From: Yan <yanzheng@21cn.com>
Date: Mon, 14 Jan 2008 18:35:00 +0000 (-0500)
Subject: Add readonly inode flag
X-Git-Tag: upstream/0.20.rc1~338
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=3a3123bfc1074ee81c8cb44938e4b50a044898b9;p=platform%2Fupstream%2Fbtrfs-progs.git

Add readonly inode flag

This patch adds readonly inode flag support.  A file with this flag
can't be modified, but can be deleted.
---

diff --git a/convert.c b/convert.c
index c047620..86c41b0 100644
--- a/convert.c
+++ b/convert.c
@@ -1163,7 +1163,8 @@ static int create_ext2_image(struct btrfs_root *root, ext2_filsys ext2_fs,
 	btrfs_set_stack_inode_nlink(&btrfs_inode, 1);
 	btrfs_set_stack_inode_nblocks(&btrfs_inode, 0);
 	btrfs_set_stack_inode_mode(&btrfs_inode, S_IFREG | 0400);
-	btrfs_set_stack_inode_flags(&btrfs_inode, BTRFS_INODE_NODATASUM);
+	btrfs_set_stack_inode_flags(&btrfs_inode, BTRFS_INODE_NODATASUM |
+				    BTRFS_INODE_READONLY);
 	btrfs_init_path(&path);
 	trans = btrfs_start_transaction(root, 1);
 	BUG_ON(!trans);
diff --git a/ctree.h b/ctree.h
index 444f47e..d619f30 100644
--- a/ctree.h
+++ b/ctree.h
@@ -418,8 +418,10 @@ struct btrfs_root {
 /*
  * Inode flags
  */
-#define BTRFS_INODE_NODATASUM 		0x1
-#define BTRFS_INODE_NODATACOW		0x2
+#define BTRFS_INODE_NODATASUM		(1 << 0)
+#define BTRFS_INODE_NODATACOW		(1 << 1)
+#define BTRFS_INODE_READONLY		(1 << 2)
+
 #define read_eb_member(eb, ptr, type, member, result) (			\
 	read_extent_buffer(eb, (char *)(result),			\
 			   ((unsigned long)(ptr)) +			\