On Mon, Apr 26, 2021 at 9:42 PM Gabriel Krisman Bertazi
<krisman@xxxxxxxxxxxxx> wrote:
>
> Every time this function is invoked, it is immediately added to
> FAN_EVENT_METADATA_LEN, since there is no need to just calculate the
> length of info records. This minor clean up folds the rest of the
> calculation into the function, which now operates in terms of events,
> returning the size of the entire event, including metadata.
>
> Signed-off-by: Gabriel Krisman Bertazi <krisman@xxxxxxxxxxxxx>
Nice
Reviewed-by: Amir Goldstein <amir73il@xxxxxxxxx>
> ---
> fs/notify/fanotify/fanotify_user.c | 40 +++++++++++++++++-------------
> 1 file changed, 23 insertions(+), 17 deletions(-)
>
> diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
> index 9e0c1afac8bd..0332c4afeec3 100644
> --- a/fs/notify/fanotify/fanotify_user.c
> +++ b/fs/notify/fanotify/fanotify_user.c
> @@ -64,17 +64,24 @@ static int fanotify_fid_info_len(int fh_len, int name_len)
> return roundup(FANOTIFY_INFO_HDR_LEN + info_len, FANOTIFY_EVENT_ALIGN);
> }
>
> -static int fanotify_event_info_len(unsigned int fid_mode,
> - struct fanotify_event *event)
> +static size_t fanotify_event_len(struct fanotify_event *event,
> + unsigned int fid_mode)
> {
> - struct fanotify_info *info = fanotify_event_info(event);
> - int dir_fh_len = fanotify_event_dir_fh_len(event);
> - int fh_len = fanotify_event_object_fh_len(event);
> - int info_len = 0;
> + size_t event_len = FAN_EVENT_METADATA_LEN;
> + struct fanotify_info *info;
> + int dir_fh_len;
> + int fh_len;
> int dot_len = 0;
>
> + if (!fid_mode)
> + return event_len;
> +
> + info = fanotify_event_info(event);
> + dir_fh_len = fanotify_event_dir_fh_len(event);
> + fh_len = fanotify_event_object_fh_len(event);
> +
> if (dir_fh_len) {
> - info_len += fanotify_fid_info_len(dir_fh_len, info->name_len);
> + event_len += fanotify_fid_info_len(dir_fh_len, info->name_len);
> } else if ((fid_mode & FAN_REPORT_NAME) && (event->mask & FAN_ONDIR)) {
> /*
> * With group flag FAN_REPORT_NAME, if name was not recorded in
> @@ -84,9 +91,9 @@ static int fanotify_event_info_len(unsigned int fid_mode,
> }
>
> if (fh_len)
> - info_len += fanotify_fid_info_len(fh_len, dot_len);
> + event_len += fanotify_fid_info_len(fh_len, dot_len);
>
> - return info_len;
> + return event_len;
> }
>
> /*
> @@ -98,7 +105,8 @@ static int fanotify_event_info_len(unsigned int fid_mode,
> static struct fanotify_event *get_one_event(struct fsnotify_group *group,
> size_t count)
> {
> - size_t event_size = FAN_EVENT_METADATA_LEN;
> + size_t event_size;
> + struct fsnotify_event *fse;
> struct fanotify_event *event = NULL;
> unsigned int fid_mode = FAN_GROUP_FLAG(group, FANOTIFY_FID_BITS);
>
> @@ -108,16 +116,15 @@ static struct fanotify_event *get_one_event(struct fsnotify_group *group,
> if (fsnotify_notify_queue_is_empty(group))
> goto out;
>
> - if (fid_mode) {
> - event_size += fanotify_event_info_len(fid_mode,
> - FANOTIFY_E(fsnotify_peek_first_event(group)));
> - }
> + fse = fsnotify_peek_first_event(group);
> + event = FANOTIFY_E(fse);
> + event_size = fanotify_event_len(event, fid_mode);
>
> if (event_size > count) {
> event = ERR_PTR(-EINVAL);
> goto out;
> }
> - event = FANOTIFY_E(fsnotify_remove_first_event(group));
> + fsnotify_remove_queued_event(group, fse);
> if (fanotify_is_perm_event(event->mask))
> FANOTIFY_PERM(event)->state = FAN_EVENT_REPORTED;
> out:
> @@ -334,8 +341,7 @@ static ssize_t copy_event_to_user(struct fsnotify_group *group,
>
> pr_debug("%s: group=%p event=%p\n", __func__, group, event);
>
> - metadata.event_len = FAN_EVENT_METADATA_LEN +
> - fanotify_event_info_len(fid_mode, event);
> + metadata.event_len = fanotify_event_len(event, fid_mode);
> metadata.metadata_len = FAN_EVENT_METADATA_LEN;
> metadata.vers = FANOTIFY_METADATA_VERSION;
> metadata.reserved = 0;
> --
> 2.31.0
>
