/* * QEMU Block driver for iSCSI images * * Copyright (c) 2010-2011 Ronnie Sahlberg <ronniesahlberg@gmail.com> * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ #include "config-host.h" #include <poll.h> #include <arpa/inet.h> #include "qemu-common.h" #include "qemu/config-file.h" #include "qemu/error-report.h" #include "block/block_int.h" #include "trace.h" #include "block/scsi.h" #include "qemu/iov.h" #include <iscsi/iscsi.h> #include <iscsi/scsi-lowlevel.h> #ifdef __linux__ #include <scsi/sg.h> #include <block/scsi.h> #endif typedef struct IscsiLun { struct iscsi_context *iscsi; int lun; enum scsi_inquiry_peripheral_device_type type; int block_size; uint64_t num_blocks; int events; QEMUTimer *nop_timer; } IscsiLun; typedef struct IscsiAIOCB { BlockDriverAIOCB common; QEMUIOVector *qiov; QEMUBH *bh; IscsiLun *iscsilun; struct scsi_task *task; uint8_t *buf; int status; int canceled; int retries; int64_t sector_num; int nb_sectors; #ifdef __linux__ sg_io_hdr_t *ioh; #endif } IscsiAIOCB; #define NOP_INTERVAL 5000 #define MAX_NOP_FAILURES 3 #define ISCSI_CMD_RETRIES 5 static void iscsi_bh_cb(void *p) { IscsiAIOCB *acb = p; qemu_bh_delete(acb->bh); g_free(acb->buf); acb->buf = NULL; if (acb->canceled == 0) { acb->common.cb(acb->common.opaque, acb->status); } if (acb->task != NULL) { scsi_free_scsi_task(acb->task); acb->task = NULL; } qemu_aio_release(acb); } static void iscsi_schedule_bh(IscsiAIOCB *acb) { if (acb->bh) { return; } acb->bh = qemu_bh_new(iscsi_bh_cb, acb); qemu_bh_schedule(acb->bh); } static void iscsi_abort_task_cb(struct iscsi_context *iscsi, int status, void *command_data, void *private_data) { IscsiAIOCB *acb = private_data; acb->status = -ECANCELED; iscsi_schedule_bh(acb); } static void iscsi_aio_cancel(BlockDriverAIOCB *blockacb) { IscsiAIOCB *acb = (IscsiAIOCB *)blockacb; IscsiLun *iscsilun = acb->iscsilun; if (acb->status != -EINPROGRESS) { return; } acb->canceled = 1; /* send a task mgmt call to the target to cancel the task on the target */ iscsi_task_mgmt_abort_task_async(iscsilun->iscsi, acb->task, iscsi_abort_task_cb, acb); while (acb->status == -EINPROGRESS) { qemu_aio_wait(); } } static const AIOCBInfo iscsi_aiocb_info = { .aiocb_size = sizeof(IscsiAIOCB), .cancel = iscsi_aio_cancel, }; static void iscsi_process_read(void *arg); static void iscsi_process_write(void *arg); static void iscsi_set_events(IscsiLun *iscsilun) { struct iscsi_context *iscsi = iscsilun->iscsi; int ev; /* We always register a read handler. */ ev = POLLIN; ev |= iscsi_which_events(iscsi); if (ev != iscsilun->events) { qemu_aio_set_fd_handler(iscsi_get_fd(iscsi), iscsi_process_read, (ev & POLLOUT) ? iscsi_process_write : NULL, iscsilun); } iscsilun->events = ev; } static void iscsi_process_read(void *arg) { IscsiLun *iscsilun = arg; struct iscsi_context *iscsi = iscsilun->iscsi; iscsi_service(iscsi, POLLIN); iscsi_set_events(iscsilun); } static void iscsi_process_write(void *arg) { IscsiLun *iscsilun = arg; struct iscsi_context *iscsi = iscsilun->iscsi; iscsi_service(iscsi, POLLOUT); iscsi_set_events(iscsilun); } static int iscsi_aio_writev_acb(IscsiAIOCB *acb); static void iscsi_aio_write16_cb(struct iscsi_context *iscsi, int status, void *command_data, void *opaque) { IscsiAIOCB *acb = opaque; trace_iscsi_aio_write16_cb(iscsi, status, acb, acb->canceled); g_free(acb->buf); acb->buf = NULL; if (acb->canceled != 0) { return; } acb->status = 0; if (status != 0) { if (status == SCSI_STATUS_CHECK_CONDITION && acb->task->sense.key == SCSI_SENSE_UNIT_ATTENTION && acb->retries-- > 0) { scsi_free_scsi_task(acb->task); acb->task = NULL; if (iscsi_aio_writev_acb(acb) == 0) { iscsi_set_events(acb->iscsilun); return; } } error_report("Failed to write16 data to iSCSI lun. %s", iscsi_get_error(iscsi)); acb->status = -EIO; } iscsi_schedule_bh(acb); } static int64_t sector_lun2qemu(int64_t sector, IscsiLun *iscsilun) { return sector * iscsilun->block_size / BDRV_SECTOR_SIZE; } static int64_t sector_qemu2lun(int64_t sector, IscsiLun *iscsilun) { return sector * BDRV_SECTOR_SIZE / iscsilun->block_size; } static bool is_request_lun_aligned(int64_t sector_num, int nb_sectors, IscsiLun *iscsilun) { if ((sector_num * BDRV_SECTOR_SIZE) % iscsilun->block_size || (nb_sectors * BDRV_SECTOR_SIZE) % iscsilun->block_size) { error_report("iSCSI misaligned request: " "iscsilun->block_size %u, sector_num %" PRIi64 ", nb_sectors %d", iscsilun->block_size, sector_num, nb_sectors); return 0; } return 1; } static int iscsi_aio_writev_acb(IscsiAIOCB *acb) { struct iscsi_context *iscsi = acb->iscsilun->iscsi; size_t size; uint32_t num_sectors; uint64_t lba; #if !defined(LIBISCSI_FEATURE_IOVECTOR) struct iscsi_data data; #endif int ret; acb->canceled = 0; acb->bh = NULL; acb->status = -EINPROGRESS; acb->buf = NULL; /* this will allow us to get rid of 'buf' completely */ size = acb->nb_sectors * BDRV_SECTOR_SIZE; #if !defined(LIBISCSI_FEATURE_IOVECTOR) data.size = MIN(size, acb->qiov->size); /* if the iovec only contains one buffer we can pass it directly */ if (acb->qiov->niov == 1) { data.data = acb->qiov->iov[0].iov_base; } else { acb->buf = g_malloc(data.size); qemu_iovec_to_buf(acb->qiov, 0, acb->buf, data.size); data.data = acb->buf; } #endif acb->task = malloc(sizeof(struct scsi_task)); if (acb->task == NULL) { error_report("iSCSI: Failed to allocate task for scsi WRITE16 " "command. %s", iscsi_get_error(iscsi)); return -1; } memset(acb->task, 0, sizeof(struct scsi_task)); acb->task->xfer_dir = SCSI_XFER_WRITE; acb->task->cdb_size = 16; acb->task->cdb[0] = 0x8a; lba = sector_qemu2lun(acb->sector_num, acb->iscsilun); *(uint32_t *)&acb->task->cdb[2] = htonl(lba >> 32); *(uint32_t *)&acb->task->cdb[6] = htonl(lba & 0xffffffff); num_sectors = sector_qemu2lun(acb->nb_sectors, acb->iscsilun); *(uint32_t *)&acb->task->cdb[10] = htonl(num_sectors); acb->task->expxferlen = size; #if defined(LIBISCSI_FEATURE_IOVECTOR) ret = iscsi_scsi_command_async(iscsi, acb->iscsilun->lun, acb->task, iscsi_aio_write16_cb, NULL, acb); #else ret = iscsi_scsi_command_async(iscsi, acb->iscsilun->lun, acb->task, iscsi_aio_write16_cb, &data, acb); #endif if (ret != 0) { scsi_free_scsi_task(acb->task); g_free(acb->buf); return -1; } #if defined(LIBISCSI_FEATURE_IOVECTOR) scsi_task_set_iov_out(acb->task, (struct scsi_iovec*) acb->qiov->iov, acb->qiov->niov); #endif return 0; } static BlockDriverAIOCB * iscsi_aio_writev(BlockDriverState *bs, int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, BlockDriverCompletionFunc *cb, void *opaque) { IscsiLun *iscsilun = bs->opaque; IscsiAIOCB *acb; if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { return NULL; } acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque); trace_iscsi_aio_writev(iscsilun->iscsi, sector_num, nb_sectors, opaque, acb); acb->iscsilun = iscsilun; acb->qiov = qiov; acb->nb_sectors = nb_sectors; acb->sector_num = sector_num; acb->retries = ISCSI_CMD_RETRIES; if (iscsi_aio_writev_acb(acb) != 0) { qemu_aio_release(acb); return NULL; } iscsi_set_events(iscsilun); return &acb->common; } static int iscsi_aio_readv_acb(IscsiAIOCB *acb); static void iscsi_aio_read16_cb(struct iscsi_context *iscsi, int status, void *command_data, void *opaque) { IscsiAIOCB *acb = opaque; trace_iscsi_aio_read16_cb(iscsi, status, acb, acb->canceled); if (acb->canceled != 0) { return; } acb->status = 0; if (status != 0) { if (status == SCSI_STATUS_CHECK_CONDITION && acb->task->sense.key == SCSI_SENSE_UNIT_ATTENTION && acb->retries-- > 0) { scsi_free_scsi_task(acb->task); acb->task = NULL; if (iscsi_aio_readv_acb(acb) == 0) { iscsi_set_events(acb->iscsilun); return; } } error_report("Failed to read16 data from iSCSI lun. %s", iscsi_get_error(iscsi)); acb->status = -EIO; } iscsi_schedule_bh(acb); } static int iscsi_aio_readv_acb(IscsiAIOCB *acb) { struct iscsi_context *iscsi = acb->iscsilun->iscsi; size_t size; uint64_t lba; uint32_t num_sectors; int ret; #if !defined(LIBISCSI_FEATURE_IOVECTOR) int i; #endif acb->canceled = 0; acb->bh = NULL; acb->status = -EINPROGRESS; acb->buf = NULL; size = acb->nb_sectors * BDRV_SECTOR_SIZE; acb->task = malloc(sizeof(struct scsi_task)); if (acb->task == NULL) { error_report("iSCSI: Failed to allocate task for scsi READ16 " "command. %s", iscsi_get_error(iscsi)); return -1; } memset(acb->task, 0, sizeof(struct scsi_task)); acb->task->xfer_dir = SCSI_XFER_READ; acb->task->expxferlen = size; lba = sector_qemu2lun(acb->sector_num, acb->iscsilun); num_sectors = sector_qemu2lun(acb->nb_sectors, acb->iscsilun); switch (acb->iscsilun->type) { case TYPE_DISK: acb->task->cdb_size = 16; acb->task->cdb[0] = 0x88; *(uint32_t *)&acb->task->cdb[2] = htonl(lba >> 32); *(uint32_t *)&acb->task->cdb[6] = htonl(lba & 0xffffffff); *(uint32_t *)&acb->task->cdb[10] = htonl(num_sectors); break; default: acb->task->cdb_size = 10; acb->task->cdb[0] = 0x28; *(uint32_t *)&acb->task->cdb[2] = htonl(lba); *(uint16_t *)&acb->task->cdb[7] = htons(num_sectors); break; } ret = iscsi_scsi_command_async(iscsi, acb->iscsilun->lun, acb->task, iscsi_aio_read16_cb, NULL, acb); if (ret != 0) { scsi_free_scsi_task(acb->task); return -1; } #if defined(LIBISCSI_FEATURE_IOVECTOR) scsi_task_set_iov_in(acb->task, (struct scsi_iovec*) acb->qiov->iov, acb->qiov->niov); #else for (i = 0; i < acb->qiov->niov; i++) { scsi_task_add_data_in_buffer(acb->task, acb->qiov->iov[i].iov_len, acb->qiov->iov[i].iov_base); } #endif return 0; } static BlockDriverAIOCB * iscsi_aio_readv(BlockDriverState *bs, int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, BlockDriverCompletionFunc *cb, void *opaque) { IscsiLun *iscsilun = bs->opaque; IscsiAIOCB *acb; if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { return NULL; } acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque); trace_iscsi_aio_readv(iscsilun->iscsi, sector_num, nb_sectors, opaque, acb); acb->nb_sectors = nb_sectors; acb->sector_num = sector_num; acb->iscsilun = iscsilun; acb->qiov = qiov; acb->retries = ISCSI_CMD_RETRIES; if (iscsi_aio_readv_acb(acb) != 0) { qemu_aio_release(acb); return NULL; } iscsi_set_events(iscsilun); return &acb->common; } static int iscsi_aio_flush_acb(IscsiAIOCB *acb); static void iscsi_synccache10_cb(struct iscsi_context *iscsi, int status, void *command_data, void *opaque) { IscsiAIOCB *acb = opaque; if (acb->canceled != 0) { return; } acb->status = 0; if (status != 0) { if (status == SCSI_STATUS_CHECK_CONDITION && acb->task->sense.key == SCSI_SENSE_UNIT_ATTENTION && acb->retries-- > 0) { scsi_free_scsi_task(acb->task); acb->task = NULL; if (iscsi_aio_flush_acb(acb) == 0) { iscsi_set_events(acb->iscsilun); return; } } error_report("Failed to sync10 data on iSCSI lun. %s", iscsi_get_error(iscsi)); acb->status = -EIO; } iscsi_schedule_bh(acb); } static int iscsi_aio_flush_acb(IscsiAIOCB *acb) { struct iscsi_context *iscsi = acb->iscsilun->iscsi; acb->canceled = 0; acb->bh = NULL; acb->status = -EINPROGRESS; acb->buf = NULL; acb->task = iscsi_synchronizecache10_task(iscsi, acb->iscsilun->lun, 0, 0, 0, 0, iscsi_synccache10_cb, acb); if (acb->task == NULL) { error_report("iSCSI: Failed to send synchronizecache10 command. %s", iscsi_get_error(iscsi)); return -1; } return 0; } static BlockDriverAIOCB * iscsi_aio_flush(BlockDriverState *bs, BlockDriverCompletionFunc *cb, void *opaque) { IscsiLun *iscsilun = bs->opaque; IscsiAIOCB *acb; acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque); acb->iscsilun = iscsilun; acb->retries = ISCSI_CMD_RETRIES; if (iscsi_aio_flush_acb(acb) != 0) { qemu_aio_release(acb); return NULL; } iscsi_set_events(iscsilun); return &acb->common; } static int iscsi_aio_discard_acb(IscsiAIOCB *acb); static void iscsi_unmap_cb(struct iscsi_context *iscsi, int status, void *command_data, void *opaque) { IscsiAIOCB *acb = opaque; if (acb->canceled != 0) { return; } acb->status = 0; if (status != 0) { if (status == SCSI_STATUS_CHECK_CONDITION && acb->task->sense.key == SCSI_SENSE_UNIT_ATTENTION && acb->retries-- > 0) { scsi_free_scsi_task(acb->task); acb->task = NULL; if (iscsi_aio_discard_acb(acb) == 0) { iscsi_set_events(acb->iscsilun); return; } } error_report("Failed to unmap data on iSCSI lun. %s", iscsi_get_error(iscsi)); acb->status = -EIO; } iscsi_schedule_bh(acb); } static int iscsi_aio_discard_acb(IscsiAIOCB *acb) { struct iscsi_context *iscsi = acb->iscsilun->iscsi; struct unmap_list list[1]; acb->canceled = 0; acb->bh = NULL; acb->status = -EINPROGRESS; acb->buf = NULL; list[0].lba = sector_qemu2lun(acb->sector_num, acb->iscsilun); list[0].num = acb->nb_sectors * BDRV_SECTOR_SIZE / acb->iscsilun->block_size; acb->task = iscsi_unmap_task(iscsi, acb->iscsilun->lun, 0, 0, &list[0], 1, iscsi_unmap_cb, acb); if (acb->task == NULL) { error_report("iSCSI: Failed to send unmap command. %s", iscsi_get_error(iscsi)); return -1; } return 0; } static BlockDriverAIOCB * iscsi_aio_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors, BlockDriverCompletionFunc *cb, void *opaque) { IscsiLun *iscsilun = bs->opaque; IscsiAIOCB *acb; acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque); acb->iscsilun = iscsilun; acb->nb_sectors = nb_sectors; acb->sector_num = sector_num; acb->retries = ISCSI_CMD_RETRIES; if (iscsi_aio_discard_acb(acb) != 0) { qemu_aio_release(acb); return NULL; } iscsi_set_events(iscsilun); return &acb->common; } #ifdef __linux__ static void iscsi_aio_ioctl_cb(struct iscsi_context *iscsi, int status, void *command_data, void *opaque) { IscsiAIOCB *acb = opaque; 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; } static int parse_chap(struct iscsi_context *iscsi, const char *target) { QemuOptsList *list; QemuOpts *opts; const char *user = NULL; const char *password = NULL; list = qemu_find_opts("iscsi"); if (!list) { return 0; } opts = qemu_opts_find(list, target); if (opts == NULL) { opts = QTAILQ_FIRST(&list->head); if (!opts) { return 0; } } user = qemu_opt_get(opts, "user"); if (!user) { return 0; } password = qemu_opt_get(opts, "password"); if (!password) { error_report("CHAP username specified but no password was given"); return -1; } if (iscsi_set_initiator_username_pwd(iscsi, user, password)) { error_report("Failed to set initiator username and password"); return -1; } return 0; } static void parse_header_digest(struct iscsi_context *iscsi, const char *target) { QemuOptsList *list; QemuOpts *opts; const char *digest = NULL; list = qemu_find_opts("iscsi"); if (!list) { return; } opts = qemu_opts_find(list, target); if (opts == NULL) { opts = QTAILQ_FIRST(&list->head); if (!opts) { return; } } digest = qemu_opt_get(opts, "header-digest"); if (!digest) { return; } if (!strcmp(digest, "CRC32C")) { iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C); } else if (!strcmp(digest, "NONE")) { iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE); } else if (!strcmp(digest, "CRC32C-NONE")) { iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C_NONE); } else if (!strcmp(digest, "NONE-CRC32C")) { iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); } else { error_report("Invalid header-digest setting : %s", digest); } } static char *parse_initiator_name(const char *target) { QemuOptsList *list; QemuOpts *opts; const char *name = NULL; const char *iscsi_name = qemu_get_vm_name(); list = qemu_find_opts("iscsi"); if (list) { opts = qemu_opts_find(list, target); if (!opts) { opts = QTAILQ_FIRST(&list->head); } if (opts) { name = qemu_opt_get(opts, "initiator-name"); } } if (name) { return g_strdup(name); } else { return g_strdup_printf("iqn.2008-11.org.linux-kvm%s%s", iscsi_name ? ":" : "", iscsi_name ? iscsi_name : ""); } } #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; } qemu_mod_timer(iscsilun->nop_timer, qemu_get_clock_ms(rt_clock) + NOP_INTERVAL); iscsi_set_events(iscsilun); } #endif static int iscsi_readcapacity_sync(IscsiLun *iscsilun) { struct scsi_task *task = NULL; struct scsi_readcapacity10 *rc10 = NULL; struct scsi_readcapacity16 *rc16 = NULL; int ret = 0; 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_report("iSCSI: Failed to unmarshall readcapacity16 data."); ret = -EINVAL; } else { iscsilun->block_size = rc16->block_length; iscsilun->num_blocks = rc16->returned_lba + 1; } } 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_report("iSCSI: Failed to unmarshall readcapacity10 data."); ret = -EINVAL; } 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 0; } } 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_report("iSCSI: failed to send readcapacity10 command."); ret = -EINVAL; } if (task) { scsi_free_scsi_task(task); } return ret; } /* 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 */ } }, }; /* * We support iscsi url's on the form * iscsi://[<username>%<password>@]<host>[:<port>]/<targetname>/<lun> */ static int iscsi_open(BlockDriverState *bs, QDict *options, int flags) { IscsiLun *iscsilun = bs->opaque; struct iscsi_context *iscsi = NULL; struct iscsi_url *iscsi_url = NULL; struct scsi_task *task = NULL; struct scsi_inquiry_standard *inq = NULL; char *initiator_name = NULL; QemuOpts *opts; Error *local_err = NULL; const char *filename; int ret; if ((BDRV_SECTOR_SIZE % 512) != 0) { error_report("iSCSI: Invalid BDRV_SECTOR_SIZE. " "BDRV_SECTOR_SIZE(%lld) is not a multiple " "of 512", BDRV_SECTOR_SIZE); return -EINVAL; } opts = qemu_opts_create_nofail(&runtime_opts); qemu_opts_absorb_qdict(opts, options, &local_err); if (error_is_set(&local_err)) { qerror_report_err(local_err); error_free(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_report("Failed to parse URL : %s", filename); ret = -EINVAL; goto out; } memset(iscsilun, 0, sizeof(IscsiLun)); initiator_name = parse_initiator_name(iscsi_url->target); iscsi = iscsi_create_context(initiator_name); if (iscsi == NULL) { error_report("iSCSI: Failed to create iSCSI context."); ret = -ENOMEM; goto out; } if (iscsi_set_targetname(iscsi, iscsi_url->target)) { error_report("iSCSI: Failed to set target name."); ret = -EINVAL; goto out; } if (iscsi_url->user != NULL) { ret = iscsi_set_initiator_username_pwd(iscsi, iscsi_url->user, iscsi_url->passwd); if (ret != 0) { error_report("Failed to set initiator username and password"); ret = -EINVAL; goto out; } } /* check if we got CHAP username/password via the options */ if (parse_chap(iscsi, iscsi_url->target) != 0) { error_report("iSCSI: Failed to set CHAP user/password"); ret = -EINVAL; goto out; } if (iscsi_set_session_type(iscsi, ISCSI_SESSION_NORMAL) != 0) { error_report("iSCSI: Failed to set session type to normal."); ret = -EINVAL; goto out; } iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); /* check if we got HEADER_DIGEST via the options */ parse_header_digest(iscsi, iscsi_url->target); if (iscsi_full_connect_sync(iscsi, iscsi_url->portal, iscsi_url->lun) != 0) { error_report("iSCSI: Failed to connect to LUN : %s", iscsi_get_error(iscsi)); ret = -EINVAL; goto out; } iscsilun->iscsi = iscsi; iscsilun->lun = iscsi_url->lun; task = iscsi_inquiry_sync(iscsi, iscsilun->lun, 0, 0, 36); if (task == NULL || task->status != SCSI_STATUS_GOOD) { error_report("iSCSI: failed to send inquiry command."); ret = -EINVAL; goto out; } inq = scsi_datain_unmarshall(task); if (inq == NULL) { error_report("iSCSI: Failed to unmarshall inquiry data."); ret = -EINVAL; goto out; } iscsilun->type = inq->periperal_device_type; if ((ret = iscsi_readcapacity_sync(iscsilun)) != 0) { goto out; } bs->total_sectors = sector_lun2qemu(iscsilun->num_blocks, iscsilun); /* Medium changer or tape. We dont have any emulation for this so this must * be sg ioctl compatible. We force it to be sg, otherwise qemu will try * to read from the device to guess the image format. */ if (iscsilun->type == TYPE_MEDIUM_CHANGER || iscsilun->type == TYPE_TAPE) { bs->sg = 1; } #if defined(LIBISCSI_FEATURE_NOP_COUNTER) /* Set up a timer for sending out iSCSI NOPs */ iscsilun->nop_timer = qemu_new_timer_ms(rt_clock, iscsi_nop_timed_event, iscsilun); qemu_mod_timer(iscsilun->nop_timer, qemu_get_clock_ms(rt_clock) + 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) { qemu_del_timer(iscsilun->nop_timer); qemu_free_timer(iscsilun->nop_timer); } qemu_aio_set_fd_handler(iscsi_get_fd(iscsi), NULL, NULL, NULL); iscsi_destroy_context(iscsi); memset(iscsilun, 0, sizeof(IscsiLun)); } static int iscsi_truncate(BlockDriverState *bs, int64_t offset) { IscsiLun *iscsilun = bs->opaque; int ret = 0; if (iscsilun->type != TYPE_DISK) { return -ENOTSUP; } if ((ret = iscsi_readcapacity_sync(iscsilun)) != 0) { return ret; } if (offset > iscsi_getlength(bs)) { return -EINVAL; } return 0; } static int iscsi_has_zero_init(BlockDriverState *bs) { return 0; } static int iscsi_create(const char *filename, QEMUOptionParameter *options) { int ret = 0; int64_t total_size = 0; BlockDriverState bs; IscsiLun *iscsilun = NULL; QDict *bs_options; memset(&bs, 0, sizeof(BlockDriverState)); /* 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); QDECREF(bs_options); if (ret != 0) { goto out; } if (iscsilun->nop_timer) { qemu_del_timer(iscsilun->nop_timer); qemu_free_timer(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); return ret; } 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_file_open = iscsi_open, .bdrv_close = iscsi_close, .bdrv_create = iscsi_create, .create_options = iscsi_create_options, .bdrv_getlength = iscsi_getlength, .bdrv_truncate = iscsi_truncate, .bdrv_aio_readv = iscsi_aio_readv, .bdrv_aio_writev = iscsi_aio_writev, .bdrv_aio_flush = iscsi_aio_flush, .bdrv_aio_discard = iscsi_aio_discard, .bdrv_has_zero_init = iscsi_has_zero_init, #ifdef __linux__ .bdrv_ioctl = iscsi_ioctl, .bdrv_aio_ioctl = iscsi_aio_ioctl, #endif }; static 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);