Author: mjg
Date: Wed Nov 30 02:14:53 2016
New Revision: 309307
URL: https://svnweb.freebsd.org/changeset/base/309307
Log:
vfs: avoid VOP_ISLOCKED in the common case in lookup
Modified:
head/sys/kern/vfs_lookup.c
Modified: head/sys/kern/vfs_lookup.c
==============================================================================
--- head/sys/kern/vfs_lookup.c Wed Nov 30 02:00:30 2016 (r309306)
+++ head/sys/kern/vfs_lookup.c Wed Nov 30 02:14:53 2016 (r309307)
@@ -807,10 +807,9 @@ unionlookup:
* If we have a shared lock we may need to upgrade the lock for the
* last operation.
*/
- if (dp != vp_crossmp &&
- VOP_ISLOCKED(dp) == LK_SHARED &&
- (cnp->cn_flags & ISLASTCN) && (cnp->cn_flags & LOCKPARENT))
- vn_lock(dp, LK_UPGRADE|LK_RETRY);
+ if ((cnp->cn_flags & LOCKPARENT) && (cnp->cn_flags & ISLASTCN) &&
+ dp != vp_crossmp && VOP_ISLOCKED(dp) == LK_SHARED)
+ vn_lock(dp, LK_UPGRADE|LK_RETRY);
if ((dp->v_iflag & VI_DOOMED) != 0) {
error = ENOENT;
goto bad;
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