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>
22 /* Note: "NI" in comments below means "Not Implemented yet" */
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
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?
33 #define OSD_VER1_SUPPORT y
35 enum osd_std_version {
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.
49 struct scsi_device *scsi_device;
52 #ifdef OSD_VER1_SUPPORT
53 enum osd_std_version version;
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);
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);
66 /* These are called by uld at probe time */
67 void osd_dev_init(struct osd_dev *od, struct scsi_device *scsi_device);
68 void osd_dev_fini(struct osd_dev *od);
70 /* some hi level device operations */
71 int osd_auto_detect_ver(struct osd_dev *od, void *caps); /* GFP_KERNEL */
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)
76 #ifdef OSD_VER1_SUPPORT
82 typedef void (osd_req_done_fn)(struct osd_request *or, void *private);
86 struct osd_data_out_integrity_info out_data_integ;
87 struct osd_data_in_integrity_info in_data_integ;
89 struct osd_dev *osd_dev;
90 struct request *request;
92 struct _osd_req_data_segment {
94 unsigned alloc_size; /* 0 here means: don't call kfree */
96 } set_attr, enc_get_attr, get_attr;
102 struct _osd_req_data_segment *last_seg;
109 u8 sense[OSD_MAX_SENSE_LEN];
110 enum osd_attributes_mode attributes_mode;
112 osd_req_done_fn *async_done;
117 /* OSD Version control */
118 static inline bool osd_req_is_ver1(struct osd_request *or)
120 #ifdef OSD_VER1_SUPPORT
121 return or->osd_dev->version == OSD_VER1;
128 * How to use the osd library:
131 * Allocates a request.
134 * Call one of, to encode the desired operation.
136 * osd_add_{get,set}_attr
137 * Optionally add attributes to the CDB, list or page mode.
139 * osd_finalize_request
140 * Computes final data out/in offsets and signs the request,
141 * making it ready for execution.
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.
148 * osd_req_decode_sense
149 * Decodes sense information to verify execution results.
151 * osd_req_decode_get_attr
152 * Retrieve osd_add_get_attr_list() values if used.
155 * Must be called to deallocate the request.
159 * osd_start_request - Allocate and initialize an osd_request
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
167 * Allocate osd_request and initialize all members to the
168 * default/initial state.
170 struct osd_request *osd_start_request(struct osd_dev *od, gfp_t gfp);
172 enum osd_req_options {
173 OSD_REQ_FUA = 0x08, /* Force Unit Access */
174 OSD_REQ_DPO = 0x10, /* Disable Page Out */
176 OSD_REQ_BYPASS_TIMESTAMPS = 0x80,
180 * osd_finalize_request - Sign request and prepare request for execution
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
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.
193 int osd_finalize_request(struct osd_request *or,
194 u8 options, const void *cap, const u8 *cap_key);
197 * osd_execute_request - Execute the request synchronously through block-layer
199 * @or: osd_request to Executed
201 * Calls blk_execute_rq to q the command and waits for completion.
203 int osd_execute_request(struct osd_request *or);
206 * osd_execute_request_async - Execute the request without waitting.
208 * @or: - osd_request to Executed
209 * @done: (Optional) - Called at end of execution
210 * @private: - Will be passed to @done function
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
216 int osd_execute_request_async(struct osd_request *or,
217 osd_req_done_fn *done, void *private);
220 * osd_req_decode_sense_full - Decode sense information after execution.
222 * @or: - osd_request to examine
223 * @osi - Recievs a more detailed error report information (optional).
224 * @silent - Do not print to dmsg (Even if enabled)
225 * @bad_obj_list - Some commands act on multiple objects. Failed objects will
226 * be recieved here (optional)
227 * @max_obj - Size of @bad_obj_list.
228 * @bad_attr_list - List of failing attributes (optional)
229 * @max_attr - Size of @bad_attr_list.
231 * After execution, sense + return code can be analyzed using this function. The
232 * return code is the final disposition on the error. So it is possible that a
233 * CHECK_CONDITION was returned from target but this will return NO_ERROR, for
234 * example on recovered errors. All parameters are optional if caller does
235 * not need any returned information.
236 * Note: This function will also dump the error to dmsg according to settings
237 * of the SCSI_OSD_DPRINT_SENSE Kconfig value. Set @silent if you know the
238 * command would routinely fail, to not spam the dmsg file.
240 struct osd_sense_info {
241 int key; /* one of enum scsi_sense_keys */
242 int additional_code ; /* enum osd_additional_sense_codes */
243 union { /* Sense specific information */
245 u16 cdb_field_offset; /* scsi_invalid_field_in_cdb */
247 union { /* Command specific information */
251 u32 not_initiated_command_functions; /* osd_command_functions_bits */
252 u32 completed_command_functions; /* osd_command_functions_bits */
253 struct osd_obj_id obj;
254 struct osd_attr attr;
257 int osd_req_decode_sense_full(struct osd_request *or,
258 struct osd_sense_info *osi, bool silent,
259 struct osd_obj_id *bad_obj_list, int max_obj,
260 struct osd_attr *bad_attr_list, int max_attr);
262 static inline int osd_req_decode_sense(struct osd_request *or,
263 struct osd_sense_info *osi)
265 return osd_req_decode_sense_full(or, osi, false, NULL, 0, NULL, 0);
269 * osd_end_request - return osd_request to free store
271 * @or: osd_request to free
273 * Deallocate all osd_request resources (struct req's, BIOs, buffers, etc.)
