| /* |
| * QEMU Block driver for iSCSI images |
| * |
| * Copyright (c) 2010-2011 Ronnie Sahlberg <ronniesahlberg@gmail.com> |
| * Copyright (c) 2012-2017 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/config-file.h" |
| #include "qemu/error-report.h" |
| #include "qemu/bitops.h" |
| #include "qemu/bitmap.h" |
| #include "block/block_int.h" |
| #include "scsi/constants.h" |
| #include "qemu/iov.h" |
| #include "qemu/option.h" |
| #include "qemu/uuid.h" |
| #include "qapi/error.h" |
| #include "qapi/qapi-commands-misc.h" |
| #include "qapi/qmp/qdict.h" |
| #include "qapi/qmp/qstring.h" |
| #include "crypto/secret.h" |
| #include "scsi/utils.h" |
| |
| /* Conflict between scsi/utils.h and libiscsi! :( */ |
| #define SCSI_XFER_NONE ISCSI_XFER_NONE |
| #include <iscsi/iscsi.h> |
| #include <iscsi/scsi-lowlevel.h> |
| #undef SCSI_XFER_NONE |
| QEMU_BUILD_BUG_ON((int)SCSI_XFER_NONE != (int)ISCSI_XFER_NONE); |
| |
| #ifdef __linux__ |
| #include <scsi/sg.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; |
| QemuMutex mutex; |
| struct scsi_inquiry_logical_block_provisioning lbp; |
| struct scsi_inquiry_block_limits bl; |
| unsigned char *zeroblock; |
| /* The allocmap tracks which clusters (pages) on the iSCSI target are |
| * allocated and which are not. In case a target returns zeros for |
| * unallocated pages (iscsilun->lprz) we can directly return zeros instead |
| * of reading zeros over the wire if a read request falls within an |
| * unallocated block. As there are 3 possible states we need 2 bitmaps to |
| * track. allocmap_valid keeps track if QEMU's information about a page is |
| * valid. allocmap tracks if a page is allocated or not. In case QEMU has no |
| * valid information about a page the corresponding allocmap entry should be |
| * switched to unallocated as well to force a new lookup of the allocation |
| * status as lookups are generally skipped if a page is suspect to be |
| * allocated. If a iSCSI target is opened with cache.direct = on the |
| * allocmap_valid does not exist turning all cached information invalid so |
| * that a fresh lookup is made for any page even if allocmap entry returns |
| * it's unallocated. */ |
| unsigned long *allocmap; |
| unsigned long *allocmap_valid; |
| long allocmap_size; |
| int cluster_size; |
| 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; |
| IscsiLun *iscsilun; |
| QEMUTimer retry_timer; |
| int err_code; |
| char *err_str; |
| } IscsiTask; |
| |
| typedef struct IscsiAIOCB { |
| BlockAIOCB common; |
| 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; |
| aio_co_wake(iTask->co); |
| } |
| |
| static void iscsi_retry_timer_expired(void *opaque) |
| { |
| struct IscsiTask *iTask = opaque; |
| iTask->complete = 1; |
| if (iTask->co) { |
| aio_co_wake(iTask->co); |
| } |
| } |
| |
| 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 |
| |
| #ifndef LIBISCSI_API_VERSION |
| #define LIBISCSI_API_VERSION 20130701 |
| #endif |
| |
| static int iscsi_translate_sense(struct scsi_sense *sense) |
| { |
| return - scsi_sense_to_errno(sense->key, |
| (sense->ascq & 0xFF00) >> 8, |
| sense->ascq & 0xFF); |
| } |
| |
| /* Called (via iscsi_service) with QemuMutex held. */ |
| 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); |
| iTask->err_str = g_strdup(iscsi_get_error(iscsi)); |
| } |
| |
| out: |
| if (iTask->co) { |
| aio_bh_schedule_oneshot(iTask->iscsilun->aio_context, |
| iscsi_co_generic_bh_cb, iTask); |
| } 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); |
| |
| /* Called with QemuMutex held. */ |
| 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, |
| 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; |
| |
| qemu_mutex_lock(&iscsilun->mutex); |
| iscsi_service(iscsi, POLLIN); |
| iscsi_set_events(iscsilun); |
| qemu_mutex_unlock(&iscsilun->mutex); |
| } |
| |
| static void |
| iscsi_process_write(void *arg) |
| { |
| IscsiLun *iscsilun = arg; |
| struct iscsi_context *iscsi = iscsilun->iscsi; |
| |
| qemu_mutex_lock(&iscsilun->mutex); |
| iscsi_service(iscsi, POLLOUT); |
| iscsi_set_events(iscsilun); |
| qemu_mutex_unlock(&iscsilun->mutex); |
| } |
| |
| 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_byte_request_lun_aligned(int64_t offset, int count, |
| IscsiLun *iscsilun) |
| { |
| if (offset % iscsilun->block_size || count % iscsilun->block_size) { |
| error_report("iSCSI misaligned request: " |
| "iscsilun->block_size %u, offset %" PRIi64 |
| ", count %d", |
| iscsilun->block_size, offset, count); |
