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Fix zsb->z_hold_mtx deadlock 

The zfs_znode_hold_enter() / zfs_znode_hold_exit() functions are used to
serialize access to a znode and its SA buffer while the object is being
created or destroyed.  This kind of locking would normally reside in the
znode itself but in this case that's impossible because the znode and SA
buffer may not yet exist.  Therefore the locking is handled externally
with an array of mutexs and AVLs trees which contain per-object locks.

In zfs_znode_hold_enter() a per-object lock is created as needed, inserted
in to the correct AVL tree and finally the per-object lock is held.  In
zfs_znode_hold_exit() the process is reversed.  The per-object lock is
released, removed from the AVL tree and destroyed if there are no waiters.

This scheme has two important properties:

1) No memory allocations are performed while holding one of the z_hold_locks.
   This ensures evict(), which can be called from direct memory reclaim, will
   never block waiting on a z_hold_locks which just happens to have hashed
   to the same index.

2) All locks used to serialize access to an object are per-object and never
   shared.  This minimizes lock contention without creating a large number
   of dedicated locks.

On the downside it does require znode_lock_t structures to be frequently
allocated and freed.  However, because these are backed by a kmem cache
and very short lived this cost is minimal.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #4106
This commit is contained in:
Brian Behlendorf 2015-12-22 13:47:38 -08:00
parent 0720116d4d
commit c96c36fa22
4 changed files with 218 additions and 64 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
include/sys/zfs_vfsops.h
View File

@ -112,8 +112,9 @@ typedef struct zfs_sb {
uint64_t z_groupquota_obj;
uint64_t z_replay_eof; /* New end of file - replay only */
sa_attr_type_t *z_attr_table; /* SA attr mapping->id */
uint64_t z_hold_mtx_size; /* znode hold locks size */
kmutex_t *z_hold_mtx; /* znode hold locks */
uint64_t z_hold_size; /* znode hold array size */
avl_tree_t *z_hold_trees; /* znode hold trees */
kmutex_t *z_hold_locks; /* znode hold locks */
} zfs_sb_t;
#define ZFS_SUPER_MAGIC 0x2fc12fc1

21
include/sys/zfs_znode.h
View File

@ -220,6 +220,12 @@ typedef struct znode {
struct inode z_inode; /* generic vfs inode */
} znode_t;
typedef struct znode_hold {
uint64_t zh_obj; /* object id */
kmutex_t zh_lock; /* lock serializing object access */
avl_node_t zh_node; /* avl tree linkage */
refcount_t zh_refcount; /* active consumer reference count */
} znode_hold_t;
/*
* Range locking rules
@ -275,22 +281,10 @@ typedef struct znode {
*/
#define ZFS_OBJ_MTX_SZ 64
#define ZFS_OBJ_MTX_MAX (1024 * 1024)
#define ZFS_OBJ_HASH(zsb, obj) ((obj) & ((zsb->z_hold_size) - 1))
extern unsigned int zfs_object_mutex_size;
#define ZFS_OBJ_HASH(zsb, obj_num) \
((obj_num) & ((zsb->z_hold_mtx_size) - 1))
#define ZFS_OBJ_MUTEX(zsb, obj_num) \
(&(zsb)->z_hold_mtx[ZFS_OBJ_HASH(zsb, obj_num)])
#define ZFS_OBJ_HOLD_ENTER(zsb, obj_num) \
mutex_enter(ZFS_OBJ_MUTEX((zsb), (obj_num)))
#define ZFS_OBJ_HOLD_TRYENTER(zsb, obj_num) \
mutex_tryenter(ZFS_OBJ_MUTEX((zsb), (obj_num)))
#define ZFS_OBJ_HOLD_EXIT(zsb, obj_num) \
mutex_exit(ZFS_OBJ_MUTEX((zsb), (obj_num)))
#define ZFS_OBJ_HOLD_OWNED(zsb, obj_num) \
mutex_owned(ZFS_OBJ_MUTEX((zsb), (obj_num)))
/* Encode ZFS stored time values from a struct timespec */
#define ZFS_TIME_ENCODE(tp, stmp) \
{ \
@ -326,6 +320,7 @@ extern void zfs_grow_blocksize(znode_t *, uint64_t, dmu_tx_t *);
extern int zfs_freesp(znode_t *, uint64_t, uint64_t, int, boolean_t);
extern void zfs_znode_init(void);
extern void zfs_znode_fini(void);
extern int zfs_znode_hold_compare(const void *, const void *);
extern int zfs_zget(zfs_sb_t *, uint64_t, znode_t **);
extern int zfs_rezget(znode_t *);
extern void zfs_zinactive(znode_t *);

