linux-ext4 - Re: [PATCH v5 08/23] fsnotify: Add wrapper around fsnotify_add

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Date:   Thu, 5 Aug 2021 11:28:03 +0200
From:   Jan Kara <jack@...e.cz>
To:     Gabriel Krisman Bertazi <krisman@...labora.com>
Cc:     jack@...e.com, amir73il@...il.com, djwong@...nel.org,
        tytso@....edu, david@...morbit.com, dhowells@...hat.com,
        khazhy@...gle.com, linux-fsdevel@...r.kernel.org,
        linux-ext4@...r.kernel.org, linux-api@...r.kernel.org,
        kernel@...labora.com
Subject: Re: [PATCH v5 08/23] fsnotify: Add wrapper around fsnotify_add_event

On Wed 04-08-21 12:05:57, Gabriel Krisman Bertazi wrote:
> fsnotify_add_event is growing in number of parameters, which is most
							      ^^ in most
cases...

> case are just passed a NULL pointer.  So, split out a new
> fsnotify_insert_event function to clean things up for users who don't
> need an insert hook.
> 
> Suggested-by: Amir Goldstein <amir73il@...il.com>
> Reviewed-by: Amir Goldstein <amir73il@...il.com>
> Signed-off-by: Gabriel Krisman Bertazi <krisman@...labora.com>

Otherwise looks good. Feel free to add:

Reviewed-by: Jan Kara <jack@...e.cz>

								Honza

> ---
>  fs/notify/fanotify/fanotify.c        |  4 ++--
>  fs/notify/inotify/inotify_fsnotify.c |  2 +-
>  fs/notify/notification.c             | 12 ++++++------
>  include/linux/fsnotify_backend.h     | 23 ++++++++++++++++-------
>  4 files changed, 25 insertions(+), 16 deletions(-)
> 
> diff --git a/fs/notify/fanotify/fanotify.c b/fs/notify/fanotify/fanotify.c
> index c3eefe3f6494..acf78c0ed219 100644
> --- a/fs/notify/fanotify/fanotify.c
> +++ b/fs/notify/fanotify/fanotify.c
> @@ -781,8 +781,8 @@ static int fanotify_handle_event(struct fsnotify_group *group, u32 mask,
>  	}
>  
>  	fsn_event = &event->fse;
> -	ret = fsnotify_add_event(group, fsn_event, fanotify_merge,
> -				 fanotify_insert_event);
> +	ret = fsnotify_insert_event(group, fsn_event, fanotify_merge,
> +				    fanotify_insert_event);
>  	if (ret) {
>  		/* Permission events shouldn't be merged */
>  		BUG_ON(ret == 1 && mask & FANOTIFY_PERM_EVENTS);
> diff --git a/fs/notify/inotify/inotify_fsnotify.c b/fs/notify/inotify/inotify_fsnotify.c
> index d1a64daa0171..a96582cbfad1 100644
> --- a/fs/notify/inotify/inotify_fsnotify.c
> +++ b/fs/notify/inotify/inotify_fsnotify.c
> @@ -116,7 +116,7 @@ int inotify_handle_inode_event(struct fsnotify_mark *inode_mark, u32 mask,
>  	if (len)
>  		strcpy(event->name, name->name);
>  
> -	ret = fsnotify_add_event(group, fsn_event, inotify_merge, NULL);
> +	ret = fsnotify_add_event(group, fsn_event, inotify_merge);
>  	if (ret) {
>  		/* Our event wasn't used in the end. Free it. */
>  		fsnotify_destroy_event(group, fsn_event);
> diff --git a/fs/notify/notification.c b/fs/notify/notification.c
> index 32f45543b9c6..44bb10f50715 100644
> --- a/fs/notify/notification.c
> +++ b/fs/notify/notification.c
> @@ -78,12 +78,12 @@ void fsnotify_destroy_event(struct fsnotify_group *group,
>   * 2 if the event was not queued - either the queue of events has overflown
>   *   or the group is shutting down.
>   */
> -int fsnotify_add_event(struct fsnotify_group *group,
> -		       struct fsnotify_event *event,
> -		       int (*merge)(struct fsnotify_group *,
> -				    struct fsnotify_event *),
> -		       void (*insert)(struct fsnotify_group *,
> -				      struct fsnotify_event *))
> +int fsnotify_insert_event(struct fsnotify_group *group,
> +			  struct fsnotify_event *event,
> +			  int (*merge)(struct fsnotify_group *,
> +				       struct fsnotify_event *),
> +			  void (*insert)(struct fsnotify_group *,
> +					 struct fsnotify_event *))
>  {
>  	int ret = 0;
>  	struct list_head *list = &group->notification_list;
> diff --git a/include/linux/fsnotify_backend.h b/include/linux/fsnotify_backend.h
> index 2b5fb9327a77..cd4ca11f129e 100644
> --- a/include/linux/fsnotify_backend.h
> +++ b/include/linux/fsnotify_backend.h
> @@ -495,16 +495,25 @@ extern int fsnotify_fasync(int fd, struct file *file, int on);
>  extern void fsnotify_destroy_event(struct fsnotify_group *group,
>  				   struct fsnotify_event *event);
>  /* attach the event to the group notification queue */
> -extern int fsnotify_add_event(struct fsnotify_group *group,
> -			      struct fsnotify_event *event,
> -			      int (*merge)(struct fsnotify_group *,
> -					   struct fsnotify_event *),
> -			      void (*insert)(struct fsnotify_group *,
> -					     struct fsnotify_event *));
> +extern int fsnotify_insert_event(struct fsnotify_group *group,
> +				 struct fsnotify_event *event,
> +				 int (*merge)(struct fsnotify_group *,
> +					      struct fsnotify_event *),
> +				 void (*insert)(struct fsnotify_group *,
> +						struct fsnotify_event *));
> +
> +static inline int fsnotify_add_event(struct fsnotify_group *group,
> +				     struct fsnotify_event *event,
> +				     int (*merge)(struct fsnotify_group *,
> +						  struct fsnotify_event *))
> +{
> +	return fsnotify_insert_event(group, event, merge, NULL);
> +}
> +
>  /* Queue overflow event to a notification group */
>  static inline void fsnotify_queue_overflow(struct fsnotify_group *group)
>  {
> -	fsnotify_add_event(group, group->overflow_event, NULL, NULL);
> +	fsnotify_add_event(group, group->overflow_event, NULL);
>  }
>  
>  static inline bool fsnotify_is_overflow_event(u32 mask)
> -- 
> 2.32.0
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR