Commit | Line | Data |
---|---|---|
1da177e4 LT |
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 | ||
cf0ca9fe | 11 | #include <linux/kernel.h> |
e4ad08fe | 12 | #include <linux/fs.h> |
03ba3782 | 13 | #include <linux/sched.h> |
a212b105 | 14 | #include <linux/blkdev.h> |
03ba3782 | 15 | #include <linux/writeback.h> |
52ebea74 | 16 | #include <linux/blk-cgroup.h> |
66114cad | 17 | #include <linux/backing-dev-defs.h> |
a13f35e8 | 18 | #include <linux/slab.h> |
de1414a6 | 19 | |
8077c0d9 | 20 | int __must_check bdi_init(struct backing_dev_info *bdi); |
b02176f3 | 21 | void bdi_exit(struct backing_dev_info *bdi); |
b2e8fb6e | 22 | |
d2cc4dde | 23 | __printf(3, 4) |
cf0ca9fe PZ |
24 | int bdi_register(struct backing_dev_info *bdi, struct device *parent, |
25 | const char *fmt, ...); | |
26 | int bdi_register_dev(struct backing_dev_info *bdi, dev_t dev); | |
df08c32c | 27 | int bdi_register_owner(struct backing_dev_info *bdi, struct device *owner); |
b02176f3 TH |
28 | void bdi_unregister(struct backing_dev_info *bdi); |
29 | ||
b4caecd4 | 30 | int __must_check bdi_setup_and_register(struct backing_dev_info *, char *); |
b02176f3 TH |
31 | void bdi_destroy(struct backing_dev_info *bdi); |
32 | ||
c00ddad3 TH |
33 | void wb_start_writeback(struct bdi_writeback *wb, long nr_pages, |
34 | bool range_cyclic, enum wb_reason reason); | |
9ecf4866 | 35 | void wb_start_background_writeback(struct bdi_writeback *wb); |
f0054bb1 | 36 | void wb_workfn(struct work_struct *work); |
f0054bb1 | 37 | void wb_wakeup_delayed(struct bdi_writeback *wb); |
cf0ca9fe | 38 | |
03ba3782 | 39 | extern spinlock_t bdi_lock; |
66f3b8e2 JA |
40 | extern struct list_head bdi_list; |
41 | ||
839a8e86 TH |
42 | extern struct workqueue_struct *bdi_wq; |
43 | ||
d6c10f1f | 44 | static inline bool wb_has_dirty_io(struct bdi_writeback *wb) |
03ba3782 | 45 | { |
d6c10f1f | 46 | return test_bit(WB_has_dirty_io, &wb->state); |
03ba3782 JA |
47 | } |
48 | ||
95a46c65 TH |
49 | static inline bool bdi_has_dirty_io(struct backing_dev_info *bdi) |
50 | { | |
51 | /* | |
52 | * @bdi->tot_write_bandwidth is guaranteed to be > 0 if there are | |
53 | * any dirty wbs. See wb_update_write_bandwidth(). | |
54 | */ | |
55 | return atomic_long_read(&bdi->tot_write_bandwidth); | |
03ba3782 JA |
56 | } |
57 | ||
93f78d88 TH |
58 | static inline void __add_wb_stat(struct bdi_writeback *wb, |
59 | enum wb_stat_item item, s64 amount) | |
b2e8fb6e | 60 | { |
93f78d88 | 61 | __percpu_counter_add(&wb->stat[item], amount, WB_STAT_BATCH); |
b2e8fb6e PZ |
62 | } |
63 | ||
93f78d88 TH |
64 | static inline void __inc_wb_stat(struct bdi_writeback *wb, |
65 | enum wb_stat_item item) | |
b2e8fb6e | 66 | { |
93f78d88 | 67 | __add_wb_stat(wb, item, 1); |
b2e8fb6e PZ |
68 | } |
69 | ||
93f78d88 | 70 | static inline void inc_wb_stat(struct bdi_writeback *wb, enum wb_stat_item item) |
b2e8fb6e PZ |
71 | { |
72 | unsigned long flags; | |
73 | ||
74 | local_irq_save(flags); | |
93f78d88 | 75 | __inc_wb_stat(wb, item); |
b2e8fb6e PZ |
76 | local_irq_restore(flags); |
77 | } | |
78 | ||
93f78d88 TH |
79 | static inline void __dec_wb_stat(struct bdi_writeback *wb, |
80 | enum wb_stat_item item) | |
b2e8fb6e | 81 | { |
93f78d88 | 82 | __add_wb_stat(wb, item, -1); |
b2e8fb6e PZ |
83 | } |
84 | ||
93f78d88 | 85 | static inline void dec_wb_stat(struct bdi_writeback *wb, enum wb_stat_item item) |
b2e8fb6e PZ |
86 | { |
