commit 6ff8e6e0cab7481dd72d3f42f20054da2aaa4b3f
Author: Erez Zadok <[EMAIL PROTECTED]>
Date: Thu Oct 18 19:06:39 2007 -0400
Unionfs: support lower filesystems without writeback capability
Implement unionfs_writepages. As per
mm/filemap.c:__filemap_fdatawrite_range(), don't call our writepage if the
lower mapping has BDI_CAP_NO_WRITEBACK capability set.
Signed-off-by: Pekka J Enberg <[EMAIL PROTECTED]>
Signed-off-by: Erez Zadok <[EMAIL PROTECTED]>
diff --git a/fs/unionfs/mmap.c b/fs/unionfs/mmap.c
index 4ac5a8a..35a1755 100644
--- a/fs/unionfs/mmap.c
+++ b/fs/unionfs/mmap.c
@@ -140,6 +140,28 @@ out:
return err;
}
+static int unionfs_writepages(struct address_space *mapping,
+ struct writeback_control *wbc)
+{
+ int err = 0;
+ struct inode *lower_inode;
+ struct inode *inode;
+
+ inode = mapping->host;
+ lower_inode = unionfs_lower_inode(inode);
+ BUG_ON(!lower_inode);
+
+ if (mapping->backing_dev_info->memory_backed)
+ goto out;
+
+ /* Note: generic_writepages may return AOP_WRITEPAGE_ACTIVATE */
+ err = generic_writepages(mapping, wbc);
+ if (err == 0)
+ unionfs_copy_attr_times(inode);
+out:
+ return err;
+}
+
/*
* readpage is called from generic_page_read and the fault handler.
* If your file system uses generic_page_read for the read op, it
@@ -372,6 +394,7 @@ out:
struct address_space_operations unionfs_aops = {
.writepage = unionfs_writepage,
+ .writepages = unionfs_writepages,
.readpage = unionfs_readpage,
.prepare_write = unionfs_prepare_write,
.commit_write = unionfs_commit_write,
diff --git a/fs/unionfs/union.h b/fs/unionfs/union.h
index 6548dd8..18c430d 100644
--- a/fs/unionfs/union.h
+++ b/fs/unionfs/union.h
@@ -42,6 +42,8 @@
#include <linux/xattr.h>
#include <linux/fs_stack.h>
#include <linux/mman.h>
+#include <linux/backing-dev.h>
+#include <linux/mpage.h>
#include <asm/system.h>
_______________________________________________
unionfs-cvs mailing list: http://unionfs.filesystems.org/
[email protected]
http://www.fsl.cs.sunysb.edu/mailman/listinfo/unionfs-cvs
