Without any complex checks we can't assume that an iscsi target is initialized to zero. Signed-off-by: Peter Lieven <pl@kamp.de> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
988 lines
26 KiB
C
988 lines
26 KiB
C
/*
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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-error.h"
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#include "block_int.h"
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#include "trace.h"
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#include "hw/scsi-defs.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 <hw/scsi-defs.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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} IscsiLun;
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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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size_t read_size;
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size_t read_offset;
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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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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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if (acb->canceled == 0) {
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acb->common.cb(acb->common.opaque, acb->status);
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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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qemu_aio_release(acb);
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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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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 int iscsi_process_flush(void *arg)
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{
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IscsiLun *iscsilun = arg;
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return iscsi_queue_length(iscsilun->iscsi) > 0;
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}
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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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iscsi_process_flush,
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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 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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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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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_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 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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struct iscsi_context *iscsi = iscsilun->iscsi;
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IscsiAIOCB *acb;
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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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struct iscsi_data data;
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acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque);
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trace_iscsi_aio_writev(iscsi, sector_num, nb_sectors, opaque, acb);
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acb->iscsilun = iscsilun;
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acb->qiov = qiov;
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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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/* XXX we should pass the iovec to write16 to avoid the extra copy */
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/* this will allow us to get rid of 'buf' completely */
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size = nb_sectors * BDRV_SECTOR_SIZE;
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acb->buf = g_malloc(size);
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qemu_iovec_to_buf(acb->qiov, 0, acb->buf, size);
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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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qemu_aio_release(acb);
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return NULL;
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}
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memset(acb->task, 0, sizeof(struct scsi_task));
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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(sector_num, 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 = size / iscsilun->block_size;
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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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data.data = acb->buf;
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data.size = size;
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if (iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task,
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iscsi_aio_write16_cb,
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&data,
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acb) != 0) {
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scsi_free_scsi_task(acb->task);
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g_free(acb->buf);
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qemu_aio_release(acb);
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return NULL;
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}
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iscsi_set_events(iscsilun);
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return &acb->common;
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}
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static void
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iscsi_aio_read16_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_read16_cb(iscsi, status, acb, acb->canceled);
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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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error_report("Failed to read16 data from 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 BlockDriverAIOCB *
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iscsi_aio_readv(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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struct iscsi_context *iscsi = iscsilun->iscsi;
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IscsiAIOCB *acb;
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size_t qemu_read_size;
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int i;
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uint64_t lba;
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uint32_t num_sectors;
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qemu_read_size = BDRV_SECTOR_SIZE * (size_t)nb_sectors;
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acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque);
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trace_iscsi_aio_readv(iscsi, sector_num, nb_sectors, opaque, acb);
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acb->iscsilun = iscsilun;
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acb->qiov = qiov;
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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->read_size = qemu_read_size;
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acb->buf = NULL;
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/* If LUN blocksize is bigger than BDRV_BLOCK_SIZE a read from QEMU
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* may be misaligned to the LUN, so we may need to read some extra
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* data.
