make __set_open_fd() set cloexec state as well

->close_on_exec[] state is maintained only for opened descriptors;
as the result, anything that marks a descriptor opened has to
set its cloexec state explicitly.

As the result, all calls of __set_open_fd() are followed by
__set_close_on_exec(); might as well fold it into __set_open_fd()
so that cloexec state is defined as soon as the descriptor is
marked opened.

[braino fix folded]

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

Author: Al Viro

fs/file.c

@@ -248,9 +248,10 @@ static inline void __set_close_on_exec(unsigned int fd, struct fdtable *fdt,
 	}
 }
 
-static inline void __set_open_fd(unsigned int fd, struct fdtable *fdt)
+static inline void __set_open_fd(unsigned int fd, struct fdtable *fdt, bool set)
 {
 	__set_bit(fd, fdt->open_fds);
+	__set_close_on_exec(fd, fdt, set);
 	fd /= BITS_PER_LONG;
 	if (!~fdt->open_fds[fd])
 		__set_bit(fd, fdt->full_fds_bits);
@@ -517,8 +518,7 @@ static int alloc_fd(unsigned start, unsigned end, unsigned flags)
 	if (start <= files->next_fd)
 		files->next_fd = fd + 1;
 
-	__set_open_fd(fd, fdt);
-	__set_close_on_exec(fd, fdt, flags & O_CLOEXEC);
+	__set_open_fd(fd, fdt, flags & O_CLOEXEC);
 	error = fd;
 
 out:
@@ -1186,8 +1186,7 @@ __releases(&files->file_lock)
 		goto Ebusy;
 	get_file(file);
 	rcu_assign_pointer(fdt->fd[fd], file);
-	__set_open_fd(fd, fdt);
-	__set_close_on_exec(fd, fdt, flags & O_CLOEXEC);
+	__set_open_fd(fd, fdt, flags & O_CLOEXEC);
 	spin_unlock(&files->file_lock);
 
 	if (tofree)