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