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*/
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acb->read_offset = 0;
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if (iscsilun->block_size > BDRV_SECTOR_SIZE) {
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uint64_t bdrv_offset = BDRV_SECTOR_SIZE * sector_num;
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acb->read_offset = bdrv_offset % iscsilun->block_size;
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}
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num_sectors = (qemu_read_size + iscsilun->block_size
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+ acb->read_offset - 1)
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/ iscsilun->block_size;
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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 READ16 "
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"command. %s", iscsi_get_error(iscsi));
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qemu_aio_release(acb);
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return NULL;
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}
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memset(acb->task, 0, sizeof(struct scsi_task));
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acb->task->xfer_dir = SCSI_XFER_READ;
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lba = sector_qemu2lun(sector_num, iscsilun);
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acb->task->expxferlen = qemu_read_size;
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switch (iscsilun->type) {
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case TYPE_DISK:
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acb->task->cdb_size = 16;
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acb->task->cdb[0] = 0x88;
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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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*(uint32_t *)&acb->task->cdb[10] = htonl(num_sectors);
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break;
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default:
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acb->task->cdb_size = 10;
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acb->task->cdb[0] = 0x28;
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*(uint32_t *)&acb->task->cdb[2] = htonl(lba);
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*(uint16_t *)&acb->task->cdb[7] = htons(num_sectors);
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break;
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}
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if (iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task,
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iscsi_aio_read16_cb,
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NULL,
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acb) != 0) {
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scsi_free_scsi_task(acb->task);
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qemu_aio_release(acb);
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return NULL;
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}
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for (i = 0; i < acb->qiov->niov; i++) {
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scsi_task_add_data_in_buffer(acb->task,
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acb->qiov->iov[i].iov_len,
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acb->qiov->iov[i].iov_base);
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}
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iscsi_set_events(iscsilun);
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return &acb->common;
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}
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static void
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iscsi_synccache10_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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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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error_report("Failed to sync10 data on 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 BlockDriverAIOCB *
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iscsi_aio_flush(BlockDriverState *bs,
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BlockDriverCompletionFunc *cb, void *opaque)
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{
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IscsiLun *iscsilun = bs->opaque;
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struct iscsi_context *iscsi = iscsilun->iscsi;
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IscsiAIOCB *acb;
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acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque);
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acb->iscsilun = iscsilun;
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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->task = iscsi_synchronizecache10_task(iscsi, iscsilun->lun,
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0, 0, 0, 0,
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iscsi_synccache10_cb,
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acb);
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if (acb->task == NULL) {
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error_report("iSCSI: Failed to send synchronizecache10 command. %s",
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iscsi_get_error(iscsi));
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qemu_aio_release(acb);
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return NULL;
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}
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iscsi_set_events(iscsilun);
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return &acb->common;
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}
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static void
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iscsi_unmap_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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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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error_report("Failed to unmap data on 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 BlockDriverAIOCB *
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iscsi_aio_discard(BlockDriverState *bs,
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int64_t sector_num, int nb_sectors,
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BlockDriverCompletionFunc *cb, void *opaque)
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{
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IscsiLun *iscsilun = bs->opaque;
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struct iscsi_context *iscsi = iscsilun->iscsi;
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IscsiAIOCB *acb;
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struct unmap_list list[1];
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acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque);
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acb->iscsilun = iscsilun;
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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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list[0].lba = sector_qemu2lun(sector_num, iscsilun);
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list[0].num = nb_sectors * BDRV_SECTOR_SIZE / iscsilun->block_size;
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acb->task = iscsi_unmap_task(iscsi, iscsilun->lun,
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0, 0, &list[0], 1,
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iscsi_unmap_cb,
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acb);
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if (acb->task == NULL) {
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error_report("iSCSI: Failed to send unmap command. %s",
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iscsi_get_error(iscsi));
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qemu_aio_release(acb);
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return NULL;
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}
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iscsi_set_events(iscsilun);
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|
|
return &acb->common;
|
|
}
|
|
|
|
#ifdef __linux__
|
|
static void
|
|
iscsi_aio_ioctl_cb(struct iscsi_context *iscsi, int status,
|
|
void *command_data, void *opaque)
|
|
{
|
|
IscsiAIOCB *acb = opaque;
|
|
|
|
if (acb->canceled != 0) {
|
|
return;
|
|
}
|
|
|
|
acb->status = 0;
|
|
if (status < 0) {
|
|
error_report("Failed to ioctl(SG_IO) to iSCSI lun. %s",
|
|
iscsi_get_error(iscsi));
|
|
acb->status = -EIO;
|
|
}
|
|
|
|
acb->ioh->driver_status = 0;
|
|
acb->ioh->host_status = 0;
|
|
acb->ioh->resid = 0;
|
|
|
|
#define SG_ERR_DRIVER_SENSE 0x08
|
|
|
|
if (status == SCSI_STATUS_CHECK_CONDITION && acb->task->datain.size >= 2) {
|
|
int ss;
|
|
|
|
acb->ioh->driver_status |= SG_ERR_DRIVER_SENSE;
|
|
|
|
acb->ioh->sb_len_wr = acb->task->datain.size - 2;
|
|
ss = (acb->ioh->mx_sb_len >= acb->ioh->sb_len_wr) ?
