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ZIL: allow zil_commit() to fail with error

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This changes zil_commit() to have an int return, and updates all callers
to check it. There are no corresponding internal changes yet; it will
always return 0.

Since zil_commit() is an indication that the caller _really_ wants the
associated data to be durability stored, I've annotated it with the
__warn_unused_result__ compiler attribute (via __must_check), to emit a
warning if it's ever ussd without doing something with the return code.
I hope this will mean we never misuse it in the future.

Sponsored-by: Klara, Inc.
Sponsored-by: Wasabi Technology, Inc.
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com>
Signed-off-by: Rob Norris <rob.norris@klarasystems.com>
Closes #17398
This commit is contained in:
Rob Norris 2025-02-24 15:14:23 +11:00 committed by Brian Behlendorf
parent 1f8c39ddb2
commit 967b15b888
16 changed files with 147 additions and 85 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
cmd/ztest.c
View File

@ -2965,7 +2965,7 @@ ztest_zil_commit(ztest_ds_t *zd, uint64_t id)
(void) pthread_rwlock_rdlock(&zd->zd_zilog_lock);
zil_commit(zilog, ztest_random(ZTEST_OBJECTS));
VERIFY0(zil_commit(zilog, ztest_random(ZTEST_OBJECTS)));
/*
* Remember the committed values in zd, which is in parent/child
@ -7936,7 +7936,7 @@ ztest_freeze(void)
*/
while (BP_IS_HOLE(&zd->zd_zilog->zl_header->zh_log)) {
ztest_dmu_object_alloc_free(zd, 0);
zil_commit(zd->zd_zilog, 0);
VERIFY0(zil_commit(zd->zd_zilog, 0));
}
txg_wait_synced(spa_get_dsl(spa), 0);
@ -7978,7 +7978,7 @@ ztest_freeze(void)
/*
* Commit all of the changes we just generated.
*/
zil_commit(zd->zd_zilog, 0);
VERIFY0(zil_commit(zd->zd_zilog, 0));
txg_wait_synced(spa_get_dsl(spa), 0);
/*

4
include/os/freebsd/spl/sys/debug.h
View File

@ -69,6 +69,10 @@
#define __maybe_unused __attribute__((unused))
#endif
#ifndef __must_check
#define __must_check __attribute__((__warn_unused_result__))
#endif
/*
* Without this, we see warnings from objtool during normal Linux builds when
* the kernel is built with CONFIG_STACK_VALIDATION=y:

4
include/os/linux/spl/sys/debug.h
View File

@ -69,6 +69,10 @@
#define __maybe_unused __attribute__((unused))
#endif
#ifndef __must_check
#define __must_check __attribute__((__warn_unused_result__))
#endif
/*
* Without this, we see warnings from objtool during normal Linux builds when
* the kernel is built with CONFIG_STACK_VALIDATION=y:

3
include/sys/zil.h
View File

@ -610,8 +610,7 @@ extern void zil_itx_destroy(itx_t *itx);
extern void zil_itx_assign(zilog_t *zilog, itx_t *itx, dmu_tx_t *tx);
extern void zil_async_to_sync(zilog_t *zilog, uint64_t oid);
extern void zil_commit(zilog_t *zilog, uint64_t oid);
extern void zil_commit_impl(zilog_t *zilog, uint64_t oid);
extern int __must_check zil_commit(zilog_t *zilog, uint64_t oid);
extern void zil_remove_async(zilog_t *zilog, uint64_t oid);
extern int zil_reset(const char *osname, void *txarg);

4
lib/libspl/include/sys/debug.h
View File

@ -38,4 +38,8 @@
#define __maybe_unused __attribute__((unused))
#endif
#ifndef __must_check
#define __must_check __attribute__((warn_unused_result))
#endif
#endif

9
module/os/freebsd/zfs/zfs_vfsops.c
View File

@ -455,8 +455,13 @@ zfs_sync(vfs_t *vfsp, int waitfor)
return (0);
}
if (zfsvfs->z_log != NULL)
zil_commit(zfsvfs->z_log, 0);
if (zfsvfs->z_log != NULL) {
error = zil_commit(zfsvfs->z_log, 0);
if (error != 0) {
zfs_exit(zfsvfs, FTAG);
return (error);
}
}
zfs_exit(zfsvfs, FTAG);
} else {

