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TOMOYO Linux Cross Reference
Linux/include/scsi/osd_initiator.h

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  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 <ooo@electrozaur.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 <scsi/osd_protocol.h>
 18 #include <scsi/osd_types.h>
 19 
 20 #include <linux/blkdev.h>
 21 #include <scsi/scsi_device.h>
 22 
 23 /* Note: "NI" in comments below means "Not Implemented yet" */
 24 
 25 /* Configure of code:
 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
 30  * is v1 only.
 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?
 33  */
 34 #define OSD_VER1_SUPPORT y
 35 
 36 enum osd_std_version {
 37         OSD_VER_NONE = 0,
 38         OSD_VER1 = 1,
 39         OSD_VER2 = 2,
 40 };
 41 
 42 /*
 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.
 48  */
 49 struct osd_dev {
 50         struct scsi_device *scsi_device;
 51         unsigned def_timeout;
 52 
 53 #ifdef OSD_VER1_SUPPORT
 54         enum osd_std_version version;
 55 #endif
 56 };
 57 
 58 /* Unique Identification of an OSD device */
 59 struct osd_dev_info {
 60         unsigned systemid_len;
 61         u8 systemid[OSD_SYSTEMID_LEN];
 62         unsigned osdname_len;
 63         u8 *osdname;
 64 };
 65 
 66 /* Retrieve/return osd_dev(s) for use by Kernel clients
 67  * Use IS_ERR/ERR_PTR on returned "osd_dev *".
 68  */
 69 struct osd_dev *osduld_path_lookup(const char *dev_name);
 70 struct osd_dev *osduld_info_lookup(const struct osd_dev_info *odi);
 71 void osduld_put_device(struct osd_dev *od);
 72 
 73 const struct osd_dev_info *osduld_device_info(struct osd_dev *od);
 74 bool osduld_device_same(struct osd_dev *od, const struct osd_dev_info *odi);
 75 
 76 /* Add/remove test ioctls from external modules */
 77 typedef int (do_test_fn)(struct osd_dev *od, unsigned cmd, unsigned long arg);
 78 int osduld_register_test(unsigned ioctl, do_test_fn *do_test);
 79 void osduld_unregister_test(unsigned ioctl);
 80 
 81 /* These are called by uld at probe time */
 82 void osd_dev_init(struct osd_dev *od, struct scsi_device *scsi_device);
 83 void osd_dev_fini(struct osd_dev *od);
 84 
 85 /**
 86  * osd_auto_detect_ver - Detect the OSD version, return Unique Identification
 87  *
 88  * @od:     OSD target lun handle
 89  * @caps:   Capabilities authorizing OSD root read attributes access
 90  * @odi:    Retrieved information uniquely identifying the osd target lun
 91  *          Note: odi->osdname must be kfreed by caller.
 92  *
 93  * Auto detects the OSD version of the OSD target and sets the @od
 94  * accordingly. Meanwhile also returns the "system id" and "osd name" root
 95  * attributes which uniquely identify the OSD target. This member is usually
 96  * called by the ULD. ULD users should call osduld_device_info().
 97  * This rutine allocates osd requests and memory at GFP_KERNEL level and might
 98  * sleep.
