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Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/…
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…git/shli/md into for-linus

Pull the pending 4.21 changes for md from Shaohua.

* 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/shli/md:
  md: fix raid10 hang issue caused by barrier
  raid10: refactor common wait code from regular read/write request
  md: remvoe redundant condition check
  lib/raid6: add option to skip algo benchmarking
  lib/raid6: sort algos in rough performance order
  lib/raid6: check for assembler SSSE3 support
  lib/raid6: avoid __attribute_const__ redefinition
  lib/raid6: add missing include for raid6test
  md: remove set but not used variable 'bi_rdev'
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@axboe
axboe committed Jan 3, 2019
2 parents 645ff1e + e820d55 commit dc629c2
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Showing 6 changed files with 94 additions and 96 deletions.
14 changes: 4 additions & 10 deletions drivers/md/md.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2147,14 +2147,12 @@ EXPORT_SYMBOL(md_integrity_register);
*/
int md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev)
{
struct blk_integrity *bi_rdev;
struct blk_integrity *bi_mddev;
char name[BDEVNAME_SIZE];

if (!mddev->gendisk)
return 0;

bi_rdev = bdev_get_integrity(rdev->bdev);
bi_mddev = blk_get_integrity(mddev->gendisk);

if (!bi_mddev) /* nothing to do */
Expand Down Expand Up @@ -5693,14 +5691,10 @@ int md_run(struct mddev *mddev)
return 0;

abort:
if (mddev->flush_bio_pool) {
mempool_destroy(mddev->flush_bio_pool);
mddev->flush_bio_pool = NULL;
}
if (mddev->flush_pool){
mempool_destroy(mddev->flush_pool);
mddev->flush_pool = NULL;
}
mempool_destroy(mddev->flush_bio_pool);
mddev->flush_bio_pool = NULL;
mempool_destroy(mddev->flush_pool);
mddev->flush_pool = NULL;

return err;
}
Expand Down
76 changes: 29 additions & 47 deletions drivers/md/raid10.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1124,6 +1124,29 @@ static void raid10_unplug(struct blk_plug_cb *cb, bool from_schedule)
kfree(plug);
}

/*
* 1. Register the new request and wait if the reconstruction thread has put
* up a bar for new requests. Continue immediately if no resync is active
* currently.
* 2. If IO spans the reshape position. Need to wait for reshape to pass.
*/
static void regular_request_wait(struct mddev *mddev, struct r10conf *conf,
struct bio *bio, sector_t sectors)
{
wait_barrier(conf);
while (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
bio->bi_iter.bi_sector < conf->reshape_progress &&
bio->bi_iter.bi_sector + sectors > conf->reshape_progress) {
raid10_log(conf->mddev, "wait reshape");
allow_barrier(conf);
wait_event(conf->wait_barrier,
conf->reshape_progress <= bio->bi_iter.bi_sector ||
conf->reshape_progress >= bio->bi_iter.bi_sector +
sectors);
wait_barrier(conf);
}
}

static void raid10_read_request(struct mddev *mddev, struct bio *bio,
struct r10bio *r10_bio)
{
Expand All @@ -1132,7 +1155,6 @@ static void raid10_read_request(struct mddev *mddev, struct bio *bio,
const int op = bio_op(bio);
const unsigned long do_sync = (bio->bi_opf & REQ_SYNC);
int max_sectors;
sector_t sectors;
struct md_rdev *rdev;
char b[BDEVNAME_SIZE];
int slot = r10_bio->read_slot;
Expand Down Expand Up @@ -1166,30 +1188,8 @@ static void raid10_read_request(struct mddev *mddev, struct bio *bio,
}
rcu_read_unlock();
}
/*
* Register the new request and wait if the reconstruction
* thread has put up a bar for new requests.
* Continue immediately if no resync is active currently.
*/
wait_barrier(conf);

sectors = r10_bio->sectors;
while (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
bio->bi_iter.bi_sector < conf->reshape_progress &&
bio->bi_iter.bi_sector + sectors > conf->reshape_progress) {
/*
* IO spans the reshape position. Need to wait for reshape to
* pass
*/
raid10_log(conf->mddev, "wait reshape");
allow_barrier(conf);
wait_event(conf->wait_barrier,
conf->reshape_progress <= bio->bi_iter.bi_sector ||
conf->reshape_progress >= bio->bi_iter.bi_sector +
sectors);
wait_barrier(conf);
}

