Blame view
fs/fs-writeback.c
37.5 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> |
f5ff8422b Fix warnings with... |
17 |
#include <linux/module.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 25 |
#include <linux/kthread.h> #include <linux/freezer.h> |
1da177e4c Linux-2.6.12-rc2 |
26 27 28 |
#include <linux/writeback.h> #include <linux/blkdev.h> #include <linux/backing-dev.h> |
455b28646 writeback: Initia... |
29 |
#include <linux/tracepoint.h> |
07f3f05c1 [PATCH] BLOCK: Mo... |
30 |
#include "internal.h" |
1da177e4c Linux-2.6.12-rc2 |
31 |
|
d0bceac74 writeback: get ri... |
32 |
/* |
bc31b86a5 writeback: move M... |
33 34 35 36 37 |
* 4MB minimal write chunk size */ #define MIN_WRITEBACK_PAGES (4096UL >> (PAGE_CACHE_SHIFT - 10)) /* |
c4a77a6c7 writeback: make w... |
38 39 |
* Passed into wb_writeback(), essentially a subset of writeback_control */ |
83ba7b071 writeback: simpli... |
40 |
struct wb_writeback_work { |
c4a77a6c7 writeback: make w... |
41 42 |
long nr_pages; struct super_block *sb; |
d46db3d58 writeback: make w... |
43 |
unsigned long *older_than_this; |
c4a77a6c7 writeback: make w... |
44 |
enum writeback_sync_modes sync_mode; |
6e6938b6d writeback: introd... |
45 |
unsigned int tagged_writepages:1; |
52957fe1c fs-writeback.c: b... |
46 47 48 |
unsigned int for_kupdate:1; unsigned int range_cyclic:1; unsigned int for_background:1; |
0e175a183 writeback: Add a ... |
49 |
enum wb_reason reason; /* why was writeback initiated? */ |
c4a77a6c7 writeback: make w... |
50 |
|
8010c3b63 writeback: add co... |
51 |
struct list_head list; /* pending work list */ |
83ba7b071 writeback: simpli... |
52 |
struct completion *done; /* set if the caller waits */ |
03ba3782e writeback: switch... |
53 |
}; |
455b28646 writeback: Initia... |
54 55 56 57 58 59 60 |
/* * Include the creation of the trace points after defining the * wb_writeback_work structure so that the definition remains local to this * file. */ #define CREATE_TRACE_POINTS #include <trace/events/writeback.h> |
455b28646 writeback: Initia... |
61 62 63 64 |
/* * We don't actually have pdflush, but this one is exported though /proc... */ int nr_pdflush_threads; |
f11b00f3b fs/fs-writeback.c... |
65 66 67 68 |
/** * writeback_in_progress - determine whether there is writeback in progress * @bdi: the device's backing_dev_info structure. * |
03ba3782e writeback: switch... |
69 70 |
* Determine whether there is writeback waiting to be handled against a * backing device. |
f11b00f3b fs/fs-writeback.c... |
71 72 73 |
*/ int writeback_in_progress(struct backing_dev_info *bdi) { |
81d73a32d mm: fix writeback... |
74 |
return test_bit(BDI_writeback_running, &bdi->state); |
f11b00f3b fs/fs-writeback.c... |
75 |
} |
692ebd17c bdi: Fix warnings... |
76 77 78 |
static inline struct backing_dev_info *inode_to_bdi(struct inode *inode) { struct super_block *sb = inode->i_sb; |
692ebd17c bdi: Fix warnings... |
79 |
|
aaead25b9 writeback: always... |
80 81 82 83 |
if (strcmp(sb->s_type->name, "bdev") == 0) return inode->i_mapping->backing_dev_info; return sb->s_bdi; |
692ebd17c bdi: Fix warnings... |
84 |
} |
7ccf19a80 fs: inode split I... |
85 86 87 88 |
static inline struct inode *wb_inode(struct list_head *head) { return list_entry(head, struct inode, i_wb_list); } |
6585027a5 writeback: integr... |
89 90 |
/* Wakeup flusher thread or forker thread to fork it. Requires bdi->wb_lock. */ static void bdi_wakeup_flusher(struct backing_dev_info *bdi) |
03ba3782e writeback: switch... |
91 |
{ |
fff5b85aa writeback: move b... |
92 93 94 95 96 97 98 |
if (bdi->wb.task) { wake_up_process(bdi->wb.task); } else { /* * The bdi thread isn't there, wake up the forker thread which * will create and run it. */ |
03ba3782e writeback: switch... |
99 |
wake_up_process(default_backing_dev_info.wb.task); |
1da177e4c Linux-2.6.12-rc2 |
100 |
} |
6585027a5 writeback: integr... |
101 102 103 104 105 106 107 108 109 110 111 112 |
} static void bdi_queue_work(struct backing_dev_info *bdi, struct wb_writeback_work *work) { trace_writeback_queue(bdi, work); spin_lock_bh(&bdi->wb_lock); list_add_tail(&work->list, &bdi->work_list); if (!bdi->wb.task) trace_writeback_nothread(bdi, work); bdi_wakeup_flusher(bdi); |
6467716a3 writeback: optimi... |
113 |
spin_unlock_bh(&bdi->wb_lock); |
1da177e4c Linux-2.6.12-rc2 |
114 |
} |
83ba7b071 writeback: simpli... |
115 116 |
static void __bdi_start_writeback(struct backing_dev_info *bdi, long nr_pages, |
0e175a183 writeback: Add a ... |
117 |
bool range_cyclic, enum wb_reason reason) |
1da177e4c Linux-2.6.12-rc2 |
118 |
{ |
83ba7b071 writeback: simpli... |
119 |
struct wb_writeback_work *work; |
03ba3782e writeback: switch... |
120 |
|
bcddc3f01 writeback: inline... |
121 122 123 124 |
/* * This is WB_SYNC_NONE writeback, so if allocation fails just * wakeup the thread for old dirty data writeback */ |
83ba7b071 writeback: simpli... |
125 126 |
work = kzalloc(sizeof(*work), GFP_ATOMIC); if (!work) { |
455b28646 writeback: Initia... |
127 128 |
if (bdi->wb.task) { trace_writeback_nowork(bdi); |
83ba7b071 writeback: simpli... |
129 |
wake_up_process(bdi->wb.task); |
455b28646 writeback: Initia... |
130 |
} |
83ba7b071 writeback: simpli... |
131 |
return; |
bcddc3f01 writeback: inline... |
132 |
} |
03ba3782e writeback: switch... |
133 |
|
83ba7b071 writeback: simpli... |
134 135 136 |
work->sync_mode = WB_SYNC_NONE; work->nr_pages = nr_pages; work->range_cyclic = range_cyclic; |
0e175a183 writeback: Add a ... |
137 |
work->reason = reason; |
03ba3782e writeback: switch... |
138 |
|
83ba7b071 writeback: simpli... |
139 |
bdi_queue_work(bdi, work); |
b6e51316d writeback: separa... |
140 141 142 143 144 145 |
} /** * bdi_start_writeback - start writeback * @bdi: the backing device to write from * @nr_pages: the number of pages to write |
786228ab3 writeback: Fix is... |
146 |
* @reason: reason why some writeback work was initiated |
b6e51316d writeback: separa... |
147 148 149 |
* * Description: * This does WB_SYNC_NONE opportunistic writeback. The IO is only |
25985edce Fix common misspe... |
150 |
* started when this function returns, we make no guarantees on |
0e3c9a228 Revert "writeback... |
151 |
* completion. Caller need not hold sb s_umount semaphore. |
b6e51316d writeback: separa... |
152 153 |
* */ |
0e175a183 writeback: Add a ... |
154 155 |
void bdi_start_writeback(struct backing_dev_info *bdi, long nr_pages, enum wb_reason reason) |
b6e51316d writeback: separa... |
156 |
{ |
0e175a183 writeback: Add a ... |
157 |
__bdi_start_writeback(bdi, nr_pages, true, reason); |
c5444198c writeback: simpli... |
158 |
} |
d3ddec763 writeback: stop b... |
159 |
|
c5444198c writeback: simpli... |
160 161 162 163 164 |
/** * bdi_start_background_writeback - start background writeback * @bdi: the backing device to write from * * Description: |
6585027a5 writeback: integr... |
165 166 167 168 |
* This makes sure WB_SYNC_NONE background writeback happens. When * this function returns, it is only guaranteed that for given BDI * some IO is happening if we are over background dirty threshold. * Caller need not hold sb s_umount semaphore. |
c5444198c writeback: simpli... |
169 170 171 |
