setup_swap_extents

函数名称：A `swap extent' is a simple thing which maps a contiguous range of pages* onto a contiguous range of disk blocks. An ordered list of swap extents* is built at swapon time and is then used at swap_writepage/swap_readpage

函数原型：static int setup_swap_extents(struct swap_info_struct *sis, sector_t *span)

返回类型：int

参数：

类型	参数	名称
struct swap_info_struct *	sis
sector_t *	span

2383

swap_file等于seldom referenced

2384

mapping等于f_mapping

2385

inode等于host

2388

如果S_ISBLK(i_mode)则

2389

ret等于Add a block range (and the corresponding page range) into this swapdev's* extent tree.* This function rather assumes that it is called in ascending page order.

2390

span等于al of usable pages of swap

2391

返回:ret

2394

如果swap_activate则

2395

ret等于swap_activate(sis, swap_file, span)

2396

如果ret大于等于0则SWP_USED etc: see above 或等于SWP_ACTIVATED

2398

如果非ret则

2399

SWP_USED etc: see above 或等于SWP_FS

2400

ret等于Add a block range (and the corresponding page range) into this swapdev's* extent tree.* This function rather assumes that it is called in ascending page order.

2401

span等于al of usable pages of swap

2403

返回:ret

2406

返回:generic_swapfile_activate(sis, swap_file, span)

**调用者**
名称	描述
setup_swap_map_and_extents

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