32
module/zfs/zfs_vfsops.c
View File

@ -663,7 +663,7 @@ zfs_sb_create(const char *osname, zfs_mntopts_t *zmo, zfs_sb_t **zsbp)
objset_t *os;
zfs_sb_t *zsb;
uint64_t zval;
int i, error;
int i, size, error;
uint64_t sa_obj;
zsb = kmem_zalloc(sizeof (zfs_sb_t), KM_SLEEP);
@ -685,8 +685,7 @@ zfs_sb_create(const char *osname, zfs_mntopts_t *zmo, zfs_sb_t **zsbp)
/*
* Initialize the zfs-specific filesystem structure.
* Should probably make this a kmem cache, shuffle fields,
* and just bzero up to z_hold_mtx[].
* Should probably make this a kmem cache, shuffle fields.
*/
zsb->z_sb = NULL;
zsb->z_parent = zsb;
@ -795,12 +794,15 @@ zfs_sb_create(const char *osname, zfs_mntopts_t *zmo, zfs_sb_t **zsbp)
rw_init(&zsb->z_teardown_inactive_lock, NULL, RW_DEFAULT, NULL);
rw_init(&zsb->z_fuid_lock, NULL, RW_DEFAULT, NULL);
zsb->z_hold_mtx_size = MIN(1 << (highbit64(zfs_object_mutex_size) - 1),
ZFS_OBJ_MTX_MAX);
zsb->z_hold_mtx = vmem_zalloc(sizeof (kmutex_t) * zsb->z_hold_mtx_size,
KM_SLEEP);
for (i = 0; i != zsb->z_hold_mtx_size; i++)
mutex_init(&zsb->z_hold_mtx[i], NULL, MUTEX_DEFAULT, NULL);
size = MIN(1 << (highbit64(zfs_object_mutex_size)-1), ZFS_OBJ_MTX_MAX);
zsb->z_hold_size = size;
zsb->z_hold_trees = vmem_zalloc(sizeof (avl_tree_t) * size, KM_SLEEP);
zsb->z_hold_locks = vmem_zalloc(sizeof (kmutex_t) * size, KM_SLEEP);
for (i = 0; i != size; i++) {
avl_create(&zsb->z_hold_trees[i], zfs_znode_hold_compare,
sizeof (znode_hold_t), offsetof(znode_hold_t, zh_node));
mutex_init(&zsb->z_hold_locks[i], NULL, MUTEX_DEFAULT, NULL);
}
*zsbp = zsb;
return (0);
@ -809,7 +811,6 @@ out:
dmu_objset_disown(os, zsb);
*zsbp = NULL;
vmem_free(zsb->z_hold_mtx, sizeof (kmutex_t) * zsb->z_hold_mtx_size);
kmem_free(zsb, sizeof (zfs_sb_t));
return (error);
}
@ -901,7 +902,7 @@ EXPORT_SYMBOL(zfs_sb_setup);
void
zfs_sb_free(zfs_sb_t *zsb)
{
int i;
int i, size = zsb->z_hold_size;
zfs_fuid_destroy(zsb);
@ -911,9 +912,12 @@ zfs_sb_free(zfs_sb_t *zsb)
rrm_destroy(&zsb->z_teardown_lock);
rw_destroy(&zsb->z_teardown_inactive_lock);
rw_destroy(&zsb->z_fuid_lock);
for (i = 0; i != zsb->z_hold_mtx_size; i++)
mutex_destroy(&zsb->z_hold_mtx[i]);
vmem_free(zsb->z_hold_mtx, sizeof (kmutex_t) * zsb->z_hold_mtx_size);
for (i = 0; i != size; i++) {
avl_destroy(&zsb->z_hold_trees[i]);
mutex_destroy(&zsb->z_hold_locks[i]);
}
vmem_free(zsb->z_hold_trees, sizeof (avl_tree_t) * size);
vmem_free(zsb->z_hold_locks, sizeof (kmutex_t) * size);
zfs_mntopts_free(zsb->z_mntopts);
kmem_free(zsb, sizeof (zfs_sb_t));
}