*/ void bdi_start_background_writeback(struct backing_dev_info *bdi) { |
6585027a5 writeback: integr... |
172 173 174 175 |
/* * We just wake up the flusher thread. It will perform background * writeback as soon as there is no other work to do. */ |
71927e84e writeback: trace ... |
176 |
trace_writeback_wake_background(bdi); |
6585027a5 writeback: integr... |
177 178 179 |
spin_lock_bh(&bdi->wb_lock); bdi_wakeup_flusher(bdi); spin_unlock_bh(&bdi->wb_lock); |
1da177e4c Linux-2.6.12-rc2 |
180 181 182 |
} /* |
a66979aba fs: move i_wb_lis... |
183 184 185 186 |
* Remove the inode from the writeback list it is on. */ void inode_wb_list_del(struct inode *inode) { |
f758eeabe writeback: split ... |
187 188 189 |
struct backing_dev_info *bdi = inode_to_bdi(inode); spin_lock(&bdi->wb.list_lock); |
a66979aba fs: move i_wb_lis... |
190 |
list_del_init(&inode->i_wb_list); |
f758eeabe writeback: split ... |
191 |
spin_unlock(&bdi->wb.list_lock); |
a66979aba fs: move i_wb_lis... |
192 |
} |
a66979aba fs: move i_wb_lis... |
193 |
/* |
6610a0bc8 writeback: fix ti... |
194 195 196 197 |
* 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... |
198 |
* already the most-recently-dirtied inode on the b_dirty list. If that is |
6610a0bc8 writeback: fix ti... |
199 200 201 |
* 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 ... |
202 |
static void redirty_tail(struct inode *inode, struct bdi_writeback *wb) |
6610a0bc8 writeback: fix ti... |
203 |
{ |
f758eeabe writeback: split ... |
204 |
assert_spin_locked(&wb->list_lock); |
03ba3782e writeback: switch... |
205 |
if (!list_empty(&wb->b_dirty)) { |
66f3b8e2e writeback: move d... |
206 |
struct inode *tail; |
6610a0bc8 writeback: fix ti... |
207 |
|
7ccf19a80 fs: inode split I... |
208 |
tail = wb_inode(wb->b_dirty.next); |
66f3b8e2e writeback: move d... |
209 |
if (time_before(inode->dirtied_when, tail->dirtied_when)) |
6610a0bc8 writeback: fix ti... |
210 211 |
inode->dirtied_when = jiffies; } |
7ccf19a80 fs: inode split I... |
212 |
list_move(&inode->i_wb_list, &wb->b_dirty); |
6610a0bc8 writeback: fix ti... |
213 214 215 |
} /* |
66f3b8e2e writeback: move d... |
216 |
* requeue inode for re-scanning after bdi->b_io list is exhausted. |
c986d1e2a writeback: fix ti... |
217 |
*/ |
f758eeabe writeback: split ... |
218 |
static void requeue_io(struct inode *inode, struct bdi_writeback *wb) |
c986d1e2a writeback: fix ti... |
219 |
{ |
f758eeabe writeback: split ... |
220 |
assert_spin_locked(&wb->list_lock); |
7ccf19a80 fs: inode split I... |
221 |
list_move(&inode->i_wb_list, &wb->b_more_io); |
c986d1e2a writeback: fix ti... |
222 |
} |
1c0eeaf56 introduce I_SYNC |
223 224 225 |
static void inode_sync_complete(struct inode *inode) { /* |
a66979aba fs: move i_wb_lis... |
226 |
* Prevent speculative execution through |
f758eeabe writeback: split ... |
227 |
* spin_unlock(&wb->list_lock); |
1c0eeaf56 introduce I_SYNC |
228 |
*/ |
a66979aba fs: move i_wb_lis... |
229 |
|
1c0eeaf56 introduce I_SYNC |
230 231 232 |
smp_mb(); wake_up_bit(&inode->i_state, __I_SYNC); } |
d2caa3c54 writeback: guard ... |
233 234 235 236 237 238 239 240 |
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... |
241 |
* from permanently stopping the whole bdi writeback. |
d2caa3c54 writeback: guard ... |
242 243 244 245 246 |
*/ ret = ret && time_before_eq(inode->dirtied_when, jiffies); #endif return ret; } |
c986d1e2a writeback: fix ti... |
247 |
/* |
2c1365791 writeback: fix ti... |
248 249 |
* Move expired dirty inodes from @delaying_queue to @dispatch_queue. */ |
e84d0a4f8 writeback: trace ... |
250 |
static int move_expired_inodes(struct list_head *delaying_queue, |
2c1365791 writeback: fix ti... |
251 |
struct list_head *dispatch_queue, |
ad4e38dd6 writeback: send w... |
252 |
struct wb_writeback_work *work) |
2c1365791 writeback: fix ti... |
253 |
{ |
5c03449d3 writeback: move i... |
254 255 |
LIST_HEAD(tmp); struct list_head *pos, *node; |
cf137307c writeback: don't ... |
256 |
struct super_block *sb = NULL; |
5c03449d3 writeback: move i... |
257 |
struct inode *inode; |
cf137307c writeback: don't ... |
258 |
int do_sb_sort = 0; |
e84d0a4f8 writeback: trace ... |
259 |
int moved = 0; |
5c03449d3 writeback: move i... |
260 |
|
2c1365791 writeback: fix ti... |
261 |
while (!list_empty(delaying_queue)) { |
7ccf19a80 fs: inode split I... |
262 |
inode = wb_inode(delaying_queue->prev); |
ad4e38dd6 writeback: send w... |
263 264 |
if (work->older_than_this && inode_dirtied_after(inode, *work->older_than_this)) |
2c1365791 writeback: fix ti... |
265 |
break; |
cf137307c writeback: don't ... |
266 267 268 |
if (sb && sb != inode->i_sb) do_sb_sort = 1; sb = inode->i_sb; |
7ccf19a80 fs: inode split I... |
269 |
list_move(&inode->i_wb_list, &tmp); |
e84d0a4f8 writeback: trace ... |
270 |
moved++; |
5c03449d3 writeback: move i... |
271 |
} |
cf137307c writeback: don't ... |
272 273 274 |
/* 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 ... |
275 |
goto out; |
cf137307c writeback: don't ... |
276 |
} |
5c03449d3 writeback: move i... |
277 278 |
/* Move inodes from one superblock together */ while (!list_empty(&tmp)) { |
7ccf19a80 fs: inode split I... |
279 |
sb = wb_inode(tmp.prev)->i_sb; |
5c03449d3 writeback: move i... |
280 |
list_for_each_prev_safe(pos, node, &tmp) { |
7ccf19a80 fs: inode split I... |
281 |
inode = wb_inode(pos); |
5c03449d3 writeback: move i... |
282 |
if (inode->i_sb == sb) |
7ccf19a80 fs: inode split I... |
283 |
list_move(&inode->i_wb_list, dispatch_queue); |
5c03449d3 writeback: move i... |
284 |
} |
2c1365791 writeback: fix ti... |
285 |
} |
e84d0a4f8 writeback: trace ... |
286 287 |
out: return moved; |
2c1365791 writeback: fix ti... |
288 289 290 291 |
} /* * Queue all expired dirty inodes for io, eldest first. |
4ea879b96 writeback: fix qu... |
292 293 294 295 296 297 298 299 |
* 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... |
300 |
*/ |
ad4e38dd6 writeback: send w... |
301 |
static void queue_io(struct bdi_writeback *wb, struct wb_writeback_work *work) |
66f3b8e2e writeback: move d... |
302 |
{ |
e84d0a4f8 writeback: trace ... |
303 |
int moved; |
f758eeabe writeback: split ... |
304 |
assert_spin_locked(&wb->list_lock); |
4ea879b96 writeback: fix qu... |
305 |
list_splice_init(&wb->b_more_io, &wb->b_io); |
ad4e38dd6 writeback: send w... |
306 307 |
moved = move_expired_inodes(&wb->b_dirty, &wb->b_io, work); trace_writeback_queue_io(wb, work, moved); |
66f3b8e2e writeback: move d... |
308 |
} |
a9185b41a pass writeback_co... |
309 |
static int write_inode(struct inode *inode, struct writeback_control *wbc) |
08d8e9749 writeback: fix nt... |
310 |
{ |
03ba3782e writeback: switch... |
311 |
if (inode->i_sb->s_op->write_inode && !is_bad_inode(inode)) |
a9185b41a pass writeback_co... |
312 |
return inode->i_sb->s_op->write_inode(inode, wbc); |
03ba3782e writeback: switch... |
313 |
return 0; |
08d8e9749 writeback: fix nt... |
314 |
} |
08d8e9749 writeback: fix nt... |
315 |
|
2c1365791 writeback: fix ti... |
316 |
/* |
01c031945 cleanup __writeba... |
317 318 |
* Wait for writeback on an inode to complete. */ |
f758eeabe writeback: split ... |
319 320 |
static void inode_wait_for_writeback(struct inode *inode, struct bdi_writeback *wb) |
