read_fs_info() hook for xfs

xfs: read_fs_info() hook.

Change-Id: I817b1ca2cd37d1dc894cdeefac967f659cfcb502
Reviewed-on: https://review.haiku-os.org/c/haiku/+/2416
Reviewed-by: Adrien Destugues <[email protected]>

src/add-ons/kernel/file_systems/xfs/kernel_interface.cpp

@@ -7,6 +7,8 @@
 #include "Volume.h"
 
 
+#define XFS_IO_SIZE	65536
+
 struct identify_cookie
 {
 	/*	super_block_struct super_block;
@@ -108,7 +110,20 @@ xfs_unmount(fs_volume *_volume)
 static status_t
 xfs_read_fs_info(fs_volume *_volume, struct fs_info *info)
 {
-	return B_NOT_SUPPORTED;
+	Volume* volume = (Volume*)_volume->private_volume;
+
+	info->flags = B_FS_IS_READONLY
+					| B_FS_HAS_ATTR | B_FS_IS_PERSISTENT;
+
+	info->io_size = XFS_IO_SIZE;
+	info->block_size = volume->SuperBlock().BlockSize();
+	info->total_blocks = volume->SuperBlock().TotalBlocks();
+	info->free_blocks = volume->SuperBlock().FreeBlocks();
+
+	strlcpy(info->volume_name, volume->Name(), sizeof(info->volume_name));
+	strlcpy(info->fsh_name, "xfs", sizeof(info->fsh_name));
+
+	return B_OK;
 }
 
 

src/add-ons/kernel/file_systems/xfs/xfs.cpp

@@ -11,7 +11,7 @@ XfsSuperBlock::IsValid()
 {
 	if (sb_magicnum != XFS_SB_MAGIC) return false;
 
-	if (BBLOCKSIZE <= sb_blocksize){
+	if (BBLOCKSIZE > sb_blocksize){
 		ERROR("Basic block is less than 512 bytes!");
 		return false;
 	}
@@ -34,6 +34,34 @@ XfsSuperBlock::Size()
 }
 
 
+xfs_rfsblock_t
+XfsSuperBlock::TotalBlocks()
+{
+	return sb_dblocks;
+}
+
+
+xfs_rfsblock_t
+XfsSuperBlock::TotalBlocksWithLog()
+{
+	return TotalBlocks() + sb_logblocks;
+}
+
+
+uint64
+XfsSuperBlock::FreeBlocks()
+{
+	return sb_fdblocks;
+}
+
+
+uint64
+XfsSuperBlock::UsedBlocks()
+{
+	return TotalBlocks() - FreeBlocks();
+}
+
+
 char*
 XfsSuperBlock::Name()
 {

src/add-ons/kernel/file_systems/xfs/xfs.h

@@ -29,6 +29,10 @@ public:
 			bool 			IsValid();
 			char*			Name();
 			uint32			BlockSize();
+			xfs_rfsblock_t	TotalBlocks();
+			xfs_rfsblock_t	TotalBlocksWithLog();
+			uint64			FreeBlocks();
+			uint64			UsedBlocks();
 			uint32			Size();
 			void			SwapEndian();
 
@@ -149,6 +153,7 @@ for reverse-mapped B+Trees. I have spare0/1 defined here instead.
 #define XFS_AG_MAGICNUM 0x58414746
 class AGFreeSpace{
 	public:
+			//TODO:
 			void			SwapEndian();
 	private:
 			uint32			magicnum;
@@ -172,7 +177,7 @@ class AGFreeSpace{
 			*/
 
 			uint32			btreeblks;
-}
+};
 
 
 #endif