2 * osd_initiator.h - OSD initiator API definition
4 * Copyright (C) 2008 Panasas Inc. All rights reserved.
7 * Boaz Harrosh <bharrosh@panasas.com>
8 * Benny Halevy <bhalevy@panasas.com>
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
14 #ifndef __OSD_INITIATOR_H__
15 #define __OSD_INITIATOR_H__
17 #include "osd_protocol.h"
18 #include "osd_types.h"
20 #include <linux/blkdev.h>
21 #include <scsi/scsi_device.h>
23 /* Note: "NI" in comments below means "Not Implemented yet" */
26 * #undef if you *don't* want OSD v1 support in runtime.
27 * If #defined the initiator will dynamically configure to encode OSD v1
28 * CDB's if the target is detected to be OSD v1 only.
29 * OSD v2 only commands, options, and attributes will be ignored if target
31 * If #defined will result in bigger/slower code (OK Slower maybe not)
32 * Q: Should this be CONFIG_SCSI_OSD_VER1_SUPPORT and set from Kconfig?
34 #define OSD_VER1_SUPPORT y
36 enum osd_std_version {
43 * Object-based Storage Device.
44 * This object represents an OSD device.
45 * It is not a full linux device in any way. It is only
46 * a place to hang resources associated with a Linux
47 * request Q and some default properties.
50 struct scsi_device *scsi_device;
53 #ifdef OSD_VER1_SUPPORT
54 enum osd_std_version version;
58 /* Retrieve/return osd_dev(s) for use by Kernel clients */
59 struct osd_dev *osduld_path_lookup(const char *dev_name); /*Use IS_ERR/ERR_PTR*/
60 void osduld_put_device(struct osd_dev *od);
62 /* Add/remove test ioctls from external modules */
63 typedef int (do_test_fn)(struct osd_dev *od, unsigned cmd, unsigned long arg);
64 int osduld_register_test(unsigned ioctl, do_test_fn *do_test);
65 void osduld_unregister_test(unsigned ioctl);
67 /* These are called by uld at probe time */
68 void osd_dev_init(struct osd_dev *od, struct scsi_device *scsi_device);
69 void osd_dev_fini(struct osd_dev *od);
71 /* some hi level device operations */
72 int osd_auto_detect_ver(struct osd_dev *od, void *caps); /* GFP_KERNEL */
73 static inline struct request_queue *osd_request_queue(struct osd_dev *od)
75 return od->scsi_device->request_queue;
78 /* we might want to use function vector in the future */
79 static inline void osd_dev_set_ver(struct osd_dev *od, enum osd_std_version v)
81 #ifdef OSD_VER1_SUPPORT
86 static inline bool osd_dev_is_ver1(struct osd_dev *od)
88 #ifdef OSD_VER1_SUPPORT
89 return od->version == OSD_VER1;
96 typedef void (osd_req_done_fn)(struct osd_request *or, void *private);
100 struct osd_data_out_integrity_info out_data_integ;
101 struct osd_data_in_integrity_info in_data_integ;
103 struct osd_dev *osd_dev;
104 struct request *request;
106 struct _osd_req_data_segment {
108 unsigned alloc_size; /* 0 here means: don't call kfree */
109 unsigned total_bytes;
110 } set_attr, enc_get_attr, get_attr;
112 struct _osd_io_info {
116 struct _osd_req_data_segment *last_seg;
123 u8 sense[OSD_MAX_SENSE_LEN];
124 enum osd_attributes_mode attributes_mode;
126 osd_req_done_fn *async_done;
131 static inline bool osd_req_is_ver1(struct osd_request *or)
133 return osd_dev_is_ver1(or->osd_dev);
137 * How to use the osd library:
140 * Allocates a request.
143 * Call one of, to encode the desired operation.
145 * osd_add_{get,set}_attr
146 * Optionally add attributes to the CDB, list or page mode.
148 * osd_finalize_request
149 * Computes final data out/in offsets and signs the request,
150 * making it ready for execution.
152 * osd_execute_request
153 * May be called to execute it through the block layer. Other wise submit
154 * the associated block request in some other way.
157 * osd_req_decode_sense
158 * Decodes sense information to verify execution results.
160 * osd_req_decode_get_attr
161 * Retrieve osd_add_get_attr_list() values if used.
164 * Must be called to deallocate the request.
168 * osd_start_request - Allocate and initialize an osd_request
170 * @osd_dev: OSD device that holds the scsi-device and default values
171 * that the request is associated with.
172 * @gfp: The allocation flags to use for request allocation, and all
173 * subsequent allocations. This will be stored at
174 * osd_request->alloc_flags, can be changed by user later
176 * Allocate osd_request and initialize all members to the
177 * default/initial state.
