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Redesign fs_dev, raw_dev, introducing device_partition and switch_fs.

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In theory, one could mount an encrypted FAT partition itself coming from a disk image, etc.
This commit is contained in:
TuxSH
2018-05-13 19:53:55 +02:00
parent 396a646fa3
commit 4f50d412f5
18 changed files with 878 additions and 674 deletions
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48
fusee/fusee-secondary/src/device_partition.h Normal file
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#ifndef FUSEE_DEVICE_PARTITION_H
#define FUSEE_DEVICE_PARTITION_H
#include <stddef.h>
#include <stdint.h>
#include <stdbool.h>
#define DEVPART_IV_MAX_SIZE 16
struct device_partition_t;
typedef int (*device_partition_initializer_t)(struct device_partition_t *devpart);
typedef void (*device_partition_finalizer_t)(struct device_partition_t *devpart);
/* Note: only random-access ciphers supporting in-place encryption/decryption are supported */
typedef int (*device_partition_cipher_t)(struct device_partition_t *devpart, uint64_t sector, uint64_t num_sectors);
typedef int (*device_partition_reader_t)(struct device_partition_t *devpart, void *dst, uint64_t sector, uint64_t num_sectors);
typedef int (*device_partition_writer_t)(struct device_partition_t *devpart, const void *src, uint64_t sector, uint64_t num_sectors);
typedef struct device_partition_t {
size_t sector_size; /* The size of a sector */
uint64_t start_sector; /* Offset in the parent device, in sectors. */
uint64_t num_sectors; /* Maximum size of the partition, in sectors (optional). */
device_partition_cipher_t read_cipher; /* Cipher for read operations. */
device_partition_cipher_t write_cipher; /* Cipher for write operations. */
uint64_t crypto_flags; /* Additional information for crypto, for conveniency. */
device_partition_initializer_t initializer; /* Initializer. */
device_partition_finalizer_t finalizer; /* Finalizer. */
device_partition_reader_t reader; /* Reader. */
device_partition_writer_t writer; /* Writer. */
void *device_struct; /* Pointer to struct for additional info. */
void *crypto_work_buffer; /* Work buffer for crypto. */
uint64_t crypto_work_buffer_num_sectors; /* Size of the crypto work buffer in sectors. */
uint8_t iv[DEVPART_IV_MAX_SIZE]; /* IV. */
bool initialized;
} device_partition_t;
int device_partition_read_data(device_partition_t *devpart, void *dst, uint64_t sector, uint64_t num_sectors);
int device_partition_write_data(device_partition_t *devpart, const void *src, uint64_t sector, uint64_t num_sectors);
#endif