qemu-ga: avoid blocking on atime update when reading /etc/mtab
Currently we re-read/re-process /etc/mtab to get an updated list of
mounts when guest-fsfreeze-thaw is called. This can cause an atime
update on /etc/mtab, which will block if we're in a frozen state.
Instead, use /proc's version of mtab, which may not be up-to-date with
options passed via -o remount, but is compatible for our use cases since
we only care about the filesystem type.
Reported-by: Matsuda, Daiki <matsudadik@intellilink.co.jp>
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
diff --git a/qga/commands-posix.c b/qga/commands-posix.c
index 4a71c27..00d035d 100644
--- a/qga/commands-posix.c
+++ b/qga/commands-posix.c
@@ -345,7 +345,7 @@
{
struct mntent *ment;
GuestFsfreezeMount *mount;
- char const *mtab = MOUNTED;
+ char const *mtab = "/proc/self/mounts";
FILE *fp;
fp = setmntent(mtab, "r");
