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api_internal.go
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api_internal.go
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// Copyright (c) 2015-2021, NVIDIA CORPORATION.
// SPDX-License-Identifier: Apache-2.0
// Package fs, sitting on top of the inode manager, defines the filesystem exposed by ProxyFS.
package fs
import (
"bytes"
"container/list"
"fmt"
"math"
"path"
"strings"
"syscall"
"time"
"github.com/swiftstack/ProxyFS/blunder"
"github.com/swiftstack/ProxyFS/dlm"
"github.com/swiftstack/ProxyFS/inode"
"github.com/swiftstack/ProxyFS/logger"
"github.com/swiftstack/ProxyFS/utils"
)
// Shorthand for our internal API debug log id; global to the package
var internalDebug = logger.DbgInternal
type symlinkFollowState struct {
seen map[inode.InodeNumber]bool
traversed int
}
// Let us sort an array of directory and file names
type dirAndFileName struct {
dirName string
fileName string
}
// this has to be a named type to be a method receiver
type dirAndFileNameSlice []dirAndFileName
func (coll dirAndFileNameSlice) Len() int {
return len(coll)
}
func (coll dirAndFileNameSlice) Less(i int, j int) bool {
return coll[i].dirName < coll[j].dirName
}
func (coll dirAndFileNameSlice) Swap(i int, j int) {
coll[i], coll[j] = coll[j], coll[i]
}
// trackInFlightFileInodeData is called to ensure a timely Flush occurs.
//
// Only Write() will call this while holding a WriteLock on the fileInode
// either just before or just after its call to inode.Write().
func (vS *volumeStruct) trackInFlightFileInodeData(inodeNumber inode.InodeNumber) {
var (
inFlightFileInodeData *inFlightFileInodeDataStruct
ok bool
)
globals.Lock()
vS.dataMutex.Lock()
inFlightFileInodeData, ok = vS.inFlightFileInodeDataMap[inodeNumber]
if !ok {
inFlightFileInodeData = &inFlightFileInodeDataStruct{
InodeNumber: inodeNumber,
volStruct: vS,
control: make(chan bool, inFlightFileInodeDataControlBuffering),
}
vS.inFlightFileInodeDataMap[inodeNumber] = inFlightFileInodeData
inFlightFileInodeData.globalsListElement = globals.inFlightFileInodeDataList.PushBack(inFlightFileInodeData)
inFlightFileInodeData.wg.Add(1)
go inFlightFileInodeData.inFlightFileInodeDataTracker()
}
vS.dataMutex.Unlock()
globals.Unlock()
}
// untrackInFlightInodeData is called once it is known a Flush() is no longer needed
// or to actually request a Flush() [as would be the case during unmounting a volume].
func (vS *volumeStruct) untrackInFlightFileInodeData(inodeNumber inode.InodeNumber, flushFirst bool) {
var (
inFlightFileInodeData *inFlightFileInodeDataStruct
ok bool
)
globals.Lock()
vS.dataMutex.Lock()
inFlightFileInodeData, ok = vS.inFlightFileInodeDataMap[inodeNumber]
if !ok {
vS.dataMutex.Unlock()
globals.Unlock()
return
}
delete(vS.inFlightFileInodeDataMap, inodeNumber)
if nil != inFlightFileInodeData.globalsListElement {
_ = globals.inFlightFileInodeDataList.Remove(inFlightFileInodeData.globalsListElement)
inFlightFileInodeData.globalsListElement = nil
}
inFlightFileInodeData.control <- flushFirst
vS.dataMutex.Unlock()
globals.Unlock()
if flushFirst {
inFlightFileInodeData.wg.Wait()
}
}
// untrackInFlightFileInodeDataAll is called to flush all current elements
// of vS.inFlightFileInodeDataMap (if any) during SIGHUP or Down().
func (vS *volumeStruct) untrackInFlightFileInodeDataAll() {
var (
inFlightFileInodeNumber inode.InodeNumber
inFlightFileInodeNumbers []inode.InodeNumber
inFlightFileInodeNumbersCapacity int
)
// Snapshot list of inode.InodeNumber's currently in vS.inFlightFileInodeDataMap
vS.dataMutex.Lock()
inFlightFileInodeNumbersCapacity = len(vS.inFlightFileInodeDataMap)
if 0 == inFlightFileInodeNumbersCapacity {
vS.dataMutex.Unlock()
return
}
inFlightFileInodeNumbers = make([]inode.InodeNumber, 0, inFlightFileInodeNumbersCapacity)
for inFlightFileInodeNumber, _ = range vS.inFlightFileInodeDataMap {
inFlightFileInodeNumbers = append(inFlightFileInodeNumbers, inFlightFileInodeNumber)
}
vS.dataMutex.Unlock()
// Now go flush each of those
for _, inFlightFileInodeNumber = range inFlightFileInodeNumbers {
vS.untrackInFlightFileInodeData(inFlightFileInodeNumber, true)
}
}
func (vS *volumeStruct) inFlightFileInodeDataFlusher(inodeNumber inode.InodeNumber) {
var (
err error
inodeLock *dlm.RWLockStruct
stillExists bool
)
// Act as if a package fs client called Flush()...
inodeLock, err = vS.inodeVolumeHandle.InitInodeLock(inodeNumber, nil)
if nil != err {
logger.PanicfWithError(err, "InitInodeLock() for volume '%s' inode %v failed", vS.volumeName, inodeNumber)
}
err = inodeLock.WriteLock()
if nil != err {
logger.PanicfWithError(err, "dlm.Writelock() for volume '%s' inode %v failed", vS.volumeName, inodeNumber)
}
stillExists = vS.inodeVolumeHandle.Access(inodeNumber, inode.InodeRootUserID, inode.InodeGroupID(0), nil, inode.F_OK,
inode.NoOverride)
if stillExists {
err = vS.inodeVolumeHandle.Flush(inodeNumber, false)
if nil == err {
vS.untrackInFlightFileInodeData(inodeNumber, false)
} else {
logger.ErrorfWithError(err, "Flush of file data failed on volume '%s' inode %v", vS.volumeName, inodeNumber)
}
}
err = inodeLock.Unlock()
if nil != err {
logger.PanicfWithError(err, "dlm.Unlock() for volume '%s' inode %v failed", vS.volumeName, inodeNumber)
}
}
func (inFlightFileInodeData *inFlightFileInodeDataStruct) inFlightFileInodeDataTracker() {
var (
flushFirst bool
)
logger.Tracef("fs.inFlightFileInodeDataTracker(): waiting to flush volume '%s' inode %v",
inFlightFileInodeData.volStruct.volumeName, inFlightFileInodeData.InodeNumber)
select {
case flushFirst = <-inFlightFileInodeData.control:
// All we needed was the value of flushFirst from control chan
case <-time.After(inFlightFileInodeData.volStruct.maxFlushTime):
flushFirst = true
}
logger.Tracef("fs.inFlightFileInodeDataTracker(): flush starting for volume '%s' inode %v flushfirst %t",
inFlightFileInodeData.volStruct.volumeName, inFlightFileInodeData.InodeNumber, flushFirst)
if flushFirst {
inFlightFileInodeData.volStruct.inFlightFileInodeDataFlusher(inFlightFileInodeData.InodeNumber)
}
inFlightFileInodeData.wg.Done()
}
func fetchVolumeHandleByAccountName(accountName string) (volumeHandle VolumeHandle, err error) {
var (
ok bool
vS *volumeStruct
volumeName string
)
startTime := time.Now()
defer func() {
globals.FetchVolumeHandleUsec.Add(uint64(time.Since(startTime) / time.Microsecond))
if err != nil {
globals.FetchVolumeHandleErrors.Add(1)
}
}()
globals.Lock()
volumeName, ok = inode.AccountNameToVolumeName(accountName)
if !ok {
err = fmt.Errorf("Unknown accountName passed to mountByAccountName(): \"%s\"", accountName)
err = blunder.AddError(err, blunder.NotFoundError)
globals.Unlock()
return
}
vS, ok = globals.volumeMap[volumeName]
if !ok {
err = fmt.Errorf("Unknown volumeName computed by mountByAccountName(): \"%s\"", volumeName)
err = blunder.AddError(err, blunder.NotFoundError)
globals.Unlock()
return
}
globals.Unlock()
