seaweedfs/weed/mount/weedfs_link.go

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package mount
import (
"context"
"syscall"
"time"
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"github.com/hanwen/go-fuse/v2/fuse"
"github.com/seaweedfs/seaweedfs/weed/filer"
"github.com/seaweedfs/seaweedfs/weed/glog"
"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
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)
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/*
What is an inode?
If the file is an hardlinked file:
use the hardlink id as inode
Otherwise:
use the file path as inode
When creating a link:
use the original file inode
*/
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/** Create a hard link to a file */
func (wfs *WFS) Link(cancel <-chan struct{}, in *fuse.LinkIn, name string, out *fuse.EntryOut) (code fuse.Status) {
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if wfs.IsOverQuota {
return fuse.Status(syscall.ENOSPC)
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}
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if s := checkName(name); s != fuse.OK {
return s
}
newParentPath, code := wfs.inodeToPath.GetPath(in.NodeId)
if code != fuse.OK {
return
}
oldEntryPath, code := wfs.inodeToPath.GetPath(in.Oldnodeid)
if code != fuse.OK {
return
}
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oldParentPath, _ := oldEntryPath.DirAndName()
oldEntry, status := wfs.maybeLoadEntry(oldEntryPath)
if status != fuse.OK {
return status
}
// update old file to hardlink mode
if len(oldEntry.HardLinkId) == 0 {
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oldEntry.HardLinkId = filer.NewHardLinkId()
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oldEntry.HardLinkCounter = 1
}
oldEntry.HardLinkCounter++
updateOldEntryRequest := &filer_pb.UpdateEntryRequest{
Directory: oldParentPath,
Entry: oldEntry,
Signatures: []int32{wfs.signature},
}
// CreateLink 1.2 : update new file to hardlink mode
oldEntry.Attributes.Mtime = time.Now().Unix()
request := &filer_pb.CreateEntryRequest{
Directory: string(newParentPath),
Entry: &filer_pb.Entry{
Name: name,
IsDirectory: false,
Attributes: oldEntry.Attributes,
Chunks: oldEntry.GetChunks(),
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Extended: oldEntry.Extended,
HardLinkId: oldEntry.HardLinkId,
HardLinkCounter: oldEntry.HardLinkCounter,
},
Signatures: []int32{wfs.signature},
SkipCheckParentDirectory: true,
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}
// apply changes to the filer, and also apply to local metaCache
err := wfs.WithFilerClient(false, func(client filer_pb.SeaweedFilerClient) error {
wfs.mapPbIdFromLocalToFiler(request.Entry)
defer wfs.mapPbIdFromFilerToLocal(request.Entry)
if err := filer_pb.UpdateEntry(client, updateOldEntryRequest); err != nil {
return err
}
wfs.metaCache.UpdateEntry(context.Background(), filer.FromPbEntry(updateOldEntryRequest.Directory, updateOldEntryRequest.Entry))
if err := filer_pb.CreateEntry(client, request); err != nil {
return err
}
wfs.metaCache.InsertEntry(context.Background(), filer.FromPbEntry(request.Directory, request.Entry))
return nil
})
newEntryPath := newParentPath.Child(name)
if err != nil {
glog.V(0).Infof("Link %v -> %s: %v", oldEntryPath, newEntryPath, err)
return fuse.EIO
}
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wfs.inodeToPath.AddPath(oldEntry.Attributes.Inode, newEntryPath)
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wfs.outputPbEntry(out, oldEntry.Attributes.Inode, request.Entry)
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return fuse.OK
}