This is a note to let you know that I've just added the patch titled
aio: protect reqs_available updates from changes in interrupt handlers
to the 3.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
aio-protect-reqs_available-updates-from-changes-in-interrupt-handlers.patch
and it can be found in the queue-3.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 263782c1c95bbddbb022dc092fd89a36bb8d5577 Mon Sep 17 00:00:00 2001
From: Benjamin LaHaise <bcrl@xxxxxxxxx>
Date: Mon, 14 Jul 2014 12:49:26 -0400
Subject: aio: protect reqs_available updates from changes in interrupt handlers
From: Benjamin LaHaise <bcrl@xxxxxxxxx>
commit 263782c1c95bbddbb022dc092fd89a36bb8d5577 upstream.
As of commit f8567a3845ac05bb28f3c1b478ef752762bd39ef it is now possible to
have put_reqs_available() called from irq context. While put_reqs_available()
is per cpu, it did not protect itself from interrupts on the same CPU. This
lead to aio_complete() corrupting the available io requests count when run
under a heavy O_DIRECT workloads as reported by Robert Elliott. Fix this by
disabling irq updates around the per cpu batch updates of reqs_available.
Many thanks to Robert and folks for testing and tracking this down.
Reported-by: Robert Elliot <Elliott@xxxxxx>
Tested-by: Robert Elliot <Elliott@xxxxxx>
Signed-off-by: Benjamin LaHaise <bcrl@xxxxxxxxx>
Cc: Jens Axboe <axboe@xxxxxxxxx>, Christoph Hellwig <hch@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/aio.c | 7 +++++++
1 file changed, 7 insertions(+)
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -830,16 +830,20 @@ void exit_aio(struct mm_struct *mm)
static void put_reqs_available(struct kioctx *ctx, unsigned nr)
{
struct kioctx_cpu *kcpu;
+ unsigned long flags;
preempt_disable();
kcpu = this_cpu_ptr(ctx->cpu);
+ local_irq_save(flags);
kcpu->reqs_available += nr;
+
while (kcpu->reqs_available >= ctx->req_batch * 2) {
kcpu->reqs_available -= ctx->req_batch;
atomic_add(ctx->req_batch, &ctx->reqs_available);
}
+ local_irq_restore(flags);
preempt_enable();
}
@@ -847,10 +851,12 @@ static bool get_reqs_available(struct ki
{
struct kioctx_cpu *kcpu;
bool ret = false;
+ unsigned long flags;
preempt_disable();
kcpu = this_cpu_ptr(ctx->cpu);
+ local_irq_save(flags);
if (!kcpu->reqs_available) {
int old, avail = atomic_read(&ctx->reqs_available);
@@ -869,6 +875,7 @@ static bool get_reqs_available(struct ki
ret = true;
kcpu->reqs_available--;
out:
+ local_irq_restore(flags);
preempt_enable();
return ret;
}
Patches currently in stable-queue which might be from bcrl@xxxxxxxxx are
queue-3.15/aio-protect-reqs_available-updates-from-changes-in-interrupt-handlers.patch
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