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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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acd65e5bc1
We need to ensure that the initialisation of the data server nfs_client structure in nfs4_ds_connect is correctly ordered w.r.t. the read of ds->ds_clp in nfs4_fl_prepare_ds. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
844 lines
21 KiB
C
844 lines
21 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 <linux/sunrpc/addr.h>
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#include "internal.h"
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#include "nfs4session.h"
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#include "nfs4filelayout.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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/*
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* Data server cache
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*
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* Data servers can be mapped to different device ids.
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* nfs4_pnfs_ds reference counting
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* - set to 1 on allocation
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* - incremented when a device id maps a data server already in the cache.
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* - decremented when deviceid is removed from the cache.
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*/
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static DEFINE_SPINLOCK(nfs4_ds_cache_lock);
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static LIST_HEAD(nfs4_data_server_cache);
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/* Debug routines */
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void
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print_ds(struct nfs4_pnfs_ds *ds)
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{
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if (ds == NULL) {
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printk("%s NULL device\n", __func__);
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return;
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}
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printk(" ds %s\n"
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" ref count %d\n"
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" client %p\n"
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" cl_exchange_flags %x\n",
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ds->ds_remotestr,
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atomic_read(&ds->ds_count), ds->ds_clp,
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ds->ds_clp ? ds->ds_clp->cl_exchange_flags : 0);
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}
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static bool
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same_sockaddr(struct sockaddr *addr1, struct sockaddr *addr2)
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{
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struct sockaddr_in *a, *b;
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struct sockaddr_in6 *a6, *b6;
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if (addr1->sa_family != addr2->sa_family)
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return false;
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switch (addr1->sa_family) {
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case AF_INET:
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a = (struct sockaddr_in *)addr1;
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b = (struct sockaddr_in *)addr2;
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if (a->sin_addr.s_addr == b->sin_addr.s_addr &&
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a->sin_port == b->sin_port)
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return true;
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break;
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case AF_INET6:
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a6 = (struct sockaddr_in6 *)addr1;
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b6 = (struct sockaddr_in6 *)addr2;
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/* LINKLOCAL addresses must have matching scope_id */
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if (ipv6_addr_scope(&a6->sin6_addr) ==
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IPV6_ADDR_SCOPE_LINKLOCAL &&
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a6->sin6_scope_id != b6->sin6_scope_id)
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return false;
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if (ipv6_addr_equal(&a6->sin6_addr, &b6->sin6_addr) &&
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a6->sin6_port == b6->sin6_port)
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return true;
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break;
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default:
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dprintk("%s: unhandled address family: %u\n",
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__func__, addr1->sa_family);
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return false;
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}
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return false;
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}
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static bool
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_same_data_server_addrs_locked(const struct list_head *dsaddrs1,
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const struct list_head *dsaddrs2)
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{
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struct nfs4_pnfs_ds_addr *da1, *da2;
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/* step through both lists, comparing as we go */
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for (da1 = list_first_entry(dsaddrs1, typeof(*da1), da_node),
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da2 = list_first_entry(dsaddrs2, typeof(*da2), da_node);
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da1 != NULL && da2 != NULL;
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da1 = list_entry(da1->da_node.next, typeof(*da1), da_node),
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da2 = list_entry(da2->da_node.next, typeof(*da2), da_node)) {
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if (!same_sockaddr((struct sockaddr *)&da1->da_addr,
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(struct sockaddr *)&da2->da_addr))
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return false;
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}
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if (da1 == NULL && da2 == NULL)
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return true;
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return false;
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}
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/*
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* Lookup DS by addresses. nfs4_ds_cache_lock is held
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*/
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static struct nfs4_pnfs_ds *
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_data_server_lookup_locked(const struct list_head *dsaddrs)
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{
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struct nfs4_pnfs_ds *ds;
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list_for_each_entry(ds, &nfs4_data_server_cache, ds_node)
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if (_same_data_server_addrs_locked(&ds->ds_addrs, dsaddrs))
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return ds;
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return NULL;
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}
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/*
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* Create an rpc connection to the nfs4_pnfs_ds data server
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* Currently only supports IPv4 and IPv6 addresses
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*/
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static int
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nfs4_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds)
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{
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struct nfs_client *clp = ERR_PTR(-EIO);
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struct nfs4_pnfs_ds_addr *da;
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int status = 0;
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dprintk("--> %s DS %s au_flavor %d\n", __func__, ds->ds_remotestr,
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mds_srv->nfs_client->cl_rpcclient->cl_auth->au_flavor);
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list_for_each_entry(da, &ds->ds_addrs, da_node) {
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dprintk("%s: DS %s: trying address %s\n",
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__func__, ds->ds_remotestr, da->da_remotestr);
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clp = nfs4_set_ds_client(mds_srv->nfs_client,
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(struct sockaddr *)&da->da_addr,
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da->da_addrlen, IPPROTO_TCP,
