[RFC PATCH 18/18] ext4: enable large folio for regular file which has been switched to use iomap

[Zhang Yi <yi.zhang@huaweicloud.com>]

From: Zhang Yi <yi.zhang@huawei.com>

After switching to use iomap for regular file in the default mode, we
can enable large foilo for it together, that could bring a lot of
performance gains.

Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
---
 fs/ext4/ialloc.c | 4 +++-
 fs/ext4/inode.c  | 4 +++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index 0aae2810dbf6..a72c7167c33f 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -1336,8 +1336,10 @@ struct inode *__ext4_new_inode(struct mnt_idmap *idmap,
 		}
 	}
 
-	if (ext4_should_use_buffered_iomap(inode))
+	if (ext4_should_use_buffered_iomap(inode)) {
 		ext4_set_inode_state(inode, EXT4_STATE_BUFFERED_IOMAP);
+		mapping_set_large_folios(inode->i_mapping);
+	}
 
 	if (ext4_handle_valid(handle)) {
 		ei->i_sync_tid = handle->h_transaction->t_tid;
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 33920dc461a8..f8801d3378e3 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -5477,8 +5477,10 @@ struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
 	if (ret)
 		goto bad_inode;
 
-	if (ext4_should_use_buffered_iomap(inode))
+	if (ext4_should_use_buffered_iomap(inode)) {
 		ext4_set_inode_state(inode, EXT4_STATE_BUFFERED_IOMAP);
+		mapping_set_large_folios(inode->i_mapping);
+	}
 
 	if (S_ISREG(inode->i_mode)) {
 		inode->i_op = &ext4_file_inode_operations;
-- 
2.39.2