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[linux/fpc-iii.git] / fs / nfs / pnfs.h
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1 /*
2 * pNFS client data structures.
4 * Copyright (c) 2002
5 * The Regents of the University of Michigan
6 * All Rights Reserved
8 * Dean Hildebrand <dhildebz@umich.edu>
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.
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.
30 #ifndef FS_NFS_PNFS_H
31 #define FS_NFS_PNFS_H
33 #include <linux/nfs_fs.h>
34 #include <linux/nfs_page.h>
35 #include <linux/workqueue.h>
37 enum {
38 NFS_LSEG_VALID = 0, /* cleared when lseg is recalled/returned */
39 NFS_LSEG_ROC, /* roc bit received from server */
40 NFS_LSEG_LAYOUTCOMMIT, /* layoutcommit bit set for layoutcommit */
41 NFS_LSEG_LAYOUTRETURN, /* layoutreturn bit set for layoutreturn */
44 /* Individual ip address */
45 struct nfs4_pnfs_ds_addr {
46 struct sockaddr_storage da_addr;
47 size_t da_addrlen;
48 struct list_head da_node; /* nfs4_pnfs_dev_hlist dev_dslist */
49 char *da_remotestr; /* human readable addr+port */
52 struct nfs4_pnfs_ds {
53 struct list_head ds_node; /* nfs4_pnfs_dev_hlist dev_dslist */
54 char *ds_remotestr; /* comma sep list of addrs */
55 struct list_head ds_addrs;
56 struct nfs_client *ds_clp;
57 atomic_t ds_count;
58 unsigned long ds_state;
59 #define NFS4DS_CONNECTING 0 /* ds is establishing connection */
62 struct pnfs_layout_segment {
63 struct list_head pls_list;
64 struct list_head pls_lc_list;
65 struct pnfs_layout_range pls_range;
66 atomic_t pls_refcount;
67 unsigned long pls_flags;
68 struct pnfs_layout_hdr *pls_layout;
69 struct work_struct pls_work;
72 enum pnfs_try_status {
73 PNFS_ATTEMPTED = 0,
74 PNFS_NOT_ATTEMPTED = 1,
75 PNFS_TRY_AGAIN = 2,
78 #ifdef CONFIG_NFS_V4_1
80 #define LAYOUT_NFSV4_1_MODULE_PREFIX "nfs-layouttype4"
83 * Default data server connection timeout and retrans vaules.
84 * Set by module parameters dataserver_timeo and dataserver_retrans.
86 #define NFS4_DEF_DS_TIMEO 600 /* in tenths of a second */
87 #define NFS4_DEF_DS_RETRANS 5
89 /* error codes for internal use */
90 #define NFS4ERR_RESET_TO_MDS 12001
91 #define NFS4ERR_RESET_TO_PNFS 12002
93 enum {
94 NFS_LAYOUT_RO_FAILED = 0, /* get ro layout failed stop trying */
95 NFS_LAYOUT_RW_FAILED, /* get rw layout failed stop trying */
96 NFS_LAYOUT_BULK_RECALL, /* bulk recall affecting layout */
97 NFS_LAYOUT_RETURN, /* Return this layout ASAP */
98 NFS_LAYOUT_RETURN_BEFORE_CLOSE, /* Return this layout before close */
99 NFS_LAYOUT_INVALID_STID, /* layout stateid id is invalid */
100 NFS_LAYOUT_FIRST_LAYOUTGET, /* Serialize first layoutget */
101 NFS_LAYOUT_RETRY_LAYOUTGET, /* Retry layoutget */
104 enum layoutdriver_policy_flags {
105 /* Should the pNFS client commit and return the layout upon truncate to
106 * a smaller size */
107 PNFS_LAYOUTRET_ON_SETATTR = 1 << 0,
108 PNFS_LAYOUTRET_ON_ERROR = 1 << 1,
109 PNFS_READ_WHOLE_PAGE = 1 << 2,
112 struct nfs4_deviceid_node;
114 /* Per-layout driver specific registration structure */
115 struct pnfs_layoutdriver_type {
116 struct list_head pnfs_tblid;
117 const u32 id;
118 const char *name;
119 struct module *owner;
120 unsigned flags;
121 unsigned max_deviceinfo_size;
123 int (*set_layoutdriver) (struct nfs_server *, const struct nfs_fh *);
124 int (*clear_layoutdriver) (struct nfs_server *);
126 struct pnfs_layout_hdr * (*alloc_layout_hdr) (struct inode *inode, gfp_t gfp_flags);
127 void (*free_layout_hdr) (struct pnfs_layout_hdr *);
129 struct pnfs_layout_segment * (*alloc_lseg) (struct pnfs_layout_hdr *layoutid, struct nfs4_layoutget_res *lgr, gfp_t gfp_flags);
130 void (*free_lseg) (struct pnfs_layout_segment *lseg);
