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ftl: Change metadata to use structure packing

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Don't rely on compiler for metadata packing to 4KiB size and add
reserved fields manually. For compatibility reasons against metadata
relying on automatic padding the reserved fields are also added in-between
existing fields as needed.

Signed-off-by: Kozlowski Mateusz <mateusz.kozlowski@intel.com>
Change-Id: I5e342d5bf5948c213d455590d09597ae120b3c62
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/14307
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
This commit is contained in:
Kozlowski Mateusz 2022-09-01 14:15:47 +02:00 committed by Jim Harris
parent c332181331
commit 920c1cca18
4 changed files with 23 additions and 12 deletions
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8
lib/ftl/ftl_band.h
View File

@ -64,6 +64,9 @@ struct ftl_band_md {
/* nv_cache p2l md region associated with band */
enum ftl_layout_region_type p2l_md_region;
/* Reserved */
uint8_t reserved[4];
/* Sequence ID when band was opened */
uint64_t seq;
@ -78,7 +81,10 @@ struct ftl_band_md {
/* CRC32 checksum of the associated P2L map when band is in closed state */
uint32_t p2l_map_checksum;
} __attribute__((aligned(FTL_BLOCK_SIZE)));
/* Reserved */
uint8_t reserved2[4028];
} __attribute__((packed));
SPDK_STATIC_ASSERT(sizeof(struct ftl_band_md) == FTL_BLOCK_SIZE, "Incorrect metadata size");

5
lib/ftl/ftl_nv_cache.h
View File

@ -83,7 +83,10 @@ struct ftl_nv_cache_chunk_md {
/* CRC32 checksum of the associated P2L map when chunk is in closed state */
uint32_t p2l_map_checksum;
} __attribute__((aligned(FTL_BLOCK_SIZE)));
/* Reserved */
uint8_t reserved[4052];
} __attribute__((packed));
#define FTL_NV_CACHE_CHUNK_MD_SIZE sizeof(struct ftl_nv_cache_chunk_md)
SPDK_STATIC_ASSERT(FTL_NV_CACHE_CHUNK_MD_SIZE == FTL_BLOCK_SIZE,

12
lib/ftl/ftl_sb_common.h
View File

@ -33,13 +33,17 @@ struct ftl_superblock_gc_info {
uint64_t band_phys_id;
/* May be updating multiple fields at the same time, clearing/setting this marks the transaction */
uint64_t is_valid;
};
} __attribute__((packed));
SPDK_STATIC_ASSERT(sizeof(struct ftl_superblock_gc_info) == 32,
"ftl_superblock_gc_info incorrect size");
struct ftl_superblock_header {
uint64_t magic;
uint64_t crc;
uint64_t version;
};
} __attribute__((packed));
SPDK_STATIC_ASSERT(sizeof(struct ftl_superblock_header) == 24,
"ftl_superblock_header incorrect size");
struct ftl_superblock_md_region {
uint32_t type;
@ -47,7 +51,9 @@ struct ftl_superblock_md_region {
uint64_t blk_offs;
uint64_t blk_sz;
ftl_df_obj_id df_next;
};
} __attribute__((packed));
SPDK_STATIC_ASSERT(sizeof(struct ftl_superblock_md_region) == 32,
"ftl_superblock_md_region incorrect size");
struct ftl_superblock_shm {
/* SHM initialization completed */

10
lib/ftl/ftl_sb_current.h
View File

@ -32,12 +32,8 @@ struct ftl_superblock {
/* Maximum IO depth per band relocate */
uint64_t max_reloc_qdepth;
/* Reserved fields */
uint64_t reserved;
bool reserved3;
uint32_t reserved2;
/* Reserved field */
uint8_t reserved3[16];
/* Last L2P checkpoint +1 (i.e. min_seq_id, 0:no ckpt) */
uint64_t ckpt_seq_id;
@ -45,7 +41,7 @@ struct ftl_superblock {
struct ftl_superblock_gc_info gc_info;
struct ftl_superblock_md_region md_layout_head;
};
} __attribute__((packed));
SPDK_STATIC_ASSERT(offsetof(struct ftl_superblock, header) == 0,
"Invalid placement of header");