leandrof/linux
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

dm snapshot: Make exception tables scalable

Browse Source 
Use list_bl to implement the exception hash tables' buckets. This change
permits concurrent access, to distinct buckets, by multiple threads.

Also, implement helper functions to lock and unlock the exception tables
based on the chunk number of the exception at hand.

We retain the global locking, by means of down_write(), which is
replaced by the next commit.

Still, we must acquire the per-bucket spinlocks when accessing the hash
tables, since list_bl does not allow modification on unlocked lists.

Co-developed-by: Ilias Tsitsimpis <iliastsi@arrikto.com>
Signed-off-by: Nikos Tsironis <ntsironis@arrikto.com>
Acked-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Nikos Tsironis
2019-03-17 14:22:57 +02:00
committed by Mike Snitzer
parent 4ad8d880b6
commit f79ae415b6
2 changed files with 116 additions and 24 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/md/dm-exception-store.h
View File

@@ -11,6 +11,7 @@
#define _LINUX_DM_EXCEPTION_STORE
#include <linux/blkdev.h>
#include <linux/list_bl.h>
#include <linux/device-mapper.h>
/*
@@ -27,7 +28,7 @@ typedef sector_t chunk_t;
* chunk within the device.
*/
struct dm_exception {
struct list_head hash_list;
struct hlist_bl_node hash_list;
chunk_t old_chunk;
chunk_t new_chunk;