Commit | Line | Data |
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85e174ba RL |
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 | ||
45df3c8b | 33 | #include <linux/nfs_fs.h> |
94ad1c80 FI |
34 | #include <linux/nfs_page.h> |
35 | ||
4541d16c FI |
36 | enum { |
37 | NFS_LSEG_VALID = 0, /* cleared when lseg is recalled/returned */ | |
f7e8917a | 38 | NFS_LSEG_ROC, /* roc bit received from server */ |
4541d16c FI |
39 | }; |
40 | ||
974cec8c | 41 | struct pnfs_layout_segment { |
566052c5 FI |
42 | struct list_head pls_list; |
43 | struct pnfs_layout_range pls_range; | |
4541d16c FI |
44 | atomic_t pls_refcount; |
45 | unsigned long pls_flags; | |
566052c5 | 46 | struct pnfs_layout_hdr *pls_layout; |
863a3c6c AA |
47 | struct rpc_cred *pls_lc_cred; /* LAYOUTCOMMIT credential */ |
48 | loff_t pls_end_pos; /* LAYOUTCOMMIT write end */ | |
974cec8c AA |
49 | }; |
50 | ||
64419a9b AA |
51 | enum pnfs_try_status { |
52 | PNFS_ATTEMPTED = 0, | |
53 | PNFS_NOT_ATTEMPTED = 1, | |
54 | }; | |
55 | ||
85e174ba RL |
56 | #ifdef CONFIG_NFS_V4_1 |
57 | ||
58 | #define LAYOUT_NFSV4_1_MODULE_PREFIX "nfs-layouttype4" | |
59 | ||
e5e94017 BH |
60 | enum { |
61 | NFS_LAYOUT_RO_FAILED = 0, /* get ro layout failed stop trying */ | |
62 | NFS_LAYOUT_RW_FAILED, /* get rw layout failed stop trying */ | |
43f1b3da | 63 | NFS_LAYOUT_BULK_RECALL, /* bulk recall affecting layout */ |
f7e8917a | 64 | NFS_LAYOUT_ROC, /* some lseg had roc bit set */ |
4541d16c | 65 | NFS_LAYOUT_DESTROYED, /* no new use of layout allowed */ |
e5e94017 BH |
66 | }; |
67 | ||
8a1636c4 BH |
68 | enum 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 | ||
1775bc34 BH |
73 | struct nfs4_deviceid_node; |
74 | ||
85e174ba RL |
75 | /* Per-layout driver specific registration structure */ |
76 | struct pnfs_layoutdriver_type { | |
02c35fca FI |
77 | struct list_head pnfs_tblid; |
78 | const u32 id; | |
79 | const char *name; | |
80 | struct module *owner; | |
8a1636c4 | 81 | unsigned flags; |
636fb9c8 BH |
82 | |
83 | struct pnfs_layout_hdr * (*alloc_layout_hdr) (struct inode *inode, gfp_t gfp_flags); | |
84 | void (*free_layout_hdr) (struct pnfs_layout_hdr *); | |
85 | ||
a75b9df9 | 86 | struct pnfs_layout_segment * (*alloc_lseg) (struct pnfs_layout_hdr *layoutid, struct nfs4_layoutget_res *lgr, gfp_t gfp_flags); |
b1f69b75 | 87 | void (*free_lseg) (struct pnfs_layout_segment *lseg); |
94ad1c80 FI |
88 | |
89 | /* test for nfs page cache coalescing */ | |
90 | int (*pg_test)(struct nfs_pageio_descriptor *, struct nfs_page *, struct nfs_page *); | |
64419a9b | 91 | |
a861a1e1 FI |
92 | /* Returns true if layoutdriver wants to divert this request to |
93 | * driver's commit routine. | |
94 | */ | |
95 | bool (*mark_pnfs_commit)(struct pnfs_layout_segment *lseg); | |
96 | struct list_head * (*choose_commit_list) (struct nfs_page *req); | |
97 | int (*commit_pagelist)(struct inode *inode, struct list_head *mds_pages, int how); | |
98 | ||
64419a9b AA |
99 | /* |
100 | * Return PNFS_ATTEMPTED to indicate the layout code has attempted | |
101 | * I/O, else return PNFS_NOT_ATTEMPTED to fall back to normal NFS | |
