diff mbox series

[RFC,01/15] fanotify: Fold event size calculation to its own function

Message ID 20210426184201.4177978-2-krisman@collabora.com (mailing list archive)
State New, archived
Headers show
Series File system wide monitoring | expand

Commit Message

Gabriel Krisman Bertazi April 26, 2021, 6:41 p.m. UTC 
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@collabora.com>
---
 fs/notify/fanotify/fanotify_user.c | 40 +++++++++++++++++-------------
 1 file changed, 23 insertions(+), 17 deletions(-)

Comments

Amir Goldstein April 27, 2021, 4:42 a.m. UTC | #1 
On Mon, Apr 26, 2021 at 9:42 PM Gabriel Krisman Bertazi
<krisman@collabora.com> 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@collabora.com>

Nice

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

> ---
>  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
>
diff mbox series

Patch

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;