Oops; I added the wrong page.c

diff --git a/lustre/lib/page.c b/lustre/lib/page.c
new file mode 100644 (file)
index 0000000..ee96147
--- /dev/null
+++ b/lustre/lib/page.c
@@ -0,0 +1,113 @@
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/string.h>
+#include <linux/stat.h>
+#include <linux/errno.h>
+#include <linux/locks.h>
+#include <linux/unistd.h>
+
+#include <asm/system.h>
+#include <asm/uaccess.h>
+
+#include <linux/fs.h>
+#include <linux/stat.h>
+#include <asm/uaccess.h>
+#include <linux/vmalloc.h>
+#include <asm/segment.h>
+#include <linux/mm.h>
+#include <linux/pagemap.h>
+#include <linux/smp_lock.h>
+
+#include <linux/obd_support.h>
+#include <linux/lustre_lib.h>
+#include <linux/lustre_idl.h>
+#include <linux/lustre_mds.h>
+#include <linux/lustre_light.h>
+
+
+
+/*
+ * Remove page from dirty list
+ */
+static void __set_page_clean(struct page *page)
+{
+       struct address_space *mapping = page->mapping;
+       struct inode *inode;
+       
+       if (!mapping)
+               return;
+
+       spin_lock(&pagecache_lock);
+       list_del(&page->list);
+       list_add(&page->list, &mapping->clean_pages);
+
+       inode = mapping->host;
+       if (list_empty(&mapping->dirty_pages)) { 
+               CDEBUG(D_INODE, "inode clean\n");
+               inode->i_state &= ~I_DIRTY_PAGES;
+       }
+       spin_unlock(&pagecache_lock);
+       EXIT;
+}
+
+inline void set_page_clean(struct page *page)
+{
+       if (PageDirty(page)) { 
+               ClearPageDirty(page);
+               __set_page_clean(page);
+       }
+}
+
+inline void lustre_put_page(struct page *page)
+{
+       kunmap(page);
+       page_cache_release(page);
+}
+
+struct page * lustre_get_page(struct inode *dir, unsigned long n)
+{
+       struct address_space *mapping = dir->i_mapping;
+       struct page *page = read_cache_page(mapping, n,
+                               (filler_t*)mapping->a_ops->readpage, NULL);
+       if (!IS_ERR(page)) {
+               wait_on_page(page);
+               kmap(page);
+               if (!Page_Uptodate(page))
+                       goto fail;
+               if (PageError(page))
+                       goto fail;
+       }
+       return page;
+
+fail:
+       lustre_put_page(page);
+       return ERR_PTR(-EIO);
+}
+
+void lustre_prepare_page(unsigned from, unsigned to, struct page *page)
+{
+       int err;
+
+       lock_page(page);
+       err = page->mapping->a_ops->prepare_write(NULL, page, from, to);
+       if (err)
+               BUG();
+
+}
+
+int lustre_commit_page(struct page *page, unsigned from, unsigned to)
+{
+       struct inode *dir = page->mapping->host;
+       int err = 0;
+
+       SetPageUptodate(page);
+       set_page_clean(page);
+
+       page->mapping->a_ops->commit_write(NULL, page, from, to);
+       if (IS_SYNC(dir))
+               err = waitfor_one_page(page);
+       UnlockPage(page);
+       lustre_put_page(page);
+       return err;
+}