Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * include/linux/backing-dev.h |
| 3 | * |
| 4 | * low-level device information and state which is propagated up through |
| 5 | * to high-level code. |
| 6 | */ |
| 7 | |
| 8 | #ifndef _LINUX_BACKING_DEV_H |
| 9 | #define _LINUX_BACKING_DEV_H |
| 10 | |
Peter Zijlstra | b2e8fb6 | 2007-10-16 23:25:47 -0700 | [diff] [blame] | 11 | #include <linux/percpu_counter.h> |
| 12 | #include <linux/log2.h> |
Peter Zijlstra | 04fbfdc | 2007-10-16 23:25:50 -0700 | [diff] [blame] | 13 | #include <linux/proportions.h> |
Peter Zijlstra | cf0ca9f | 2008-04-30 00:54:32 -0700 | [diff] [blame] | 14 | #include <linux/kernel.h> |
Miklos Szeredi | e4ad08f | 2008-04-30 00:54:37 -0700 | [diff] [blame] | 15 | #include <linux/fs.h> |
Jens Axboe | 03ba378 | 2009-09-09 09:08:54 +0200 | [diff] [blame] | 16 | #include <linux/sched.h> |
Matthew Garrett | 31373d0 | 2010-04-06 14:25:14 +0200 | [diff] [blame] | 17 | #include <linux/timer.h> |
Jens Axboe | 03ba378 | 2009-09-09 09:08:54 +0200 | [diff] [blame] | 18 | #include <linux/writeback.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <asm/atomic.h> |
| 20 | |
Andrew Morton | 3fcfab1 | 2006-10-19 23:28:16 -0700 | [diff] [blame] | 21 | struct page; |
Peter Zijlstra | cf0ca9f | 2008-04-30 00:54:32 -0700 | [diff] [blame] | 22 | struct device; |
Miklos Szeredi | 76f1418 | 2008-04-30 00:54:36 -0700 | [diff] [blame] | 23 | struct dentry; |
Andrew Morton | 3fcfab1 | 2006-10-19 23:28:16 -0700 | [diff] [blame] | 24 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | /* |
| 26 | * Bits in backing_dev_info.state |
| 27 | */ |
| 28 | enum bdi_state { |
Jens Axboe | 03ba378 | 2009-09-09 09:08:54 +0200 | [diff] [blame] | 29 | BDI_pending, /* On its way to being activated */ |
| 30 | BDI_wb_alloc, /* Default embedded wb allocated */ |
Jens Axboe | 1faa16d | 2009-04-06 14:48:01 +0200 | [diff] [blame] | 31 | BDI_async_congested, /* The async (write) queue is getting full */ |
| 32 | BDI_sync_congested, /* The sync queue is getting full */ |
Jens Axboe | 500b067 | 2009-09-09 09:10:25 +0200 | [diff] [blame] | 33 | BDI_registered, /* bdi_register() was done */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | BDI_unused, /* Available bits start here */ |
| 35 | }; |
| 36 | |
| 37 | typedef int (congested_fn)(void *, int); |
| 38 | |
Peter Zijlstra | b2e8fb6 | 2007-10-16 23:25:47 -0700 | [diff] [blame] | 39 | enum bdi_stat_item { |
Peter Zijlstra | c9e51e4 | 2007-10-16 23:25:47 -0700 | [diff] [blame] | 40 | BDI_RECLAIMABLE, |
Peter Zijlstra | 69cb51d | 2007-10-16 23:25:48 -0700 | [diff] [blame] | 41 | BDI_WRITEBACK, |
Peter Zijlstra | b2e8fb6 | 2007-10-16 23:25:47 -0700 | [diff] [blame] | 42 | NR_BDI_STAT_ITEMS |
| 43 | }; |
| 44 | |
| 45 | #define BDI_STAT_BATCH (8*(1+ilog2(nr_cpu_ids))) |
| 46 | |
Jens Axboe | 03ba378 | 2009-09-09 09:08:54 +0200 | [diff] [blame] | 47 | struct bdi_writeback { |
Jens Axboe | 03ba378 | 2009-09-09 09:08:54 +0200 | [diff] [blame] | 48 | struct backing_dev_info *bdi; /* our parent bdi */ |
| 49 | unsigned int nr; |
| 50 | |
| 51 | unsigned long last_old_flush; /* last old data flush */ |
| 52 | |
| 53 | struct task_struct *task; /* writeback task */ |
