1 #ifndef _LINUX_BACKING_DEV_H
2 #define _LINUX_BACKING_DEV_H
4 #include <linux/list.h>
6 typedef int (congested_fn)(void *, int);
8 enum wb_congested_state {
9 WB_async_congested, /* The async (write) queue is getting full */
10 WB_sync_congested, /* The sync queue is getting full */
13 struct backing_dev_info {
14 struct list_head bdi_list;
16 unsigned capabilities;
18 congested_fn *congested_fn;
22 #define BDI_CAP_NO_ACCT_DIRTY 0x00000001
23 #define BDI_CAP_NO_WRITEBACK 0x00000002
24 #define BDI_CAP_NO_ACCT_WB 0x00000004
25 #define BDI_CAP_STABLE_WRITES 0x00000008
26 #define BDI_CAP_STRICTLIMIT 0x00000010
27 #define BDI_CAP_CGROUP_WRITEBACK 0x00000020
29 static inline int bdi_congested(struct backing_dev_info *bdi, int cong_bits)
34 static inline int __must_check bdi_setup_and_register(struct backing_dev_info *bdi,
37 bdi->capabilities = 0;
41 static inline void bdi_destroy(struct backing_dev_info *bdi) {}
43 #define VM_MAX_READAHEAD 128 /* kbytes */
45 #endif /* _LINUX_BACKING_DEV_H */