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1/*
2 * pNFS client data structures.
3 *
4 * Copyright (c) 2002
5 * The Regents of the University of Michigan
6 * All Rights Reserved
7 *
8 * Dean Hildebrand <dhildebz@umich.edu>
9 *
10 * Permission is granted to use, copy, create derivative works, and
11 * redistribute this software and such derivative works for any purpose,
12 * so long as the name of the University of Michigan is not used in
13 * any advertising or publicity pertaining to the use or distribution
14 * of this software without specific, written prior authorization. If
15 * the above copyright notice or any other identification of the
16 * University of Michigan is included in any copy of any portion of
17 * this software, then the disclaimer below must also be included.
18 *
19 * This software is provided as is, without representation or warranty
20 * of any kind either express or implied, including without limitation
21 * the implied warranties of merchantability, fitness for a particular
22 * purpose, or noninfringement. The Regents of the University of
23 * Michigan shall not be liable for any damages, including special,
24 * indirect, incidental, or consequential damages, with respect to any
25 * claim arising out of or in connection with the use of the software,
26 * even if it has been or is hereafter advised of the possibility of
27 * such damages.
28 */
29
30#ifndef FS_NFS_PNFS_H
31#define FS_NFS_PNFS_H
32
33#include <linux/refcount.h>
34#include <linux/nfs_fs.h>
35#include <linux/nfs_page.h>
36#include <linux/workqueue.h>
37
38struct nfs4_opendata;
39
40enum {
41 NFS_LSEG_VALID = 0, /* cleared when lseg is recalled/returned */
42 NFS_LSEG_ROC, /* roc bit received from server */
43 NFS_LSEG_LAYOUTCOMMIT, /* layoutcommit bit set for layoutcommit */
44 NFS_LSEG_LAYOUTRETURN, /* layoutreturn bit set for layoutreturn */
45 NFS_LSEG_UNAVAILABLE, /* unavailable bit set for temporary problem */
46};
47
48/* Individual ip address */
49struct nfs4_pnfs_ds_addr {
50 struct sockaddr_storage da_addr;
51 size_t da_addrlen;
52 struct list_head da_node; /* nfs4_pnfs_dev_hlist dev_dslist */
53 char *da_remotestr; /* human readable addr+port */
54 const char *da_netid;
55 int da_transport;
56};
57
58struct nfs4_pnfs_ds {
59 struct list_head ds_node; /* nfs4_pnfs_dev_hlist dev_dslist */
60 char *ds_remotestr; /* comma sep list of addrs */
61 struct list_head ds_addrs;
62 struct nfs_client *ds_clp;
63 refcount_t ds_count;
64 unsigned long ds_state;
65#define NFS4DS_CONNECTING 0 /* ds is establishing connection */
66};
67
68struct pnfs_layout_segment {
69 struct list_head pls_list;
70 struct list_head pls_lc_list;
71 struct list_head pls_commits;
72 struct pnfs_layout_range pls_range;
73 refcount_t pls_refcount;
74 u32 pls_seq;
75 unsigned long pls_flags;
76 struct pnfs_layout_hdr *pls_layout;
77};
78
79enum pnfs_try_status {
80 PNFS_ATTEMPTED = 0,
81 PNFS_NOT_ATTEMPTED = 1,
82 PNFS_TRY_AGAIN = 2,
83};
84
85/* error codes for internal use */
86#define NFS4ERR_RESET_TO_MDS 12001
87#define NFS4ERR_RESET_TO_PNFS 12002
88
89#ifdef CONFIG_NFS_V4_1
90
91#define LAYOUT_NFSV4_1_MODULE_PREFIX "nfs-layouttype4"
92
93/*
94 * Default data server connection timeout and retrans vaules.
95 * Set by module parameters dataserver_timeo and dataserver_retrans.
96 */
97#define NFS4_DEF_DS_TIMEO 600 /* in tenths of a second */
98#define NFS4_DEF_DS_RETRANS 5
99#define PNFS_DEVICE_RETRY_TIMEOUT (120*HZ)
100
101enum {
102 NFS_LAYOUT_RO_FAILED = 0, /* get ro layout failed stop trying */
103 NFS_LAYOUT_RW_FAILED, /* get rw layout failed stop trying */
104 NFS_LAYOUT_BULK_RECALL, /* bulk recall affecting layout */
105 NFS_LAYOUT_RETURN, /* layoutreturn in progress */
106 NFS_LAYOUT_RETURN_LOCK, /* Serialise layoutreturn */
107 NFS_LAYOUT_RETURN_REQUESTED, /* Return this layout ASAP */
108 NFS_LAYOUT_INVALID_STID, /* layout stateid id is invalid */
109 NFS_LAYOUT_FIRST_LAYOUTGET, /* Serialize first layoutget */
110 NFS_LAYOUT_INODE_FREEING, /* The inode is being freed */
111 NFS_LAYOUT_HASHED, /* The layout visible */
112};
113
114enum layoutdriver_policy_flags {
115 /* Should the pNFS client commit and return the layout upon truncate to
116 * a smaller size */
117 PNFS_LAYOUTRET_ON_SETATTR = 1 << 0,
118 PNFS_LAYOUTRET_ON_ERROR = 1 << 1,
119 PNFS_READ_WHOLE_PAGE = 1 << 2,
120 PNFS_LAYOUTGET_ON_OPEN = 1 << 3,
121};
122
123struct nfs4_deviceid_node;
124
125/* Per-layout driver specific registration structure */
126struct pnfs_layoutdriver_type {
127 struct list_head pnfs_tblid;
128 const u32 id;
129 const char *name;
130 struct module *owner;
131 unsigned flags;
132 unsigned max_deviceinfo_size;
133 unsigned max_layoutget_response;
134
135 int (*set_layoutdriver) (struct nfs_server *, const struct nfs_fh *);
136 int (*clear_layoutdriver) (struct nfs_server *);
137
138 struct pnfs_layout_hdr * (*alloc_layout_hdr) (struct inode *inode, gfp_t gfp_flags);
139 void (*free_layout_hdr) (struct pnfs_layout_hdr *);
140
141 struct pnfs_layout_segment * (*alloc_lseg) (struct pnfs_layout_hdr *layoutid, struct nfs4_layoutget_res *lgr, gfp_t gfp_flags);
142 void (*free_lseg) (struct pnfs_layout_segment *lseg);
143 void (*add_lseg) (struct pnfs_layout_hdr *layoutid,
144 struct pnfs_layout_segment *lseg,
145 struct list_head *free_me);
146
147 void (*return_range) (struct pnfs_layout_hdr *lo,
148 struct pnfs_layout_range *range);
149
150 /* test for nfs page cache coalescing */
151 const struct nfs_pageio_ops *pg_read_ops;
152 const struct nfs_pageio_ops *pg_write_ops;
153
