2 * Common NFS I/O operations for the pnfs file based
5 * Copyright (c) 2014, Primary Data, Inc. All rights reserved.
7 * Tom Haynes <loghyr@primarydata.com>
10 #include <linux/nfs_fs.h>
11 #include <linux/nfs_page.h>
12 #include <linux/sunrpc/addr.h>
13 #include <linux/module.h>
15 #include "nfs4session.h"
19 #define NFSDBG_FACILITY NFSDBG_PNFS
21 void pnfs_generic_rw_release(void *data)
23 struct nfs_pgio_header *hdr = data;
25 nfs_put_client(hdr->ds_clp);
26 hdr->mds_ops->rpc_release(data);
28 EXPORT_SYMBOL_GPL(pnfs_generic_rw_release);
30 /* Fake up some data that will cause nfs_commit_release to retry the writes. */
31 void pnfs_generic_prepare_to_resend_writes(struct nfs_commit_data *data)
33 struct nfs_page *first = nfs_list_entry(data->pages.next);
35 data->task.tk_status = 0;
36 memcpy(&data->verf.verifier, &first->wb_verf,
37 sizeof(data->verf.verifier));
38 data->verf.verifier.data[0]++; /* ensure verifier mismatch */
40 EXPORT_SYMBOL_GPL(pnfs_generic_prepare_to_resend_writes);
42 void pnfs_generic_write_commit_done(struct rpc_task *task, void *data)
44 struct nfs_commit_data *wdata = data;
46 /* Note this may cause RPC to be resent */
47 wdata->mds_ops->rpc_call_done(task, data);
49 EXPORT_SYMBOL_GPL(pnfs_generic_write_commit_done);
51 void pnfs_generic_commit_release(void *calldata)
53 struct nfs_commit_data *data = calldata;
55 data->completion_ops->completion(data);
56 pnfs_put_lseg(data->lseg);
57 nfs_put_client(data->ds_clp);
58 nfs_commitdata_release(data);
60 EXPORT_SYMBOL_GPL(pnfs_generic_commit_release);
62 /* The generic layer is about to remove the req from the commit list.
63 * If this will make the bucket empty, it will need to put the lseg reference.
64 * Note this must be called holding the inode (/cinfo) lock
67 pnfs_generic_clear_request_commit(struct nfs_page *req,
68 struct nfs_commit_info *cinfo)
70 struct pnfs_layout_segment *freeme = NULL;
72 if (!test_and_clear_bit(PG_COMMIT_TO_DS, &req->wb_flags))
74 cinfo->ds->nwritten--;
75 if (list_is_singular(&req->wb_list)) {
76 struct pnfs_commit_bucket *bucket;
78 bucket = list_first_entry(&req->wb_list,
79 struct pnfs_commit_bucket,
81 freeme = bucket->wlseg;
85 nfs_request_remove_commit_list(req, cinfo);
86 pnfs_put_lseg_locked(freeme);
88 EXPORT_SYMBOL_GPL(pnfs_generic_clear_request_commit);
91 pnfs_generic_transfer_commit_list(struct list_head *src, struct list_head *dst,
92 struct nfs_commit_info *cinfo, int max)
94 struct nfs_page *req, *tmp;
97 list_for_each_entry_safe(req, tmp, src, wb_list) {
98 if (!nfs_lock_request(req))
100 kref_get(&req->wb_kref);
101 if (cond_resched_lock(cinfo->lock))
102 list_safe_reset_next(req, tmp, wb_list);
103 nfs_request_remove_commit_list(req, cinfo);
104 clear_bit(PG_COMMIT_TO_DS, &req->wb_flags);
105 nfs_list_add_request(req, dst);
107 if ((ret == max) && !cinfo->dreq)
114 pnfs_generic_scan_ds_commit_list(struct pnfs_commit_bucket *bucket,
115 struct nfs_commit_info *cinfo,
118 struct list_head *src = &bucket->written;
119 struct list_head *dst = &bucket->committing;
122 lockdep_assert_held(cinfo->lock);
123 ret = pnfs_generic_transfer_commit_list(src, dst, cinfo, max);
125 cinfo->ds->nwritten -= ret;
126 cinfo->ds->ncommitting += ret;
127 if (bucket->clseg == NULL)
128 bucket->clseg = pnfs_get_lseg(bucket->wlseg);
129 if (list_empty(src)) {
130 pnfs_put_lseg_locked(bucket->wlseg);
131 bucket->wlseg = NULL;
137 /* Move reqs from written to committing lists, returning count
140 int pnfs_generic_scan_commit_lists(struct nfs_commit_info *cinfo,
145 lockdep_assert_held(cinfo->lock);
146 for (i = 0; i < cinfo->ds->nbuckets && max != 0; i++) {
