[PATCH pve-manager v2] fix #3936: ui: storage: add validation for ZFS blocksize

[David Riley <d.riley@proxmox.com>]

Add validation to the ZFS storage blocksize form field to prevent
misconfigurations.

Validation [0][1]:
* Range: 512 bytes to 16 MiB
* Format: Allow positive integers with optional 'k' or 'm' suffix.
* Constraint: Must be a power of two.

Link: https://bugzilla.proxmox.com/show_bug.cgi?id=3936

[0] https://openzfs.github.io/openzfs-docs/man/v2.4/7/zfsprops.7.html#volblocksize
[1] https://openzfs.github.io/openzfs-docs/man/v2.4/7/zfsprops.7.html#recordsize

Reviewed-by: Fiona Ebner <f.ebner@proxmox.com>
Signed-off-by: David Riley <d.riley@proxmox.com>
---

Notes:
    v2:
    * Renamed function to follow the style guide (camelCase)
    * combined checks power-of-two and range check
    * Adapted error message

 www/manager6/Utils.js               | 28 ++++++++++++++++++++++++++++
 www/manager6/storage/ZFSEdit.js     |  1 +
 www/manager6/storage/ZFSPoolEdit.js |  1 +
 3 files changed, 30 insertions(+)

diff --git a/www/manager6/Utils.js b/www/manager6/Utils.js
index 01e80682..2ed4e65d 100644
--- a/www/manager6/Utils.js
+++ b/www/manager6/Utils.js
@@ -274,6 +274,34 @@ Ext.define('PVE.Utils', {
             return '<i class="fa fa-' + iconCls + '"></i> ' + value;
         },
 
+        validateZfsBlocksize: function (value) {
+            if (!value) {
+                return true;
+            }
+
+            let match = value.match(/^([1-9][0-9]*)([km])?$/i);
+            if (!match) {
+                return gettext(
+                    'Invalid format. Use numbers with optional k or m suffix (e.g., 16k).',
+                );
+            }
+
+            let bytes = parseInt(match[1], 10);
+            let suffix = match[2]?.toLowerCase();
+
+            if (suffix === 'k') {
+                bytes *= 1024;
+            } else if (suffix === 'm') {
+                bytes *= 1024 * 1024;
+            }
+
+            if (bytes < 512 || (bytes & (bytes - 1)) !== 0 || bytes > 16 * 1024 * 1024) {
+                return gettext('Value must be a power of 2 between 512 and 16m');
+            }
+
+            return true;
+        },
+
         render_pbs_fingerprint: (fp) => fp.substring(0, 23),
 
         render_backup_encryption: function (v, meta, record) {
diff --git a/www/manager6/storage/ZFSEdit.js b/www/manager6/storage/ZFSEdit.js
index e9d24642..0d7a971c 100644
--- a/www/manager6/storage/ZFSEdit.js
+++ b/www/manager6/storage/ZFSEdit.js
@@ -67,6 +67,7 @@ Ext.define('PVE.storage.ZFSInputPanel', {
                 value: '4k',
                 fieldLabel: gettext('Block Size'),
                 allowBlank: false,
+                validator: PVE.Utils.validateZfsBlocksize,
             },
             {
                 xtype: me.isCreate ? 'textfield' : 'displayfield',
diff --git a/www/manager6/storage/ZFSPoolEdit.js b/www/manager6/storage/ZFSPoolEdit.js
index 0066dfef..6789b9a3 100644
--- a/www/manager6/storage/ZFSPoolEdit.js
+++ b/www/manager6/storage/ZFSPoolEdit.js
@@ -106,6 +106,7 @@ Ext.define('PVE.storage.ZFSPoolInputPanel', {
             emptyText: '16k',
             fieldLabel: gettext('Block Size'),
             allowBlank: true,
+            validator: PVE.Utils.validateZfsBlocksize,
         },
     ],
 });
-- 
2.47.3