61e909608d
For legacy reasons the zvol.c and vdev_disk.c Linux compatibility code ended up in sys/blkdev.h and sys/vdev_disk.h headers. While there are worse places for this code to live it should be in a linux/blkdev_compat.h header. This change moves this block device Linux compatibility code in to the linux/blkdev_compat.h header and updates all the correct #include locations. This is not a functional change or bug fix, it is just code cleanup.
324 lines
8.9 KiB
C
324 lines
8.9 KiB
C
/*
|
|
* CDDL HEADER START
|
|
*
|
|
* The contents of this file are subject to the terms of the
|
|
* Common Development and Distribution License (the "License").
|
|
* You may not use this file except in compliance with the License.
|
|
*
|
|
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
|
|
* or http://www.opensolaris.org/os/licensing.
|
|
* See the License for the specific language governing permissions
|
|
* and limitations under the License.
|
|
*
|
|
* When distributing Covered Code, include this CDDL HEADER in each
|
|
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
|
|
* If applicable, add the following below this CDDL HEADER, with the
|
|
* fields enclosed by brackets "[]" replaced with your own identifying
|
|
* information: Portions Copyright [yyyy] [name of copyright owner]
|
|
*
|
|
* CDDL HEADER END
|
|
*/
|
|
|
|
/*
|
|
* Copyright (C) 2011 Lawrence Livermore National Security, LLC.
|
|
* Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
|
|
* Written by Brian Behlendorf <behlendorf1@llnl.gov>.
|
|
* LLNL-CODE-403049.
|
|
*/
|
|
|
|
#ifndef _ZFS_BLKDEV_H
|
|
#define _ZFS_BLKDEV_H
|
|
|
|
#include <linux/blkdev.h>
|
|
#include <linux/elevator.h>
|
|
|
|
#ifndef HAVE_FMODE_T
|
|
typedef unsigned __bitwise__ fmode_t;
|
|
#endif /* HAVE_FMODE_T */
|
|
|
|
#ifndef HAVE_BLK_FETCH_REQUEST
|
|
static inline struct request *
|
|
blk_fetch_request(struct request_queue *q)
|
|
{
|
|
struct request *req;
|
|
|
|
req = elv_next_request(q);
|
|
if (req)
|
|
blkdev_dequeue_request(req);
|
|
|
|
return req;
|
|
}
|
|
#endif /* HAVE_BLK_FETCH_REQUEST */
|
|
|
|
#ifndef HAVE_BLK_REQUEUE_REQUEST
|
|
static inline void
|
|
blk_requeue_request(request_queue_t *q, struct request *req)
|
|
{
|
|
elv_requeue_request(q, req);
|
|
}
|
|
#endif /* HAVE_BLK_REQUEUE_REQUEST */
|
|
|
|
#ifndef HAVE_BLK_END_REQUEST
|
|
static inline bool
|
|
__blk_end_request(struct request *req, int error, unsigned int nr_bytes)
|
|
{
|
|
LIST_HEAD(list);
|
|
|
|
/*
|
|
* Request has already been dequeued but 2.6.18 version of
|
|
* end_request() unconditionally dequeues the request so we
|
|
* add it to a local list to prevent hitting the BUG_ON.
|
|
*/
|
|
list_add(&req->queuelist, &list);
|
|
|
|
/*
|
|
* The old API required the driver to end each segment and not
|
|
* the entire request. In our case we always need to end the
|
|
* entire request partial requests are not supported.
|
|
*/
|
|
req->hard_cur_sectors = nr_bytes >> 9;
|
|
end_request(req, ((error == 0) ? 1 : error));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline bool
|
|
blk_end_request(struct request *req, int error, unsigned int nr_bytes)
|
|
{
|
|
struct request_queue *q = req->q;
|
|
bool rc;
|
|
|
|
spin_lock_irq(q->queue_lock);
|
|
rc = __blk_end_request(req, error, nr_bytes);
|
|
spin_unlock_irq(q->queue_lock);
|
|
|
|
return rc;
|
|
}
|
|
#else
|
|
# ifdef HAVE_BLK_END_REQUEST_GPL_ONLY
|
|
/*
|
|
* Define required to avoid conflicting 2.6.29 non-static prototype for a
|
|
* GPL-only version of the helper. As of 2.6.31 the helper is available
|
|
* to non-GPL modules and is not explicitly exported GPL-only.
|
|
*/
|
|
# define __blk_end_request __blk_end_request_x
|
|
# define blk_end_request blk_end_request_x
|
|
|
|
static inline bool
|
|
__blk_end_request_x(struct request *req, int error, unsigned int nr_bytes)
|
|
{
|
|
/*
|
|
* The old API required the driver to end each segment and not
|
|
* the entire request. In our case we always need to end the
|
|
* entire request partial requests are not supported.
