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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.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; |
321 |
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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; |
341 |
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acb->read_offset = bdrv_offset % iscsilun->block_size; |
343 |
} |
344 |
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num_sectors = (qemu_read_size + iscsilun->block_size |
346 |
+ acb->read_offset - 1)
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/ iscsilun->block_size; |
348 |
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acb->task = malloc(sizeof(struct scsi_task)); |
350 |
if (acb->task == NULL) { |
351 |
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); |
354 |
return NULL; |
355 |
} |
356 |
memset(acb->task, 0, sizeof(struct scsi_task)); |
357 |
|
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acb->task->xfer_dir = SCSI_XFER_READ; |
359 |
lba = sector_qemu2lun(sector_num, iscsilun); |
360 |
acb->task->expxferlen = qemu_read_size; |
361 |
|
362 |
switch (iscsilun->type) {
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363 |
case TYPE_DISK:
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364 |
acb->task->cdb_size = 16;
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acb->task->cdb[0] = 0x88; |
366 |
*(uint32_t *)&acb->task->cdb[2] = htonl(lba >> 32); |
367 |
*(uint32_t *)&acb->task->cdb[6] = htonl(lba & 0xffffffff); |
368 |
*(uint32_t *)&acb->task->cdb[10] = htonl(num_sectors);
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break;
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default:
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371 |
acb->task->cdb_size = 10;
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acb->task->cdb[0] = 0x28; |
373 |
*(uint32_t *)&acb->task->cdb[2] = htonl(lba);
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374 |
*(uint16_t *)&acb->task->cdb[7] = htons(num_sectors);
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375 |
break;
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376 |
} |
377 |
|
378 |
if (iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task,
|
379 |
iscsi_aio_read16_cb, |
380 |
NULL,
|
381 |
acb) != 0) {
|
382 |
scsi_free_scsi_task(acb->task); |
383 |
qemu_aio_release(acb); |
384 |
return NULL; |
385 |
} |
386 |
|
387 |
for (i = 0; i < acb->qiov->niov; i++) { |
388 |
scsi_task_add_data_in_buffer(acb->task, |
389 |
acb->qiov->iov[i].iov_len, |
390 |
acb->qiov->iov[i].iov_base); |
391 |
} |
392 |
|
393 |
iscsi_set_events(iscsilun); |
394 |
|
395 |
return &acb->common;
|
396 |
} |
397 |
|
398 |
|
399 |
static void |
400 |
iscsi_synccache10_cb(struct iscsi_context *iscsi, int status, |
401 |
void *command_data, void *opaque) |
402 |
{ |
403 |
IscsiAIOCB *acb = opaque; |
404 |
|
405 |
if (acb->canceled != 0) { |
406 |
return;
|
407 |
} |
408 |
|
409 |
acb->status = 0;
|
410 |
if (status < 0) { |
411 |
