From mboxrd@z Thu Jan 1 00:00:00 1970 From: Hugh Dickins Subject: Re: the max size of block device on 32bit os,when using do_generic_file_read() proceed. Date: Sat, 26 May 2012 14:23:43 -0700 (PDT) Message-ID: References: <201205242138175936268@gmail.com> Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Cc: Al Viro , Andrew Morton , linux-mm@kvack.org, linux-fsdevel@vger.kernel.org To: majianpeng Return-path: In-Reply-To: <201205242138175936268@gmail.com> Sender: owner-linux-mm@kvack.org List-Id: linux-fsdevel.vger.kernel.org On Thu, 24 May 2012, majianpeng wrote: > Hi all: > I readed a raid5,which size 30T.OS is RHEL6 32bit. > I reaed the raid5(as a whole,not parted) and found read address which not i wanted. > So I tested the newest kernel code,the problem is still. > I review the code, in function do_generic_file_read() > > index = *ppos >> PAGE_CACHE_SHIFT; > index is u32.and *ppos is long long. > So when *ppos is larger than 0xFFFF FFFF * PAGE_CACHE_SHIFT(16T Byte),then the index is error. > > I wonder this .In 32bit os ,block devices size do not large then 16T,in other words, if block devices larger than 16T,must parted. I am not surprised that the page cache limitation prevents you from reading the whole device with a 32-bit kernel. See MAX_LFS_FILESIZE in include/linux/fs.h. Our answer to that is just to use a 64-bit kernel. #if BITS_PER_LONG==32 #define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1) #elif BITS_PER_LONG==64 #define MAX_LFS_FILESIZE 0x7fffffffffffffffUL #endif But I am a little surprised that you get as far as 16TiB (with 4k page): I would have expected you to be stopped just before 8TiB (although I suspect that the limitation to 8TiB rather than 16TiB is unnecessary). And if I understand you correctly, read() or pread() gave you no error at those large offsets, but supplied data from the low offset instead? That does surprise me - have we missed a check there? Hugh -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org From mboxrd@z Thu Jan 1 00:00:00 1970 From: "majianpeng" Subject: Re: Re: the max size of block device on 32bit os,when usingdo_generic_file_read() proceed. Date: Mon, 28 May 2012 14:26:27 +0800 Message-ID: <201205281426238284699__41144.3240744576$1338186348$gmane$org@gmail.com> References: <201205242138175936268@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset="gb2312" Content-Transfer-Encoding: base64 Cc: "Al Viro" , "Andrew Morton" , "linux-mm" , "linux-fsdevel" To: "Hugh Dickins" Return-path: Received: from mail-pb0-f46.google.com ([209.85.160.46]:48577 "EHLO mail-pb0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753822Ab2E1GZi (ORCPT ); Mon, 28 May 2012 02:25:38 -0400 Received: by pbbrp8 with SMTP id rp8so4251817pbb.19 for ; Sun, 27 May 2012 23:25:37 -0700 (PDT) Sender: linux-fsdevel-owner@vger.kernel.org List-ID: U29ycnkgZm9yIGxhdGUgdG8gcmVwbHkuSSByZXZpZXdlZCB0aGUgY29kZSBhZ2FpbiBhbmQgZm91 bmQgc29tZSBwcm9ibGVhbS4NCkkgY3JlYXRlZCBhIHNvZnQtcmFpZCBhbmQgdGhlIHNpemUgd2Fz IGxhcmdlciB0aGFuIDE2VC4NClRoZSBvcyBpcyB1YnVudHUgMTIuMDQgMzJiaXQgeDg2Lg0KVGhl 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Message-ID: <201205242138175936268@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: akpm , hughd Cc: linux-mm Hi all: I readed a raid5,which size 30T.OS is RHEL6 32bit. I reaed the raid5(as a whole,not parted) and found read address which not i wanted. So I tested the newest kernel code,the problem is still. I review the code, in function do_generic_file_read() index = *ppos >> PAGE_CACHE_SHIFT; index is u32.and *ppos is long long. So when *ppos is larger than 0xFFFF FFFF * PAGE_CACHE_SHIFT(16T Byte),then the index is error. I wonder this .In 32bit os ,block devices size do not large then 16T,in other words, if block devices larger than 16T,must parted. Thanks all. -------------- majianpeng 2012-05-24 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx206.postini.com [74.125.245.206]) by kanga.kvack.org (Postfix) with SMTP id 9AD106B0082 for ; Mon, 28 May 2012 02:25:38 -0400 (EDT) Received: by pbbrp2 with SMTP id rp2so5262227pbb.14 for ; Sun, 27 May 2012 23:25:37 -0700 (PDT) Date: Mon, 28 May 2012 14:26:27 +0800 From: "majianpeng" References: <201205242138175936268@gmail.com> Subject: Re: Re: the max size of block device on 32bit os,when usingdo_generic_file_read() proceed. Message-ID: <201205281426238284699@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset="gb2312" Content-Transfer-Encoding: base64 Sender: owner-linux-mm@kvack.org List-ID: To: Hugh Dickins Cc: Al Viro , Andrew Morton , linux-mm , linux-fsdevel U29ycnkgZm9yIGxhdGUgdG8gcmVwbHkuSSByZXZpZXdlZCB0aGUgY29kZSBhZ2FpbiBhbmQgZm91 bmQgc29tZSBwcm9ibGVhbS4NCkkgY3JlYXRlZCBhIHNvZnQtcmFpZCBhbmQgdGhlIHNpemUgd2Fz IGxhcmdlciB0aGFuIDE2VC4NClRoZSBvcyBpcyB1YnVudHUgMTIuMDQgMzJiaXQgeDg2Lg0KVGhl IHVkZXYgY3JlYXRlIHRoZSBibG9jayBub2RlIGlzIC9kZXYgZGlyKGFzIHRtcGZzKS4NCkFuZCBJ IHJlYWRlZCB0aGUgdG1wZnMgY29kZSA6DQppbiBtbS9zaG1lbS5jOnNobWVtX2ZpbGxfc3VwZXIo KQ0KPnNiLT5zX21heGJ5dGVzID0gTUFYX0xGU19GSUxFU0laRTsNCkluIG15IGNvbXB1dGVyLCBN QVhfTEZTX0ZJTEVTWkUgaXMgZXF1YWwgOFQgLTEuDQpCdXQgdGhlIHJlYWQgY29kZToNCmdlbmVy aWNfZmlsZV9haW9fcmVhZC0tPmRvX2dlbmVyaWNfZmlsZV9yZWFkW25vdCB1c2UgZGlyZWN0IGZs YWcNCkluIGZ1bmN0aW9uOmRvX2dlbmVyaWNfZmlsZV9yZWFkKCk6DQo+aW5kZXggPSAqcHBvcyA+ 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