[PATCH v2] btrfs-progs: convert: Add 64 bit block numbers support

[Srivathsa Dara <srivathsa.d.dara@oracle.com>]

In ext4, number of blocks can be greater than 2^32. Therefore, if
btrfs-convert is used on filesystems greater than 16TiB (Staring from
16TiB, number of blocks overflow 32 bits), it fails to convert.

Example:

Here, /dev/sdc1 is 16TiB partition intitialized with an ext4 filesystem.

[root@rasivara-arm2 opc]# btrfs-convert -d -p /dev/sdc1
btrfs-convert from btrfs-progs v5.15.1

convert/main.c:1164: do_convert: Assertion `cctx.total_bytes != 0` failed, value 0
btrfs-convert(+0xfd04)[0xaaaaba44fd04]
btrfs-convert(main+0x258)[0xaaaaba44d278]
/lib64/libc.so.6(__libc_start_main+0xdc)[0xffffb962777c]
btrfs-convert(+0xd4fc)[0xaaaaba44d4fc]
Aborted (core dumped)

Fix it by considering 64 bit block numbers.

Signed-off-by: Srivathsa Dara <srivathsa.d.dara@oracle.com>
---
 convert/source-ext2.c | 6 +++---
 convert/source-ext2.h | 2 +-
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/convert/source-ext2.c b/convert/source-ext2.c
index 2186b252..afa48606 100644
--- a/convert/source-ext2.c
+++ b/convert/source-ext2.c
@@ -288,8 +288,8 @@ error:
 	return -1;
 }
 
-static int ext2_block_iterate_proc(ext2_filsys fs, blk_t *blocknr,
-			        e2_blkcnt_t blockcnt, blk_t ref_block,
+static int ext2_block_iterate_proc(ext2_filsys fs, blk64_t *blocknr,
+			        e2_blkcnt_t blockcnt, blk64_t ref_block,
 			        int ref_offset, void *priv_data)
 {
 	int ret;
@@ -323,7 +323,7 @@ static int ext2_create_file_extents(struct btrfs_trans_handle *trans,
 	init_blk_iterate_data(&data, trans, root, btrfs_inode, objectid,
 			convert_flags & CONVERT_FLAG_DATACSUM);
 
-	err = ext2fs_block_iterate2(ext2_fs, ext2_ino, BLOCK_FLAG_DATA_ONLY,
+	err = ext2fs_block_iterate3(ext2_fs, ext2_ino, BLOCK_FLAG_DATA_ONLY,
 				    NULL, ext2_block_iterate_proc, &data);
 	if (err)
 		goto error;
diff --git a/convert/source-ext2.h b/convert/source-ext2.h
index d204aac5..62c9b1fa 100644
--- a/convert/source-ext2.h
+++ b/convert/source-ext2.h
@@ -46,7 +46,7 @@ struct btrfs_trans_handle;
 #define ext2fs_get_block_bitmap_range2 ext2fs_get_block_bitmap_range
 #define ext2fs_inode_data_blocks2 ext2fs_inode_data_blocks
 #define ext2fs_read_ext_attr2 ext2fs_read_ext_attr
-#define ext2fs_blocks_count(s)		((s)->s_blocks_count)
+#define ext2fs_blocks_count(s)		(((s)->s_blocks_count_hi << 32) | (s)->s_blocks_count)
 #define EXT2FS_CLUSTER_RATIO(fs)	(1)
 #define EXT2_CLUSTERS_PER_GROUP(s)	(EXT2_BLOCKS_PER_GROUP(s))
 #define EXT2FS_B2C(fs, blk)		(blk)
-- 
2.39.3