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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <signal.h>
#include <unistd.h>
#include <glusterfs/api/glfs.h>
#include <glusterfs/api/glfs-handles.h>
#define GF_ENFORCE_MANDATORY_LOCK "trusted.glusterfs.enforce-mandatory-lock"
FILE *logfile_fp;
#define LOG_ERR(func, err) \
do { \
if (!logfile_fp) { \
fprintf(stderr, "%\n%d %s : returned error (%s)\n", __LINE__, \
func, strerror(err)); \
fflush(stderr); \
} else { \
fprintf(logfile_fp, "\n%d %s : returned error (%s)\n", __LINE__, \
func, strerror(err)); \
fflush(logfile_fp); \
} \
} while (0)
glfs_t *
setup_client(char *hostname, char *volname, char *log_file)
{
int ret = 0;
glfs_t *fs = NULL;
fs = glfs_new(volname);
if (!fs) {
fprintf(logfile_fp, "\nglfs_new: returned NULL (%s)\n",
strerror(errno));
goto error;
}
ret = glfs_set_volfile_server(fs, "tcp", hostname, 24007);
if (ret < 0) {
fprintf(logfile_fp, "\nglfs_set_volfile_server failed ret:%d (%s)\n",
ret, strerror(errno));
goto error;
}
ret = glfs_set_logging(fs, log_file, 7);
if (ret < 0) {
fprintf(logfile_fp, "\nglfs_set_logging failed with ret: %d (%s)\n",
ret, strerror(errno));
goto error;
}
ret = glfs_init(fs);
if (ret < 0) {
fprintf(logfile_fp, "\nglfs_init failed with ret: %d (%s)\n", ret,
strerror(errno));
goto error;
}
out:
return fs;
error:
return NULL;
}
int
acquire_mandatory_lock(glfs_t *fs, char *fname)
{
struct flock lock;
int ret = 0;
glfs_fd_t *fd = NULL;
fd = glfs_creat(fs, fname, O_CREAT, 0644);
if (!fd) {
if (errno != EEXIST) {
LOG_ERR("glfs_creat", errno);
ret = -1;
goto out;
}
fd = glfs_open(fs, fname, O_RDWR | O_NONBLOCK);
if (!fd) {
LOG_ERR("glfs_open", errno);
ret = -1;
goto out;
}
}
/* initialize lock */
lock.l_type = F_WRLCK;
lock.l_whence = SEEK_SET;
lock.l_start = 0;
lock.l_len = 100;
ret = glfs_fsetxattr(fd, GF_ENFORCE_MANDATORY_LOCK, "set", 8, 0);
if (ret < 0) {
LOG_ERR("glfs_fsetxattr", errno);
ret = -1;
goto out;
}
pause();
/* take a write mandatory lock */
ret = glfs_file_lock(fd, F_SETLKW, &lock, GLFS_LK_MANDATORY);
if (ret) {
LOG_ERR("glfs_file_lock", errno);
goto out;
}
pause();
out:
if (fd) {
glfs_close(fd);
}
return ret;
}
static void
sigusr1_handler(int signo)
{
/*Signal caught. Just continue with the execution.*/
}
int
main(int argc, char *argv[])
{
int ret = 0;
glfs_t *fs = NULL;
char *volname = NULL;
char log_file[100];
char *hostname = NULL;
char *fname = NULL;
if (argc != 6) {
fprintf(stderr,
"Expect following args %s <host> <volname> <file> <log file "
"location> <log_file_suffix>\n",
argv[0]);
return -1;
}
hostname = argv[1];
volname = argv[2];
fname = argv[3];
/*Use SIGUSR1 and pause()as a means of hitting break-points this program
*when signalled from the .t test case.*/
if (signal(SIGUSR1, sigusr1_handler) == SIG_ERR) {
LOG_ERR("SIGUSR1 handler error", errno);
exit(EXIT_FAILURE);
}
sprintf(log_file, "%s/%s.%s.%s", argv[4], "lock-heal-basic.c", argv[5],
"log");
logfile_fp = fopen(log_file, "w");
if (!logfile_fp) {
fprintf(stderr, "\nfailed to open %s\n", log_file);
fflush(stderr);
return -1;
}
sprintf(log_file, "%s/%s.%s.%s", argv[4], "glfs-client", argv[5], "log");
fs = setup_client(hostname, volname, log_file);
if (!fs) {
LOG_ERR("setup_client", errno);
return -1;
}
ret = acquire_mandatory_lock(fs, fname);
error:
if (fs) {
/*glfs_fini(fs)*/; // glfs fini path is racy and crashes the program
}
fclose(logfile_fp);
return ret;
}
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