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qemu-e2k/block/iscsi.c
Stefan Hajnoczi 826cc32423 aio-posix: split poll check from ready handler 
Adaptive polling measures the execution time of the polling check plus
handlers called when a polled event becomes ready. Handlers can take a
significant amount of time, making it look like polling was running for
a long time when in fact the event handler was running for a long time.

For example, on Linux the io_submit(2) syscall invoked when a virtio-blk
device's virtqueue becomes ready can take 10s of microseconds. This
can exceed the default polling interval (32 microseconds) and cause
adaptive polling to stop polling.

By excluding the handler's execution time from the polling check we make
the adaptive polling calculation more accurate. As a result, the event
loop now stays in polling mode where previously it would have fallen
back to file descriptor monitoring.

The following data was collected with virtio-blk num-queues=2
event_idx=off using an IOThread. Before:

168k IOPS, IOThread syscalls:

  9837.115 ( 0.020 ms): IO iothread1/620155 io_submit(ctx_id: 140512552468480, nr: 16, iocbpp: 0x7fcb9f937db0)    = 16
  9837.158 ( 0.002 ms): IO iothread1/620155 write(fd: 103, buf: 0x556a2ef71b88, count: 8)                         = 8
  9837.161 ( 0.001 ms): IO iothread1/620155 write(fd: 104, buf: 0x556a2ef71b88, count: 8)                         = 8
  9837.163 ( 0.001 ms): IO iothread1/620155 ppoll(ufds: 0x7fcb90002800, nfds: 4, tsp: 0x7fcb9f1342d0, sigsetsize: 8) = 3
  9837.164 ( 0.001 ms): IO iothread1/620155 read(fd: 107, buf: 0x7fcb9f939cc0, count: 512)                        = 8
  9837.174 ( 0.001 ms): IO iothread1/620155 read(fd: 105, buf: 0x7fcb9f939cc0, count: 512)                        = 8
  9837.176 ( 0.001 ms): IO iothread1/620155 read(fd: 106, buf: 0x7fcb9f939cc0, count: 512)                        = 8
  9837.209 ( 0.035 ms): IO iothread1/620155 io_submit(ctx_id: 140512552468480, nr: 32, iocbpp: 0x7fca7d0cebe0)    = 32

174k IOPS (+3.6%), IOThread syscalls:

  9809.566 ( 0.036 ms): IO iothread1/623061 io_submit(ctx_id: 140539805028352, nr: 32, iocbpp: 0x7fd0cdd62be0)    = 32
  9809.625 ( 0.001 ms): IO iothread1/623061 write(fd: 103, buf: 0x5647cfba5f58, count: 8)                         = 8
  9809.627 ( 0.002 ms): IO iothread1/623061 write(fd: 104, buf: 0x5647cfba5f58, count: 8)                         = 8
  9809.663 ( 0.036 ms): IO iothread1/623061 io_submit(ctx_id: 140539805028352, nr: 32, iocbpp: 0x7fd0d0388b50)    = 32

Notice that ppoll(2) and eventfd read(2) syscalls are eliminated because
the IOThread stays in polling mode instead of falling back to file
descriptor monitoring.

As usual, polling is not implemented on Windows so this patch ignores
the new io_poll_read() callback in aio-win32.c.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Message-id: 20211207132336.36627-2-stefanha@redhat.com

[Fixed up aio_set_event_notifier() calls in
tests/unit/test-fdmon-epoll.c added after this series was queued.
--Stefan]

