1 files changed, 651 insertions, 44 deletions

diff --git a/fs/nfs/nfs4filelayout.c b/fs/nfs/nfs4filelayout.c
index 23f930caf1e2..6f8192f4cfc7 100644
--- a/fs/nfs/nfs4filelayout.c
+++ b/fs/nfs/nfs4filelayout.c
@@ -40,32 +40,370 @@ MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Dean Hildebrand <dhildebz@umich.edu>");
 MODULE_DESCRIPTION("The NFSv4 file layout driver");
 
-static int
-filelayout_set_layoutdriver(struct nfs_server *nfss)
-{
-	int status = pnfs_alloc_init_deviceid_cache(nfss->nfs_client,
-						nfs4_fl_free_deviceid_callback);
-	if (status) {
-		printk(KERN_WARNING "%s: deviceid cache could not be "
-			"initialized\n", __func__);
-		return status;
+#define FILELAYOUT_POLL_RETRY_MAX     (15*HZ)
+
+static loff_t
+filelayout_get_dense_offset(struct nfs4_filelayout_segment *flseg,
+			    loff_t offset)
+{
+	u32 stripe_width = flseg->stripe_unit * flseg->dsaddr->stripe_count;
+	u64 tmp;
+
+	offset -= flseg->pattern_offset;
+	tmp = offset;
+	do_div(tmp, stripe_width);
+
+	return tmp * flseg->stripe_unit + do_div(offset, flseg->stripe_unit);
+}
+
+/* This function is used by the layout driver to calculate the
+ * offset of the file on the dserver based on whether the
+ * layout type is STRIPE_DENSE or STRIPE_SPARSE
+ */
+static loff_t
+filelayout_get_dserver_offset(struct pnfs_layout_segment *lseg, loff_t offset)
+{
+	struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
+
+	switch (flseg->stripe_type) {
+	case STRIPE_SPARSE:
+		return offset;
+
+	case STRIPE_DENSE:
+		return filelayout_get_dense_offset(flseg, offset);
+	}
+
+	BUG();
+}
+
+/* For data server errors we don't recover from */
+static void
+filelayout_set_lo_fail(struct pnfs_layout_segment *lseg)
+{
+	if (lseg->pls_range.iomode == IOMODE_RW) {
+		dprintk("%s Setting layout IOMODE_RW fail bit\n", __func__);
+		set_bit(lo_fail_bit(IOMODE_RW), &lseg->pls_layout->plh_flags);
+	} else {
+		dprintk("%s Setting layout IOMODE_READ fail bit\n", __func__);
+		set_bit(lo_fail_bit(IOMODE_READ), &lseg->pls_layout->plh_flags);
+	}
+}
+
+static int filelayout_async_handle_error(struct rpc_task *task,
+					 struct nfs4_state *state,
+					 struct nfs_client *clp,
+					 int *reset)
+{
+	if (task->tk_status >= 0)
+		return 0;
+
+	*reset = 0;
+
+	switch (task->tk_status) {
+	case -NFS4ERR_BADSESSION:
+	case -NFS4ERR_BADSLOT:
+	case -NFS4ERR_BAD_HIGH_SLOT:
+	case -NFS4ERR_DEADSESSION:
+	case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
+	case -NFS4ERR_SEQ_FALSE_RETRY:
+	case -NFS4ERR_SEQ_MISORDERED:
+		dprintk("%s ERROR %d, Reset session. Exchangeid "
+			"flags 0x%x\n", __func__, task->tk_status,
+			clp->cl_exchange_flags);
+		nfs4_schedule_session_recovery(clp->cl_session);
+		break;
+	case -NFS4ERR_DELAY:
+	case -NFS4ERR_GRACE:
+	case -EKEYEXPIRED:
+		rpc_delay(task, FILELAYOUT_POLL_RETRY_MAX);
+		break;
+	default:
+		dprintk("%s DS error. Retry through MDS %d\n", __func__,
+			task->tk_status);
+		*reset = 1;
+		break;
+	}
+	task->tk_status = 0;
+	return -EAGAIN;
+}
+
+/* NFS_PROTO call done callback routines */
+
+static int filelayout_read_done_cb(struct rpc_task *task,
+				struct nfs_read_data *data)
+{
+	struct nfs_client *clp = data->ds_clp;
+	int reset = 0;
+
+	dprintk("%s DS read\n", __func__);
+
+	if (filelayout_async_handle_error(task, data->args.context->state,
+					  data->ds_clp, &reset) == -EAGAIN) {
+		dprintk("%s calling restart ds_clp %p ds_clp->cl_session %p\n",
+			__func__, data->ds_clp, data->ds_clp->cl_session);
+		if (reset) {
+			filelayout_set_lo_fail(data->lseg);
+			nfs4_reset_read(task, data);
+			clp = NFS_SERVER(data->inode)->nfs_client;
+		}
+		nfs_restart_rpc(task, clp);
+		return -EAGAIN;
 	}
-	dprintk("%s: deviceid cache has been initialized successfully\n",
-		__func__);
+
 	return 0;
 }
 
