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tcmu-synthesizer.c
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tcmu-synthesizer.c
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/*
* Copyright 2016, Red Hat, 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 <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <assert.h>
#include <glib.h>
#include <gio/gio.h>
#include <getopt.h>
#include <scsi/scsi.h>
#include "scsi_defs.h"
#include "libtcmu.h"
#include "version.h"
#include "libtcmu_config.h"
#include "libtcmu_log.h"
#define _GNU_SOURCE
#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 <fcntl.h>
#include <endian.h>
#include <errno.h>
#include <scsi/scsi.h>
#include "scsi_defs.h"
#include "libtcmu.h"
#include "tcmu-runner.h"
struct file_state {
int fd;
};
static int file_open(struct tcmu_device *dev)
{
struct file_state *state;
char *config;
state = calloc(1, sizeof(*state));
if (!state)
return -ENOMEM;
tcmu_set_dev_private(dev, state);
config = strchr(tcmu_get_dev_cfgstring(dev), '/');
if (!config) {
tcmu_err("no configuration found in cfgstring\n");
goto err;
}
config += 1; /* get past '/' */
tcmu_set_dev_write_cache_enabled(dev, 1);
state->fd = open(config, O_CREAT | O_RDWR, S_IRUSR | S_IWUSR);
if (state->fd == -1) {
tcmu_err("could not open %s: %m\n", config);
goto err;
}
tcmu_dbg("config %s\n", tcmu_get_dev_cfgstring(dev));
return 0;
err:
free(state);
return -EINVAL;
}
static void file_close(struct tcmu_device *dev)
{
struct file_state *state = tcmu_get_dev_private(dev);
close(state->fd);
free(state);
}
static int file_read(struct tcmu_device *dev, struct tcmulib_cmd *cmd,
struct iovec *iov, size_t iov_cnt, size_t length,
off_t offset)
{
struct file_state *state = tcmu_get_dev_private(dev);
size_t remaining = length;
ssize_t ret;
while (remaining) {
ret = preadv(state->fd, iov, iov_cnt, offset);
if (ret < 0) {
tcmu_err("read failed: %m\n");
ret = tcmu_set_sense_data(cmd->sense_buf, MEDIUM_ERROR,
ASC_READ_ERROR, NULL);
goto done;
}
if (ret == 0) {
/* EOF, then zeros the iovecs left */
tcmu_zero_iovec(iov, iov_cnt);
break;
}
tcmu_seek_in_iovec(iov, ret);
offset += ret;
remaining -= ret;
}
ret = SAM_STAT_GOOD;
done:
cmd->done(dev, cmd, ret);
return 0;
}
static int file_write(struct tcmu_device *dev, struct tcmulib_cmd *cmd,
struct iovec *iov, size_t iov_cnt, size_t length,
off_t offset)
{
struct file_state *state = tcmu_get_dev_private(dev);
size_t remaining = length;
ssize_t ret;
while (remaining) {
ret = pwritev(state->fd, iov, iov_cnt, offset);
if (ret < 0) {
tcmu_err("write failed: %m\n");
ret = tcmu_set_sense_data(cmd->sense_buf, MEDIUM_ERROR,
ASC_WRITE_ERROR, NULL);
goto done;
}
tcmu_seek_in_iovec(iov, ret);
offset += ret;
remaining -= ret;
}
ret = SAM_STAT_GOOD;
done:
cmd->done(dev, cmd, ret);
return 0;
}
static int file_flush(struct tcmu_device *dev, struct tcmulib_cmd *cmd)
{
struct file_state *state = tcmu_get_dev_private(dev);
int ret;
if (fsync(state->fd)) {
tcmu_err("sync failed\n");
ret = tcmu_set_sense_data(cmd->sense_buf, MEDIUM_ERROR,
ASC_WRITE_ERROR, NULL);
goto done;
}
ret = SAM_STAT_GOOD;
done:
cmd->done(dev, cmd, ret);
return 0;
}
static int file_reconfig(struct tcmu_device *dev, struct tcmulib_cfg_info *cfg)
{
switch (cfg->type) {
case TCMULIB_CFG_DEV_SIZE:
/*
* TODO - For open/reconfig we should make sure the FS the
* file is on is large enough for the requested size. For
* now assume we can grow the file and return 0.
