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mirror_zfs/include/os/linux/kernel/linux/blkdev_compat.h
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Brian Behlendorf ad8dc99ed2 Linux 5.15 compat: block device readahead 
The 5.15 kernel moved the backing_dev_info structure out of
the request queue structure which causes a build failure.

Rather than look in the new location for the BDI we instead
detect this upstream refactoring by the existance of either
the blk_queue_update_readahead() or disk_update_readahead()
functions.  In either case, there's no longer any reason to
manually set the ra_pages value since it will be overridden
with a reasonable default (2x the block size) when
blk_queue_io_opt() is called.

Therefore, we update the compatibility wrapper to do nothing
for 5.9 and newer kernels.  While it's tempting to do the
same for older kernels we want to keep the compatibility
code to preserve the existing behavior.  Removing it would
effectively increase the default readahead to 128k.

Reviewed-by: Tony Nguyen <tony.nguyen@delphix.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #12532
2021-09-14 15:41:42 -07:00

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/*
* 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>
#include <linux/backing-dev.h>
#include <linux/hdreg.h>
#include <linux/msdos_fs.h> /* for SECTOR_* */
#ifndef HAVE_BLK_QUEUE_FLAG_SET
static inline void
blk_queue_flag_set(unsigned int flag, struct request_queue *q)
{
queue_flag_set(flag, q);
}
#endif
#ifndef HAVE_BLK_QUEUE_FLAG_CLEAR
static inline void
blk_queue_flag_clear(unsigned int flag, struct request_queue *q)
{
queue_flag_clear(flag, q);
}
#endif
/*
* 4.7 API,
* The blk_queue_write_cache() interface has replaced blk_queue_flush()
* interface. However, the new interface is GPL-only thus we implement
* our own trivial wrapper when the GPL-only version is detected.
*
* 2.6.36 - 4.6 API,
* The blk_queue_flush() interface has replaced blk_queue_ordered()
* interface. However, while the old interface was available to all the
* new one is GPL-only. Thus if the GPL-only version is detected we
* implement our own trivial helper.
*/
static inline void
blk_queue_set_write_cache(struct request_queue *q, bool wc, bool fua)
{
#if defined(HAVE_BLK_QUEUE_WRITE_CACHE_GPL_ONLY)
if (wc)
blk_queue_flag_set(QUEUE_FLAG_WC, q);
else
blk_queue_flag_clear(QUEUE_FLAG_WC, q);
if (fua)
blk_queue_flag_set(QUEUE_FLAG_FUA, q);
else
blk_queue_flag_clear(QUEUE_FLAG_FUA, q);
#elif defined(HAVE_BLK_QUEUE_WRITE_CACHE)
blk_queue_write_cache(q, wc, fua);
#elif defined(HAVE_BLK_QUEUE_FLUSH_GPL_ONLY)
if (wc)
q->flush_flags |= REQ_FLUSH;
if (fua)
q->flush_flags |= REQ_FUA;
#elif defined(HAVE_BLK_QUEUE_FLUSH)
blk_queue_flush(q, (wc ? REQ_FLUSH : 0) | (fua ? REQ_FUA : 0));
#else
#error "Unsupported kernel"
#endif
}
static inline void
blk_queue_set_read_ahead(struct request_queue *q, unsigned long ra_pages)
{
#if !defined(HAVE_BLK_QUEUE_UPDATE_READAHEAD) && \
!defined(HAVE_DISK_UPDATE_READAHEAD)
#ifdef HAVE_BLK_QUEUE_BDI_DYNAMIC
q->backing_dev_info->ra_pages = ra_pages;
#else
q->backing_dev_info.ra_pages = ra_pages;
#endif
#endif
}
#ifdef HAVE_BIO_BVEC_ITER
#define BIO_BI_SECTOR(bio) (bio)->bi_iter.bi_sector
#define BIO_BI_SIZE(bio) (bio)->bi_iter.bi_size
#define BIO_BI_IDX(bio) (bio)->bi_iter.bi_idx
#define BIO_BI_SKIP(bio) (bio)->bi_iter.bi_bvec_done
#define bio_for_each_segment4(bv, bvp, b, i) \
bio_for_each_segment((bv), (b), (i))
typedef struct bvec_iter bvec_iterator_t;
#else
#define BIO_BI_SECTOR(bio) (bio)->bi_sector
#define BIO_BI_SIZE(bio) (bio)->bi_size
#define BIO_BI_IDX(bio) (bio)->bi_idx
#define BIO_BI_SKIP(bio) (0)
#define bio_for_each_segment4(bv, bvp, b, i) \
bio_for_each_segment((bvp), (b), (i))
typedef int bvec_iterator_t;
#endif
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 */
*flags |= REQ_FAILFAST_MASK;
}
/*
* Maximum disk label length, it may be undefined for some kernels.
*/
#if !defined(DISK_NAME_LEN)
#define DISK_NAME_LEN 32
#endif /* DISK_NAME_LEN */
#ifdef HAVE_BIO_BI_STATUS
static inline int
bi_status_to_errno(blk_status_t status)
{
switch (status) {
case BLK_STS_OK:
return (0);
case BLK_STS_NOTSUPP:
return (EOPNOTSUPP);
case BLK_STS_TIMEOUT:
return (ETIMEDOUT);
case BLK_STS_NOSPC:
return (ENOSPC);
case BLK_STS_TRANSPORT:
return (ENOLINK);
case BLK_STS_TARGET:
return (EREMOTEIO);
case BLK_STS_NEXUS:
return (EBADE);
case BLK_STS_MEDIUM:
return (ENODATA);
case BLK_STS_PROTECTION:
return (EILSEQ);
case BLK_STS_RESOURCE:
return (ENOMEM);
case BLK_STS_AGAIN:
return (EAGAIN);
case BLK_STS_IOERR:
return (EIO);
default:
return (EIO);
}
}
static inline blk_status_t
errno_to_bi_status(int error)
{
switch (error) {
case 0:
return (BLK_STS_OK);
case EOPNOTSUPP:
return (BLK_STS_NOTSUPP);
case ETIMEDOUT:
return (BLK_STS_TIMEOUT);
case ENOSPC:
return (BLK_STS_NOSPC);
case ENOLINK:
return (BLK_STS_TRANSPORT);
case EREMOTEIO:
return (BLK_STS_TARGET);
case EBADE:
return (BLK_STS_NEXUS);
case ENODATA:
return (BLK_STS_MEDIUM);
case EILSEQ:
return (BLK_STS_PROTECTION);
case ENOMEM:
return (BLK_STS_RESOURCE);
case EAGAIN:
return (BLK_STS_AGAIN);
case EIO:
return (BLK_STS_IOERR);
default:
return (BLK_STS_IOERR);
}
}
#endif /* HAVE_BIO_BI_STATUS */
/*
* 4.3 API change
* The bio_endio() prototype changed slightly. These are helper
* macro's to ensure the prototype and invocation are handled.
*/
#ifdef HAVE_1ARG_BIO_END_IO_T
#ifdef HAVE_BIO_BI_STATUS
#define BIO_END_IO_ERROR(bio) bi_status_to_errno(bio->bi_status)
#define BIO_END_IO_PROTO(fn, x, z) static void fn(struct bio *x)
#define BIO_END_IO(bio, error) bio_set_bi_status(bio, error)
static inline void
bio_set_bi_status(struct bio *bio, int error)
{
ASSERT3S(error, <=, 0);
bio->bi_status = errno_to_bi_status(-error);
bio_endio(bio);
}
#else
#define BIO_END_IO_ERROR(bio) (-(bio->bi_error))
#define BIO_END_IO_PROTO(fn, x, z) static void fn(struct bio *x)
#define BIO_END_IO(bio, error) bio_set_bi_error(bio, error)
static inline void
bio_set_bi_error(struct bio *bio, int error)
{
ASSERT3S(error, <=, 0);
bio->bi_error = error;
bio_endio(bio);
}
#endif /* HAVE_BIO_BI_STATUS */
#else
#define BIO_END_IO_PROTO(fn, x, z) static void fn(struct bio *x, int z)
#define BIO_END_IO(bio, error) bio_endio(bio, error);
#endif /* HAVE_1ARG_BIO_END_IO_T */
/*
* 4.1 API,
* 3.10.0 CentOS 7.x API,
* blkdev_reread_part()
*
* For older kernels trigger a re-reading of the partition table by calling
* check_disk_change() which calls flush_disk() to invalidate the device.
*
* For newer kernels (as of 5.10), bdev_check_media_change is used, in favor of
* check_disk_change(), with the modification that invalidation is no longer
* forced.
*/
#ifdef HAVE_CHECK_DISK_CHANGE
#define zfs_check_media_change(bdev) check_disk_change(bdev)
#ifdef HAVE_BLKDEV_REREAD_PART
#define vdev_bdev_reread_part(bdev) blkdev_reread_part(bdev)
#else
#define vdev_bdev_reread_part(bdev) check_disk_change(bdev)
#endif /* HAVE_BLKDEV_REREAD_PART */
#else
#ifdef HAVE_BDEV_CHECK_MEDIA_CHANGE
static inline int
zfs_check_media_change(struct block_device *bdev)
{
#ifdef HAVE_BLOCK_DEVICE_OPERATIONS_REVALIDATE_DISK
struct gendisk *gd = bdev->bd_disk;
const struct block_device_operations *bdo = gd->fops;
#endif
if (!bdev_check_media_change(bdev))
return (0);
#ifdef HAVE_BLOCK_DEVICE_OPERATIONS_REVALIDATE_DISK
/*
* Force revalidation, to mimic the old behavior of
* check_disk_change()
*/
if (bdo->revalidate_disk)
bdo->revalidate_disk(gd);
#endif
return (0);
}
#define vdev_bdev_reread_part(bdev) zfs_check_media_change(bdev)
#else
/*
* This is encountered if check_disk_change() and bdev_check_media_change()
* are not available in the kernel - likely due to an API change that needs
* to be chased down.
*/
#error "Unsupported kernel: no usable disk change check"
#endif /* HAVE_BDEV_CHECK_MEDIA_CHANGE */
#endif /* HAVE_CHECK_DISK_CHANGE */
/*
* 2.6.27 API change
* The function was exported for use, prior to this it existed but the
* symbol was not exported.
*
* 4.4.0-6.21 API change for Ubuntu
* lookup_bdev() gained a second argument, FMODE_*, to check inode permissions.
*
* 5.11 API change
* Changed to take a dev_t argument which is set on success and return a
* non-zero error code on failure.
*/
static inline int
vdev_lookup_bdev(const char *path, dev_t *dev)
{
#if defined(HAVE_DEVT_LOOKUP_BDEV)
return (lookup_bdev(path, dev));
#elif defined(HAVE_1ARG_LOOKUP_BDEV)
struct block_device *bdev = lookup_bdev(path);
if (IS_ERR(bdev))
return (PTR_ERR(bdev));
*dev = bdev->bd_dev;
bdput(bdev);
return (0);
#elif defined(HAVE_MODE_LOOKUP_BDEV)
struct block_device *bdev = lookup_bdev(path, FMODE_READ);
if (IS_ERR(bdev))
return (PTR_ERR(bdev));
*dev = bdev->bd_dev;
bdput(bdev);
return (0);
#else
#error "Unsupported kernel"
#endif
}
/*
* Kernels without bio_set_op_attrs use bi_rw for the bio flags.
*/
#if !defined(HAVE_BIO_SET_OP_ATTRS)
static inline void
bio_set_op_attrs(struct bio *bio, unsigned rw, unsigned flags)
{
bio->bi_rw |= rw | flags;
}
#endif
/*
* bio_set_flush - Set the appropriate flags in a bio to guarantee
* data are on non-volatile media on completion.
*
* 2.6.37 - 4.8 API,
* Introduce WRITE_FLUSH, WRITE_FUA, and WRITE_FLUSH_FUA flags as a
* replacement for WRITE_BARRIER to allow expressing richer semantics
* to the block layer. It's up to the block layer to implement the
* semantics correctly. Use the WRITE_FLUSH_FUA flag combination.
*
* 4.8 - 4.9 API,
* REQ_FLUSH was renamed to REQ_PREFLUSH. For consistency with previous
* OpenZFS releases, prefer the WRITE_FLUSH_FUA flag set if it's available.
