BTRFS: Implement GetNewBlock() function that will find the logical address for allocating and convert it to physical block.

Signed-off-by: Augustin Cavalier <[email protected]>

src/add-ons/kernel/file_systems/btrfs/Volume.cpp

@@ -534,6 +534,20 @@ Volume::FindBlock(off_t logical, off_t& physical)
 }
 
 
+/* Wrapper function for allocating new block
+ */
+status_t
+Volume::GetNewBlock(uint64& logical, fsblock_t& physical, uint64 start,
+	uint64 flags)
+{
+	status_t status = fExtentAllocator->AllocateTreeBlock(logical, start, flags);
+	if (status != B_OK)
+		return status;
+
+	return FindBlock(logical, physical);
+}
+
+
 //	#pragma mark - Disk scanning and initialization
 
 

src/add-ons/kernel/file_systems/btrfs/Volume.h

@@ -62,6 +62,9 @@ public:
 
 			status_t			FindBlock(off_t logical, fsblock_t& physical);
 			status_t			FindBlock(off_t logical, off_t& physical);
+			status_t			GetNewBlock(uint64& logical, fsblock_t& physical,
+									uint64 start = (uint64)-1,
+									uint64 flags = BTRFS_BLOCKGROUP_FLAG_METADATA);
 
 private:
 			mutex				fLock;