154 struct pnfs_ds_commit_info *(*get_ds_info) (struct inode *inode);
155
156 int (*sync)(struct inode *inode, bool datasync);
157
158 /*
159 * Return PNFS_ATTEMPTED to indicate the layout code has attempted
160 * I/O, else return PNFS_NOT_ATTEMPTED to fall back to normal NFS
161 */
162 enum pnfs_try_status (*read_pagelist)(struct nfs_pgio_header *);
163 enum pnfs_try_status (*write_pagelist)(struct nfs_pgio_header *, int);
164
165 void (*free_deviceid_node) (struct nfs4_deviceid_node *);
166 struct nfs4_deviceid_node * (*alloc_deviceid_node)
167 (struct nfs_server *server, struct pnfs_device *pdev,
168 gfp_t gfp_flags);
169
170 int (*prepare_layoutreturn) (struct nfs4_layoutreturn_args *);
171
172 void (*cleanup_layoutcommit) (struct nfs4_layoutcommit_data *data);
173 int (*prepare_layoutcommit) (struct nfs4_layoutcommit_args *args);
174 int (*prepare_layoutstats) (struct nfs42_layoutstat_args *args);
175};
176
177struct pnfs_commit_ops {
178 void (*setup_ds_info)(struct pnfs_ds_commit_info *,
179 struct pnfs_layout_segment *);
180 void (*release_ds_info)(struct pnfs_ds_commit_info *,
181 struct inode *inode);
182 int (*commit_pagelist)(struct inode *inode,
183 struct list_head *mds_pages,
184 int how,
185 struct nfs_commit_info *cinfo);
186 void (*mark_request_commit) (struct nfs_page *req,
187 struct pnfs_layout_segment *lseg,
188 struct nfs_commit_info *cinfo,
189 u32 ds_commit_idx);
190 void (*clear_request_commit) (struct nfs_page *req,
191 struct nfs_commit_info *cinfo);
192 int (*scan_commit_lists) (struct nfs_commit_info *cinfo,
193 int max);
194 void (*recover_commit_reqs) (struct list_head *list,
195 struct nfs_commit_info *cinfo);
196 struct nfs_page * (*search_commit_reqs)(struct nfs_commit_info *cinfo,
197 struct page *page);
198};
199
200struct pnfs_layout_hdr {
201 refcount_t plh_refcount;
202 atomic_t plh_outstanding; /* number of RPCs out */
203 struct list_head plh_layouts; /* other client layouts */
204 struct list_head plh_bulk_destroy;
205 struct list_head plh_segs; /* layout segments list */
206 struct list_head plh_return_segs; /* invalid layout segments */
207 unsigned long plh_block_lgets; /* block LAYOUTGET if >0 */
208 unsigned long plh_retry_timestamp;
209 unsigned long plh_flags;
210 nfs4_stateid plh_stateid;
211 u32 plh_barrier; /* ignore lower seqids */
212 u32 plh_return_seq;
213 enum pnfs_iomode plh_return_iomode;
214 loff_t plh_lwb; /* last write byte for layoutcommit */
215 const struct cred *plh_lc_cred; /* layoutcommit cred */
216 struct inode *plh_inode;
217 struct rcu_head plh_rcu;
218};
219
220struct pnfs_device {
221 struct nfs4_deviceid dev_id;
222 unsigned int layout_type;
223 unsigned int mincount;
224 unsigned int maxcount; /* gdia_maxcount */
225 struct page **pages;
226 unsigned int pgbase;
227 unsigned int pglen; /* reply buffer length */
228 unsigned char nocache : 1;/* May not be cached */
229};
230
231#define NFS4_PNFS_GETDEVLIST_MAXNUM 16
232
233struct pnfs_devicelist {
234 unsigned int eof;
235 unsigned int num_devs;
236 struct nfs4_deviceid dev_id[NFS4_PNFS_GETDEVLIST_MAXNUM];
237};
238
239extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *);
240extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *);
241
242/* nfs4proc.c */
243extern size_t max_response_pages(struct nfs_server *server);
244extern int nfs4_proc_getdeviceinfo(struct nfs_server *server,
245 struct pnfs_device *dev,
246 const struct cred *cred);
247extern struct pnfs_layout_segment* nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout);
248extern int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync);
249
250/* pnfs.c */
251void pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo);
252void pnfs_put_lseg(struct pnfs_layout_segment *lseg);
253
254void set_pnfs_layoutdriver(struct nfs_server *, const struct nfs_fh *, struct nfs_fsinfo *);
255void unset_pnfs_layoutdriver(struct nfs_server *);
256void pnfs_generic_pg_check_layout(struct nfs_pageio_descriptor *pgio);
257void pnfs_generic_pg_check_range(struct nfs_pageio_descriptor *pgio, struct nfs_page *req);
258void pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *, struct nfs_page *);
259int pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc);
260void pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
261 struct nfs_page *req, u64 wb_size);
262void pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *);
263int pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc);
264size_t pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
265 struct nfs_page *prev, struct nfs_page *req);
266void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg);
267struct pnfs_layout_segment *pnfs_layout_process(struct nfs4_layoutget *lgp);
268void pnfs_layoutget_free(struct nfs4_layoutget *lgp);
269void pnfs_free_lseg_list(struct list_head *tmp_list);
270void pnfs_destroy_layout(struct nfs_inode *);
271void pnfs_destroy_layout_final(struct nfs_inode *);
272void pnfs_destroy_all_layouts(struct nfs_client *);
273int pnfs_destroy_layouts_byfsid(struct nfs_client *clp,
274 struct nfs_fsid *fsid,
275 bool is_recall);
276int pnfs_destroy_layouts_byclid(struct nfs_client *clp,
277 bool is_recall);
278bool nfs4_layout_refresh_old_stateid(nfs4_stateid *dst,
279 struct pnfs_layout_range *dst_range,
280 struct inode *inode);
281void pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo);
282void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo,
283 const nfs4_stateid *new,
284 const struct cred *cred,
285 bool update_barrier);
