--- /dev/null
+/*
+ * Device operations for the pnfs nfs4 file layout driver.
+ *
+ * Copyright (c) 2002
+ * The Regents of the University of Michigan
+ * All Rights Reserved
+ *
+ * Dean Hildebrand <dhildebz@umich.edu>
+ * Garth Goodson <Garth.Goodson@netapp.com>
+ *
+ * Permission is granted to use, copy, create derivative works, and
+ * redistribute this software and such derivative works for any purpose,
+ * so long as the name of the University of Michigan is not used in
+ * any advertising or publicity pertaining to the use or distribution
+ * of this software without specific, written prior authorization. If
+ * the above copyright notice or any other identification of the
+ * University of Michigan is included in any copy of any portion of
+ * this software, then the disclaimer below must also be included.
+ *
+ * This software is provided as is, without representation or warranty
+ * of any kind either express or implied, including without limitation
+ * the implied warranties of merchantability, fitness for a particular
+ * purpose, or noninfringement. The Regents of the University of
+ * Michigan shall not be liable for any damages, including special,
+ * indirect, incidental, or consequential damages, with respect to any
+ * claim arising out of or in connection with the use of the software,
+ * even if it has been or is hereafter advised of the possibility of
+ * such damages.
+ */
+
+#include <linux/nfs_fs.h>
+#include <linux/vmalloc.h>
+#include <linux/module.h>
+
+#include "../internal.h"
+#include "../nfs4session.h"
+#include "filelayout.h"
+
+#define NFSDBG_FACILITY NFSDBG_PNFS_LD
+
+static unsigned int dataserver_timeo = NFS4_DEF_DS_TIMEO;
+static unsigned int dataserver_retrans = NFS4_DEF_DS_RETRANS;
+
+void
+nfs4_fl_free_deviceid(struct nfs4_file_layout_dsaddr *dsaddr)
+{
+ struct nfs4_pnfs_ds *ds;
+ int i;
+
+ nfs4_print_deviceid(&dsaddr->id_node.deviceid);
+
+ for (i = 0; i < dsaddr->ds_num; i++) {
+ ds = dsaddr->ds_list[i];
+ if (ds != NULL)
+ nfs4_pnfs_ds_put(ds);
+ }
+ kfree(dsaddr->stripe_indices);
+ kfree_rcu(dsaddr, id_node.rcu);
+}
+
+/* Decode opaque device data and return the result */
+struct nfs4_file_layout_dsaddr *
+nfs4_fl_alloc_deviceid_node(struct nfs_server *server, struct pnfs_device *pdev,
+ gfp_t gfp_flags)
+{
+ int i;
+ u32 cnt, num;
+ u8 *indexp;
+ __be32 *p;
+ u8 *stripe_indices;
+ u8 max_stripe_index;
+ struct nfs4_file_layout_dsaddr *dsaddr = NULL;
+ struct xdr_stream stream;
+ struct xdr_buf buf;
+ struct page *scratch;
+ struct list_head dsaddrs;
+ struct nfs4_pnfs_ds_addr *da;
+
+ /* set up xdr stream */
+ scratch = alloc_page(gfp_flags);
+ if (!scratch)
+ goto out_err;
+
+ xdr_init_decode_pages(&stream, &buf, pdev->pages, pdev->pglen);
+ xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
+
+ /* Get the stripe count (number of stripe index) */
+ p = xdr_inline_decode(&stream, 4);
+ if (unlikely(!p))
+ goto out_err_free_scratch;
+
+ cnt = be32_to_cpup(p);
+ dprintk("%s stripe count %d\n", __func__, cnt);
+ if (cnt > NFS4_PNFS_MAX_STRIPE_CNT) {
+ printk(KERN_WARNING "NFS: %s: stripe count %d greater than "
+ "supported maximum %d\n", __func__,
+ cnt, NFS4_PNFS_MAX_STRIPE_CNT);
+ goto out_err_free_scratch;
+ }
+
+ /* read stripe indices */
+ stripe_indices = kcalloc(cnt, sizeof(u8), gfp_flags);
+ if (!stripe_indices)
+ goto out_err_free_scratch;
+
+ p = xdr_inline_decode(&stream, cnt << 2);
+ if (unlikely(!p))
+ goto out_err_free_stripe_indices;
+
+ indexp = &stripe_indices[0];
+ max_stripe_index = 0;
+ for (i = 0; i < cnt; i++) {
+ *indexp = be32_to_cpup(p++);
+ max_stripe_index = max(max_stripe_index, *indexp);
+ indexp++;
+ }
+
+ /* Check the multipath list count */
+ p = xdr_inline_decode(&stream, 4);
+ if (unlikely(!p))
+ goto out_err_free_stripe_indices;
+
+ num = be32_to_cpup(p);
+ dprintk("%s ds_num %u\n", __func__, num);
+ if (num > NFS4_PNFS_MAX_MULTI_CNT) {
+ printk(KERN_WARNING "NFS: %s: multipath count %d greater than "
+ "supported maximum %d\n", __func__,
+ num, NFS4_PNFS_MAX_MULTI_CNT);
+ goto out_err_free_stripe_indices;
+ }
+
+ /* validate stripe indices are all < num */
+ if (max_stripe_index >= num) {
+ printk(KERN_WARNING "NFS: %s: stripe index %u >= num ds %u\n",
+ __func__, max_stripe_index, num);