275 void osd_end_request(struct osd_request *or);
280 * Note: call only one of the following methods.
286 void osd_req_set_master_seed_xchg(struct osd_request *or, ...);/* NI */
287 void osd_req_set_master_key(struct osd_request *or, ...);/* NI */
289 void osd_req_format(struct osd_request *or, u64 tot_capacity);
291 /* list all partitions
292 * @list header must be initialized to zero on first run.
294 * Call osd_is_obj_list_done() to find if we got the complete list.
296 int osd_req_list_dev_partitions(struct osd_request *or,
297 osd_id initial_id, struct osd_obj_id_list *list, unsigned nelem);
299 void osd_req_flush_obsd(struct osd_request *or,
300 enum osd_options_flush_scope_values);
302 void osd_req_perform_scsi_command(struct osd_request *or,
303 const u8 *cdb, ...);/* NI */
304 void osd_req_task_management(struct osd_request *or, ...);/* NI */
309 void osd_req_create_partition(struct osd_request *or, osd_id partition);
310 void osd_req_remove_partition(struct osd_request *or, osd_id partition);
312 void osd_req_set_partition_key(struct osd_request *or,
313 osd_id partition, u8 new_key_id[OSD_CRYPTO_KEYID_SIZE],
314 u8 seed[OSD_CRYPTO_SEED_SIZE]);/* NI */
316 /* list all collections in the partition
317 * @list header must be init to zero on first run.
319 * Call osd_is_obj_list_done() to find if we got the complete list.
321 int osd_req_list_partition_collections(struct osd_request *or,
322 osd_id partition, osd_id initial_id, struct osd_obj_id_list *list,
325 /* list all objects 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_objects(struct osd_request *or,
331 osd_id partition, osd_id initial_id, struct osd_obj_id_list *list,
334 void osd_req_flush_partition(struct osd_request *or,
335 osd_id partition, enum osd_options_flush_scope_values);
338 * Collection commands
340 void osd_req_create_collection(struct osd_request *or,
341 const struct osd_obj_id *);/* NI */
342 void osd_req_remove_collection(struct osd_request *or,
343 const struct osd_obj_id *);/* NI */
345 /* list all objects in the collection */
346 int osd_req_list_collection_objects(struct osd_request *or,
347 const struct osd_obj_id *, osd_id initial_id,
348 struct osd_obj_id_list *list, unsigned nelem);
350 /* V2 only filtered list of objects in the collection */
351 void osd_req_query(struct osd_request *or, ...);/* NI */
353 void osd_req_flush_collection(struct osd_request *or,
354 const struct osd_obj_id *, enum osd_options_flush_scope_values);
356 void osd_req_get_member_attrs(struct osd_request *or, ...);/* V2-only NI */
357 void osd_req_set_member_attrs(struct osd_request *or, ...);/* V2-only NI */
362 void osd_req_create_object(struct osd_request *or, struct osd_obj_id *);
363 void osd_req_remove_object(struct osd_request *or, struct osd_obj_id *);
365 void osd_req_write(struct osd_request *or,
366 const struct osd_obj_id *, struct bio *data_out, u64 offset);
367 void osd_req_append(struct osd_request *or,
368 const struct osd_obj_id *, struct bio *data_out);/* NI */
369 void osd_req_create_write(struct osd_request *or,
370 const struct osd_obj_id *, struct bio *data_out, u64 offset);/* NI */
371 void osd_req_clear(struct osd_request *or,
372 const struct osd_obj_id *, u64 offset, u64 len);/* NI */
373 void osd_req_punch(struct osd_request *or,
374 const struct osd_obj_id *, u64 offset, u64 len);/* V2-only NI */
376 void osd_req_flush_object(struct osd_request *or,
377 const struct osd_obj_id *, enum osd_options_flush_scope_values,
378 /*V2*/ u64 offset, /*V2*/ u64 len);
380 void osd_req_read(struct osd_request *or,
381 const struct osd_obj_id *, struct bio *data_in, u64 offset);
384 * Root/Partition/Collection/Object Attributes commands
388 void osd_req_get_attributes(struct osd_request *or, const struct osd_obj_id *);
391 void osd_req_set_attributes(struct osd_request *or, const struct osd_obj_id *);
394 * Attributes appended to most commands
397 /* Attributes List mode (or V2 CDB) */
399 * TODO: In ver2 if at finalize time only one attr was set and no gets,
400 * then the Attributes CDB mode is used automatically to save IO.
403 /* set a list of attributes. */
404 int osd_req_add_set_attr_list(struct osd_request *or,
405 const struct osd_attr *, unsigned nelem);
407 /* get a list of attributes */
408 int osd_req_add_get_attr_list(struct osd_request *or,
409 const struct osd_attr *, unsigned nelem);
412 * Attributes list decoding
413 * Must be called after osd_request.request was executed
414 * It is called in a loop to decode the returned get_attr
415 * (see osd_add_get_attr)
417 int osd_req_decode_get_attr_list(struct osd_request *or,
418 struct osd_attr *, int *nelem, void **iterator);
420 /* Attributes Page mode */
423 * Read an attribute page and optionally set one attribute
425 * Retrieves the attribute page directly to a user buffer.
426 * @attr_page_data shall stay valid until end of execution.
427 * See osd_attributes.h for common page structures
429 int osd_req_add_get_attr_page(struct osd_request *or,
430 u32 page_id, void *attr_page_data, unsigned max_page_len,
431 const struct osd_attr *set_one);
433 #endif /* __OSD_LIB_H__ */