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SUNRPC: Fix potential races in xprt_lock_write_next()

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We have to ensure that the wake up from the waitqueue and the assignment
of xprt->snd_task are atomic. We can do this by assigning the snd_task
while under the waitqueue spinlock.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust
2012-01-17 22:57:37 -05:00
parent 2aeb98f498
commit 961a828df6
6 changed files with 79 additions and 46 deletions
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13
fs/nfs/nfs4proc.c
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@@ -385,17 +385,20 @@ nfs4_free_slot(struct nfs4_slot_table *tbl, u8 free_slotid)
free_slotid, tbl->highest_used_slotid);
}
bool nfs4_set_task_privileged(struct rpc_task *task, void *dummy)
{
rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
return true;
}
/*
* Signal state manager thread if session fore channel is drained
*/
static void nfs4_check_drain_fc_complete(struct nfs4_session *ses)
{
struct rpc_task *task;
if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
task = rpc_wake_up_next(&ses->fc_slot_table.slot_tbl_waitq);
if (task)
rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
rpc_wake_up_first(&ses->fc_slot_table.slot_tbl_waitq,
nfs4_set_task_privileged, NULL);
return;
}