[RFC PATCH 1/3][e2fsprogs] Add 64-bit IO manager operations to struct_io_manager.

["Jose R. Santos" <jrs@us.ibm.com>]

From: Jose R. Santos <jrs@us.ibm.com>

Add 64-bit IO manager operations to struct_io_manager.

In order to provide 64-bit block support for IO managers an maintain
ABI compatibility with the old API, some new functions need to be
added to struct_io_manger.  Luckily, strcut_io_manager has some
reserved space that we can use to add these new functions.

Signed-off-by: Jose R. Santos <jrs@us.ibm.com>
--

 lib/ext2fs/ext2_io.h |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/lib/ext2fs/ext2_io.h b/lib/ext2fs/ext2_io.h
index 864d1f9..e3b0b1e 100644
--- a/lib/ext2fs/ext2_io.h
+++ b/lib/ext2fs/ext2_io.h
@@ -79,7 +79,11 @@ struct struct_io_manager {
 	errcode_t (*set_option)(io_channel channel, const char *option, 
 				const char *arg);
 	errcode_t (*get_stats)(io_channel channel, io_stats *io_stats);
-	int		reserved[14];
+	errcode_t (*read_blk64)(io_channel channel, unsigned long long block,
+					int count, void *data);
+	errcode_t (*write_blk64)(io_channel channel, unsigned long long block,
+					int count, const void *data);
+	int		reserved[12];
 };
 
 #define IO_FLAG_RW		0x0001
@@ -91,7 +95,9 @@ struct struct_io_manager {
 #define io_channel_close(c) 		((c)->manager->close((c)))
 #define io_channel_set_blksize(c,s)	((c)->manager->set_blksize((c),s))
 #define io_channel_read_blk(c,b,n,d)	((c)->manager->read_blk((c),b,n,d))
+#define io_channel_read_blk64(c,b,n,d)	((c)->manager->read_blk64((c),b,n,d))
 #define io_channel_write_blk(c,b,n,d)	((c)->manager->write_blk((c),b,n,d))
+#define io_channel_write_blk64(c,b,n,d) ((c)->manager->write_blk64((c),b,n,d))
 #define io_channel_flush(c) 		((c)->manager->flush((c)))
 #define io_channel_bumpcount(c)		((c)->refcount++)