147 cnt = pnfs_generic_scan_ds_commit_list(&cinfo->ds->buckets[i],
154 EXPORT_SYMBOL_GPL(pnfs_generic_scan_commit_lists);
156 /* Pull everything off the committing lists and dump into @dst. */
157 void pnfs_generic_recover_commit_reqs(struct list_head *dst,
158 struct nfs_commit_info *cinfo)
160 struct pnfs_commit_bucket *b;
161 struct pnfs_layout_segment *freeme;
164 lockdep_assert_held(cinfo->lock);
166 for (i = 0, b = cinfo->ds->buckets; i < cinfo->ds->nbuckets; i++, b++) {
167 if (pnfs_generic_transfer_commit_list(&b->written, dst,
171 spin_unlock(cinfo->lock);
172 pnfs_put_lseg(freeme);
173 spin_lock(cinfo->lock);
177 cinfo->ds->nwritten = 0;
179 EXPORT_SYMBOL_GPL(pnfs_generic_recover_commit_reqs);
181 static void pnfs_generic_retry_commit(struct nfs_commit_info *cinfo, int idx)
183 struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds;
184 struct pnfs_commit_bucket *bucket;
185 struct pnfs_layout_segment *freeme;
189 spin_lock(cinfo->lock);
190 for (i = idx; i < fl_cinfo->nbuckets; i++) {
191 bucket = &fl_cinfo->buckets[i];
192 if (list_empty(&bucket->committing))
194 freeme = bucket->clseg;
195 bucket->clseg = NULL;
196 list_splice_init(&bucket->committing, &pages);
197 spin_unlock(cinfo->lock);
198 nfs_retry_commit(&pages, freeme, cinfo, i);
199 pnfs_put_lseg(freeme);
200 spin_lock(cinfo->lock);
202 spin_unlock(cinfo->lock);
206 pnfs_generic_alloc_ds_commits(struct nfs_commit_info *cinfo,
207 struct list_head *list)
209 struct pnfs_ds_commit_info *fl_cinfo;
210 struct pnfs_commit_bucket *bucket;
211 struct nfs_commit_data *data;
213 unsigned int nreq = 0;
215 fl_cinfo = cinfo->ds;
216 bucket = fl_cinfo->buckets;
217 for (i = 0; i < fl_cinfo->nbuckets; i++, bucket++) {
218 if (list_empty(&bucket->committing))
220 data = nfs_commitdata_alloc();
223 data->ds_commit_index = i;
224 list_add(&data->pages, list);
228 /* Clean up on error */
229 pnfs_generic_retry_commit(cinfo, i);
234 void pnfs_fetch_commit_bucket_list(struct list_head *pages,
235 struct nfs_commit_data *data,
236 struct nfs_commit_info *cinfo)
238 struct pnfs_commit_bucket *bucket;
240 bucket = &cinfo->ds->buckets[data->ds_commit_index];
241 spin_lock(cinfo->lock);
242 list_splice_init(&bucket->committing, pages);
243 data->lseg = bucket->clseg;
244 bucket->clseg = NULL;
245 spin_unlock(cinfo->lock);
249 /* This follows nfs_commit_list pretty closely */
251 pnfs_generic_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
252 int how, struct nfs_commit_info *cinfo,
253 int (*initiate_commit)(struct nfs_commit_data *data,
256 struct nfs_commit_data *data, *tmp;
258 unsigned int nreq = 0;
260 if (!list_empty(mds_pages)) {
261 data = nfs_commitdata_alloc();
263 data->ds_commit_index = -1;
264 list_add(&data->pages, &list);
267 nfs_retry_commit(mds_pages, NULL, cinfo, 0);
268 pnfs_generic_retry_commit(cinfo, 0);
269 cinfo->completion_ops->error_cleanup(NFS_I(inode));
274 nreq += pnfs_generic_alloc_ds_commits(cinfo, &list);
277 cinfo->completion_ops->error_cleanup(NFS_I(inode));
281 atomic_add(nreq, &cinfo->mds->rpcs_out);
283 list_for_each_entry_safe(data, tmp, &list, pages) {
284 list_del_init(&data->pages);
285 if (data->ds_commit_index < 0) {
286 nfs_init_commit(data, mds_pages, NULL, cinfo);
287 nfs_initiate_commit(NFS_CLIENT(inode), data,
288 NFS_PROTO(data->inode),
289 data->mds_ops, how, 0);
293 pnfs_fetch_commit_bucket_list(&pages, data, cinfo);
294 nfs_init_commit(data, &pages, data->lseg, cinfo);
295 initiate_commit(data, how);
299 cinfo->ds->ncommitting = 0;
300 return PNFS_ATTEMPTED;
302 EXPORT_SYMBOL_GPL(pnfs_generic_commit_pagelist);
307 * Data servers can be mapped to different device ids.