179 struct osd_request *osd_start_request(struct osd_dev *od, gfp_t gfp);
181 enum osd_req_options {
182 OSD_REQ_FUA = 0x08, /* Force Unit Access */
183 OSD_REQ_DPO = 0x10, /* Disable Page Out */
185 OSD_REQ_BYPASS_TIMESTAMPS = 0x80,
189 * osd_finalize_request - Sign request and prepare request for execution
191 * @or: osd_request to prepare
192 * @options: combination of osd_req_options bit flags or 0.
193 * @cap: A Pointer to an OSD_CAP_LEN bytes buffer that is received from
194 * The security manager as capabilities for this cdb.
195 * @cap_key: The cryptographic key used to sign the cdb/data. Can be null
198 * The actual request and bios are only allocated here, so are the get_attr
199 * buffers that will receive the returned attributes. Copy's @cap to cdb.
200 * Sign the cdb/data with @cap_key.
202 int osd_finalize_request(struct osd_request *or,
203 u8 options, const void *cap, const u8 *cap_key);
206 * osd_execute_request - Execute the request synchronously through block-layer
208 * @or: osd_request to Executed
210 * Calls blk_execute_rq to q the command and waits for completion.
212 int osd_execute_request(struct osd_request *or);
215 * osd_execute_request_async - Execute the request without waitting.
217 * @or: - osd_request to Executed
218 * @done: (Optional) - Called at end of execution
219 * @private: - Will be passed to @done function
221 * Calls blk_execute_rq_nowait to queue the command. When execution is done
222 * optionally calls @done with @private as parameter. @or->async_error will
223 * have the return code
225 int osd_execute_request_async(struct osd_request *or,
226 osd_req_done_fn *done, void *private);
229 * osd_req_decode_sense_full - Decode sense information after execution.
231 * @or: - osd_request to examine
232 * @osi - Recievs a more detailed error report information (optional).
233 * @silent - Do not print to dmsg (Even if enabled)
234 * @bad_obj_list - Some commands act on multiple objects. Failed objects will
235 * be recieved here (optional)
236 * @max_obj - Size of @bad_obj_list.
237 * @bad_attr_list - List of failing attributes (optional)
238 * @max_attr - Size of @bad_attr_list.
240 * After execution, sense + return code can be analyzed using this function. The
241 * return code is the final disposition on the error. So it is possible that a
242 * CHECK_CONDITION was returned from target but this will return NO_ERROR, for
243 * example on recovered errors. All parameters are optional if caller does
244 * not need any returned information.
245 * Note: This function will also dump the error to dmsg according to settings
246 * of the SCSI_OSD_DPRINT_SENSE Kconfig value. Set @silent if you know the
247 * command would routinely fail, to not spam the dmsg file.
249 struct osd_sense_info {
250 int key; /* one of enum scsi_sense_keys */
251 int additional_code ; /* enum osd_additional_sense_codes */
252 union { /* Sense specific information */
254 u16 cdb_field_offset; /* scsi_invalid_field_in_cdb */
256 union { /* Command specific information */
260 u32 not_initiated_command_functions; /* osd_command_functions_bits */
261 u32 completed_command_functions; /* osd_command_functions_bits */
262 struct osd_obj_id obj;
263 struct osd_attr attr;
266 int osd_req_decode_sense_full(struct osd_request *or,
267 struct osd_sense_info *osi, bool silent,
268 struct osd_obj_id *bad_obj_list, int max_obj,
269 struct osd_attr *bad_attr_list, int max_attr);
271 static inline int osd_req_decode_sense(struct osd_request *or,
272 struct osd_sense_info *osi)
274 return osd_req_decode_sense_full(or, osi, false, NULL, 0, NULL, 0);
278 * osd_end_request - return osd_request to free store
280 * @or: osd_request to free
282 * Deallocate all osd_request resources (struct req's, BIOs, buffers, etc.)
284 void osd_end_request(struct osd_request *or);
289 * Note: call only one of the following methods.
295 void osd_req_set_master_seed_xchg(struct osd_request *or, ...);/* NI */
296 void osd_req_set_master_key(struct osd_request *or, ...);/* NI */
298 void osd_req_format(struct osd_request *or, u64 tot_capacity);
300 /* list all partitions
301 * @list header must be initialized to zero on first run.
303 * Call osd_is_obj_list_done() to find if we got the complete list.
305 int osd_req_list_dev_partitions(struct osd_request *or,
306 osd_id initial_id, struct osd_obj_id_list *list, unsigned nelem);
308 void osd_req_flush_obsd(struct osd_request *or,
309 enum osd_options_flush_scope_values);
311 void osd_req_perform_scsi_command(struct osd_request *or,
312 const u8 *cdb, ...);/* NI */
313 void osd_req_task_management(struct osd_request *or, ...);/* NI */
318 void osd_req_create_partition(struct osd_request *or, osd_id partition);
319 void osd_req_remove_partition(struct osd_request *or, osd_id partition);
321 void osd_req_set_partition_key(struct osd_request *or,
322 osd_id partition, u8 new_key_id[OSD_CRYPTO_KEYID_SIZE],
323 u8 seed[OSD_CRYPTO_SEED_SIZE]);/* NI */
325 /* list all collections in the partition
326 * @list header must be init to zero on first run.
