/*
* 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.
* Copyright (c) 2011 Pawel Jakub Dawidek <pawel@dawidek.net>.
* All rights reserved.
* Copyright (c) 2012, 2015 by Delphix. All rights reserved.
* Copyright (c) 2014 Integros [integros.com]
*/
/* Portions Copyright 2010 Robert Milkowski */
#include <sys/types.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/sysmacros.h>
#include <sys/kmem.h>
#include <sys/acl.h>
#include <sys/vnode.h>
#include <sys/vfs.h>
#include <sys/mntent.h>
#include <sys/mount.h>
#include <sys/cmn_err.h>
#include <sys/zfs_znode.h>
#include <sys/zfs_dir.h>
#include <sys/zil.h>
#include <sys/fs/zfs.h>
#include <sys/dmu.h>
#include <sys/dsl_prop.h>
#include <sys/dsl_dataset.h>
#include <sys/dsl_deleg.h>
#include <sys/spa.h>
#include <sys/zap.h>
#include <sys/sa.h>
#include <sys/sa_impl.h>
#include <sys/varargs.h>
#include <sys/policy.h>
#include <sys/atomic.h>
#include <sys/zfs_ioctl.h>
#include <sys/zfs_ctldir.h>
#include <sys/zfs_fuid.h>
#include <sys/sunddi.h>
#include <sys/dnlc.h>
#include <sys/dmu_objset.h>
#include <sys/spa_boot.h>
#include "zfs_comutil.h"
#ifdef __FreeBSD_kernel__
#include <sys/jail.h>
struct mtx zfs_debug_mtx;
MTX_SYSINIT(zfs_debug_mtx, &zfs_debug_mtx, "zfs_debug", MTX_DEF);
SYSCTL_NODE(_vfs, OID_AUTO, zfs, CTLFLAG_RW, 0, "ZFS file system");
int zfs_super_owner;
SYSCTL_INT(_vfs_zfs, OID_AUTO, super_owner, CTLFLAG_RW, &zfs_super_owner, 0,
"File system owner can perform privileged operation on his file systems");
int zfs_debug_level;
SYSCTL_INT(_vfs_zfs, OID_AUTO, debug, CTLFLAG_RWTUN, &zfs_debug_level, 0,
"Debug level");
SYSCTL_NODE(_vfs_zfs, OID_AUTO, version, CTLFLAG_RD, 0, "ZFS versions");
static int zfs_version_acl = ZFS_ACL_VERSION;
SYSCTL_INT(_vfs_zfs_version, OID_AUTO, acl, CTLFLAG_RD, &zfs_version_acl, 0,
"ZFS_ACL_VERSION");
static int zfs_version_spa = SPA_VERSION;
SYSCTL_INT(_vfs_zfs_version, OID_AUTO, spa, CTLFLAG_RD, &zfs_version_spa, 0,
"SPA_VERSION");
static int zfs_version_zpl = ZPL_VERSION;
SYSCTL_INT(_vfs_zfs_version, OID_AUTO, zpl, CTLFLAG_RD, &zfs_version_zpl, 0,
"ZPL_VERSION");
static int zfs_mount(vfs_t *vfsp);
static int zfs_umount(vfs_t *vfsp, int fflag);
static int zfs_root(vfs_t *vfsp, int flags, vnode_t **vpp);
static int zfs_statfs(vfs_t *vfsp, struct statfs *statp);
static int zfs_vget(vfs_t *vfsp, ino_t ino, int flags, vnode_t **vpp);
static int zfs_sync(vfs_t *vfsp, int waitfor);
static int zfs_checkexp(vfs_t *vfsp, struct sockaddr *nam, int *extflagsp,
struct ucred **credanonp, int *numsecflavors, int **secflavors);
static int zfs_fhtovp(vfs_t *vfsp, fid_t *fidp, int flags, vnode_t **vpp);
static void zfs_objset_close(zfsvfs_t *zfsvfs);
static void zfs_freevfs(vfs_t *vfsp);
struct vfsops zfs_vfsops = {
.vfs_mount = zfs_mount,
.vfs_unmount = zfs_umount,
.vfs_root = zfs_root,
.vfs_statfs = zfs_statfs,
.vfs_vget = zfs_vget,
.vfs_sync = zfs_sync,
.vfs_checkexp = zfs_checkexp,
.vfs_fhtovp = zfs_fhtovp,
};
VFS_SET(zfs_vfsops, zfs, VFCF_JAIL | VFCF_DELEGADMIN);
#endif /* __FreeBSD_kernel__ */
#ifdef __NetBSD__
#include <sys/fstrans.h>
#include <sys/mkdev.h>
#include <miscfs/genfs/genfs.h>
int zfs_debug_level;
kmutex_t zfs_debug_mtx;
#define DROP_GIANT() /* nothing */
#define PICKUP_GIANT() /* nothing */
#define vfs_stdsync(a, b) 0
static int zfs_mount(vfs_t *vfsp, const char *path, void *data, size_t *data_len);
static int zfs_umount(vfs_t *vfsp, int fflag);
static int zfs_root(vfs_t *vfsp, int flags, vnode_t **vpp);
static int zfs_statvfs(vfs_t *vfsp, struct statvfs *statp);
static int zfs_netbsd_vptofh(vnode_t *vp, fid_t *fidp, size_t *fh_size);
static int zfs_netbsd_fhtovp(vfs_t *vfsp, fid_t *fidp, int lktype, vnode_t **vpp);
static int zfs_vget(vfs_t *vfsp, ino_t ino, int lktype, vnode_t **vpp);
static int zfs_sync(vfs_t *vfsp, int waitfor);
static int zfs_netbsd_sync(vfs_t *vfsp, int waitfor, cred_t *cr);
static void zfs_freevfs(vfs_t *vfsp);
void zfs_init(void);
void zfs_fini(void);
extern const struct vnodeopv_desc zfs_vnodeop_opv_desc;
extern const struct vnodeopv_desc zfs_specop_opv_desc;
extern const struct vnodeopv_desc zfs_fifoop_opv_desc;
extern const struct vnodeopv_desc zfs_sfsop_opv_desc;
static const struct vnodeopv_desc * const zfs_vnodeop_descs[] = {
&zfs_vnodeop_opv_desc,
&zfs_specop_opv_desc,
&zfs_fifoop_opv_desc,
&zfs_sfsop_opv_desc,
NULL,
};
struct vfsops zfs_vfsops = {
.vfs_name = MOUNT_ZFS,
.vfs_min_mount_data = sizeof(struct zfs_args),
.vfs_opv_descs = zfs_vnodeop_descs,
.vfs_mount = zfs_mount,
.vfs_unmount = zfs_umount,
.vfs_root = zfs_root,
.vfs_statvfs = zfs_statvfs,
.vfs_sync = zfs_netbsd_sync,
.vfs_vget = zfs_vget,
.vfs_loadvnode = zfs_loadvnode,
.vfs_newvnode = zfs_newvnode,
.vfs_init = zfs_init,
.vfs_done = zfs_fini,
.vfs_start = (void *)nullop,
.vfs_renamelock_enter = genfs_renamelock_enter,
.vfs_renamelock_exit = genfs_renamelock_exit,
.vfs_reinit = (void *)nullop,
.vfs_vptofh = zfs_netbsd_vptofh,
.vfs_fhtovp = zfs_netbsd_fhtovp,
.vfs_quotactl = (void *)eopnotsupp,
.vfs_extattrctl = (void *)eopnotsupp,
.vfs_suspendctl = genfs_suspendctl,
.vfs_snapshot = (void *)eopnotsupp,
.vfs_fsync = (void *)eopnotsupp,
};
static bool
zfs_sync_selector(void *cl, struct vnode *vp)
{
znode_t *zp;
/*
* Skip the vnode/inode if inaccessible, is control node or if the
* atime is clean.
*/
if (zfsctl_is_node(vp))
return false;
zp = VTOZ(vp);
return zp != NULL && vp->v_type != VNON && zp->z_atime_dirty != 0
&& !zp->z_unlinked;
}
static int
zfs_netbsd_sync(vfs_t *vfsp, int waitfor, cred_t *cr)
{
struct vnode_iterator *marker;
zfsvfs_t *zfsvfs = vfsp->vfs_data;
vnode_t *vp;
/*
* On NetBSD, we need to push out atime updates. Solaris does
* this during VOP_INACTIVE, but that does not work well with the
* BSD VFS, so we do it in batch here.
*/
vfs_vnode_iterator_init(vfsp, &marker);
while ((vp = vfs_vnode_iterator_next(marker, zfs_sync_selector, NULL)))
{
znode_t *zp;
dmu_buf_t *dbp;
dmu_tx_t *tx;
int error;
error = vn_lock(vp, LK_EXCLUSIVE);
if (error) {
VN_RELE(vp);
continue;
}
ZFS_ENTER(zfsvfs);
zp = VTOZ(vp);
tx = dmu_tx_create(zfsvfs->z_os);
dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
zfs_sa_upgrade_txholds(tx, zp);
error = dmu_tx_assign(tx, TXG_WAIT);
if (error) {
dmu_tx_abort(tx);
} else {
(void) sa_update(zp->z_sa_hdl, SA_ZPL_ATIME(zfsvfs),
(void *)&zp->z_atime, sizeof (zp->z_atime), tx);
zp->z_atime_dirty = 0;
dmu_tx_commit(tx);
}
ZFS_EXIT(zfsvfs);
vput(vp);
}
vfs_vnode_iterator_destroy(marker);
/*
* Then do the regular ZFS stuff.
*/
return zfs_sync(vfsp, waitfor);
}
static int
zfs_netbsd_vptofh(vnode_t *vp, fid_t *fidp, size_t *fh_size)
{
znode_t *zp;
zfsvfs_t *zfsvfs;
uint32_t gen;
uint64_t gen64;
uint64_t object;
zfid_short_t *zfid;
int size, i, error;
if (zfsctl_is_node(vp))
return zfsctl_vptofh(vp, fidp, fh_size);
zp = VTOZ(vp);
zfsvfs = zp->z_zfsvfs;
object = zp->z_id;
ZFS_ENTER(zfsvfs);
ZFS_VERIFY_ZP(zp);
if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_GEN(zfsvfs),
&gen64, sizeof (uint64_t))) != 0) {
ZFS_EXIT(zfsvfs);
return (error);
}
gen = (uint32_t)gen64;
size = (zfsvfs->z_parent != zfsvfs) ? LONG_FID_LEN : SHORT_FID_LEN;
if (*fh_size < size) {
ZFS_EXIT(zfsvfs);
*fh_size = size;
return SET_ERROR(E2BIG);
}
*fh_size = size;
zfid = (zfid_short_t *)fidp;
zfid->zf_len = size;
for (i = 0; i < sizeof (zfid->zf_object); i++)
zfid->zf_object[i] = (uint8_t)(object >> (8 * i));
/* Must have a non-zero generation number to distinguish from .zfs */
if (gen == 0)
gen = 1;
for (i = 0; i < sizeof (zfid->zf_gen); i++)
zfid->zf_gen[i] = (uint8_t)(gen >> (8 * i));
if (size == LONG_FID_LEN) {
uint64_t objsetid = dmu_objset_id(zfsvfs->z_os);
zfid_long_t *zlfid;
zlfid = (zfid_long_t *)fidp;
for (i = 0; i < sizeof (zlfid->zf_setid); i++)
zlfid->zf_setid[i] = (uint8_t)(objsetid >> (8 * i));
/* XXX - this should be the generation number for the objset */
for (i = 0; i < sizeof (zlfid->zf_setgen); i++)
zlfid->zf_setgen[i] = 0;
}
ZFS_EXIT(zfsvfs);
return 0;
}
static int
zfs_netbsd_fhtovp(vfs_t *vfsp, fid_t *fidp, int lktype, vnode_t **vpp)
{
zfsvfs_t *zfsvfs = vfsp->vfs_data;
znode_t *zp;
vnode_t *dvp;
uint64_t object = 0;
uint64_t fid_gen = 0;
uint64_t gen_mask;
uint64_t zp_gen;
int i, err;
*vpp = NULL;
ZFS_ENTER(zfsvfs);
if (zfsvfs->z_parent == zfsvfs && fidp->fid_len == LONG_FID_LEN) {
zfid_long_t *zlfid = (zfid_long_t *)fidp;
uint64_t objsetid = 0;
uint64_t setgen = 0;
for (i = 0; i < sizeof (zlfid->zf_setid); i++)
objsetid |= ((uint64_t)zlfid->zf_setid[i]) << (8 * i);
for (i = 0; i < sizeof (zlfid->zf_setgen); i++)
setgen |= ((uint64_t)zlfid->zf_setgen[i]) << (8 * i);
ZFS_EXIT(zfsvfs);
err = zfsctl_lookup_objset(vfsp, objsetid, &zfsvfs);
if (err)
return (SET_ERROR(EINVAL));
ZFS_ENTER(zfsvfs);
}
if (fidp->fid_len == SHORT_FID_LEN || fidp->fid_len == LONG_FID_LEN) {
zfid_short_t *zfid = (zfid_short_t *)fidp;
for (i = 0; i < sizeof (zfid->zf_object); i++)
object |= ((uint64_t)zfid->zf_object[i]) << (8 * i);
for (i = 0; i < sizeof (zfid->zf_gen); i++)
fid_gen |= ((uint64_t)zfid->zf_gen[i]) << (8 * i);
} else {
ZFS_EXIT(zfsvfs);
return (SET_ERROR(EINVAL));
}
/* A zero fid_gen means we are in the .zfs control directories */
if (fid_gen == 0 &&
(object == ZFSCTL_INO_ROOT || object == ZFSCTL_INO_SNAPDIR)) {
ZFS_EXIT(zfsvfs);
if (object == ZFSCTL_INO_ROOT)
err = zfsctl_root(zfsvfs, vpp);
else
err = zfsctl_snapshot(zfsvfs, vpp);
if (err)
return err;
err = vn_lock(*vpp, LK_EXCLUSIVE);
if (err) {
vrele(*vpp);
*vpp = NULL;
return err;
}
return 0;
}
gen_mask = -1ULL >> (64 - 8 * i);
dprintf("getting %llu [%u mask %llx]\n", object, fid_gen, gen_mask);
if (err = zfs_zget(zfsvfs, object, &zp)) {
ZFS_EXIT(zfsvfs);
return SET_ERROR(ESTALE);
}
(void) sa_lookup(zp->z_sa_hdl, SA_ZPL_GEN(zfsvfs), &zp_gen,
sizeof (uint64_t));
zp_gen = zp_gen & gen_mask;
if (zp_gen == 0)
zp_gen = 1;
if (zp->z_unlinked || zp_gen != fid_gen) {
dprintf("znode gen (%u) != fid gen (%u)\n", zp_gen, fid_gen);
VN_RELE(ZTOV(zp));
ZFS_EXIT(zfsvfs);
return SET_ERROR(ESTALE);
}
*vpp = ZTOV(zp);
ZFS_EXIT(zfsvfs);
err = vn_lock(*vpp, lktype);
if (err) {
vrele(*vpp);
*vpp = NULL;
return err;
}
return 0;
}
#endif /* __NetBSD__ */
/*
* We need to keep a count of active fs's.
