fedora core 6 1.2949 + vserver 2.2.0

[linux-2.6.git] / include / linux / dcache.h

diff --git a/include/linux/dcache.h b/include/linux/dcache.h
index 2da7686..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;
@@ -88,26 +87,45 @@ struct dentry {
                                         * negative */
        /*
         * The next three fields are touched by __d_lookup.  Place them here
-        * so they all fit in a 16-byte range, with 16-byte alignment.
+        * so they all fit in a cache line.
         */
+       struct hlist_node d_hash;       /* lookup hash list */
        struct dentry *d_parent;        /* parent directory */
        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 */
-       struct hlist_node d_hash;       /* lookup hash list */  
+#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 *);
@@ -156,23 +174,24 @@ 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;
 
 /**
  * d_drop - drop a dentry
  * @dentry: dentry to drop
  *
- * d_drop() unhashes the entry from the parent
- * dentry hashes, so that it won't be found through
- * a VFS lookup any more. Note that this is different
- * from deleting the dentry - d_delete will try to
- * mark the dentry negative if possible, giving a
- * successful _negative_ lookup, while d_drop will
+ * d_drop() unhashes the entry from the parent dentry hashes, so that it won't
+ * be found through a VFS lookup any more. Note that this is different from
+ * deleting the dentry - d_delete will try to mark the dentry negative if
+ * possible, giving a successful _negative_ lookup, while d_drop will
  * just make the cache lookup fail.
  *
- * d_drop() is used mainly for stuff that wants
- * to invalidate a dentry for some reason (NFS
- * timeouts or autofs deletes).
+ * d_drop() is used mainly for stuff that wants to invalidate a dentry for some
+ * reason (NFS timeouts or autofs deletes).
+ *
+ * __d_drop requires dentry->d_lock.
  */
 
 static inline void __d_drop(struct dentry *dentry)
@@ -186,7 +205,9 @@ static inline void __d_drop(struct dentry *dentry)
 static inline void d_drop(struct dentry *dentry)
 {
        spin_lock(&dcache_lock);
+       spin_lock(&dentry->d_lock);
        __d_drop(dentry);
+       spin_unlock(&dentry->d_lock);
        spin_unlock(&dcache_lock);
 }
 
@@ -200,6 +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 */
@@ -208,7 +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 */
@@ -266,6 +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 *);
@@ -328,6 +351,7 @@ static inline int d_mountpoint(struct dentry *dentry)
 }
 
 extern struct vfsmount *lookup_mnt(struct vfsmount *, struct dentry *);
+extern struct vfsmount *__lookup_mnt(struct vfsmount *, struct dentry *, int);
 extern struct dentry *lookup_create(struct nameidata *nd, int is_dir);
 
 extern int sysctl_vfs_cache_pressure;