nfs MAP_SHARED corruption fix

[Andrea Arcangeli]

This fixes corruption with MAP_SHARED on top of nfs filesystem in 2.4:

--- 2.4.5pre1aa2/fs/nfs/write.c.~1~     Tue May  1 19:35:29 2001
+++ 2.4.5pre1aa2/fs/nfs/write.c Tue May  8 02:04:15 2001
@@ -1533,6 +1533,7 @@
        if (!inode && file)
                inode = file->f_dentry->d_inode;
 
+       filemap_fdatasync(inode->i_mapping);
        do {
                error = 0;
                if (wait)

Andrea
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