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goofys.go
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goofys.go
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// Copyright 2015 - 2017 Ka-Hing Cheung
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package internal
import (
"context"
"fmt"
"math/rand"
"mime"
"net/http"
"net/url"
"runtime/debug"
"strconv"
"strings"
"sync"
"syscall"
"time"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/awserr"
"github.com/aws/aws-sdk-go/aws/corehandlers"
"github.com/aws/aws-sdk-go/aws/credentials"
"github.com/aws/aws-sdk-go/aws/request"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/s3"
"github.com/jacobsa/fuse"
"github.com/jacobsa/fuse/fuseops"
"github.com/jacobsa/fuse/fuseutil"
"github.com/sirupsen/logrus"
)
// goofys is a Filey System written in Go. All the backend data is
// stored on S3 as is. It's a Filey System instead of a File System
// because it makes minimal effort at being POSIX
// compliant. Particularly things that are difficult to support on S3
// or would translate into more than one round-trip would either fail
// (rename non-empty dir) or faked (no per-file permission). goofys
// does not have a on disk data cache, and consistency model is
// close-to-open.
type Goofys struct {
fuseutil.NotImplementedFileSystem
bucket string
prefix string
flags *FlagStorage
umask uint32
awsConfig *aws.Config
sess *session.Session
s3 *s3.S3
v2Signer bool
gcs bool
sseType string
rootAttrs InodeAttributes
bufferPool *BufferPool
// A lock protecting the state of the file system struct itself (distinct
// from per-inode locks). Make sure to see the notes on lock ordering above.
mu sync.Mutex
// The next inode ID to hand out. We assume that this will never overflow,
// since even if we were handing out inode IDs at 4 GHz, it would still take
// over a century to do so.
//
// GUARDED_BY(mu)
nextInodeID fuseops.InodeID
// The collection of live inodes, keyed by inode ID. No ID less than
// fuseops.RootInodeID is ever used.
//
// INVARIANT: For all keys k, fuseops.RootInodeID <= k < nextInodeID
// INVARIANT: For all keys k, inodes[k].ID() == k
// INVARIANT: inodes[fuseops.RootInodeID] is missing or of type inode.DirInode
// INVARIANT: For all v, if IsDirName(v.Name()) then v is inode.DirInode
//
// GUARDED_BY(mu)
inodes map[fuseops.InodeID]*Inode
nextHandleID fuseops.HandleID
dirHandles map[fuseops.HandleID]*DirHandle
fileHandles map[fuseops.HandleID]*FileHandle
replicators *Ticket
restorers *Ticket
forgotCnt uint32
}
var s3Log = GetLogger("s3")
func NewGoofys(ctx context.Context, bucket string, awsConfig *aws.Config, flags *FlagStorage) *Goofys {
// Set up the basic struct.
