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authorJoe Thornber <ejt@redhat.com>2015-11-19 13:50:32 +0000
committerMike Snitzer <snitzer@redhat.com>2016-11-14 15:17:47 -0500
commit2e8ed71102ff8fe3919dd3a2d73ac4da72686efc (patch)
tree517679ff39a4d5c3901976181cf41c76e55be3fe /drivers/md/Kconfig
parenta25f0944ba9b1d8a6813fd6f1a86f1bd59ac25a6 (diff)
downloadlinux-2e8ed71102ff8fe3919dd3a2d73ac4da72686efc.tar.bz2
dm block manager: make block locking optional
The block manager's locking is useful for catching cycles that may result from certain btree metadata corruption. But in general it serves as a developer tool to catch bugs in code. Unless you're finding that DM thin provisioning is hanging due to infinite loops within the block manager's access to btree nodes you can safely disable this feature. Signed-off-by: Joe Thornber <ejt@redhat.com> Signed-off-by: Arnd Bergmann <arnd@arndb.de> # do/while(0) macro fix Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md/Kconfig')
-rw-r--r--drivers/md/Kconfig10
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/md/Kconfig b/drivers/md/Kconfig
index 02a5345a44a6..b7767da50c26 100644
--- a/drivers/md/Kconfig
+++ b/drivers/md/Kconfig
@@ -240,9 +240,17 @@ config DM_BUFIO
as a cache, holding recently-read blocks in memory and performing
delayed writes.
+config DM_DEBUG_BLOCK_MANAGER_LOCKING
+ bool "Block manager locking"
+ depends on DM_BUFIO
+ ---help---
+ Block manager locking can catch various metadata corruption issues.
+
+ If unsure, say N.
+
config DM_DEBUG_BLOCK_STACK_TRACING
bool "Keep stack trace of persistent data block lock holders"
- depends on STACKTRACE_SUPPORT && DM_BUFIO
+ depends on STACKTRACE_SUPPORT && DM_DEBUG_BLOCK_MANAGER_LOCKING
select STACKTRACE
---help---
Enable this for messages that may help debug problems with the