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

Version: ~ [ linux-5.2-rc1 ] ~ [ linux-5.1.2 ] ~ [ linux-5.0.16 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.43 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.119 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.176 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.179 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.139 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.67 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.39.4 ] ~ [ linux-2.6.38.8 ] ~ [ linux-2.6.37.6 ] ~ [ linux-2.6.36.4 ] ~ [ linux-2.6.35.14 ] ~ [ linux-2.6.34.15 ] ~ [ linux-2.6.33.20 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
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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 
 38 enum {
 39         NFS_LSEG_VALID = 0,     /* cleared when lseg is recalled/returned */
 40         NFS_LSEG_ROC,           /* roc bit received from server */
 41         NFS_LSEG_LAYOUTCOMMIT,  /* layoutcommit bit set for layoutcommit */
 42         NFS_LSEG_LAYOUTRETURN,  /* layoutreturn bit set for layoutreturn */
 43         NFS_LSEG_UNAVAILABLE,   /* unavailable bit set for temporary problem */
 44 };
 45 
 46 /* Individual ip address */
 47 struct nfs4_pnfs_ds_addr {
 48         struct sockaddr_storage da_addr;
 49         size_t                  da_addrlen;
 50         struct list_head        da_node;  /* nfs4_pnfs_dev_hlist dev_dslist */
 51         char                    *da_remotestr;  /* human readable addr+port */
 52 };
 53 
 54 struct nfs4_pnfs_ds {
 55         struct list_head        ds_node;  /* nfs4_pnfs_dev_hlist dev_dslist */
 56         char                    *ds_remotestr;  /* comma sep list of addrs */
 57         struct list_head        ds_addrs;
 58         struct nfs_client       *ds_clp;
 59         refcount_t              ds_count;
 60         unsigned long           ds_state;
 61 #define NFS4DS_CONNECTING       0       /* ds is establishing connection */
 62 };
 63 
 64 struct pnfs_layout_segment {
 65         struct list_head pls_list;
 66         struct list_head pls_lc_list;
 67         struct pnfs_layout_range pls_range;
 68         refcount_t pls_refcount;
 69         u32 pls_seq;
 70         unsigned long pls_flags;
 71         struct pnfs_layout_hdr *pls_layout;
 72 };
 73 
 74 enum pnfs_try_status {
 75         PNFS_ATTEMPTED     = 0,
 76         PNFS_NOT_ATTEMPTED = 1,
 77         PNFS_TRY_AGAIN     = 2,
 78 };
 79 
 80 #ifdef CONFIG_NFS_V4_1
 81 
 82 #define LAYOUT_NFSV4_1_MODULE_PREFIX "nfs-layouttype4"
 83 
 84 /*
 85  * Default data server connection timeout and retrans vaules.
 86  * Set by module parameters dataserver_timeo and dataserver_retrans.
 87  */
 88 #define NFS4_DEF_DS_TIMEO   600 /* in tenths of a second */
 89 #define NFS4_DEF_DS_RETRANS 5
 90 #define PNFS_DEVICE_RETRY_TIMEOUT (120*HZ)
 91 
 92 /* error codes for internal use */
 93 #define NFS4ERR_RESET_TO_MDS   12001
 94 #define NFS4ERR_RESET_TO_PNFS  12002
 95 
 96 enum {
 97         NFS_LAYOUT_RO_FAILED = 0,       /* get ro layout failed stop trying */
 98         NFS_LAYOUT_RW_FAILED,           /* get rw layout failed stop trying */
 99         NFS_LAYOUT_BULK_RECALL,         /* bulk recall affecting layout */
100         NFS_LAYOUT_RETURN,              /* layoutreturn in progress */
101         NFS_LAYOUT_RETURN_LOCK,         /* Serialise layoutreturn */
102         NFS_LAYOUT_RETURN_REQUESTED,    /* Return this layout ASAP */
103         NFS_LAYOUT_INVALID_STID,        /* layout stateid id is invalid */
104         NFS_LAYOUT_FIRST_LAYOUTGET,     /* Serialize first layoutget */
105 };
106 
107 enum layoutdriver_policy_flags {
108         /* Should the pNFS client commit and return the layout upon truncate to
109          * a smaller size */
110         PNFS_LAYOUTRET_ON_SETATTR       = 1 << 0,
111         PNFS_LAYOUTRET_ON_ERROR         = 1 << 1,
112         PNFS_READ_WHOLE_PAGE            = 1 << 2,
113 };
114 
115 struct nfs4_deviceid_node;
116 
117 /* Per-layout driver specific registration structure */
118 struct pnfs_layoutdriver_type {
119         struct list_head pnfs_tblid;
120         const u32 id;
121         const char *name;
122         struct module *owner;
123         unsigned flags;
124         unsigned max_deviceinfo_size;
125 
126         int (*set_layoutdriver) (struct nfs_server *, const struct nfs_fh *);
