NFSv2/v3/v4: Place NFS nfs_page shared data into a single structure

   that hangs off filp->private_data. As a side effect, this also
   cleans up the NFSv4 private file state info.
Signed-off-by: Trond Myklebust <trond.myklebust@fys.uio.no>

fs/nfs/direct.c

@@ -110,7 +110,7 @@ nfs_free_user_pages(struct page **pages, int npages, int do_dirty)
  * nfs_direct_read_seg - Read in one iov segment.  Generate separate
  *                        read RPCs for each "rsize" bytes.
  * @inode: target inode
- * @file: target file (may be NULL)
+ * @ctx: target file open context
  * user_addr: starting address of this segment of user's buffer
  * count: size of this segment
  * file_offset: offset in file to begin the operation
@@ -118,7 +118,7 @@ nfs_free_user_pages(struct page **pages, int npages, int do_dirty)
  * nr_pages: size of pages array
  */
 static int
-nfs_direct_read_seg(struct inode *inode, struct file *file,
+nfs_direct_read_seg(struct inode *inode, struct nfs_open_context *ctx,
 		unsigned long user_addr, size_t count, loff_t file_offset,
 		struct page **pages, int nr_pages)
 {
@@ -127,9 +127,11 @@ nfs_direct_read_seg(struct inode *inode, struct file *file,
 	int curpage = 0;
 	struct nfs_read_data	rdata = {
 		.inode		= inode,
+		.cred		= ctx->cred,
 		.args		= {
 			.fh		= NFS_FH(inode),
-			.lockowner	= current->files,
+			.lockowner	= ctx->lockowner,
+			.state		= ctx->state,
 		},
 		.res		= {
 			.fattr		= &rdata.fattr,
@@ -151,7 +153,7 @@ nfs_direct_read_seg(struct inode *inode, struct file *file,
 			user_addr + tot_bytes, rdata.args.pgbase, curpage);
 
 		lock_kernel();
-		result = NFS_PROTO(inode)->read(&rdata, file);
+		result = NFS_PROTO(inode)->read(&rdata);
 		unlock_kernel();
 
 		if (result <= 0) {
@@ -183,7 +185,7 @@ nfs_direct_read_seg(struct inode *inode, struct file *file,
  * nfs_direct_read - For each iov segment, map the user's buffer
  *                   then generate read RPCs.
  * @inode: target inode
- * @file: target file (may be NULL)
+ * @ctx: target file open context
  * @iov: array of vectors that define I/O buffer
  * file_offset: offset in file to begin the operation
  * nr_segs: size of iovec array
@@ -193,7 +195,7 @@ nfs_direct_read_seg(struct inode *inode, struct file *file,
  * server.
  */
 static ssize_t
-nfs_direct_read(struct inode *inode, struct file *file,
+nfs_direct_read(struct inode *inode, struct nfs_open_context *ctx,
 		const struct iovec *iov, loff_t file_offset,
 		unsigned long nr_segs)
 {
@@ -216,7 +218,7 @@ nfs_direct_read(struct inode *inode, struct file *file,
                         return page_count;
                 }
 
-		result = nfs_direct_read_seg(inode, file, user_addr, size,
+		result = nfs_direct_read_seg(inode, ctx, user_addr, size,
 				file_offset, pages, page_count);
 
 		nfs_free_user_pages(pages, page_count, 1);
@@ -239,7 +241,7 @@ nfs_direct_read(struct inode *inode, struct file *file,
  * nfs_direct_write_seg - Write out one iov segment.  Generate separate
  *                        write RPCs for each "wsize" bytes, then commit.
  * @inode: target inode
- * @file: target file (may be NULL)
+ * @ctx: target file open context
  * user_addr: starting address of this segment of user's buffer
  * count: size of this segment
  * file_offset: offset in file to begin the operation
@@ -247,7 +249,7 @@ nfs_direct_read(struct inode *inode, struct file *file,
  * nr_pages: size of pages array
  */
 static int
-nfs_direct_write_seg(struct inode *inode, struct file *file,
+nfs_direct_write_seg(struct inode *inode, struct nfs_open_context *ctx,
 		unsigned long user_addr, size_t count, loff_t file_offset,
 		struct page **pages, int nr_pages)
 {
@@ -257,9 +259,11 @@ nfs_direct_write_seg(struct inode *inode, struct file *file,
 	struct nfs_writeverf first_verf;
 	struct nfs_write_data	wdata = {
 		.inode		= inode,
+		.cred		= ctx->cred,
 		.args		= {
 			.fh		= NFS_FH(inode),
-			.lockowner	= current->files,
+			.lockowner	= ctx->lockowner,
+			.state		= ctx->state,
 		},
 		.res		= {
 			.fattr		= &wdata.fattr,
@@ -290,7 +294,7 @@ nfs_direct_write_seg(struct inode *inode, struct file *file,
 			user_addr + tot_bytes, wdata.args.pgbase, curpage);
 
 		lock_kernel();
-		result = NFS_PROTO(inode)->write(&wdata, file);
+		result = NFS_PROTO(inode)->write(&wdata);
 		unlock_kernel();
 
 		if (result <= 0) {
@@ -325,7 +329,7 @@ nfs_direct_write_seg(struct inode *inode, struct file *file,
 		wdata.args.offset = file_offset;
 
 		lock_kernel();
-		result = NFS_PROTO(inode)->commit(&wdata, file);
+		result = NFS_PROTO(inode)->commit(&wdata);
 		unlock_kernel();
 
 		if (result < 0 || memcmp(&first_verf.verifier,
@@ -349,7 +353,7 @@ nfs_direct_write_seg(struct inode *inode, struct file *file,
  * nfs_direct_write - For each iov segment, map the user's buffer
  *                    then generate write and commit RPCs.
  * @inode: target inode
- * @file: target file (may be NULL)
+ * @ctx: target file open context
  * @iov: array of vectors that define I/O buffer
  * file_offset: offset in file to begin the operation
  * nr_segs: size of iovec array
@@ -358,8 +362,7 @@ nfs_direct_write_seg(struct inode *inode, struct file *file,
  * that non-direct readers might access, so they will pick up these
  * writes immediately.
  */
-static ssize_t
-nfs_direct_write(struct inode *inode, struct file *file,
+static int nfs_direct_write(struct inode *inode, struct nfs_open_context *ctx,
 		const struct iovec *iov, loff_t file_offset,
 		unsigned long nr_segs)
 {
@@ -382,7 +385,7 @@ nfs_direct_write(struct inode *inode, struct file *file,
                         return page_count;
                 }
 
-		result = nfs_direct_write_seg(inode, file, user_addr, size,
+		result = nfs_direct_write_seg(inode, ctx, user_addr, size,
 				file_offset, pages, page_count);
 		nfs_free_user_pages(pages, page_count, 0);
 
@@ -414,6 +417,7 @@ nfs_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
 {
 	ssize_t result = -EINVAL;
 	struct file *file = iocb->ki_filp;
+	struct nfs_open_context *ctx;
 	struct dentry *dentry = file->f_dentry;
 	struct inode *inode = dentry->d_inode;
 
@@ -423,19 +427,20 @@ nfs_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
 	if (!is_sync_kiocb(iocb))
 		return result;
 
+	ctx = (struct nfs_open_context *)file->private_data;
 	switch (rw) {
 	case READ:
 		dprintk("NFS: direct_IO(read) (%s) off/no(%Lu/%lu)\n",
 				dentry->d_name.name, file_offset, nr_segs);
 
