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, 8 insertions, 3 deletions

diff --git a/fs/jffs2/dir.c b/fs/jffs2/dir.c
index 30eb33ff8189..11e711b12ccf 100644
--- a/fs/jffs2/dir.c
+++ b/fs/jffs2/dir.c
@@ -35,7 +35,8 @@ static int jffs2_mkdir (struct inode *,struct dentry *,umode_t);
 static int jffs2_rmdir (struct inode *,struct dentry *);
 static int jffs2_mknod (struct inode *,struct dentry *,umode_t,dev_t);
 static int jffs2_rename (struct inode *, struct dentry *,
-                         struct inode *, struct dentry *);
+                         struct inode *, struct dentry *,
+                         unsigned int);
 
 const struct file_operations jffs2_dir_operations =
 {
@@ -57,7 +58,7 @@ const struct inode_operations jffs2_dir_inode_operations =
         .mkdir =        jffs2_mkdir,
         .rmdir =        jffs2_rmdir,
         .mknod =        jffs2_mknod,
-        .rename =       jffs2_rename,
+        .rename2 =      jffs2_rename,
         .get_acl =      jffs2_get_acl,
         .set_acl =      jffs2_set_acl,
         .setattr =      jffs2_setattr,
@@ -759,7 +760,8 @@ static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, umode_t mode
 }
 
 static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
-                         struct inode *new_dir_i, struct dentry *new_dentry)
+                         struct inode *new_dir_i, struct dentry *new_dentry,
+                         unsigned int flags)
 {
         int ret;
         struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb);
@@ -767,6 +769,9 @@ static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
         uint8_t type;
         uint32_t now;
 
+        if (flags & ~RENAME_NOREPLACE)
+                return -EINVAL;
+
         /* The VFS will check for us and prevent trying to rename a
          * file over a directory and vice versa, but if it's a directory,
          * the VFS can't check whether the victim is empty. The filesystem