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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,
38 NFS_LSEG_ROC,
39 NFS_LSEG_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,
62 NFS_LAYOUT_RW_FAILED,
63 NFS_LAYOUT_BULK_RECALL,
64 NFS_LAYOUT_ROC,
65 NFS_LAYOUT_RETURN,
66};
67
68enum layoutdriver_policy_flags {
69
70 PNFS_LAYOUTRET_ON_SETATTR = 1 << 0,
71 PNFS_LAYOUTRET_ON_ERROR = 1 << 1,
72};
73
74struct nfs4_deviceid_node;
75
76
77struct pnfs_layoutdriver_type {
78 struct list_head pnfs_tblid;
79 const u32 id;
80 const char *name;
81 struct module *owner;
82 unsigned flags;
83
84 int (*set_layoutdriver) (struct nfs_server *, const struct nfs_fh *);
85 int (*clear_layoutdriver) (struct nfs_server *);
86
87 struct pnfs_layout_hdr * (*alloc_layout_hdr) (struct inode *inode, gfp_t gfp_flags);
88 void (*free_layout_hdr) (struct pnfs_layout_hdr *);
89
90 struct pnfs_layout_segment * (*alloc_lseg) (struct pnfs_layout_hdr *layoutid, struct nfs4_layoutget_res *lgr, gfp_t gfp_flags);
91 void (*free_lseg) (struct pnfs_layout_segment *lseg);
92
93
94 const struct nfs_pageio_ops *pg_read_ops;
95 const struct nfs_pageio_ops *pg_write_ops;
96
97 struct pnfs_ds_commit_info *(*get_ds_info) (struct inode *inode);
98 void (*mark_request_commit) (struct nfs_page *req,
99 struct pnfs_layout_segment *lseg,
100 struct nfs_commit_info *cinfo);
101 void (*clear_request_commit) (struct nfs_page *req,
102 struct nfs_commit_info *cinfo);
103 int (*scan_commit_lists) (struct nfs_commit_info *cinfo,
104 int max);
105 void (*recover_commit_reqs) (struct list_head *list,
106 struct nfs_commit_info *cinfo);
107 int (*commit_pagelist)(struct inode *inode,
108 struct list_head *mds_pages,
109 int how,
110 struct nfs_commit_info *cinfo);
111
112
113
114
115
116 enum pnfs_try_status (*read_pagelist) (struct nfs_read_data *nfs_data);
117 enum pnfs_try_status (*write_pagelist) (struct nfs_write_data *nfs_data, int how);
118
119 void (*free_deviceid_node) (struct nfs4_deviceid_node *);
120
121 void (*encode_layoutreturn) (struct pnfs_layout_hdr *layoutid,
122 struct xdr_stream *xdr,
123 const struct nfs4_layoutreturn_args *args);
124
125 void (*cleanup_layoutcommit) (struct nfs4_layoutcommit_data *data);
126
127 void (*encode_layoutcommit) (struct pnfs_layout_hdr *layoutid,
128 struct xdr_stream *xdr,
129 const struct nfs4_layoutcommit_args *args);
130};
131
132struct pnfs_layout_hdr {
133 atomic_t plh_refcount;
134 struct list_head plh_layouts;
135 struct list_head plh_bulk_destroy;
136 struct list_head plh_segs;
137 nfs4_stateid plh_stateid;
138 atomic_t plh_outstanding;
139 unsigned long plh_block_lgets;
140 u32 plh_barrier;
141 unsigned long plh_retry_timestamp;
142 unsigned long plh_flags;
143 loff_t plh_lwb;
144 struct rpc_cred *plh_lc_cred;
145 struct inode *plh_inode;
146};
147
148struct pnfs_device {
149 struct nfs4_deviceid dev_id;
150 unsigned int layout_type;
151 unsigned int mincount;
152 unsigned int maxcount;
153 struct page **pages;
154 unsigned int pgbase;
155 unsigned int pglen;
156};
157
158#define NFS4_PNFS_GETDEVLIST_MAXNUM 16
159
160struct pnfs_devicelist {
161 unsigned int eof;
162 unsigned int num_devs;
163 struct nfs4_deviceid dev_id[NFS4_PNFS_GETDEVLIST_MAXNUM];
164};
165
166extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *);
167extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *);
168
169
170extern int nfs4_proc_getdevicelist(struct nfs_server *server,
171 const struct nfs_fh *fh,
172 struct pnfs_devicelist *devlist);
