--- /dev/null
+/*
+ * Common NFS I/O operations for the pnfs file based
+ * layout drivers.
+ *
+ * Copyright (c) 2014, Primary Data, Inc. All rights reserved.
+ *
+ * Tom Haynes <loghyr@primarydata.com>
+ */
+
+#include <linux/nfs_fs.h>
+#include <linux/nfs_page.h>
+#include <linux/sunrpc/addr.h>
+#include <linux/module.h>
+
+#include "nfs4session.h"
+#include "internal.h"
+#include "pnfs.h"
+
+#define NFSDBG_FACILITY NFSDBG_PNFS
+
+void pnfs_generic_rw_release(void *data)
+{
+ struct nfs_pgio_header *hdr = data;
+
+ nfs_put_client(hdr->ds_clp);
+ hdr->mds_ops->rpc_release(data);
+}
+EXPORT_SYMBOL_GPL(pnfs_generic_rw_release);
+
+/* Fake up some data that will cause nfs_commit_release to retry the writes. */
+void pnfs_generic_prepare_to_resend_writes(struct nfs_commit_data *data)
+{
+ struct nfs_page *first = nfs_list_entry(data->pages.next);
+
+ data->task.tk_status = 0;
+ memcpy(&data->verf.verifier, &first->wb_verf,
+ sizeof(data->verf.verifier));
+ data->verf.verifier.data[0]++; /* ensure verifier mismatch */
+}
+EXPORT_SYMBOL_GPL(pnfs_generic_prepare_to_resend_writes);
+
+void pnfs_generic_write_commit_done(struct rpc_task *task, void *data)
+{
+ struct nfs_commit_data *wdata = data;
+
+ /* Note this may cause RPC to be resent */
+ wdata->mds_ops->rpc_call_done(task, data);
+}
+EXPORT_SYMBOL_GPL(pnfs_generic_write_commit_done);
+
+void pnfs_generic_commit_release(void *calldata)
+{
+ struct nfs_commit_data *data = calldata;
+
+ data->completion_ops->completion(data);
+ pnfs_put_lseg(data->lseg);
+ nfs_put_client(data->ds_clp);
+ nfs_commitdata_release(data);
+}
+EXPORT_SYMBOL_GPL(pnfs_generic_commit_release);
+
+/* The generic layer is about to remove the req from the commit list.
+ * If this will make the bucket empty, it will need to put the lseg reference.
+ * Note this must be called holding the inode (/cinfo) lock
+ */
+void
+pnfs_generic_clear_request_commit(struct nfs_page *req,
+ struct nfs_commit_info *cinfo)
+{
+ struct pnfs_layout_segment *freeme = NULL;
+
+ if (!test_and_clear_bit(PG_COMMIT_TO_DS, &req->wb_flags))
+ goto out;
+ cinfo->ds->nwritten--;
+ if (list_is_singular(&req->wb_list)) {
+ struct pnfs_commit_bucket *bucket;
+
+ bucket = list_first_entry(&req->wb_list,
+ struct pnfs_commit_bucket,
+ written);
+ freeme = bucket->wlseg;
+ bucket->wlseg = NULL;
+ }
+out:
+ nfs_request_remove_commit_list(req, cinfo);
+ pnfs_put_lseg_locked(freeme);
+}
+EXPORT_SYMBOL_GPL(pnfs_generic_clear_request_commit);
+
+static int
+pnfs_generic_transfer_commit_list(struct list_head *src, struct list_head *dst,
+ struct nfs_commit_info *cinfo, int max)
