ext4: annotate all meta data requeststracking-emmc-llct-20130308.0tracking-emmc-llct-20130220.0tracking-emmc-llct-20130219.0tracking-emmc-llct-20130217.0tracking-emmc-llct-20130211.0tracking-emmc-llct-20130210.0tracking-emmc-llct-20130208.0tracking-emmc-llct-20130206.0tracking-emmc-llct-20130204.0tracking-emmc-llct-20130123.0tracking-emmc-llct-20130121.1tracking-emmc-llct-20130121.0tracking-emmc-llct-20130115.0tracking-emmc-llct-20130114.0tracking-emmc-llct-20121211.0tracking-emmc-llct-20121210.0tracking-emmc-llct-20121206.0tracking-emmc-llct-20121205.0tracking-emmc-llct-20121201.0tracking-emmc-llct-20121120.1tracking-emmc-llct-20121120.0tracking-emmc-llct-20121119.0tracking-emmc-llct-20121113.0tracking-emmc-llct-20121106.0tracking-emmc-llct-20121101.1tracking-emmc-llct-20121101.0tracking-emmc-llct-20121031.0tracking-emmc-llct-20121012.0tracking-emmc-llct-20121009.0tracking-emmc-llct-20121008.0tracking-emmc-llct-20121006.0tracking-emmc-llct-20121004.0tracking-emmc-llct-20120924.0tracking-emmc-llct-20120917.0tracking-emmc-llct-20120911.0tracking-emmc-llct-20120910.0tracking-emmc-llct-20120907.1tracking-emmc-llct-20120907.0tracking-emmc-llct-20120903.0tracking-emmc-llct-20120822.0tracking-emmc-llct-20120821.0tracking-emmc-linux-linaro-core-3.7-20130103.0tracking-emmc-linux-linaro-core-3.6-20121220.0tracking-emmc-linux-linaro-core-3.6-20121123.0tracking-emmc-linux-linaro-core-3.6-20121107.0

Today, storage devices like eMMC has special features like data tagging
(introduced in MMC-4.5 version) in order to improve performance of some
specific writes. On MMC stack, data tagging is used for all writes which has
REQ_META flag set. On EXT4, however, currently REQ_META is set only for read.
This patch adds the capability mark a meta-data buffer with set_buffer_meta
during meta data write. During submit_bh, this information is used to set
REQ_META flag.

Signed-off-by: Saugata Das <saugata.das@linaro.org>

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