* [PATCH v6 03/11] bcache: remove driver private bio splitting code
[not found] <1439363241-31772-1-git-send-email-mlin@kernel.org>
@ 2015-08-12 7:07 ` Ming Lin
2016-01-08 1:53 ` Eric Wheeler
0 siblings, 1 reply; 5+ messages in thread
From: Ming Lin @ 2015-08-12 7:07 UTC (permalink / raw)
To: linux-kernel
Cc: Christoph Hellwig, Jens Axboe, Kent Overstreet, Dongsu Park,
Mike Snitzer, Martin K. Petersen, Ming Lin, linux-bcache,
Ming Lin
From: Kent Overstreet <kent.overstreet@gmail.com>
The bcache driver has always accepted arbitrarily large bios and split
them internally. Now that every driver must accept arbitrarily large
bios this code isn't nessecary anymore.
Cc: linux-bcache@vger.kernel.org
Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
[dpark: add more description in commit message]
Signed-off-by: Dongsu Park <dpark@posteo.net>
Signed-off-by: Ming Lin <ming.l@ssi.samsung.com>
---
drivers/md/bcache/bcache.h | 18 --------
drivers/md/bcache/io.c | 101 +-----------------------------------------
drivers/md/bcache/journal.c | 4 +-
drivers/md/bcache/request.c | 16 +++----
drivers/md/bcache/super.c | 32 +------------
drivers/md/bcache/util.h | 5 ++-
drivers/md/bcache/writeback.c | 4 +-
7 files changed, 18 insertions(+), 162 deletions(-)
diff --git a/drivers/md/bcache/bcache.h b/drivers/md/bcache/bcache.h
index 04f7bc2..6b420a5 100644
--- a/drivers/md/bcache/bcache.h
+++ b/drivers/md/bcache/bcache.h
@@ -243,19 +243,6 @@ struct keybuf {
DECLARE_ARRAY_ALLOCATOR(struct keybuf_key, freelist, KEYBUF_NR);
};
-struct bio_split_pool {
- struct bio_set *bio_split;
- mempool_t *bio_split_hook;
-};
-
-struct bio_split_hook {
- struct closure cl;
- struct bio_split_pool *p;
- struct bio *bio;
- bio_end_io_t *bi_end_io;
- void *bi_private;
-};
-
struct bcache_device {
struct closure cl;
@@ -288,8 +275,6 @@ struct bcache_device {
int (*cache_miss)(struct btree *, struct search *,
struct bio *, unsigned);
int (*ioctl) (struct bcache_device *, fmode_t, unsigned, unsigned long);
-
- struct bio_split_pool bio_split_hook;
};
struct io {
@@ -454,8 +439,6 @@ struct cache {
atomic_long_t meta_sectors_written;
atomic_long_t btree_sectors_written;
atomic_long_t sectors_written;
-
- struct bio_split_pool bio_split_hook;
};
struct gc_stat {
@@ -873,7 +856,6 @@ void bch_bbio_endio(struct cache_set *, struct bio *, int, const char *);
void bch_bbio_free(struct bio *, struct cache_set *);
struct bio *bch_bbio_alloc(struct cache_set *);
-void bch_generic_make_request(struct bio *, struct bio_split_pool *);
void __bch_submit_bbio(struct bio *, struct cache_set *);
void bch_submit_bbio(struct bio *, struct cache_set *, struct bkey *, unsigned);
diff --git a/drivers/md/bcache/io.c b/drivers/md/bcache/io.c
index bf6a9ca..86a0bb8 100644
--- a/drivers/md/bcache/io.c
+++ b/drivers/md/bcache/io.c
@@ -11,105 +11,6 @@
#include <linux/blkdev.h>
-static unsigned bch_bio_max_sectors(struct bio *bio)
-{
- struct request_queue *q = bdev_get_queue(bio->bi_bdev);
- struct bio_vec bv;
- struct bvec_iter iter;
- unsigned ret = 0, seg = 0;
-
- if (bio->bi_rw & REQ_DISCARD)
- return min(bio_sectors(bio), q->limits.max_discard_sectors);
-
- bio_for_each_segment(bv, bio, iter) {
- struct bvec_merge_data bvm = {
- .bi_bdev = bio->bi_bdev,
- .bi_sector = bio->bi_iter.bi_sector,
- .bi_size = ret << 9,
- .bi_rw = bio->bi_rw,
- };
-
- if (seg == min_t(unsigned, BIO_MAX_PAGES,
- queue_max_segments(q)))
- break;
-
- if (q->merge_bvec_fn &&
- q->merge_bvec_fn(q, &bvm, &bv) < (int) bv.bv_len)
- break;
-
- seg++;
- ret += bv.bv_len >> 9;
- }
-
- ret = min(ret, queue_max_sectors(q));
-
- WARN_ON(!ret);
- ret = max_t(int, ret, bio_iovec(bio).bv_len >> 9);
-
- return ret;
-}
-
-static void bch_bio_submit_split_done(struct closure *cl)
-{
- struct bio_split_hook *s = container_of(cl, struct bio_split_hook, cl);
-
- s->bio->bi_end_io = s->bi_end_io;
- s->bio->bi_private = s->bi_private;
- bio_endio(s->bio, 0);
-
- closure_debug_destroy(&s->cl);
- mempool_free(s, s->p->bio_split_hook);
-}
-
-static void bch_bio_submit_split_endio(struct bio *bio, int error)
-{
- struct closure *cl = bio->bi_private;
- struct bio_split_hook *s = container_of(cl, struct bio_split_hook, cl);
-
- if (error)
- clear_bit(BIO_UPTODATE, &s->bio->bi_flags);
-
- bio_put(bio);
- closure_put(cl);
-}
-
-void bch_generic_make_request(struct bio *bio, struct bio_split_pool *p)
-{
- struct bio_split_hook *s;
- struct bio *n;
-
- if (!bio_has_data(bio) && !(bio->bi_rw & REQ_DISCARD))
- goto submit;
-
- if (bio_sectors(bio) <= bch_bio_max_sectors(bio))
- goto submit;
-
- s = mempool_alloc(p->bio_split_hook, GFP_NOIO);
- closure_init(&s->cl, NULL);
-
- s->bio = bio;
- s->p = p;
- s->bi_end_io = bio->bi_end_io;
- s->bi_private = bio->bi_private;
- bio_get(bio);
-
- do {
- n = bio_next_split(bio, bch_bio_max_sectors(bio),
- GFP_NOIO, s->p->bio_split);
-
- n->bi_end_io = bch_bio_submit_split_endio;
- n->bi_private = &s->cl;
-
- closure_get(&s->cl);
- generic_make_request(n);
- } while (n != bio);
-
- continue_at(&s->cl, bch_bio_submit_split_done, NULL);
- return;
-submit:
- generic_make_request(bio);
-}
-
/* Bios with headers */
void bch_bbio_free(struct bio *bio, struct cache_set *c)
@@ -139,7 +40,7 @@ void __bch_submit_bbio(struct bio *bio, struct cache_set *c)
bio->bi_bdev = PTR_CACHE(c, &b->key, 0)->bdev;
b->submit_time_us = local_clock_us();
- closure_bio_submit(bio, bio->bi_private, PTR_CACHE(c, &b->key, 0));
+ closure_bio_submit(bio, bio->bi_private);
}
void bch_submit_bbio(struct bio *bio, struct cache_set *c,
diff --git a/drivers/md/bcache/journal.c b/drivers/md/bcache/journal.c
index 418607a..727ca9b 100644
--- a/drivers/md/bcache/journal.c
+++ b/drivers/md/bcache/journal.c
@@ -61,7 +61,7 @@ reread: left = ca->sb.bucket_size - offset;
bio->bi_private = &cl;
bch_bio_map(bio, data);
- closure_bio_submit(bio, &cl, ca);
+ closure_bio_submit(bio, &cl);
closure_sync(&cl);
/* This function could be simpler now since we no longer write
@@ -648,7 +648,7 @@ static void journal_write_unlocked(struct closure *cl)
spin_unlock(&c->journal.lock);
while ((bio = bio_list_pop(&list)))
- closure_bio_submit(bio, cl, c->cache[0]);
+ closure_bio_submit(bio, cl);
continue_at(cl, journal_write_done, NULL);
}
diff --git a/drivers/md/bcache/request.c b/drivers/md/bcache/request.c
index f292790..ab093a8 100644
--- a/drivers/md/bcache/request.c
+++ b/drivers/md/bcache/request.c
