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Commit 6c342655 authored by Trond Myklebust's avatar Trond Myklebust
Browse files

NFSv4: Return NFS4ERR_DELAY when a delegation recall fails due to igrab() 



If the attempt to recall the delegation fails because the inode is
in the process of being evicted from cache, then use NFS4ERR_DELAY
to ask the server to retry later.

Signed-off-by: default avatarTrond Myklebust <trond.myklebust@hammerspace.com>
parent 025bb9f8

fs/nfs/callback_proc.c

+6 −2
Original line number Diff line number Diff line
@@ -40,7 +40,9 @@ __be32 nfs4_callback_getattr(void *argp, void *resp, 
		rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));



	inode = nfs_delegation_find_inode(cps->clp, &args->fh);

	if (inode == NULL) {

	if (IS_ERR(inode)) {

		if (inode == ERR_PTR(-EAGAIN))

			res->status = htonl(NFS4ERR_DELAY);

		trace_nfs4_cb_getattr(cps->clp, &args->fh, NULL,

				-ntohl(res->status));

		goto out;
@@ -86,7 +88,9 @@ __be32 nfs4_callback_recall(void *argp, void *resp, 


	res = htonl(NFS4ERR_BADHANDLE);

	inode = nfs_delegation_find_inode(cps->clp, &args->fh);

	if (inode == NULL) {

	if (IS_ERR(inode)) {

		if (inode == ERR_PTR(-EAGAIN))

			res = htonl(NFS4ERR_DELAY);

		trace_nfs4_cb_recall(cps->clp, &args->fh, NULL,

				&args->stateid, -ntohl(res));

		goto out;

fs/nfs/delegation.c

+9 −7
Original line number Diff line number Diff line
@@ -856,12 +856,14 @@ nfs_delegation_find_inode_server(struct nfs_server *server, 
		if (delegation->inode != NULL &&

		    nfs_compare_fh(fhandle, &NFS_I(delegation->inode)->fh) == 0) {

			res = igrab(delegation->inode);

		}

			spin_unlock(&delegation->lock);

			if (res != NULL)

			break;

	}

				return res;

			return ERR_PTR(-EAGAIN);

		}

		spin_unlock(&delegation->lock);

	}

	return ERR_PTR(-ENOENT);

}



/**
@@ -876,16 +878,16 @@ struct inode *nfs_delegation_find_inode(struct nfs_client *clp, 
					const struct nfs_fh *fhandle)

{

	struct nfs_server *server;

	struct inode *res = NULL;

	struct inode *res;



	rcu_read_lock();

	list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {

		res = nfs_delegation_find_inode_server(server, fhandle);

		if (res != NULL)

			break;

		if (res != ERR_PTR(-ENOENT))

			return res;

	}

	rcu_read_unlock();

	return res;

	return ERR_PTR(-ENOENT);

}



static void nfs_delegation_mark_reclaim_server(struct nfs_server *server)