Add a dentry op to allow processes to be held during pathwalk transit

[pandora-kernel.git] / include / linux / dcache.h

diff --git a/include/linux/dcache.h b/include/linux/dcache.h
index ee6c26d..1a87760 100644 (file)
--- a/include/linux/dcache.h
+++ b/include/linux/dcache.h
@@ -168,6 +168,7 @@ struct dentry_operations {
        void (*d_iput)(struct dentry *, struct inode *);
        char *(*d_dname)(struct dentry *, char *, int);
        struct vfsmount *(*d_automount)(struct path *);
+       int (*d_manage)(struct dentry *, bool);
 } ____cacheline_aligned;
 
 /*
@@ -214,8 +215,9 @@ struct dentry_operations {
 
 #define DCACHE_MOUNTED         0x10000 /* is a mountpoint */
 #define DCACHE_NEED_AUTOMOUNT  0x20000 /* handle automount on this dir */
+#define DCACHE_MANAGE_TRANSIT  0x40000 /* manage transit from this dirent */
 #define DCACHE_MANAGED_DENTRY \
-       (DCACHE_MOUNTED|DCACHE_NEED_AUTOMOUNT)
+       (DCACHE_MOUNTED|DCACHE_NEED_AUTOMOUNT|DCACHE_MANAGE_TRANSIT)
 
 extern seqlock_t rename_lock;
 
@@ -404,7 +406,12 @@ static inline void dont_mount(struct dentry *dentry)
 
 extern void dput(struct dentry *);
 
-static inline int d_mountpoint(struct dentry *dentry)
+static inline bool d_managed(struct dentry *dentry)
+{
+       return dentry->d_flags & DCACHE_MANAGED_DENTRY;
+}
+
+static inline bool d_mountpoint(struct dentry *dentry)
 {
        return dentry->d_flags & DCACHE_MOUNTED;
 }