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1/*
2 * pNFS client data structures.
3 *
4 * Copyright (c) 2002
5 * The Regents of the University of Michigan
6 * All Rights Reserved
7 *
8 * Dean Hildebrand <dhildebz@umich.edu>
9 *
10 * Permission is granted to use, copy, create derivative works, and
11 * redistribute this software and such derivative works for any purpose,
12 * so long as the name of the University of Michigan is not used in
13 * any advertising or publicity pertaining to the use or distribution
14 * of this software without specific, written prior authorization. If
15 * the above copyright notice or any other identification of the
16 * University of Michigan is included in any copy of any portion of
17 * this software, then the disclaimer below must also be included.
18 *
19 * This software is provided as is, without representation or warranty
20 * of any kind either express or implied, including without limitation
21 * the implied warranties of merchantability, fitness for a particular
22 * purpose, or noninfringement. The Regents of the University of
23 * Michigan shall not be liable for any damages, including special,
24 * indirect, incidental, or consequential damages, with respect to any
25 * claim arising out of or in connection with the use of the software,
26 * even if it has been or is hereafter advised of the possibility of
27 * such damages.
28 */
29
30#ifndef FS_NFS_PNFS_H
31#define FS_NFS_PNFS_H
32
33#include <linux/refcount.h>
34#include <linux/nfs_fs.h>
35#include <linux/nfs_page.h>
36#include <linux/workqueue.h>
37
38struct nfs4_opendata;
39
40enum {
41 NFS_LSEG_VALID = 0, /* cleared when lseg is recalled/returned */
42 NFS_LSEG_ROC, /* roc bit received from server */
43 NFS_LSEG_LAYOUTCOMMIT, /* layoutcommit bit set for layoutcommit */
44 NFS_LSEG_LAYOUTRETURN, /* layoutreturn bit set for layoutreturn */
45 NFS_LSEG_UNAVAILABLE, /* unavailable bit set for temporary problem */
46};
47
48/* Individual ip address */
49struct nfs4_pnfs_ds_addr {
50 struct sockaddr_storage da_addr;
51 size_t da_addrlen;
52 struct list_head da_node; /* nfs4_pnfs_dev_hlist dev_dslist */
53 char *da_remotestr; /* human readable addr+port */
54 const char *da_netid;
55 int da_transport;
56};
57
58struct nfs4_pnfs_ds {
59 struct list_head ds_node; /* nfs4_pnfs_dev_hlist dev_dslist */
60 char *ds_remotestr; /* comma sep list of addrs */
61 struct list_head ds_addrs;
62 struct nfs_client *ds_clp;
63 refcount_t ds_count;
64 unsigned long ds_state;
65#define NFS4DS_CONNECTING 0 /* ds is establishing connection */
66};
67
68struct pnfs_layout_segment {
69 struct list_head pls_list;
70 struct list_head pls_lc_list;
71 struct list_head pls_commits;
72 struct pnfs_layout_range pls_range;
73 refcount_t pls_refcount;
74 u32 pls_seq;
75 unsigned long pls_flags;
76 struct pnfs_layout_hdr *pls_layout;
77};
78
79enum pnfs_try_status {
80 PNFS_ATTEMPTED = 0,
81 PNFS_NOT_ATTEMPTED = 1,
82 PNFS_TRY_AGAIN = 2,
83};
84
85/* error codes for internal use */
86#define NFS4ERR_RESET_TO_MDS 12001
87#define NFS4ERR_RESET_TO_PNFS 12002
88
89#ifdef CONFIG_NFS_V4_1
90
91#define LAYOUT_NFSV4_1_MODULE_PREFIX "nfs-layouttype4"
92
93/*
94 * Default data server connection timeout and retrans vaules.
95 * Set by module parameters dataserver_timeo and dataserver_retrans.
96 */
97#define NFS4_DEF_DS_TIMEO 600 /* in tenths of a second */
98#define NFS4_DEF_DS_RETRANS 5
99#define PNFS_DEVICE_RETRY_TIMEOUT (120*HZ)
100
101enum {
102 NFS_LAYOUT_RO_FAILED = 0, /* get ro layout failed stop trying */
103 NFS_LAYOUT_RW_FAILED, /* get rw layout failed stop trying */
104 NFS_LAYOUT_BULK_RECALL, /* bulk recall affecting layout */
105 NFS_LAYOUT_RETURN, /* layoutreturn in progress */
106 NFS_LAYOUT_RETURN_LOCK, /* Serialise layoutreturn */
107 NFS_LAYOUT_RETURN_REQUESTED, /* Return this layout ASAP */
108 NFS_LAYOUT_INVALID_STID, /* layout stateid id is invalid */
109 NFS_LAYOUT_FIRST_LAYOUTGET, /* Serialize first layoutget */
110 NFS_LAYOUT_INODE_FREEING, /* The inode is being freed */
111 NFS_LAYOUT_HASHED, /* The layout visible */
112};
113
114enum layoutdriver_policy_flags {
115 /* Should the pNFS client commit and return the layout upon truncate to
116 * a smaller size */
117 PNFS_LAYOUTRET_ON_SETATTR = 1 << 0,
118 PNFS_LAYOUTRET_ON_ERROR = 1 << 1,
119 PNFS_READ_WHOLE_PAGE = 1 << 2,
120 PNFS_LAYOUTGET_ON_OPEN = 1 << 3,
121};
122
123struct nfs4_deviceid_node;
124
125/* Per-layout driver specific registration structure */
126struct pnfs_layoutdriver_type {
127 struct list_head pnfs_tblid;
128 const u32 id;
129 const char *name;
130 struct module *owner;
131 unsigned flags;
132 unsigned max_deviceinfo_size;
133 unsigned max_layoutget_response;
134
135 int (*set_layoutdriver) (struct nfs_server *, const struct nfs_fh *);
136 int (*clear_layoutdriver) (struct nfs_server *);
137
138 struct pnfs_layout_hdr * (*alloc_layout_hdr) (struct inode *inode, gfp_t gfp_flags);
139 void (*free_layout_hdr) (struct pnfs_layout_hdr *);
140
141 struct pnfs_layout_segment * (*alloc_lseg) (struct pnfs_layout_hdr *layoutid, struct nfs4_layoutget_res *lgr, gfp_t gfp_flags);
142 void (*free_lseg) (struct pnfs_layout_segment *lseg);
143 void (*add_lseg) (struct pnfs_layout_hdr *layoutid,
144 struct pnfs_layout_segment *lseg,
145 struct list_head *free_me);
146
147 void (*return_range) (struct pnfs_layout_hdr *lo,
148 struct pnfs_layout_range *range);
149
150 /* test for nfs page cache coalescing */
151 const struct nfs_pageio_ops *pg_read_ops;
152 const struct nfs_pageio_ops *pg_write_ops;
153
154 struct pnfs_ds_commit_info *(*get_ds_info) (struct inode *inode);
155
156 int (*sync)(struct inode *inode, bool datasync);
157
158 /*
159 * Return PNFS_ATTEMPTED to indicate the layout code has attempted
160 * I/O, else return PNFS_NOT_ATTEMPTED to fall back to normal NFS
161 */
162 enum pnfs_try_status (*read_pagelist)(struct nfs_pgio_header *);
163 enum pnfs_try_status (*write_pagelist)(struct nfs_pgio_header *, int);
164
165 void (*free_deviceid_node) (struct nfs4_deviceid_node *);
166 struct nfs4_deviceid_node * (*alloc_deviceid_node)
167 (struct nfs_server *server, struct pnfs_device *pdev,
168 gfp_t gfp_flags);
169
170 int (*prepare_layoutreturn) (struct nfs4_layoutreturn_args *);
171
172 void (*cleanup_layoutcommit) (struct nfs4_layoutcommit_data *data);
173 int (*prepare_layoutcommit) (struct nfs4_layoutcommit_args *args);
174 int (*prepare_layoutstats) (struct nfs42_layoutstat_args *args);
175};
176
177struct pnfs_commit_ops {
178 void (*setup_ds_info)(struct pnfs_ds_commit_info *,
179 struct pnfs_layout_segment *);
180 void (*release_ds_info)(struct pnfs_ds_commit_info *,
181 struct inode *inode);
182 int (*commit_pagelist)(struct inode *inode,
183 struct list_head *mds_pages,
184 int how,
185 struct nfs_commit_info *cinfo);
186 void (*mark_request_commit) (struct nfs_page *req,
187 struct pnfs_layout_segment *lseg,
188 struct nfs_commit_info *cinfo,
189 u32 ds_commit_idx);
190 void (*clear_request_commit) (struct nfs_page *req,
191 struct nfs_commit_info *cinfo);
192 int (*scan_commit_lists) (struct nfs_commit_info *cinfo,
193 int max);
194 void (*recover_commit_reqs) (struct list_head *list,
195 struct nfs_commit_info *cinfo);
196 struct nfs_page * (*search_commit_reqs)(struct nfs_commit_info *cinfo,
197 struct page *page);
198};
199
200struct pnfs_layout_hdr {
201 refcount_t plh_refcount;
202 atomic_t plh_outstanding; /* number of RPCs out */
203 struct list_head plh_layouts; /* other client layouts */
204 struct list_head plh_bulk_destroy;
205 struct list_head plh_segs; /* layout segments list */
206 struct list_head plh_return_segs; /* invalid layout segments */
207 unsigned long plh_block_lgets; /* block LAYOUTGET if >0 */
208 unsigned long plh_retry_timestamp;
209 unsigned long plh_flags;
210 nfs4_stateid plh_stateid;
211 u32 plh_barrier; /* ignore lower seqids */
212 u32 plh_return_seq;
213 enum pnfs_iomode plh_return_iomode;
