static int
dmu_objset_snapshot_one(char *name, void *arg)
{
struct snaparg *sn = arg;
objset_t *os;
int err;
(void) strcpy(sn->failed, name);
/*
* Check permissions only when requested. This only applies when
* doing a recursive snapshot. The permission checks for the starting
* dataset have already been performed in zfs_secpolicy_snapshot()
*/
if (sn->checkperms == B_TRUE &&
(err = zfs_secpolicy_snapshot_perms(name, CRED())))
return (err);
err = dmu_objset_open(name, DMU_OST_ANY, DS_MODE_USER, &os);
if (err != 0)
return (err);
/* If the objset is in an inconsistent state, return busy */
if (os->os->os_dsl_dataset->ds_phys->ds_flags & DS_FLAG_INCONSISTENT) {
dmu_objset_close(os);
return (EBUSY);
}
/*
* NB: we need to wait for all in-flight changes to get to disk,
* so that we snapshot those changes. zil_suspend does this as
* a side effect.
*/
err = zil_suspend(dmu_objset_zil(os));
if (err == 0) {
struct osnode *osn;
dsl_sync_task_create(sn->dstg, dsl_dataset_snapshot_check,
dsl_dataset_snapshot_sync, os->os->os_dsl_dataset,
sn->snapname, 3);
osn = kmem_alloc(sizeof (struct osnode), KM_SLEEP);
osn->os = os;
list_insert_tail(&sn->objsets, osn);
} else {
dmu_objset_close(os);
}
return (err);
}
/* ARGSUSED */
int
zil_clear_log_chain(char *osname, void *txarg)
{
zilog_t *zilog;
zil_header_t *zh;
objset_t *os;
dmu_tx_t *tx;
int error;
error = dmu_objset_open(osname, DMU_OST_ANY, DS_MODE_USER, &os);
if (error) {
cmn_err(CE_WARN, "can't open objset for %s", osname);
return (0);
}
zilog = dmu_objset_zil(os);
tx = dmu_tx_create(zilog->zl_os);
(void) dmu_tx_assign(tx, TXG_WAIT);
zh = zil_header_in_syncing_context(zilog);
BP_ZERO(&zh->zh_log);
dsl_dataset_dirty(dmu_objset_ds(os), tx);
dmu_tx_commit(tx);
dmu_objset_close(os);
return (0);
}
int
dmu_objset_snapshot(char *fsname, char *snapname, boolean_t recursive)
{
dsl_sync_task_t *dst;
struct osnode *osn;
struct snaparg sn = { 0 };
spa_t *spa;
int err;
(void) strcpy(sn.failed, fsname);
err = spa_open(fsname, &spa, FTAG);
if (err)
return (err);
sn.dstg = dsl_sync_task_group_create(spa_get_dsl(spa));
sn.snapname = snapname;
list_create(&sn.objsets, sizeof (struct osnode),
offsetof(struct osnode, node));
if (recursive) {
sn.checkperms = B_TRUE;
err = dmu_objset_find(fsname,
dmu_objset_snapshot_one, &sn, DS_FIND_CHILDREN);
} else {
sn.checkperms = B_FALSE;
err = dmu_objset_snapshot_one(fsname, &sn);
}
if (err)
goto out;
err = dsl_sync_task_group_wait(sn.dstg);
for (dst = list_head(&sn.dstg->dstg_tasks); dst;
dst = list_next(&sn.dstg->dstg_tasks, dst)) {
dsl_dataset_t *ds = dst->dst_arg1;
if (dst->dst_err)
dsl_dataset_name(ds, sn.failed);
}
out:
while (osn = list_head(&sn.objsets)) {
list_remove(&sn.objsets, osn);
zil_resume(dmu_objset_zil(osn->os));
dmu_objset_close(osn->os);
kmem_free(osn, sizeof (struct osnode));
}
list_destroy(&sn.objsets);
if (err)
(void) strcpy(fsname, sn.failed);
dsl_sync_task_group_destroy(sn.dstg);
spa_close(spa, FTAG);
return (err);
}
int
zil_claim(char *osname, void *txarg)
{
dmu_tx_t *tx = txarg;
uint64_t first_txg = dmu_tx_get_txg(tx);
zilog_t *zilog;
zil_header_t *zh;
objset_t *os;
int error;
error = dmu_objset_open(osname, DMU_OST_ANY, DS_MODE_USER, &os);
if (error) {
cmn_err(CE_WARN, "can't open objset for %s", osname);
return (0);
}
zilog = dmu_objset_zil(os);
zh = zil_header_in_syncing_context(zilog);
/*
* Record here whether the zil has any records to replay.
* If the header block pointer is null or the block points
* to the stubby then we know there are no valid log records.
* We use the header to store this state as the the zilog gets
* freed later in dmu_objset_close().
* The flags (and the rest of the header fields) are cleared in
* zil_sync() as a result of a zil_destroy(), after replaying the log.
*
* Note, the intent log can be empty but still need the
* stubby to be claimed.
