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e48533383b
Commit f4af6bb783 which added support
for REQ_FAILFAST_MASK but the new autoconf test didn't use the same
preprocessor macro name as the code did.
The effect is that FAILFAST mode has not been enabled for ZoL in any
post-2.6.35 kernel.
Retire the HAVE_BIO_RW_FAILFAST interface used in pre-2.6.28 kernels.
Raise an error condition if the FAILFAST interface can't be detected.
Signed-off-by: Tim Chase <tim@onlight.com
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #3386
524 lines
15 KiB
C
524 lines
15 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) 2011 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 _ZFS_BLKDEV_H
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#define _ZFS_BLKDEV_H
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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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/*
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* 2.6.36 API change,
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* The blk_queue_flush() interface has replaced blk_queue_ordered()
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* interface. However, while the old interface was available to all the
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* new one is GPL-only. Thus if the GPL-only version is detected we
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* implement our own trivial helper compatibility funcion. The hope is
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* that long term this function will be opened up.
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*/
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#if defined(HAVE_BLK_QUEUE_FLUSH) && defined(HAVE_BLK_QUEUE_FLUSH_GPL_ONLY)
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#define blk_queue_flush __blk_queue_flush
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static inline void
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__blk_queue_flush(struct request_queue *q, unsigned int flags)
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{
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q->flush_flags = flags & (REQ_FLUSH | REQ_FUA);
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}
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#endif /* HAVE_BLK_QUEUE_FLUSH && HAVE_BLK_QUEUE_FLUSH_GPL_ONLY */
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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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/*
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* 2.6.27 API change,
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* The blk_queue_stackable() queue flag was added in 2.6.27 to handle dm
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* stacking drivers. Prior to this request stacking drivers were detected
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* by checking (q->request_fn == NULL), for earlier kernels we revert to
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* this legacy behavior.
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*/
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#ifndef blk_queue_stackable
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#define blk_queue_stackable(q) ((q)->request_fn == NULL)
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#endif
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/*
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* 2.6.34 API change,
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* The blk_queue_max_hw_sectors() function replaces blk_queue_max_sectors().
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*/
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#ifndef HAVE_BLK_QUEUE_MAX_HW_SECTORS
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#define blk_queue_max_hw_sectors __blk_queue_max_hw_sectors
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static inline void
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__blk_queue_max_hw_sectors(struct request_queue *q, unsigned int max_hw_sectors)
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{
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blk_queue_max_sectors(q, max_hw_sectors);
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}
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#endif
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/*
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* 2.6.34 API change,
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* The blk_queue_max_segments() function consolidates
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* blk_queue_max_hw_segments() and blk_queue_max_phys_segments().
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*/
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#ifndef HAVE_BLK_QUEUE_MAX_SEGMENTS
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#define blk_queue_max_segments __blk_queue_max_segments
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static inline void
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__blk_queue_max_segments(struct request_queue *q, unsigned short max_segments)
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{
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blk_queue_max_phys_segments(q, max_segments);
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blk_queue_max_hw_segments(q, max_segments);
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}
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#endif
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/*
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* 2.6.30 API change,
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* The blk_queue_physical_block_size() function was introduced to
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* indicate the smallest I/O the device can write without incurring
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* a read-modify-write penalty. For older kernels this is a no-op.
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*/
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#ifndef HAVE_BLK_QUEUE_PHYSICAL_BLOCK_SIZE
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#define blk_queue_physical_block_size(q, x) ((void)(0))
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#endif
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/*
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* 2.6.30 API change,
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* The blk_queue_io_opt() function was added to indicate the optimal
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* I/O size for the device. For older kernels this is a no-op.
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*/
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#ifndef HAVE_BLK_QUEUE_IO_OPT
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#define blk_queue_io_opt(q, x) ((void)(0))
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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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#define HAVE_RQ_FOR_EACH_SEGMENT_BVP 1
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#endif /* HAVE_RQ_FOR_EACH_SEGMENT */
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/*
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* 3.14 API change
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* rq_for_each_segment changed from taking bio_vec * to taking bio_vec.
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* We provide rq_for_each_segment4 which takes both.
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* You should not modify the fields in @bv and @bvp.
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*
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* Note: the if-else is just to inject the assignment before the loop body.
