Commit 8b107f5b authored by Jaegeuk Kim's avatar Jaegeuk Kim
Browse files

f2fs: avoid to issue redundant discard commands

If segs_per_sec is over 1 like under SMR, previously f2fs issues discard
commands redundantly on the same section, since we didn't move end position
for the previous discard command.


                       start  end
                         |    |
      prefree_bitmap = [01111100111100]

And, after issue discard for this section,
                             end      start
                              |        |
      prefree_bitmap = [01111100111100]

Select this section again by searching from (end + 1),
                             start  end
                                |   |
      prefree_bitmap = [01111100111100]

Fixes: 36abef4e

 ("f2fs: introduce mode=lfs mount option")
Cc: <>
Cc: Damien Le Moal <>
Signed-off-by: default avatarJaegeuk Kim <>
parent 37e79cd3
......@@ -1036,6 +1036,8 @@ void clear_prefree_segments(struct f2fs_sb_info *sbi, struct cp_control *cpc)
start = start_segno + sbi->segs_per_sec;
if (start < end)
goto next;
end = start - 1;
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