freebsd-nq/module/zfs/zfs_vfsops.c
Brian Behlendorf bcf308227c Remove zfs_ctldir.[ch]
This code is used for snapshot and heavily leverages Solaris
functionality we do not want to reimplement.  These files have
been removed, including references to them, and will be replaced
by a zfs_snap.c/zpl_snap.c implementation which handles snapshots.
2011-02-10 09:27:21 -08:00

1734 lines
43 KiB
C

/*
* 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.
*/
/* Portions Copyright 2010 Robert Milkowski */
#include <sys/types.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/sysmacros.h>
#include <sys/kmem.h>
#include <sys/pathname.h>
#include <sys/vnode.h>
#include <sys/vfs.h>
#include <sys/vfs_opreg.h>
#include <sys/mntent.h>
#include <sys/mount.h>
#include <sys/cmn_err.h>
#include "fs/fs_subr.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/varargs.h>
#include <sys/policy.h>
#include <sys/atomic.h>
#include <sys/mkdev.h>
#include <sys/modctl.h>
#include <sys/refstr.h>
#include <sys/zfs_ioctl.h>
#include <sys/zfs_fuid.h>
#include <sys/bootconf.h>
#include <sys/sunddi.h>
#include <sys/dnlc.h>
#include <sys/dmu_objset.h>
#include <sys/spa_boot.h>
#include <sys/sa.h>
#include "zfs_comutil.h"
#ifdef HAVE_ZPL
/*ARGSUSED*/
int
zfs_sync(vfs_t *vfsp, short flag, cred_t *cr)
{
/*
* Data integrity is job one. We don't want a compromised kernel
* writing to the storage pool, so we never sync during panic.
*/
if (unlikely(oops_in_progress))
return (0);
if (vfsp != NULL) {
/*
* Sync a specific filesystem.
*/
zfsvfs_t *zfsvfs = vfsp->vfs_data;
dsl_pool_t *dp;
ZFS_ENTER(zfsvfs);
dp = dmu_objset_pool(zfsvfs->z_os);
#ifdef HAVE_SHUTDOWN
/*
* If the system is shutting down, then skip any
* filesystems which may exist on a suspended pool.
*
* XXX: This can be implemented using the Linux reboot
* notifiers: {un}register_reboot_notifier().
*/
if (sys_shutdown && spa_suspended(dp->dp_spa)) {
ZFS_EXIT(zfsvfs);
return (0);
}
#endif /* HAVE_SHUTDOWN */
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);
}
EXPORT_SYMBOL(zfs_sync);
static void
atime_changed_cb(void *arg, uint64_t newval)
{
zfsvfs_t *zfsvfs = arg;
if (newval == TRUE) {
zfsvfs->z_atime = TRUE;
vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NOATIME);
vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_ATIME, NULL, 0);
} else {
zfsvfs->z_atime = FALSE;
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? */
zfsvfs->z_vfs->vfs_flag |= VFS_XATTR;
vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NOXATTR);
vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_XATTR, NULL, 0);
} else {
/* XXX locking on vfs_flag? */
zfsvfs->z_vfs->vfs_flag &= ~VFS_XATTR;
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
devices_changed_cb(void *arg, uint64_t newval)
{
zfsvfs_t *zfsvfs = arg;
if (newval == FALSE) {
zfsvfs->z_vfs->vfs_flag |= VFS_NODEVICES;
vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_DEVICES);
vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NODEVICES, NULL, 0);
} else {
zfsvfs->z_vfs->vfs_flag &= ~VFS_NODEVICES;
vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NODEVICES);
vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_DEVICES, 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_inherit_changed_cb(void *arg, uint64_t newval)
{
zfsvfs_t *zfsvfs = arg;
zfsvfs->z_acl_inherit = newval;
}
int
zfs_register_callbacks(vfs_t *vfsp)
{
struct dsl_dataset *ds = NULL;
objset_t *os = NULL;
zfsvfs_t *zfsvfs = NULL;
uint64_t nbmand;
int readonly, do_readonly = B_FALSE;
int setuid, do_setuid = B_FALSE;
int exec, do_exec = B_FALSE;
int devices, do_devices = B_FALSE;
int xattr, do_xattr = B_FALSE;
int atime, do_atime = B_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) ||
!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)) {
devices = B_FALSE;
setuid = B_FALSE;
do_devices = B_TRUE;
do_setuid = B_TRUE;
} else {
if (vfs_optionisset(vfsp, MNTOPT_NODEVICES, NULL)) {
devices = B_FALSE;
do_devices = B_TRUE;
} else if (vfs_optionisset(vfsp, MNTOPT_DEVICES, NULL)) {
devices = B_TRUE;
do_devices = B_TRUE;
}
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;
}
/*
* 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 {
char osname[MAXNAMELEN];
dmu_objset_name(os, osname);
if ((error = dsl_prop_get_integer(osname, "nbmand", &nbmand,
NULL))) {
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...
