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rbd.c
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/*
* Copyright 2016, China Mobile, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License. You may obtain
* a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*/
#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 "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
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;
};
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 tcmulib_cmd *tcmulib_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;
};
#ifdef LIBRADOS_SUPPORTS_SERVICES
#ifdef RBD_LOCK_ACQUIRE_SUPPORT
static void tcmu_rbd_service_status_update(struct tcmu_device *dev,
bool has_lock)
{
struct tcmu_rbd_state *state = tcmu_get_dev_private(dev);
char *status_buf = NULL;
int ret;
ret = asprintf(&status_buf, "%s%c%s%c", "lock_owner", '\0',
has_lock ? "true" : "false", '\0');
if (ret < 0) {
tcmu_dev_err(dev, "Could not allocate status buf. Service will not be updated.\n");
return;
}
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);
}
#endif /* RBD_LOCK_ACQUIRE_SUPPORT */
static int tcmu_rbd_service_register(struct tcmu_device *dev)
{
struct tcmu_rbd_state *state = tcmu_get_dev_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",
"pool_name", '\0', state->pool_name, '\0',
"image_name", '\0', state->image_name, '\0',
"image_id", '\0', image_id_buf, '\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);
}
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 void tcmu_rbd_service_status_update(struct tcmu_device *dev,
bool has_lock)
{
}
#endif /* RBD_LOCK_ACQUIRE_SUPPORT */
#endif /* LIBRADOS_SUPPORTS_SERVICES */
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 void tcmu_rbd_detect_device_class(struct tcmu_device *dev)
{
struct tcmu_rbd_state *state = tcmu_get_dev_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] = '\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);
/* request a list of crush rules associated to SSD device class */
ret = asprintf(&mon_cmd_bufs[0],
"{\"prefix\": \"osd crush rule ls-by-class\", "
"\"class\": \"ssd\", \"format\": \"json\"}");
if (ret < 0) {
tcmu_dev_warn(dev, "Could not allocate crush rule ls-by-class command.\n");
goto free_crush_rule;
}
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, "SSD not a registered device class.\n");
goto free_crush_rule;
} else if (ret < 0 || !mon_buf) {
tcmu_dev_warn(dev, "Could not retrieve pool crush rule ls-by-class (Err %d)\n",
ret);
goto free_crush_rule;
}
rados_buffer_free(mon_status_buf);
/* expected JSON output: ["<rule name>",["<rule name>"...]] */
mon_buf[mon_buf_len] = '\0';
if (strstr(mon_buf, crush_rule)) {
tcmu_dev_dbg(dev, "Pool %s associated to SSD device class.\n",
state->pool_name);
tcmu_set_dev_solid_state_media(dev, true);
}
rados_buffer_free(mon_buf);
free_crush_rule:
free(crush_rule);
}
static void tcmu_rbd_image_close(struct tcmu_device *dev)
{
struct tcmu_rbd_state *state = tcmu_get_dev_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 = tcmu_get_dev_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 = tcmu_get_dev_private(dev);
int ret;
ret = rados_create(&state->cluster, NULL);
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/-EBLACKLISTED(-108) = client is blacklisted.
* -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 = tcmu_get_dev_private(dev);
int ret, is_owner;
ret = rbd_is_exclusive_lock_owner(state->image, &is_owner);
if (ret == -ESHUTDOWN || ret == -ETIMEDOUT) {
return ret;
} else if (ret < 0) {
/* let initiator figure things out */
tcmu_dev_err(dev, "Could not check lock ownership. (Err %d).\n", ret);
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_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.
* @orig_owner: if non null, only break the lock if get owners matches
*
* If orig_owner is null and tcmu_rbd_lock_break fails to break the lock
* for a retryable error (-EAGAIN) the owner of the lock will be returned.
* The caller must free the string returned.
*
* Returns:
* 0 = lock has been broken.
* -EAGAIN = retryable error
* -ETIMEDOUT = could not complete operation in rados osd op timeout seconds.
* -EIO = hard failure.
*/
static int tcmu_rbd_lock_break(struct tcmu_device *dev, char **orig_owner)
{
struct tcmu_rbd_state *state = tcmu_get_dev_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 %d\n", ret);
if (ret == -ETIMEDOUT)
return ret;
else
return -EAGAIN;
}
if (lock_mode != RBD_LOCK_MODE_EXCLUSIVE) {
tcmu_dev_err(dev, "Invalid lock type (%d) found\n", lock_mode);
ret = -EIO;
goto free_owners;
}
if (*orig_owner && strcmp(*orig_owner, owners[0])) {
/* someone took the lock while we were retrying */
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);
if (ret == -ETIMEDOUT)
goto free_owners;
ret = -EAGAIN;
if (!*orig_owner) {
*orig_owner = strdup(owners[0]);
if (!*orig_owner)
ret = -EIO;
}
}
free_owners:
rbd_lock_get_owners_cleanup(owners, num_owners);
return ret;
}
static int tcmu_rbd_lock(struct tcmu_device *dev)
{
struct tcmu_rbd_state *state = tcmu_get_dev_private(dev);
int ret = 0, attempts = 0;
char *orig_owner = NULL;
/*
* TODO: Add retry/timeout settings to handle windows/ESX.
* Or, set to transitioning and grab the lock in the background.
*/
while (attempts++ < 5) {
ret = tcmu_rbd_has_lock(dev);
if (ret == 1) {
ret = 0;
break;
} else if (ret == -ETIMEDOUT || ret == -ESHUTDOWN) {
break;
} else if (ret < 0) {
sleep(1);
continue;
}
ret = tcmu_rbd_lock_break(dev, &orig_owner);
if (ret == -EIO || ret == -ETIMEDOUT) {
break;
} else if (ret == -EAGAIN) {
sleep(1);
continue;
}
ret = rbd_lock_acquire(state->image, RBD_LOCK_MODE_EXCLUSIVE);
if (!ret) {
tcmu_dev_warn(dev, "Acquired exclusive lock.\n");
break;
} else if (ret == -ETIMEDOUT) {
break;
}
tcmu_dev_err(dev, "Unknown error %d while trying to acquire lock.\n",
ret);
}
if (orig_owner)
free(orig_owner);
switch (ret) {
case 0:
ret = TCMUR_LOCK_SUCCESS;
break;
case -ETIMEDOUT:
ret = TCMUR_LOCK_NOTCONN;
break;
case -ESHUTDOWN:
ret = TCMUR_LOCK_BLACKLISTED;
break;
default:
ret = TCMUR_LOCK_FAILED;
}
tcmu_rbd_service_status_update(dev, ret == TCMUR_LOCK_SUCCESS ?
true : false);
return ret;
}
static void tcmu_rbd_check_excl_lock_enabled(struct tcmu_device *dev)
{
struct tcmu_rbd_state *state = tcmu_get_dev_private(dev);
uint64_t features = 0;
int ret;
ret = rbd_get_features(state->image, &features);
if (ret) {
tcmu_dev_warn(dev, "Could not get rbd features. HA may not be supported. Err %d.\n", ret);
return;
}
if (!(features & RBD_FEATURE_EXCLUSIVE_LOCK)) {
tcmu_dev_warn(dev, "exclusive-lock not enabled for image. HA not supported.\n");
}
}
#else /* RBD_LOCK_ACQUIRE_SUPPORT */
static void tcmu_rbd_check_excl_lock_enabled(struct tcmu_device *dev)
{
tcmu_dev_warn(dev, "HA not supported.\n");
}
#endif /* RBD_LOCK_ACQUIRE_SUPPORT */
static void tcmu_rbd_state_free(struct tcmu_rbd_state *state)
{
if (state->conf_path)
free(state->conf_path);
if (state->osd_op_timeout)
free(state->osd_op_timeout);
if (state->image_name)
free(state->image_name);
if (state->pool_name)
free(state->pool_name);
free(state);
}
static int tcmu_rbd_check_image_size(struct tcmu_device *dev, uint64_t new_size)
{
struct tcmu_rbd_state *state = tcmu_get_dev_private(dev);
uint64_t rbd_size;
int ret;
ret = rbd_get_size(state->image, &rbd_size);
if (ret < 0) {
tcmu_dev_err(dev, "Could not get rbd size from cluster. Err %d.\n",
ret);
return ret;
}
if (new_size != rbd_size) {
tcmu_dev_err(dev, "Mismatched sizes. RBD image size %" PRIu64 ". Requested new size %" PRIu64 ".\n",
rbd_size, new_size);
return -EINVAL;
}
return 0;
}
static int tcmu_rbd_open(struct tcmu_device *dev)
{
rbd_image_info_t image_info;
char *pool, *name, *next_opt;
char *config, *dev_cfg_dup;
struct tcmu_rbd_state *state;
int ret;
state = calloc(1, sizeof(*state));
