29 static int expand_files(struct files_struct *files, int nr)  in expand_files()  argument
36 	if (nr >= files->max_fdset) {  in expand_files()
38 		if ((err = expand_fdset(files, nr)))  in expand_files()
41 	if (nr >= files->max_fds) {  in expand_files()
43 		if ((err = expand_fd_array(files, nr)))  in expand_files()
61 static int locate_fd(struct files_struct *files,   in locate_fd()  argument
68 	write_lock(&files->file_lock);  in locate_fd()
80 	if (start < files->next_fd)  in locate_fd()
81 		start = files->next_fd;  in locate_fd()
84 	if (start < files->max_fdset) {  in locate_fd()
85 		newfd = find_next_zero_bit(files->open_fds->fds_bits,  in locate_fd()
86 			files->max_fdset, start);  in locate_fd()
93 	error = expand_files(files, newfd);  in locate_fd()
104 	if (start <= files->next_fd)  in locate_fd()
105 		files->next_fd = newfd + 1;  in locate_fd()
113 static inline void allocate_fd(struct files_struct *files,   in allocate_fd()  argument
116 	FD_SET(fd, files->open_fds);  in allocate_fd()
117 	FD_CLR(fd, files->close_on_exec);  in allocate_fd()
118 	write_unlock(&files->file_lock);  in allocate_fd()
124 	struct files_struct * files = current->files;  in dupfd()  local
127 	ret = locate_fd(files, file, start);  in dupfd()
130 	allocate_fd(files, file, ret);  in dupfd()
134 	write_unlock(&files->file_lock);  in dupfd()
143 	struct files_struct * files = current->files;  in sys_dup2()  local
145 	write_lock(&files->file_lock);  in sys_dup2()
156 	err = expand_files(files, newfd);  in sys_dup2()
169 	tofree = files->fd[newfd];  in sys_dup2()
170 	if (!tofree && FD_ISSET(newfd, files->open_fds))  in sys_dup2()
173 	files->fd[newfd] = file;  in sys_dup2()
174 	FD_SET(newfd, files->open_fds);  in sys_dup2()
175 	FD_CLR(newfd, files->close_on_exec);  in sys_dup2()
176 	write_unlock(&files->file_lock);  in sys_dup2()
179 		filp_close(tofree, files);  in sys_dup2()
184 	write_unlock(&files->file_lock);  in sys_dup2()
188 	write_unlock(&files->file_lock);  in sys_dup2()