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device_id: more use of device_get_uuid

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Use function that is caching UUID if kernel provides functionality
from a single ioctl() call.
This commit is contained in:
Zdenek Kabelac 2024-05-29 23:50:38 +02:00
parent fffff2c2a2
commit 13e0222ba2
1 changed files with 37 additions and 47 deletions
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84
lib/device/device_id.c
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@ -25,6 +25,8 @@
#include "lib/cache/lvmcache.h"
#include "lib/datastruct/str_list.h"
#include "lib/metadata/metadata-exported.h"
#include "lib/activate/activate.h"
#include "device_mapper/misc/dm-ioctl.h"
#include <sys/stat.h>
#include <fcntl.h>
@ -506,18 +508,19 @@ static int _dm_uuid_has_prefix(char *sysbuf, const char *prefix)
/* the dm uuid uses the wwid of the underlying dev */
int dev_has_mpath_uuid(struct cmd_context *cmd, struct device *dev, const char **idname_out)
{
char sysbuf[PATH_MAX] = { 0 };
char uuid[DM_UUID_LEN];
const char *idname;
if (!read_sys_block(cmd, dev, "dm/uuid", sysbuf, sizeof(sysbuf)))
return 0;
if (!device_get_uuid(cmd, MAJOR(dev->dev), MINOR(dev->dev), uuid, sizeof(uuid)))
return_0;
if (!_dm_uuid_has_prefix(sysbuf, "mpath-"))
if (!_dm_uuid_has_prefix(uuid, "mpath-"))
return 0;
if (!idname_out)
return 1;
if (!(idname = strdup(sysbuf)))
if (!(idname = strdup(uuid)))
return_0;
*idname_out = idname;
return 1;
@ -525,18 +528,18 @@ int dev_has_mpath_uuid(struct cmd_context *cmd, struct device *dev, const char *
static int _dev_has_crypt_uuid(struct cmd_context *cmd, struct device *dev, const char **idname_out)
{
char sysbuf[PATH_MAX] = { 0 };
char uuid[DM_UUID_LEN];
const char *idname;
if (!read_sys_block(cmd, dev, "dm/uuid", sysbuf, sizeof(sysbuf)))
return 0;
if (!device_get_uuid(cmd, MAJOR(dev->dev), MINOR(dev->dev), uuid, sizeof(uuid)))
return_0;
if (!_dm_uuid_has_prefix(sysbuf, "CRYPT-"))
if (!_dm_uuid_has_prefix(uuid, "CRYPT-"))
return 0;
if (!idname_out)
return 1;
if (!(idname = strdup(sysbuf)))
if (!(idname = strdup(uuid)))
return_0;
*idname_out = idname;
return 1;
@ -544,18 +547,18 @@ static int _dev_has_crypt_uuid(struct cmd_context *cmd, struct device *dev, cons
static int _dev_has_lvmlv_uuid(struct cmd_context *cmd, struct device *dev, const char **idname_out)
{
char sysbuf[PATH_MAX] = { 0 };
char uuid[DM_UUID_LEN];
const char *idname;
if (!read_sys_block(cmd, dev, "dm/uuid", sysbuf, sizeof(sysbuf)))
return 0;
if (!device_get_uuid(cmd, MAJOR(dev->dev), MINOR(dev->dev), uuid, sizeof(uuid)))
return_0;
if (!_dm_uuid_has_prefix(sysbuf, "LVM-"))
if (!_dm_uuid_has_prefix(uuid, UUID_PREFIX))
return 0;
if (!idname_out)
return 1;
if (!(idname = strdup(sysbuf)))
if (!(idname = strdup(uuid)))
return_0;
*idname_out = idname;
return 1;
@ -773,49 +776,36 @@ const char *device_id_system_read(struct cmd_context *cmd, struct device *dev, u
struct dev_wwid *dw;
unsigned i;
if (idtype == DEV_ID_TYPE_SYS_WWID)
switch (idtype) {
case DEV_ID_TYPE_SYS_WWID:
dev_read_sys_wwid(cmd, dev, sysbuf, sizeof(sysbuf), NULL);
else if (idtype == DEV_ID_TYPE_SYS_SERIAL)
break;
case DEV_ID_TYPE_SYS_SERIAL:
_dev_read_sys_serial(cmd, dev, sysbuf, sizeof(sysbuf));
else if (idtype == DEV_ID_TYPE_MPATH_UUID) {
read_sys_block(cmd, dev, "dm/uuid", sysbuf, sizeof(sysbuf));
/* if (strncmp(sysbuf, "mpath", 5)) sysbuf[0] = '\0'; */
}
else if (idtype == DEV_ID_TYPE_CRYPT_UUID) {
read_sys_block(cmd, dev, "dm/uuid", sysbuf, sizeof(sysbuf));
/* if (strncmp(sysbuf, "CRYPT", 5)) sysbuf[0] = '\0'; */
}
else if (idtype == DEV_ID_TYPE_LVMLV_UUID) {
read_sys_block(cmd, dev, "dm/uuid", sysbuf, sizeof(sysbuf));
/* if (strncmp(sysbuf, "LVM", 3)) sysbuf[0] = '\0'; */
}
else if (idtype == DEV_ID_TYPE_MD_UUID) {
break;
case DEV_ID_TYPE_MPATH_UUID:
case DEV_ID_TYPE_CRYPT_UUID:
case DEV_ID_TYPE_LVMLV_UUID:
(void)device_get_uuid(cmd, MAJOR(dev->dev), MINOR(dev->dev), sysbuf, sizeof(sysbuf));
break;
case DEV_ID_TYPE_MD_UUID:
read_sys_block(cmd, dev, "md/uuid", sysbuf, sizeof(sysbuf));
}
else if (idtype == DEV_ID_TYPE_LOOP_FILE) {
break;
case DEV_ID_TYPE_LOOP_FILE:
read_sys_block(cmd, dev, "loop/backing_file", sysbuf, sizeof(sysbuf));
/* if backing file is deleted, fall back to devname */
if (strstr(sysbuf, "(deleted)"))
sysbuf[0] = '\0';
}
else if (idtype == DEV_ID_TYPE_DEVNAME) {
break;
case DEV_ID_TYPE_DEVNAME:
if (dm_list_empty(&dev->aliases))
goto_bad;
if (!(idname = strdup(dev_name(dev))))
goto_bad;
return idname;
}
else if (idtype == DEV_ID_TYPE_WWID_NAA ||
idtype == DEV_ID_TYPE_WWID_EUI ||
idtype == DEV_ID_TYPE_WWID_T10) {
case DEV_ID_TYPE_WWID_NAA:
case DEV_ID_TYPE_WWID_EUI:
case DEV_ID_TYPE_WWID_T10:
if (!(dev->flags & DEV_ADDED_VPD_WWIDS))
dev_read_vpd_wwids(cmd, dev);
dm_list_iterate_items(dw, &dev->wwids) {
@ -1015,7 +1005,7 @@ static int _dev_has_stable_id(struct cmd_context *cmd, struct device *dev)
}
if ((MAJOR(dev->dev) == cmd->dev_types->device_mapper_major)) {
if (!read_sys_block(cmd, dev, "dm/uuid", sysbuf, sizeof(sysbuf)))
if (!device_get_uuid(cmd, MAJOR(dev->dev), MINOR(dev->dev), sysbuf, sizeof(sysbuf)))
goto_out;
if (_dm_uuid_has_prefix(sysbuf, "mpath-"))