linux-ext4 - [PATCH v2 03/18] fsdax: Include unmapped inodes for page-idle detection

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Date:   Thu, 15 Sep 2022 20:35:27 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     akpm@...ux-foundation.org
Cc:     Matthew Wilcox <willy@...radead.org>, Jan Kara <jack@...e.cz>,
        "Darrick J. Wong" <djwong@...nel.org>,
        Jason Gunthorpe <jgg@...dia.com>,
        Christoph Hellwig <hch@....de>,
        John Hubbard <jhubbard@...dia.com>,
        linux-fsdevel@...r.kernel.org, nvdimm@...ts.linux.dev,
        linux-xfs@...r.kernel.org, linux-mm@...ck.org,
        linux-ext4@...r.kernel.org
Subject: [PATCH v2 03/18] fsdax: Include unmapped inodes for page-idle
 detection

A page can remain pinned even after it has been unmapped from userspace
/ removed from the rmap. In advance of requiring that all
dax_insert_entry() events are followed up 'break layouts' before a
truncate event, make sure that 'break layouts' can find unmapped
entries.

Cc: Matthew Wilcox <willy@...radead.org>
Cc: Jan Kara <jack@...e.cz>
Cc: "Darrick J. Wong" <djwong@...nel.org>
Cc: Jason Gunthorpe <jgg@...dia.com>
Cc: Christoph Hellwig <hch@....de>
Cc: John Hubbard <jhubbard@...dia.com>
Signed-off-by: Dan Williams <dan.j.williams@...el.com>
---
 fs/dax.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/dax.c b/fs/dax.c
index e762b9c04fb4..76bad1c095c0 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -698,7 +698,7 @@ struct page *dax_layout_busy_page_range(struct address_space *mapping,
 	if (IS_ENABLED(CONFIG_FS_DAX_LIMITED))
 		return NULL;
 
-	if (!dax_mapping(mapping) || !mapping_mapped(mapping))
+	if (!dax_mapping(mapping))
 		return NULL;
 
 	/* If end == LLONG_MAX, all pages from start to till end of file */