[PATCH] blktrace: readahead support

Provide the needed kernel support for distinguishing readahead
from regular read requests when tracing block devices.

Signed-off-by: Nathan Scott <nathans@sgi.com>
Signed-off-by: Jens Axboe <axboe@suse.de>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/linux/blktrace_api.h b/include/linux/blktrace_api.h
index d95615fc6da5..2346a1db8561 100644
--- a/include/linux/blktrace_api.h
+++ b/include/linux/blktrace_api.h
@@ -19,6 +19,7 @@ enum blktrace_cat {
         BLK_TC_FS       = 1 << 8,       /* fs requests */
         BLK_TC_PC       = 1 << 9,       /* pc requests */
         BLK_TC_NOTIFY   = 1 << 10,      /* special message */
+        BLK_TC_AHEAD    = 1 << 11,      /* readahead */
 
         BLK_TC_END      = 1 << 15,      /* only 16-bits, reminder */
 };