681 lines
19 KiB
C
681 lines
19 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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#include <linux/backing-dev.h>
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#include <linux/hdreg.h>
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#include <linux/msdos_fs.h> /* for SECTOR_* */
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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_QUEUE_FLAG_SET
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static inline void
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blk_queue_flag_set(unsigned int flag, struct request_queue *q)
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{
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queue_flag_set(flag, q);
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}
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#endif
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#ifndef HAVE_BLK_QUEUE_FLAG_CLEAR
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static inline void
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blk_queue_flag_clear(unsigned int flag, struct request_queue *q)
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{
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queue_flag_clear(flag, q);
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}
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#endif
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/*
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* 4.7 - 4.x API,
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* The blk_queue_write_cache() interface has replaced blk_queue_flush()
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* interface. However, the new interface is GPL-only thus we implement
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* our own trivial wrapper when the GPL-only version is detected.
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*
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* 2.6.36 - 4.6 API,
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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.
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*
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* 2.6.x - 2.6.35
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* Legacy blk_queue_ordered() interface.
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*/
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static inline void
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blk_queue_set_write_cache(struct request_queue *q, bool wc, bool fua)
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{
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#if defined(HAVE_BLK_QUEUE_WRITE_CACHE_GPL_ONLY)
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if (wc)
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blk_queue_flag_set(QUEUE_FLAG_WC, q);
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else
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blk_queue_flag_clear(QUEUE_FLAG_WC, q);
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if (fua)
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blk_queue_flag_set(QUEUE_FLAG_FUA, q);
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else
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blk_queue_flag_clear(QUEUE_FLAG_FUA, q);
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#elif defined(HAVE_BLK_QUEUE_WRITE_CACHE)
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blk_queue_write_cache(q, wc, fua);
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#elif defined(HAVE_BLK_QUEUE_FLUSH_GPL_ONLY)
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if (wc)
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q->flush_flags |= REQ_FLUSH;
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if (fua)
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q->flush_flags |= REQ_FUA;
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#elif defined(HAVE_BLK_QUEUE_FLUSH)
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blk_queue_flush(q, (wc ? REQ_FLUSH : 0) | (fua ? REQ_FUA : 0));
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#else
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blk_queue_ordered(q, QUEUE_ORDERED_DRAIN, NULL);
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#endif
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}
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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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* 2.6.34 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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static inline void
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blk_queue_set_read_ahead(struct request_queue *q, unsigned long ra_pages)
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{
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#ifdef HAVE_BLK_QUEUE_BDI_DYNAMIC
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q->backing_dev_info->ra_pages = ra_pages;
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#else
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q->backing_dev_info.ra_pages = ra_pages;
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#endif
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}
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#ifndef HAVE_GET_DISK_AND_MODULE
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static inline struct kobject *
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get_disk_and_module(struct gendisk *disk)
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{
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return (get_disk(disk));
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}
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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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#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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#define BIO_BI_SKIP(bio) (bio)->bi_iter.bi_bvec_done
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#define bio_for_each_segment4(bv, bvp, b, i) \
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bio_for_each_segment((bv), (b), (i))
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typedef struct bvec_iter bvec_iterator_t;
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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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#define BIO_BI_SKIP(bio) (0)
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#define bio_for_each_segment4(bv, bvp, b, i) \
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bio_for_each_segment((bvp), (b), (i))
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typedef int bvec_iterator_t;
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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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#ifdef HAVE_BIO_BI_STATUS
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static inline int
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bi_status_to_errno(blk_status_t status)
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{
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switch (status) {
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case BLK_STS_OK:
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return (0);
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case BLK_STS_NOTSUPP:
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return (EOPNOTSUPP);
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case BLK_STS_TIMEOUT:
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return (ETIMEDOUT);
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case BLK_STS_NOSPC:
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return (ENOSPC);
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case BLK_STS_TRANSPORT:
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return (ENOLINK);
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case BLK_STS_TARGET:
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return (EREMOTEIO);
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case BLK_STS_NEXUS:
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return (EBADE);
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case BLK_STS_MEDIUM:
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return (ENODATA);
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case BLK_STS_PROTECTION:
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return (EILSEQ);
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case BLK_STS_RESOURCE:
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return (ENOMEM);
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case BLK_STS_AGAIN:
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return (EAGAIN);
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case BLK_STS_IOERR:
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return (EIO);
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default:
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return (EIO);
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}
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}
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static inline blk_status_t
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errno_to_bi_status(int error)
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{
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switch (error) {
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case 0:
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return (BLK_STS_OK);
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case EOPNOTSUPP:
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return (BLK_STS_NOTSUPP);
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case ETIMEDOUT:
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return (BLK_STS_TIMEOUT);
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case ENOSPC:
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return (BLK_STS_NOSPC);
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case ENOLINK:
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return (BLK_STS_TRANSPORT);
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case EREMOTEIO:
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return (BLK_STS_TARGET);
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case EBADE:
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return (BLK_STS_NEXUS);
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case ENODATA:
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return (BLK_STS_MEDIUM);
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case EILSEQ:
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return (BLK_STS_PROTECTION);
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case ENOMEM:
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return (BLK_STS_RESOURCE);
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case EAGAIN:
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return (BLK_STS_AGAIN);
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case EIO:
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return (BLK_STS_IOERR);
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default:
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return (BLK_STS_IOERR);
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}
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}
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#endif /* HAVE_BIO_BI_STATUS */
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/*
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* 4.3 API change
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* The bio_endio() prototype changed slightly. These are helper
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* macro's to ensure the prototype and invocation are handled.
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*/
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#ifdef HAVE_1ARG_BIO_END_IO_T
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#ifdef HAVE_BIO_BI_STATUS
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#define BIO_END_IO_ERROR(bio) bi_status_to_errno(bio->bi_status)
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#define BIO_END_IO_PROTO(fn, x, z) static void fn(struct bio *x)
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#define BIO_END_IO(bio, error) bio_set_bi_status(bio, error)
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static inline void
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bio_set_bi_status(struct bio *bio, int error)
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{
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ASSERT3S(error, <=, 0);
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bio->bi_status = errno_to_bi_status(-error);
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bio_endio(bio);
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}
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#else
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#define BIO_END_IO_ERROR(bio) (-(bio->bi_error))
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#define BIO_END_IO_PROTO(fn, x, z) static void fn(struct bio *x)
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#define BIO_END_IO(bio, error) bio_set_bi_error(bio, error)
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static inline void
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bio_set_bi_error(struct bio *bio, int error)
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{
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ASSERT3S(error, <=, 0);
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bio->bi_error = error;
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bio_endio(bio);
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}
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#endif /* HAVE_BIO_BI_STATUS */
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#else
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#define BIO_END_IO_PROTO(fn, x, z) static void fn(struct bio *x, int z)
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#define BIO_END_IO(bio, error) bio_endio(bio, error);
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#endif /* HAVE_1ARG_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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* 4.1 - x.y.z API,
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* 3.10.0 CentOS 7.x API,
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* blkdev_reread_part()
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*
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* For older kernels trigger a re-reading of the partition table by calling
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* check_disk_change() which calls flush_disk() to invalidate the device.
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*/
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#ifdef HAVE_BLKDEV_REREAD_PART
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#define vdev_bdev_reread_part(bdev) blkdev_reread_part(bdev)
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#else
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#define vdev_bdev_reread_part(bdev) check_disk_change(bdev)
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#endif /* HAVE_BLKDEV_REREAD_PART */
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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 but the
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* symbol was not exported.
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*
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* 4.4.0-6.21 API change for Ubuntu
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* lookup_bdev() gained a second argument, FMODE_*, to check inode permissions.
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*/
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#ifdef HAVE_1ARG_LOOKUP_BDEV
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#define vdev_lookup_bdev(path) lookup_bdev(path)
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#else
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#ifdef HAVE_2ARGS_LOOKUP_BDEV
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#define vdev_lookup_bdev(path) lookup_bdev(path, 0)
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#else
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#define vdev_lookup_bdev(path) ERR_PTR(-ENOTSUP)
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#endif /* HAVE_2ARGS_LOOKUP_BDEV */
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#endif /* HAVE_1ARG_LOOKUP_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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#ifndef HAVE_BIO_SET_OP_ATTRS
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/*
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* Kernels without bio_set_op_attrs use bi_rw for the bio flags.
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*/
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static inline void
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bio_set_op_attrs(struct bio *bio, unsigned rw, unsigned flags)
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{
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bio->bi_rw |= rw | flags;
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}
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#endif
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/*
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* bio_set_flush - Set the appropriate flags in a bio to guarantee
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* data are on non-volatile media on completion.
