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qemu-ga: avoid blocking on atime update when reading /etc/mtab

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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>
This commit is contained in:
Michael Roth 2012-05-29 10:08:50 -05:00
parent eecae14724
commit 9e2fa418fb
1 changed files with 1 additions and 1 deletions
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2
qga/commands-posix.c
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@ -345,7 +345,7 @@ static int guest_fsfreeze_build_mount_list(GuestFsfreezeMountList *mounts)
{
struct mntent *ment;
GuestFsfreezeMount *mount;
char const *mtab = MOUNTED;
char const *mtab = "/proc/self/mounts";
FILE *fp;
fp = setmntent(mtab, "r");