block: Implement support for WRITE SAME

[mirror_ubuntu-artful-kernel.git] / include / linux / blk_types.h

diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
index 3eefbb2911922b6f0e28d8bdd72b362ed376913d..cdf11191e6450fa680b7a8b71352c3642633b9fb 100644 (file)
--- a/include/linux/blk_types.h
+++ b/include/linux/blk_types.h
@@ -147,6 +147,7 @@ enum rq_flag_bits {
        __REQ_PRIO,             /* boost priority in cfq */
        __REQ_DISCARD,          /* request to discard sectors */
        __REQ_SECURE,           /* secure discard (used with __REQ_DISCARD) */
+       __REQ_WRITE_SAME,       /* write same block many times */
 
        __REQ_NOIDLE,           /* don't anticipate more IO after this one */
        __REQ_FUA,              /* forced unit access */
@@ -185,15 +186,21 @@ enum rq_flag_bits {
 #define REQ_META               (1 << __REQ_META)
 #define REQ_PRIO               (1 << __REQ_PRIO)
 #define REQ_DISCARD            (1 << __REQ_DISCARD)
+#define REQ_WRITE_SAME         (1 << __REQ_WRITE_SAME)
 #define REQ_NOIDLE             (1 << __REQ_NOIDLE)
 
 #define REQ_FAILFAST_MASK \
        (REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | REQ_FAILFAST_DRIVER)
 #define REQ_COMMON_MASK \
        (REQ_WRITE | REQ_FAILFAST_MASK | REQ_SYNC | REQ_META | REQ_PRIO | \
-        REQ_DISCARD | REQ_NOIDLE | REQ_FLUSH | REQ_FUA | REQ_SECURE)
+        REQ_DISCARD | REQ_WRITE_SAME | REQ_NOIDLE | REQ_FLUSH | REQ_FUA | \
+        REQ_SECURE)
 #define REQ_CLONE_MASK         REQ_COMMON_MASK
 
+/* This mask is used for both bio and request merge checking */
+#define REQ_NOMERGE_FLAGS \
+       (REQ_NOMERGE | REQ_STARTED | REQ_SOFTBARRIER | REQ_FLUSH | REQ_FUA)
+
 #define REQ_RAHEAD             (1 << __REQ_RAHEAD)
 #define REQ_THROTTLED          (1 << __REQ_THROTTLED)