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authorRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2009-11-14 00:09:47 +0900
committerRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2009-11-20 10:05:49 +0900
commitb34a65069caa56b691ebab5ae0b8e54d16406d16 (patch)
treef2eacf08be4471cd1ca781c9d4c56bbb81448531 /fs
parentef7d4757a5b7b07a3a0d30d3ba6b587e574b28b9 (diff)
downloadlinux-b34a65069caa56b691ebab5ae0b8e54d16406d16.tar.gz
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: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Diffstat (limited to 'fs')
-rw-r--r--fs/nilfs2/mdt.c28
1 files changed, 15 insertions, 13 deletions
diff --git a/fs/nilfs2/mdt.c b/fs/nilfs2/mdt.c
index 3028e8f31be..948b1f8bc50 100644
--- a/fs/nilfs2/mdt.c
+++ b/fs/nilfs2/mdt.c
@@ -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;
@@ -200,16 +200,18 @@ static int nilfs_mdt_read_block(struct inode *inode, unsigned long block,
if (unlikely(err))
goto failed;
- 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 */
-
- if (!buffer_locked(first_bh))
- goto out_no_wait;
+ 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 */
+ 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);