-		result = nfs_direct_read(inode, file, iov,
+		result = nfs_direct_read(inode, ctx, iov,
 						file_offset, nr_segs);
 		break;
 	case WRITE:
 		dprintk("NFS: direct_IO(write) (%s) off/no(%Lu/%lu)\n",
 				dentry->d_name.name, file_offset, nr_segs);
 
-		result = nfs_direct_write(inode, file, iov,
+		result = nfs_direct_write(inode, ctx, iov,
 						file_offset, nr_segs);
 		break;
 	default:
@@ -471,6 +476,8 @@ nfs_file_direct_read(struct kiocb *iocb, char __user *buf, size_t count, loff_t
 	ssize_t retval = -EINVAL;
 	loff_t *ppos = &iocb->ki_pos;
 	struct file *file = iocb->ki_filp;
+	struct nfs_open_context *ctx =
+			(struct nfs_open_context *) file->private_data;
 	struct dentry *dentry = file->f_dentry;
 	struct address_space *mapping = file->f_mapping;
 	struct inode *inode = mapping->host;
@@ -502,7 +509,7 @@ nfs_file_direct_read(struct kiocb *iocb, char __user *buf, size_t count, loff_t
 			goto out;
 	}
 
-	retval = nfs_direct_read(inode, file, &iov, pos, 1);
+	retval = nfs_direct_read(inode, ctx, &iov, pos, 1);
 	if (retval > 0)
 		*ppos = pos + retval;
 
@@ -542,6 +549,8 @@ nfs_file_direct_write(struct kiocb *iocb, const char __user *buf, size_t count,
 	loff_t *ppos = &iocb->ki_pos;
 	unsigned long limit = current->rlim[RLIMIT_FSIZE].rlim_cur;
 	struct file *file = iocb->ki_filp;
+	struct nfs_open_context *ctx =
+			(struct nfs_open_context *) file->private_data;
 	struct dentry *dentry = file->f_dentry;
 	struct address_space *mapping = file->f_mapping;
 	struct inode *inode = mapping->host;
@@ -589,7 +598,7 @@ nfs_file_direct_write(struct kiocb *iocb, const char __user *buf, size_t count,
 			goto out;
 	}
 
-	retval = nfs_direct_write(inode, file, &iov, pos, 1);
+	retval = nfs_direct_write(inode, ctx, &iov, pos, 1);
 	if (mapping->nrpages)
 		invalidate_inode_pages2(mapping);
 	if (retval > 0)

fs/nfs/file.c

@@ -113,6 +113,7 @@ nfs_file_release(struct inode *inode, struct file *filp)
 static int
 nfs_file_flush(struct file *file)
 {
+	struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data;
 	struct inode	*inode = file->f_dentry->d_inode;
 	int		status;
 
@@ -124,8 +125,8 @@ nfs_file_flush(struct file *file)
 	/* Ensure that data+attribute caches are up to date after close() */
 	status = nfs_wb_all(inode);
 	if (!status) {
-		status = file->f_error;
-		file->f_error = 0;
+		status = ctx->error;
+		ctx->error = 0;
 		if (!status)
 			__nfs_revalidate_inode(NFS_SERVER(inode), inode);
 	}
@@ -197,6 +198,7 @@ nfs_file_mmap(struct file * file, struct vm_area_struct * vma)
 static int
 nfs_fsync(struct file *file, struct dentry *dentry, int datasync)
 {
+	struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data;
 	struct inode *inode = dentry->d_inode;
 	int status;
 
@@ -205,8 +207,8 @@ nfs_fsync(struct file *file, struct dentry *dentry, int datasync)
 	lock_kernel();
 	status = nfs_wb_all(inode);
 	if (!status) {
-		status = file->f_error;
-		file->f_error = 0;
+		status = ctx->error;
+		ctx->error = 0;
 	}
 	unlock_kernel();
 	return status;

fs/nfs/inode.c

@@ -121,8 +121,9 @@ nfs_delete_inode(struct inode * inode)
 {
 	dprintk("NFS: delete_inode(%s/%ld)\n", inode->i_sb->s_id, inode->i_ino);
 
+	nfs_wb_all(inode);
 	/*
-	 * The following can never actually happen...
+	 * The following should never happen...
 	 */
 	if (nfs_have_writebacks(inode)) {
 		printk(KERN_ERR "nfs_delete_inode: inode %ld has pending RPC requests\n", inode->i_ino);
@@ -139,10 +140,10 @@ static void
 nfs_clear_inode(struct inode *inode)
 {
 	struct nfs_inode *nfsi = NFS_I(inode);
-	struct rpc_cred *cred = nfsi->mm_cred;
+	struct rpc_cred *cred;
 
-	if (cred)
-		put_rpccred(cred);
+	nfs_wb_all(inode);
+	BUG_ON (!list_empty(&nfsi->open_files));
 	cred = nfsi->cache_access.cred;
 	if (cred)
 		put_rpccred(cred);
@@ -812,53 +813,114 @@ int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
 	return err;
 }
 
+struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, struct rpc_cred *cred)
+{
+	struct nfs_open_context *ctx;
+
+	ctx = (struct nfs_open_context *)kmalloc(sizeof(*ctx), GFP_KERNEL);
+	if (ctx != NULL) {
+		atomic_set(&ctx->count, 1);
+		ctx->dentry = dget(dentry);
+		ctx->cred = get_rpccred(cred);
+		ctx->state = NULL;
+		ctx->lockowner = current->files;
+		ctx->error = 0;
+		init_waitqueue_head(&ctx->waitq);
+	}
+	return ctx;
+}
+
+struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
+{
+	if (ctx != NULL)
+		atomic_inc(&ctx->count);
+	return ctx;
+}
+
+void put_nfs_open_context(struct nfs_open_context *ctx)
+{
+	if (atomic_dec_and_test(&ctx->count)) {
+		if (ctx->state != NULL)
+			nfs4_close_state(ctx->state, ctx->mode);
+		if (ctx->cred != NULL)
+			put_rpccred(ctx->cred);
+		dput(ctx->dentry);
+		kfree(ctx);
+	}
+}
+
 /*
  * Ensure that mmap has a recent RPC credential for use when writing out
  * shared pages
  */
-void
-nfs_set_mmcred(struct inode *inode, struct rpc_cred *cred)
+void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
 {
-	struct rpc_cred **p = &NFS_I(inode)->mm_cred,
-			*oldcred = *p;
+	struct inode *inode = filp->f_dentry->d_inode;
+	struct nfs_inode *nfsi = NFS_I(inode);
 
-	*p = get_rpccred(cred);
-	if (oldcred)
-		put_rpccred(oldcred);
+	filp->private_data = get_nfs_open_context(ctx);
+	spin_lock(&inode->i_lock);
+	list_add(&ctx->list, &nfsi->open_files);
+	spin_unlock(&inode->i_lock);
+}
+
+struct nfs_open_context *nfs_find_open_context(struct inode *inode, int mode)
+{
+	struct nfs_inode *nfsi = NFS_I(inode);
+	struct nfs_open_context *pos, *ctx = NULL;
+
+	spin_lock(&inode->i_lock);
+	list_for_each_entry(pos, &nfsi->open_files, list) {
+		if ((pos->mode & mode) == mode) {
+			ctx = get_nfs_open_context(pos);
+			break;
+		}
+	}
+	spin_unlock(&inode->i_lock);
+	return ctx;
+}
+
+void nfs_file_clear_open_context(struct file *filp)
+{
+	struct inode *inode = filp->f_dentry->d_inode;
+	struct nfs_open_context *ctx = (struct nfs_open_context *)filp->private_data;
+
+	if (ctx) {
+		filp->private_data = NULL;
+		spin_lock(&inode->i_lock);
+		list_del(&ctx->list);
+		spin_unlock(&inode->i_lock);
+		put_nfs_open_context(ctx);
+	}
 }
 
