mount/fuse: add test cases for lock migration

Change-Id: I1a48c63387c7803b36584070fd8f3684ccb696b1
BUG: 808400
Signed-off-by: Raghavendra G <raghavendra@gluster.com>
Reviewed-on: http://review.gluster.org/4209
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>

1 files changed, 113 insertions, 0 deletions

diff --git a/tests/bugs/bug-808400-fcntl.c b/tests/bugs/bug-808400-fcntl.c
new file mode 100644
index 00000000000..36e6cf035eb
--- /dev/null
+++ b/tests/bugs/bug-808400-fcntl.c
@@ -0,0 +1,113 @@
+#include <sys/file.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <sys/wait.h>
+
+int
+run_child (char *filename)
+{
+        int          fd   = -1, ret = -1;
+        struct flock lock = {0, };
+        int          ppid = 0;
+
+        fd = open (filename, O_RDWR);
+        if (fd < 0) {
+                fprintf (stderr, "open failed (%s)\n", strerror (errno));
+                goto out;
+        }
+
+        ppid = getppid ();
+
+        lock.l_type = F_WRLCK;
+        lock.l_whence = SEEK_SET;
+        lock.l_start = 0;
+        lock.l_len = 0;
+
+        ret = fcntl (fd, F_GETLK, &lock);
+        if (ret < 0) {
+                fprintf (stderr, "GETLK failed (%s)\n", strerror (errno));
+                goto out;
+        }
+
+        if ((lock.l_type == F_UNLCK) ||
+            (ppid != lock.l_pid)) {
+                fprintf (stderr, "no locks present, though parent has held "
+                         "one\n");
+                ret = -1;
+                goto out;
+        }
+
+        ret = 0;
+out:
+        return ret;
+}
+
+int
+main (int argc, char *argv[])
+{
+        int          fd       = -1, ret = -1, status = 0;
+        char        *filename = NULL, *cmd = NULL;
+        struct stat  stbuf    = {0, };
+        struct flock lock     = {0, };
+
+        if (argc != 3) {
+                fprintf (stderr, "Usage: %s <filename> "
+                         "<gluster-cmd-to-trigger-graph-switch>\n", argv[0]);
+                goto out;
+        }
+
+        filename = argv[1];
+        cmd = argv[2];
+
+        fd = open (filename, O_RDWR | O_CREAT, 0);
+        if (fd < 0) {
+                fprintf (stderr, "open (%s) failed (%s)\n", filename,
+                         strerror (errno));
+                goto out;
+        }
+
+        lock.l_type = F_WRLCK;
+        lock.l_whence = SEEK_SET;
+        lock.l_start = 0;
+        lock.l_len = 0;
+
+        ret = fcntl (fd, F_SETLK, &lock);
+        if (ret < 0) {
+                fprintf (stderr, "fcntl failed (%s)\n", strerror (errno));
+                goto out;
+        }
+
+        system (cmd);
+
+        /* wait till graph switch completes */
+        ret = fstat (fd, &stbuf);
+        if (ret < 0) {
+                fprintf (stderr, "fstat failure (%s)\n", strerror (errno));
+                goto out;
+        }
+
+        sleep (10);
+
+        /* By now old-graph would be disconnected and locks should be cleaned
+         * up if they are not migrated. Check that by trying to acquire a lock
+         * on a new fd opened by another process on same file.
+         */
+        ret = fork ();
+        if (ret == 0) {
+                ret = run_child (filename);
+        } else {
+                wait (&status);
+                if (WIFEXITED(status)) {
+                        ret = WEXITSTATUS(status);
+                } else {
+                        ret = 0;
+                }
+        }
+
+out:
+        return ret;
+}