// Package zfs implements basic manipulation of ZFS pools and data sets. // Use libzfs C library instead CLI zfs tools, with goal // to let using and manipulating OpenZFS form with in go project. // // TODO: Adding to the pool. (Add the given vdevs to the pool) // TODO: Scan for pools. // // package zfs /* #cgo CFLAGS: -I /usr/include/libzfs -I /usr/include/libspl -DHAVE_IOCTL_IN_SYS_IOCTL_H -D_GNU_SOURCE #cgo LDFLAGS: -lzfs -lzpool -lnvpair #include #include #include "common.h" #include "zpool.h" #include "zfs.h" */ import "C" import ( "errors" "sync" ) // VDevType type of device in the pool type VDevType string func init() { C.go_libzfs_init() return } // Types of Virtual Devices const ( VDevTypeRoot VDevType = "root" // VDevTypeRoot root device in ZFS pool VDevTypeMirror = "mirror" // VDevTypeMirror mirror device in ZFS pool VDevTypeReplacing = "replacing" // VDevTypeReplacing replacing VDevTypeRaidz = "raidz" // VDevTypeRaidz RAIDZ device VDevTypeDisk = "disk" // VDevTypeDisk device is disk VDevTypeFile = "file" // VDevTypeFile device is file VDevTypeMissing = "missing" // VDevTypeMissing missing device VDevTypeHole = "hole" // VDevTypeHole hole VDevTypeSpare = "spare" // VDevTypeSpare spare device VDevTypeLog = "log" // VDevTypeLog ZIL device VDevTypeL2cache = "l2cache" // VDevTypeL2cache cache device (disk) ) // Prop type to enumerate all different properties suppoerted by ZFS type Prop int // PoolStatus type representing status of the pool type PoolStatus int // PoolState type representing pool state type PoolState uint64 // VDevState - vdev states tye type VDevState uint64 // VDevAux - vdev aux states type VDevAux uint64 // Property ZFS pool or dataset property value type Property struct { Value string Source string } var Global struct { Mtx sync.Mutex } // Pool status const ( /* * The following correspond to faults as defined in the (fault.fs.zfs.*) * event namespace. Each is associated with a corresponding message ID. */ PoolStatusCorruptCache PoolStatus = iota /* corrupt /kernel/drv/zpool.cache */ PoolStatusMissingDevR /* missing device with replicas */ PoolStatusMissingDevNr /* missing device with no replicas */ PoolStatusCorruptLabelR /* bad device label with replicas */ PoolStatusCorruptLabelNr /* bad device label with no replicas */ PoolStatusBadGUIDSum /* sum of device guids didn't match */ PoolStatusCorruptPool /* pool metadata is corrupted */ PoolStatusCorruptData /* data errors in user (meta)data */ PoolStatusFailingDev /* device experiencing errors */ PoolStatusVersionNewer /* newer on-disk version */ PoolStatusHostidMismatch /* last accessed by another system */ PoolStatusHosidActive /* currently active on another system */ PoolStatusHostidRequired /* multihost=on and hostid=0 */ PoolStatusIoFailureWait /* failed I/O, failmode 'wait' */ PoolStatusIoFailureContinue /* failed I/O, failmode 'continue' */ PoolStatusIOFailureMap /* ailed MMP, failmode not 'panic' */ PoolStatusBadLog /* cannot read log chain(s) */ PoolStatusErrata /* informational errata available */ /* * If the pool has unsupported features but can still be opened in * read-only mode, its status is ZPOOL_STATUS_UNSUP_FEAT_WRITE. If the * pool has unsupported features but cannot be opened at all, its * status is ZPOOL_STATUS_UNSUP_FEAT_READ. */ PoolStatusUnsupFeatRead /* unsupported features for read */ PoolStatusUnsupFeatWrite /* unsupported features for write */ /* * These faults have no corresponding message ID. At the time we are * checking the status, the original reason for the FMA fault (I/O or * checksum errors) has been lost. */ PoolStatusFaultedDevR /* faulted device with replicas */ PoolStatusFaultedDevNr /* faulted device with no replicas */ /* * The following are not faults per se, but still an error possibly * requiring administrative attention. There is no corresponding * message ID. */ PoolStatusVersionOlder /* older legacy on-disk version */ PoolStatusFeatDisabled /* supported features are disabled */ PoolStatusResilvering /* device being resilvered */ PoolStatusOfflineDev /* device online */ PoolStatusRemovedDev /* removed device */ /* * Finally, the following indicates a healthy pool. */ PoolStatusOk ) // Possible ZFS pool states const ( PoolStateActive PoolState = iota /* In