root / block / iscsi.c @ 13c91cb7
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/*
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* QEMU Block driver for iSCSI images
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*
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* Copyright (c) 2010-2011 Ronnie Sahlberg <ronniesahlberg@gmail.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "config-host.h" |
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#include <poll.h> |
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#include <arpa/inet.h> |
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#include "qemu-common.h" |
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#include "qemu/config-file.h" |
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#include "qemu/error-report.h" |
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#include "block/block_int.h" |
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#include "trace.h" |
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#include "block/scsi.h" |
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#include "qemu/iov.h" |
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#include <iscsi/iscsi.h> |
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#include <iscsi/scsi-lowlevel.h> |
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#ifdef __linux__
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#include <scsi/sg.h> |
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#include <block/scsi.h> |
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#endif
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typedef struct IscsiLun { |
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struct iscsi_context *iscsi;
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int lun;
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enum scsi_inquiry_peripheral_device_type type;
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int block_size;
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uint64_t num_blocks; |
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int events;
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QEMUTimer *nop_timer; |
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} IscsiLun; |
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|
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typedef struct IscsiAIOCB { |
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BlockDriverAIOCB common; |
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QEMUIOVector *qiov; |
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QEMUBH *bh; |
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IscsiLun *iscsilun; |
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struct scsi_task *task;
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uint8_t *buf; |
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int status;
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int canceled;
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int retries;
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int64_t sector_num; |
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int nb_sectors;
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#ifdef __linux__
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sg_io_hdr_t *ioh; |
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#endif
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} IscsiAIOCB; |
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|
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#define NOP_INTERVAL 5000 |
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#define MAX_NOP_FAILURES 3 |
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#define ISCSI_CMD_RETRIES 5 |
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|
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static void |
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iscsi_bh_cb(void *p)
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{
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IscsiAIOCB *acb = p; |
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qemu_bh_delete(acb->bh); |
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g_free(acb->buf); |
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acb->buf = NULL;
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|
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if (acb->canceled == 0) { |
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acb->common.cb(acb->common.opaque, acb->status); |
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} |
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|
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if (acb->task != NULL) { |
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scsi_free_scsi_task(acb->task); |
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acb->task = NULL;
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} |
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|
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qemu_aio_release(acb); |
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} |
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|
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static void |
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iscsi_schedule_bh(IscsiAIOCB *acb) |
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{
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if (acb->bh) {
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return;
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} |
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acb->bh = qemu_bh_new(iscsi_bh_cb, acb); |
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qemu_bh_schedule(acb->bh); |
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} |
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static void |
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iscsi_abort_task_cb(struct iscsi_context *iscsi, int status, void *command_data, |
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void *private_data)
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{
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IscsiAIOCB *acb = private_data; |
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acb->status = -ECANCELED; |
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iscsi_schedule_bh(acb); |
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} |
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|
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static void |
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iscsi_aio_cancel(BlockDriverAIOCB *blockacb) |
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{
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IscsiAIOCB *acb = (IscsiAIOCB *)blockacb; |
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IscsiLun *iscsilun = acb->iscsilun; |
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if (acb->status != -EINPROGRESS) {
