xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

dm thin: generate event when metadata threshold passed

Browse Source 
Generate a dm event when the amount of remaining thin pool metadata
space falls below a certain level.

The threshold is taken to be a quarter of the size of the metadata
device with a minimum threshold of 4MB.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Joe Thornber
2013-05-10 14:37:21 +01:00
committed by Alasdair G Kergon
parent 2fc48021f4
commit ac8c3f3df6
3 changed files with 58 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
drivers/md/dm-thin-metadata.c
View File

@@ -1696,3 +1696,17 @@ void dm_pool_metadata_read_only(struct dm_pool_metadata *pmd)
dm_bm_set_read_only(pmd->bm);
up_write(&pmd->root_lock);
}
int dm_pool_register_metadata_threshold(struct dm_pool_metadata *pmd,
dm_block_t threshold,
dm_sm_threshold_fn fn,
void *context)
{
int r;
down_write(&pmd->root_lock);
r = dm_sm_register_threshold_callback(pmd->metadata_sm, threshold, fn, context);
up_write(&pmd->root_lock);
return r;
}