*/
if (!zil_empty(zilog))
zh->zh_flags |= ZIL_REPLAY_NEEDED;
/*
* Claim all log blocks if we haven't already done so, and remember
* the highest claimed sequence number. This ensures that if we can
* read only part of the log now (e.g. due to a missing device),
* but we can read the entire log later, we will not try to replay
* or destroy beyond the last block we successfully claimed.
*/
ASSERT3U(zh->zh_claim_txg, <=, first_txg);
if (zh->zh_claim_txg == 0 && !BP_IS_HOLE(&zh->zh_log)) {
zh->zh_claim_txg = first_txg;
zh->zh_claim_seq = zil_parse(zilog, zil_claim_log_block,
zil_claim_log_record, tx, first_txg);
dsl_dataset_dirty(dmu_objset_ds(os), tx);
}
ASSERT3U(first_txg, ==, (spa_last_synced_txg(zilog->zl_spa) + 1));
dmu_objset_close(os);
return (0);
}
/* ARGSUSED */
int
zil_check_log_chain(char *osname, void *txarg)
{
zilog_t *zilog;
zil_header_t *zh;
blkptr_t blk;
arc_buf_t *abuf;
objset_t *os;
char *lrbuf;
zil_trailer_t *ztp;
int error;
error = dmu_objset_open(osname, DMU_OST_ANY, DS_MODE_USER, &os);
if (error) {
cmn_err(CE_WARN, "can't open objset for %s", osname);
return (0);
}
zilog = dmu_objset_zil(os);
zh = zil_header_in_syncing_context(zilog);
blk = zh->zh_log;
if (BP_IS_HOLE(&blk)) {
dmu_objset_close(os);
return (0); /* no chain */
}
for (;;) {
error = zil_read_log_block(zilog, &blk, &abuf);
if (error)
break;
lrbuf = abuf->b_data;
ztp = (zil_trailer_t *)(lrbuf + BP_GET_LSIZE(&blk)) - 1;
blk = ztp->zit_next_blk;
VERIFY(arc_buf_remove_ref(abuf, &abuf) == 1);
}
dmu_objset_close(os);
if (error == ECKSUM)
return (0); /* normal end of chain */
return (error);
}
int
dmu_objset_snapshot(char *fsname, char *snapname,
nvlist_t *props, boolean_t recursive)
{
dsl_sync_task_t *dst;
struct snaparg *sn;
spa_t *spa;
int err;
sn = kmem_alloc(sizeof (struct snaparg), KM_SLEEP);
(void) strcpy(sn->failed, fsname);
err = spa_open(fsname, &spa, FTAG);
if (err) {
kmem_free(sn, sizeof (struct snaparg));
return (err);
}
sn->dstg = dsl_sync_task_group_create(spa_get_dsl(spa));
sn->snapname = snapname;
sn->props = props;
if (recursive) {
sn->checkperms = B_TRUE;
err = dmu_objset_find(fsname,
dmu_objset_snapshot_one, sn, DS_FIND_CHILDREN);
} else {
sn->checkperms = B_FALSE;
err = dmu_objset_snapshot_one(fsname, sn);
}
if (err == 0)
err = dsl_sync_task_group_wait(sn->dstg);
for (dst = list_head(&sn->dstg->dstg_tasks); dst;
dst = list_next(&sn->dstg->dstg_tasks, dst)) {
objset_t *os = dst->dst_arg1;
dsl_dataset_t *ds = os->os->os_dsl_dataset;
if (dst->dst_err)
dsl_dataset_name(ds, sn->failed);
zil_resume(dmu_objset_zil(os));
dmu_objset_close(os);
}
if (err)
(void) strcpy(fsname, sn->failed);
dsl_sync_task_group_destroy(sn->dstg);
spa_close(spa, FTAG);
kmem_free(sn, sizeof (struct snaparg));
return (err);
}
int
zfs_set_version(const char *name, uint64_t newvers)
{
int error;
objset_t *os;
dmu_tx_t *tx;
uint64_t curvers;
/*
* XXX for now, require that the filesystem be unmounted. Would
* be nice to find the zfsvfs_t and just update that if
* possible.
*/
if (newvers < ZPL_VERSION_INITIAL || newvers > ZPL_VERSION)
return (EINVAL);
error = dmu_objset_open(name, DMU_OST_ZFS, DS_MODE_PRIMARY, &os);
if (error)
return (error);
error = zap_lookup(os, MASTER_NODE_OBJ, ZPL_VERSION_STR,
8, 1, &curvers);
if (error)
goto out;
if (newvers < curvers) {
error = EINVAL;
goto out;
}
tx = dmu_tx_create(os);
dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, 0, ZPL_VERSION_STR);
error = dmu_tx_assign(tx, TXG_WAIT);
if (error) {
dmu_tx_abort(tx);
goto out;
}
error = zap_update(os, MASTER_NODE_OBJ, ZPL_VERSION_STR, 8, 1,
&newvers, tx);
spa_history_internal_log(LOG_DS_UPGRADE,
dmu_objset_spa(os), tx, CRED(),
"oldver=%llu newver=%llu dataset = %llu", curvers, newvers,
dmu_objset_id(os));
dmu_tx_commit(tx);
out:
dmu_objset_close(os);
return (error);
}
/*
* 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, char *name, int *mode)
{
int error;
if ((error = zfsvfs_teardown(zfsvfs, B_FALSE)) != 0)
return (error);
*mode = zfsvfs->z_os->os_mode;
dmu_objset_name(zfsvfs->z_os, name);
dmu_objset_close(zfsvfs->z_os);
return (0);
}
/* ARGSUSED */
int
zil_vdev_offline(char *osname, void *arg)
{
objset_t *os;
zilog_t *zilog;
int error;
error = dmu_objset_open(osname, DMU_OST_ANY, DS_MODE_USER, &os);
if (error)
return (error);
zilog = dmu_objset_zil(os);
if (zil_suspend(zilog) != 0)
error = EEXIST;
else
zil_resume(zilog);
dmu_objset_close(os);
return (error);
}
/*
* Remove minor node for the specified volume.
