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Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | /* |
3 | * include/linux/backing-dev.h | |
4 | * | |
5 | * low-level device information and state which is propagated up through | |
6 | * to high-level code. | |
7 | */ | |
8 | ||
9 | #ifndef _LINUX_BACKING_DEV_H | |
10 | #define _LINUX_BACKING_DEV_H | |
11 | ||
cf0ca9fe | 12 | #include <linux/kernel.h> |
e4ad08fe | 13 | #include <linux/fs.h> |
03ba3782 | 14 | #include <linux/sched.h> |
a212b105 | 15 | #include <linux/blkdev.h> |
03ba3782 | 16 | #include <linux/writeback.h> |
52ebea74 | 17 | #include <linux/blk-cgroup.h> |
66114cad | 18 | #include <linux/backing-dev-defs.h> |
a13f35e8 | 19 | #include <linux/slab.h> |
de1414a6 | 20 | |
d03f6cdc JK |
21 | static inline struct backing_dev_info *bdi_get(struct backing_dev_info *bdi) |
22 | { | |
23 | kref_get(&bdi->refcnt); | |
24 | return bdi; | |
25 | } | |
26 | ||
27 | void bdi_put(struct backing_dev_info *bdi); | |
b2e8fb6e | 28 | |
7c4cc300 JK |
29 | __printf(2, 3) |
30 | int bdi_register(struct backing_dev_info *bdi, const char *fmt, ...); | |
a93f00b3 | 31 | __printf(2, 0) |
7c4cc300 JK |
32 | int bdi_register_va(struct backing_dev_info *bdi, const char *fmt, |
33 | va_list args); | |
df08c32c | 34 | int bdi_register_owner(struct backing_dev_info *bdi, struct device *owner); |
b02176f3 TH |
35 | void bdi_unregister(struct backing_dev_info *bdi); |
36 | ||
d03f6cdc | 37 | struct backing_dev_info *bdi_alloc_node(gfp_t gfp_mask, int node_id); |
baf7a616 JK |
38 | static inline struct backing_dev_info *bdi_alloc(gfp_t gfp_mask) |
39 | { | |
40 | return bdi_alloc_node(gfp_mask, NUMA_NO_NODE); | |
41 | } | |
b02176f3 | 42 | |
9ecf4866 | 43 | void wb_start_background_writeback(struct bdi_writeback *wb); |
f0054bb1 | 44 | void wb_workfn(struct work_struct *work); |
f0054bb1 | 45 | void wb_wakeup_delayed(struct bdi_writeback *wb); |
cf0ca9fe | 46 | |
03ba3782 | 47 | extern spinlock_t bdi_lock; |
66f3b8e2 JA |
48 | extern struct list_head bdi_list; |
49 | ||
839a8e86 | 50 | extern struct workqueue_struct *bdi_wq; |
d3f77dfd | 51 | extern struct workqueue_struct *bdi_async_bio_wq; |
839a8e86 | 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 | { |
104b4e51 | 70 | percpu_counter_add_batch(&wb->stat[item], amount, WB_STAT_BATCH); |
b2e8fb6e PZ |
71 | } |
72 | ||
93f78d88 | 73 | static inline void inc_wb_stat(struct bdi_writeback *wb, enum wb_stat_item item) |
b2e8fb6e | 74 | { |
3e8f399d | 75 | __add_wb_stat(wb, item, 1); |
b2e8fb6e PZ |
76 | } |
77 | ||
93f78d88 | 78 | static inline void dec_wb_stat(struct bdi_writeback *wb, enum wb_stat_item item) |
b2e8fb6e | 79 | { |
3e8f399d | 80 | __add_wb_stat(wb, item, -1); |
b2e8fb6e PZ |
81 | } |
82 | ||
93f78d88 | 83 | static inline s64 wb_stat(struct bdi_writeback *wb, enum wb_stat_item item) |
b2e8fb6e | 84 | { |
93f78d88 | 85 | return percpu_counter_read_positive(&wb->stat[item]); |
b2e8fb6e PZ |
86 | } |
87 | ||
93f78d88 | 88 | static inline s64 wb_stat_sum(struct bdi_writeback *wb, enum wb_stat_item item) |
e0bf68dd | 89 | { |
e3d3910a | 90 | return percpu_counter_sum_positive(&wb->stat[item]); |
e0bf68dd PZ |
91 | } |
92 | ||
93f78d88 | 93 | extern void wb_writeout_inc(struct bdi_writeback *wb); |
dd5656e5 | 94 | |
b2e8fb6e PZ |
95 | /* |
