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List:       fuse-devel
Subject:    Re: [fuse-devel] [PATCH 0/3] fuse: fixes for writepages
From:       Maxim Patlasov <mpatlasov () parallels ! com>
Date:       2013-09-20 8:06:10
Message-ID: 523C01F2.40006 () parallels ! com
[Download RAW message or body]

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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