286int pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
287 struct list_head *tmp_list,
288 const struct pnfs_layout_range *recall_range,
289 u32 seq);
290int pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo,
291 struct list_head *tmp_list,
292 const struct pnfs_layout_range *recall_range,
293 u32 seq);
294int pnfs_mark_layout_stateid_invalid(struct pnfs_layout_hdr *lo,
295 struct list_head *lseg_list);
296bool pnfs_roc(struct inode *ino,
297 struct nfs4_layoutreturn_args *args,
298 struct nfs4_layoutreturn_res *res,
299 const struct cred *cred);
300int pnfs_roc_done(struct rpc_task *task, struct nfs4_layoutreturn_args **argpp,
301 struct nfs4_layoutreturn_res **respp, int *ret);
302void pnfs_roc_release(struct nfs4_layoutreturn_args *args,
303 struct nfs4_layoutreturn_res *res,
304 int ret);
305bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task);
306void pnfs_set_layoutcommit(struct inode *, struct pnfs_layout_segment *, loff_t);
307void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data);
308int pnfs_layoutcommit_inode(struct inode *inode, bool sync);
309int pnfs_generic_sync(struct inode *inode, bool datasync);
310int pnfs_nfs_generic_sync(struct inode *inode, bool datasync);
311int _pnfs_return_layout(struct inode *);
312int pnfs_commit_and_return_layout(struct inode *);
313void pnfs_ld_write_done(struct nfs_pgio_header *);
314void pnfs_ld_read_done(struct nfs_pgio_header *);
315void pnfs_read_resend_pnfs(struct nfs_pgio_header *, unsigned int mirror_idx);
316struct pnfs_layout_segment *pnfs_update_layout(struct inode *ino,
317 struct nfs_open_context *ctx,
318 loff_t pos,
319 u64 count,
320 enum pnfs_iomode iomode,
321 bool strict_iomode,
322 gfp_t gfp_flags);
323void pnfs_layoutreturn_free_lsegs(struct pnfs_layout_hdr *lo,
324 const nfs4_stateid *arg_stateid,
325 const struct pnfs_layout_range *range,
326 const nfs4_stateid *stateid);
327
328void pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo,
329 struct pnfs_layout_segment *lseg,
330 bool (*is_after)(const struct pnfs_layout_range *lseg_range,
331 const struct pnfs_layout_range *old),
332 bool (*do_merge)(struct pnfs_layout_segment *lseg,
333 struct pnfs_layout_segment *old),
334 struct list_head *free_me);
335
336void nfs4_deviceid_mark_client_invalid(struct nfs_client *clp);
337int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *);
338int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *);
339struct nfs4_threshold *pnfs_mdsthreshold_alloc(void);
340void pnfs_error_mark_layout_for_return(struct inode *inode,
341 struct pnfs_layout_segment *lseg);
342void pnfs_layout_return_unused_byclid(struct nfs_client *clp,
343 enum pnfs_iomode iomode);
344
345/* nfs4_deviceid_flags */
346enum {
347 NFS_DEVICEID_INVALID = 0, /* set when MDS clientid recalled */
348 NFS_DEVICEID_UNAVAILABLE, /* device temporarily unavailable */
349 NFS_DEVICEID_NOCACHE, /* device may not be cached */
350};
351
352/* pnfs_dev.c */
353struct nfs4_deviceid_node {
354 struct hlist_node node;
355 struct hlist_node tmpnode;
356 const struct pnfs_layoutdriver_type *ld;
357 const struct nfs_client *nfs_client;
358 unsigned long flags;
359 unsigned long timestamp_unavailable;
360 struct nfs4_deviceid deviceid;
361 struct rcu_head rcu;
362 atomic_t ref;
363};
364
365struct nfs4_deviceid_node *
366nfs4_find_get_deviceid(struct nfs_server *server,
367 const struct nfs4_deviceid *id, const struct cred *cred,
368 gfp_t gfp_mask);
369void nfs4_delete_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
370void nfs4_init_deviceid_node(struct nfs4_deviceid_node *, struct nfs_server *,
371 const struct nfs4_deviceid *);
372bool nfs4_put_deviceid_node(struct nfs4_deviceid_node *);
373void nfs4_mark_deviceid_available(struct nfs4_deviceid_node *node);
374void nfs4_mark_deviceid_unavailable(struct nfs4_deviceid_node *node);
375bool nfs4_test_deviceid_unavailable(struct nfs4_deviceid_node *node);
376void nfs4_deviceid_purge_client(const struct nfs_client *);
377
378/* pnfs_nfs.c */
379struct pnfs_commit_array *pnfs_alloc_commit_array(size_t n, gfp_t gfp_flags);
380void pnfs_free_commit_array(struct pnfs_commit_array *p);
381struct pnfs_commit_array *pnfs_add_commit_array(struct pnfs_ds_commit_info *,
382 struct pnfs_commit_array *,
383 struct pnfs_layout_segment *);
384
385void pnfs_generic_ds_cinfo_release_lseg(struct pnfs_ds_commit_info *fl_cinfo,
386 struct pnfs_layout_segment *lseg);
387void pnfs_generic_ds_cinfo_destroy(struct pnfs_ds_commit_info *fl_cinfo);
388
389void pnfs_generic_clear_request_commit(struct nfs_page *req,
390 struct nfs_commit_info *cinfo);
391void pnfs_generic_commit_release(void *calldata);
392void pnfs_generic_prepare_to_resend_writes(struct nfs_commit_data *data);
393void pnfs_generic_rw_release(void *data);
394void pnfs_generic_recover_commit_reqs(struct list_head *dst,
395 struct nfs_commit_info *cinfo);
396struct nfs_page *pnfs_generic_search_commit_reqs(struct nfs_commit_info *cinfo,
397 struct page *page);
398int pnfs_generic_commit_pagelist(struct inode *inode,
399 struct list_head *mds_pages,
400 int how,
401 struct nfs_commit_info *cinfo,
402 int (*initiate_commit)(struct nfs_commit_data *data,
403 int how));
404int pnfs_generic_scan_commit_lists(struct nfs_commit_info *cinfo, int max);
405void pnfs_generic_write_commit_done(struct rpc_task *task, void *data);
406void nfs4_pnfs_ds_put(struct nfs4_pnfs_ds *ds);
407struct nfs4_pnfs_ds *nfs4_pnfs_ds_add(struct list_head *dsaddrs,
408 gfp_t gfp_flags);
409void nfs4_pnfs_v3_ds_connect_unload(void);
410int nfs4_pnfs_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds,
411 struct nfs4_deviceid_node *devid, unsigned int timeo,
412 unsigned int retrans, u32 version, u32 minor_version);
413struct nfs4_pnfs_ds_addr *nfs4_decode_mp_ds_addr(struct net *net,
414 struct xdr_stream *xdr,
415 gfp_t gfp_flags);
416void pnfs_layout_mark_request_commit(struct nfs_page *req,
417 struct pnfs_layout_segment *lseg,
418 struct nfs_commit_info *cinfo,
419 u32 ds_commit_idx);
420void pnfs_lgopen_prepare(struct nfs4_opendata *data,
421 struct nfs_open_context *ctx);
422void pnfs_parse_lgopen(struct inode *ino, struct nfs4_layoutget *lgp,
423 struct nfs_open_context *ctx);
424void nfs4_lgopen_release(struct nfs4_layoutget *lgp);
425
426static inline bool nfs_have_layout(struct inode *inode)
427{
428 return NFS_I(inode)->layout != NULL;
429}
430
431static inline bool pnfs_layout_is_valid(const struct pnfs_layout_hdr *lo)
432{
433 return test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) == 0;
434}
435
436static inline struct nfs4_deviceid_node *
437nfs4_get_deviceid(struct nfs4_deviceid_node *d)
438{
439 atomic_inc(&d->ref);
440 return d;
441}
442
443static inline struct pnfs_layout_segment *
444pnfs_get_lseg(struct pnfs_layout_segment *lseg)
445{
446 if (lseg) {
447 refcount_inc(&lseg->pls_refcount);
448 smp_mb__after_atomic();
449 }
450 return lseg;
451}
452
453static inline bool
454pnfs_is_valid_lseg(struct pnfs_layout_segment *lseg)
455{
456 return test_bit(NFS_LSEG_VALID, &lseg->pls_flags) != 0;
457}
458
459/* Return true if a layout driver is being used for this mountpoint */
460static inline int pnfs_enabled_sb(struct nfs_server *nfss)
461{
462 return nfss->pnfs_curr_ld != NULL;
463}
464
465static inline int
466pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
467 struct nfs_commit_info *cinfo)
468{
469 struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds;
470
471 if (fl_cinfo == NULL || fl_cinfo->ncommitting == 0)
472 return PNFS_NOT_ATTEMPTED;
473 return fl_cinfo->ops->commit_pagelist(inode, mds_pages, how, cinfo);
474}
475
476static inline struct pnfs_ds_commit_info *
477pnfs_get_ds_info(struct inode *inode)
478{
479 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
480
481 if (ld == NULL || ld->get_ds_info == NULL)
482 return NULL;
483 return ld->get_ds_info(inode);
484}
485
486static inline void
487pnfs_init_ds_commit_info_ops(struct pnfs_ds_commit_info *fl_cinfo, struct inode *inode)
488{
489 struct pnfs_ds_commit_info *inode_cinfo = pnfs_get_ds_info(inode);
490 if (inode_cinfo != NULL)
491 fl_cinfo->ops = inode_cinfo->ops;
492}
493
494static inline void
495pnfs_init_ds_commit_info(struct pnfs_ds_commit_info *fl_cinfo)
496{
497 INIT_LIST_HEAD(&fl_cinfo->commits);
498 fl_cinfo->ops = NULL;
499}
500
501static inline void
502pnfs_release_ds_info(struct pnfs_ds_commit_info *fl_cinfo, struct inode *inode)
503{
504 if (fl_cinfo->ops != NULL && fl_cinfo->ops->release_ds_info != NULL)
505 fl_cinfo->ops->release_ds_info(fl_cinfo, inode);
506}
507
508static inline void
509pnfs_generic_mark_devid_invalid(struct nfs4_deviceid_node *node)
510{
511 set_bit(NFS_DEVICEID_INVALID, &node->flags);
512}
513
514static inline bool
515pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
516 struct nfs_commit_info *cinfo, u32 ds_commit_idx)
517{
518 struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds;
519
520 if (!lseg || !fl_cinfo->ops->mark_request_commit)
521 return false;
522 fl_cinfo->ops->mark_request_commit(req, lseg, cinfo, ds_commit_idx);
523 return true;
524}
525
526static inline bool
527pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
528{
529 struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds;
530
531 if (!fl_cinfo || !fl_cinfo->ops || !fl_cinfo->ops->clear_request_commit)
532 return false;
533 fl_cinfo->ops->clear_request_commit(req, cinfo);
534 return true;
535}
536
537static inline int
538pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
539 int max)
540{
541 struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds;
542
543 if (!fl_cinfo || fl_cinfo->nwritten == 0)
544 return 0;
545 return fl_cinfo->ops->scan_commit_lists(cinfo, max);
546}
547
548static inline void
549pnfs_recover_commit_reqs(struct list_head *head, struct nfs_commit_info *cinfo)
550{
551 struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds;
552
553 if (fl_cinfo && fl_cinfo->nwritten != 0)
554 fl_cinfo->ops->recover_commit_reqs(head, cinfo);
555}
556
557static inline struct nfs_page *
558pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo,
559 struct page *page)
560{
561 struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds;
562
563 if (!fl_cinfo->ops || !fl_cinfo->ops->search_commit_reqs)
564 return NULL;
565 return fl_cinfo->ops->search_commit_reqs(cinfo, page);
566}
567
568/* Should the pNFS client commit and return the layout upon a setattr */
569static inline bool
570pnfs_ld_layoutret_on_setattr(struct inode *inode)
571{
572 if (!pnfs_enabled_sb(NFS_SERVER(inode)))
573 return false;
574 return NFS_SERVER(inode)->pnfs_curr_ld->flags &
575 PNFS_LAYOUTRET_ON_SETATTR;
576}
577
578static inline bool
579pnfs_ld_read_whole_page(struct inode *inode)
580{
581 if (!pnfs_enabled_sb(NFS_SERVER(inode)))
582 return false;
583 return NFS_SERVER(inode)->pnfs_curr_ld->flags & PNFS_READ_WHOLE_PAGE;
584}
585
586static inline int
587pnfs_sync_inode(struct inode *inode, bool datasync)
588{
589 if (!pnfs_enabled_sb(NFS_SERVER(inode)))
590 return 0;
591 return NFS_SERVER(inode)->pnfs_curr_ld->sync(inode, datasync);
592}
593
594static inline bool
