blob: 965d657086c8bbb866a0fddb09bb8223f5b9ee0e [file] [log] [blame]
rjw1f884582022-01-06 17:20:42 +08001/*
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/nfs_fs.h>
34#include <linux/nfs_page.h>
35#include <linux/workqueue.h>
36
37enum {
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 */
42};
43
44/* Individual ip address */
45struct 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 */
50};
51
52struct 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 */
60};
61
62struct 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 u32 pls_seq;
68 unsigned long pls_flags;
69 struct pnfs_layout_hdr *pls_layout;
70};
71
72enum pnfs_try_status {
73 PNFS_ATTEMPTED = 0,
74 PNFS_NOT_ATTEMPTED = 1,
75 PNFS_TRY_AGAIN = 2,
76};
77
78#ifdef CONFIG_NFS_V4_1
79
80#define LAYOUT_NFSV4_1_MODULE_PREFIX "nfs-layouttype4"
81
82/*
83 * Default data server connection timeout and retrans vaules.
84 * Set by module parameters dataserver_timeo and dataserver_retrans.
85 */
86#define NFS4_DEF_DS_TIMEO 600 /* in tenths of a second */
87#define NFS4_DEF_DS_RETRANS 5
88
89/* error codes for internal use */
90#define NFS4ERR_RESET_TO_MDS 12001
91#define NFS4ERR_RESET_TO_PNFS 12002
92
93enum {
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, /* layoutreturn in progress */
98 NFS_LAYOUT_RETURN_LOCK, /* Serialise layoutreturn */
99 NFS_LAYOUT_RETURN_REQUESTED, /* Return this layout ASAP */
100 NFS_LAYOUT_INVALID_STID, /* layout stateid id is invalid */
101 NFS_LAYOUT_FIRST_LAYOUTGET, /* Serialize first layoutget */
102 NFS_LAYOUT_INODE_FREEING, /* The inode is being freed */
103};
104
105enum layoutdriver_policy_flags {
106 /* Should the pNFS client commit and return the layout upon truncate to
107 * a smaller size */
108 PNFS_LAYOUTRET_ON_SETATTR = 1 << 0,
109 PNFS_LAYOUTRET_ON_ERROR = 1 << 1,
110 PNFS_READ_WHOLE_PAGE = 1 << 2,
111};
112
113struct nfs4_deviceid_node;
114
115/* Per-layout driver specific registration structure */
116struct pnfs_layoutdriver_type {
117 struct list_head pnfs_tblid;
118 const u32 id;
119 const char *name;
120 struct module *owner;
121 unsigned flags;
122 unsigned max_deviceinfo_size;
123
124 int (*set_layoutdriver) (struct nfs_server *, const struct nfs_fh *);
125 int (*clear_layoutdriver) (struct nfs_server *);
126
127 struct pnfs_layout_hdr * (*alloc_layout_hdr) (struct inode *inode, gfp_t gfp_flags);
128 void (*free_layout_hdr) (struct pnfs_layout_hdr *);
129
130 struct pnfs_layout_segment * (*alloc_lseg) (struct pnfs_layout_hdr *layoutid, struct nfs4_layoutget_res *lgr, gfp_t gfp_flags);
131 void (*free_lseg) (struct pnfs_layout_segment *lseg);
132 void (*add_lseg) (struct pnfs_layout_hdr *layoutid,
133 struct pnfs_layout_segment *lseg,
134 struct list_head *free_me);
135
136 void (*return_range) (struct pnfs_layout_hdr *lo,
137 struct pnfs_layout_range *range);
138
139 /* test for nfs page cache coalescing */
140 const struct nfs_pageio_ops *pg_read_ops;
141 const struct nfs_pageio_ops *pg_write_ops;
142
143 struct pnfs_ds_commit_info *(*get_ds_info) (struct inode *inode);
144 void (*mark_request_commit) (struct nfs_page *req,
145 struct pnfs_layout_segment *lseg,
146 struct nfs_commit_info *cinfo,
147 u32 ds_commit_idx);
148 void (*clear_request_commit) (struct nfs_page *req,
149 struct nfs_commit_info *cinfo);
150 int (*scan_commit_lists) (struct nfs_commit_info *cinfo,
151 int max);
152 void (*recover_commit_reqs) (struct list_head *list,
153 struct nfs_commit_info *cinfo);
154 struct nfs_page * (*search_commit_reqs)(struct nfs_commit_info *cinfo,
155 struct page *page);
156 int (*commit_pagelist)(struct inode *inode,
157 struct list_head *mds_pages,
158 int how,