308 * nfs4_pnfs_ds reference counting
309 * - set to 1 on allocation
310 * - incremented when a device id maps a data server already in the cache.
311 * - decremented when deviceid is removed from the cache.
313 static DEFINE_SPINLOCK(nfs4_ds_cache_lock);
314 static LIST_HEAD(nfs4_data_server_cache);
318 print_ds(struct nfs4_pnfs_ds *ds)
321 printk(KERN_WARNING "%s NULL device\n", __func__);
324 printk(KERN_WARNING " ds %s\n"
327 " cl_exchange_flags %x\n",
329 atomic_read(&ds->ds_count), ds->ds_clp,
330 ds->ds_clp ? ds->ds_clp->cl_exchange_flags : 0);
334 same_sockaddr(struct sockaddr *addr1, struct sockaddr *addr2)
336 struct sockaddr_in *a, *b;
337 struct sockaddr_in6 *a6, *b6;
339 if (addr1->sa_family != addr2->sa_family)
342 switch (addr1->sa_family) {
344 a = (struct sockaddr_in *)addr1;
345 b = (struct sockaddr_in *)addr2;
347 if (a->sin_addr.s_addr == b->sin_addr.s_addr &&
348 a->sin_port == b->sin_port)
353 a6 = (struct sockaddr_in6 *)addr1;
354 b6 = (struct sockaddr_in6 *)addr2;
356 /* LINKLOCAL addresses must have matching scope_id */
357 if (ipv6_addr_src_scope(&a6->sin6_addr) ==
358 IPV6_ADDR_SCOPE_LINKLOCAL &&
359 a6->sin6_scope_id != b6->sin6_scope_id)
362 if (ipv6_addr_equal(&a6->sin6_addr, &b6->sin6_addr) &&
363 a6->sin6_port == b6->sin6_port)
368 dprintk("%s: unhandled address family: %u\n",
369 __func__, addr1->sa_family);
377 * Checks if 'dsaddrs1' contains a subset of 'dsaddrs2'. If it does,
381 _same_data_server_addrs_locked(const struct list_head *dsaddrs1,
382 const struct list_head *dsaddrs2)
384 struct nfs4_pnfs_ds_addr *da1, *da2;
385 struct sockaddr *sa1, *sa2;
388 list_for_each_entry(da1, dsaddrs1, da_node) {
389 sa1 = (struct sockaddr *)&da1->da_addr;
391 list_for_each_entry(da2, dsaddrs2, da_node) {
392 sa2 = (struct sockaddr *)&da2->da_addr;
393 match = same_sockaddr(sa1, sa2);
404 * Lookup DS by addresses. nfs4_ds_cache_lock is held
406 static struct nfs4_pnfs_ds *
407 _data_server_lookup_locked(const struct list_head *dsaddrs)
409 struct nfs4_pnfs_ds *ds;
411 list_for_each_entry(ds, &nfs4_data_server_cache, ds_node)
412 if (_same_data_server_addrs_locked(&ds->ds_addrs, dsaddrs))
417 static void destroy_ds(struct nfs4_pnfs_ds *ds)
419 struct nfs4_pnfs_ds_addr *da;
421 dprintk("--> %s\n", __func__);
425 nfs_put_client(ds->ds_clp);
427 while (!list_empty(&ds->ds_addrs)) {
428 da = list_first_entry(&ds->ds_addrs,
429 struct nfs4_pnfs_ds_addr,
431 list_del_init(&da->da_node);
432 kfree(da->da_remotestr);
436 kfree(ds->ds_remotestr);
440 void nfs4_pnfs_ds_put(struct nfs4_pnfs_ds *ds)
442 if (atomic_dec_and_lock(&ds->ds_count,
443 &nfs4_ds_cache_lock)) {
444 list_del_init(&ds->ds_node);
445 spin_unlock(&nfs4_ds_cache_lock);
449 EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_put);
452 * Create a string with a human readable address and port to avoid
453 * complicated setup around many dprinks.
