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2404b01499
Use the bdev_physical_block_size() interface to determine the minimize write size which can be issued without incurring a read-modify-write operation. This is used to set the ashift correctly to prevent a performance penalty when using AF hard disks. Unfortunately, this interface isn't entirely reliable because it's not uncommon for disks to misreport this value. For this reason you may still need to manually set your ashift with: zpool create -o ashift=12 ... The solution to this in the upstream Illumos source was to add a white list of known offending drives. Maintaining such a list will be a burden, but it still may be worth doing if we can detect a large number of these drives. This should be considered as future work. Reported-by: Richard Yao <ryao@cs.stonybrook.edu> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #916
473 lines
14 KiB
C
473 lines
14 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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#endif /* HAVE_RQ_FOR_EACH_SEGMENT */
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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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#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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/*
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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(struct bio *x, \
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unsigned int y, 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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* 2.6.30 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
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* allow richer semantics to be expressed to the block layer. It is
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* the block layers responsibility to choose the correct way to
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* implement these semantics.
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*
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* The existence of these flags implies that REQ_FLUSH an REQ_FUA are
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* defined. Thus we can safely define VDEV_REQ_FLUSH and VDEV_REQ_FUA
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* compatibility macros.
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*/
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#ifdef WRITE_FLUSH_FUA
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# define VDEV_WRITE_FLUSH_FUA WRITE_FLUSH_FUA
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# define VDEV_REQ_FLUSH REQ_FLUSH
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# define VDEV_REQ_FUA REQ_FUA
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#else
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# define VDEV_WRITE_FLUSH_FUA WRITE_BARRIER
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# define VDEV_REQ_FLUSH REQ_HARDBARRIER
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# define VDEV_REQ_FUA REQ_HARDBARRIER
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#endif
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/*
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* 2.6.32 API change
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* Use the normal I/O patch for discards.
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*/
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#ifdef REQ_DISCARD
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# define VDEV_REQ_DISCARD REQ_DISCARD
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#endif
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/*
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* 2.6.33 API change
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* Discard granularity and alignment restrictions may now be set. For
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* older kernels which do not support this it is safe to skip it.
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*/
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#ifdef HAVE_DISCARD_GRANULARITY
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static inline void
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blk_queue_discard_granularity(struct request_queue *q, unsigned int dg)
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{
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q->limits.discard_granularity = dg;
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}
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#else
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#define blk_queue_discard_granularity(x, dg) ((void)0)
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#endif /* HAVE_DISCARD_GRANULARITY */
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|
|
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/*
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* Default Linux IO Scheduler,
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|
* Setting the scheduler to noop will allow the Linux IO scheduler to
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* still perform front and back merging, while leaving the request
|
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* ordering and prioritization to the ZFS IO scheduler.
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*/
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#define VDEV_SCHEDULER "noop"
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#endif /* _ZFS_BLKDEV_H */
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