87 | unsigned long flags; | |
88 | ||
89 | local_irq_save(flags); | |
93f78d88 | 90 | __dec_wb_stat(wb, item); |
b2e8fb6e PZ |
91 | local_irq_restore(flags); |
92 | } | |
93 | ||
93f78d88 | 94 | static inline s64 wb_stat(struct bdi_writeback *wb, enum wb_stat_item item) |
b2e8fb6e | 95 | { |
93f78d88 | 96 | return percpu_counter_read_positive(&wb->stat[item]); |
b2e8fb6e PZ |
97 | } |
98 | ||
93f78d88 TH |
99 | static inline s64 __wb_stat_sum(struct bdi_writeback *wb, |
100 | enum wb_stat_item item) | |
b2e8fb6e | 101 | { |
93f78d88 | 102 | return percpu_counter_sum_positive(&wb->stat[item]); |
b2e8fb6e PZ |
103 | } |
104 | ||
93f78d88 | 105 | static inline s64 wb_stat_sum(struct bdi_writeback *wb, enum wb_stat_item item) |
e0bf68dd | 106 | { |
b2e8fb6e PZ |
107 | s64 sum; |
108 | unsigned long flags; | |
109 | ||
110 | local_irq_save(flags); | |
93f78d88 | 111 | sum = __wb_stat_sum(wb, item); |
b2e8fb6e PZ |
112 | local_irq_restore(flags); |
113 | ||
114 | return sum; | |
e0bf68dd PZ |
115 | } |
116 | ||
93f78d88 | 117 | extern void wb_writeout_inc(struct bdi_writeback *wb); |
dd5656e5 | 118 | |
b2e8fb6e PZ |
119 | /* |
120 | * maximal error of a stat counter. | |
121 | */ | |
93f78d88 | 122 | static inline unsigned long wb_stat_error(struct bdi_writeback *wb) |
e0bf68dd | 123 | { |
b2e8fb6e | 124 | #ifdef CONFIG_SMP |
93f78d88 | 125 | return nr_cpu_ids * WB_STAT_BATCH; |
b2e8fb6e PZ |
126 | #else |
127 | return 1; | |
128 | #endif | |
e0bf68dd | 129 | } |
1da177e4 | 130 | |
189d3c4a | 131 | int bdi_set_min_ratio(struct backing_dev_info *bdi, unsigned int min_ratio); |
a42dde04 | 132 | int bdi_set_max_ratio(struct backing_dev_info *bdi, unsigned int max_ratio); |
189d3c4a | 133 | |
1da177e4 LT |
134 | /* |
135 | * Flags in backing_dev_info::capability | |
e4ad08fe MS |
136 | * |
137 | * The first three flags control whether dirty pages will contribute to the | |
138 | * VM's accounting and whether writepages() should be called for dirty pages | |
139 | * (something that would not, for example, be appropriate for ramfs) | |
140 | * | |
141 | * WARNING: these flags are closely related and should not normally be | |
142 | * used separately. The BDI_CAP_NO_ACCT_AND_WRITEBACK combines these | |
143 | * three flags into a single convenience macro. | |
144 | * | |
145 | * BDI_CAP_NO_ACCT_DIRTY: Dirty pages shouldn't contribute to accounting | |
146 | * BDI_CAP_NO_WRITEBACK: Don't write pages back | |
147 | * BDI_CAP_NO_ACCT_WB: Don't automatically account writeback pages | |
5a537485 | 148 | * BDI_CAP_STRICTLIMIT: Keep number of dirty pages below bdi threshold. |
89e9b9e0 TH |
149 | * |
150 | * BDI_CAP_CGROUP_WRITEBACK: Supports cgroup-aware writeback. | |
1da177e4 | 151 | */ |
e4ad08fe MS |
152 | #define BDI_CAP_NO_ACCT_DIRTY 0x00000001 |
153 | #define BDI_CAP_NO_WRITEBACK 0x00000002 | |
b4caecd4 CH |
154 | #define BDI_CAP_NO_ACCT_WB 0x00000004 |
155 | #define BDI_CAP_STABLE_WRITES 0x00000008 | |
156 | #define BDI_CAP_STRICTLIMIT 0x00000010 | |
89e9b9e0 | 157 | #define BDI_CAP_CGROUP_WRITEBACK 0x00000020 |
1da177e4 | 158 | |
e4ad08fe MS |
159 | #define BDI_CAP_NO_ACCT_AND_WRITEBACK \ |
160 | (BDI_CAP_NO_WRITEBACK | BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_ACCT_WB) | |
161 | ||
5129a469 | 162 | extern struct backing_dev_info noop_backing_dev_info; |
1da177e4 | 163 | |
bc05873d TH |
164 | /** |