error_report("Failed to sync10 data on iSCSI lun. %s",
|
412 |
iscsi_get_error(iscsi)); |
413 |
acb->status = -EIO; |
414 |
} |
415 |
|
416 |
iscsi_schedule_bh(acb); |
417 |
} |
418 |
|
419 |
static BlockDriverAIOCB *
|
420 |
iscsi_aio_flush(BlockDriverState *bs, |
421 |
BlockDriverCompletionFunc *cb, void *opaque)
|
422 |
{ |
423 |
IscsiLun *iscsilun = bs->opaque; |
424 |
struct iscsi_context *iscsi = iscsilun->iscsi;
|
425 |
IscsiAIOCB *acb; |
426 |
|
427 |
acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque); |
428 |
|
429 |
acb->iscsilun = iscsilun; |
430 |
acb->canceled = 0;
|
431 |
acb->bh = NULL;
|
432 |
acb->status = -EINPROGRESS; |
433 |
|
434 |
acb->task = iscsi_synchronizecache10_task(iscsi, iscsilun->lun, |
435 |
0, 0, 0, 0, |
436 |
iscsi_synccache10_cb, |
437 |
acb); |
438 |
if (acb->task == NULL) { |
439 |
error_report("iSCSI: Failed to send synchronizecache10 command. %s",
|
440 |
iscsi_get_error(iscsi)); |
441 |
qemu_aio_release(acb); |
442 |
return NULL; |
443 |
} |
444 |
|
445 |
iscsi_set_events(iscsilun); |
446 |
|
447 |
return &acb->common;
|
448 |
} |
449 |
|
450 |
static void |
451 |
iscsi_unmap_cb(struct iscsi_context *iscsi, int status, |
452 |
void *command_data, void *opaque) |
453 |
{ |
454 |
IscsiAIOCB *acb = opaque; |
455 |
|
456 |
if (acb->canceled != 0) { |
457 |
return;
|
458 |
} |
459 |
|
460 |
acb->status = 0;
|
461 |
if (status < 0) { |
462 |
error_report("Failed to unmap data on iSCSI lun. %s",
|
463 |
iscsi_get_error(iscsi)); |
464 |
acb->status = -EIO; |
465 |
} |
466 |
|
467 |
iscsi_schedule_bh(acb); |
468 |
} |
469 |
|
470 |
static BlockDriverAIOCB *
|
471 |
iscsi_aio_discard(BlockDriverState *bs, |
472 |
int64_t sector_num, int nb_sectors,
|
473 |
BlockDriverCompletionFunc *cb, void *opaque)
|
474 |
{ |
475 |
IscsiLun *iscsilun = bs->opaque; |
476 |
struct iscsi_context *iscsi = iscsilun->iscsi;
|
477 |
IscsiAIOCB *acb; |
478 |
struct unmap_list list[1]; |
479 |
|
480 |
acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque); |
481 |
|
482 |
acb->iscsilun = iscsilun; |
483 |
acb->canceled = 0;
|
484 |
acb->bh = NULL;
|
485 |
acb->status = -EINPROGRESS; |
486 |
|
487 |
list[0].lba = sector_qemu2lun(sector_num, iscsilun);
|
488 |
list[0].num = nb_sectors * BDRV_SECTOR_SIZE / iscsilun->block_size;
|
489 |
|
490 |
acb->task = iscsi_unmap_task(iscsi, iscsilun->lun, |
491 |
0, 0, &list[0], 1, |
492 |
iscsi_unmap_cb, |
493 |
acb); |
494 |
if (acb->task == NULL) { |
495 |
error_report("iSCSI: Failed to send unmap command. %s",
|
496 |
iscsi_get_error(iscsi)); |
497 |
qemu_aio_release(acb); |
498 |
return NULL; |
499 |
} |
500 |
|
501 |
iscsi_set_events(iscsilun); |
502 |
|
503 |
return &acb->common;
|
504 |
} |
505 |
|
506 |
#ifdef __linux__
|
507 |
static void |
508 |
iscsi_aio_ioctl_cb(struct iscsi_context *iscsi, int status, |
509 |
void *command_data, void *opaque) |
510 |
{ |
511 |
IscsiAIOCB *acb = opaque; |
512 |
|
513 |
if (acb->canceled != 0) { |
514 |
return;
|
515 |
} |
516 |
|
517 |
acb->status = 0;
|
518 |
if (status < 0) { |
519 |