+{
+ struct nfs_page *req, *tmp;
+ int ret = 0;
+
+ list_for_each_entry_safe(req, tmp, src, wb_list) {
+ if (!nfs_lock_request(req))
+ continue;
+ kref_get(&req->wb_kref);
+ if (cond_resched_lock(cinfo->lock))
+ list_safe_reset_next(req, tmp, wb_list);
+ nfs_request_remove_commit_list(req, cinfo);
+ clear_bit(PG_COMMIT_TO_DS, &req->wb_flags);
+ nfs_list_add_request(req, dst);
+ ret++;
+ if ((ret == max) && !cinfo->dreq)
+ break;
+ }
+ return ret;
+}
+
+static int
+pnfs_generic_scan_ds_commit_list(struct pnfs_commit_bucket *bucket,
+ struct nfs_commit_info *cinfo,
+ int max)
+{
+ struct list_head *src = &bucket->written;
+ struct list_head *dst = &bucket->committing;
+ int ret;
+
+ lockdep_assert_held(cinfo->lock);
+ ret = pnfs_generic_transfer_commit_list(src, dst, cinfo, max);
+ if (ret) {
+ cinfo->ds->nwritten -= ret;
+ cinfo->ds->ncommitting += ret;
+ bucket->clseg = bucket->wlseg;
+ if (list_empty(src))
+ bucket->wlseg = NULL;
+ else
+ pnfs_get_lseg(bucket->clseg);
+ }
+ return ret;
+}
+
+/* Move reqs from written to committing lists, returning count
+ * of number moved.
+ */
+int pnfs_generic_scan_commit_lists(struct nfs_commit_info *cinfo,
+ int max)
+{
+ int i, rv = 0, cnt;
+
+ lockdep_assert_held(cinfo->lock);
+ for (i = 0; i < cinfo->ds->nbuckets && max != 0; i++) {
+ cnt = pnfs_generic_scan_ds_commit_list(&cinfo->ds->buckets[i],
+ cinfo, max);
+ max -= cnt;
+ rv += cnt;
+ }
+ return rv;
+}
+EXPORT_SYMBOL_GPL(pnfs_generic_scan_commit_lists);
+
+/* Pull everything off the committing lists and dump into @dst. */
+void pnfs_generic_recover_commit_reqs(struct list_head *dst,
+ struct nfs_commit_info *cinfo)
+{
+ struct pnfs_commit_bucket *b;
+ struct pnfs_layout_segment *freeme;
+ int i;
+
+ lockdep_assert_held(cinfo->lock);
+restart:
+ for (i = 0, b = cinfo->ds->buckets; i < cinfo->ds->nbuckets; i++, b++) {
+ if (pnfs_generic_transfer_commit_list(&b->written, dst,
+ cinfo, 0)) {
+ freeme = b->wlseg;
+ b->wlseg = NULL;
+ spin_unlock(cinfo->lock);
+ pnfs_put_lseg(freeme);
+ spin_lock(cinfo->lock);
+ goto restart;
+ }
+ }
+ cinfo->ds->nwritten = 0;
+}
+EXPORT_SYMBOL_GPL(pnfs_generic_recover_commit_reqs);
+
+static void pnfs_generic_retry_commit(struct nfs_commit_info *cinfo, int idx)
+{
+ struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds;
+ struct pnfs_commit_bucket *bucket;
+ struct pnfs_layout_segment *freeme;
+ int i;
+
+ for (i = idx; i < fl_cinfo->nbuckets; i++) {
+ bucket = &fl_cinfo->buckets[i];
+ if (list_empty(&bucket->committing))
+ continue;
+ nfs_retry_commit(&bucket->committing, bucket->clseg, cinfo, i);
