From 36abef4e796d382e81a0c2d21ea5327481dd7154 Mon Sep 17 00:00:00 2001 From: Jaegeuk Kim Date: Fri, 3 Jun 2016 19:29:38 -0700 Subject: f2fs: introduce mode=lfs mount option This mount option is to enable original log-structured filesystem forcefully. So, there should be no random writes for main area. Especially, this supports host-managed SMR device. Signed-off-by: Jaegeuk Kim --- fs/f2fs/segment.c | 20 +++++++++++++++++++- 1 file changed, 19 insertions(+), 1 deletion(-) (limited to 'fs/f2fs/segment.c') diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c index eff046a792ad..4792f94089f7 100644 --- a/fs/f2fs/segment.c +++ b/fs/f2fs/segment.c @@ -707,6 +707,7 @@ void clear_prefree_segments(struct f2fs_sb_info *sbi, struct cp_control *cpc) struct dirty_seglist_info *dirty_i = DIRTY_I(sbi); unsigned long *prefree_map = dirty_i->dirty_segmap[PRE]; unsigned int start = 0, end = -1; + unsigned int secno, start_segno; mutex_lock(&dirty_i->seglist_lock); @@ -726,8 +727,22 @@ void clear_prefree_segments(struct f2fs_sb_info *sbi, struct cp_control *cpc) if (!test_opt(sbi, DISCARD)) continue; - f2fs_issue_discard(sbi, START_BLOCK(sbi, start), + if (!test_opt(sbi, LFS) || sbi->segs_per_sec == 1) { + f2fs_issue_discard(sbi, START_BLOCK(sbi, start), (end - start) << sbi->log_blocks_per_seg); + continue; + } +next: + secno = GET_SECNO(sbi, start); + start_segno = secno * sbi->segs_per_sec; + if (!IS_CURSEC(sbi, secno) && + !get_valid_blocks(sbi, start, sbi->segs_per_sec)) + f2fs_issue_discard(sbi, START_BLOCK(sbi, start_segno), + sbi->segs_per_sec << sbi->log_blocks_per_seg); + + start = start_segno + sbi->segs_per_sec; + if (start < end) + goto next; } mutex_unlock(&dirty_i->seglist_lock); @@ -1221,6 +1236,9 @@ void allocate_new_segments(struct f2fs_sb_info *sbi) { int i; + if (test_opt(sbi, LFS)) + return; + for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_DATA; i++) __allocate_new_segments(sbi, i); } -- cgit v1.2.3-59-g8ed1b