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de258bf5 BH |
1 | /* |
2 | * osd_initiator.h - OSD initiator API definition | |
3 | * | |
4 | * Copyright (C) 2008 Panasas Inc. All rights reserved. | |
5 | * | |
6 | * Authors: | |
7 | * Boaz Harrosh <bharrosh@panasas.com> | |
8 | * Benny Halevy <bhalevy@panasas.com> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License version 2 | |
12 | * | |
13 | */ | |
14 | #ifndef __OSD_INITIATOR_H__ | |
15 | #define __OSD_INITIATOR_H__ | |
16 | ||
17 | #include "osd_protocol.h" | |
18 | #include "osd_types.h" | |
19 | ||
20 | #include <linux/blkdev.h> | |
21 | ||
22 | /* Note: "NI" in comments below means "Not Implemented yet" */ | |
23 | ||
c6572c98 BH |
24 | /* Configure of code: |
25 | * #undef if you *don't* want OSD v1 support in runtime. | |
26 | * If #defined the initiator will dynamically configure to encode OSD v1 | |
27 | * CDB's if the target is detected to be OSD v1 only. | |
28 | * OSD v2 only commands, options, and attributes will be ignored if target | |
29 | * is v1 only. | |
30 | * If #defined will result in bigger/slower code (OK Slower maybe not) | |
31 | * Q: Should this be CONFIG_SCSI_OSD_VER1_SUPPORT and set from Kconfig? | |
32 | */ | |
33 | #define OSD_VER1_SUPPORT y | |
34 | ||
35 | enum osd_std_version { | |
36 | OSD_VER_NONE = 0, | |
37 | OSD_VER1 = 1, | |
38 | OSD_VER2 = 2, | |
39 | }; | |
40 | ||
de258bf5 BH |
41 | /* |
42 | * Object-based Storage Device. | |
43 | * This object represents an OSD device. | |
44 | * It is not a full linux device in any way. It is only | |
45 | * a place to hang resources associated with a Linux | |
46 | * request Q and some default properties. | |
47 | */ | |
48 | struct osd_dev { | |
49 | struct scsi_device *scsi_device; | |
50 | unsigned def_timeout; | |
c6572c98 BH |
51 | |
52 | #ifdef OSD_VER1_SUPPORT | |
53 | enum osd_std_version version; | |
54 | #endif | |
de258bf5 BH |
55 | }; |
56 | ||
b799bc7d BH |
57 | /* Retrieve/return osd_dev(s) for use by Kernel clients */ |
58 | struct osd_dev *osduld_path_lookup(const char *dev_name); /*Use IS_ERR/ERR_PTR*/ | |
59 | void osduld_put_device(struct osd_dev *od); | |
60 | ||
95b05a7d BH |
61 | /* Add/remove test ioctls from external modules */ |
62 | typedef int (do_test_fn)(struct osd_dev *od, unsigned cmd, unsigned long arg); | |
63 | int osduld_register_test(unsigned ioctl, do_test_fn *do_test); | |
64 | void osduld_unregister_test(unsigned ioctl); | |
65 | ||
66 | /* These are called by uld at probe time */ | |
de258bf5 BH |
67 | void osd_dev_init(struct osd_dev *od, struct scsi_device *scsi_device); |
68 | void osd_dev_fini(struct osd_dev *od); | |
69 | ||
1b9dce94 BH |
70 | /* some hi level device operations */ |
71 | int osd_auto_detect_ver(struct osd_dev *od, void *caps); /* GFP_KERNEL */ | |
72 | ||
c6572c98 BH |
73 | /* we might want to use function vector in the future */ |
74 | static inline void osd_dev_set_ver(struct osd_dev *od, enum osd_std_version v) | |
75 | { | |
76 | #ifdef OSD_VER1_SUPPORT | |
77 | od->version = v; | |
78 | #endif | |
79 | } | |
80 | ||
de258bf5 BH |
81 | struct osd_request; |
82 | typedef void (osd_req_done_fn)(struct osd_request *or, void *private); | |
83 | ||
84 | struct osd_request { | |
85 | struct osd_cdb cdb; | |
86 | struct osd_data_out_integrity_info out_data_integ; | |
87 | struct osd_data_in_integrity_info in_data_integ; | |
88 | ||
89 | struct osd_dev *osd_dev; | |
90 | struct request *request; | |
91 | ||
92 | struct _osd_req_data_segment { | |
93 | void *buff; | |
94 | unsigned alloc_size; /* 0 here means: don't call kfree */ | |
95 | unsigned total_bytes; | |
96 | } set_attr, enc_get_attr, get_attr; | |
97 | ||
98 | struct _osd_io_info { | |
99 | struct bio *bio; | |
100 | u64 total_bytes; | |
