linux-kernel - [PATCH 12/73] whiteout: Define flags and operations for opaque inodes [ver #2]

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Date:	Tue, 21 Feb 2012 17:58:58 +0000
From:	David Howells <dhowells@...hat.com>
To:	linux-fsdevel@...r.kernel.org, viro@...IV.linux.org.uk,
	valerie.aurora@...il.com
Cc:	linux-kernel@...r.kernel.org, David Howells <dhowells@...hat.com>
Subject: [PATCH 12/73] whiteout: Define flags and operations for opaque inodes
 [ver #2]

From: Valerie Aurora <vaurora@...hat.com>

Opaque directories are the directory equivalent of whiteouts.  Define the
generic opaque inode flags and operations.

Original-author: Valerie Aurora <vaurora@...hat.com>
Signed-off-by: David Howells <dhowells@...hat.com>
---

 include/linux/fs.h |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/include/linux/fs.h b/include/linux/fs.h
index b8276c0..ab36080 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -241,6 +241,7 @@ struct inodes_stat_t {
 #define S_IMA		1024	/* Inode has an associated IMA struct */
 #define S_AUTOMOUNT	2048	/* Automount/referral quasi-directory */
 #define S_NOSEC		4096	/* no suid or xattr security attributes */
+#define S_OPAQUE	8192	/* Directory is opaque */
 
 /*
  * Note that nosuid etc flags are inode-specific: setting some file-system
@@ -278,6 +279,7 @@ struct inodes_stat_t {
 #define IS_IMA(inode)		((inode)->i_flags & S_IMA)
 #define IS_AUTOMOUNT(inode)	((inode)->i_flags & S_AUTOMOUNT)
 #define IS_NOSEC(inode)		((inode)->i_flags & S_NOSEC)
+#define IS_OPAQUE(inode)	((inode)->i_flags & S_OPAQUE)
 
 /* the read-only stuff doesn't really belong here, but any other place is
    probably as bad and I don't want to create yet another include file. */
@@ -362,9 +364,11 @@ struct inodes_stat_t {
 #define FS_NOTAIL_FL			0x00008000 /* file tail should not be merged */
 #define FS_DIRSYNC_FL			0x00010000 /* dirsync behaviour (directories only) */
 #define FS_TOPDIR_FL			0x00020000 /* Top of directory hierarchies*/
+/* 0x00040000 is used by ext4 */
 #define FS_EXTENT_FL			0x00080000 /* Extents */
 #define FS_DIRECTIO_FL			0x00100000 /* Use direct i/o */
 #define FS_NOCOW_FL			0x00800000 /* Do not cow file */
+#define FS_OPAQUE_FL			0x04000000 /* Dir is opaque */
 #define FS_RESERVED_FL			0x80000000 /* reserved for ext2 lib */
 
 #define FS_FL_USER_VISIBLE		0x0003DFFF /* User visible flags */

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