#include <linux/posix_types.h>
#include <linux/compiler.h>
#include <linux/spinlock.h>
+#include <linux/rcupdate.h>
/*
* The default fd array needs to be at least BITS_PER_LONG,
*/
#define NR_OPEN_DEFAULT BITS_PER_LONG
+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;
+};
+
/*
* Open file table structure
*/
struct files_struct {
- atomic_t count;
- spinlock_t file_lock; /* Protects all the below members. Nests inside tsk->alloc_lock */
- int max_fds;
- int max_fdset;
- int next_fd;
- struct file ** fd; /* current fd array */
- fd_set *close_on_exec;
- fd_set *open_fds;
- fd_set close_on_exec_init;
- fd_set open_fds_init;
- struct file * fd_array[NR_OPEN_DEFAULT];
+ atomic_t count;
+ struct fdtable *fdt;
+ struct fdtable fdtab;
+ fd_set close_on_exec_init;
+ 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 void FASTCALL(__fput(struct file *));
extern void FASTCALL(fput(struct file *));
extern void put_filp(struct file *);
extern int get_unused_fd(void);
extern void FASTCALL(put_unused_fd(unsigned int fd));
-struct kmem_cache_s;
-extern void filp_ctor(void * objp, struct kmem_cache_s *cachep, unsigned long cflags);
-extern void filp_dtor(void * objp, struct kmem_cache_s *cachep, unsigned long dflags);
+struct kmem_cache;
extern struct file ** alloc_fd_array(int);
-extern int expand_fd_array(struct files_struct *, int nr);
extern void free_fd_array(struct file **, int);
extern fd_set *alloc_fdset(int);
-extern int expand_fdset(struct files_struct *, int nr);
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 __init files_defer_init(void);
+
static inline struct file * fcheck_files(struct files_struct *files, unsigned int fd)
{
struct file * file = NULL;
+ struct fdtable *fdt = files_fdtable(files);
- if (fd < files->max_fds)
- file = files->fd[fd];
+ if (fd < fdt->max_fds)
+ file = rcu_dereference(fdt->fd[fd]);
return file;
}
struct files_struct *get_files_struct(struct task_struct *);
void FASTCALL(put_files_struct(struct files_struct *fs));
-extern int dupfd(struct file *file, unsigned int start);
-
#endif /* __LINUX_FILE_H */