+ spin_lock(cinfo->lock);
+ freeme = bucket->clseg;
+ bucket->clseg = NULL;
+ spin_unlock(cinfo->lock);
+ pnfs_put_lseg(freeme);
+ }
+}
+
+static unsigned int
+pnfs_generic_alloc_ds_commits(struct nfs_commit_info *cinfo,
+ struct list_head *list)
+{
+ struct pnfs_ds_commit_info *fl_cinfo;
+ struct pnfs_commit_bucket *bucket;
+ struct nfs_commit_data *data;
+ int i;
+ unsigned int nreq = 0;
+
+ fl_cinfo = cinfo->ds;
+ bucket = fl_cinfo->buckets;
+ for (i = 0; i < fl_cinfo->nbuckets; i++, bucket++) {
+ if (list_empty(&bucket->committing))
+ continue;
+ data = nfs_commitdata_alloc();
+ if (!data)
+ break;
+ data->ds_commit_index = i;
+ spin_lock(cinfo->lock);
+ data->lseg = bucket->clseg;
+ bucket->clseg = NULL;
+ spin_unlock(cinfo->lock);
+ list_add(&data->pages, list);
+ nreq++;
+ }
+
+ /* Clean up on error */
+ pnfs_generic_retry_commit(cinfo, i);
+ return nreq;
+}
+
+/* This follows nfs_commit_list pretty closely */
+int
+pnfs_generic_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
+ int how, struct nfs_commit_info *cinfo,
+ int (*initiate_commit)(struct nfs_commit_data *data,
+ int how))
+{
+ struct nfs_commit_data *data, *tmp;
+ LIST_HEAD(list);
+ unsigned int nreq = 0;
+
+ if (!list_empty(mds_pages)) {
+ data = nfs_commitdata_alloc();
+ if (data != NULL) {
+ data->lseg = NULL;
+ list_add(&data->pages, &list);
+ nreq++;
+ } else {
+ nfs_retry_commit(mds_pages, NULL, cinfo, 0);
+ pnfs_generic_retry_commit(cinfo, 0);
+ cinfo->completion_ops->error_cleanup(NFS_I(inode));
+ return -ENOMEM;
+ }
+ }
+
+ nreq += pnfs_generic_alloc_ds_commits(cinfo, &list);
+
+ if (nreq == 0) {
+ cinfo->completion_ops->error_cleanup(NFS_I(inode));
+ goto out;
+ }
+
+ atomic_add(nreq, &cinfo->mds->rpcs_out);
+
+ list_for_each_entry_safe(data, tmp, &list, pages) {
+ list_del_init(&data->pages);
+ if (!data->lseg) {
+ nfs_init_commit(data, mds_pages, NULL, cinfo);
+ nfs_initiate_commit(NFS_CLIENT(inode), data,
+ NFS_PROTO(data->inode),
+ data->mds_ops, how, 0);
+ } else {
+ struct pnfs_commit_bucket *buckets;
+
+ buckets = cinfo->ds->buckets;
+ nfs_init_commit(data,
+ &buckets[data->ds_commit_index].committing,
+ data->lseg,
+ cinfo);
+ initiate_commit(data, how);
+ }
+ }
+out:
+ cinfo->ds->ncommitting = 0;
+ return PNFS_ATTEMPTED;
+}
+EXPORT_SYMBOL_GPL(pnfs_generic_commit_pagelist);
+
+/*
+ * Data server cache
+ *
+ * Data servers can be mapped to different device ids.
+ * nfs4_pnfs_ds reference counting
+ * - set to 1 on allocation
+ * - incremented when a device id maps a data server already in the cache.
+ * - decremented when deviceid is removed from the cache.
