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author	Jianpeng Ma <jianpeng.ma@intel.com>
	Thu, 13 Nov 2014 03:32:57 +0000 (11:32 +0800)
committer	Sage Weil <sage@redhat.com>
	Wed, 19 Nov 2014 00:16:53 +0000 (16:16 -0800)
commit	9f9eb6799e4fbdb20bb4dce9a15a560635d6af93
tree	7990338050e3aab4464679312b1591455758a126	tree \| snapshot
parent	ef2ff5f4761d89dfa3f45bea7246ad0065c877fb	commit \| diff

FileJournal: Add ssd discard for journal which using ssd disk as journal.

Journal is like a ring buffer. After data wrote to media disk, journal
can overwrite. But for those data, ssd dont't know it's nouse and can
remove. So add discard to tell ssd to remove those data.
This maybe not increase the performance. But it can increase the
lifetime of ssd.

Signed-off-by: Jianpeng Ma <jianpeng.ma@intel.com>

src/common/blkdev.cc		diff \| blob \| history
src/common/blkdev.h		diff \| blob \| history
src/os/FileJournal.cc		diff \| blob \| history
src/os/FileJournal.h		diff \| blob \| history

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