linux-kernel - Re: [f2fs-dev][PATCH] f2fs: not allowed to set file both cold and hot

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Date:   Tue, 20 Jun 2023 08:33:38 +0800
From:   Chao Yu <chao@...nel.org>
To:     Yunlei He <heyunlei@...o.com>, jaegeuk@...nel.org
Cc:     linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org
Subject: Re: [f2fs-dev][PATCH] f2fs: not allowed to set file both cold and hot

On 2023/6/13 16:52, Yunlei He wrote:
> File set both cold and hot advise bit is confusion, so
> return EINVAL to avoid this case.
> 
> Signed-off-by: Yunlei He <heyunlei@...o.com>
> ---
>   fs/f2fs/xattr.c | 3 +++
>   1 file changed, 3 insertions(+)
> 
> diff --git a/fs/f2fs/xattr.c b/fs/f2fs/xattr.c
> index 213805d3592c..917f3ac9f1a1 100644
> --- a/fs/f2fs/xattr.c
> +++ b/fs/f2fs/xattr.c
> @@ -127,6 +127,9 @@ static int f2fs_xattr_advise_set(const struct xattr_handler *handler,
>                  return -EINVAL;
> 
>          new_advise = new_advise & FADVISE_MODIFIABLE_BITS;
> +       if ((new_advise & FADVISE_COLD_BIT) && (new_advise & FADVISE_HOT_BIT))
> +               return -EINVAL;

Yunlei,

What about the below case:

1. f2fs_xattr_advise_set(FADVISE_COLD_BIT)
2. f2fs_xattr_advise_set(FADVISE_HOT_BIT)

Thanks,

> +
>          new_advise |= old_advise & ~FADVISE_MODIFIABLE_BITS;
> 
>          F2FS_I(inode)->i_advise = new_advise;
> --