+ */
+static DEFINE_SPINLOCK(nfs4_ds_cache_lock);
+static LIST_HEAD(nfs4_data_server_cache);
+
+/* Debug routines */
+static void
+print_ds(struct nfs4_pnfs_ds *ds)
+{
+ if (ds == NULL) {
+ printk(KERN_WARNING "%s NULL device\n", __func__);
+ return;
+ }
+ printk(KERN_WARNING " ds %s\n"
+ " ref count %d\n"
+ " client %p\n"
+ " cl_exchange_flags %x\n",
+ ds->ds_remotestr,
+ atomic_read(&ds->ds_count), ds->ds_clp,
+ ds->ds_clp ? ds->ds_clp->cl_exchange_flags : 0);
+}
+
+static bool
+same_sockaddr(struct sockaddr *addr1, struct sockaddr *addr2)
+{
+ struct sockaddr_in *a, *b;
+ struct sockaddr_in6 *a6, *b6;
+
+ if (addr1->sa_family != addr2->sa_family)
+ return false;
+
+ switch (addr1->sa_family) {
+ case AF_INET:
+ a = (struct sockaddr_in *)addr1;
+ b = (struct sockaddr_in *)addr2;
+
+ if (a->sin_addr.s_addr == b->sin_addr.s_addr &&
+ a->sin_port == b->sin_port)
+ return true;
+ break;
+
+ case AF_INET6:
+ a6 = (struct sockaddr_in6 *)addr1;
+ b6 = (struct sockaddr_in6 *)addr2;
+
+ /* LINKLOCAL addresses must have matching scope_id */
+ if (ipv6_addr_src_scope(&a6->sin6_addr) ==
+ IPV6_ADDR_SCOPE_LINKLOCAL &&
+ a6->sin6_scope_id != b6->sin6_scope_id)
+ return false;
+
+ if (ipv6_addr_equal(&a6->sin6_addr, &b6->sin6_addr) &&
+ a6->sin6_port == b6->sin6_port)
+ return true;
+ break;
+
+ default:
+ dprintk("%s: unhandled address family: %u\n",
+ __func__, addr1->sa_family);
+ return false;
+ }
+
+ return false;
+}
+
+static bool
+_same_data_server_addrs_locked(const struct list_head *dsaddrs1,
+ const struct list_head *dsaddrs2)
+{
+ struct nfs4_pnfs_ds_addr *da1, *da2;
+
+ /* step through both lists, comparing as we go */
+ for (da1 = list_first_entry(dsaddrs1, typeof(*da1), da_node),
+ da2 = list_first_entry(dsaddrs2, typeof(*da2), da_node);
+ da1 != NULL && da2 != NULL;
+ da1 = list_entry(da1->da_node.next, typeof(*da1), da_node),
+ da2 = list_entry(da2->da_node.next, typeof(*da2), da_node)) {
+ if (!same_sockaddr((struct sockaddr *)&da1->da_addr,
+ (struct sockaddr *)&da2->da_addr))
+ return false;
+ }
+ if (da1 == NULL && da2 == NULL)
+ return true;
+
+ return false;
+}
+
+/*
+ * Lookup DS by addresses. nfs4_ds_cache_lock is held
+ */
+static struct nfs4_pnfs_ds *
+_data_server_lookup_locked(const struct list_head *dsaddrs)
+{
+ struct nfs4_pnfs_ds *ds;
+
+ list_for_each_entry(ds, &nfs4_data_server_cache, ds_node)
+ if (_same_data_server_addrs_locked(&ds->ds_addrs, dsaddrs))
+ return ds;
+ return NULL;
+}
+
+static void destroy_ds(struct nfs4_pnfs_ds *ds)
+{
+ struct nfs4_pnfs_ds_addr *da;
+
+ dprintk("--> %s\n", __func__);
+ ifdebug(FACILITY)
+ print_ds(ds);
+
+ nfs_put_client(ds->ds_clp);
+
+ while (!list_empty(&ds->ds_addrs)) {
+ da = list_first_entry(&ds->ds_addrs,
+ struct nfs4_pnfs_ds_addr,
+ da_node);
+ list_del_init(&da->da_node);
+ kfree(da->da_remotestr);
+ kfree(da);
+ }
+
+ kfree(ds->ds_remotestr);
+ kfree(ds);
+}
+
+void nfs4_pnfs_ds_put(struct nfs4_pnfs_ds *ds)
+{
+ if (atomic_dec_and_lock(&ds->ds_count,
+ &nfs4_ds_cache_lock)) {
+ list_del_init(&ds->ds_node);
+ spin_unlock(&nfs4_ds_cache_lock);
+ destroy_ds(ds);
+ }
+}
+EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_put);
+
+/*
+ * Create a string with a human readable address and port to avoid
+ * complicated setup around many dprinks.
