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GET /api/1.1/patches/2229588/?format=api
{ "id": 2229588, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2229588/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-cifs-client/patch/20260428131756.922303-15-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": "<20260428131756.922303-15-dhowells@redhat.com>", "date": "2026-04-28T13:17:44", "name": "[v5,14/24] netfs: Fix potential deadlock in write-through mode", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "2273dc360369685b8f585c4f432306c9adf0d5a0", "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/20260428131756.922303-15-dhowells@redhat.com/mbox/", "series": [ { "id": 501852, "url": "http://patchwork.ozlabs.org/api/1.1/series/501852/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-cifs-client/list/?series=501852", "date": "2026-04-28T13:17:35", "name": "netfs: Miscellaneous fixes", "version": 5, "mbox": "http://patchwork.ozlabs.org/series/501852/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2229588/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2229588/checks/", "tags": {}, "headers": { "Return-Path": "\n <linux-cifs+bounces-11204-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=RZmOQk9t;\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; c=relaxed/relaxed; d=redhat.com;\n\ts=mimecast20190719; t=1777382369;\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=YHPf6hGUWYEe9rJRq40F95gNcQEzsSyVW38x9qecVoo=;\n\tb=RZmOQk9tyByspPW9EXkzT+M/WnXeldzRPq+c9Kj3IgKxYv6okAvvizfNVJgQ+U/ZyD5xKw\n\tWTjIZcWhOEXJXGDj3jy7dc+ZU3hn8u4wQvvGD2u6rcZu7c2kSOi4ZKYQq7x7ENtPoZxsNR\n\tr9N8PZ7Sxm99jUZ20dOLOZ5c0pGU99w=", "X-MC-Unique": "Rm4Xk0pOPTi4hjsMKKIbFw-1", "X-Mimecast-MFC-AGG-ID": "Rm4Xk0pOPTi4hjsMKKIbFw_1777382363", "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", "Subject": "[PATCH v5 14/24] netfs: Fix potential deadlock in write-through mode", "Date": "Tue, 28 Apr 2026 14:17:44 +0100", "Message-ID": "<20260428131756.922303-15-dhowells@redhat.com>", "In-Reply-To": "<20260428131756.922303-1-dhowells@redhat.com>", "References": "<20260428131756.922303-1-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_advance_writethrough() to always unlock the supplied folio. It's\nbeen marked for writeback and the caller is holding both inode->i_rwsem and\nictx->wb_lock, so there shouldn't be any danger of truncation, migration,\nfallocation, flushing or other I/O interfering whilst the folio is\nunlocked.\n\nNote that this may be easier to deal with once the queuing of folios is split\nfrom the generation of subrequests.\n\nFixes: 288ace2f57c9 (\"netfs: New writeback implementation\")\nCloses: https://sashiko.dev/#/patchset/20260427154639.180684-1-dhowells%40redhat.com\nSigned-off-by: David Howells <dhowells@redhat.com>\ncc: Paulo Alcantara <pc@manguebit.org>\ncc: netfs@lists.linux.dev\ncc: linux-fsdevel@vger.kernel.org\n---\n fs/netfs/write_issue.c | 8 ++++++--\n 1 file changed, 6 insertions(+), 2 deletions(-)", "diff": "diff --git a/fs/netfs/write_issue.c b/fs/netfs/write_issue.c\nindex b0e9690bb90c..0b07ebecb157 100644\n--- a/fs/netfs/write_issue.c\n+++ b/fs/netfs/write_issue.c\n@@ -665,8 +665,10 @@ int netfs_advance_writethrough(struct netfs_io_request *wreq, struct writeback_c\n \t}\n \n \twreq->len += copied;\n-\tif (!to_page_end)\n+\tif (!to_page_end) {\n+\t\tfolio_unlock(folio);\n \t\treturn 0;\n+\t}\n \n \t*writethrough_cache = NULL;\n \treturn netfs_write_folio(wreq, wbc, folio);\n@@ -683,8 +685,10 @@ ssize_t netfs_end_writethrough(struct netfs_io_request *wreq, struct writeback_c\n \n \t_enter(\"R=%x\", wreq->debug_id);\n \n-\tif (writethrough_cache)\n+\tif (writethrough_cache) {\n+\t\tfolio_lock(writethrough_cache);\n \t\tnetfs_write_folio(wreq, wbc, writethrough_cache);\n+\t}\n \n \tnetfs_end_issue_write(wreq);\n \n", "prefixes": [ "v5", "14/24" ] }