* This is necessary to prevent our module
* from being unloaded after a umount -f
*/
static uint32_t zfs_active_fs_count = 0;
/*ARGSUSED*/
static int
zfs_sync(vfs_t *vfsp, int waitfor)
{
/*
* Data integrity is job one. We don't want a compromised kernel
* writing to the storage pool, so we never sync during panic.
*/
if (panicstr)
return (0);
/*
* Ignore the system syncher. ZFS already commits async data
* at zfs_txg_timeout intervals.
*/
if (waitfor == MNT_LAZY)
return (0);
if (vfsp != NULL) {
/*
* Sync a specific filesystem.
*/
zfsvfs_t *zfsvfs = vfsp->vfs_data;
dsl_pool_t *dp;
int error;
error = vfs_stdsync(vfsp, waitfor);
if (error != 0)
return (error);
ZFS_ENTER(zfsvfs);
dp = dmu_objset_pool(zfsvfs->z_os);
/*
* If the system is shutting down, then skip any
* filesystems which may exist on a suspended pool.
*/
if (sys_shutdown && spa_suspended(dp->dp_spa)) {
ZFS_EXIT(zfsvfs);
return (0);
}
if (zfsvfs->z_log != NULL)
zil_commit(zfsvfs->z_log, 0);
ZFS_EXIT(zfsvfs);
} else {
/*
* Sync all ZFS filesystems. This is what happens when you
* run sync(1M). Unlike other filesystems, ZFS honors the
* request by waiting for all pools to commit all dirty data.
*/
spa_sync_allpools();
}
return (0);
}
#ifdef illumos
static int
zfs_create_unique_device(dev_t *dev)
{
major_t new_major;
do {
ASSERT3U(zfs_minor, <=, MAXMIN32);
minor_t start = zfs_minor;
do {
mutex_enter(&zfs_dev_mtx);
if (zfs_minor >= MAXMIN32) {
/*
* If we're still using the real major
* keep out of /dev/zfs and /dev/zvol minor
* number space. If we're using a getudev()'ed
* major number, we can use all of its minors.
*/
if (zfs_major == ddi_name_to_major(ZFS_DRIVER))
zfs_minor = ZFS_MIN_MINOR;
else
zfs_minor = 0;
} else {
zfs_minor++;
}
*dev = makedevice(zfs_major, zfs_minor);
mutex_exit(&zfs_dev_mtx);
} while (vfs_devismounted(*dev) && zfs_minor != start);
#ifdef illumos
if (zfs_minor == start) {
/*
* We are using all ~262,000 minor numbers for the
* current major number. Create a new major number.
*/
if ((new_major = getudev()) == (major_t)-1) {
cmn_err(CE_WARN,
"zfs_mount: Can't get unique major "
"device number.");
return (-1);
}
mutex_enter(&zfs_dev_mtx);
zfs_major = new_major;
zfs_minor = 0;
mutex_exit(&zfs_dev_mtx);
} else {
break;
}
/* CONSTANTCONDITION */
#endif
} while (1);
return (0);
}
#endif /* illumos */
static void
atime_changed_cb(void *arg, uint64_t newval)
{
zfsvfs_t *zfsvfs = arg;
if (newval == TRUE) {
zfsvfs->z_atime = TRUE;
zfsvfs->z_vfs->vfs_flag &= ~MNT_NOATIME;
vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NOATIME);
vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_ATIME, NULL, 0);
} else {
zfsvfs->z_atime = FALSE;
zfsvfs->z_vfs->vfs_flag |= MNT_NOATIME;
vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_ATIME);
vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NOATIME, NULL, 0);
}
}
static void
xattr_changed_cb(void *arg, uint64_t newval)
{
zfsvfs_t *zfsvfs = arg;
if (newval == TRUE) {
/* XXX locking on vfs_flag? */
#ifdef TODO
zfsvfs->z_vfs->vfs_flag |= VFS_XATTR;
#endif
vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NOXATTR);
vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_XATTR, NULL, 0);
} else {
/* XXX locking on vfs_flag? */
#ifdef TODO
zfsvfs->z_vfs->vfs_flag &= ~VFS_XATTR;
#endif
vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_XATTR);
vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NOXATTR, NULL, 0);
}
}
static void
blksz_changed_cb(void *arg, uint64_t newval)
{
zfsvfs_t *zfsvfs = arg;
ASSERT3U(newval, <=, spa_maxblocksize(dmu_objset_spa(zfsvfs->z_os)));
ASSERT3U(newval, >=, SPA_MINBLOCKSIZE);
ASSERT(ISP2(newval));
zfsvfs->z_max_blksz = newval;
zfsvfs->z_vfs->mnt_stat.f_iosize = newval;
}
static void
readonly_changed_cb(void *arg, uint64_t newval)
{
zfsvfs_t *zfsvfs = arg;
if (newval) {
/* XXX locking on vfs_flag? */
zfsvfs->z_vfs->vfs_flag |= VFS_RDONLY;
vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_RW);
vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_RO, NULL, 0);
} else {
/* XXX locking on vfs_flag? */
zfsvfs->z_vfs->vfs_flag &= ~VFS_RDONLY;
vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_RO);
vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_RW, NULL, 0);
}
}
static void
setuid_changed_cb(void *arg, uint64_t newval)
{
zfsvfs_t *zfsvfs = arg;
if (newval == FALSE) {
zfsvfs->z_vfs->vfs_flag |= VFS_NOSETUID;
vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_SETUID);
vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NOSETUID, NULL, 0);
} else {
zfsvfs->z_vfs->vfs_flag &= ~VFS_NOSETUID;
vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NOSETUID);
vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_SETUID, NULL, 0);
}
}
static void
exec_changed_cb(void *arg, uint64_t newval)
{
zfsvfs_t *zfsvfs = arg;
if (newval == FALSE) {
zfsvfs->z_vfs->vfs_flag |= VFS_NOEXEC;
vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_EXEC);
vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NOEXEC, NULL, 0);
} else {
zfsvfs->z_vfs->vfs_flag &= ~VFS_NOEXEC;
vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NOEXEC);
vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_EXEC, NULL, 0);
}
}
/*
* The nbmand mount option can be changed at mount time.
* We can't allow it to be toggled on live file systems or incorrect
* behavior may be seen from cifs clients
*
* This property isn't registered via dsl_prop_register(), but this callback
* will be called when a file system is first mounted
*/
static void
nbmand_changed_cb(void *arg, uint64_t newval)
{
zfsvfs_t *zfsvfs = arg;
if (newval == FALSE) {
vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NBMAND);
vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NONBMAND, NULL, 0);
} else {
vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NONBMAND);
vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NBMAND, NULL, 0);
}
}
static void
snapdir_changed_cb(void *arg, uint64_t newval)
{
zfsvfs_t *zfsvfs = arg;
zfsvfs->z_show_ctldir = newval;
}
static void
vscan_changed_cb(void *arg, uint64_t newval)
{
zfsvfs_t *zfsvfs = arg;
zfsvfs->z_vscan = newval;
}
static void
acl_mode_changed_cb(void *arg, uint64_t newval)
{
zfsvfs_t *zfsvfs = arg;
zfsvfs->z_acl_mode = newval;
}
static void
acl_inherit_changed_cb(void *arg, uint64_t newval)
{
zfsvfs_t *zfsvfs = arg;
zfsvfs->z_acl_inherit = newval;
}
static int
zfs_register_callbacks(vfs_t *vfsp)
{
struct dsl_dataset *ds = NULL;
objset_t *os = NULL;
zfsvfs_t *zfsvfs = NULL;
uint64_t nbmand;
boolean_t readonly = B_FALSE;
boolean_t do_readonly = B_FALSE;
boolean_t setuid = B_FALSE;
boolean_t do_setuid = B_FALSE;
boolean_t exec = B_FALSE;
boolean_t do_exec = B_FALSE;
#ifdef illumos
boolean_t devices = B_FALSE;
boolean_t do_devices = B_FALSE;
#endif
boolean_t xattr = B_FALSE;
boolean_t do_xattr = B_FALSE;
boolean_t atime = B_FALSE;
boolean_t do_atime = B_FALSE;
int error = 0;
ASSERT(vfsp);
zfsvfs = vfsp->vfs_data;
ASSERT(zfsvfs);
os = zfsvfs->z_os;
/*
* This function can be called for a snapshot when we update snapshot's
* mount point, which isn't really supported.
*/
if (dmu_objset_is_snapshot(os))
return (EOPNOTSUPP);
/*
* The act of registering our callbacks will destroy any mount
* options we may have. In order to enable temporary overrides
* of mount options, we stash away the current values and
* restore them after we register the callbacks.
*/
if (vfs_optionisset(vfsp, MNTOPT_RO, NULL) ||
!spa_writeable(dmu_objset_spa(os))) {
readonly = B_TRUE;
do_readonly = B_TRUE;
} else if (vfs_optionisset(vfsp, MNTOPT_RW, NULL)) {
readonly = B_FALSE;
do_readonly = B_TRUE;
}
if (vfs_optionisset(vfsp, MNTOPT_NOSUID, NULL)) {
setuid = B_FALSE;
do_setuid = B_TRUE;
} else {
if (vfs_optionisset(vfsp, MNTOPT_NOSETUID, NULL)) {
setuid = B_FALSE;
do_setuid = B_TRUE;
} else if (vfs_optionisset(vfsp, MNTOPT_SETUID, NULL)) {
setuid = B_TRUE;
do_setuid = B_TRUE;
}
}
if (vfs_optionisset(vfsp, MNTOPT_NOEXEC, NULL)) {
exec = B_FALSE;
do_exec = B_TRUE;
} else if (vfs_optionisset(vfsp, MNTOPT_EXEC, NULL)) {
exec = B_TRUE;
do_exec = B_TRUE;
}
if (vfs_optionisset(vfsp, MNTOPT_NOXATTR, NULL)) {
xattr = B_FALSE;
do_xattr = B_TRUE;
} else if (vfs_optionisset(vfsp, MNTOPT_XATTR, NULL)) {
xattr = B_TRUE;
do_xattr = B_TRUE;
}
if (vfs_optionisset(vfsp, MNTOPT_NOATIME, NULL)) {
atime = B_FALSE;
do_atime = B_TRUE;
} else if (vfs_optionisset(vfsp, MNTOPT_ATIME, NULL)) {
atime = B_TRUE;
do_atime = B_TRUE;
}
/*
* We need to enter pool configuration here, so that we can use
* dsl_prop_get_int_ds() to handle the special nbmand property below.
