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dm table: establish queue limits by copying table limits 

Copy the table's queue_limits to the DM device's request_queue.  This
properly initializes the queue's topology limits and also avoids having
to track the evolution of 'struct queue_limits' in
dm_table_set_restrictions()

Also fixes a bug that was introduced in dm_table_set_restrictions() via
commit ae03bf639a.  In addition to
establishing 'bounce_pfn' in the queue's limits blk_queue_bounce_limit()
also performs an allocation to setup the ISA DMA pool.  This allocation
resulted in "sleeping function called from invalid context" when called
from dm_table_set_restrictions().

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Mike Snitzer 2009-06-22 10:12:32 +01:00 committed by Alasdair G Kergon
parent 5ab97588fb
commit 1197764e40
1 changed files with 2 additions and 10 deletions
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12
drivers/md/dm-table.c
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@ -956,17 +956,9 @@ static void dm_table_set_integrity(struct dm_table *t)
void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q)
{
/*
* Make sure we obey the optimistic sub devices
* restrictions.
* Copy table's limits to the DM device's request_queue
*/
blk_queue_max_sectors(q, t->limits.max_sectors);
blk_queue_max_phys_segments(q, t->limits.max_phys_segments);
blk_queue_max_hw_segments(q, t->limits.max_hw_segments);
blk_queue_logical_block_size(q, t->limits.logical_block_size);
blk_queue_max_segment_size(q, t->limits.max_segment_size);
blk_queue_max_hw_sectors(q, t->limits.max_hw_sectors);
blk_queue_segment_boundary(q, t->limits.seg_boundary_mask);
blk_queue_bounce_limit(q, t->limits.bounce_pfn);
q->limits = t->limits;
if (t->limits.no_cluster)
queue_flag_clear_unlocked(QUEUE_FLAG_CLUSTER, q);