error_report("Failed to ioctl(SG_IO) to iSCSI lun. %s",
|
520 |
iscsi_get_error(iscsi)); |
521 |
acb->status = -EIO; |
522 |
} |
523 |
|
524 |
acb->ioh->driver_status = 0;
|
525 |
acb->ioh->host_status = 0;
|
526 |
acb->ioh->resid = 0;
|
527 |
|
528 |
#define SG_ERR_DRIVER_SENSE 0x08 |
529 |
|
530 |
if (status == SCSI_STATUS_CHECK_CONDITION && acb->task->datain.size >= 2) { |
531 |
int ss;
|
532 |
|
533 |
acb->ioh->driver_status |= SG_ERR_DRIVER_SENSE; |
534 |
|
535 |
acb->ioh->sb_len_wr = acb->task->datain.size - 2;
|
536 |
ss = (acb->ioh->mx_sb_len >= acb->ioh->sb_len_wr) ? |
537 |
acb->ioh->mx_sb_len : acb->ioh->sb_len_wr; |
538 |
memcpy(acb->ioh->sbp, &acb->task->datain.data[2], ss);
|
539 |
} |
540 |
|
541 |
iscsi_schedule_bh(acb); |
542 |
} |
543 |
|
544 |
static BlockDriverAIOCB *iscsi_aio_ioctl(BlockDriverState *bs,
|
545 |
unsigned long int req, void *buf, |
546 |
BlockDriverCompletionFunc *cb, void *opaque)
|
547 |
{ |
548 |
IscsiLun *iscsilun = bs->opaque; |
549 |
struct iscsi_context *iscsi = iscsilun->iscsi;
|
550 |
struct iscsi_data data;
|
551 |
IscsiAIOCB *acb; |
552 |
|
553 |
assert(req == SG_IO); |
554 |
|
555 |
acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque); |
556 |
|
557 |
acb->iscsilun = iscsilun; |
558 |
acb->canceled = 0;
|
559 |
acb->bh = NULL;
|
560 |
acb->status = -EINPROGRESS; |
561 |
acb->buf = NULL;
|
562 |
acb->ioh = buf; |
563 |
|
564 |
acb->task = malloc(sizeof(struct scsi_task)); |
565 |
if (acb->task == NULL) { |
566 |
error_report("iSCSI: Failed to allocate task for scsi command. %s",
|
567 |
iscsi_get_error(iscsi)); |
568 |
qemu_aio_release(acb); |
569 |
return NULL; |
570 |
} |
571 |
memset(acb->task, 0, sizeof(struct scsi_task)); |
572 |
|
573 |
switch (acb->ioh->dxfer_direction) {
|
574 |
case SG_DXFER_TO_DEV:
|
575 |
acb->task->xfer_dir = SCSI_XFER_WRITE; |
576 |
break;
|
577 |
case SG_DXFER_FROM_DEV:
|
578 |
acb->task->xfer_dir = SCSI_XFER_READ; |
579 |
break;
|
580 |
default:
|
581 |
acb->task->xfer_dir = SCSI_XFER_NONE; |
582 |
break;
|
583 |
} |
584 |
|
585 |
acb->task->cdb_size = acb->ioh->cmd_len; |
586 |
memcpy(&acb->task->cdb[0], acb->ioh->cmdp, acb->ioh->cmd_len);
|
587 |
acb->task->expxferlen = acb->ioh->dxfer_len; |
588 |
|
589 |
if (acb->task->xfer_dir == SCSI_XFER_WRITE) {
|
590 |
data.data = acb->ioh->dxferp; |
591 |
data.size = acb->ioh->dxfer_len; |
592 |
} |
593 |
if (iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task,
|
594 |
iscsi_aio_ioctl_cb, |
595 |
(acb->task->xfer_dir == SCSI_XFER_WRITE) ? |
596 |
&data : NULL,
|
597 |
acb) != 0) {
|
598 |
scsi_free_scsi_task(acb->task); |
599 |
qemu_aio_release(acb); |
600 |
return NULL; |
601 |
} |
602 |
|
603 |
/* tell libiscsi to read straight into the buffer we got from ioctl */
|
604 |
if (acb->task->xfer_dir == SCSI_XFER_READ) {
|
605 |
scsi_task_add_data_in_buffer(acb->task, |
606 |
acb->ioh->dxfer_len, |
607 |
acb->ioh->dxferp); |
608 |
} |
609 |
|
610 |
iscsi_set_events(iscsilun); |
611 |
|
612 |
return &acb->common;
|
613 |
} |
614 |
|
615 |
|
616 |