96 | * maximal error of a stat counter. | |
97 | */ | |
2bce774e | 98 | static inline unsigned long wb_stat_error(void) |
e0bf68dd | 99 | { |
b2e8fb6e | 100 | #ifdef CONFIG_SMP |
93f78d88 | 101 | return nr_cpu_ids * WB_STAT_BATCH; |
b2e8fb6e PZ |
102 | #else |
103 | return 1; | |
104 | #endif | |
e0bf68dd | 105 | } |
1da177e4 | 106 | |
189d3c4a | 107 | int bdi_set_min_ratio(struct backing_dev_info *bdi, unsigned int min_ratio); |
a42dde04 | 108 | int bdi_set_max_ratio(struct backing_dev_info *bdi, unsigned int max_ratio); |
189d3c4a | 109 | |
1da177e4 LT |
110 | /* |
111 | * Flags in backing_dev_info::capability | |
e4ad08fe MS |
112 | * |
113 | * The first three flags control whether dirty pages will contribute to the | |
114 | * VM's accounting and whether writepages() should be called for dirty pages | |
115 | * (something that would not, for example, be appropriate for ramfs) | |
116 | * | |
117 | * WARNING: these flags are closely related and should not normally be | |
118 | * used separately. The BDI_CAP_NO_ACCT_AND_WRITEBACK combines these | |
119 | * three flags into a single convenience macro. | |
120 | * | |
121 | * BDI_CAP_NO_ACCT_DIRTY: Dirty pages shouldn't contribute to accounting | |
122 | * BDI_CAP_NO_WRITEBACK: Don't write pages back | |
123 | * BDI_CAP_NO_ACCT_WB: Don't automatically account writeback pages | |
5a537485 | 124 | * BDI_CAP_STRICTLIMIT: Keep number of dirty pages below bdi threshold. |
89e9b9e0 TH |
125 | * |
126 | * BDI_CAP_CGROUP_WRITEBACK: Supports cgroup-aware writeback. | |
23c47d2a MK |
127 | * BDI_CAP_SYNCHRONOUS_IO: Device is so fast that asynchronous IO would be |
128 | * inefficient. | |
1da177e4 | 129 | */ |
e4ad08fe MS |
130 | #define BDI_CAP_NO_ACCT_DIRTY 0x00000001 |
131 | #define BDI_CAP_NO_WRITEBACK 0x00000002 | |
b4caecd4 CH |
132 | #define BDI_CAP_NO_ACCT_WB 0x00000004 |
133 | #define BDI_CAP_STABLE_WRITES 0x00000008 | |
134 | #define BDI_CAP_STRICTLIMIT 0x00000010 | |
89e9b9e0 | 135 | #define BDI_CAP_CGROUP_WRITEBACK 0x00000020 |
23c47d2a | 136 | #define BDI_CAP_SYNCHRONOUS_IO 0x00000040 |
1da177e4 | 137 | |
e4ad08fe MS |
138 | #define BDI_CAP_NO_ACCT_AND_WRITEBACK \ |
139 | (BDI_CAP_NO_WRITEBACK | BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_ACCT_WB) | |
140 | ||
5129a469 | 141 | extern struct backing_dev_info noop_backing_dev_info; |
1da177e4 | 142 | |
bc05873d TH |
143 | /** |
144 | * writeback_in_progress - determine whether there is writeback in progress | |
145 | * @wb: bdi_writeback of interest | |
146 | * | |
147 | * Determine whether there is writeback waiting to be handled against a | |
148 | * bdi_writeback. | |
149 | */ | |
150 | static inline bool writeback_in_progress(struct bdi_writeback *wb) | |
1da177e4 | 151 | { |
bc05873d | 152 | return test_bit(WB_writeback_running, &wb->state); |
1da177e4 LT |
153 | } |
154 | ||
a212b105 | 155 | static inline struct backing_dev_info *inode_to_bdi(struct inode *inode) |
1da177e4 | 156 | { |
a212b105 | 157 | struct super_block *sb; |
1da177e4 | 158 | |
a212b105 TH |
159 | if (!inode) |
160 | return &noop_backing_dev_info; | |
161 | ||
162 | sb = inode->i_sb; | |
163 | #ifdef CONFIG_BLOCK | |
164 | if (sb_is_blkdev_sb(sb)) | |
efa7c9f9 | 165 | return I_BDEV(inode)->bd_bdi; |
a212b105 TH |
166 | #endif |
167 | return sb->s_bdi; | |
