1540 lines
43 KiB
C
1540 lines
43 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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* Copyright (c) 2012-2013 Peter Lieven <pl@kamp.de>
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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 "sysemu/sysemu.h"
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#include "qmp-commands.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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uint8_t lbpme;
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uint8_t lbprz;
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uint8_t has_write_same;
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struct scsi_inquiry_logical_block_provisioning lbp;
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struct scsi_inquiry_block_limits bl;
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unsigned char *zeroblock;
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} IscsiLun;
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typedef struct IscsiTask {
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int status;
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int complete;
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int retries;
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int do_retry;
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struct scsi_task *task;
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Coroutine *co;
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QEMUBH *bh;
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} IscsiTask;
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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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#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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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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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 iscsi_co_generic_bh_cb(void *opaque)
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{
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struct IscsiTask *iTask = opaque;
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qemu_bh_delete(iTask->bh);
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qemu_coroutine_enter(iTask->co, NULL);
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}
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static void
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iscsi_co_generic_cb(struct iscsi_context *iscsi, int status,
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void *command_data, void *opaque)
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{
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struct IscsiTask *iTask = opaque;
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struct scsi_task *task = command_data;
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iTask->complete = 1;
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iTask->status = status;
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iTask->do_retry = 0;
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iTask->task = task;
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if (iTask->retries-- > 0 && status == SCSI_STATUS_CHECK_CONDITION
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&& task->sense.key == SCSI_SENSE_UNIT_ATTENTION) {
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error_report("iSCSI CheckCondition: %s", iscsi_get_error(iscsi));
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iTask->do_retry = 1;
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goto out;
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}
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if (status != SCSI_STATUS_GOOD) {
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error_report("iSCSI Failure: %s", iscsi_get_error(iscsi));
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}
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out:
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if (iTask->co) {
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iTask->bh = qemu_bh_new(iscsi_co_generic_bh_cb, iTask);
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qemu_bh_schedule(iTask->bh);
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}
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}
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static void iscsi_co_init_iscsitask(IscsiLun *iscsilun, struct IscsiTask *iTask)
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{
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*iTask = (struct IscsiTask) {
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.co = qemu_coroutine_self(),
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.retries = ISCSI_CMD_RETRIES,
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};
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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 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 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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static int coroutine_fn iscsi_co_writev(BlockDriverState *bs,
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int64_t sector_num, int nb_sectors,
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QEMUIOVector *iov)
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{
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IscsiLun *iscsilun = bs->opaque;
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struct IscsiTask iTask;
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uint64_t lba;
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uint32_t num_sectors;
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uint8_t *data = NULL;
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uint8_t *buf = NULL;
