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inode.go
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inode.go
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// Copyright (c) 2015-2021, NVIDIA CORPORATION.
// SPDX-License-Identifier: Apache-2.0
package inode
import (
"container/list"
"encoding/json"
"fmt"
"runtime/debug"
"strings"
"sync"
"time"
"github.com/ansel1/merry"
"github.com/swiftstack/cstruct"
"github.com/swiftstack/sortedmap"
"github.com/swiftstack/ProxyFS/blunder"
"github.com/swiftstack/ProxyFS/dlm"
"github.com/swiftstack/ProxyFS/evtlog"
"github.com/swiftstack/ProxyFS/halter"
"github.com/swiftstack/ProxyFS/headhunter"
"github.com/swiftstack/ProxyFS/logger"
"github.com/swiftstack/ProxyFS/stats"
"github.com/swiftstack/ProxyFS/swiftclient"
"github.com/swiftstack/ProxyFS/trackedlock"
"github.com/swiftstack/ProxyFS/utils"
)
// Shorthand for inode internal API debug log id; global to the package
var int_inode_debug = logger.DbgInodeInternal
const (
optimisticInodeFetchBytes = 2048
)
type CorruptionDetected bool
type Version uint64
const (
V1 Version = iota + 1 // use type/struct onDiskInodeV1Struct
onDiskInodeV1PayloadObjectOffset uint64 = 0
)
type onDiskInodeV1Struct struct { // Preceded "on disk" by CorruptionDetected then Version both in cstruct.LittleEndian form
InodeNumber
InodeType
LinkCount uint64
Size uint64
CreationTime time.Time
ModificationTime time.Time
AccessTime time.Time
AttrChangeTime time.Time
NumWrites uint64
Mode InodeMode
UserID InodeUserID
GroupID InodeGroupID
StreamMap map[string][]byte
PayloadObjectNumber uint64 // DirInode: B+Tree Root with Key == dir_entry_name, Value = InodeNumber
PayloadObjectLength uint64 // FileInode: B+Tree Root with Key == fileOffset, Value = fileExtent
SymlinkTarget string // SymlinkInode: target path of symbolic link
LogSegmentMap map[uint64]uint64 // FileInode: Key == LogSegment#, Value = file user data byte count
}
type inFlightLogSegmentStruct struct { // Used as (by reference) Value for inMemoryInodeStruct.inFlightLogSegmentMap
logSegmentNumber uint64 // Used as (by value) Key for inMemoryInodeStruct.inFlightLogSegmentMap
openLogSegmentLRUNext *inFlightLogSegmentStruct
openLogSegmentLRUPrev *inFlightLogSegmentStruct
fileInode *inMemoryInodeStruct
accountName string
containerName string
objectName string
openLogSegmentListElement list.Element
swiftclient.ChunkedPutContext
}
type inMemoryInodeStruct struct {
trackedlock.Mutex // Used to synchronize with background fileInodeFlusherDaemon
sync.WaitGroup // FileInode Flush requests wait on this
inodeCacheLRUNext *inMemoryInodeStruct
inodeCacheLRUPrev *inMemoryInodeStruct
dirty bool
volume *volumeStruct
snapShotID uint64
payload interface{} // DirInode: B+Tree with Key == dir_entry_name, Value = InodeNumber
// FileInode: B+Tree with Key == fileOffset, Value = *fileExtent
openLogSegment *inFlightLogSegmentStruct // FileInode only... also in inFlightLogSegmentMap
inFlightLogSegmentMap map[uint64]*inFlightLogSegmentStruct // FileInode: key == logSegmentNumber
inFlightLogSegmentErrors map[uint64]error // FileInode: key == logSegmentNumber; value == err (if non nil)
onDiskInodeV1Struct // Real on-disk inode information embedded here
}
func (vS *volumeStruct) DumpKey(key sortedmap.Key) (keyAsString string, err error) {
keyAsInodeNumber, ok := key.(InodeNumber)
if !ok {
err = fmt.Errorf("inode.volumeStruct.DumpKey() could not parse key as a InodeNumber")
return
}
keyAsString = fmt.Sprintf("0x%016X", keyAsInodeNumber)
err = nil
return
}
func (vS *volumeStruct) DumpValue(value sortedmap.Value) (valueAsString string, err error) {
valueAsInMemoryInodeStructPtr, ok := value.(*inMemoryInodeStruct)
if !ok {
err = fmt.Errorf("inode.volumeStruct.DumpValue() could not parse value as a *inMemoryInodeStruct")
return
}
valueAsString = fmt.Sprintf("%016p", valueAsInMemoryInodeStructPtr)