+ */
+static char *
+nfs4_pnfs_remotestr(struct list_head *dsaddrs, gfp_t gfp_flags)
+{
+ struct nfs4_pnfs_ds_addr *da;
+ char *remotestr;
+ size_t len;
+ char *p;
+
+ len = 3; /* '{', '}' and eol */
+ list_for_each_entry(da, dsaddrs, da_node) {
+ len += strlen(da->da_remotestr) + 1; /* string plus comma */
+ }
+
+ remotestr = kzalloc(len, gfp_flags);
+ if (!remotestr)
+ return NULL;
+
+ p = remotestr;
+ *(p++) = '{';
+ len--;
+ list_for_each_entry(da, dsaddrs, da_node) {
+ size_t ll = strlen(da->da_remotestr);
+
+ if (ll > len)
+ goto out_err;
+
+ memcpy(p, da->da_remotestr, ll);
+ p += ll;
+ len -= ll;
+
+ if (len < 1)
+ goto out_err;
+ (*p++) = ',';
+ len--;
+ }
+ if (len < 2)
+ goto out_err;
+ *(p++) = '}';
+ *p = '\0';
+ return remotestr;
+out_err:
+ kfree(remotestr);
+ return NULL;
+}
+
+/*
+ * Given a list of multipath struct nfs4_pnfs_ds_addr, add it to ds cache if
+ * uncached and return cached struct nfs4_pnfs_ds.
+ */
+struct nfs4_pnfs_ds *
+nfs4_pnfs_ds_add(struct list_head *dsaddrs, gfp_t gfp_flags)
+{
+ struct nfs4_pnfs_ds *tmp_ds, *ds = NULL;
+ char *remotestr;
+
+ if (list_empty(dsaddrs)) {
+ dprintk("%s: no addresses defined\n", __func__);
+ goto out;
+ }
+
+ ds = kzalloc(sizeof(*ds), gfp_flags);
+ if (!ds)
+ goto out;
+
+ /* this is only used for debugging, so it's ok if its NULL */
+ remotestr = nfs4_pnfs_remotestr(dsaddrs, gfp_flags);
+
+ spin_lock(&nfs4_ds_cache_lock);
+ tmp_ds = _data_server_lookup_locked(dsaddrs);
+ if (tmp_ds == NULL) {
+ INIT_LIST_HEAD(&ds->ds_addrs);
+ list_splice_init(dsaddrs, &ds->ds_addrs);
+ ds->ds_remotestr = remotestr;
+ atomic_set(&ds->ds_count, 1);
+ INIT_LIST_HEAD(&ds->ds_node);
+ ds->ds_clp = NULL;
+ list_add(&ds->ds_node, &nfs4_data_server_cache);
+ dprintk("%s add new data server %s\n", __func__,
+ ds->ds_remotestr);
+ } else {
+ kfree(remotestr);
+ kfree(ds);
+ atomic_inc(&tmp_ds->ds_count);
+ dprintk("%s data server %s found, inc'ed ds_count to %d\n",
+ __func__, tmp_ds->ds_remotestr,
+ atomic_read(&tmp_ds->ds_count));
+ ds = tmp_ds;
+ }
+ spin_unlock(&nfs4_ds_cache_lock);
+out:
+ return ds;
+}
+EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_add);
+
+static void nfs4_wait_ds_connect(struct nfs4_pnfs_ds *ds)
+{
+ might_sleep();
+ wait_on_bit(&ds->ds_state, NFS4DS_CONNECTING,
+ TASK_KILLABLE);
+}
+
+static void nfs4_clear_ds_conn_bit(struct nfs4_pnfs_ds *ds)
+{
+ smp_mb__before_atomic();
+ clear_bit(NFS4DS_CONNECTING, &ds->ds_state);
+ smp_mb__after_atomic();
+ wake_up_bit(&ds->ds_state, NFS4DS_CONNECTING);
+}
+
+static struct nfs_client *(*get_v3_ds_connect)(
+ struct nfs_client *mds_clp,
