diff options
Diffstat (limited to 'fs/nfs/pnfs_nfs.c')
| -rw-r--r-- | fs/nfs/pnfs_nfs.c | 1215 |
1 files changed, 1215 insertions, 0 deletions
diff --git a/fs/nfs/pnfs_nfs.c b/fs/nfs/pnfs_nfs.c new file mode 100644 index 000000000..a2ad8bb87 --- /dev/null +++ b/fs/nfs/pnfs_nfs.c @@ -0,0 +1,1215 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * 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_writeverf *verf = data->res.verf; + + data->task.tk_status = 0; + memset(&verf->verifier, 0, sizeof(verf->verifier)); + verf->committed = NFS_UNSTABLE; +} +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); + +static struct pnfs_layout_segment * +pnfs_free_bucket_lseg(struct pnfs_commit_bucket *bucket) +{ + if (list_empty(&bucket->committing) && list_empty(&bucket->written)) { + struct pnfs_layout_segment *freeme = bucket->lseg; + bucket->lseg = NULL; + return freeme; + } + return NULL; +} + +/* 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 nfsi->commit_mutex + */ +void +pnfs_generic_clear_request_commit(struct nfs_page *req, + struct nfs_commit_info *cinfo) +{ + struct pnfs_commit_bucket *bucket = 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)) + bucket = list_first_entry(&req->wb_list, + struct pnfs_commit_bucket, written); +out: + nfs_request_remove_commit_list(req, cinfo); + if (bucket) + pnfs_put_lseg(pnfs_free_bucket_lseg(bucket)); +} +EXPORT_SYMBOL_GPL(pnfs_generic_clear_request_commit); + +struct pnfs_commit_array * +pnfs_alloc_commit_array(size_t n, gfp_t gfp_flags) +{ + struct pnfs_commit_array *p; + struct pnfs_commit_bucket *b; + + p = kmalloc(struct_size(p, buckets, n), gfp_flags); + if (!p) + return NULL; + p->nbuckets = n; + INIT_LIST_HEAD(&p->cinfo_list); + INIT_LIST_HEAD(&p->lseg_list); + p->lseg = NULL; + for (b = &p->buckets[0]; n != 0; b++, n--) { + INIT_LIST_HEAD(&b->written); + INIT_LIST_HEAD(&b->committing); + b->lseg = NULL; + b->direct_verf.committed = NFS_INVALID_STABLE_HOW; + } + return p; +} +EXPORT_SYMBOL_GPL(pnfs_alloc_commit_array); + +void +pnfs_free_commit_array(struct pnfs_commit_array *p) +{ + kfree_rcu(p, rcu); +} +EXPORT_SYMBOL_GPL(pnfs_free_commit_array); + +static struct pnfs_commit_array * +pnfs_find_commit_array_by_lseg(struct pnfs_ds_commit_info *fl_cinfo, + struct pnfs_layout_segment *lseg) +{ + struct pnfs_commit_array *array; + + list_for_each_entry_rcu(array, &fl_cinfo->commits, cinfo_list) { + if (array->lseg == lseg) + return array; + } + return NULL; +} + +struct pnfs_commit_array * +pnfs_add_commit_array(struct pnfs_ds_commit_info *fl_cinfo, + struct pnfs_commit_array *new, + struct pnfs_layout_segment *lseg) +{ + struct pnfs_commit_array *array; + + array = pnfs_find_commit_array_by_lseg(fl_cinfo, lseg); + if (array) + return array; + new->lseg = lseg; + refcount_set(&new->refcount, 1); + list_add_rcu(&new->cinfo_list, &fl_cinfo->commits); + list_add(&new->lseg_list, &lseg->pls_commits); + return new; +} +EXPORT_SYMBOL_GPL(pnfs_add_commit_array); + +static struct pnfs_commit_array * +pnfs_lookup_commit_array(struct pnfs_ds_commit_info *fl_cinfo, + struct pnfs_layout_segment *lseg) +{ + struct pnfs_commit_array *array; + + rcu_read_lock(); + array = pnfs_find_commit_array_by_lseg(fl_cinfo, lseg); + if (!array) { + rcu_read_unlock(); + fl_cinfo->ops->setup_ds_info(fl_cinfo, lseg); + rcu_read_lock(); + array = pnfs_find_commit_array_by_lseg(fl_cinfo, lseg); + } + rcu_read_unlock(); + return array; +} + +static void +pnfs_release_commit_array_locked(struct pnfs_commit_array *array) +{ + list_del_rcu(&array->cinfo_list); + list_del(&array->lseg_list); + pnfs_free_commit_array(array); +} + +static void +pnfs_put_commit_array_locked(struct pnfs_commit_array *array) +{ + if (refcount_dec_and_test(&array->refcount)) + pnfs_release_commit_array_locked(array); +} + +static void +pnfs_put_commit_array(struct pnfs_commit_array *array, struct inode *inode) +{ + if (refcount_dec_and_lock(&array->refcount, &inode->i_lock)) { + pnfs_release_commit_array_locked(array); + spin_unlock(&inode->i_lock); + } +} + +static struct pnfs_commit_array * +pnfs_get_commit_array(struct pnfs_commit_array *array) +{ + if (refcount_inc_not_zero(&array->refcount)) + return array; + return NULL; +} + +static void +pnfs_remove_and_free_commit_array(struct pnfs_commit_array *array) +{ + array->lseg = NULL; + list_del_init(&array->lseg_list); + pnfs_put_commit_array_locked(array); +} + +void +pnfs_generic_ds_cinfo_release_lseg(struct pnfs_ds_commit_info *fl_cinfo, + struct pnfs_layout_segment *lseg) +{ + struct pnfs_commit_array *array, *tmp; + + list_for_each_entry_safe(array, tmp, &lseg->pls_commits, lseg_list) + pnfs_remove_and_free_commit_array(array); +} +EXPORT_SYMBOL_GPL(pnfs_generic_ds_cinfo_release_lseg); + +void +pnfs_generic_ds_cinfo_destroy(struct pnfs_ds_commit_info *fl_cinfo) +{ + struct pnfs_commit_array *array, *tmp; + + list_for_each_entry_safe(array, tmp, &fl_cinfo->commits, cinfo_list) + pnfs_remove_and_free_commit_array(array); +} +EXPORT_SYMBOL_GPL(pnfs_generic_ds_cinfo_destroy); + +/* + * Locks the nfs_page requests for commit and moves them to + * @bucket->committing. + */ +static int +pnfs_bucket_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(&NFS_I(cinfo->inode)->commit_mutex); + ret = nfs_scan_commit_list(src, dst, cinfo, max); + if (ret) { + cinfo->ds->nwritten -= ret; + cinfo->ds->ncommitting += ret; + } + return ret; +} + +static int pnfs_bucket_scan_array(struct nfs_commit_info *cinfo, + struct pnfs_commit_bucket *buckets, + unsigned int nbuckets, + int max) +{ + unsigned int i; + int rv = 0, cnt; + + for (i = 0; i < nbuckets && max != 0; i++) { + cnt = pnfs_bucket_scan_ds_commit_list(&buckets[i], cinfo, max); + rv += cnt; + max -= cnt; + } + return rv; +} + +/* 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) +{ + struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds; + struct pnfs_commit_array *array; + int rv = 0, cnt; + + rcu_read_lock(); + list_for_each_entry_rcu(array, &fl_cinfo->commits, cinfo_list) { + if (!array->lseg || !pnfs_get_commit_array(array)) + continue; + rcu_read_unlock(); + cnt = pnfs_bucket_scan_array(cinfo, array->buckets, + array->nbuckets, max); + rcu_read_lock(); + pnfs_put_commit_array(array, cinfo->inode); + rv += cnt; + max -= cnt; + if (!max) + break; + } + rcu_read_unlock(); + return rv; +} +EXPORT_SYMBOL_GPL(pnfs_generic_scan_commit_lists); + +static unsigned int +pnfs_bucket_recover_commit_reqs(struct list_head *dst, + struct pnfs_commit_bucket *buckets, + unsigned int nbuckets, + struct nfs_commit_info *cinfo) +{ + struct pnfs_commit_bucket *b; + struct pnfs_layout_segment *freeme; + unsigned int nwritten, ret = 0; + unsigned int i; + +restart: + for (i = 0, b = buckets; i < nbuckets; i++, b++) { + nwritten = nfs_scan_commit_list(&b->written, dst, cinfo, 0); + if (!nwritten) + continue; + ret += nwritten; + freeme = pnfs_free_bucket_lseg(b); + if (freeme) { + pnfs_put_lseg(freeme); + goto restart; + } + } + return ret; +} + +/* 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_ds_commit_info *fl_cinfo = cinfo->ds; + struct pnfs_commit_array *array; + unsigned int nwritten; + + lockdep_assert_held(&NFS_I(cinfo->inode)->commit_mutex); + rcu_read_lock(); + list_for_each_entry_rcu(array, &fl_cinfo->commits, cinfo_list) { + if (!array->lseg || !pnfs_get_commit_array(array)) + continue; + rcu_read_unlock(); + nwritten = pnfs_bucket_recover_commit_reqs(dst, + array->buckets, + array->nbuckets, + cinfo); + rcu_read_lock(); + pnfs_put_commit_array(array, cinfo->inode); + fl_cinfo->nwritten -= nwritten; + } + rcu_read_unlock(); +} +EXPORT_SYMBOL_GPL(pnfs_generic_recover_commit_reqs); + +static struct nfs_page * +pnfs_bucket_search_commit_reqs(struct pnfs_commit_bucket *buckets, + unsigned int nbuckets, struct page *page) +{ + struct nfs_page *req; + struct pnfs_commit_bucket *b; + unsigned int i; + + /* Linearly search the commit lists for each bucket until a matching + * request is found */ + for (i = 0, b = buckets; i < nbuckets; i++, b++) { + list_for_each_entry(req, &b->written, wb_list) { + if (req->wb_page == page) + return req->wb_head; + } + list_for_each_entry(req, &b->committing, wb_list) { + if (req->wb_page == page) + return req->wb_head; + } + } + return NULL; +} + +/* pnfs_generic_search_commit_reqs - Search lists in @cinfo for the head reqest + * for @page + * @cinfo - commit info for current inode + * @page - page to search for matching head request + * + * Returns a the head request if one is found, otherwise returns NULL. + */ +struct nfs_page * +pnfs_generic_search_commit_reqs(struct nfs_commit_info *cinfo, struct page *page) +{ + struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds; + struct pnfs_commit_array *array; + struct nfs_page *req; + + list_for_each_entry(array, &fl_cinfo->commits, cinfo_list) { + req = pnfs_bucket_search_commit_reqs(array->buckets, + array->nbuckets, page); + if (req) + return req; + } + return NULL; +} +EXPORT_SYMBOL_GPL(pnfs_generic_search_commit_reqs); + +static struct pnfs_layout_segment * +pnfs_bucket_get_committing(struct list_head *head, + struct pnfs_commit_bucket *bucket, + struct nfs_commit_info *cinfo) +{ + struct pnfs_layout_segment *lseg; + struct list_head *pos; + + list_for_each(pos, &bucket->committing) + cinfo->ds->ncommitting--; + list_splice_init(&bucket->committing, head); + lseg = pnfs_free_bucket_lseg(bucket); + if (!lseg) + lseg = pnfs_get_lseg(bucket->lseg); + return lseg; +} + +static struct nfs_commit_data * +pnfs_bucket_fetch_commitdata(struct pnfs_commit_bucket *bucket, + struct nfs_commit_info *cinfo) +{ + struct nfs_commit_data *data = nfs_commitdata_alloc(); + + if (!data) + return NULL; + data->lseg = pnfs_bucket_get_committing(&data->pages, bucket, cinfo); + return data; +} + +static void pnfs_generic_retry_commit(struct pnfs_commit_bucket *buckets, + unsigned int nbuckets, + struct nfs_commit_info *cinfo, + unsigned int idx) +{ + struct pnfs_commit_bucket *bucket; + struct pnfs_layout_segment *freeme; + LIST_HEAD(pages); + + for (bucket = buckets; idx < nbuckets; bucket++, idx++) { + if (list_empty(&bucket->committing)) + continue; + mutex_lock(&NFS_I(cinfo->inode)->commit_mutex); + freeme = pnfs_bucket_get_committing(&pages, bucket, cinfo); + mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex); + nfs_retry_commit(&pages, freeme, cinfo, idx); + pnfs_put_lseg(freeme); + } +} + +static unsigned int +pnfs_bucket_alloc_ds_commits(struct list_head *list, + struct pnfs_commit_bucket *buckets, + unsigned int nbuckets, + struct nfs_commit_info *cinfo) +{ + struct pnfs_commit_bucket *bucket; + struct nfs_commit_data *data; + unsigned int i; + unsigned int nreq = 0; + + for (i = 0, bucket = buckets; i < nbuckets; i++, bucket++) { + if (list_empty(&bucket->committing)) + continue; + mutex_lock(&NFS_I(cinfo->inode)->commit_mutex); + if (!list_empty(&bucket->committing)) { + data = pnfs_bucket_fetch_commitdata(bucket, cinfo); + if (!data) + goto out_error; + data->ds_commit_index = i; + list_add_tail(&data->list, list); + nreq++; + } + mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex); + } + return nreq; +out_error: + mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex); + /* Clean up on error */ + pnfs_generic_retry_commit(buckets, nbuckets, cinfo, i); + return nreq; +} + +static unsigned int +pnfs_alloc_ds_commits_list(struct list_head *list, + struct pnfs_ds_commit_info *fl_cinfo, + struct nfs_commit_info *cinfo) +{ + struct pnfs_commit_array *array; + unsigned int ret = 0; + + rcu_read_lock(); + list_for_each_entry_rcu(array, &fl_cinfo->commits, cinfo_list) { + if (!array->lseg || !pnfs_get_commit_array(array)) + continue; + rcu_read_unlock(); + ret += pnfs_bucket_alloc_ds_commits(list, array->buckets, + array->nbuckets, cinfo); + rcu_read_lock(); + pnfs_put_commit_array(array, cinfo->inode); + } + rcu_read_unlock(); + return ret; +} + +/* 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 pnfs_ds_commit_info *fl_cinfo = cinfo->ds; + struct nfs_commit_data *data, *tmp; + LIST_HEAD(list); + unsigned int nreq = 0; + + if (!list_empty(mds_pages)) { + data = nfs_commitdata_alloc(); + if (!data) { + nfs_retry_commit(mds_pages, NULL, cinfo, -1); + return -ENOMEM; + } + data->ds_commit_index = -1; + list_splice_init(mds_pages, &data->pages); + list_add_tail(&data->list, &list); + nreq++; + } + + nreq += pnfs_alloc_ds_commits_list(&list, fl_cinfo, cinfo); + if (nreq == 0) + goto out; + + list_for_each_entry_safe(data, tmp, &list, list) { + list_del(&data->list); + if (data->ds_commit_index < 0) { + nfs_init_commit(data, NULL, NULL, cinfo); + nfs_initiate_commit(NFS_CLIENT(inode), data, + NFS_PROTO(data->inode), + data->mds_ops, how, + RPC_TASK_CRED_NOREF); + } else { + nfs_init_commit(data, NULL, data->lseg, cinfo); + initiate_commit(data, how); + } + } +out: + 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, + refcount_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 (refcount_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; + refcount_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); + refcount_inc(&tmp_ds->ds_count); + dprintk("%s data server %s found, inc'ed ds_count to %d\n", + __func__, tmp_ds->ds_remotestr, + refcount_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 int nfs4_wait_ds_connect(struct nfs4_pnfs_ds *ds) +{ + might_sleep(); + return 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_and_wake_up_bit(NFS4DS_CONNECTING, &ds->ds_state); +} + +static struct nfs_client *(*get_v3_ds_connect)( + struct nfs_server *mds_srv, + const struct sockaddr *ds_addr, + int ds_addrlen, + int ds_proto, + unsigned int ds_timeo, + unsigned int ds_retrans); + +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; + } +} + +static int _nfs4_pnfs_v3_ds_connect(struct nfs_server *mds_srv, + struct nfs4_pnfs_ds *ds, + unsigned int timeo, + unsigned int retrans) +{ + struct nfs_client *clp = ERR_PTR(-EIO); + struct nfs4_pnfs_ds_addr *da; + int status = 0; + + dprintk("--> %s DS %s\n", __func__, ds->ds_remotestr); + + 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); + + if (!IS_ERR(clp)) { + struct xprt_create xprt_args = { + .ident = XPRT_TRANSPORT_TCP, + .net = clp->cl_net, + .dstaddr = (struct sockaddr *)&da->da_addr, + .addrlen = da->da_addrlen, + .servername = clp->cl_hostname, + }; + /* Add this address as an alias */ + rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args, + rpc_clnt_test_and_add_xprt, NULL); + continue; + } + clp = get_v3_ds_connect(mds_srv, + (struct sockaddr *)&da->da_addr, + da->da_addrlen, IPPROTO_TCP, + timeo, retrans); + if (IS_ERR(clp)) + continue; + clp->cl_rpcclient->cl_softerr = 0; + clp->cl_rpcclient->cl_softrtry = 0; + } + + if (IS_ERR(clp)) { + status = PTR_ERR(clp); + goto out; + } + + smp_wmb(); + WRITE_ONCE(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) +{ + struct nfs_client *clp = ERR_PTR(-EIO); + struct nfs4_pnfs_ds_addr *da; + int status = 0; + + dprintk("--> %s DS %s\n", __func__, ds->ds_remotestr); + + 