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return;
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} |
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acb->canceled = 1;
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/* send a task mgmt call to the target to cancel the task on the target */
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iscsi_task_mgmt_abort_task_async(iscsilun->iscsi, acb->task, |
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iscsi_abort_task_cb, acb); |
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while (acb->status == -EINPROGRESS) {
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qemu_aio_wait(); |
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} |
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} |
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static const AIOCBInfo iscsi_aiocb_info = { |
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.aiocb_size = sizeof(IscsiAIOCB),
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.cancel = iscsi_aio_cancel, |
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}; |
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static void iscsi_process_read(void *arg); |
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static void iscsi_process_write(void *arg); |
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static void |
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iscsi_set_events(IscsiLun *iscsilun) |
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{
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struct iscsi_context *iscsi = iscsilun->iscsi;
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int ev;
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/* We always register a read handler. */
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ev = POLLIN; |
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ev |= iscsi_which_events(iscsi); |
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if (ev != iscsilun->events) {
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qemu_aio_set_fd_handler(iscsi_get_fd(iscsi), |
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iscsi_process_read, |
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(ev & POLLOUT) ? iscsi_process_write : NULL,
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iscsilun); |
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} |
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iscsilun->events = ev; |
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} |
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static void |
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iscsi_process_read(void *arg)
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{
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IscsiLun *iscsilun = arg; |
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struct iscsi_context *iscsi = iscsilun->iscsi;
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iscsi_service(iscsi, POLLIN); |
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iscsi_set_events(iscsilun); |
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} |
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static void |
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iscsi_process_write(void *arg)
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{
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IscsiLun *iscsilun = arg; |
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struct iscsi_context *iscsi = iscsilun->iscsi;
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iscsi_service(iscsi, POLLOUT); |
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iscsi_set_events(iscsilun); |
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} |
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static int |
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iscsi_aio_writev_acb(IscsiAIOCB *acb); |
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static void |
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iscsi_aio_write16_cb(struct iscsi_context *iscsi, int status, |
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void *command_data, void *opaque) |
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{
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IscsiAIOCB *acb = opaque; |
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trace_iscsi_aio_write16_cb(iscsi, status, acb, acb->canceled); |
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g_free(acb->buf); |
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acb->buf = NULL;
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if (acb->canceled != 0) { |
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return;
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} |
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acb->status = 0;
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if (status != 0) { |
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if (status == SCSI_STATUS_CHECK_CONDITION
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&& acb->task->sense.key == SCSI_SENSE_UNIT_ATTENTION |
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&& acb->retries-- > 0) {
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scsi_free_scsi_task(acb->task); |
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acb->task = NULL;
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if (iscsi_aio_writev_acb(acb) == 0) { |
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iscsi_set_events(acb->iscsilun); |
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return;
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} |
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} |
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error_report("Failed to write16 data to iSCSI lun. %s",
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iscsi_get_error(iscsi)); |
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acb->status = -EIO; |
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} |
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iscsi_schedule_bh(acb); |
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} |
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static int64_t sector_lun2qemu(int64_t sector, IscsiLun *iscsilun)
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{
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return sector * iscsilun->block_size / BDRV_SECTOR_SIZE;
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} |
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static int64_t sector_qemu2lun(int64_t sector, IscsiLun *iscsilun)
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{
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return sector * BDRV_SECTOR_SIZE / iscsilun->block_size;
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} |
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static bool is_request_lun_aligned(int64_t sector_num, int nb_sectors, |