*/
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,
"devices", devices_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,
"aclinherit", acl_inherit_changed_cb, zfsvfs);
error = error ? error : dsl_prop_register(ds,
"vscan", vscan_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_devices)
devices_changed_cb(zfsvfs, devices);
if (do_xattr)
xattr_changed_cb(zfsvfs, xattr);
if (do_atime)
atime_changed_cb(zfsvfs, atime);
nbmand_changed_cb(zfsvfs, nbmand);
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, "devices", devices_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, "aclinherit", acl_inherit_changed_cb,
zfsvfs);
(void) dsl_prop_unregister(ds, "vscan", vscan_changed_cb, zfsvfs);
return (error);
}
EXPORT_SYMBOL(zfs_register_callbacks);
#endif /* HAVE_ZPL */
static int
zfs_space_delta_cb(dmu_object_type_t bonustype, void *data,
uint64_t *userp, uint64_t *groupp)
{
znode_phys_t *znp = data;
int error = 0;
/*
* Is it a valid type of object to track?
*/
if (bonustype != DMU_OT_ZNODE && bonustype != DMU_OT_SA)
return (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 (EEXIST);
if (bonustype == DMU_OT_ZNODE) {
*userp = znp->zp_uid;
*groupp = znp->zp_gid;
} else {
int hdrsize;
ASSERT(bonustype == DMU_OT_SA);
hdrsize = sa_hdrsize(data);
if (hdrsize != 0) {
*userp = *((uint64_t *)((uintptr_t)data + hdrsize +
SA_UID_OFFSET));
*groupp = *((uint64_t *)((uintptr_t)data + hdrsize +
SA_GID_OFFSET));
} else {
/*
* This should only happen for newly created
* files that haven't had the znode data filled
* in yet.
*/
*userp = 0;
*groupp = 0;
}
}
return (error);
}
#ifdef HAVE_ZPL
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);
default:
return (ENOTSUP);
}
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 (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);
}
EXPORT_SYMBOL(zfs_userspace_many);
/*
* 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 (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 (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);
}
EXPORT_SYMBOL(zfs_userspace_one);
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 (EINVAL);
if (zfsvfs->z_version < ZPL_VERSION_USERSPACE)
return (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, &quota, tx);
}
ASSERT(err == 0);
if (fuid_dirtied)
zfs_fuid_sync(zfsvfs, tx);
dmu_tx_commit(tx);
return (err);
}
EXPORT_SYMBOL(zfs_set_userquota);
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, &quota);
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);
}
EXPORT_SYMBOL(zfs_fuid_overquota);
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));
}
EXPORT_SYMBOL(zfs_owner_overquota);
int
zfsvfs_create(const char *osname, zfsvfs_t **zfvp)
{
objset_t *os;
zfsvfs_t *zfsvfs;
uint64_t zval;
int i, error;
uint64_t sa_obj;
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);
}
/*
* Initialize the zfs-specific filesystem structure.
* Should probably make this a kmem cache, shuffle fields,
* and just bzero up to z_hold_mtx[].