if (!state)
return -ENOMEM;
tcmu_set_dev_private(dev, state);
dev_cfg_dup = strdup(tcmu_get_dev_cfgstring(dev));
config = dev_cfg_dup;
if (!config) {
ret = -ENOMEM;
goto free_state;
}
tcmu_dev_dbg(dev, "tcmu_rbd_open config %s block size %u num lbas %" PRIu64 ".\n",
config, tcmu_get_dev_block_size(dev),
tcmu_get_dev_num_lbas(dev));
config = strchr(config, '/');
if (!config) {
tcmu_dev_err(dev, "no configuration found in cfgstring\n");
ret = -EINVAL;
goto free_config;
}
config += 1; /* get past '/' */
pool = strtok(config, "/");
if (!pool) {
tcmu_dev_err(dev, "Could not get pool name\n");
ret = -EINVAL;
goto free_config;
}
state->pool_name = strdup(pool);
if (!state->pool_name) {
ret = -ENOMEM;
tcmu_dev_err(dev, "Could not copy pool name\n");
goto free_config;
}
name = strtok(NULL, ";");
if (!name) {
tcmu_dev_err(dev, "Could not get image name\n");
ret = -EINVAL;
goto free_config;
}
state->image_name = strdup(name);
if (!state->image_name) {
ret = -ENOMEM;
tcmu_dev_err(dev, "Could not copy image name\n");
goto free_config;
}
/* The next options are optional */
next_opt = strtok(NULL, ";");
if (next_opt) {
if (!strncmp(next_opt, "osd_op_timeout=", 15)) {
state->osd_op_timeout = strdup(next_opt + 15);
if (!state->osd_op_timeout ||
!strlen(state->osd_op_timeout)) {
ret = -ENOMEM;
tcmu_dev_err(dev, "Could not copy osd op timeout.\n");
goto free_config;
}
} else if (strncmp(next_opt, "conf=", 5)) {
state->conf_path = strdup(next_opt + 5);
if (!state->conf_path || !strlen(state->conf_path)) {
ret = -ENOMEM;
tcmu_dev_err(dev, "Could not copy conf path.\n");
goto free_config;
}
}
}
ret = tcmu_rbd_image_open(dev);
if (ret < 0) {
goto free_config;
}
tcmu_rbd_check_excl_lock_enabled(dev);
ret = tcmu_rbd_check_image_size(dev, tcmu_get_dev_block_size(dev) *
tcmu_get_dev_num_lbas(dev));
if (ret) {
goto stop_image;
}
ret = rbd_stat(state->image, &image_info, sizeof(image_info));
if (ret < 0) {
tcmu_dev_err(dev, "Could not stat image.\n");
goto stop_image;
}
tcmu_set_dev_write_cache_enabled(dev, 0);
free(dev_cfg_dup);
return 0;
stop_image:
tcmu_rbd_image_close(dev);
free_config:
free(dev_cfg_dup);
free_state:
tcmu_rbd_state_free(state);
return ret;
}
static void tcmu_rbd_close(struct tcmu_device *dev)
{
struct tcmu_rbd_state *state = tcmu_get_dev_private(dev);
tcmu_rbd_image_close(dev);
tcmu_rbd_state_free(state);
}
static int tcmu_rbd_handle_blacklisted_cmd(struct tcmu_device *dev,
struct tcmulib_cmd *cmd)
{
tcmu_notify_lock_lost(dev);
/*
* This will happen during failback normally, because
* running IO is failed due to librbd's immediate blacklisting
* during lock acquisition on a higher priority path.
*/
return tcmu_set_sense_data(cmd->sense_buf, NOT_READY,
ASC_STATE_TRANSITION, NULL);
}
/*
* TODO: Check timers.
* The rados osd op timeout must be longer than the timeouts to detect
* unreachable OSDs (osd heartbeat grace + osd heartbeat interval) or
* we will end up failing the transport connection when we just needed
* to try a different OSD.
*/
static int tcmu_rbd_handle_timedout_cmd(struct tcmu_device *dev,
struct tcmulib_cmd *cmd)
{
tcmu_dev_err(dev, "Timing out cmd.\n");
tcmu_notify_conn_lost(dev);
/*
* TODO: For AA, we will want to kill the ceph tcp connections
* with LINGER on and set to 0, so there are no TCP retries,
* and we need something on the OSD side to drop requests
* that end up reaching it after the initiator's failover/recovery
* timeout. For implicit and explicit FO, we will just disable
* the iscsi port, and let the initiator switch paths which will
* result in us getting blacklisted, so fail with a retryable
* error.
