306 lines
8.4 KiB
C
306 lines
8.4 KiB
C
/*
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* Device operations for the pnfs nfs4 file layout driver.
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*
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* Copyright (c) 2002
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* The Regents of the University of Michigan
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* All Rights Reserved
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*
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* Dean Hildebrand <dhildebz@umich.edu>
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* Garth Goodson <Garth.Goodson@netapp.com>
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*
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* Permission is granted to use, copy, create derivative works, and
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* redistribute this software and such derivative works for any purpose,
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* so long as the name of the University of Michigan is not used in
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* any advertising or publicity pertaining to the use or distribution
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* of this software without specific, written prior authorization. If
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* the above copyright notice or any other identification of the
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* University of Michigan is included in any copy of any portion of
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* this software, then the disclaimer below must also be included.
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*
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* This software is provided as is, without representation or warranty
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* of any kind either express or implied, including without limitation
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* the implied warranties of merchantability, fitness for a particular
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* purpose, or noninfringement. The Regents of the University of
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* Michigan shall not be liable for any damages, including special,
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* indirect, incidental, or consequential damages, with respect to any
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* claim arising out of or in connection with the use of the software,
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* even if it has been or is hereafter advised of the possibility of
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* such damages.
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*/
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#include <linux/nfs_fs.h>
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#include <linux/vmalloc.h>
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#include <linux/module.h>
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#include "../internal.h"
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#include "../nfs4session.h"
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#include "filelayout.h"
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#define NFSDBG_FACILITY NFSDBG_PNFS_LD
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static unsigned int dataserver_timeo = NFS4_DEF_DS_TIMEO;
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static unsigned int dataserver_retrans = NFS4_DEF_DS_RETRANS;
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void
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nfs4_fl_free_deviceid(struct nfs4_file_layout_dsaddr *dsaddr)
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{
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struct nfs4_pnfs_ds *ds;
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int i;
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nfs4_print_deviceid(&dsaddr->id_node.deviceid);
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for (i = 0; i < dsaddr->ds_num; i++) {
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ds = dsaddr->ds_list[i];
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if (ds != NULL)
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nfs4_pnfs_ds_put(ds);
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}
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kfree(dsaddr->stripe_indices);
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kfree_rcu(dsaddr, id_node.rcu);
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}
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/* Decode opaque device data and return the result */
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struct nfs4_file_layout_dsaddr *
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nfs4_fl_alloc_deviceid_node(struct nfs_server *server, struct pnfs_device *pdev,
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gfp_t gfp_flags)
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{
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int i;
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u32 cnt, num;
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u8 *indexp;
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__be32 *p;
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u8 *stripe_indices;
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u8 max_stripe_index;
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struct nfs4_file_layout_dsaddr *dsaddr = NULL;
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struct xdr_stream stream;
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struct xdr_buf buf;
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struct page *scratch;
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struct list_head dsaddrs;
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struct nfs4_pnfs_ds_addr *da;
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/* set up xdr stream */
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scratch = alloc_page(gfp_flags);
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if (!scratch)
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goto out_err;
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xdr_init_decode_pages(&stream, &buf, pdev->pages, pdev->pglen);
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xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
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/* Get the stripe count (number of stripe index) */
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p = xdr_inline_decode(&stream, 4);
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if (unlikely(!p))
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goto out_err_free_scratch;
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cnt = be32_to_cpup(p);
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dprintk("%s stripe count %d\n", __func__, cnt);
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if (cnt > NFS4_PNFS_MAX_STRIPE_CNT) {
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printk(KERN_WARNING "NFS: %s: stripe count %d greater than "
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"supported maximum %d\n", __func__,
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cnt, NFS4_PNFS_MAX_STRIPE_CNT);
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goto out_err_free_scratch;
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}
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/* read stripe indices */
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stripe_indices = kcalloc(cnt, sizeof(u8), gfp_flags);
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if (!stripe_indices)
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goto out_err_free_scratch;
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p = xdr_inline_decode(&stream, cnt << 2);
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if (unlikely(!p))
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goto out_err_free_stripe_indices;
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indexp = &stripe_indices[0];
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max_stripe_index = 0;
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for (i = 0; i < cnt; i++) {
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*indexp = be32_to_cpup(p++);
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max_stripe_index = max(max_stripe_index, *indexp);
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indexp++;
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}
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/* Check the multipath list count */
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p = xdr_inline_decode(&stream, 4);
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if (unlikely(!p))
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goto out_err_free_stripe_indices;
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num = be32_to_cpup(p);
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dprintk("%s ds_num %u\n", __func__, num);
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if (num > NFS4_PNFS_MAX_MULTI_CNT) {
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printk(KERN_WARNING "NFS: %s: multipath count %d greater than "
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"supported maximum %d\n", __func__,
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num, NFS4_PNFS_MAX_MULTI_CNT);
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goto out_err_free_stripe_indices;
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}
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/* validate stripe indices are all < num */
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if (max_stripe_index >= num) {
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printk(KERN_WARNING "NFS: %s: stripe index %u >= num ds %u\n",
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__func__, max_stripe_index, num);
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goto out_err_free_stripe_indices;
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}
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dsaddr = kzalloc(sizeof(*dsaddr) +
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(sizeof(struct nfs4_pnfs_ds *) * (num - 1)),
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gfp_flags);
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if (!dsaddr)
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goto out_err_free_stripe_indices;
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dsaddr->stripe_count = cnt;
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dsaddr->stripe_indices = stripe_indices;
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stripe_indices = NULL;
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dsaddr->ds_num = num;
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nfs4_init_deviceid_node(&dsaddr->id_node, server, &pdev->dev_id);