 99  */
100 int osd_auto_detect_ver(struct osd_dev *od,
101         void *caps, struct osd_dev_info *odi);
102 
103 static inline struct request_queue *osd_request_queue(struct osd_dev *od)
104 {
105         return od->scsi_device->request_queue;
106 }
107 
108 /* we might want to use function vector in the future */
109 static inline void osd_dev_set_ver(struct osd_dev *od, enum osd_std_version v)
110 {
111 #ifdef OSD_VER1_SUPPORT
112         od->version = v;
113 #endif
114 }
115 
116 static inline bool osd_dev_is_ver1(struct osd_dev *od)
117 {
118 #ifdef OSD_VER1_SUPPORT
119         return od->version == OSD_VER1;
120 #else
121         return false;
122 #endif
123 }
124 
125 struct osd_request;
126 typedef void (osd_req_done_fn)(struct osd_request *or, void *private);
127 
128 struct osd_request {
129         struct osd_cdb cdb;
130         struct osd_data_out_integrity_info out_data_integ;
131         struct osd_data_in_integrity_info in_data_integ;
132 
133         struct osd_dev *osd_dev;
134         struct request *request;
135 
136         struct _osd_req_data_segment {
137                 void *buff;
138                 unsigned alloc_size; /* 0 here means: don't call kfree */
139                 unsigned total_bytes;
140         } cdb_cont, set_attr, enc_get_attr, get_attr;
141 
142         struct _osd_io_info {
143                 struct bio *bio;
144                 u64 total_bytes;
145                 u64 residual;
146                 struct request *req;
147                 struct _osd_req_data_segment *last_seg;
148                 u8 *pad_buff;
149         } out, in;
150 
151         gfp_t alloc_flags;
152         unsigned timeout;
153         unsigned retries;
154         unsigned sense_len;
155         u8 sense[OSD_MAX_SENSE_LEN];
156         enum osd_attributes_mode attributes_mode;
157 
158         osd_req_done_fn *async_done;
159         void *async_private;
160         blk_status_t async_error;
161         int req_errors;
162 };
163 
164 static inline bool osd_req_is_ver1(struct osd_request *or)
165 {
166         return osd_dev_is_ver1(or->osd_dev);
167 }
168 
169 /*
170  * How to use the osd library:
171  *
172  * osd_start_request
173  *      Allocates a request.
174  *
175  * osd_req_*
176  *      Call one of, to encode the desired operation.
177  *
178  * osd_add_{get,set}_attr
179  *      Optionally add attributes to the CDB, list or page mode.
180  *
181  * osd_finalize_request
182  *      Computes final data out/in offsets and signs the request,
183  *      making it ready for execution.
184  *
185  * osd_execute_request
186  *      May be called to execute it through the block layer. Other wise submit
187  *      the associated block request in some other way.
188  *
189  * After execution:
190  * osd_req_decode_sense
191  *      Decodes sense information to verify execution results.
192  *
193  * osd_req_decode_get_attr
194  *      Retrieve osd_add_get_attr_list() values if used.
195  *
196  * osd_end_request
197  *      Must be called to deallocate the request.
198  */
199 
200 /**
201  * osd_start_request - Allocate and initialize an osd_request
202  *
203  * @osd_dev:    OSD device that holds the scsi-device and default values
204  *              that the request is associated with.
205  * @gfp:        The allocation flags to use for request allocation, and all
206  *              subsequent allocations. This will be stored at
207  *              osd_request->alloc_flags, can be changed by user later
208  *
209  * Allocate osd_request and initialize all members to the
210  * default/initial state.
211  */
212 struct osd_request *osd_start_request(struct osd_dev *od, gfp_t gfp);
213 
214 enum osd_req_options {
215         OSD_REQ_FUA = 0x08,     /* Force Unit Access */
216         OSD_REQ_DPO = 0x10,     /* Disable Page Out */
217 
218         OSD_REQ_BYPASS_TIMESTAMPS = 0x80,
219 };
220 
221 /**
222  * osd_finalize_request - Sign request and prepare request for execution
223  *
224  * @or:         osd_request to prepare
225  * @options:    combination of osd_req_options bit flags or 0.
226  * @cap:        A Pointer to an OSD_CAP_LEN bytes buffer that is received from
227  *              The security manager as capabilities for this cdb.
228  * @cap_key:    The cryptographic key used to sign the cdb/data. Can be null
229  *              if NOSEC is used.
230  *
231  * The actual request and bios are only allocated here, so are the get_attr
232  * buffers that will receive the returned attributes. Copy's @cap to cdb.
233  * Sign the cdb/data with @cap_key.