165 | * writeback_in_progress - determine whether there is writeback in progress | |
166 | * @wb: bdi_writeback of interest | |
167 | * | |
168 | * Determine whether there is writeback waiting to be handled against a | |
169 | * bdi_writeback. | |
170 | */ | |
171 | static inline bool writeback_in_progress(struct bdi_writeback *wb) | |
1da177e4 | 172 | { |
bc05873d | 173 | return test_bit(WB_writeback_running, &wb->state); |
1da177e4 LT |
174 | } |
175 | ||
a212b105 | 176 | static inline struct backing_dev_info *inode_to_bdi(struct inode *inode) |
1da177e4 | 177 | { |
a212b105 | 178 | struct super_block *sb; |
1da177e4 | 179 | |
a212b105 TH |
180 | if (!inode) |
181 | return &noop_backing_dev_info; | |
182 | ||
183 | sb = inode->i_sb; | |
184 | #ifdef CONFIG_BLOCK | |
185 | if (sb_is_blkdev_sb(sb)) | |
186 | return blk_get_backing_dev_info(I_BDEV(inode)); | |
187 | #endif | |
188 | return sb->s_bdi; | |
1da177e4 LT |
189 | } |
190 | ||
ec8a6f26 | 191 | static inline int wb_congested(struct bdi_writeback *wb, int cong_bits) |
1da177e4 | 192 | { |
ec8a6f26 | 193 | struct backing_dev_info *bdi = wb->bdi; |
1da177e4 | 194 | |
ec8a6f26 TH |
195 | if (bdi->congested_fn) |
196 | return bdi->congested_fn(bdi->congested_data, cong_bits); | |
197 | return wb->congested->state & cong_bits; | |
1da177e4 | 198 | } |
373c0a7e | 199 | |
8aa7e847 | 200 | long congestion_wait(int sync, long timeout); |
599d0c95 | 201 | long wait_iff_congested(struct pglist_data *pgdat, int sync, long timeout); |
3965c9ae WL |
202 | int pdflush_proc_obsolete(struct ctl_table *table, int write, |
203 | void __user *buffer, size_t *lenp, loff_t *ppos); | |
1da177e4 | 204 | |
7d311cda DW |
205 | static inline bool bdi_cap_stable_pages_required(struct backing_dev_info *bdi) |
206 | { | |
207 | return bdi->capabilities & BDI_CAP_STABLE_WRITES; | |
208 | } | |
209 | ||
e4ad08fe MS |
210 | static inline bool bdi_cap_writeback_dirty(struct backing_dev_info *bdi) |
211 | { | |
212 | return !(bdi->capabilities & BDI_CAP_NO_WRITEBACK); | |
213 | } | |
214 | ||
215 | static inline bool bdi_cap_account_dirty(struct backing_dev_info *bdi) | |
216 | { | |
217 | return !(bdi->capabilities & BDI_CAP_NO_ACCT_DIRTY); | |
218 | } | |
1da177e4 | 219 | |
e4ad08fe MS |
220 | static inline bool bdi_cap_account_writeback(struct backing_dev_info *bdi) |
221 | { | |
222 | /* Paranoia: BDI_CAP_NO_WRITEBACK implies BDI_CAP_NO_ACCT_WB */ | |
223 | return !(bdi->capabilities & (BDI_CAP_NO_ACCT_WB | | |
224 | BDI_CAP_NO_WRITEBACK)); | |
225 | } | |
1da177e4 | 226 | |
e4ad08fe MS |
227 | static inline bool mapping_cap_writeback_dirty(struct address_space *mapping) |
228 | { | |
de1414a6 | 229 | return bdi_cap_writeback_dirty(inode_to_bdi(mapping->host)); |
e4ad08fe | 230 | } |
1da177e4 | 231 | |
e4ad08fe MS |
232 | static inline bool mapping_cap_account_dirty(struct address_space *mapping) |
233 | { | |
de1414a6 | 234 | return bdi_cap_account_dirty(inode_to_bdi(mapping->host)); |
e4ad08fe | 235 | } |
1da177e4 | 236 | |
03ba3782 JA |
237 | static inline int bdi_sched_wait(void *word) |
238 | { | |
239 | schedule(); | |
240 | return 0; | |
241 | } | |
242 | ||
89e9b9e0 TH |
243 | #ifdef CONFIG_CGROUP_WRITEBACK |
244 | ||
52ebea74 TH |
245 | struct bdi_writeback_congested * |
246 | wb_congested_get_create(struct backing_dev_info *bdi, int blkcg_id, gfp_t gfp); | |
247 | void wb_congested_put(struct bdi_writeback_congested *congested); | |