+ const struct sockaddr *ds_addr,
+ int ds_addrlen,
+ int ds_proto,
+ unsigned int ds_timeo,
+ unsigned int ds_retrans,
+ rpc_authflavor_t au_flavor);
+
+static bool load_v3_ds_connect(void)
+{
+ if (!get_v3_ds_connect) {
+ get_v3_ds_connect = symbol_request(nfs3_set_ds_client);
+ WARN_ON_ONCE(!get_v3_ds_connect);
+ }
+
+ return(get_v3_ds_connect != NULL);
+}
+
+void nfs4_pnfs_v3_ds_connect_unload(void)
+{
+ if (get_v3_ds_connect) {
+ symbol_put(nfs3_set_ds_client);
+ get_v3_ds_connect = NULL;
+ }
+}
+EXPORT_SYMBOL_GPL(nfs4_pnfs_v3_ds_connect_unload);
+
+static int _nfs4_pnfs_v3_ds_connect(struct nfs_server *mds_srv,
+ struct nfs4_pnfs_ds *ds,
+ unsigned int timeo,
+ unsigned int retrans,
+ rpc_authflavor_t au_flavor)
+{
+ struct nfs_client *clp = ERR_PTR(-EIO);
+ struct nfs4_pnfs_ds_addr *da;
+ int status = 0;
+
+ dprintk("--> %s DS %s au_flavor %d\n", __func__,
+ ds->ds_remotestr, au_flavor);
+
+ if (!load_v3_ds_connect())
+ goto out;
+
+ list_for_each_entry(da, &ds->ds_addrs, da_node) {
+ dprintk("%s: DS %s: trying address %s\n",
+ __func__, ds->ds_remotestr, da->da_remotestr);
+
+ clp = get_v3_ds_connect(mds_srv->nfs_client,
+ (struct sockaddr *)&da->da_addr,
+ da->da_addrlen, IPPROTO_TCP,
+ timeo, retrans, au_flavor);
+ if (!IS_ERR(clp))
+ break;
+ }
+
+ if (IS_ERR(clp)) {
+ status = PTR_ERR(clp);
+ goto out;
+ }
+
+ smp_wmb();
+ ds->ds_clp = clp;
+ dprintk("%s [new] addr: %s\n", __func__, ds->ds_remotestr);
+out:
+ return status;
+}
+
+static int _nfs4_pnfs_v4_ds_connect(struct nfs_server *mds_srv,
+ struct nfs4_pnfs_ds *ds,
+ unsigned int timeo,
+ unsigned int retrans,
+ u32 minor_version,
+ rpc_authflavor_t au_flavor)
+{
+ struct nfs_client *clp = ERR_PTR(-EIO);
+ struct nfs4_pnfs_ds_addr *da;
+ int status = 0;
+
+ dprintk("--> %s DS %s au_flavor %d\n", __func__, ds->ds_remotestr,
+ au_flavor);
+
+ list_for_each_entry(da, &ds->ds_addrs, da_node) {
+ dprintk("%s: DS %s: trying address %s\n",
+ __func__, ds->ds_remotestr, da->da_remotestr);
+
+ clp = nfs4_set_ds_client(mds_srv->nfs_client,
+ (struct sockaddr *)&da->da_addr,
+ da->da_addrlen, IPPROTO_TCP,
+ timeo, retrans, minor_version,
+ au_flavor);
+ if (!IS_ERR(clp))
+ break;
+ }
+
+ if (IS_ERR(clp)) {
+ status = PTR_ERR(clp);
+ goto out;
+ }
+
+ status = nfs4_init_ds_session(clp, mds_srv->nfs_client->cl_lease_time);
+ if (status)
+ goto out_put;
+
+ smp_wmb();
+ ds->ds_clp = clp;
+ dprintk("%s [new] addr: %s\n", __func__, ds->ds_remotestr);
+out:
+ return status;
+out_put:
+ nfs_put_client(clp);
+ goto out;
+}
+
+/*
+ * Create an rpc connection to the nfs4_pnfs_ds data server.
