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- #ifndef DM_VERITY_H
- #define DM_VERITY_H
- #include <linux/dm-bufio.h>
- #include <linux/device-mapper.h>
- #include <linux/interrupt.h>
- #include <crypto/hash.h>
- #define DM_VERITY_MAX_LEVELS 63
- enum verity_mode {
- DM_VERITY_MODE_EIO,
- DM_VERITY_MODE_LOGGING,
- DM_VERITY_MODE_RESTART,
- DM_VERITY_MODE_PANIC
- };
- enum verity_block_type {
- DM_VERITY_BLOCK_TYPE_DATA,
- DM_VERITY_BLOCK_TYPE_METADATA
- };
- struct dm_verity_fec;
- struct dm_verity {
- struct dm_dev *data_dev;
- struct dm_dev *hash_dev;
- struct dm_target *ti;
- struct dm_bufio_client *bufio;
- char *alg_name;
- struct crypto_ahash *tfm;
- u8 *root_digest;
- u8 *salt;
- u8 *zero_digest;
- unsigned int salt_size;
- sector_t data_start;
- sector_t hash_start;
- sector_t data_blocks;
- sector_t hash_blocks;
- unsigned char data_dev_block_bits;
- unsigned char hash_dev_block_bits;
- unsigned char hash_per_block_bits;
- unsigned char levels;
- unsigned char version;
- bool hash_failed:1;
- bool use_tasklet:1;
- unsigned int digest_size;
- unsigned int ahash_reqsize;
- enum verity_mode mode;
- unsigned int corrupted_errs;
- struct workqueue_struct *verify_wq;
-
- sector_t hash_level_block[DM_VERITY_MAX_LEVELS];
- struct dm_verity_fec *fec;
- unsigned long *validated_blocks;
- char *signature_key_desc;
- };
- struct dm_verity_io {
- struct dm_verity *v;
-
- bio_end_io_t *orig_bi_end_io;
- sector_t block;
- unsigned int n_blocks;
- bool in_tasklet;
- struct bvec_iter iter;
- struct work_struct work;
- struct tasklet_struct tasklet;
-
- };
- static inline struct ahash_request *verity_io_hash_req(struct dm_verity *v,
- struct dm_verity_io *io)
- {
- return (struct ahash_request *)(io + 1);
- }
- static inline u8 *verity_io_real_digest(struct dm_verity *v,
- struct dm_verity_io *io)
- {
- return (u8 *)(io + 1) + v->ahash_reqsize;
- }
- static inline u8 *verity_io_want_digest(struct dm_verity *v,
- struct dm_verity_io *io)
- {
- return (u8 *)(io + 1) + v->ahash_reqsize + v->digest_size;
- }
- extern int verity_for_bv_block(struct dm_verity *v, struct dm_verity_io *io,
- struct bvec_iter *iter,
- int (*process)(struct dm_verity *v,
- struct dm_verity_io *io,
- u8 *data, size_t len));
- extern int verity_hash(struct dm_verity *v, struct ahash_request *req,
- const u8 *data, size_t len, u8 *digest, bool may_sleep);
- extern int verity_hash_for_block(struct dm_verity *v, struct dm_verity_io *io,
- sector_t block, u8 *digest, bool *is_zero);
- extern bool dm_is_verity_target(struct dm_target *ti);
- extern int dm_verity_get_mode(struct dm_target *ti);
- extern int dm_verity_get_root_digest(struct dm_target *ti, u8 **root_digest,
- unsigned int *digest_size);
- #endif
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