From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-lf1-f54.google.com (mail-lf1-f54.google.com [209.85.167.54]) (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 8E7581E1301; Wed, 4 Sep 2024 14:17:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.54 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725459476; cv=none; b=aWAeUljmX2gBJPsZAK2Xe2qiE2dgYN46FfSxFgr60hjYJW/MlAKlfEGv8NTc/WCA1/EZgyE/KWaRCaC1tKGEwaEfiKYDCUKwX6JUVzkSiDIOQOpsyKaARUwvOOwgYXerHJcV5wCOGRRypnwNwM2vqQXgrShJnF9Xfd9Srv8JES8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725459476; c=relaxed/simple; bh=qT92kXhOb3ng0463r8HD9asnYhrFkLRqieKmlMdj6v0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=kXroC8vDFTzJx7cAVUn7PuzU+8jDNoikXq7tRcGhk3q38ZeT227I9JOQ+MqcmhSYePFVyhVlUxHJ0geMREXt3S1eBsJzwfpaygEyQ8Yu6Vof44nCJnz+cljWBawMols1omfmzUr+bi4IoeKlxPV8Eid4z6xTyZqSuIn/7RbUFtk= 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=et1Hv0Om; arc=none smtp.client-ip=209.85.167.54 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="et1Hv0Om" Received: by mail-lf1-f54.google.com with SMTP id 2adb3069b0e04-5334a8a1af7so7096188e87.2; Wed, 04 Sep 2024 07:17:54 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1725459472; x=1726064272; 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=/3weTv0JDO1olCzxF1klLqGqviZ0xpQPSzNHS+GA/qM=; b=et1Hv0OmkszoSyVGQsE0+ggVtHkGET0uFWXqCcboj7WSFJFg3D6ah5/FbWEV5uRJr+ B33hXqmVGgrYBegDxNFkSOK8T9dZ9qBc+G+kApdQCFMW6dOeps7JaaiDeZRJLHRe/tuv h7YzrnncgaTevmAVBQfrv8JQrdnQLu/+6Tr9aRe0kBFXNFiaOac8oTQTbFG4qK0DrH33 RcluuhyVkiGwSTM8imbwJRW1EpeDNlO2460UHvGcwVMkq44bqPBkGa16fQBo1HIH0FCc p9d73u4DcomYzx5fb+XGQk+rl7MFvWkKBclVYzMYwWfefYWvxzFcq6Gjn3ItYOkbXuc2 CDhA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1725459472; x=1726064272; 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=/3weTv0JDO1olCzxF1klLqGqviZ0xpQPSzNHS+GA/qM=; b=VorrE3y/fZzwB5vsDYT4su0ccatU6BfyaDaUkNHE6RLEM7htHDKDsBA64AlHjJYjBE LO+3tm7RbSDuRJeFhoy0zsl3RSNnOxVLWivABGYszX+7q601h/GOoU2FFiBLPhNgW8ck 6D6SIXzkhIEiAj/dWcMA5JnhnDbSBzo9w8Hn7sUPaNShyrtBw5qcSZQ0Pu2edL77X7bB Fsurl+amFoMhRuWE6l9W8//lkY3XQ5xHoliCMWtgl806aOh9M5oH0ziNd7Cuvh20BSaJ k7rkkboSWJY9wt7uEBFRUjS1aM398Vm6w2/wScxmpw36to1hUqx468JtglHQqzDVBdry Fr5A== X-Forwarded-Encrypted: i=1; AJvYcCUYC6+lD+wQsg6eb+LanqXJywr/mrVO7hbuOkxxxxKeJ6l5OZWfC2QwcOyLC0lqHMwPCR2ayBG4MTIgQw==@vger.kernel.org X-Gm-Message-State: AOJu0YzCifgLpVorAxCqg5lIwVLoxuhy8Ks+5gc3QtBfXHApljkEO5Jo /4vJq2gYhV4EIssKFDGs6cop82oL9hb4burLjb9G3U//PI+q/nZnOEL7OQ== X-Google-Smtp-Source: AGHT+IHXEXHSZq9e6Nc/W/109+8Kx4Ik97uxMWG+wzLcTtKwZnA/1xjIlHHukneB6BfUKC9IqvzHsA== X-Received: by 2002:ac2:4c4f:0:b0:533:42ae:c985 with SMTP id 2adb3069b0e04-53546b2df7emr12335403e87.25.1725459472360; Wed, 04 Sep 2024 07:17:52 -0700 (PDT) Received: from 127.0.0.1localhost ([163.114.131.193]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a8989196c88sm811160766b.102.2024.09.04.07.17.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 04 Sep 2024 07:17:51 -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 v3 7/8] block: add nowait flag for __blkdev_issue_zero_pages Date: Wed, 4 Sep 2024 15:18:06 +0100 Message-ID: <292fa1c611adb064efe16ab741aad65c2128ada8.1725459175.