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| author | NeilBrown <neilb@suse.de> | 2012-03-19 12:46:39 +1100 |
|---|---|---|
| committer | NeilBrown <neilb@suse.de> | 2012-03-19 12:46:39 +1100 |
| commit | ba13da47ffa202784355561f72160a41350e95cc (patch) | |
| tree | 9b60f27ab89e4036df65d0dc3bf52b7420f83a50 /drivers/md/raid0.h | |
| parent | dafb20fa34320a472deb7442f25a0c086e0feb33 (diff) | |
| download | lwn-ba13da47ffa202784355561f72160a41350e95cc.tar.gz lwn-ba13da47ffa202784355561f72160a41350e95cc.zip | |
md: add proper merge_bvec handling to RAID0 and Linear.
These personalities currently set a max request size of one page
when any member device has a merge_bvec_fn because they don't
bother to call that function.
This causes extra works in splitting and combining requests.
So make the extra effort to call the merge_bvec_fn when it exists
so that we end up with larger requests out the bottom.
Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'drivers/md/raid0.h')
| -rw-r--r-- | drivers/md/raid0.h | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/drivers/md/raid0.h b/drivers/md/raid0.h index 0884bba8df4c..05539d9c97f0 100644 --- a/drivers/md/raid0.h +++ b/drivers/md/raid0.h @@ -4,13 +4,16 @@ struct strip_zone { sector_t zone_end; /* Start of the next zone (in sectors) */ sector_t dev_start; /* Zone offset in real dev (in sectors) */ - int nb_dev; /* # of devices attached to the zone */ + int nb_dev; /* # of devices attached to the zone */ }; struct r0conf { - struct strip_zone *strip_zone; - struct md_rdev **devlist; /* lists of rdevs, pointed to by strip_zone->dev */ - int nr_strip_zones; + struct strip_zone *strip_zone; + struct md_rdev **devlist; /* lists of rdevs, pointed to + * by strip_zone->dev */ + int nr_strip_zones; + int has_merge_bvec; /* at least one member has + * a merge_bvec_fn */ }; #endif |