Blame view
fs/fs-writeback.c
70.4 KB
1da177e4c Linux-2.6.12-rc2 |
1 2 3 4 5 6 7 8 9 10 |
/* * fs/fs-writeback.c * * Copyright (C) 2002, Linus Torvalds. * * Contains all the functions related to writing back and waiting * upon dirty inodes against superblocks, and writing back dirty * pages against inodes. ie: data writeback. Writeout of the * inode itself is not handled here. * |
e1f8e8744 Remove Andrew Mor... |
11 |
* 10Apr2002 Andrew Morton |
1da177e4c Linux-2.6.12-rc2 |
12 13 14 15 16 |
* Split out of fs/inode.c * Additions for address_space-based writeback */ #include <linux/kernel.h> |
630d9c472 fs: reduce the us... |
17 |
#include <linux/export.h> |
1da177e4c Linux-2.6.12-rc2 |
18 |
#include <linux/spinlock.h> |
5a0e3ad6a include cleanup: ... |
19 |
#include <linux/slab.h> |
1da177e4c Linux-2.6.12-rc2 |
20 21 22 |
#include <linux/sched.h> #include <linux/fs.h> #include <linux/mm.h> |
bc31b86a5 writeback: move M... |
23 |
#include <linux/pagemap.h> |
03ba3782e writeback: switch... |
24 |
#include <linux/kthread.h> |
1da177e4c Linux-2.6.12-rc2 |
25 26 27 |
#include <linux/writeback.h> #include <linux/blkdev.h> #include <linux/backing-dev.h> |
455b28646 writeback: Initia... |
28 |
#include <linux/tracepoint.h> |
719ea2fbb new helpers: lock... |
29 |
#include <linux/device.h> |
21c6321fb writeback: reloca... |
30 |
#include <linux/memcontrol.h> |
07f3f05c1 [PATCH] BLOCK: Mo... |
31 |
#include "internal.h" |
1da177e4c Linux-2.6.12-rc2 |
32 |
|
d0bceac74 writeback: get ri... |
33 |
/* |
bc31b86a5 writeback: move M... |
34 35 |
* 4MB minimal write chunk size */ |
09cbfeaf1 mm, fs: get rid o... |
36 |
#define MIN_WRITEBACK_PAGES (4096UL >> (PAGE_SHIFT - 10)) |
bc31b86a5 writeback: move M... |
37 |
|
cc395d7f1 writeback: implem... |
38 39 40 |
struct wb_completion { atomic_t cnt; }; |
bc31b86a5 writeback: move M... |
41 |
/* |
c4a77a6c7 writeback: make w... |
42 43 |
* Passed into wb_writeback(), essentially a subset of writeback_control */ |
83ba7b071 writeback: simpli... |
44 |
struct wb_writeback_work { |
c4a77a6c7 writeback: make w... |
45 46 |
long nr_pages; struct super_block *sb; |
0dc83bd30 Revert "writeback... |
47 |
unsigned long *older_than_this; |
c4a77a6c7 writeback: make w... |
48 |
enum writeback_sync_modes sync_mode; |
6e6938b6d writeback: introd... |
49 |
unsigned int tagged_writepages:1; |
52957fe1c fs-writeback.c: b... |
50 51 52 |
unsigned int for_kupdate:1; unsigned int range_cyclic:1; unsigned int for_background:1; |
7747bd4bc sync: don't block... |
53 |
unsigned int for_sync:1; /* sync(2) WB_SYNC_ALL writeback */ |
ac7b19a34 writeback: add wb... |
54 |
unsigned int auto_free:1; /* free on completion */ |
0e175a183 writeback: Add a ... |
55 |
enum wb_reason reason; /* why was writeback initiated? */ |
c4a77a6c7 writeback: make w... |
56 |
|
8010c3b63 writeback: add co... |
57 |
struct list_head list; /* pending work list */ |
cc395d7f1 writeback: implem... |
58 |
struct wb_completion *done; /* set if the caller waits */ |
03ba3782e writeback: switch... |
59 |
}; |
a2f487069 fs: make sure the... |
60 |
/* |
cc395d7f1 writeback: implem... |
61 62 63 64 65 66 67 68 69 70 71 72 73 |
* If one wants to wait for one or more wb_writeback_works, each work's * ->done should be set to a wb_completion defined using the following * macro. Once all work items are issued with wb_queue_work(), the caller * can wait for the completion of all using wb_wait_for_completion(). Work * items which are waited upon aren't freed automatically on completion. */ #define DEFINE_WB_COMPLETION_ONSTACK(cmpl) \ struct wb_completion cmpl = { \ .cnt = ATOMIC_INIT(1), \ } /* |
a2f487069 fs: make sure the... |
74 75 76 77 78 79 80 81 82 83 |
* If an inode is constantly having its pages dirtied, but then the * updates stop dirtytime_expire_interval seconds in the past, it's * possible for the worst case time between when an inode has its * timestamps updated and when they finally get written out to be two * dirtytime_expire_intervals. We set the default to 12 hours (in * seconds), which means most of the time inodes will have their * timestamps written to disk after 12 hours, but in the worst case a * few inodes might not their timestamps updated for 24 hours. */ unsigned int dirtytime_expire_interval = 12 * 60 * 60; |
7ccf19a80 fs: inode split I... |
84 85 |
static inline struct inode *wb_inode(struct list_head *head) { |
c7f540849 inode: rename i_w... |
86 |
return list_entry(head, struct inode, i_io_list); |
7ccf19a80 fs: inode split I... |
87 |
} |
15eb77a07 writeback: fix NU... |
88 89 90 91 92 93 94 |
/* * Include the creation of the trace points after defining the * wb_writeback_work structure and inline functions so that the definition * remains local to this file. */ #define CREATE_TRACE_POINTS #include <trace/events/writeback.h> |
774016b2d GFS2: journal dat... |
95 |
EXPORT_TRACEPOINT_SYMBOL_GPL(wbc_writepage); |
d6c10f1fc writeback: implem... |
96 97 98 99 100 101 |
static bool wb_io_lists_populated(struct bdi_writeback *wb) { if (wb_has_dirty_io(wb)) { return false; } else { set_bit(WB_has_dirty_io, &wb->state); |
95a46c65e writeback: make b... |
102 |
WARN_ON_ONCE(!wb->avg_write_bandwidth); |
766a9d6e6 writeback: implem... |
103 104 |
atomic_long_add(wb->avg_write_bandwidth, &wb->bdi->tot_write_bandwidth); |
d6c10f1fc writeback: implem... |
105 106 107 108 109 110 111 |
return true; } } static void wb_io_lists_depopulated(struct bdi_writeback *wb) { if (wb_has_dirty_io(wb) && list_empty(&wb->b_dirty) && |
766a9d6e6 writeback: implem... |
112 |
list_empty(&wb->b_io) && list_empty(&wb->b_more_io)) { |
d6c10f1fc writeback: implem... |
113 |
clear_bit(WB_has_dirty_io, &wb->state); |
95a46c65e writeback: make b... |
114 115 |
WARN_ON_ONCE(atomic_long_sub_return(wb->avg_write_bandwidth, &wb->bdi->tot_write_bandwidth) < 0); |
766a9d6e6 writeback: implem... |
116 |
} |
d6c10f1fc writeback: implem... |
117 118 119 |
} /** |
c7f540849 inode: rename i_w... |
120 |
* inode_io_list_move_locked - move an inode onto a bdi_writeback IO list |
d6c10f1fc writeback: implem... |
121 122 123 124 |
* @inode: inode to be moved * @wb: target bdi_writeback * @head: one of @wb->b_{dirty|io|more_io} * |
c7f540849 inode: rename i_w... |
125 |
* Move @inode->i_io_list to @list of @wb and set %WB_has_dirty_io. |
d6c10f1fc writeback: implem... |
126 127 128 |
* Returns %true if @inode is the first occupant of the !dirty_time IO * lists; otherwise, %false. */ |
c7f540849 inode: rename i_w... |
129 |
static bool inode_io_list_move_locked(struct inode *inode, |
d6c10f1fc writeback: implem... |
130 131 132 133 |
struct bdi_writeback *wb, struct list_head *head) { assert_spin_locked(&wb->list_lock); |
c7f540849 inode: rename i_w... |
134 |
list_move(&inode->i_io_list, head); |
d6c10f1fc writeback: implem... |
135 136 137 138 139 140 141 142 143 144 |
/* dirty_time doesn't count as dirty_io until expiration */ if (head != &wb->b_dirty_time) return wb_io_lists_populated(wb); wb_io_lists_depopulated(wb); return false; } /** |
c7f540849 inode: rename i_w... |
145 |
* inode_io_list_del_locked - remove an inode from its bdi_writeback IO list |
d6c10f1fc writeback: implem... |
146 147 148 149 150 151 |
* @inode: inode to be removed * @wb: bdi_writeback @inode is being removed from * * Remove @inode which may be on one of @wb->b_{dirty|io|more_io} lists and * clear %WB_has_dirty_io if all are empty afterwards. */ |
c7f540849 inode: rename i_w... |
152 |
static void inode_io_list_del_locked(struct inode *inode, |
d6c10f1fc writeback: implem... |
153 154 155 |
struct bdi_writeback *wb) { assert_spin_locked(&wb->list_lock); |
c7f540849 inode: rename i_w... |
156 |
list_del_init(&inode->i_io_list); |
d6c10f1fc writeback: implem... |
157 158 |
wb_io_lists_depopulated(wb); } |
f0054bb1e writeback: move b... |
159 |
static void wb_wakeup(struct bdi_writeback *wb) |
5acda9d12 bdi: avoid oops o... |
160 |
{ |
f0054bb1e writeback: move b... |
161 162 163 164 |
spin_lock_bh(&wb->work_lock); if (test_bit(WB_registered, &wb->state)) mod_delayed_work(bdi_wq, &wb->dwork, 0); spin_unlock_bh(&wb->work_lock); |
5acda9d12 bdi: avoid oops o... |
165 |
} |
f0054bb1e writeback: move b... |
166 167 |
static void wb_queue_work(struct bdi_writeback *wb, struct wb_writeback_work *work) |
6585027a5 writeback: integr... |
168 |
{ |
5634cc2aa writeback: update... |
169 |
trace_writeback_queue(wb, work); |
6585027a5 writeback: integr... |
170 |
|
f0054bb1e writeback: move b... |
171 |
spin_lock_bh(&wb->work_lock); |
8a1270cda writeback: remove... |
172 |
if (!test_bit(WB_registered, &wb->state)) |
5acda9d12 bdi: avoid oops o... |
173 |
goto out_unlock; |
cc395d7f1 writeback: implem... |
174 175 |
if (work->done) atomic_inc(&work->done->cnt); |
f0054bb1e writeback: move b... |
176 177 |
list_add_tail(&work->list, &wb->work_list); mod_delayed_work(bdi_wq, &wb->dwork, 0); |
5acda9d12 bdi: avoid oops o... |
178 |
out_unlock: |
f0054bb1e writeback: move b... |
179 |
spin_unlock_bh(&wb->work_lock); |
1da177e4c Linux-2.6.12-rc2 |
180 |
} |
cc395d7f1 writeback: implem... |
181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 |
/** * wb_wait_for_completion - wait for completion of bdi_writeback_works * @bdi: bdi work items were issued to * @done: target wb_completion * * Wait for one or more work items issued to @bdi with their ->done field * set to @done, which should have been defined with * DEFINE_WB_COMPLETION_ONSTACK(). This function returns after all such * work items are completed. Work items which are waited upon aren't freed * automatically on completion. */ static void wb_wait_for_completion(struct backing_dev_info *bdi, struct wb_completion *done) { atomic_dec(&done->cnt); /* put down the initial count */ wait_event(bdi->wb_waitq, !atomic_read(&done->cnt)); } |
703c27088 writeback: implem... |
198 |
#ifdef CONFIG_CGROUP_WRITEBACK |
2a8149081 writeback: implem... |
199 200 201 202 203 204 205 206 207 208 209 210 211 |
/* parameters for foreign inode detection, see wb_detach_inode() */ #define WB_FRN_TIME_SHIFT 13 /* 1s = 2^13, upto 8 secs w/ 16bit */ #define WB_FRN_TIME_AVG_SHIFT 3 /* avg = avg * 7/8 + new * 1/8 */ #define WB_FRN_TIME_CUT_DIV 2 /* ignore rounds < avg / 2 */ #define WB_FRN_TIME_PERIOD (2 * (1 << WB_FRN_TIME_SHIFT)) /* 2s */ #define WB_FRN_HIST_SLOTS 16 /* inode->i_wb_frn_history is 16bit */ #define WB_FRN_HIST_UNIT (WB_FRN_TIME_PERIOD / WB_FRN_HIST_SLOTS) /* each slot's duration is 2s / 16 */ #define WB_FRN_HIST_THR_SLOTS (WB_FRN_HIST_SLOTS / 2) /* if foreign slots >= 8, switch */ #define WB_FRN_HIST_MAX_SLOTS (WB_FRN_HIST_THR_SLOTS / 2 + 1) /* one round can affect upto 5 slots */ |
a1a0e23e4 writeback: flush ... |
212 213 |
static atomic_t isw_nr_in_flight = ATOMIC_INIT(0); static struct workqueue_struct *isw_wq; |
21c6321fb writeback: reloca... |
214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 |
void __inode_attach_wb(struct inode *inode, struct page *page) { struct backing_dev_info *bdi = inode_to_bdi(inode); struct bdi_writeback *wb = NULL; if (inode_cgwb_enabled(inode)) { struct cgroup_subsys_state *memcg_css; if (page) { memcg_css = mem_cgroup_css_from_page(page); wb = wb_get_create(bdi, memcg_css, GFP_ATOMIC); } else { /* must pin memcg_css, see wb_get_create() */ memcg_css = task_get_css(current, memory_cgrp_id); wb = wb_get_create(bdi, memcg_css, GFP_ATOMIC); css_put(memcg_css); } } if (!wb) wb = &bdi->wb; /* * There may be multiple instances of this function racing to * update the same inode. Use cmpxchg() to tell the winner. */ if (unlikely(cmpxchg(&inode->i_wb, NULL, wb))) wb_put(wb); } |
703c27088 writeback: implem... |
243 |
/** |
87e1d789b writeback: implem... |
244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 |
* locked_inode_to_wb_and_lock_list - determine a locked inode's wb and lock it * @inode: inode of interest with i_lock held * * Returns @inode's wb with its list_lock held. @inode->i_lock must be * held on entry and is released on return. The returned wb is guaranteed * to stay @inode's associated wb until its list_lock is released. */ static struct bdi_writeback * locked_inode_to_wb_and_lock_list(struct inode *inode) __releases(&inode->i_lock) __acquires(&wb->list_lock) { while (true) { struct bdi_writeback *wb = inode_to_wb(inode); /* * inode_to_wb() association is protected by both * @inode->i_lock and @wb->list_lock but list_lock nests * outside i_lock. Drop i_lock and verify that the * association hasn't changed after acquiring list_lock. */ wb_get(wb); spin_unlock(&inode->i_lock); spin_lock(&wb->list_lock); |
87e1d789b writeback: implem... |
268 |
|
aaa2cacf8 writeback: add lo... |
269 |
/* i_wb may have changed inbetween, can't use inode_to_wb() */ |
614a4e377 writeback, cgroup... |
270 271 272 273 |
if (likely(wb == inode->i_wb)) { wb_put(wb); /* @inode already has ref */ return wb; } |
87e1d789b writeback: implem... |
274 275 |
spin_unlock(&wb->list_lock); |
614a4e377 writeback, cgroup... |
276 |
wb_put(wb); |
87e1d789b writeback: implem... |
277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 |
cpu_relax(); spin_lock(&inode->i_lock); } } /** * inode_to_wb_and_lock_list - determine an inode's wb and lock it * @inode: inode of interest * * Same as locked_inode_to_wb_and_lock_list() but @inode->i_lock isn't held * on entry. */ static struct bdi_writeback *inode_to_wb_and_lock_list(struct inode *inode) __acquires(&wb->list_lock) { spin_lock(&inode->i_lock); return locked_inode_to_wb_and_lock_list(inode); } |
682aa8e1a writeback: implem... |
295 296 297 298 299 300 301 302 303 304 305 306 307 |
struct inode_switch_wbs_context { struct inode *inode; struct bdi_writeback *new_wb; struct rcu_head rcu_head; struct work_struct work; }; static void inode_switch_wbs_work_fn(struct work_struct *work) { struct inode_switch_wbs_context *isw = container_of(work, struct inode_switch_wbs_context, work); struct inode *inode = isw->inode; |
