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

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Date:	Wed, 06 Oct 2010 07:18:58 -0700
From:	"Venkateswararao Jujjuri (JV)" <jvrao@...ux.vnet.ibm.com>
To:	"Aneesh Kumar K. V" <aneesh.kumar@...ux.vnet.ibm.com>
CC:	Eric Van Hensbergen <ericvh@...il.com>,
	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 10/6/2010 4:03 AM, Aneesh Kumar K. V 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

Yep. This sounds much better. :)

- JV

>
> 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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