This patch stop discard thread to issue discard io if
something wrong with f2fs, which is similar to fstrim.

v1->v2: add fs error check in not only discard thread but also umount process

Signed-off-by: Yunlei He <heyun...@huawei.com>
---
 fs/f2fs/segment.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 5854cc4..7f45cc4 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -1202,6 +1202,12 @@ static int __issue_discard_cmd(struct f2fs_sb_info *sbi,
        int i, iter = 0, issued = 0;
        bool io_interrupted = false;
 
+       if (is_sbi_flag_set(sbi, SBI_NEED_FSCK)) {
+               f2fs_msg(sbi->sb, KERN_WARNING,
+                       "Found FS corruption, run fsck to fix.");
+               return issued;
+       }
+
        for (i = MAX_PLIST_NUM - 1; i >= 0; i--) {
                if (i + 1 < dpolicy->granularity)
                        break;
@@ -1410,7 +1416,6 @@ static int issue_discard_thread(void *data)
                        continue;
                if (kthread_should_stop())
                        return 0;
-
                if (dcc->discard_wake)
                        dcc->discard_wake = 0;
 
-- 
1.9.1


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