+ * Currently only supports IPv4 and IPv6 addresses.
+ * If connection fails, make devid unavailable.
+ */
+void nfs4_pnfs_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds,
+ struct nfs4_deviceid_node *devid, unsigned int timeo,
+ unsigned int retrans, u32 version,
+ u32 minor_version, rpc_authflavor_t au_flavor)
+{
+ if (test_and_set_bit(NFS4DS_CONNECTING, &ds->ds_state) == 0) {
+ int err = 0;
+
+ if (version == 3) {
+ err = _nfs4_pnfs_v3_ds_connect(mds_srv, ds, timeo,
+ retrans, au_flavor);
+ } else if (version == 4) {
+ err = _nfs4_pnfs_v4_ds_connect(mds_srv, ds, timeo,
+ retrans, minor_version,
+ au_flavor);
+ } else {
+ dprintk("%s: unsupported DS version %d\n", __func__,
+ version);
+ err = -EPROTONOSUPPORT;
+ }
+
+ if (err)
+ nfs4_mark_deviceid_unavailable(devid);
+ nfs4_clear_ds_conn_bit(ds);
+ } else {
+ nfs4_wait_ds_connect(ds);
+ }
+}
+EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_connect);
+
+/*
+ * Currently only supports ipv4, ipv6 and one multi-path address.
+ */
+struct nfs4_pnfs_ds_addr *
+nfs4_decode_mp_ds_addr(struct net *net, struct xdr_stream *xdr, gfp_t gfp_flags)
+{
+ struct nfs4_pnfs_ds_addr *da = NULL;
+ char *buf, *portstr;
+ __be16 port;
+ int nlen, rlen;
+ int tmp[2];
+ __be32 *p;
+ char *netid, *match_netid;
+ size_t len, match_netid_len;
+ char *startsep = "";
+ char *endsep = "";
+
+
+ /* r_netid */
+ p = xdr_inline_decode(xdr, 4);
+ if (unlikely(!p))
+ goto out_err;
+ nlen = be32_to_cpup(p++);
+
+ p = xdr_inline_decode(xdr, nlen);
+ if (unlikely(!p))
+ goto out_err;
+
+ netid = kmalloc(nlen+1, gfp_flags);
+ if (unlikely(!netid))
+ goto out_err;
+
+ netid[nlen] = '\0';
+ memcpy(netid, p, nlen);
+
+ /* r_addr: ip/ip6addr with port in dec octets - see RFC 5665 */
+ p = xdr_inline_decode(xdr, 4);
+ if (unlikely(!p))
+ goto out_free_netid;
+ rlen = be32_to_cpup(p);
+
+ p = xdr_inline_decode(xdr, rlen);
+ if (unlikely(!p))
+ goto out_free_netid;
+
+ /* port is ".ABC.DEF", 8 chars max */
+ if (rlen > INET6_ADDRSTRLEN + IPV6_SCOPE_ID_LEN + 8) {
+ dprintk("%s: Invalid address, length %d\n", __func__,
+ rlen);
+ goto out_free_netid;
+ }
+ buf = kmalloc(rlen + 1, gfp_flags);
+ if (!buf) {
+ dprintk("%s: Not enough memory\n", __func__);
+ goto out_free_netid;
+ }
+ buf[rlen] = '\0';
+ memcpy(buf, p, rlen);
+
+ /* replace port '.' with '-' */
+ portstr = strrchr(buf, '.');
+ if (!portstr) {
+ dprintk("%s: Failed finding expected dot in port\n",
+ __func__);
+ goto out_free_buf;
+ }
+ *portstr = '-';
+
+ /* find '.' between address and port */
+ portstr = strrchr(buf, '.');
+ if (!portstr) {
