bvec_split

函数名称：vec_split_segs - verify whether or not a bvec should be split in the middle*@q: [in] request queue associated with the bio associated with @bv*@bv: [in] bvec to examine*@nsegs: [in,out] Number of segments in the bio being built

函数原型：static bool bvec_split_segs(const struct request_queue *q, const struct bio_vec *bv, unsigned *nsegs, unsigned *sectors, unsigned max_segs, unsigned max_sectors)

返回类型：bool

参数：

类型	参数	名称
const struct request_queue *	q
const struct bio_vec *	bv
unsigned *	nsegs
unsigned *	sectors
unsigned	max_segs
unsigned	max_sectors

201

max_len等于两数取小(max_sectors, UINT_MAX >> 9)减sectors左移9位

202

len等于两数取小(bv_len, max_len)

203

total_len等于0

204

seg_size等于0

206

当len且nsegs小于max_segs 循环

207

seg_size等于get_max_segment_size(q, bv_page, bv_offset + total_len)

209

seg_size等于两数取小(seg_size, len)

211

nsegs自加

212

total_len加等于seg_size

213

len减等于seg_size

215

如果bv_offset加total_len按位与queue_virt_boundary(q)则退出

219

sectors加等于total_len右移9位

222

返回:len大于0或bv_len大于max_len

**调用者**
名称	描述
blk_bio_segment_split	lk_bio_segment_split - split a bio in two bios@q: [in] request queue pointer@bio: [in] bio to be split@bs: [in] bio set to allocate the clone from@segs: [out] number of segments in the bio with the first half of the sectors* Clone @bio, update the
blk_recalc_rq_segments

源代码转换工具开放的插件接口	X
支持：c/c++/esqlc/java Oracle/Informix/Mysql 插件可实现：逻辑报告代码生成和批量转换代码

函数逻辑报告