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alua.c
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alua.c
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/*
* Copyright (c) 2017 Red Hat, Inc.
*
* This file is licensed to you under your choice of the GNU Lesser
* General Public License, version 2.1 or any later version (LGPLv2.1 or
* later), or the Apache License 2.0.
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <errno.h>
#include <dirent.h>
#include <inttypes.h>
#include <limits.h>
#include "ccan/list/list.h"
#include <scsi/scsi.h>
#include "libtcmu_log.h"
#include "libtcmu_common.h"
#include "libtcmu_priv.h"
#include "tcmu-runner.h"
#include "tcmur_device.h"
#include "target.h"
#include "alua.h"
static char *tcmu_get_alua_str_setting(struct alua_grp *group,
const char *setting)
{
char path[PATH_MAX];
snprintf(path, sizeof(path), CFGFS_CORE"/%s/%s/alua/%s/%s",
group->dev->tcm_hba_name, group->dev->tcm_dev_name,
group->name, setting);
return tcmu_cfgfs_get_str(path);
}
static int tcmu_get_alua_int_setting(struct alua_grp *group,
const char *setting)
{
char path[PATH_MAX];
snprintf(path, sizeof(path), CFGFS_CORE"/%s/%s/alua/%s/%s",
group->dev->tcm_hba_name, group->dev->tcm_dev_name,
group->name, setting);
return tcmu_cfgfs_get_int(path);
}
static int tcmu_set_alua_int_setting(struct alua_grp *group,
const char *setting, int val)
{
char path[PATH_MAX];
snprintf(path, sizeof(path), CFGFS_CORE"/%s/%s/alua/%s/%s",
group->dev->tcm_hba_name, group->dev->tcm_dev_name,
group->name, setting);
return tcmu_cfgfs_set_u32(path, val);
}
static void tcmu_release_tgt_ports(struct alua_grp *group)
{
struct tgt_port *port, *port_next;
list_for_each_safe(&group->tgt_ports, port, port_next, entry) {
list_del(&port->entry);
tcmu_free_tgt_port(port);
}
}
static void tcmu_free_alua_grp(struct alua_grp *group)
{
tcmu_release_tgt_ports(group);
if (group->name)
free(group->name);
free(group);
}
static struct alua_grp *
tcmu_get_alua_grp(struct tcmu_device *dev, const char *name)
{
struct tcmur_device *rdev = tcmu_dev_get_private(dev);
struct alua_grp *group;
struct tgt_port *port;
char *str_val, *orig_str_val, *member;
int val;
group = calloc(1, sizeof(*group));
if (!group)
return NULL;
list_head_init(&group->tgt_ports);
list_node_init(&group->entry);
group->dev = dev;
group->name = strdup(name);
if (!group->name)
goto free_group;
val = tcmu_get_alua_int_setting(group, "alua_access_state");
if (val < 0)
goto free_group;
group->state = val;
val = tcmu_get_alua_int_setting(group, "alua_support_active_nonoptimized");
if (val < 0)
goto free_group;
if (val)
group->supported_states |= ALUA_SUP_NON_OPTIMIZED;
val = tcmu_get_alua_int_setting(group, "alua_support_active_optimized");
if (val < 0)
goto free_group;
if (val)
group->supported_states |= ALUA_SUP_OPTIMIZED;
val = tcmu_get_alua_int_setting(group, "alua_support_lba_dependent");
if (val < 0)
goto free_group;
if (val)
group->supported_states |= ALUA_SUP_LBA_DEPENDENT;
val = tcmu_get_alua_int_setting(group, "alua_support_offline");
if (val < 0)
goto free_group;
if (val)
group->supported_states |= ALUA_SUP_OFFLINE;
val = tcmu_get_alua_int_setting(group, "alua_support_standby");
if (val < 0)
goto free_group;
if (val)
group->supported_states |= ALUA_SUP_STANDBY;
val = tcmu_get_alua_int_setting(group, "alua_support_transitioning");
if (val < 0)
goto free_group;
if (val)