d10c80955 writeback: implem... |
308 309 |
struct address_space *mapping = inode->i_mapping; struct bdi_writeback *old_wb = inode->i_wb; |
682aa8e1a writeback: implem... |
310 |
struct bdi_writeback *new_wb = isw->new_wb; |
d10c80955 writeback: implem... |
311 312 313 |
struct radix_tree_iter iter; bool switched = false; void **slot; |
682aa8e1a writeback: implem... |
314 315 316 317 318 319 |
/* * By the time control reaches here, RCU grace period has passed * since I_WB_SWITCH assertion and all wb stat update transactions * between unlocked_inode_to_wb_begin/end() are guaranteed to be * synchronizing against mapping->tree_lock. |
d10c80955 writeback: implem... |
320 321 322 323 |
* * Grabbing old_wb->list_lock, inode->i_lock and mapping->tree_lock * gives us exclusion against all wb related operations on @inode * including IO list manipulations and stat updates. |
682aa8e1a writeback: implem... |
324 |
*/ |
d10c80955 writeback: implem... |
325 326 327 328 329 330 331 |
if (old_wb < new_wb) { spin_lock(&old_wb->list_lock); spin_lock_nested(&new_wb->list_lock, SINGLE_DEPTH_NESTING); } else { spin_lock(&new_wb->list_lock); spin_lock_nested(&old_wb->list_lock, SINGLE_DEPTH_NESTING); } |
682aa8e1a writeback: implem... |
332 |
spin_lock(&inode->i_lock); |
d10c80955 writeback: implem... |
333 334 335 336 |
spin_lock_irq(&mapping->tree_lock); /* * Once I_FREEING is visible under i_lock, the eviction path owns |
c7f540849 inode: rename i_w... |
337 |
* the inode and we shouldn't modify ->i_io_list. |
d10c80955 writeback: implem... |
338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 |
*/ if (unlikely(inode->i_state & I_FREEING)) goto skip_switch; /* * Count and transfer stats. Note that PAGECACHE_TAG_DIRTY points * to possibly dirty pages while PAGECACHE_TAG_WRITEBACK points to * pages actually under underwriteback. */ radix_tree_for_each_tagged(slot, &mapping->page_tree, &iter, 0, PAGECACHE_TAG_DIRTY) { struct page *page = radix_tree_deref_slot_protected(slot, &mapping->tree_lock); if (likely(page) && PageDirty(page)) { __dec_wb_stat(old_wb, WB_RECLAIMABLE); __inc_wb_stat(new_wb, WB_RECLAIMABLE); } } radix_tree_for_each_tagged(slot, &mapping->page_tree, &iter, 0, PAGECACHE_TAG_WRITEBACK) { struct page *page = radix_tree_deref_slot_protected(slot, &mapping->tree_lock); if (likely(page)) { WARN_ON_ONCE(!PageWriteback(page)); __dec_wb_stat(old_wb, WB_WRITEBACK); __inc_wb_stat(new_wb, WB_WRITEBACK); } } wb_get(new_wb); /* * Transfer to @new_wb's IO list if necessary. The specific list * @inode was on is ignored and the inode is put on ->b_dirty which * is always correct including from ->b_dirty_time. The transfer * preserves @inode->dirtied_when ordering. */ |
c7f540849 inode: rename i_w... |
376 |
if (!list_empty(&inode->i_io_list)) { |
d10c80955 writeback: implem... |
377 |
struct inode *pos; |
c7f540849 inode: rename i_w... |
378 |
inode_io_list_del_locked(inode, old_wb); |
d10c80955 writeback: implem... |
379 |
inode->i_wb = new_wb; |
c7f540849 inode: rename i_w... |
380 |
list_for_each_entry(pos, &new_wb->b_dirty, i_io_list) |
d10c80955 writeback: implem... |
381 382 383 |
if (time_after_eq(inode->dirtied_when, pos->dirtied_when)) break; |
c7f540849 inode: rename i_w... |
384 |
inode_io_list_move_locked(inode, new_wb, pos->i_io_list.prev); |
d10c80955 writeback: implem... |
385 386 387 |
} else { inode->i_wb = new_wb; } |
682aa8e1a writeback: implem... |
388 |
|
d10c80955 writeback: implem... |
389 |
/* ->i_wb_frn updates may race wbc_detach_inode() but doesn't matter */ |
682aa8e1a writeback: implem... |
390 391 392 |
inode->i_wb_frn_winner = 0; inode->i_wb_frn_avg_time = 0; inode->i_wb_frn_history = 0; |
d10c80955 writeback: implem... |
393 394 |
switched = true; skip_switch: |
682aa8e1a writeback: implem... |
395 396 397 398 399 |
/* * Paired with load_acquire in unlocked_inode_to_wb_begin() and * ensures that the new wb is visible if they see !I_WB_SWITCH. */ smp_store_release(&inode->i_state, inode->i_state & ~I_WB_SWITCH); |
d10c80955 writeback: implem... |
400 |
spin_unlock_irq(&mapping->tree_lock); |
682aa8e1a writeback: implem... |
401 |
spin_unlock(&inode->i_lock); |
d10c80955 writeback: implem... |
402 403 |
spin_unlock(&new_wb->list_lock); spin_unlock(&old_wb->list_lock); |
682aa8e1a writeback: implem... |
404 |
|
d10c80955 writeback: implem... |
405 406 407 408 |
if (switched) { wb_wakeup(new_wb); wb_put(old_wb); } |
682aa8e1a writeback: implem... |
409 |
wb_put(new_wb); |
d10c80955 writeback: implem... |
410 411 |
iput(inode); |
682aa8e1a writeback: implem... |
412 |
kfree(isw); |
a1a0e23e4 writeback: flush ... |
413 414 |
atomic_dec(&isw_nr_in_flight); |
682aa8e1a writeback: implem... |
415 416 417 418 419 420 421 422 423 |
} static void inode_switch_wbs_rcu_fn(struct rcu_head *rcu_head) { struct inode_switch_wbs_context *isw = container_of(rcu_head, struct inode_switch_wbs_context, rcu_head); /* needs to grab bh-unsafe locks, bounce to work item */ INIT_WORK(&isw->work, inode_switch_wbs_work_fn); |
a1a0e23e4 writeback: flush ... |
424 |
queue_work(isw_wq, &isw->work); |
682aa8e1a writeback: implem... |
425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 |
} /** * inode_switch_wbs - change the wb association of an inode * @inode: target inode * @new_wb_id: ID of the new wb * * Switch @inode's wb association to the wb identified by @new_wb_id. The * switching is performed asynchronously and may fail silently. */ static void inode_switch_wbs(struct inode *inode, int new_wb_id) { struct backing_dev_info *bdi = inode_to_bdi(inode); struct cgroup_subsys_state *memcg_css; struct inode_switch_wbs_context *isw; /* noop if seems to be already in progress */ if (inode->i_state & I_WB_SWITCH) return; isw = kzalloc(sizeof(*isw), GFP_ATOMIC); if (!isw) return; /* find and pin the new wb */ rcu_read_lock(); memcg_css = css_from_id(new_wb_id, &memory_cgrp_subsys); if (memcg_css) isw->new_wb = wb_get_create(bdi, memcg_css, GFP_ATOMIC); rcu_read_unlock(); if (!isw->new_wb) goto out_free; /* while holding I_WB_SWITCH, no one else can update the association */ spin_lock(&inode->i_lock); |
a1a0e23e4 writeback: flush ... |
460 461 462 463 464 465 |
if (!(inode->i_sb->s_flags & MS_ACTIVE) || inode->i_state & (I_WB_SWITCH | I_FREEING) || inode_to_wb(inode) == isw->new_wb) { spin_unlock(&inode->i_lock); goto out_free; } |
682aa8e1a writeback: implem... |
466 |
inode->i_state |= I_WB_SWITCH; |
745249555 writeback: inode ... |
467 |
__iget(inode); |
682aa8e1a writeback: implem... |
468 |
spin_unlock(&inode->i_lock); |
682aa8e1a writeback: implem... |
469 |
isw->inode = inode; |
a1a0e23e4 writeback: flush ... |
470 |
atomic_inc(&isw_nr_in_flight); |
682aa8e1a writeback: implem... |
471 472 473 474 475 476 477 478 479 480 481 482 483 484 |
/* * In addition to synchronizing among switchers, I_WB_SWITCH tells * the RCU protected stat update paths to grab the mapping's * tree_lock so that stat transfer can synchronize against them. * Let's continue after I_WB_SWITCH is guaranteed to be visible. */ call_rcu(&isw->rcu_head, inode_switch_wbs_rcu_fn); return; out_free: if (isw->new_wb) wb_put(isw->new_wb); kfree(isw); } |
87e1d789b writeback: implem... |
485 |
/** |
b16b1deb5 writeback: make w... |
486 487 488 489 490 491 492 493 494 495 496 497 |
* wbc_attach_and_unlock_inode - associate wbc with target inode and unlock it * @wbc: writeback_control of interest * @inode: target inode * * @inode is locked and about to be written back under the control of @wbc. * Record @inode's writeback context into @wbc and unlock the i_lock. On * writeback completion, wbc_detach_inode() should be called. This is used * to track the cgroup writeback context. */ void wbc_attach_and_unlock_inode(struct writeback_control *wbc, struct inode *inode) { |
dd73e4b7d writeback: do for... |
498 499 500 501 |
if (!inode_cgwb_enabled(inode)) { spin_unlock(&inode->i_lock); return; } |
b16b1deb5 writeback: make w... |
502 |
wbc->wb = inode_to_wb(inode); |
2a8149081 writeback: implem... |
503 504 505 506 507 508 509 510 |
wbc->inode = inode; wbc->wb_id = wbc->wb->memcg_css->id; wbc->wb_lcand_id = inode->i_wb_frn_winner; wbc->wb_tcand_id = 0; wbc->wb_bytes = 0; wbc->wb_lcand_bytes = 0; wbc->wb_tcand_bytes = 0; |
b16b1deb5 writeback: make w... |
511 512 |
wb_get(wbc->wb); spin_unlock(&inode->i_lock); |
e8a7abf5a writeback: disass... |
513 514 515 516 517 518 519 |
/* * A dying wb indicates that the memcg-blkcg mapping has changed * and a new wb is already serving the memcg. Switch immediately. */ if (unlikely(wb_dying(wbc->wb))) inode_switch_wbs(inode, wbc->wb_id); |
b16b1deb5 writeback: make w... |
520 521 522 |
} /** |
2a8149081 writeback: implem... |
523 524 |
* wbc_detach_inode - disassociate wbc from inode and perform foreign detection * @wbc: writeback_control of the just finished writeback |
b16b1deb5 writeback: make w... |
525 526 527 |
* * To be called after a writeback attempt of an inode finishes and undoes * wbc_attach_and_unlock_inode(). Can be called under any context. |
2a8149081 writeback: implem... |
528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 |
* * As concurrent write sharing of an inode is expected to be very rare and * memcg only tracks page ownership on first-use basis severely confining * the usefulness of such sharing, cgroup writeback tracks ownership * per-inode. While the support for concurrent write sharing of an inode * is deemed unnecessary, an inode being written to by different cgroups at * different points in time is a lot more common, and, more importantly, * charging only by first-use can too readily lead to grossly incorrect * behaviors (single foreign page can lead to gigabytes of writeback to be * incorrectly attributed). * * To resolve this issue, cgroup writeback detects the majority dirtier of * an inode and transfers the ownership to it. To avoid unnnecessary * oscillation, the detection mechanism keeps track of history and gives * out the switch verdict only if the foreign usage pattern is stable over * a certain amount of time and/or writeback attempts. * * On each writeback attempt, @wbc tries to detect the majority writer * using Boyer-Moore majority vote algorithm. In addition to the byte * count from the majority voting, it also counts the bytes written for the * current wb and the last round's winner wb (max of last round's current * wb, the winner from two rounds ago, and the last round's majority * candidate). Keeping track of the historical winner helps the algorithm * to semi-reliably detect the most active writer even when it's not the * absolute majority. * * Once the winner of the round is determined, whether the winner is * foreign or not and how much IO time the round consumed is recorded in * inode->i_wb_frn_history. If the amount of recorded foreign IO time is * over a certain threshold, the switch verdict is given. |
b16b1deb5 writeback: make w... |
558 559 560 |
*/ void wbc_detach_inode(struct writeback_control *wbc) { |
2a8149081 writeback: implem... |
561 562 |
struct bdi_writeback *wb = wbc->wb; struct inode *inode = wbc->inode; |
dd73e4b7d writeback: do for... |
563 564 |
unsigned long avg_time, max_bytes, max_time; u16 history; |
2a8149081 writeback: implem... |
565 |
int max_id; |
dd73e4b7d writeback: do for... |
566 567 568 569 570 |
if (!wb) return; history = inode->i_wb_frn_history; avg_time = inode->i_wb_frn_avg_time; |
2a8149081 writeback: implem... |
571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 |
/* pick the winner of this round */ if (wbc->wb_bytes >= wbc->wb_lcand_bytes && wbc->wb_bytes >= wbc->wb_tcand_bytes) { max_id = wbc->wb_id; max_bytes = wbc->wb_bytes; } else if (wbc->wb_lcand_bytes >= wbc->wb_tcand_bytes) { max_id = wbc->wb_lcand_id; max_bytes = wbc->wb_lcand_bytes; } else { max_id = wbc->wb_tcand_id; max_bytes = wbc->wb_tcand_bytes; } /* * Calculate the amount of IO time the winner consumed and fold it * into the running average kept per inode. If the consumed IO * time is lower than avag / WB_FRN_TIME_CUT_DIV, ignore it for * deciding whether to switch or not. This is to prevent one-off * small dirtiers from skewing the verdict. */ max_time = DIV_ROUND_UP((max_bytes >> PAGE_SHIFT) << WB_FRN_TIME_SHIFT, wb->avg_write_bandwidth); if (avg_time) avg_time += (max_time >> WB_FRN_TIME_AVG_SHIFT) - (avg_time >> WB_FRN_TIME_AVG_SHIFT); else avg_time = max_time; /* immediate catch up on first run */ if (max_time >= avg_time / WB_FRN_TIME_CUT_DIV) { int slots; /* * The switch verdict is reached if foreign wb's consume * more than a certain proportion of IO time in a * WB_FRN_TIME_PERIOD. This is loosely tracked by 16 slot * history mask where each bit represents one sixteenth of * the period. Determine the number of slots to shift into * history from @max_time. */ slots = min(DIV_ROUND_UP(max_time, WB_FRN_HIST_UNIT), (unsigned long)WB_FRN_HIST_MAX_SLOTS); history <<= slots; if (wbc->wb_id != max_id) history |= (1U << slots) - 1; /* * Switch if the current wb isn't the consistent winner. * If there are multiple closely competing dirtiers, the * inode may switch across them repeatedly over time, which * is okay. The main goal is avoiding keeping an inode on * the wrong wb for an extended period of time. */ |
682aa8e1a writeback: implem... |
623 624 |
if (hweight32(history) > WB_FRN_HIST_THR_SLOTS) inode_switch_wbs(inode, max_id); |
2a8149081 writeback: implem... |
625 626 627 628 629 630 631 632 633 |
} /* * Multiple instances of this function may race to update the * following fields but we don't mind occassional inaccuracies. */ inode->i_wb_frn_winner = max_id; inode->i_wb_frn_avg_time = min(avg_time, (unsigned long)U16_MAX); inode->i_wb_frn_history = history; |
b16b1deb5 writeback: make w... |
634 635 636 637 638 |
wb_put(wbc->wb); wbc->wb = NULL; } /** |
2a8149081 writeback: implem... |
639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 |