 /*
- * These are probably going to contain hooks for
- * allocating and releasing RPC credentials for
- * the file. I'll have to think about Tronds patch
- * a bit more..
+ * These allocate and release file read/write context information.
  */
 int nfs_open(struct inode *inode, struct file *filp)
 {
-	struct rpc_auth *auth;
+	struct nfs_open_context *ctx;
 	struct rpc_cred *cred;
 
-	auth = NFS_CLIENT(inode)->cl_auth;
-	cred = rpcauth_lookupcred(auth, 0);
-	filp->private_data = cred;
-	if ((filp->f_mode & FMODE_WRITE) != 0) {
-		nfs_set_mmcred(inode, cred);
+	if ((cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0)) == NULL)
+		return -ENOMEM;
+	ctx = alloc_nfs_open_context(filp->f_dentry, cred);
+	put_rpccred(cred);
+	if (ctx == NULL)
+		return -ENOMEM;
+	ctx->mode = filp->f_mode;
+	nfs_file_set_open_context(filp, ctx);
+	put_nfs_open_context(ctx);
+	if ((filp->f_mode & FMODE_WRITE) != 0)
 		nfs_begin_data_update(inode);
-	}
 	return 0;
 }
 
 int nfs_release(struct inode *inode, struct file *filp)
 {
-	struct rpc_cred *cred;
-
-	lock_kernel();
 	if ((filp->f_mode & FMODE_WRITE) != 0)
 		nfs_end_data_update(inode);
-	cred = nfs_file_cred(filp);
-	if (cred)
-		put_rpccred(cred);
-	unlock_kernel();
+	nfs_file_clear_open_context(filp);
 	return 0;
 }
 
@@ -1397,6 +1459,9 @@ static void nfs4_clear_inode(struct inode *inode)
 {
 	struct nfs_inode *nfsi = NFS_I(inode);
 
+	/* First call standard NFS clear_inode() code */
+	nfs_clear_inode(inode);
+	/* Now clear out any remaining state */
 	while (!list_empty(&nfsi->open_states)) {
 		struct nfs4_state *state;
 		
@@ -1411,8 +1476,6 @@ static void nfs4_clear_inode(struct inode *inode)
 		BUG_ON(atomic_read(&state->count) != 1);
 		nfs4_close_state(state, state->state);
 	}
-	/* Now call standard NFS clear_inode() code */
-	nfs_clear_inode(inode);
 }
 
 
@@ -1717,7 +1780,6 @@ static struct inode *nfs_alloc_inode(struct super_block *sb)
 	if (!nfsi)
 		return NULL;
 	nfsi->flags = 0;
-	nfsi->mm_cred = NULL;
 	nfs4_zero_state(nfsi);
 	return &nfsi->vfs_inode;
 }
@@ -1737,6 +1799,7 @@ static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
 		spin_lock_init(&nfsi->req_lock);
 		INIT_LIST_HEAD(&nfsi->dirty);
 		INIT_LIST_HEAD(&nfsi->commit);
+		INIT_LIST_HEAD(&nfsi->open_files);
 		INIT_RADIX_TREE(&nfsi->nfs_page_tree, GFP_ATOMIC);
 		atomic_set(&nfsi->data_updates, 0);
 		nfsi->ndirty = 0;

fs/nfs/nfs3proc.c

@@ -68,18 +68,6 @@ nfs3_async_handle_jukebox(struct rpc_task *task)
 	return 1;
 }
 
-static struct rpc_cred *
-nfs_cred(struct inode *inode, struct file *filp)
-{
-	struct rpc_cred *cred = NULL;
-
-	if (filp)
-		cred = (struct rpc_cred *)filp->private_data;
-	if (!cred)
-		cred = NFS_I(inode)->mm_cred;
-	return cred;
-}
-
 /*
  * Bare-bones access to getattr: this is for nfs_read_super.
  */
@@ -233,8 +221,7 @@ nfs3_proc_readlink(struct inode *inode, struct page *page)
 	return status;
 }
 
-static int
-nfs3_proc_read(struct nfs_read_data *rdata, struct file *filp)
+static int nfs3_proc_read(struct nfs_read_data *rdata)
 {
 	int			flags = rdata->flags;
 	struct inode *		inode = rdata->inode;
@@ -243,13 +230,13 @@ nfs3_proc_read(struct nfs_read_data *rdata, struct file *filp)
 		.rpc_proc	= &nfs3_procedures[NFS3PROC_READ],
 		.rpc_argp	= &rdata->args,
 		.rpc_resp	= &rdata->res,
+		.rpc_cred	= rdata->cred,
 	};
 	int			status;
 
 	dprintk("NFS call  read %d @ %Ld\n", rdata->args.count,
 			(long long) rdata->args.offset);
 	fattr->valid = 0;
-	msg.rpc_cred = nfs_cred(inode, filp);
 	status = rpc_call_sync(NFS_CLIENT(inode), &msg, flags);
 	if (status >= 0)
 		nfs_refresh_inode(inode, fattr);
@@ -257,8 +244,7 @@ nfs3_proc_read(struct nfs_read_data *rdata, struct file *filp)
 	return status;
 }
 
-static int
-nfs3_proc_write(struct nfs_write_data *wdata, struct file *filp)
+static int nfs3_proc_write(struct nfs_write_data *wdata)
 {
 	int			rpcflags = wdata->flags;
 	struct inode *		inode = wdata->inode;
@@ -267,13 +253,13 @@ nfs3_proc_write(struct nfs_write_data *wdata, struct file *filp)
 		.rpc_proc	= &nfs3_procedures[NFS3PROC_WRITE],
 		.rpc_argp	= &wdata->args,
 		.rpc_resp	= &wdata->res,
+		.rpc_cred	= wdata->cred,
 	};
 	int			status;
 
 	dprintk("NFS call  write %d @ %Ld\n", wdata->args.count,
 			(long long) wdata->args.offset);
 	fattr->valid = 0;
-	msg.rpc_cred = nfs_cred(inode, filp);
 	status = rpc_call_sync(NFS_CLIENT(inode), &msg, rpcflags);
 	if (status >= 0)
 		nfs_refresh_inode(inode, fattr);
@@ -281,8 +267,7 @@ nfs3_proc_write(struct nfs_write_data *wdata, struct file *filp)
 	return status < 0? status : wdata->res.count;
 }
 
