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ublksrv_tgt.cpp
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// SPDX-License-Identifier: MIT or GPL-2.0-only
#include "config.h"
#include "ublksrv_tgt.h"
/* per-task variable */
static pthread_mutex_t jbuf_lock;
static int jbuf_size = 0;
static int queues_stored = 0;
static char *jbuf = NULL;
struct ublksrv_queue_info {
const struct ublksrv_dev *dev;
int qid;
pthread_t thread;
};
/********************cmd handling************************/
static char *full_cmd;
static struct ublksrv_tgt_type *tgt_list[UBLKSRV_TGT_TYPE_MAX] = {};
int ublk_json_write_dev_info(struct ublksrv_dev *dev, char **jbuf, int *len)
{
int ret = 0;
do {
ret = ublksrv_json_write_dev_info(ublksrv_get_ctrl_dev(dev),
*jbuf, *len);
if (ret < 0)
*jbuf = ublksrv_tgt_realloc_json_buf(dev, len);
} while (ret < 0);
return ret;
}
int ublk_json_write_params(struct ublksrv_dev *dev, char **jbuf, int *len,
const struct ublk_params *p)
{
int ret = 0;
do {
ret = ublksrv_json_write_params(p, *jbuf, *len);
if (ret < 0)
*jbuf = ublksrv_tgt_realloc_json_buf(dev, len);
} while (ret < 0);
return ret;
}
int ublk_json_write_target_base(struct ublksrv_dev *dev, char **jbuf, int *len,
const struct ublksrv_tgt_base_json *tgt)
{
int ret = 0;
do {
ret = ublksrv_json_write_target_base_info(*jbuf, *len, tgt);
if (ret < 0)
*jbuf = ublksrv_tgt_realloc_json_buf(dev, len);
} while (ret < 0);
return ret;
}
int ublk_json_write_tgt_str(struct ublksrv_dev *dev, char **jbuf,
int *len, const char *name, const char *val)
{
int ret = 0;
do {
if (val)
ret = ublksrv_json_write_target_str_info(*jbuf,
*len, name, val);
if (ret < 0)
*jbuf = ublksrv_tgt_realloc_json_buf(dev, len);
} while (ret < 0);
return ret;
}
int ublk_json_write_tgt_ulong(struct ublksrv_dev *dev, char **jbuf,
int *len, const char *name, unsigned long val)
{
int ret = 0;
do {
ret = ublksrv_json_write_target_ulong_info(*jbuf,
*len, name, val);
if (ret < 0)
*jbuf = ublksrv_tgt_realloc_json_buf(dev, len);
} while (ret < 0);
return ret;
}
int ublk_json_write_tgt_long(struct ublksrv_dev *dev, char **jbuf,
int *len, const char *name, long val)
{
int ret = 0;
do {
ret = ublksrv_json_write_target_long_info(*jbuf,
*len, name, val);
if (ret < 0)
*jbuf = ublksrv_tgt_realloc_json_buf(dev, len);
} while (ret < 0);
return ret;
}
static const struct ublksrv_tgt_type *ublksrv_find_tgt_type(const char *name)
{
int i;
for (i = 0; i < UBLKSRV_TGT_TYPE_MAX; i++) {
const struct ublksrv_tgt_type *type = tgt_list[i];
if (type == NULL)
continue;
if (!strcmp(type->name, name))
return type;
}
return NULL;
}
static void ublksrv_for_each_tgt_type(void (*handle_tgt_type)(unsigned idx,
const struct ublksrv_tgt_type *type, void *data),
void *data)
{
int i;
for (i = 0; i < UBLKSRV_TGT_TYPE_MAX; i++) {
const struct ublksrv_tgt_type *type = tgt_list[i];
if (!type)
continue;
handle_tgt_type(i, type, data);
}
}
int ublksrv_register_tgt_type(struct ublksrv_tgt_type *type)
{
if (type->type < UBLKSRV_TGT_TYPE_MAX && !tgt_list[type->type]) {
tgt_list[type->type] = type;
return 0;
}
return -1;
}
void ublksrv_unregister_tgt_type(struct ublksrv_tgt_type *type)
{
if (type->type < UBLKSRV_TGT_TYPE_MAX && tgt_list[type->type]) {
tgt_list[type->type] = NULL;
}
}
static char *mprintf(const char *fmt, ...)
{
va_list args;
char *str;
int ret;
va_start(args, fmt);
ret = vasprintf(&str, fmt, args);
va_end(args);
if (ret < 0) {
return NULL;
}
return str;
}
static char *pop_cmd(int *argc, char *argv[])
{
char *cmd = argv[1];
if (*argc < 2) {
return NULL;
}
memmove(&argv[1], &argv[2], *argc * sizeof(argv[0]));
(*argc)--;
full_cmd = mprintf("%s %s", full_cmd, cmd);
return cmd;
}
static int start_daemon(void (*child_fn)(void *), void *data)
{
char path[PATH_MAX];
int fd;
char *res;
if (setsid() == -1)
return -1;
res = getcwd(path, PATH_MAX);
if (!res)
ublk_err("%s: %d getcwd failed %m\n", __func__, __LINE__);
switch (fork()) {
case -1: return -1;
case 0: break;
default: _exit(EXIT_SUCCESS);
}
if (chdir(path) != 0)
ublk_err("%s: %d chdir failed %m\n", __func__, __LINE__);
close(STDIN_FILENO);
fd = open("/dev/null", O_RDWR);
if (fd != STDIN_FILENO)
return -1;
if (dup2(fd, STDOUT_FILENO) != STDOUT_FILENO)
return -1;
if (dup2(fd, STDERR_FILENO) != STDERR_FILENO)
return -1;
child_fn(data);
return 0;
}
char *__ublksrv_tgt_return_json_buf(struct ublksrv_dev *dev, int *size)
{
if (jbuf == NULL) {
jbuf_size = 1024;
jbuf = (char *)realloc((void *)jbuf, jbuf_size);
}
*size = jbuf_size;
return jbuf;
}
char *ublksrv_tgt_return_json_buf(struct ublksrv_dev *dev, int *size)
{
char *buf;
pthread_mutex_lock(&jbuf_lock);
buf = __ublksrv_tgt_return_json_buf(dev, size);
pthread_mutex_unlock(&jbuf_lock);
return buf;
}
static char *__ublksrv_tgt_realloc_json_buf(const struct ublksrv_dev *dev, int *size)
{
if (jbuf == NULL)
jbuf_size = 1024;
else
jbuf_size += 1024;
jbuf = (char *)realloc((void *)jbuf, jbuf_size);
*size = jbuf_size;
return jbuf;
}
char *ublksrv_tgt_realloc_json_buf(struct ublksrv_dev *dev, int *size)
{
char *buf;
pthread_mutex_lock(&jbuf_lock);
buf = __ublksrv_tgt_realloc_json_buf(dev, size);
pthread_mutex_unlock(&jbuf_lock);
return buf;
}
static int ublksrv_tgt_store_dev_data(const struct ublksrv_dev *dev,
const char *buf)
{
int ret;
int len = ublksrv_json_get_length(buf);
int fd = ublksrv_get_pidfile_fd(dev);
if (fd < 0) {
ublk_err( "fail to get fd of pid file, ret %d\n",
fd);
return fd;
}
ret = pwrite(fd, buf, len, JSON_OFFSET);
if (ret <= 0)
ublk_err( "fail to write json data to pid file, ret %d\n",
ret);
return ret;
}
static char *ublksrv_tgt_get_dev_data(struct ublksrv_ctrl_dev *cdev)
{
const struct ublksrv_ctrl_dev_info *info =
ublksrv_ctrl_get_dev_info(cdev);
int dev_id = info->dev_id;
struct stat st;
char pid_file[256];
char *buf;
int size, fd, ret;
const char *run_dir = ublksrv_ctrl_get_run_dir(cdev);
if (!run_dir)
return 0;
snprintf(pid_file, 256, "%s/%d.pid", run_dir, dev_id);
fd = open(pid_file, O_RDONLY);
if (fd <= 0)
return NULL;
if (fstat(fd, &st) < 0)
return NULL;
if (st.st_size <= JSON_OFFSET)
return NULL;
size = st.st_size - JSON_OFFSET;
buf = (char *)malloc(size);
ret = pread(fd, buf, size, JSON_OFFSET);
if (ret <= 0)
fprintf(stderr, "fail to read json from %s ret %d\n",