220
module/zfs/zfs_znode.c
View File

@ -95,6 +95,7 @@
#ifdef _KERNEL
static kmem_cache_t *znode_cache = NULL;
static kmem_cache_t *znode_hold_cache = NULL;
unsigned int zfs_object_mutex_size = ZFS_OBJ_MTX_SZ;
/*ARGSUSED*/
@ -145,6 +146,27 @@ zfs_znode_cache_destructor(void *buf, void *arg)
ASSERT(zp->z_xattr_parent == NULL);
}
static int
zfs_znode_hold_cache_constructor(void *buf, void *arg, int kmflags)
{
znode_hold_t *zh = buf;
mutex_init(&zh->zh_lock, NULL, MUTEX_DEFAULT, NULL);
refcount_create(&zh->zh_refcount);
zh->zh_obj = ZFS_NO_OBJECT;
return (0);
}
static void
zfs_znode_hold_cache_destructor(void *buf, void *arg)
{
znode_hold_t *zh = buf;
mutex_destroy(&zh->zh_lock);
refcount_destroy(&zh->zh_refcount);
}
void
zfs_znode_init(void)
{
@ -157,6 +179,11 @@ zfs_znode_init(void)
znode_cache = kmem_cache_create("zfs_znode_cache",
sizeof (znode_t), 0, zfs_znode_cache_constructor,
zfs_znode_cache_destructor, NULL, NULL, NULL, KMC_SLAB);
ASSERT(znode_hold_cache == NULL);
znode_hold_cache = kmem_cache_create("zfs_znode_hold_cache",
sizeof (znode_hold_t), 0, zfs_znode_hold_cache_constructor,
zfs_znode_hold_cache_destructor, NULL, NULL, NULL, 0);
}
void
@ -168,6 +195,124 @@ zfs_znode_fini(void)
if (znode_cache)
kmem_cache_destroy(znode_cache);
znode_cache = NULL;
if (znode_hold_cache)
kmem_cache_destroy(znode_hold_cache);
znode_hold_cache = NULL;
}
/*
* The zfs_znode_hold_enter() / zfs_znode_hold_exit() functions are used to
* serialize access to a znode and its SA buffer while the object is being
* created or destroyed. This kind of locking would normally reside in the
* znode itself but in this case that's impossible because the znode and SA
* buffer may not yet exist. Therefore the locking is handled externally
* with an array of mutexs and AVLs trees which contain per-object locks.
*
* In zfs_znode_hold_enter() a per-object lock is created as needed, inserted
* in to the correct AVL tree and finally the per-object lock is held. In
* zfs_znode_hold_exit() the process is reversed. The per-object lock is
* released, removed from the AVL tree and destroyed if there are no waiters.
*
* This scheme has two important properties:
*
* 1) No memory allocations are performed while holding one of the z_hold_locks.
* This ensures evict(), which can be called from direct memory reclaim, will
* never block waiting on a z_hold_locks which just happens to have hashed
* to the same index.
*
* 2) All locks used to serialize access to an object are per-object and never
* shared. This minimizes lock contention without creating a large number
* of dedicated locks.
*
* On the downside it does require znode_lock_t structures to be frequently
* allocated and freed. However, because these are backed by a kmem cache
* and very short lived this cost is minimal.
*/
int
zfs_znode_hold_compare(const void *a, const void *b)