595pnfs_layoutcommit_outstanding(struct inode *inode)
596{
597 struct nfs_inode *nfsi = NFS_I(inode);
598
599 return test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags) != 0 ||
600 test_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags) != 0;
601}
602
603static inline int pnfs_return_layout(struct inode *ino)
604{
605 struct nfs_inode *nfsi = NFS_I(ino);
606 struct nfs_server *nfss = NFS_SERVER(ino);
607
608 if (pnfs_enabled_sb(nfss) && nfsi->layout) {
609 set_bit(NFS_LAYOUT_RETURN_REQUESTED, &nfsi->layout->plh_flags);
610 return _pnfs_return_layout(ino);
611 }
612
613 return 0;
614}
615
616static inline bool
617pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
618 struct nfs_server *nfss)
619{
620 return (dst && src && src->bm != 0 && nfss->pnfs_curr_ld &&
621 nfss->pnfs_curr_ld->id == src->l_type);
622}
623
624static inline u64
625pnfs_calc_offset_end(u64 offset, u64 len)
626{
627 if (len == NFS4_MAX_UINT64 || len >= NFS4_MAX_UINT64 - offset)
628 return NFS4_MAX_UINT64;
629 return offset + len - 1;
630}
631
632static inline u64
633pnfs_calc_offset_length(u64 offset, u64 end)
634{
635 if (end == NFS4_MAX_UINT64 || end <= offset)
636 return NFS4_MAX_UINT64;
637 return 1 + end - offset;
638}
639
640static inline void
641pnfs_copy_range(struct pnfs_layout_range *dst,
642 const struct pnfs_layout_range *src)
643{
644 memcpy(dst, src, sizeof(*dst));
645}
646
647static inline u64
648pnfs_end_offset(u64 start, u64 len)
649{
650 if (NFS4_MAX_UINT64 - start <= len)
651 return NFS4_MAX_UINT64;
652 return start + len;
653}
654
655/*
656 * Are 2 ranges intersecting?
657 * start1 end1
658 * [----------------------------------)
659 * start2 end2
660 * [----------------)
661 */
662static inline bool
663pnfs_is_range_intersecting(u64 start1, u64 end1, u64 start2, u64 end2)
664{
665 return (end1 == NFS4_MAX_UINT64 || start2 < end1) &&
666 (end2 == NFS4_MAX_UINT64 || start1 < end2);
667}
668
669static inline bool
670pnfs_lseg_range_intersecting(const struct pnfs_layout_range *l1,
671 const struct pnfs_layout_range *l2)
672{
673 u64 end1 = pnfs_end_offset(l1->offset, l1->length);
674 u64 end2 = pnfs_end_offset(l2->offset, l2->length);
675
676 return pnfs_is_range_intersecting(l1->offset, end1, l2->offset, end2);
677}
678
679static inline bool
680pnfs_lseg_request_intersecting(struct pnfs_layout_segment *lseg, struct nfs_page *req)
681{
682 u64 seg_last = pnfs_end_offset(lseg->pls_range.offset, lseg->pls_range.length);
683 u64 req_last = req_offset(req) + req->wb_bytes;
684
685 return pnfs_is_range_intersecting(lseg->pls_range.offset, seg_last,
686 req_offset(req), req_last);
687}
688
689extern unsigned int layoutstats_timer;
690
691#ifdef NFS_DEBUG
692void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id);
693#else
694static inline void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id)
695{
696}
697
698#endif /* NFS_DEBUG */
699#else /* CONFIG_NFS_V4_1 */
700
701static inline bool nfs_have_layout(struct inode *inode)
702{
703 return false;
704}
705
706static inline void pnfs_destroy_all_layouts(struct nfs_client *clp)
707{
708}
709
710static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
711{
712}
713
714static inline void pnfs_destroy_layout_final(struct nfs_inode *nfsi)
715{
716}
717
718static inline struct pnfs_layout_segment *
719pnfs_get_lseg(struct pnfs_layout_segment *lseg)
720{
721 return NULL;
722}
723
724static inline void pnfs_put_lseg(struct pnfs_layout_segment *lseg)
725{
726}
727
728static inline int pnfs_return_layout(struct inode *ino)
729{
730 return 0;
731}
732
733static inline int pnfs_commit_and_return_layout(struct inode *inode)
734{
735 return 0;
736}
737
738static inline bool
739pnfs_ld_layoutret_on_setattr(struct inode *inode)
740{
741 return false;
742}
743
744static inline bool
745pnfs_ld_read_whole_page(struct inode *inode)
746{
747 return false;
748}
749
750static inline int
751pnfs_sync_inode(struct inode *inode, bool datasync)
752{
753 return 0;
754}
755
756static inline bool
757pnfs_layoutcommit_outstanding(struct inode *inode)
758{
759 return false;
760}
761
762
763static inline bool
764pnfs_roc(struct inode *ino,
765 struct nfs4_layoutreturn_args *args,
766 struct nfs4_layoutreturn_res *res,
767 const struct cred *cred)
768{
769 return false;
770}
771
772static inline int
773pnfs_roc_done(struct rpc_task *task,
774 struct nfs4_layoutreturn_args **argpp,
775 struct nfs4_layoutreturn_res **respp,
776 int *ret)
777{
778 return 0;
779}
780
781static inline void
782pnfs_roc_release(struct nfs4_layoutreturn_args *args,
783 struct nfs4_layoutreturn_res *res,
784 int ret)
785{
786}
787
788static inline bool
789pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task)
790{
791 return false;
792}
793
794static inline void set_pnfs_layoutdriver(struct nfs_server *s,
795 const struct nfs_fh *mntfh,
796 struct nfs_fsinfo *fsinfo)
797{
798}
799
800static inline void unset_pnfs_layoutdriver(struct nfs_server *s)
801{
802}
803
804static inline int
805pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
806 struct nfs_commit_info *cinfo)
807{
808 return PNFS_NOT_ATTEMPTED;
809}
810
811static inline struct pnfs_ds_commit_info *
812pnfs_get_ds_info(struct inode *inode)
813{
814 return NULL;
815}
816
817static inline void
818pnfs_init_ds_commit_info_ops(struct pnfs_ds_commit_info *fl_cinfo, struct inode *inode)
819{
820}
821
822static inline void
823pnfs_init_ds_commit_info(struct pnfs_ds_commit_info *fl_cinfo)
824{
825}
826
827static inline void
828pnfs_release_ds_info(struct pnfs_ds_commit_info *fl_cinfo, struct inode *inode)