*/
int
zvol_remove_minor(zfs_cmd_t *zc)
{
zvol_state_t *zv;
char namebuf[30];
mutex_enter(&zvol_state_lock);
if ((zv = zvol_minor_lookup(zc->zc_name)) == NULL) {
mutex_exit(&zvol_state_lock);
return (ENXIO);
}
if (zv->zv_total_opens != 0) {
mutex_exit(&zvol_state_lock);
return (EBUSY);
}
(void) sprintf(namebuf, "%uc,raw", zv->zv_minor);
ddi_remove_minor_node(zfs_dip, namebuf);
(void) sprintf(namebuf, "%uc", zv->zv_minor);
ddi_remove_minor_node(zfs_dip, namebuf);
VERIFY(dsl_prop_unregister(dmu_objset_ds(zv->zv_objset),
"readonly", zvol_readonly_changed_cb, zv) == 0);
zil_close(zv->zv_zilog);
zv->zv_zilog = NULL;
dmu_objset_close(zv->zv_objset);
zv->zv_objset = NULL;
ddi_soft_state_free(zvol_state, zv->zv_minor);
zvol_minors--;
mutex_exit(&zvol_state_lock);
return (0);
}
/* called from zpl */
int
dmu_objset_open(const char *name, dmu_objset_type_t type, int mode,
objset_t **osp)
{
dsl_dataset_t *ds;
int err;
objset_t *os;
objset_impl_t *osi;
os = kmem_alloc(sizeof (objset_t), KM_SLEEP);
err = dsl_dataset_open(name, mode, os, &ds);
if (err) {
kmem_free(os, sizeof (objset_t));
return (err);
}
osi = dsl_dataset_get_user_ptr(ds);
if (osi == NULL) {
err = dmu_objset_open_impl(dsl_dataset_get_spa(ds),
ds, &ds->ds_phys->ds_bp, &osi);
if (err) {
dsl_dataset_close(ds, mode, os);
kmem_free(os, sizeof (objset_t));
return (err);
}
}
os->os = osi;
os->os_mode = mode;
if (type != DMU_OST_ANY && type != os->os->os_phys->os_type) {
dmu_objset_close(os);
return (EINVAL);
}
*osp = os;
return (0);
}
/*
* This will close the objset.
*/
int
dmu_objset_rollback(objset_t *os)
{
int err;
dsl_dataset_t *ds;
ds = os->os->os_dsl_dataset;
if (!dsl_dataset_tryown(ds, TRUE, os)) {
dmu_objset_close(os);
return (EBUSY);
}
err = dsl_dataset_rollback(ds, os->os->os_phys->os_type);
/*
* NB: we close the objset manually because the rollback
* actually implicitly called dmu_objset_evict(), thus freeing
* the objset_impl_t.
*/
dsl_dataset_disown(ds, os);
kmem_free(os, sizeof (objset_t));
return (err);
}
/*ARGSUSED*/
static int
zfs_vfs_unmount(struct mount *mp, int mntflags, vfs_context_t context)
{
zfsvfs_t *zfsvfs = vfs_fsprivate(mp);
objset_t *os = zfsvfs->z_os;
znode_t *zp, *nextzp;
int ret, i;
int flags;
/*XXX NOEL: delegation admin stuffs, add back if we use delg. admin */
#if 0
ret = 0; /* UNDEFINED: secpolicy_fs_unmount(cr, vfsp); */
if (ret) {
ret = dsl_deleg_access((char *)refstr_value(vfsp->vfs_resource),
ZFS_DELEG_PERM_MOUNT, cr);
if (ret)
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);
#endif
/*
* Unmount any snapshots mounted under .zfs before unmounting the
* dataset itself.
*/
#if 0
if (zfsvfs->z_ctldir != NULL &&
(ret = zfsctl_umount_snapshots(vfsp, fflag, cr)) != 0) {
return (ret);
#endif
flags = SKIPSYSTEM;
if (mntflags & MNT_FORCE)
flags |= FORCECLOSE;
ret = vflush(mp, NULLVP, flags);
/*
* Mac OS X needs a file system modify time
*
* We use the mtime of the "com.apple.system.mtime"
* extended attribute, which is associated with the
* file system root directory.
*
* Here we need to release the ref we took on z_mtime_vp during mount.