-/* Clear out the layout by destroying its device list */
-static int
-filelayout_clear_layoutdriver(struct nfs_server *nfss)
+/*
+ * We reference the rpc_cred of the first WRITE that triggers the need for
+ * a LAYOUTCOMMIT, and use it to send the layoutcommit compound.
+ * rfc5661 is not clear about which credential should be used.
+ */
+static void
+filelayout_set_layoutcommit(struct nfs_write_data *wdata)
 {
-	dprintk("--> %s\n", __func__);
+	if (FILELAYOUT_LSEG(wdata->lseg)->commit_through_mds ||
+	    wdata->res.verf->committed == NFS_FILE_SYNC)
+		return;
+
+	pnfs_set_layoutcommit(wdata);
+	dprintk("%s ionde %lu pls_end_pos %lu\n", __func__, wdata->inode->i_ino,
+		(unsigned long) wdata->lseg->pls_end_pos);
+}
+
+/*
+ * Call ops for the async read/write cases
+ * In the case of dense layouts, the offset needs to be reset to its
+ * original value.
+ */
+static void filelayout_read_prepare(struct rpc_task *task, void *data)
+{
+	struct nfs_read_data *rdata = (struct nfs_read_data *)data;
+
+	rdata->read_done_cb = filelayout_read_done_cb;
+
+	if (nfs41_setup_sequence(rdata->ds_clp->cl_session,
+				&rdata->args.seq_args, &rdata->res.seq_res,
+				0, task))
+		return;
+
+	rpc_call_start(task);
+}
+
+static void filelayout_read_call_done(struct rpc_task *task, void *data)
+{
+	struct nfs_read_data *rdata = (struct nfs_read_data *)data;
+
+	dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status);
+
+	/* Note this may cause RPC to be resent */
+	rdata->mds_ops->rpc_call_done(task, data);
+}
+
+static void filelayout_read_release(void *data)
+{
+	struct nfs_read_data *rdata = (struct nfs_read_data *)data;
+
+	rdata->mds_ops->rpc_release(data);
+}
+
+static int filelayout_write_done_cb(struct rpc_task *task,
+				struct nfs_write_data *data)
+{
+	int reset = 0;
+
+	if (filelayout_async_handle_error(task, data->args.context->state,
+					  data->ds_clp, &reset) == -EAGAIN) {
+		struct nfs_client *clp;
+
+		dprintk("%s calling restart ds_clp %p ds_clp->cl_session %p\n",
+			__func__, data->ds_clp, data->ds_clp->cl_session);
+		if (reset) {
+			filelayout_set_lo_fail(data->lseg);
+			nfs4_reset_write(task, data);
+			clp = NFS_SERVER(data->inode)->nfs_client;
+		} else
+			clp = data->ds_clp;
+		nfs_restart_rpc(task, clp);
+		return -EAGAIN;
+	}
 
