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authorMike Snitzer <snitzer@redhat.com>2012-07-27 15:08:00 +0100
committerAlasdair G Kergon <agk@redhat.com>2012-07-27 15:08:00 +0100
commit542f90381422676544382d4071ba44a2de90a0c1 (patch)
tree0eae6798ab2fdef68a0eb1ea5ac14f3cc3ffb740 /drivers/md/dm-raid.c
parent1df05483d758ea43abc375869fbe06be506ba827 (diff)
dm: support non power of two target max_io_len
Remove the restriction that limits a target's specified maximum incoming I/O size to be a power of 2. Rename this setting from 'split_io' to the less-ambiguous 'max_io_len'. Change it from sector_t to uint32_t, which is plenty big enough, and introduce a wrapper function dm_set_target_max_io_len() to set it. Use sector_div() to process it now that it is not necessarily a power of 2. Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'drivers/md/dm-raid.c')
-rw-r--r--drivers/md/dm-raid.c11
1 files changed, 5 insertions, 6 deletions
diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c
index 017c34d78d61..858a8b70811c 100644
--- a/drivers/md/dm-raid.c
+++ b/drivers/md/dm-raid.c
@@ -353,6 +353,7 @@ static int parse_raid_params(struct raid_set *rs, char **argv,
{
unsigned i, rebuild_cnt = 0;
unsigned long value, region_size = 0;
+ sector_t max_io_len;
char *key;
/*
@@ -522,14 +523,12 @@ static int parse_raid_params(struct raid_set *rs, char **argv,
return -EINVAL;
if (rs->md.chunk_sectors)
- rs->ti->split_io = rs->md.chunk_sectors;
+ max_io_len = rs->md.chunk_sectors;
else
- rs->ti->split_io = region_size;
+ max_io_len = region_size;
- if (rs->md.chunk_sectors)
- rs->ti->split_io = rs->md.chunk_sectors;
- else
- rs->ti->split_io = region_size;
+ if (dm_set_target_max_io_len(rs->ti, max_io_len))
+ return -EINVAL;
/* Assume there are no metadata devices until the drives are parsed */
rs->md.persistent = 0;