static int _md_sysfs_attribute_snprintf(char *path, size_t size,
struct dev_types *dt,
struct device *blkdev,
const char *attribute)
{
const char *sysfs_dir = dm_sysfs_dir();
struct stat info;
dev_t dev = blkdev->dev;
int ret = -1;
if (!sysfs_dir || !*sysfs_dir)
return ret;
if (MAJOR(dev) == dt->blkext_major) {
/* lookup parent MD device from blkext partition */
if (!dev_get_primary_dev(dt, blkdev, &dev))
return ret;
}
if (MAJOR(dev) != dt->md_major)
return ret;
ret = dm_snprintf(path, size, "%s/dev/block/%d:%d/md/%s", sysfs_dir,
(int)MAJOR(dev), (int)MINOR(dev), attribute);
if (ret < 0) {
log_error("dm_snprintf md %s failed", attribute);
return ret;
}
if (stat(path, &info) == -1) {
if (errno != ENOENT) {
log_sys_error("stat", path);
return ret;
}
/* old sysfs structure */
ret = dm_snprintf(path, size, "%s/block/md%d/md/%s",
sysfs_dir, (int)MINOR(dev), attribute);
if (ret < 0) {
log_error("dm_snprintf old md %s failed", attribute);
return ret;
}
}
return ret;
}
int dev_subsystem_part_major(struct dev_types *dt, struct device *dev)
{
dev_t primary_dev;
if (MAJOR(dev->dev) == dt->device_mapper_major)
return 1;
if (MAJOR(dev->dev) == dt->drbd_major)
return 1;
if (MAJOR(dev->dev) == dt->emcpower_major)
return 1;
if (MAJOR(dev->dev) == dt->power2_major)
return 1;
if ((MAJOR(dev->dev) == dt->blkext_major) &&
dev_get_primary_dev(dt, dev, &primary_dev) &&
(MAJOR(primary_dev) == dt->md_major))
return 1;
return 0;
}
static unsigned long _dev_topology_attribute(struct dev_types *dt,
const char *attribute,
struct device *dev,
unsigned long default_value)
{
const char *sysfs_dir = dm_sysfs_dir();
char path[PATH_MAX], buffer[64];
FILE *fp;
struct stat info;
dev_t uninitialized_var(primary);
unsigned long result = default_value;
unsigned long value = 0UL;
if (!attribute || !*attribute)
goto_out;
if (!sysfs_dir || !*sysfs_dir)
goto_out;
if (!_snprintf_attr(path, sizeof(path), sysfs_dir, attribute, dev->dev))
goto_out;
/*
* check if the desired sysfs attribute exists
* - if not: either the kernel doesn't have topology support
* or the device could be a partition
*/
if (stat(path, &info) == -1) {
if (errno != ENOENT) {
log_sys_debug("stat", path);
goto out;
}
if (!dev_get_primary_dev(dt, dev, &primary))
goto out;
/* get attribute from partition's primary device */
if (!_snprintf_attr(path, sizeof(path), sysfs_dir, attribute, primary))
goto_out;
if (stat(path, &info) == -1) {
if (errno != ENOENT)
log_sys_debug("stat", path);
goto out;
}
}
if (!(fp = fopen(path, "r"))) {
log_sys_debug("fopen", path);
goto out;
}
if (!fgets(buffer, sizeof(buffer), fp)) {
log_sys_debug("fgets", path);
goto out_close;
}
if (sscanf(buffer, "%lu", &value) != 1) {
log_warn("sysfs file %s not in expected format: %s", path, buffer);
goto out_close;
}
log_very_verbose("Device %s: %s is %lu%s.",
dev_name(dev), attribute, result, default_value ? "" : " bytes");
result = value >> SECTOR_SHIFT;
out_close:
if (fclose(fp))
log_sys_debug("fclose", path);
out:
return result;
}