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IscsiLun *iscsilun) |
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{
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if ((sector_num * BDRV_SECTOR_SIZE) % iscsilun->block_size ||
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(nb_sectors * BDRV_SECTOR_SIZE) % iscsilun->block_size) {
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error_report("iSCSI misaligned request: "
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"iscsilun->block_size %u, sector_num %" PRIi64
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", nb_sectors %d",
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iscsilun->block_size, sector_num, nb_sectors); |
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return 0; |
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} |
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return 1; |
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} |
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|
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static int |
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iscsi_aio_writev_acb(IscsiAIOCB *acb) |
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{
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struct iscsi_context *iscsi = acb->iscsilun->iscsi;
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size_t size; |
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uint32_t num_sectors; |
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uint64_t lba; |
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#if !defined(LIBISCSI_FEATURE_IOVECTOR)
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struct iscsi_data data;
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#endif
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int ret;
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acb->canceled = 0;
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acb->bh = NULL;
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acb->status = -EINPROGRESS; |
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acb->buf = NULL;
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|
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/* this will allow us to get rid of 'buf' completely */
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size = acb->nb_sectors * BDRV_SECTOR_SIZE; |
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|
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#if !defined(LIBISCSI_FEATURE_IOVECTOR)
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data.size = MIN(size, acb->qiov->size); |
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|
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/* if the iovec only contains one buffer we can pass it directly */
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if (acb->qiov->niov == 1) { |
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data.data = acb->qiov->iov[0].iov_base;
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} else {
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acb->buf = g_malloc(data.size); |
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qemu_iovec_to_buf(acb->qiov, 0, acb->buf, data.size);
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data.data = acb->buf; |
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} |
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#endif
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acb->task = malloc(sizeof(struct scsi_task)); |
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if (acb->task == NULL) { |
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error_report("iSCSI: Failed to allocate task for scsi WRITE16 "
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"command. %s", iscsi_get_error(iscsi));
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return -1; |
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} |
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memset(acb->task, 0, sizeof(struct scsi_task)); |
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|
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acb->task->xfer_dir = SCSI_XFER_WRITE; |
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acb->task->cdb_size = 16;
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acb->task->cdb[0] = 0x8a; |
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lba = sector_qemu2lun(acb->sector_num, acb->iscsilun); |
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*(uint32_t *)&acb->task->cdb[2] = htonl(lba >> 32); |
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*(uint32_t *)&acb->task->cdb[6] = htonl(lba & 0xffffffff); |
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num_sectors = sector_qemu2lun(acb->nb_sectors, acb->iscsilun); |
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*(uint32_t *)&acb->task->cdb[10] = htonl(num_sectors);
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acb->task->expxferlen = size; |
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|
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#if defined(LIBISCSI_FEATURE_IOVECTOR)
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ret = iscsi_scsi_command_async(iscsi, acb->iscsilun->lun, acb->task, |
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iscsi_aio_write16_cb, |
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NULL,
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acb); |
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#else
|
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ret = iscsi_scsi_command_async(iscsi, acb->iscsilun->lun, acb->task, |
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iscsi_aio_write16_cb, |
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&data, |
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acb); |
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#endif
|
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if (ret != 0) { |
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scsi_free_scsi_task(acb->task); |
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g_free(acb->buf); |
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return -1; |
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} |
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|
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#if defined(LIBISCSI_FEATURE_IOVECTOR)
|
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scsi_task_set_iov_out(acb->task, (struct scsi_iovec*) acb->qiov->iov, acb->qiov->niov);
|
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#endif
|
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|
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return 0; |
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} |
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|
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static BlockDriverAIOCB *
|