131 void (*add_lseg) (struct pnfs_layout_hdr *layoutid,
132 struct pnfs_layout_segment *lseg,
133 struct list_head *free_me);
135 void (*return_range) (struct pnfs_layout_hdr *lo,
136 struct pnfs_layout_range *range);
138 /* test for nfs page cache coalescing */
139 const struct nfs_pageio_ops *pg_read_ops;
140 const struct nfs_pageio_ops *pg_write_ops;
142 struct pnfs_ds_commit_info *(*get_ds_info) (struct inode *inode);
143 void (*mark_request_commit) (struct nfs_page *req,
144 struct pnfs_layout_segment *lseg,
145 struct nfs_commit_info *cinfo,
146 u32 ds_commit_idx);
147 void (*clear_request_commit) (struct nfs_page *req,
148 struct nfs_commit_info *cinfo);
149 int (*scan_commit_lists) (struct nfs_commit_info *cinfo,
150 int max);
151 void (*recover_commit_reqs) (struct list_head *list,
152 struct nfs_commit_info *cinfo);
153 struct nfs_page * (*search_commit_reqs)(struct nfs_commit_info *cinfo,
154 struct page *page);
155 int (*commit_pagelist)(struct inode *inode,
156 struct list_head *mds_pages,
157 int how,
158 struct nfs_commit_info *cinfo);
160 int (*sync)(struct inode *inode, bool datasync);
163 * Return PNFS_ATTEMPTED to indicate the layout code has attempted
164 * I/O, else return PNFS_NOT_ATTEMPTED to fall back to normal NFS
166 enum pnfs_try_status (*read_pagelist)(struct nfs_pgio_header *);
167 enum pnfs_try_status (*write_pagelist)(struct nfs_pgio_header *, int);
169 void (*free_deviceid_node) (struct nfs4_deviceid_node *);
170 struct nfs4_deviceid_node * (*alloc_deviceid_node)
171 (struct nfs_server *server, struct pnfs_device *pdev,
172 gfp_t gfp_flags);
174 void (*encode_layoutreturn) (struct pnfs_layout_hdr *layoutid,
175 struct xdr_stream *xdr,
176 const struct nfs4_layoutreturn_args *args);
178 void (*cleanup_layoutcommit) (struct nfs4_layoutcommit_data *data);
179 int (*prepare_layoutcommit) (struct nfs4_layoutcommit_args *args);
180 void (*encode_layoutcommit) (struct pnfs_layout_hdr *lo,
181 struct xdr_stream *xdr,
182 const struct nfs4_layoutcommit_args *args);
183 int (*prepare_layoutstats) (struct nfs42_layoutstat_args *args);
184 void (*cleanup_layoutstats) (struct nfs42_layoutstat_data *data);
187 struct pnfs_layout_hdr {
188 atomic_t plh_refcount;
189 atomic_t plh_outstanding; /* number of RPCs out */
190 struct list_head plh_layouts; /* other client layouts */
191 struct list_head plh_bulk_destroy;
192 struct list_head plh_segs; /* layout segments list */
193 unsigned long plh_block_lgets; /* block LAYOUTGET if >0 */
194 unsigned long plh_retry_timestamp;
195 unsigned long plh_flags;
196 nfs4_stateid plh_stateid;
197 u32 plh_barrier; /* ignore lower seqids */
198 enum pnfs_iomode plh_return_iomode;
199 loff_t plh_lwb; /* last write byte for layoutcommit */
200 struct rpc_cred *plh_lc_cred; /* layoutcommit cred */
201 struct inode *plh_inode;
204 struct pnfs_device {
205 struct nfs4_deviceid dev_id;
206 unsigned int layout_type;
207 unsigned int mincount;
208 unsigned int maxcount; /* gdia_maxcount */
209 struct page **pages;
210 unsigned int pgbase;
211 unsigned int pglen; /* reply buffer length */
212 unsigned char nocache : 1;/* May not be cached */
215 #define NFS4_PNFS_GETDEVLIST_MAXNUM 16
217 struct pnfs_devicelist {
218 unsigned int eof;
219 unsigned int num_devs;
220 struct nfs4_deviceid dev_id[NFS4_PNFS_GETDEVLIST_MAXNUM];
223 extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *);
224 extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *);
226 /* nfs4proc.c */
227 extern int nfs4_proc_getdeviceinfo(struct nfs_server *server,
228 struct pnfs_device *dev,
229 struct rpc_cred *cred);
230 extern struct pnfs_layout_segment* nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags);
231 extern int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync);
233 /* pnfs.c */
234 void pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo);
235 void pnfs_put_lseg(struct pnfs_layout_segment *lseg);
236 void pnfs_put_lseg_locked(struct pnfs_layout_segment *lseg);
238 void set_pnfs_layoutdriver(struct nfs_server *, const struct nfs_fh *, u32);
239 void unset_pnfs_layoutdriver(struct nfs_server *);
240 void pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *, struct nfs_page *);
241 int pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc);
242 void pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
243 struct nfs_page *req, u64 wb_size);
244 void pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *);
245 int pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc);
246 size_t pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
247 struct nfs_page *prev, struct nfs_page *req);
248 void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg);
249 struct pnfs_layout_segment *pnfs_layout_process(struct nfs4_layoutget *lgp);
250 void pnfs_free_lseg_list(struct list_head *tmp_list);
251 void pnfs_destroy_layout(struct nfs_inode *);
252 void pnfs_destroy_all_layouts(struct nfs_client *);
253 int pnfs_destroy_layouts_byfsid(struct nfs_client *clp,
254 struct nfs_fsid *fsid,
255 bool is_recall);
256 int pnfs_destroy_layouts_byclid(struct nfs_client *clp,
257 bool is_recall);
258 void pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo);
259 void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo,
260 const nfs4_stateid *new,
261 bool update_barrier);
262 int pnfs_choose_layoutget_stateid(nfs4_stateid *dst,
263 struct pnfs_layout_hdr *lo,
264 struct pnfs_layout_range *range,
265 struct nfs4_state *open_state);
266 int pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
267 struct list_head *tmp_list,
268 struct pnfs_layout_range *recall_range);
269 bool pnfs_roc(struct inode *ino);
270 void pnfs_roc_release(struct inode *ino);
271 void pnfs_roc_set_barrier(struct inode *ino, u32 barrier);
272 void pnfs_roc_get_barrier(struct inode *ino, u32 *barrier);
273 bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task);
274 void pnfs_set_layoutcommit(struct inode *, struct pnfs_layout_segment *, loff_t);
275 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data);
276 int pnfs_layoutcommit_inode(struct inode *inode, bool sync);
277 int pnfs_generic_sync(struct inode *inode, bool datasync);
278 int pnfs_nfs_generic_sync(struct inode *inode, bool datasync);
279 int _pnfs_return_layout(struct inode *);
280 int pnfs_commit_and_return_layout(struct inode *);
281 void pnfs_ld_write_done(struct nfs_pgio_header *);
282 void pnfs_ld_read_done(struct nfs_pgio_header *);
283 int pnfs_read_resend_pnfs(struct nfs_pgio_header *);
284 struct pnfs_layout_segment *pnfs_update_layout(struct inode *ino,
285 struct nfs_open_context *ctx,
286 loff_t pos,
287 u64 count,
288 enum pnfs_iomode iomode,
289 gfp_t gfp_flags);
290 void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr *lo);
292 void pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo,
293 struct pnfs_layout_segment *lseg,
294 bool (*is_after)(const struct pnfs_layout_range *lseg_range,
295 const struct pnfs_layout_range *old),
296 bool (*do_merge)(struct pnfs_layout_segment *lseg,
297 struct pnfs_layout_segment *old),
298 struct list_head *free_me);
300 void nfs4_deviceid_mark_client_invalid(struct nfs_client *clp);
301 int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *);
302 int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *);
303 struct nfs4_threshold *pnfs_mdsthreshold_alloc(void);
