linux-kernel - [PATCH -next v2 19/22] ext4: add block mapping tracepoints for iomap buffered I/O path

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Message-ID: <20260203062523.3869120-20-yi.zhang@huawei.com>
Date: Tue,  3 Feb 2026 14:25:19 +0800
From: Zhang Yi <yi.zhang@...wei.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,
	ojaswin@...ux.ibm.com,
	ritesh.list@...il.com,
	hch@...radead.org,
	djwong@...nel.org,
	yi.zhang@...wei.com,
	yi.zhang@...weicloud.com,
	yizhang089@...il.com,
	libaokun1@...wei.com,
	yangerkun@...wei.com,
	yukuai@...as.com
Subject: [PATCH -next v2 19/22] ext4: add block mapping tracepoints for iomap buffered I/O path

Add tracepoints for iomap buffered read, write, partial block zeroing
and writeback operations.

Signed-off-by: Zhang Yi <yi.zhang@...wei.com>
---
 fs/ext4/inode.c             |  6 +++++
 include/trace/events/ext4.h | 45 +++++++++++++++++++++++++++++++++++++
 2 files changed, 51 insertions(+)

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index c59f3adba0f3..77dcca584153 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3956,6 +3956,8 @@ static int ext4_iomap_buffered_read_begin(struct inode *inode, loff_t offset,
 	if (ret < 0)
 		return ret;
 
+	trace_ext4_iomap_buffered_read_begin(inode, &map, offset, length,
+					     flags);
 	ext4_set_iomap(inode, iomap, &map, offset, length, flags);
 	return 0;
 }
@@ -4040,6 +4042,8 @@ static int ext4_iomap_buffered_do_write_begin(struct inode *inode,
 	if (ret < 0)
 		return ret;
 
+	trace_ext4_iomap_buffered_write_begin(inode, &map, offset, length,
+					      flags);
 	ext4_set_iomap(inode, iomap, &map, offset, length, flags);
 	return 0;
 }
@@ -4142,6 +4146,7 @@ static int ext4_iomap_zero_begin(struct inode *inode,
 			map.m_len = (offset >> blkbits) - map.m_lblk;
 	}
 
+	trace_ext4_iomap_zero_begin(inode, &map, offset, length, flags);
 	ext4_set_iomap(inode, iomap, &map, offset, length, flags);
 	iomap->flags |= iomap_flags;
 
@@ -4319,6 +4324,7 @@ static int ext4_iomap_map_writeback_range(struct iomap_writepage_ctx *wpc,
 	}
 out:
 	ewpc->data_seq = map.m_seq;
+	trace_ext4_iomap_map_writeback_range(inode, &map, offset, dirty_len, 0);
 	ext4_set_iomap(inode, &wpc->iomap, &map, offset, dirty_len, 0);
 	return 0;
 }
diff --git a/include/trace/events/ext4.h b/include/trace/events/ext4.h
index a3e8fe414df8..1922df4190e7 100644
--- a/include/trace/events/ext4.h
+++ b/include/trace/events/ext4.h
@@ -3096,6 +3096,51 @@ TRACE_EVENT(ext4_move_extent_exit,
 		  __entry->ret)
 );
 
+DECLARE_EVENT_CLASS(ext4_set_iomap_class,
+	TP_PROTO(struct inode *inode, struct ext4_map_blocks *map,
+		 loff_t offset, loff_t length, unsigned int flags),
+	TP_ARGS(inode, map, offset, length, flags),
+	TP_STRUCT__entry(
+		__field(dev_t, dev)
+		__field(ino_t, ino)
+		__field(ext4_lblk_t, m_lblk)
+		__field(unsigned int, m_len)
+		__field(unsigned int, m_flags)
+		__field(u64, m_seq)
+		__field(loff_t, offset)
+		__field(loff_t, length)
+		__field(unsigned int, iomap_flags)
+	),
+	TP_fast_assign(
+		__entry->dev		= inode->i_sb->s_dev;
+		__entry->ino		= inode->i_ino;
+		__entry->m_lblk		= map->m_lblk;
+		__entry->m_len		= map->m_len;
+		__entry->m_flags	= map->m_flags;
+		__entry->m_seq		= map->m_seq;
+		__entry->offset		= offset;
+		__entry->length		= length;
+		__entry->iomap_flags	= flags;
+
+	),
+	TP_printk("dev %d:%d ino %lu m_lblk %u m_len %u m_flags %s m_seq %llu orig_off 0x%llx orig_len 0x%llx iomap_flags 0x%x",
+		  MAJOR(__entry->dev), MINOR(__entry->dev),
+		  __entry->ino, __entry->m_lblk, __entry->m_len,
+		  show_mflags(__entry->m_flags), __entry->m_seq,
+		  __entry->offset, __entry->length, __entry->iomap_flags)
+)
+
+#define DEFINE_SET_IOMAP_EVENT(name) \
+DEFINE_EVENT(ext4_set_iomap_class, name, \
+	TP_PROTO(struct inode *inode, struct ext4_map_blocks *map, \
+		 loff_t offset, loff_t length, unsigned int flags), \
+	TP_ARGS(inode, map, offset, length, flags))
+
+DEFINE_SET_IOMAP_EVENT(ext4_iomap_buffered_read_begin);
+DEFINE_SET_IOMAP_EVENT(ext4_iomap_buffered_write_begin);
+DEFINE_SET_IOMAP_EVENT(ext4_iomap_map_writeback_range);
+DEFINE_SET_IOMAP_EVENT(ext4_iomap_zero_begin);
+
 #endif /* _TRACE_EXT4_H */
 
 /* This part must be outside protection */
-- 
2.52.0