linux-kernel - Re: [11/36] Use page_cache

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Message-ID: <Pine.LNX.4.64.0708301843280.13292@schroedinger.engr.sgi.com>
Date:	Thu, 30 Aug 2007 18:47:45 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Dmitry Monakhov <dmonakhov@...ru>
cc:	torvalds@...ux-foundation.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, Christoph Hellwig <hch@....de>,
	Mel Gorman <mel@...net.ie>,
	William Lee Irwin III <wli@...omorphy.com>,
	David Chinner <dgc@....com>,
	Jens Axboe <jens.axboe@...cle.com>,
	Badari Pulavarty <pbadari@...il.com>,
	Maxim Levitsky <maximlevitsky@...il.com>,
	Fengguang Wu <fengguang.wu@...il.com>,
	swin wang <wangswin@...il.com>, totty.lu@...il.com,
	"H. Peter Anvin" <hpa@...or.com>, joern@...ybastard.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [11/36] Use page_cache_xxx in fs/buffer.c

This may already be handled?

submit_bh() calls submit_bio() which calls __generic_make_request() and 
there we do:

                if (unlikely(bio_sectors(bio) > q->max_hw_sectors)) {
                        printk("bio too big device %s (%u > %u)\n",
                                bdevname(bio->bi_bdev, b),
                                bio_sectors(bio),
                                q->max_hw_sectors);
                        goto end_io;
                }

So if we try to push a too large buffer down with submit_bh() we get a 
failure.

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