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Subject[PATCH review 50/85] sunrpc: Hash uids by first computing their value in the initial userns
From: "Eric W. Biederman" <ebiederm@xmission.com>

In svcauth_unix introduce a helper unix_gid_hash as otherwise the
expresion to generate the hash value is just too long.

Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
---
net/sunrpc/auth.c | 2 +-
net/sunrpc/svcauth_unix.c | 9 +++++++--
2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/net/sunrpc/auth.c b/net/sunrpc/auth.c
index 4cd0ecf..392adc4 100644
--- a/net/sunrpc/auth.c
+++ b/net/sunrpc/auth.c
@@ -412,7 +412,7 @@ rpcauth_lookup_credcache(struct rpc_auth *auth, struct auth_cred * acred,
*entry, *new;
unsigned int nr;

- nr = hash_long(acred->uid, cache->hashbits);
+ nr = hash_long(from_kuid(&init_user_ns, acred->uid), cache->hashbits);

rcu_read_lock();
hlist_for_each_entry_rcu(entry, pos, &cache->hashtable[nr], cr_hash) {
diff --git a/net/sunrpc/svcauth_unix.c b/net/sunrpc/svcauth_unix.c
index 92166b5..faf1719 100644
--- a/net/sunrpc/svcauth_unix.c
+++ b/net/sunrpc/svcauth_unix.c
@@ -419,6 +419,11 @@ struct unix_gid {
struct group_info *gi;
};

+static int unix_gid_hash(kuid_t uid)
+{
+ return hash_long(from_kuid(&init_user_ns, uid), GID_HASHBITS);
+}
+
static void unix_gid_put(struct kref *kref)
{
struct cache_head *item = container_of(kref, struct cache_head, ref);
@@ -530,7 +535,7 @@ static int unix_gid_parse(struct cache_detail *cd,
ug.h.expiry_time = expiry;
ch = sunrpc_cache_update(cd,
&ug.h, &ugp->h,
- hash_long(uid, GID_HASHBITS));
+ unix_gid_hash(uid));
if (!ch)
err = -ENOMEM;
else {
@@ -621,7 +626,7 @@ static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, kuid_t uid)
struct cache_head *ch;

ug.uid = uid;
- ch = sunrpc_cache_lookup(cd, &ug.h, hash_long(uid, GID_HASHBITS));
+ ch = sunrpc_cache_lookup(cd, &ug.h, unix_gid_hash(uid));
if (ch)
return container_of(ch, struct unix_gid, h);
else
--
1.7.5.4


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