214 loff_t plh_lwb; /* last write byte for layoutcommit */
215 const struct cred *plh_lc_cred; /* layoutcommit cred */
216 struct inode *plh_inode;
217 struct rcu_head plh_rcu;
218};
219
220struct pnfs_device {
221 struct nfs4_deviceid dev_id;
222 unsigned int layout_type;
223 unsigned int mincount;
224 unsigned int maxcount; /* gdia_maxcount */
225 struct page **pages;
226 unsigned int pgbase;
227 unsigned int pglen; /* reply buffer length */
228 unsigned char nocache : 1;/* May not be cached */
229};
230
231#define NFS4_PNFS_GETDEVLIST_MAXNUM 16
232
233struct pnfs_devicelist {
234 unsigned int eof;
235 unsigned int num_devs;
236 struct nfs4_deviceid dev_id[NFS4_PNFS_GETDEVLIST_MAXNUM];
237};
238
239extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *);
240extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *);
241
242/* nfs4proc.c */
243extern size_t max_response_pages(struct nfs_server *server);
244extern int nfs4_proc_getdeviceinfo(struct nfs_server *server,
245 struct pnfs_device *dev,
246 const struct cred *cred);
247extern struct pnfs_layout_segment* nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout);
248extern int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync);
249
250/* pnfs.c */
251void pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo);
252void pnfs_put_lseg(struct pnfs_layout_segment *lseg);
253
254void set_pnfs_layoutdriver(struct nfs_server *, const struct nfs_fh *, struct nfs_fsinfo *);
255void unset_pnfs_layoutdriver(struct nfs_server *);
256void pnfs_generic_pg_check_layout(struct nfs_pageio_descriptor *pgio);
257void pnfs_generic_pg_check_range(struct nfs_pageio_descriptor *pgio, struct nfs_page *req);
258void pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *, struct nfs_page *);
259int pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc);
260void pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
261 struct nfs_page *req, u64 wb_size);
262void pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *);
263int pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc);
264size_t pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
265 struct nfs_page *prev, struct nfs_page *req);
266void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg);
267struct pnfs_layout_segment *pnfs_layout_process(struct nfs4_layoutget *lgp);
268void pnfs_layoutget_free(struct nfs4_layoutget *lgp);
269void pnfs_free_lseg_list(struct list_head *tmp_list);
270void pnfs_destroy_layout(struct nfs_inode *);
271void pnfs_destroy_layout_final(struct nfs_inode *);
272void pnfs_destroy_all_layouts(struct nfs_client *);
273int pnfs_destroy_layouts_byfsid(struct nfs_client *clp,
274 struct nfs_fsid *fsid,
275 bool is_recall);
276int pnfs_destroy_layouts_byclid(struct nfs_client *clp,
277 bool is_recall);
278bool nfs4_layout_refresh_old_stateid(nfs4_stateid *dst,
279 struct pnfs_layout_range *dst_range,
280 struct inode *inode);
281void pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo);
282void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo,
283 const nfs4_stateid *new,
284 const struct cred *cred,
285 bool update_barrier);
286int pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
287 struct list_head *tmp_list,
288 const struct pnfs_layout_range *recall_range,
289 u32 seq);
290int pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo,
291 struct list_head *tmp_list,
292 const struct pnfs_layout_range *recall_range,
293 u32 seq);
294int pnfs_mark_layout_stateid_invalid(struct pnfs_layout_hdr *lo,
295 struct list_head *lseg_list);
296bool pnfs_roc(struct inode *ino,
297 struct nfs4_layoutreturn_args *args,
298 struct nfs4_layoutreturn_res *res,
299 const struct cred *cred);
300int pnfs_roc_done(struct rpc_task *task, struct nfs4_layoutreturn_args **argpp,
301 struct nfs4_layoutreturn_res **respp, int *ret);
302void pnfs_roc_release(struct nfs4_layoutreturn_args *args,
303 struct nfs4_layoutreturn_res *res,
304 int ret);
305bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task);
306void pnfs_set_layoutcommit(struct inode *, struct pnfs_layout_segment *, loff_t);
307void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data);
308int pnfs_layoutcommit_inode(struct inode *inode, bool sync);
309int pnfs_generic_sync(struct inode *inode, bool datasync);
310int pnfs_nfs_generic_sync(struct inode *inode, bool datasync);
311int _pnfs_return_layout(struct inode *);
312int pnfs_commit_and_return_layout(struct inode *);
313void pnfs_ld_write_done(struct nfs_pgio_header *);
314void pnfs_ld_read_done(struct nfs_pgio_header *);
315void pnfs_read_resend_pnfs(struct nfs_pgio_header *, unsigned int mirror_idx);
316struct pnfs_layout_segment *pnfs_update_layout(struct inode *ino,
317 struct nfs_open_context *ctx,
318 loff_t pos,
319 u64 count,
320 enum pnfs_iomode iomode,
321 bool strict_iomode,
322 gfp_t gfp_flags);
323void pnfs_layoutreturn_free_lsegs(struct pnfs_layout_hdr *lo,
324 const nfs4_stateid *arg_stateid,
325 const struct pnfs_layout_range *range,
326 const nfs4_stateid *stateid);
327
328void pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo,
329 struct pnfs_layout_segment *lseg,
330 bool (*is_after)(const struct pnfs_layout_range *lseg_range,
331 const struct pnfs_layout_range *old),
332 bool (*do_merge)(struct pnfs_layout_segment *lseg,
333 struct pnfs_layout_segment *old),
334 struct list_head *free_me);
335
336void nfs4_deviceid_mark_client_invalid(struct nfs_client *clp);
337int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *);
338int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *);
339struct nfs4_threshold *pnfs_mdsthreshold_alloc(void);
340void pnfs_error_mark_layout_for_return(struct inode *inode,
341 struct pnfs_layout_segment *lseg);
342void pnfs_layout_return_unused_byclid(struct nfs_client *clp,
343 enum pnfs_iomode iomode);
344
345/* nfs4_deviceid_flags */
346enum {
347 NFS_DEVICEID_INVALID = 0, /* set when MDS clientid recalled */
348 NFS_DEVICEID_UNAVAILABLE, /* device temporarily unavailable */
349 NFS_DEVICEID_NOCACHE, /* device may not be cached */
350};
351
352/* pnfs_dev.c */
353struct nfs4_deviceid_node {
354 struct hlist_node node;
355 struct hlist_node tmpnode;
356 const struct pnfs_layoutdriver_type *ld;
357 const struct nfs_client *nfs_client;
358 unsigned long flags;
359 unsigned long timestamp_unavailable;
360 struct nfs4_deviceid deviceid;
361 struct rcu_head rcu;
362 atomic_t ref;
363};
364
365struct nfs4_deviceid_node *
366nfs4_find_get_deviceid(struct nfs_server *server,
367 const struct nfs4_deviceid *id, const struct cred *cred,
368 gfp_t gfp_mask);
369void nfs4_delete_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
370void nfs4_init_deviceid_node(struct nfs4_deviceid_node *, struct nfs_server *,
371 const struct nfs4_deviceid *);
372bool nfs4_put_deviceid_node(struct nfs4_deviceid_node *);
373void nfs4_mark_deviceid_available(struct nfs4_deviceid_node *node);
374void nfs4_mark_deviceid_unavailable(struct nfs4_deviceid_node *node);
375bool nfs4_test_deviceid_unavailable(struct nfs4_deviceid_node *node);
376void nfs4_deviceid_purge_client(const struct nfs_client *);
377
378/* pnfs_nfs.c */
379struct pnfs_commit_array *pnfs_alloc_commit_array(size_t n, gfp_t gfp_flags);
380void pnfs_free_commit_array(struct pnfs_commit_array *p);
381struct pnfs_commit_array *pnfs_add_commit_array(struct pnfs_ds_commit_info *,
382 struct pnfs_commit_array *,
383 struct pnfs_layout_segment *);
384
385void pnfs_generic_ds_cinfo_release_lseg(struct pnfs_ds_commit_info *fl_cinfo,
386 struct pnfs_layout_segment *lseg);
387void pnfs_generic_ds_cinfo_destroy(struct pnfs_ds_commit_info *fl_cinfo);
388
389void pnfs_generic_clear_request_commit(struct nfs_page *req,
390 struct nfs_commit_info *cinfo);
391void pnfs_generic_commit_release(void *calldata);
392void pnfs_generic_prepare_to_resend_writes(struct nfs_commit_data *data);
393void pnfs_generic_rw_release(void *data);
