make lookup_one_len() safe to use with directory locked shared

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

diff --git a/fs/namei.c b/fs/namei.c
index ba48e154409bcca575b1d7548ece054a31394ec9..6e0f6eea98960fbaf79357ae56d2425c7e224d15 100644 (file)
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2471,6 +2471,7 @@ static int lookup_one_len_common(const char *name, struct dentry *base,
  */
 struct dentry *lookup_one_len(const char *name, struct dentry *base, int len)
 {
+       struct dentry *dentry;
        struct qstr this;
        int err;
 
@@ -2480,7 +2481,8 @@ struct dentry *lookup_one_len(const char *name, struct dentry *base, int len)
        if (err)
                return ERR_PTR(err);
 
-       return __lookup_hash(&this, base, 0);
+       dentry = lookup_dcache(&this, base, 0);
+       return dentry ? dentry : __lookup_slow(&this, base, 0);
 }
 EXPORT_SYMBOL(lookup_one_len);