| The Android Open Source Project | a27d2ba | 2008-10-21 07:00:00 -0700 | [diff] [blame^] | 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 |