diff options
Diffstat (limited to 'drivers/md/dm-snap.h')
| -rw-r--r-- | drivers/md/dm-snap.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/md/dm-snap.h b/drivers/md/dm-snap.h index 24f9fb73b98..70dc961f40d 100644 --- a/drivers/md/dm-snap.h +++ b/drivers/md/dm-snap.h @@ -130,6 +130,10 @@ struct exception_store { void *context; }; +#define DM_TRACKED_CHUNK_HASH_SIZE 16 +#define DM_TRACKED_CHUNK_HASH(x) ((unsigned long)(x) & \ + (DM_TRACKED_CHUNK_HASH_SIZE - 1)) + struct dm_snapshot { struct rw_semaphore lock; struct dm_target *ti; @@ -174,6 +178,11 @@ struct dm_snapshot { /* Queue of snapshot writes for ksnapd to flush */ struct bio_list queued_bios; struct work_struct queued_bios_work; + + /* Chunks with outstanding reads */ + mempool_t *tracked_chunk_pool; + spinlock_t tracked_chunk_lock; + struct hlist_head tracked_chunk_hash[DM_TRACKED_CHUNK_HASH_SIZE]; }; /* |