volumeHandle = vS
err = nil
return
}
func fetchVolumeHandleByVolumeName(volumeName string) (volumeHandle VolumeHandle, err error) {
var (
ok bool
vS *volumeStruct
)
startTime := time.Now()
defer func() {
globals.FetchVolumeHandleUsec.Add(uint64(time.Since(startTime) / time.Microsecond))
if err != nil {
globals.FetchVolumeHandleErrors.Add(1)
}
}()
globals.Lock()
vS, ok = globals.volumeMap[volumeName]
if !ok {
err = fmt.Errorf("Unknown volumeName passed to mountByVolumeName(): \"%s\"", volumeName)
err = blunder.AddError(err, blunder.NotFoundError)
globals.Unlock()
return
}
globals.Unlock()
volumeHandle = vS
err = nil
return
}
func (vS *volumeStruct) Access(userID inode.InodeUserID, groupID inode.InodeGroupID, otherGroupIDs []inode.InodeGroupID, inodeNumber inode.InodeNumber, accessMode inode.InodeMode) (accessReturn bool) {
startTime := time.Now()
defer func() {
globals.AccessUsec.Add(uint64(time.Since(startTime) / time.Microsecond))
}()
vS.jobRWMutex.RLock()
defer vS.jobRWMutex.RUnlock()
accessReturn = vS.inodeVolumeHandle.Access(inodeNumber, userID, groupID, otherGroupIDs, accessMode,
inode.NoOverride)
return
}
func (vS *volumeStruct) CallInodeToProvisionObject() (pPath string, err error) {
startTime := time.Now()
defer func() {
globals.CallInodeToProvisionObjectUsec.Add(uint64(time.Since(startTime) / time.Microsecond))
if err != nil {
globals.CallInodeToProvisionObjectErrors.Add(1)
}
}()
vS.jobRWMutex.RLock()
defer vS.jobRWMutex.RUnlock()
pPath, err = vS.inodeVolumeHandle.ProvisionObject()
return
}
func (vS *volumeStruct) Create(userID inode.InodeUserID, groupID inode.InodeGroupID, otherGroupIDs []inode.InodeGroupID, dirInodeNumber inode.InodeNumber, basename string, filePerm inode.InodeMode) (fileInodeNumber inode.InodeNumber, err error) {
startTime := time.Now()
defer func() {
globals.CreateUsec.Add(uint64(time.Since(startTime) / time.Microsecond))
if err != nil {
globals.CreateErrors.Add(1)
}
}()
vS.jobRWMutex.RLock()
defer vS.jobRWMutex.RUnlock()
err = validateBaseName(basename)
if err != nil {
return 0, err
}
// Lock the directory inode before doing the link
dirInodeLock, err := vS.inodeVolumeHandle.InitInodeLock(dirInodeNumber, nil)
if err != nil {
return 0, err
}
err = dirInodeLock.WriteLock()
if err != nil {
return 0, err
}
defer dirInodeLock.Unlock()
if !vS.inodeVolumeHandle.Access(dirInodeNumber, userID, groupID, otherGroupIDs, inode.F_OK,
inode.NoOverride) {
return 0, blunder.NewError(blunder.NotFoundError, "ENOENT")
}
if !vS.inodeVolumeHandle.Access(dirInodeNumber, userID, groupID, otherGroupIDs, inode.W_OK|inode.X_OK,
inode.NoOverride) {
return 0, blunder.NewError(blunder.PermDeniedError, "EACCES")
}
// create the file and add it to the directory
fileInodeNumber, err = vS.inodeVolumeHandle.CreateFile(filePerm, userID, groupID)
if err != nil {
return 0, err
}
err = vS.inodeVolumeHandle.Link(dirInodeNumber, basename, fileInodeNumber, false)
if err != nil {
destroyErr := vS.inodeVolumeHandle.Destroy(fileInodeNumber)
if destroyErr != nil {
logger.WarnfWithError(destroyErr, "couldn't destroy inode %v after failed Link() in fs.Create", fileInodeNumber)
}
return 0, err
}
return fileInodeNumber, nil
}
func (vS *volumeStruct) DefragmentFile(userID inode.InodeUserID, groupID inode.InodeGroupID, otherGroupIDs []inode.InodeGroupID, fileInodeNumber inode.InodeNumber) (err error) {
var (
eofReached bool
fileOffset uint64
inodeLock *dlm.RWLockStruct
inodeType inode.InodeType
)
startTime := time.Now()
defer func() {
globals.DefragmentFileUsec.Add(uint64(time.Since(startTime) / time.Microsecond))
if err != nil {
globals.DefragmentFileErrors.Add(1)