234  */
235 int osd_finalize_request(struct osd_request *or,
236         u8 options, const void *cap, const u8 *cap_key);
237 
238 /**
239  * osd_execute_request - Execute the request synchronously through block-layer
240  *
241  * @or:         osd_request to Executed
242  *
243  * Calls blk_execute_rq to q the command and waits for completion.
244  */
245 int osd_execute_request(struct osd_request *or);
246 
247 /**
248  * osd_execute_request_async - Execute the request without waitting.
249  *
250  * @or:                      - osd_request to Executed
251  * @done: (Optional)         - Called at end of execution
252  * @private:                 - Will be passed to @done function
253  *
254  * Calls blk_execute_rq_nowait to queue the command. When execution is done
255  * optionally calls @done with @private as parameter. @or->async_error will
256  * have the return code
257  */
258 int osd_execute_request_async(struct osd_request *or,
259         osd_req_done_fn *done, void *private);
260 
261 /**
262  * osd_req_decode_sense_full - Decode sense information after execution.
263  *
264  * @or:           - osd_request to examine
265  * @osi           - Receives a more detailed error report information (optional).
266  * @silent        - Do not print to dmsg (Even if enabled)
267  * @bad_obj_list  - Some commands act on multiple objects. Failed objects will
268  *                  be received here (optional)
269  * @max_obj       - Size of @bad_obj_list.
270  * @bad_attr_list - List of failing attributes (optional)
271  * @max_attr      - Size of @bad_attr_list.
272  *
273  * After execution, osd_request results are analyzed using this function. The
274  * return code is the final disposition on the error. So it is possible that a
275  * CHECK_CONDITION was returned from target but this will return NO_ERROR, for
276  * example on recovered errors. All parameters are optional if caller does
277  * not need any returned information.
278  * Note: This function will also dump the error to dmsg according to settings
279  * of the SCSI_OSD_DPRINT_SENSE Kconfig value. Set @silent if you know the
280  * command would routinely fail, to not spam the dmsg file.
281  */
282 
283 /**
284  * osd_err_priority - osd categorized return codes in ascending severity.
285  *
286  * The categories are borrowed from the pnfs_osd_errno enum.
287  * See comments for translated Linux codes returned by osd_req_decode_sense.
288  */
289 enum osd_err_priority {
290         OSD_ERR_PRI_NO_ERROR    = 0,
291         /* Recoverable, caller should clear_highpage() all pages */
292         OSD_ERR_PRI_CLEAR_PAGES = 1, /* -EFAULT */
293         OSD_ERR_PRI_RESOURCE    = 2, /* -ENOMEM */
294         OSD_ERR_PRI_BAD_CRED    = 3, /* -EINVAL */
295         OSD_ERR_PRI_NO_ACCESS   = 4, /* -EACCES */
296         OSD_ERR_PRI_UNREACHABLE = 5, /* any other */
297         OSD_ERR_PRI_NOT_FOUND   = 6, /* -ENOENT */
298         OSD_ERR_PRI_NO_SPACE    = 7, /* -ENOSPC */
299         OSD_ERR_PRI_EIO         = 8, /* -EIO    */
300 };
301 
302 struct osd_sense_info {
303         enum osd_err_priority osd_err_pri;
304 
305         int key;                /* one of enum scsi_sense_keys */
306         int additional_code ;   /* enum osd_additional_sense_codes */
307         union { /* Sense specific information */
308                 u16 sense_info;
309                 u16 cdb_field_offset;   /* scsi_invalid_field_in_cdb */
310         };
311         union { /* Command specific information */
312                 u64 command_info;
313         };
314 
315         u32 not_initiated_command_functions; /* osd_command_functions_bits */
316         u32 completed_command_functions; /* osd_command_functions_bits */
317         struct osd_obj_id obj;
318         struct osd_attr attr;
319 };
320 
321 int osd_req_decode_sense_full(struct osd_request *or,
322         struct osd_sense_info *osi, bool silent,
323         struct osd_obj_id *bad_obj_list, int max_obj,
324         struct osd_attr *bad_attr_list, int max_attr);
325 
326 static inline int osd_req_decode_sense(struct osd_request *or,
327         struct osd_sense_info *osi)
328 {
329         return osd_req_decode_sense_full(or, osi, false, NULL, 0, NULL, 0);
330 }
331 
332 /**
333  * osd_end_request - return osd_request to free store
334  *
335  * @or:         osd_request to free
336  *
337  * Deallocate all osd_request resources (struct req's, BIOs, buffers, etc.)
