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Fix iput() calls within a tx 

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 committed by Tony Hutter
parent 00a1a11989
commit ebef1f2fb6
1 changed files with 19 additions and 10 deletions
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29
module/zfs/zfs_vnops.c
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@ -1602,13 +1602,13 @@ 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;
}
#ifdef HAVE_PN_UTILS
@ -1616,6 +1616,9 @@ top:
pn_free(realnmp);
#endif /* HAVE_PN_UTILS */
dmu_tx_abort(tx);
iput(ip);
if (xzp)
iput(ZTOI(xzp));
ZFS_EXIT(zsb);
return (error);
}
@ -1944,14 +1947,15 @@ 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);
}
@ -3025,8 +3029,6 @@ out:
ASSERT(err2 == 0);
}
if (attrzp)
iput(ZTOI(attrzp));
if (aclp)
zfs_acl_free(aclp);
@ -3037,11 +3039,15 @@ 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);
}
@ -3074,7 +3080,7 @@ 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));
@ -3411,16 +3417,19 @@ 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);
}