fs := &Goofys{
bucket: bucket,
flags: flags,
umask: 0122,
}
colon := strings.Index(bucket, ":")
if colon != -1 {
fs.prefix = bucket[colon+1:]
fs.prefix = strings.Trim(fs.prefix, "/")
fs.prefix += "/"
fs.bucket = bucket[0:colon]
bucket = fs.bucket
}
if flags.DebugS3 {
awsConfig.LogLevel = aws.LogLevel(aws.LogDebug | aws.LogDebugWithRequestErrors)
s3Log.Level = logrus.DebugLevel
}
if strings.HasSuffix(flags.Endpoint, "/storage.googleapis.com") {
fs.gcs = true
}
fs.awsConfig = awsConfig
fs.sess = session.New(awsConfig)
fs.s3 = fs.newS3()
var isAws bool
var err error
if !fs.flags.RegionSet {
err, isAws = fs.detectBucketLocationByHEAD()
if err == nil {
// we detected a region header, this is probably AWS S3,
// or we can use anonymous access, or both
fs.sess = session.New(awsConfig)
fs.s3 = fs.newS3()
} else if err == fuse.ENOENT {
log.Errorf("bucket %v does not exist", fs.bucket)
return nil
} else {
// this is NOT AWS, we expect the request to fail with 403 if this is not
// an anonymous bucket
if err != syscall.EACCES {
log.Errorf("Unable to access '%v': %v", fs.bucket, err)
}
}
}
// try again with the credential to make sure
err = mapAwsError(fs.testBucket())
if err != nil {
if !isAws {
// EMC returns 403 because it doesn't support v4 signing
// swift3, ceph-s3 returns 400
// Amplidata just gives up and return 500
if err == syscall.EACCES || err == fuse.EINVAL || err == syscall.EAGAIN {
fs.fallbackV2Signer()
err = mapAwsError(fs.testBucket())
}
}
if err != nil {
log.Errorf("Unable to access '%v': %v", fs.bucket, err)
return nil
}
}
go fs.cleanUpOldMPU()
if flags.UseKMS {
//SSE header string for KMS server-side encryption (SSE-KMS)
fs.sseType = s3.ServerSideEncryptionAwsKms
} else if flags.UseSSE {
//SSE header string for non-KMS server-side encryption (SSE-S3)
fs.sseType = s3.ServerSideEncryptionAes256
}
now := time.Now()
fs.rootAttrs = InodeAttributes{
Size: 4096,
Mtime: now,
}
fs.bufferPool = BufferPool{}.Init()
fs.nextInodeID = fuseops.RootInodeID + 1
fs.inodes = make(map[fuseops.InodeID]*Inode)
root := NewInode(fs, nil, aws.String(""), aws.String(""))
root.Id = fuseops.RootInodeID
root.ToDir()
root.Attributes.Mtime = fs.rootAttrs.Mtime
fs.inodes[fuseops.RootInodeID] = root
fs.nextHandleID = 1
fs.dirHandles = make(map[fuseops.HandleID]*DirHandle)
fs.fileHandles = make(map[fuseops.HandleID]*FileHandle)
fs.replicators = Ticket{Total: 16}.Init()
fs.restorers = Ticket{Total: 8}.Init()
return fs
}
func (fs *Goofys) fallbackV2Signer() (err error) {
if fs.v2Signer {
return fuse.EINVAL
}
s3Log.Infoln("Falling back to v2 signer")
fs.v2Signer = true
fs.s3 = fs.newS3()
return
}
func addAcceptEncoding(req *request.Request) {
if req.HTTPRequest.Method == "GET" {
// we need "Accept-Encoding: identity" so that objects
// with content-encoding won't be automatically
// deflated, but we don't want to sign it because GCS
// doesn't like it
req.HTTPRequest.Header.Set("Accept-Encoding", "identity")
}
}
func (fs *Goofys) newS3() *s3.S3 {
svc := s3.New(fs.sess)
if fs.v2Signer {
svc.Handlers.Sign.Clear()
svc.Handlers.Sign.PushBack(SignV2)
svc.Handlers.Sign.PushBackNamed(corehandlers.BuildContentLengthHandler)
}
svc.Handlers.Sign.PushBack(addAcceptEncoding)
return svc
}
// from https://stackoverflow.com/questions/22892120/how-to-generate-a-random-string-of-a-fixed-length-in-golang
func RandStringBytesMaskImprSrc(n int) string {
const letterBytes = "abcdefghijklmnopqrstuvwxyz0123456789"
const (
letterIdxBits = 6 // 6 bits to represent a letter index
letterIdxMask = 1<<letterIdxBits - 1 // All 1-bits, as many as letterIdxBits
letterIdxMax = 63 / letterIdxBits // # of letter indices fitting in 63 bits
)
src := rand.NewSource(time.Now().UnixNano())
b := make([]byte, n)
// A src.Int63() generates 63 random bits, enough for letterIdxMax characters!
