From patchwork Mon Jul 1 16:51:15 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 810591 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 50D8516D4F4; Mon, 1 Jul 2024 16:52:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.137.202.133 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719852766; cv=none; b=h2TjbfpJUgy/7X1yqs95PUoasUFgPHrYCxhjyJl1mzbmqOJlQMx//hpV97qs+HNoVG/XF9pYjcpCiY1QqONKmi2YgzICap6kPPEQ5j4hbv0CmFOAPNA48Dv0d3A0f1wFtOOtZXnLQSyae553PJkZBF5ULe/r1Uk1oVadwXNUk/I= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719852766; c=relaxed/simple; bh=bkBqvU8+udzDY3YWr9bvQ3s+zzZXwra3PaEaBxKtj2k=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=lghOv3QssqZ/KLj4DBoWEPCtiMF92IZrIaXYJjXY1Pg9uYyQhQha75FwKkUB4QCbC05ukadpMYEgklyoq2zH5OJ2W4hcJtL3dMwtDCGJgMVYa6Ry1s8OSCgysJv+Pi2KzfmMGwGif+TlTyTEemFwHiyHqFM3uhLvz3M8Do46hC0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de; spf=none smtp.mailfrom=bombadil.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=CfPrCIkd; arc=none smtp.client-ip=198.137.202.133 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=bombadil.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="CfPrCIkd" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description; bh=PF/pH6GqS8l9M6N2BcoMrMWTHNBHwOz4qGTXXLsturA=; b=CfPrCIkdMKmx7SlbwEi8FaDRfc Cvrq2It5W1Vv/d3nw4XoJCmR51wq0K3AMzS3V7uilHuU20fFnydJJZJNRpjwZ3Ngn+jQfg3kMiu1l 6TdB1RkiMROvxBGoX6YP5PNq/jLndh/wICFKNw+5HgT1U3Ljgs5yOM0471rajytsAPmgaoaacR/Li EMxbR88bn6hySGuiAB0uIhItMZd78eiacGI3pBNgD+IlSvQgPfS/JG4+XWrcqky3qwyVMYhcKB21W DBVR8lu131AgKbhSnT/QAmiLOjuzsxhwp48RocKdOCe2wemOubuUDtcgxJVyre/SuvdA1eTEGuaa6 F8el2uOw==; Received: from 2a02-8389-2341-5b80-6bfa-ffbf-d1d1-ec94.cable.dynamic.v6.surfer.at ([2a02:8389:2341:5b80:6bfa:ffbf:d1d1:ec94] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.97.1 #2 (Red Hat Linux)) id 1sOKGh-00000004BfP-1HbS; Mon, 01 Jul 2024 16:52:43 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Keith Busch , Conrad Meyer , Ulf Hansson , linux-mmc@vger.kernel.org, linux-block@vger.kernel.org Subject: [PATCH 05/10] block: factor out a blk_write_zeroes_limit helper Date: Mon, 1 Jul 2024 18:51:15 +0200 Message-ID: <20240701165219.1571322-6-hch@lst.de> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240701165219.1571322-1-hch@lst.de> References: <20240701165219.1571322-1-hch@lst.de> Precedence: bulk X-Mailing-List: linux-mmc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Contrary to the comment in __blkdev_issue_write_zeroes, nothing here checks for a potential bi_size overflow. Add a helper mirroring the secure erase code for the check. Signed-off-by: Christoph Hellwig --- block/blk-lib.c | 18 +++++++++++------- 1 file changed, 11 insertions(+), 7 deletions(-) diff --git a/block/blk-lib.c b/block/blk-lib.c index cf4f0ee6b14503..f338709aef0c30 100644 --- a/block/blk-lib.c +++ b/block/blk-lib.c @@ -103,24 +103,28 @@ int blkdev_issue_discard(struct block_device *bdev, sector_t sector, } EXPORT_SYMBOL(blkdev_issue_discard); +static sector_t bio_write_zeroes_limit(struct block_device *bdev) +{ + sector_t bs_mask = (bdev_logical_block_size(bdev) >> 9) - 1; + + return min(bdev_write_zeroes_sectors(bdev), + (UINT_MAX >> SECTOR_SHIFT) & ~bs_mask); +} + static int __blkdev_issue_write_zeroes(struct block_device *bdev, sector_t sector, sector_t nr_sects, gfp_t gfp_mask, struct bio **biop, unsigned flags) { struct bio *bio = *biop; - unsigned int max_sectors; if (bdev_read_only(bdev)) return -EPERM; - - /* Ensure that max_sectors doesn't overflow bi_size */ - max_sectors = bdev_write_zeroes_sectors(bdev); - - if (max_sectors == 0) + if (!bdev_write_zeroes_sectors(bdev)) return -EOPNOTSUPP; while (nr_sects) { - unsigned int len = min_t(sector_t, nr_sects, max_sectors); + unsigned int len = min_t(sector_t, nr_sects, + bio_write_zeroes_limit(bdev)); bio = blk_next_bio(bio, bdev, 0, REQ_OP_WRITE_ZEROES, gfp_mask); bio->bi_iter.bi_sector = sector;