-	if (nfss->nfs_client->cl_devid_cache)
-		pnfs_put_deviceid_cache(nfss->nfs_client);
+	filelayout_set_layoutcommit(data);
 	return 0;
 }
 
+/* Fake up some data that will cause nfs_commit_release to retry the writes. */
+static void prepare_to_resend_writes(struct nfs_write_data *data)
+{
+	struct nfs_page *first = nfs_list_entry(data->pages.next);
+
+	data->task.tk_status = 0;
+	memcpy(data->verf.verifier, first->wb_verf.verifier,
+	       sizeof(first->wb_verf.verifier));
+	data->verf.verifier[0]++; /* ensure verifier mismatch */
+}
+
+static int filelayout_commit_done_cb(struct rpc_task *task,
+				     struct nfs_write_data *data)
+{
+	int reset = 0;
+
+	if (filelayout_async_handle_error(task, data->args.context->state,
+					  data->ds_clp, &reset) == -EAGAIN) {
+		dprintk("%s calling restart ds_clp %p ds_clp->cl_session %p\n",
+			__func__, data->ds_clp, data->ds_clp->cl_session);
+		if (reset) {
+			prepare_to_resend_writes(data);
+			filelayout_set_lo_fail(data->lseg);
+		} else
+			nfs_restart_rpc(task, data->ds_clp);
+		return -EAGAIN;
+	}
+
+	return 0;
+}
+
+static void filelayout_write_prepare(struct rpc_task *task, void *data)
+{
+	struct nfs_write_data *wdata = (struct nfs_write_data *)data;
+
+	if (nfs41_setup_sequence(wdata->ds_clp->cl_session,
+				&wdata->args.seq_args, &wdata->res.seq_res,
+				0, task))
+		return;
+
+	rpc_call_start(task);
+}
+
+static void filelayout_write_call_done(struct rpc_task *task, void *data)
+{
+	struct nfs_write_data *wdata = (struct nfs_write_data *)data;
+
+	/* Note this may cause RPC to be resent */
+	wdata->mds_ops->rpc_call_done(task, data);
+}
+
+static void filelayout_write_release(void *data)
+{
+	struct nfs_write_data *wdata = (struct nfs_write_data *)data;
+
+	wdata->mds_ops->rpc_release(data);
+}
+
+static void filelayout_commit_release(void *data)
+{
+	struct nfs_write_data *wdata = (struct nfs_write_data *)data;
+
+	nfs_commit_release_pages(wdata);
+	if (atomic_dec_and_test(&NFS_I(wdata->inode)->commits_outstanding))
+		nfs_commit_clear_lock(NFS_I(wdata->inode));
+	nfs_commitdata_release(wdata);
+}
+
+struct rpc_call_ops filelayout_read_call_ops = {
+	.rpc_call_prepare = filelayout_read_prepare,
+	.rpc_call_done = filelayout_read_call_done,
+	.rpc_release = filelayout_read_release,
+};
+
+struct rpc_call_ops filelayout_write_call_ops = {
+	.rpc_call_prepare = filelayout_write_prepare,
+	.rpc_call_done = filelayout_write_call_done,
+	.rpc_release = filelayout_write_release,
+};
+
+struct rpc_call_ops filelayout_commit_call_ops = {
+	.rpc_call_prepare = filelayout_write_prepare,
+	.rpc_call_done = filelayout_write_call_done,
+	.rpc_release = filelayout_commit_release,
+};
+
+static enum pnfs_try_status
+filelayout_read_pagelist(struct nfs_read_data *data)
+{
+	struct pnfs_layout_segment *lseg = data->lseg;
