linux-ext4 - Re: [PATCH 6/7] syscalls/fanotify20: Test file event with broken inode

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Date:   Tue, 3 Aug 2021 12:04:13 +0300
From:   Amir Goldstein <amir73il@...il.com>
To:     Gabriel Krisman Bertazi <krisman@...labora.com>
Cc:     LTP List <ltp@...ts.linux.it>, Jan Kara <jack@...e.com>,
        Ext4 <linux-ext4@...r.kernel.org>,
        Khazhismel Kumykov <khazhy@...gle.com>, kernel@...labora.com
Subject: Re: [PATCH 6/7] syscalls/fanotify20: Test file event with broken inode

On Tue, Aug 3, 2021 at 12:47 AM Gabriel Krisman Bertazi
<krisman@...labora.com> wrote:
>
> 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.
>
> Signed-off-by: Gabriel Krisman Bertazi <krisman@...labora.com>
> ---
>  .../kernel/syscalls/fanotify/fanotify20.c     | 38 +++++++++++++++++++
>  1 file changed, 38 insertions(+)
>
> diff --git a/testcases/kernel/syscalls/fanotify/fanotify20.c b/testcases/kernel/syscalls/fanotify/fanotify20.c
> index e7ced28eb61d..0c63e90edc3a 100644
> --- a/testcases/kernel/syscalls/fanotify/fanotify20.c
> +++ b/testcases/kernel/syscalls/fanotify/fanotify20.c
> @@ -76,6 +76,36 @@ static void trigger_fs_abort(void)
>                    MS_REMOUNT|MS_RDONLY, "abort");
>  }
>
> +#define TCASE2_BASEDIR "tcase2"
> +#define TCASE2_BAD_DIR TCASE2_BASEDIR"/bad_dir"
> +
> +static unsigned int tcase2_bad_ino;
> +static void tcase2_prepare_fs(void)
> +{
> +       struct stat stat;
> +
> +       SAFE_MKDIR(MOUNT_PATH"/"TCASE2_BASEDIR, 0777);
> +       SAFE_MKDIR(MOUNT_PATH"/"TCASE2_BAD_DIR, 0777);
> +
> +       SAFE_STAT(MOUNT_PATH"/"TCASE2_BAD_DIR, &stat);
> +       tcase2_bad_ino = stat.st_ino;

Better use fanotify_save_fid(MOUNT_PATH"/"TCASE2_BAD_DIR, &tcase2_bad_fid)

Thanks,
Amir.