pid_file, ret);
close(fd);
return buf;
}
static void *ublksrv_io_handler_fn(void *data)
{
struct ublksrv_queue_info *info = (struct ublksrv_queue_info *)data;
const struct ublksrv_dev *dev = info->dev;
const struct ublksrv_ctrl_dev *cdev = ublksrv_get_ctrl_dev(dev);
const struct ublksrv_ctrl_dev_info *dinfo =
ublksrv_ctrl_get_dev_info(cdev);
unsigned dev_id = dinfo->dev_id;
unsigned short q_id = info->qid;
const struct ublksrv_queue *q;
int ret;
int buf_size;
char *buf;
const char *jbuf;
pthread_mutex_lock(&jbuf_lock);
if (!ublksrv_is_recovering(cdev)) {
do {
buf = __ublksrv_tgt_realloc_json_buf(dev, &buf_size);
ret = ublksrv_json_write_queue_info(cdev, buf, buf_size,
q_id, ublksrv_gettid());
} while (ret < 0);
jbuf = buf;
} else {
jbuf = ublksrv_ctrl_get_recovery_jbuf(cdev);
}
queues_stored++;
/*
* A bit ugly to store json buffer to pid file here, but no easy
* way to do it in control task side, so far, so good
*/
if (queues_stored == dinfo->nr_hw_queues)
ublksrv_tgt_store_dev_data(dev, jbuf);
pthread_mutex_unlock(&jbuf_lock);
q = ublksrv_queue_init(dev, q_id, NULL);
if (!q) {
ublk_err("ublk dev %d queue %d init queue failed",
dev_id, q_id);
return NULL;
}
ublk_log("tid %d: ublk dev %d queue %d started", ublksrv_gettid(),
dev_id, q->q_id);
do {
if (ublksrv_process_io(q) < 0)
break;
} while (1);
ublk_log("ublk dev %d queue %d exited", dev_id, q->q_id);
ublksrv_queue_deinit(q);
return NULL;
}
static void sig_handler(int sig)
{
if (sig == SIGTERM)
ublk_log("got TERM signal");
}
static void setup_pthread_sigmask()
{
sigset_t signal_mask;
if (signal(SIGTERM, sig_handler) == SIG_ERR)
return;
/* make sure SIGTERM won't be blocked */
sigemptyset(&signal_mask);
sigaddset(&signal_mask, SIGINT);
sigaddset(&signal_mask, SIGTERM);
pthread_sigmask(SIG_BLOCK, &signal_mask, NULL);
}
/*
* Now STOP DEV ctrl command has been sent to /dev/ublk-control,
* and wait until all pending fetch commands are canceled
*/
static void ublksrv_drain_fetch_commands(const struct ublksrv_dev *dev,
struct ublksrv_queue_info *info)
{
const struct ublksrv_ctrl_dev_info *dinfo =
ublksrv_ctrl_get_dev_info(ublksrv_get_ctrl_dev(dev));
unsigned nr_queues = dinfo->nr_hw_queues;
int i;
void *ret;
for (i = 0; i < nr_queues; i++)
pthread_join(info[i].thread, &ret);
}
static void ublksrv_io_handler(void *data)
{
const struct ublksrv_ctrl_dev *ctrl_dev = (struct ublksrv_ctrl_dev *)data;
const struct ublksrv_ctrl_dev_info *dinfo =
ublksrv_ctrl_get_dev_info(ctrl_dev);
int dev_id = dinfo->dev_id;
int i;
char buf[32];
const struct ublksrv_dev *dev;
struct ublksrv_queue_info *info_array;
snprintf(buf, 32, "%s-%d", "ublksrvd", dev_id);
openlog(buf, LOG_PID, LOG_USER);
ublk_log("start ublksrv io daemon %s\n", buf);
pthread_mutex_init(&jbuf_lock, NULL);
dev = ublksrv_dev_init(ctrl_dev);
if (!dev) {
ublk_err( "dev-%d start ubsrv failed", dev_id);
goto out;
}
setup_pthread_sigmask();
if (!(dinfo->flags & UBLK_F_UNPRIVILEGED_DEV))