for i, cache, remain := n-1, src.Int63(), letterIdxMax; i >= 0; {
if remain == 0 {
cache, remain = src.Int63(), letterIdxMax
}
if idx := int(cache & letterIdxMask); idx < len(letterBytes) {
b[i] = letterBytes[idx]
i--
}
cache >>= letterIdxBits
remain--
}
return string(b)
}
func (fs *Goofys) testBucket() (err error) {
randomObjectName := fs.key(RandStringBytesMaskImprSrc(32))
_, err = fs.s3.HeadObject(&s3.HeadObjectInput{Bucket: &fs.bucket, Key: randomObjectName})
if err != nil {
err = mapAwsError(err)
if err == fuse.ENOENT {
err = nil
}
}
return
}
func (fs *Goofys) detectBucketLocationByHEAD() (err error, isAws bool) {
u := url.URL{
Scheme: "https",
Host: "s3.amazonaws.com",
Path: fs.bucket,
}
if fs.awsConfig.Endpoint != nil {
endpoint, err := url.Parse(*fs.awsConfig.Endpoint)
if err != nil {
return err, false
}
u.Scheme = endpoint.Scheme
u.Host = endpoint.Host
}
var req *http.Request
var resp *http.Response
req, err = http.NewRequest("HEAD", u.String(), nil)
if err != nil {
return
}
allowFails := 3
for i := 0; i < allowFails; i++ {
resp, err = http.DefaultTransport.RoundTrip(req)
if err != nil {
return
}
if resp.StatusCode < 500 {
break
} else if resp.StatusCode == 503 && resp.Status == "503 Slow Down" {
time.Sleep(time.Duration(i+1) * time.Second)
// allow infinite retries for 503 slow down
allowFails += 1
}
}
region := resp.Header["X-Amz-Bucket-Region"]
server := resp.Header["Server"]
s3Log.Debugf("HEAD %v = %v %v", u.String(), resp.StatusCode, region)
if region == nil {
for k, v := range resp.Header {
s3Log.Debugf("%v = %v", k, v)
}
}
if server != nil && server[0] == "AmazonS3" {
isAws = true
}
switch resp.StatusCode {
case 200:
// note that this only happen if the bucket is in us-east-1
if len(fs.flags.Profile) == 0 {
fs.awsConfig.Credentials = credentials.AnonymousCredentials
s3Log.Infof("anonymous bucket detected")
}
case 400:
err = fuse.EINVAL
case 403:
err = syscall.EACCES
case 404:
err = fuse.ENOENT
case 405:
err = syscall.ENOTSUP
default:
err = awserr.New(strconv.Itoa(resp.StatusCode), resp.Status, nil)
}
if len(region) != 0 {
if region[0] != *fs.awsConfig.Region {
s3Log.Infof("Switching from region '%v' to '%v'",
*fs.awsConfig.Region, region[0])
fs.awsConfig.Region = ®ion[0]
}
// we detected a region, this is aws, the error is irrelevant
err = nil
}
return
}
func (fs *Goofys) cleanUpOldMPU() {
mpu, err := fs.s3.ListMultipartUploads(&s3.ListMultipartUploadsInput{Bucket: &fs.bucket})
if err != nil {
mapAwsError(err)
return
}
s3Log.Debug(mpu)
now := time.Now()
for _, upload := range mpu.Uploads {
expireTime := upload.Initiated.Add(48 * time.Hour)
if !expireTime.After(now) {
params := &s3.AbortMultipartUploadInput{
Bucket: &fs.bucket,
Key: upload.Key,
UploadId: upload.UploadId,
}
resp, err := fs.s3.AbortMultipartUpload(params)
s3Log.Debug(resp)
if mapAwsError(err) == syscall.EACCES {
break
}
} else {
s3Log.Debugf("Keeping MPU Key=%v Id=%v", *upload.Key, *upload.UploadId)
}
}
}
func (fs *Goofys) SigUsr1() {
fs.mu.Lock()
log.Infof("forgot %v inodes", fs.forgotCnt)
log.Infof("%v inodes", len(fs.inodes))
fs.mu.Unlock()
debug.FreeOSMemory()
}
// Find the given inode. Panic if it doesn't exist.
