linux-kernel - Re: [V9fs-developer] [PATCH 1/3] fs/9p: Update TLCREATE to allow create without open

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Date:	Wed, 6 Oct 2010 10:59:41 -0400
From:	Eric Van Hensbergen <ericvh@...il.com>
To:	"Aneesh Kumar K. V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc:	linux-fsdevel@...r.kernel.org,
	v9fs-developer@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [V9fs-developer] [PATCH 1/3] fs/9p: Update TLCREATE to allow
 create without open

On Wed, Oct 6, 2010 at 7:03 AM, Aneesh Kumar K. V
<aneesh.kumar@...ux.vnet.ibm.com> wrote:
> On Wed, 06 Oct 2010 11:48:15 +0530, "Aneesh Kumar K. V" <aneesh.kumar@...ux.vnet.ibm.com> wrote:
>> On Tue, 5 Oct 2010 13:15:42 -0400, Eric Van Hensbergen <ericvh@...il.com> wrote:
>> > Ouch.  Protocol change.
>> >
>> > Also - not sure I understand what's going on here.  Why does mknod go
>> > through TLCREATE, shouldn't we have our
>> > own protocol messages for mknod?//
>>
>> This is needed for the below mknod usage
>>
>> mknod("k2", S_IFREG) ;
>>
>>
>
> May be a better fix is to make sure we use TLMKNOD instead of TLCREATE
> in case we get a create without LOOKUP_OPEN flags set. So how about
>

Yes, I think that's the better path.  :)

      -eric


> diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
> index 2f904a8..e89754f 100644
> --- a/fs/9p/vfs_inode.c
> +++ b/fs/9p/vfs_inode.c
> @@ -55,6 +55,10 @@ static const struct inode_operations v9fs_file_inode_operations_dotl;
>  static const struct inode_operations v9fs_symlink_inode_operations;
>  static const struct inode_operations v9fs_symlink_inode_operations_dotl;
>
> +static int
> +v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int omode,
> +                   dev_t rdev);
> +
>  /**
>  * unixmode2p9mode - convert unix mode bits to plan 9
>  * @v9ses: v9fs session information
> @@ -681,8 +685,14 @@ v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, int omode,
>        v9ses = v9fs_inode2v9ses(dir);
>        if (nd && nd->flags & LOOKUP_OPEN)
>                flags = nd->intent.open.flags - 1;
> -       else
> -               flags = O_RDWR;
> +       else {
> +               /*
> +                * create call without LOOKUP_OPEN is due
> +                * to mknod of regular files. So use mknod
> +                * operation.
> +                */
> +               return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0);
> +       }
>
>        name = (char *) dentry->d_name.name;
>        P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_create_dotl: name:%s flags:0x%x "
>
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