394void pnfs_generic_recover_commit_reqs(struct list_head *dst,
395 struct nfs_commit_info *cinfo);
396struct nfs_page *pnfs_generic_search_commit_reqs(struct nfs_commit_info *cinfo,
397 struct page *page);
398int pnfs_generic_commit_pagelist(struct inode *inode,
399 struct list_head *mds_pages,
400 int how,
401 struct nfs_commit_info *cinfo,
402 int (*initiate_commit)(struct nfs_commit_data *data,
403 int how));
404int pnfs_generic_scan_commit_lists(struct nfs_commit_info *cinfo, int max);
405void pnfs_generic_write_commit_done(struct rpc_task *task, void *data);
406void nfs4_pnfs_ds_put(struct nfs4_pnfs_ds *ds);
407struct nfs4_pnfs_ds *nfs4_pnfs_ds_add(struct list_head *dsaddrs,
408 gfp_t gfp_flags);
409void nfs4_pnfs_v3_ds_connect_unload(void);
410int nfs4_pnfs_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds,
411 struct nfs4_deviceid_node *devid, unsigned int timeo,
412 unsigned int retrans, u32 version, u32 minor_version);
413struct nfs4_pnfs_ds_addr *nfs4_decode_mp_ds_addr(struct net *net,
414 struct xdr_stream *xdr,
415 gfp_t gfp_flags);
416void pnfs_layout_mark_request_commit(struct nfs_page *req,
417 struct pnfs_layout_segment *lseg,
418 struct nfs_commit_info *cinfo,
419 u32 ds_commit_idx);
420void pnfs_lgopen_prepare(struct nfs4_opendata *data,
421 struct nfs_open_context *ctx);
422void pnfs_parse_lgopen(struct inode *ino, struct nfs4_layoutget *lgp,
423 struct nfs_open_context *ctx);
424void nfs4_lgopen_release(struct nfs4_layoutget *lgp);
425
426static inline bool nfs_have_layout(struct inode *inode)
427{
428 return NFS_I(inode)->layout != NULL;
429}
430
431static inline bool pnfs_layout_is_valid(const struct pnfs_layout_hdr *lo)
432{
433 return test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) == 0;
434}
435
436static inline struct nfs4_deviceid_node *
437nfs4_get_deviceid(struct nfs4_deviceid_node *d)
438{
439 atomic_inc(&d->ref);
440 return d;
441}
442
443static inline struct pnfs_layout_segment *
444pnfs_get_lseg(struct pnfs_layout_segment *lseg)
445{
446 if (lseg) {
447 refcount_inc(&lseg->pls_refcount);
448 smp_mb__after_atomic();
449 }
450 return lseg;
451}
452
453static inline bool
454pnfs_is_valid_lseg(struct pnfs_layout_segment *lseg)
455{
456 return test_bit(NFS_LSEG_VALID, &lseg->pls_flags) != 0;
457}
458
459/* Return true if a layout driver is being used for this mountpoint */
460static inline int pnfs_enabled_sb(struct nfs_server *nfss)
461{
462 return nfss->pnfs_curr_ld != NULL;
463}
464
465static inline int
466pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
467 struct nfs_commit_info *cinfo)
468{
469 struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds;
470
471 if (fl_cinfo == NULL || fl_cinfo->ncommitting == 0)
472 return PNFS_NOT_ATTEMPTED;
473 return fl_cinfo->ops->commit_pagelist(inode, mds_pages, how, cinfo);
474}
475
476static inline struct pnfs_ds_commit_info *
477pnfs_get_ds_info(struct inode *inode)
478{
479 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
480
481 if (ld == NULL || ld->get_ds_info == NULL)
482 return NULL;
483 return ld->get_ds_info(inode);
484}
485
486static inline void
487pnfs_init_ds_commit_info_ops(struct pnfs_ds_commit_info *fl_cinfo, struct inode *inode)
488{
489 struct pnfs_ds_commit_info *inode_cinfo = pnfs_get_ds_info(inode);
490 if (inode_cinfo != NULL)
491 fl_cinfo->ops = inode_cinfo->ops;
492}
493
494static inline void
495pnfs_init_ds_commit_info(struct pnfs_ds_commit_info *fl_cinfo)
496{
497 INIT_LIST_HEAD(&fl_cinfo->commits);
498 fl_cinfo->ops = NULL;
499}
500
501static inline void
502pnfs_release_ds_info(struct pnfs_ds_commit_info *fl_cinfo, struct inode *inode)
503{
504 if (fl_cinfo->ops != NULL && fl_cinfo->ops->release_ds_info != NULL)
505 fl_cinfo->ops->release_ds_info(fl_cinfo, inode);
506}
507
508static inline void
509pnfs_generic_mark_devid_invalid(struct nfs4_deviceid_node *node)
510{
511 set_bit(NFS_DEVICEID_INVALID, &node->flags);
512}
513
514static inline bool
515pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
516 struct nfs_commit_info *cinfo, u32 ds_commit_idx)
517{
518 struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds;
519
520 if (!lseg || !fl_cinfo->ops->mark_request_commit)
521 return false;
522 fl_cinfo->ops->mark_request_commit(req, lseg, cinfo, ds_commit_idx);
523 return true;
524}
525
526static inline bool
527pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
528{
529 struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds;
530
531 if (!fl_cinfo || !fl_cinfo->ops || !fl_cinfo->ops->clear_request_commit)
532 return false;
533 fl_cinfo->ops->clear_request_commit(req, cinfo);
534 return true;
535}
536
537static inline int
538pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
539 int max)
540{
541 struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds;
542
543 if (!fl_cinfo || fl_cinfo->nwritten == 0)
544 return 0;
545 return fl_cinfo->ops->scan_commit_lists(cinfo, max);
546}
547
548static inline void
549pnfs_recover_commit_reqs(struct list_head *head, struct nfs_commit_info *cinfo)
550{
551 struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds;
552
553 if (fl_cinfo && fl_cinfo->nwritten != 0)
554 fl_cinfo->ops->recover_commit_reqs(head, cinfo);
555}
556
557static inline struct nfs_page *
558pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo,
559 struct page *page)
560{
561 struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds;
562
563 if (!fl_cinfo->ops || !fl_cinfo->ops->search_commit_reqs)
564 return NULL;
565 return fl_cinfo->ops->search_commit_reqs(cinfo, page);
566}
567
568/* Should the pNFS client commit and return the layout upon a setattr */
569static inline bool
570pnfs_ld_layoutret_on_setattr(struct inode *inode)
571{
572 if (!pnfs_enabled_sb(NFS_SERVER(inode)))
573 return false;
574 return NFS_SERVER(inode)->pnfs_curr_ld->flags &
575 PNFS_LAYOUTRET_ON_SETATTR;
576}
577
578static inline bool
579pnfs_ld_read_whole_page(struct inode *inode)
580{
581 if (!pnfs_enabled_sb(NFS_SERVER(inode)))
582 return false;
583 return NFS_SERVER(inode)->pnfs_curr_ld->flags & PNFS_READ_WHOLE_PAGE;
584}
585
586static inline int
587pnfs_sync_inode(struct inode *inode, bool datasync)
588{
589 if (!pnfs_enabled_sb(NFS_SERVER(inode)))
590 return 0;
591 return NFS_SERVER(inode)->pnfs_curr_ld->sync(inode, datasync);
592}
593
594static inline bool
595pnfs_layoutcommit_outstanding(struct inode *inode)
596{
597 struct nfs_inode *nfsi = NFS_I(inode);
598
599 return test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags) != 0 ||
600 test_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags) != 0;
601}
602
603static inline int pnfs_return_layout(struct inode *ino)
604{
605 struct nfs_inode *nfsi = NFS_I(ino);
606 struct nfs_server *nfss = NFS_SERVER(ino);
607
608 if (pnfs_enabled_sb(nfss) && nfsi->layout) {
609 set_bit(NFS_LAYOUT_RETURN_REQUESTED, &nfsi->layout->plh_flags);
610 return _pnfs_return_layout(ino);
611 }
612
613 return 0;
614}
615
616static inline bool
617pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
618 struct nfs_server *nfss)
619{
620 return (dst && src && src->bm != 0 && nfss->pnfs_curr_ld &&
621 nfss->pnfs_curr_ld->id == src->l_type);
622}
623
624static inline u64
625pnfs_calc_offset_end(u64 offset, u64 len)
626{
627 if (len == NFS4_MAX_UINT64 || len >= NFS4_MAX_UINT64 - offset)
628 return NFS4_MAX_UINT64;
629 return offset + len - 1;
630}
631
632static inline u64
633pnfs_calc_offset_length(u64 offset, u64 end)
634{
635 if (end == NFS4_MAX_UINT64 || end <= offset)
636 return NFS4_MAX_UINT64;
637 return 1 + end - offset;
638}
639
640static inline void
641pnfs_copy_range(struct pnfs_layout_range *dst,
642 const struct pnfs_layout_range *src)
643{
644 memcpy(dst, src, sizeof(*dst));
645}
646
647static inline u64
648pnfs_end_offset(u64 start, u64 len)
649{
650 if (NFS4_MAX_UINT64 - start <= len)
651 return NFS4_MAX_UINT64;
652 return start + len;
653}
654
655/*
656 * Are 2 ranges intersecting?
