website-struct

Struct: backing_dev_info

Status

Regular

• In 4.4: ✅

  struct backing_dev_info {
      struct list_head bdi_list;
      long unsigned int ra_pages;
      unsigned int capabilities;
      congested_fn *congested_fn;
      void *congested_data;
      char *name;
      unsigned int min_ratio;
      unsigned int max_ratio;
      unsigned int max_prop_frac;
      atomic_long_t tot_write_bandwidth;
      struct bdi_writeback wb;
      struct list_head wb_list;
      struct radix_tree_root cgwb_tree;
      struct rb_root cgwb_congested_tree;
      atomic_t usage_cnt;
      wait_queue_head_t wb_waitq;
      struct device *dev;
      struct timer_list laptop_mode_wb_timer;
      struct dentry *debug_dir;
      struct dentry *debug_stats;
  };
  

• In 4.8: ✅

  struct backing_dev_info {
      struct list_head bdi_list;
      long unsigned int ra_pages;
      unsigned int capabilities;
      congested_fn *congested_fn;
      void *congested_data;
      char *name;
      unsigned int min_ratio;
      unsigned int max_ratio;
      unsigned int max_prop_frac;
      atomic_long_t tot_write_bandwidth;
      struct bdi_writeback wb;
      struct list_head wb_list;
      struct radix_tree_root cgwb_tree;
      struct rb_root cgwb_congested_tree;
      atomic_t usage_cnt;
      wait_queue_head_t wb_waitq;
      struct device *dev;
      struct device *owner;
      struct timer_list laptop_mode_wb_timer;
      struct dentry *debug_dir;
      struct dentry *debug_stats;
  };
  

• In 4.10: ✅

  struct backing_dev_info {
      struct list_head bdi_list;
      long unsigned int ra_pages;
      long unsigned int io_pages;
      congested_fn *congested_fn;
      void *congested_data;
      char *name;
      unsigned int capabilities;
      unsigned int min_ratio;
      unsigned int max_ratio;
      unsigned int max_prop_frac;
      atomic_long_t tot_write_bandwidth;
      struct bdi_writeback wb;
      struct list_head wb_list;
      struct radix_tree_root cgwb_tree;
      struct rb_root cgwb_congested_tree;
      atomic_t usage_cnt;
      wait_queue_head_t wb_waitq;
      struct device *dev;
      struct device *owner;
      struct timer_list laptop_mode_wb_timer;
      struct dentry *debug_dir;
      struct dentry *debug_stats;
  };
  

• In 4.13: ✅

  struct backing_dev_info {
      struct list_head bdi_list;
      long unsigned int ra_pages;
      long unsigned int io_pages;
      congested_fn *congested_fn;
      void *congested_data;
      const char *name;
      struct kref refcnt;
      unsigned int capabilities;
      unsigned int min_ratio;
      unsigned int max_ratio;
      unsigned int max_prop_frac;
      atomic_long_t tot_write_bandwidth;
      struct bdi_writeback wb;
      struct list_head wb_list;
      struct radix_tree_root cgwb_tree;
      struct rb_root cgwb_congested_tree;
      wait_queue_head_t wb_waitq;
      struct device *dev;
      struct device *owner;
      struct timer_list laptop_mode_wb_timer;
      struct dentry *debug_dir;
      struct dentry *debug_stats;
  };
  

• In 4.15: ✅

  struct backing_dev_info {
      struct list_head bdi_list;
      long unsigned int ra_pages;
      long unsigned int io_pages;
      congested_fn *congested_fn;
      void *congested_data;
      const char *name;
      struct kref refcnt;
      unsigned int capabilities;
      unsigned int min_ratio;
      unsigned int max_ratio;
      unsigned int max_prop_frac;
      atomic_long_t tot_write_bandwidth;
      struct bdi_writeback wb;
      struct list_head wb_list;
      struct radix_tree_root cgwb_tree;
      struct rb_root cgwb_congested_tree;
      wait_queue_head_t wb_waitq;
      struct device *dev;
      struct device *owner;
      struct timer_list laptop_mode_wb_timer;
      struct dentry *debug_dir;
      struct dentry *debug_stats;
  };
  

• In 4.18: ✅

  struct backing_dev_info {
      struct list_head bdi_list;
      long unsigned int ra_pages;
      long unsigned int io_pages;
      congested_fn *congested_fn;
      void *congested_data;
      const char *name;
      struct kref refcnt;
      unsigned int capabilities;
      unsigned int min_ratio;
      unsigned int max_ratio;
      unsigned int max_prop_frac;
      atomic_long_t tot_write_bandwidth;
      struct bdi_writeback wb;
      struct list_head wb_list;
      struct radix_tree_root cgwb_tree;
      struct rb_root cgwb_congested_tree;
      struct mutex cgwb_release_mutex;
      wait_queue_head_t wb_waitq;
      struct device *dev;
      struct device *owner;
      struct timer_list laptop_mode_wb_timer;
      struct dentry *debug_dir;
      struct dentry *debug_stats;
  };
  

• In 5.0: ✅

  struct backing_dev_info {
      struct list_head bdi_list;
      long unsigned int ra_pages;
      long unsigned int io_pages;
      congested_fn *congested_fn;
      void *congested_data;
      const char *name;
      struct kref refcnt;
      unsigned int capabilities;
      unsigned int min_ratio;
      unsigned int max_ratio;
      unsigned int max_prop_frac;
      atomic_long_t tot_write_bandwidth;
      struct bdi_writeback wb;
      struct list_head wb_list;
      struct xarray cgwb_tree;
      struct rb_root cgwb_congested_tree;
      struct mutex cgwb_release_mutex;
      struct rw_semaphore wb_switch_rwsem;
      wait_queue_head_t wb_waitq;
      struct device *dev;
      struct device *owner;
      struct timer_list laptop_mode_wb_timer;
      struct dentry *debug_dir;
      struct dentry *debug_stats;
  };
  

• In 5.3: ✅

  struct backing_dev_info {
      struct list_head bdi_list;
      long unsigned int ra_pages;
      long unsigned int io_pages;
      congested_fn *congested_fn;
      void *congested_data;
      const char *name;
      struct kref refcnt;
      unsigned int capabilities;
      unsigned int min_ratio;
      unsigned int max_ratio;
      unsigned int max_prop_frac;
      atomic_long_t tot_write_bandwidth;
      struct bdi_writeback wb;
      struct list_head wb_list;
      struct xarray cgwb_tree;
      struct rb_root cgwb_congested_tree;
      struct mutex cgwb_release_mutex;
      struct rw_semaphore wb_switch_rwsem;
      wait_queue_head_t wb_waitq;
      struct device *dev;
      struct device *owner;
      struct timer_list laptop_mode_wb_timer;
      struct dentry *debug_dir;
  };
  

• In 5.4: ✅

  struct backing_dev_info {
      u64 id;
      struct rb_node rb_node;
      struct list_head bdi_list;
      long unsigned int ra_pages;
      long unsigned int io_pages;
      congested_fn *congested_fn;
      void *congested_data;
      const char *name;
      struct kref refcnt;
      unsigned int capabilities;
      unsigned int min_ratio;
      unsigned int max_ratio;
      unsigned int max_prop_frac;
      atomic_long_t tot_write_bandwidth;
      struct bdi_writeback wb;
      struct list_head wb_list;
      struct xarray cgwb_tree;
      struct rb_root cgwb_congested_tree;
      struct mutex cgwb_release_mutex;
      struct rw_semaphore wb_switch_rwsem;
      wait_queue_head_t wb_waitq;
      struct device *dev;
      struct device *owner;
      struct timer_list laptop_mode_wb_timer;
      struct dentry *debug_dir;
  };
  

• In 5.8: ✅

  struct backing_dev_info {
      u64 id;
      struct rb_node rb_node;
      struct list_head bdi_list;
      long unsigned int ra_pages;
      long unsigned int io_pages;
      congested_fn *congested_fn;
      void *congested_data;
      struct kref refcnt;
      unsigned int capabilities;
      unsigned int min_ratio;
      unsigned int max_ratio;
      unsigned int max_prop_frac;
      atomic_long_t tot_write_bandwidth;
      struct bdi_writeback wb;
      struct list_head wb_list;
      struct xarray cgwb_tree;
      struct rb_root cgwb_congested_tree;
      struct mutex cgwb_release_mutex;
      struct rw_semaphore wb_switch_rwsem;
      wait_queue_head_t wb_waitq;
      struct device *dev;
      char dev_name[64];
      struct device *owner;
      struct timer_list laptop_mode_wb_timer;
      struct dentry *debug_dir;
  };
  

• In 5.11: ✅

  struct backing_dev_info {
      u64 id;
      struct rb_node rb_node;
      struct list_head bdi_list;
      long unsigned int ra_pages;
      long unsigned int io_pages;
      struct kref refcnt;
      unsigned int capabilities;
      unsigned int min_ratio;
      unsigned int max_ratio;
      unsigned int max_prop_frac;
      atomic_long_t tot_write_bandwidth;
      struct bdi_writeback wb;
      struct list_head wb_list;
      struct xarray cgwb_tree;
      struct mutex cgwb_release_mutex;
      struct rw_semaphore wb_switch_rwsem;
      wait_queue_head_t wb_waitq;
      struct device *dev;
      char dev_name[64];
      struct device *owner;
      struct timer_list laptop_mode_wb_timer;
      struct dentry *debug_dir;
  };
  

• In 5.13: ✅

  struct backing_dev_info {
      u64 id;
      struct rb_node rb_node;
      struct list_head bdi_list;
      long unsigned int ra_pages;
      long unsigned int io_pages;
      struct kref refcnt;
      unsigned int capabilities;
      unsigned int min_ratio;
      unsigned int max_ratio;
      unsigned int max_prop_frac;
      atomic_long_t tot_write_bandwidth;
      struct bdi_writeback wb;
      struct list_head wb_list;
      struct xarray cgwb_tree;
      struct mutex cgwb_release_mutex;
      struct rw_semaphore wb_switch_rwsem;
      wait_queue_head_t wb_waitq;
      struct device *dev;
      char dev_name[64];
      struct device *owner;
      struct timer_list laptop_mode_wb_timer;
      struct dentry *debug_dir;
  };
  

• In 5.15: ✅

  struct backing_dev_info {
      u64 id;
      struct rb_node rb_node;
      struct list_head bdi_list;
      long unsigned int ra_pages;
      long unsigned int io_pages;
      struct kref refcnt;
      unsigned int capabilities;
      unsigned int min_ratio;
      unsigned int max_ratio;
      unsigned int max_prop_frac;
      atomic_long_t tot_write_bandwidth;
      struct bdi_writeback wb;
      struct list_head wb_list;
      struct xarray cgwb_tree;
      struct mutex cgwb_release_mutex;
      struct rw_semaphore wb_switch_rwsem;
      wait_queue_head_t wb_waitq;
      struct device *dev;
      char dev_name[64];
      struct device *owner;
      struct timer_list laptop_mode_wb_timer;
      struct dentry *debug_dir;
  };
  

• In 5.19: ✅

  struct backing_dev_info {
      u64 id;
      struct rb_node rb_node;
      struct list_head bdi_list;
      long unsigned int ra_pages;
      long unsigned int io_pages;
      struct kref refcnt;
      unsigned int capabilities;
      unsigned int min_ratio;
      unsigned int max_ratio;
      unsigned int max_prop_frac;
      atomic_long_t tot_write_bandwidth;
      struct bdi_writeback wb;
      struct list_head wb_list;
      struct xarray cgwb_tree;
      struct mutex cgwb_release_mutex;
      struct rw_semaphore wb_switch_rwsem;
      wait_queue_head_t wb_waitq;
      struct device *dev;
      char dev_name[64];
      struct device *owner;
      struct timer_list laptop_mode_wb_timer;
      struct dentry *debug_dir;
  };
  

• In 6.2: ✅

  struct backing_dev_info {
      u64 id;
      struct rb_node rb_node;
      struct list_head bdi_list;
      long unsigned int ra_pages;
      long unsigned int io_pages;
      struct kref refcnt;
      unsigned int capabilities;
      unsigned int min_ratio;
      unsigned int max_ratio;
      unsigned int max_prop_frac;
      atomic_long_t tot_write_bandwidth;
      struct bdi_writeback wb;
      struct list_head wb_list;
      struct xarray cgwb_tree;
      struct mutex cgwb_release_mutex;
      struct rw_semaphore wb_switch_rwsem;
      wait_queue_head_t wb_waitq;
      struct device *dev;
      char dev_name[64];
      struct device *owner;
      struct timer_list laptop_mode_wb_timer;
      struct dentry *debug_dir;
  };
  

• In 6.5: ✅

  struct backing_dev_info {
      u64 id;
      struct rb_node rb_node;
      struct list_head bdi_list;
      long unsigned int ra_pages;
      long unsigned int io_pages;
      struct kref refcnt;
      unsigned int capabilities;
      unsigned int min_ratio;
      unsigned int max_ratio;
      unsigned int max_prop_frac;
      atomic_long_t tot_write_bandwidth;
      struct bdi_writeback wb;
      struct list_head wb_list;
      struct xarray cgwb_tree;
      struct mutex cgwb_release_mutex;
      struct rw_semaphore wb_switch_rwsem;
      wait_queue_head_t wb_waitq;
      struct device *dev;
      char dev_name[64];
      struct device *owner;
      struct timer_list laptop_mode_wb_timer;
      struct dentry *debug_dir;
  };
  

• In 6.8: ✅

  struct backing_dev_info {
      u64 id;
      struct rb_node rb_node;
      struct list_head bdi_list;
      long unsigned int ra_pages;
      long unsigned int io_pages;
      struct kref refcnt;
      unsigned int capabilities;
      unsigned int min_ratio;
      unsigned int max_ratio;
      unsigned int max_prop_frac;
      atomic_long_t tot_write_bandwidth;
      long unsigned int last_bdp_sleep;
      struct bdi_writeback wb;
      struct list_head wb_list;
      struct xarray cgwb_tree;
      struct mutex cgwb_release_mutex;
      struct rw_semaphore wb_switch_rwsem;
      wait_queue_head_t wb_waitq;
      struct device *dev;
      char dev_name[64];
      struct device *owner;
      struct timer_list laptop_mode_wb_timer;
      struct dentry *debug_dir;
  };
  

Arch

• In arm64: ✅

  struct backing_dev_info {
      u64 id;
      struct rb_node rb_node;
      struct list_head bdi_list;
      long unsigned int ra_pages;
      long unsigned int io_pages;
      congested_fn *congested_fn;
      void *congested_data;
      const char *name;
      struct kref refcnt;
      unsigned int capabilities;
      unsigned int min_ratio;
      unsigned int max_ratio;
      unsigned int max_prop_frac;
      atomic_long_t tot_write_bandwidth;
      struct bdi_writeback wb;
      struct list_head wb_list;
      struct xarray cgwb_tree;
      struct rb_root cgwb_congested_tree;
      struct mutex cgwb_release_mutex;
      struct rw_semaphore wb_switch_rwsem;
      wait_queue_head_t wb_waitq;
      struct device *dev;
      struct device *owner;
      struct timer_list laptop_mode_wb_timer;
      struct dentry *debug_dir;
  };
  

• In armhf: ✅

  struct backing_dev_info {
      u64 id;
      struct rb_node rb_node;
      struct list_head bdi_list;
      long unsigned int ra_pages;
      long unsigned int io_pages;
      congested_fn *congested_fn;
      void *congested_data;
      const char *name;
      struct kref refcnt;
      unsigned int capabilities;
      unsigned int min_ratio;
      unsigned int max_ratio;
      unsigned int max_prop_frac;
      atomic_long_t tot_write_bandwidth;
      struct bdi_writeback wb;
      struct list_head wb_list;
      struct xarray cgwb_tree;
      struct rb_root cgwb_congested_tree;
      struct mutex cgwb_release_mutex;
      struct rw_semaphore wb_switch_rwsem;
      wait_queue_head_t wb_waitq;
      struct device *dev;
      struct device *owner;
      struct timer_list laptop_mode_wb_timer;
      struct dentry *debug_dir;
  };
  