|
|
*/
|
|
req->hard_cur_sectors = nr_bytes >> 9;
|
|
end_request(req, ((error == 0) ? 1 : error));
|
|
|
|
return 0;
|
|
}
|
|
static inline bool
|
|
blk_end_request_x(struct request *req, int error, unsigned int nr_bytes)
|
|
{
|
|
struct request_queue *q = req->q;
|
|
bool rc;
|
|
|
|
spin_lock_irq(q->queue_lock);
|
|
rc = __blk_end_request_x(req, error, nr_bytes);
|
|
spin_unlock_irq(q->queue_lock);
|
|
|
|
return rc;
|
|
}
|
|
# endif /* HAVE_BLK_END_REQUEST_GPL_ONLY */
|
|
#endif /* HAVE_BLK_END_REQUEST */
|
|
|
|
#ifndef HAVE_BLK_RQ_POS
|
|
static inline sector_t
|
|
blk_rq_pos(struct request *req)
|
|
{
|
|
return req->sector;
|
|
}
|
|
#endif /* HAVE_BLK_RQ_POS */
|
|
|
|
#ifndef HAVE_BLK_RQ_SECTORS
|
|
static inline unsigned int
|
|
blk_rq_sectors(struct request *req)
|
|
{
|
|
return req->nr_sectors;
|
|
}
|
|
#endif /* HAVE_BLK_RQ_SECTORS */
|
|
|
|
#if !defined(HAVE_BLK_RQ_BYTES) || defined(HAVE_BLK_RQ_BYTES_GPL_ONLY)
|
|
/*
|
|
* Define required to avoid conflicting 2.6.29 non-static prototype for a
|
|
* GPL-only version of the helper. As of 2.6.31 the helper is available
|
|
* to non-GPL modules in the form of a static inline in the header.
|
|
*/
|
|
#define blk_rq_bytes __blk_rq_bytes
|
|
static inline unsigned int
|
|
__blk_rq_bytes(struct request *req)
|
|
{
|
|
return blk_rq_sectors(req) << 9;
|
|
}
|
|
#endif /* !HAVE_BLK_RQ_BYTES || HAVE_BLK_RQ_BYTES_GPL_ONLY */
|
|
|
|
/*
|
|
* Most of the blk_* macros were removed in 2.6.36. Ostensibly this was
|
|
* done to improve readability and allow easier grepping. However, from
|
|
* a portability stand point the macros are helpful. Therefore the needed
|
|
* macros are redefined here if they are missing from the kernel.
|
|
*/
|
|
#ifndef blk_fs_request
|
|
#define blk_fs_request(rq) ((rq)->cmd_type == REQ_TYPE_FS)
|
|
#endif
|
|
|
|
#ifndef HAVE_GET_DISK_RO
|
|
static inline int
|
|
get_disk_ro(struct gendisk *disk)
|
|
{
|
|
int policy = 0;
|
|
|
|
if (disk->part[0])
|
|
policy = disk->part[0]->policy;
|
|
|
|
return policy;
|
|
}
|
|
#endif /* HAVE_GET_DISK_RO */
|
|
|
|
#ifndef HAVE_RQ_IS_SYNC
|
|
static inline bool
|
|
rq_is_sync(struct request *req)
|
|
{
|
|
return (req->flags & REQ_RW_SYNC);
|
|
}
|
|
#endif /* HAVE_RQ_IS_SYNC */
|
|
|
|
#ifndef HAVE_RQ_FOR_EACH_SEGMENT
|
|
struct req_iterator {
|
|
int i;
|
|
struct bio *bio;
|
|
};
|
|
|
|
# define for_each_bio(_bio) \
|
|
for (; _bio; _bio = _bio->bi_next)
|
|
|
|
# define __rq_for_each_bio(_bio, rq) \
|
|
if ((rq->bio)) \
|
|
for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next)
|
|
|
|
# define rq_for_each_segment(bvl, _rq, _iter) \
|
|
__rq_for_each_bio(_iter.bio, _rq) \
|
|
bio_for_each_segment(bvl, _iter.bio, _iter.i)
|
|
#endif /* HAVE_RQ_FOR_EACH_SEGMENT */
|
|
|
|
/*
|
|
* Portable helper for correctly setting the FAILFAST flags. The
|
|
* correct usage has changed 3 times from 2.6.12 to 2.6.38.
|
|
*/
|
|
static inline void
|
|
bio_set_flags_failfast(struct block_device *bdev, int *flags)
|
|
{
|
|
#ifdef CONFIG_BUG
|
|
/*
|
|
* Disable FAILFAST for loopback devices because of the
|
|
* following incorrect BUG_ON() in loop_make_request().
|
|
* This support is also disabled for md devices because the
|
|
* test suite layers md devices on top of loopback devices.
|
|
* This may be removed when the loopback driver is fixed.