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if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) {
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return -EINVAL;
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}
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lba = sector_qemu2lun(sector_num, iscsilun);
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num_sectors = sector_qemu2lun(nb_sectors, iscsilun);
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#if !defined(LIBISCSI_FEATURE_IOVECTOR)
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/* if the iovec only contains one buffer we can pass it directly */
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if (iov->niov == 1) {
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data = iov->iov[0].iov_base;
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} else {
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size_t size = MIN(nb_sectors * BDRV_SECTOR_SIZE, iov->size);
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buf = g_malloc(size);
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qemu_iovec_to_buf(iov, 0, buf, size);
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data = buf;
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}
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#endif
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iscsi_co_init_iscsitask(iscsilun, &iTask);
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retry:
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iTask.task = iscsi_write16_task(iscsilun->iscsi, iscsilun->lun, lba,
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data, num_sectors * iscsilun->block_size,
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iscsilun->block_size, 0, 0, 0, 0, 0,
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iscsi_co_generic_cb, &iTask);
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if (iTask.task == NULL) {
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g_free(buf);
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return -ENOMEM;
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}
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#if defined(LIBISCSI_FEATURE_IOVECTOR)
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scsi_task_set_iov_out(iTask.task, (struct scsi_iovec *) iov->iov,
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iov->niov);
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#endif
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while (!iTask.complete) {
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iscsi_set_events(iscsilun);
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qemu_coroutine_yield();
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}
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if (iTask.task != NULL) {
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scsi_free_scsi_task(iTask.task);
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iTask.task = NULL;
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}
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if (iTask.do_retry) {
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iTask.complete = 0;
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goto retry;
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}
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g_free(buf);
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if (iTask.status != SCSI_STATUS_GOOD) {
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return -EIO;
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}
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return 0;
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}
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static int coroutine_fn iscsi_co_readv(BlockDriverState *bs,
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int64_t sector_num, int nb_sectors,
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QEMUIOVector *iov)
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{
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IscsiLun *iscsilun = bs->opaque;
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struct IscsiTask iTask;
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uint64_t lba;
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uint32_t num_sectors;
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#if !defined(LIBISCSI_FEATURE_IOVECTOR)
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int i;
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#endif
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if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) {
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return -EINVAL;
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}
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lba = sector_qemu2lun(sector_num, iscsilun);
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num_sectors = sector_qemu2lun(nb_sectors, iscsilun);
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iscsi_co_init_iscsitask(iscsilun, &iTask);
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retry:
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switch (iscsilun->type) {
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case TYPE_DISK:
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iTask.task = iscsi_read16_task(iscsilun->iscsi, iscsilun->lun, lba,
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num_sectors * iscsilun->block_size,
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iscsilun->block_size, 0, 0, 0, 0, 0,
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iscsi_co_generic_cb, &iTask);
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break;
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default:
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iTask.task = iscsi_read10_task(iscsilun->iscsi, iscsilun->lun, lba,
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num_sectors * iscsilun->block_size,
