linux-master/fs/file.c

60 	set = (nfdt->max_fds - count) / BITS_PER_BYTE;
67 	set = BITBIT_SIZE(nfdt->max_fds) - cpy;
80 	BUG_ON(nfdt->max_fds < ofdt->max_fds);
82 	cpy = ofdt->max_fds * sizeof(struct file *);
83 	set = (nfdt->max_fds - ofdt->max_fds) * sizeof(struct file *);
87 	copy_fd_bitmaps(nfdt, ofdt, ofdt->max_fds);
135 	fdt->max_fds = nr;
191 	if (unlikely(new_fdt->max_fds <= nr)) {
196 	BUG_ON(nr < cur_fdt->max_fds);
225 	if (nr < fdt->max_fds)
276 	unsigned int size = fdt->max_fds;
292  * 'max_fds' will normally already be properly aligned, but it
295  * up having a 'max_fds' value that isn't already aligned.
301 static unsigned int sane_fdtable_size(struct fdtable *fdt, unsigned int max_fds)
306 	if (max_fds < NR_OPEN_DEFAULT)
307 		max_fds = NR_OPEN_DEFAULT;
308 	return ALIGN(min(count, max_fds), BITS_PER_LONG);
316 struct files_struct *dup_fd(struct files_struct *oldf, unsigned int max_fds, int *errorp)
335 	new_fdt->max_fds = NR_OPEN_DEFAULT;
343 	open_files = sane_fdtable_size(old_fdt, max_fds);
348 	while (unlikely(open_files > new_fdt->max_fds)) {
361 		if (unlikely(new_fdt->max_fds < open_files)) {
374 		open_files = sane_fdtable_size(old_fdt, max_fds);
400 	memset(new_fds, 0, (new_fdt->max_fds - open_files) * sizeof(struct file *));
425 		if (i >= fdt->max_fds)
472 		.max_fds	= NR_OPEN_DEFAULT,
484 	unsigned int maxfd = fdt->max_fds;
513 	if (fd < fdt->max_fds)
649 	if (fd >= fdt->max_fds)
652 	fd = array_index_nospec(fd, fdt->max_fds);
686 	return fdt->max_fds - 1;
833 		if (fd >= fdt->max_fds)
964 		nospec_mask = array_index_mask_nospec(fd, fdt->max_fds);
1103 		for (; fd < files_fdtable(files)->max_fds; fd++) {
1450 	for (fdt = files_fdtable(files); n < fdt->max_fds; n++) {