304 void pnfs_error_mark_layout_for_return(struct inode *inode,
305 struct pnfs_layout_segment *lseg);
306 /* nfs4_deviceid_flags */
307 enum {
308 NFS_DEVICEID_INVALID = 0, /* set when MDS clientid recalled */
309 NFS_DEVICEID_UNAVAILABLE, /* device temporarily unavailable */
310 NFS_DEVICEID_NOCACHE, /* device may not be cached */
313 /* pnfs_dev.c */
314 struct nfs4_deviceid_node {
315 struct hlist_node node;
316 struct hlist_node tmpnode;
317 const struct pnfs_layoutdriver_type *ld;
318 const struct nfs_client *nfs_client;
319 unsigned long flags;
320 unsigned long timestamp_unavailable;
321 struct nfs4_deviceid deviceid;
322 struct rcu_head rcu;
323 atomic_t ref;
326 struct nfs4_deviceid_node *
327 nfs4_find_get_deviceid(struct nfs_server *server,
328 const struct nfs4_deviceid *id, struct rpc_cred *cred,
329 gfp_t gfp_mask);
330 void nfs4_delete_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
331 void nfs4_init_deviceid_node(struct nfs4_deviceid_node *, struct nfs_server *,
332 const struct nfs4_deviceid *);
333 bool nfs4_put_deviceid_node(struct nfs4_deviceid_node *);
334 void nfs4_mark_deviceid_unavailable(struct nfs4_deviceid_node *node);
335 bool nfs4_test_deviceid_unavailable(struct nfs4_deviceid_node *node);
336 void nfs4_deviceid_purge_client(const struct nfs_client *);
338 /* pnfs_nfs.c */
339 void pnfs_generic_clear_request_commit(struct nfs_page *req,
340 struct nfs_commit_info *cinfo);
341 void pnfs_generic_commit_release(void *calldata);
342 void pnfs_generic_prepare_to_resend_writes(struct nfs_commit_data *data);
343 void pnfs_generic_rw_release(void *data);
344 void pnfs_generic_recover_commit_reqs(struct list_head *dst,
345 struct nfs_commit_info *cinfo);
346 int pnfs_generic_commit_pagelist(struct inode *inode,
347 struct list_head *mds_pages,
348 int how,
349 struct nfs_commit_info *cinfo,
350 int (*initiate_commit)(struct nfs_commit_data *data,
351 int how));
352 int pnfs_generic_scan_commit_lists(struct nfs_commit_info *cinfo, int max);
353 void pnfs_generic_write_commit_done(struct rpc_task *task, void *data);
354 void nfs4_pnfs_ds_put(struct nfs4_pnfs_ds *ds);
355 struct nfs4_pnfs_ds *nfs4_pnfs_ds_add(struct list_head *dsaddrs,
356 gfp_t gfp_flags);
357 void nfs4_pnfs_v3_ds_connect_unload(void);
358 void nfs4_pnfs_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds,
359 struct nfs4_deviceid_node *devid, unsigned int timeo,
360 unsigned int retrans, u32 version, u32 minor_version,
361 rpc_authflavor_t au_flavor);
362 struct nfs4_pnfs_ds_addr *nfs4_decode_mp_ds_addr(struct net *net,
363 struct xdr_stream *xdr,
364 gfp_t gfp_flags);
365 void pnfs_layout_mark_request_commit(struct nfs_page *req,
366 struct pnfs_layout_segment *lseg,
367 struct nfs_commit_info *cinfo,
368 u32 ds_commit_idx);
370 static inline bool nfs_have_layout(struct inode *inode)
372 return NFS_I(inode)->layout != NULL;
375 static inline struct nfs4_deviceid_node *
376 nfs4_get_deviceid(struct nfs4_deviceid_node *d)
378 atomic_inc(&d->ref);
379 return d;
382 static inline void pnfs_set_retry_layoutget(struct pnfs_layout_hdr *lo)
384 if (!test_and_set_bit(NFS_LAYOUT_RETRY_LAYOUTGET, &lo->plh_flags))
385 atomic_inc(&lo->plh_refcount);
388 static inline void pnfs_clear_retry_layoutget(struct pnfs_layout_hdr *lo)
390 if (test_and_clear_bit(NFS_LAYOUT_RETRY_LAYOUTGET, &lo->plh_flags)) {
391 atomic_dec(&lo->plh_refcount);
392 /* wake up waiters for LAYOUTRETURN as that is not needed */
393 wake_up_bit(&lo->plh_flags, NFS_LAYOUT_RETURN);
397 static inline bool pnfs_should_retry_layoutget(struct pnfs_layout_hdr *lo)
399 return test_bit(NFS_LAYOUT_RETRY_LAYOUTGET, &lo->plh_flags);