• In ppc64el: ✅

  struct backing_dev_info {
      u64 id;
      struct rb_node rb_node;
      struct list_head bdi_list;
      long unsigned int ra_pages;
      long unsigned int io_pages;
      congested_fn *congested_fn;
      void *congested_data;
      const char *name;
      struct kref refcnt;
      unsigned int capabilities;
      unsigned int min_ratio;
      unsigned int max_ratio;
      unsigned int max_prop_frac;
      atomic_long_t tot_write_bandwidth;
      struct bdi_writeback wb;
      struct list_head wb_list;
      struct xarray cgwb_tree;
      struct rb_root cgwb_congested_tree;
      struct mutex cgwb_release_mutex;
      struct rw_semaphore wb_switch_rwsem;
      wait_queue_head_t wb_waitq;
      struct device *dev;
      struct device *owner;
      struct timer_list laptop_mode_wb_timer;
      struct dentry *debug_dir;
  };
  

• In riscv64: ✅

  struct backing_dev_info {
      u64 id;
      struct rb_node rb_node;
      struct list_head bdi_list;
      long unsigned int ra_pages;
      long unsigned int io_pages;
      congested_fn *congested_fn;
      void *congested_data;
      const char *name;
      struct kref refcnt;
      unsigned int capabilities;
      unsigned int min_ratio;
      unsigned int max_ratio;
      unsigned int max_prop_frac;
      atomic_long_t tot_write_bandwidth;
      struct bdi_writeback wb;
      struct list_head wb_list;
      struct xarray cgwb_tree;
      struct rb_root cgwb_congested_tree;
      struct mutex cgwb_release_mutex;
      struct rw_semaphore wb_switch_rwsem;
      wait_queue_head_t wb_waitq;
      struct device *dev;
      struct device *owner;
      struct timer_list laptop_mode_wb_timer;
      struct dentry *debug_dir;
  };
  

Flavor

• In aws: ✅

  struct backing_dev_info {
      u64 id;
      struct rb_node rb_node;
      struct list_head bdi_list;
      long unsigned int ra_pages;
      long unsigned int io_pages;
      congested_fn *congested_fn;
      void *congested_data;
      const char *name;
      struct kref refcnt;
      unsigned int capabilities;
      unsigned int min_ratio;
      unsigned int max_ratio;
      unsigned int max_prop_frac;
      atomic_long_t tot_write_bandwidth;
      struct bdi_writeback wb;
      struct list_head wb_list;
      struct xarray cgwb_tree;
      struct rb_root cgwb_congested_tree;
      struct mutex cgwb_release_mutex;
      struct rw_semaphore wb_switch_rwsem;
      wait_queue_head_t wb_waitq;
      struct device *dev;
      struct device *owner;
      struct timer_list laptop_mode_wb_timer;
      struct dentry *debug_dir;
  };
  

• In azure: ✅

  struct backing_dev_info {
      u64 id;
      struct rb_node rb_node;
      struct list_head bdi_list;
      long unsigned int ra_pages;
      long unsigned int io_pages;
      congested_fn *congested_fn;
      void *congested_data;
      const char *name;
      struct kref refcnt;
      unsigned int capabilities;
      unsigned int min_ratio;
      unsigned int max_ratio;
      unsigned int max_prop_frac;
      atomic_long_t tot_write_bandwidth;
      struct bdi_writeback wb;
      struct list_head wb_list;
      struct xarray cgwb_tree;
      struct rb_root cgwb_congested_tree;
      struct mutex cgwb_release_mutex;
      struct rw_semaphore wb_switch_rwsem;
      wait_queue_head_t wb_waitq;
      struct device *dev;
      struct device *owner;
      struct timer_list laptop_mode_wb_timer;
      struct dentry *debug_dir;
  };
  