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*
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* 2.6.X - 2.6.36 API,
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* WRITE_BARRIER - Tells the block layer to commit all previously submitted
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* writes to stable storage before this one is started and that the current
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* write is on stable storage upon completion. Also prevents reordering
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* on both sides of the current operation.
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*
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* 2.6.37 - 4.8 API,
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* Introduce WRITE_FLUSH, WRITE_FUA, and WRITE_FLUSH_FUA flags as a
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* replacement for WRITE_BARRIER to allow expressing richer semantics
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* to the block layer. It's up to the block layer to implement the
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* semantics correctly. Use the WRITE_FLUSH_FUA flag combination.
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*
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* 4.8 - 4.9 API,
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* REQ_FLUSH was renamed to REQ_PREFLUSH. For consistency with previous
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* ZoL releases, prefer the WRITE_FLUSH_FUA flag set if it's available.
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*
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* 4.10 API,
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|
* The read/write flags and their modifiers, including WRITE_FLUSH,
|
|
* WRITE_FUA and WRITE_FLUSH_FUA were removed from fs.h in
|
|
* torvalds/linux@70fd7614 and replaced by direct flag modification
|
|
* of the REQ_ flags in bio->bi_opf. Use REQ_PREFLUSH.
|
|
*/
|
|
static inline void
|
|
bio_set_flush(struct bio *bio)
|
|
{
|
|
#if defined(REQ_PREFLUSH) /* >= 4.10 */
|
|
bio_set_op_attrs(bio, 0, REQ_PREFLUSH);
|
|
#elif defined(WRITE_FLUSH_FUA) /* >= 2.6.37 and <= 4.9 */
|
|
bio_set_op_attrs(bio, 0, WRITE_FLUSH_FUA);
|
|
#elif defined(WRITE_BARRIER) /* < 2.6.37 */
|
|
bio_set_op_attrs(bio, 0, WRITE_BARRIER);
|
|
#else
|
|
#error "Allowing the build will cause bio_set_flush requests to be ignored."
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* 4.8 - 4.x API,
|
|
* REQ_OP_FLUSH
|
|
*
|
|
* 4.8-rc0 - 4.8-rc1,
|
|
* REQ_PREFLUSH
|
|
*
|
|
* 2.6.36 - 4.7 API,
|
|
* REQ_FLUSH
|
|
*
|
|
* 2.6.x - 2.6.35 API,
|
|
* HAVE_BIO_RW_BARRIER
|
|
*
|
|
* Used to determine if a cache flush has been requested. This check has
|
|
* been left intentionally broad in order to cover both a legacy flush
|
|
* and the new preflush behavior introduced in Linux 4.8. This is correct
|
|
* in all cases but may have a performance impact for some kernels. It
|
|
* has the advantage of minimizing kernel specific changes in the zvol code.
|
|
*
|
|
*/
|
|
static inline boolean_t
|
|
bio_is_flush(struct bio *bio)
|
|
{
|
|
#if defined(HAVE_REQ_OP_FLUSH) && defined(HAVE_BIO_BI_OPF)
|
|
return ((bio_op(bio) == REQ_OP_FLUSH) || (bio->bi_opf & REQ_PREFLUSH));
|
|
#elif defined(REQ_PREFLUSH) && defined(HAVE_BIO_BI_OPF)
|
|
return (bio->bi_opf & REQ_PREFLUSH);
|
|
#elif defined(REQ_PREFLUSH) && !defined(HAVE_BIO_BI_OPF)
|
|
return (bio->bi_rw & REQ_PREFLUSH);
|
|
#elif defined(REQ_FLUSH)
|
|
return (bio->bi_rw & REQ_FLUSH);
|
|
#elif defined(HAVE_BIO_RW_BARRIER)
|
|
return (bio->bi_rw & (1 << BIO_RW_BARRIER));
|
|
#else
|
|
#error "Allowing the build will cause flush requests to be ignored."
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* 4.8 - 4.x API,
|
|
* REQ_FUA flag moved to bio->bi_opf
|
|
*
|
|
* 2.6.x - 4.7 API,
|
|
* REQ_FUA
|
|
*/
|
|
static inline boolean_t
|
|
bio_is_fua(struct bio *bio)
|
|
{
|
|
#if defined(HAVE_BIO_BI_OPF)
|
|
return (bio->bi_opf & REQ_FUA);
|
|
#elif defined(REQ_FUA)
|
|
return (bio->bi_rw & REQ_FUA);
|
|
#else
|
|
#error "Allowing the build will cause fua requests to be ignored."
