1 files changed, 102 insertions, 0 deletions
diff --git a/include/linux/nfs_page.h b/include/linux/nfs_page.h
new file mode 100644
index 000000000..475fced7c
--- /dev/null
+++ b/include/linux/nfs_page.h
@@ -0,0 +1,102 @@
+/*
+ * linux/include/linux/nfs_page.h
+ *
+ * Copyright (C) 2000 Trond Myklebust
+ *
+ * NFS page cache wrapper.
+ */
+
+#ifndef _LINUX_NFS_PAGE_H
+#define _LINUX_NFS_PAGE_H
+
+
+#include <linux/list.h>
+#include <linux/mm.h>
+#include <linux/wait.h>
+#include <linux/sunrpc/auth.h>
+#include <linux/nfs_xdr.h>
+
+/*
+ * Valid flags for a dirty buffer
+ */
+#define PG_BUSY			0x0001
+
+struct nfs_page {
+	struct list_head	wb_hash,	/* Inode */
+				wb_list,	/* Defines state of page: */
+				*wb_list_head;	/*      read/write/commit */
+	struct file		*wb_file;
+	struct dentry		*wb_dentry;
+	struct rpc_cred		*wb_cred;
+	struct page		*wb_page;	/* page to read in/write out */
+	wait_queue_head_t	wb_wait;	/* wait queue */
+	unsigned long		wb_timeout;	/* when to read/write/commit */
+	unsigned int		wb_offset,	/* Offset of read/write */
+				wb_bytes,	/* Length of request */
+				wb_count,	/* reference count */
+				wb_flags;
+	struct nfs_writeverf	wb_verf;	/* Commit cookie */
+};
+
+#define NFS_WBACK_BUSY(req)	((req)->wb_flags & PG_BUSY)
+
+extern	struct nfs_page *nfs_create_request(struct dentry *dentry,
+					    struct page *page,
+					    unsigned int offset,
+					    unsigned int count);
+extern	void nfs_release_request(struct nfs_page *req);
+
+
+extern	void nfs_list_add_request(struct nfs_page *req,
+				  struct list_head *head);
+extern	void nfs_list_remove_request(struct nfs_page *req);
+
+extern	int nfs_scan_list_timeout(struct list_head *head,
+				  struct list_head *dst,
+				  struct inode *inode);
+extern	int nfs_scan_list(struct list_head *src, struct list_head *dst,
+			  struct file *file, unsigned long idx_start,
+			  unsigned int npages);
+extern	int nfs_coalesce_requests(struct list_head *src, struct list_head *dst,
+				  unsigned int maxpages);
+
+extern	spinlock_t nfs_wreq_lock;
+
+/*
+ * Lock the page of an asynchronous request
+ */
+static __inline__ int
+nfs_lock_request(struct nfs_page *req)
+{
+	if (NFS_WBACK_BUSY(req))
+		return 0;
+	req->wb_count++;
+	req->wb_flags |= PG_BUSY;
+	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");
+		return;
+	}
+	req->wb_flags &= ~PG_BUSY;
+	wake_up(&req->wb_wait);
+	nfs_release_request(req);
+}
+
+static __inline__ struct nfs_page *
+nfs_list_entry(struct list_head *head)
+{
+	return list_entry(head, struct nfs_page, wb_list);
+}
+
+static __inline__ struct nfs_page *
+nfs_inode_wb_entry(struct list_head *head)
+{
+	return list_entry(head, struct nfs_page, wb_hash);
+}
+
+#endif /* _LINUX_NFS_PAGE_H */