01c031945 cleanup __writeba... |
321 322 323 324 325 |
{ 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... |
326 327 |
while (inode->i_state & I_SYNC) { spin_unlock(&inode->i_lock); |
f758eeabe writeback: split ... |
328 |
spin_unlock(&wb->list_lock); |
01c031945 cleanup __writeba... |
329 |
__wait_on_bit(wqh, &wq, inode_wait, TASK_UNINTERRUPTIBLE); |
f758eeabe writeback: split ... |
330 |
spin_lock(&wb->list_lock); |
250df6ed2 fs: protect inode... |
331 |
spin_lock(&inode->i_lock); |
58a9d3d8d fs-writeback: che... |
332 |
} |
01c031945 cleanup __writeba... |
333 334 335 |
} /* |
f758eeabe writeback: split ... |
336 |
* Write out an inode's dirty pages. Called under wb->list_lock and |
0f1b1fd86 fs: pull inode->i... |
337 338 |
* inode->i_lock. Either the caller has an active reference on the inode or * the inode has I_WILL_FREE set. |
01c031945 cleanup __writeba... |
339 |
* |
1da177e4c Linux-2.6.12-rc2 |
340 341 342 343 344 |
* If `wait' is set, wait on the writeout. * * The whole writeout design is quite complex and fragile. We want to avoid * starvation of particular inodes when others are being redirtied, prevent * livelocks, etc. |
1da177e4c Linux-2.6.12-rc2 |
345 346 |
*/ static int |
f758eeabe writeback: split ... |
347 348 |
writeback_single_inode(struct inode *inode, struct bdi_writeback *wb, struct writeback_control *wbc) |
1da177e4c Linux-2.6.12-rc2 |
349 |
{ |
1da177e4c Linux-2.6.12-rc2 |
350 |
struct address_space *mapping = inode->i_mapping; |
251d6a471 writeback: trace ... |
351 |
long nr_to_write = wbc->nr_to_write; |
01c031945 cleanup __writeba... |
352 |
unsigned dirty; |
1da177e4c Linux-2.6.12-rc2 |
353 |
int ret; |
f758eeabe writeback: split ... |
354 |
assert_spin_locked(&wb->list_lock); |
0f1b1fd86 fs: pull inode->i... |
355 |
assert_spin_locked(&inode->i_lock); |
01c031945 cleanup __writeba... |
356 357 358 359 360 361 362 363 |
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 this inode is locked for writeback and we are not doing |
66f3b8e2e writeback: move d... |
364 |
* writeback-for-data-integrity, move it to b_more_io so that |
01c031945 cleanup __writeba... |
365 366 367 |
* writeback can proceed with the other inodes on s_io. * * We'll have another go at writing back this inode when we |
66f3b8e2e writeback: move d... |
368 |
* completed a full scan of b_io. |
01c031945 cleanup __writeba... |
369 |
*/ |
a9185b41a pass writeback_co... |
370 |
if (wbc->sync_mode != WB_SYNC_ALL) { |
f758eeabe writeback: split ... |
371 |
requeue_io(inode, wb); |
251d6a471 writeback: trace ... |
372 373 |
trace_writeback_single_inode_requeue(inode, wbc, nr_to_write); |
01c031945 cleanup __writeba... |
374 375 376 377 378 379 |
return 0; } /* * It's a data-integrity sync. We must wait. */ |
f758eeabe writeback: split ... |
380 |
inode_wait_for_writeback(inode, wb); |
01c031945 cleanup __writeba... |
381 |
} |
1c0eeaf56 introduce I_SYNC |
382 |
BUG_ON(inode->i_state & I_SYNC); |
1da177e4c Linux-2.6.12-rc2 |
383 |
|
5547e8aac writeback: Update... |
384 |
/* Set I_SYNC, reset I_DIRTY_PAGES */ |
1c0eeaf56 introduce I_SYNC |
385 |
inode->i_state |= I_SYNC; |
5547e8aac writeback: Update... |
386 |
inode->i_state &= ~I_DIRTY_PAGES; |
250df6ed2 fs: protect inode... |
387 |
spin_unlock(&inode->i_lock); |
f758eeabe writeback: split ... |
388 |
spin_unlock(&wb->list_lock); |
1da177e4c Linux-2.6.12-rc2 |
389 390 |
ret = do_writepages(mapping, wbc); |
26821ed40 make sure data is... |
391 392 393 394 395 |
/* * Make sure to wait on the data before writing out the metadata. * This is important for filesystems that modify metadata on data * I/O completion. */ |
a9185b41a pass writeback_co... |
396 |
if (wbc->sync_mode == WB_SYNC_ALL) { |
26821ed40 make sure data is... |
397 |
int err = filemap_fdatawait(mapping); |
1da177e4c Linux-2.6.12-rc2 |
398 399 400 |
if (ret == 0) ret = err; } |
5547e8aac writeback: Update... |
401 402 403 404 405 |
/* * Some filesystems may redirty the inode during the writeback * due to delalloc, clear dirty metadata flags right before * write_inode() */ |
250df6ed2 fs: protect inode... |
406 |
spin_lock(&inode->i_lock); |
5547e8aac writeback: Update... |
407 408 |
dirty = inode->i_state & I_DIRTY; inode->i_state &= ~(I_DIRTY_SYNC | I_DIRTY_DATASYNC); |
250df6ed2 fs: protect inode... |
409 |
spin_unlock(&inode->i_lock); |
26821ed40 make sure data is... |
410 411 |
/* Don't write the inode if only I_DIRTY_PAGES was set */ if (dirty & (I_DIRTY_SYNC | I_DIRTY_DATASYNC)) { |
a9185b41a pass writeback_co... |
412 |
int err = write_inode(inode, wbc); |
1da177e4c Linux-2.6.12-rc2 |
413 414 415 |
if (ret == 0) ret = err; } |
f758eeabe writeback: split ... |
416 |
spin_lock(&wb->list_lock); |
250df6ed2 fs: protect inode... |
417 |
spin_lock(&inode->i_lock); |
1c0eeaf56 introduce I_SYNC |
418 |
inode->i_state &= ~I_SYNC; |
a4ffdde6e simplify checks f... |
419 |
if (!(inode->i_state & I_FREEING)) { |
94c3dcbb0 writeback: update... |
420 421 422 423 424 425 426 427 |
/* * 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; |
23539afc7 writeback: don't ... |
428 |
if (mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) { |
1da177e4c Linux-2.6.12-rc2 |
429 430 |
/* * We didn't write back all the pages. nfs_writepages() |
a50aeb401 writeback: merge ... |
431 |
* sometimes bales out without doing anything. |
1b43ef91d writeback: fix co... |
432 |
*/ |
a50aeb401 writeback: merge ... |
433 434 |
inode->i_state |= I_DIRTY_PAGES; if (wbc->nr_to_write <= 0) { |
1da177e4c Linux-2.6.12-rc2 |
435 |
/* |
a50aeb401 writeback: merge ... |
436 |
* slice used up: queue for next turn |
1da177e4c Linux-2.6.12-rc2 |
437 |
*/ |
f758eeabe writeback: split ... |
438 |
requeue_io(inode, wb); |
1da177e4c Linux-2.6.12-rc2 |
439 440 |
} else { /* |
a50aeb401 writeback: merge ... |
441 442 443 444 445 |
* 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. |
1da177e4c Linux-2.6.12-rc2 |
446 |
*/ |
f758eeabe writeback: split ... |
447 |
redirty_tail(inode, wb); |
1da177e4c Linux-2.6.12-rc2 |
448 |
} |
23539afc7 writeback: don't ... |
449 450 451 452 453 454 455 |
} 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. */ |
f758eeabe writeback: split ... |
456 |
redirty_tail(inode, wb); |
1da177e4c Linux-2.6.12-rc2 |
457 458 |
} else { /* |
9e38d86ff fs: Implement laz... |
459 460 461 |
* The inode is clean. At this point we either have * a reference to the inode or it's on it's way out. * No need to add it back to the LRU. |
1da177e4c Linux-2.6.12-rc2 |
462 |
*/ |
7ccf19a80 fs: inode split I... |
463 |
list_del_init(&inode->i_wb_list); |
1da177e4c Linux-2.6.12-rc2 |
464 465 |
} } |
1c0eeaf56 introduce I_SYNC |
466 |
inode_sync_complete(inode); |
251d6a471 writeback: trace ... |
467 |
trace_writeback_single_inode(inode, wbc, nr_to_write); |
1da177e4c Linux-2.6.12-rc2 |
468 469 |
return ret; } |
1a12d8bd7 writeback: scale ... |
470 471 |
static long writeback_chunk_size(struct backing_dev_info *bdi, struct wb_writeback_work *work) |
d46db3d58 writeback: make w... |
472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 |
{ 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 ... |
490 491 492 493 494 495 496 |
else { pages = min(bdi->avg_write_bandwidth / 2, global_dirty_limit / DIRTY_SCOPE); pages = min(pages, work->nr_pages); pages = round_down(pages + MIN_WRITEBACK_PAGES, MIN_WRITEBACK_PAGES); } |
d46db3d58 writeback: make w... |
497 498 499 |
return pages; } |
03ba3782e writeback: switch... |
500 |
/* |
f11c9c5c2 vfs: improve writ... |
501 |
* Write a portion of b_io inodes which belong to @sb. |
edadfb10b writeback: split ... |
502 503 |
* * If @only_this_sb is true, then find and write all such |
f11c9c5c2 vfs: improve writ... |
504 505 |
* inodes. Otherwise write only ones which go sequentially * in reverse order. |
edadfb10b writeback: split ... |
506 |
* |
d46db3d58 writeback: make w... |
507 |
* Return the number of pages and/or inodes written. |
f11c9c5c2 vfs: improve writ... |
508 |
*/ |
d46db3d58 writeback: make w... |
509 510 511 |
static long writeback_sb_inodes(struct super_block *sb, struct bdi_writeback *wb, struct wb_writeback_work *work) |
1da177e4c Linux-2.6.12-rc2 |
512 |
{ |
d46db3d58 writeback: make w... |
513 514 515 516 517 518 519 520 521 522 523 524 |
struct writeback_control wbc = { .sync_mode = work->sync_mode, .tagged_writepages = work->tagged_writepages, .for_kupdate = work->for_kupdate, .for_background = work->for_background, .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... |
525 |
while (!list_empty(&wb->b_io)) { |
7ccf19a80 fs: inode split I... |
526 |
struct inode *inode = wb_inode(wb->b_io.prev); |
edadfb10b writeback: split ... |
527 528 |
if (inode->i_sb != sb) { |
d46db3d58 writeback: make w... |
529 |
if (work->sb) { |
edadfb10b writeback: split ... |
530 531 532 533 534 |
/* * 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 ... |
535 |
redirty_tail(inode, wb); |
edadfb10b writeback: split ... |
536 537 538 539 540 541 542 543 |
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... |
544 |
break; |
edadfb10b writeback: split ... |
545 |
} |
9843b76aa fs: skip I_FREEIN... |
546 547 548 549 550 |
/* * Don't bother with new inodes or inodes beeing freed, first * kind does not need peridic writeout yet, and for the latter * kind writeout is handled by the freer. */ |
250df6ed2 fs: protect inode... |
551 |
spin_lock(&inode->i_lock); |
9843b76aa fs: skip I_FREEIN... |
552 |
if (inode->i_state & (I_NEW | I_FREEING | I_WILL_FREE)) { |
250df6ed2 fs: protect inode... |
553 |
spin_unlock(&inode->i_lock); |
fcc5c2221 writeback: don't ... |
554 |
redirty_tail(inode, wb); |
7ef0d7377 fs: new inode i_s... |
555 556 |
continue; } |
1da177e4c Linux-2.6.12-rc2 |
557 |
__iget(inode); |
1a12d8bd7 writeback: scale ... |
558 |
write_chunk = writeback_chunk_size(wb->bdi, work); |
d46db3d58 writeback: make w... |
559 560 |
wbc.nr_to_write = write_chunk; wbc.pages_skipped = 0; |
250df6ed2 fs: protect inode... |
561 |
|
d46db3d58 writeback: make w... |
562 |
writeback_single_inode(inode, wb, &wbc); |
250df6ed2 fs: protect inode... |
563 |
|
d46db3d58 writeback: make w... |
564 565 566 567 568 |
work->nr_pages -= write_chunk - wbc.nr_to_write; wrote += write_chunk - wbc.nr_to_write; if (!(inode->i_state & I_DIRTY)) wrote++; if (wbc.pages_skipped) { |
1da177e4c Linux-2.6.12-rc2 |
569 570 571 572 |
/* * writeback is not making progress due to locked * buffers. Skip this inode for now. */ |
f758eeabe writeback: split ... |
573 |
redirty_tail(inode, wb); |
1da177e4c Linux-2.6.12-rc2 |
574 |
} |
0f1b1fd86 fs: pull inode->i... |
575 |
spin_unlock(&inode->i_lock); |
f758eeabe writeback: split ... |
576 |
spin_unlock(&wb->list_lock); |
1da177e4c Linux-2.6.12-rc2 |
577 |
iput(inode); |
4ffc84442 [PATCH] Move cond... |
578 |
cond_resched(); |
f758eeabe writeback: split ... |
579 |
spin_lock(&wb->list_lock); |
d46db3d58 writeback: make w... |
580 581 582 583 584 585 586 587 588 |
/* * 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 ... |
589 |
} |
1da177e4c Linux-2.6.12-rc2 |
590 |
} |
d46db3d58 writeback: make w... |
591 |
return wrote; |
f11c9c5c2 vfs: improve writ... |
592 |
} |
d46db3d58 writeback: make w... |
593 594 |
static long __writeback_inodes_wb(struct bdi_writeback *wb, struct wb_writeback_work *work) |
f11c9c5c2 vfs: improve writ... |
595 |
{ |
d46db3d58 writeback: make w... |
596 597 |
unsigned long start_time = jiffies; long wrote = 0; |
38f219776 fs: sync_sb_inode... |
598 |
|
f11c9c5c2 vfs: improve writ... |
599 |
while (!list_empty(&wb->b_io)) { |
7ccf19a80 fs: inode split I... |
600 |
struct inode *inode = wb_inode(wb->b_io.prev); |
f11c9c5c2 vfs: improve writ... |
601 |
struct super_block *sb = inode->i_sb; |
9ecc2738a writeback: make t... |
602 |
|
12ad3ab66 superblock: move ... |
603 |
if (!grab_super_passive(sb)) { |
0e995816f don't busy retry ... |
604 605 606 607 608 609 |
/* * grab_super_passive() may fail consistently due to * 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 ... |
610 |
continue; |
f11c9c5c2 vfs: improve writ... |
611 |
} |
d46db3d58 writeback: make w... |
612 |
wrote += writeback_sb_inodes(sb, wb, work); |
edadfb10b writeback: split ... |
613 |
drop_super(sb); |
f11c9c5c2 vfs: improve writ... |
614 |
|
d46db3d58 writeback: make w... |
615 616 617 618 619 620 621 |
/* 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... |
622 |
} |
66f3b8e2e writeback: move d... |
623 |
/* Leave any unwritten inodes on b_io */ |
d46db3d58 writeback: make w... |
624 |
return wrote; |
66f3b8e2e writeback: move d... |
625 |
} |
0e175a183 writeback: Add a ... |
626 627 |
long writeback_inodes_wb(struct bdi_writeback *wb, long nr_pages, enum wb_reason reason) |
edadfb10b writeback: split ... |
628 |
{ |
d46db3d58 writeback: make w... |
629 630 631 632 |
struct wb_writeback_work work = { .nr_pages = nr_pages, .sync_mode = WB_SYNC_NONE, .range_cyclic = 1, |
0e175a183 writeback: Add a ... |
633 |
.reason = reason, |
d46db3d58 writeback: make w... |
634 |
}; |
edadfb10b writeback: split ... |
635 |
|
f758eeabe writeback: split ... |
636 |
spin_lock(&wb->list_lock); |
424b351fe writeback: refill... |
637 |
if (list_empty(&wb->b_io)) |
ad4e38dd6 writeback: send w... |
638 |
queue_io(wb, &work); |
d46db3d58 writeback: make w... |
639 |
__writeback_inodes_wb(wb, &work); |
f758eeabe writeback: split ... |
640 |
spin_unlock(&wb->list_lock); |
edadfb10b writeback: split ... |
641 |
|
d46db3d58 writeback: make w... |
642 643 |
return nr_pages - work.nr_pages; } |
03ba3782e writeback: switch... |
644 |
|
b00949aa2 writeback: per-bd... |
645 |
static bool over_bground_thresh(struct backing_dev_info *bdi) |
03ba3782e writeback: switch... |
646 647 |
{ unsigned long background_thresh, dirty_thresh; |
16c4042f0 writeback: avoid ... |
648 |
global_dirty_limits(&background_thresh, &dirty_thresh); |
03ba3782e writeback: switch... |
649 |
|
b00949aa2 writeback: per-bd... |
650 651 652 653 654 655 656 657 658 |
if (global_page_state(NR_FILE_DIRTY) + global_page_state(NR_UNSTABLE_NFS) > background_thresh) return true; if (bdi_stat(bdi, BDI_RECLAIMABLE) > bdi_dirty_limit(bdi, background_thresh)) return true; return false; |
03ba3782e writeback: switch... |
659 660 661 |
} /* |
e98be2d59 writeback: bdi wr... |
662 663 664 665 666 667 |
* Called under wb->list_lock. If there are multiple wb per bdi, * only the flusher working on the first wb should do it. */ static void wb_update_bandwidth(struct bdi_writeback *wb, unsigned long start_time) { |