456 nfs4_pnfs_remotestr(struct list_head *dsaddrs, gfp_t gfp_flags)
458 struct nfs4_pnfs_ds_addr *da;
463 len = 3; /* '{', '}' and eol */
464 list_for_each_entry(da, dsaddrs, da_node) {
465 len += strlen(da->da_remotestr) + 1; /* string plus comma */
468 remotestr = kzalloc(len, gfp_flags);
475 list_for_each_entry(da, dsaddrs, da_node) {
476 size_t ll = strlen(da->da_remotestr);
481 memcpy(p, da->da_remotestr, ll);
501 * Given a list of multipath struct nfs4_pnfs_ds_addr, add it to ds cache if
502 * uncached and return cached struct nfs4_pnfs_ds.
504 struct nfs4_pnfs_ds *
505 nfs4_pnfs_ds_add(struct list_head *dsaddrs, gfp_t gfp_flags)
507 struct nfs4_pnfs_ds *tmp_ds, *ds = NULL;
510 if (list_empty(dsaddrs)) {
511 dprintk("%s: no addresses defined\n", __func__);
515 ds = kzalloc(sizeof(*ds), gfp_flags);
519 /* this is only used for debugging, so it's ok if its NULL */
520 remotestr = nfs4_pnfs_remotestr(dsaddrs, gfp_flags);
522 spin_lock(&nfs4_ds_cache_lock);
523 tmp_ds = _data_server_lookup_locked(dsaddrs);
524 if (tmp_ds == NULL) {
525 INIT_LIST_HEAD(&ds->ds_addrs);
526 list_splice_init(dsaddrs, &ds->ds_addrs);
527 ds->ds_remotestr = remotestr;
528 atomic_set(&ds->ds_count, 1);
529 INIT_LIST_HEAD(&ds->ds_node);
531 list_add(&ds->ds_node, &nfs4_data_server_cache);
532 dprintk("%s add new data server %s\n", __func__,
537 atomic_inc(&tmp_ds->ds_count);
538 dprintk("%s data server %s found, inc'ed ds_count to %d\n",
539 __func__, tmp_ds->ds_remotestr,
540 atomic_read(&tmp_ds->ds_count));
543 spin_unlock(&nfs4_ds_cache_lock);
547 EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_add);
549 static void nfs4_wait_ds_connect(struct nfs4_pnfs_ds *ds)
552 wait_on_bit(&ds->ds_state, NFS4DS_CONNECTING,
556 static void nfs4_clear_ds_conn_bit(struct nfs4_pnfs_ds *ds)
558 smp_mb__before_atomic();
559 clear_bit(NFS4DS_CONNECTING, &ds->ds_state);
560 smp_mb__after_atomic();
561 wake_up_bit(&ds->ds_state, NFS4DS_CONNECTING);
564 static struct nfs_client *(*get_v3_ds_connect)(
565 struct nfs_client *mds_clp,
566 const struct sockaddr *ds_addr,
569 unsigned int ds_timeo,
570 unsigned int ds_retrans,
571 rpc_authflavor_t au_flavor);
573 static bool load_v3_ds_connect(void)
575 if (!get_v3_ds_connect) {
576 get_v3_ds_connect = symbol_request(nfs3_set_ds_client);
577 WARN_ON_ONCE(!get_v3_ds_connect);
580 return(get_v3_ds_connect != NULL);
583 void nfs4_pnfs_v3_ds_connect_unload(void)
585 if (get_v3_ds_connect) {
586 symbol_put(nfs3_set_ds_client);
587 get_v3_ds_connect = NULL;
