feat: support for USB mass storage devices, hotplugging

kernel/src/Fs/FsProbe.hpp

@@ -18,12 +18,20 @@ namespace Fs::FsProbe {
     // Register a filesystem probe function (called once per FS driver at init).
     void Register(ProbeFn fn);
 
-    // Probe all discovered GPT partitions and auto-mount recognized filesystems.
-    // Assigns VFS drive numbers starting from firstDrive.
+    // Probe all discovered storage partitions and auto-mount recognized filesystems.
+    // Assigns each partition the lowest available VFS drive number at or above firstDrive.
     void MountPartitions(int firstDrive = 1);
 
+    // Probe discovered partitions for a single block device and mount recognized
+    // filesystems at the lowest currently available VFS drive numbers.
+    int MountPartitionsForBlockDevice(int blockDevIndex, int firstDrive = 0);
+
     // Try to mount a single partition (by global partition index) as the given VFS drive.
     // Returns 0 on success, -1 if no probe recognized the filesystem.
     int MountPartition(int partIndex, int driveNum);
 
+    // Unmount every VFS drive backed by partitions on a block device and compact
+    // mount bookkeeping to match Gpt::RemovePartitionsForBlockDevice().
+    int UnmountPartitionsForBlockDevice(int blockDevIndex);
+
 };