linux-kernel - [PATCH 18/27] ext4: implement mmap iomap path

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Message-ID: <20241022111059.2566137-19-yi.zhang@huaweicloud.com>
Date: Tue, 22 Oct 2024 19:10:49 +0800
From: Zhang Yi <yi.zhang@...weicloud.com>
To: linux-ext4@...r.kernel.org
Cc: linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	tytso@....edu,
	adilger.kernel@...ger.ca,
	jack@...e.cz,
	ritesh.list@...il.com,
	hch@...radead.org,
	djwong@...nel.org,
	david@...morbit.com,
	zokeefe@...gle.com,
	yi.zhang@...wei.com,
	yi.zhang@...weicloud.com,
	chengzhihao1@...wei.com,
	yukuai3@...wei.com,
	yangerkun@...wei.com
Subject: [PATCH 18/27] ext4: implement mmap iomap path

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

Introduce ext4_iomap_page_mkwrite() to implement the mmap iomap path. It
invoke iomap_page_mkwrite() and passes
ext4_iomap_buffered_[da_]write_ops to make the folio dirty and map
blocks, Almost all other work are handled by iomap_page_mkwrite().

Signed-off-by: Zhang Yi <yi.zhang@...wei.com>
---
 fs/ext4/inode.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index a260942fd2dd..0a9b73534257 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -6478,6 +6478,23 @@ 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.
+	 */
+	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;
@@ -6501,6 +6518,11 @@ 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;
-- 
2.46.1