函数逻辑报告 |
Source Code:fs\direct-io.c |
Create Date:2022-07-29 10:46:36 |
Last Modify:2020-03-12 14:18:49 | Copyright©Brick |
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函数名称:Walk the user pages, and the file, mapping blocks to disk and generating* a sequence of (page,offset,len,block) mappings. These mappings are injected* into submit_page_section(), which takes care of the next stage of submission
函数原型:static int do_direct_IO(struct dio *dio, struct dio_submit *sdio, struct buffer_head *map_bh)
返回类型:int
参数:
类型 | 参数 | 名称 |
---|---|---|
struct dio * | dio | |
struct dio_submit * | sdio | |
struct buffer_head * | map_bh |
946 | blkbits等于doesn't change |
947 | i_blkbits等于blkbits加When we're using an alignment whichis finer than the filesystem's softblocksize, this specifies how muchfiner. blkfactor=2 means 1/4-blockalignment. Does not change |
948 | ret等于0 |
955 | 如果是错误则 |
959 | from等于如果xt page to process 则0否则from |
960 | to等于如果xt page to process 恒等于last valid page + 1 减1则to否则PAGE_SIZE |
961 | xt page to process 自加 |
968 | 如果At block_in_file. changes 恒等于0则 |
976 | 如果ret则 |
978 | 转到:out |
980 | 如果非buffer_mapped(map_bh)则转到:do_holes |
983 | At block_in_file. changes 等于 size of mapping 右移blkbits位 |
987 | 如果buffer_new(map_bh)则 |
994 | 如果非When we're using an alignment whichis finer than the filesystem's softblocksize, this specifies how muchfiner. blkfactor=2 means 1/4-blockalignment. Does not change 则转到:do_holes |
1015 | do_holes : |
1017 | 如果非buffer_mapped(map_bh)则 |
1021 | 如果op恒等于REQ_OP_WRITE则 |
1023 | 返回:负ENOTBLK |
1036 | 转到:out |
1042 | 转到:next_block |
1059 | 如果this_chunk_blocks大于u则this_chunk_blocks等于u |
1062 | 如果this_chunk_blocks大于u则this_chunk_blocks等于u |
1064 | this_chunk_bytes等于this_chunk_blocks左移blkbits位 |
1065 | BUG_ON(this_chunk_bytes == 0) |
1067 | 如果this_chunk_blocks恒等于At block_in_file. changes 则prev block is at a boundary 等于buffer_boundary(map_bh) |
1074 | 如果ret则 |
1076 | 转到:out |
1081 | from加等于this_chunk_bytes |
1082 | IO result 加等于this_chunk_bytes |
1084 | next_block : |
1093 | out : |
1094 | 返回:ret |
名称 | 描述 |
---|---|
do_blockdev_direct_IO | This is a library function for use by filesystem drivers |
源代码转换工具 开放的插件接口 | X |
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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 |