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f2fs: add mount option for segment allocation policy

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This patch adds an mount option, "alloc_mode=%s" having two options, "default"
and "reuse".

In "alloc_mode=reuse" case, f2fs starts to allocate segments from 0'th segment
all the time to reassign segments. It'd be useful for small-sized eMMC parts.

Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim
2018-02-18 08:50:49 -08:00
parent 69babac019
commit 079396270b
4 changed files with 41 additions and 0 deletions
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5
fs/f2fs/segment.c
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@@ -2170,6 +2170,11 @@ static unsigned int __get_next_segno(struct f2fs_sb_info *sbi, int type)
if (SIT_I(sbi)->last_victim[ALLOC_NEXT])
return SIT_I(sbi)->last_victim[ALLOC_NEXT];
/* find segments from 0 to reuse freed segments */
if (sbi->alloc_mode == ALLOC_MODE_REUSE)
return 0;
return CURSEG_I(sbi, type)->segno;
}