+
+int sysfs_get_ll(struct mdinfo *sra, struct mdinfo *dev,
+ char *name, unsigned long long *val)
+{
+ int n;
+ int fd;
+
+ fd = sysfs_get_fd(sra, dev, name);
+ if (fd < 0)
+ return -1;
+ n = sysfs_fd_get_ll(fd, val);
+ close(fd);
+ return n;
+}
+
+int sysfs_fd_get_two(int fd, unsigned long long *v1, unsigned long long *v2)
+{
+ /* two numbers in this sysfs file, either
+ * NNN (NNN)
+ * or
+ * NNN / NNN
+ */
+ char buf[80];
+ int n;
+ char *ep, *ep2;
+
+ lseek(fd, 0, 0);
+ n = read(fd, buf, sizeof(buf));
+ if (n <= 0 || n == sizeof(buf))
+ return -2;
+ buf[n] = 0;
+ *v1 = strtoull(buf, &ep, 0);
+ if (ep == buf || (*ep != 0 && *ep != '\n' && *ep != ' '))
+ return -1;
+ while (*ep == ' ' || *ep == '/' || *ep == '(')
+ ep++;
+ *v2 = strtoull(ep, &ep2, 0);
+ if (ep2 == ep || (*ep2 != 0 && *ep2 != '\n' && *ep2 != ' ' && *ep2 != ')')) {
+ *v2 = *v1;
+ return 1;
+ }
+ return 2;
+}
+
+int sysfs_get_two(struct mdinfo *sra, struct mdinfo *dev,
+ char *name, unsigned long long *v1, unsigned long long *v2)
+{
+ int n;
+ int fd;
+
+ fd = sysfs_get_fd(sra, dev, name);
+ if (fd < 0)
+ return -1;
+ n = sysfs_fd_get_two(fd, v1, v2);
+ close(fd);
+ return n;
+}
+
+int sysfs_fd_get_str(int fd, char *val, int size)
+{
+ int n;
+
+ lseek(fd, 0, 0);
+ n = read(fd, val, size);
+ if (n <= 0 || n == size)
+ return -1;
+ val[n] = 0;
+ return n;
+}
+
+int sysfs_get_str(struct mdinfo *sra, struct mdinfo *dev,
+ char *name, char *val, int size)
+{
+ int n;
+ int fd;
+
+ fd = sysfs_get_fd(sra, dev, name);
+ if (fd < 0)
+ return -1;
+ n = sysfs_fd_get_str(fd, val, size);
+ close(fd);
+ return n;
+}
+
+int sysfs_set_safemode(struct mdinfo *sra, unsigned long ms)
+{
+ unsigned long sec;
+ unsigned long msec;
+ char delay[30];
+
+ sec = ms / 1000;
+ msec = ms % 1000;
+
+ sprintf(delay, "%ld.%03ld\n", sec, msec);
+ /* this '\n' ^ needed for kernels older than 2.6.28 */
+ return sysfs_set_str(sra, NULL, "safe_mode_delay", delay);
+}
+
+int sysfs_set_array(struct mdinfo *info, int vers)
+{
+ int rv = 0;
+ char ver[100];
+ int raid_disks = info->array.raid_disks;
+
+ ver[0] = 0;
+ if (info->array.major_version == -1 &&
+ info->array.minor_version == -2) {
+ char buf[1024];
+
+ strcat(strcpy(ver, "external:"), info->text_version);
+
+ /* meta version might already be set if we are setting
+ * new geometry for a reshape. In that case we don't
+ * want to over-write the 'readonly' flag that is
+ * stored in the metadata version. So read the current
+ * version first, and preserve the flag
+ */
+ if (sysfs_get_str(info, NULL, "metadata_version",
+ buf, 1024) > 0)
+ if (strlen(buf) >= 9 && buf[9] == '-')
+ ver[9] = '-';
+
+ if ((vers % 100) < 2 ||
+ sysfs_set_str(info, NULL, "metadata_version",
+ ver) < 0) {
+ pr_err("This kernel does not support external metadata.\n");
+ return 1;
+ }
+ }
+ if (info->array.level < 0)
+ return 0; /* FIXME */
+ rv |= sysfs_set_str(info, NULL, "level",
+ map_num(pers, info->array.level));
+ if (info->reshape_active && info->delta_disks != UnSet)
+ raid_disks -= info->delta_disks;
+ rv |= sysfs_set_num(info, NULL, "raid_disks", raid_disks);
+ rv |= sysfs_set_num(info, NULL, "chunk_size", info->array.chunk_size);
+ rv |= sysfs_set_num(info, NULL, "layout", info->array.layout);
+ rv |= sysfs_set_num(info, NULL, "component_size", info->component_size/2);
+ if (info->custom_array_size) {
+ int rc;
+
+ rc = sysfs_set_num(info, NULL, "array_size",
+ info->custom_array_size/2);
+ if (rc && errno == ENOENT) {
+ pr_err("This kernel does not have the md/array_size attribute, the array may be larger than expected\n");
+ rc = 0;
+ }
+ rv |= rc;
+ }
+
+ if (info->array.level > 0)
+ rv |= sysfs_set_num(info, NULL, "resync_start", info->resync_start);
+
+ if (info->reshape_active) {
+ rv |= sysfs_set_num(info, NULL, "reshape_position",
+ info->reshape_progress);
+ rv |= sysfs_set_num(info, NULL, "chunk_size", info->new_chunk);
+ rv |= sysfs_set_num(info, NULL, "layout", info->new_layout);
+ rv |= sysfs_set_num(info, NULL, "raid_disks",
+ info->array.raid_disks);
+ /* We don't set 'new_level' here. That can only happen
+ * once the reshape completes.
