Vector::ensure_capacity() makes sure the underlying vector buffer can
contain all the data, but it doesn't update the Vector::size().
As a result, writev() would simply collect all the buffers to write,
and then do nothing.
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.
Also don't uncache inodes when they reach i_links_count==0 unless they
also have no ref counts other than the +1 from the inode cache.
This prevents the FS from deleting the on-disk inode too soon.
