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Update LUKS2 locks for atomic operations.

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Atomic operation requires to hold a lock for longer period than
single metadata I/O. Update locks so that we can:

- lock a device more than once (lock ref counting)
- reaquire read lock on already held write lock (write lock
  is stronger than read lock)
This commit is contained in:
Ondrej Kozina
2019-02-13 18:22:32 +01:00
committed by Milan Broz
parent 3023f26911
commit 88b3924132
3 changed files with 105 additions and 54 deletions
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11
lib/utils_device_locking.h
View File

@@ -24,14 +24,19 @@
struct crypt_device;
struct crypt_lock_handle;
struct device;
int device_locked_readonly(struct crypt_lock_handle *h);
int device_locked(struct crypt_lock_handle *h);
struct crypt_lock_handle *device_read_lock_handle(struct crypt_device *cd, const char *device_path);
struct crypt_lock_handle *device_write_lock_handle(struct crypt_device *cd, const char *device_path);
void device_unlock_handle(struct crypt_device *cd, struct crypt_lock_handle *h);
int device_read_lock_internal(struct crypt_device *cd, struct device *device);
int device_write_lock_internal(struct crypt_device *cd, struct device *device);
void device_unlock_internal(struct crypt_device *cd, struct device *device);
int device_locked_verify(struct crypt_device *cd, int fd, struct crypt_lock_handle *h);
/* Used only in device internal allocation */
void device_set_lock_handle(struct device *device, struct crypt_lock_handle *h);
struct crypt_lock_handle *device_get_lock_handle(struct device *device);
#endif