* wbc_account_io - account IO issued during writeback * @wbc: writeback_control of the writeback in progress * @page: page being written out * @bytes: number of bytes being written out * * @bytes from @page are about to written out during the writeback * controlled by @wbc. Keep the book for foreign inode detection. See * wbc_detach_inode(). */ void wbc_account_io(struct writeback_control *wbc, struct page *page, size_t bytes) { int id; /* * pageout() path doesn't attach @wbc to the inode being written * out. This is intentional as we don't want the function to block * behind a slow cgroup. Ultimately, we want pageout() to kick off * regular writeback instead of writing things out itself. */ if (!wbc->wb) return; |
2a8149081 writeback: implem... |
661 |
id = mem_cgroup_css_from_page(page)->id; |
2a8149081 writeback: implem... |
662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 |
if (id == wbc->wb_id) { wbc->wb_bytes += bytes; return; } if (id == wbc->wb_lcand_id) wbc->wb_lcand_bytes += bytes; /* Boyer-Moore majority vote algorithm */ if (!wbc->wb_tcand_bytes) wbc->wb_tcand_id = id; if (id == wbc->wb_tcand_id) wbc->wb_tcand_bytes += bytes; else wbc->wb_tcand_bytes -= min(bytes, wbc->wb_tcand_bytes); } |
5aa2a96b3 block: export bio... |
679 |
EXPORT_SYMBOL_GPL(wbc_account_io); |
2a8149081 writeback: implem... |
680 681 |
/** |
703c27088 writeback: implem... |
682 |
* inode_congested - test whether an inode is congested |
60292bcc1 writeback: explai... |
683 |
* @inode: inode to test for congestion (may be NULL) |
703c27088 writeback: implem... |
684 685 686 687 688 689 690 691 692 |
* @cong_bits: mask of WB_[a]sync_congested bits to test * * Tests whether @inode is congested. @cong_bits is the mask of congestion * bits to test and the return value is the mask of set bits. * * If cgroup writeback is enabled for @inode, the congestion state is * determined by whether the cgwb (cgroup bdi_writeback) for the blkcg * associated with @inode is congested; otherwise, the root wb's congestion * state is used. |
60292bcc1 writeback: explai... |
693 694 695 |
* * @inode is allowed to be NULL as this function is often called on * mapping->host which is NULL for the swapper space. |
703c27088 writeback: implem... |
696 697 698 |
*/ int inode_congested(struct inode *inode, int cong_bits) { |
5cb8b8241 writeback: use un... |
699 700 701 702 |
/* * Once set, ->i_wb never becomes NULL while the inode is alive. * Start transaction iff ->i_wb is visible. */ |
aaa2cacf8 writeback: add lo... |
703 |
if (inode && inode_to_wb_is_valid(inode)) { |
5cb8b8241 writeback: use un... |
704 705 706 707 708 709 710 |
struct bdi_writeback *wb; bool locked, congested; wb = unlocked_inode_to_wb_begin(inode, &locked); congested = wb_congested(wb, cong_bits); unlocked_inode_to_wb_end(inode, locked); return congested; |
703c27088 writeback: implem... |
711 712 713 714 715 |
} return wb_congested(&inode_to_bdi(inode)->wb, cong_bits); } EXPORT_SYMBOL_GPL(inode_congested); |
f2b651216 writeback: make w... |
716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 |
/** * wb_split_bdi_pages - split nr_pages to write according to bandwidth * @wb: target bdi_writeback to split @nr_pages to * @nr_pages: number of pages to write for the whole bdi * * Split @wb's portion of @nr_pages according to @wb's write bandwidth in * relation to the total write bandwidth of all wb's w/ dirty inodes on * @wb->bdi. */ static long wb_split_bdi_pages(struct bdi_writeback *wb, long nr_pages) { unsigned long this_bw = wb->avg_write_bandwidth; unsigned long tot_bw = atomic_long_read(&wb->bdi->tot_write_bandwidth); if (nr_pages == LONG_MAX) return LONG_MAX; /* * This may be called on clean wb's and proportional distribution * may not make sense, just use the original @nr_pages in those * cases. In general, we wanna err on the side of writing more. */ if (!tot_bw || this_bw >= tot_bw) return nr_pages; else return DIV_ROUND_UP_ULL((u64)nr_pages * this_bw, tot_bw); } |
db1253604 writeback: make w... |
743 |
/** |
db1253604 writeback: make w... |
744 745 746 747 748 749 750 751 752 753 754 755 756 757 |
* bdi_split_work_to_wbs - split a wb_writeback_work to all wb's of a bdi * @bdi: target backing_dev_info * @base_work: wb_writeback_work to issue * @skip_if_busy: skip wb's which already have writeback in progress * * Split and issue @base_work to all wb's (bdi_writeback's) of @bdi which * have dirty inodes. If @base_work->nr_page isn't %LONG_MAX, it's * distributed to the busy wbs according to each wb's proportion in the * total active write bandwidth of @bdi. */ static void bdi_split_work_to_wbs(struct backing_dev_info *bdi, struct wb_writeback_work *base_work, bool skip_if_busy) { |
b817525a4 writeback: bdi_wr... |
758 |
struct bdi_writeback *last_wb = NULL; |
b33e18f61 fs/writeback, rcu... |
759 760 |
struct bdi_writeback *wb = list_entry(&bdi->wb_list, struct bdi_writeback, bdi_node); |
db1253604 writeback: make w... |
761 762 |
might_sleep(); |
db1253604 writeback: make w... |
763 764 |
restart: rcu_read_lock(); |
b817525a4 writeback: bdi_wr... |
765 |
list_for_each_entry_continue_rcu(wb, &bdi->wb_list, bdi_node) { |
8a1270cda writeback: remove... |
766 767 768 769 |
DEFINE_WB_COMPLETION_ONSTACK(fallback_work_done); struct wb_writeback_work fallback_work; struct wb_writeback_work *work; long nr_pages; |
b817525a4 writeback: bdi_wr... |
770 771 772 773 |
if (last_wb) { wb_put(last_wb); last_wb = NULL; } |
006a0973e writeback: sync_i... |
774 775 776 777 778 779 |
/* SYNC_ALL writes out I_DIRTY_TIME too */ if (!wb_has_dirty_io(wb) && (base_work->sync_mode == WB_SYNC_NONE || list_empty(&wb->b_dirty_time))) continue; if (skip_if_busy && writeback_in_progress(wb)) |
db1253604 writeback: make w... |
780 |
continue; |
8a1270cda writeback: remove... |
781 782 783 784 785 786 787 788 789 |
nr_pages = wb_split_bdi_pages(wb, base_work->nr_pages); work = kmalloc(sizeof(*work), GFP_ATOMIC); if (work) { *work = *base_work; work->nr_pages = nr_pages; work->auto_free = 1; wb_queue_work(wb, work); continue; |
db1253604 writeback: make w... |
790 |
} |
8a1270cda writeback: remove... |
791 792 793 794 795 796 797 798 799 |
/* alloc failed, execute synchronously using on-stack fallback */ work = &fallback_work; *work = *base_work; work->nr_pages = nr_pages; work->auto_free = 0; work->done = &fallback_work_done; wb_queue_work(wb, work); |
b817525a4 writeback: bdi_wr... |
800 801 802 803 804 805 806 |
/* * Pin @wb so that it stays on @bdi->wb_list. This allows * continuing iteration from @wb after dropping and * regrabbing rcu read lock. */ wb_get(wb); last_wb = wb; |
8a1270cda writeback: remove... |
807 808 809 |
rcu_read_unlock(); wb_wait_for_completion(bdi, &fallback_work_done); goto restart; |
db1253604 writeback: make w... |
810 811 |
} rcu_read_unlock(); |
b817525a4 writeback: bdi_wr... |
812 813 814 |
if (last_wb) wb_put(last_wb); |
db1253604 writeback: make w... |
815 |
} |
a1a0e23e4 writeback: flush ... |
816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 |
/** * cgroup_writeback_umount - flush inode wb switches for umount * * This function is called when a super_block is about to be destroyed and * flushes in-flight inode wb switches. An inode wb switch goes through * RCU and then workqueue, so the two need to be flushed in order to ensure * that all previously scheduled switches are finished. As wb switches are * rare occurrences and synchronize_rcu() can take a while, perform * flushing iff wb switches are in flight. */ void cgroup_writeback_umount(void) { if (atomic_read(&isw_nr_in_flight)) { synchronize_rcu(); flush_workqueue(isw_wq); } } static int __init cgroup_writeback_init(void) { isw_wq = alloc_workqueue("inode_switch_wbs", 0, 0); if (!isw_wq) return -ENOMEM; return 0; } fs_initcall(cgroup_writeback_init); |
f2b651216 writeback: make w... |
842 |
#else /* CONFIG_CGROUP_WRITEBACK */ |
87e1d789b writeback: implem... |
843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 |
static struct bdi_writeback * locked_inode_to_wb_and_lock_list(struct inode *inode) __releases(&inode->i_lock) __acquires(&wb->list_lock) { struct bdi_writeback *wb = inode_to_wb(inode); spin_unlock(&inode->i_lock); spin_lock(&wb->list_lock); return wb; } static struct bdi_writeback *inode_to_wb_and_lock_list(struct inode *inode) __acquires(&wb->list_lock) { struct bdi_writeback *wb = inode_to_wb(inode); spin_lock(&wb->list_lock); return wb; } |
f2b651216 writeback: make w... |
863 864 865 866 |
static long wb_split_bdi_pages(struct bdi_writeback *wb, long nr_pages) { return nr_pages; } |
db1253604 writeback: make w... |
867 868 869 870 871 |
static void bdi_split_work_to_wbs(struct backing_dev_info *bdi, struct wb_writeback_work *base_work, bool skip_if_busy) { might_sleep(); |
006a0973e writeback: sync_i... |
872 |
if (!skip_if_busy || !writeback_in_progress(&bdi->wb)) { |
db1253604 writeback: make w... |
873 |
base_work->auto_free = 0; |
db1253604 writeback: make w... |
874 875 876 |
wb_queue_work(&bdi->wb, base_work); } } |
703c27088 writeback: implem... |
877 |
#endif /* CONFIG_CGROUP_WRITEBACK */ |
c00ddad39 writeback: remove... |
878 879 |
void wb_start_writeback(struct bdi_writeback *wb, long nr_pages, bool range_cyclic, enum wb_reason reason) |
b6e51316d writeback: separa... |
880 |
{ |
c00ddad39 writeback: remove... |
881 882 883 884 885 886 887 888 889 |
struct wb_writeback_work *work; if (!wb_has_dirty_io(wb)) return; /* * This is WB_SYNC_NONE writeback, so if allocation fails just * wakeup the thread for old dirty data writeback */ |
78ebc2f71 mm,writeback: don... |
890 891 |
work = kzalloc(sizeof(*work), GFP_NOWAIT | __GFP_NOMEMALLOC | __GFP_NOWARN); |
c00ddad39 writeback: remove... |
892 |
if (!work) { |
5634cc2aa writeback: update... |
893 |
trace_writeback_nowork(wb); |
c00ddad39 writeback: remove... |
894 895 896 897 898 899 900 901 |
wb_wakeup(wb); return; } work->sync_mode = WB_SYNC_NONE; work->nr_pages = nr_pages; work->range_cyclic = range_cyclic; work->reason = reason; |
ac7b19a34 writeback: add wb... |
902 |
work->auto_free = 1; |
c00ddad39 writeback: remove... |
903 904 |
wb_queue_work(wb, work); |
c5444198c writeback: simpli... |
905 |
} |
d3ddec763 writeback: stop b... |
906 |
|
c5444198c writeback: simpli... |
907 |
/** |
9ecf4866c writeback: make b... |
908 909 |
* wb_start_background_writeback - start background writeback * @wb: bdi_writback to write from |
c5444198c writeback: simpli... |
910 911 |
* * Description: |
6585027a5 writeback: integr... |
912 |
* This makes sure WB_SYNC_NONE background writeback happens. When |
9ecf4866c writeback: make b... |
913 |
* this function returns, it is only guaranteed that for given wb |
6585027a5 writeback: integr... |
914 915 |
* some IO is happening if we are over background dirty threshold. * Caller need not hold sb s_umount semaphore. |
c5444198c writeback: simpli... |
916 |
*/ |
9ecf4866c writeback: make b... |
917 |
void wb_start_background_writeback(struct bdi_writeback *wb) |
c5444198c writeback: simpli... |
918 |
{ |
6585027a5 writeback: integr... |
919 920 921 922 |
/* * We just wake up the flusher thread. It will perform background * writeback as soon as there is no other work to do. */ |
5634cc2aa writeback: update... |
923 |
trace_writeback_wake_background(wb); |
9ecf4866c writeback: make b... |
924 |
wb_wakeup(wb); |
1da177e4c Linux-2.6.12-rc2 |
925 926 927 |
} /* |
a66979aba fs: move i_wb_lis... |
928 929 |
* Remove the inode from the writeback list it is on. */ |
c7f540849 inode: rename i_w... |
930 |
void inode_io_list_del(struct inode *inode) |
a66979aba fs: move i_wb_lis... |
931 |
{ |
87e1d789b writeback: implem... |
932 |
struct bdi_writeback *wb; |
f758eeabe writeback: split ... |
933 |
|
87e1d789b writeback: implem... |
934 |
wb = inode_to_wb_and_lock_list(inode); |
c7f540849 inode: rename i_w... |
935 |
inode_io_list_del_locked(inode, wb); |
52ebea749 writeback: make b... |
936 |
spin_unlock(&wb->list_lock); |
a66979aba fs: move i_wb_lis... |
937 |
} |
a66979aba fs: move i_wb_lis... |
938 |
/* |
6c60d2b57 fs/fs-writeback.c... |
939 940 941 942 943 944 945 946 947 |
* mark an inode as under writeback on the sb */ void sb_mark_inode_writeback(struct inode *inode) { struct super_block *sb = inode->i_sb; unsigned long flags; if (list_empty(&inode->i_wb_list)) { spin_lock_irqsave(&sb->s_inode_wblist_lock, flags); |
9a46b04f1 fs/fs-writeback.c... |
948 |
if (list_empty(&inode->i_wb_list)) { |
6c60d2b57 fs/fs-writeback.c... |
949 |
list_add_tail(&inode->i_wb_list, &sb->s_inodes_wb); |
9a46b04f1 fs/fs-writeback.c... |
950 951 |
trace_sb_mark_inode_writeback(inode); } |
6c60d2b57 fs/fs-writeback.c... |
952 953 954 955 956 957 958 959 960 961 962 963 964 965 |
spin_unlock_irqrestore(&sb->s_inode_wblist_lock, flags); } } /* * clear an inode as under writeback on the sb */ void sb_clear_inode_writeback(struct inode *inode) { struct super_block *sb = inode->i_sb; unsigned long flags; if (!list_empty(&inode->i_wb_list)) { spin_lock_irqsave(&sb->s_inode_wblist_lock, flags); |
9a46b04f1 fs/fs-writeback.c... |
966 967 968 969 |
if (!list_empty(&inode->i_wb_list)) { list_del_init(&inode->i_wb_list); trace_sb_clear_inode_writeback(inode); } |
6c60d2b57 fs/fs-writeback.c... |
970 971 972 973 974 |
spin_unlock_irqrestore(&sb->s_inode_wblist_lock, flags); } } /* |
6610a0bc8 writeback: fix ti... |
975 976 977 978 |
* Redirty an inode: set its when-it-was dirtied timestamp and move it to the * furthest end of its superblock's dirty-inode list. * * Before stamping the inode's ->dirtied_when, we check to see whether it is |
66f3b8e2e writeback: move d... |
979 |
* already the most-recently-dirtied inode on the b_dirty list. If that is |
6610a0bc8 writeback: fix ti... |
980 981 982 |
* the case then the inode must have been redirtied while it was being written * out and we don't reset its dirtied_when. */ |
f758eeabe writeback: split ... |
983 |
