Btrfs: mark mapping with error flag to report errors to userspace

According to commit 865ffef3797da2cac85b3354b5b6050dc9660978
(fs: fix fsync() error reporting),
it's not stable to just check error pages because pages can be
truncated or invalidated, we should also mark mapping with error
flag so that a later fsync can catch the error.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: Chris Mason <clm@fb.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index fa31c8d2c095..a55580f4e611 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -2367,6 +2367,8 @@ int end_extent_writepage(struct page *page, int err, u64 start, u64 end)
         if (!uptodate) {
                 ClearPageUptodate(page);
                 SetPageError(page);
+                ret = ret < 0 ? ret : -EIO;
+                mapping_set_error(page->mapping, ret);
         }
         return 0;
 }