From: Jaegeuk Kim <jaegeuk@kernel.org>
Date: Fri, 29 Jan 2016 16:57:59 +0000 (-0800)
Subject: f2fs: flush bios to handle cp_error in put_super
X-Git-Tag: v4.6-rc1~66^2~50
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=17c19120eb7fa94d95013243a8cced8cc9e107e1;p=linux.git

f2fs: flush bios to handle cp_error in put_super

Sometimes, if cp_error is set, there remains under-writeback pages, resulting in
kernel hang in put_super.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 58d9a5574bb0..9445a34b8d48 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -582,6 +582,13 @@ static void f2fs_put_super(struct super_block *sb)
 	f2fs_leave_shrinker(sbi);
 	mutex_unlock(&sbi->umount_mutex);
 
+	/* our cp_error case, we can wait for any writeback page */
+	if (get_pages(sbi, F2FS_WRITEBACK)) {
+		f2fs_submit_merged_bio(sbi, DATA, WRITE);
+		f2fs_submit_merged_bio(sbi, NODE, WRITE);
+		f2fs_submit_merged_bio(sbi, META, WRITE);
+	}
+
 	iput(sbi->node_inode);
 	iput(sbi->meta_inode);