From: Gao Xiang <hsiangkao@xxxxxxxxxxxxxxxxx>
[ 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@xxxxxxxxxxxxxxxxx>
Reviewed-by: Chao Yu <chao@xxxxxxxxxx>
Signed-off-by: Gao Xiang <hsiangkao@xxxxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20240306053138.2240206-1-hsiangkao@xxxxxxxxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
fs/erofs/data.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/fs/erofs/data.c b/fs/erofs/data.c
index 0c2c99c58b5e3..977bc23f96e47 100644
--- a/fs/erofs/data.c
+++ b/fs/erofs/data.c
@@ -448,5 +448,6 @@ const struct file_operations erofs_file_fops = {
.llseek = generic_file_llseek,
.read_iter = erofs_file_read_iter,
.mmap = erofs_file_mmap,
+ .get_unmapped_area = thp_get_unmapped_area,
.splice_read = filemap_splice_read,
};
--
2.43.0