//
// LOCKS_REQUIRED(fs.mu)
func (fs *Goofys) getInodeOrDie(id fuseops.InodeID) (inode *Inode) {
inode = fs.inodes[id]
if inode == nil {
panic(fmt.Sprintf("Unknown inode: %v", id))
}
return
}
func (fs *Goofys) StatFS(
ctx context.Context,
op *fuseops.StatFSOp) (err error) {
const BLOCK_SIZE = 4096
const TOTAL_SPACE = 1 * 1024 * 1024 * 1024 * 1024 * 1024 // 1PB
const TOTAL_BLOCKS = TOTAL_SPACE / BLOCK_SIZE
const INODES = 1 * 1000 * 1000 * 1000 // 1 billion
op.BlockSize = BLOCK_SIZE
op.Blocks = TOTAL_BLOCKS
op.BlocksFree = TOTAL_BLOCKS
op.BlocksAvailable = TOTAL_BLOCKS
op.IoSize = 1 * 1024 * 1024 // 1MB
op.Inodes = INODES
op.InodesFree = INODES
return
}
func (fs *Goofys) GetInodeAttributes(
ctx context.Context,
op *fuseops.GetInodeAttributesOp) (err error) {
fs.mu.Lock()
inode := fs.getInodeOrDie(op.Inode)
fs.mu.Unlock()
attr, err := inode.GetAttributes()
if err == nil {
op.Attributes = *attr
op.AttributesExpiration = time.Now().Add(fs.flags.StatCacheTTL)
}
return
}
func (fs *Goofys) GetXattr(ctx context.Context,
op *fuseops.GetXattrOp) (err error) {
fs.mu.Lock()
inode := fs.getInodeOrDie(op.Inode)
fs.mu.Unlock()
value, err := inode.GetXattr(op.Name)
if err != nil {
return
}
op.BytesRead = len(value)
if len(op.Dst) < op.BytesRead {
return syscall.ERANGE
} else {
copy(op.Dst, value)
return
}
}
func (fs *Goofys) ListXattr(ctx context.Context,
op *fuseops.ListXattrOp) (err error) {
fs.mu.Lock()
inode := fs.getInodeOrDie(op.Inode)
fs.mu.Unlock()
xattrs, err := inode.ListXattr()
ncopied := 0
for _, name := range xattrs {
buf := op.Dst[ncopied:]
nlen := len(name) + 1
if nlen <= len(buf) {
copy(buf, name)
ncopied += nlen
buf[nlen-1] = '\x00'
}
op.BytesRead += nlen
}
if ncopied < op.BytesRead {
err = syscall.ERANGE
}
return
}
func (fs *Goofys) RemoveXattr(ctx context.Context,
op *fuseops.RemoveXattrOp) (err error) {
fs.mu.Lock()
inode := fs.getInodeOrDie(op.Inode)
fs.mu.Unlock()
err = inode.RemoveXattr(op.Name)
return
}
func (fs *Goofys) SetXattr(ctx context.Context,
op *fuseops.SetXattrOp) (err error) {
fs.mu.Lock()
inode := fs.getInodeOrDie(op.Inode)
fs.mu.Unlock()
err = inode.SetXattr(op.Name, op.Value, op.Flags)
return
}
func mapAwsError(err error) error {
if err == nil {
return nil
}
if awsErr, ok := err.(awserr.Error); ok {
if reqErr, ok := err.(awserr.RequestFailure); ok {
// A service error occurred
switch reqErr.StatusCode() {
case 400:
return fuse.EINVAL
case 403:
return syscall.EACCES
case 404:
return fuse.ENOENT
case 405:
return syscall.ENOTSUP
case 500:
return syscall.EAGAIN
default:
s3Log.Errorf("code=%v msg=%v request=%v\n", reqErr.Message(), reqErr.StatusCode(), reqErr.RequestID())
return reqErr
}
} else {
switch awsErr.Code() {
case "BucketRegionError":
// don't need to log anything, we should detect region after
return err
default:
// Generic AWS Error with Code, Message, and original error (if any)
s3Log.Errorf("code=%v msg=%v, err=%v\n", awsErr.Code(), awsErr.Message(), awsErr.OrigErr())