-static int
-nfs3_proc_commit(struct nfs_write_data *cdata, struct file *filp)
+static int nfs3_proc_commit(struct nfs_write_data *cdata)
 {
 	struct inode *		inode = cdata->inode;
 	struct nfs_fattr *	fattr = cdata->res.fattr;
@@ -290,13 +275,13 @@ nfs3_proc_commit(struct nfs_write_data *cdata, struct file *filp)
 		.rpc_proc	= &nfs3_procedures[NFS3PROC_COMMIT],
 		.rpc_argp	= &cdata->args,
 		.rpc_resp	= &cdata->res,
+		.rpc_cred	= cdata->cred,
 	};
 	int			status;
 
 	dprintk("NFS call  commit %d @ %Ld\n", cdata->args.count,
 			(long long) cdata->args.offset);
 	fattr->valid = 0;
-	msg.rpc_cred = nfs_cred(inode, filp);
 	status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
 	if (status >= 0)
 		nfs_refresh_inode(inode, fattr);
@@ -840,27 +825,6 @@ nfs3_proc_commit_setup(struct nfs_write_data *data, int how)
 	rpc_call_setup(task, &msg, 0);
 }
 
-/*
- * Set up the nfspage struct with the right credentials
- */
-void
-nfs3_request_init(struct nfs_page *req, struct file *filp)
-{
-	req->wb_cred = get_rpccred(nfs_cred(req->wb_inode, filp));
-}
-
-static int
-nfs3_request_compatible(struct nfs_page *req, struct file *filp, struct page *page)
-{
-	if (req->wb_file != filp)
-		return 0;
-	if (req->wb_page != page)
-		return 0;
-	if (req->wb_cred != nfs_file_cred(filp))
-		return 0;
-	return 1;
-}
-
 static int
 nfs3_proc_lock(struct file *filp, int cmd, struct file_lock *fl)
 {
@@ -900,7 +864,5 @@ struct nfs_rpc_ops	nfs_v3_clientops = {
 	.commit_setup	= nfs3_proc_commit_setup,
 	.file_open	= nfs_open,
 	.file_release	= nfs_release,
-	.request_init	= nfs3_request_init,
-	.request_compatible = nfs3_request_compatible,
 	.lock		= nfs3_proc_lock,
 };

fs/nfs/nfs4proc.c

@@ -975,7 +975,7 @@ static int nfs4_proc_readlink(struct inode *inode, struct page *page)
 	return err;
 }
 
-static int _nfs4_proc_read(struct nfs_read_data *rdata, struct file *filp)
+static int _nfs4_proc_read(struct nfs_read_data *rdata)
 {
 	int flags = rdata->flags;
 	struct inode *inode = rdata->inode;
@@ -985,6 +985,7 @@ static int _nfs4_proc_read(struct nfs_read_data *rdata, struct file *filp)
 		.rpc_proc	= &nfs4_procedures[NFSPROC4_CLNT_READ],
 		.rpc_argp	= &rdata->args,
 		.rpc_resp	= &rdata->res,
+		.rpc_cred	= rdata->cred,
 	};
 	unsigned long timestamp = jiffies;
 	int status;
@@ -992,19 +993,6 @@ static int _nfs4_proc_read(struct nfs_read_data *rdata, struct file *filp)
 	dprintk("NFS call  read %d @ %Ld\n", rdata->args.count,
 			(long long) rdata->args.offset);
 
-	/*
-	 * Try first to use O_RDONLY, then O_RDWR stateid.
-	 */
-	if (filp) {
-		struct nfs4_state *state;
-		state = (struct nfs4_state *)filp->private_data;
-		rdata->args.state = state;
-		msg.rpc_cred = state->owner->so_cred;
-	} else {
-		rdata->args.state = NULL;
-		msg.rpc_cred = NFS_I(inode)->mm_cred;
-	}
-
 	fattr->valid = 0;
 	status = rpc_call_sync(server->client, &msg, flags);
 	if (!status)
@@ -1013,19 +1001,19 @@ static int _nfs4_proc_read(struct nfs_read_data *rdata, struct file *filp)
 	return status;
 }
 
-static int nfs4_proc_read(struct nfs_read_data *rdata, struct file *filp)
+static int nfs4_proc_read(struct nfs_read_data *rdata)
 {
 	struct nfs4_exception exception = { };
 	int err;
 	do {
 		err = nfs4_handle_exception(NFS_SERVER(rdata->inode),
-				_nfs4_proc_read(rdata, filp),
+				_nfs4_proc_read(rdata),
 				&exception);
 	} while (exception.retry);
 	return err;
 }
 
-static int _nfs4_proc_write(struct nfs_write_data *wdata, struct file *filp)
+static int _nfs4_proc_write(struct nfs_write_data *wdata)
 {
 	int rpcflags = wdata->flags;
 	struct inode *inode = wdata->inode;
@@ -1035,44 +1023,32 @@ static int _nfs4_proc_write(struct nfs_write_data *wdata, struct file *filp)
 		.rpc_proc	= &nfs4_procedures[NFSPROC4_CLNT_WRITE],
 		.rpc_argp	= &wdata->args,
 		.rpc_resp	= &wdata->res,
+		.rpc_cred	= wdata->cred,
 	};
 	int status;
 
 	dprintk("NFS call  write %d @ %Ld\n", wdata->args.count,
 			(long long) wdata->args.offset);
 
-	/*
-	 * Try first to use O_WRONLY, then O_RDWR stateid.
-	 */
-	if (filp) {
-		struct nfs4_state *state;
-		state = (struct nfs4_state *)filp->private_data;
-		wdata->args.state = state;
-		msg.rpc_cred = state->owner->so_cred;
-	} else {
-		wdata->args.state = NULL;
-		msg.rpc_cred = NFS_I(inode)->mm_cred;
-	}
-
 	fattr->valid = 0;
 	status = rpc_call_sync(server->client, &msg, rpcflags);
 	dprintk("NFS reply write: %d\n", status);
 	return status;
 }
 
-static int nfs4_proc_write(struct nfs_write_data *wdata, struct file *filp)
+static int nfs4_proc_write(struct nfs_write_data *wdata)
 {
 	struct nfs4_exception exception = { };
 	int err;
 	do {
 		err = nfs4_handle_exception(NFS_SERVER(wdata->inode),
-				_nfs4_proc_write(wdata, filp),
+				_nfs4_proc_write(wdata),
 				&exception);
 	} while (exception.retry);
 	return err;
 }
 
-static int _nfs4_proc_commit(struct nfs_write_data *cdata, struct file *filp)
+static int _nfs4_proc_commit(struct nfs_write_data *cdata)
 {
 	struct inode *inode = cdata->inode;
 	struct nfs_fattr *fattr = cdata->res.fattr;
@@ -1081,33 +1057,26 @@ static int _nfs4_proc_commit(struct nfs_write_data *cdata, struct file *filp)
 		.rpc_proc	= &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
 		.rpc_argp	= &cdata->args,
 		.rpc_resp	= &cdata->res,
+		.rpc_cred	= cdata->cred,
 	};
 	int status;
 
 	dprintk("NFS call  commit %d @ %Ld\n", cdata->args.count,
 			(long long) cdata->args.offset);
 
-	/*
-	 * Try first to use O_WRONLY, then O_RDWR stateid.
-	 */
-	if (filp)
-		msg.rpc_cred = ((struct nfs4_state *)filp->private_data)->owner->so_cred;
-	else
-		msg.rpc_cred = NFS_I(inode)->mm_cred;
-
 	fattr->valid = 0;
 	status = rpc_call_sync(server->client, &msg, 0);
 	dprintk("NFS reply commit: %d\n", status);
 	return status;
 }
 