127         int (*clear_layoutdriver) (struct nfs_server *);
128 
129         struct pnfs_layout_hdr * (*alloc_layout_hdr) (struct inode *inode, gfp_t gfp_flags);
130         void (*free_layout_hdr) (struct pnfs_layout_hdr *);
131 
132         struct pnfs_layout_segment * (*alloc_lseg) (struct pnfs_layout_hdr *layoutid, struct nfs4_layoutget_res *lgr, gfp_t gfp_flags);
133         void (*free_lseg) (struct pnfs_layout_segment *lseg);
134         void (*add_lseg) (struct pnfs_layout_hdr *layoutid,
135                         struct pnfs_layout_segment *lseg,
136                         struct list_head *free_me);
137 
138         void (*return_range) (struct pnfs_layout_hdr *lo,
139                               struct pnfs_layout_range *range);
140 
141         /* test for nfs page cache coalescing */
142         const struct nfs_pageio_ops *pg_read_ops;
143         const struct nfs_pageio_ops *pg_write_ops;
144 
145         struct pnfs_ds_commit_info *(*get_ds_info) (struct inode *inode);
146         void (*mark_request_commit) (struct nfs_page *req,
147                                      struct pnfs_layout_segment *lseg,
148                                      struct nfs_commit_info *cinfo,
149                                      u32 ds_commit_idx);
150         void (*clear_request_commit) (struct nfs_page *req,
151                                       struct nfs_commit_info *cinfo);
152         int (*scan_commit_lists) (struct nfs_commit_info *cinfo,
153                                   int max);
154         void (*recover_commit_reqs) (struct list_head *list,
155                                      struct nfs_commit_info *cinfo);
156         struct nfs_page * (*search_commit_reqs)(struct nfs_commit_info *cinfo,
157                                                 struct page *page);
158         int (*commit_pagelist)(struct inode *inode,
159                                struct list_head *mds_pages,
160                                int how,
161                                struct nfs_commit_info *cinfo);
162 
163         int (*sync)(struct inode *inode, bool datasync);
164 
165         /*
166          * Return PNFS_ATTEMPTED to indicate the layout code has attempted
167          * I/O, else return PNFS_NOT_ATTEMPTED to fall back to normal NFS
168          */
169         enum pnfs_try_status (*read_pagelist)(struct nfs_pgio_header *);
170         enum pnfs_try_status (*write_pagelist)(struct nfs_pgio_header *, int);
171 
172         void (*free_deviceid_node) (struct nfs4_deviceid_node *);
173         struct nfs4_deviceid_node * (*alloc_deviceid_node)
174                         (struct nfs_server *server, struct pnfs_device *pdev,
175                         gfp_t gfp_flags);
176 
177         int (*prepare_layoutreturn) (struct nfs4_layoutreturn_args *);
178 
179         void (*cleanup_layoutcommit) (struct nfs4_layoutcommit_data *data);
180         int (*prepare_layoutcommit) (struct nfs4_layoutcommit_args *args);
181         int (*prepare_layoutstats) (struct nfs42_layoutstat_args *args);
182 };
183 
184 struct pnfs_layout_hdr {
185         refcount_t              plh_refcount;
186         atomic_t                plh_outstanding; /* number of RPCs out */
187         struct list_head        plh_layouts;   /* other client layouts */
188         struct list_head        plh_bulk_destroy;
189         struct list_head        plh_segs;      /* layout segments list */
190         struct list_head        plh_return_segs; /* invalid layout segments */
191         unsigned long           plh_block_lgets; /* block LAYOUTGET if >0 */
192         unsigned long           plh_retry_timestamp;
193         unsigned long           plh_flags;
194         nfs4_stateid            plh_stateid;
195         u32                     plh_barrier; /* ignore lower seqids */
196         u32                     plh_return_seq;
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, long *timeout, 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 
236 void set_pnfs_layoutdriver(struct nfs_server *, const struct nfs_fh *, struct nfs_fsinfo *);
237 void unset_pnfs_layoutdriver(struct nfs_server *);
238 void pnfs_generic_pg_check_layout(struct nfs_pageio_descriptor *pgio);
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 bool nfs4_refresh_layout_stateid(nfs4_stateid *dst, struct inode *inode);
258 void pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo);
259 void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo,
260                              const nfs4_stateid *new,
261                              bool update_barrier);
262 int pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
263                                 struct list_head *tmp_list,
264                                 const struct pnfs_layout_range *recall_range,
265                                 u32 seq);
266 int pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo,
267                                 struct list_head *tmp_list,
268                                 const struct pnfs_layout_range *recall_range,
269                                 u32 seq);
270 int pnfs_mark_layout_stateid_invalid(struct pnfs_layout_hdr *lo,
271                 struct list_head *lseg_list);
272 bool pnfs_roc(struct inode *ino,
273                 struct nfs4_layoutreturn_args *args,
274                 struct nfs4_layoutreturn_res *res,
275                 const struct rpc_cred *cred);
276 void pnfs_roc_release(struct nfs4_layoutreturn_args *args,
277                 struct nfs4_layoutreturn_res *res,
278                 int ret);
279 bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task);
280 void pnfs_set_layoutcommit(struct inode *, struct pnfs_layout_segment *, loff_t);
281 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data);
282 int pnfs_layoutcommit_inode(struct inode *inode, bool sync);
283 int pnfs_generic_sync(struct inode *inode, bool datasync);
284 int pnfs_nfs_generic_sync(struct inode *inode, bool datasync);
285 int _pnfs_return_layout(struct inode *);
286 int pnfs_commit_and_return_layout(struct inode *);
287 void pnfs_ld_write_done(struct nfs_pgio_header *);
288 void pnfs_ld_read_done(struct nfs_pgio_header *);
289 void pnfs_read_resend_pnfs(struct nfs_pgio_header *);
290 struct pnfs_layout_segment *pnfs_update_layout(struct inode *ino,
291                                                struct nfs_open_context *ctx,
292                                                loff_t pos,
293                                                u64 count,
294                                                enum pnfs_iomode iomode,
295                                                bool strict_iomode,
296                                                gfp_t gfp_flags);
297 void pnfs_layoutreturn_free_lsegs(struct pnfs_layout_hdr *lo,
298                 const nfs4_stateid *arg_stateid,
299                 const struct pnfs_layout_range *range,
300                 const nfs4_stateid *stateid);
301 
302 void pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo,
303                    struct pnfs_layout_segment *lseg,
304                    bool (*is_after)(const struct pnfs_layout_range *lseg_range,
305                            const struct pnfs_layout_range *old),
306                    bool (*do_merge)(struct pnfs_layout_segment *lseg,
307                            struct pnfs_layout_segment *old),
308                    struct list_head *free_me);
309 
310 void nfs4_deviceid_mark_client_invalid(struct nfs_client *clp);
311 int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *);
312 int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *);
313 struct nfs4_threshold *pnfs_mdsthreshold_alloc(void);
314 void pnfs_error_mark_layout_for_return(struct inode *inode,
315                                        struct pnfs_layout_segment *lseg);
316 /* nfs4_deviceid_flags */
317 enum {
318         NFS_DEVICEID_INVALID = 0,       /* set when MDS clientid recalled */
319         NFS_DEVICEID_UNAVAILABLE,       /* device temporarily unavailable */
320         NFS_DEVICEID_NOCACHE,           /* device may not be cached */
321 };
322 
323 /* pnfs_dev.c */
324 struct nfs4_deviceid_node {
325         struct hlist_node               node;
326         struct hlist_node               tmpnode;
327         const struct pnfs_layoutdriver_type *ld;
328         const struct nfs_client         *nfs_client;
329         unsigned long                   flags;
330         unsigned long                   timestamp_unavailable;
331         struct nfs4_deviceid            deviceid;
332         struct rcu_head                 rcu;
333         atomic_t                        ref;
334 };
335 
336 struct nfs4_deviceid_node *
337 nfs4_find_get_deviceid(struct nfs_server *server,
