8326eb4605
Most of the blk_* macros were removed in 2.6.36. Ostensibly this was done to improve readability and allow easier grepping. However, from a portability stand point the macros are helpful. Therefore the needed macros are redefined here if they are missing from the kernel.
265 lines
7.0 KiB
C
265 lines
7.0 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (C) 2008-2010 Lawrence Livermore National Security, LLC.
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* Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
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* Written by Brian Behlendorf <behlendorf1@llnl.gov>.
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* LLNL-CODE-403049.
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*/
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#ifndef _SYS_BLKDEV_H
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#define _SYS_BLKDEV_H
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#ifdef _KERNEL
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#include <linux/blkdev.h>
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#include <linux/elevator.h>
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#ifndef HAVE_FMODE_T
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typedef unsigned __bitwise__ fmode_t;
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#endif /* HAVE_FMODE_T */
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#ifndef HAVE_BLK_FETCH_REQUEST
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static inline struct request *
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blk_fetch_request(struct request_queue *q)
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{
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struct request *req;
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req = elv_next_request(q);
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if (req)
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blkdev_dequeue_request(req);
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return req;
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}
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#endif /* HAVE_BLK_FETCH_REQUEST */
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#ifndef HAVE_BLK_REQUEUE_REQUEST
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static inline void
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blk_requeue_request(request_queue_t *q, struct request *req)
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{
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elv_requeue_request(q, req);
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}
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#endif /* HAVE_BLK_REQUEUE_REQUEST */
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#ifndef HAVE_BLK_END_REQUEST
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static inline bool
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__blk_end_request(struct request *req, int error, unsigned int nr_bytes)
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{
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LIST_HEAD(list);
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/*
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* Request has already been dequeued but 2.6.18 version of
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* end_request() unconditionally dequeues the request so we
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* add it to a local list to prevent hitting the BUG_ON.
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*/
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list_add(&req->queuelist, &list);
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/*
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* The old API required the driver to end each segment and not
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* the entire request. In our case we always need to end the
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* entire request partial requests are not supported.
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*/
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req->hard_cur_sectors = nr_bytes >> 9;
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end_request(req, ((error == 0) ? 1 : error));
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return 0;
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}
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static inline bool
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blk_end_request(struct request *req, int error, unsigned int nr_bytes)
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{
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struct request_queue *q = req->q;
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bool rc;
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spin_lock_irq(q->queue_lock);
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rc = __blk_end_request(req, error, nr_bytes);
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spin_unlock_irq(q->queue_lock);
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return rc;
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}
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#else
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# ifdef HAVE_BLK_END_REQUEST_GPL_ONLY
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/*
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* Define required to avoid conflicting 2.6.29 non-static prototype for a
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* GPL-only version of the helper. As of 2.6.31 the helper is available
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* to non-GPL modules and is not explicitly exported GPL-only.
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*/
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# define __blk_end_request __blk_end_request_x
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# define blk_end_request blk_end_request_x
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static inline bool
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__blk_end_request_x(struct request *req, int error, unsigned int nr_bytes)
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{
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/*
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* The old API required the driver to end each segment and not
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* the entire request. In our case we always need to end the
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* entire request partial requests are not supported.
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*/
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req->hard_cur_sectors = nr_bytes >> 9;
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end_request(req, ((error == 0) ? 1 : error));
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return 0;
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}
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static inline bool
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blk_end_request_x(struct request *req, int error, unsigned int nr_bytes)
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{
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struct request_queue *q = req->q;
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bool rc;
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spin_lock_irq(q->queue_lock);
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rc = __blk_end_request_x(req, error, nr_bytes);
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spin_unlock_irq(q->queue_lock);
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return rc;
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}
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# endif /* HAVE_BLK_END_REQUEST_GPL_ONLY */
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#endif /* HAVE_BLK_END_REQUEST */
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#ifndef HAVE_BLK_RQ_POS
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static inline sector_t
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blk_rq_pos(struct request *req)
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{
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return req->sector;
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}
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#endif /* HAVE_BLK_RQ_POS */
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#ifndef HAVE_BLK_RQ_SECTORS
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static inline unsigned int
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blk_rq_sectors(struct request *req)
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{
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return req->nr_sectors;
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}
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#endif /* HAVE_BLK_RQ_SECTORS */
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#if !defined(HAVE_BLK_RQ_BYTES) || defined(HAVE_BLK_RQ_BYTES_GPL_ONLY)
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/*
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* Define required to avoid conflicting 2.6.29 non-static prototype for a
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* GPL-only version of the helper. As of 2.6.31 the helper is available
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* to non-GPL modules in the form of a static inline in the header.
