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DEBUGFS_CREATE_FILE(9) The debugfs filesystem DEBUGFS_CREATE_FILE(9)

NAME

debugfs_create_file - create a file in the debugfs filesystem

SYNOPSIS

struct dentry * debugfs_create_file(const char * name, umode_t mode, struct dentry * parent, void * data, const struct file_operations * fops);

ARGUMENTS

const char * name

a pointer to a string containing the name of the file to create.

umode_t mode

the permission that the file should have.

struct dentry * parent

a pointer to the parent dentry for this file. This should be a directory dentry if set. If this parameter is NULL, then the file will be created in the root of the debugfs filesystem.

void * data

a pointer to something that the caller will want to get to later on. The inode.i_private pointer will point to this value on the open call.

const struct file_operations * fops

a pointer to a struct file_operations that should be used for this file.

DESCRIPTION

This is the basic “create a file” function for debugfs. It allows for a wide range of flexibility in creating a file, or a directory (if you want to create a directory, the debugfs_create_dir function is recommended to be used instead.)

This function will return a pointer to a dentry if it succeeds. This pointer must be passed to the debugfs_remove function when the file is to be removed (no automatic cleanup happens if your module is unloaded, you are responsible here.) If an error occurs, NULL will be returned.

If debugfs is not enabled in the kernel, the value -ENODEV will be returned.

COPYRIGHT

July 2017 Kernel Hackers Manual 4.12