2e7a7fe530
Writing to unallocated cluster triggers copy-on-write sequence. If this cluster is backed by zeroes device we can skip the copy part. For a simple thin provisioned volume copy this shortcut is already implemented because `blob->parent_id == SPDK_BLOBID_INVALID`. But this will not work for thin provisioned volumes created from snapshot. In this case we need to traverse the whole stack of underlying `spdk_bs_dev` devices for specific cluster to check if it is zeroes backed. This patch adds `is_zeroes` operation to `spdk_bs_dev`. For zeroes device it always returns 'true', for real bdev (`blob_bs_dev`) always returns false, for another layer of `blob_bs_dev` does lba conversion and forwards to backing device. In blobstore's cluster copy flow we check if cluster is backed by zeroes device and skip copy part if it is. Signed-off-by: Evgeniy Kochetov <evgeniik@nvidia.com> Change-Id: I640773ac78f8f466b96e96a34c3a6c3c91f87dab Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/13446 Tested-by: SPDK CI Jenkins <sys_sgci@intel.com> Community-CI: Mellanox Build Bot Community-CI: Broadcom CI <spdk-ci.pdl@broadcom.com> Reviewed-by: Shuhei Matsumoto <smatsumoto@nvidia.com> Reviewed-by: Aleksey Marchuk <alexeymar@nvidia.com> Reviewed-by: Jim Harris <james.r.harris@intel.com> Reviewed-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
149 lines
3.8 KiB
C
149 lines
3.8 KiB
C
/* SPDX-License-Identifier: BSD-3-Clause
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* Copyright (c) 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 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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};
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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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