Re: [PATCH v2] f2fs: convert inline data for direct I/O & FI_NO_PREALLOC

[Chao Yu <chao@kernel.org>]

On 2017/9/29 22:43, guoweichao@huawei.com wrote:
> From: Weichao Guo <guoweichao@huawei.com>
> 
> In FI_NO_PREALLOC cases, direct I/O path may allocate blocks for an
> inode but keep its inline data flag. This inconsistency may trigger
> vfs clear_inode nrpages bug_on when evicting the inode. We should
> convert inline data first in this case.
> 
> Signed-off-by: Weichao Guo <guoweichao@huawei.com>

Reviewed-by: Chao Yu <yuchao0@huawei.com>

> ---
>  fs/f2fs/data.c | 13 ++++++++-----
>  1 file changed, 8 insertions(+), 5 deletions(-)
> 
> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> index 36b5352..3793ba4 100644
> --- a/fs/f2fs/data.c
> +++ b/fs/f2fs/data.c
> @@ -833,6 +833,13 @@ int f2fs_preallocate_blocks(struct kiocb *iocb, struct iov_iter *from)
>  	struct f2fs_map_blocks map;
>  	int err = 0;
>  
> +	/* convert inline data for Direct I/O*/
> +	if (iocb->ki_flags & IOCB_DIRECT) {
> +		err = f2fs_convert_inline_inode(inode);
> +		if (err)
> +			return err;
> +	}
> +
>  	if (is_inode_flag_set(inode, FI_NO_PREALLOC))
>  		return 0;
>  
> @@ -845,15 +852,11 @@ int f2fs_preallocate_blocks(struct kiocb *iocb, struct iov_iter *from)
>  
>  	map.m_next_pgofs = NULL;
>  
> -	if (iocb->ki_flags & IOCB_DIRECT) {
> -		err = f2fs_convert_inline_inode(inode);
> -		if (err)
> -			return err;
> +	if (iocb->ki_flags & IOCB_DIRECT)
>  		return f2fs_map_blocks(inode, &map, 1,
>  			__force_buffered_io(inode, WRITE) ?
>  				F2FS_GET_BLOCK_PRE_AIO :
>  				F2FS_GET_BLOCK_PRE_DIO);
> -	}
>  	if (iocb->ki_pos + iov_iter_count(from) > MAX_INLINE_DATA(inode)) {
>  		err = f2fs_convert_inline_inode(inode);
>  		if (err)
> 

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