Incorrect btrfs ready invocation 64-btrfs.rules

[Roger Binns]

/lib/udev/rules.d/64-btrfs.rules

This invokes "btrfs ready $devnode". However that will always give a usage error. The correct invocation is as follows (note added "device").

btrfs device ready $devnode

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: udev 219-7ubuntu5
ProcVersionSignature: Ubuntu 3.19.0-18.18-generic 3.19.6
Uname: Linux 3.19.0-18-generic x86_64
ApportVersion: 2.17.2-0ubuntu1.1
Architecture: amd64
CurrentDesktop: XFCE
CustomUdevRuleFiles: 51-android.rules 60_smfpautoconf_samsung.rules 61_smfpautoconf_samsung.rules 99-libsane-samsungmfp.rules 60-vboxdrv.rules
Date: Thu Jun 4 10:39:36 2015
MachineType: System manufacturer System Product Name
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-18-generic root=UUID=3ff68715-0daa-4e44-8de2-0997f36d8ab6 ro rootflags=subvol=@ nomdmonddf nomdmonisw init=/lib/systemd/systemd udev.log-priority=debug rd.udev.log-priority=debug
SourcePackage: systemd
UpgradeStatus: Upgraded to vivid on 2015-04-23 (41 days ago)
dmi.bios.date: 08/13/2013
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 2104
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: P8Z77-V PRO
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr2104:bd08/13/2013:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnP8Z77-VPRO:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer

[Roger Binns (ubuntu-rogerbinns)]

Supposedly 'btrfs ready $devnode' is internal to udev and unrelated to the similarly named btrfs device ready command