af6a31138 writeback: add bg... |
668 |
__bdi_update_bandwidth(wb->bdi, 0, 0, 0, 0, 0, start_time); |
e98be2d59 writeback: bdi wr... |
669 670 671 |
} /* |
03ba3782e writeback: switch... |
672 |
* Explicit flushing or periodic writeback of "old" data. |
66f3b8e2e writeback: move d... |
673 |
* |
03ba3782e writeback: switch... |
674 675 676 677 |
* 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... |
678 |
* |
03ba3782e writeback: switch... |
679 680 681 |
* 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... |
682 |
* |
03ba3782e writeback: switch... |
683 684 |
* 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... |
685 |
*/ |
c4a77a6c7 writeback: make w... |
686 |
static long wb_writeback(struct bdi_writeback *wb, |
83ba7b071 writeback: simpli... |
687 |
struct wb_writeback_work *work) |
66f3b8e2e writeback: move d... |
688 |
{ |
e98be2d59 writeback: bdi wr... |
689 |
unsigned long wb_start = jiffies; |
d46db3d58 writeback: make w... |
690 |
long nr_pages = work->nr_pages; |
03ba3782e writeback: switch... |
691 |
unsigned long oldest_jif; |
a5989bdc9 fs: Fix busyloop ... |
692 |
struct inode *inode; |
d46db3d58 writeback: make w... |
693 |
long progress; |
66f3b8e2e writeback: move d... |
694 |
|
e185dda89 writeback: avoid ... |
695 |
oldest_jif = jiffies; |
d46db3d58 writeback: make w... |
696 |
work->older_than_this = &oldest_jif; |
38f219776 fs: sync_sb_inode... |
697 |
|
e8dfc3058 writeback: elevat... |
698 |
spin_lock(&wb->list_lock); |
03ba3782e writeback: switch... |
699 700 |
for (;;) { /* |
d3ddec763 writeback: stop b... |
701 |
* Stop writeback when nr_pages has been consumed |
03ba3782e writeback: switch... |
702 |
*/ |
83ba7b071 writeback: simpli... |
703 |
if (work->nr_pages <= 0) |
03ba3782e writeback: switch... |
704 |
break; |
66f3b8e2e writeback: move d... |
705 |
|
38f219776 fs: sync_sb_inode... |
706 |
/* |
aa373cf55 writeback: stop b... |
707 708 709 710 711 712 713 714 715 716 |
* 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) && !list_empty(&wb->bdi->work_list)) break; /* |
d3ddec763 writeback: stop b... |
717 718 |
* For background writeout, stop when we are below the * background dirty threshold |
38f219776 fs: sync_sb_inode... |
719 |
*/ |
b00949aa2 writeback: per-bd... |
720 |
if (work->for_background && !over_bground_thresh(wb->bdi)) |
03ba3782e writeback: switch... |
721 |
break; |
38f219776 fs: sync_sb_inode... |
722 |
|
1bc36b642 writeback: Includ... |
723 724 725 726 727 728 |
/* * 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... |
729 730 731 |
if (work->for_kupdate) { oldest_jif = jiffies - msecs_to_jiffies(dirty_expire_interval * 10); |
1bc36b642 writeback: Includ... |
732 733 |
} else if (work->for_background) oldest_jif = jiffies; |
028c2dd18 writeback: Add tr... |
734 |
|
d46db3d58 writeback: make w... |
735 |
trace_writeback_start(wb->bdi, work); |
e8dfc3058 writeback: elevat... |
736 |
if (list_empty(&wb->b_io)) |
ad4e38dd6 writeback: send w... |
737 |
queue_io(wb, work); |
83ba7b071 writeback: simpli... |
738 |
if (work->sb) |
d46db3d58 writeback: make w... |
739 |
progress = writeback_sb_inodes(work->sb, wb, work); |
edadfb10b writeback: split ... |
740 |
else |
d46db3d58 writeback: make w... |
741 742 |
progress = __writeback_inodes_wb(wb, work); trace_writeback_written(wb->bdi, work); |
028c2dd18 writeback: Add tr... |
743 |
|
e98be2d59 writeback: bdi wr... |
744 |
wb_update_bandwidth(wb, wb_start); |
03ba3782e writeback: switch... |
745 746 |
/* |
e6fb6da2e writeback: try mo... |
747 748 749 750 751 752 |
* 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... |
753 |
*/ |
d46db3d58 writeback: make w... |
754 |
if (progress) |
71fd05a88 writeback: improv... |
755 756 |
continue; /* |
e6fb6da2e writeback: try mo... |
757 |
* No more inodes for IO, bail |
71fd05a88 writeback: improv... |
758 |
*/ |
b7a2441f9 writeback: remove... |
759 |
if (list_empty(&wb->b_more_io)) |
03ba3782e writeback: switch... |
760 |
break; |
71fd05a88 writeback: improv... |
761 |
/* |
71fd05a88 writeback: improv... |
762 763 764 765 |
* Nothing written. Wait for some inode to * become available for writeback. Otherwise * we'll just busyloop. */ |
71fd05a88 writeback: improv... |
766 |
if (!list_empty(&wb->b_more_io)) { |
d46db3d58 writeback: make w... |
767 |
trace_writeback_wait(wb->bdi, work); |
7ccf19a80 fs: inode split I... |
768 |
inode = wb_inode(wb->b_more_io.prev); |
250df6ed2 fs: protect inode... |
769 |
spin_lock(&inode->i_lock); |
f758eeabe writeback: split ... |
770 |
inode_wait_for_writeback(inode, wb); |
250df6ed2 fs: protect inode... |
771 |
spin_unlock(&inode->i_lock); |
03ba3782e writeback: switch... |
772 773 |
} } |
e8dfc3058 writeback: elevat... |
774 |
spin_unlock(&wb->list_lock); |
03ba3782e writeback: switch... |
775 |
|
d46db3d58 writeback: make w... |
776 |
return nr_pages - work->nr_pages; |
03ba3782e writeback: switch... |
777 778 779 |
} /* |
83ba7b071 writeback: simpli... |
780 |
* Return the next wb_writeback_work struct that hasn't been processed yet. |
03ba3782e writeback: switch... |
781 |
*/ |
83ba7b071 writeback: simpli... |
782 |
static struct wb_writeback_work * |
08852b6d6 writeback: remove... |
783 |
get_next_work_item(struct backing_dev_info *bdi) |
03ba3782e writeback: switch... |
784 |
{ |
83ba7b071 writeback: simpli... |
785 |
struct wb_writeback_work *work = NULL; |
03ba3782e writeback: switch... |
786 |
|
6467716a3 writeback: optimi... |
787 |
spin_lock_bh(&bdi->wb_lock); |
83ba7b071 writeback: simpli... |
788 789 790 791 |
if (!list_empty(&bdi->work_list)) { work = list_entry(bdi->work_list.next, struct wb_writeback_work, list); list_del_init(&work->list); |
03ba3782e writeback: switch... |
792 |
} |
6467716a3 writeback: optimi... |
793 |
spin_unlock_bh(&bdi->wb_lock); |
83ba7b071 writeback: simpli... |
794 |
return work; |
03ba3782e writeback: switch... |
795 |
} |
cdf01dd54 fs-writeback.c: u... |
796 797 798 799 800 801 802 803 804 805 |
/* * 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) { return global_page_state(NR_FILE_DIRTY) + global_page_state(NR_UNSTABLE_NFS) + get_nr_dirty_inodes(); } |
6585027a5 writeback: integr... |
806 807 |
static long wb_check_background_flush(struct bdi_writeback *wb) { |
b00949aa2 writeback: per-bd... |
808 |
if (over_bground_thresh(wb->bdi)) { |
6585027a5 writeback: integr... |
809 810 811 812 813 814 |
struct wb_writeback_work work = { .nr_pages = LONG_MAX, .sync_mode = WB_SYNC_NONE, .for_background = 1, .range_cyclic = 1, |
0e175a183 writeback: Add a ... |
815 |
.reason = WB_REASON_BACKGROUND, |
6585027a5 writeback: integr... |
816 817 818 819 820 821 822 |
}; return wb_writeback(wb, &work); } return 0; } |
03ba3782e writeback: switch... |
823 824 825 826 |
static long wb_check_old_data_flush(struct bdi_writeback *wb) { unsigned long expired; long nr_pages; |
69b62d01e writeback: disabl... |
827 828 829 830 831 |
/* * When set to zero, disable periodic writeback */ if (!dirty_writeback_interval) return 0; |
03ba3782e writeback: switch... |
832 833 834 835 836 837 |
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... |
838 |
nr_pages = get_nr_dirty_pages(); |
