staging: lustre: llite: ll_write_begin/end not passing on errors

Because of a implementation of generic_perform_write(), write(2)
may return 0 with no errno even if EDQUOT or ENOSPC actually
happened in it. This patch fixes the issue with setting a proper
errno to ci_result.

Signed-off-by: Hiroya Nozaki <nozaki.hiroya@jp.fujitsu.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-6732
Reviewed-on: http://review.whamcloud.com/15302
Reviewed-by: Bobi Jam <bobijam@hotmail.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/lustre/lustre/llite/rw26.c b/drivers/staging/lustre/lustre/llite/rw26.c
index ca45b44..c1b7409 100644 (file)
--- a/drivers/staging/lustre/lustre/llite/rw26.c
+++ b/drivers/staging/lustre/lustre/llite/rw26.c
@@ -478,6 +478,7 @@ static int ll_write_begin(struct file *file, struct address_space *mapping,
 
        lcc = ll_cl_find(file);
        if (!lcc) {
+               io = NULL;
                result = -EIO;
                goto out;
        }
@@ -558,6 +559,8 @@ out:
                        lu_ref_del(&page->cp_reference, "cl_io", io);
                        cl_page_put(env, page);
                }
+               if (io)
+                       io->ci_result = result;
        } else {
                *pagep = vmpage;
                *fsdata = lcc;
@@ -627,6 +630,8 @@ static int ll_write_end(struct file *file, struct address_space *mapping,
            file->f_flags & O_SYNC || IS_SYNC(file_inode(file)))
                result = vvp_io_write_commit(env, io);
 
+       if (result < 0)
+               io->ci_result = result;
        return result >= 0 ? copied : result;
 }