As suggested by Joshua, this commit adds the 2-clause BSD license as a
comment block to the top of every source file.
For the first pass, I've just added myself for simplicity. I encourage
everyone to add themselves as copyright holders of any file they've
added or modified in some significant way. If I've added myself in
error somewhere, feel free to replace it with the appropriate copyright
holder instead.
Going forward, all new source files should include a license header.
As Sergey pointed out, it's silly to have proper entries for . and ..
in TmpFS when we can just synthesize them on the fly.
Note that we have to tolerate removal of . and .. via remove_child()
to keep VFS::rmdir() happy.
We were running without the sticky bit and mode 777, which meant that
the /tmp directory was world-writable *without* protection.
With this fixed, it's no longer possible for everyone to steal root's
files in /tmp.
If we're creating something that should have a different owner than the
current process's UID/GID, we need to plumb that all the way through
VFS down to the FS functions.
- TmpFSInode::write_bytes() needs to allow non-zero offsets
- TmpFSInode::read_bytes() wasn't respecting the offset
GCC puts the temporary files generated during compilation in /tmp,
so this exposed some bugs in TmpFS.
