Merged to address android build breakage.

On 09/28, Daeho Jeong wrote:
> From: Daeho Jeong <[email protected]>
> 
> In lower versions than macOS 10.12, they don't support clock_gettime
> function. It breaks the build, so we need to fall back to the original
> kernel version check algorithm, in that case.
> 
> Signed-off-by: Daeho Jeong <[email protected]>
> ---
>  fsck/mount.c | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/fsck/mount.c b/fsck/mount.c
> index 7c4c681..c928a15 100644
> --- a/fsck/mount.c
> +++ b/fsck/mount.c
> @@ -975,6 +975,16 @@ int validate_super_block(struct f2fs_sb_info *sbi, enum 
> SB_ADDR sb_addr)
>               MSG(0, "Info: MKFS version\n  \"%s\"\n", c.init_version);
>               MSG(0, "Info: FSCK version\n  from \"%s\"\n    to \"%s\"\n",
>                                       c.sb_version, c.version);
> +#if defined(__APPLE__)
> +             if (!c.no_kernel_check &&
> +                     memcmp(c.sb_version, c.version, VERSION_NAME_LEN)) {
> +                     c.auto_fix = 0;
> +                     c.fix_on = 1;
> +                     memcpy(sbi->raw_super->version,
> +                                     c.version, VERSION_NAME_LEN);
> +                     update_superblock(sbi->raw_super, SB_MASK(sb_addr));
> +             }
> +#else
>               if (!c.no_kernel_check) {
>                       struct timespec t;
>                       u32 prev_time, cur_time, time_diff;
> @@ -1007,6 +1017,7 @@ int validate_super_block(struct f2fs_sb_info *sbi, enum 
> SB_ADDR sb_addr)
>                       update_superblock(sbi->raw_super, SB_MASK(sb_addr));
>               }
>  out:
> +#endif
>               print_sb_state(sbi->raw_super);
>               return 0;
>       }
> -- 
> 2.33.0.685.g46640cef36-goog


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