* dsl_prop_get_integer() can not be used, because it has to acquire
* spa_namespace_lock and we can not do that because we already hold
* z_teardown_lock. The problem is that spa_config_sync() is called
* with spa_namespace_lock held and the function calls ZFS vnode
* operations to write the cache file and thus z_teardown_lock is
* acquired after spa_namespace_lock.
*/
ds = dmu_objset_ds(os);
dsl_pool_config_enter(dmu_objset_pool(os), FTAG);
/*
* nbmand is a special property. It can only be changed at
* mount time.
*
* This is weird, but it is documented to only be changeable
* at mount time.
*/
if (vfs_optionisset(vfsp, MNTOPT_NONBMAND, NULL)) {
nbmand = B_FALSE;
} else if (vfs_optionisset(vfsp, MNTOPT_NBMAND, NULL)) {
nbmand = B_TRUE;
} else if (error = dsl_prop_get_int_ds(ds, "nbmand", &nbmand) != 0) {
dsl_pool_config_exit(dmu_objset_pool(os), FTAG);
return (error);
}
/*
* Register property callbacks.
*
* It would probably be fine to just check for i/o error from
* the first prop_register(), but I guess I like to go
* overboard...
*/
error = dsl_prop_register(ds,
zfs_prop_to_name(ZFS_PROP_ATIME), atime_changed_cb, zfsvfs);
error = error ? error : dsl_prop_register(ds,
zfs_prop_to_name(ZFS_PROP_XATTR), xattr_changed_cb, zfsvfs);
error = error ? error : dsl_prop_register(ds,
zfs_prop_to_name(ZFS_PROP_RECORDSIZE), blksz_changed_cb, zfsvfs);
error = error ? error : dsl_prop_register(ds,
zfs_prop_to_name(ZFS_PROP_READONLY), readonly_changed_cb, zfsvfs);
#ifdef illumos
error = error ? error : dsl_prop_register(ds,
zfs_prop_to_name(ZFS_PROP_DEVICES), devices_changed_cb, zfsvfs);
#endif
error = error ? error : dsl_prop_register(ds,
zfs_prop_to_name(ZFS_PROP_SETUID), setuid_changed_cb, zfsvfs);
error = error ? error : dsl_prop_register(ds,
zfs_prop_to_name(ZFS_PROP_EXEC), exec_changed_cb, zfsvfs);
error = error ? error : dsl_prop_register(ds,
zfs_prop_to_name(ZFS_PROP_SNAPDIR), snapdir_changed_cb, zfsvfs);
error = error ? error : dsl_prop_register(ds,
zfs_prop_to_name(ZFS_PROP_ACLMODE), acl_mode_changed_cb, zfsvfs);
error = error ? error : dsl_prop_register(ds,
zfs_prop_to_name(ZFS_PROP_ACLINHERIT), acl_inherit_changed_cb,
zfsvfs);
error = error ? error : dsl_prop_register(ds,
zfs_prop_to_name(ZFS_PROP_VSCAN), vscan_changed_cb, zfsvfs);
dsl_pool_config_exit(dmu_objset_pool(os), FTAG);
if (error)
goto unregister;
/*
* Invoke our callbacks to restore temporary mount options.
*/
if (do_readonly)
readonly_changed_cb(zfsvfs, readonly);
if (do_setuid)
setuid_changed_cb(zfsvfs, setuid);
if (do_exec)
exec_changed_cb(zfsvfs, exec);
if (do_xattr)
xattr_changed_cb(zfsvfs, xattr);
if (do_atime)
atime_changed_cb(zfsvfs, atime);
nbmand_changed_cb(zfsvfs, nbmand);
return (0);
unregister:
dsl_prop_unregister_all(ds, zfsvfs);
return (error);
}
static int
zfs_space_delta_cb(dmu_object_type_t bonustype, void *data,
uint64_t *userp, uint64_t *groupp)
{
/*
* Is it a valid type of object to track?
*/
if (bonustype != DMU_OT_ZNODE && bonustype != DMU_OT_SA)
return (SET_ERROR(ENOENT));
/*
* If we have a NULL data pointer
* then assume the id's aren't changing and
* return EEXIST to the dmu to let it know to
* use the same ids
*/
if (data == NULL)
return (SET_ERROR(EEXIST));
if (bonustype == DMU_OT_ZNODE) {
znode_phys_t *znp = data;
*userp = znp->zp_uid;
*groupp = znp->zp_gid;
} else {
int hdrsize;
sa_hdr_phys_t *sap = data;
sa_hdr_phys_t sa = *sap;
boolean_t swap = B_FALSE;
ASSERT(bonustype == DMU_OT_SA);
if (sa.sa_magic == 0) {
/*
* This should only happen for newly created
* files that haven't had the znode data filled
* in yet.
*/
*userp = 0;
*groupp = 0;
return (0);
}
if (sa.sa_magic == BSWAP_32(SA_MAGIC)) {
sa.sa_magic = SA_MAGIC;
sa.sa_layout_info = BSWAP_16(sa.sa_layout_info);
swap = B_TRUE;
} else {
VERIFY3U(sa.sa_magic, ==, SA_MAGIC);
}
hdrsize = sa_hdrsize(&sa);
VERIFY3U(hdrsize, >=, sizeof (sa_hdr_phys_t));
*userp = *((uint64_t *)((uintptr_t)data + hdrsize +
SA_UID_OFFSET));
*groupp = *((uint64_t *)((uintptr_t)data + hdrsize +
SA_GID_OFFSET));
if (swap) {
*userp = BSWAP_64(*userp);
*groupp = BSWAP_64(*groupp);
}
}
return (0);
}
static void
fuidstr_to_sid(zfsvfs_t *zfsvfs, const char *fuidstr,
char *domainbuf, int buflen, uid_t *ridp)
{
uint64_t fuid;
const char *domain;
fuid = strtonum(fuidstr, NULL);
domain = zfs_fuid_find_by_idx(zfsvfs, FUID_INDEX(fuid));
if (domain)
(void) strlcpy(domainbuf, domain, buflen);
else
domainbuf[0] = '\0';
*ridp = FUID_RID(fuid);
}
static uint64_t
zfs_userquota_prop_to_obj(zfsvfs_t *zfsvfs, zfs_userquota_prop_t type)
{
switch (type) {
case ZFS_PROP_USERUSED:
return (DMU_USERUSED_OBJECT);
case ZFS_PROP_GROUPUSED:
return (DMU_GROUPUSED_OBJECT);
case ZFS_PROP_USERQUOTA:
return (zfsvfs->z_userquota_obj);
case ZFS_PROP_GROUPQUOTA:
return (zfsvfs->z_groupquota_obj);
}
return (0);
}
int
zfs_userspace_many(zfsvfs_t *zfsvfs, zfs_userquota_prop_t type,
uint64_t *cookiep, void *vbuf, uint64_t *bufsizep)
{
int error;
zap_cursor_t zc;
zap_attribute_t za;
zfs_useracct_t *buf = vbuf;
uint64_t obj;
if (!dmu_objset_userspace_present(zfsvfs->z_os))
return (SET_ERROR(ENOTSUP));
obj = zfs_userquota_prop_to_obj(zfsvfs, type);
if (obj == 0) {
*bufsizep = 0;
return (0);
}
for (zap_cursor_init_serialized(&zc, zfsvfs->z_os, obj, *cookiep);
(error = zap_cursor_retrieve(&zc, &za)) == 0;
zap_cursor_advance(&zc)) {
if ((uintptr_t)buf - (uintptr_t)vbuf + sizeof (zfs_useracct_t) >
*bufsizep)
break;
fuidstr_to_sid(zfsvfs, za.za_name,
buf->zu_domain, sizeof (buf->zu_domain), &buf->zu_rid);
buf->zu_space = za.za_first_integer;
buf++;
}
if (error == ENOENT)
error = 0;
ASSERT3U((uintptr_t)buf - (uintptr_t)vbuf, <=, *bufsizep);
*bufsizep = (uintptr_t)buf - (uintptr_t)vbuf;
*cookiep = zap_cursor_serialize(&zc);
zap_cursor_fini(&zc);
return (error);
}
/*
* buf must be big enough (eg, 32 bytes)
*/
static int
id_to_fuidstr(zfsvfs_t *zfsvfs, const char *domain, uid_t rid,
char *buf, boolean_t addok)
{
uint64_t fuid;
int domainid = 0;
if (domain && domain[0]) {
domainid = zfs_fuid_find_by_domain(zfsvfs, domain, NULL, addok);
if (domainid == -1)
return (SET_ERROR(ENOENT));
}
fuid = FUID_ENCODE(domainid, rid);
(void) sprintf(buf, "%llx", (longlong_t)fuid);
return (0);
}
int
zfs_userspace_one(zfsvfs_t *zfsvfs, zfs_userquota_prop_t type,
const char *domain, uint64_t rid, uint64_t *valp)
{
char buf[32];
int err;
uint64_t obj;
*valp = 0;
if (!dmu_objset_userspace_present(zfsvfs->z_os))
return (SET_ERROR(ENOTSUP));
obj = zfs_userquota_prop_to_obj(zfsvfs, type);
if (obj == 0)
return (0);
err = id_to_fuidstr(zfsvfs, domain, rid, buf, B_FALSE);
if (err)
return (err);
err = zap_lookup(zfsvfs->z_os, obj, buf, 8, 1, valp);
if (err == ENOENT)
err = 0;
return (err);
}
int
zfs_set_userquota(zfsvfs_t *zfsvfs, zfs_userquota_prop_t type,
const char *domain, uint64_t rid, uint64_t quota)
{
char buf[32];
int err;
dmu_tx_t *tx;
uint64_t *objp;
boolean_t fuid_dirtied;
if (type != ZFS_PROP_USERQUOTA && type != ZFS_PROP_GROUPQUOTA)
return (SET_ERROR(EINVAL));
if (zfsvfs->z_version < ZPL_VERSION_USERSPACE)
return (SET_ERROR(ENOTSUP));
objp = (type == ZFS_PROP_USERQUOTA) ? &zfsvfs->z_userquota_obj :
&zfsvfs->z_groupquota_obj;
err = id_to_fuidstr(zfsvfs, domain, rid, buf, B_TRUE);
if (err)
return (err);
fuid_dirtied = zfsvfs->z_fuid_dirty;
tx = dmu_tx_create(zfsvfs->z_os);
dmu_tx_hold_zap(tx, *objp ? *objp : DMU_NEW_OBJECT, B_TRUE, NULL);
if (*objp == 0) {
dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, B_TRUE,
zfs_userquota_prop_prefixes[type]);
}
if (fuid_dirtied)
zfs_fuid_txhold(zfsvfs, tx);
err = dmu_tx_assign(tx, TXG_WAIT);
if (err) {
dmu_tx_abort(tx);
return (err);
}
mutex_enter(&zfsvfs->z_lock);
if (*objp == 0) {
*objp = zap_create(zfsvfs->z_os, DMU_OT_USERGROUP_QUOTA,
DMU_OT_NONE, 0, tx);
VERIFY(0 == zap_add(zfsvfs->z_os, MASTER_NODE_OBJ,
zfs_userquota_prop_prefixes[type], 8, 1, objp, tx));
}
mutex_exit(&zfsvfs->z_lock);
if (quota == 0) {
err = zap_remove(zfsvfs->z_os, *objp, buf, tx);
if (err == ENOENT)
err = 0;
} else {
err = zap_update(zfsvfs->z_os, *objp, buf, 8, 1, "a, tx);
}
ASSERT(err == 0);
if (fuid_dirtied)
zfs_fuid_sync(zfsvfs, tx);
dmu_tx_commit(tx);
return (err);
}
boolean_t
zfs_fuid_overquota(zfsvfs_t *zfsvfs, boolean_t isgroup, uint64_t fuid)
{
char buf[32];
uint64_t used, quota, usedobj, quotaobj;
int err;
usedobj = isgroup ? DMU_GROUPUSED_OBJECT : DMU_USERUSED_OBJECT;
quotaobj = isgroup ? zfsvfs->z_groupquota_obj : zfsvfs->z_userquota_obj;
if (quotaobj == 0 || zfsvfs->z_replay)
return (B_FALSE);
(void) sprintf(buf, "%llx", (longlong_t)fuid);
err = zap_lookup(zfsvfs->z_os, quotaobj, buf, 8, 1, "a);
if (err != 0)
return (B_FALSE);
err = zap_lookup(zfsvfs->z_os, usedobj, buf, 8, 1, &used);
if (err != 0)
return (B_FALSE);
return (used >= quota);
}
boolean_t
zfs_owner_overquota(zfsvfs_t *zfsvfs, znode_t *zp, boolean_t isgroup)
{
uint64_t fuid;
uint64_t quotaobj;
quotaobj = isgroup ? zfsvfs->z_groupquota_obj : zfsvfs->z_userquota_obj;
fuid = isgroup ? zp->z_gid : zp->z_uid;
if (quotaobj == 0 || zfsvfs->z_replay)
return (B_FALSE);
return (zfs_fuid_overquota(zfsvfs, isgroup, fuid));
}
/*
* Associate this zfsvfs with the given objset, which must be owned.
