函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:fs\file_table.c Create Date:2022-07-29 10:31:54
Last Modify:2020-03-18 10:20:10 Copyright©Brick
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函数名称：Find an unused file structure and return a pointer to it

函数原型：struct file *alloc_empty_file(int flags, const struct cred *cred)

返回类型：struct file

参数：

类型参数名称
intflags
const struct cred *cred
142  如果Return the total number of open files in the system大于等于unable 且非操作权限检查则
147  如果percpu_counter_sum_positive( & nr_files)大于等于unable 则转到:over
151  f等于__alloc_file(flags, cred)
152  如果非是错误则percpu_counter_inc( & nr_files)
155  返回:f
157  over :
159  如果Return the total number of open files in the system大于old_max则
160  打印信息("VFS: file-max limit %lu reached\n", Return the maximum number of open files in the system)
161  old_max等于Return the total number of open files in the system
163  返回:错误号
调用者
名称描述
alloc_filealloc_file - allocate and initialize a 'struct file'*@path: the (dentry, vfsmount) pair for the new file*@flags: O_... flags with which the new file will be opened*@fop: the 'struct file_operations' for the new file
path_openat