-static int nfs4_proc_commit(struct nfs_write_data *cdata, struct file *filp)
+static int nfs4_proc_commit(struct nfs_write_data *cdata)
 {
 	struct nfs4_exception exception = { };
 	int err;
 	do {
 		err = nfs4_handle_exception(NFS_SERVER(cdata->inode),
-				_nfs4_proc_commit(cdata, filp),
+				_nfs4_proc_commit(cdata),
 				&exception);
 	} while (exception.retry);
 	return err;
@@ -1797,8 +1766,10 @@ static int
 nfs4_proc_file_open(struct inode *inode, struct file *filp)
 {
 	struct dentry *dentry = filp->f_dentry;
-	struct nfs4_state *state;
+	struct nfs_open_context *ctx;
+	struct nfs4_state *state = NULL;
 	struct rpc_cred *cred;
+	int status = -ENOMEM;
 
 	dprintk("nfs4_proc_file_open: starting on (%.*s/%.*s)\n",
 	                       (int)dentry->d_parent->d_name.len,
@@ -1808,21 +1779,28 @@ nfs4_proc_file_open(struct inode *inode, struct file *filp)
 
 	/* Find our open stateid */
 	cred = rpcauth_lookupcred(NFS_SERVER(inode)->client->cl_auth, 0);
-	state = nfs4_find_state(inode, cred, filp->f_mode);
+	if (unlikely(cred == NULL))
+		return -ENOMEM;
+	ctx = alloc_nfs_open_context(dentry, cred);
 	put_rpccred(cred);
-	if (state == NULL) {
-		printk(KERN_WARNING "NFS: v4 raced in function %s\n", __FUNCTION__);
-		return -EIO; /* ERACE actually */
-	}
+	if (unlikely(ctx == NULL))
+		return -ENOMEM;
+	status = -EIO; /* ERACE actually */
+	state = nfs4_find_state(inode, cred, filp->f_mode);
+	if (unlikely(state == NULL))
+		goto no_state;
+	ctx->state = state;
 	nfs4_close_state(state, filp->f_mode);
-	if (filp->f_mode & FMODE_WRITE) {
-		lock_kernel();
-		nfs_set_mmcred(inode, state->owner->so_cred);
+	ctx->mode = filp->f_mode;
+	nfs_file_set_open_context(filp, ctx);
+	put_nfs_open_context(ctx);
+	if (filp->f_mode & FMODE_WRITE)
 		nfs_begin_data_update(inode);
-		unlock_kernel();
-	}
-	filp->private_data = state;
 	return 0;
+no_state:
+	printk(KERN_WARNING "NFS: v4 raced in function %s\n", __FUNCTION__);
+	put_nfs_open_context(ctx);
+	return status;
 }
 
 /*
@@ -1831,37 +1809,12 @@ nfs4_proc_file_open(struct inode *inode, struct file *filp)
 static int
 nfs4_proc_file_release(struct inode *inode, struct file *filp)
 {
-	struct nfs4_state *state = (struct nfs4_state *)filp->private_data;
-
-	if (state)
-		nfs4_close_state(state, filp->f_mode);
-	if (filp->f_mode & FMODE_WRITE) {
-		lock_kernel();
+	if (filp->f_mode & FMODE_WRITE)
 		nfs_end_data_update(inode);
-		unlock_kernel();
-	}
+	nfs_file_clear_open_context(filp);
 	return 0;
 }
 
-/*
- * Set up the nfspage struct with the right state info and credentials
- */
-static void
-nfs4_request_init(struct nfs_page *req, struct file *filp)
-{
-	struct nfs4_state *state;
-
-	if (!filp) {
-		req->wb_cred = get_rpccred(NFS_I(req->wb_inode)->mm_cred);
-		req->wb_state = NULL;
-		return;
-	}
-	state = (struct nfs4_state *)filp->private_data;
-	req->wb_state = state;
-	req->wb_cred = get_rpccred(state->owner->so_cred);
-	req->wb_lockowner = current->files;
-}
-
 static int
 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server)
 {
@@ -1974,28 +1927,6 @@ int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_
 	return nfs4_map_errors(ret);
 }
 
-
-static int
-nfs4_request_compatible(struct nfs_page *req, struct file *filp, struct page *page)
-{
-	struct nfs4_state *state = NULL;
-	struct rpc_cred *cred = NULL;
-
-	if (req->wb_file != filp)
-		return 0;
-	if (req->wb_page != page)
-		return 0;
-	state = (struct nfs4_state *)filp->private_data;
-	if (req->wb_state != state)
-		return 0;
-	if (req->wb_lockowner != current->files)
-		return 0;
-	cred = state->owner->so_cred;
-	if (req->wb_cred != cred)
-		return 0;
-	return 1;
-}
-
 int nfs4_proc_setclientid(struct nfs4_client *clp, u32 program, unsigned short port)
 {
 	static nfs4_verifier sc_verifier;
@@ -2353,13 +2284,14 @@ static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *
 static int
 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
 {
+	struct nfs_open_context *ctx;
 	struct nfs4_state *state;
 	unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
 	int status;
 
 	/* verify open state */
-	state = (struct nfs4_state *)filp->private_data;
-	BUG_ON(!state);
+	ctx = (struct nfs_open_context *)filp->private_data;
+	state = ctx->state;
 
 	if (request->fl_start < 0 || request->fl_end < 0)
 		return -EINVAL;
@@ -2419,8 +2351,6 @@ struct nfs_rpc_ops	nfs_v4_clientops = {
 	.commit_setup	= nfs4_proc_commit_setup,
 	.file_open      = nfs4_proc_file_open,
 	.file_release   = nfs4_proc_file_release,
-	.request_init	= nfs4_request_init,
-	.request_compatible = nfs4_request_compatible,
 	.lock		= nfs4_proc_lock,
 };
 

fs/nfs/nfs4state.c

@@ -728,7 +728,7 @@ static int nfs4_reclaim_locks(struct nfs4_state *state)
 	for (fl = inode->i_flock; fl != 0; fl = fl->fl_next) {
 		if (!(fl->fl_flags & FL_POSIX))
 			continue;
-		if ((struct nfs4_state *)fl->fl_file->private_data != state)
+		if (((struct nfs_open_context *)fl->fl_file->private_data)->state != state)
 			continue;
 		status = nfs4_lock_reclaim(state, fl);
 		if (status >= 0)

fs/nfs/pagelist.c

@@ -31,7 +31,6 @@ nfs_page_alloc(void)
 	if (p) {
 		memset(p, 0, sizeof(*p));
 		INIT_LIST_HEAD(&p->wb_list);
-		init_waitqueue_head(&p->wb_wait);
 	}
 	return p;
 }
@@ -57,7 +56,7 @@ nfs_page_free(struct nfs_page *p)
  * User should ensure it is safe to sleep in this function.
  */
 struct nfs_page *
-nfs_create_request(struct file *file, struct inode *inode,
+nfs_create_request(struct nfs_open_context *ctx, struct inode *inode,
 		   struct page *page,
 		   unsigned int offset, unsigned int count)
 {
@@ -89,33 +88,38 @@ nfs_create_request(struct file *file, struct inode *inode,
 	req->wb_offset  = offset;
 	req->wb_pgbase	= offset;
 	req->wb_bytes   = count;
-	req->wb_inode   = inode;
 	atomic_set(&req->wb_count, 1);
-	server->rpc_ops->request_init(req, file);
+	req->wb_context = get_nfs_open_context(ctx);
 
