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dev-mpath: check uuid with device_get_uuid

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This commit is contained in:
Zdenek Kabelac 2024-05-29 22:43:11 +02:00
parent 915dd18361
commit fffff2c2a2
1 changed files with 6 additions and 48 deletions
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54
lib/device/dev-mpath.c
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@ -18,6 +18,7 @@
#include "lib/commands/toolcontext.h"
#include "lib/device/device_id.h"
#include "lib/datastruct/str_list.h"
#include "device_mapper/misc/dm-ioctl.h"
#ifdef UDEV_SYNC_SUPPORT
#include <libudev.h>
#include "lib/device/dev-ext-udev-constants.h"
@ -379,48 +380,6 @@ static const char *_get_sysfs_name_by_devt(const char *sysfs_dir, dev_t devno,
return name;
}
static int _get_sysfs_string(const char *path, char *buffer, int max_size)
{
FILE *fp;
int r = 0;
if (!(fp = fopen(path, "r"))) {
log_sys_error("fopen", path);
return 0;
}
if (!fgets(buffer, max_size, fp))
log_sys_error("fgets", path);
else
r = 1;
if (fclose(fp))
log_sys_error("fclose", path);
return r;
}
static int _get_sysfs_dm_mpath(struct dev_types *dt, const char *sysfs_dir, const char *holder_name)
{
char path[PATH_MAX];
char buffer[128];
if (dm_snprintf(path, sizeof(path), "%sblock/%s/dm/uuid", sysfs_dir, holder_name) < 0) {
log_error("Sysfs path string is too long.");
return 0;
}
buffer[0] = '\0';
if (!_get_sysfs_string(path, buffer, sizeof(buffer)))
return_0;
if (!strncmp(buffer, MPATH_PREFIX, 6))
return 1;
return 0;
}
#ifdef UDEV_SYNC_SUPPORT
static int _dev_is_mpath_component_udev(struct device *dev)
{
@ -462,6 +421,7 @@ static int _dev_is_mpath_component_sysfs(struct cmd_context *cmd, struct device
char link_path[PATH_MAX]; /* some obscure, unpredictable sysfs path */
char holders_path[PATH_MAX]; /* e.g. "/sys/block/sda/holders/" */
char dm_dev_path[PATH_MAX]; /* e.g. "/dev/dm-1" */
char uuid[DM_UUID_LEN];
char *holder_name; /* e.g. "dm-1" */
const char *sysfs_dir = dm_sysfs_dir();
DIR *dr;
@ -573,12 +533,10 @@ static int _dev_is_mpath_component_sysfs(struct cmd_context *cmd, struct device
/* no saved result for dm_dev_minor, so check the uuid for it */
}
/*
* Returns 1 if /sys/block/<holder_name>/dm/uuid indicates that
* <holder_name> is a dm device with dm uuid prefix mpath-.
* When true, <holder_name> will be something like "dm-1".
*/
if (_get_sysfs_dm_mpath(dt, sysfs_dir, holder_name)) {
/* Check whether holder's UUID uses MPATH prefix */
/* TODO: reuse/merge with dev_has_mpath_uuid() as this function also recognizes kpartx partition */
if (device_get_uuid(cmd, dm_dev_major, dm_dev_minor, uuid, sizeof(uuid)) &&
!strncmp(uuid, MPATH_PREFIX, sizeof(MPATH_PREFIX) - 1)) {
log_debug_devs("dev_is_mpath_component %s holder %s %u:%u ignore mpath component",
dev_name(dev), holder_name, dm_dev_major, dm_dev_minor);