402 static inline struct pnfs_layout_segment *
403 pnfs_get_lseg(struct pnfs_layout_segment *lseg)
405 if (lseg) {
406 atomic_inc(&lseg->pls_refcount);
407 smp_mb__after_atomic();
409 return lseg;
412 /* Return true if a layout driver is being used for this mountpoint */
413 static inline int pnfs_enabled_sb(struct nfs_server *nfss)
415 return nfss->pnfs_curr_ld != NULL;
418 static inline int
419 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
420 struct nfs_commit_info *cinfo)
422 if (cinfo->ds == NULL || cinfo->ds->ncommitting == 0)
423 return PNFS_NOT_ATTEMPTED;
424 return NFS_SERVER(inode)->pnfs_curr_ld->commit_pagelist(inode, mds_pages, how, cinfo);
427 static inline struct pnfs_ds_commit_info *
428 pnfs_get_ds_info(struct inode *inode)
430 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
432 if (ld == NULL || ld->get_ds_info == NULL)
433 return NULL;
434 return ld->get_ds_info(inode);
437 static inline void
438 pnfs_generic_mark_devid_invalid(struct nfs4_deviceid_node *node)
440 set_bit(NFS_DEVICEID_INVALID, &node->flags);
443 static inline bool
444 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
445 struct nfs_commit_info *cinfo, u32 ds_commit_idx)
447 struct inode *inode = d_inode(req->wb_context->dentry);
448 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
450 if (lseg == NULL || ld->mark_request_commit == NULL)
451 return false;
452 ld->mark_request_commit(req, lseg, cinfo, ds_commit_idx);
453 return true;
456 static inline bool
457 pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
459 struct inode *inode = d_inode(req->wb_context->dentry);
460 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
462 if (ld == NULL || ld->clear_request_commit == NULL)
463 return false;
464 ld->clear_request_commit(req, cinfo);
465 return true;
468 static inline int
469 pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
470 int max)
472 if (cinfo->ds == NULL || cinfo->ds->nwritten == 0)
473 return 0;
474 else
475 return NFS_SERVER(inode)->pnfs_curr_ld->scan_commit_lists(cinfo, max);
478 static inline struct nfs_page *
479 pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo,
480 struct page *page)
482 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
484 if (ld == NULL || ld->search_commit_reqs == NULL)
485 return NULL;
486 return ld->search_commit_reqs(cinfo, page);
489 /* Should the pNFS client commit and return the layout upon a setattr */
490 static inline bool
491 pnfs_ld_layoutret_on_setattr(struct inode *inode)
493 if (!pnfs_enabled_sb(NFS_SERVER(inode)))
494 return false;
495 return NFS_SERVER(inode)->pnfs_curr_ld->flags &
496 PNFS_LAYOUTRET_ON_SETATTR;
499 static inline bool
500 pnfs_ld_read_whole_page(struct inode *inode)
502 if (!pnfs_enabled_sb(NFS_SERVER(inode)))
503 return false;
504 return NFS_SERVER(inode)->pnfs_curr_ld->flags & PNFS_READ_WHOLE_PAGE;
507 static inline int
508 pnfs_sync_inode(struct inode *inode, bool datasync)
510 if (!pnfs_enabled_sb(NFS_SERVER(inode)))
511 return 0;
512 return NFS_SERVER(inode)->pnfs_curr_ld->sync(inode, datasync);
515 static inline bool
516 pnfs_layoutcommit_outstanding(struct inode *inode)
518 struct nfs_inode *nfsi = NFS_I(inode);
520 return test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags) != 0 ||
521 test_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags) != 0;
524 static inline int pnfs_return_layout(struct inode *ino)
526 struct nfs_inode *nfsi = NFS_I(ino);
527 struct nfs_server *nfss = NFS_SERVER(ino);
529 if (pnfs_enabled_sb(nfss) && nfsi->layout)
530 return _pnfs_return_layout(ino);
532 return 0;
535 static inline bool
536 pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
537 struct nfs_server *nfss)
