Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Pull vfs update from Al Viro:

 - big one - consolidation of descriptor-related logics; almost all of
   that is moved to fs/file.c

   (BTW, I'm seriously tempted to rename the result to fd.c.  As it is,
   we have a situation when file_table.c is about handling of struct
   file and file.c is about handling of descriptor tables; the reasons
   are historical - file_table.c used to be about a static array of
   struct file we used to have way back).

   A lot of stray ends got cleaned up and converted to saner primitives,
   disgusting mess in android/binder.c is still disgusting, but at least
   doesn't poke so much in descriptor table guts anymore.  A bunch of
   relatively minor races got fixed in process, plus an ext4 struct file
   leak.

 - related thing - fget_light() partially unuglified; see fdget() in
   there (and yes, it generates the code as good as we used to have).

 - also related - bits of Cyrill's procfs stuff that got entangled into
   that work; _not_ all of it, just the initial move to fs/proc/fd.c and
   switch of fdinfo to seq_file.

 - Alex's fs/coredump.c spiltoff - the same story, had been easier to
   take that commit than mess with conflicts.  The rest is a separate
   pile, this was just a mechanical code movement.

 - a few misc patches all over the place.  Not all for this cycle,
   there'll be more (and quite a few currently sit in akpm's tree)."

Fix up trivial conflicts in the android binder driver, and some fairly
simple conflicts due to two different changes to the sock_alloc_file()
interface ("take descriptor handling from sock_alloc_file() to callers"
vs "net: Providing protocol type via system.sockprotoname xattr of
/proc/PID/fd entries" adding a dentry name to the socket)

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (72 commits)
  MAX_LFS_FILESIZE should be a loff_t
  compat: fs: Generic compat_sys_sendfile implementation
  fs: push rcu_barrier() from deactivate_locked_super() to filesystems
  btrfs: reada_extent doesn't need kref for refcount
  coredump: move core dump functionality into its own file
  coredump: prevent double-free on an error path in core dumper
  usb/gadget: fix misannotations
  fcntl: fix misannotations
  ceph: don't abuse d_delete() on failure exits
  hypfs: ->d_parent is never NULL or negative
  vfs: delete surplus inode NULL check
  switch simple cases of fget_light to fdget
  new helpers: fdget()/fdput()
  switch o2hb_region_dev_write() to fget_light()
  proc_map_files_readdir(): don't bother with grabbing files
  make get_file() return its argument
  vhost_set_vring(): turn pollstart/pollstop into bool
  switch prctl_set_mm_exe_file() to fget_light()
  switch xfs_find_handle() to fget_light()
  switch xfs_swapext() to fget_light()
  ...

include/linux/compat.h

@@ -590,6 +590,9 @@ asmlinkage ssize_t compat_sys_process_vm_writev(compat_pid_t pid,
 		unsigned long liovcnt, const struct compat_iovec __user *rvec,
 		unsigned long riovcnt, unsigned long flags);
 
+asmlinkage long compat_sys_sendfile(int out_fd, int in_fd,
+				    compat_off_t __user *offset, compat_size_t count);
+
 #else
 
 #define is_compat_task() (0)

include/linux/fdtable.h

@@ -30,31 +30,11 @@ struct fdtable {
 	struct fdtable *next;
 };
 
-static inline void __set_close_on_exec(int fd, struct fdtable *fdt)
-{
-	__set_bit(fd, fdt->close_on_exec);
-}
-
-static inline void __clear_close_on_exec(int fd, struct fdtable *fdt)
-{
-	__clear_bit(fd, fdt->close_on_exec);
-}
-
 static inline bool close_on_exec(int fd, const struct fdtable *fdt)
 {
 	return test_bit(fd, fdt->close_on_exec);
 }
 
-static inline void __set_open_fd(int fd, struct fdtable *fdt)
-{
-	__set_bit(fd, fdt->open_fds);
-}
-
-static inline void __clear_open_fd(int fd, struct fdtable *fdt)
-{
-	__clear_bit(fd, fdt->open_fds);
-}
-
 static inline bool fd_is_open(int fd, const struct fdtable *fdt)
 {
 	return test_bit(fd, fdt->open_fds);
@@ -93,15 +73,8 @@ struct file_operations;
 struct vfsmount;
 struct dentry;
 
