linux-kernel - [PATCH 28/32] union-mount: Basic fallthru definitions

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Message-Id: <1242662968-11684-29-git-send-email-jblunck@suse.de>
Date:	Mon, 18 May 2009 18:09:24 +0200
From:	Jan Blunck <jblunck@...e.de>
To:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Cc:	viro@...iv.linux.org.uk, bharata@...ibm.com, dwmw2@...radead.org,
	mszeredi@...e.cz, vaurora@...hat.com
Subject: [PATCH 28/32] union-mount: Basic fallthru definitions

From: Valerie Aurora (Henson) <vaurora@...hat.com>

Define the fallthru dcache flag and file system op.

Signed-off-by: Valerie Aurora (Henson) <vaurora@...hat.com>
---
 include/linux/dcache.h |    6 ++++++
 include/linux/fs.h     |    1 +
 2 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/include/linux/dcache.h b/include/linux/dcache.h
index 7930b07..9534813 100644
--- a/include/linux/dcache.h
+++ b/include/linux/dcache.h
@@ -192,6 +192,7 @@ d_iput:		no		no		no       yes
 #define DCACHE_INOTIFY_PARENT_WATCHED	0x0020 /* Parent inode is watched */
 #define DCACHE_COOKIE		0x0040	/* For use by dcookie subsystem */
 #define DCACHE_WHITEOUT		0x0080	/* This negative dentry is a whiteout */
+#define DCACHE_FALLTHRU		0x0100	/* Keep looking in the file system below */
 
 extern spinlock_t dcache_lock;
 extern seqlock_t rename_lock;
@@ -373,6 +374,11 @@ static inline int d_is_whiteout(struct dentry *dentry)
 	return (dentry->d_flags & DCACHE_WHITEOUT);
 }
 
+static inline int d_is_fallthru(struct dentry *dentry)
+{
+	return (dentry->d_flags & DCACHE_FALLTHRU);
+}
+
 static inline struct dentry *dget_parent(struct dentry *dentry)
 {
 	struct dentry *ret;
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 7f07768..dd9c859 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1351,6 +1351,7 @@ struct inode_operations {
 	int (*rmdir) (struct inode *,struct dentry *);
 	int (*mknod) (struct inode *,struct dentry *,int,dev_t);
 	int (*whiteout) (struct inode *, struct dentry *, struct dentry *);
+	int (*fallthru) (struct inode *, struct dentry *);
 	int (*rename) (struct inode *, struct dentry *,
 			struct inode *, struct dentry *);
 	int (*readlink) (struct dentry *, char __user *,int);
-- 
1.6.1.3

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