| return false; |
| } |
| return true; |
| } |
| |
| static bool is_sector_request_lun_aligned(int64_t sector_num, int nb_sectors, |
| IscsiLun *iscsilun) |
| { |
| assert(nb_sectors <= BDRV_REQUEST_MAX_SECTORS); |
| return is_byte_request_lun_aligned(sector_num << BDRV_SECTOR_BITS, |
| nb_sectors << BDRV_SECTOR_BITS, |
| iscsilun); |
| } |
| |
| static void iscsi_allocmap_free(IscsiLun *iscsilun) |
| { |
| g_free(iscsilun->allocmap); |
| g_free(iscsilun->allocmap_valid); |
| iscsilun->allocmap = NULL; |
| iscsilun->allocmap_valid = NULL; |
| } |
| |
| |
| static int iscsi_allocmap_init(IscsiLun *iscsilun, int open_flags) |
| { |
| iscsi_allocmap_free(iscsilun); |
| |
| assert(iscsilun->cluster_size); |
| iscsilun->allocmap_size = |
| DIV_ROUND_UP(iscsilun->num_blocks * iscsilun->block_size, |
| iscsilun->cluster_size); |
| |
| iscsilun->allocmap = bitmap_try_new(iscsilun->allocmap_size); |
| if (!iscsilun->allocmap) { |
| return -ENOMEM; |
| } |
| |
| if (open_flags & BDRV_O_NOCACHE) { |
| /* when cache.direct = on all allocmap entries are |
| * treated as invalid to force a relookup of the block |
| * status on every read request */ |
| return 0; |
| } |
| |
| iscsilun->allocmap_valid = bitmap_try_new(iscsilun->allocmap_size); |
| if (!iscsilun->allocmap_valid) { |
| /* if we are under memory pressure free the allocmap as well */ |
| iscsi_allocmap_free(iscsilun); |
| return -ENOMEM; |
| } |
| |
| return 0; |
| } |
| |
| static void |
| iscsi_allocmap_update(IscsiLun *iscsilun, int64_t offset, |
| int64_t bytes, bool allocated, bool valid) |
| { |
| int64_t cl_num_expanded, nb_cls_expanded, cl_num_shrunk, nb_cls_shrunk; |
| |
| if (iscsilun->allocmap == NULL) { |
| return; |
| } |
| /* expand to entirely contain all affected clusters */ |
| assert(iscsilun->cluster_size); |
| cl_num_expanded = offset / iscsilun->cluster_size; |
| nb_cls_expanded = DIV_ROUND_UP(offset + bytes, |
| iscsilun->cluster_size) - cl_num_expanded; |
| /* shrink to touch only completely contained clusters */ |
| cl_num_shrunk = DIV_ROUND_UP(offset, iscsilun->cluster_size); |
| nb_cls_shrunk = (offset + bytes) / iscsilun->cluster_size - cl_num_shrunk; |
| if (allocated) { |
| bitmap_set(iscsilun->allocmap, cl_num_expanded, nb_cls_expanded); |
| } else { |
| if (nb_cls_shrunk > 0) { |
| bitmap_clear(iscsilun->allocmap, cl_num_shrunk, nb_cls_shrunk); |
| } |
| } |
| |
| if (iscsilun->allocmap_valid == NULL) { |
| return; |
| } |
| if (valid) { |
| if (nb_cls_shrunk > 0) { |
| bitmap_set(iscsilun->allocmap_valid, cl_num_shrunk, nb_cls_shrunk); |
| } |
| } else { |
| bitmap_clear(iscsilun->allocmap_valid, cl_num_expanded, |
| nb_cls_expanded); |
| } |
| } |
| |
| static void |
| iscsi_allocmap_set_allocated(IscsiLun *iscsilun, int64_t offset, |
| int64_t bytes) |
| { |
| iscsi_allocmap_update(iscsilun, offset, bytes, true, true); |
| } |
| |
| static void |
| iscsi_allocmap_set_unallocated(IscsiLun *iscsilun, int64_t offset, |
| int64_t bytes) |
| { |
| /* Note: if cache.direct=on the fifth argument to iscsi_allocmap_update |
| * is ignored, so this will in effect be an iscsi_allocmap_set_invalid. |
| */ |
| iscsi_allocmap_update(iscsilun, offset, bytes, false, true); |
| } |
| |
| static void iscsi_allocmap_set_invalid(IscsiLun *iscsilun, int64_t offset, |
| int64_t bytes) |
| { |
| iscsi_allocmap_update(iscsilun, offset, bytes, false, false); |
| } |
| |
| static void iscsi_allocmap_invalidate(IscsiLun *iscsilun) |
| { |
| if (iscsilun->allocmap) { |
| bitmap_zero(iscsilun->allocmap, iscsilun->allocmap_size); |
| } |
| if (iscsilun->allocmap_valid) { |
| bitmap_zero(iscsilun->allocmap_valid, iscsilun->allocmap_size); |
| } |
| } |
| |
| static inline bool |
| iscsi_allocmap_is_allocated(IscsiLun *iscsilun, int64_t offset, |
| int64_t bytes) |
| { |
| unsigned long size; |
| if (iscsilun->allocmap == NULL) { |
| return true; |
| } |
| assert(iscsilun->cluster_size); |
| size = DIV_ROUND_UP(offset + bytes, iscsilun->cluster_size); |
| return !(find_next_bit(iscsilun->allocmap, size, |
| offset / iscsilun->cluster_size) == size); |
| } |
| |
| static inline bool iscsi_allocmap_is_valid(IscsiLun *iscsilun, |
| int64_t offset, int64_t bytes) |
| { |
| unsigned long size; |
| if (iscsilun->allocmap_valid == NULL) { |
| return false; |
| } |
| assert(iscsilun->cluster_size); |
| size = DIV_ROUND_UP(offset + bytes, iscsilun->cluster_size); |
| return (find_next_zero_bit(iscsilun->allocmap_valid, size, |
