nilfs2: get rid of nilfs_mdt_mark_block_dirty()

nilfs_mdt_mark_block_dirty() can be replaced with primary functions
like nilfs_mdt_get_block() and mark_buffer_dirty(), and it's used only
by nilfs_ioctl_mark_blocks_dirty().

This gets rid of the function to simplify the interface of metadata
file.

Link: http://lkml.kernel.org/r/1461935747-10380-8-git-send-email-konishi.ryusuke@lab.ntt.co.jp
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/nilfs2/ioctl.c

@@ -779,6 +779,7 @@ static int nilfs_ioctl_mark_blocks_dirty(struct the_nilfs *nilfs,
 	size_t nmembs = argv->v_nmembs;
 	struct nilfs_bmap *bmap = NILFS_I(nilfs->ns_dat)->i_bmap;
 	struct nilfs_bdesc *bdescs = buf;
+	struct buffer_head *bh;
 	int ret, i;
 
 	for (i = 0; i < nmembs; i++) {
@@ -796,12 +797,16 @@ static int nilfs_ioctl_mark_blocks_dirty(struct the_nilfs *nilfs,
 			/* skip dead block */
 			continue;
 		if (bdescs[i].bd_level == 0) {
-			ret = nilfs_mdt_mark_block_dirty(nilfs->ns_dat,
-							 bdescs[i].bd_offset);
-			if (ret < 0) {
+			ret = nilfs_mdt_get_block(nilfs->ns_dat,
+						  bdescs[i].bd_offset,
+						  false, NULL, &bh);
+			if (unlikely(ret)) {
 				WARN_ON(ret == -ENOENT);
 				return ret;
 			}
+			mark_buffer_dirty(bh);
+			nilfs_mdt_mark_dirty(nilfs->ns_dat);
+			put_bh(bh);
 		} else {
 			ret = nilfs_bmap_mark(bmap, bdescs[i].bd_offset,
 					      bdescs[i].bd_level);

fs/nilfs2/mdt.c

@@ -389,34 +389,6 @@ int nilfs_mdt_forget_block(struct inode *inode, unsigned long block)
 	return ret;
 }
 
-/**
- * nilfs_mdt_mark_block_dirty - mark a block on the meta data file dirty.
- * @inode: inode of the meta data file
- * @block: block offset
- *
- * Return Value: On success, it returns 0. On error, the following negative
- * error code is returned.
- *
- * %-ENOMEM - Insufficient memory available.
- *
- * %-EIO - I/O error
- *
- * %-ENOENT - the specified block does not exist (hole block)
- */
-int nilfs_mdt_mark_block_dirty(struct inode *inode, unsigned long block)
-{
-	struct buffer_head *bh;
-	int err;
-
-	err = nilfs_mdt_read_block(inode, block, 0, &bh);
-	if (unlikely(err))
-		return err;
-	mark_buffer_dirty(bh);
-	nilfs_mdt_mark_dirty(inode);
-	brelse(bh);
-	return 0;
-}
-
 int nilfs_mdt_fetch_dirty(struct inode *inode)
 {
 	struct nilfs_inode_info *ii = NILFS_I(inode);

fs/nilfs2/mdt.h

@@ -79,7 +79,6 @@ int nilfs_mdt_find_block(struct inode *inode, unsigned long start,
 			 struct buffer_head **out_bh);
 int nilfs_mdt_delete_block(struct inode *, unsigned long);
 int nilfs_mdt_forget_block(struct inode *, unsigned long);
-int nilfs_mdt_mark_block_dirty(struct inode *, unsigned long);
 int nilfs_mdt_fetch_dirty(struct inode *);
 
 int nilfs_mdt_init(struct inode *inode, gfp_t gfp_mask, size_t objsz);