linux-kernel - [PATCH 30/41] fallthru: Basic fallthru definitions

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Date:	Wed, 21 Oct 2009 12:19:28 -0700
From:	Valerie Aurora <vaurora@...hat.com>
To:	Jan Blunck <jblunck@...e.de>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Christoph Hellwig <hch@...radead.org>,
	Andy Whitcroft <apw@...onical.com>,
	Scott James Remnant <scott@...onical.com>,
	Sandu Popa Marius <sandupopamarius@...il.com>,
	Jan Rekorajski <baggins@...h.mimuw.edu.pl>,
	"J. R. Okajima" <hooanon05@...oo.co.jp>,
	Arnd Bergmann <arnd@...db.de>,
	Vladimir Dronnikov <dronnikov@...il.com>,
	Felix Fietkau <nbd@...nwrt.org>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 30/41] fallthru: Basic fallthru definitions

Define the fallthru dcache flag and file system op.

Signed-off-by: Valerie Aurora <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 730c432..a55f79f 100644
--- a/include/linux/dcache.h
+++ b/include/linux/dcache.h
@@ -193,6 +193,7 @@ d_iput:		no		no		no       yes
 
 #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 */
 
 #define DCACHE_FSNOTIFY_PARENT_WATCHED	0x0080 /* Parent inode is watched by some fsnotify listener */
 
@@ -381,6 +382,11 @@ 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 efea78c..57690ab 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1532,6 +1532,7 @@ 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);
-- 
1.6.3.3

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