590 EXPORT_SYMBOL_GPL(nfs4_pnfs_v3_ds_connect_unload);
592 static int _nfs4_pnfs_v3_ds_connect(struct nfs_server *mds_srv,
593 struct nfs4_pnfs_ds *ds,
595 unsigned int retrans,
596 rpc_authflavor_t au_flavor)
598 struct nfs_client *clp = ERR_PTR(-EIO);
599 struct nfs4_pnfs_ds_addr *da;
602 dprintk("--> %s DS %s au_flavor %d\n", __func__,
603 ds->ds_remotestr, au_flavor);
605 if (!load_v3_ds_connect())
608 list_for_each_entry(da, &ds->ds_addrs, da_node) {
609 dprintk("%s: DS %s: trying address %s\n",
610 __func__, ds->ds_remotestr, da->da_remotestr);
612 clp = get_v3_ds_connect(mds_srv->nfs_client,
613 (struct sockaddr *)&da->da_addr,
614 da->da_addrlen, IPPROTO_TCP,
615 timeo, retrans, au_flavor);
621 status = PTR_ERR(clp);
627 dprintk("%s [new] addr: %s\n", __func__, ds->ds_remotestr);
632 static int _nfs4_pnfs_v4_ds_connect(struct nfs_server *mds_srv,
633 struct nfs4_pnfs_ds *ds,
635 unsigned int retrans,
637 rpc_authflavor_t au_flavor)
639 struct nfs_client *clp = ERR_PTR(-EIO);
640 struct nfs4_pnfs_ds_addr *da;
643 dprintk("--> %s DS %s au_flavor %d\n", __func__, ds->ds_remotestr,
646 list_for_each_entry(da, &ds->ds_addrs, da_node) {
647 dprintk("%s: DS %s: trying address %s\n",
648 __func__, ds->ds_remotestr, da->da_remotestr);
650 clp = nfs4_set_ds_client(mds_srv->nfs_client,
651 (struct sockaddr *)&da->da_addr,
652 da->da_addrlen, IPPROTO_TCP,
653 timeo, retrans, minor_version,
660 status = PTR_ERR(clp);
664 status = nfs4_init_ds_session(clp, mds_srv->nfs_client->cl_lease_time);
670 dprintk("%s [new] addr: %s\n", __func__, ds->ds_remotestr);
679 * Create an rpc connection to the nfs4_pnfs_ds data server.
680 * Currently only supports IPv4 and IPv6 addresses.
681 * If connection fails, make devid unavailable.
683 void nfs4_pnfs_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds,
684 struct nfs4_deviceid_node *devid, unsigned int timeo,
685 unsigned int retrans, u32 version,
686 u32 minor_version, rpc_authflavor_t au_flavor)
688 if (test_and_set_bit(NFS4DS_CONNECTING, &ds->ds_state) == 0) {
692 err = _nfs4_pnfs_v3_ds_connect(mds_srv, ds, timeo,
694 } else if (version == 4) {
695 err = _nfs4_pnfs_v4_ds_connect(mds_srv, ds, timeo,
696 retrans, minor_version,
699 dprintk("%s: unsupported DS version %d\n", __func__,
701 err = -EPROTONOSUPPORT;
705 nfs4_mark_deviceid_unavailable(devid);
706 nfs4_clear_ds_conn_bit(ds);
708 nfs4_wait_ds_connect(ds);
711 EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_connect);
714 * Currently only supports ipv4, ipv6 and one multi-path address.