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* 4.8 - 4.x API,
|
|
* REQ_OP_DISCARD
|
|
*
|
|
* 2.6.36 - 4.7 API,
|
|
* REQ_DISCARD
|
|
*
|
|
* 2.6.28 - 2.6.35 API,
|
|
* BIO_RW_DISCARD
|
|
*
|
|
* In all cases the normal I/O path is used for discards. The only
|
|
* difference is how the kernel tags individual I/Os as discards.
|
|
*
|
|
* Note that 2.6.32 era kernels provide both BIO_RW_DISCARD and REQ_DISCARD,
|
|
* where BIO_RW_DISCARD is the correct interface. Therefore, it is important
|
|
* that the HAVE_BIO_RW_DISCARD check occur before the REQ_DISCARD check.
|
|
*/
|
|
static inline boolean_t
|
|
bio_is_discard(struct bio *bio)
|
|
{
|
|
#if defined(HAVE_REQ_OP_DISCARD)
|
|
return (bio_op(bio) == REQ_OP_DISCARD);
|
|
#elif defined(HAVE_BIO_RW_DISCARD)
|
|
return (bio->bi_rw & (1 << BIO_RW_DISCARD));
|
|
#elif defined(REQ_DISCARD)
|
|
return (bio->bi_rw & REQ_DISCARD);
|
|
#else
|
|
/* potentially triggering the DMU_MAX_ACCESS assertion. */
|
|
#error "Allowing the build will cause discard requests to become writes."
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* 4.8 - 4.x API,
|
|
* REQ_OP_SECURE_ERASE
|
|
*
|
|
* 2.6.36 - 4.7 API,
|
|
* REQ_SECURE
|
|
*
|
|
* 2.6.x - 2.6.35 API,
|
|
* Unsupported by kernel
|
|
*/
|
|
static inline boolean_t
|
|
bio_is_secure_erase(struct bio *bio)
|
|
{
|
|
#if defined(HAVE_REQ_OP_SECURE_ERASE)
|
|
return (bio_op(bio) == REQ_OP_SECURE_ERASE);
|
|
#elif defined(REQ_SECURE)
|
|
return (bio->bi_rw & REQ_SECURE);
|
|
#else
|
|
return (0);
|
|
#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 */
|
|
|
|
/*
|
|
* 2.6.32 - 4.x API,
|
|
* blk_queue_discard()
|
|
*/
|
|
#if !defined(HAVE_BLK_QUEUE_DISCARD)
|
|
#define blk_queue_discard(q) (0);
|
|
#endif
|
|
|
|
/*
|
|
* 4.8 - 4.x API,
|
|
* blk_queue_secure_erase()
|
|
*
|
|
* 2.6.36 - 4.7 API,
|
|
* blk_queue_secdiscard()
|
|
*
|
|
* 2.6.x - 2.6.35 API,
|
|
* Unsupported by kernel
|
|
*/
|
|
static inline int
|
|
blk_queue_discard_secure(struct request_queue *q)
|
|
{
|
|
#if defined(HAVE_BLK_QUEUE_SECURE_ERASE)
|
|
return (blk_queue_secure_erase(q));
|
|
#elif defined(HAVE_BLK_QUEUE_SECDISCARD)
|
|
return (blk_queue_secdiscard(q));
|
|
#else
|
|
return (0);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
|
|
static inline void
|
|
blk_generic_start_io_acct(struct request_queue *q, int rw,
|
|
unsigned long sectors, struct hd_struct *part)
|
|
{
|
|
#if defined(HAVE_GENERIC_IO_ACCT_3ARG)
|
|
generic_start_io_acct(rw, sectors, part);
|
|
#elif defined(HAVE_GENERIC_IO_ACCT_4ARG)
|
|
generic_start_io_acct(q, rw, sectors, part);
|
|
#endif
|
|
}
|
|
|
|
static inline void
|
|
blk_generic_end_io_acct(struct request_queue *q, int rw,
|
|
struct hd_struct *part, unsigned long start_time)
|
|
{
|
|
#if defined(HAVE_GENERIC_IO_ACCT_3ARG)
|
|
generic_end_io_acct(rw, part, start_time);
|
|
#elif defined(HAVE_GENERIC_IO_ACCT_4ARG)
|
|
generic_end_io_acct(q, rw, part, start_time);
|
|
#endif
|
|
}
|
|
|
|
#endif /* _ZFS_BLKDEV_H */
|