feat: vfs - add dynamic filesystem mounts and safe unmount lifecycle

kernel/src/Fs/Boot.cpp

@@ -54,19 +54,38 @@ namespace Fs {
             return hasRamdisk;
         }
 
+        // The ramdisk is a singleton, so it has no per-mount state and ignores
+        // ctx. These shims exist only to match the FsDriver signature.
+        int RdOpen(void*, const char* p) { return Ramdisk::Open(p); }
+        int RdRead(void*, int h, uint8_t* b, uint64_t o, uint64_t s) { return Ramdisk::Read(h, b, o, s); }
+        uint64_t RdGetSize(void*, int h) { return Ramdisk::GetSize(h); }
+        void RdClose(void*, int h) { Ramdisk::Close(h); }
+        int RdReadDir(void*, const char* p, const char** o, int m) { return Ramdisk::ReadDir(p, o, m); }
+        int RdWrite(void*, int h, const uint8_t* b, uint64_t o, uint64_t s) { return Ramdisk::Write(h, b, o, s); }
+        int RdCreate(void*, const char* p) { return Ramdisk::Create(p); }
+        int RdDelete(void*, const char* p) { return Ramdisk::Delete(p); }
+        int RdMkdir(void*, const char* p) { return Ramdisk::Mkdir(p); }
+        int RdRename(void*, const char* o, const char* n) { return Ramdisk::Rename(o, n); }
+        const char* RdGetLabel(void*) { return Ramdisk::GetLabel(); }
+        int RdReadDirAt(void*, const char* p, const char** o, int m, int s) { return Ramdisk::ReadDirAt(p, o, m, s); }
+
         Vfs::FsDriver g_ramdiskDriver = {
-            Ramdisk::Open,
-            Ramdisk::Read,
-            Ramdisk::GetSize,
-            Ramdisk::Close,
-            Ramdisk::ReadDir,
-            Ramdisk::Write,
-            Ramdisk::Create,
-            Ramdisk::Delete,
-            Ramdisk::Mkdir,
-            Ramdisk::Rename,
-            Ramdisk::GetLabel,
-            Ramdisk::ReadDirAt,
+            .ctx       = nullptr,
+            .Open      = RdOpen,
+            .Read      = RdRead,
+            .GetSize   = RdGetSize,
+            .Close     = RdClose,
+            .ReadDir   = RdReadDir,
+            .Write     = RdWrite,
+            .Create    = RdCreate,
+            .Delete    = RdDelete,
+            .Mkdir     = RdMkdir,
+            .Rename    = RdRename,
+            .GetLabel  = RdGetLabel,
+            .ReadDirAt = RdReadDirAt,
+            .Stat      = nullptr,
+            // Statically allocated: nothing to release.
+            .Unmount   = nullptr,
         };
 
     }