338                 const struct nfs4_deviceid *id, struct rpc_cred *cred,
339                 gfp_t gfp_mask);
340 void nfs4_delete_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
341 void nfs4_init_deviceid_node(struct nfs4_deviceid_node *, struct nfs_server *,
342                              const struct nfs4_deviceid *);
343 bool nfs4_put_deviceid_node(struct nfs4_deviceid_node *);
344 void nfs4_mark_deviceid_unavailable(struct nfs4_deviceid_node *node);
345 bool nfs4_test_deviceid_unavailable(struct nfs4_deviceid_node *node);
346 void nfs4_deviceid_purge_client(const struct nfs_client *);
347 
348 /* pnfs_nfs.c */
349 void pnfs_generic_clear_request_commit(struct nfs_page *req,
350                                        struct nfs_commit_info *cinfo);
351 void pnfs_generic_commit_release(void *calldata);
352 void pnfs_generic_prepare_to_resend_writes(struct nfs_commit_data *data);
353 void pnfs_generic_rw_release(void *data);
354 void pnfs_generic_recover_commit_reqs(struct list_head *dst,
355                                       struct nfs_commit_info *cinfo);
356 int pnfs_generic_commit_pagelist(struct inode *inode,
357                                  struct list_head *mds_pages,
358                                  int how,
359                                  struct nfs_commit_info *cinfo,
360                                  int (*initiate_commit)(struct nfs_commit_data *data,
361                                                         int how));
362 int pnfs_generic_scan_commit_lists(struct nfs_commit_info *cinfo, int max);
363 void pnfs_generic_write_commit_done(struct rpc_task *task, void *data);
364 void nfs4_pnfs_ds_put(struct nfs4_pnfs_ds *ds);
365 struct nfs4_pnfs_ds *nfs4_pnfs_ds_add(struct list_head *dsaddrs,
366                                       gfp_t gfp_flags);
367 void nfs4_pnfs_v3_ds_connect_unload(void);
368 int nfs4_pnfs_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds,
369                           struct nfs4_deviceid_node *devid, unsigned int timeo,
370                           unsigned int retrans, u32 version, u32 minor_version);
371 struct nfs4_pnfs_ds_addr *nfs4_decode_mp_ds_addr(struct net *net,
372                                                  struct xdr_stream *xdr,
373                                                  gfp_t gfp_flags);
374 void pnfs_layout_mark_request_commit(struct nfs_page *req,
375                                      struct pnfs_layout_segment *lseg,
376                                      struct nfs_commit_info *cinfo,
377                                      u32 ds_commit_idx);
378 
379 static inline bool nfs_have_layout(struct inode *inode)
380 {
381         return NFS_I(inode)->layout != NULL;
382 }
383 
384 static inline bool pnfs_layout_is_valid(const struct pnfs_layout_hdr *lo)
385 {
386         return test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) == 0;
387 }
388 
389 static inline struct nfs4_deviceid_node *
390 nfs4_get_deviceid(struct nfs4_deviceid_node *d)
391 {
392         atomic_inc(&d->ref);
393         return d;
394 }
395 
396 static inline struct pnfs_layout_segment *
397 pnfs_get_lseg(struct pnfs_layout_segment *lseg)
398 {
399         if (lseg) {
400                 refcount_inc(&lseg->pls_refcount);
401                 smp_mb__after_atomic();
402         }
403         return lseg;
404 }
405 
406 static inline bool
407 pnfs_is_valid_lseg(struct pnfs_layout_segment *lseg)
408 {
409         return test_bit(NFS_LSEG_VALID, &lseg->pls_flags) != 0;
410 }
411 
412 /* Return true if a layout driver is being used for this mountpoint */
413 static inline int pnfs_enabled_sb(struct nfs_server *nfss)
414 {
415         return nfss->pnfs_curr_ld != NULL;
416 }
417 
418 static inline int
419 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
420                  struct nfs_commit_info *cinfo)
421 {
422         if (cinfo->ds == NULL || cinfo->ds->ncommitting == 0)
423                 return PNFS_NOT_ATTEMPTED;
424         return NFS_SERVER(inode)->pnfs_curr_ld->commit_pagelist(inode, mds_pages, how, cinfo);
425 }
426 
427 static inline struct pnfs_ds_commit_info *
428 pnfs_get_ds_info(struct inode *inode)
429 {
430         struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
431 
432         if (ld == NULL || ld->get_ds_info == NULL)
433                 return NULL;
434         return ld->get_ds_info(inode);
435 }
436 
437 static inline void
