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md: add proper merge_bvec handling to RAID0 and Linear.

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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>
This commit is contained in:
NeilBrown
2012-03-19 12:46:39 +11:00
parent dafb20fa34
commit ba13da47ff
3 changed files with 107 additions and 88 deletions
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11
drivers/md/raid0.h
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@@ -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