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gfs2_atomic_open(): skip lookups on hashed dentry

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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>
This commit is contained in:
Al Viro 2014-09-12 18:21:05 -04:00
parent 18c85d09dc
commit 4d93bc3e81
1 changed files with 5 additions and 0 deletions
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5
fs/gfs2/inode.c
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@ -1244,6 +1244,9 @@ static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
struct dentry *d; struct dentry *d;
bool excl = !!(flags & O_EXCL); bool excl = !!(flags & O_EXCL);
if (!d_unhashed(dentry))
goto skip_lookup;
d = __gfs2_lookup(dir, dentry, file, opened); d = __gfs2_lookup(dir, dentry, file, opened);
if (IS_ERR(d)) if (IS_ERR(d))
return PTR_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); BUG_ON(d != NULL);
skip_lookup:
if (!(flags & O_CREAT)) if (!(flags & O_CREAT))
return -ENOENT; return -ENOENT;