fs: support RENAME_NOREPLACE for local filesystems

This is trivial to do:

 - add flags argument to foo_rename()
 - check if flags doesn't have any other than RENAME_NOREPLACE
 - assign foo_rename() to .rename2 instead of .rename

Filesystems converted:

affs, bfs, exofs, ext2, hfs, hfsplus, jffs2, jfs, logfs, minix, msdos,
nilfs2, omfs, reiserfs, sysvfs, ubifs, udf, ufs, vfat.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Acked-by: Boaz Harrosh <ooo@electrozaur.com>
Acked-by: Richard Weinberger <richard@nod.at>
Acked-by: Bob Copeland <me@bobcopeland.com>
Acked-by: Jan Kara <jack@suse.cz>
Cc: Theodore Ts'o <tytso@mit.edu>
Cc: Jaegeuk Kim <jaegeuk@kernel.org>
Cc: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Cc: Mikulas Patocka <mpatocka@redhat.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Dave Kleikamp <shaggy@kernel.org>
Cc: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Cc: Christoph Hellwig <hch@infradead.org>

3 files changed, 8 insertions, 3 deletions

diff --git a/fs/affs/affs.h b/fs/affs/affs.h
index cc2b2efc9211..2f088773f1c0 100644
--- a/fs/affs/affs.h
+++ b/fs/affs/affs.h
@@ -173,7 +173,8 @@ extern int	affs_link(struct dentry *olddentry, struct inode *dir,
 extern int      affs_symlink(struct inode *dir, struct dentry *dentry,
                              const char *symname);
 extern int      affs_rename(struct inode *old_dir, struct dentry *old_dentry,
-                            struct inode *new_dir, struct dentry *new_dentry);
+                            struct inode *new_dir, struct dentry *new_dentry,
+                            unsigned int flags);
 
 /* inode.c */
 
diff --git a/fs/affs/dir.c b/fs/affs/dir.c
index f1e7294381c5..8f127c239472 100644
--- a/fs/affs/dir.c
+++ b/fs/affs/dir.c
@@ -35,7 +35,7 @@ const struct inode_operations affs_dir_inode_operations = {
         .symlink        = affs_symlink,
         .mkdir          = affs_mkdir,
         .rmdir          = affs_rmdir,
-        .rename         = affs_rename,
+        .rename2        = affs_rename,
         .setattr        = affs_notify_change,
 };
 
diff --git a/fs/affs/namei.c b/fs/affs/namei.c
index a2d68f828d53..29186d29a3b6 100644
--- a/fs/affs/namei.c
+++ b/fs/affs/namei.c
@@ -414,12 +414,16 @@ affs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry)
 
 int
 affs_rename(struct inode *old_dir, struct dentry *old_dentry,
-            struct inode *new_dir, struct dentry *new_dentry)
+            struct inode *new_dir, struct dentry *new_dentry,
+            unsigned int flags)
 {
         struct super_block *sb = old_dir->i_sb;
         struct buffer_head *bh = NULL;
         int retval;
 
+        if (flags & ~RENAME_NOREPLACE)
+                return -EINVAL;
+
         pr_debug("%s(old=%lu,\"%pd\" to new=%lu,\"%pd\")\n", __func__,
                  old_dir->i_ino, old_dentry, new_dir->i_ino, new_dentry);