}
}()
vS.jobRWMutex.RLock()
inodeLock, err = vS.inodeVolumeHandle.InitInodeLock(fileInodeNumber, nil)
if nil != err {
vS.jobRWMutex.RUnlock()
return
}
err = inodeLock.WriteLock()
if nil != err {
vS.jobRWMutex.RUnlock()
return
}
if !vS.inodeVolumeHandle.Access(fileInodeNumber, userID, groupID, otherGroupIDs, inode.F_OK,
inode.NoOverride) {
_ = inodeLock.Unlock()
vS.jobRWMutex.RUnlock()
err = blunder.NewError(blunder.NotFoundError, "ENOENT")
return
}
if !vS.inodeVolumeHandle.Access(fileInodeNumber, userID, groupID, otherGroupIDs, inode.W_OK,
inode.OwnerOverride) {
_ = inodeLock.Unlock()
vS.jobRWMutex.RUnlock()
err = blunder.NewError(blunder.PermDeniedError, "EACCES")
return
}
inodeType, err = vS.inodeVolumeHandle.GetType(fileInodeNumber)
if nil != err {
_ = inodeLock.Unlock()
vS.jobRWMutex.RUnlock()
logger.ErrorfWithError(err, "couldn't get type for inode %v", fileInodeNumber)
return
}
// Make sure the inode number is for a file inode
if inodeType != inode.FileType {
_ = inodeLock.Unlock()
vS.jobRWMutex.RUnlock()
err = fmt.Errorf("%s: expected inode %v to be a file inode, got %v", utils.GetFnName(), fileInodeNumber, inodeType)
logger.ErrorWithError(err)
err = blunder.AddError(err, blunder.NotFileError)
return
}
fileOffset = 0
for {
fileOffset, eofReached, err = vS.inodeVolumeHandle.DefragmentFile(fileInodeNumber, fileOffset, vS.fileDefragmentChunkSize)
_ = inodeLock.Unlock()
vS.jobRWMutex.RUnlock()
if nil != err {
return
}
if eofReached {
return
}
time.Sleep(vS.fileDefragmentChunkDelay)
vS.jobRWMutex.RLock()
err = inodeLock.WriteLock()
if nil != err {
vS.jobRWMutex.RUnlock()
return
}
}
}
func (vS *volumeStruct) FetchExtentMapChunk(userID inode.InodeUserID, groupID inode.InodeGroupID, otherGroupIDs []inode.InodeGroupID, fileInodeNumber inode.InodeNumber, fileOffset uint64, maxEntriesFromFileOffset int64, maxEntriesBeforeFileOffset int64) (extentMapChunk *inode.ExtentMapChunkStruct, err error) {
var (
inodeLock *dlm.RWLockStruct
inodeType inode.InodeType
)
startTime := time.Now()
defer func() {
globals.FetchExtentMapChunkUsec.Add(uint64(time.Since(startTime) / time.Microsecond))
if err != nil {
globals.FetchExtentMapChunkErrors.Add(1)
}
}()
vS.jobRWMutex.RLock()
defer vS.jobRWMutex.RUnlock()
inodeLock, err = vS.inodeVolumeHandle.InitInodeLock(fileInodeNumber, nil)
if nil != err {
return
}
err = inodeLock.ReadLock()
if nil != err {
return
}
defer inodeLock.Unlock()
if !vS.inodeVolumeHandle.Access(fileInodeNumber, userID, groupID, otherGroupIDs, inode.F_OK,
inode.NoOverride) {
err = blunder.NewError(blunder.NotFoundError, "ENOENT")
return
}
if !vS.inodeVolumeHandle.Access(fileInodeNumber, userID, groupID, otherGroupIDs, inode.R_OK,
inode.OwnerOverride) {
err = blunder.NewError(blunder.PermDeniedError, "EACCES")
return
}
inodeType, err = vS.inodeVolumeHandle.GetType(fileInodeNumber)
if nil != err {
logger.ErrorfWithError(err, "couldn't get type for inode %v", fileInodeNumber)
return
}
// Make sure the inode number is for a file inode
if inodeType != inode.FileType {
err = fmt.Errorf("%s: expected inode %v to be a file inode, got %v", utils.GetFnName(), fileInodeNumber, inodeType)
logger.ErrorWithError(err)
err = blunder.AddError(err, blunder.NotFileError)
return
}
extentMapChunk, err = vS.inodeVolumeHandle.FetchExtentMapChunk(fileInodeNumber, fileOffset, maxEntriesFromFileOffset, maxEntriesBeforeFileOffset)
return
}
// doInlineCheckpointIfEnabled is called whenever we must guarantee that reported state changes
// are, indeed, persisted. Absent any sort of persistent transaction log, this means performing
// a checkpoint unfortunately.
