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https://github.com/seaweedfs/seaweedfs.git
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71b33faef0
A POSIX filesystem does not implicitly create parent directories when they do not exist. Directories must be explicitly created and permissions be set. This also fixes a bug where asynchronous operations would create a file in the filer before the parent directory was created. If the file was a symlink or another special type of file the directory would inherit that type and become unusable in the mounted FS.
114 lines
2.8 KiB
Go
114 lines
2.8 KiB
Go
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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// 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(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(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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