[PATCH] f2fs: fix to bail out in get_new_segment()

[Chao Yu <chao@kernel.org>]

------------[ cut here ]------------
WARNING: CPU: 3 PID: 579 at fs/f2fs/segment.c:2832 new_curseg+0x5e8/0x6dc
pc : new_curseg+0x5e8/0x6dc
Call trace:
 new_curseg+0x5e8/0x6dc
 f2fs_allocate_data_block+0xa54/0xe28
 do_write_page+0x6c/0x194
 f2fs_do_write_node_page+0x38/0x78
 __write_node_page+0x248/0x6d4
 f2fs_sync_node_pages+0x524/0x72c
 f2fs_write_checkpoint+0x4bc/0x9b0
 __checkpoint_and_complete_reqs+0x80/0x244
 issue_checkpoint_thread+0x8c/0xec
 kthread+0x114/0x1bc
 ret_from_fork+0x10/0x20

get_new_segment() detects inconsistent status in between free_segmap
and free_secmap, let's record such error into super block, and bail
out get_new_segment() instead of continue using the segment.

Signed-off-by: Chao Yu <chao@kernel.org>
---
 fs/f2fs/segment.c       | 6 +++++-
 include/linux/f2fs_fs.h | 1 +
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 34382447f717..037d06d58fda 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -2842,7 +2842,11 @@ static int get_new_segment(struct f2fs_sb_info *sbi,
 	}
 got_it:
 	/* set it as dirty segment in free segmap */
-	f2fs_bug_on(sbi, test_bit(segno, free_i->free_segmap));
+	if (test_bit(segno, free_i->free_segmap)) {
+		ret = -EFSCORRUPTED;
+		f2fs_stop_checkpoint(sbi, false, STOP_CP_REASON_CORRUPTED_FREE_BITMAP);
+		goto out_unlock;
+	}
 
 	/* no free section in conventional device or conventional zone */
 	if (new_sec && pinning &&
diff --git a/include/linux/f2fs_fs.h b/include/linux/f2fs_fs.h
index c24f8bc01045..5206d63b3386 100644
--- a/include/linux/f2fs_fs.h
+++ b/include/linux/f2fs_fs.h
@@ -78,6 +78,7 @@ enum stop_cp_reason {
 	STOP_CP_REASON_UPDATE_INODE,
 	STOP_CP_REASON_FLUSH_FAIL,
 	STOP_CP_REASON_NO_SEGMENT,
+	STOP_CP_REASON_CORRUPTED_FREE_BITMAP,
 	STOP_CP_REASON_MAX,
 };
 
-- 
2.49.0