X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=drivers%2Fmd%2Fdm-snap.h;h=292c15609ae362fc344a9c46811285319a3f1bec;hb=04489eeb02a40bc15029886cef7285ada3ab0de6;hp=24f9fb73b982d0cd148ef15d56428ba6c7ce6877;hpb=bc84e0a160e383deb56568f4e03bc51b1ce16775;p=linux-2.6

diff --git a/drivers/md/dm-snap.h b/drivers/md/dm-snap.h
index 24f9fb73b9..292c15609a 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;
@@ -157,6 +161,8 @@ struct dm_snapshot {
 	/* The last percentage we notified */
 	int last_percent;
 
+	mempool_t *pending_pool;
+
 	struct exception_table pending;
 	struct exception_table complete;
 
@@ -174,6 +180,11 @@ 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];
 };
 
 /*