173extern int nfs4_proc_getdeviceinfo(struct nfs_server *server,
174 struct pnfs_device *dev,
175 struct rpc_cred *cred);
176extern struct pnfs_layout_segment* nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags);
177extern int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp);
178
179
180void pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo);
181void pnfs_put_lseg(struct pnfs_layout_segment *lseg);
182
183void pnfs_pageio_init_read(struct nfs_pageio_descriptor *, struct inode *,
184 const struct nfs_pgio_completion_ops *);
185void pnfs_pageio_init_write(struct nfs_pageio_descriptor *, struct inode *,
186 int, const struct nfs_pgio_completion_ops *);
187
188void set_pnfs_layoutdriver(struct nfs_server *, const struct nfs_fh *, u32);
189void unset_pnfs_layoutdriver(struct nfs_server *);
190void pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *, struct nfs_page *);
191int pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc);
192void pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
193 struct nfs_page *req, u64 wb_size);
194int pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc);
195bool pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, struct nfs_page *req);
196void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg);
197struct pnfs_layout_segment *pnfs_layout_process(struct nfs4_layoutget *lgp);
198void pnfs_free_lseg_list(struct list_head *tmp_list);
199void pnfs_destroy_layout(struct nfs_inode *);
200void pnfs_destroy_all_layouts(struct nfs_client *);
201int pnfs_destroy_layouts_byfsid(struct nfs_client *clp,
202 struct nfs_fsid *fsid,
203 bool is_recall);
204int pnfs_destroy_layouts_byclid(struct nfs_client *clp,
205 bool is_recall);
206void pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo);
207void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo,
208 const nfs4_stateid *new,
209 bool update_barrier);
210int pnfs_choose_layoutget_stateid(nfs4_stateid *dst,
211 struct pnfs_layout_hdr *lo,
212 struct nfs4_state *open_state);
213int pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
214 struct list_head *tmp_list,
215 struct pnfs_layout_range *recall_range);
216bool pnfs_roc(struct inode *ino);
217void pnfs_roc_release(struct inode *ino);
218void pnfs_roc_set_barrier(struct inode *ino, u32 barrier);
219bool pnfs_roc_drain(struct inode *ino, u32 *barrier, struct rpc_task *task);
220void pnfs_set_layoutcommit(struct nfs_write_data *wdata);
221void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data);
222int pnfs_layoutcommit_inode(struct inode *inode, bool sync);
223int _pnfs_return_layout(struct inode *);
224int pnfs_commit_and_return_layout(struct inode *);
225void pnfs_ld_write_done(struct nfs_write_data *);
226void pnfs_ld_read_done(struct nfs_read_data *);
227struct pnfs_layout_segment *pnfs_update_layout(struct inode *ino,
228 struct nfs_open_context *ctx,
229 loff_t pos,
230 u64 count,
231 enum pnfs_iomode iomode,
232 gfp_t gfp_flags);
233
234void nfs4_deviceid_mark_client_invalid(struct nfs_client *clp);
235int pnfs_read_done_resend_to_mds(struct inode *inode, struct list_head *head,
236 const struct nfs_pgio_completion_ops *compl_ops,
237 struct nfs_direct_req *dreq);
238int pnfs_write_done_resend_to_mds(struct inode *inode, struct list_head *head,
239 const struct nfs_pgio_completion_ops *compl_ops,
240 struct nfs_direct_req *dreq);
241struct nfs4_threshold *pnfs_mdsthreshold_alloc(void);
242
243
244enum {
245 NFS_DEVICEID_INVALID = 0,
246 NFS_DEVICEID_UNAVAILABLE,
247};
248
249