716 struct nfs4_pnfs_ds_addr *
717 nfs4_decode_mp_ds_addr(struct net *net, struct xdr_stream *xdr, gfp_t gfp_flags)
719 struct nfs4_pnfs_ds_addr *da = NULL;
725 char *netid, *match_netid;
726 size_t len, match_netid_len;
732 p = xdr_inline_decode(xdr, 4);
735 nlen = be32_to_cpup(p++);
737 p = xdr_inline_decode(xdr, nlen);
741 netid = kmalloc(nlen+1, gfp_flags);
742 if (unlikely(!netid))
746 memcpy(netid, p, nlen);
748 /* r_addr: ip/ip6addr with port in dec octets - see RFC 5665 */
749 p = xdr_inline_decode(xdr, 4);
752 rlen = be32_to_cpup(p);
754 p = xdr_inline_decode(xdr, rlen);
758 /* port is ".ABC.DEF", 8 chars max */
759 if (rlen > INET6_ADDRSTRLEN + IPV6_SCOPE_ID_LEN + 8) {
760 dprintk("%s: Invalid address, length %d\n", __func__,
764 buf = kmalloc(rlen + 1, gfp_flags);
766 dprintk("%s: Not enough memory\n", __func__);
770 memcpy(buf, p, rlen);
772 /* replace port '.' with '-' */
773 portstr = strrchr(buf, '.');
775 dprintk("%s: Failed finding expected dot in port\n",
781 /* find '.' between address and port */
782 portstr = strrchr(buf, '.');
784 dprintk("%s: Failed finding expected dot between address and "
790 da = kzalloc(sizeof(*da), gfp_flags);
794 INIT_LIST_HEAD(&da->da_node);
796 if (!rpc_pton(net, buf, portstr-buf, (struct sockaddr *)&da->da_addr,
797 sizeof(da->da_addr))) {
798 dprintk("%s: error parsing address %s\n", __func__, buf);
803 sscanf(portstr, "%d-%d", &tmp[0], &tmp[1]);
804 port = htons((tmp[0] << 8) | (tmp[1]));
806 switch (da->da_addr.ss_family) {
808 ((struct sockaddr_in *)&da->da_addr)->sin_port = port;
809 da->da_addrlen = sizeof(struct sockaddr_in);
815 ((struct sockaddr_in6 *)&da->da_addr)->sin6_port = port;
816 da->da_addrlen = sizeof(struct sockaddr_in6);
817 match_netid = "tcp6";
824 dprintk("%s: unsupported address family: %u\n",
825 __func__, da->da_addr.ss_family);
829 if (nlen != match_netid_len || strncmp(netid, match_netid, nlen)) {
830 dprintk("%s: ERROR: r_netid \"%s\" != \"%s\"\n",
831 __func__, netid, match_netid);
835 /* save human readable address */
836 len = strlen(startsep) + strlen(buf) + strlen(endsep) + 7;
837 da->da_remotestr = kzalloc(len, gfp_flags);
839 /* NULL is ok, only used for dprintk */
840 if (da->da_remotestr)
841 snprintf(da->da_remotestr, len, "%s%s%s:%u", startsep,
842 buf, endsep, ntohs(port));
844 dprintk("%s: Parsed DS addr %s\n", __func__, da->da_remotestr);
852 dprintk("%s: Error parsing DS addr: %s\n", __func__, buf);
859 EXPORT_SYMBOL_GPL(nfs4_decode_mp_ds_addr);
862 pnfs_layout_mark_request_commit(struct nfs_page *req,
863 struct pnfs_layout_segment *lseg,
864 struct nfs_commit_info *cinfo,
867 struct list_head *list;
868 struct pnfs_commit_bucket *buckets;
870 spin_lock(cinfo->lock);
871 buckets = cinfo->ds->buckets;
872 list = &buckets[ds_commit_idx].written;
873 if (list_empty(list)) {
874 /* Non-empty buckets hold a reference on the lseg. That ref
875 * is normally transferred to the COMMIT call and released
876 * there. It could also be released if the last req is pulled
877 * off due to a rewrite, in which case it will be done in
878 * pnfs_common_clear_request_commit
880 WARN_ON_ONCE(buckets[ds_commit_idx].wlseg != NULL);
881 buckets[ds_commit_idx].wlseg = pnfs_get_lseg(lseg);
883 set_bit(PG_COMMIT_TO_DS, &req->wb_flags);
884 cinfo->ds->nwritten++;
886 nfs_request_add_commit_list_locked(req, list, cinfo);
887 spin_unlock(cinfo->lock);
888 nfs_mark_page_unstable(req->wb_page, cinfo);
890 EXPORT_SYMBOL_GPL(pnfs_layout_mark_request_commit);
893 pnfs_nfs_generic_sync(struct inode *inode, bool datasync)
897 return pnfs_layoutcommit_inode(inode, true);
899 EXPORT_SYMBOL_GPL(pnfs_nfs_generic_sync);