Add persistent reservation in/out operations for iscsi driver.
The following methods are implemented: bdrv_co_pr_read_keys,
bdrv_co_pr_read_reservation, bdrv_co_pr_register, bdrv_co_pr_reserve,
bdrv_co_pr_release, bdrv_co_pr_clear and bdrv_co_pr_preempt.
Signed-off-by: Changqi Lu <luchangqi....@bytedance.com>
Signed-off-by: zhenwei pi <pizhen...@bytedance.com>
---
block/iscsi.c | 425 ++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 425 insertions(+)
diff --git a/block/iscsi.c b/block/iscsi.c
index 2ff14b7472..ba51f6d016 100644
--- a/block/iscsi.c
+++ b/block/iscsi.c
@@ -96,6 +96,7 @@ typedef struct IscsiLun {
unsigned long *allocmap_valid;
long allocmap_size;
int cluster_size;
+ uint8_t pr_cap;
bool use_16_for_rw;
bool write_protected;
bool lbpme;
@@ -280,6 +281,10 @@ iscsi_co_generic_cb(struct iscsi_context *iscsi, int
status,
iTask->err_code = -error;
iTask->err_str = g_strdup(iscsi_get_error(iscsi));
}
+ } else if (status == SCSI_STATUS_RESERVATION_CONFLICT) {
+ iTask->err_code = -EBADE;
+ error_report("iSCSI Persistent Reservation Conflict: %s",
+ iscsi_get_error(iscsi));
}
}
}
@@ -1792,6 +1797,50 @@ static void iscsi_save_designator(IscsiLun *lun,
}
}
+/*
+ * Ensure iscsi_open() must succeed, weather or not the target
+ * implement SCSI_PR_IN_REPORT_CAPABILITIES.
+ */
+static void iscsi_get_pr_cap_sync(IscsiLun *iscsilun)
+{
+ struct scsi_task *task = NULL;
+ struct scsi_persistent_reserve_in_report_capabilities *rc = NULL;
+ int retries = ISCSI_CMD_RETRIES;
+ int xferlen = sizeof(struct
scsi_persistent_reserve_in_report_capabilities);
+
+ do {
+ if (task != NULL) {
+ scsi_free_scsi_task(task);
+ task = NULL;
+ }
+
+ task = iscsi_persistent_reserve_in_sync(iscsilun->iscsi,
+ iscsilun->lun, SCSI_PR_IN_REPORT_CAPABILITIES, xferlen);
+ if (task != NULL && task->status == SCSI_STATUS_GOOD) {
+ rc = scsi_datain_unmarshall(task);
+ if (rc == NULL) {
+ error_report("iSCSI: Failed to unmarshall "
+ "report capabilities data.");
+ } else {
+ iscsilun->pr_cap =
+ scsi_pr_cap_to_block(rc->persistent_reservation_type_mask);
+ iscsilun->pr_cap |= (rc->ptpl_a) ? BLK_PR_CAP_PTPL : 0;
+ }
+ break;
+ }
+ } while (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION
+ && task->sense.key == SCSI_SENSE_UNIT_ATTENTION
+ && retries-- > 0);
+
+ if (task == NULL || task->status != SCSI_STATUS_GOOD) {
+ error_report("iSCSI: failed to send report capabilities command.");
+ }
+
+ if (task) {
+ scsi_free_scsi_task(task);
+ }
+}
+
static int iscsi_open(BlockDriverState *bs, QDict *options, int flags,
Error **errp)
{
@@ -2024,6 +2073,7 @@ static int iscsi_open(BlockDriverState *bs, QDict
*options, int flags,
bs->supported_zero_flags = BDRV_REQ_MAY_UNMAP;
}
+ iscsi_get_pr_cap_sync(iscsilun);
out:
qemu_opts_del(opts);
g_free(initiator_name);
@@ -2110,6 +2160,8 @@ static void iscsi_refresh_limits(BlockDriverState *bs,
Error **errp)
bs->bl.opt_transfer = pow2floor(iscsilun->bl.opt_xfer_len *
iscsilun->block_size);
}
+
+ bs->bl.pr_cap = iscsilun->pr_cap;
}
/* Note that this will not re-establish a connection with an iSCSI target - it
@@ -2408,6 +2460,371 @@ out_unlock:
return r;
}
+static int coroutine_fn
+iscsi_co_pr_read_keys(BlockDriverState *bs, uint32_t *generation,
+ uint32_t num_keys, uint64_t *keys)
+{
+ IscsiLun *iscsilun = bs->opaque;
+ QEMUIOVector qiov;
+ struct IscsiTask iTask;
+ int xferlen = sizeof(struct scsi_persistent_reserve_in_read_keys) +
+ sizeof(uint64_t) * num_keys;
+ g_autofree uint8_t *buf = g_malloc0(xferlen);
