79 lines
2.1 KiB
Diff
79 lines
2.1 KiB
Diff
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Fix problems that suspend eventchannel lock file might be obselete for some reason
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like segment fault or other abnormal exit, and once obselete lock file exists,
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it might affact latter save process.
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Have discussed with upstream, for some reason not accepted.
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http://xen.1045712.n5.nabble.com/Re-PATCH-improve-suspend-evtchn-lock-processing-td3395229.html
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Signed-off-by: Chunyan Liu <cyliu@suse.com>
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Index: xen-4.10.0-testing/tools/libs/guest/xg_suspend.c
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===================================================================
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--- xen-4.10.0-testing.orig/tools/libs/guest/xg_suspend.c
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+++ xen-4.10.0-testing/tools/libs/guest/xg_suspend.c
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@@ -20,6 +20,10 @@
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#include "xc_private.h"
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#include "xenguest.h"
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+#include <signal.h>
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+#ifdef __MINIOS__
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+extern int kill (__pid_t __pid, int __sig);
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+#endif
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#define SUSPEND_LOCK_FILE XEN_RUN_DIR "/suspend-evtchn-%d.lock"
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@@ -35,6 +39,37 @@
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#define SUSPEND_FILE_BUFLEN (sizeof(SUSPEND_LOCK_FILE) + 10)
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+/* cleanup obsolete suspend lock file which is unlinked for any reason,
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+so that current process can get lock */
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+static void clean_obsolete_lock(int domid)
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+{
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+ int fd, pid, n;
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+ char buf[128];
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+ char suspend_file[256];
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+
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+ snprintf(suspend_file, sizeof(suspend_file), "%s_%d_lock.d",
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+ SUSPEND_LOCK_FILE, domid);
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+ fd = open(suspend_file, O_RDWR);
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+
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+ if (fd < 0)
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+ return;
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+
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+ n = read(fd, buf, 127);
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+
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+ close(fd);
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+
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+ if (n > 0)
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+ {
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+ sscanf(buf, "%d", &pid);
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+ /* pid does not exist, this lock file is obsolete, just delete it */
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+ if ( kill(pid,0) )
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+ {
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+ unlink(suspend_file);
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+ return;
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+ }
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+ }
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+}
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+
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static void get_suspend_file(char buf[], uint32_t domid)
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{
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snprintf(buf, SUSPEND_FILE_BUFLEN, SUSPEND_LOCK_FILE, domid);
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@@ -48,6 +83,7 @@ static int lock_suspend_event(xc_interfa
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struct flock fl;
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get_suspend_file(suspend_file, domid);
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+ clean_obsolete_lock(domid);
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*lockfd = -1;
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@@ -97,6 +133,8 @@ static int lock_suspend_event(xc_interfa
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if (fd >= 0)
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close(fd);
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+ unlink(suspend_file);
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+
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return -1;
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}
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