UBIFS: switch self-check knobs to debugfs

UBIFS has many built-in self-check functions which can be enabled using the
debug_chks module parameter or the corresponding sysfs file
(/sys/module/ubifs/parameters/debug_chks). However, this is not flexible enough
because it is not per-filesystem. This patch moves this to debugfs interfaces.

We already have debugfs support, so this patch just adds more debugfs files.
While looking at debugfs support I've noticed that it is racy WRT file-system
unmount, and added a TODO entry for that. This problem has been there for long
time and it is quite standard debugfs PITA. The plan is to fix this later.

This patch is simple, but it is large because it changes many places where we
check if a particular type of checks is enabled or disabled.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

1 files changed, 0 insertions, 26 deletions

diff --git a/Documentation/filesystems/ubifs.txt b/Documentation/filesystems/ubifs.txt
index 91ef07652cd..a0a61d2f389 100644
--- a/Documentation/filesystems/ubifs.txt
+++ b/Documentation/filesystems/ubifs.txt
@@ -111,32 +111,6 @@ The following is an example of the kernel boot arguments to attach mtd0
 to UBI and mount volume "rootfs":
 ubi.mtd=0 root=ubi0:rootfs rootfstype=ubifs
 
-
-Module Parameters for Debugging
-===============================
-
-When UBIFS has been compiled with debugging enabled, there are 2 module
-parameters that are available to control aspects of testing and debugging.
-
-debug_chks      Selects extra checks that UBIFS can do while running:
-
-                Check                                   Flag value
-
-                General checks                          1
-                Check the index                         2
-                Check orphan area                       8
-                Check LEB properties (lprops)           32
-                Check leaf nodes and inodes             64
-
-debug_tsts      Selects a mode of testing, as follows:
-
-                Test mode                               Flag value
-
-                Failure mode for recovery testing       4
-
-For example, set debug_chks to 3 to enable general and TNC checks.
-
-
 References
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