*/
if ((ret == 0) || (mntflags & MNT_FORCE)) {
if (zfsvfs->z_mtime_vp != NULL) {
struct vnode *mvp;
mvp = zfsvfs->z_mtime_vp;
zfsvfs->z_mtime_vp = NULL;
if (vnode_get(mvp) == 0) {
vnode_rele(mvp);
vnode_recycle(mvp);
vnode_put(mvp);
}
}
}
if (!(mntflags & MNT_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 (ret)
return (EBUSY);
#if 0
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);
}
}
#endif
}
rw_enter(&zfsvfs->z_unmount_lock, RW_WRITER);
rw_enter(&zfsvfs->z_unmount_inactive_lock, RW_WRITER);
/*
* At this point there are no vops active, and any new vops will
* fail with EIO since we have z_unmount_lock for writer (only
* relavent for forced unmount).
*
* Release all holds on dbufs.
* Note, the dmu can still 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);
/*
* Set the unmounted flag and let new vops unblock.
* zfs_inactive will have the unmounted behavior, and all other
* vops will fail with EIO.
*/
zfsvfs->z_unmounted = B_TRUE;
rw_exit(&zfsvfs->z_unmount_lock);
rw_exit(&zfsvfs->z_unmount_inactive_lock);
/*
* Unregister properties.
*/
#ifndef __APPLE__
if (!dmu_objset_is_snapshot(os))
zfs_unregister_callbacks(zfsvfs);
#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;
}
/*
* Evict all dbufs so that cached znodes will be freed
*/
if (dmu_objset_evict_dbufs(os, B_TRUE)) {
txg_wait_synced(dmu_objset_pool(zfsvfs->z_os), 0);
(void) dmu_objset_evict_dbufs(os, B_FALSE);
}
/*
* Finally close the objset
*/
dmu_objset_close(os);
/*
* We can now safely destroy the '.zfs' directory node.
*/
#if 0
if (zfsvfs->z_ctldir != NULL)
zfsctl_destroy(zfsvfs);
#endif
/*
* Note that this work is normally done in zfs_freevfs, but since
* there is no VOP_FREEVFS in OSX, we free VFS items here
*/
OSDecrementAtomic((SInt32 *)&zfs_active_fs_count);
for (i = 0; i != ZFS_OBJ_MTX_SZ; i++)
mutex_destroy(&zfsvfs->z_hold_mtx[i]);
mutex_destroy(&zfsvfs->z_znodes_lock);
list_destroy(&zfsvfs->z_all_znodes);
rw_destroy(&zfsvfs->z_unmount_lock);
rw_destroy(&zfsvfs->z_unmount_inactive_lock);
return (0);
}
struct vnode* vnode_getparent(struct vnode *vp); /* sys/vnode_internal.h */
static int
zfs_vget_internal(zfsvfs_t *zfsvfs, ino64_t ino, struct vnode **vpp)
{
struct vnode *vp;
struct vnode *dvp = NULL;
znode_t *zp;
int error;
*vpp = NULL;
/*
* On Mac OS X we always export the root directory id as 2
* and its parent as 1
*/
if (ino == 2 || ino == 1)
ino = zfsvfs->z_root;
if ((error = zfs_zget(zfsvfs, ino, &zp)))
goto out;
/* Don't expose EA objects! */
if (zp->z_phys->zp_flags & ZFS_XATTR) {
vnode_put(ZTOV(zp));
error = ENOENT;
goto out;
}
*vpp = vp = ZTOV(zp);
if (vnode_isvroot(vp))
goto out;
/*
* If this znode didn't just come from the cache then
* it won't have a valid identity (parent and name).
*
* Manually fix its identity here (normally done by namei lookup).
*/
if ((dvp = vnode_getparent(vp)) == NULL) {
if (zp->z_phys->zp_parent != 0 &&
zfs_vget_internal(zfsvfs, zp->z_phys->zp_parent, &dvp)) {
goto out;
}
if ( vnode_isdir(dvp) ) {
char objname[ZAP_MAXNAMELEN]; /* 256 bytes */
int flags = VNODE_UPDATE_PARENT;
/* Look for znode's name in its parent's zap */
if ( zap_value_search(zfsvfs->z_os,
zp->z_phys->zp_parent,
zp->z_id,
ZFS_DIRENT_OBJ(-1ULL),
objname) == 0 ) {
flags |= VNODE_UPDATE_NAME;
}
/* Update the znode's parent and name */
vnode_update_identity(vp, dvp, objname, 0, 0, flags);
}
}
/* All done with znode's parent */
vnode_put(dvp);
out:
return (error);
}
/*
* Get a vnode from a file id (ignoring the generation)
*
* Use by NFS Server (readdirplus) and VFS (build_path)
*/
static int
zfs_vfs_vget(struct mount *mp, ino64_t ino, struct vnode **vpp, __unused vfs_context_t context)
{
zfsvfs_t *zfsvfs = vfs_fsprivate(mp);
int error;
ZFS_ENTER(zfsvfs);
/*
* On Mac OS X we always export the root directory id as 2.
