From: Andreas Gruenbacher <agruenba@redhat.com>
Date: Mon, 13 Jan 2025 18:31:28 +0000 (+0100)
Subject: gfs2: Truncate address space when flipping GFS2_DIF_JDATA flag
X-Git-Tag: v5.15.178~17
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4e3ded34f3f3c9d7ed2aac7be8cf51153646574a;p=thirdparty%2Fkernel%2Fstable.git

gfs2: Truncate address space when flipping GFS2_DIF_JDATA flag

commit 7c9d9223802fbed4dee1ae301661bf346964c9d2 upstream.

Truncate an inode's address space when flipping the GFS2_DIF_JDATA flag:
depending on that flag, the pages in the address space will either use
buffer heads or iomap_folio_state structs, and we cannot mix the two.

Reported-by: Kun Hu <huk23@m.fudan.edu.cn>, Jiaji Qin <jjtan24@m.fudan.edu.cn>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c
index e93185d804e0a..744eb526254e0 100644
--- a/fs/gfs2/file.c
+++ b/fs/gfs2/file.c
@@ -257,6 +257,7 @@ static int do_gfs2_set_flags(struct inode *inode, u32 reqflags, u32 mask,
 		error = filemap_fdatawait(inode->i_mapping);
 		if (error)
 			goto out;
+		truncate_inode_pages(inode->i_mapping, 0);
 		if (new_flags & GFS2_DIF_JDATA)
 			gfs2_ordered_del_inode(ip);
 	}