159 struct nfs_commit_info *cinfo);
160
161 int (*sync)(struct inode *inode, bool datasync);
162
163 /*
164 * Return PNFS_ATTEMPTED to indicate the layout code has attempted
165 * I/O, else return PNFS_NOT_ATTEMPTED to fall back to normal NFS
166 */
167 enum pnfs_try_status (*read_pagelist)(struct nfs_pgio_header *);
168 enum pnfs_try_status (*write_pagelist)(struct nfs_pgio_header *, int);
169
170 void (*free_deviceid_node) (struct nfs4_deviceid_node *);
171 struct nfs4_deviceid_node * (*alloc_deviceid_node)
172 (struct nfs_server *server, struct pnfs_device *pdev,
173 gfp_t gfp_flags);
174
175 int (*prepare_layoutreturn) (struct nfs4_layoutreturn_args *);
176
177 void (*cleanup_layoutcommit) (struct nfs4_layoutcommit_data *data);
178 int (*prepare_layoutcommit) (struct nfs4_layoutcommit_args *args);
179 int (*prepare_layoutstats) (struct nfs42_layoutstat_args *args);
180};
181
182struct pnfs_layout_hdr {
183 atomic_t plh_refcount;
184 atomic_t plh_outstanding; /* number of RPCs out */
185 struct list_head plh_layouts; /* other client layouts */
186 struct list_head plh_bulk_destroy;
187 struct list_head plh_segs; /* layout segments list */
188 struct list_head plh_return_segs; /* invalid layout segments */
189 unsigned long plh_block_lgets; /* block LAYOUTGET if >0 */
190 unsigned long plh_retry_timestamp;
191 unsigned long plh_flags;
192 nfs4_stateid plh_stateid;
193 u32 plh_barrier; /* ignore lower seqids */
194 u32 plh_return_seq;
195 enum pnfs_iomode plh_return_iomode;
196 loff_t plh_lwb; /* last write byte for layoutcommit */
197 struct rpc_cred *plh_lc_cred; /* layoutcommit cred */
198 struct inode *plh_inode;
199};
200
201struct pnfs_device {
202 struct nfs4_deviceid dev_id;
203 unsigned int layout_type;
204 unsigned int mincount;
205 unsigned int maxcount; /* gdia_maxcount */
206 struct page **pages;
207 unsigned int pgbase;
208 unsigned int pglen; /* reply buffer length */
209 unsigned char nocache : 1;/* May not be cached */
210};
211
212#define NFS4_PNFS_GETDEVLIST_MAXNUM 16
213
214struct pnfs_devicelist {
215 unsigned int eof;
216 unsigned int num_devs;
217 struct nfs4_deviceid dev_id[NFS4_PNFS_GETDEVLIST_MAXNUM];
218};
219
220extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *);
221extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *);
222
223/* nfs4proc.c */
224extern int nfs4_proc_getdeviceinfo(struct nfs_server *server,
225 struct pnfs_device *dev,
226 struct rpc_cred *cred);
227extern struct pnfs_layout_segment* nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout, gfp_t gfp_flags);
228extern int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync);
229
230/* pnfs.c */
231void pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo);
232void pnfs_put_lseg(struct pnfs_layout_segment *lseg);
233
234void set_pnfs_layoutdriver(struct nfs_server *, const struct nfs_fh *, struct nfs_fsinfo *);
235void unset_pnfs_layoutdriver(struct nfs_server *);
236void pnfs_generic_pg_check_layout(struct nfs_pageio_descriptor *pgio);
237void pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *, struct nfs_page *);
238int pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc);
239void pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
240 struct nfs_page *req, u64 wb_size);
241void pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *);
242int pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc);
243size_t pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
244 struct nfs_page *prev, struct nfs_page *req);
245void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg);
246struct pnfs_layout_segment *pnfs_layout_process(struct nfs4_layoutget *lgp);
