389 lines
15 KiB
Go
389 lines
15 KiB
Go
// Package zfs implements basic manipulation of ZFS pools and data sets.
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// Use libzfs C library instead CLI zfs tools, with goal
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// to let using and manipulating OpenZFS form with in go project.
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//
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// TODO: Adding to the pool. (Add the given vdevs to the pool)
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// TODO: Scan for pools.
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//
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//
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package zfs
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/*
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#cgo CFLAGS: -I /usr/include/libzfs -I /usr/include/libspl -DHAVE_IOCTL_IN_SYS_IOCTL_H
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#cgo LDFLAGS: -lzfs -lzpool -lnvpair
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#include <stdlib.h>
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#include <libzfs.h>
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#include "common.h"
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#include "zpool.h"
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#include "zfs.h"
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*/
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import "C"
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import (
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"errors"
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"sync"
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)
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// VDevType type of device in the pool
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type VDevType string
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func init() {
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C.go_libzfs_init()
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return
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}
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// Types of Virtual Devices
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const (
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VDevTypeRoot VDevType = "root" // VDevTypeRoot root device in ZFS pool
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VDevTypeMirror = "mirror" // VDevTypeMirror mirror device in ZFS pool
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VDevTypeReplacing = "replacing" // VDevTypeReplacing replacing
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VDevTypeRaidz = "raidz" // VDevTypeRaidz RAIDZ device
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VDevTypeDisk = "disk" // VDevTypeDisk device is disk
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VDevTypeFile = "file" // VDevTypeFile device is file
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VDevTypeMissing = "missing" // VDevTypeMissing missing device
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VDevTypeHole = "hole" // VDevTypeHole hole
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VDevTypeSpare = "spare" // VDevTypeSpare spare device
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VDevTypeLog = "log" // VDevTypeLog ZIL device
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VDevTypeL2cache = "l2cache" // VDevTypeL2cache cache device (disk)
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)
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// Prop type to enumerate all different properties suppoerted by ZFS
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type Prop int
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// PoolStatus type representing status of the pool
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type PoolStatus int
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// PoolState type representing pool state
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type PoolState uint64
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// VDevState - vdev states tye
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type VDevState uint64
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// VDevAux - vdev aux states
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type VDevAux uint64
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// Property ZFS pool or dataset property value
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type Property struct {
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Value string
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Source string
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}
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var Global struct {
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Mtx sync.Mutex
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}
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// Pool status
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const (
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/*
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* The following correspond to faults as defined in the (fault.fs.zfs.*)
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* event namespace. Each is associated with a corresponding message ID.
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*/
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PoolStatusCorruptCache PoolStatus = iota /* corrupt /kernel/drv/zpool.cache */
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PoolStatusMissingDevR /* missing device with replicas */
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PoolStatusMissingDevNr /* missing device with no replicas */
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PoolStatusCorruptLabelR /* bad device label with replicas */
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PoolStatusCorruptLabelNr /* bad device label with no replicas */
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PoolStatusBadGUIDSum /* sum of device guids didn't match */
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PoolStatusCorruptPool /* pool metadata is corrupted */
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PoolStatusCorruptData /* data errors in user (meta)data */
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PoolStatusFailingDev /* device experiencing errors */
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PoolStatusVersionNewer /* newer on-disk version */
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PoolStatusHostidMismatch /* last accessed by another system */
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PoolStatusIoFailureWait /* failed I/O, failmode 'wait' */
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PoolStatusIoFailureContinue /* failed I/O, failmode 'continue' */
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PoolStatusBadLog /* cannot read log chain(s) */
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PoolStatusErrata /* informational errata available */
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/*
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* If the pool has unsupported features but can still be opened in
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* read-only mode, its status is ZPOOL_STATUS_UNSUP_FEAT_WRITE. If the
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* pool has unsupported features but cannot be opened at all, its
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* status is ZPOOL_STATUS_UNSUP_FEAT_READ.
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*/
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PoolStatusUnsupFeatRead /* unsupported features for read */
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PoolStatusUnsupFeatWrite /* unsupported features for write */
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/*
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* These faults have no corresponding message ID. At the time we are
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* checking the status, the original reason for the FMA fault (I/O or
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* checksum errors) has been lost.
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*/
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PoolStatusFaultedDevR /* faulted device with replicas */
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PoolStatusFaultedDevNr /* faulted device with no replicas */
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/*
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* The following are not faults per se, but still an error possibly
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* requiring administrative attention. There is no corresponding
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* message ID.
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*/
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PoolStatusVersionOlder /* older legacy on-disk version */
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PoolStatusFeatDisabled /* supported features are disabled */
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PoolStatusResilvering /* device being resilvered */
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PoolStatusOfflineDev /* device online */
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PoolStatusRemovedDev /* removed device */
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/*
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* Finally, the following indicates a healthy pool.
