linux-kernel - Re: UML/man: BLKGETSIZE takes a long, not an int

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Message-ID: <46D2D0E2.9060408@gmx.net>
Date:	Mon, 27 Aug 2007 15:25:54 +0200
From:	Michael Kerrisk <mtk-manpages@....net>
To:	Nicolas George <nicolas.george@....fr>
CC:	linux-kernel@...r.kernel.org,
	user-mode-linux-devel@...ts.sourceforge.net, jdike@...ux.intel.com
Subject: Re: UML/man: BLKGETSIZE takes a long, not an int

Hello Nicolas,

> I fear that my bug-report yesterday was very badly written, with me writing
> to the wrong mailing-list and all.
> 
> I was saying:
> 
>> I found a type mismatch in UML that makes host block devices unusable as ubd
>> devices on x86_64 and other 64 bits systems (segfault of the mm subsystem):
>>
>> In block/ioctl.c, the following lines show that the BLKGETSIZE ioctl expects
>> a pointer to a long:
>>
>> 	case BLKGETSIZE:
>> 		if ((bdev->bd_inode->i_size >> 9) > ~0UL)
>> 			return -EFBIG;
>> 		return put_ulong(arg, bdev->bd_inode->i_size >> 9);
>>
>> In arch/um/os-Linux/file.c, os_file_size calls it with an int.
>>
>> The ioctl_list man page should be fixed as well.

manual page changed for 2.65:

--- ioctl_list.2
+++ ioctl_list.2        (working copy)
@@ -243,7 +243,7 @@
 0x0000125D  BLKROSET                   const int *
 0x0000125E  BLKROGET                   int *
 0x0000125F  BLKRRPART                  void
-0x00001260  BLKGETSIZE                 int *
+0x00001260  BLKGETSIZE                 unsigned long *
 0x00001261  BLKFLSBUF                  void
 0x00001262  BLKRASET                   int
 0x00001263  BLKRAGET                   int *

Thanks,

Michael

-- 
Michael Kerrisk
maintainer of Linux man pages Sections 2, 3, 4, 5, and 7

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