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Commit | Line | Data |
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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 | |
d03f6cdc JK |
20 | static inline struct backing_dev_info *bdi_get(struct backing_dev_info *bdi) |
21 | { | |
22 | kref_get(&bdi->refcnt); | |
23 | return bdi; | |
24 | } | |
25 | ||
26 | void bdi_put(struct backing_dev_info *bdi); | |
b2e8fb6e | 27 | |
d2cc4dde | 28 | __printf(3, 4) |
cf0ca9fe PZ |
29 | int bdi_register(struct backing_dev_info *bdi, struct device *parent, |
30 | const char *fmt, ...); | |
baf7a616 JK |
31 | int bdi_register_va(struct backing_dev_info *bdi, struct device *parent, |
32 | const char *fmt, va_list args); | |
df08c32c | 33 | int bdi_register_owner(struct backing_dev_info *bdi, struct device *owner); |
b02176f3 TH |
34 | void bdi_unregister(struct backing_dev_info *bdi); |
35 | ||
d03f6cdc | 36 | struct backing_dev_info *bdi_alloc_node(gfp_t gfp_mask, int node_id); |
baf7a616 JK |
37 | static inline struct backing_dev_info *bdi_alloc(gfp_t gfp_mask) |
38 | { | |
39 | return bdi_alloc_node(gfp_mask, NUMA_NO_NODE); | |
40 | } | |
b02176f3 | 41 | |
c00ddad3 TH |
42 | void wb_start_writeback(struct bdi_writeback *wb, long nr_pages, |
43 | bool range_cyclic, enum wb_reason reason); | |
9ecf4866 | 44 | void wb_start_background_writeback(struct bdi_writeback *wb); |
f0054bb1 | 45 | void wb_workfn(struct work_struct *work); |
f0054bb1 | 46 | void wb_wakeup_delayed(struct bdi_writeback *wb); |
cf0ca9fe | 47 | |
03ba3782 | 48 | extern spinlock_t bdi_lock; |
66f3b8e2 JA |
49 | extern struct list_head bdi_list; |
50 | ||
839a8e86 TH |
51 | extern struct workqueue_struct *bdi_wq; |
52 | ||
d6c10f1f | 53 | static inline bool wb_has_dirty_io(struct bdi_writeback *wb) |
03ba3782 | 54 | { |
d6c10f1f | 55 | return test_bit(WB_has_dirty_io, &wb->state); |
03ba3782 JA |
56 | } |
57 | ||
95a46c65 TH |
58 | static inline bool bdi_has_dirty_io(struct backing_dev_info *bdi) |
59 | { | |
60 | /* | |
61 | * @bdi->tot_write_bandwidth is guaranteed to be > 0 if there are | |
62 | * any dirty wbs. See wb_update_write_bandwidth(). | |
63 | */ | |
64 | return atomic_long_read(&bdi->tot_write_bandwidth); | |
03ba3782 JA |
65 | } |
66 | ||
93f78d88 TH |
67 | static inline void __add_wb_stat(struct bdi_writeback *wb, |
68 | enum wb_stat_item item, s64 amount) | |
b2e8fb6e | 69 | { |
93f78d88 | 70 | __percpu_counter_add(&wb->stat[item], amount, WB_STAT_BATCH); |
b2e8fb6e PZ |
71 | } |
72 | ||
93f78d88 TH |
73 | static inline void __inc_wb_stat(struct bdi_writeback *wb, |
74 | enum wb_stat_item item) | |
b2e8fb6e | 75 | { |
93f78d88 | 76 | __add_wb_stat(wb, item, 1); |
b2e8fb6e PZ |
77 | } |
78 | ||
93f78d88 | 79 | static inline void inc_wb_stat(struct bdi_writeback *wb, enum wb_stat_item item) |
b2e8fb6e PZ |
80 | { |
81 | unsigned long flags; | |
82 | ||
83 | local_irq_save(flags); | |
93f78d88 | 84 | __inc_wb_stat(wb, item); |
b2e8fb6e PZ |
85 | local_irq_restore(flags); |
86 | } | |
87 | ||
93f78d88 TH |
88 | static inline void __dec_wb_stat(struct bdi_writeback *wb, |
89 | enum wb_stat_item item) | |
b2e8fb6e | 90 | { |
93f78d88 | 91 | __add_wb_stat(wb, item, -1); |
b2e8fb6e PZ |
92 | } |
93 | ||
93f78d88 | 94 | static inline void dec_wb_stat(struct bdi_writeback *wb, enum wb_stat_item item) |
b2e8fb6e PZ |
95 | { |
96 | unsigned long flags; | |
97 | ||
