From mboxrd@z Thu Jan 1 00:00:00 1970 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 3CD262ECE9E; Tue, 4 Nov 2025 12:12:38 +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=1762258360; cv=none; b=HZQdY/T7BoqAQRsrxSkEhZUXGhMqg92PFL+i/LyhSTbt4fUKvQnf2HK4uBZ6nvOhbwqFyh4tWmaZjS5HZkDEAAwmK4LB/rd298vBl/xp4W4q6xW2SR8xHKnfaXvaUNcR664+nC+2W34EW8D+h4T5+OdA9hVutMMYk+krFb0PRqk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762258360; c=relaxed/simple; bh=CIuyhA1SE77JCvvV7gCQAcX8DXg3tOccPVuCi/0awLU=; h=From:Subject:Date:Message-Id:MIME-Version:Content-Type:To:Cc; b=dJ4ytGyPS/SVEQCv6qMKqzCvSkCwr1uIcUzS5w/bU49azB8dAjqfuFVX7OPxtXlY+C6zhdXyRBwrea7ZfG5Vx7D8ugDQ/N0LIND+1Dn7yGbfg+vefLZyBa2LhwzhHajXf0s9PJAAjR64tMwK3tYMof06Fr1F2yzKye71Fn8uHDM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=LVDlSM8B; 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="LVDlSM8B" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 15144C4CEF7; Tue, 4 Nov 2025 12:12:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1762258358; bh=CIuyhA1SE77JCvvV7gCQAcX8DXg3tOccPVuCi/0awLU=; h=From:Subject:Date:To:Cc:From; b=LVDlSM8B8MEG0S4WDNJ4bkaJqLmR65+8+LOK0k4a4t3evokZWqPaRDJ+SFJWpiiAN m0B54ljecsDO0jzUbjDWlM7YqRgrQP7H9PcFUzn1MnoSm17xDy9fazysa5ArAgtD6K AA22YHjvznNjvwwpb79sWR40921OQWA5pQxUOxoQ7v+vOPLDo20FY4Q7Dh8f5HYIAv BxCVrgcN6YqCI9BeCRy+Zrh5s6+G/PAXSw8F+GuN6eTljy9TpgFA2HzxSdzDd+RJBO 50arLI3ISJAihDYz0rqxe1x9JiNsLqjCPnUQTJGk5KpjJm24maWFUb1WtI/0/92q+X 0lufpjS5UoU7Q== From: Christian Brauner Subject: [PATCH RFC 0/8] fs: introduce super write guard Date: Tue, 04 Nov 2025 13:12:29 +0100 Message-Id: <20251104-work-guards-v1-0-5108ac78a171@kernel.org> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-B4-Tracking: v=1; b=H4sIAK3tCWkC/x2MQQ6CMBAAv0L27JK2iKJXEx/g1XhY2gUaQzG7i iaEv1s9ziQzCyhLZIVjsYDwHDVOKYPdFOAHSj1jDJnBGVdba7b4nuSO/YskKHZchT2ZA7u6gVw 8hLv4+d+ucDmf4JZlS8rYCiU//EYj6ZOlnHelbVB8Bev6BfndiZuFAAAA X-Change-ID: 20251104-work-guards-fe3d7a09e258 To: linux-fsdevel@vger.kernel.org Cc: Alexander Viro , Jan Kara , linux-btrfs@vger.kernel.org, linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org, Christian Brauner X-Mailer: b4 0.15-dev-a6db3 X-Developer-Signature: v=1; a=openpgp-sha256; l=1248; i=brauner@kernel.org; h=from:subject:message-id; bh=CIuyhA1SE77JCvvV7gCQAcX8DXg3tOccPVuCi/0awLU=; b=owGbwMvMwCU28Zj0gdSKO4sYT6slMWRyvt2iPkvi+JrF+Uc6WnfcK2EwD04W+J144XDV2VkzN r5qyC2a2FHKwiDGxSArpsji0G4SLrecp2KzUaYGzBxWJpAhDFycAjCR2EWMDG8WbvTTvJj0dWno 6ZZUBd4L7U6zH3xpUErZpH5u3tyfFrcZGV7rncs6UH51+qySNXZuIr+KW+M03ocynE20eMdeVnp bmQcA X-Developer-Key: i=brauner@kernel.org; a=openpgp; fpr=4880B8C9BD0E5106FC070F4F7B3C391EFEA93624 Hey, I'm in the process of adding a few more guards for vfs constructs. I've chosen the easy case of super_start_write() and super_end_write() and converted eligible callers. I think long-term we can move a lot of the manual placement to completely rely on guards - where sensible. Christian Signed-off-by: Christian Brauner --- Christian Brauner (8): fs: add super_write_guard btrfs: use super write guard in btrfs_reclaim_bgs_work() btrfs: use super write guard btrfs_run_defrag_inode() btrfs: use super write guard in sb_start_write() ext4: use super write guard in write_mmp_block() btrfs: use super write guard in relocating_repair_kthread() open: use super write guard in do_ftruncate() xfs: use super write guard in xfs_file_ioctl() fs/btrfs/block-group.c | 3 +-- fs/btrfs/defrag.c | 7 +++---- fs/btrfs/volumes.c | 7 ++++--- fs/ext4/mmp.c | 8 ++------ fs/open.c | 9 +++------ fs/xfs/xfs_ioctl.c | 6 ++---- include/linux/fs.h | 5 +++++ 7 files changed, 20 insertions(+), 25 deletions(-) --- base-commit: dcb6fa37fd7bc9c3d2b066329b0d27dedf8becaa change-id: 20251104-work-guards-fe3d7a09e258