1 /**************************************************************************** 2 **************************************************************************** 3 *** 4 *** This header was automatically generated from a Linux kernel header 5 *** of the same name, to make information necessary for userspace to 6 *** call into the kernel available to libc. It contains only constants, 7 *** structures, and macros generated from the original header, and thus, 8 *** contains no copyrightable information. 9 *** 10 **************************************************************************** 11 ****************************************************************************/ 12 #ifndef _LINUX_BACKING_DEV_H 13 #define _LINUX_BACKING_DEV_H 14 15 #include <asm/atomic.h> 16 17 enum bdi_state { 18 BDI_pdflush, 19 BDI_write_congested, 20 BDI_read_congested, 21 BDI_unused, 22 }; 23 24 typedef int (congested_fn)(void *, int); 25 26 struct backing_dev_info { 27 unsigned long ra_pages; 28 unsigned long state; 29 unsigned int capabilities; 30 congested_fn *congested_fn; 31 void *congested_data; 32 void (*unplug_io_fn)(struct backing_dev_info *, struct page *); 33 void *unplug_io_data; 34 }; 35 36 #define BDI_CAP_NO_ACCT_DIRTY 0x00000001 37 #define BDI_CAP_NO_WRITEBACK 0x00000002 38 #define BDI_CAP_MAP_COPY 0x00000004 39 #define BDI_CAP_MAP_DIRECT 0x00000008 40 #define BDI_CAP_READ_MAP 0x00000010 41 #define BDI_CAP_WRITE_MAP 0x00000020 42 #define BDI_CAP_EXEC_MAP 0x00000040 43 #define BDI_CAP_VMFLAGS (BDI_CAP_READ_MAP | BDI_CAP_WRITE_MAP | BDI_CAP_EXEC_MAP) 44 45 #if defined(VM_MAYREAD) && BDI_CAP_READ_MAP != (VM_MAYREAD || BDI_CAP_WRITE_MAP != (VM_MAYWRITE || BDI_CAP_EXEC_MAP != VM_MAYEXEC)) 46 #error please change backing_dev_info::capabilities flags 47 #endif 48 49 #define bdi_cap_writeback_dirty(bdi) (!((bdi)->capabilities & BDI_CAP_NO_WRITEBACK)) 50 #define bdi_cap_account_dirty(bdi) (!((bdi)->capabilities & BDI_CAP_NO_ACCT_DIRTY)) 51 #define mapping_cap_writeback_dirty(mapping) bdi_cap_writeback_dirty((mapping)->backing_dev_info) 52 #define mapping_cap_account_dirty(mapping) bdi_cap_account_dirty((mapping)->backing_dev_info) 53 #endif 54