NTFS: Split ntfs_aops into ntfs_normal_aops and ntfs_compressed_aops

in preparation for them diverging.
Signed-off-by: NAnton Altaparmakov <anton@tuxera.com>

fs/ntfs/aops.c

 /**
  * aops.c - NTFS kernel address space operations and page cache handling.
- *	    Part of the Linux-NTFS project.
  *
- * Copyright (c) 2001-2007 Anton Altaparmakov
+ * Copyright (c) 2001-2014 Anton Altaparmakov and Tuxera Inc.
  * Copyright (c) 2002 Richard Russon
  *
  * This program/include file is free software; you can redistribute it and/or
@@ -1539,16 +1538,33 @@ static int ntfs_writepage(struct page *page, struct writeback_control *wbc)
 #endif	/* NTFS_RW */
 
 /**
- * ntfs_aops - general address space operations for inodes and attributes
+ * ntfs_normal_aops - address space operations for normal inodes and attributes
+ *
+ * Note these are not used for compressed or mst protected inodes and
+ * attributes.
  */
-const struct address_space_operations ntfs_aops = {
-	.readpage	= ntfs_readpage,	/* Fill page with data. */
+const struct address_space_operations ntfs_normal_aops = {
+	.readpage	= ntfs_readpage,
 #ifdef NTFS_RW
-	.writepage	= ntfs_writepage,	/* Write dirty page to disk. */
+	.writepage	= ntfs_writepage,
+	.set_page_dirty	= __set_page_dirty_buffers,
+#endif /* NTFS_RW */
+	.migratepage	= buffer_migrate_page,
+	.is_partially_uptodate = block_is_partially_uptodate,
+	.error_remove_page = generic_error_remove_page,
+};
+
+/**
+ * ntfs_compressed_aops - address space operations for compressed inodes
+ */
+const struct address_space_operations ntfs_compressed_aops = {
+	.readpage	= ntfs_readpage,
+#ifdef NTFS_RW
+	.writepage	= ntfs_writepage,
+	.set_page_dirty	= __set_page_dirty_buffers,
 #endif /* NTFS_RW */
-	.migratepage	= buffer_migrate_page,	/* Move a page cache page from
-						   one physical page to an
-						   other. */
+	.migratepage	= buffer_migrate_page,
+	.is_partially_uptodate = block_is_partially_uptodate,
 	.error_remove_page = generic_error_remove_page,
 };
 
@@ -1564,9 +1580,8 @@ const struct address_space_operations ntfs_mst_aops = {
 						   without touching the buffers
 						   belonging to the page. */
 #endif /* NTFS_RW */
-	.migratepage	= buffer_migrate_page,	/* Move a page cache page from
-						   one physical page to an
-						   other. */
+	.migratepage	= buffer_migrate_page,
+	.is_partially_uptodate	= block_is_partially_uptodate,
 	.error_remove_page = generic_error_remove_page,
 };
 

fs/ntfs/inode.c

 /**
- * inode.c - NTFS kernel inode handling. Part of the Linux-NTFS project.
+ * inode.c - NTFS kernel inode handling.
  *
- * Copyright (c) 2001-2007 Anton Altaparmakov
+ * Copyright (c) 2001-2014 Anton Altaparmakov and Tuxera Inc.
  *
  * This program/include file is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as published
@@ -1012,6 +1012,7 @@ static int ntfs_read_locked_inode(struct inode *vi)
 		/* Setup the operations for this inode. */
 		vi->i_op = &ntfs_dir_inode_ops;
 		vi->i_fop = &ntfs_dir_ops;
+		vi->i_mapping->a_ops = &ntfs_mst_aops;
 	} else {
 		/* It is a file. */
 		ntfs_attr_reinit_search_ctx(ctx);
@@ -1160,11 +1161,12 @@ static int ntfs_read_locked_inode(struct inode *vi)
 		/* Setup the operations for this inode. */
 		vi->i_op = &ntfs_file_inode_ops;
 		vi->i_fop = &ntfs_file_ops;
+		vi->i_mapping->a_ops = &ntfs_normal_aops;
+		if (NInoMstProtected(ni))
+			vi->i_mapping->a_ops = &ntfs_mst_aops;
+		else if (NInoCompressed(ni))
+			vi->i_mapping->a_ops = &ntfs_compressed_aops;
 	}
-	if (NInoMstProtected(ni))
-		vi->i_mapping->a_ops = &ntfs_mst_aops;
-	else
-		vi->i_mapping->a_ops = &ntfs_aops;
 	/*
 	 * The number of 512-byte blocks used on disk (for stat). This is in so
 	 * far inaccurate as it doesn't account for any named streams or other
@@ -1414,10 +1416,11 @@ static int ntfs_read_locked_attr_inode(struct inode *base_vi, struct inode *vi)
 		ni->allocated_size = sle64_to_cpu(
 				a->data.non_resident.allocated_size);
 	}
+	vi->i_mapping->a_ops = &ntfs_normal_aops;
 	if (NInoMstProtected(ni))
 		vi->i_mapping->a_ops = &ntfs_mst_aops;
-	else
-		vi->i_mapping->a_ops = &ntfs_aops;
+	else if (NInoCompressed(ni))
+		vi->i_mapping->a_ops = &ntfs_compressed_aops;
 	if ((NInoCompressed(ni) || NInoSparse(ni)) && ni->type != AT_INDEX_ROOT)
 		vi->i_blocks = ni->itype.compressed.size >> 9;
 	else

fs/ntfs/ntfs.h

 /*
- * ntfs.h - Defines for NTFS Linux kernel driver. Part of the Linux-NTFS
- *	    project.
+ * ntfs.h - Defines for NTFS Linux kernel driver.
  *
- * Copyright (c) 2001-2005 Anton Altaparmakov
+ * Copyright (c) 2001-2014 Anton Altaparmakov and Tuxera Inc.
  * Copyright (C) 2002 Richard Russon
  *
  * This program/include file is free software; you can redistribute it and/or
@@ -57,7 +56,8 @@ extern struct kmem_cache *ntfs_attr_ctx_cache;
 extern struct kmem_cache *ntfs_index_ctx_cache;
 
 /* The various operations structs defined throughout the driver files. */
-extern const struct address_space_operations ntfs_aops;
+extern const struct address_space_operations ntfs_normal_aops;
+extern const struct address_space_operations ntfs_compressed_aops;
 extern const struct address_space_operations ntfs_mst_aops;
 
 extern const struct  file_operations ntfs_file_ops;