git.sesse.net Git - bcachefs-tools-debian/blob - include/linux/backing-dev.h

   1 #ifndef _LINUX_BACKING_DEV_H
   2 #define _LINUX_BACKING_DEV_H
   3
   4 typedef int (congested_fn)(void *, int);
   5
   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 */
   9 };
  10
  11 struct backing_dev_info {
  12         struct list_head bdi_list;
  13         unsigned        ra_pages;
  14         unsigned        capabilities;
  15
  16         congested_fn    *congested_fn;
  17         void            *congested_data;
  18 };
  19
  20 #define BDI_CAP_NO_ACCT_DIRTY   0x00000001
  21 #define BDI_CAP_NO_WRITEBACK    0x00000002
  22 #define BDI_CAP_NO_ACCT_WB      0x00000004
  23 #define BDI_CAP_STABLE_WRITES   0x00000008
  24 #define BDI_CAP_STRICTLIMIT     0x00000010
  25 #define BDI_CAP_CGROUP_WRITEBACK 0x00000020
  26
  27 static inline int bdi_congested(struct backing_dev_info *bdi, int cong_bits)
  28 {
  29         return 0;
  30 }
  31
  32 static inline int __must_check bdi_setup_and_register(struct backing_dev_info *bdi,
  33                                                       char *name)
  34 {
  35         bdi->capabilities = 0;
  36         return 0;
  37 }
  38
  39 static inline void bdi_destroy(struct backing_dev_info *bdi) {}
  40
  41 #define VM_MAX_READAHEAD        128     /* kbytes */
  42
  43 #endif  /* _LINUX_BACKING_DEV_H */