Commit 95dd8973 authored Sep 17, 2014 by Jaegeuk Kim

f2fs: use more free segments until SSR is activated



Previously, f2fs activates SSR if the # of free segments reaches to the # of
overprovisioned segments.
In this case, SSR starts to use dirty segments only, so that the overprovisoned
space cannot be selected for new data.
This means that we have no chance to utilizae the overprovisioned space at all.

This patch fixes that by allowing LFS allocations until the # of free segments
reaches to the last threshold, reserved space.

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

parent 9b5f136f

fs/f2fs/segment.h

+4 −2

Original line number	Diff line number	Diff line
		@@ -437,8 +437,10 @@ static inline int reserved_sections(struct f2fs_sb_info *sbi)

		static inline bool need_SSR(struct f2fs_sb_info *sbi)
		{
		return (prefree_segments(sbi) / sbi->segs_per_sec)
		+ free_sections(sbi) < overprovision_sections(sbi);
		int node_secs = get_blocktype_secs(sbi, F2FS_DIRTY_NODES);
		int dent_secs = get_blocktype_secs(sbi, F2FS_DIRTY_DENTS);
		return free_sections(sbi) <= (node_secs + 2 * dent_secs +
		reserved_sections(sbi) + 1);
		}

		static inline bool has_not_enough_free_secs(struct f2fs_sb_info *sbi, int freed)