[PATCH] Allow file systems to differentiate between data and meta reads

We can use this information for making more intelligent priority
decisions, and it will also be useful for blktrace.

Signed-off-by: Jens Axboe <axboe@suse.de>

1 files changed, 3 insertions, 0 deletions

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 5d8e288db163..2c01a90998a7 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -180,6 +180,7 @@ enum rq_flag_bits {
         __REQ_ORDERED_COLOR,    /* is before or after barrier */
         __REQ_RW_SYNC,          /* request is sync (O_DIRECT) */
         __REQ_ALLOCED,          /* request came from our alloc pool */
+        __REQ_RW_META,          /* metadata io request */
         __REQ_NR_BITS,          /* stops here */
 };
 
@@ -200,6 +201,7 @@ enum rq_flag_bits {
 #define REQ_ORDERED_COLOR       (1 << __REQ_ORDERED_COLOR)
 #define REQ_RW_SYNC     (1 << __REQ_RW_SYNC)
 #define REQ_ALLOCED     (1 << __REQ_ALLOCED)
+#define REQ_RW_META     (1 << __REQ_RW_META)
 
 #define BLK_MAX_CDB     16
 
@@ -543,6 +545,7 @@ enum {
  * We regard a request as sync, if it's a READ or a SYNC write.
  */
 #define rq_is_sync(rq)          (rq_data_dir((rq)) == READ || (rq)->cmd_flags & REQ_RW_SYNC)
+#define rq_is_meta(rq)          ((rq)->cmd_flags & REQ_RW_META)
 
 static inline int blk_queue_full(struct request_queue *q, int rw)
 {