*/
zfsvfs->z_vfs = NULL;
zfsvfs->z_parent = zfsvfs;
zfsvfs->z_max_blksz = SPA_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) {
goto out;
} else if (zfsvfs->z_version >
zfs_zpl_version_map(spa_version(dmu_objset_spa(os)))) {
(void) printk("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)));
error = ENOTSUP;
goto out;
}
if ((error = zfs_get_zplprop(os, ZFS_PROP_NORMALIZE, &zval)) != 0)
goto out;
zfsvfs->z_norm = (int)zval;
if ((error = zfs_get_zplprop(os, ZFS_PROP_UTF8ONLY, &zval)) != 0)
goto out;
zfsvfs->z_utf8 = (zval != 0);
if ((error = zfs_get_zplprop(os, ZFS_PROP_CASE, &zval)) != 0)
goto out;
zfsvfs->z_case = (uint_t)zval;
/*
* 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);
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)
return (error);
} else {
/*
* Pre SA versions file systems should never touch
* either the attribute registration or layout objects.
*/
sa_obj = 0;
}
error = sa_setup(os, sa_obj, zfs_attr_table, ZPL_END,
&zfsvfs->z_attr_table);
if (error)
goto out;
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)
goto out;
ASSERT(zfsvfs->z_root != 0);
error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_UNLINKED_SET, 8, 1,
&zfsvfs->z_unlinkedobj);
if (error)
goto out;
error = zap_lookup(os, MASTER_NODE_OBJ,
zfs_userquota_prop_prefixes[ZFS_PROP_USERQUOTA],
8, 1, &zfsvfs->z_userquota_obj);
if (error && error != ENOENT)
goto out;
error = zap_lookup(os, MASTER_NODE_OBJ,
zfs_userquota_prop_prefixes[ZFS_PROP_GROUPQUOTA],
8, 1, &zfsvfs->z_groupquota_obj);
if (error && error != ENOENT)
goto out;
error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_FUID_TABLES, 8, 1,
&zfsvfs->z_fuid_obj);
if (error && error != ENOENT)
goto out;
error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_SHARES_DIR, 8, 1,
&zfsvfs->z_shares_dir);
if (error && error != ENOENT)
goto out;
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));
rrw_init(&zfsvfs->z_teardown_lock);
rw_init(&zfsvfs->z_teardown_inactive_lock, NULL, RW_DEFAULT, NULL);
rw_init(&zfsvfs->z_fuid_lock, NULL, RW_DEFAULT, NULL);
for (i = 0; i != ZFS_OBJ_MTX_SZ; i++)
mutex_init(&zfsvfs->z_hold_mtx[i], NULL, MUTEX_DEFAULT, NULL);
*zfvp = zfsvfs;
return (0);
out:
dmu_objset_disown(os, zfsvfs);
*zfvp = NULL;
kmem_free(zfsvfs, sizeof (zfsvfs_t));
return (error);
}
static int
zfsvfs_setup(zfsvfs_t *zfsvfs, boolean_t mounting)
{
int error;
error = zfs_register_callbacks(zfsvfs->z_vfs);
if (error)
return (error);
/*
* 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);
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 */
}
return (0);
}
void
zfsvfs_free(zfsvfs_t *zfsvfs)
{
int i;
extern krwlock_t zfsvfs_lock; /* in zfs_znode.c */
/*
* 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);
rrw_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));
}
#ifdef HAVE_FUID_FEATURES
static void
zfs_set_fuid_feature(zfsvfs_t *zfsvfs)
{
zfsvfs->z_use_fuids = USE_FUIDS(zfsvfs->z_version, zfsvfs->z_os);
if (zfsvfs->z_use_fuids && zfsvfs->z_vfs) {
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);
}
zfsvfs->z_use_sa = USE_SA(zfsvfs->z_version, zfsvfs->z_os);
}
#endif /* HAVE_FUID_FEATURES */
int
zfs_domount(vfs_t *vfsp, char *osname)
{
uint64_t recordsize, fsid_guid;
int error = 0;
zfsvfs_t *zfsvfs;
ASSERT(vfsp);
ASSERT(osname);
error = zfsvfs_create(osname, &zfsvfs);
if (error)
return (error);
zfsvfs->z_vfs = vfsp;
/* Initialize the generic filesystem structure. */
vfsp->vfs_bcount = 0;
vfsp->vfs_data = NULL;
if ((error = dsl_prop_get_integer(osname, "recordsize",
&recordsize, NULL)))
goto out;
vfsp->vfs_bsize = recordsize;
vfsp->vfs_flag |= VFS_NOTRUNC;
vfsp->vfs_data = zfsvfs;
/*
* 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);
