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Diffstat (limited to 'include/linux/file.h')
-rw-r--r--include/linux/file.h30
1 files changed, 22 insertions, 8 deletions
diff --git a/include/linux/file.h b/include/linux/file.h
index 5206beb9a80e..f5bbd4c508b3 100644
--- a/include/linux/file.h
+++ b/include/linux/file.h
@@ -9,6 +9,7 @@
#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,
@@ -16,23 +17,33 @@
*/
#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;
+ struct fdtable *fdt;
+ struct fdtable fdtab;
fd_set close_on_exec_init;
fd_set open_fds_init;
struct file * fd_array[NR_OPEN_DEFAULT];
};
+#define files_fdtable(files) (rcu_dereference((files)->fdt))
+
extern void FASTCALL(__fput(struct file *));
extern void FASTCALL(fput(struct file *));
@@ -59,13 +70,16 @@ 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 __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;
}