*
* 4.10 API,
* 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(HAVE_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);
#else
#error "Allowing the build will cause bio_set_flush requests to be ignored."
#endif
}
/*
* 4.8 API,
* REQ_OP_FLUSH
*
* 4.8-rc0 - 4.8-rc1,
* REQ_PREFLUSH
*
* 2.6.36 - 4.7 API,
* REQ_FLUSH
*
* 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(HAVE_REQ_PREFLUSH) && defined(HAVE_BIO_BI_OPF)
return (bio->bi_opf & REQ_PREFLUSH);
#elif defined(HAVE_REQ_PREFLUSH) && !defined(HAVE_BIO_BI_OPF)
return (bio->bi_rw & REQ_PREFLUSH);
#elif defined(HAVE_REQ_FLUSH)
return (bio->bi_rw & REQ_FLUSH);
#else
#error "Unsupported kernel"
#endif
}
/*
* 4.8 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 API,
* REQ_OP_DISCARD
*
* 2.6.36 - 4.7 API,
* REQ_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.
*/
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_REQ_DISCARD)
return (bio->bi_rw & REQ_DISCARD);
#else
#error "Unsupported kernel"
#endif
}
/*
* 4.8 API,
* REQ_OP_SECURE_ERASE
*
* 2.6.36 - 4.7 API,
* REQ_SECURE
*/
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.
*/
static inline void
blk_queue_discard_granularity(struct request_queue *q, unsigned int dg)
{
q->limits.discard_granularity = dg;
}
/*
* 4.8 API,
* blk_queue_secure_erase()
*
* 2.6.36 - 4.7 API,
* blk_queue_secdiscard()
*/
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
}
/*
* 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 unsigned long
blk_generic_start_io_acct(struct request_queue *q __attribute__((unused)),
struct gendisk *disk __attribute__((unused)),
int rw __attribute__((unused)), struct bio *bio)
{
#if defined(HAVE_DISK_IO_ACCT)
return (disk_start_io_acct(disk, bio_sectors(bio), bio_op(bio)));
#elif defined(HAVE_BIO_IO_ACCT)
return (bio_start_io_acct(bio));
#elif defined(HAVE_GENERIC_IO_ACCT_3ARG)
unsigned long start_time = jiffies;
generic_start_io_acct(rw, bio_sectors(bio), &disk->part0);
return (start_time);
#elif defined(HAVE_GENERIC_IO_ACCT_4ARG)
unsigned long start_time = jiffies;
generic_start_io_acct(q, rw, bio_sectors(bio), &disk->part0);
return (start_time);
#else
/* Unsupported */
return (0);
#endif
}
static inline void
blk_generic_end_io_acct(struct request_queue *q __attribute__((unused)),
struct gendisk *disk __attribute__((unused)),
int rw __attribute__((unused)), struct bio *bio, unsigned long start_time)
{
#if defined(HAVE_DISK_IO_ACCT)
disk_end_io_acct(disk, bio_op(bio), start_time);
#elif defined(HAVE_BIO_IO_ACCT)
bio_end_io_acct(bio, start_time);
#elif defined(HAVE_GENERIC_IO_ACCT_3ARG)
generic_end_io_acct(rw, &disk->part0, start_time);
#elif defined(HAVE_GENERIC_IO_ACCT_4ARG)
generic_end_io_acct(q, rw, &disk->part0, start_time);
#endif
}
#ifndef HAVE_SUBMIT_BIO_IN_BLOCK_DEVICE_OPERATIONS
static inline struct request_queue *
blk_generic_alloc_queue(make_request_fn make_request, int node_id)
{
#if defined(HAVE_BLK_ALLOC_QUEUE_REQUEST_FN)
return (blk_alloc_queue(make_request, node_id));
#elif defined(HAVE_BLK_ALLOC_QUEUE_REQUEST_FN_RH)
return (blk_alloc_queue_rh(make_request, node_id));
#else
struct request_queue *q = blk_alloc_queue(GFP_KERNEL);
if (q != NULL)
blk_queue_make_request(q, make_request);
return (q);
#endif
}
#endif /* !HAVE_SUBMIT_BIO_IN_BLOCK_DEVICE_OPERATIONS */
#endif /* _ZFS_BLKDEV_H */
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