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package filesys
import (
"context"
"fmt"
"math"
"os"
"sync"
"time"
"github.com/chrislusf/seaweedfs/weed/glog"
"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
"github.com/chrislusf/seaweedfs/weed/util"
"github.com/karlseguin/ccache"
"github.com/seaweedfs/fuse"
"github.com/seaweedfs/fuse/fs"
"google.golang.org/grpc"
)
type Option struct {
FilerGrpcAddress string
GrpcDialOption grpc.DialOption
FilerMountRootPath string
Collection string
Replication string
TtlSec int32
ChunkSizeLimit int64
DataCenter string
DirListingLimit int
EntryCacheTtl time.Duration
Umask os.FileMode
MountUid uint32
MountGid uint32
MountMode os.FileMode
MountCtime time.Time
MountMtime time.Time
}
var _ = fs.FS(&WFS{})
var _ = fs.FSStatfser(&WFS{})
type WFS struct {
option *Option
listDirectoryEntriesCache *ccache.Cache
// contains all open handles
handles []*FileHandle
pathToHandleIndex map[string]int
pathToHandleLock sync.Mutex
bufPool sync.Pool
stats statsCache
}
type statsCache struct {
filer_pb.StatisticsResponse
lastChecked int64 // unix time in seconds
}
func NewSeaweedFileSystem(option *Option) *WFS {
wfs := &WFS{
option: option,
listDirectoryEntriesCache: ccache.New(ccache.Configure().MaxSize(1024 * 8).ItemsToPrune(100)),
pathToHandleIndex: make(map[string]int),
bufPool: sync.Pool{
New: func() interface{} {
return make([]byte, option.ChunkSizeLimit)
},
},
}
return wfs
}
func (wfs *WFS) Root() (fs.Node, error) {
return &Dir{Path: wfs.option.FilerMountRootPath, wfs: wfs}, nil
}
func (wfs *WFS) WithFilerClient(ctx context.Context, fn func(filer_pb.SeaweedFilerClient) error) error {
return util.WithCachedGrpcClient(ctx, func(grpcConnection *grpc.ClientConn) error {
client := filer_pb.NewSeaweedFilerClient(grpcConnection)
return fn(client)
}, wfs.option.FilerGrpcAddress, wfs.option.GrpcDialOption)
}
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(2).Infoln(fullpath, "found fileHandle id", index)
return wfs.handles[index]
}
fileHandle = newFileHandle(file, uid, gid)
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(2).Infoln(fullpath, "new fileHandle id", fileHandle.handle)
wfs.pathToHandleIndex[fullpath] = int(fileHandle.handle)
return
}
func (wfs *WFS) ReleaseHandle(fullpath string, handleId fuse.HandleID) {
wfs.pathToHandleLock.Lock()
defer wfs.pathToHandleLock.Unlock()
glog.V(4).Infof("%s releasing handle id %d current handles length %d", fullpath, handleId, len(wfs.handles))
delete(wfs.pathToHandleIndex, fullpath)
if int(handleId) < len(wfs.handles) {
wfs.handles[int(handleId)] = nil
}
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(ctx, 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),
}
glog.V(4).Infof("reading filer stats: %+v", request)
resp, err := client.Statistics(ctx, 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
}
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