From: Evan Green <evgreen@chromium.org>
Date: Mon, 2 Jul 2018 23:03:46 +0000 (-0700)
Subject: loop: Add LOOP_SET_BLOCK_SIZE in compat ioctl
X-Git-Tag: v4.18-rc4~15^2
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=9fea4b395260175de4016b42982f45a3e6e03d0b;p=users%2Fdwmw2%2Flinux.git

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.

Reviewed-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Evan Green <evgreen@chromium.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---

diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 21e6d1b3b3934..258355c5a93a1 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -1612,6 +1612,7 @@ 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: