[LTP] [PATCH v4 8/9] syscalls/fanotify22: Test file event with broken inode

[Gabriel Krisman Bertazi]

This test corrupts an inode entry with an invalid mode through debugfs
and then tries to access it.  This should result in a ext4 error, which
we monitor through the fanotify group.

In order for this test to succeed, it requires a kernel fix introduced
by kernel commit 124e7c61deb2 ("ext4: fix error code saved on super
block during file system abort"), which is added to .tags.

Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com>
---
 .../kernel/syscalls/fanotify/fanotify22.c     | 26 +++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/testcases/kernel/syscalls/fanotify/fanotify22.c b/testcases/kernel/syscalls/fanotify/fanotify22.c
index 5d8b4eec74bd..9cd8c8f919b0 100644
--- a/testcases/kernel/syscalls/fanotify/fanotify22.c
+++ b/testcases/kernel/syscalls/fanotify/fanotify22.c
@@ -34,6 +34,10 @@
 #ifdef HAVE_SYS_FANOTIFY_H
 #include "fanotify.h"
 
+#ifndef EFSCORRUPTED
+#define EFSCORRUPTED    EUCLEAN         /* Filesystem is corrupted */
+#endif
+
 #define BUF_SIZE 256
 static char event_buf[BUF_SIZE];
 int fd_notify;
@@ -59,6 +63,17 @@ static void do_debugfs_request(const char *dev, char *request)
 	SAFE_CMD(cmd, NULL, NULL);
 }
 
+static void tcase2_trigger_lookup(void)
+{
+	int ret;
+
+	/* SAFE_OPEN cannot be used here because we expect it to fail. */
+	ret = open(MOUNT_PATH"/"BAD_DIR, O_RDONLY, 0);
+	if (ret != -1 && errno != EUCLEAN)
+		tst_res(TFAIL, "Unexpected lookup result(%d) of %s (%d!=%d)",
+			ret, BAD_DIR, errno, EUCLEAN);
+}
+
 static struct test_case {
 	char *name;
 	int error;
@@ -73,6 +88,13 @@ static struct test_case {
 		.error = ESHUTDOWN,
 		.fid = &null_fid,
 	},
+	{
+		.name = "Lookup of inode with invalid mode",
+		.trigger_error = &tcase2_trigger_lookup,
+		.error_count = 1,
+		.error = EFSCORRUPTED,
+		.fid = &bad_file_fid,
+	},
 };
 
 int check_error_event_info_fid(struct fanotify_event_info_fid *fid,
@@ -251,6 +273,10 @@ static struct tst_test test = {
 	.mntpoint = MOUNT_PATH,
 	.needs_root = 1,
 	.dev_fs_type = "ext4",
+	.tags = (const struct tst_tag[]) {
+		{"linux-git", "124e7c61deb2"},
+		{}
+	},
 	.needs_cmds = (const char *[]) {
 		"debugfs",
 		NULL
-- 
2.33.0