102 | */ | |
103 | enum pnfs_try_status (*read_pagelist) (struct nfs_read_data *nfs_data); | |
0382b744 | 104 | enum pnfs_try_status (*write_pagelist) (struct nfs_write_data *nfs_data, int how); |
1775bc34 BH |
105 | |
106 | void (*free_deviceid_node) (struct nfs4_deviceid_node *); | |
04a55549 AA |
107 | |
108 | void (*encode_layoutreturn) (struct pnfs_layout_hdr *layoutid, | |
109 | struct xdr_stream *xdr, | |
110 | const struct nfs4_layoutreturn_args *args); | |
85e174ba RL |
111 | }; |
112 | ||
e5e94017 | 113 | struct pnfs_layout_hdr { |
cc6e5340 | 114 | atomic_t plh_refcount; |
b7edfaa1 | 115 | struct list_head plh_layouts; /* other client layouts */ |
43f1b3da | 116 | struct list_head plh_bulk_recall; /* clnt list of bulk recalls */ |
b7edfaa1 | 117 | struct list_head plh_segs; /* layout segments list */ |
b7edfaa1 | 118 | nfs4_stateid plh_stateid; |
cf7d63f1 | 119 | atomic_t plh_outstanding; /* number of RPCs out */ |
f7e8917a | 120 | unsigned long plh_block_lgets; /* block LAYOUTGET if >0 */ |
43f1b3da | 121 | u32 plh_barrier; /* ignore lower seqids */ |
566052c5 | 122 | unsigned long plh_flags; |
b7edfaa1 | 123 | struct inode *plh_inode; |
e5e94017 BH |
124 | }; |
125 | ||
b1f69b75 AA |
126 | struct pnfs_device { |
127 | struct nfs4_deviceid dev_id; | |
128 | unsigned int layout_type; | |
129 | unsigned int mincount; | |
130 | struct page **pages; | |
b1f69b75 AA |
131 | unsigned int pgbase; |
132 | unsigned int pglen; | |
133 | }; | |
134 | ||
02c35fca FI |
135 | extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *); |
136 | extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *); | |
137 | ||
b1f69b75 AA |
138 | /* nfs4proc.c */ |
139 | extern int nfs4_proc_getdeviceinfo(struct nfs_server *server, | |
140 | struct pnfs_device *dev); | |
141 | extern int nfs4_proc_layoutget(struct nfs4_layoutget *lgp); | |
cbe82603 | 142 | extern int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp); |
b1f69b75 AA |
143 | |
144 | /* pnfs.c */ | |
43f1b3da | 145 | void get_layout_hdr(struct pnfs_layout_hdr *lo); |
bae724ef | 146 | void put_lseg(struct pnfs_layout_segment *lseg); |
e5e94017 BH |
147 | struct pnfs_layout_segment * |
148 | pnfs_update_layout(struct inode *ino, struct nfs_open_context *ctx, | |
fb3296eb BH |
149 | loff_t pos, u64 count, enum pnfs_iomode access_type, |
150 | gfp_t gfp_flags); | |
85e174ba RL |
151 | void set_pnfs_layoutdriver(struct nfs_server *, u32 id); |
152 | void unset_pnfs_layoutdriver(struct nfs_server *); | |
0382b744 AA |
153 | enum pnfs_try_status pnfs_try_to_write_data(struct nfs_write_data *, |
154 | const struct rpc_call_ops *, int); | |
64419a9b AA |
155 | enum pnfs_try_status pnfs_try_to_read_data(struct nfs_read_data *, |
156 | const struct rpc_call_ops *); | |
94ad1c80 | 157 | void pnfs_pageio_init_read(struct nfs_pageio_descriptor *, struct inode *); |
44b83799 | 158 | void pnfs_pageio_init_write(struct nfs_pageio_descriptor *, struct inode *); |
b1f69b75 | 159 | int pnfs_layout_process(struct nfs4_layoutget *lgp); |
43f1b3da | 160 | void pnfs_free_lseg_list(struct list_head *tmp_list); |
