jbd2: allocate transaction from separate slab cache
There is normally only a handful of these active at any one time, but putting them in a separate slab cache makes debugging memory corruption problems easier. Manish Katiyar also wanted this make it easier to test memory failure scenarios in the jbd2 layer. Cc: Manish Katiyar <mkatiyar@gmail.com> Signed-off-by: NYongqiang Yang <xiaoqiangnk@gmail.com> Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
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