Commit 9b206149 authored by Trond Myklebust's avatar Trond Myklebust
Browse files

NFSv4: The stateid must remain the same for replayed RPC calls 



If we replay a READ or WRITE call, we should not be changing the
stateid. Currently, we may end up doing so, because the stateid
is only selected at xdr encode time.

This patch ensures that we select the stateid after we get an NFSv4.1
session slot, and that we keep that same stateid across retries.

Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
parent 8c86899f

fs/nfs/nfs4_fs.h

+4 −0
Original line number Diff line number Diff line
@@ -234,6 +234,10 @@ extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *, struct qstr 
extern int nfs4_proc_secinfo(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *);

extern int nfs4_release_lockowner(struct nfs4_lock_state *);

extern const struct xattr_handler *nfs4_xattr_handlers[];

extern void nfs4_set_rw_stateid(nfs4_stateid *stateid,

		const struct nfs_open_context *ctx,

		const struct nfs_lock_context *l_ctx,

		fmode_t fmode);



#if defined(CONFIG_NFS_V4_1)

static inline struct nfs4_session *nfs4_get_session(const struct nfs_server *server)

fs/nfs/nfs4filelayout.c

+10 −4
Original line number Diff line number Diff line
@@ -317,10 +317,13 @@ static void filelayout_read_prepare(struct rpc_task *task, void *data) 
	}

	rdata->read_done_cb = filelayout_read_done_cb;



	nfs41_setup_sequence(rdata->ds_clp->cl_session,

	if (nfs41_setup_sequence(rdata->ds_clp->cl_session,

			&rdata->args.seq_args,

			&rdata->res.seq_res,

			task);

			task))

		return;

	nfs4_set_rw_stateid(&rdata->args.stateid, rdata->args.context,

			rdata->args.lock_context, FMODE_READ);

}



static void filelayout_read_call_done(struct rpc_task *task, void *data)
@@ -421,10 +424,13 @@ static void filelayout_write_prepare(struct rpc_task *task, void *data) 
		rpc_exit(task, 0);

		return;

	}

	nfs41_setup_sequence(wdata->ds_clp->cl_session,

	if (nfs41_setup_sequence(wdata->ds_clp->cl_session,

			&wdata->args.seq_args,

			&wdata->res.seq_res,

			task);

			task))

		return;

	nfs4_set_rw_stateid(&wdata->args.stateid, wdata->args.context,

			wdata->args.lock_context, FMODE_WRITE);

}



static void filelayout_write_call_done(struct rpc_task *task, void *data)

fs/nfs/nfs4proc.c

+23 −4
Original line number Diff line number Diff line
@@ -3454,6 +3454,19 @@ static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 
	return err;

}



void nfs4_set_rw_stateid(nfs4_stateid *stateid,

		const struct nfs_open_context *ctx,

		const struct nfs_lock_context *l_ctx,

		fmode_t fmode)

{

	const struct nfs_lockowner *lockowner = NULL;



	if (l_ctx != NULL)

		lockowner = &l_ctx->lockowner;

	nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);

}

EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);



void __nfs4_read_done_cb(struct nfs_read_data *data)

{

	nfs_invalidate_atime(data->header->inode);
@@ -3496,10 +3509,13 @@ static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message 


static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)

{

	nfs4_setup_sequence(NFS_SERVER(data->header->inode),

	if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),

			&data->args.seq_args,

			&data->res.seq_res,

			task);

			task))

		return;

	nfs4_set_rw_stateid(&data->args.stateid, data->args.context,

			data->args.lock_context, FMODE_READ);

}



static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
@@ -3560,10 +3576,13 @@ static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_messag 


static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)

{

	nfs4_setup_sequence(NFS_SERVER(data->header->inode),

	if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),

			&data->args.seq_args,

			&data->res.seq_res,

			task);

			task))

		return;

	nfs4_set_rw_stateid(&data->args.stateid, data->args.context,

			data->args.lock_context, FMODE_WRITE);

}



static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)

fs/nfs/nfs4xdr.c

+2 −26
Original line number Diff line number Diff line
@@ -1506,35 +1506,12 @@ static void encode_putrootfh(struct xdr_stream *xdr, struct compound_hdr *hdr) 
	encode_op_hdr(xdr, OP_PUTROOTFH, decode_putrootfh_maxsz, hdr);

}



static void encode_open_stateid(struct xdr_stream *xdr,

		const struct nfs_open_context *ctx,

		const struct nfs_lock_context *l_ctx,

		fmode_t fmode,

		int zero_seqid)

{

	nfs4_stateid stateid;



	if (ctx->state != NULL) {

		const struct nfs_lockowner *lockowner = NULL;



		if (l_ctx != NULL)

			lockowner = &l_ctx->lockowner;

		nfs4_select_rw_stateid(&stateid, ctx->state,

				fmode, lockowner);

		if (zero_seqid)

			stateid.seqid = 0;

		encode_nfs4_stateid(xdr, &stateid);

	} else

		encode_nfs4_stateid(xdr, &zero_stateid);

}



static void encode_read(struct xdr_stream *xdr, const struct nfs_readargs *args, struct compound_hdr *hdr)

{

	__be32 *p;



	encode_op_hdr(xdr, OP_READ, decode_read_maxsz, hdr);

	encode_open_stateid(xdr, args->context, args->lock_context,

			FMODE_READ, hdr->minorversion);

	encode_nfs4_stateid(xdr, &args->stateid);



	p = reserve_space(xdr, 12);

	p = xdr_encode_hyper(p, args->offset);
@@ -1670,8 +1647,7 @@ static void encode_write(struct xdr_stream *xdr, const struct nfs_writeargs *arg 
	__be32 *p;



	encode_op_hdr(xdr, OP_WRITE, decode_write_maxsz, hdr);

	encode_open_stateid(xdr, args->context, args->lock_context,

			FMODE_WRITE, hdr->minorversion);

	encode_nfs4_stateid(xdr, &args->stateid);



	p = reserve_space(xdr, 16);

	p = xdr_encode_hyper(p, args->offset);

include/linux/nfs_xdr.h

+2 −0
Original line number Diff line number Diff line
@@ -486,6 +486,7 @@ struct nfs_readargs { 
	struct nfs_fh *		fh;

	struct nfs_open_context *context;

	struct nfs_lock_context *lock_context;

	nfs4_stateid		stateid;

	__u64			offset;

	__u32			count;

	unsigned int		pgbase;
@@ -507,6 +508,7 @@ struct nfs_writeargs { 
	struct nfs_fh *		fh;

	struct nfs_open_context *context;

	struct nfs_lock_context *lock_context;

	nfs4_stateid		stateid;

	__u64			offset;

	__u32			count;

	enum nfs3_stable_how	stable;

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