mm: clear AS_EIO/AS_ENOSPC when writeback initiation fails

filemap_write_and_wait{_range} will return an error if writeback
initiation fails, but won't clear errors in the address_space. This is
particularly problematic on DAX, as filemap_fdatawrite* is
effectively synchronous there. Ensure that we clear the AS_EIO/AS_ENOSPC
flags when filemap_fdatawrite* returns an error.

Signed-off-by: Jeff Layton <jlayton@redhat.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/mm/filemap.c b/mm/filemap.c
index e5711b2728f4..49bc9720fb00 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -515,6 +515,9 @@ int filemap_write_and_wait(struct address_space *mapping)
                         int err2 = filemap_fdatawait(mapping);
                         if (!err)
                                 err = err2;
+                } else {
+                        /* Clear any previously stored errors */
+                        filemap_check_errors(mapping);
                 }
         } else {
                 err = filemap_check_errors(mapping);
@@ -549,6 +552,9 @@ int filemap_write_and_wait_range(struct address_space *mapping,
                                                 lstart, lend);
                         if (!err)
                                 err = err2;
+                } else {
+                        /* Clear any previously stored errors */
+                        filemap_check_errors(mapping);
                 }
         } else {
                 err = filemap_check_errors(mapping);