From: David Howells Date: Mon, 30 Sep 2024 11:59:16 +0000 (+0100) Subject: netfs: Fix the netfs_folio tracepoint to handle NULL mapping X-Git-Tag: microblaze-v6.16~969^2 X-Git-Url: http://git.monstr.eu/?a=commitdiff_plain;h=f801850bc263d7fa0a4e6d9a36cddf4966c79c14;p=linux-2.6-microblaze.git netfs: Fix the netfs_folio tracepoint to handle NULL mapping Fix the netfs_folio tracepoint to handle folios that have a NULL mapping pointer. In such a case, just substitute a zero inode number. Fixes: c38f4e96e605 ("netfs: Provide func to copy data to pagecache for buffered write") Signed-off-by: David Howells Link: https://lore.kernel.org/r/2917423.1727697556@warthog.procyon.org.uk cc: Jeff Layton cc: netfs@lists.linux.dev cc: linux-fsdevel@vger.kernel.org Signed-off-by: Christian Brauner --- diff --git a/include/trace/events/netfs.h b/include/trace/events/netfs.h index 76bd42a96815..1d7c52821e55 100644 --- a/include/trace/events/netfs.h +++ b/include/trace/events/netfs.h @@ -448,7 +448,8 @@ TRACE_EVENT(netfs_folio, ), TP_fast_assign( - __entry->ino = folio->mapping->host->i_ino; + struct address_space *__m = READ_ONCE(folio->mapping); + __entry->ino = __m ? __m->host->i_ino : 0; __entry->why = why; __entry->index = folio_index(folio); __entry->nr = folio_nr_pages(folio);