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TOMOYO Linux Cross Reference
Linux/fs/nfs/pnfs.h

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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/nfs_fs.h>
 34 #include <linux/nfs_page.h>
 35 #include <linux/workqueue.h>
 36 
 37 enum {
 38         NFS_LSEG_VALID = 0,     /* cleared when lseg is recalled/returned */
 39         NFS_LSEG_ROC,           /* roc bit received from server */
 40         NFS_LSEG_LAYOUTCOMMIT,  /* layoutcommit bit set for layoutcommit */
 41         NFS_LSEG_LAYOUTRETURN,  /* layoutreturn bit set for layoutreturn */
 42 };
 43 
 44 /* Individual ip address */
 45 struct nfs4_pnfs_ds_addr {
 46         struct sockaddr_storage da_addr;
 47         size_t                  da_addrlen;
 48         struct list_head        da_node;  /* nfs4_pnfs_dev_hlist dev_dslist */
 49         char                    *da_remotestr;  /* human readable addr+port */
 50 };
 51 
 52 struct nfs4_pnfs_ds {
 53         struct list_head        ds_node;  /* nfs4_pnfs_dev_hlist dev_dslist */
 54         char                    *ds_remotestr;  /* comma sep list of addrs */
 55         struct list_head        ds_addrs;
 56         struct nfs_client       *ds_clp;
 57         atomic_t                ds_count;
 58         unsigned long           ds_state;
 59 #define NFS4DS_CONNECTING       0       /* ds is establishing connection */
 60 };
 61 
 62 struct pnfs_layout_segment {
 63         struct list_head pls_list;
 64         struct list_head pls_lc_list;
 65         struct pnfs_layout_range pls_range;
 66         atomic_t pls_refcount;
 67         unsigned long pls_flags;
 68         struct pnfs_layout_hdr *pls_layout;
 69         struct work_struct pls_work;
 70 };
 71 
 72 enum pnfs_try_status {
 73         PNFS_ATTEMPTED     = 0,
 74         PNFS_NOT_ATTEMPTED = 1,
 75         PNFS_TRY_AGAIN     = 2,
 76 };
 77 
 78 #ifdef CONFIG_NFS_V4_1
 79 
 80 #define LAYOUT_NFSV4_1_MODULE_PREFIX "nfs-layouttype4"
 81 
 82 /*
 83  * Default data server connection timeout and retrans vaules.
 84  * Set by module parameters dataserver_timeo and dataserver_retrans.
 85  */
 86 #define NFS4_DEF_DS_TIMEO   600 /* in tenths of a second */
 87 #define NFS4_DEF_DS_RETRANS 5
 88 
 89 /* error codes for internal use */
 90 #define NFS4ERR_RESET_TO_MDS   12001
 91 #define NFS4ERR_RESET_TO_PNFS  12002
 92 
 93 enum {
 94         NFS_LAYOUT_RO_FAILED = 0,       /* get ro layout failed stop trying */
 95         NFS_LAYOUT_RW_FAILED,           /* get rw layout failed stop trying */
 96         NFS_LAYOUT_BULK_RECALL,         /* bulk recall affecting layout */
 97         NFS_LAYOUT_RETURN,              /* layoutreturn in progress */
 98         NFS_LAYOUT_RETURN_REQUESTED,    /* Return this layout ASAP */
 99         NFS_LAYOUT_INVALID_STID,        /* layout stateid id is invalid */
100         NFS_LAYOUT_FIRST_LAYOUTGET,     /* Serialize first layoutget */
101 };
102 
103 enum layoutdriver_policy_flags {
104         /* Should the pNFS client commit and return the layout upon truncate to
105          * a smaller size */
106         PNFS_LAYOUTRET_ON_SETATTR       = 1 << 0,
107         PNFS_LAYOUTRET_ON_ERROR         = 1 << 1,
108         PNFS_READ_WHOLE_PAGE            = 1 << 2,
109 };
110 
111 struct nfs4_deviceid_node;
112 
113 /* Per-layout driver specific registration structure */
114 struct pnfs_layoutdriver_type {
115         struct list_head pnfs_tblid;
116         const u32 id;
117         const char *name;
118         struct module *owner;
119         unsigned flags;
120         unsigned max_deviceinfo_size;
121 
122         int (*set_layoutdriver) (struct nfs_server *, const struct nfs_fh *);
123         int (*clear_layoutdriver) (struct nfs_server *);
124 
125         struct pnfs_layout_hdr * (*alloc_layout_hdr) (struct inode *inode, gfp_t gfp_flags);
126         void (*free_layout_hdr) (struct pnfs_layout_hdr *);
127 
128         struct pnfs_layout_segment * (*alloc_lseg) (struct pnfs_layout_hdr *layoutid, struct nfs4_layoutget_res *lgr, gfp_t gfp_flags);
129         void (*free_lseg) (struct pnfs_layout_segment *lseg);
130         void (*add_lseg) (struct pnfs_layout_hdr *layoutid,
131                         struct pnfs_layout_segment *lseg,
132                         struct list_head *free_me);
133 
134         void (*return_range) (struct pnfs_layout_hdr *lo,
135                               struct pnfs_layout_range *range);
136 
137         /* test for nfs page cache coalescing */
138         const struct nfs_pageio_ops *pg_read_ops;
139         const struct nfs_pageio_ops *pg_write_ops;
140 
141         struct pnfs_ds_commit_info *(*get_ds_info) (struct inode *inode);
142         void (*mark_request_commit) (struct nfs_page *req,
143                                      struct pnfs_layout_segment *lseg,
144                                      struct nfs_commit_info *cinfo,
145                                      u32 ds_commit_idx);
146         void (*clear_request_commit) (struct nfs_page *req,
147                                       struct nfs_commit_info *cinfo);
148         int (*scan_commit_lists) (struct nfs_commit_info *cinfo,
149                                   int max);
150         void (*recover_commit_reqs) (struct list_head *list,
151                                      struct nfs_commit_info *cinfo);
152         struct nfs_page * (*search_commit_reqs)(struct nfs_commit_info *cinfo,
153                                                 struct page *page);
154         int (*commit_pagelist)(struct inode *inode,
155                                struct list_head *mds_pages,
156                                int how,
157                                struct nfs_commit_info *cinfo);
158 
159         int (*sync)(struct inode *inode, bool datasync);
160 
161         /*
162          * Return PNFS_ATTEMPTED to indicate the layout code has attempted
163          * I/O, else return PNFS_NOT_ATTEMPTED to fall back to normal NFS
164          */
165         enum pnfs_try_status (*read_pagelist)(struct nfs_pgio_header *);
166         enum pnfs_try_status (*write_pagelist)(struct nfs_pgio_header *, int);
167 
168         void (*free_deviceid_node) (struct nfs4_deviceid_node *);
169         struct nfs4_deviceid_node * (*alloc_deviceid_node)
170                         (struct nfs_server *server, struct pnfs_device *pdev,
171                         gfp_t gfp_flags);
172 
173         void (*encode_layoutreturn) (struct pnfs_layout_hdr *layoutid,
174                                      struct xdr_stream *xdr,
175                                      const struct nfs4_layoutreturn_args *args);
176 
177         void (*cleanup_layoutcommit) (struct nfs4_layoutcommit_data *data);
178         int (*prepare_layoutcommit) (struct nfs4_layoutcommit_args *args);
179         void (*encode_layoutcommit) (struct pnfs_layout_hdr *lo,
180                                      struct xdr_stream *xdr,
181                                      const struct nfs4_layoutcommit_args *args);
182         int (*prepare_layoutstats) (struct nfs42_layoutstat_args *args);
183         void (*cleanup_layoutstats) (struct nfs42_layoutstat_data *data);
184 };
185 
186 struct pnfs_layout_hdr {
187         atomic_t                plh_refcount;
188         atomic_t                plh_outstanding; /* number of RPCs out */
189         struct list_head        plh_layouts;   /* other client layouts */
190         struct list_head        plh_bulk_destroy;
191         struct list_head        plh_segs;      /* layout segments list */
192         unsigned long           plh_block_lgets; /* block LAYOUTGET if >0 */
193         unsigned long           plh_retry_timestamp;
194         unsigned long           plh_flags;
195         nfs4_stateid            plh_stateid;
196         u32                     plh_barrier; /* ignore lower seqids */
197         enum pnfs_iomode        plh_return_iomode;
