Commit dda4b225 authored by Chuck Lever's avatar Chuck Lever Committed by Trond Myklebust
Browse files

NFS: Introduce nfs_detach_delegations() 



Clean up:  Refactor code that takes clp->cl_lock and calls
nfs_detach_delegations_locked() into its own function.

While we're changing the call sites, get rid of the second parameter
and the logic in nfs_detach_delegations_locked() that uses it, since
callers always set that parameter of nfs_detach_delegations_locked()
to NULL.

Signed-off-by: default avatarChuck Lever <chuck.lever@oracle.com>
Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
parent 24d292b8

fs/nfs/delegation.c

+20 −21
Original line number Diff line number Diff line
@@ -175,8 +175,8 @@ static struct inode *nfs_delegation_grab_inode(struct nfs_delegation *delegation 
	return inode;

}



static struct nfs_delegation *nfs_detach_delegation_locked(struct nfs_inode *nfsi,

							   const nfs4_stateid *stateid,

static struct nfs_delegation *

nfs_detach_delegation_locked(struct nfs_inode *nfsi,

			     struct nfs_client *clp)

{

	struct nfs_delegation *delegation =
@@ -185,22 +185,29 @@ static struct nfs_delegation *nfs_detach_delegation_locked(struct nfs_inode *nfs 


	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_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;

}



static struct nfs_delegation *nfs_detach_delegation(struct nfs_inode *nfsi,

						    struct nfs_client *clp)

{

	struct nfs_delegation *delegation;



	spin_lock(&clp->cl_lock);

	delegation = nfs_detach_delegation_locked(nfsi, clp);

	spin_unlock(&clp->cl_lock);

	return delegation;

}



/*

 * Set up a delegation on an inode

 */
@@ -246,7 +253,7 @@ int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct 
			delegation = NULL;

			goto out;

		}

		freeme = nfs_detach_delegation_locked(nfsi, NULL, clp);

		freeme = nfs_detach_delegation_locked(nfsi, clp);

	}

	list_add_rcu(&delegation->super_list, &clp->cl_delegations);

	nfsi->delegation_state = delegation->type;
@@ -307,9 +314,7 @@ restart: 
		inode = nfs_delegation_grab_inode(delegation);

		if (inode == NULL)

			continue;

		spin_lock(&clp->cl_lock);

		delegation = nfs_detach_delegation_locked(NFS_I(inode), NULL, clp);

		spin_unlock(&clp->cl_lock);

		delegation = nfs_detach_delegation(NFS_I(inode), clp);

		rcu_read_unlock();

		if (delegation != NULL) {

			filemap_flush(inode->i_mapping);
@@ -338,9 +343,7 @@ void nfs_inode_return_delegation_noreclaim(struct inode *inode) 
	struct nfs_delegation *delegation;



	if (rcu_access_pointer(nfsi->delegation) != NULL) {

		spin_lock(&clp->cl_lock);

		delegation = nfs_detach_delegation_locked(nfsi, NULL, clp);

		spin_unlock(&clp->cl_lock);

		delegation = nfs_detach_delegation(nfsi, clp);

		if (delegation != NULL)

			nfs_do_return_delegation(inode, delegation, 0);

	}
@@ -354,9 +357,7 @@ int nfs_inode_return_delegation(struct inode *inode) 
	int err = 0;



	if (rcu_access_pointer(nfsi->delegation) != NULL) {

		spin_lock(&clp->cl_lock);

		delegation = nfs_detach_delegation_locked(nfsi, NULL, clp);

		spin_unlock(&clp->cl_lock);

		delegation = nfs_detach_delegation(nfsi, clp);

		if (delegation != NULL) {

			nfs_wb_all(inode);

			err = __nfs_inode_return_delegation(inode, delegation, 1);
@@ -530,9 +531,7 @@ restart: 
		inode = nfs_delegation_grab_inode(delegation);

		if (inode == NULL)

			continue;

		spin_lock(&clp->cl_lock);

		delegation = nfs_detach_delegation_locked(NFS_I(inode), NULL, clp);

		spin_unlock(&clp->cl_lock);

		delegation = nfs_detach_delegation(NFS_I(inode), clp);

		rcu_read_unlock();

		if (delegation != NULL)

			nfs_free_delegation(delegation);

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