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dataserver_timeo, dataserver_retrans);
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if (!IS_ERR(clp))
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break;
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}
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if (IS_ERR(clp)) {
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status = PTR_ERR(clp);
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goto out;
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}
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status = nfs4_init_ds_session(clp, mds_srv->nfs_client->cl_lease_time);
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if (status)
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goto out_put;
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smp_wmb();
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ds->ds_clp = clp;
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dprintk("%s [new] addr: %s\n", __func__, ds->ds_remotestr);
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out:
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return status;
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out_put:
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nfs_put_client(clp);
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goto out;
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}
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static void
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destroy_ds(struct nfs4_pnfs_ds *ds)
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{
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struct nfs4_pnfs_ds_addr *da;
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dprintk("--> %s\n", __func__);
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ifdebug(FACILITY)
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print_ds(ds);
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if (ds->ds_clp)
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nfs_put_client(ds->ds_clp);
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while (!list_empty(&ds->ds_addrs)) {
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da = list_first_entry(&ds->ds_addrs,
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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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kfree(ds->ds_remotestr);
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kfree(ds);
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}
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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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if (atomic_dec_and_lock(&ds->ds_count,
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&nfs4_ds_cache_lock)) {
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list_del_init(&ds->ds_node);
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spin_unlock(&nfs4_ds_cache_lock);
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destroy_ds(ds);
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}
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}
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}
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kfree(dsaddr->stripe_indices);
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kfree(dsaddr);
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}
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/*
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* Create a string with a human readable address and port to avoid
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* complicated setup around many dprinks.
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*/
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static char *
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nfs4_pnfs_remotestr(struct list_head *dsaddrs, gfp_t gfp_flags)
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{
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struct nfs4_pnfs_ds_addr *da;
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char *remotestr;
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size_t len;
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char *p;
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len = 3; /* '{', '}' and eol */
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list_for_each_entry(da, dsaddrs, da_node) {
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len += strlen(da->da_remotestr) + 1; /* string plus comma */
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}
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remotestr = kzalloc(len, gfp_flags);
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if (!remotestr)
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return NULL;
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p = remotestr;
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*(p++) = '{';
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len--;
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list_for_each_entry(da, dsaddrs, da_node) {
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size_t ll = strlen(da->da_remotestr);
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if (ll > len)
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goto out_err;
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memcpy(p, da->da_remotestr, ll);
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p += ll;
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len -= ll;
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if (len < 1)
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goto out_err;
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(*p++) = ',';
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len--;
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}
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if (len < 2)
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goto out_err;
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*(p++) = '}';
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*p = '\0';
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return remotestr;
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out_err:
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kfree(remotestr);
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return NULL;
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}
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static struct nfs4_pnfs_ds *
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nfs4_pnfs_ds_add(struct list_head *dsaddrs, gfp_t gfp_flags)
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{
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struct nfs4_pnfs_ds *tmp_ds, *ds = NULL;
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char *remotestr;
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if (list_empty(dsaddrs)) {
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dprintk("%s: no addresses defined\n", __func__);
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goto out;
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}
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ds = kzalloc(sizeof(*ds), gfp_flags);
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if (!ds)
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goto out;
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/* this is only used for debugging, so it's ok if its NULL */
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remotestr = nfs4_pnfs_remotestr(dsaddrs, gfp_flags);
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spin_lock(&nfs4_ds_cache_lock);
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tmp_ds = _data_server_lookup_locked(dsaddrs);
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if (tmp_ds == NULL) {
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INIT_LIST_HEAD(&ds->ds_addrs);
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list_splice_init(dsaddrs, &ds->ds_addrs);
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ds->ds_remotestr = remotestr;
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atomic_set(&ds->ds_count, 1);
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INIT_LIST_HEAD(&ds->ds_node);
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ds->ds_clp = NULL;
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list_add(&ds->ds_node, &nfs4_data_server_cache);
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dprintk("%s add new data server %s\n", __func__,
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ds->ds_remotestr);
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} else {
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kfree(remotestr);
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kfree(ds);
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atomic_inc(&tmp_ds->ds_count);
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dprintk("%s data server %s found, inc'ed ds_count to %d\n",
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__func__, tmp_ds->ds_remotestr,
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atomic_read(&tmp_ds->ds_count));
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ds = tmp_ds;
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}
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spin_unlock(&nfs4_ds_cache_lock);
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out:
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return ds;
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}
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/*
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* Currently only supports ipv4, ipv6 and one multi-path address.