250struct nfs4_deviceid_node {
251 struct hlist_node node;
252 struct hlist_node tmpnode;
253 const struct pnfs_layoutdriver_type *ld;
254 const struct nfs_client *nfs_client;
255 unsigned long flags;
256 unsigned long timestamp_unavailable;
257 struct nfs4_deviceid deviceid;
258 atomic_t ref;
259};
260
261struct nfs4_deviceid_node *nfs4_find_get_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
262void nfs4_delete_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
263void nfs4_init_deviceid_node(struct nfs4_deviceid_node *,
264 const struct pnfs_layoutdriver_type *,
265 const struct nfs_client *,
266 const struct nfs4_deviceid *);
267struct nfs4_deviceid_node *nfs4_insert_deviceid_node(struct nfs4_deviceid_node *);
268bool nfs4_put_deviceid_node(struct nfs4_deviceid_node *);
269void nfs4_mark_deviceid_unavailable(struct nfs4_deviceid_node *node);
270bool nfs4_test_deviceid_unavailable(struct nfs4_deviceid_node *node);
271void nfs4_deviceid_purge_client(const struct nfs_client *);
272
273static inline struct pnfs_layout_segment *
274pnfs_get_lseg(struct pnfs_layout_segment *lseg)
275{
276 if (lseg) {
277 atomic_inc(&lseg->pls_refcount);
278 smp_mb__after_atomic_inc();
279 }
280 return lseg;
281}
282
283
284static inline int pnfs_enabled_sb(struct nfs_server *nfss)
285{
286 return nfss->pnfs_curr_ld != NULL;
287}
288
289static inline int
290pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
291 struct nfs_commit_info *cinfo)
292{
293 if (cinfo->ds == NULL || cinfo->ds->ncommitting == 0)
294 return PNFS_NOT_ATTEMPTED;
295 return NFS_SERVER(inode)->pnfs_curr_ld->commit_pagelist(inode, mds_pages, how, cinfo);
296}
297
298static inline struct pnfs_ds_commit_info *
299pnfs_get_ds_info(struct inode *inode)
300{
301 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
302
303 if (ld == NULL || ld->get_ds_info == NULL)
304 return NULL;
305 return ld->get_ds_info(inode);
306}
307
308static inline bool
309pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
310 struct nfs_commit_info *cinfo)
311{
312 struct inode *inode = req->wb_context->dentry->d_inode;
313 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
314
315 if (lseg == NULL || ld->mark_request_commit == NULL)
316 return false;
317 ld->mark_request_commit(req, lseg, cinfo);
318 return true;
319}
320
321static inline bool
322pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
323{
324 struct inode *inode = req->wb_context->dentry->d_inode;
325 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
326
327 if (ld == NULL || ld->clear_request_commit == NULL)
328 return false;
329 ld->clear_request_commit(req, cinfo);
330 return true;
331}
332
333static inline int
334pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
335 int max)
336{
337 if (cinfo->ds == NULL || cinfo->ds->nwritten == 0)
338 return 0;
339 else
340 return NFS_SERVER(inode)->pnfs_curr_ld->scan_commit_lists(cinfo, max);
341}
342
343static inline void
344pnfs_recover_commit_reqs(struct inode *inode, struct list_head *list,
345 struct nfs_commit_info *cinfo)
346{
347 if (cinfo->ds == NULL || cinfo->ds->nwritten == 0)
348 return;
349 NFS_SERVER(inode)->pnfs_curr_ld->recover_commit_reqs(list, cinfo);
350}
351
352
353static inline bool
354pnfs_ld_layoutret_on_setattr(struct inode *inode)
355{
356 if (!pnfs_enabled_sb(NFS_SERVER(inode)))
357 return false;
358 return NFS_SERVER(inode)->pnfs_curr_ld->flags &
359 PNFS_LAYOUTRET_ON_SETATTR;
360}
361
362static inline int pnfs_return_layout(struct inode *ino)
363{