//
// Currently, only explicitly invoked Flushes trigger this. But, actually, any Swift/S3 API call
// that modifies Objects or (what the client thinks are) Containers should also.
//
// TODO is to determine where else a call to this func should also be made.
//
func (vS *volumeStruct) doInlineCheckpointIfEnabled() {
var (
err error
)
if !vS.doCheckpointPerFlush {
return
}
err = vS.headhunterVolumeHandle.DoCheckpoint()
if nil != err {
logger.Fatalf("fs.doInlineCheckpoint() call to headhunter.DoCheckpoint() failed: %v", err)
}
}
func (vS *volumeStruct) Flush(userID inode.InodeUserID, groupID inode.InodeGroupID, otherGroupIDs []inode.InodeGroupID, inodeNumber inode.InodeNumber) (err error) {
startTime := time.Now()
defer func() {
globals.FlushUsec.Add(uint64(time.Since(startTime) / time.Microsecond))
if err != nil {
globals.FlushErrors.Add(1)
}
}()
vS.jobRWMutex.RLock()
defer vS.jobRWMutex.RUnlock()
inodeLock, err := vS.inodeVolumeHandle.InitInodeLock(inodeNumber, nil)
if err != nil {
return
}
err = inodeLock.WriteLock()
if err != nil {
return
}
defer inodeLock.Unlock()
if !vS.inodeVolumeHandle.Access(inodeNumber, userID, groupID, otherGroupIDs, inode.F_OK,
inode.NoOverride) {
return blunder.NewError(blunder.NotFoundError, "ENOENT")
}
// Note: We'd normally check EACCES here...but there are paths in FUSE (e.g. when files are
// closed) that end up calling Flush()...even though the file was "opened" ReadOnly.
// This is presumably to support updated of ATime and such. In any event, an EACCESS
// check would fail if the caller actually only had ReadOnly access to the Inode, so
// we won't be doing the check here.
err = vS.inodeVolumeHandle.Flush(inodeNumber, false)
vS.untrackInFlightFileInodeData(inodeNumber, false)
vS.doInlineCheckpointIfEnabled()
return
}
func (vS *volumeStruct) getFileLockList(inodeNumber inode.InodeNumber) (flockList *list.List) {
vS.dataMutex.Lock()
defer vS.dataMutex.Unlock()
flockList, ok := vS.FLockMap[inodeNumber]
if !ok {
flockList = new(list.List)
vS.FLockMap[inodeNumber] = flockList
}
return
}
// Check for lock conflict with other Pids, if there is a conflict then it will return the first occurance of conflicting range.
func checkConflict(elm *FlockStruct, flock *FlockStruct) bool {
if flock.Pid == elm.Pid {
return false
}
if (elm.Start+elm.Len) <= flock.Start || (flock.Start+flock.Len) <= elm.Start {
return false
}
if (flock.Type == syscall.F_WRLCK) || (elm.Type == syscall.F_WRLCK) {
return true
}
return false
}
func (vS *volumeStruct) verifyLock(inodeNumber inode.InodeNumber, flock *FlockStruct) (conflictLock *FlockStruct) {
flockList := vS.getFileLockList(inodeNumber)
for e := flockList.Front(); e != nil; e = e.Next() {
elm := e.Value.(*FlockStruct)
if checkConflict(elm, flock) == true {
return elm
}
}
return nil
}
// Insert a file lock range to corresponding lock list for the pid.
// Assumption: There is no lock conflict and the range that is being inserted has no conflict and is free.
func (vS *volumeStruct) fileLockInsert(inodeNumber inode.InodeNumber, inFlock *FlockStruct) (err error) {
err = nil
flockList := vS.getFileLockList(inodeNumber)
overlapList := new(list.List)
var beforeElm *list.Element // Refers to the immediate element that starts before the start of the range.
var afterElm *list.Element // Refers to the immediate element that starts after the end of the range.