539 return (dst && src && src->bm != 0 && nfss->pnfs_curr_ld &&
540 nfss->pnfs_curr_ld->id == src->l_type);
543 static inline u64
544 pnfs_calc_offset_end(u64 offset, u64 len)
546 if (len == NFS4_MAX_UINT64 || len >= NFS4_MAX_UINT64 - offset)
547 return NFS4_MAX_UINT64;
548 return offset + len - 1;
551 static inline u64
552 pnfs_calc_offset_length(u64 offset, u64 end)
554 if (end == NFS4_MAX_UINT64 || end <= offset)
555 return NFS4_MAX_UINT64;
556 return 1 + end - offset;
559 extern unsigned int layoutstats_timer;
561 #ifdef NFS_DEBUG
562 void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id);
563 #else
564 static inline void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id)
568 #endif /* NFS_DEBUG */
569 #else /* CONFIG_NFS_V4_1 */
571 static inline bool nfs_have_layout(struct inode *inode)
573 return false;
576 static inline void pnfs_destroy_all_layouts(struct nfs_client *clp)
580 static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
584 static inline struct pnfs_layout_segment *
585 pnfs_get_lseg(struct pnfs_layout_segment *lseg)
587 return NULL;
590 static inline void pnfs_put_lseg(struct pnfs_layout_segment *lseg)
594 static inline int pnfs_return_layout(struct inode *ino)
596 return 0;
599 static inline int pnfs_commit_and_return_layout(struct inode *inode)
601 return 0;
604 static inline bool
605 pnfs_ld_layoutret_on_setattr(struct inode *inode)
607 return false;
610 static inline bool
611 pnfs_ld_read_whole_page(struct inode *inode)
613 return false;
616 static inline int
617 pnfs_sync_inode(struct inode *inode, bool datasync)
619 return 0;
622 static inline bool
623 pnfs_roc(struct inode *ino)
625 return false;
628 static inline void
629 pnfs_roc_release(struct inode *ino)
633 static inline void
634 pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
638 static inline void
639 pnfs_roc_get_barrier(struct inode *ino, u32 *barrier)
643 static inline bool
644 pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task)
646 return false;
649 static inline void set_pnfs_layoutdriver(struct nfs_server *s,
650 const struct nfs_fh *mntfh, u32 id)
654 static inline void unset_pnfs_layoutdriver(struct nfs_server *s)
658 static inline int
659 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
660 struct nfs_commit_info *cinfo)
662 return PNFS_NOT_ATTEMPTED;
665 static inline struct pnfs_ds_commit_info *
666 pnfs_get_ds_info(struct inode *inode)
668 return NULL;
671 static inline bool
672 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
673 struct nfs_commit_info *cinfo, u32 ds_commit_idx)
675 return false;
678 static inline bool
679 pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
681 return false;
684 static inline int
685 pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
686 int max)
688 return 0;
691 static inline struct nfs_page *
692 pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo,
693 struct page *page)
695 return NULL;
698 static inline int pnfs_layoutcommit_inode(struct inode *inode, bool sync)
700 return 0;
703 static inline bool
704 pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
705 struct nfs_server *nfss)
707 return false;
710 static inline bool
711 pnfs_layoutcommit_outstanding(struct inode *inode)
713 return false;
717 static inline struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
719 return NULL;
722 static inline void nfs4_pnfs_v3_ds_connect_unload(void)
726 #endif /* CONFIG_NFS_V4_1 */
728 #if IS_ENABLED(CONFIG_NFS_V4_2)
729 int pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags);
730 #else
731 static inline int
732 pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags)
734 return 0;
736 #endif
738 #endif /* FS_NFS_PNFS_H */