diff options
Diffstat (limited to 'qemu/block/iscsi.c')
| -rw-r--r-- | qemu/block/iscsi.c | 1904 |
1 files changed, 0 insertions, 1904 deletions
diff --git a/qemu/block/iscsi.c b/qemu/block/iscsi.c deleted file mode 100644 index 302baf84c..000000000 --- a/qemu/block/iscsi.c +++ /dev/null @@ -1,1904 +0,0 @@ -/* - * QEMU Block driver for iSCSI images - * - * Copyright (c) 2010-2011 Ronnie Sahlberg <ronniesahlberg@gmail.com> - * Copyright (c) 2012-2015 Peter Lieven <pl@kamp.de> - * - * 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 "qemu/osdep.h" - -#include <poll.h> -#include <math.h> -#include <arpa/inet.h> -#include "qemu-common.h" -#include "qemu/config-file.h" -#include "qemu/error-report.h" -#include "qemu/bitops.h" -#include "qemu/bitmap.h" -#include "block/block_int.h" -#include "block/scsi.h" -#include "qemu/iov.h" -#include "sysemu/sysemu.h" -#include "qmp-commands.h" -#include "qapi/qmp/qstring.h" -#include "crypto/secret.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; - AioContext *aio_context; - int lun; - enum scsi_inquiry_peripheral_device_type type; - int block_size; - uint64_t num_blocks; - int events; - QEMUTimer *nop_timer; - QEMUTimer *event_timer; - struct scsi_inquiry_logical_block_provisioning lbp; - struct scsi_inquiry_block_limits bl; - unsigned char *zeroblock; - unsigned long *allocationmap; - int cluster_sectors; - bool use_16_for_rw; - bool write_protected; - bool lbpme; - bool lbprz; - bool dpofua; - bool has_write_same; - bool request_timed_out; -} IscsiLun; - -typedef struct IscsiTask { - int status; - int complete; - int retries; - int do_retry; - struct scsi_task *task; - Coroutine *co; - QEMUBH *bh; - IscsiLun *iscsilun; - QEMUTimer retry_timer; - int err_code; -} IscsiTask; - -typedef struct IscsiAIOCB { - BlockAIOCB common; - QEMUIOVector *qiov; - QEMUBH *bh; - IscsiLun *iscsilun; - struct scsi_task *task; - uint8_t *buf; - int status; - int64_t sector_num; - int nb_sectors; - int ret; -#ifdef __linux__ - sg_io_hdr_t *ioh; -#endif -} IscsiAIOCB; - -/* libiscsi uses time_t so its enough to process events every second */ -#define EVENT_INTERVAL 1000 -#define NOP_INTERVAL 5000 -#define MAX_NOP_FAILURES 3 -#define ISCSI_CMD_RETRIES ARRAY_SIZE(iscsi_retry_times) -static const unsigned iscsi_retry_times[] = {8, 32, 128, 512, 2048, 8192, 32768}; - -/* this threshold is a trade-off knob to choose between - * the potential additional overhead of an extra GET_LBA_STATUS request - * vs. unnecessarily reading a lot of zero sectors over the wire. - * If a read request is greater or equal than ISCSI_CHECKALLOC_THRES - * sectors we check the allocation status of the area covered by the - * request first if the allocationmap indicates that the area might be - * unallocated. */ -#define ISCSI_CHECKALLOC_THRES 64 - -static void -iscsi_bh_cb(void *p) -{ - IscsiAIOCB *acb = p; - - qemu_bh_delete(acb->bh); - - g_free(acb->buf); - acb->buf = NULL; - - acb->common.cb(acb->common.opaque, acb->status); - - if (acb->task != NULL) { - scsi_free_scsi_task(acb->task); - acb->task = NULL; - } - - qemu_aio_unref(acb); -} - -static void -iscsi_schedule_bh(IscsiAIOCB *acb) -{ - if (acb->bh) { - return; - } - acb->bh = aio_bh_new(acb->iscsilun->aio_context, iscsi_bh_cb, acb); - qemu_bh_schedule(acb->bh); -} - -static void iscsi_co_generic_bh_cb(void *opaque) -{ - struct IscsiTask *iTask = opaque; - iTask->complete = 1; - qemu_bh_delete(iTask->bh); - qemu_coroutine_enter(iTask->co, NULL); -} - -static void iscsi_retry_timer_expired(void *opaque) -{ - struct IscsiTask *iTask = opaque; - iTask->complete = 1; - if (iTask->co) { - qemu_coroutine_enter(iTask->co, NULL); - } -} - -static inline unsigned exp_random(double mean) -{ - return -mean * log((double)rand() / RAND_MAX); -} - -/* SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST was introduced in - * libiscsi 1.10.0, together with other constants we need. Use it as - * a hint that we have to define them ourselves if needed, to keep the - * minimum required libiscsi version at 1.9.0. We use an ASCQ macro for - * the test because SCSI_STATUS_* is an enum. - * - * To guard against future changes where SCSI_SENSE_ASCQ_* also becomes - * an enum, check against the LIBISCSI_API_VERSION macro, which was - * introduced in 1.11.0. If it is present, there is no need to define - * anything. - */ -#if !defined(SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST) && \ - !defined(LIBISCSI_API_VERSION) -#define SCSI_STATUS_TASK_SET_FULL 0x28 -#define SCSI_STATUS_TIMEOUT 0x0f000002 -#define SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST 0x2600 -#define SCSI_SENSE_ASCQ_PARAMETER_LIST_LENGTH_ERROR 0x1a00 -#endif - -static int iscsi_translate_sense(struct scsi_sense *sense) -{ - int ret; - - switch (sense->key) { - case SCSI_SENSE_NOT_READY: - return -EBUSY; - case SCSI_SENSE_DATA_PROTECTION: - return -EACCES; - case SCSI_SENSE_COMMAND_ABORTED: - return -ECANCELED; - case SCSI_SENSE_ILLEGAL_REQUEST: - /* Parse ASCQ */ - break; - default: - return -EIO; - } - switch (sense->ascq) { - case SCSI_SENSE_ASCQ_PARAMETER_LIST_LENGTH_ERROR: - case SCSI_SENSE_ASCQ_INVALID_OPERATION_CODE: - case SCSI_SENSE_ASCQ_INVALID_FIELD_IN_CDB: - case SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST: - ret = -EINVAL; - break; - case SCSI_SENSE_ASCQ_LBA_OUT_OF_RANGE: - ret = -ENOSPC; - break; - case SCSI_SENSE_ASCQ_LOGICAL_UNIT_NOT_SUPPORTED: - ret = -ENOTSUP; - break; - case SCSI_SENSE_ASCQ_MEDIUM_NOT_PRESENT: - case SCSI_SENSE_ASCQ_MEDIUM_NOT_PRESENT_TRAY_CLOSED: - case SCSI_SENSE_ASCQ_MEDIUM_NOT_PRESENT_TRAY_OPEN: - ret = -ENOMEDIUM; - break; - case SCSI_SENSE_ASCQ_WRITE_PROTECTED: - ret = -EACCES; - break; - default: - ret = -EIO; - break; - } - return ret; -} - -static void -iscsi_co_generic_cb(struct iscsi_context *iscsi, int status, - void *command_data, void *opaque) -{ - struct IscsiTask *iTask = opaque; - struct scsi_task *task = command_data; - - iTask->status = status; - iTask->do_retry = 0; - iTask->task = task; - - if (status != SCSI_STATUS_GOOD) { - if (iTask->retries++ < ISCSI_CMD_RETRIES) { - if (status == SCSI_STATUS_CHECK_CONDITION - && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) { - error_report("iSCSI CheckCondition: %s", - iscsi_get_error(iscsi)); - iTask->do_retry = 1; - goto out; - } - if (status == SCSI_STATUS_BUSY || - status == SCSI_STATUS_TIMEOUT || - status == SCSI_STATUS_TASK_SET_FULL) { - unsigned retry_time = - exp_random(iscsi_retry_times[iTask->retries - 1]); - if (status == SCSI_STATUS_TIMEOUT) { - /* make sure the request is rescheduled AFTER the - * reconnect is initiated */ - retry_time = EVENT_INTERVAL * 2; - iTask->iscsilun->request_timed_out = true; - } - error_report("iSCSI Busy/TaskSetFull/TimeOut" - " (retry #%u in %u ms): %s", - iTask->retries, retry_time, - iscsi_get_error(iscsi)); - aio_timer_init(iTask->iscsilun->aio_context, - &iTask->retry_timer, QEMU_CLOCK_REALTIME, - SCALE_MS, iscsi_retry_timer_expired, iTask); - timer_mod(&iTask->retry_timer, - qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + retry_time); - iTask->do_retry = 1; - return; - } - } - iTask->err_code = iscsi_translate_sense(&task->sense); - error_report("iSCSI Failure: %s", iscsi_get_error(iscsi)); - } - -out: - if (iTask->co) { - iTask->bh = aio_bh_new(iTask->iscsilun->aio_context, - iscsi_co_generic_bh_cb, iTask); - qemu_bh_schedule(iTask->bh); - } else { - iTask->complete = 1; - } -} - -static void iscsi_co_init_iscsitask(IscsiLun *iscsilun, struct IscsiTask *iTask) -{ - *iTask = (struct IscsiTask) { - .co = qemu_coroutine_self(), - .iscsilun = iscsilun, - }; -} - -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(BlockAIOCB *blockacb) -{ - IscsiAIOCB *acb = (IscsiAIOCB *)blockacb; - IscsiLun *iscsilun = acb->iscsilun; - - if (acb->status != -EINPROGRESS) { - return; - } - - /* 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); - -} - -static const AIOCBInfo iscsi_aiocb_info = { - .aiocb_size = sizeof(IscsiAIOCB), - .cancel_async = 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 = iscsi_which_events(iscsi); - - if (ev != iscsilun->events) { - aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsi), - false, - (ev & POLLIN) ? iscsi_process_read : NULL, - (ev & POLLOUT) ? iscsi_process_write : NULL, - iscsilun); - iscsilun->events = ev; - } -} - -static void iscsi_timed_check_events(void *opaque) -{ - IscsiLun *iscsilun = opaque; - - /* check for timed out requests */ - iscsi_service(iscsilun->iscsi, 0); - - if (iscsilun->request_timed_out) { - iscsilun->request_timed_out = false; - iscsi_reconnect(iscsilun->iscsi); - } - - /* newer versions of libiscsi may return zero events. Ensure we are able - * to return to service once this situation changes. */ - iscsi_set_events(iscsilun); - - timer_mod(iscsilun->event_timer, - qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL); -} - -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 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 unsigned long *iscsi_allocationmap_init(IscsiLun *iscsilun) -{ - return bitmap_try_new(DIV_ROUND_UP(sector_lun2qemu(iscsilun->num_blocks, - iscsilun), - iscsilun->cluster_sectors)); -} - -static void iscsi_allocationmap_set(IscsiLun *iscsilun, int64_t sector_num, - int nb_sectors) -{ - if (iscsilun->allocationmap == NULL) { - return; - } - bitmap_set(iscsilun->allocationmap, - sector_num / iscsilun->cluster_sectors, - DIV_ROUND_UP(nb_sectors, iscsilun->cluster_sectors)); -} - -static void iscsi_allocationmap_clear(IscsiLun *iscsilun, int64_t sector_num, - int nb_sectors) -{ - int64_t cluster_num, nb_clusters; - if (iscsilun->allocationmap == NULL) { - return; - } - cluster_num = DIV_ROUND_UP(sector_num, iscsilun->cluster_sectors); - nb_clusters = (sector_num + nb_sectors) / iscsilun->cluster_sectors - - cluster_num; - if (nb_clusters > 0) { - bitmap_clear(iscsilun->allocationmap, cluster_num, nb_clusters); - } -} - -static int coroutine_fn -iscsi_co_writev_flags(BlockDriverState *bs, int64_t sector_num, int nb_sectors, - QEMUIOVector *iov, int flags) -{ - IscsiLun *iscsilun = bs->opaque; - struct IscsiTask iTask; - uint64_t lba; - uint32_t num_sectors; - bool fua; - - if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { - return -EINVAL; - } - - if (bs->bl.max_transfer_length && nb_sectors > bs->bl.max_transfer_length) { - error_report("iSCSI Error: Write of %d sectors exceeds max_xfer_len " - "of %d sectors", nb_sectors, bs->bl.max_transfer_length); - return -EINVAL; - } - - lba = sector_qemu2lun(sector_num, iscsilun); - num_sectors = sector_qemu2lun(nb_sectors, iscsilun); - iscsi_co_init_iscsitask(iscsilun, &iTask); -retry: - fua = iscsilun->dpofua && (flags & BDRV_REQ_FUA); - if (iscsilun->use_16_for_rw) { - iTask.task = iscsi_write16_task(iscsilun->iscsi, iscsilun->lun, lba, - NULL, num_sectors * iscsilun->block_size, - iscsilun->block_size, 0, 0, fua, 0, 0, - iscsi_co_generic_cb, &iTask); - } else { - iTask.task = iscsi_write10_task(iscsilun->iscsi, iscsilun->lun, lba, - NULL, num_sectors * iscsilun->block_size, - iscsilun->block_size, 0, 0, fua, 0, 0, - iscsi_co_generic_cb, &iTask); - } - if (iTask.task == NULL) { - return -ENOMEM; - } - scsi_task_set_iov_out(iTask.task, (struct scsi_iovec *) iov->iov, - iov->niov); - 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_GOOD) { - return iTask.err_code; - } - - iscsi_allocationmap_set(iscsilun, sector_num, nb_sectors); - - return 0; -} - -static int coroutine_fn -iscsi_co_writev(BlockDriverState *bs, int64_t sector_num, int nb_sectors, - QEMUIOVector *iov) -{ - return iscsi_co_writev_flags(bs, sector_num, nb_sectors, iov, 0); -} - - -static bool iscsi_allocationmap_is_allocated(IscsiLun *iscsilun, - int64_t sector_num, int nb_sectors) -{ - unsigned long size; - if (iscsilun->allocationmap == NULL) { - return true; - } - size = DIV_ROUND_UP(sector_num + nb_sectors, iscsilun->cluster_sectors); - return !(find_next_bit(iscsilun->allocationmap, size, - sector_num / iscsilun->cluster_sectors) == size); -} - -static int64_t coroutine_fn iscsi_co_get_block_status(BlockDriverState *bs, - int64_t sector_num, - int nb_sectors, int *pnum, - BlockDriverState **file) -{ - 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) { - 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 (lbasd->provisioning == SCSI_PROVISIONING_TYPE_DEALLOCATED || - lbasd->provisioning == SCSI_PROVISIONING_TYPE_ANCHORED) { - ret &= ~BDRV_BLOCK_DATA; - if (iscsilun->lbprz) { - ret |= BDRV_BLOCK_ZERO; - } - } - - if (ret & BDRV_BLOCK_ZERO) { - iscsi_allocationmap_clear(iscsilun, sector_num, *pnum); - } else { - iscsi_allocationmap_set(iscsilun, sector_num, *pnum); - } - - if (*pnum > nb_sectors) { - *pnum = nb_sectors; - } -out: - if (iTask.task != NULL) { - scsi_free_scsi_task(iTask.task); - } - if (ret > 0 && ret & BDRV_BLOCK_OFFSET_VALID) { - *file = bs; - } - return ret; -} - -static int coroutine_fn iscsi_co_readv(BlockDriverState *bs, - int64_t sector_num, int nb_sectors, - QEMUIOVector *iov) -{ - IscsiLun *iscsilun = bs->opaque; - struct IscsiTask iTask; - uint64_t lba; - uint32_t num_sectors; - - if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { - return -EINVAL; - } - - if (bs->bl.max_transfer_length && nb_sectors > bs->bl.max_transfer_length) { - error_report("iSCSI Error: Read of %d sectors exceeds max_xfer_len " - "of %d sectors", nb_sectors, bs->bl.max_transfer_length); - return -EINVAL; - } - - if (iscsilun->lbprz && nb_sectors >= ISCSI_CHECKALLOC_THRES && - !iscsi_allocationmap_is_allocated(iscsilun, sector_num, nb_sectors)) { - int64_t ret; - int pnum; - BlockDriverState *file; - ret = iscsi_co_get_block_status(bs, sector_num, INT_MAX, &pnum, &file); - if (ret < 0) { - return ret; - } - if (ret & BDRV_BLOCK_ZERO && pnum >= nb_sectors) { - qemu_iovec_memset(iov, 0, 0x00, iov->size); - return 0; - } - } - - lba = sector_qemu2lun(sector_num, iscsilun); - num_sectors = sector_qemu2lun(nb_sectors, iscsilun); - - iscsi_co_init_iscsitask(iscsilun, &iTask); -retry: - if (iscsilun->use_16_for_rw) { - iTask.task = iscsi_read16_task(iscsilun->iscsi, iscsilun->lun, lba, - num_sectors * iscsilun->block_size, - iscsilun->block_size, 0, 0, 0, 0, 0, - iscsi_co_generic_cb, &iTask); - } else { - iTask.task = iscsi_read10_task(iscsilun->iscsi, iscsilun->lun, lba, - num_sectors * iscsilun->block_size, - iscsilun->block_size, - 0, 0, 0, 0, 0, - iscsi_co_generic_cb, &iTask); - } - if (iTask.task == NULL) { - return -ENOMEM; - } - scsi_task_set_iov_in(iTask.task, (struct scsi_iovec *) iov->iov, iov->niov); - - 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_GOOD) { - return iTask.err_code; - } - - return 0; -} - -static int coroutine_fn iscsi_co_flush(BlockDriverState *bs) -{ - IscsiLun *iscsilun = bs->opaque; - struct IscsiTask iTask; - - iscsi_co_init_iscsitask(iscsilun, &iTask); -retry: - if (iscsi_synchronizecache10_task(iscsilun->iscsi, iscsilun->lun, 0, 0, 0, - 0, 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_GOOD) { - return iTask.err_code; - } - - return 0; -} - -#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; - - acb->status = 0; - if (status < 0) { - error_report("Failed to ioctl(SG_IO) to iSCSI lun. %s", - iscsi_get_error(iscsi)); - acb->status = iscsi_translate_sense(&acb->task->sense); - } - - 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 void iscsi_ioctl_bh_completion(void *opaque) -{ - IscsiAIOCB *acb = opaque; - - qemu_bh_delete(acb->bh); - acb->common.cb(acb->common.opaque, acb->ret); - qemu_aio_unref(acb); -} - -static void iscsi_ioctl_handle_emulated(IscsiAIOCB *acb, int req, void *buf) -{ - BlockDriverState *bs = acb->common.bs; - IscsiLun *iscsilun = bs->opaque; - int ret = 0; - - 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; - default: - ret = -EINVAL; - } - assert(!acb->bh); - acb->bh = aio_bh_new(bdrv_get_aio_context(bs), - iscsi_ioctl_bh_completion, acb); - acb->ret = ret; - qemu_bh_schedule(acb->bh); -} - -static BlockAIOCB *iscsi_aio_ioctl(BlockDriverState *bs, - unsigned long int req, void *buf, - BlockCompletionFunc *cb, void *opaque) -{ - IscsiLun *iscsilun = bs->opaque; - struct iscsi_context *iscsi = iscsilun->iscsi; - struct iscsi_data data; - IscsiAIOCB *acb; - - acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque); - - acb->iscsilun = iscsilun; - acb->bh = NULL; - acb->status = -EINPROGRESS; - acb->buf = NULL; - acb->ioh = buf; - - if (req != SG_IO) { - iscsi_ioctl_handle_emulated(acb, req, buf); - return &acb->common; - } - - 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_unref(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 { - scsi_task_set_iov_out(acb->task, - (struct scsi_iovec *) acb->ioh->dxferp, - acb->ioh->iovec_count); - } - } - - 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_unref(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 { - scsi_task_set_iov_in(acb->task, - (struct scsi_iovec *) acb->ioh->dxferp, - acb->ioh->iovec_count); - } - } - - iscsi_set_events(iscsilun); - - return &acb->common; -} - -#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 -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 iTask.err_code; - } - - iscsi_allocationmap_clear(iscsilun, sector_num, nb_sectors); - - return 0; -} - -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; - bool use_16_for_ws = iscsilun->use_16_for_rw; - - if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { - return -EINVAL; - } - - if (flags & BDRV_REQ_MAY_UNMAP) { - if (!use_16_for_ws && !iscsilun->lbp.lbpws10) { - /* WRITESAME10 with UNMAP is unsupported try WRITESAME16 */ - use_16_for_ws = true; - } - if (use_16_for_ws && !iscsilun->lbp.lbpws) { - /* WRITESAME16 with UNMAP is not supported by the target, - * fall back and try WRITESAME10/16 without UNMAP */ - flags &= ~BDRV_REQ_MAY_UNMAP; - use_16_for_ws = iscsilun->use_16_for_rw; - } - } - - if (!