101 | struct request *req; | |
102 | struct _osd_req_data_segment *last_seg; | |
103 | u8 *pad_buff; | |
104 | } out, in; | |
105 | ||
106 | gfp_t alloc_flags; | |
107 | unsigned timeout; | |
108 | unsigned retries; | |
109 | u8 sense[OSD_MAX_SENSE_LEN]; | |
110 | enum osd_attributes_mode attributes_mode; | |
111 | ||
112 | osd_req_done_fn *async_done; | |
113 | void *async_private; | |
114 | int async_error; | |
115 | }; | |
116 | ||
c6572c98 BH |
117 | /* OSD Version control */ |
118 | static inline bool osd_req_is_ver1(struct osd_request *or) | |
119 | { | |
120 | #ifdef OSD_VER1_SUPPORT | |
121 | return or->osd_dev->version == OSD_VER1; | |
122 | #else | |
123 | return false; | |
124 | #endif | |
125 | } | |
126 | ||
de258bf5 BH |
127 | /* |
128 | * How to use the osd library: | |
129 | * | |
130 | * osd_start_request | |
131 | * Allocates a request. | |
132 | * | |
133 | * osd_req_* | |
134 | * Call one of, to encode the desired operation. | |
135 | * | |
136 | * osd_add_{get,set}_attr | |
137 | * Optionally add attributes to the CDB, list or page mode. | |
138 | * | |
139 | * osd_finalize_request | |
140 | * Computes final data out/in offsets and signs the request, | |
141 | * making it ready for execution. | |
142 | * | |
143 | * osd_execute_request | |
144 | * May be called to execute it through the block layer. Other wise submit | |
145 | * the associated block request in some other way. | |
146 | * | |
147 | * After execution: | |
148 | * osd_req_decode_sense | |
149 | * Decodes sense information to verify execution results. | |
150 | * | |
151 | * osd_req_decode_get_attr | |
152 | * Retrieve osd_add_get_attr_list() values if used. | |
153 | * | |
154 | * osd_end_request | |
155 | * Must be called to deallocate the request. | |
156 | */ | |
157 | ||
158 | /** | |
159 | * osd_start_request - Allocate and initialize an osd_request | |
160 | * | |
161 | * @osd_dev: OSD device that holds the scsi-device and default values | |
162 | * that the request is associated with. | |
163 | * @gfp: The allocation flags to use for request allocation, and all | |
164 | * subsequent allocations. This will be stored at | |
165 | * osd_request->alloc_flags, can be changed by user later | |
166 | * | |
167 | * Allocate osd_request and initialize all members to the | |
168 | * default/initial state. | |
169 | */ | |
170 | struct osd_request *osd_start_request(struct osd_dev *od, gfp_t gfp); | |
171 | ||
172 | enum osd_req_options { | |
173 | OSD_REQ_FUA = 0x08, /* Force Unit Access */ | |
174 | OSD_REQ_DPO = 0x10, /* Disable Page Out */ | |
175 | ||
176 | OSD_REQ_BYPASS_TIMESTAMPS = 0x80, | |
177 | }; | |
178 | ||
179 | /** | |
180 | * osd_finalize_request - Sign request and prepare request for execution | |
181 | * | |
182 | * @or: osd_request to prepare | |
183 | * @options: combination of osd_req_options bit flags or 0. | |
184 | * @cap: A Pointer to an OSD_CAP_LEN bytes buffer that is received from | |
185 | * The security manager as capabilities for this cdb. | |
186 | * @cap_key: The cryptographic key used to sign the cdb/data. Can be null | |
187 | * if NOSEC is used. | |
188 | * | |
189 | * The actual request and bios are only allocated here, so are the get_attr | |
190 | * buffers that will receive the returned attributes. Copy's @cap to cdb. | |
191 | * Sign the cdb/data with @cap_key. | |
192 | */ | |
193 | int osd_finalize_request(struct osd_request *or, | |
194 | u8 options, const void *cap, const u8 *cap_key); | |
195 | ||
196 | /** | |
197 | * osd_execute_request - Execute the request synchronously through block-layer | |
198 | * | |
199 | * @or: osd_request to Executed | |
200 | * | |
201 | * Calls blk_execute_rq to q the command and waits for completion. | |
202 | */ | |
