wb_init

函数名称：wb_init

函数原型：static int wb_init(struct bdi_writeback *wb, struct backing_dev_info *bdi, int blkcg_id, gfp_t gfp)

返回类型：int

参数：

类型	参数	名称
struct bdi_writeback *	wb
struct backing_dev_info *	bdi
int	blkcg_id
gfp_t	gfp

289

memset(wb, 0, wb的长度)

291

如果wb不等于 the root writeback info for this bdi 则bdi_get(bdi)

293

ur parent bdi 等于bdi

294

last old data flush 等于jiffies

295

296

297

298

299

spin_lock_init( & protects the b_* lists )

301

last time write bw is updated 等于jiffies

302

balanced_dirty_ratelimit等于Initial write bandwidth: 100 MB/s

303

The base dirty throttle rate, re-calculated on every 200ms.* All the bdi tasks' dirty rate will be curbed under it.*@dirty_ratelimit tracks the estimated @balanced_dirty_ratelimit* in small steps and is much more smooth/stable than the latter.等于Initial write bandwidth: 100 MB/s

304

he estimated write bandwidth 等于Initial write bandwidth: 100 MB/s

305

urther smoothed write bw, > 0 等于Initial write bandwidth: 100 MB/s

307

spin_lock_init( & protects work_list & dwork scheduling )

308

初始化链表头

309

INIT_DELAYED_WORK( & work item used for writeback , Handle writeback of dirty data for the device backed by this bdi. Also* reschedules periodically and does kupdated style flushing.)

310

last wait 等于jiffies

312

congested等于wb_congested_get_create(bdi, blkcg_id, gfp)

313

如果非congested则

314

err等于负ENOMEM

315

转到:out_put_bdi

318

err等于fprop_local_init_percpu( & completions, gfp)

319

如果err则转到:out_put_cong

322

以i小于NR_WB_STAT_ITEMS 循环

323

err等于percpu_counter_init( & stat[i], 0, gfp)

324

如果err则转到:out_destroy_stat

328

返回:0

330

out_destroy_stat :

331

当i自减循环

332

percpu_counter_destroy( & stat[i])

333

fprop_local_destroy_percpu( & completions)

334

out_put_cong :

335

wb_congested_put(congested)

336

out_put_bdi :

337

如果wb不等于 the root writeback info for this bdi 则bdi_put(bdi)

339

返回:err

**调用者**
名称	描述
cgwb_bdi_init

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