seaweedfs/weed/filesys/wfs.go
2021-09-12 22:47:52 -07:00

304 lines
8.5 KiB
Go

package filesys
import (
"context"
"fmt"
"github.com/chrislusf/seaweedfs/weed/pb"
"math"
"math/rand"
"os"
"path"
"path/filepath"
"sync"
"time"
"github.com/chrislusf/seaweedfs/weed/filer"
"github.com/chrislusf/seaweedfs/weed/storage/types"
"github.com/chrislusf/seaweedfs/weed/wdclient"
"google.golang.org/grpc"
"github.com/chrislusf/seaweedfs/weed/util/grace"
"github.com/seaweedfs/fuse"
"github.com/seaweedfs/fuse/fs"
"github.com/chrislusf/seaweedfs/weed/filesys/meta_cache"
"github.com/chrislusf/seaweedfs/weed/glog"
"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
"github.com/chrislusf/seaweedfs/weed/util"
"github.com/chrislusf/seaweedfs/weed/util/chunk_cache"
)
type Option struct {
MountDirectory string
FilerAddresses []pb.ServerAddress
filerIndex int
GrpcDialOption grpc.DialOption
FilerMountRootPath string
Collection string
Replication string
TtlSec int32
DiskType types.DiskType
ChunkSizeLimit int64
ConcurrentWriters int
CacheDir string
CacheSizeMB int64
DataCenter string
Umask os.FileMode
MountUid uint32
MountGid uint32
MountMode os.FileMode
MountCtime time.Time
MountMtime time.Time
MountParentInode uint64
VolumeServerAccess string // how to access volume servers
Cipher bool // whether encrypt data on volume server
UidGidMapper *meta_cache.UidGidMapper
uniqueCacheDir string
uniqueCacheTempPageDir string
}
var _ = fs.FS(&WFS{})
var _ = fs.FSStatfser(&WFS{})
type WFS struct {
option *Option
// contains all open handles, protected by handlesLock
handlesLock sync.Mutex
handles map[uint64]*FileHandle
bufPool sync.Pool
stats statsCache
root fs.Node
fsNodeCache *FsCache
chunkCache *chunk_cache.TieredChunkCache
metaCache *meta_cache.MetaCache
signature int32
// throttle writers
concurrentWriters *util.LimitedConcurrentExecutor
Server *fs.Server
}
type statsCache struct {
filer_pb.StatisticsResponse
lastChecked int64 // unix time in seconds
}
func NewSeaweedFileSystem(option *Option) *WFS {
wfs := &WFS{
option: option,
handles: make(map[uint64]*FileHandle),
bufPool: sync.Pool{
New: func() interface{} {
return make([]byte, option.ChunkSizeLimit)
},
},
signature: util.RandomInt32(),
}
wfs.option.filerIndex = rand.Intn(len(option.FilerAddresses))
wfs.option.setupUniqueCacheDirectory()
if option.CacheSizeMB > 0 {
wfs.chunkCache = chunk_cache.NewTieredChunkCache(256, option.getUniqueCacheDir(), option.CacheSizeMB, 1024*1024)
}
wfs.metaCache = meta_cache.NewMetaCache(path.Join(option.getUniqueCacheDir(), "meta"), util.FullPath(option.FilerMountRootPath), option.UidGidMapper, func(filePath util.FullPath) {
fsNode := NodeWithId(filePath.AsInode())
if err := wfs.Server.InvalidateNodeData(fsNode); err != nil {
glog.V(4).Infof("InvalidateNodeData %s : %v", filePath, err)
}
dir, name := filePath.DirAndName()
parent := NodeWithId(util.FullPath(dir).AsInode())
if dir == option.FilerMountRootPath {
parent = NodeWithId(1)
}
if err := wfs.Server.InvalidateEntry(parent, name); err != nil {
glog.V(4).Infof("InvalidateEntry %s : %v", filePath, err)
}
})
grace.OnInterrupt(func() {
wfs.metaCache.Shutdown()
})
wfs.root = &Dir{name: wfs.option.FilerMountRootPath, wfs: wfs, id: 1}
wfs.fsNodeCache = newFsCache(wfs.root)
if wfs.option.ConcurrentWriters > 0 {
wfs.concurrentWriters = util.NewLimitedConcurrentExecutor(wfs.option.ConcurrentWriters)
}
return wfs
}
func (wfs *WFS) StartBackgroundTasks() {
startTime := time.Now()
go meta_cache.SubscribeMetaEvents(wfs.metaCache, wfs.signature, wfs, wfs.option.FilerMountRootPath, startTime.UnixNano())
}
func (wfs *WFS) Root() (fs.Node, error) {
return wfs.root, nil
}
func (wfs *WFS) AcquireHandle(file *File, uid, gid uint32, writeOnly bool) (fileHandle *FileHandle) {
fullpath := file.fullpath()
glog.V(4).Infof("AcquireHandle %s uid=%d gid=%d", fullpath, uid, gid)
inodeId := file.Id()
wfs.handlesLock.Lock()
existingHandle, found := wfs.handles[inodeId]
if found && existingHandle != nil && existingHandle.f.isOpen > 0 {
existingHandle.f.isOpen++
wfs.handlesLock.Unlock()
existingHandle.dirtyPages.SetWriteOnly(writeOnly)
