From: Gao Xiang hsiangkao@linux.alibaba.com
[ Upstream commit 4127caee89612a84adedd78c9453089138cd5afe ]
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 commit 74d2fad1334d ("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 commit 1854bc6e2420 ("mm/readahead: Align file mappings for non-DAX").
Fixes: 06252e9ce05b ("erofs: dax support for non-tailpacking regular file") Fixes: ce529cc25b18 ("erofs: enable large folios for iomap mode") Fixes: e6687b89225e ("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.c... Signed-off-by: Sasha Levin sashal@kernel.org --- fs/erofs/data.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/fs/erofs/data.c b/fs/erofs/data.c index 16a41d0db55a3..a859bf0f31df2 100644 --- a/fs/erofs/data.c +++ b/fs/erofs/data.c @@ -340,4 +340,5 @@ const struct file_operations erofs_file_fops = { .read_iter = erofs_file_read_iter, .mmap = erofs_file_mmap, .splice_read = generic_file_splice_read, + .get_unmapped_area = thp_get_unmapped_area, };