dquot: cleanup dquot drop routine

Get rid of the drop dquot operation - it is now always called from
the filesystem and if a filesystem really needs it's own (which none
currently does) it can just call into it's own routine directly.

Rename the now static low-level dquot_drop helper to __dquot_drop
and vfs_dq_drop to dquot_drop to have a consistent namespace.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jan Kara <jack@suse.cz>

fs/ext3/ialloc.c

@@ -126,7 +126,7 @@ void ext3_free_inode (handle_t *handle, struct inode * inode)
 	vfs_dq_init(inode);
 	ext3_xattr_delete_inode(handle, inode);
 	dquot_free_inode(inode);
-	vfs_dq_drop(inode);
+	dquot_drop(inode);
 
 	is_directory = S_ISDIR(inode->i_mode);
 
@@ -622,7 +622,7 @@ fail_free_drop:
 	dquot_free_inode(inode);
 
 fail_drop:
-	vfs_dq_drop(inode);
+	dquot_drop(inode);
 	inode->i_flags |= S_NOQUOTA;
 	inode->i_nlink = 0;
 	unlock_new_inode(inode);

fs/ext3/super.c

@@ -529,7 +529,7 @@ static void ext3_clear_inode(struct inode *inode)
 {
 	struct ext3_block_alloc_info *rsv = EXT3_I(inode)->i_block_alloc_info;
 
-	vfs_dq_drop(inode);
+	dquot_drop(inode);
 	ext3_discard_reservation(inode);
 	EXT3_I(inode)->i_block_alloc_info = NULL;
 	if (unlikely(rsv))
@@ -753,7 +753,6 @@ static ssize_t ext3_quota_write(struct super_block *sb, int type,
 
 static const struct dquot_operations ext3_quota_operations = {
 	.initialize	= dquot_initialize,
-	.drop		= dquot_drop,
 	.write_dquot	= ext3_write_dquot,
 	.acquire_dquot	= ext3_acquire_dquot,
 	.release_dquot	= ext3_release_dquot,