#include "blkidP.h"
#include "pathnames.h"
#include "at.h"
+#include "sysfs.h"
char *blkid_strndup(const char *s, int length)
{
return ++p;
}
-static char *scandev_devno_to_devname(dev_t devno)
+static char *scandev_devno_to_devpath(dev_t devno)
{
struct dir_list *list = NULL, *new_list = NULL;
char *devname = NULL;
return devname;
}
-static char *sysfs_devno_to_devname(dev_t dev)
-{
- char path[PATH_MAX];
- char linkpath[PATH_MAX];
- struct stat st;
- char *name;
- int rc;
-
- rc = snprintf(path, sizeof(path), "/sys/dev/block/%d:%d",
- major(dev), minor(dev));
- if (rc < 0 || rc + 1 > sizeof(path))
- return NULL;
-
- rc = readlink(path, linkpath, sizeof(linkpath) - 1);
- if (rc < 0)
- return NULL;
- linkpath[rc] = '\0';
-
- name = stripoff_last_component(linkpath); /* basename */
- if (!name)
- return NULL;
-
- rc = snprintf(path, sizeof(path), "/dev/%s", name);
- if (rc < 0 || rc + 1 > sizeof(path))
- return NULL;
-
- if (!stat(path, &st) && S_ISBLK(st.st_mode) && st.st_rdev == dev)
- return strdup(path);
-
- return NULL;
-}
-
/**
* blkid_devno_to_devname:
* @devno: device number
*/
char *blkid_devno_to_devname(dev_t devno)
{
- char *devname = NULL;
+ char *path = NULL;
+ char buf[PATH_MAX];
- devname = sysfs_devno_to_devname(devno);
- if (!devname)
- devname = scandev_devno_to_devname(devno);
+ path = sysfs_devno_to_devpath(devno, buf, sizeof(buf));
+ if (path)
+ path = strdup(path);
+ if (!path)
+ path = scandev_devno_to_devpath(devno);
- if (!devname) {
+ if (!path) {
DBG(DEBUG_DEVNO,
printf("blkid: couldn't find devno 0x%04lx\n",
(unsigned long) devno));
} else {
DBG(DEBUG_DEVNO,
- printf("found devno 0x%04llx as %s\n", (long long)devno, devname));
+ printf("found devno 0x%04llx as %s\n", (long long)devno, path));
}
- return devname;
+ return path;
+}
+
+static int get_dm_wholedisk(struct sysfs_cxt *cxt, char *diskname,
+ size_t len, dev_t *diskdevno)
+{
+ int rc = 0;
+ char *name;
+
+ /* Note, sysfs_get_slave() returns the first slave only,
+ * if there is more slaves, then return NULL
+ */
+ name = sysfs_get_slave(cxt);
+ if (!name)
+ return -1;
+
+ if (diskname && len) {
+ strncpy(diskname, name, len);
+ diskname[len - 1] = '\0';
+ }
+
+ if (diskdevno) {
+ *diskdevno = sysfs_devname_to_devno(name, NULL);
+ if (!*diskdevno)
+ rc = -1;
+ }
+
+ free(name);
+ return rc;
}
/**
int blkid_devno_to_wholedisk(dev_t dev, char *diskname,
size_t len, dev_t *diskdevno)
{
- char path[PATH_MAX];
- char linkpath[PATH_MAX];
- struct stat info;
- char *name;
- int rc, linklen;
+ struct sysfs_cxt cxt;
+ int is_part = 0;
if (!dev)
goto err;
-
- /* check if dev is a partition */
- rc = snprintf(path, sizeof(path), "/sys/dev/block/%d:%d/partition",
- major(dev), minor(dev));
- if (rc < 0 || rc + 1 > sizeof(path))
- goto err;
-
- rc = stat(path, &info); /* 'rc == 0' means partitioned dev */
-
- /* aka dirname (remove "/partition" from the path*/
- stripoff_last_component(path);
-
- /*
- * Unpartitioned device:
- * - readlink /sys/dev/block/8:0 = ../../block/sda
- * - basename ../../block/sda = sda
- *
- * Partitioned device:
- * - readlink /sys/dev/block/8:1 = ../../block/sda/sda1
- * - dirname ../../block/sda/sda1 = ../../block/sda
- * - basename ../../block/sda = sda
- */
- linklen = readlink(path, linkpath, sizeof(linkpath) - 1);
- if (linklen < 0)
+ if (sysfs_init(&cxt, dev, NULL))
goto err;
- linkpath[linklen] = '\0';
- if (rc == 0)
- /* partitioned device */
- stripoff_last_component(linkpath); /* dirname */
-
- name = stripoff_last_component(linkpath); /* basename */
- if (!name)
- goto err;
-
- if (diskname && len) {
- strncpy(diskname, name, len);
- diskname[len - 1] = '\0';
+ is_part = sysfs_has_attribute(&cxt, "partition");
+ if (!is_part) {
+ /*
+ * Extra case for partitions mapped by device-mapper.
