diff options
Diffstat (limited to 'internal/fusefrontend_reverse/node.go')
| -rw-r--r-- | internal/fusefrontend_reverse/node.go | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/internal/fusefrontend_reverse/node.go b/internal/fusefrontend_reverse/node.go index 170410f..22ad975 100644 --- a/internal/fusefrontend_reverse/node.go +++ b/internal/fusefrontend_reverse/node.go @@ -68,6 +68,25 @@ func (n *Node) Lookup(ctx context.Context, cName string, out *fuse.EntryOut) (ch if t == typeReal { n.translateSize(d.dirfd, cName, d.pName, &out.Attr) } + + // Usually we always create a new Node ID by always incrementing the generation + // number. + // + // If we already have a child node that matches what we found on disk* + // (as reflected in `ch`), return it here. + // + // This keeps the Node ID for each directory entry stable + // (until forgotten), preventing extra FORGETs from the kernel. + // + // *We compare `cName`, `Ino`, `Mode` (but not `Gen`!) + old := n.Inode.GetChild(cName) + if old != nil && + old.StableAttr().Ino == ch.StableAttr().Ino && + // `Mode` has already been masked with syscall.S_IFMT by n.newChild() + old.StableAttr().Mode == ch.StableAttr().Mode { + return old, 0 + } + return ch, 0 } |