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ExhaustibleBlockDevice Class Reference
Heap backed block device which simulates failures. More...
#include <ExhaustibleBlockDevice.h>
Inherits BlockDevice.
Public Member Functions | |
| ExhaustibleBlockDevice (BlockDevice *bd, uint32_t erase_cycles) | |
| Lifetime of the block device. | |
| uint32_t | get_erase_cycles (bd_addr_t addr) const |
| Get the number of erase cycles remaining on a block. | |
| void | set_erase_cycles (bd_addr_t addr, uint32_t cycles) |
| Set the number of erase cycles before failure. | |
| virtual int | init () |
| Initialize a block device. | |
| virtual int | deinit () |
| Deinitialize a block device. | |
| virtual int | sync () |
| Ensure data on storage is in sync with the driver. | |
| virtual int | read (void *buffer, bd_addr_t addr, bd_size_t size) |
| Read blocks from a block device. | |
| virtual int | program (const void *buffer, bd_addr_t addr, bd_size_t size) |
| Program blocks to a block device. | |
| virtual int | erase (bd_addr_t addr, bd_size_t size) |
| Erase blocks on a block device. | |
| virtual bd_size_t | get_read_size () const |
| Get the size of a readable block. | |
| virtual bd_size_t | get_program_size () const |
| Get the size of a programmable block. | |
| virtual bd_size_t | get_erase_size () const |
| Get the size of an erasable block. | |
| virtual bd_size_t | get_erase_size (bd_addr_t addr) const |
| Get the size of an erasable block given address. | |
| virtual int | get_erase_value () const |
| Get the value of storage when erased. | |
| virtual bd_size_t | size () const |
| Get the total size of the underlying device. | |
| virtual int | trim (bd_addr_t addr, bd_size_t size) |
| Mark blocks as no longer in use. | |
| bool | is_valid_read (bd_addr_t addr, bd_size_t size) const |
| Convenience function for checking block read validity. | |
| bool | is_valid_program (bd_addr_t addr, bd_size_t size) const |
| Convenience function for checking block program validity. | |
| bool | is_valid_erase (bd_addr_t addr, bd_size_t size) const |
| Convenience function for checking block erase validity. | |
Static Public Member Functions | |
| static BlockDevice * | get_default_instance () |
| Return the default block device. | |
Detailed Description
Heap backed block device which simulates failures.
Similar to heap block device but sectors wear out and are no longer programmable after a configurable number of cycles.
Definition at line 34 of file ExhaustibleBlockDevice.h.
Constructor & Destructor Documentation
| ExhaustibleBlockDevice | ( | BlockDevice * | bd, |
| uint32_t | erase_cycles | ||
| ) |
Lifetime of the block device.
- Parameters:
-
bd Block device to back the ExhaustibleBlockDevice erase_cycles Number of erase cycles before failure
Definition at line 22 of file ExhaustibleBlockDevice.cpp.
Member Function Documentation
| int deinit | ( | ) | [virtual] |
Deinitialize a block device.
- Returns:
- 0 on success or a negative error code on failure
Implements BlockDevice.
Definition at line 63 of file ExhaustibleBlockDevice.cpp.
| int erase | ( | bd_addr_t | addr, |
| bd_size_t | size | ||
| ) | [virtual] |
Erase blocks on a block device.
The state of an erased block is undefined until it has been programmed, unless get_erase_value returns a non-negative byte value
- Parameters:
-
addr Address of block to begin erasing size Size to erase in bytes, must be a multiple of erase block size
- Returns:
- 0 on success, negative error code on failure
Reimplemented from BlockDevice.
Definition at line 114 of file ExhaustibleBlockDevice.cpp.
| MBED_WEAK BlockDevice * get_default_instance | ( | ) | [static, inherited] |
Return the default block device.
Returns the default BlockDevice base on configuration json. Use the components in target.json or application config to change the default block device.
An application can override all target settings by implementing BlockDevice::get_default_instance() themselves - the default definition is weak, and calls get_target_default_instance().
Definition at line 35 of file SystemStorage.cpp.
| uint32_t get_erase_cycles | ( | bd_addr_t | addr ) | const |
Get the number of erase cycles remaining on a block.
- Parameters:
-
addr Any address in the block being queried for erase cycles
- Returns:
- Number of erase cycles remaining
| bd_size_t get_erase_size | ( | ) | const [virtual] |
Get the size of an erasable block.
- Returns:
- Size of an erasable block in bytes
Reimplemented from BlockDevice.
Definition at line 160 of file ExhaustibleBlockDevice.cpp.
| bd_size_t get_erase_size | ( | bd_addr_t | addr ) | const [virtual] |
Get the size of an erasable block given address.
