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Add implementation of device/file locking for metadata.

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To be used later.
This commit is contained in:
Milan Broz
2017-09-24 12:13:57 +02:00
parent a8347d2820
commit 5536b3a58d
14 changed files with 647 additions and 6 deletions
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10
lib/internal.h
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@@ -88,6 +88,7 @@ int device_alloc(struct device **device, const char *path);
int device_alloc_no_check(struct device **device, const char *path);
void device_free(struct device *device);
const char *device_path(const struct device *device);
const char *device_dm_name(const struct device *device);
const char *device_block_path(const struct device *device);
void device_topology_alignment(struct device *device,
unsigned long *required_alignment, /* bytes */
@@ -101,6 +102,13 @@ void device_disable_direct_io(struct device *device);
int device_is_identical(struct device *device1, struct device *device2);
int device_is_rotational(struct device *device);
size_t device_alignment(struct device *device);
int device_direct_io(struct device *device);
int device_open_locked(struct device *device, int flags);
int device_read_lock(struct crypt_device *cd, struct device *device);
int device_write_lock(struct crypt_device *cd, struct device *device);
void device_read_unlock(struct device *device);
void device_write_unlock(struct device *device);
enum devcheck { DEV_OK = 0, DEV_EXCL = 1, DEV_SHARED = 2 };
int device_check_access(struct crypt_device *cd,
@@ -152,6 +160,8 @@ int crypt_get_debug_level(void);
int crypt_memlock_inc(struct crypt_device *ctx);
int crypt_memlock_dec(struct crypt_device *ctx);
int crypt_metadata_locking_enabled(void);
int crypt_random_init(struct crypt_device *ctx);
int crypt_random_get(struct crypt_device *ctx, char *buf, size_t len, int quality);
void crypt_random_exit(void);