829{
830}
831
832static inline bool
833pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
834 struct nfs_commit_info *cinfo, u32 ds_commit_idx)
835{
836 return false;
837}
838
839static inline bool
840pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
841{
842 return false;
843}
844
845static inline int
846pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
847 int max)
848{
849 return 0;
850}
851
852static inline void
853pnfs_recover_commit_reqs(struct list_head *head, struct nfs_commit_info *cinfo)
854{
855}
856
857static inline struct nfs_page *
858pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo,
859 struct page *page)
860{
861 return NULL;
862}
863
864static inline int pnfs_layoutcommit_inode(struct inode *inode, bool sync)
865{
866 return 0;
867}
868
869static inline bool
870pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
871 struct nfs_server *nfss)
872{
873 return false;
874}
875
876static inline struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
877{
878 return NULL;
879}
880
881static inline void nfs4_pnfs_v3_ds_connect_unload(void)
882{
883}
884
885static inline bool nfs4_layout_refresh_old_stateid(nfs4_stateid *dst,
886 struct pnfs_layout_range *dst_range,
887 struct inode *inode)
888{
889 return false;
890}
891
892static inline void pnfs_lgopen_prepare(struct nfs4_opendata *data,
893 struct nfs_open_context *ctx)
894{
895}
896
897static inline void pnfs_parse_lgopen(struct inode *ino,
898 struct nfs4_layoutget *lgp,
899 struct nfs_open_context *ctx)
900{
901}
902
903static inline void nfs4_lgopen_release(struct nfs4_layoutget *lgp)
904{
905}
906
907static inline bool pnfs_layout_is_valid(const struct pnfs_layout_hdr *lo)
908{
909 return false;
910}
911
912#endif /* CONFIG_NFS_V4_1 */
913
914#if IS_ENABLED(CONFIG_NFS_V4_2)
915int pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags);
916#else
917static inline int
918pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags)
919{
920 return 0;
921}
922#endif
923
924#endif /* FS_NFS_PNFS_H */
1/*
2 * pNFS client data structures.
3 *
4 * Copyright (c) 2002
5 * The Regents of the University of Michigan
6 * All Rights Reserved
7 *
8 * Dean Hildebrand <dhildebz@umich.edu>
9 *
10 * Permission is granted to use, copy, create derivative works, and
11 * redistribute this software and such derivative works for any purpose,
12 * so long as the name of the University of Michigan is not used in
13 * any advertising or publicity pertaining to the use or distribution
14 * of this software without specific, written prior authorization. If
15 * the above copyright notice or any other identification of the
16 * University of Michigan is included in any copy of any portion of
17 * this software, then the disclaimer below must also be included.
18 *
19 * This software is provided as is, without representation or warranty
20 * of any kind either express or implied, including without limitation
21 * the implied warranties of merchantability, fitness for a particular
22 * purpose, or noninfringement. The Regents of the University of
23 * Michigan shall not be liable for any damages, including special,
24 * indirect, incidental, or consequential damages, with respect to any
25 * claim arising out of or in connection with the use of the software,
26 * even if it has been or is hereafter advised of the possibility of
27 * such damages.
28 */
29
30#ifndef FS_NFS_PNFS_H
31#define FS_NFS_PNFS_H
32
33#include <linux/nfs_fs.h>
34#include <linux/nfs_page.h>
35
36enum {
37 NFS_LSEG_VALID = 0, /* cleared when lseg is recalled/returned */
38 NFS_LSEG_ROC, /* roc bit received from server */
39 NFS_LSEG_LAYOUTCOMMIT, /* layoutcommit bit set for layoutcommit */
40};
41
42struct pnfs_layout_segment {
43 struct list_head pls_list;
44 struct list_head pls_lc_list;
45 struct pnfs_layout_range pls_range;
46 atomic_t pls_refcount;
47 unsigned long pls_flags;
48 struct pnfs_layout_hdr *pls_layout;
49};
50
51enum pnfs_try_status {
52 PNFS_ATTEMPTED = 0,
53 PNFS_NOT_ATTEMPTED = 1,
54};
55
56#ifdef CONFIG_NFS_V4_1
57
58#define LAYOUT_NFSV4_1_MODULE_PREFIX "nfs-layouttype4"
59
60enum {
61 NFS_LAYOUT_RO_FAILED = 0, /* get ro layout failed stop trying */
62 NFS_LAYOUT_RW_FAILED, /* get rw layout failed stop trying */
63 NFS_LAYOUT_BULK_RECALL, /* bulk recall affecting layout */
64 NFS_LAYOUT_ROC, /* some lseg had roc bit set */
65 NFS_LAYOUT_DESTROYED, /* no new use of layout allowed */
66};
67
68enum layoutdriver_policy_flags {
69 /* Should the pNFS client commit and return the layout upon a setattr */
70 PNFS_LAYOUTRET_ON_SETATTR = 1 << 0,
71};
72
73struct nfs4_deviceid_node;
74
75/* Per-layout driver specific registration structure */
76struct pnfs_layoutdriver_type {
77 struct list_head pnfs_tblid;
78 const u32 id;
79 const char *name;
80 struct module *owner;
81 unsigned flags;
82
83 int (*set_layoutdriver) (struct nfs_server *, const struct nfs_fh *);
84 int (*clear_layoutdriver) (struct nfs_server *);
85
86 struct pnfs_layout_hdr * (*alloc_layout_hdr) (struct inode *inode, gfp_t gfp_flags);
87 void (*free_layout_hdr) (struct pnfs_layout_hdr *);
88
89 struct pnfs_layout_segment * (*alloc_lseg) (struct pnfs_layout_hdr *layoutid, struct nfs4_layoutget_res *lgr, gfp_t gfp_flags);
90 void (*free_lseg) (struct pnfs_layout_segment *lseg);
91
92 /* test for nfs page cache coalescing */
93 const struct nfs_pageio_ops *pg_read_ops;
94 const struct nfs_pageio_ops *pg_write_ops;
95
96 /* Returns true if layoutdriver wants to divert this request to
97 * driver's commit routine.