+ *
+ * All regualar partitions (added by BLKPG ioctl or kernel PT
+ * parser) have the /sys/.../partition file. The partitions
+ * mapped by DM don't have such file, but they have "part"
+ * prefix in DM UUID.
+ */
+ char *uuid = sysfs_strdup(&cxt, "dm/uuid");
+ char *tmp = uuid;
+ char *prefix = uuid ? strsep(&tmp, "-") : NULL;
+
+ if (prefix && strncasecmp(prefix, "part", 4) == 0)
+ is_part = 1;
+ free(uuid);
+
+ if (is_part &&
+ get_dm_wholedisk(&cxt, diskname, len, diskdevno) == 0)
+ /*
+ * partitioned device, mapped by DM
+ */
+ goto done;
+
+ is_part = 0;
}
- if (diskdevno) {
- int maj, min;
- FILE *f;
+ if (!is_part) {
+ /*
+ * unpartitioned device
+ */
+ if (diskname && len) {
+ if (!sysfs_get_devname(&cxt, diskname, len))
+ goto err;
+ }
+ if (diskdevno)
+ *diskdevno = dev;
- /* read wholedisk devno */
- rc = snprintf(path, sizeof(path), "/sys/block/%s/dev", name);
- if (rc < 0 || rc + 1 > sizeof(path))
- goto err;
+ } else {
+ /*
+ * partitioned device
+ * - readlink /sys/dev/block/8:1 = ../../block/sda/sda1
+ * - dirname ../../block/sda/sda1 = ../../block/sda
+ * - basename ../../block/sda = sda
+ */
+ char linkpath[PATH_MAX];
+ char *name;
+ int linklen;
- f = fopen(path, "r");
- if (!f)
+ linklen = sysfs_readlink(&cxt, NULL,
+ linkpath, sizeof(linkpath) - 1);
+ if (linklen < 0)
goto err;
+ linkpath[linklen] = '\0';
- rc = fscanf(f, "%d:%d", &maj, &min);
- fclose(f);
- if (rc != 2)
+ stripoff_last_component(linkpath); /* dirname */
+ name = stripoff_last_component(linkpath); /* basename */
+ if (!name)
goto err;
- *diskdevno = makedev(maj, min);
+ if (diskname && len) {
+ strncpy(diskname, name, len);
+ diskname[len - 1] = '\0';
+ }
+
+ if (diskdevno) {
+ *diskdevno = sysfs_devname_to_devno(name, NULL);
+ if (!*diskdevno)
+ goto err;
+ }
}
+done:
+ sysfs_deinit(&cxt);
+
DBG(DEBUG_DEVNO,
- printf("found entire diskname for devno 0x%04llx as %s\n",
- (long long) dev, name));
+ printf("found entire diskname for devno 0x%04llx %s\n",
+ (long long) dev, diskname ? diskname : ""));
return 0;
err:
+ sysfs_deinit(&cxt);
+
DBG(DEBUG_DEVNO,
printf("failed to convert 0x%04llx to wholedisk name, errno=%d\n",
(long long) dev, errno));
int main(int argc, char** argv)
{
char *devname, *tmp;
+ char diskname[PATH_MAX];
int major, minor;
- dev_t devno;
+ dev_t devno, disk_devno;
const char *errmsg = "Couldn't parse %s: %s\n";
blkid_init_debug(DEBUG_ALL);
printf("Looking for device 0x%04llx\n", (long long)devno);
devname = blkid_devno_to_devname(devno);
free(devname);
+
+ printf("Looking for whole-device for 0x%04llx\n", (long long)devno);
+ blkid_devno_to_wholedisk(devno, diskname, sizeof(diskname), &disk_devno);
+
return 0;
}
#endif
projects / thirdparty / util-linux.git / commitdiff