1da177e4 LT |
168 | } |
169 | ||
ec8a6f26 | 170 | static inline int wb_congested(struct bdi_writeback *wb, int cong_bits) |
1da177e4 | 171 | { |
ec8a6f26 | 172 | struct backing_dev_info *bdi = wb->bdi; |
1da177e4 | 173 | |
ec8a6f26 TH |
174 | if (bdi->congested_fn) |
175 | return bdi->congested_fn(bdi->congested_data, cong_bits); | |
176 | return wb->congested->state & cong_bits; | |
1da177e4 | 177 | } |
373c0a7e | 178 | |
8aa7e847 | 179 | long congestion_wait(int sync, long timeout); |
e3c1ac58 | 180 | long wait_iff_congested(int sync, long timeout); |
1da177e4 | 181 | |
23c47d2a MK |
182 | static inline bool bdi_cap_synchronous_io(struct backing_dev_info *bdi) |
183 | { | |
184 | return bdi->capabilities & BDI_CAP_SYNCHRONOUS_IO; | |
185 | } | |
186 | ||
7d311cda DW |
187 | static inline bool bdi_cap_stable_pages_required(struct backing_dev_info *bdi) |
188 | { | |
189 | return bdi->capabilities & BDI_CAP_STABLE_WRITES; | |
190 | } | |
191 | ||
e4ad08fe MS |
192 | static inline bool bdi_cap_writeback_dirty(struct backing_dev_info *bdi) |
193 | { | |
194 | return !(bdi->capabilities & BDI_CAP_NO_WRITEBACK); | |
195 | } | |
196 | ||
197 | static inline bool bdi_cap_account_dirty(struct backing_dev_info *bdi) | |
198 | { | |
199 | return !(bdi->capabilities & BDI_CAP_NO_ACCT_DIRTY); | |
200 | } | |
1da177e4 | 201 | |
e4ad08fe MS |
202 | static inline bool bdi_cap_account_writeback(struct backing_dev_info *bdi) |
203 | { | |
204 | /* Paranoia: BDI_CAP_NO_WRITEBACK implies BDI_CAP_NO_ACCT_WB */ | |
205 | return !(bdi->capabilities & (BDI_CAP_NO_ACCT_WB | | |
206 | BDI_CAP_NO_WRITEBACK)); | |
207 | } | |
1da177e4 | 208 | |
e4ad08fe MS |
209 | static inline bool mapping_cap_writeback_dirty(struct address_space *mapping) |
210 | { | |
de1414a6 | 211 | return bdi_cap_writeback_dirty(inode_to_bdi(mapping->host)); |
e4ad08fe | 212 | } |
1da177e4 | 213 | |
e4ad08fe MS |
214 | static inline bool mapping_cap_account_dirty(struct address_space *mapping) |
215 | { | |
de1414a6 | 216 | return bdi_cap_account_dirty(inode_to_bdi(mapping->host)); |
e4ad08fe | 217 | } |
1da177e4 | 218 | |
03ba3782 JA |
219 | static inline int bdi_sched_wait(void *word) |
220 | { | |
221 | schedule(); | |
222 | return 0; | |
223 | } | |
224 | ||
89e9b9e0 TH |
225 | #ifdef CONFIG_CGROUP_WRITEBACK |
226 | ||
52ebea74 TH |
227 | struct bdi_writeback_congested * |
228 | wb_congested_get_create(struct backing_dev_info *bdi, int blkcg_id, gfp_t gfp); | |
229 | void wb_congested_put(struct bdi_writeback_congested *congested); | |
230 | struct bdi_writeback *wb_get_create(struct backing_dev_info *bdi, | |
231 | struct cgroup_subsys_state *memcg_css, | |
232 | gfp_t gfp); | |
52ebea74 TH |
233 | void wb_memcg_offline(struct mem_cgroup *memcg); |
234 | void wb_blkcg_offline(struct blkcg *blkcg); | |
703c2708 | 235 | int inode_congested(struct inode *inode, int cong_bits); |
52ebea74 | 236 | |
89e9b9e0 TH |
237 | /** |
238 | * inode_cgwb_enabled - test whether cgroup writeback is enabled on an inode | |
239 | * @inode: inode of interest | |
240 | * | |
241 | * cgroup writeback requires support from both the bdi and filesystem. | |
9badce00 TH |
242 | * Also, both memcg and iocg have to be on the default hierarchy. Test |
243 | * whether all conditions are met. | |
244 | * | |
