ext4: switch to using the new extent movement method

Now that we have mext_move_extent(), we can switch to this new interface
and deprecate move_extent_per_page(). First, after acquiring the
i_rwsem, we can directly use ext4_map_blocks() to obtain a contiguous
extent from the original inode as the extent to be moved. It can and
it's safe to get mapping information from the extent status tree without
needing to access the ondisk extent tree, because ext4_move_extent()
will check the sequence cookie under the folio lock. Then, after
populating the mext_data structure, we call ext4_move_extent() to move
the extent. Finally, the length of the extent will be adjusted in
mext.orig_map.m_len and the actual length moved is returned through
m_len.

Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Message-ID: <20251013015128.499308-11-yi.zhang@huaweicloud.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

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