linux-kernel - [PATCH 4/6] f2fs: fix the f2fs_file_write

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Message-Id: <20211116214510.2934905-4-jaegeuk@kernel.org>
Date:   Tue, 16 Nov 2021 13:45:08 -0800
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net
Cc:     Eric Biggers <ebiggers@...gle.com>,
        Jaegeuk Kim <jaegeuk@...nel.org>
Subject: [PATCH 4/6] f2fs: fix the f2fs_file_write_iter tracepoint

From: Eric Biggers <ebiggers@...gle.com>

Pass in the original position and count rather than the position and
count that were updated by the write.  Also use the correct types for
all arguments, in particular the file offset which was being truncated
to 32 bits on 32-bit platforms.

Signed-off-by: Eric Biggers <ebiggers@...gle.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
---
 fs/f2fs/file.c              |  5 +++--
 include/trace/events/f2fs.h | 12 ++++++------
 2 files changed, 9 insertions(+), 8 deletions(-)

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index fdc440d212c3..709fa893d832 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -4321,6 +4321,8 @@ static ssize_t f2fs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
 {
 	struct file *file = iocb->ki_filp;
 	struct inode *inode = file_inode(file);
+	const loff_t orig_pos = iocb->ki_pos;
+	const size_t orig_count = iov_iter_count(from);
 	loff_t target_size;
 	int preallocated;
 	ssize_t ret;
@@ -4403,8 +4405,7 @@ static ssize_t f2fs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
 out_unlock:
 	inode_unlock(inode);
 out:
-	trace_f2fs_file_write_iter(inode, iocb->ki_pos,
-					iov_iter_count(from), ret);
+	trace_f2fs_file_write_iter(inode, orig_pos, orig_count, ret);
 	if (ret > 0)
 		ret = generic_write_sync(iocb, ret);
 	return ret;
diff --git a/include/trace/events/f2fs.h b/include/trace/events/f2fs.h
index f8cb916f3595..dcb94d740e12 100644
--- a/include/trace/events/f2fs.h
+++ b/include/trace/events/f2fs.h
@@ -540,17 +540,17 @@ TRACE_EVENT(f2fs_truncate_partial_nodes,
 
 TRACE_EVENT(f2fs_file_write_iter,
 
-	TP_PROTO(struct inode *inode, unsigned long offset,
-		unsigned long length, int ret),
+	TP_PROTO(struct inode *inode, loff_t offset, size_t length,
+		 ssize_t ret),
 
 	TP_ARGS(inode, offset, length, ret),
 
 	TP_STRUCT__entry(
 		__field(dev_t,	dev)
 		__field(ino_t,	ino)
-		__field(unsigned long, offset)
-		__field(unsigned long, length)
-		__field(int,	ret)
+		__field(loff_t, offset)
+		__field(size_t, length)
+		__field(ssize_t, ret)
 	),
 
 	TP_fast_assign(
@@ -562,7 +562,7 @@ TRACE_EVENT(f2fs_file_write_iter,
 	),
 
 	TP_printk("dev = (%d,%d), ino = %lu, "
-		"offset = %lu, length = %lu, written(err) = %d",
+		"offset = %lld, length = %zu, written(err) = %zd",
 		show_dev_ino(__entry),
 		__entry->offset,
 		__entry->length,
-- 
2.34.0.rc1.387.gb447b232ab-goog