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extmod/vfs: Add autodetect of littlefs filesystem when mounting.

This commit is contained in:
Damien George 2019-10-29 17:16:30 +11:00
parent 2f71d66ef7
commit 9b27069e2f
1 changed files with 43 additions and 4 deletions
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47
extmod/vfs.c
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@ -38,6 +38,10 @@
#include "extmod/vfs_fat.h"
#endif
#if MICROPY_VFS_LFS1 || MICROPY_VFS_LFS2
#include "extmod/vfs_lfs.h"
#endif
#if MICROPY_VFS_POSIX
#include "extmod/vfs_posix.h"
#endif
@ -156,6 +160,44 @@ mp_import_stat_t mp_vfs_import_stat(const char *path) {
}
}
STATIC mp_obj_t mp_vfs_autodetect(mp_obj_t bdev_obj) {
#if MICROPY_VFS_LFS1 || MICROPY_VFS_LFS2
nlr_buf_t nlr;
if (nlr_push(&nlr) == 0) {
mp_obj_t vfs = MP_OBJ_NULL;
mp_vfs_blockdev_t blockdev;
mp_vfs_blockdev_init(&blockdev, bdev_obj);
uint8_t buf[44];
mp_vfs_blockdev_read_ext(&blockdev, 0, 8, sizeof(buf), buf);
#if MICROPY_VFS_LFS1
if (memcmp(&buf[32], "littlefs", 8) == 0) {
// LFS1
vfs = mp_type_vfs_lfs1.make_new(&mp_type_vfs_lfs1, 1, 0, &bdev_obj);
nlr_pop();
return vfs;
}
#endif
#if MICROPY_VFS_LFS2
if (memcmp(&buf[0], "littlefs", 8) == 0) {
// LFS2
vfs = mp_type_vfs_lfs2.make_new(&mp_type_vfs_lfs2, 1, 0, &bdev_obj);
nlr_pop();
return vfs;
}
#endif
nlr_pop();
} else {
// Ignore exception (eg block device doesn't support extended readblocks)
}
#endif
#if MICROPY_VFS_FAT
return mp_fat_vfs_type.make_new(&mp_fat_vfs_type, 1, 0, &bdev_obj);
#endif
return bdev_obj;
}
mp_obj_t mp_vfs_mount(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
enum { ARG_readonly, ARG_mkfs };
static const mp_arg_t allowed_args[] = {
@ -178,10 +220,7 @@ mp_obj_t mp_vfs_mount(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args
if (dest[0] == MP_OBJ_NULL) {
// Input object has no mount method, assume it's a block device and try to
// auto-detect the filesystem and create the corresponding VFS entity.
// (At the moment we only support FAT filesystems.)
#if MICROPY_VFS_FAT
vfs_obj = mp_fat_vfs_type.make_new(&mp_fat_vfs_type, 1, 0, &vfs_obj);
#endif
vfs_obj = mp_vfs_autodetect(vfs_obj);
}
// create new object