98 | local_irq_save(flags); | |
93f78d88 | 99 | __dec_wb_stat(wb, item); |
b2e8fb6e PZ |
100 | local_irq_restore(flags); |
101 | } | |
102 | ||
93f78d88 | 103 | static inline s64 wb_stat(struct bdi_writeback *wb, enum wb_stat_item item) |
b2e8fb6e | 104 | { |
93f78d88 | 105 | return percpu_counter_read_positive(&wb->stat[item]); |
b2e8fb6e PZ |
106 | } |
107 | ||
93f78d88 TH |
108 | static inline s64 __wb_stat_sum(struct bdi_writeback *wb, |
109 | enum wb_stat_item item) | |
b2e8fb6e | 110 | { |
93f78d88 | 111 | return percpu_counter_sum_positive(&wb->stat[item]); |
b2e8fb6e PZ |
112 | } |
113 | ||
93f78d88 | 114 | static inline s64 wb_stat_sum(struct bdi_writeback *wb, enum wb_stat_item item) |
e0bf68dd | 115 | { |
b2e8fb6e PZ |
116 | s64 sum; |
117 | unsigned long flags; | |
118 | ||
119 | local_irq_save(flags); | |
93f78d88 | 120 | sum = __wb_stat_sum(wb, item); |
b2e8fb6e PZ |
121 | local_irq_restore(flags); |
122 | ||
123 | return sum; | |
e0bf68dd PZ |
124 | } |
125 | ||
93f78d88 | 126 | extern void wb_writeout_inc(struct bdi_writeback *wb); |
dd5656e5 | 127 | |
b2e8fb6e PZ |
128 | /* |
129 | * maximal error of a stat counter. | |
130 | */ | |
93f78d88 | 131 | static inline unsigned long wb_stat_error(struct bdi_writeback *wb) |
e0bf68dd | 132 | { |
b2e8fb6e | 133 | #ifdef CONFIG_SMP |
93f78d88 | 134 | return nr_cpu_ids * WB_STAT_BATCH; |
b2e8fb6e PZ |
135 | #else |
136 | return 1; | |
137 | #endif | |
e0bf68dd | 138 | } |
1da177e4 | 139 | |
189d3c4a | 140 | int bdi_set_min_ratio(struct backing_dev_info *bdi, unsigned int min_ratio); |
a42dde04 | 141 | int bdi_set_max_ratio(struct backing_dev_info *bdi, unsigned int max_ratio); |
189d3c4a | 142 | |
1da177e4 LT |
143 | /* |
144 | * Flags in backing_dev_info::capability | |
e4ad08fe MS |
145 | * |
146 | * The first three flags control whether dirty pages will contribute to the | |
147 | * VM's accounting and whether writepages() should be called for dirty pages | |
148 | * (something that would not, for example, be appropriate for ramfs) | |
149 | * | |
150 | * WARNING: these flags are closely related and should not normally be | |
151 | * used separately. The BDI_CAP_NO_ACCT_AND_WRITEBACK combines these | |
152 | * three flags into a single convenience macro. | |
153 | * | |
154 | * BDI_CAP_NO_ACCT_DIRTY: Dirty pages shouldn't contribute to accounting | |
155 | * BDI_CAP_NO_WRITEBACK: Don't write pages back | |
156 | * BDI_CAP_NO_ACCT_WB: Don't automatically account writeback pages | |
5a537485 | 157 | * BDI_CAP_STRICTLIMIT: Keep number of dirty pages below bdi threshold. |
89e9b9e0 TH |
158 | * |
159 | * BDI_CAP_CGROUP_WRITEBACK: Supports cgroup-aware writeback. | |
1da177e4 | 160 | */ |
e4ad08fe MS |
161 | #define BDI_CAP_NO_ACCT_DIRTY 0x00000001 |
162 | #define BDI_CAP_NO_WRITEBACK 0x00000002 | |
b4caecd4 CH |
163 | #define BDI_CAP_NO_ACCT_WB 0x00000004 |
164 | #define BDI_CAP_STABLE_WRITES 0x00000008 | |
165 | #define BDI_CAP_STRICTLIMIT 0x00000010 | |
89e9b9e0 | 166 | #define BDI_CAP_CGROUP_WRITEBACK 0x00000020 |
1da177e4 | 167 | |
e4ad08fe MS |
168 | #define BDI_CAP_NO_ACCT_AND_WRITEBACK \ |
169 | (BDI_CAP_NO_WRITEBACK | BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_ACCT_WB) | |
170 | ||
5129a469 | 171 | extern struct backing_dev_info noop_backing_dev_info; |
1da177e4 | 172 | |
bc05873d TH |
173 | /** |
174 | * writeback_in_progress - determine whether there is writeback in progress | |
