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|
/*
* 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 2007 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#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/spa.h>
#include <sys/zap.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/sunddi.h>
#include <sys/dnlc.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_debug_level = 0;
TUNABLE_INT("vfs.zfs.debug", &zfs_debug_level);
SYSCTL_INT(_vfs_zfs, OID_AUTO, debug, CTLFLAG_RW, &zfs_debug_level, 0,
"Debug level");
static int zfs_mount(vfs_t *vfsp, kthread_t *td);
static int zfs_umount(vfs_t *vfsp, int fflag, kthread_t *td);
static int zfs_root(vfs_t *vfsp, int flags, vnode_t **vpp, kthread_t *td);
static int zfs_statfs(vfs_t *vfsp, struct statfs *statp, kthread_t *td);
static int zfs_vget(vfs_t *vfsp, ino_t ino, int flags, vnode_t **vpp);
static int zfs_sync(vfs_t *vfsp, int waitfor, kthread_t *td);
static int zfs_fhtovp(vfs_t *vfsp, fid_t *fidp, vnode_t **vpp);
static void zfs_objset_close(zfsvfs_t *zfsvfs);
static void zfs_freevfs(vfs_t *vfsp);
static 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_fhtovp = zfs_fhtovp,
};
VFS_SET(zfs_vfsops, zfs, VFCF_JAIL);
/*
* 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, kthread_t *td)
{
/*
* 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);
if (vfsp != NULL) {
/*
* Sync a specific filesystem.
*/
zfsvfs_t *zfsvfs = vfsp->vfs_data;
int error;
error = vfs_stdsync(vfsp, waitfor, td);
if (error != 0)
return (error);
ZFS_ENTER(zfsvfs);
if (zfsvfs->z_log != NULL)
zil_commit(zfsvfs->z_log, UINT64_MAX, 0);
else
txg_wait_synced(dmu_objset_pool(zfsvfs->z_os), 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);
}
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;
if (newval < SPA_MINBLOCKSIZE ||
newval > SPA_MAXBLOCKSIZE || !ISP2(newval))
newval = SPA_MAXBLOCKSIZE;
zfsvfs->z_max_blksz = newval;
zfsvfs->z_vfs->vfs_bsize = 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);
}
}
static void
snapdir_changed_cb(void *arg, uint64_t newval)
{
zfsvfs_t *zfsvfs = arg;
zfsvfs->z_show_ctldir = 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_refresh_properties(vfs_t *vfsp)
{
zfsvfs_t *zfsvfs = vfsp->vfs_data;
/*
* Remount operations default to "rw" unless "ro" is explicitly
* specified.
*/
if (vfs_optionisset(vfsp, MNTOPT_RO, NULL)) {
readonly_changed_cb(zfsvfs, B_TRUE);
} else {
if (!dmu_objset_is_snapshot(zfsvfs->z_os))
readonly_changed_cb(zfsvfs, B_FALSE);
else if (vfs_optionisset(vfsp, MNTOPT_RW, NULL))
return (EROFS);
}
if (vfs_optionisset(vfsp, MNTOPT_NOSUID, NULL)) {
setuid_changed_cb(zfsvfs, B_FALSE);
} else {
if (vfs_optionisset(vfsp, MNTOPT_NOSETUID, NULL))
setuid_changed_cb(zfsvfs, B_FALSE);
else if (vfs_optionisset(vfsp, MNTOPT_SETUID, NULL))
setuid_changed_cb(zfsvfs, B_TRUE);
}
if (vfs_optionisset(vfsp, MNTOPT_NOEXEC, NULL))
exec_changed_cb(zfsvfs, B_FALSE);
else if (vfs_optionisset(vfsp, MNTOPT_EXEC, NULL))
exec_changed_cb(zfsvfs, B_TRUE);
if (vfs_optionisset(vfsp, MNTOPT_ATIME, NULL))
atime_changed_cb(zfsvfs, B_TRUE);
else if (vfs_optionisset(vfsp, MNTOPT_NOATIME, NULL))
atime_changed_cb(zfsvfs, B_FALSE);
if (vfs_optionisset(vfsp, MNTOPT_XATTR, NULL))
xattr_changed_cb(zfsvfs, B_TRUE);
else if (vfs_optionisset(vfsp, MNTOPT_NOXATTR, NULL))
xattr_changed_cb(zfsvfs, B_FALSE);
return (0);
}
static int
zfs_register_callbacks(vfs_t *vfsp)
{
struct dsl_dataset *ds = NULL;
objset_t *os = NULL;
zfsvfs_t *zfsvfs = NULL;
int readonly, do_readonly = FALSE;
int setuid, do_setuid = FALSE;
int exec, do_exec = FALSE;
int xattr, do_xattr = FALSE;
int error = 0;
ASSERT(vfsp);
zfsvfs = vfsp->vfs_data;
ASSERT(zfsvfs);
os = zfsvfs->z_os;
/*
* 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)) {
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;
}
/*
* 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...
