|
hi, all
i am interested in facebook flashcache,which uses
device mapper to make ssd as a disk cache, i want to add some functions in it,
so i modify some codes. but when i use dm_io_async_bvec(1, &job->cache,
WRITE,bio->bi_io_vec,bio->bi_idx, io_callback, kcached_job) (the
params is all right)submit a bio.
it does not call the io_callback function. i use
systemtap to trace the function. the result like this:(sometimes is: enter
dm_io_async_bvec; enter submit_bio; enter generic_make_request,
generic_make_request return, submit_bio return, dm_io_async_bvec
return. sometimes is :enter dm_io_async_bvec; enter submit_bio;
enter generic_make_request, dm_io_async_bvec return)
it do not know why, and why it did not call the
io_callback.
thanks.
2011-12-01
wzpywzh |
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