+ dprintk("%s: Failed finding expected dot between address and "
+ "port\n", __func__);
+ goto out_free_buf;
+ }
+ *portstr = '\0';
+
+ da = kzalloc(sizeof(*da), gfp_flags);
+ if (unlikely(!da))
+ goto out_free_buf;
+
+ INIT_LIST_HEAD(&da->da_node);
+
+ if (!rpc_pton(net, buf, portstr-buf, (struct sockaddr *)&da->da_addr,
+ sizeof(da->da_addr))) {
+ dprintk("%s: error parsing address %s\n", __func__, buf);
+ goto out_free_da;
+ }
+
+ portstr++;
+ sscanf(portstr, "%d-%d", &tmp[0], &tmp[1]);
+ port = htons((tmp[0] << 8) | (tmp[1]));
+
+ switch (da->da_addr.ss_family) {
+ case AF_INET:
+ ((struct sockaddr_in *)&da->da_addr)->sin_port = port;
+ da->da_addrlen = sizeof(struct sockaddr_in);
+ match_netid = "tcp";
+ match_netid_len = 3;
+ break;
+
+ case AF_INET6:
+ ((struct sockaddr_in6 *)&da->da_addr)->sin6_port = port;
+ da->da_addrlen = sizeof(struct sockaddr_in6);
+ match_netid = "tcp6";
+ match_netid_len = 4;
+ startsep = "[";
+ endsep = "]";
+ break;
+
+ default:
+ dprintk("%s: unsupported address family: %u\n",
+ __func__, da->da_addr.ss_family);
+ goto out_free_da;
+ }
+
+ if (nlen != match_netid_len || strncmp(netid, match_netid, nlen)) {
+ dprintk("%s: ERROR: r_netid \"%s\" != \"%s\"\n",
+ __func__, netid, match_netid);
+ 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,
+ 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 NULL;
+}
+EXPORT_SYMBOL_GPL(nfs4_decode_mp_ds_addr);
+
+void
+pnfs_layout_mark_request_commit(struct nfs_page *req,
+ struct pnfs_layout_segment *lseg,
+ struct nfs_commit_info *cinfo,
+ u32 ds_commit_idx)
+{
+ struct list_head *list;
+ struct pnfs_commit_bucket *buckets;
+
+ spin_lock(cinfo->lock);
+ buckets = cinfo->ds->buckets;
+ list = &buckets[ds_commit_idx].written;
+ if (list_empty(list)) {
+ /* Non-empty buckets hold a reference on the lseg. That ref
+ * is normally transferred to the COMMIT call and released
+ * there. It could also be released if the last req is pulled
+ * off due to a rewrite, in which case it will be done in
+ * pnfs_common_clear_request_commit
+ */
+ WARN_ON_ONCE(buckets[ds_commit_idx].wlseg != NULL);
+ buckets[ds_commit_idx].wlseg = pnfs_get_lseg(lseg);
+ }
+ set_bit(PG_COMMIT_TO_DS, &req->wb_flags);
+ cinfo->ds->nwritten++;
+ spin_unlock(cinfo->lock);
+
+ nfs_request_add_commit_list(req, list, cinfo);
+}
+EXPORT_SYMBOL_GPL(pnfs_layout_mark_request_commit);
+
+int
+pnfs_nfs_generic_sync(struct inode *inode, bool datasync)
+{
+ if (datasync)
+ return 0;
+ return pnfs_layoutcommit_inode(inode, true);
+}
+EXPORT_SYMBOL_GPL(pnfs_nfs_generic_sync);
+
Code Review / kvmfornfv.git / blobdiff