|
|
acb->ioh->mx_sb_len : acb->ioh->sb_len_wr;
|
|
memcpy(acb->ioh->sbp, &acb->task->datain.data[2], ss);
|
|
}
|
|
|
|
iscsi_schedule_bh(acb);
|
|
}
|
|
|
|
static BlockDriverAIOCB *iscsi_aio_ioctl(BlockDriverState *bs,
|
|
unsigned long int req, void *buf,
|
|
BlockDriverCompletionFunc *cb, void *opaque)
|
|
{
|
|
IscsiLun *iscsilun = bs->opaque;
|
|
struct iscsi_context *iscsi = iscsilun->iscsi;
|
|
struct iscsi_data data;
|
|
IscsiAIOCB *acb;
|
|
|
|
assert(req == SG_IO);
|
|
|
|
acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque);
|
|
|
|
acb->iscsilun = iscsilun;
|
|
acb->canceled = 0;
|
|
acb->bh = NULL;
|
|
acb->status = -EINPROGRESS;
|
|
acb->buf = NULL;
|
|
acb->ioh = buf;
|
|
|
|
acb->task = malloc(sizeof(struct scsi_task));
|
|
if (acb->task == NULL) {
|
|
error_report("iSCSI: Failed to allocate task for scsi command. %s",
|
|
iscsi_get_error(iscsi));
|
|
qemu_aio_release(acb);
|
|
return NULL;
|
|
}
|
|
memset(acb->task, 0, sizeof(struct scsi_task));
|
|
|
|
switch (acb->ioh->dxfer_direction) {
|
|
case SG_DXFER_TO_DEV:
|
|
acb->task->xfer_dir = SCSI_XFER_WRITE;
|
|
break;
|
|
case SG_DXFER_FROM_DEV:
|
|
acb->task->xfer_dir = SCSI_XFER_READ;
|
|
break;
|
|
default:
|
|
acb->task->xfer_dir = SCSI_XFER_NONE;
|
|
break;
|
|
}
|
|
|
|
acb->task->cdb_size = acb->ioh->cmd_len;
|
|
memcpy(&acb->task->cdb[0], acb->ioh->cmdp, acb->ioh->cmd_len);
|
|
acb->task->expxferlen = acb->ioh->dxfer_len;
|
|
|
|
if (acb->task->xfer_dir == SCSI_XFER_WRITE) {
|
|
data.data = acb->ioh->dxferp;
|
|
data.size = acb->ioh->dxfer_len;
|
|
}
|
|
if (iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task,
|
|
iscsi_aio_ioctl_cb,
|
|
(acb->task->xfer_dir == SCSI_XFER_WRITE) ?
