added some definitions for readonly features

we already support the extra isize feature, so it's now added
removed unused Inode::AttributeBlockReadAt()
group_descriptor_size was previously a reserved field in the super block


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@39125 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/add-ons/kernel/file_systems/ext2/Inode.cpp

@@ -478,36 +478,6 @@ Inode::Resize(Transaction& transaction, off_t size)
 }
 
 
-status_t
-Inode::AttributeBlockReadAt(off_t pos, uint8* buffer, size_t* _length)
-{
-	TRACE("Inode::%s(%Ld, , %lu)\n", __FUNCTION__, pos, *_length);
-	size_t length = *_length;
-
-	if (!fAttributesBlock) {
-		uint32 block = Node().ExtendedAttributesBlock();
-
-		if (block == 0)
-			return B_ENTRY_NOT_FOUND;
-
-		TRACE("inode %Ld attributes at block %lu\n", ID(), block);
-		fAttributesBlock = (ext2_xattr_header*)block_cache_get(
-			GetVolume()->BlockCache(), block);
-	}
-
-	if (!fAttributesBlock)
-		return B_ENTRY_NOT_FOUND;
-
-	if (pos < 0LL || ((uint32)pos + length) > GetVolume()->BlockSize())
-		return ERANGE;
-
-	memcpy(buffer, ((uint8 *)fAttributesBlock) + (uint32)pos, length);
-
-	*_length = length;
-	return B_NO_ERROR;
-}
-
-
 status_t
 Inode::InitDirectory(Transaction& transaction, Inode* parent)
 {

src/add-ons/kernel/file_systems/ext2/Inode.h

@@ -87,9 +87,6 @@ public:
 
 			status_t	Resize(Transaction& transaction, off_t size);
 
-			status_t	AttributeBlockReadAt(off_t pos, uint8 *buffer,
-							size_t *length);
-
 			ext2_inode&	Node() { return fNode; }
 
 			status_t	InitDirectory(Transaction& transaction, Inode* parent);

src/add-ons/kernel/file_systems/ext2/Volume.cpp

@@ -497,7 +497,8 @@ Volume::_UnsupportedReadOnlyFeatures(ext2_super_block& superBlock)
 {
 	uint32 supportedReadOnly = EXT2_READ_ONLY_FEATURE_SPARSE_SUPER
 		| EXT2_READ_ONLY_FEATURE_LARGE_FILE
-		| EXT2_READ_ONLY_FEATURE_HUGE_FILE;
+		| EXT2_READ_ONLY_FEATURE_HUGE_FILE
+		| EXT2_READ_ONLY_FEATURE_EXTRA_ISIZE;
 	// TODO actually implement EXT2_READ_ONLY_FEATURE_SPARSE_SUPER when
 	// implementing superblock backup copies
 

src/add-ons/kernel/file_systems/ext2/ext2.h

@@ -65,7 +65,7 @@ struct ext2_super_block {
 	uint32	hash_seed[4];
 	uint8	default_hash_version;
 	uint8	_reserved1;
-	uint16	_reserved2;
+	uint16	group_descriptor_size;
 	uint32	default_mount_options;
 	uint32	first_meta_block_group;
 	uint32	fs_creation_time;
@@ -116,6 +116,8 @@ struct ext2_super_block {
 		{ return (ino_t)B_LENDIAN_TO_HOST_INT32(last_orphan); }
 	uint32 HashSeed(uint8 i) const
 		{ return B_LENDIAN_TO_HOST_INT32(hash_seed[i]); }
+	uint16 GroupDescriptorSize() const
+		{ return B_LENDIAN_TO_HOST_INT16(group_descriptor_size); }
 
 	void SetFreeInodes(uint32 freeInodes)
 		{ free_inodes = B_HOST_TO_LENDIAN_INT32(freeInodes); }
@@ -152,6 +154,9 @@ struct ext2_super_block {
 #define EXT2_READ_ONLY_FEATURE_LARGE_FILE		0x0002
 #define EXT2_READ_ONLY_FEATURE_BTREE_DIRECTORY	0x0004
 #define EXT2_READ_ONLY_FEATURE_HUGE_FILE		0x0008
+#define EXT2_READ_ONLY_FEATURE_GDT_CSUM			0x0010
+#define EXT2_READ_ONLY_FEATURE_DIR_NLINK		0x0020
+#define EXT2_READ_ONLY_FEATURE_EXTRA_ISIZE		0x0040
 
 // incompatible features
 #define EXT2_INCOMPATIBLE_FEATURE_COMPRESSION	0x0001
@@ -508,7 +513,7 @@ struct ext2_dir_entry {
 } _PACKED;
 
 // file types
-#define EXT2_TYPE_UNKOWN		0
+#define EXT2_TYPE_UNKNOWN		0
 #define EXT2_TYPE_FILE			1
 #define EXT2_TYPE_DIRECTORY		2
 #define EXT2_TYPE_CHAR_DEVICE	3