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dm thin metadata: introduce THIN_MAX_CONCURRENT_LOCKS

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Introduce THIN_MAX_CONCURRENT_LOCKS into dm-thin-metadata to
give a name to an otherwise "magic" number.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Joe Thornber 2012-07-27 15:07:58 +01:00 committed by Alasdair G Kergon
parent d973ac196b
commit 8c971178a7
1 changed files with 8 additions and 6 deletions
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14
drivers/md/dm-thin-metadata.c
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@ -80,6 +80,12 @@
#define THIN_METADATA_CACHE_SIZE 64
#define SECTOR_TO_BLOCK_SHIFT 3
/*
* 3 for btree insert +
* 2 for btree lookup used within space map
*/
#define THIN_MAX_CONCURRENT_LOCKS 5
/* This should be plenty */
#define SPACE_MAP_ROOT_SIZE 128
@ -668,13 +674,9 @@ struct dm_pool_metadata *dm_pool_metadata_open(struct block_device *bdev,
return ERR_PTR(-ENOMEM);
}
/*
* Max hex locks:
* 3 for btree insert +
* 2 for btree lookup used within space map
*/
bm = dm_block_manager_create(bdev, THIN_METADATA_BLOCK_SIZE,
THIN_METADATA_CACHE_SIZE, 5);
THIN_METADATA_CACHE_SIZE,
THIN_MAX_CONCURRENT_LOCKS);
if (!bm) {
DMERR("could not create block manager");
kfree(pmd);