198         loff_t                  plh_lwb; /* last write byte for layoutcommit */
199         struct rpc_cred         *plh_lc_cred; /* layoutcommit cred */
200         struct inode            *plh_inode;
201 };
202 
203 struct pnfs_device {
204         struct nfs4_deviceid dev_id;
205         unsigned int  layout_type;
206         unsigned int  mincount;
207         unsigned int  maxcount; /* gdia_maxcount */
208         struct page **pages;
209         unsigned int  pgbase;
210         unsigned int  pglen;    /* reply buffer length */
211         unsigned char nocache : 1;/* May not be cached */
212 };
213 
214 #define NFS4_PNFS_GETDEVLIST_MAXNUM 16
215 
216 struct pnfs_devicelist {
217         unsigned int            eof;
218         unsigned int            num_devs;
219         struct nfs4_deviceid    dev_id[NFS4_PNFS_GETDEVLIST_MAXNUM];
220 };
221 
222 extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *);
223 extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *);
224 
225 /* nfs4proc.c */
226 extern int nfs4_proc_getdeviceinfo(struct nfs_server *server,
227                                    struct pnfs_device *dev,
228                                    struct rpc_cred *cred);
229 extern struct pnfs_layout_segment* nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags);
230 extern int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync);
231 
232 /* pnfs.c */
233 void pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo);
234 void pnfs_put_lseg(struct pnfs_layout_segment *lseg);
235 void pnfs_put_lseg_locked(struct pnfs_layout_segment *lseg);
236 
237 void set_pnfs_layoutdriver(struct nfs_server *, const struct nfs_fh *, u32);
238 void unset_pnfs_layoutdriver(struct nfs_server *);
239 void pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *, struct nfs_page *);
240 int pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc);
241 void pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
242                                 struct nfs_page *req, u64 wb_size);
243 void pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *);
244 int pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc);
245 size_t pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
246                             struct nfs_page *prev, struct nfs_page *req);
247 void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg);
248 struct pnfs_layout_segment *pnfs_layout_process(struct nfs4_layoutget *lgp);
249 void pnfs_free_lseg_list(struct list_head *tmp_list);
250 void pnfs_destroy_layout(struct nfs_inode *);
251 void pnfs_destroy_all_layouts(struct nfs_client *);
252 int pnfs_destroy_layouts_byfsid(struct nfs_client *clp,
253                 struct nfs_fsid *fsid,
254                 bool is_recall);
255 int pnfs_destroy_layouts_byclid(struct nfs_client *clp,
256                 bool is_recall);
257 void pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo);
258 void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo,
259                              const nfs4_stateid *new,
260                              bool update_barrier);
261 int pnfs_choose_layoutget_stateid(nfs4_stateid *dst,
262                                   struct pnfs_layout_hdr *lo,
263                                   const struct pnfs_layout_range *range,
264                                   struct nfs4_state *open_state);
265 int pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
266                                 struct list_head *tmp_list,
267                                 const struct pnfs_layout_range *recall_range);
268 int 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 bool pnfs_roc(struct inode *ino);
272 void pnfs_roc_release(struct inode *ino);
273 void pnfs_roc_set_barrier(struct inode *ino, u32 barrier);
274 void pnfs_roc_get_barrier(struct inode *ino, u32 *barrier);
275 bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task);
276 void pnfs_set_layoutcommit(struct inode *, struct pnfs_layout_segment *, loff_t);
