On 08/25, Daniel Rosenberg wrote:
> This converts f2fs_nat_block and f2fs_sit_block to be variable length
> arrays. This does not change the way they are accessed, but removes a
> misleading statment that these sizes are fixed, as opposed to deriving
> from F2FS_BLKSIZE
>
> Signed-off-by: Daniel Rosenberg <dro...@google.com>
> ---
> include/f2fs_fs.h | 20 ++++++++++++++------
> 1 file changed, 14 insertions(+), 6 deletions(-)
>
> diff --git a/include/f2fs_fs.h b/include/f2fs_fs.h
> index 13a1c14..b2d479f 100644
> --- a/include/f2fs_fs.h
> +++ b/include/f2fs_fs.h
> @@ -1119,11 +1119,9 @@ struct f2fs_nat_entry {
> static_assert(sizeof(struct f2fs_nat_entry) == 9, "");
>
> struct f2fs_nat_block {
> - struct f2fs_nat_entry entries[NAT_ENTRY_PER_BLOCK];
> + struct f2fs_nat_entry entries[0]; /* NAT_ENTRY_PER_BLOCK */
> };
>
> -static_assert(sizeof(struct f2fs_nat_block) == F2FS_BLKSIZE - (F2FS_BLKSIZE
> % 9), "");
> -
> /*
> * For SIT entries
> *
> @@ -1169,12 +1167,14 @@ struct f2fs_sit_entry {
>
> static_assert(sizeof(struct f2fs_sit_entry) == 74, "");
>
> +/*
> + * On disk layout is:
> + * struct f2fs_sit_entry entries[SIT_ENTRY_PER_BLOCK];
> + */
> struct f2fs_sit_block {
> - struct f2fs_sit_entry entries[SIT_ENTRY_PER_BLOCK];
> + struct f2fs_sit_entry entries[0];
> };
>
> -static_assert(sizeof(struct f2fs_sit_block) == F2FS_BLKSIZE - (F2FS_BLKSIZE
> % 74), "");
> -
> /*
> * For segment summary
> *
> @@ -1995,6 +1995,14 @@ static inline void check_block_struct_sizes(void)
>
> /* Check Indirect Block Size */
> assert(NIDS_PER_BLOCK * sizeof(__le32) + sizeof(struct node_footer) ==
> F2FS_BLKSIZE);
> +
> + /* Check NAT Block Size */
> + assert((NAT_ENTRY_PER_BLOCK + 1) * sizeof(struct f2fs_nat_entry) >
> F2FS_BLKSIZE);
> + assert(NAT_ENTRY_PER_BLOCK * sizeof(struct f2fs_nat_entry) <=
> F2FS_BLKSIZE);
> +
> + /* Check SIT Block Size */
> + assert((SIT_ENTRY_PER_BLOCK + 1) * sizeof(struct f2fs_nat_entry) >
> F2FS_BLKSIZE);
sizeof(struct f2fs_sit_entry)?
> + assert(SIT_ENTRY_PER_BLOCK * sizeof(struct f2fs_sit_entry) <=
> F2FS_BLKSIZE);
> }
>
> #endif /*__F2FS_FS_H */
> --
> 2.42.0.rc2.253.gd59a3bf2b4-goog
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