From 9f3acc3140444a900ab280de942291959f0f615d Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Thu, 24 Apr 2008 07:44:08 -0400
Subject: [PATCH] [PATCH] split linux/file.h

Initial splitoff of the low-level stuff; taken to fdtable.h

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 arch/mips/kernel/kspd.c                      |   1 +
 arch/powerpc/platforms/cell/spufs/coredump.c |   1 +
 drivers/char/tty_audit.c                     |   1 +
 drivers/char/tty_io.c                        |   1 +
 fs/compat.c                                  |   1 +
 fs/dnotify.c                                 |   2 +-
 fs/exec.c                                    |   1 +
 fs/fcntl.c                                   |   1 +
 fs/file.c                                    |   1 +
 fs/file_table.c                              |   1 +
 fs/locks.c                                   |   1 +
 fs/open.c                                    |   1 +
 fs/proc/array.c                              |   1 +
 fs/proc/base.c                               |   1 +
 fs/select.c                                  |   1 +
 include/linux/{file.h => fdtable.h}          |  34 +-----
 include/linux/file.h                         | 168 +++++++--------------------
 include/linux/init_task.h                    |   2 +-
 kernel/exit.c                                |   1 +
 kernel/fork.c                                |   1 +
 kernel/kmod.c                                |   1 +
 security/selinux/hooks.c                     |   1 +
 22 files changed, 67 insertions(+), 157 deletions(-)
 copy include/linux/{file.h => fdtable.h} (67%)
 rewrite include/linux/file.h (62%)

diff --git a/arch/mips/kernel/kspd.c b/arch/mips/kernel/kspd.c
index 998c4efcce8..ceb62dce1c9 100644
--- a/arch/mips/kernel/kspd.c
+++ b/arch/mips/kernel/kspd.c
@@ -20,6 +20,7 @@
 #include <linux/sched.h>
 #include <linux/unistd.h>
 #include <linux/file.h>
+#include <linux/fdtable.h>
 #include <linux/fs.h>
 #include <linux/syscalls.h>
 #include <linux/workqueue.h>
diff --git a/arch/powerpc/platforms/cell/spufs/coredump.c b/arch/powerpc/platforms/cell/spufs/coredump.c
index b962c3ab470..af116aadba1 100644
--- a/arch/powerpc/platforms/cell/spufs/coredump.c
+++ b/arch/powerpc/platforms/cell/spufs/coredump.c
@@ -22,6 +22,7 @@
 
 #include <linux/elf.h>
 #include <linux/file.h>
+#include <linux/fdtable.h>
 #include <linux/fs.h>
 #include <linux/list.h>
 #include <linux/module.h>
diff --git a/drivers/char/tty_audit.c b/drivers/char/tty_audit.c
index 6342b0534f4..3582f43345a 100644
--- a/drivers/char/tty_audit.c
+++ b/drivers/char/tty_audit.c
@@ -11,6 +11,7 @@
 
 #include <linux/audit.h>
 #include <linux/file.h>
+#include <linux/fdtable.h>
 #include <linux/tty.h>
 
 struct tty_audit_buf {
diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c
index 1d298c2cf93..49c1a2267a5 100644
--- a/drivers/char/tty_io.c
+++ b/drivers/char/tty_io.c
@@ -78,6 +78,7 @@
 #include <linux/tty_flip.h>
 #include <linux/devpts_fs.h>
 #include <linux/file.h>
+#include <linux/fdtable.h>
 #include <linux/console.h>
 #include <linux/timer.h>
 #include <linux/ctype.h>
diff --git a/fs/compat.c b/fs/compat.c
index 139dc93c092..332a869d2c5 100644
--- a/fs/compat.c
+++ b/fs/compat.c
@@ -24,6 +24,7 @@
 #include <linux/fcntl.h>
 #include <linux/namei.h>
 #include <linux/file.h>
+#include <linux/fdtable.h>
 #include <linux/vfs.h>
 #include <linux/ioctl.h>
 #include <linux/init.h>
diff --git a/fs/dnotify.c b/fs/dnotify.c
index eaecc4cfe54..676073b8dda 100644
--- a/fs/dnotify.c
+++ b/fs/dnotify.c
@@ -20,7 +20,7 @@
 #include <linux/init.h>
 #include <linux/spinlock.h>
 #include <linux/slab.h>
-#include <linux/file.h>
+#include <linux/fdtable.h>
 
 int dir_notify_enable __read_mostly = 1;
 
diff --git a/fs/exec.c b/fs/exec.c
index 9f9f931ef94..aeaa9791d8b 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -24,6 +24,7 @@
 
