return delegation;
}
+static void
+nfs_update_delegation_cred(struct nfs_delegation *delegation,
+ const struct cred *cred)
+{
+ const struct cred *old;
+
+ if (cred_fscmp(delegation->cred, cred) != 0) {
+ old = xchg(&delegation->cred, get_cred(cred));
+ put_cred(old);
+ }
+}
+
static void
nfs_update_inplace_delegation(struct nfs_delegation *delegation,
const struct nfs_delegation *update)
delegation->stateid.seqid = update->stateid.seqid;
smp_wmb();
delegation->type = update->type;
- if (test_and_clear_bit(NFS_DELEGATION_REVOKED, &delegation->flags))
+ delegation->pagemod_limit = update->pagemod_limit;
+ if (test_bit(NFS_DELEGATION_REVOKED, &delegation->flags)) {
+ delegation->change_attr = update->change_attr;
+ nfs_update_delegation_cred(delegation, update->cred);
+ /* smp_mb__before_atomic() is implicit due to xchg() */
+ clear_bit(NFS_DELEGATION_REVOKED, &delegation->flags);
atomic_long_inc(&nfs_active_delegations);
+ }
}
}
return ret;
}
-/**
- * nfs_client_return_marked_delegations - return previously marked delegations
- * @clp: nfs_client to process
- *
- * Note that this function is designed to be called by the state
- * manager thread. For this reason, it cannot flush the dirty data,
- * since that could deadlock in case of a state recovery error.
- *
- * Returns zero on success, or a negative errno value.
- */
-int nfs_client_return_marked_delegations(struct nfs_client *clp)
+static int nfs_server_return_marked_delegations(struct nfs_server *server,
+ void __always_unused *data)
{
struct nfs_delegation *delegation;
struct nfs_delegation *prev;
- struct nfs_server *server;
struct inode *inode;
struct inode *place_holder = NULL;
struct nfs_delegation *place_holder_deleg = NULL;
/*
* To avoid quadratic looping we hold a reference
* to an inode place_holder. Each time we restart, we
- * list nfs_servers from the server of that inode, and
- * delegation in the server from the delegations of that
- * inode.
+ * list delegation in the server from the delegations
+ * of that inode.
* prev is an RCU-protected pointer to a delegation which
* wasn't marked for return and might be a good choice for
* the next place_holder.
*/
- rcu_read_lock();
prev = NULL;
+ delegation = NULL;
+ rcu_read_lock();
if (place_holder)
- server = NFS_SERVER(place_holder);
- else
- server = list_entry_rcu(clp->cl_superblocks.next,
- struct nfs_server, client_link);
- list_for_each_entry_from_rcu(server, &clp->cl_superblocks, client_link) {
- delegation = NULL;
- if (place_holder && server == NFS_SERVER(place_holder))
- delegation = rcu_dereference(NFS_I(place_holder)->delegation);
- if (!delegation || delegation != place_holder_deleg)
- delegation = list_entry_rcu(server->delegations.next,
- struct nfs_delegation, super_list);
- list_for_each_entry_from_rcu(delegation, &server->delegations, super_list) {
- struct inode *to_put = NULL;
-
- if (!nfs_delegation_need_return(delegation)) {
+ delegation = rcu_dereference(NFS_I(place_holder)->delegation);
+ if (!delegation || delegation != place_holder_deleg)
+ delegation = list_entry_rcu(server->delegations.next,
+ struct nfs_delegation, super_list);
+ list_for_each_entry_from_rcu(delegation, &server->delegations, super_list) {
+ struct inode *to_put = NULL;
+
+ if (test_bit(NFS_DELEGATION_INODE_FREEING, &delegation->flags))
+ continue;
+ if (!nfs_delegation_need_return(delegation)) {
+ if (nfs4_is_valid_delegation(delegation, 0))
prev = delegation;
- continue;
- }
- if (!nfs_sb_active(server->super))
- break; /* continue in outer loop */
-
- if (prev) {
- struct inode *tmp;
-
- tmp = nfs_delegation_grab_inode(prev);
- if (tmp) {
- to_put = place_holder;
- place_holder = tmp;
- place_holder_deleg = prev;
- }
- }
+ continue;
+ }
- inode = nfs_delegation_grab_inode(delegation);
- if (inode == NULL) {
- rcu_read_unlock();
- if (to_put)
- iput(to_put);
- nfs_sb_deactive(server->super);
- goto restart;
+ if (prev) {
+ struct inode *tmp = nfs_delegation_grab_inode(prev);
+ if (tmp) {
+ to_put = place_holder;
+ place_holder = tmp;
+ place_holder_deleg = prev;
}
- delegation = nfs_start_delegation_return_locked(NFS_I(inode));
+ }
+
+ inode = nfs_delegation_grab_inode(delegation);
+ if (inode == NULL) {
rcu_read_unlock();
+ iput(to_put);
