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https://github.com/eledio-devices/thirdparty-littlefs.git
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ff84902970
Block device tracing has a lot of potential uses, of course debugging, but it can also be used for profiling and externally tracking littlefs's usage of the block device. However, block device tracing emits a massive amount of output. So keeping block device tracing on by default limits the usefulness of the filesystem tracing. So, instead, I've moved the block device tracing into a separate LFS_TESTBD_YES_TRACE define which switches on the LFS_TESTBD_TRACE macro. Note that this means in order to get block device tracing, you need to define both LFS_YES_TRACE and LFS_TESTBD_YES_TRACE. This is needed as the LFS_TRACE definition is gated by LFS_YES_TRACE in lfs_util.h.
76 lines
1.8 KiB
C
76 lines
1.8 KiB
C
/*
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* Block device emulated in RAM
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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_RAMBD_H
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#define LFS_RAMBD_H
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#include "lfs.h"
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#include "lfs_util.h"
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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// Block device specific tracing
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#ifdef LFS_RAMBD_YES_TRACE
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#define LFS_RAMBD_TRACE(...) LFS_TRACE(__VA_ARGS__)
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#else
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#define LFS_RAMBD_TRACE(...)
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#endif
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// rambd config (optional)
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struct lfs_rambd_config {
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// 8-bit erase value to simulate erasing with. -1 indicates no erase
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// occurs, which is still a valid block device
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int32_t erase_value;
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// Optional statically allocated buffer for the block device.
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void *buffer;
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};
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// rambd state
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typedef struct lfs_rambd {
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uint8_t *buffer;
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const struct lfs_rambd_config *cfg;
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} lfs_rambd_t;
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// Create a RAM block device using the geometry in lfs_config
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int lfs_rambd_create(const struct lfs_config *cfg);
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int lfs_rambd_createcfg(const struct lfs_config *cfg,
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const struct lfs_rambd_config *bdcfg);
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// Clean up memory associated with block device
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int lfs_rambd_destroy(const struct lfs_config *cfg);
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// Read a block
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int lfs_rambd_read(const struct lfs_config *cfg, 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_rambd_prog(const struct lfs_config *cfg, 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_rambd_erase(const struct lfs_config *cfg, lfs_block_t block);
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// Sync the block device
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int lfs_rambd_sync(const struct lfs_config *cfg);
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#ifdef __cplusplus
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} /* extern "C" */
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#endif
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#endif
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