This problem can occur when multiple cluster services fail over
at the same time, causing missing high-available exports.
Having a lot of nfs-exports will trigger this issue easier.
Signed-off-by: Steve Dickson <steved@xxxxxxxxxx>
---
support/include/exportfs.h | 4 ++++
utils/exportfs/exportfs.c | 24 ++++++++++++++++++++++++
2 files changed, 28 insertions(+), 0 deletions(-)
diff --git a/support/include/exportfs.h b/support/include/exportfs.h
index 01e87dd..99916e5 100644
--- a/support/include/exportfs.h
+++ b/support/include/exportfs.h
@@ -32,6 +32,10 @@ enum {
FSLOC_STUB
};
+#ifndef EXP_LOCKFILE
+#define EXP_LOCKFILE "/var/lib/nfs/export-lock"
+#endif
+
typedef struct mclient {
struct mclient * m_next;
char * m_hostname;
diff --git a/utils/exportfs/exportfs.c b/utils/exportfs/exportfs.c
index 7432a65..769d438 100644
--- a/utils/exportfs/exportfs.c
+++ b/utils/exportfs/exportfs.c
@@ -16,6 +16,7 @@
#include <sys/stat.h>
#include <sys/vfs.h>
#include <sys/stat.h>
+#include <sys/file.h>
#include <unistd.h>
#include <stdbool.h>
#include <stdlib.h>
@@ -44,6 +45,23 @@ static void validate_export(nfs_export *exp);
static int matchhostname(const char *hostname1, const char *hostname2);
static void export_d_read(const char *dname);
+static const char *lockfile = EXP_LOCKFILE;
+static int _lockfd = -1;
+
+void
+grab_lockfile()
+{
+ _lockfd = open(lockfile, O_CREAT|O_RDWR, 0666);
+ if (_lockfd != -1)
+ lockf(_lockfd, F_LOCK, 0);
+}
+void
+release_lockfile()
+{
+ if (_lockfd != -1)
+ lockf(_lockfd, F_ULOCK, 0);
+}
+
int
main(int argc, char **argv)
{
@@ -129,6 +147,12 @@ main(int argc, char **argv)
return 0;
}
}
+ /*
+ * Serialize things as best we can
+ */
+ grab_lockfile();
+ atexit(release_lockfile);
+
if (f_export && ! f_ignore) {
export_read(_PATH_EXPORTS);
export_d_read(_PATH_EXPORTS_D);
--
1.7.7.6
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