 	return req;
 }
 
+/**
+ * nfs_unlock_request - Unlock request and wake up sleepers.
+ * @req:
+ */
+void nfs_unlock_request(struct nfs_page *req)
+{
+	if (!NFS_WBACK_BUSY(req)) {
+		printk(KERN_ERR "NFS: Invalid unlock attempted\n");
+		BUG();
+	}
+	smp_mb__before_clear_bit();
+	clear_bit(PG_BUSY, &req->wb_flags);
+	smp_mb__after_clear_bit();
+	wake_up_all(&req->wb_context->waitq);
+	nfs_release_request(req);
+}
+
 /**
  * nfs_clear_request - Free up all resources allocated to the request
  * @req:
  *
- * Release all resources associated with a write request after it
+ * Release page resources associated with a write request after it
  * has completed.
  */
 void nfs_clear_request(struct nfs_page *req)
 {
-	if (req->wb_state)
-		req->wb_state = NULL;
-	/* Release struct file or cached credential */
-	if (req->wb_file) {
-		fput(req->wb_file);
-		req->wb_file = NULL;
-	}
-	if (req->wb_cred) {
-		put_rpccred(req->wb_cred);
-		req->wb_cred = NULL;
-	}
 	if (req->wb_page) {
 		page_cache_release(req->wb_page);
 		req->wb_page = NULL;
@@ -142,6 +146,7 @@ nfs_release_request(struct nfs_page *req)
 
 	/* Release struct file or cached credential */
 	nfs_clear_request(req);
+	put_nfs_open_context(req->wb_context);
 	nfs_page_free(req);
 }
 
@@ -185,12 +190,12 @@ nfs_list_add_request(struct nfs_page *req, struct list_head *head)
 int
 nfs_wait_on_request(struct nfs_page *req)
 {
-	struct inode	*inode = req->wb_inode;
+	struct inode	*inode = req->wb_context->dentry->d_inode;
         struct rpc_clnt	*clnt = NFS_CLIENT(inode);
 
 	if (!NFS_WBACK_BUSY(req))
 		return 0;
-	return nfs_wait_event(clnt, req->wb_wait, !NFS_WBACK_BUSY(req));
+	return nfs_wait_event(clnt, req->wb_context->waitq, !NFS_WBACK_BUSY(req));
 }
 
 /**
@@ -215,7 +220,11 @@ nfs_coalesce_requests(struct list_head *head, struct list_head *dst,
 
 		req = nfs_list_entry(head->next);
 		if (prev) {
-			if (req->wb_cred != prev->wb_cred)
+			if (req->wb_context->cred != prev->wb_context->cred)
+				break;
+			if (req->wb_context->lockowner != prev->wb_context->lockowner)
+				break;
+			if (req->wb_context->state != prev->wb_context->state)
 				break;
 			if (req->wb_index != (prev->wb_index + 1))
 				break;

fs/nfs/proc.c

@@ -49,18 +49,6 @@
 
 extern struct rpc_procinfo nfs_procedures[];
 
-static struct rpc_cred *
-nfs_cred(struct inode *inode, struct file *filp)
-{
-	struct rpc_cred *cred = NULL;
-
-	if (filp)
-		cred = (struct rpc_cred *)filp->private_data;
-	if (!cred)
-		cred = NFS_I(inode)->mm_cred;
-	return cred;
-}
-
 /*
  * Bare-bones access to getattr: this is for nfs_read_super.
  */
@@ -167,8 +155,7 @@ nfs_proc_readlink(struct inode *inode, struct page *page)
 	return status;
 }
 
-static int
-nfs_proc_read(struct nfs_read_data *rdata, struct file *filp)
+static int nfs_proc_read(struct nfs_read_data *rdata)
 {
 	int			flags = rdata->flags;
 	struct inode *		inode = rdata->inode;
@@ -177,15 +164,14 @@ nfs_proc_read(struct nfs_read_data *rdata, struct file *filp)
 		.rpc_proc	= &nfs_procedures[NFSPROC_READ],
 		.rpc_argp	= &rdata->args,
 		.rpc_resp	= &rdata->res,
+		.rpc_cred	= rdata->cred,
 	};
 	int			status;
 
 	dprintk("NFS call  read %d @ %Ld\n", rdata->args.count,
 			(long long) rdata->args.offset);
 	fattr->valid = 0;
-	msg.rpc_cred = nfs_cred(inode, filp);
 	status = rpc_call_sync(NFS_CLIENT(inode), &msg, flags);
-
 	if (status >= 0) {
 		nfs_refresh_inode(inode, fattr);
 		/* Emulate the eof flag, which isn't normally needed in NFSv2
@@ -198,8 +184,7 @@ nfs_proc_read(struct nfs_read_data *rdata, struct file *filp)
 	return status;
 }
 
-static int
-nfs_proc_write(struct nfs_write_data *wdata, struct file *filp)
+static int nfs_proc_write(struct nfs_write_data *wdata)
 {
 	int			flags = wdata->flags;
 	struct inode *		inode = wdata->inode;
@@ -208,13 +193,13 @@ nfs_proc_write(struct nfs_write_data *wdata, struct file *filp)
 		.rpc_proc	= &nfs_procedures[NFSPROC_WRITE],
 		.rpc_argp	= &wdata->args,
 		.rpc_resp	= &wdata->res,
+		.rpc_cred	= wdata->cred,
 	};
 	int			status;
 
 	dprintk("NFS call  write %d @ %Ld\n", wdata->args.count,
 			(long long) wdata->args.offset);
 	fattr->valid = 0;
-	msg.rpc_cred = nfs_cred(inode, filp);
 	status = rpc_call_sync(NFS_CLIENT(inode), &msg, flags);
 	if (status >= 0) {
 		nfs_refresh_inode(inode, fattr);
@@ -621,27 +606,6 @@ nfs_proc_commit_setup(struct nfs_write_data *data, int how)
 	BUG();
 }
 
-/*
- * Set up the nfspage struct with the right credentials
- */
-static void
-nfs_request_init(struct nfs_page *req, struct file *filp)
-{
-	req->wb_cred = get_rpccred(nfs_cred(req->wb_inode, filp));
-}
-
-static int
-nfs_request_compatible(struct nfs_page *req, struct file *filp, struct page *page)
-{
-	if (req->wb_file != filp)
-		return 0;
-	if (req->wb_page != page)
-		return 0;
-	if (req->wb_cred != nfs_file_cred(filp))
-		return 0;
-	return 1;
-}
-
 static int
 nfs_proc_lock(struct file *filp, int cmd, struct file_lock *fl)
 {
@@ -682,7 +646,5 @@ struct nfs_rpc_ops	nfs_v2_clientops = {
 	.commit_setup	= nfs_proc_commit_setup,
 	.file_open	= nfs_open,
 	.file_release	= nfs_release,
-	.request_init	= nfs_request_init,
-	.request_compatible = nfs_request_compatible,
 	.lock		= nfs_proc_lock,
 };