return awsErr
}
}
} else {
return err
}
}
func (fs *Goofys) key(name string) *string {
name = fs.prefix + name
return &name
}
// note that this is NOT the same as url.PathEscape in golang 1.8,
// as this preserves / and url.PathEscape converts / to %2F
func pathEscape(path string) string {
u := url.URL{Path: path}
return u.EscapedPath()
}
func (fs *Goofys) allocateInodeId() (id fuseops.InodeID) {
id = fs.nextInodeID
fs.nextInodeID++
return
}
func expired(cache time.Time, ttl time.Duration) bool {
return !cache.Add(ttl).After(time.Now())
}
func (fs *Goofys) LookUpInode(
ctx context.Context,
op *fuseops.LookUpInodeOp) (err error) {
var inode *Inode
var ok bool
defer func() { fuseLog.Debugf("<-- LookUpInode %v %v %v", op.Parent, op.Name, err) }()
fs.mu.Lock()
parent := fs.getInodeOrDie(op.Parent)
fs.mu.Unlock()
parent.mu.Lock()
fs.mu.Lock()
inode = parent.findChildUnlockedFull(op.Name)
if inode != nil {
ok = true
inode.Ref()
if expired(inode.AttrTime, fs.flags.StatCacheTTL) {
ok = false
if inode.fileHandles != 0 {
// we have an open file handle, object
// in S3 may not represent the true
// state of the file anyway, so just
// return what we know which is
// potentially more accurate
ok = true
} else {
inode.logFuse("lookup expired")
}
}
} else {
ok = false
}
fs.mu.Unlock()
parent.mu.Unlock()
if !ok {
var newInode *Inode
newInode, err = parent.LookUp(op.Name)
if err != nil {
if inode != nil {
// just kidding! pretend we didn't up the ref
fs.mu.Lock()
defer fs.mu.Unlock()
stale := inode.DeRef(1)
if stale {
delete(fs.inodes, inode.Id)
parent.removeChild(inode)
}
}
return err
}
if inode == nil {
parent.mu.Lock()
// check again if it's there, could have been
// added by another lookup or readdir
inode = parent.findChildUnlockedFull(op.Name)
if inode == nil {
fs.mu.Lock()
inode = newInode
fs.insertInode(parent, inode)
fs.mu.Unlock()
}
parent.mu.Unlock()
} else {
if newInode.Attributes.Mtime.IsZero() {
newInode.Attributes.Mtime = inode.Attributes.Mtime
}
inode.Attributes = newInode.Attributes
inode.AttrTime = time.Now()
}
}
op.Entry.Child = inode.Id
op.Entry.Attributes = inode.InflateAttributes()
op.Entry.AttributesExpiration = time.Now().Add(fs.flags.StatCacheTTL)
op.Entry.EntryExpiration = time.Now().Add(fs.flags.TypeCacheTTL)
return
}
// LOCKS_REQUIRED(fs.mu)
// LOCKS_REQUIRED(parent.mu)
func (fs *Goofys) insertInode(parent *Inode, inode *Inode) {
inode.Id = fs.allocateInodeId()
parent.insertChildUnlocked(inode)
fs.inodes[inode.Id] = inode
}
// LOCKS_EXCLUDED(fs.mu)
func (fs *Goofys) ForgetInode(
ctx context.Context,
op *fuseops.ForgetInodeOp) (err error) {
fs.mu.Lock()
inode := fs.getInodeOrDie(op.Inode)
fs.mu.Unlock()
if inode.Parent != nil {
inode.Parent.mu.Lock()
defer inode.Parent.mu.Unlock()
}
fs.mu.Lock()
defer fs.mu.Unlock()
// check again to make sure inode still exists now that we have both the fs and parent lock. inode could have been removed by some other operations?
