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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 */ | |
1751c363 TM |
90 | const struct nfs_pageio_ops *pg_read_ops; |
91 | const struct nfs_pageio_ops *pg_write_ops; | |
64419a9b | 92 | |
a861a1e1 FI |
93 | /* Returns true if layoutdriver wants to divert this request to |
94 | * driver's commit routine. | |
95 | */ | |
96 | bool (*mark_pnfs_commit)(struct pnfs_layout_segment *lseg); | |
97 | struct list_head * (*choose_commit_list) (struct nfs_page *req); | |
98 | int (*commit_pagelist)(struct inode *inode, struct list_head *mds_pages, int how); | |
99 | ||
64419a9b AA |
100 | /* |
101 | * Return PNFS_ATTEMPTED to indicate the layout code has attempted | |
102 | * I/O, else return PNFS_NOT_ATTEMPTED to fall back to normal NFS | |
103 | */ | |
104 | enum pnfs_try_status (*read_pagelist) (struct nfs_read_data *nfs_data); | |
0382b744 | 105 | enum pnfs_try_status (*write_pagelist) (struct nfs_write_data *nfs_data, int how); |
1775bc34 BH |
106 | |
107 | void (*free_deviceid_node) (struct nfs4_deviceid_node *); | |
04a55549 AA |
108 | |
109 | void (*encode_layoutreturn) (struct pnfs_layout_hdr *layoutid, | |
110 | struct xdr_stream *xdr, | |
111 | const struct nfs4_layoutreturn_args *args); | |
ac7db726 BH |
112 | |
113 | void (*encode_layoutcommit) (struct pnfs_layout_hdr *layoutid, | |
114 | struct xdr_stream *xdr, | |
115 | const struct nfs4_layoutcommit_args *args); | |
85e174ba RL |
116 | }; |
117 | ||
e5e94017 | 118 | struct pnfs_layout_hdr { |
cc6e5340 | 119 | atomic_t plh_refcount; |
b7edfaa1 | 120 | struct list_head plh_layouts; /* other client layouts */ |
43f1b3da | 121 | struct list_head plh_bulk_recall; /* clnt list of bulk recalls */ |
b7edfaa1 | 122 | struct list_head plh_segs; /* layout segments list */ |
b7edfaa1 | 123 | nfs4_stateid plh_stateid; |
cf7d63f1 | 124 | atomic_t plh_outstanding; /* number of RPCs out */ |
f7e8917a | 125 | unsigned long plh_block_lgets; /* block LAYOUTGET if >0 */ |
43f1b3da | 126 | u32 plh_barrier; /* ignore lower seqids */ |
566052c5 | 127 | unsigned long plh_flags; |
b7edfaa1 | 128 | struct inode *plh_inode; |
e5e94017 BH |
129 | }; |
130 | ||
b1f69b75 AA |
131 | struct pnfs_device { |
132 | struct nfs4_deviceid dev_id; | |
133 | unsigned int layout_type; | |
134 | unsigned int mincount; | |
135 | struct page **pages; | |
b1f69b75 AA |
136 | unsigned int pgbase; |
137 | unsigned int pglen; | |
138 | }; | |
139 | ||
02c35fca FI |
140 | extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *); |
141 | extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *); | |
142 | ||
b1f69b75 AA |
143 | /* nfs4proc.c */ |
144 | extern int nfs4_proc_getdeviceinfo(struct nfs_server *server, | |
145 | struct pnfs_device *dev); | |
146 | extern int nfs4_proc_layoutget(struct nfs4_layoutget *lgp); | |
cbe82603 | 147 | extern int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp); |
b1f69b75 AA |
148 | |
149 | /* pnfs.c */ | |
43f1b3da | 150 | void get_layout_hdr(struct pnfs_layout_hdr *lo); |
bae724ef | 151 | void put_lseg(struct pnfs_layout_segment *lseg); |
1751c363 TM |
152 | |
153 | bool pnfs_pageio_init_read(struct nfs_pageio_descriptor *, struct inode *); | |
154 | bool pnfs_pageio_init_write(struct nfs_pageio_descriptor *, struct inode *, int); | |
155 | ||
85e174ba RL |
156 | void set_pnfs_layoutdriver(struct nfs_server *, u32 id); |
157 | void unset_pnfs_layoutdriver(struct nfs_server *); | |