657 * start1 end1
658 * [----------------------------------)
659 * start2 end2
660 * [----------------)
661 */
662static inline bool
663pnfs_is_range_intersecting(u64 start1, u64 end1, u64 start2, u64 end2)
664{
665 return (end1 == NFS4_MAX_UINT64 || start2 < end1) &&
666 (end2 == NFS4_MAX_UINT64 || start1 < end2);
667}
668
669static inline bool
670pnfs_lseg_range_intersecting(const struct pnfs_layout_range *l1,
671 const struct pnfs_layout_range *l2)
672{
673 u64 end1 = pnfs_end_offset(l1->offset, l1->length);
674 u64 end2 = pnfs_end_offset(l2->offset, l2->length);
675
676 return pnfs_is_range_intersecting(l1->offset, end1, l2->offset, end2);
677}
678
679static inline bool
680pnfs_lseg_request_intersecting(struct pnfs_layout_segment *lseg, struct nfs_page *req)
681{
682 u64 seg_last = pnfs_end_offset(lseg->pls_range.offset, lseg->pls_range.length);
683 u64 req_last = req_offset(req) + req->wb_bytes;
684
685 return pnfs_is_range_intersecting(lseg->pls_range.offset, seg_last,
686 req_offset(req), req_last);
687}
688
689extern unsigned int layoutstats_timer;
690
691#ifdef NFS_DEBUG
692void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id);
693#else
694static inline void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id)
695{
696}
697
698#endif /* NFS_DEBUG */
699#else /* CONFIG_NFS_V4_1 */
700
701static inline bool nfs_have_layout(struct inode *inode)
702{
703 return false;
704}
705
706static inline void pnfs_destroy_all_layouts(struct nfs_client *clp)
707{
708}
709
710static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
711{
712}
713
714static inline void pnfs_destroy_layout_final(struct nfs_inode *nfsi)
715{
716}
717
718static inline struct pnfs_layout_segment *
719pnfs_get_lseg(struct pnfs_layout_segment *lseg)
720{
721 return NULL;
722}
723
724static inline void pnfs_put_lseg(struct pnfs_layout_segment *lseg)
725{
726}
727
728static inline int pnfs_return_layout(struct inode *ino)
729{
730 return 0;
731}
732
733static inline int pnfs_commit_and_return_layout(struct inode *inode)
734{
735 return 0;
736}
737
738static inline bool
739pnfs_ld_layoutret_on_setattr(struct inode *inode)
740{
741 return false;
742}
743
744static inline bool
745pnfs_ld_read_whole_page(struct inode *inode)
746{
747 return false;
748}
749
750static inline int
751pnfs_sync_inode(struct inode *inode, bool datasync)
752{
753 return 0;
754}
755
756static inline bool
757pnfs_layoutcommit_outstanding(struct inode *inode)
758{
759 return false;
760}
761
762
763static inline bool
764pnfs_roc(struct inode *ino,
765 struct nfs4_layoutreturn_args *args,
766 struct nfs4_layoutreturn_res *res,
767 const struct cred *cred)
768{
769 return false;
770}
771
772static inline int
773pnfs_roc_done(struct rpc_task *task,
774 struct nfs4_layoutreturn_args **argpp,
775 struct nfs4_layoutreturn_res **respp,
776 int *ret)
777{
778 return 0;
779}
780
781static inline void
782pnfs_roc_release(struct nfs4_layoutreturn_args *args,
783 struct nfs4_layoutreturn_res *res,
784 int ret)
785{
786}
787
788static inline bool
789pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task)
790{
791 return false;
792}
793
794static inline void set_pnfs_layoutdriver(struct nfs_server *s,
795 const struct nfs_fh *mntfh,
796 struct nfs_fsinfo *fsinfo)
797{
798}
799
800static inline void unset_pnfs_layoutdriver(struct nfs_server *s)
801{
802}
803
804static inline int
805pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
806 struct nfs_commit_info *cinfo)
807{
808 return PNFS_NOT_ATTEMPTED;
809}
810
811static inline struct pnfs_ds_commit_info *
812pnfs_get_ds_info(struct inode *inode)
813{
814 return NULL;
815}
816
817static inline void
818pnfs_init_ds_commit_info_ops(struct pnfs_ds_commit_info *fl_cinfo, struct inode *inode)
819{
820}
821
822static inline void
823pnfs_init_ds_commit_info(struct pnfs_ds_commit_info *fl_cinfo)
824{
825}
826
827static inline void
828pnfs_release_ds_info(struct pnfs_ds_commit_info *fl_cinfo, struct inode *inode)
829{
830}
831
832static inline bool
833pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
834 struct nfs_commit_info *cinfo, u32 ds_commit_idx)
835{
836 return false;
837}
838
839static inline bool
840pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
841{
842 return false;
843}
844
845static inline int
846pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
847 int max)
848{
849 return 0;
850}
851
852static inline void
853pnfs_recover_commit_reqs(struct list_head *head, struct nfs_commit_info *cinfo)
854{
855}
856
857static inline struct nfs_page *
858pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo,
859 struct page *page)
860{
861 return NULL;
862}
863
864static inline int pnfs_layoutcommit_inode(struct inode *inode, bool sync)
865{
866 return 0;
867}
868
869static inline bool
870pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
871 struct nfs_server *nfss)
872{
873 return false;
874}
875
876static inline struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
877{
878 return NULL;
879}
880
881static inline void nfs4_pnfs_v3_ds_connect_unload(void)
882{
883}
884
885static inline bool nfs4_layout_refresh_old_stateid(nfs4_stateid *dst,
886 struct pnfs_layout_range *dst_range,
887 struct inode *inode)
888{
889 return false;
890}
891
892static inline void pnfs_lgopen_prepare(struct nfs4_opendata *data,
893 struct nfs_open_context *ctx)
894{
895}
896
897static inline void pnfs_parse_lgopen(struct inode *ino,
898 struct nfs4_layoutget *lgp,
899 struct nfs_open_context *ctx)
900{
901}
902
903static inline void nfs4_lgopen_release(struct nfs4_layoutget *lgp)
904{
905}
906
907static inline bool pnfs_layout_is_valid(const struct pnfs_layout_hdr *lo)
908{
909 return false;
910}
911
912#endif /* CONFIG_NFS_V4_1 */
913
914#if IS_ENABLED(CONFIG_NFS_V4_2)
915int pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags);
916#else
917static inline int
918pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags)
919{
920 return 0;
921}
922#endif
923
924#endif /* FS_NFS_PNFS_H */
1/*
2 * pNFS client data structures.