e5e94017 | 161 | void pnfs_destroy_layout(struct nfs_inode *); |
974cec8c | 162 | void pnfs_destroy_all_layouts(struct nfs_client *); |
cc6e5340 | 163 | void put_layout_hdr(struct pnfs_layout_hdr *lo); |
43f1b3da FI |
164 | void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, |
165 | const nfs4_stateid *new, | |
166 | bool update_barrier); | |
fd6002e9 FI |
167 | int pnfs_choose_layoutget_stateid(nfs4_stateid *dst, |
168 | struct pnfs_layout_hdr *lo, | |
169 | struct nfs4_state *open_state); | |
43f1b3da FI |
170 | int mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo, |
171 | struct list_head *tmp_list, | |
778b5502 | 172 | struct pnfs_layout_range *recall_range); |
f7e8917a FI |
173 | bool pnfs_roc(struct inode *ino); |
174 | void pnfs_roc_release(struct inode *ino); | |
175 | void pnfs_roc_set_barrier(struct inode *ino, u32 barrier); | |
176 | bool pnfs_roc_drain(struct inode *ino, u32 *barrier); | |
863a3c6c | 177 | void pnfs_set_layoutcommit(struct nfs_write_data *wdata); |
ef311537 | 178 | int pnfs_layoutcommit_inode(struct inode *inode, bool sync); |
cbe82603 | 179 | int _pnfs_return_layout(struct inode *); |
d20581aa BH |
180 | int pnfs_ld_write_done(struct nfs_write_data *); |
181 | int pnfs_ld_read_done(struct nfs_read_data *); | |
e5e94017 | 182 | |
a1eaecbc BH |
183 | /* pnfs_dev.c */ |
184 | struct nfs4_deviceid_node { | |
185 | struct hlist_node node; | |
1775bc34 | 186 | const struct pnfs_layoutdriver_type *ld; |
a1eaecbc BH |
187 | const struct nfs_client *nfs_client; |
188 | struct nfs4_deviceid deviceid; | |
189 | atomic_t ref; | |
190 | }; | |
191 | ||
192 | void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id); | |
35c8bb54 BH |
193 | struct nfs4_deviceid_node *nfs4_find_get_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *); |
194 | struct nfs4_deviceid_node *nfs4_unhash_put_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *); | |
195 | void nfs4_delete_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *); | |
a1eaecbc | 196 | void nfs4_init_deviceid_node(struct nfs4_deviceid_node *, |
1775bc34 | 197 | const struct pnfs_layoutdriver_type *, |
a1eaecbc BH |
198 | const struct nfs_client *, |
199 | const struct nfs4_deviceid *); | |
200 | struct nfs4_deviceid_node *nfs4_insert_deviceid_node(struct nfs4_deviceid_node *); | |
201 | bool nfs4_put_deviceid_node(struct nfs4_deviceid_node *); | |
1775bc34 | 202 | void nfs4_deviceid_purge_client(const struct nfs_client *); |
a1eaecbc | 203 | |
e5e94017 BH |
204 | static inline int lo_fail_bit(u32 iomode) |
205 | { | |
206 | return iomode == IOMODE_RW ? | |
207 | NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED; | |
208 | } | |
209 | ||
d684d2ae FI |
210 | static inline struct pnfs_layout_segment * |
211 | get_lseg(struct pnfs_layout_segment *lseg) | |
212 | { | |
213 | if (lseg) { | |
214 | atomic_inc(&lseg->pls_refcount); | |
215 | smp_mb__after_atomic_inc(); | |
216 | } | |
217 | return lseg; | |
218 | } | |
219 | ||
e5e94017 BH |
220 | /* Return true if a layout driver is being used for this mountpoint */ |
221 | static inline int pnfs_enabled_sb(struct nfs_server *nfss) | |
222 | { | |