group->supported_states |= ALUA_SUP_TRANSITIONING;
val = tcmu_get_alua_int_setting(group, "alua_support_unavailable");
if (val < 0)
goto free_group;
if (val)
group->supported_states |= ALUA_SUP_UNAVAILABLE;
val = tcmu_get_alua_int_setting(group, "implicit_trans_secs");
if (val < 0)
goto free_group;
group->implicit_trans_secs = val;
val = tcmu_get_alua_int_setting(group, "nonop_delay_msecs");
if (val < 0)
goto free_group;
group->nonop_delay_msecs = val;
val = tcmu_get_alua_int_setting(group, "trans_delay_msecs");
if (val < 0)
goto free_group;
group->trans_delay_msecs = val;
val = tcmu_get_alua_int_setting(group, "tg_pt_gp_id");
if (val < 0)
goto free_group;
group->id = val;
val = tcmu_get_alua_int_setting(group, "preferred");
if (val < 0)
goto free_group;
group->pref = val ? true : false;
str_val = tcmu_get_alua_str_setting(group, "alua_access_status");
if (!str_val)
goto free_group;
if (!strcmp(str_val, "None"))
group->status = ALUA_STAT_NONE;
else if (!strcmp(str_val, "Altered by Explicit STPG"))
group->status = ALUA_STAT_ALTERED_BY_EXPLICIT_STPG;
else if (!strcmp(str_val, "Altered by Implicit ALUA"))
group->status = ALUA_STAT_ALTERED_BY_IMPLICIT_ALUA;
else {
tcmu_dev_err(dev, "Invalid ALUA status %s", str_val);
goto free_str_val;
}
free(str_val);
str_val = tcmu_get_alua_str_setting(group, "alua_access_type");
if (!str_val)
goto free_group;
if (!strcmp(str_val, "None")) {
/*
* Assume user wanted to do active-active.
* We still want the initiator to use RTPG and we
* can manually change states, so report this as
* implicit.
*/
rdev->failover_type = TCMUR_DEV_FAILOVER_ALL_ACTIVE;
group->tpgs = TPGS_ALUA_IMPLICIT;
} else if (!strcmp(str_val, "Implicit")) {
rdev->failover_type = TCMUR_DEV_FAILOVER_IMPLICIT;
group->tpgs = TPGS_ALUA_IMPLICIT;
} else if (!strcmp(str_val, "Explicit")) {
/*
* kernel requires both implicit and explicit so we can
* update the state via configfs.
*/
tcmu_dev_warn(dev, "Unsupported alua_access_type: Explicit only failover not supported.\n");
goto free_str_val;
} else if (!strcmp(str_val, "Implicit and Explicit")) {
/*
* Only report explicit so initiator always sends STPG.
* We only need implicit enabled in the kernel so we can
* interact with the alua configfs interface.
*/
rdev->failover_type = TCMUR_DEV_FAILOVER_EXPLICIT;
group->tpgs = TPGS_ALUA_EXPLICIT;
tcmu_dev_warn(dev, "Unsupported alua_access_type: Implicit and Explicit failover not supported.\n");
goto free_str_val;
} else {
tcmu_dev_err(dev, "Invalid ALUA type %s", str_val);
goto free_str_val;
}
free(str_val);
str_val = orig_str_val = tcmu_get_alua_str_setting(group, "members");
if (str_val) {
while ((member = strsep(&str_val, "\n"))) {
if (!strlen(member))
continue;
port = tcmu_get_tgt_port(member);
if (!port) {
free(orig_str_val);
goto free_group;
}
port->grp = group;
group->num_tgt_ports++;
list_add_tail(&group->tgt_ports, &port->entry);
}
}
free(orig_str_val);
return group;
free_str_val:
free(str_val);
free_group:
tcmu_free_alua_grp(group);
return NULL;
}
void tcmu_release_alua_grps(struct list_head *group_list)
{
struct alua_grp *group, *group_next;
list_for_each_safe(group_list, group, group_next, entry) {
list_del(&group->entry);
tcmu_free_alua_grp(group);
}
}
static int alua_filter(const struct dirent *dir)
{
return strcmp(dir->d_name, ".") && strcmp(dir->d_name, "..");
}
/**
* tcmu_get_alua_grps: Fill group_list with the kernel's port groups.