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iscsilun->block_size,
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#if !defined(CONFIG_LIBISCSI_1_4) /* API change from 1.4.0 to 1.5.0 */
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0, 0, 0, 0, 0,
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#endif
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iscsi_co_generic_cb, &iTask);
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break;
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}
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if (iTask.task == NULL) {
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return -ENOMEM;
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}
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#if defined(LIBISCSI_FEATURE_IOVECTOR)
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scsi_task_set_iov_in(iTask.task, (struct scsi_iovec *) iov->iov, iov->niov);
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#else
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for (i = 0; i < iov->niov; i++) {
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scsi_task_add_data_in_buffer(iTask.task,
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iov->iov[i].iov_len,
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iov->iov[i].iov_base);
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}
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#endif
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while (!iTask.complete) {
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iscsi_set_events(iscsilun);
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qemu_coroutine_yield();
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}
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|
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if (iTask.task != NULL) {
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scsi_free_scsi_task(iTask.task);
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iTask.task = NULL;
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}
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|
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if (iTask.do_retry) {
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iTask.complete = 0;
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goto retry;
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}
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|
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if (iTask.status != SCSI_STATUS_GOOD) {
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return -EIO;
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}
|
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|
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return 0;
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}
|
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|
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static int coroutine_fn iscsi_co_flush(BlockDriverState *bs)
|
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{
|
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IscsiLun *iscsilun = bs->opaque;
|
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struct IscsiTask iTask;
|
|
|
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if (bs->sg) {
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return 0;
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}
|
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|
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iscsi_co_init_iscsitask(iscsilun, &iTask);
|
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|
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retry:
|
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if (iscsi_synchronizecache10_task(iscsilun->iscsi, iscsilun->lun, 0, 0, 0,
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0, iscsi_co_generic_cb, &iTask) == NULL) {
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return -ENOMEM;
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}
|
|
|
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while (!iTask.complete) {
|
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iscsi_set_events(iscsilun);
|
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qemu_coroutine_yield();
|
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}
|
|
|
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if (iTask.task != NULL) {
|
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scsi_free_scsi_task(iTask.task);
|
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iTask.task = NULL;
|
|
}
|
|
|
|
if (iTask.do_retry) {
|
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iTask.complete = 0;
|
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goto retry;
|
|
}
|
|
|
|
if (iTask.status != SCSI_STATUS_GOOD) {
|
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return -EIO;
|
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}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef __linux__
|
|
static void
|
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iscsi_aio_ioctl_cb(struct iscsi_context *iscsi, int status,
|
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void *command_data, void *opaque)
|
|
{
|
|
IscsiAIOCB *acb = opaque;
|
|
|
|
g_free(acb->buf);
|
|
acb->buf = NULL;
|
|
|
|
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;
|
|
|
|
data.size = 0;
|
|
if (acb->task->xfer_dir == SCSI_XFER_WRITE) {
|
|
if (acb->ioh->iovec_count == 0) {
|
|
data.data = acb->ioh->dxferp;
|
|
data.size = acb->ioh->dxfer_len;
|
|
} else {
|
|
#if defined(LIBISCSI_FEATURE_IOVECTOR)
|
|
scsi_task_set_iov_out(acb->task,
|
|
(struct scsi_iovec *) acb->ioh->dxferp,
|
|
acb->ioh->iovec_count);
|
|
#else
|
|
struct iovec *iov = (struct iovec *)acb->ioh->dxferp;
|
|
|
|
acb->buf = g_malloc(acb->ioh->dxfer_len);
|
|
data.data = acb->buf;
|
|
data.size = iov_to_buf(iov, acb->ioh->iovec_count, 0,
|
|
acb->buf, acb->ioh->dxfer_len);
|
|
#endif
|
|
}
|
|
}
|
|
|
|
