the current implementation fails if we try to freeze an
already frozen filesystem. This can happen if a filesystem
is mounted more than once (e.g. with a bind mount).
Suggested-by: Christian Theune <c...@flyingcircus.io>
Cc: qemu-sta...@nongnu.org
Signed-off-by: Peter Lieven <p...@kamp.de>
---
qga/commands-posix.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/qga/commands-posix.c b/qga/commands-posix.c
index ea37c09..73d93eb 100644
--- a/qga/commands-posix.c
+++ b/qga/commands-posix.c
@@ -1243,6 +1243,9 @@ int64_t qmp_guest_fsfreeze_freeze_list(bool
has_mountpoints,
* filesystems may not implement fsfreeze for less obvious reasons.
* these will report EOPNOTSUPP. we simply ignore these when tallying
* the number of frozen filesystems.
+ * if a filesystem is mounted more than once (aka bind mount) a
+ * consecutive attempt to freeze an already frozen filesystem will
+ * return EBUSY.
*
* any other error means a failure to freeze a filesystem we
* expect to be freezable, so return an error in those cases
@@ -1250,7 +1253,7 @@ int64_t qmp_guest_fsfreeze_freeze_list(bool
has_mountpoints,
*/
ret = ioctl(fd, FIFREEZE);
if (ret == -1) {
- if (errno != EOPNOTSUPP) {
+ if (errno != EOPNOTSUPP && errno != EBUSY) {
error_setg_errno(errp, errno, "failed to freeze %s",
mount->dirname);
close(fd);
--
1.9.1