*/
return SAM_STAT_BUSY;
}
#ifdef RBD_IOVEC_SUPPORT
static rbd_image_t tcmu_dev_to_image(struct tcmu_device *dev)
{
struct tcmu_rbd_state *state = tcmu_get_dev_private(dev);
return state->image;
}
#define tcmu_rbd_aio_read(dev, aio_cb, completion, iov, iov_cnt, length, offset) \
rbd_aio_readv(tcmu_dev_to_image(dev), iov, iov_cnt, offset, completion);
#define tcmu_rbd_aio_write(dev, aio_cb, completion, iov, iov_cnt, length, offset) \
rbd_aio_writev(tcmu_dev_to_image(dev), iov, iov_cnt, offset, completion);
#else
static int tcmu_rbd_aio_read(struct tcmu_device *dev, struct rbd_aio_cb *aio_cb,
rbd_completion_t completion, struct iovec *iov,
size_t iov_cnt, size_t length, off_t offset)
{
struct tcmu_rbd_state *state = tcmu_get_dev_private(dev);
int ret;
aio_cb->bounce_buffer = malloc(length);
if (!aio_cb->bounce_buffer) {
tcmu_dev_err(dev, "Could not allocate bounce buffer.\n");
return -ENOMEM;
}
ret = rbd_aio_read(state->image, offset, length, aio_cb->bounce_buffer,
completion);
if (ret < 0)
free(aio_cb->bounce_buffer);
return ret;
}
static int tcmu_rbd_aio_write(struct tcmu_device *dev, struct rbd_aio_cb *aio_cb,
rbd_completion_t completion, struct iovec *iov,
size_t iov_cnt, size_t length, off_t offset)
{
struct tcmu_rbd_state *state = tcmu_get_dev_private(dev);
int ret;
aio_cb->bounce_buffer = malloc(length);
if (!aio_cb->bounce_buffer) {
tcmu_dev_err(dev, "Failed to allocate bounce buffer.\n");
return -ENOMEM;;
}
tcmu_memcpy_from_iovec(aio_cb->bounce_buffer, length, iov, iov_cnt);
ret = rbd_aio_write(state->image, offset, length, aio_cb->bounce_buffer,
completion);
if (ret < 0)
free(aio_cb->bounce_buffer);
return ret;
}
#endif
/*
* NOTE: RBD async APIs almost always return 0 (success), except
* when allocation (via new) fails - which is not caught. So,
* the only errno we've to bother about as of now are memory
* allocation errors.
*/
static void rbd_finish_aio_generic(rbd_completion_t completion,
struct rbd_aio_cb *aio_cb)
{
struct tcmu_device *dev = aio_cb->dev;
struct tcmulib_cmd *tcmulib_cmd = aio_cb->tcmulib_cmd;
struct iovec *iov = aio_cb->iov;
size_t iov_cnt = aio_cb->iov_cnt;
uint32_t cmp_offset;
uint16_t asc_ascq;
int64_t ret;
int tcmu_r;
ret = rbd_aio_get_return_value(completion);
rbd_aio_release(completion);
if (ret == -ETIMEDOUT) {
tcmu_r = tcmu_rbd_handle_timedout_cmd(dev, tcmulib_cmd);
} else if (ret == -ESHUTDOWN) {
tcmu_r = tcmu_rbd_handle_blacklisted_cmd(dev, tcmulib_cmd);
} else if (ret == -EILSEQ && aio_cb->type == RBD_AIO_TYPE_CAW) {
cmp_offset = aio_cb->caw.miscompare_offset - aio_cb->caw.offset;
tcmu_dev_dbg(dev, "CAW miscompare at offset %u.\n", cmp_offset);
tcmu_r = tcmu_set_sense_data(tcmulib_cmd->sense_buf,
MISCOMPARE,
ASC_MISCOMPARE_DURING_VERIFY_OPERATION,
&cmp_offset);
} else if (ret == -EINVAL) {
tcmu_dev_err(dev, "Invalid IO request.\n");
tcmu_r = tcmu_set_sense_data(tcmulib_cmd->sense_buf,
ILLEGAL_REQUEST,
ASC_INVALID_FIELD_IN_CDB, NULL);
} else if (ret < 0) {
tcmu_dev_err(dev, "Got fatal IO error %d.\n", ret);
if (aio_cb->type == RBD_AIO_TYPE_READ)
asc_ascq = ASC_READ_ERROR;
else
asc_ascq = ASC_WRITE_ERROR;
tcmu_r = tcmu_set_sense_data(tcmulib_cmd->sense_buf,
MEDIUM_ERROR, asc_ascq, NULL);
} else {
tcmu_r = SAM_STAT_GOOD;
if (aio_cb->type == RBD_AIO_TYPE_READ &&
aio_cb->bounce_buffer) {
tcmu_memcpy_into_iovec(iov, iov_cnt,
aio_cb->bounce_buffer,
aio_cb->read.length);
}
}