247void pnfs_free_lseg_list(struct list_head *tmp_list);
248void pnfs_destroy_layout(struct nfs_inode *);
249void pnfs_destroy_all_layouts(struct nfs_client *);
250int pnfs_destroy_layouts_byfsid(struct nfs_client *clp,
251 struct nfs_fsid *fsid,
252 bool is_recall);
253int pnfs_destroy_layouts_byclid(struct nfs_client *clp,
254 bool is_recall);
255void pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo);
256void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo,
257 const nfs4_stateid *new,
258 bool update_barrier);
259int pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
260 struct list_head *tmp_list,
261 const struct pnfs_layout_range *recall_range,
262 u32 seq);
263int pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo,
264 struct list_head *tmp_list,
265 const struct pnfs_layout_range *recall_range,
266 u32 seq);
267int pnfs_mark_layout_stateid_invalid(struct pnfs_layout_hdr *lo,
268 struct list_head *lseg_list);
269bool pnfs_roc(struct inode *ino,
270 struct nfs4_layoutreturn_args *args,
271 struct nfs4_layoutreturn_res *res,
272 const struct rpc_cred *cred);
273void pnfs_roc_release(struct nfs4_layoutreturn_args *args,
274 struct nfs4_layoutreturn_res *res,
275 int ret);
276bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task);
277void pnfs_set_layoutcommit(struct inode *, struct pnfs_layout_segment *, loff_t);
278void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data);
279int pnfs_layoutcommit_inode(struct inode *inode, bool sync);
280int pnfs_generic_sync(struct inode *inode, bool datasync);
281int pnfs_nfs_generic_sync(struct inode *inode, bool datasync);
282int _pnfs_return_layout(struct inode *);
283int pnfs_commit_and_return_layout(struct inode *);
284void pnfs_ld_write_done(struct nfs_pgio_header *);
285void pnfs_ld_read_done(struct nfs_pgio_header *);
286void pnfs_read_resend_pnfs(struct nfs_pgio_header *);
287struct pnfs_layout_segment *pnfs_update_layout(struct inode *ino,
288 struct nfs_open_context *ctx,
289 loff_t pos,
290 u64 count,
291 enum pnfs_iomode iomode,
292 bool strict_iomode,
293 gfp_t gfp_flags);
294void pnfs_layoutreturn_free_lsegs(struct pnfs_layout_hdr *lo,
295 const nfs4_stateid *arg_stateid,
296 const struct pnfs_layout_range *range,
297 const nfs4_stateid *stateid);
298
299void pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo,
300 struct pnfs_layout_segment *lseg,
301 bool (*is_after)(const struct pnfs_layout_range *lseg_range,
302 const struct pnfs_layout_range *old),
303 bool (*do_merge)(struct pnfs_layout_segment *lseg,
304 struct pnfs_layout_segment *old),
305 struct list_head *free_me);
306
307void nfs4_deviceid_mark_client_invalid(struct nfs_client *clp);
308int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *);
309int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *);
310struct nfs4_threshold *pnfs_mdsthreshold_alloc(void);
311void pnfs_error_mark_layout_for_return(struct inode *inode,
312 struct pnfs_layout_segment *lseg);
313/* nfs4_deviceid_flags */
314enum {
315 NFS_DEVICEID_INVALID = 0, /* set when MDS clientid recalled */
316 NFS_DEVICEID_UNAVAILABLE, /* device temporarily unavailable */
317 NFS_DEVICEID_NOCACHE, /* device may not be cached */
318};
319
320/* pnfs_dev.c */
321struct nfs4_deviceid_node {
322 struct hlist_node node;
323 struct hlist_node tmpnode;
324 const struct pnfs_layoutdriver_type *ld;
325 const struct nfs_client *nfs_client;
326 unsigned long flags;
327 unsigned long timestamp_unavailable;
328 struct nfs4_deviceid deviceid;
329 struct rcu_head rcu;
330 atomic_t ref;
331};
332
333struct nfs4_deviceid_node *
334nfs4_find_get_deviceid(struct nfs_server *server,