| 54 | struct list_head b_dirty; /* dirty inodes */ |
| 55 | struct list_head b_io; /* parked for writeback */ |
| 56 | struct list_head b_more_io; /* parked for more writeback */ |
| 57 | }; |
| 58 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | struct backing_dev_info { |
Jens Axboe | 66f3b8e | 2009-09-02 09:19:46 +0200 | [diff] [blame] | 60 | struct list_head bdi_list; |
Jens Axboe | cfc4ba5 | 2009-09-14 13:12:40 +0200 | [diff] [blame] | 61 | struct rcu_head rcu_head; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | unsigned long ra_pages; /* max readahead in PAGE_CACHE_SIZE units */ |
| 63 | unsigned long state; /* Always use atomic bitops on this */ |
| 64 | unsigned int capabilities; /* Device capabilities */ |
| 65 | congested_fn *congested_fn; /* Function pointer if device is md/dm */ |
| 66 | void *congested_data; /* Pointer to aux data for congested func */ |
| 67 | void (*unplug_io_fn)(struct backing_dev_info *, struct page *); |
| 68 | void *unplug_io_data; |
Peter Zijlstra | b2e8fb6 | 2007-10-16 23:25:47 -0700 | [diff] [blame] | 69 | |
Jens Axboe | d993831 | 2009-06-12 14:45:52 +0200 | [diff] [blame] | 70 | char *name; |
| 71 | |
Peter Zijlstra | b2e8fb6 | 2007-10-16 23:25:47 -0700 | [diff] [blame] | 72 | struct percpu_counter bdi_stat[NR_BDI_STAT_ITEMS]; |
Peter Zijlstra | 04fbfdc | 2007-10-16 23:25:50 -0700 | [diff] [blame] | 73 | |
| 74 | struct prop_local_percpu completions; |
| 75 | int dirty_exceeded; |
Peter Zijlstra | cf0ca9f | 2008-04-30 00:54:32 -0700 | [diff] [blame] | 76 | |
Peter Zijlstra | 189d3c4 | 2008-04-30 00:54:35 -0700 | [diff] [blame] | 77 | unsigned int min_ratio; |
Peter Zijlstra | a42dde0 | 2008-04-30 00:54:36 -0700 | [diff] [blame] | 78 | unsigned int max_ratio, max_prop_frac; |
Peter Zijlstra | 189d3c4 | 2008-04-30 00:54:35 -0700 | [diff] [blame] | 79 | |
Jens Axboe | 03ba378 | 2009-09-09 09:08:54 +0200 | [diff] [blame] | 80 | struct bdi_writeback wb; /* default writeback info for this bdi */ |
Christoph Hellwig | c1955ce | 2010-06-19 23:08:06 +0200 | [diff] [blame^] | 81 | spinlock_t wb_lock; /* protects work_list */ |
Miklos Szeredi | 76f1418 | 2008-04-30 00:54:36 -0700 | [diff] [blame] | 82 | |
Jens Axboe | 03ba378 | 2009-09-09 09:08:54 +0200 | [diff] [blame] | 83 | struct list_head work_list; |
| 84 | |
| 85 | struct device *dev; |
Jens Axboe | 66f3b8e | 2009-09-02 09:19:46 +0200 | [diff] [blame] | 86 | |
Matthew Garrett | 31373d0 | 2010-04-06 14:25:14 +0200 | [diff] [blame] | 87 | struct timer_list laptop_mode_wb_timer; |
| 88 | |
Miklos Szeredi | 76f1418 | 2008-04-30 00:54:36 -0700 | [diff] [blame] | 89 | #ifdef CONFIG_DEBUG_FS |
| 90 | struct dentry *debug_dir; |
| 91 | struct dentry *debug_stats; |
| 92 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | }; |
| 94 | |
Peter Zijlstra | b2e8fb6 | 2007-10-16 23:25:47 -0700 | [diff] [blame] | 95 | int bdi_init(struct backing_dev_info *bdi); |
| 96 | void bdi_destroy(struct backing_dev_info *bdi); |
| 97 | |
Peter Zijlstra | cf0ca9f | 2008-04-30 00:54:32 -0700 | [diff] [blame] | 98 | int bdi_register(struct backing_dev_info *bdi, struct device *parent, |
| 99 | const char *fmt, ...); |
| 100 | int bdi_register_dev(struct backing_dev_info *bdi, dev_t dev); |
