f2fs: avoid to issue redundant discard commands
commit8b107f5b97
upstream. 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. E.g., 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:36abef4e79
("f2fs: introduce mode=lfs mount option") Cc: Damien Le Moal <damien.lemoal@wdc.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -813,6 +813,8 @@ next:
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start = start_segno + sbi->segs_per_sec;
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if (start < end)
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goto next;
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else
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end = start - 1;
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}
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mutex_unlock(&dirty_i->seglist_lock);
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