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Diffstat (limited to 'fs/nfs/delegation.c')
-rw-r--r--fs/nfs/delegation.c260
1 files changed, 132 insertions, 128 deletions
diff --git a/fs/nfs/delegation.c b/fs/nfs/delegation.c
index cc563cfa6940..968225a88015 100644
--- a/fs/nfs/delegation.c
+++ b/fs/nfs/delegation.c
@@ -43,6 +43,27 @@ static void nfs_free_delegation(struct nfs_delegation *delegation)
put_rpccred(cred);
}
+void nfs_mark_delegation_referenced(struct nfs_delegation *delegation)
+{
+ set_bit(NFS_DELEGATION_REFERENCED, &delegation->flags);
+}
+
+int nfs_have_delegation(struct inode *inode, fmode_t flags)
+{
+ struct nfs_delegation *delegation;
+ int ret = 0;
+
+ flags &= FMODE_READ|FMODE_WRITE;
+ rcu_read_lock();
+ delegation = rcu_dereference(NFS_I(inode)->delegation);
+ if (delegation != NULL && (delegation->type & flags) == flags) {
+ nfs_mark_delegation_referenced(delegation);
+ ret = 1;
+ }
+ rcu_read_unlock();
+ return ret;
+}
+
static int nfs_delegation_claim_locks(struct nfs_open_context *ctx, struct nfs4_state *state)
{
struct inode *inode = state->inode;
@@ -119,7 +140,7 @@ void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, st
delegation->maxsize = res->maxsize;
oldcred = delegation->cred;
delegation->cred = get_rpccred(cred);
- delegation->flags &= ~NFS_DELEGATION_NEED_RECLAIM;
+ clear_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags);
NFS_I(inode)->delegation_state = delegation->type;
smp_wmb();
put_rpccred(oldcred);
@@ -134,19 +155,35 @@ static int nfs_do_return_delegation(struct inode *inode, struct nfs_delegation *
return res;
}
+static struct inode *nfs_delegation_grab_inode(struct nfs_delegation *delegation)
+{
+ struct inode *inode = NULL;
+
+ spin_lock(&delegation->lock);
+ if (delegation->inode != NULL)
+ inode = igrab(delegation->inode);
+ spin_unlock(&delegation->lock);
+ return inode;
+}
+
static struct nfs_delegation *nfs_detach_delegation_locked(struct nfs_inode *nfsi, const nfs4_stateid *stateid)
{
struct nfs_delegation *delegation = rcu_dereference(nfsi->delegation);
if (delegation == NULL)
goto nomatch;
+ spin_lock(&delegation->lock);
if (stateid != NULL && memcmp(delegation->stateid.data, stateid->data,
sizeof(delegation->stateid.data)) != 0)
- goto nomatch;
+ goto nomatch_unlock;
list_del_rcu(&delegation->super_list);
+ delegation->inode = NULL;
nfsi->delegation_state = 0;
rcu_assign_pointer(nfsi->delegation, NULL);
+ spin_unlock(&delegation->lock);
return delegation;
+nomatch_unlock:
+ spin_unlock(&delegation->lock);
nomatch:
return NULL;
}
@@ -172,6 +209,8 @@ int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct
delegation->change_attr = nfsi->change_attr;
delegation->cred = get_rpccred(cred);
delegation->inode = inode;
+ delegation->flags = 1<<NFS_DELEGATION_REFERENCED;
+ spin_lock_init(&delegation->lock);
spin_lock(&clp->cl_lock);
if (rcu_dereference(nfsi->delegation) != NULL) {
@@ -226,22 +265,47 @@ static void nfs_msync_inode(struct inode *inode)
*/
static int __nfs_inode_return_delegation(struct inode *inode, struct nfs_delegation *delegation)
{
- struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
struct nfs_inode *nfsi = NFS_I(inode);
nfs_msync_inode(inode);
- down_read(&clp->cl_sem);
/* Guard against new delegated open calls */
down_write(&nfsi->rwsem);
nfs_delegation_claim_opens(inode, &delegation->stateid);
up_write(&nfsi->rwsem);
- up_read(&clp->cl_sem);
nfs_msync_inode(inode);
return nfs_do_return_delegation(inode, delegation, 1);
}
/*
+ * Return all delegations that have been marked for return
+ */
+void nfs_client_return_marked_delegations(struct nfs_client *clp)
+{
+ struct nfs_delegation *delegation;
+ struct inode *inode;
+
+restart:
+ rcu_read_lock();
+ list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) {
+ if (!test_and_clear_bit(NFS_DELEGATION_RETURN, &delegation->flags))
+ continue;
+ inode = nfs_delegation_grab_inode(delegation);
+ if (inode == NULL)
+ continue;
+ spin_lock(&clp->cl_lock);
+ delegation = nfs_detach_delegation_locked(NFS_I(inode), NULL);
+ spin_unlock(&clp->cl_lock);
+ rcu_read_unlock();
+ if (delegation != NULL)
+ __nfs_inode_return_delegation(inode, delegation);
+ iput(inode);
+ goto restart;
+ }
+ rcu_read_unlock();
+}
+
+/*
* This function returns the delegation without reclaiming opens
* or protecting against delegation reclaims.
