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SUNRPC: create unix gid cache per network namespace

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v2:
1) fixed silly usage of template cache as a real one (this code left from
static global cache for all)

This patch makes unix_gid_cache cache detail allocated and registered per
network namespace context.
Thus with this patch unix_gid_cache contents for network namespace "X" are
controlled from proc file system mount for the same network namespace "X".

Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Acked-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Stanislav Kinsbursky 2012-01-19 21:42:29 +04:00 • committed by Trond Myklebust
parent 0a402d5a65
commit 73393232d6
3 changed files with 52 additions and 18 deletions
Download patch file Download diff file Expand all files Collapse all files

55
net/sunrpc/svcauth_unix.c
View file

@ -436,7 +436,6 @@ struct unix_gid {
uid_t uid;
struct group_info *gi;
};
static struct cache_head *gid_table[GID_HASHMAX];
static void unix_gid_put(struct kref *kref)
{
@ -494,8 +493,7 @@ static int unix_gid_upcall(struct cache_detail *cd, struct cache_head *h)
return sunrpc_cache_pipe_upcall(cd, h, unix_gid_request);
}
static struct unix_gid *unix_gid_lookup(uid_t uid);
extern struct cache_detail unix_gid_cache;
static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, uid_t uid);
static int unix_gid_parse(struct cache_detail *cd,
char *mesg, int mlen)
@ -539,19 +537,19 @@ static int unix_gid_parse(struct cache_detail *cd,
GROUP_AT(ug.gi, i) = gid;
}
ugp = unix_gid_lookup(uid);
ugp = unix_gid_lookup(cd, uid);
if (ugp) {
struct cache_head *ch;
ug.h.flags = 0;
ug.h.expiry_time = expiry;
ch = sunrpc_cache_update(&unix_gid_cache,
ch = sunrpc_cache_update(cd,
&ug.h, &ugp->h,
hash_long(uid, GID_HASHBITS));
if (!ch)
err = -ENOMEM;
else {
err = 0;
cache_put(ch, &unix_gid_cache);
cache_put(ch, cd);
}
} else
err = -ENOMEM;
@ -587,10 +585,9 @@ static int unix_gid_show(struct seq_file *m,
return 0;
}
struct cache_detail unix_gid_cache = {
static struct cache_detail unix_gid_cache_template = {
.owner = THIS_MODULE,
.hash_size = GID_HASHMAX,
.hash_table = gid_table,
.name = "auth.unix.gid",
.cache_put = unix_gid_put,
.cache_upcall = unix_gid_upcall,
@ -602,14 +599,42 @@ struct cache_detail unix_gid_cache = {
.alloc = unix_gid_alloc,
};
static struct unix_gid *unix_gid_lookup(uid_t uid)
int unix_gid_cache_create(struct net *net)
{
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
struct cache_detail *cd;
int err;
cd = cache_create_net(&unix_gid_cache_template, net);
if (IS_ERR(cd))
return PTR_ERR(cd);
err = cache_register_net(cd, net);
if (err) {
cache_destroy_net(cd, net);
return err;
}
sn->unix_gid_cache = cd;
return 0;
}
void unix_gid_cache_destroy(struct net *net)
{
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
struct cache_detail *cd = sn->unix_gid_cache;
sn->unix_gid_cache = NULL;
cache_purge(cd);
cache_unregister_net(cd, net);
cache_destroy_net(cd, net);
}
static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, uid_t uid)
{
struct unix_gid ug;
struct cache_head *ch;
ug.uid = uid;
ch = sunrpc_cache_lookup(&unix_gid_cache, &ug.h,
hash_long(uid, GID_HASHBITS));
ch = sunrpc_cache_lookup(cd, &ug.h, hash_long(uid, GID_HASHBITS));
if (ch)
return container_of(ch, struct unix_gid, h);
else
@ -621,11 +646,13 @@ static struct group_info *unix_gid_find(uid_t uid, struct svc_rqst *rqstp)
struct unix_gid *ug;
struct group_info *gi;
int ret;
struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net,
sunrpc_net_id);
ug = unix_gid_lookup(uid);
ug = unix_gid_lookup(sn->unix_gid_cache, uid);
if (!ug)
return ERR_PTR(-EAGAIN);
ret = cache_check(&unix_gid_cache, &ug->h, &rqstp->rq_chandle);
ret = cache_check(sn->unix_gid_cache, &ug->h, &rqstp->rq_chandle);
switch (ret) {
case -ENOENT:
return ERR_PTR(-ENOENT);
@ -633,7 +660,7 @@ static struct group_info *unix_gid_find(uid_t uid, struct svc_rqst *rqstp)
return ERR_PTR(-ESHUTDOWN);
case 0:
gi = get_group_info(ug->gi);
cache_put(&ug->h, &unix_gid_cache);
cache_put(&ug->h, sn->unix_gid_cache);
return gi;
default:
return ERR_PTR(-EAGAIN);