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Registered in England and Wales under Company Registration No. 3798903 From: David Howells To: Jens Axboe , David Hildenbrand , kernel test robot cc: dhowells@redhat.com, Christoph Hellwig , Andrew Morton , Al Viro , Matthew Wilcox , Jan Kara , Jeff Layton , Jason Gunthorpe , Logan Gunthorpe , Hillf Danton , Christian Brauner , Lorenzo Stoakes , linux-fsdevel@vger.kernel.org, linux-block@vger.kernel.org, linux-mm@kvack.org, oe-lkp@lists.linux.dev, lkp@intel.com, linux-kernel@vger.kernel.org Subject: [PATCH] block: Fix dio_bio_alloc() to set BIO_PAGE_PINNED MIME-Version: 1.0 Content-ID: <431928.1686588681.1@warthog.procyon.org.uk> Date: Mon, 12 Jun 2023 17:51:21 +0100 Message-ID: <431929.1686588681@warthog.procyon.org.uk> X-Scanned-By: MIMEDefang 3.1 on 10.11.54.4 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_NONE,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1768518113192334131?= X-GMAIL-MSGID: =?utf-8?q?1768518113192334131?= Fix dio_bio_alloc() to set BIO_PAGE_PINNED, not BIO_PAGE_REFFED, so that the bio code unpins the pinned pages rather than putting a ref on them. The issue was causing: WARNING: CPU: 6 PID: 2220 at mm/gup.c:76 try_get_folio This can be caused by creating a file on a loopback UDF filesystem, opening it O_DIRECT and making two writes to it from the same source buffer. Fixes: 1ccf164ec866 ("block: Use iov_iter_extract_pages() and page pinning in direct-io.c") Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-lkp/202306120931.a9606b88-oliver.sang@intel.com Signed-off-by: David Howells cc: Christoph Hellwig cc: David Hildenbrand cc: Andrew Morton cc: Jens Axboe cc: Al Viro cc: Matthew Wilcox cc: Jan Kara cc: Jeff Layton cc: Jason Gunthorpe cc: Logan Gunthorpe cc: Hillf Danton cc: Christian Brauner cc: Linus Torvalds cc: linux-fsdevel@vger.kernel.org cc: linux-block@vger.kernel.org cc: linux-kernel@vger.kernel.org cc: linux-mm@kvack.org --- fs/direct-io.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/fs/direct-io.c b/fs/direct-io.c index 14049204cac8..04e810826ee8 100644 --- a/fs/direct-io.c +++ b/fs/direct-io.c @@ -415,7 +415,8 @@ dio_bio_alloc(struct dio *dio, struct dio_submit *sdio, else bio->bi_end_io = dio_bio_end_io; /* for now require references for all pages */ - bio_set_flag(bio, BIO_PAGE_REFFED); + if (dio->need_unpin) + bio_set_flag(bio, BIO_PAGE_PINNED); sdio->bio = bio; sdio->logical_offset_in_bio = sdio->cur_page_fs_offset; }