Multisite: Show upload space usage for a subsite

src/wp-admin/includes/dashboard.php

@@ -1628,38 +1628,45 @@ function wp_dashboard_primary_output( $widget_id, $feeds ) {
 }
 
 /**
- * Displays file upload quota on dashboard.
+ * Displays storage space information of a blog on the WordPress dashboard.
  *
  * Runs on the {@see 'activity_box_end'} hook in wp_dashboard_right_now().
  *
+ * This function checks the space used and the space allowed for uploads on the site,
+ * then displays this information in the dashboard with a link to manage uploads.
+ * It also includes a visual warning if the space usage exceeds 70% of the allowed quota.
+ *
  * @since 3.0.0
  *
- * @return true|void True if not multisite, user can't upload files, or the space check option is disabled.
+ * @return true|void True if not multisite, user can't upload files; else it outputs the storage space information directly in the dashboard.
+ *
+ * @see get_space_usage() for retrieving the current space usage information in formatted string.
  */
 function wp_dashboard_quota() {
-	if ( ! is_multisite() || ! current_user_can( 'upload_files' )
-		|| get_site_option( 'upload_space_check_disabled' )
-	) {
+	if ( ! is_multisite() || ! current_user_can( 'upload_files' ) ) {
 		return true;
 	}
 
-	$quota = get_space_allowed();
-	$used  = get_space_used();
+	$used = get_space_used();
 
-	if ( $used > $quota ) {
-		$percentused = '100';
-	} else {
-		$percentused = ( $used / $quota ) * 100;
+	$used_class = '';
+	if ( ! get_site_option( 'upload_space_check_disabled' ) ) {
+		$quota = get_space_allowed();
+		if ( $used > $quota ) {
+			$percentused = '100';
+		} else {
+			$percentused = ( $used / $quota ) * 100;
+			$used_class  = ( $percentused >= 70 ) ? ' warning' : '';
+			$percentused = number_format( $percentused );
+		}
 	}
 
-	$used_class  = ( $percentused >= 70 ) ? ' warning' : '';
-	$used        = round( $used, 2 );
-	$percentused = number_format( $percentused );
-
+	$used = round( $used, 2 );
 	?>
 	<h3 class="mu-storage"><?php _e( 'Storage Space' ); ?></h3>
 	<div class="mu-storage">
-	<ul>
+	<ul> 
+	<?php if ( isset( $quota ) ) : ?>
 		<li class="storage-count">
 			<?php
 			$text = sprintf(
@@ -1675,18 +1682,14 @@ function wp_dashboard_quota() {
 				__( 'Manage Uploads' )
 			);
 			?>
-		</li><li class="storage-count <?php echo $used_class; ?>">
+		</li>
+	<?php endif; ?>
+		<li class="storage-count <?php echo $used_class; ?>">
 			<?php
-			$text = sprintf(
-				/* translators: 1: Number of megabytes, 2: Percentage. */
-				__( '%1$s MB (%2$s%%) Space Used' ),
-				number_format_i18n( $used, 2 ),
-				$percentused
-			);
 			printf(
 				'<a href="%1$s" class="musublink">%2$s<span class="screen-reader-text"> (%3$s)</span></a>',
 				esc_url( admin_url( 'upload.php' ) ),
-				$text,
+				get_space_usage(),
 				/* translators: Hidden accessibility text. */
 				__( 'Manage Uploads' )
 			);

src/wp-admin/includes/ms-admin-filters.php

@@ -9,6 +9,8 @@
 
 // Media hooks.
 add_filter( 'wp_handle_upload_prefilter', 'check_upload_size' );
+add_action( 'post-upload-ui', 'display_space_usage' );
+add_action( 'load-upload.php', 'upload_page_notice_display_space_usage_notice' );
 
 // User hooks.
 add_action( 'user_admin_notices', 'new_user_email_admin_notice' );

src/wp-admin/includes/ms.php

@@ -248,25 +248,52 @@ function upload_is_user_over_quota( $display_message = true ) {
 }
 
 /**
- * Displays the amount of disk space used by the current site. Not used in core.
+ * Displays the space usage details by the current site.
+ *
+ * This function echoes the space usage information retrieved from the
+ * `get_space_usage` function, wrapped in a `<strong>` HTML tag for emphasis.
+ *
+ * @return void This function does not return a value; it outputs the space usage directly.
+ *
+ * @see get_space_usage() for the function that retrieves the space usage information.
  *
  * @since MU (3.0.0)
  */
 function display_space_usage() {
-	$space_allowed = get_space_allowed();
-	$space_used    = get_space_used();
+	echo '<strong>' . get_space_usage() . '</strong>';
+}
 