03ba3782e writeback: switch... |
839 |
|
c4a77a6c7 writeback: make w... |
840 |
if (nr_pages) { |
83ba7b071 writeback: simpli... |
841 |
struct wb_writeback_work work = { |
c4a77a6c7 writeback: make w... |
842 843 844 845 |
.nr_pages = nr_pages, .sync_mode = WB_SYNC_NONE, .for_kupdate = 1, .range_cyclic = 1, |
0e175a183 writeback: Add a ... |
846 |
.reason = WB_REASON_PERIODIC, |
c4a77a6c7 writeback: make w... |
847 |
}; |
83ba7b071 writeback: simpli... |
848 |
return wb_writeback(wb, &work); |
c4a77a6c7 writeback: make w... |
849 |
} |
03ba3782e writeback: switch... |
850 851 852 853 854 855 856 857 858 859 |
return 0; } /* * Retrieve work items and do the writeback they describe */ long wb_do_writeback(struct bdi_writeback *wb, int force_wait) { struct backing_dev_info *bdi = wb->bdi; |
83ba7b071 writeback: simpli... |
860 |
struct wb_writeback_work *work; |
c4a77a6c7 writeback: make w... |
861 |
long wrote = 0; |
03ba3782e writeback: switch... |
862 |
|
81d73a32d mm: fix writeback... |
863 |
set_bit(BDI_writeback_running, &wb->bdi->state); |
08852b6d6 writeback: remove... |
864 |
while ((work = get_next_work_item(bdi)) != NULL) { |
03ba3782e writeback: switch... |
865 866 |
/* * Override sync mode, in case we must wait for completion |
83ba7b071 writeback: simpli... |
867 |
* because this thread is exiting now. |
03ba3782e writeback: switch... |
868 869 |
*/ if (force_wait) |
83ba7b071 writeback: simpli... |
870 |
work->sync_mode = WB_SYNC_ALL; |
03ba3782e writeback: switch... |
871 |
|
455b28646 writeback: Initia... |
872 |
trace_writeback_exec(bdi, work); |
83ba7b071 writeback: simpli... |
873 |
wrote += wb_writeback(wb, work); |
03ba3782e writeback: switch... |
874 875 |
/* |
83ba7b071 writeback: simpli... |
876 877 |
* Notify the caller of completion if this is a synchronous * work item, otherwise just free it. |
03ba3782e writeback: switch... |
878 |
*/ |
83ba7b071 writeback: simpli... |
879 880 881 882 |
if (work->done) complete(work->done); else kfree(work); |
03ba3782e writeback: switch... |
883 884 885 886 887 888 |
} /* * Check for periodic writeback, kupdated() style */ wrote += wb_check_old_data_flush(wb); |
6585027a5 writeback: integr... |
889 |
wrote += wb_check_background_flush(wb); |
81d73a32d mm: fix writeback... |
890 |
clear_bit(BDI_writeback_running, &wb->bdi->state); |
03ba3782e writeback: switch... |
891 892 893 894 895 896 897 898 |
return wrote; } /* * Handle writeback of dirty data for the device backed by this bdi. Also * wakes up periodically and does kupdated style flushing. */ |
082439004 writeback: merge ... |
899 |
int bdi_writeback_thread(void *data) |
03ba3782e writeback: switch... |
900 |
{ |
082439004 writeback: merge ... |
901 902 |
struct bdi_writeback *wb = data; struct backing_dev_info *bdi = wb->bdi; |
03ba3782e writeback: switch... |
903 |
long pages_written; |
766f91641 kernel: remove PF... |
904 |
current->flags |= PF_SWAPWRITE; |
082439004 writeback: merge ... |
905 |
set_freezable(); |
ecd584030 writeback: move l... |
906 |
wb->last_active = jiffies; |
082439004 writeback: merge ... |
907 908 909 910 911 |
/* * Our parent may run at a different priority, just set us to normal */ set_user_nice(current, 0); |
455b28646 writeback: Initia... |
912 |
trace_writeback_thread_start(bdi); |
8a32c441c freezer: implemen... |
913 |
while (!kthread_freezable_should_stop(NULL)) { |
6467716a3 writeback: optimi... |
914 915 916 917 918 |
/* * Remove own delayed wake-up timer, since we are already awake * and we'll take care of the preriodic write-back. */ del_timer(&wb->wakeup_timer); |
03ba3782e writeback: switch... |
919 |
pages_written = wb_do_writeback(wb, 0); |
455b28646 writeback: Initia... |
920 |
trace_writeback_pages_written(pages_written); |
03ba3782e writeback: switch... |
921 |
if (pages_written) |
ecd584030 writeback: move l... |
922 |
wb->last_active = jiffies; |
03ba3782e writeback: switch... |
923 |
|
297252c81 writeback: do not... |
924 |
set_current_state(TASK_INTERRUPTIBLE); |
b76b4014f writeback: Fix lo... |
925 |
if (!list_empty(&bdi->work_list) || kthread_should_stop()) { |
f9eadbbd4 writeback: bdi_wr... |
926 |
__set_current_state(TASK_RUNNING); |
297252c81 writeback: do not... |
927 |
continue; |
03ba3782e writeback: switch... |
928 |
} |
253c34e9b writeback: preven... |
929 |
if (wb_has_dirty_io(wb) && dirty_writeback_interval) |
fff5b85aa writeback: move b... |
930 |
schedule_timeout(msecs_to_jiffies(dirty_writeback_interval * 10)); |
253c34e9b writeback: preven... |
931 932 933 934 935 936 |
else { /* * We have nothing to do, so can go sleep without any * timeout and save power. When a work is queued or * something is made dirty - we will be woken up. */ |
297252c81 writeback: do not... |
937 |
schedule(); |
f9eadbbd4 writeback: bdi_wr... |
938 |
} |
03ba3782e writeback: switch... |
939 |
} |
fff5b85aa writeback: move b... |
940 |
/* Flush any work that raced with us exiting */ |
082439004 writeback: merge ... |
941 942 |
if (!list_empty(&bdi->work_list)) wb_do_writeback(wb, 1); |
455b28646 writeback: Initia... |
943 944 |
trace_writeback_thread_stop(bdi); |
03ba3782e writeback: switch... |
945 946 |
return 0; } |
082439004 writeback: merge ... |
947 |
|
03ba3782e writeback: switch... |
948 |
/* |
b8c2f3474 writeback: simpli... |
949 950 |
* Start writeback of `nr_pages' pages. If `nr_pages' is zero, write back * the whole world. |
03ba3782e writeback: switch... |
951 |
*/ |
0e175a183 writeback: Add a ... |
952 |
void wakeup_flusher_threads(long nr_pages, enum wb_reason reason) |
03ba3782e writeback: switch... |
953 |
{ |
b8c2f3474 writeback: simpli... |
954 |
struct backing_dev_info *bdi; |
03ba3782e writeback: switch... |
955 |
|
83ba7b071 writeback: simpli... |
956 957 |
if (!nr_pages) { nr_pages = global_page_state(NR_FILE_DIRTY) + |
b8c2f3474 writeback: simpli... |
958 959 |
global_page_state(NR_UNSTABLE_NFS); } |
03ba3782e writeback: switch... |
960 |
|
b8c2f3474 writeback: simpli... |
961 |
rcu_read_lock(); |
cfc4ba536 writeback: use RC... |
962 |
list_for_each_entry_rcu(bdi, &bdi_list, bdi_list) { |
03ba3782e writeback: switch... |
963 964 |
if (!bdi_has_dirty_io(bdi)) continue; |
0e175a183 writeback: Add a ... |
965 |
__bdi_start_writeback(bdi, nr_pages, false, reason); |
03ba3782e writeback: switch... |
966 |
} |
cfc4ba536 writeback: use RC... |
967 |
rcu_read_unlock(); |
1da177e4c Linux-2.6.12-rc2 |
968 |
} |
03ba3782e writeback: switch... |
969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 |
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 |
998 |
* |
03ba3782e writeback: switch... |
999 1000 1001 1002 1003 1004 1005 1006 1007 |
* 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 |
1008 |
* |
03ba3782e writeback: switch... |
1009 1010 1011 1012 1013 1014 |
* 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 |
1015 |
*/ |
03ba3782e writeback: switch... |
1016 |
void __mark_inode_dirty(struct inode *inode, int flags) |
1da177e4c Linux-2.6.12-rc2 |
1017 |
{ |
03ba3782e writeback: switch... |
1018 |
struct super_block *sb = inode->i_sb; |
253c34e9b writeback: preven... |
1019 |
struct backing_dev_info *bdi = NULL; |
1da177e4c Linux-2.6.12-rc2 |
1020 |
|
03ba3782e writeback: switch... |
