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77 lines
1.3 KiB
77 lines
1.3 KiB
#include <stddef.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <bitops.h>
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#include <flash.h>
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#include <macros.h>
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#include <fs/mufs.h>
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#include "dir.h"
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struct mufs_super {
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char magic[4];
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uint32_t nblocks;
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struct mufs_dtree root;
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} __attribute__((packed));
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struct mufs *mufs_mount(struct flash_dev *dev)
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{
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struct mufs_super super;
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struct mufs *fs;
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if (!dev)
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return NULL;
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if (flash_read(dev, 0, &super, sizeof super) == 0)
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return NULL;
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if (memcmp(super.magic, "mufs", 4) != 0)
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return NULL;
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if (!(fs = malloc(sizeof *fs)))
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return NULL;
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fs->dev = dev;
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fs->nblocks = super.nblocks;
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fs->log2_nentries = fs->dev->log2_block_size - ilog2(sizeof(uint32_t));
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fs->root.fs = fs;
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fs->root.va = offsetof(struct mufs_super, root);
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fs->root.file_size = super.root.file_size;
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fs->root.root = super.root.root;
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fs->root.depth = super.root.depth;
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return fs;
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}
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void mufs_unmount(struct mufs *fs)
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{
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if (!fs)
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return;
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if (fs->dev)
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flash_release(fs->dev);
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free(fs);
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}
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int mufs_format(struct flash_dev *dev)
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{
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struct mufs_super super;
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memcpy(super.magic, "mufs", 4);
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super.nblocks = flash_get_capacity(dev) >> dev->log2_block_size;
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super.root.file_size = 0;
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super.root.root = 0;
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super.root.depth = 0;
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if (flash_write(dev, 0, &super, sizeof super) == 0)
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return -1;
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return 0;
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}
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