mirror of
https://github.com/seaweedfs/seaweedfs.git
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272 lines
7 KiB
Go
272 lines
7 KiB
Go
package filesys
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import (
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"context"
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"fmt"
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"math"
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"os"
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"strings"
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"sync"
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"time"
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"github.com/karlseguin/ccache"
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"google.golang.org/grpc"
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"github.com/chrislusf/seaweedfs/weed/glog"
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"github.com/chrislusf/seaweedfs/weed/pb"
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"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
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"github.com/chrislusf/seaweedfs/weed/util"
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"github.com/seaweedfs/fuse"
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"github.com/seaweedfs/fuse/fs"
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)
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type Option struct {
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FilerGrpcAddress string
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GrpcDialOption grpc.DialOption
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FilerMountRootPath string
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Collection string
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Replication string
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TtlSec int32
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ChunkSizeLimit int64
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DataCenter string
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DirListCacheLimit int64
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EntryCacheTtl time.Duration
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Umask os.FileMode
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MountUid uint32
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MountGid uint32
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MountMode os.FileMode
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MountCtime time.Time
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MountMtime time.Time
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OutsideContainerClusterMode bool // whether the mount runs outside SeaweedFS containers
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Cipher bool // whether encrypt data on volume server
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}
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var _ = fs.FS(&WFS{})
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var _ = fs.FSStatfser(&WFS{})
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type WFS struct {
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option *Option
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listDirectoryEntriesCache *ccache.Cache
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// contains all open handles, protected by handlesLock
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handlesLock sync.Mutex
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handles []*FileHandle
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pathToHandleIndex map[util.FullPath]int
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bufPool sync.Pool
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stats statsCache
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// nodes, protected by nodesLock
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nodesLock sync.Mutex
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nodes map[uint64]fs.Node
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root fs.Node
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}
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type statsCache struct {
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filer_pb.StatisticsResponse
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lastChecked int64 // unix time in seconds
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}
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func NewSeaweedFileSystem(option *Option) *WFS {
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wfs := &WFS{
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option: option,
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listDirectoryEntriesCache: ccache.New(ccache.Configure().MaxSize(option.DirListCacheLimit * 3).ItemsToPrune(100)),
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pathToHandleIndex: make(map[util.FullPath]int),
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bufPool: sync.Pool{
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New: func() interface{} {
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return make([]byte, option.ChunkSizeLimit)
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},
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},
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nodes: make(map[uint64]fs.Node),
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}
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wfs.root = &Dir{Path: wfs.option.FilerMountRootPath, wfs: wfs}
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wfs.getNode(util.FullPath(wfs.option.FilerMountRootPath), func() fs.Node {
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return wfs.root
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})
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return wfs
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}
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func (wfs *WFS) Root() (fs.Node, error) {
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return wfs.root, nil
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}
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func (wfs *WFS) WithFilerClient(fn func(filer_pb.SeaweedFilerClient) error) error {
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err := pb.WithCachedGrpcClient(func(grpcConnection *grpc.ClientConn) error {
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client := filer_pb.NewSeaweedFilerClient(grpcConnection)
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return fn(client)
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}, wfs.option.FilerGrpcAddress, wfs.option.GrpcDialOption)
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if err == nil {
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return nil
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}
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return err
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}
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func (wfs *WFS) AcquireHandle(file *File, uid, gid uint32) (fileHandle *FileHandle) {
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fullpath := file.fullpath()
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glog.V(4).Infof("%s AcquireHandle uid=%d gid=%d", fullpath, uid, gid)
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wfs.handlesLock.Lock()
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defer wfs.handlesLock.Unlock()
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index, found := wfs.pathToHandleIndex[fullpath]
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if found && wfs.handles[index] != nil {
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glog.V(2).Infoln(fullpath, "found fileHandle id", index)
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return wfs.handles[index]
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}
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fileHandle = newFileHandle(file, uid, gid)
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for i, h := range wfs.handles {
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if h == nil {
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wfs.handles[i] = fileHandle
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fileHandle.handle = uint64(i)
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wfs.pathToHandleIndex[fullpath] = i
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glog.V(4).Infof("%s reuse fh %d", fullpath, fileHandle.handle)
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return
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}
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}
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wfs.handles = append(wfs.handles, fileHandle)
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fileHandle.handle = uint64(len(wfs.handles) - 1)
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wfs.pathToHandleIndex[fullpath] = int(fileHandle.handle)