 #include <linux/slab.h>
 #include <linux/file.h>
+#include <linux/fdtable.h>
 #include <linux/mman.h>
 #include <linux/a.out.h>
 #include <linux/stat.h>
diff --git a/fs/fcntl.c b/fs/fcntl.c
index 3f3ac630ccd..bfd776509a7 100644
--- a/fs/fcntl.c
+++ b/fs/fcntl.c
@@ -9,6 +9,7 @@
 #include <linux/mm.h>
 #include <linux/fs.h>
 #include <linux/file.h>
+#include <linux/fdtable.h>
 #include <linux/capability.h>
 #include <linux/dnotify.h>
 #include <linux/smp_lock.h>
diff --git a/fs/file.c b/fs/file.c
index 5110acb1c9e..f6fbcb49faf 100644
--- a/fs/file.c
+++ b/fs/file.c
@@ -12,6 +12,7 @@
 #include <linux/slab.h>
 #include <linux/vmalloc.h>
 #include <linux/file.h>
+#include <linux/fdtable.h>
 #include <linux/bitops.h>
 #include <linux/interrupt.h>
 #include <linux/spinlock.h>
diff --git a/fs/file_table.c b/fs/file_table.c
index 7a0a9b87225..83084225b4c 100644
--- a/fs/file_table.c
+++ b/fs/file_table.c
@@ -8,6 +8,7 @@
 #include <linux/string.h>
 #include <linux/slab.h>
 #include <linux/file.h>
+#include <linux/fdtable.h>
 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/fs.h>
diff --git a/fs/locks.c b/fs/locks.c
index 44d9a6a7ec5..663c069b59b 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -116,6 +116,7 @@
 
 #include <linux/capability.h>
 #include <linux/file.h>
+#include <linux/fdtable.h>
 #include <linux/fs.h>
 #include <linux/init.h>
 #include <linux/module.h>
diff --git a/fs/open.c b/fs/open.c
index 7af1f05d597..a1450086e92 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -7,6 +7,7 @@
 #include <linux/string.h>
 #include <linux/mm.h>
 #include <linux/file.h>
+#include <linux/fdtable.h>
 #include <linux/quotaops.h>
 #include <linux/fsnotify.h>
 #include <linux/module.h>
diff --git a/fs/proc/array.c b/fs/proc/array.c
index c135cbdd912..dca997a93bf 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -73,6 +73,7 @@
 #include <linux/signal.h>
 #include <linux/highmem.h>
 #include <linux/file.h>
+#include <linux/fdtable.h>
 #include <linux/times.h>
 #include <linux/cpuset.h>
 #include <linux/rcupdate.h>
diff --git a/fs/proc/base.c b/fs/proc/base.c
index fcf02f2deeb..808cbdc193d 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -56,6 +56,7 @@
 #include <linux/init.h>
 #include <linux/capability.h>
 #include <linux/file.h>
+#include <linux/fdtable.h>
 #include <linux/string.h>
 #include <linux/seq_file.h>
 #include <linux/namei.h>
diff --git a/fs/select.c b/fs/select.c
index 80d70387e79..8dda969614a 100644
--- a/fs/select.c
+++ b/fs/select.c
@@ -21,6 +21,7 @@
 #include <linux/poll.h>
 #include <linux/personality.h> /* for STICKY_TIMEOUTS */
 #include <linux/file.h>
+#include <linux/fdtable.h>
 #include <linux/fs.h>
 #include <linux/rcupdate.h>
 
diff --git a/include/linux/file.h b/include/linux/fdtable.h
similarity index 67%
copy from include/linux/file.h
copy to include/linux/fdtable.h
index 69baf5a4f0a..a118f3c0b24 100644
--- a/include/linux/file.h
+++ b/include/linux/fdtable.h
@@ -1,9 +1,9 @@
 /*
- * Wrapper functions for accessing the file_struct fd array.
+ * descriptor table internals; you almost certainly want file.h instead.
  */
 
