v2api: implement Setattr

1 files changed, 83 insertions, 0 deletions

diff --git a/internal/fusefrontend/file2_setattr.go b/internal/fusefrontend/file2_setattr.go
new file mode 100644
index 0000000..c341e53
--- /dev/null
+++ b/internal/fusefrontend/file2_setattr.go
@@ -0,0 +1,83 @@
+package fusefrontend
+
+import (
+	"context"
+	"syscall"
+
+	"github.com/hanwen/go-fuse/v2/fs"
+	"github.com/hanwen/go-fuse/v2/fuse"
+
+	"github.com/rfjakob/gocryptfs/internal/syscallcompat"
+)
+
+func (f *File2) Setattr(ctx context.Context, in *fuse.SetAttrIn, out *fuse.AttrOut) (errno syscall.Errno) {
+	errno = f.setAttr(ctx, in)
+	if errno != 0 {
+		return errno
+	}
+	return f.Getattr(ctx, out)
+}
+
+func (f *File2) setAttr(ctx context.Context, in *fuse.SetAttrIn) (errno syscall.Errno) {
+	f.fdLock.RLock()
+	defer f.fdLock.RUnlock()
+	if f.released {
+		return syscall.EBADF
+	}
+	f.fileTableEntry.ContentLock.Lock()
+	defer f.fileTableEntry.ContentLock.Unlock()
+
+	// chmod(2) & fchmod(2)
+	if mode, ok := in.GetMode(); ok {
+		errno = fs.ToErrno(syscall.Fchmod(f.intFd(), mode))
+		if errno != 0 {
+			return errno
+		}
+	}
+
+	// chown(2) & fchown(2)
+	uid32, uOk := in.GetUID()
+	gid32, gOk := in.GetGID()
+	if uOk || gOk {
+		uid := -1
+		gid := -1
+
+		if uOk {
+			uid = int(uid32)
+		}
+		if gOk {
+			gid = int(gid32)
+		}
+		errno = fs.ToErrno(syscall.Fchown(f.intFd(), uid, gid))
+		if errno != 0 {
+			return errno
+		}
+	}
+
+	// utimens(2)
+	mtime, mok := in.GetMTime()
+	atime, aok := in.GetATime()
+	if mok || aok {
+		ap := &atime
+		mp := &mtime
+		if !aok {
+			ap = nil
+		}
+		if !mok {
+			mp = nil
+		}
+		errno = fs.ToErrno(syscallcompat.FutimesNano(f.intFd(), ap, mp))
+		if errno != 0 {
+			return errno
+		}
+	}
+
+	// truncate(2)
+	if sz, ok := in.GetSize(); ok {
+		errno = syscall.Errno(f.truncate(sz))
+		if errno != 0 {
+			return errno
+		}
+	}
+	return 0
+}