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Tue, 28 Apr 2020 22:50:47 +0000 Received: from d06av21.portsmouth.uk.ibm.com (d06av21.portsmouth.uk.ibm.com [9.149.105.232]) by b06avi18878370.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 03SMojJj61538642 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 28 Apr 2020 22:50:45 GMT Received: from d06av21.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id EED7752057; Tue, 28 Apr 2020 22:50:44 +0000 (GMT) Received: from localhost.localdomain (unknown [9.145.4.15]) by d06av21.portsmouth.uk.ibm.com (Postfix) with ESMTP id 43CCC5204F; Tue, 28 Apr 2020 22:50:44 +0000 (GMT) From: Claudio Imbrenda To: akpm@linux-foundation.org, jack@suse.cz, kirill@shutemov.name Cc: borntraeger@de.ibm.com, david@redhat.com, aarcange@redhat.com, linux-mm@kvack.org, frankja@linux.ibm.com, sfr@canb.auug.org.au, jhubbard@nvidia.com, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, dave.hansen@intel.com, peterz@infradead.org, sean.j.christopherson@intel.com Subject: [PATCH v1 1/1] fs/splice: add missing callback for inaccessible pages Date: Wed, 29 Apr 2020 00:50:43 +0200 Message-Id: <20200428225043.3091359-1-imbrenda@linux.ibm.com> X-Mailer: git-send-email 2.25.4 MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138,18.0.676 definitions=2020-04-28_15:2020-04-28,2020-04-28 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 lowpriorityscore=0 clxscore=1015 mlxlogscore=968 mlxscore=0 suspectscore=0 bulkscore=0 adultscore=0 impostorscore=0 phishscore=0 spamscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2004280174 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: If a page is inaccesible and it is used for things like sendfile, then the content of the page is not always touched, and can be passed directly to a driver, causing issues. This patch fixes the issue by adding a call to arch_make_page_accessible in page_cache_pipe_buf_confirm; this fixes the issue. Fixes: f28d43636d6f ("mm/gup/writeback: add callbacks for inaccessible pa= ges") Signed-off-by: Claudio Imbrenda --- fs/splice.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/fs/splice.c b/fs/splice.c index 4735defc46ee..f026e0ce9acd 100644 --- a/fs/splice.c +++ b/fs/splice.c @@ -106,6 +106,9 @@ static int page_cache_pipe_buf_confirm(struct pipe_in= ode_info *pipe, struct page *page =3D buf->page; int err; =20 + if (arch_make_page_accessible(page)) + return -EIO; + if (!PageUptodate(page)) { lock_page(page); =20 --=20 2.25.4