* This will cache a bunch of on-disk state from the objset in the
* zfsvfs.
*/
static int
zfsvfs_init(zfsvfs_t *zfsvfs, objset_t *os)
{
int error;
uint64_t val;
zfsvfs->z_max_blksz = SPA_OLD_MAXBLOCKSIZE;
zfsvfs->z_show_ctldir = ZFS_SNAPDIR_VISIBLE;
zfsvfs->z_os = os;
error = zfs_get_zplprop(os, ZFS_PROP_VERSION, &zfsvfs->z_version);
if (error != 0)
return (error);
if (zfsvfs->z_version >
zfs_zpl_version_map(spa_version(dmu_objset_spa(os)))) {
(void) printf("Can't mount a version %lld file system "
"on a version %lld pool\n. Pool must be upgraded to mount "
"this file system.", (u_longlong_t)zfsvfs->z_version,
(u_longlong_t)spa_version(dmu_objset_spa(os)));
return (SET_ERROR(ENOTSUP));
}
error = zfs_get_zplprop(os, ZFS_PROP_NORMALIZE, &val);
if (error != 0)
return (error);
zfsvfs->z_norm = (int)val;
error = zfs_get_zplprop(os, ZFS_PROP_UTF8ONLY, &val);
if (error != 0)
return (error);
zfsvfs->z_utf8 = (val != 0);
error = zfs_get_zplprop(os, ZFS_PROP_CASE, &val);
if (error != 0)
return (error);
zfsvfs->z_case = (uint_t)val;
/*
* Fold case on file systems that are always or sometimes case
* insensitive.
*/
if (zfsvfs->z_case == ZFS_CASE_INSENSITIVE ||
zfsvfs->z_case == ZFS_CASE_MIXED)
zfsvfs->z_norm |= U8_TEXTPREP_TOUPPER;
zfsvfs->z_use_fuids = USE_FUIDS(zfsvfs->z_version, zfsvfs->z_os);
zfsvfs->z_use_sa = USE_SA(zfsvfs->z_version, zfsvfs->z_os);
uint64_t sa_obj = 0;
if (zfsvfs->z_use_sa) {
/* should either have both of these objects or none */
error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_SA_ATTRS, 8, 1,
&sa_obj);
if (error != 0)
return (error);
}
error = sa_setup(os, sa_obj, zfs_attr_table, ZPL_END,
&zfsvfs->z_attr_table);
if (error != 0)
return (error);
if (zfsvfs->z_version >= ZPL_VERSION_SA)
sa_register_update_callback(os, zfs_sa_upgrade);
error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_ROOT_OBJ, 8, 1,
&zfsvfs->z_root);
if (error != 0)
return (error);
ASSERT(zfsvfs->z_root != 0);
error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_UNLINKED_SET, 8, 1,
&zfsvfs->z_unlinkedobj);
if (error != 0)
return (error);
error = zap_lookup(os, MASTER_NODE_OBJ,
zfs_userquota_prop_prefixes[ZFS_PROP_USERQUOTA],
8, 1, &zfsvfs->z_userquota_obj);
if (error == ENOENT)
zfsvfs->z_userquota_obj = 0;
else if (error != 0)
return (error);
error = zap_lookup(os, MASTER_NODE_OBJ,
zfs_userquota_prop_prefixes[ZFS_PROP_GROUPQUOTA],
8, 1, &zfsvfs->z_groupquota_obj);
if (error == ENOENT)
zfsvfs->z_groupquota_obj = 0;
else if (error != 0)
return (error);
error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_FUID_TABLES, 8, 1,
&zfsvfs->z_fuid_obj);
if (error == ENOENT)
zfsvfs->z_fuid_obj = 0;
else if (error != 0)
return (error);
error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_SHARES_DIR, 8, 1,
&zfsvfs->z_shares_dir);
if (error == ENOENT)
zfsvfs->z_shares_dir = 0;
else if (error != 0)
return (error);
/*
* Only use the name cache if we are looking for a
* name on a file system that does not require normalization
* or case folding. We can also look there if we happen to be
* on a non-normalizing, mixed sensitivity file system IF we
* are looking for the exact name (which is always the case on
* FreeBSD).
*/
zfsvfs->z_use_namecache = !zfsvfs->z_norm ||
((zfsvfs->z_case == ZFS_CASE_MIXED) &&
!(zfsvfs->z_norm & ~U8_TEXTPREP_TOUPPER));
return (0);
}
int
zfsvfs_create(const char *osname, zfsvfs_t **zfvp)
{
objset_t *os;
zfsvfs_t *zfsvfs;
int error;
/*
* XXX: Fix struct statfs so this isn't necessary!
*
* The 'osname' is used as the filesystem's special node, which means
* it must fit in statfs.f_mntfromname, or else it can't be
* enumerated, so libzfs_mnttab_find() returns NULL, which causes
* 'zfs unmount' to think it's not mounted when it is.
*/
if (strlen(osname) >= MNAMELEN)
return (SET_ERROR(ENAMETOOLONG));
zfsvfs = kmem_zalloc(sizeof (zfsvfs_t), KM_SLEEP);
/*
* We claim to always be readonly so we can open snapshots;
* other ZPL code will prevent us from writing to snapshots.
*/
error = dmu_objset_own(osname, DMU_OST_ZFS, B_TRUE, zfsvfs, &os);
if (error) {
kmem_free(zfsvfs, sizeof (zfsvfs_t));
return (error);
}
zfsvfs->z_vfs = NULL;
zfsvfs->z_parent = zfsvfs;
mutex_init(&zfsvfs->z_znodes_lock, NULL, MUTEX_DEFAULT, NULL);
mutex_init(&zfsvfs->z_lock, NULL, MUTEX_DEFAULT, NULL);
list_create(&zfsvfs->z_all_znodes, sizeof (znode_t),
offsetof(znode_t, z_link_node));
#ifdef DIAGNOSTIC
rrm_init(&zfsvfs->z_teardown_lock, B_TRUE);
#else
rrm_init(&zfsvfs->z_teardown_lock, B_FALSE);
#endif
rw_init(&zfsvfs->z_teardown_inactive_lock, NULL, RW_DEFAULT, NULL);
rw_init(&zfsvfs->z_fuid_lock, NULL, RW_DEFAULT, NULL);
for (int i = 0; i != ZFS_OBJ_MTX_SZ; i++)
mutex_init(&zfsvfs->z_hold_mtx[i], NULL, MUTEX_DEFAULT, NULL);
error = zfsvfs_init(zfsvfs, os);
if (error != 0) {
dmu_objset_disown(os, zfsvfs);
*zfvp = NULL;
kmem_free(zfsvfs, sizeof (zfsvfs_t));
return (error);
}
*zfvp = zfsvfs;
return (0);
}
static int
zfsvfs_setup(zfsvfs_t *zfsvfs, boolean_t mounting)
{
int error;
error = zfs_register_callbacks(zfsvfs->z_vfs);
if (error)
return (error);
zfsvfs->z_log = zil_open(zfsvfs->z_os, zfs_get_data);
/*
* If we are not mounting (ie: online recv), then we don't
* have to worry about replaying the log as we blocked all
* operations out since we closed the ZIL.
*/
if (mounting) {
boolean_t readonly;
/*
* During replay we remove the read only flag to
* allow replays to succeed.
*/
readonly = zfsvfs->z_vfs->vfs_flag & VFS_RDONLY;
if (readonly != 0)
zfsvfs->z_vfs->vfs_flag &= ~VFS_RDONLY;
else
zfs_unlinked_drain(zfsvfs);
/*
* Parse and replay the intent log.
*
* Because of ziltest, this must be done after
* zfs_unlinked_drain(). (Further note: ziltest
* doesn't use readonly mounts, where
* zfs_unlinked_drain() isn't called.) This is because
* ziltest causes spa_sync() to think it's committed,
* but actually it is not, so the intent log contains
* many txg's worth of changes.
*
* In particular, if object N is in the unlinked set in
* the last txg to actually sync, then it could be
* actually freed in a later txg and then reallocated
* in a yet later txg. This would write a "create
* object N" record to the intent log. Normally, this
* would be fine because the spa_sync() would have
* written out the fact that object N is free, before
* we could write the "create object N" intent log
* record.
*
* But when we are in ziltest mode, we advance the "open
* txg" without actually spa_sync()-ing the changes to
* disk. So we would see that object N is still
* allocated and in the unlinked set, and there is an
* intent log record saying to allocate it.
*/
if (spa_writeable(dmu_objset_spa(zfsvfs->z_os))) {
if (zil_replay_disable) {
zil_destroy(zfsvfs->z_log, B_FALSE);
} else {
zfsvfs->z_replay = B_TRUE;
zil_replay(zfsvfs->z_os, zfsvfs,
zfs_replay_vector);
zfsvfs->z_replay = B_FALSE;
}
}
zfsvfs->z_vfs->vfs_flag |= readonly; /* restore readonly bit */
}
/*
* Set the objset user_ptr to track its zfsvfs.
*/
mutex_enter(&zfsvfs->z_os->os_user_ptr_lock);
dmu_objset_set_user(zfsvfs->z_os, zfsvfs);
mutex_exit(&zfsvfs->z_os->os_user_ptr_lock);
return (0);
}
extern krwlock_t zfsvfs_lock; /* in zfs_znode.c */
void
zfsvfs_free(zfsvfs_t *zfsvfs)
{
int i;
/*
* This is a barrier to prevent the filesystem from going away in
* zfs_znode_move() until we can safely ensure that the filesystem is
* not unmounted. We consider the filesystem valid before the barrier
* and invalid after the barrier.