err = nil
return
}
func compareInodeNumber(key1 sortedmap.Key, key2 sortedmap.Key) (result int, err error) {
key1InodeNumber, ok := key1.(InodeNumber)
if !ok {
err = fmt.Errorf("compareInodeNumber(non-InodeNumber,) not supported")
return
}
key2InodeNumber, ok := key2.(InodeNumber)
if !ok {
err = fmt.Errorf("compareInodeNumber(InodeNumber, non-InodeNumber) not supported")
return
}
if key1InodeNumber < key2InodeNumber {
result = -1
} else if key1InodeNumber == key2InodeNumber {
result = 0
} else { // key1InodeNumber > key2InodeNumber
result = 1
}
err = nil
return
}
func setRWMode(rwMode RWModeType) (err error) {
if rwMode != globals.rwMode {
switch rwMode {
case RWModeNormal:
stats.IncrementOperations(&stats.ReconCheckTriggeredNormalMode)
case RWModeNoWrite:
stats.IncrementOperations(&stats.ReconCheckTriggeredNoWriteMode)
case RWModeReadOnly:
stats.IncrementOperations(&stats.ReconCheckTriggeredReadOnlyMode)
default:
err = fmt.Errorf("SetRWMode(rwMode==%d) not allowed... must be one of RWModeNormal(%d), RWModeNoWrite(%d), or RWModeReadOnly(%d)", rwMode, RWModeNormal, RWModeNoWrite, RWModeReadOnly)
return
}
globals.rwMode = rwMode
}
err = nil
return
}
func enforceRWMode(enforceNoWriteMode bool) (err error) {
var (
rwModeCopy RWModeType
)
rwModeCopy = globals.rwMode
if rwModeCopy == RWModeReadOnly {
err = blunder.NewError(globals.readOnlyThresholdErrno, globals.readOnlyThresholdErrnoString)
} else if enforceNoWriteMode && (rwModeCopy == RWModeNoWrite) {
err = blunder.NewError(globals.noWriteThresholdErrno, globals.noWriteThresholdErrnoString)
} else {
err = nil
}
return
}
func (vS *volumeStruct) FetchOnDiskInode(inodeNumber InodeNumber) (corruptionDetected CorruptionDetected, version Version, onDiskInode []byte, err error) {
var (
bytesConsumedByCorruptionDetected uint64
bytesConsumedByVersion uint64
inodeRec []byte
ok bool
)
corruptionDetected = CorruptionDetected(false)
version = Version(0)
onDiskInode = make([]byte, 0)
inodeRec, ok, err = vS.headhunterVolumeHandle.GetInodeRec(uint64(inodeNumber))
if nil != err {
err = fmt.Errorf("headhunter.GetInodeRec() failed: %v", err)
return
}
if !ok {
err = fmt.Errorf("headhunter.GetInodeRec() returned !ok")
return
}
bytesConsumedByCorruptionDetected, err = cstruct.Unpack(inodeRec, &corruptionDetected, cstruct.LittleEndian)
if nil != err {
err = fmt.Errorf("cstruct.Unpack(,&corruptionDetected,) failed: %v", err)
return
}
if corruptionDetected {
return
}
bytesConsumedByVersion, err = cstruct.Unpack(inodeRec[bytesConsumedByCorruptionDetected:], &version, cstruct.LittleEndian)
if nil != err {
err = fmt.Errorf("cstruct.Unpack(,&version,) failed: %v", err)
return
}
onDiskInode = inodeRec[bytesConsumedByCorruptionDetected+bytesConsumedByVersion:]
return
}
func (vS *volumeStruct) fetchOnDiskInode(inodeNumber InodeNumber) (inMemoryInode *inMemoryInodeStruct, ok bool, err error) {
var (
bytesConsumedByCorruptionDetected uint64
bytesConsumedByVersion uint64
corruptionDetected CorruptionDetected
inodeRec []byte
onDiskInodeV1 *onDiskInodeV1Struct
snapShotID uint64
snapShotIDType headhunter.SnapShotIDType
version Version
)
snapShotIDType, snapShotID, _ = vS.headhunterVolumeHandle.SnapShotU64Decode(uint64(inodeNumber))
if headhunter.SnapShotIDTypeDotSnapShot == snapShotIDType {
logger.Fatalf("fetchOnDiskInode for headhunter.SnapShotIDTypeDotSnapShot not allowed")
}
inodeRec, ok, err = vS.headhunterVolumeHandle.GetInodeRec(uint64(inodeNumber))
if nil != err {
stackStr := string(debug.Stack())
err = fmt.Errorf("%s: unable to get inodeRec for inode %d: %v stack: %s",
utils.GetFnName(), inodeNumber, err, stackStr)
err = blunder.AddError(err, blunder.NotFoundError)
return
}
if !ok {
return
}
bytesConsumedByCorruptionDetected, err = cstruct.Unpack(inodeRec, &corruptionDetected, cstruct.LittleEndian)
if nil != err {
