{"id":2229007,"url":"http://patchwork.ozlabs.org/api/1.1/patches/2229007/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-cifs-client/patch/20260427154639.180684-9-dhowells@redhat.com/","project":{"id":12,"url":"http://patchwork.ozlabs.org/api/1.1/projects/12/?format=json","name":"Linux CIFS Client","link_name":"linux-cifs-client","list_id":"linux-cifs.vger.kernel.org","list_email":"linux-cifs@vger.kernel.org","web_url":"","scm_url":"","webscm_url":""},"msgid":"<20260427154639.180684-9-dhowells@redhat.com>","date":"2026-04-27T15:46:23","name":"[v4,08/22] netfs: fix error handling in netfs_extract_user_iter()","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"25e23439a1dfe08509dd584c628ece8e8f0cf738","submitter":{"id":59,"url":"http://patchwork.ozlabs.org/api/1.1/people/59/?format=json","name":"David Howells","email":"dhowells@redhat.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/linux-cifs-client/patch/20260427154639.180684-9-dhowells@redhat.com/mbox/","series":[{"id":501682,"url":"http://patchwork.ozlabs.org/api/1.1/series/501682/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-cifs-client/list/?series=501682","date":"2026-04-27T15:46:15","name":"netfs: Miscellaneous fixes","version":4,"mbox":"http://patchwork.ozlabs.org/series/501682/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2229007/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2229007/checks/","tags":{},"headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-cifs@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=aw4k8kQ/;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c0a:e001:db::12fc:5321; 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c=relaxed/relaxed; d=redhat.com;\n\ts=mimecast20190719; t=1777304846;\n\th=from:from:reply-to:subject:subject:date:date:message-id:message-id:\n\t to:to:cc:cc:mime-version:mime-version:\n\t content-transfer-encoding:content-transfer-encoding:\n\t in-reply-to:in-reply-to:references:references;\n\tbh=0M8NeyGOtxqcK9n3lFvZBV03uT/fzw4I/4MxBJJ99Zo=;\n\tb=aw4k8kQ/j076bXUEQbA7JAgqUuERBETSGIINm35jJ512J92PiqQl4pjxQxozw5nl3Cl5CZ\n\t/EO9j0kZxiDhZGsTb5aruEtD5YviDv1GXXu2qE4epVR3r4TpdEDgxEeChsjX+IjS8HTAcy\n\tk6SlFvXxj0CP2QO1ulrxWr+/inV4Xzo=","X-MC-Unique":"OTI0gsoYPxydAzb8QCnzPg-1","X-Mimecast-MFC-AGG-ID":"OTI0gsoYPxydAzb8QCnzPg_1777304841","From":"David Howells ","To":"Christian Brauner ","Cc":"David Howells ,\n\tPaulo Alcantara ,\n\tnetfs@lists.linux.dev,\n\tlinux-afs@lists.infradead.org,\n\tlinux-cifs@vger.kernel.org,\n\tceph-devel@vger.kernel.org,\n\tlinux-fsdevel@vger.kernel.org,\n\tlinux-kernel@vger.kernel.org,\n\tXiaoli Feng ,\n\tstable@vger.kernel.org","Subject":"[PATCH v4 08/22] netfs: fix error handling in\n netfs_extract_user_iter()","Date":"Mon, 27 Apr 2026 16:46:23 +0100","Message-ID":"<20260427154639.180684-9-dhowells@redhat.com>","In-Reply-To":"<20260427154639.180684-1-dhowells@redhat.com>","References":"<20260427154639.180684-1-dhowells@redhat.com>","Precedence":"bulk","X-Mailing-List":"linux-cifs@vger.kernel.org","List-Id":"","List-Subscribe":"","List-Unsubscribe":"","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","X-Scanned-By":"MIMEDefang 3.0 on 10.30.177.12"},"content":"From: Paulo Alcantara \n\nIn netfs_extract_user_iter(), if iov_iter_extract_pages() failed to\nextract user pages, bail out on -ENOMEM, otherwise return the error\ncode only if @npages == 0, allowing short DIO reads and writes to be\nissued.\n\nThis fixes mmapstress02 from LTP tests against CIFS.\n\nFixes: 85dd2c8ff368 (\"netfs: Add a function to extract a UBUF or IOVEC into a BVEC iterator\")\nReported-by: Xiaoli Feng \nSigned-off-by: Paulo Alcantara (Red Hat) \nSigned-off-by: David Howells \nCc: netfs@lists.linux.dev\nCc: stable@vger.kernel.org\nCc: linux-cifs@vger.kernel.org\nCc: linux-fsdevel@vger.kernel.org\n---\n fs/netfs/iterator.c | 13 ++++++++++---\n 1 file changed, 10 insertions(+), 3 deletions(-)","diff":"diff --git a/fs/netfs/iterator.c b/fs/netfs/iterator.c\nindex 154a14bb2d7f..adca78747f23 100644\n--- a/fs/netfs/iterator.c\n+++ b/fs/netfs/iterator.c\n@@ -22,7 +22,7 @@\n *\n * Extract the page fragments from the given amount of the source iterator and\n * build up a second iterator that refers to all of those bits. This allows\n- * the original iterator to disposed of.\n+ * the original iterator to be disposed of.\n *\n * @extraction_flags can have ITER_ALLOW_P2PDMA set to request peer-to-peer DMA be\n * allowed on the pages extracted.\n@@ -67,8 +67,8 @@ ssize_t netfs_extract_user_iter(struct iov_iter *orig, size_t orig_len,\n \t\tret = iov_iter_extract_pages(orig, &pages, count,\n \t\t\t\t\t max_pages - npages, extraction_flags,\n \t\t\t\t\t &offset);\n-\t\tif (ret < 0) {\n-\t\t\tpr_err(\"Couldn't get user pages (rc=%zd)\\n\", ret);\n+\t\tif (unlikely(ret <= 0)) {\n+\t\t\tret = ret ?: -EIO;\n \t\t\tbreak;\n \t\t}\n \n@@ -97,6 +97,13 @@ ssize_t netfs_extract_user_iter(struct iov_iter *orig, size_t orig_len,\n \t\tnpages += cur_npages;\n \t}\n \n+\tif (ret < 0 && (ret == -ENOMEM || npages == 0)) {\n+\t\tfor (i = 0; i < npages; i++)\n+\t\t\tunpin_user_page(bv[i].bv_page);\n+\t\tkvfree(bv);\n+\t\treturn ret;\n+\t}\n+\n \tiov_iter_bvec(new, orig->data_source, bv, npages, orig_len - count);\n \treturn npages;\n }\n","prefixes":["v4","08/22"]}