|
|
&data : NULL,
|
|
acb) != 0) {
|
|
scsi_free_scsi_task(acb->task);
|
|
qemu_aio_release(acb);
|
|
return NULL;
|
|
}
|
|
|
|
/* tell libiscsi to read straight into the buffer we got from ioctl */
|
|
if (acb->task->xfer_dir == SCSI_XFER_READ) {
|
|
scsi_task_add_data_in_buffer(acb->task,
|
|
acb->ioh->dxfer_len,
|
|
acb->ioh->dxferp);
|
|
}
|
|
|
|
iscsi_set_events(iscsilun);
|
|
|
|
return &acb->common;
|
|
}
|
|
|
|
|
|
static void ioctl_cb(void *opaque, int status)
|
|
{
|
|
int *p_status = opaque;
|
|
*p_status = status;
|
|
}
|
|
|
|
static int iscsi_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
|
|
{
|
|
IscsiLun *iscsilun = bs->opaque;
|
|
int status;
|
|
|
|
switch (req) {
|
|
case SG_GET_VERSION_NUM:
|
|
*(int *)buf = 30000;
|
|
break;
|
|
case SG_GET_SCSI_ID:
|
|
((struct sg_scsi_id *)buf)->scsi_type = iscsilun->type;
|
|
break;
|
|
case SG_IO:
|
|
status = -EINPROGRESS;
|
|
iscsi_aio_ioctl(bs, req, buf, ioctl_cb, &status);
|
|
|
|
while (status == -EINPROGRESS) {
|
|
qemu_aio_wait();
|
|
}
|
|
|
|
return 0;
|
|
default:
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static int64_t
|
|
iscsi_getlength(BlockDriverState *bs)
|
|
{
|
|
IscsiLun *iscsilun = bs->opaque;
|
|
int64_t len;
|
|
|
|
len = iscsilun->num_blocks;
|
|
len *= iscsilun->block_size;
|
|
|
|
return len;
|
|
}
|
|
|
|
static int parse_chap(struct iscsi_context *iscsi, const char *target)
|
|
{
|
|
QemuOptsList *list;
|
|
QemuOpts *opts;
|
|
const char *user = NULL;
|
|
const char *password = NULL;
|
|
|
|
list = qemu_find_opts("iscsi");
|
|
if (!list) {
|
|
return 0;
|
|
}
|
|
|
|
opts = qemu_opts_find(list, target);
|
|
if (opts == NULL) {
|
|
opts = QTAILQ_FIRST(&list->head);
|
|
if (!opts) {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
user = qemu_opt_get(opts, "user");
|
|
if (!user) {
|
|
return 0;
|
|
}
|
|
|
|
password = qemu_opt_get(opts, "password");
|
|
if (!password) {
|
|
error_report("CHAP username specified but no password was given");
|
|
return -1;
|
|
}
|
|
|
|
if (iscsi_set_initiator_username_pwd(iscsi, user, password)) {
|
|
error_report("Failed to set initiator username and password");
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void parse_header_digest(struct iscsi_context *iscsi, const char *target)
|
|
{
|
|
QemuOptsList *list;
|
|
QemuOpts *opts;
|
|
const char *digest = NULL;
|
|
|
|
list = qemu_find_opts("iscsi");
|
|
if (!list) {
|
|
return;
|
|
}
|
|
|
|
opts = qemu_opts_find(list, target);
|
|
if (opts == NULL) {
|
|
opts = QTAILQ_FIRST(&list->head);
|
|
if (!opts) {
|
|
return;
|
|
}
|
|
}
|
|
|
|
digest = qemu_opt_get(opts, "header-digest");
|
|
if (!digest) {
|
|
return;
|
|
}
|
|
|
|
if (!strcmp(digest, "CRC32C")) {
|
|
iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C);
|
|
} else if (!strcmp(digest, "NONE")) {
|
|
iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE);
|
|
} else if (!strcmp(digest, "CRC32C-NONE")) {
|
|
iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C_NONE);
|
|
} else if (!strcmp(digest, "NONE-CRC32C")) {
|
|
iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C);
|
|
} else {
|
|
error_report("Invalid header-digest setting : %s", digest);
|
|
}
|
|
}
|
|
|
|
static char *parse_initiator_name(const char *target)
|
|
{
|
|
QemuOptsList *list;
|
|
QemuOpts *opts;
|
|
const char *name = NULL;
|
|