@@ -718,7 +718,7 @@ static void cached_dev_read_error(struct closure *cl)
/* XXX: invalidate cache */
- closure_bio_submit(bio, cl, s->d);
+ closure_bio_submit(bio, cl);
}
continue_at(cl, cached_dev_cache_miss_done, NULL);
@@ -841,7 +841,7 @@ static int cached_dev_cache_miss(struct btree *b, struct search *s,
s->cache_miss = miss;
s->iop.bio = cache_bio;
bio_get(cache_bio);
- closure_bio_submit(cache_bio, &s->cl, s->d);
+ closure_bio_submit(cache_bio, &s->cl);
return ret;
out_put:
@@ -849,7 +849,7 @@ out_put:
out_submit:
miss->bi_end_io = request_endio;
miss->bi_private = &s->cl;
- closure_bio_submit(miss, &s->cl, s->d);
+ closure_bio_submit(miss, &s->cl);
return ret;
}
@@ -914,7 +914,7 @@ static void cached_dev_write(struct cached_dev *dc, struct search *s)
if (!(bio->bi_rw & REQ_DISCARD) ||
blk_queue_discard(bdev_get_queue(dc->bdev)))
- closure_bio_submit(bio, cl, s->d);
+ closure_bio_submit(bio, cl);
} else if (s->iop.writeback) {
bch_writeback_add(dc);
s->iop.bio = bio;
@@ -929,12 +929,12 @@ static void cached_dev_write(struct cached_dev *dc, struct search *s)
flush->bi_end_io = request_endio;
flush->bi_private = cl;
- closure_bio_submit(flush, cl, s->d);
+ closure_bio_submit(flush, cl);
}
} else {
s->iop.bio = bio_clone_fast(bio, GFP_NOIO, dc->disk.bio_split);
- closure_bio_submit(bio, cl, s->d);
+ closure_bio_submit(bio, cl);
}
closure_call(&s->iop.cl, bch_data_insert, NULL, cl);
@@ -950,7 +950,7 @@ static void cached_dev_nodata(struct closure *cl)
bch_journal_meta(s->iop.c, cl);
/* If it's a flush, we send the flush to the backing device too */
- closure_bio_submit(bio, cl, s->d);
+ closure_bio_submit(bio, cl);
continue_at(cl, cached_dev_bio_complete, NULL);
}
@@ -994,7 +994,7 @@ static void cached_dev_make_request(struct request_queue *q, struct bio *bio)
!blk_queue_discard(bdev_get_queue(dc->bdev)))
bio_endio(bio, 0);
else
- bch_generic_make_request(bio, &d->bio_split_hook);
+ generic_make_request(bio);
}
}
diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index 94980bf..db70c9e 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -59,29 +59,6 @@ struct workqueue_struct *bcache_wq;
#define BTREE_MAX_PAGES (256 * 1024 / PAGE_SIZE)
-static void bio_split_pool_free(struct bio_split_pool *p)
-{
- if (p->bio_split_hook)
- mempool_destroy(p->bio_split_hook);
-
- if (p->bio_split)
- bioset_free(p->bio_split);
-}
-
-static int bio_split_pool_init(struct bio_split_pool *p)
-{
- p->bio_split = bioset_create(4, 0);
- if (!p->bio_split)
- return -ENOMEM;
-
- p->bio_split_hook = mempool_create_kmalloc_pool(4,
- sizeof(struct bio_split_hook));
- if (!p->bio_split_hook)
- return -ENOMEM;
-
- return 0;
-}
-
/* Superblock */
static const char *read_super(struct cache_sb *sb, struct block_device *bdev,
@@ -537,7 +514,7 @@ static void prio_io(struct cache *ca, uint64_t bucket, unsigned long rw)
bio->bi_private = ca;
bch_bio_map(bio, ca->disk_buckets);
- closure_bio_submit(bio, &ca->prio, ca);
+ closure_bio_submit(bio, &ca->prio);
closure_sync(cl);
}
@@ -757,7 +734,6 @@ static void bcache_device_free(struct bcache_device *d)
put_disk(d->disk);
}
- bio_split_pool_free(&d->bio_split_hook);
if (d->bio_split)
bioset_free(d->bio_split);
kvfree(d->full_dirty_stripes);
@@ -804,7 +780,6 @@ static int bcache_device_init(struct bcache_device *d, unsigned block_size,
return minor;
if (!(d->bio_split = bioset_create(4, offsetof(struct bbio, bio))) ||
- bio_split_pool_init(&d->bio_split_hook) ||
!(d->disk = alloc_disk(1))) {
ida_simple_remove(&bcache_minor, minor);
return -ENOMEM;
@@ -1793,8 +1768,6 @@ void bch_cache_release(struct kobject *kobj)
ca->set->cache[ca->sb.nr_this_dev] = NULL;
}
- bio_split_pool_free(&ca->bio_split_hook);
-
free_pages((unsigned long) ca->disk_buckets, ilog2(bucket_pages(ca)));
kfree(ca->prio_buckets);
vfree(ca->buckets);
@@ -1839,8 +1812,7 @@ static int cache_alloc(struct cache_sb *sb, struct cache *ca)
ca->sb.nbuckets)) ||
!(ca->prio_buckets = kzalloc(sizeof(uint64_t) * prio_buckets(ca) *
2, GFP_KERNEL)) ||
- !(ca->disk_buckets = alloc_bucket_pages(GFP_KERNEL, ca)) ||
- bio_split_pool_init(&ca->bio_split_hook))
+ !(ca->disk_buckets = alloc_bucket_pages(GFP_KERNEL, ca)))
return -ENOMEM;
ca->prio_last_buckets = ca->prio_buckets + prio_buckets(ca);
diff --git a/drivers/md/bcache/util.h b/drivers/md/bcache/util.h
index 1d04c48..cf2cbc2 100644
--- a/drivers/md/bcache/util.h
+++ b/drivers/md/bcache/util.h
@@ -4,6 +4,7 @@
#include <linux/blkdev.h>
#include <linux/errno.h>
+#include <linux/blkdev.h>
#include <linux/kernel.h>
#include <linux/llist.h>
#include <linux/ratelimit.h>
@@ -570,10 +571,10 @@ static inline sector_t bdev_sectors(struct block_device *bdev)
return bdev->bd_inode->i_size >> 9;
}
-#define closure_bio_submit(bio, cl, dev) \
+#define closure_bio_submit(bio, cl) \
do { \
closure_get(cl); \
- bch_generic_make_request(bio, &(dev)->bio_split_hook); \
+ generic_make_request(bio); \
} while (0)
uint64_t bch_crc64_update(uint64_t, const void *, size_t);
diff --git a/drivers/md/bcache/writeback.c b/drivers/md/bcache/writeback.c
index f1986bc..ca38362 100644
--- a/drivers/md/bcache/writeback.c
+++ b/drivers/md/bcache/writeback.c
@@ -188,7 +188,7 @@ static void write_dirty(struct closure *cl)
io->bio.bi_bdev = io->dc->bdev;
io->bio.bi_end_io = dirty_endio;
- closure_bio_submit(&io->bio, cl, &io->dc->disk);
+ closure_bio_submit(&io->bio, cl);
continue_at(cl, write_dirty_finish, system_wq);
}
@@ -208,7 +208,7 @@ static void read_dirty_submit(struct closure *cl)
{
struct dirty_io *io = container_of(cl, struct dirty_io, cl);
- closure_bio_submit(&io->bio, cl, &io->dc->disk);
+ closure_bio_submit(&io->bio, cl);
continue_at(cl, write_dirty, system_wq);
}
--
2.1.4
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: bcache: remove driver private bio splitting code
2015-08-12 7:07 ` [PATCH v6 03/11] bcache: remove driver private bio splitting code Ming Lin
@ 2016-01-08 1:53 ` Eric Wheeler
2016-01-13 2:00 ` Eric Wheeler
0 siblings, 1 reply; 5+ messages in thread
From: Eric Wheeler @ 2016-01-08 1:53 UTC (permalink / raw)
To: Kent Overstreet
Cc: Christoph Hellwig, Dongsu Park, Jens Axboe, linux-bcache,
linux-kernel, Mike Snitzer, Ming Lin, Ming Lin,
Martin K. Petersen
> From: Kent Overstreet Wed, 12 Aug 2015 00:07:13 -0700
> The bcache driver has always accepted arbitrarily large bios and split
> them internally. Now that every driver must accept arbitrarily large
> bios this code isn't nessecary anymore.