175 | * @wb: bdi_writeback of interest | |
176 | * | |
177 | * Determine whether there is writeback waiting to be handled against a | |
178 | * bdi_writeback. | |
179 | */ | |
180 | static inline bool writeback_in_progress(struct bdi_writeback *wb) | |
1da177e4 | 181 | { |
bc05873d | 182 | return test_bit(WB_writeback_running, &wb->state); |
1da177e4 LT |
183 | } |
184 | ||
a212b105 | 185 | static inline struct backing_dev_info *inode_to_bdi(struct inode *inode) |
1da177e4 | 186 | { |
a212b105 | 187 | struct super_block *sb; |
1da177e4 | 188 | |
a212b105 TH |
189 | if (!inode) |
190 | return &noop_backing_dev_info; | |
191 | ||
192 | sb = inode->i_sb; | |
193 | #ifdef CONFIG_BLOCK | |
194 | if (sb_is_blkdev_sb(sb)) | |
efa7c9f9 | 195 | return I_BDEV(inode)->bd_bdi; |
a212b105 TH |
196 | #endif |
197 | return sb->s_bdi; | |
1da177e4 LT |
198 | } |
199 | ||
ec8a6f26 | 200 | static inline int wb_congested(struct bdi_writeback *wb, int cong_bits) |
1da177e4 | 201 | { |
ec8a6f26 | 202 | struct backing_dev_info *bdi = wb->bdi; |
1da177e4 | 203 | |
ec8a6f26 TH |
204 | if (bdi->congested_fn) |
205 | return bdi->congested_fn(bdi->congested_data, cong_bits); | |
206 | return wb->congested->state & cong_bits; | |
1da177e4 | 207 | } |
373c0a7e | 208 | |
8aa7e847 | 209 | long congestion_wait(int sync, long timeout); |
599d0c95 | 210 | long wait_iff_congested(struct pglist_data *pgdat, int sync, long timeout); |
3965c9ae WL |
211 | int pdflush_proc_obsolete(struct ctl_table *table, int write, |
212 | void __user *buffer, size_t *lenp, loff_t *ppos); | |
1da177e4 | 213 | |
7d311cda DW |
214 | static inline bool bdi_cap_stable_pages_required(struct backing_dev_info *bdi) |
215 | { | |
216 | return bdi->capabilities & BDI_CAP_STABLE_WRITES; | |
217 | } | |
218 | ||
e4ad08fe MS |
219 | static inline bool bdi_cap_writeback_dirty(struct backing_dev_info *bdi) |
220 | { | |
221 | return !(bdi->capabilities & BDI_CAP_NO_WRITEBACK); | |
222 | } | |
223 | ||
224 | static inline bool bdi_cap_account_dirty(struct backing_dev_info *bdi) | |
225 | { | |
226 | return !(bdi->capabilities & BDI_CAP_NO_ACCT_DIRTY); | |
227 | } | |
1da177e4 | 228 | |
e4ad08fe MS |
229 | static inline bool bdi_cap_account_writeback(struct backing_dev_info *bdi) |
230 | { | |
231 | /* Paranoia: BDI_CAP_NO_WRITEBACK implies BDI_CAP_NO_ACCT_WB */ | |
232 | return !(bdi->capabilities & (BDI_CAP_NO_ACCT_WB | | |
233 | BDI_CAP_NO_WRITEBACK)); | |
234 | } | |
1da177e4 | 235 | |
e4ad08fe MS |
236 | static inline bool mapping_cap_writeback_dirty(struct address_space *mapping) |
237 | { | |
de1414a6 | 238 | return bdi_cap_writeback_dirty(inode_to_bdi(mapping->host)); |
e4ad08fe | 239 | } |
1da177e4 | 240 | |
e4ad08fe MS |
241 | static inline bool mapping_cap_account_dirty(struct address_space *mapping) |
242 | { | |
de1414a6 | 243 | return bdi_cap_account_dirty(inode_to_bdi(mapping->host)); |
e4ad08fe | 244 | } |
1da177e4 | 245 | |
03ba3782 JA |
246 | static inline int bdi_sched_wait(void *word) |
247 | { | |
248 | schedule(); | |
249 | return 0; | |
250 | } | |
251 | ||
89e9b9e0 TH |
252 | #ifdef CONFIG_CGROUP_WRITEBACK |
253 | ||
52ebea74 TH |
254 | struct bdi_writeback_congested * |
255 | wb_congested_get_create(struct backing_dev_info *bdi, int blkcg_id, gfp_t gfp); | |
256 | void wb_congested_put(struct bdi_writeback_congested *congested); | |
