函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:block\genhd.c Create Date:2022-07-27 18:54:38
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：blk_lookup_devt

函数原型：dev_t blk_lookup_devt(const char *name, int partno)

返回类型：dev_t

参数：

类型参数名称
const char *name
intpartno
1435  devt等于MKDEV(0, 0)
1439  class_dev_iter_init( & iter, & block_class, NULL, & disk_type)
1440  当dev等于class_dev_iter_next( & iter)循环
1441  disk等于dev_to_disk(dev)
1444  如果字符串比较则继续下一循环
1447  如果partno小于 maximum number of minors, =1 for * disks that can't be partitioned. 则
1451  devt等于MKDEV(MAJOR( dev_t, creates the sysfs "dev" ), MINOR( dev_t, creates the sysfs "dev" ) + partno)
1453  退出
1455  part等于disk_get_part - get partition*@disk: disk to look partition from*@partno: partition number* Look for partition @partno from @disk. If found, increment* reference count and return it.* CONTEXT:* Don't care.* RETURNS:
1456  如果part则
1457  devt等于part_devt(part)
1458  disk_put_part(part)
1459  退出
1461  disk_put_part(part)
1463  class_dev_iter_exit( & iter)
1464  返回:devt
调用者
名称描述
name_to_dev_tConvert a name into device number