Re: [PATCH RFC 12/15] fanotify: Introduce the FAN_ERROR mark

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On Mon, Apr 26, 2021 at 9:43 PM Gabriel Krisman Bertazi
<krisman@xxxxxxxxxxxxx> wrote:
>
> The FAN_ERROR mark is used by filesystem wide monitoring tools to
> receive notifications of type FS_ERROR_EVENT, emited by filesystems when
> a problem is detected.  The error notification includes a generic error
> descriptor, an optional location record and a filesystem specific blob.
>
> Signed-off-by: Gabriel Krisman Bertazi <krisman@xxxxxxxxxxxxx>
> ---
>  fs/notify/fanotify/fanotify.c      | 48 +++++++++++++++++++----
>  fs/notify/fanotify/fanotify.h      |  8 ++++
>  fs/notify/fanotify/fanotify_user.c | 63 ++++++++++++++++++++++++++++++
>  include/linux/fanotify.h           |  9 ++++-
>  include/uapi/linux/fanotify.h      |  2 +
>  5 files changed, 120 insertions(+), 10 deletions(-)
>
> diff --git a/fs/notify/fanotify/fanotify.c b/fs/notify/fanotify/fanotify.c
> index 98591a8155a7..6bae23d42e5e 100644
> --- a/fs/notify/fanotify/fanotify.c
> +++ b/fs/notify/fanotify/fanotify.c
> @@ -240,12 +240,14 @@ static u32 fanotify_group_event_mask(struct fsnotify_group *group,
>                  __func__, iter_info->report_mask, event_mask, data, data_type);
>
>         if (!fid_mode) {
> -               /* Do we have path to open a file descriptor? */
> -               if (!path)
> -                       return 0;
> -               /* Path type events are only relevant for files and dirs */
> -               if (!d_is_reg(path->dentry) && !d_can_lookup(path->dentry))
> -                       return 0;
> +               if (!fanotify_is_error_event(event_mask)) {

This open coded nested condition is not nice.
If we get as far as this, I will explain what needs to be done.
Need helpers fanotify_is_reporting_fd(), fanotify_is_reporting_fid() and
fanotify_is_reporting_dir_fid().

Thanks,
Amir.



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