257 | struct bdi_writeback *wb_get_create(struct backing_dev_info *bdi, | |
258 | struct cgroup_subsys_state *memcg_css, | |
259 | gfp_t gfp); | |
52ebea74 TH |
260 | void wb_memcg_offline(struct mem_cgroup *memcg); |
261 | void wb_blkcg_offline(struct blkcg *blkcg); | |
703c2708 | 262 | int inode_congested(struct inode *inode, int cong_bits); |
52ebea74 | 263 | |
89e9b9e0 TH |
264 | /** |
265 | * inode_cgwb_enabled - test whether cgroup writeback is enabled on an inode | |
266 | * @inode: inode of interest | |
267 | * | |
268 | * cgroup writeback requires support from both the bdi and filesystem. | |
9badce00 TH |
269 | * Also, both memcg and iocg have to be on the default hierarchy. Test |
270 | * whether all conditions are met. | |
271 | * | |
272 | * Note that the test result may change dynamically on the same inode | |
273 | * depending on how memcg and iocg are configured. | |
89e9b9e0 TH |
274 | */ |
275 | static inline bool inode_cgwb_enabled(struct inode *inode) | |
276 | { | |
277 | struct backing_dev_info *bdi = inode_to_bdi(inode); | |
278 | ||
c0522908 TH |
279 | return cgroup_subsys_on_dfl(memory_cgrp_subsys) && |
280 | cgroup_subsys_on_dfl(io_cgrp_subsys) && | |
9badce00 | 281 | bdi_cap_account_dirty(bdi) && |
89e9b9e0 | 282 | (bdi->capabilities & BDI_CAP_CGROUP_WRITEBACK) && |
46b15caa | 283 | (inode->i_sb->s_iflags & SB_I_CGROUPWB); |
89e9b9e0 TH |
284 | } |
285 | ||
52ebea74 TH |
286 | /** |
287 | * wb_find_current - find wb for %current on a bdi | |
288 | * @bdi: bdi of interest | |
289 | * | |
290 | * Find the wb of @bdi which matches both the memcg and blkcg of %current. | |
291 | * Must be called under rcu_read_lock() which protects the returend wb. | |
292 | * NULL if not found. | |
293 | */ | |
294 | static inline struct bdi_writeback *wb_find_current(struct backing_dev_info *bdi) | |
295 | { | |
296 | struct cgroup_subsys_state *memcg_css; | |
297 | struct bdi_writeback *wb; | |
298 | ||
299 | memcg_css = task_css(current, memory_cgrp_id); | |
300 | if (!memcg_css->parent) | |
301 | return &bdi->wb; | |
302 | ||
303 | wb = radix_tree_lookup(&bdi->cgwb_tree, memcg_css->id); | |
304 | ||
305 | /* | |
306 | * %current's blkcg equals the effective blkcg of its memcg. No | |
307 | * need to use the relatively expensive cgroup_get_e_css(). | |
308 | */ | |
c165b3e3 | 309 | if (likely(wb && wb->blkcg_css == task_css(current, io_cgrp_id))) |
52ebea74 TH |
310 | return wb; |
311 | return NULL; | |
312 | } | |
313 | ||
314 | /** | |
315 | * wb_get_create_current - get or create wb for %current on a bdi | |
316 | * @bdi: bdi of interest | |
317 | * @gfp: allocation mask | |
318 | * | |
319 | * Equivalent to wb_get_create() on %current's memcg. This function is | |
320 | * called from a relatively hot path and optimizes the common cases using | |
321 | * wb_find_current(). | |
322 | */ | |
323 | static inline struct bdi_writeback * | |
324 | wb_get_create_current(struct backing_dev_info *bdi, gfp_t gfp) | |
325 | { | |
326 | struct bdi_writeback *wb; | |
327 | ||
328 | rcu_read_lock(); | |
329 | wb = wb_find_current(bdi); | |
330 | if (wb && unlikely(!wb_tryget(wb))) | |
331 | wb = NULL; | |
332 | rcu_read_unlock(); | |
333 | ||
334 | if (unlikely(!wb)) { | |
335 | struct cgroup_subsys_state *memcg_css; | |
336 | ||
337 | memcg_css = task_get_css(current, memory_cgrp_id); | |
338 | wb = wb_get_create(bdi, memcg_css, gfp); | |
