fs: use mapping_set_error instead of opencoded set_bit

The mapping_set_error() helper sets the correct AS_ flag for the mapping
so there is no reason to open code it.  Use the helper directly.

[akpm@linux-foundation.org: be honest about conversion from -ENXIO to -EIO]
Link: http://lkml.kernel.org/r/20160912111608.2588-2-mhocko@kernel.org
Signed-off-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/fs/buffer.c b/fs/buffer.c
index 7dad8713fac8..b205a629001d 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -351,7 +351,7 @@ void end_buffer_async_write(struct buffer_head *bh, int uptodate)
                 set_buffer_uptodate(bh);
         } else {
                 buffer_io_error(bh, ", lost async page write");
-                set_bit(AS_EIO, &page->mapping->flags);
+                mapping_set_error(page->mapping, -EIO);
                 set_buffer_write_io_error(bh);
                 clear_buffer_uptodate(bh);
                 SetPageError(page);
@@ -3249,7 +3249,7 @@ drop_buffers(struct page *page, struct buffer_head **buffers_to_free)
         bh = head;
         do {
                 if (buffer_write_io_error(bh) && page->mapping)
-                        set_bit(AS_EIO, &page->mapping->flags);
+                        mapping_set_error(page->mapping, -EIO);
                 if (buffer_busy(bh))
                         goto failed;
                 bh = bh->b_this_page;