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*/
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#ifdef HAVE_RQ_FOR_EACH_SEGMENT_BVP
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#define rq_for_each_segment4(bv, bvp, rq, iter) \
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rq_for_each_segment(bvp, rq, iter) \
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if ((bv = *bvp), 0) \
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; \
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else
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#else
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#define rq_for_each_segment4(bv, bvp, rq, iter) \
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rq_for_each_segment(bv, rq, iter) \
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if ((bvp = &bv), 0) \
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; \
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else
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#endif
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#ifdef HAVE_BIO_BVEC_ITER
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#define BIO_BI_SECTOR(bio) (bio)->bi_iter.bi_sector
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#define BIO_BI_SIZE(bio) (bio)->bi_iter.bi_size
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#define BIO_BI_IDX(bio) (bio)->bi_iter.bi_idx
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#else
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#define BIO_BI_SECTOR(bio) (bio)->bi_sector
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#define BIO_BI_SIZE(bio) (bio)->bi_size
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#define BIO_BI_IDX(bio) (bio)->bi_idx
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#endif
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/*
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* Portable helper for correctly setting the FAILFAST flags. The
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* correct usage has changed 3 times from 2.6.12 to 2.6.38.
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*/
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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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#if defined(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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#elif defined(HAVE_REQ_FAILFAST_MASK)
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/*
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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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*/
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*flags |= REQ_FAILFAST_MASK;
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#else
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#error "Undefined block IO FAILFAST interface."
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#endif
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}
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/*
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* Maximum disk label length, it may be undefined for some kernels.
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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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/*
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* 2.6.24 API change,
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* The bio_end_io() prototype changed slightly. These are helper
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* macro's to ensure the prototype and return value are handled.
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*/
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#ifdef HAVE_2ARGS_BIO_END_IO_T
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#define BIO_END_IO_PROTO(fn, x, y, z) static void fn(struct bio *x, int z)
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#define BIO_END_IO_RETURN(rc) return
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#else
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#define BIO_END_IO_PROTO(fn, x, y, z) static int fn( \
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struct bio *x, \
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unsigned int y, \
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int z)
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#define BIO_END_IO_RETURN(rc) return rc
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#endif /* HAVE_2ARGS_BIO_END_IO_T */
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/*
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* 2.6.38 - 2.6.x API,
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* blkdev_get_by_path()
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* blkdev_put()
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*
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* 2.6.28 - 2.6.37 API,
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* open_bdev_exclusive()
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* close_bdev_exclusive()
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*
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* 2.6.12 - 2.6.27 API,
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* open_bdev_excl()
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* close_bdev_excl()
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*
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* Used to exclusively open a block device from within the kernel.
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*/
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#if defined(HAVE_BLKDEV_GET_BY_PATH)
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#define vdev_bdev_open(path, md, hld) blkdev_get_by_path(path, \
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(md) | FMODE_EXCL, hld)
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#define vdev_bdev_close(bdev, md) blkdev_put(bdev, (md) | FMODE_EXCL)
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#elif defined(HAVE_OPEN_BDEV_EXCLUSIVE)
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#define vdev_bdev_open(path, md, hld) open_bdev_exclusive(path, md, hld)
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#define vdev_bdev_close(bdev, md) close_bdev_exclusive(bdev, md)
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#else
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#define vdev_bdev_open(path, md, hld) open_bdev_excl(path, md, hld)
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#define vdev_bdev_close(bdev, md) close_bdev_excl(bdev)
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#endif /* HAVE_BLKDEV_GET_BY_PATH | HAVE_OPEN_BDEV_EXCLUSIVE */
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/*
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* 2.6.22 API change
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* The function invalidate_bdev() lost it's second argument because
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* it was unused.
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*/
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#ifdef HAVE_1ARG_INVALIDATE_BDEV
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#define vdev_bdev_invalidate(bdev) invalidate_bdev(bdev)
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#else
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#define vdev_bdev_invalidate(bdev) invalidate_bdev(bdev, 1)
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#endif /* HAVE_1ARG_INVALIDATE_BDEV */
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/*
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* 2.6.27 API change
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* The function was exported for use, prior to this it existed by the
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* symbol was not exported.
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*/
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#ifndef HAVE_LOOKUP_BDEV
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#define lookup_bdev(path) ERR_PTR(-ENOTSUP)
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#endif
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/*
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* 2.6.30 API change
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* To ensure good performance preferentially use the physical block size
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* for proper alignment. The physical size is supposed to be the internal
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* sector size used by the device. This is often 4096 byte for AF devices,
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* while a smaller 512 byte logical size is supported for compatibility.
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*
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* Unfortunately, many drives still misreport their physical sector size.
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* For devices which are known to lie you may need to manually set this
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* at pool creation time with 'zpool create -o ashift=12 ...'.
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*
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* When the physical block size interface isn't available, we fall back to
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* the logical block size interface and then the older hard sector size.
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*/
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#ifdef HAVE_BDEV_PHYSICAL_BLOCK_SIZE
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#define vdev_bdev_block_size(bdev) bdev_physical_block_size(bdev)
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#else
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#ifdef HAVE_BDEV_LOGICAL_BLOCK_SIZE
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#define vdev_bdev_block_size(bdev) bdev_logical_block_size(bdev)
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#else
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#define vdev_bdev_block_size(bdev) bdev_hardsect_size(bdev)
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#endif /* HAVE_BDEV_LOGICAL_BLOCK_SIZE */
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#endif /* HAVE_BDEV_PHYSICAL_BLOCK_SIZE */
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/*
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* 2.6.37 API change
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* The WRITE_FLUSH, WRITE_FUA, and WRITE_FLUSH_FUA flags have been
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* introduced as a replacement for WRITE_BARRIER. This was done to
|
|
* allow richer semantics to be expressed to the block layer. It is
|
|
* the block layers responsibility to choose the correct way to
|
|
* implement these semantics.
|
|
*
|
|
* The existence of these flags implies that REQ_FLUSH an REQ_FUA are
|
|
* defined. Thus we can safely define VDEV_REQ_FLUSH and VDEV_REQ_FUA
|
|
* compatibility macros.
|
|
*/
|
|
#ifdef WRITE_FLUSH_FUA
|
|
#define VDEV_WRITE_FLUSH_FUA WRITE_FLUSH_FUA
|
|
#define VDEV_REQ_FLUSH REQ_FLUSH
|
|
#define VDEV_REQ_FUA REQ_FUA
|
|
#else
|
|
#define VDEV_WRITE_FLUSH_FUA WRITE_BARRIER
|
|
#define VDEV_REQ_FLUSH REQ_HARDBARRIER
|
|
#define VDEV_REQ_FUA REQ_HARDBARRIER
|
|
#endif
|
|
|
|
/*
|
|
* 2.6.32 API change
|
|
* Use the normal I/O patch for discards.
|
|
*/
|
|
#ifdef REQ_DISCARD
|
|
#define VDEV_REQ_DISCARD REQ_DISCARD
|
|
#endif
|
|
|
|
/*
|
|
* 2.6.33 API change
|
|
* Discard granularity and alignment restrictions may now be set. For
|
|
* older kernels which do not support this it is safe to skip it.
|
|
*/
|
|
#ifdef HAVE_DISCARD_GRANULARITY
|
|
static inline void
|
|
blk_queue_discard_granularity(struct request_queue *q, unsigned int dg)
|
|
{
|
|
q->limits.discard_granularity = dg;
|
|
}
|
|
#else
|
|
#define blk_queue_discard_granularity(x, dg) ((void)0)
|
|
#endif /* HAVE_DISCARD_GRANULARITY */
|
|
|
|
/*
|
|
* Default Linux IO Scheduler,
|
|
* Setting the scheduler to noop will allow the Linux IO scheduler to
|
|
* still perform front and back merging, while leaving the request
|
|
* ordering and prioritization to the ZFS IO scheduler.
|
|
*/
|
|
#define VDEV_SCHEDULER "noop"
|
|
|
|
/*
|
|
* A common holder for vdev_bdev_open() is used to relax the exclusive open
|
|
* semantics slightly. Internal vdev disk callers may pass VDEV_HOLDER to
|
|
* allow them to open the device multiple times. Other kernel callers and
|
|
* user space processes which don't pass this value will get EBUSY. This is
|
|
* currently required for the correct operation of hot spares.
|
|
*/
|
|
#define VDEV_HOLDER ((void *)0x2401de7)
|
|
|
|
#endif /* _ZFS_BLKDEV_H */
|