From: Bintian Wang <bintian.wang@linaro.org>
Date: Sun, 30 Jun 2013 12:34:24 +0000 (+0800)
Subject: Add compat_ioctl support for VFAT_IOCTL_GET_VOLUME_ID
X-Git-Tag: firefly_0821_release~4090^2~501
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=79245d37165aad2e57b1919defdd124639ddf55a;p=firefly-linux-kernel-4.4.55.git

Add compat_ioctl support for VFAT_IOCTL_GET_VOLUME_ID

Add VFAT_IOCTL_GET_VOLUME_ID to vfat dir compat_ioctl() interface,
which enable you read vfat volume ID from a 32bit app on a 64bit
kernel

Change-Id: I3e93dfcc1e7a364a6b11bc7e3f5f210e82f306ed
Signed-off-by: Bintian Wang <bintian.wang@linaro.org>
Signed-off-by: John Stultz <john.stultz@linaro.org>
---

diff --git a/fs/fat/dir.c b/fs/fat/dir.c
index ddfa4529e6ea..4b775e606fc8 100644
--- a/fs/fat/dir.c
+++ b/fs/fat/dir.c
@@ -841,6 +841,8 @@ static long fat_compat_dir_ioctl(struct file *filp, unsigned cmd,
 		short_only = 0;
 		both = 1;
 		break;
+	case VFAT_IOCTL_GET_VOLUME_ID:
+		return fat_ioctl_volume_id(inode);
 	default:
 		return fat_generic_ioctl(filp, cmd, (unsigned long)arg);
 	}