248 | struct bdi_writeback *wb_get_create(struct backing_dev_info *bdi, | |
249 | struct cgroup_subsys_state *memcg_css, | |
250 | gfp_t gfp); | |
52ebea74 TH |
251 | void wb_memcg_offline(struct mem_cgroup *memcg); |
252 | void wb_blkcg_offline(struct blkcg *blkcg); | |
703c2708 | 253 | int inode_congested(struct inode *inode, int cong_bits); |
52ebea74 | 254 | |
89e9b9e0 TH |
255 | /** |
256 | * inode_cgwb_enabled - test whether cgroup writeback is enabled on an inode | |
257 | * @inode: inode of interest | |
258 | * | |
259 | * cgroup writeback requires support from both the bdi and filesystem. | |
9badce00 TH |
260 | * Also, both memcg and iocg have to be on the default hierarchy. Test |
261 | * whether all conditions are met. | |
262 | * | |
263 | * Note that the test result may change dynamically on the same inode | |
264 | * depending on how memcg and iocg are configured. | |
89e9b9e0 TH |
265 | */ |
266 | static inline bool inode_cgwb_enabled(struct inode *inode) | |
267 | { | |
268 | struct backing_dev_info *bdi = inode_to_bdi(inode); | |
269 | ||
c0522908 TH |
270 | return cgroup_subsys_on_dfl(memory_cgrp_subsys) && |
271 | cgroup_subsys_on_dfl(io_cgrp_subsys) && | |
9badce00 | 272 | bdi_cap_account_dirty(bdi) && |
89e9b9e0 | 273 | (bdi->capabilities & BDI_CAP_CGROUP_WRITEBACK) && |
46b15caa | 274 | (inode->i_sb->s_iflags & SB_I_CGROUPWB); |
89e9b9e0 TH |
275 | } |
276 | ||
52ebea74 TH |
277 | /** |
278 | * wb_find_current - find wb for %current on a bdi | |
279 | * @bdi: bdi of interest | |
280 | * | |
281 | * Find the wb of @bdi which matches both the memcg and blkcg of %current. | |
282 | * Must be called under rcu_read_lock() which protects the returend wb. | |
283 | * NULL if not found. | |
284 | */ | |
285 | static inline struct bdi_writeback *wb_find_current(struct backing_dev_info *bdi) | |
286 | { | |
287 | struct cgroup_subsys_state *memcg_css; | |
288 | struct bdi_writeback *wb; | |
289 | ||
290 | memcg_css = task_css(current, memory_cgrp_id); | |
291 | if (!memcg_css->parent) | |
292 | return &bdi->wb; | |
293 | ||
294 | wb = radix_tree_lookup(&bdi->cgwb_tree, memcg_css->id); | |
295 | ||
296 | /* | |
297 | * %current's blkcg equals the effective blkcg of its memcg. No | |
298 | * need to use the relatively expensive cgroup_get_e_css(). | |
299 | */ | |
c165b3e3 | 300 | if (likely(wb && wb->blkcg_css == task_css(current, io_cgrp_id))) |
52ebea74 TH |
301 | return wb; |
302 | return NULL; | |
303 | } | |
304 | ||
305 | /** | |
306 | * wb_get_create_current - get or create wb for %current on a bdi | |
307 | * @bdi: bdi of interest | |
308 | * @gfp: allocation mask | |
309 | * | |
310 | * Equivalent to wb_get_create() on %current's memcg. This function is | |
311 | * called from a relatively hot path and optimizes the common cases using | |
312 | * wb_find_current(). | |
313 | */ | |
314 | static inline struct bdi_writeback * | |
315 | wb_get_create_current(struct backing_dev_info *bdi, gfp_t gfp) | |
316 | { | |
317 | struct bdi_writeback *wb; | |
318 | ||
319 | rcu_read_lock(); | |
320 | wb = wb_find_current(bdi); | |
321 | if (wb && unlikely(!wb_tryget(wb))) | |
322 | wb = NULL; | |
323 | rcu_read_unlock(); | |
324 | ||
325 | if (unlikely(!wb)) { | |
326 | struct cgroup_subsys_state *memcg_css; | |
327 | ||
328 | memcg_css = task_get_css(current, memory_cgrp_id); | |
329 | wb = wb_get_create(bdi, memcg_css, gfp); | |