inode = fs.inodes[op.Inode]
if inode == nil {
return
}
stale := inode.DeRef(op.N)
if stale {
delete(fs.inodes, op.Inode)
fs.forgotCnt += 1
if inode.Parent != nil {
// check again to make sure parent still exists now that we have both the fs and parent lock. Parent could have been removed by some other operations?
parent := fs.inodes[inode.Parent.Id]
if parent != nil {
parent.removeChildUnlocked(inode)
}
}
}
return
}
func (fs *Goofys) OpenDir(
ctx context.Context,
op *fuseops.OpenDirOp) (err error) {
fs.mu.Lock()
handleID := fs.nextHandleID
fs.nextHandleID++
in := fs.getInodeOrDie(op.Inode)
fs.mu.Unlock()
// XXX/is this a dir?
dh := in.OpenDir()
fs.mu.Lock()
defer fs.mu.Unlock()
fs.dirHandles[handleID] = dh
op.Handle = handleID
return
}
// LOCKS_EXCLUDED(fs.mu)
func (fs *Goofys) insertInodeFromDirEntry(parent *Inode, entry *DirHandleEntry) (inode *Inode) {
parent.mu.Lock()
defer parent.mu.Unlock()
if entry.Type == fuseutil.DT_Directory {
// it's possible that both "a" and "a/b" exist, in
// which case we need to turn this file into a
// directory
inode = parent.findChildUnlocked(*entry.Name, false)
if inode != nil {
parent.removeChildUnlocked(inode)
}
}
inode = parent.findChildUnlocked(*entry.Name, entry.Type == fuseutil.DT_Directory)
if inode == nil {
path := parent.getChildName(*entry.Name)
inode = NewInode(fs, parent, entry.Name, &path)
if entry.Type == fuseutil.DT_Directory {
inode.ToDir()
} else {
inode.Attributes = *entry.Attributes
}
if entry.ETag != nil {
inode.s3Metadata["etag"] = []byte(*entry.ETag)
}
if entry.StorageClass != nil {
inode.s3Metadata["storage-class"] = []byte(*entry.StorageClass)
}
// these are fake dir entries, we will realize the refcnt when
// lookup is done
inode.refcnt = 0
fs.mu.Lock()
defer fs.mu.Unlock()
fs.insertInode(parent, inode)
} else {
inode.mu.Lock()
defer inode.mu.Unlock()
if entry.ETag != nil {
inode.s3Metadata["etag"] = []byte(*entry.ETag)
}
if entry.StorageClass != nil {
inode.s3Metadata["storage-class"] = []byte(*entry.StorageClass)
}
inode.KnownSize = &entry.Attributes.Size
inode.Attributes.Mtime = entry.Attributes.Mtime
inode.AttrTime = time.Now()
}
return
}
func makeDirEntry(en *DirHandleEntry) fuseutil.Dirent {
return fuseutil.Dirent{
Name: *en.Name,
Type: en.Type,
Inode: fuseops.RootInodeID + 1,
Offset: en.Offset,
}
}
// LOCKS_EXCLUDED(fs.mu)
func (fs *Goofys) ReadDir(
ctx context.Context,
op *fuseops.ReadDirOp) (err error) {
// Find the handle.
