Fix returning d_ino and d_type by readdir(3) in non-plus mode

When not using the readdir_plus mode, the d_type was not returned,
and the use_ino flag was not used for returning d_ino.

This patch fixes the returned values for d_ino and d_type by readdir(3)

The test for the returned value of d_ino has been adjusted to also
take the d_type into consideration and to check the returned values in
both basic readdir and readdir_plus modes. This is done by executing
the passthrough test twice.

Co-authored-by: Jean-Pierre André <jpandre@users.sourceforge.net>

ChangeLog.rst

@@ -1,3 +1,5 @@
+* Fix returning d_ino and d_type from readdir(3) in non-plus mode
+
 libfuse 3.10.2 (2021-02-05)
 ===========================
 

example/passthrough.c

@@ -55,6 +55,8 @@
 
 #include "passthrough_helpers.h"
 
+static int fill_dir_plus = 0;
+
 static void *xmp_init(struct fuse_conn_info *conn,
 		      struct fuse_config *cfg)
 {
@@ -132,7 +134,7 @@ static int xmp_readdir(const char *path, void *buf, fuse_fill_dir_t filler,
 		memset(&st, 0, sizeof(st));
 		st.st_ino = de->d_ino;
 		st.st_mode = de->d_type << 12;
-		if (filler(buf, de->d_name, &st, 0, FUSE_FILL_DIR_PLUS))
+		if (filler(buf, de->d_name, &st, 0, fill_dir_plus))
 			break;
 	}
 
@@ -551,6 +553,18 @@ static const struct fuse_operations xmp_oper = {
 
 int main(int argc, char *argv[])
 {
+	enum { MAX_ARGS = 10 };
+	int i,new_argc;
+	char *new_argv[MAX_ARGS];
+
 	umask(0);
-	return fuse_main(argc, argv, &xmp_oper, NULL);
+			/* Process the "--plus" option apart */
+	for (i=0, new_argc=0; (i<argc) && (new_argc<MAX_ARGS); i++) {
+		if (!strcmp(argv[i], "--plus")) {
+			fill_dir_plus = FUSE_FILL_DIR_PLUS;
+		} else {
+			new_argv[new_argc++] = argv[i];
+		}
+	}
+	return fuse_main(new_argc, new_argv, &xmp_oper, NULL);
 }

lib/fuse.c

@@ -3578,6 +3578,11 @@ static int fill_dir_plus(void *dh_, const char *name, const struct stat *statp,
 		}
 	} else {
 		e.attr.st_ino = FUSE_UNKNOWN_INO;
+		if (statp) {
+			e.attr.st_mode = statp->st_mode;
+			if (f->conf.use_ino)
+				e.attr.st_ino = statp->st_ino;
+		}
 		if (!f->conf.use_ino && f->conf.readdir_ino) {
 			e.attr.st_ino = (ino_t)
 				lookup_nodeid(f, dh->nodeid, name);

test/readdir_inode.c

@@ -1,7 +1,8 @@
 /*
- * Prints each directory entry and its inode as returned by 'readdir'.
+ * Prints each directory entry, its inode and d_type as returned by 'readdir'.
  * Skips '.' and '..' because readdir is not required to return them and
- * some of our examples don't.
+ * some of our examples don't. However if they are returned, their d_type
+ * should be valid.
  */
 
 #include <stdio.h>
@@ -30,7 +31,18 @@ int main(int argc, char* argv[])
     dent = readdir(dirp);
     while (dent != NULL) {
         if (strcmp(dent->d_name, ".") != 0 && strcmp(dent->d_name, "..") != 0) {
-            printf("%llu %s\n", (unsigned long long)dent->d_ino, dent->d_name);
+            printf("%llu %d %s\n", (unsigned long long)dent->d_ino,
+			(int)dent->d_type, dent->d_name);
+            if ((long long)dent->d_ino < 0)
+               fprintf(stderr,"%s : bad d_ino %llu\n",
+                        dent->d_name, (unsigned long long)dent->d_ino);
+            if ((dent->d_type < 1) || (dent->d_type > 15))
+               fprintf(stderr,"%s : bad d_type %d\n",
+                        dent->d_name, (int)dent->d_type);
+        } else {
+            if (dent->d_type != DT_DIR)
+               fprintf(stderr,"%s : bad d_type %d\n",
+                        dent->d_name, (int)dent->d_type);
         }
         dent = readdir(dirp);
     }

test/test_examples.py

@@ -109,7 +109,8 @@ def test_hello(tmpdir, name, options, cmdline_builder, output_checker):
         umount(mount_process, mnt_dir)
 
 @pytest.mark.parametrize("writeback", (False, True))
-@pytest.mark.parametrize("name", ('passthrough', 'passthrough_fh', 'passthrough_ll'))
+@pytest.mark.parametrize("name", ('passthrough', 'passthrough_plus',
+                           'passthrough_fh', 'passthrough_ll'))
 @pytest.mark.parametrize("debug", (False, True))
 def test_passthrough(short_tmpdir, name, debug, output_checker, writeback):
     # Avoid false positives from libfuse debug messages
@@ -124,9 +125,14 @@ def test_passthrough(short_tmpdir, name, debug, output_checker, writeback):
     mnt_dir = str(short_tmpdir.mkdir('mnt'))
     src_dir = str(short_tmpdir.mkdir('src'))
 
-    cmdline = base_cmdline + \
-              [ pjoin(basename, 'example', name),
-                '-f', mnt_dir ]
+    if name == 'passthrough_plus':
+        cmdline = base_cmdline + \
+                  [ pjoin(basename, 'example', 'passthrough'),
+                    '--plus', '-f', mnt_dir ]
+    else:
+        cmdline = base_cmdline + \
+                  [ pjoin(basename, 'example', name),
+                    '-f', mnt_dir ]
     if debug:
         cmdline.append('-d')