const char *iscsi_name = qemu_get_vm_name();
|
|
|
|
list = qemu_find_opts("iscsi");
|
|
if (list) {
|
|
opts = qemu_opts_find(list, target);
|
|
if (!opts) {
|
|
opts = QTAILQ_FIRST(&list->head);
|
|
}
|
|
if (opts) {
|
|
name = qemu_opt_get(opts, "initiator-name");
|
|
}
|
|
}
|
|
|
|
if (name) {
|
|
return g_strdup(name);
|
|
} else {
|
|
return g_strdup_printf("iqn.2008-11.org.linux-kvm%s%s",
|
|
iscsi_name ? ":" : "",
|
|
iscsi_name ? iscsi_name : "");
|
|
}
|
|
}
|
|
|
|
/*
|
|
* We support iscsi url's on the form
|
|
* iscsi://[<username>%<password>@]<host>[:<port>]/<targetname>/<lun>
|
|
*/
|
|
static int iscsi_open(BlockDriverState *bs, const char *filename, int flags)
|
|
{
|
|
IscsiLun *iscsilun = bs->opaque;
|
|
struct iscsi_context *iscsi = NULL;
|
|
struct iscsi_url *iscsi_url = NULL;
|
|
struct scsi_task *task = NULL;
|
|
struct scsi_inquiry_standard *inq = NULL;
|
|
struct scsi_readcapacity10 *rc10 = NULL;
|
|
struct scsi_readcapacity16 *rc16 = NULL;
|
|
char *initiator_name = NULL;
|
|
int ret;
|
|
|
|
if ((BDRV_SECTOR_SIZE % 512) != 0) {
|
|
error_report("iSCSI: Invalid BDRV_SECTOR_SIZE. "
|
|
"BDRV_SECTOR_SIZE(%lld) is not a multiple "
|
|
"of 512", BDRV_SECTOR_SIZE);
|
|
return -EINVAL;
|
|
}
|
|
|
|
iscsi_url = iscsi_parse_full_url(iscsi, filename);
|
|
if (iscsi_url == NULL) {
|
|
error_report("Failed to parse URL : %s", filename);
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
memset(iscsilun, 0, sizeof(IscsiLun));
|
|
|
|
initiator_name = parse_initiator_name(iscsi_url->target);
|
|
|
|
iscsi = iscsi_create_context(initiator_name);
|
|
if (iscsi == NULL) {
|
|
error_report("iSCSI: Failed to create iSCSI context.");
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
if (iscsi_set_targetname(iscsi, iscsi_url->target)) {
|
|
error_report("iSCSI: Failed to set target name.");
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
if (iscsi_url->user != NULL) {
|
|
ret = iscsi_set_initiator_username_pwd(iscsi, iscsi_url->user,
|
|
iscsi_url->passwd);
|
|
if (ret != 0) {
|
|
error_report("Failed to set initiator username and password");
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/* check if we got CHAP username/password via the options */
|
|
if (parse_chap(iscsi, iscsi_url->target) != 0) {
|
|
error_report("iSCSI: Failed to set CHAP user/password");
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
if (iscsi_set_session_type(iscsi, ISCSI_SESSION_NORMAL) != 0) {
|
|
error_report("iSCSI: Failed to set session type to normal.");
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C);
|
|
|
|
/* check if we got HEADER_DIGEST via the options */
|
|
parse_header_digest(iscsi, iscsi_url->target);
|
|
|
|
if (iscsi_full_connect_sync(iscsi, iscsi_url->portal, iscsi_url->lun) != 0) {
|
|
error_report("iSCSI: Failed to connect to LUN : %s",
|
|
iscsi_get_error(iscsi));
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
iscsilun->iscsi = iscsi;
|
|
iscsilun->lun = iscsi_url->lun;
|
|
|
|
task = iscsi_inquiry_sync(iscsi, iscsilun->lun, 0, 0, 36);
|
|
|
|
if (task == NULL || task->status != SCSI_STATUS_GOOD) {
|
|
error_report("iSCSI: failed to send inquiry command.");
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
inq = scsi_datain_unmarshall(task);
|
|
if (inq == NULL) {
|
|
error_report("iSCSI: Failed to unmarshall inquiry data.");