(flags & BDRV_REQ_MAY_UNMAP) && !iscsilun->has_write_same) { - /* WRITESAME without 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_try_malloc0(iscsilun->block_size); - if (iscsilun->zeroblock == NULL) { - return -ENOMEM; - } - } - - iscsi_co_init_iscsitask(iscsilun, &iTask); -retry: - if (use_16_for_ws) { - iTask.task = 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); - } else { - iTask.task = iscsi_writesame10_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); - } - if (iTask.task == 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 iTask.err_code; - } - - if (flags & BDRV_REQ_MAY_UNMAP) { - iscsi_allocationmap_clear(iscsilun, sector_num, nb_sectors); - } else { - iscsi_allocationmap_set(iscsilun, sector_num, nb_sectors); - } - - return 0; -} - -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; - const char *secretid; - char *secret = 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; - } - - secretid = qemu_opt_get(opts, "password-secret"); - password = qemu_opt_get(opts, "password"); - if (secretid && password) { - error_setg(errp, "'password' and 'password-secret' properties are " - "mutually exclusive"); - return; - } - if (secretid) { - secret = qcrypto_secret_lookup_as_utf8(secretid, errp); - if (!secret) { - return; - } - password = secret; - } else 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"); - } - - g_free(secret); -} - -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; -} - -static int parse_timeout(const char *target) -{ - QemuOptsList *list; - QemuOpts *opts; - const char *timeout; - - list = qemu_find_opts("iscsi"); - if (list) { - opts = qemu_opts_find(list, target); - if (!opts) { - opts = QTAILQ_FIRST(&list->head); - } - if (opts) { - timeout = qemu_opt_get(opts, "timeout"); - if (timeout) { - return atoi(timeout); - } - } - } - - return 0; -} - -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..."); - iscsilun->request_timed_out = true; - } else 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); -} - -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; - iscsilun->use_16_for_rw = (rc16->returned_lba > 0xffffffff); - } - break; - } - if (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION - && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) { - break; - } - /* Fall through and try READ CAPACITY(10) instead. */ - 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 readcapacity10/16 command"); - } else if (!iscsilun->block_size || - iscsilun->block_size % BDRV_SECTOR_SIZE) { - error_setg(errp, "iSCSI: the target returned an invalid " - "block size of %d.", iscsilun->block_size); - } - 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_with_err; - } - - return task; - -fail: - error_setg(errp, "iSCSI: Inquiry command failed : %s", - iscsi_get_error(iscsi)); -fail_with_err: - if (task != NULL) { - scsi_free_scsi_task(task); - } - return NULL; -} - -static void iscsi_detach_aio_context(BlockDriverState *bs) -{ - IscsiLun *iscsilun = bs->opaque; - - aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsilun->iscsi), - false, NULL, NULL, NULL); - iscsilun->events = 0; - - if (iscsilun->nop_timer) { - timer_del(iscsilun->nop_timer); - timer_free(iscsilun->nop_timer); - iscsilun->nop_timer = NULL; - } - if (iscsilun->event_timer) { - timer_del(iscsilun->event_timer); - timer_free(iscsilun->event_timer); - iscsilun->event_timer = NULL; - } -} - -static void iscsi_attach_aio_context(BlockDriverState *bs, - AioContext *new_context) -{ - IscsiLun *iscsilun = bs->opaque; - - iscsilun->aio_context = new_context; - iscsi_set_events(iscsilun); - - /* Set up a timer for sending out iSCSI NOPs */ - iscsilun->nop_timer = aio_timer_new(iscsilun->aio_context, - QEMU_CLOCK_REALTIME, SCALE_MS, - iscsi_nop_timed_event, iscsilun); - timer_mod(iscsilun->nop_timer, - qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); - - /* Set