linux-kernel - Re: [PATCH v5 6/8] f2fs: simplify f2fs_force_buffered

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Message-ID: <Ywz5CrBg6udTMnW/@google.com>
Date:   Mon, 29 Aug 2022 10:36:10 -0700
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     Eric Biggers <ebiggers@...nel.org>
Cc:     linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net, linux-xfs@...r.kernel.org,
        linux-api@...r.kernel.org, linux-fscrypt@...r.kernel.org,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        Keith Busch <kbusch@...nel.org>
Subject: Re: [PATCH v5 6/8] f2fs: simplify f2fs_force_buffered_io()

On 08/26, Eric Biggers wrote:
> From: Eric Biggers <ebiggers@...gle.com>
> 
> f2fs only allows direct I/O that is aligned to the filesystem block
> size.  Given that fact, simplify f2fs_force_buffered_io() by removing
> the redundant call to block_unaligned_IO().
> 
> This makes it easier to reuse this code for STATX_DIOALIGN.
> 
> Signed-off-by: Eric Biggers <ebiggers@...gle.com>

Acked-by: Jaegeuk Kim <jaegeuk@...nel.org>

> ---
>  fs/f2fs/file.c | 27 +++++----------------------
>  1 file changed, 5 insertions(+), 22 deletions(-)
> 
> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> index 8a9455bf956f16..8e11311db21060 100644
> --- a/fs/f2fs/file.c
> +++ b/fs/f2fs/file.c
> @@ -808,22 +808,9 @@ int f2fs_truncate(struct inode *inode)
>  	return 0;
>  }
>  
> -static int block_unaligned_IO(struct inode *inode, struct kiocb *iocb,
> -			      struct iov_iter *iter)
> -{
> -	unsigned int i_blkbits = READ_ONCE(inode->i_blkbits);
> -	unsigned int blocksize_mask = (1 << i_blkbits) - 1;
> -	loff_t offset = iocb->ki_pos;
> -	unsigned long align = offset | iov_iter_alignment(iter);
> -
> -	return align & blocksize_mask;
> -}
> -
> -static bool f2fs_force_buffered_io(struct inode *inode,
> -				   struct kiocb *iocb, struct iov_iter *iter)
> +static bool f2fs_force_buffered_io(struct inode *inode, int rw)
>  {
>  	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
> -	int rw = iov_iter_rw(iter);
>  
>  	if (!fscrypt_dio_supported(inode))
>  		return true;
> @@ -836,13 +823,9 @@ static bool f2fs_force_buffered_io(struct inode *inode,
>  	if (f2fs_is_multi_device(sbi) && !sbi->aligned_blksize)
>  		return true;
>  
> -	if (f2fs_lfs_mode(sbi) && (rw == WRITE)) {
> -		if (block_unaligned_IO(inode, iocb, iter))
> -			return true;
> -		if (F2FS_IO_ALIGNED(sbi))
> -			return true;
> -	}
> -	if (is_sbi_flag_set(F2FS_I_SB(inode), SBI_CP_DISABLED))
> +	if (f2fs_lfs_mode(sbi) && rw == WRITE && F2FS_IO_ALIGNED(sbi))
> +		return true;
> +	if (is_sbi_flag_set(sbi, SBI_CP_DISABLED))
>  		return true;
>  
>  	return false;
> @@ -4222,7 +4205,7 @@ static bool f2fs_should_use_dio(struct inode *inode, struct kiocb *iocb,
>  	if (!(iocb->ki_flags & IOCB_DIRECT))
>  		return false;
>  
> -	if (f2fs_force_buffered_io(inode, iocb, iter))
> +	if (f2fs_force_buffered_io(inode, iov_iter_rw(iter)))
>  		return false;
>  
>  	/*
> -- 
> 2.37.2