[PATCH proxmox-backup 3/3] ui: tuning: add GC chunk metadata prefetch option

[Enrico Plantulli <plantulli@gmail.com>]

The datastore option view rebuilds the tuning property string from the
fields of the form, so a tuning option that has no field is dropped as
soon as any other tuning option is edited in the GUI. Add the field for
gc-chunk-metadata-prefetch, and render it explicitly in the summary
instead of letting it fall through to the generic loop.

Signed-off-by: Enrico Plantulli <plantulli@gmail.com>
---
 www/Utils.js                |  6 ++++++
 www/datastore/OptionView.js | 16 ++++++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/www/Utils.js b/www/Utils.js
index d6bfd45..d09e02d 100644
--- a/www/Utils.js
+++ b/www/Utils.js
@@ -923,6 +923,12 @@ Ext.define('PBS.Utils', {
             `${gettext('GC cache capacity')}: ${gc_cache_capacity ?? Proxmox.Utils.defaultText}`,
         );
 
+        let gc_chunk_metadata_prefetch = tuning['gc-chunk-metadata-prefetch'];
+        delete tuning['gc-chunk-metadata-prefetch'];
+        options.push(
+            `${gettext('GC chunk metadata prefetch')}: ${gc_chunk_metadata_prefetch ?? false}`,
+        );
+
         let verification_workers = tuning['default-verification-workers'];
         delete tuning['default-verification-workers'];
         options.push(`${gettext('Default verification workers')}: ${verification_workers ?? 4}`);
diff --git a/www/datastore/OptionView.js b/www/datastore/OptionView.js
index 42a6104..a385633 100644
--- a/www/datastore/OptionView.js
+++ b/www/datastore/OptionView.js
@@ -338,6 +338,22 @@ Ext.define('PBS.Datastore.Options', {
                             deleteEmpty: true,
                             step: 1024,
                         },
+                        {
+                            xtype: 'proxmoxcheckbox',
+                            name: 'gc-chunk-metadata-prefetch',
+                            fieldLabel: gettext('GC Chunk Metadata Prefetch'),
+                            labelWidth: 200,
+                            autoEl: {
+                                tag: 'div',
+                                'data-qtip': gettext(
+                                    'Iterate chunk directories before GC phase 1 to load chunk metadata in bulk',
+                                ),
+                            },
+                            value: 0,
+                            uncheckedValue: 0,
+                            defaultValue: 0,
+                            deleteDefaultValue: true,
+                        },
                         {
                             xtype: 'proxmoxintegerfield',
                             name: 'default-verification-readers',
-- 
2.47.3