From patchwork Wed Feb 24 19:47:39 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: mchristi@redhat.com X-Patchwork-Id: 587621 Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 7E0AF140C8F for ; Thu, 25 Feb 2016 06:49:34 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758121AbcBXTsd (ORCPT ); Wed, 24 Feb 2016 14:48:33 -0500 Received: from mx1.redhat.com ([209.132.183.28]:45587 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752247AbcBXTs3 (ORCPT ); Wed, 24 Feb 2016 14:48:29 -0500 Received: from int-mx09.intmail.prod.int.phx2.redhat.com (int-mx09.intmail.prod.int.phx2.redhat.com [10.5.11.22]) by mx1.redhat.com (Postfix) with ESMTPS id 073CD627F6; Wed, 24 Feb 2016 19:48:29 +0000 (UTC) Received: from rh2.redhat.com (vpn-54-14.rdu2.redhat.com [10.10.54.14]) by int-mx09.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u1OJmJE7006684; Wed, 24 Feb 2016 14:48:26 -0500 From: mchristi@redhat.com To: linux-f2fs-devel@lists.sourceforge.net, linux-ext4@vger.kernel.org, konrad.wilk@oracle.com, drbd-dev@lists.linbit.com, philipp.reisner@linbit.com, lars.ellenberg@linbit.com, linux-raid@vger.kernel.org, dm-devel@redhat.com, linux-fsdevel@vger.kernel.org, linux-bcache@vger.kernel.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org, linux-mtd@lists.infradead.org, target-devel@vger.kernel.org, linux-btrfs@vger.kernel.org, osd-dev@open-osd.org, xfs@oss.sgi.com, ocfs2-devel@oss.oracle.com Cc: Mike Christie Subject: [PATCH 02/35] block: add REQ_OP definitions and bi_op/op fields Date: Wed, 24 Feb 2016 13:47:39 -0600 Message-Id: <1456343292-14535-3-git-send-email-mchristi@redhat.com> In-Reply-To: <1456343292-14535-1-git-send-email-mchristi@redhat.com> References: <1456343292-14535-1-git-send-email-mchristi@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.22 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.38]); Wed, 24 Feb 2016 19:48:29 +0000 (UTC) Sender: linux-ext4-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-ext4@vger.kernel.org From: Mike Christie The following patches separate the operation (write, read, discard, etc) from the flags in bi_rw/cmd_flags. This patch adds definitions for request/bio operations, adds fields to the request/bio to set them, and some temporary compat code so the kernel/modules can use either one. In the final patches this compat code will be removed when everything is converted. Also, in this patch the REQ_OPs match the REQ rq_flag_bits ones for compat reasons while all the code is converted in this set. In the last patches that will also be removed. Signed-off-by: Mike Christie --- block/blk-core.c | 19 ++++++++++++++++--- include/linux/blk_types.h | 15 ++++++++++++++- include/linux/blkdev.h | 1 + include/linux/fs.h | 37 +++++++++++++++++++++++++++++++++++-- 4 files changed, 66 insertions(+), 6 deletions(-) diff --git a/block/blk-core.c b/block/blk-core.c index f23d1b0..74aa201 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -1697,7 +1697,8 @@ void init_request_from_bio(struct request *req, struct bio *bio) { req->cmd_type = REQ_TYPE_FS; - req->cmd_flags |= bio->bi_rw & REQ_COMMON_MASK; + /* tmp compat. Allow users to set bi_op or bi_rw */ + req->cmd_flags |= (bio->bi_rw | bio->bi_op) & REQ_COMMON_MASK; if (bio->bi_rw & REQ_RAHEAD) req->cmd_flags |= REQ_FAILFAST_MASK; @@ -2032,6 +2033,12 @@ blk_qc_t generic_make_request(struct bio *bio) struct bio_list bio_list_on_stack; blk_qc_t ret = BLK_QC_T_NONE; + /* tmp compat. Allow users to set