ext4: remove handle parameters from zero partial block functions

ext4: remove handle parameters from zero partial block functions

Only journal data mode requires an active journal handle when zeroing
partial blocks. Stop passing handle_t *handle to
ext4_zero_partial_blocks() and related functions, and make
ext4_block_journalled_zero_range() start a handle independently.

This change has no practical impact now because all callers invoke these
functions within the context of an active handle. It prepares for moving
ext4_block_zero_eof() out of an active handle in the next patch, which
is a prerequisite for converting block zero range operations to iomap
infrastructure.

Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://patch.msgid.link/20260327102939.1095257-7-yi.zhang@huaweicloud.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>