+ goto restart;
+ }
+ delegation = nfs_start_delegation_return_locked(NFS_I(inode));
+ rcu_read_unlock();
- if (to_put)
- iput(to_put);
+ iput(to_put);
- err = nfs_end_delegation_return(inode, delegation, 0);
- iput(inode);
- nfs_sb_deactive(server->super);
- cond_resched();
- if (!err)
- goto restart;
- set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state);
- if (place_holder)
- iput(place_holder);
- return err;
- }
+ err = nfs_end_delegation_return(inode, delegation, 0);
+ iput(inode);
+ cond_resched();
+ if (!err)
+ goto restart;
+ set_bit(NFS4CLNT_DELEGRETURN, &server->nfs_client->cl_state);
+ goto out;
}
rcu_read_unlock();
- if (place_holder)
- iput(place_holder);
- return 0;
+out:
+ iput(place_holder);
+ return err;
+}
+
+/**
+ * nfs_client_return_marked_delegations - return previously marked delegations
+ * @clp: nfs_client to process
+ *
+ * Note that this function is designed to be called by the state
+ * manager thread. For this reason, it cannot flush the dirty data,
+ * since that could deadlock in case of a state recovery error.
+ *
+ * Returns zero on success, or a negative errno value.
+ */
+int nfs_client_return_marked_delegations(struct nfs_client *clp)
+{
+ return nfs_client_for_each_server(clp,
+ nfs_server_return_marked_delegations, NULL);
}
/**
rcu_read_unlock();
}
-/**
- * nfs_delegation_reap_unclaimed - reap unclaimed delegations after reboot recovery is done
- * @clp: nfs_client to process
- *
- */
-void nfs_delegation_reap_unclaimed(struct nfs_client *clp)
+static int nfs_server_reap_unclaimed_delegations(struct nfs_server *server,
+ void __always_unused *data)
{
struct nfs_delegation *delegation;
- struct nfs_server *server;
struct inode *inode;
-
restart:
rcu_read_lock();
- list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
- list_for_each_entry_rcu(delegation, &server->delegations,
- super_list) {
- if (test_bit(NFS_DELEGATION_INODE_FREEING,
- &delegation->flags) ||
- test_bit(NFS_DELEGATION_RETURNING,
- &delegation->flags) ||
- test_bit(NFS_DELEGATION_NEED_RECLAIM,
- &delegation->flags) == 0)
- continue;
- if (!nfs_sb_active(server->super))
- break; /* continue in outer loop */
- inode = nfs_delegation_grab_inode(delegation);
- if (inode == NULL) {
- rcu_read_unlock();
- nfs_sb_deactive(server->super);
- goto restart;
- }
- delegation = nfs_start_delegation_return_locked(NFS_I(inode));
- rcu_read_unlock();
- if (delegation != NULL) {
- if (nfs_detach_delegation(NFS_I(inode), delegation,
- server) != NULL)
- nfs_free_delegation(delegation);
- /* Match nfs_start_delegation_return_locked */
- nfs_put_delegation(delegation);
- }
- iput(inode);
- nfs_sb_deactive(server->super);
- cond_resched();
- goto restart;
+restart_locked:
+ list_for_each_entry_rcu(delegation, &server->delegations, super_list) {
+ if (test_bit(NFS_DELEGATION_INODE_FREEING,
+ &delegation->flags) ||
+ test_bit(NFS_DELEGATION_RETURNING,
+ &delegation->flags) ||
+ test_bit(NFS_DELEGATION_NEED_RECLAIM,
+ &delegation->flags) == 0)
+ continue;
+ inode = nfs_delegation_grab_inode(delegation);
+ if (inode == NULL)
+ goto restart_locked;
+ delegation = nfs_start_delegation_return_locked(NFS_I(inode));
+ rcu_read_unlock();
+ if (delegation != NULL) {
+ if (nfs_detach_delegation(NFS_I(inode), delegation,
+ server) != NULL)
+ nfs_free_delegation(delegation);
+ /* Match nfs_start_delegation_return_locked */
+ nfs_put_delegation(delegation);
}
+ iput(inode);
+ cond_resched();
+ goto restart;
}
rcu_read_unlock();
+ return 0;
+}
+
+/**
+ * nfs_delegation_reap_unclaimed - reap unclaimed delegations after reboot recovery is done
+ * @clp: nfs_client to process
+ *
+ */
+void nfs_delegation_reap_unclaimed(struct nfs_client *clp)
+{
+ nfs_client_for_each_server(clp, nfs_server_reap_unclaimed_delegations,
+ NULL);
}
static inline bool nfs4_server_rebooted(const struct nfs_client *clp)
nfs_remove_bad_delegation(inode, stateid);
}
-/**
- * nfs_reap_expired_delegations - reap expired delegations
- * @clp: nfs_client to process
- *
- * Iterates through all the delegations associated with this server and
- * checks if they have may have been revoked. This function is usually
- * expected to be called in cases where the server may have lost its
- * lease.