+	struct nfs4_pnfs_ds *ds;
+	loff_t offset = data->args.offset;
+	u32 j, idx;
+	struct nfs_fh *fh;
+	int status;
+
+	dprintk("--> %s ino %lu pgbase %u req %Zu@%llu\n",
+		__func__, data->inode->i_ino,
+		data->args.pgbase, (size_t)data->args.count, offset);
+
+	/* Retrieve the correct rpc_client for the byte range */
+	j = nfs4_fl_calc_j_index(lseg, offset);
+	idx = nfs4_fl_calc_ds_index(lseg, j);
+	ds = nfs4_fl_prepare_ds(lseg, idx);
+	if (!ds) {
+		/* Either layout fh index faulty, or ds connect failed */
+		set_bit(lo_fail_bit(IOMODE_RW), &lseg->pls_layout->plh_flags);
+		set_bit(lo_fail_bit(IOMODE_READ), &lseg->pls_layout->plh_flags);
+		return PNFS_NOT_ATTEMPTED;
+	}
+	dprintk("%s USE DS:ip %x %hu\n", __func__,
+		ntohl(ds->ds_ip_addr), ntohs(ds->ds_port));
+
+	/* No multipath support. Use first DS */
+	data->ds_clp = ds->ds_clp;
+	fh = nfs4_fl_select_ds_fh(lseg, j);
+	if (fh)
+		data->args.fh = fh;
+
+	data->args.offset = filelayout_get_dserver_offset(lseg, offset);
+	data->mds_offset = offset;
+
+	/* Perform an asynchronous read to ds */
+	status = nfs_initiate_read(data, ds->ds_clp->cl_rpcclient,
+				   &filelayout_read_call_ops);
+	BUG_ON(status != 0);
+	return PNFS_ATTEMPTED;
+}
+
+/* Perform async writes. */
+static enum pnfs_try_status
+filelayout_write_pagelist(struct nfs_write_data *data, int sync)
+{
+	struct pnfs_layout_segment *lseg = data->lseg;
+	struct nfs4_pnfs_ds *ds;
+	loff_t offset = data->args.offset;
+	u32 j, idx;
+	struct nfs_fh *fh;
+	int status;
+
+	/* Retrieve the correct rpc_client for the byte range */
+	j = nfs4_fl_calc_j_index(lseg, offset);
+	idx = nfs4_fl_calc_ds_index(lseg, j);
+	ds = nfs4_fl_prepare_ds(lseg, idx);
+	if (!ds) {
+		printk(KERN_ERR "%s: prepare_ds failed, use MDS\n", __func__);
+		set_bit(lo_fail_bit(IOMODE_RW), &lseg->pls_layout->plh_flags);
+		set_bit(lo_fail_bit(IOMODE_READ), &lseg->pls_layout->plh_flags);
+		return PNFS_NOT_ATTEMPTED;
+	}
+	dprintk("%s ino %lu sync %d req %Zu@%llu DS:%x:%hu\n", __func__,
+		data->inode->i_ino, sync, (size_t) data->args.count, offset,
+		ntohl(ds->ds_ip_addr), ntohs(ds->ds_port));
+
+	data->write_done_cb = filelayout_write_done_cb;
+	data->ds_clp = ds->ds_clp;
+	fh = nfs4_fl_select_ds_fh(lseg, j);
+	if (fh)
+		data->args.fh = fh;
+	/*
+	 * Get the file offset on the dserver. Set the write offset to
+	 * this offset and save the original offset.
+	 */
+	data->args.offset = filelayout_get_dserver_offset(lseg, offset);
+	data->mds_offset = offset;
+
+	/* Perform an asynchronous write */
+	status = nfs_initiate_write(data, ds->ds_clp->cl_rpcclient,
+				    &filelayout_write_call_ops, sync);
+	BUG_ON(status != 0);
+	return PNFS_ATTEMPTED;
+}
+
 /*
  * filelayout_check_layout()
  *
@@ -92,14 +430,14 @@ filelayout_check_layout(struct pnfs_layout_hdr *lo,
 		goto out;
 	}
 
