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| author | Thomas Bächler <thomas@archlinux.org> | 2014-04-03 21:55:37 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-04-16 11:53:08 -0700 |
| commit | a2a4dc494a7b7135f460e38e788c4a58f65e4ac3 (patch) | |
| tree | 8b593307370f6e4ade7630be2a1e66eb2770e745 /fs/super.c | |
| parent | c9eaa447e77efe77b7fa4c953bd62de8297fd6c5 (diff) | |
| download | lwn-a2a4dc494a7b7135f460e38e788c4a58f65e4ac3.tar.gz lwn-a2a4dc494a7b7135f460e38e788c4a58f65e4ac3.zip | |
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.c | 5 |
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) { |