From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from dggsgout11.his.huawei.com (dggsgout11.his.huawei.com [45.249.212.51]) (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 A2D1413959C; Thu, 22 Feb 2024 12:51:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.51 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708606305; cv=none; b=Bbu7CtQaO77Ur8hmefHWQltoJ/0PsBFxiQAH5ysl6cpVRpNY0pKF1rywRr2iOBH/cOrkIIX+ECrq51oqwlHRNgQkhOWzHK4Ga9oK1IuIzyrpQLThULo91PyaFXu5EkTOy2L6pP4SsS01VfNbCUeie10wOm6KZNAv1hbMbLd0rZg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708606305; c=relaxed/simple; bh=WhCMtRvTpjW+UTNlDKO2Ztj16Kba68pIXjBVhGY2t3c=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=YQrJ22WiY9QsR0Xur/JVEekZfjiAUgSlZ+1fxHA3dT4NhbJoVmjGkcXldhgov6N9rPBnDoZAFhrkS0YMCSusniKlGyL+7QckRz1V6neVtAyrYB4fgi+ApnAbCChu2KKR48B+7E04J7zRV8VUAP8w0UrP8DOnNXak5CqoOVSlIIU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=huaweicloud.com; spf=pass smtp.mailfrom=huaweicloud.com; arc=none smtp.client-ip=45.249.212.51 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=huaweicloud.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huaweicloud.com Received: from mail.maildlp.com (unknown [172.19.163.235]) by dggsgout11.his.huawei.com (SkyGuard) with ESMTP id 4TgY1K1wtfz4f3mHV; Thu, 22 Feb 2024 20:51:33 +0800 (CST) Received: from mail02.huawei.com (unknown [10.116.40.112]) by mail.maildlp.com (Postfix) with ESMTP id 6B2A71A0568; Thu, 22 Feb 2024 20:51:40 +0800 (CST) Received: from huaweicloud.com (unknown [10.175.104.67]) by APP1 (Coremail) with SMTP id cCh0CgBHGBFSQ9dlQ382Ew--.47909S22; Thu, 22 Feb 2024 20:51:40 +0800 (CST) From: Yu Kuai To: jack@suse.cz, hch@lst.de, brauner@kernel.org, axboe@kernel.dk Cc: linux-fsdevel@vger.kernel.org, linux-block@vger.kernel.org, yukuai3@huawei.com, yukuai1@huaweicloud.com, yi.zhang@huawei.com, yangerkun@huawei.com Subject: [RFC v4 linux-next 18/19] scsi: factor out a helper bdev_read_folio() from scsi_bios_ptable() Date: Thu, 22 Feb 2024 20:45:54 +0800 Message-Id: <20240222124555.2049140-19-yukuai1@huaweicloud.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240222124555.2049140-1-yukuai1@huaweicloud.com> References: <20240222124555.2049140-1-yukuai1@huaweicloud.com> Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CM-TRANSID:cCh0CgBHGBFSQ9dlQ382Ew--.47909S22 X-Coremail-Antispam: 1UD129KBjvJXoWxur45Kr4xZryUZF18Ww17KFg_yoW5GFy8pF Z8Ga98ArW8GF17uw4DZwnrXw13K34Ikw17CayI93sIka9rtrWvgFyvya45AFy0krZ7JFsr XFy7AryF93WjkFJanT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUPI14x267AKxVWrJVCq3wAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2048vs2IY020E87I2jVAFwI0_JF0E3s1l82xGYI kIc2x26xkF7I0E14v26ryj6s0DM28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48ve4kI8wA2 z4x0Y4vE2Ix0cI8IcVAFwI0_Ar0_tr1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI0_Gr1j6F 4UJwA2z4x0Y4vEx4A2jsIE14v26rxl6s0DM28EF7xvwVC2z280aVCY1x0267AKxVW0oVCq 3wAS0I0E0xvYzxvE52x082IY62kv0487Mc02F40EFcxC0VAKzVAqx4xG6I80ewAv7VC0I7 IYx2IY67AKxVWUJVWUGwAv7VC2z280aVAFwI0_Jr0_Gr1lOx8S6xCaFVCjc4AY6r1j6r4U M4x0Y48IcxkI7VAKI48JM4x0x7Aq67IIx4CEVc8vx2IErcIFxwACI402YVCY1x02628vn2 kIc2xKxwCF04k20xvY0x0EwIxGrwCFx2IqxVCFs4IE7xkEbVWUJVW8JwC20s026c02F40E 14v26r1j6r18MI8I3I0E7480Y4vE14v26r106r1rMI8E67AF67kF1VAFwI0_Jw0_GFylIx kGc2Ij64vIr41lIxAIcVC0I7IYx2IY67AKxVW8JVW5JwCI42IY6xIIjxv20xvEc7CjxVAF wI0_Gr1j6F4UJwCI42IY6xAIw20EY4v20xvaj40_Jr0_JF4lIxAIcVC2z280aVAFwI0_Gr 0_Cr1lIxAIcVC2z280aVCY1x0267AKxVW8Jr0_Cr1UYxBIdaVFxhVjvjDU0xZFpf9x0JUQ SdkUUUUU= X-CM-SenderInfo: 51xn3trlr6x35dzhxuhorxvhhfrp/ From: Yu Kuai scsi_bios_ptable() is reading without opening disk as file, factor out a helper to read into block device page cache to prevent access bd_inode directly from scsi. Signed-off-by: Yu Kuai --- block/bdev.c | 19 +++++++++++++++++++ drivers/scsi/scsicam.c | 3 +-- include/linux/blkdev.h | 1 + 3 files changed, 21 insertions(+), 2 deletions(-) diff --git a/block/bdev.c b/block/bdev.c index 60a1479eae83..b7af04d34af2 100644 --- a/block/bdev.c +++ b/block/bdev.c @@ -1211,6 +1211,25 @@ unsigned int block_size(struct block_device *bdev) } EXPORT_SYMBOL_GPL(block_size); +/** + * bdev_read_folio - Read into block device page cache. + * @bdev: the block device which holds the cache to read. + * @pos: the offset that allocated folio will contain. + * + * Read one page into the block device page cache. If it succeeds, the folio + * returned will contain @pos; + * + * This is only used for scsi_bios_ptable(), the bdev is not opened as files. + * + * Return: Uptodate folio on success, ERR_PTR() on failure. + */ +struct folio *bdev_read_folio(struct block_device *bdev, loff_t pos) +{ + return mapping_read_folio_gfp(bdev_mapping(bdev), + pos >> PAGE_SHIFT, GFP_KERNEL); +} +EXPORT_SYMBOL_GPL(bdev_read_folio); + static int __init setup_bdev_allow_write_mounted(char *str) { if (kstrtobool(str, &bdev_allow_write_mounted)) diff --git a/drivers/scsi/scsicam.c b/drivers/scsi/scsicam.c index e2c7d8ef205f..1c99b964a0eb 100644 --- a/drivers/scsi/scsicam.c +++ b/drivers/scsi/scsicam.c @@ -32,11 +32,10 @@ */ unsigned char *scsi_bios_ptable(struct block_device *dev) { - struct address_space *mapping = bdev_whole(dev)->bd_inode->i_mapping; unsigned char *res = NULL; struct folio *folio; - folio = read_mapping_folio(mapping, 0, NULL); + folio = bdev_read_folio(bdev_whole(dev), 0); if (IS_ERR(folio)) return NULL; diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index c510f334c84f..3fb02e3a527a 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -1514,6 +1514,7 @@ struct file *bdev_file_open_by_path(const char *path, blk_mode_t mode, int bd_prepare_to_claim(struct block_device *bdev, void *holder, const struct blk_holder_ops *hops); void bd_abort_claiming(struct block_device *bdev, void *holder); +struct folio *bdev_read_folio(struct block_device *bdev, loff_t pos); /* just for blk-cgroup, don't use elsewhere */ struct block_device *blkdev_get_no_open(dev_t dev); -- 2.39.2