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2022-01-12 17:09:39 +00:00

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/*
* 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-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/qdict.h"
#include "scsi/constants.h"
#include "qemu/iov.h"
#include "qemu/module.h"
#include "qemu/option.h"
#include "qemu/uuid.h"
#include "sysemu/replay.h"
#include "qapi/error.h"
#include "qapi/qapi-commands-machine.h"
#include "qapi/qmp/qdict.h"
#include "qapi/qmp/qstring.h"
#include "crypto/secret.h"
#include "scsi/utils.h"
#include "trace.h"
/* Conflict between scsi/utils.h and libiscsi! :( */
#define SCSI_XFER_NONE ISCSI_XFER_NONE
#include <iscsi/iscsi.h>
#define inline __attribute__((gnu_inline)) /* required for libiscsi v1.9.0 */
#include <iscsi/scsi-lowlevel.h>
#undef inline
#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;
struct scsi_inquiry_device_designator *dd;
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;
int status;
int64_t sector_num;
int nb_sectors;
int ret;
#ifdef __linux__
sg_io_hdr_t *ioh;
#endif
bool cancelled;
} 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
#ifdef __linux__
static void
iscsi_bh_cb(void *p)
{
IscsiAIOCB *acb = p;
qemu_bh_delete(acb->bh);
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);
}
#endif
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->err_code = 0;
iTask->task = task;
if (status != SCSI_STATUS_GOOD) {
iTask->err_code = -EIO;
if (iTask->retries++ < ISCSI_CMD_RETRIES) {
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;
} else if (status == SCSI_STATUS_CHECK_CONDITION) {
int error = iscsi_translate_sense(&task->sense);
if (error == EAGAIN) {
error_report("iSCSI CheckCondition: %s",
iscsi_get_error(iscsi));
iTask->do_retry = 1;
} else {
iTask->err_code = -error;
iTask->err_str = g_strdup(iscsi_get_error(iscsi));
}
}
}
}
if (iTask->co) {
replay_bh_schedule_oneshot_event(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,
};
}
#ifdef __linux__
/* Called (via iscsi_service) with QemuMutex held. */
static void
iscsi_abort_task_cb(struct iscsi_context *iscsi, int status, void *command_data,
void *private_data)
{
IscsiAIOCB *acb = private_data;
/* If the command callback hasn't been called yet, drop the task */
if (!acb->bh) {
/* Call iscsi_aio_ioctl_cb() with SCSI_STATUS_CANCELLED */
iscsi_scsi_cancel_task(iscsi, acb->task);
}
qemu_aio_unref(acb); /* acquired in iscsi_aio_cancel() */
}
static void
iscsi_aio_cancel(BlockAIOCB *blockacb)
{
IscsiAIOCB *acb = (IscsiAIOCB *)blockacb;
IscsiLun *iscsilun = acb->iscsilun;
WITH_QEMU_LOCK_GUARD(&iscsilun->mutex) {
/* If it was cancelled or completed already, our work is done here */
if (acb->cancelled || acb->status != -EINPROGRESS) {
return;
}
acb->cancelled = true;
qemu_aio_ref(acb); /* released in iscsi_abort_task_cb() */
/* send a task mgmt call to the target to cancel the task on the target */
if (iscsi_task_mgmt_abort_task_async(iscsilun->iscsi, acb->task,
iscsi_abort_task_cb, acb) < 0) {
qemu_aio_unref(acb); /* since iscsi_abort_task_cb() won't be called */
}
}
}
static const AIOCBInfo iscsi_aiocb_info = {
.aiocb_size = sizeof(IscsiAIOCB),
.cancel_async = iscsi_aio_cancel,
};
#endif
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, NULL,
iscsilun);
iscsilun->events = ev;
}
}
static void iscsi_timed_check_events(void *opaque)
{
IscsiLun *iscsilun = opaque;
WITH_QEMU_LOCK_GUARD(&iscsilun->mutex) {
/* 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, int64_t bytes,
IscsiLun *iscsilun)
{
if (offset % iscsilun->block_size || bytes % iscsilun->block_size) {
error_report("iSCSI misaligned request: "
"iscsilun->block_size %u, offset %" PRIi64
", bytes %" PRIi64,
iscsilun->block_size, offset, bytes);
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 void coroutine_fn iscsi_co_wait_for_task(IscsiTask *iTask,
IscsiLun *iscsilun)
{