-	if (fl->stripe_unit % PAGE_SIZE) {
-		dprintk("%s Stripe unit (%u) not page aligned\n",
+	if (!fl->stripe_unit || fl->stripe_unit % PAGE_SIZE) {
+		dprintk("%s Invalid stripe unit (%u)\n",
 			__func__, fl->stripe_unit);
 		goto out;
 	}
 
 	/* find and reference the deviceid */
-	dsaddr = nfs4_fl_find_get_deviceid(nfss->nfs_client, id);
+	dsaddr = nfs4_fl_find_get_deviceid(id);
 	if (dsaddr == NULL) {
 		dsaddr = get_device_info(lo->plh_inode, id);
 		if (dsaddr == NULL)
@@ -134,7 +472,7 @@ out:
 	dprintk("--> %s returns %d\n", __func__, status);
 	return status;
 out_put:
-	pnfs_put_deviceid(nfss->nfs_client->cl_devid_cache, &dsaddr->deviceid);
+	nfs4_fl_put_deviceid(dsaddr);
 	goto out;
 }
 
@@ -164,12 +502,33 @@ filelayout_decode_layout(struct pnfs_layout_hdr *flo,
 			 struct nfs4_layoutget_res *lgr,
 			 struct nfs4_deviceid *id)
 {
-	uint32_t *p = (uint32_t *)lgr->layout.buf;
+	struct xdr_stream stream;
+	struct xdr_buf buf = {
+		.pages =  lgr->layoutp->pages,
+		.page_len =  lgr->layoutp->len,
+		.buflen =  lgr->layoutp->len,
+		.len = lgr->layoutp->len,
+	};
+	struct page *scratch;
+	__be32 *p;
 	uint32_t nfl_util;
 	int i;
 
 	dprintk("%s: set_layout_map Begin\n", __func__);
 
+	scratch = alloc_page(GFP_KERNEL);
+	if (!scratch)
+		return -ENOMEM;
+
+	xdr_init_decode(&stream, &buf, NULL);
+	xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
+
+	/* 20 = ufl_util (4), first_stripe_index (4), pattern_offset (8),
+	 * num_fh (4) */
+	p = xdr_inline_decode(&stream, NFS4_DEVICEID4_SIZE + 20);
+	if (unlikely(!p))
+		goto out_err;
+
 	memcpy(id, p, sizeof(*id));
 	p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
 	print_deviceid(id);
@@ -191,32 +550,57 @@ filelayout_decode_layout(struct pnfs_layout_hdr *flo,
 		__func__, nfl_util, fl->num_fh, fl->first_stripe_index,
 		fl->pattern_offset);
 
+	if (!fl->num_fh)
+		goto out_err;
+
 	fl->fh_array = kzalloc(fl->num_fh * sizeof(struct nfs_fh *),
 			       GFP_KERNEL);
 	if (!fl->fh_array)
-		return -ENOMEM;
+		goto out_err;
 
 	for (i = 0; i < fl->num_fh; i++) {
 		/* Do we want to use a mempool here? */
 		fl->fh_array[i] = kmalloc(sizeof(struct nfs_fh), GFP_KERNEL);
-		if (!fl->fh_array[i]) {
-			filelayout_free_fh_array(fl);
-			return -ENOMEM;
-		}
+		if (!fl->fh_array[i])
+			goto out_err_free;
+
+		p = xdr_inline_decode(&stream, 4);
+		if (unlikely(!p))
+			goto out_err_free;
 		fl->fh_array[i]->size = be32_to_cpup(p++);
 		if (sizeof(struct nfs_fh) < fl->fh_array[i]->size) {
 			printk(KERN_ERR "Too big fh %d received %d\n",
 			       i, fl->fh_array[i]->size);
-			filelayout_free_fh_array(fl);
-			return -EIO;
+			goto out_err_free;
 		}
+
+		p = xdr_inline_decode(&stream, fl->fh_array[i]->size);
+		if (unlikely(!p))
+			goto out_err_free;
 		memcpy(fl->fh_array[i]->data, p, fl->fh_array[i]->size);
-		p += XDR_QUADLEN(fl->fh_array[i]->size);
 		dprintk("DEBUG: %s: fh len %d\n", __func__,
 			fl->fh_array[i]->size);
 	}
 