| offset / iscsilun->cluster_size) == size); |
| } |
| |
| 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 = flags & BDRV_REQ_FUA; |
| int r = 0; |
| |
| if (fua) { |
| assert(iscsilun->dpofua); |
| } |
| if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { |
| return -EINVAL; |
| } |
| |
| if (bs->bl.max_transfer) { |
| assert(nb_sectors << BDRV_SECTOR_BITS <= bs->bl.max_transfer); |
| } |
| |
| lba = sector_qemu2lun(sector_num, iscsilun); |
| num_sectors = sector_qemu2lun(nb_sectors, iscsilun); |
| iscsi_co_init_iscsitask(iscsilun, &iTask); |
| qemu_mutex_lock(&iscsilun->mutex); |
| retry: |
| if (iscsilun->use_16_for_rw) { |
| #if LIBISCSI_API_VERSION >= (20160603) |
| iTask.task = iscsi_write16_iov_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, |
| (struct scsi_iovec *)iov->iov, iov->niov); |
| } else { |
| iTask.task = iscsi_write10_iov_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, |
| (struct scsi_iovec *)iov->iov, iov->niov); |
| } |
| #else |
| 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); |
| } |
| #endif |
| if (iTask.task == NULL) { |
| qemu_mutex_unlock(&iscsilun->mutex); |
| return -ENOMEM; |
| } |
| #if LIBISCSI_API_VERSION < (20160603) |
| scsi_task_set_iov_out(iTask.task, (struct scsi_iovec *) iov->iov, |
| iov->niov); |
| #endif |
| while (!iTask.complete) { |
| iscsi_set_events(iscsilun); |
| qemu_mutex_unlock(&iscsilun->mutex); |
| qemu_coroutine_yield(); |
| qemu_mutex_lock(&iscsilun->mutex); |
| } |
| |
| 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) { |
| iscsi_allocmap_set_invalid(iscsilun, sector_num * BDRV_SECTOR_SIZE, |
| nb_sectors * BDRV_SECTOR_SIZE); |
| error_report("iSCSI WRITE10/16 failed at lba %" PRIu64 ": %s", lba, |
| iTask.err_str); |
| r = iTask.err_code; |
| goto out_unlock; |
| } |
| |
| iscsi_allocmap_set_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE, |
| nb_sectors * BDRV_SECTOR_SIZE); |
| |
| out_unlock: |
| qemu_mutex_unlock(&iscsilun->mutex); |
| g_free(iTask.err_str); |
| return r; |
| } |
| |
| |
| |
| static int coroutine_fn iscsi_co_block_status(BlockDriverState *bs, |
| bool want_zero, int64_t offset, |
| int64_t bytes, int64_t *pnum, |
| int64_t *map, |
| BlockDriverState **file) |
| { |
| IscsiLun *iscsilun = bs->opaque; |
| struct scsi_get_lba_status *lbas = NULL; |
| struct scsi_lba_status_descriptor *lbasd = NULL; |
| struct IscsiTask iTask; |
| uint64_t lba; |
| int ret; |
| |
| iscsi_co_init_iscsitask(iscsilun, &iTask); |
| |
| assert(QEMU_IS_ALIGNED(offset | bytes, iscsilun->block_size)); |
| |
| /* default to all sectors allocated */ |
| ret = BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID; |
| if (map) { |
| *map = offset; |
| } |
| *pnum = bytes; |
| |
| /* LUN does not support logical block provisioning */ |
| if (!iscsilun->lbpme) { |
| goto out; |
| } |
| |
| lba = offset / iscsilun->block_size; |
| |
| qemu_mutex_lock(&iscsilun->mutex); |
| retry: |
| if (iscsi_get_lba_status_task(iscsilun->iscsi, iscsilun->lun, |
| lba, 8 + 16, iscsi_co_generic_cb, |
| &iTask) == NULL) { |
| ret = -ENOMEM; |
| goto out_unlock; |
| } |
| |
| while (!iTask.complete) { |
| iscsi_set_events(iscsilun); |
| qemu_mutex_unlock(&iscsilun->mutex); |
| qemu_coroutine_yield(); |
| qemu_mutex_lock(&iscsilun->mutex); |
| } |
| |
| 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 */ |
| error_report("iSCSI GET_LBA_STATUS failed at lba %" PRIu64 ": %s", |
| lba, iTask.err_str); |
| goto out_unlock; |
| } |
| |
| lbas = scsi_datain_unmarshall(iTask.task); |
| if (lbas == NULL) { |
| ret = -EIO; |
| goto out_unlock; |
| } |
| |
| lbasd = &lbas->descriptors[0]; |
| |
| if (lba != lbasd->lba) { |
| ret = -EIO; |
| goto out_unlock; |
| } |
| |
| *pnum = lbasd->num_blocks * iscsilun->block_size; |
| |
| 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_allocmap_set_unallocated(iscsilun, offset, *pnum); |
| } else { |
| iscsi_allocmap_set_allocated(iscsilun, offset, *pnum); |
| } |
| |
| if (*pnum > bytes) { |
| *pnum = bytes; |
| } |
| out_unlock: |
| qemu_mutex_unlock(&iscsilun->mutex); |
| g_free(iTask.err_str); |
| out: |
| if (iTask.task != NULL) { |
| scsi_free_scsi_task(iTask.task); |
| } |
| if (ret > 0 && ret & BDRV_BLOCK_OFFSET_VALID && file) { |
| *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; |
| int r = 0; |
| |
| if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { |
| return -EINVAL; |
| } |
| |
| if (bs->bl.max_transfer) { |
| assert(nb_sectors << BDRV_SECTOR_BITS <= bs->bl.max_transfer); |
