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authorThomas Bächler <thomas@archlinux.org>2014-04-03 21:55:37 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-05-31 13:20:31 -0700
commit47ce856c8f85530d6586562f982493dae2a4423e (patch)
treee28a8c13d074a6e8edc6a158bcb99d0fe4cdb6dc /fs
parent2ad1de98b6fc6c7d04b00506e77b2aa1f7838c01 (diff)
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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs')
-rw-r--r--fs/super.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/fs/super.c b/fs/super.c
index 80d5cf2ca765..7624267b2043 100644
--- 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)
{