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TDBStore.h
1 /*
2  * Copyright (c) 2018 ARM Limited. All rights reserved.
3  * SPDX-License-Identifier: Apache-2.0
4  * Licensed under the Apache License, Version 2.0 (the License); you may
5  * not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an AS IS BASIS, WITHOUT
12  * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #ifndef MBED_TDBSTORE_H
18 #define MBED_TDBSTORE_H
19 
20 #include <stdint.h>
21 #include <stdio.h>
22 #include "kvstore/KVStore.h"
23 #include "blockdevice/BlockDevice.h"
24 #include "blockdevice/BufferedBlockDevice.h"
25 #include "PlatformMutex.h"
26 #include "mbed_error.h"
27 
28 namespace mbed {
29 
30 /** TDBStore class
31  *
32  * Lightweight Key Value storage over a block device
33  */
34 
35 class TDBStore : public KVStore {
36 public:
37 
38  static const uint32_t RESERVED_AREA_SIZE = 64;
39 
40  /**
41  * @brief Class constructor
42  *
43  * @param[in] bd Underlying block device.
44  *
45  * @returns none
46  */
47  TDBStore(BlockDevice *bd);
48 
49  /**
50  * @brief Class destructor
51  *
52  * @returns none
53  */
54  virtual ~TDBStore();
55 
56  /**
57  * @brief Initialize TDBStore. If data exists, TDBStore will check the data integrity
58  * on initialize. If the integrity checks fails, the TDBStore will use GC to collect
59  * the available data and clean corrupted and erroneous records.
60  *
61  * @returns MBED_SUCCESS Success.
62  * @returns Negative error code on failure.
63  */
64  virtual int init();
65 
66  /**
67  * @brief Deinitialize TDBStore, release and free resources.
68  *
69  * @returns MBED_SUCCESS Success.
70  */
71  virtual int deinit();
72 
73 
74  /**
75  * @brief Reset TDBStore contents (clear all keys) and reserved data
76  *
77  * @returns MBED_SUCCESS Success.
78  * MBED_ERROR_NOT_READY Not initialized.
79  * MBED_ERROR_READ_FAILED Unable to read from media.
80  * MBED_ERROR_WRITE_FAILED Unable to write to media.
81  */
82  virtual int reset();
83 
84  /**
85  * @brief Set one TDBStore item, given key and value.
86  *
87  * @param[in] key Key - must not include '*' '/' '?' ':' ';' '\' '"' '|' ' ' '<' '>' '\'.
88  * @param[in] buffer Value data buffer.
89  * @param[in] size Value data size.
90  * @param[in] create_flags Flag mask.
91  *
92  * @returns MBED_SUCCESS Success.
93  * MBED_ERROR_NOT_READY Not initialized.
94  * MBED_ERROR_READ_FAILED Unable to read from media.
95  * MBED_ERROR_WRITE_FAILED Unable to write to media.
96  * MBED_ERROR_INVALID_ARGUMENT Invalid argument given in function arguments.
97  * MBED_ERROR_INVALID_SIZE Invalid size given in function arguments.
98  * MBED_ERROR_MEDIA_FULL Not enough room on media.
99  * MBED_ERROR_WRITE_PROTECTED Already stored with "write once" flag.
100  */
101  virtual int set(const char *key, const void *buffer, size_t size, uint32_t create_flags);
102 
103  /**
104  * @brief Get one TDBStore item by given key.
105  *
106  * @param[in] key Key - must not include '*' '/' '?' ':' ';' '\' '"' '|' ' ' '<' '>' '\'.
107  * @param[in] buffer Value data buffer.
108  * @param[in] buffer_size Value data buffer size.
109  * @param[out] actual_size Actual read size.
110  * @param[in] offset Offset to read from in data.
111  *
112  * @returns MBED_SUCCESS Success.
113  * MBED_ERROR_NOT_READY Not initialized.
114  * MBED_ERROR_READ_FAILED Unable to read from media.
115  * MBED_ERROR_INVALID_ARGUMENT Invalid argument given in function arguments.
116  * MBED_ERROR_INVALID_SIZE Invalid size given in function arguments.
