[PATCH 5.15 082/279] f2fs: fix up f2fs_lookup tracepoints

Greg Kroah-Hartman
2021-11-24T13:51:24Z

From: Gao Xiang <hsiangkao@linux.alibaba.com>

[ Upstream commit 70a9ac36ffd807ac506ed0b849f3e8ce3c6623f2 ]

Fix up a misuse that the filename pointer isn't always valid in
the ring buffer, and we should copy the content instead.

Fixes: 0c5e36db17f5 ("f2fs: trace f2fs_lookup")
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
include/trace/events/f2fs.h | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/include/trace/events/f2fs.h b/include/trace/events/f2fs.h
index 4e881d91c8744..4cb055af1ec0b 100644
--- a/include/trace/events/f2fs.h
+++ b/include/trace/events/f2fs.h
@@ -807,20 +807,20 @@ TRACE_EVENT(f2fs_lookup_start,
TP_STRUCT__entry(
__field(dev_t, dev)
__field(ino_t, ino)
- __field(const char *, name)
+ __string(name, dentry->d_name.name)
__field(unsigned int, flags)
),

TP_fast_assign(
__entry->dev = dir->i_sb->s_dev;
__entry->ino = dir->i_ino;
- __entry->name = dentry->d_name.name;
+ __assign_str(name, dentry->d_name.name);
__entry->flags = flags;
),

TP_printk("dev = (%d,%d), pino = %lu, name:%s, flags:%u",
show_dev_ino(__entry),
- __entry->name,
+ __get_str(name),
__entry->flags)
);

@@ -834,7 +834,7 @@ TRACE_EVENT(f2fs_lookup_end,
TP_STRUCT__entry(
__field(dev_t, dev)
__field(ino_t, ino)
- __field(const char *, name)
+ __string(name, dentry->d_name.name)
__field(nid_t, cino)
__field(int, err)
),
@@ -842,14 +842,14 @@ TRACE_EVENT(f2fs_lookup_end,
TP_fast_assign(
__entry->dev = dir->i_sb->s_dev;
__entry->ino = dir->i_ino;
- __entry->name = dentry->d_name.name;
+ __assign_str(name, dentry->d_name.name);
__entry->cino = ino;
__entry->err = err;
),

TP_printk("dev = (%d,%d), pino = %lu, name:%s, ino:%u, err:%d",
show_dev_ino(__entry),
- __entry->name,
+ __get_str(name),
__entry->cino,
__entry->err)
);
--
2.33.0