| /* |
| * 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; |
| if (bucket->clseg == NULL) |
| bucket->clseg = pnfs_get_lseg(bucket->wlseg); |
| if (list_empty(src)) { |
| pnfs_put_lseg_locked(bucket->wlseg); |
| bucket->wlseg = NULL; |
| } |
| } |
| 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; |
| LIST_HEAD(pages); |
| int i; |
| |
| spin_lock(cinfo->lock); |
| for (i = idx; i < fl_cinfo->nbuckets; i++) { |
| bucket = &fl_cinfo->buckets[i]; |
| if (list_empty(&bucket->committing)) |
| continue; |
| freeme = bucket->clseg; |
| bucket->clseg = NULL; |
| list_splice_init(&bucket->committing, &pages); |
| spin_unlock(cinfo->lock); |
| nfs_retry_commit(&pages, freeme, cinfo, i); |
| pnfs_put_lseg(freeme); |
| spin_lock(cinfo->lock); |
| } |
| spin_unlock(cinfo->lock); |
| } |
| |
| 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; |
| list_add(&data->pages, list); |
| nreq++; |
| } |
| |
| /* Clean up on error */ |
| pnfs_generic_retry_commit(cinfo, i); |
| return nreq; |
| } |
| |
| static inline |
| void pnfs_fetch_commit_bucket_list(struct list_head *pages, |
| struct nfs_commit_data *data, |
| struct nfs_commit_info *cinfo) |
| { |
| struct pnfs_commit_bucket *bucket; |
| |
| bucket = &cinfo->ds->buckets[data->ds_commit_index]; |
| spin_lock(cinfo->lock); |
| list_splice_init(pages, &bucket->committing); |
| data->lseg = bucket->clseg; |
| bucket->clseg = NULL; |
| spin_unlock(cinfo->lock); |
| |
| } |
| |
| /* Helper function for pnfs_generic_commit_pagelist to catch an empty |
| * page list. This can happen when two commits race. |
| * |
| * This must be called instead of nfs_init_commit - call one or the other, but |
| * not both! |
| */ |
| static bool |
| pnfs_generic_commit_cancel_empty_pagelist(struct list_head *pages, |
| struct nfs_commit_data *data, |
| struct nfs_commit_info *cinfo) |
| { |
| if (list_empty(pages)) { |
| if (atomic_dec_and_test(&cinfo->mds->rpcs_out)) |
| wake_up_atomic_t(&cinfo->mds->rpcs_out); |
| /* don't call nfs_commitdata_release - it tries to put |
| * the open_context which is not acquired until nfs_init_commit |
| * which has not been called on @data */ |
| WARN_ON_ONCE(data->context); |
| nfs_commit_free(data); |
| return true; |
| } |
| |
| return false; |
| } |
| |
| /* 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->ds_commit_index = -1; |
| 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->ds_commit_index < 0) { |
| /* another commit raced with us */ |
| if (pnfs_generic_commit_cancel_empty_pagelist(mds_pages, |
| data, cinfo)) |
| continue; |
| |
| 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 { |
| LIST_HEAD(pages); |
| |
| pnfs_fetch_commit_bucket_list(&pages, data, cinfo); |
| |
| /* another commit raced with us */ |
| if (pnfs_generic_commit_cancel_empty_pagelist(&pages, |
| data, cinfo)) |
| continue; |
| |
| nfs_init_commit(data, &pages, 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; |
| } |
| |
| /* |
| * Checks if 'dsaddrs1' contains a subset of 'dsaddrs2'. If it does, |
| * declare a match. |
| */ |
| static bool |
| _same_data_server_addrs_locked(const struct list_head *dsaddrs1, |
| const struct list_head *dsaddrs2) |
| { |
| struct nfs4_pnfs_ds_addr *da1, *da2; |
| struct sockaddr *sa1, *sa2; |
| bool match = false; |
| |
| list_for_each_entry(da1, dsaddrs1, da_node) { |
| sa1 = (struct sockaddr *)&da1->da_addr; |
| match = false; |
| list_for_each_entry(da2, dsaddrs2, da_node) { |
| sa2 = (struct sockaddr *)&da2->da_addr; |
| match = same_sockaddr(sa1, sa2); |
| if (match) |
| break; |
| } |
| if (!match) |
| break; |
| } |
| return match; |
| } |
| |
| /* |
| * 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); |
| |