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*/
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#define blk_rq_bytes __blk_rq_bytes
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static inline unsigned int
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__blk_rq_bytes(struct request *req)
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{
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return blk_rq_sectors(req) << 9;
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}
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#endif /* !HAVE_BLK_RQ_BYTES || HAVE_BLK_RQ_BYTES_GPL_ONLY */
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/*
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* Most of the blk_* macros were removed in 2.6.36. Ostensibly this was
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* done to improve readability and allow easier grepping. However, from
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* a portability stand point the macros are helpful. Therefore the needed
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* macros are redefined here if they are missing from the kernel.
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*/
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#ifndef blk_fs_request
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#define blk_fs_request(rq) ((rq)->cmd_type == REQ_TYPE_FS)
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#endif
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#ifndef HAVE_GET_DISK_RO
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static inline int
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get_disk_ro(struct gendisk *disk)
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{
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int policy = 0;
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if (disk->part[0])
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policy = disk->part[0]->policy;
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return policy;
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}
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#endif /* HAVE_GET_DISK_RO */
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#ifndef HAVE_RQ_IS_SYNC
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static inline bool
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rq_is_sync(struct request *req)
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{
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return (req->flags & REQ_RW_SYNC);
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}
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#endif /* HAVE_RQ_IS_SYNC */
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#ifndef HAVE_RQ_FOR_EACH_SEGMENT
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struct req_iterator {
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int i;
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struct bio *bio;
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};
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# define for_each_bio(_bio) \
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for (; _bio; _bio = _bio->bi_next)
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# define __rq_for_each_bio(_bio, rq) \
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if ((rq->bio)) \
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for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next)
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# define rq_for_each_segment(bvl, _rq, _iter) \
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__rq_for_each_bio(_iter.bio, _rq) \
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bio_for_each_segment(bvl, _iter.bio, _iter.i)
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#endif /* HAVE_RQ_FOR_EACH_SEGMENT */
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static inline void
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bio_set_flags_failfast(struct block_device *bdev, int *flags)
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{
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#ifdef CONFIG_BUG
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/*
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* Disable FAILFAST for loopback devices because of the
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* following incorrect BUG_ON() in loop_make_request().
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* This support is also disabled for md devices because the
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* test suite layers md devices on top of loopback devices.
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* This may be removed when the loopback driver is fixed.
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*
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* BUG_ON(!lo || (rw != READ && rw != WRITE));
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*/
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if ((MAJOR(bdev->bd_dev) == LOOP_MAJOR) ||
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(MAJOR(bdev->bd_dev) == MD_MAJOR))
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return;
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#ifdef BLOCK_EXT_MAJOR
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if (MAJOR(bdev->bd_dev) == BLOCK_EXT_MAJOR)
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return;
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#endif /* BLOCK_EXT_MAJOR */
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#endif /* CONFIG_BUG */
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#ifdef HAVE_BIO_RW_FAILFAST_DTD
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/* BIO_RW_FAILFAST_* preferred interface from 2.6.28 - 2.6.35 */
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*flags |=
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((1 << BIO_RW_FAILFAST_DEV) |
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(1 << BIO_RW_FAILFAST_TRANSPORT) |
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(1 << BIO_RW_FAILFAST_DRIVER));
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#else
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# ifdef HAVE_BIO_RW_FAILFAST
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/* BIO_RW_FAILFAST preferred interface from 2.6.12 - 2.6.27 */
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*flags |= (1 << BIO_RW_FAILFAST);
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# else
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# ifdef HAVE_REQ_FAILFAST_MASK
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/* REQ_FAILFAST_* preferred interface from 2.6.36 - 2.6.xx,
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* the BIO_* and REQ_* flags were unified under REQ_* flags. */
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*flags |= REQ_FAILFAST_MASK;
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# endif /* HAVE_REQ_FAILFAST_MASK */
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# endif /* HAVE_BIO_RW_FAILFAST */
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#endif /* HAVE_BIO_RW_FAILFAST_DTD */
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}
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#ifndef DISK_NAME_LEN
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#define DISK_NAME_LEN 32
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#endif /* DISK_NAME_LEN */
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#endif /* KERNEL */
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#endif /* _SYS_BLKDEV_H */
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