From 46e1ce4177aac86b8e39bc7bb5763e9d040ae5cb Mon Sep 17 00:00:00 2001 From: Philipp Reisner Date: Mon, 16 May 2011 12:57:15 +0200 Subject: [PATCH] drbd: protect updates to integrits_tfm by tconn->data->mutex Since we need to hold that mutex anyways to make sure the peer gets that change in the right position in the data stream, it makes a lot of sense to use the same mutex to ensure existence of the tfm. Signed-off-by: Philipp Reisner Signed-off-by: Lars Ellenberg --- drivers/block/drbd/drbd_int.h | 2 +- drivers/block/drbd/drbd_main.c | 9 +++++---- 2 files changed, 6 insertions(+), 5 deletions(-) diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h index e167228..c59012f 100644 --- a/drivers/block/drbd/drbd_int.h +++ b/drivers/block/drbd/drbd_int.h @@ -848,7 +848,7 @@ struct drbd_tconn { /* is a resource from the config file */ struct list_head out_of_sequence_requests; struct crypto_hash *cram_hmac_tfm; - struct crypto_hash *integrity_tfm; /* checksums we compute */ + struct crypto_hash *integrity_tfm; /* checksums we compute, updates protected by tconn->data->mutex */ struct crypto_hash *peer_integrity_tfm; /* checksums we verify */ struct crypto_hash *csums_tfm; struct crypto_hash *verify_tfm; diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c index 26d7763..bca599a 100644 --- a/drivers/block/drbd/drbd_main.c +++ b/drivers/block/drbd/drbd_main.c @@ -1720,11 +1720,11 @@ int drbd_send_dblock(struct drbd_conf *mdev, struct drbd_request *req) int dgs; int err; + sock = &mdev->tconn->data; + p = drbd_prepare_command(mdev, sock); dgs = (mdev->tconn->agreed_pro_version >= 87 && mdev->tconn->integrity_tfm) ? crypto_hash_digestsize(mdev->tconn->integrity_tfm) : 0; - sock = &mdev->tconn->data; - p = drbd_prepare_command(mdev, sock); if (!p) return -EIO; p->sector = cpu_to_be64(req->i.sector); @@ -1793,11 +1793,12 @@ int drbd_send_block(struct drbd_conf *mdev, enum drbd_packet cmd, int err; int dgs; + sock = &mdev->tconn->data; + p = drbd_prepare_command(mdev, sock); + dgs = (mdev->tconn->agreed_pro_version >= 87 && mdev->tconn->integrity_tfm) ? crypto_hash_digestsize(mdev->tconn->integrity_tfm) : 0; - sock = &mdev->tconn->data; - p = drbd_prepare_command(mdev, sock); if (!p) return -EIO; p->sector = cpu_to_be64(peer_req->i.sector); -- 2.7.4