+ int32_t num_collect_keys = 0;
+ int r = 0;
+
+ qemu_iovec_init_buf(&qiov, buf, xferlen);
+ iscsi_co_init_iscsitask(iscsilun, &iTask);
+ qemu_mutex_lock(&iscsilun->mutex);
+retry:
+ iTask.task = iscsi_persistent_reserve_in_task(iscsilun->iscsi,
+ iscsilun->lun, SCSI_PR_IN_READ_KEYS, xferlen,
+ iscsi_co_generic_cb, &iTask);
+
+ if (iTask.task == NULL) {
+ qemu_mutex_unlock(&iscsilun->mutex);
+ return -ENOMEM;
+ }
+
+ scsi_task_set_iov_in(iTask.task, (struct scsi_iovec *)qiov.iov, qiov.niov);
+ 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 PERSISTENT_RESERVE_IN failed: %s", iTask.err_str);
+ r = iTask.err_code;
+ goto out;
+ }
+
+ memcpy(generation, &buf[0], 4);
+ *generation = be32_to_cpu(*generation);
+ memcpy(&num_collect_keys, &buf[4], 4);
+ num_collect_keys = be32_to_cpu(num_collect_keys) / sizeof(uint64_t);
+ if (num_collect_keys > num_keys) {
+ r = -EINVAL;
+ goto out;
+ }
+
+ for (int i = 0; i < num_collect_keys; i++) {
+ memcpy(&keys[i], &buf[8 + i * 8], 8);
+ keys[i] = be64_to_cpu(keys[i]);
+ }
+ r = num_collect_keys;
+
+out:
+ qemu_mutex_unlock(&iscsilun->mutex);
+ g_free(iTask.err_str);
+ g_free(buf);
+ return r;
+}
+
+static int coroutine_fn
+iscsi_co_pr_read_reservation(BlockDriverState *bs, uint32_t *generation,
+ uint64_t *key, BlockPrType *type)
+{
+ IscsiLun *iscsilun = bs->opaque;
+ QEMUIOVector qiov;
+ struct IscsiTask iTask;
+ int xferlen = sizeof(struct scsi_persistent_reserve_in_read_reservation);
+ g_autofree uint8_t *buf = g_malloc0(xferlen);
+ uint8_t scope_type = 0;
+ int32_t num_collect_keys = 0;
+ int r = 0;
+
+ qemu_iovec_init_buf(&qiov, buf, xferlen);
+ iscsi_co_init_iscsitask(iscsilun, &iTask);
+ qemu_mutex_lock(&iscsilun->mutex);
+retry:
+ iTask.task = iscsi_persistent_reserve_in_task(iscsilun->iscsi,
+ iscsilun->lun, SCSI_PR_IN_READ_RESERVATION,
+ xferlen, iscsi_co_generic_cb, &iTask);
+
+ if (iTask.task == NULL) {
+ qemu_mutex_unlock(&iscsilun->mutex);
+ return -ENOMEM;
+ }
+
+ scsi_task_set_iov_in(iTask.task, (struct scsi_iovec *)qiov.iov, qiov.niov);
+ 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 PERSISTENT_RESERVE_IN failed: %s", iTask.err_str);
+ r = iTask.err_code;
+ goto out;
+ }
+
+ memcpy(generation, &buf[0], 4);
+ *generation = be32_to_cpu(*generation);
+ memcpy(key, &buf[8], 8);
+ *key = be64_to_cpu(*key);
+ memcpy(&scope_type, &buf[21], 1);
+ *type = scsi_pr_type_to_block(scope_type & 0xf);
+ memcpy(&num_collect_keys, &buf[4], 4);
+ r = be32_to_cpu(num_collect_keys) / sizeof(uint64_t);
+out:
+ qemu_mutex_unlock(&iscsilun->mutex);
+ g_free(iTask.err_str);
+ g_free(buf);
+ return r;
+}
+
+static int coroutine_fn
+iscsi_co_pr_register(BlockDriverState *bs, uint64_t old_key,
+ uint64_t new_key, BlockPrType type,
+ bool ptpl, bool ignore_key)
+{
+ IscsiLun *iscsilun = bs->opaque;
+ struct IscsiTask iTask;
+ struct scsi_persistent_reserve_out_basic basic;
+ SCSIPrOutAction action = ignore_key ? SCSI_PR_OUT_REG_AND_IGNORE_KEY :
+ SCSI_PR_OUT_REGISTER;
+ int r = 0;
+
+ basic.reservation_key = old_key;
+ basic.service_action_reservation_key = new_key;
+ basic.aptpl = ptpl ? 1 : 0;
+
+ iscsi_co_init_iscsitask(iscsilun, &iTask);
+ qemu_mutex_lock(&iscsilun->mutex);
+retry:
+ iTask.task = iscsi_persistent_reserve_out_task(iscsilun->iscsi,
+ iscsilun->lun, action, 0, block_pr_type_to_scsi(type),
+ &basic, 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.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 PERSISTENT_RESERVE_OUT failed: %s", 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_pr_reserve(BlockDriverState *bs, uint64_t key, BlockPrType type)