Hi Kent,
Does your patch below make any kernel version assumptions about bio
splitting? That doesn't appear so based on the commit message, but
thought I'd double-check.
If there is a kernel dependency, then, how far back should this be safe?
I'd like to apply to 3.17-rc1 like the other stable commits and stamp it
with Cc: stable@ so it will merge forward into 3.18 and onward if it fixes
my problem below:
This question comes up because I'm getting the following
(discard-related?) backtrace and would like to try the patch. If it fixes
the problem I'll stamp it with stable and get it to Jens. Note that
bch_generic_make_request() doesn't even exist after this patch, so this
backtrace would at least be simplified and possibly fixed:
[ 294.059255] [<ffffffffa049a20d>] bch_generic_make_request+0x15d/0x1f0 [bcache]
[ 294.059578] [<ffffffffa049a3b9>] __bch_submit_bbio+0x79/0x80 [bcache]
[ 294.059794] [<ffffffffa049a3eb>] bch_submit_bbio+0x2b/0x30 [bcache]
[ 294.059983] [<ffffffffa049fabb>] bch_data_insert_start+0xcb/0x5a0 [bcache]
[ 294.060169] [<ffffffffa049ffe1>] bch_data_insert+0x51/0xc0 [bcache]
[ 294.060354] [<ffffffffa04a0cc4>] cached_dev_make_request+0xbe4/0xdf0 [bcache]
[ 294.060652] [<ffffffff81317c20>] generic_make_request+0xe0/0x130
[ 294.060830] [<ffffffff81317ce7>] submit_bio+0x77/0x150
[ 294.061012] [<ffffffff81312906>] ? bio_alloc_bioset+0x1d6/0x330
[ 294.061194] [<ffffffffa04cef90>] ? le64_dec+0x20/0x20 [dm_persistent_data]
[ 294.061377] [<ffffffffa04e49be>] __blkdev_issue_discard_async.constprop.59+0x17e/0x210 [dm_thin_pool]
[ 294.061695] [<ffffffffa04e55dc>] process_prepared_discard_passdown+0x9c/0x230 [dm_thin_pool]
[ 294.062007] [<ffffffff811ac73f>] ? mempool_free+0x2f/0x90
[ 294.062207] [<ffffffffa04e0772>] process_prepared+0x92/0xc0 [dm_thin_pool]
[ 294.062404] [<ffffffffa04e5f78>] do_worker+0xb8/0x880 [dm_thin_pool]
[ 294.062606] [<ffffffff81014693>] ? __switch_to+0x1e3/0x580
[ 294.062796] [<ffffffff810dc71c>] ? put_prev_task_fair+0x2c/0x40
[ 294.062989] [<ffffffff810ba18d>] process_one_work+0x14d/0x420
[ 294.063171] [<ffffffff810ba952>] worker_thread+0x112/0x520
[ 294.063355] [<ffffffff810ba840>] ? rescuer_thread+0x3e0/0x3e0
[ 294.063560] [<ffffffff810c06a8>] kthread+0xd8/0xf0
[ 294.063737] [<ffffffff810c05d0>] ? kthread_create_on_node+0x1b0/0x1b0
[ 294.063943] [<ffffffff816e4aa2>] ret_from_fork+0x42/0x70
[ 294.064133] [<ffffffff810c05d0>] ? kthread_create_on_node+0x1b0/0x1b0
Thanks!
-Eric
> Cc: linux-bcache@vger.kernel.org
> Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
> [dpark: add more description in commit message]
> Signed-off-by: Dongsu Park <dpark@posteo.net>
> Signed-off-by: Ming Lin <ming.l@ssi.samsung.com>
> ---
> drivers/md/bcache/bcache.h | 18 --------
> drivers/md/bcache/io.c | 101 +-----------------------------------------
> drivers/md/bcache/journal.c | 4 +-
> drivers/md/bcache/request.c | 16 +++----
> drivers/md/bcache/super.c | 32 +------------
> drivers/md/bcache/util.h | 5 ++-
> drivers/md/bcache/writeback.c | 4 +-
> 7 files changed, 18 insertions(+), 162 deletions(-)
>
> diff --git a/drivers/md/bcache/bcache.h b/drivers/md/bcache/bcache.h
> index 04f7bc2..6b420a5 100644
> --- a/drivers/md/bcache/bcache.h
> +++ b/drivers/md/bcache/bcache.h
> @@ -243,19 +243,6 @@ struct keybuf {
> DECLARE_ARRAY_ALLOCATOR(struct keybuf_key, freelist, KEYBUF_NR);
> };
>
> -struct bio_split_pool {
> - struct bio_set *bio_split;
> - mempool_t *bio_split_hook;
> -};
> -
> -struct bio_split_hook {
> - struct closure cl;
> - struct bio_split_pool *p;
> - struct bio *bio;
> - bio_end_io_t *bi_end_io;
> - void *bi_private;
> -};
> -
> struct bcache_device {
> struct closure cl;
>
> @@ -288,8 +275,6 @@ struct bcache_device {
> int (*cache_miss)(struct btree *, struct search *,
> struct bio *, unsigned);
> int (*ioctl) (struct bcache_device *, fmode_t, unsigned, unsigned long);
> -
> - struct bio_split_pool bio_split_hook;
> };
>
> struct io {
> @@ -454,8 +439,6 @@ struct cache {
> atomic_long_t meta_sectors_written;
> atomic_long_t btree_sectors_written;
> atomic_long_t sectors_written;
> -
> - struct bio_split_pool bio_split_hook;
> };
>
> struct gc_stat {
> @@ -873,7 +856,6 @@ void bch_bbio_endio(struct cache_set *, struct bio *, int, const char *);
> void bch_bbio_free(struct bio *, struct cache_set *);
> struct bio *bch_bbio_alloc(struct cache_set *);
>
> -void bch_generic_make_request(struct bio *, struct bio_split_pool *);
> void __bch_submit_bbio(struct bio *, struct cache_set *);
> void bch_submit_bbio(struct bio *, struct cache_set *, struct bkey *, unsigned);
>
> diff --git a/drivers/md/bcache/io.c b/drivers/md/bcache/io.c
> index bf6a9ca..86a0bb8 100644
> --- a/drivers/md/bcache/io.c
> +++ b/drivers/md/bcache/io.c
> @@ -11,105 +11,6 @@
>
> #include <linux/blkdev.h>
>
> -static unsigned bch_bio_max_sectors(struct bio *bio)
> -{
> - struct request_queue *q = bdev_get_queue(bio->bi_bdev);
> - struct bio_vec bv;
> - struct bvec_iter iter;
> - unsigned ret = 0, seg = 0;
> -
> - if (bio->bi_rw & REQ_DISCARD)
> - return min(bio_sectors(bio), q->limits.max_discard_sectors);
> -
> - bio_for_each_segment(bv, bio, iter) {
> - struct bvec_merge_data bvm = {
> - .bi_bdev = bio->bi_bdev,
> - .bi_sector = bio->bi_iter.bi_sector,
> - .bi_size = ret << 9,
> - .bi_rw = bio->bi_rw,
> - };
> -
> - if (seg == min_t(unsigned, BIO_MAX_PAGES,
> - queue_max_segments(q)))
> - break;
> -
> - if (q->merge_bvec_fn &&
> - q->merge_bvec_fn(q, &bvm, &bv) < (int) bv.bv_len)
> - break;
> -
> - seg++;
> - ret += bv.bv_len >> 9;
> - }
> -
> - ret = min(ret, queue_max_sectors(q));
