11 May
2017
11 May
'17
11:47 p.m.
On Thu, 11 May 2017, Larry McVoy wrote:
[...]
Try the same thing with Linux. The file system will
come back, starting
with, I believe, ext2.
That's a journalled FS, isn't it? In which case the transactions get
replayed.
My belief is that Linux orders writes such that while
you may lose data
(as in, a process created a file, the OS said it was OK, but that file
will not be in the file system after a crash), but the rest of the file
system will be consistent. I think it's as if you powered off the
machine a few seconds earlier than you actually did, some stuff is in
flight and until they can write stuff out in the proper order you may
lose data on a hard reset.
And FreeBSD (at least) has been doing ordered writes for quite some time.
--
Dave Horsfall DTM (VK2KFU) "Those who don't understand security will
suffer."