seaweedfs/weed/mount/weedfs_dir_lookup.go
zemul 0122e022ea
Mount concurrent read (#4400)
* fix:mount deadlock

* feat: concurrent read

* fix

* Remove useless code

* fix

---------

Co-authored-by: zemul <zhouzemiao@ihuman.com>
2023-04-13 22:32:45 -07:00

74 lines
2 KiB
Go

package mount
import (
"context"
"github.com/hanwen/go-fuse/v2/fuse"
"github.com/seaweedfs/seaweedfs/weed/filer"
"github.com/seaweedfs/seaweedfs/weed/glog"
"github.com/seaweedfs/seaweedfs/weed/mount/meta_cache"
"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
)
// Lookup is called by the kernel when the VFS wants to know
// about a file inside a directory. Many lookup calls can
// occur in parallel, but only one call happens for each (dir,
// name) pair.
func (wfs *WFS) Lookup(cancel <-chan struct{}, header *fuse.InHeader, name string, out *fuse.EntryOut) (code fuse.Status) {
if s := checkName(name); s != fuse.OK {
return s
}
dirPath, code := wfs.inodeToPath.GetPath(header.NodeId)
if code != fuse.OK {
return
}
fullFilePath := dirPath.Child(name)
visitErr := meta_cache.EnsureVisited(wfs.metaCache, wfs, dirPath)
if visitErr != nil {
glog.Errorf("dir Lookup %s: %v", dirPath, visitErr)
return fuse.EIO
}
localEntry, cacheErr := wfs.metaCache.FindEntry(context.Background(), fullFilePath)
if cacheErr == filer_pb.ErrNotFound {
return fuse.ENOENT
}
if localEntry == nil {
// glog.V(3).Infof("dir Lookup cache miss %s", fullFilePath)
entry, err := filer_pb.GetEntry(wfs, fullFilePath)
if err != nil {
glog.V(1).Infof("dir GetEntry %s: %v", fullFilePath, err)
return fuse.ENOENT
}
localEntry = filer.FromPbEntry(string(dirPath), entry)
} else {
glog.V(4).Infof("dir Lookup cache hit %s", fullFilePath)
}
if localEntry == nil {
return fuse.ENOENT
}
inode := wfs.inodeToPath.Lookup(fullFilePath, localEntry.Crtime.Unix(), localEntry.IsDirectory(), len(localEntry.HardLinkId) > 0, localEntry.Inode, true)
if fh, found := wfs.fhmap.FindFileHandle(inode); found {
fh.entryLock.RLock()
if entry := fh.GetEntry(); entry != nil {
glog.V(4).Infof("lookup opened file %s size %d", dirPath.Child(localEntry.Name()), filer.FileSize(entry))
localEntry = filer.FromPbEntry(string(dirPath), entry)
}
fh.entryLock.RUnlock()
}
wfs.outputFilerEntry(out, inode, localEntry)
return fuse.OK
}