* @dev: device to get groups for.
* @group_list: list allocated by the caller to add groups to.
*
* User must call tcmu_release_alua_grps when finished with the list of
* groups.
*
* For now, we will only support ALUA if the user has defined groups.
* tcmu ALUA support was added in 4.11, but not all fabric modules support
* it. Depending on the kernel version and tools used we could have:
*
* 1. The default ALUA group, but empty members.
* 2. The default ALUA group, and reading/writing to members will return
* a error or crash the kernel.
* 3. The default ALUA group, and members set to it, but some fabric
* modules did not report the target port group/tag properly so
* we cannot match groups to ports.
*/
int tcmu_get_alua_grps(struct tcmu_device *dev,
struct list_head *group_list)
{
struct alua_grp *group;
struct dirent **namelist;
char path[PATH_MAX];
int i, n;
int ret = 0;
snprintf(path, sizeof(path), CFGFS_CORE"/%s/%s/alua",
dev->tcm_hba_name, dev->tcm_dev_name);
n = scandir(path, &namelist, alua_filter, alphasort);
if (n < 0) {
tcmu_dev_err(dev, "Could not get ALUA dirs for %s:%s\n",
path, strerror(errno));
return -errno;
}
for (i = 0; i < n; i++) {
if (!strcmp(namelist[i]->d_name, "default_tg_pt_gp"))
continue;
group = tcmu_get_alua_grp(dev, namelist[i]->d_name);
if (!group) {
tcmu_dev_err(dev, "Could not get alua group %s.\n", namelist[i]->d_name);
ret = -1;
goto free_groups;
}
list_add_tail(group_list, &group->entry);
}
ret = 0;
goto free_names;
free_groups:
tcmu_release_alua_grps(group_list);
free_names:
for (i = 0; i < n; i++)
free(namelist[i]);
free(namelist);
return ret;
}
/*
* tcmu does not pass up the target port that the command was
* received on, so if a LUN is exported through multiple ports
* in different ALUA target port group we do not know which group
* to use.
*
* For now we support one target port group that contains all
* enabled ports, or for HA configs one local target port group with
* enabled ports and N remote port groups which are marked disabled
* on the the local node.
*/
struct tgt_port *tcmu_get_enabled_port(struct list_head *group_list)
{
struct alua_grp *group;
struct tgt_port *port;
list_for_each(group_list, group, entry) {
list_for_each(&group->tgt_ports, port, entry) {
if (port->enabled)
return port;
}
}
return NULL;
}
static int alua_set_state(struct tcmu_device *dev, struct alua_grp *group,
uint8_t new_state, uint8_t alua_status)
{
int ret;
ret = tcmu_set_alua_int_setting(group, "alua_access_state", new_state);
if (ret) {
tcmu_dev_err(dev, "Could not change kernel state to %u\n",
new_state);
return TCMU_STS_EXPL_TRANSITION_ERR;
}
ret = tcmu_set_alua_int_setting(group, "alua_access_status", alua_status);
if (ret)
/* Ignore. The RTPG status info will be off, but its not used */
tcmu_dev_err(dev, "Could not set alua_access_status for group %s:%d\n",
group->name, group->id);
group->state = new_state;
group->status = alua_status;
return TCMU_STS_OK;
}
/*
* alua_sync_state - update alua and lock state
* @dev: tcmu device
* @group_list: list of alua groups
* @enabled_group_id: group id of the local enabled alua group
*
* If the handler is not able to update the remote nodes's state during ALUA
* transition handling we update it now.
