static int check_file_locks()
{
FILE *fp_locks = NULL;
char buf[100];
long long fl_id = 0;
char fl_flag[10], fl_type[15], fl_option[10];
pid_t fl_owner;
int maj, min;
unsigned long i_no;
long long start;
char end[32];
int num;
int count = 3;
fp_locks = fopen("/proc/locks", "r");
if (!fp_locks)
return -1;
test_msg("C: %d/%d/%d\n", inodes[0], inodes[1], inodes[2]);
while (fgets(buf, sizeof(buf), fp_locks)) {
test_msg("c: %s", buf);
if (strstr(buf, "->"))
continue;
num = sscanf(buf,
"%lld:%s %s %s %d %x:%x:%ld %lld %s",
&fl_id, fl_flag, fl_type, fl_option,
&fl_owner, &maj, &min, &i_no, &start, end);
if (num < 10) {
pr_perror("Invalid lock info.");
break;
}
if (i_no != inodes[0] && i_no != inodes[1] && i_no != inodes[2])
continue;
if (!strcmp(m->fsname, "btrfs")) {
if (MKKDEV(major(maj), minor(min)) != dev)
continue;
} else {
if (makedev(maj, min) != dev)
continue;
}
if (!strcmp(fl_flag, "FLOCK") && !strcmp(fl_type, "ADVISORY")) {
if (!strcmp(fl_option, "READ"))
count--;
else if (!strcmp(fl_option, "WRITE"))
count--;
}
if (!strcmp(fl_flag, "FLOCK") &&
!strcmp(fl_type, "MSNFS") &&
!strcmp(fl_option, "READ"))
count--;
memset(fl_flag, 0, sizeof(fl_flag));
memset(fl_type, 0, sizeof(fl_type));
memset(fl_option, 0, sizeof(fl_option));
}
fclose(fp_locks);
/*
* If we find all three matched file locks, count would be 0,
* return 0 for success.
*/
return count;
}
static int check_file_lock(int fd, char *expected_type,
char *expected_option,
unsigned int expected_dev,
unsigned long expected_ino)
{
char buf[100], fl_flag[16], fl_type[16], fl_option[16];
int found = 0, num, fl_owner;
FILE *fp_locks = NULL;
char path[PATH_MAX];
unsigned long i_no;
int maj, min;
test_msg("check_file_lock: (fsname %s) expecting fd %d type %s option %s dev %u ino %lu\n",
m->fsname, fd, expected_type, expected_option, expected_dev, expected_ino);
snprintf(path, sizeof(path), "/proc/self/fdinfo/%d", fd);
fp_locks = fopen(path, "r");
if (!fp_locks) {
pr_err("Can't open %s\n", path);
return -1;
}
while (fgets(buf, sizeof(buf), fp_locks)) {
if (strncmp(buf, "lock:\t", 6) != 0)
continue;
test_msg("c: %s", buf);
memset(fl_flag, 0, sizeof(fl_flag));
memset(fl_type, 0, sizeof(fl_type));
memset(fl_option, 0, sizeof(fl_option));
num = sscanf(buf, "%*s %*d:%s %s %s %d %x:%x:%ld %*d %*s",
fl_flag, fl_type, fl_option, &fl_owner,
&maj, &min, &i_no);
if (num < 7) {
pr_perror("Invalid lock info.");
break;
}
if (!strcmp(m->fsname, "btrfs")) {
if (MKKDEV(major(maj), minor(min)) != expected_dev)
continue;
} else {
if (makedev(maj, min) != expected_dev)
continue;
}
if (fl_owner != getpid())
continue;
if (i_no != expected_ino)
continue;
if (strcmp(fl_flag, "FLOCK"))
continue;
if (strcmp(fl_type, expected_type))
continue;
if (strcmp(fl_option, expected_option))
continue;
found++;
}
fclose(fp_locks);
return found == 1 ? 0 : -1;
}