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iscsi_aio_writev(BlockDriverState *bs, int64_t sector_num, |
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QEMUIOVector *qiov, int nb_sectors,
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BlockDriverCompletionFunc *cb, |
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void *opaque)
|
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{
|
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IscsiLun *iscsilun = bs->opaque; |
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IscsiAIOCB *acb; |
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|
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if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) {
|
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return NULL; |
| 337 |
} |
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|
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acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque); |
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trace_iscsi_aio_writev(iscsilun->iscsi, sector_num, nb_sectors, opaque, acb); |
| 341 |
|
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acb->iscsilun = iscsilun; |
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acb->qiov = qiov; |
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acb->nb_sectors = nb_sectors; |
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acb->sector_num = sector_num; |
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acb->retries = ISCSI_CMD_RETRIES; |
| 347 |
|
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if (iscsi_aio_writev_acb(acb) != 0) { |
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qemu_aio_release(acb); |
| 350 |
return NULL; |
| 351 |
} |
| 352 |
|
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iscsi_set_events(iscsilun); |
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return &acb->common;
|
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} |
| 356 |
|
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static int |
| 358 |
iscsi_aio_readv_acb(IscsiAIOCB *acb); |
| 359 |
|
| 360 |
static void |
| 361 |
iscsi_aio_read16_cb(struct iscsi_context *iscsi, int status, |
| 362 |
void *command_data, void *opaque) |
| 363 |
{
|
| 364 |
IscsiAIOCB *acb = opaque; |
| 365 |
|
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trace_iscsi_aio_read16_cb(iscsi, status, acb, acb->canceled); |
| 367 |
|
| 368 |
if (acb->canceled != 0) { |
| 369 |
return;
|
| 370 |
} |
| 371 |
|
| 372 |
acb->status = 0;
|
| 373 |
if (status != 0) { |
| 374 |
if (status == SCSI_STATUS_CHECK_CONDITION
|
| 375 |
&& acb->task->sense.key == SCSI_SENSE_UNIT_ATTENTION |
| 376 |
&& acb->retries-- > 0) {
|
| 377 |
scsi_free_scsi_task(acb->task); |
| 378 |
acb->task = NULL;
|
| 379 |
if (iscsi_aio_readv_acb(acb) == 0) { |
| 380 |
iscsi_set_events(acb->iscsilun); |
| 381 |
return;
|
| 382 |
} |
| 383 |
} |
| 384 |
error_report("Failed to read16 data from iSCSI lun. %s",
|
| 385 |
iscsi_get_error(iscsi)); |
| 386 |
acb->status = -EIO; |
| 387 |
} |
| 388 |
|
| 389 |
iscsi_schedule_bh(acb); |
| 390 |
} |
| 391 |
|
| 392 |
static int |
| 393 |
iscsi_aio_readv_acb(IscsiAIOCB *acb) |
| 394 |
{
|
| 395 |
struct iscsi_context *iscsi = acb->iscsilun->iscsi;
|
| 396 |
size_t size; |
| 397 |
uint64_t lba; |
| 398 |
uint32_t num_sectors; |
| 399 |
int ret;
|
| 400 |
#if !defined(LIBISCSI_FEATURE_IOVECTOR)
|
| 401 |
int i;
|
| 402 |
#endif
|
| 403 |
|
| 404 |
acb->canceled = 0;
|
| 405 |
acb->bh = NULL;
|
| 406 |
acb->status = -EINPROGRESS; |
| 407 |
acb->buf = NULL;
|
| 408 |
|
| 409 |
size = acb->nb_sectors * BDRV_SECTOR_SIZE; |
| 410 |
|
| 411 |
acb->task = malloc(sizeof(struct scsi_task)); |
| 412 |
if (acb->task == NULL) { |
| 413 |
error_report("iSCSI: Failed to allocate task for scsi READ16 "
|
| 414 |
"command. %s", iscsi_get_error(iscsi));
|
| 415 |
return -1; |
| 416 |
} |
| 417 |
memset(acb->task, 0, sizeof(struct scsi_task)); |
| 418 |
|
| 419 |
acb->task->xfer_dir = SCSI_XFER_READ; |
| 420 |
acb->task->expxferlen = size; |
| 421 |
lba = sector_qemu2lun(acb->sector_num, acb->iscsilun); |
| 422 |
num_sectors = sector_qemu2lun(acb->nb_sectors, acb->iscsilun); |
| 423 |
|
| 424 |
switch (acb->iscsilun->type) {
|
| 425 |
case TYPE_DISK:
|
| 426 |
acb->task->cdb_size = 16;
|
| 427 |
acb->task->cdb[0] = 0x88; |
| 428 |
*(uint32_t *)&acb->task->cdb[2] = htonl(lba >> 32); |
| 429 |
*(uint32_t *)&acb->task->cdb[6] = htonl(lba & 0xffffffff); |
| 430 |
*(uint32_t *)&acb->task->cdb[10] = htonl(num_sectors);
|
| 431 |
break;
|
| 432 |
default:
|
| 433 |
acb->task->cdb_size = 10;
|
| 434 |
acb->task->cdb[0] = 0x28; |
| 435 |
*(uint32_t *)&acb->task->cdb[2] = htonl(lba);
|
| 436 |
*(uint16_t *)&acb->task->cdb[7] = htons(num_sectors);
|
| 437 |
break;
|
| 438 |
} |
| 439 |
|
| 440 |
ret = iscsi_scsi_command_async(iscsi, acb->iscsilun->lun, acb->task, |
| 441 |
iscsi_aio_read16_cb, |
| 442 |
NULL,
|
| 443 |
acb); |
| 444 |
if (ret != 0) { |
| 445 |
scsi_free_scsi_task(acb->task); |
| 446 |
return -1; |
| 447 |
} |
| 448 |
|
| 449 |
#if defined(LIBISCSI_FEATURE_IOVECTOR)
|
| 450 |
scsi_task_set_iov_in(acb->task, (struct scsi_iovec*) acb->qiov->iov, acb->qiov->niov);
|
| 451 |
#else
|
| 452 |
for (i = 0; i < acb->qiov->niov; i++) { |
| 453 |
scsi_task_add_data_in_buffer(acb->task, |
| 454 |
acb->qiov->iov[i].iov_len, |
| 455 |
acb->qiov->iov[i].iov_base); |
| 456 |
} |
| 457 |
#endif
|
| 458 |
return 0; |
| 459 |
} |
| 460 |
|
| 461 |
static BlockDriverAIOCB *
|
| 462 |
iscsi_aio_readv(BlockDriverState *bs, int64_t sector_num, |
| 463 |
QEMUIOVector *qiov, int nb_sectors,
|
| 464 |
BlockDriverCompletionFunc *cb, |
| 465 |
void *opaque)
|
| 466 |
{
|
| 467 |
IscsiLun *iscsilun = bs->opaque; |
| 468 |
IscsiAIOCB *acb; |
| 469 |
|
| 470 |
if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) {
|
| 471 |
return NULL; |
| 472 |
} |
| 473 |
|
| 474 |
acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque); |
| 475 |
trace_iscsi_aio_readv(iscsilun->iscsi, sector_num, nb_sectors, opaque, acb); |
| 476 |
|
| 477 |
acb->nb_sectors = nb_sectors; |
| 478 |
acb->sector_num = sector_num; |
| 479 |
acb->iscsilun = iscsilun; |
| 480 |
acb->qiov = qiov; |
| 481 |
acb->retries = ISCSI_CMD_RETRIES; |
| 482 |
|
| 483 |
if (iscsi_aio_readv_acb(acb) != 0) { |
| 484 |
qemu_aio_release(acb); |
| 485 |
return NULL; |
| 486 |
} |
| 487 |
|
| 488 |
iscsi_set_events(iscsilun); |
| 489 |
return &acb->common;
|
| 490 |
} |
| 491 |
|
| 492 |
static int |
| 493 |
iscsi_aio_flush_acb(IscsiAIOCB *acb); |
| 494 |
|
| 495 |
static void |
| 496 |
iscsi_synccache10_cb(struct iscsi_context *iscsi, int status, |
| 497 |
void *command_data, void *opaque) |
| 498 |
{
|
| 499 |
IscsiAIOCB *acb = opaque; |
| 500 |
|
| 501 |
if (acb->canceled != 0) { |
| 502 |
return;
|
| 503 |
} |
| 504 |
|
| 505 |
acb->status = 0;
|
| 506 |
if (status != 0) { |
| 507 |
if (status == SCSI_STATUS_CHECK_CONDITION
|
| 508 |
&& acb->task->sense.key == SCSI_SENSE_UNIT_ATTENTION |
| 509 |
&& acb->retries-- > 0) {
|
| 510 |
scsi_free_scsi_task(acb->task); |
