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Commit b34a6506 authored by Ryusuke Konishi's avatar Ryusuke Konishi
Browse files

nilfs2: avoid readahead on metadata file for create mode 



This turns off readhead action of metadata file if nilfs_mdt_get_block
function was called with a create flag.

Signed-off-by: default avatarRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
parent ef7d4757

fs/nilfs2/mdt.c

+15 −13
Original line number Diff line number Diff line
@@ -186,7 +186,7 @@ nilfs_mdt_submit_block(struct inode *inode, unsigned long blkoff, 
}



static int nilfs_mdt_read_block(struct inode *inode, unsigned long block,

				struct buffer_head **out_bh)

				int readahead, struct buffer_head **out_bh)

{

	struct buffer_head *first_bh, *bh;

	unsigned long blkoff;
@@ -200,17 +200,19 @@ static int nilfs_mdt_read_block(struct inode *inode, unsigned long block, 
	if (unlikely(err))

		goto failed;



	if (readahead) {

		blkoff = block + 1;

		for (i = 0; i < nr_ra_blocks; i++, blkoff++) {

			err = nilfs_mdt_submit_block(inode, blkoff, READA, &bh);

			if (likely(!err || err == -EEXIST))

				brelse(bh);

			else if (err != -EBUSY)

			break; /* abort readahead if bmap lookup failed */



				break;

				/* abort readahead if bmap lookup failed */

			if (!buffer_locked(first_bh))

				goto out_no_wait;

		}

	}



	wait_on_buffer(first_bh);
@@ -263,7 +265,7 @@ int nilfs_mdt_get_block(struct inode *inode, unsigned long blkoff, int create, 


	/* Should be rewritten with merging nilfs_mdt_read_block() */

 retry:

	ret = nilfs_mdt_read_block(inode, blkoff, out_bh);

	ret = nilfs_mdt_read_block(inode, blkoff, !create, out_bh);

	if (!create || ret != -ENOENT)

		return ret;
@@ -371,7 +373,7 @@ 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, &bh);

	err = nilfs_mdt_read_block(inode, block, 0, &bh);

	if (unlikely(err))

		return err;

	nilfs_mark_buffer_dirty(bh);