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NFS: Force the legacy idmapper to be single threaded

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It was initially coded under the assumption that there would only be one
request at a time, so use a lock to enforce this requirement..

Signed-off-by: Bryan Schumaker <bjschuma@netapp.com>
CC: stable@vger.kernel.org [3.4+]
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Bryan Schumaker 2012-06-20 14:35:28 -04:00 committed by Trond Myklebust
parent 1a0de48ae5
commit b1027439df
1 changed files with 8 additions and 5 deletions
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13
fs/nfs/idmap.c
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@ -57,6 +57,11 @@ unsigned int nfs_idmap_cache_timeout = 600;
static const struct cred *id_resolver_cache;
static struct key_type key_type_id_resolver_legacy;
struct idmap {
struct rpc_pipe *idmap_pipe;
struct key_construction *idmap_key_cons;
struct mutex idmap_mutex;
};
/**
* nfs_fattr_init_names - initialise the nfs_fattr owner_name/group_name fields
@ -310,9 +315,11 @@ static ssize_t nfs_idmap_get_key(const char *name, size_t namelen,
name, namelen, type, data,
data_size, NULL);
if (ret < 0) {
mutex_lock(&idmap->idmap_mutex);
ret = nfs_idmap_request_key(&key_type_id_resolver_legacy,
name, namelen, type, data,
data_size, idmap);
mutex_unlock(&idmap->idmap_mutex);
}
return ret;
}
@ -354,11 +361,6 @@ static int nfs_idmap_lookup_id(const char *name, size_t namelen, const char *typ
/* idmap classic begins here */
module_param(nfs_idmap_cache_timeout, int, 0644);
struct idmap {
struct rpc_pipe *idmap_pipe;
struct key_construction *idmap_key_cons;
};
enum {
Opt_find_uid, Opt_find_gid, Opt_find_user, Opt_find_group, Opt_find_err
};
@ -469,6 +471,7 @@ nfs_idmap_new(struct nfs_client *clp)
return error;
}
idmap->idmap_pipe = pipe;
mutex_init(&idmap->idmap_mutex);
clp->cl_idmap = idmap;
return 0;