*/
rw_enter(&zfsvfs_lock, RW_READER);
rw_exit(&zfsvfs_lock);
zfs_fuid_destroy(zfsvfs);
mutex_destroy(&zfsvfs->z_znodes_lock);
mutex_destroy(&zfsvfs->z_lock);
list_destroy(&zfsvfs->z_all_znodes);
rrm_destroy(&zfsvfs->z_teardown_lock);
rw_destroy(&zfsvfs->z_teardown_inactive_lock);
rw_destroy(&zfsvfs->z_fuid_lock);
for (i = 0; i != ZFS_OBJ_MTX_SZ; i++)
mutex_destroy(&zfsvfs->z_hold_mtx[i]);
kmem_free(zfsvfs, sizeof (zfsvfs_t));
}
static void
zfs_set_fuid_feature(zfsvfs_t *zfsvfs)
{
zfsvfs->z_use_fuids = USE_FUIDS(zfsvfs->z_version, zfsvfs->z_os);
if (zfsvfs->z_vfs) {
if (zfsvfs->z_use_fuids) {
vfs_set_feature(zfsvfs->z_vfs, VFSFT_XVATTR);
vfs_set_feature(zfsvfs->z_vfs, VFSFT_SYSATTR_VIEWS);
vfs_set_feature(zfsvfs->z_vfs, VFSFT_ACEMASKONACCESS);
vfs_set_feature(zfsvfs->z_vfs, VFSFT_ACLONCREATE);
vfs_set_feature(zfsvfs->z_vfs, VFSFT_ACCESS_FILTER);
vfs_set_feature(zfsvfs->z_vfs, VFSFT_REPARSE);
} else {
vfs_clear_feature(zfsvfs->z_vfs, VFSFT_XVATTR);
vfs_clear_feature(zfsvfs->z_vfs, VFSFT_SYSATTR_VIEWS);
vfs_clear_feature(zfsvfs->z_vfs, VFSFT_ACEMASKONACCESS);
vfs_clear_feature(zfsvfs->z_vfs, VFSFT_ACLONCREATE);
vfs_clear_feature(zfsvfs->z_vfs, VFSFT_ACCESS_FILTER);
vfs_clear_feature(zfsvfs->z_vfs, VFSFT_REPARSE);
}
}
zfsvfs->z_use_sa = USE_SA(zfsvfs->z_version, zfsvfs->z_os);
}
#ifdef __NetBSD__
int
#else
static int
#endif
zfs_domount(vfs_t *vfsp, char *osname)
{
uint64_t recordsize, fsid_guid;
int error = 0;
zfsvfs_t *zfsvfs;
vnode_t *vp;
ASSERT(vfsp);
ASSERT(osname);
error = zfsvfs_create(osname, &zfsvfs);
if (error)
return (error);
zfsvfs->z_vfs = vfsp;
#ifdef illumos
/* Initialize the generic filesystem structure. */
vfsp->vfs_bcount = 0;
vfsp->vfs_data = NULL;
if (zfs_create_unique_device(&mount_dev) == -1) {
error = SET_ERROR(ENODEV);
goto out;
}
ASSERT(vfs_devismounted(mount_dev) == 0);
#endif
if (error = dsl_prop_get_integer(osname, "recordsize", &recordsize,
NULL))
goto out;
zfsvfs->z_vfs->vfs_bsize = SPA_MINBLOCKSIZE;
zfsvfs->z_vfs->mnt_stat.f_iosize = recordsize;
vfsp->vfs_data = zfsvfs;
#ifdef __FreeBSD_kernel__
vfsp->mnt_flag |= MNT_LOCAL;
vfsp->mnt_kern_flag |= MNTK_LOOKUP_SHARED;
vfsp->mnt_kern_flag |= MNTK_SHARED_WRITES;
vfsp->mnt_kern_flag |= MNTK_EXTENDED_SHARED;
vfsp->mnt_kern_flag |= MNTK_NO_IOPF; /* vn_io_fault can be used */
#endif
#ifdef __NetBSD__
vfsp->mnt_flag |= MNT_LOCAL;
vfsp->mnt_iflag |= IMNT_MPSAFE | IMNT_NCLOOKUP;
#endif
/*
* The fsid is 64 bits, composed of an 8-bit fs type, which
* separates our fsid from any other filesystem types, and a
* 56-bit objset unique ID. The objset unique ID is unique to
* all objsets open on this system, provided by unique_create().
* The 8-bit fs type must be put in the low bits of fsid[1]
* because that's where other Solaris filesystems put it.
*/
fsid_guid = dmu_objset_fsid_guid(zfsvfs->z_os);
ASSERT((fsid_guid & ~((1ULL<<56)-1)) == 0);
#ifdef __FreeBSD_kernel__
vfsp->vfs_fsid.val[0] = fsid_guid;
vfsp->vfs_fsid.val[1] = ((fsid_guid>>32) << 8) |
vfsp->mnt_vfc->vfc_typenum & 0xFF;
#endif
#ifdef __NetBSD__
vfsp->mnt_stat.f_fsidx.__fsid_val[0] = fsid_guid;
vfsp->mnt_stat.f_fsidx.__fsid_val[1] = ((fsid_guid>>32) << 8) |
makefstype(vfsp->mnt_op->vfs_name) & 0xFF;
vfsp->mnt_stat.f_fsid = fsid_guid;
#endif
/*
* Set features for file system.
*/
zfs_set_fuid_feature(zfsvfs);
if (zfsvfs->z_case == ZFS_CASE_INSENSITIVE) {
vfs_set_feature(vfsp, VFSFT_DIRENTFLAGS);
vfs_set_feature(vfsp, VFSFT_CASEINSENSITIVE);
vfs_set_feature(vfsp, VFSFT_NOCASESENSITIVE);
} else if (zfsvfs->z_case == ZFS_CASE_MIXED) {
vfs_set_feature(vfsp, VFSFT_DIRENTFLAGS);
vfs_set_feature(vfsp, VFSFT_CASEINSENSITIVE);
}
vfs_set_feature(vfsp, VFSFT_ZEROCOPY_SUPPORTED);
if (dmu_objset_is_snapshot(zfsvfs->z_os)) {
uint64_t pval;
atime_changed_cb(zfsvfs, B_FALSE);
readonly_changed_cb(zfsvfs, B_TRUE);
if (error = dsl_prop_get_integer(osname, "xattr", &pval, NULL))
goto out;
xattr_changed_cb(zfsvfs, pval);
zfsvfs->z_issnap = B_TRUE;
zfsvfs->z_os->os_sync = ZFS_SYNC_DISABLED;
mutex_enter(&zfsvfs->z_os->os_user_ptr_lock);
dmu_objset_set_user(zfsvfs->z_os, zfsvfs);
mutex_exit(&zfsvfs->z_os->os_user_ptr_lock);
} else {
error = zfsvfs_setup(zfsvfs, B_TRUE);
}
#ifdef __FreeBSD_kernel__
vfs_mountedfrom(vfsp, osname);
#endif
#ifdef __NetBSD__
set_statvfs_info("on-name", UIO_SYSSPACE, osname, UIO_SYSSPACE, "zfs", vfsp, curlwp);
#endif
if (!zfsvfs->z_issnap)
zfsctl_create(zfsvfs);
out:
if (error) {
dmu_objset_disown(zfsvfs->z_os, zfsvfs);
zfsvfs_free(zfsvfs);
} else {
atomic_inc_32(&zfs_active_fs_count);
}
return (error);
}
void
zfs_unregister_callbacks(zfsvfs_t *zfsvfs)
{
objset_t *os = zfsvfs->z_os;
if (!dmu_objset_is_snapshot(os))
dsl_prop_unregister_all(dmu_objset_ds(os), zfsvfs);
}
#ifdef SECLABEL
/*
* Convert a decimal digit string to a uint64_t integer.
*/
static int
str_to_uint64(char *str, uint64_t *objnum)
{
uint64_t num = 0;
while (*str) {
if (*str < '0' || *str > '9')
return (SET_ERROR(EINVAL));
num = num*10 + *str++ - '0';
}
*objnum = num;
return (0);
}
/*
* The boot path passed from the boot loader is in the form of
* "rootpool-name/root-filesystem-object-number'. Convert this
* string to a dataset name: "rootpool-name/root-filesystem-name".
*/
static int
zfs_parse_bootfs(char *bpath, char *outpath)
{
char *slashp;
uint64_t objnum;
int error;
if (*bpath == 0 || *bpath == '/')
return (SET_ERROR(EINVAL));
(void) strcpy(outpath, bpath);
slashp = strchr(bpath, '/');
/* if no '/', just return the pool name */
if (slashp == NULL) {
return (0);
}
/* if not a number, just return the root dataset name */
if (str_to_uint64(slashp+1, &objnum)) {
return (0);
}
*slashp = '\0';
error = dsl_dsobj_to_dsname(bpath, objnum, outpath);
*slashp = '/';
return (error);
}
/*
* Check that the hex label string is appropriate for the dataset being
* mounted into the global_zone proper.
*
* Return an error if the hex label string is not default or
* admin_low/admin_high. For admin_low labels, the corresponding
* dataset must be readonly.
*/
int
zfs_check_global_label(const char *dsname, const char *hexsl)
{
if (strcasecmp(hexsl, ZFS_MLSLABEL_DEFAULT) == 0)
return (0);
if (strcasecmp(hexsl, ADMIN_HIGH) == 0)
return (0);
if (strcasecmp(hexsl, ADMIN_LOW) == 0) {
/* must be readonly */
uint64_t rdonly;
if (dsl_prop_get_integer(dsname,
zfs_prop_to_name(ZFS_PROP_READONLY), &rdonly, NULL))
return (SET_ERROR(EACCES));
return (rdonly ? 0 : EACCES);
}
return (SET_ERROR(EACCES));
}
/*
* Determine whether the mount is allowed according to MAC check.
* by comparing (where appropriate) label of the dataset against
* the label of the zone being mounted into. If the dataset has
* no label, create one.
*
* Returns 0 if access allowed, error otherwise (e.g. EACCES)
*/
static int
zfs_mount_label_policy(vfs_t *vfsp, char *osname)
{
int error, retv;
zone_t *mntzone = NULL;
ts_label_t *mnt_tsl;
bslabel_t *mnt_sl;
bslabel_t ds_sl;
char ds_hexsl[MAXNAMELEN];
retv = EACCES; /* assume the worst */
/*
* Start by getting the dataset label if it exists.
*/
error = dsl_prop_get(osname, zfs_prop_to_name(ZFS_PROP_MLSLABEL),
1, sizeof (ds_hexsl), &ds_hexsl, NULL);
if (error)
return (SET_ERROR(EACCES));
/*
* If labeling is NOT enabled, then disallow the mount of datasets
* which have a non-default label already. No other label checks
* are needed.
*/
if (!is_system_labeled()) {
if (strcasecmp(ds_hexsl, ZFS_MLSLABEL_DEFAULT) == 0)
return (0);
return (SET_ERROR(EACCES));
}
/*
* Get the label of the mountpoint. If mounting into the global
* zone (i.e. mountpoint is not within an active zone and the
* zoned property is off), the label must be default or
* admin_low/admin_high only; no other checks are needed.
*/
mntzone = zone_find_by_any_path(refstr_value(vfsp->vfs_mntpt), B_FALSE);
if (mntzone->zone_id == GLOBAL_ZONEID) {
uint64_t zoned;
zone_rele(mntzone);
if (dsl_prop_get_integer(osname,
zfs_prop_to_name(ZFS_PROP_ZONED), &zoned, NULL))
return (SET_ERROR(EACCES));
if (!zoned)
return (zfs_check_global_label(osname, ds_hexsl));
else
/*
* This is the case of a zone dataset being mounted
* initially, before the zone has been fully created;
* allow this mount into global zone.
*/
return (0);
}
mnt_tsl = mntzone->zone_slabel;
ASSERT(mnt_tsl != NULL);
label_hold(mnt_tsl);
mnt_sl = label2bslabel(mnt_tsl);
if (strcasecmp(ds_hexsl, ZFS_MLSLABEL_DEFAULT) == 0) {
/*
* The dataset doesn't have a real label, so fabricate one.
*/
char *str = NULL;
if (l_to_str_internal(mnt_sl, &str) == 0 &&
dsl_prop_set_string(osname,
zfs_prop_to_name(ZFS_PROP_MLSLABEL),
ZPROP_SRC_LOCAL, str) == 0)
retv = 0;
if (str != NULL)
kmem_free(str, strlen(str) + 1);
} else if (hexstr_to_label(ds_hexsl, &ds_sl) == 0) {
/*
* Now compare labels to complete the MAC check. If the
* labels are equal then allow access. If the mountpoint
* label dominates the dataset label, allow readonly access.
* Otherwise, access is denied.
*/
if (blequal(mnt_sl, &ds_sl))
retv = 0;
else if (bldominates(mnt_sl, &ds_sl)) {
vfs_setmntopt(vfsp, MNTOPT_RO, NULL, 0);
retv = 0;
}
}
label_rele(mnt_tsl);
zone_rele(mntzone);
return (retv);
}
#endif /* SECLABEL */
#ifdef OPENSOLARIS_MOUNTROOT
static int
zfs_mountroot(vfs_t *vfsp, enum whymountroot why)
{
int error = 0;
static int zfsrootdone = 0;
zfsvfs_t *zfsvfs = NULL;
znode_t *zp = NULL;
vnode_t *vp = NULL;
char *zfs_bootfs;
char *zfs_devid;
ASSERT(vfsp);
/*
* The filesystem that we mount as root is defined in the
* boot property "zfs-bootfs" with a format of
* "poolname/root-dataset-objnum".
*/
if (why == ROOT_INIT) {
if (zfsrootdone++)
return (SET_ERROR(EBUSY));
/*
* the process of doing a spa_load will require the
* clock to be set before we could (for example) do
* something better by looking at the timestamp on
* an uberblock, so just set it to -1.
