New example file :
iscsi-dd can be used to copy the content of one iscsi lun onto a different iscsi lun of the exact same sixe. This example illustrates how to "steal" a task structure from a callback so we can use store it and have it remains valid after the read10 callback has completed. It also illustrates the async api of libiscsi for read10/write10. Initially a number of read10 calls are made asynchronously until the queue is full. As each read10 completes and returns data, we issue a write10 to write that data to the other lun. As soon as a write10 completes, we "release" the initial read10 task corresponding to what we wrote and issue a new read10 to continue copying the next set of un-read data. Using the async api, it should be easy to get very high performance and throughput even from one single thread.
This commit is contained in:
Ronnie Sahlberg
298
examples/iscsi-dd.c
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298
examples/iscsi-dd.c
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/*
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Copyright (C) 2010 by Ronnie Sahlberg <ronniesahlberg@gmail.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <string.h>
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#include <poll.h>
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#include <popt.h>
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#include "iscsi.h"
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#include "scsi-lowlevel.h"
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char *initiator = "iqn.2010-11.ronnie:iscsi-inq";
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int max_in_flight = 50;
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int blocks_per_io = 200;
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struct client {
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int finished;
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int in_flight;
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struct iscsi_context *src_iscsi;
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int src_lun;
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int src_blocksize;
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uint64_t src_num_blocks;
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uint64_t pos;
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struct iscsi_context *dst_iscsi;
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int dst_lun;
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int dst_blocksize;
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uint64_t dst_num_blocks;
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};
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void fill_read_queue(struct client *client);
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struct write_task {
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struct scsi_task *rt;
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struct client *client;
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};
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void write10_cb(struct iscsi_context *iscsi, int status, void *command_data, void *private_data)
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{
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struct write_task *wt = (struct write_task *)private_data;
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struct scsi_task *task = command_data;
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struct client *client = wt->client;
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if (status == SCSI_STATUS_CHECK_CONDITION) {
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printf("Write10 failed with sense key:%d ascq:%04x\n", task->sense.key, task->sense.ascq);
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exit(10);
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}
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if (status != SCSI_STATUS_GOOD) {
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printf("Write10 failed with %s\n", iscsi_get_error(iscsi));
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exit(10);
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}
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client->in_flight--;
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fill_read_queue(client);
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if ((client->in_flight == 0) && (client->pos == client->src_num_blocks)) {
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client->finished = 1;
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}
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scsi_free_scsi_task(wt->rt);
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free(wt);
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}
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void read10_cb(struct iscsi_context *iscsi, int status, void *command_data, void *private_data)
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{
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struct client *client = (struct client *)private_data;
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struct scsi_task *task = command_data;
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struct write_task *wt;
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if (status == SCSI_STATUS_CHECK_CONDITION) {
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printf("Read10 failed with sense key:%d ascq:%04x\n", task->sense.key, task->sense.ascq);
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exit(10);
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}
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wt = malloc(sizeof(struct write_task));
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iscsi_cbdata_steal_scsi_task(task);
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wt->rt = task;
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wt->client = client;
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if (iscsi_write10_async(client->dst_iscsi,
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client->dst_lun,
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task->datain.data,
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task->datain.size,
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task->params.read10.lba,
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0, 0,
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client->dst_blocksize, write10_cb,
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wt) != 0) {
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printf("failed to send read10 command\n");
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exit(10);
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}
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}
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void fill_read_queue(struct client *client)
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{
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int num_blocks;
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while(client->in_flight < max_in_flight && client->pos < client->src_num_blocks) {
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client->in_flight++;
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num_blocks = client->src_num_blocks - client->pos;
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if (num_blocks > blocks_per_io) {
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num_blocks = blocks_per_io;
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}
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if (iscsi_read10_async(client->src_iscsi,
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client->src_lun, client->pos,
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num_blocks * client->src_blocksize,
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client->src_blocksize, read10_cb, client) != 0) {
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printf("failed to send read10 command\n");
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exit(10);
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}
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client->pos += num_blocks;
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}
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}
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int main(int argc, const char *argv[])
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{
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poptContext pc;
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const char **extra_argv;
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char *src_url = NULL;
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char *dst_url = NULL;
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struct iscsi_url *iscsi_url;
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struct scsi_task *task;
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struct scsi_readcapacity10 *rc10;
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int extra_argc = 0;
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int res;
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struct pollfd pfd[2];
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struct client client;
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struct poptOption popt_options[] = {
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POPT_AUTOHELP
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{ "initiator-name", 'i', POPT_ARG_STRING, &initiator, 0, "Initiatorname to use", "iqn-name" },
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{ "src", 0, POPT_ARG_STRING, &src_url, 0, "SRC lun", "iscsi url" },
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{ "dst", 0, POPT_ARG_STRING, &dst_url, 0, "DST lun", "iscsi url" },
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POPT_TABLEEND
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};
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pc = poptGetContext(argv[0], argc, argv, popt_options, POPT_CONTEXT_POSIXMEHARDER);
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if ((res = poptGetNextOpt(pc)) < -1) {
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fprintf(stderr, "Failed to parse option : %s %s\n",
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poptBadOption(pc, 0), poptStrerror(res));
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exit(10);
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}