+ goto out_err_free_stripe_indices;
+ }
+
+ dsaddr = kzalloc(sizeof(*dsaddr) +
+ (sizeof(struct nfs4_pnfs_ds *) * (num - 1)),
+ gfp_flags);
+ if (!dsaddr)
+ goto out_err_free_stripe_indices;
+
+ dsaddr->stripe_count = cnt;
+ dsaddr->stripe_indices = stripe_indices;
+ stripe_indices = NULL;
+ dsaddr->ds_num = num;
+ nfs4_init_deviceid_node(&dsaddr->id_node, server, &pdev->dev_id);
+
+ INIT_LIST_HEAD(&dsaddrs);
+
+ for (i = 0; i < dsaddr->ds_num; i++) {
+ int j;
+ u32 mp_count;
+
+ p = xdr_inline_decode(&stream, 4);
+ if (unlikely(!p))
+ goto out_err_free_deviceid;
+
+ mp_count = be32_to_cpup(p); /* multipath count */
+ for (j = 0; j < mp_count; j++) {
+ da = nfs4_decode_mp_ds_addr(server->nfs_client->cl_net,
+ &stream, gfp_flags);
+ if (da)
+ list_add_tail(&da->da_node, &dsaddrs);
+ }
+ if (list_empty(&dsaddrs)) {
+ dprintk("%s: no suitable DS addresses found\n",
+ __func__);
+ goto out_err_free_deviceid;
+ }
+
+ dsaddr->ds_list[i] = nfs4_pnfs_ds_add(&dsaddrs, gfp_flags);
+ if (!dsaddr->ds_list[i])
+ goto out_err_drain_dsaddrs;
+
+ /* If DS was already in cache, free ds addrs */
+ while (!list_empty(&dsaddrs)) {
+ da = list_first_entry(&dsaddrs,
+ struct nfs4_pnfs_ds_addr,
+ da_node);
+ list_del_init(&da->da_node);
+ kfree(da->da_remotestr);
+ kfree(da);
+ }
+ }
+
+ __free_page(scratch);
+ return dsaddr;
+
+out_err_drain_dsaddrs:
+ while (!list_empty(&dsaddrs)) {
+ da = list_first_entry(&dsaddrs, struct nfs4_pnfs_ds_addr,
+ da_node);
+ list_del_init(&da->da_node);
+ kfree(da->da_remotestr);
+ kfree(da);
+ }
+out_err_free_deviceid:
+ nfs4_fl_free_deviceid(dsaddr);
+ /* stripe_indicies was part of dsaddr */
+ goto out_err_free_scratch;
+out_err_free_stripe_indices:
+ kfree(stripe_indices);
+out_err_free_scratch:
+ __free_page(scratch);
+out_err:
+ dprintk("%s ERROR: returning NULL\n", __func__);
+ return NULL;
+}
+
+void
+nfs4_fl_put_deviceid(struct nfs4_file_layout_dsaddr *dsaddr)
+{
+ nfs4_put_deviceid_node(&dsaddr->id_node);
+}
+
+/*
+ * Want res = (offset - layout->pattern_offset)/ layout->stripe_unit
+ * Then: ((res + fsi) % dsaddr->stripe_count)
+ */
+u32
+nfs4_fl_calc_j_index(struct pnfs_layout_segment *lseg, loff_t offset)
+{
+ struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
+ u64 tmp;
+
+ tmp = offset - flseg->pattern_offset;
+ do_div(tmp, flseg->stripe_unit);
+ tmp += flseg->first_stripe_index;
+ return do_div(tmp, flseg->dsaddr->stripe_count);
+}
+
+u32
+nfs4_fl_calc_ds_index(struct pnfs_layout_segment *lseg, u32 j)
+{
+ return FILELAYOUT_LSEG(lseg)->dsaddr->stripe_indices[j];
+}
+
+struct nfs_fh *
+nfs4_fl_select_ds_fh(struct pnfs_layout_segment *lseg, u32 j)
+{
+ struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
+ u32 i;
+
+ 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;
+ else
+ i = nfs4_fl_calc_ds_index(lseg, j);
+ } else
+ i = j;
+ return flseg->fh_array[i];
+}
+
+/* Upon return, either ds is connected, or ds is NULL */
+struct nfs4_pnfs_ds *
+nfs4_fl_prepare_ds(struct pnfs_layout_segment *lseg, u32 ds_idx)
+{
+ struct nfs4_file_layout_dsaddr *dsaddr = FILELAYOUT_LSEG(lseg)->dsaddr;
+ struct nfs4_pnfs_ds *ds = dsaddr->ds_list[ds_idx];
+ struct nfs4_deviceid_node *devid = FILELAYOUT_DEVID_NODE(lseg);
+ struct nfs4_pnfs_ds *ret = ds;
+ struct nfs_server *s = NFS_SERVER(lseg->pls_layout->plh_inode);
+
+ if (ds == NULL) {
+ printk(KERN_ERR "NFS: %s: No data server for offset index %d\n",
+ __func__, ds_idx);
+ pnfs_generic_mark_devid_invalid(devid);
+ goto out;
+ }
+ smp_rmb();
+ if (ds->ds_clp)
+ goto out_test_devid;
+
+ nfs4_pnfs_ds_connect(s, ds, devid, dataserver_timeo,
+ dataserver_retrans, 4,
+ s->nfs_client->cl_minorversion,
+ s->nfs_client->cl_rpcclient->cl_auth->au_flavor);
+
+out_test_devid:
+ if (filelayout_test_devid_unavailable(devid))
+ ret = NULL;
+out:
+ return ret;
+}
+
+module_param(dataserver_retrans, uint, 0644);
+MODULE_PARM_DESC(dataserver_retrans, "The number of times the NFSv4.1 client "
+ "retries a request before it attempts further "
+ " recovery action.");
+module_param(dataserver_timeo, uint, 0644);
+MODULE_PARM_DESC(dataserver_timeo, "The time (in tenths of a second) the "
+ "NFSv4.1 client waits for a response from a "
+ " data server before it retries an NFS request.");
Code Review / kvmfornfv.git / blobdiff