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NFS: slight optimization for walking list for delegations 

There are 3 places where we walk the list of delegations
for an nfs_client.
In each case there are two nested loops, one for nfs_servers
and one for nfs_delegations.

When we find an interesting delegation we try to get an active
reference to the server.  If that fails, it is pointless to
continue to look at the other delegation for the server as
we will never be able to get an active reference.
So instead of continuing in the inner loop, break out
and continue in the outer loop.

Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
NeilBrown 2018-05-31 15:23:22 +10:00 committed by Trond Myklebust
parent 9f6d44d418
commit f389349142
1 changed files with 3 additions and 3 deletions
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6
fs/nfs/delegation.c
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@ -495,7 +495,7 @@ restart:
if (!nfs_delegation_need_return(delegation))
continue;
if (!nfs_sb_active(server->super))
continue;
break; /* continue in outer loop */
inode = nfs_delegation_grab_inode(delegation);
if (inode == NULL) {
rcu_read_unlock();
@ -887,7 +887,7 @@ restart:
&delegation->flags) == 0)
continue;
if (!nfs_sb_active(server->super))
continue;
break; /* continue in outer loop */
inode = nfs_delegation_grab_inode(delegation);
if (inode == NULL) {
rcu_read_unlock();
@ -995,7 +995,7 @@ restart:
&delegation->flags) == 0)
continue;
if (!nfs_sb_active(server->super))
continue;
break; /* continue in outer loop */
inode = nfs_delegation_grab_inode(delegation);
if (inode == NULL) {
rcu_read_unlock();