+ */
+ }
+ return rv;
+}
+
+int sysfs_add_disk(struct mdinfo *sra, struct mdinfo *sd, int resume)
+{
+ char dv[PATH_MAX];
+ char nm[PATH_MAX];
+ char *dname;
+ int rv;
+
+ sprintf(dv, "%d:%d", sd->disk.major, sd->disk.minor);
+ rv = sysfs_set_str(sra, NULL, "new_dev", dv);
+ if (rv)
+ return rv;
+
+ memset(nm, 0, sizeof(nm));
+ dname = devid2kname(makedev(sd->disk.major, sd->disk.minor));
+ strcpy(sd->sys_name, "dev-");
+ strcpy(sd->sys_name+4, dname);
+
+ /* test write to see if 'recovery_start' is available */
+ if (resume && sd->recovery_start < MaxSector &&
+ sysfs_set_num(sra, sd, "recovery_start", 0)) {
+ sysfs_set_str(sra, sd, "state", "remove");
+ return -1;
+ }
+
+ rv = sysfs_set_num(sra, sd, "offset", sd->data_offset);
+ rv |= sysfs_set_num(sra, sd, "size", (sd->component_size+1) / 2);
+ if (sra->array.level != LEVEL_CONTAINER) {
+ if (sd->recovery_start == MaxSector)
+ /* This can correctly fail if array isn't started,
+ * yet, so just ignore status for now.
+ */
+ sysfs_set_str(sra, sd, "state", "insync");
+ if (sd->disk.raid_disk >= 0)
+ rv |= sysfs_set_num(sra, sd, "slot", sd->disk.raid_disk);
+ if (resume)
+ sysfs_set_num(sra, sd, "recovery_start", sd->recovery_start);
+ }
+ return rv;
+}
+
+#if 0
+int sysfs_disk_to_sg(int fd)
+{
+ /* from an open block device, try find and open its corresponding
+ * scsi_generic interface
+ */
+ struct stat st;
+ char path[256];
+ char sg_path[256];
+ char sg_major_minor[10];
+ char *c;
+ DIR *dir;
+ struct dirent *de;
+ int major, minor, rv;
+
+ if (fstat(fd, &st))
+ return -1;
+
+ snprintf(path, sizeof(path), "/sys/dev/block/%d:%d/device",
+ major(st.st_rdev), minor(st.st_rdev));
+
+ dir = opendir(path);
+ if (!dir)
+ return -1;
+
+ de = readdir(dir);
+ while (de) {
+ if (strncmp("scsi_generic:", de->d_name,
+ strlen("scsi_generic:")) == 0)
+ break;
+ de = readdir(dir);
+ }
+ closedir(dir);
+
+ if (!de)
+ return -1;
+
+ snprintf(sg_path, sizeof(sg_path), "%s/%s/dev", path, de->d_name);
+ fd = open(sg_path, O_RDONLY);
+ if (fd < 0)
+ return fd;
+
+ rv = read(fd, sg_major_minor, sizeof(sg_major_minor));
+ close(fd);
+ if (rv < 0 || rv == sizeof(sg_major_minor))
+ return -1;
+ else
+ sg_major_minor[rv - 1] = '\0';
+
+ c = strchr(sg_major_minor, ':');
+ *c = '\0';
+ c++;
+ major = strtol(sg_major_minor, NULL, 10);
+ minor = strtol(c, NULL, 10);
+ snprintf(path, sizeof(path), "/dev/.tmp.md.%d:%d:%d",
+ (int) getpid(), major, minor);
+ if (mknod(path, S_IFCHR|0600, makedev(major, minor))==0) {
+ fd = open(path, O_RDONLY);
+ unlink(path);
+ return fd;
+ }
+
+ return -1;
+}
+#endif
+
+int sysfs_disk_to_scsi_id(int fd, __u32 *id)
+{
+ /* from an open block device, try to retrieve it scsi_id */
+ struct stat st;
+ char path[256];
+ DIR *dir;
+ struct dirent *de;
+ int host, bus, target, lun;
+
+ if (fstat(fd, &st))
+ return 1;
+
+ snprintf(path, sizeof(path), "/sys/dev/block/%d:%d/device/scsi_device",
+ major(st.st_rdev), minor(st.st_rdev));
+
+ dir = opendir(path);
+ if (!dir)
+ return 1;
+
+ for (de = readdir(dir); de; de = readdir(dir)) {
+ int count;
+
+ if (de->d_type != DT_DIR)
+ continue;
+
+ count = sscanf(de->d_name, "%d:%d:%d:%d", &host, &bus, &target, &lun);
+ if (count == 4)
+ break;
+ }
+ closedir(dir);
+
+ if (!de)
+ return 1;
+
+ *id = (host << 24) | (bus << 16) | (target << 8) | (lun << 0);
+ return 0;
+}
+
+int sysfs_unique_holder(char *devnm, long rdev)
+{
+ /* Check that devnm is a holder of rdev,
+ * and is the only holder.
