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NFS: Improve legacy idmapping fallback 

Fallback should happen only when the request_key() call fails, because
this indicates that there was a problem running the nfsidmap program.
We shouldn't call the legacy code if the error was elsewhere.

Signed-off-by: Bryan Schumaker <bjschuma@netappp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Bryan Schumaker 2013-06-26 14:09:46 -04:00 committed by Trond Myklebust
parent 62f288a02f
commit ffa57b9e53
1 changed files with 27 additions and 31 deletions
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58
fs/nfs/idmap.c
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@ -262,29 +262,42 @@ static ssize_t nfs_idmap_get_desc(const char *name, size_t namelen,
return desclen;
}
static ssize_t nfs_idmap_request_key(struct key_type *key_type,
const char *name, size_t namelen,
const char *type, void *data,
size_t data_size, struct idmap *idmap)
static struct key *nfs_idmap_request_key(const char *name, size_t namelen,
const char *type, struct idmap *idmap)
{
const struct cred *saved_cred;
struct key *rkey;
char *desc;
struct user_key_payload *payload;
struct key *rkey;
ssize_t ret;
ret = nfs_idmap_get_desc(name, namelen, type, strlen(type), &desc);
if (ret <= 0)
goto out;
return ERR_PTR(ret);
saved_cred = override_creds(id_resolver_cache);
if (idmap)
rkey = request_key_with_auxdata(key_type, desc, "", 0, idmap);
else
rkey = request_key(&key_type_id_resolver, desc, "");
revert_creds(saved_cred);
rkey = request_key(&key_type_id_resolver, desc, "");
if (IS_ERR(rkey)) {
mutex_lock(&idmap->idmap_mutex);
rkey = request_key_with_auxdata(&key_type_id_resolver_legacy,
desc, "", 0, idmap);
mutex_unlock(&idmap->idmap_mutex);
}
kfree(desc);
return rkey;
}
static ssize_t nfs_idmap_get_key(const char *name, size_t namelen,
const char *type, void *data,
size_t data_size, struct idmap *idmap)
{
const struct cred *saved_cred;
struct key *rkey;
struct user_key_payload *payload;
ssize_t ret;
saved_cred = override_creds(id_resolver_cache);
rkey = nfs_idmap_request_key(name, namelen, type, idmap);
revert_creds(saved_cred);
if (IS_ERR(rkey)) {
ret = PTR_ERR(rkey);
goto out;
@ -316,23 +329,6 @@ out:
return ret;
}
static ssize_t nfs_idmap_get_key(const char *name, size_t namelen,
const char *type, void *data,
size_t data_size, struct idmap *idmap)
{
ssize_t ret = nfs_idmap_request_key(&key_type_id_resolver,
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;
}
/* ID -> Name */
static ssize_t nfs_idmap_lookup_name(__u32 id, const char *type, char *buf,
size_t buflen, struct idmap *idmap)