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: DM RAID: Move 'sectors_per_dev' calculation

PATCH Superseded Jonathan Brassow 2 participants 3 messages Jun 26, 2012 – Jul 4, 2012 Device mapper

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Jonathan Brassow

author
#0 lore raw

PATCH 1/1 : DM RAID: Move 'sectors_per_dev' calculation

dm-raid: Move sectors_per_dev calculation later in the device creation process

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 <[email protected]>
drivers/md/dm-raid.c +9 -9
Index: linux-upstream/drivers/md/dm-raid.c
===================================================================
@@ -101,20 +101,12 @@ static struct raid_set *context_alloc(st
 {
 	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(st
 	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(st
 	 *  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
 {
 	unsigned i, rebuild_cnt = 0;
 	unsigned long value, region_size = 0;
+	sector_t sectors_per_dev = rs->ti->len;
 	char *key;
 
 	/*

@@ -526,6 +519,13 @@ static int parse_raid_params(struct raid
 	else
 		rs->ti->split_io = region_size;
 
+	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;
author
#1 lore raw

PATCH v2 1/1 : DM RAID: Move 'sectors_per_dev' calculation

Version 2 in response to conflicts found with existing patches in linux-next.

brassow

dm-raid: Move sectors_per_dev calculation later in the device creation process

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 <[email protected]>
drivers/md/dm-raid.c +9 -9
Index: linux-upstream/drivers/md/dm-raid.c
===================================================================
@@ -101,20 +101,12 @@ static struct raid_set *context_alloc(st
 {
 	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(st
 	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(st
 	 *  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
 {
 	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;
 

@@ -530,6 +523,13 @@ static int parse_raid_params(struct raid
 	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;