Jan. 19, 2011
7:23 a.m.
I would like to maintain some filesystem metadata as an on-disk datastructure that can be read and written to from within the filesystem module. I know file access from within the kernel is a bad idea; what is the recommended alternative for this? I'm thinking of reserving a bunch of blocks at the start of the partition and accessing them directly - is this the right approach? I'm not too sure how to do that either - I figured the way that ext3 maintains its journal would provide a hint, but I can find no documentation on this, and the code is hard to trace through for this one specific thing. martin