*/
return 0;
case TCMULIB_CFG_DEV_CFGSTR:
case TCMULIB_CFG_WRITE_CACHE:
default:
return -EOPNOTSUPP;
}
}
static const char file_cfg_desc[] =
"The path to the file to use as a backstore.";
static struct tcmur_handler file_handler = {
.cfg_desc = file_cfg_desc,
.reconfig = file_reconfig,
.open = file_open,
.close = file_close,
.read = file_read,
.write = file_write,
.flush = file_flush,
.name = "File-backed Handler (example code)",
.subtype = "file",
.nr_threads = 2,
};
typedef struct {
GIOChannel *gio;
int watcher_id;
} syn_dev_t;
static int syn_handle_cmd(struct tcmu_device *dev, uint8_t *cdb,
struct iovec *iovec, size_t iov_cnt,
uint8_t *sense)
{
uint8_t cmd;
cmd = cdb[0];
tcmu_dbg("syn handle cmd %d\n", cmd);
switch (cmd) {
case INQUIRY:
return tcmu_emulate_inquiry(dev, NULL, cdb, iovec, iov_cnt,
sense);
break;
case TEST_UNIT_READY:
return tcmu_emulate_test_unit_ready(cdb, iovec, iov_cnt, sense);
break;
case SERVICE_ACTION_IN_16:
if (cdb[1] == READ_CAPACITY_16)
return tcmu_emulate_read_capacity_16(1 << 20,
512,
cdb, iovec,
iov_cnt, sense);
else
return TCMU_NOT_HANDLED;
break;
case MODE_SENSE:
case MODE_SENSE_10:
return tcmu_emulate_mode_sense(dev, cdb, iovec, iov_cnt, sense);
break;
case MODE_SELECT:
case MODE_SELECT_10:
return tcmu_emulate_mode_select(dev, cdb, iovec, iov_cnt, sense);
break;
case READ_6:
case READ_10:
case READ_12:
case READ_16:
return SAM_STAT_GOOD;
case WRITE_6:
case WRITE_10:
case WRITE_12:
case WRITE_16:
return SAM_STAT_GOOD;
default:
tcmu_dbg("unknown command %x\n", cdb[0]);
return TCMU_NOT_HANDLED;
}
}
static gboolean syn_dev_callback(GIOChannel *source,
GIOCondition condition,
gpointer data)
{
int ret;
struct tcmu_device *dev = data;
struct tcmulib_cmd *cmd;
tcmu_dbg("dev fd cb\n");
tcmulib_processing_start(dev);
while ((cmd = tcmulib_get_next_command(dev)) != NULL) {
ret = syn_handle_cmd(dev,
cmd->cdb,
cmd->iovec,
cmd->iov_cnt,
cmd->sense_buf);
tcmulib_command_complete(dev, cmd, ret);
}
tcmulib_processing_complete(dev);
return TRUE;
}
static int syn_added(struct tcmu_device *dev)
{
syn_dev_t *s = g_new0(syn_dev_t, 1);
tcmu_dbg("added %s\n", tcmu_get_dev_cfgstring(dev));
tcmu_set_dev_private(dev, s);
s->gio = g_io_channel_unix_new(tcmu_get_dev_fd(dev));
s->watcher_id = g_io_add_watch(s->gio, G_IO_IN,
syn_dev_callback, dev);
return 0;
}
static void syn_removed(struct tcmu_device *dev)
{
syn_dev_t *s = tcmu_get_dev_private(dev);
tcmu_dbg("removed %s\n", tcmu_get_dev_cfgstring(dev));
g_source_remove(s->watcher_id);
g_io_channel_unref(s->gio);
g_free(s);
}
struct tcmulib_handler syn_handler = {
.name = "syn",
.subtype = "syn",
.cfg_desc = "valid options:\n"
"null: a nop storage where R/W requests are completed "
"immediately, like the null_blk device.",
.added = syn_added,
.removed = syn_removed,
};
gboolean tcmulib_callback(GIOChannel *source,
GIOCondition condition,
gpointer data)
{
struct tcmulib_context *ctx = data;
tcmu_dbg("master fd ready\n");
tcmulib_master_fd_ready(ctx);
return TRUE;
}
static void usage(void) {
printf("\nusage:\n");
printf("\ttcmu-synthesizer [options]\n");
printf("\noptions:\n");
printf("\t-h, --help: print this message and exit\n");
printf("\t-V, --version: print version and exit\n");
printf("\t-d, --debug: enable debug messages\n");
printf("\n");
}
static struct option long_options[] = {
{"debug", no_argument, 0, 'd'},
{"help", no_argument, 0, 'h'},
{"version", no_argument, 0, 'V'},
{0, 0, 0, 0},
};
int main(int argc, char **argv)
{
GMainLoop *loop;
GIOChannel *libtcmu_gio;
struct tcmulib_context *ctx;
while (1) {
int c;
int option_index = 0;
c = getopt_long(argc, argv, "dhV",
long_options, &option_index);
if (c == -1)
break;
switch (c) {
case 'd':
tcmu_set_log_level(TCMU_CONF_LOG_DEBUG);
break;
case 'V':
printf("tcmu-synthesizer %s\n", TCMUR_VERSION);
exit(1);
default:
case 'h':
usage();
exit(1);
}
}
if (tcmu_setup_log()) {
fprintf(stderr, "Could not setup tcmu logger.\n");
exit(1);
}
ctx = tcmulib_initialize(&syn_handler, 1);
if (!ctx) {
tcmu_err("tcmulib_initialize failed\n");
tcmu_destroy_log();
exit(1);
}
tcmulib_register(ctx);
/* Set up event for libtcmu */
libtcmu_gio = g_io_channel_unix_new(tcmulib_get_master_fd(ctx));
g_io_add_watch(libtcmu_gio, G_IO_IN, tcmulib_callback, ctx);
loop = g_main_loop_new(NULL, FALSE);
g_main_loop_run(loop);
g_main_loop_unref(loop);
tcmu_destroy_log();
return 0;
}