btrfs

Documentation

Overview

Package btrfs provides access to statistics exposed by Btrfs filesystems.

Index

• Constants
• type Allocation
• type AllocationStats
• type Device
• type FS
  • func NewDefaultFS() (FS, error)
  • func NewFS(mountPoint string) (FS, error)
  • func (fs FS) Stats() ([]*Stats, error)
• type LayoutUsage
• type Stats
  • func GetStats(uuidPath string) (*Stats, error)

Constants

const SectorSize = 512

SectorSize contains the Linux sector size. > Linux always considers sectors to be 512 bytes long independently > of the devices real block size.

Types

type Allocation

type Allocation struct {
	GlobalRsvReserved, GlobalRsvSize uint64
	Data, Metadata, System           *AllocationStats
}

Allocation contains allocation statistics for data, metadata and system data.

type AllocationStats

type AllocationStats struct {
	// Usage statistics
	DiskUsedBytes    uint64
	DiskTotalBytes   uint64
	MayUseBytes      uint64
	PinnedBytes      uint64
	TotalPinnedBytes uint64
	ReadOnlyBytes    uint64
	ReservedBytes    uint64
	UsedBytes        uint64
	TotalBytes       uint64

	// Flags marking filesystem state
	// See Linux fs/btrfs/ctree.h for more information.
	Flags uint64

	// Additional disk usage statistics depending on the disk layout.
	// At least one of these will exist and not be nil.
	Layouts map[string]*LayoutUsage
}

AllocationStats contains allocation statistics for a data type.

type Device

type Device struct {
	Size uint64
}

Device contains information about a device that is part of a Btrfs filesystem.

type FS

type FS struct {
	// contains filtered or unexported fields
}

FS represents the pseudo-filesystem sys, which provides an interface to kernel data structures.

func NewDefaultFS

func NewDefaultFS() (FS, error)

NewDefaultFS returns a new Bcache using the default sys fs mount point. It will error if the mount point can't be read.

func NewFS

func NewFS(mountPoint string) (FS, error)

NewFS returns a new Btrfs filesystem using the given sys fs mount point. It will error if the mount point can't be read.

func (FS) Stats

func (fs FS) Stats() ([]*Stats, error)

Stats retrieves Btrfs filesystem runtime statistics for each mounted Btrfs filesystem.

type LayoutUsage

type LayoutUsage struct {
	UsedBytes, TotalBytes uint64
	Ratio                 float64
}

LayoutUsage contains additional usage statistics for a disk layout.

type Stats

type Stats struct {
	UUID, Label    string
	Allocation     Allocation
	Devices        map[string]*Device
	Features       []string
	CloneAlignment uint64
	NodeSize       uint64
	QuotaOverride  uint64
	SectorSize     uint64
}

Stats contains statistics for a single Btrfs filesystem. See Linux fs/btrfs/sysfs.c for more information.

func GetStats

func GetStats(uuidPath string) (*Stats, error)

GetStats collects all Btrfs statistics from sysfs