From patchwork Mon Aug 26 12:46:15 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeff Layton X-Patchwork-Id: 13777854 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id F1B87198E6D; Mon, 26 Aug 2024 12:46:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724676406; cv=none; b=hAdUwelPMUnq/dVQBUNaBCWOcN5Zv4KPwjzeb3DZuXSVWdZeF3rlSPAzBZRaFRnWcfIixxWIqgSq0JUjpBlHrRoQlSztCw1Y8OquUZgUaDW+7/luYnqTTLpSJMOVGS2sExKLJfMyqxFUVOMr00MUq/DzlzpAlnjl61jDEnci2gs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724676406; c=relaxed/simple; bh=PSgvoG/VeBHlNw/xybnGmp2VjTgkoJJ22Of1xt8QDDI=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=N5rOb85OVnx7uAsA6JQvJMrqvd15m5hLPpFiRciH2JnciyPsbWdEesd6AyQaKDAOYMNsP7xL1gvhi6iraoHfyV9+oB6Mjs0b3a9hgloP0KCaMtboNosNFY2PU+0Gv7HsaQhLzTu644JAObvUKX9l18OjSx7KYdKbybwlmwfxcjc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=vJLtM6BS; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="vJLtM6BS" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5E6D6C58282; Mon, 26 Aug 2024 12:46:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1724676405; bh=PSgvoG/VeBHlNw/xybnGmp2VjTgkoJJ22Of1xt8QDDI=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=vJLtM6BSBsNCn020oOq8TSo8GFLvfaEQje9ZWWH76s3srFqLSu6w64Q+F+/r5aNuP 3tBpK3GUXt2xcD6EPn8fXDMOgkpE4h6mbjV9WopISOtc5iICVtzvvqqmnKjy7/MZHV zVP3D3NfKQgppfS7sdQgi+sHK6uRXUBZU6H/GgOP1p/Cl4q/2NpJBO5IoFV40r4Gjs iBIssJHdlqK6RHa7mJqPvQUED+YTphTqU0hVYyWmWHGzFQw3qYNSApV6A10WcNNVGX /Xm9n707OJBYqADZQdFMthFMb2eB7v7r0I3gEDi2snqtuxKaPp3jdpCgSXyvLblSWb fwKqlD1VLD59Q== From: Jeff Layton Date: Mon, 26 Aug 2024 08:46:15 -0400 Subject: [PATCH v2 5/7] fs: add an ATTR_CTIME_DLG flag Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240826-delstid-v2-5-e8ab5c0e39cc@kernel.org> References: <20240826-delstid-v2-0-e8ab5c0e39cc@kernel.org> In-Reply-To: <20240826-delstid-v2-0-e8ab5c0e39cc@kernel.org> To: Chuck Lever , Neil Brown , Olga Kornievskaia , Dai Ngo , Tom Talpey , Trond Myklebust , Anna Schumaker , Olga Kornievskaia , Alexander Viro , Christian Brauner , Jan Kara , Jonathan Corbet Cc: Tom Haynes , linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-doc@vger.kernel.org, Jeff Layton X-Mailer: b4 0.14.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2163; i=jlayton@kernel.org; h=from:subject:message-id; bh=PSgvoG/VeBHlNw/xybnGmp2VjTgkoJJ22Of1xt8QDDI=; b=owEBbQKS/ZANAwAIAQAOaEEZVoIVAcsmYgBmzHkrdyhy3gi+oajGUxNAMQ0Q6Svd6kHWNGjQR 3Smswpvt4mJAjMEAAEIAB0WIQRLwNeyRHGyoYTq9dMADmhBGVaCFQUCZsx5KwAKCRAADmhBGVaC FY4sEACv7DYAfyiucP/hI8/ZRylosazMVKdyQmg0KjRjpVgiqshJ+2sew4NQcCvv1oAFKpobhP6 pACEowXVpY60WS2Mpvja/G2yO0uGFe62WTLP26a7+hMjDxlhYMh+PeTn6RW8YWCGzP0t5VhVW3j 4iu23WO6yOJ3EaDqv7sCNlhcfKUwGkmeap0h0e9n/XXPRhO5KoUb9KukYEwARucPIPrNondwmZP SE4NE1y8vUWHCaj/iLRDTH1+EA52J9mYFlB3I5vZdntPrX83XhdPg/aEzRT2xQr+ftZT+pMh8zT gGddT1orKMKq5iJKR6UNcQG7IdYJoSeentoun5CA/IWQWR6SqJVBO8KemI7cXOQhA4nvqghXoYR K2WPPCaoNhKdJtz2COnwLZV033amZAt7hhXtuUQGYfk99Sox3PMHQ/9wABxbN+3rJChbEsD7OYQ w/gT2zjrsXxn7uOjlN6krpt1bq7w2BUj9rv/pgfHwdjlNHx6gH4vyJxEMExE8HCbcbeMcJfozKU 0arZWgvWmSVjjcc6gqRY61aHHViX1s7HHf4C1D6YEaR7pPgAvwsNyvZH20OUBLAxYM9mF9BxH6Y qSw3SwKv1thdenCTgS4XHEhJvZPet2U5kXNCgdq91Q/2+2C20B78Wf7D1gfqBxSEVKGdjdtvFPI VBt+0lPmjTlN7kw== X-Developer-Key: i=jlayton@kernel.org; a=openpgp; fpr=4BC0D7B24471B2A184EAF5D3000E684119568215 When updating the ctime on an inode for a setattr with a multigrain filesystem, we usually want to take the latest time we can get for the ctime. The exception to this rule is when there is a nfsd write delegation and the server is proxying timestamps from the client. When nfsd gets a CB_GETATTR response, we want to update the timestamp value in the inode to the values that the client is tracking. The client doesn't send a ctime value (since that's always determined by the exported filesystem), but it does send a mtime value. In the case where it does, then we may also need to update the ctime to a value commensurate with that. Add a ATTR_CTIME_DELEG flag, which tells the underlying setattr machinery to respect that value and not to set it to the current time. Signed-off-by: Jeff Layton --- fs/attr.c | 10 +++++++++- include/linux/fs.h | 1 + 2 files changed, 10 insertions(+), 1 deletion(-) diff --git a/fs/attr.c b/fs/attr.c index 7144b207e715..0eb7b228b94d 100644 --- a/fs/attr.c +++ b/fs/attr.c @@ -295,7 +295,15 @@ static void setattr_copy_mgtime(struct inode *inode, const struct iattr *attr) return; } - now = inode_set_ctime_current(inode); + /* + * In the case of an update for a write delegation, we must respect + * the value in ia_ctime and not use the current time. + */ + if (ia_valid & ATTR_CTIME_DLG) + inode_set_ctime_to_ts(inode, attr->ia_ctime); + else + now = inode_set_ctime_current(inode); + if (ia_valid & ATTR_ATIME_SET) inode_set_atime_to_ts(inode, attr->ia_atime); else if (ia_valid & ATTR_ATIME) diff --git a/include/linux/fs.h b/include/linux/fs.h index 7c1da3c687bd..43a802b2cb0d 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -211,6 +211,7 @@ typedef int (dio_iodone_t)(struct kiocb *iocb, loff_t offset, #define ATTR_TIMES_SET (1 << 16) #define ATTR_TOUCH (1 << 17) #define ATTR_DELEG (1 << 18) /* Delegated attrs (don't break) */ +#define ATTR_CTIME_DLG (1 << 19) /* Delegation in effect */ /* * Whiteout is represented by a char device. The following constants define the