| 101 | void bdi_unregister(struct backing_dev_info *bdi); |
Jens Axboe | c3c5320 | 2010-04-22 11:37:01 +0200 | [diff] [blame] | 102 | int bdi_setup_and_register(struct backing_dev_info *, char *, unsigned int); |
Christoph Hellwig | c544419 | 2010-06-08 18:15:15 +0200 | [diff] [blame] | 103 | void bdi_start_writeback(struct backing_dev_info *bdi, long nr_pages); |
| 104 | void bdi_start_background_writeback(struct backing_dev_info *bdi); |
Jens Axboe | 03ba378 | 2009-09-09 09:08:54 +0200 | [diff] [blame] | 105 | int bdi_writeback_task(struct bdi_writeback *wb); |
| 106 | int bdi_has_dirty_io(struct backing_dev_info *bdi); |
Jens Axboe | 6423104 | 2010-05-21 20:00:35 +0200 | [diff] [blame] | 107 | void bdi_arm_supers_timer(void); |
Peter Zijlstra | cf0ca9f | 2008-04-30 00:54:32 -0700 | [diff] [blame] | 108 | |
Jens Axboe | 03ba378 | 2009-09-09 09:08:54 +0200 | [diff] [blame] | 109 | extern spinlock_t bdi_lock; |
Jens Axboe | 66f3b8e | 2009-09-02 09:19:46 +0200 | [diff] [blame] | 110 | extern struct list_head bdi_list; |
| 111 | |
Jens Axboe | 03ba378 | 2009-09-09 09:08:54 +0200 | [diff] [blame] | 112 | static inline int wb_has_dirty_io(struct bdi_writeback *wb) |
| 113 | { |
| 114 | return !list_empty(&wb->b_dirty) || |
| 115 | !list_empty(&wb->b_io) || |
| 116 | !list_empty(&wb->b_more_io); |
| 117 | } |
| 118 | |
Peter Zijlstra | b2e8fb6 | 2007-10-16 23:25:47 -0700 | [diff] [blame] | 119 | static inline void __add_bdi_stat(struct backing_dev_info *bdi, |
| 120 | enum bdi_stat_item item, s64 amount) |
Peter Zijlstra | e0bf68d | 2007-10-16 23:25:46 -0700 | [diff] [blame] | 121 | { |
Peter Zijlstra | b2e8fb6 | 2007-10-16 23:25:47 -0700 | [diff] [blame] | 122 | __percpu_counter_add(&bdi->bdi_stat[item], amount, BDI_STAT_BATCH); |
Peter Zijlstra | e0bf68d | 2007-10-16 23:25:46 -0700 | [diff] [blame] | 123 | } |
| 124 | |
Peter Zijlstra | b2e8fb6 | 2007-10-16 23:25:47 -0700 | [diff] [blame] | 125 | static inline void __inc_bdi_stat(struct backing_dev_info *bdi, |
| 126 | enum bdi_stat_item item) |
Peter Zijlstra | e0bf68d | 2007-10-16 23:25:46 -0700 | [diff] [blame] | 127 | { |
Peter Zijlstra | b2e8fb6 | 2007-10-16 23:25:47 -0700 | [diff] [blame] | 128 | __add_bdi_stat(bdi, item, 1); |
| 129 | } |
| 130 | |
| 131 | static inline void inc_bdi_stat(struct backing_dev_info *bdi, |
| 132 | enum bdi_stat_item item) |
| 133 | { |
| 134 | unsigned long flags; |
| 135 | |
| 136 | local_irq_save(flags); |
| 137 | __inc_bdi_stat(bdi, item); |
| 138 | local_irq_restore(flags); |
| 139 | } |
| 140 | |
| 141 | static inline void __dec_bdi_stat(struct backing_dev_info *bdi, |
| 142 | enum bdi_stat_item item) |
| 143 | { |
| 144 | __add_bdi_stat(bdi, item, -1); |
| 145 | } |
| 146 | |
| 147 | static inline void dec_bdi_stat(struct backing_dev_info *bdi, |
| 148 | enum bdi_stat_item item) |
| 149 | { |
| 150 | unsigned long flags; |
| 151 | |
| 152 | local_irq_save(flags); |
| 153 | __dec_bdi_stat(bdi, item); |
| 154 | local_irq_restore(flags); |
| 155 | } |
| 156 | |
| 157 | static inline s64 bdi_stat(struct backing_dev_info *bdi, |
| 158 | enum bdi_stat_item item) |
| 159 | { |
| 160 | return percpu_counter_read_positive(&bdi->bdi_stat[item]); |
| 161 | } |
| 162 | |
| 163 | static inline s64 __bdi_stat_sum(struct backing_dev_info *bdi, |