*/
clkset(-1);
if ((zfs_bootfs = spa_get_bootprop("zfs-bootfs")) == NULL) {
cmn_err(CE_NOTE, "spa_get_bootfs: can not get "
"bootfs name");
return (SET_ERROR(EINVAL));
}
zfs_devid = spa_get_bootprop("diskdevid");
error = spa_import_rootpool(rootfs.bo_name, zfs_devid);
if (zfs_devid)
spa_free_bootprop(zfs_devid);
if (error) {
spa_free_bootprop(zfs_bootfs);
cmn_err(CE_NOTE, "spa_import_rootpool: error %d",
error);
return (error);
}
if (error = zfs_parse_bootfs(zfs_bootfs, rootfs.bo_name)) {
spa_free_bootprop(zfs_bootfs);
cmn_err(CE_NOTE, "zfs_parse_bootfs: error %d",
error);
return (error);
}
spa_free_bootprop(zfs_bootfs);
if (error = vfs_lock(vfsp))
return (error);
if (error = zfs_domount(vfsp, rootfs.bo_name)) {
cmn_err(CE_NOTE, "zfs_domount: error %d", error);
goto out;
}
zfsvfs = (zfsvfs_t *)vfsp->vfs_data;
ASSERT(zfsvfs);
if (error = zfs_zget(zfsvfs, zfsvfs->z_root, &zp)) {
cmn_err(CE_NOTE, "zfs_zget: error %d", error);
goto out;
}
vp = ZTOV(zp);
mutex_enter(&vp->v_lock);
vp->v_flag |= VROOT;
mutex_exit(&vp->v_lock);
rootvp = vp;
/*
* Leave rootvp held. The root file system is never unmounted.
*/
vfs_add((struct vnode *)0, vfsp,
(vfsp->vfs_flag & VFS_RDONLY) ? MS_RDONLY : 0);
out:
vfs_unlock(vfsp);
return (error);
} else if (why == ROOT_REMOUNT) {
readonly_changed_cb(vfsp->vfs_data, B_FALSE);
vfsp->vfs_flag |= VFS_REMOUNT;
/* refresh mount options */
zfs_unregister_callbacks(vfsp->vfs_data);
return (zfs_register_callbacks(vfsp));
} else if (why == ROOT_UNMOUNT) {
zfs_unregister_callbacks((zfsvfs_t *)vfsp->vfs_data);
(void) zfs_sync(vfsp, 0, 0);
return (0);
}
/*
* if "why" is equal to anything else other than ROOT_INIT,
* ROOT_REMOUNT, or ROOT_UNMOUNT, we do not support it.
*/
return (SET_ERROR(ENOTSUP));
}
#endif /* OPENSOLARIS_MOUNTROOT */
static int
getpoolname(const char *osname, char *poolname)
{
char *p;
p = strchr(osname, '/');
if (p == NULL) {
if (strlen(osname) >= MAXNAMELEN)
return (ENAMETOOLONG);
(void) strcpy(poolname, osname);
} else {
if (p - osname >= MAXNAMELEN)
return (ENAMETOOLONG);
(void) strncpy(poolname, osname, p - osname);
poolname[p - osname] = '\0';
}
return (0);
}
/*ARGSUSED*/
#ifdef illumos
static int
zfs_mount(vfs_t *vfsp, vnode_t *mvp, struct mounta *uap, cred_t *cr)
#endif
#ifdef __FreeBSD_kernel__
static int
zfs_mount(vfs_t *vfsp)
#endif
#ifdef __NetBSD__
static int
zfs_mount(vfs_t *vfsp, const char *path, void *data, size_t *data_len)
#endif
{
vnode_t *mvp = vfsp->mnt_vnodecovered;
char *osname;
int error = 0;
int canwrite;
#ifdef illumos
if (mvp->v_type != VDIR)
return (SET_ERROR(ENOTDIR));
mutex_enter(&mvp->v_lock);
if ((uap->flags & MS_REMOUNT) == 0 &&
(uap->flags & MS_OVERLAY) == 0 &&
(mvp->v_count != 1 || (mvp->v_flag & VROOT))) {
mutex_exit(&mvp->v_lock);
return (SET_ERROR(EBUSY));
}
mutex_exit(&mvp->v_lock);
/*
* ZFS does not support passing unparsed data in via MS_DATA.
* Users should use the MS_OPTIONSTR interface; this means
* that all option parsing is already done and the options struct
* can be interrogated.
*/
if ((uap->flags & MS_DATA) && uap->datalen > 0)
return (SET_ERROR(EINVAL));
#endif /* illumos */
#ifdef __FreeBSD_kernel__
kthread_t *td = curthread;
cred_t *cr = td->td_ucred;
if (!prison_allow(td->td_ucred, PR_ALLOW_MOUNT_ZFS))
return (SET_ERROR(EPERM));
if (vfs_getopt(vfsp->mnt_optnew, "from", (void **)&osname, NULL))
return (SET_ERROR(EINVAL));
/*
* If full-owner-access is enabled and delegated administration is
* turned on, we must set nosuid.
*/
if (zfs_super_owner &&
dsl_deleg_access(osname, ZFS_DELEG_PERM_MOUNT, cr) != ECANCELED) {
secpolicy_fs_mount_clearopts(cr, vfsp);
}
#endif /* __FreeBSD_kernel__ */
#ifdef __NetBSD__
cred_t *cr = CRED();
struct mounta *uap = data;
if (uap == NULL)
return (SET_ERROR(EINVAL));
if (*data_len < sizeof *uap)
return (SET_ERROR(EINVAL));
if (mvp->v_type != VDIR)
return (SET_ERROR(ENOTDIR));
mutex_enter(mvp->v_interlock);
if ((uap->flags & MS_REMOUNT) == 0 &&
(uap->flags & MS_OVERLAY) == 0 &&
(vrefcnt(mvp) != 1 || (mvp->v_flag & VROOT))) {
mutex_exit(mvp->v_interlock);
return (SET_ERROR(EBUSY));
}
mutex_exit(mvp->v_interlock);
osname = PNBUF_GET();
strlcpy(osname, uap->fspec, strlen(uap->fspec) + 1);
#endif /* __NetBSD__ */
/*
* Check for mount privilege?
*
* If we don't have privilege then see if
* we have local permission to allow it
*/
error = secpolicy_fs_mount(cr, mvp, vfsp);
if (error) {
if (dsl_deleg_access(osname, ZFS_DELEG_PERM_MOUNT, cr) != 0)
goto out;
if (!(vfsp->vfs_flag & MS_REMOUNT)) {
vattr_t vattr;
/*
* Make sure user is the owner of the mount point
* or has sufficient privileges.
*/
vattr.va_mask = AT_UID;
#ifdef __FreeBSD_kernel__
vn_lock(mvp, LK_SHARED | LK_RETRY);
if (VOP_GETATTR(mvp, &vattr, cr)) {
VOP_UNLOCK(mvp, 0);
goto out;
}
if (secpolicy_vnode_owner(mvp, cr, vattr.va_uid) != 0 &&
VOP_ACCESS(mvp, VWRITE, cr, td) != 0) {
VOP_UNLOCK(mvp, 0);
goto out;
}
VOP_UNLOCK(mvp, 0);
#endif
#ifdef __NetBSD__
vn_lock(mvp, LK_SHARED | LK_RETRY);
if (VOP_GETATTR(mvp, &vattr, 0, cr, NULL)) {
VOP_UNLOCK(mvp, 0);
goto out;
}
if (secpolicy_vnode_owner(mvp, cr, vattr.va_uid) != 0 &&
VOP_ACCESS(mvp, VWRITE, cr) != 0) {
VOP_UNLOCK(mvp, 0);
goto out;
}
VOP_UNLOCK(mvp, 0);
#endif
}
secpolicy_fs_mount_clearopts(cr, vfsp);
}
/*
* Refuse to mount a filesystem if we are in a local zone and the
* dataset is not visible.
*/
if (!INGLOBALZONE(curthread) &&
(!zone_dataset_visible(osname, &canwrite) || !canwrite)) {
error = SET_ERROR(EPERM);
goto out;
}
#ifdef SECLABEL
error = zfs_mount_label_policy(vfsp, osname);
if (error)
goto out;
#endif
#ifdef __FreeBSD_kernel__
vfsp->vfs_flag |= MNT_NFS4ACLS;
#endif
#ifdef __NetBSD__
vfsp->mnt_iflag |= IMNT_MPSAFE | IMNT_NCLOOKUP;
#endif
/*
* When doing a remount, we simply refresh our temporary properties
* according to those options set in the current VFS options.
*/
if (vfsp->vfs_flag & MS_REMOUNT) {
zfsvfs_t *zfsvfs = vfsp->vfs_data;
/*
* Refresh mount options with z_teardown_lock blocking I/O while
* the filesystem is in an inconsistent state.
* The lock also serializes this code with filesystem
* manipulations between entry to zfs_suspend_fs() and return
* from zfs_resume_fs().
*/
rrm_enter(&zfsvfs->z_teardown_lock, RW_WRITER, FTAG);
zfs_unregister_callbacks(zfsvfs);
error = zfs_register_callbacks(vfsp);
rrm_exit(&zfsvfs->z_teardown_lock, FTAG);
goto out;
}
#ifdef __FreeBSD_kernel__
/* Initial root mount: try hard to import the requested root pool. */
if ((vfsp->vfs_flag & MNT_ROOTFS) != 0 &&
(vfsp->vfs_flag & MNT_UPDATE) == 0) {
char pname[MAXNAMELEN];
error = getpoolname(osname, pname);
if (error == 0)
error = spa_import_rootpool(pname);
if (error)
goto out;
}
#endif
DROP_GIANT();
error = zfs_domount(vfsp, osname);
PICKUP_GIANT();
#ifdef illumos
/*
* Add an extra VFS_HOLD on our parent vfs so that it can't
* disappear due to a forced unmount.
*/
if (error == 0 && ((zfsvfs_t *)vfsp->vfs_data)->z_issnap)
VFS_HOLD(mvp->v_vfsp);
#endif
#ifdef __NetBSD__
/* setup zfs mount info */
strlcpy(vfsp->mnt_stat.f_mntfromname, osname,
sizeof(vfsp->mnt_stat.f_mntfromname));
set_statvfs_info(path, UIO_USERSPACE, vfsp->mnt_stat.f_mntfromname,
UIO_SYSSPACE, vfsp->mnt_op->vfs_name, vfsp, curlwp);
#endif
out:
return (error);
}
#ifdef __FreeBSD_kernel__
static int
zfs_statfs(vfs_t *vfsp, struct statfs *statp)
#endif
#ifdef __NetBSD__
static int
zfs_statvfs(vfs_t *vfsp, struct statvfs *statp)
#endif
{
zfsvfs_t *zfsvfs = vfsp->vfs_data;
uint64_t refdbytes, availbytes, usedobjs, availobjs;
#ifdef __FreeBSD_kernel__
statp->f_version = STATFS_VERSION;
#endif
ZFS_ENTER(zfsvfs);
dmu_objset_space(zfsvfs->z_os,
&refdbytes, &availbytes, &usedobjs, &availobjs);
/*
* The underlying storage pool actually uses multiple block sizes.
* We report the fragsize as the smallest block size we support,
* and we report our blocksize as the filesystem's maximum blocksize.
*/
statp->f_bsize = SPA_MINBLOCKSIZE;
#ifdef __NetBSD__
statp->f_frsize = SPA_MINBLOCKSIZE;
#endif
statp->f_iosize = zfsvfs->z_vfs->mnt_stat.f_iosize;
/*
* The following report "total" blocks of various kinds in the
* file system, but reported in terms of f_frsize - the
* "fragment" size.
*/
statp->f_blocks = (refdbytes + availbytes) >> SPA_MINBLOCKSHIFT;
statp->f_bfree = availbytes / statp->f_bsize;
statp->f_bavail = statp->f_bfree; /* no root reservation */
statp->f_bresvd = 0;
/*
* statvfs() should really be called statufs(), because it assumes
* static metadata. ZFS doesn't preallocate files, so the best
* we can do is report the max that could possibly fit in f_files,
* and that minus the number actually used in f_ffree.
* For f_ffree, report the smaller of the number of object available
* and the number of blocks (each object will take at least a block).
*/
statp->f_ffree = MIN(availobjs, statp->f_bfree);
#ifndef __FreeBSD__
statp->f_favail = statp->f_ffree; /* no "root reservation" */
#endif
statp->f_files = statp->f_ffree + usedobjs;
statp->f_fresvd = 0;
#ifdef __FreeBSD__
(void) cmpldev(&d32, vfsp->vfs_dev);
statp->f_fsid = d32;
#endif
#ifdef __NetBSD__
statp->f_fsid = vfsp->mnt_stat.f_fsid;
statp->f_fsidx = vfsp->mnt_stat.f_fsidx;
#endif
/*
* We're a zfs filesystem.
