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erofs: fix up erofs_lookup tracepoint

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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: 13f06f48f7 ("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>
This commit is contained in:
Gao Xiang
2021-09-21 22:35:30 +08:00
committed by Greg Kroah-Hartman
parent 91e4ad05bf
commit 8326be9e51
1 changed files with 3 additions and 3 deletions
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6
include/trace/events/erofs.h
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@@ -35,20 +35,20 @@ TRACE_EVENT(erofs_lookup,
TP_STRUCT__entry( TP_STRUCT__entry(
__field(dev_t, dev ) __field(dev_t, dev )
__field(erofs_nid_t, nid ) __field(erofs_nid_t, nid )
__field(const char *, name ) __string(name, dentry->d_name.name )
__field(unsigned int, flags ) __field(unsigned int, flags )
), ),
TP_fast_assign( TP_fast_assign(
__entry->dev = dir->i_sb->s_dev; __entry->dev = dir->i_sb->s_dev;
__entry->nid = EROFS_I(dir)->nid; __entry->nid = EROFS_I(dir)->nid;
__entry->name = dentry->d_name.name; __assign_str(name, dentry->d_name.name);
__entry->flags = flags; __entry->flags = flags;
), ),
TP_printk("dev = (%d,%d), pnid = %llu, name:%s, flags:%x", TP_printk("dev = (%d,%d), pnid = %llu, name:%s, flags:%x",
show_dev_nid(__entry), show_dev_nid(__entry),
__entry->name, __get_str(name),
__entry->flags) __entry->flags)
); );