NFS: Parse and store all multipath DS addresses
This parses and stores all addresses associated with each data server, laying the groundwork for supporting multipath to data servers. - Skips over addresses that cannot be parsed (ie IPv6 addrs if v6 is not enabled). Only fails if none of the addresses are recognizable - Currently only uses the first address that parsed cleanly - Tested against pynfs server (modified to support multipath) Signed-off-by: Weston Andros Adamson <dros@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Weston Andros Adamson
Trond Myklebust
Родитель
c9895cb69b
Коммит
14f9a6076f
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@ -47,11 +47,17 @@ enum stripetype4 {
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};
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/* Individual ip address */
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struct nfs4_pnfs_ds_addr {
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struct sockaddr_storage da_addr;
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size_t da_addrlen;
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struct list_head da_node; /* nfs4_pnfs_dev_hlist dev_dslist */
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char *da_remotestr; /* human readable addr+port */
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};
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struct nfs4_pnfs_ds {
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struct list_head ds_node; /* nfs4_pnfs_dev_hlist dev_dslist */
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struct sockaddr_storage ds_addr;
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size_t ds_addrlen;
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char *ds_remotestr; /* human readable addr+port */
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char *ds_remotestr; /* comma sep list of addrs */
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struct list_head ds_addrs;
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struct nfs_client *ds_clp;
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atomic_t ds_count;
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};
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@ -65,52 +65,103 @@ print_ds(struct nfs4_pnfs_ds *ds)
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ds->ds_clp ? ds->ds_clp->cl_exchange_flags : 0);
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}
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/* nfs4_ds_cache_lock is held */
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static struct nfs4_pnfs_ds *
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_data_server_lookup_locked(struct sockaddr *addr, size_t addrlen)
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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 nfs4_pnfs_ds *ds;
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struct sockaddr_in *a, *b;
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struct sockaddr_in6 *a6, *b6;
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list_for_each_entry(ds, &nfs4_data_server_cache, ds_node) {
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if (addr->sa_family != ds->ds_addr.ss_family)
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continue;
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if (addr1->sa_family != addr2->sa_family)
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return false;
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switch (addr->sa_family) {
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case AF_INET:
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a = (struct sockaddr_in *)addr;
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b = (struct sockaddr_in *)&ds->ds_addr;
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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 ds;
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break;
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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 *)addr;
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b6 = (struct sockaddr_in6 *)&ds->ds_addr;
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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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continue;
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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 ds;
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break;
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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__, addr->sa_family);
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return NULL;
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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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/*
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* Lookup DS by addresses. The first matching address returns true.
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* 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(struct list_head *dsaddrs)
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{
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struct nfs4_pnfs_ds *ds;
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struct nfs4_pnfs_ds_addr *da1, *da2;
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list_for_each_entry(da1, dsaddrs, da_node) {
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list_for_each_entry(ds, &nfs4_data_server_cache, ds_node) {
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list_for_each_entry(da2, &ds->ds_addrs, da_node) {
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if (same_sockaddr(
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(struct sockaddr *)&da1->da_addr,
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(struct sockaddr *)&da2->da_addr))
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return ds;
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}
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}
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}
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return NULL;
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}
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/*
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* Compare two lists of addresses.
