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authorThomas Bächler <thomas@archlinux.org>2014-04-03 23:55:37 +0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-04-16 22:53:08 +0400
commita2a4dc494a7b7135f460e38e788c4a58f65e4ac3 (patch)
tree8b593307370f6e4ade7630be2a1e66eb2770e745 /fs/super.c
parentc9eaa447e77efe77b7fa4c953bd62de8297fd6c5 (diff)
downloadlinux-a2a4dc494a7b7135f460e38e788c4a58f65e4ac3.tar.xz
fs: Don't return 0 from get_anon_bdev
Commit 9e30cc9595303b27b48 removed an internal mount. This has the side-effect that rootfs now has FSID 0. Many userspace utilities assume that st_dev in struct stat is never 0, so this change breaks a number of tools in early userspace. Since we don't know how many userspace programs are affected, make sure that FSID is at least 1. References: http://article.gmane.org/gmane.linux.kernel/1666905 References: http://permalink.gmane.org/gmane.linux.utilities.util-linux-ng/8557 Cc: 3.14 <stable@vger.kernel.org> Signed-off-by: Thomas Bächler <thomas@archlinux.org> Acked-by: Tejun Heo <tj@kernel.org> Acked-by: H. Peter Anvin <hpa@zytor.com> Tested-by: Alexandre Demers <alexandre.f.demers@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/super.c')
-rw-r--r--fs/super.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/fs/super.c b/fs/super.c
index e9dc3c3fe159..48377f7463c0 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -800,7 +800,10 @@ void emergency_remount(void)
static DEFINE_IDA(unnamed_dev_ida);
static DEFINE_SPINLOCK(unnamed_dev_lock);/* protects the above */
-static int unnamed_dev_start = 0; /* don't bother trying below it */
+/* Many userspace utilities consider an FSID of 0 invalid.
+ * Always return at least 1 from get_anon_bdev.
+ */
+static int unnamed_dev_start = 1;
int get_anon_bdev(dev_t *p)
{