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); + + if (!IS_ERR(clp) && clp->cl_mvops->session_trunk) { + struct xprt_create xprt_args = { + .ident = XPRT_TRANSPORT_TCP, + .net = clp->cl_net, + .dstaddr = (struct sockaddr *)&da->da_addr, + .addrlen = da->da_addrlen, + .servername = clp->cl_hostname, + }; + struct nfs4_add_xprt_data xprtdata = { + .clp = clp, + .cred = nfs4_get_clid_cred(clp), + }; + struct rpc_add_xprt_test rpcdata = { + .add_xprt_test = clp->cl_mvops->session_trunk, + .data = &xprtdata, + }; + + /** + * Test this address for session trunking and + * add as an alias + */ + rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args, + rpc_clnt_setup_test_and_add_xprt, + &rpcdata); + if (xprtdata.cred) + put_cred(xprtdata.cred); + } else { + clp = nfs4_set_ds_client(mds_srv, + (struct sockaddr *)&da->da_addr, + da->da_addrlen, IPPROTO_TCP, + timeo, retrans, minor_version); + if (IS_ERR(clp)) + continue; + + status = nfs4_init_ds_session(clp, + mds_srv->nfs_client->cl_lease_time); + if (status) { + nfs_put_client(clp); + clp = ERR_PTR(-EIO); + continue; + } + + } + } + + if (IS_ERR(clp)) { + status = PTR_ERR(clp); + goto out; + } + + smp_wmb(); + WRITE_ONCE(ds->ds_clp, clp); + dprintk("%s [new] addr: %s\n", __func__, ds->ds_remotestr); +out: + return status; +} + +/* + * Create an rpc connection to the nfs4_pnfs_ds data server. + * Currently only supports IPv4 and IPv6 addresses. + * If connection fails, make devid unavailable and return a -errno. + */ +int 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) +{ + int err; + + do { + err = nfs4_wait_ds_connect(ds); + if (err || ds->ds_clp) + goto out; + if (nfs4_test_deviceid_unavailable(devid)) + return -ENODEV; + } while (test_and_set_bit(NFS4DS_CONNECTING, &ds->ds_state) != 0); + + if (ds->ds_clp) + goto connect_done; + + switch (version) { + case 3: + err = _nfs4_pnfs_v3_ds_connect(mds_srv, ds, timeo, retrans); + break; + case 4: + err = _nfs4_pnfs_v4_ds_connect(mds_srv, ds, timeo, retrans, + minor_version); + break; + default: + dprintk("%s: unsupported DS version %d\n", __func__, version); + err = -EPROTONOSUPPORT; + } + +connect_done: + nfs4_clear_ds_conn_bit(ds); +out: + /* + * At this point the ds->ds_clp should be ready, but it might have + * hit an error. + */ + if (!err) { + if (!ds->ds_clp || !nfs_client_init_is_complete(ds->ds_clp)) { + WARN_ON_ONCE(ds->ds_clp || + !nfs4_test_deviceid_unavailable(devid)); + return -EINVAL; + } + err = nfs_client_init_status(ds->ds_clp); + } + + return err; +} +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_array *array; + struct pnfs_commit_bucket *bucket; + + mutex_lock(&NFS_I(cinfo->inode)->commit_mutex); + array = pnfs_lookup_commit_array(cinfo->ds, lseg); + if (!array || !pnfs_is_valid_lseg(lseg)) + goto out_resched; + bucket = &array->buckets[ds_commit_idx]; + list = &bucket->written; + /* 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 + */ + if (!bucket->lseg) + bucket->lseg = pnfs_get_lseg(lseg); + set_bit(PG_COMMIT_TO_DS, &req->wb_flags); + cinfo->ds->nwritten++; + + nfs_request_add_commit_list_locked(req, list, cinfo); + mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex); + nfs_mark_page_unstable(req->wb_page, cinfo); + return; +out_resched: + mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex); + cinfo->completion_ops->resched_write(cinfo, req); +} +EXPORT_SYMBOL_GPL(pnfs_layout_mark_request_commit); + +int +pnfs_nfs_generic_sync(struct inode *inode, bool datasync) +{ + int ret; + + if (!pnfs_layoutcommit_outstanding(inode)) + return 0; + ret = nfs_commit_inode(inode, FLUSH_SYNC); + if (ret < 0) + return ret; + if (datasync) + return 0; + return pnfs_layoutcommit_inode(inode, true); +} +EXPORT_SYMBOL_GPL(pnfs_nfs_generic_sync); + |