277 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data);
278 int pnfs_layoutcommit_inode(struct inode *inode, bool sync);
279 int pnfs_generic_sync(struct inode *inode, bool datasync);
280 int pnfs_nfs_generic_sync(struct inode *inode, bool datasync);
281 int _pnfs_return_layout(struct inode *);
282 int pnfs_commit_and_return_layout(struct inode *);
283 void pnfs_ld_write_done(struct nfs_pgio_header *);
284 void pnfs_ld_read_done(struct nfs_pgio_header *);
285 int pnfs_read_resend_pnfs(struct nfs_pgio_header *);
286 struct pnfs_layout_segment *pnfs_update_layout(struct inode *ino,
287                                                struct nfs_open_context *ctx,
288                                                loff_t pos,
289                                                u64 count,
290                                                enum pnfs_iomode iomode,
291                                                gfp_t gfp_flags);
292 void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr *lo);
293 
294 void pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo,
295                    struct pnfs_layout_segment *lseg,
296                    bool (*is_after)(const struct pnfs_layout_range *lseg_range,
297                            const struct pnfs_layout_range *old),
298                    bool (*do_merge)(struct pnfs_layout_segment *lseg,
299                            struct pnfs_layout_segment *old),
300                    struct list_head *free_me);
301 
302 void nfs4_deviceid_mark_client_invalid(struct nfs_client *clp);
303 int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *);
304 int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *);
305 struct nfs4_threshold *pnfs_mdsthreshold_alloc(void);
306 void pnfs_error_mark_layout_for_return(struct inode *inode,
307                                        struct pnfs_layout_segment *lseg);
308 /* nfs4_deviceid_flags */
309 enum {
310         NFS_DEVICEID_INVALID = 0,       /* set when MDS clientid recalled */
311         NFS_DEVICEID_UNAVAILABLE,       /* device temporarily unavailable */
312         NFS_DEVICEID_NOCACHE,           /* device may not be cached */
313 };
314 
315 /* pnfs_dev.c */
316 struct nfs4_deviceid_node {
317         struct hlist_node               node;
318         struct hlist_node               tmpnode;
319         const struct pnfs_layoutdriver_type *ld;
320         const struct nfs_client         *nfs_client;
321         unsigned long                   flags;
322         unsigned long                   timestamp_unavailable;
323         struct nfs4_deviceid            deviceid;
324         struct rcu_head                 rcu;
325         atomic_t                        ref;
326 };
327 
328 struct nfs4_deviceid_node *
329 nfs4_find_get_deviceid(struct nfs_server *server,
330                 const struct nfs4_deviceid *id, struct rpc_cred *cred,
331                 gfp_t gfp_mask);
332 void nfs4_delete_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
333 void nfs4_init_deviceid_node(struct nfs4_deviceid_node *, struct nfs_server *,
334                              const struct nfs4_deviceid *);
335 bool nfs4_put_deviceid_node(struct nfs4_deviceid_node *);
336 void nfs4_mark_deviceid_unavailable(struct nfs4_deviceid_node *node);
337 bool nfs4_test_deviceid_unavailable(struct nfs4_deviceid_node *node);
338 void nfs4_deviceid_purge_client(const struct nfs_client *);
339 
340 /* pnfs_nfs.c */
341 void pnfs_generic_clear_request_commit(struct nfs_page *req,
342                                        struct nfs_commit_info *cinfo);
343 void pnfs_generic_commit_release(void *calldata);
344 void pnfs_generic_prepare_to_resend_writes(struct nfs_commit_data *data);
345 void pnfs_generic_rw_release(void *data);
346 void pnfs_generic_recover_commit_reqs(struct list_head *dst,
347                                       struct nfs_commit_info *cinfo);
348 int pnfs_generic_commit_pagelist(struct inode *inode,
