mirror of
https://github.com/eledio-devices/thirdparty-littlefs.git
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a7cdd563f6
This is a style change to make littlefs's callbacks consistent with most callback declarations found in C. That is, taking in a user-provided `void*`. Previously, these callbacks took a pointer to the config struct itself, which indirectly contained a user provided context, and this gets the job done, but taking in a callback with a `void*` is arguably more expected, has a better chance of integrating with C++/OS-specific code, and is more likely to be optimized out by a clever compiler. --- As a part of these changes, the geometry for the test bds needed to be moved into bd specific configuration objects. This is a good change as it also allows for testing situations where littlefs's geometry does not match the underlying bd.
85 lines
2.0 KiB
C
85 lines
2.0 KiB
C
/*
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* Block device emulated in a file
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*
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* Copyright (c) 2017, Arm Limited. All rights reserved.
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#ifndef LFS_FILEBD_H
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#define LFS_FILEBD_H
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#include "lfs.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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// Block device specific tracing
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#ifdef LFS_FILEBD_YES_TRACE
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#define LFS_FILEBD_TRACE(...) LFS_TRACE(__VA_ARGS__)
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#else
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#define LFS_FILEBD_TRACE(...)
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#endif
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// filebd config (optional)
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struct lfs_filebd_cfg {
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// Minimum size of block read. All read operations must be a
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// multiple of this value.
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lfs_size_t read_size;
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// Minimum size of block program. All program operations must be a
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// multiple of this value.
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lfs_size_t prog_size;
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// Size of an erasable block.
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lfs_size_t erase_size;
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// Number of erasable blocks on the device.
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lfs_size_t erase_count;
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// 8-bit erase value to use for simulating erases. -1 does not simulate
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// erases, which can speed up testing by avoiding all the extra block-device
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// operations to store the erase value.
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int32_t erase_value;
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};
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// filebd state
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typedef struct lfs_filebd {
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int fd;
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struct lfs_filebd_cfg cfg;
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} lfs_filebd_t;
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// Create a file block device using the geometry in lfs_filebd_cfg
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int lfs_filebd_createcfg(lfs_filebd_t *bd, const char *path,
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const struct lfs_filebd_cfg *cfg);
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// Clean up memory associated with block device
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int lfs_filebd_destroy(lfs_filebd_t *bd);
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// Read a block
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int lfs_filebd_read(lfs_filebd_t *bd, lfs_block_t block,
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lfs_off_t off, void *buffer, lfs_size_t size);
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// Program a block
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//
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// The block must have previously been erased.
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int lfs_filebd_prog(lfs_filebd_t *bd, lfs_block_t block,
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lfs_off_t off, const void *buffer, lfs_size_t size);
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// Erase a block
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//
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// A block must be erased before being programmed. The
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// state of an erased block is undefined.
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int lfs_filebd_erase(lfs_filebd_t *bd, lfs_block_t block);
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// Sync the block device
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int lfs_filebd_sync(lfs_filebd_t *bd);
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#ifdef __cplusplus
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}
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#endif
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#endif
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