* So we don't expect to see the real root directory id
* from zfs_vfs_vget KPI (unless of course the real id was
* already 2).
*/
if ((ino == zfsvfs->z_root) && (zfsvfs->z_root != 2)) {
ZFS_EXIT(zfsvfs);
return (ENOENT);
}
error = zfs_vget_internal(zfsvfs, ino, vpp);
ZFS_EXIT(zfsvfs);
return (error);
}
static int
zfs_domount(struct mount *mp, dev_t mount_dev, char *osname, vfs_context_t ctx)
{
uint64_t readonly;
int error = 0;
int mode;
zfsvfs_t *zfsvfs;
znode_t *zp = NULL;
struct timeval tv;
ASSERT(mp);
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 = mp;
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_unmount_lock, NULL, RW_DEFAULT, NULL);
rw_init(&zfsvfs->z_unmount_inactive_lock, NULL, RW_DEFAULT, NULL);
#ifndef __APPLE__
/* Initialize the generic filesystem structure. */
vfsp->vfs_bcount = 0;
vfsp->vfs_data = NULL;
if (zfs_create_unique_device(&mount_dev) == -1) {
error = ENODEV;
goto out;
}
ASSERT(vfs_devismounted(mount_dev) == 0);
#endif
vfs_setfsprivate(mp, zfsvfs);
if (error = dsl_prop_get_integer(osname, "readonly", &readonly, NULL))
goto out;
if (readonly) {
mode = DS_MODE_PRIMARY | DS_MODE_READONLY;
vfs_setflags(mp, (u_int64_t)((unsigned int)MNT_RDONLY));
} 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, (cred_t *) vfs_context_ucred(ctx)))
goto out;
/* The call to zfs_init_fs leaves the vnode held, release it here. */
vnode_put(ZTOV(zp));
if (dmu_objset_is_snapshot(zfsvfs->z_os)) {
uint64_t xattr;
ASSERT(mode & DS_MODE_READONLY);
#if 0
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);
#endif
zfsvfs->z_issnap = B_TRUE;
} else {
if (!vfs_isrdonly(mp))
zfs_unlinked_drain(zfsvfs);
#ifndef __APPLE__
/*
* 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.
*/
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);
#endif
}
#if 0
if (!zfsvfs->z_issnap)
zfsctl_create(zfsvfs);
#endif
/*
* Record the mount time (for Spotlight)
*/
microtime(&tv);
zfsvfs->z_mount_time = tv.tv_sec;
out:
if (error) {
if (zfsvfs->z_os)
dmu_objset_close(zfsvfs->z_os);
mutex_destroy(&zfsvfs->z_znodes_lock);
list_destroy(&zfsvfs->z_all_znodes);
rw_destroy(&zfsvfs->z_unmount_lock);
rw_destroy(&zfsvfs->z_unmount_inactive_lock);
kmem_free(zfsvfs, sizeof (zfsvfs_t));
} else {
OSIncrementAtomic(&zfs_active_fs_count);
(void) copystr(osname, vfs_statfs(mp)->f_mntfromname, MNAMELEN - 1, 0);
vfs_getnewfsid(mp);
}
return (error);
}
static int
zfs_domount(vfs_t *vfsp, char *osname)
{
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);
mutex_init(&zfsvfs->z_online_recv_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);
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;
vfsp->mnt_kern_flag |= MNTK_SHARED_WRITES;
if (error = dsl_prop_get_integer(osname, "readonly", &readonly, NULL))
goto out;
mode = DS_MODE_OWNER;
if (readonly)
mode |= DS_MODE_READONLY;
error = dmu_objset_open(osname, DMU_OST_ZFS, mode, &zfsvfs->z_os);
if (error == EROFS) {
mode = DS_MODE_OWNER | 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))
goto out;
/*
* Set features for file system.
*/
zfsvfs->z_use_fuids = USE_FUIDS(zfsvfs->z_version, zfsvfs->z_os);
if (zfsvfs->z_use_fuids) {
vfs_set_feature(vfsp, VFSFT_XVATTR);
vfs_set_feature(vfsp, VFSFT_SYSATTR_VIEWS);
vfs_set_feature(vfsp, VFSFT_ACEMASKONACCESS);
vfs_set_feature(vfsp, VFSFT_ACLONCREATE);
}
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);
}
if (dmu_objset_is_snapshot(zfsvfs->z_os)) {
uint64_t pval;
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", &pval, NULL))
goto out;
xattr_changed_cb(zfsvfs, pval);
zfsvfs->z_issnap = B_TRUE;
} else {
error = zfsvfs_setup(zfsvfs, B_TRUE);
}
vfs_mountedfrom(vfsp, osname);
if (!zfsvfs->z_issnap)
zfsctl_create(zfsvfs);
out:
if (error) {
if (zfsvfs->z_os)
dmu_objset_close(zfsvfs->z_os);
zfs_freezfsvfs(zfsvfs);
} else {
atomic_add_32(&zfs_active_fs_count, 1);
}
return (error);
}
/*ARGSUSED*/
static int
zfs_umount(vfs_t *vfsp, int fflag)
{
zfsvfs_t *zfsvfs = vfsp->vfs_data;
objset_t *os;
cred_t *cr = curthread->td_ucred;
int ret;
ret = secpolicy_fs_unmount(cr, vfsp);
if (ret) {
ret = dsl_deleg_access((char *)refstr_value(vfsp->vfs_resource),
ZFS_DELEG_PERM_MOUNT, cr);
if (ret)
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);
ret = vflush(vfsp, 0, 0, curthread);
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);
}
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.