46
module/os/freebsd/zfs/zfs_vnops_os.c
View File

@ -1193,8 +1193,8 @@ out:
*zpp = zp;
}
if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
zil_commit(zilog, 0);
if (error == 0 && zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
error = zil_commit(zilog, 0);
zfs_exit(zfsvfs, FTAG);
return (error);
@ -1323,9 +1323,8 @@ out:
if (xzp)
vrele(ZTOV(xzp));
if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
zil_commit(zilog, 0);
if (error == 0 && zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
error = zil_commit(zilog, 0);
zfs_exit(zfsvfs, FTAG);
return (error);
@ -1556,8 +1555,8 @@ out:
getnewvnode_drop_reserve();
if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
zil_commit(zilog, 0);
if (error == 0 && zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
error = zil_commit(zilog, 0);
zfs_exit(zfsvfs, FTAG);
return (error);
@ -1637,8 +1636,8 @@ zfs_rmdir_(vnode_t *dvp, vnode_t *vp, const char *name, cred_t *cr)
if (zfsvfs->z_use_namecache)
cache_vop_rmdir(dvp, vp);
out:
if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
zil_commit(zilog, 0);
if (error == 0 && zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
error = zil_commit(zilog, 0);
zfs_exit(zfsvfs, FTAG);
return (error);
@ -3009,8 +3008,8 @@ out:
}
out2:
if (os->os_sync == ZFS_SYNC_ALWAYS)
zil_commit(zilog, 0);
if (err == 0 && os->os_sync == ZFS_SYNC_ALWAYS)
err = zil_commit(zilog, 0);
zfs_exit(zfsvfs, FTAG);
return (err);
@ -3539,7 +3538,7 @@ out_seq:
out:
if (error == 0 && zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
zil_commit(zilog, 0);
error = zil_commit(zilog, 0);
zfs_exit(zfsvfs, FTAG);
return (error);
@ -3731,7 +3730,7 @@ zfs_symlink(znode_t *dzp, const char *name, vattr_t *vap,
*zpp = zp;
if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
zil_commit(zilog, 0);
error = zil_commit(zilog, 0);
}
zfs_exit(zfsvfs, FTAG);
@ -3921,8 +3920,8 @@ zfs_link(znode_t *tdzp, znode_t *szp, const char *name, cred_t *cr,
vnevent_link(ZTOV(szp), ct);
}
if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
zil_commit(zilog, 0);
if (error == 0 && zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
error = zil_commit(zilog, 0);
zfs_exit(zfsvfs, FTAG);
return (error);
@ -4510,8 +4509,13 @@ zfs_putpages(struct vnode *vp, vm_page_t *ma, size_t len, int flags,
out:
zfs_rangelock_exit(lr);
if (commit)
zil_commit(zfsvfs->z_log, zp->z_id);
if (commit) {
err = zil_commit(zfsvfs->z_log, zp->z_id);
if (err != 0) {
zfs_exit(zfsvfs, FTAG);
return (err);
}
}
dataset_kstats_update_write_kstats(&zfsvfs->z_kstat, len);
@ -6773,9 +6777,11 @@ zfs_deallocate(struct vop_deallocate_args *ap)
if (error == 0) {
if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS ||
(ap->a_ioflag & IO_SYNC) != 0)
zil_commit(zilog, zp->z_id);
*ap->a_offset = off + len;
*ap->a_len = 0;
error = zil_commit(zilog, zp->z_id);
if (error == 0) {
*ap->a_offset = off + len;
*ap->a_len = 0;
}
}
zfs_exit(zfsvfs, FTAG);

12
module/os/freebsd/zfs/zvol_os.c
View File

@ -727,9 +727,9 @@ unlock:
break;
}
if (commit) {
if (error == 0 && commit) {
commit:
zil_commit(zv->zv_zilog, ZVOL_OBJ);
error = zil_commit(zv->zv_zilog, ZVOL_OBJ);
}
resume:
rw_exit(&zv->zv_suspend_lock);
@ -906,8 +906,8 @@ zvol_cdev_write(struct cdev *dev, struct uio *uio_s, int ioflag)
zfs_rangelock_exit(lr);
int64_t nwritten = start_resid - zfs_uio_resid(&uio);
dataset_kstats_update_write_kstats(&zv->zv_kstat, nwritten);
if (commit)
zil_commit(zv->zv_zilog, ZVOL_OBJ);
if (error == 0 && commit)
error = zil_commit(zv->zv_zilog, ZVOL_OBJ);
rw_exit(&zv->zv_suspend_lock);
return (error);
@ -1117,7 +1117,7 @@ zvol_cdev_ioctl(struct cdev *dev, ulong_t cmd, caddr_t data,
case DIOCGFLUSH:
rw_enter(&zv->zv_suspend_lock, ZVOL_RW_READER);
if (zv->zv_zilog != NULL)
zil_commit(zv->zv_zilog, ZVOL_OBJ);
error = zil_commit(zv->zv_zilog, ZVOL_OBJ);
rw_exit(&zv->zv_suspend_lock);
break;
case DIOCGDELETE:
@ -1152,7 +1152,7 @@ zvol_cdev_ioctl(struct cdev *dev, ulong_t cmd, caddr_t data,
}
zfs_rangelock_exit(lr);
if (sync)
zil_commit(zv->zv_zilog, ZVOL_OBJ);
error = zil_commit(zv->zv_zilog, ZVOL_OBJ);
rw_exit(&zv->zv_suspend_lock);
break;
case DIOCGSTRIPESIZE:

4
module/os/linux/zfs/zfs_vfsops.c
View File

@ -288,10 +288,10 @@ zfs_sync(struct super_block *sb, int wait, cred_t *cr)
return (SET_ERROR(EIO));
}
zil_commit(zfsvfs->z_log, 0);
err = zil_commit(zfsvfs->z_log, 0);
zfs_exit(zfsvfs, FTAG);
return (0);
return (err);
}
static void

62
module/os/linux/zfs/zfs_vnops_os.c
View File

@ -841,8 +841,8 @@ out:
*zpp = zp;
}
if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
zil_commit(zilog, 0);
if (error == 0 && zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
error = zil_commit(zilog, 0);
zfs_exit(zfsvfs, FTAG);
return (error);
@ -1203,8 +1203,8 @@ out:
zfs_zrele_async(xzp);
}
if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
zil_commit(zilog, 0);
if (error == 0 && zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
error = zil_commit(zilog, 0);
zfs_exit(zfsvfs, FTAG);
return (error);
@ -1392,14 +1392,15 @@ out:
zfs_dirent_unlock(dl);
if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
zil_commit(zilog, 0);
if (error != 0) {
zrele(zp);
} else {
zfs_znode_update_vfs(dzp);
zfs_znode_update_vfs(zp);
if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
error = zil_commit(zilog, 0);
}
zfs_exit(zfsvfs, FTAG);
return (error);
@ -1528,8 +1529,8 @@ out:
zfs_znode_update_vfs(zp);
zrele(zp);
if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
zil_commit(zilog, 0);
if (error == 0 && zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
error = zil_commit(zilog, 0);
zfs_exit(zfsvfs, FTAG);
return (error);
@ -2630,8 +2631,8 @@ out:
}
out2:
if (os->os_sync == ZFS_SYNC_ALWAYS)
zil_commit(zilog, 0);
if (err == 0 && os->os_sync == ZFS_SYNC_ALWAYS)
err = zil_commit(zilog, 0);
out3:
kmem_free(xattr_bulk, sizeof (sa_bulk_attr_t) * bulks);
@ -3235,8 +3236,8 @@ out:
zfs_dirent_unlock(sdl);
zfs_dirent_unlock(tdl);
if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
zil_commit(zilog, 0);
if (error == 0 && zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
error = zil_commit(zilog, 0);
zfs_exit(zfsvfs, FTAG);
return (error);
@ -3436,7 +3437,7 @@ top:
*zpp = zp;
if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
zil_commit(zilog, 0);
error = zil_commit(zilog, 0);
} else {
zrele(zp);
}
@ -3670,18 +3671,20 @@ top:
zfs_dirent_unlock(dl);
if (!is_tmpfile && zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
zil_commit(zilog, 0);
if (error == 0) {
if (!is_tmpfile && zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
error = zil_commit(zilog, 0);
if (is_tmpfile && zfsvfs->z_os->os_sync != ZFS_SYNC_DISABLED) {
txg_wait_flag_t wait_flags =
spa_get_failmode(dmu_objset_spa(zfsvfs->z_os)) ==
ZIO_FAILURE_MODE_CONTINUE ? TXG_WAIT_SUSPEND : 0;
error = txg_wait_synced_flags(dmu_objset_pool(zfsvfs->z_os),
txg, wait_flags);
if (error != 0) {
ASSERT3U(error, ==, ESHUTDOWN);
error = SET_ERROR(EIO);
if (is_tmpfile && zfsvfs->z_os->os_sync != ZFS_SYNC_DISABLED) {
txg_wait_flag_t wait_flags =
spa_get_failmode(dmu_objset_spa(zfsvfs->z_os)) ==
ZIO_FAILURE_MODE_CONTINUE ? TXG_WAIT_SUSPEND : 0;
error = txg_wait_synced_flags(
dmu_objset_pool(zfsvfs->z_os), txg, wait_flags);
if (error != 0) {
ASSERT3U(error, ==, ESHUTDOWN);
error = SET_ERROR(EIO);
}
}
}
@ -3939,8 +3942,13 @@ zfs_putpage(struct inode *ip, struct page *pp, struct writeback_control *wbc,
zfs_rangelock_exit(lr);
if (need_commit)
zil_commit(zfsvfs->z_log, zp->z_id);
if (need_commit) {
err = zil_commit(zfsvfs->z_log, zp->z_id);
if (err != 0) {
zfs_exit(zfsvfs, FTAG);
return (err);
}
}
dataset_kstats_update_write_kstats(&zfsvfs->z_kstat, pglen);