|
|
*
|
|
* BUG_ON(!lo || (rw != READ && rw != WRITE));
|
|
*/
|
|
if ((MAJOR(bdev->bd_dev) == LOOP_MAJOR) ||
|
|
(MAJOR(bdev->bd_dev) == MD_MAJOR))
|
|
return;
|
|
|
|
#ifdef BLOCK_EXT_MAJOR
|
|
if (MAJOR(bdev->bd_dev) == BLOCK_EXT_MAJOR)
|
|
return;
|
|
#endif /* BLOCK_EXT_MAJOR */
|
|
#endif /* CONFIG_BUG */
|
|
|
|
#ifdef HAVE_BIO_RW_FAILFAST_DTD
|
|
/* BIO_RW_FAILFAST_* preferred interface from 2.6.28 - 2.6.35 */
|
|
*flags |=
|
|
((1 << BIO_RW_FAILFAST_DEV) |
|
|
(1 << BIO_RW_FAILFAST_TRANSPORT) |
|
|
(1 << BIO_RW_FAILFAST_DRIVER));
|
|
#else
|
|
# ifdef HAVE_BIO_RW_FAILFAST
|
|
/* BIO_RW_FAILFAST preferred interface from 2.6.12 - 2.6.27 */
|
|
*flags |= (1 << BIO_RW_FAILFAST);
|
|
# else
|
|
# ifdef HAVE_REQ_FAILFAST_MASK
|
|
/* REQ_FAILFAST_* preferred interface from 2.6.36 - 2.6.xx,
|
|
* the BIO_* and REQ_* flags were unified under REQ_* flags. */
|
|
*flags |= REQ_FAILFAST_MASK;
|
|
# endif /* HAVE_REQ_FAILFAST_MASK */
|
|
# endif /* HAVE_BIO_RW_FAILFAST */
|
|
#endif /* HAVE_BIO_RW_FAILFAST_DTD */
|
|
}
|
|
|
|
/*
|
|
* Maximum disk label length, it may be undefined for some kernels.
|
|
*/
|
|
#ifndef DISK_NAME_LEN
|
|
#define DISK_NAME_LEN 32
|
|
#endif /* DISK_NAME_LEN */
|
|
|
|
/*
|
|
* 2.6.24 API change,
|
|
* The bio_end_io() prototype changed slightly. These are helper
|
|
* macro's to ensure the prototype and return value are handled.
|
|
*/
|
|
#ifdef HAVE_2ARGS_BIO_END_IO_T
|
|
# define BIO_END_IO_PROTO(fn, x, y, z) static void fn(struct bio *x, int z)
|
|
# define BIO_END_IO_RETURN(rc) return
|
|
#else
|
|
# define BIO_END_IO_PROTO(fn, x, y, z) static int fn(struct bio *x, \
|
|
unsigned int y, int z)
|
|
# define BIO_END_IO_RETURN(rc) return rc
|
|
#endif /* HAVE_2ARGS_BIO_END_IO_T */
|
|
|
|
/*
|
|
* 2.6.28 API change
|
|
* Used to exclusively open a block device from within the kernel.
|
|
*/
|
|
#ifdef HAVE_OPEN_BDEV_EXCLUSIVE
|
|
# define vdev_bdev_open(path, md, hld) open_bdev_exclusive(path, md, hld)
|
|
# define vdev_bdev_close(bdev, md) close_bdev_exclusive(bdev, md)
|
|
#else
|
|
# define vdev_bdev_open(path, md, hld) open_bdev_excl(path, md, hld)
|
|
# define vdev_bdev_close(bdev, md) close_bdev_excl(bdev)
|
|
#endif /* HAVE_OPEN_BDEV_EXCLUSIVE */
|
|
|
|
/*
|
|
* 2.6.22 API change
|
|
* The function invalidate_bdev() lost it's second argument because
|
|
* it was unused.
|
|
*/
|
|
#ifdef HAVE_1ARG_INVALIDATE_BDEV
|
|
# define vdev_bdev_invalidate(bdev) invalidate_bdev(bdev)
|
|
#else
|
|
# define vdev_bdev_invalidate(bdev) invalidate_bdev(bdev, 1)
|
|
#endif /* HAVE_1ARG_INVALIDATE_BDEV */
|
|
|
|
/*
|
|
* 2.6.30 API change
|
|
* Change to make it explicit there this is the logical block size.
|
|
*/
|
|
#ifdef HAVE_BDEV_LOGICAL_BLOCK_SIZE
|
|
# define vdev_bdev_block_size(bdev) bdev_logical_block_size(bdev)
|
|
#else
|
|
# define vdev_bdev_block_size(bdev) bdev_hardsect_size(bdev)
|
|
#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"
|
|
|
|
#endif /* _ZFS_BLKDEV_H */
|