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