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erofs: apply proper VMA alignment for memory mapped files on THP
[ Upstream commit4127caee89
] There are mainly two reasons that thp_get_unmapped_area() should be used for EROFS as other filesystems: - It's needed to enable PMD mappings as a FSDAX filesystem, see commit74d2fad133
("thp, dax: add thp_get_unmapped_area for pmd mappings"); - It's useful together with large folios and CONFIG_READ_ONLY_THP_FOR_FS which enable THPs for mmapped files (e.g. shared libraries) even without FSDAX. See commit1854bc6e24
("mm/readahead: Align file mappings for non-DAX"). Fixes:06252e9ce0
("erofs: dax support for non-tailpacking regular file") Fixes:ce529cc25b
("erofs: enable large folios for iomap mode") Fixes:e6687b8922
("erofs: enable large folios for fscache mode") Reviewed-by: Jingbo Xu <jefflexu@linux.alibaba.com> Reviewed-by: Chao Yu <chao@kernel.org> Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com> Link: https://lore.kernel.org/r/20240306053138.2240206-1-hsiangkao@linux.alibaba.com Signed-off-by: Sasha Levin <sashal@kernel.org>
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@ -440,4 +440,5 @@ const struct file_operations erofs_file_fops = {
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.read_iter = erofs_file_read_iter,
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.mmap = erofs_file_mmap,
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.splice_read = generic_file_splice_read,
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.get_unmapped_area = thp_get_unmapped_area,
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};
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