+	__free_page(scratch);
 	return 0;
+
+out_err_free:
+	filelayout_free_fh_array(fl);
+out_err:
+	__free_page(scratch);
+	return -EIO;
+}
+
+static void
+filelayout_free_lseg(struct pnfs_layout_segment *lseg)
+{
+	struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg);
+
+	dprintk("--> %s\n", __func__);
+	nfs4_fl_put_deviceid(fl->dsaddr);
+	kfree(fl->commit_buckets);
+	_filelayout_free_lseg(fl);
 }
 
 static struct pnfs_layout_segment *
@@ -237,29 +621,252 @@ filelayout_alloc_lseg(struct pnfs_layout_hdr *layoutid,
 		_filelayout_free_lseg(fl);
 		return NULL;
 	}
+
+	/* This assumes there is only one IOMODE_RW lseg.  What
+	 * we really want to do is have a layout_hdr level
+	 * dictionary of <multipath_list4, fh> keys, each
+	 * associated with a struct list_head, populated by calls
+	 * to filelayout_write_pagelist().
+	 * */
+	if ((!fl->commit_through_mds) && (lgr->range.iomode == IOMODE_RW)) {
+		int i;
+		int size = (fl->stripe_type == STRIPE_SPARSE) ?
+			fl->dsaddr->ds_num : fl->dsaddr->stripe_count;
+
+		fl->commit_buckets = kcalloc(size, sizeof(struct list_head), GFP_KERNEL);
+		if (!fl->commit_buckets) {
+			filelayout_free_lseg(&fl->generic_hdr);
+			return NULL;
+		}
+		fl->number_of_buckets = size;
+		for (i = 0; i < size; i++)
+			INIT_LIST_HEAD(&fl->commit_buckets[i]);
+	}
 	return &fl->generic_hdr;
 }
 
-static void
-filelayout_free_lseg(struct pnfs_layout_segment *lseg)
+/*
+ * filelayout_pg_test(). Called by nfs_can_coalesce_requests()
+ *
+ * return 1 :  coalesce page
+ * return 0 :  don't coalesce page
+ */
+int
+filelayout_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
+		   struct nfs_page *req)
+{
+	u64 p_stripe, r_stripe;
+	u32 stripe_unit;
+
+	if (!pgio->pg_lseg)
+		return 1;
+	p_stripe = (u64)prev->wb_index << PAGE_CACHE_SHIFT;
+	r_stripe = (u64)req->wb_index << PAGE_CACHE_SHIFT;
+	stripe_unit = FILELAYOUT_LSEG(pgio->pg_lseg)->stripe_unit;
+
+	do_div(p_stripe, stripe_unit);
+	do_div(r_stripe, stripe_unit);
+
+	return (p_stripe == r_stripe);
+}
+
+static bool filelayout_mark_pnfs_commit(struct pnfs_layout_segment *lseg)
+{
+	return !FILELAYOUT_LSEG(lseg)->commit_through_mds;
+}
+
+static u32 select_bucket_index(struct nfs4_filelayout_segment *fl, u32 j)
+{
+	if (fl->stripe_type == STRIPE_SPARSE)
+		return nfs4_fl_calc_ds_index(&fl->generic_hdr, j);
+	else
+		return j;
+}
+
+struct list_head *filelayout_choose_commit_list(struct nfs_page *req)
 {
-	struct nfs_server *nfss = NFS_SERVER(lseg->pls_layout->plh_inode);
+	struct pnfs_layout_segment *lseg = req->wb_commit_lseg;
 	struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg);
+	u32 i, j;
+	struct list_head *list;
+
+	/* Note that we are calling nfs4_fl_calc_j_index on each page
+	 * that ends up being committed to a data server.  An attractive
+	 * alternative is to add a field to nfs_write_data and nfs_page
+	 * to store the value calculated in filelayout_write_pagelist
+	 * and just use that here.
+	 */
+	j = nfs4_fl_calc_j_index(lseg,
+				 (loff_t)req->wb_index << PAGE_CACHE_SHIFT);
+	i = select_bucket_index(fl, j);
+	list = &fl->commit_buckets[i];
+	if (list_empty(list)) {
+		/* Non-empty buckets hold a reference on the lseg */
+		get_lseg(lseg);
+	}
+	return list;
+}
 