static void ioctl_cb(void *opaque, int status) |
617 |
{ |
618 |
int *p_status = opaque;
|
619 |
*p_status = status; |
620 |
} |
621 |
|
622 |
static int iscsi_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) |
623 |
{ |
624 |
IscsiLun *iscsilun = bs->opaque; |
625 |
int status;
|
626 |
|
627 |
switch (req) {
|
628 |
case SG_GET_VERSION_NUM:
|
629 |
*(int *)buf = 30000; |
630 |
break;
|
631 |
case SG_GET_SCSI_ID:
|
632 |
((struct sg_scsi_id *)buf)->scsi_type = iscsilun->type;
|
633 |
break;
|
634 |
case SG_IO:
|
635 |
status = -EINPROGRESS; |
636 |
iscsi_aio_ioctl(bs, req, buf, ioctl_cb, &status); |
637 |
|
638 |
while (status == -EINPROGRESS) {
|
639 |
qemu_aio_wait(); |
640 |
} |
641 |
|
642 |
return 0; |
643 |
default:
|
644 |
return -1; |
645 |
} |
646 |
return 0; |
647 |
} |
648 |
#endif
|
649 |
|
650 |
static int64_t
|
651 |
iscsi_getlength(BlockDriverState *bs) |
652 |
{ |
653 |
IscsiLun *iscsilun = bs->opaque; |
654 |
int64_t len; |
655 |
|
656 |
len = iscsilun->num_blocks; |
657 |
len *= iscsilun->block_size; |
658 |
|
659 |
return len;
|
660 |
} |
661 |
|
662 |
static int parse_chap(struct iscsi_context *iscsi, const char *target) |
663 |
{ |
664 |
QemuOptsList *list; |
665 |
QemuOpts *opts; |
666 |
const char *user = NULL; |
667 |
const char *password = NULL; |
668 |
|
669 |
list = qemu_find_opts("iscsi");
|
670 |
if (!list) {
|
671 |
return 0; |
672 |
} |
673 |
|
674 |
opts = qemu_opts_find(list, target); |
675 |
if (opts == NULL) { |
676 |
opts = QTAILQ_FIRST(&list->head); |
677 |
if (!opts) {
|
678 |
return 0; |
679 |
} |
680 |
} |
681 |
|
682 |
user = qemu_opt_get(opts, "user");
|
683 |
if (!user) {
|
684 |
return 0; |
685 |
} |
686 |
|
687 |
password = qemu_opt_get(opts, "password");
|
688 |
if (!password) {
|
689 |
error_report("CHAP username specified but no password was given");
|
690 |
return -1; |
691 |
} |
692 |
|
693 |
if (iscsi_set_initiator_username_pwd(iscsi, user, password)) {
|
694 |
error_report("Failed to set initiator username and password");
|
695 |
return -1; |
696 |
} |
697 |
|
698 |
return 0; |
699 |
} |
700 |
|
701 |
static void parse_header_digest(struct iscsi_context *iscsi, const char *target) |
702 |
{ |
703 |
QemuOptsList *list; |
704 |
QemuOpts *opts; |
705 |
const char *digest = NULL; |
706 |
|
707 |
list = qemu_find_opts("iscsi");
|
708 |
if (!list) {
|
709 |
return;
|
710 |
} |
711 |
|
712 |
opts = qemu_opts_find(list, target); |
713 |
if (opts == NULL) { |
714 |
opts = QTAILQ_FIRST(&list->head); |
715 |
if (!opts) {
|
716 |
return;
|
717 |
} |
718 |
} |
719 |
|
720 |
digest = qemu_opt_get(opts, "header-digest");
|
721 |
if (!digest) {
|
722 |
return;
|
723 |
} |
724 |
|
725 |
if (!strcmp(digest, "CRC32C")) { |
726 |
iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C); |
727 |
} else if (!strcmp(digest, "NONE")) { |
728 |
iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE); |
729 |
} else if (!strcmp(digest, "CRC32C-NONE")) { |
730 |
iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C_NONE); |
731 |
