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authorJakob Unterwurzacher2020-07-11 19:56:45 +0200
committerJakob Unterwurzacher2020-07-11 19:56:45 +0200
commit7de3330d70971c95562e8fa6db889cac2f17da36 (patch)
treecea084ca98a7577639197155c358f2dfd443dc62 /internal/fusefrontend/node.go
parent84344834c4fb49c2eb484bcc43d24a2522b1b5c1 (diff)
v2api: implement Rename
Diffstat (limited to 'internal/fusefrontend/node.go')
-rw-r--r--internal/fusefrontend/node.go63
1 files changed, 63 insertions, 0 deletions
diff --git a/internal/fusefrontend/node.go b/internal/fusefrontend/node.go
index 5b42ddc..6f85ddb 100644
--- a/internal/fusefrontend/node.go
+++ b/internal/fusefrontend/node.go
@@ -451,3 +451,66 @@ func (n *Node) Symlink(ctx context.Context, target, name string, out *fuse.Entry
inode = n.newChild(ctx, st, out)
return inode, 0
}
+
+// Rename - FUSE call.
+//
+// Symlink-safe through Renameat().
+func (n *Node) Rename(ctx context.Context, name string, newParent fs.InodeEmbedder, newName string, flags uint32) (errno syscall.Errno) {
+ dirfd, cName, errno := n.prepareAtSyscall(name)
+ if errno != 0 {
+ return
+ }
+ defer syscall.Close(dirfd)
+
+ n2 := newParent.(*Node)
+ dirfd2, cName2, errno := n2.prepareAtSyscall("")
+ if errno != 0 {
+ return
+ }
+ defer syscall.Close(dirfd2)
+
+ // Easy case.
+ rn := n.rootNode()
+ if rn.args.PlaintextNames {
+ return fs.ToErrno(unix.Renameat2(dirfd, cName, dirfd2, cName2, uint(flags)))
+ }
+ // Long destination file name: create .name file
+ nameFileAlreadyThere := false
+ var err error
+ if nametransform.IsLongContent(cName2) {
+ err = rn.nameTransform.WriteLongNameAt(dirfd2, cName2, newName)
+ // Failure to write the .name file is expected when the target path already
+ // exists. Since hashes are pretty unique, there is no need to modify the
+ // .name file in this case, and we ignore the error.
+ if err == syscall.EEXIST {
+ nameFileAlreadyThere = true
+ } else if err != nil {
+ return fs.ToErrno(err)
+ }
+ }
+ // Actual rename
+ tlog.Debug.Printf("Renameat %d/%s -> %d/%s\n", dirfd, cName, dirfd2, cName2)
+ err = unix.Renameat2(dirfd, cName, dirfd2, cName2, uint(flags))
+ if err == syscall.ENOTEMPTY || err == syscall.EEXIST {
+ // If an empty directory is overwritten we will always get an error as
+ // the "empty" directory will still contain gocryptfs.diriv.
+ // Interestingly, ext4 returns ENOTEMPTY while xfs returns EEXIST.
+ // We handle that by trying to fs.Rmdir() the target directory and trying
+ // again.
+ tlog.Debug.Printf("Rename: Handling ENOTEMPTY")
+ if n2.Rmdir(ctx, newName) == 0 {
+ err = unix.Renameat2(dirfd, cName, dirfd2, cName2, uint(flags))
+ }
+ }
+ if err != nil {
+ if nametransform.IsLongContent(cName2) && nameFileAlreadyThere == false {
+ // Roll back .name creation unless the .name file was already there
+ nametransform.DeleteLongNameAt(dirfd2, cName2)
+ }
+ return fs.ToErrno(err)
+ }
+ if nametransform.IsLongContent(cName) {
+ nametransform.DeleteLongNameAt(dirfd, cName)
+ }
+ return 0
+}