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         unsigned        ra_pages;
  13         unsigned        capabilities;
  14
  15         congested_fn    *congested_fn;
  16         void            *congested_data;
  17 };
  18
  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
  25
  26 static inline int bdi_congested(struct backing_dev_info *bdi, int cong_bits)
  27 {
  28         return 0;
  29 }
  30
  31 static inline int __must_check bdi_setup_and_register(struct backing_dev_info *bdi,
  32                                                       char *name)
  33 {
  34         bdi->capabilities = 0;
  35         return 0;
  36 }
  37
  38 static inline void bdi_destroy(struct backing_dev_info *bdi) {}
  39
  40 #define VM_MAX_READAHEAD        128     /* kbytes */
  41
  42 #endif  /* _LINUX_BACKING_DEV_H */