Xattrs support in reverse mode

Fixes https://github.com/rfjakob/gocryptfs/issues/827

1 files changed, 40 insertions, 0 deletions

diff --git a/internal/fusefrontend_reverse/node_xattr_linux.go b/internal/fusefrontend_reverse/node_xattr_linux.go
new file mode 100644
index 0000000..f6d04a5
--- /dev/null
+++ b/internal/fusefrontend_reverse/node_xattr_linux.go
@@ -0,0 +1,40 @@
+package fusefrontend_reverse
+
+import (
+	"fmt"
+	"syscall"
+
+	"github.com/hanwen/go-fuse/v2/fs"
+
+	"github.com/rfjakob/gocryptfs/v2/internal/syscallcompat"
+)
+
+func (n *Node) getXAttr(cAttr string) (out []byte, errno syscall.Errno) {
+	d, errno := n.prepareAtSyscall("")
+	if errno != 0 {
+		return
+	}
+	defer syscall.Close(d.dirfd)
+
+	procPath := fmt.Sprintf("/proc/self/fd/%d/%s", d.dirfd, d.pName)
+	pData, err := syscallcompat.Lgetxattr(procPath, cAttr)
+	if err != nil {
+		return nil, fs.ToErrno(err)
+	}
+	return pData, 0
+}
+
+func (n *Node) listXAttr() (out []string, errno syscall.Errno) {
+	d, errno := n.prepareAtSyscall("")
+	if errno != 0 {
+		return
+	}
+	defer syscall.Close(d.dirfd)
+
+	procPath := fmt.Sprintf("/proc/self/fd/%d/%s", d.dirfd, d.pName)
+	pNames, err := syscallcompat.Llistxattr(procPath)
+	if err != nil {
+		return nil, fs.ToErrno(err)
+	}
+	return pNames, 0
+}