Re: [f2fs-dev] [PATCH] f2fs: compress: avoid unnecessary check in f2fs_prepare_compress_overwrite

[Chao Yu <yuchao0@huawei.com>]

On 2021/4/26 10:11, Fengnan Chang wrote:
> when write compressed file with O_TRUNC, there will be a lot of
> unnecessary check valid blocks in f2fs_prepare_compress_overwrite,
> especially when written in page size, remove it.
> 
> Signed-off-by: Fengnan Chang <changfengnan@vivo.com>
> ---
>   fs/f2fs/data.c | 4 ++++
>   1 file changed, 4 insertions(+)
> 
> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> index cf935474ffba..9c3b0849f35e 100644
> --- a/fs/f2fs/data.c
> +++ b/fs/f2fs/data.c
> @@ -3270,6 +3270,7 @@ static int f2fs_write_begin(struct file *file, struct address_space *mapping,
>   	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
>   	struct page *page = NULL;
>   	pgoff_t index = ((unsigned long long) pos) >> PAGE_SHIFT;
> +	pgoff_t end = (i_size_read(inode) + PAGE_SIZE - 1) >> PAGE_SHIFT;

Should define this under compression macro, otherwise it may cause compile
warning.

>   	bool need_balance = false, drop_atomic = false;
>   	block_t blkaddr = NULL_ADDR;
>   	int err = 0;
> @@ -3306,6 +3307,9 @@ static int f2fs_write_begin(struct file *file, struct address_space *mapping,
> 
>   		*fsdata = NULL;
> 
> +		if (index >= end)
> +			goto repeat;
> +
>   		ret = f2fs_prepare_compress_overwrite(inode, pagep,
>   							index, fsdata);
>   		if (ret < 0) {
> --
> 2.29.0
> 
> 
> 
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> .
> 


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