linux-kernel - [PATCH 22/25] nfs: use i_op->atomic

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Date:	Wed,  7 Mar 2012 22:22:39 +0100
From:	Miklos Szeredi <miklos@...redi.hu>
To:	viro@...IV.linux.org.uk
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	hch@...radead.org, Trond.Myklebust@...app.com, sfrench@...ba.org,
	sage@...dream.net, ericvh@...il.com, mszeredi@...e.cz
Subject: [PATCH 22/25] nfs: use i_op->atomic_create()

From: Miklos Szeredi <mszeredi@...e.cz>

NFS doesn't open the file in ->create, but it does check the LOOKUP_EXCL flag in
it's generic create function.  Convert to using ->atomic_create and checking
O_EXCL so that the nameidata argument is no longer necessary.

Signed-off-by: Miklos Szeredi <mszeredi@...e.cz>
---
 fs/nfs/dir.c |   20 +++++++++-----------
 1 files changed, 9 insertions(+), 11 deletions(-)

diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 36a12b4..887226d 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -47,7 +47,8 @@ static int nfs_opendir(struct inode *, struct file *);
 static int nfs_closedir(struct inode *, struct file *);
 static int nfs_readdir(struct file *, void *, filldir_t);
 static struct dentry *nfs_lookup(struct inode *, struct dentry *, struct nameidata *);
-static int nfs_create(struct inode *, struct dentry *, umode_t, struct nameidata *);
+static struct file *nfs_create(struct inode *, struct dentry *,
+			       struct opendata *, unsigned, umode_t);
 static int nfs_mkdir(struct inode *, struct dentry *, umode_t);
 static int nfs_rmdir(struct inode *, struct dentry *);
 static int nfs_unlink(struct inode *, struct dentry *);
@@ -70,7 +71,7 @@ const struct file_operations nfs_dir_operations = {
 };
 
 const struct inode_operations nfs_dir_inode_operations = {
-	.create		= nfs_create,
+	.atomic_create	= nfs_create,
 	.lookup		= nfs_lookup,
 	.link		= nfs_link,
 	.unlink		= nfs_unlink,
@@ -90,7 +91,7 @@ const struct address_space_operations nfs_dir_aops = {
 
 #ifdef CONFIG_NFS_V3
 const struct inode_operations nfs3_dir_inode_operations = {
-	.create		= nfs_create,
+	.atomic_create	= nfs_create,
 	.lookup		= nfs_lookup,
 	.link		= nfs_link,
 	.unlink		= nfs_unlink,
@@ -1577,12 +1578,12 @@ out_error:
  * that the operation succeeded on the server, but an error in the
  * reply path made it appear to have failed.
  */
-static int nfs_create(struct inode *dir, struct dentry *dentry,
-		umode_t mode, struct nameidata *nd)
+static struct file *nfs_create(struct inode *dir, struct dentry *dentry,
+			       struct opendata *od, unsigned open_flags,
+			       umode_t mode)
 {
 	struct iattr attr;
 	int error;
-	int open_flags = O_CREAT|O_EXCL;
 
 	dfprintk(VFS, "NFS: create(%s/%ld), %s\n",
 			dir->i_sb->s_id, dir->i_ino, dentry->d_name.name);
@@ -1590,16 +1591,13 @@ static int nfs_create(struct inode *dir, struct dentry *dentry,
 	attr.ia_mode = mode;
 	attr.ia_valid = ATTR_MODE;
 
-	if (nd && !(nd->flags & LOOKUP_EXCL))
-		open_flags = O_CREAT;
-
 	error = NFS_PROTO(dir)->create(dir, dentry, &attr, open_flags);
 	if (error != 0)
 		goto out_err;
-	return 0;
+	return NULL;
 out_err:
 	d_drop(dentry);
-	return error;
+	return ERR_PTR(error);
 }
 
 /*
-- 
1.7.7

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