if (iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task,
|
|
iscsi_aio_ioctl_cb,
|
|
(data.size > 0) ? &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) {
|
|
if (acb->ioh->iovec_count == 0) {
|
|
scsi_task_add_data_in_buffer(acb->task,
|
|
acb->ioh->dxfer_len,
|
|
acb->ioh->dxferp);
|
|
} else {
|
|
#if defined(LIBISCSI_FEATURE_IOVECTOR)
|
|
scsi_task_set_iov_in(acb->task,
|
|
(struct scsi_iovec *) acb->ioh->dxferp,
|
|
acb->ioh->iovec_count);
|
|
#else
|
|
int i;
|
|
for (i = 0; i < acb->ioh->iovec_count; i++) {
|
|
struct iovec *iov = (struct iovec *)acb->ioh->dxferp;
|
|
|
|
scsi_task_add_data_in_buffer(acb->task,
|
|
iov[i].iov_len,
|
|
iov[i].iov_base);
|
|
}
|
|
#endif
|
|
}
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
#if defined(LIBISCSI_FEATURE_IOVECTOR)
|
|
|
|
static int64_t coroutine_fn iscsi_co_get_block_status(BlockDriverState *bs,
|
|
int64_t sector_num,
|
|
int nb_sectors, int *pnum)
|
|
{
|
|
IscsiLun *iscsilun = bs->opaque;
|
|
struct scsi_get_lba_status *lbas = NULL;
|
|
struct scsi_lba_status_descriptor *lbasd = NULL;
|
|
struct IscsiTask iTask;
|
|
int64_t ret;
|
|
|
|
iscsi_co_init_iscsitask(iscsilun, &iTask);
|
|
|
|
if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
/* default to all sectors allocated */
|
|
ret = BDRV_BLOCK_DATA;
|
|
ret |= (sector_num << BDRV_SECTOR_BITS) | BDRV_BLOCK_OFFSET_VALID;
|
|
*pnum = nb_sectors;
|
|
|
|
/* LUN does not support logical block provisioning */
|
|
if (iscsilun->lbpme == 0) {
|
|
goto out;
|
|
}
|
|
|
|
retry:
|
|
if (iscsi_get_lba_status_task(iscsilun->iscsi, iscsilun->lun,
|
|
sector_qemu2lun(sector_num, iscsilun),
|
|
8 + 16, iscsi_co_generic_cb,
|
|
&iTask) == NULL) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
while (!iTask.complete) {
|
|
iscsi_set_events(iscsilun);
|
|
qemu_coroutine_yield();
|
|
}
|
|
|
|
if (iTask.do_retry) {
|
|
if (iTask.task != NULL) {
|
|
scsi_free_scsi_task(iTask.task);
|
|
iTask.task = NULL;
|
|
}
|
|
iTask.complete = 0;
|
|
goto retry;
|
|
}
|
|
|
|
if (iTask.status != SCSI_STATUS_GOOD) {
|
|
/* in case the get_lba_status_callout fails (i.e.
|
|
* because the device is busy or the cmd is not
|
|
* supported) we pretend all blocks are allocated
|
|
* for backwards compatibility */
|
|
goto out;
|
|
}
|
|
|
|
lbas = scsi_datain_unmarshall(iTask.task);
|
|
if (lbas == NULL) {
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
|
|
lbasd = &lbas->descriptors[0];
|
|
|
|
if (sector_qemu2lun(sector_num, iscsilun) != lbasd->lba) {
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
|
|
*pnum = sector_lun2qemu(lbasd->num_blocks, iscsilun);
|
|
if (*pnum > nb_sectors) {
|
|
*pnum = nb_sectors;
|
|
}
|
|
|
|
if (lbasd->provisioning == SCSI_PROVISIONING_TYPE_DEALLOCATED ||
|
|
lbasd->provisioning == SCSI_PROVISIONING_TYPE_ANCHORED) {
|
|
ret &= ~BDRV_BLOCK_DATA;
|
|
if (iscsilun->lbprz) {
|
|
ret |= BDRV_BLOCK_ZERO;
|
|
}
|
|
}
|
|
|
|
out:
|
|
if (iTask.task != NULL) {
|
|
scsi_free_scsi_task(iTask.task);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
#endif /* LIBISCSI_FEATURE_IOVECTOR */
|
|
|
|
static int
|
|
coroutine_fn iscsi_co_discard(BlockDriverState *bs, int64_t sector_num,
|
|
int nb_sectors)
|
|
{
|
|
IscsiLun *iscsilun = bs->opaque;
|
|
struct IscsiTask iTask;
|
|
struct unmap_list list;
|
|
|
|
if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!iscsilun->lbp.lbpu) {
|
|
/* UNMAP is not supported by the target */
|
|
return 0;
|
|
}
|
|
|
|
list.lba = sector_qemu2lun(sector_num, iscsilun);
|
|
list.num = sector_qemu2lun(nb_sectors, iscsilun);
|
|
|
|
iscsi_co_init_iscsitask(iscsilun, &iTask);
|
|
retry:
|
|
if (iscsi_unmap_task(iscsilun->iscsi, iscsilun->lun, 0, 0, &list, 1,
|
|
iscsi_co_generic_cb, &iTask) == NULL) {
|
|
return -ENOMEM;
|
|
}
|
|
|
|
while (!iTask.complete) {
|
|
iscsi_set_events(iscsilun);
|
|
qemu_coroutine_yield();
|
|
}
|
|
|
|
if (iTask.task != NULL) {
|
|
scsi_free_scsi_task(iTask.task);
|
|
iTask.task = NULL;
|
|
}
|
|
|
|
if (iTask.do_retry) {
|
|
iTask.complete = 0;
|
|
goto retry;
|
|
}
|
|
|
|
if (iTask.status == SCSI_STATUS_CHECK_CONDITION) {
|
|
/* the target might fail with a check condition if it
|
|
is not happy with the alignment of the UNMAP request
|
|
we silently fail in this case */
|
|
return 0;
|
|
}
|
|
|
|
if (iTask.status != SCSI_STATUS_GOOD) {
|
|
return -EIO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#if defined(SCSI_SENSE_ASCQ_CAPACITY_DATA_HAS_CHANGED)
|
|
|
|
static int
|
|
coroutine_fn iscsi_co_write_zeroes(BlockDriverState *bs, int64_t sector_num,
|
|
int nb_sectors, BdrvRequestFlags flags)
|
|
{
|
|
IscsiLun *iscsilun = bs->opaque;
|
|
struct IscsiTask iTask;
|
|
uint64_t lba;
|
|
uint32_t nb_blocks;
|
|
|
|
if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!(flags & BDRV_REQ_MAY_UNMAP) && !iscsilun->has_write_same) {
|
|
/* WRITE SAME without UNMAP is not supported by the target */
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
if ((flags & BDRV_REQ_MAY_UNMAP) && !iscsilun->lbp.lbpws) {
|
|
/* WRITE SAME with UNMAP is not supported by the target */
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
lba = sector_qemu2lun(sector_num, iscsilun);
|
|
nb_blocks = sector_qemu2lun(nb_sectors, iscsilun);
|
|
|
|
if (iscsilun->zeroblock == NULL) {
|
|
iscsilun->zeroblock = g_malloc0(iscsilun->block_size);
|
|
}
|
|
|
|
iscsi_co_init_iscsitask(iscsilun, &iTask);
|
|
retry:
|
|
if (iscsi_writesame16_task(iscsilun->iscsi, iscsilun->lun, lba,
|
|
iscsilun->zeroblock, iscsilun->block_size,
|
|
nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP),
|
|
0, 0, iscsi_co_generic_cb, &iTask) == NULL) {
|
|
return -ENOMEM;
|
|
}
|
|
|
|
while (!iTask.complete) {
|
|
iscsi_set_events(iscsilun);
|
|
qemu_coroutine_yield();
|
|
}
|
|
|
|
if (iTask.status == SCSI_STATUS_CHECK_CONDITION &&
|
|
iTask.task->sense.key == SCSI_SENSE_ILLEGAL_REQUEST &&
|
|
(iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_OPERATION_CODE ||
|
|
iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_FIELD_IN_CDB)) {
|
|
