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Message-ID: <CA+1xoqfUHMVdFm2_S9DC=pba1tuLRvkFSG6nn-jtspNmmXzGiw@mail.gmail.com>
Date: Fri, 11 Jan 2013 13:49:50 -0500
From: Sasha Levin <levinsasha928@...il.com>
To: Sasha Levin <sasha.levin@...cle.com>
Cc: Alasdair Kergon <agk@...hat.com>, dm-devel@...hat.com,
Neil Brown <neilb@...e.de>, linux-kernel@...r.kernel.org,
linux-raid@...r.kernel.org
Subject: Re: [PATCH 11/15] dm: use new hashtable implementation
Ping?
On Mon, Dec 17, 2012 at 10:01 AM, Sasha Levin <sasha.levin@...cle.com> wrote:
> Switch dm to use the new hashtable implementation. This reduces the amount of
> generic unrelated code in the dm.
>
> This patch depends on d9b482c ("hashtable: introduce a small and naive
> hashtable") which was merged in v3.6.
>
> Signed-off-by: Sasha Levin <sasha.levin@...cle.com>
> ---
> drivers/md/dm-snap.c | 24 +++++------------
> drivers/md/persistent-data/dm-block-manager.c | 1 -
> .../persistent-data/dm-persistent-data-internal.h | 19 --------------
> .../md/persistent-data/dm-transaction-manager.c | 30 +++++++---------------
> 4 files changed, 16 insertions(+), 58 deletions(-)
> delete mode 100644 drivers/md/persistent-data/dm-persistent-data-internal.h
>
> diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c
> index 223e7eb..4b19fa0 100644
> --- a/drivers/md/dm-snap.c
> +++ b/drivers/md/dm-snap.c
> @@ -34,9 +34,7 @@ static const char dm_snapshot_merge_target_name[] = "snapshot-merge";
> */
> #define MIN_IOS 256
>
> -#define DM_TRACKED_CHUNK_HASH_SIZE 16
> -#define DM_TRACKED_CHUNK_HASH(x) ((unsigned long)(x) & \
> - (DM_TRACKED_CHUNK_HASH_SIZE - 1))
> +#define DM_TRACKED_CHUNK_HASH_BITS 4
>
> struct dm_exception_table {
> uint32_t hash_mask;
> @@ -80,7 +78,7 @@ struct dm_snapshot {
> /* Chunks with outstanding reads */
> spinlock_t tracked_chunk_lock;
> mempool_t *tracked_chunk_pool;
> - struct hlist_head tracked_chunk_hash[DM_TRACKED_CHUNK_HASH_SIZE];
> + DECLARE_HASHTABLE(tracked_chunk_hash, DM_TRACKED_CHUNK_HASH_BITS);
>
> /* The on disk metadata handler */
> struct dm_exception_store *store;
> @@ -202,8 +200,7 @@ static struct dm_snap_tracked_chunk *track_chunk(struct dm_snapshot *s,
> c->chunk = chunk;
>
> spin_lock_irq(&s->tracked_chunk_lock);
> - hlist_add_head(&c->node,
> - &s->tracked_chunk_hash[DM_TRACKED_CHUNK_HASH(chunk)]);
> + hash_add(s->tracked_chunk_hash, &c->node, chunk);
> spin_unlock_irq(&s->tracked_chunk_lock);
>
> return c;
> @@ -215,7 +212,7 @@ static void stop_tracking_chunk(struct dm_snapshot *s,
> unsigned long flags;
>
> spin_lock_irqsave(&s->tracked_chunk_lock, flags);
> - hlist_del(&c->node);
> + hash_del(&c->node);
> spin_unlock_irqrestore(&s->tracked_chunk_lock, flags);
>
> mempool_free(c, s->tracked_chunk_pool);
> @@ -229,8 +226,7 @@ static int __chunk_is_tracked(struct dm_snapshot *s, chunk_t chunk)
>
> spin_lock_irq(&s->tracked_chunk_lock);
>
> - hlist_for_each_entry(c, hn,
> - &s->tracked_chunk_hash[DM_TRACKED_CHUNK_HASH(chunk)], node) {
> + hash_for_each_possible(s->tracked_chunk_hash, c, hn, node, chunk) {
> if (c->chunk == chunk) {
> found = 1;
> break;