> -
> - WARN_ON(!ret);
> - ret = max_t(int, ret, bio_iovec(bio).bv_len >> 9);
> -
> - return ret;
> -}
> -
> -static void bch_bio_submit_split_done(struct closure *cl)
> -{
> - struct bio_split_hook *s = container_of(cl, struct bio_split_hook, cl);
> -
> - s->bio->bi_end_io = s->bi_end_io;
> - s->bio->bi_private = s->bi_private;
> - bio_endio(s->bio, 0);
> -
> - closure_debug_destroy(&s->cl);
> - mempool_free(s, s->p->bio_split_hook);
> -}
> -
> -static void bch_bio_submit_split_endio(struct bio *bio, int error)
> -{
> - struct closure *cl = bio->bi_private;
> - struct bio_split_hook *s = container_of(cl, struct bio_split_hook, cl);
> -
> - if (error)
> - clear_bit(BIO_UPTODATE, &s->bio->bi_flags);
> -
> - bio_put(bio);
> - closure_put(cl);
> -}
> -
> -void bch_generic_make_request(struct bio *bio, struct bio_split_pool *p)
> -{
> - struct bio_split_hook *s;
> - struct bio *n;
> -
> - if (!bio_has_data(bio) && !(bio->bi_rw & REQ_DISCARD))
> - goto submit;
> -
> - if (bio_sectors(bio) <= bch_bio_max_sectors(bio))
> - goto submit;
> -
> - s = mempool_alloc(p->bio_split_hook, GFP_NOIO);
> - closure_init(&s->cl, NULL);
> -
> - s->bio = bio;
> - s->p = p;
> - s->bi_end_io = bio->bi_end_io;
> - s->bi_private = bio->bi_private;
> - bio_get(bio);
> -
> - do {
> - n = bio_next_split(bio, bch_bio_max_sectors(bio),
> - GFP_NOIO, s->p->bio_split);
> -
> - n->bi_end_io = bch_bio_submit_split_endio;
> - n->bi_private = &s->cl;
> -
> - closure_get(&s->cl);
> - generic_make_request(n);
> - } while (n != bio);
> -
> - continue_at(&s->cl, bch_bio_submit_split_done, NULL);
> - return;
> -submit:
> - generic_make_request(bio);
> -}
> -
> /* Bios with headers */
>
> void bch_bbio_free(struct bio *bio, struct cache_set *c)
> @@ -139,7 +40,7 @@ void __bch_submit_bbio(struct bio *bio, struct cache_set *c)
> bio->bi_bdev = PTR_CACHE(c, &b->key, 0)->bdev;
>
> b->submit_time_us = local_clock_us();
> - closure_bio_submit(bio, bio->bi_private, PTR_CACHE(c, &b->key, 0));
> + closure_bio_submit(bio, bio->bi_private);
> }
>
> void bch_submit_bbio(struct bio *bio, struct cache_set *c,
> diff --git a/drivers/md/bcache/journal.c b/drivers/md/bcache/journal.c
> index 418607a..727ca9b 100644
> --- a/drivers/md/bcache/journal.c
> +++ b/drivers/md/bcache/journal.c
> @@ -61,7 +61,7 @@ reread: left = ca->sb.bucket_size - offset;
> bio->bi_private = &cl;
> bch_bio_map(bio, data);
>
> - closure_bio_submit(bio, &cl, ca);
> + closure_bio_submit(bio, &cl);
> closure_sync(&cl);
>
> /* This function could be simpler now since we no longer write
> @@ -648,7 +648,7 @@ static void journal_write_unlocked(struct closure *cl)
> spin_unlock(&c->journal.lock);
>
> while ((bio = bio_list_pop(&list)))
> - closure_bio_submit(bio, cl, c->cache[0]);
> + closure_bio_submit(bio, cl);
>
> continue_at(cl, journal_write_done, NULL);
> }
> diff --git a/drivers/md/bcache/request.c b/drivers/md/bcache/request.c
> index f292790..ab093a8 100644
> --- a/drivers/md/bcache/request.c
> +++ b/drivers/md/bcache/request.c
> @@ -718,7 +718,7 @@ static void cached_dev_read_error(struct closure *cl)
>
> /* XXX: invalidate cache */
>
> - closure_bio_submit(bio, cl, s->d);
> + closure_bio_submit(bio, cl);
> }
>
> continue_at(cl, cached_dev_cache_miss_done, NULL);
> @@ -841,7 +841,7 @@ static int cached_dev_cache_miss(struct btree *b, struct search *s,
> s->cache_miss = miss;
> s->iop.bio = cache_bio;
> bio_get(cache_bio);
> - closure_bio_submit(cache_bio, &s->cl, s->d);
> + closure_bio_submit(cache_bio, &s->cl);
>
> return ret;
> out_put:
> @@ -849,7 +849,7 @@ out_put:
> out_submit:
> miss->bi_end_io = request_endio;
> miss->bi_private = &s->cl;
> - closure_bio_submit(miss, &s->cl, s->d);
> + closure_bio_submit(miss, &s->cl);
> return ret;
> }
>
> @@ -914,7 +914,7 @@ static void cached_dev_write(struct cached_dev *dc, struct search *s)
>
> if (!(bio->bi_rw & REQ_DISCARD) ||
> blk_queue_discard(bdev_get_queue(dc->bdev)))
> - closure_bio_submit(bio, cl, s->d);
> + closure_bio_submit(bio, cl);
> } else if (s->iop.writeback) {
> bch_writeback_add(dc);
> s->iop.bio = bio;
> @@ -929,12 +929,12 @@ static void cached_dev_write(struct cached_dev *dc, struct search *s)
> flush->bi_end_io = request_endio;
> flush->bi_private = cl;
>
> - closure_bio_submit(flush, cl, s->d);
> + closure_bio_submit(flush, cl);
> }
> } else {
> s->iop.bio = bio_clone_fast(bio, GFP_NOIO, dc->disk.bio_split);
>
> - closure_bio_submit(bio, cl, s->d);
> + closure_bio_submit(bio, cl);
> }
>
> closure_call(&s->iop.cl, bch_data_insert, NULL, cl);
> @@ -950,7 +950,7 @@ static void cached_dev_nodata(struct closure *cl)
> bch_journal_meta(s->iop.c, cl);
>
> /* If it's a flush, we send the flush to the backing device too */
> - closure_bio_submit(bio, cl, s->d);
> + closure_bio_submit(bio, cl);
>
> continue_at(cl, cached_dev_bio_complete, NULL);
> }
> @@ -994,7 +994,7 @@ static void cached_dev_make_request(struct request_queue *q, struct bio *bio)
> !blk_queue_discard(bdev_get_queue(dc->bdev)))
> bio_endio(bio, 0);
> else
> - bch_generic_make_request(bio, &d->bio_split_hook);
> + generic_make_request(bio);
> }
> }
>
> diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
> index 94980bf..db70c9e 100644
> --- a/drivers/md/bcache/super.c
> +++ b/drivers/md/bcache/super.c
> @@ -59,29 +59,6 @@ struct workqueue_struct *bcache_wq;
>
> #define BTREE_MAX_PAGES (256 * 1024 / PAGE_SIZE)
>
> -static void bio_split_pool_free(struct bio_split_pool *p)
> -{
> - if (p->bio_split_hook)
> - mempool_destroy(p->bio_split_hook);
> -
> - if (p->bio_split)
> - bioset_free(p->bio_split);
> -}
> -
> -static int bio_split_pool_init(struct bio_split_pool *p)
> -{
> - p->bio_split = bioset_create(4, 0);
> - if (!p->bio_split)
> - return -ENOMEM;
> -
> - p->bio_split_hook = mempool_create_kmalloc_pool(4,
> - sizeof(struct bio_split_hook));
> - if (!p->bio_split_hook)
> - return -ENOMEM;
> -
> - return 0;
> -}
> -
> /* Superblock */
>
> static const char *read_super(struct cache_sb *sb, struct block_device *bdev,
> @@ -537,7 +514,7 @@ static void prio_io(struct cache *ca, uint64_t bucket, unsigned long rw)
> bio->bi_private = ca;
> bch_bio_map(bio, ca->disk_buckets);
>
> - closure_bio_submit(bio, &ca->prio, ca);
> + closure_bio_submit(bio, &ca->prio);
> closure_sync(cl);
> }
>
> @@ -757,7 +734,6 @@ static void bcache_device_free(struct bcache_device *d)
> put_disk(d->disk);
> }
>
> - bio_split_pool_free(&d->bio_split_hook);
> if (d->bio_split)
> bioset_free(d->bio_split);
> kvfree(d->full_dirty_stripes);
> @@ -804,7 +780,6 @@ static int bcache_device_init(struct bcache_device *d, unsigned block_size,
> return minor;
>
> if (!(d->bio_split = bioset_create(4, offsetof(struct bbio, bio))) ||
> - bio_split_pool_init(&d->bio_split_hook) ||
> !(d->disk = alloc_disk(1))) {
> ida_simple_remove(&bcache_minor, minor);
> return -ENOMEM;
> @@ -1793,8 +1768,6 @@ void bch_cache_release(struct kobject *kobj)
> ca->set->cache[ca->sb.nr_this_dev] = NULL;
> }
>
> - bio_split_pool_free(&ca->bio_split_hook);
> -
> free_pages((unsigned long) ca->disk_buckets, ilog2(bucket_pages(ca)));
> kfree(ca->prio_buckets);
> vfree(ca->buckets);
> @@ -1839,8 +1812,7 @@ static int cache_alloc(struct cache_sb *sb, struct cache *ca)
> ca->sb.nbuckets)) ||
> !(ca->prio_buckets = kzalloc(sizeof(uint64_t) * prio_buckets(ca) *
> 2, GFP_KERNEL)) ||
> - !(ca->disk_buckets = alloc_bucket_pages(GFP_KERNEL, ca)) ||
> - bio_split_pool_init(&ca->bio_split_hook))
> + !(ca->disk_buckets = alloc_bucket_pages(GFP_KERNEL, ca)))
> return -ENOMEM;
>
> ca->prio_last_buckets = ca->prio_buckets + prio_buckets(ca);
> diff --git a/drivers/md/bcache/util.h b/drivers/md/bcache/util.h
> index 1d04c48..cf2cbc2 100644
> --- a/drivers/md/bcache/util.h
> +++ b/drivers/md/bcache/util.h
> @@ -4,6 +4,7 @@
>
> #include <linux/blkdev.h>
> #include <linux/errno.h>
> +#include <linux/blkdev.h>
> #include <linux/kernel.h>
> #include <linux/llist.h>
> #include <linux/ratelimit.h>
> @@ -570,10 +571,10 @@ static inline sector_t bdev_sectors(struct block_device *bdev)
> return bdev->bd_inode->i_size >> 9;
> }
>
> -#define closure_bio_submit(bio, cl, dev) \
> +#define closure_bio_submit(bio, cl) \
> do { \
> closure_get(cl); \
> - bch_generic_make_request(bio, &(dev)->bio_split_hook); \
> + generic_make_request(bio); \
> } while (0)
>
> uint64_t bch_crc64_update(uint64_t, const void *, size_t);
> diff --git a/drivers/md/bcache/writeback.c b/drivers/md/bcache/writeback.c
> index f1986bc..ca38362 100644
> --- a/drivers/md/bcache/writeback.c
> +++ b/drivers/md/bcache/writeback.c
> @@ -188,7 +188,7 @@ static void write_dirty(struct closure *cl)
> io->bio.bi_bdev = io->dc->bdev;
> io->bio.bi_end_io = dirty_endio;
>
> - closure_bio_submit(&io->bio, cl, &io->dc->disk);
> + closure_bio_submit(&io->bio, cl);
>
> continue_at(cl, write_dirty_finish, system_wq);
> }
> @@ -208,7 +208,7 @@ static void read_dirty_submit(struct closure *cl)
> {
> struct dirty_io *io = container_of(cl, struct dirty_io, cl);
>
> - closure_bio_submit(&io->bio, cl, &io->dc->disk);
> + closure_bio_submit(&io->bio, cl);
>
> continue_at(cl, write_dirty, system_wq);
> }
> --
> 2.1.4
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-bcache" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
>
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: bcache: remove driver private bio splitting code
2016-01-08 1:53 ` Eric Wheeler
@ 2016-01-13 2:00 ` Eric Wheeler
2016-01-13 5:54 ` Vojtech Pavlik
0 siblings, 1 reply; 5+ messages in thread
From: Eric Wheeler @ 2016-01-13 2:00 UTC (permalink / raw)
To: vojtech; +Cc: linux-bcache
[-- Attachment #1: Type: TEXT/PLAIN, Size: 17907 bytes --]
Hi Vojtěch,
Have you tested the patch below in SLE12-* when bcache is backed by md
raid5/6?
FYI: I was compared the drivers/md/bcache/io.c functions in the various
branches here:
https://github.com/openSUSE/kernel
I compared the presence of bch_generic_make_request() (which the patch
below removes). It looks like the branch SLE12-SP2 has the patch, but
version before SLE12-SP2 and openSUSE-* do not (as they still have
bch_generic_make_request).
Since the patch does exist in SLE12-SP2, I'm guessing that is been tested,
though I am curious if it has been tested specifically when being backed
by md raid5/6 so that queue->limits->partial_stripes_expensive is nonzero.
If you have and it is stable, then I want to get it to Kent and Jens for
upstream integration.
Thanks!
-Eric
--
Eric Wheeler, President eWheeler, Inc. dba Global Linux Security
888-LINUX26 (888-546-8926) Fax: 503-716-3878 PO Box 25107
www.GlobalLinuxSecurity.pro Linux since 1996! Portland, OR 97298
On Thu, 7 Jan 2016, Eric Wheeler wrote:
> > From: Kent Overstreet Wed, 12 Aug 2015 00:07:13 -0700
> > The bcache driver has always accepted arbitrarily large bios and split
> > them internally. Now that every driver must accept arbitrarily large
> > bios this code isn't nessecary anymore.
>
> Hi Kent,
>
> Does your patch below make any kernel version assumptions about bio
> splitting? That doesn't appear so based on the commit message, but
> thought I'd double-check.
>
> If there is a kernel dependency, then, how far back should this be safe?