245 | * Note that the test result may change dynamically on the same inode | |
246 | * depending on how memcg and iocg are configured. | |
89e9b9e0 TH |
247 | */ |
248 | static inline bool inode_cgwb_enabled(struct inode *inode) | |
249 | { | |
250 | struct backing_dev_info *bdi = inode_to_bdi(inode); | |
251 | ||
c0522908 TH |
252 | return cgroup_subsys_on_dfl(memory_cgrp_subsys) && |
253 | cgroup_subsys_on_dfl(io_cgrp_subsys) && | |
9badce00 | 254 | bdi_cap_account_dirty(bdi) && |
89e9b9e0 | 255 | (bdi->capabilities & BDI_CAP_CGROUP_WRITEBACK) && |
46b15caa | 256 | (inode->i_sb->s_iflags & SB_I_CGROUPWB); |
89e9b9e0 TH |
257 | } |
258 | ||
52ebea74 TH |
259 | /** |
260 | * wb_find_current - find wb for %current on a bdi | |
261 | * @bdi: bdi of interest | |
262 | * | |
263 | * Find the wb of @bdi which matches both the memcg and blkcg of %current. | |
264 | * Must be called under rcu_read_lock() which protects the returend wb. | |
265 | * NULL if not found. | |
266 | */ | |
267 | static inline struct bdi_writeback *wb_find_current(struct backing_dev_info *bdi) | |
268 | { | |
269 | struct cgroup_subsys_state *memcg_css; | |
270 | struct bdi_writeback *wb; | |
271 | ||
272 | memcg_css = task_css(current, memory_cgrp_id); | |
273 | if (!memcg_css->parent) | |
274 | return &bdi->wb; | |
275 | ||
276 | wb = radix_tree_lookup(&bdi->cgwb_tree, memcg_css->id); | |
277 | ||
278 | /* | |
279 | * %current's blkcg equals the effective blkcg of its memcg. No | |
280 | * need to use the relatively expensive cgroup_get_e_css(). | |
281 | */ | |
c165b3e3 | 282 | if (likely(wb && wb->blkcg_css == task_css(current, io_cgrp_id))) |
52ebea74 TH |
283 | return wb; |
284 | return NULL; | |
285 | } | |
286 | ||
287 | /** | |
288 | * wb_get_create_current - get or create wb for %current on a bdi | |
289 | * @bdi: bdi of interest | |
290 | * @gfp: allocation mask | |
291 | * | |
292 | * Equivalent to wb_get_create() on %current's memcg. This function is | |
293 | * called from a relatively hot path and optimizes the common cases using | |
294 | * wb_find_current(). | |
295 | */ | |
296 | static inline struct bdi_writeback * | |
297 | wb_get_create_current(struct backing_dev_info *bdi, gfp_t gfp) | |
298 | { | |
299 | struct bdi_writeback *wb; | |
300 | ||
301 | rcu_read_lock(); | |
302 | wb = wb_find_current(bdi); | |
303 | if (wb && unlikely(!wb_tryget(wb))) | |
304 | wb = NULL; | |
305 | rcu_read_unlock(); | |
306 | ||
307 | if (unlikely(!wb)) { | |
308 | struct cgroup_subsys_state *memcg_css; | |
309 | ||
310 | memcg_css = task_get_css(current, memory_cgrp_id); | |
311 | wb = wb_get_create(bdi, memcg_css, gfp); | |
312 | css_put(memcg_css); | |
313 | } | |
314 | return wb; | |
315 | } | |
316 | ||
aaa2cacf TH |
317 | /** |
318 | * inode_to_wb_is_valid - test whether an inode has a wb associated | |
319 | * @inode: inode of interest | |
320 | * | |
321 | * Returns %true if @inode has a wb associated. May be called without any | |
322 | * locking. | |
323 | */ | |
324 | static inline bool inode_to_wb_is_valid(struct inode *inode) | |
325 | { | |
326 | return inode->i_wb; | |
327 | } | |
328 | ||
52ebea74 TH |
329 | /** |
330 | * inode_to_wb - determine the wb of an inode | |
331 | * @inode: inode of interest | |
332 | * | |