-	$percent_used = ( $space_used / $space_allowed ) * 100;
+/**
+ * Displays a notice in the WordPress admin area showing the current storage space usage.
+ *
+ * This function outputs an HTML notice containing the storage space usage information.
+ * The notice is styled as a success message and is dismissible. It uses the `display_space_usage`
+ * function to retrieve and display the actual storage usage details.
+ *
+ * @see get_space_usage() for the function that retrieves the space usage information.
+ *
+ * @hook admin_notices
+ *
+ * @return void This function does not return a value; it directly outputs HTML.
+ */
+function display_space_usage_notice() {
+	echo '<div class="notice notice-success is-dismissible">';
+	echo '<p><strong>' . esc_html__( 'Storage Space' ) . ':</strong> ';
+	echo get_space_usage();
+	echo '</p></div>';
+}
 
-	$space = size_format( $space_allowed * MB_IN_BYTES );
-	?>
-	<strong>
-	<?php
-		/* translators: Storage space that's been used. 1: Percentage of used space, 2: Total space allowed in megabytes or gigabytes. */
-		printf( __( 'Used: %1$s%% of %2$s' ), number_format( $percent_used ), $space );
-	?>
-	</strong>
-	<?php
+/**
+ * Hooks into the `load-upload.php` action to add the
+ * `display_space_usage_notice` function to the `admin_notices` hook.
+ *
+ * @hook load-upload.php
+ *
+ * @return void This function does not return a value; it only adds an action to the `admin_notices` hook.
+ */
+function upload_page_notice_display_space_usage_notice() {
+	// Add the admin_notices action only for the upload.php page
+	add_action( 'admin_notices', 'display_space_usage_notice' );
 }
 
 /**
@@ -295,7 +322,6 @@ function fix_import_form_size( $size ) {
 function upload_space_setting( $id ) {
 	switch_to_blog( $id );
 	$quota = get_option( 'blog_upload_space' );
-	restore_current_blog();
 
 	if ( ! $quota ) {
 		$quota = '';
@@ -313,10 +339,14 @@ function upload_space_setting( $id ) {
 				/* translators: Hidden accessibility text. */
 				_e( 'Size in megabytes' );
 				?>
-			</span> <?php _e( 'MB (Leave blank for network default)' ); ?></span>
+			</span><?php printf( '(Leave blank for network default: %s MB)', get_space_allowed() ); ?></span>
+			<p class="description blog-upload-space-count">
+			<?php echo get_space_usage(); ?>
+			</p>
 		</td>
 	</tr>
 	<?php
+	restore_current_blog();
 }
 
 /**

src/wp-includes/ms-functions.php

@@ -2691,6 +2691,41 @@ function upload_size_limit_filter( $size ) {
 	return min( $size, $max_fileupload_in_bytes, get_upload_space_available() );
 }
 
+/**
+ * Retrieves the space usage details for the site.
+ *
+ * This function calculates and returns the space used for uploads in the site.
+ * If the upload space check is disabled, it returns a simple message showing the
+ * space used. Otherwise, it provides more detailed information including the
+ * percentage of space used and the total space allowed.
+ *
+ * @return string Formatted string indicating space usage. The format depends on
+ *                whether the upload space check is enabled or not.
+ */
+function get_space_usage() {
+	$space_used = get_space_used();
+
+	if ( '1' === get_site_option( 'upload_space_check_disabled' ) ) {
+		return sprintf(
+			/* translators: 1: Number of megabytes */
+			__( '%s MB Space Used' ),
+			number_format_i18n( $space_used, 2 )
+		);
+	} else {
+		$space_allowed = get_space_allowed();
+		$percent_used = ( $space_used / $space_allowed ) * 100;
+		$space = size_format( $space_allowed * MB_IN_BYTES );
+
+		/* translators: Storage space that's been used. 1: Used space in MB 2: Percentage of used space, 3: Total space allowed in megabytes or gigabytes. */
+		return sprintf(
+			__( 'Used: %1$s (%2$s%%) of %3$s' ),
+			number_format_i18n( $space_used, 2 ),
+			number_format( $percent_used ),
+			$space
+		);
+	}
+}
+
 /**
  * Determines whether or not we have a large network.
  *