328 * Call osd_is_obj_list_done() to find if we got the complete list.
330 int osd_req_list_partition_collections(struct osd_request *or,
331 osd_id partition, osd_id initial_id, struct osd_obj_id_list *list,
334 /* list all objects in the partition
335 * @list header must be init to zero on first run.
337 * Call osd_is_obj_list_done() to find if we got the complete list.
339 int osd_req_list_partition_objects(struct osd_request *or,
340 osd_id partition, osd_id initial_id, struct osd_obj_id_list *list,
343 void osd_req_flush_partition(struct osd_request *or,
344 osd_id partition, enum osd_options_flush_scope_values);
347 * Collection commands
349 void osd_req_create_collection(struct osd_request *or,
350 const struct osd_obj_id *);/* NI */
351 void osd_req_remove_collection(struct osd_request *or,
352 const struct osd_obj_id *);/* NI */
354 /* list all objects in the collection */
355 int osd_req_list_collection_objects(struct osd_request *or,
356 const struct osd_obj_id *, osd_id initial_id,
357 struct osd_obj_id_list *list, unsigned nelem);
359 /* V2 only filtered list of objects in the collection */
360 void osd_req_query(struct osd_request *or, ...);/* NI */
362 void osd_req_flush_collection(struct osd_request *or,
363 const struct osd_obj_id *, enum osd_options_flush_scope_values);
365 void osd_req_get_member_attrs(struct osd_request *or, ...);/* V2-only NI */
366 void osd_req_set_member_attrs(struct osd_request *or, ...);/* V2-only NI */
371 void osd_req_create_object(struct osd_request *or, struct osd_obj_id *);
372 void osd_req_remove_object(struct osd_request *or, struct osd_obj_id *);
374 void osd_req_write(struct osd_request *or,
375 const struct osd_obj_id *obj, u64 offset, struct bio *bio, u64 len);
376 int osd_req_write_kern(struct osd_request *or,
377 const struct osd_obj_id *obj, u64 offset, void *buff, u64 len);
378 void osd_req_append(struct osd_request *or,
379 const struct osd_obj_id *, struct bio *data_out);/* NI */
380 void osd_req_create_write(struct osd_request *or,
381 const struct osd_obj_id *, struct bio *data_out, u64 offset);/* NI */
382 void osd_req_clear(struct osd_request *or,
383 const struct osd_obj_id *, u64 offset, u64 len);/* NI */
384 void osd_req_punch(struct osd_request *or,
385 const struct osd_obj_id *, u64 offset, u64 len);/* V2-only NI */
387 void osd_req_flush_object(struct osd_request *or,
388 const struct osd_obj_id *, enum osd_options_flush_scope_values,
389 /*V2*/ u64 offset, /*V2*/ u64 len);
391 void osd_req_read(struct osd_request *or,
392 const struct osd_obj_id *obj, u64 offset, struct bio *bio, u64 len);
393 int osd_req_read_kern(struct osd_request *or,
394 const struct osd_obj_id *obj, u64 offset, void *buff, u64 len);
397 * Root/Partition/Collection/Object Attributes commands
401 void osd_req_get_attributes(struct osd_request *or, const struct osd_obj_id *);
404 void osd_req_set_attributes(struct osd_request *or, const struct osd_obj_id *);
407 * Attributes appended to most commands
410 /* Attributes List mode (or V2 CDB) */
412 * TODO: In ver2 if at finalize time only one attr was set and no gets,
413 * then the Attributes CDB mode is used automatically to save IO.
416 /* set a list of attributes. */
417 int osd_req_add_set_attr_list(struct osd_request *or,
418 const struct osd_attr *, unsigned nelem);
420 /* get a list of attributes */
421 int osd_req_add_get_attr_list(struct osd_request *or,
422 const struct osd_attr *, unsigned nelem);
425 * Attributes list decoding
426 * Must be called after osd_request.request was executed
427 * It is called in a loop to decode the returned get_attr
428 * (see osd_add_get_attr)
430 int osd_req_decode_get_attr_list(struct osd_request *or,
431 struct osd_attr *, int *nelem, void **iterator);
433 /* Attributes Page mode */
436 * Read an attribute page and optionally set one attribute
438 * Retrieves the attribute page directly to a user buffer.
439 * @attr_page_data shall stay valid until end of execution.
440 * See osd_attributes.h for common page structures
442 int osd_req_add_get_attr_page(struct osd_request *or,
443 u32 page_id, void *attr_page_data, unsigned max_page_len,
444 const struct osd_attr *set_one);
446 #endif /* __OSD_LIB_H__ */