/* WRITE SAME is not supported by the target */
|
|
iscsilun->has_write_same = false;
|
|
scsi_free_scsi_task(iTask.task);
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
if (iTask.task != NULL) {
|
|
scsi_free_scsi_task(iTask.task);
|
|
iTask.task = NULL;
|
|
}
|
|
|
|
if (iTask.do_retry) {
|
|
iTask.complete = 0;
|
|
goto retry;
|
|
}
|
|
|
|
if (iTask.status != SCSI_STATUS_GOOD) {
|
|
return -EIO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#endif /* SCSI_SENSE_ASCQ_CAPACITY_DATA_HAS_CHANGED */
|
|
|
|
static void parse_chap(struct iscsi_context *iscsi, const char *target,
|
|
Error **errp)
|
|
{
|
|
QemuOptsList *list;
|
|
QemuOpts *opts;
|
|
const char *user = NULL;
|
|
const char *password = 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;
|
|
}
|
|
}
|
|
|
|
user = qemu_opt_get(opts, "user");
|
|
if (!user) {
|
|
return;
|
|
}
|
|
|
|
password = qemu_opt_get(opts, "password");
|
|
if (!password) {
|
|
error_setg(errp, "CHAP username specified but no password was given");
|
|
return;
|
|
}
|
|
|
|
if (iscsi_set_initiator_username_pwd(iscsi, user, password)) {
|
|
error_setg(errp, "Failed to set initiator username and password");
|
|
}
|
|
}
|
|
|
|
static void parse_header_digest(struct iscsi_context *iscsi, const char *target,
|
|
Error **errp)
|
|
{
|
|
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_setg(errp, "Invalid header-digest setting : %s", digest);
|
|
}
|
|
}
|
|
|
|
static char *parse_initiator_name(const char *target)
|
|
{
|
|
QemuOptsList *list;
|
|
QemuOpts *opts;
|
|
const char *name;
|
|
char *iscsi_name;
|
|
UuidInfo *uuid_info;
|
|
|
|
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);
|
|
}
|
|
}
|
|
}
|
|
|
|
uuid_info = qmp_query_uuid(NULL);
|
|
if (strcmp(uuid_info->UUID, UUID_NONE) == 0) {
|
|
name = qemu_get_vm_name();
|
|
} else {
|
|
name = uuid_info->UUID;
|
|
}
|
|
iscsi_name = g_strdup_printf("iqn.2008-11.org.linux-kvm%s%s",
|
|
name ? ":" : "", name ? name : "");
|
|
qapi_free_UuidInfo(uuid_info);
|
|
return iscsi_name;
|
|
}
|
|
|
|
#if defined(LIBISCSI_FEATURE_NOP_COUNTER)
|
|
static void iscsi_nop_timed_event(void *opaque)
|
|
{
|
|
IscsiLun *iscsilun = opaque;
|
|
|
|
if (iscsi_get_nops_in_flight(iscsilun->iscsi) > MAX_NOP_FAILURES) {
|
|
error_report("iSCSI: NOP timeout. Reconnecting...");
|
|
iscsi_reconnect(iscsilun->iscsi);
|
|
}
|
|
|
|
if (iscsi_nop_out_async(iscsilun->iscsi, NULL, NULL, 0, NULL) != 0) {
|
|
error_report("iSCSI: failed to sent NOP-Out. Disabling NOP messages.");
|
|
return;
|
|
}
|
|
|
|
timer_mod(iscsilun->nop_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL);
|
|
iscsi_set_events(iscsilun);
|
|
}
|
|
#endif
|
|
|
|
static void iscsi_readcapacity_sync(IscsiLun *iscsilun, Error **errp)
|
|
{
|
|
struct scsi_task *task = NULL;
|
|
struct scsi_readcapacity10 *rc10 = NULL;
|
|
struct scsi_readcapacity16 *rc16 = NULL;
|
|
int retries = ISCSI_CMD_RETRIES;
|
|
|
|
do {
|
|
if (task != NULL) {
|
|
scsi_free_scsi_task(task);
|
|
task = NULL;
|
|
}
|
|
|
|
switch (iscsilun->type) {
|
|
case TYPE_DISK:
|
|
task = iscsi_readcapacity16_sync(iscsilun->iscsi, iscsilun->lun);
|
|
if (task != NULL && task->status == SCSI_STATUS_GOOD) {
|
|
rc16 = scsi_datain_unmarshall(task);
|
|
if (rc16 == NULL) {
|
|
error_setg(errp, "iSCSI: Failed to unmarshall readcapacity16 data.");
|
|
} else {
|
|
iscsilun->block_size = rc16->block_length;
|
|
iscsilun->num_blocks = rc16->returned_lba + 1;
|
|
iscsilun->lbpme = rc16->lbpme;
|
|
iscsilun->lbprz = rc16->lbprz;
|
|
}
|
|
}
|
|
break;
|
|
case TYPE_ROM:
|
|
task = iscsi_readcapacity10_sync(iscsilun->iscsi, iscsilun->lun, 0, 0);
|
|
if (task != NULL && task->status == SCSI_STATUS_GOOD) {
|
|
rc10 = scsi_datain_unmarshall(task);
|
|
if (rc10 == NULL) {
|
|
error_setg(errp, "iSCSI: Failed to unmarshall readcapacity10 data.");
|
|
} else {
|
|
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:
|
|
return;
|
|
}
|
|
} while (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION
|
|
&& task->sense.key == SCSI_SENSE_UNIT_ATTENTION
|
|
&& retries-- > 0);
|
|
|
|
if (task == NULL || task->status != SCSI_STATUS_GOOD) {
|
|
error_setg(errp, "iSCSI: failed to send readcapacity10 command.");
|
|
}
|
|
if (task) {
|
|
scsi_free_scsi_task(task);
|
|
}
|
|
}
|
|
|
|
/* TODO Convert to fine grained options */
|
|
static QemuOptsList runtime_opts = {
|
|
.name = "iscsi",
|
|
.head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
|
|
.desc = {
|
|
{
|
|
.name = "filename",
|
|
.type = QEMU_OPT_STRING,
|
|
.help = "URL to the iscsi image",
|
|
},
|
|
{ /* end of list */ }
|
|
},
|
|
};
|
|
|
|
static struct scsi_task *iscsi_do_inquiry(struct iscsi_context *iscsi, int lun,
|
|
int evpd, int pc, void **inq, Error **errp)
|
|
{
|
|
int full_size;
|
|
struct scsi_task *task = NULL;
|
|
task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, 64);
|
|
if (task == NULL || task->status != SCSI_STATUS_GOOD) {
|
|
goto fail;
|
|
}
|
|
full_size = scsi_datain_getfullsize(task);
|
|
if (full_size > task->datain.size) {
|
|
scsi_free_scsi_task(task);
|
|
|
|
/* we need more data for the full list */
|
|
task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, full_size);
|
|
if (task == NULL || task->status != SCSI_STATUS_GOOD) {
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
*inq = scsi_datain_unmarshall(task);
|
|
if (*inq == NULL) {
|
|
error_setg(errp, "iSCSI: failed to unmarshall inquiry datain blob");
|
|
goto fail;
|
|
}
|
|
|
|
return task;
|
|
|
|
fail:
|
|
if (!error_is_set(errp)) {
|
|
error_setg(errp, "iSCSI: Inquiry command failed : %s",
|
|
iscsi_get_error(iscsi));
|
|
}
|
|
if (task != NULL) {
|
|
scsi_free_scsi_task(task);
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* We support iscsi url's on the form
|
|
* iscsi://[<username>%<password>@]<host>[:<port>]/<targetname>/<lun>
|
|
*
|
|
* Note: flags are currently not used by iscsi_open. If this function
|
|
* is changed such that flags are used, please examine iscsi_reopen_prepare()
|
|
* to see if needs to be changed as well.
