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package fusefrontend
import (
"context"
"syscall"
"github.com/hanwen/go-fuse/v2/fs"
"github.com/hanwen/go-fuse/v2/fuse"
"golang.org/x/sys/unix"
"github.com/rfjakob/gocryptfs/v2/internal/inomap"
"github.com/rfjakob/gocryptfs/v2/internal/syscallcompat"
)
var _ = (fs.NodeStatxer)((*Node)(nil))
var _ = (fs.FileStatxer)((*File)(nil))
// Statx is the Linux statx equivalent of Getattr.
func (n *Node) Statx(ctx context.Context, f fs.FileHandle, flags uint32, mask uint32, out *fuse.StatxOut) (errno syscall.Errno) {
// If the kernel gives us a file handle, use it. Current Linux kernels do
// not send one with FUSE_STATX, but keep this for future compatibility.
if f != nil {
if fsx, ok := f.(fs.FileStatxer); ok {
return fsx.Statx(ctx, flags, mask, out)
}
}
dirfd, cName, errno := n.prepareAtSyscallMyself()
if errno != 0 {
return errno
}
defer syscall.Close(dirfd)
var st unix.Statx_t
err := syscallcompat.Statx(dirfd, cName, int(flags)|unix.AT_SYMLINK_NOFOLLOW, int(mask), &st)
if err != nil {
return fs.ToErrno(err)
}
// fix inode number, size, owner
rn := n.rootNode()
st.Ino = rn.inoMap.Translate(inomap.NewQIno(unix.Mkdev(st.Dev_major, st.Dev_minor), 0, st.Ino))
st.Size = rn.translateSize(dirfd, cName, uint32(st.Mode), st.Size)
if rn.args.ForceOwner != nil {
st.Uid = rn.args.ForceOwner.Uid
st.Gid = rn.args.ForceOwner.Gid
}
out.FromStatx(&st)
return 0
}
// Statx returns statx information for an open backing file. Current Linux
// kernels do not send a file handle with FUSE_STATX, so this is not reached yet.
func (f *File) Statx(_ context.Context, flags uint32, mask uint32, out *fuse.StatxOut) syscall.Errno {
f.fdLock.RLock()
defer f.fdLock.RUnlock()
var st unix.Statx_t
err := syscallcompat.Statx(f.intFd(), "", int(flags)|unix.AT_EMPTY_PATH, int(mask), &st)
if err != nil {
return fs.ToErrno(err)
}
// fix inode number, size, owner
rn := f.rootNode
st.Ino = rn.inoMap.Translate(inomap.NewQIno(unix.Mkdev(st.Dev_major, st.Dev_minor), 0, st.Ino))
if uint32(st.Mode)&syscall.S_IFMT == syscall.S_IFREG {
st.Size = rn.contentEnc.CipherSizeToPlainSize(st.Size)
}
if rn.args.ForceOwner != nil {
st.Uid = rn.args.ForceOwner.Uid
st.Gid = rn.args.ForceOwner.Gid
}
out.FromStatx(&st)
return 0
}
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