*/
rrw_enter(&zfsvfs->z_teardown_lock, RW_WRITER, FTAG);
zfsvfs->z_unmounted = B_TRUE;
rrw_exit(&zfsvfs->z_teardown_lock, FTAG);
}
/*
* Flush all the files.
*/
ret = vflush(vfsp, 1, (fflag & MS_FORCE) ? FORCECLOSE : 0, curthread);
if (ret != 0) {
if (!zfsvfs->z_issnap) {
zfsctl_create(zfsvfs);
ASSERT(zfsvfs->z_ctldir != NULL);
}
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);
}
} else {
MNT_ILOCK(vfsp);
vfsp->mnt_kern_flag |= MNTK_UNMOUNTF;
MNT_IUNLOCK(vfsp);
}
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->os_user_ptr_lock);
dmu_objset_set_user(os, NULL);
mutex_exit(&os->os->os_user_ptr_lock);
/*
* Finally release the objset
*/
dmu_objset_close(os);
}
/*
* We can now safely destroy the '.zfs' directory node.
*/
if (zfsvfs->z_ctldir != NULL)
zfsctl_destroy(zfsvfs);
if (zfsvfs->z_issnap) {
vnode_t *svp = vfsp->mnt_vnodecovered;
if (svp->v_count >= 2)
VN_RELE(svp);
}
zfs_freevfs(vfsp);
return (0);
}
/* ARGSUSED */
static int
zfsctl_snapdir_lookup(vnode_t *dvp, char *nm, vnode_t **vpp, pathname_t *pnp,
int flags, vnode_t *rdir, cred_t *cr, caller_context_t *ct,
int *direntflags, pathname_t *realpnp)
{
zfsctl_snapdir_t *sdp = dvp->v_data;
objset_t *snap;
char snapname[MAXNAMELEN];
char real[MAXNAMELEN];
char *mountpoint;
zfs_snapentry_t *sep, search;
struct mounta margs;
vfs_t *vfsp;
size_t mountpoint_len;
avl_index_t where;
zfsvfs_t *zfsvfs = dvp->v_vfsp->vfs_data;
int err;
/*
* No extended attributes allowed under .zfs
*/
if (flags & LOOKUP_XATTR)
return (EINVAL);
ASSERT(dvp->v_type == VDIR);
/*
* If we get a recursive call, that means we got called
* from the domount() code while it was trying to look up the
* spec (which looks like a local path for zfs). We need to
* add some flag to domount() to tell it not to do this lookup.
*/
if (MUTEX_HELD(&sdp->sd_lock))
return (ENOENT);
ZFS_ENTER(zfsvfs);
if (gfs_lookup_dot(vpp, dvp, zfsvfs->z_ctldir, nm) == 0) {
ZFS_EXIT(zfsvfs);
return (0);
}
if (flags & FIGNORECASE) {
boolean_t conflict = B_FALSE;
err = dmu_snapshot_realname(zfsvfs->z_os, nm, real,
MAXNAMELEN, &conflict);
if (err == 0) {
nm = real;
} else if (err != ENOTSUP) {
ZFS_EXIT(zfsvfs);
return (err);
}
if (realpnp)
(void) strlcpy(realpnp->pn_buf, nm,
realpnp->pn_bufsize);
if (conflict && direntflags)
*direntflags = ED_CASE_CONFLICT;
}
mutex_enter(&sdp->sd_lock);
search.se_name = (char *)nm;
if ((sep = avl_find(&sdp->sd_snaps, &search, &where)) != NULL) {
*vpp = sep->se_root;
VN_HOLD(*vpp);
err = traverse(vpp);
if (err) {
VN_RELE(*vpp);
*vpp = NULL;
} else if (*vpp == sep->se_root) {
/*
* The snapshot was unmounted behind our backs,
* try to remount it.
*/
goto domount;
} else {
/*
* VROOT was set during the traverse call. We need
* to clear it since we're pretending to be part
* of our parent's vfs.
*/
(*vpp)->v_flag &= ~VROOT;
}
mutex_exit(&sdp->sd_lock);
ZFS_EXIT(zfsvfs);
return (err);
}
/*
* The requested snapshot is not currently mounted, look it up.
*/
err = zfsctl_snapshot_zname(dvp, nm, MAXNAMELEN, snapname);
if (err) {
mutex_exit(&sdp->sd_lock);
ZFS_EXIT(zfsvfs);
/*
* handle "ls *" or "?" in a graceful manner,
* forcing EILSEQ to ENOENT.
