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>

1 files changed, 6 insertions, 2 deletions

diff --git a/fs/sysv/namei.c b/fs/sysv/namei.c
index a42de45ce40d..765d79de1217 100644
--- a/fs/sysv/namei.c
+++ b/fs/sysv/namei.c
@@ -206,7 +206,8 @@ static int sysv_rmdir(struct inode * dir, struct dentry * dentry)
  * higher-level routines.
  */
 static int sysv_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);
@@ -216,6 +217,9 @@ static int sysv_rename(struct inode * old_dir, struct dentry * old_dentry,
         struct sysv_dir_entry * old_de;
         int err = -ENOENT;
 
+        if (flags & ~RENAME_NOREPLACE)
+                return -EINVAL;
+
         old_de = sysv_find_entry(old_dentry, &old_page);
         if (!old_de)
                 goto out;
@@ -285,6 +289,6 @@ const struct inode_operations sysv_dir_inode_operations = {
         .mkdir          = sysv_mkdir,
         .rmdir          = sysv_rmdir,
         .mknod          = sysv_mknod,
-        .rename         = sysv_rename,
+        .rename2        = sysv_rename,
         .getattr        = sysv_getattr,
 };