// flockList is sorted by starting offset of the range.
// Inserting a range happens in two steps. 1) Check if there is any conflict and also identify the
// point in the list where the entry will be added (before and after elements) 2) Then check if
// the range can extend the before element, if so adjust it. 3) Simillarly, check if the after
// element can be collapsed if it forms a contiguous range.
for e := flockList.Front(); e != nil; e = e.Next() {
elm := e.Value.(*FlockStruct)
if (elm.Start + elm.Len) <= inFlock.Start {
beforeElm = e
continue
}
if elm.Start > (inFlock.Start + inFlock.Len) {
afterElm = e
if overlapList.Len() == 0 {
flockList.InsertBefore(inFlock, e)
return
}
break
}
if checkConflict(elm, inFlock) {
err = blunder.AddError(nil, blunder.TryAgainError)
return
}
if elm.Pid == inFlock.Pid {
overlapList.PushBack(e)
}
}
if overlapList.Len() == 0 {
if beforeElm != nil {
elm := beforeElm.Value.(*FlockStruct)
if elm.Pid == inFlock.Pid && elm.Type == inFlock.Type && (elm.Start+elm.Len) == inFlock.Start {
elm.Len = inFlock.Start + inFlock.Len - elm.Len
} else {
flockList.InsertAfter(inFlock, beforeElm)
}
} else {
flockList.PushBack(inFlock)
}
return
}
// Look at the last element in the overlapping list
lastEnt := overlapList.Back()
e := lastEnt.Value.(*list.Element)
elm := e.Value.(*FlockStruct)
if (elm.Start + elm.Len) > (inFlock.Start + inFlock.Len) {
inFlock.Len = (elm.Start + elm.Len) - inFlock.Start
}
// We can delete all the entries in the overlapping list. These entries are replaced by
// the range we are inserting.
for e := overlapList.Front(); e != nil; e = e.Next() {
entry := e.Value.(*list.Element)
flockList.Remove(entry)
}
// Now adjust the before and after entries:
// First adjust the after:
if afterElm != nil {
elm := afterElm.Value.(*FlockStruct)
if elm.Pid == inFlock.Pid && elm.Type == inFlock.Type && (inFlock.Start+inFlock.Len) == elm.Start {
// We can collapse the entry:
elm.Len = elm.Start + elm.Len - inFlock.Start
elm.Start = inFlock.Start
if beforeElm != nil {
belm := beforeElm.Value.(*FlockStruct)
if belm.Pid == elm.Pid && belm.Type == elm.Type && (belm.Start+belm.Len) == elm.Start {
belm.Len = elm.Start + elm.Len - belm.Start
flockList.Remove(afterElm)
}
}
return
}
}
if beforeElm != nil {
belm := beforeElm.Value.(*FlockStruct)
if belm.Pid == inFlock.Pid && belm.Type == inFlock.Type && (belm.Start+belm.Len) == inFlock.Start {
belm.Len = inFlock.Start + inFlock.Len - belm.Start
}
flockList.InsertAfter(inFlock, beforeElm)
return
}
if afterElm != nil {
flockList.InsertBefore(inFlock, afterElm)
} else {
flockList.PushBack(inFlock)
}
return
}
// Unlock a given range. All locks held in this range by the process (identified by Pid) are removed.
func (vS *volumeStruct) fileUnlock(inodeNumber inode.InodeNumber, inFlock *FlockStruct) (err error) {
flockList := vS.getFileLockList(inodeNumber)
if flockList == nil {
logger.Warnf("Unlock of a region not already locked - %+v", inFlock)
return
}
start := inFlock.Start
len := inFlock.Len
removeList := new(list.List)
for e := flockList.Front(); e != nil; e = e.Next() {
elm := e.Value.(*FlockStruct)
if elm.Pid != inFlock.Pid {
continue
}
if (elm.Start + elm.Len) < start {
continue
}
if elm.Start >= (start + len) {
break
}
// If the lock falls completely in the range, delete it.
if elm.Start >= start && (elm.Start+elm.Len) <= (start+len) {
removeList.PushBack(e)
continue
}
// This lock overlapps with the range - three possibalities 1) lock starts before the range, 2) end after range and 3) both.