-	dprintk("--> %s\n", __func__);
-	pnfs_put_deviceid(nfss->nfs_client->cl_devid_cache,
-			  &fl->dsaddr->deviceid);
-	_filelayout_free_lseg(fl);
+static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i)
+{
+	struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
+
+	if (flseg->stripe_type == STRIPE_SPARSE)
+		return i;
+	else
+		return nfs4_fl_calc_ds_index(lseg, i);
+}
+
+static struct nfs_fh *
+select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i)
+{
+	struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
+
+	if (flseg->stripe_type == STRIPE_SPARSE) {
+		if (flseg->num_fh == 1)
+			i = 0;
+		else if (flseg->num_fh == 0)
+			/* Use the MDS OPEN fh set in nfs_read_rpcsetup */
+			return NULL;
+	}
+	return flseg->fh_array[i];
+}
+
+static int filelayout_initiate_commit(struct nfs_write_data *data, int how)
+{
+	struct pnfs_layout_segment *lseg = data->lseg;
+	struct nfs4_pnfs_ds *ds;
+	u32 idx;
+	struct nfs_fh *fh;
+
+	idx = calc_ds_index_from_commit(lseg, data->ds_commit_index);
+	ds = nfs4_fl_prepare_ds(lseg, idx);
+	if (!ds) {
+		printk(KERN_ERR "%s: prepare_ds failed, use MDS\n", __func__);
+		set_bit(lo_fail_bit(IOMODE_RW), &lseg->pls_layout->plh_flags);
+		set_bit(lo_fail_bit(IOMODE_READ), &lseg->pls_layout->plh_flags);
+		prepare_to_resend_writes(data);
+		data->mds_ops->rpc_release(data);
+		return -EAGAIN;
+	}
+	dprintk("%s ino %lu, how %d\n", __func__, data->inode->i_ino, how);
+	data->write_done_cb = filelayout_commit_done_cb;
+	data->ds_clp = ds->ds_clp;
+	fh = select_ds_fh_from_commit(lseg, data->ds_commit_index);
+	if (fh)
+		data->args.fh = fh;
+	return nfs_initiate_commit(data, ds->ds_clp->cl_rpcclient,
+				   &filelayout_commit_call_ops, how);
+}
+
+/*
+ * This is only useful while we are using whole file layouts.
+ */
+static struct pnfs_layout_segment *find_only_write_lseg(struct inode *inode)
+{
+	struct pnfs_layout_segment *lseg, *rv = NULL;
+
+	spin_lock(&inode->i_lock);
+	list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list)
+		if (lseg->pls_range.iomode == IOMODE_RW)
+			rv = get_lseg(lseg);
+	spin_unlock(&inode->i_lock);
+	return rv;
+}
+
+static int alloc_ds_commits(struct inode *inode, struct list_head *list)
+{
+	struct pnfs_layout_segment *lseg;
+	struct nfs4_filelayout_segment *fl;
+	struct nfs_write_data *data;
+	int i, j;
+
+	/* Won't need this when non-whole file layout segments are supported
+	 * instead we will use a pnfs_layout_hdr structure */
+	lseg = find_only_write_lseg(inode);
+	if (!lseg)
+		return 0;
+	fl = FILELAYOUT_LSEG(lseg);
+	for (i = 0; i < fl->number_of_buckets; i++) {