*/
ds = dmu_objset_ds(os);
error = dsl_prop_register(ds, "atime", atime_changed_cb, zfsvfs);
error = error ? error : dsl_prop_register(ds,
"xattr", xattr_changed_cb, zfsvfs);
error = error ? error : dsl_prop_register(ds,
"recordsize", blksz_changed_cb, zfsvfs);
error = error ? error : dsl_prop_register(ds,
"readonly", readonly_changed_cb, zfsvfs);
error = error ? error : dsl_prop_register(ds,
"setuid", setuid_changed_cb, zfsvfs);
error = error ? error : dsl_prop_register(ds,
"exec", exec_changed_cb, zfsvfs);
error = error ? error : dsl_prop_register(ds,
"snapdir", snapdir_changed_cb, zfsvfs);
error = error ? error : dsl_prop_register(ds,
"aclmode", acl_mode_changed_cb, zfsvfs);
error = error ? error : dsl_prop_register(ds,
"aclinherit", acl_inherit_changed_cb, zfsvfs);
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);
return (0);
unregister:
/*
* We may attempt to unregister some callbacks that are not
* registered, but this is OK; it will simply return ENOMSG,
* which we will ignore.
*/
(void) dsl_prop_unregister(ds, "atime", atime_changed_cb, zfsvfs);
(void) dsl_prop_unregister(ds, "xattr", xattr_changed_cb, zfsvfs);
(void) dsl_prop_unregister(ds, "recordsize", blksz_changed_cb, zfsvfs);
(void) dsl_prop_unregister(ds, "readonly", readonly_changed_cb, zfsvfs);
(void) dsl_prop_unregister(ds, "setuid", setuid_changed_cb, zfsvfs);
(void) dsl_prop_unregister(ds, "exec", exec_changed_cb, zfsvfs);
(void) dsl_prop_unregister(ds, "snapdir", snapdir_changed_cb, zfsvfs);
(void) dsl_prop_unregister(ds, "aclmode", acl_mode_changed_cb, zfsvfs);
(void) dsl_prop_unregister(ds, "aclinherit", acl_inherit_changed_cb,
zfsvfs);
return (error);
}
static int
zfs_domount(vfs_t *vfsp, char *osname, kthread_t *td)
{
cred_t *cr = td->td_ucred;
uint64_t recordsize, readonly;
int error = 0;
int mode;
zfsvfs_t *zfsvfs;
znode_t *zp = NULL;
ASSERT(vfsp);
ASSERT(osname);
/*
* Initialize the zfs-specific filesystem structure.
* Should probably make this a kmem cache, shuffle fields,
* and just bzero up to z_hold_mtx[].