static void redirty_tail(struct inode *inode, struct bdi_writeback *wb) |
6610a0bc8 writeback: fix ti... |
984 |
{ |
03ba3782e writeback: switch... |
985 |
if (!list_empty(&wb->b_dirty)) { |
66f3b8e2e writeback: move d... |
986 |
struct inode *tail; |
6610a0bc8 writeback: fix ti... |
987 |
|
7ccf19a80 fs: inode split I... |
988 |
tail = wb_inode(wb->b_dirty.next); |
66f3b8e2e writeback: move d... |
989 |
if (time_before(inode->dirtied_when, tail->dirtied_when)) |
6610a0bc8 writeback: fix ti... |
990 991 |
inode->dirtied_when = jiffies; } |
c7f540849 inode: rename i_w... |
992 |
inode_io_list_move_locked(inode, wb, &wb->b_dirty); |
6610a0bc8 writeback: fix ti... |
993 994 995 |
} /* |
66f3b8e2e writeback: move d... |
996 |
* requeue inode for re-scanning after bdi->b_io list is exhausted. |
c986d1e2a writeback: fix ti... |
997 |
*/ |
f758eeabe writeback: split ... |
998 |
static void requeue_io(struct inode *inode, struct bdi_writeback *wb) |
c986d1e2a writeback: fix ti... |
999 |
{ |
c7f540849 inode: rename i_w... |
1000 |
inode_io_list_move_locked(inode, wb, &wb->b_more_io); |
c986d1e2a writeback: fix ti... |
1001 |
} |
1c0eeaf56 introduce I_SYNC |
1002 1003 |
static void inode_sync_complete(struct inode *inode) { |
365b94ae6 writeback: Move c... |
1004 |
inode->i_state &= ~I_SYNC; |
4eff96dd5 writeback: put un... |
1005 1006 |
/* If inode is clean an unused, put it into LRU now... */ inode_add_lru(inode); |
365b94ae6 writeback: Move c... |
1007 |
/* Waiters must see I_SYNC cleared before being woken up */ |
1c0eeaf56 introduce I_SYNC |
1008 1009 1010 |
smp_mb(); wake_up_bit(&inode->i_state, __I_SYNC); } |
d2caa3c54 writeback: guard ... |
1011 1012 1013 1014 1015 1016 1017 1018 |
static bool inode_dirtied_after(struct inode *inode, unsigned long t) { bool ret = time_after(inode->dirtied_when, t); #ifndef CONFIG_64BIT /* * For inodes being constantly redirtied, dirtied_when can get stuck. * It _appears_ to be in the future, but is actually in distant past. * This test is necessary to prevent such wrapped-around relative times |
5b0830cb9 writeback: get ri... |
1019 |
* from permanently stopping the whole bdi writeback. |
d2caa3c54 writeback: guard ... |
1020 1021 1022 1023 1024 |
*/ ret = ret && time_before_eq(inode->dirtied_when, jiffies); #endif return ret; } |
0ae45f63d vfs: add support ... |
1025 |
#define EXPIRE_DIRTY_ATIME 0x0001 |
c986d1e2a writeback: fix ti... |
1026 |
/* |
0e2f2b236 writeback: correc... |
1027 |
* Move expired (dirtied before work->older_than_this) dirty inodes from |
697e6fed9 writeback: Remove... |
1028 |
* @delaying_queue to @dispatch_queue. |
2c1365791 writeback: fix ti... |
1029 |
*/ |
e84d0a4f8 writeback: trace ... |
1030 |
static int move_expired_inodes(struct list_head *delaying_queue, |
2c1365791 writeback: fix ti... |
1031 |
struct list_head *dispatch_queue, |
0ae45f63d vfs: add support ... |
1032 |
int flags, |
ad4e38dd6 writeback: send w... |
1033 |
struct wb_writeback_work *work) |
2c1365791 writeback: fix ti... |
1034 |
{ |
0ae45f63d vfs: add support ... |
1035 1036 |
unsigned long *older_than_this = NULL; unsigned long expire_time; |
5c03449d3 writeback: move i... |
1037 1038 |
LIST_HEAD(tmp); struct list_head *pos, *node; |
cf137307c writeback: don't ... |
1039 |
struct super_block *sb = NULL; |
5c03449d3 writeback: move i... |
1040 |
struct inode *inode; |
cf137307c writeback: don't ... |
1041 |
int do_sb_sort = 0; |
e84d0a4f8 writeback: trace ... |
1042 |
int moved = 0; |
5c03449d3 writeback: move i... |
1043 |
|
0ae45f63d vfs: add support ... |
1044 1045 |
if ((flags & EXPIRE_DIRTY_ATIME) == 0) older_than_this = work->older_than_this; |
a2f487069 fs: make sure the... |
1046 1047 |
else if (!work->for_sync) { expire_time = jiffies - (dirtytime_expire_interval * HZ); |
0ae45f63d vfs: add support ... |
1048 1049 |
older_than_this = &expire_time; } |
2c1365791 writeback: fix ti... |
1050 |
while (!list_empty(delaying_queue)) { |
7ccf19a80 fs: inode split I... |
1051 |
inode = wb_inode(delaying_queue->prev); |
0ae45f63d vfs: add support ... |
1052 1053 |
if (older_than_this && inode_dirtied_after(inode, *older_than_this)) |
2c1365791 writeback: fix ti... |
1054 |
break; |
c7f540849 inode: rename i_w... |
1055 |
list_move(&inode->i_io_list, &tmp); |
a8855990e writeback: Do not... |
1056 |
moved++; |
0ae45f63d vfs: add support ... |
1057 1058 |
if (flags & EXPIRE_DIRTY_ATIME) set_bit(__I_DIRTY_TIME_EXPIRED, &inode->i_state); |
a8855990e writeback: Do not... |
1059 1060 |
if (sb_is_blkdev_sb(inode->i_sb)) continue; |
cf137307c writeback: don't ... |
1061 1062 1063 |
if (sb && sb != inode->i_sb) do_sb_sort = 1; sb = inode->i_sb; |
5c03449d3 writeback: move i... |
1064 |
} |
cf137307c writeback: don't ... |
1065 1066 1067 |
/* just one sb in list, splice to dispatch_queue and we're done */ if (!do_sb_sort) { list_splice(&tmp, dispatch_queue); |
e84d0a4f8 writeback: trace ... |
1068 |
goto out; |
cf137307c writeback: don't ... |
1069 |
} |
5c03449d3 writeback: move i... |
1070 1071 |
/* Move inodes from one superblock together */ while (!list_empty(&tmp)) { |
7ccf19a80 fs: inode split I... |
1072 |
sb = wb_inode(tmp.prev)->i_sb; |
5c03449d3 writeback: move i... |
1073 |
list_for_each_prev_safe(pos, node, &tmp) { |
7ccf19a80 fs: inode split I... |
1074 |
inode = wb_inode(pos); |
5c03449d3 writeback: move i... |
1075 |
if (inode->i_sb == sb) |
c7f540849 inode: rename i_w... |
1076 |
list_move(&inode->i_io_list, dispatch_queue); |
5c03449d3 writeback: move i... |
1077 |
} |
2c1365791 writeback: fix ti... |
1078 |
} |
e84d0a4f8 writeback: trace ... |
1079 1080 |
out: return moved; |
2c1365791 writeback: fix ti... |
1081 1082 1083 1084 |
} /* * Queue all expired dirty inodes for io, eldest first. |
4ea879b96 writeback: fix qu... |
1085 1086 1087 1088 1089 1090 1091 1092 |
* Before * newly dirtied b_dirty b_io b_more_io * =============> gf edc BA * After * newly dirtied b_dirty b_io b_more_io * =============> g fBAedc * | * +--> dequeue for IO |
2c1365791 writeback: fix ti... |
1093 |
*/ |
ad4e38dd6 writeback: send w... |
1094 |
static void queue_io(struct bdi_writeback *wb, struct wb_writeback_work *work) |
66f3b8e2e writeback: move d... |
1095 |
{ |
e84d0a4f8 writeback: trace ... |
1096 |
int moved; |
0ae45f63d vfs: add support ... |
1097 |
|
f758eeabe writeback: split ... |
1098 |
assert_spin_locked(&wb->list_lock); |
4ea879b96 writeback: fix qu... |
1099 |
list_splice_init(&wb->b_more_io, &wb->b_io); |
0ae45f63d vfs: add support ... |
1100 1101 1102 |
moved = move_expired_inodes(&wb->b_dirty, &wb->b_io, 0, work); moved += move_expired_inodes(&wb->b_dirty_time, &wb->b_io, EXPIRE_DIRTY_ATIME, work); |
d6c10f1fc writeback: implem... |
1103 1104 |
if (moved) wb_io_lists_populated(wb); |
ad4e38dd6 writeback: send w... |
1105 |
trace_writeback_queue_io(wb, work, moved); |
66f3b8e2e writeback: move d... |
1106 |
} |
a9185b41a pass writeback_co... |
1107 |
static int write_inode(struct inode *inode, struct writeback_control *wbc) |
08d8e9749 writeback: fix nt... |
1108 |
{ |
9fb0a7da0 writeback: add mo... |
1109 1110 1111 1112 1113 1114 1115 1116 |
int ret; if (inode->i_sb->s_op->write_inode && !is_bad_inode(inode)) { trace_writeback_write_inode_start(inode, wbc); ret = inode->i_sb->s_op->write_inode(inode, wbc); trace_writeback_write_inode(inode, wbc); return ret; } |
03ba3782e writeback: switch... |
1117 |
return 0; |
08d8e9749 writeback: fix nt... |
1118 |
} |
08d8e9749 writeback: fix nt... |
1119 |
|
2c1365791 writeback: fix ti... |
1120 |
/* |
169ebd901 writeback: Avoid ... |
1121 1122 |
* Wait for writeback on an inode to complete. Called with i_lock held. * Caller must make sure inode cannot go away when we drop i_lock. |
01c031945 cleanup __writeba... |
1123 |
*/ |
169ebd901 writeback: Avoid ... |
1124 1125 1126 |
static void __inode_wait_for_writeback(struct inode *inode) __releases(inode->i_lock) __acquires(inode->i_lock) |
01c031945 cleanup __writeba... |
1127 1128 1129 1130 1131 |
{ DEFINE_WAIT_BIT(wq, &inode->i_state, __I_SYNC); wait_queue_head_t *wqh; wqh = bit_waitqueue(&inode->i_state, __I_SYNC); |
250df6ed2 fs: protect inode... |
1132 1133 |
while (inode->i_state & I_SYNC) { spin_unlock(&inode->i_lock); |
743162013 sched: Remove pro... |
1134 1135 |
__wait_on_bit(wqh, &wq, bit_wait, TASK_UNINTERRUPTIBLE); |
250df6ed2 fs: protect inode... |
1136 |
spin_lock(&inode->i_lock); |
58a9d3d8d fs-writeback: che... |
1137 |
} |
01c031945 cleanup __writeba... |
1138 1139 1140 |
} /* |
169ebd901 writeback: Avoid ... |
1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 |
* Wait for writeback on an inode to complete. Caller must have inode pinned. */ void inode_wait_for_writeback(struct inode *inode) { spin_lock(&inode->i_lock); __inode_wait_for_writeback(inode); spin_unlock(&inode->i_lock); } /* * Sleep until I_SYNC is cleared. This function must be called with i_lock * held and drops it. It is aimed for callers not holding any inode reference * so once i_lock is dropped, inode can go away. */ static void inode_sleep_on_writeback(struct inode *inode) __releases(inode->i_lock) { DEFINE_WAIT(wait); wait_queue_head_t *wqh = bit_waitqueue(&inode->i_state, __I_SYNC); int sleep; prepare_to_wait(wqh, &wait, TASK_UNINTERRUPTIBLE); sleep = inode->i_state & I_SYNC; spin_unlock(&inode->i_lock); if (sleep) schedule(); finish_wait(wqh, &wait); } /* |
ccb26b5a6 writeback: Separa... |
1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 |
* Find proper writeback list for the inode depending on its current state and * possibly also change of its state while we were doing writeback. Here we * handle things such as livelock prevention or fairness of writeback among * inodes. This function can be called only by flusher thread - noone else * processes all inodes in writeback lists and requeueing inodes behind flusher * thread's back can have unexpected consequences. */ static void requeue_inode(struct inode *inode, struct bdi_writeback *wb, struct writeback_control *wbc) { if (inode->i_state & I_FREEING) return; /* * Sync livelock prevention. Each inode is tagged and synced in one * shot. If still dirty, it will be redirty_tail()'ed below. Update * the dirty time to prevent enqueue and sync it again. */ if ((inode->i_state & I_DIRTY) && (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages)) inode->dirtied_when = jiffies; |
4f8ad655d writeback: Refact... |
1192 1193 1194 1195 1196 1197 1198 1199 |
if (wbc->pages_skipped) { /* * writeback is not making progress due to locked * buffers. Skip this inode for now. */ redirty_tail(inode, wb); return; } |
ccb26b5a6 writeback: Separa... |
1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 |
if (mapping_tagged(inode->i_mapping, PAGECACHE_TAG_DIRTY)) { /* * We didn't write back all the pages. nfs_writepages() * sometimes bales out without doing anything. */ if (wbc->nr_to_write <= 0) { /* Slice used up. Queue for next turn. */ requeue_io(inode, wb); } else { /* * Writeback blocked by something other than * congestion. Delay the inode for some time to * avoid spinning on the CPU (100% iowait) * retrying writeback of the dirty page/inode * that cannot be performed immediately. */ redirty_tail(inode, wb); } } else if (inode->i_state & I_DIRTY) { /* * Filesystems can dirty the inode during writeback operations, * such as delayed allocation during submission or metadata * updates after data IO completion. */ redirty_tail(inode, wb); |
0ae45f63d vfs: add support ... |
1225 |
} else if (inode->i_state & I_DIRTY_TIME) { |
a2f487069 fs: make sure the... |
1226 |
inode->dirtied_when = jiffies; |
c7f540849 inode: rename i_w... |
1227 |
inode_io_list_move_locked(inode, wb, &wb->b_dirty_time); |
ccb26b5a6 writeback: Separa... |
1228 1229 |
} else { /* The inode is clean. Remove from writeback lists. */ |
c7f540849 inode: rename i_w... |
1230 |
inode_io_list_del_locked(inode, wb); |
ccb26b5a6 writeback: Separa... |
1231 1232 1233 1234 |
} } /* |
4f8ad655d writeback: Refact... |
1235 1236 1237 |
* Write out an inode and its dirty pages. Do not update the writeback list * linkage. That is left to the caller. The caller is also responsible for * setting I_SYNC flag and calling inode_sync_complete() to clear it. |
1da177e4c Linux-2.6.12-rc2 |
1238 1239 |
*/ static int |
cd8ed2a45 fs/fs-writeback.c... |
1240 |
__writeback_single_inode(struct inode *inode, struct writeback_control *wbc) |
1da177e4c Linux-2.6.12-rc2 |
1241 |
{ |
1da177e4c Linux-2.6.12-rc2 |
1242 |
struct address_space *mapping = inode->i_mapping; |
251d6a471 writeback: trace ... |
1243 |
long nr_to_write = wbc->nr_to_write; |
01c031945 cleanup __writeba... |
1244 |
unsigned dirty; |
1da177e4c Linux-2.6.12-rc2 |
1245 |
int ret; |
4f8ad655d writeback: Refact... |
1246 |
WARN_ON(!(inode->i_state & I_SYNC)); |
1da177e4c Linux-2.6.12-rc2 |
1247 |
|
9fb0a7da0 writeback: add mo... |
1248 |
trace_writeback_single_inode_start(inode, wbc, nr_to_write); |
1da177e4c Linux-2.6.12-rc2 |
1249 |
ret = do_writepages(mapping, wbc); |
26821ed40 make sure data is... |
1250 1251 1252 |
/* * Make sure to wait on the data before writing out the metadata. * This is important for filesystems that modify metadata on data |
7747bd4bc sync: don't block... |
1253 1254 1255 |
* I/O completion. We don't do it for sync(2) writeback because it has a * separate, external IO completion path and ->sync_fs for guaranteeing * inode metadata is written back correctly. |
26821ed40 make sure data is... |
1256 |
*/ |
7747bd4bc sync: don't block... |
1257 |
if (wbc->sync_mode == WB_SYNC_ALL && !wbc->for_sync) { |
26821ed40 make sure data is... |
1258 |
int err = filemap_fdatawait(mapping); |
1da177e4c Linux-2.6.12-rc2 |
1259 1260 1261 |
if (ret == 0) ret = err; } |
5547e8aac writeback: Update... |
1262 1263 1264 1265 1266 |
/* * Some filesystems may redirty the inode during the writeback * due to delalloc, clear dirty metadata flags right before * write_inode() */ |