-#ifndef __LINUX_FILE_H
-#define __LINUX_FILE_H
+#ifndef __LINUX_FDTABLE_H
+#define __LINUX_FDTABLE_H
 
 #include <asm/atomic.h>
 #include <linux/posix_types.h>
@@ -59,33 +59,9 @@ struct files_struct {
 
 extern struct kmem_cache *filp_cachep;
 
-extern void __fput(struct file *);
-extern void fput(struct file *);
-extern void drop_file_write_access(struct file *file);
-
 struct file_operations;
 struct vfsmount;
 struct dentry;
-extern int init_file(struct file *, struct vfsmount *mnt,
-		struct dentry *dentry, mode_t mode,
-		const struct file_operations *fop);
-extern struct file *alloc_file(struct vfsmount *, struct dentry *dentry,
-		mode_t mode, const struct file_operations *fop);
-
-static inline void fput_light(struct file *file, int fput_needed)
-{
-	if (unlikely(fput_needed))
-		fput(file);
-}
-
-extern struct file *fget(unsigned int fd);
-extern struct file *fget_light(unsigned int fd, int *fput_needed);
-extern void set_close_on_exec(unsigned int fd, int flag);
-extern void put_filp(struct file *);
-extern int get_unused_fd(void);
-extern int get_unused_fd_flags(int flags);
-extern void put_unused_fd(unsigned int fd);
-struct kmem_cache;
 
 extern int expand_files(struct files_struct *, int nr);
 extern void free_fdtable_rcu(struct rcu_head *rcu);
@@ -111,8 +87,6 @@ static inline struct file * fcheck_files(struct files_struct *files, unsigned in
  */
 #define fcheck(fd)	fcheck_files(current->files, fd)
 
-extern void fd_install(unsigned int fd, struct file *file);
-
 struct task_struct;
 
 struct files_struct *get_files_struct(struct task_struct *);
@@ -122,4 +96,4 @@ int unshare_files(struct files_struct **);
 
 extern struct kmem_cache *files_cachep;
 