while (!iTask->complete) {
iscsi_set_events(iscsilun);
qemu_mutex_unlock(&iscsilun->mutex);
qemu_coroutine_yield();
qemu_mutex_lock(&iscsilun->mutex);
}
}
static int coroutine_fn
iscsi_co_writev(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
iscsi_co_wait_for_task(&iTask, iscsilun);
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, max_bytes;
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;
max_bytes = (iscsilun->num_blocks - lba) * 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;
}
iscsi_co_wait_for_task(&iTask, iscsilun);
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 || lbas->num_descriptors == 0) {
ret = -EIO;
goto out_unlock;
}
lbasd = &lbas->descriptors[0];
if (lba != lbasd->lba) {
ret = -EIO;
goto out_unlock;
}
*pnum = MIN((int64_t) lbasd->num_blocks * iscsilun->block_size, max_bytes);
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);
}
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
iscsi_co_wait_for_task(&iTask, iscsilun);
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;
}
iscsi_co_wait_for_task(&iTask, iscsilun);
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;
if (status == SCSI_STATUS_CANCELLED) {
if (!acb->bh) {
acb->status = -ECANCELED;
iscsi_schedule_bh(acb);
}
return;
}
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 = MIN(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->ioh = buf;
acb->cancelled = false;
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,
int64_t 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;
}
/*
* We don't want to overflow list.num which is uint32_t.
* We rely on our max_pdiscard.
*/
assert(bytes / iscsilun->block_size <= UINT32_MAX);
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;
}
iscsi_co_wait_for_task(&iTask, iscsilun);
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,
int64_t bytes, BdrvRequestFlags flags)
{
IscsiLun *iscsilun = bs->opaque;
struct IscsiTask iTask;
uint64_t lba;
uint64_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) {
/*
* iscsi_writesame16_task num_blocks argument is uint32_t. We rely here
* on our max_pwrite_zeroes limit.
*/
assert(nb_blocks <= UINT32_MAX);
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 {
/*
* iscsi_writesame10_task num_blocks argument is uint16_t. We rely here
* on our max_pwrite_zeroes limit.
*/
assert(nb_blocks <= UINT16_MAX);
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;
}
iscsi_co_wait_for_task(&iTask, iscsilun);
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_LOCK_GUARD(&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.");
return;
}
timer_mod(iscsilun->nop_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL);
iscsi_set_events(iscsilun);
}
static void iscsi_readcapacity_sync(IscsiLun *iscsilun, Error **errp)
{
struct scsi_task *task = NULL;
struct scsi_readcapacity10 *rc10 = NULL;
struct scsi_readcapacity16 *rc16 = NULL;
int retries = ISCSI_CMD_RETRIES;
do {
if (task != NULL) {
scsi_free_scsi_task(task);
task = NULL;
}
switch (iscsilun->type) {
case TYPE_DISK:
task = iscsi_readcapacity16_sync(iscsilun->iscsi, iscsilun->lun);
if (task != NULL && task->status == SCSI_STATUS_GOOD) {
rc16 = scsi_datain_unmarshall(task);
if (rc16 == NULL) {
error_setg(errp, "iSCSI: Failed to unmarshall readcapacity16 data.");
} else {
iscsilun->block_size = rc16->block_length;
iscsilun->num_blocks = rc16->returned_lba + 1;
iscsilun->lbpme = !!rc16->lbpme;
iscsilun->lbprz = !!rc16->lbprz;
iscsilun->use_16_for_rw = (rc16->returned_lba > 0xffffffff);
}
break;
}
if (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION
&& task->sense.key == SCSI_SENSE_UNIT_ATTENTION) {
break;
}
/* Fall through and try READ CAPACITY(10) instead. */
case TYPE_ROM:
task = iscsi_readcapacity10_sync(iscsilun->iscsi, iscsilun->lun, 0, 0);
if (task != NULL && task->status == SCSI_STATUS_GOOD) {
rc10 = scsi_datain_unmarshall(task);
if (rc10 == NULL) {