aaa2cacf | 333 | * Returns the wb @inode is currently associated with. The caller must be |
b93b0163 | 334 | * holding either @inode->i_lock, the i_pages lock, or the |
aaa2cacf | 335 | * associated wb's list_lock. |
52ebea74 | 336 | */ |
05b93801 | 337 | static inline struct bdi_writeback *inode_to_wb(const struct inode *inode) |
52ebea74 | 338 | { |
aaa2cacf TH |
339 | #ifdef CONFIG_LOCKDEP |
340 | WARN_ON_ONCE(debug_locks && | |
341 | (!lockdep_is_held(&inode->i_lock) && | |
b93b0163 | 342 | !lockdep_is_held(&inode->i_mapping->i_pages.xa_lock) && |
aaa2cacf TH |
343 | !lockdep_is_held(&inode->i_wb->list_lock))); |
344 | #endif | |
52ebea74 TH |
345 | return inode->i_wb; |
346 | } | |
347 | ||
682aa8e1 TH |
348 | /** |
349 | * unlocked_inode_to_wb_begin - begin unlocked inode wb access transaction | |
350 | * @inode: target inode | |
2e898e4c | 351 | * @cookie: output param, to be passed to the end function |
682aa8e1 TH |
352 | * |
353 | * The caller wants to access the wb associated with @inode but isn't | |
b93b0163 | 354 | * holding inode->i_lock, the i_pages lock or wb->list_lock. This |
682aa8e1 TH |
355 | * function determines the wb associated with @inode and ensures that the |
356 | * association doesn't change until the transaction is finished with | |
357 | * unlocked_inode_to_wb_end(). | |
358 | * | |
2e898e4c GT |
359 | * The caller must call unlocked_inode_to_wb_end() with *@cookie afterwards and |
360 | * can't sleep during the transaction. IRQs may or may not be disabled on | |
361 | * return. | |
682aa8e1 TH |
362 | */ |
363 | static inline struct bdi_writeback * | |
2e898e4c | 364 | unlocked_inode_to_wb_begin(struct inode *inode, struct wb_lock_cookie *cookie) |
682aa8e1 TH |
365 | { |
366 | rcu_read_lock(); | |
367 | ||
368 | /* | |
a9519def | 369 | * Paired with store_release in inode_switch_wbs_work_fn() and |
682aa8e1 TH |
370 | * ensures that we see the new wb if we see cleared I_WB_SWITCH. |
371 | */ | |
2e898e4c | 372 | cookie->locked = smp_load_acquire(&inode->i_state) & I_WB_SWITCH; |
682aa8e1 | 373 | |
2e898e4c GT |
374 | if (unlikely(cookie->locked)) |
375 | xa_lock_irqsave(&inode->i_mapping->i_pages, cookie->flags); | |
aaa2cacf TH |
376 | |
377 | /* | |
b93b0163 MW |
378 | * Protected by either !I_WB_SWITCH + rcu_read_lock() or the i_pages |
379 | * lock. inode_to_wb() will bark. Deref directly. | |
aaa2cacf TH |
380 | */ |
381 | return inode->i_wb; | |
682aa8e1 TH |
382 | } |
383 | ||
384 | /** | |
385 | * unlocked_inode_to_wb_end - end inode wb access transaction | |
386 | * @inode: target inode | |
2e898e4c | 387 | * @cookie: @cookie from unlocked_inode_to_wb_begin() |
682aa8e1 | 388 | */ |
2e898e4c GT |
389 | static inline void unlocked_inode_to_wb_end(struct inode *inode, |
390 | struct wb_lock_cookie *cookie) | |
682aa8e1 | 391 | { |
2e898e4c GT |
392 | if (unlikely(cookie->locked)) |
393 | xa_unlock_irqrestore(&inode->i_mapping->i_pages, cookie->flags); | |
682aa8e1 TH |
394 | |
395 | rcu_read_unlock(); | |
396 | } | |
397 | ||
89e9b9e0 TH |
398 | #else /* CONFIG_CGROUP_WRITEBACK */ |
399 | ||
400 | static inline bool inode_cgwb_enabled(struct inode *inode) | |
401 | { | |
402 | return false; | |
403 | } | |
404 | ||
52ebea74 TH |
405 | static inline struct bdi_writeback_congested * |
406 | wb_congested_get_create(struct backing_dev_info *bdi, int blkcg_id, gfp_t gfp) | |
