AdminXVII authored 5 years ago and Jeremy Soller committed 5 years ago

Add the atime field, which tracks the last access time. Only reads
update the atime.

**BREAKING CHANGE**: One less extent available per block, 4 more bytes
for node names.

According to `man open`:

> The file is opened in append mode. Before each write(2), the file offset
is positioned at the end of the file, as if with lseek(2). The modi‐
fication of the file offset and the write operation are performed as a
single atomic step.

Cleanup to allow use of most functions when linking the library, including mounting and creating filesystems