9p: Properly check/translate flags in unlinkat

The 9p-local code previously relied on P9_DOTL_AT_REMOVEDIR and AT_REMOVEDIR
having the same numerical value and deferred any errorchecking to the
syscall itself. However, while the former assumption is true on Linux,
it is not true in general. 9p-handle did this properly however. Move
the translation code to the generic 9p server code and add an error
if unrecognized flags are passed.

Signed-off-by: Keno Fischer <keno@juliacomputing.com>
Signed-off-by: Greg Kurz <groug@kaod.org>

1 files changed, 1 insertions, 7 deletions

diff --git a/hw/9pfs/9p-handle.c b/hw/9pfs/9p-handle.c
index 4dc0d2bed1..f3641dbe4a 100644
--- a/hw/9pfs/9p-handle.c
+++ b/hw/9pfs/9p-handle.c
@@ -559,19 +559,13 @@ static int handle_unlinkat(FsContext *ctx, V9fsPath *dir,
 {
     int dirfd, ret;
     HandleData *data = (HandleData *) ctx->private;
-    int rflags;
 
     dirfd = open_by_handle(data->mountfd, dir->data, O_PATH);
     if (dirfd < 0) {
         return dirfd;
     }
 
-    rflags = 0;
-    if (flags & P9_DOTL_AT_REMOVEDIR) {
-        rflags |= AT_REMOVEDIR;
-    }
-
-    ret = unlinkat(dirfd, name, rflags);
+    ret = unlinkat(dirfd, name, flags);
 
     close(dirfd);
     return ret;