3 *
4 * Copyright (c) 2002
5 * The Regents of the University of Michigan
6 * All Rights Reserved
7 *
8 * Dean Hildebrand <dhildebz@umich.edu>
9 *
10 * Permission is granted to use, copy, create derivative works, and
11 * redistribute this software and such derivative works for any purpose,
12 * so long as the name of the University of Michigan is not used in
13 * any advertising or publicity pertaining to the use or distribution
14 * of this software without specific, written prior authorization. If
15 * the above copyright notice or any other identification of the
16 * University of Michigan is included in any copy of any portion of
17 * this software, then the disclaimer below must also be included.
18 *
19 * This software is provided as is, without representation or warranty
20 * of any kind either express or implied, including without limitation
21 * the implied warranties of merchantability, fitness for a particular
22 * purpose, or noninfringement. The Regents of the University of
23 * Michigan shall not be liable for any damages, including special,
24 * indirect, incidental, or consequential damages, with respect to any
25 * claim arising out of or in connection with the use of the software,
26 * even if it has been or is hereafter advised of the possibility of
27 * such damages.
28 */
29
30#ifndef FS_NFS_PNFS_H
31#define FS_NFS_PNFS_H
32
33#include <linux/refcount.h>
34#include <linux/nfs_fs.h>
35#include <linux/nfs_page.h>
36#include <linux/workqueue.h>
37
38struct nfs4_opendata;
39
40enum {
41 NFS_LSEG_VALID = 0, /* cleared when lseg is recalled/returned */
42 NFS_LSEG_ROC, /* roc bit received from server */
43 NFS_LSEG_LAYOUTCOMMIT, /* layoutcommit bit set for layoutcommit */
44 NFS_LSEG_LAYOUTRETURN, /* layoutreturn bit set for layoutreturn */
45 NFS_LSEG_UNAVAILABLE, /* unavailable bit set for temporary problem */
46};
47
48/* Individual ip address */
49struct nfs4_pnfs_ds_addr {
50 struct sockaddr_storage da_addr;
51 size_t da_addrlen;
52 struct list_head da_node; /* nfs4_pnfs_dev_hlist dev_dslist */
53 char *da_remotestr; /* human readable addr+port */
54 const char *da_netid;
55 int da_transport;
56};
57
58struct nfs4_pnfs_ds {
59 struct list_head ds_node; /* nfs4_pnfs_dev_hlist dev_dslist */
60 char *ds_remotestr; /* comma sep list of addrs */
61 struct list_head ds_addrs;
62 struct nfs_client *ds_clp;
63 refcount_t ds_count;
64 unsigned long ds_state;
65#define NFS4DS_CONNECTING 0 /* ds is establishing connection */
66};
67
68struct pnfs_layout_segment {
69 struct list_head pls_list;
70 struct list_head pls_lc_list;
71 struct list_head pls_commits;
72 struct pnfs_layout_range pls_range;
73 refcount_t pls_refcount;
74 u32 pls_seq;
75 unsigned long pls_flags;
76 struct pnfs_layout_hdr *pls_layout;
77};
78
79enum pnfs_try_status {
80 PNFS_ATTEMPTED = 0,
81 PNFS_NOT_ATTEMPTED = 1,
82 PNFS_TRY_AGAIN = 2,
83};
84
85#ifdef CONFIG_NFS_V4_1
86
87#define LAYOUT_NFSV4_1_MODULE_PREFIX "nfs-layouttype4"
88
89/*
90 * Default data server connection timeout and retrans vaules.
91 * Set by module parameters dataserver_timeo and dataserver_retrans.
92 */
93#define NFS4_DEF_DS_TIMEO 600 /* in tenths of a second */
94#define NFS4_DEF_DS_RETRANS 5
95#define PNFS_DEVICE_RETRY_TIMEOUT (120*HZ)
96
97enum {
98 NFS_LAYOUT_RO_FAILED = 0, /* get ro layout failed stop trying */
99 NFS_LAYOUT_RW_FAILED, /* get rw layout failed stop trying */
100 NFS_LAYOUT_BULK_RECALL, /* bulk recall affecting layout */
101 NFS_LAYOUT_RETURN, /* layoutreturn in progress */
102 NFS_LAYOUT_RETURN_LOCK, /* Serialise layoutreturn */
103 NFS_LAYOUT_RETURN_REQUESTED, /* Return this layout ASAP */
104 NFS_LAYOUT_INVALID_STID, /* layout stateid id is invalid */
105 NFS_LAYOUT_FIRST_LAYOUTGET, /* Serialize first layoutget */
106 NFS_LAYOUT_INODE_FREEING, /* The inode is being freed */
107 NFS_LAYOUT_HASHED, /* The layout visible */
108 NFS_LAYOUT_DRAIN,
109};
110
111enum layoutdriver_policy_flags {
112 /* Should the pNFS client commit and return the layout upon truncate to
113 * a smaller size */
114 PNFS_LAYOUTRET_ON_SETATTR = 1 << 0,
115 PNFS_LAYOUTRET_ON_ERROR = 1 << 1,
116 PNFS_READ_WHOLE_PAGE = 1 << 2,
117 PNFS_LAYOUTGET_ON_OPEN = 1 << 3,
118};
119
120struct nfs4_deviceid_node;
121
122/* Per-layout driver specific registration structure */
123struct pnfs_layoutdriver_type {
124 struct list_head pnfs_tblid;
125 const u32 id;
126 const char *name;
127 struct module *owner;
128 unsigned flags;
129 unsigned max_deviceinfo_size;
130 unsigned max_layoutget_response;
131
132 int (*set_layoutdriver) (struct nfs_server *, const struct nfs_fh *);
133 int (*clear_layoutdriver) (struct nfs_server *);
134
135 struct pnfs_layout_hdr * (*alloc_layout_hdr) (struct inode *inode, gfp_t gfp_flags);
136 void (*free_layout_hdr) (struct pnfs_layout_hdr *);
137
138 struct pnfs_layout_segment * (*alloc_lseg) (struct pnfs_layout_hdr *layoutid, struct nfs4_layoutget_res *lgr, gfp_t gfp_flags);
139 void (*free_lseg) (struct pnfs_layout_segment *lseg);
140 void (*add_lseg) (struct pnfs_layout_hdr *layoutid,
141 struct pnfs_layout_segment *lseg,
142 struct list_head *free_me);
143
144 void (*return_range) (struct pnfs_layout_hdr *lo,
145 struct pnfs_layout_range *range);
146
147 /* test for nfs page cache coalescing */
148 const struct nfs_pageio_ops *pg_read_ops;
149 const struct nfs_pageio_ops *pg_write_ops;
150
151 struct pnfs_ds_commit_info *(*get_ds_info) (struct inode *inode);
152
153 int (*sync)(struct inode *inode, bool datasync);
154
155 /*
156 * Return PNFS_ATTEMPTED to indicate the layout code has attempted
157 * I/O, else return PNFS_NOT_ATTEMPTED to fall back to normal NFS
158 */
159 enum pnfs_try_status (*read_pagelist)(struct nfs_pgio_header *);
160 enum pnfs_try_status (*write_pagelist)(struct nfs_pgio_header *, int);
161
162 void (*free_deviceid_node) (struct nfs4_deviceid_node *);
163 struct nfs4_deviceid_node * (*alloc_deviceid_node)
164 (struct nfs_server *server, struct pnfs_device *pdev,
165 gfp_t gfp_flags);
166
167 int (*prepare_layoutreturn) (struct nfs4_layoutreturn_args *);
168
169 void (*cleanup_layoutcommit) (struct nfs4_layoutcommit_data *data);
170 int (*prepare_layoutcommit) (struct nfs4_layoutcommit_args *args);
171 int (*prepare_layoutstats) (struct nfs42_layoutstat_args *args);
172
173 void (*cancel_io)(struct pnfs_layout_segment *lseg);
174};
175
176struct pnfs_commit_ops {
177 void (*setup_ds_info)(struct pnfs_ds_commit_info *,
178 struct pnfs_layout_segment *);
179 void (*release_ds_info)(struct pnfs_ds_commit_info *,
180 struct inode *inode);
181 int (*commit_pagelist)(struct inode *inode,
182 struct list_head *mds_pages,
183 int how,
184 struct nfs_commit_info *cinfo);
185 void (*mark_request_commit) (struct nfs_page *req,
186 struct pnfs_layout_segment *lseg,
187 struct nfs_commit_info *cinfo,
188 u32 ds_commit_idx);
189 void (*clear_request_commit) (struct nfs_page *req,
190 struct nfs_commit_info *cinfo);
191 int (*scan_commit_lists) (struct nfs_commit_info *cinfo,
192 int max);
193 void (*recover_commit_reqs) (struct list_head *list,
194 struct nfs_commit_info *cinfo);
195 struct nfs_page * (*search_commit_reqs)(struct nfs_commit_info *cinfo,
196 struct page *page);
197};
198
199struct pnfs_layout_hdr {
200 refcount_t plh_refcount;
201 atomic_t plh_outstanding; /* number of RPCs out */
202 struct list_head plh_layouts; /* other client layouts */
203 struct list_head plh_bulk_destroy;
204 struct list_head plh_segs; /* layout segments list */
205 struct list_head plh_return_segs; /* invalid layout segments */
206 unsigned long plh_block_lgets; /* block LAYOUTGET if >0 */
207 unsigned long plh_retry_timestamp;
208 unsigned long plh_flags;
209 nfs4_stateid plh_stateid;
210 u32 plh_barrier; /* ignore lower seqids */
211 u32 plh_return_seq;
212 enum pnfs_iomode plh_return_iomode;
213 loff_t plh_lwb; /* last write byte for layoutcommit */
214 const struct cred *plh_lc_cred; /* layoutcommit cred */
