ext4: Add a stub for mpage_da_data in the trace header
The tracepoint ext4_da_write_pages has a struct mpage_da_data* parameter, but that struct is only defined in fs/ext4/ext4.h. This patch adds a forward declaration for that struct, so this tracepoint header can still be used by tools like SystemTap. This is a continuation of the fix in commit 3661d286. http://sourceware.org/bugzilla/show_bug.cgi?id=10703Signed-off-by: Josh Stone <jistone@redhat.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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