*/
static int alua_sync_state(struct tcmu_device *dev,
struct list_head *group_list,
uint16_t enabled_group_id)
{
struct tcmur_device *rdev = tcmu_dev_get_private(dev);
struct tcmur_handler *rhandler = tcmu_get_runner_handler(dev);
struct alua_grp *group;
uint16_t ao_group_id;
uint8_t alua_state;
int ret;
if (rdev->failover_type == TCMUR_DEV_FAILOVER_IMPLICIT) {
tcmu_update_dev_lock_state(dev);
return TCMU_STS_OK;
}
if (rdev->failover_type != TCMUR_DEV_FAILOVER_EXPLICIT ||
!rhandler->get_lock_tag)
return TCMU_STS_OK;
ret = tcmu_get_lock_tag(dev, &ao_group_id);
if (ret == TCMU_STS_NO_LOCK_HOLDERS) {
ao_group_id = TCMU_INVALID_LOCK_TAG;
} else if (ret != TCMU_STS_OK)
return ret;
list_for_each(group_list, group, entry) {
if (ao_group_id == group->id) {
alua_state = ALUA_ACCESS_STATE_OPTIMIZED;
} else {
alua_state = ALUA_ACCESS_STATE_STANDBY;
if (enabled_group_id == group->id) {
/*
* A node took the lock from us and this is
* the first command sent to us so clear
* lock state to avoid later blacklist errors.
*/
pthread_mutex_lock(&rdev->state_lock);
if (rdev->lock_state == TCMUR_DEV_LOCK_LOCKED) {
tcmu_dev_dbg(dev, "Dropping lock\n");
rdev->lock_state = TCMUR_DEV_LOCK_UNLOCKED;
}
pthread_mutex_unlock(&rdev->state_lock);
}
}
tcmu_dev_dbg(dev, "group %hu old state %u new state %u\n",
group->id, group->state, alua_state);
if (alua_state != group->state)
alua_set_state(dev, group, alua_state,
ALUA_STAT_ALTERED_BY_IMPLICIT_ALUA );
}
return TCMU_STS_OK;
}
int tcmu_emulate_report_tgt_port_grps(struct tcmu_device *dev,
struct list_head *group_list,
struct tcmulib_cmd *cmd)
{
struct alua_grp *group;
struct tgt_port *port, *enabled_port;
int ext_hdr = cmd->cdb[1] & 0x20;
uint32_t off = 4, ret_data_len = 0, ret32;
uint32_t alloc_len = tcmu_cdb_get_xfer_length(cmd->cdb);
uint8_t *buf;
int ret;
enabled_port = tcmu_get_enabled_port(group_list);
if (!enabled_port)
/* unsupported config */
return TCMU_STS_INVALID_CMD;
if (alloc_len < 4)
return TCMU_STS_INVALID_CDB;
buf = calloc(1, alloc_len);
if (!buf)
return TCMU_STS_NO_RESOURCE;
if (ext_hdr && alloc_len > 5) {
buf[4] = 0x10;
/*
* assume all groups will have the same value for now.
*/
group = list_first_entry(group_list, struct alua_grp,
entry);
if (group)
buf[5] = group->implicit_trans_secs;
off = 8;
}
ret = alua_sync_state(dev, group_list, enabled_port->grp->id);
if (ret)
goto free_buf;
list_for_each(group_list, group, entry) {
int next_off = off + 8 + (group->num_tgt_ports * 4);
if (next_off > alloc_len) {
ret_data_len += 8 + (group->num_tgt_ports * 4);
continue;
}
if (group->pref)
buf[off] = 0x80;
buf[off++] |= group->state;
buf[off++] |= group->supported_states;
buf[off++] = (group->id >> 8) & 0xff;
buf[off++] = group->id & 0xff;
/* reserved */
off++;
buf[off++] = group->status;
/* vendor specific */
off++;
buf[off++] = group->num_tgt_ports;
ret_data_len += 8;
list_for_each(&group->tgt_ports, port, entry) {
/* reserved */
off += 2;
buf[off++] = (port->rel_port_id >> 8) & 0xff;
buf[off++] = port->rel_port_id & 0xff;
ret_data_len += 4;
}
}
ret32 = htobe32(ret_data_len);
