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| author | Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> | 2009-11-14 00:09:47 +0900 |
|---|---|---|
| committer | Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> | 2009-11-20 10:05:49 +0900 |
| commit | b34a65069caa56b691ebab5ae0b8e54d16406d16 (patch) | |
| tree | f2eacf08be4471cd1ca781c9d4c56bbb81448531 /fs/nilfs2/mdt.c | |
| parent | ef7d4757a5b7b07a3a0d30d3ba6b587e574b28b9 (diff) | |
| download | linux-b34a65069caa56b691ebab5ae0b8e54d16406d16.tar.gz linux-b34a65069caa56b691ebab5ae0b8e54d16406d16.tar.bz2 linux-b34a65069caa56b691ebab5ae0b8e54d16406d16.zip | |
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/nilfs2/mdt.c')
| -rw-r--r-- | fs/nilfs2/mdt.c | 28 |
1 files changed, 15 insertions, 13 deletions
diff --git a/fs/nilfs2/mdt.c b/fs/nilfs2/mdt.c index 3028e8f31be2..948b1f8bc505 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); |