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NFSv4: Ensure we skip delegations that are already being returned 

In nfs_client_return_marked_delegations() and nfs_delegation_reap_unclaimed()
we want to optimise the loop traversal by skipping delegations that are
already in the process of being returned.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Trond Myklebust 2015-02-26 14:05:05 -05:00
parent 9f0f8e12c4
commit ec3ca4e57e
1 changed files with 6 additions and 0 deletions
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6
fs/nfs/delegation.c
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@ -436,6 +436,8 @@ static bool nfs_delegation_need_return(struct nfs_delegation *delegation)
{
bool ret = false;
if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
goto out;
if (test_and_clear_bit(NFS_DELEGATION_RETURN, &delegation->flags))
ret = true;
if (test_and_clear_bit(NFS_DELEGATION_RETURN_IF_CLOSED, &delegation->flags) && !ret) {
@ -447,6 +449,7 @@ static bool nfs_delegation_need_return(struct nfs_delegation *delegation)
ret = true;
spin_unlock(&delegation->lock);
}
out:
return ret;
}
@ -818,6 +821,9 @@ restart:
list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
list_for_each_entry_rcu(delegation, &server->delegations,
super_list) {
if (test_bit(NFS_DELEGATION_RETURNING,
&delegation->flags))
continue;
if (test_bit(NFS_DELEGATION_NEED_RECLAIM,
&delegation->flags) == 0)
continue;