ublksrv_apply_oom_protection();
info_array = (struct ublksrv_queue_info *)calloc(sizeof(
struct ublksrv_queue_info),
dinfo->nr_hw_queues);
for (i = 0; i < dinfo->nr_hw_queues; i++) {
info_array[i].dev = dev;
info_array[i].qid = i;
pthread_create(&info_array[i].thread, NULL,
ublksrv_io_handler_fn,
&info_array[i]);
}
/* wait until we are terminated */
ublksrv_drain_fetch_commands(dev, info_array);
free(info_array);
free(jbuf);
ublksrv_dev_deinit(dev);
out:
ublk_log("end ublksrv io daemon");
closelog();
}
/* Not called from ublksrv daemon */
static int ublksrv_start_io_daemon(const struct ublksrv_ctrl_dev *dev)
{
start_daemon(ublksrv_io_handler, (void *)dev);
return 0;
}
static int ublksrv_check_dev_data(const char *buf, int size)
{
struct ublk_params p;
if (size < JSON_OFFSET)
return -EINVAL;
return ublksrv_json_read_params(&p, &buf[JSON_OFFSET]);
}
static int ublksrv_get_io_daemon_pid(const struct ublksrv_ctrl_dev *ctrl_dev,
bool check_data)
{
const char *run_dir = ublksrv_ctrl_get_run_dir(ctrl_dev);
const struct ublksrv_ctrl_dev_info *info =
ublksrv_ctrl_get_dev_info(ctrl_dev);
int ret = -1, pid_fd;
char path[256];
char *buf = NULL;
int size = JSON_OFFSET;
int daemon_pid;
struct stat st;
if (!run_dir)
return -EINVAL;
snprintf(path, 256, "%s/%d.pid", run_dir, info->dev_id);
pid_fd = open(path, O_RDONLY);
if (pid_fd < 0)
goto out;
if (fstat(pid_fd, &st) < 0)
goto out;
if (check_data)
size = st.st_size;
else
size = JSON_OFFSET;
buf = (char *)malloc(size);
if (read(pid_fd, buf, size) <= 0)
goto out;
daemon_pid = strtol(buf, NULL, 10);
if (daemon_pid < 0)
goto out;
ret = kill(daemon_pid, 0);
if (ret)
goto out;
if (check_data) {
ret = ublksrv_check_dev_data(buf, size);
if (ret)
goto out;
}
ret = daemon_pid;
out:
if (pid_fd > 0)
close(pid_fd);
free(buf);
return ret;
}
/* Not called from ublksrv daemon */
static int ublksrv_stop_io_daemon(const struct ublksrv_ctrl_dev *ctrl_dev)
{
int daemon_pid, cnt = 0;
/* wait until daemon is exited, or timeout after 3 seconds */
do {
daemon_pid = ublksrv_get_io_daemon_pid(ctrl_dev, false);
if (daemon_pid > 0) {
usleep(100000);
cnt++;
}
} while (daemon_pid > 0 && cnt < 30);
if (daemon_pid > 0)
return -1;
return 0;
}
/* Wait until ublk device is setup by udev */
static void ublksrv_check_dev(const struct ublksrv_ctrl_dev_info *info)
{
unsigned int max_time = 1000000, wait = 0;
char buf[64];
snprintf(buf, 64, "%s%d", "/dev/ublkc", info->dev_id);
while (wait < max_time) {
int fd = open(buf, O_RDWR);
if (fd > 0) {
close(fd);
break;
}
usleep(100000);
wait += 100000;
}
}
static int ublksrv_start_daemon(struct ublksrv_ctrl_dev *ctrl_dev)
{
const struct ublksrv_ctrl_dev_info *dinfo =
ublksrv_ctrl_get_dev_info(ctrl_dev);
int cnt = 0, daemon_pid, ret;
ublksrv_check_dev(dinfo);
ret = ublksrv_ctrl_get_affinity(ctrl_dev);
if (ret < 0) {
fprintf(stderr, "dev %d get affinity failed %d\n",
dinfo->dev_id, ret);
return -1;
}
switch (fork()) {
case -1:
return -1;
case 0:
ublksrv_start_io_daemon(ctrl_dev);
break;
}
/* wait until daemon is started, or timeout after 3 seconds */
do {
daemon_pid = ublksrv_get_io_daemon_pid(ctrl_dev, true);
if (daemon_pid < 0) {
usleep(100000);
cnt++;
}
} while (daemon_pid < 0 && cnt < 30);
return daemon_pid;
}
//todo: resolve stack usage warning for mkpath/__mkpath
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wstack-usage="
static int __mkpath(char *dir, mode_t mode)
{
struct stat sb;
int ret;
mode_t mask;
if (!dir)
return -EINVAL;
if (!stat(dir, &sb))
return 0;
__mkpath(dirname(strdupa(dir)), mode);
mask = umask(0);
ret = mkdir(dir, mode);
umask(mask);
return ret;
}
static int mkpath(const char *dir)
{
return __mkpath(strdupa(dir), S_IRWXU | S_IRWXG | S_IRWXO);
}
#pragma GCC diagnostic pop
static void ublksrv_tgt_set_params(struct ublksrv_ctrl_dev *cdev,
const char *jbuf)
{
const struct ublksrv_ctrl_dev_info *info =
ublksrv_ctrl_get_dev_info(cdev);
int dev_id = info->dev_id;
struct ublk_params p;
int ret;
ret = ublksrv_json_read_params(&p, jbuf);
if (ret >= 0) {
ret = ublksrv_ctrl_set_params(cdev, &p);
if (ret)
fprintf(stderr, "set param for dev %d failed %d\n",
dev_id, ret);
} else {
fprintf(stderr, "params not found for dev %d failed %d\n",
dev_id, ret);
}
}
static int cmd_dev_add(int argc, char *argv[])
{
static const struct option longopts[] = {
{ "type", 1, NULL, 't' },
{ "number", 1, NULL, 'n' },
{ "queues", 1, NULL, 'q' },
{ "depth", 1, NULL, 'd' },
{ "zero_copy", 1, NULL, 'z' },
{ "uring_comp", 1, NULL, 'u' },
{ "need_get_data", 1, NULL, 'g' },
{ "user_recovery", 1, NULL, 'r'},
{ "user_recovery_fail_io", 1, NULL, 'e'},
{ "user_recovery_reissue", 1, NULL, 'i'},
{ "debug_mask", 1, NULL, 0},
{ "unprivileged", 0, NULL, 0},
{ "usercopy", 0, NULL, 0},
{ NULL }
};
struct ublksrv_dev_data data = {0};
struct ublksrv_ctrl_dev *dev;
const struct ublksrv_tgt_type *tgt_type;
int opt, ret;
int uring_comp = 0;
int need_get_data = 0;
int user_recovery = 0;
int user_recovery_fail_io = 0;
int user_recovery_reissue = 0;
int unprivileged = 0;
const char *dump_buf;
int option_index = 0;
unsigned int debug_mask = 0;
data.queue_depth = DEF_QD;
data.nr_hw_queues = DEF_NR_HW_QUEUES;
data.dev_id = -1;
data.run_dir = UBLKSRV_PID_DIR;
mkpath(data.run_dir);
while ((opt = getopt_long(argc, argv, "-:t:n:d:q:u:g:r:e:i:z",
longopts, &option_index)) != -1) {
switch (opt) {
case 'n':
data.dev_id = strtol(optarg, NULL, 10);
break;
case 't':
data.tgt_type = optarg;
break;
case 'z':
data.flags |= UBLK_F_SUPPORT_ZERO_COPY;
break;
case 'q':
data.nr_hw_queues = strtol(optarg, NULL, 10);
break;
case 'd':
data.queue_depth = strtol(optarg, NULL, 10);
break;
case 'u':
uring_comp = strtol(optarg, NULL, 10);
break;
case 'g':
need_get_data = strtol(optarg, NULL, 10);
break;
case 'r':
user_recovery = strtol(optarg, NULL, 10);
break;
case 'e':
user_recovery_fail_io = strtol(optarg, NULL, 10);
break;
case 'i':