1021 1022 1023 1024 1025 1026 |
/* * Don't do this for I_DIRTY_PAGES - that doesn't actually * dirty the inode itself */ if (flags & (I_DIRTY_SYNC | I_DIRTY_DATASYNC)) { if (sb->s_op->dirty_inode) |
aa3857295 fs: pass exact ty... |
1027 |
sb->s_op->dirty_inode(inode, flags); |
03ba3782e writeback: switch... |
1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 |
} /* * make sure that changes are seen by all cpus before we test i_state * -- mikulas */ smp_mb(); /* avoid the locking if we can */ if ((inode->i_state & flags) == flags) return; if (unlikely(block_dump)) block_dump___mark_inode_dirty(inode); |
250df6ed2 fs: protect inode... |
1042 |
spin_lock(&inode->i_lock); |
03ba3782e writeback: switch... |
1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 |
if ((inode->i_state & flags) != flags) { const int was_dirty = inode->i_state & I_DIRTY; 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... |
1054 |
goto out_unlock_inode; |
03ba3782e writeback: switch... |
1055 1056 1057 1058 1059 1060 |
/* * 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... |
1061 |
if (inode_unhashed(inode)) |
250df6ed2 fs: protect inode... |
1062 |
goto out_unlock_inode; |
03ba3782e writeback: switch... |
1063 |
} |
a4ffdde6e simplify checks f... |
1064 |
if (inode->i_state & I_FREEING) |
250df6ed2 fs: protect inode... |
1065 |
goto out_unlock_inode; |
03ba3782e writeback: switch... |
1066 1067 1068 1069 1070 1071 |
/* * 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) { |
a66979aba fs: move i_wb_lis... |
1072 |
bool wakeup_bdi = false; |
253c34e9b writeback: preven... |
1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 |
bdi = inode_to_bdi(inode); if (bdi_cap_writeback_dirty(bdi)) { WARN(!test_bit(BDI_registered, &bdi->state), "bdi-%s not registered ", bdi->name); /* * 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. */ if (!wb_has_dirty_io(&bdi->wb)) wakeup_bdi = true; |
500b067c5 writeback: check ... |
1088 |
} |
03ba3782e writeback: switch... |
1089 |
|
a66979aba fs: move i_wb_lis... |
1090 |
spin_unlock(&inode->i_lock); |
f758eeabe writeback: split ... |
1091 |
spin_lock(&bdi->wb.list_lock); |
03ba3782e writeback: switch... |
1092 |
inode->dirtied_when = jiffies; |
7ccf19a80 fs: inode split I... |
1093 |
list_move(&inode->i_wb_list, &bdi->wb.b_dirty); |
f758eeabe writeback: split ... |
1094 |
spin_unlock(&bdi->wb.list_lock); |
a66979aba fs: move i_wb_lis... |
1095 1096 1097 1098 |
if (wakeup_bdi) bdi_wakeup_thread_delayed(bdi); return; |
1da177e4c Linux-2.6.12-rc2 |
1099 |
} |
1da177e4c Linux-2.6.12-rc2 |
1100 |
} |
250df6ed2 fs: protect inode... |
1101 1102 |
out_unlock_inode: spin_unlock(&inode->i_lock); |
253c34e9b writeback: preven... |
1103 |
|
03ba3782e writeback: switch... |
1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 |
} EXPORT_SYMBOL(__mark_inode_dirty); /* * Write out a superblock's list of dirty inodes. A wait will be performed * upon no inodes, all inodes or the final one, depending upon sync_mode. * * If older_than_this is non-NULL, then only write out inodes which * had their first dirtying at a time earlier than *older_than_this. * |
03ba3782e writeback: switch... |
1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 |
* If `bdi' is non-zero then we're being asked to writeback a specific queue. * This function assumes that the blockdev superblock's inodes are backed by * a variety of queues, so all inodes are searched. For other superblocks, * assume that all inodes are backed by the same queue. * * The inodes to be written are parked on bdi->b_io. They are moved back onto * bdi->b_dirty as they are selected for writing. This way, none can be missed * on the writer throttling path, and we get decent balancing between many * throttled threads: we don't want them all piling up on inode_sync_wait. */ |
b6e51316d writeback: separa... |
1124 |
static void wait_sb_inodes(struct super_block *sb) |
03ba3782e writeback: switch... |
1125 1126 1127 1128 1129 1130 1131 |
{ struct inode *inode, *old_inode = NULL; /* * We need to be protected against the filesystem going from * r/o to r/w or vice versa. */ |
b6e51316d writeback: separa... |
1132 |
WARN_ON(!rwsem_is_locked(&sb->s_umount)); |
03ba3782e writeback: switch... |
1133 |
|
55fa6091d fs: move i_sb_lis... |
1134 |
spin_lock(&inode_sb_list_lock); |
03ba3782e writeback: switch... |
1135 1136 1137 1138 1139 1140 1141 1142 |
/* * 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. */ |
b6e51316d writeback: separa... |
1143 |
list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { |
250df6ed2 fs: protect inode... |
1144 |
struct address_space *mapping = inode->i_mapping; |
03ba3782e writeback: switch... |
1145 |
|
250df6ed2 fs: protect inode... |
1146 1147 1148 1149 |
spin_lock(&inode->i_lock); if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) || (mapping->nrpages == 0)) { spin_unlock(&inode->i_lock); |
03ba3782e writeback: switch... |
1150 |
continue; |
250df6ed2 fs: protect inode... |
1151 |
} |
03ba3782e writeback: switch... |
1152 |
__iget(inode); |
250df6ed2 fs: protect inode... |
1153 |
spin_unlock(&inode->i_lock); |
55fa6091d fs: move i_sb_lis... |
1154 |
spin_unlock(&inode_sb_list_lock); |
03ba3782e writeback: switch... |
1155 |
/* |
55fa6091d fs: move i_sb_lis... |
1156 1157 1158 1159 1160 1161 |
* We hold a reference to 'inode' so it couldn't have been * removed from s_inodes list while we dropped the * inode_sb_list_lock. We cannot iput the inode now as we can * be holding the last reference and we cannot iput it under * inode_sb_list_lock. So we keep the reference and iput it * later. |
03ba3782e writeback: switch... |
1162 1163 1164 1165 1166 1167 1168 |
*/ iput(old_inode); old_inode = inode; filemap_fdatawait(mapping); cond_resched(); |
55fa6091d fs: move i_sb_lis... |
1169 |
spin_lock(&inode_sb_list_lock); |
03ba3782e writeback: switch... |
1170 |
} |
55fa6091d fs: move i_sb_lis... |
1171 |
spin_unlock(&inode_sb_list_lock); |
03ba3782e writeback: switch... |
1172 |
iput(old_inode); |
1da177e4c Linux-2.6.12-rc2 |
1173 |
} |
d8a8559cd writeback: get ri... |
1174 |
/** |
3259f8bed Add new functions... |
1175 |
* writeback_inodes_sb_nr - writeback dirty inodes from given super_block |
d8a8559cd writeback: get ri... |
1176 |
* @sb: the superblock |
3259f8bed Add new functions... |
1177 |
* @nr: the number of pages to write |
786228ab3 writeback: Fix is... |
1178 |
* @reason: reason why some writeback work initiated |
1da177e4c Linux-2.6.12-rc2 |
1179 |
* |
d8a8559cd writeback: get ri... |
1180 1181 |
* 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 |
3259f8bed Add new functions... |
1182 |
* for IO completion of submitted IO. |
1da177e4c Linux-2.6.12-rc2 |
1183 |
*/ |
0e175a183 writeback: Add a ... |
1184 1185 1186 |
void writeback_inodes_sb_nr(struct super_block *sb, unsigned long nr, enum wb_reason reason) |
1da177e4c Linux-2.6.12-rc2 |
1187 |
{ |
83ba7b071 writeback: simpli... |
1188 1189 |
DECLARE_COMPLETION_ONSTACK(done); struct wb_writeback_work work = { |
6e6938b6d writeback: introd... |
1190 1191 1192 1193 1194 |
.sb = sb, .sync_mode = WB_SYNC_NONE, .tagged_writepages = 1, .done = &done, .nr_pages = nr, |
0e175a183 writeback: Add a ... |
1195 |
