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package mount
import (
"context"
"errors"
"math/rand"
"os"
"path"
"path/filepath"
"sync/atomic"
"time"
"github.com/hanwen/go-fuse/v2/fuse"
"google.golang.org/grpc"
"github.com/seaweedfs/seaweedfs/weed/filer"
"github.com/seaweedfs/seaweedfs/weed/mount/meta_cache"
"github.com/seaweedfs/seaweedfs/weed/pb"
"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
"github.com/seaweedfs/seaweedfs/weed/pb/mount_pb"
"github.com/seaweedfs/seaweedfs/weed/storage/types"
"github.com/seaweedfs/seaweedfs/weed/util"
"github.com/seaweedfs/seaweedfs/weed/util/chunk_cache"
"github.com/seaweedfs/seaweedfs/weed/util/grace"
"github.com/seaweedfs/seaweedfs/weed/wdclient"
"github.com/hanwen/go-fuse/v2/fs"
)
type Option struct {
filerIndex int32 // align memory for atomic read/write
FilerAddresses []pb.ServerAddress
MountDirectory string
GrpcDialOption grpc.DialOption
FilerMountRootPath string
Collection string
Replication string
TtlSec int32
DiskType types.DiskType
ChunkSizeLimit int64
ConcurrentWriters int
CacheDirForRead string
CacheSizeMBForRead int64
CacheDirForWrite string
DataCenter string
Umask os.FileMode
Quota int64
DisableXAttr bool
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
uniqueCacheDirForRead string
uniqueCacheDirForWrite string
}
type WFS struct {
// https://dl.acm.org/doi/fullHtml/10.1145/3310148
// follow https://github.com/hanwen/go-fuse/blob/master/fuse/api.go
fuse.RawFileSystem
mount_pb.UnimplementedSeaweedMountServer
fs.Inode
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
IsOverQuota bool
fhLockTable *util.LockTable[FileHandleId]
FilerConf *filer.FilerConf
}
func NewSeaweedFileSystem(option *Option) *WFS {
wfs := &WFS{
RawFileSystem: fuse.NewDefaultRawFileSystem(),
option: option,
signature: util.RandomInt32(),
inodeToPath: NewInodeToPath(util.FullPath(option.FilerMountRootPath)),
fhMap: NewFileHandleToInode(),
dhMap: NewDirectoryHandleToInode(),
fhLockTable: util.NewLockTable[FileHandleId](),
}
wfs.option.filerIndex = int32(rand.Intn(len(option.FilerAddresses)))
wfs.option.setupUniqueCacheDirectory()
if option.CacheSizeMBForRead > 0 {
wfs.chunkCache = chunk_cache.NewTieredChunkCache(256, option.getUniqueCacheDirForRead(), option.CacheSizeMBForRead, 1024*1024)
}
wfs.metaCache = meta_cache.NewMetaCache(path.Join(option.getUniqueCacheDirForRead(), "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) {
// Find inode if it is not a deleted path
if inode, inodeFound := wfs.inodeToPath.GetInode(filePath); inodeFound {
// Find open file handle
if fh, fhFound := wfs.fhMap.FindFileHandle(inode); fhFound {
fhActiveLock := fh.wfs.fhLockTable.AcquireLock("invalidateFunc", fh.fh, util.ExclusiveLock)
defer fh.wfs.fhLockTable.ReleaseLock(fh.fh, fhActiveLock)
// Recreate dirty pages
fh.dirtyPages.Destroy()
fh.dirtyPages = newPageWriter(fh, wfs.option.ChunkSizeLimit)
// Update handle entry
newEntry, status := wfs.maybeLoadEntry(filePath)
if status == fuse.OK {
if fh.GetEntry().GetEntry() != newEntry {
fh.SetEntry(newEntry)
}
}
}
}
})
grace.OnInterrupt(func() {
wfs.metaCache.Shutdown()
os.RemoveAll(option.getUniqueCacheDirForWrite())
os.RemoveAll(option.getUniqueCacheDirForRead())
})
if wfs.option.ConcurrentWriters > 0 {
wfs.concurrentWriters = util.NewLimitedConcurrentExecutor(wfs.option.ConcurrentWriters)
}
return wfs
}
func (wfs *WFS) StartBackgroundTasks() error {
fn, err := wfs.subscribeFilerConfEvents()
if err != nil {
return err
}
go fn()
startTime := time.Now()
go meta_cache.SubscribeMetaEvents(wfs.metaCache, wfs.signature, wfs, wfs.option.FilerMountRootPath, startTime.UnixNano())
go wfs.loopCheckQuota()
return nil
}
func (wfs *WFS) String() string {
return "seaweedfs"
}
func (wfs *WFS) Init(server *fuse.Server) {
wfs.fuseServer = server
}
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
}
var found bool
if fh, found = wfs.fhMap.FindFileHandle(inode); found {
entry = fh.UpdateEntry(func(entry *filer_pb.Entry) {
if entry != nil && fh.entry.Attributes == nil {
entry.Attributes = &filer_pb.FuseAttributes{}
}
})
} else {
entry, status = wfs.maybeLoadEntry(path)
}
return
}
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
meta_cache.EnsureVisited(wfs.metaCache, wfs, util.FullPath(dir))
cachedEntry, cacheErr := wfs.metaCache.FindEntry(context.Background(), fullpath)
if errors.Is(cacheErr, filer_pb.ErrNotFound) {
return nil, fuse.ENOENT
}
return cachedEntry.ToProtoEntry(), fuse.OK
}
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 {
i := atomic.LoadInt32(&wfs.option.filerIndex)
return wfs.option.FilerAddresses[i]
}
func (option *Option) setupUniqueCacheDirectory() {
cacheUniqueId := util.Md5String([]byte(option.MountDirectory + string(option.FilerAddresses[0]) + option.FilerMountRootPath + util.Version()))[0:8]
option.uniqueCacheDirForRead = path.Join(option.CacheDirForRead, cacheUniqueId)
os.MkdirAll(option.uniqueCacheDirForRead, os.FileMode(0777)&^option.Umask)
option.uniqueCacheDirForWrite = filepath.Join(path.Join(option.CacheDirForWrite, cacheUniqueId), "swap")
os.MkdirAll(option.uniqueCacheDirForWrite, os.FileMode(0777)&^option.Umask)
}
func (option *Option) getUniqueCacheDirForWrite() string {
return option.uniqueCacheDirForWrite
}
func (option *Option) getUniqueCacheDirForRead() string {
return option.uniqueCacheDirForRead
}
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