up a timer for periodic calls to iscsi_set_events and to - * scan for command timeout */ - iscsilun->event_timer = aio_timer_new(iscsilun->aio_context, - QEMU_CLOCK_REALTIME, SCALE_MS, - iscsi_timed_check_events, iscsilun); - timer_mod(iscsilun->event_timer, - qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL); -} - -static void iscsi_modesense_sync(IscsiLun *iscsilun) -{ - struct scsi_task *task; - struct scsi_mode_sense *ms = NULL; - iscsilun->write_protected = false; - iscsilun->dpofua = false; - - task = iscsi_modesense6_sync(iscsilun->iscsi, iscsilun->lun, - 1, SCSI_MODESENSE_PC_CURRENT, - 0x3F, 0, 255); - if (task == NULL) { - error_report("iSCSI: Failed to send MODE_SENSE(6) command: %s", - iscsi_get_error(iscsilun->iscsi)); - goto out; - } - - if (task->status != SCSI_STATUS_GOOD) { - error_report("iSCSI: Failed MODE_SENSE(6), LUN assumed writable"); - goto out; - } - ms = scsi_datain_unmarshall(task); - if (!ms) { - error_report("iSCSI: Failed to unmarshall MODE_SENSE(6) data: %s", - iscsi_get_error(iscsilun->iscsi)); - goto out; - } - iscsilun->write_protected = ms->device_specific_parameter & 0x80; - iscsilun->dpofua = ms->device_specific_parameter & 0x10; - -out: - if (task) { - scsi_free_scsi_task(task); - } -} - -/* - * 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, - 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 = 0, timeout = 0; - - 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[0] != '\0') { - 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; - } - - /* timeout handling is broken in libiscsi before 1.15.0 */ - timeout = parse_timeout(iscsi_url->target); -#if defined(LIBISCSI_API_VERSION) && LIBISCSI_API_VERSION >= 20150621 - iscsi_set_timeout(iscsi, timeout); -#else - if (timeout) { - error_report("iSCSI: ignoring timeout value for libiscsi <1.15.0"); - } -#endif - - 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->aio_context = bdrv_get_aio_context(bs); - 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_modesense_sync(iscsilun); - - /* Check the write protect flag of the LUN if we want to write */ - if (iscsilun->type == TYPE_DISK && (flags & BDRV_O_RDWR) && - iscsilun->write_protected) { - error_setg(errp, "Cannot open a write protected LUN as read-write"); - ret = -EACCES; - goto out; - } - - 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; - - iscsi_attach_aio_context(bs, iscsilun->aio_context); - - /* 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 */ - if (iscsilun->bl.opt_unmap_gran * iscsilun->block_size >= 4 * 1024 && - iscsilun->bl.opt_unmap_gran * iscsilun->block_size <= 16 * 1024 * 1024) { - iscsilun->cluster_sectors = (iscsilun->bl.opt_unmap_gran * - iscsilun->block_size) >> BDRV_SECTOR_BITS; - if (iscsilun->lbprz) { - iscsilun->allocationmap = iscsi_allocationmap_init(iscsilun); - if (iscsilun->allocationmap == NULL) { - ret = -ENOMEM; - } - } - } - -out: - qemu_opts_del(opts); - 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) { - if (iscsi_is_logged_in(iscsi)) { - iscsi_logout_sync(iscsi); - } - 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; - - iscsi_detach_aio_context(bs); - if (iscsi_is_logged_in(iscsi)) { - iscsi_logout_sync(iscsi); - } - iscsi_destroy_context(iscsi); - g_free(iscsilun->zeroblock); - g_free(iscsilun->allocationmap); - memset(iscsilun, 0, sizeof(IscsiLun)); -} - -static int sector_limits_lun2qemu(int64_t sector, IscsiLun *iscsilun) -{ - return MIN(sector_lun2qemu(sector, iscsilun), INT_MAX / 2 + 1); -} - -static void iscsi_refresh_limits(BlockDriverState *bs, Error **errp) -{ - /* We don't actually refresh here, but just return data queried in - * iscsi_open(): iscsi targets don't change their limits. */ - - IscsiLun *iscsilun = bs->opaque; - uint32_t max_xfer_len = iscsilun->use_16_for_rw ? 