0382b744 AA |
158 | enum pnfs_try_status pnfs_try_to_write_data(struct nfs_write_data *, |
159 | const struct rpc_call_ops *, int); | |
64419a9b AA |
160 | enum pnfs_try_status pnfs_try_to_read_data(struct nfs_read_data *, |
161 | const struct rpc_call_ops *); | |
d8007d4d TM |
162 | void pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *, struct nfs_page *); |
163 | void pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *, struct nfs_page *); | |
18ad0a9f | 164 | bool pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, struct nfs_page *req); |
b1f69b75 | 165 | int pnfs_layout_process(struct nfs4_layoutget *lgp); |
43f1b3da | 166 | void pnfs_free_lseg_list(struct list_head *tmp_list); |
e5e94017 | 167 | void pnfs_destroy_layout(struct nfs_inode *); |
974cec8c | 168 | void pnfs_destroy_all_layouts(struct nfs_client *); |
cc6e5340 | 169 | void put_layout_hdr(struct pnfs_layout_hdr *lo); |
43f1b3da FI |
170 | void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, |
171 | const nfs4_stateid *new, | |
172 | bool update_barrier); | |
fd6002e9 FI |
173 | int pnfs_choose_layoutget_stateid(nfs4_stateid *dst, |
174 | struct pnfs_layout_hdr *lo, | |
175 | struct nfs4_state *open_state); | |
43f1b3da FI |
176 | int mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo, |
177 | struct list_head *tmp_list, | |
778b5502 | 178 | struct pnfs_layout_range *recall_range); |
f7e8917a FI |
179 | bool pnfs_roc(struct inode *ino); |
180 | void pnfs_roc_release(struct inode *ino); | |
181 | void pnfs_roc_set_barrier(struct inode *ino, u32 barrier); | |
182 | bool pnfs_roc_drain(struct inode *ino, u32 *barrier); | |
863a3c6c | 183 | void pnfs_set_layoutcommit(struct nfs_write_data *wdata); |
ef311537 | 184 | int pnfs_layoutcommit_inode(struct inode *inode, bool sync); |
cbe82603 | 185 | int _pnfs_return_layout(struct inode *); |
d20581aa BH |
186 | int pnfs_ld_write_done(struct nfs_write_data *); |
187 | int pnfs_ld_read_done(struct nfs_read_data *); | |
7c24d948 AA |
188 | struct pnfs_layout_segment *pnfs_update_layout(struct inode *ino, |
189 | struct nfs_open_context *ctx, | |
190 | loff_t pos, | |
191 | u64 count, | |
192 | enum pnfs_iomode iomode, | |
193 | gfp_t gfp_flags); | |
e5e94017 | 194 | |
c47abcf8 AA |
195 | void nfs4_deviceid_mark_client_invalid(struct nfs_client *clp); |
196 | ||
197 | /* nfs4_deviceid_flags */ | |
198 | enum { | |
199 | NFS_DEVICEID_INVALID = 0, /* set when MDS clientid recalled */ | |
200 | }; | |
201 | ||
a1eaecbc BH |
202 | /* pnfs_dev.c */ |
203 | struct nfs4_deviceid_node { | |
204 | struct hlist_node node; | |
9e3bd4e2 | 205 | struct hlist_node tmpnode; |
1775bc34 | 206 | const struct pnfs_layoutdriver_type *ld; |
a1eaecbc | 207 | const struct nfs_client *nfs_client; |
c47abcf8 | 208 | unsigned long flags; |
a1eaecbc BH |
209 | struct nfs4_deviceid deviceid; |
210 | atomic_t ref; | |
211 | }; | |
212 | ||
213 | void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id); | |
35c8bb54 | 214 | struct nfs4_deviceid_node *nfs4_find_get_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *); |
35c8bb54 | 215 | void nfs4_delete_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *); |
a1eaecbc | 216 | void nfs4_init_deviceid_node(struct nfs4_deviceid_node *, |
1775bc34 | 217 | const struct pnfs_layoutdriver_type *, |
a1eaecbc BH |
218 | const struct nfs_client *, |
219 | const struct nfs4_deviceid *); | |
