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authorMartin K. Petersen <martin.petersen@oracle.com>2012-01-11 16:27:11 +0100
committerJens Axboe <axboe@kernel.dk>2012-01-11 16:27:11 +0100
commitb1bd055d397e09f99dcef9b138ed104ff1812fcb (patch)
treee8e1d3d0b6a33859392bcba516933aff256dc4b4 /drivers/md
parentc98b2cc29af8e84e7364b53e9bb4cc7cfaf62555 (diff)
downloadlinux-b1bd055d397e09f99dcef9b138ed104ff1812fcb.tar.bz2
block: Introduce blk_set_stacking_limits function
Stacking driver queue limits are typically bounded exclusively by the capabilities of the low level devices, not by the stacking driver itself. This patch introduces blk_set_stacking_limits() which has more liberal metrics than the default queue limits function. This allows us to inherit topology parameters from bottom devices without manually tweaking the default limits in each driver prior to calling the stacking function. Since there is now a clear distinction between stacking and low-level devices, blk_set_default_limits() has been modified to carry the more conservative values that we used to manually set in blk_queue_make_request(). Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Acked-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/dm-table.c6
-rw-r--r--drivers/md/md.c1
2 files changed, 4 insertions, 3 deletions
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 8e9132130142..63cc54289aff 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -699,7 +699,7 @@ static int validate_hardware_logical_block_alignment(struct dm_table *table,
while (i < dm_table_get_num_targets(table)) {
ti = dm_table_get_target(table, i++);
- blk_set_default_limits(&ti_limits);
+ blk_set_stacking_limits(&ti_limits);
/* combine all target devices' limits */
if (ti->type->iterate_devices)
@@ -1221,10 +1221,10 @@ int dm_calculate_queue_limits(struct dm_table *table,
struct queue_limits ti_limits;
unsigned i = 0;
- blk_set_default_limits(limits);
+ blk_set_stacking_limits(limits);
while (i < dm_table_get_num_targets(table)) {
- blk_set_default_limits(&ti_limits);
+ blk_set_stacking_limits(&ti_limits);
ti = dm_table_get_target(table, i++);
diff --git a/drivers/md/md.c b/drivers/md/md.c
index ee981737edfc..114ba155af87 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -4622,6 +4622,7 @@ static int md_alloc(dev_t dev, char *name)
mddev->queue->queuedata = mddev;
blk_queue_make_request(mddev->queue, md_make_request);
+ blk_set_stacking_limits(&mddev->queue->limits);
disk = alloc_disk(1 << shift);
if (!disk) {