linux-kernel - Re: [PATCH 0/3] fuse: fixes for writepages

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Message-ID: <523C01F2.40006@parallels.com>
Date:	Fri, 20 Sep 2013 12:06:10 +0400
From:	Maxim Patlasov <mpatlasov@...allels.com>
To:	Miklos Szeredi <miklos@...redi.hu>
CC:	<linux-fsdevel@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	"fuse-devel@...ts.sourceforge.net" <fuse-devel@...ts.sourceforge.net>
Subject: Re: [PATCH 0/3] fuse: fixes for writepages

Miklos,

On 09/19/2013 08:11 PM, Miklos Szeredi wrote:
> Maxim,
>
> Please review and test these.  I've appended them to writepages.v2 and for-next.

Thanks a lot for efforts. I'll start to work on it now and send you 
feedback as soon as I get a progress.

Btw, adding fuse-devel to cc.

Thanks,
Maxim

>
> Here's a test patch for the rewrites stuff.  It simply disables the waiting in
> fuse_page_mkwrite() and is quite effective in generating rewrites in my
> testcase.
>
> Thanks,
> Miklos
>
> ---
>   fs/fuse/file.c |    6 +++++-
>   1 file changed, 5 insertions(+), 1 deletion(-)
>
> --- a/fs/fuse/file.c
> +++ b/fs/fuse/file.c
> @@ -1498,6 +1498,7 @@ static void fuse_writepage_end(struct fu
>   
>   	mapping_set_error(inode->i_mapping, req->out.h.error);
>   	spin_lock(&fc->lock);
> +	int count = 0;
>   	while (req->misc.write.next) {
>   		struct fuse_req *next = req->misc.write.next;
>   		req->misc.write.next = next->misc.write.next;
> @@ -1505,7 +1506,10 @@ static void fuse_writepage_end(struct fu
>   		list_add(&next->writepages_entry, &fi->writepages);
>   		list_add_tail(&next->list, &fi->queued_writes);
>   		fuse_flush_writepages(inode);
> +		count++;
>   	}
> +	if (count)
> +		printk("rewrite: %i\n", count);
>   	fi->writectr--;
>   	fuse_writepage_finish(fc, req);
>   	spin_unlock(&fc->lock);
> @@ -1884,7 +1888,7 @@ static int fuse_page_mkwrite(struct vm_a
>   		return VM_FAULT_NOPAGE;
>   	}
>   
> -	fuse_wait_on_page_writeback(inode, page->index);
> +	//fuse_wait_on_page_writeback(inode, page->index);
>   	return VM_FAULT_LOCKED;
>   }
>   
>
>
>

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