| 164 | enum bdi_stat_item item) |
| 165 | { |
| 166 | return percpu_counter_sum_positive(&bdi->bdi_stat[item]); |
| 167 | } |
| 168 | |
| 169 | static inline s64 bdi_stat_sum(struct backing_dev_info *bdi, |
| 170 | enum bdi_stat_item item) |
| 171 | { |
| 172 | s64 sum; |
| 173 | unsigned long flags; |
| 174 | |
| 175 | local_irq_save(flags); |
| 176 | sum = __bdi_stat_sum(bdi, item); |
| 177 | local_irq_restore(flags); |
| 178 | |
| 179 | return sum; |
| 180 | } |
| 181 | |
Miklos Szeredi | dd5656e | 2008-04-30 00:54:37 -0700 | [diff] [blame] | 182 | extern void bdi_writeout_inc(struct backing_dev_info *bdi); |
| 183 | |
Peter Zijlstra | b2e8fb6 | 2007-10-16 23:25:47 -0700 | [diff] [blame] | 184 | /* |
| 185 | * maximal error of a stat counter. |
| 186 | */ |
| 187 | static inline unsigned long bdi_stat_error(struct backing_dev_info *bdi) |
| 188 | { |
| 189 | #ifdef CONFIG_SMP |
| 190 | return nr_cpu_ids * BDI_STAT_BATCH; |
| 191 | #else |
| 192 | return 1; |
| 193 | #endif |
Peter Zijlstra | e0bf68d | 2007-10-16 23:25:46 -0700 | [diff] [blame] | 194 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | |
Peter Zijlstra | 189d3c4 | 2008-04-30 00:54:35 -0700 | [diff] [blame] | 196 | int bdi_set_min_ratio(struct backing_dev_info *bdi, unsigned int min_ratio); |
Peter Zijlstra | a42dde0 | 2008-04-30 00:54:36 -0700 | [diff] [blame] | 197 | int bdi_set_max_ratio(struct backing_dev_info *bdi, unsigned int max_ratio); |
Peter Zijlstra | 189d3c4 | 2008-04-30 00:54:35 -0700 | [diff] [blame] | 198 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | /* |
| 200 | * Flags in backing_dev_info::capability |
Miklos Szeredi | e4ad08f | 2008-04-30 00:54:37 -0700 | [diff] [blame] | 201 | * |
| 202 | * The first three flags control whether dirty pages will contribute to the |
| 203 | * VM's accounting and whether writepages() should be called for dirty pages |
| 204 | * (something that would not, for example, be appropriate for ramfs) |
| 205 | * |
| 206 | * WARNING: these flags are closely related and should not normally be |
| 207 | * used separately. The BDI_CAP_NO_ACCT_AND_WRITEBACK combines these |
| 208 | * three flags into a single convenience macro. |
| 209 | * |
| 210 | * BDI_CAP_NO_ACCT_DIRTY: Dirty pages shouldn't contribute to accounting |
| 211 | * BDI_CAP_NO_WRITEBACK: Don't write pages back |
| 212 | * BDI_CAP_NO_ACCT_WB: Don't automatically account writeback pages |
| 213 | * |
| 214 | * These flags let !MMU mmap() govern direct device mapping vs immediate |
| 215 | * copying more easily for MAP_PRIVATE, especially for ROM filesystems. |
| 216 | * |
| 217 | * BDI_CAP_MAP_COPY: Copy can be mapped (MAP_PRIVATE) |
| 218 | * BDI_CAP_MAP_DIRECT: Can be mapped directly (MAP_SHARED) |
| 219 | * BDI_CAP_READ_MAP: Can be mapped for reading |
| 220 | * BDI_CAP_WRITE_MAP: Can be mapped for writing |
| 221 | * BDI_CAP_EXEC_MAP: Can be mapped for execution |
Rik van Riel | 4f98a2f | 2008-10-18 20:26:32 -0700 | [diff] [blame] | 222 | * |
| 223 | * BDI_CAP_SWAP_BACKED: Count shmem/tmpfs objects as swap-backed. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | */ |
Miklos Szeredi | e4ad08f | 2008-04-30 00:54:37 -0700 | [diff] [blame] | 225 | #define BDI_CAP_NO_ACCT_DIRTY 0x00000001 |