- Parameters:
-
addr Address within the erasable block
- Returns:
- Size of an erasable block in bytes
- Note:
- Must be a multiple of the program size
Reimplemented from BlockDevice.
Definition at line 169 of file ExhaustibleBlockDevice.cpp.
| int get_erase_value | ( | ) | const [virtual] |
Get the value of storage when erased.
If get_erase_value returns a non-negative byte value, the underlying storage is set to that value when erased, and storage containing that value can be programmed without another erase.
- Returns:
- The value of storage when erased, or -1 if you can't rely on the value of erased storage
Reimplemented from BlockDevice.
Definition at line 178 of file ExhaustibleBlockDevice.cpp.
| bd_size_t get_program_size | ( | ) | const [virtual] |
Get the size of a programmable block.
- Returns:
- Size of a programmable block in bytes
Implements BlockDevice.
Definition at line 151 of file ExhaustibleBlockDevice.cpp.
| bd_size_t get_read_size | ( | ) | const [virtual] |
Get the size of a readable block.
- Returns:
- Size of a readable block in bytes
Implements BlockDevice.
Definition at line 142 of file ExhaustibleBlockDevice.cpp.
| int init | ( | ) | [virtual] |
Initialize a block device.
- Returns:
- 0 on success or a negative error code on failure
Implements BlockDevice.
Definition at line 32 of file ExhaustibleBlockDevice.cpp.
| bool is_valid_erase | ( | bd_addr_t | addr, |
| bd_size_t | size | ||
| ) | const [inherited] |
Convenience function for checking block erase validity.
- Parameters:
-
addr Address of block to begin erasing size Size to erase in bytes
- Returns:
- True if erase is valid for underlying block device
Definition at line 226 of file BlockDevice.h.
| bool is_valid_program | ( | bd_addr_t | addr, |
| bd_size_t | size | ||
| ) | const [inherited] |
Convenience function for checking block program validity.
- Parameters:
-
addr Address of block to begin writing to size Size to write in bytes
- Returns:
- True if program is valid for underlying block device
Definition at line 212 of file BlockDevice.h.
| bool is_valid_read | ( | bd_addr_t | addr, |
| bd_size_t | size | ||
| ) | const [inherited] |
Convenience function for checking block read validity.
- Parameters:
-
addr Address of block to begin reading from size Size to read in bytes
- Returns:
- True if read is valid for underlying block device
Definition at line 198 of file BlockDevice.h.
| int program | ( | const void * | buffer, |
| bd_addr_t | addr, | ||
| bd_size_t | size | ||
| ) | [virtual] |
Program blocks to a block device.
The blocks must have been erased prior to being programmed
- Parameters:
-
buffer Buffer of data to write to blocks addr Address of block to begin writing to size Size to write in bytes, must be a multiple of program block size
- Returns:
- 0 on success, negative error code on failure
Implements BlockDevice.
Definition at line 99 of file ExhaustibleBlockDevice.cpp.
| int read | ( | void * | buffer, |
| bd_addr_t | addr, | ||
| bd_size_t | size | ||
| ) | [virtual] |
Read blocks from a block device.
- Parameters:
-
buffer Buffer to read blocks into addr Address of block to begin reading from size Size to read in bytes, must be a multiple of read block size
- Returns:
- 0 on success, negative error code on failure
Implements BlockDevice.
Definition at line 90 of file ExhaustibleBlockDevice.cpp.
| void set_erase_cycles | ( | bd_addr_t | addr, |
| uint32_t | cycles | ||
| ) |
Set the number of erase cycles before failure.
- Parameters:
-
addr Any address in the block being queried for erase cycles cycles Erase cycles before the block malfunctions
| bd_size_t size | ( | ) | const [virtual] |
Get the total size of the underlying device.
- Returns:
- Size of the underlying device in bytes
Implements BlockDevice.
Definition at line 187 of file ExhaustibleBlockDevice.cpp.
| int sync | ( | ) | [virtual] |
Ensure data on storage is in sync with the driver.
- Returns:
- 0 on success or a negative error code on failure
Reimplemented from BlockDevice.
Definition at line 81 of file ExhaustibleBlockDevice.cpp.
| virtual int trim | ( | bd_addr_t | addr, |
| bd_size_t | size | ||
| ) | [virtual, inherited] |
Mark blocks as no longer in use.
This function provides a hint to the underlying block device that a region of blocks is no longer in use and may be erased without side effects. Erase must still be called before programming, but trimming allows flash-translation-layers to schedule erases when the device is not busy.
- Parameters:
-
addr Address of block to mark as unused size Size to mark as unused in bytes, must be a multiple of erase block size
- Returns:
- 0 on success, negative error code on failure
Reimplemented in SDBlockDevice, and BufferedBlockDevice.
Definition at line 133 of file BlockDevice.h.
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