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netfs: Fix the netfs_folio tracepoint to handle NULL mapping

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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: c38f4e96e6 ("netfs: Provide func to copy data to pagecache for buffered write")
Signed-off-by: David Howells <dhowells@redhat.com>
Link: https://lore.kernel.org/r/2917423.1727697556@warthog.procyon.org.uk
cc: Jeff Layton <jlayton@kernel.org>
cc: netfs@lists.linux.dev
cc: linux-fsdevel@vger.kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
David Howells 2024-09-30 12:59:16 +01:00 committed by Christian Brauner
parent 28e8c5c095
commit f801850bc2
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1 changed files with 2 additions and 1 deletions
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3
include/trace/events/netfs.h
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@ -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);