*/
(void) strlcpy(statp->f_fstypename, "zfs", sizeof(statp->f_fstypename));
strlcpy(statp->f_mntfromname, vfsp->mnt_stat.f_mntfromname,
sizeof(statp->f_mntfromname));
strlcpy(statp->f_mntonname, vfsp->mnt_stat.f_mntonname,
sizeof(statp->f_mntonname));
#ifdef __FreeBSD_kernel__
statp->f_namemax = MAXNAMELEN - 1;
#endif
#ifdef __NetBSD__
statp->f_namemax = ZFS_MAXNAMELEN;
#endif
ZFS_EXIT(zfsvfs);
return (0);
}
static int
zfs_root(vfs_t *vfsp, int flags, vnode_t **vpp)
{
zfsvfs_t *zfsvfs = vfsp->vfs_data;
znode_t *rootzp;
int error;
ZFS_ENTER(zfsvfs);
error = zfs_zget(zfsvfs, zfsvfs->z_root, &rootzp);
if (error == 0)
*vpp = ZTOV(rootzp);
ZFS_EXIT(zfsvfs);
if (error == 0) {
error = vn_lock(*vpp, flags);
if (error != 0) {
VN_RELE(*vpp);
*vpp = NULL;
}
}
return (error);
}
/*
* Teardown the zfsvfs::z_os.
*
* Note, if 'unmounting' if FALSE, we return with the 'z_teardown_lock'
* and 'z_teardown_inactive_lock' held.
*/
static int
zfsvfs_teardown(zfsvfs_t *zfsvfs, boolean_t unmounting)
{
znode_t *zp;
rrm_enter(&zfsvfs->z_teardown_lock, RW_WRITER, FTAG);
if (!unmounting) {
/*
* We purge the parent filesystem's vfsp as the parent
* filesystem and all of its snapshots have their vnode's
* v_vfsp set to the parent's filesystem's vfsp. Note,
* 'z_parent' is self referential for non-snapshots.
*/
(void) dnlc_purge_vfsp(zfsvfs->z_parent->z_vfs, 0);
#ifdef FREEBSD_NAMECACHE
cache_purgevfs(zfsvfs->z_parent->z_vfs, true);
#endif
}
/*
* Close the zil. NB: Can't close the zil while zfs_inactive
* threads are blocked as zil_close can call zfs_inactive.
*/
if (zfsvfs->z_log) {
zil_close(zfsvfs->z_log);
zfsvfs->z_log = NULL;
}
rw_enter(&zfsvfs->z_teardown_inactive_lock, RW_WRITER);
/*
* If we are not unmounting (ie: online recv) and someone already
* unmounted this file system while we were doing the switcheroo,
* or a reopen of z_os failed then just bail out now.
*/
if (!unmounting && (zfsvfs->z_unmounted || zfsvfs->z_os == NULL)) {
rw_exit(&zfsvfs->z_teardown_inactive_lock);
rrm_exit(&zfsvfs->z_teardown_lock, FTAG);
return (SET_ERROR(EIO));
}
/*
* At this point there are no vops active, and any new vops will
* fail with EIO since we have z_teardown_lock for writer (only
* relavent for forced unmount).
*
* Release all holds on dbufs.
*/
mutex_enter(&zfsvfs->z_znodes_lock);
for (zp = list_head(&zfsvfs->z_all_znodes); zp != NULL;
zp = list_next(&zfsvfs->z_all_znodes, zp))
if (zp->z_sa_hdl) {
#ifdef __NetBSD__
ASSERT(vrefcnt(ZTOV(zp)) >= 0);
#else
ASSERT(ZTOV(zp)->v_count >= 0);
#endif
zfs_znode_dmu_fini(zp);
}
mutex_exit(&zfsvfs->z_znodes_lock);
/*
* If we are unmounting, set the unmounted flag and let new vops
* unblock. zfs_inactive will have the unmounted behavior, and all
* other vops will fail with EIO.
*/
if (unmounting) {
zfsvfs->z_unmounted = B_TRUE;
rrm_exit(&zfsvfs->z_teardown_lock, FTAG);
rw_exit(&zfsvfs->z_teardown_inactive_lock);
}
/*
* z_os will be NULL if there was an error in attempting to reopen
* zfsvfs, so just return as the properties had already been
* unregistered and cached data had been evicted before.
*/
if (zfsvfs->z_os == NULL)
return (0);
/*
* Unregister properties.
*/
zfs_unregister_callbacks(zfsvfs);
/*
* Evict cached data
*/
if (dsl_dataset_is_dirty(dmu_objset_ds(zfsvfs->z_os)) &&
!(zfsvfs->z_vfs->vfs_flag & VFS_RDONLY))
txg_wait_synced(dmu_objset_pool(zfsvfs->z_os), 0);
dmu_objset_evict_dbufs(zfsvfs->z_os);
return (0);
}
/*ARGSUSED*/
static int
zfs_umount(vfs_t *vfsp, int fflag)
{
zfsvfs_t *zfsvfs = vfsp->vfs_data;
objset_t *os;
int ret;
#ifdef __FreeBSD_kernel__
kthread_t *td = curthread;
cred_t *cr = td->td_ucred;
#endif
#ifdef __NetBSD__
cred_t *cr = CRED();
#endif
ret = secpolicy_fs_unmount(cr, vfsp);
if (ret) {
if (dsl_deleg_access((char *)refstr_value(vfsp->vfs_resource),
ZFS_DELEG_PERM_MOUNT, cr))
return (ret);
}
/*
* We purge the parent filesystem's vfsp as the parent filesystem
* and all of its snapshots have their vnode's v_vfsp set to the
* parent's filesystem's vfsp. Note, 'z_parent' is self
* referential for non-snapshots.
*/
(void) dnlc_purge_vfsp(zfsvfs->z_parent->z_vfs, 0);
/*
* Unmount any snapshots mounted under .zfs before unmounting the
* dataset itself.
*/
if (zfsvfs->z_ctldir != NULL) {
if ((ret = zfsctl_umount_snapshots(vfsp, fflag, cr)) != 0)
return (ret);
}
if (fflag & MS_FORCE) {
/*
* Mark file system as unmounted before calling
* vflush(FORCECLOSE). This way we ensure no future vnops
* will be called and risk operating on DOOMED vnodes.
*/
rrm_enter(&zfsvfs->z_teardown_lock, RW_WRITER, FTAG);
zfsvfs->z_unmounted = B_TRUE;
rrm_exit(&zfsvfs->z_teardown_lock, FTAG);
}
/*
* Flush all the files.
*/
#ifdef __FreeBSD_kernel__
ret = vflush(vfsp, 0, (fflag & MS_FORCE) ? FORCECLOSE : 0, td);
#endif
#ifdef __NetBSD__
ret = vflush(vfsp, NULL, (fflag & MS_FORCE) ? FORCECLOSE : 0);
#endif
if (ret != 0)
return (ret);
#ifdef illumos
if (!(fflag & MS_FORCE)) {
/*
* Check the number of active vnodes in the file system.
* Our count is maintained in the vfs structure, but the
* number is off by 1 to indicate a hold on the vfs
* structure itself.
*
* The '.zfs' directory maintains a reference of its
* own, and any active references underneath are
* reflected in the vnode count.
*/
if (zfsvfs->z_ctldir == NULL) {
if (vfsp->vfs_count > 1)
return (SET_ERROR(EBUSY));
} else {
if (vfsp->vfs_count > 2 ||
zfsvfs->z_ctldir->v_count > 1)
return (SET_ERROR(EBUSY));
}
}
#endif
VERIFY(zfsvfs_teardown(zfsvfs, B_TRUE) == 0);
os = zfsvfs->z_os;
/*
* z_os will be NULL if there was an error in
* attempting to reopen zfsvfs.
*/
if (os != NULL) {
/*
* Unset the objset user_ptr.
*/
mutex_enter(&os->os_user_ptr_lock);
dmu_objset_set_user(os, NULL);
mutex_exit(&os->os_user_ptr_lock);
/*
* Finally release the objset
*/
dmu_objset_disown(os, zfsvfs);
}
/*
* We can now safely destroy the '.zfs' directory node.
*/
if (zfsvfs->z_ctldir != NULL)
zfsctl_destroy(zfsvfs);
zfs_freevfs(vfsp);
return (0);
}
static int
zfs_vget(vfs_t *vfsp, ino_t ino, int flags, vnode_t **vpp)
{
zfsvfs_t *zfsvfs = vfsp->vfs_data;
znode_t *zp;
int err;
/*
* zfs_zget() can't operate on virtual entries like .zfs/ or
* .zfs/snapshot/ directories, that's why we return EOPNOTSUPP.
* This will make NFS to switch to LOOKUP instead of using VGET.
*/
if (ino == ZFSCTL_INO_ROOT || ino == ZFSCTL_INO_SNAPDIR ||
(zfsvfs->z_shares_dir != 0 && ino == zfsvfs->z_shares_dir))
return (EOPNOTSUPP);
ZFS_ENTER(zfsvfs);
err = zfs_zget(zfsvfs, ino, &zp);
if (err == 0 && zp->z_unlinked) {
VN_RELE(ZTOV(zp));
err = EINVAL;
}
if (err == 0)
*vpp = ZTOV(zp);
ZFS_EXIT(zfsvfs);
if (err == 0)
err = vn_lock(*vpp, flags);
if (err != 0)
*vpp = NULL;
return (err);
}
#ifdef __FreeBSD_kernel__
static int
zfs_checkexp(vfs_t *vfsp, struct sockaddr *nam, int *extflagsp,
struct ucred **credanonp, int *numsecflavors, int **secflavors)
{
zfsvfs_t *zfsvfs = vfsp->vfs_data;
/*
* If this is regular file system vfsp is the same as
* zfsvfs->z_parent->z_vfs, but if it is snapshot,
* zfsvfs->z_parent->z_vfs represents parent file system
* which we have to use here, because only this file system
* has mnt_export configured.
*/
return (vfs_stdcheckexp(zfsvfs->z_parent->z_vfs, nam, extflagsp,
credanonp, numsecflavors, secflavors));
}
CTASSERT(SHORT_FID_LEN <= sizeof(struct fid));
CTASSERT(LONG_FID_LEN <= sizeof(struct fid));
#endif
#ifdef __FreeBSD_kernel__
static int
zfs_fhtovp(vfs_t *vfsp, fid_t *fidp, int flags, vnode_t **vpp)
{
struct componentname cn;
zfsvfs_t *zfsvfs = vfsp->vfs_data;
znode_t *zp;
vnode_t *dvp;
uint64_t object = 0;
uint64_t fid_gen = 0;
uint64_t gen_mask;
uint64_t zp_gen;
int i, err;
*vpp = NULL;
ZFS_ENTER(zfsvfs);
/*
* On FreeBSD we can get snapshot's mount point or its parent file
* system mount point depending if snapshot is already mounted or not.
*/
if (zfsvfs->z_parent == zfsvfs && fidp->fid_len == LONG_FID_LEN) {
zfid_long_t *zlfid = (zfid_long_t *)fidp;
uint64_t objsetid = 0;
uint64_t setgen = 0;
for (i = 0; i < sizeof (zlfid->zf_setid); i++)
objsetid |= ((uint64_t)zlfid->zf_setid[i]) << (8 * i);
for (i = 0; i < sizeof (zlfid->zf_setgen); i++)
setgen |= ((uint64_t)zlfid->zf_setgen[i]) << (8 * i);
ZFS_EXIT(zfsvfs);
err = zfsctl_lookup_objset(vfsp, objsetid, &zfsvfs);
if (err)
return (SET_ERROR(EINVAL));
ZFS_ENTER(zfsvfs);
}
if (fidp->fid_len == SHORT_FID_LEN || fidp->fid_len == LONG_FID_LEN) {
zfid_short_t *zfid = (zfid_short_t *)fidp;
for (i = 0; i < sizeof (zfid->zf_object); i++)
object |= ((uint64_t)zfid->zf_object[i]) << (8 * i);
for (i = 0; i < sizeof (zfid->zf_gen); i++)
fid_gen |= ((uint64_t)zfid->zf_gen[i]) << (8 * i);
} else {
ZFS_EXIT(zfsvfs);
return (SET_ERROR(EINVAL));
}
/*
* A zero fid_gen means we are in .zfs or the .zfs/snapshot
* directory tree. If the object == zfsvfs->z_shares_dir, then
* we are in the .zfs/shares directory tree.
*/
if ((fid_gen == 0 &&
(object == ZFSCTL_INO_ROOT || object == ZFSCTL_INO_SNAPDIR)) ||
(zfsvfs->z_shares_dir != 0 && object == zfsvfs->z_shares_dir)) {
ZFS_EXIT(zfsvfs);
VERIFY0(zfsctl_root(zfsvfs, LK_SHARED, &dvp));
if (object == ZFSCTL_INO_SNAPDIR) {
cn.cn_nameptr = "snapshot";
cn.cn_namelen = strlen(cn.cn_nameptr);
cn.cn_nameiop = LOOKUP;
cn.cn_flags = ISLASTCN | LOCKLEAF;
cn.cn_lkflags = flags;
VERIFY0(VOP_LOOKUP(dvp, vpp, &cn));
vput(dvp);
} else if (object == zfsvfs->z_shares_dir) {
/*
* XXX This branch must not be taken,
* if it is, then the lookup below will
* explode.