349                                  struct list_head *mds_pages,
350                                  int how,
351                                  struct nfs_commit_info *cinfo,
352                                  int (*initiate_commit)(struct nfs_commit_data *data,
353                                                         int how));
354 int pnfs_generic_scan_commit_lists(struct nfs_commit_info *cinfo, int max);
355 void pnfs_generic_write_commit_done(struct rpc_task *task, void *data);
356 void nfs4_pnfs_ds_put(struct nfs4_pnfs_ds *ds);
357 struct nfs4_pnfs_ds *nfs4_pnfs_ds_add(struct list_head *dsaddrs,
358                                       gfp_t gfp_flags);
359 void nfs4_pnfs_v3_ds_connect_unload(void);
360 void nfs4_pnfs_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds,
361                           struct nfs4_deviceid_node *devid, unsigned int timeo,
362                           unsigned int retrans, u32 version, u32 minor_version,
363                           rpc_authflavor_t au_flavor);
364 struct nfs4_pnfs_ds_addr *nfs4_decode_mp_ds_addr(struct net *net,
365                                                  struct xdr_stream *xdr,
366                                                  gfp_t gfp_flags);
367 void pnfs_layout_mark_request_commit(struct nfs_page *req,
368                                      struct pnfs_layout_segment *lseg,
369                                      struct nfs_commit_info *cinfo,
370                                      u32 ds_commit_idx);
371 
372 static inline bool nfs_have_layout(struct inode *inode)
373 {
374         return NFS_I(inode)->layout != NULL;
375 }
376 
377 static inline struct nfs4_deviceid_node *
378 nfs4_get_deviceid(struct nfs4_deviceid_node *d)
379 {
380         atomic_inc(&d->ref);
381         return d;
382 }
383 
384 static inline struct pnfs_layout_segment *
385 pnfs_get_lseg(struct pnfs_layout_segment *lseg)
386 {
387         if (lseg) {
388                 atomic_inc(&lseg->pls_refcount);
389                 smp_mb__after_atomic();
390         }
391         return lseg;
392 }
393 
394 static inline bool
395 pnfs_is_valid_lseg(struct pnfs_layout_segment *lseg)
396 {
397         return test_bit(NFS_LSEG_VALID, &lseg->pls_flags) != 0;
398 }
399 
400 /* Return true if a layout driver is being used for this mountpoint */
401 static inline int pnfs_enabled_sb(struct nfs_server *nfss)
402 {
403         return nfss->pnfs_curr_ld != NULL;
404 }
405 
406 static inline int
407 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
408                  struct nfs_commit_info *cinfo)
409 {
410         if (cinfo->ds == NULL || cinfo->ds->ncommitting == 0)
411                 return PNFS_NOT_ATTEMPTED;
412         return NFS_SERVER(inode)->pnfs_curr_ld->commit_pagelist(inode, mds_pages, how, cinfo);
413 }
414 
415 static inline struct pnfs_ds_commit_info *
416 pnfs_get_ds_info(struct inode *inode)
417 {
418         struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
419 
420         if (ld == NULL || ld->get_ds_info == NULL)
421                 return NULL;
422         return ld->get_ds_info(inode);
423 }
424 
425 static inline void
426 pnfs_generic_mark_devid_invalid(struct nfs4_deviceid_node *node)
427 {
428         set_bit(NFS_DEVICEID_INVALID, &node->flags);
429 }
430 
431 static inline bool
432 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
433                          struct nfs_commit_info *cinfo, u32 ds_commit_idx)
434 {
435         struct inode *inode = d_inode(req->wb_context->dentry);
436         struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
437 
438         if (lseg == NULL || ld->mark_request_commit == NULL)
439                 return false;
440         ld->mark_request_commit(req, lseg, cinfo, ds_commit_idx);
441         return true;
442 }
443 
444 static inline bool
445 pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
446 {
447         struct inode *inode = d_inode(req->wb_context->dentry);
