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

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Message-ID: <m3wrpvinvv.fsf@linux.vnet.ibm.com>
Date:	Wed, 06 Oct 2010 16:33:48 +0530
From:	"Aneesh Kumar K. V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	Eric Van Hensbergen <ericvh@...il.com>
Cc:	v9fs-developer@...ts.sourceforge.net,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [V9fs-developer] [PATCH 1/3] fs/9p: Update TLCREATE to allow create without open

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

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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