From 9cf26c629a96c44f4e4cc94832d246b5331fe75f Mon Sep 17 00:00:00 2001
From: charles <charles>
Date: Mon, 27 Oct 2003 08:27:01 +0000
Subject: [PATCH] *** empty log message ***

---
 yaffs_fs.c | 74 ++++++++++++++++++++++++++++++++++++++++++++++++------
 1 file changed, 66 insertions(+), 8 deletions(-)

diff --git a/yaffs_fs.c b/yaffs_fs.c
index 418f378..69039af 100644
--- a/yaffs_fs.c
+++ b/yaffs_fs.c
@@ -28,7 +28,7 @@
  */
 
 
-const char *yaffs_fs_c_version = "$Id: yaffs_fs.c,v 1.30 2003-09-20 01:13:48 charles Exp $";
+const char *yaffs_fs_c_version = "$Id: yaffs_fs.c,v 1.31 2003-10-27 08:27:01 charles Exp $";
 extern const char *yaffs_guts_c_version;
 
 
@@ -142,7 +142,7 @@ static void yaffs_delete_inode(struct inode *);
 static void yaffs_clear_inode(struct inode *);
 
 static int yaffs_readpage(struct file *file, struct page * page);
-
+static int yaffs_writepage(struct page *page);
 static int yaffs_prepare_write(struct file *f, struct page *pg, unsigned offset, unsigned to);
 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset, unsigned to);
 
@@ -154,6 +154,7 @@ static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
 
 static struct address_space_operations yaffs_file_address_operations = {
 	readpage:		yaffs_readpage,
+	writepage:		yaffs_writepage,
 	prepare_write:	yaffs_prepare_write,
 	commit_write:	yaffs_commit_write
 };
@@ -413,12 +414,12 @@ static int yaffs_readpage_nolock(struct file *f, struct page * pg)
 	// Lifted from jffs2
 	
 	yaffs_Object *obj;
-	unsigned char *pg_buf;	
+	unsigned char *pg_buf;
 	int ret;
-	
+
 	yaffs_Device *dev;
-	
-	T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readpage at %08x, size %08x\n", 
+
+	T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readpage at %08x, size %08x\n",
 	              (unsigned)(pg->index << PAGE_CACHE_SHIFT), (unsigned)PAGE_CACHE_SIZE));
 
 	obj  = yaffs_DentryToObject(f->f_dentry);
@@ -468,6 +469,63 @@ static int yaffs_readpage(struct file *f, struct page * pg)
 	return yaffs_readpage_unlock(f,pg);
 }
 
+// writepage inspired by/stolen from smbfs
+//
+
+static int yaffs_writepage(struct page *page)
+{
+	struct address_space *mapping = page->mapping;
+	struct inode *inode;
+	unsigned long end_index;
+	char *buffer;
+	yaffs_Object *obj;
+	int nWritten = 0;
+	unsigned nBytes;
+
+	if (!mapping)
+		BUG();
+	inode = mapping->host;
+	if (!inode)
+		BUG();
+
+	end_index = inode->i_size >> PAGE_CACHE_SHIFT;
+
+	/* easy case */
+	if (page->index < end_index)
+	{
+		nBytes = PAGE_CACHE_SIZE;
+	}
+	else
+	{
+		nBytes = inode->i_size & (PAGE_CACHE_SIZE-1);
+	}
+	//  What's happening here?
+	///* OK, are we completely out? */
+	//if (page->index >= end_index+1 || !offset)
+	//	return -EIO;
+
+	get_page(page);
+
+
+	buffer = kmap(page);
+
+	obj = yaffs_InodeToObject(inode);
+	yaffs_GrossLock(obj->myDev);
+
+
+	nWritten = yaffs_WriteDataToFile(obj,buffer,page->index << PAGE_CACHE_SHIFT,nBytes);
+
+	yaffs_GrossUnlock(obj->myDev);
+	
+	kunmap(page);
+	SetPageUptodate(page);
+	UnlockPage(page);
+	put_page(page);
+
+	return nWritten>0 ? nWritten : -ENOSPC;
+}
+
+
 
 static int yaffs_prepare_write(struct file *f, struct page *pg, unsigned offset, unsigned to)
 {
@@ -648,7 +706,7 @@ static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n, loff_
 	dev = obj->myDev;
 	
 	yaffs_GrossLock(dev);
-	
+
 	inode = f->f_dentry->d_inode;
 
 	if(!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND)
@@ -688,7 +746,7 @@ static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n, loff_
 	}
 	yaffs_GrossUnlock(dev);
 	
-	return nWritten != n ? -ENOSPC : nWritten;	
+	return nWritten != n ? -ENOSPC : nWritten;
 }
 
 
-- 
2.30.2