.reason = reason, |
3c4d71653 writeback: queue ... |
1196 |
}; |
d8a8559cd writeback: get ri... |
1197 |
|
cf37e9724 writeback: enforc... |
1198 |
WARN_ON(!rwsem_is_locked(&sb->s_umount)); |
83ba7b071 writeback: simpli... |
1199 1200 |
bdi_queue_work(sb->s_bdi, &work); wait_for_completion(&done); |
e913fc825 writeback: fix WB... |
1201 |
} |
3259f8bed Add new functions... |
1202 1203 1204 1205 1206 |
EXPORT_SYMBOL(writeback_inodes_sb_nr); /** * writeback_inodes_sb - writeback dirty inodes from given super_block * @sb: the superblock |
786228ab3 writeback: Fix is... |
1207 |
* @reason: reason why some writeback work was initiated |
3259f8bed Add new functions... |
1208 1209 1210 1211 1212 |
* * 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 ... |
1213 |
void writeback_inodes_sb(struct super_block *sb, enum wb_reason reason) |
3259f8bed Add new functions... |
1214 |
{ |
0e175a183 writeback: Add a ... |
1215 |
return writeback_inodes_sb_nr(sb, get_nr_dirty_pages(), reason); |
3259f8bed Add new functions... |
1216 |
} |
0e3c9a228 Revert "writeback... |
1217 |
EXPORT_SYMBOL(writeback_inodes_sb); |
e913fc825 writeback: fix WB... |
1218 1219 |
/** |
17bd55d03 fs-writeback: Add... |
1220 1221 |
* writeback_inodes_sb_if_idle - start writeback if none underway * @sb: the superblock |
786228ab3 writeback: Fix is... |
1222 |
* @reason: reason why some writeback work was initiated |
17bd55d03 fs-writeback: Add... |
1223 1224 1225 1226 |
* * Invoke writeback_inodes_sb if no writeback is currently underway. * Returns 1 if writeback was started, 0 if not. */ |
0e175a183 writeback: Add a ... |
1227 |
int writeback_inodes_sb_if_idle(struct super_block *sb, enum wb_reason reason) |
17bd55d03 fs-writeback: Add... |
1228 1229 |
{ if (!writeback_in_progress(sb->s_bdi)) { |
cf37e9724 writeback: enforc... |
1230 |
down_read(&sb->s_umount); |
0e175a183 writeback: Add a ... |
1231 |
writeback_inodes_sb(sb, reason); |
cf37e9724 writeback: enforc... |
1232 |
up_read(&sb->s_umount); |
17bd55d03 fs-writeback: Add... |
1233 1234 1235 1236 1237 1238 1239 |
return 1; } else return 0; } EXPORT_SYMBOL(writeback_inodes_sb_if_idle); /** |
3259f8bed Add new functions... |
1240 1241 1242 |
* writeback_inodes_sb_if_idle - start writeback if none underway * @sb: the superblock * @nr: the number of pages to write |
786228ab3 writeback: Fix is... |
1243 |
* @reason: reason why some writeback work was initiated |
3259f8bed Add new functions... |
1244 1245 1246 1247 1248 |
* * Invoke writeback_inodes_sb if no writeback is currently underway. * Returns 1 if writeback was started, 0 if not. */ int writeback_inodes_sb_nr_if_idle(struct super_block *sb, |
0e175a183 writeback: Add a ... |
1249 1250 |
unsigned long nr, enum wb_reason reason) |
3259f8bed Add new functions... |
1251 1252 1253 |
{ if (!writeback_in_progress(sb->s_bdi)) { down_read(&sb->s_umount); |
0e175a183 writeback: Add a ... |
1254 |
writeback_inodes_sb_nr(sb, nr, reason); |
3259f8bed Add new functions... |
1255 1256 1257 1258 1259 1260 1261 1262 |
up_read(&sb->s_umount); return 1; } else return 0; } EXPORT_SYMBOL(writeback_inodes_sb_nr_if_idle); /** |
d8a8559cd writeback: get ri... |
1263 1264 1265 1266 |
* sync_inodes_sb - sync sb inode pages * @sb: the superblock * * This function writes and waits on any dirty inode belonging to this |
cb9ef8d5e fs/fs-writeback.c... |
1267 |
* super_block. |
d8a8559cd writeback: get ri... |
1268 |
*/ |
b6e51316d writeback: separa... |
1269 |
void sync_inodes_sb(struct super_block *sb) |
d8a8559cd writeback: get ri... |
1270 |
{ |
83ba7b071 writeback: simpli... |
1271 1272 |
DECLARE_COMPLETION_ONSTACK(done); struct wb_writeback_work work = { |
3c4d71653 writeback: queue ... |
1273 1274 1275 1276 |
.sb = sb, .sync_mode = WB_SYNC_ALL, .nr_pages = LONG_MAX, .range_cyclic = 0, |
83ba7b071 writeback: simpli... |
1277 |
.done = &done, |
0e175a183 writeback: Add a ... |
1278 |
.reason = WB_REASON_SYNC, |
3c4d71653 writeback: queue ... |
1279 |
}; |
cf37e9724 writeback: enforc... |
1280 |
WARN_ON(!rwsem_is_locked(&sb->s_umount)); |
83ba7b071 writeback: simpli... |
1281 1282 |
bdi_queue_work(sb->s_bdi, &work); wait_for_completion(&done); |
b6e51316d writeback: separa... |
1283 |
wait_sb_inodes(sb); |
1da177e4c Linux-2.6.12-rc2 |
1284 |
} |
d8a8559cd writeback: get ri... |
1285 |
EXPORT_SYMBOL(sync_inodes_sb); |
1da177e4c Linux-2.6.12-rc2 |
1286 |
|
1da177e4c Linux-2.6.12-rc2 |
1287 |
/** |
7f04c26d7 [PATCH] fix nr_un... |
1288 1289 1290 1291 1292 1293 |
* 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 |
1294 |
* |
7f04c26d7 [PATCH] fix nr_un... |
1295 |
* The caller must either have a ref on the inode or must have set I_WILL_FREE. |
1da177e4c Linux-2.6.12-rc2 |
1296 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
1297 1298 |
int write_inode_now(struct inode *inode, int sync) { |
f758eeabe writeback: split ... |
1299 |
struct bdi_writeback *wb = &inode_to_bdi(inode)->wb; |
1da177e4c Linux-2.6.12-rc2 |
1300 1301 1302 |
int ret; struct writeback_control wbc = { .nr_to_write = LONG_MAX, |
18914b188 write_inode_now()... |
1303 |
.sync_mode = sync ? WB_SYNC_ALL : WB_SYNC_NONE, |
111ebb6e6 [PATCH] writeback... |
1304 1305 |
.range_start = 0, .range_end = LLONG_MAX, |
1da177e4c Linux-2.6.12-rc2 |
1306 1307 1308 |
}; if (!mapping_cap_writeback_dirty(inode->i_mapping)) |
49364ce25 [PATCH] write_ino... |
1309 |
wbc.nr_to_write = 0; |
1da177e4c Linux-2.6.12-rc2 |
1310 1311 |
might_sleep(); |
f758eeabe writeback: split ... |
1312 |
spin_lock(&wb->list_lock); |
0f1b1fd86 fs: pull inode->i... |
1313 |
spin_lock(&inode->i_lock); |
f758eeabe writeback: split ... |
1314 |
ret = writeback_single_inode(inode, wb, &wbc); |
0f1b1fd86 fs: pull inode->i... |
1315 |
spin_unlock(&inode->i_lock); |
f758eeabe writeback: split ... |
1316 |
spin_unlock(&wb->list_lock); |
1da177e4c Linux-2.6.12-rc2 |
1317 |
if (sync) |
1c0eeaf56 introduce I_SYNC |
1318 |
inode_sync_wait(inode); |
1da177e4c Linux-2.6.12-rc2 |
1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 |
return ret; } 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) { |
f758eeabe writeback: split ... |
1336 |
struct bdi_writeback *wb = &inode_to_bdi(inode)->wb; |
1da177e4c Linux-2.6.12-rc2 |
1337 |
int ret; |
f758eeabe writeback: split ... |
1338 |
spin_lock(&wb->list_lock); |
0f1b1fd86 fs: pull inode->i... |
1339 |
spin_lock(&inode->i_lock); |
f758eeabe writeback: split ... |
1340 |
ret = writeback_single_inode(inode, wb, wbc); |
0f1b1fd86 fs: pull inode->i... |
1341 |
spin_unlock(&inode->i_lock); |
f758eeabe writeback: split ... |
1342 |
spin_unlock(&wb->list_lock); |
1da177e4c Linux-2.6.12-rc2 |
1343 1344 1345 |
return ret; } EXPORT_SYMBOL(sync_inode); |
c37650161 fs: add sync_inod... |
1346 1347 |
/** |
c691b9d98 sync_inode_metada... |
1348 |
* sync_inode_metadata - write an inode to disk |
c37650161 fs: add sync_inod... |
1349 1350 1351 |
* @inode: the inode to sync * @wait: wait for I/O to complete. * |
c691b9d98 sync_inode_metada... |
1352 |
* Write an inode to disk and adjust its dirty state after completion. |
c37650161 fs: add sync_inod... |
1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 |
* * 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); |