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Fix iput() calls within a tx

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As explicitly stated in section 2 of the 'Programming rules'
comments at the top of zfs_vnops.c.

  If you must call iput() within a tx then use zfs_iput_async().

Move iput() calls after dmu_tx_commit() / dmu_tx_abort when
possible.  When not possible convert the iput() calls to
zfs_iput_async().

Reviewed-by: Don Brady <don.brady@intel.com>
Reviewed-by: Chunwei Chen <david.chen@osnexus.com>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #5758
This commit is contained in:
Brian Behlendorf 2017-02-07 18:57:50 -05:00
parent d834b9ce5b
commit ea7e86d8db
1 changed files with 23 additions and 15 deletions
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38
module/zfs/zfs_vnops.c
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@ -1778,18 +1778,21 @@ top:
error = dmu_tx_assign(tx, waited ? TXG_WAITED : TXG_NOWAIT);
if (error) {
zfs_dirent_unlock(dl);
iput(ip);
if (xzp)
iput(ZTOI(xzp));
if (error == ERESTART) {
waited = B_TRUE;
dmu_tx_wait(tx);
dmu_tx_abort(tx);
iput(ip);
if (xzp)
iput(ZTOI(xzp));
goto top;
}
if (realnmp)
pn_free(realnmp);
dmu_tx_abort(tx);
iput(ip);
if (xzp)
iput(ZTOI(xzp));
ZFS_EXIT(zsb);
return (error);
}
@ -1847,8 +1850,6 @@ top:
*/
zfs_unlinked_add(zp, tx);
mutex_exit(&zp->z_lock);
zfs_inode_update(zp);
iput(ip);
} else if (unlinked) {
mutex_exit(&zp->z_lock);
zfs_unlinked_add(zp, tx);
@ -1866,11 +1867,12 @@ out:
zfs_dirent_unlock(dl);
zfs_inode_update(dzp);
zfs_inode_update(zp);
if (!delete_now) {
zfs_inode_update(zp);
if (delete_now)
iput(ip);
else
zfs_iput_async(ip);
}
if (xzp) {
zfs_inode_update(xzp);
@ -2161,14 +2163,15 @@ top:
rw_exit(&zp->z_parent_lock);
rw_exit(&zp->z_name_lock);
zfs_dirent_unlock(dl);
iput(ip);
if (error == ERESTART) {
waited = B_TRUE;
dmu_tx_wait(tx);
dmu_tx_abort(tx);
iput(ip);
goto top;
}
dmu_tx_abort(tx);
iput(ip);
ZFS_EXIT(zsb);
return (error);
}
@ -3242,8 +3245,6 @@ out:
ASSERT(err2 == 0);
}
if (attrzp)
iput(ZTOI(attrzp));
if (aclp)
zfs_acl_free(aclp);
@ -3254,11 +3255,15 @@ out:
if (err) {
dmu_tx_abort(tx);
if (attrzp)
iput(ZTOI(attrzp));
if (err == ERESTART)
goto top;
} else {
err2 = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx);
dmu_tx_commit(tx);
if (attrzp)
iput(ZTOI(attrzp));
zfs_inode_update(zp);
}
@ -3291,7 +3296,7 @@ zfs_rename_unlock(zfs_zlock_t **zlpp)
while ((zl = *zlpp) != NULL) {
if (zl->zl_znode != NULL)
iput(ZTOI(zl->zl_znode));
zfs_iput_async(ZTOI(zl->zl_znode));
rw_exit(zl->zl_rwlock);
*zlpp = zl->zl_next;
kmem_free(zl, sizeof (*zl));
@ -3636,16 +3641,19 @@ top:
if (sdzp == tdzp)
rw_exit(&sdzp->z_name_lock);
iput(ZTOI(szp));
if (tzp)
iput(ZTOI(tzp));
if (error == ERESTART) {
waited = B_TRUE;
dmu_tx_wait(tx);
dmu_tx_abort(tx);
iput(ZTOI(szp));
if (tzp)
iput(ZTOI(tzp));
goto top;
}
dmu_tx_abort(tx);
iput(ZTOI(szp));
if (tzp)
iput(ZTOI(tzp));
ZFS_EXIT(zsb);
return (error);
}