Add CONFIG_DM_DEBUG and DMDEBUG() macro. Signed-off-by: Bryn Reeves Signed-off-by: Alasdair G Kergon Index: linux-2.6.17/drivers/md/Kconfig =================================================================== --- linux-2.6.17.orig/drivers/md/Kconfig 2006-08-31 19:36:37.000000000 +0100 +++ linux-2.6.17/drivers/md/Kconfig 2006-08-31 19:36:37.000000000 +0100 @@ -213,6 +213,14 @@ config BLK_DEV_DM If unsure, say N. +config DM_DEBUG + boolean "Device mapper debugging support" + depends on BLK_DEV_DM && EXPERIMENTAL + ---help--- + Enable this for messages that may help debug device-mapper problems. + + If unsure, say N. + config DM_CRYPT tristate "Crypt target support" depends on BLK_DEV_DM && EXPERIMENTAL Index: linux-2.6.17/drivers/md/dm.h =================================================================== --- linux-2.6.17.orig/drivers/md/dm.h 2006-08-31 19:36:37.000000000 +0100 +++ linux-2.6.17/drivers/md/dm.h 2006-08-31 19:36:54.000000000 +0100 @@ -21,6 +21,11 @@ #define DMERR(f, arg...) printk(KERN_ERR DM_NAME ": " DM_MSG_PREFIX ": " f "\n", ## arg) #define DMWARN(f, arg...) printk(KERN_WARNING DM_NAME ": " DM_MSG_PREFIX ": " f "\n", ## arg) #define DMINFO(f, arg...) printk(KERN_INFO DM_NAME ": " DM_MSG_PREFIX ": " f "\n", ## arg) +#ifdef CONFIG_DM_DEBUG +# define DMDEBUG(f, arg...) printk(KERN_DEBUG DM_NAME ": " DM_MSG_PREFIX " DEBUG: " f "\n", ## arg) +#else +# define DMDEBUG(f, arg...) do {} while (0) +#endif #define DMEMIT(x...) sz += ((sz >= maxlen) ? \ 0 : scnprintf(result + sz, maxlen - sz, x))