offset_t off,
- cred_t *cr, caller_context_t *ct)
-{
- return (0);
-}
-
-/*
- * Common access routine. Disallow writes.
- */
-/* ARGSUSED */
-static int
-zfsctl_common_access(vnode_t *vp, int mode, int flags, cred_t *cr,
- caller_context_t *ct)
-{
- if (flags & V_ACE_MASK) {
- if (mode & ACE_ALL_WRITE_PERMS)
- return (EACCES);
- } else {
- if (mode & VWRITE)
- return (EACCES);
- }
-
- return (0);
-}
-
-/*
- * Common getattr function. Fill in basic information.
- */
-static void
-zfsctl_common_getattr(vnode_t *vp, vattr_t *vap)
-{
- timestruc_t now;
-
- vap->va_uid = 0;
- vap->va_gid = 0;
- vap->va_rdev = 0;
- /*
- * We are a purely virtual object, so we have no
- * blocksize or allocated blocks.
- */
- vap->va_blksize = 0;
- vap->va_nblocks = 0;
- vap->va_seq = 0;
- vap->va_fsid = vp->v_vfsp->vfs_dev;
- vap->va_mode = S_IRUSR | S_IXUSR | S_IRGRP | S_IXGRP |
- S_IROTH | S_IXOTH;
- vap->va_type = VDIR;
- /*
- * We live in the now (for atime).
- */
- gethrestime(&now);
- vap->va_atime = now;
-}
-
-/*ARGSUSED*/
-static int
-zfsctl_common_fid(vnode_t *vp, fid_t *fidp, caller_context_t *ct)
-{
- zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data;
- zfsctl_node_t *zcp = vp->v_data;
- uint64_t object = zcp->zc_id;
- zfid_short_t *zfid;
- int i;
-
- ZFS_ENTER(zfsvfs);
-
- if (fidp->fid_len < SHORT_FID_LEN) {
- fidp->fid_len = SHORT_FID_LEN;
- ZFS_EXIT(zfsvfs);
- return (ENOSPC);
- }
-
- zfid = (zfid_short_t *)fidp;
-
- zfid->zf_len = SHORT_FID_LEN;
-
- for (i = 0; i < sizeof (zfid->zf_object); i++)
- zfid->zf_object[i] = (uint8_t)(object >> (8 * i));
-
- /* .zfs znodes always have a generation number of 0 */
- for (i = 0; i < sizeof (zfid->zf_gen); i++)
- zfid->zf_gen[i] = 0;
-
- ZFS_EXIT(zfsvfs);
- return (0);
-}
-
-
-/*ARGSUSED*/
-static int
-zfsctl_shares_fid(vnode_t *vp, fid_t *fidp, 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_FID(ZTOV(dzp), fidp, ct);
- VN_RELE(ZTOV(dzp));
- }
-
- ZFS_EXIT(zfsvfs);
- return (error);
-}
-/*
- * .zfs inode namespace
- *
- * We need to generate unique inode numbers for all files and directories
- * within the .zfs pseudo-filesystem. We use the following scheme:
- *
- * ENTRY ZFSCTL_INODE
- * .zfs 1
- * .zfs/snapshot 2
- * .zfs/snapshot/<snap> objectid(snap)
- */
-
-#define ZFSCTL_INO_SNAP(id) (id)
-
-/*
- * Get root directory attributes.
- */
-/* ARGSUSED */
-static int
-zfsctl_root_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_node_t *zcp = vp->v_data;
-
- ZFS_ENTER(zfsvfs);
- vap->va_nodeid = ZFSCTL_INO_ROOT;
- vap->va_nlink = vap->va_size = NROOT_ENTRIES;
- vap->va_mtime = vap->va_ctime = zcp->zc_cmtime;
-
- zfsctl_common_getattr(vp, vap);
- ZFS_EXIT(zfsvfs);
-
- return (0);
-}
-
-/*
- * Special case the handling of "..".
- */
-/* ARGSUSED */
-int
-zfsctl_root_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;
- int err;
-
- /*
- * No extended attributes allowed under .zfs
- */
- if (flags & LOOKUP_XATTR)
- return (EINVAL);
-
- ZFS_ENTER(zfsvfs);
-
- if (strcmp(nm, "..") == 0) {
- err = VFS_ROOT(dvp->v_vfsp, vpp);
- } else {
- err = gfs_vop_lookup(dvp, nm, vpp, pnp, flags, rdir,
- cr, ct, direntflags, realpnp);
- }
-
- ZFS_EXIT(zfsvfs);
-
- return (err);
-}
-
-static int
-zfsctl_pathconf(vnode_t *vp, int cmd, ulong_t *valp, cred_t *cr,
- caller_context_t *ct)
-{
- /*
- * We only care about ACL_ENABLED so that libsec can
- * display ACL correctly and not default to POSIX draft.
- */
- if (cmd == _PC_ACL_ENABLED) {
- *valp = _ACL_ACE_ENABLED;
- return (0);
- }
-
- return (fs_pathconf(vp, cmd, valp, cr, ct));
-}
-
-static const fs_operation_def_t zfsctl_tops_root[] = {
- { VOPNAME_OPEN, { .vop_open = zfsctl_common_open } },
- { VOPNAME_CLOSE, { .vop_close = zfsctl_common_close } },
- { VOPNAME_IOCTL, { .error = fs_inval } },
- { VOPNAME_GETATTR, { .vop_getattr = zfsctl_root_getattr } },
- { 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, 0);
-
- 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, 0);
-
- 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, B_FALSE);
- } 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, NULL,
- B_FALSE, B_FALSE, -1);
- 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_hold(snapname, FTAG, &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_rele(snap, FTAG);
-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;
- vap->va_ctime = vap->va_mtime = dmu_objset_snap_cmtime(zfsvfs->z_os);
- 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);
-}
-#endif /* HAVE_ZPL */
git://git.camperquake.de / zfs.git / commitdiff