dio_new_bio

Name:There is no bio. Make one now.

Proto:static inline int dio_new_bio(struct dio *dio, struct dio_submit *sdio, sector_t start_sector, struct buffer_head *map_bh)

Type:int

Parameter:

Type	Parameter	Name
struct dio *	dio
struct dio_submit *	sdio
sector_t	start_sector
struct buffer_head *	map_bh

711

ret = A really large O_DIRECT read or write can generate a lot of BIOs. So* to keep the memory consumption sane we periodically reap any completed BIOs* during the BIO generation phase.* This also helps to limit the peak amount of pinned userspace memory.

712

If ret Then Go to out

714

sector = start_sector << doesn't change - 9

715

nr_pages = min - return minimum of two values of the same or compatible types*@x: first value*@y: second value(approximate total IO pages , BIO_MAX_PAGES)

716

BUG_ON(nr_pages <= 0)

717

dio_bio_alloc(dio, sdio, b_bdev, sector, nr_pages)

718

prev block is at a boundary = 0

719

out :

720

Return ret

**Caller**
Name	Describe
dio_send_cur_page	Put cur_page under IO

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