330 | css_put(memcg_css); | |
331 | } | |
332 | return wb; | |
333 | } | |
334 | ||
aaa2cacf TH |
335 | /** |
336 | * inode_to_wb_is_valid - test whether an inode has a wb associated | |
337 | * @inode: inode of interest | |
338 | * | |
339 | * Returns %true if @inode has a wb associated. May be called without any | |
340 | * locking. | |
341 | */ | |
342 | static inline bool inode_to_wb_is_valid(struct inode *inode) | |
343 | { | |
344 | return inode->i_wb; | |
345 | } | |
346 | ||
52ebea74 TH |
347 | /** |
348 | * inode_to_wb - determine the wb of an inode | |
349 | * @inode: inode of interest | |
350 | * | |
aaa2cacf TH |
351 | * Returns the wb @inode is currently associated with. The caller must be |
352 | * holding either @inode->i_lock, @inode->i_mapping->tree_lock, or the | |
353 | * associated wb's list_lock. | |
52ebea74 TH |
354 | */ |
355 | static inline struct bdi_writeback *inode_to_wb(struct inode *inode) | |
356 | { | |
aaa2cacf TH |
357 | #ifdef CONFIG_LOCKDEP |
358 | WARN_ON_ONCE(debug_locks && | |
359 | (!lockdep_is_held(&inode->i_lock) && | |
360 | !lockdep_is_held(&inode->i_mapping->tree_lock) && | |
361 | !lockdep_is_held(&inode->i_wb->list_lock))); | |
362 | #endif | |
52ebea74 TH |
363 | return inode->i_wb; |
364 | } | |
365 | ||
682aa8e1 TH |
366 | /** |
367 | * unlocked_inode_to_wb_begin - begin unlocked inode wb access transaction | |
368 | * @inode: target inode | |
369 | * @lockedp: temp bool output param, to be passed to the end function | |
370 | * | |
371 | * The caller wants to access the wb associated with @inode but isn't | |
372 | * holding inode->i_lock, mapping->tree_lock or wb->list_lock. This | |
373 | * function determines the wb associated with @inode and ensures that the | |
374 | * association doesn't change until the transaction is finished with | |
375 | * unlocked_inode_to_wb_end(). | |
376 | * | |
377 | * The caller must call unlocked_inode_to_wb_end() with *@lockdep | |
378 | * afterwards and can't sleep during transaction. IRQ may or may not be | |
379 | * disabled on return. | |
380 | */ | |
381 | static inline struct bdi_writeback * | |
382 | unlocked_inode_to_wb_begin(struct inode *inode, bool *lockedp) | |
383 | { | |
384 | rcu_read_lock(); | |
385 | ||
386 | /* | |
387 | * Paired with store_release in inode_switch_wb_work_fn() and | |
388 | * ensures that we see the new wb if we see cleared I_WB_SWITCH. | |
389 | */ | |
390 | *lockedp = smp_load_acquire(&inode->i_state) & I_WB_SWITCH; | |
391 | ||
392 | if (unlikely(*lockedp)) | |
393 | spin_lock_irq(&inode->i_mapping->tree_lock); | |
aaa2cacf TH |
394 | |
395 | /* | |
396 | * Protected by either !I_WB_SWITCH + rcu_read_lock() or tree_lock. | |
397 | * inode_to_wb() will bark. Deref directly. | |
398 | */ | |
399 | return inode->i_wb; | |
682aa8e1 TH |
400 | } |
401 | ||
402 | /** | |
403 | * unlocked_inode_to_wb_end - end inode wb access transaction | |
404 | * @inode: target inode | |
405 | * @locked: *@lockedp from unlocked_inode_to_wb_begin() | |
406 | */ | |
407 | static inline void unlocked_inode_to_wb_end(struct inode *inode, bool locked) | |
408 | { | |
409 | if (unlikely(locked)) | |
410 | spin_unlock_irq(&inode->i_mapping->tree_lock); | |
411 | ||
412 | rcu_read_unlock(); | |
413 | } | |
414 | ||
89e9b9e0 TH |
415 | #else /* CONFIG_CGROUP_WRITEBACK */ |
416 | ||
417 | static inline bool inode_cgwb_enabled(struct inode *inode) | |