active use */ PoolStateExported /* Explicitly exported */ PoolStateDestroyed /* Explicitly destroyed */ PoolStateSpare /* Reserved for hot spare use */ PoolStateL2cache /* Level 2 ARC device */ PoolStateUninitialized /* Internal spa_t state */ PoolStateUnavail /* Internal libzfs state */ PoolStatePotentiallyActive /* Internal libzfs state */ ) // Pool properties. Enumerates available ZFS pool properties. Use it to access // pool properties either to read or set soecific property. const ( PoolPropCont Prop = iota - 2 PoolPropInval PoolPropName PoolPropSize PoolPropCapacity PoolPropAltroot PoolPropHealth PoolPropGUID PoolPropVersion PoolPropBootfs PoolPropDelegation PoolPropAutoreplace PoolPropCachefile PoolPropFailuremode PoolPropListsnaps PoolPropAutoexpand PoolPropDedupditto PoolPropDedupratio PoolPropFree PoolPropAllocated PoolPropReadonly PoolPropAshift PoolPropComment PoolPropExpandsz PoolPropFreeing PoolPropFragmentaion PoolPropLeaked PoolPropMaxBlockSize PoolPropTName PoolPropMaxNodeSize PoolPropMultiHost PoolNumProps ) /* * Dataset properties are identified by these constants and must be added to * the end of this list to ensure that external consumers are not affected * by the change. If you make any changes to this list, be sure to update * the property table in module/zcommon/zfs_prop.c. */ const ( DatasetPropCont Prop = iota - 2 DatasetPropBad DatasetPropType DatasetPropCreation DatasetPropUsed DatasetPropAvailable DatasetPropReferenced DatasetPropCompressratio DatasetPropMounted DatasetPropOrigin DatasetPropQuota DatasetPropReservation DatasetPropVolsize DatasetPropVolblocksize DatasetPropRecordsize DatasetPropMountpoint DatasetPropSharenfs DatasetPropChecksum DatasetPropCompression DatasetPropAtime DatasetPropDevices DatasetPropExec DatasetPropSetuid DatasetPropReadonly DatasetPropZoned DatasetPropSnapdir DatasetPropPrivate /* not exposed to user, temporary */ DatasetPropAclinherit DatasetPropCreateTXG /* not exposed to the user */ DatasetPropName /* not exposed to the user */ DatasetPropCanmount DatasetPropIscsioptions /* not exposed to the user */ DatasetPropXattr DatasetPropNumclones /* not exposed to the user */ DatasetPropCopies DatasetPropVersion DatasetPropUtf8only DatasetPropNormalize DatasetPropCase DatasetPropVscan DatasetPropNbmand DatasetPropSharesmb DatasetPropRefquota DatasetPropRefreservation DatasetPropGUID DatasetPropPrimarycache DatasetPropSecondarycache DatasetPropUsedsnap DatasetPropUsedds DatasetPropUsedchild DatasetPropUsedrefreserv DatasetPropUseraccounting /* not exposed to the user */ DatasetPropStmfShareinfo /* not exposed to the user */ DatasetPropDeferDestroy DatasetPropUserrefs DatasetPropLogbias DatasetPropUnique /* not exposed to the user */ DatasetPropObjsetid /* not exposed to the user */ DatasetPropDedup DatasetPropMlslabel DatasetPropSync DatasetPropDnodeSize DatasetPropRefratio DatasetPropWritten DatasetPropClones DatasetPropLogicalused DatasetPropLogicalreferenced DatasetPropInconsistent /* not exposed to the user */ DatasetPropVolmode DatasetPropFilesystemLimit DatasetPropSnapshotLimit DatasetPropFilesystemCount DatasetPropSnapshotCount DatasetPropSnapdev DatasetPropAcltype DatasetPropSelinuxContext DatasetPropSelinuxFsContext DatasetPropSelinuxDefContext DatasetPropSelinuxRootContext DatasetPropRelatime DatasetPropRedundantMetadata DatasetPropOverlay DatasetPropPrevSnap DatasetPropReceiveResumeToken DatasetPropEncryption DatasetPropKeyLocation DatasetPropKeyFormat DatasetPropPBKDF2Salt DatasetPropPBKDF2Iters DatasetPropEncryptionRoot DatasetPropKeyGUID DatasetPropKeyStatus DatasetPropRemapTXG /* not exposed to the user */ DatasetNumProps ) // LastError get last underlying libzfs error description if any func LastError() (err error) { return errors.New(C.GoString(C.libzfs_last_error_str())) } // ClearLastError force clear of any last error set by undeliying libzfs func ClearLastError() (err error) { err = LastError() C.libzfs_clear_last_error() return } func booleanT(b bool) (r C.boolean_t) { if b { return 1 } return 0 } // ZFS errors const ( ESuccess = 0 /* no error -- success */ ENomem = 2000 << iota /* out of memory */ EBadprop /* invalid property value */ EPropreadonly /* cannot set readonly property */ EProptype /* property