| } |
| |
| /* if cache.direct is off and we have a valid entry in our allocation map |
| * we can skip checking the block status and directly return zeroes if |
| * the request falls within an unallocated area */ |
| if (iscsi_allocmap_is_valid(iscsilun, sector_num * BDRV_SECTOR_SIZE, |
| nb_sectors * BDRV_SECTOR_SIZE) && |
| !iscsi_allocmap_is_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE, |
| nb_sectors * BDRV_SECTOR_SIZE)) { |
| qemu_iovec_memset(iov, 0, 0x00, iov->size); |
| return 0; |
| } |
| |
| if (nb_sectors >= ISCSI_CHECKALLOC_THRES && |
| !iscsi_allocmap_is_valid(iscsilun, sector_num * BDRV_SECTOR_SIZE, |
| nb_sectors * BDRV_SECTOR_SIZE) && |
| !iscsi_allocmap_is_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE, |
| nb_sectors * BDRV_SECTOR_SIZE)) { |
| int64_t pnum; |
| /* check the block status from the beginning of the cluster |
| * containing the start sector */ |
| int64_t head; |
| int ret; |
| |
| assert(iscsilun->cluster_size); |
| head = (sector_num * BDRV_SECTOR_SIZE) % iscsilun->cluster_size; |
| ret = iscsi_co_block_status(bs, true, |
| sector_num * BDRV_SECTOR_SIZE - head, |
| BDRV_REQUEST_MAX_BYTES, &pnum, NULL, NULL); |
| if (ret < 0) { |
| return ret; |
| } |
| /* if the whole request falls into an unallocated area we can avoid |
| * reading and directly return zeroes instead */ |
| if (ret & BDRV_BLOCK_ZERO && |
| pnum >= nb_sectors * BDRV_SECTOR_SIZE + head) { |
| 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); |
| qemu_mutex_lock(&iscsilun->mutex); |
| retry: |
| if (iscsilun->use_16_for_rw) { |
| #if LIBISCSI_API_VERSION >= (20160603) |
| iTask.task = iscsi_read16_iov_task(iscsilun->iscsi, iscsilun->lun, lba, |
| num_sectors * iscsilun->block_size, |
| iscsilun->block_size, 0, 0, 0, 0, 0, |
| iscsi_co_generic_cb, &iTask, |
| (struct scsi_iovec *)iov->iov, iov->niov); |
| } else { |
| iTask.task = iscsi_read10_iov_task(iscsilun->iscsi, iscsilun->lun, lba, |
| num_sectors * iscsilun->block_size, |
| iscsilun->block_size, |
| 0, 0, 0, 0, 0, |
| iscsi_co_generic_cb, &iTask, |
| (struct scsi_iovec *)iov->iov, iov->niov); |
| } |
| #else |
| 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); |
| } |
| #endif |
| if (iTask.task == NULL) { |
| qemu_mutex_unlock(&iscsilun->mutex); |
| return -ENOMEM; |
| } |
| #if LIBISCSI_API_VERSION < (20160603) |
| scsi_task_set_iov_in(iTask.task, (struct scsi_iovec *) iov->iov, iov->niov); |
| #endif |
| while (!iTask.complete) { |
| iscsi_set_events(iscsilun); |
| qemu_mutex_unlock(&iscsilun->mutex); |
| qemu_coroutine_yield(); |
| qemu_mutex_lock(&iscsilun->mutex); |
| } |
| |
| 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) { |
| error_report("iSCSI READ10/16 failed at lba %" PRIu64 ": %s", |
| lba, iTask.err_str); |
| r = iTask.err_code; |
| } |
| |
| qemu_mutex_unlock(&iscsilun->mutex); |
| g_free(iTask.err_str); |
| return r; |
| } |
| |
| static int coroutine_fn iscsi_co_flush(BlockDriverState *bs) |
| { |
| IscsiLun *iscsilun = bs->opaque; |
| struct IscsiTask iTask; |
| int r = 0; |
| |
| iscsi_co_init_iscsitask(iscsilun, &iTask); |
| qemu_mutex_lock(&iscsilun->mutex); |
| retry: |
| if (iscsi_synchronizecache10_task(iscsilun->iscsi, iscsilun->lun, 0, 0, 0, |
| 0, iscsi_co_generic_cb, &iTask) == NULL) { |
| qemu_mutex_unlock(&iscsilun->mutex); |
| return -ENOMEM; |
| } |
| |
| while (!iTask.complete) { |
| iscsi_set_events(iscsilun); |
| qemu_mutex_unlock(&iscsilun->mutex); |
| qemu_coroutine_yield(); |
| qemu_mutex_lock(&iscsilun->mutex); |
| } |
| |
| 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) { |
| error_report("iSCSI SYNCHRONIZECACHE10 failed: %s", iTask.err_str); |
| r = iTask.err_code; |
| } |
| |
| qemu_mutex_unlock(&iscsilun->mutex); |
| g_free(iTask.err_str); |
| return r; |
| } |
| |
| #ifdef __linux__ |
| /* Called (via iscsi_service) with QemuMutex held. */ |
| 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; |
| acb->ioh->status = status; |
| |
| #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; |
| } |
| |
| if (acb->ioh->cmd_len > SCSI_CDB_MAX_SIZE) { |
| error_report("iSCSI: ioctl error CDB exceeds max size (%d > %d)", |
| acb->ioh->cmd_len, SCSI_CDB_MAX_SIZE); |
| qemu_aio_unref(acb); |
| return NULL; |
| } |
| |
| 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; |
| qemu_mutex_lock(&iscsilun->mutex); |
| 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) { |
| qemu_mutex_unlock(&iscsilun->mutex); |