{
const znode_hold_t *zh_a = a;
const znode_hold_t *zh_b = b;
if (zh_a->zh_obj < zh_b->zh_obj)
return (-1);
else if (zh_a->zh_obj > zh_b->zh_obj)
return (1);
else
return (0);
}
boolean_t
zfs_znode_held(zfs_sb_t *zsb, uint64_t obj)
{
znode_hold_t *zh, search;
int i = ZFS_OBJ_HASH(zsb, obj);
search.zh_obj = obj;
mutex_enter(&zsb->z_hold_locks[i]);
zh = avl_find(&zsb->z_hold_trees[i], &search, NULL);
mutex_exit(&zsb->z_hold_locks[i]);
if (zh && MUTEX_HELD(&zh->zh_lock))
return (B_TRUE);
return (B_FALSE);
}
static znode_hold_t *
zfs_znode_hold_enter(zfs_sb_t *zsb, uint64_t obj)
{
znode_hold_t *zh, *zh_new, search;
int i = ZFS_OBJ_HASH(zsb, obj);
boolean_t found = B_FALSE;
zh_new = kmem_cache_alloc(znode_hold_cache, KM_SLEEP);
zh_new->zh_obj = obj;
search.zh_obj = obj;
mutex_enter(&zsb->z_hold_locks[i]);
zh = avl_find(&zsb->z_hold_trees[i], &search, NULL);
if (likely(zh == NULL)) {
zh = zh_new;
avl_add(&zsb->z_hold_trees[i], zh);
} else {
ASSERT3U(zh->zh_obj, ==, obj);
found = B_TRUE;
}
refcount_add(&zh->zh_refcount, NULL);
mutex_exit(&zsb->z_hold_locks[i]);
if (found == B_TRUE)
kmem_cache_free(znode_hold_cache, zh_new);
ASSERT(MUTEX_NOT_HELD(&zh->zh_lock));
ASSERT3S(refcount_count(&zh->zh_refcount), >, 0);
mutex_enter(&zh->zh_lock);
return (zh);
}
static void
zfs_znode_hold_exit(zfs_sb_t *zsb, znode_hold_t *zh)
{
int i = ZFS_OBJ_HASH(zsb, zh->zh_obj);
boolean_t remove = B_FALSE;
ASSERT(zfs_znode_held(zsb, zh->zh_obj));
ASSERT3S(refcount_count(&zh->zh_refcount), >, 0);
mutex_exit(&zh->zh_lock);
mutex_enter(&zsb->z_hold_locks[i]);
if (refcount_remove(&zh->zh_refcount, NULL) == 0) {
avl_remove(&zsb->z_hold_trees[i], zh);
remove = B_TRUE;
}
mutex_exit(&zsb->z_hold_locks[i]);
if (remove == B_TRUE)
kmem_cache_free(znode_hold_cache, zh);
}
int
@ -222,7 +367,7 @@ static void
zfs_znode_sa_init(zfs_sb_t *zsb, znode_t *zp,
dmu_buf_t *db, dmu_object_type_t obj_type, sa_handle_t *sa_hdl)
{
ASSERT(MUTEX_HELD(ZFS_OBJ_MUTEX(zsb, zp->z_id)));
ASSERT(zfs_znode_held(zsb, zp->z_id));
mutex_enter(&zp->z_lock);
@ -244,8 +389,7 @@ zfs_znode_sa_init(zfs_sb_t *zsb, znode_t *zp,
void
zfs_znode_dmu_fini(znode_t *zp)
{
ASSERT(MUTEX_HELD(ZFS_OBJ_MUTEX(ZTOZSB(zp), zp->z_id)) ||
zp->z_unlinked ||
ASSERT(zfs_znode_held(ZTOZSB(zp), zp->z_id) || zp->z_unlinked ||
RW_WRITE_HELD(&ZTOZSB(zp)->z_teardown_inactive_lock));
sa_handle_destroy(zp->z_sa_hdl);
@ -573,6 +717,7 @@ zfs_mknode(znode_t *dzp, vattr_t *vap, dmu_tx_t *tx, cred_t *cr,
sa_bulk_attr_t *sa_attrs;
int cnt = 0;
zfs_acl_locator_cb_t locate = { 0 };
znode_hold_t *zh;
if (zsb->z_replay) {
obj = vap->va_nodeid;
@ -619,7 +764,7 @@ zfs_mknode(znode_t *dzp, vattr_t *vap, dmu_tx_t *tx, cred_t *cr,
}
}
ZFS_OBJ_HOLD_ENTER(zsb, obj);
zh = zfs_znode_hold_enter(zsb, obj);
VERIFY(0 == sa_buf_hold(zsb->z_os, obj, NULL, &db));
/*