* It is therefore really only safe to be called from
@@ -279,83 +343,55 @@ int nfs_inode_return_delegation(struct inode *inode)
return err;
}
+static void nfs_mark_return_delegation(struct nfs_client *clp, struct nfs_delegation *delegation)
+{
+ set_bit(NFS_DELEGATION_RETURN, &delegation->flags);
+ set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state);
+}
+
/*
* Return all delegations associated to a super block
*/
-void nfs_return_all_delegations(struct super_block *sb)
+void nfs_super_return_all_delegations(struct super_block *sb)
{
struct nfs_client *clp = NFS_SB(sb)->nfs_client;
struct nfs_delegation *delegation;
- struct inode *inode;
if (clp == NULL)
return;
-restart:
rcu_read_lock();
list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) {
- if (delegation->inode->i_sb != sb)
- continue;
- inode = igrab(delegation->inode);
- if (inode == NULL)
- continue;
- spin_lock(&clp->cl_lock);
- delegation = nfs_detach_delegation_locked(NFS_I(inode), NULL);
- spin_unlock(&clp->cl_lock);
- rcu_read_unlock();
- if (delegation != NULL)
- __nfs_inode_return_delegation(inode, delegation);
- iput(inode);
- goto restart;
+ spin_lock(&delegation->lock);
+ if (delegation->inode != NULL && delegation->inode->i_sb == sb)
+ set_bit(NFS_DELEGATION_RETURN, &delegation->flags);
+ spin_unlock(&delegation->lock);
}
rcu_read_unlock();
+ nfs_client_return_marked_delegations(clp);
}
-static int nfs_do_expire_all_delegations(void *ptr)
+static void nfs_client_mark_return_all_delegations(struct nfs_client *clp)
{
- struct nfs_client *clp = ptr;
struct nfs_delegation *delegation;
- struct inode *inode;
- allow_signal(SIGKILL);
-restart:
- if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) != 0)
- goto out;
- if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0)
- goto out;
rcu_read_lock();
list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) {
- inode = igrab(delegation->inode);
- if (inode == NULL)
- continue;
- spin_lock(&clp->cl_lock);
- delegation = nfs_detach_delegation_locked(NFS_I(inode), NULL);
- spin_unlock(&clp->cl_lock);
- rcu_read_unlock();
- if (delegation)
- __nfs_inode_return_delegation(inode, delegation);
- iput(inode);
- goto restart;
+ set_bit(NFS_DELEGATION_RETURN, &delegation->flags);
+ set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state);
}
rcu_read_unlock();
-out:
- nfs_put_client(clp);
- module_put_and_exit(0);
+}
+
+static void nfs_delegation_run_state_manager(struct nfs_client *clp)
+{
+ if (test_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state))
+ nfs4_schedule_state_manager(clp);
}
void nfs_expire_all_delegations(struct nfs_client *clp)
{
- struct task_struct *task;
-
- __module_get(THIS_MODULE);
- atomic_inc(&clp->cl_count);
- task = kthread_run(nfs_do_expire_all_delegations, clp,
- "%s-delegreturn",
- rpc_peeraddr2str(clp->cl_rpcclient,
- RPC_DISPLAY_ADDR));
- if (!IS_ERR(task))
- return;
- nfs_put_client(clp);
- module_put(THIS_MODULE);
+ nfs_client_mark_return_all_delegations(clp);
+ nfs_delegation_run_state_manager(clp);
}
/*
@@ -363,68 +399,29 @@ void nfs_expire_all_delegations(struct nfs_client *clp)
*/
void nfs_handle_cb_pathdown(struct nfs_client *clp)
{
- struct nfs_delegation *delegation;
- struct inode *inode;
-
if (clp == NULL)
return;
-restart:
+ nfs_client_mark_return_all_delegations(clp);
+}
+
+static void nfs_client_mark_return_unreferenced_delegations(struct nfs_client *clp)
+{
+ struct nfs_delegation *delegation;
+
rcu_read_lock();
list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) {
- inode = igrab(delegation->inode);
- if (inode == NULL)
+ if (test_and_clear_bit(NFS_DELEGATION_REFERENCED, &delegation->flags))
continue;
- spin_lock(&clp->cl_lock);
- delegation = nfs_detach_delegation_locked(NFS_I(inode), NULL);
- spin_unlock(&clp->cl_lock);
- rcu_read_unlock();
- if (delegation != NULL)
- __nfs_inode_return_delegation(inode, delegation);
- iput(inode);
- goto restart;
+ set_bit(NFS_DELEGATION_RETURN, &delegation->flags);