*/
zfsvfs = kmem_zalloc(sizeof (zfsvfs_t), KM_SLEEP);
zfsvfs->z_vfs = vfsp;
zfsvfs->z_parent = zfsvfs;
zfsvfs->z_assign = TXG_NOWAIT;
zfsvfs->z_max_blksz = SPA_MAXBLOCKSIZE;
zfsvfs->z_show_ctldir = ZFS_SNAPDIR_VISIBLE;
mutex_init(&zfsvfs->z_znodes_lock, NULL, MUTEX_DEFAULT, NULL);
list_create(&zfsvfs->z_all_znodes, sizeof (znode_t),
offsetof(znode_t, z_link_node));
rw_init(&zfsvfs->z_um_lock, NULL, RW_DEFAULT, NULL);
if (error = dsl_prop_get_integer(osname, "recordsize", &recordsize,
NULL))
goto out;
zfsvfs->z_vfs->vfs_bsize = recordsize;
vfsp->vfs_data = zfsvfs;
vfsp->mnt_flag |= MNT_LOCAL;
vfsp->mnt_kern_flag |= MNTK_MPSAFE;
vfsp->mnt_kern_flag |= MNTK_LOOKUP_SHARED;
if (error = dsl_prop_get_integer(osname, "readonly", &readonly, NULL))
goto out;
if (readonly)
mode = DS_MODE_PRIMARY | DS_MODE_READONLY;
else
mode = DS_MODE_PRIMARY;
error = dmu_objset_open(osname, DMU_OST_ZFS, mode, &zfsvfs->z_os);
if (error == EROFS) {
mode = DS_MODE_PRIMARY | DS_MODE_READONLY;
error = dmu_objset_open(osname, DMU_OST_ZFS, mode,
&zfsvfs->z_os);
}
if (error)
goto out;
if (error = zfs_init_fs(zfsvfs, &zp, cr))
goto out;
if (dmu_objset_is_snapshot(zfsvfs->z_os)) {
uint64_t xattr;
ASSERT(mode & DS_MODE_READONLY);
atime_changed_cb(zfsvfs, B_FALSE);
readonly_changed_cb(zfsvfs, B_TRUE);
if (error = dsl_prop_get_integer(osname, "xattr", &xattr, NULL))
goto out;
xattr_changed_cb(zfsvfs, xattr);
zfsvfs->z_issnap = B_TRUE;
} else {
error = zfs_register_callbacks(vfsp);
if (error)
goto out;
zfs_unlinked_drain(zfsvfs);
/*
* Parse and replay the intent log.
*/
zil_replay(zfsvfs->z_os, zfsvfs, &zfsvfs->z_assign,
zfs_replay_vector);
if (!zil_disable)
zfsvfs->z_log = zil_open(zfsvfs->z_os, zfs_get_data);
}
vfs_mountedfrom(vfsp, osname);
if (!zfsvfs->z_issnap)
zfsctl_create(zfsvfs);
out:
if (error) {
if (zfsvfs->z_os)
dmu_objset_close(zfsvfs->z_os);
rw_destroy(&zfsvfs->z_um_lock);
mutex_destroy(&zfsvfs->z_znodes_lock);
kmem_free(zfsvfs, sizeof (zfsvfs_t));
} else {
atomic_add_32(&zfs_active_fs_count, 1);
}
return (error);
}
void
zfs_unregister_callbacks(zfsvfs_t *zfsvfs)
{
objset_t *os = zfsvfs->z_os;
struct dsl_dataset *ds;
/*
* Unregister properties.
*/
if (!dmu_objset_is_snapshot(os)) {
ds = dmu_objset_ds(os);
VERIFY(dsl_prop_unregister(ds, "atime", atime_changed_cb,
zfsvfs) == 0);
VERIFY(dsl_prop_unregister(ds, "xattr", xattr_changed_cb,
zfsvfs) == 0);
VERIFY(dsl_prop_unregister(ds, "recordsize", blksz_changed_cb,
zfsvfs) == 0);
VERIFY(dsl_prop_unregister(ds, "readonly", readonly_changed_cb,
zfsvfs) == 0);
VERIFY(dsl_prop_unregister(ds, "setuid", setuid_changed_cb,
zfsvfs) == 0);
VERIFY(dsl_prop_unregister(ds, "exec", exec_changed_cb,
zfsvfs) == 0);
VERIFY(dsl_prop_unregister(ds, "snapdir", snapdir_changed_cb,
zfsvfs) == 0);
VERIFY(dsl_prop_unregister(ds, "aclmode", acl_mode_changed_cb,
zfsvfs) == 0);
