hardcoresushi/libgocryptfs
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v2api: implement Link

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This commit is contained in:
Jakob Unterwurzacher 2020-07-11 19:32:38 +02:00
parent b971c75e67
commit c35b575d5f
2 changed files with 51 additions and 1 deletions
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50
internal/fusefrontend/node.go
View File

@ -350,3 +350,53 @@ func (n *Node) Mknod(ctx context.Context, name string, mode, rdev uint32, out *f
inode = n.newChild(ctx, st, out)
return inode, 0
}
// Link - FUSE call. Creates a hard link at "newPath" pointing to file
// "oldPath".
//
// Symlink-safe through use of Linkat().
func (n *Node) Link(ctx context.Context, target fs.InodeEmbedder, name string, out *fuse.EntryOut) (inode *fs.Inode, errno syscall.Errno) {
dirfd, cName, errno := n.prepareAtSyscall(name)
if errno != 0 {
return
}
defer syscall.Close(dirfd)
n2 := target.(*Node)
dirfd2, cName2, errno := n2.prepareAtSyscall("")
if errno != 0 {
return
}
defer syscall.Close(dirfd2)
// Handle long file name (except in PlaintextNames mode)
rn := n.rootNode()
var err error
if !rn.args.PlaintextNames && nametransform.IsLongContent(cName) {
err = rn.nameTransform.WriteLongNameAt(dirfd, cName, name)
if err != nil {
errno = fs.ToErrno(err)
return
}
// Create "gocryptfs.longfile." link
err = syscallcompat.Linkat(dirfd2, cName2, dirfd, cName, 0)
if err != nil {
nametransform.DeleteLongNameAt(dirfd, cName)
}
} else {
// Create regular link
err = syscallcompat.Linkat(dirfd2, cName2, dirfd, cName, 0)
}
if err != nil {
errno = fs.ToErrno(err)
return
}
st, err := syscallcompat.Fstatat2(dirfd, cName, unix.AT_SYMLINK_NOFOLLOW)
if err != nil {
errno = fs.ToErrno(err)
return
}
inode = n.newChild(ctx, st, out)
return inode, 0
}

2
internal/fusefrontend/node_api_check.go
View File

@ -18,6 +18,7 @@ var _ = (fs.NodeOpendirer)((*Node)(nil))
var _ = (fs.NodeSetattrer)((*Node)(nil))
var _ = (fs.NodeStatfser)((*Node)(nil))
var _ = (fs.NodeMknoder)((*Node)(nil))
var _ = (fs.NodeLinker)((*Node)(nil))
/* TODO
var _ = (fs.NodeGetxattrer)((*Node)(nil))
@ -25,7 +26,6 @@ var _ = (fs.NodeSetxattrer)((*Node)(nil))
var _ = (fs.NodeRemovexattrer)((*Node)(nil))
var _ = (fs.NodeListxattrer)((*Node)(nil))
var _ = (fs.NodeCopyFileRanger)((*Node)(nil))
var _ = (fs.NodeLinker)((*Node)(nil))
var _ = (fs.NodeSymlinker)((*Node)(nil))
var _ = (fs.NodeRenamer)((*Node)(nil))
*/