From: Evan Green <evgreen@chromium.org>
Date: Mon, 2 Jul 2018 23:03:46 +0000 (-0700)
Subject: UPSTREAM: loop: Add LOOP_SET_BLOCK_SIZE in compat ioctl
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=4f67cea4b62fdb13b2aedb8fd679b3a0e529991e;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git

UPSTREAM: loop: Add LOOP_SET_BLOCK_SIZE in compat ioctl

This change adds LOOP_SET_BLOCK_SIZE as one of the supported ioctls
in lo_compat_ioctl. It only takes an unsigned long argument, and
in practice a 32-bit value works fine.

Bug: 117823094
Change-Id: I0061a082eb2632c47b7d66f35f2c909d33ff1653
Reviewed-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Evan Green <evgreen@chromium.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
(cherry picked from commit 9fea4b395260175de4016b42982f45a3e6e03d0b)
Signed-off-by: Martijn Coenen <maco@android.com>
---

diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 369ca34f46d7..9c7905f47105 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -1568,6 +1568,7 @@ static int lo_compat_ioctl(struct block_device *bdev, fmode_t mode,
 		arg = (unsigned long) compat_ptr(arg);
 	case LOOP_SET_FD:
 	case LOOP_CHANGE_FD:
+	case LOOP_SET_BLOCK_SIZE:
 		err = lo_ioctl(bdev, mode, cmd, arg);
 		break;
 	default: