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rbd.c
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rbd.c
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/*
* Copyright 2016, China Mobile, 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 <inttypes.h>
#include <stddef.h>
#include <stdint.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/utsname.h>
#include <fcntl.h>
#include <endian.h>
#include <errno.h>
#include <pthread.h>
#include <scsi/scsi.h>
#include "darray.h"
#include "tcmu-runner.h"
#include "tcmur_cmd_handler.h"
#include "libtcmu.h"
#include "tcmur_device.h"
#include <rbd/librbd.h>
#include <rados/librados.h>
/*
* rbd_lock_acquire exclusive lock support was added in librbd 0.1.11
*/
#if LIBRBD_VERSION_CODE >= LIBRBD_VERSION(0, 1, 11)
#define RBD_LOCK_ACQUIRE_SUPPORT
#endif
/* rbd_aio_discard added in 0.1.2 */
#if LIBRBD_VERSION_CODE >= LIBRBD_VERSION(0, 1, 2)
#define RBD_DISCARD_SUPPORT
#endif
/*
* rbd_aio_writesame support was added in librbd 1.12.0
*/
#if LIBRBD_VERSION_CODE >= LIBRBD_VERSION(1, 12, 0) || LIBRBD_SUPPORTS_WRITESAME
#define RBD_WRITE_SAME_SUPPORT
#endif
/* defined in librbd.h if supported */
#ifdef LIBRBD_SUPPORTS_IOVEC
#if LIBRBD_SUPPORTS_IOVEC
#define RBD_IOVEC_SUPPORT
#endif
#endif
/* defined in librbd.h if supported */
#ifdef LIBRBD_SUPPORTS_COMPARE_AND_WRITE
#if LIBRBD_SUPPORTS_COMPARE_AND_WRITE
#define RBD_COMPARE_AND_WRITE_SUPPORT
#endif
#endif
#define TCMU_RBD_LOCKER_TAG_KEY "tcmu_rbd_locker_tag"
#define TCMU_RBD_LOCKER_TAG_FMT "tcmu_tag=%hu,rbd_client=%s"
#define TCMU_RBD_LOCKER_BUF_LEN 256
struct tcmu_rbd_state {
rados_t cluster;
rados_ioctx_t io_ctx;
rbd_image_t image;
char *image_name;
char *pool_name;
char *osd_op_timeout;
char *conf_path;
char *id;
char *addrs;
};
enum rbd_aio_type {
RBD_AIO_TYPE_WRITE = 0,
RBD_AIO_TYPE_READ,
RBD_AIO_TYPE_CAW
};
struct rbd_aio_cb {
struct tcmu_device *dev;
struct tcmur_cmd *tcmur_cmd;
enum rbd_aio_type type;
union {
struct {
int64_t length;
} read;
struct {
uint64_t offset;
uint64_t miscompare_offset;
} caw;
};
char *bounce_buffer;
struct iovec *iov;
size_t iov_cnt;
};
static pthread_mutex_t blocklist_caches_lock = PTHREAD_MUTEX_INITIALIZER;
static darray(char *) blocklist_caches;
#ifdef LIBRADOS_SUPPORTS_SERVICES
#ifdef RBD_LOCK_ACQUIRE_SUPPORT
static int tcmu_rbd_service_status_update(struct tcmu_device *dev,
bool has_lock)
{
struct tcmu_rbd_state *state = tcmur_dev_get_private(dev);
struct tcmur_device *rdev = tcmu_dev_get_private(dev);
char *status_buf = NULL;
int ret;
ret = asprintf(&status_buf,
"%s%c%s%c%s%c%"PRIu64"%c%s%c%"PRIu64"%c%s%c%"PRIu64"%c",
"lock_owner", '\0', has_lock ? "true" : "false", '\0',
"lock_lost_cnt", '\0', rdev->lock_lost_cnt, '\0',
"conn_lost_cnt", '\0', rdev->conn_lost_cnt, '\0',
"cmd_timed_out_cnt", '\0', rdev->cmd_timed_out_cnt, '\0');
if (ret < 0) {
tcmu_dev_err(dev, "Could not allocate status buf. Service will not be updated.\n");
return ret;
}
ret = rados_service_update_status(state->cluster, status_buf);
if (ret < 0) {
tcmu_dev_err(dev, "Could not update service status. (Err %d)\n",
ret);
}
free(status_buf);
return ret;
}
#endif /* RBD_LOCK_ACQUIRE_SUPPORT */
static int tcmu_rbd_report_event(struct tcmu_device *dev)
{
struct tcmur_device *rdev = tcmu_dev_get_private(dev);
/*
* We ignore the specific event and report all the current counter
* values, because tools like gwcli/dashboard may not see every
* update, and we do not want one event to overwrite the info.
*/
return tcmu_rbd_service_status_update(dev,
rdev->lock_state == TCMUR_DEV_LOCK_WRITE_LOCKED ? true : false);
}
static int tcmu_rbd_service_register(struct tcmu_device *dev)
{
struct tcmu_rbd_state *state = tcmur_dev_get_private(dev);
struct utsname u;
char *daemon_buf = NULL;
char *metadata_buf = NULL;
char *image_id_buf = NULL;
int ret;
ret = uname(&u);
if (ret < 0) {
ret = -errno;
tcmu_dev_err(dev, "Could not query uname. (Err %d)\n", ret);
return ret;
}
image_id_buf = malloc(RBD_MAX_BLOCK_NAME_SIZE);
if (image_id_buf == NULL) {
tcmu_dev_err(dev, "Could not allocate image id buf.\n");
return -ENOMEM;
}
ret = rbd_get_id(state->image, image_id_buf, RBD_MAX_BLOCK_NAME_SIZE);
if (ret < 0) {
tcmu_dev_err(dev, "Could not retrieve image id.\n");
goto free_image_id_buf;
}
ret = asprintf(&daemon_buf, "%s:%s/%s",
u.nodename, state->pool_name, state->image_name);
if (ret < 0) {
tcmu_dev_err(dev, "Could not allocate daemon buf.\n");
ret = -ENOMEM;
goto free_image_id_buf;
}
ret = asprintf(&metadata_buf, "%s%c%s%c%s%c%s%c%s%c%s%c%s%c%s%c%s%c%s%c",
"pool_name", '\0', state->pool_name, '\0',
"image_name", '\0', state->image_name, '\0',
"image_id", '\0', image_id_buf, '\0',
"daemon_type", '\0', "portal", '\0',
"daemon_prefix", '\0', u.nodename, '\0');
if (ret < 0) {
tcmu_dev_err(dev, "Could not allocate metadata buf.\n");
ret = -ENOMEM;
goto free_daemon_buf;
}
ret = rados_service_register(state->cluster, "tcmu-runner",
daemon_buf, metadata_buf);
if (ret < 0) {
tcmu_dev_err(dev, "Could not register service to cluster. (Err %d)\n",
ret);
goto free_meta_buf;
}
ret = tcmu_rbd_report_event(dev);
free_meta_buf:
free(metadata_buf);
free_daemon_buf:
free(daemon_buf);
free_image_id_buf:
free(image_id_buf);
return ret;
}
#else /* LIBRADOS_SUPPORTS_SERVICES */
static int tcmu_rbd_service_register(struct tcmu_device *dev)
{
/* Ignorable. Just log in dbg mode just in case. */
tcmu_dev_dbg(dev, "Ceph service registration not supported.\n");
return 0;
}
#ifdef RBD_LOCK_ACQUIRE_SUPPORT
static int tcmu_rbd_service_status_update(struct tcmu_device *dev,
bool has_lock)
{
return 0;
}
#endif /* RBD_LOCK_ACQUIRE_SUPPORT */
#endif /* LIBRADOS_SUPPORTS_SERVICES */
#if defined LIBRADOS_SUPPORTS_GETADDRS || defined RBD_LOCK_ACQUIRE_SUPPORT
static int tcmu_rbd_remove_blocklist(struct tcmu_device *dev, char *addr)
{
struct tcmu_rbd_state *state = tcmur_dev_get_private(dev);
char *cmd;
int ret;
ret = asprintf(&cmd,
"{\"prefix\": \"osd blocklist\","
"\"blocklistop\": \"rm\","
"\"addr\": \"%s\"}",
addr);
if (ret < 0) {
tcmu_dev_warn(dev, "Could not allocate blocklist rm command. (Err %d)\n",
ret);
return -1;
}
ret = rados_mon_command(state->cluster, (const char**)&cmd, 1, NULL, 0,
NULL, NULL, NULL, NULL);
free(cmd);
if (ret < 0) {
tcmu_dev_dbg(dev, "Could not rm blocklist entry '%s'. (Err %d)\n",
addr, ret);
return 1;
}
return 0;
}
/* Old style */
static int tcmu_rbd_remove_blacklist(struct tcmu_device *dev, char *addr)
{
struct tcmu_rbd_state *state = tcmur_dev_get_private(dev);
char *cmd;
int ret;
ret = asprintf(&cmd,
"{\"prefix\": \"osd blacklist\","
"\"blacklistop\": \"rm\","
"\"addr\": \"%s\"}",
addr);
if (ret < 0) {
tcmu_dev_warn(dev, "Could not allocate blacklist rm command. (Err %d)\n",
ret);
return -1;
}
ret = rados_mon_command(state->cluster, (const char**)&cmd, 1, NULL, 0,
NULL, NULL, NULL, NULL);
free(cmd);
if (ret < 0) {
tcmu_dev_err(dev, "Could not rm blacklist entry '%s'. (Err %d)\n",
addr, ret);
return 1;
}
return 0;
}
static void tcmu_rbd_rm_stale_entry_from_blocklist(struct tcmu_device *dev, char *addrs)
{
const char *p, *q, *end;
char *addr;
int ret;
/*
* Just skip extra chars before '[' if there has
*/
p = strchr(addrs, '[');
if (!p)
p = addrs;
/*
* The addrs will a string like:
* "[192.168.195.172:0/2203456141,192.168.195.172:0/4908756432]"
* Or
* "192.168.195.172:0/2203456141"
*/
while (1) {
if (p == NULL || *p == ']') {
return; /* we are done here */
} else if (*p == '[' || *p == ',') {
/* Skip "[" and white spaces */
while (*p != '\0' && !isalnum(*p)) p++;
if (*p == '\0') {
tcmu_dev_warn(dev, "Get an invalid address '%s'!\n", addrs);
return;
}
end = strchr(p, ',');
if (!end)
end = strchr(p, ']');
if (!end) {
tcmu_dev_warn(dev, "Get an invalid address '%s'!\n", addrs);
return;
}
q = end; /* The *end should be ',' or ']' */
while (*q != '\0' && !isalnum(*q)) q--;
if (*q == '\0') {
tcmu_dev_warn(dev, "Get an invalid address '%s'!\n", addrs);
return;
}
addr = strndup(p, q - p + 1);
p = end;
} else {
/* In case of "192.168.195.172:0/2203456141" */
addr = strdup(p);
p = NULL;
}
ret = tcmu_rbd_remove_blocklist(dev, addr);
if (ret > 0)
ret = tcmu_rbd_remove_blacklist(dev, addr);
free(addr);
if (ret)
return;
}
}
static int tcmu_rbd_rm_stale_entries_from_blocklist(struct tcmu_device *dev)
{
char **entry, *tmp_entry;
int ret = 0;
int i;
pthread_mutex_lock(&blocklist_caches_lock);
if (darray_empty(blocklist_caches))
goto unlock;
/* Try to remove all the stale blocklist entities */
darray_foreach(entry, blocklist_caches) {
tcmu_dev_info(dev, "removing blocklist entry: {%s}\n", *entry);
tcmu_rbd_rm_stale_entry_from_blocklist(dev, *entry);
}
unlock:
for (i = darray_size(blocklist_caches) - 1; i >= 0; i--) {
tmp_entry = darray_item(blocklist_caches, i);
darray_remove(blocklist_caches, i);
free(tmp_entry);
}
pthread_mutex_unlock(&blocklist_caches_lock);
return ret;
}
#endif // LIBRADOS_SUPPORTS_GETADDRS || RBD_LOCK_ACQUIRE_SUPPORT
static char *tcmu_rbd_find_quote(char *string)
{
/* ignore escaped quotes */
while (true) {
string = strpbrk(string, "\"\\");
if (!string) {
break;
}
if (*string == '"') {
break;
}
if (*++string == '\0') {
break;
}
/* skip past the escaped character */
++string;
}
return string;
}
static bool tcmu_rbd_match_device_class(struct tcmu_device *dev,
const char *crush_rule,
const char *device_class)
{
struct tcmu_rbd_state *state = tcmur_dev_get_private(dev);
char *mon_cmd_bufs[2] = {NULL, NULL};
char *mon_buf = NULL, *mon_status_buf = NULL;
size_t mon_buf_len = 0, mon_status_buf_len = 0;
int ret;
bool match = false;
/* request a list of crush rules associated to the device class */
ret = asprintf(&mon_cmd_bufs[0],
"{\"prefix\": \"osd crush rule ls-by-class\", "
"\"class\": \"%s\", \"format\": \"json\"}",
device_class);
if (ret < 0) {
tcmu_dev_warn(dev, "Could not allocate crush rule ls-by-class command.\n");
return false;
}
ret = rados_mon_command(state->cluster, (const char **)mon_cmd_bufs, 1,
"", 0, &mon_buf, &mon_buf_len,
&mon_status_buf, &mon_status_buf_len);
free(mon_cmd_bufs[0]);
if (ret == -ENOENT) {
tcmu_dev_dbg(dev, "%s not a registered device class.\n", device_class);
return false;
} else if (ret < 0 || !mon_buf) {
tcmu_dev_warn(dev, "Could not retrieve pool crush rule ls-by-class (Err %d)\n",
ret);
return false;
}
rados_buffer_free(mon_status_buf);
/* expected JSON output: ["<rule name>",["<rule name>"...]] */
mon_buf[mon_buf_len - 1] = '\0';
match = (strstr(mon_buf, crush_rule) != NULL);
rados_buffer_free(mon_buf);
return match;
}
static void tcmu_rbd_detect_device_class(struct tcmu_device *dev)
{
struct tcmu_rbd_state *state = tcmur_dev_get_private(dev);
char *mon_cmd_bufs[2] = {NULL, NULL};
char *mon_buf = NULL, *mon_status_buf = NULL;
size_t mon_buf_len = 0, mon_status_buf_len = 0;
char *crush_rule = NULL, *crush_rule_end = NULL;
int ret;
/* request the crush rule name for the image's pool */
ret = asprintf(&mon_cmd_bufs[0],
"{\"prefix\": \"osd pool get\", "
"\"pool\": \"%s\", "
"\"var\": \"crush_rule\", "
"\"format\": \"json\"}", state->pool_name);
if (ret < 0) {
tcmu_dev_warn(dev, "Could not allocate crush rule command.\n");
return;
}
ret = rados_mon_command(state->cluster, (const char **)mon_cmd_bufs, 1,
"", 0, &mon_buf, &mon_buf_len,
&mon_status_buf, &mon_status_buf_len);
free(mon_cmd_bufs[0]);
if (ret < 0 || !mon_buf) {
tcmu_dev_warn(dev, "Could not retrieve pool crush rule (Err %d)\n",
ret);
return;
}
rados_buffer_free(mon_status_buf);
/* expected JSON output: "{..."crush_rule":"<rule name>"...}" */
mon_buf[mon_buf_len - 1] = '\0';
crush_rule = strstr(mon_buf, "\"crush_rule\":\"");
if (!crush_rule) {
tcmu_dev_warn(dev, "Could not locate crush rule key\n");
rados_buffer_free(mon_buf);
return;
}
/* skip past key to the start of the quoted rule name */
crush_rule += 13;
crush_rule_end = tcmu_rbd_find_quote(crush_rule + 1);
if (!crush_rule_end) {
tcmu_dev_warn(dev, "Could not extract crush rule\n");
rados_buffer_free(mon_buf);
return;
}
*(crush_rule_end + 1) = '\0';
crush_rule = strdup(crush_rule);
rados_buffer_free(mon_buf);
tcmu_dev_dbg(dev, "Pool %s using crush rule %s\n", state->pool_name,
crush_rule);
if (tcmu_rbd_match_device_class(dev, crush_rule, "ssd") ||
tcmu_rbd_match_device_class(dev, crush_rule, "nvme")) {
tcmu_dev_dbg(dev, "Pool %s associated to solid state device class.\n",
state->pool_name);
tcmu_dev_set_solid_state_media(dev, true);
}
free(crush_rule);
}
static void tcmu_rbd_image_close(struct tcmu_device *dev)
{
struct tcmu_rbd_state *state = tcmur_dev_get_private(dev);
rbd_close(state->image);
rados_ioctx_destroy(state->io_ctx);
rados_shutdown(state->cluster);
state->cluster = NULL;
state->io_ctx = NULL;
state->image = NULL;
}
static int timer_check_and_set_def(struct tcmu_device *dev)
{
struct tcmu_rbd_state *state = tcmur_dev_get_private(dev);
char buf[128];
int grace, interval, ret, len;
float timeout;
ret = rados_conf_get(state->cluster, "osd_heartbeat_grace",
buf, 128);
if (ret) {
tcmu_dev_err(dev, "Failed to get cluster's default osd_heartbeat_grace\n");
return ret;
}
grace = atoi(buf);
ret = rados_conf_get(state->cluster, "osd_heartbeat_interval",
buf, 128);
if (ret) {
tcmu_dev_err(dev, "Failed to get cluster's default osd_heartbeat_interval\n");
return ret;
}
interval = atoi(buf);
ret = rados_conf_get(state->cluster, "rados_osd_op_timeout",
buf, 128);
if (ret) {
tcmu_dev_err(dev, "Failed to get cluster's default rados_osd_op_timeout\n");
return ret;
}
timeout = atof(buf);
tcmu_dev_dbg(dev, "The cluster's default osd op timeout(%f), osd heartbeat grace(%d) interval(%d)\n",
timeout, grace, interval);
/* Frist: Try to use new osd op timeout value */
if (state->osd_op_timeout && atof(state->osd_op_timeout) > grace + interval)
goto set;
/* Second: Try to use the default osd op timeout value as read from the cluster */
if (timeout > grace + interval) {
tcmu_dev_dbg(dev, "The osd op timeout will remain the default value: %f\n", timeout);
return 0;
}
tcmu_dev_warn(dev, "osd op timeout (%s) must be larger than osd heartbeat grace (%d) + interval (%d)!\n",
state->osd_op_timeout, grace, interval);
/*
* At last: Set the default rados_osd_op_timeout to grace + interval + 5
* to make sure rados_osd_op_timeout > grace + interval.
*/
len = sprintf(buf, "%d", grace + interval + 5);
buf[len] = '\0';
if (state->osd_op_timeout)
free(state->osd_op_timeout);
state->osd_op_timeout = strdup(buf);
if (!state->osd_op_timeout) {
tcmu_dev_err(dev, "Failed to alloc memory for ->osd_op_timeout\n");
return -ENOMEM;
}
tcmu_dev_warn(dev, "Will set the osd op timeout to %s instead!\n",
state->osd_op_timeout);
set:
return rados_conf_set(state->cluster, "rados_osd_op_timeout",
state->osd_op_timeout);
}
static int tcmu_rbd_image_open(struct tcmu_device *dev)
{
struct tcmu_rbd_state *state = tcmur_dev_get_private(dev);
int ret;
ret = rados_create(&state->cluster, state->id);
if (ret < 0) {
tcmu_dev_err(dev, "Could not create cluster. (Err %d)\n", ret);
return ret;
}
/* Try default location when conf_path=NULL, but ignore failure */
ret = rados_conf_read_file(state->cluster, state->conf_path);
if (state->conf_path && ret < 0) {
tcmu_dev_err(dev, "Could not read config %s (Err %d)",
state->conf_path, ret);
goto rados_shutdown;
}
rados_conf_set(state->cluster, "rbd_cache", "false");
ret = timer_check_and_set_def(dev);
if (ret)
tcmu_dev_warn(dev,
"Could not set rados osd op timeout to %s (Err %d. Failover may be delayed.)\n",
state->osd_op_timeout, ret);
ret = rados_connect(state->cluster);
if (ret < 0) {
tcmu_dev_err(dev, "Could not connect to cluster. (Err %d)\n",
ret);
goto rados_shutdown;
}
tcmu_rbd_detect_device_class(dev);
ret = rados_ioctx_create(state->cluster, state->pool_name,
&state->io_ctx);
if (ret < 0) {
tcmu_dev_err(dev, "Could not create ioctx for pool %s. (Err %d)\n",
state->pool_name, ret);
goto rados_shutdown;
}
ret = rbd_open(state->io_ctx, state->image_name, &state->image, NULL);
if (ret < 0) {
tcmu_dev_err(dev, "Could not open image %s. (Err %d)\n",
state->image_name, ret);
goto rados_destroy;
}
ret = tcmu_rbd_service_register(dev);
if (ret < 0)
goto rbd_close;
return 0;
rbd_close:
rbd_close(state->image);
state->image = NULL;
rados_destroy:
rados_ioctx_destroy(state->io_ctx);
state->io_ctx = NULL;
rados_shutdown:
rados_shutdown(state->cluster);
state->cluster = NULL;
return ret;
}
#ifdef RBD_LOCK_ACQUIRE_SUPPORT
/*
* Returns:
* 0 = client is not owner.
* 1 = client is owner.
* -ESHUTDOWN/-EBLOCKLISTED(-108) = client is blocklisted.
* -ETIMEDOUT = rados osd op timeout has expired.
* -EIO = misc error.
*/
static int tcmu_rbd_has_lock(struct tcmu_device *dev)
{
struct tcmu_rbd_state *state = tcmur_dev_get_private(dev);
int ret, is_owner;
ret = rbd_is_exclusive_lock_owner(state->image, &is_owner);
if (ret < 0) {
if (ret == -ESHUTDOWN) {
tcmu_dev_dbg(dev, "Client is blocklisted. Could not check lock ownership.\n");
} else {
tcmu_dev_err(dev, "Could not check lock ownership. Error: %s.\n",
strerror(-ret));
}
if (ret == -ESHUTDOWN || ret == -ETIMEDOUT)
return ret;
/* let initiator figure things out */
return -EIO;
} else if (is_owner) {
tcmu_dev_dbg(dev, "Is owner\n");
return 1;
}
tcmu_dev_dbg(dev, "Not owner\n");
return 0;
}
static int tcmu_rbd_get_lock_state(struct tcmu_device *dev)
{
int ret;
ret = tcmu_rbd_has_lock(dev);
if (ret == 1)
return TCMUR_DEV_LOCK_WRITE_LOCKED;
else if (ret == 0 || ret == -ESHUTDOWN)
return TCMUR_DEV_LOCK_UNLOCKED;
else
return TCMUR_DEV_LOCK_UNKNOWN;
}
/**
* tcmu_rbd_lock_break - break rbd exclusive lock if needed
* @dev: device to break the lock for.
*
* Returns:
* 0 = lock has been broken.
* -ETIMEDOUT = could not complete operation in rados osd op timeout seconds.
* -Ezyx = misc failure.
*/
static int tcmu_rbd_lock_break(struct tcmu_device *dev)
{
struct tcmu_rbd_state *state = tcmur_dev_get_private(dev);
rbd_lock_mode_t lock_mode;
char *owners[1];
size_t num_owners = 1;
int ret;
ret = rbd_lock_get_owners(state->image, &lock_mode, owners,
&num_owners);
if (ret == -ENOENT || (!ret && !num_owners))
return 0;
if (ret < 0) {
tcmu_dev_err(dev, "Could not get lock owners to break lock %d\n",
ret);
return ret;
}
if (lock_mode != RBD_LOCK_MODE_EXCLUSIVE) {
tcmu_dev_err(dev, "Invalid lock type (%d) found\n", lock_mode);
ret = -EIO;
goto free_owners;
}
tcmu_dev_dbg(dev, "Attempting to break lock from %s.\n", owners[0]);
ret = rbd_lock_break(state->image, lock_mode, owners[0]);
if (ret < 0)
tcmu_dev_err(dev, "Could not break lock from %s. (Err %d)\n",
owners[0], ret);
free_owners:
rbd_lock_get_owners_cleanup(owners, num_owners);
return ret;
}
static int tcmu_rbd_to_sts(int rc)
{
switch (rc) {
case 0:
return TCMU_STS_OK;
case -ESHUTDOWN:
return TCMU_STS_FENCED;
case -ENOENT:
return TCMU_STS_NO_LOCK_HOLDERS;
case -ETIMEDOUT:
return TCMU_STS_TIMEOUT;
case -ENOMEM:
return TCMU_STS_NO_RESOURCE;
default:
return TCMU_STS_HW_ERR;
}
}
static int tcmu_rbd_get_lock_tag(struct tcmu_device *dev, uint16_t *tag)
{
struct tcmu_rbd_state *state = tcmur_dev_get_private(dev);
char *metadata_owner, *owners[1];
size_t num_owners = 1;
rbd_lock_mode_t lock_mode;
char buf[TCMU_RBD_LOCKER_BUF_LEN];
size_t buf_len = TCMU_RBD_LOCKER_BUF_LEN;
int ret;
memset(buf, 0, buf_len);
ret = rbd_metadata_get(state->image, TCMU_RBD_LOCKER_TAG_KEY,
buf, &buf_len);
tcmu_dev_dbg(dev, "get meta got %d %s\n", ret, buf);
if (ret)
goto done;
ret = rbd_lock_get_owners(state->image, &lock_mode, owners,
&num_owners);
tcmu_dev_dbg(dev, "get lockowner got %d\n", ret);
if (ret)
goto done;
if (!num_owners) {
/* there would be stale metadata due to a crash */
ret = -ENOENT;
goto done;
}
metadata_owner = strstr(buf, "rbd_client=");
if (!metadata_owner) {
tcmu_dev_err(dev, "Invalid lock tag %s.\n", buf);
/* Force initiator to retry STPG */
ret = -ENOENT;
goto free_owners;
}
metadata_owner += 11;
if (strcmp(metadata_owner, owners[0])) {
tcmu_dev_dbg(dev, "owner mismatch %s %s\n", metadata_owner,
owners[0]);
/*
* A node could be in the middle of grabbing the lock or it
* failed midway. Force tcmu to report all standby so the
* initiator retries the STPG for the failure case.
*/
ret = -ENOENT;
goto free_owners;
}
ret = sscanf(buf, "tcmu_tag=%hu,%*s", tag);
if (ret != 1) {
tcmu_dev_err(dev, "Invalid lock tag %s.\n", buf);
/* Force initiator to retry STPG */
ret = -ENOENT;
goto free_owners;
}
ret = 0;
free_owners:
if (num_owners)
rbd_lock_get_owners_cleanup(owners, num_owners);
done:
return tcmu_rbd_to_sts(ret);
}
static int tcmu_rbd_set_lock_tag(struct tcmu_device *dev, uint16_t tcmu_tag)
{
struct tcmu_rbd_state *state = tcmur_dev_get_private(dev);
rbd_lock_mode_t lock_mode;
char *owners[1];
size_t num_owners = 1;
char *tcmu_rbd_tag;
int ret;
/*
* We cannot take the lock and set the tag atomically. In case
* we fail here and are in an inconsistent state, we attach the rbd
* client lock info along with the tcmu locker tag so remote nodes
* can check the rbd info against rbd_lock_get_owners to determine if
* the tcmu locker tag is current/valid.
