From: majianpeng <majianpeng@gmail.com>
To: "Jens Axboe" <axboe@kernel.dk>
Cc: linux-kernel <linux-kernel@vger.kernel.org>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>
Subject: Re: Re: For the condition "file->f_mode", when it failed, it should return EACCES rather than EBADF.
Date: Tue, 5 Feb 2013 23:39:44 +0800 [thread overview]
Message-ID: <201302052339385271010@gmail.com> (raw)
In-Reply-To: 20130205132117.GU15092@kernel.dk
>On Sun, Feb 03 2013, majianpeng wrote:
>> Hi all,
>> When I wanted to do discard operations,but i set the openflag was O_RDONLY,it returned a EBADF rather than EACCES or EPERM.
>> I searched the code and found:
>> >case BLKDISCARD:
>> >case BLKSECDISCARD: {
>> > uint64_t range[2];
>>
>> > if (!(mode & FMODE_WRITE))
>> > return -EBADF;
>> Initial i thought there was error.But i searched all code of kernel and found some places like this.
>>
>> The description of EBADF is "Bad file numbe". There are some places where returned EBADF like,
>> >if (!f.file)
>> > return -EBADF;
>>
>> So i think for checking file->f_mode when failed, it should return EACCESS.
>
>But that would break the ABI at this point. I agree with you, though,
>EBADF is not the right error for this case.
>
>--
>Jens Axboe
>
Sorry, can you explain in detail? Why can it break the ABI ?
Thanks!
Jianpeng Ma
next prev parent reply other threads:[~2013-02-05 15:39 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-04 2:07 For the condition "file->f_mode", when it failed, it should return EACCES rather than EBADF majianpeng
2013-02-05 13:21 ` Jens Axboe
2013-02-05 15:39 ` majianpeng [this message]
2013-02-05 20:19 ` Jens Axboe
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