117  * MBED_ERROR_INVALID_DATA_DETECTED Data is corrupt.
118  * MBED_ERROR_ITEM_NOT_FOUND No such key.
119  */
120  virtual int get(const char *key, void *buffer, size_t buffer_size, size_t *actual_size = NULL,
121  size_t offset = 0);
122 
123  /**
124  * @brief Get information of a given key. The returned info contains size and flags
125  *
126  * @param[in] key Key - must not include '*' '/' '?' ':' ';' '\' '"' '|' ' ' '<' '>' '\'.
127  * @param[out] info Returned information structure.
128  *
129  * @returns MBED_SUCCESS Success.
130  * MBED_ERROR_NOT_READY Not initialized.
131  * MBED_ERROR_READ_FAILED Unable to read from media.
132  * MBED_ERROR_INVALID_ARGUMENT Invalid argument given in function arguments.
133  * MBED_ERROR_INVALID_DATA_DETECTED Data is corrupt.
134  * MBED_ERROR_ITEM_NOT_FOUND No such key.
135  */
136  virtual int get_info(const char *key, info_t *info);
137 
138  /**
139  * @brief Remove a TDBStore item by given key.
140  *
141  * @param[in] key Key - must not include '*' '/' '?' ':' ';' '\' '"' '|' ' ' '<' '>' '\'.
142  *
143  * @returns MBED_SUCCESS Success.
144  * MBED_ERROR_NOT_READY Not initialized.
145  * MBED_ERROR_READ_FAILED Unable to read from media.
146  * MBED_ERROR_WRITE_FAILED Unable to write to media.
147  * MBED_ERROR_INVALID_ARGUMENT Invalid argument given in function arguments.
148  * MBED_ERROR_MEDIA_FULL Not enough room on media.
149  * MBED_ERROR_ITEM_NOT_FOUND No such key.
150  * MBED_ERROR_WRITE_PROTECTED Already stored with "write once" flag.
151  */
152  virtual int remove(const char *key);
153 
154 
155  /**
156  * @brief Start an incremental TDBStore set sequence. This operation is blocking other operations.
157  * Any get/set/remove/iterator operation will be blocked until set_finalize is called.
158  *
159  * @param[out] handle Returned incremental set handle.
160  * @param[in] key Key - must not include '*' '/' '?' ':' ';' '\' '"' '|' ' ' '<' '>' '\'.
161  * @param[in] final_data_size Final value data size.
162  * @param[in] create_flags Flag mask.
163  *
164  * @returns MBED_SUCCESS Success.
165  * MBED_ERROR_NOT_READY Not initialized.
166  * MBED_ERROR_READ_FAILED Unable to read from media.
167  * MBED_ERROR_WRITE_FAILED Unable to write to media.
168  * MBED_ERROR_INVALID_ARGUMENT Invalid argument given in function arguments.
169  * MBED_ERROR_INVALID_SIZE Invalid size given in function arguments.
170  * MBED_ERROR_MEDIA_FULL Not enough room on media.
171  * MBED_ERROR_WRITE_PROTECTED Already stored with "write once" flag.
172  */
173  virtual int set_start(set_handle_t *handle, const char *key, size_t final_data_size, uint32_t create_flags);
174 
175  /**
176  * @brief Add data to incremental TDBStore set sequence. This operation is blocking other operations.
177  * Any get/set/remove operation will be blocked until set_finalize will be called.
178  *
179  * @param[in] handle Incremental set handle.
180  * @param[in] value_data Value data to add.
181  * @param[in] data_size Value data size.
182  *
183  * @returns MBED_SUCCESS Success.
184  * MBED_ERROR_NOT_READY Not initialized.
185  * MBED_ERROR_WRITE_FAILED Unable to write to media.
186  * MBED_ERROR_INVALID_ARGUMENT Invalid argument given in function arguments.
187  * MBED_ERROR_INVALID_SIZE Invalid size given in function arguments.
188  */
189  virtual int set_add_data(set_handle_t handle, const void *value_data, size_t data_size);
190 
191  /**
192  * @brief Finalize an incremental KVStore set sequence.
193  *
194  * @param[in] handle Incremental set handle.
