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| author | Thomas Bächler <thomas@archlinux.org> | 2014-04-03 21:55:37 +0200 |
|---|---|---|
| committer | Jiri Slaby <jslaby@suse.cz> | 2014-05-29 11:38:24 +0200 |
| commit | c36604fe10ee69babe452bf5f888185ef163cd39 (patch) | |
| tree | fa78ef7f3ed77316a1b3039e0985709a6f2c780e | |
| parent | 0610ae43cefde18c9270e7c791faa629382200f1 (diff) | |
| download | lwn-c36604fe10ee69babe452bf5f888185ef163cd39.tar.gz lwn-c36604fe10ee69babe452bf5f888185ef163cd39.zip | |
fs: Don't return 0 from get_anon_bdev
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@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: Jiri Slaby <jslaby@suse.cz>
| -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 0225c20f8770..d127de207376 100644 --- a/fs/super.c +++ b/fs/super.c @@ -845,7 +845,10 @@ 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) { |