vfsp->vfs_fsid.val[0] = fsid_guid;
vfsp->vfs_fsid.val[1] = ((fsid_guid>>32) << 8);
#ifdef HAVE_FUID_FEATURES
/*
* 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);
#endif /* HAVE_FUID_FEATURES */
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);
}
if (!zfsvfs->z_issnap)
zfsctl_create(zfsvfs);
out:
if (error) {
dmu_objset_disown(zfsvfs->z_os, zfsvfs);
zfsvfs_free(zfsvfs);
}
return (error);
}
EXPORT_SYMBOL(zfs_domount);
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, "devices", devices_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, "aclinherit",
acl_inherit_changed_cb, zfsvfs) == 0);
VERIFY(dsl_prop_unregister(ds, "vscan",
vscan_changed_cb, zfsvfs) == 0);
}
}
EXPORT_SYMBOL(zfs_unregister_callbacks);
#ifdef HAVE_MLSLABEL
/*
* zfs_check_global_label:
* 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 (EACCES);
return (rdonly ? 0 : EACCES);
}
return (EACCES);
}
#endif /* HAVE_MLSLABEL */
int
zfs_statvfs(vfs_t *vfsp, struct statvfs64 *statp)
{
zfsvfs_t *zfsvfs = vfsp->vfs_data;
dev32_t d32;
uint64_t refdbytes, availbytes, usedobjs, availobjs;
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_frsize = 1UL << SPA_MINBLOCKSHIFT;
statp->f_bsize = zfsvfs->z_max_blksz;
/*
* 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 >> SPA_MINBLOCKSHIFT;
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_favail = statp->f_ffree; /* no "root reservation" */
statp->f_files = statp->f_ffree + usedobjs;
(void) cmpldev(&d32, vfsp->vfs_dev);
statp->f_fsid = d32;
/*
* We're a zfs filesystem.
*/
(void) strcpy(statp->f_basetype, MNTTYPE_ZFS);
statp->f_flag = vf_to_stf(vfsp->vfs_flag);
statp->f_namemax = ZFS_MAXNAMELEN;
/*
* We have all of 32 characters to stuff a string here.
* Is there anything useful we could/should provide?
*/
bzero(statp->f_fstr, sizeof (statp->f_fstr));
ZFS_EXIT(zfsvfs);
return (0);
}
EXPORT_SYMBOL(zfs_statvfs);
int
zfs_root(vfs_t *vfsp, 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);
return (error);
}
EXPORT_SYMBOL(zfs_root);
/*
* 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;
rrw_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);
}
/*
* 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);
rrw_exit(&zfsvfs->z_teardown_lock, FTAG);
return (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) {
ASSERT(ZTOV(zp)->v_count > 0);
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;
rrw_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 (dmu_objset_is_dirty_anywhere(zfsvfs->z_os))
if (!(zfsvfs->z_vfs->vfs_flag & VFS_RDONLY))
txg_wait_synced(dmu_objset_pool(zfsvfs->z_os), 0);
(void) dmu_objset_evict_dbufs(zfsvfs->z_os);
return (0);
}
/*ARGSUSED*/
int
zfs_umount(vfs_t *vfsp, int fflag, cred_t *cr)
{
zfsvfs_t *zfsvfs = vfsp->vfs_data;
objset_t *os;
int ret;
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 &&
(ret = zfsctl_umount_snapshots(vfsp, fflag, cr)) != 0) {
return (ret);
}
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 (EBUSY);
} else {
if (vfsp->vfs_count > 2 ||
zfsvfs->z_ctldir->v_count > 1)
return (EBUSY);
}
}
vfsp->vfs_flag |= VFS_UNMOUNTED;
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);
return (0);
}
EXPORT_SYMBOL(zfs_umount);
int
zfs_vget(vfs_t *vfsp, vnode_t **vpp, fid_t *fidp)
{
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, NULL, NULL, NULL) == 0);
} else {
VN_HOLD(*vpp);
}
ZFS_EXIT(zfsvfs);
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);
}
(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 (EINVAL);
}
*vpp = ZTOV(zp);
if (*vpp)
zfs_inode_update(VTOZ(*vpp));
ZFS_EXIT(zfsvfs);
return (0);
}
EXPORT_SYMBOL(zfs_vget);
/*
* 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.
