From: Heinz Mauelshagen <heinzm@xxxxxxxxxx>
Signed-off-by: Heinz Mauelshagen <heinzm@xxxxxxxxxx>
---
drivers/md/dm-raid.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c
index 0eceee8..a382985 100644
--- a/drivers/md/dm-raid.c
+++ b/drivers/md/dm-raid.c
@@ -1025,7 +1025,7 @@ static int parse_raid_params(struct raid_set *rs, struct dm_arg_set *as,
{
int value, raid10_format = ALGORITHM_RAID10_DEFAULT;
unsigned raid10_copies = 2;
- unsigned i;
+ unsigned i, write_mostly = 0;
unsigned region_size = 0;
sector_t max_io_len;
const char *arg, *key;
@@ -1179,6 +1179,7 @@ static int parse_raid_params(struct raid_set *rs, struct dm_arg_set *as,
return -EINVAL;
}
+ write_mostly++;
set_bit(WriteMostly, &rs->dev[value].rdev.flags);
set_bit(__CTR_FLAG_WRITE_MOSTLY, &rs->ctr_flags);
} else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_MAX_WRITE_BEHIND))) {
@@ -1303,6 +1304,11 @@ static int parse_raid_params(struct raid_set *rs, struct dm_arg_set *as,
return -EINVAL;
}
+ if (write_mostly >= rs->md.raid_disks) {
+ rs->ti->error = "Can't set all raid1 devices to write_mostly";
+ return -EINVAL;
+ }
+
if (validate_region_size(rs, region_size))
return -EINVAL;
--
2.5.5
--
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