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INIT_LIST_HEAD(&dsaddrs);
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for (i = 0; i < dsaddr->ds_num; i++) {
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int j;
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u32 mp_count;
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p = xdr_inline_decode(&stream, 4);
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if (unlikely(!p))
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goto out_err_free_deviceid;
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mp_count = be32_to_cpup(p); /* multipath count */
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for (j = 0; j < mp_count; j++) {
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da = nfs4_decode_mp_ds_addr(server->nfs_client->cl_net,
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&stream, gfp_flags);
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if (da)
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list_add_tail(&da->da_node, &dsaddrs);
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}
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if (list_empty(&dsaddrs)) {
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dprintk("%s: no suitable DS addresses found\n",
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__func__);
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goto out_err_free_deviceid;
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}
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dsaddr->ds_list[i] = nfs4_pnfs_ds_add(&dsaddrs, gfp_flags);
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if (!dsaddr->ds_list[i])
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goto out_err_drain_dsaddrs;
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/* If DS was already in cache, free ds addrs */
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while (!list_empty(&dsaddrs)) {
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da = list_first_entry(&dsaddrs,
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struct nfs4_pnfs_ds_addr,
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da_node);
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list_del_init(&da->da_node);
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kfree(da->da_remotestr);
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kfree(da);
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}
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}
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__free_page(scratch);
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return dsaddr;
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out_err_drain_dsaddrs:
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while (!list_empty(&dsaddrs)) {
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da = list_first_entry(&dsaddrs, struct nfs4_pnfs_ds_addr,
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da_node);
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list_del_init(&da->da_node);
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kfree(da->da_remotestr);
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kfree(da);
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}
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out_err_free_deviceid:
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nfs4_fl_free_deviceid(dsaddr);
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/* stripe_indicies was part of dsaddr */
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goto out_err_free_scratch;
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out_err_free_stripe_indices:
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kfree(stripe_indices);
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out_err_free_scratch:
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__free_page(scratch);
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out_err:
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dprintk("%s ERROR: returning NULL\n", __func__);
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return NULL;
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}
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void
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nfs4_fl_put_deviceid(struct nfs4_file_layout_dsaddr *dsaddr)
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{
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nfs4_put_deviceid_node(&dsaddr->id_node);
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}
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/*
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* Want res = (offset - layout->pattern_offset)/ layout->stripe_unit
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* Then: ((res + fsi) % dsaddr->stripe_count)
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*/
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u32
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nfs4_fl_calc_j_index(struct pnfs_layout_segment *lseg, loff_t offset)
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{
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struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
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u64 tmp;
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tmp = offset - flseg->pattern_offset;
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do_div(tmp, flseg->stripe_unit);
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tmp += flseg->first_stripe_index;
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return do_div(tmp, flseg->dsaddr->stripe_count);
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}
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u32
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nfs4_fl_calc_ds_index(struct pnfs_layout_segment *lseg, u32 j)
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{
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return FILELAYOUT_LSEG(lseg)->dsaddr->stripe_indices[j];
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}
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struct nfs_fh *
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nfs4_fl_select_ds_fh(struct pnfs_layout_segment *lseg, u32 j)
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{
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struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
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u32 i;
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if (flseg->stripe_type == STRIPE_SPARSE) {
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if (flseg->num_fh == 1)
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i = 0;
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else if (flseg->num_fh == 0)
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/* Use the MDS OPEN fh set in nfs_read_rpcsetup */
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return NULL;
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else
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i = nfs4_fl_calc_ds_index(lseg, j);
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} else
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i = j;
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return flseg->fh_array[i];
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}
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/* Upon return, either ds is connected, or ds is NULL */
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struct nfs4_pnfs_ds *
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nfs4_fl_prepare_ds(struct pnfs_layout_segment *lseg, u32 ds_idx)
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{
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struct nfs4_file_layout_dsaddr *dsaddr = FILELAYOUT_LSEG(lseg)->dsaddr;
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struct nfs4_pnfs_ds *ds = dsaddr->ds_list[ds_idx];
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struct nfs4_deviceid_node *devid = FILELAYOUT_DEVID_NODE(lseg);
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struct nfs4_pnfs_ds *ret = ds;
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struct nfs_server *s = NFS_SERVER(lseg->pls_layout->plh_inode);
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int status;
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if (ds == NULL) {
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printk(KERN_ERR "NFS: %s: No data server for offset index %d\n",
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__func__, ds_idx);
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pnfs_generic_mark_devid_invalid(devid);
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goto out;
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}
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smp_rmb();
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if (ds->ds_clp)
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goto out_test_devid;
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status = nfs4_pnfs_ds_connect(s, ds, devid, dataserver_timeo,
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dataserver_retrans, 4,
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s->nfs_client->cl_minorversion);
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if (status) {
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nfs4_mark_deviceid_unavailable(devid);
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ret = NULL;
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goto out;
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}
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out_test_devid:
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if (ret->ds_clp == NULL ||
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filelayout_test_devid_unavailable(devid))
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ret = NULL;
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out:
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return ret;
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}
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module_param(dataserver_retrans, uint, 0644);
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MODULE_PARM_DESC(dataserver_retrans, "The number of times the NFSv4.1 client "
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"retries a request before it attempts further "
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" recovery action.");
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module_param(dataserver_timeo, uint, 0644);
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MODULE_PARM_DESC(dataserver_timeo, "The time (in tenths of a second) the "
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"NFSv4.1 client waits for a response from a "
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" data server before it retries an NFS request.");
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