* Since shell ultimately passes "*" or "?" as name to lookup
*/
return (err == EILSEQ ? ENOENT : err);
}
if (dmu_objset_open(snapname, DMU_OST_ZFS,
DS_MODE_USER | DS_MODE_READONLY, &snap) != 0) {
mutex_exit(&sdp->sd_lock);
ZFS_EXIT(zfsvfs);
return (ENOENT);
}
sep = kmem_alloc(sizeof (zfs_snapentry_t), KM_SLEEP);
sep->se_name = kmem_alloc(strlen(nm) + 1, KM_SLEEP);
(void) strcpy(sep->se_name, nm);
*vpp = sep->se_root = zfsctl_snapshot_mknode(dvp, dmu_objset_id(snap));
avl_insert(&sdp->sd_snaps, sep, where);
dmu_objset_close(snap);
domount:
mountpoint_len = strlen(refstr_value(dvp->v_vfsp->vfs_mntpt)) +
strlen("/.zfs/snapshot/") + strlen(nm) + 1;
mountpoint = kmem_alloc(mountpoint_len, KM_SLEEP);
(void) snprintf(mountpoint, mountpoint_len, "%s/.zfs/snapshot/%s",
refstr_value(dvp->v_vfsp->vfs_mntpt), nm);
margs.spec = snapname;
margs.dir = mountpoint;
margs.flags = MS_SYSSPACE | MS_NOMNTTAB;
margs.fstype = "zfs";
margs.dataptr = NULL;
margs.datalen = 0;
margs.optptr = NULL;
margs.optlen = 0;
err = domount("zfs", &margs, *vpp, kcred, &vfsp);
kmem_free(mountpoint, mountpoint_len);
if (err == 0) {
/*
* Return the mounted root rather than the covered mount point.
* Takes the GFS vnode at .zfs/snapshot/<snapname> and returns
* the ZFS vnode mounted on top of the GFS node. This ZFS
* vnode is the root of the newly created vfsp.
*/
VFS_RELE(vfsp);
err = traverse(vpp);
}
if (err == 0) {
/*
* Fix up the root vnode mounted on .zfs/snapshot/<snapname>.
*
* This is where we lie about our v_vfsp in order to
* make .zfs/snapshot/<snapname> accessible over NFS
* without requiring manual mounts of <snapname>.
*/
ASSERT(VTOZ(*vpp)->z_zfsvfs != zfsvfs);
VTOZ(*vpp)->z_zfsvfs->z_parent = zfsvfs;
(*vpp)->v_vfsp = zfsvfs->z_vfs;
(*vpp)->v_flag &= ~VROOT;
}
mutex_exit(&sdp->sd_lock);
ZFS_EXIT(zfsvfs);
/*
* If we had an error, drop our hold on the vnode and
* zfsctl_snapshot_inactive() will clean up.
*/
if (err) {
VN_RELE(*vpp);
*vpp = NULL;
}
return (err);
}
static int
zfs_domount(vfs_t *vfsp, char *osname, cred_t *cr)
{
dev_t mount_dev;
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);
/* Initialize the generic filesystem structure. */
vfsp->vfs_bcount = 0;
vfsp->vfs_data = NULL;
if (zfs_create_unique_device(&mount_dev) == -1) {
error = ENODEV;
goto out;
}
ASSERT(vfs_devismounted(mount_dev) == 0);
if (error = dsl_prop_get_integer(osname, "recordsize", &recordsize,
NULL))
goto out;
vfsp->vfs_dev = mount_dev;
vfsp->vfs_fstype = zfsfstype;
vfsp->vfs_bsize = recordsize;
vfsp->vfs_flag |= VFS_NOTRUNC;
vfsp->vfs_data = zfsvfs;
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;
/* The call to zfs_init_fs leaves the vnode held, release it here. */
VN_RELE(ZTOV(zp));
if (dmu_objset_is_snapshot(zfsvfs->z_os)) {
ASSERT(mode & DS_MODE_READONLY);
atime_changed_cb(zfsvfs, B_FALSE);
readonly_changed_cb(zfsvfs, B_TRUE);
zfsvfs->z_issnap = B_TRUE;
} else {
error = zfs_register_callbacks(vfsp);
if (error)
goto out;
/*
* Start a delete thread running.
*/
(void) zfs_delete_thread_target(zfsvfs, 1);
/*
* Parse and replay the intent log.
*/
zil_replay(zfsvfs->z_os, zfsvfs, &zfsvfs->z_assign,
zfs_replay_vector, (void (*)(void *))zfs_delete_wait_empty);
if (!zil_disable)
zfsvfs->z_log = zil_open(zfsvfs->z_os, zfs_get_data);
}
if (!zfsvfs->z_issnap)
zfsctl_create(zfsvfs);
out:
if (error) {
if (zfsvfs->z_os)
dmu_objset_close(zfsvfs->z_os);
kmem_free(zfsvfs, sizeof (zfsvfs_t));
} else {
atomic_add_32(&zfs_active_fs_count, 1);
}
return (error);
}
static void
zfs_objset_close(zfsvfs_t *zfsvfs)
{
zfs_delete_t *zd = &zfsvfs->z_delete_head;
znode_t *zp, *nextzp;
objset_t *os = zfsvfs->z_os;
/*
* Stop all delete threads.