335 const struct nfs4_deviceid *id, struct rpc_cred *cred,
336 gfp_t gfp_mask);
337void nfs4_delete_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
338void nfs4_init_deviceid_node(struct nfs4_deviceid_node *, struct nfs_server *,
339 const struct nfs4_deviceid *);
340bool nfs4_put_deviceid_node(struct nfs4_deviceid_node *);
341void nfs4_mark_deviceid_unavailable(struct nfs4_deviceid_node *node);
342bool nfs4_test_deviceid_unavailable(struct nfs4_deviceid_node *node);
343void nfs4_deviceid_purge_client(const struct nfs_client *);
344
345/* pnfs_nfs.c */
346void pnfs_generic_clear_request_commit(struct nfs_page *req,
347 struct nfs_commit_info *cinfo);
348void pnfs_generic_commit_release(void *calldata);
349void pnfs_generic_prepare_to_resend_writes(struct nfs_commit_data *data);
350void pnfs_generic_rw_release(void *data);
351void pnfs_generic_recover_commit_reqs(struct list_head *dst,
352 struct nfs_commit_info *cinfo);
353int pnfs_generic_commit_pagelist(struct inode *inode,
354 struct list_head *mds_pages,
355 int how,
356 struct nfs_commit_info *cinfo,
357 int (*initiate_commit)(struct nfs_commit_data *data,
358 int how));
359int pnfs_generic_scan_commit_lists(struct nfs_commit_info *cinfo, int max);
360void pnfs_generic_write_commit_done(struct rpc_task *task, void *data);
361void nfs4_pnfs_ds_put(struct nfs4_pnfs_ds *ds);
362struct nfs4_pnfs_ds *nfs4_pnfs_ds_add(struct list_head *dsaddrs,
363 gfp_t gfp_flags);
364void nfs4_pnfs_v3_ds_connect_unload(void);
365int nfs4_pnfs_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds,
366 struct nfs4_deviceid_node *devid, unsigned int timeo,
367 unsigned int retrans, u32 version, u32 minor_version);
368struct nfs4_pnfs_ds_addr *nfs4_decode_mp_ds_addr(struct net *net,
369 struct xdr_stream *xdr,
370 gfp_t gfp_flags);
371void pnfs_layout_mark_request_commit(struct nfs_page *req,
372 struct pnfs_layout_segment *lseg,
373 struct nfs_commit_info *cinfo,
374 u32 ds_commit_idx);
375
376static inline bool nfs_have_layout(struct inode *inode)
377{
378 return NFS_I(inode)->layout != NULL;
379}
380
381static inline bool pnfs_layout_is_valid(const struct pnfs_layout_hdr *lo)
382{
383 return test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) == 0;
384}
385
386static inline struct nfs4_deviceid_node *
387nfs4_get_deviceid(struct nfs4_deviceid_node *d)
388{
389 atomic_inc(&d->ref);
390 return d;
391}
392
393static inline struct pnfs_layout_segment *
394pnfs_get_lseg(struct pnfs_layout_segment *lseg)
395{
396 if (lseg) {
397 atomic_inc(&lseg->pls_refcount);
398 smp_mb__after_atomic();
399 }
400 return lseg;
401}
402
403static inline bool
404pnfs_is_valid_lseg(struct pnfs_layout_segment *lseg)
405{
406 return test_bit(NFS_LSEG_VALID, &lseg->pls_flags) != 0;
407}
408
409/* Return true if a layout driver is being used for this mountpoint */
410static inline int pnfs_enabled_sb(struct nfs_server *nfss)
411{
412 return nfss->pnfs_curr_ld != NULL;
413}
414
415static inline int
416pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
417 struct nfs_commit_info *cinfo)
418{
419 if (cinfo->ds == NULL || cinfo->ds->ncommitting == 0)
420 return PNFS_NOT_ATTEMPTED;
421 return NFS_SERVER(inode)->pnfs_curr_ld->commit_pagelist(inode, mds_pages, how, cinfo);
422}
423
424static inline struct pnfs_ds_commit_info *
425pnfs_get_ds_info(struct inode *inode)
426{
427 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
428
429 if (ld == NULL || ld->get_ds_info == NULL)
430 return NULL;
431 return ld->get_ds_info(inode);
432}
433
434static inline void
435pnfs_generic_mark_devid_invalid(struct nfs4_deviceid_node *node)
436{
437 set_bit(NFS_DEVICEID_INVALID, &node->flags);
