diff options
Diffstat (limited to 'qemu/block/iscsi.c')
| -rw-r--r-- | qemu/block/iscsi.c | 1815 |
1 files changed, 1815 insertions, 0 deletions
diff --git a/qemu/block/iscsi.c b/qemu/block/iscsi.c new file mode 100644 index 000000000..50029168e --- /dev/null +++ b/qemu/block/iscsi.c @@ -0,0 +1,1815 @@ +/* + * 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 "config-host.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 <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 force_next_flush; + 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; + bool force_next_flush; +} 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; +#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_STATUS_TASK_SET_FULL and SCSI_STATUS_TIMEOUT were introduced + * in libiscsi 1.10.0 as part of an enum. The LIBISCSI_API_VERSION + * macro was introduced in 1.11.0. So use the API_VERSION macro as + * a hint that the macros are defined and define them ourselves + * otherwise to keep the required libiscsi version at 1.9.0 */ +#if !defined(LIBISCSI_API_VERSION) +#define QEMU_SCSI_STATUS_TASK_SET_FULL 0x28 +#define QEMU_SCSI_STATUS_TIMEOUT 0x0f000002 +#else +#define QEMU_SCSI_STATUS_TASK_SET_FULL SCSI_STATUS_TASK_SET_FULL +#define QEMU_SCSI_STATUS_TIMEOUT SCSI_STATUS_TIMEOUT +#endif + +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 == QEMU_SCSI_STATUS_TIMEOUT || + status == QEMU_SCSI_STATUS_TASK_SET_FULL) { + unsigned retry_time = + exp_random(iscsi_retry_times[iTask->retries - 1]); + if (status == QEMU_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; + } + } + error_report("iSCSI Failure: %s", iscsi_get_error(iscsi)); + } else { + iTask->iscsilun->force_next_flush |= iTask->force_next_flush; + } + +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), + (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(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; + int 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 && !bs->enable_write_cache; + iTask.force_next_flush = !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 -EIO; + } + + iscsi_allocationmap_set(iscsilun, sector_num, nb_sectors); + + return 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) +{ + 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); + } + 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; + ret = iscsi_co_get_block_status(bs, sector_num, INT_MAX, &pnum); + 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 -EIO; + } + + return 0; +} + +static int coroutine_fn iscsi_co_flush(BlockDriverState *bs) +{ + IscsiLun *iscsilun = bs->opaque; + struct IscsiTask iTask; + + if (!iscsilun->force_next_flush) { + return 0; + } + iscsilun->force_next_flush = false; + + 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 -EIO; + } + + 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 = -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 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; + + assert(req == SG_IO); + + 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; + + 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; +} + +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) { + aio_poll(iscsilun->aio_context, true); + } + + 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 +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; + } + + 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); + iTask.force_next_flush = true; +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 -EIO; + } + + 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; + + 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; +} + +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; + 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_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), + 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_flush_to_disk = iscsi_co_flush, + +#ifdef __linux__ + .bdrv_ioctl = iscsi_ioctl, + .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 = "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); |