fs: make remaining filesystems use .rename2

This is trivial to do:

 - add flags argument to foo_rename()
 - check if flags is zero
 - assign foo_rename() to .rename2 instead of .rename

This doesn't mean it's impossible to support RENAME_NOREPLACE for these
filesystems, but it is not trivial, like for local filesystems.
RENAME_NOREPLACE must guarantee atomicity (i.e. it shouldn't be possible
for a file to be created on one host while it is overwritten by rename on
another host).

Filesystems converted:

9p, afs, ceph, coda, ecryptfs, kernfs, lustre, ncpfs, nfs, ocfs2, orangefs.

After this, we can get rid of the duplicate interfaces for rename.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: David Howells <dhowells@redhat.com> [AFS]
Acked-by: Mike Marshall <hubcap@omnibond.com>
Cc: Eric Van Hensbergen <ericvh@gmail.com>
Cc: Ilya Dryomov <idryomov@gmail.com>
Cc: Jan Harkes <jaharkes@cs.cmu.edu>
Cc: Tyler Hicks <tyhicks@canonical.com>
Cc: Oleg Drokin <oleg.drokin@intel.com>
Cc: Trond Myklebust <trond.myklebust@primarydata.com>
Cc: Mark Fasheh <mfasheh@suse.com>

fs/nfs/dir.c

@@ -2013,7 +2013,8 @@ EXPORT_SYMBOL_GPL(nfs_link);
  * the rename.
  */
 int nfs_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);
@@ -2021,6 +2022,9 @@ int nfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 	struct rpc_task *task;
 	int error = -EBUSY;
 
+	if (flags)
+		return -EINVAL;
+
 	dfprintk(VFS, "NFS: rename(%pd2 -> %pd2, ct=%d)\n",
 		 old_dentry, new_dentry,
 		 d_count(new_dentry));

fs/nfs/internal.h

@@ -359,7 +359,8 @@ int nfs_unlink(struct inode *, struct dentry *);
 int nfs_symlink(struct inode *, struct dentry *, const char *);
 int nfs_link(struct dentry *, struct inode *, struct dentry *);
 int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t);
-int nfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
+int nfs_rename(struct inode *, struct dentry *,
+	       struct inode *, struct dentry *, unsigned int);
 
 /* file.c */
 int nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync);

fs/nfs/nfs3proc.c

@@ -893,7 +893,7 @@ static const struct inode_operations nfs3_dir_inode_operations = {
 	.mkdir		= nfs_mkdir,
 	.rmdir		= nfs_rmdir,
 	.mknod		= nfs_mknod,
-	.rename		= nfs_rename,
+	.rename2	= nfs_rename,
 	.permission	= nfs_permission,
 	.getattr	= nfs_getattr,
 	.setattr	= nfs_setattr,

fs/nfs/nfs4proc.c

@@ -8937,7 +8937,7 @@ static const struct inode_operations nfs4_dir_inode_operations = {
 	.mkdir		= nfs_mkdir,
 	.rmdir		= nfs_rmdir,
 	.mknod		= nfs_mknod,
-	.rename		= nfs_rename,
+	.rename2	= nfs_rename,
 	.permission	= nfs_permission,
 	.getattr	= nfs_getattr,
 	.setattr	= nfs_setattr,

fs/nfs/proc.c

@@ -685,7 +685,7 @@ static const struct inode_operations nfs_dir_inode_operations = {
 	.mkdir		= nfs_mkdir,
 	.rmdir		= nfs_rmdir,
 	.mknod		= nfs_mknod,
-	.rename		= nfs_rename,
+	.rename2	= nfs_rename,
 	.permission	= nfs_permission,
 	.getattr	= nfs_getattr,
 	.setattr	= nfs_setattr,