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*/
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static struct nfs4_pnfs_ds_addr *
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decode_ds_addr(struct net *net, struct xdr_stream *streamp, gfp_t gfp_flags)
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{
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struct nfs4_pnfs_ds_addr *da = NULL;
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char *buf, *portstr;
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__be16 port;
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int nlen, rlen;
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int tmp[2];
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__be32 *p;
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char *netid, *match_netid;
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size_t len, match_netid_len;
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char *startsep = "";
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char *endsep = "";
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/* r_netid */
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p = xdr_inline_decode(streamp, 4);
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if (unlikely(!p))
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goto out_err;
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nlen = be32_to_cpup(p++);
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p = xdr_inline_decode(streamp, nlen);
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if (unlikely(!p))
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goto out_err;
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netid = kmalloc(nlen+1, gfp_flags);
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if (unlikely(!netid))
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goto out_err;
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netid[nlen] = '\0';
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memcpy(netid, p, nlen);
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/* r_addr: ip/ip6addr with port in dec octets - see RFC 5665 */
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p = xdr_inline_decode(streamp, 4);
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if (unlikely(!p))
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goto out_free_netid;
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rlen = be32_to_cpup(p);
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p = xdr_inline_decode(streamp, rlen);
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if (unlikely(!p))
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goto out_free_netid;
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/* port is ".ABC.DEF", 8 chars max */
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if (rlen > INET6_ADDRSTRLEN + IPV6_SCOPE_ID_LEN + 8) {
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dprintk("%s: Invalid address, length %d\n", __func__,
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rlen);
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goto out_free_netid;
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}
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buf = kmalloc(rlen + 1, gfp_flags);
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if (!buf) {
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dprintk("%s: Not enough memory\n", __func__);
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goto out_free_netid;
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}
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buf[rlen] = '\0';
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memcpy(buf, p, rlen);
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|
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/* replace port '.' with '-' */
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portstr = strrchr(buf, '.');
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if (!portstr) {
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dprintk("%s: Failed finding expected dot in port\n",
|
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__func__);
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goto out_free_buf;
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}
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*portstr = '-';
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|
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/* find '.' between address and port */
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portstr = strrchr(buf, '.');
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if (!portstr) {
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dprintk("%s: Failed finding expected dot between address and "
|
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"port\n", __func__);
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goto out_free_buf;