250df6ed2 fs: protect inode... |
1267 |
spin_lock(&inode->i_lock); |
9c6ac78eb writeback: fix a ... |
1268 |
|
5547e8aac writeback: Update... |
1269 |
dirty = inode->i_state & I_DIRTY; |
a2f487069 fs: make sure the... |
1270 1271 |
if (inode->i_state & I_DIRTY_TIME) { if ((dirty & (I_DIRTY_SYNC | I_DIRTY_DATASYNC)) || |
dc5ff2b1d writeback: Write ... |
1272 |
wbc->sync_mode == WB_SYNC_ALL || |
a2f487069 fs: make sure the... |
1273 1274 1275 1276 1277 1278 1279 1280 1281 |
unlikely(inode->i_state & I_DIRTY_TIME_EXPIRED) || unlikely(time_after(jiffies, (inode->dirtied_time_when + dirtytime_expire_interval * HZ)))) { dirty |= I_DIRTY_TIME | I_DIRTY_TIME_EXPIRED; trace_writeback_lazytime(inode); } } else inode->i_state &= ~I_DIRTY_TIME_EXPIRED; |
0ae45f63d vfs: add support ... |
1282 |
inode->i_state &= ~dirty; |
9c6ac78eb writeback: fix a ... |
1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 |
/* * Paired with smp_mb() in __mark_inode_dirty(). This allows * __mark_inode_dirty() to test i_state without grabbing i_lock - * either they see the I_DIRTY bits cleared or we see the dirtied * inode. * * I_DIRTY_PAGES is always cleared together above even if @mapping * still has dirty pages. The flag is reinstated after smp_mb() if * necessary. This guarantees that either __mark_inode_dirty() * sees clear I_DIRTY_PAGES or we see PAGECACHE_TAG_DIRTY. */ smp_mb(); if (mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) inode->i_state |= I_DIRTY_PAGES; |
250df6ed2 fs: protect inode... |
1299 |
spin_unlock(&inode->i_lock); |
9c6ac78eb writeback: fix a ... |
1300 |
|
0ae45f63d vfs: add support ... |
1301 1302 |
if (dirty & I_DIRTY_TIME) mark_inode_dirty_sync(inode); |
26821ed40 make sure data is... |
1303 |
/* Don't write the inode if only I_DIRTY_PAGES was set */ |
0ae45f63d vfs: add support ... |
1304 |
if (dirty & ~I_DIRTY_PAGES) { |
a9185b41a pass writeback_co... |
1305 |
int err = write_inode(inode, wbc); |
1da177e4c Linux-2.6.12-rc2 |
1306 1307 1308 |
if (ret == 0) ret = err; } |
4f8ad655d writeback: Refact... |
1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 |
trace_writeback_single_inode(inode, wbc, nr_to_write); return ret; } /* * Write out an inode's dirty pages. Either the caller has an active reference * on the inode or the inode has I_WILL_FREE set. * * This function is designed to be called for writing back one inode which * we go e.g. from filesystem. Flusher thread uses __writeback_single_inode() * and does more profound writeback list handling in writeback_sb_inodes(). */ |
aaf255933 writeback, cgroup... |
1321 1322 |
static int writeback_single_inode(struct inode *inode, struct writeback_control *wbc) |
4f8ad655d writeback: Refact... |
1323 |
{ |
aaf255933 writeback, cgroup... |
1324 |
struct bdi_writeback *wb; |
4f8ad655d writeback: Refact... |
1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 |
int ret = 0; spin_lock(&inode->i_lock); if (!atomic_read(&inode->i_count)) WARN_ON(!(inode->i_state & (I_WILL_FREE|I_FREEING))); else WARN_ON(inode->i_state & I_WILL_FREE); if (inode->i_state & I_SYNC) { if (wbc->sync_mode != WB_SYNC_ALL) goto out; /* |
169ebd901 writeback: Avoid ... |
1337 1338 1339 |
* It's a data-integrity sync. We must wait. Since callers hold * inode reference or inode has I_WILL_FREE set, it cannot go * away under us. |
4f8ad655d writeback: Refact... |
1340 |
*/ |
169ebd901 writeback: Avoid ... |
1341 |
__inode_wait_for_writeback(inode); |
4f8ad655d writeback: Refact... |
1342 1343 1344 |
} WARN_ON(inode->i_state & I_SYNC); /* |
f9b0e058c writeback: Fix da... |
1345 1346 1347 1348 1349 1350 |
* Skip inode if it is clean and we have no outstanding writeback in * WB_SYNC_ALL mode. We don't want to mess with writeback lists in this * function since flusher thread may be doing for example sync in * parallel and if we move the inode, it could get skipped. So here we * make sure inode is on some writeback list and leave it there unless * we have completely cleaned the inode. |
4f8ad655d writeback: Refact... |
1351 |
*/ |
0ae45f63d vfs: add support ... |
1352 |
if (!(inode->i_state & I_DIRTY_ALL) && |
f9b0e058c writeback: Fix da... |
1353 1354 |
(wbc->sync_mode != WB_SYNC_ALL || !mapping_tagged(inode->i_mapping, PAGECACHE_TAG_WRITEBACK))) |
4f8ad655d writeback: Refact... |
1355 1356 |
goto out; inode->i_state |= I_SYNC; |
b16b1deb5 writeback: make w... |
1357 |
wbc_attach_and_unlock_inode(wbc, inode); |
4f8ad655d writeback: Refact... |
1358 |
|
cd8ed2a45 fs/fs-writeback.c... |
1359 |
ret = __writeback_single_inode(inode, wbc); |
1da177e4c Linux-2.6.12-rc2 |
1360 |
|
b16b1deb5 writeback: make w... |
1361 |
wbc_detach_inode(wbc); |
aaf255933 writeback, cgroup... |
1362 1363 |
wb = inode_to_wb_and_lock_list(inode); |
250df6ed2 fs: protect inode... |
1364 |
spin_lock(&inode->i_lock); |
4f8ad655d writeback: Refact... |
1365 1366 1367 1368 |
/* * If inode is clean, remove it from writeback lists. Otherwise don't * touch it. See comment above for explanation. */ |
0ae45f63d vfs: add support ... |
1369 |
if (!(inode->i_state & I_DIRTY_ALL)) |
c7f540849 inode: rename i_w... |
1370 |
inode_io_list_del_locked(inode, wb); |
4f8ad655d writeback: Refact... |
1371 |
spin_unlock(&wb->list_lock); |
1c0eeaf56 introduce I_SYNC |
1372 |
inode_sync_complete(inode); |
4f8ad655d writeback: Refact... |
1373 1374 |
out: spin_unlock(&inode->i_lock); |
1da177e4c Linux-2.6.12-rc2 |
1375 1376 |
return ret; } |
a88a341a7 writeback: move b... |
1377 |
static long writeback_chunk_size(struct bdi_writeback *wb, |
1a12d8bd7 writeback: scale ... |
1378 |
struct wb_writeback_work *work) |
d46db3d58 writeback: make w... |
1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 |
{ long pages; /* * WB_SYNC_ALL mode does livelock avoidance by syncing dirty * inodes/pages in one big loop. Setting wbc.nr_to_write=LONG_MAX * here avoids calling into writeback_inodes_wb() more than once. * * The intended call sequence for WB_SYNC_ALL writeback is: * * wb_writeback() * writeback_sb_inodes() <== called only once * write_cache_pages() <== called once for each inode * (quickly) tag currently dirty pages * (maybe slowly) sync all tagged pages */ if (work->sync_mode == WB_SYNC_ALL || work->tagged_writepages) pages = LONG_MAX; |
1a12d8bd7 writeback: scale ... |
1397 |
else { |
a88a341a7 writeback: move b... |
1398 |
pages = min(wb->avg_write_bandwidth / 2, |
dcc25ae76 writeback: move g... |
1399 |
global_wb_domain.dirty_limit / DIRTY_SCOPE); |
1a12d8bd7 writeback: scale ... |
1400 1401 1402 1403 |
pages = min(pages, work->nr_pages); pages = round_down(pages + MIN_WRITEBACK_PAGES, MIN_WRITEBACK_PAGES); } |
d46db3d58 writeback: make w... |
1404 1405 1406 |
return pages; } |
03ba3782e writeback: switch... |
1407 |
/* |
f11c9c5c2 vfs: improve writ... |
1408 |
* Write a portion of b_io inodes which belong to @sb. |
edadfb10b writeback: split ... |
1409 |
* |
d46db3d58 writeback: make w... |
1410 |
* Return the number of pages and/or inodes written. |
0ba13fd19 Revert "writeback... |
1411 1412 1413 1414 |
* * NOTE! This is called with wb->list_lock held, and will * unlock and relock that for each inode it ends up doing * IO for. |
f11c9c5c2 vfs: improve writ... |
1415 |
*/ |
d46db3d58 writeback: make w... |
1416 1417 1418 |
static long writeback_sb_inodes(struct super_block *sb, struct bdi_writeback *wb, struct wb_writeback_work *work) |
1da177e4c Linux-2.6.12-rc2 |
1419 |
{ |
d46db3d58 writeback: make w... |
1420 1421 1422 1423 1424 |
struct writeback_control wbc = { .sync_mode = work->sync_mode, .tagged_writepages = work->tagged_writepages, .for_kupdate = work->for_kupdate, .for_background = work->for_background, |
7747bd4bc sync: don't block... |
1425 |
.for_sync = work->for_sync, |
d46db3d58 writeback: make w... |
1426 1427 1428 1429 1430 1431 1432 |
.range_cyclic = work->range_cyclic, .range_start = 0, .range_end = LLONG_MAX, }; unsigned long start_time = jiffies; long write_chunk; long wrote = 0; /* count both pages and inodes */ |
03ba3782e writeback: switch... |
1433 |
while (!list_empty(&wb->b_io)) { |
7ccf19a80 fs: inode split I... |
1434 |
struct inode *inode = wb_inode(wb->b_io.prev); |
aaf255933 writeback, cgroup... |
1435 |
struct bdi_writeback *tmp_wb; |
edadfb10b writeback: split ... |
1436 1437 |
if (inode->i_sb != sb) { |
d46db3d58 writeback: make w... |
1438 |
if (work->sb) { |
edadfb10b writeback: split ... |
1439 1440 1441 1442 1443 |
/* * We only want to write back data for this * superblock, move all inodes not belonging * to it back onto the dirty list. */ |
f758eeabe writeback: split ... |
1444 |
redirty_tail(inode, wb); |
edadfb10b writeback: split ... |
1445 1446 1447 1448 1449 1450 1451 1452 |
continue; } /* * The inode belongs to a different superblock. * Bounce back to the caller to unpin this and * pin the next superblock. */ |
d46db3d58 writeback: make w... |
1453 |
break; |
edadfb10b writeback: split ... |
1454 |
} |
9843b76aa fs: skip I_FREEIN... |
1455 |
/* |
331cbdeed writeback: Fix so... |
1456 1457 |
* Don't bother with new inodes or inodes being freed, first * kind does not need periodic writeout yet, and for the latter |
9843b76aa fs: skip I_FREEIN... |
1458 1459 |
* kind writeout is handled by the freer. */ |
250df6ed2 fs: protect inode... |
1460 |
spin_lock(&inode->i_lock); |
9843b76aa fs: skip I_FREEIN... |
1461 |
if (inode->i_state & (I_NEW | I_FREEING | I_WILL_FREE)) { |
250df6ed2 fs: protect inode... |
1462 |
spin_unlock(&inode->i_lock); |
fcc5c2221 writeback: don't ... |
1463 |
redirty_tail(inode, wb); |
7ef0d7377 fs: new inode i_s... |
1464 1465 |
continue; } |
cc1676d91 writeback: Move r... |
1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 |
if ((inode->i_state & I_SYNC) && wbc.sync_mode != WB_SYNC_ALL) { /* * If this inode is locked for writeback and we are not * doing writeback-for-data-integrity, move it to * b_more_io so that writeback can proceed with the * other inodes on s_io. * * We'll have another go at writing back this inode * when we completed a full scan of b_io. */ spin_unlock(&inode->i_lock); requeue_io(inode, wb); trace_writeback_sb_inodes_requeue(inode); continue; } |
f0d07b7ff writeback: Remove... |
1481 |
spin_unlock(&wb->list_lock); |
4f8ad655d writeback: Refact... |
1482 1483 1484 1485 1486 |
/* * We already requeued the inode if it had I_SYNC set and we * are doing WB_SYNC_NONE writeback. So this catches only the * WB_SYNC_ALL case. */ |
169ebd901 writeback: Avoid ... |
1487 1488 1489 1490 |
if (inode->i_state & I_SYNC) { /* Wait for I_SYNC. This function drops i_lock... */ inode_sleep_on_writeback(inode); /* Inode may be gone, start again */ |
ead188f9f writeback: Fix lo... |
1491 |
spin_lock(&wb->list_lock); |
169ebd901 writeback: Avoid ... |
1492 1493 |
continue; } |
4f8ad655d writeback: Refact... |
1494 |
inode->i_state |= I_SYNC; |
b16b1deb5 writeback: make w... |
1495 |
wbc_attach_and_unlock_inode(&wbc, inode); |
169ebd901 writeback: Avoid ... |
1496 |
|
a88a341a7 writeback: move b... |
1497 |
write_chunk = writeback_chunk_size(wb, work); |
d46db3d58 writeback: make w... |
1498 1499 |
wbc.nr_to_write = write_chunk; wbc.pages_skipped = 0; |
250df6ed2 fs: protect inode... |
1500 |
|
169ebd901 writeback: Avoid ... |
1501 1502 1503 1504 |
/* * We use I_SYNC to pin the inode in memory. While it is set * evict_inode() will wait so the inode cannot be freed. */ |
cd8ed2a45 fs/fs-writeback.c... |
1505 |
__writeback_single_inode(inode, &wbc); |
250df6ed2 fs: protect inode... |
1506 |
|
b16b1deb5 writeback: make w... |
1507 |
wbc_detach_inode(&wbc); |
d46db3d58 writeback: make w... |
1508 1509 |
work->nr_pages -= write_chunk - wbc.nr_to_write; wrote += write_chunk - wbc.nr_to_write; |
590dca3a7 fs-writeback: unp... |
1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 |
if (need_resched()) { /* * We're trying to balance between building up a nice * long list of IOs to improve our merge rate, and * getting those IOs out quickly for anyone throttling * in balance_dirty_pages(). cond_resched() doesn't * unplug, so get our IOs out the door before we * give up the CPU. */ blk_flush_plug(current); cond_resched(); } |
aaf255933 writeback, cgroup... |
1523 1524 1525 1526 1527 |
/* * Requeue @inode if still dirty. Be careful as @inode may * have been switched to another wb in the meantime. */ tmp_wb = inode_to_wb_and_lock_list(inode); |
4f8ad655d writeback: Refact... |
1528 |
spin_lock(&inode->i_lock); |
0ae45f63d vfs: add support ... |
1529 |
if (!(inode->i_state & I_DIRTY_ALL)) |
d46db3d58 writeback: make w... |
1530 |
wrote++; |
aaf255933 writeback, cgroup... |
1531 |
requeue_inode(inode, tmp_wb, &wbc); |
4f8ad655d writeback: Refact... |
1532 |
inode_sync_complete(inode); |
0f1b1fd86 fs: pull inode->i... |
1533 |
spin_unlock(&inode->i_lock); |
590dca3a7 fs-writeback: unp... |
1534 |
|
aaf255933 writeback, cgroup... |
1535 1536 1537 1538 |
if (unlikely(tmp_wb != wb)) { spin_unlock(&tmp_wb->list_lock); spin_lock(&wb->list_lock); } |
d46db3d58 writeback: make w... |
1539 1540 1541 1542 1543 1544 1545 1546 1547 |
/* * bail out to wb_writeback() often enough to check * background threshold and other termination conditions. */ if (wrote) { if (time_is_before_jiffies(start_time + HZ / 10UL)) break; if (work->nr_pages <= 0) break; |
8bc3be275 writeback: speed ... |
1548 |
} |
1da177e4c Linux-2.6.12-rc2 |
1549 |
} |
d46db3d58 writeback: make w... |
1550 |
return wrote; |
f11c9c5c2 vfs: improve writ... |
1551 |
} |
d46db3d58 writeback: make w... |
1552 1553 |
static long __writeback_inodes_wb(struct bdi_writeback *wb, struct wb_writeback_work *work) |
f11c9c5c2 vfs: improve writ... |
1554 |
{ |
d46db3d58 writeback: make w... |
1555 1556 |
unsigned long start_time = jiffies; long wrote = 0; |
38f219776 fs: sync_sb_inode... |
1557 |
|
f11c9c5c2 vfs: improve writ... |
1558 |
while (!list_empty(&wb->b_io)) { |
7ccf19a80 fs: inode split I... |
1559 |
struct inode *inode = wb_inode(wb->b_io.prev); |