user_recovery_reissue = strtol(optarg, NULL, 10);
break;
case 0:
if (!strcmp(longopts[option_index].name, "debug_mask"))
debug_mask = strtol(optarg, NULL, 16);
if (!strcmp(longopts[option_index].name, "unprivileged"))
unprivileged = 1;
if (!strcmp(longopts[option_index].name, "usercopy"))
data.flags |= UBLK_F_USER_COPY;
break;
}
}
ublk_set_debug_mask(debug_mask);
data.max_io_buf_bytes = DEF_BUF_SIZE;
if (data.nr_hw_queues > MAX_NR_HW_QUEUES)
data.nr_hw_queues = MAX_NR_HW_QUEUES;
if (data.queue_depth > MAX_QD)
data.queue_depth = MAX_QD;
if (uring_comp)
data.flags |= UBLK_F_URING_CMD_COMP_IN_TASK;
if (need_get_data)
data.flags |= UBLK_F_NEED_GET_DATA;
if (user_recovery)
data.flags |= UBLK_F_USER_RECOVERY;
if (user_recovery_fail_io)
data.flags |= UBLK_F_USER_RECOVERY | UBLK_F_USER_RECOVERY_FAIL_IO;
if (user_recovery_reissue)
data.flags |= UBLK_F_USER_RECOVERY | UBLK_F_USER_RECOVERY_REISSUE;
if (unprivileged)
data.flags |= UBLK_F_UNPRIVILEGED_DEV;
if (data.tgt_type == NULL) {
fprintf(stderr, "no dev type specified\n");
return -EINVAL;
}
tgt_type = ublksrv_find_tgt_type(data.tgt_type);
if (tgt_type == NULL) {
fprintf(stderr, "unknown dev type: %s\n", data.tgt_type);
return -EINVAL;
}
data.tgt_ops = tgt_type;
data.flags |= tgt_type->ublk_flags;
data.ublksrv_flags |= tgt_type->ublksrv_flags;
//optind = 0; /* so that tgt code can parse their arguments */
data.tgt_argc = argc;
data.tgt_argv = argv;
dev = ublksrv_ctrl_init(&data);
if (!dev) {
fprintf(stderr, "can't init dev %d\n", data.dev_id);
return -EOPNOTSUPP;
}
ret = ublksrv_ctrl_add_dev(dev);
if (ret < 0) {
fprintf(stderr, "can't add dev %d, ret %d\n", data.dev_id, ret);
goto fail;
}
{
const struct ublksrv_ctrl_dev_info *info =
ublksrv_ctrl_get_dev_info(dev);
data.dev_id = info->dev_id;
}
ret = ublksrv_start_daemon(dev);
if (ret <= 0) {
fprintf(stderr, "start dev %d daemon failed, ret %d\n",
data.dev_id, ret);
goto fail_del_dev;
}
dump_buf = ublksrv_tgt_get_dev_data(dev);
ublksrv_tgt_set_params(dev, dump_buf);
ret = ublksrv_ctrl_start_dev(dev, ret);
if (ret < 0) {
fprintf(stderr, "start dev %d failed, ret %d\n", data.dev_id,
ret);
goto fail_stop_daemon;
}
ret = ublksrv_ctrl_get_info(dev);
ublksrv_ctrl_dump(dev, dump_buf);
ublksrv_ctrl_deinit(dev);
return 0;
fail_stop_daemon:
ublksrv_stop_io_daemon(dev);
fail_del_dev:
ublksrv_ctrl_del_dev(dev);
fail:
ublksrv_ctrl_deinit(dev);
return ret;
}
struct tgt_types_name {
unsigned pos;
char names[4096 - sizeof(unsigned)];
};
static void collect_tgt_types(unsigned int idx,
const struct ublksrv_tgt_type *type, void *pdata)
{
struct tgt_types_name *data = (struct tgt_types_name *)pdata;
if (idx > 0)
data->pos += snprintf(data->names + data->pos,
sizeof(data->names) - data->pos, "|");
data->pos += snprintf(data->names + data->pos,
sizeof(data->names) - data->pos, "%s", type->name);
}
static void show_tgt_add_usage(unsigned int idx,
const struct ublksrv_tgt_type *type, void *data)
{
if (type->usage_for_add)
