ext4: refactor ext4_zero_range()

The current implementation of ext4_zero_range() contains complex
position calculations and stale error tags. To improve the code's
clarity and maintainability, it is essential to clean up the code and
improve its readability, this can be achieved by: a) simplifying and
renaming variables, making the style the same as ext4_punch_hole(); b)
eliminating unnecessary position calculations, writing back all data in
data=journal mode, and drop page cache from the original offset to the
end, rather than using aligned blocks; c) renaming the stale out_mutex
tags.

Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>
Link: https://patch.msgid.link/20241220011637.1157197-6-yi.zhang@huaweicloud.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

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