err = fmt.Errorf("%s: unable to parse inodeRec.CorruptionDetected for inode %d: %v", utils.GetFnName(), inodeNumber, err)
err = blunder.AddError(err, blunder.CorruptInodeError)
return
}
if corruptionDetected {
err = fmt.Errorf("%s: inode %d has been marked corrupted", utils.GetFnName(), inodeNumber)
err = blunder.AddError(err, blunder.CorruptInodeError)
return
}
bytesConsumedByVersion, err = cstruct.Unpack(inodeRec[bytesConsumedByCorruptionDetected:], &version, cstruct.LittleEndian)
if nil != err {
err = fmt.Errorf("%s: unable to get inodeRec.Version for inode %d: %v", utils.GetFnName(), inodeNumber, err)
err = blunder.AddError(err, blunder.CorruptInodeError)
return
}
if V1 != version {
err = fmt.Errorf("%s: inodeRec.Version for inode %d (%v) not supported", utils.GetFnName(), inodeNumber, version)
err = blunder.AddError(err, blunder.CorruptInodeError)
return
}
onDiskInodeV1 = &onDiskInodeV1Struct{StreamMap: make(map[string][]byte)}
err = json.Unmarshal(inodeRec[bytesConsumedByCorruptionDetected+bytesConsumedByVersion:], onDiskInodeV1)
if nil != err {
err = fmt.Errorf("%s: inodeRec.<body> for inode %d json.Unmarshal() failed: %v", utils.GetFnName(), inodeNumber, err)
err = blunder.AddError(err, blunder.CorruptInodeError)
return
}
inMemoryInode = &inMemoryInodeStruct{
inodeCacheLRUNext: nil,
inodeCacheLRUPrev: nil,
dirty: false,
volume: vS,
snapShotID: snapShotID,
openLogSegment: nil,
inFlightLogSegmentMap: make(map[uint64]*inFlightLogSegmentStruct),
inFlightLogSegmentErrors: make(map[uint64]error),
onDiskInodeV1Struct: *onDiskInodeV1,
}
inMemoryInode.onDiskInodeV1Struct.InodeNumber = inodeNumber
switch inMemoryInode.InodeType {
case DirType:
if 0 == inMemoryInode.PayloadObjectNumber {
inMemoryInode.payload =
sortedmap.NewBPlusTree(
vS.maxEntriesPerDirNode,
sortedmap.CompareString,
&dirInodeCallbacks{treeNodeLoadable{inode: inMemoryInode}},
globals.dirEntryCache)
} else {
inMemoryInode.payload, err =
sortedmap.OldBPlusTree(
inMemoryInode.PayloadObjectNumber,
onDiskInodeV1PayloadObjectOffset,
inMemoryInode.PayloadObjectLength,
sortedmap.CompareString,
&dirInodeCallbacks{treeNodeLoadable{inode: inMemoryInode}},
globals.dirEntryCache)
if nil != err {
err = fmt.Errorf("%s: sortedmap.OldBPlusTree(inodeRec.<body>.PayloadObjectNumber) for DirType inode %d failed: %v", utils.GetFnName(), inodeNumber, err)
err = blunder.AddError(err, blunder.CorruptInodeError)
return
}
}
case FileType:
if 0 == inMemoryInode.PayloadObjectNumber {
inMemoryInode.payload =
sortedmap.NewBPlusTree(
vS.maxExtentsPerFileNode,
sortedmap.CompareUint64,
&fileInodeCallbacks{treeNodeLoadable{inode: inMemoryInode}},
globals.fileExtentMapCache)
} else {
inMemoryInode.payload, err =
sortedmap.OldBPlusTree(
inMemoryInode.PayloadObjectNumber,
onDiskInodeV1PayloadObjectOffset,
inMemoryInode.PayloadObjectLength,
sortedmap.CompareUint64,
&fileInodeCallbacks{treeNodeLoadable{inode: inMemoryInode}},
globals.fileExtentMapCache)
if nil != err {
err = fmt.Errorf("%s: sortedmap.OldBPlusTree(inodeRec.<body>.PayloadObjectNumber) for FileType inode %d failed: %v", utils.GetFnName(), inodeNumber, err)
err = blunder.AddError(err, blunder.CorruptInodeError)
return
}
}
case SymlinkType:
// Nothing special here
default:
err = fmt.Errorf("%s: inodeRec.InodeType for inode %d (%v) not supported", utils.GetFnName(), inodeNumber, inMemoryInode.InodeType)
err = blunder.AddError(err, blunder.CorruptInodeError)
return
}
err = nil
return
}
func (vS *volumeStruct) inodeCacheFetchWhileLocked(inodeNumber InodeNumber) (inode *inMemoryInodeStruct, ok bool, err error) {
var (
inodeAsValue sortedmap.Value
)
inodeAsValue, ok, err = vS.inodeCache.GetByKey(inodeNumber)
if nil != err {
return
}
if ok {
inode, ok = inodeAsValue.(*inMemoryInodeStruct)
if ok {
vS.inodeCacheTouchWhileLocked(inode)
err = nil
} else {
ok = false
err = fmt.Errorf("inodeCache[inodeNumber==0x%016X] contains a value not mappable to a *inMemoryInodeStruct", inodeNumber)