elmLen := elm.Start + elm.Len // Save the original length, it is required in case of #3 (both)
if elm.Start < start { // Handle the first part - lock starts before the range.
elm.Len = start - elm.Start
}
if elmLen > (start + len) { // Lock extends beyond the unlock range.
if elm.Start > start { // case #2
// use the existing record
elm.Start = start + len
elm.Len = elmLen - elm.Start
break
}
// Create a new record - handle case #3 both (starts before the range and extends beyond the range)
elmTail := new(FlockStruct)
elmTail.Start = start + len
elmTail.Len = elmLen - elm.Start
elmTail.Pid = elm.Pid
elmTail.Type = elm.Type
elmTail.Whence = elm.Whence
flockList.InsertAfter(elmTail, e)
break
}
}
for e := removeList.Front(); e != nil; e = e.Next() {
elm := e.Value.(*list.Element)
flockList.Remove(elm)
}
return
}
// Implements file locking conforming to fcntl(2) locking description. F_SETLKW is not implemented. Supports F_SETLW and F_GETLW.
// whence: FS supports only SEEK_SET - starting from 0, since it does not manage file handles, caller is expected to supply the start and length relative to offset ZERO.
func (vS *volumeStruct) Flock(userID inode.InodeUserID, groupID inode.InodeGroupID, otherGroupIDs []inode.InodeGroupID, inodeNumber inode.InodeNumber, lockCmd int32, inFlock *FlockStruct) (outFlock *FlockStruct, err error) {
startTime := time.Now()
defer func() {
switch lockCmd {
case syscall.F_GETLK:
globals.FlockGetUsec.Add(uint64(time.Since(startTime) / time.Microsecond))
if err != nil {
globals.FlockGetErrors.Add(1)
}
case syscall.F_SETLK:
if inFlock.Type == syscall.F_UNLCK {
globals.FlockUnlockUsec.Add(uint64(time.Since(startTime) / time.Microsecond))
if err != nil {
globals.FlockUnlockErrors.Add(1)
}
} else if inFlock.Type == syscall.F_WRLCK || inFlock.Type == syscall.F_RDLCK {
globals.FlockLockUsec.Add(uint64(time.Since(startTime) / time.Microsecond))
if err != nil {
globals.FlockLockErrors.Add(1)
}
} else {
globals.FlockOtherErrors.Add(1)
}
default:
globals.FlockOtherErrors.Add(1)
}
}()
vS.jobRWMutex.RLock()
defer vS.jobRWMutex.RUnlock()
outFlock = inFlock
if lockCmd == syscall.F_SETLKW {
err = blunder.AddError(nil, blunder.NotSupportedError)
return
}
// Make sure the inode does not go away, while we are applying the flock.
inodeLock, err := vS.inodeVolumeHandle.InitInodeLock(inodeNumber, nil)
if err != nil {
return
}
err = inodeLock.ReadLock()
if err != nil {
return
}
defer inodeLock.Unlock()
if !vS.inodeVolumeHandle.Access(inodeNumber, userID, groupID, otherGroupIDs, inode.F_OK, inode.NoOverride) {
err = blunder.NewError(blunder.NotFoundError, "ENOENT")
return
}
if !vS.inodeVolumeHandle.Access(inodeNumber, userID, groupID, otherGroupIDs, inode.R_OK, inode.OwnerOverride) {
err = blunder.NewError(blunder.PermDeniedError, "EACCES")
return
}
if inFlock.Len == 0 { // If length is ZERO means treat it as whole file.
