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117 lines
3.0 KiB
117 lines
3.0 KiB
package mount
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import (
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"context"
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"syscall"
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"time"
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"github.com/hanwen/go-fuse/v2/fuse"
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"github.com/seaweedfs/seaweedfs/weed/filer"
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"github.com/seaweedfs/seaweedfs/weed/glog"
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"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
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)
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/*
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What is an inode?
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If the file is an hardlinked file:
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use the hardlink id as inode
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Otherwise:
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use the file path as inode
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When creating a link:
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use the original file inode
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*/
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/** Create a hard link to a file */
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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 {
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return fuse.Status(syscall.ENOSPC)
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}
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if s := checkName(name); s != fuse.OK {
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return s
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}
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newParentPath, code := wfs.inodeToPath.GetPath(in.NodeId)
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if code != fuse.OK {
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return
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}
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oldEntryPath, code := wfs.inodeToPath.GetPath(in.Oldnodeid)
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if code != fuse.OK {
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return
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}
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oldParentPath, _ := oldEntryPath.DirAndName()
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oldEntry, status := wfs.maybeLoadEntry(oldEntryPath)
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if status != fuse.OK {
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return status
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}
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// hardlink is not allowed in WORM mode
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if wormEnforced, _ := wfs.wormEnforcedForEntry(oldEntryPath, oldEntry); wormEnforced {
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return fuse.EPERM
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}
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// update old file to hardlink mode
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if len(oldEntry.HardLinkId) == 0 {
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oldEntry.HardLinkId = filer.NewHardLinkId()
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oldEntry.HardLinkCounter = 1
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}
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oldEntry.HardLinkCounter++
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updateOldEntryRequest := &filer_pb.UpdateEntryRequest{
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Directory: oldParentPath,
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Entry: oldEntry,
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Signatures: []int32{wfs.signature},
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}
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// CreateLink 1.2 : update new file to hardlink mode
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oldEntry.Attributes.Mtime = time.Now().Unix()
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request := &filer_pb.CreateEntryRequest{
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Directory: string(newParentPath),
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Entry: &filer_pb.Entry{
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Name: name,
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IsDirectory: false,
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Attributes: oldEntry.Attributes,
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Chunks: oldEntry.GetChunks(),
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Extended: oldEntry.Extended,
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HardLinkId: oldEntry.HardLinkId,
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HardLinkCounter: oldEntry.HardLinkCounter,
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},
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Signatures: []int32{wfs.signature},
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SkipCheckParentDirectory: true,
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}
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// apply changes to the filer, and also apply to local metaCache
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err := wfs.WithFilerClient(false, func(client filer_pb.SeaweedFilerClient) error {
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wfs.mapPbIdFromLocalToFiler(request.Entry)
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defer wfs.mapPbIdFromFilerToLocal(request.Entry)
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if err := filer_pb.UpdateEntry(context.Background(), client, updateOldEntryRequest); err != nil {
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return err
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}
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wfs.metaCache.UpdateEntry(context.Background(), filer.FromPbEntry(updateOldEntryRequest.Directory, updateOldEntryRequest.Entry))
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if err := filer_pb.CreateEntry(context.Background(), client, request); err != nil {
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return err
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}
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wfs.metaCache.InsertEntry(context.Background(), filer.FromPbEntry(request.Directory, request.Entry))
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return nil
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})
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newEntryPath := newParentPath.Child(name)
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if err != nil {
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glog.V(0).Infof("Link %v -> %s: %v", oldEntryPath, newEntryPath, err)
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return fuse.EIO
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}
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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
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}
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