338  */
339 void osd_end_request(struct osd_request *or);
340 
341 /*
342  * CDB Encoding
343  *
344  * Note: call only one of the following methods.
345  */
346 
347 /*
348  * Device commands
349  */
350 void osd_req_set_master_seed_xchg(struct osd_request *or, ...);/* NI */
351 void osd_req_set_master_key(struct osd_request *or, ...);/* NI */
352 
353 void osd_req_format(struct osd_request *or, u64 tot_capacity);
354 
355 /* list all partitions
356  * @list header must be initialized to zero on first run.
357  *
358  * Call osd_is_obj_list_done() to find if we got the complete list.
359  */
360 int osd_req_list_dev_partitions(struct osd_request *or,
361         osd_id initial_id, struct osd_obj_id_list *list, unsigned nelem);
362 
363 void osd_req_flush_obsd(struct osd_request *or,
364         enum osd_options_flush_scope_values);
365 
366 void osd_req_perform_scsi_command(struct osd_request *or,
367         const u8 *cdb, ...);/* NI */
368 void osd_req_task_management(struct osd_request *or, ...);/* NI */
369 
370 /*
371  * Partition commands
372  */
373 void osd_req_create_partition(struct osd_request *or, osd_id partition);
374 void osd_req_remove_partition(struct osd_request *or, osd_id partition);
375 
376 void osd_req_set_partition_key(struct osd_request *or,
377         osd_id partition, u8 new_key_id[OSD_CRYPTO_KEYID_SIZE],
378         u8 seed[OSD_CRYPTO_SEED_SIZE]);/* NI */
379 
380 /* list all collections in the partition
381  * @list header must be init to zero on first run.
382  *
383  * Call osd_is_obj_list_done() to find if we got the complete list.
384  */
385 int osd_req_list_partition_collections(struct osd_request *or,
386         osd_id partition, osd_id initial_id, struct osd_obj_id_list *list,
387         unsigned nelem);
388 
389 /* list all objects in the partition
390  * @list header must be init to zero on first run.
391  *
392  * Call osd_is_obj_list_done() to find if we got the complete list.
393  */
394 int osd_req_list_partition_objects(struct osd_request *or,
395         osd_id partition, osd_id initial_id, struct osd_obj_id_list *list,
396         unsigned nelem);
397 
398 void osd_req_flush_partition(struct osd_request *or,
399         osd_id partition, enum osd_options_flush_scope_values);
400 
401 /*
402  * Collection commands
403  */
404 void osd_req_create_collection(struct osd_request *or,
405         const struct osd_obj_id *);/* NI */
406 void osd_req_remove_collection(struct osd_request *or,
407         const struct osd_obj_id *);/* NI */
408 
409 /* list all objects in the collection */
410 int osd_req_list_collection_objects(struct osd_request *or,
411         const struct osd_obj_id *, osd_id initial_id,
412         struct osd_obj_id_list *list, unsigned nelem);
413 
414 /* V2 only filtered list of objects in the collection */
415 void osd_req_query(struct osd_request *or, ...);/* NI */
416 
417 void osd_req_flush_collection(struct osd_request *or,
418         const struct osd_obj_id *, enum osd_options_flush_scope_values);
419 
420 void osd_req_get_member_attrs(struct osd_request *or, ...);/* V2-only NI */
421 void osd_req_set_member_attrs(struct osd_request *or, ...);/* V2-only NI */
422 
423 /*
424  * Object commands
425  */
426 void osd_req_create_object(struct osd_request *or, struct osd_obj_id *);
427 void osd_req_remove_object(struct osd_request *or, struct osd_obj_id *);
428 
429 void osd_req_write(struct osd_request *or,
430         const struct osd_obj_id *obj, u64 offset, struct bio *bio, u64 len);
431 int osd_req_write_kern(struct osd_request *or,
