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Add crypt_set_data_offset API function.

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The crypt_set_data_offset sets the data offset for LUKS and LUKS2 devices
to specified value in 512-byte sectors.

This value should replace alignment calculation in LUKS param structures.
This commit is contained in:
Milan Broz
2018-12-05 20:45:48 +01:00
parent a9d3f48372
commit 03edcd2bfd
11 changed files with 180 additions and 48 deletions
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21
lib/libcryptsetup.h
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@@ -148,8 +148,29 @@ void crypt_set_confirm_callback(struct crypt_device *cd,
* @param cd crypt device handle
* @param device path to device
*
* @returns 0 on success or negative errno value otherwise.
*/
int crypt_set_data_device(struct crypt_device *cd, const char *device);
/**
* Set data device offset in 512-byte sectors.
* Used for LUKS.
* This function is replacement for data alignment fields in LUKS param struct.
* If set to 0 (default), old behaviour is preserved.
* This value is reset on @link crypt_load @endlink.
*
* @param cd crypt device handle
* @param data_offset data offset in bytes
*
* @returns 0 on success or negative errno value otherwise.
*
* @note Data offset must be aligned to multiple of 8 (alignment to 4096-byte sectors)
* and must be big enough to accomodate the whole LUKS header with all keyslots.
* @note Data offset is enforced by this function, device topology
* information is no longer used after calling this function.
*/
int crypt_set_data_offset(struct crypt_device *cd, uint64_t data_offset);
/** @} */
/**