| 511 |
acb->task = NULL;
|
| 512 |
if (iscsi_aio_flush_acb(acb) == 0) { |
| 513 |
iscsi_set_events(acb->iscsilun); |
| 514 |
return;
|
| 515 |
} |
| 516 |
} |
| 517 |
error_report("Failed to sync10 data on iSCSI lun. %s",
|
| 518 |
iscsi_get_error(iscsi)); |
| 519 |
acb->status = -EIO; |
| 520 |
} |
| 521 |
|
| 522 |
iscsi_schedule_bh(acb); |
| 523 |
} |
| 524 |
|
| 525 |
static int |
| 526 |
iscsi_aio_flush_acb(IscsiAIOCB *acb) |
| 527 |
{
|
| 528 |
struct iscsi_context *iscsi = acb->iscsilun->iscsi;
|
| 529 |
|
| 530 |
acb->canceled = 0;
|
| 531 |
acb->bh = NULL;
|
| 532 |
acb->status = -EINPROGRESS; |
| 533 |
acb->buf = NULL;
|
| 534 |
|
| 535 |
acb->task = iscsi_synchronizecache10_task(iscsi, acb->iscsilun->lun, |
| 536 |
0, 0, 0, 0, |
| 537 |
iscsi_synccache10_cb, |
| 538 |
acb); |
| 539 |
if (acb->task == NULL) { |
| 540 |
error_report("iSCSI: Failed to send synchronizecache10 command. %s",
|
| 541 |
iscsi_get_error(iscsi)); |
| 542 |
return -1; |
| 543 |
} |
| 544 |
|
| 545 |
return 0; |
| 546 |
} |
| 547 |
|
| 548 |
static BlockDriverAIOCB *
|
| 549 |
iscsi_aio_flush(BlockDriverState *bs, |
| 550 |
BlockDriverCompletionFunc *cb, void *opaque)
|
| 551 |
{
|
| 552 |
IscsiLun *iscsilun = bs->opaque; |
| 553 |
|
| 554 |
IscsiAIOCB *acb; |
| 555 |
|
| 556 |
acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque); |
| 557 |
|
| 558 |
acb->iscsilun = iscsilun; |
| 559 |
acb->retries = ISCSI_CMD_RETRIES; |
| 560 |
|
| 561 |
if (iscsi_aio_flush_acb(acb) != 0) { |
| 562 |
qemu_aio_release(acb); |
| 563 |
return NULL; |
| 564 |
} |
| 565 |
|
| 566 |
iscsi_set_events(iscsilun); |
| 567 |
|
| 568 |
return &acb->common;
|
| 569 |
} |
| 570 |
|
| 571 |
static int iscsi_aio_discard_acb(IscsiAIOCB *acb); |
| 572 |
|
| 573 |
static void |
| 574 |
iscsi_unmap_cb(struct iscsi_context *iscsi, int status, |
| 575 |
void *command_data, void *opaque) |
| 576 |
{
|
| 577 |
IscsiAIOCB *acb = opaque; |
| 578 |
|
| 579 |
if (acb->canceled != 0) { |
| 580 |
return;
|
| 581 |
} |
| 582 |
|
| 583 |
acb->status = 0;
|
| 584 |
if (status != 0) { |
| 585 |
if (status == SCSI_STATUS_CHECK_CONDITION
|
| 586 |
&& acb->task->sense.key == SCSI_SENSE_UNIT_ATTENTION |
| 587 |
&& acb->retries-- > 0) {
|
| 588 |
scsi_free_scsi_task(acb->task); |
| 589 |
acb->task = NULL;
|
| 590 |
if (iscsi_aio_discard_acb(acb) == 0) { |
| 591 |
iscsi_set_events(acb->iscsilun); |
| 592 |
return;
|
| 593 |
} |
| 594 |
} |
| 595 |
error_report("Failed to unmap data on iSCSI lun. %s",
|
| 596 |
iscsi_get_error(iscsi)); |
| 597 |
acb->status = -EIO; |
| 598 |
} |
| 599 |
|
| 600 |
iscsi_schedule_bh(acb); |
| 601 |
} |
| 602 |
|
| 603 |
static int iscsi_aio_discard_acb(IscsiAIOCB *acb) { |
| 604 |
struct iscsi_context *iscsi = acb->iscsilun->iscsi;
|
| 605 |
struct unmap_list list[1]; |
| 606 |
|
| 607 |
acb->canceled = 0;
|
| 608 |
acb->bh = NULL;
|
| 609 |
acb->status = -EINPROGRESS; |
| 610 |
acb->buf = NULL;
|
| 611 |
|
| 612 |
list[0].lba = sector_qemu2lun(acb->sector_num, acb->iscsilun);
|
| 613 |
list[0].num = acb->nb_sectors * BDRV_SECTOR_SIZE / acb->iscsilun->block_size;
|
| 614 |
|
| 615 |
acb->task = iscsi_unmap_task(iscsi, acb->iscsilun->lun, |
| 616 |
0, 0, &list[0], 1, |
| 617 |
iscsi_unmap_cb, |
| 618 |
acb); |
| 619 |
if (acb->task == NULL) { |
| 620 |
error_report("iSCSI: Failed to send unmap command. %s",
|
| 621 |
iscsi_get_error(iscsi)); |
| 622 |
return -1; |
| 623 |
} |
| 624 |
|
| 625 |
return 0; |
| 626 |
} |
| 627 |
|
| 628 |
static BlockDriverAIOCB *
|
| 629 |
iscsi_aio_discard(BlockDriverState *bs, |
| 630 |
int64_t sector_num, int nb_sectors,
|
| 631 |
BlockDriverCompletionFunc *cb, void *opaque)
|
| 632 |
{
|
| 633 |
IscsiLun *iscsilun = bs->opaque; |
| 634 |
IscsiAIOCB *acb; |
| 635 |
|
| 636 |
acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque); |
| 637 |
|
| 638 |
acb->iscsilun = iscsilun; |
| 639 |
acb->nb_sectors = nb_sectors; |
| 640 |
acb->sector_num = sector_num; |
| 641 |
acb->retries = ISCSI_CMD_RETRIES; |
| 642 |
|
| 643 |
if (iscsi_aio_discard_acb(acb) != 0) { |
| 644 |
qemu_aio_release(acb); |
| 645 |
return NULL; |
| 646 |
} |
| 647 |
|
| 648 |
iscsi_set_events(iscsilun); |
| 649 |
|
| 650 |
return &acb->common;
|
| 651 |
} |
| 652 |
|
| 653 |
#ifdef __linux__
|
| 654 |
static void |
| 655 |
iscsi_aio_ioctl_cb(struct iscsi_context *iscsi, int status, |
| 656 |
void *command_data, void *opaque) |
| 657 |
{
|
| 658 |
IscsiAIOCB *acb = opaque; |
| 659 |
|
| 660 |
g_free(acb->buf); |
| 661 |
acb->buf = NULL;
|
| 662 |
|
| 663 |
if (acb->canceled != 0) { |
| 664 |
return;
|
| 665 |
} |
| 666 |
|
| 667 |
acb->status = 0;
|
| 668 |
if (status < 0) { |
| 669 |
error_report("Failed to ioctl(SG_IO) to iSCSI lun. %s",
|
| 670 |
iscsi_get_error(iscsi)); |
| 671 |
acb->status = -EIO; |
| 672 |
} |
| 673 |
|
| 674 |
acb->ioh->driver_status = 0;
|
| 675 |
acb->ioh->host_status = 0;
|
| 676 |
acb->ioh->resid = 0;
|
| 677 |
|
| 678 |
#define SG_ERR_DRIVER_SENSE 0x08 |
| 679 |
|
| 680 |
if (status == SCSI_STATUS_CHECK_CONDITION && acb->task->datain.size >= 2) { |
| 681 |
int ss;
|
| 682 |
|
| 683 |
acb->ioh->driver_status |= SG_ERR_DRIVER_SENSE; |
| 684 |
|
| 685 |
acb->ioh->sb_len_wr = acb->task->datain.size - 2;
|
| 686 |
ss = (acb->ioh->mx_sb_len >= acb->ioh->sb_len_wr) ? |
| 687 |
acb->ioh->mx_sb_len : acb->ioh->sb_len_wr; |
| 688 |
memcpy(acb->ioh->sbp, &acb->task->datain.data[2], ss);
|
| 689 |
} |
| 690 |
|
| 691 |
iscsi_schedule_bh(acb); |
| 692 |
} |
| 693 |
|
| 694 |
static BlockDriverAIOCB *iscsi_aio_ioctl(BlockDriverState *bs,
|
| 695 |
unsigned long int req, void *buf, |
| 696 |
BlockDriverCompletionFunc *cb, void *opaque)
|
| 697 |
{
|
| 698 |
IscsiLun *iscsilun = bs->opaque; |
| 699 |
struct iscsi_context *iscsi = iscsilun->iscsi;
|
| 700 |
struct iscsi_data data;
|
| 701 |
IscsiAIOCB *acb; |
| 702 |
|
| 703 |
assert(req == SG_IO); |
| 704 |
|
| 705 |
acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque); |
| 706 |
|
| 707 |
acb->iscsilun = iscsilun; |
| 708 |
acb->canceled = 0;
|
| 709 |
acb->bh = NULL;
|
| 710 |
acb->status = -EINPROGRESS; |
| 711 |
acb->buf = NULL;
|
| 712 |
acb->ioh = buf; |
| 713 |
|
| 714 |
acb->task = malloc(sizeof(struct scsi_task)); |
| 715 |
if (acb->task == NULL) { |
| 716 |
error_report("iSCSI: Failed to allocate task for scsi command. %s",
|
| 717 |
iscsi_get_error(iscsi)); |
| 718 |
qemu_aio_release(acb); |
| 719 |
return NULL; |
| 720 |
} |
| 721 |
memset(acb->task, 0, sizeof(struct scsi_task)); |
| 722 |
|
| 723 |
switch (acb->ioh->dxfer_direction) {
|
| 724 |
case SG_DXFER_TO_DEV:
|
| 725 |
acb->task->xfer_dir = SCSI_XFER_WRITE; |
| 726 |
break;
|
| 727 |
case SG_DXFER_FROM_DEV:
|
| 728 |
acb->task->xfer_dir = SCSI_XFER_READ; |
| 729 |
break;
|
| 730 |
default:
|
| 731 |
acb->task->xfer_dir = SCSI_XFER_NONE; |
| 732 |
break;
|
| 733 |
} |
| 734 |
|
| 735 |
acb->task->cdb_size = acb->ioh->cmd_len; |
| 736 |
memcpy(&acb->task->cdb[0], acb->ioh->cmdp, acb->ioh->cmd_len);
|
| 737 |
acb->task->expxferlen = acb->ioh->dxfer_len; |
| 738 |
|
