[PATCH v4 RESEND 2/2] buffer: record blockdev write errors in super_block that it backs

Jeff Layton
2020-04-14T12:04:44Z

From: Jeff Layton <jlayton@redhat.com>

When syncing out a block device (a'la __sync_blockdev), any error
encountered will only be recorded in the bd_inode's mapping. When the
blockdev contains a filesystem however, we'd like to also record the
error in the super_block that's stored there.

Make mark_buffer_write_io_error also record the error in the
corresponding super_block when a writeback error occurs and the block
device contains a mounted superblock.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
fs/buffer.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/fs/buffer.c b/fs/buffer.c
index f73276d746bb..a9d986d27fa1 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -1160,6 +1160,8 @@ void mark_buffer_write_io_error(struct buffer_head *bh)
mapping_set_error(bh->b_page->mapping, -EIO);
if (bh->b_assoc_map)
mapping_set_error(bh->b_assoc_map, -EIO);
+ if (bh->b_bdev->bd_super)
+ errseq_set(&bh->b_bdev->bd_super->s_wb_err, -EIO);
}
EXPORT_SYMBOL(mark_buffer_write_io_error);

--
2.25.2