Btrfs: add config option to enable btrfs integrity check

Added the BTRFS_FS_CHECK_INTEGRITY option to Kconfig. It depends on
BTRFS_FS.

Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>

1 files changed, 19 insertions, 0 deletions

diff --git a/fs/btrfs/Kconfig b/fs/btrfs/Kconfig
index ecb9fd3be143..d33f01c08b60 100644
--- a/fs/btrfs/Kconfig
+++ b/fs/btrfs/Kconfig
@@ -31,3 +31,22 @@ config BTRFS_FS_POSIX_ACL
           Linux website <http://acl.bestbits.at/>.
 
           If you don't know what Access Control Lists are, say N
+
+config BTRFS_FS_CHECK_INTEGRITY
+        bool "Btrfs with integrity check tool compiled in (DANGEROUS)"
+        depends on BTRFS_FS
+        help
+          Adds code that examines all block write requests (including
+          writes of the super block). The goal is to verify that the
+          state of the filesystem on disk is always consistent, i.e.,
+          after a power-loss or kernel panic event the filesystem is
+          in a consistent state.
+
+          If the integrity check tool is included and activated in
+          the mount options, plenty of kernel memory is used, and
+          plenty of additional CPU cycles are spent. Enabling this
+          functionality is not intended for normal use.
+
+          In most cases, unless you are a btrfs developer who needs
+          to verify the integrity of (super)-block write requests
+          during the run of a regression test, say N