| 739 |
data.size = 0;
|
| 740 |
if (acb->task->xfer_dir == SCSI_XFER_WRITE) {
|
| 741 |
if (acb->ioh->iovec_count == 0) { |
| 742 |
data.data = acb->ioh->dxferp; |
| 743 |
data.size = acb->ioh->dxfer_len; |
| 744 |
} else {
|
| 745 |
#if defined(LIBISCSI_FEATURE_IOVECTOR)
|
| 746 |
scsi_task_set_iov_out(acb->task, |
| 747 |
(struct scsi_iovec *) acb->ioh->dxferp,
|
| 748 |
acb->ioh->iovec_count); |
| 749 |
#else
|
| 750 |
struct iovec *iov = (struct iovec *)acb->ioh->dxferp; |
| 751 |
|
| 752 |
acb->buf = g_malloc(acb->ioh->dxfer_len); |
| 753 |
data.data = acb->buf; |
| 754 |
data.size = iov_to_buf(iov, acb->ioh->iovec_count, 0,
|
| 755 |
acb->buf, acb->ioh->dxfer_len); |
| 756 |
#endif
|
| 757 |
} |
| 758 |
} |
| 759 |
|
| 760 |
if (iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task,
|
| 761 |
iscsi_aio_ioctl_cb, |
| 762 |
(data.size > 0) ? &data : NULL, |
| 763 |
acb) != 0) {
|
| 764 |
scsi_free_scsi_task(acb->task); |
| 765 |
qemu_aio_release(acb); |
| 766 |
return NULL; |
| 767 |
} |
| 768 |
|
| 769 |
/* tell libiscsi to read straight into the buffer we got from ioctl */
|
| 770 |
if (acb->task->xfer_dir == SCSI_XFER_READ) {
|
| 771 |
if (acb->ioh->iovec_count == 0) { |
| 772 |
scsi_task_add_data_in_buffer(acb->task, |
| 773 |
acb->ioh->dxfer_len, |
| 774 |
acb->ioh->dxferp); |
| 775 |
} else {
|
| 776 |
#if defined(LIBISCSI_FEATURE_IOVECTOR)
|
| 777 |
scsi_task_set_iov_in(acb->task, |
| 778 |
(struct scsi_iovec *) acb->ioh->dxferp,
|
| 779 |
acb->ioh->iovec_count); |
| 780 |
#else
|
| 781 |
int i;
|
| 782 |
for (i = 0; i < acb->ioh->iovec_count; i++) { |
| 783 |
struct iovec *iov = (struct iovec *)acb->ioh->dxferp; |
| 784 |
|
| 785 |
scsi_task_add_data_in_buffer(acb->task, |
| 786 |
iov[i].iov_len, |
| 787 |
iov[i].iov_base); |
| 788 |
} |
| 789 |
#endif
|
| 790 |
} |
| 791 |
} |
| 792 |
|
| 793 |
iscsi_set_events(iscsilun); |
| 794 |
|
| 795 |
return &acb->common;
|
| 796 |
} |
| 797 |
|
| 798 |
|
| 799 |
static void ioctl_cb(void *opaque, int status) |
| 800 |
{
|
| 801 |
int *p_status = opaque;
|
| 802 |
*p_status = status; |
| 803 |
} |
| 804 |
|
| 805 |
static int iscsi_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) |
| 806 |
{
|
| 807 |
IscsiLun *iscsilun = bs->opaque; |
| 808 |
int status;
|
| 809 |
|
| 810 |
switch (req) {
|
| 811 |
case SG_GET_VERSION_NUM:
|
| 812 |
*(int *)buf = 30000; |
| 813 |
break;
|
| 814 |
case SG_GET_SCSI_ID:
|
| 815 |
((struct sg_scsi_id *)buf)->scsi_type = iscsilun->type;
|
| 816 |
break;
|
| 817 |
case SG_IO:
|
| 818 |
status = -EINPROGRESS; |
| 819 |
iscsi_aio_ioctl(bs, req, buf, ioctl_cb, &status); |
| 820 |
|
| 821 |
while (status == -EINPROGRESS) {
|
| 822 |
qemu_aio_wait(); |
| 823 |
} |
| 824 |
|
| 825 |
return 0; |
| 826 |
default:
|
| 827 |
return -1; |
| 828 |
} |
| 829 |
return 0; |
| 830 |
} |
| 831 |
#endif
|
| 832 |
|
| 833 |
static int64_t
|
| 834 |
iscsi_getlength(BlockDriverState *bs) |
| 835 |
{
|
| 836 |
IscsiLun *iscsilun = bs->opaque; |
| 837 |
int64_t len; |
| 838 |
|
| 839 |
len = iscsilun->num_blocks; |
| 840 |
len *= iscsilun->block_size; |
| 841 |
|
| 842 |
return len;
|
| 843 |
} |
| 844 |
|
| 845 |
static int parse_chap(struct iscsi_context *iscsi, const char *target) |
| 846 |
{
|
| 847 |
QemuOptsList *list; |
| 848 |
QemuOpts *opts; |
| 849 |
const char *user = NULL; |
| 850 |
const char *password = NULL; |
| 851 |
|
| 852 |
list = qemu_find_opts("iscsi");
|
| 853 |
if (!list) {
|
| 854 |
return 0; |
| 855 |
} |
| 856 |
|
| 857 |
opts = qemu_opts_find(list, target); |
| 858 |
if (opts == NULL) { |
| 859 |
opts = QTAILQ_FIRST(&list->head); |
| 860 |
if (!opts) {
|
| 861 |
return 0; |
| 862 |
} |
| 863 |
} |
| 864 |
|
| 865 |
user = qemu_opt_get(opts, "user");
|
| 866 |
if (!user) {
|
| 867 |
return 0; |
| 868 |
} |
| 869 |
|
| 870 |
password = qemu_opt_get(opts, "password");
|
| 871 |
if (!password) {
|
| 872 |
error_report("CHAP username specified but no password was given");
|
| 873 |
return -1; |
| 874 |
} |
| 875 |
|
| 876 |
if (iscsi_set_initiator_username_pwd(iscsi, user, password)) {
|
| 877 |
error_report("Failed to set initiator username and password");
|
| 878 |
return -1; |
| 879 |
} |
| 880 |
|
| 881 |
return 0; |
| 882 |
} |
| 883 |
|
| 884 |
static void parse_header_digest(struct iscsi_context *iscsi, const char *target) |
| 885 |
{
|
| 886 |
QemuOptsList *list; |
| 887 |
QemuOpts *opts; |
| 888 |
const char *digest = NULL; |
| 889 |
|
| 890 |
list = qemu_find_opts("iscsi");
|
| 891 |
if (!list) {
|
| 892 |
return;
|
| 893 |
} |
| 894 |
|
| 895 |
opts = qemu_opts_find(list, target); |
| 896 |
if (opts == NULL) { |
| 897 |
opts = QTAILQ_FIRST(&list->head); |
| 898 |
if (!opts) {
|
| 899 |
return;
|
| 900 |
} |
| 901 |
} |
| 902 |
|
| 903 |
digest = qemu_opt_get(opts, "header-digest");
|
| 904 |
if (!digest) {
|
| 905 |
return;
|
| 906 |
} |
| 907 |
|
| 908 |
if (!strcmp(digest, "CRC32C")) { |
| 909 |
iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C); |
| 910 |
} else if (!strcmp(digest, "NONE")) { |
| 911 |
iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE); |
| 912 |
} else if (!strcmp(digest, "CRC32C-NONE")) { |
| 913 |
iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C_NONE); |
| 914 |
} else if (!strcmp(digest, "NONE-CRC32C")) { |
| 915 |
iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); |
| 916 |
} else {
|
| 917 |
error_report("Invalid header-digest setting : %s", digest);
|
| 918 |
} |
| 919 |
} |
| 920 |
|
| 921 |
static char *parse_initiator_name(const char *target) |
| 922 |
{
|
| 923 |
QemuOptsList *list; |
| 924 |
QemuOpts *opts; |
| 925 |
const char *name = NULL; |
| 926 |
const char *iscsi_name = qemu_get_vm_name(); |
| 927 |
|
| 928 |
list = qemu_find_opts("iscsi");
|
| 929 |
if (list) {
|
| 930 |
opts = qemu_opts_find(list, target); |
| 931 |
if (!opts) {
|
| 932 |
opts = QTAILQ_FIRST(&list->head); |
| 933 |
} |
| 934 |
if (opts) {
|
| 935 |
name = qemu_opt_get(opts, "initiator-name");
|
| 936 |
} |
| 937 |
} |
| 938 |
|
| 939 |
if (name) {
|
| 940 |
return g_strdup(name);
|
| 941 |
} else {
|
| 942 |
return g_strdup_printf("iqn.2008-11.org.linux-kvm%s%s", |
| 943 |
iscsi_name ? ":" : "", |
| 944 |
iscsi_name ? iscsi_name : "");
|
| 945 |
} |
| 946 |
} |
| 947 |
|
| 948 |
#if defined(LIBISCSI_FEATURE_NOP_COUNTER)
|
| 949 |
static void iscsi_nop_timed_event(void *opaque) |
| 950 |
{
|
| 951 |
IscsiLun *iscsilun = opaque; |
| 952 |
|
| 953 |
if (iscsi_get_nops_in_flight(iscsilun->iscsi) > MAX_NOP_FAILURES) {
|
| 954 |
error_report("iSCSI: NOP timeout. Reconnecting...");
|
| 955 |
iscsi_reconnect(iscsilun->iscsi); |
| 956 |
} |
| 957 |
|
| 958 |
if (iscsi_nop_out_async(iscsilun->iscsi, NULL, NULL, 0, NULL) != 0) { |
| 959 |
error_report("iSCSI: failed to sent NOP-Out. Disabling NOP messages.");
|
| 960 |
return;
|
| 961 |
} |
| 962 |
|
| 963 |
timer_mod(iscsilun->nop_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); |
| 964 |
iscsi_set_events(iscsilun); |
| 965 |
} |
| 966 |
#endif
|
| 967 |
|
| 968 |
static int iscsi_readcapacity_sync(IscsiLun *iscsilun) |