339 | css_put(memcg_css); | |
340 | } | |
341 | return wb; | |
342 | } | |
343 | ||
aaa2cacf TH |
344 | /** |
345 | * inode_to_wb_is_valid - test whether an inode has a wb associated | |
346 | * @inode: inode of interest | |
347 | * | |
348 | * Returns %true if @inode has a wb associated. May be called without any | |
349 | * locking. | |
350 | */ | |
351 | static inline bool inode_to_wb_is_valid(struct inode *inode) | |
352 | { | |
353 | return inode->i_wb; | |
354 | } | |
355 | ||
52ebea74 TH |
356 | /** |
357 | * inode_to_wb - determine the wb of an inode | |
358 | * @inode: inode of interest | |
359 | * | |
aaa2cacf TH |
360 | * Returns the wb @inode is currently associated with. The caller must be |
361 | * holding either @inode->i_lock, @inode->i_mapping->tree_lock, or the | |
362 | * associated wb's list_lock. | |
52ebea74 TH |
363 | */ |
364 | static inline struct bdi_writeback *inode_to_wb(struct inode *inode) | |
365 | { | |
aaa2cacf TH |
366 | #ifdef CONFIG_LOCKDEP |
367 | WARN_ON_ONCE(debug_locks && | |
368 | (!lockdep_is_held(&inode->i_lock) && | |
369 | !lockdep_is_held(&inode->i_mapping->tree_lock) && | |
370 | !lockdep_is_held(&inode->i_wb->list_lock))); | |
371 | #endif | |
52ebea74 TH |
372 | return inode->i_wb; |
373 | } | |
374 | ||
682aa8e1 TH |
375 | /** |
376 | * unlocked_inode_to_wb_begin - begin unlocked inode wb access transaction | |
377 | * @inode: target inode | |
378 | * @lockedp: temp bool output param, to be passed to the end function | |
379 | * | |
380 | * The caller wants to access the wb associated with @inode but isn't | |
381 | * holding inode->i_lock, mapping->tree_lock or wb->list_lock. This | |
382 | * function determines the wb associated with @inode and ensures that the | |
383 | * association doesn't change until the transaction is finished with | |
384 | * unlocked_inode_to_wb_end(). | |
385 | * | |
386 | * The caller must call unlocked_inode_to_wb_end() with *@lockdep | |
387 | * afterwards and can't sleep during transaction. IRQ may or may not be | |
388 | * disabled on return. | |
389 | */ | |
390 | static inline struct bdi_writeback * | |
391 | unlocked_inode_to_wb_begin(struct inode *inode, bool *lockedp) | |
392 | { | |
393 | rcu_read_lock(); | |
394 | ||
395 | /* | |
396 | * Paired with store_release in inode_switch_wb_work_fn() and | |
397 | * ensures that we see the new wb if we see cleared I_WB_SWITCH. | |
398 | */ | |
399 | *lockedp = smp_load_acquire(&inode->i_state) & I_WB_SWITCH; | |
400 | ||
401 | if (unlikely(*lockedp)) | |
402 | spin_lock_irq(&inode->i_mapping->tree_lock); | |
aaa2cacf TH |
403 | |
404 | /* | |
405 | * Protected by either !I_WB_SWITCH + rcu_read_lock() or tree_lock. | |
406 | * inode_to_wb() will bark. Deref directly. | |
407 | */ | |
408 | return inode->i_wb; | |
682aa8e1 TH |
409 | } |
410 | ||
411 | /** | |
412 | * unlocked_inode_to_wb_end - end inode wb access transaction | |
413 | * @inode: target inode | |
414 | * @locked: *@lockedp from unlocked_inode_to_wb_begin() | |
415 | */ | |
416 | static inline void unlocked_inode_to_wb_end(struct inode *inode, bool locked) | |
417 | { | |
418 | if (unlikely(locked)) | |
419 | spin_unlock_irq(&inode->i_mapping->tree_lock); | |
420 | ||
421 | rcu_read_unlock(); | |
422 | } | |
423 | ||
89e9b9e0 TH |
424 | #else /* CONFIG_CGROUP_WRITEBACK */ |
425 | ||
426 | static inline bool inode_cgwb_enabled(struct inode *inode) | |