regular_request_wait(mddev, conf, bio, r10_bio->sectors);
rdev = read_balance(conf, r10_bio, &max_sectors);
if (!rdev) {
if (err_rdev) {
Expand All @@ -1209,7 +1209,9 @@ static void raid10_read_request(struct mddev *mddev, struct bio *bio,
struct bio *split = bio_split(bio, max_sectors,
gfp, &conf->bio_split);
bio_chain(split, bio);
allow_barrier(conf);
generic_make_request(bio);
wait_barrier(conf);
bio = split;
r10_bio->master_bio = bio;
r10_bio->sectors = max_sectors;
Expand Down Expand Up @@ -1332,30 +1334,8 @@ static void raid10_write_request(struct mddev *mddev, struct bio *bio,
finish_wait(&conf->wait_barrier, &w);
}

/*
* Register the new request and wait if the reconstruction
* thread has put up a bar for new requests.
* Continue immediately if no resync is active currently.
*/
wait_barrier(conf);

sectors = r10_bio->sectors;
while (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
bio->bi_iter.bi_sector < conf->reshape_progress &&
bio->bi_iter.bi_sector + sectors > conf->reshape_progress) {
/*
* IO spans the reshape position. Need to wait for reshape to
* pass
*/
raid10_log(conf->mddev, "wait reshape");
allow_barrier(conf);
wait_event(conf->wait_barrier,
conf->reshape_progress <= bio->bi_iter.bi_sector ||
conf->reshape_progress >= bio->bi_iter.bi_sector +
sectors);
wait_barrier(conf);
}

regular_request_wait(mddev, conf, bio, sectors);
if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
(mddev->reshape_backwards
? (bio->bi_iter.bi_sector < conf->reshape_safe &&
Expand Down Expand Up @@ -1514,7 +1494,9 @@ static void raid10_write_request(struct mddev *mddev, struct bio *bio,
struct bio *split = bio_split(bio, r10_bio->sectors,
GFP_NOIO, &conf->bio_split);
bio_chain(split, bio);
allow_barrier(conf);
generic_make_request(bio);
wait_barrier(conf);
bio = split;
r10_bio->master_bio = bio;
}
Expand Down
8 changes: 7 additions & 1 deletion include/linux/raid/pq.h
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Original file line number Diff line number Diff line change
Expand Up @@ -35,6 +35,7 @@ extern const char raid6_empty_zero_page[PAGE_SIZE];
#include <limits.h>
#include <stddef.h>
#include <sys/mman.h>
#include <sys/time.h>
#include <sys/types.h>

/* Not standard, but glibc defines it */
Expand All @@ -52,7 +53,9 @@ extern const char raid6_empty_zero_page[PAGE_SIZE];

#define __init
#define __exit
#define __attribute_const__ __attribute__((const))
#ifndef __attribute_const__
# define __attribute_const__ __attribute__((const))
#endif
#define noinline __attribute__((noinline))

#define preempt_enable()
Expand All @@ -67,6 +70,9 @@ extern const char raid6_empty_zero_page[PAGE_SIZE];
#define MODULE_DESCRIPTION(desc)
#define subsys_initcall(x)
#define module_exit(x)

#define IS_ENABLED(x) (x)
#define CONFIG_RAID6_PQ_BENCHMARK 1
#endif /* __KERNEL__ */

/* Routine choices */
Expand Down
8 changes: 8 additions & 0 deletions lib/Kconfig
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,14 @@ menu "Library routines"
config RAID6_PQ
tristate

config RAID6_PQ_BENCHMARK
bool "Automatically choose fastest RAID6 PQ functions"
depends on RAID6_PQ
default y
help
Benchmark all available RAID6 PQ functions on init and choose the
fastest one.

