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Btrfs: do not async submit for nodatasum inodes

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While we submit direct writes, if the inode is flagged with nodatasum,
there's no benefit to submit asynchronously, because

a) we don't have to calculate checksum across processors,

b) and direct IO has started a plug, but async submit makes us queue
IO on each device's scheduled IO list instead of DIO's plug list, so
that IOs get much less merges in general.

Lets use sync submit for nodatasum inodes.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Liu Bo 2017-08-18 11:54:02 -06:00 committed by David Sterba
parent 9cd3a7eb85
commit 9b4a9b283d
1 changed files with 1 additions and 1 deletions
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2
fs/btrfs/inode.c
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@ -8577,7 +8577,7 @@ __btrfs_submit_dio_bio(struct bio *bio, struct inode *inode, u64 file_offset,
goto err;
}
map:
ret = btrfs_map_bio(fs_info, bio, 0, async_submit);
ret = btrfs_map_bio(fs_info, bio, 0, 0);
err:
bio_put(bio);
return ret;