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glog.V(4).Infof("%s new fh %d", fullpath, fileHandle.handle)
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return
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}
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func (wfs *WFS) ReleaseHandle(fullpath util.FullPath, handleId fuse.HandleID) {
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wfs.handlesLock.Lock()
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defer wfs.handlesLock.Unlock()
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glog.V(4).Infof("%s ReleaseHandle id %d current handles length %d", fullpath, handleId, len(wfs.handles))
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delete(wfs.pathToHandleIndex, fullpath)
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if int(handleId) < len(wfs.handles) {
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wfs.handles[int(handleId)] = nil
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}
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return
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}
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// Statfs is called to obtain file system metadata. Implements fuse.FSStatfser
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func (wfs *WFS) Statfs(ctx context.Context, req *fuse.StatfsRequest, resp *fuse.StatfsResponse) error {
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glog.V(4).Infof("reading fs stats: %+v", req)
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if wfs.stats.lastChecked < time.Now().Unix()-20 {
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err := wfs.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
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request := &filer_pb.StatisticsRequest{
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Collection: wfs.option.Collection,
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Replication: wfs.option.Replication,
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Ttl: fmt.Sprintf("%ds", wfs.option.TtlSec),
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}
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glog.V(4).Infof("reading filer stats: %+v", request)
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resp, err := client.Statistics(context.Background(), request)
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if err != nil {
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glog.V(0).Infof("reading filer stats %v: %v", request, err)
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return err
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}
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glog.V(4).Infof("read filer stats: %+v", resp)
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wfs.stats.TotalSize = resp.TotalSize
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wfs.stats.UsedSize = resp.UsedSize
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wfs.stats.FileCount = resp.FileCount
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wfs.stats.lastChecked = time.Now().Unix()
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return nil
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})
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if err != nil {
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glog.V(0).Infof("filer Statistics: %v", err)
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return err
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}
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}
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totalDiskSize := wfs.stats.TotalSize
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usedDiskSize := wfs.stats.UsedSize
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actualFileCount := wfs.stats.FileCount
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// Compute the total number of available blocks
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resp.Blocks = totalDiskSize / blockSize
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// Compute the number of used blocks
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numBlocks := uint64(usedDiskSize / blockSize)
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// Report the number of free and available blocks for the block size
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resp.Bfree = resp.Blocks - numBlocks
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resp.Bavail = resp.Blocks - numBlocks
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resp.Bsize = uint32(blockSize)
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// Report the total number of possible files in the file system (and those free)
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resp.Files = math.MaxInt64
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resp.Ffree = math.MaxInt64 - actualFileCount
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// Report the maximum length of a name and the minimum fragment size
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resp.Namelen = 1024
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resp.Frsize = uint32(blockSize)
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return nil
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}
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func (wfs *WFS) cacheGet(path util.FullPath) *filer_pb.Entry {
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item := wfs.listDirectoryEntriesCache.Get(string(path))
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if item != nil && !item.Expired() {
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return item.Value().(*filer_pb.Entry)
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}
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return nil
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}
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func (wfs *WFS) cacheSet(path util.FullPath, entry *filer_pb.Entry, ttl time.Duration) {
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if entry == nil {
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wfs.listDirectoryEntriesCache.Delete(string(path))
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} else {
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wfs.listDirectoryEntriesCache.Set(string(path), entry, ttl)
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}
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}
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func (wfs *WFS) cacheDelete(path util.FullPath) {
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wfs.listDirectoryEntriesCache.Delete(string(path))
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}
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func (wfs *WFS) getNode(fullpath util.FullPath, fn func() fs.Node) fs.Node {
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wfs.nodesLock.Lock()
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defer wfs.nodesLock.Unlock()
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node, found := wfs.nodes[fullpath.AsInode()]
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if found {
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return node
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}
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node = fn()
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if node != nil {
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wfs.nodes[fullpath.AsInode()] = node
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}
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return node
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}
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func (wfs *WFS) forgetNode(fullpath util.FullPath) {
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wfs.nodesLock.Lock()
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defer wfs.nodesLock.Unlock()
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delete(wfs.nodes, fullpath.AsInode())
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}
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func (wfs *WFS) AdjustedUrl(hostAndPort string) string {
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if !wfs.option.OutsideContainerClusterMode {
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return hostAndPort
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}
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commaIndex := strings.Index(hostAndPort, ":")
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if commaIndex < 0 {
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return hostAndPort
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}
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filerCommaIndex := strings.Index(wfs.option.FilerGrpcAddress, ":")
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return fmt.Sprintf("%s:%s", wfs.option.FilerGrpcAddress[:filerCommaIndex], hostAndPort[commaIndex+1:])
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}
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