418 | { | |
419 | return false; | |
420 | } | |
421 | ||
52ebea74 TH |
422 | static inline struct bdi_writeback_congested * |
423 | wb_congested_get_create(struct backing_dev_info *bdi, int blkcg_id, gfp_t gfp) | |
424 | { | |
a13f35e8 TH |
425 | atomic_inc(&bdi->wb_congested->refcnt); |
426 | return bdi->wb_congested; | |
52ebea74 TH |
427 | } |
428 | ||
429 | static inline void wb_congested_put(struct bdi_writeback_congested *congested) | |
430 | { | |
a13f35e8 TH |
431 | if (atomic_dec_and_test(&congested->refcnt)) |
432 | kfree(congested); | |
52ebea74 TH |
433 | } |
434 | ||
52ebea74 TH |
435 | static inline struct bdi_writeback *wb_find_current(struct backing_dev_info *bdi) |
436 | { | |
437 | return &bdi->wb; | |
438 | } | |
439 | ||
440 | static inline struct bdi_writeback * | |
441 | wb_get_create_current(struct backing_dev_info *bdi, gfp_t gfp) | |
442 | { | |
443 | return &bdi->wb; | |
444 | } | |
445 | ||
aaa2cacf TH |
446 | static inline bool inode_to_wb_is_valid(struct inode *inode) |
447 | { | |
448 | return true; | |
449 | } | |
450 | ||
52ebea74 TH |
451 | static inline struct bdi_writeback *inode_to_wb(struct inode *inode) |
452 | { | |
453 | return &inode_to_bdi(inode)->wb; | |
454 | } | |
455 | ||
682aa8e1 TH |
456 | static inline struct bdi_writeback * |
457 | unlocked_inode_to_wb_begin(struct inode *inode, bool *lockedp) | |
458 | { | |
459 | return inode_to_wb(inode); | |
460 | } | |
461 | ||
462 | static inline void unlocked_inode_to_wb_end(struct inode *inode, bool locked) | |
463 | { | |
464 | } | |
465 | ||
52ebea74 TH |
466 | static inline void wb_memcg_offline(struct mem_cgroup *memcg) |
467 | { | |
468 | } | |
469 | ||
470 | static inline void wb_blkcg_offline(struct blkcg *blkcg) | |
471 | { | |
472 | } | |
473 | ||
703c2708 TH |
474 | static inline int inode_congested(struct inode *inode, int cong_bits) |
475 | { | |
476 | return wb_congested(&inode_to_bdi(inode)->wb, cong_bits); | |
477 | } | |
478 | ||
89e9b9e0 TH |
479 | #endif /* CONFIG_CGROUP_WRITEBACK */ |
480 | ||
703c2708 TH |
481 | static inline int inode_read_congested(struct inode *inode) |
482 | { | |
483 | return inode_congested(inode, 1 << WB_sync_congested); | |
484 | } | |
485 | ||
486 | static inline int inode_write_congested(struct inode *inode) | |
487 | { | |
488 | return inode_congested(inode, 1 << WB_async_congested); | |
489 | } | |
490 | ||
491 | static inline int inode_rw_congested(struct inode *inode) | |
492 | { | |
493 | return inode_congested(inode, (1 << WB_sync_congested) | | |
494 | (1 << WB_async_congested)); | |
495 | } | |
496 | ||
ec8a6f26 TH |
497 | static inline int bdi_congested(struct backing_dev_info *bdi, int cong_bits) |
498 | { | |
499 | return wb_congested(&bdi->wb, cong_bits); | |
500 | } | |
501 | ||
502 | static inline int bdi_read_congested(struct backing_dev_info *bdi) | |
503 | { | |
504 | return bdi_congested(bdi, 1 << WB_sync_congested); | |
505 | } | |
506 | ||
507 | static inline int bdi_write_congested(struct backing_dev_info *bdi) | |
508 | { | |
509 | return bdi_congested(bdi, 1 << WB_async_congested); | |
510 | } | |
511 | ||
512 | static inline int bdi_rw_congested(struct backing_dev_info *bdi) | |
513 | { | |
514 | return bdi_congested(bdi, (1 << WB_sync_congested) | | |
515 | (1 << WB_async_congested)); | |
516 | } | |
517 | ||
89e9b9e0 | 518 | #endif /* _LINUX_BACKING_DEV_H */ |