[PATCH] A basic NFSv4 client for 2.5.x

This patch changes the interface of the ->readdir() nfs_rpc_op
so that its first argument is a dentry instead of an inode.

[Explanation: The dentry is required because in NFSv4, we need
 to make use of the _parent_ directory's inode.  This is because
 NFSv4 servers no longer return an entry for ".." in the READDIR
 response, so the client kernel needs to fake this entry, inode
 number and all.]

fs/nfs/dir.c

@@ -107,7 +107,7 @@ int nfs_readdir_filler(nfs_readdir_descriptor_t *desc, struct page *page)
 	dfprintk(VFS, "NFS: nfs_readdir_filler() reading cookie %Lu into page %lu.\n", (long long)desc->entry->cookie, page->index);
 
  again:
-	error = NFS_PROTO(inode)->readdir(inode, cred, desc->entry->cookie, page,
+	error = NFS_PROTO(inode)->readdir(file->f_dentry, cred, desc->entry->cookie, page,
 					  NFS_SERVER(inode)->dtsize, desc->plus);
 	if (error < 0) {
 		/* We requested READDIRPLUS, but the server doesn't grok it */
@@ -341,7 +341,7 @@ int uncached_readdir(nfs_readdir_descriptor_t *desc, void *dirent,
 		status = -ENOMEM;
 		goto out;
 	}
-	desc->error = NFS_PROTO(inode)->readdir(inode, cred, desc->target,
+	desc->error = NFS_PROTO(inode)->readdir(file->f_dentry, cred, desc->target,
 						page,
 						NFS_SERVER(inode)->dtsize,
 						desc->plus);

fs/nfs/nfs3proc.c

@@ -543,9 +543,10 @@ nfs3_proc_rmdir(struct inode *dir, struct qstr *name)
  * readdirplus.
  */
 static int
-nfs3_proc_readdir(struct inode *dir, struct rpc_cred *cred,
+nfs3_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
 		  u64 cookie, struct page *page, unsigned int count, int plus)
 {
+	struct inode		*dir = dentry->d_inode;
 	struct nfs_fattr	dir_attr;
 	u32			*verf = NFS_COOKIEVERF(dir);
 	struct nfs3_readdirargs	arg = {

fs/nfs/proc.c

@@ -425,9 +425,10 @@ nfs_proc_rmdir(struct inode *dir, struct qstr *name)
  * from nfs_readdir by calling the decode_entry function directly.
  */
 static int
-nfs_proc_readdir(struct inode *dir, struct rpc_cred *cred,
+nfs_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
 		 u64 cookie, struct page *page, unsigned int count, int plus)
 {
+	struct inode		*dir = dentry->d_inode;
 	struct nfs_readdirargs	arg = {
 		.fh		= NFS_FH(dir),
 		.cookie		= cookie,

include/linux/nfs_xdr.h

@@ -338,7 +338,7 @@ struct nfs_rpc_ops {
 	int	(*mkdir)   (struct inode *, struct qstr *, struct iattr *,
 			    struct nfs_fh *, struct nfs_fattr *);
 	int	(*rmdir)   (struct inode *, struct qstr *);
-	int	(*readdir) (struct inode *, struct rpc_cred *,
+	int	(*readdir) (struct dentry *, struct rpc_cred *,
 			    u64, struct page *, unsigned int, int);
 	int	(*mknod)   (struct inode *, struct qstr *, struct iattr *,
 			    dev_t, struct nfs_fh *, struct nfs_fattr *);