VERIFY(dsl_prop_unregister(ds, "aclinherit",
acl_inherit_changed_cb, zfsvfs) == 0);
}
}
/*ARGSUSED*/
static int
zfs_mount(vfs_t *vfsp, kthread_t *td)
{
char *from;
int error;
/*
* 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)
return (zfs_refresh_properties(vfsp));
if (vfs_getopt(vfsp->mnt_optnew, "from", (void **)&from, NULL))
return (EINVAL);
DROP_GIANT();
error = zfs_domount(vfsp, from, td);
PICKUP_GIANT();
return (error);
}
static int
zfs_statfs(vfs_t *vfsp, struct statfs *statp, kthread_t *td)
{
zfsvfs_t *zfsvfs = vfsp->vfs_data;
uint64_t refdbytes, availbytes, usedobjs, availobjs;
statp->f_version = STATFS_VERSION;
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 = zfsvfs->z_vfs->vfs_bsize;
statp->f_iosize = zfsvfs->z_vfs->vfs_bsize;
/*
* 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) / statp->f_bsize;
statp->f_bfree = availbytes / statp->f_bsize;
statp->f_bavail = statp->f_bfree; /* no root reservation */
/*
* 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);
statp->f_files = statp->f_ffree + usedobjs;
/*
* 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));
statp->f_namemax = ZFS_MAXNAMELEN;
ZFS_EXIT(zfsvfs);
return (0);
}
static int
zfs_root(vfs_t *vfsp, int flags, vnode_t **vpp, kthread_t *td)
{
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);
error = vn_lock(*vpp, flags, td);
(*vpp)->v_vflag |= VV_ROOT;
}
ZFS_EXIT(zfsvfs);
return (error);
}
/*ARGSUSED*/
static int
zfs_umount(vfs_t *vfsp, int fflag, kthread_t *td)
{
zfsvfs_t *zfsvfs = vfsp->vfs_data;
cred_t *cr = td->td_ucred;
int ret;
if ((ret = secpolicy_fs_unmount(cr, vfsp)) != 0)
return (ret);
(void) dnlc_purge_vfsp(vfsp, 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);
ret = vflush(vfsp, 0, 0, td);
ASSERT(ret == EBUSY);
if (!(fflag & MS_FORCE)) {
if (zfsvfs->z_ctldir->v_count > 1)
return (EBUSY);
ASSERT(zfsvfs->z_ctldir->v_count == 1);
}
zfsctl_destroy(zfsvfs);
ASSERT(zfsvfs->z_ctldir == NULL);
}
/*
* Flush all the files.
*/
ret = vflush(vfsp, 1, (fflag & MS_FORCE) ? FORCECLOSE : 0, td);
if (ret != 0) {
if (!zfsvfs->z_issnap) {
zfsctl_create(zfsvfs);
ASSERT(zfsvfs->z_ctldir != NULL);
}
return (ret);
}
if (fflag & MS_FORCE) {
MNT_ILOCK(vfsp);
vfsp->mnt_kern_flag |= MNTK_UNMOUNTF;
MNT_IUNLOCK(vfsp);
zfsvfs->z_unmounted1 = B_TRUE;
/*
* Wait for all zfs threads to leave zfs.
* Grabbing a rwlock as reader in all vops and
* as writer here doesn't work because it too easy to get
* multiple reader enters as zfs can re-enter itself.
* This can lead to deadlock if there is an intervening
* rw_enter as writer.
* So a file system threads ref count (z_op_cnt) is used.
* A polling loop on z_op_cnt may seem inefficient, but
* - this saves all threads on exit from having to grab a
* mutex in order to cv_signal
* - only occurs on forced unmount in the rare case when
* there are outstanding threads within the file system.