432         const struct osd_obj_id *obj, u64 offset, void *buff, u64 len);
433 void osd_req_append(struct osd_request *or,
434         const struct osd_obj_id *, struct bio *data_out);/* NI */
435 void osd_req_create_write(struct osd_request *or,
436         const struct osd_obj_id *, struct bio *data_out, u64 offset);/* NI */
437 void osd_req_clear(struct osd_request *or,
438         const struct osd_obj_id *, u64 offset, u64 len);/* NI */
439 void osd_req_punch(struct osd_request *or,
440         const struct osd_obj_id *, u64 offset, u64 len);/* V2-only NI */
441 
442 void osd_req_flush_object(struct osd_request *or,
443         const struct osd_obj_id *, enum osd_options_flush_scope_values,
444         /*V2*/ u64 offset, /*V2*/ u64 len);
445 
446 void osd_req_read(struct osd_request *or,
447         const struct osd_obj_id *obj, u64 offset, struct bio *bio, u64 len);
448 int osd_req_read_kern(struct osd_request *or,
449         const struct osd_obj_id *obj, u64 offset, void *buff, u64 len);
450 
451 /* Scatter/Gather write/read commands */
452 int osd_req_write_sg(struct osd_request *or,
453         const struct osd_obj_id *obj, struct bio *bio,
454         const struct osd_sg_entry *sglist, unsigned numentries);
455 int osd_req_read_sg(struct osd_request *or,
456         const struct osd_obj_id *obj, struct bio *bio,
457         const struct osd_sg_entry *sglist, unsigned numentries);
458 int osd_req_write_sg_kern(struct osd_request *or,
459         const struct osd_obj_id *obj, void **buff,
460         const struct osd_sg_entry *sglist, unsigned numentries);
461 int osd_req_read_sg_kern(struct osd_request *or,
462         const struct osd_obj_id *obj, void **buff,
463         const struct osd_sg_entry *sglist, unsigned numentries);
464 
465 /*
466  * Root/Partition/Collection/Object Attributes commands
467  */
468 
469 /* get before set */
470 void osd_req_get_attributes(struct osd_request *or, const struct osd_obj_id *);
471 
472 /* set before get */
473 void osd_req_set_attributes(struct osd_request *or, const struct osd_obj_id *);
474 
475 /*
476  * Attributes appended to most commands
477  */
478 
479 /* Attributes List mode (or V2 CDB) */
480   /*
481    * TODO: In ver2 if at finalize time only one attr was set and no gets,
482    * then the Attributes CDB mode is used automatically to save IO.
483    */
484 
485 /* set a list of attributes. */
486 int osd_req_add_set_attr_list(struct osd_request *or,
487         const struct osd_attr *, unsigned nelem);
488 
489 /* get a list of attributes */
490 int osd_req_add_get_attr_list(struct osd_request *or,
491         const struct osd_attr *, unsigned nelem);
492 
493 /*
494  * Attributes list decoding
495  * Must be called after osd_request.request was executed
496  * It is called in a loop to decode the returned get_attr
497  * (see osd_add_get_attr)
498  */
499 int osd_req_decode_get_attr_list(struct osd_request *or,
500         struct osd_attr *, int *nelem, void **iterator);
501 
502 /* Attributes Page mode */
503 
504 /*
505  * Read an attribute page and optionally set one attribute
506  *
507  * Retrieves the attribute page directly to a user buffer.
508  * @attr_page_data shall stay valid until end of execution.
509  * See osd_attributes.h for common page structures
510  */
511 int osd_req_add_get_attr_page(struct osd_request *or,
512         u32 page_id, void *attr_page_data, unsigned max_page_len,
513         const struct osd_attr *set_one);
514 
515 #endif /* __OSD_LIB_H__ */
516 

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