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

   1 #ifndef _LINUX_BACKING_DEV_H
   2 #define _LINUX_BACKING_DEV_H
   3
   4 #include <linux/list.h>
   5
   6 typedef int (congested_fn)(void *, int);
   7
   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 */
  11 };
  12
  13 struct backing_dev_info {
  14         struct list_head bdi_list;
  15         unsigned        ra_pages;
  16         unsigned        capabilities;
  17
  18         congested_fn    *congested_fn;
  19         void            *congested_data;
  20 };
  21
  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
  28
  29 static inline int bdi_congested(struct backing_dev_info *bdi, int cong_bits)
  30 {
  31         return 0;
  32 }
  33
  34 static inline int __must_check bdi_setup_and_register(struct backing_dev_info *bdi,
  35                                                       char *name)
  36 {
  37         bdi->capabilities = 0;
  38         return 0;
  39 }
  40
  41 static inline void bdi_destroy(struct backing_dev_info *bdi) {}
  42
  43 #define VM_MAX_READAHEAD        128     /* kbytes */
  44
  45 #endif  /* _LINUX_BACKING_DEV_H */