0xffffffff : 0xffff; - - if (iscsilun->bl.max_xfer_len) { - max_xfer_len = MIN(max_xfer_len, iscsilun->bl.max_xfer_len); - } - - bs->bl.max_transfer_length = sector_limits_lun2qemu(max_xfer_len, iscsilun); - - if (iscsilun->lbp.lbpu) { - if (iscsilun->bl.max_unmap < 0xffffffff) { - bs->bl.max_discard = - sector_limits_lun2qemu(iscsilun->bl.max_unmap, iscsilun); - } - bs->bl.discard_alignment = - sector_limits_lun2qemu(iscsilun->bl.opt_unmap_gran, iscsilun); - } - - if (iscsilun->bl.max_ws_len < 0xffffffff) { - bs->bl.max_write_zeroes = - sector_limits_lun2qemu(iscsilun->bl.max_ws_len, iscsilun); - } - if (iscsilun->lbp.lbpws) { - bs->bl.write_zeroes_alignment = - sector_limits_lun2qemu(iscsilun->bl.opt_unmap_gran, iscsilun); - } - bs->bl.opt_transfer_length = - sector_limits_lun2qemu(iscsilun->bl.opt_xfer_len, iscsilun); -} - -/* 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) -{ - IscsiLun *iscsilun = state->bs->opaque; - - if (state->flags & BDRV_O_RDWR && iscsilun->write_protected) { - error_setg(errp, "Cannot open a write protected LUN as read-write"); - return -EACCES; - } - 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; - } - - if (iscsilun->allocationmap != NULL) { - g_free(iscsilun->allocationmap); - iscsilun->allocationmap = iscsi_allocationmap_init(iscsilun); - } - - return 0; -} - -static int iscsi_create(const char *filename, QemuOpts *opts, Error **errp) -{ - int ret = 0; - int64_t total_size = 0; - BlockDriverState *bs; - IscsiLun *iscsilun = NULL; - QDict *bs_options; - - bs = bdrv_new(); - - /* Read out options */ - total_size = DIV_ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), - BDRV_SECTOR_SIZE); - bs->opaque = g_new0(struct IscsiLun, 1); - 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; - } - iscsi_detach_aio_context(bs); - 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; - bdi->cluster_size = iscsilun->cluster_sectors * BDRV_SECTOR_SIZE; - return 0; -} - -static QemuOptsList iscsi_create_opts = { - .name = "iscsi-create-opts", - .head = QTAILQ_HEAD_INITIALIZER(iscsi_create_opts.head), - .desc = { - { - .name = BLOCK_OPT_SIZE, - .type = QEMU_OPT_SIZE, - .help = "Virtual disk size" - }, - { /* end of list */ } - } -}; - -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_opts = &iscsi_create_opts, - .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, - - .bdrv_co_get_block_status = iscsi_co_get_block_status, - .bdrv_co_discard = iscsi_co_discard, - .bdrv_co_write_zeroes = iscsi_co_write_zeroes, - .bdrv_co_readv = iscsi_co_readv, - .bdrv_co_writev = iscsi_co_writev, - .bdrv_co_writev_flags = iscsi_co_writev_flags, - .supported_write_flags = BDRV_REQ_FUA, - .bdrv_co_flush_to_disk = iscsi_co_flush, - -#ifdef __linux__ - .bdrv_aio_ioctl = iscsi_aio_ioctl, -#endif - - .bdrv_detach_aio_context = iscsi_detach_aio_context, - .bdrv_attach_aio_context = iscsi_attach_aio_context, -}; - -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 = "password-secret", - .type = QEMU_OPT_STRING, - .help = "ID of the secret providing 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", - },{ - .name = "timeout", - .type = QEMU_OPT_NUMBER, - .help = "Request timeout in seconds (default 0 = no timeout)", - }, - { /* end of list */ } - }, -}; - -static void iscsi_block_init(void) -{ - bdrv_register(&bdrv_iscsi); - qemu_add_opts(&qemu_iscsi_opts); -} - -block_init(iscsi_block_init); |