[PATCH 2/2] f2fs: avoid garbage collecting already moved node blocks

Jaegeuk Kim
2015-08-14T23:10:06Z

If node blocks were already moved, we don't need to move them again.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---
fs/f2fs/gc.c | 10 ++++++++++
1 file changed, 10 insertions(+)

diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index 81de28d8..0a5d573 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -396,14 +396,18 @@ static void gc_node_segment(struct f2fs_sb_info *sbi,
{
bool initial = true;
struct f2fs_summary *entry;
+ block_t start_addr;
int off;

+ start_addr = START_BLOCK(sbi, segno);
+
next_step:
entry = sum;

for (off = 0; off < sbi->blocks_per_seg; off++, entry++) {
nid_t nid = le32_to_cpu(entry->nid);
struct page *node_page;
+ struct node_info ni;

/* stop BG_GC if there is not enough free sections. */
if (gc_type == BG_GC && has_not_enough_free_secs(sbi, 0))
@@ -426,6 +430,12 @@ next_step:
continue;
}

+ get_node_info(sbi, nid, &ni);
+ if (ni.blk_addr != start_addr + off) {
+ f2fs_put_page(node_page, 1);
+ continue;
+ }
+
/* set page dirty and write it */
if (gc_type == FG_GC) {
f2fs_wait_on_page_writeback(node_page, NODE);
--
2.1.1