error_setg(errp, "iSCSI: Failed to unmarshall readcapacity10 data.");
} else {
iscsilun->block_size = rc10->block_size;
if (rc10->lba == 0) {
/* blank disk loaded */
iscsilun->num_blocks = 0;
} else {
iscsilun->num_blocks = rc10->lba + 1;
}
}
}
break;
default:
return;
}
} while (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION
&& task->sense.key == SCSI_SENSE_UNIT_ATTENTION
&& retries-- > 0);
if (task == NULL || task->status != SCSI_STATUS_GOOD) {
error_setg(errp, "iSCSI: failed to send readcapacity10/16 command");
} else if (!iscsilun->block_size ||
iscsilun->block_size % BDRV_SECTOR_SIZE) {
error_setg(errp, "iSCSI: the target returned an invalid "
"block size of %d.", iscsilun->block_size);
}
if (task) {
scsi_free_scsi_task(task);
}
}
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, NULL);
iscsilun->events = 0;
if (iscsilun->nop_timer) {
timer_free(iscsilun->nop_timer);
iscsilun->nop_timer = NULL;
}
if (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,
},
{ /* end of list */ }
},
};
static void iscsi_save_designator(IscsiLun *lun,
struct scsi_inquiry_device_identification *inq_di)
{
struct scsi_inquiry_device_designator *desig, *copy = NULL;
for (desig = inq_di->designators; desig; desig = desig->next) {
if (desig->association ||
desig->designator_type > SCSI_DESIGNATOR_TYPE_NAA) {
continue;
}
/* NAA works better than T10 vendor ID based designator. */
if (!copy || copy->designator_type < desig->designator_type) {
copy = desig;
}
}
if (copy) {
lun->dd = g_new(struct scsi_inquiry_device_designator, 1);
*lun->dd = *copy;
lun->dd->next = NULL;
lun->dd->designator = g_malloc(copy->designator_length);
memcpy(lun->dd->designator, copy->designator, copy->designator_length);
}
}
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;
#if LIBISCSI_API_VERSION >= (20160603)
enum iscsi_transport_type transport;
#endif
int i, ret = 0, timeout = 0, lun;
opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
if (!qemu_opts_absorb_qdict(opts, options, errp)) {
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) {
warn_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) {
ret = bdrv_apply_auto_read_only(bs, "LUN is write protected", errp);
if (ret < 0) {
goto out;
}
flags &= ~BDRV_O_RDWR;
}
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;
struct scsi_inquiry_device_identification *inq_di;
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;
case SCSI_INQUIRY_PAGECODE_DEVICE_IDENTIFICATION:
inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,
SCSI_INQUIRY_PAGECODE_DEVICE_IDENTIFICATION,
(void **) &inq_di, errp);
if (inq_task == NULL) {
ret = -EINVAL;
goto out;
}
iscsi_save_designator(iscsilun, inq_di);
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, 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));
}
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);
if (iscsilun->dd) {
g_free(iscsilun->dd->designator);
g_free(iscsilun->dd);
}
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) {
bs->bl.max_pdiscard =
MIN_NON_ZERO(iscsilun->bl.max_unmap * iscsilun->block_size,
(uint64_t)UINT32_MAX * iscsilun->block_size);
bs->bl.pdiscard_alignment =
iscsilun->bl.opt_unmap_gran * iscsilun->block_size;
} else {
bs->bl.pdiscard_alignment = iscsilun->block_size;
}
bs->bl.max_pwrite_zeroes =
MIN_NON_ZERO(iscsilun->bl.max_ws_len * iscsilun->block_size,
max_xfer_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 coroutine_fn iscsi_co_truncate(BlockDriverState *bs, int64_t offset,
bool exact, PreallocMode prealloc,
BdrvRequestFlags flags, Error **errp)
{
IscsiLun *iscsilun = bs->opaque;
int64_t cur_length;
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;
}
cur_length = iscsi_getlength(bs);
if (offset != cur_length && exact) {
error_setg(errp, "Cannot resize iSCSI devices");
return -ENOTSUP;
} else if (offset > cur_length) {
error_setg(errp, "Cannot grow iSCSI devices");
return -EINVAL;
}
