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 the 3.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
fs-don-t-return-0-from-get_anon_bdev.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>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
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From: =?UTF-8?q?Thomas=20B=C3=A4chler?= <thomas@xxxxxxxxxxxxx>
commit a2a4dc494a7b7135f460e38e788c4a58f65e4ac3 upstream.
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
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(-)
--- a/fs/super.c
+++ b/fs/super.c
@@ -802,7 +802,10 @@ 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)
{
Patches currently in stable-queue which might be from thomas@xxxxxxxxxxxxx are
queue-3.14/fs-don-t-return-0-from-get_anon_bdev.patch
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