| 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); |
| qemu_mutex_unlock(&iscsilun->mutex); |
| |
| 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_pdiscard(BlockDriverState *bs, int64_t offset, int bytes) |
| { |
| IscsiLun *iscsilun = bs->opaque; |
| struct IscsiTask iTask; |
| struct unmap_list list; |
| int r = 0; |
| |
| if (!is_byte_request_lun_aligned(offset, bytes, iscsilun)) { |
| return -ENOTSUP; |
| } |
| |
| if (!iscsilun->lbp.lbpu) { |
| /* UNMAP is not supported by the target */ |
| return 0; |
| } |
| |
| list.lba = offset / iscsilun->block_size; |
| list.num = bytes / iscsilun->block_size; |
| |
| iscsi_co_init_iscsitask(iscsilun, &iTask); |
| qemu_mutex_lock(&iscsilun->mutex); |
| retry: |
| if (iscsi_unmap_task(iscsilun->iscsi, iscsilun->lun, 0, 0, &list, 1, |
| iscsi_co_generic_cb, &iTask) == NULL) { |
| r = -ENOMEM; |
| goto out_unlock; |
| } |
| |
| while (!iTask.complete) { |
| iscsi_set_events(iscsilun); |
| qemu_mutex_unlock(&iscsilun->mutex); |
| qemu_coroutine_yield(); |
| qemu_mutex_lock(&iscsilun->mutex); |
| } |
| |
| if (iTask.task != NULL) { |
| scsi_free_scsi_task(iTask.task); |
| iTask.task = NULL; |
| } |
| |
| if (iTask.do_retry) { |
| iTask.complete = 0; |
| goto retry; |
| } |
| |
| iscsi_allocmap_set_invalid(iscsilun, offset, bytes); |
| |
| 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 */ |
| goto out_unlock; |
| } |
| |
| if (iTask.status != SCSI_STATUS_GOOD) { |
| error_report("iSCSI UNMAP failed at lba %" PRIu64 ": %s", |
| list.lba, iTask.err_str); |
| r = iTask.err_code; |
| goto out_unlock; |
| } |
| |
| out_unlock: |
| qemu_mutex_unlock(&iscsilun->mutex); |
| g_free(iTask.err_str); |
| return r; |
| } |
| |
| static int |
| coroutine_fn iscsi_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset, |
| int bytes, 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; |
| int r = 0; |
| |
| if (!is_byte_request_lun_aligned(offset, bytes, iscsilun)) { |
| return -ENOTSUP; |
| } |
| |
| 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 = offset / iscsilun->block_size; |
| nb_blocks = bytes / iscsilun->block_size; |
| |
| if (iscsilun->zeroblock == NULL) { |
| iscsilun->zeroblock = g_try_malloc0(iscsilun->block_size); |
| if (iscsilun->zeroblock == NULL) { |
| return -ENOMEM; |
| } |
| } |
| |
| qemu_mutex_lock(&iscsilun->mutex); |
| 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) { |
| qemu_mutex_unlock(&iscsilun->mutex); |
| return -ENOMEM; |
| } |
| |
| while (!iTask.complete) { |
| iscsi_set_events(iscsilun); |
| qemu_mutex_unlock(&iscsilun->mutex); |
| qemu_coroutine_yield(); |
| qemu_mutex_lock(&iscsilun->mutex); |
| } |
| |
| 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); |
| r = -ENOTSUP; |
| goto out_unlock; |
| } |
| |
| 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) { |
| iscsi_allocmap_set_invalid(iscsilun, offset, bytes); |
| error_report("iSCSI WRITESAME10/16 failed at lba %" PRIu64 ": %s", |
| lba, iTask.err_str); |
| r = iTask.err_code; |
| goto out_unlock; |
| } |
| |
| if (flags & BDRV_REQ_MAY_UNMAP) { |
| iscsi_allocmap_set_invalid(iscsilun, offset, bytes); |
| } else { |
| iscsi_allocmap_set_allocated(iscsilun, offset, bytes); |
| } |
| |
| out_unlock: |
| qemu_mutex_unlock(&iscsilun->mutex); |
| g_free(iTask.err_str); |
| return r; |
| } |
| |
| static void apply_chap(struct iscsi_context *iscsi, QemuOpts *opts, |
| Error **errp) |
| { |
| const char *user = NULL; |
| const char *password = NULL; |
| const char *secretid; |
| char *secret = NULL; |
| |
| 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 apply_header_digest(struct iscsi_context *iscsi, QemuOpts *opts, |
| Error **errp) |
| { |
| const char *digest = NULL; |
| |
| digest = qemu_opt_get(opts, "header-digest"); |
| if (!digest) { |
| iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); |
| } else 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 *get_initiator_name(QemuOpts *opts) |
| { |
| const char *name; |
| char *iscsi_name; |
| UuidInfo *uuid_info; |
| |
| 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 void iscsi_nop_timed_event(void *opaque) |
| { |
| IscsiLun *iscsilun = opaque; |
| |
| qemu_mutex_lock(&iscsilun->mutex); |
| 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."); |
| goto out; |
| } |
| |
| timer_mod(iscsilun->nop_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); |
| iscsi_set_events(iscsilun); |
| |
| out: |
| qemu_mutex_unlock(&iscsilun->mutex); |
| } |
| |
| 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); |