if (iscsilun->allocmap != NULL) {
iscsi_allocmap_init(iscsilun, bs->open_flags);
}
return 0;
}
static int iscsi_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
{
IscsiLun *iscsilun = bs->opaque;
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 int coroutine_fn iscsi_co_copy_range_from(BlockDriverState *bs,
BdrvChild *src,
int64_t src_offset,
BdrvChild *dst,
int64_t dst_offset,
int64_t bytes,
BdrvRequestFlags read_flags,
BdrvRequestFlags write_flags)
{
return bdrv_co_copy_range_to(src, src_offset, dst, dst_offset, bytes,
read_flags, write_flags);
}
static struct scsi_task *iscsi_xcopy_task(int param_len)
{
struct scsi_task *task;
task = g_new0(struct scsi_task, 1);
task->cdb[0] = EXTENDED_COPY;
task->cdb[10] = (param_len >> 24) & 0xFF;
task->cdb[11] = (param_len >> 16) & 0xFF;
task->cdb[12] = (param_len >> 8) & 0xFF;
task->cdb[13] = param_len & 0xFF;
task->cdb_size = 16;
task->xfer_dir = SCSI_XFER_WRITE;
task->expxferlen = param_len;
return task;
}
static void iscsi_populate_target_desc(unsigned char *desc, IscsiLun *lun)
{
struct scsi_inquiry_device_designator *dd = lun->dd;
memset(desc, 0, 32);
desc[0] = 0xE4; /* IDENT_DESCR_TGT_DESCR */
desc[4] = dd->code_set;
desc[5] = (dd->designator_type & 0xF)
| ((dd->association & 3) << 4);
desc[7] = dd->designator_length;
memcpy(desc + 8, dd->designator, MIN(dd->designator_length, 20));
desc[28] = 0;
desc[29] = (lun->block_size >> 16) & 0xFF;
desc[30] = (lun->block_size >> 8) & 0xFF;
desc[31] = lun->block_size & 0xFF;
}
static void iscsi_xcopy_desc_hdr(uint8_t *hdr, int dc, int cat, int src_index,
int dst_index)
{
hdr[0] = 0x02; /* BLK_TO_BLK_SEG_DESCR */
hdr[1] = ((dc << 1) | cat) & 0xFF;
hdr[2] = (XCOPY_BLK2BLK_SEG_DESC_SIZE >> 8) & 0xFF;
/* don't account for the first 4 bytes in descriptor header*/
hdr[3] = (XCOPY_BLK2BLK_SEG_DESC_SIZE - 4 /* SEG_DESC_SRC_INDEX_OFFSET */) & 0xFF;
hdr[4] = (src_index >> 8) & 0xFF;
hdr[5] = src_index & 0xFF;
hdr[6] = (dst_index >> 8) & 0xFF;
hdr[7] = dst_index & 0xFF;
}
static void iscsi_xcopy_populate_desc(uint8_t *desc, int dc, int cat,
int src_index, int dst_index, int num_blks,
uint64_t src_lba, uint64_t dst_lba)
{
iscsi_xcopy_desc_hdr(desc, dc, cat, src_index, dst_index);
/* The caller should verify the request size */
assert(num_blks < 65536);
desc[10] = (num_blks >> 8) & 0xFF;
desc[11] = num_blks & 0xFF;
desc[12] = (src_lba >> 56) & 0xFF;
desc[13] = (src_lba >> 48) & 0xFF;
desc[14] = (src_lba >> 40) & 0xFF;
desc[15] = (src_lba >> 32) & 0xFF;
desc[16] = (src_lba >> 24) & 0xFF;
desc[17] = (src_lba >> 16) & 0xFF;
desc[18] = (src_lba >> 8) & 0xFF;
desc[19] = src_lba & 0xFF;
desc[20] = (dst_lba >> 56) & 0xFF;
desc[21] = (dst_lba >> 48) & 0xFF;
desc[22] = (dst_lba >> 40) & 0xFF;
desc[23] = (dst_lba >> 32) & 0xFF;
desc[24] = (dst_lba >> 24) & 0xFF;
desc[25] = (dst_lba >> 16) & 0xFF;
desc[26] = (dst_lba >> 8) & 0xFF;
desc[27] = dst_lba & 0xFF;
}
static void iscsi_xcopy_populate_header(unsigned char *buf, int list_id, int str,
int list_id_usage, int prio,
int tgt_desc_len,
int seg_desc_len, int inline_data_len)
{
buf[0] = list_id;
buf[1] = ((str & 1) << 5) | ((list_id_usage & 3) << 3) | (prio & 7);
buf[2] = (tgt_desc_len >> 8) & 0xFF;
buf[3] = tgt_desc_len & 0xFF;
buf[8] = (seg_desc_len >> 24) & 0xFF;
buf[9] = (seg_desc_len >> 16) & 0xFF;
buf[10] = (seg_desc_len >> 8) & 0xFF;
buf[11] = seg_desc_len & 0xFF;
buf[12] = (inline_data_len >> 24) & 0xFF;
buf[13] = (inline_data_len >> 16) & 0xFF;
buf[14] = (inline_data_len >> 8) & 0xFF;
buf[15] = inline_data_len & 0xFF;
}
static void iscsi_xcopy_data(struct iscsi_data *data,
IscsiLun *src, int64_t src_lba,
IscsiLun *dst, int64_t dst_lba,
uint16_t num_blocks)
{
uint8_t *buf;
const int src_offset = XCOPY_DESC_OFFSET;
const int dst_offset = XCOPY_DESC_OFFSET + IDENT_DESCR_TGT_DESCR_SIZE;
const int seg_offset = dst_offset + IDENT_DESCR_TGT_DESCR_SIZE;
data->size = XCOPY_DESC_OFFSET +