+		if (list_empty(&fl->commit_buckets[i]))
+			continue;
+		data = nfs_commitdata_alloc();
+		if (!data)
+			goto out_bad;
+		data->ds_commit_index = i;
+		data->lseg = lseg;
+		list_add(&data->pages, list);
+	}
+	put_lseg(lseg);
+	return 0;
+
+out_bad:
+	for (j = i; j < fl->number_of_buckets; j++) {
+		if (list_empty(&fl->commit_buckets[i]))
+			continue;
+		nfs_retry_commit(&fl->commit_buckets[i], lseg);
+		put_lseg(lseg);  /* associated with emptying bucket */
+	}
+	put_lseg(lseg);
+	/* Caller will clean up entries put on list */
+	return -ENOMEM;
+}
+
+/* This follows nfs_commit_list pretty closely */
+static int
+filelayout_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
+			   int how)
+{
+	struct nfs_write_data	*data, *tmp;
+	LIST_HEAD(list);
+
+	if (!list_empty(mds_pages)) {
+		data = nfs_commitdata_alloc();
+		if (!data)
+			goto out_bad;
+		data->lseg = NULL;
+		list_add(&data->pages, &list);
+	}
+
+	if (alloc_ds_commits(inode, &list))
+		goto out_bad;
+
+	list_for_each_entry_safe(data, tmp, &list, pages) {
+		list_del_init(&data->pages);
+		atomic_inc(&NFS_I(inode)->commits_outstanding);
+		if (!data->lseg) {
+			nfs_init_commit(data, mds_pages, NULL);
+			nfs_initiate_commit(data, NFS_CLIENT(inode),
+					    data->mds_ops, how);
+		} else {
+			nfs_init_commit(data, &FILELAYOUT_LSEG(data->lseg)->commit_buckets[data->ds_commit_index], data->lseg);
+			filelayout_initiate_commit(data, how);
+		}
+	}
+	return 0;
+ out_bad:
+	list_for_each_entry_safe(data, tmp, &list, pages) {
+		nfs_retry_commit(&data->pages, data->lseg);
+		list_del_init(&data->pages);
+		nfs_commit_free(data);
+	}
+	nfs_retry_commit(mds_pages, NULL);
+	nfs_commit_clear_lock(NFS_I(inode));
+	return -ENOMEM;
 }
 
 static struct pnfs_layoutdriver_type filelayout_type = {
-	.id = LAYOUT_NFSV4_1_FILES,
-	.name = "LAYOUT_NFSV4_1_FILES",
-	.owner = THIS_MODULE,
-	.set_layoutdriver = filelayout_set_layoutdriver,
-	.clear_layoutdriver = filelayout_clear_layoutdriver,
-	.alloc_lseg              = filelayout_alloc_lseg,
-	.free_lseg               = filelayout_free_lseg,
+	.id			= LAYOUT_NFSV4_1_FILES,
+	.name			= "LAYOUT_NFSV4_1_FILES",
+	.owner			= THIS_MODULE,
+	.alloc_lseg		= filelayout_alloc_lseg,
+	.free_lseg		= filelayout_free_lseg,
+	.pg_test		= filelayout_pg_test,
+	.mark_pnfs_commit	= filelayout_mark_pnfs_commit,
+	.choose_commit_list	= filelayout_choose_commit_list,
+	.commit_pagelist	= filelayout_commit_pagelist,
+	.read_pagelist		= filelayout_read_pagelist,
+	.write_pagelist		= filelayout_write_pagelist,
 };
 
 static int __init nfs4filelayout_init(void)