12
module/os/linux/zfs/zpl_file.c
View File

@ -22,6 +22,7 @@
/*
* Copyright (c) 2011, Lawrence Livermore National Security, LLC.
* Copyright (c) 2015 by Chunwei Chen. All rights reserved.
* Copyright (c) 2025, Klara, Inc.
*/
@ -495,9 +496,18 @@ zpl_writepages(struct address_space *mapping, struct writeback_control *wbc)
if ((result = zpl_enter_verify_zp(zfsvfs, zp, FTAG)) != 0)
return (result);
if (zfsvfs->z_log != NULL)
zil_commit(zfsvfs->z_log, zp->z_id);
result = -zil_commit(zfsvfs->z_log, zp->z_id);
zpl_exit(zfsvfs, FTAG);
/*
* If zil_commit() failed, it's unclear what state things
* are currently in. putpage() has written back out what
* it can to the DMU, but it may not be on disk. We have
* little choice but to escape.
*/
if (result != 0)
return (result);
/*
* We need to call write_cache_pages() again (we can't just
* return after the commit) because the previous call in

16
module/os/linux/zfs/zvol_os.c
View File

@ -208,8 +208,14 @@ zvol_write(zv_request_t *zvr)
disk = zv->zv_zso->zvo_disk;
/* bio marked as FLUSH need to flush before write */
if (io_is_flush(bio, rq))
zil_commit(zv->zv_zilog, ZVOL_OBJ);
if (io_is_flush(bio, rq)) {
error = zil_commit(zv->zv_zilog, ZVOL_OBJ);
if (error != 0) {
rw_exit(&zv->zv_suspend_lock);
zvol_end_io(bio, rq, -error);
return;
}
}
/* Some requests are just for flush and nothing else. */
if (io_size(bio, rq) == 0) {
@ -273,8 +279,8 @@ zvol_write(zv_request_t *zvr)
dataset_kstats_update_write_kstats(&zv->zv_kstat, nwritten);
task_io_account_write(nwritten);
if (sync)
zil_commit(zv->zv_zilog, ZVOL_OBJ);
if (error == 0 && sync)
error = zil_commit(zv->zv_zilog, ZVOL_OBJ);
rw_exit(&zv->zv_suspend_lock);
@ -361,7 +367,7 @@ zvol_discard(zv_request_t *zvr)
zfs_rangelock_exit(lr);
if (error == 0 && sync)
zil_commit(zv->zv_zilog, ZVOL_OBJ);
error = zil_commit(zv->zv_zilog, ZVOL_OBJ);
unlock:
rw_exit(&zv->zv_suspend_lock);

2
module/zfs/zfs_sa.c
View File

@ -286,7 +286,7 @@ zfs_sa_set_xattr(znode_t *zp, const char *name, const void *value, size_t vsize)
dmu_tx_commit(tx);
if (logsaxattr && zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
zil_commit(zilog, 0);
error = zil_commit(zilog, 0);
}
out_free:
vmem_free(obj, size);

