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Go Back   Linux Archive > Redhat > Device-mapper Development

 
 
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Old 07-09-2012, 02:14 PM
Mike Snitzer
 
Default block: do not artificially constrain max_sectors for stacking drivers

blk_set_stacking_limits is intended to allow stacking drivers to build
up the limits of the stacked device based on the underlying devices'
limits. But in the case of 'max_sectors' the default of
BLK_DEF_MAX_SECTORS (1024) doesn't allow the stacking driver to inherit
a max_sectors larger than 1024.

It is now clear that this artificial limit is getting in the way so
change blk_set_stacking_limits's max_sectors to UINT_MAX (which allows
stacking drivers like dm-multipath to inherit 'max_sectors' from the
underlying paths).

Reported-by: Vijay Chauhan <vijay.chauhan@netapp.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
---
block/blk-settings.c | 3 +--
1 files changed, 1 insertions(+), 2 deletions(-)

diff --git a/block/blk-settings.c b/block/blk-settings.c
index d3234fc..565a678 100644
--- a/block/blk-settings.c
+++ b/block/blk-settings.c
@@ -143,8 +143,7 @@ void blk_set_stacking_limits(struct queue_limits *lim)
lim->discard_zeroes_data = 1;
lim->max_segments = USHRT_MAX;
lim->max_hw_sectors = UINT_MAX;
-
- lim->max_sectors = BLK_DEF_MAX_SECTORS;
+ lim->max_sectors = UINT_MAX;
}
EXPORT_SYMBOL(blk_set_stacking_limits);


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