215 struct inode *plh_inode;
216 struct rcu_head plh_rcu;
217};
218
219struct pnfs_device {
220 struct nfs4_deviceid dev_id;
221 unsigned int layout_type;
222 unsigned int mincount;
223 unsigned int maxcount; /* gdia_maxcount */
224 struct page **pages;
225 unsigned int pgbase;
226 unsigned int pglen; /* reply buffer length */
227 unsigned char nocache : 1;/* May not be cached */
228};
229
230#define NFS4_PNFS_GETDEVLIST_MAXNUM 16
231
232struct pnfs_devicelist {
233 unsigned int eof;
234 unsigned int num_devs;
235 struct nfs4_deviceid dev_id[NFS4_PNFS_GETDEVLIST_MAXNUM];
236};
237
238extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *);
239extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *);
240extern const struct pnfs_layoutdriver_type *pnfs_find_layoutdriver(u32 id);
241extern void pnfs_put_layoutdriver(const struct pnfs_layoutdriver_type *ld);
242
243/* nfs4proc.c */
244extern size_t max_response_pages(struct nfs_server *server);
245extern int nfs4_proc_getdeviceinfo(struct nfs_server *server,
246 struct pnfs_device *dev,
247 const struct cred *cred);
248extern struct pnfs_layout_segment* nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout);
249extern int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync);
250
251/* pnfs.c */
252void pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo);
253void pnfs_put_lseg(struct pnfs_layout_segment *lseg);
254
255void set_pnfs_layoutdriver(struct nfs_server *, const struct nfs_fh *, struct nfs_fsinfo *);
256void unset_pnfs_layoutdriver(struct nfs_server *);
257void pnfs_generic_pg_check_layout(struct nfs_pageio_descriptor *pgio);
258void pnfs_generic_pg_check_range(struct nfs_pageio_descriptor *pgio, struct nfs_page *req);
259void pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *, struct nfs_page *);
260int pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc);
261void pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
262 struct nfs_page *req, u64 wb_size);
263void pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *);
264int pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc);
265size_t pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
266 struct nfs_page *prev, struct nfs_page *req);
267void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg);
268struct pnfs_layout_segment *pnfs_layout_process(struct nfs4_layoutget *lgp);
269void pnfs_layoutget_free(struct nfs4_layoutget *lgp);
270void pnfs_free_lseg_list(struct list_head *tmp_list);
271void pnfs_destroy_layout(struct nfs_inode *);
272void pnfs_destroy_layout_final(struct nfs_inode *);
273void pnfs_destroy_all_layouts(struct nfs_client *);
274int pnfs_destroy_layouts_byfsid(struct nfs_client *clp,
275 struct nfs_fsid *fsid,
276 bool is_recall);
277int pnfs_destroy_layouts_byclid(struct nfs_client *clp,
278 bool is_recall);
279bool nfs4_layout_refresh_old_stateid(nfs4_stateid *dst,
280 struct pnfs_layout_range *dst_range,
281 struct inode *inode);
282void pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo);
283void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo,
284 const nfs4_stateid *new,
285 const struct cred *cred,
286 bool update_barrier);
287int pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
288 struct list_head *tmp_list,
289 const struct pnfs_layout_range *recall_range,
290 u32 seq);
291int pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo,
292 struct list_head *tmp_list,
293 const struct pnfs_layout_range *recall_range,
294 u32 seq);
295int pnfs_mark_layout_stateid_invalid(struct pnfs_layout_hdr *lo,
296 struct list_head *lseg_list);
297bool pnfs_roc(struct inode *ino,
298 struct nfs4_layoutreturn_args *args,
299 struct nfs4_layoutreturn_res *res,
300 const struct cred *cred);
301int pnfs_roc_done(struct rpc_task *task, struct nfs4_layoutreturn_args **argpp,
302 struct nfs4_layoutreturn_res **respp, int *ret);
303void pnfs_roc_release(struct nfs4_layoutreturn_args *args,
304 struct nfs4_layoutreturn_res *res,
305 int ret);
306bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task);
307void pnfs_set_layoutcommit(struct inode *, struct pnfs_layout_segment *, loff_t);
308void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data);
309int pnfs_layoutcommit_inode(struct inode *inode, bool sync);
310int pnfs_generic_sync(struct inode *inode, bool datasync);
311int pnfs_nfs_generic_sync(struct inode *inode, bool datasync);
312int _pnfs_return_layout(struct inode *);
313int pnfs_commit_and_return_layout(struct inode *);
314void pnfs_ld_write_done(struct nfs_pgio_header *);
315void pnfs_ld_read_done(struct nfs_pgio_header *);
316void pnfs_read_resend_pnfs(struct nfs_pgio_header *, unsigned int mirror_idx);
317struct pnfs_layout_segment *pnfs_update_layout(struct inode *ino,
318 struct nfs_open_context *ctx,
319 loff_t pos,
320 u64 count,
321 enum pnfs_iomode iomode,
322 bool strict_iomode,
323 gfp_t gfp_flags);
324void pnfs_layoutreturn_free_lsegs(struct pnfs_layout_hdr *lo,
325 const nfs4_stateid *arg_stateid,
326 const struct pnfs_layout_range *range,
327 const nfs4_stateid *stateid);
328
329void pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo,
330 struct pnfs_layout_segment *lseg,
331 bool (*is_after)(const struct pnfs_layout_range *lseg_range,
332 const struct pnfs_layout_range *old),
333 bool (*do_merge)(struct pnfs_layout_segment *lseg,
334 struct pnfs_layout_segment *old),
335 struct list_head *free_me);
336
337void nfs4_deviceid_mark_client_invalid(struct nfs_client *clp);
338int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *);
339int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *);
340struct nfs4_threshold *pnfs_mdsthreshold_alloc(void);
341void pnfs_error_mark_layout_for_return(struct inode *inode,
342 struct pnfs_layout_segment *lseg);
343void pnfs_layout_return_unused_byclid(struct nfs_client *clp,
344 enum pnfs_iomode iomode);
345
346/* nfs4_deviceid_flags */
347enum {
348 NFS_DEVICEID_INVALID = 0, /* set when MDS clientid recalled */
349 NFS_DEVICEID_UNAVAILABLE, /* device temporarily unavailable */
350 NFS_DEVICEID_NOCACHE, /* device may not be cached */
351};
352
353/* pnfs_dev.c */
354struct nfs4_deviceid_node {
355 struct hlist_node node;
356 struct hlist_node tmpnode;
357 const struct pnfs_layoutdriver_type *ld;
358 const struct nfs_client *nfs_client;
359 unsigned long flags;
360 unsigned long timestamp_unavailable;
361 struct nfs4_deviceid deviceid;
362 struct rcu_head rcu;
363 atomic_t ref;
364};
365
366struct nfs4_deviceid_node *
367nfs4_find_get_deviceid(struct nfs_server *server,
368 const struct nfs4_deviceid *id, const struct cred *cred,
369 gfp_t gfp_mask);
370void nfs4_delete_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
371void nfs4_init_deviceid_node(struct nfs4_deviceid_node *, struct nfs_server *,
372 const struct nfs4_deviceid *);
373bool nfs4_put_deviceid_node(struct nfs4_deviceid_node *);
374void nfs4_mark_deviceid_available(struct nfs4_deviceid_node *node);
375void nfs4_mark_deviceid_unavailable(struct nfs4_deviceid_node *node);
376bool nfs4_test_deviceid_unavailable(struct nfs4_deviceid_node *node);
377void nfs4_deviceid_purge_client(const struct nfs_client *);
378
379/* pnfs_nfs.c */
380struct pnfs_commit_array *pnfs_alloc_commit_array(size_t n, gfp_t gfp_flags);
381void pnfs_free_commit_array(struct pnfs_commit_array *p);
382struct pnfs_commit_array *pnfs_add_commit_array(struct pnfs_ds_commit_info *,
383 struct pnfs_commit_array *,
384 struct pnfs_layout_segment *);
385
386void pnfs_generic_ds_cinfo_release_lseg(struct pnfs_ds_commit_info *fl_cinfo,
387 struct pnfs_layout_segment *lseg);
388void pnfs_generic_ds_cinfo_destroy(struct pnfs_ds_commit_info *fl_cinfo);
389
390void pnfs_generic_clear_request_commit(struct nfs_page *req,
391 struct nfs_commit_info *cinfo);
392void pnfs_generic_commit_release(void *calldata);
393void pnfs_generic_prepare_to_resend_writes(struct nfs_commit_data *data);
394void pnfs_generic_rw_release(void *data);