| } |
| } |
| |
| 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, 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); |
| } |
| } |
| |
| static void iscsi_parse_iscsi_option(const char *target, QDict *options) |
| { |
| QemuOptsList *list; |
| QemuOpts *opts; |
| const char *user, *password, *password_secret, *initiator_name, |
| *header_digest, *timeout; |
| |
| 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) { |
| qdict_set_default_str(options, "user", user); |
| } |
| |
| password = qemu_opt_get(opts, "password"); |
| if (password) { |
| qdict_set_default_str(options, "password", password); |
| } |
| |
| password_secret = qemu_opt_get(opts, "password-secret"); |
| if (password_secret) { |
| qdict_set_default_str(options, "password-secret", password_secret); |
| } |
| |
| initiator_name = qemu_opt_get(opts, "initiator-name"); |
| if (initiator_name) { |
| qdict_set_default_str(options, "initiator-name", initiator_name); |
| } |
| |
| header_digest = qemu_opt_get(opts, "header-digest"); |
| if (header_digest) { |
| /* -iscsi takes upper case values, but QAPI only supports lower case |
| * enum constant names, so we have to convert here. */ |
| char *qapi_value = g_ascii_strdown(header_digest, -1); |
| qdict_set_default_str(options, "header-digest", qapi_value); |
| g_free(qapi_value); |
| } |
| |
| timeout = qemu_opt_get(opts, "timeout"); |
| if (timeout) { |
| qdict_set_default_str(options, "timeout", timeout); |
| } |
| } |
| |
| /* |
| * We support iscsi url's on the form |
| * iscsi://[<username>%<password>@]<host>[:<port>]/<targetname>/<lun> |
| */ |
| static void iscsi_parse_filename(const char *filename, QDict *options, |
| Error **errp) |
| { |
| struct iscsi_url *iscsi_url; |
| const char *transport_name; |
| char *lun_str; |
| |
| iscsi_url = iscsi_parse_full_url(NULL, filename); |
| if (iscsi_url == NULL) { |
| error_setg(errp, "Failed to parse URL : %s", filename); |
| return; |
| } |
| |
| #if LIBISCSI_API_VERSION >= (20160603) |
| switch (iscsi_url->transport) { |
| case TCP_TRANSPORT: |
| transport_name = "tcp"; |
| break; |
| case ISER_TRANSPORT: |
| transport_name = "iser"; |
| break; |
| default: |
| error_setg(errp, "Unknown transport type (%d)", |
| iscsi_url->transport); |
| return; |
| } |
| #else |
| transport_name = "tcp"; |
| #endif |
| |
| qdict_set_default_str(options, "transport", transport_name); |
| qdict_set_default_str(options, "portal", iscsi_url->portal); |
| qdict_set_default_str(options, "target", iscsi_url->target); |
| |
| lun_str = g_strdup_printf("%d", iscsi_url->lun); |
| qdict_set_default_str(options, "lun", lun_str); |
| g_free(lun_str); |
| |
| /* User/password from -iscsi take precedence over those from the URL */ |
| iscsi_parse_iscsi_option(iscsi_url->target, options); |
| |
| if (iscsi_url->user[0] != '\0') { |
| qdict_set_default_str(options, "user", iscsi_url->user); |
| qdict_set_default_str(options, "password", iscsi_url->passwd); |
| } |
| |
| iscsi_destroy_url(iscsi_url); |
| } |
| |
| static QemuOptsList runtime_opts = { |
| .name = "iscsi", |
| .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head), |
| .desc = { |
| { |
| .name = "transport", |
| .type = QEMU_OPT_STRING, |
| }, |
| { |
| .name = "portal", |
| .type = QEMU_OPT_STRING, |
| }, |
| { |
| .name = "target", |
| .type = QEMU_OPT_STRING, |
| }, |
| { |
| .name = "user", |
| .type = QEMU_OPT_STRING, |
| }, |
| { |
| .name = "password", |
| .type = QEMU_OPT_STRING, |
| }, |
| { |
| .name = "password-secret", |
| .type = QEMU_OPT_STRING, |
| }, |
| { |
| .name = "lun", |
| .type = QEMU_OPT_NUMBER, |
| }, |
| { |
| .name = "initiator-name", |
| .type = QEMU_OPT_STRING, |
| }, |
| { |
| .name = "header-digest", |
| .type = QEMU_OPT_STRING, |
| }, |
| { |
| .name = "timeout", |
| .type = QEMU_OPT_NUMBER, |
| }, |
| { |
| .name = "filename", |
| .type = QEMU_OPT_STRING, |
| }, |
| { /* end of list */ } |
| }, |
| }; |
| |
| static int iscsi_open(BlockDriverState *bs, QDict *options, int flags, |
| Error **errp) |
| { |
| IscsiLun *iscsilun = bs->opaque; |
| struct iscsi_context *iscsi = 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 *transport_name, *portal, *target, *filename; |
| #if LIBISCSI_API_VERSION >= (20160603) |
| enum iscsi_transport_type transport; |
| #endif |
| int i, ret = 0, timeout = 0, lun; |
| |
| /* If we are given a filename, parse the filename, with precedence given to |
| * filename encoded options */ |
