On 12/20, Yunlei He wrote:
> If the range we write cover the whole valid data in the last page,
> we do not need to read it.
>
> Signed-off-by: Yunlei He <[email protected]>
> ---
> fs/f2fs/data.c | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> index 9ac2625..303873f 100644
> --- a/fs/f2fs/data.c
> +++ b/fs/f2fs/data.c
> @@ -1715,6 +1715,9 @@ static int f2fs_write_begin(struct file *file, struct
> address_space *mapping,
> if (len == PAGE_SIZE || PageUptodate(page))
> return 0;
>
> + if (!(pos & (PAGE_SIZE - 1)) && (pos + len) >= i_size_read(inode))
I added here:
zero_user_segment(page, 0, PAGE_SIZE);
Otherwise, xfstests/f2fs/001 gives a failure.
Thanks,
> + return 0;
> +
> if (blkaddr == NEW_ADDR) {
> zero_user_segment(page, 0, PAGE_SIZE);
> SetPageUptodate(page);
> @@ -1768,7 +1771,7 @@ static int f2fs_write_end(struct file *file,
> * let generic_perform_write() try to copy data again through copied=0.
> */
> if (!PageUptodate(page)) {
> - if (unlikely(copied != PAGE_SIZE))
> + if (unlikely(copied != len))
> copied = 0;
> else
> SetPageUptodate(page);
> --
> 2.10.1
>
>
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