220 | struct nfs4_deviceid_node *nfs4_insert_deviceid_node(struct nfs4_deviceid_node *); | |
221 | bool nfs4_put_deviceid_node(struct nfs4_deviceid_node *); | |
1775bc34 | 222 | void nfs4_deviceid_purge_client(const struct nfs_client *); |
a1eaecbc | 223 | |
e5e94017 BH |
224 | static inline int lo_fail_bit(u32 iomode) |
225 | { | |
226 | return iomode == IOMODE_RW ? | |
227 | NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED; | |
228 | } | |
229 | ||
d684d2ae FI |
230 | static inline struct pnfs_layout_segment * |
231 | get_lseg(struct pnfs_layout_segment *lseg) | |
232 | { | |
233 | if (lseg) { | |
234 | atomic_inc(&lseg->pls_refcount); | |
235 | smp_mb__after_atomic_inc(); | |
236 | } | |
237 | return lseg; | |
238 | } | |
239 | ||
e5e94017 BH |
240 | /* Return true if a layout driver is being used for this mountpoint */ |
241 | static inline int pnfs_enabled_sb(struct nfs_server *nfss) | |
242 | { | |
243 | return nfss->pnfs_curr_ld != NULL; | |
244 | } | |
85e174ba | 245 | |
a861a1e1 FI |
246 | static inline void |
247 | pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg) | |
248 | { | |
249 | if (lseg) { | |
250 | struct pnfs_layoutdriver_type *ld; | |
251 | ||
252 | ld = NFS_SERVER(req->wb_page->mapping->host)->pnfs_curr_ld; | |
253 | if (ld->mark_pnfs_commit && ld->mark_pnfs_commit(lseg)) { | |
254 | set_bit(PG_PNFS_COMMIT, &req->wb_flags); | |
255 | req->wb_commit_lseg = get_lseg(lseg); | |
256 | } | |
257 | } | |
258 | } | |
259 | ||
260 | static inline int | |
261 | pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how) | |
262 | { | |
263 | if (!test_and_clear_bit(NFS_INO_PNFS_COMMIT, &NFS_I(inode)->flags)) | |
264 | return PNFS_NOT_ATTEMPTED; | |
265 | return NFS_SERVER(inode)->pnfs_curr_ld->commit_pagelist(inode, mds_pages, how); | |
266 | } | |
267 | ||
268 | static inline struct list_head * | |
269 | pnfs_choose_commit_list(struct nfs_page *req, struct list_head *mds) | |
270 | { | |
271 | struct list_head *rv; | |
272 | ||
273 | if (test_and_clear_bit(PG_PNFS_COMMIT, &req->wb_flags)) { | |
274 | struct inode *inode = req->wb_commit_lseg->pls_layout->plh_inode; | |
275 | ||
276 | set_bit(NFS_INO_PNFS_COMMIT, &NFS_I(inode)->flags); | |
277 | rv = NFS_SERVER(inode)->pnfs_curr_ld->choose_commit_list(req); | |
278 | /* matched by ref taken when PG_PNFS_COMMIT is set */ | |
279 | put_lseg(req->wb_commit_lseg); | |
280 | } else | |
281 | rv = mds; | |
282 | return rv; | |
283 | } | |
284 | ||
285 | static inline void pnfs_clear_request_commit(struct nfs_page *req) | |
286 | { | |
287 | if (test_and_clear_bit(PG_PNFS_COMMIT, &req->wb_flags)) | |
288 | put_lseg(req->wb_commit_lseg); | |
289 | } | |
290 | ||
8a1636c4 BH |
291 | /* Should the pNFS client commit and return the layout upon a setattr */ |
292 | static inline bool | |
293 | pnfs_ld_layoutret_on_setattr(struct inode *inode) | |
294 | { | |
295 | if (!pnfs_enabled_sb(NFS_SERVER(inode))) | |
296 | return false; | |
297 | return NFS_SERVER(inode)->pnfs_curr_ld->flags & | |
298 | PNFS_LAYOUTRET_ON_SETATTR; | |
299 | } | |
300 | ||
cbe82603 BH |
301 | static inline int pnfs_return_layout(struct inode *ino) |
302 | { | |
303 | struct nfs_inode *nfsi = NFS_I(ino); | |
304 | struct nfs_server *nfss = NFS_SERVER(ino); | |
305 | ||
306 | if (pnfs_enabled_sb(nfss) && nfsi->layout) | |
307 | return _pnfs_return_layout(ino); | |
308 | ||
309 | return 0; | |
310 | } | |
311 | ||
85e174ba RL |
