linux-kernel - Re: [f2fs-dev] [PATCH 2/2] f2fs: add F2FS_IOC_DECOMPRESS_FILE and F2FS_IOC_COMPRESS

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Date:   Mon, 23 Nov 2020 10:48:21 -0800
From:   Eric Biggers <ebiggers@...nel.org>
To:     Daeho Jeong <daeho43@...il.com>
Cc:     linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net, kernel-team@...roid.com,
        Daeho Jeong <daehojeong@...gle.com>
Subject: Re: [f2fs-dev] [PATCH 2/2] f2fs: add F2FS_IOC_DECOMPRESS_FILE and
 F2FS_IOC_COMPRESS_FILE

On Mon, Nov 23, 2020 at 12:17:51PM +0900, Daeho Jeong wrote:
> From: Daeho Jeong <daehojeong@...gle.com>
> 
> Added two ioctl to decompress/compress explicitly the compression
> enabled file in "compress_mode=user-based" mount option.
> 
> Using these two ioctls, the users can make a control of compression
> and decompression of their files.
> 
> Signed-off-by: Daeho Jeong <daehojeong@...gle.com>
> ---
>  fs/f2fs/file.c            | 181 +++++++++++++++++++++++++++++++++++++-
>  include/uapi/linux/f2fs.h |   2 +
>  2 files changed, 182 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> index be8db06aca27..e8f142470e87 100644
> --- a/fs/f2fs/file.c
> +++ b/fs/f2fs/file.c
> @@ -4026,6 +4026,180 @@ static int f2fs_ioc_set_compress_option(struct file *filp, unsigned long arg)
>  	return ret;
>  }
>  
> +static int redirty_blocks(struct inode *inode, pgoff_t page_idx, int len)
> +{
> +	DEFINE_READAHEAD(ractl, NULL, inode->i_mapping, page_idx);
> +	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
> +	struct address_space *mapping = inode->i_mapping;
> +	struct page *page;
> +	pgoff_t redirty_idx = page_idx;
> +	int i, page_len = 0, ret = 0;
> +
> +	page_cache_ra_unbounded(&ractl, len, 0);

Using page_cache_ra_unbounded() here looks wrong.  See the comment above
page_cache_ra_unbounded().

>  static long __f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
>  {
>  	switch (cmd) {
> @@ -4113,6 +4287,10 @@ static long __f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
>  		return f2fs_ioc_get_compress_option(filp, arg);
>  	case F2FS_IOC_SET_COMPRESS_OPTION:
>  		return f2fs_ioc_set_compress_option(filp, arg);
> +	case F2FS_IOC_DECOMPRESS_FILE:
> +		return f2fs_ioc_decompress_file(filp, arg);
> +	case F2FS_IOC_COMPRESS_FILE:
> +		return f2fs_ioc_compress_file(filp, arg);
>  	default:
>  		return -ENOTTY;
>  	}

Where is the documentation and tests for these new ioctls?

- Eric