linux-ext4 - [PATCH 22/27] ext4: disable online defrag when inode using iomap buffered I/O path

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Message-ID: <20241022111059.2566137-23-yi.zhang@huaweicloud.com>
Date: Tue, 22 Oct 2024 19:10:53 +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 22/27] ext4: disable online defrag when inode using iomap buffered I/O path

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

Online defragmentation does not yet support the inode using iomap
buffered I/O path, as it still relies on ext4_get_block() to get blocks
and copy data. Therefore, we must disable it for the time being.

Signed-off-by: Zhang Yi <yi.zhang@...wei.com>
---
 fs/ext4/move_extent.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/fs/ext4/move_extent.c b/fs/ext4/move_extent.c
index b64661ea6e0e..508e342b4a1d 100644
--- a/fs/ext4/move_extent.c
+++ b/fs/ext4/move_extent.c
@@ -610,6 +610,13 @@ ext4_move_extents(struct file *o_filp, struct file *d_filp, __u64 orig_blk,
 		return -EOPNOTSUPP;
 	}
 
+	if (ext4_test_inode_state(orig_inode, EXT4_STATE_BUFFERED_IOMAP) ||
+	    ext4_test_inode_state(donor_inode, EXT4_STATE_BUFFERED_IOMAP)) {
+		ext4_msg(orig_inode->i_sb, KERN_ERR,
+			 "Online defrag not supported for inode with iomap buffered IO path");
+		return -EOPNOTSUPP;
+	}
+
 	/* Protect orig and donor inodes against a truncate */
 	lock_two_nondirectories(orig_inode, donor_inode);
 
-- 
2.46.1