untangling do_lookup() - get rid of need_reval in !dentry case

Everything arriving into if (!dentry) will have need_reval = 1.
Indeed, the only way to get there with need_reval reset to 0 would
be via
	if (unlikely(d_need_lookup(dentry)))
		goto unlazy;
	if (unlikely(dentry->d_flags & DCACHE_OP_REVALIDATE)) {
		status = d_revalidate(dentry, nd);
	if (unlikely(status <= 0)) {
		if (status != -ECHILD)
			need_reval = 0;
		goto unlazy;
...
unlazy:
	/* no assignments to dentry */
	if (dentry && unlikely(d_need_lookup(dentry))) {
		dput(dentry);
		dentry = NULL;
	}
and if d_need_lookup() had already been false the first time around, it
will remain false on the second call as well.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 1 insertions, 6 deletions

diff --git a/fs/namei.c b/fs/namei.c
index 9ce43a358c33..14bb00a9fa9a 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1181,7 +1181,6 @@ retry:
                                 return PTR_ERR(dentry);
                         }
                         /* known good */
-                        need_reval = 0;
                         status = 1;
                 } else if (unlikely(d_need_lookup(dentry))) {
                         dentry = d_inode_lookup(parent, dentry, nd);
@@ -1190,10 +1189,8 @@ retry:
                                 return PTR_ERR(dentry);
                         }
                         /* known good */
-                        need_reval = 0;
                         status = 1;
-                }
-                if (unlikely(dentry->d_flags & DCACHE_OP_REVALIDATE) && need_reval)
+                } else if (unlikely(dentry->d_flags & DCACHE_OP_REVALIDATE))
                         status = d_revalidate(dentry, nd);
                 if (unlikely(status <= 0)) {
                         if (status < 0) {
@@ -1209,7 +1206,6 @@ retry:
                                         return PTR_ERR(dentry);
                                 }
                                 /* known good */
-                                need_reval = 0;
                                 status = 1;
                         }
                 }
@@ -1226,7 +1222,6 @@ retry:
                 if (!d_invalidate(dentry)) {
                         dput(dentry);
                         dentry = NULL;
-                        need_reval = 1;
                         goto retry;
                 }
         }