438}
439
440static inline bool
441pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
442 struct nfs_commit_info *cinfo, u32 ds_commit_idx)
443{
444 struct inode *inode = d_inode(req->wb_context->dentry);
445 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
446
447 if (lseg == NULL || ld->mark_request_commit == NULL)
448 return false;
449 ld->mark_request_commit(req, lseg, cinfo, ds_commit_idx);
450 return true;
451}
452
453static inline bool
454pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
455{
456 struct inode *inode = d_inode(req->wb_context->dentry);
457 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
458
459 if (ld == NULL || ld->clear_request_commit == NULL)
460 return false;
461 ld->clear_request_commit(req, cinfo);
462 return true;
463}
464
465static inline int
466pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
467 int max)
468{
469 if (cinfo->ds == NULL || cinfo->ds->nwritten == 0)
470 return 0;
471 else
472 return NFS_SERVER(inode)->pnfs_curr_ld->scan_commit_lists(cinfo, max);
473}
474
475static inline struct nfs_page *
476pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo,
477 struct page *page)
478{
479 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
480
481 if (ld == NULL || ld->search_commit_reqs == NULL)
482 return NULL;
483 return ld->search_commit_reqs(cinfo, page);
484}
485
486/* Should the pNFS client commit and return the layout upon a setattr */
487static inline bool
488pnfs_ld_layoutret_on_setattr(struct inode *inode)
489{
490 if (!pnfs_enabled_sb(NFS_SERVER(inode)))
491 return false;
492 return NFS_SERVER(inode)->pnfs_curr_ld->flags &
493 PNFS_LAYOUTRET_ON_SETATTR;
494}
495
496static inline bool
497pnfs_ld_read_whole_page(struct inode *inode)
498{
499 if (!pnfs_enabled_sb(NFS_SERVER(inode)))
500 return false;
501 return NFS_SERVER(inode)->pnfs_curr_ld->flags & PNFS_READ_WHOLE_PAGE;
502}
503
504static inline int
505pnfs_sync_inode(struct inode *inode, bool datasync)
506{
507 if (!pnfs_enabled_sb(NFS_SERVER(inode)))
508 return 0;
509 return NFS_SERVER(inode)->pnfs_curr_ld->sync(inode, datasync);
510}
511
512static inline bool
513pnfs_layoutcommit_outstanding(struct inode *inode)
514{
515 struct nfs_inode *nfsi = NFS_I(inode);
516
517 return test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags) != 0 ||
518 test_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags) != 0;
519}
520
521static inline int pnfs_return_layout(struct inode *ino)
522{
523 struct nfs_inode *nfsi = NFS_I(ino);
524 struct nfs_server *nfss = NFS_SERVER(ino);
525
526 if (pnfs_enabled_sb(nfss) && nfsi->layout)
527 return _pnfs_return_layout(ino);
528
529 return 0;
530}
531
532static inline bool
533pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
534 struct nfs_server *nfss)
535{
536 return (dst && src && src->bm != 0 && nfss->pnfs_curr_ld &&
537 nfss->pnfs_curr_ld->id == src->l_type);
538}
539
540static inline u64
541pnfs_calc_offset_end(u64 offset, u64 len)
542{
543 if (len == NFS4_MAX_UINT64 || len >= NFS4_MAX_UINT64 - offset)
544 return NFS4_MAX_UINT64;
545 return offset + len - 1;
546}
547
548static inline u64
549pnfs_calc_offset_length(u64 offset, u64 end)
550{
551 if (end == NFS4_MAX_UINT64 || end <= offset)
552 return NFS4_MAX_UINT64;
553 return 1 + end - offset;
554}
555
556static inline void
557pnfs_copy_range(struct pnfs_layout_range *dst,
558 const struct pnfs_layout_range *src)
559{
560 memcpy(dst, src, sizeof(*dst));
561}
562
563static inline u64
564pnfs_end_offset(u64 start, u64 len)
565{
566 if (NFS4_MAX_UINT64 - start <= len)
567 return NFS4_MAX_UINT64;
568 return start + len;
569}
570
571/*
572 * Are 2 ranges intersecting?