| 969 |
{
|
| 970 |
struct scsi_task *task = NULL; |
| 971 |
struct scsi_readcapacity10 *rc10 = NULL; |
| 972 |
struct scsi_readcapacity16 *rc16 = NULL; |
| 973 |
int ret = 0; |
| 974 |
int retries = ISCSI_CMD_RETRIES;
|
| 975 |
|
| 976 |
do {
|
| 977 |
if (task != NULL) { |
| 978 |
scsi_free_scsi_task(task); |
| 979 |
task = NULL;
|
| 980 |
} |
| 981 |
|
| 982 |
switch (iscsilun->type) {
|
| 983 |
case TYPE_DISK:
|
| 984 |
task = iscsi_readcapacity16_sync(iscsilun->iscsi, iscsilun->lun); |
| 985 |
if (task != NULL && task->status == SCSI_STATUS_GOOD) { |
| 986 |
rc16 = scsi_datain_unmarshall(task); |
| 987 |
if (rc16 == NULL) { |
| 988 |
error_report("iSCSI: Failed to unmarshall readcapacity16 data.");
|
| 989 |
ret = -EINVAL; |
| 990 |
} else {
|
| 991 |
iscsilun->block_size = rc16->block_length; |
| 992 |
iscsilun->num_blocks = rc16->returned_lba + 1;
|
| 993 |
} |
| 994 |
} |
| 995 |
break;
|
| 996 |
case TYPE_ROM:
|
| 997 |
task = iscsi_readcapacity10_sync(iscsilun->iscsi, iscsilun->lun, 0, 0); |
| 998 |
if (task != NULL && task->status == SCSI_STATUS_GOOD) { |
| 999 |
rc10 = scsi_datain_unmarshall(task); |
| 1000 |
if (rc10 == NULL) { |
| 1001 |
error_report("iSCSI: Failed to unmarshall readcapacity10 data.");
|
| 1002 |
ret = -EINVAL; |
| 1003 |
} else {
|
| 1004 |
iscsilun->block_size = rc10->block_size; |
| 1005 |
if (rc10->lba == 0) { |
| 1006 |
/* blank disk loaded */
|
| 1007 |
iscsilun->num_blocks = 0;
|
| 1008 |
} else {
|
| 1009 |
iscsilun->num_blocks = rc10->lba + 1;
|
| 1010 |
} |
| 1011 |
} |
| 1012 |
} |
| 1013 |
break;
|
| 1014 |
default:
|
| 1015 |
return 0; |
| 1016 |
} |
| 1017 |
} while (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION |
| 1018 |
&& task->sense.key == SCSI_SENSE_UNIT_ATTENTION |
| 1019 |
&& retries-- > 0);
|
| 1020 |
|
| 1021 |
if (task == NULL || task->status != SCSI_STATUS_GOOD) { |
| 1022 |
error_report("iSCSI: failed to send readcapacity10 command.");
|
| 1023 |
ret = -EINVAL; |
| 1024 |
} |
| 1025 |
if (task) {
|
| 1026 |
scsi_free_scsi_task(task); |
| 1027 |
} |
| 1028 |
return ret;
|
| 1029 |
} |
| 1030 |
|
| 1031 |
/* TODO Convert to fine grained options */
|
| 1032 |
static QemuOptsList runtime_opts = {
|
| 1033 |
.name = "iscsi",
|
| 1034 |
.head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head), |
| 1035 |
.desc = {
|
| 1036 |
{
|
| 1037 |
.name = "filename",
|
| 1038 |
.type = QEMU_OPT_STRING, |
| 1039 |
.help = "URL to the iscsi image",
|
| 1040 |
}, |
| 1041 |
{ /* end of list */ }
|
| 1042 |
}, |
| 1043 |
}; |
| 1044 |
|
| 1045 |
/*
|
| 1046 |
* We support iscsi url's on the form
|
| 1047 |
* iscsi://[<username>%<password>@]<host>[:<port>]/<targetname>/<lun>
|
| 1048 |
*/
|
| 1049 |
static int iscsi_open(BlockDriverState *bs, QDict *options, int flags) |
| 1050 |
{
|
| 1051 |
IscsiLun *iscsilun = bs->opaque; |
| 1052 |
struct iscsi_context *iscsi = NULL; |
| 1053 |
struct iscsi_url *iscsi_url = NULL; |
| 1054 |
struct scsi_task *task = NULL; |
| 1055 |
struct scsi_inquiry_standard *inq = NULL; |
| 1056 |
char *initiator_name = NULL; |
| 1057 |
QemuOpts *opts; |
| 1058 |
Error *local_err = NULL;
|
| 1059 |
const char *filename; |
| 1060 |
int ret;
|
| 1061 |
|
| 1062 |
if ((BDRV_SECTOR_SIZE % 512) != 0) { |
| 1063 |
error_report("iSCSI: Invalid BDRV_SECTOR_SIZE. "
|
| 1064 |
"BDRV_SECTOR_SIZE(%lld) is not a multiple "
|
| 1065 |
"of 512", BDRV_SECTOR_SIZE);
|
| 1066 |
return -EINVAL;
|
| 1067 |
} |
| 1068 |
|
| 1069 |
opts = qemu_opts_create_nofail(&runtime_opts); |
| 1070 |
qemu_opts_absorb_qdict(opts, options, &local_err); |
| 1071 |
if (error_is_set(&local_err)) {
|
| 1072 |
qerror_report_err(local_err); |
| 1073 |
error_free(local_err); |
| 1074 |
ret = -EINVAL; |
| 1075 |
goto out;
|
| 1076 |
} |
| 1077 |
|
| 1078 |
filename = qemu_opt_get(opts, "filename");
|
| 1079 |
|
| 1080 |
|
| 1081 |
iscsi_url = iscsi_parse_full_url(iscsi, filename); |
| 1082 |
if (iscsi_url == NULL) { |
| 1083 |
error_report("Failed to parse URL : %s", filename);
|
| 1084 |
ret = -EINVAL; |
| 1085 |
goto out;
|
| 1086 |
} |
| 1087 |
|
| 1088 |
memset(iscsilun, 0, sizeof(IscsiLun)); |
| 1089 |
|
| 1090 |
initiator_name = parse_initiator_name(iscsi_url->target); |
| 1091 |
|
| 1092 |
iscsi = iscsi_create_context(initiator_name); |
| 1093 |
if (iscsi == NULL) { |
| 1094 |
error_report("iSCSI: Failed to create iSCSI context.");
|
| 1095 |
ret = -ENOMEM; |
| 1096 |
goto out;
|
| 1097 |
} |
| 1098 |
|
| 1099 |
if (iscsi_set_targetname(iscsi, iscsi_url->target)) {
|
| 1100 |
error_report("iSCSI: Failed to set target name.");
|
| 1101 |
ret = -EINVAL; |
| 1102 |
goto out;
|
| 1103 |
} |
| 1104 |
|
| 1105 |
if (iscsi_url->user != NULL) { |
| 1106 |
ret = iscsi_set_initiator_username_pwd(iscsi, iscsi_url->user, |
| 1107 |
iscsi_url->passwd); |
| 1108 |
if (ret != 0) { |
| 1109 |
error_report("Failed to set initiator username and password");
|
| 1110 |
ret = -EINVAL; |
| 1111 |
goto out;
|
| 1112 |
} |
| 1113 |
} |
| 1114 |
|
| 1115 |
/* check if we got CHAP username/password via the options */
|
| 1116 |
if (parse_chap(iscsi, iscsi_url->target) != 0) { |
| 1117 |
error_report("iSCSI: Failed to set CHAP user/password");
|
| 1118 |
ret = -EINVAL; |
| 1119 |
goto out;
|
| 1120 |
} |
| 1121 |
|
| 1122 |
if (iscsi_set_session_type(iscsi, ISCSI_SESSION_NORMAL) != 0) { |
| 1123 |
error_report("iSCSI: Failed to set session type to normal.");
|
| 1124 |
ret = -EINVAL; |
| 1125 |
goto out;
|
| 1126 |
} |
| 1127 |
|
| 1128 |
iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); |
| 1129 |
|
| 1130 |
/* check if we got HEADER_DIGEST via the options */
|
| 1131 |
parse_header_digest(iscsi, iscsi_url->target); |
| 1132 |
|
| 1133 |
if (iscsi_full_connect_sync(iscsi, iscsi_url->portal, iscsi_url->lun) != 0) { |
| 1134 |
error_report("iSCSI: Failed to connect to LUN : %s",
|
| 1135 |
iscsi_get_error(iscsi)); |
| 1136 |
ret = -EINVAL; |
| 1137 |
goto out;
|
| 1138 |
} |
| 1139 |
|
| 1140 |
iscsilun->iscsi = iscsi; |
| 1141 |
iscsilun->lun = iscsi_url->lun; |
| 1142 |
|
| 1143 |
task = iscsi_inquiry_sync(iscsi, iscsilun->lun, 0, 0, 36); |
| 1144 |
|
| 1145 |
if (task == NULL || task->status != SCSI_STATUS_GOOD) { |
| 1146 |
error_report("iSCSI: failed to send inquiry command.");
|
| 1147 |
ret = -EINVAL; |
| 1148 |
goto out;
|
| 1149 |
} |
| 1150 |
|
| 1151 |
inq = scsi_datain_unmarshall(task); |
| 1152 |
if (inq == NULL) { |
| 1153 |
error_report("iSCSI: Failed to unmarshall inquiry data.");
|
| 1154 |
ret = -EINVAL; |
| 1155 |
goto out;
|
| 1156 |
} |
| 1157 |
|
| 1158 |
iscsilun->type = inq->periperal_device_type; |
| 1159 |
|
| 1160 |
if ((ret = iscsi_readcapacity_sync(iscsilun)) != 0) { |
| 1161 |
goto out;
|
| 1162 |
} |
| 1163 |
bs->total_sectors = sector_lun2qemu(iscsilun->num_blocks, iscsilun); |
| 1164 |
|
| 1165 |
/* Medium changer or tape. We dont have any emulation for this so this must
|
| 1166 |
* be sg ioctl compatible. We force it to be sg, otherwise qemu will try
|
| 1167 |
* to read from the device to guess the image format.