+{
+ IscsiLun *iscsilun = bs->opaque;
+ struct IscsiTask iTask;
+ struct scsi_persistent_reserve_out_basic basic;
+ int r = 0;
+
+ basic.reservation_key = key;
+ iscsi_co_init_iscsitask(iscsilun, &iTask);
+ qemu_mutex_lock(&iscsilun->mutex);
+retry:
+ iTask.task = iscsi_persistent_reserve_out_task(iscsilun->iscsi,
+ iscsilun->lun, SCSI_PR_OUT_RESERVE, 0,
+ block_pr_type_to_scsi(type), &basic,
+ 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.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 PERSISTENT_RESERVE_OUT failed: %s", 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_pr_release(BlockDriverState *bs, uint64_t key, BlockPrType type)
+{
+ IscsiLun *iscsilun = bs->opaque;
+ struct IscsiTask iTask;
+ struct scsi_persistent_reserve_out_basic basic;
+ int r = 0;
+
+ basic.reservation_key = key;
+ iscsi_co_init_iscsitask(iscsilun, &iTask);
+ qemu_mutex_lock(&iscsilun->mutex);
+retry:
+ iTask.task = iscsi_persistent_reserve_out_task(iscsilun->iscsi,
+ iscsilun->lun, SCSI_PR_OUT_RELEASE, 0,
+ block_pr_type_to_scsi(type), &basic,
+ 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.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 PERSISTENT_RESERVE_OUT failed: %s", 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_pr_clear(BlockDriverState *bs, uint64_t key)
+{
+ IscsiLun *iscsilun = bs->opaque;
+ struct IscsiTask iTask;
+ struct scsi_persistent_reserve_out_basic basic;
+ int r = 0;
+
+ basic.reservation_key = key;
+ iscsi_co_init_iscsitask(iscsilun, &iTask);
+ qemu_mutex_lock(&iscsilun->mutex);
+retry:
+ iTask.task = iscsi_persistent_reserve_out_task(iscsilun->iscsi,
+ iscsilun->lun, SCSI_PR_OUT_CLEAR, 0, 0, &basic,
+ 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.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 PERSISTENT_RESERVE_OUT failed: %s", 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_pr_preempt(BlockDriverState *bs, uint64_t old_key,
+ uint64_t new_key, BlockPrType type, bool abort)
+{
+ IscsiLun *iscsilun = bs->opaque;
+ struct IscsiTask iTask;
+ struct scsi_persistent_reserve_out_basic basic;
+ SCSIPrOutAction action = abort ? SCSI_PR_OUT_PREEMPT_AND_ABORT :
+ SCSI_PR_OUT_PREEMPT;
+ int r = 0;
+
+ basic.reservation_key = old_key;
+ basic.service_action_reservation_key = new_key;
+
+ iscsi_co_init_iscsitask(iscsilun, &iTask);
+ qemu_mutex_lock(&iscsilun->mutex);
+retry:
+ iTask.task = iscsi_persistent_reserve_out_task(iscsilun->iscsi,
+ iscsilun->lun, action, 0, block_pr_type_to_scsi(type),
+ &basic, 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.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 PERSISTENT_RESERVE_OUT failed: %s", iTask.err_str);
+ r = iTask.err_code;
+ }
+
+ qemu_mutex_unlock(&iscsilun->mutex);
+
+ g_free(iTask.err_str);
+ return r;
+}
+
static const char *const iscsi_strong_runtime_opts[] = {
"transport",
@@ -2451,6 +2868,14 @@ static BlockDriver bdrv_iscsi = {
.bdrv_co_writev = iscsi_co_writev,
.bdrv_co_flush_to_disk = iscsi_co_flush,
+ .bdrv_co_pr_read_keys = iscsi_co_pr_read_keys,
+ .bdrv_co_pr_read_reservation = iscsi_co_pr_read_reservation,
+ .bdrv_co_pr_register = iscsi_co_pr_register,
+ .bdrv_co_pr_reserve = iscsi_co_pr_reserve,
+ .bdrv_co_pr_release = iscsi_co_pr_release,
+ .bdrv_co_pr_clear = iscsi_co_pr_clear,
+ .bdrv_co_pr_preempt = iscsi_co_pr_preempt,
+
#ifdef __linux__
.bdrv_aio_ioctl = iscsi_aio_ioctl,
#endif
--
2.20.1
