This is a note to let you know that I've just added the patch titled
fs: Don't return 0 from get_anon_bdev
to my driver-core git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core.git
in the driver-core-linus branch.
The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)
The patch will hopefully also be merged in Linus's tree for the
next -rc kernel release.
If you have any questions about this process, please let me know.
>From a2a4dc494a7b7135f460e38e788c4a58f65e4ac3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Thomas=20B=C3=A4chler?= <thomas@xxxxxxxxxxxxx>
Date: Thu, 3 Apr 2014 21:55:37 +0200
Subject: fs: Don't return 0 from get_anon_bdev
MIME-Version: 1.0
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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@xxxxxxxxxxxxxxx>
Signed-off-by: Thomas Bächler <thomas@xxxxxxxxxxxxx>
Acked-by: Tejun Heo <tj@xxxxxxxxxx>
Acked-by: H. Peter Anvin <hpa@xxxxxxxxx>
Tested-by: Alexandre Demers <alexandre.f.demers@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/super.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
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)
{
--
1.9.0
--
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