Commit bf6c8a81 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'nfs-for-3.8-4' of git://git.linux-nfs.org/projects/trondmy/linux-nfs

Pull NFS client bugfixes from Trond Myklebust:

 - Error reporting in nfs_xdev_mount incorrectly maps all errors to
   ENOMEM

 - Fix an NFSv4 refcounting issue

 - Fix a mount failure when the server reboots during NFSv4 trunking
   discovery

 - NFSv4.1 mounts may need to run the lease recovery thread.

 - Don't silently fail setattr() requests on mountpoints

 - Fix a SUNRPC socket/transport livelock and priority queue issue

 - We must handle NFS4ERR_DELAY when resetting the NFSv4.1 session.

* tag 'nfs-for-3.8-4' of git://git.linux-nfs.org/projects/trondmy/linux-nfs:
  NFSv4.1: Handle NFS4ERR_DELAY when resetting the NFSv4.1 session
  SUNRPC: When changing the queue priority, ensure that we change the owner
  NFS: Don't silently fail setattr() requests on mountpoints
  NFSv4.1: Ensure that nfs41_walk_client_list() does start lease recovery
  NFSv4: Fix NFSv4 trunking discovery
  NFSv4: Fix NFSv4 reference counting for trunked sessions
  NFS: Fix error reporting in nfs_xdev_mount
parents aeb8eede c489ee29
......@@ -177,11 +177,31 @@ out_nofree:
return mnt;
}
static int
nfs_namespace_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
{
if (NFS_FH(dentry->d_inode)->size != 0)
return nfs_getattr(mnt, dentry, stat);
generic_fillattr(dentry->d_inode, stat);
return 0;
}
static int
nfs_namespace_setattr(struct dentry *dentry, struct iattr *attr)
{
if (NFS_FH(dentry->d_inode)->size != 0)
return nfs_setattr(dentry, attr);
return -EACCES;
}
const struct inode_operations nfs_mountpoint_inode_operations = {
.getattr = nfs_getattr,
.setattr = nfs_setattr,
};
const struct inode_operations nfs_referral_inode_operations = {
.getattr = nfs_namespace_getattr,
.setattr = nfs_namespace_setattr,
};
static void nfs_expire_automounts(struct work_struct *work)
......
......@@ -236,11 +236,10 @@ struct nfs_client *nfs4_init_client(struct nfs_client *clp,
error = nfs4_discover_server_trunking(clp, &old);
if (error < 0)
goto error;
nfs_put_client(clp);
if (clp != old) {
clp->cl_preserve_clid = true;
nfs_put_client(clp);
clp = old;
atomic_inc(&clp->cl_count);
}
return clp;
......@@ -306,7 +305,7 @@ int nfs40_walk_client_list(struct nfs_client *new,
.clientid = new->cl_clientid,
.confirm = new->cl_confirm,
};
int status;
int status = -NFS4ERR_STALE_CLIENTID;
spin_lock(&nn->nfs_client_lock);
list_for_each_entry_safe(pos, n, &nn->nfs_client_list, cl_share_link) {
......@@ -332,40 +331,33 @@ int nfs40_walk_client_list(struct nfs_client *new,
if (prev)
nfs_put_client(prev);
prev = pos;
status = nfs4_proc_setclientid_confirm(pos, &clid, cred);
if (status == 0) {
switch (status) {
case -NFS4ERR_STALE_CLIENTID:
break;
case 0:
nfs4_swap_callback_idents(pos, new);
nfs_put_client(pos);
prev = NULL;
*result = pos;
dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
__func__, pos, atomic_read(&pos->cl_count));
return 0;
}
if (status != -NFS4ERR_STALE_CLIENTID) {
nfs_put_client(pos);
dprintk("NFS: <-- %s status = %d, no result\n",
__func__, status);
return status;
default:
goto out;
}
spin_lock(&nn->nfs_client_lock);
prev = pos;
}
spin_unlock(&nn->nfs_client_lock);
/*
* No matching nfs_client found. This should be impossible,
* because the new nfs_client has already been added to
* nfs_client_list by nfs_get_client().
*
* Don't BUG(), since the caller is holding a mutex.
*/
/* No match found. The server lost our clientid */
out:
if (prev)
nfs_put_client(prev);
spin_unlock(&nn->nfs_client_lock);
pr_err("NFS: %s Error: no matching nfs_client found\n", __func__);
return -NFS4ERR_STALE_CLIENTID;
dprintk("NFS: <-- %s status = %d\n", __func__, status);
return status;
}
#ifdef CONFIG_NFS_V4_1
......@@ -432,7 +424,7 @@ int nfs41_walk_client_list(struct nfs_client *new,
{
struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
struct nfs_client *pos, *n, *prev = NULL;
int error;
int status = -NFS4ERR_STALE_CLIENTID;
spin_lock(&nn->nfs_client_lock);
list_for_each_entry_safe(pos, n, &nn->nfs_client_list, cl_share_link) {
......@@ -448,14 +440,17 @@ int nfs41_walk_client_list(struct nfs_client *new,
nfs_put_client(prev);
prev = pos;
error = nfs_wait_client_init_complete(pos);
if (error < 0) {
nfs4_schedule_lease_recovery(pos);
status = nfs_wait_client_init_complete(pos);
if (status < 0) {
nfs_put_client(pos);
spin_lock(&nn->nfs_client_lock);
continue;
}
status = pos->cl_cons_state;
spin_lock(&nn->nfs_client_lock);
if (status < 0)
continue;
}
if (pos->rpc_ops != new->rpc_ops)
......@@ -473,6 +468,7 @@ int nfs41_walk_client_list(struct nfs_client *new,
if (!nfs4_match_serverowners(pos, new))
continue;
atomic_inc(&pos->cl_count);
spin_unlock(&nn->nfs_client_lock);
dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
__func__, pos, atomic_read(&pos->cl_count));
......@@ -481,16 +477,10 @@ int nfs41_walk_client_list(struct nfs_client *new,
return 0;
}
/*
* No matching nfs_client found. This should be impossible,
* because the new nfs_client has already been added to
* nfs_client_list by nfs_get_client().
*
* Don't BUG(), since the caller is holding a mutex.
*/
/* No matching nfs_client found. */
spin_unlock(&nn->nfs_client_lock);
pr_err("NFS: %s Error: no matching nfs_client found\n", __func__);
return -NFS4ERR_STALE_CLIENTID;
dprintk("NFS: <-- %s status = %d\n", __func__, status);
return status;
}
#endif /* CONFIG_NFS_V4_1 */
......
......@@ -136,16 +136,11 @@ int nfs40_discover_server_trunking(struct nfs_client *clp,
clp->cl_confirm = clid.confirm;
status = nfs40_walk_client_list(clp, result, cred);
switch (status) {
case -NFS4ERR_STALE_CLIENTID:
set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
case 0:
if (status == 0) {
/* Sustain the lease, even if it's empty. If the clientid4
* goes stale it's of no use for trunking discovery. */
nfs4_schedule_state_renewal(*result);
break;
}
out:
return status;
}
......@@ -1863,6 +1858,7 @@ again:
case -ETIMEDOUT:
case -EAGAIN:
ssleep(1);
case -NFS4ERR_STALE_CLIENTID:
dprintk("NFS: %s after status %d, retrying\n",
__func__, status);
goto again;
......@@ -2022,8 +2018,18 @@ static int nfs4_reset_session(struct nfs_client *clp)
nfs4_begin_drain_session(clp);
cred = nfs4_get_exchange_id_cred(clp);
status = nfs4_proc_destroy_session(clp->cl_session, cred);
if (status && status != -NFS4ERR_BADSESSION &&
status != -NFS4ERR_DEADSESSION) {
switch (status) {
case 0:
case -NFS4ERR_BADSESSION:
case -NFS4ERR_DEADSESSION:
break;
case -NFS4ERR_BACK_CHAN_BUSY:
case -NFS4ERR_DELAY:
set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
status = 0;
ssleep(1);
goto out;
default:
status = nfs4_recovery_handle_error(clp, status);
goto out;
}
......
......@@ -2589,27 +2589,23 @@ nfs_xdev_mount(struct file_system_type *fs_type, int flags,
struct nfs_server *server;
struct dentry *mntroot = ERR_PTR(-ENOMEM);
struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod;
int error;
dprintk("--> nfs_xdev_mount_common()\n");
dprintk("--> nfs_xdev_mount()\n");
mount_info.mntfh = mount_info.cloned->fh;
/* create a new volume representation */
server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
if (IS_ERR(server)) {
error = PTR_ERR(server);
goto out_err;
}
mntroot = nfs_fs_mount_common(server, flags, dev_name, &mount_info, nfs_mod);
dprintk("<-- nfs_xdev_mount_common() = 0\n");
out:
return mntroot;
if (IS_ERR(server))
mntroot = ERR_CAST(server);
else
mntroot = nfs_fs_mount_common(server, flags,
dev_name, &mount_info, nfs_mod);
out_err:
dprintk("<-- nfs_xdev_mount_common() = %d [error]\n", error);
goto out;
dprintk("<-- nfs_xdev_mount() = %ld\n",
IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L);
return mntroot;
}
#if IS_ENABLED(CONFIG_NFS_V4)
......
......@@ -98,9 +98,25 @@ __rpc_add_timer(struct rpc_wait_queue *queue, struct rpc_task *task)
list_add(&task->u.tk_wait.timer_list, &queue->timer_list.list);
}
static void rpc_rotate_queue_owner(struct rpc_wait_queue *queue)
{
struct list_head *q = &queue->tasks[queue->priority];
struct rpc_task *task;
if (!list_empty(q)) {
task = list_first_entry(q, struct rpc_task, u.tk_wait.list);
if (task->tk_owner == queue->owner)
list_move_tail(&task->u.tk_wait.list, q);
}
}
static void rpc_set_waitqueue_priority(struct rpc_wait_queue *queue, int priority)
{
queue->priority = priority;
if (queue->priority != priority) {
/* Fairness: rotate the list when changing priority */
rpc_rotate_queue_owner(queue);
queue->priority = priority;
}
}
static void rpc_set_waitqueue_owner(struct rpc_wait_queue *queue, pid_t pid)
......
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