|
|
*/
|
|
static int iscsi_open(BlockDriverState *bs, QDict *options, int flags,
|
|
Error **errp)
|
|
{
|
|
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_inquiry_supported_pages *inq_vpd;
|
|
char *initiator_name = NULL;
|
|
QemuOpts *opts;
|
|
Error *local_err = NULL;
|
|
const char *filename;
|
|
int i, ret;
|
|
|
|
if ((BDRV_SECTOR_SIZE % 512) != 0) {
|
|
error_setg(errp, "iSCSI: Invalid BDRV_SECTOR_SIZE. "
|
|
"BDRV_SECTOR_SIZE(%lld) is not a multiple "
|
|
"of 512", BDRV_SECTOR_SIZE);
|
|
return -EINVAL;
|
|
}
|
|
|
|
opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
|
|
qemu_opts_absorb_qdict(opts, options, &local_err);
|
|
if (local_err) {
|
|
error_propagate(errp, local_err);
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
filename = qemu_opt_get(opts, "filename");
|
|
|
|
iscsi_url = iscsi_parse_full_url(iscsi, filename);
|
|
if (iscsi_url == NULL) {
|
|
error_setg(errp, "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_setg(errp, "iSCSI: Failed to create iSCSI context.");
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
if (iscsi_set_targetname(iscsi, iscsi_url->target)) {
|
|
error_setg(errp, "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_setg(errp, "Failed to set initiator username and password");
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/* check if we got CHAP username/password via the options */
|
|
parse_chap(iscsi, iscsi_url->target, &local_err);
|
|
if (local_err != NULL) {
|
|
error_propagate(errp, local_err);
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
if (iscsi_set_session_type(iscsi, ISCSI_SESSION_NORMAL) != 0) {
|
|
error_setg(errp, "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, &local_err);
|
|
if (local_err != NULL) {
|
|
error_propagate(errp, local_err);
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
if (iscsi_full_connect_sync(iscsi, iscsi_url->portal, iscsi_url->lun) != 0) {
|
|
error_setg(errp, "iSCSI: Failed to connect to LUN : %s",
|
|
iscsi_get_error(iscsi));
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
iscsilun->iscsi = iscsi;
|
|
iscsilun->lun = iscsi_url->lun;
|
|
iscsilun->has_write_same = true;
|
|
|
|
task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 0, 0,
|
|
(void **) &inq, errp);
|
|
if (task == NULL) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
iscsilun->type = inq->periperal_device_type;
|
|
scsi_free_scsi_task(task);
|
|
task = NULL;
|
|
|
|
iscsi_readcapacity_sync(iscsilun, &local_err);
|
|
if (local_err != NULL) {
|
|
error_propagate(errp, local_err);
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
bs->total_sectors = sector_lun2qemu(iscsilun->num_blocks, iscsilun);
|
|
bs->request_alignment = iscsilun->block_size;
|
|
|
|
/* We don't have any emulation for devices other than disks and CD-ROMs, 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_DISK && iscsilun->type != TYPE_ROM) {
|
|
bs->sg = 1;
|
|
}
|
|
|
|
task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,
|
|
SCSI_INQUIRY_PAGECODE_SUPPORTED_VPD_PAGES,
|
|
(void **) &inq_vpd, errp);
|
|
if (task == NULL) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
for (i = 0; i < inq_vpd->num_pages; i++) {
|
|
struct scsi_task *inq_task;
|
|
struct scsi_inquiry_logical_block_provisioning *inq_lbp;
|
|
struct scsi_inquiry_block_limits *inq_bl;
|
|
switch (inq_vpd->pages[i]) {
|
|
case SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING:
|
|
inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,
|
|
SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING,
|
|
(void **) &inq_lbp, errp);
|
|