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
iscsilun->type = inq->periperal_device_type;
|
|
|
|
scsi_free_scsi_task(task);
|
|
|
|
switch (iscsilun->type) {
|
|
case TYPE_DISK:
|
|
task = iscsi_readcapacity16_sync(iscsi, iscsilun->lun);
|
|
if (task == NULL || task->status != SCSI_STATUS_GOOD) {
|
|
error_report("iSCSI: failed to send readcapacity16 command.");
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
rc16 = scsi_datain_unmarshall(task);
|
|
if (rc16 == NULL) {
|
|
error_report("iSCSI: Failed to unmarshall readcapacity16 data.");
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
iscsilun->block_size = rc16->block_length;
|
|
iscsilun->num_blocks = rc16->returned_lba + 1;
|
|
break;
|
|
case TYPE_ROM:
|
|
task = iscsi_readcapacity10_sync(iscsi, iscsilun->lun, 0, 0);
|
|
if (task == NULL || task->status != SCSI_STATUS_GOOD) {
|
|
error_report("iSCSI: failed to send readcapacity10 command.");
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
rc10 = scsi_datain_unmarshall(task);
|
|
if (rc10 == NULL) {
|
|
error_report("iSCSI: Failed to unmarshall readcapacity10 data.");
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
iscsilun->block_size = rc10->block_size;
|
|
if (rc10->lba == 0) {
|
|
/* blank disk loaded */
|
|
iscsilun->num_blocks = 0;
|
|
} else {
|
|
iscsilun->num_blocks = rc10->lba + 1;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
bs->total_sectors = iscsilun->num_blocks *
|
|
iscsilun->block_size / BDRV_SECTOR_SIZE ;
|
|
|
|
/* Medium changer or tape. We dont have any emulation for this so this must
|
|
* be sg ioctl compatible. We force it to be sg, otherwise qemu will try
|
|
* to read from the device to guess the image format.
|
|
*/
|
|
if (iscsilun->type == TYPE_MEDIUM_CHANGER ||
|
|
iscsilun->type == TYPE_TAPE) {
|
|
bs->sg = 1;
|
|
}
|
|
|
|
ret = 0;
|
|
|
|
out:
|
|
if (initiator_name != NULL) {
|
|
g_free(initiator_name);
|
|
}
|
|
if (iscsi_url != NULL) {
|
|
iscsi_destroy_url(iscsi_url);
|
|
}
|
|
if (task != NULL) {
|
|
scsi_free_scsi_task(task);
|
|
}
|
|
|
|
if (ret) {
|
|
if (iscsi != NULL) {
|
|
iscsi_destroy_context(iscsi);
|
|
}
|
|
memset(iscsilun, 0, sizeof(IscsiLun));
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static void iscsi_close(BlockDriverState *bs)
|
|
{
|
|
IscsiLun *iscsilun = bs->opaque;
|
|
struct iscsi_context *iscsi = iscsilun->iscsi;
|
|
|
|
qemu_aio_set_fd_handler(iscsi_get_fd(iscsi), NULL, NULL, NULL, NULL);
|
|
iscsi_destroy_context(iscsi);
|
|
memset(iscsilun, 0, sizeof(IscsiLun));
|
|
}
|
|
|
|
static int iscsi_has_zero_init(BlockDriverState *bs)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static BlockDriver bdrv_iscsi = {
|
|
.format_name = "iscsi",
|
|
.protocol_name = "iscsi",
|
|
|
|
.instance_size = sizeof(IscsiLun),
|
|
.bdrv_file_open = iscsi_open,
|
|
.bdrv_close = iscsi_close,
|
|
|
|
.bdrv_getlength = iscsi_getlength,
|
|
|
|
.bdrv_aio_readv = iscsi_aio_readv,
|
|
.bdrv_aio_writev = iscsi_aio_writev,
|
|
.bdrv_aio_flush = iscsi_aio_flush,
|
|
|
|
.bdrv_aio_discard = iscsi_aio_discard,
|
|
.bdrv_has_zero_init = iscsi_has_zero_init,
|
|
|
|
#ifdef __linux__
|
|
.bdrv_ioctl = iscsi_ioctl,
|
|
.bdrv_aio_ioctl = iscsi_aio_ioctl,
|
|
#endif
|
|
};
|
|
|
|
static void iscsi_block_init(void)
|
|
{
|
|
bdrv_register(&bdrv_iscsi);
|
|
}
|
|
|
|
block_init(iscsi_block_init);
|