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>

fs/nilfs2/namei.c

@@ -350,7 +350,8 @@ static int nilfs_rmdir(struct inode *dir, struct dentry *dentry)
 }
 
 static int nilfs_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 inode *old_inode = d_inode(old_dentry);
 	struct inode *new_inode = d_inode(new_dentry);
@@ -361,6 +362,9 @@ static int nilfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 	struct nilfs_transaction_info ti;
 	int err;
 
+	if (flags & ~RENAME_NOREPLACE)
+		return -EINVAL;
+
 	err = nilfs_transaction_begin(old_dir->i_sb, &ti, 1);
 	if (unlikely(err))
 		return err;
@@ -552,7 +556,7 @@ const struct inode_operations nilfs_dir_inode_operations = {
 	.mkdir		= nilfs_mkdir,
 	.rmdir		= nilfs_rmdir,
 	.mknod		= nilfs_mknod,
-	.rename		= nilfs_rename,
+	.rename2	= nilfs_rename,
 	.setattr	= nilfs_setattr,
 	.permission	= nilfs_permission,
 	.fiemap		= nilfs_fiemap,