btrfs: add RENAME_NOREPLACE

RENAME_NOREPLACE is trivial to implement for most filesystems: switch over
to ->rename2() and check for the supported flags.  The rest is done by the
VFS.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Cc: Chris Mason <clm@fb.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 11 insertions, 1 deletions

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 3668048e16f8..3183742d6f0d 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -8476,6 +8476,16 @@ out_notrans:
         return ret;
 }
 
+static int btrfs_rename2(struct inode *old_dir, struct dentry *old_dentry,
+                         struct inode *new_dir, struct dentry *new_dentry,
+                         unsigned int flags)
+{
+        if (flags & ~RENAME_NOREPLACE)
+                return -EINVAL;
+
+        return btrfs_rename(old_dir, old_dentry, new_dir, new_dentry);
+}
+
 static void btrfs_run_delalloc_work(struct btrfs_work *work)
 {
         struct btrfs_delalloc_work *delalloc_work;
@@ -9019,7 +9029,7 @@ static const struct inode_operations btrfs_dir_inode_operations = {
         .link           = btrfs_link,
         .mkdir          = btrfs_mkdir,
         .rmdir          = btrfs_rmdir,
-        .rename         = btrfs_rename,
+        .rename2        = btrfs_rename2,
         .symlink        = btrfs_symlink,
         .setattr        = btrfs_setattr,
         .mknod          = btrfs_mknod,