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Merge branch 'bugfixes' into nfs-for-next

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This commit is contained in:
Trond Myklebust 2012-10-01 15:42:14 -07:00
commit 2afdfa5a84
1 changed files with 70 additions and 34 deletions
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104
fs/nfs/idmap.c
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@ -55,18 +55,19 @@
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;
};
struct idmap_legacy_upcalldata {
struct rpc_pipe_msg pipe_msg;
struct idmap_msg idmap_msg;
struct key_construction *key_cons;
struct idmap *idmap;
};
struct idmap {
struct rpc_pipe *idmap_pipe;
struct idmap_legacy_upcalldata *idmap_upcall_data;
struct mutex idmap_mutex;
};
/**
* nfs_fattr_init_names - initialise the nfs_fattr owner_name/group_name fields
* @fattr: fully initialised struct nfs_fattr
@ -330,7 +331,6 @@ static ssize_t nfs_idmap_get_key(const char *name, size_t namelen,
ret = nfs_idmap_request_key(&key_type_id_resolver_legacy,
name, namelen, type, data,
data_size, idmap);
idmap->idmap_key_cons = NULL;
mutex_unlock(&idmap->idmap_mutex);
}
return ret;
@ -465,8 +465,6 @@ nfs_idmap_new(struct nfs_client *clp)
struct rpc_pipe *pipe;
int error;
BUG_ON(clp->cl_idmap != NULL);
idmap = kzalloc(sizeof(*idmap), GFP_KERNEL);
if (idmap == NULL)
return -ENOMEM;
@ -510,7 +508,6 @@ static int __rpc_pipefs_event(struct nfs_client *clp, unsigned long event,
switch (event) {
case RPC_PIPEFS_MOUNT:
BUG_ON(clp->cl_rpcclient->cl_dentry == NULL);
err = __nfs_idmap_register(clp->cl_rpcclient->cl_dentry,
clp->cl_idmap,
clp->cl_idmap->idmap_pipe);
@ -662,6 +659,35 @@ static int nfs_idmap_prepare_message(char *desc, struct idmap *idmap,
return ret;
}
static bool
nfs_idmap_prepare_pipe_upcall(struct idmap *idmap,
struct idmap_legacy_upcalldata *data)
{
if (idmap->idmap_upcall_data != NULL) {
WARN_ON_ONCE(1);
return false;
}
idmap->idmap_upcall_data = data;
return true;
}
static void
nfs_idmap_complete_pipe_upcall_locked(struct idmap *idmap, int ret)
{
struct key_construction *cons = idmap->idmap_upcall_data->key_cons;
kfree(idmap->idmap_upcall_data);
idmap->idmap_upcall_data = NULL;
complete_request_key(cons, ret);
}
static void
nfs_idmap_abort_pipe_upcall(struct idmap *idmap, int ret)
{
if (idmap->idmap_upcall_data != NULL)
nfs_idmap_complete_pipe_upcall_locked(idmap, ret);
}
static int nfs_idmap_legacy_upcall(struct key_construction *cons,
const char *op,
void *aux)
@ -686,17 +712,15 @@ static int nfs_idmap_legacy_upcall(struct key_construction *cons,
if (ret < 0)
goto out2;
BUG_ON(idmap->idmap_key_cons != NULL);
idmap->idmap_key_cons = cons;
ret = -EAGAIN;
if (!nfs_idmap_prepare_pipe_upcall(idmap, data))
goto out2;
ret = rpc_queue_upcall(idmap->idmap_pipe, msg);
if (ret < 0)
goto out3;
nfs_idmap_abort_pipe_upcall(idmap, ret);
return ret;
out3:
idmap->idmap_key_cons = NULL;
out2:
kfree(data);
out1:
@ -711,21 +735,32 @@ static int nfs_idmap_instantiate(struct key *key, struct key *authkey, char *dat
authkey);
}
static int nfs_idmap_read_message(struct idmap_msg *im, struct key *key, struct key *authkey)
static int nfs_idmap_read_and_verify_message(struct idmap_msg *im,
struct idmap_msg *upcall,
struct key *key, struct key *authkey)
{
char id_str[NFS_UINT_MAXLEN];
int ret = -EINVAL;
int ret = -ENOKEY;
/* ret = -ENOKEY */
if (upcall->im_type != im->im_type || upcall->im_conv != im->im_conv)
goto out;
switch (im->im_conv) {
case IDMAP_CONV_NAMETOID:
if (strcmp(upcall->im_name, im->im_name) != 0)
break;
sprintf(id_str, "%d", im->im_id);
ret = nfs_idmap_instantiate(key, authkey, id_str);
break;
case IDMAP_CONV_IDTONAME:
if (upcall->im_id != im->im_id)
break;
ret = nfs_idmap_instantiate(key, authkey, im->im_name);
break;
default:
ret = -EINVAL;
}
out:
return ret;
}
@ -737,14 +772,16 @@ idmap_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
struct key_construction *cons;
struct idmap_msg im;
size_t namelen_in;
int ret;
int ret = -ENOKEY;
/* If instantiation is successful, anyone waiting for key construction
* will have been woken up and someone else may now have used
* idmap_key_cons - so after this point we may no longer touch it.
*/
cons = ACCESS_ONCE(idmap->idmap_key_cons);
idmap->idmap_key_cons = NULL;
if (idmap->idmap_upcall_data == NULL)
goto out_noupcall;
cons = idmap->idmap_upcall_data->key_cons;
if (mlen != sizeof(im)) {
ret = -ENOSPC;
@ -765,16 +802,19 @@ idmap_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
if (namelen_in == 0 || namelen_in == IDMAP_NAMESZ) {
ret = -EINVAL;
goto out;
}
}
ret = nfs_idmap_read_message(&im, cons->key, cons->authkey);
ret = nfs_idmap_read_and_verify_message(&im,
&idmap->idmap_upcall_data->idmap_msg,
cons->key, cons->authkey);
if (ret >= 0) {
key_set_timeout(cons->key, nfs_idmap_cache_timeout);
ret = mlen;
}
out:
complete_request_key(cons, ret);
nfs_idmap_complete_pipe_upcall_locked(idmap, ret);
out_noupcall:
return ret;
}
@ -785,14 +825,9 @@ idmap_pipe_destroy_msg(struct rpc_pipe_msg *msg)
struct idmap_legacy_upcalldata,
pipe_msg);
struct idmap *idmap = data->idmap;
struct key_construction *cons;
if (msg->errno) {
cons = ACCESS_ONCE(idmap->idmap_key_cons);
idmap->idmap_key_cons = NULL;
complete_request_key(cons, msg->errno);
}
/* Free memory allocated in nfs_idmap_legacy_upcall() */
kfree(data);
if (msg->errno)
nfs_idmap_abort_pipe_upcall(idmap, msg->errno);
}
static void
@ -800,7 +835,8 @@ idmap_release_pipe(struct inode *inode)
{
struct rpc_inode *rpci = RPC_I(inode);
struct idmap *idmap = (struct idmap *)rpci->private;
idmap->idmap_key_cons = NULL;
nfs_idmap_abort_pipe_upcall(idmap, -EPIPE);
}
int nfs_map_name_to_uid(const struct nfs_server *server, const char *name, size_t namelen, __u32 *uid)