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NFSv4.1: Keep a reference on lock states while checking 

While walking the list of lock_states, keep a reference on each
nfs4_lock_state to be checked, otherwise the lock state could be removed
while the check performs TEST_STATEID and possible FREE_STATEID.

Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Benjamin Coddington 2016-11-18 21:11:39 -05:00 committed by Anna Schumaker
parent d41cbfc9a6
commit d75a6a0e39
1 changed files with 15 additions and 3 deletions
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18
fs/nfs/nfs4proc.c
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@ -2564,15 +2564,23 @@ static void nfs41_check_delegation_stateid(struct nfs4_state *state)
static int nfs41_check_expired_locks(struct nfs4_state *state)
{
int status, ret = NFS_OK;
struct nfs4_lock_state *lsp;
struct nfs4_lock_state *lsp, *prev = NULL;
struct nfs_server *server = NFS_SERVER(state->inode);
if (!test_bit(LK_STATE_IN_USE, &state->flags))
goto out;
spin_lock(&state->state_lock);
list_for_each_entry(lsp, &state->lock_states, ls_locks) {
if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
atomic_inc(&lsp->ls_count);
spin_unlock(&state->state_lock);
nfs4_put_lock_state(prev);
prev = lsp;
status = nfs41_test_and_free_expired_stateid(server,
&lsp->ls_stateid,
cred);
@ -2585,10 +2593,14 @@ static int nfs41_check_expired_locks(struct nfs4_state *state)
set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
} else if (status != NFS_OK) {
ret = status;
break;
nfs4_put_lock_state(prev);
goto out;
}
spin_lock(&state->state_lock);
}
};
}
spin_unlock(&state->state_lock);
nfs4_put_lock_state(prev);
out:
return ret;
}