From: Chandan Rajendra <chandan@linux.vnet.ibm.com>
To: xuw2015@gmail.com
Cc: linux-btrfs@vger.kernel.org
Subject: Re: [PATCH] btrfs-progs: fix btrfs quota rescan failed on PPC64 arch
Date: Thu, 23 Apr 2015 22:43:29 +0530 [thread overview]
Message-ID: <4064896.UsZQ5YB6B2@localhost.localdomain> (raw)
In-Reply-To: <1429507996-28224-1-git-send-email-xuw2015@gmail.com>
On Monday 20 Apr 2015 13:33:16 xuw2015@gmail.com wrote:
> From: George Wang <xuw2015@gmail.com>
>
> PPC64 arch use such following IOC values "
> \#define _IOC_NONE 1U
> \#define _IOC_READ 2U
> \#define _IOC_WRITE 4U
> " comparing to the default IOC values "
> \#define _IOC_NONE 0U
> \#define _IOC_READ 2U
> \#define _IOC_WRITE 1U"
>
> This means the value "_IOW*" will be negative when we store it in the int
> variables. Such as the "BTRFS_IOC_QGROUP_CREATE", it will be "0x4010942e" on
> X86_64, but "0x8010942e" on PPC64.
> Notice that the IOC values are the "unsigned long" type, so we use the
> "unsigned long" to store it, and this can insure the comparison between the
> variable and BTRFS_IOC_* valid.
>
> Signed-off-by: George Wang <xuw2015@gmail.com>
Tested-by: Chandan Rajendra <chandan@linux.vnet.ibm.com>
--
chandan
next prev parent reply other threads:[~2015-04-23 17:14 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-20 5:33 [PATCH] btrfs-progs: fix btrfs quota rescan failed on PPC64 arch xuw2015
2015-04-20 14:47 ` Eric Sandeen
2015-04-21 2:26 ` 王旭
2015-04-22 16:04 ` David Sterba
2015-04-23 17:13 ` Chandan Rajendra [this message]
2015-04-24 13:42 ` David Sterba
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