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jbd2: Use tracepoints for history file
authorTheodore Ts'o <tytso@mit.edu>
Wed, 30 Sep 2009 04:32:06 +0000 (00:32 -0400)
committerTheodore Ts'o <tytso@mit.edu>
Wed, 30 Sep 2009 04:32:06 +0000 (00:32 -0400)
The /proc/fs/jbd2/<dev>/history was maintained manually; by using
tracepoints, we can get all of the existing functionality of the /proc
file plus extra capabilities thanks to the ftrace infrastructure.  We
save memory as a bonus.

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

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