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*/
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static bool
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_data_server_match_all_addrs_locked(struct list_head *dsaddrs1,
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struct list_head *dsaddrs2)
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{
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struct nfs4_pnfs_ds_addr *da1, *da2;
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size_t count1 = 0,
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count2 = 0;
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list_for_each_entry(da1, dsaddrs1, da_node)
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count1++;
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list_for_each_entry(da2, dsaddrs2, da_node) {
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bool found = false;
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count2++;
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list_for_each_entry(da1, dsaddrs1, 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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found = true;
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break;
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}
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}
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if (!found)
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return false;
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}
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return (count1 == count2);
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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 support IPv4
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@ -119,14 +170,21 @@ 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;
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struct nfs4_pnfs_ds_addr *da;
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int status = 0;
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dprintk("--> %s addr %s au_flavor %d\n", __func__, ds->ds_remotestr,
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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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BUG_ON(list_empty(&ds->ds_addrs));
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da = list_first_entry(&ds->ds_addrs, struct nfs4_pnfs_ds_addr, da_node);
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dprintk("%s: using the first address for DS %s: %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 *)&ds->ds_addr,
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ds->ds_addrlen, IPPROTO_TCP);
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(struct sockaddr *)&da->da_addr,
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da->da_addrlen, IPPROTO_TCP);
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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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@ -169,12 +227,24 @@ out_put:
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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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@ -207,67 +277,73 @@ nfs4_fl_free_deviceid(struct nfs4_file_layout_dsaddr *dsaddr)
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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 sockaddr *ds_addr, gfp_t gfp_flags)
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nfs4_pnfs_remotestr(struct list_head *dsaddrs, gfp_t gfp_flags)
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{
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char buf[INET6_ADDRSTRLEN + IPV6_SCOPE_ID_LEN];
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struct nfs4_pnfs_ds_addr *da;
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char *remotestr;
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char *startsep = "";
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char *endsep = "";
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size_t len;
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uint16_t port;
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char *p;
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switch (ds_addr->sa_family) {
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case AF_INET:
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port = ((struct sockaddr_in *)ds_addr)->sin_port;
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break;
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case AF_INET6:
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startsep = "[";
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endsep = "]";
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port = ((struct sockaddr_in6 *)ds_addr)->sin6_port;
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break;
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default:
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dprintk("%s: Unknown address family %u\n",
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__func__, ds_addr->sa_family);
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return NULL;
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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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if (!rpc_ntop((struct sockaddr *)ds_addr, buf, sizeof(buf))) {
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dprintk("%s: error printing addr\n", __func__);
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return NULL;
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}
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len = strlen(buf) + strlen(startsep) + strlen(endsep) + 1 + 5 + 1;
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remotestr = kzalloc(len, gfp_flags);
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if (unlikely(!remotestr)) {
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dprintk("%s: couldn't alloc remotestr\n", __func__);
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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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snprintf(remotestr, len, "%s%s%s:%u",
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startsep, buf, endsep, ntohs(port));
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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 sockaddr *addr, size_t addrlen, gfp_t gfp_flags)
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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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ds = kzalloc(sizeof(*tmp_ds), gfp_flags);
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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(addr, gfp_flags);
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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(addr, addrlen);
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tmp_ds = _data_server_lookup_locked(dsaddrs);
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if (tmp_ds == NULL) {
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memcpy(&ds->ds_addr, addr, addrlen);
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ds->ds_addrlen = addrlen;