inFlock.Len = ^uint64(0)
}
switch lockCmd {
case syscall.F_GETLK:
conflictLock := vS.verifyLock(inodeNumber, inFlock)
if conflictLock != nil {
outFlock = conflictLock
err = blunder.AddError(nil, blunder.TryAgainError)
} else {
outFlock = inFlock
outFlock.Type = syscall.F_UNLCK
}
break
case syscall.F_SETLK:
if inFlock.Type == syscall.F_UNLCK {
err = vS.fileUnlock(inodeNumber, inFlock)
} else if inFlock.Type == syscall.F_WRLCK || inFlock.Type == syscall.F_RDLCK {
err = vS.fileLockInsert(inodeNumber, inFlock)
} else {
err = blunder.NewError(blunder.InvalidArgError, "EINVAL")
return
}
break
default:
err = blunder.NewError(blunder.InvalidArgError, "EINVAL")
return
}
return
}
func (vS *volumeStruct) getstatHelper(inodeNumber inode.InodeNumber, callerID dlm.CallerID) (stat Stat, err error) {
lockID, err := vS.inodeVolumeHandle.MakeLockID(inodeNumber)
if err != nil {
return
}
if !dlm.IsLockHeld(lockID, callerID, dlm.ANYLOCK) {
err = fmt.Errorf("%s: inode %v lock must be held before calling", utils.GetFnName(), inodeNumber)
return nil, blunder.AddError(err, blunder.NotFoundError)
}
stat, err = vS.getstatHelperWhileLocked(inodeNumber)
return
}
func (vS *volumeStruct) getstatHelperWhileLocked(inodeNumber inode.InodeNumber) (stat Stat, err error) {
var (
metadata *inode.MetadataStruct
)
metadata, err = vS.inodeVolumeHandle.GetMetadata(inodeNumber)
if nil != err {
return
}
stat = make(map[StatKey]uint64)
stat[StatCRTime] = uint64(metadata.CreationTime.UnixNano())
stat[StatMTime] = uint64(metadata.ModificationTime.UnixNano())
stat[StatCTime] = uint64(metadata.AttrChangeTime.UnixNano())
stat[StatATime] = uint64(metadata.AccessTime.UnixNano())
stat[StatSize] = metadata.Size
stat[StatNLink] = metadata.LinkCount
stat[StatFType] = uint64(metadata.InodeType)
stat[StatINum] = uint64(inodeNumber)
stat[StatMode] = uint64(metadata.Mode)
stat[StatUserID] = uint64(metadata.UserID)
stat[StatGroupID] = uint64(metadata.GroupID)
stat[StatNumWrites] = metadata.NumWrites
return
}
func (vS *volumeStruct) Getstat(userID inode.InodeUserID, groupID inode.InodeGroupID, otherGroupIDs []inode.InodeGroupID, inodeNumber inode.InodeNumber) (stat Stat, err error) {
startTime := time.Now()
defer func() {
globals.GetstatUsec.Add(uint64(time.Since(startTime) / time.Microsecond))
if err != nil {
globals.GetstatErrors.Add(1)
}
}()
vS.jobRWMutex.RLock()
defer vS.jobRWMutex.RUnlock()
inodeLock, err := vS.inodeVolumeHandle.InitInodeLock(inodeNumber, nil)
if err != nil {
return
}
err = inodeLock.ReadLock()
if err != nil {
return
}
defer inodeLock.Unlock()
// Call getstat helper function to do the work
return vS.getstatHelper(inodeNumber, inodeLock.GetCallerID())
}
func (vS *volumeStruct) getTypeHelper(inodeNumber inode.InodeNumber, callerID dlm.CallerID) (inodeType inode.InodeType, err error) {
lockID, err := vS.inodeVolumeHandle.MakeLockID(inodeNumber)
if err != nil {
return
}
if !dlm.IsLockHeld(lockID, callerID, dlm.ANYLOCK) {
err = fmt.Errorf("%s: inode %v lock must be held before calling.", utils.GetFnName(), inodeNumber)
err = blunder.AddError(err, blunder.NotFoundError)
return
}
inodeType, err = vS.inodeVolumeHandle.GetType(inodeNumber)
if err != nil {
logger.ErrorWithError(err, "couldn't get inode type")
return inodeType, err
}
return inodeType, nil
}
func (vS *volumeStruct) GetType(userID inode.InodeUserID, groupID inode.InodeGroupID, otherGroupIDs []inode.InodeGroupID, inodeNumber inode.InodeNumber) (inodeType inode.InodeType, err error) {
startTime := time.Now()
defer func() {
globals.GetTypeUsec.Add(uint64(time.Since(startTime) / time.Microsecond))
if err != nil {
globals.GetTypeErrors.Add(1)
}
}()
vS.jobRWMutex.RLock()
defer vS.jobRWMutex.RUnlock()
inodeLock, err := vS.inodeVolumeHandle.InitInodeLock(inodeNumber, nil)
if err != nil {
return
}