if (inq_task == NULL) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
memcpy(&iscsilun->lbp, inq_lbp,
|
|
sizeof(struct scsi_inquiry_logical_block_provisioning));
|
|
scsi_free_scsi_task(inq_task);
|
|
break;
|
|
case SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS:
|
|
inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,
|
|
SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS,
|
|
(void **) &inq_bl, errp);
|
|
if (inq_task == NULL) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
memcpy(&iscsilun->bl, inq_bl,
|
|
sizeof(struct scsi_inquiry_block_limits));
|
|
scsi_free_scsi_task(inq_task);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
scsi_free_scsi_task(task);
|
|
task = NULL;
|
|
|
|
#if defined(LIBISCSI_FEATURE_NOP_COUNTER)
|
|
/* Set up a timer for sending out iSCSI NOPs */
|
|
iscsilun->nop_timer = timer_new_ms(QEMU_CLOCK_REALTIME, iscsi_nop_timed_event, iscsilun);
|
|
timer_mod(iscsilun->nop_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL);
|
|
#endif
|
|
|
|
out:
|
|
qemu_opts_del(opts);
|
|
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;
|
|
|
|
if (iscsilun->nop_timer) {
|
|
timer_del(iscsilun->nop_timer);
|
|
timer_free(iscsilun->nop_timer);
|
|
}
|
|
qemu_aio_set_fd_handler(iscsi_get_fd(iscsi), NULL, NULL, NULL);
|
|
iscsi_destroy_context(iscsi);
|
|
g_free(iscsilun->zeroblock);
|
|
memset(iscsilun, 0, sizeof(IscsiLun));
|
|
}
|
|
|
|
static int iscsi_refresh_limits(BlockDriverState *bs)
|
|
{
|
|
IscsiLun *iscsilun = bs->opaque;
|
|
|
|
/* We don't actually refresh here, but just return data queried in
|
|
* iscsi_open(): iscsi targets don't change their limits. */
|
|
if (iscsilun->lbp.lbpu) {
|
|
if (iscsilun->bl.max_unmap < 0xffffffff) {
|
|
bs->bl.max_discard = sector_lun2qemu(iscsilun->bl.max_unmap,
|
|
iscsilun);
|
|
}
|
|
bs->bl.discard_alignment = sector_lun2qemu(iscsilun->bl.opt_unmap_gran,
|
|
iscsilun);
|
|
}
|
|
|
|
if (iscsilun->bl.max_ws_len < 0xffffffff) {
|
|
bs->bl.max_write_zeroes = sector_lun2qemu(iscsilun->bl.max_ws_len,
|
|
iscsilun);
|
|
}
|
|
if (iscsilun->lbp.lbpws) {
|
|
bs->bl.write_zeroes_alignment = sector_lun2qemu(iscsilun->bl.opt_unmap_gran,
|
|
iscsilun);
|
|
}
|
|
bs->bl.opt_transfer_length = sector_lun2qemu(iscsilun->bl.opt_xfer_len,
|
|
iscsilun);
|
|
return 0;
|
|
}
|
|
|
|
/* Since iscsi_open() ignores bdrv_flags, there is nothing to do here in
|
|
* prepare. Note that this will not re-establish a connection with an iSCSI
|
|
* target - it is effectively a NOP. */
|
|
static int iscsi_reopen_prepare(BDRVReopenState *state,
|
|
BlockReopenQueue *queue, Error **errp)
|
|
{
|
|
/* NOP */
|
|
return 0;
|
|
}
|
|
|
|
static int iscsi_truncate(BlockDriverState *bs, int64_t offset)
|
|
{
|
|
IscsiLun *iscsilun = bs->opaque;
|
|
Error *local_err = NULL;
|
|
|
|
if (iscsilun->type != TYPE_DISK) {
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
iscsi_readcapacity_sync(iscsilun, &local_err);
|
|
if (local_err != NULL) {
|
|
error_free(local_err);
|
|
return -EIO;
|
|
}
|
|
|
|
if (offset > iscsi_getlength(bs)) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int iscsi_create(const char *filename, QEMUOptionParameter *options,
|
|
Error **errp)
|
|
{
|
|
int ret = 0;
|
|
int64_t total_size = 0;
|
|
BlockDriverState *bs;
|
|
IscsiLun *iscsilun = NULL;
|
|
QDict *bs_options;
|
|
|
|
bs = bdrv_new("");
|
|
|
|
/* Read out options */
|
|
while (options && options->name) {
|
|
if (!strcmp(options->name, "size")) {
|
|
total_size = options->value.n / BDRV_SECTOR_SIZE;
|
|
}
|
|
options++;
|
|
}
|
|
|
|
