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