[PATCH] block layer: ioprio_best function fix

Currently ioprio_best function first checks wethere aioprio or bioprio equals
IOPRIO_CLASS_NONE (ioprio_valid() macros does that) and if it is so it returns
bioprio/aioprio appropriately. Thus the next four lines, that set aclass/bclass
to IOPRIO_CLASS_BE, if aclass/bclass == IOPRIO_CLASS_NONE, are never executed.

The second problem: if aioprio from class IOPRIO_CLASS_NONE and bioprio from
class IOPRIO_CLASS_IDLE are passed to ioprio_best function, it will return
IOPRIO_CLASS_IDLE. It means that during __make_request we can merge two
requests and set the priority of merged request to IDLE, while one of
the initial requests originates from a process with NONE (default) priority.
So we can get a situation when a process with default ioprio will experience
IO starvation, while there is no process from real-time class in the system.

Just removing ioprio_valid check should correct situation.

Signed-off-by: Vasily Tarasov <vtaras@openvz.org>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

1 files changed, 0 insertions, 5 deletions

diff --git a/fs/ioprio.c b/fs/ioprio.c
index 6dc6721d9e82..89e8da112a75 100644
--- a/fs/ioprio.c
+++ b/fs/ioprio.c
@@ -150,11 +150,6 @@ int ioprio_best(unsigned short aprio, unsigned short bprio)
         unsigned short aclass = IOPRIO_PRIO_CLASS(aprio);
         unsigned short bclass = IOPRIO_PRIO_CLASS(bprio);
 
-        if (!ioprio_valid(aprio))
-                return bprio;
-        if (!ioprio_valid(bprio))
-                return aprio;
-
         if (aclass == IOPRIO_CLASS_NONE)
                 aclass = IOPRIO_CLASS_BE;
         if (bclass == IOPRIO_CLASS_NONE)