/* 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);
}
/* ARGSUSED */
int
zfsctl_snapdir_remove(struct inode *dip, char *name, cred_t *cr, int flags)
{
zfs_sb_t *zsb = ITOZSB(dip);
char *snapname, *real;
int error;
ZFS_ENTER(zsb);
snapname = kmem_alloc(MAXNAMELEN, KM_SLEEP);
real = kmem_alloc(MAXNAMELEN, KM_SLEEP);
if (zsb->z_case == ZFS_CASE_INSENSITIVE) {
error = dmu_snapshot_realname(zsb->z_os, name, real,
MAXNAMELEN, NULL);
if (error == 0) {
name = real;
} else if (error != ENOTSUP) {
goto out;
}
}
error = zfsctl_snapshot_zname(dip, name, MAXNAMELEN, snapname);
if (!error)
error = zfs_secpolicy_destroy_perms(snapname, cr);
if (error)
goto out;
error = zfsctl_unmount_snapshot(zsb, name, MNT_FORCE);
if ((error == 0) || (error == ENOENT))
error = dmu_objset_destroy(snapname, B_FALSE);
out:
kmem_free(snapname, MAXNAMELEN);
kmem_free(real, MAXNAMELEN);
ZFS_EXIT(zsb);
return (error);
}
/*ARGSUSED*/
int
zfsctl_snapdir_rename(struct inode *sdip, char *sname,
struct inode *tdip, char *tname, cred_t *cr, int flags)
{
zfs_sb_t *zsb = ITOZSB(sdip);
zfs_snapentry_t search, *sep;
avl_index_t where;
char *to, *from, *real;
int error;
ZFS_ENTER(zsb);
to = kmem_alloc(MAXNAMELEN, KM_SLEEP);
from = kmem_alloc(MAXNAMELEN, KM_SLEEP);
real = kmem_alloc(MAXNAMELEN, KM_SLEEP);
if (zsb->z_case == ZFS_CASE_INSENSITIVE) {
error = dmu_snapshot_realname(zsb->z_os, sname, real,
MAXNAMELEN, NULL);
if (error == 0) {
sname = real;
} else if (error != ENOTSUP) {
goto out;
}
}
error = zfsctl_snapshot_zname(sdip, sname, MAXNAMELEN, from);
if (!error)
error = zfsctl_snapshot_zname(tdip, tname, MAXNAMELEN, to);
if (!error)
error = zfs_secpolicy_rename_perms(from, to, cr);
if (error)
goto out;
/*
* Cannot move snapshots out of the snapdir.
*/
if (sdip != tdip) {
error = EINVAL;
goto out;
}
/*
* No-op when names are identical.
*/
if (strcmp(sname, tname) == 0) {
error = 0;
goto out;
}
mutex_enter(&zsb->z_ctldir_lock);
error = dmu_objset_rename(from, to, B_FALSE);
if (error)
goto out_unlock;
search.se_name = (char *)sname;
sep = avl_find(&zsb->z_ctldir_snaps, &search, &where);
if (sep)
zfsctl_rename_snap(zsb, sep, tname);
out_unlock:
mutex_exit(&zsb->z_ctldir_lock);
out:
kmem_free(from, MAXNAMELEN);
kmem_free(to, MAXNAMELEN);
kmem_free(real, MAXNAMELEN);
ZFS_EXIT(zsb);
return (error);
}
/* 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_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);
}
