07-13-2010
That is correct. (You agreed not to bump threads when you registered, by the way.)
Your question is a bit vague, is the problem. Linux supports dozens of very different filesystems, so the answer to your question is going to be different for every single one. If you wanted to pick a 'standard' one to research into the ground,
ext2 would probably be the most used and best documented. ext3 is just journalling extensions on ext2.
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LEARN ABOUT CENTOS
debugfs_create_file
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
name
a pointer to a string containing the name of the file to create.
mode
the permission that the file should have.
parent
a pointer to the parent dentry for this file. This should be a directory dentry if set. If this paramater is NULL, then the file will
be created in the root of the debugfs filesystem.
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.
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
Kernel Hackers Manual 3.10 June 2014 DEBUGFS_CREATE_FILE(9)