fs/nfs/read.c

@@ -91,8 +91,8 @@ int nfs_return_empty_page(struct page *page)
 /*
  * Read a page synchronously.
  */
-static int
-nfs_readpage_sync(struct file *file, struct inode *inode, struct page *page)
+static int nfs_readpage_sync(struct nfs_open_context *ctx, struct inode *inode,
+		struct page *page)
 {
 	unsigned int	rsize = NFS_SERVER(inode)->rsize;
 	unsigned int	count = PAGE_CACHE_SIZE;
@@ -105,10 +105,12 @@ nfs_readpage_sync(struct file *file, struct inode *inode, struct page *page)
 
 	memset(rdata, 0, sizeof(*rdata));
 	rdata->flags = (IS_SWAPFILE(inode)? NFS_RPC_SWAPFLAGS : 0);
+	rdata->cred = ctx->cred;
 	rdata->inode = inode;
 	INIT_LIST_HEAD(&rdata->pages);
 	rdata->args.fh = NFS_FH(inode);
-	rdata->args.lockowner = current->files;
+	rdata->args.lockowner = ctx->lockowner;
+	rdata->args.state = ctx->state;
 	rdata->args.pages = &page;
 	rdata->args.pgbase = 0UL;
 	rdata->args.count = rsize;
@@ -134,7 +136,7 @@ nfs_readpage_sync(struct file *file, struct inode *inode, struct page *page)
 			rdata->args.count);
 
 		lock_kernel();
-		result = NFS_PROTO(inode)->read(rdata, file);
+		result = NFS_PROTO(inode)->read(rdata);
 		unlock_kernel();
 
 		/*
@@ -169,8 +171,8 @@ nfs_readpage_sync(struct file *file, struct inode *inode, struct page *page)
 	return result;
 }
 
-static int
-nfs_readpage_async(struct file *file, struct inode *inode, struct page *page)
+static int nfs_readpage_async(struct nfs_open_context *ctx, struct inode *inode,
+		struct page *page)
 {
 	LIST_HEAD(one_request);
 	struct nfs_page	*new;
@@ -179,7 +181,7 @@ nfs_readpage_async(struct file *file, struct inode *inode, struct page *page)
 	len = nfs_page_length(inode, page);
 	if (len == 0)
 		return nfs_return_empty_page(page);
-	new = nfs_create_request(file, inode, page, 0, len);
+	new = nfs_create_request(ctx, inode, page, 0, len);
 	if (IS_ERR(new)) {
 		unlock_page(page);
 		return PTR_ERR(new);
@@ -202,8 +204,8 @@ static void nfs_readpage_release(struct nfs_page *req)
 	nfs_unlock_request(req);
 
 	dprintk("NFS: read done (%s/%Ld %d@%Ld)\n",
-			req->wb_inode->i_sb->s_id,
-			(long long)NFS_FILEID(req->wb_inode),
+			req->wb_context->dentry->d_inode->i_sb->s_id,
+			(long long)NFS_FILEID(req->wb_context->dentry->d_inode),
 			req->wb_bytes,
 			(long long)req_offset(req));
 }
@@ -217,16 +219,16 @@ static void nfs_read_rpcsetup(struct nfs_page *req, struct nfs_read_data *data,
 	struct inode		*inode;
 
 	data->req	  = req;
-	data->inode	  = inode = req->wb_inode;
-	data->cred	  = req->wb_cred;
+	data->inode	  = inode = req->wb_context->dentry->d_inode;
+	data->cred	  = req->wb_context->cred;
 
 	data->args.fh     = NFS_FH(inode);
 	data->args.offset = req_offset(req) + offset;
 	data->args.pgbase = req->wb_pgbase + offset;
 	data->args.pages  = data->pagevec;
 	data->args.count  = count;
-	data->args.lockowner = req->wb_lockowner;
-	data->args.state  = req->wb_state;
+	data->args.lockowner = req->wb_context->lockowner;
+	data->args.state  = req->wb_context->state;
 
 	data->res.fattr   = &data->fattr;
 	data->res.count   = count;
@@ -396,7 +398,7 @@ nfs_pagein_list(struct list_head *head, int rpages)
 	while (!list_empty(head)) {
 		pages += nfs_coalesce_requests(head, &one_request, rpages);
 		req = nfs_list_entry(one_request.next);
-		error = nfs_pagein_one(&one_request, req->wb_inode);
+		error = nfs_pagein_one(&one_request, req->wb_context->dentry->d_inode);
 		if (error < 0)
 			break;
 	}
@@ -500,9 +502,9 @@ void nfs_readpage_result(struct rpc_task *task)
  *  -	The error flag is set for this page. This happens only when a
  *	previous async read operation failed.
  */
-int
-nfs_readpage(struct file *file, struct page *page)
+int nfs_readpage(struct file *file, struct page *page)
 {
+	struct nfs_open_context *ctx;
 	struct inode *inode = page->mapping->host;
 	int		error;
 
@@ -519,25 +521,33 @@ nfs_readpage(struct file *file, struct page *page)
 	if (error)
 		goto out_error;
 
+	if (file == NULL) {
+		ctx = nfs_find_open_context(inode, FMODE_READ);
+		if (ctx == NULL)
+			return -EBADF;
+	} else
+		ctx = get_nfs_open_context((struct nfs_open_context *)
+				file->private_data);
 	if (!IS_SYNC(inode)) {
-		error = nfs_readpage_async(file, inode, page);
+		error = nfs_readpage_async(ctx, inode, page);
 		goto out;
 	}
 
-	error = nfs_readpage_sync(file, inode, page);
+	error = nfs_readpage_sync(ctx, inode, page);
 	if (error < 0 && IS_SWAPFILE(inode))
 		printk("Aiee.. nfs swap-in of page failed!\n");
 out:
+	put_nfs_open_context(ctx);
 	return error;
 
 out_error:
 	unlock_page(page);
-	goto out;
+	return error;
 }
 
 struct nfs_readdesc {
 	struct list_head *head;
-	struct file *filp;
+	struct nfs_open_context *ctx;
 };
 
 static int
@@ -552,7 +562,7 @@ readpage_async_filler(void *data, struct page *page)
 	len = nfs_page_length(inode, page);
 	if (len == 0)
 		return nfs_return_empty_page(page);
-	new = nfs_create_request(desc->filp, inode, page, 0, len);
+	new = nfs_create_request(desc->ctx, inode, page, 0, len);
 	if (IS_ERR(new)) {
 			SetPageError(page);
 			unlock_page(page);
@@ -565,13 +575,11 @@ readpage_async_filler(void *data, struct page *page)
 	return 0;
 }
 
-int
-nfs_readpages(struct file *filp, struct address_space *mapping,
+int nfs_readpages(struct file *filp, struct address_space *mapping,
 		struct list_head *pages, unsigned nr_pages)
 {
 	LIST_HEAD(head);
 	struct nfs_readdesc desc = {
-		.filp		= filp,
 		.head		= &head,
 	};
 	struct inode *inode = mapping->host;
@@ -583,12 +591,20 @@ nfs_readpages(struct file *filp, struct address_space *mapping,
 			(long long)NFS_FILEID(inode),
 			nr_pages);
 
+	if (filp == NULL) {
+		desc.ctx = nfs_find_open_context(inode, FMODE_READ);
+		if (desc.ctx == NULL)
+			return -EBADF;
+	} else
+		desc.ctx = get_nfs_open_context((struct nfs_open_context *)
+				filp->private_data);
 	ret = read_cache_pages(mapping, pages, readpage_async_filler, &desc);
 	if (!list_empty(&head)) {
 		int err = nfs_pagein_list(&head, server->rpages);
 		if (!ret)
 			ret = err;
 	}
+	put_nfs_open_context(desc.ctx);
 	return ret;
 }
 

include/linux/nfs_fs.h

@@ -83,6 +83,20 @@ struct nfs_access_entry {
 	int			mask;
 };
 