bs->opaque = g_malloc0(sizeof(struct IscsiLun));
|
|
iscsilun = bs->opaque;
|
|
|
|
bs_options = qdict_new();
|
|
qdict_put(bs_options, "filename", qstring_from_str(filename));
|
|
ret = iscsi_open(bs, bs_options, 0, NULL);
|
|
QDECREF(bs_options);
|
|
|
|
if (ret != 0) {
|
|
goto out;
|
|
}
|
|
if (iscsilun->nop_timer) {
|
|
timer_del(iscsilun->nop_timer);
|
|
timer_free(iscsilun->nop_timer);
|
|
}
|
|
if (iscsilun->type != TYPE_DISK) {
|
|
ret = -ENODEV;
|
|
goto out;
|
|
}
|
|
if (bs->total_sectors < total_size) {
|
|
ret = -ENOSPC;
|
|
goto out;
|
|
}
|
|
|
|
ret = 0;
|
|
out:
|
|
if (iscsilun->iscsi != NULL) {
|
|
iscsi_destroy_context(iscsilun->iscsi);
|
|
}
|
|
g_free(bs->opaque);
|
|
bs->opaque = NULL;
|
|
bdrv_unref(bs);
|
|
return ret;
|
|
}
|
|
|
|
static int iscsi_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
|
|
{
|
|
IscsiLun *iscsilun = bs->opaque;
|
|
bdi->unallocated_blocks_are_zero = !!iscsilun->lbprz;
|
|
bdi->can_write_zeroes_with_unmap = iscsilun->lbprz && iscsilun->lbp.lbpws;
|
|
/* Guess the internal cluster (page) size of the iscsi target by the means
|
|
* of opt_unmap_gran. Transfer the unmap granularity only if it has a
|
|
* reasonable size for bdi->cluster_size */
|
|
if (iscsilun->bl.opt_unmap_gran * iscsilun->block_size >= 64 * 1024 &&
|
|
iscsilun->bl.opt_unmap_gran * iscsilun->block_size <= 16 * 1024 * 1024) {
|
|
bdi->cluster_size = iscsilun->bl.opt_unmap_gran * iscsilun->block_size;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static QEMUOptionParameter iscsi_create_options[] = {
|
|
{
|
|
.name = BLOCK_OPT_SIZE,
|
|
.type = OPT_SIZE,
|
|
.help = "Virtual disk size"
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
static BlockDriver bdrv_iscsi = {
|
|
.format_name = "iscsi",
|
|
.protocol_name = "iscsi",
|
|
|
|
.instance_size = sizeof(IscsiLun),
|
|
.bdrv_needs_filename = true,
|
|
.bdrv_file_open = iscsi_open,
|
|
.bdrv_close = iscsi_close,
|
|
.bdrv_create = iscsi_create,
|
|
.create_options = iscsi_create_options,
|
|
.bdrv_reopen_prepare = iscsi_reopen_prepare,
|
|
|
|
.bdrv_getlength = iscsi_getlength,
|
|
.bdrv_get_info = iscsi_get_info,
|
|
.bdrv_truncate = iscsi_truncate,
|
|
.bdrv_refresh_limits = iscsi_refresh_limits,
|
|
|
|
#if defined(LIBISCSI_FEATURE_IOVECTOR)
|
|
.bdrv_co_get_block_status = iscsi_co_get_block_status,
|
|
#endif
|
|
.bdrv_co_discard = iscsi_co_discard,
|
|
#if defined(SCSI_SENSE_ASCQ_CAPACITY_DATA_HAS_CHANGED)
|
|
.bdrv_co_write_zeroes = iscsi_co_write_zeroes,
|
|
#endif
|
|
.bdrv_co_readv = iscsi_co_readv,
|
|
.bdrv_co_writev = iscsi_co_writev,
|
|
.bdrv_co_flush_to_disk = iscsi_co_flush,
|
|
|
|
#ifdef __linux__
|
|
.bdrv_ioctl = iscsi_ioctl,
|
|
.bdrv_aio_ioctl = iscsi_aio_ioctl,
|
|
#endif
|
|
};
|
|
|
|
static QemuOptsList qemu_iscsi_opts = {
|
|
.name = "iscsi",
|
|
.head = QTAILQ_HEAD_INITIALIZER(qemu_iscsi_opts.head),
|
|
.desc = {
|
|
{
|
|
.name = "user",
|
|
.type = QEMU_OPT_STRING,
|
|
.help = "username for CHAP authentication to target",
|
|
},{
|
|
.name = "password",
|
|
.type = QEMU_OPT_STRING,
|
|
.help = "password for CHAP authentication to target",
|
|
},{
|
|
.name = "header-digest",
|
|
.type = QEMU_OPT_STRING,
|
|
.help = "HeaderDigest setting. "
|
|
"{CRC32C|CRC32C-NONE|NONE-CRC32C|NONE}",
|
|
},{
|
|
.name = "initiator-name",
|
|
.type = QEMU_OPT_STRING,
|
|
.help = "Initiator iqn name to use when connecting",
|
|
},
|
|
{ /* end of list */ }
|
|
},
|
|
};
|
|
|
|
static void iscsi_block_init(void)
|
|
{
|
|
bdrv_register(&bdrv_iscsi);
|
|
qemu_add_opts(&qemu_iscsi_opts);
|
|
}
|
|
|
|
block_init(iscsi_block_init);
|