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

View File

@ -65,6 +65,7 @@ struct ent {
u32 id; u32 id;
char name[IDMAP_NAMESZ]; char name[IDMAP_NAMESZ];
char authname[IDMAP_NAMESZ]; char authname[IDMAP_NAMESZ];
struct rcu_head rcu_head;
}; };
/* Common entry handling */ /* Common entry handling */
@ -89,7 +90,7 @@ static void
ent_put(struct kref *ref) ent_put(struct kref *ref)
{ {
struct ent *map = container_of(ref, struct ent, h.ref); struct ent *map = container_of(ref, struct ent, h.ref);
kfree(map); kfree_rcu(map, rcu_head);
} }
static struct cache_head * static struct cache_head *
@ -264,7 +265,7 @@ idtoname_parse(struct cache_detail *cd, char *buf, int buflen)
static struct ent * static struct ent *
idtoname_lookup(struct cache_detail *cd, struct ent *item) idtoname_lookup(struct cache_detail *cd, struct ent *item)
{ {
struct cache_head *ch = sunrpc_cache_lookup(cd, &item->h, struct cache_head *ch = sunrpc_cache_lookup_rcu(cd, &item->h,
idtoname_hash(item)); idtoname_hash(item));
if (ch) if (ch)
return container_of(ch, struct ent, h); return container_of(ch, struct ent, h);
@ -422,7 +423,7 @@ nametoid_parse(struct cache_detail *cd, char *buf, int buflen)
static struct ent * static struct ent *
nametoid_lookup(struct cache_detail *cd, struct ent *item) nametoid_lookup(struct cache_detail *cd, struct ent *item)
{ {
struct cache_head *ch = sunrpc_cache_lookup(cd, &item->h, struct cache_head *ch = sunrpc_cache_lookup_rcu(cd, &item->h,
nametoid_hash(item)); nametoid_hash(item));
if (ch) if (ch)
return container_of(ch, struct ent, h); return container_of(ch, struct ent, h);