seaweedfs/weed/mount/weedfs.go

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package mount
import (
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"context"
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"github.com/chrislusf/seaweedfs/weed/filer"
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"github.com/chrislusf/seaweedfs/weed/mount/meta_cache"
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"github.com/chrislusf/seaweedfs/weed/pb"
"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
"github.com/chrislusf/seaweedfs/weed/storage/types"
"github.com/chrislusf/seaweedfs/weed/util"
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"github.com/chrislusf/seaweedfs/weed/util/chunk_cache"
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"github.com/chrislusf/seaweedfs/weed/util/grace"
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"github.com/chrislusf/seaweedfs/weed/wdclient"
"github.com/hanwen/go-fuse/v2/fuse"
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"google.golang.org/grpc"
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"math/rand"
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"os"
"path"
"path/filepath"
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"time"
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"github.com/hanwen/go-fuse/v2/fs"
)
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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
Quota int64
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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
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}
type WFS struct {
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// https://dl.acm.org/doi/fullHtml/10.1145/3310148
// follow https://github.com/hanwen/go-fuse/blob/master/fuse/api.go
fuse.RawFileSystem
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fs.Inode
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option *Option
metaCache *meta_cache.MetaCache
stats statsCache
chunkCache *chunk_cache.TieredChunkCache
signature int32
concurrentWriters *util.LimitedConcurrentExecutor
inodeToPath *InodeToPath
fhmap *FileHandleToInode
dhmap *DirectoryHandleToInode
fuseServer *fuse.Server
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IsOverQuota bool
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}
func NewSeaweedFileSystem(option *Option) *WFS {
wfs := &WFS{
RawFileSystem: fuse.NewDefaultRawFileSystem(),
option: option,
signature: util.RandomInt32(),
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inodeToPath: NewInodeToPath(util.FullPath(option.FilerMountRootPath)),
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fhmap: NewFileHandleToInode(),
dhmap: NewDirectoryHandleToInode(),
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}
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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)
}
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wfs.metaCache = meta_cache.NewMetaCache(path.Join(option.getUniqueCacheDir(), "meta"), option.UidGidMapper,
util.FullPath(option.FilerMountRootPath),
func(path util.FullPath) {
wfs.inodeToPath.MarkChildrenCached(path)
}, func(path util.FullPath) bool {
return wfs.inodeToPath.IsChildrenCached(path)
}, func(filePath util.FullPath, entry *filer_pb.Entry) {
})
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grace.OnInterrupt(func() {
wfs.metaCache.Shutdown()
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os.RemoveAll(option.getUniqueCacheDir())
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})
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if wfs.option.ConcurrentWriters > 0 {
wfs.concurrentWriters = util.NewLimitedConcurrentExecutor(wfs.option.ConcurrentWriters)
}
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return wfs
}
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func (wfs *WFS) StartBackgroundTasks() {
startTime := time.Now()
go meta_cache.SubscribeMetaEvents(wfs.metaCache, wfs.signature, wfs, wfs.option.FilerMountRootPath, startTime.UnixNano())
go wfs.loopCheckQuota()
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}
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func (wfs *WFS) String() string {
return "seaweedfs"
}
func (wfs *WFS) Init(server *fuse.Server) {
wfs.fuseServer = server
}
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func (wfs *WFS) maybeReadEntry(inode uint64) (path util.FullPath, fh *FileHandle, entry *filer_pb.Entry, status fuse.Status) {
path, status = wfs.inodeToPath.GetPath(inode)
if status != fuse.OK {
return
}
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var found bool
if fh, found = wfs.fhmap.FindFileHandle(inode); found {
return path, fh, fh.entry, fuse.OK
}
entry, status = wfs.maybeLoadEntry(path)
return
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}
func (wfs *WFS) maybeLoadEntry(fullpath util.FullPath) (*filer_pb.Entry, fuse.Status) {
// glog.V(3).Infof("read entry cache miss %s", fullpath)
dir, name := fullpath.DirAndName()
// return a valid entry for the mount root
if string(fullpath) == wfs.option.FilerMountRootPath {
return &filer_pb.Entry{
Name: name,
IsDirectory: true,
Attributes: &filer_pb.FuseAttributes{
Mtime: wfs.option.MountMtime.Unix(),
FileMode: uint32(wfs.option.MountMode),
Uid: wfs.option.MountUid,
Gid: wfs.option.MountGid,
Crtime: wfs.option.MountCtime.Unix(),
},
}, fuse.OK
}
// read from async meta cache
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meta_cache.EnsureVisited(wfs.metaCache, wfs, util.FullPath(dir), nil)
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cachedEntry, cacheErr := wfs.metaCache.FindEntry(context.Background(), fullpath)
if cacheErr == filer_pb.ErrNotFound {
return nil, fuse.ENOENT
}
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return cachedEntry.ToProtoEntry(), fuse.OK
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}
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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]
}
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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, "swap")
os.MkdirAll(option.uniqueCacheTempPageDir, os.FileMode(0777)&^option.Umask)
}
func (option *Option) getTempFilePageDir() string {
return option.uniqueCacheTempPageDir
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}
func (option *Option) getUniqueCacheDir() string {
return option.uniqueCacheDir
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}