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package fusefrontend
import (
"context"
"path/filepath"
"syscall"
"golang.org/x/sys/unix"
"github.com/hanwen/go-fuse/v2/fs"
"github.com/hanwen/go-fuse/v2/fuse"
"github.com/rfjakob/gocryptfs/internal/contentenc"
"github.com/rfjakob/gocryptfs/internal/inomap"
"github.com/rfjakob/gocryptfs/internal/nametransform"
"github.com/rfjakob/gocryptfs/internal/syscallcompat"
)
// Node is a file or directory in the filesystem tree
// in a gocryptfs mount.
type Node struct {
fs.Inode
}
// RootNode is the root of the filesystem tree of Nodes.
type RootNode struct {
Node
// args stores configuration arguments
args Args
// Filename encryption helper
nameTransform nametransform.NameTransformer
// Content encryption helper
contentEnc *contentenc.ContentEnc
// MitigatedCorruptions is used to report data corruption that is internally
// mitigated by ignoring the corrupt item. For example, when OpenDir() finds
// a corrupt filename, we still return the other valid filenames.
// The corruption is logged to syslog to inform the user, and in addition,
// the corrupt filename is logged to this channel via
// reportMitigatedCorruption().
// "gocryptfs -fsck" reads from the channel to also catch these transparently-
// mitigated corruptions.
MitigatedCorruptions chan string
// IsIdle flag is set to zero each time fs.isFiltered() is called
// (uint32 so that it can be reset with CompareAndSwapUint32).
// When -idle was used when mounting, idleMonitor() sets it to 1
// periodically.
IsIdle uint32
// inoMap translates inode numbers from different devices to unique inode
// numbers.
inoMap *inomap.InoMap
}
func NewRootNode(args Args, c *contentenc.ContentEnc, n nametransform.NameTransformer) *RootNode {
// TODO
return &RootNode{
args: args,
nameTransform: n,
contentEnc: c,
inoMap: inomap.New(),
}
}
// path returns the relative plaintext path of this node
func (n *Node) path() string {
return n.Path(n.Root())
}
func (n *Node) rootNode() *RootNode {
return n.Root().Operations().(*RootNode)
}
func (n *Node) Lookup(ctx context.Context, name string, out *fuse.EntryOut) (*fs.Inode, syscall.Errno) {
rn := n.rootNode()
p := filepath.Join(n.path(), name)
dirfd, cName, err := rn.openBackingDir(p)
if err != nil {
return nil, fs.ToErrno(err)
}
defer syscall.Close(dirfd)
// Get device number and inode number into `st`
st, err := syscallcompat.Fstatat2(dirfd, cName, unix.AT_SYMLINK_NOFOLLOW)
if err != nil {
return nil, fs.ToErrno(err)
}
// Get unique inode number
rn.inoMap.TranslateStat(st)
out.Attr.FromStat(st)
// Create child node
id := fs.StableAttr{
Mode: uint32(st.Mode),
Gen: 1,
Ino: st.Ino,
}
node := &Node{}
ch := n.NewInode(ctx, node, id)
return ch, 0
}
func (n *Node) Getattr(ctx context.Context, f fs.FileHandle, out *fuse.AttrOut) syscall.Errno {
rn := n.rootNode()
dirfd, cName, err := rn.openBackingDir(n.path())
if err != nil {
return fs.ToErrno(err)
}
defer syscall.Close(dirfd)
st, err := syscallcompat.Fstatat2(dirfd, cName, unix.AT_SYMLINK_NOFOLLOW)
if err != nil {
return fs.ToErrno(err)
}
rn.inoMap.TranslateStat(st)
out.Attr.FromStat(st)
return 0
}
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