memcpy(&buf[0], &ret32, 4);
tcmu_memcpy_into_iovec(cmd->iovec, cmd->iov_cnt, buf, alloc_len);
ret = TCMU_STS_OK;
free_buf:
free(buf);
return ret;
}
bool lock_is_required(struct tcmu_device *dev)
{
struct tcmur_handler *rhandler = tcmu_get_runner_handler(dev);
return !!rhandler->lock;
}
static void *alua_lock_thread_fn(void *arg)
{
struct tcmu_device *dev = arg;
tcmu_set_thread_name("alua-lock", dev);
/* TODO: set UA based on bgly's patches */
tcmu_acquire_dev_lock(dev, -1);
return NULL;
}
int alua_implicit_transition(struct tcmu_device *dev, struct tcmulib_cmd *cmd)
{
struct tcmur_device *rdev = tcmu_dev_get_private(dev);
pthread_attr_t attr;
int ret = TCMU_STS_OK;
if (!lock_is_required(dev))
return ret;
pthread_mutex_lock(&rdev->state_lock);
if (rdev->lock_state == TCMUR_DEV_LOCK_LOCKED) {
goto done;
} else if (rdev->lock_state == TCMUR_DEV_LOCK_LOCKING) {
tcmu_dev_dbg(dev, "Lock acquisition operation is already in process.\n");
ret = TCMU_STS_BUSY;
goto done;
}
tcmu_dev_info(dev, "Starting lock acquisition operation.\n");
rdev->lock_state = TCMUR_DEV_LOCK_LOCKING;
/*
* Make the lock_thread as detached to fix the memory leakage bug.
*/
pthread_attr_init(&attr);
pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
/*
* The initiator is going to be queueing commands, so do this
* in the background to avoid command timeouts.
*/
if (pthread_create(&rdev->lock_thread, &attr, alua_lock_thread_fn,
dev)) {
tcmu_dev_err(dev, "Could not start implicit transition thread:%s\n",
strerror(errno));
rdev->lock_state = TCMUR_DEV_LOCK_UNLOCKED;
ret = TCMU_STS_IMPL_TRANSITION_ERR;
} else {
ret = TCMU_STS_BUSY;
}
pthread_attr_destroy(&attr);
done:
pthread_mutex_unlock(&rdev->state_lock);
return ret;
}
static bool alua_check_sup_state(uint8_t state, uint8_t sup)
{
switch (state) {
case ALUA_ACCESS_STATE_OPTIMIZED:
if (sup & ALUA_SUP_OPTIMIZED)
return true;
return false;
case ALUA_ACCESS_STATE_NON_OPTIMIZED:
if (sup & ALUA_SUP_NON_OPTIMIZED)
return true;
return false;
case ALUA_ACCESS_STATE_STANDBY:
if (sup & ALUA_SUP_STANDBY)
return true;
return false;
case ALUA_ACCESS_STATE_UNAVAILABLE:
if (sup & ALUA_SUP_UNAVAILABLE)
return true;
return false;
case ALUA_ACCESS_STATE_OFFLINE:
/*
* TODO: support secondary states
*/
return false;
}
return false;
}
static int tcmu_explicit_transition(struct list_head *group_list,
struct alua_grp *group, uint8_t new_state,
uint8_t alua_status)
{
struct tcmu_device *dev = group->dev;
struct alua_grp *tmp_group;
int ret;
tcmu_dev_dbg(dev, "transition group %u new state %u old state %u sup 0x%x\n",
group->id, new_state, group->state, group->supported_states);
if (!alua_check_sup_state(new_state, group->supported_states))
return TCMU_STS_INVALID_PARAM_LIST;
switch (new_state) {
case ALUA_ACCESS_STATE_OPTIMIZED:
if (!lock_is_required(dev))
/* just change local state */
break;
ret = tcmu_acquire_dev_lock(dev, group->id);
if (ret == TCMU_STS_HW_ERR) {
return TCMU_STS_EXPL_TRANSITION_ERR;
} else if (ret) {
/*
* We should return TCMU_STS_EXPL_TRANSITION_ERR but
* we only get 2 retries for that error in windows 2016.
