函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:mm\backing-dev.c Create Date:2022-07-27 15:48:06
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：read_ahead_kb_store

函数原型：static ssize_t read_ahead_kb_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)

返回类型：ssize_t

参数：

类型参数名称
struct device *dev
struct device_attribute *attr
const char *buf
size_tcount
139  bdi等于dev_get_drvdata(dev)
143  ret等于kstrtoul - convert a string to an unsigned long*@s: The start of the string. The string must be null-terminated, and may also* include a single newline before its terminating null. The first character* may also be a plus sign, but not a minus sign.
144  如果ret小于0则返回:ret
147  max readahead in PAGE_SIZE units 等于read_ahead_kb右移PAGE_SHIFT determines the page size 减10位
149  返回:count