}
}
return
}
func (vS *volumeStruct) inodeCacheFetch(inodeNumber InodeNumber) (inode *inMemoryInodeStruct, ok bool, err error) {
vS.Lock()
inode, ok, err = vS.inodeCacheFetchWhileLocked(inodeNumber)
vS.Unlock()
return
}
func (vS *volumeStruct) inodeCacheInsertWhileLocked(inode *inMemoryInodeStruct) (ok bool, err error) {
ok, err = vS.inodeCache.Put(inode.InodeNumber, inode)
if (nil != err) || !ok {
return
}
// Place inode at the MRU end of inodeCacheLRU
if 0 == vS.inodeCacheLRUItems {
vS.inodeCacheLRUHead = inode
vS.inodeCacheLRUTail = inode
vS.inodeCacheLRUItems = 1
} else {
inode.inodeCacheLRUPrev = vS.inodeCacheLRUTail
inode.inodeCacheLRUPrev.inodeCacheLRUNext = inode
vS.inodeCacheLRUTail = inode
vS.inodeCacheLRUItems++
}
return
}
func (vS *volumeStruct) inodeCacheInsert(inode *inMemoryInodeStruct) (ok bool, err error) {
vS.Lock()
ok, err = vS.inodeCacheInsertWhileLocked(inode)
vS.Unlock()
return
}
func (vS *volumeStruct) inodeCacheTouchWhileLocked(inode *inMemoryInodeStruct) {
// Move inode to the MRU end of inodeCacheLRU
if inode != vS.inodeCacheLRUTail {
if inode == vS.inodeCacheLRUHead {
vS.inodeCacheLRUHead = inode.inodeCacheLRUNext
vS.inodeCacheLRUHead.inodeCacheLRUPrev = nil
inode.inodeCacheLRUPrev = vS.inodeCacheLRUTail
inode.inodeCacheLRUNext = nil
vS.inodeCacheLRUTail.inodeCacheLRUNext = inode
vS.inodeCacheLRUTail = inode
} else {
inode.inodeCacheLRUPrev.inodeCacheLRUNext = inode.inodeCacheLRUNext
inode.inodeCacheLRUNext.inodeCacheLRUPrev = inode.inodeCacheLRUPrev
inode.inodeCacheLRUNext = nil
inode.inodeCacheLRUPrev = vS.inodeCacheLRUTail
vS.inodeCacheLRUTail.inodeCacheLRUNext = inode
vS.inodeCacheLRUTail = inode
}
}
}
func (vS *volumeStruct) inodeCacheTouch(inode *inMemoryInodeStruct) {
vS.Lock()
vS.inodeCacheTouchWhileLocked(inode)
vS.Unlock()
}
// The inode cache discard thread calls this routine when the ticker goes off.
func (vS *volumeStruct) inodeCacheDiscard() (discarded uint64, dirty uint64, locked uint64, lruItems uint64) {
inodesToDrop := uint64(0)
vS.Lock()
if (vS.inodeCacheLRUItems * globals.inodeSize) > vS.inodeCacheLRUMaxBytes {
// Check, at most, 1.25 * (minimum_number_to_drop)
inodesToDrop = (vS.inodeCacheLRUItems * globals.inodeSize) - vS.inodeCacheLRUMaxBytes
inodesToDrop = inodesToDrop / globals.inodeSize
inodesToDrop += inodesToDrop / 4
for (inodesToDrop > 0) && ((vS.inodeCacheLRUItems * globals.inodeSize) > vS.inodeCacheLRUMaxBytes) {
inodesToDrop--
ic := vS.inodeCacheLRUHead
// Create a DLM lock object
id := dlm.GenerateCallerID()
inodeRWLock, _ := vS.InitInodeLock(ic.InodeNumber, id)
err := inodeRWLock.TryWriteLock()
// Inode is locked; skip it
if err != nil {
// Move inode to tail of LRU
vS.inodeCacheTouchWhileLocked(ic)
locked++
continue
}
if ic.dirty {
// The inode is busy - drop the DLM lock and move to tail
inodeRWLock.Unlock()
dirty++
vS.inodeCacheTouchWhileLocked(ic)
continue
}
var ok bool
discarded++
ok, err = vS.inodeCacheDropWhileLocked(ic)
if err != nil || !ok {
pStr := fmt.Errorf("The inodes was not found in the inode cache - ok: %v err: %v", ok, err)
panic(pStr)
}
inodeRWLock.Unlock()
// NOTE: vS.inodeCacheDropWhileLocked() removed the inode from the LRU list so
// the head is now different
}
}
lruItems = vS.inodeCacheLRUItems
vS.Unlock()
//logger.Infof("discard: %v dirty: %v locked: %v LRUitems: %v", discarded, dirty, locked, lruItems)
return
}
func (vS *volumeStruct) inodeCacheDropWhileLocked(inode *inMemoryInodeStruct) (ok bool, err error) {
ok, err = vS.inodeCache.DeleteByKey(inode.InodeNumber)
if (nil != err) || !ok {
return
}
if inode == vS.inodeCacheLRUHead {
if inode == vS.inodeCacheLRUTail {
vS.inodeCacheLRUHead = nil
vS.inodeCacheLRUTail = nil
vS.inodeCacheLRUItems = 0
} else {
vS.inodeCacheLRUHead = inode.inodeCacheLRUNext
vS.inodeCacheLRUHead.inodeCacheLRUPrev = nil