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 To reuse __blkdev_issue_zero_pages() in the following patch, we need to make it work with non-blocking requests. Add a new nowait flag we can pass inside. Return errors if something went wrong, and check bio_alloc() for failures, which wasn't supposed to happen before because of what gfp flags the callers are passing. Note that there might be a bio passed back even when the function returned an error. To limit the scope of the patch, don't add return code handling to callers, that can be deferred to a follow up. Signed-off-by: Pavel Begunkov --- block/blk-lib.c | 22 ++++++++++++++++++---- include/linux/bio.h | 4 ++++ include/linux/blkdev.h | 1 + 3 files changed, 23 insertions(+), 4 deletions(-) diff --git a/block/blk-lib.c b/block/blk-lib.c index c94c67a75f7e..a16b7c7965e8 100644 --- a/block/blk-lib.c +++ b/block/blk-lib.c @@ -193,20 +193,32 @@ static unsigned int __blkdev_sectors_to_bio_pages(sector_t nr_sects) return min(pages, (sector_t)BIO_MAX_VECS); } -static void __blkdev_issue_zero_pages(struct block_device *bdev, +int blkdev_issue_zero_pages_bio(struct block_device *bdev, sector_t sector, sector_t nr_sects, gfp_t gfp_mask, struct bio **biop, unsigned int flags) { + blk_opf_t opf = REQ_OP_WRITE; + + if (flags & BLKDEV_ZERO_PAGES_NOWAIT) { + sector_t max_bio_sectors = BIO_MAX_VECS << PAGE_SECTORS_SHIFT; + + if (nr_sects > max_bio_sectors) + return -EAGAIN; + opf |= REQ_NOWAIT; + } + while (nr_sects) { unsigned int nr_vecs = __blkdev_sectors_to_bio_pages(nr_sects); struct bio *bio; bio = bio_alloc(bdev, nr_vecs, REQ_OP_WRITE, gfp_mask); + if (!bio) + return -ENOMEM; bio->bi_iter.bi_sector = sector; if ((flags & BLKDEV_ZERO_KILLABLE) && fatal_signal_pending(current)) - break; + return -EINTR; do { unsigned int len, added; @@ -223,6 +235,8 @@ static void __blkdev_issue_zero_pages(struct block_device *bdev, *biop = bio_chain_and_submit(*biop, bio); cond_resched(); } + + return 0; } static int blkdev_issue_zero_pages(struct block_device *bdev, sector_t sector, @@ -236,7 +250,7 @@ static int blkdev_issue_zero_pages(struct block_device *bdev, sector_t sector, return -EOPNOTSUPP; blk_start_plug(&plug); - __blkdev_issue_zero_pages(bdev, sector, nr_sects, gfp, &bio, flags); + blkdev_issue_zero_pages_bio(bdev, sector, nr_sects, gfp, &bio, flags); if (bio) { if ((flags & BLKDEV_ZERO_KILLABLE) && fatal_signal_pending(current)) { @@ -286,7 +300,7 @@ int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, } else { if (flags & BLKDEV_ZERO_NOFALLBACK) return -EOPNOTSUPP; - __blkdev_issue_zero_pages(bdev, sector, nr_sects, gfp_mask, + blkdev_issue_zero_pages_bio(bdev, sector, nr_sects, gfp_mask, biop, flags); } return 0; diff --git a/include/linux/bio.h b/include/linux/bio.h index 78ead424484c..87d85b326e1e 100644 --- a/include/linux/bio.h +++ b/include/linux/bio.h @@ -686,4 +686,8 @@ struct bio *blk_alloc_discard_bio(struct block_device *bdev, sector_t bio_discard_limit(struct block_device *bdev, sector_t sector); +int blkdev_issue_zero_pages_bio(struct block_device *bdev, + sector_t sector, sector_t nr_sects, gfp_t gfp_mask, + struct bio **biop, unsigned int flags); + #endif /* __LINUX_BIO_H */ diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 643c9020a35a..bf1aa951fda2 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -1098,6 +1098,7 @@ int blkdev_issue_secure_erase(struct block_device *bdev, sector_t sector, #define BLKDEV_ZERO_NOUNMAP (1 << 0) /* do not free blocks */ #define BLKDEV_ZERO_NOFALLBACK (1 << 1) /* don't write explicit zeroes */ #define BLKDEV_ZERO_KILLABLE (1 << 2) /* interruptible by fatal signals */ +#define BLKDEV_ZERO_PAGES_NOWAIT (1 << 3) /* non-blocking submission */ extern int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, sector_t nr_sects, gfp_t gfp_mask, struct bio **biop, -- 2.45.2