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Re: [PATCH v8 10/10] block/iscsi: add persistent reservation in/out driv
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From: |
Stefan Hajnoczi |
|
Subject: |
Re: [PATCH v8 10/10] block/iscsi: add persistent reservation in/out driver |
|
Date: |
Thu, 11 Jul 2024 15:04:55 +0200 |
On Tue, Jul 09, 2024 at 10:47:06AM +0800, Changqi Lu wrote:
> 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.123@bytedance.com>
> Signed-off-by: zhenwei pi <pizhenwei@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);
buf is declared g_autofree, so this explicit g_free() call causes a
double-free. There is no need to call g_free().
> + 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);
Double-free. This line can be removed.
> + 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
>
signature.asc
Description: PGP signature
- [PATCH v8 04/10] scsi/util: add helper functions for persistent reservation types conversion, (continued)
- [PATCH v8 04/10] scsi/util: add helper functions for persistent reservation types conversion, Changqi Lu, 2024/07/08
- [PATCH v8 07/10] hw/nvme: add helper functions for converting reservation types, Changqi Lu, 2024/07/08
- [PATCH v8 06/10] block/nvme: add reservation command protocol constants, Changqi Lu, 2024/07/08
- [PATCH v8 05/10] hw/scsi: add persistent reservation in/out api for scsi device, Changqi Lu, 2024/07/08
- [PATCH v8 08/10] hw/nvme: enable ONCS and rescap function, Changqi Lu, 2024/07/08
- [PATCH v8 09/10] hw/nvme: add reservation protocal command, Changqi Lu, 2024/07/08
- [PATCH v8 10/10] block/iscsi: add persistent reservation in/out driver, Changqi Lu, 2024/07/08