9e843fdbd1
New `translate_lba` operation allows to translate blob lba to lba on the underlying bdev. It recurses down the whole chain of bs_dev's. The operation may fail to do the translation when blob lba is not backed by the real bdev. For example, when we eventually hit zeroes device in the chain. This operation is used in the next commit to get source LBA for copy operation. Signed-off-by: Evgeniy Kochetov <evgeniik@nvidia.com> Change-Id: I89c2d03d1982d66b9137a3a3653a98c361984fab Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/14528 Tested-by: SPDK CI Jenkins <sys_sgci@intel.com> Reviewed-by: Jim Harris <james.r.harris@intel.com> Reviewed-by: Shuhei Matsumoto <smatsumoto@nvidia.com> Reviewed-by: Aleksey Marchuk <alexeymar@nvidia.com>
156 lines
3.9 KiB
C
156 lines
3.9 KiB
C
/* SPDX-License-Identifier: BSD-3-Clause
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* Copyright (C) 2018 Intel Corporation.
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* All rights reserved.
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* Copyright (c) 2022 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
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*/
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#include "spdk/stdinc.h"
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#include "spdk/blob.h"
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#include "spdk/dma.h"
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#include "blobstore.h"
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static void
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zeroes_destroy(struct spdk_bs_dev *bs_dev)
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{
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return;
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}
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static void
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zeroes_read(struct spdk_bs_dev *dev, struct spdk_io_channel *channel, void *payload,
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uint64_t lba, uint32_t lba_count, struct spdk_bs_dev_cb_args *cb_args)
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{
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memset(payload, 0, dev->blocklen * lba_count);
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cb_args->cb_fn(cb_args->channel, cb_args->cb_arg, 0);
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}
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static void
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zeroes_write(struct spdk_bs_dev *dev, struct spdk_io_channel *channel, void *payload,
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uint64_t lba, uint32_t lba_count,
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struct spdk_bs_dev_cb_args *cb_args)
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{
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cb_args->cb_fn(cb_args->channel, cb_args->cb_arg, -EPERM);
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assert(false);
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}
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static void
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zeroes_readv(struct spdk_bs_dev *dev, struct spdk_io_channel *channel,
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struct iovec *iov, int iovcnt,
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uint64_t lba, uint32_t lba_count, struct spdk_bs_dev_cb_args *cb_args)
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{
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int i;
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for (i = 0; i < iovcnt; i++) {
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memset(iov[i].iov_base, 0, iov[i].iov_len);
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}
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cb_args->cb_fn(cb_args->channel, cb_args->cb_arg, 0);
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}
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static void
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zeroes_writev(struct spdk_bs_dev *dev, struct spdk_io_channel *channel,
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struct iovec *iov, int iovcnt,
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uint64_t lba, uint32_t lba_count,
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struct spdk_bs_dev_cb_args *cb_args)
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{
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cb_args->cb_fn(cb_args->channel, cb_args->cb_arg, -EPERM);
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assert(false);
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}
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static void
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_read_memory_domain_memzero_done(void *ctx, int rc)
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{
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struct spdk_bs_dev_cb_args *cb_args = (struct spdk_bs_dev_cb_args *)ctx;
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cb_args->cb_fn(cb_args->channel, cb_args->cb_arg, rc);
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}
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static void
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zeroes_readv_ext(struct spdk_bs_dev *dev, struct spdk_io_channel *channel,
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struct iovec *iov, int iovcnt,
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uint64_t lba, uint32_t lba_count, struct spdk_bs_dev_cb_args *cb_args,
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struct spdk_blob_ext_io_opts *ext_io_opts)
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{
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int i, rc;
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if (ext_io_opts->memory_domain) {
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rc = spdk_memory_domain_memzero(ext_io_opts->memory_domain, ext_io_opts->memory_domain_ctx, iov,
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iovcnt, _read_memory_domain_memzero_done, cb_args);
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if (rc) {
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cb_args->cb_fn(cb_args->channel, cb_args->cb_arg, rc);
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}
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return;
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}
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for (i = 0; i < iovcnt; i++) {
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memset(iov[i].iov_base, 0, iov[i].iov_len);
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}
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cb_args->cb_fn(cb_args->channel, cb_args->cb_arg, 0);
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}
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static void
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zeroes_writev_ext(struct spdk_bs_dev *dev, struct spdk_io_channel *channel,
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struct iovec *iov, int iovcnt,
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uint64_t lba, uint32_t lba_count,
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struct spdk_bs_dev_cb_args *cb_args,
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struct spdk_blob_ext_io_opts *ext_io_opts)
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{
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cb_args->cb_fn(cb_args->channel, cb_args->cb_arg, -EPERM);
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assert(false);
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}
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static void
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zeroes_write_zeroes(struct spdk_bs_dev *dev, struct spdk_io_channel *channel,
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uint64_t lba, uint64_t lba_count,
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struct spdk_bs_dev_cb_args *cb_args)
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{
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cb_args->cb_fn(cb_args->channel, cb_args->cb_arg, -EPERM);
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assert(false);
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}
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static void
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zeroes_unmap(struct spdk_bs_dev *dev, struct spdk_io_channel *channel,
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uint64_t lba, uint64_t lba_count,
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struct spdk_bs_dev_cb_args *cb_args)
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{
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cb_args->cb_fn(cb_args->channel, cb_args->cb_arg, -EPERM);
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assert(false);
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}
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static bool
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zeroes_is_zeroes(struct spdk_bs_dev *dev, uint64_t lba, uint64_t lba_count)
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{
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return true;
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}
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static bool
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zeroes_translate_lba(struct spdk_bs_dev *dev, uint64_t lba, uint64_t *base_lba)
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{
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return false;
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}
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static struct spdk_bs_dev g_zeroes_bs_dev = {
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.blockcnt = UINT64_MAX,
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.blocklen = 512,
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.create_channel = NULL,
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.destroy_channel = NULL,
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.destroy = zeroes_destroy,
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.read = zeroes_read,
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.write = zeroes_write,
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.readv = zeroes_readv,
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.writev = zeroes_writev,
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.readv_ext = zeroes_readv_ext,
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.writev_ext = zeroes_writev_ext,
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.write_zeroes = zeroes_write_zeroes,
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.unmap = zeroes_unmap,
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.is_zeroes = zeroes_is_zeroes,
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.translate_lba = zeroes_translate_lba,
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};
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struct spdk_bs_dev *
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bs_create_zeroes_dev(void)
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{
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return &g_zeroes_bs_dev;
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}
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