312 | #else /* CONFIG_NFS_V4_1 */ |
313 | ||
974cec8c AA |
314 | static inline void pnfs_destroy_all_layouts(struct nfs_client *clp) |
315 | { | |
316 | } | |
317 | ||
e5e94017 BH |
318 | static inline void pnfs_destroy_layout(struct nfs_inode *nfsi) |
319 | { | |
320 | } | |
321 | ||
d684d2ae FI |
322 | static inline struct pnfs_layout_segment * |
323 | get_lseg(struct pnfs_layout_segment *lseg) | |
324 | { | |
325 | return NULL; | |
326 | } | |
327 | ||
328 | static inline void put_lseg(struct pnfs_layout_segment *lseg) | |
329 | { | |
330 | } | |
331 | ||
64419a9b AA |
332 | static inline enum pnfs_try_status |
333 | pnfs_try_to_read_data(struct nfs_read_data *data, | |
334 | const struct rpc_call_ops *call_ops) | |
335 | { | |
336 | return PNFS_NOT_ATTEMPTED; | |
337 | } | |
338 | ||
0382b744 AA |
339 | static inline enum pnfs_try_status |
340 | pnfs_try_to_write_data(struct nfs_write_data *data, | |
341 | const struct rpc_call_ops *call_ops, int how) | |
342 | { | |
343 | return PNFS_NOT_ATTEMPTED; | |
344 | } | |
345 | ||
cbe82603 BH |
346 | static inline int pnfs_return_layout(struct inode *ino) |
347 | { | |
348 | return 0; | |
349 | } | |
350 | ||
8a1636c4 BH |
351 | static inline bool |
352 | pnfs_ld_layoutret_on_setattr(struct inode *inode) | |
353 | { | |
354 | return false; | |
355 | } | |
356 | ||
f7e8917a FI |
357 | static inline bool |
358 | pnfs_roc(struct inode *ino) | |
359 | { | |
360 | return false; | |
361 | } | |
362 | ||
363 | static inline void | |
364 | pnfs_roc_release(struct inode *ino) | |
365 | { | |
366 | } | |
367 | ||
368 | static inline void | |
369 | pnfs_roc_set_barrier(struct inode *ino, u32 barrier) | |
370 | { | |
371 | } | |
372 | ||
373 | static inline bool | |
374 | pnfs_roc_drain(struct inode *ino, u32 *barrier) | |
375 | { | |
376 | return false; | |
377 | } | |
378 | ||
85e174ba RL |
379 | static inline void set_pnfs_layoutdriver(struct nfs_server *s, u32 id) |
380 | { | |
381 | } | |
382 | ||
383 | static inline void unset_pnfs_layoutdriver(struct nfs_server *s) | |
384 | { | |
385 | } | |
386 | ||
1751c363 | 387 | static inline bool pnfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, struct inode *inode) |
44b83799 | 388 | { |
1751c363 TM |
389 | return false; |
390 | } | |
391 | ||
392 | static inline bool pnfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, struct inode *inode, int ioflags) | |
393 | { | |
394 | return false; | |
44b83799 FI |
395 | } |
396 | ||
a861a1e1 FI |
397 | static inline void |
398 | pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg) | |
399 | { | |
400 | } | |
401 | ||
402 | static inline int | |
403 | pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how) | |
404 | { | |
405 | return PNFS_NOT_ATTEMPTED; | |
406 | } | |
407 | ||
408 | static inline struct list_head * | |
409 | pnfs_choose_commit_list(struct nfs_page *req, struct list_head *mds) | |
410 | { | |
411 | return mds; | |
412 | } | |
413 | ||
414 | static inline void pnfs_clear_request_commit(struct nfs_page *req) | |
415 | { | |
416 | } | |
417 | ||
ef311537 | 418 | static inline int pnfs_layoutcommit_inode(struct inode *inode, bool sync) |
863a3c6c AA |
419 | { |
420 | return 0; | |
421 | } | |
1775bc34 BH |
422 | |
423 | static inline void nfs4_deviceid_purge_client(struct nfs_client *ncl) | |
424 | { | |
425 | } | |
85e174ba RL |
426 | #endif /* CONFIG_NFS_V4_1 */ |
427 | ||
428 | #endif /* FS_NFS_PNFS_H */ |