* Most likely we temporarily couldn't connect to the
* backend and it is dropping the session. Return BUSY
* so this can be retried on another path when
* the session recovery kicks in.
*/
return TCMU_STS_BUSY;
}
/*
* We only support 1 active group, so set everything else
* to standby.
*/
list_for_each(group_list, tmp_group, entry) {
if (group == tmp_group)
continue;
alua_set_state(dev, tmp_group,
ALUA_ACCESS_STATE_STANDBY, alua_status);
}
break;
case ALUA_ACCESS_STATE_NON_OPTIMIZED:
case ALUA_ACCESS_STATE_UNAVAILABLE:
case ALUA_ACCESS_STATE_OFFLINE:
/* TODO we only support standby and AO */
tcmu_dev_err(dev, "Ignoring ANO/unavail/offline\n");
return TCMU_STS_INVALID_PARAM_LIST;
case ALUA_ACCESS_STATE_STANDBY:
if (lock_is_required(dev))
tcmu_release_dev_lock(dev);
break;
default:
return TCMU_STS_INVALID_PARAM_LIST;
}
return alua_set_state(dev, group, new_state, alua_status);
}
int tcmu_emulate_set_tgt_port_grps(struct tcmu_device *dev,
struct list_head *group_list,
struct tcmulib_cmd *cmd)
{
struct alua_grp *group;
struct tgt_port *port;
uint32_t off = 4, param_list_len = tcmu_cdb_get_xfer_length(cmd->cdb);
uint16_t id, tmp_id;
char *buf, new_state;
int found, ret = TCMU_STS_OK;
port = tcmu_get_enabled_port(group_list);
if (!port)
return TCMU_STS_INVALID_CMD;
if (!param_list_len)
return TCMU_STS_OK;
buf = calloc(1, param_list_len);
if (!buf)
return TCMU_STS_NO_RESOURCE;
if (tcmu_memcpy_from_iovec(buf, param_list_len, cmd->iovec,
cmd->iov_cnt) != param_list_len) {
ret = TCMU_STS_INVALID_PARAM_LIST_LEN;
goto free_buf;
}
while (off < param_list_len) {
new_state = buf[off++] & 0x0f;
/* reserved */
off++;
memcpy(&tmp_id, &buf[off], sizeof(tmp_id));
id = be16toh(tmp_id);
off += 2;
found = 0;
list_for_each(group_list, group, entry) {
if (group->id != id)
continue;
if (group != port->grp) {
ret = TCMU_STS_HW_ERR;
tcmu_dev_err(dev, "Failing STPG for group %d. Unable to transition remote groups.\n",
id);
goto free_buf;
}
tcmu_dev_dbg(dev, "Got STPG for group %u\n", id);
ret = tcmu_explicit_transition(group_list, group,
new_state,
ALUA_STAT_ALTERED_BY_EXPLICIT_STPG);
if (ret != TCMU_STS_OK) {
tcmu_dev_err(dev, "Failing STPG for group %d\n",
id);
goto free_buf;
}
found = 1;
break;
}
if (!found) {
/*
* Could not find what error code to return in SCSI
* spec.
*/
tcmu_dev_err(dev, "Could not find group for %u for STPG\n",
id);
ret = TCMU_STS_EXPL_TRANSITION_ERR;
break;
}
}
free_buf:
free(buf);
return ret;
}
int alua_check_state(struct tcmu_device *dev, struct tcmulib_cmd *cmd)
{
struct tcmur_device *rdev = tcmu_dev_get_private(dev);
if (rdev->failover_type == TCMUR_DEV_FAILOVER_EXPLICIT) {
if (rdev->lock_state != TCMUR_DEV_LOCK_LOCKED) {
tcmu_dev_dbg(dev, "device lock not held.\n");
return TCMU_STS_FENCED;
}
} else if (rdev->failover_type == TCMUR_DEV_FAILOVER_IMPLICIT) {
return alua_implicit_transition(dev, cmd);
}
return TCMU_STS_OK;
}