PR sync from: Yang Erkun yangerkun@huawei.com
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/MJG2WBSZZBC5XBTLEVUSWIXZLVE2Z5QI/
*** BLURB HERE ***

Yang Erkun (2):
iomap: export _iomap_write{begin|end}
ext4: fallback to generic_perform_write once iov_iter_count <=
PAGE_SIZE

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2.39.2

#I9DN5Z:【OLK-6.6】ext4文件系统buffered IO切换iomap并支持large folio