vS.inodeCacheLRUItems--
inode.inodeCacheLRUNext = nil
}
} else {
if inode == vS.inodeCacheLRUTail {
vS.inodeCacheLRUTail = inode.inodeCacheLRUPrev
vS.inodeCacheLRUTail.inodeCacheLRUNext = nil
vS.inodeCacheLRUItems--
inode.inodeCacheLRUPrev = nil
} else {
inode.inodeCacheLRUPrev.inodeCacheLRUNext = inode.inodeCacheLRUNext
inode.inodeCacheLRUNext.inodeCacheLRUPrev = inode.inodeCacheLRUPrev
vS.inodeCacheLRUItems--
inode.inodeCacheLRUNext = nil
inode.inodeCacheLRUPrev = nil
}
}
return
}
func (vS *volumeStruct) inodeCacheDrop(inode *inMemoryInodeStruct) (ok bool, err error) {
vS.Lock()
ok, err = vS.inodeCacheDropWhileLocked(inode)
vS.Unlock()
return
}
func (vS *volumeStruct) fetchInode(inodeNumber InodeNumber) (inode *inMemoryInodeStruct, ok bool, err error) {
for {
inode, ok, err = vS.inodeCacheFetch(inodeNumber)
if nil != err {
return
}
if ok {
return
}
inode, ok, err = vS.fetchOnDiskInode(inodeNumber)
if nil != err {
return
}
if !ok {
err = fmt.Errorf("%s.fetchInode(0x%016X) not found", vS.volumeName, inodeNumber)
return
}
ok, err = vS.inodeCacheInsert(inode)
if nil != err {
return
}
if ok {
return
}
// If we reach here, somebody beat us to it... just restart the fetch...
}
}
// Fetch inode with inode type checking
func (vS *volumeStruct) fetchInodeType(inodeNumber InodeNumber, expectedType InodeType) (inode *inMemoryInodeStruct, err error) {
inode, ok, err := vS.fetchInode(inodeNumber)
if nil != err {
return
}
if !ok {
err = fmt.Errorf("%s: expected inode %d volume '%s' to be type %v, but it was unallocated",
utils.GetFnName(), inode.InodeNumber, vS.volumeName, expectedType)
err = blunder.AddError(err, blunder.NotFoundError)
return
}
if inode.InodeType == expectedType {
// success
return
}
err = fmt.Errorf("%s: expected inode %d volume '%s' to be type %v, got %v",
utils.GetFnName(), inode.InodeNumber, vS.volumeName, expectedType, inode.InodeType)
var errVal blunder.FsError
switch expectedType {
case DirType:
errVal = blunder.NotDirError
case FileType:
errVal = blunder.NotFileError
case SymlinkType:
errVal = blunder.NotSymlinkError
default:
panic(fmt.Sprintf("unknown inode type=%v!", expectedType))
}
err = blunder.AddError(err, errVal)
return
}
func (vS *volumeStruct) makeInMemoryInodeWithThisInodeNumber(inodeType InodeType, fileMode InodeMode, userID InodeUserID, groupID InodeGroupID, inodeNumber InodeNumber, volumeLocked bool) (inMemoryInode *inMemoryInodeStruct) {
var (
birthTime time.Time
nonce uint64
snapShotID uint64
snapShotIDType headhunter.SnapShotIDType
)
snapShotIDType, snapShotID, nonce = vS.headhunterVolumeHandle.SnapShotU64Decode(uint64(inodeNumber))
if headhunter.SnapShotIDTypeDotSnapShot == snapShotIDType {
logger.Fatalf("makeInMemoryInodeWithThisInodeNumber for headhunter.SnapShotIDTypeDotSnapShot not allowed")
}
birthTime = time.Now()
inMemoryInode = &inMemoryInodeStruct{
inodeCacheLRUNext: nil,
inodeCacheLRUPrev: nil,
dirty: true,
volume: vS,
snapShotID: snapShotID,
openLogSegment: nil,
inFlightLogSegmentMap: make(map[uint64]*inFlightLogSegmentStruct),
inFlightLogSegmentErrors: make(map[uint64]error),
onDiskInodeV1Struct: onDiskInodeV1Struct{
InodeNumber: InodeNumber(nonce),
InodeType: inodeType,
CreationTime: birthTime,
ModificationTime: birthTime,
AccessTime: birthTime,
AttrChangeTime: birthTime,
NumWrites: 0,
Mode: fileMode,
UserID: userID,
GroupID: groupID,
StreamMap: make(map[string][]byte),
LogSegmentMap: make(map[uint64]uint64),
},
}
return
}
func (vS *volumeStruct) makeInMemoryInode(inodeType InodeType, fileMode InodeMode, userID InodeUserID, groupID InodeGroupID) (inMemoryInode *inMemoryInodeStruct, err error) {
inodeNumberAsUint64 := vS.headhunterVolumeHandle.FetchNonce()
inMemoryInode = vS.makeInMemoryInodeWithThisInodeNumber(inodeType, fileMode, userID, groupID, InodeNumber(inodeNumberAsUint64), false)
return
}
