linux-kernel - Re: Kernel 3.1.0-rc4 oops when connecting iPod

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Message-ID: <1315748768.65310.YahooMailClassic@web29513.mail.ird.yahoo.com>
Date:	Sun, 11 Sep 2011 14:46:08 +0100 (BST)
From:	Hin-Tak Leung <hintak_leung@...oo.co.uk>
To:	Pavel Ivanov <paivanof@...il.com>
Cc:	linux-fsdevel@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Christoph Hellwig <hch@...era.com>
Subject: Re: Kernel 3.1.0-rc4 oops when connecting iPod

--- On Sun, 11/9/11, Pavel Ivanov <paivanof@...il.com> wrote:

> How about the following patch?
> 
> 
> Subject: [PATCH] hfsplus: Allow to mount filesystem with
> block size
> greater than PAGE_SIZE
> 
> Commit c6d5f5fa (hfsplus: lift the 2TB size limit) added
> call to
> generic_check_addressable() but used the system's internal
> block size
> which can be larger than PAGE_SIZE and will cause
> generic_check_addressable() to return -EINVAL in this case.
> This
> results in impossibility to mount file systems with such
> block sizes.
> To fix it we have to use block size understandable by
> generic_check_addressable() and adjust number of blocks
> accordingly.
> 
> Signed-off-by: Pavel Ivanov <paivanof@...il.com>
> Cc: <stable@...nel.org>
> ---
> 
> diff --git a/fs/hfsplus/super.c b/fs/hfsplus/super.c
> index c106ca2..26ac5a5 100644
> --- a/fs/hfsplus/super.c
> +++ b/fs/hfsplus/super.c
> @@ -399,8 +399,17 @@ static int hfsplus_fill_super(struct
> super_block
> *sb, void *data, int silent)
>      if (!sbi->rsrc_clump_blocks)
>         
> sbi->rsrc_clump_blocks = 1;
> 
> -    err =
> generic_check_addressable(sbi->alloc_blksz_shift,
> -           
>        
> sbi->total_blocks);
> +    /*
> +     * Check that filesystem data
> can be addressed by sector_t. Obvious way
> +     * to do that is to call
> generic_check_addressable with alloc_blksz_shift
> +     * and total_blocks as
> parameters. But alloc_blksz_shift can be greater
> +     * than PAGE_SIZE_SHIFT and
> in this case it won't be accepted by
> +     * generic_check_addressable.
> s_blocksize_bits will always be accepted
> +     * and difference between it
> and alloc_blksz_shift will be always in
> +     * fs_shift.
> +     */
> +    err =
> generic_check_addressable(sb->s_blocksize_bits,
> +           
> (u64)sbi->total_blocks << sbi->fs_shift);
>      if (err) {
>          printk(KERN_ERR
> "hfs: filesystem size too large.\n");
>          goto out_free_vhdr;

Why is the u64 needed? If it is needed, it probably means sbi->total_blocks should have been u64 in the first place.

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