errseq_check_and_advance
err = errseq_check_and_advance(&mapping->wb_err, &sbi->s_bdev_wb_err);
errseq_check_and_advance(&sb->s_bdev->bd_mapping->wb_err,
ret2 = errseq_check_and_advance(&sb->s_wb_err, &fd_file(f)->f_sb_err);
int errseq_check_and_advance(errseq_t *eseq, errseq_t *since);
errseq_check_and_advance(&mapping->wb_err, &journal->j_fs_dev_wb_err);
EXPORT_SYMBOL(errseq_check_and_advance);
err = errseq_check_and_advance(&mapping->wb_err,