IDENT_DESCR_TGT_DESCR_SIZE * 2 +
XCOPY_BLK2BLK_SEG_DESC_SIZE;
data->data = g_malloc0(data->size);
buf = data->data;
/* Initialise the parameter list header */
iscsi_xcopy_populate_header(buf, 1, 0, 2 /* LIST_ID_USAGE_DISCARD */,
0, 2 * IDENT_DESCR_TGT_DESCR_SIZE,
XCOPY_BLK2BLK_SEG_DESC_SIZE,
0);
/* Initialise CSCD list with one src + one dst descriptor */
iscsi_populate_target_desc(&buf[src_offset], src);
iscsi_populate_target_desc(&buf[dst_offset], dst);
/* Initialise one segment descriptor */
iscsi_xcopy_populate_desc(&buf[seg_offset], 0, 0, 0, 1, num_blocks,
src_lba, dst_lba);
}
static int coroutine_fn iscsi_co_copy_range_to(BlockDriverState *bs,
BdrvChild *src,
int64_t src_offset,
BdrvChild *dst,
int64_t dst_offset,
int64_t bytes,
BdrvRequestFlags read_flags,
BdrvRequestFlags write_flags)
{
IscsiLun *dst_lun = dst->bs->opaque;
IscsiLun *src_lun;
struct IscsiTask iscsi_task;
struct iscsi_data data;
int r = 0;
int block_size;
if (src->bs->drv->bdrv_co_copy_range_to != iscsi_co_copy_range_to) {
return -ENOTSUP;
}
src_lun = src->bs->opaque;
if (!src_lun->dd || !dst_lun->dd) {
return -ENOTSUP;
}
if (!is_byte_request_lun_aligned(dst_offset, bytes, dst_lun)) {
return -ENOTSUP;
}
if (!is_byte_request_lun_aligned(src_offset, bytes, src_lun)) {
return -ENOTSUP;
}
if (dst_lun->block_size != src_lun->block_size ||
!dst_lun->block_size) {
return -ENOTSUP;
}
block_size = dst_lun->block_size;
if (bytes / block_size > 65535) {
return -ENOTSUP;
}
iscsi_xcopy_data(&data,
src_lun, src_offset / block_size,
dst_lun, dst_offset / block_size,
bytes / block_size);
iscsi_co_init_iscsitask(dst_lun, &iscsi_task);
qemu_mutex_lock(&dst_lun->mutex);
iscsi_task.task = iscsi_xcopy_task(data.size);
retry:
if (iscsi_scsi_command_async(dst_lun->iscsi, dst_lun->lun,
iscsi_task.task, iscsi_co_generic_cb,
&data,
&iscsi_task) != 0) {
r = -EIO;
goto out_unlock;
}
iscsi_co_wait_for_task(&iscsi_task, dst_lun);
if (iscsi_task.do_retry) {
iscsi_task.complete = 0;
goto retry;
}
if (iscsi_task.status != SCSI_STATUS_GOOD) {
r = iscsi_task.err_code;
goto out_unlock;
}
out_unlock:
trace_iscsi_xcopy(src_lun, src_offset, dst_lun, dst_offset, bytes, r);
g_free(iscsi_task.task);
qemu_mutex_unlock(&dst_lun->mutex);
g_free(iscsi_task.err_str);
return r;
}
static const char *const iscsi_strong_runtime_opts[] = {
"transport",
"portal",
"target",
"user",
"password",
"password-secret",
"lun",
"initiator-name",
"header-digest",
NULL
};
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 = bdrv_co_create_opts_simple,
.create_opts = &bdrv_create_opts_simple,
.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_co_truncate = iscsi_co_truncate,
.bdrv_refresh_limits = iscsi_refresh_limits,
.bdrv_co_block_status = iscsi_co_block_status,
.bdrv_co_pdiscard = iscsi_co_pdiscard,
.bdrv_co_copy_range_from = iscsi_co_copy_range_from,
.bdrv_co_copy_range_to = iscsi_co_copy_range_to,
.bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes,
.bdrv_co_readv = iscsi_co_readv,
.bdrv_co_writev = iscsi_co_writev,
.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,
.strong_runtime_opts = iscsi_strong_runtime_opts,
};
#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 = bdrv_co_create_opts_simple,
.create_opts = &bdrv_create_opts_simple,
.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_co_truncate = iscsi_co_truncate,
.bdrv_refresh_limits = iscsi_refresh_limits,
.bdrv_co_block_status = iscsi_co_block_status,
.bdrv_co_pdiscard = iscsi_co_pdiscard,
.bdrv_co_copy_range_from = iscsi_co_copy_range_from,
.bdrv_co_copy_range_to = iscsi_co_copy_range_to,
.bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes,
.bdrv_co_readv = iscsi_co_readv,
.bdrv_co_writev = iscsi_co_writev,
.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,
.strong_runtime_opts = iscsi_strong_runtime_opts,
};
#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);
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