Hello everyone, I am trying to create a debugfs file for exposing some information to the userspace. (I am exploring on how to use debugfs)
From the documentation (Documentation/filesystems/debugfs.txt), i came across a function called
struct dentry *debugfs_create_file_size(...,loff_t file_size); This essentially creates a file with an initial size. I want to write in this file, how should i be accessing the space created from previous function call. I have looked through the source code, but i have found very few places where this function is used. In one of the use cases [0], the memory equal to the size is allocated in the open file operation, and the private_data member is pointed to this. (Looking at [0] helps in understanding this). But from #kernelnewbies channel, i found that private_data is a pointer for tty/char drivers. Thanks for the help. [0]: https://elixir.bootlin.com/linux/latest/source/drivers/usb/gadget/udc/atmel_... ymdatta.