blk_account_io_start

Name:blk_account_io_start

Proto:void blk_account_io_start(struct request *rq, bool new_io)

Type:void

Parameter:

Type	Parameter	Name
struct request *	rq
bool	new_io

1356

rw = rq_data_dir(rq)

1358

If Not Contribute to IO statistics IFF:* a) it's attached to a gendisk, and* b) the queue had IO stats enabled when this request was started Then Return

1361

Macros to operate on percpu disk statistics:* {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters* and should be called between disk_stat_lock() and* disk_stat_unlock()()

1363

If Not new_io Then

1364

1365

part_stat_inc(part, merges[rw])

1366

Else

1367

part = disk_map_sector_rcu(rq_disk, lk_rq_pos() : the current sector* blk_rq_bytes() : bytes left in the entire request* blk_rq_cur_bytes() : bytes left in the current segment* blk_rq_err_bytes() : bytes left till the next error boundary* blk_rq_sectors() : sectors left in the entire )

1368

If Not hd_struct_try_get(part) Then

1377

1378

hd_struct_get(part)

1380

part_inc_in_flight(q, part, rw)

1381

1384

update_io_ticks(part, jiffies)

1386

part_stat_unlock()

**Caller**
Name	Describe
bio_attempt_back_merge
bio_attempt_front_merge
bio_attempt_discard_merge
blk_insert_cloned_request	lk_insert_cloned_request - Helper for stacking drivers to submit a request@q: the queue to submit the request@rq: the request being queued
blk_execute_rq_nowait	lk_execute_rq_nowait - insert a request into queue for execution@q: queue to insert the request in@bd_disk: matching gendisk@rq: request to insert@at_head: insert request at head or tail of queue@done: I/O completion handler Description:* Insert a
blk_mq_bio_to_request

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