• In gcp: ✅

  struct backing_dev_info {
      u64 id;
      struct rb_node rb_node;
      struct list_head bdi_list;
      long unsigned int ra_pages;
      long unsigned int io_pages;
      congested_fn *congested_fn;
      void *congested_data;
      const char *name;
      struct kref refcnt;
      unsigned int capabilities;
      unsigned int min_ratio;
      unsigned int max_ratio;
      unsigned int max_prop_frac;
      atomic_long_t tot_write_bandwidth;
      struct bdi_writeback wb;
      struct list_head wb_list;
      struct xarray cgwb_tree;
      struct rb_root cgwb_congested_tree;
      struct mutex cgwb_release_mutex;
      struct rw_semaphore wb_switch_rwsem;
      wait_queue_head_t wb_waitq;
      struct device *dev;
      struct device *owner;
      struct timer_list laptop_mode_wb_timer;
      struct dentry *debug_dir;
  };
  

• In lowlatency: ✅

  struct backing_dev_info {
      u64 id;
      struct rb_node rb_node;
      struct list_head bdi_list;
      long unsigned int ra_pages;
      long unsigned int io_pages;
      congested_fn *congested_fn;
      void *congested_data;
      const char *name;
      struct kref refcnt;
      unsigned int capabilities;
      unsigned int min_ratio;
      unsigned int max_ratio;
      unsigned int max_prop_frac;
      atomic_long_t tot_write_bandwidth;
      struct bdi_writeback wb;
      struct list_head wb_list;
      struct xarray cgwb_tree;
      struct rb_root cgwb_congested_tree;
      struct mutex cgwb_release_mutex;
      struct rw_semaphore wb_switch_rwsem;
      wait_queue_head_t wb_waitq;
      struct device *dev;
      struct device *owner;
      struct timer_list laptop_mode_wb_timer;
      struct dentry *debug_dir;
  };
  

Differences

Regular

• Changed between 4.4 and 4.8 ⚠️

  • Field added. struct device *owner
• Changed between 4.8 and 4.10 ⚠️

  • Field added. long unsigned int io_pages
• Changed between 4.10 and 4.13 ⚠️

  • Field added. struct kref refcnt
  • Field removed. atomic_t usage_cnt
  • Field type changed. char *name ➡️ const char *name
• No changes between 4.13 and 4.15 ✅
• Changed between 4.15 and 4.18 ⚠️

  • Field added. struct mutex cgwb_release_mutex
• Changed between 4.18 and 5.0 ⚠️

  • Field added. struct rw_semaphore wb_switch_rwsem
  • Field type changed. struct radix_tree_root cgwb_tree ➡️ struct xarray cgwb_tree
• Changed between 5.0 and 5.3 ⚠️

  • Field removed. struct dentry *debug_stats
• Changed between 5.3 and 5.4 ⚠️

  • Field added. u64 id
  • Field added. struct rb_node rb_node
• Changed between 5.4 and 5.8 ⚠️

  • Field added. char dev_name[64]
  • Field removed. const char *name
• Changed between 5.8 and 5.11 ⚠️

  • Field removed. congested_fn *congested_fn
  • Field removed. void *congested_data
  • Field removed. struct rb_root cgwb_congested_tree
• No changes between 5.11 and 5.13 ✅
• No changes between 5.13 and 5.15 ✅
• No changes between 5.15 and 5.19 ✅
• No changes between 5.19 and 6.2 ✅
• No changes between 6.2 and 6.5 ✅
• Changed between 6.5 and 6.8 ⚠️

  • Field added. long unsigned int last_bdp_sleep

Arch

• No changes between amd64 and arm64 ✅
• No changes between amd64 and armhf ✅
• No changes between amd64 and ppc64el ✅
• No changes between amd64 and riscv64 ✅

Flavor

• No changes between generic and aws ✅
• No changes between generic and azure ✅
• No changes between generic and gcp ✅
• No changes between generic and lowlatency ✅