[PATCH] fdtable: Implement new pagesize-based fdtable allocator

[safe/jmp/linux-2.6] / include / linux / dcache.h

diff --git a/include/linux/dcache.h b/include/linux/dcache.h
index 46a2ba6..63f64a9 100644 (file)
--- a/include/linux/dcache.h
+++ b/include/linux/dcache.h
@@ -8,7 +8,6 @@
 #include <linux/spinlock.h>
 #include <linux/cache.h>
 #include <linux/rcupdate.h>
-#include <asm/bug.h>
 
 struct nameidata;
 struct vfsmount;
@@ -95,19 +94,38 @@ struct dentry {
        struct qstr d_name;
 
        struct list_head d_lru;         /* LRU list */
-       struct list_head d_child;       /* child of parent list */
+       /*
+        * d_child and d_rcu can share memory
+        */
+       union {
+               struct list_head d_child;       /* child of parent list */
+               struct rcu_head d_rcu;
+       } d_u;
        struct list_head d_subdirs;     /* our children */
        struct list_head d_alias;       /* inode alias list */
        unsigned long d_time;           /* used by d_revalidate */
        struct dentry_operations *d_op;
        struct super_block *d_sb;       /* The root of the dentry tree */
        void *d_fsdata;                 /* fs-specific data */
-       struct rcu_head d_rcu;
+#ifdef CONFIG_PROFILING
        struct dcookie_struct *d_cookie; /* cookie, if any */
+#endif
        int d_mounted;
        unsigned char d_iname[DNAME_INLINE_LEN_MIN];    /* small names */
 };
 
+/*
+ * dentry->d_lock spinlock nesting subclasses:
+ *
+ * 0: normal
+ * 1: nested
+ */
+enum dentry_d_lock_class
+{
+       DENTRY_D_LOCK_NORMAL, /* implicitly used by plain spin_lock() APIs. */
+       DENTRY_D_LOCK_NESTED
+};
+
 struct dentry_operations {
        int (*d_revalidate)(struct dentry *, struct nameidata *);
        int (*d_hash) (struct dentry *, struct qstr *);
@@ -156,6 +174,8 @@ d_iput:             no              no              no       yes
 #define DCACHE_REFERENCED      0x0008  /* Recently used, don't discard. */
 #define DCACHE_UNHASHED                0x0010  
 
+#define DCACHE_INOTIFY_PARENT_WATCHED  0x0020 /* Parent inode is watched */
+
 extern spinlock_t dcache_lock;
 
 /**
@@ -201,6 +221,7 @@ static inline int dname_external(struct dentry *dentry)
  */
 extern void d_instantiate(struct dentry *, struct inode *);
 extern struct dentry * d_instantiate_unique(struct dentry *, struct inode *);
+extern struct dentry * d_materialise_unique(struct dentry *, struct inode *);
 extern void d_delete(struct dentry *);
 
 /* allocate/de-allocate */
@@ -209,7 +230,7 @@ extern struct dentry * d_alloc_anon(struct inode *);
 extern struct dentry * d_splice_alias(struct inode *, struct dentry *);
 extern void shrink_dcache_sb(struct super_block *);
 extern void shrink_dcache_parent(struct dentry *);
-extern void shrink_dcache_anon(struct hlist_head *);
+extern void shrink_dcache_for_umount(struct super_block *);
 extern int d_invalidate(struct dentry *);
 
 /* only used at mount-time */
@@ -267,6 +288,7 @@ extern void d_move(struct dentry *, struct dentry *);
 /* appendix may either be NULL or be used for transname suffixes */
 extern struct dentry * d_lookup(struct dentry *, struct qstr *);
 extern struct dentry * __d_lookup(struct dentry *, struct qstr *);
+extern struct dentry * d_hash_and_lookup(struct dentry *, struct qstr *);
 
 /* validate "insecure" dentry pointer */
 extern int d_validate(struct dentry *, struct dentry *);