diff options
| author | Philipp Reisner <philipp.reisner@linbit.com> | 2012-08-08 21:19:09 +0200 |
|---|---|---|
| committer | Philipp Reisner <philipp.reisner@linbit.com> | 2012-11-09 14:08:04 +0100 |
| commit | 39a1aa7f49dc8eae5c8d3a4bf759eb7abeabe6c0 (patch) | |
| tree | d75405087a78c53b95c99ab5e2e52230a5e8cc5a /drivers/block/drbd/drbd_nl.c | |
| parent | fef45d297e447d710abcf0cd0bdbf8738ff469eb (diff) | |
drbd: Protect accesses to the uuid set with a spinlock
There is at least the worker context, the receiver context, the context of
receiving netlink packts.
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Diffstat (limited to 'drivers/block/drbd/drbd_nl.c')
| -rw-r--r-- | drivers/block/drbd/drbd_nl.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c index c02d5265c397..d31a0261e83e 100644 --- a/drivers/block/drbd/drbd_nl.c +++ b/drivers/block/drbd/drbd_nl.c @@ -1320,6 +1320,8 @@ int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info) retcode = ERR_NOMEM; goto fail; } + spin_lock_init(&nbc->md.uuid_lock); + new_disk_conf = kzalloc(sizeof(struct disk_conf), GFP_KERNEL); if (!new_disk_conf) { retcode = ERR_NOMEM; @@ -2679,8 +2681,16 @@ int nla_put_status_info(struct sk_buff *skb, struct drbd_conf *mdev, goto nla_put_failure; if (got_ldev) { + int err; + + spin_lock_irq(&mdev->ldev->md.uuid_lock); + err = nla_put(skb, T_uuids, sizeof(si->uuids), mdev->ldev->md.uuid); + spin_unlock_irq(&mdev->ldev->md.uuid_lock); + + if (err) + goto nla_put_failure; + if (nla_put_u32(skb, T_disk_flags, mdev->ldev->md.flags) || - nla_put(skb, T_uuids, sizeof(si->uuids), mdev->ldev->md.uuid) || nla_put_u64(skb, T_bits_total, drbd_bm_bits(mdev)) || nla_put_u64(skb, T_bits_oos, drbd_bm_total_weight(mdev))) goto nla_put_failure; |