195  *
196  * @returns MBED_SUCCESS Success.
197  * MBED_ERROR_NOT_READY Not initialized.
198  * MBED_ERROR_WRITE_FAILED Unable to write to media.
199  * MBED_ERROR_INVALID_ARGUMENT Invalid argument given in function arguments.
200  */
201  virtual int set_finalize(set_handle_t handle);
202 
203  /**
204  * @brief Start an iteration over KVStore keys.
205  * There are no issues with any other operations while iterator is open.
206  *
207  * @param[out] it Returned iterator handle.
208  * @param[in] prefix Key prefix (null for all keys).
209  *
210  * @returns MBED_SUCCESS Success.
211  * MBED_ERROR_NOT_READY Not initialized.
212  * MBED_ERROR_INVALID_ARGUMENT Invalid argument given in function arguments.
213  */
214  virtual int iterator_open(iterator_t *it, const char *prefix = NULL);
215 
216  /**
217  * @brief Get next key in iteration.
218  * There are no issues with any other operations while iterator is open.
219  *
220  * @param[in] it Iterator handle.
221  * @param[in] key Buffer for returned key.
222  * @param[in] key_size Key buffer size.
223  *
224  * @returns MBED_SUCCESS Success.
225  * MBED_ERROR_NOT_READY Not initialized.
226  * MBED_ERROR_READ_FAILED Unable to read from block device.
227  * MBED_ERROR_INVALID_ARGUMENT Invalid argument given in function arguments.
228  * MBED_ERROR_INVALID_SIZE Invalid size given in function arguments.
229  * MBED_ERROR_INVALID_DATA_DETECTED Data is corrupt.
230  * MBED_ERROR_ITEM_NOT_FOUND No more keys found.
231  */
232  virtual int iterator_next(iterator_t it, char *key, size_t key_size);
233 
234  /**
235  * @brief Close iteration.
236  *
237  * @param[in] it Iterator handle.
238  *
239  * @returns MBED_SUCCESS Success.
240  * MBED_ERROR_NOT_READY Not initialized.
241  * MBED_ERROR_INVALID_ARGUMENT Invalid argument given in function arguments.
242  */
243  virtual int iterator_close(iterator_t it);
244 
245  /**
246  * @brief Set data in reserved area, which is a special location for special data, such as ROT.
247  * The data written to reserved area can't be overwritten.
248  *
249  * @param[in] reserved_data Reserved data buffer.
250  * @param[in] reserved_data_buf_size
251  * Reserved data buffer size.
252  *
253  * @returns MBED_SUCCESS Success.
254  * MBED_ERROR_NOT_READY Not initialized.
255  * MBED_ERROR_READ_FAILED Unable to read from media.
256  * MBED_ERROR_WRITE_FAILED Unable to write to media.
257  * MBED_ERROR_INVALID_ARGUMENT Invalid argument given in function arguments.
258  * MBED_ERROR_INVALID_SIZE Invalid size given in function arguments.
259  */
260  virtual int reserved_data_set(const void *reserved_data, size_t reserved_data_buf_size);
261 
262  /**
263  * @brief Get data from reserved area, which is a special location for special data, such as ROT.
264  *
265  * @param[in] reserved_data Reserved data buffer.
266  * @param[in] reserved_data_buf_size
267  * Reserved data buffer size.
268  * @param[in] actual_data_size Return data size.
269  *
270  * @returns MBED_SUCCESS Success.
271  * MBED_ERROR_NOT_READY Not initialized.
272  * MBED_ERROR_READ_FAILED Unable to read from media.
273  * MBED_ERROR_INVALID_ARGUMENT Invalid argument given in function arguments.
274  * MBED_ERROR_INVALID_DATA_DETECTED Data is corrupt.
275  * MBED_ERROR_ITEM_NOT_FOUND No reserved data was written.
