1 #ifndef _LINUX_BACKING_DEV_H
2 #define _LINUX_BACKING_DEV_H
4 typedef int (congested_fn)(void *, int);
6 enum wb_congested_state {
7 WB_async_congested, /* The async (write) queue is getting full */
8 WB_sync_congested, /* The sync queue is getting full */
11 struct backing_dev_info {
13 unsigned capabilities;
15 congested_fn *congested_fn;
19 #define BDI_CAP_NO_ACCT_DIRTY 0x00000001
20 #define BDI_CAP_NO_WRITEBACK 0x00000002
21 #define BDI_CAP_NO_ACCT_WB 0x00000004
22 #define BDI_CAP_STABLE_WRITES 0x00000008
23 #define BDI_CAP_STRICTLIMIT 0x00000010
24 #define BDI_CAP_CGROUP_WRITEBACK 0x00000020
26 static inline int bdi_congested(struct backing_dev_info *bdi, int cong_bits)
31 static inline int __must_check bdi_setup_and_register(struct backing_dev_info *bdi,
34 bdi->capabilities = 0;
38 static inline void bdi_destroy(struct backing_dev_info *bdi) {}
40 #define VM_MAX_READAHEAD 128 /* kbytes */
42 #endif /* _LINUX_BACKING_DEV_H */