type->usage_for_add();
}
static void cmd_dev_add_usage(const char *cmd)
{
struct tgt_types_name data = {
.pos = 0,
};
data.pos += snprintf(data.names + data.pos, sizeof(data.names) - data.pos, "{");
ublksrv_for_each_tgt_type(collect_tgt_types, &data);
data.pos += snprintf(data.names + data.pos, sizeof(data.names) - data.pos, "}");
printf("%s add -t %s\n", cmd, data.names);
printf("\t-n DEV_ID -q NR_HW_QUEUES -d QUEUE_DEPTH\n");
printf("\t-u URING_COMP -g NEED_GET_DATA -r USER_RECOVERY\n");
printf("\t-i USER_RECOVERY_REISSUE -e USER_RECOVERY_FAIL_IO\n");
printf("\t--debug_mask=0x{DBG_MASK} --unprivileged\n\n");
printf("\ttarget specific command line:\n");
ublksrv_for_each_tgt_type(show_tgt_add_usage, NULL);
}
static int __cmd_dev_del(int number, bool log, bool async)
{
struct ublksrv_ctrl_dev *dev;
int ret;
struct ublksrv_dev_data data = {
.dev_id = number,
.run_dir = UBLKSRV_PID_DIR,
};
dev = ublksrv_ctrl_init(&data);
if (!dev) {
fprintf(stderr, "ublksrv_ctrl_init failed id %d\n", number);
return -EOPNOTSUPP;
}
ret = ublksrv_ctrl_get_info(dev);
if (ret < 0) {
ret = 0;
if (log)
fprintf(stderr, "can't get dev info from %d: %d\n", number, ret);
goto fail;
}
ret = ublksrv_ctrl_stop_dev(dev);
if (ret < 0) {
fprintf(stderr, "stop dev %d failed\n", number);
goto fail;
}
ret = ublksrv_stop_io_daemon(dev);
if (ret < 0)
fprintf(stderr, "stop daemon %d failed\n", number);
if (async)
ret = ublksrv_ctrl_del_dev_async(dev);
else
ret = ublksrv_ctrl_del_dev(dev);
if (ret < 0) {
fprintf(stderr, "delete dev %d failed %d\n", number, ret);
goto fail;
}
fail:
ublksrv_ctrl_deinit(dev);
return ret;
}
static int cmd_dev_del(int argc, char *argv[])
{
static const struct option longopts[] = {
{ "number", 1, NULL, 'n' },
{ "all", 0, NULL, 'a' },
{ "async", 0, NULL, 0 },
{ NULL }
};
int number = -1;
int opt, ret, i;
unsigned async = 0;
int option_index = 0;
while ((opt = getopt_long(argc, argv, "n:a",
longopts, &option_index)) != -1) {
switch (opt) {
case 'a':
break;
case 'n':
number = strtol(optarg, NULL, 10);
break;
case 0:
if (!strcmp(longopts[option_index].name, "async"))
async = 1;
}
}
if (number >= 0)
return __cmd_dev_del(number, true, async);
for (i = 0; i < MAX_NR_UBLK_DEVS; i++) {
ret = __cmd_dev_del(i, false, async);
if (ret == -EOPNOTSUPP)
return ret;
}
return ret;
}
static void cmd_dev_del_usage(const char *cmd)
{
printf("%s del -n DEV_ID [-a | --all]\n", cmd);
}
static int list_one_dev(int number, bool log, bool verbose)
{
struct ublksrv_dev_data data = {
.dev_id = number,
.run_dir = UBLKSRV_PID_DIR,
};
struct ublksrv_ctrl_dev *dev = ublksrv_ctrl_init(&data);
int ret;
if (!dev) {
fprintf(stderr, "ublksrv_ctrl_init failed id %d\n", number);
return -EOPNOTSUPP;
}
ret = ublksrv_ctrl_get_info(dev);
if (ret < 0) {
if (log)
fprintf(stderr, "can't get dev info from %d: %d\n", number, ret);
} else {
const char *buf = ublksrv_tgt_get_dev_data(dev);
if (verbose)
ublksrv_json_dump(buf);