276  */
277  virtual int reserved_data_get(void *reserved_data, size_t reserved_data_buf_size,
278  size_t *actual_data_size = 0);
279 
280 #if !defined(DOXYGEN_ONLY)
281 private:
282 
283  typedef struct {
284  uint32_t address;
285  size_t size;
286  } tdbstore_area_data_t;
287 
288  static const int _num_areas = 2;
289  static const int _max_open_iterators = 16;
290 
291  PlatformMutex _mutex;
292  PlatformMutex _inc_set_mutex;
293  void *_ram_table;
294  size_t _max_keys;
295  size_t _num_keys;
296  BlockDevice *_bd;
297  BufferedBlockDevice *_buff_bd;
298  uint32_t _free_space_offset;
299  uint32_t _master_record_offset;
300  uint32_t _master_record_size;
301  bool _is_initialized;
302  int _active_area;
303  uint16_t _active_area_version;
304  size_t _size;
305  tdbstore_area_data_t _area_params[_num_areas];
306  uint32_t _prog_size;
307  uint8_t *_work_buf;
308  size_t _work_buf_size;
309  char *_key_buf;
310  void *_inc_set_handle;
311  void *_iterator_table[_max_open_iterators];
312 
313  /**
314  * @brief Read a block from an area.
315  *
316  * @param[in] area Area.
317  * @param[in] offset Offset in area.
318  * @param[in] size Number of bytes to read.
319  * @param[in] buf Output buffer.
320  *
321  * @returns 0 for success, nonzero for failure.
322  */
323  int read_area(uint8_t area, uint32_t offset, uint32_t size, void *buf);
324 
325  /**
326  * @brief Write a block to an area.
327  *
328  * @param[in] area Area.
329  * @param[in] offset Offset in area.
330  * @param[in] size Number of bytes to write.
331  * @param[in] buf Input buffer.
332  *
333  * @returns 0 for success, non-zero for failure.
334  */
335  int write_area(uint8_t area, uint32_t offset, uint32_t size, const void *buf);
336 
337  /**
338  * @brief Reset an area (erase its start).
339  * This erases master record, but preserves the
340  * reserved area data.
341  *
342  * @param[in] area Area.
343  *
344  * @returns 0 for success, nonzero for failure.
345  */
346  int reset_area(uint8_t area);
347 
348  /**
349  * @brief Erase an erase unit.
350  *
351  * @param[in] area Area.
352  * @param[in] offset Offset in area.
353  *
354  * @returns 0 for success, nonzero for failure.
355  */
356  int erase_erase_unit(uint8_t area, uint32_t offset);
357 
358  /**
359  * @brief Calculate addresses and sizes of areas.
360  */
361  void calc_area_params();
362 
363  /**
364  * @brief Read a TDBStore record from a given location.
365  *
366  * @param[in] area Area.
367  * @param[in] offset Offset of record in area.
368  * @param[out] key Key - must not include '*' '/' '?' ':' ';' '\' '"' '|' ' ' '<' '>' '\'.
369  * @param[out] data_buf Data buffer.
370  * @param[in] data_buf_size Data buffer size.
371  * @param[out] actual_data_size Actual data size.
372  * @param[in] data_offset Offset in data.
373  * @param[in] copy_key Copy key to user buffer.
374  * @param[in] copy_data Copy data to user buffer.
375  * @param[in] check_expected_key Check whether key belongs to this record.
376  * @param[in] calc_hash Calculate hash (on key).
377  * @param[out] hash Calculated hash.
378  * @param[out] flags Record flags.
379  * @param[out] next_offset Offset of next record.
380  *
381  * @returns 0 for success, nonzero for failure.
382  */
383  int read_record(uint8_t area, uint32_t offset, char *key,
384  void *data_buf, uint32_t data_buf_size,
385  uint32_t &actual_data_size, size_t data_offset, bool copy_key,
386  bool copy_data, bool check_expected_key, bool calc_hash,
387  uint32_t &hash, uint32_t &flags, uint32_t &next_offset);
388 
389  /**
390  * @brief Write a master record of a given area.
391  *
392  * @param[in] area Area.
393  * @param[in] version Area version.
394  * @param[out] next_offset Offset of next record.
395  *
396  * @returns 0 for success, nonzero for failure.
397  */
398  int write_master_record(uint8_t area, uint16_t version, uint32_t &next_offset);
399 
400  /**
401  * @brief Copy a record from one area to the opposite one.