|
| 1168 |
*/
|
| 1169 |
if (iscsilun->type == TYPE_MEDIUM_CHANGER ||
|
| 1170 |
iscsilun->type == TYPE_TAPE) {
|
| 1171 |
bs->sg = 1;
|
| 1172 |
} |
| 1173 |
|
| 1174 |
#if defined(LIBISCSI_FEATURE_NOP_COUNTER)
|
| 1175 |
/* Set up a timer for sending out iSCSI NOPs */
|
| 1176 |
iscsilun->nop_timer = timer_new_ms(QEMU_CLOCK_REALTIME, iscsi_nop_timed_event, iscsilun); |
| 1177 |
timer_mod(iscsilun->nop_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); |
| 1178 |
#endif
|
| 1179 |
|
| 1180 |
out:
|
| 1181 |
qemu_opts_del(opts); |
| 1182 |
if (initiator_name != NULL) { |
| 1183 |
g_free(initiator_name); |
| 1184 |
} |
| 1185 |
if (iscsi_url != NULL) { |
| 1186 |
iscsi_destroy_url(iscsi_url); |
| 1187 |
} |
| 1188 |
if (task != NULL) { |
| 1189 |
scsi_free_scsi_task(task); |
| 1190 |
} |
| 1191 |
|
| 1192 |
if (ret) {
|
| 1193 |
if (iscsi != NULL) { |
| 1194 |
iscsi_destroy_context(iscsi); |
| 1195 |
} |
| 1196 |
memset(iscsilun, 0, sizeof(IscsiLun)); |
| 1197 |
} |
| 1198 |
return ret;
|
| 1199 |
} |
| 1200 |
|
| 1201 |
static void iscsi_close(BlockDriverState *bs) |
| 1202 |
{
|
| 1203 |
IscsiLun *iscsilun = bs->opaque; |
| 1204 |
struct iscsi_context *iscsi = iscsilun->iscsi;
|
| 1205 |
|
| 1206 |
if (iscsilun->nop_timer) {
|
| 1207 |
timer_del(iscsilun->nop_timer); |
| 1208 |
timer_free(iscsilun->nop_timer); |
| 1209 |
} |
| 1210 |
qemu_aio_set_fd_handler(iscsi_get_fd(iscsi), NULL, NULL, NULL); |
| 1211 |
iscsi_destroy_context(iscsi); |
| 1212 |
memset(iscsilun, 0, sizeof(IscsiLun)); |
| 1213 |
} |
| 1214 |
|
| 1215 |
static int iscsi_truncate(BlockDriverState *bs, int64_t offset) |
| 1216 |
{
|
| 1217 |
IscsiLun *iscsilun = bs->opaque; |
| 1218 |
int ret = 0; |
| 1219 |
|
| 1220 |
if (iscsilun->type != TYPE_DISK) {
|
| 1221 |
return -ENOTSUP;
|
| 1222 |
} |
| 1223 |
|
| 1224 |
if ((ret = iscsi_readcapacity_sync(iscsilun)) != 0) { |
| 1225 |
return ret;
|
| 1226 |
} |
| 1227 |
|
| 1228 |
if (offset > iscsi_getlength(bs)) {
|
| 1229 |
return -EINVAL;
|
| 1230 |
} |
| 1231 |
|
| 1232 |
return 0; |
| 1233 |
} |
| 1234 |
|
| 1235 |
static int iscsi_has_zero_init(BlockDriverState *bs) |
| 1236 |
{
|
| 1237 |
return 0; |
| 1238 |
} |
| 1239 |
|
| 1240 |
static int iscsi_create(const char *filename, QEMUOptionParameter *options) |
| 1241 |
{
|
| 1242 |
int ret = 0; |
| 1243 |
int64_t total_size = 0;
|
| 1244 |
BlockDriverState *bs; |
| 1245 |
IscsiLun *iscsilun = NULL;
|
| 1246 |
QDict *bs_options; |
| 1247 |
|
| 1248 |
bs = bdrv_new("");
|
| 1249 |
|
| 1250 |
/* Read out options */
|
| 1251 |
while (options && options->name) {
|
| 1252 |
if (!strcmp(options->name, "size")) { |
| 1253 |
total_size = options->value.n / BDRV_SECTOR_SIZE; |
| 1254 |
} |
| 1255 |
options++; |
| 1256 |
} |
| 1257 |
|
| 1258 |
bs->opaque = g_malloc0(sizeof(struct IscsiLun)); |
| 1259 |
iscsilun = bs->opaque; |
| 1260 |
|
| 1261 |
bs_options = qdict_new(); |
| 1262 |
qdict_put(bs_options, "filename", qstring_from_str(filename));
|
| 1263 |
ret = iscsi_open(bs, bs_options, 0);
|
| 1264 |
QDECREF(bs_options); |
| 1265 |
|
| 1266 |
if (ret != 0) { |
| 1267 |
goto out;
|
| 1268 |
} |
| 1269 |
if (iscsilun->nop_timer) {
|
| 1270 |
timer_del(iscsilun->nop_timer); |
| 1271 |
timer_free(iscsilun->nop_timer); |
| 1272 |
} |
| 1273 |
if (iscsilun->type != TYPE_DISK) {
|
| 1274 |
ret = -ENODEV; |
| 1275 |
goto out;
|
| 1276 |
} |
| 1277 |
if (bs->total_sectors < total_size) {
|
| 1278 |
ret = -ENOSPC; |
| 1279 |
goto out;
|
| 1280 |
} |
| 1281 |
|
| 1282 |
ret = 0;
|
| 1283 |
out:
|
| 1284 |
if (iscsilun->iscsi != NULL) { |
| 1285 |
iscsi_destroy_context(iscsilun->iscsi); |
| 1286 |
} |
| 1287 |
g_free(bs->opaque); |
| 1288 |
bs->opaque = NULL;
|
| 1289 |
bdrv_delete(bs); |
| 1290 |
return ret;
|
| 1291 |
} |
| 1292 |
|
| 1293 |
static QEMUOptionParameter iscsi_create_options[] = {
|
| 1294 |
{
|
| 1295 |
.name = BLOCK_OPT_SIZE, |
| 1296 |
.type = OPT_SIZE, |
| 1297 |
.help = "Virtual disk size"
|
| 1298 |
}, |
| 1299 |
{ NULL }
|
| 1300 |
}; |
| 1301 |
|
| 1302 |
static BlockDriver bdrv_iscsi = {
|
| 1303 |
.format_name = "iscsi",
|
| 1304 |
.protocol_name = "iscsi",
|
| 1305 |
|
| 1306 |
.instance_size = sizeof(IscsiLun),
|
| 1307 |
.bdrv_file_open = iscsi_open, |
| 1308 |
.bdrv_close = iscsi_close, |
| 1309 |
.bdrv_create = iscsi_create, |
| 1310 |
.create_options = iscsi_create_options, |
| 1311 |
|
| 1312 |
.bdrv_getlength = iscsi_getlength, |
| 1313 |
.bdrv_truncate = iscsi_truncate, |
| 1314 |
|
| 1315 |
.bdrv_aio_readv = iscsi_aio_readv, |
| 1316 |
.bdrv_aio_writev = iscsi_aio_writev, |
| 1317 |
.bdrv_aio_flush = iscsi_aio_flush, |
| 1318 |
|
| 1319 |
.bdrv_aio_discard = iscsi_aio_discard, |
| 1320 |
.bdrv_has_zero_init = iscsi_has_zero_init, |
| 1321 |
|
| 1322 |
#ifdef __linux__
|
| 1323 |
.bdrv_ioctl = iscsi_ioctl, |
| 1324 |
.bdrv_aio_ioctl = iscsi_aio_ioctl, |
| 1325 |
#endif
|
| 1326 |
}; |
| 1327 |
|
| 1328 |
static QemuOptsList qemu_iscsi_opts = {
|
| 1329 |
.name = "iscsi",
|
| 1330 |
.head = QTAILQ_HEAD_INITIALIZER(qemu_iscsi_opts.head), |
| 1331 |
.desc = {
|
| 1332 |
{
|
| 1333 |
.name = "user",
|
| 1334 |
.type = QEMU_OPT_STRING, |
| 1335 |
.help = "username for CHAP authentication to target",
|
| 1336 |
},{
|
| 1337 |
.name = "password",
|
| 1338 |
.type = QEMU_OPT_STRING, |
| 1339 |
.help = "password for CHAP authentication to target",
|
| 1340 |
},{
|
| 1341 |
.name = "header-digest",
|
| 1342 |
.type = QEMU_OPT_STRING, |
| 1343 |
.help = "HeaderDigest setting. "
|
| 1344 |
"{CRC32C|CRC32C-NONE|NONE-CRC32C|NONE}",
|
| 1345 |
},{
|
| 1346 |
.name = "initiator-name",
|
| 1347 |
.type = QEMU_OPT_STRING, |
| 1348 |
.help = "Initiator iqn name to use when connecting",
|
| 1349 |
}, |
| 1350 |
{ /* end of list */ }
|
| 1351 |
}, |
| 1352 |
}; |
| 1353 |
|
| 1354 |
static void iscsi_block_init(void) |
| 1355 |
{
|
| 1356 |
bdrv_register(&bdrv_iscsi); |
| 1357 |
qemu_add_opts(&qemu_iscsi_opts); |
| 1358 |
} |
| 1359 |
|
| 1360 |
block_init(iscsi_block_init); |