fs: nvs: Add recovery path for corrupted NVS

When all sectors of the settings partition have some data that is not 0xFF, NVS will fail to initialize settings. Add a recovery path to erase the whole settings partition and recover. Should not happen unless there's some serious flash corruption, or possibly interrupted garbage collection. Verified by recreating the scenario with flash CLIs.

Signed-off-by: Cory Andrew Mayer <[email protected]>

subsys/fs/nvs/nvs.c

@@ -781,10 +781,16 @@ static int nvs_startup(struct nvs_fs *fs)
 			}
 		}
 	}
-	/* all sectors are closed, this is not a nvs fs */
+	/* all sectors are closed, irreparably corrupted, erase and start over */
 	if (closed_sectors == fs->sector_count) {
-		rc = -EDEADLK;
-		goto end;
+		LOG_WRN("All sectors closed, erasing all settings...");
+		addr = 0U;
+		rc = flash_erase(fs->flash_device, 0, fs->sector_size * fs->sector_count);
+		if (rc) {
+			rc = -EIO;
+			goto end;
+		}
+		i = 0;
 	}
 
 	if (i == fs->sector_count) {