fs.mu.Lock()
dh := fs.dirHandles[op.Handle]
fs.mu.Unlock()
if dh == nil {
panic(fmt.Sprintf("can't find dh=%v", op.Handle))
}
inode := dh.inode
inode.logFuse("ReadDir", op.Offset)
dh.mu.Lock()
defer dh.mu.Unlock()
readFromS3 := false
for i := op.Offset; ; i++ {
e, err := dh.ReadDir(i)
if err != nil {
return err
}
if e == nil {
// we've reached the end, if this was read
// from S3 then update the cache time
if readFromS3 {
inode.dir.DirTime = time.Now()
inode.Attributes.Mtime = inode.findChildMaxTime()
}
break
}
if e.Inode == 0 {
readFromS3 = true
fs.insertInodeFromDirEntry(inode, e)
}
n := fuseutil.WriteDirent(op.Dst[op.BytesRead:], makeDirEntry(e))
if n == 0 {
break
}
dh.inode.logFuse("<-- ReadDir", *e.Name, e.Offset)
op.BytesRead += n
}
return
}
func (fs *Goofys) ReleaseDirHandle(
ctx context.Context,
op *fuseops.ReleaseDirHandleOp) (err error) {
fs.mu.Lock()
defer fs.mu.Unlock()
dh := fs.dirHandles[op.Handle]
dh.CloseDir()
fuseLog.Debugln("ReleaseDirHandle", *dh.inode.FullName())
delete(fs.dirHandles, op.Handle)
return
}
func (fs *Goofys) OpenFile(
ctx context.Context,
op *fuseops.OpenFileOp) (err error) {
fs.mu.Lock()
in := fs.getInodeOrDie(op.Inode)
fs.mu.Unlock()
fh, err := in.OpenFile()
if err != nil {
return
}
fs.mu.Lock()
defer fs.mu.Unlock()
handleID := fs.nextHandleID
fs.nextHandleID++
fs.fileHandles[handleID] = fh
op.Handle = handleID
op.KeepPageCache = true
return
}
func (fs *Goofys) ReadFile(
ctx context.Context,
op *fuseops.ReadFileOp) (err error) {
fs.mu.Lock()
fh := fs.fileHandles[op.Handle]
fs.mu.Unlock()
op.BytesRead, err = fh.ReadFile(op.Offset, op.Dst)
return
}
func (fs *Goofys) SyncFile(
ctx context.Context,
op *fuseops.SyncFileOp) (err error) {
// intentionally ignored, so that write()/sync()/write() works
// see https://github.com/kahing/goofys/issues/154
return
}
func (fs *Goofys) FlushFile(
ctx context.Context,
op *fuseops.FlushFileOp) (err error) {
fs.mu.Lock()
fh := fs.fileHandles[op.Handle]
fs.mu.Unlock()
err = fh.FlushFile()
if err != nil {
// if we returned success from creat() earlier
// linux may think this file exists even when it doesn't,
// until TypeCacheTTL is over
// TODO: figure out a way to make the kernel forget this inode
// see TestWriteAnonymousFuse
fs.mu.Lock()
inode := fs.getInodeOrDie(op.Inode)
fs.mu.Unlock()
if inode.KnownSize == nil {
inode.AttrTime = time.Time{}
}
}
fh.inode.logFuse("<-- FlushFile", err)
return
}
func (fs *Goofys) ReleaseFileHandle(
ctx context.Context,
op *fuseops.ReleaseFileHandleOp) (err error) {
fs.mu.Lock()
defer fs.mu.Unlock()
fh := fs.fileHandles[op.Handle]
fh.Release()
fuseLog.Debugln("ReleaseFileHandle", *fh.inode.FullName())
delete(fs.fileHandles, op.Handle)
// try to compact heap
//fs.bufferPool.MaybeGC()
return
}
func (fs *Goofys) CreateFile(
ctx context.Context,
op *fuseops.CreateFileOp) (err error) {
fs.mu.Lock()
parent := fs.getInodeOrDie(op.Parent)
fs.mu.Unlock()
inode, fh := parent.Create(op.Name)
parent.mu.Lock()
fs.mu.Lock()
defer fs.mu.Unlock()
fs.insertInode(parent, inode)
parent.mu.Unlock()