1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_SWAPFILE_H
3 #define _LINUX_SWAPFILE_H
4 
5 /*
6  * these were static in swapfile.c but frontswap.c needs them and we don't
7  * want to expose them to the dozens of source files that include swap.h
8  */
9 extern spinlock_t swap_lock;
10 extern struct plist_head swap_active_head;
11 extern struct swap_info_struct *swap_info[];
12 extern int try_to_unuse(unsigned int, bool, unsigned long);
13 extern unsigned long generic_max_swapfile_size(void);
14 extern unsigned long max_swapfile_size(void);
15 
16 #endif /* _LINUX_SWAPFILE_H */
17