dm raid: move sectors_per_dev calculation

In preparation for RAID10 inclusion in dm-raid, we move the sectors_per_dev
calculation later in the device creation process.  This is because we won't
know up-front how many stripes vs how many mirrors there are which will
change the calculation.

Signed-off-by: Jonathan Brassow <jbrassow@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

1 files changed, 9 insertions, 9 deletions

diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c
index 1717ed33dd7f..f4275a8e860c 100644
--- a/drivers/md/dm-raid.c
+++ b/drivers/md/dm-raid.c
@@ -101,20 +101,12 @@ static struct raid_set *context_alloc(struct dm_target *ti, struct raid_type *ra
 {
         unsigned i;
         struct raid_set *rs;
-        sector_t sectors_per_dev;
 
         if (raid_devs <= raid_type->parity_devs) {
                 ti->error = "Insufficient number of devices";
                 return ERR_PTR(-EINVAL);
         }
 
-        sectors_per_dev = ti->len;
-        if ((raid_type->level > 1) &&
-            sector_div(sectors_per_dev, (raid_devs - raid_type->parity_devs))) {
-                ti->error = "Target length not divisible by number of data devices";
-                return ERR_PTR(-EINVAL);
-        }
-
         rs = kzalloc(sizeof(*rs) + raid_devs * sizeof(rs->dev[0]), GFP_KERNEL);
         if (!rs) {
                 ti->error = "Cannot allocate raid context";
@@ -128,7 +120,6 @@ static struct raid_set *context_alloc(struct dm_target *ti, struct raid_type *ra
         rs->md.raid_disks = raid_devs;
         rs->md.level = raid_type->level;
         rs->md.new_level = rs->md.level;
-        rs->md.dev_sectors = sectors_per_dev;
         rs->md.layout = raid_type->algorithm;
         rs->md.new_layout = rs->md.layout;
         rs->md.delta_disks = 0;
@@ -143,6 +134,7 @@ static struct raid_set *context_alloc(struct dm_target *ti, struct raid_type *ra
          *  rs->md.external
          *  rs->md.chunk_sectors
          *  rs->md.new_chunk_sectors
+         *  rs->md.dev_sectors
          */
 
         return rs;
@@ -353,6 +345,7 @@ static int parse_raid_params(struct raid_set *rs, char **argv,
 {
         unsigned i, rebuild_cnt = 0;
         unsigned long value, region_size = 0;
+        sector_t sectors_per_dev = rs->ti->len;
         sector_t max_io_len;
         char *key;
 
@@ -545,6 +538,13 @@ static int parse_raid_params(struct raid_set *rs, char **argv,
         if (dm_set_target_max_io_len(rs->ti, max_io_len))
                 return -EINVAL;
 
+        if ((rs->raid_type->level > 1) &&
+            sector_div(sectors_per_dev, (rs->md.raid_disks - rs->raid_type->parity_devs))) {
+                rs->ti->error = "Target length not divisible by number of data devices";
+                return -EINVAL;
+        }
+        rs->md.dev_sectors = sectors_per_dev;
+
         /* Assume there are no metadata devices until the drives are parsed */
         rs->md.persistent = 0;
         rs->md.external = 1;