[PATCH] read-ahead and failfast

Here's the patch to enable failfast flag in the bio submission code, and
use it for multipath and readahead.

1 files changed, 1 insertions, 0 deletions

diff --git a/include/linux/sched.h b/include/linux/sched.h
index bf740af246c0..b20db4e5fbfa 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -487,6 +487,7 @@ do { if (atomic_dec_and_test(&(tsk)->usage)) __put_task_struct(tsk); } while(0)
 #define PF_SWAPOFF	0x00080000	/* I am in swapoff */
 #define PF_LESS_THROTTLE 0x01000000	/* Throttle me less: I clena memory */
 #define PF_SYNCWRITE	0x00200000	/* I am doing a sync write */
+#define PF_READAHEAD	0x00400000	/* I am doing read-ahead */
 
 #ifdef CONFIG_SMP
 extern int set_cpus_allowed(task_t *p, unsigned long new_mask);