402  *
403  * @param[in] from_area Area to copy record from.
404  * @param[in] from_offset Offset in source area.
405  * @param[in] to_offset Offset in destination area.
406  * @param[out] to_next_offset Offset of next record in destination area.
407  *
408  * @returns 0 for success, nonzero for failure.
409  */
410  int copy_record(uint8_t from_area, uint32_t from_offset, uint32_t to_offset,
411  uint32_t &to_next_offset);
412 
413  /**
414  * @brief Garbage collection (compact all records from active area to the standby one).
415  *
416  * @returns 0 for success, nonzero for failure.
417  */
418  int garbage_collection();
419 
420  /**
421  * @brief Return record size given key and data size.
422  *
423  * @param[in] key Key - must not include '*' '/' '?' ':' ';' '\' '"' '|' ' ' '<' '>' '\'.
424  * @param[in] data_size Data size.
425  *
426  * @returns record size.
427  */
428  uint32_t record_size(const char *key, uint32_t data_size);
429 
430  /**
431  * @brief Find a record given key
432  *
433  * @param[in] area Area.
434  * @param[in] key Key - must not include '*' '/' '?' ':' ';' '\' '"' '|' ' ' '<' '>' '\'.
435  * @param[out] offset Offset of record.
436  * @param[out] ram_table_ind Index in RAM table (target one if not found).
437  * @param[out] hash Calculated key hash.
438  *
439  * @returns 0 for success, nonzero for failure.
440  */
441  int find_record(uint8_t area, const char *key, uint32_t &offset,
442  uint32_t &ram_table_ind, uint32_t &hash);
443  /**
444  * @brief Actual logics of get API (also covers all other get APIs).
445  *
446  * @param[in] key Key - must not include '*' '/' '?' ':' ';' '\' '"' '|' ' ' '<' '>' '\'.
447  * @param[in] copy_data Copy data to user buffer.
448  * @param[in] data_buf Buffer to store data on.
449  * @param[in] data_buf_size Data buffer size (bytes).
450  * @param[out] actual_data_size Actual data size (bytes).
451  * @param[out] flags Flags.
452  *
453  * @returns 0 for success, nonzero for failure.
454  */
455  int do_get(const char *key, bool copy_data,
456  void *data_buf, uint32_t data_buf_size, uint32_t &actual_data_size,
457  uint32_t &flags);
458 
459  /**
460  * @brief Actual logics of set API (covers also the remove API).
461  *
462  * @param[in] key Key - must not include '*' '/' '?' ':' ';' '\' '"' '|' ' ' '<' '>' '\'.
463  * @param[in] data_buf Data buffer.
464  * @param[in] data_buf_size Data buffer size (bytes).
465  * @param[in] flags Flags.
466  *
467  * @returns 0 for success, nonzero for failure.
468  */
469  int do_set(const char *key, const void *data_buf, uint32_t data_buf_size, uint32_t flags);
470 
471  /**
472  * @brief Build RAM table and update _free_space_offset (scanning all the records in the area).
473  *
474  * @returns 0 for success, nonzero for failure.
475  */
476  int build_ram_table();
477 
478  /**
479  * @brief Increment maximum number of keys and reallocate RAM table accordingly.
480  *
481  * @param[out] ram_table Updated RAM table.
482  *
483  * @returns 0 for success, nonzero for failure.
484  */
485  int increment_max_keys(void **ram_table = 0);
486 
487  /**
488  * @brief Calculate offset from start of erase unit.
489  *
490  * @param[in] area Area.
491  * @param[in] offset Offset in area.
492  * @param[out] offset_from_start Offset from start of erase unit.
493  * @param[out] dist_to_end Distance to end of erase unit.
494  *
495  * @returns offset in erase unit.
496  */
497  void offset_in_erase_unit(uint8_t area, uint32_t offset, uint32_t &offset_from_start,
498  uint32_t &dist_to_end);
499 
500  /**
501  * @brief Before writing a record, check whether you are crossing an erase unit.
502  * If you do, check if it's erased, and erase it if not.
503  *
504  * @param[in] area Area.
505  * @param[in] offset Offset in area.
