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-rw-r--r--drivers/block/drbd/drbd_actlog.c12
-rw-r--r--drivers/block/drbd/drbd_main.c1
-rw-r--r--drivers/block/drbd/drbd_receiver.c22
-rw-r--r--drivers/block/drbd/drbd_req.c1
4 files changed, 26 insertions, 10 deletions
diff --git a/drivers/block/drbd/drbd_actlog.c b/drivers/block/drbd/drbd_actlog.c
index 209b2e063b9..e81085795ec 100644
--- a/drivers/block/drbd/drbd_actlog.c
+++ b/drivers/block/drbd/drbd_actlog.c
@@ -248,11 +248,12 @@ void drbd_al_begin_io(struct drbd_conf *mdev, struct drbd_interval *i)
/* for bios crossing activity log extent boundaries,
* we may need to activate two extents in one go */
unsigned first = i->sector >> (AL_EXTENT_SHIFT-9);
- unsigned last = (i->sector + (i->size >> 9) - 1) >> (AL_EXTENT_SHIFT-9);
+ unsigned last = i->size == 0 ? first : (i->sector + (i->size >> 9) - 1) >> (AL_EXTENT_SHIFT-9);
unsigned enr;
bool locked = false;
+ D_ASSERT(first <= last);
D_ASSERT(atomic_read(&mdev->local_cnt) > 0);
for (enr = first; enr <= last; enr++)
@@ -305,11 +306,12 @@ void drbd_al_complete_io(struct drbd_conf *mdev, struct drbd_interval *i)
/* for bios crossing activity log extent boundaries,
* we may need to activate two extents in one go */
unsigned first = i->sector >> (AL_EXTENT_SHIFT-9);
- unsigned last = (i->sector + (i->size >> 9) - 1) >> (AL_EXTENT_SHIFT-9);
+ unsigned last = i->size == 0 ? first : (i->sector + (i->size >> 9) - 1) >> (AL_EXTENT_SHIFT-9);
unsigned enr;
struct lc_element *extent;
unsigned long flags;
+ D_ASSERT(first <= last);
spin_lock_irqsave(&mdev->al_lock, flags);
for (enr = first; enr <= last; enr++) {
@@ -756,7 +758,11 @@ int __drbd_set_out_of_sync(struct drbd_conf *mdev, sector_t sector, int size,
unsigned int enr, count = 0;
struct lc_element *e;
- if (size <= 0 || !IS_ALIGNED(size, 512) || size > DRBD_MAX_BIO_SIZE) {
+ /* this should be an empty REQ_FLUSH */
+ if (size == 0)
+ return 0;
+
+ if (size < 0 || !IS_ALIGNED(size, 512) || size > DRBD_MAX_BIO_SIZE) {
dev_err(DEV, "sector: %llus, size: %d\n",
(unsigned long long)sector, size);
return 0;
diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index f2af74d0686..85d95ec405e 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -2640,6 +2640,7 @@ enum drbd_ret_code conn_new_minor(struct drbd_tconn *tconn, unsigned int minor,
q->backing_dev_info.congested_data = mdev;
blk_queue_make_request(q, drbd_make_request);
+ blk_queue_flush(q, REQ_FLUSH | REQ_FUA);
/* Setting the max_hw_sectors to an odd value of 8kibyte here
This triggers a max_bio_size message upon first attach or connect */
blk_queue_max_hw_sectors(q, DRBD_MAX_BIO_SIZE_SAFE >> 8);
diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
index 8fddec96dfb..a6f0b293836 100644
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -295,6 +295,9 @@ static void drbd_free_pages(struct drbd_conf *mdev, struct page *page, int is_ne
atomic_t *a = is_net ? &mdev->pp_in_use_by_net : &mdev->pp_in_use;
int i;
+ if (page == NULL)
+ return;
+
if (drbd_pp_vacant > (DRBD_MAX_BIO_SIZE/PAGE_SIZE) * minor_count)
i = page_chain_free(page);
else {
@@ -331,7 +334,7 @@ drbd_alloc_peer_req(struct drbd_conf *mdev, u64 id, sector_t sector,
unsigned int data_size, gfp_t gfp_mask) __must_hold(local)
{
struct drbd_peer_request *peer_req;
- struct page *page;
+ struct page *page = NULL;
unsigned nr_pages = (data_size + PAGE_SIZE -1) >> PAGE_SHIFT;
if (drbd_insert_fault(mdev, DRBD_FAULT_AL_EE))
@@ -344,9 +347,11 @@ drbd_alloc_peer_req(struct drbd_conf *mdev, u64 id, sector_t sector,
return NULL;
}
- page = drbd_alloc_pages(mdev, nr_pages, (gfp_mask & __GFP_WAIT));
- if (!page)
- goto fail;
+ if (data_size) {
+ page = drbd_alloc_pages(mdev, nr_pages, (gfp_mask & __GFP_WAIT));
+ if (!page)
+ goto fail;
+ }
drbd_clear_interval(&peer_req->i);
peer_req->i.size = data_size;
@@ -1513,8 +1518,6 @@ read_in_block(struct drbd_conf *mdev, u64 id, sector_t sector,
data_size -= dgs;
}
- if (!expect(data_size != 0))
- return NULL;
if (!expect(IS_ALIGNED(data_size, 512)))
return NULL;
if (!expect(data_size <= DRBD_MAX_BIO_SIZE))
@@ -1537,6 +1540,9 @@ read_in_block(struct drbd_conf *mdev, u64 id, sector_t sector,
if (!peer_req)
return NULL;
+ if (!data_size)
+ return peer_req;
+
ds = data_size;
page = peer_req->pages;
page_chain_for_each(page) {
@@ -2199,6 +2205,10 @@ static int receive_Data(struct drbd_tconn *tconn, struct packet_info *pi)
dp_flags = be32_to_cpu(p->dp_flags);
rw |= wire_flags_to_bio(mdev, dp_flags);
+ if (peer_req->pages == NULL) {
+ D_ASSERT(peer_req->i.size == 0);
+ D_ASSERT(dp_flags & DP_FLUSH);
+ }
if (dp_flags & DP_MAY_SET_IN_SYNC)
peer_req->flags |= EE_MAY_SET_IN_SYNC;
diff --git a/drivers/block/drbd/drbd_req.c b/drivers/block/drbd/drbd_req.c
index e215dce4c69..8323449fbba 100644
--- a/drivers/block/drbd/drbd_req.c
+++ b/drivers/block/drbd/drbd_req.c
@@ -1097,7 +1097,6 @@ int drbd_make_request(struct request_queue *q, struct bio *bio)
/*
* what we "blindly" assume:
*/
- D_ASSERT(bio->bi_size > 0);
D_ASSERT(IS_ALIGNED(bio->bi_size, 512));
inc_ap_bio(mdev);