f2fs: fix f2fs_write_meta_page at no checkpoint status

If f2fs entered errorneous checkpoint status, it should skip writing meta
pages instead of redirtying the pages out.
Otherwise, it cannot unmount the partition even though f2fs is under read-only
status.

Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>

2 files changed, 23 insertions, 8 deletions

diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
index 293d048..8f5dff1 100644
--- a/fs/f2fs/checkpoint.c
+++ b/fs/f2fs/checkpoint.c
@@ -81,17 +81,18 @@ static int f2fs_write_meta_page(struct page *page,
 	struct inode *inode = page->mapping->host;
 	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 
-	/* Should not write any meta pages, if any IO error was occurred */
-	if (unlikely(sbi->por_doing ||
-			is_set_ckpt_flags(F2FS_CKPT(sbi), CP_ERROR_FLAG)))
+	if (unlikely(sbi->por_doing))
 		goto redirty_out;
-
 	if (wbc->for_reclaim)
 		goto redirty_out;
 
-	wait_on_page_writeback(page);
+	/* Should not write any meta pages, if any IO error was occurred */
+	if (unlikely(is_set_ckpt_flags(F2FS_CKPT(sbi), CP_ERROR_FLAG)))
+		goto no_write;
 
+	wait_on_page_writeback(page);
 	write_meta_page(sbi, page);
+no_write:
 	dec_page_count(sbi, F2FS_DIRTY_META);
 	unlock_page(page);
 	return 0;
@@ -148,10 +149,22 @@ long sync_meta_pages(struct f2fs_sb_info *sbi, enum page_type type,
 
 		for (i = 0; i < nr_pages; i++) {
 			struct page *page = pvec.pages[i];
+
 			lock_page(page);
-			f2fs_bug_on(page->mapping != mapping);
-			f2fs_bug_on(!PageDirty(page));
-			clear_page_dirty_for_io(page);
+
+			if (unlikely(page->mapping != mapping)) {
+continue_unlock:
+				unlock_page(page);
+				continue;
+			}
+			if (!PageDirty(page)) {
+				/* someone wrote it for us */
+				goto continue_unlock;
+			}
+
+			if (!clear_page_dirty_for_io(page))
+				goto continue_unlock;
+
 			if (f2fs_write_meta_page(page, &wbc)) {
 				unlock_page(page);
 				break;
diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index ea0371e..b0f5762 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -701,6 +701,8 @@ int f2fs_gc(struct f2fs_sb_info *sbi)
 gc_more:
 	if (unlikely(!(sbi->sb->s_flags & MS_ACTIVE)))
 		goto stop;
+	if (unlikely(is_set_ckpt_flags(F2FS_CKPT(sbi), CP_ERROR_FLAG)))
+		goto stop;
 
 	if (gc_type == BG_GC && has_not_enough_free_secs(sbi, nfree)) {
 		gc_type = FG_GC;