> @@ -1032,7 +1028,6 @@ static void stop_merge(struct dm_snapshot *s)
> static int snapshot_ctr(struct dm_target *ti, unsigned int argc, char **argv)
> {
> struct dm_snapshot *s;
> - int i;
> int r = -EINVAL;
> char *origin_path, *cow_path;
> unsigned args_used, num_flush_requests = 1;
> @@ -1127,8 +1122,7 @@ static int snapshot_ctr(struct dm_target *ti, unsigned int argc, char **argv)
> goto bad_tracked_chunk_pool;
> }
>
> - for (i = 0; i < DM_TRACKED_CHUNK_HASH_SIZE; i++)
> - INIT_HLIST_HEAD(&s->tracked_chunk_hash[i]);
> + hash_init(s->tracked_chunk_hash);
>
> spin_lock_init(&s->tracked_chunk_lock);
>
> @@ -1252,9 +1246,6 @@ static void __handover_exceptions(struct dm_snapshot *snap_src,
>
> static void snapshot_dtr(struct dm_target *ti)
> {
> -#ifdef CONFIG_DM_DEBUG
> - int i;
> -#endif
> struct dm_snapshot *s = ti->private;
> struct dm_snapshot *snap_src = NULL, *snap_dest = NULL;
>
> @@ -1285,8 +1276,7 @@ static void snapshot_dtr(struct dm_target *ti)
> smp_mb();
>
> #ifdef CONFIG_DM_DEBUG
> - for (i = 0; i < DM_TRACKED_CHUNK_HASH_SIZE; i++)
> - BUG_ON(!hlist_empty(&s->tracked_chunk_hash[i]));
> + BUG_ON(!hash_empty(s->tracked_chunk_hash));
> #endif
>
> mempool_destroy(s->tracked_chunk_pool);
> diff --git a/drivers/md/persistent-data/dm-block-manager.c b/drivers/md/persistent-data/dm-block-manager.c
> index 28c3ed0..083a133 100644
> --- a/drivers/md/persistent-data/dm-block-manager.c
> +++ b/drivers/md/persistent-data/dm-block-manager.c
> @@ -4,7 +4,6 @@
> * This file is released under the GPL.
> */
> #include "dm-block-manager.h"
> -#include "dm-persistent-data-internal.h"
> #include "../dm-bufio.h"
>
> #include <linux/crc32c.h>
> diff --git a/drivers/md/persistent-data/dm-persistent-data-internal.h b/drivers/md/persistent-data/dm-persistent-data-internal.h
> deleted file mode 100644
> index c49e26f..0000000
> --- a/drivers/md/persistent-data/dm-persistent-data-internal.h
> +++ /dev/null
> @@ -1,19 +0,0 @@
> -/*
> - * Copyright (C) 2011 Red Hat, Inc.
> - *
> - * This file is released under the GPL.
> - */
> -
> -#ifndef _DM_PERSISTENT_DATA_INTERNAL_H
> -#define _DM_PERSISTENT_DATA_INTERNAL_H
> -
> -#include "dm-block-manager.h"
> -
> -static inline unsigned dm_hash_block(dm_block_t b, unsigned hash_mask)
> -{
> - const unsigned BIG_PRIME = 4294967291UL;
> -
> - return (((unsigned) b) * BIG_PRIME) & hash_mask;
> -}
> -
> -#endif /* _PERSISTENT_DATA_INTERNAL_H */
> diff --git a/drivers/md/persistent-data/dm-transaction-manager.c b/drivers/md/persistent-data/dm-transaction-manager.c
> index d247a35..9eb9417 100644
> --- a/drivers/md/persistent-data/dm-transaction-manager.c
> +++ b/drivers/md/persistent-data/dm-transaction-manager.c
> @@ -7,11 +7,11 @@
> #include "dm-space-map.h"
> #include "dm-space-map-disk.h"
> #include "dm-space-map-metadata.h"
> -#include "dm-persistent-data-internal.h"
>
> #include <linux/export.h>
> #include <linux/slab.h>
> #include <linux/device-mapper.h>
> +#include <linux/hashtable.h>
>
> #define DM_MSG_PREFIX "transaction manager"
>
> @@ -25,8 +25,7 @@ struct shadow_info {
> /*
> * It would be nice if we scaled with the size of transaction.
> */
> -#define HASH_SIZE 256
> -#define HASH_MASK (HASH_SIZE - 1)
> +#define DM_HASH_BITS 8
>
> struct dm_transaction_manager {
> int is_clone;
> @@ -36,7 +35,7 @@ struct dm_transaction_manager {
> struct dm_space_map *sm;
>
> spinlock_t lock;
> - struct hlist_head buckets[HASH_SIZE];
> + DECLARE_HASHTABLE(hash, DM_HASH_BITS);
> };
>
> /*----------------------------------------------------------------*/
> @@ -44,12 +43,11 @@ struct dm_transaction_manager {
> static int is_shadow(struct dm_transaction_manager *tm, dm_block_t b)
> {
> int r = 0;
> - unsigned bucket = dm_hash_block(b, HASH_MASK);
> struct shadow_info *si;
> struct hlist_node *n;
>
> spin_lock(&tm->lock);
> - hlist_for_each_entry(si, n, tm->buckets + bucket, hlist)
> + hash_for_each_possible(tm->hash, si, n, hlist, b)
> if (si->where == b) {
> r = 1;
> break;
> @@ -65,15 +63,13 @@ static int is_shadow(struct dm_transaction_manager *tm, dm_block_t b)
> */
> static void insert_shadow(struct dm_transaction_manager *tm, dm_block_t b)
> {
> - unsigned bucket;
> struct shadow_info *si;
>
> si = kmalloc(sizeof(*si), GFP_NOIO);
> if (si) {
> si->where = b;
> - bucket = dm_hash_block(b, HASH_MASK);
> spin_lock(&tm->lock);
> - hlist_add_head(&si->hlist, tm->buckets + bucket);
> + hash_add(tm->hash, &si->hlist, b);
> spin_unlock(&tm->lock);
> }
> }
> @@ -82,18 +78,12 @@ static void wipe_shadow_table(struct dm_transaction_manager *tm)
> {
> struct shadow_info *si;
> struct hlist_node *n, *tmp;
> - struct hlist_head *bucket;
> int i;
>
> spin_lock(&tm->lock);
> - for (i = 0; i < HASH_SIZE; i++) {
> - bucket = tm->buckets + i;
> - hlist_for_each_entry_safe(si, n, tmp, bucket, hlist)
> - kfree(si);
> -
> - INIT_HLIST_HEAD(bucket);
> - }
> -
> + hash_for_each_safe(tm->hash, i, n, tmp, si, hlist)
> + kfree(si);
> + hash_init(tm->hash);
> spin_unlock(&tm->lock);
> }
>
> @@ -102,7 +92,6 @@ static void wipe_shadow_table(struct dm_transaction_manager *tm)
> static struct dm_transaction_manager *dm_tm_create(struct dm_block_manager *bm,
> struct dm_space_map *sm)
> {
> - int i;
> struct dm_transaction_manager *tm;
>
> tm = kmalloc(sizeof(*tm), GFP_KERNEL);
> @@ -115,8 +104,7 @@ static struct dm_transaction_manager *dm_tm_create(struct dm_block_manager *bm,
> tm->sm = sm;
>
> spin_lock_init(&tm->lock);
> - for (i = 0; i < HASH_SIZE; i++)
> - INIT_HLIST_HEAD(tm->buckets + i);
> + hash_init(tm->hash);
>
> return tm;
> }
> --
> 1.8.0
>
> --
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