448         struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
449 
450         if (ld == NULL || ld->clear_request_commit == NULL)
451                 return false;
452         ld->clear_request_commit(req, cinfo);
453         return true;
454 }
455 
456 static inline int
457 pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
458                        int max)
459 {
460         if (cinfo->ds == NULL || cinfo->ds->nwritten == 0)
461                 return 0;
462         else
463                 return NFS_SERVER(inode)->pnfs_curr_ld->scan_commit_lists(cinfo, max);
464 }
465 
466 static inline struct nfs_page *
467 pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo,
468                         struct page *page)
469 {
470         struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
471 
472         if (ld == NULL || ld->search_commit_reqs == NULL)
473                 return NULL;
474         return ld->search_commit_reqs(cinfo, page);
475 }
476 
477 /* Should the pNFS client commit and return the layout upon a setattr */
478 static inline bool
479 pnfs_ld_layoutret_on_setattr(struct inode *inode)
480 {
481         if (!pnfs_enabled_sb(NFS_SERVER(inode)))
482                 return false;
483         return NFS_SERVER(inode)->pnfs_curr_ld->flags &
484                 PNFS_LAYOUTRET_ON_SETATTR;
485 }
486 
487 static inline bool
488 pnfs_ld_read_whole_page(struct inode *inode)
489 {
490         if (!pnfs_enabled_sb(NFS_SERVER(inode)))
491                 return false;
492         return NFS_SERVER(inode)->pnfs_curr_ld->flags & PNFS_READ_WHOLE_PAGE;
493 }
494 
495 static inline int
496 pnfs_sync_inode(struct inode *inode, bool datasync)
497 {
498         if (!pnfs_enabled_sb(NFS_SERVER(inode)))
499                 return 0;
500         return NFS_SERVER(inode)->pnfs_curr_ld->sync(inode, datasync);
501 }
502 
503 static inline bool
504 pnfs_layoutcommit_outstanding(struct inode *inode)
505 {
506         struct nfs_inode *nfsi = NFS_I(inode);
507 
508         return test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags) != 0 ||
509                 test_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags) != 0;
510 }
511 
512 static inline int pnfs_return_layout(struct inode *ino)
513 {
514         struct nfs_inode *nfsi = NFS_I(ino);
515         struct nfs_server *nfss = NFS_SERVER(ino);
516 
517         if (pnfs_enabled_sb(nfss) && nfsi->layout)
518                 return _pnfs_return_layout(ino);
519 
520         return 0;
521 }
522 
523 static inline bool
524 pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
525                    struct nfs_server *nfss)
526 {
527         return (dst && src && src->bm != 0 && nfss->pnfs_curr_ld &&
528                                         nfss->pnfs_curr_ld->id == src->l_type);
529 }
530 
531 static inline u64
532 pnfs_calc_offset_end(u64 offset, u64 len)
533 {
534         if (len == NFS4_MAX_UINT64 || len >= NFS4_MAX_UINT64 - offset)
535                 return NFS4_MAX_UINT64;
536         return offset + len - 1;
537 }
538 
539 static inline u64
540 pnfs_calc_offset_length(u64 offset, u64 end)
541 {
542         if (end == NFS4_MAX_UINT64 || end <= offset)
543                 return NFS4_MAX_UINT64;
544         return 1 + end - offset;
545 }
546 
547 /**
548  * pnfs_mark_layout_returned_if_empty - marks the layout as returned
549  * @lo: layout header
550  *
551  * Note: Caller must hold inode->i_lock
552  */
553 static inline void
554 pnfs_mark_layout_returned_if_empty(struct pnfs_layout_hdr *lo)
555 {
556         if (list_empty(&lo->plh_segs))
557                 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
558 }
559 
560 static inline void
561 pnfs_copy_range(struct pnfs_layout_range *dst,
562                 const struct pnfs_layout_range *src)
563 {
564         memcpy(dst, src, sizeof(*dst));
565 }
566 
567 extern unsigned int layoutstats_timer;
568 
569 #ifdef NFS_DEBUG
570 void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id);
