seaweedfs/weed/filesys/wfs.go
2018-07-22 01:15:11 -07:00

110 lines
2.7 KiB
Go

package filesys
import (
"bazil.org/fuse"
"bazil.org/fuse/fs"
"fmt"
"github.com/chrislusf/seaweedfs/weed/glog"
"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
"github.com/chrislusf/seaweedfs/weed/util"
"github.com/karlseguin/ccache"
"sync"
)
type Option struct {
FilerGrpcAddress string
FilerMountRootPath string
Collection string
Replication string
TtlSec int32
ChunkSizeLimit int64
DataCenter string
DirListingLimit int
}
type WFS struct {
option *Option
listDirectoryEntriesCache *ccache.Cache
// contains all open handles
handles []*FileHandle
pathToHandleIndex map[string]int
pathToHandleLock sync.Mutex
}
func NewSeaweedFileSystem(option *Option) *WFS {
return &WFS{
option: option,
listDirectoryEntriesCache: ccache.New(ccache.Configure().MaxSize(6000).ItemsToPrune(100)),
pathToHandleIndex: make(map[string]int),
}
}
func (wfs *WFS) Root() (fs.Node, error) {
return &Dir{Path: wfs.option.FilerMountRootPath, wfs: wfs}, nil
}
func (wfs *WFS) withFilerClient(fn func(filer_pb.SeaweedFilerClient) error) error {
grpcConnection, err := util.GrpcDial(wfs.option.FilerGrpcAddress)
if err != nil {
return fmt.Errorf("fail to dial %s: %v", wfs.option.FilerGrpcAddress, err)
}
defer grpcConnection.Close()
client := filer_pb.NewSeaweedFilerClient(grpcConnection)
return fn(client)
}
func (wfs *WFS) AcquireHandle(file *File, uid, gid uint32) (fileHandle *FileHandle) {
wfs.pathToHandleLock.Lock()
defer wfs.pathToHandleLock.Unlock()
fullpath := file.fullpath()
index, found := wfs.pathToHandleIndex[fullpath]
if found && wfs.handles[index] != nil {
glog.V(4).Infoln(fullpath, "found fileHandle id", index)
return wfs.handles[index]
}
fileHandle = newFileHandle(file, uid, gid)
if found && wfs.handles[index] != nil {
glog.V(4).Infoln(fullpath, "reuse previous fileHandle id", index)
wfs.handles[index] = fileHandle
fileHandle.handle = uint64(index)
return
}
for i, h := range wfs.handles {
if h == nil {
wfs.handles[i] = fileHandle
fileHandle.handle = uint64(i)
wfs.pathToHandleIndex[fullpath] = i
glog.V(4).Infoln(fullpath, "reuse fileHandle id", fileHandle.handle)
return
}
}
wfs.handles = append(wfs.handles, fileHandle)
fileHandle.handle = uint64(len(wfs.handles) - 1)
glog.V(4).Infoln(fullpath, "new fileHandle id", fileHandle.handle)
wfs.pathToHandleIndex[fullpath] = int(fileHandle.handle)
return
}
func (wfs *WFS) ReleaseHandle(handleId fuse.HandleID) {
wfs.pathToHandleLock.Lock()
defer wfs.pathToHandleLock.Unlock()
glog.V(4).Infoln("releasing handle id", handleId, "current handles lengh", len(wfs.handles))
if int(handleId) < len(wfs.handles) {
wfs.handles[int(handleId)] = nil
}
return
}