linux-ext4 - Re: [RFCv1 05/72] badblocks: Add badblocks merge logic

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Date:   Fri, 18 Nov 2022 07:31:17 -0600
From:   Andreas Dilger <adilger@...ger.ca>
To:     "Ritesh Harjani (IBM)" <ritesh.list@...il.com>
Cc:     Theodore Ts'o <tytso@....edu>, linux-ext4@...r.kernel.org,
        Harshad Shirwadkar <harshadshirwadkar@...il.com>,
        Wang Shilong <wshilong@....com>,
        Andreas Dilger <adilger.kernel@...ger.ca>, Li Xi <lixi@....com>
Subject: Re: [RFCv1 05/72] badblocks: Add badblocks merge logic

On Nov 7, 2022, at 06:22, Ritesh Harjani (IBM) <ritesh.list@...il.com> wrote:
> 
> From: Wang Shilong <wshilong@....com>
> 
> Add badblocks merge logic
> 
> Signed-off-by: Wang Shilong <wshilong@....com>
> Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@...il.com>

Reviewed-by: Andreas Dilger <adilger@...ger.ca>

> ---
> lib/ext2fs/badblocks.c | 75 ++++++++++++++++++++++++++++++++++++++++++
> lib/ext2fs/ext2fs.h    |  2 ++
> 2 files changed, 77 insertions(+)
> 
> diff --git a/lib/ext2fs/badblocks.c b/lib/ext2fs/badblocks.c
> index 345168e0..36794e69 100644
> --- a/lib/ext2fs/badblocks.c
> +++ b/lib/ext2fs/badblocks.c
> @@ -56,6 +56,74 @@ static errcode_t make_u32_list(int size, int num, __u32 *list,
>    return 0;
> }
> 
> +static inline int insert_ok(blk_t *array, int cnt, blk_t new)
> +{
> +   return (cnt == 0 || array[cnt - 1] != new);
> +}
> +
> +/*
> + * Merge list from src to dest
> + */
> +static errcode_t merge_u32_list(ext2_u32_list src, ext2_u32_list dest)
> +{
> +   errcode_t    retval;
> +   int      src_count = src->num;
> +   int      dest_count = dest->num;
> +   int      size = src_count + dest_count;
> +   int      size_entry = sizeof(blk_t);
> +   blk_t       *array;
> +   blk_t       *src_array = src->list;
> +   blk_t       *dest_array = dest->list;
> +   int      src_index = 0;
> +   int      dest_index = 0;
> +   int      uniq_cnt = 0;
> +
> +   if (src->num == 0)
> +       return 0;
> +
> +   retval = ext2fs_get_array(size, size_entry, &array);
> +   if (retval)
> +       return retval;
> +
> +   /*
> +    * It is possible that src list and dest list could be
> +    * duplicated when merging badblocks.
> +    */
> +   while (src_index < src_count || dest_index < dest_count) {
> +       if (src_index >= src_count) {
> +           for (; dest_index < dest_count; dest_index++)
> +               if (insert_ok(array, uniq_cnt, dest_array[dest_index]))
> +                   array[uniq_cnt++] = dest_array[dest_index];
> +           break;
> +       }
> +       if (dest_index >= dest_count) {
> +           for (; src_index < src_count; src_index++)
> +               if (insert_ok(array, uniq_cnt, src_array[src_index]))
> +                   array[uniq_cnt++] = src_array[src_index];
> +           break;
> +       }
> +       if (src_array[src_index] < dest_array[dest_index]) {
> +           if (insert_ok(array, uniq_cnt, src_array[src_index]))
> +               array[uniq_cnt++] = src_array[src_index];
> +           src_index++;
> +       } else if (src_array[src_index] > dest_array[dest_index]) {
> +           if (insert_ok(array, uniq_cnt, dest_array[dest_index]))
> +               array[uniq_cnt++] = dest_array[dest_index];
> +           dest_index++;
> +       } else {
> +           if (insert_ok(array, uniq_cnt, dest_array[dest_index]))
> +               array[uniq_cnt++] = dest_array[dest_index];
> +           src_index++;
> +           dest_index++;
> +       }
> +   }
> +
> +   ext2fs_free_mem(&dest->list);
> +   dest->list = array;
> +   dest->num = uniq_cnt;
> +   dest->size = size;
> +   return 0;
> +}
> 
> /*
>  * This procedure creates an empty u32 list.
> @@ -91,6 +159,13 @@ errcode_t ext2fs_badblocks_copy(ext2_badblocks_list src,
>                   (ext2_u32_list *) dest);
> }
> 
> +errcode_t ext2fs_badblocks_merge(ext2_badblocks_list src,
> +                ext2_badblocks_list dest)
> +{
> +   return merge_u32_list((ext2_u32_list) src,
> +                 (ext2_u32_list) dest);
> +}
> +
> /*
>  * This procedure frees a badblocks list.
>  *
> diff --git a/lib/ext2fs/ext2fs.h b/lib/ext2fs/ext2fs.h
> index 9cc994b1..18dddc2c 100644
> --- a/lib/ext2fs/ext2fs.h
> +++ b/lib/ext2fs/ext2fs.h
> @@ -845,6 +845,8 @@ extern int ext2fs_badblocks_list_iterate(ext2_badblocks_iterate iter,
> extern void ext2fs_badblocks_list_iterate_end(ext2_badblocks_iterate iter);
> extern errcode_t ext2fs_badblocks_copy(ext2_badblocks_list src,
>                       ext2_badblocks_list *dest);
> +extern errcode_t ext2fs_badblocks_merge(ext2_badblocks_list src,
> +                   ext2_badblocks_list dest);
> extern int ext2fs_badblocks_equal(ext2_badblocks_list bb1,
>                  ext2_badblocks_list bb2);
> extern int ext2fs_u32_list_count(ext2_u32_list bb);
> -- 
> 2.37.3
>