1738488e41
Since base device doesn't require VSS, FTL introduces a mechanism that will allow for recovering both the P2L and write pointer of open bands after a dirty shutdown. After writing 1MiB of data to a band, a 4KiB block describing the P2L will be persisted to cache device, effectively emulating VSS for the base device. Signed-off-by: Artur Paszkiewicz <artur.paszkiewicz@intel.com> Signed-off-by: Kozlowski Mateusz <mateusz.kozlowski@intel.com> Change-Id: Ic6be52dc09b237297a5cda3e752d6c038e98b70e Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/13367 Community-CI: Mellanox Build Bot Tested-by: SPDK CI Jenkins <sys_sgci@intel.com> Reviewed-by: Jim Harris <james.r.harris@intel.com> Reviewed-by: Ben Walker <benjamin.walker@intel.com>
57 lines
1.2 KiB
C
57 lines
1.2 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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*/
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#ifndef FTL_SB_CURRENT_H
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#define FTL_SB_CURRENT_H
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#include "spdk/uuid.h"
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#include "ftl_sb_common.h"
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#define FTL_METADATA_VERSION_4 4
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#define FTL_METADATA_VERSION_CURRENT FTL_METADATA_VERSION_4
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struct ftl_superblock {
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struct ftl_superblock_header header;
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struct spdk_uuid uuid;
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/* Current sequence number */
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uint64_t seq_id;
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/* Flag describing clean shutdown */
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uint64_t clean;
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/* Number of surfaced LBAs */
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uint64_t lba_cnt;
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/* Percentage of base device blocks not exposed to the user */
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uint64_t overprovisioning;
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/* Maximum IO depth per band relocate */
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uint64_t max_reloc_qdepth;
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/* Reserved fields */
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uint64_t reserved;
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bool reserved3;
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uint32_t reserved2;
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/* Last L2P checkpoint +1 (i.e. min_seq_id, 0:no ckpt) */
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uint64_t ckpt_seq_id;
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struct ftl_superblock_gc_info gc_info;
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struct ftl_superblock_md_region md_layout_head;
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};
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SPDK_STATIC_ASSERT(offsetof(struct ftl_superblock, header) == 0,
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"Invalid placement of header");
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SPDK_STATIC_ASSERT(FTL_SUPERBLOCK_SIZE >= sizeof(struct ftl_superblock),
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"FTL SB metadata size is invalid");
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#endif /* FTL_SB_CURRENT_H */
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