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mufs: initial support for mounting/formatting

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This commit is contained in:
S.J.R. van Schaik 2017-05-19 18:58:42 +02:00
parent e131d77cf5
commit 19cd9d185f
2 changed files with 59 additions and 0 deletions
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12
include/fs/mufs.h Normal file
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#pragma once
struct flash_dev;
struct mufs {
struct flash_dev *dev;
uint32_t nblocks;
uint32_t root;
};
int mufs_mount(struct mufs *fs, struct flash_dev *dev);
int mufs_format(struct flash_dev *dev);

47
source/fs/mufs/super.c Normal file
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#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <flash.h>
#include <fs/mufs.h>
struct mufs_super {
char magic[4];
uint32_t nblocks;
uint32_t root;
} __attribute__((packed));
int mufs_mount(struct mufs *fs, struct flash_dev *dev)
{
struct mufs_super super;
if (!fs || !dev)
return -1;
if (flash_read(dev, 0, &super, sizeof super) == 0)
return -1;
if (memcmp(super.magic, "mufs", 4) != 0)
return -1;
fs->dev = dev;
fs->nblocks = super.nblocks;
fs->root = super.root;
return 0;
}
int mufs_format(struct flash_dev *dev)
{
struct mufs_super super;
memcpy(super.magic, "mufs", 4);
super.nblocks = flash_get_capacity(dev) >> dev->log2_block_size;
super.root = 0;
if (flash_write(dev, 0, &super, sizeof super) == 0)
return -1;
return 0;
}