f11c9c5c2 vfs: improve writ... |
1560 |
struct super_block *sb = inode->i_sb; |
9ecc2738a writeback: make t... |
1561 |
|
eb6ef3df4 trylock_super(): ... |
1562 |
if (!trylock_super(sb)) { |
0e995816f don't busy retry ... |
1563 |
/* |
eb6ef3df4 trylock_super(): ... |
1564 |
* trylock_super() may fail consistently due to |
0e995816f don't busy retry ... |
1565 1566 1567 1568 |
* s_umount being grabbed by someone else. Don't use * requeue_io() to avoid busy retrying the inode/sb. */ redirty_tail(inode, wb); |
edadfb10b writeback: split ... |
1569 |
continue; |
f11c9c5c2 vfs: improve writ... |
1570 |
} |
d46db3d58 writeback: make w... |
1571 |
wrote += writeback_sb_inodes(sb, wb, work); |
eb6ef3df4 trylock_super(): ... |
1572 |
up_read(&sb->s_umount); |
f11c9c5c2 vfs: improve writ... |
1573 |
|
d46db3d58 writeback: make w... |
1574 1575 1576 1577 1578 1579 1580 |
/* refer to the same tests at the end of writeback_sb_inodes */ if (wrote) { if (time_is_before_jiffies(start_time + HZ / 10UL)) break; if (work->nr_pages <= 0) break; } |
f11c9c5c2 vfs: improve writ... |
1581 |
} |
66f3b8e2e writeback: move d... |
1582 |
/* Leave any unwritten inodes on b_io */ |
d46db3d58 writeback: make w... |
1583 |
return wrote; |
66f3b8e2e writeback: move d... |
1584 |
} |
7d9f073b8 mm/writeback: mak... |
1585 |
static long writeback_inodes_wb(struct bdi_writeback *wb, long nr_pages, |
0e175a183 writeback: Add a ... |
1586 |
enum wb_reason reason) |
edadfb10b writeback: split ... |
1587 |
{ |
d46db3d58 writeback: make w... |
1588 1589 1590 1591 |
struct wb_writeback_work work = { .nr_pages = nr_pages, .sync_mode = WB_SYNC_NONE, .range_cyclic = 1, |
0e175a183 writeback: Add a ... |
1592 |
.reason = reason, |
d46db3d58 writeback: make w... |
1593 |
}; |
505a666ee writeback: plug w... |
1594 |
struct blk_plug plug; |
edadfb10b writeback: split ... |
1595 |
|
505a666ee writeback: plug w... |
1596 |
blk_start_plug(&plug); |
f758eeabe writeback: split ... |
1597 |
spin_lock(&wb->list_lock); |
424b351fe writeback: refill... |
1598 |
if (list_empty(&wb->b_io)) |
ad4e38dd6 writeback: send w... |
1599 |
queue_io(wb, &work); |
d46db3d58 writeback: make w... |
1600 |
__writeback_inodes_wb(wb, &work); |
f758eeabe writeback: split ... |
1601 |
spin_unlock(&wb->list_lock); |
505a666ee writeback: plug w... |
1602 |
blk_finish_plug(&plug); |
edadfb10b writeback: split ... |
1603 |
|
d46db3d58 writeback: make w... |
1604 1605 |
return nr_pages - work.nr_pages; } |
03ba3782e writeback: switch... |
1606 |
|
03ba3782e writeback: switch... |
1607 1608 |
/* * Explicit flushing or periodic writeback of "old" data. |
66f3b8e2e writeback: move d... |
1609 |
* |
03ba3782e writeback: switch... |
1610 1611 1612 1613 |
* Define "old": the first time one of an inode's pages is dirtied, we mark the * dirtying-time in the inode's address_space. So this periodic writeback code * just walks the superblock inode list, writing back any inodes which are * older than a specific point in time. |
66f3b8e2e writeback: move d... |
1614 |
* |
03ba3782e writeback: switch... |
1615 1616 1617 |
* Try to run once per dirty_writeback_interval. But if a writeback event * takes longer than a dirty_writeback_interval interval, then leave a * one-second gap. |
66f3b8e2e writeback: move d... |
1618 |
* |
03ba3782e writeback: switch... |
1619 1620 |
* older_than_this takes precedence over nr_to_write. So we'll only write back * all dirty pages if they are all attached to "old" mappings. |
66f3b8e2e writeback: move d... |
1621 |
*/ |
c4a77a6c7 writeback: make w... |
1622 |
static long wb_writeback(struct bdi_writeback *wb, |
83ba7b071 writeback: simpli... |
1623 |
struct wb_writeback_work *work) |
66f3b8e2e writeback: move d... |
1624 |
{ |
e98be2d59 writeback: bdi wr... |
1625 |
unsigned long wb_start = jiffies; |
d46db3d58 writeback: make w... |
1626 |
long nr_pages = work->nr_pages; |
0dc83bd30 Revert "writeback... |
1627 |
unsigned long oldest_jif; |
a5989bdc9 fs: Fix busyloop ... |
1628 |
struct inode *inode; |
d46db3d58 writeback: make w... |
1629 |
long progress; |
505a666ee writeback: plug w... |
1630 |
struct blk_plug plug; |
66f3b8e2e writeback: move d... |
1631 |
|
0dc83bd30 Revert "writeback... |
1632 1633 |
oldest_jif = jiffies; work->older_than_this = &oldest_jif; |
38f219776 fs: sync_sb_inode... |
1634 |
|
505a666ee writeback: plug w... |
1635 |
blk_start_plug(&plug); |
e8dfc3058 writeback: elevat... |
1636 |
spin_lock(&wb->list_lock); |
03ba3782e writeback: switch... |
1637 1638 |
for (;;) { /* |
d3ddec763 writeback: stop b... |
1639 |
* Stop writeback when nr_pages has been consumed |
03ba3782e writeback: switch... |
1640 |
*/ |
83ba7b071 writeback: simpli... |
1641 |
if (work->nr_pages <= 0) |
03ba3782e writeback: switch... |
1642 |
break; |
66f3b8e2e writeback: move d... |
1643 |
|
38f219776 fs: sync_sb_inode... |
1644 |
/* |
aa373cf55 writeback: stop b... |
1645 1646 1647 1648 1649 1650 |
* Background writeout and kupdate-style writeback may * run forever. Stop them if there is other work to do * so that e.g. sync can proceed. They'll be restarted * after the other works are all done. */ if ((work->for_background || work->for_kupdate) && |
f0054bb1e writeback: move b... |
1651 |
!list_empty(&wb->work_list)) |
aa373cf55 writeback: stop b... |
1652 1653 1654 |
break; /* |
d3ddec763 writeback: stop b... |
1655 1656 |
* For background writeout, stop when we are below the * background dirty threshold |
38f219776 fs: sync_sb_inode... |
1657 |
*/ |
aa661bbe1 writeback: move o... |
1658 |
if (work->for_background && !wb_over_bg_thresh(wb)) |
03ba3782e writeback: switch... |
1659 |
break; |
38f219776 fs: sync_sb_inode... |
1660 |
|
1bc36b642 writeback: Includ... |
1661 1662 1663 1664 1665 1666 |
/* * Kupdate and background works are special and we want to * include all inodes that need writing. Livelock avoidance is * handled by these works yielding to any other work so we are * safe. */ |
ba9aa8399 writeback: the ku... |
1667 |
if (work->for_kupdate) { |
0dc83bd30 Revert "writeback... |
1668 |
oldest_jif = jiffies - |
ba9aa8399 writeback: the ku... |
1669 |
msecs_to_jiffies(dirty_expire_interval * 10); |
1bc36b642 writeback: Includ... |
1670 |
} else if (work->for_background) |
0dc83bd30 Revert "writeback... |
1671 |
oldest_jif = jiffies; |
028c2dd18 writeback: Add tr... |
1672 |
|
5634cc2aa writeback: update... |
1673 |
trace_writeback_start(wb, work); |
e8dfc3058 writeback: elevat... |
1674 |
if (list_empty(&wb->b_io)) |
ad4e38dd6 writeback: send w... |
1675 |
queue_io(wb, work); |
83ba7b071 writeback: simpli... |
1676 |
if (work->sb) |
d46db3d58 writeback: make w... |
1677 |
progress = writeback_sb_inodes(work->sb, wb, work); |
edadfb10b writeback: split ... |
1678 |
else |
d46db3d58 writeback: make w... |
1679 |
progress = __writeback_inodes_wb(wb, work); |
5634cc2aa writeback: update... |
1680 |
trace_writeback_written(wb, work); |
028c2dd18 writeback: Add tr... |
1681 |
|
e98be2d59 writeback: bdi wr... |
1682 |
wb_update_bandwidth(wb, wb_start); |
03ba3782e writeback: switch... |
1683 1684 |
/* |
e6fb6da2e writeback: try mo... |
1685 1686 1687 1688 1689 1690 |
* Did we write something? Try for more * * Dirty inodes are moved to b_io for writeback in batches. * The completion of the current batch does not necessarily * mean the overall work is done. So we keep looping as long * as made some progress on cleaning pages or inodes. |
03ba3782e writeback: switch... |
1691 |
*/ |
d46db3d58 writeback: make w... |
1692 |
if (progress) |
71fd05a88 writeback: improv... |
1693 1694 |
continue; /* |
e6fb6da2e writeback: try mo... |
1695 |
* No more inodes for IO, bail |
71fd05a88 writeback: improv... |
1696 |
*/ |
b7a2441f9 writeback: remove... |
1697 |
if (list_empty(&wb->b_more_io)) |
03ba3782e writeback: switch... |
1698 |
break; |
71fd05a88 writeback: improv... |
1699 |
/* |
71fd05a88 writeback: improv... |
1700 1701 1702 1703 |
* Nothing written. Wait for some inode to * become available for writeback. Otherwise * we'll just busyloop. */ |
71fd05a88 writeback: improv... |
1704 |
if (!list_empty(&wb->b_more_io)) { |
5634cc2aa writeback: update... |
1705 |
trace_writeback_wait(wb, work); |
7ccf19a80 fs: inode split I... |
1706 |
inode = wb_inode(wb->b_more_io.prev); |
250df6ed2 fs: protect inode... |
1707 |
spin_lock(&inode->i_lock); |
f0d07b7ff writeback: Remove... |
1708 |
spin_unlock(&wb->list_lock); |
169ebd901 writeback: Avoid ... |
1709 1710 |
/* This function drops i_lock... */ inode_sleep_on_writeback(inode); |
f0d07b7ff writeback: Remove... |
1711 |
spin_lock(&wb->list_lock); |
03ba3782e writeback: switch... |
1712 1713 |
} } |
e8dfc3058 writeback: elevat... |
1714 |
spin_unlock(&wb->list_lock); |
505a666ee writeback: plug w... |
1715 |
blk_finish_plug(&plug); |
03ba3782e writeback: switch... |
1716 |
|
d46db3d58 writeback: make w... |
1717 |
return nr_pages - work->nr_pages; |
03ba3782e writeback: switch... |
1718 1719 1720 |
} /* |
83ba7b071 writeback: simpli... |
1721 |
* Return the next wb_writeback_work struct that hasn't been processed yet. |
03ba3782e writeback: switch... |
1722 |
*/ |
f0054bb1e writeback: move b... |
1723 |
static struct wb_writeback_work *get_next_work_item(struct bdi_writeback *wb) |
03ba3782e writeback: switch... |
1724 |
{ |
83ba7b071 writeback: simpli... |
1725 |
struct wb_writeback_work *work = NULL; |
03ba3782e writeback: switch... |
1726 |
|
f0054bb1e writeback: move b... |
1727 1728 1729 |
spin_lock_bh(&wb->work_lock); if (!list_empty(&wb->work_list)) { work = list_entry(wb->work_list.next, |
83ba7b071 writeback: simpli... |
1730 1731 |
struct wb_writeback_work, list); list_del_init(&work->list); |
03ba3782e writeback: switch... |
1732 |
} |
f0054bb1e writeback: move b... |
1733 |
spin_unlock_bh(&wb->work_lock); |
83ba7b071 writeback: simpli... |
1734 |
return work; |
03ba3782e writeback: switch... |
1735 |
} |
cdf01dd54 fs-writeback.c: u... |
1736 1737 1738 1739 1740 1741 |
/* * Add in the number of potentially dirty inodes, because each inode * write can dirty pagecache in the underlying blockdev. */ static unsigned long get_nr_dirty_pages(void) { |
11fb99898 mm: move most fil... |
1742 1743 |
return global_node_page_state(NR_FILE_DIRTY) + global_node_page_state(NR_UNSTABLE_NFS) + |
cdf01dd54 fs-writeback.c: u... |
1744 1745 |
get_nr_dirty_inodes(); } |
6585027a5 writeback: integr... |
1746 1747 |
static long wb_check_background_flush(struct bdi_writeback *wb) { |
aa661bbe1 writeback: move o... |
1748 |
if (wb_over_bg_thresh(wb)) { |
6585027a5 writeback: integr... |
1749 1750 1751 1752 1753 1754 |
struct wb_writeback_work work = { .nr_pages = LONG_MAX, .sync_mode = WB_SYNC_NONE, .for_background = 1, .range_cyclic = 1, |
0e175a183 writeback: Add a ... |
1755 |
.reason = WB_REASON_BACKGROUND, |
6585027a5 writeback: integr... |
1756 1757 1758 1759 1760 1761 1762 |
}; return wb_writeback(wb, &work); } return 0; } |
03ba3782e writeback: switch... |
1763 1764 1765 1766 |
static long wb_check_old_data_flush(struct bdi_writeback *wb) { unsigned long expired; long nr_pages; |
69b62d01e writeback: disabl... |
1767 1768 1769 1770 1771 |
/* * When set to zero, disable periodic writeback */ if (!dirty_writeback_interval) return 0; |
03ba3782e writeback: switch... |
1772 1773 1774 1775 1776 1777 |
expired = wb->last_old_flush + msecs_to_jiffies(dirty_writeback_interval * 10); if (time_before(jiffies, expired)) return 0; wb->last_old_flush = jiffies; |
cdf01dd54 fs-writeback.c: u... |
1778 |
nr_pages = get_nr_dirty_pages(); |
03ba3782e writeback: switch... |
1779 |
|
c4a77a6c7 writeback: make w... |
1780 |
if (nr_pages) { |
83ba7b071 writeback: simpli... |
1781 |
struct wb_writeback_work work = { |
c4a77a6c7 writeback: make w... |
1782 1783 1784 1785 |
.nr_pages = nr_pages, .sync_mode = WB_SYNC_NONE, .for_kupdate = 1, .range_cyclic = 1, |
0e175a183 writeback: Add a ... |
1786 |
.reason = WB_REASON_PERIODIC, |
c4a77a6c7 writeback: make w... |
1787 |
}; |
83ba7b071 writeback: simpli... |
1788 |
return wb_writeback(wb, &work); |
c4a77a6c7 writeback: make w... |
1789 |
} |
03ba3782e writeback: switch... |
1790 1791 1792 1793 1794 1795 1796 |
return 0; } /* * Retrieve work items and do the writeback they describe */ |
25d130ba2 mm/writeback: don... |
1797 |
static long wb_do_writeback(struct bdi_writeback *wb) |
03ba3782e writeback: switch... |
1798 |
{ |
83ba7b071 writeback: simpli... |
1799 |
struct wb_writeback_work *work; |
c4a77a6c7 writeback: make w... |
1800 |
long wrote = 0; |
03ba3782e writeback: switch... |
1801 |
|
4452226ea writeback: move b... |
1802 |
set_bit(WB_writeback_running, &wb->state); |
f0054bb1e writeback: move b... |
1803 |
while ((work = get_next_work_item(wb)) != NULL) { |
cc395d7f1 writeback: implem... |
1804 |
struct wb_completion *done = work->done; |
03ba3782e writeback: switch... |
1805 |
|
5634cc2aa writeback: update... |
1806 |
trace_writeback_exec(wb, work); |
455b28646 writeback: Initia... |
1807 |
|
83ba7b071 writeback: simpli... |
1808 |
wrote += wb_writeback(wb, work); |
03ba3782e writeback: switch... |
1809 |
|
8a1270cda writeback: remove... |
1810 |
if (work->auto_free) |
83ba7b071 writeback: simpli... |
1811 |
kfree(work); |
cc395d7f1 writeback: implem... |
1812 1813 |
if (done && atomic_dec_and_test(&done->cnt)) wake_up_all(&wb->bdi->wb_waitq); |
03ba3782e writeback: switch... |
1814 1815 1816 1817 1818 1819 |
} /* * Check for periodic writeback, kupdated() style */ wrote += wb_check_old_data_flush(wb); |
6585027a5 writeback: integr... |
1820 |
wrote += wb_check_background_flush(wb); |
4452226ea writeback: move b... |
1821 |
clear_bit(WB_writeback_running, &wb->state); |
03ba3782e writeback: switch... |
1822 1823 1824 1825 1826 1827 |
return wrote; } /* * Handle writeback of dirty data for the device backed by this bdi. Also |
839a8e866 writeback: replac... |
1828 |
* reschedules periodically and does kupdated style flushing. |