@ -793,7 +938,7 @@ zfs_mknode(znode_t *dzp, vattr_t *vap, dmu_tx_t *tx, cred_t *cr,
VERIFY0(zfs_aclset_common(*zpp, acl_ids->z_aclp, cr, tx));
}
kmem_free(sa_attrs, sizeof (sa_bulk_attr_t) * ZPL_END);
ZFS_OBJ_HOLD_EXIT(zsb, obj);
zfs_znode_hold_exit(zsb, zh);
}
/*
@ -897,17 +1042,18 @@ zfs_zget(zfs_sb_t *zsb, uint64_t obj_num, znode_t **zpp)
dmu_object_info_t doi;
dmu_buf_t *db;
znode_t *zp;
znode_hold_t *zh;
int err;
sa_handle_t *hdl;
*zpp = NULL;
again:
ZFS_OBJ_HOLD_ENTER(zsb, obj_num);
zh = zfs_znode_hold_enter(zsb, obj_num);
err = sa_buf_hold(zsb->z_os, obj_num, NULL, &db);
if (err) {
ZFS_OBJ_HOLD_EXIT(zsb, obj_num);
zfs_znode_hold_exit(zsb, zh);
return (err);
}
@ -917,7 +1063,7 @@ again:
(doi.doi_bonus_type == DMU_OT_ZNODE &&
doi.doi_bonus_size < sizeof (znode_phys_t)))) {
sa_buf_rele(db, NULL);
ZFS_OBJ_HOLD_EXIT(zsb, obj_num);
zfs_znode_hold_exit(zsb, zh);
return (SET_ERROR(EINVAL));
}
@ -956,7 +1102,7 @@ again:
if (igrab(ZTOI(zp)) == NULL) {
mutex_exit(&zp->z_lock);
sa_buf_rele(db, NULL);
ZFS_OBJ_HOLD_EXIT(zsb, obj_num);
zfs_znode_hold_exit(zsb, zh);
/* inode might need this to finish evict */
cond_resched();
goto again;
@ -966,7 +1112,7 @@ again:
}
mutex_exit(&zp->z_lock);
sa_buf_rele(db, NULL);
ZFS_OBJ_HOLD_EXIT(zsb, obj_num);
zfs_znode_hold_exit(zsb, zh);
return (err);
}
@ -987,7 +1133,7 @@ again:
} else {
*zpp = zp;
}
ZFS_OBJ_HOLD_EXIT(zsb, obj_num);
zfs_znode_hold_exit(zsb, zh);
return (err);
}
@ -1003,8 +1149,9 @@ zfs_rezget(znode_t *zp)
int err;
int count = 0;
uint64_t gen;
znode_hold_t *zh;
ZFS_OBJ_HOLD_ENTER(zsb, obj_num);
zh = zfs_znode_hold_enter(zsb, obj_num);
mutex_enter(&zp->z_acl_lock);
if (zp->z_acl_cached) {
@ -1028,7 +1175,7 @@ zfs_rezget(znode_t *zp)
ASSERT(zp->z_sa_hdl == NULL);
err = sa_buf_hold(zsb->z_os, obj_num, NULL, &db);
if (err) {
ZFS_OBJ_HOLD_EXIT(zsb, obj_num);
zfs_znode_hold_exit(zsb, zh);
return (err);
}
@ -1038,7 +1185,7 @@ zfs_rezget(znode_t *zp)
(doi.doi_bonus_type == DMU_OT_ZNODE &&
doi.doi_bonus_size < sizeof (znode_phys_t)))) {
sa_buf_rele(db, NULL);
ZFS_OBJ_HOLD_EXIT(zsb, obj_num);
zfs_znode_hold_exit(zsb, zh);
return (SET_ERROR(EINVAL));
}
@ -1064,7 +1211,7 @@ zfs_rezget(znode_t *zp)
if (sa_bulk_lookup(zp->z_sa_hdl, bulk, count)) {
zfs_znode_dmu_fini(zp);
ZFS_OBJ_HOLD_EXIT(zsb, obj_num);
zfs_znode_hold_exit(zsb, zh);
return (SET_ERROR(EIO));
}
@ -1072,7 +1219,7 @@ zfs_rezget(znode_t *zp)
if (gen != zp->z_gen) {
zfs_znode_dmu_fini(zp);
ZFS_OBJ_HOLD_EXIT(zsb, obj_num);
zfs_znode_hold_exit(zsb, zh);
return (SET_ERROR(EIO));
}
@ -1080,7 +1227,7 @@ zfs_rezget(znode_t *zp)
zp->z_blksz = doi.doi_data_block_size;
zfs_inode_update(zp);
ZFS_OBJ_HOLD_EXIT(zsb, obj_num);
zfs_znode_hold_exit(zsb, zh);
return (0);
}
@ -1092,15 +1239,16 @@ zfs_znode_delete(znode_t *zp, dmu_tx_t *tx)
objset_t *os = zsb->z_os;
uint64_t obj = zp->z_id;
