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knfsd: Lockless lookup of NFSv4 identities. 

Enable RCU protected lookups of the NFSv4 idmap.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Trond Myklebust 2018-10-01 10:41:49 -04:00 committed by J. Bruce Fields
parent 6d1616b26c
commit 9d5afd9491
1 changed files with 6 additions and 5 deletions
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11
fs/nfsd/nfs4idmap.c
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@ -65,6 +65,7 @@ struct ent {
u32 id;
char name[IDMAP_NAMESZ];
char authname[IDMAP_NAMESZ];
struct rcu_head rcu_head;
};
/* Common entry handling */
@ -89,7 +90,7 @@ static void
ent_put(struct kref *ref)
{
struct ent *map = container_of(ref, struct ent, h.ref);
kfree(map);
kfree_rcu(map, rcu_head);
}
static struct cache_head *
@ -264,8 +265,8 @@ out:
static struct ent *
idtoname_lookup(struct cache_detail *cd, struct ent *item)
{
struct cache_head *ch = sunrpc_cache_lookup(cd, &item->h,
idtoname_hash(item));
struct cache_head *ch = sunrpc_cache_lookup_rcu(cd, &item->h,
idtoname_hash(item));
if (ch)
return container_of(ch, struct ent, h);
else
@ -422,8 +423,8 @@ out:
static struct ent *
nametoid_lookup(struct cache_detail *cd, struct ent *item)
{
struct cache_head *ch = sunrpc_cache_lookup(cd, &item->h,
nametoid_hash(item));
struct cache_head *ch = sunrpc_cache_lookup_rcu(cd, &item->h,
nametoid_hash(item));
if (ch)
return container_of(ch, struct ent, h);
else