} else if (!strcmp(digest, "NONE-CRC32C")) { |
732 |
iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); |
733 |
} else {
|
734 |
error_report("Invalid header-digest setting : %s", digest);
|
735 |
} |
736 |
} |
737 |
|
738 |
static char *parse_initiator_name(const char *target) |
739 |
{ |
740 |
QemuOptsList *list; |
741 |
QemuOpts *opts; |
742 |
const char *name = NULL; |
743 |
const char *iscsi_name = qemu_get_vm_name(); |
744 |
|
745 |
list = qemu_find_opts("iscsi");
|
746 |
if (list) {
|
747 |
opts = qemu_opts_find(list, target); |
748 |
if (!opts) {
|
749 |
opts = QTAILQ_FIRST(&list->head); |
750 |
} |
751 |
if (opts) {
|
752 |
name = qemu_opt_get(opts, "initiator-name");
|
753 |
} |
754 |
} |
755 |
|
756 |
if (name) {
|
757 |
return g_strdup(name);
|
758 |
} else {
|
759 |
return g_strdup_printf("iqn.2008-11.org.linux-kvm%s%s", |
760 |
iscsi_name ? ":" : "", |
761 |
iscsi_name ? iscsi_name : "");
|
762 |
} |
763 |
} |
764 |
|
765 |
/*
|
766 |
* We support iscsi url's on the form
|
767 |
* iscsi://[<username>%<password>@]<host>[:<port>]/<targetname>/<lun>
|
768 |
*/
|
769 |
static int iscsi_open(BlockDriverState *bs, const char *filename, int flags) |
770 |
{ |
771 |
IscsiLun *iscsilun = bs->opaque; |
772 |
struct iscsi_context *iscsi = NULL; |
773 |
struct iscsi_url *iscsi_url = NULL; |
774 |
struct scsi_task *task = NULL; |
775 |
struct scsi_inquiry_standard *inq = NULL; |
776 |
struct scsi_readcapacity10 *rc10 = NULL; |
777 |
struct scsi_readcapacity16 *rc16 = NULL; |
778 |
char *initiator_name = NULL; |
779 |
int ret;
|
780 |
|
781 |
if ((BDRV_SECTOR_SIZE % 512) != 0) { |
782 |
error_report("iSCSI: Invalid BDRV_SECTOR_SIZE. "
|
783 |
"BDRV_SECTOR_SIZE(%lld) is not a multiple "
|
784 |
"of 512", BDRV_SECTOR_SIZE);
|
785 |
return -EINVAL;
|
786 |
} |
787 |
|
788 |
iscsi_url = iscsi_parse_full_url(iscsi, filename); |
789 |
if (iscsi_url == NULL) { |
790 |
error_report("Failed to parse URL : %s", filename);
|
791 |
ret = -EINVAL; |
792 |
goto out;
|
793 |
} |
794 |
|
795 |
memset(iscsilun, 0, sizeof(IscsiLun)); |
796 |
|
797 |
initiator_name = parse_initiator_name(iscsi_url->target); |
798 |
|
799 |
iscsi = iscsi_create_context(initiator_name); |
800 |
if (iscsi == NULL) { |
801 |
error_report("iSCSI: Failed to create iSCSI context.");
|
802 |
ret = -ENOMEM; |
803 |
goto out;
|
804 |
} |
805 |
|
806 |
if (iscsi_set_targetname(iscsi, iscsi_url->target)) {
|
807 |
error_report("iSCSI: Failed to set target name.");
|
808 |
ret = -EINVAL; |
809 |
goto out;
|
810 |
} |
811 |
|
812 |
if (iscsi_url->user != NULL) { |
813 |
ret = iscsi_set_initiator_username_pwd(iscsi, iscsi_url->user, |
814 |
iscsi_url->passwd); |
815 |
if (ret != 0) { |
816 |
error_report("Failed to set initiator username and password");
|
817 |
ret = -EINVAL; |
818 |
goto out;
|
819 |
} |
820 |
} |
821 |
|
822 |
/* check if we got CHAP username/password via the options */
|
823 |
if (parse_chap(iscsi, iscsi_url->target) != 0) { |
824 |
error_report("iSCSI: Failed to set CHAP user/password");
|
825 |
ret = -EINVAL; |