571 #else
572 static inline void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id)
573 {
574 }
575 
576 #endif /* NFS_DEBUG */
577 #else  /* CONFIG_NFS_V4_1 */
578 
579 static inline bool nfs_have_layout(struct inode *inode)
580 {
581         return false;
582 }
583 
584 static inline void pnfs_destroy_all_layouts(struct nfs_client *clp)
585 {
586 }
587 
588 static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
589 {
590 }
591 
592 static inline struct pnfs_layout_segment *
593 pnfs_get_lseg(struct pnfs_layout_segment *lseg)
594 {
595         return NULL;
596 }
597 
598 static inline void pnfs_put_lseg(struct pnfs_layout_segment *lseg)
599 {
600 }
601 
602 static inline int pnfs_return_layout(struct inode *ino)
603 {
604         return 0;
605 }
606 
607 static inline int pnfs_commit_and_return_layout(struct inode *inode)
608 {
609         return 0;
610 }
611 
612 static inline bool
613 pnfs_ld_layoutret_on_setattr(struct inode *inode)
614 {
615         return false;
616 }
617 
618 static inline bool
619 pnfs_ld_read_whole_page(struct inode *inode)
620 {
621         return false;
622 }
623 
624 static inline int
625 pnfs_sync_inode(struct inode *inode, bool datasync)
626 {
627         return 0;
628 }
629 
630 static inline bool
631 pnfs_roc(struct inode *ino)
632 {
633         return false;
634 }
635 
636 static inline void
637 pnfs_roc_release(struct inode *ino)
638 {
639 }
640 
641 static inline void
642 pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
643 {
644 }
645 
646 static inline void
647 pnfs_roc_get_barrier(struct inode *ino, u32 *barrier)
648 {
649 }
650 
651 static inline bool
652 pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task)
653 {
654         return false;
655 }
656 
657 static inline void set_pnfs_layoutdriver(struct nfs_server *s,
658                                          const struct nfs_fh *mntfh, u32 id)
659 {
660 }
661 
662 static inline void unset_pnfs_layoutdriver(struct nfs_server *s)
663 {
664 }
665 
666 static inline int
667 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
668                  struct nfs_commit_info *cinfo)
669 {
670         return PNFS_NOT_ATTEMPTED;
671 }
672 
673 static inline struct pnfs_ds_commit_info *
674 pnfs_get_ds_info(struct inode *inode)
675 {
676         return NULL;
677 }
678 
679 static inline bool
680 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
681                          struct nfs_commit_info *cinfo, u32 ds_commit_idx)
682 {
683         return false;
684 }
685 
686 static inline bool
687 pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
688 {
689         return false;
690 }
691 
692 static inline int
693 pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
694                        int max)
695 {
696         return 0;
697 }
698 
699 static inline struct nfs_page *
700 pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo,
701                         struct page *page)
702 {
703         return NULL;
704 }
705 
706 static inline int pnfs_layoutcommit_inode(struct inode *inode, bool sync)
707 {
708         return 0;
709 }
710 
711 static inline bool
712 pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
713                    struct nfs_server *nfss)
714 {
715         return false;
716 }
717 
718 static inline bool
719 pnfs_layoutcommit_outstanding(struct inode *inode)
720 {
721         return false;
722 }
723 
724 
725 static inline struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
726 {
727         return NULL;
728 }
729 
730 static inline void nfs4_pnfs_v3_ds_connect_unload(void)
731 {
732 }
733 
734 #endif /* CONFIG_NFS_V4_1 */
735 
736 #if IS_ENABLED(CONFIG_NFS_V4_2)
737 int pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags);
738 #else
739 static inline int
740 pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags)
741 {
742         return 0;
743 }
744 #endif
745 
746 #endif /* FS_NFS_PNFS_H */
747 

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