uint64_t acl_obj = zfs_external_acl(zp);
znode_hold_t *zh;
ZFS_OBJ_HOLD_ENTER(zsb, obj);
zh = zfs_znode_hold_enter(zsb, obj);
if (acl_obj) {
VERIFY(!zp->z_is_sa);
VERIFY(0 == dmu_object_free(os, acl_obj, tx));
}
VERIFY(0 == dmu_object_free(os, obj, tx));
zfs_znode_dmu_fini(zp);
ZFS_OBJ_HOLD_EXIT(zsb, obj);
zfs_znode_hold_exit(zsb, zh);
}
void
@ -1108,13 +1256,14 @@ zfs_zinactive(znode_t *zp)
{
zfs_sb_t *zsb = ZTOZSB(zp);
uint64_t z_id = zp->z_id;
znode_hold_t *zh;
ASSERT(zp->z_sa_hdl);
/*
* Don't allow a zfs_zget() while were trying to release this znode.
*/
ZFS_OBJ_HOLD_ENTER(zsb, z_id);
zh = zfs_znode_hold_enter(zsb, z_id);
mutex_enter(&zp->z_lock);
@ -1124,9 +1273,7 @@ zfs_zinactive(znode_t *zp)
*/
if (zp->z_unlinked) {
mutex_exit(&zp->z_lock);
ZFS_OBJ_HOLD_EXIT(zsb, z_id);
zfs_znode_hold_exit(zsb, zh);
zfs_rmnode(zp);
return;
}
@ -1134,7 +1281,7 @@ zfs_zinactive(znode_t *zp)
mutex_exit(&zp->z_lock);
zfs_znode_dmu_fini(zp);
ZFS_OBJ_HOLD_EXIT(zsb, z_id);
zfs_znode_hold_exit(zsb, zh);
}
static inline int
@ -1624,6 +1771,7 @@ zfs_create_fs(objset_t *os, cred_t *cr, nvlist_t *zplprops, dmu_tx_t *tx)
uint64_t sense = ZFS_CASE_SENSITIVE;
uint64_t norm = 0;
nvpair_t *elem;
int size;
int error;
int i;
znode_t *rootzp = NULL;
@ -1735,12 +1883,15 @@ zfs_create_fs(objset_t *os, cred_t *cr, nvlist_t *zplprops, dmu_tx_t *tx)
list_create(&zsb->z_all_znodes, sizeof (znode_t),
offsetof(znode_t, z_link_node));
zsb->z_hold_mtx_size = MIN(1 << (highbit64(zfs_object_mutex_size) - 1),
ZFS_OBJ_MTX_MAX);
zsb->z_hold_mtx = vmem_zalloc(sizeof (kmutex_t) * zsb->z_hold_mtx_size,
KM_SLEEP);
for (i = 0; i != zsb->z_hold_mtx_size; i++)
mutex_init(&zsb->z_hold_mtx[i], NULL, MUTEX_DEFAULT, NULL);
size = MIN(1 << (highbit64(zfs_object_mutex_size)-1), ZFS_OBJ_MTX_MAX);
zsb->z_hold_size = size;
zsb->z_hold_trees = vmem_zalloc(sizeof (avl_tree_t) * size, KM_SLEEP);
zsb->z_hold_locks = vmem_zalloc(sizeof (kmutex_t) * size, KM_SLEEP);
for (i = 0; i != size; i++) {
avl_create(&zsb->z_hold_trees[i], zfs_znode_hold_compare,
sizeof (znode_hold_t), offsetof(znode_hold_t, zh_node));
mutex_init(&zsb->z_hold_locks[i], NULL, MUTEX_DEFAULT, NULL);
}
VERIFY(0 == zfs_acl_ids_create(rootzp, IS_ROOT_NODE, &vattr,
cr, NULL, &acl_ids));
@ -1760,10 +1911,13 @@ zfs_create_fs(objset_t *os, cred_t *cr, nvlist_t *zplprops, dmu_tx_t *tx)
error = zfs_create_share_dir(zsb, tx);
ASSERT(error == 0);
for (i = 0; i != zsb->z_hold_mtx_size; i++)
mutex_destroy(&zsb->z_hold_mtx[i]);
for (i = 0; i != size; i++) {
avl_destroy(&zsb->z_hold_trees[i]);
mutex_destroy(&zsb->z_hold_locks[i]);
}
vmem_free(zsb->z_hold_mtx, sizeof (kmutex_t) * zsb->z_hold_mtx_size);
vmem_free(zsb->z_hold_trees, sizeof (avl_tree_t) * size);
vmem_free(zsb->z_hold_locks, sizeof (kmutex_t) * size);
kmem_free(sb, sizeof (struct super_block));
kmem_free(zsb, sizeof (zfs_sb_t));
}