Received-SPF: pass (google.com: domain of linux-ext4+bounces-1966-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:4601:e00::3 as permitted sender) client-ip=2604:1380:4601:e00::3;
From: Zhang Yi <yi.zhang@huaweicloud.com>
To: linux-ext4@vger.kernel.org
Cc: linux-fsdevel@vger.kernel.org,
	linux-mm@kvack.org,
	linux-kernel@vger.kernel.org,
	tytso@mit.edu,
	adilger.kernel@dilger.ca,
	jack@suse.cz,
	ritesh.list@gmail.com,
	hch@infradead.org,
	djwong@kernel.org,
	willy@infradead.org,
	zokeefe@google.com,
	yi.zhang@huawei.com,
	yi.zhang@huaweicloud.com,
	chengzhihao1@huawei.com,
	yukuai3@huawei.com,
	wangkefeng.wang@huawei.com
Subject: [RFC PATCH v4 26/34] ext4: implement mmap iomap path
Date: Wed, 10 Apr 2024 21:28:10 +0800
Message-Id: <20240410132818.2812377-27-yi.zhang@huaweicloud.com>
In-Reply-To: <20240410132818.2812377-1-yi.zhang@huaweicloud.com>
References: <20240410132818.2812377-1-yi.zhang@huaweicloud.com>
Precedence: bulk
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit

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

Add ext4_iomap_page_mkwrite() for the mmap iomap path. It dirty folio
and map blocks, almost all work have been done in iomap_page_mkwrite(),
so call it directly.

Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
---
 fs/ext4/inode.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 55a4d293177d..9d694c780007 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -6484,6 +6484,26 @@ static int ext4_bh_unmapped(handle_t *handle, struct inode *inode,
 	return !buffer_mapped(bh);
 }
 
+static vm_fault_t ext4_iomap_page_mkwrite(struct vm_fault *vmf)
+{
+	struct inode *inode = file_inode(vmf->vma->vm_file);
+	const struct iomap_ops *iomap_ops;
+
+	/*
+	 * ext4_nonda_switch() could writeback this folio, so have to
+	 * call it before lock folio.
+	 *
+	 * TODO: drop ext4_nonda_switch() after reserving enough sapce
+	 * for metadata and merge delalloc and nodelalloc operations.
+	 */
+	if (test_opt(inode->i_sb, DELALLOC) && !ext4_nonda_switch(inode->i_sb))
+		iomap_ops = &ext4_iomap_buffered_da_write_ops;
+	else
+		iomap_ops = &ext4_iomap_buffered_write_ops;
+
+	return iomap_page_mkwrite(vmf, iomap_ops);
+}
+
 vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf)
 {
 	struct vm_area_struct *vma = vmf->vma;
@@ -6507,6 +6527,11 @@ vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf)
 
 	filemap_invalidate_lock_shared(mapping);
 
+	if (ext4_test_inode_state(inode, EXT4_STATE_BUFFERED_IOMAP)) {
+		ret = ext4_iomap_page_mkwrite(vmf);
+		goto out;
+	}
+
 	err = ext4_convert_inline_data(inode);
 	if (err)
 		goto out_ret;
-- 
2.39.2