linux-kernel - Re: [PATCH v5 2/7] vfs: Define new syscalls preadv2,pwritev2

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Date:	Fri, 7 Nov 2014 11:28:17 -0500
From:	Milosz Tanski <milosz@...in.com>
To:	Jeff Moyer <jmoyer@...hat.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Christoph Hellwig <hch@...radead.org>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	"linux-aio@...ck.org" <linux-aio@...ck.org>,
	Mel Gorman <mgorman@...e.de>,
	Volker Lendecke <Volker.Lendecke@...net.de>,
	Tejun Heo <tj@...nel.org>, "Theodore Ts'o" <tytso@....edu>,
	Al Viro <viro@...iv.linux.org.uk>,
	Linux API <linux-api@...r.kernel.org>,
	Michael Kerrisk <mtk.manpages@...il.com>,
	linux-arch@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v5 2/7] vfs: Define new syscalls preadv2,pwritev2

On Thu, Nov 6, 2014 at 6:25 PM, Jeff Moyer <jmoyer@...hat.com> wrote:
> Milosz Tanski <milosz@...in.com> writes:
>
>> New syscalls that take an flag argument. This change does not add any specific
>> flags.
>>
>> Signed-off-by: Milosz Tanski <milosz@...in.com>
>> Reviewed-by: Christoph Hellwig <hch@....de>
>> ---
>>  fs/read_write.c                   | 176 ++++++++++++++++++++++++++++++--------
>>  include/linux/compat.h            |   6 ++
>>  include/linux/syscalls.h          |   6 ++
>>  include/uapi/asm-generic/unistd.h |   6 +-
>>  mm/filemap.c                      |   5 +-
>>  5 files changed, 158 insertions(+), 41 deletions(-)
>>
>> diff --git a/fs/read_write.c b/fs/read_write.c
>> index 94b2d34..907735c 100644
>> --- a/fs/read_write.c
>> +++ b/fs/read_write.c
>> @@ -866,6 +866,8 @@ ssize_t vfs_readv(struct file *file, const struct iovec __user *vec,
>>               return -EBADF;
>>       if (!(file->f_mode & FMODE_CAN_READ))
>>               return -EINVAL;
>> +     if (flags & ~0)
>> +             return -EINVAL;
>>
>>       return do_readv_writev(READ, file, vec, vlen, pos, flags);
>>  }
>> @@ -879,21 +881,23 @@ ssize_t vfs_writev(struct file *file, const struct iovec __user *vec,
>>               return -EBADF;
>>       if (!(file->f_mode & FMODE_CAN_WRITE))
>>               return -EINVAL;
>> +     if (flags & ~0)
>> +             return -EINVAL;
>>
>>       return do_readv_writev(WRITE, file, vec, vlen, pos, flags);
>>  }
>
> Hi, Milosz,
>
> You've checked for invalid flags for the normal system calls, but not
> for the compat variants.  Can you add that in, please?
>
> Thanks!
> Jeff

That's a good catch Jeff I'll fix this and it'll be in the next
version of the patch series.

- M



-- 
Milosz Tanski
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