03ba3782e writeback: switch... |
1829 |
*/ |
f0054bb1e writeback: move b... |
1830 |
void wb_workfn(struct work_struct *work) |
03ba3782e writeback: switch... |
1831 |
{ |
839a8e866 writeback: replac... |
1832 1833 |
struct bdi_writeback *wb = container_of(to_delayed_work(work), struct bdi_writeback, dwork); |
03ba3782e writeback: switch... |
1834 |
long pages_written; |
f0054bb1e writeback: move b... |
1835 |
set_worker_desc("flush-%s", dev_name(wb->bdi->dev)); |
766f91641 kernel: remove PF... |
1836 |
current->flags |= PF_SWAPWRITE; |
455b28646 writeback: Initia... |
1837 |
|
839a8e866 writeback: replac... |
1838 |
if (likely(!current_is_workqueue_rescuer() || |
4452226ea writeback: move b... |
1839 |
!test_bit(WB_registered, &wb->state))) { |
6467716a3 writeback: optimi... |
1840 |
/* |
f0054bb1e writeback: move b... |
1841 |
* The normal path. Keep writing back @wb until its |
839a8e866 writeback: replac... |
1842 |
* work_list is empty. Note that this path is also taken |
f0054bb1e writeback: move b... |
1843 |
* if @wb is shutting down even when we're running off the |
839a8e866 writeback: replac... |
1844 |
* rescuer as work_list needs to be drained. |
6467716a3 writeback: optimi... |
1845 |
*/ |
839a8e866 writeback: replac... |
1846 |
do { |
25d130ba2 mm/writeback: don... |
1847 |
pages_written = wb_do_writeback(wb); |
839a8e866 writeback: replac... |
1848 |
trace_writeback_pages_written(pages_written); |
f0054bb1e writeback: move b... |
1849 |
} while (!list_empty(&wb->work_list)); |
839a8e866 writeback: replac... |
1850 1851 1852 1853 1854 1855 |
} else { /* * bdi_wq can't get enough workers and we're running off * the emergency worker. Don't hog it. Hopefully, 1024 is * enough for efficient IO. */ |
f0054bb1e writeback: move b... |
1856 |
pages_written = writeback_inodes_wb(wb, 1024, |
839a8e866 writeback: replac... |
1857 |
WB_REASON_FORKER_THREAD); |
455b28646 writeback: Initia... |
1858 |
trace_writeback_pages_written(pages_written); |
03ba3782e writeback: switch... |
1859 |
} |
f0054bb1e writeback: move b... |
1860 |
if (!list_empty(&wb->work_list)) |
6ca738d60 backing_dev: fix ... |
1861 1862 |
mod_delayed_work(bdi_wq, &wb->dwork, 0); else if (wb_has_dirty_io(wb) && dirty_writeback_interval) |
f0054bb1e writeback: move b... |
1863 |
wb_wakeup_delayed(wb); |
455b28646 writeback: Initia... |
1864 |
|
839a8e866 writeback: replac... |
1865 |
current->flags &= ~PF_SWAPWRITE; |
03ba3782e writeback: switch... |
1866 1867 1868 |
} /* |
b8c2f3474 writeback: simpli... |
1869 1870 |
* Start writeback of `nr_pages' pages. If `nr_pages' is zero, write back * the whole world. |
03ba3782e writeback: switch... |
1871 |
*/ |
0e175a183 writeback: Add a ... |
1872 |
void wakeup_flusher_threads(long nr_pages, enum wb_reason reason) |
03ba3782e writeback: switch... |
1873 |
{ |
b8c2f3474 writeback: simpli... |
1874 |
struct backing_dev_info *bdi; |
03ba3782e writeback: switch... |
1875 |
|
51350ea0d mm, writeback: fl... |
1876 1877 1878 1879 1880 |
/* * If we are expecting writeback progress we must submit plugged IO. */ if (blk_needs_flush_plug(current)) blk_schedule_flush_plug(current); |
47df3dded writeback: fix oc... |
1881 1882 |
if (!nr_pages) nr_pages = get_nr_dirty_pages(); |
03ba3782e writeback: switch... |
1883 |
|
b8c2f3474 writeback: simpli... |
1884 |
rcu_read_lock(); |
f2b651216 writeback: make w... |
1885 1886 |
list_for_each_entry_rcu(bdi, &bdi_list, bdi_list) { struct bdi_writeback *wb; |
f2b651216 writeback: make w... |
1887 1888 1889 |
if (!bdi_has_dirty_io(bdi)) continue; |
b817525a4 writeback: bdi_wr... |
1890 |
list_for_each_entry_rcu(wb, &bdi->wb_list, bdi_node) |
f2b651216 writeback: make w... |
1891 1892 1893 |
wb_start_writeback(wb, wb_split_bdi_pages(wb, nr_pages), false, reason); } |
cfc4ba536 writeback: use RC... |
1894 |
rcu_read_unlock(); |
1da177e4c Linux-2.6.12-rc2 |
1895 |
} |
a2f487069 fs: make sure the... |
1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 |
/* * Wake up bdi's periodically to make sure dirtytime inodes gets * written back periodically. We deliberately do *not* check the * b_dirtytime list in wb_has_dirty_io(), since this would cause the * kernel to be constantly waking up once there are any dirtytime * inodes on the system. So instead we define a separate delayed work * function which gets called much more rarely. (By default, only * once every 12 hours.) * * If there is any other write activity going on in the file system, * this function won't be necessary. But if the only thing that has * happened on the file system is a dirtytime inode caused by an atime * update, we need this infrastructure below to make sure that inode * eventually gets pushed out to disk. */ static void wakeup_dirtytime_writeback(struct work_struct *w); static DECLARE_DELAYED_WORK(dirtytime_work, wakeup_dirtytime_writeback); static void wakeup_dirtytime_writeback(struct work_struct *w) { struct backing_dev_info *bdi; rcu_read_lock(); list_for_each_entry_rcu(bdi, &bdi_list, bdi_list) { |
001fe6f61 writeback: make w... |
1920 |
struct bdi_writeback *wb; |
001fe6f61 writeback: make w... |
1921 |
|
b817525a4 writeback: bdi_wr... |
1922 |
list_for_each_entry_rcu(wb, &bdi->wb_list, bdi_node) |
6fdf860f1 writeback: fix bd... |
1923 1924 |
if (!list_empty(&wb->b_dirty_time)) wb_wakeup(wb); |
a2f487069 fs: make sure the... |
1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 |
} rcu_read_unlock(); schedule_delayed_work(&dirtytime_work, dirtytime_expire_interval * HZ); } static int __init start_dirtytime_writeback(void) { schedule_delayed_work(&dirtytime_work, dirtytime_expire_interval * HZ); return 0; } __initcall(start_dirtytime_writeback); |
1efff914a fs: add dirtytime... |
1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 |
int dirtytime_interval_handler(struct ctl_table *table, int write, void __user *buffer, size_t *lenp, loff_t *ppos) { int ret; ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos); if (ret == 0 && write) mod_delayed_work(system_wq, &dirtytime_work, 0); return ret; } |
03ba3782e writeback: switch... |
1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 |
static noinline void block_dump___mark_inode_dirty(struct inode *inode) { if (inode->i_ino || strcmp(inode->i_sb->s_id, "bdev")) { struct dentry *dentry; const char *name = "?"; dentry = d_find_alias(inode); if (dentry) { spin_lock(&dentry->d_lock); name = (const char *) dentry->d_name.name; } printk(KERN_DEBUG "%s(%d): dirtied inode %lu (%s) on %s ", current->comm, task_pid_nr(current), inode->i_ino, name, inode->i_sb->s_id); if (dentry) { spin_unlock(&dentry->d_lock); dput(dentry); } } } /** * __mark_inode_dirty - internal function * @inode: inode to mark * @flags: what kind of dirty (i.e. I_DIRTY_SYNC) * Mark an inode as dirty. Callers should use mark_inode_dirty or * mark_inode_dirty_sync. |
1da177e4c Linux-2.6.12-rc2 |
1975 |
* |
03ba3782e writeback: switch... |
1976 1977 1978 1979 1980 1981 1982 1983 1984 |
* Put the inode on the super block's dirty list. * * CAREFUL! We mark it dirty unconditionally, but move it onto the * dirty list only if it is hashed or if it refers to a blockdev. * If it was not hashed, it will never be added to the dirty list * even if it is later hashed, as it will have been marked dirty already. * * In short, make sure you hash any inodes _before_ you start marking * them dirty. |
1da177e4c Linux-2.6.12-rc2 |
1985 |
* |
03ba3782e writeback: switch... |
1986 1987 1988 1989 1990 1991 |
* Note that for blockdevs, inode->dirtied_when represents the dirtying time of * the block-special inode (/dev/hda1) itself. And the ->dirtied_when field of * the kernel-internal blockdev inode represents the dirtying time of the * blockdev's pages. This is why for I_DIRTY_PAGES we always use * page->mapping->host, so the page-dirtying time is recorded in the internal * blockdev inode. |
1da177e4c Linux-2.6.12-rc2 |
1992 |
*/ |
03ba3782e writeback: switch... |
1993 |
void __mark_inode_dirty(struct inode *inode, int flags) |
1da177e4c Linux-2.6.12-rc2 |
1994 |
{ |
dbce03b9e fs/writeback.c: f... |
1995 |
#define I_DIRTY_INODE (I_DIRTY_SYNC | I_DIRTY_DATASYNC) |
03ba3782e writeback: switch... |
1996 |
struct super_block *sb = inode->i_sb; |
0ae45f63d vfs: add support ... |
1997 1998 1999 |
int dirtytime; trace_writeback_mark_inode_dirty(inode, flags); |
1da177e4c Linux-2.6.12-rc2 |
2000 |
|
03ba3782e writeback: switch... |
2001 2002 2003 2004 |
/* * Don't do this for I_DIRTY_PAGES - that doesn't actually * dirty the inode itself */ |
0ae45f63d vfs: add support ... |
2005 |
if (flags & (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_TIME)) { |
9fb0a7da0 writeback: add mo... |
2006 |
trace_writeback_dirty_inode_start(inode, flags); |
03ba3782e writeback: switch... |
2007 |
if (sb->s_op->dirty_inode) |
aa3857295 fs: pass exact ty... |
2008 |
sb->s_op->dirty_inode(inode, flags); |
9fb0a7da0 writeback: add mo... |
2009 2010 |
trace_writeback_dirty_inode(inode, flags); |
03ba3782e writeback: switch... |
2011 |
} |
0ae45f63d vfs: add support ... |
2012 2013 2014 |
if (flags & I_DIRTY_INODE) flags &= ~I_DIRTY_TIME; dirtytime = flags & I_DIRTY_TIME; |
03ba3782e writeback: switch... |
2015 2016 |
/* |
9c6ac78eb writeback: fix a ... |
2017 2018 |
* Paired with smp_mb() in __writeback_single_inode() for the * following lockless i_state test. See there for details. |
03ba3782e writeback: switch... |
2019 2020 |
*/ smp_mb(); |
0ae45f63d vfs: add support ... |
2021 2022 |
if (((inode->i_state & flags) == flags) || (dirtytime && (inode->i_state & I_DIRTY_INODE))) |
03ba3782e writeback: switch... |
2023 2024 2025 2026 |
return; if (unlikely(block_dump)) block_dump___mark_inode_dirty(inode); |
250df6ed2 fs: protect inode... |
2027 |
spin_lock(&inode->i_lock); |
0ae45f63d vfs: add support ... |
2028 2029 |
if (dirtytime && (inode->i_state & I_DIRTY_INODE)) goto out_unlock_inode; |
03ba3782e writeback: switch... |
2030 2031 |
if ((inode->i_state & flags) != flags) { const int was_dirty = inode->i_state & I_DIRTY; |
52ebea749 writeback: make b... |
2032 |
inode_attach_wb(inode, NULL); |
0ae45f63d vfs: add support ... |
2033 2034 |
if (flags & I_DIRTY_INODE) inode->i_state &= ~I_DIRTY_TIME; |
03ba3782e writeback: switch... |
2035 2036 2037 2038 2039 2040 2041 2042 |
inode->i_state |= flags; /* * If the inode is being synced, just update its dirty state. * The unlocker will place the inode on the appropriate * superblock list, based upon its state. */ if (inode->i_state & I_SYNC) |
250df6ed2 fs: protect inode... |
2043 |
goto out_unlock_inode; |
03ba3782e writeback: switch... |
2044 2045 2046 2047 2048 2049 |
/* * Only add valid (hashed) inodes to the superblock's * dirty list. Add blockdev inodes as well. */ if (!S_ISBLK(inode->i_mode)) { |
1d3382cbf new helper: inode... |
2050 |
if (inode_unhashed(inode)) |
250df6ed2 fs: protect inode... |
2051 |
goto out_unlock_inode; |
03ba3782e writeback: switch... |
2052 |
} |
a4ffdde6e simplify checks f... |
2053 |
if (inode->i_state & I_FREEING) |
250df6ed2 fs: protect inode... |
2054 |
goto out_unlock_inode; |
03ba3782e writeback: switch... |
2055 2056 2057 2058 2059 2060 |
/* * If the inode was already on b_dirty/b_io/b_more_io, don't * reposition it (that would break b_dirty time-ordering). */ if (!was_dirty) { |
87e1d789b writeback: implem... |
2061 |
struct bdi_writeback *wb; |
d6c10f1fc writeback: implem... |
2062 |
struct list_head *dirty_list; |
a66979aba fs: move i_wb_lis... |
2063 |
bool wakeup_bdi = false; |
253c34e9b writeback: preven... |
2064 |
|
87e1d789b writeback: implem... |
2065 |
wb = locked_inode_to_wb_and_lock_list(inode); |
253c34e9b writeback: preven... |
2066 |
|
0747259d1 writeback: dirty ... |
2067 2068 2069 2070 |
WARN(bdi_cap_writeback_dirty(wb->bdi) && !test_bit(WB_registered, &wb->state), "bdi-%s not registered ", wb->bdi->name); |
03ba3782e writeback: switch... |
2071 2072 |
inode->dirtied_when = jiffies; |
a2f487069 fs: make sure the... |
2073 2074 |
if (dirtytime) inode->dirtied_time_when = jiffies; |
d6c10f1fc writeback: implem... |
2075 |
|
a2f487069 fs: make sure the... |
2076 |
if (inode->i_state & (I_DIRTY_INODE | I_DIRTY_PAGES)) |
0747259d1 writeback: dirty ... |
2077 |
dirty_list = &wb->b_dirty; |
a2f487069 fs: make sure the... |
2078 |
else |
0747259d1 writeback: dirty ... |
2079 |
dirty_list = &wb->b_dirty_time; |
d6c10f1fc writeback: implem... |
2080 |
|
c7f540849 inode: rename i_w... |
2081 |
wakeup_bdi = inode_io_list_move_locked(inode, wb, |
d6c10f1fc writeback: implem... |
2082 |
dirty_list); |
0747259d1 writeback: dirty ... |
2083 |
spin_unlock(&wb->list_lock); |
0ae45f63d vfs: add support ... |
2084 |
trace_writeback_dirty_inode_enqueue(inode); |
a66979aba fs: move i_wb_lis... |
2085 |
|
d6c10f1fc writeback: implem... |
2086 2087 2088 2089 2090 2091 |
/* * If this is the first dirty inode for this bdi, * we have to wake-up the corresponding bdi thread * to make sure background write-back happens * later. */ |
0747259d1 writeback: dirty ... |
2092 2093 |
if (bdi_cap_writeback_dirty(wb->bdi) && wakeup_bdi) wb_wakeup_delayed(wb); |
a66979aba fs: move i_wb_lis... |
2094 |
return; |
1da177e4c Linux-2.6.12-rc2 |
2095 |
} |
1da177e4c Linux-2.6.12-rc2 |
2096 |
} |
250df6ed2 fs: protect inode... |
2097 2098 |
out_unlock_inode: spin_unlock(&inode->i_lock); |
253c34e9b writeback: preven... |
2099 |
|
dbce03b9e fs/writeback.c: f... |
2100 |
#undef I_DIRTY_INODE |
03ba3782e writeback: switch... |
2101 2102 |
} EXPORT_SYMBOL(__mark_inode_dirty); |
e97fedb9e sync: serialise p... |
2103 2104 2105 2106 2107 2108 2109 2110 2111 |
/* * The @s_sync_lock is used to serialise concurrent sync operations * to avoid lock contention problems with concurrent wait_sb_inodes() calls. * Concurrent callers will block on the s_sync_lock rather than doing contending * walks. The queueing maintains sync(2) required behaviour as all the IO that * has been issued up to the time this function is enter is guaranteed to be * completed by the time we have gained the lock and waited for all IO that is * in progress regardless of the order callers are granted the lock. */ |
