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 bool "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. 19