427 | { | |
428 | return false; | |
429 | } | |
430 | ||
52ebea74 TH |
431 | static inline struct bdi_writeback_congested * |
432 | wb_congested_get_create(struct backing_dev_info *bdi, int blkcg_id, gfp_t gfp) | |
433 | { | |
a13f35e8 TH |
434 | atomic_inc(&bdi->wb_congested->refcnt); |
435 | return bdi->wb_congested; | |
52ebea74 TH |
436 | } |
437 | ||
438 | static inline void wb_congested_put(struct bdi_writeback_congested *congested) | |
439 | { | |
a13f35e8 TH |
440 | if (atomic_dec_and_test(&congested->refcnt)) |
441 | kfree(congested); | |
52ebea74 TH |
442 | } |
443 | ||
52ebea74 TH |
444 | static inline struct bdi_writeback *wb_find_current(struct backing_dev_info *bdi) |
445 | { | |
446 | return &bdi->wb; | |
447 | } | |
448 | ||
449 | static inline struct bdi_writeback * | |
450 | wb_get_create_current(struct backing_dev_info *bdi, gfp_t gfp) | |
451 | { | |
452 | return &bdi->wb; | |
453 | } | |
454 | ||
aaa2cacf TH |
455 | static inline bool inode_to_wb_is_valid(struct inode *inode) |
456 | { | |
457 | return true; | |
458 | } | |
459 | ||
52ebea74 TH |
460 | static inline struct bdi_writeback *inode_to_wb(struct inode *inode) |
461 | { | |
462 | return &inode_to_bdi(inode)->wb; | |
463 | } | |
464 | ||
682aa8e1 TH |
465 | static inline struct bdi_writeback * |
466 | unlocked_inode_to_wb_begin(struct inode *inode, bool *lockedp) | |
467 | { | |
468 | return inode_to_wb(inode); | |
469 | } | |
470 | ||
471 | static inline void unlocked_inode_to_wb_end(struct inode *inode, bool locked) | |
472 | { | |
473 | } | |
474 | ||
52ebea74 TH |
475 | static inline void wb_memcg_offline(struct mem_cgroup *memcg) |
476 | { | |
477 | } | |
478 | ||
479 | static inline void wb_blkcg_offline(struct blkcg *blkcg) | |
480 | { | |
481 | } | |
482 | ||
703c2708 TH |
483 | static inline int inode_congested(struct inode *inode, int cong_bits) |
484 | { | |
485 | return wb_congested(&inode_to_bdi(inode)->wb, cong_bits); | |
486 | } | |
487 | ||
89e9b9e0 TH |
488 | #endif /* CONFIG_CGROUP_WRITEBACK */ |
489 | ||
703c2708 TH |
490 | static inline int inode_read_congested(struct inode *inode) |
491 | { | |
492 | return inode_congested(inode, 1 << WB_sync_congested); | |
493 | } | |
494 | ||
495 | static inline int inode_write_congested(struct inode *inode) | |
496 | { | |
497 | return inode_congested(inode, 1 << WB_async_congested); | |
498 | } | |
499 | ||
500 | static inline int inode_rw_congested(struct inode *inode) | |
501 | { | |
502 | return inode_congested(inode, (1 << WB_sync_congested) | | |
503 | (1 << WB_async_congested)); | |
504 | } | |
505 | ||
ec8a6f26 TH |
506 | static inline int bdi_congested(struct backing_dev_info *bdi, int cong_bits) |
507 | { | |
508 | return wb_congested(&bdi->wb, cong_bits); | |
509 | } | |
510 | ||
511 | static inline int bdi_read_congested(struct backing_dev_info *bdi) | |
512 | { | |
513 | return bdi_congested(bdi, 1 << WB_sync_congested); | |
514 | } | |
515 | ||
516 | static inline int bdi_write_congested(struct backing_dev_info *bdi) | |
517 | { | |
518 | return bdi_congested(bdi, 1 << WB_async_congested); | |
519 | } | |
520 | ||
521 | static inline int bdi_rw_congested(struct backing_dev_info *bdi) | |
522 | { | |
523 | return bdi_congested(bdi, (1 << WB_sync_congested) | | |
524 | (1 << WB_async_congested)); | |
525 | } | |
526 | ||
89e9b9e0 | 527 | #endif /* _LINUX_BACKING_DEV_H */ |