| filename = qdict_get_try_str(options, "filename"); |
| if (filename) { |
| warn_report("'filename' option specified. " |
| "This is an unsupported option, and may be deprecated " |
| "in the future"); |
| iscsi_parse_filename(filename, options, &local_err); |
| if (local_err) { |
| ret = -EINVAL; |
| error_propagate(errp, local_err); |
| goto exit; |
| } |
| } |
| |
| 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; |
| } |
| |
| transport_name = qemu_opt_get(opts, "transport"); |
| portal = qemu_opt_get(opts, "portal"); |
| target = qemu_opt_get(opts, "target"); |
| lun = qemu_opt_get_number(opts, "lun", 0); |
| |
| if (!transport_name || !portal || !target) { |
| error_setg(errp, "Need all of transport, portal and target options"); |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| if (!strcmp(transport_name, "tcp")) { |
| #if LIBISCSI_API_VERSION >= (20160603) |
| transport = TCP_TRANSPORT; |
| } else if (!strcmp(transport_name, "iser")) { |
| transport = ISER_TRANSPORT; |
| #else |
| /* TCP is what older libiscsi versions always use */ |
| #endif |
| } else { |
| error_setg(errp, "Unknown transport: %s", transport_name); |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| memset(iscsilun, 0, sizeof(IscsiLun)); |
| |
| initiator_name = get_initiator_name(opts); |
| |
| iscsi = iscsi_create_context(initiator_name); |
| if (iscsi == NULL) { |
| error_setg(errp, "iSCSI: Failed to create iSCSI context."); |
| ret = -ENOMEM; |
| goto out; |
| } |
| #if LIBISCSI_API_VERSION >= (20160603) |
| if (iscsi_init_transport(iscsi, transport)) { |
| error_setg(errp, ("Error initializing transport.")); |
| ret = -EINVAL; |
| goto out; |
| } |
| #endif |
| if (iscsi_set_targetname(iscsi, target)) { |
| error_setg(errp, "iSCSI: Failed to set target name."); |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| /* check if we got CHAP username/password via the options */ |
| apply_chap(iscsi, opts, &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; |
| } |
| |
| /* check if we got HEADER_DIGEST via the options */ |
| apply_header_digest(iscsi, opts, &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 = qemu_opt_get_number(opts, "timeout", 0); |
| #if 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, portal, 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 = 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); |
| if (iscsilun->dpofua) { |
| bs->supported_write_flags = BDRV_REQ_FUA; |
| } |
| |
| /* 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); |
| |
| /* 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 = true; |
| } |
| |
| 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; |
| |
| qemu_mutex_init(&iscsilun->mutex); |
| 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_size = iscsilun->bl.opt_unmap_gran * |
| iscsilun->block_size; |
| if (iscsilun->lbprz) { |
| ret = iscsi_allocmap_init(iscsilun, bs->open_flags); |
| } |
| } |
| |
| if (iscsilun->lbprz && iscsilun->lbp.lbpws) { |
| bs->supported_zero_flags = BDRV_REQ_MAY_UNMAP; |
| } |
| |
| out: |
| qemu_opts_del(opts); |
| g_free(initiator_name); |
| 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)); |
| } |
| exit: |
| 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); |
| iscsi_allocmap_free(iscsilun); |
| qemu_mutex_destroy(&iscsilun->mutex); |
| memset(iscsilun, 0, sizeof(IscsiLun)); |
| } |
| |
| 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; |
| uint64_t max_xfer_len = iscsilun->use_16_for_rw ? 0xffffffff : 0xffff; |
| unsigned int block_size = MAX(BDRV_SECTOR_SIZE, iscsilun->block_size); |
| |
| assert(iscsilun->block_size >= BDRV_SECTOR_SIZE || bs->sg); |
| |
| bs->bl.request_alignment = block_size; |
| |
| if (iscsilun->bl.max_xfer_len) { |
| max_xfer_len = MIN(max_xfer_len, iscsilun->bl.max_xfer_len); |
| } |
| |
| if (max_xfer_len * block_size < INT_MAX) { |
| bs->bl.max_transfer = max_xfer_len * iscsilun->block_size; |
| } |
| |
| if (iscsilun->lbp.lbpu) { |
| if (iscsilun->bl.max_unmap < 0xffffffff / block_size) { |
| bs->bl.max_pdiscard = |
| iscsilun->bl.max_unmap * iscsilun->block_size; |
| } |
| bs->bl.pdiscard_alignment = |
| iscsilun->bl.opt_unmap_gran * iscsilun->block_size; |
| } else { |
| bs->bl.pdiscard_alignment = iscsilun->block_size; |
| } |
| |
| if (iscsilun->bl.max_ws_len < 0xffffffff / block_size) { |
| bs->bl.max_pwrite_zeroes = |
| iscsilun->bl.max_ws_len * iscsilun->block_size; |
| } |
| if (iscsilun->lbp.lbpws) { |
| bs->bl.pwrite_zeroes_alignment = |