*/
while (zfsvfs->z_op_cnt) {
delay(1);
}
}
zfs_objset_close(zfsvfs);
VFS_RELE(vfsp);
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_ENTER(zfsvfs);
err = zfs_zget(zfsvfs, ino, &zp);
if (err == 0 && zp->z_unlinked) {
VN_RELE(ZTOV(zp));
err = EINVAL;
}
if (err != 0)
*vpp = NULL;
else {
*vpp = ZTOV(zp);
vn_lock(*vpp, flags, curthread);
}
ZFS_EXIT(zfsvfs);
return (0);
}
static int
zfs_fhtovp(vfs_t *vfsp, fid_t *fidp, vnode_t **vpp)
{
kthread_t *td = curthread;
zfsvfs_t *zfsvfs = vfsp->vfs_data;
znode_t *zp;
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 (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 (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 (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)) {
*vpp = zfsvfs->z_ctldir;
ASSERT(*vpp != NULL);
if (object == ZFSCTL_INO_SNAPDIR) {
VERIFY(zfsctl_root_lookup(*vpp, "snapshot", vpp, NULL,
0, NULL, NULL) == 0);
} else {
VN_HOLD(*vpp);
}
ZFS_EXIT(zfsvfs);
/* XXX: LK_RETRY? */
vn_lock(*vpp, LK_EXCLUSIVE | LK_RETRY, td);
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 (err);
}
zp_gen = zp->z_phys->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 (EINVAL);
}
*vpp = ZTOV(zp);
/* XXX: LK_RETRY? */
vn_lock(*vpp, LK_EXCLUSIVE | LK_RETRY, td);
vnode_create_vobject(*vpp, zp->z_phys->zp_size, td);
ZFS_EXIT(zfsvfs);
return (0);
}
static void
zfs_objset_close(zfsvfs_t *zfsvfs)
{
znode_t *zp, *nextzp;
objset_t *os = zfsvfs->z_os;
/*
* For forced unmount, at this point all vops except zfs_inactive
* are erroring EIO. We need to now suspend zfs_inactive threads
* while we are freeing dbufs before switching zfs_inactive
* to use behaviour without a objset.
*/
rw_enter(&zfsvfs->z_um_lock, RW_WRITER);
/*
* Release all holds on dbufs
* Note, although we have stopped all other vop threads and
* zfs_inactive(), the dmu can callback via znode_pageout_func()
* which can zfs_znode_free() the znode.
* So we lock z_all_znodes; search the list for a held
* dbuf; drop the lock (we know zp can't disappear if we hold
* a dbuf lock; then regrab the lock and restart.
*/
mutex_enter(&zfsvfs->z_znodes_lock);
for (zp = list_head(&zfsvfs->z_all_znodes); zp; zp = nextzp) {
nextzp = list_next(&zfsvfs->z_all_znodes, zp);
if (zp->z_dbuf_held) {
/* dbufs should only be held when force unmounting */
zp->z_dbuf_held = 0;
mutex_exit(&zfsvfs->z_znodes_lock);
dmu_buf_rele(zp->z_dbuf, NULL);
/* Start again */
mutex_enter(&zfsvfs->z_znodes_lock);
nextzp = list_head(&zfsvfs->z_all_znodes);
}
}
mutex_exit(&zfsvfs->z_znodes_lock);
/*
* Unregister properties.
*/
if (!dmu_objset_is_snapshot(os))
zfs_unregister_callbacks(zfsvfs);
/*
* Switch zfs_inactive to behaviour without an objset.
* It just tosses cached pages and frees the znode & vnode.
* Then re-enable zfs_inactive threads in that new behaviour.
*/
zfsvfs->z_unmounted2 = B_TRUE;
rw_exit(&zfsvfs->z_um_lock); /* re-enable any zfs_inactive threads */
/*
* Close the zil. 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;
}
/*
* Evict all dbufs so that cached znodes will be freed
*/
if (dmu_objset_evict_dbufs(os, 1)) {
txg_wait_synced(dmu_objset_pool(zfsvfs->z_os), 0);
(void) dmu_objset_evict_dbufs(os, 0);
}
/*
* Finally close the objset
*/
dmu_objset_close(os);
}
static void
zfs_freevfs(vfs_t *vfsp)
{
zfsvfs_t *zfsvfs = vfsp->vfs_data;
int i;
for (i = 0; i != ZFS_OBJ_MTX_SZ; i++)
mutex_destroy(&zfsvfs->z_hold_mtx[i]);
rw_destroy(&zfsvfs->z_um_lock);
mutex_destroy(&zfsvfs->z_znodes_lock);
kmem_free(zfsvfs, sizeof (zfsvfs_t));
atomic_add_32(&zfs_active_fs_count, -1);
}
void
zfs_init(void)
{
printf("ZFS filesystem version " ZFS_VERSION_STRING "\n");
/*
* Initialize .zfs directory structures
*/
zfsctl_init();
/*
* Initialize znode cache, vnode ops, etc...
*/
zfs_znode_init();
}
void
zfs_fini(void)
{
zfsctl_fini();
zfs_znode_fini();
}
int
zfs_busy(void)
{
return (zfs_active_fs_count != 0);
}
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