From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ej1-f48.google.com (mail-ej1-f48.google.com [209.85.218.48]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D7B1D15B10B; Fri, 6 Sep 2024 22:57:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.218.48 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725663429; cv=none; b=BE0+n3Cv3B8/ct+vyRtgSat7K97YKLaHLxWvF2krVq5E3cNf3eCXgpYhmXTn2csxZU3xYvC/l2wwQSjrQDkGsDKmC4YM5B84fTPUKyRptPQ9eHG7hVUon9ocWnfISKcW7iJjCHSz3jMcLqab53yR2RmQePQ0aFk+/IeN9IFbYM0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725663429; c=relaxed/simple; bh=lyDccPclJxGZedhLYadtZmxYdaswgU6YsCGNLhOcKgM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=DxMgGmAscrtnuAkMY+J6jFqjuz21SYpo3P6fsHpDa83uwxLXxg9MFkHpAj5Jd5pXTKys4DRmP/E9Vp//LxGO6j20cmXr2lxY0FvLFSC2X+1cSrOidDYFJoTnMgTcea5PBY6114Wjli+U2vBYYzmUhIwI9beQfaSfPk7qsB2O5JY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=gpizstF0; arc=none smtp.client-ip=209.85.218.48 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="gpizstF0" Received: by mail-ej1-f48.google.com with SMTP id a640c23a62f3a-a868b739cd9so336002466b.2; Fri, 06 Sep 2024 15:57:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1725663426; x=1726268226; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=sVNRBhtechMDGkg+NH1UKI/XUcjXx3fSa2oGaERaZjA=; b=gpizstF0vvM1yQQkTvSDZes8KRn6U+zPNVRbOqmOadV1qwfNi69Y0dvwLzzbUMteRq ickWom9bpeVno/N8S4T7Pv/o9CYFA2y421o2NvX3ZOnBOS+5WkKEaavk4YPiohXHubzW vr/BGiwXVKcFjLUwm+vnR4zYqtMRzVk2DtPjLLLydLp0ye7coz8cq6Zar+M5DlpDOwmZ EVP+pzoeedOjeYJzxWIoC3/nkVBdh0jCgKgho2EZUqOrxw2EBdb5RfHebHkqYNFs1YkH YGznCFGJpl/etPkwbNTzqIIRBF1LSLfMLLmsXU7sHR3fZlSpJY6omWB0L98lUNzjPMee xwsw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1725663426; x=1726268226; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=sVNRBhtechMDGkg+NH1UKI/XUcjXx3fSa2oGaERaZjA=; b=PNYU0Rz09vnwsSM77wDEW5rdVehVvq4F7etNiv/z2IlNV5WxQZRqXxSTa8/tKiN2/V 8zwrVk9C8qad5DW8NTn9PeD1o6yrLmq0bAm5E58PPK2EZ5iqnZ8SxKmy5yP8XMr3/gum e/POW9kVWocN8qtU76c3GUEZvJEjRk7pdHnrME3S0XtxUXBSUWV6jxJVpwSQuEph+F/y n6kPSP/wc1j9yVM8ZBgeOQO0lky3qqp92/SGK4nU1UH95GVfYIZjoAQlb6nEGbjM8nZp qU654sx2REuqF1Nvt9q5WwRAWcd/4IqPb+WHdTY6oPxE2XBKA+Gu+U6H30prLyqsP5tM LKGA== X-Forwarded-Encrypted: i=1; AJvYcCVLf01gYazF45YizydxE5J0k04F3tJNsOUHkQesuMQrJ7/kyugkuSsY5mts4PeWC4BVXUR1CXfA4e0gdA==@vger.kernel.org X-Gm-Message-State: AOJu0YzQHV0f63qdKogFyFzCw1xaJKrzyAM2jQi2gFiUxsnMLYvj2Trp d8ib0ciQNPaSUKPd5Aw1XBe+5cAy0Mrg/gGrpV5rQhsUktzb0XlVBhm4u+3w X-Google-Smtp-Source: AGHT+IGwtkNX+b7B+F+E65xCqdvf83CYwy/QQoEkioql8r4UWUgpbreyku1f9KDVfE9jAVw9Or4nJQ== X-Received: by 2002:a17:907:968b:b0:a86:b46b:860a with SMTP id a640c23a62f3a-a8d1c738eedmr53296966b.54.1725663425531; Fri, 06 Sep 2024 15:57:05 -0700 (PDT) Received: from 127.0.0.1localhost ([148.252.146.236]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a8d25d54978sm2679566b.199.2024.09.06.15.57.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 06 Sep 2024 15:57:05 -0700 (PDT) From: Pavel Begunkov To: io-uring@vger.kernel.org Cc: Jens Axboe , asml.silence@gmail.com, Conrad Meyer , linux-block@vger.kernel.org, linux-mm@kvack.org, Christoph Hellwig Subject: [PATCH v4 6/8] block: implement async write zeroes command Date: Fri, 6 Sep 2024 23:57:23 +0100 Message-ID: <2a99dd14c2e0c1fced433822a13ff00735a84816.1725621577.git.asml.silence@gmail.