seaweedfs/weed/filesys/wfs.go

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package filesys
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import (
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"context"
"fmt"
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"math"
"os"
"path"
"sync"
"time"
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"google.golang.org/grpc"
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"github.com/chrislusf/seaweedfs/weed/util/grace"
"github.com/seaweedfs/fuse"
"github.com/seaweedfs/fuse/fs"
"github.com/chrislusf/seaweedfs/weed/filesys/meta_cache"
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"github.com/chrislusf/seaweedfs/weed/glog"
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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/chrislusf/seaweedfs/weed/util/chunk_cache"
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)
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type Option struct {
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FilerGrpcAddress string
GrpcDialOption grpc.DialOption
FilerMountRootPath string
Collection string
Replication string
TtlSec int32
ChunkSizeLimit int64
CacheDir string
CacheSizeMB int64
DataCenter string
EntryCacheTtl time.Duration
Umask os.FileMode
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MountUid uint32
MountGid uint32
MountMode os.FileMode
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MountCtime time.Time
MountMtime time.Time
OutsideContainerClusterMode bool // whether the mount runs outside SeaweedFS containers
Cipher bool // whether encrypt data on volume server
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}
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var _ = fs.FS(&WFS{})
var _ = fs.FSStatfser(&WFS{})
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type WFS struct {
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option *Option
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// contains all open handles, protected by handlesLock
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handlesLock sync.Mutex
handles map[uint64]*FileHandle
bufPool sync.Pool
stats statsCache
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root fs.Node
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chunkCache *chunk_cache.ChunkCache
metaCache *meta_cache.MetaCache
}
type statsCache struct {
filer_pb.StatisticsResponse
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,
handles: make(map[uint64]*FileHandle),
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bufPool: sync.Pool{
New: func() interface{} {
return make([]byte, option.ChunkSizeLimit)
},
},
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}
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cacheUniqueId := util.Md5([]byte(option.FilerGrpcAddress + option.FilerMountRootPath + util.Version()))[0:4]
cacheDir := path.Join(option.CacheDir, cacheUniqueId)
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if option.CacheSizeMB > 0 {
os.MkdirAll(cacheDir, 0755)
wfs.chunkCache = chunk_cache.NewChunkCache(256, cacheDir, option.CacheSizeMB)
grace.OnInterrupt(func() {
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wfs.chunkCache.Shutdown()
})
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}
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wfs.metaCache = meta_cache.NewMetaCache(path.Join(cacheDir, "meta"))
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startTime := time.Now()
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go meta_cache.SubscribeMetaEvents(wfs.metaCache, wfs, wfs.option.FilerMountRootPath, startTime.UnixNano())
grace.OnInterrupt(func() {
wfs.metaCache.Shutdown()
})
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wfs.root = &Dir{name: wfs.option.FilerMountRootPath, wfs: wfs}
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return wfs
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}
func (wfs *WFS) Root() (fs.Node, error) {
return wfs.root, nil
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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()
glog.V(4).Infof("%s AcquireHandle uid=%d gid=%d", fullpath, uid, gid)
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wfs.handlesLock.Lock()
defer wfs.handlesLock.Unlock()
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inodeId := file.fullpath().AsInode()
existingHandle, found := wfs.handles[inodeId]
if found && existingHandle != nil {
return existingHandle
}
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fileHandle = newFileHandle(file, uid, gid)
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wfs.handles[inodeId] = fileHandle
fileHandle.handle = inodeId
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glog.V(4).Infof("%s new fh %d", fullpath, fileHandle.handle)
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return
}
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func (wfs *WFS) ReleaseHandle(fullpath util.FullPath, handleId fuse.HandleID) {
wfs.handlesLock.Lock()
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.handles, fullpath.AsInode())
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return
}
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// 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),
}
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
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// Compute the total number of available blocks
resp.Blocks = totalDiskSize / blockSize
// 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
resp.Bavail = resp.Blocks - numBlocks
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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
}