| 226 | #define BDI_CAP_NO_WRITEBACK 0x00000002 |
| 227 | #define BDI_CAP_MAP_COPY 0x00000004 |
| 228 | #define BDI_CAP_MAP_DIRECT 0x00000008 |
| 229 | #define BDI_CAP_READ_MAP 0x00000010 |
| 230 | #define BDI_CAP_WRITE_MAP 0x00000020 |
| 231 | #define BDI_CAP_EXEC_MAP 0x00000040 |
| 232 | #define BDI_CAP_NO_ACCT_WB 0x00000080 |
Rik van Riel | 4f98a2f | 2008-10-18 20:26:32 -0700 | [diff] [blame] | 233 | #define BDI_CAP_SWAP_BACKED 0x00000100 |
Miklos Szeredi | e4ad08f | 2008-04-30 00:54:37 -0700 | [diff] [blame] | 234 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | #define BDI_CAP_VMFLAGS \ |
| 236 | (BDI_CAP_READ_MAP | BDI_CAP_WRITE_MAP | BDI_CAP_EXEC_MAP) |
| 237 | |
Miklos Szeredi | e4ad08f | 2008-04-30 00:54:37 -0700 | [diff] [blame] | 238 | #define BDI_CAP_NO_ACCT_AND_WRITEBACK \ |
| 239 | (BDI_CAP_NO_WRITEBACK | BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_ACCT_WB) |
| 240 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | #if defined(VM_MAYREAD) && \ |
| 242 | (BDI_CAP_READ_MAP != VM_MAYREAD || \ |
| 243 | BDI_CAP_WRITE_MAP != VM_MAYWRITE || \ |
| 244 | BDI_CAP_EXEC_MAP != VM_MAYEXEC) |
| 245 | #error please change backing_dev_info::capabilities flags |
| 246 | #endif |
| 247 | |
| 248 | extern struct backing_dev_info default_backing_dev_info; |
Jörn Engel | 5129a46 | 2010-04-25 08:54:42 +0200 | [diff] [blame] | 249 | extern struct backing_dev_info noop_backing_dev_info; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | void default_unplug_io_fn(struct backing_dev_info *bdi, struct page *page); |
| 251 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | int writeback_in_progress(struct backing_dev_info *bdi); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | |
| 254 | static inline int bdi_congested(struct backing_dev_info *bdi, int bdi_bits) |
| 255 | { |
| 256 | if (bdi->congested_fn) |
| 257 | return bdi->congested_fn(bdi->congested_data, bdi_bits); |
| 258 | return (bdi->state & bdi_bits); |
| 259 | } |
| 260 | |
| 261 | static inline int bdi_read_congested(struct backing_dev_info *bdi) |
| 262 | { |
Jens Axboe | 1faa16d | 2009-04-06 14:48:01 +0200 | [diff] [blame] | 263 | return bdi_congested(bdi, 1 << BDI_sync_congested); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | } |
| 265 | |
| 266 | static inline int bdi_write_congested(struct backing_dev_info *bdi) |
| 267 | { |
Jens Axboe | 1faa16d | 2009-04-06 14:48:01 +0200 | [diff] [blame] | 268 | return bdi_congested(bdi, 1 << BDI_async_congested); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | } |
| 270 | |
| 271 | static inline int bdi_rw_congested(struct backing_dev_info *bdi) |
| 272 | { |
Jens Axboe | 1faa16d | 2009-04-06 14:48:01 +0200 | [diff] [blame] | 273 | return bdi_congested(bdi, (1 << BDI_sync_congested) | |
| 274 | (1 << BDI_async_congested)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | } |
| 276 | |
Trond Myklebust | 373c0a7 | 2009-07-11 10:06:54 -0400 | [diff] [blame] | 277 | enum { |
| 278 | BLK_RW_ASYNC = 0, |
| 279 | BLK_RW_SYNC = 1, |
| 280 | }; |
| 281 | |
Jens Axboe | 8aa7e84 | 2009-07-09 14:52:32 +0200 | [diff] [blame] | 282 | void clear_bdi_congested(struct backing_dev_info *bdi, int sync); |
