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Message-Id: <1314881345-6420-6-git-send-email-philipp.reisner@linbit.com>
Date: Thu, 1 Sep 2011 14:48:52 +0200
From: Philipp Reisner <philipp.reisner@...bit.com>
To: linux-kernel@...r.kernel.org, Jens Axboe <axboe@...nel.dk>
Cc: drbd-dev@...ts.linbit.com
Subject: [PATCH 05/18] drbd: introduce a bio_set to allocate housekeeping bios from
From: Lars Ellenberg <lars.ellenberg@...bit.com>
Don't rely on availability of bios from the global fs_bio_set,
we should use our own bio_set for meta data IO.
Signed-off-by: Philipp Reisner <philipp.reisner@...bit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@...bit.com>
---
drivers/block/drbd/drbd_actlog.c | 2 +-
drivers/block/drbd/drbd_bitmap.c | 3 +--
drivers/block/drbd/drbd_int.h | 6 ++++++
drivers/block/drbd/drbd_main.c | 28 ++++++++++++++++++++++++++++
drivers/block/drbd/drbd_receiver.c | 6 +++++-
5 files changed, 41 insertions(+), 4 deletions(-)
diff --git a/drivers/block/drbd/drbd_actlog.c b/drivers/block/drbd/drbd_actlog.c
index 55f5a7a..9ab6365 100644
--- a/drivers/block/drbd/drbd_actlog.c
+++ b/drivers/block/drbd/drbd_actlog.c
@@ -125,7 +125,7 @@ static int _drbd_md_sync_page_io(struct drbd_conf *mdev,
rw |= REQ_FUA | REQ_FLUSH;
rw |= REQ_SYNC;
- bio = bio_alloc(GFP_NOIO, 1);
+ bio = bio_alloc_drbd(GFP_NOIO);
bio->bi_bdev = bdev->md_bdev;
bio->bi_sector = sector;
ok = (bio_add_page(bio, page, size, 0) == size);
diff --git a/drivers/block/drbd/drbd_bitmap.c b/drivers/block/drbd/drbd_bitmap.c
index 412ca94..a1d72db 100644
--- a/drivers/block/drbd/drbd_bitmap.c
+++ b/drivers/block/drbd/drbd_bitmap.c
@@ -968,8 +968,7 @@ static void bm_async_io_complete(struct bio *bio, int error)
static void bm_page_io_async(struct bm_aio_ctx *ctx, int page_nr, int rw) __must_hold(local)
{
- /* we are process context. we always get a bio */
- struct bio *bio = bio_alloc(GFP_KERNEL, 1);
+ struct bio *bio = bio_alloc_drbd(GFP_KERNEL);
struct drbd_conf *mdev = ctx->mdev;
struct drbd_bitmap *b = mdev->bitmap;
struct page *page;
diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h
index 4debab7..5d90b9d 100644
--- a/drivers/block/drbd/drbd_int.h
+++ b/drivers/block/drbd/drbd_int.h
@@ -1489,6 +1489,12 @@ extern wait_queue_head_t drbd_pp_wait;
#define DRBD_MIN_POOL_PAGES 128
extern mempool_t *drbd_md_io_page_pool;
+/* We also need to make sure we get a bio
+ * when we need it for housekeeping purposes */
+extern struct bio_set *drbd_md_io_bio_set;
+/* to allocate from that set */
+extern struct bio *bio_alloc_drbd(gfp_t gfp_mask);
+
extern rwlock_t global_state_lock;
extern int conn_lowest_minor(struct drbd_tconn *tconn);
diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index cb1636c..26bcd13 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -130,6 +130,7 @@ struct kmem_cache *drbd_al_ext_cache; /* activity log extents */
mempool_t *drbd_request_mempool;
mempool_t *drbd_ee_mempool;
mempool_t *drbd_md_io_page_pool;
+struct bio_set *drbd_md_io_bio_set;
/* I do not use a standard mempool, because:
1) I want to hand out the pre-allocated objects first.
@@ -150,6 +151,25 @@ static const struct block_device_operations drbd_ops = {
.release = drbd_release,
};
+static void bio_destructor_drbd(struct bio *bio)
+{
+ bio_free(bio, drbd_md_io_bio_set);
+}
+
+struct bio *bio_alloc_drbd(gfp_t gfp_mask)
+{
+ struct bio *bio;
+
+ if (!drbd_md_io_bio_set)
+ return bio_alloc(gfp_mask, 1);
+
+ bio = bio_alloc_bioset(gfp_mask, 1, drbd_md_io_bio_set);
+ if (!bio)
+ return NULL;
+ bio->bi_destructor = bio_destructor_drbd;
+ return bio;
+}
+
#ifdef __CHECKER__
/* When checking with sparse, and this is an inline function, sparse will
give tons of false positives. When this is a real functions sparse works.
@@ -1953,6 +1973,8 @@ static void drbd_destroy_mempools(void)
/* D_ASSERT(atomic_read(&drbd_pp_vacant)==0); */
+ if (drbd_md_io_bio_set)
+ bioset_free(drbd_md_io_bio_set);
if (drbd_md_io_page_pool)
mempool_destroy(drbd_md_io_page_pool);
if (drbd_ee_mempool)
@@ -1968,6 +1990,7 @@ static void drbd_destroy_mempools(void)
if (drbd_al_ext_cache)
kmem_cache_destroy(drbd_al_ext_cache);
+ drbd_md_io_bio_set = NULL;
drbd_md_io_page_pool = NULL;
drbd_ee_mempool = NULL;
drbd_request_mempool = NULL;
@@ -1993,6 +2016,7 @@ static int drbd_create_mempools(void)
drbd_al_ext_cache = NULL;
drbd_pp_pool = NULL;
drbd_md_io_page_pool = NULL;
+ drbd_md_io_bio_set = NULL;
/* caches */
drbd_request_cache = kmem_cache_create(
@@ -2016,6 +2040,10 @@ static int drbd_create_mempools(void)
goto Enomem;
/* mempools */
+ drbd_md_io_bio_set = bioset_create(DRBD_MIN_POOL_PAGES, 0);
+ if (drbd_md_io_bio_set == NULL)
+ goto Enomem;
+
drbd_md_io_page_pool = mempool_create_page_pool(DRBD_MIN_POOL_PAGES, 0);
if (drbd_md_io_page_pool == NULL)
goto Enomem;
diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
index 64f658b..12b1533 100644
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -1127,7 +1127,11 @@ int drbd_submit_peer_request(struct drbd_conf *mdev,
/* In most cases, we will only need one bio. But in case the lower
* level restrictions happen to be different at this offset on this
* side than those of the sending peer, we may need to submit the
- * request in more than one bio. */
+ * request in more than one bio.
+ *
+ * Plain bio_alloc is good enough here, this is no DRBD internally
+ * generated bio, but a bio allocated on behalf of the peer.
+ */
next_bio:
bio = bio_alloc(GFP_NOIO, nr_pages);
if (!bio) {
--
1.7.4.1
--
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