fuse2fs: fix block parameter truncation on 32-bit

fuse2fs: fix block parameter truncation on 32-bit

Use the blk64_t variants of the io channel read/write methods when we
have to do partial block zeroing for hole punching because otherwise
we corrupt large 64-bit filesystems on 32-bit fuse2fs due to integer
truncation.

Cc: linux-ext4@vger.kernel.org # v1.43
Fixes: 81cbf1ef4f5dab ("misc: add fuse2fs, a FUSE server for e2fsprogs")
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Link: https://lore.kernel.org/r/20250730172324.GR2672022@frogsfrogsfrogs
Signed-off-by: Theodore Ts'o <tytso@mit.edu>