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>

2 files changed, 12 insertions, 4 deletions

diff --git a/fs/fat/namei_msdos.c b/fs/fat/namei_msdos.c
index 664655b2c55f..6c814699d5d5 100644
--- a/fs/fat/namei_msdos.c
+++ b/fs/fat/namei_msdos.c
@@ -596,12 +596,16 @@ error_inode:
 
 /***** Rename, a wrapper for rename_same_dir & rename_diff_dir */
 static int msdos_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;
         unsigned char old_msdos_name[MSDOS_NAME], new_msdos_name[MSDOS_NAME];
         int err, is_hid;
 
+        if (flags & ~RENAME_NOREPLACE)
+                return -EINVAL;
+
         mutex_lock(&MSDOS_SB(sb)->s_lock);
 
         err = msdos_format_name(old_dentry->d_name.name,
@@ -633,7 +637,7 @@ static const struct inode_operations msdos_dir_inode_operations = {
         .unlink         = msdos_unlink,
         .mkdir          = msdos_mkdir,
         .rmdir          = msdos_rmdir,
-        .rename         = msdos_rename,
+        .rename2        = msdos_rename,
         .setattr        = fat_setattr,
         .getattr        = fat_getattr,
 };
diff --git a/fs/fat/namei_vfat.c b/fs/fat/namei_vfat.c
index 92b7363dafa9..ce8986f3918a 100644
--- a/fs/fat/namei_vfat.c
+++ b/fs/fat/namei_vfat.c
@@ -903,7 +903,8 @@ out:
 }
 
 static int vfat_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 buffer_head *dotdot_bh;
         struct msdos_dir_entry *dotdot_de;
@@ -914,6 +915,9 @@ static int vfat_rename(struct inode *old_dir, struct dentry *old_dentry,
         int err, is_dir, update_dotdot, corrupt = 0;
         struct super_block *sb = old_dir->i_sb;
 
+        if (flags & ~RENAME_NOREPLACE)
+                return -EINVAL;
+
         old_sinfo.bh = sinfo.bh = dotdot_bh = NULL;
         old_inode = d_inode(old_dentry);
         new_inode = d_inode(new_dentry);
@@ -1036,7 +1040,7 @@ static const struct inode_operations vfat_dir_inode_operations = {
         .unlink         = vfat_unlink,
         .mkdir          = vfat_mkdir,
         .rmdir          = vfat_rmdir,
-        .rename         = vfat_rename,
+        .rename2        = vfat_rename,
         .setattr        = fat_setattr,
         .getattr        = fat_getattr,
 };