+ * we should be locked against races by
+ * an O_EXCL on devnm
+ * Return values:
+ * 0 - not unique, not even a holder
+ * 1 - unique, this is the only holder.
+ * 2/3 - not unique, there is another holder
+ * -1 - error, cannot find the holders
+ */
+ DIR *dir;
+ struct dirent *de;
+ char dirname[100];
+ char l;
+ int ret = 0;
+ sprintf(dirname, "/sys/dev/block/%d:%d/holders",
+ major(rdev), minor(rdev));
+ dir = opendir(dirname);
+ if (!dir)
+ return -1;
+ l = strlen(dirname);
+ while ((de = readdir(dir)) != NULL) {
+ char buf[100];
+ char *sl;
+ int n;
+
+ if (de->d_ino == 0)
+ continue;
+ if (de->d_name[0] == '.')
+ continue;
+ strcpy(dirname+l, "/");
+ strcat(dirname+l, de->d_name);
+ n = readlink(dirname, buf, sizeof(buf)-1);
+ if (n <= 0)
+ continue;
+ buf[n] = 0;
+ sl = strrchr(buf, '/');
+ if (!sl)
+ continue;
+ sl++;
+
+ if (strcmp(devnm, sl) == 0)
+ ret |= 1;
+ else
+ ret |= 2;
+ }
+ closedir(dir);
+ return ret;
+}
+
+int sysfs_freeze_array(struct mdinfo *sra)
+{
+ /* Try to freeze resync/rebuild on this array/container.
+ * Return -1 if the array is busy,
+ * return 0 if this kernel doesn't support 'frozen'
+ * return 1 if it worked.
+ */
+ char buf[20];
+
+ if (!sysfs_attribute_available(sra, NULL, "sync_action"))
+ return 1; /* no sync_action == frozen */
+ if (sysfs_get_str(sra, NULL, "sync_action", buf, 20) <= 0)
+ return 0;
+ if (strcmp(buf, "frozen\n") == 0)
+ /* Already frozen */
+ return 0;
+ if (strcmp(buf, "idle\n") != 0 && strcmp(buf, "recover\n") != 0)
+ return -1;
+ if (sysfs_set_str(sra, NULL, "sync_action", "frozen") < 0)
+ return 0;
+ return 1;
+}
+
+int sysfs_wait(int fd, int *msec)
+{
+ /* Wait up to '*msec' for fd to have an exception condition.
+ * if msec == NULL, wait indefinitely.
+ */
+ fd_set fds;
+ int n;
+ FD_ZERO(&fds);
+ FD_SET(fd, &fds);
+ if (msec == NULL)
+ n = select(fd+1, NULL, NULL, &fds, NULL);
+ else if (*msec < 0)
+ n = 0;
+ else {
+ struct timeval start, end, tv;
+ gettimeofday(&start, NULL);
+ if (*msec < 1000) {
+ tv.tv_sec = 0;
+ tv.tv_usec = (*msec)*1000;
+ } else {
+ tv.tv_sec = (*msec)/1000;
+ tv.tv_usec = 0;
+ }
+ n = select(fd+1, NULL, NULL, &fds, &tv);
+ gettimeofday(&end, NULL);
+ end.tv_sec -= start.tv_sec;
+ *msec -= (end.tv_sec * 1000 + end.tv_usec/1000
+ - start.tv_usec/1000) + 1;
+ }
+ return n;
+}