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GET /api/1.1/patches/2229012/?format=api
{ "id": 2229012, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2229012/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-cifs-client/patch/20260427154639.180684-22-dhowells@redhat.com/", "project": { "id": 12, "url": "http://patchwork.ozlabs.org/api/1.1/projects/12/?format=api", "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": "<20260427154639.180684-22-dhowells@redhat.com>", "date": "2026-04-27T15:46:36", "name": "[v4,21/22] netfs, afs: Fix write skipping in dir/link writepages", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "7d0ac314a0b9a4e189f0901dcda18dcfb3afc4e9", "submitter": { "id": 59, "url": "http://patchwork.ozlabs.org/api/1.1/people/59/?format=api", "name": "David Howells", "email": "dhowells@redhat.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linux-cifs-client/patch/20260427154639.180684-22-dhowells@redhat.com/mbox/", "series": [ { "id": 501682, "url": "http://patchwork.ozlabs.org/api/1.1/series/501682/?format=api", "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/2229012/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2229012/checks/", "tags": {}, "headers": { "Return-Path": "\n <linux-cifs+bounces-11177-incoming=patchwork.ozlabs.org@vger.kernel.org>", "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=bgxWJDTP;\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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a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116;\n\tt=1777304910; cv=none;\n b=OLE9jXybmwx5rQ4XK0FRiYV5QB7Cv7PduPnH7mPy18qpAmbHoVIMKpFbT+NRZYpmhU1LxDJ615DMwm1JhDnZpEWS9jEx65GCa/4Emv+od0/PvqSd5pPc+TutDQtCpJCllbnqkRJH5lu7JdogaYXvNWMXlRUTpRxnKji9I4oghyQ=", "ARC-Message-Signature": "i=1; a=rsa-sha256; d=subspace.kernel.org;\n\ts=arc-20240116; t=1777304910; c=relaxed/simple;\n\tbh=c5oDArXQJh7y60M1cLms/vcgi7TX/3O0SYtvfxSNmhk=;\n\th=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References:\n\t MIME-Version;\n b=aB6F+Yxm+4mZswlwiEZEeUD99fCGLwefzPTTR2H3yloswGMtN4p7YymVVEGP1bOvTL266eFNId7JKWKnLCHQ/ULYco0pKx42pKVcv1Tm+olB5lbvnnGGv0mZ3cC96fpCUTxA1Zee2G8UDIgi6aBx9Bbwy2cZw9unRzqR44JG5vI=", "ARC-Authentication-Results": "i=1; smtp.subspace.kernel.org;\n dmarc=pass (p=quarantine dis=none) header.from=redhat.com;\n spf=pass smtp.mailfrom=redhat.com;\n dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com\n header.b=bgxWJDTP; arc=none smtp.client-ip=170.10.129.124", "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com;\n\ts=mimecast20190719; t=1777304908;\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=QS/xrleH5AOpAKSiASxQWMXbrc7cAq+mCszoPIawfWE=;\n\tb=bgxWJDTPMESklPqNtXQBQ1JsbTgM9n8EudZXAi4+4FgmOdbTz/AllzeMO9hbe3HIQoj6uX\n\tkIoVxc2Ntaxq5MKDQEvL2N+zDX5Y8EoL7g0YhcekSOrks0SKbBcDHKasT0RI6e7ExDqOHE\n\tlJGQKWZ62bnbJ624I6DUx5iXwiIhntg=", "X-MC-Unique": "BivbckB5P8qzrdjjQiZmnA-1", "X-Mimecast-MFC-AGG-ID": "BivbckB5P8qzrdjjQiZmnA_1777304903", "From": "David Howells <dhowells@redhat.com>", "To": "Christian Brauner <christian@brauner.io>", "Cc": "David Howells <dhowells@redhat.com>,\n\tPaulo Alcantara <pc@manguebit.org>,\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\tMarc Dionne <marc.dionne@auristor.com>", "Subject": "[PATCH v4 21/22] netfs,\n afs: Fix write skipping in dir/link writepages", "Date": "Mon, 27 Apr 2026 16:46:36 +0100", "Message-ID": "<20260427154639.180684-22-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": "<linux-cifs.vger.kernel.org>", "List-Subscribe": "<mailto:linux-cifs+subscribe@vger.kernel.org>", "List-Unsubscribe": "<mailto:linux-cifs+unsubscribe@vger.kernel.org>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "X-Scanned-By": "MIMEDefang 3.4.1 on 10.30.177.93" }, "content": "Fix netfs_write_single() and afs_single_writepages() to better handle a\nwrite that would be skipped due to lock contention and WB_SYNC_NONE by\nreturning 1 from netfs_write_single() if it skipped and making\nafs_single_writepages() skip also.\n\nThis is really only theoretical for directories in netfs_write_single() as\nthe only path to that is through afs_single_writepages() that takes the\n->validate_lock around it, thereby serialising it.\n\nFixes: 6dd80936618c (\"afs: Use netfslib for directories\")\nSigned-off-by: David Howells <dhowells@redhat.com>\ncc: Marc Dionne <marc.dionne@auristor.com>\ncc: linux-afs@lists.infradead.org\ncc: linux-fsdevel@vger.kernel.org\n---\n fs/afs/dir.c | 8 +++++++-\n fs/netfs/write_issue.c | 5 ++++-\n 2 files changed, 11 insertions(+), 2 deletions(-)", "diff": "diff --git a/fs/afs/dir.c b/fs/afs/dir.c\nindex aaaa55878ffd..3379d01c72fb 100644\n--- a/fs/afs/dir.c\n+++ b/fs/afs/dir.c\n@@ -2206,7 +2206,11 @@ int afs_single_writepages(struct address_space *mapping,\n \t/* Need to lock to prevent the folio queue and folios from being thrown\n \t * away.\n \t */\n-\tdown_read(&dvnode->validate_lock);\n+\tif (!down_read_trylock(&dvnode->validate_lock)) {\n+\t\tif (wbc->sync_mode == WB_SYNC_NONE)\n+\t\t\treturn 0;\n+\t\tdown_read(&dvnode->validate_lock);\n+\t}\n \n \tif (is_dir ?\n \t test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) :\n@@ -2214,6 +2218,8 @@ int afs_single_writepages(struct address_space *mapping,\n \t\tiov_iter_folio_queue(&iter, ITER_SOURCE, dvnode->directory, 0, 0,\n \t\t\t\t i_size_read(&dvnode->netfs.inode));\n \t\tret = netfs_writeback_single(mapping, wbc, &iter);\n+\t\tif (ret == 1)\n+\t\t\tret = 0; /* Skipped write due to lock conflict. */\n \t}\n \n \tup_read(&dvnode->validate_lock);\ndiff --git a/fs/netfs/write_issue.c b/fs/netfs/write_issue.c\nindex b0e9690bb90c..60525cf6e679 100644\n--- a/fs/netfs/write_issue.c\n+++ b/fs/netfs/write_issue.c\n@@ -819,6 +819,9 @@ static int netfs_write_folio_single(struct netfs_io_request *wreq,\n *\n * Write a monolithic, non-pagecache object back to the server and/or\n * the cache.\n+ *\n+ * Return: 0 if successful; 1 if skipped due to lock conflict and WB_SYNC_NONE;\n+ * or a negative error code.\n */\n int netfs_writeback_single(struct address_space *mapping,\n \t\t\t struct writeback_control *wbc,\n@@ -836,7 +839,7 @@ int netfs_writeback_single(struct address_space *mapping,\n \tif (!mutex_trylock(&ictx->wb_lock)) {\n \t\tif (wbc->sync_mode == WB_SYNC_NONE) {\n \t\t\tnetfs_stat(&netfs_n_wb_lock_skip);\n-\t\t\treturn 0;\n+\t\t\treturn 1;\n \t\t}\n \t\tnetfs_stat(&netfs_n_wb_lock_wait);\n \t\tmutex_lock(&ictx->wb_lock);\n", "prefixes": [ "v4", "21/22" ] }