diff options
Diffstat (limited to 'ANDROID_3.4.5/include/linux/backing-dev.h')
| -rw-r--r-- | ANDROID_3.4.5/include/linux/backing-dev.h | 356 |
1 files changed, 0 insertions, 356 deletions
diff --git a/ANDROID_3.4.5/include/linux/backing-dev.h b/ANDROID_3.4.5/include/linux/backing-dev.h deleted file mode 100644 index b1038bd6..00000000 --- a/ANDROID_3.4.5/include/linux/backing-dev.h +++ /dev/null @@ -1,356 +0,0 @@ -/* - * include/linux/backing-dev.h - * - * low-level device information and state which is propagated up through - * to high-level code. - */ - -#ifndef _LINUX_BACKING_DEV_H -#define _LINUX_BACKING_DEV_H - -#include <linux/percpu_counter.h> -#include <linux/log2.h> -#include <linux/proportions.h> -#include <linux/kernel.h> -#include <linux/fs.h> -#include <linux/sched.h> -#include <linux/timer.h> -#include <linux/writeback.h> -#include <linux/atomic.h> - -struct page; -struct device; -struct dentry; - -/* - * Bits in backing_dev_info.state - */ -enum bdi_state { - BDI_pending, /* On its way to being activated */ - BDI_wb_alloc, /* Default embedded wb allocated */ - BDI_async_congested, /* The async (write) queue is getting full */ - BDI_sync_congested, /* The sync queue is getting full */ - BDI_registered, /* bdi_register() was done */ - BDI_writeback_running, /* Writeback is in progress */ - BDI_unused, /* Available bits start here */ -}; - -typedef int (congested_fn)(void *, int); - -enum bdi_stat_item { - BDI_RECLAIMABLE, - BDI_WRITEBACK, - BDI_DIRTIED, - BDI_WRITTEN, - NR_BDI_STAT_ITEMS -}; - -#define BDI_STAT_BATCH (8*(1+ilog2(nr_cpu_ids))) - -struct bdi_writeback { - struct backing_dev_info *bdi; /* our parent bdi */ - unsigned int nr; - - unsigned long last_old_flush; /* last old data flush */ - unsigned long last_active; /* last time bdi thread was active */ - - struct task_struct *task; /* writeback thread */ - struct timer_list wakeup_timer; /* used for delayed bdi thread wakeup */ - struct list_head b_dirty; /* dirty inodes */ - struct list_head b_io; /* parked for writeback */ - struct list_head b_more_io; /* parked for more writeback */ - spinlock_t list_lock; /* protects the b_* lists */ -}; - -struct backing_dev_info { - struct list_head bdi_list; - unsigned long ra_pages; /* max readahead in PAGE_CACHE_SIZE units */ - unsigned long state; /* Always use atomic bitops on this */ - unsigned int capabilities; /* Device capabilities */ - congested_fn *congested_fn; /* Function pointer if device is md/dm */ - void *congested_data; /* Pointer to aux data for congested func */ - - char *name; - - struct percpu_counter bdi_stat[NR_BDI_STAT_ITEMS]; - - unsigned long bw_time_stamp; /* last time write bw is updated */ - unsigned long dirtied_stamp; - unsigned long written_stamp; /* pages written at bw_time_stamp */ - unsigned long write_bandwidth; /* the estimated write bandwidth */ - unsigned long avg_write_bandwidth; /* further smoothed write bw */ - - /* - * The base dirty throttle rate, re-calculated on every 200ms. - * All the bdi tasks' dirty rate will be curbed under it. - * @dirty_ratelimit tracks the estimated @balanced_dirty_ratelimit - * in small steps and is much more smooth/stable than the latter. - */ - unsigned long dirty_ratelimit; - unsigned long balanced_dirty_ratelimit; - - struct prop_local_percpu completions; - int dirty_exceeded; - - unsigned int min_ratio; - unsigned int max_ratio, max_prop_frac; - - struct bdi_writeback wb; /* default writeback info for this bdi */ - spinlock_t wb_lock; /* protects work_list */ - - struct list_head work_list; - - struct device *dev; - - struct timer_list laptop_mode_wb_timer; - -#ifdef CONFIG_DEBUG_FS - struct dentry *debug_dir; - struct dentry *debug_stats; -#endif -}; - -int bdi_init(struct backing_dev_info *bdi); -void bdi_destroy(struct backing_dev_info *bdi); - -int bdi_register(struct backing_dev_info *bdi, struct device *parent, - const char *fmt, ...); -int bdi_register_dev(struct backing_dev_info *bdi, dev_t dev); -void bdi_unregister(struct backing_dev_info *bdi); -int bdi_setup_and_register(struct backing_dev_info *, char *, unsigned int); -void bdi_start_writeback(struct backing_dev_info *bdi, long nr_pages, - enum wb_reason reason); -void bdi_start_background_writeback(struct backing_dev_info *bdi); -int bdi_writeback_thread(void *data); -int bdi_has_dirty_io(struct backing_dev_info *bdi); -void bdi_arm_supers_timer(void); -void bdi_wakeup_thread_delayed(struct backing_dev_info *bdi); -void bdi_lock_two(struct bdi_writeback *wb1, struct bdi_writeback *wb2); - -extern spinlock_t bdi_lock; -extern struct list_head bdi_list; -extern struct list_head bdi_pending_list; - -static inline int wb_has_dirty_io(struct bdi_writeback *wb) -{ - return !list_empty(&wb->b_dirty) || - !list_empty(&wb->b_io) || - !list_empty(&wb->b_more_io); -} - -static inline void __add_bdi_stat(struct backing_dev_info *bdi, - enum bdi_stat_item item, s64 amount) -{ - __percpu_counter_add(&bdi->bdi_stat[item], amount, BDI_STAT_BATCH); -} - -static inline void __inc_bdi_stat(struct backing_dev_info *bdi, - enum bdi_stat_item item) -{ - __add_bdi_stat(bdi, item, 1); -} - -static inline void inc_bdi_stat(struct backing_dev_info *bdi, - enum bdi_stat_item item) -{ - unsigned long flags; - - local_irq_save(flags); - __inc_bdi_stat(bdi, item); - local_irq_restore(flags); -} - -static inline void __dec_bdi_stat(struct backing_dev_info *bdi, - enum bdi_stat_item item) -{ - __add_bdi_stat(bdi, item, -1); -} - -static inline void dec_bdi_stat(struct backing_dev_info *bdi, - enum bdi_stat_item item) -{ - unsigned long flags; - - local_irq_save(flags); - __dec_bdi_stat(bdi, item); - local_irq_restore(flags); -} - -static inline s64 bdi_stat(struct backing_dev_info *bdi, - enum bdi_stat_item item) -{ - return percpu_counter_read_positive(&bdi->bdi_stat[item]); -} - -static inline s64 __bdi_stat_sum(struct backing_dev_info *bdi, - enum bdi_stat_item item) -{ - return percpu_counter_sum_positive(&bdi->bdi_stat[item]); -} - -static inline s64 bdi_stat_sum(struct backing_dev_info *bdi, - enum bdi_stat_item item) -{ - s64 sum; - unsigned long flags; - - local_irq_save(flags); - sum = __bdi_stat_sum(bdi, item); - local_irq_restore(flags); - - return sum; -} - -extern void bdi_writeout_inc(struct backing_dev_info *bdi); - -/* - * maximal error of a stat counter. - */ -static inline unsigned long bdi_stat_error(struct backing_dev_info *bdi) -{ -#ifdef CONFIG_SMP - return nr_cpu_ids * BDI_STAT_BATCH; -#else - return 1; -#endif -} - -int bdi_set_min_ratio(struct backing_dev_info *bdi, unsigned int min_ratio); -int bdi_set_max_ratio(struct backing_dev_info *bdi, unsigned int max_ratio); - -/* - * Flags in backing_dev_info::capability - * - * The first three flags control whether dirty pages will contribute to the - * VM's accounting and whether writepages() should be called for dirty pages - * (something that would not, for example, be appropriate for ramfs) - * - * WARNING: these flags are closely related and should not normally be - * used separately. The BDI_CAP_NO_ACCT_AND_WRITEBACK combines these - * three flags into a single convenience macro. - * - * BDI_CAP_NO_ACCT_DIRTY: Dirty pages shouldn't contribute to accounting - * BDI_CAP_NO_WRITEBACK: Don't write pages back - * BDI_CAP_NO_ACCT_WB: Don't automatically account writeback pages - * - * These flags let !MMU mmap() govern direct device mapping vs immediate - * copying more easily for MAP_PRIVATE, especially for ROM filesystems. - * - * BDI_CAP_MAP_COPY: Copy can be mapped (MAP_PRIVATE) - * BDI_CAP_MAP_DIRECT: Can be mapped directly (MAP_SHARED) - * BDI_CAP_READ_MAP: Can be mapped for reading - * BDI_CAP_WRITE_MAP: Can be mapped for writing - * BDI_CAP_EXEC_MAP: Can be mapped for execution - * - * BDI_CAP_SWAP_BACKED: Count shmem/tmpfs objects as swap-backed. - */ -#define BDI_CAP_NO_ACCT_DIRTY 0x00000001 -#define BDI_CAP_NO_WRITEBACK 0x00000002 -#define BDI_CAP_MAP_COPY 0x00000004 -#define BDI_CAP_MAP_DIRECT 0x00000008 -#define BDI_CAP_READ_MAP 0x00000010 -#define BDI_CAP_WRITE_MAP 0x00000020 -#define BDI_CAP_EXEC_MAP 0x00000040 -#define BDI_CAP_NO_ACCT_WB 0x00000080 -#define BDI_CAP_SWAP_BACKED 0x00000100 - -#define BDI_CAP_VMFLAGS \ - (BDI_CAP_READ_MAP | BDI_CAP_WRITE_MAP | BDI_CAP_EXEC_MAP) - -#define BDI_CAP_NO_ACCT_AND_WRITEBACK \ - (BDI_CAP_NO_WRITEBACK | BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_ACCT_WB) - -#if defined(VM_MAYREAD) && \ - (BDI_CAP_READ_MAP != VM_MAYREAD || \ - BDI_CAP_WRITE_MAP != VM_MAYWRITE || \ - BDI_CAP_EXEC_MAP != VM_MAYEXEC) -#error please change backing_dev_info::capabilities flags -#endif - -extern struct backing_dev_info default_backing_dev_info; -extern struct backing_dev_info noop_backing_dev_info; - -int writeback_in_progress(struct backing_dev_info *bdi); - -static inline int bdi_congested(struct backing_dev_info *bdi, int bdi_bits) -{ - if (bdi->congested_fn) - return bdi->congested_fn(bdi->congested_data, bdi_bits); - return (bdi->state & bdi_bits); -} - -static inline int bdi_read_congested(struct backing_dev_info *bdi) -{ - return bdi_congested(bdi, 1 << BDI_sync_congested); -} - -static inline int bdi_write_congested(struct backing_dev_info *bdi) -{ - return bdi_congested(bdi, 1 << BDI_async_congested); -} - -static inline int bdi_rw_congested(struct backing_dev_info *bdi) -{ - return bdi_congested(bdi, (1 << BDI_sync_congested) | - (1 << BDI_async_congested)); -} - -enum { - BLK_RW_ASYNC = 0, - BLK_RW_SYNC = 1, -}; - -void clear_bdi_congested(struct backing_dev_info *bdi, int sync); -void set_bdi_congested(struct backing_dev_info *bdi, int sync); -long congestion_wait(int sync, long timeout); -long wait_iff_congested(struct zone *zone, int sync, long timeout); - -static inline bool bdi_cap_writeback_dirty(struct backing_dev_info *bdi) -{ - return !(bdi->capabilities & BDI_CAP_NO_WRITEBACK); -} - -static inline bool bdi_cap_account_dirty(struct backing_dev_info *bdi) -{ - return !(bdi->capabilities & BDI_CAP_NO_ACCT_DIRTY); -} - -static inline bool bdi_cap_account_writeback(struct backing_dev_info *bdi) -{ - /* Paranoia: BDI_CAP_NO_WRITEBACK implies BDI_CAP_NO_ACCT_WB */ - return !(bdi->capabilities & (BDI_CAP_NO_ACCT_WB | - BDI_CAP_NO_WRITEBACK)); -} - -static inline bool bdi_cap_swap_backed(struct backing_dev_info *bdi) -{ - return bdi->capabilities & BDI_CAP_SWAP_BACKED; -} - -static inline bool bdi_cap_flush_forker(struct backing_dev_info *bdi) -{ - return bdi == &default_backing_dev_info; -} - -static inline bool mapping_cap_writeback_dirty(struct address_space *mapping) -{ - return bdi_cap_writeback_dirty(mapping->backing_dev_info); -} - -static inline bool mapping_cap_account_dirty(struct address_space *mapping) -{ - return bdi_cap_account_dirty(mapping->backing_dev_info); -} - -static inline bool mapping_cap_swap_backed(struct address_space *mapping) -{ - return bdi_cap_swap_backed(mapping->backing_dev_info); -} - -static inline int bdi_sched_wait(void *word) -{ - schedule(); - return 0; -} - -#endif /* _LINUX_BACKING_DEV_H */ |