27
module/zfs/zfs_vnops.c
View File

@ -27,6 +27,7 @@
* Copyright 2017 Nexenta Systems, Inc.
* Copyright (c) 2021, 2022 by Pawel Jakub Dawidek
* Copyright (c) 2025, Rob Norris <robn@despairlabs.com>
* Copyright (c) 2025, Klara, Inc.
*/
/* Portions Copyright 2007 Jeremy Teo */
@ -116,7 +117,7 @@ zfs_fsync(znode_t *zp, int syncflag, cred_t *cr)
if (zfsvfs->z_os->os_sync != ZFS_SYNC_DISABLED) {
if ((error = zfs_enter_verify_zp(zfsvfs, zp, FTAG)) != 0)
return (error);
zil_commit(zfsvfs->z_log, zp->z_id);
error = zil_commit(zfsvfs->z_log, zp->z_id);
zfs_exit(zfsvfs, FTAG);
}
return (error);
@ -375,8 +376,13 @@ zfs_read(struct znode *zp, zfs_uio_t *uio, int ioflag, cred_t *cr)
frsync = !!(ioflag & FRSYNC);
#endif
if (zfsvfs->z_log &&
(frsync || zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS))
zil_commit(zfsvfs->z_log, zp->z_id);
(frsync || zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)) {
error = zil_commit(zfsvfs->z_log, zp->z_id);
if (error != 0) {
zfs_exit(zfsvfs, FTAG);
return (error);
}
}
/*
* Lock the range against changes.
@ -1074,8 +1080,13 @@ zfs_write(znode_t *zp, zfs_uio_t *uio, int ioflag, cred_t *cr)
return (error);
}
if (commit)
zil_commit(zilog, zp->z_id);
if (commit) {
error = zil_commit(zilog, zp->z_id);
if (error != 0) {
zfs_exit(zfsvfs, FTAG);
return (error);
}
}
int64_t nwritten = start_resid - zfs_uio_resid(uio);
dataset_kstats_update_write_kstats(&zfsvfs->z_kstat, nwritten);
@ -1260,8 +1271,8 @@ zfs_setsecattr(znode_t *zp, vsecattr_t *vsecp, int flag, cred_t *cr)
zilog = zfsvfs->z_log;
error = zfs_setacl(zp, vsecp, skipaclchk, cr);
if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
zil_commit(zilog, 0);
if (error == 0 && zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
error = zil_commit(zilog, 0);
zfs_exit(zfsvfs, FTAG);
return (error);
@ -1946,7 +1957,7 @@ unlock:
ZFS_ACCESSTIME_STAMP(inzfsvfs, inzp);
if (outos->os_sync == ZFS_SYNC_ALWAYS) {
zil_commit(zilog, outzp->z_id);
error = zil_commit(zilog, outzp->z_id);
}
*inoffp += done;

19
module/zfs/zil.c
View File

@ -3640,7 +3640,9 @@ zil_commit_itx_assign(zilog_t *zilog, zil_commit_waiter_t *zcw)
* but the order in which they complete will be the same order in
* which they were created.
*/
void
static int zil_commit_impl(zilog_t *zilog, uint64_t foid);
int
zil_commit(zilog_t *zilog, uint64_t foid)
{
/*
@ -3659,7 +3661,7 @@ zil_commit(zilog_t *zilog, uint64_t foid)
ASSERT3B(dmu_objset_is_snapshot(zilog->zl_os), ==, B_FALSE);
if (zilog->zl_sync == ZFS_SYNC_DISABLED)
return;
return (0);
if (!spa_writeable(zilog->zl_spa)) {
/*
@ -3673,7 +3675,7 @@ zil_commit(zilog_t *zilog, uint64_t foid)
ASSERT0P(zilog->zl_last_lwb_opened);
for (int i = 0; i < TXG_SIZE; i++)
ASSERT0P(zilog->zl_itxg[i].itxg_itxs);
return;
return (0);
}
/*
@ -3686,13 +3688,13 @@ zil_commit(zilog_t *zilog, uint64_t foid)
if (zilog->zl_suspend > 0) {
ZIL_STAT_BUMP(zilog, zil_commit_suspend_count);
txg_wait_synced(zilog->zl_dmu_pool, 0);
return;
return (0);
}
zil_commit_impl(zilog, foid);
return (zil_commit_impl(zilog, foid));
}
void
static int
zil_commit_impl(zilog_t *zilog, uint64_t foid)
{
ZIL_STAT_BUMP(zilog, zil_commit_count);
@ -3748,6 +3750,8 @@ zil_commit_impl(zilog_t *zilog, uint64_t foid)
}
zil_free_commit_waiter(zcw);
return (0);
}
/*
@ -4025,7 +4029,8 @@ zil_close(zilog_t *zilog)
uint64_t txg;
if (!dmu_objset_is_snapshot(zilog->zl_os)) {
zil_commit(zilog, 0);
if (zil_commit(zilog, 0) != 0)
txg_wait_synced(zilog->zl_dmu_pool, 0);
} else {
ASSERT(list_is_empty(&zilog->zl_lwb_list));
ASSERT0(zilog->zl_dirty_max_txg);

2
module/zfs/zvol.c
View File

@ -772,7 +772,7 @@ zvol_clone_range(zvol_state_t *zv_src, uint64_t inoff, zvol_state_t *zv_dst,
zfs_rangelock_exit(outlr);
zfs_rangelock_exit(inlr);
if (error == 0 && zv_dst->zv_objset->os_sync == ZFS_SYNC_ALWAYS) {
zil_commit(zilog_dst, ZVOL_OBJ);
error = zil_commit(zilog_dst, ZVOL_OBJ);
}
out:
if (zv_src != zv_dst)