-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;
@@ -122,8 +95,20 @@ 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 *);
+void daemonize_descriptors(void);
 int unshare_files(struct files_struct **);
 struct files_struct *dup_fd(struct files_struct *, int *);
+void do_close_on_exec(struct files_struct *);
+int iterate_fd(struct files_struct *, unsigned,
+		int (*)(const void *, struct file *, unsigned),
+		const void *);
+
+extern int __alloc_fd(struct files_struct *files,
+		      unsigned start, unsigned end, unsigned flags);
+extern void __fd_install(struct files_struct *files,
+		      unsigned int fd, struct file *file);
+extern int __close_fd(struct files_struct *files,
+		      unsigned int fd);
 
 extern struct kmem_cache *files_cachep;
 

include/linux/file.h

@@ -26,15 +26,44 @@ static inline void fput_light(struct file *file, int fput_needed)
 		fput(file);
 }
 
+struct fd {
+	struct file *file;
+	int need_put;
+};
+
+static inline void fdput(struct fd fd)
+{
+	if (fd.need_put)
+		fput(fd.file);
+}
+
 extern struct file *fget(unsigned int fd);
 extern struct file *fget_light(unsigned int fd, int *fput_needed);
+
+static inline struct fd fdget(unsigned int fd)
+{
+	int b;
+	struct file *f = fget_light(fd, &b);
+	return (struct fd){f,b};
+}
+
 extern struct file *fget_raw(unsigned int fd);
 extern struct file *fget_raw_light(unsigned int fd, int *fput_needed);
+
+static inline struct fd fdget_raw(unsigned int fd)
+{
+	int b;
+	struct file *f = fget_raw_light(fd, &b);
+	return (struct fd){f,b};
+}
+
+extern int f_dupfd(unsigned int from, struct file *file, unsigned flags);
+extern int replace_fd(unsigned fd, struct file *file, unsigned flags);
 extern void set_close_on_exec(unsigned int fd, int flag);
+extern bool get_close_on_exec(unsigned int fd);
 extern void put_filp(struct file *);
-extern int alloc_fd(unsigned start, unsigned flags);
-extern int get_unused_fd(void);
-#define get_unused_fd_flags(flags) alloc_fd(0, (flags))
+extern int get_unused_fd_flags(unsigned flags);
+#define get_unused_fd() get_unused_fd_flags(0)
 extern void put_unused_fd(unsigned int fd);
 
 extern void fd_install(unsigned int fd, struct file *file);

include/linux/fs.h

@@ -1074,7 +1074,11 @@ struct file_handle {
 	unsigned char f_handle[0];
 };
 
-#define get_file(x)	atomic_long_inc(&(x)->f_count)
+static inline struct file *get_file(struct file *f)
+{
+	atomic_long_inc(&f->f_count);
+	return f;
+}
 #define fput_atomic(x)	atomic_long_add_unless(&(x)->f_count, -1, 1)
 #define file_count(x)	atomic_long_read(&(x)->f_count)
 
@@ -1126,9 +1130,9 @@ static inline int file_check_writeable(struct file *filp)
 /* Page cache limit. The filesystems should put that into their s_maxbytes 
    limits, otherwise bad things can happen in VM. */ 
 #if BITS_PER_LONG==32
-#define MAX_LFS_FILESIZE	(((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1) 
+#define MAX_LFS_FILESIZE	(((loff_t)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1) 
 #elif BITS_PER_LONG==64
-#define MAX_LFS_FILESIZE 	0x7fffffffffffffffUL
+#define MAX_LFS_FILESIZE 	((loff_t)0x7fffffffffffffff)
 #endif
 
 #define FL_POSIX	1

include/linux/net.h

@@ -65,6 +65,7 @@ typedef enum {
 struct poll_table_struct;
 struct pipe_inode_info;
 struct inode;
+struct file;
 struct net;
 
 #define SOCK_ASYNC_NOSPACE	0
@@ -246,7 +247,7 @@ extern int   	     sock_sendmsg(struct socket *sock, struct msghdr *msg,
 				  size_t len);
 extern int	     sock_recvmsg(struct socket *sock, struct msghdr *msg,
 				  size_t size, int flags);
-extern int 	     sock_map_fd(struct socket *sock, int flags);
+extern struct file  *sock_alloc_file(struct socket *sock, int flags, const char *dname);
 extern struct socket *sockfd_lookup(int fd, int *err);
 extern struct socket *sock_from_file(struct file *file, int *err);
 #define		     sockfd_put(sock) fput(sock->file)

include/linux/sched.h

@@ -405,6 +405,7 @@ static inline void arch_pick_mmap_layout(struct mm_struct *mm) {}
 
 extern void set_dumpable(struct mm_struct *mm, int value);
 extern int get_dumpable(struct mm_struct *mm);
+extern int __get_dumpable(unsigned long mm_flags);
 
 /* get/set_dumpable() values */
 #define SUID_DUMPABLE_DISABLED	0