- */
-void nfs_reap_expired_delegations(struct nfs_client *clp)
+static int nfs_server_reap_expired_delegations(struct nfs_server *server,
+ void __always_unused *data)
{
struct nfs_delegation *delegation;
- struct nfs_server *server;
struct inode *inode;
const struct cred *cred;
nfs4_stateid stateid;
-
restart:
rcu_read_lock();
- list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
- list_for_each_entry_rcu(delegation, &server->delegations,
- super_list) {
- if (test_bit(NFS_DELEGATION_INODE_FREEING,
- &delegation->flags) ||
- test_bit(NFS_DELEGATION_RETURNING,
- &delegation->flags) ||
- test_bit(NFS_DELEGATION_TEST_EXPIRED,
- &delegation->flags) == 0)
- continue;
- if (!nfs_sb_active(server->super))
- break; /* continue in outer loop */
- inode = nfs_delegation_grab_inode(delegation);
- if (inode == NULL) {
- rcu_read_unlock();
- nfs_sb_deactive(server->super);
- goto restart;
- }
- cred = get_cred_rcu(delegation->cred);
- nfs4_stateid_copy(&stateid, &delegation->stateid);
- clear_bit(NFS_DELEGATION_TEST_EXPIRED, &delegation->flags);
- rcu_read_unlock();
- nfs_delegation_test_free_expired(inode, &stateid, cred);
- put_cred(cred);
- if (nfs4_server_rebooted(clp)) {
- nfs_inode_mark_test_expired_delegation(server,inode);
- iput(inode);
- nfs_sb_deactive(server->super);
- return;
- }
+restart_locked:
+ list_for_each_entry_rcu(delegation, &server->delegations, super_list) {
+ if (test_bit(NFS_DELEGATION_INODE_FREEING,
+ &delegation->flags) ||
+ test_bit(NFS_DELEGATION_RETURNING,
+ &delegation->flags) ||
+ test_bit(NFS_DELEGATION_TEST_EXPIRED,
+ &delegation->flags) == 0)
+ continue;
+ inode = nfs_delegation_grab_inode(delegation);
+ if (inode == NULL)
+ goto restart_locked;
+ cred = get_cred_rcu(delegation->cred);
+ nfs4_stateid_copy(&stateid, &delegation->stateid);
+ clear_bit(NFS_DELEGATION_TEST_EXPIRED, &delegation->flags);
+ rcu_read_unlock();
+ nfs_delegation_test_free_expired(inode, &stateid, cred);
+ put_cred(cred);
+ if (!nfs4_server_rebooted(server->nfs_client)) {
iput(inode);
- nfs_sb_deactive(server->super);
cond_resched();
goto restart;
}
+ nfs_inode_mark_test_expired_delegation(server,inode);
+ iput(inode);
+ return -EAGAIN;
}
rcu_read_unlock();
+ return 0;
+}
+
+/**
+ * nfs_reap_expired_delegations - reap expired delegations
+ * @clp: nfs_client to process
+ *
+ * Iterates through all the delegations associated with this server and
+ * checks if they have may have been revoked. This function is usually
+ * expected to be called in cases where the server may have lost its
+ * lease.
+ */
+void nfs_reap_expired_delegations(struct nfs_client *clp)
+{
+ nfs_client_for_each_server(clp, nfs_server_reap_expired_delegations,
+ NULL);
}
void nfs_inode_find_delegation_state_and_recover(struct inode *inode,
projects / linux-2.6-microblaze.git / blobdiff