506  * @param[in] size Write size.
507  * @param[in] force_check Force checking.
508  *
509  * @returns 0 for success, nonzero for failure.
510  */
511  int check_erase_before_write(uint8_t area, uint32_t offset, uint32_t size,
512  bool force_check = false);
513 
514  /**
515  * @brief Get data from reserved area - worker function.
516  * This verifies that reserved data on both areas have
517  * correct checksums. If given pointer is not NULL, also
518  * write the reserved data to buffer. If checksums are not
519  * valid, return error code, and don't write anything to any
520  * pointers.
521  *
522  * @param[out] reserved_data Reserved data buffer (NULL to return nothing).
523  * @param[in] reserved_data_buf_size
524  * Reserved data buffer size.
525  * @param[out] actual_data_size If not NULL, return actual data size.
526  * @param[out] copy_trailer If not NULL, copy the trailer content to given buffer.
527  *
528  * @returns 0 on success or a negative error code on failure
529  */
530  int do_reserved_data_get(void *reserved_data, size_t reserved_data_buf_size,
531  size_t *actual_data_size = 0, void *copy_trailer = 0);
532 
533  /**
534  * @brief Update all iterators after adding or deleting of keys.
535  *
536  * @param[in] added True if added, false if deleted.
537  * @param[in] ram_table_ind RAM table index.
538  *
539  * @returns none
540  */
541  void update_all_iterators(bool added, uint32_t ram_table_ind);
542 
543 #endif
544 
545 };
546 /** @}*/
547 
548 } // namespace mbed
549 
550 #endif
mbed::TDBStore::set_finalize
virtual int set_finalize(set_handle_t handle)
Finalize an incremental KVStore set sequence.
mbed::KVStore::info
Holds key information.
Definition: KVStore.h:48
mbed::TDBStore::~TDBStore
virtual ~TDBStore()
Class destructor.
mbed::BlockDevice
A hardware device capable of writing and reading blocks.
Definition: BlockDevice.h:48
mbed::TDBStore::TDBStore
TDBStore(BlockDevice *bd)
Class constructor.
mbed::TDBStore::set_start
virtual int set_start(set_handle_t *handle, const char *key, size_t final_data_size, uint32_t create_flags)
Start an incremental TDBStore set sequence.
mbed::TDBStore::init
virtual int init()
Initialize TDBStore.
mbed::TDBStore::iterator_next
virtual int iterator_next(iterator_t it, char *key, size_t key_size)
Get next key in iteration.
mbed::TDBStore::iterator_open
virtual int iterator_open(iterator_t *it, const char *prefix=NULL)
Start an iteration over KVStore keys.
mbed::TDBStore::set_add_data
virtual int set_add_data(set_handle_t handle, const void *value_data, size_t data_size)
Add data to incremental TDBStore set sequence.
PlatformMutex
The PlatformMutex class is used to synchronize the execution of threads.
Definition: PlatformMutex.h:47
mbed::BufferedBlockDevice
Block device for allowing minimal read and program sizes (of 1) for the underlying BD...
Definition: BufferedBlockDevice.h:31
mbed::KVStore
KVStore class.
Definition: KVStore.h:30
mbed::TDBStore::deinit
virtual int deinit()
Deinitialize TDBStore, release and free resources.
mbed::TDBStore
TDBStore class.
Definition: TDBStore.h:35
mbed::TDBStore::get_info
virtual int get_info(const char *key, info_t *info)
Get information of a given key.
mbed::TDBStore::reset
virtual int reset()
Reset TDBStore contents (clear all keys) and reserved data.
mbed::TDBStore::reserved_data_set
virtual int reserved_data_set(const void *reserved_data, size_t reserved_data_buf_size)
Set data in reserved area, which is a special location for special data, such as ROT.
mbed::TDBStore::iterator_close
virtual int iterator_close(iterator_t it)
Close iteration.
mbed
Definition: ATHandler.h:46
mbed::TDBStore::reserved_data_get
virtual int reserved_data_get(void *reserved_data, size_t reserved_data_buf_size, size_t *actual_data_size=0)
Get data from reserved area, which is a special location for special data, such as ROT...
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