Hello, On Mon 04-08-14 10:20:35, Sankar P wrote: > I have a simple filesystem that I did for learning purpose > https://github.com/psankar/simplefs > > Now, I would like to add a few settings to my filesystem (such as the > number of blocks that should be allocated in an extent by default, > maximum fragmentation score after which defrag should be automatically > handled etc.) I would like to have the ability to not just set these > settings, but export them to a file and restore these settings later. > Is there some kind of a settings infrastructure code that is available > in the linux kernel or should I be developing something specific to my > filesystem ? > > I would also like to have some kind of validation system also as part > of the settings interface. For example: If a setting can accept only > ints, trying to set a string to that should be disabled, min and max > values (range) for values of settings, etc. > > I googled and found that sysctl interface and the sysfs interfaces > seem to be doing something similar. But I was not sure which to pick > as the wikipedia pages were not as elaborate as I would like. > > So my question is: Is there a settings infrastructure provided by the > linux kernel and is any filesystem (or any other kernel components) > that make use of such a settings infrastrucutre ? Yes, sysfs or debugfs is the right interface. You can have a look at e.g. ext4 which handles quite some sysfs attributes in fs/ext4/super.c (look at ext4_ktype and structures and functions referenced from there). Honza -- Jan Kara <jack@xxxxxxx> SUSE Labs, CR _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
