On Mon, Apr 26, 2021 at 10:11:53AM +0800, 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 <changfeng...@vivo.com>
Even though I didn't look into the whole thing,
my reaction here is roughly how to handle fallocate with
keep size? Does it work as expected?
> ---
> 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;
> 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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