func (vS *volumeStruct) PatchInode(inodeNumber InodeNumber, inodeType InodeType, linkCount uint64, mode InodeMode, userID InodeUserID, groupID InodeGroupID, parentInodeNumber InodeNumber, symlinkTarget string) (err error) {
var (
callerID dlm.CallerID
inode *inMemoryInodeStruct
inodeNumberDecodedAsInodeNumber InodeNumber
inodeNumberDecodedAsUint64 uint64
inodeRWLock *dlm.RWLockStruct
modeAdornedWithInodeType InodeMode
ok bool
parentInodeNumberDecodedAsInodeNumber InodeNumber
parentInodeNumberDecodedAsUint64 uint64
payload sortedmap.BPlusTree
snapShotIDType headhunter.SnapShotIDType
)
snapShotIDType, _, inodeNumberDecodedAsUint64 = vS.headhunterVolumeHandle.SnapShotU64Decode(uint64(inodeNumber))
if headhunter.SnapShotIDTypeLive != snapShotIDType {
err = fmt.Errorf("PatchInode(inodeNumber==0x%016X,,,,,,,) must provide a non-SnapShot inodeNumber", inodeNumber)
return
}
inodeNumberDecodedAsInodeNumber = InodeNumber(inodeNumberDecodedAsUint64)
switch inodeType {
case DirType:
if 2 != linkCount {
err = fmt.Errorf("PatchInode(inodeNumber==0x%016X,inodeType==DirType,linkCount==%v,,,,,) must set linkCount to 2", inodeNumber, linkCount)
return
}
if InodeNumber(0) == parentInodeNumber {
err = fmt.Errorf("PatchInode(inodeNumber==0x%016X,inodeType==DirType,,,,,parentInodeNumber==0,) must provide a non-zero parentInodeNumber", inodeNumber)
return
}
if (RootDirInodeNumber == inodeNumber) && (RootDirInodeNumber != parentInodeNumber) {
err = fmt.Errorf("PatchInode(inodeNumber==RootDirInodeNumber,inodeType==DirType,,,,,parentInodeNumber==0x%016X,) must provide RootDirInode's parent as also RootDirInodeNumber", parentInodeNumber)
return
}
snapShotIDType, _, parentInodeNumberDecodedAsUint64 = vS.headhunterVolumeHandle.SnapShotU64Decode(uint64(inodeNumber))
if headhunter.SnapShotIDTypeLive != snapShotIDType {
err = fmt.Errorf("PatchInode(inodeNumber==0x%016X,inodeType==DirType,,,,,parentInodeNumber==0x%016X,) must provide a non-SnapShot parentInodeNumber", inodeNumber, parentInodeNumber)
return
}
parentInodeNumberDecodedAsInodeNumber = InodeNumber(parentInodeNumberDecodedAsUint64)
case FileType:
if 0 == linkCount {
err = fmt.Errorf("PatchInode(inodeNumber==0x%016X,inodeType==FileType,linkCount==0,,,,,) must provide a non-zero linkCount", inodeNumber)
return
}
case SymlinkType:
if 0 == linkCount {
err = fmt.Errorf("PatchInode(inodeNumber==0x%016X,inodeType==SymlinkType,linkCount==0,,,,,) must provide a non-zero linkCount", inodeNumber)
return
}
if "" == symlinkTarget {
err = fmt.Errorf("PatchInode(inodeNumber==0x%016X,inodeType==SymlinkType,,,,,,symlinkTarget==\"\") must provide a non-empty symlinkTarget", inodeNumber)
return
}
default:
err = fmt.Errorf("PatchInode(inodeNumber==0x%016X,inodeType==%v,,,,,,) must provide a inodeType of DirType(%v), FileType(%v), or SymlinkType(%v)", inodeNumber, inodeType, DirType, FileType, SymlinkType)
return
}
modeAdornedWithInodeType, err = determineMode(mode, inodeType)
if nil != err {
err = fmt.Errorf("PatchInode(inodeNumber==0x%016X,inodeType==%v,,mode==0o%011o,,,,) failed: %v", inodeNumber, inodeType, mode, err)
return
}
vS.Lock()
callerID = dlm.GenerateCallerID()
inodeRWLock, _ = vS.InitInodeLock(inodeNumber, callerID)
err = inodeRWLock.TryWriteLock()
if nil != err {
vS.Unlock()
err = fmt.Errorf("PatchInode(inodeNumber==0x%016X,,,,,,,) couldn't create a *dlm.RWLockStruct: %v", inodeNumber, err)
return
}
inode, ok, err = vS.inodeCacheFetchWhileLocked(inodeNumber)
if nil != err {
_ = inodeRWLock.Unlock()
vS.Unlock()
err = fmt.Errorf("PatchInode(inodeNumber==0x%016X,,,,,,,) couldn't search inodeCache for pre-existing inode: %v", inodeNumber, err)
return
}
if ok {
if inode.dirty {
_ = inodeRWLock.Unlock()
vS.Unlock()
err = fmt.Errorf("PatchInode(inodeNumber==0x%016X,,,,,,,) of dirty Inode is not allowed", inodeNumber)
return
}
ok, err = vS.inodeCacheDropWhileLocked(inode)
if nil != err {
_ = inodeRWLock.Unlock()