*/
int
zfs_suspend_fs(zfsvfs_t *zfsvfs)
{
int error;
if ((error = zfsvfs_teardown(zfsvfs, B_FALSE)) != 0)
return (error);
dmu_objset_disown(zfsvfs->z_os, zfsvfs);
return (0);
}
EXPORT_SYMBOL(zfs_suspend_fs);
/*
* Reopen zfsvfs_t::z_os and release VOPs.
*/
int
zfs_resume_fs(zfsvfs_t *zfsvfs, const char *osname)
{
int err, err2;
ASSERT(RRW_WRITE_HELD(&zfsvfs->z_teardown_lock));
ASSERT(RW_WRITE_HELD(&zfsvfs->z_teardown_inactive_lock));
err = dmu_objset_own(osname, DMU_OST_ZFS, B_FALSE, zfsvfs,
&zfsvfs->z_os);
if (err) {
zfsvfs->z_os = NULL;
} else {
znode_t *zp;
uint64_t sa_obj = 0;
err2 = zap_lookup(zfsvfs->z_os, MASTER_NODE_OBJ,
ZFS_SA_ATTRS, 8, 1, &sa_obj);
if ((err || err2) && zfsvfs->z_version >= ZPL_VERSION_SA)
goto bail;
if ((err = sa_setup(zfsvfs->z_os, sa_obj,
zfs_attr_table, ZPL_END, &zfsvfs->z_attr_table)) != 0)
goto bail;
VERIFY(zfsvfs_setup(zfsvfs, B_FALSE) == 0);
/*
* 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);
rrw_exit(&zfsvfs->z_teardown_lock, FTAG);
if (err) {
/*
* Since we couldn't reopen zfsvfs::z_os, force
* unmount this file system.
*/
if (vn_vfswlock(zfsvfs->z_vfs->vfs_vnodecovered) == 0)
(void) dounmount(zfsvfs->z_vfs, MS_FORCE, CRED());
}
return (err);
}
EXPORT_SYMBOL(zfs_resume_fs);
static void
zfs_freevfs(vfs_t *vfsp)
{
zfsvfs_t *zfsvfs = vfsp->vfs_data;
zfsvfs_free(zfsvfs);
}
#endif /* HAVE_ZPL */
void
zfs_init(void)
{
zfsctl_init();
zfs_znode_init();
dmu_objset_register_type(DMU_OST_ZFS, zfs_space_delta_cb);
}
void
zfs_fini(void)
{
zfsctl_fini();
zfs_znode_fini();
}
#ifdef HAVE_ZPL
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 (EINVAL);
if (newvers < zfsvfs->z_version)
return (EINVAL);
if (zfs_spa_version_map(newvers) >
spa_version(dmu_objset_spa(zfsvfs->z_os)))
return (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);
ASSERT3U(error, ==, 0);
VERIFY(0 == sa_set_sa_object(os, sa_obj));
sa_register_update_callback(os, zfs_sa_upgrade);
}
spa_history_log_internal(LOG_DS_UPGRADE,
dmu_objset_spa(os), tx, "oldver=%llu newver=%llu dataset = %llu",
zfsvfs->z_version, newvers, dmu_objset_id(os));
dmu_tx_commit(tx);
zfsvfs->z_version = newvers;
#ifdef HAVE_FUID_FEATURES
if (zfsvfs->z_version >= ZPL_VERSION_FUID)
zfs_set_fuid_feature(zfsvfs);
#endif /* HAVE_FUID_FEATURES */
return (0);
}
EXPORT_SYMBOL(zfs_set_version);
#endif /* HAVE_ZPL */
/*
* 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);
}