On 2012-07-24 21:48 Christoph Hellwig <hch@xxxxxxxxxxxxx> Wrote:
>On Tue, Jul 24, 2012 at 08:44:27PM +0800, majianpeng wrote:
>> On 2012-05-29 16:56 majianpeng <majianpeng@xxxxxxxxx> Wrote:
>> >The size of block-device is larger than 16TB, and the os is 32bit.
>> >If the offset of read/write is larger then 16TB. The index of address_space will
>> >overflow and supply data from low offset instead.
>
>We can't support > 16TB block device on 32-bit systems with 4k page
>size, just like we can't support files that large.
>
>For filesystems the s_maxbytes limit of MAX_LFS_FILESIZE takes care of
>that, but it seems like we miss that check for block devices.
>
>The proper fix is to add that check (either via s_maxbytes or by
>checking MAX_LFS_FILESIZE) to generic_write_checks and
>generic_file_aio_read (or a block device specific wrapper)
>
I had a problem:why do read-operation not to check like generic_write_chekcs??韬{.n???檩jg???a?旃???)钋???骅w+h?璀?ｙ/i?⒏??⒎???Щ ??m?? ?)钋???痂?^??觥??ザ?v???O璁?f??i?⒏?