does not apply to dataset type */ EPropnoninherit /* property is not inheritable */ EPropspace /* bad quota or reservation */ EBadtype /* dataset is not of appropriate type */ EBusy /* pool or dataset is busy */ EExists /* pool or dataset already exists */ ENoent /* no such pool or dataset */ EBadstream /* bad backup stream */ EDsreadonly /* dataset is readonly */ EVoltoobig /* volume is too large for 32-bit system */ EInvalidname /* invalid dataset name */ EBadrestore /* unable to restore to destination */ EBadbackup /* backup failed */ EBadtarget /* bad attach/detach/replace target */ ENodevice /* no such device in pool */ EBaddev /* invalid device to add */ ENoreplicas /* no valid replicas */ EResilvering /* currently resilvering */ EBadversion /* unsupported version */ EPoolunavail /* pool is currently unavailable */ EDevoverflow /* too many devices in one vdev */ EBadpath /* must be an absolute path */ ECrosstarget /* rename or clone across pool or dataset */ EZoned /* used improperly in local zone */ EMountfailed /* failed to mount dataset */ EUmountfailed /* failed to unmount dataset */ EUnsharenfsfailed /* unshare(1M) failed */ ESharenfsfailed /* share(1M) failed */ EPerm /* permission denied */ ENospc /* out of space */ EFault /* bad address */ EIo /* I/O error */ EIntr /* signal received */ EIsspare /* device is a hot spare */ EInvalconfig /* invalid vdev configuration */ ERecursive /* recursive dependency */ ENohistory /* no history object */ EPoolprops /* couldn't retrieve pool props */ EPoolNotsup /* ops not supported for this type of pool */ EPoolInvalarg /* invalid argument for this pool operation */ ENametoolong /* dataset name is too long */ EOpenfailed /* open of device failed */ ENocap /* couldn't get capacity */ ELabelfailed /* write of label failed */ EBadwho /* invalid permission who */ EBadperm /* invalid permission */ EBadpermset /* invalid permission set name */ ENodelegation /* delegated administration is disabled */ EUnsharesmbfailed /* failed to unshare over smb */ ESharesmbfailed /* failed to share over smb */ EBadcache /* bad cache file */ EIsl2CACHE /* device is for the level 2 ARC */ EVdevnotsup /* unsupported vdev type */ ENotsup /* ops not supported on this dataset */ EActiveSpare /* pool has active shared spare devices */ EUnplayedLogs /* log device has unplayed logs */ EReftagRele /* snapshot release: tag not found */ EReftagHold /* snapshot hold: tag already exists */ ETagtoolong /* snapshot hold/rele: tag too long */ EPipefailed /* pipe create failed */ EThreadcreatefailed /* thread create failed */ EPostsplitOnline /* onlining a disk after splitting it */ EScrubbing /* currently scrubbing */ ENoScrub /* no active scrub */ EDiff /* general failure of zfs diff */ EDiffdata /* bad zfs diff data */ EPoolreadonly /* pool is in read-only mode */ EUnknown ) // vdev states are ordered from least to most healthy. // A vdev that's VDevStateCantOpen or below is considered unusable. const ( VDevStateUnknown VDevState = iota // Uninitialized vdev VDevStateClosed // Not currently open VDevStateOffline // Not allowed to open VDevStateRemoved // Explicitly removed from system VDevStateCantOpen // Tried to open, but failed VDevStateFaulted // External request to fault device VDevStateDegraded // Replicated vdev with unhealthy kids VDevStateHealthy // Presumed good ) // vdev aux states. When a vdev is in the VDevStateCantOpen state, the aux field // of the vdev stats structure uses these constants to distinguish why. const ( VDevAuxNone VDevAux = iota // no error VDevAuxOpenFailed // ldi_open_*() or vn_open() failed VDevAuxCorruptData // bad label or disk contents VDevAuxNoReplicas // insufficient number of replicas VDevAuxBadGUIDSum // vdev guid sum doesn't match VDevAuxTooSmall // vdev size is too small VDevAuxBadLabel // the label is OK but invalid VDevAuxVersionNewer // on-disk version is too new VDevAuxVersionOlder // on-disk version is too old VDevAuxUnsupFeat // unsupported features VDevAuxSpared // hot spare used in another pool VDevAuxErrExceeded // too many errors VDevAuxIOFailure // experienced I/O failure VDevAuxBadLog // cannot read log chain(s) VDevAuxExternal // external diagnosis VDevAuxSplitPool // vdev was split off into another pool )