[Qemu-devel] [PATCH RFC 07/36] 9pfs: local: split mkdir operation per security model

[Greg Kurz]

Having all security models implemented in one monolithic function is
cumbersome. Especially when the need arises to fix something in the
shared code, as it forces to change all the paths at the same time.

This doesn't fix any bug, it is just preparatory cleanup.

Signed-off-by: Greg Kurz <gr...@kaod.org>
---
 hw/9pfs/9p-local.c |   44 +++++++++++++++++++++++++++++++++++---------
 1 file changed, 35 insertions(+), 9 deletions(-)

diff --git a/hw/9pfs/9p-local.c b/hw/9pfs/9p-local.c
index f9abd4229b17..d424d8994779 100644
--- a/hw/9pfs/9p-local.c
+++ b/hw/9pfs/9p-local.c
@@ -1187,26 +1187,52 @@ static int local_rename(FsContext *ctx, const char 
*oldpath,
     return err;
 }
 
-static int local_chown(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp)
+static int local_chown_passthrough(FsContext *fs_ctx, V9fsPath *fs_path,
+                                   FsCred *credp)
 {
     char *buffer;
     int ret = -1;
     char *path = fs_path->data;
 
+    buffer = rpath(fs_ctx, path);
+    ret = lchown(buffer, credp->fc_uid, credp->fc_gid);
+    g_free(buffer);
+    return ret;
+}
+
+static int local_chown_mapped(FsContext *fs_ctx, V9fsPath *fs_path,
+                              FsCred *credp)
+{
+    char *buffer;
+    int ret = -1;
+    char *path = fs_path->data;
+
+    buffer = rpath(fs_ctx, path);
+    ret = local_set_xattr(buffer, credp);
+    g_free(buffer);
+    return ret;
+}
+
+static int local_chown_mapped_file(FsContext *fs_ctx, V9fsPath *fs_path,
+                                   FsCred *credp)
+{
+    char *path = fs_path->data;
+
+    return local_set_mapped_file_attr(fs_ctx, path, credp);
+}
+
+static int local_chown(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp)
+{
     if ((credp->fc_uid == -1 && credp->fc_gid == -1) ||
         (fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
         (fs_ctx->export_flags & V9FS_SM_NONE)) {
-        buffer = rpath(fs_ctx, path);
-        ret = lchown(buffer, credp->fc_uid, credp->fc_gid);
-        g_free(buffer);
+        return local_chown_passthrough(fs_ctx, fs_path, credp);
     } else if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
-        buffer = rpath(fs_ctx, path);
-        ret = local_set_xattr(buffer, credp);
-        g_free(buffer);
+        return local_chown_mapped(fs_ctx, fs_path, credp);
     } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
-        return local_set_mapped_file_attr(fs_ctx, path, credp);
+        return local_chown_mapped_file(fs_ctx, fs_path, credp);
     }
-    return ret;
+    g_assert_not_reached();
 }
 
 static int local_utimensat(FsContext *s, V9fsPath *fs_path,