Re: [PATCH 04/16] GFS2: Daemons and address space operations

[Wendy Cheng]

Steven Whitehouse wrote

> +static int gfs2_writepage(struct page *page, struct writeback_control *wbc)
> +{
> +	struct inode *inode = page->mapping->host;
> +	struct gfs2_inode *ip = page->mapping->host->u.generic_ip;
> +	struct gfs2_sbd *sdp = ip->i_sbd;
> +	loff_t i_size = i_size_read(inode);
> +	pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
> +	unsigned offset;
> +	int error;
> +	int done_trans = 0;
> +
> +	if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(ip->i_gl))) {
> +		unlock_page(page);
> +		return -EIO;
> +	}
> +	if (current->journal_info)
> +		goto out_ignore;
> +
> +	/* Is the page fully outside i_size? (truncate in progress) */
> +        offset = i_size & (PAGE_CACHE_SIZE-1);
> +	if (page->index >= end_index+1 || !offset) {
> +		page->mapping->a_ops->invalidatepage(page, 0);
> +		unlock_page(page);
> +		return 0; /* don't care */
> +	}
>
>  
Will above "|| !offset" unconditionally drop the page if the file size 
happens to be multiples of PAGE_CACHE_SIZE ?  Maybe this truncate 
handling should be removed to let block_write_full_page() handle all the 
cases ?

> +	error = block_write_full_page(page, get_block_noalloc, wbc);
> +	if (done_trans)
> +		gfs2_trans_end(sdp);
> +	gfs2_meta_cache_flush(ip);
> +	return error;
> +
> +out_ignore:
> +	redirty_page_for_writepage(wbc, page);
> +	unlock_page(page);
> +	return 0;
> +}
> +
>  
-- Wendy
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