[PATCH 0/4] EXT4 trim bug fixes and improvement.

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Hi Ted and the list,
    Here are 4 patches for trim support in ext4.
Patch 1/4 is a fix for the 'len' overflow. As we have decided that we don't adjust start to s_first_data_block, this patch is still needed.
    Patch 2/4 is a speedup for trim in one group.
    Patch 3/4 adds trace points for the functions used in FITRIM.
Patch 4/4 is a speedup for trim in the whole volume. For more details, please check the commit log.

Regards,
Tao
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