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extmod/vfs_lfsx: Allow overriding the LFS2 on-disk version format.

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Back in LFS2 version 2.6 they updated the on-disk version from 2.0 to 2.1
which broke back compatibility (aka older versions could no long read new
version disk format), see
https://github.com/littlefs-project/littlefs/releases/tag/v2.6.0

Then in LFS2 v2.7 an optional `config->disk_version` was added to force the
library to use an older disk format instead, see:
https://github.com/littlefs-project/littlefs/releases/tag/v2.7.0

This commit simply exposes `config->disk_version` as a compile time option
if LFS2_MULTIVERSION is set, otherwise there is no change in behavior.
This is Useful for compatibility with older LFS versions.

Note: LFS2_MULTIVERSION needs to be defined at the make / CFLAGS level,
setting it in mpconfigboard.h doesn't work as it's not included in the
`lfs2.c` file in any way.

Signed-off-by: Andrew Leech <andrew.leech@planetinnovation.com.au>
This commit is contained in:
Andrew Leech 2025-06-26 14:58:06 +10:00 committed by Damien George
parent 28082d1d25
commit 6515cd05f1
1 changed files with 6 additions and 0 deletions
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6
extmod/vfs_lfsx.c
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@ -104,6 +104,12 @@ static void MP_VFS_LFSx(init_config)(MP_OBJ_VFS_LFSx * self, mp_obj_t bdev, size
config->read_buffer = m_new(uint8_t, config->cache_size);
config->prog_buffer = m_new(uint8_t, config->cache_size);
config->lookahead_buffer = m_new(uint8_t, config->lookahead_size);
#ifdef LFS2_MULTIVERSION
// This can be set to override the on-disk lfs version.
// eg. for compat with lfs2 < v2.6 add the following to make:
// CFLAGS += '-DLFS2_MULTIVERSION=0x00020000'
config->disk_version = LFS2_MULTIVERSION;
#endif
#endif
}