debugfs_use_file_start — mark the beginning of file data access
int debugfs_use_file_start ( | const struct dentry * dentry, |
int * srcu_idx); |
dentrythe dentry object whose data is being accessed.
srcu_idxa pointer to some memory to store a SRCU index in.
Up to a matching call to debugfs_use_file_finish, any
successive call into the file removing functions debugfs_remove
and debugfs_remove_recursive will block. Since associated private
file data may only get freed after a successful return of any of
the removal functions, you may safely access it after a successful
call to debugfs_use_file_start without worrying about
lifetime issues.
If -EIO is returned, the file has already been removed and thus,
it is not safe to access any of its data. If, on the other hand,
it is allowed to access the file data, zero is returned.
Regardless of the return code, any call to
debugfs_use_file_start must be followed by a matching call
to debugfs_use_file_finish.