395void pnfs_generic_recover_commit_reqs(struct list_head *dst,
396 struct nfs_commit_info *cinfo);
397struct nfs_page *pnfs_generic_search_commit_reqs(struct nfs_commit_info *cinfo,
398 struct page *page);
399int pnfs_generic_commit_pagelist(struct inode *inode,
400 struct list_head *mds_pages,
401 int how,
402 struct nfs_commit_info *cinfo,
403 int (*initiate_commit)(struct nfs_commit_data *data,
404 int how));
405int pnfs_generic_scan_commit_lists(struct nfs_commit_info *cinfo, int max);
406void pnfs_generic_write_commit_done(struct rpc_task *task, void *data);
407void nfs4_pnfs_ds_put(struct nfs4_pnfs_ds *ds);
408struct nfs4_pnfs_ds *nfs4_pnfs_ds_add(struct list_head *dsaddrs,
409 gfp_t gfp_flags);
410void nfs4_pnfs_v3_ds_connect_unload(void);
411int nfs4_pnfs_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds,
412 struct nfs4_deviceid_node *devid, unsigned int timeo,
413 unsigned int retrans, u32 version, u32 minor_version);
414struct nfs4_pnfs_ds_addr *nfs4_decode_mp_ds_addr(struct net *net,
415 struct xdr_stream *xdr,
416 gfp_t gfp_flags);
417void pnfs_layout_mark_request_commit(struct nfs_page *req,
418 struct pnfs_layout_segment *lseg,
419 struct nfs_commit_info *cinfo,
420 u32 ds_commit_idx);
421void pnfs_lgopen_prepare(struct nfs4_opendata *data,
422 struct nfs_open_context *ctx);
423void pnfs_parse_lgopen(struct inode *ino, struct nfs4_layoutget *lgp,
424 struct nfs_open_context *ctx);
425void nfs4_lgopen_release(struct nfs4_layoutget *lgp);
426
427static inline bool nfs_have_layout(struct inode *inode)
428{
429 return NFS_I(inode)->layout != NULL;
430}
431
432static inline bool pnfs_layout_is_valid(const struct pnfs_layout_hdr *lo)
433{
434 return test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) == 0;
435}
436
437static inline struct nfs4_deviceid_node *
438nfs4_get_deviceid(struct nfs4_deviceid_node *d)
439{
440 atomic_inc(&d->ref);
441 return d;
442}
443
444static inline struct pnfs_layout_segment *
445pnfs_get_lseg(struct pnfs_layout_segment *lseg)
446{
447 if (lseg) {
448 refcount_inc(&lseg->pls_refcount);
449 smp_mb__after_atomic();
450 }
451 return lseg;
452}
453
454static inline bool
455pnfs_is_valid_lseg(struct pnfs_layout_segment *lseg)
456{
457 return test_bit(NFS_LSEG_VALID, &lseg->pls_flags) != 0;
458}
459
460/* Return true if a layout driver is being used for this mountpoint */
461static inline int pnfs_enabled_sb(struct nfs_server *nfss)
462{
463 return nfss->pnfs_curr_ld != NULL;
464}
465
466static inline int
467pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
468 struct nfs_commit_info *cinfo)
469{
470 struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds;
471
472 if (fl_cinfo == NULL || fl_cinfo->ncommitting == 0)
473 return PNFS_NOT_ATTEMPTED;
474 return fl_cinfo->ops->commit_pagelist(inode, mds_pages, how, cinfo);
475}
476
477static inline struct pnfs_ds_commit_info *
478pnfs_get_ds_info(struct inode *inode)
479{
480 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
481
482 if (ld == NULL || ld->get_ds_info == NULL)
483 return NULL;
484 return ld->get_ds_info(inode);
485}
486
487static inline void
488pnfs_init_ds_commit_info_ops(struct pnfs_ds_commit_info *fl_cinfo, struct inode *inode)
489{
490 struct pnfs_ds_commit_info *inode_cinfo = pnfs_get_ds_info(inode);
491 if (inode_cinfo != NULL)
492 fl_cinfo->ops = inode_cinfo->ops;
493}
494
495static inline void
496pnfs_init_ds_commit_info(struct pnfs_ds_commit_info *fl_cinfo)
497{
498 INIT_LIST_HEAD(&fl_cinfo->commits);
499 fl_cinfo->ops = NULL;
500}
501
502static inline void
503pnfs_release_ds_info(struct pnfs_ds_commit_info *fl_cinfo, struct inode *inode)
504{
505 if (fl_cinfo->ops != NULL && fl_cinfo->ops->release_ds_info != NULL)
506 fl_cinfo->ops->release_ds_info(fl_cinfo, inode);
507}
508
509static inline void
510pnfs_generic_mark_devid_invalid(struct nfs4_deviceid_node *node)
511{
512 set_bit(NFS_DEVICEID_INVALID, &node->flags);
513}
514
515static inline bool
516pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
517 struct nfs_commit_info *cinfo, u32 ds_commit_idx)
518{
519 struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds;
520
521 if (!lseg || !fl_cinfo->ops || !fl_cinfo->ops->mark_request_commit)
522 return false;
523 fl_cinfo->ops->mark_request_commit(req, lseg, cinfo, ds_commit_idx);
524 return true;
525}
526
527static inline bool
528pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
529{
530 struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds;
531
532 if (!fl_cinfo || !fl_cinfo->ops || !fl_cinfo->ops->clear_request_commit)
533 return false;
534 fl_cinfo->ops->clear_request_commit(req, cinfo);
535 return true;
536}
537
538static inline int
539pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
540 int max)
541{
542 struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds;
543
544 if (!fl_cinfo || fl_cinfo->nwritten == 0)
545 return 0;
546 return fl_cinfo->ops->scan_commit_lists(cinfo, max);
547}
548
549static inline void
550pnfs_recover_commit_reqs(struct list_head *head, struct nfs_commit_info *cinfo)
551{
552 struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds;
553
554 if (fl_cinfo && fl_cinfo->nwritten != 0)
555 fl_cinfo->ops->recover_commit_reqs(head, cinfo);
556}
557
558static inline struct nfs_page *
559pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo,
560 struct page *page)
561{
562 struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds;
563
564 if (!fl_cinfo->ops || !fl_cinfo->ops->search_commit_reqs)
565 return NULL;
566 return fl_cinfo->ops->search_commit_reqs(cinfo, page);
567}
568
569/* Should the pNFS client commit and return the layout upon a setattr */
570static inline bool
571pnfs_ld_layoutret_on_setattr(struct inode *inode)
572{
573 if (!pnfs_enabled_sb(NFS_SERVER(inode)))
574 return false;
575 return NFS_SERVER(inode)->pnfs_curr_ld->flags &
576 PNFS_LAYOUTRET_ON_SETATTR;
577}
578
579static inline bool
580pnfs_ld_read_whole_page(struct inode *inode)
581{
582 if (!pnfs_enabled_sb(NFS_SERVER(inode)))
583 return false;
584 return NFS_SERVER(inode)->pnfs_curr_ld->flags & PNFS_READ_WHOLE_PAGE;
585}
586
587static inline int
588pnfs_sync_inode(struct inode *inode, bool datasync)
589{
590 if (!pnfs_enabled_sb(NFS_SERVER(inode)))
591 return 0;
592 return NFS_SERVER(inode)->pnfs_curr_ld->sync(inode, datasync);
593}
594
595static inline bool
596pnfs_layoutcommit_outstanding(struct inode *inode)
597{
598 struct nfs_inode *nfsi = NFS_I(inode);
599
600 return test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags) != 0 ||
601 test_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags) != 0;
602}
603
604static inline int pnfs_return_layout(struct inode *ino)
605{
606 struct nfs_inode *nfsi = NFS_I(ino);
607 struct nfs_server *nfss = NFS_SERVER(ino);
608
609 if (pnfs_enabled_sb(nfss) && nfsi->layout) {
610 set_bit(NFS_LAYOUT_RETURN_REQUESTED, &nfsi->layout->plh_flags);
611 return _pnfs_return_layout(ino);
612 }
613
614 return 0;
615}
616
617static inline bool
618pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
619 struct nfs_server *nfss)
620{
621 return (dst && src && src->bm != 0 && nfss->pnfs_curr_ld &&
622 nfss->pnfs_curr_ld->id == src->l_type);
623}
624
625static inline u64
626pnfs_calc_offset_end(u64 offset, u64 len)
627{
628 if (len == NFS4_MAX_UINT64 || len >= NFS4_MAX_UINT64 - offset)
629 return NFS4_MAX_UINT64;
630 return offset + len - 1;
631}
632
633static inline u64
634pnfs_calc_offset_length(u64 offset, u64 end)
635{
636 if (end == NFS4_MAX_UINT64 || end <= offset)
637 return NFS4_MAX_UINT64;
638 return 1 + end - offset;
639}
640
641static inline void
642pnfs_copy_range(struct pnfs_layout_range *dst,
643 const struct pnfs_layout_range *src)
644{
645 memcpy(dst, src, sizeof(*dst));
646}
647
648static inline u64
649pnfs_end_offset(u64 start, u64 len)
650{
651 if (NFS4_MAX_UINT64 - start <= len)
652 return NFS4_MAX_UINT64;
653 return start + len;
654}
655
656/*
657 * Are 2 ranges intersecting?