either one or both. + * This will be removed when we have converted + * everyone in the next patches. + */ + bio->bi_rw |= bio->bi_op; + if (!generic_make_request_checks(bio)) goto out; @@ -2101,6 +2108,12 @@ EXPORT_SYMBOL(generic_make_request); */ blk_qc_t submit_bio(struct bio *bio) { + /* tmp compat. Allow users to set either one or both. + * This will be removed when we have converted + * everyone in the next patches. + */ + bio->bi_rw |= bio->bi_op; + /* * If it's a regular read/write or a barrier with data attached, * go through the normal accounting stuff before submission. @@ -2974,8 +2987,8 @@ EXPORT_SYMBOL_GPL(__blk_end_request_err); void blk_rq_bio_prep(struct request_queue *q, struct request *rq, struct bio *bio) { - /* Bit 0 (R/W) is identical in rq->cmd_flags and bio->bi_rw */ - rq->cmd_flags |= bio->bi_rw & REQ_WRITE; + /* tmp compat. Allow users to set bi_op or bi_rw */ + rq->cmd_flags |= bio_data_dir(bio); if (bio_has_data(bio)) rq->nr_phys_segments = bio_phys_segments(q, bio); diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h index 86a38ea..6e49c91 100644 --- a/include/linux/blk_types.h +++ b/include/linux/blk_types.h @@ -48,9 +48,15 @@ struct bio { struct block_device *bi_bdev; unsigned int bi_flags; /* status, command, etc */ int bi_error; - unsigned long bi_rw; /* bottom bits READ/WRITE, + unsigned long bi_rw; /* bottom bits rq_flags_bits * top bits priority */ + /* + * this will be a u8 in the next patches and bi_rw can be shrunk to + * a u32. For compat in these transistional patches op is a int here. + */ + int bi_op; /* REQ_OP */ + struct bvec_iter bi_iter; @@ -242,6 +248,13 @@ enum rq_flag_bits { #define REQ_HASHED (1ULL << __REQ_HASHED) #define REQ_MQ_INFLIGHT (1ULL << __REQ_MQ_INFLIGHT) +enum req_op { + REQ_OP_READ, + REQ_OP_WRITE = REQ_WRITE, + REQ_OP_DISCARD = REQ_DISCARD, + REQ_OP_WRITE_SAME = REQ_WRITE_SAME, +}; + typedef unsigned int blk_qc_t; #define BLK_QC_T_NONE -1U #define BLK_QC_T_SHIFT 16 diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 40c0241..d4d3b06 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -96,6 +96,7 @@ struct request { struct request_queue *q; struct blk_mq_ctx *mq_ctx; + int op; u64 cmd_flags; unsigned cmd_type; unsigned long atomic_flags; diff --git a/include/linux/fs.h b/include/linux/fs.h index 3d9fdf4..399b22b 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -2434,15 +2434,48 @@ extern void make_bad_inode(struct inode *); extern bool is_bad_inode(struct inode *); #ifdef CONFIG_BLOCK + +static inline bool op_is_write(int op) +{ + switch (op) { + case REQ_OP_WRITE: + case REQ_OP_WRITE_SAME: + case REQ_OP_DISCARD: + return true; + default: + return false; + } +} + /* * return READ, READA, or WRITE */ -#define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK)) +static inline int bio_rw(struct bio *bio) +{ + /* + * tmp cpmpat. Allow users to set either op or rw, until + * all code is converted in the next patches. + */ + if (op_is_write(bio->bi_op)) + return WRITE; + + return bio->bi_rw & (RW_MASK | RWA_MASK); +} /* * return data direction, READ or WRITE */ -#define bio_data_dir(bio) ((bio)->bi_rw & 1) +static inline int bio_data_dir(struct bio *bio) +{ + /* + * tmp cpmpat. Allow users to set either op or rw, until + * all code is converted in the next patches. + */ + if (op_is_write(bio->bi_op)) + return WRITE; + + return bio->bi_rw & 1; +} extern void check_disk_size_change(struct gendisk *disk, struct block_device *bdev);