Re: [PATCH] ext4: fix checking on nr_to_write

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Mon, Oct 14, 2013 at 8:58 PM, Jan Kara <jack@xxxxxxx> wrote:
>   Umm, I guess I see what are you pointing at. Thanks for catching that.
> mpage_process_page_bufs() always adds a buffer to mpd even if nr_to_write
> is already <= 0. But I would somewhat prefer not to call
> mpage_prepare_extent_to_map() at all when nr_to_write <= 0. So a patch
> like:
>                 ret = mpage_prepare_extent_to_map(&mpd);
>                 if (!ret) {
> -                       if (mpd.map.m_len)
> +                       if (mpd.map.m_len) {
>                                 ret = mpage_map_and_submit_extent(handle, &mpd,
>                                         &give_up_on_write);
> -                       else {
> +                               done = (wbc->nr_to_write <= 0);
> +                       } else {
>
> Should also fix your problem, am I right?

I am afraid it can't, because we need to stop scanning page cache
if end of file is reached.

nr_to_write will become negative inside mpage_map_and_submit_extent(),
that is why I fix it inside mpage_prepare_extent_to_map().


Thanks,
--
Ming Lei
--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html




[Index of Archives]     [Reiser Filesystem Development]     [Ceph FS]     [Kernel Newbies]     [Security]     [Netfilter]     [Bugtraq]     [Linux FS]     [Yosemite National Park]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Samba]     [Device Mapper]     [Linux Media]

  Powered by Linux