1config DM_PERSISTENT_DATA
 2       tristate
 3       depends on BLK_DEV_DM
 4       select LIBCRC32C
 5       select DM_BUFIO
 6       ---help---
 7	 Library providing immutable on-disk data structure support for
 8	 device-mapper targets such as the thin provisioning target.
 9
10config DM_DEBUG_BLOCK_STACK_TRACING
11       boolean "Keep stack trace of persistent data block lock holders"
12       depends on STACKTRACE_SUPPORT && DM_PERSISTENT_DATA
13       select STACKTRACE
14       ---help---
15	 Enable this for messages that may help debug problems with the
16	 block manager locking used by thin provisioning and caching.
17
18	 If unsure, say N.