if (n <0 || n >= 1024)
return -1;
buf[n] = 0;
- if (buf[n-1] == '\n')
+ if (n && buf[n-1] == '\n')
buf[n-1] = 0;
return 0;
}
}
}
+int sysfs_open(int devnum, char *devname, char *attr)
+{
+ char fname[50];
+ int fd;
+
+ sprintf(fname, "/sys/block/%s/md/", devnum2devname(devnum));
+ if (devname) {
+ strcat(fname, devname);
+ strcat(fname, "/");
+ }
+ strcat(fname, attr);
+ fd = open(fname, O_RDWR);
+ if (fd < 0 && errno == EACCES)
+ fd = open(fname, O_RDONLY);
+ return fd;
+}
+
struct mdinfo *sysfs_read(int fd, int devnum, unsigned long options)
{
/* Longest possible name in sysfs, mounted at /sys, is
char *dbase;
struct mdinfo *sra;
struct mdinfo *dev;
- DIR *dir;
+ DIR *dir = NULL;
struct dirent *de;
sra = malloc(sizeof(*sra));
sra->array.major_version = -1;
sra->array.minor_version = -2;
strcpy(sra->text_version, buf+9);
- } else
+ } else {
sscanf(buf, "%d.%d",
&sra->array.major_version,
&sra->array.minor_version);
+ strcpy(sra->text_version, buf);
+ }
}
if (options & GET_LEVEL) {
strcpy(base, "level");
goto abort;
sra->array.layout = strtoul(buf, NULL, 0);
}
+ if (options & GET_DISKS) {
+ strcpy(base, "raid_disks");
+ if (load_sys(fname, buf))
+ goto abort;
+ sra->array.raid_disks = strtoul(buf, NULL, 0);
+ }
if (options & GET_COMPONENT) {
strcpy(base, "component_size");
if (load_sys(fname, buf))
strcpy(dbase, "size");
if (load_sys(fname, buf))
goto abort;
- dev->component_size = strtoull(buf, NULL, 0);
+ dev->component_size = strtoull(buf, NULL, 0) * 2;
}
if (options & GET_STATE) {
dev->disk.state = 0;
dev->errors = strtoul(buf, NULL, 0);
}
}
+ closedir(dir);
return sra;
abort:
+ if (dir)
+ closedir(dir);
sysfs_free(sra);
return NULL;
}
char fname[50];
int n;
int fd;
+
sprintf(fname, "/sys/block/%s/md/%s/%s",
sra->sys_name, dev?dev->sys_name:"", name);
fd = open(fname, O_WRONLY);
rv |= sysfs_set_num(sra, NULL, "raid_disks", info->array.raid_disks);
rv |= sysfs_set_num(sra, NULL, "chunk_size", info->array.chunk_size);
rv |= sysfs_set_num(sra, NULL, "layout", info->array.layout);
- rv |= sysfs_set_num(sra, NULL, "component_size", info->component_size);
+ rv |= sysfs_set_num(sra, NULL, "component_size", info->component_size/2);
rv |= sysfs_set_num(sra, NULL, "resync_start", info->resync_start);
sra->array = info->array;
return rv;
}
-int sysfs_add_disk(struct mdinfo *sra, int fd, struct mdinfo *sd)
+int sysfs_add_disk(struct mdinfo *sra, struct mdinfo *sd)
{
char dv[100];
char nm[100];
memset(nm, 0, sizeof(nm));
sprintf(dv, "/sys/dev/block/%d:%d", sd->disk.major, sd->disk.minor);
- if (readlink(dv, nm, sizeof(nm)) < 0)
+ rv = readlink(dv, nm, sizeof(nm));
+ if (rv <= 0)
return -1;
+ nm[rv] = '\0';
dname = strrchr(nm, '/');
if (dname) dname++;
strcpy(sd->sys_name, "dev-");
strcpy(sd->sys_name+4, dname);
- rv |= sysfs_set_num(sra, sd, "offset", sd->data_offset);
+ 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) {
rv |= sysfs_set_num(sra, sd, "slot", sd->disk.raid_disk);
// rv |= sysfs_set_str(sra, sd, "state", "in_sync");
}
- sd2 = malloc(sizeof(*sd2));
- *sd2 = *sd;
- sd2->next = sra->devs;
- sra->devs = sd2;
-
+ if (! rv) {
+ sd2 = malloc(sizeof(*sd2));
+ *sd2 = *sd;
+ sd2->next = sra->devs;
+ sra->devs = sd2;
+ }
return rv;
}
+
+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[8];
+ 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)
+ 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;
+}
+
+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];
+ char *c1, *c2;
+ DIR *dir;
+ struct dirent *de;
+
+ 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_disk:", de->d_name,
+ strlen("scsi_disk:")) == 0)
+ break;
+ de = readdir(dir);
+ }
+ closedir(dir);
+
+ if (!de)
+ return 1;
+
+ c1 = strchr(de->d_name, ':');
+ c1++;
+ c2 = strchr(c1, ':');
+ *c2 = '\0';
+ *id = strtol(c1, NULL, 10) << 24; /* host */
+ c1 = c2 + 1;
+ c2 = strchr(c1, ':');
+ *c2 = '\0';
+ *id |= strtol(c1, NULL, 10) << 16; /* channel */
+ c1 = c2 + 1;
+ c2 = strchr(c1, ':');
+ *c2 = '\0';
+ *id |= strtol(c1, NULL, 10) << 8; /* lun */
+ c1 = c2 + 1;
+ *id |= strtol(c1, NULL, 10); /* id */
+
+ return 0;
+}
+
+
+int sysfs_unique_holder(int devnum, long rdev)
+{
+ /* Check that devnum is a holder of rdev,
+ * and is the only holder.
+ * we should be locked against races by
+ * an O_EXCL on devnum
+ */
+ DIR *dir;
+ struct dirent *de;
+ char dirname[100];
+ char l;
+ int found = 0;
+ sprintf(dirname, "/sys/dev/block/%d:%d/holders",
+ major(rdev), minor(rdev));
+ dir = opendir(dirname);
+ errno = ENOENT;
+ if (!dir)
+ return 0;
+ l = strlen(dirname);
+ while ((de = readdir(dir)) != NULL) {
+ char buf[10];
+ int n;
+ int mj, mn;
+ char c;
+ int fd;
+
+ if (de->d_ino == 0)
+ continue;
+ if (de->d_name[0] == '.')
+ continue;
+ strcpy(dirname+l, "/");
+ strcat(dirname+l, de->d_name);
+ strcat(dirname+l, "/dev");
+ fd = open(dirname, O_RDONLY);
+ if (fd < 0) {
+ errno = ENOENT;
+ break;
+ }
+ n = read(fd, buf, sizeof(buf)-1);
+ close(fd);
+ buf[n] = 0;
+ if (sscanf(buf, "%d:%d%c", &mj, &mn, &c) != 3 ||
+ c != '\n') {
+ errno = ENOENT;
+ break;
+ }
+ if (mj != MD_MAJOR)
+ mn = -1-(mn>>6);
+
+ if (devnum != mn) {
+ errno = EEXIST;
+ break;
+ }
+ found = 1;
+ }
+ closedir(dir);
+ if (de)
+ return 0;
+ else
+ return found;
+}
projects / thirdparty / mdadm.git / blobdiff