Commit d4ec140e authored Sep 21, 2021 by Gao Xiang Committed by Greg Kroah-Hartman Sep 30, 2021

erofs: fix up erofs_lookup tracepoint

commit 93368aab0efc87288cac65e99c9ed2e0ffc9e7d0 upstream.

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

Link: https://lore.kernel.org/r/20210921143531.81356-1-hsiangkao@linux.alibaba.com


Fixes: 13f06f48 ("staging: erofs: support tracepoint")
Cc: stable@vger.kernel.org # 4.19+
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent 7751f609

include/trace/events/erofs.h

+3 −3

Original line number	Diff line number	Diff line
		@@ -35,20 +35,20 @@ TRACE_EVENT(erofs_lookup,
		TP_STRUCT__entry(
		__field(dev_t, dev )
		__field(erofs_nid_t, nid )
		__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->nid = EROFS_I(dir)->nid;
		__entry->name = dentry->d_name.name;
		__assign_str(name, dentry->d_name.name);
		__entry->flags = flags;
		),

		TP_printk("dev = (%d,%d), pnid = %llu, name:%s, flags:%x",
		show_dev_nid(__entry),
		__entry->name,
		__get_str(name),
		__entry->flags)
		);