438 pnfs_generic_mark_devid_invalid(struct nfs4_deviceid_node *node)
439 {
440         set_bit(NFS_DEVICEID_INVALID, &node->flags);
441 }
442 
443 static inline bool
444 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
445                          struct nfs_commit_info *cinfo, u32 ds_commit_idx)
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 (lseg == NULL || ld->mark_request_commit == NULL)
451                 return false;
452         ld->mark_request_commit(req, lseg, cinfo, ds_commit_idx);
453         return true;
454 }
455 
456 static inline bool
457 pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
458 {
459         struct inode *inode = d_inode(req->wb_context->dentry);
460         struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
461 
462         if (ld == NULL || ld->clear_request_commit == NULL)
463                 return false;
464         ld->clear_request_commit(req, cinfo);
465         return true;
466 }
467 
468 static inline int
469 pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
470                        int max)
471 {
472         if (cinfo->ds == NULL || cinfo->ds->nwritten == 0)
473                 return 0;
474         else
475                 return NFS_SERVER(inode)->pnfs_curr_ld->scan_commit_lists(cinfo, max);
476 }
477 
478 static inline struct nfs_page *
479 pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo,
480                         struct page *page)
481 {
482         struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
483 
484         if (ld == NULL || ld->search_commit_reqs == NULL)
485                 return NULL;
486         return ld->search_commit_reqs(cinfo, page);
487 }
488 
489 /* Should the pNFS client commit and return the layout upon a setattr */
490 static inline bool
491 pnfs_ld_layoutret_on_setattr(struct inode *inode)
492 {
493         if (!pnfs_enabled_sb(NFS_SERVER(inode)))
494                 return false;
495         return NFS_SERVER(inode)->pnfs_curr_ld->flags &
496                 PNFS_LAYOUTRET_ON_SETATTR;
497 }
498 
499 static inline bool
500 pnfs_ld_read_whole_page(struct inode *inode)
501 {
502         if (!pnfs_enabled_sb(NFS_SERVER(inode)))
503                 return false;
504         return NFS_SERVER(inode)->pnfs_curr_ld->flags & PNFS_READ_WHOLE_PAGE;
505 }
506 
507 static inline int
508 pnfs_sync_inode(struct inode *inode, bool datasync)
509 {
510         if (!pnfs_enabled_sb(NFS_SERVER(inode)))
511                 return 0;
512         return NFS_SERVER(inode)->pnfs_curr_ld->sync(inode, datasync);
513 }
514 
515 static inline bool
516 pnfs_layoutcommit_outstanding(struct inode *inode)
517 {
518         struct nfs_inode *nfsi = NFS_I(inode);
519 
520         return test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags) != 0 ||
521                 test_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags) != 0;
522 }
523 
524 static inline int pnfs_return_layout(struct inode *ino)
525 {
526         struct nfs_inode *nfsi = NFS_I(ino);
527         struct nfs_server *nfss = NFS_SERVER(ino);
528 
529         if (pnfs_enabled_sb(nfss) && nfsi->layout) {
530                 set_bit(NFS_LAYOUT_RETURN_REQUESTED, &nfsi->layout->plh_flags);
531                 return _pnfs_return_layout(ino);
532         }
533 
534         return 0;
535 }
536 
537 static inline bool
538 pnfs_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 
545 static inline u64
546 pnfs_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 
553 static inline u64
554 pnfs_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 
561 static inline void
562 pnfs_copy_range(struct pnfs_layout_range *dst,
563                 const struct pnfs_layout_range *src)
564 {
565         memcpy(dst, src, sizeof(*dst));
566 }
567 
568 static inline u64
569 pnfs_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  */
583 static inline bool
584 pnfs_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 
590 static inline bool
591 pnfs_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 
600 static inline bool
601 pnfs_lseg_request_intersecting(struct pnfs_layout_segment *lseg, struct nfs_page *req)
602 {
603         u64 seg_last = pnfs_end_offset(lseg->pls_range.offset, lseg->pls_range.length);
604         u64 req_last = req_offset(req) + req->wb_bytes;
605 
606         return pnfs_is_range_intersecting(lseg->pls_range.offset, seg_last,
607                                 req_offset(req), req_last);
