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GET /api/1.2/patches/2234257/?format=api
{ "id": 2234257, "url": "http://patchwork.ozlabs.org/api/1.2/patches/2234257/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-cifs-client/patch/20260507134448.168602-8-rajasimandalos@gmail.com/", "project": { "id": 12, "url": "http://patchwork.ozlabs.org/api/1.2/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": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260507134448.168602-8-rajasimandalos@gmail.com>", "list_archive_url": null, "date": "2026-05-07T13:44:47", "name": "[v2,7/8] smb: client: block cache=ro and cache=singleclient on remount", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "b65fd19c5b2b5d7da07048555e88aa9c1a3190cf", "submitter": { "id": 91740, "url": "http://patchwork.ozlabs.org/api/1.2/people/91740/?format=api", "name": "RAJASI MANDAL", "email": "rajasimandalos@gmail.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linux-cifs-client/patch/20260507134448.168602-8-rajasimandalos@gmail.com/mbox/", "series": [ { "id": 503184, "url": "http://patchwork.ozlabs.org/api/1.2/series/503184/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-cifs-client/list/?series=503184", "date": "2026-05-07T13:44:40", "name": "Remount patches v2", "version": 2, "mbox": "http://patchwork.ozlabs.org/series/503184/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2234257/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2234257/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linux-cifs+bounces-11416-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 (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=T7prRjFu;\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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charset=UTF-8", "Content-Transfer-Encoding": "8bit" }, "content": "From: Rajasi Mandal <rajasimandal@microsoft.com>\n\ncache=ro and cache=singleclient are mount-time environment declarations\nwhere the admin promises that the share is read-only or exclusively\naccessed. The client bypasses server-based coherency (oplocks/leases)\nand caches aggressively based on this promise.\n\nThese modes were intentionally excluded from smb3_update_mnt_flags()\nwhen it was introduced in commit 2d39f50c2b15 (\"cifs: move update of\nflags into a separate function\") — only cache=strict, cache=none and\ncache=loose were made reconfigurable. However, remount currently\nsilently accepts cache=ro and cache=singleclient without actually\napplying them, which is confusing.\n\nAdd explicit checks in smb3_verify_reconfigure_ctx() to reject\nattempts to change these options during remount with a clear error\nmessage.\n\nSigned-off-by: Rajasi Mandal <rajasimandal@microsoft.com>\n---\n fs/smb/client/fs_context.c | 9 +++++++++\n 1 file changed, 9 insertions(+)", "diff": "diff --git a/fs/smb/client/fs_context.c b/fs/smb/client/fs_context.c\nindex 01c57adb0ef1..009b9480b5cc 100644\n--- a/fs/smb/client/fs_context.c\n+++ b/fs/smb/client/fs_context.c\n@@ -1207,6 +1207,15 @@ static int smb3_verify_reconfigure_ctx(struct fs_context *fc,\n \t\tcifs_errorf(fc, \"can not change rdma during remount\\n\");\n \t\treturn -EINVAL;\n \t}\n+\t/* init default: cache_ro = false, cache_rw = false (i.e. cache=strict) */\n+\tif (new_ctx->cache_ro != old_ctx->cache_ro) {\n+\t\tcifs_errorf(fc, \"can not change cache=ro during remount\\n\");\n+\t\treturn -EINVAL;\n+\t}\n+\tif (new_ctx->cache_rw != old_ctx->cache_rw) {\n+\t\tcifs_errorf(fc, \"can not change cache=singleclient during remount\\n\");\n+\t\treturn -EINVAL;\n+\t}\n \n \treturn 0;\n }\n", "prefixes": [ "v2", "7/8" ] }