573 * start1 end1
574 * [----------------------------------)
575 * start2 end2
576 * [----------------)
577 */
578static inline bool
579pnfs_is_range_intersecting(u64 start1, u64 end1, u64 start2, u64 end2)
580{
581 return (end1 == NFS4_MAX_UINT64 || start2 < end1) &&
582 (end2 == NFS4_MAX_UINT64 || start1 < end2);
583}
584
585static inline bool
586pnfs_lseg_range_intersecting(const struct pnfs_layout_range *l1,
587 const struct pnfs_layout_range *l2)
588{
589 u64 end1 = pnfs_end_offset(l1->offset, l1->length);
590 u64 end2 = pnfs_end_offset(l2->offset, l2->length);
591
592 return pnfs_is_range_intersecting(l1->offset, end1, l2->offset, end2);
593}
594
595static inline bool
596pnfs_lseg_request_intersecting(struct pnfs_layout_segment *lseg, struct nfs_page *req)
597{
598 u64 seg_last = pnfs_end_offset(lseg->pls_range.offset, lseg->pls_range.length);
599 u64 req_last = req_offset(req) + req->wb_bytes;
600
601 return pnfs_is_range_intersecting(lseg->pls_range.offset, seg_last,
602 req_offset(req), req_last);
603}
604
605extern unsigned int layoutstats_timer;
606
607#ifdef NFS_DEBUG
608void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id);
609#else
610static inline void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id)
611{
612}
613
614#endif /* NFS_DEBUG */
615#else /* CONFIG_NFS_V4_1 */
616
617static inline bool nfs_have_layout(struct inode *inode)
618{
619 return false;
620}
621
622static inline void pnfs_destroy_all_layouts(struct nfs_client *clp)
623{
624}
625
626static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
627{
628}
629
630static inline struct pnfs_layout_segment *
631pnfs_get_lseg(struct pnfs_layout_segment *lseg)
632{
633 return NULL;
634}
635
636static inline void pnfs_put_lseg(struct pnfs_layout_segment *lseg)
637{
638}
639
640static inline int pnfs_return_layout(struct inode *ino)
641{
642 return 0;
643}
644
645static inline int pnfs_commit_and_return_layout(struct inode *inode)
646{
647 return 0;
648}
649
650static inline bool
651pnfs_ld_layoutret_on_setattr(struct inode *inode)
652{
653 return false;
654}
655
656static inline bool
657pnfs_ld_read_whole_page(struct inode *inode)
658{
659 return false;
660}
661
662static inline int
663pnfs_sync_inode(struct inode *inode, bool datasync)
664{
665 return 0;
666}
667
668static inline bool
669pnfs_layoutcommit_outstanding(struct inode *inode)
670{
671 return false;
672}
673
674
675static inline bool
676pnfs_roc(struct inode *ino,
677 struct nfs4_layoutreturn_args *args,
678 struct nfs4_layoutreturn_res *res,
679 const struct rpc_cred *cred)
680{
681 return false;
682}
683
684static inline void
685pnfs_roc_release(struct nfs4_layoutreturn_args *args,
686 struct nfs4_layoutreturn_res *res,
687 int ret)
688{
689}
690
691static inline bool
692pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task)
693{
694 return false;
695}
696
697static inline void set_pnfs_layoutdriver(struct nfs_server *s,
698 const struct nfs_fh *mntfh,
699 struct nfs_fsinfo *fsinfo)
700{
701}
702
703static inline void unset_pnfs_layoutdriver(struct nfs_server *s)
704{
705}
706
707static inline int
708pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
709 struct nfs_commit_info *cinfo)
710{
711 return PNFS_NOT_ATTEMPTED;
712}
713
714static inline struct pnfs_ds_commit_info *
715pnfs_get_ds_info(struct inode *inode)
716{
717 return NULL;
718}
719
720static inline bool
721pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
722 struct nfs_commit_info *cinfo, u32 ds_commit_idx)
723{
724 return false;
725}
726
727static inline bool
728pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
729{
730 return false;
731}
732
733static inline int
734pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
735 int max)
736{
737 return 0;
738}
739
740static inline struct nfs_page *
741pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo,
742 struct page *page)
743{
744 return NULL;
745}
746
747static inline int pnfs_layoutcommit_inode(struct inode *inode, bool sync)
748{
749 return 0;
750}
751
752static inline bool
753pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
754 struct nfs_server *nfss)
755{
756 return false;
757}
758
759static inline struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
760{
761 return NULL;
762}
763
764static inline void nfs4_pnfs_v3_ds_connect_unload(void)
765{
766}
767
768#endif /* CONFIG_NFS_V4_1 */
769
770#if IS_ENABLED(CONFIG_NFS_V4_2)
771int pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags);
772#else
773static inline int
774pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags)
775{
776 return 0;
777}
778#endif
779
780#endif /* FS_NFS_PNFS_H */