-#endif /* __LINUX_FILE_H */
+#endif /* __LINUX_FDTABLE_H */
diff --git a/include/linux/file.h b/include/linux/file.h
dissimilarity index 62%
index 69baf5a4f0a..27c64bdc68c 100644
--- a/include/linux/file.h
+++ b/include/linux/file.h
@@ -1,125 +1,43 @@
-/*
- * Wrapper functions for accessing the file_struct fd array.
- */
-
-#ifndef __LINUX_FILE_H
-#define __LINUX_FILE_H
-
-#include <asm/atomic.h>
-#include <linux/posix_types.h>
-#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,
- * as this is the granularity returned by copy_fdset().
- */
-#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;
-	struct file ** fd;      /* current fd array */
-	fd_set *close_on_exec;
-	fd_set *open_fds;
-	struct rcu_head rcu;
-	struct fdtable *next;
-};
-
-/*
- * Open file table structure
- */
-struct files_struct {
-  /*
-   * read mostly part
-   */
-	atomic_t count;
-	struct fdtable *fdt;
-	struct fdtable fdtab;
-  /*
-   * 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];
-};
-
-#define files_fdtable(files) (rcu_dereference((files)->fdt))
-
-extern struct kmem_cache *filp_cachep;
-
-extern void __fput(struct file *);
-extern void fput(struct file *);
-extern void drop_file_write_access(struct file *file);
-
-struct file_operations;
-struct vfsmount;
-struct dentry;
-extern int init_file(struct file *, struct vfsmount *mnt,
-		struct dentry *dentry, mode_t mode,
-		const struct file_operations *fop);
-extern struct file *alloc_file(struct vfsmount *, struct dentry *dentry,
-		mode_t mode, const struct file_operations *fop);
-
-static inline void fput_light(struct file *file, int fput_needed)
-{
-	if (unlikely(fput_needed))
-		fput(file);
-}
-
-extern struct file *fget(unsigned int fd);
-extern struct file *fget_light(unsigned int fd, int *fput_needed);
-extern void set_close_on_exec(unsigned int fd, int flag);
-extern void put_filp(struct file *);
-extern int get_unused_fd(void);
-extern int get_unused_fd_flags(int flags);
-extern void put_unused_fd(unsigned int fd);
-struct kmem_cache;
-
-extern int expand_files(struct files_struct *, int nr);
-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;
-	struct fdtable *fdt = files_fdtable(files);
-
-	if (fd < fdt->max_fds)
-		file = rcu_dereference(fdt->fd[fd]);
-	return file;
-}
-
-/*
- * Check whether the specified fd has an open file.
- */
-#define fcheck(fd)	fcheck_files(current->files, fd)
-
-extern void fd_install(unsigned int fd, struct file *file);
-
-struct task_struct;
-
-struct files_struct *get_files_struct(struct task_struct *);
-void put_files_struct(struct files_struct *fs);
-void reset_files_struct(struct files_struct *);
-int unshare_files(struct files_struct **);
-
-extern struct kmem_cache *files_cachep;
-
-#endif /* __LINUX_FILE_H */
+/*
+ * Wrapper functions for accessing the file_struct fd array.
+ */
+
+#ifndef __LINUX_FILE_H
+#define __LINUX_FILE_H
+
+#include <linux/compiler.h>
+#include <linux/types.h>
+#include <linux/posix_types.h>
+
+struct file;
+
+extern void __fput(struct file *);
+extern void fput(struct file *);
+extern void drop_file_write_access(struct file *file);
+
+struct file_operations;
+struct vfsmount;
+struct dentry;
+extern int init_file(struct file *, struct vfsmount *mnt,
+		struct dentry *dentry, mode_t mode,
+		const struct file_operations *fop);
+extern struct file *alloc_file(struct vfsmount *, struct dentry *dentry,
+		mode_t mode, const struct file_operations *fop);
+
+static inline void fput_light(struct file *file, int fput_needed)
+{
+	if (unlikely(fput_needed))
+		fput(file);
+}
+
+extern struct file *fget(unsigned int fd);
+extern struct file *fget_light(unsigned int fd, int *fput_needed);
+extern void set_close_on_exec(unsigned int fd, int flag);
+extern void put_filp(struct file *);
+extern int get_unused_fd(void);
+extern int get_unused_fd_flags(int flags);
+extern void put_unused_fd(unsigned int fd);
+
+extern void fd_install(unsigned int fd, struct file *file);
+
+#endif /* __LINUX_FILE_H */
diff --git a/include/linux/init_task.h b/include/linux/init_task.h
index bf6b8a61f8d..b24c2875aa0 100644
--- a/include/linux/init_task.h
+++ b/include/linux/init_task.h
@@ -1,7 +1,7 @@
 #ifndef _LINUX__INIT_TASK_H
 #define _LINUX__INIT_TASK_H
 
-#include <linux/file.h>
+#include <linux/fdtable.h>
 #include <linux/rcupdate.h>
 #include <linux/irqflags.h>
 #include <linux/utsname.h>
diff --git a/kernel/exit.c b/kernel/exit.c
index d3ad54677f9..1510f78a0ff 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -19,6 +19,7 @@
 #include <linux/acct.h>
 #include <linux/tsacct_kern.h>
 #include <linux/file.h>
+#include <linux/fdtable.h>
 #include <linux/binfmts.h>
 #include <linux/nsproxy.h>
 #include <linux/pid_namespace.h>
diff --git a/kernel/fork.c b/kernel/fork.c
index 2bb675af4de..933e60ebcca 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -22,6 +22,7 @@
 #include <linux/mempolicy.h>
 #include <linux/sem.h>
 #include <linux/file.h>
+#include <linux/fdtable.h>
 #include <linux/key.h>
 #include <linux/binfmts.h>
 #include <linux/mman.h>
diff --git a/kernel/kmod.c b/kernel/kmod.c
index e2764047ec0..8df97d3dfda 100644
--- a/kernel/kmod.c
+++ b/kernel/kmod.c
@@ -27,6 +27,7 @@
 #include <linux/mnt_namespace.h>
 #include <linux/completion.h>
 #include <linux/file.h>
+#include <linux/fdtable.h>
 #include <linux/workqueue.h>
 #include <linux/security.h>
 #include <linux/mount.h>
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 1b50a6ebc55..1c864c0efe2 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -39,6 +39,7 @@
 #include <linux/spinlock.h>
 #include <linux/syscalls.h>
 #include <linux/file.h>
+#include <linux/fdtable.h>
 #include <linux/namei.h>
 #include <linux/mount.h>
 #include <linux/ext2_fs.h>
-- 
2.11.4.GIT