407 | { | |
e58dd0de | 408 | refcount_inc(&bdi->wb_congested->refcnt); |
a13f35e8 | 409 | return bdi->wb_congested; |
52ebea74 TH |
410 | } |
411 | ||
412 | static inline void wb_congested_put(struct bdi_writeback_congested *congested) | |
413 | { | |
e58dd0de | 414 | if (refcount_dec_and_test(&congested->refcnt)) |
a13f35e8 | 415 | kfree(congested); |
52ebea74 TH |
416 | } |
417 | ||
52ebea74 TH |
418 | static inline struct bdi_writeback *wb_find_current(struct backing_dev_info *bdi) |
419 | { | |
420 | return &bdi->wb; | |
421 | } | |
422 | ||
423 | static inline struct bdi_writeback * | |
424 | wb_get_create_current(struct backing_dev_info *bdi, gfp_t gfp) | |
425 | { | |
426 | return &bdi->wb; | |
427 | } | |
428 | ||
aaa2cacf TH |
429 | static inline bool inode_to_wb_is_valid(struct inode *inode) |
430 | { | |
431 | return true; | |
432 | } | |
433 | ||
52ebea74 TH |
434 | static inline struct bdi_writeback *inode_to_wb(struct inode *inode) |
435 | { | |
436 | return &inode_to_bdi(inode)->wb; | |
437 | } | |
438 | ||
682aa8e1 | 439 | static inline struct bdi_writeback * |
2e898e4c | 440 | unlocked_inode_to_wb_begin(struct inode *inode, struct wb_lock_cookie *cookie) |
682aa8e1 TH |
441 | { |
442 | return inode_to_wb(inode); | |
443 | } | |
444 | ||
2e898e4c GT |
445 | static inline void unlocked_inode_to_wb_end(struct inode *inode, |
446 | struct wb_lock_cookie *cookie) | |
682aa8e1 TH |
447 | { |
448 | } | |
449 | ||
52ebea74 TH |
450 | static inline void wb_memcg_offline(struct mem_cgroup *memcg) |
451 | { | |
452 | } | |
453 | ||
454 | static inline void wb_blkcg_offline(struct blkcg *blkcg) | |
455 | { | |
456 | } | |
457 | ||
703c2708 TH |
458 | static inline int inode_congested(struct inode *inode, int cong_bits) |
459 | { | |
460 | return wb_congested(&inode_to_bdi(inode)->wb, cong_bits); | |
461 | } | |
462 | ||
89e9b9e0 TH |
463 | #endif /* CONFIG_CGROUP_WRITEBACK */ |
464 | ||
703c2708 TH |
465 | static inline int inode_read_congested(struct inode *inode) |
466 | { | |
467 | return inode_congested(inode, 1 << WB_sync_congested); | |
468 | } | |
469 | ||
470 | static inline int inode_write_congested(struct inode *inode) | |
471 | { | |
472 | return inode_congested(inode, 1 << WB_async_congested); | |
473 | } | |
474 | ||
475 | static inline int inode_rw_congested(struct inode *inode) | |
476 | { | |
477 | return inode_congested(inode, (1 << WB_sync_congested) | | |
478 | (1 << WB_async_congested)); | |
479 | } | |
480 | ||
ec8a6f26 TH |
481 | static inline int bdi_congested(struct backing_dev_info *bdi, int cong_bits) |
482 | { | |
483 | return wb_congested(&bdi->wb, cong_bits); | |
484 | } | |
485 | ||
486 | static inline int bdi_read_congested(struct backing_dev_info *bdi) | |
487 | { | |
488 | return bdi_congested(bdi, 1 << WB_sync_congested); | |
489 | } | |
490 | ||
491 | static inline int bdi_write_congested(struct backing_dev_info *bdi) | |
492 | { | |
493 | return bdi_congested(bdi, 1 << WB_async_congested); | |
494 | } | |
495 | ||
496 | static inline int bdi_rw_congested(struct backing_dev_info *bdi) | |
497 | { | |
498 | return bdi_congested(bdi, (1 << WB_sync_congested) | | |
499 | (1 << WB_async_congested)); | |
500 | } | |
501 | ||
89e9b9e0 | 502 | #endif /* _LINUX_BACKING_DEV_H */ |