linux-ext4 - [PATCH 11/31] fuse_trace: implement basic iomap reporting such as FIEMAP and SEEK

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Message-ID: <176169810591.1424854.7337339383077106776.stgit@frogsfrogsfrogs>
Date: Tue, 28 Oct 2025 17:47:49 -0700
From: "Darrick J. Wong" <djwong@...nel.org>
To: djwong@...nel.org, miklos@...redi.hu
Cc: joannelkoong@...il.com, bernd@...ernd.com, neal@...pa.dev,
 linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: [PATCH 11/31] fuse_trace: implement basic iomap reporting such as
 FIEMAP and SEEK_{DATA,HOLE}

From: Darrick J. Wong <djwong@...nel.org>

Add tracepoints for the previous patch.

Signed-off-by: "Darrick J. Wong" <djwong@...nel.org>
---
 fs/fuse/fuse_trace.h |   46 ++++++++++++++++++++++++++++++++++++++++++++++
 fs/fuse/file_iomap.c |    4 ++++
 2 files changed, 50 insertions(+)


diff --git a/fs/fuse/fuse_trace.h b/fs/fuse/fuse_trace.h
index fac981e2a30df0..730ab8bce44450 100644
--- a/fs/fuse/fuse_trace.h
+++ b/fs/fuse/fuse_trace.h
@@ -532,6 +532,52 @@ DEFINE_EVENT(fuse_inode_state_class, name,	\
 	TP_ARGS(inode))
 DEFINE_FUSE_INODE_STATE_EVENT(fuse_iomap_init_inode);
 DEFINE_FUSE_INODE_STATE_EVENT(fuse_iomap_evict_inode);
+
+TRACE_EVENT(fuse_iomap_fiemap,
+	TP_PROTO(const struct inode *inode, u64 start, u64 count,
+		unsigned int flags),
+
+	TP_ARGS(inode, start, count, flags),
+
+	TP_STRUCT__entry(
+		FUSE_IO_RANGE_FIELDS()
+		__field(unsigned int,		flags)
+	),
+
+	TP_fast_assign(
+		FUSE_INODE_ASSIGN(inode, fi, fm);
+		__entry->offset		=	start;
+		__entry->length		=	count;
+		__entry->flags		=	flags;
+	),
+
+	TP_printk(FUSE_IO_RANGE_FMT("fiemap") " flags 0x%x",
+		  FUSE_IO_RANGE_PRINTK_ARGS(),
+		  __entry->flags)
+);
+
+TRACE_EVENT(fuse_iomap_lseek,
+	TP_PROTO(const struct inode *inode, loff_t offset, int whence),
+
+	TP_ARGS(inode, offset, whence),
+
+	TP_STRUCT__entry(
+		FUSE_INODE_FIELDS
+		__field(loff_t,			offset)
+		__field(int,			whence)
+	),
+
+	TP_fast_assign(
+		FUSE_INODE_ASSIGN(inode, fi, fm);
+		__entry->offset		=	offset;
+		__entry->whence		=	whence;
+	),
+
+	TP_printk(FUSE_INODE_FMT " offset 0x%llx whence %d",
+		  FUSE_INODE_PRINTK_ARGS,
+		  __entry->offset,
+		  __entry->whence)
+);
 #endif /* CONFIG_FUSE_IOMAP */
 
 #endif /* _TRACE_FUSE_H */
diff --git a/fs/fuse/file_iomap.c b/fs/fuse/file_iomap.c
index ce64e7c4860ef8..c63527cec0448b 100644
--- a/fs/fuse/file_iomap.c
+++ b/fs/fuse/file_iomap.c
@@ -714,6 +714,8 @@ int fuse_iomap_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 	if (!fuse_allow_current_process(fc))
 		return -EACCES;
 
+	trace_fuse_iomap_fiemap(inode, start, count, fieinfo->fi_flags);
+
 	inode_lock_shared(inode);
 	error = iomap_fiemap(inode, fieinfo, start, count, &fuse_iomap_ops);
 	inode_unlock_shared(inode);
@@ -741,6 +743,8 @@ loff_t fuse_iomap_lseek(struct file *file, loff_t offset, int whence)
 	if (!fuse_allow_current_process(fc))
 		return -EACCES;
 
+	trace_fuse_iomap_lseek(inode, offset, whence);
+
 	switch (whence) {
 	case SEEK_HOLE:
 		offset = iomap_seek_hole(inode, offset, &fuse_iomap_ops);