linux-kernel - Re: [PATCH 2/2] OCFS2: Allow huge (> 16 TiB) volumes to mount

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Message-Id: <3BB069D5-B193-43A4-B678-B3CEA4873B58@dilger.ca>
Date:	Mon, 12 Jul 2010 18:21:34 -0600
From:	Andreas Dilger <adilger@...ger.ca>
To:	"Patrick J. LoPresti" <lopresti@...il.com>
Cc:	ocfs2-devel@....oracle.com, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org
Subject: Re: [PATCH 2/2] OCFS2: Allow huge (> 16 TiB) volumes to mount

On 2010-07-11, at 11:04, Patrick J. LoPresti wrote:
> +/* Check to make sure entire volume is addressable on this system.
> +   Requires osb_clusters_at_boot to be valid and for the journal to
> +   have been initialized by ocfs2_journal_init(). */
> +static int ocfs2_check_addressable(struct ocfs2_super *osb)
> +{
> +	/* Absolute addressability check (borrowed from ext4/super.c) */
> +	if ((max_block >
> +	     (sector_t)(~0LL) >> (osb->sb->s_blocksize_bits - 9)) ||
> +	    (max_block > (pgoff_t)(~0LL) >> (PAGE_CACHE_SHIFT -
> +					     osb->sb->s_blocksize_bits))) {
> +		mlog(ML_ERROR, "Volume too large "
> +		     "to mount safely on this system");
> +		status = -EFBIG;
> +		goto out;
> +	}

This hunk of code is actually in several filesystems.  It wouldn't be a bad idea to make it a library function that can be called by the filesystem to check the kernel page cache and block layer can handle these large filesystems.

Cheers, Andreas





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