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*/
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PoolStatusOk
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)
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// Possible ZFS pool states
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const (
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PoolStateActive PoolState = iota /* In active use */
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PoolStateExported /* Explicitly exported */
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PoolStateDestroyed /* Explicitly destroyed */
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PoolStateSpare /* Reserved for hot spare use */
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PoolStateL2cache /* Level 2 ARC device */
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PoolStateUninitialized /* Internal spa_t state */
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PoolStateUnavail /* Internal libzfs state */
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PoolStatePotentiallyActive /* Internal libzfs state */
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)
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// Pool properties. Enumerates available ZFS pool properties. Use it to access
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// pool properties either to read or set soecific property.
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const (
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PoolPropName Prop = iota
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PoolPropSize
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PoolPropCapacity
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PoolPropAltroot
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PoolPropHealth
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PoolPropGUID
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PoolPropVersion
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PoolPropBootfs
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PoolPropDelegation
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PoolPropAutoreplace
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PoolPropCachefile
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PoolPropFailuremode
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PoolPropListsnaps
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PoolPropAutoexpand
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PoolPropDedupditto
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PoolPropDedupratio
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PoolPropFree
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PoolPropAllocated
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PoolPropReadonly
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PoolPropAshift
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PoolPropComment
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PoolPropExpandsz
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PoolPropFreeing
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PoolPropFragmentaion
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PoolPropLeaked
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PoolPropMaxBlockSize
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PoolPropTName
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PoolNumProps
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)
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/*
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* Dataset properties are identified by these constants and must be added to
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* the end of this list to ensure that external consumers are not affected
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* by the change. If you make any changes to this list, be sure to update
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* the property table in module/zcommon/zfs_prop.c.
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*/
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const (
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DatasetPropType Prop = iota
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DatasetPropCreation
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DatasetPropUsed
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DatasetPropAvailable
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DatasetPropReferenced
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DatasetPropCompressratio
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DatasetPropMounted
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DatasetPropOrigin
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DatasetPropQuota
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DatasetPropReservation
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DatasetPropVolsize
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DatasetPropVolblocksize
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DatasetPropRecordsize
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DatasetPropMountpoint
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DatasetPropSharenfs
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DatasetPropChecksum
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DatasetPropCompression
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DatasetPropAtime
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DatasetPropDevices
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DatasetPropExec
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DatasetPropSetuid
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DatasetPropReadonly
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DatasetPropZoned
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DatasetPropSnapdir
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DatasetPropPrivate /* not exposed to user, temporary */
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DatasetPropAclinherit
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DatasetPropCreatetxg /* not exposed to the user */
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DatasetPropName /* not exposed to the user */
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DatasetPropCanmount
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DatasetPropIscsioptions /* not exposed to the user */
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DatasetPropXattr
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DatasetPropNumclones /* not exposed to the user */
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DatasetPropCopies
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DatasetPropVersion
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DatasetPropUtf8only
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DatasetPropNormalize
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DatasetPropCase
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DatasetPropVscan
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DatasetPropNbmand
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DatasetPropSharesmb
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DatasetPropRefquota
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DatasetPropRefreservation
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DatasetPropGUID
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DatasetPropPrimarycache
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DatasetPropSecondarycache
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DatasetPropUsedsnap
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DatasetPropUsedds
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DatasetPropUsedchild
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DatasetPropUsedrefreserv
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DatasetPropUseraccounting /* not exposed to the user */
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DatasetPropStmfShareinfo /* not exposed to the user */
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DatasetPropDeferDestroy
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DatasetPropUserrefs
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DatasetPropLogbias
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DatasetPropUnique /* not exposed to the user */
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DatasetPropObjsetid /* not exposed to the user */
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DatasetPropDedup
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DatasetPropMlslabel
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DatasetPropSync
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DatasetPropRefratio
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DatasetPropWritten
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DatasetPropClones
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DatasetPropLogicalused
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DatasetPropLogicalreferenced
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DatasetPropInconsistent /* not exposed to the user */
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DatasetPropSnapdev
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DatasetPropAcltype
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DatasetPropSelinuxContext
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DatasetPropSelinuxFsContext
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DatasetPropSelinuxDefContext
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DatasetPropSelinuxRootContext
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DatasetPropRelatime
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DatasetPropRedundantMetadata
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DatasetPropOverlay
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DatasetNumProps
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)
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// LastError get last underlying libzfs error description if any
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func LastError() (err error) {
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return errors.New(C.GoString(C.libzfs_last_error_str()))
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}
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// ClearLastError force clear of any last error set by undeliying libzfs
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func ClearLastError() (err error) {
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err = LastError()
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C.libzfs_clear_last_error()
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return
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}
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func booleanT(b bool) (r C.boolean_t) {
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if b {
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return 1
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}
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return 0
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}
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// ZFS errors
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const (
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ESuccess = 0 /* no error -- success */
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ENomem = 2000 << iota /* out of memory */
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EBadprop /* invalid property value */
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EPropreadonly /* cannot set readonly property */
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EProptype /* property does not apply to dataset type */
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EPropnoninherit /* property is not inheritable */
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EPropspace /* bad quota or reservation */
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EBadtype /* dataset is not of appropriate type */
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EBusy /* pool or dataset is busy */
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EExists /* pool or dataset already exists */
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ENoent /* no such pool or dataset */
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EBadstream /* bad backup stream */
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EDsreadonly /* dataset is readonly */
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EVoltoobig /* volume is too large for 32-bit system */
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EInvalidname /* invalid dataset name */
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EBadrestore /* unable to restore to destination */
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EBadbackup /* backup failed */
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EBadtarget /* bad attach/detach/replace target */
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ENodevice /* no such device in pool */
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EBaddev /* invalid device to add */
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ENoreplicas /* no valid replicas */
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EResilvering /* currently resilvering */
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EBadversion /* unsupported version */
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EPoolunavail /* pool is currently unavailable */
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EDevoverflow /* too many devices in one vdev */
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EBadpath /* must be an absolute path */
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ECrosstarget /* rename or clone across pool or dataset */
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EZoned /* used improperly in local zone */
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EMountfailed /* failed to mount dataset */
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EUmountfailed /* failed to unmount dataset */
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EUnsharenfsfailed /* unshare(1M) failed */
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ESharenfsfailed /* share(1M) failed */
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EPerm /* permission denied */
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ENospc /* out of space */
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EFault /* bad address */
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EIo /* I/O error */
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EIntr /* signal received */
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EIsspare /* device is a hot spare */
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EInvalconfig /* invalid vdev configuration */
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ERecursive /* recursive dependency */
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ENohistory /* no history object */
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EPoolprops /* couldn't retrieve pool props */
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EPoolNotsup /* ops not supported for this type of pool */
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EPoolInvalarg /* invalid argument for this pool operation */
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ENametoolong /* dataset name is too long */
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EOpenfailed /* open of device failed */
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ENocap /* couldn't get capacity */
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ELabelfailed /* write of label failed */
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EBadwho /* invalid permission who */
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EBadperm /* invalid permission */
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EBadpermset /* invalid permission set name */
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ENodelegation /* delegated administration is disabled */
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EUnsharesmbfailed /* failed to unshare over smb */
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ESharesmbfailed /* failed to share over smb */
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EBadcache /* bad cache file */
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EIsl2CACHE /* device is for the level 2 ARC */
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EVdevnotsup /* unsupported vdev type */
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ENotsup /* ops not supported on this dataset */
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EActiveSpare /* pool has active shared spare devices */
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EUnplayedLogs /* log device has unplayed logs */
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EReftagRele /* snapshot release: tag not found */
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EReftagHold /* snapshot hold: tag already exists */
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ETagtoolong /* snapshot hold/rele: tag too long */
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EPipefailed /* pipe create failed */
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EThreadcreatefailed /* thread create failed */
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EPostsplitOnline /* onlining a disk after splitting it */
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EScrubbing /* currently scrubbing */
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ENoScrub /* no active scrub */
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EDiff /* general failure of zfs diff */
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EDiffdata /* bad zfs diff data */
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EPoolreadonly /* pool is in read-only mode */
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EUnknown
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)
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// vdev states are ordered from least to most healthy.
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// A vdev that's VDevStateCantOpen or below is considered unusable.
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const (
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VDevStateUnknown VDevState = iota // Uninitialized vdev
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VDevStateClosed // Not currently open
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VDevStateOffline // Not allowed to open
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VDevStateRemoved // Explicitly removed from system
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VDevStateCantOpen // Tried to open, but failed
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VDevStateFaulted // External request to fault device
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VDevStateDegraded // Replicated vdev with unhealthy kids
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VDevStateHealthy // Presumed good
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)
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// vdev aux states. When a vdev is in the VDevStateCantOpen state, the aux field
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// of the vdev stats structure uses these constants to distinguish why.
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const (
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VDevAuxNone VDevAux = iota // no error
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VDevAuxOpenFailed // ldi_open_*() or vn_open() failed
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VDevAuxCorruptData // bad label or disk contents
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VDevAuxNoReplicas // insufficient number of replicas
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VDevAuxBadGUIDSum // vdev guid sum doesn't match
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VDevAuxTooSmall // vdev size is too small
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VDevAuxBadLabel // the label is OK but invalid
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VDevAuxVersionNewer // on-disk version is too new
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VDevAuxVersionOlder // on-disk version is too old
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VDevAuxUnsupFeat // unsupported features
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VDevAuxSpared // hot spare used in another pool
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VDevAuxErrExceeded // too many errors
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VDevAuxIOFailure // experienced I/O failure
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VDevAuxBadLog // cannot read log chain(s)
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VDevAuxExternal // external diagnosis
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VDevAuxSplitPool // vdev was split off into another pool
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)
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