| 283 | void set_bdi_congested(struct backing_dev_info *bdi, int sync); |
| 284 | long congestion_wait(int sync, long timeout); |
Andrew Morton | 3fcfab1 | 2006-10-19 23:28:16 -0700 | [diff] [blame] | 285 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | |
Miklos Szeredi | e4ad08f | 2008-04-30 00:54:37 -0700 | [diff] [blame] | 287 | static inline bool bdi_cap_writeback_dirty(struct backing_dev_info *bdi) |
| 288 | { |
| 289 | return !(bdi->capabilities & BDI_CAP_NO_WRITEBACK); |
| 290 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | |
Miklos Szeredi | e4ad08f | 2008-04-30 00:54:37 -0700 | [diff] [blame] | 292 | static inline bool bdi_cap_account_dirty(struct backing_dev_info *bdi) |
| 293 | { |
| 294 | return !(bdi->capabilities & BDI_CAP_NO_ACCT_DIRTY); |
| 295 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | |
Miklos Szeredi | e4ad08f | 2008-04-30 00:54:37 -0700 | [diff] [blame] | 297 | static inline bool bdi_cap_account_writeback(struct backing_dev_info *bdi) |
| 298 | { |
| 299 | /* Paranoia: BDI_CAP_NO_WRITEBACK implies BDI_CAP_NO_ACCT_WB */ |
| 300 | return !(bdi->capabilities & (BDI_CAP_NO_ACCT_WB | |
| 301 | BDI_CAP_NO_WRITEBACK)); |
| 302 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | |
Rik van Riel | 4f98a2f | 2008-10-18 20:26:32 -0700 | [diff] [blame] | 304 | static inline bool bdi_cap_swap_backed(struct backing_dev_info *bdi) |
| 305 | { |
| 306 | return bdi->capabilities & BDI_CAP_SWAP_BACKED; |
| 307 | } |
| 308 | |
Jens Axboe | 03ba378 | 2009-09-09 09:08:54 +0200 | [diff] [blame] | 309 | static inline bool bdi_cap_flush_forker(struct backing_dev_info *bdi) |
| 310 | { |
| 311 | return bdi == &default_backing_dev_info; |
| 312 | } |
| 313 | |
Miklos Szeredi | e4ad08f | 2008-04-30 00:54:37 -0700 | [diff] [blame] | 314 | static inline bool mapping_cap_writeback_dirty(struct address_space *mapping) |
| 315 | { |
| 316 | return bdi_cap_writeback_dirty(mapping->backing_dev_info); |
| 317 | } |
| 318 | |
| 319 | static inline bool mapping_cap_account_dirty(struct address_space *mapping) |
| 320 | { |
| 321 | return bdi_cap_account_dirty(mapping->backing_dev_info); |
| 322 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | |
Rik van Riel | 4f98a2f | 2008-10-18 20:26:32 -0700 | [diff] [blame] | 324 | static inline bool mapping_cap_swap_backed(struct address_space *mapping) |
| 325 | { |
| 326 | return bdi_cap_swap_backed(mapping->backing_dev_info); |
| 327 | } |
| 328 | |
Jens Axboe | 03ba378 | 2009-09-09 09:08:54 +0200 | [diff] [blame] | 329 | static inline int bdi_sched_wait(void *word) |
| 330 | { |
| 331 | schedule(); |
| 332 | return 0; |
| 333 | } |
| 334 | |
Jens Axboe | b9d128f | 2009-10-29 13:59:26 +0100 | [diff] [blame] | 335 | static inline void blk_run_backing_dev(struct backing_dev_info *bdi, |
| 336 | struct page *page) |
| 337 | { |
| 338 | if (bdi && bdi->unplug_io_fn) |
| 339 | bdi->unplug_io_fn(bdi, page); |
| 340 | } |
| 341 | |
| 342 | static inline void blk_run_address_space(struct address_space *mapping) |
| 343 | { |
| 344 | if (mapping) |
| 345 | blk_run_backing_dev(mapping->backing_dev_info, NULL); |
| 346 | } |
| 347 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | #endif /* _LINUX_BACKING_DEV_H */ |