223 | return nfss->pnfs_curr_ld != NULL; | |
224 | } | |
85e174ba | 225 | |
a861a1e1 FI |
226 | static inline void |
227 | pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg) | |
228 | { | |
229 | if (lseg) { | |
230 | struct pnfs_layoutdriver_type *ld; | |
231 | ||
232 | ld = NFS_SERVER(req->wb_page->mapping->host)->pnfs_curr_ld; | |
233 | if (ld->mark_pnfs_commit && ld->mark_pnfs_commit(lseg)) { | |
234 | set_bit(PG_PNFS_COMMIT, &req->wb_flags); | |
235 | req->wb_commit_lseg = get_lseg(lseg); | |
236 | } | |
237 | } | |
238 | } | |
239 | ||
240 | static inline int | |
241 | pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how) | |
242 | { | |
243 | if (!test_and_clear_bit(NFS_INO_PNFS_COMMIT, &NFS_I(inode)->flags)) | |
244 | return PNFS_NOT_ATTEMPTED; | |
245 | return NFS_SERVER(inode)->pnfs_curr_ld->commit_pagelist(inode, mds_pages, how); | |
246 | } | |
247 | ||
248 | static inline struct list_head * | |
249 | pnfs_choose_commit_list(struct nfs_page *req, struct list_head *mds) | |
250 | { | |
251 | struct list_head *rv; | |
252 | ||
253 | if (test_and_clear_bit(PG_PNFS_COMMIT, &req->wb_flags)) { | |
254 | struct inode *inode = req->wb_commit_lseg->pls_layout->plh_inode; | |
255 | ||
256 | set_bit(NFS_INO_PNFS_COMMIT, &NFS_I(inode)->flags); | |
257 | rv = NFS_SERVER(inode)->pnfs_curr_ld->choose_commit_list(req); | |
258 | /* matched by ref taken when PG_PNFS_COMMIT is set */ | |
259 | put_lseg(req->wb_commit_lseg); | |
260 | } else | |
261 | rv = mds; | |
262 | return rv; | |
263 | } | |
264 | ||
265 | static inline void pnfs_clear_request_commit(struct nfs_page *req) | |
266 | { | |
267 | if (test_and_clear_bit(PG_PNFS_COMMIT, &req->wb_flags)) | |
268 | put_lseg(req->wb_commit_lseg); | |
269 | } | |
270 | ||
8a1636c4 BH |
271 | /* Should the pNFS client commit and return the layout upon a setattr */ |
272 | static inline bool | |
273 | pnfs_ld_layoutret_on_setattr(struct inode *inode) | |
274 | { | |
275 | if (!pnfs_enabled_sb(NFS_SERVER(inode))) | |
276 | return false; | |
277 | return NFS_SERVER(inode)->pnfs_curr_ld->flags & | |
278 | PNFS_LAYOUTRET_ON_SETATTR; | |
279 | } | |
280 | ||
cbe82603 BH |
281 | static inline int pnfs_return_layout(struct inode *ino) |
282 | { | |
283 | struct nfs_inode *nfsi = NFS_I(ino); | |
284 | struct nfs_server *nfss = NFS_SERVER(ino); | |
285 | ||
286 | if (pnfs_enabled_sb(nfss) && nfsi->layout) | |
287 | return _pnfs_return_layout(ino); | |
288 | ||
289 | return 0; | |
290 | } | |
291 | ||
85e174ba RL |
292 | #else /* CONFIG_NFS_V4_1 */ |
293 | ||
974cec8c AA |
294 | static inline void pnfs_destroy_all_layouts(struct nfs_client *clp) |
295 | { | |
296 | } | |
297 | ||
e5e94017 BH |
298 | static inline void pnfs_destroy_layout(struct nfs_inode *nfsi) |
299 | { | |
300 | } | |
301 | ||
d684d2ae FI |
302 | static inline struct pnfs_layout_segment * |
303 | get_lseg(struct pnfs_layout_segment *lseg) | |
304 | { | |
305 | return NULL; | |
306 | } | |
307 | ||
308 | static inline void put_lseg(struct pnfs_layout_segment *lseg) | |
309 | { | |
310 | } | |
311 | ||
e5e94017 BH |
312 | static inline struct pnfs_layout_segment * |