98 */
99 bool (*mark_pnfs_commit)(struct pnfs_layout_segment *lseg);
100 struct list_head * (*choose_commit_list) (struct nfs_page *req);
101 int (*commit_pagelist)(struct inode *inode, struct list_head *mds_pages, int how);
102
103 /*
104 * Return PNFS_ATTEMPTED to indicate the layout code has attempted
105 * I/O, else return PNFS_NOT_ATTEMPTED to fall back to normal NFS
106 */
107 enum pnfs_try_status (*read_pagelist) (struct nfs_read_data *nfs_data);
108 enum pnfs_try_status (*write_pagelist) (struct nfs_write_data *nfs_data, int how);
109
110 void (*free_deviceid_node) (struct nfs4_deviceid_node *);
111
112 void (*encode_layoutreturn) (struct pnfs_layout_hdr *layoutid,
113 struct xdr_stream *xdr,
114 const struct nfs4_layoutreturn_args *args);
115
116 void (*cleanup_layoutcommit) (struct nfs4_layoutcommit_data *data);
117
118 void (*encode_layoutcommit) (struct pnfs_layout_hdr *layoutid,
119 struct xdr_stream *xdr,
120 const struct nfs4_layoutcommit_args *args);
121};
122
123struct pnfs_layout_hdr {
124 atomic_t plh_refcount;
125 struct list_head plh_layouts; /* other client layouts */
126 struct list_head plh_bulk_recall; /* clnt list of bulk recalls */
127 struct list_head plh_segs; /* layout segments list */
128 nfs4_stateid plh_stateid;
129 atomic_t plh_outstanding; /* number of RPCs out */
130 unsigned long plh_block_lgets; /* block LAYOUTGET if >0 */
131 u32 plh_barrier; /* ignore lower seqids */
132 unsigned long plh_flags;
133 loff_t plh_lwb; /* last write byte for layoutcommit */
134 struct rpc_cred *plh_lc_cred; /* layoutcommit cred */
135 struct inode *plh_inode;
136};
137
138struct pnfs_device {
139 struct nfs4_deviceid dev_id;
140 unsigned int layout_type;
141 unsigned int mincount;
142 struct page **pages;
143 unsigned int pgbase;
144 unsigned int pglen;
145};
146
147#define NFS4_PNFS_GETDEVLIST_MAXNUM 16
148
149struct pnfs_devicelist {
150 unsigned int eof;
151 unsigned int num_devs;
152 struct nfs4_deviceid dev_id[NFS4_PNFS_GETDEVLIST_MAXNUM];
153};
154
155extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *);
156extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *);
157
158/* nfs4proc.c */
159extern int nfs4_proc_getdevicelist(struct nfs_server *server,
160 const struct nfs_fh *fh,
161 struct pnfs_devicelist *devlist);
162extern int nfs4_proc_getdeviceinfo(struct nfs_server *server,
163 struct pnfs_device *dev);
164extern int nfs4_proc_layoutget(struct nfs4_layoutget *lgp);
165extern int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp);
166
167/* pnfs.c */
168void get_layout_hdr(struct pnfs_layout_hdr *lo);
169void put_lseg(struct pnfs_layout_segment *lseg);
170
171bool pnfs_pageio_init_read(struct nfs_pageio_descriptor *, struct inode *);
172bool pnfs_pageio_init_write(struct nfs_pageio_descriptor *, struct inode *, int);
173
174void set_pnfs_layoutdriver(struct nfs_server *, const struct nfs_fh *, u32);
175void unset_pnfs_layoutdriver(struct nfs_server *);
176void pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *, struct nfs_page *);
177int pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc);
178void pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *, struct nfs_page *);
179int pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc);
180bool pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, struct nfs_page *req);
181int pnfs_layout_process(struct nfs4_layoutget *lgp);
182void pnfs_free_lseg_list(struct list_head *tmp_list);
183void pnfs_destroy_layout(struct nfs_inode *);
184void pnfs_destroy_all_layouts(struct nfs_client *);
185void put_layout_hdr(struct pnfs_layout_hdr *lo);
186void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo,
187 const nfs4_stateid *new,
188 bool update_barrier);
189int pnfs_choose_layoutget_stateid(nfs4_stateid *dst,
190 struct pnfs_layout_hdr *lo,
191 struct nfs4_state *open_state);
192int mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
193 struct list_head *tmp_list,
194 struct pnfs_layout_range *recall_range);
195bool pnfs_roc(struct inode *ino);
196void pnfs_roc_release(struct inode *ino);
197void pnfs_roc_set_barrier(struct inode *ino, u32 barrier);
198bool pnfs_roc_drain(struct inode *ino, u32 *barrier);
199void pnfs_set_layoutcommit(struct nfs_write_data *wdata);
200void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data);
201int pnfs_layoutcommit_inode(struct inode *inode, bool sync);
202int _pnfs_return_layout(struct inode *);
203int pnfs_ld_write_done(struct nfs_write_data *);
204int pnfs_ld_read_done(struct nfs_read_data *);
205struct pnfs_layout_segment *pnfs_update_layout(struct inode *ino,
206 struct nfs_open_context *ctx,
207 loff_t pos,
208 u64 count,
209 enum pnfs_iomode iomode,
210 gfp_t gfp_flags);
211
212void nfs4_deviceid_mark_client_invalid(struct nfs_client *clp);
213
214/* nfs4_deviceid_flags */
215enum {
216 NFS_DEVICEID_INVALID = 0, /* set when MDS clientid recalled */
217};
218
219/* pnfs_dev.c */
220struct nfs4_deviceid_node {
221 struct hlist_node node;
222 struct hlist_node tmpnode;
223 const struct pnfs_layoutdriver_type *ld;
224 const struct nfs_client *nfs_client;
225 unsigned long flags;
226 struct nfs4_deviceid deviceid;
227 atomic_t ref;
228};
229
230void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id);
231struct nfs4_deviceid_node *nfs4_find_get_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
232void nfs4_delete_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
233void nfs4_init_deviceid_node(struct nfs4_deviceid_node *,
234 const struct pnfs_layoutdriver_type *,
235 const struct nfs_client *,
236 const struct nfs4_deviceid *);
237struct nfs4_deviceid_node *nfs4_insert_deviceid_node(struct nfs4_deviceid_node *);
238bool nfs4_put_deviceid_node(struct nfs4_deviceid_node *);
239void nfs4_deviceid_purge_client(const struct nfs_client *);
240
241static inline int lo_fail_bit(u32 iomode)
242{
243 return iomode == IOMODE_RW ?