826 |
goto out;
|
827 |
} |
828 |
|
829 |
if (iscsi_set_session_type(iscsi, ISCSI_SESSION_NORMAL) != 0) { |
830 |
error_report("iSCSI: Failed to set session type to normal.");
|
831 |
ret = -EINVAL; |
832 |
goto out;
|
833 |
} |
834 |
|
835 |
iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); |
836 |
|
837 |
/* check if we got HEADER_DIGEST via the options */
|
838 |
parse_header_digest(iscsi, iscsi_url->target); |
839 |
|
840 |
if (iscsi_full_connect_sync(iscsi, iscsi_url->portal, iscsi_url->lun) != 0) { |
841 |
error_report("iSCSI: Failed to connect to LUN : %s",
|
842 |
iscsi_get_error(iscsi)); |
843 |
ret = -EINVAL; |
844 |
goto out;
|
845 |
} |
846 |
|
847 |
iscsilun->iscsi = iscsi; |
848 |
iscsilun->lun = iscsi_url->lun; |
849 |
|
850 |
task = iscsi_inquiry_sync(iscsi, iscsilun->lun, 0, 0, 36); |
851 |
|
852 |
if (task == NULL || task->status != SCSI_STATUS_GOOD) { |
853 |
error_report("iSCSI: failed to send inquiry command.");
|
854 |
ret = -EINVAL; |
855 |
goto out;
|
856 |
} |
857 |
|
858 |
inq = scsi_datain_unmarshall(task); |
859 |
if (inq == NULL) { |
860 |
error_report("iSCSI: Failed to unmarshall inquiry data.");
|
861 |
ret = -EINVAL; |
862 |
goto out;
|
863 |
} |
864 |
|
865 |
iscsilun->type = inq->periperal_device_type; |
866 |
|
867 |
scsi_free_scsi_task(task); |
868 |
|
869 |
switch (iscsilun->type) {
|
870 |
case TYPE_DISK:
|
871 |
task = iscsi_readcapacity16_sync(iscsi, iscsilun->lun); |
872 |
if (task == NULL || task->status != SCSI_STATUS_GOOD) { |
873 |
error_report("iSCSI: failed to send readcapacity16 command.");
|
874 |
ret = -EINVAL; |
875 |
goto out;
|
876 |
} |
877 |
rc16 = scsi_datain_unmarshall(task); |
878 |
if (rc16 == NULL) { |
879 |
error_report("iSCSI: Failed to unmarshall readcapacity16 data.");
|
880 |
ret = -EINVAL; |
881 |
goto out;
|
882 |
} |
883 |
iscsilun->block_size = rc16->block_length; |
884 |
iscsilun->num_blocks = rc16->returned_lba + 1;
|
885 |
break;
|
886 |
case TYPE_ROM:
|
887 |
task = iscsi_readcapacity10_sync(iscsi, iscsilun->lun, 0, 0); |
888 |
if (task == NULL || task->status != SCSI_STATUS_GOOD) { |
889 |
error_report("iSCSI: failed to send readcapacity10 command.");
|
890 |
ret = -EINVAL; |
891 |
goto out;
|
892 |
} |
893 |
rc10 = scsi_datain_unmarshall(task); |
894 |
if (rc10 == NULL) { |
895 |
error_report("iSCSI: Failed to unmarshall readcapacity10 data.");
|
896 |
ret = -EINVAL; |
897 |
goto out;
|
898 |
} |
899 |
iscsilun->block_size = rc10->block_size; |
900 |
if (rc10->lba == 0) { |
901 |
/* blank disk loaded */
|
902 |
iscsilun->num_blocks = 0;
|
903 |
} else {
|
904 |
iscsilun->num_blocks = rc10->lba + 1;
|
905 |
} |
906 |
break;
|
907 |
default:
|
908 |
break;
|
909 |
} |
910 |
|
911 |
bs->total_sectors = iscsilun->num_blocks * |
912 |
iscsilun->block_size / BDRV_SECTOR_SIZE ; |
913 |
|
914 |
/* Medium changer or tape. We dont have any emulation for this so this must
|
915 |
* be sg ioctl compatible. We force it to be sg, otherwise qemu will try
|
916 |
* to read from the device to guess the image format.
