fs: introduce vfs_path_lookup

[safe/jmp/linux-2.6] / fs / namei.c

diff --git a/fs/namei.c b/fs/namei.c
index defaa47..3bdb296 100644 (file)
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1172,6 +1172,37 @@ int fastcall path_lookup(const char *name, unsigned int flags,
        return do_path_lookup(AT_FDCWD, name, flags, nd);
 }
 
+/**
+ * vfs_path_lookup - lookup a file path relative to a dentry-vfsmount pair
+ * @dentry:  pointer to dentry of the base directory
+ * @mnt: pointer to vfs mount of the base directory
+ * @name: pointer to file name
+ * @flags: lookup flags
+ * @nd: pointer to nameidata
+ */
+int vfs_path_lookup(struct dentry *dentry, struct vfsmount *mnt,
+                   const char *name, unsigned int flags,
+                   struct nameidata *nd)
+{
+       int retval;
+
+       /* same as do_path_lookup */
+       nd->last_type = LAST_ROOT;
+       nd->flags = flags;
+       nd->depth = 0;
+
+       nd->mnt = mntget(mnt);
+       nd->dentry = dget(dentry);
+
+       retval = path_walk(name, nd);
+       if (unlikely(!retval && !audit_dummy_context() && nd->dentry &&
+                               nd->dentry->d_inode))
+               audit_inode(name, nd->dentry->d_inode);
+
+       return retval;
+
+}
+
 static int __path_lookup_intent_open(int dfd, const char *name,
                unsigned int lookup_flags, struct nameidata *nd,
                int open_flags, int create_mode)
@@ -2774,6 +2805,7 @@ EXPORT_SYMBOL(__page_symlink);
 EXPORT_SYMBOL(page_symlink);
 EXPORT_SYMBOL(page_symlink_inode_operations);
 EXPORT_SYMBOL(path_lookup);
+EXPORT_SYMBOL(vfs_path_lookup);
 EXPORT_SYMBOL(path_release);
 EXPORT_SYMBOL(path_walk);
 EXPORT_SYMBOL(permission);