Dāvis davispuh

Manually fixing bit flips in BTRFS

Somehow my BTRFS file system became corrupted by what appears to be a single bit flip in a metadata field. Rather than copying all the data and reformatting the file system, which would have required another disk at least as large as the original, I decided to try to fix this manually, which appears to have worked. I've documented the procedure I've used here, in case I need it again or someone else runs into a similar issue and finds it useful.

The first thing you should do is run btrfs check. For me this produced the following output:

Opening filesystem to check...
Checking filesystem on /dev/nvme0n1p1
UUID: ec7afe1c-8478-450a-82fc-d17b32d8ca3d

Each of these commands will run an ad hoc http static server in your current (or specified) directory, available at http://localhost:8000. Use this power wisely.

Discussion on reddit.

Python 2.x

$ python -m SimpleHTTPServer 8000

Do your part to resist Government surveillance and take back your privacy:

Browser Privacy: HTTPS Everywhere, AdBlock Plus + EasyList, Disconnect, NoScript (FireFox), NotScript (Chrome)
VPNs: Private Internet Access (US), BTGuard (Canada), ItsHidden (Africa), Ipredator (Sweden), Faceless.me (Cyprus / Netherlands)
Internet Anonymization: Tor, Tor Browser Bundle, I2P
Disk Encryption: TrueCrypt (Windows / OSX / Linux), File Vault

Prepare for Ruby 2.0, today

Ruby 2.0 is around the corner, estimated to be launch February 2013, for its 20th anniversary!

Wouldn't be great to be able to test Ruby 2.0 features and report possible bugs?

Things like Refinements, built-in ANSI coloring for Windows or even better, faster startup

Users of other OS like Linux and OSX already can install upcoming versions of RUby thanks to RVM and rbenv tools, but what about Windows?

	SELECT count(messageid) as count, buffername as channel
	FROM backlog
	LEFT JOIN buffer ON buffer.bufferid = backlog.bufferid
	WHERE buffername != ''
	GROUP BY buffername ORDER BY count DESC
	LIMIT 30;

	-480p - Run tenfoot in 480p rather than 1080p
	-720p - Run tenfoot in 720p rather than 1080p
	-accesscode -
	-all_languages - show longest loc string from any language
	-batterytestmode - rapidly cycle battery percentages for testing
	-bigpicture - Start in Steam Big Picture mode
	-blefw -
	-cafeapplaunch - Launch apps in a cyber cafe context
	-candidates - Show libjingle candidates for local connection as they are processed
	-ccsyntax - Spew details about the localized strings we load

	#!/usr/bin/env ruby
	require 'pp'

	a = []
	a << [:a, :c, :e]
	a << [:b, :f, :g, :h, :i, :j]
	a << [:d]


	# element coefficients

	<?php
	/**
	* DomTree
	*
	* Dump DomDocument based documents, suiting debugging needs
	*
	* @author hakre <http://hakre.wordpress.com/>
	* @link http://stackoverflow.com/questions/26321597/getting-price-from-amazon-with-xpath/26323824#26323824
	* @link http://stackoverflow.com/questions/12108324/how-to-get-a-raw-from-a-domnodelist/12108732#12108732
	* @link http://stackoverflow.com/questions/684227/debug-a-domdocument-object-in-php/8631974#8631974