|
917 |
*/
|
918 |
if (iscsilun->type == TYPE_MEDIUM_CHANGER ||
|
919 |
iscsilun->type == TYPE_TAPE) { |
920 |
bs->sg = 1;
|
921 |
} |
922 |
|
923 |
ret = 0;
|
924 |
|
925 |
out:
|
926 |
if (initiator_name != NULL) { |
927 |
g_free(initiator_name); |
928 |
} |
929 |
if (iscsi_url != NULL) { |
930 |
iscsi_destroy_url(iscsi_url); |
931 |
} |
932 |
if (task != NULL) { |
933 |
scsi_free_scsi_task(task); |
934 |
} |
935 |
|
936 |
if (ret) {
|
937 |
if (iscsi != NULL) { |
938 |
iscsi_destroy_context(iscsi); |
939 |
} |
940 |
memset(iscsilun, 0, sizeof(IscsiLun)); |
941 |
} |
942 |
return ret;
|
943 |
} |
944 |
|
945 |
static void iscsi_close(BlockDriverState *bs) |
946 |
{ |
947 |
IscsiLun *iscsilun = bs->opaque; |
948 |
struct iscsi_context *iscsi = iscsilun->iscsi;
|
949 |
|
950 |
qemu_aio_set_fd_handler(iscsi_get_fd(iscsi), NULL, NULL, NULL, NULL); |
951 |
iscsi_destroy_context(iscsi); |
952 |
memset(iscsilun, 0, sizeof(IscsiLun)); |
953 |
} |
954 |
|
955 |
static int iscsi_has_zero_init(BlockDriverState *bs) |
956 |
{ |
957 |
return 0; |
958 |
} |
959 |
|
960 |
static BlockDriver bdrv_iscsi = {
|
961 |
.format_name = "iscsi",
|
962 |
.protocol_name = "iscsi",
|
963 |
|
964 |
.instance_size = sizeof(IscsiLun),
|
965 |
.bdrv_file_open = iscsi_open, |
966 |
.bdrv_close = iscsi_close, |
967 |
|
968 |
.bdrv_getlength = iscsi_getlength, |
969 |
|
970 |
.bdrv_aio_readv = iscsi_aio_readv, |
971 |
.bdrv_aio_writev = iscsi_aio_writev, |
972 |
.bdrv_aio_flush = iscsi_aio_flush, |
973 |
|
974 |
.bdrv_aio_discard = iscsi_aio_discard, |
975 |
.bdrv_has_zero_init = iscsi_has_zero_init, |
976 |
|
977 |
#ifdef __linux__
|
978 |
.bdrv_ioctl = iscsi_ioctl, |
979 |
.bdrv_aio_ioctl = iscsi_aio_ioctl, |
980 |
#endif
|
981 |
}; |
982 |
|
983 |
static void iscsi_block_init(void) |
984 |
{ |
985 |
bdrv_register(&bdrv_iscsi); |
986 |
} |
987 |
|
988 |
block_init(iscsi_block_init); |