linux-ext4 - Re: [PATCH v6 14/21] fanotify: Reserve UAPI bits for FAN_FS

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Date:   Fri, 13 Aug 2021 11:29:29 +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,
        Jan Kara <jack@...e.cz>
Subject: Re: [PATCH v6 14/21] fanotify: Reserve UAPI bits for FAN_FS_ERROR

On Fri, Aug 13, 2021 at 12:41 AM Gabriel Krisman Bertazi
<krisman@...labora.com> wrote:
>
> FAN_FS_ERROR allows reporting of event type FS_ERROR to userspace, which
> a mechanism to report file system wide problems via fanotify.  This
> commit preallocate userspace visible bits to match the FS_ERROR event.
>
> Reviewed-by: Jan Kara <jack@...e.cz>
> Signed-off-by: Gabriel Krisman Bertazi <krisman@...labora.com>

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

> ---
>  fs/notify/fanotify/fanotify.c | 1 +
>  include/uapi/linux/fanotify.h | 1 +
>  2 files changed, 2 insertions(+)
>
> diff --git a/fs/notify/fanotify/fanotify.c b/fs/notify/fanotify/fanotify.c
> index 2b1ab031fbe5..ebb6c557cea1 100644
> --- a/fs/notify/fanotify/fanotify.c
> +++ b/fs/notify/fanotify/fanotify.c
> @@ -760,6 +760,7 @@ static int fanotify_handle_event(struct fsnotify_group *group, u32 mask,
>         BUILD_BUG_ON(FAN_ONDIR != FS_ISDIR);
>         BUILD_BUG_ON(FAN_OPEN_EXEC != FS_OPEN_EXEC);
>         BUILD_BUG_ON(FAN_OPEN_EXEC_PERM != FS_OPEN_EXEC_PERM);
> +       BUILD_BUG_ON(FAN_FS_ERROR != FS_ERROR);
>
>         BUILD_BUG_ON(HWEIGHT32(ALL_FANOTIFY_EVENT_BITS) != 19);
>
> diff --git a/include/uapi/linux/fanotify.h b/include/uapi/linux/fanotify.h
> index fbf9c5c7dd59..16402037fc7a 100644
> --- a/include/uapi/linux/fanotify.h
> +++ b/include/uapi/linux/fanotify.h
> @@ -20,6 +20,7 @@
>  #define FAN_OPEN_EXEC          0x00001000      /* File was opened for exec */
>
>  #define FAN_Q_OVERFLOW         0x00004000      /* Event queued overflowed */
> +#define FAN_FS_ERROR           0x00008000      /* Filesystem error */
>
>  #define FAN_OPEN_PERM          0x00010000      /* File open in perm check */
>  #define FAN_ACCESS_PERM                0x00020000      /* File accessed in perm check */
> --
> 2.32.0
>