b6e51316d writeback: separa... |
2112 |
static void wait_sb_inodes(struct super_block *sb) |
03ba3782e writeback: switch... |
2113 |
{ |
6c60d2b57 fs/fs-writeback.c... |
2114 |
LIST_HEAD(sync_list); |
03ba3782e writeback: switch... |
2115 2116 2117 2118 2119 |
/* * We need to be protected against the filesystem going from * r/o to r/w or vice versa. */ |
b6e51316d writeback: separa... |
2120 |
WARN_ON(!rwsem_is_locked(&sb->s_umount)); |
03ba3782e writeback: switch... |
2121 |
|
e97fedb9e sync: serialise p... |
2122 |
mutex_lock(&sb->s_sync_lock); |
03ba3782e writeback: switch... |
2123 2124 |
/* |
6c60d2b57 fs/fs-writeback.c... |
2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 |
* Splice the writeback list onto a temporary list to avoid waiting on * inodes that have started writeback after this point. * * Use rcu_read_lock() to keep the inodes around until we have a * reference. s_inode_wblist_lock protects sb->s_inodes_wb as well as * the local list because inodes can be dropped from either by writeback * completion. */ rcu_read_lock(); spin_lock_irq(&sb->s_inode_wblist_lock); list_splice_init(&sb->s_inodes_wb, &sync_list); /* * Data integrity sync. Must wait for all pages under writeback, because * there may have been pages dirtied before our sync call, but which had * writeout started before we write it out. In which case, the inode * may not be on the dirty list, but we still have to wait for that * writeout. |
03ba3782e writeback: switch... |
2143 |
*/ |
6c60d2b57 fs/fs-writeback.c... |
2144 2145 2146 |
while (!list_empty(&sync_list)) { struct inode *inode = list_first_entry(&sync_list, struct inode, i_wb_list); |
250df6ed2 fs: protect inode... |
2147 |
struct address_space *mapping = inode->i_mapping; |
03ba3782e writeback: switch... |
2148 |
|
6c60d2b57 fs/fs-writeback.c... |
2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 |
/* * Move each inode back to the wb list before we drop the lock * to preserve consistency between i_wb_list and the mapping * writeback tag. Writeback completion is responsible to remove * the inode from either list once the writeback tag is cleared. */ list_move_tail(&inode->i_wb_list, &sb->s_inodes_wb); /* * The mapping can appear untagged while still on-list since we * do not have the mapping lock. Skip it here, wb completion * will remove it. */ if (!mapping_tagged(mapping, PAGECACHE_TAG_WRITEBACK)) continue; spin_unlock_irq(&sb->s_inode_wblist_lock); |
250df6ed2 fs: protect inode... |
2166 |
spin_lock(&inode->i_lock); |
6c60d2b57 fs/fs-writeback.c... |
2167 |
if (inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) { |
250df6ed2 fs: protect inode... |
2168 |
spin_unlock(&inode->i_lock); |
6c60d2b57 fs/fs-writeback.c... |
2169 2170 |
spin_lock_irq(&sb->s_inode_wblist_lock); |
03ba3782e writeback: switch... |
2171 |
continue; |
250df6ed2 fs: protect inode... |
2172 |
} |
03ba3782e writeback: switch... |
2173 |
__iget(inode); |
250df6ed2 fs: protect inode... |
2174 |
spin_unlock(&inode->i_lock); |
6c60d2b57 fs/fs-writeback.c... |
2175 |
rcu_read_unlock(); |
03ba3782e writeback: switch... |
2176 |
|
aa750fd71 mm/filemap.c: mak... |
2177 2178 2179 2180 2181 2182 |
/* * We keep the error status of individual mapping so that * applications can catch the writeback error using fsync(2). * See filemap_fdatawait_keep_errors() for details. */ filemap_fdatawait_keep_errors(mapping); |
03ba3782e writeback: switch... |
2183 2184 |
cond_resched(); |
6c60d2b57 fs/fs-writeback.c... |
2185 2186 2187 2188 |
iput(inode); rcu_read_lock(); spin_lock_irq(&sb->s_inode_wblist_lock); |
03ba3782e writeback: switch... |
2189 |
} |
6c60d2b57 fs/fs-writeback.c... |
2190 2191 |
spin_unlock_irq(&sb->s_inode_wblist_lock); rcu_read_unlock(); |
e97fedb9e sync: serialise p... |
2192 |
mutex_unlock(&sb->s_sync_lock); |
1da177e4c Linux-2.6.12-rc2 |
2193 |
} |
f30a7d0cc writeback: restru... |
2194 2195 |
static void __writeback_inodes_sb_nr(struct super_block *sb, unsigned long nr, enum wb_reason reason, bool skip_if_busy) |
1da177e4c Linux-2.6.12-rc2 |
2196 |
{ |
cc395d7f1 writeback: implem... |
2197 |
DEFINE_WB_COMPLETION_ONSTACK(done); |
83ba7b071 writeback: simpli... |
2198 |
struct wb_writeback_work work = { |
6e6938b6d writeback: introd... |
2199 2200 2201 2202 2203 |
.sb = sb, .sync_mode = WB_SYNC_NONE, .tagged_writepages = 1, .done = &done, .nr_pages = nr, |
0e175a183 writeback: Add a ... |
2204 |
.reason = reason, |
3c4d71653 writeback: queue ... |
2205 |
}; |
e79729123 writeback: don't ... |
2206 |
struct backing_dev_info *bdi = sb->s_bdi; |
d8a8559cd writeback: get ri... |
2207 |
|
e79729123 writeback: don't ... |
2208 |
if (!bdi_has_dirty_io(bdi) || bdi == &noop_backing_dev_info) |
6eedc7015 vfs: Move noop_ba... |
2209 |
return; |
cf37e9724 writeback: enforc... |
2210 |
WARN_ON(!rwsem_is_locked(&sb->s_umount)); |
f30a7d0cc writeback: restru... |
2211 |
|
db1253604 writeback: make w... |
2212 |
bdi_split_work_to_wbs(sb->s_bdi, &work, skip_if_busy); |
cc395d7f1 writeback: implem... |
2213 |
wb_wait_for_completion(bdi, &done); |
e913fc825 writeback: fix WB... |
2214 |
} |
f30a7d0cc writeback: restru... |
2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 |
/** * writeback_inodes_sb_nr - writeback dirty inodes from given super_block * @sb: the superblock * @nr: the number of pages to write * @reason: reason why some writeback work initiated * * Start writeback on some inodes on this super_block. No guarantees are made * on how many (if any) will be written, and this function does not wait * for IO completion of submitted IO. */ void writeback_inodes_sb_nr(struct super_block *sb, unsigned long nr, enum wb_reason reason) { __writeback_inodes_sb_nr(sb, nr, reason, false); } |
3259f8bed Add new functions... |
2232 2233 2234 2235 2236 |
EXPORT_SYMBOL(writeback_inodes_sb_nr); /** * writeback_inodes_sb - writeback dirty inodes from given super_block * @sb: the superblock |
786228ab3 writeback: Fix is... |
2237 |
* @reason: reason why some writeback work was initiated |
3259f8bed Add new functions... |
2238 2239 2240 2241 2242 |
* * Start writeback on some inodes on this super_block. No guarantees are made * on how many (if any) will be written, and this function does not wait * for IO completion of submitted IO. */ |
0e175a183 writeback: Add a ... |
2243 |
void writeback_inodes_sb(struct super_block *sb, enum wb_reason reason) |
3259f8bed Add new functions... |
2244 |
{ |
0e175a183 writeback: Add a ... |
2245 |
return writeback_inodes_sb_nr(sb, get_nr_dirty_pages(), reason); |
3259f8bed Add new functions... |
2246 |
} |
0e3c9a228 Revert "writeback... |
2247 |
EXPORT_SYMBOL(writeback_inodes_sb); |
e913fc825 writeback: fix WB... |
2248 2249 |
/** |
10ee27a06 vfs: re-implement... |
2250 |
* try_to_writeback_inodes_sb_nr - try to start writeback if none underway |
17bd55d03 fs-writeback: Add... |
2251 |
* @sb: the superblock |
10ee27a06 vfs: re-implement... |
2252 2253 |
* @nr: the number of pages to write * @reason: the reason of writeback |
17bd55d03 fs-writeback: Add... |
2254 |
* |
10ee27a06 vfs: re-implement... |
2255 |
* Invoke writeback_inodes_sb_nr if no writeback is currently underway. |
17bd55d03 fs-writeback: Add... |
2256 2257 |
* Returns 1 if writeback was started, 0 if not. */ |
f30a7d0cc writeback: restru... |
2258 2259 |
bool try_to_writeback_inodes_sb_nr(struct super_block *sb, unsigned long nr, enum wb_reason reason) |
17bd55d03 fs-writeback: Add... |
2260 |
{ |
10ee27a06 vfs: re-implement... |
2261 |
if (!down_read_trylock(&sb->s_umount)) |
f30a7d0cc writeback: restru... |
2262 |
return false; |
10ee27a06 vfs: re-implement... |
2263 |
|
f30a7d0cc writeback: restru... |
2264 |
__writeback_inodes_sb_nr(sb, nr, reason, true); |
10ee27a06 vfs: re-implement... |
2265 |
up_read(&sb->s_umount); |
f30a7d0cc writeback: restru... |
2266 |
return true; |
17bd55d03 fs-writeback: Add... |
2267 |
} |
10ee27a06 vfs: re-implement... |
2268 |
EXPORT_SYMBOL(try_to_writeback_inodes_sb_nr); |
17bd55d03 fs-writeback: Add... |
2269 2270 |
/** |
10ee27a06 vfs: re-implement... |
2271 |
* try_to_writeback_inodes_sb - try to start writeback if none underway |
3259f8bed Add new functions... |
2272 |
* @sb: the superblock |
786228ab3 writeback: Fix is... |
2273 |
* @reason: reason why some writeback work was initiated |
3259f8bed Add new functions... |
2274 |
* |
10ee27a06 vfs: re-implement... |
2275 |
* Implement by try_to_writeback_inodes_sb_nr() |
3259f8bed Add new functions... |
2276 2277 |
* Returns 1 if writeback was started, 0 if not. */ |
f30a7d0cc writeback: restru... |
2278 |
bool try_to_writeback_inodes_sb(struct super_block *sb, enum wb_reason reason) |
3259f8bed Add new functions... |
2279 |
{ |
10ee27a06 vfs: re-implement... |
2280 |
return try_to_writeback_inodes_sb_nr(sb, get_nr_dirty_pages(), reason); |
3259f8bed Add new functions... |
2281 |
} |
10ee27a06 vfs: re-implement... |
2282 |
EXPORT_SYMBOL(try_to_writeback_inodes_sb); |
3259f8bed Add new functions... |
2283 2284 |
/** |
d8a8559cd writeback: get ri... |
2285 |
* sync_inodes_sb - sync sb inode pages |
0dc83bd30 Revert "writeback... |
2286 |
* @sb: the superblock |
d8a8559cd writeback: get ri... |
2287 2288 |
* * This function writes and waits on any dirty inode belonging to this |
0dc83bd30 Revert "writeback... |
2289 |
* super_block. |
d8a8559cd writeback: get ri... |
2290 |
*/ |
0dc83bd30 Revert "writeback... |
2291 |
void sync_inodes_sb(struct super_block *sb) |
d8a8559cd writeback: get ri... |
2292 |
{ |
cc395d7f1 writeback: implem... |
2293 |
DEFINE_WB_COMPLETION_ONSTACK(done); |
83ba7b071 writeback: simpli... |
2294 |
struct wb_writeback_work work = { |
3c4d71653 writeback: queue ... |
2295 2296 2297 2298 |
.sb = sb, .sync_mode = WB_SYNC_ALL, .nr_pages = LONG_MAX, .range_cyclic = 0, |
83ba7b071 writeback: simpli... |
2299 |
.done = &done, |
0e175a183 writeback: Add a ... |
2300 |
.reason = WB_REASON_SYNC, |
7747bd4bc sync: don't block... |
2301 |
.for_sync = 1, |
3c4d71653 writeback: queue ... |
2302 |
}; |
e79729123 writeback: don't ... |
2303 |
struct backing_dev_info *bdi = sb->s_bdi; |
3c4d71653 writeback: queue ... |
2304 |
|
006a0973e writeback: sync_i... |
2305 2306 2307 2308 2309 2310 |
/* * Can't skip on !bdi_has_dirty() because we should wait for !dirty * inodes under writeback and I_DIRTY_TIME inodes ignored by * bdi_has_dirty() need to be written out too. */ if (bdi == &noop_backing_dev_info) |
6eedc7015 vfs: Move noop_ba... |
2311 |
return; |
cf37e9724 writeback: enforc... |
2312 |
WARN_ON(!rwsem_is_locked(&sb->s_umount)); |
db1253604 writeback: make w... |
2313 |
bdi_split_work_to_wbs(bdi, &work, false); |
cc395d7f1 writeback: implem... |
2314 |
wb_wait_for_completion(bdi, &done); |
83ba7b071 writeback: simpli... |
2315 |
|
b6e51316d writeback: separa... |
2316 |
wait_sb_inodes(sb); |
1da177e4c Linux-2.6.12-rc2 |
2317 |
} |
d8a8559cd writeback: get ri... |
2318 |
EXPORT_SYMBOL(sync_inodes_sb); |
1da177e4c Linux-2.6.12-rc2 |
2319 |
|
1da177e4c Linux-2.6.12-rc2 |
2320 |
/** |
7f04c26d7 [PATCH] fix nr_un... |
2321 2322 2323 2324 2325 2326 |
* write_inode_now - write an inode to disk * @inode: inode to write to disk * @sync: whether the write should be synchronous or not * * This function commits an inode to disk immediately if it is dirty. This is * primarily needed by knfsd. |
1da177e4c Linux-2.6.12-rc2 |
2327 |
* |
7f04c26d7 [PATCH] fix nr_un... |
2328 |
* The caller must either have a ref on the inode or must have set I_WILL_FREE. |
1da177e4c Linux-2.6.12-rc2 |
2329 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
2330 2331 |
int write_inode_now(struct inode *inode, int sync) { |
1da177e4c Linux-2.6.12-rc2 |
2332 2333 |
struct writeback_control wbc = { .nr_to_write = LONG_MAX, |
18914b188 write_inode_now()... |
2334 |
.sync_mode = sync ? WB_SYNC_ALL : WB_SYNC_NONE, |
111ebb6e6 [PATCH] writeback... |
2335 2336 |
.range_start = 0, .range_end = LLONG_MAX, |
1da177e4c Linux-2.6.12-rc2 |
2337 2338 2339 |
}; if (!mapping_cap_writeback_dirty(inode->i_mapping)) |
49364ce25 [PATCH] write_ino... |
2340 |
wbc.nr_to_write = 0; |
1da177e4c Linux-2.6.12-rc2 |
2341 2342 |
might_sleep(); |
aaf255933 writeback, cgroup... |
2343 |
return writeback_single_inode(inode, &wbc); |
1da177e4c Linux-2.6.12-rc2 |
2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 |
} EXPORT_SYMBOL(write_inode_now); /** * sync_inode - write an inode and its pages to disk. * @inode: the inode to sync * @wbc: controls the writeback mode * * sync_inode() will write an inode and its pages to disk. It will also * correctly update the inode on its superblock's dirty inode lists and will * update inode->i_state. * * The caller must have a ref on the inode. */ int sync_inode(struct inode *inode, struct writeback_control *wbc) { |
aaf255933 writeback, cgroup... |
2360 |
return writeback_single_inode(inode, wbc); |
1da177e4c Linux-2.6.12-rc2 |
2361 2362 |
} EXPORT_SYMBOL(sync_inode); |
c37650161 fs: add sync_inod... |
2363 2364 |
/** |
c691b9d98 sync_inode_metada... |
2365 |
* sync_inode_metadata - write an inode to disk |
c37650161 fs: add sync_inod... |
2366 2367 2368 |
* @inode: the inode to sync * @wait: wait for I/O to complete. * |
c691b9d98 sync_inode_metada... |
2369 |
* Write an inode to disk and adjust its dirty state after completion. |
c37650161 fs: add sync_inod... |
2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 |
* * Note: only writes the actual inode, no associated data or other metadata. */ int sync_inode_metadata(struct inode *inode, int wait) { struct writeback_control wbc = { .sync_mode = wait ? WB_SYNC_ALL : WB_SYNC_NONE, .nr_to_write = 0, /* metadata-only */ }; return sync_inode(inode, &wbc); } EXPORT_SYMBOL(sync_inode_metadata); |