feat(ext4): block and inode bitmap allocation/deallocation

crates/servers/storage-server/src/fs/ext4/mod.rs

@@ -1,6 +1,7 @@
 pub mod io;
 pub mod superblock;
 pub mod bgd;
+pub mod bitmap;
 
 use port_block_device::BlockDevice;
 use crate::filesystem::{DirEntry, FileHandle, FileName, FileSystem};
@@ -173,6 +174,26 @@ impl<B: BlockDevice> Ext4<B> {
         self.write_inode(inode_num, inode)
     }
 
+    pub fn alloc_block(&mut self) -> Option<u32> {
+        let spb = self.sb.sectors_per_block();
+        bitmap::alloc_block(&mut self.device, &mut self.sb, self.gdt_block, spb)
+    }
+
+    pub fn free_block(&mut self, block: u32) {
+        let spb = self.sb.sectors_per_block();
+        bitmap::free_block(&mut self.device, &mut self.sb, self.gdt_block, block, spb);
+    }
+
+    pub fn alloc_inode(&mut self) -> Option<u32> {
+        let spb = self.sb.sectors_per_block();
+        bitmap::alloc_inode(&mut self.device, &mut self.sb, self.gdt_block, spb)
+    }
+
+    pub fn free_inode(&mut self, inode: u32) {
+        let spb = self.sb.sectors_per_block();
+        bitmap::free_inode(&mut self.device, &mut self.sb, self.gdt_block, inode, spb);
+    }
+
     fn read_extents(&self, inode: &Inode) -> Option<Extent> {
         if !inode.uses_extents() { return None; }
         let hdr = &inode.block_data;