vS.Unlock()
err = fmt.Errorf("PatchInode(inodeNumber==0x%016X,,,,,,,) drop of pre-existing inode from inodeCache failed: %v", inodeNumber, err)
return
}
if !ok {
_ = inodeRWLock.Unlock()
vS.Unlock()
err = fmt.Errorf("PatchInode(inodeNumber==0x%016X,,,,,,,) drop of pre-existing inode from inodeCache returned !ok", inodeNumber)
return
}
}
inode = vS.makeInMemoryInodeWithThisInodeNumber(inodeType, modeAdornedWithInodeType, userID, groupID, inodeNumberDecodedAsInodeNumber, true)
inode.dirty = true
inode.onDiskInodeV1Struct.LinkCount = linkCount
switch inodeType {
case DirType:
payload = sortedmap.NewBPlusTree(
vS.maxEntriesPerDirNode,
sortedmap.CompareString,
&dirInodeCallbacks{treeNodeLoadable{inode: inode}},
globals.dirEntryCache)
ok, err = payload.Put(".", inodeNumberDecodedAsInodeNumber)
if nil != err {
err = fmt.Errorf("PatchInode(inodeNumber==0x%016X,inodeType==DirType,,,,,,) failed to insert \".\" dirEntry: %v", inodeNumber, err)
panic(err)
}
if !ok {
err = fmt.Errorf("PatchInode(inodeNumber==0x%016X,inodeType==DirType,,,,,,) insert \".\" dirEntry got a !ok", inodeNumber)
panic(err)
}
ok, err = payload.Put("..", parentInodeNumberDecodedAsInodeNumber)
if nil != err {
err = fmt.Errorf("PatchInode(inodeNumber==0x%016X,inodeType==DirType,,,,,parentInodeNumber==0x%016X,) failed to insert \"..\" dirEntry: %v", inodeNumber, parentInodeNumber, err)
panic(err)
}
if !ok {
err = fmt.Errorf("PatchInode(inodeNumber==0x%016X,inodeType==DirType,,,,,parentInodeNumber==0x%016X,) insert \"..\" dirEntry got a !ok", inodeNumber, parentInodeNumber)
panic(err)
}
inode.payload = payload
inode.onDiskInodeV1Struct.SymlinkTarget = ""
case FileType:
payload = sortedmap.NewBPlusTree(
vS.maxExtentsPerFileNode,
sortedmap.CompareUint64,
&fileInodeCallbacks{treeNodeLoadable{inode: inode}},
globals.fileExtentMapCache)
inode.payload = payload
inode.onDiskInodeV1Struct.SymlinkTarget = ""
case SymlinkType:
inode.payload = nil
inode.onDiskInodeV1Struct.SymlinkTarget = symlinkTarget
}
ok, err = vS.inodeCacheInsertWhileLocked(inode)
if nil != err {
err = fmt.Errorf("PatchInode(inodeNumber==0x%016X,inodeType==DirType,,,,,,) failed to insert inode in inodeCache: %v", inodeNumber, err)
panic(err)
}
if !ok {
err = fmt.Errorf("PatchInode(inodeNumber==0x%016X,inodeType==DirType,,,,,,) insert of inode in inodeCache got a !ok", inodeNumber)
panic(err)
}
_ = inodeRWLock.Unlock()
vS.Unlock()
err = vS.flushInode(inode)
if nil != err {
err = fmt.Errorf("PatchInode(inodeNumber==0x%016X,,,,,,,) failed to flush: %v", inodeNumber, err)
panic(err)
}
return
}
func (inMemoryInode *inMemoryInodeStruct) convertToOnDiskInodeV1() (onDiskInodeV1 *onDiskInodeV1Struct, err error) {
onDiskInode := inMemoryInode.onDiskInodeV1Struct
if (DirType == inMemoryInode.InodeType) || (FileType == inMemoryInode.InodeType) {
content := inMemoryInode.payload.(sortedmap.BPlusTree)
payloadObjectNumber, payloadObjectOffset, payloadObjectLength, flushErr := content.Flush(false)
if nil != flushErr {
panic(flushErr)
}
pruneErr := content.Prune()
if nil != pruneErr {
panic(pruneErr)
}
if onDiskInodeV1PayloadObjectOffset != payloadObjectOffset {
flushErr = fmt.Errorf("Logic Error: content.Flush() should have returned payloadObjectOffset == %v", onDiskInodeV1PayloadObjectOffset)
panic(flushErr)
}
onDiskInode.PayloadObjectNumber = payloadObjectNumber
onDiskInode.PayloadObjectLength = payloadObjectLength
}
// maps are refernce types, so this needs to be copied manually
onDiskInode.StreamMap = make(map[string][]byte)
for key, value := range inMemoryInode.StreamMap {
valueCopy := make([]byte, len(value))
copy(valueCopy, value)
onDiskInode.StreamMap[key] = valueCopy
}
onDiskInode.LogSegmentMap = make(map[uint64]uint64)
for logSegmentNumber, logSegmentBytesUsed := range inMemoryInode.LogSegmentMap {
onDiskInode.LogSegmentMap[logSegmentNumber] = logSegmentBytesUsed
}
