tree 0c44eb0c27044a235cdf279016afc1e2d7800e7b
parent a0b30c12297eb63e9b994164f9c0937d29b9352d
author Theodore Ts'o <tytso@mit.edu> 1360445360 -0500
committer Theodore Ts'o <tytso@mit.edu> 1360445360 -0500

jbd2: use module parameters instead of debugfs for jbd_debug

There are multiple reasons to move away from debugfs.  First of all,
we are only using it for a single parameter, and it is much more
complicated to set up (some 30 lines of code compared to 3), and one
more thing that might fail while loading the jbd2 module.

Secondly, as a module paramter it can be specified as a boot option if
jbd2 is built into the kernel, or as a parameter when the module is
loaded, and it can also be manipulated dynamically under
/sys/module/jbd2/parameters/jbd2_debug.  So it is more flexible.

Ultimately we want to move away from using jbd_debug() towards
tracepoints, but for now this is still a useful simplification of the
code base.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>