linux-ext4 - Re: [PATCH v6 04/21] fsnotify: Reserve mark flag bits for backends

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Date:   Fri, 13 Aug 2021 10:28:27 +0300
From:   Amir Goldstein <amir73il@...il.com>
To:     Gabriel Krisman Bertazi <krisman@...labora.com>
Cc:     Jan Kara <jack@...e.com>, Linux API <linux-api@...r.kernel.org>,
        Ext4 <linux-ext4@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Khazhismel Kumykov <khazhy@...gle.com>,
        David Howells <dhowells@...hat.com>,
        Dave Chinner <david@...morbit.com>,
        Theodore Tso <tytso@....edu>,
        "Darrick J. Wong" <djwong@...nel.org>,
        Matthew Bobrowski <repnop@...gle.com>, kernel@...labora.com
Subject: Re: [PATCH v6 04/21] fsnotify: Reserve mark flag bits for backends

On Fri, Aug 13, 2021 at 12:40 AM Gabriel Krisman Bertazi
<krisman@...labora.com> wrote:
>
> Split out the final bits of struct fsnotify_mark->flags for use by a
> backend.
>
> Signed-off-by: Gabriel Krisman Bertazi <krisman@...labora.com>
>
> Changes since v1:
>   - turn consts into defines (jan)
> ---
>  include/linux/fsnotify_backend.h | 18 +++++++++++++++---
>  1 file changed, 15 insertions(+), 3 deletions(-)
>
> diff --git a/include/linux/fsnotify_backend.h b/include/linux/fsnotify_backend.h
> index 1ce66748a2d2..ae1bd9f06808 100644
> --- a/include/linux/fsnotify_backend.h
> +++ b/include/linux/fsnotify_backend.h
> @@ -363,6 +363,20 @@ struct fsnotify_mark_connector {
>         struct hlist_head list;
>  };
>
> +enum fsnotify_mark_bits {
> +       FSN_MARK_FL_BIT_IGNORED_SURV_MODIFY,
> +       FSN_MARK_FL_BIT_ALIVE,
> +       FSN_MARK_FL_BIT_ATTACHED,
> +       FSN_MARK_PRIVATE_FLAGS,
> +};
> +
> +#define FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY \
> +       (1 << FSN_MARK_FL_BIT_IGNORED_SURV_MODIFY)
> +#define FSNOTIFY_MARK_FLAG_ALIVE \
> +       (1 << FSN_MARK_FL_BIT_ALIVE)
> +#define FSNOTIFY_MARK_FLAG_ATTACHED \
> +       (1 << FSN_MARK_FL_BIT_ATTACHED)
> +
>  /*
>   * A mark is simply an object attached to an in core inode which allows an
>   * fsnotify listener to indicate they are either no longer interested in events
> @@ -398,9 +412,7 @@ struct fsnotify_mark {
>         struct fsnotify_mark_connector *connector;
>         /* Events types to ignore [mark->lock, group->mark_mutex] */
>         __u32 ignored_mask;
> -#define FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY 0x01
> -#define FSNOTIFY_MARK_FLAG_ALIVE               0x02
> -#define FSNOTIFY_MARK_FLAG_ATTACHED            0x04
> +       /* Upper bits [31:PRIVATE_FLAGS] are reserved for backend usage */

I don't understand what [31:PRIVATE_FLAGS] means

Otherwise:

Reviewed-by: Amir Goldstein <amir73il@...il.com>

Thanks,
Amir.