608 }
609 
610 extern unsigned int layoutstats_timer;
611 
612 #ifdef NFS_DEBUG
613 void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id);
614 #else
615 static inline void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id)
616 {
617 }
618 
619 #endif /* NFS_DEBUG */
620 #else  /* CONFIG_NFS_V4_1 */
621 
622 static inline bool nfs_have_layout(struct inode *inode)
623 {
624         return false;
625 }
626 
627 static inline void pnfs_destroy_all_layouts(struct nfs_client *clp)
628 {
629 }
630 
631 static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
632 {
633 }
634 
635 static inline struct pnfs_layout_segment *
636 pnfs_get_lseg(struct pnfs_layout_segment *lseg)
637 {
638         return NULL;
639 }
640 
641 static inline void pnfs_put_lseg(struct pnfs_layout_segment *lseg)
642 {
643 }
644 
645 static inline int pnfs_return_layout(struct inode *ino)
646 {
647         return 0;
648 }
649 
650 static inline int pnfs_commit_and_return_layout(struct inode *inode)
651 {
652         return 0;
653 }
654 
655 static inline bool
656 pnfs_ld_layoutret_on_setattr(struct inode *inode)
657 {
658         return false;
659 }
660 
661 static inline bool
662 pnfs_ld_read_whole_page(struct inode *inode)
663 {
664         return false;
665 }
666 
667 static inline int
668 pnfs_sync_inode(struct inode *inode, bool datasync)
669 {
670         return 0;
671 }
672 
673 static inline bool
674 pnfs_layoutcommit_outstanding(struct inode *inode)
675 {
676         return false;
677 }
678 
679 
680 static inline bool
681 pnfs_roc(struct inode *ino,
682                 struct nfs4_layoutreturn_args *args,
683                 struct nfs4_layoutreturn_res *res,
684                 const struct rpc_cred *cred)
685 {
686         return false;
687 }
688 
689 static inline void
690 pnfs_roc_release(struct nfs4_layoutreturn_args *args,
691                 struct nfs4_layoutreturn_res *res,
692                 int ret)
693 {
694 }
695 
696 static inline bool
697 pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task)
698 {
699         return false;
700 }
701 
702 static inline void set_pnfs_layoutdriver(struct nfs_server *s,
703                                          const struct nfs_fh *mntfh,
704                                          struct nfs_fsinfo *fsinfo)
705 {
706 }
707 
708 static inline void unset_pnfs_layoutdriver(struct nfs_server *s)
709 {
710 }
711 
712 static inline int
713 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
714                  struct nfs_commit_info *cinfo)
715 {
716         return PNFS_NOT_ATTEMPTED;
717 }
718 
719 static inline struct pnfs_ds_commit_info *
720 pnfs_get_ds_info(struct inode *inode)
721 {
722         return NULL;
723 }
724 
725 static inline bool
726 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
727                          struct nfs_commit_info *cinfo, u32 ds_commit_idx)
728 {
729         return false;
730 }
731 
732 static inline bool
733 pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
734 {
735         return false;
736 }
737 
738 static inline int
739 pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
740                        int max)
741 {
742         return 0;
743 }
744 
745 static inline struct nfs_page *
746 pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo,
747                         struct page *page)
748 {
749         return NULL;
750 }
751 
752 static inline int pnfs_layoutcommit_inode(struct inode *inode, bool sync)
753 {
754         return 0;
755 }
756 
757 static inline bool
758 pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
759                    struct nfs_server *nfss)
760 {
761         return false;
762 }
763 
764 static inline struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
765 {
766         return NULL;
767 }
768 
769 static inline void nfs4_pnfs_v3_ds_connect_unload(void)
770 {
771 }
772 
773 static inline bool nfs4_refresh_layout_stateid(nfs4_stateid *dst,
774                 struct inode *inode)
775 {
776         return false;
777 }
778 #endif /* CONFIG_NFS_V4_1 */
779 
780 #if IS_ENABLED(CONFIG_NFS_V4_2)
781 int pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags);
782 #else
783 static inline int
784 pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags)
785 {
786         return 0;
787 }
788 #endif
789 
790 #endif /* FS_NFS_PNFS_H */
791 

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