203 | int osd_execute_request(struct osd_request *or); | |
204 | ||
205 | /** | |
206 | * osd_execute_request_async - Execute the request without waitting. | |
207 | * | |
208 | * @or: - osd_request to Executed | |
209 | * @done: (Optional) - Called at end of execution | |
210 | * @private: - Will be passed to @done function | |
211 | * | |
212 | * Calls blk_execute_rq_nowait to queue the command. When execution is done | |
213 | * optionally calls @done with @private as parameter. @or->async_error will | |
214 | * have the return code | |
215 | */ | |
216 | int osd_execute_request_async(struct osd_request *or, | |
217 | osd_req_done_fn *done, void *private); | |
218 | ||
219 | /** | |
220 | * osd_end_request - return osd_request to free store | |
221 | * | |
222 | * @or: osd_request to free | |
223 | * | |
224 | * Deallocate all osd_request resources (struct req's, BIOs, buffers, etc.) | |
225 | */ | |
226 | void osd_end_request(struct osd_request *or); | |
227 | ||
228 | /* | |
229 | * CDB Encoding | |
230 | * | |
231 | * Note: call only one of the following methods. | |
232 | */ | |
233 | ||
234 | /* | |
235 | * Device commands | |
236 | */ | |
237 | void osd_req_set_master_seed_xchg(struct osd_request *or, ...);/* NI */ | |
238 | void osd_req_set_master_key(struct osd_request *or, ...);/* NI */ | |
239 | ||
240 | void osd_req_format(struct osd_request *or, u64 tot_capacity); | |
241 | ||
242 | /* list all partitions | |
243 | * @list header must be initialized to zero on first run. | |
244 | * | |
245 | * Call osd_is_obj_list_done() to find if we got the complete list. | |
246 | */ | |
247 | int osd_req_list_dev_partitions(struct osd_request *or, | |
248 | osd_id initial_id, struct osd_obj_id_list *list, unsigned nelem); | |
249 | ||
250 | void osd_req_flush_obsd(struct osd_request *or, | |
251 | enum osd_options_flush_scope_values); | |
252 | ||
253 | void osd_req_perform_scsi_command(struct osd_request *or, | |
254 | const u8 *cdb, ...);/* NI */ | |
255 | void osd_req_task_management(struct osd_request *or, ...);/* NI */ | |
256 | ||
257 | /* | |
258 | * Partition commands | |
259 | */ | |
260 | void osd_req_create_partition(struct osd_request *or, osd_id partition); | |
261 | void osd_req_remove_partition(struct osd_request *or, osd_id partition); | |
262 | ||
263 | void osd_req_set_partition_key(struct osd_request *or, | |
264 | osd_id partition, u8 new_key_id[OSD_CRYPTO_KEYID_SIZE], | |
265 | u8 seed[OSD_CRYPTO_SEED_SIZE]);/* NI */ | |
266 | ||
267 | /* list all collections in the partition | |
268 | * @list header must be init to zero on first run. | |
269 | * | |
270 | * Call osd_is_obj_list_done() to find if we got the complete list. | |
271 | */ | |
272 | int osd_req_list_partition_collections(struct osd_request *or, | |
273 | osd_id partition, osd_id initial_id, struct osd_obj_id_list *list, | |
274 | unsigned nelem); | |
275 | ||
276 | /* list all objects in the partition | |
277 | * @list header must be init to zero on first run. | |
278 | * | |
279 | * Call osd_is_obj_list_done() to find if we got the complete list. | |
280 | */ | |
281 | int osd_req_list_partition_objects(struct osd_request *or, | |
282 | osd_id partition, osd_id initial_id, struct osd_obj_id_list *list, | |
283 | unsigned nelem); | |
284 | ||
285 | void osd_req_flush_partition(struct osd_request *or, | |
286 | osd_id partition, enum osd_options_flush_scope_values); | |
287 | ||
288 | /* | |
289 | * Collection commands | |
290 | */ | |
291 | void osd_req_create_collection(struct osd_request *or, | |
292 | const struct osd_obj_id *);/* NI */ | |
293 | void osd_req_remove_collection(struct osd_request *or, | |
294 | const struct osd_obj_id *);/* NI */ | |
295 | ||
296 | /* list all objects in the collection */ | |
297 | int osd_req_list_collection_objects(struct osd_request *or, | |