| iscsilun->bl.opt_unmap_gran * iscsilun->block_size; |
| } else { |
| bs->bl.pwrite_zeroes_alignment = iscsilun->block_size; |
| } |
| if (iscsilun->bl.opt_xfer_len && |
| iscsilun->bl.opt_xfer_len < INT_MAX / block_size) { |
| bs->bl.opt_transfer = pow2floor(iscsilun->bl.opt_xfer_len * |
| iscsilun->block_size); |
| } |
| } |
| |
| /* 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 void iscsi_reopen_commit(BDRVReopenState *reopen_state) |
| { |
| IscsiLun *iscsilun = reopen_state->bs->opaque; |
| |
| /* the cache.direct status might have changed */ |
| if (iscsilun->allocmap != NULL) { |
| iscsi_allocmap_init(iscsilun, reopen_state->flags); |
| } |
| } |
| |
| static int iscsi_truncate(BlockDriverState *bs, int64_t offset, |
| PreallocMode prealloc, Error **errp) |
| { |
| IscsiLun *iscsilun = bs->opaque; |
| Error *local_err = NULL; |
| |
| if (prealloc != PREALLOC_MODE_OFF) { |
| error_setg(errp, "Unsupported preallocation mode '%s'", |
| PreallocMode_str(prealloc)); |
| return -ENOTSUP; |
| } |
| |
| if (iscsilun->type != TYPE_DISK) { |
| error_setg(errp, "Cannot resize non-disk iSCSI devices"); |
| return -ENOTSUP; |
| } |
| |
| iscsi_readcapacity_sync(iscsilun, &local_err); |
| if (local_err != NULL) { |
| error_propagate(errp, local_err); |
| return -EIO; |
| } |
| |
| if (offset > iscsi_getlength(bs)) { |
| error_setg(errp, "Cannot grow iSCSI devices"); |
| return -EINVAL; |
| } |
| |
| if (iscsilun->allocmap != NULL) { |
| iscsi_allocmap_init(iscsilun, bs->open_flags); |
| } |
| |
| return 0; |
| } |
| |
| static int coroutine_fn iscsi_co_create_opts(const char *filename, QemuOpts *opts, |
| Error **errp) |
| { |
| int ret = 0; |
| int64_t total_size = 0; |
| BlockDriverState *bs; |
| IscsiLun *iscsilun = NULL; |
| QDict *bs_options; |
| Error *local_err = NULL; |
| |
| 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(); |
| iscsi_parse_filename(filename, bs_options, &local_err); |
| if (local_err) { |
| error_propagate(errp, local_err); |
| ret = -EINVAL; |
| } else { |
| 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->cluster_size = iscsilun->cluster_size; |
| return 0; |
| } |
| |
| static void coroutine_fn iscsi_co_invalidate_cache(BlockDriverState *bs, |
| Error **errp) |
| { |
| IscsiLun *iscsilun = bs->opaque; |
| iscsi_allocmap_invalidate(iscsilun); |
| } |
| |
| 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_parse_filename = iscsi_parse_filename, |
| .bdrv_file_open = iscsi_open, |
| .bdrv_close = iscsi_close, |
| .bdrv_co_create_opts = iscsi_co_create_opts, |
| .create_opts = &iscsi_create_opts, |
| .bdrv_reopen_prepare = iscsi_reopen_prepare, |
| .bdrv_reopen_commit = iscsi_reopen_commit, |
| .bdrv_co_invalidate_cache = iscsi_co_invalidate_cache, |
| |
| .bdrv_getlength = iscsi_getlength, |
| .bdrv_get_info = iscsi_get_info, |
| .bdrv_truncate = iscsi_truncate, |
| .bdrv_refresh_limits = iscsi_refresh_limits, |
| |
| .bdrv_co_block_status = iscsi_co_block_status, |
| .bdrv_co_pdiscard = iscsi_co_pdiscard, |
| .bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes, |
| .bdrv_co_readv = iscsi_co_readv, |
| .bdrv_co_writev_flags = iscsi_co_writev_flags, |
| .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, |
| }; |
| |
| #if LIBISCSI_API_VERSION >= (20160603) |
| static BlockDriver bdrv_iser = { |
| .format_name = "iser", |
| .protocol_name = "iser", |
| |
| .instance_size = sizeof(IscsiLun), |
| .bdrv_parse_filename = iscsi_parse_filename, |
| .bdrv_file_open = iscsi_open, |
| .bdrv_close = iscsi_close, |
| .bdrv_co_create_opts = iscsi_co_create_opts, |
| .create_opts = &iscsi_create_opts, |
| .bdrv_reopen_prepare = iscsi_reopen_prepare, |
| .bdrv_reopen_commit = iscsi_reopen_commit, |
| .bdrv_co_invalidate_cache = iscsi_co_invalidate_cache, |
| |
| .bdrv_getlength = iscsi_getlength, |
| .bdrv_get_info = iscsi_get_info, |
| .bdrv_truncate = iscsi_truncate, |
| .bdrv_refresh_limits = iscsi_refresh_limits, |
| |
| .bdrv_co_block_status = iscsi_co_block_status, |
| .bdrv_co_pdiscard = iscsi_co_pdiscard, |
| .bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes, |
| .bdrv_co_readv = iscsi_co_readv, |
| .bdrv_co_writev_flags = iscsi_co_writev_flags, |
| .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, |
| }; |
| #endif |
| |
| static void iscsi_block_init(void) |
| { |
| bdrv_register(&bdrv_iscsi); |
| #if LIBISCSI_API_VERSION >= (20160603) |
| bdrv_register(&bdrv_iser); |
| #endif |
| } |
| |
| block_init(iscsi_block_init); |