+ set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state);
}
rcu_read_unlock();
}
-struct recall_threadargs {
- struct inode *inode;
- struct nfs_client *clp;
- const nfs4_stateid *stateid;
-
- struct completion started;
- int result;
-};
-
-static int recall_thread(void *data)
+void nfs_expire_unreferenced_delegations(struct nfs_client *clp)
{
- struct recall_threadargs *args = (struct recall_threadargs *)data;
- struct inode *inode = igrab(args->inode);
- struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
- struct nfs_inode *nfsi = NFS_I(inode);
- struct nfs_delegation *delegation;
-
- daemonize("nfsv4-delegreturn");
-
- nfs_msync_inode(inode);
- down_read(&clp->cl_sem);
- down_write(&nfsi->rwsem);
- spin_lock(&clp->cl_lock);
- delegation = nfs_detach_delegation_locked(nfsi, args->stateid);
- if (delegation != NULL)
- args->result = 0;
- else
- args->result = -ENOENT;
- spin_unlock(&clp->cl_lock);
- complete(&args->started);
- nfs_delegation_claim_opens(inode, args->stateid);
- up_write(&nfsi->rwsem);
- up_read(&clp->cl_sem);
- nfs_msync_inode(inode);
-
- if (delegation != NULL)
- nfs_do_return_delegation(inode, delegation, 1);
- iput(inode);
- module_put_and_exit(0);
+ nfs_client_mark_return_unreferenced_delegations(clp);
+ nfs_delegation_run_state_manager(clp);
}
/*
@@ -432,22 +429,20 @@ static int recall_thread(void *data)
*/
int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *stateid)
{
- struct recall_threadargs data = {
- .inode = inode,
- .stateid = stateid,
- };
- int status;
+ struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
+ struct nfs_delegation *delegation;
- init_completion(&data.started);
- __module_get(THIS_MODULE);
- status = kernel_thread(recall_thread, &data, CLONE_KERNEL);
- if (status < 0)
- goto out_module_put;
- wait_for_completion(&data.started);
- return data.result;
-out_module_put:
- module_put(THIS_MODULE);
- return status;
+ rcu_read_lock();
+ delegation = rcu_dereference(NFS_I(inode)->delegation);
+ if (delegation == NULL || memcmp(delegation->stateid.data, stateid->data,
+ sizeof(delegation->stateid.data)) != 0) {
+ rcu_read_unlock();
+ return -ENOENT;
+ }
+ nfs_mark_return_delegation(clp, delegation);
+ rcu_read_unlock();
+ nfs_delegation_run_state_manager(clp);
+ return 0;
}
/*
@@ -459,10 +454,14 @@ struct inode *nfs_delegation_find_inode(struct nfs_client *clp, const struct nfs
struct inode *res = NULL;
rcu_read_lock();
list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) {
- if (nfs_compare_fh(fhandle, &NFS_I(delegation->inode)->fh) == 0) {
+ spin_lock(&delegation->lock);
+ if (delegation->inode != NULL &&
+ nfs_compare_fh(fhandle, &NFS_I(delegation->inode)->fh) == 0) {
res = igrab(delegation->inode);
- break;
}
+ spin_unlock(&delegation->lock);
+ if (res != NULL)
+ break;
}
rcu_read_unlock();
return res;
@@ -476,7 +475,7 @@ void nfs_delegation_mark_reclaim(struct nfs_client *clp)
struct nfs_delegation *delegation;
rcu_read_lock();
list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list)
- delegation->flags |= NFS_DELEGATION_NEED_RECLAIM;
+ set_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags);
rcu_read_unlock();
}
@@ -486,17 +485,22 @@ void nfs_delegation_mark_reclaim(struct nfs_client *clp)
void nfs_delegation_reap_unclaimed(struct nfs_client *clp)
{
struct nfs_delegation *delegation;
+ struct inode *inode;
restart:
rcu_read_lock();
list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) {
- if ((delegation->flags & NFS_DELEGATION_NEED_RECLAIM) == 0)
+ if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0)
+ continue;
+ inode = nfs_delegation_grab_inode(delegation);
+ if (inode == NULL)
continue;
spin_lock(&clp->cl_lock);
- delegation = nfs_detach_delegation_locked(NFS_I(delegation->inode), NULL);
+ delegation = nfs_detach_delegation_locked(NFS_I(inode), NULL);
spin_unlock(&clp->cl_lock);
rcu_read_unlock();
if (delegation != NULL)
nfs_free_delegation(delegation);
+ iput(inode);
goto restart;
}
rcu_read_unlock();