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gfs2_atomic_open(): skip lookups on hashed dentry
author
Al Viro
<viro@zeniv.linux.org.uk>
Fri, 12 Sep 2014 22:21:05 +0000
(18:21 -0400)
committer
Al Viro
<viro@zeniv.linux.org.uk>
Thu, 9 Oct 2014 06:39:15 +0000
(
02:39
-0400)
hashed dentry can be passed to ->atomic_open() only if
a) it has just passed revalidation and
b) it's negative
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
fs/gfs2/inode.c
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diff --git
a/fs/gfs2/inode.c
b/fs/gfs2/inode.c
index
fc8ac2e
..
8108b4f
100644
(file)
--- a/
fs/gfs2/inode.c
+++ b/
fs/gfs2/inode.c
@@
-1244,6
+1244,9
@@
static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
struct dentry *d;
bool excl = !!(flags & O_EXCL);
+ if (!d_unhashed(dentry))
+ goto skip_lookup;
+
d = __gfs2_lookup(dir, dentry, file, opened);
if (IS_ERR(d))
return PTR_ERR(d);
@@
-1260,6
+1263,8
@@
static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
}
BUG_ON(d != NULL);
+
+skip_lookup:
if (!(flags & O_CREAT))
return -ENOENT;