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Commit 4fc8796d authored by Trond Myklebust's avatar Trond Myklebust
Browse files

NFSv4: Clean up nfs4_select_rw_stateid()



Ensure that we select delegation stateids first, then
lock stateids and then open stateids.

Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
parent 0032a7a7
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+2 −1
Original line number Diff line number Diff line
@@ -330,7 +330,8 @@ extern void nfs41_handle_server_scope(struct nfs_client *,
				      struct server_scope **);
extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);
extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
extern void nfs4_select_rw_stateid(nfs4_stateid *, struct nfs4_state *, fl_owner_t, pid_t);
extern void nfs4_select_rw_stateid(nfs4_stateid *, struct nfs4_state *,
		fmode_t, fl_owner_t, pid_t);

extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask);
extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task);
+5 −3
Original line number Diff line number Diff line
@@ -1929,10 +1929,12 @@ static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,

	nfs_fattr_init(fattr);

	if (nfs4_copy_delegation_stateid(&arg.stateid, inode, FMODE_WRITE)) {
	if (state != NULL) {
		nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
				current->files, current->tgid);
	} else if (nfs4_copy_delegation_stateid(&arg.stateid, inode,
				FMODE_WRITE)) {
		/* Use that stateid */
	} else if (state != NULL) {
		nfs4_select_rw_stateid(&arg.stateid, state, current->files, current->tgid);
	} else
		nfs4_stateid_copy(&arg.stateid, &zero_stateid);

+33 −12
Original line number Diff line number Diff line
@@ -886,28 +886,49 @@ int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
	return 0;
}

/*
 * Byte-range lock aware utility to initialize the stateid of read/write
 * requests.
 */
void nfs4_select_rw_stateid(nfs4_stateid *dst, struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid)
static bool nfs4_copy_lock_stateid(nfs4_stateid *dst, struct nfs4_state *state,
		fl_owner_t fl_owner, pid_t fl_pid)
{
	struct nfs4_lock_state *lsp;
	int seq;
	bool ret = false;

	do {
		seq = read_seqbegin(&state->seqlock);
		nfs4_stateid_copy(dst, &state->stateid);
	} while (read_seqretry(&state->seqlock, seq));
	if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
		return;
		goto out;

	spin_lock(&state->state_lock);
	lsp = __nfs4_find_lock_state(state, fl_owner, fl_pid, NFS4_ANY_LOCK_TYPE);
	if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
	if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0) {
		nfs4_stateid_copy(dst, &lsp->ls_stateid);
		ret = true;
	}
	spin_unlock(&state->state_lock);
	nfs4_put_lock_state(lsp);
out:
	return ret;
}

static void nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
{
	int seq;

	do {
		seq = read_seqbegin(&state->seqlock);
		nfs4_stateid_copy(dst, &state->stateid);
	} while (read_seqretry(&state->seqlock, seq));
}

/*
 * Byte-range lock aware utility to initialize the stateid of read/write
 * requests.
 */
void nfs4_select_rw_stateid(nfs4_stateid *dst, struct nfs4_state *state,
		fmode_t fmode, fl_owner_t fl_owner, pid_t fl_pid)
{
	if (nfs4_copy_delegation_stateid(dst, state->inode, fmode))
		return;
	if (nfs4_copy_lock_stateid(dst, state, fl_owner, fl_pid))
		return;
	nfs4_copy_open_stateid(dst, state);
}

struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask)
+9 −4
Original line number Diff line number Diff line
@@ -1491,12 +1491,17 @@ 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, int zero_seqid)
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) {
		nfs4_select_rw_stateid(&stateid, ctx->state, l_ctx->lockowner, l_ctx->pid);
		nfs4_select_rw_stateid(&stateid, ctx->state,
				fmode, l_ctx->lockowner, l_ctx->pid);
		if (zero_seqid)
			stateid.seqid = 0;
		encode_nfs4_stateid(xdr, &stateid);
@@ -1510,7 +1515,7 @@ static void encode_read(struct xdr_stream *xdr, const struct nfs_readargs *args,

	encode_op_hdr(xdr, OP_READ, decode_read_maxsz, hdr);
	encode_open_stateid(xdr, args->context, args->lock_context,
		       hdr->minorversion);
			FMODE_READ, hdr->minorversion);

	p = reserve_space(xdr, 12);
	p = xdr_encode_hyper(p, args->offset);
@@ -1648,7 +1653,7 @@ static void encode_write(struct xdr_stream *xdr, const struct nfs_writeargs *arg

	encode_op_hdr(xdr, OP_WRITE, decode_write_maxsz, hdr);
	encode_open_stateid(xdr, args->context, args->lock_context,
		       hdr->minorversion);
			FMODE_WRITE, hdr->minorversion);

	p = reserve_space(xdr, 16);
	p = xdr_encode_hyper(p, args->offset);