return &onDiskInode, nil
}
func (vS *volumeStruct) flushInode(inode *inMemoryInodeStruct) (err error) {
err = vS.flushInodes([]*inMemoryInodeStruct{inode})
return
}
func (vS *volumeStruct) flushInodeNumber(inodeNumber InodeNumber) (err error) {
err = vS.flushInodeNumbers([]InodeNumber{inodeNumber})
return
}
// REVIEW: Need to clearly explain what "flush" means (i.e. "to HH", not "to disk")
func (vS *volumeStruct) flushInodes(inodes []*inMemoryInodeStruct) (err error) {
var (
dirtyInodeNumbers []uint64
dirtyInodeRecBytes []byte
dirtyInodeRecs [][]byte
emptyLogSegments []uint64
emptyLogSegmentsThisInode []uint64
inode *inMemoryInodeStruct
logSegmentNumber uint64
logSegmentValidBytes uint64
onDiskInodeV1 *onDiskInodeV1Struct
onDiskInodeV1Buf []byte
payloadAsBPlusTree sortedmap.BPlusTree
payloadObjectLength uint64
payloadObjectNumber uint64
toFlushInodeNumbers []uint64
)
halter.Trigger(halter.InodeFlushInodesEntry)
defer halter.Trigger(halter.InodeFlushInodesExit)
toFlushInodeNumbers = make([]uint64, 0, len(inodes))
for _, inode = range inodes {
toFlushInodeNumbers = append(toFlushInodeNumbers, uint64(inode.InodeNumber))
}
evtlog.Record(evtlog.FormatFlushInodesEntry, vS.volumeName, toFlushInodeNumbers)
// Assemble slice of "dirty" inodes while flushing them
dirtyInodeNumbers = make([]uint64, 0, len(inodes))
dirtyInodeRecs = make([][]byte, 0, len(inodes))
emptyLogSegments = make([]uint64, 0)
for _, inode = range inodes {
if FileType == inode.InodeType {
err = vS.doFileInodeDataFlush(inode)
if nil != err {
evtlog.Record(evtlog.FormatFlushInodesErrorOnInode, vS.volumeName, uint64(inode.InodeNumber), err.Error())
logger.ErrorWithError(err)
err = blunder.AddError(err, blunder.InodeFlushError)
return
}
emptyLogSegmentsThisInode = make([]uint64, 0)
for logSegmentNumber, logSegmentValidBytes = range inode.LogSegmentMap {
if 0 == logSegmentValidBytes {
emptyLogSegmentsThisInode = append(emptyLogSegmentsThisInode, logSegmentNumber)
}
}
for _, logSegmentNumber = range emptyLogSegmentsThisInode {
delete(inode.LogSegmentMap, logSegmentNumber)
}
emptyLogSegments = append(emptyLogSegments, emptyLogSegmentsThisInode...)
}
if SymlinkType != inode.InodeType {
// (FileType == inode.InodeType || (DirType == inode.InodeType)
payloadAsBPlusTree = inode.payload.(sortedmap.BPlusTree)
payloadObjectNumber, _, payloadObjectLength, err = payloadAsBPlusTree.Flush(false)
if nil != err {
evtlog.Record(evtlog.FormatFlushInodesErrorOnInode, vS.volumeName, uint64(inode.InodeNumber), err.Error())
logger.ErrorWithError(err)
err = blunder.AddError(err, blunder.InodeFlushError)
return
}
if payloadObjectNumber > inode.PayloadObjectNumber {
if !inode.dirty {
err = fmt.Errorf("Logic error: inode.dirty should have been true")
evtlog.Record(evtlog.FormatFlushInodesErrorOnInode, vS.volumeName, uint64(inode.InodeNumber), err.Error())
logger.ErrorWithError(err)
err = blunder.AddError(err, blunder.InodeFlushError)
return
}
// REVIEW: What if cache pressure flushed before we got here?
// Is it possible that Number doesn't get updated?
if inode.PayloadObjectNumber != 0 {
logger.Tracef("flushInodes(): volume '%s' %v inode %d: updating Payload"+
" from Object %016X to %016X bytes %d to %d",
vS.volumeName, inode.InodeType, inode.InodeNumber,
inode.PayloadObjectNumber, payloadObjectNumber,
inode.PayloadObjectLength, payloadObjectLength)
}
inode.PayloadObjectNumber = payloadObjectNumber
inode.PayloadObjectLength = payloadObjectLength
evtlog.Record(evtlog.FormatFlushInodesDirOrFilePayloadObjectNumberUpdated, vS.volumeName, uint64(inode.InodeNumber), payloadObjectNumber)
}
}
if inode.dirty {
onDiskInodeV1, err = inode.convertToOnDiskInodeV1()
if nil != err {
evtlog.Record(evtlog.FormatFlushInodesErrorOnInode, vS.volumeName, uint64(inode.InodeNumber), err.Error())
logger.ErrorWithError(err)
err = blunder.AddError(err, blunder.InodeFlushError)
return