config BITREVERSE
tristate

Expand Down
81 changes: 43 additions & 38 deletions lib/raid6/algos.c
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Original file line number Diff line number Diff line change
Expand Up @@ -34,64 +34,64 @@ struct raid6_calls raid6_call;
EXPORT_SYMBOL_GPL(raid6_call);

const struct raid6_calls * const raid6_algos[] = {
#if defined(__ia64__)
&raid6_intx16,
&raid6_intx32,
#endif
#if defined(__i386__) && !defined(__arch_um__)
&raid6_mmxx1,
&raid6_mmxx2,
&raid6_sse1x1,
&raid6_sse1x2,
&raid6_sse2x1,
&raid6_sse2x2,
#ifdef CONFIG_AS_AVX2
&raid6_avx2x1,
&raid6_avx2x2,
#endif
#ifdef CONFIG_AS_AVX512
&raid6_avx512x1,
&raid6_avx512x2,
&raid6_avx512x1,
#endif
#endif
#if defined(__x86_64__) && !defined(__arch_um__)
&raid6_sse2x1,
&raid6_sse2x2,
&raid6_sse2x4,
#ifdef CONFIG_AS_AVX2
&raid6_avx2x1,
&raid6_avx2x2,
&raid6_avx2x4,
&raid6_avx2x1,
#endif
&raid6_sse2x2,
&raid6_sse2x1,
&raid6_sse1x2,
&raid6_sse1x1,
&raid6_mmxx2,
&raid6_mmxx1,
#endif
#if defined(__x86_64__) && !defined(__arch_um__)
#ifdef CONFIG_AS_AVX512
&raid6_avx512x1,
&raid6_avx512x2,
&raid6_avx512x4,
&raid6_avx512x2,
&raid6_avx512x1,
#endif
#ifdef CONFIG_AS_AVX2
&raid6_avx2x4,
&raid6_avx2x2,
&raid6_avx2x1,
#endif
&raid6_sse2x4,
&raid6_sse2x2,
&raid6_sse2x1,
#endif
#ifdef CONFIG_ALTIVEC
&raid6_altivec1,
&raid6_altivec2,
&raid6_altivec4,
&raid6_altivec8,
&raid6_vpermxor1,
&raid6_vpermxor2,
&raid6_vpermxor4,
&raid6_vpermxor8,
&raid6_vpermxor4,
&raid6_vpermxor2,
&raid6_vpermxor1,
&raid6_altivec8,
&raid6_altivec4,
&raid6_altivec2,
&raid6_altivec1,
#endif
#if defined(CONFIG_S390)
&raid6_s390vx8,
#endif
&raid6_intx1,
&raid6_intx2,
&raid6_intx4,
&raid6_intx8,
#ifdef CONFIG_KERNEL_MODE_NEON
&raid6_neonx1,
&raid6_neonx2,
&raid6_neonx4,
&raid6_neonx8,
&raid6_neonx4,
&raid6_neonx2,
&raid6_neonx1,
#endif
#if defined(__ia64__)
&raid6_intx32,
&raid6_intx16,
#endif
&raid6_intx8,
&raid6_intx4,
&raid6_intx2,
&raid6_intx1,
NULL
};

Expand Down Expand Up @@ -163,6 +163,11 @@ static inline const struct raid6_calls *raid6_choose_gen(
if ((*algo)->valid && !(*algo)->valid())
continue;

if (!IS_ENABLED(CONFIG_RAID6_PQ_BENCHMARK)) {
best = *algo;
break;
}

perf = 0;

preempt_disable();
Expand Down
3 changes: 3 additions & 0 deletions lib/raid6/test/Makefile
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Original file line number Diff line number Diff line change
Expand Up @@ -34,6 +34,9 @@ endif

ifeq ($(IS_X86),yes)
OBJS += mmx.o sse1.o sse2.o avx2.o recov_ssse3.o recov_avx2.o avx512.o recov_avx512.o
CFLAGS += $(shell echo "pshufb %xmm0, %xmm0" | \
gcc -c -x assembler - >&/dev/null && \
rm ./-.o && echo -DCONFIG_AS_SSSE3=1)
CFLAGS += $(shell echo "vpbroadcastb %xmm0, %ymm1" | \
gcc -c -x assembler - >&/dev/null && \
rm ./-.o && echo -DCONFIG_AS_AVX2=1)
Expand Down

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