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}
|
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*portstr = '\0';
|
|
|
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da = kzalloc(sizeof(*da), gfp_flags);
|
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if (unlikely(!da))
|
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goto out_free_buf;
|
|
|
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INIT_LIST_HEAD(&da->da_node);
|
|
|
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if (!rpc_pton(net, buf, portstr-buf, (struct sockaddr *)&da->da_addr,
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sizeof(da->da_addr))) {
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dprintk("%s: error parsing address %s\n", __func__, buf);
|
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goto out_free_da;
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}
|
|
|
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portstr++;
|
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sscanf(portstr, "%d-%d", &tmp[0], &tmp[1]);
|
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port = htons((tmp[0] << 8) | (tmp[1]));
|
|
|
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switch (da->da_addr.ss_family) {
|
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case AF_INET:
|
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((struct sockaddr_in *)&da->da_addr)->sin_port = port;
|
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da->da_addrlen = sizeof(struct sockaddr_in);
|
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match_netid = "tcp";
|
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match_netid_len = 3;
|
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break;
|
|
|
|
case AF_INET6:
|
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((struct sockaddr_in6 *)&da->da_addr)->sin6_port = port;
|
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da->da_addrlen = sizeof(struct sockaddr_in6);
|
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match_netid = "tcp6";
|
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match_netid_len = 4;
|
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startsep = "[";
|
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endsep = "]";
|
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break;
|
|
|
|
default:
|
|
dprintk("%s: unsupported address family: %u\n",
|
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__func__, da->da_addr.ss_family);
|
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goto out_free_da;
|
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}
|
|
|
|
if (nlen != match_netid_len || strncmp(netid, match_netid, nlen)) {
|
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dprintk("%s: ERROR: r_netid \"%s\" != \"%s\"\n",
|
|
__func__, netid, match_netid);
|
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goto out_free_da;
|
|
}
|
|
|
|
/* save human readable address */
|
|
len = strlen(startsep) + strlen(buf) + strlen(endsep) + 7;
|
|
da->da_remotestr = kzalloc(len, gfp_flags);
|
|
|
|
/* NULL is ok, only used for dprintk */
|
|
if (da->da_remotestr)
|
|
snprintf(da->da_remotestr, len, "%s%s%s:%u", startsep,
|
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buf, endsep, ntohs(port));
|
|
|
|
dprintk("%s: Parsed DS addr %s\n", __func__, da->da_remotestr);
|
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kfree(buf);
|
|
kfree(netid);
|
|
return da;
|
|
|
|
out_free_da:
|
|
kfree(da);
|
|
out_free_buf:
|
|
dprintk("%s: Error parsing DS addr: %s\n", __func__, buf);
|
|
kfree(buf);
|
|
out_free_netid:
|
|
kfree(netid);
|
|
out_err:
|
|
return NULL;
|
|
}
|
|
|
|
/* Decode opaque device data and return the result */
|
|
static struct nfs4_file_layout_dsaddr*
|
|
decode_device(struct inode *ino, 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,
|
|
NFS_SERVER(ino)->pnfs_curr_ld,
|
|
NFS_SERVER(ino)->nfs_client,
|
|
&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 = decode_ds_addr(NFS_SERVER(ino)->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;
|
|
}
|
|
|
|
/*
|
|
* Decode the opaque device specified in 'dev' and add it to the cache of
|
|
* available devices.
|
|
*/
|
|
static struct nfs4_file_layout_dsaddr *
|
|
decode_and_add_device(struct inode *inode, struct pnfs_device *dev, gfp_t gfp_flags)
|
|
{
|
|
struct nfs4_deviceid_node *d;
|
|
struct nfs4_file_layout_dsaddr *n, *new;
|
|
|
|
new = decode_device(inode, dev, gfp_flags);
|
|
if (!new) {
|
|
printk(KERN_WARNING "NFS: %s: Could not decode or add device\n",
|
|
__func__);
|
|
return NULL;
|
|
}
|
|
|
|
d = nfs4_insert_deviceid_node(&new->id_node);
|
|
n = container_of(d, struct nfs4_file_layout_dsaddr, id_node);
|
|
if (n != new) {
|
|
nfs4_fl_free_deviceid(new);
|
|
return n;
|
|
}
|
|
|
|
return new;
|
|
}
|
|
|
|
/*
|
|
* Retrieve the information for dev_id, add it to the list
|
|
* of available devices, and return it.