+struct nfs4_state;
+struct nfs_open_context {
+	atomic_t count;
+	struct dentry *dentry;
+	struct rpc_cred *cred;
+	struct nfs4_state *state;
+	fl_owner_t lockowner;
+	int mode;
+	int error;
+
+	struct list_head list;
+	wait_queue_head_t waitq;
+};
+
 /*
  * nfs fs inode data in memory
  */
@@ -156,8 +170,8 @@ struct nfs_inode {
 				ncommit,
 				npages;
 
-	/* Credentials for shared mmap */
-	struct rpc_cred		*mm_cred;
+	/* Open contexts for shared mmap writes */
+	struct list_head	open_files;
 
 	wait_queue_head_t	nfs_i_wait;
 
@@ -268,7 +282,6 @@ extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
 extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);
 extern int nfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
 extern int nfs_permission(struct inode *, int, struct nameidata *);
-extern void nfs_set_mmcred(struct inode *, struct rpc_cred *);
 extern int nfs_open(struct inode *, struct file *);
 extern int nfs_release(struct inode *, struct file *);
 extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
@@ -278,6 +291,12 @@ extern void nfs_end_attr_update(struct inode *);
 extern void nfs_begin_data_update(struct inode *);
 extern void nfs_end_data_update(struct inode *);
 extern void nfs_end_data_update_defer(struct inode *);
+extern struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, struct rpc_cred *cred);
+extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx);
+extern void put_nfs_open_context(struct nfs_open_context *ctx);
+extern void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx);
+extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, int mode);
+extern void nfs_file_clear_open_context(struct file *filp);
 
 /* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
 extern u32 root_nfs_parse_addr(char *name); /*__init*/
@@ -289,16 +308,15 @@ extern struct inode_operations nfs_file_inode_operations;
 extern struct file_operations nfs_file_operations;
 extern struct address_space_operations nfs_file_aops;
 
-static __inline__ struct rpc_cred *
-nfs_file_cred(struct file *file)
+static inline struct rpc_cred *nfs_file_cred(struct file *file)
 {
-	struct rpc_cred *cred = NULL;
-	if (file)
-		cred = (struct rpc_cred *)file->private_data;
-#ifdef RPC_DEBUG
-	BUG_ON(cred && cred->cr_magic != RPCAUTH_CRED_MAGIC);
-#endif
-	return cred;
+	if (file != NULL) {
+		struct nfs_open_context *ctx;
+
+		ctx = (struct nfs_open_context*)file->private_data;
+		return ctx->cred;
+	}
+	return NULL;
 }
 
 /*
@@ -684,6 +702,7 @@ struct nfs4_mount_data;
 #define destroy_nfsv4_state(server)       do { } while (0)
 #define nfs4_put_state_owner(inode, owner) do { } while (0)
 #define nfs4_put_open_state(state) do { } while (0)
+#define nfs4_close_state(a, b) do { } while (0)
 #define nfs4_renewd_prepare_shutdown(server) do { } while (0)
 #endif
 

include/linux/nfs_page.h

@@ -29,14 +29,9 @@
 struct nfs_page {
 	struct list_head	wb_list,	/* Defines state of page: */
 				*wb_list_head;	/*      read/write/commit */
-	struct file		*wb_file;
-	fl_owner_t		wb_lockowner;
-	struct inode		*wb_inode;
-	struct rpc_cred		*wb_cred;
-	struct nfs4_state	*wb_state;
 	struct page		*wb_page;	/* page to read in/write out */
+	struct nfs_open_context	*wb_context;	/* File state context info */
 	atomic_t		wb_complete;	/* i/os we're waiting for */
-	wait_queue_head_t	wb_wait;	/* wait queue */
 	unsigned long		wb_index;	/* Offset >> PAGE_CACHE_SHIFT */
 	unsigned int		wb_offset,	/* Offset & ~PAGE_CACHE_MASK */
 				wb_pgbase,	/* Start of page data */
@@ -50,9 +45,11 @@ struct nfs_page {
 #define NFS_NEED_COMMIT(req)	(test_bit(PG_NEED_COMMIT,&(req)->wb_flags))
 #define NFS_NEED_RESCHED(req)	(test_bit(PG_NEED_RESCHED,&(req)->wb_flags))
 
-extern	struct nfs_page *nfs_create_request(struct file *, struct inode *,
-					    struct page *,
-					    unsigned int, unsigned int);
+extern	struct nfs_page *nfs_create_request(struct nfs_open_context *ctx,
+					    struct inode *inode,
+					    struct page *page,
+					    unsigned int offset,
+					    unsigned int count);
 extern	void nfs_clear_request(struct nfs_page *req);
 extern	void nfs_release_request(struct nfs_page *req);
 
@@ -64,6 +61,7 @@ extern	int nfs_scan_list(struct list_head *, struct list_head *,
 extern	int nfs_coalesce_requests(struct list_head *, struct list_head *,
 				  unsigned int);
 extern  int nfs_wait_on_request(struct nfs_page *);
+extern	void nfs_unlock_request(struct nfs_page *req);
 
 /*
  * Lock the page of an asynchronous request without incrementing the wb_count
@@ -88,19 +86,6 @@ nfs_lock_request(struct nfs_page *req)
 	return 1;
 }
 
-static inline void
-nfs_unlock_request(struct nfs_page *req)
-{
-	if (!NFS_WBACK_BUSY(req)) {
-		printk(KERN_ERR "NFS: Invalid unlock attempted\n");
-		BUG();
-	}
-	smp_mb__before_clear_bit();
-	clear_bit(PG_BUSY, &req->wb_flags);
-	smp_mb__after_clear_bit();
-	wake_up_all(&req->wb_wait);
-	nfs_release_request(req);
-}
 
 /**
  * nfs_list_remove_request - Remove a request from its wb_list

include/linux/nfs_xdr.h

@@ -678,9 +678,9 @@ struct nfs_rpc_ops {
 			    struct nfs_fh *, struct nfs_fattr *);
 	int	(*access)  (struct inode *, struct nfs_access_entry *);
 	int	(*readlink)(struct inode *, struct page *);
-	int	(*read)    (struct nfs_read_data *, struct file *);
-	int	(*write)   (struct nfs_write_data *, struct file *);
-	int	(*commit)  (struct nfs_write_data *, struct file *);
+	int	(*read)    (struct nfs_read_data *);
+	int	(*write)   (struct nfs_write_data *);
+	int	(*commit)  (struct nfs_write_data *);
 	struct inode *	(*create)  (struct inode *, struct qstr *,
 			    struct iattr *, int);
 	int	(*remove)  (struct inode *, struct qstr *);
@@ -712,8 +712,6 @@ struct nfs_rpc_ops {
 	void	(*commit_setup) (struct nfs_write_data *, int how);
 	int	(*file_open)   (struct inode *, struct file *);
 	int	(*file_release) (struct inode *, struct file *);
-	void	(*request_init)(struct nfs_page *, struct file *);
-	int	(*request_compatible)(struct nfs_page *, struct file *, struct page *);
 	int	(*lock)(struct file *, int, struct file_lock *);
 };