364 struct nfs_inode *nfsi = NFS_I(ino);
365 struct nfs_server *nfss = NFS_SERVER(ino);
366
367 if (pnfs_enabled_sb(nfss) && nfsi->layout)
368 return _pnfs_return_layout(ino);
369
370 return 0;
371}
372
373static inline bool
374pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
375 struct nfs_server *nfss)
376{
377 return (dst && src && src->bm != 0 && nfss->pnfs_curr_ld &&
378 nfss->pnfs_curr_ld->id == src->l_type);
379}
380
381#ifdef NFS_DEBUG
382void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id);
383#else
384static inline void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id)
385{
386}
387#endif
388#else
389
390static inline void pnfs_destroy_all_layouts(struct nfs_client *clp)
391{
392}
393
394static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
395{
396}
397
398static inline struct pnfs_layout_segment *
399pnfs_get_lseg(struct pnfs_layout_segment *lseg)
400{
401 return NULL;
402}
403
404static inline void pnfs_put_lseg(struct pnfs_layout_segment *lseg)
405{
406}
407
408static inline int pnfs_return_layout(struct inode *ino)
409{
410 return 0;
411}
412
413static inline int pnfs_commit_and_return_layout(struct inode *inode)
414{
415 return 0;
416}
417
418static inline bool
419pnfs_ld_layoutret_on_setattr(struct inode *inode)
420{
421 return false;
422}
423
424static inline bool
425pnfs_roc(struct inode *ino)
426{
427 return false;
428}
429
430static inline void
431pnfs_roc_release(struct inode *ino)
432{
433}
434
435static inline void
436pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
437{
438}
439
440static inline bool
441pnfs_roc_drain(struct inode *ino, u32 *barrier, struct rpc_task *task)
442{
443 return false;
444}
445
446static inline void set_pnfs_layoutdriver(struct nfs_server *s,
447 const struct nfs_fh *mntfh, u32 id)
448{
449}
450
451static inline void unset_pnfs_layoutdriver(struct nfs_server *s)
452{
453}
454
455static inline void pnfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, struct inode *inode,
456 const struct nfs_pgio_completion_ops *compl_ops)
457{
458 nfs_pageio_init_read(pgio, inode, compl_ops);
459}
460
461static inline void pnfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, struct inode *inode, int ioflags,
462 const struct nfs_pgio_completion_ops *compl_ops)
463{
464 nfs_pageio_init_write(pgio, inode, ioflags, compl_ops);
465}
466
467static inline int
468pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
469 struct nfs_commit_info *cinfo)
470{
471 return PNFS_NOT_ATTEMPTED;
472}
473
474static inline struct pnfs_ds_commit_info *
475pnfs_get_ds_info(struct inode *inode)
476{
477 return NULL;
478}
479
480static inline bool
481pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
482 struct nfs_commit_info *cinfo)
483{
484 return false;
485}
486
487static inline bool
488pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
489{
490 return false;
491}
492
493static inline int
494pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
495 int max)
496{
497 return 0;
498}
499
500static inline void
501pnfs_recover_commit_reqs(struct inode *inode, struct list_head *list,
502 struct nfs_commit_info *cinfo)
503{
504}
505
506static inline int pnfs_layoutcommit_inode(struct inode *inode, bool sync)
507{
508 return 0;
509}
510
511static inline bool
512pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
513 struct nfs_server *nfss)
514{
515 return false;
516}
517
518static inline struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
519{
520 return NULL;
521}
522
523#endif
524
525#endif
526