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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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@ -276,6 +352,11 @@ nfs4_pnfs_ds_add(struct sockaddr *addr, size_t addrlen, gfp_t gfp_flags)
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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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if (!_data_server_match_all_addrs_locked(&tmp_ds->ds_addrs,
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dsaddrs)) {
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dprintk("%s: multipath address mismatch: %s != %s",
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__func__, tmp_ds->ds_remotestr, remotestr);
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}
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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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@ -292,19 +373,20 @@ out:
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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 *
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decode_and_add_ds(struct xdr_stream *streamp, struct inode *inode, gfp_t gfp_flags)
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static struct nfs4_pnfs_ds_addr *
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decode_ds_addr(struct xdr_stream *streamp, gfp_t gfp_flags)
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{
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struct nfs4_pnfs_ds *ds = NULL;
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struct nfs4_pnfs_ds_addr *da = NULL;
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char *buf, *portstr;
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struct sockaddr_storage ss;
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size_t sslen;
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u32 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 match_netid_len;
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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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@ -365,50 +447,74 @@ decode_and_add_ds(struct xdr_stream *streamp, struct inode *inode, gfp_t gfp_fla
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}
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*portstr = '\0';
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if (!rpc_pton(buf, portstr-buf, (struct sockaddr *)&ss, sizeof(ss))) {
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dprintk("%s: Error parsing address %s\n", __func__, buf);
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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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|
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INIT_LIST_HEAD(&da->da_node);
|
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|
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if (!rpc_pton(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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|
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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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|
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switch (ss.ss_family) {
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switch (da->da_addr.ss_family) {
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case AF_INET:
|
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((struct sockaddr_in *)&ss)->sin_port = port;
|
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sslen = sizeof(struct sockaddr_in);
|
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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;
|
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|
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case AF_INET6:
|
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((struct sockaddr_in6 *)&ss)->sin6_port = port;
|
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sslen = sizeof(struct sockaddr_in6);
|
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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;
|
||||
|
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default:
|
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dprintk("%s: unsupported address family: %u\n",
|
||||
__func__, ss.ss_family);
|
||||
goto out_free_buf;
|
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__func__, da->da_addr.ss_family);
|
||||
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",
|
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__func__, netid, match_netid);
|
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goto out_free_buf;
|
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goto out_free_da;
|
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}
|
||||
|
||||
ds = nfs4_pnfs_ds_add((struct sockaddr *)&ss, sslen, gfp_flags);
|
||||
dprintk("%s: Added DS %s\n", __func__, ds->ds_remotestr);
|
||||
/* 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,
|
||||
buf, endsep, ntohs(port));
|
||||
|
||||
dprintk("%s: Parsed DS addr %s\n", __func__, da->da_remotestr);
|
||||
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 ds;
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/* Decode opaque device data and return the result */
|
||||
|
|
@ -425,6 +531,8 @@ decode_device(struct inode *ino, struct pnfs_device *pdev, gfp_t gfp_flags)
|
|||
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);
|
||||
|
|
@ -501,6 +609,8 @@ decode_device(struct inode *ino, struct pnfs_device *pdev, gfp_t gfp_flags)
|
|||
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;
|
||||
|
|
@ -510,48 +620,43 @@ decode_device(struct inode *ino, struct pnfs_device *pdev, gfp_t gfp_flags)
|
|||
goto out_err_free_deviceid;
|
||||
|
||||
mp_count = be32_to_cpup(p); /* multipath count */
|
||||
if (mp_count > 1) {
|
||||
printk(KERN_WARNING
|
||||
"%s: Multipath count %d not supported, "
|
||||
"skipping all greater than 1\n", __func__,
|
||||
mp_count);
|
||||
}
|
||||
for (j = 0; j < mp_count; j++) {
|
||||
if (j == 0) {
|
||||
dsaddr->ds_list[i] = decode_and_add_ds(&stream,
|
||||
ino, gfp_flags);
|
||||
if (dsaddr->ds_list[i] == NULL)
|
||||
goto out_err_free_deviceid;
|
||||
} else {
|
||||
u32 len;
|
||||
/* skip extra multipath */
|
||||
da = decode_ds_addr(&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;
|
||||
}
|
||||
|
||||
/* read len, skip */
|
||||
p = xdr_inline_decode(&stream, 4);
|
||||
if (unlikely(!p))
|
||||
goto out_err_free_deviceid;
|
||||
len = be32_to_cpup(p);
|
||||
dsaddr->ds_list[i] = nfs4_pnfs_ds_add(&dsaddrs, gfp_flags);
|
||||
if (!dsaddr->ds_list[i])
|
||||
goto out_err_drain_dsaddrs;
|
||||
|
||||
p = xdr_inline_decode(&stream, len);
|
||||
if (unlikely(!p))
|
||||
goto out_err_free_deviceid;
|
||||
|
||||
/* read len, skip */
|
||||
p = xdr_inline_decode(&stream, 4);
|
||||
if (unlikely(!p))
|
||||
goto out_err_free_deviceid;
|
||||
len = be32_to_cpup(p);
|
||||
|
||||
p = xdr_inline_decode(&stream, len);
|
||||
if (unlikely(!p))
|
||||
goto out_err_free_deviceid;
|
||||
}
|
||||
/* 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 */
|
||||
|
|
|
|||
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