vfs: lookup_open(): expand lookup_hash()

Copy __lookup_hash() into lookup_open().  The next patch will insert the atomic
open call just before the real lookup.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/fs/namei.c b/fs/namei.c
index fad7117..ccb0eb1 100644 (file)
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2209,14 +2209,24 @@ static struct file *lookup_open(struct nameidata *nd, struct path *path,
                                int *want_write, bool *created)
 {
        struct dentry *dir = nd->path.dentry;
+       struct inode *dir_inode = dir->d_inode;
        struct dentry *dentry;
        int error;
+       bool need_lookup;
 
        *created = false;
-       dentry = lookup_hash(nd);
+       dentry = lookup_dcache(&nd->last, dir, nd, &need_lookup);
        if (IS_ERR(dentry))
                return ERR_CAST(dentry);
 
+       if (need_lookup) {
+               BUG_ON(dentry->d_inode);
+
+               dentry = lookup_real(dir_inode, dentry, nd);
+               if (IS_ERR(dentry))
+                       return ERR_CAST(dentry);
+       }
+
        /* Negative dentry, just create the file */
        if (!dentry->d_inode && (op->open_flag & O_CREAT)) {
                umode_t mode = op->mode;