From: Jaegeuk Kim <jaegeuk@kernel.org>
Date: Fri, 1 May 2015 05:37:50 +0000 (-0700)
Subject: f2fs: introduce discard_map for f2fs_trim_fs
X-Git-Tag: omap-for-v4.3/legacy-v2-signed~156^2~61
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a66cdd985532e69999b79249cd3b4a6bccd0f84b;p=pandora-kernel.git

f2fs: introduce discard_map for f2fs_trim_fs

This patch adds a bitmap for discard issues from f2fs_trim_fs.
There-in rule is to issue discard commands only for invalidated blocks
after mount.
Once mount is done, f2fs_trim_fs trims out whole invalid area.
After ehn, it will not issue and discrads redundantly.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
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