linux-ext4 - [PATCH 4/9] fuse_trace: allow local filesystems to set some VFS iflags

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Message-ID: <176169811678.1426244.3641881790453505639.stgit@frogsfrogsfrogs>
Date: Tue, 28 Oct 2025 17:54:51 -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 4/9] fuse_trace: allow local filesystems to set some VFS
 iflags

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 |   29 +++++++++++++++++++++++++++++
 fs/fuse/ioctl.c      |    7 +++++++
 2 files changed, 36 insertions(+)


diff --git a/fs/fuse/fuse_trace.h b/fs/fuse/fuse_trace.h
index 9a52f258ca3b2b..817bb6a5d3a961 100644
--- a/fs/fuse/fuse_trace.h
+++ b/fs/fuse/fuse_trace.h
@@ -176,6 +176,35 @@ TRACE_EVENT(fuse_request_end,
 		  __entry->unique, __entry->len, __entry->error)
 );
 
+DECLARE_EVENT_CLASS(fuse_fileattr_class,
+	TP_PROTO(const struct inode *inode, unsigned int old_iflags),
+
+	TP_ARGS(inode, old_iflags),
+
+	TP_STRUCT__entry(
+		FUSE_INODE_FIELDS
+		__field(unsigned int,		old_iflags)
+		__field(unsigned int,		new_iflags)
+	),
+
+	TP_fast_assign(
+		FUSE_INODE_ASSIGN(inode, fi, fm);
+		__entry->old_iflags	=	old_iflags;
+		__entry->new_iflags	=	inode->i_flags;
+	),
+
+	TP_printk(FUSE_INODE_FMT " old_iflags 0x%x iflags 0x%x",
+		  FUSE_INODE_PRINTK_ARGS,
+		  __entry->old_iflags,
+		  __entry->new_iflags)
+);
+#define DEFINE_FUSE_FILEATTR_EVENT(name)	\
+DEFINE_EVENT(fuse_fileattr_class, name,		\
+	TP_PROTO(const struct inode *inode, unsigned int old_iflags), \
+	TP_ARGS(inode, old_iflags))
+DEFINE_FUSE_FILEATTR_EVENT(fuse_fileattr_update_inode);
+DEFINE_FUSE_FILEATTR_EVENT(fuse_fileattr_init);
+
 #ifdef CONFIG_FUSE_BACKING
 #define FUSE_BACKING_FLAG_STRINGS \
 	{ FUSE_BACKING_TYPE_PASSTHROUGH,	"pass" }, \
diff --git a/fs/fuse/ioctl.c b/fs/fuse/ioctl.c
index bd2caf191ce2e0..5180066678e8c1 100644
--- a/fs/fuse/ioctl.c
+++ b/fs/fuse/ioctl.c
@@ -4,6 +4,7 @@
  */
 
 #include "fuse_i.h"
+#include "fuse_trace.h"
 
 #include <linux/uio.h>
 #include <linux/compat.h>
@@ -530,12 +531,16 @@ static void fuse_fileattr_update_inode(struct inode *inode,
 		update_iflag(inode, S_APPEND, fa->fsx_xflags & FS_XFLAG_APPEND);
 	}
 
+	trace_fuse_fileattr_update_inode(inode, old_iflags);
+
 	if (old_iflags != inode->i_flags)
 		fuse_invalidate_attr(inode);
 }
 
 void fuse_fileattr_init(struct inode *inode, const struct fuse_attr *attr)
 {
+	unsigned int old_iflags = inode->i_flags;
+
 	if (!fuse_inode_is_exclusive(inode))
 		return;
 
@@ -547,6 +552,8 @@ void fuse_fileattr_init(struct inode *inode, const struct fuse_attr *attr)
 
 	if (attr->flags & FUSE_ATTR_APPEND)
 		inode->i_flags |= S_APPEND;
+
+	trace_fuse_fileattr_init(inode, old_iflags);
 }
 
 int fuse_fileattr_get(struct dentry *dentry, struct file_kattr *fa)