fedora core 6 1.2949 + vserver 2.2.0

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

diff --git a/include/linux/file.h b/include/linux/file.h
index 9901b85..a59001e 100644 (file)
--- a/include/linux/file.h
+++ b/include/linux/file.h
@@ -10,6 +10,7 @@
 #include <linux/compiler.h>
 #include <linux/spinlock.h>
 #include <linux/rcupdate.h>
+#include <linux/types.h>
 
 /*
  * The default fd array needs to be at least BITS_PER_LONG,
@@ -17,15 +18,20 @@
  */
 #define NR_OPEN_DEFAULT BITS_PER_LONG
 
+/*
+ * The embedded_fd_set is a small fd_set,
+ * suitable for most tasks (which open <= BITS_PER_LONG files)
+ */
+struct embedded_fd_set {
+       unsigned long fds_bits[1];
+};
+
 struct fdtable {
        unsigned int max_fds;
-       int max_fdset;
-       int next_fd;
        struct file ** fd;      /* current fd array */
        fd_set *close_on_exec;
        fd_set *open_fds;
        struct rcu_head rcu;
-       struct files_struct *free_files;
        struct fdtable *next;
 };
 
@@ -33,17 +39,26 @@ struct fdtable {
  * Open file table structure
  */
 struct files_struct {
+  /*
+   * read mostly part
+   */
        atomic_t count;
        struct fdtable *fdt;
        struct fdtable fdtab;
-       fd_set close_on_exec_init;
-       fd_set open_fds_init;
+  /*
+   * written part on a separate cache line in SMP
+   */
+       spinlock_t file_lock ____cacheline_aligned_in_smp;
+       int next_fd;
+       struct embedded_fd_set close_on_exec_init;
+       struct embedded_fd_set open_fds_init;
        struct file * fd_array[NR_OPEN_DEFAULT];
-       spinlock_t file_lock;     /* Protects concurrent writers.  Nests inside tsk->alloc_lock */
 };
 
 #define files_fdtable(files) (rcu_dereference((files)->fdt))
 
+extern struct kmem_cache *filp_cachep;
+
 extern void FASTCALL(__fput(struct file *));
 extern void FASTCALL(fput(struct file *));
 
@@ -61,16 +76,15 @@ extern int get_unused_fd(void);
 extern void FASTCALL(put_unused_fd(unsigned int fd));
 struct kmem_cache;
 
-extern struct file ** alloc_fd_array(int);
-extern void free_fd_array(struct file **, int);
-
-extern fd_set *alloc_fdset(int);
-extern void free_fdset(fd_set *, int);
-
 extern int expand_files(struct files_struct *, int nr);
-extern void free_fdtable(struct fdtable *fdt);
+extern void free_fdtable_rcu(struct rcu_head *rcu);
 extern void __init files_defer_init(void);
 
+static inline void free_fdtable(struct fdtable *fdt)
+{
+       call_rcu(&fdt->rcu, free_fdtable_rcu);
+}
+
 static inline struct file * fcheck_files(struct files_struct *files, unsigned int fd)
 {
        struct file * file = NULL;
@@ -92,5 +106,8 @@ struct task_struct;
 
 struct files_struct *get_files_struct(struct task_struct *);
 void FASTCALL(put_files_struct(struct files_struct *fs));
+void reset_files_struct(struct task_struct *, struct files_struct *);
+
+extern struct kmem_cache *files_cachep;
 
 #endif /* __LINUX_FILE_H */