|
|
*/
|
|
struct nfs4_file_layout_dsaddr *
|
|
filelayout_get_device_info(struct inode *inode,
|
|
struct nfs4_deviceid *dev_id,
|
|
struct rpc_cred *cred,
|
|
gfp_t gfp_flags)
|
|
{
|
|
struct pnfs_device *pdev = NULL;
|
|
u32 max_resp_sz;
|
|
int max_pages;
|
|
struct page **pages = NULL;
|
|
struct nfs4_file_layout_dsaddr *dsaddr = NULL;
|
|
int rc, i;
|
|
struct nfs_server *server = NFS_SERVER(inode);
|
|
|
|
/*
|
|
* Use the session max response size as the basis for setting
|
|
* GETDEVICEINFO's maxcount
|
|
*/
|
|
max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
|
|
max_pages = nfs_page_array_len(0, max_resp_sz);
|
|
dprintk("%s inode %p max_resp_sz %u max_pages %d\n",
|
|
__func__, inode, max_resp_sz, max_pages);
|
|
|
|
pdev = kzalloc(sizeof(struct pnfs_device), gfp_flags);
|
|
if (pdev == NULL)
|
|
return NULL;
|
|
|
|
pages = kzalloc(max_pages * sizeof(struct page *), gfp_flags);
|
|
if (pages == NULL) {
|
|
kfree(pdev);
|
|
return NULL;
|
|
}
|
|
for (i = 0; i < max_pages; i++) {
|
|
pages[i] = alloc_page(gfp_flags);
|
|
if (!pages[i])
|
|
goto out_free;
|
|
}
|
|
|
|
memcpy(&pdev->dev_id, dev_id, sizeof(*dev_id));
|
|
pdev->layout_type = LAYOUT_NFSV4_1_FILES;
|
|
pdev->pages = pages;
|
|
pdev->pgbase = 0;
|
|
pdev->pglen = max_resp_sz;
|
|
pdev->mincount = 0;
|
|
pdev->maxcount = max_resp_sz - nfs41_maxgetdevinfo_overhead;
|
|
|
|
rc = nfs4_proc_getdeviceinfo(server, pdev, cred);
|
|
dprintk("%s getdevice info returns %d\n", __func__, rc);
|
|
if (rc)
|
|
goto out_free;
|
|
|
|
/*
|
|
* Found new device, need to decode it and then add it to the
|
|
* list of known devices for this mountpoint.
|
|
*/
|
|
dsaddr = decode_and_add_device(inode, pdev, gfp_flags);
|
|
out_free:
|
|
for (i = 0; i < max_pages; i++)
|
|
__free_page(pages[i]);
|
|
kfree(pages);
|
|
kfree(pdev);
|
|
dprintk("<-- %s dsaddr %p\n", __func__, dsaddr);
|
|
return dsaddr;
|
|
}
|
|
|
|
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];
|
|
}
|
|
|
|
static void nfs4_wait_ds_connect(struct nfs4_pnfs_ds *ds)
|
|
{
|
|
might_sleep();
|
|
wait_on_bit(&ds->ds_state, NFS4DS_CONNECTING,
|
|
nfs_wait_bit_killable, TASK_KILLABLE);
|
|
}
|
|
|
|
static void nfs4_clear_ds_conn_bit(struct nfs4_pnfs_ds *ds)
|
|
{
|
|
smp_mb__before_clear_bit();
|
|
clear_bit(NFS4DS_CONNECTING, &ds->ds_state);
|
|
smp_mb__after_clear_bit();
|
|
wake_up_bit(&ds->ds_state, NFS4DS_CONNECTING);
|
|
}
|
|
|
|
|
|
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;
|
|
|
|
if (ds == NULL) {
|
|
printk(KERN_ERR "NFS: %s: No data server for offset index %d\n",
|
|
__func__, ds_idx);
|
|
filelayout_mark_devid_invalid(devid);
|
|
goto out;
|
|
}
|
|
smp_rmb();
|
|
if (ds->ds_clp)
|
|
goto out_test_devid;
|
|
|
|
if (test_and_set_bit(NFS4DS_CONNECTING, &ds->ds_state) == 0) {
|
|
struct nfs_server *s = NFS_SERVER(lseg->pls_layout->plh_inode);
|
|
int err;
|
|
|
|
err = nfs4_ds_connect(s, ds);
|
|
if (err)
|
|
nfs4_mark_deviceid_unavailable(devid);
|
|
nfs4_clear_ds_conn_bit(ds);
|
|
} else {
|
|
/* Either ds is connected, or ds is NULL */
|
|
nfs4_wait_ds_connect(ds);
|
|
}
|
|
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.");
|