*/
(void) zfs_delete_thread_target(zfsvfs, 0);
/*
* 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 delete in progress znodes
* They will be processed when the file system remounts.
*/
mutex_enter(&zd->z_mutex);
while (zp = list_head(&zd->z_znodes)) {
list_remove(&zd->z_znodes, zp);
zp->z_dbuf_held = 0;
dmu_buf_rele(zp->z_dbuf, NULL);
}
mutex_exit(&zd->z_mutex);
/*
* 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);
/*
* We can now safely destroy the '.zfs' directory node.
*/
if (zfsvfs->z_ctldir != NULL)
zfsctl_destroy(zfsvfs);
}
/*
* Create a minor node for the specified volume.
*/
int
zvol_create_minor(zfs_cmd_t *zc)
{
char *name = zc->zc_name;
dev_t dev = zc->zc_dev;
zvol_state_t *zv;
objset_t *os;
uint64_t volsize;
minor_t minor = 0;
struct pathname linkpath;
int ds_mode = DS_MODE_PRIMARY;
vnode_t *vp = NULL;
char *devpath;
size_t devpathlen = strlen(ZVOL_FULL_DEV_DIR) + 1 + strlen(name) + 1;
char chrbuf[30], blkbuf[30];
int error;
mutex_enter(&zvol_state_lock);
if ((zv = zvol_minor_lookup(name)) != NULL) {
mutex_exit(&zvol_state_lock);
return (EEXIST);
}
if (strchr(name, '@') != 0)
ds_mode |= DS_MODE_READONLY;
error = dmu_objset_open(name, DMU_OST_ZVOL, ds_mode, &os);
if (error) {
mutex_exit(&zvol_state_lock);
return (error);
}
error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize);
if (error) {
dmu_objset_close(os);
mutex_exit(&zvol_state_lock);
return (error);
}
/*
* If there's an existing /dev/zvol symlink, try to use the
* same minor number we used last time.
*/
devpath = kmem_alloc(devpathlen, KM_SLEEP);
(void) sprintf(devpath, "%s/%s", ZVOL_FULL_DEV_DIR, name);
error = lookupname(devpath, UIO_SYSSPACE, NO_FOLLOW, NULL, &vp);
kmem_free(devpath, devpathlen);
if (error == 0 && vp->v_type != VLNK)
error = EINVAL;
if (error == 0) {
pn_alloc(&linkpath);
error = pn_getsymlink(vp, &linkpath, kcred);
if (error == 0) {
char *ms = strstr(linkpath.pn_path, ZVOL_PSEUDO_DEV);
if (ms != NULL) {
ms += strlen(ZVOL_PSEUDO_DEV);
minor = stoi(&ms);
}
}
pn_free(&linkpath);
}
if (vp != NULL)
VN_RELE(vp);
/*
* If we found a minor but it's already in use, we must pick a new one.
*/
if (minor != 0 && ddi_get_soft_state(zvol_state, minor) != NULL)
minor = 0;
if (minor == 0)
minor = zvol_minor_alloc();
if (minor == 0) {
dmu_objset_close(os);
mutex_exit(&zvol_state_lock);
return (ENXIO);
}
if (ddi_soft_state_zalloc(zvol_state, minor) != DDI_SUCCESS) {
dmu_objset_close(os);
mutex_exit(&zvol_state_lock);
return (EAGAIN);
}
(void) ddi_prop_update_string(minor, zfs_dip, ZVOL_PROP_NAME, name);
(void) sprintf(chrbuf, "%uc,raw", minor);
if (ddi_create_minor_node(zfs_dip, chrbuf, S_IFCHR,
minor, DDI_PSEUDO, 0) == DDI_FAILURE) {
ddi_soft_state_free(zvol_state, minor);
dmu_objset_close(os);
mutex_exit(&zvol_state_lock);
return (EAGAIN);
}
(void) sprintf(blkbuf, "%uc", minor);
if (ddi_create_minor_node(zfs_dip, blkbuf, S_IFBLK,
minor, DDI_PSEUDO, 0) == DDI_FAILURE) {
ddi_remove_minor_node(zfs_dip, chrbuf);
ddi_soft_state_free(zvol_state, minor);
dmu_objset_close(os);
mutex_exit(&zvol_state_lock);
return (EAGAIN);
}
zv = ddi_get_soft_state(zvol_state, minor);
(void) strcpy(zv->zv_name, name);
zv->zv_min_bs = DEV_BSHIFT;
zv->zv_minor = minor;
zv->zv_volsize = volsize;
zv->zv_objset = os;
zv->zv_mode = ds_mode;
zv->zv_zilog = zil_open(os, NULL);
rw_init(&zv->zv_dslock, NULL, RW_DEFAULT, NULL);
zil_replay(os, zv, &zv->zv_txg_assign, zvol_replay_vector, NULL);
zvol_size_changed(zv, dev);
/* XXX this should handle the possible i/o error */
VERIFY(dsl_prop_register(dmu_objset_ds(zv->zv_objset),
"readonly", zvol_readonly_changed_cb, zv) == 0);
zvol_minors++;
mutex_exit(&zvol_state_lock);
return (0);
}