244 NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
245}
246
247static inline struct pnfs_layout_segment *
248get_lseg(struct pnfs_layout_segment *lseg)
249{
250 if (lseg) {
251 atomic_inc(&lseg->pls_refcount);
252 smp_mb__after_atomic_inc();
253 }
254 return lseg;
255}
256
257/* Return true if a layout driver is being used for this mountpoint */
258static inline int pnfs_enabled_sb(struct nfs_server *nfss)
259{
260 return nfss->pnfs_curr_ld != NULL;
261}
262
263static inline void
264pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg)
265{
266 if (lseg) {
267 struct pnfs_layoutdriver_type *ld;
268
269 ld = NFS_SERVER(req->wb_page->mapping->host)->pnfs_curr_ld;
270 if (ld->mark_pnfs_commit && ld->mark_pnfs_commit(lseg)) {
271 set_bit(PG_PNFS_COMMIT, &req->wb_flags);
272 req->wb_commit_lseg = get_lseg(lseg);
273 }
274 }
275}
276
277static inline int
278pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how)
279{
280 if (!test_and_clear_bit(NFS_INO_PNFS_COMMIT, &NFS_I(inode)->flags))
281 return PNFS_NOT_ATTEMPTED;
282 return NFS_SERVER(inode)->pnfs_curr_ld->commit_pagelist(inode, mds_pages, how);
283}
284
285static inline struct list_head *
286pnfs_choose_commit_list(struct nfs_page *req, struct list_head *mds)
287{
288 struct list_head *rv;
289
290 if (test_and_clear_bit(PG_PNFS_COMMIT, &req->wb_flags)) {
291 struct inode *inode = req->wb_commit_lseg->pls_layout->plh_inode;
292
293 set_bit(NFS_INO_PNFS_COMMIT, &NFS_I(inode)->flags);
294 rv = NFS_SERVER(inode)->pnfs_curr_ld->choose_commit_list(req);
295 /* matched by ref taken when PG_PNFS_COMMIT is set */
296 put_lseg(req->wb_commit_lseg);
297 } else
298 rv = mds;
299 return rv;
300}
301
302static inline void pnfs_clear_request_commit(struct nfs_page *req)
303{
304 if (test_and_clear_bit(PG_PNFS_COMMIT, &req->wb_flags))
305 put_lseg(req->wb_commit_lseg);
306}
307
308/* Should the pNFS client commit and return the layout upon a setattr */
309static inline bool
310pnfs_ld_layoutret_on_setattr(struct inode *inode)
311{
312 if (!pnfs_enabled_sb(NFS_SERVER(inode)))
313 return false;
314 return NFS_SERVER(inode)->pnfs_curr_ld->flags &
315 PNFS_LAYOUTRET_ON_SETATTR;
316}
317
318static inline int pnfs_return_layout(struct inode *ino)
319{
320 struct nfs_inode *nfsi = NFS_I(ino);
321 struct nfs_server *nfss = NFS_SERVER(ino);
322
323 if (pnfs_enabled_sb(nfss) && nfsi->layout)
324 return _pnfs_return_layout(ino);
325
326 return 0;
327}
328
329#else /* CONFIG_NFS_V4_1 */
330
331static inline void pnfs_destroy_all_layouts(struct nfs_client *clp)
332{
333}
334
335static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
336{
337}
338
339static inline struct pnfs_layout_segment *
340get_lseg(struct pnfs_layout_segment *lseg)
341{
342 return NULL;
343}
344
345static inline void put_lseg(struct pnfs_layout_segment *lseg)
346{
347}
348
349static inline int pnfs_return_layout(struct inode *ino)
350{
351 return 0;
352}
353
354static inline bool
355pnfs_ld_layoutret_on_setattr(struct inode *inode)
356{
357 return false;
358}
359
360static inline bool
361pnfs_roc(struct inode *ino)
362{
363 return false;
364}
365
366static inline void
367pnfs_roc_release(struct inode *ino)
368{
369}
370
371static inline void
372pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
373{
374}
375
376static inline bool
377pnfs_roc_drain(struct inode *ino, u32 *barrier)
378{
379 return false;
380}
381
382static inline void set_pnfs_layoutdriver(struct nfs_server *s,
383 const struct nfs_fh *mntfh, u32 id)
384{
385}
386
387static inline void unset_pnfs_layoutdriver(struct nfs_server *s)
388{
389}
390
391static inline bool pnfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, struct inode *inode)
392{
393 return false;
394}
395
396static inline bool pnfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, struct inode *inode, int ioflags)
397{
398 return false;
399}
400
401static inline void
402pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg)
403{
404}
405
406static inline int
407pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how)
408{
409 return PNFS_NOT_ATTEMPTED;
410}
411
412static inline struct list_head *
413pnfs_choose_commit_list(struct nfs_page *req, struct list_head *mds)
414{
415 return mds;
416}
417
418static inline void pnfs_clear_request_commit(struct nfs_page *req)
419{
420}
421
422static inline int pnfs_layoutcommit_inode(struct inode *inode, bool sync)
423{
424 return 0;
425}
426
427static inline void nfs4_deviceid_purge_client(struct nfs_client *ncl)
428{
429}
430#endif /* CONFIG_NFS_V4_1 */
431
432#endif /* FS_NFS_PNFS_H */