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extra_argv = poptGetArgs(pc);
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poptFreeContext(pc);
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if (src_url == NULL) {
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fprintf(stderr, "You must specify source url\n");
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fprintf(stderr, " --src iscsi://<host>[:<port>]/<target-iqn>/<lun>\n", argv[0]);
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exit(10);
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}
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if (dst_url == NULL) {
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fprintf(stderr, "You must specify destination url\n");
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fprintf(stderr, " --dst iscsi://<host>[:<port>]/<target-iqn>/<lun>\n", argv[0]);
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exit(10);
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}
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memset(&client, 0, sizeof(client));
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client.src_iscsi = iscsi_create_context(initiator);
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if (client.src_iscsi == NULL) {
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fprintf(stderr, "Failed to create context\n");
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exit(10);
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}
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iscsi_url = iscsi_parse_full_url(client.src_iscsi, src_url);
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if (iscsi_url == NULL) {
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fprintf(stderr, "Failed to parse URL: %s\n",
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iscsi_get_error(client.src_iscsi));
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exit(10);
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}
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iscsi_set_targetname(client.src_iscsi, iscsi_url->target);
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iscsi_set_session_type(client.src_iscsi, ISCSI_SESSION_NORMAL);
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iscsi_set_header_digest(client.src_iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C);
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if (iscsi_url->user != NULL) {
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if (iscsi_set_initiator_username_pwd(client.src_iscsi, iscsi_url->user, iscsi_url->passwd) != 0) {
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fprintf(stderr, "Failed to set initiator username and password\n");
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exit(10);
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}
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}
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if (iscsi_full_connect_sync(client.src_iscsi, iscsi_url->portal, iscsi_url->lun) != 0) {
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fprintf(stderr, "Login Failed. %s\n", iscsi_get_error(client.src_iscsi));
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iscsi_destroy_url(iscsi_url);
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iscsi_destroy_context(client.src_iscsi);
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exit(10);
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}
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client.src_lun = iscsi_url->lun;
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iscsi_destroy_url(iscsi_url);
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task = iscsi_readcapacity10_sync(client.src_iscsi, client.src_lun, 0, 0);
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if (task == NULL || task->status != SCSI_STATUS_GOOD) {
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fprintf(stderr, "failed to send readcapacity command\n");
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exit(10);
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}
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rc10 = scsi_datain_unmarshall(task);
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if (rc10 == NULL) {
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fprintf(stderr, "failed to unmarshall readcapacity10 data\n");
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exit(10);
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}
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client.src_blocksize = rc10->block_size;
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client.src_num_blocks = rc10->lba;
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scsi_free_scsi_task(task);
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client.dst_iscsi = iscsi_create_context(initiator);
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if (client.dst_iscsi == NULL) {
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fprintf(stderr, "Failed to create context\n");
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exit(10);
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}
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iscsi_url = iscsi_parse_full_url(client.dst_iscsi, dst_url);
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if (iscsi_url == NULL) {
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fprintf(stderr, "Failed to parse URL: %s\n",
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iscsi_get_error(client.dst_iscsi));
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exit(10);
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}
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iscsi_set_targetname(client.dst_iscsi, iscsi_url->target);
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iscsi_set_session_type(client.dst_iscsi, ISCSI_SESSION_NORMAL);
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iscsi_set_header_digest(client.dst_iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C);
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if (iscsi_url->user != NULL) {
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if (iscsi_set_initiator_username_pwd(client.dst_iscsi, iscsi_url->user, iscsi_url->passwd) != 0) {
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fprintf(stderr, "Failed to set initiator username and password\n");
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exit(10);
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}
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}
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if (iscsi_full_connect_sync(client.dst_iscsi, iscsi_url->portal, iscsi_url->lun) != 0) {
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fprintf(stderr, "Login Failed. %s\n", iscsi_get_error(client.dst_iscsi));
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iscsi_destroy_url(iscsi_url);
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iscsi_destroy_context(client.dst_iscsi);
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exit(10);
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}
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client.dst_lun = iscsi_url->lun;
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iscsi_destroy_url(iscsi_url);
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task = iscsi_readcapacity10_sync(client.dst_iscsi, client.dst_lun, 0, 0);
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if (task == NULL || task->status != SCSI_STATUS_GOOD) {
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fprintf(stderr, "failed to send readcapacity command\n");
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exit(10);
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}
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rc10 = scsi_datain_unmarshall(task);
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if (rc10 == NULL) {
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fprintf(stderr, "failed to unmarshall readcapacity10 data\n");
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exit(10);
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}
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client.dst_blocksize = rc10->block_size;
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client.dst_num_blocks = rc10->lba;
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scsi_free_scsi_task(task);
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fill_read_queue(&client);
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while (client.finished == 0) {
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pfd[0].fd = iscsi_get_fd(client.src_iscsi);
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pfd[0].events = iscsi_which_events(client.src_iscsi);
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pfd[1].fd = iscsi_get_fd(client.dst_iscsi);
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pfd[1].events = iscsi_which_events(client.dst_iscsi);
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if (poll(&pfd[0], 2, -1) < 0) {
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printf("Poll failed");
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exit(10);
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}
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if (iscsi_service(client.src_iscsi, pfd[0].revents) < 0) {
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printf("iscsi_service failed with : %s\n", iscsi_get_error(client.src_iscsi));
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break;
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}
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if (iscsi_service(client.dst_iscsi, pfd[1].revents) < 0) {
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printf("iscsi_service failed with : %s\n", iscsi_get_error(client.dst_iscsi));
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break;
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}
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}
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iscsi_logout_sync(client.src_iscsi);
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iscsi_destroy_context(client.src_iscsi);
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iscsi_logout_sync(client.dst_iscsi);
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iscsi_destroy_context(client.dst_iscsi);
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return 0;
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}
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