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Subject[PATCH 13/39] fallthru: Basic fallthru definitions
Date
Define the fallthru dcache flag and file system op.  Mask out the
DCACHE_FALLTHRU flag on dentry creation. Actual users and changes to
lookup come in later patches.

Signed-off-by: Valerie Aurora <vaurora@redhat.com>
---
Documentation/filesystems/vfs.txt | 6 ++++++
fs/dcache.c | 2 +-
include/linux/dcache.h | 7 +++++++
include/linux/fs.h | 2 ++
4 files changed, 16 insertions(+), 1 deletions(-)

diff --git a/Documentation/filesystems/vfs.txt b/Documentation/filesystems/vfs.txt
index 964e0fc..bbaefa9 100644
--- a/Documentation/filesystems/vfs.txt
+++ b/Documentation/filesystems/vfs.txt
@@ -320,6 +320,7 @@ 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);
@@ -390,6 +391,11 @@ otherwise noted.
second is the dentry for the whiteout itself. This method
must unlink() or rmdir() the original entry if it exists.

+ fallthru: called by the readdir(2) system call on a layered file
+ system. Only required if you want to support fallthrus.
+ Fallthrus are place-holders for directory entries visible from
+ a lower level file system.
+
rename: called by the rename(2) system call to rename the object to
have the parent and name given by the second inode and dentry.

diff --git a/fs/dcache.c b/fs/dcache.c
index 79b9f6a..249d077 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -992,7 +992,7 @@ EXPORT_SYMBOL(d_alloc_name);
static void __d_instantiate(struct dentry *dentry, struct inode *inode)
{
if (inode) {
- dentry->d_flags &= ~DCACHE_WHITEOUT;
+ dentry->d_flags &= ~(DCACHE_WHITEOUT|DCACHE_FALLTHRU);
list_add(&dentry->d_alias, &inode->i_dentry);
}
dentry->d_inode = inode;
diff --git a/include/linux/dcache.h b/include/linux/dcache.h
index 7d650a2..0904716 100644
--- a/include/linux/dcache.h
+++ b/include/linux/dcache.h
@@ -190,6 +190,8 @@ d_iput: no no no yes

#define DCACHE_WHITEOUT 0x0200 /* Stop lookup in a unioned file system */

+#define DCACHE_FALLTHRU 0x0400 /* Continue lookup below an opaque dir */
+
extern spinlock_t dcache_lock;
extern seqlock_t rename_lock;

@@ -379,6 +381,11 @@ 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 1dbe156..71ee74e 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -210,6 +210,7 @@ struct inodes_stat_t {
#define MS_I_VERSION (1<<23) /* Update inode I_version field */
#define MS_STRICTATIME (1<<24) /* Always perform atime updates */
#define MS_WHITEOUT (1<<25) /* FS supports whiteout filetype */
+#define MS_FALLTHRU (1<<26) /* FS supports fallthru filetype */
#define MS_ACTIVE (1<<30)
#define MS_NOUSER (1<<31)

@@ -1534,6 +1535,7 @@ 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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