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fusefrontend: mark symlink-safe FUSE calls 

Document which FUSE calls are already symlink-safe in
the function comment.
This commit is contained in:
Jakob Unterwurzacher 2018-10-01 21:39:19 +02:00
parent c09bf1f228
commit 0e2e7c13cf
3 changed files with 32 additions and 20 deletions
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40
internal/fusefrontend/fs.go
View File

@ -120,7 +120,9 @@ func (fs *FS) mangleOpenFlags(flags uint32) (newFlags int) {
return newFlags
}
// Open implements pathfs.Filesystem.
// Open - FUSE call. Open already-existing file.
//
// Symlink-safe through Openat().
func (fs *FS) Open(path string, flags uint32, context *fuse.Context) (fuseFile nodefs.File, status fuse.Status) {
if fs.isFiltered(path) {
return nil, fuse.EPERM
@ -201,7 +203,9 @@ func (fs *FS) openWriteOnlyFile(dirfd int, cName string, newFlags int) (fuseFile
return NewFile(f, fs)
}
// Create implements pathfs.Filesystem.
// Create - FUSE call. Creates a new file.
//
// Symlink-safe through the use of Openat().
func (fs *FS) Create(path string, flags uint32, mode uint32, context *fuse.Context) (nodefs.File, fuse.Status) {
if fs.isFiltered(path) {
return nil, fuse.EPERM
@ -245,7 +249,9 @@ func (fs *FS) Create(path string, flags uint32, mode uint32, context *fuse.Conte
return NewFile(f, fs)
}
// Chmod implements pathfs.Filesystem.
// Chmod - FUSE call. Change permissons on "path".
//
// Symlink-safe through use of Fchmodat().
func (fs *FS) Chmod(path string, mode uint32, context *fuse.Context) (code fuse.Status) {
if fs.isFiltered(path) {
return fuse.EPERM
@ -261,7 +267,9 @@ func (fs *FS) Chmod(path string, mode uint32, context *fuse.Context) (code fuse.
return fuse.ToStatus(err)
}
// Chown implements pathfs.Filesystem.
// Chown - FUSE call. Change the owner of "path".
//
// Symlink-safe through use of Fchownat().
func (fs *FS) Chown(path string, uid uint32, gid uint32, context *fuse.Context) (code fuse.Status) {
if fs.isFiltered(path) {
return fuse.EPERM
@ -286,7 +294,9 @@ func (fs *FS) Chown(path string, uid uint32, gid uint32, context *fuse.Context)
return fuse.OK
}
// Mknod implements pathfs.Filesystem.
// Mknod - FUSE call. Create a device file.
//
// Symlink-safe through use of Mknodat().
func (fs *FS) Mknod(path string, mode uint32, dev uint32, context *fuse.Context) (code fuse.Status) {
if fs.isFiltered(path) {
return fuse.EPERM
@ -339,7 +349,7 @@ func (fs *FS) Truncate(path string, offset uint64, context *fuse.Context) (code
return code
}
// Utimens implements pathfs.Filesystem.
// Utimens - FUSE call. Set the timestamps on file "path".
func (fs *FS) Utimens(path string, a *time.Time, m *time.Time, context *fuse.Context) (code fuse.Status) {
if fs.isFiltered(path) {
return fuse.EPERM
@ -351,16 +361,11 @@ func (fs *FS) Utimens(path string, a *time.Time, m *time.Time, context *fuse.Con
return fs.FileSystem.Utimens(cPath, a, m, context)
}
// StatFs implements pathfs.Filesystem.
// StatFs - FUSE call. Returns information about the filesystem.
//
// Symlink-safe because the passed path is ignored.
func (fs *FS) StatFs(path string) *fuse.StatfsOut {
if fs.isFiltered(path) {
return nil
}
cPath, err := fs.encryptPath(path)
if err != nil {
return nil
}
return fs.FileSystem.StatFs(cPath)
return fs.FileSystem.StatFs("")
}
// decryptSymlinkTarget: "cData64" is base64-decoded and decrypted
@ -548,7 +553,10 @@ func (fs *FS) Rename(oldPath string, newPath string, context *fuse.Context) (cod
return fuse.OK
}
// Link implements pathfs.Filesystem.
// Link - FUSE call. Creates a hard link at "newPath" pointing to file
// "oldPath".
//
// Symlink-safe through use of Linkat().
func (fs *FS) Link(oldPath string, newPath string, context *fuse.Context) (code fuse.Status) {
if fs.isFiltered(newPath) {
return fuse.EPERM

4
internal/fusefrontend/fs_dir.go
View File

@ -49,7 +49,9 @@ func (fs *FS) mkdirWithIv(dirfd int, cName string, mode uint32) error {
return err
}
// Mkdir implements pathfs.FileSystem
// Mkdir - FUSE call. Create a directory at "newPath" with permissions "mode".
//
// Symlink-safe through use of Mkdirat().
func (fs *FS) Mkdir(newPath string, mode uint32, context *fuse.Context) (code fuse.Status) {
if fs.isFiltered(newPath) {
return fuse.EPERM

8
internal/fusefrontend/xattr.go
View File

@ -23,8 +23,8 @@ var xattrNameIV = []byte("xattr_name_iv_xx")
// encrypted original name.
var xattrStorePrefix = "user.gocryptfs."
// GetXAttr reads the value of extended attribute "attr".
// Implements pathfs.Filesystem.
// GetXAttr - FUSE call. Reads the value of extended attribute "attr".
// TODO: Make symlink-safe. Blocker: package xattr does not provide fgetxattr(2).
func (fs *FS) GetXAttr(path string, attr string, context *fuse.Context) ([]byte, fuse.Status) {
if fs.isFiltered(path) {
return nil, fuse.EPERM
@ -85,7 +85,9 @@ func (fs *FS) RemoveXAttr(path string, attr string, context *fuse.Context) fuse.
return unpackXattrErr(xattr.LRemove(cPath, cAttr))
}
// ListXAttr implements pathfs.Filesystem.
// ListXAttr - FUSE call. Lists extended attributes on the file at "path".
// TODO: Make symlink-safe. Blocker: package xattr does not provide
// flistxattr(2).
func (fs *FS) ListXAttr(path string, context *fuse.Context) ([]string, fuse.Status) {
if fs.isFiltered(path) {
return nil, fuse.EPERM