> I'd like to apply to 3.17-rc1 like the other stable commits and stamp it
> with Cc: stable@ so it will merge forward into 3.18 and onward if it fixes
> my problem below:
>
> This question comes up because I'm getting the following
> (discard-related?) backtrace and would like to try the patch. If it fixes
> the problem I'll stamp it with stable and get it to Jens. Note that
> bch_generic_make_request() doesn't even exist after this patch, so this
> backtrace would at least be simplified and possibly fixed:
>
> [ 294.059255] [<ffffffffa049a20d>] bch_generic_make_request+0x15d/0x1f0 [bcache]
> [ 294.059578] [<ffffffffa049a3b9>] __bch_submit_bbio+0x79/0x80 [bcache]
> [ 294.059794] [<ffffffffa049a3eb>] bch_submit_bbio+0x2b/0x30 [bcache]
> [ 294.059983] [<ffffffffa049fabb>] bch_data_insert_start+0xcb/0x5a0 [bcache]
> [ 294.060169] [<ffffffffa049ffe1>] bch_data_insert+0x51/0xc0 [bcache]
> [ 294.060354] [<ffffffffa04a0cc4>] cached_dev_make_request+0xbe4/0xdf0 [bcache]
> [ 294.060652] [<ffffffff81317c20>] generic_make_request+0xe0/0x130
> [ 294.060830] [<ffffffff81317ce7>] submit_bio+0x77/0x150
> [ 294.061012] [<ffffffff81312906>] ? bio_alloc_bioset+0x1d6/0x330
> [ 294.061194] [<ffffffffa04cef90>] ? le64_dec+0x20/0x20 [dm_persistent_data]
> [ 294.061377] [<ffffffffa04e49be>] __blkdev_issue_discard_async.constprop.59+0x17e/0x210 [dm_thin_pool]
> [ 294.061695] [<ffffffffa04e55dc>] process_prepared_discard_passdown+0x9c/0x230 [dm_thin_pool]
> [ 294.062007] [<ffffffff811ac73f>] ? mempool_free+0x2f/0x90
> [ 294.062207] [<ffffffffa04e0772>] process_prepared+0x92/0xc0 [dm_thin_pool]
> [ 294.062404] [<ffffffffa04e5f78>] do_worker+0xb8/0x880 [dm_thin_pool]
> [ 294.062606] [<ffffffff81014693>] ? __switch_to+0x1e3/0x580
> [ 294.062796] [<ffffffff810dc71c>] ? put_prev_task_fair+0x2c/0x40
> [ 294.062989] [<ffffffff810ba18d>] process_one_work+0x14d/0x420
> [ 294.063171] [<ffffffff810ba952>] worker_thread+0x112/0x520
> [ 294.063355] [<ffffffff810ba840>] ? rescuer_thread+0x3e0/0x3e0
> [ 294.063560] [<ffffffff810c06a8>] kthread+0xd8/0xf0
> [ 294.063737] [<ffffffff810c05d0>] ? kthread_create_on_node+0x1b0/0x1b0
> [ 294.063943] [<ffffffff816e4aa2>] ret_from_fork+0x42/0x70
> [ 294.064133] [<ffffffff810c05d0>] ? kthread_create_on_node+0x1b0/0x1b0
>
>
> Thanks!
>
> -Eric
>
> > Cc: linux-bcache@vger.kernel.org
> > Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
> > [dpark: add more description in commit message]
> > Signed-off-by: Dongsu Park <dpark@posteo.net>
> > Signed-off-by: Ming Lin <ming.l@ssi.samsung.com>
> > ---
> > drivers/md/bcache/bcache.h | 18 --------
> > drivers/md/bcache/io.c | 101 +-----------------------------------------
> > drivers/md/bcache/journal.c | 4 +-
> > drivers/md/bcache/request.c | 16 +++----
> > drivers/md/bcache/super.c | 32 +------------
> > drivers/md/bcache/util.h | 5 ++-
> > drivers/md/bcache/writeback.c | 4 +-
> > 7 files changed, 18 insertions(+), 162 deletions(-)
> >
> > diff --git a/drivers/md/bcache/bcache.h b/drivers/md/bcache/bcache.h
> > index 04f7bc2..6b420a5 100644
> > --- a/drivers/md/bcache/bcache.h
> > +++ b/drivers/md/bcache/bcache.h
> > @@ -243,19 +243,6 @@ struct keybuf {
> > DECLARE_ARRAY_ALLOCATOR(struct keybuf_key, freelist, KEYBUF_NR);
> > };
> >
> > -struct bio_split_pool {
> > - struct bio_set *bio_split;
> > - mempool_t *bio_split_hook;
> > -};
> > -
> > -struct bio_split_hook {
> > - struct closure cl;
> > - struct bio_split_pool *p;
> > - struct bio *bio;
> > - bio_end_io_t *bi_end_io;
> > - void *bi_private;
> > -};
> > -
> > struct bcache_device {
> > struct closure cl;
> >
> > @@ -288,8 +275,6 @@ struct bcache_device {
> > int (*cache_miss)(struct btree *, struct search *,
> > struct bio *, unsigned);
> > int (*ioctl) (struct bcache_device *, fmode_t, unsigned, unsigned long);
> > -
> > - struct bio_split_pool bio_split_hook;
> > };
> >
> > struct io {
> > @@ -454,8 +439,6 @@ struct cache {
> > atomic_long_t meta_sectors_written;
> > atomic_long_t btree_sectors_written;
> > atomic_long_t sectors_written;
> > -
> > - struct bio_split_pool bio_split_hook;
> > };
> >
> > struct gc_stat {
> > @@ -873,7 +856,6 @@ void bch_bbio_endio(struct cache_set *, struct bio *, int, const char *);
> > void bch_bbio_free(struct bio *, struct cache_set *);
> > struct bio *bch_bbio_alloc(struct cache_set *);
> >
> > -void bch_generic_make_request(struct bio *, struct bio_split_pool *);
> > void __bch_submit_bbio(struct bio *, struct cache_set *);
> > void bch_submit_bbio(struct bio *, struct cache_set *, struct bkey *, unsigned);
> >
> > diff --git a/drivers/md/bcache/io.c b/drivers/md/bcache/io.c
> > index bf6a9ca..86a0bb8 100644
> > --- a/drivers/md/bcache/io.c
> > +++ b/drivers/md/bcache/io.c
> > @@ -11,105 +11,6 @@
> >
> > #include <linux/blkdev.h>
> >
> > -static unsigned bch_bio_max_sectors(struct bio *bio)
> > -{
> > - struct request_queue *q = bdev_get_queue(bio->bi_bdev);
> > - struct bio_vec bv;
> > - struct bvec_iter iter;
> > - unsigned ret = 0, seg = 0;
> > -
> > - if (bio->bi_rw & REQ_DISCARD)
> > - return min(bio_sectors(bio), q->limits.max_discard_sectors);
> > -
> > - bio_for_each_segment(bv, bio, iter) {
> > - struct bvec_merge_data bvm = {
> > - .bi_bdev = bio->bi_bdev,
> > - .bi_sector = bio->bi_iter.bi_sector,
> > - .bi_size = ret << 9,
> > - .bi_rw = bio->bi_rw,
> > - };
> > -
> > - if (seg == min_t(unsigned, BIO_MAX_PAGES,
> > - queue_max_segments(q)))
> > - break;
> > -
> > - if (q->merge_bvec_fn &&
> > - q->merge_bvec_fn(q, &bvm, &bv) < (int) bv.bv_len)
> > - break;
> > -
> > - seg++;
> > - ret += bv.bv_len >> 9;
> > - }
> > -
> > - ret = min(ret, queue_max_sectors(q));
> > -
> > - WARN_ON(!ret);
> > - ret = max_t(int, ret, bio_iovec(bio).bv_len >> 9);
> > -
> > - return ret;
> > -}
> > -
> > -static void bch_bio_submit_split_done(struct closure *cl)
> > -{
> > - struct bio_split_hook *s = container_of(cl, struct bio_split_hook, cl);
> > -
> > - s->bio->bi_end_io = s->bi_end_io;
> > - s->bio->bi_private = s->bi_private;
> > - bio_endio(s->bio, 0);
> > -
> > - closure_debug_destroy(&s->cl);
> > - mempool_free(s, s->p->bio_split_hook);
> > -}
> > -
> > -static void bch_bio_submit_split_endio(struct bio *bio, int error)
> > -{
> > - struct closure *cl = bio->bi_private;
> > - struct bio_split_hook *s = container_of(cl, struct bio_split_hook, cl);
> > -
> > - if (error)
> > - clear_bit(BIO_UPTODATE, &s->bio->bi_flags);
> > -
> > - bio_put(bio);
> > - closure_put(cl);
> > -}
> > -
> > -void bch_generic_make_request(struct bio *bio, struct bio_split_pool *p)
