fsck.f2fs: Add progression feedback

On large SSDs filled with lots of data, fsck.f2fs can be very long to finish.
For instance, on my 1TB SSD filled at 99%, it takes literally 5 minutes to
complete.

Currently, the only way to have some feedback is to enable debug output,
but it is very verbose and doesn't tell the actual progress.

This patch implements a simple progress report in the longest
running part of the check (in fsck_chk_node_blk).
The number of checked node / total valid nodes is printed
every 1000 nodes checked, and the percentage of progress
is also calculated and printed.

Signed-off-by: Antoine Viallon <antoine@lesviallon.fr>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fsck/fsck.c

@@ -493,8 +493,23 @@ static int sanity_check_nid(struct f2fs_sb_info *sbi, u32 nid,
 				ni->blk_addr);
 
 	if (f2fs_test_main_bitmap(sbi, ni->blk_addr) == 0) {
+
 		fsck->chk.valid_blk_cnt++;
 		fsck->chk.valid_node_cnt++;
+
+		/* Progress report */
+		if (sbi->total_valid_node_count > 1000) {
+			unsigned int p10 = sbi->total_valid_node_count / 10;
+
+			if (sbi->fsck->chk.checked_node_cnt++ % p10)
+				return 0;
+
+			printf("[FSCK] Check node %"PRIu64" / %u (%.2f%%)\n",
+				sbi->fsck->chk.checked_node_cnt,
+				sbi->total_valid_node_count,
+				10 * (float)sbi->fsck->chk.checked_node_cnt /
+				p10);
+		}
 	}
 	return 0;
 }

fsck/fsck.h

@@ -91,6 +91,7 @@ struct f2fs_fsck {
 
 	struct orphan_info orphani;
 	struct chk_result {
+		u64 checked_node_cnt;
 		u64 valid_blk_cnt;
 		u32 valid_nat_entry_cnt;
 		u32 valid_node_cnt;