*/
cn.cn_nameptr = "shares";
cn.cn_namelen = strlen(cn.cn_nameptr);
cn.cn_nameiop = LOOKUP;
cn.cn_flags = ISLASTCN;
cn.cn_lkflags = flags;
VERIFY0(VOP_LOOKUP(dvp, vpp, &cn));
vput(dvp);
} else {
*vpp = dvp;
}
return (err);
}
gen_mask = -1ULL >> (64 - 8 * i);
dprintf("getting %llu [%u mask %llx]\n", object, fid_gen, gen_mask);
if (err = zfs_zget(zfsvfs, object, &zp)) {
ZFS_EXIT(zfsvfs);
return (err);
}
(void) sa_lookup(zp->z_sa_hdl, SA_ZPL_GEN(zfsvfs), &zp_gen,
sizeof (uint64_t));
zp_gen = zp_gen & gen_mask;
if (zp_gen == 0)
zp_gen = 1;
if (zp->z_unlinked || zp_gen != fid_gen) {
dprintf("znode gen (%u) != fid gen (%u)\n", zp_gen, fid_gen);
VN_RELE(ZTOV(zp));
ZFS_EXIT(zfsvfs);
return (SET_ERROR(EINVAL));
}
*vpp = ZTOV(zp);
ZFS_EXIT(zfsvfs);
err = vn_lock(*vpp, flags);
if (err == 0)
vnode_create_vobject(*vpp, zp->z_size, curthread);
else
*vpp = NULL;
return (err);
}
#endif /* __FreeBSD_kernel__ */
/*
* Block out VOPs and close zfsvfs_t::z_os
*
* Note, if successful, then we return with the 'z_teardown_lock' and
* 'z_teardown_inactive_lock' write held. We leave ownership of the underlying
* dataset and objset intact so that they can be atomically handed off during
* a subsequent rollback or recv operation and the resume thereafter.
*/
int
zfs_suspend_fs(zfsvfs_t *zfsvfs)
{
int error;
#ifdef __NetBSD__
if ((error = vfs_suspend(zfsvfs->z_vfs, 0)) != 0)
return error;
if ((error = zfsvfs_teardown(zfsvfs, B_FALSE)) != 0) {
vfs_resume(zfsvfs->z_vfs);
return (error);
}
#else
if ((error = zfsvfs_teardown(zfsvfs, B_FALSE)) != 0)
return (error);
#endif
return (0);
}
/*
* Rebuild SA and release VOPs. Note that ownership of the underlying dataset
* is an invariant across any of the operations that can be performed while the
* filesystem was suspended. Whether it succeeded or failed, the preconditions
* are the same: the relevant objset and associated dataset are owned by
* zfsvfs, held, and long held on entry.
*/
#ifdef __NetBSD__
static bool
zfs_resume_selector(void *cl, struct vnode *vp)
{
if (zfsctl_is_node(vp))
return false;
return (VTOZ(vp)->z_sa_hdl == NULL);
}
#endif
int
zfs_resume_fs(zfsvfs_t *zfsvfs, dsl_dataset_t *ds)
{
int err;
znode_t *zp;
ASSERT(RRM_WRITE_HELD(&zfsvfs->z_teardown_lock));
ASSERT(RW_WRITE_HELD(&zfsvfs->z_teardown_inactive_lock));
/*
* We already own this, so just update the objset_t, as the one we
* had before may have been evicted.
*/
objset_t *os;
VERIFY3P(ds->ds_owner, ==, zfsvfs);
VERIFY(dsl_dataset_long_held(ds));
VERIFY0(dmu_objset_from_ds(ds, &os));
err = zfsvfs_init(zfsvfs, os);
if (err != 0)
goto bail;
VERIFY(zfsvfs_setup(zfsvfs, B_FALSE) == 0);
zfs_set_fuid_feature(zfsvfs);
/*
* Attempt to re-establish all the active znodes with
* their dbufs. If a zfs_rezget() fails, then we'll let
* any potential callers discover that via ZFS_ENTER_VERIFY_VP
* when they try to use their znode.
*/
mutex_enter(&zfsvfs->z_znodes_lock);
for (zp = list_head(&zfsvfs->z_all_znodes); zp;
zp = list_next(&zfsvfs->z_all_znodes, zp)) {
(void) zfs_rezget(zp);
}
mutex_exit(&zfsvfs->z_znodes_lock);
bail:
/* release the VOPs */
rw_exit(&zfsvfs->z_teardown_inactive_lock);
rrm_exit(&zfsvfs->z_teardown_lock, FTAG);
#ifdef __NetBSD__
struct vnode_iterator *marker;
vnode_t *vp;
vfs_vnode_iterator_init(zfsvfs->z_vfs, &marker);
while ((vp = vfs_vnode_iterator_next(marker,
zfs_resume_selector, NULL))) {
vgone(vp);
}
vfs_vnode_iterator_destroy(marker);
vfs_resume(zfsvfs->z_vfs);
#endif
if (err) {
/*
* Since we couldn't setup the sa framework, try to force
* unmount this file system.
*/
if (vn_vfswlock(zfsvfs->z_vfs->vfs_vnodecovered) == 0) {
vfs_ref(zfsvfs->z_vfs);
(void) dounmount(zfsvfs->z_vfs, MS_FORCE, curthread);
}
}
return (err);
}
static void
zfs_freevfs(vfs_t *vfsp)
{
zfsvfs_t *zfsvfs = vfsp->vfs_data;
#ifdef illumos
/*
* If this is a snapshot, we have an extra VFS_HOLD on our parent
* from zfs_mount(). Release it here. If we came through
* zfs_mountroot() instead, we didn't grab an extra hold, so
* skip the VFS_RELE for rootvfs.
*/
if (zfsvfs->z_issnap && (vfsp != rootvfs))
VFS_RELE(zfsvfs->z_parent->z_vfs);
#endif
zfsvfs_free(zfsvfs);
atomic_dec_32(&zfs_active_fs_count);
}
#ifdef __FreeBSD_kernel__
#ifdef __i386__
static int desiredvnodes_backup;
#endif
static void
zfs_vnodes_adjust(void)
{
#ifdef __i386__
int newdesiredvnodes;
desiredvnodes_backup = desiredvnodes;
/*
* We calculate newdesiredvnodes the same way it is done in
* vntblinit(). If it is equal to desiredvnodes, it means that
* it wasn't tuned by the administrator and we can tune it down.
*/
newdesiredvnodes = min(maxproc + vm_cnt.v_page_count / 4, 2 *
vm_kmem_size / (5 * (sizeof(struct vm_object) +
sizeof(struct vnode))));
if (newdesiredvnodes == desiredvnodes)
desiredvnodes = (3 * newdesiredvnodes) / 4;
#endif
}
static void
zfs_vnodes_adjust_back(void)
{
#ifdef __i386__
desiredvnodes = desiredvnodes_backup;
#endif
}
#endif /* __FreeBSD_kernel__ */
#ifdef __NetBSD__
static void
zfs_vnodes_adjust(void)
{
}
static void
zfs_vnodes_adjust_back(void)
{
}
#endif
void
zfs_init(void)
{
printf("ZFS filesystem version: " ZPL_VERSION_STRING "\n");
/*
* Initialize .zfs directory structures
*/
zfsctl_init();
/*
* Initialize znode cache, vnode ops, etc...
*/
zfs_znode_init();
/*
* Reduce number of vnodes. Originally number of vnodes is calculated
* with UFS inode in mind. We reduce it here, because it's too big for
* ZFS/i386.
*/
zfs_vnodes_adjust();
dmu_objset_register_type(DMU_OST_ZFS, zfs_space_delta_cb);
}
void
zfs_fini(void)
{
zfsctl_fini();
zfs_znode_fini();
zfs_vnodes_adjust_back();
}
int
zfs_busy(void)
{
return (zfs_active_fs_count != 0);
}
int
zfs_set_version(zfsvfs_t *zfsvfs, uint64_t newvers)
{
int error;
objset_t *os = zfsvfs->z_os;
dmu_tx_t *tx;
if (newvers < ZPL_VERSION_INITIAL || newvers > ZPL_VERSION)
return (SET_ERROR(EINVAL));
if (newvers < zfsvfs->z_version)
return (SET_ERROR(EINVAL));
if (zfs_spa_version_map(newvers) >
spa_version(dmu_objset_spa(zfsvfs->z_os)))
return (SET_ERROR(ENOTSUP));
tx = dmu_tx_create(os);
dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, B_FALSE, ZPL_VERSION_STR);
if (newvers >= ZPL_VERSION_SA && !zfsvfs->z_use_sa) {
dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, B_TRUE,
ZFS_SA_ATTRS);
dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, FALSE, NULL);
}
error = dmu_tx_assign(tx, TXG_WAIT);
if (error) {
dmu_tx_abort(tx);
return (error);
}
error = zap_update(os, MASTER_NODE_OBJ, ZPL_VERSION_STR,
8, 1, &newvers, tx);
if (error) {
dmu_tx_commit(tx);
return (error);
}
if (newvers >= ZPL_VERSION_SA && !zfsvfs->z_use_sa) {
uint64_t sa_obj;
ASSERT3U(spa_version(dmu_objset_spa(zfsvfs->z_os)), >=,
SPA_VERSION_SA);
sa_obj = zap_create(os, DMU_OT_SA_MASTER_NODE,
DMU_OT_NONE, 0, tx);
error = zap_add(os, MASTER_NODE_OBJ,
ZFS_SA_ATTRS, 8, 1, &sa_obj, tx);
ASSERT0(error);
VERIFY(0 == sa_set_sa_object(os, sa_obj));
sa_register_update_callback(os, zfs_sa_upgrade);
}
spa_history_log_internal_ds(dmu_objset_ds(os), "upgrade", tx,
"from %llu to %llu", zfsvfs->z_version, newvers);
dmu_tx_commit(tx);
zfsvfs->z_version = newvers;
zfs_set_fuid_feature(zfsvfs);
return (0);
}
/*
* Read a property stored within the master node.
*/
int
zfs_get_zplprop(objset_t *os, zfs_prop_t prop, uint64_t *value)
{
const char *pname;
int error = ENOENT;
/*
* Look up the file system's value for the property. For the
* version property, we look up a slightly different string.
*/
if (prop == ZFS_PROP_VERSION)
pname = ZPL_VERSION_STR;
else
pname = zfs_prop_to_name(prop);
if (os != NULL)
error = zap_lookup(os, MASTER_NODE_OBJ, pname, 8, 1, value);
if (error == ENOENT) {
/* No value set, use the default value */
switch (prop) {
case ZFS_PROP_VERSION:
*value = ZPL_VERSION;
break;
case ZFS_PROP_NORMALIZE:
case ZFS_PROP_UTF8ONLY:
*value = 0;
break;
case ZFS_PROP_CASE:
*value = ZFS_CASE_SENSITIVE;
break;
default:
return (error);
}
error = 0;
}
return (error);
}
#if defined(__FreeBSD_kernel__) || defined(__NetBSD__)
#ifdef _KERNEL
void
zfsvfs_update_fromname(const char *oldname, const char *newname)
{
char tmpbuf[MAXPATHLEN];
struct mount *mp;
char *fromname;
size_t oldlen;
oldlen = strlen(oldname);
#ifdef __NetBSD__
mount_iterator_t *iter;
mountlist_iterator_init(&iter);
while ((mp = mountlist_iterator_next(iter)) != NULL) {
#else
mtx_lock(&mountlist_mtx);
TAILQ_FOREACH(mp, &mountlist, mnt_list) {
#endif
fromname = mp->mnt_stat.f_mntfromname;
if (strcmp(fromname, oldname) == 0) {
(void)strlcpy(fromname, newname,
sizeof(mp->mnt_stat.f_mntfromname));
continue;
}
if (strncmp(fromname, oldname, oldlen) == 0 &&
(fromname[oldlen] == '/' || fromname[oldlen] == '@')) {
(void)snprintf(tmpbuf, sizeof(tmpbuf), "%s%s",
newname, fromname + oldlen);
(void)strlcpy(fromname, tmpbuf,
sizeof(mp->mnt_stat.f_mntfromname));
continue;
}
}
#ifdef __NetBSD__
mountlist_iterator_destroy(iter);
#else
mtx_unlock(&mountlist_mtx);
#endif
}
#endif
#endif