> > -{
> > - struct bio_split_hook *s;
> > - struct bio *n;
> > -
> > - if (!bio_has_data(bio) && !(bio->bi_rw & REQ_DISCARD))
> > - goto submit;
> > -
> > - if (bio_sectors(bio) <= bch_bio_max_sectors(bio))
> > - goto submit;
> > -
> > - s = mempool_alloc(p->bio_split_hook, GFP_NOIO);
> > - closure_init(&s->cl, NULL);
> > -
> > - s->bio = bio;
> > - s->p = p;
> > - s->bi_end_io = bio->bi_end_io;
> > - s->bi_private = bio->bi_private;
> > - bio_get(bio);
> > -
> > - do {
> > - n = bio_next_split(bio, bch_bio_max_sectors(bio),
> > - GFP_NOIO, s->p->bio_split);
> > -
> > - n->bi_end_io = bch_bio_submit_split_endio;
> > - n->bi_private = &s->cl;
> > -
> > - closure_get(&s->cl);
> > - generic_make_request(n);
> > - } while (n != bio);
> > -
> > - continue_at(&s->cl, bch_bio_submit_split_done, NULL);
> > - return;
> > -submit:
> > - generic_make_request(bio);
> > -}
> > -
> > /* Bios with headers */
> >
> > void bch_bbio_free(struct bio *bio, struct cache_set *c)
> > @@ -139,7 +40,7 @@ void __bch_submit_bbio(struct bio *bio, struct cache_set *c)
> > bio->bi_bdev = PTR_CACHE(c, &b->key, 0)->bdev;
> >
> > b->submit_time_us = local_clock_us();
> > - closure_bio_submit(bio, bio->bi_private, PTR_CACHE(c, &b->key, 0));
> > + closure_bio_submit(bio, bio->bi_private);
> > }
> >
> > void bch_submit_bbio(struct bio *bio, struct cache_set *c,
> > diff --git a/drivers/md/bcache/journal.c b/drivers/md/bcache/journal.c
> > index 418607a..727ca9b 100644
> > --- a/drivers/md/bcache/journal.c
> > +++ b/drivers/md/bcache/journal.c
> > @@ -61,7 +61,7 @@ reread: left = ca->sb.bucket_size - offset;
> > bio->bi_private = &cl;
> > bch_bio_map(bio, data);
> >
> > - closure_bio_submit(bio, &cl, ca);
> > + closure_bio_submit(bio, &cl);
> > closure_sync(&cl);
> >
> > /* This function could be simpler now since we no longer write
> > @@ -648,7 +648,7 @@ static void journal_write_unlocked(struct closure *cl)
> > spin_unlock(&c->journal.lock);
> >
> > while ((bio = bio_list_pop(&list)))
> > - closure_bio_submit(bio, cl, c->cache[0]);
> > + closure_bio_submit(bio, cl);
> >
> > continue_at(cl, journal_write_done, NULL);
> > }
> > diff --git a/drivers/md/bcache/request.c b/drivers/md/bcache/request.c
> > index f292790..ab093a8 100644
> > --- a/drivers/md/bcache/request.c
> > +++ b/drivers/md/bcache/request.c
> > @@ -718,7 +718,7 @@ static void cached_dev_read_error(struct closure *cl)
> >
> > /* XXX: invalidate cache */
> >
> > - closure_bio_submit(bio, cl, s->d);
> > + closure_bio_submit(bio, cl);
> > }
> >
> > continue_at(cl, cached_dev_cache_miss_done, NULL);
> > @@ -841,7 +841,7 @@ static int cached_dev_cache_miss(struct btree *b, struct search *s,
> > s->cache_miss = miss;
> > s->iop.bio = cache_bio;
> > bio_get(cache_bio);
> > - closure_bio_submit(cache_bio, &s->cl, s->d);
> > + closure_bio_submit(cache_bio, &s->cl);
> >
> > return ret;
> > out_put:
> > @@ -849,7 +849,7 @@ out_put:
> > out_submit:
> > miss->bi_end_io = request_endio;
> > miss->bi_private = &s->cl;
> > - closure_bio_submit(miss, &s->cl, s->d);
> > + closure_bio_submit(miss, &s->cl);
> > return ret;
> > }
> >
> > @@ -914,7 +914,7 @@ static void cached_dev_write(struct cached_dev *dc, struct search *s)
> >
> > if (!(bio->bi_rw & REQ_DISCARD) ||
> > blk_queue_discard(bdev_get_queue(dc->bdev)))
> > - closure_bio_submit(bio, cl, s->d);
> > + closure_bio_submit(bio, cl);
> > } else if (s->iop.writeback) {
> > bch_writeback_add(dc);
> > s->iop.bio = bio;
> > @@ -929,12 +929,12 @@ static void cached_dev_write(struct cached_dev *dc, struct search *s)
> > flush->bi_end_io = request_endio;
> > flush->bi_private = cl;
> >
> > - closure_bio_submit(flush, cl, s->d);
> > + closure_bio_submit(flush, cl);
> > }
> > } else {
> > s->iop.bio = bio_clone_fast(bio, GFP_NOIO, dc->disk.bio_split);
> >
> > - closure_bio_submit(bio, cl, s->d);
> > + closure_bio_submit(bio, cl);
> > }
> >
> > closure_call(&s->iop.cl, bch_data_insert, NULL, cl);
> > @@ -950,7 +950,7 @@ static void cached_dev_nodata(struct closure *cl)
> > bch_journal_meta(s->iop.c, cl);
> >
> > /* If it's a flush, we send the flush to the backing device too */
> > - closure_bio_submit(bio, cl, s->d);
> > + closure_bio_submit(bio, cl);
> >
> > continue_at(cl, cached_dev_bio_complete, NULL);
> > }
> > @@ -994,7 +994,7 @@ static void cached_dev_make_request(struct request_queue *q, struct bio *bio)
> > !blk_queue_discard(bdev_get_queue(dc->bdev)))
> > bio_endio(bio, 0);
> > else
> > - bch_generic_make_request(bio, &d->bio_split_hook);
> > + generic_make_request(bio);
> > }
> > }
> >
> > diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
> > index 94980bf..db70c9e 100644
> > --- a/drivers/md/bcache/super.c
> > +++ b/drivers/md/bcache/super.c
> > @@ -59,29 +59,6 @@ struct workqueue_struct *bcache_wq;
> >
> > #define BTREE_MAX_PAGES (256 * 1024 / PAGE_SIZE)
> >
> > -static void bio_split_pool_free(struct bio_split_pool *p)
> > -{
> > - if (p->bio_split_hook)
> > - mempool_destroy(p->bio_split_hook);
> > -
> > - if (p->bio_split)
> > - bioset_free(p->bio_split);
> > -}
> > -
> > -static int bio_split_pool_init(struct bio_split_pool *p)
> > -{
> > - p->bio_split = bioset_create(4, 0);
> > - if (!p->bio_split)
> > - return -ENOMEM;
> > -
> > - p->bio_split_hook = mempool_create_kmalloc_pool(4,
> > - sizeof(struct bio_split_hook));
> > - if (!p->bio_split_hook)
> > - return -ENOMEM;
> > -
> > - return 0;
> > -}
> > -
> > /* Superblock */
> >
> > static const char *read_super(struct cache_sb *sb, struct block_device *bdev,
> > @@ -537,7 +514,7 @@ static void prio_io(struct cache *ca, uint64_t bucket, unsigned long rw)
> > bio->bi_private = ca;
> > bch_bio_map(bio, ca->disk_buckets);
> >
> > - closure_bio_submit(bio, &ca->prio, ca);
> > + closure_bio_submit(bio, &ca->prio);
> > closure_sync(cl);
> > }
> >
> > @@ -757,7 +734,6 @@ static void bcache_device_free(struct bcache_device *d)
> > put_disk(d->disk);
> > }
> >
> > - bio_split_pool_free(&d->bio_split_hook);
> > if (d->bio_split)
> > bioset_free(d->bio_split);
> > kvfree(d->full_dirty_stripes);
> > @@ -804,7 +780,6 @@ static int bcache_device_init(struct bcache_device *d, unsigned block_size,
> > return minor;
> >
> > if (!(d->bio_split = bioset_create(4, offsetof(struct bbio, bio))) ||
> > - bio_split_pool_init(&d->bio_split_hook) ||
> > !(d->disk = alloc_disk(1))) {
> > ida_simple_remove(&bcache_minor, minor);
> > return -ENOMEM;
> > @@ -1793,8 +1768,6 @@ void bch_cache_release(struct kobject *kobj)
> > ca->set->cache[ca->sb.nr_this_dev] = NULL;
> > }
> >