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: References: Precedence: bulk X-Mailing-List: io-uring@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Add another io_uring cmd for block layer implementing asynchronous write zeroes. It reuses helpers we've added for async discards, and inherits the code structure as well as all considerations in regards to page cache races. Suggested-by: Conrad Meyer Signed-off-by: Pavel Begunkov --- block/ioctl.c | 64 +++++++++++++++++++++++++++++++++++++++++ include/uapi/linux/fs.h | 1 + 2 files changed, 65 insertions(+) diff --git a/block/ioctl.c b/block/ioctl.c index 19fba8332eee..ef4b2a90ad79 100644 --- a/block/ioctl.c +++ b/block/ioctl.c @@ -772,6 +772,67 @@ static void bio_cmd_bio_end_io(struct bio *bio) bio_put(bio); } +static int blkdev_cmd_write_zeroes(struct io_uring_cmd *cmd, + struct block_device *bdev, + uint64_t start, uint64_t len, bool nowait) +{ + + sector_t bs_mask = (bdev_logical_block_size(bdev) >> SECTOR_SHIFT) - 1; + sector_t limit = bdev_write_zeroes_sectors(bdev); + sector_t sector = start >> SECTOR_SHIFT; + sector_t nr_sects = len >> SECTOR_SHIFT; + struct bio *prev = NULL, *bio; + gfp_t gfp = nowait ? GFP_NOWAIT : GFP_KERNEL; + int err; + + if (!(file_to_blk_mode(cmd->file) & BLK_OPEN_WRITE)) + return -EBADF; + if (bdev_read_only(bdev)) + return -EPERM; + err = blk_validate_byte_range(bdev, start, len); + if (err) + return err; + + if (!limit) + return -EOPNOTSUPP; + /* + * Don't allow multi-bio non-blocking submissions as subsequent bios + * may fail but we won't get a direct indication of that. Normally, + * the caller should retry from a blocking context. + */ + if (nowait && nr_sects > limit) + return -EAGAIN; + + err = filemap_invalidate_pages(bdev->bd_mapping, start, + start + len - 1, nowait); + if (err) + return err; + + limit = min(limit, (UINT_MAX >> SECTOR_SHIFT) & ~bs_mask); + while (nr_sects) { + sector_t bio_sects = min(nr_sects, limit); + + bio = bio_alloc(bdev, 0, REQ_OP_WRITE_ZEROES|REQ_NOUNMAP, gfp); + if (!bio) + break; + if (nowait) + bio->bi_opf |= REQ_NOWAIT; + bio->bi_iter.bi_sector = sector; + bio->bi_iter.bi_size = bio_sects << SECTOR_SHIFT; + sector += bio_sects; + nr_sects -= bio_sects; + + prev = bio_chain_and_submit(prev, bio); + } + if (!prev) + return -EAGAIN; + + prev->bi_private = cmd; + prev->bi_end_io = bio_cmd_bio_end_io; + submit_bio(prev); + return -EIOCBQUEUED; +} + static int blkdev_cmd_discard(struct io_uring_cmd *cmd, struct block_device *bdev, uint64_t start, uint64_t len, bool nowait) @@ -841,6 +902,9 @@ int blkdev_uring_cmd(struct io_uring_cmd *cmd, unsigned int issue_flags) switch (cmd_op) { case BLOCK_URING_CMD_DISCARD: return blkdev_cmd_discard(cmd, bdev, start, len, bic->nowait); + case BLOCK_URING_CMD_WRITE_ZEROES: + return blkdev_cmd_write_zeroes(cmd, bdev, start, len, + bic->nowait); } return -EINVAL; } diff --git a/include/uapi/linux/fs.h b/include/uapi/linux/fs.h index 7ea41ca97158..68b0fccebf92 100644 --- a/include/uapi/linux/fs.h +++ b/include/uapi/linux/fs.h @@ -209,6 +209,7 @@ struct fsxattr { */ #define BLOCK_URING_CMD_DISCARD _IO(0x12,137) +#define BLOCK_URING_CMD_WRITE_ZEROES _IO(0x12,138) #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */ #define FIBMAP _IO(0x00,1) /* bmap access */ -- 2.45.2