*/
ret = rbd_lock_get_owners(state->image, &lock_mode, owners,
&num_owners);
tcmu_dev_dbg(dev, "set tag get lockowner got %d %zd\n", ret, num_owners);
if (ret)
return ret;
if (!num_owners)
return -ENOENT;
ret = asprintf(&tcmu_rbd_tag, TCMU_RBD_LOCKER_TAG_FMT, tcmu_tag,
owners[0]);
if (ret < 0) {
ret = -ENOMEM;
goto free_owners;
}
ret = rbd_metadata_set(state->image, TCMU_RBD_LOCKER_TAG_KEY,
tcmu_rbd_tag);
free(tcmu_rbd_tag);
if (ret)
tcmu_dev_err(dev, "Could not store lock tag. Err %d.\n", ret);
free_owners:
if (num_owners)
rbd_lock_get_owners_cleanup(owners, num_owners);
return ret;
}
static int tcmu_rbd_unlock(struct tcmu_device *dev)
{
struct tcmu_rbd_state *state = tcmur_dev_get_private(dev);
int ret;
ret = tcmu_rbd_has_lock(dev);
if (ret == 0)
return TCMU_STS_OK;
else if (ret < 0)
return tcmu_rbd_to_sts(ret);
ret = rbd_lock_release(state->image);
if (!ret)
return TCMU_STS_OK;
tcmu_dev_err(dev, "Could not release lock. Err %d.\n", ret);
return tcmu_rbd_to_sts(ret);
}
static int tcmu_rbd_lock(struct tcmu_device *dev, uint16_t tag)
{
struct tcmu_rbd_state *state = tcmur_dev_get_private(dev);
#if !defined LIBRADOS_SUPPORTS_GETADDRS && defined RBD_LOCK_ACQUIRE_SUPPORT
rbd_lock_mode_t lock_mode;
char *owners1[1], *owners2[1];
size_t num_owners1 = 1, num_owners2 = 1;
#endif
int ret;
ret = tcmu_rbd_has_lock(dev);
if (ret == 1) {
ret = 0;
/*
* We might have failed after getting the lock, but
* before we set the meta data.
*/
goto set_lock_tag;
} else if (ret)
goto done;
ret = tcmu_rbd_lock_break(dev);
if (ret)
goto done;
ret = rbd_lock_acquire(state->image, RBD_LOCK_MODE_EXCLUSIVE);
if (ret)
goto done;
#if !defined LIBRADOS_SUPPORTS_GETADDRS && defined RBD_LOCK_ACQUIRE_SUPPORT
ret = rbd_lock_get_owners(state->image, &lock_mode, owners1,
&num_owners1);
if ((!ret && !num_owners1) || ret < 0) {
tcmu_dev_warn(dev, "Could not get lock owners to store blocklist entry %d!\n",
ret);
} else {
int is_owner;
/* To check whether we are still the lock owner */
ret = rbd_is_exclusive_lock_owner(state->image, &is_owner);
if (ret) {
rbd_lock_get_owners_cleanup(owners1, num_owners1);
tcmu_dev_warn(dev, "Could not check lock owners to store blocklist entry %d!\n",
ret);
goto no_owner;
}
/* To get the lock owner again */
ret = rbd_lock_get_owners(state->image, &lock_mode, owners2,
&num_owners2);
if ((!ret && !num_owners2) || ret < 0) {
tcmu_dev_warn(dev, "Could not get lock owners to store blocklist entry %d!\n",
ret);
/* Only we didn't lose the lock during the above check will we store the blocklist list */
} else if (!strcmp(owners1[0], owners2[0]) && is_owner) {
state->addrs = strdup(owners1[0]); // ignore the errors
}
rbd_lock_get_owners_cleanup(owners1, num_owners1);
rbd_lock_get_owners_cleanup(owners2, num_owners2);
}
no_owner:
#endif
set_lock_tag:
tcmu_dev_info(dev, "Acquired exclusive lock.\n");
if (tag != TCMU_INVALID_LOCK_TAG)
ret = tcmu_rbd_set_lock_tag(dev, tag);
done:
tcmu_rbd_service_status_update(dev, ret == 0 ? true : false);
return tcmu_rbd_to_sts(ret);
}
static void tcmu_rbd_check_excl_lock_enabled(struct tcmu_device *dev)
{
struct tcmu_rbd_state *state = tcmur_dev_get_private(dev);
uint64_t features = 0;