> > - bio_split_pool_free(&ca->bio_split_hook);
> > -
> > free_pages((unsigned long) ca->disk_buckets, ilog2(bucket_pages(ca)));
> > kfree(ca->prio_buckets);
> > vfree(ca->buckets);
> > @@ -1839,8 +1812,7 @@ static int cache_alloc(struct cache_sb *sb, struct cache *ca)
> > ca->sb.nbuckets)) ||
> > !(ca->prio_buckets = kzalloc(sizeof(uint64_t) * prio_buckets(ca) *
> > 2, GFP_KERNEL)) ||
> > - !(ca->disk_buckets = alloc_bucket_pages(GFP_KERNEL, ca)) ||
> > - bio_split_pool_init(&ca->bio_split_hook))
> > + !(ca->disk_buckets = alloc_bucket_pages(GFP_KERNEL, ca)))
> > return -ENOMEM;
> >
> > ca->prio_last_buckets = ca->prio_buckets + prio_buckets(ca);
> > diff --git a/drivers/md/bcache/util.h b/drivers/md/bcache/util.h
> > index 1d04c48..cf2cbc2 100644
> > --- a/drivers/md/bcache/util.h
> > +++ b/drivers/md/bcache/util.h
> > @@ -4,6 +4,7 @@
> >
> > #include <linux/blkdev.h>
> > #include <linux/errno.h>
> > +#include <linux/blkdev.h>
> > #include <linux/kernel.h>
> > #include <linux/llist.h>
> > #include <linux/ratelimit.h>
> > @@ -570,10 +571,10 @@ static inline sector_t bdev_sectors(struct block_device *bdev)
> > return bdev->bd_inode->i_size >> 9;
> > }
> >
> > -#define closure_bio_submit(bio, cl, dev) \
> > +#define closure_bio_submit(bio, cl) \
> > do { \
> > closure_get(cl); \
> > - bch_generic_make_request(bio, &(dev)->bio_split_hook); \
> > + generic_make_request(bio); \
> > } while (0)
> >
> > uint64_t bch_crc64_update(uint64_t, const void *, size_t);
> > diff --git a/drivers/md/bcache/writeback.c b/drivers/md/bcache/writeback.c
> > index f1986bc..ca38362 100644
> > --- a/drivers/md/bcache/writeback.c
> > +++ b/drivers/md/bcache/writeback.c
> > @@ -188,7 +188,7 @@ static void write_dirty(struct closure *cl)
> > io->bio.bi_bdev = io->dc->bdev;
> > io->bio.bi_end_io = dirty_endio;
> >
> > - closure_bio_submit(&io->bio, cl, &io->dc->disk);
> > + closure_bio_submit(&io->bio, cl);
> >
> > continue_at(cl, write_dirty_finish, system_wq);
> > }
> > @@ -208,7 +208,7 @@ static void read_dirty_submit(struct closure *cl)
> > {
> > struct dirty_io *io = container_of(cl, struct dirty_io, cl);
> >
> > - closure_bio_submit(&io->bio, cl, &io->dc->disk);
> > + closure_bio_submit(&io->bio, cl);
> >
> > continue_at(cl, write_dirty, system_wq);
> > }
> > --
> > 2.1.4
> >
> > --
> > To unsubscribe from this list: send the line "unsubscribe linux-bcache" in
> > the body of a message to majordomo@vger.kernel.org
> > More majordomo info at http://vger.kernel.org/majordomo-info.html
> >
> --
> To unsubscribe from this list: send the line "unsubscribe linux-bcache" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
>
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: bcache: remove driver private bio splitting code
2016-01-13 2:00 ` Eric Wheeler
@ 2016-01-13 5:54 ` Vojtech Pavlik
2016-01-13 23:03 ` Eric Wheeler
0 siblings, 1 reply; 5+ messages in thread
From: Vojtech Pavlik @ 2016-01-13 5:54 UTC (permalink / raw)
To: Eric Wheeler; +Cc: linux-bcache
On Tue, Jan 12, 2016 at 06:00:49PM -0800, Eric Wheeler wrote:
Hello Eric,
> Have you tested the patch below in SLE12-* when bcache is backed by md
> raid5/6?
>
> FYI: I was compared the drivers/md/bcache/io.c functions in the various
> branches here:
> https://github.com/openSUSE/kernel
> I compared the presence of bch_generic_make_request() (which the patch
> below removes). It looks like the branch SLE12-SP2 has the patch, but
> version before SLE12-SP2 and openSUSE-* do not (as they still have
> bch_generic_make_request).
>
> Since the patch does exist in SLE12-SP2, I'm guessing that is been tested,
> though I am curious if it has been tested specifically when being backed
> by md raid5/6 so that queue->limits->partial_stripes_expensive is nonzero.
>
> If you have and it is stable, then I want to get it to Kent and Jens for
> upstream integration.
The SLES12-SP2 kernel branch is very fresh, created this week. So while
the patch was tested by Johannes before adding it, and by our per-commit
automated tests, it didn't go through fully qualified QA test cycle yet.
So I won't say it's proven stable just yet.
--
Vojtech Pavlik
Director SUSE Labs
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: bcache: remove driver private bio splitting code
2016-01-13 5:54 ` Vojtech Pavlik
@ 2016-01-13 23:03 ` Eric Wheeler
0 siblings, 0 replies; 5+ messages in thread
From: Eric Wheeler @ 2016-01-13 23:03 UTC (permalink / raw)
To: Vojtech Pavlik; +Cc: linux-bcache
> On Tue, Jan 12, 2016 at 06:00:49PM -0800, Eric Wheeler wrote:
>
> Hello Eric,
>
> > Have you tested the patch below in SLE12-* when bcache is backed by md
> > raid5/6?
> >
> > FYI: I was compared the drivers/md/bcache/io.c functions in the various
> > branches here:
> > https://github.com/openSUSE/kernel
> > I compared the presence of bch_generic_make_request() (which the patch
> > below removes). It looks like the branch SLE12-SP2 has the patch, but
> > version before SLE12-SP2 and openSUSE-* do not (as they still have
> > bch_generic_make_request).
> >
> > Since the patch does exist in SLE12-SP2, I'm guessing that is been tested,
> > though I am curious if it has been tested specifically when being backed
> > by md raid5/6 so that queue->limits->partial_stripes_expensive is nonzero.
> >
> > If you have and it is stable, then I want to get it to Kent and Jens for
> > upstream integration.
>
> The SLES12-SP2 kernel branch is very fresh, created this week. So while
> the patch was tested by Johannes before adding it, and by our per-commit
> automated tests, it didn't go through fully qualified QA test cycle yet.
> So I won't say it's proven stable just yet.
Good to know, thank you for that!
I encourage you to include md-based raid5/6 backed bcache volumes in your
testing if it is not already. This particular patch may affect that use
case. Please keep us posted, I look forward to learning about the
bcache-specific test cycle results.
-Eric
>
> --
> Vojtech Pavlik
> Director SUSE Labs
> --
> To unsubscribe from this list: send the line "unsubscribe linux-bcache" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
>
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2016-01-13 23:03 UTC | newest]
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2015-08-12 7:07 ` [PATCH v6 03/11] bcache: remove driver private bio splitting code Ming Lin
2016-01-08 1:53 ` Eric Wheeler
2016-01-13 2:00 ` Eric Wheeler
2016-01-13 5:54 ` Vojtech Pavlik
2016-01-13 23:03 ` Eric Wheeler
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