658 * start1 end1
659 * [----------------------------------)
660 * start2 end2
661 * [----------------)
662 */
663static inline bool
664pnfs_is_range_intersecting(u64 start1, u64 end1, u64 start2, u64 end2)
665{
666 return (end1 == NFS4_MAX_UINT64 || start2 < end1) &&
667 (end2 == NFS4_MAX_UINT64 || start1 < end2);
668}
669
670static inline bool
671pnfs_lseg_range_intersecting(const struct pnfs_layout_range *l1,
672 const struct pnfs_layout_range *l2)
673{
674 u64 end1 = pnfs_end_offset(l1->offset, l1->length);
675 u64 end2 = pnfs_end_offset(l2->offset, l2->length);
676
677 return pnfs_is_range_intersecting(l1->offset, end1, l2->offset, end2);
678}
679
680static inline bool
681pnfs_lseg_request_intersecting(struct pnfs_layout_segment *lseg, struct nfs_page *req)
682{
683 u64 seg_last = pnfs_end_offset(lseg->pls_range.offset, lseg->pls_range.length);
684 u64 req_last = req_offset(req) + req->wb_bytes;
685
686 return pnfs_is_range_intersecting(lseg->pls_range.offset, seg_last,
687 req_offset(req), req_last);
688}
689
690static inline void pnfs_lseg_cancel_io(struct nfs_server *server,
691 struct pnfs_layout_segment *lseg)
692{
693 if (server->pnfs_curr_ld->cancel_io)
694 server->pnfs_curr_ld->cancel_io(lseg);
695}
696
697extern unsigned int layoutstats_timer;
698
699#ifdef NFS_DEBUG
700void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id);
701#else
702static inline void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id)
703{
704}
705
706#endif /* NFS_DEBUG */
707#else /* CONFIG_NFS_V4_1 */
708
709static inline bool nfs_have_layout(struct inode *inode)
710{
711 return false;
712}
713
714static inline void pnfs_destroy_all_layouts(struct nfs_client *clp)
715{
716}
717
718static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
719{
720}
721
722static inline void pnfs_destroy_layout_final(struct nfs_inode *nfsi)
723{
724}
725
726static inline struct pnfs_layout_segment *
727pnfs_get_lseg(struct pnfs_layout_segment *lseg)
728{
729 return NULL;
730}
731
732static inline void pnfs_put_lseg(struct pnfs_layout_segment *lseg)
733{
734}
735
736static inline int pnfs_return_layout(struct inode *ino)
737{
738 return 0;
739}
740
741static inline int pnfs_commit_and_return_layout(struct inode *inode)
742{
743 return 0;
744}
745
746static inline bool
747pnfs_ld_layoutret_on_setattr(struct inode *inode)
748{
749 return false;
750}
751
752static inline bool
753pnfs_ld_read_whole_page(struct inode *inode)
754{
755 return false;
756}
757
758static inline int
759pnfs_sync_inode(struct inode *inode, bool datasync)
760{
761 return 0;
762}
763
764static inline bool
765pnfs_layoutcommit_outstanding(struct inode *inode)
766{
767 return false;
768}
769
770
771static inline bool
772pnfs_roc(struct inode *ino,
773 struct nfs4_layoutreturn_args *args,
774 struct nfs4_layoutreturn_res *res,
775 const struct cred *cred)
776{
777 return false;
778}
779
780static inline int
781pnfs_roc_done(struct rpc_task *task,
782 struct nfs4_layoutreturn_args **argpp,
783 struct nfs4_layoutreturn_res **respp,
784 int *ret)
785{
786 return 0;
787}
788
789static inline void
790pnfs_roc_release(struct nfs4_layoutreturn_args *args,
791 struct nfs4_layoutreturn_res *res,
792 int ret)
793{
794}
795
796static inline bool
797pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task)
798{
799 return false;
800}
801
802static inline void set_pnfs_layoutdriver(struct nfs_server *s,
803 const struct nfs_fh *mntfh,
804 struct nfs_fsinfo *fsinfo)
805{
806}
807
808static inline void unset_pnfs_layoutdriver(struct nfs_server *s)
809{
810}
811
812static inline int
813pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
814 struct nfs_commit_info *cinfo)
815{
816 return PNFS_NOT_ATTEMPTED;
817}
818
819static inline struct pnfs_ds_commit_info *
820pnfs_get_ds_info(struct inode *inode)
821{
822 return NULL;
823}
824
825static inline void
826pnfs_init_ds_commit_info_ops(struct pnfs_ds_commit_info *fl_cinfo, struct inode *inode)
827{
828}
829
830static inline void
831pnfs_init_ds_commit_info(struct pnfs_ds_commit_info *fl_cinfo)
832{
833}
834
835static inline void
836pnfs_release_ds_info(struct pnfs_ds_commit_info *fl_cinfo, struct inode *inode)
837{
838}
839
840static inline bool
841pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
842 struct nfs_commit_info *cinfo, u32 ds_commit_idx)
843{
844 return false;
845}
846
847static inline bool
848pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
849{
850 return false;
851}
852
853static inline int
854pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
855 int max)
856{
857 return 0;
858}
859
860static inline void
861pnfs_recover_commit_reqs(struct list_head *head, struct nfs_commit_info *cinfo)
862{
863}
864
865static inline struct nfs_page *
866pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo,
867 struct page *page)
868{
869 return NULL;
870}
871
872static inline int pnfs_layoutcommit_inode(struct inode *inode, bool sync)
873{
874 return 0;
875}
876
877static inline bool
878pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
879 struct nfs_server *nfss)
880{
881 return false;
882}
883
884static inline struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
885{
886 return NULL;
887}
888
889static inline void nfs4_pnfs_v3_ds_connect_unload(void)
890{
891}
892
893static inline bool nfs4_layout_refresh_old_stateid(nfs4_stateid *dst,
894 struct pnfs_layout_range *dst_range,
895 struct inode *inode)
896{
897 return false;
898}
899
900static inline void pnfs_lgopen_prepare(struct nfs4_opendata *data,
901 struct nfs_open_context *ctx)
902{
903}
904
905static inline void pnfs_parse_lgopen(struct inode *ino,
906 struct nfs4_layoutget *lgp,
907 struct nfs_open_context *ctx)
908{
909}
910
911static inline void nfs4_lgopen_release(struct nfs4_layoutget *lgp)
912{
913}
914
915static inline bool pnfs_layout_is_valid(const struct pnfs_layout_hdr *lo)
916{
917 return false;
918}
919
920#endif /* CONFIG_NFS_V4_1 */
921
922#if IS_ENABLED(CONFIG_NFS_V4_2)
923int pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags);
924#else
925static inline int
926pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags)
927{
928 return 0;
929}
930#endif
931
932#endif /* FS_NFS_PNFS_H */