298 | const struct osd_obj_id *, osd_id initial_id, | |
299 | struct osd_obj_id_list *list, unsigned nelem); | |
300 | ||
301 | /* V2 only filtered list of objects in the collection */ | |
302 | void osd_req_query(struct osd_request *or, ...);/* NI */ | |
303 | ||
304 | void osd_req_flush_collection(struct osd_request *or, | |
305 | const struct osd_obj_id *, enum osd_options_flush_scope_values); | |
306 | ||
307 | void osd_req_get_member_attrs(struct osd_request *or, ...);/* V2-only NI */ | |
308 | void osd_req_set_member_attrs(struct osd_request *or, ...);/* V2-only NI */ | |
309 | ||
310 | /* | |
311 | * Object commands | |
312 | */ | |
313 | void osd_req_create_object(struct osd_request *or, struct osd_obj_id *); | |
314 | void osd_req_remove_object(struct osd_request *or, struct osd_obj_id *); | |
315 | ||
316 | void osd_req_write(struct osd_request *or, | |
317 | const struct osd_obj_id *, struct bio *data_out, u64 offset); | |
318 | void osd_req_append(struct osd_request *or, | |
319 | const struct osd_obj_id *, struct bio *data_out);/* NI */ | |
320 | void osd_req_create_write(struct osd_request *or, | |
321 | const struct osd_obj_id *, struct bio *data_out, u64 offset);/* NI */ | |
322 | void osd_req_clear(struct osd_request *or, | |
323 | const struct osd_obj_id *, u64 offset, u64 len);/* NI */ | |
324 | void osd_req_punch(struct osd_request *or, | |
325 | const struct osd_obj_id *, u64 offset, u64 len);/* V2-only NI */ | |
326 | ||
327 | void osd_req_flush_object(struct osd_request *or, | |
328 | const struct osd_obj_id *, enum osd_options_flush_scope_values, | |
329 | /*V2*/ u64 offset, /*V2*/ u64 len); | |
330 | ||
331 | void osd_req_read(struct osd_request *or, | |
332 | const struct osd_obj_id *, struct bio *data_in, u64 offset); | |
333 | ||
334 | /* | |
335 | * Root/Partition/Collection/Object Attributes commands | |
336 | */ | |
337 | ||
338 | /* get before set */ | |
339 | void osd_req_get_attributes(struct osd_request *or, const struct osd_obj_id *); | |
340 | ||
341 | /* set before get */ | |
342 | void osd_req_set_attributes(struct osd_request *or, const struct osd_obj_id *); | |
343 | ||
344 | /* | |
345 | * Attributes appended to most commands | |
346 | */ | |
347 | ||
348 | /* Attributes List mode (or V2 CDB) */ | |
349 | /* | |
350 | * TODO: In ver2 if at finalize time only one attr was set and no gets, | |
351 | * then the Attributes CDB mode is used automatically to save IO. | |
352 | */ | |
353 | ||
354 | /* set a list of attributes. */ | |
355 | int osd_req_add_set_attr_list(struct osd_request *or, | |
356 | const struct osd_attr *, unsigned nelem); | |
357 | ||
358 | /* get a list of attributes */ | |
359 | int osd_req_add_get_attr_list(struct osd_request *or, | |
360 | const struct osd_attr *, unsigned nelem); | |
361 | ||
362 | /* | |
363 | * Attributes list decoding | |
364 | * Must be called after osd_request.request was executed | |
365 | * It is called in a loop to decode the returned get_attr | |
366 | * (see osd_add_get_attr) | |
367 | */ | |
368 | int osd_req_decode_get_attr_list(struct osd_request *or, | |
369 | struct osd_attr *, int *nelem, void **iterator); | |
370 | ||
371 | /* Attributes Page mode */ | |
372 | ||
373 | /* | |
374 | * Read an attribute page and optionally set one attribute | |
375 | * | |
376 | * Retrieves the attribute page directly to a user buffer. | |
377 | * @attr_page_data shall stay valid until end of execution. | |
378 | * See osd_attributes.h for common page structures | |
379 | */ | |
380 | int osd_req_add_get_attr_page(struct osd_request *or, | |
381 | u32 page_id, void *attr_page_data, unsigned max_page_len, | |
382 | const struct osd_attr *set_one); | |
383 | ||
384 | #endif /* __OSD_LIB_H__ */ |