glog.V(4).Infof("Reuse AcquiredHandle %s open %d", fullpath, existingHandle.f.isOpen)
return existingHandle
}
wfs.handlesLock.Unlock()
entry, _ := file.maybeLoadEntry(context.Background())
file.entry = entry
fileHandle = newFileHandle(file, uid, gid, writeOnly)
wfs.handlesLock.Lock()
file.isOpen++
wfs.handles[inodeId] = fileHandle
wfs.handlesLock.Unlock()
fileHandle.handle = inodeId
glog.V(4).Infof("Acquired new Handle %s open %d", fullpath, file.isOpen)
return
}
func (wfs *WFS) ReleaseHandle(fullpath util.FullPath, handleId fuse.HandleID) {
wfs.handlesLock.Lock()
defer wfs.handlesLock.Unlock()
glog.V(4).Infof("ReleaseHandle %s id %d current handles length %d", fullpath, handleId, len(wfs.handles))
delete(wfs.handles, uint64(handleId))
return
}
// Statfs is called to obtain file system metadata. Implements fuse.FSStatfser
func (wfs *WFS) Statfs(ctx context.Context, req *fuse.StatfsRequest, resp *fuse.StatfsResponse) error {
glog.V(4).Infof("reading fs stats: %+v", req)
if wfs.stats.lastChecked < time.Now().Unix()-20 {
err := wfs.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
request := &filer_pb.StatisticsRequest{
Collection: wfs.option.Collection,
Replication: wfs.option.Replication,
Ttl: fmt.Sprintf("%ds", wfs.option.TtlSec),
DiskType: string(wfs.option.DiskType),
}
glog.V(4).Infof("reading filer stats: %+v", request)
resp, err := client.Statistics(context.Background(), request)
if err != nil {
glog.V(0).Infof("reading filer stats %v: %v", request, err)
return err
}
glog.V(4).Infof("read filer stats: %+v", resp)
wfs.stats.TotalSize = resp.TotalSize
wfs.stats.UsedSize = resp.UsedSize
wfs.stats.FileCount = resp.FileCount
wfs.stats.lastChecked = time.Now().Unix()
return nil
})
if err != nil {
glog.V(0).Infof("filer Statistics: %v", err)
return err
}
}
totalDiskSize := wfs.stats.TotalSize
usedDiskSize := wfs.stats.UsedSize
actualFileCount := wfs.stats.FileCount
// Compute the total number of available blocks
resp.Blocks = totalDiskSize / blockSize
// Compute the number of used blocks
numBlocks := uint64(usedDiskSize / blockSize)
// Report the number of free and available blocks for the block size
resp.Bfree = resp.Blocks - numBlocks
resp.Bavail = resp.Blocks - numBlocks
resp.Bsize = uint32(blockSize)
// Report the total number of possible files in the file system (and those free)
resp.Files = math.MaxInt64
resp.Ffree = math.MaxInt64 - actualFileCount
// Report the maximum length of a name and the minimum fragment size
resp.Namelen = 1024
resp.Frsize = uint32(blockSize)
return nil
}
func (wfs *WFS) mapPbIdFromFilerToLocal(entry *filer_pb.Entry) {
if entry.Attributes == nil {
return
}
entry.Attributes.Uid, entry.Attributes.Gid = wfs.option.UidGidMapper.FilerToLocal(entry.Attributes.Uid, entry.Attributes.Gid)
}
func (wfs *WFS) mapPbIdFromLocalToFiler(entry *filer_pb.Entry) {
if entry.Attributes == nil {
return
}
entry.Attributes.Uid, entry.Attributes.Gid = wfs.option.UidGidMapper.LocalToFiler(entry.Attributes.Uid, entry.Attributes.Gid)
}
func (wfs *WFS) LookupFn() wdclient.LookupFileIdFunctionType {
if wfs.option.VolumeServerAccess == "filerProxy" {
return func(fileId string) (targetUrls []string, err error) {
return []string{"http://" + wfs.getCurrentFiler().ToHttpAddress() + "/?proxyChunkId=" + fileId}, nil
}
}
return filer.LookupFn(wfs)
}
func (wfs *WFS) getCurrentFiler() pb.ServerAddress {
return wfs.option.FilerAddresses[wfs.option.filerIndex]
}
func (option *Option) setupUniqueCacheDirectory() {
cacheUniqueId := util.Md5String([]byte(option.MountDirectory + string(option.FilerAddresses[0]) + option.FilerMountRootPath + util.Version()))[0:8]
option.uniqueCacheDir = path.Join(option.CacheDir, cacheUniqueId)
option.uniqueCacheTempPageDir = filepath.Join(option.uniqueCacheDir, "sw")
os.MkdirAll(option.uniqueCacheTempPageDir, os.FileMode(0777)&^option.Umask)
}
func (option *Option) getTempFilePageDir() string {
return option.uniqueCacheTempPageDir
}
func (option *Option) getUniqueCacheDir() string {
return option.uniqueCacheDir
}
type NodeWithId uint64
func (n NodeWithId) Id() uint64 {
return uint64(n)
}
func (n NodeWithId) Attr(ctx context.Context, attr *fuse.Attr) error {
return nil
}