313 | pnfs_update_layout(struct inode *ino, struct nfs_open_context *ctx, | |
fb3296eb BH |
314 | loff_t pos, u64 count, enum pnfs_iomode access_type, |
315 | gfp_t gfp_flags) | |
e5e94017 BH |
316 | { |
317 | return NULL; | |
318 | } | |
319 | ||
64419a9b AA |
320 | static inline enum pnfs_try_status |
321 | pnfs_try_to_read_data(struct nfs_read_data *data, | |
322 | const struct rpc_call_ops *call_ops) | |
323 | { | |
324 | return PNFS_NOT_ATTEMPTED; | |
325 | } | |
326 | ||
0382b744 AA |
327 | static inline enum pnfs_try_status |
328 | pnfs_try_to_write_data(struct nfs_write_data *data, | |
329 | const struct rpc_call_ops *call_ops, int how) | |
330 | { | |
331 | return PNFS_NOT_ATTEMPTED; | |
332 | } | |
333 | ||
cbe82603 BH |
334 | static inline int pnfs_return_layout(struct inode *ino) |
335 | { | |
336 | return 0; | |
337 | } | |
338 | ||
8a1636c4 BH |
339 | static inline bool |
340 | pnfs_ld_layoutret_on_setattr(struct inode *inode) | |
341 | { | |
342 | return false; | |
343 | } | |
344 | ||
f7e8917a FI |
345 | static inline bool |
346 | pnfs_roc(struct inode *ino) | |
347 | { | |
348 | return false; | |
349 | } | |
350 | ||
351 | static inline void | |
352 | pnfs_roc_release(struct inode *ino) | |
353 | { | |
354 | } | |
355 | ||
356 | static inline void | |
357 | pnfs_roc_set_barrier(struct inode *ino, u32 barrier) | |
358 | { | |
359 | } | |
360 | ||
361 | static inline bool | |
362 | pnfs_roc_drain(struct inode *ino, u32 *barrier) | |
363 | { | |
364 | return false; | |
365 | } | |
366 | ||
85e174ba RL |
367 | static inline void set_pnfs_layoutdriver(struct nfs_server *s, u32 id) |
368 | { | |
369 | } | |
370 | ||
371 | static inline void unset_pnfs_layoutdriver(struct nfs_server *s) | |
372 | { | |
373 | } | |
374 | ||
94ad1c80 FI |
375 | static inline void |
376 | pnfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, struct inode *ino) | |
377 | { | |
378 | pgio->pg_test = NULL; | |
379 | } | |
380 | ||
44b83799 FI |
381 | static inline void |
382 | pnfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, struct inode *ino) | |
383 | { | |
384 | pgio->pg_test = NULL; | |
385 | } | |
386 | ||
a861a1e1 FI |
387 | static inline void |
388 | pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg) | |
389 | { | |
390 | } | |
391 | ||
392 | static inline int | |
393 | pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how) | |
394 | { | |
395 | return PNFS_NOT_ATTEMPTED; | |
396 | } | |
397 | ||
398 | static inline struct list_head * | |
399 | pnfs_choose_commit_list(struct nfs_page *req, struct list_head *mds) | |
400 | { | |
401 | return mds; | |
402 | } | |
403 | ||
404 | static inline void pnfs_clear_request_commit(struct nfs_page *req) | |
405 | { | |
406 | } | |
407 | ||
ef311537 | 408 | static inline int pnfs_layoutcommit_inode(struct inode *inode, bool sync) |
863a3c6c AA |
409 | { |
410 | return 0; | |
411 | } | |
1775bc34 BH |
412 | |
413 | static inline void nfs4_deviceid_purge_client(struct nfs_client *ncl) | |
414 | { | |
415 | } | |
85e174ba RL |
416 | #endif /* CONFIG_NFS_V4_1 */ |
417 | ||
418 | #endif /* FS_NFS_PNFS_H */ |