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| author | Trond Myklebust <trondmy@gmail.com> | 2018-10-01 10:41:50 -0400 |
|---|---|---|
| committer | J. Bruce Fields <bfields@redhat.com> | 2018-10-29 16:58:04 -0400 |
| commit | 437f91451349a94d581cb9a928fa3958153f0b71 (patch) | |
| tree | d1c07159d2696cbd073664c1ef43c5640411ac0b | |
| parent | 9d5afd9491c80779730686159aeec7fa06ead085 (diff) | |
| download | linux-437f91451349a94d581cb9a928fa3958153f0b71.tar.bz2 | |
NFS: Lockless DNS lookups
Enable RCU protected lookup in the legacy DNS resolver.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
| -rw-r--r-- | fs/nfs/dns_resolve.c | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/fs/nfs/dns_resolve.c b/fs/nfs/dns_resolve.c index 060c658eab66..e93a5dc07c8c 100644 --- a/fs/nfs/dns_resolve.c +++ b/fs/nfs/dns_resolve.c @@ -65,6 +65,7 @@ struct nfs_dns_ent { struct sockaddr_storage addr; size_t addrlen; + struct rcu_head rcu_head; }; @@ -101,15 +102,23 @@ static void nfs_dns_ent_init(struct cache_head *cnew, } } -static void nfs_dns_ent_put(struct kref *ref) +static void nfs_dns_ent_free_rcu(struct rcu_head *head) { struct nfs_dns_ent *item; - item = container_of(ref, struct nfs_dns_ent, h.ref); + item = container_of(head, struct nfs_dns_ent, rcu_head); kfree(item->hostname); kfree(item); } +static void nfs_dns_ent_put(struct kref *ref) +{ + struct nfs_dns_ent *item; + + item = container_of(ref, struct nfs_dns_ent, h.ref); + call_rcu(item, nfs_dns_ent_free_rcu); +} + static struct cache_head *nfs_dns_ent_alloc(void) { struct nfs_dns_ent *item = kmalloc(sizeof(*item), GFP_KERNEL); @@ -195,7 +204,7 @@ static struct nfs_dns_ent *nfs_dns_lookup(struct cache_detail *cd, { struct cache_head *ch; - ch = sunrpc_cache_lookup(cd, + ch = sunrpc_cache_lookup_rcu(cd, &key->h, nfs_dns_hash(key)); if (!ch) |